Commit | Line | Data |
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2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
4 | * operating system. INET is implemented using the BSD Socket | |
5 | * interface as the means of communication with the user level. | |
6 | * | |
7 | * ROUTE - implementation of the IP router. | |
8 | * | |
02c30a84 | 9 | * Authors: Ross Biro |
1da177e4 LT |
10 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
11 | * Alan Cox, <gw4pts@gw4pts.ampr.org> | |
12 | * Linus Torvalds, <Linus.Torvalds@helsinki.fi> | |
13 | * Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru> | |
14 | * | |
15 | * Fixes: | |
16 | * Alan Cox : Verify area fixes. | |
17 | * Alan Cox : cli() protects routing changes | |
18 | * Rui Oliveira : ICMP routing table updates | |
19 | * (rco@di.uminho.pt) Routing table insertion and update | |
20 | * Linus Torvalds : Rewrote bits to be sensible | |
21 | * Alan Cox : Added BSD route gw semantics | |
e905a9ed | 22 | * Alan Cox : Super /proc >4K |
1da177e4 | 23 | * Alan Cox : MTU in route table |
6b9c8f46 | 24 | * Alan Cox : MSS actually. Also added the window |
1da177e4 LT |
25 | * clamper. |
26 | * Sam Lantinga : Fixed route matching in rt_del() | |
27 | * Alan Cox : Routing cache support. | |
28 | * Alan Cox : Removed compatibility cruft. | |
29 | * Alan Cox : RTF_REJECT support. | |
30 | * Alan Cox : TCP irtt support. | |
31 | * Jonathan Naylor : Added Metric support. | |
32 | * Miquel van Smoorenburg : BSD API fixes. | |
33 | * Miquel van Smoorenburg : Metrics. | |
34 | * Alan Cox : Use __u32 properly | |
35 | * Alan Cox : Aligned routing errors more closely with BSD | |
36 | * our system is still very different. | |
37 | * Alan Cox : Faster /proc handling | |
38 | * Alexey Kuznetsov : Massive rework to support tree based routing, | |
39 | * routing caches and better behaviour. | |
e905a9ed | 40 | * |
1da177e4 LT |
41 | * Olaf Erb : irtt wasn't being copied right. |
42 | * Bjorn Ekwall : Kerneld route support. | |
43 | * Alan Cox : Multicast fixed (I hope) | |
6b9c8f46 | 44 | * Pavel Krauz : Limited broadcast fixed |
1da177e4 LT |
45 | * Mike McLagan : Routing by source |
46 | * Alexey Kuznetsov : End of old history. Split to fib.c and | |
47 | * route.c and rewritten from scratch. | |
48 | * Andi Kleen : Load-limit warning messages. | |
49 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. | |
50 | * Vitaly E. Lavrov : Race condition in ip_route_input_slow. | |
51 | * Tobias Ringstrom : Uninitialized res.type in ip_route_output_slow. | |
52 | * Vladimir V. Ivanov : IP rule info (flowid) is really useful. | |
53 | * Marc Boucher : routing by fwmark | |
54 | * Robert Olsson : Added rt_cache statistics | |
55 | * Arnaldo C. Melo : Convert proc stuff to seq_file | |
bb1d23b0 | 56 | * Eric Dumazet : hashed spinlocks and rt_check_expire() fixes. |
6b9c8f46 SK |
57 | * Ilia Sotnikov : Ignore TOS on PMTUD and Redirect |
58 | * Ilia Sotnikov : Removed TOS from hash calculations | |
1da177e4 LT |
59 | */ |
60 | ||
afd46503 JP |
61 | #define pr_fmt(fmt) "IPv4: " fmt |
62 | ||
1da177e4 | 63 | #include <linux/module.h> |
1da177e4 | 64 | #include <linux/bitops.h> |
1da177e4 | 65 | #include <linux/kernel.h> |
1da177e4 | 66 | #include <linux/mm.h> |
aa6dd211 | 67 | #include <linux/memblock.h> |
1da177e4 | 68 | #include <linux/socket.h> |
1da177e4 LT |
69 | #include <linux/errno.h> |
70 | #include <linux/in.h> | |
71 | #include <linux/inet.h> | |
72 | #include <linux/netdevice.h> | |
73 | #include <linux/proc_fs.h> | |
74 | #include <linux/init.h> | |
75 | #include <linux/skbuff.h> | |
1da177e4 LT |
76 | #include <linux/inetdevice.h> |
77 | #include <linux/igmp.h> | |
78 | #include <linux/pkt_sched.h> | |
79 | #include <linux/mroute.h> | |
80 | #include <linux/netfilter_ipv4.h> | |
81 | #include <linux/random.h> | |
1da177e4 | 82 | #include <linux/rcupdate.h> |
5a0e3ad6 | 83 | #include <linux/slab.h> |
73f156a6 | 84 | #include <linux/jhash.h> |
352e512c | 85 | #include <net/dst.h> |
1b7179d3 | 86 | #include <net/dst_metadata.h> |
32ccf110 | 87 | #include <net/inet_dscp.h> |
457c4cbc | 88 | #include <net/net_namespace.h> |
1da177e4 LT |
89 | #include <net/ip.h> |
90 | #include <net/route.h> | |
91 | #include <net/inetpeer.h> | |
92 | #include <net/sock.h> | |
93 | #include <net/ip_fib.h> | |
5481d73f | 94 | #include <net/nexthop.h> |
1da177e4 LT |
95 | #include <net/tcp.h> |
96 | #include <net/icmp.h> | |
97 | #include <net/xfrm.h> | |
571e7226 | 98 | #include <net/lwtunnel.h> |
8d71740c | 99 | #include <net/netevent.h> |
63f3444f | 100 | #include <net/rtnetlink.h> |
1da177e4 LT |
101 | #ifdef CONFIG_SYSCTL |
102 | #include <linux/sysctl.h> | |
103 | #endif | |
6e5714ea | 104 | #include <net/secure_seq.h> |
1b7179d3 | 105 | #include <net/ip_tunnels.h> |
1da177e4 | 106 | |
b6179813 RP |
107 | #include "fib_lookup.h" |
108 | ||
68a5e3dd | 109 | #define RT_FL_TOS(oldflp4) \ |
f61759e6 | 110 | ((oldflp4)->flowi4_tos & (IPTOS_RT_MASK | RTO_ONLINK)) |
1da177e4 | 111 | |
1da177e4 LT |
112 | #define RT_GC_TIMEOUT (300*HZ) |
113 | ||
1de6b15a | 114 | #define DEFAULT_MIN_PMTU (512 + 20 + 20) |
1135fad2 | 115 | #define DEFAULT_MTU_EXPIRES (10 * 60 * HZ) |
2e9589ff | 116 | #define DEFAULT_MIN_ADVMSS 256 |
1da177e4 | 117 | static int ip_rt_max_size; |
817bc4db SH |
118 | static int ip_rt_redirect_number __read_mostly = 9; |
119 | static int ip_rt_redirect_load __read_mostly = HZ / 50; | |
120 | static int ip_rt_redirect_silence __read_mostly = ((HZ / 50) << (9 + 1)); | |
121 | static int ip_rt_error_cost __read_mostly = HZ; | |
122 | static int ip_rt_error_burst __read_mostly = 5 * HZ; | |
9f28a2fc | 123 | |
deed49df | 124 | static int ip_rt_gc_timeout __read_mostly = RT_GC_TIMEOUT; |
c7272c2f | 125 | |
1da177e4 LT |
126 | /* |
127 | * Interface to generic destination cache. | |
128 | */ | |
129 | ||
bbd807df BV |
130 | INDIRECT_CALLABLE_SCOPE |
131 | struct dst_entry *ipv4_dst_check(struct dst_entry *dst, u32 cookie); | |
0dbaee3b | 132 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst); |
f67fbeae BV |
133 | INDIRECT_CALLABLE_SCOPE |
134 | unsigned int ipv4_mtu(const struct dst_entry *dst); | |
1da177e4 LT |
135 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst); |
136 | static void ipv4_link_failure(struct sk_buff *skb); | |
6700c270 | 137 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
138 | struct sk_buff *skb, u32 mtu, |
139 | bool confirm_neigh); | |
6700c270 DM |
140 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, |
141 | struct sk_buff *skb); | |
caacf05e | 142 | static void ipv4_dst_destroy(struct dst_entry *dst); |
1da177e4 | 143 | |
62fa8a84 DM |
144 | static u32 *ipv4_cow_metrics(struct dst_entry *dst, unsigned long old) |
145 | { | |
31248731 DM |
146 | WARN_ON(1); |
147 | return NULL; | |
62fa8a84 DM |
148 | } |
149 | ||
f894cbf8 DM |
150 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
151 | struct sk_buff *skb, | |
152 | const void *daddr); | |
63fca65d | 153 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr); |
d3aaeb38 | 154 | |
1da177e4 LT |
155 | static struct dst_ops ipv4_dst_ops = { |
156 | .family = AF_INET, | |
1da177e4 | 157 | .check = ipv4_dst_check, |
0dbaee3b | 158 | .default_advmss = ipv4_default_advmss, |
ebb762f2 | 159 | .mtu = ipv4_mtu, |
62fa8a84 | 160 | .cow_metrics = ipv4_cow_metrics, |
caacf05e | 161 | .destroy = ipv4_dst_destroy, |
1da177e4 LT |
162 | .negative_advice = ipv4_negative_advice, |
163 | .link_failure = ipv4_link_failure, | |
164 | .update_pmtu = ip_rt_update_pmtu, | |
e47a185b | 165 | .redirect = ip_do_redirect, |
b92dacd4 | 166 | .local_out = __ip_local_out, |
d3aaeb38 | 167 | .neigh_lookup = ipv4_neigh_lookup, |
63fca65d | 168 | .confirm_neigh = ipv4_confirm_neigh, |
1da177e4 LT |
169 | }; |
170 | ||
171 | #define ECN_OR_COST(class) TC_PRIO_##class | |
172 | ||
4839c52b | 173 | const __u8 ip_tos2prio[16] = { |
1da177e4 | 174 | TC_PRIO_BESTEFFORT, |
4a2b9c37 | 175 | ECN_OR_COST(BESTEFFORT), |
1da177e4 LT |
176 | TC_PRIO_BESTEFFORT, |
177 | ECN_OR_COST(BESTEFFORT), | |
178 | TC_PRIO_BULK, | |
179 | ECN_OR_COST(BULK), | |
180 | TC_PRIO_BULK, | |
181 | ECN_OR_COST(BULK), | |
182 | TC_PRIO_INTERACTIVE, | |
183 | ECN_OR_COST(INTERACTIVE), | |
184 | TC_PRIO_INTERACTIVE, | |
185 | ECN_OR_COST(INTERACTIVE), | |
186 | TC_PRIO_INTERACTIVE_BULK, | |
187 | ECN_OR_COST(INTERACTIVE_BULK), | |
188 | TC_PRIO_INTERACTIVE_BULK, | |
189 | ECN_OR_COST(INTERACTIVE_BULK) | |
190 | }; | |
d4a96865 | 191 | EXPORT_SYMBOL(ip_tos2prio); |
1da177e4 | 192 | |
2f970d83 | 193 | static DEFINE_PER_CPU(struct rt_cache_stat, rt_cache_stat); |
3ed66e91 | 194 | #define RT_CACHE_STAT_INC(field) raw_cpu_inc(rt_cache_stat.field) |
1da177e4 | 195 | |
1da177e4 | 196 | #ifdef CONFIG_PROC_FS |
1da177e4 LT |
197 | static void *rt_cache_seq_start(struct seq_file *seq, loff_t *pos) |
198 | { | |
29e75252 | 199 | if (*pos) |
89aef892 | 200 | return NULL; |
29e75252 | 201 | return SEQ_START_TOKEN; |
1da177e4 LT |
202 | } |
203 | ||
204 | static void *rt_cache_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
205 | { | |
1da177e4 | 206 | ++*pos; |
89aef892 | 207 | return NULL; |
1da177e4 LT |
208 | } |
209 | ||
210 | static void rt_cache_seq_stop(struct seq_file *seq, void *v) | |
211 | { | |
1da177e4 LT |
212 | } |
213 | ||
214 | static int rt_cache_seq_show(struct seq_file *seq, void *v) | |
215 | { | |
216 | if (v == SEQ_START_TOKEN) | |
217 | seq_printf(seq, "%-127s\n", | |
218 | "Iface\tDestination\tGateway \tFlags\t\tRefCnt\tUse\t" | |
219 | "Metric\tSource\t\tMTU\tWindow\tIRTT\tTOS\tHHRef\t" | |
220 | "HHUptod\tSpecDst"); | |
e905a9ed | 221 | return 0; |
1da177e4 LT |
222 | } |
223 | ||
f690808e | 224 | static const struct seq_operations rt_cache_seq_ops = { |
1da177e4 LT |
225 | .start = rt_cache_seq_start, |
226 | .next = rt_cache_seq_next, | |
227 | .stop = rt_cache_seq_stop, | |
228 | .show = rt_cache_seq_show, | |
229 | }; | |
230 | ||
1da177e4 LT |
231 | static void *rt_cpu_seq_start(struct seq_file *seq, loff_t *pos) |
232 | { | |
233 | int cpu; | |
234 | ||
235 | if (*pos == 0) | |
236 | return SEQ_START_TOKEN; | |
237 | ||
0f23174a | 238 | for (cpu = *pos-1; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
239 | if (!cpu_possible(cpu)) |
240 | continue; | |
241 | *pos = cpu+1; | |
2f970d83 | 242 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 LT |
243 | } |
244 | return NULL; | |
245 | } | |
246 | ||
247 | static void *rt_cpu_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
248 | { | |
249 | int cpu; | |
250 | ||
0f23174a | 251 | for (cpu = *pos; cpu < nr_cpu_ids; ++cpu) { |
1da177e4 LT |
252 | if (!cpu_possible(cpu)) |
253 | continue; | |
254 | *pos = cpu+1; | |
2f970d83 | 255 | return &per_cpu(rt_cache_stat, cpu); |
1da177e4 | 256 | } |
a3ea8673 | 257 | (*pos)++; |
1da177e4 | 258 | return NULL; |
e905a9ed | 259 | |
1da177e4 LT |
260 | } |
261 | ||
262 | static void rt_cpu_seq_stop(struct seq_file *seq, void *v) | |
263 | { | |
264 | ||
265 | } | |
266 | ||
267 | static int rt_cpu_seq_show(struct seq_file *seq, void *v) | |
268 | { | |
269 | struct rt_cache_stat *st = v; | |
270 | ||
271 | if (v == SEQ_START_TOKEN) { | |
0547ffe6 | 272 | seq_puts(seq, "entries in_hit in_slow_tot in_slow_mc in_no_route in_brd in_martian_dst in_martian_src out_hit out_slow_tot out_slow_mc gc_total gc_ignored gc_goal_miss gc_dst_overflow in_hlist_search out_hlist_search\n"); |
1da177e4 LT |
273 | return 0; |
274 | } | |
e905a9ed | 275 | |
0547ffe6 YD |
276 | seq_printf(seq, "%08x %08x %08x %08x %08x %08x %08x " |
277 | "%08x %08x %08x %08x %08x %08x " | |
278 | "%08x %08x %08x %08x\n", | |
fc66f95c | 279 | dst_entries_get_slow(&ipv4_dst_ops), |
0baf2b35 | 280 | 0, /* st->in_hit */ |
1da177e4 LT |
281 | st->in_slow_tot, |
282 | st->in_slow_mc, | |
283 | st->in_no_route, | |
284 | st->in_brd, | |
285 | st->in_martian_dst, | |
286 | st->in_martian_src, | |
287 | ||
0baf2b35 | 288 | 0, /* st->out_hit */ |
1da177e4 | 289 | st->out_slow_tot, |
e905a9ed | 290 | st->out_slow_mc, |
1da177e4 | 291 | |
0baf2b35 ED |
292 | 0, /* st->gc_total */ |
293 | 0, /* st->gc_ignored */ | |
294 | 0, /* st->gc_goal_miss */ | |
295 | 0, /* st->gc_dst_overflow */ | |
296 | 0, /* st->in_hlist_search */ | |
297 | 0 /* st->out_hlist_search */ | |
1da177e4 LT |
298 | ); |
299 | return 0; | |
300 | } | |
301 | ||
f690808e | 302 | static const struct seq_operations rt_cpu_seq_ops = { |
1da177e4 LT |
303 | .start = rt_cpu_seq_start, |
304 | .next = rt_cpu_seq_next, | |
305 | .stop = rt_cpu_seq_stop, | |
306 | .show = rt_cpu_seq_show, | |
307 | }; | |
308 | ||
c7066f70 | 309 | #ifdef CONFIG_IP_ROUTE_CLASSID |
a661c419 | 310 | static int rt_acct_proc_show(struct seq_file *m, void *v) |
78c686e9 | 311 | { |
a661c419 AD |
312 | struct ip_rt_acct *dst, *src; |
313 | unsigned int i, j; | |
314 | ||
315 | dst = kcalloc(256, sizeof(struct ip_rt_acct), GFP_KERNEL); | |
316 | if (!dst) | |
317 | return -ENOMEM; | |
318 | ||
319 | for_each_possible_cpu(i) { | |
320 | src = (struct ip_rt_acct *)per_cpu_ptr(ip_rt_acct, i); | |
321 | for (j = 0; j < 256; j++) { | |
322 | dst[j].o_bytes += src[j].o_bytes; | |
323 | dst[j].o_packets += src[j].o_packets; | |
324 | dst[j].i_bytes += src[j].i_bytes; | |
325 | dst[j].i_packets += src[j].i_packets; | |
326 | } | |
78c686e9 PE |
327 | } |
328 | ||
a661c419 AD |
329 | seq_write(m, dst, 256 * sizeof(struct ip_rt_acct)); |
330 | kfree(dst); | |
331 | return 0; | |
332 | } | |
78c686e9 | 333 | #endif |
107f1634 | 334 | |
73b38711 | 335 | static int __net_init ip_rt_do_proc_init(struct net *net) |
107f1634 PE |
336 | { |
337 | struct proc_dir_entry *pde; | |
338 | ||
f105f26e YD |
339 | pde = proc_create_seq("rt_cache", 0444, net->proc_net, |
340 | &rt_cache_seq_ops); | |
107f1634 PE |
341 | if (!pde) |
342 | goto err1; | |
343 | ||
f105f26e YD |
344 | pde = proc_create_seq("rt_cache", 0444, net->proc_net_stat, |
345 | &rt_cpu_seq_ops); | |
107f1634 PE |
346 | if (!pde) |
347 | goto err2; | |
348 | ||
c7066f70 | 349 | #ifdef CONFIG_IP_ROUTE_CLASSID |
3f3942ac CH |
350 | pde = proc_create_single("rt_acct", 0, net->proc_net, |
351 | rt_acct_proc_show); | |
107f1634 PE |
352 | if (!pde) |
353 | goto err3; | |
354 | #endif | |
355 | return 0; | |
356 | ||
c7066f70 | 357 | #ifdef CONFIG_IP_ROUTE_CLASSID |
107f1634 PE |
358 | err3: |
359 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
360 | #endif | |
361 | err2: | |
362 | remove_proc_entry("rt_cache", net->proc_net); | |
363 | err1: | |
364 | return -ENOMEM; | |
365 | } | |
73b38711 DL |
366 | |
367 | static void __net_exit ip_rt_do_proc_exit(struct net *net) | |
368 | { | |
369 | remove_proc_entry("rt_cache", net->proc_net_stat); | |
370 | remove_proc_entry("rt_cache", net->proc_net); | |
c7066f70 | 371 | #ifdef CONFIG_IP_ROUTE_CLASSID |
73b38711 | 372 | remove_proc_entry("rt_acct", net->proc_net); |
0a931acf | 373 | #endif |
73b38711 DL |
374 | } |
375 | ||
376 | static struct pernet_operations ip_rt_proc_ops __net_initdata = { | |
377 | .init = ip_rt_do_proc_init, | |
378 | .exit = ip_rt_do_proc_exit, | |
379 | }; | |
380 | ||
381 | static int __init ip_rt_proc_init(void) | |
382 | { | |
383 | return register_pernet_subsys(&ip_rt_proc_ops); | |
384 | } | |
385 | ||
107f1634 | 386 | #else |
73b38711 | 387 | static inline int ip_rt_proc_init(void) |
107f1634 PE |
388 | { |
389 | return 0; | |
390 | } | |
1da177e4 | 391 | #endif /* CONFIG_PROC_FS */ |
e905a9ed | 392 | |
4331debc | 393 | static inline bool rt_is_expired(const struct rtable *rth) |
e84f84f2 | 394 | { |
ca4c3fc2 | 395 | return rth->rt_genid != rt_genid_ipv4(dev_net(rth->dst.dev)); |
e84f84f2 DL |
396 | } |
397 | ||
4ccfe6d4 | 398 | void rt_cache_flush(struct net *net) |
1da177e4 | 399 | { |
ca4c3fc2 | 400 | rt_genid_bump_ipv4(net); |
98376387 ED |
401 | } |
402 | ||
f894cbf8 DM |
403 | static struct neighbour *ipv4_neigh_lookup(const struct dst_entry *dst, |
404 | struct sk_buff *skb, | |
405 | const void *daddr) | |
3769cffb | 406 | { |
1550c171 | 407 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
d3aaeb38 | 408 | struct net_device *dev = dst->dev; |
3769cffb DM |
409 | struct neighbour *n; |
410 | ||
09eed119 | 411 | rcu_read_lock(); |
5c9f7c1d DA |
412 | |
413 | if (likely(rt->rt_gw_family == AF_INET)) { | |
414 | n = ip_neigh_gw4(dev, rt->rt_gw4); | |
415 | } else if (rt->rt_gw_family == AF_INET6) { | |
416 | n = ip_neigh_gw6(dev, &rt->rt_gw6); | |
417 | } else { | |
418 | __be32 pkey; | |
419 | ||
420 | pkey = skb ? ip_hdr(skb)->daddr : *((__be32 *) daddr); | |
421 | n = ip_neigh_gw4(dev, pkey); | |
422 | } | |
423 | ||
537de0c8 | 424 | if (!IS_ERR(n) && !refcount_inc_not_zero(&n->refcnt)) |
5c9f7c1d DA |
425 | n = NULL; |
426 | ||
09eed119 | 427 | rcu_read_unlock(); |
5c9f7c1d DA |
428 | |
429 | return n; | |
d3aaeb38 DM |
430 | } |
431 | ||
63fca65d JA |
432 | static void ipv4_confirm_neigh(const struct dst_entry *dst, const void *daddr) |
433 | { | |
1550c171 | 434 | const struct rtable *rt = container_of(dst, struct rtable, dst); |
63fca65d JA |
435 | struct net_device *dev = dst->dev; |
436 | const __be32 *pkey = daddr; | |
63fca65d | 437 | |
6de9c055 | 438 | if (rt->rt_gw_family == AF_INET) { |
1550c171 | 439 | pkey = (const __be32 *)&rt->rt_gw4; |
6de9c055 DA |
440 | } else if (rt->rt_gw_family == AF_INET6) { |
441 | return __ipv6_confirm_neigh_stub(dev, &rt->rt_gw6); | |
442 | } else if (!daddr || | |
63fca65d | 443 | (rt->rt_flags & |
6de9c055 | 444 | (RTCF_MULTICAST | RTCF_BROADCAST | RTCF_LOCAL))) { |
63fca65d | 445 | return; |
6de9c055 | 446 | } |
63fca65d JA |
447 | __ipv4_confirm_neigh(dev, *(__force u32 *)pkey); |
448 | } | |
449 | ||
aa6dd211 ED |
450 | /* Hash tables of size 2048..262144 depending on RAM size. |
451 | * Each bucket uses 8 bytes. | |
452 | */ | |
453 | static u32 ip_idents_mask __read_mostly; | |
355b590c ED |
454 | static atomic_t *ip_idents __read_mostly; |
455 | static u32 *ip_tstamps __read_mostly; | |
04ca6973 ED |
456 | |
457 | /* In order to protect privacy, we add a perturbation to identifiers | |
458 | * if one generator is seldom used. This makes hard for an attacker | |
459 | * to infer how many packets were sent between two points in time. | |
460 | */ | |
47ed9442 | 461 | static u32 ip_idents_reserve(u32 hash, int segs) |
04ca6973 | 462 | { |
aa6dd211 ED |
463 | u32 bucket, old, now = (u32)jiffies; |
464 | atomic_t *p_id; | |
465 | u32 *p_tstamp; | |
a6211caa | 466 | u32 delta = 0; |
04ca6973 | 467 | |
aa6dd211 ED |
468 | bucket = hash & ip_idents_mask; |
469 | p_tstamp = ip_tstamps + bucket; | |
470 | p_id = ip_idents + bucket; | |
471 | old = READ_ONCE(*p_tstamp); | |
472 | ||
355b590c | 473 | if (old != now && cmpxchg(p_tstamp, old, now) == old) |
8032bf12 | 474 | delta = get_random_u32_below(now - old); |
04ca6973 | 475 | |
a6211caa YJ |
476 | /* If UBSAN reports an error there, please make sure your compiler |
477 | * supports -fno-strict-overflow before reporting it that was a bug | |
478 | * in UBSAN, and it has been fixed in GCC-8. | |
479 | */ | |
480 | return atomic_add_return(segs + delta, p_id) - segs; | |
04ca6973 | 481 | } |
1da177e4 | 482 | |
b6a7719a | 483 | void __ip_select_ident(struct net *net, struct iphdr *iph, int segs) |
1da177e4 | 484 | { |
73f156a6 | 485 | u32 hash, id; |
1da177e4 | 486 | |
df453700 ED |
487 | /* Note the following code is not safe, but this is okay. */ |
488 | if (unlikely(siphash_key_is_zero(&net->ipv4.ip_id_key))) | |
489 | get_random_bytes(&net->ipv4.ip_id_key, | |
490 | sizeof(net->ipv4.ip_id_key)); | |
1da177e4 | 491 | |
df453700 | 492 | hash = siphash_3u32((__force u32)iph->daddr, |
04ca6973 | 493 | (__force u32)iph->saddr, |
df453700 ED |
494 | iph->protocol, |
495 | &net->ipv4.ip_id_key); | |
73f156a6 ED |
496 | id = ip_idents_reserve(hash, segs); |
497 | iph->id = htons(id); | |
1da177e4 | 498 | } |
4bc2f18b | 499 | EXPORT_SYMBOL(__ip_select_ident); |
1da177e4 | 500 | |
544b4dd5 GN |
501 | static void ip_rt_fix_tos(struct flowi4 *fl4) |
502 | { | |
503 | __u8 tos = RT_FL_TOS(fl4); | |
504 | ||
505 | fl4->flowi4_tos = tos & IPTOS_RT_MASK; | |
16a28267 GN |
506 | if (tos & RTO_ONLINK) |
507 | fl4->flowi4_scope = RT_SCOPE_LINK; | |
544b4dd5 GN |
508 | } |
509 | ||
e2d118a1 | 510 | static void __build_flow_key(const struct net *net, struct flowi4 *fl4, |
b1ad4138 GN |
511 | const struct sock *sk, const struct iphdr *iph, |
512 | int oif, __u8 tos, u8 prot, u32 mark, | |
513 | int flow_flags) | |
4895c771 | 514 | { |
b1ad4138 GN |
515 | __u8 scope = RT_SCOPE_UNIVERSE; |
516 | ||
4895c771 | 517 | if (sk) { |
4895c771 | 518 | oif = sk->sk_bound_dev_if; |
3c5b4d69 | 519 | mark = READ_ONCE(sk->sk_mark); |
b1ad4138 GN |
520 | tos = ip_sock_rt_tos(sk); |
521 | scope = ip_sock_rt_scope(sk); | |
cafbe182 ED |
522 | prot = inet_test_bit(HDRINCL, sk) ? IPPROTO_RAW : |
523 | sk->sk_protocol; | |
4895c771 | 524 | } |
b1ad4138 GN |
525 | |
526 | flowi4_init_output(fl4, oif, mark, tos & IPTOS_RT_MASK, scope, | |
527 | prot, flow_flags, iph->daddr, iph->saddr, 0, 0, | |
e2d118a1 | 528 | sock_net_uid(net, sk)); |
4895c771 DM |
529 | } |
530 | ||
5abf7f7e ED |
531 | static void build_skb_flow_key(struct flowi4 *fl4, const struct sk_buff *skb, |
532 | const struct sock *sk) | |
4895c771 | 533 | { |
d109e61b | 534 | const struct net *net = dev_net(skb->dev); |
4895c771 DM |
535 | const struct iphdr *iph = ip_hdr(skb); |
536 | int oif = skb->dev->ifindex; | |
4895c771 DM |
537 | u8 prot = iph->protocol; |
538 | u32 mark = skb->mark; | |
b1ad4138 | 539 | __u8 tos = iph->tos; |
4895c771 | 540 | |
d109e61b | 541 | __build_flow_key(net, fl4, sk, iph, oif, tos, prot, mark, 0); |
4895c771 DM |
542 | } |
543 | ||
5abf7f7e | 544 | static void build_sk_flow_key(struct flowi4 *fl4, const struct sock *sk) |
4895c771 DM |
545 | { |
546 | const struct inet_sock *inet = inet_sk(sk); | |
5abf7f7e | 547 | const struct ip_options_rcu *inet_opt; |
4895c771 DM |
548 | __be32 daddr = inet->inet_daddr; |
549 | ||
550 | rcu_read_lock(); | |
551 | inet_opt = rcu_dereference(inet->inet_opt); | |
552 | if (inet_opt && inet_opt->opt.srr) | |
553 | daddr = inet_opt->opt.faddr; | |
3c5b4d69 | 554 | flowi4_init_output(fl4, sk->sk_bound_dev_if, READ_ONCE(sk->sk_mark), |
b1ad4138 GN |
555 | ip_sock_rt_tos(sk) & IPTOS_RT_MASK, |
556 | ip_sock_rt_scope(sk), | |
cafbe182 ED |
557 | inet_test_bit(HDRINCL, sk) ? |
558 | IPPROTO_RAW : sk->sk_protocol, | |
4895c771 | 559 | inet_sk_flowi_flags(sk), |
e2d118a1 | 560 | daddr, inet->inet_saddr, 0, 0, sk->sk_uid); |
4895c771 DM |
561 | rcu_read_unlock(); |
562 | } | |
563 | ||
5abf7f7e ED |
564 | static void ip_rt_build_flow_key(struct flowi4 *fl4, const struct sock *sk, |
565 | const struct sk_buff *skb) | |
4895c771 DM |
566 | { |
567 | if (skb) | |
568 | build_skb_flow_key(fl4, skb, sk); | |
569 | else | |
570 | build_sk_flow_key(fl4, sk); | |
571 | } | |
572 | ||
c5038a83 | 573 | static DEFINE_SPINLOCK(fnhe_lock); |
4895c771 | 574 | |
2ffae99d TT |
575 | static void fnhe_flush_routes(struct fib_nh_exception *fnhe) |
576 | { | |
577 | struct rtable *rt; | |
578 | ||
579 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
580 | if (rt) { | |
581 | RCU_INIT_POINTER(fnhe->fnhe_rth_input, NULL); | |
95c47f9c | 582 | dst_dev_put(&rt->dst); |
0830106c | 583 | dst_release(&rt->dst); |
2ffae99d TT |
584 | } |
585 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
586 | if (rt) { | |
587 | RCU_INIT_POINTER(fnhe->fnhe_rth_output, NULL); | |
95c47f9c | 588 | dst_dev_put(&rt->dst); |
0830106c | 589 | dst_release(&rt->dst); |
2ffae99d TT |
590 | } |
591 | } | |
592 | ||
67d6d681 | 593 | static void fnhe_remove_oldest(struct fnhe_hash_bucket *hash) |
4895c771 | 594 | { |
67d6d681 ED |
595 | struct fib_nh_exception __rcu **fnhe_p, **oldest_p; |
596 | struct fib_nh_exception *fnhe, *oldest = NULL; | |
4895c771 | 597 | |
67d6d681 ED |
598 | for (fnhe_p = &hash->chain; ; fnhe_p = &fnhe->fnhe_next) { |
599 | fnhe = rcu_dereference_protected(*fnhe_p, | |
600 | lockdep_is_held(&fnhe_lock)); | |
601 | if (!fnhe) | |
602 | break; | |
603 | if (!oldest || | |
604 | time_before(fnhe->fnhe_stamp, oldest->fnhe_stamp)) { | |
4895c771 | 605 | oldest = fnhe; |
67d6d681 ED |
606 | oldest_p = fnhe_p; |
607 | } | |
4895c771 | 608 | } |
2ffae99d | 609 | fnhe_flush_routes(oldest); |
67d6d681 ED |
610 | *oldest_p = oldest->fnhe_next; |
611 | kfree_rcu(oldest, rcu); | |
4895c771 DM |
612 | } |
613 | ||
6457378f | 614 | static u32 fnhe_hashfun(__be32 daddr) |
d3a25c98 | 615 | { |
49ecc2e9 | 616 | static siphash_aligned_key_t fnhe_hash_key; |
6457378f | 617 | u64 hval; |
d3a25c98 | 618 | |
6457378f ED |
619 | net_get_random_once(&fnhe_hash_key, sizeof(fnhe_hash_key)); |
620 | hval = siphash_1u32((__force u32)daddr, &fnhe_hash_key); | |
621 | return hash_64(hval, FNHE_HASH_SHIFT); | |
d3a25c98 DM |
622 | } |
623 | ||
387aa65a TT |
624 | static void fill_route_from_fnhe(struct rtable *rt, struct fib_nh_exception *fnhe) |
625 | { | |
626 | rt->rt_pmtu = fnhe->fnhe_pmtu; | |
d52e5a7e | 627 | rt->rt_mtu_locked = fnhe->fnhe_mtu_locked; |
387aa65a TT |
628 | rt->dst.expires = fnhe->fnhe_expires; |
629 | ||
630 | if (fnhe->fnhe_gw) { | |
631 | rt->rt_flags |= RTCF_REDIRECTED; | |
77d5bc7e | 632 | rt->rt_uses_gateway = 1; |
1550c171 DA |
633 | rt->rt_gw_family = AF_INET; |
634 | rt->rt_gw4 = fnhe->fnhe_gw; | |
387aa65a TT |
635 | } |
636 | } | |
637 | ||
a5995e71 DA |
638 | static void update_or_create_fnhe(struct fib_nh_common *nhc, __be32 daddr, |
639 | __be32 gw, u32 pmtu, bool lock, | |
640 | unsigned long expires) | |
4895c771 | 641 | { |
aee06da6 | 642 | struct fnhe_hash_bucket *hash; |
4895c771 | 643 | struct fib_nh_exception *fnhe; |
387aa65a | 644 | struct rtable *rt; |
cebe84c6 | 645 | u32 genid, hval; |
387aa65a | 646 | unsigned int i; |
4895c771 | 647 | int depth; |
cebe84c6 | 648 | |
a5995e71 | 649 | genid = fnhe_genid(dev_net(nhc->nhc_dev)); |
cebe84c6 | 650 | hval = fnhe_hashfun(daddr); |
aee06da6 | 651 | |
c5038a83 | 652 | spin_lock_bh(&fnhe_lock); |
4895c771 | 653 | |
a5995e71 | 654 | hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 | 655 | if (!hash) { |
6396bb22 | 656 | hash = kcalloc(FNHE_HASH_SIZE, sizeof(*hash), GFP_ATOMIC); |
4895c771 | 657 | if (!hash) |
aee06da6 | 658 | goto out_unlock; |
a5995e71 | 659 | rcu_assign_pointer(nhc->nhc_exceptions, hash); |
4895c771 DM |
660 | } |
661 | ||
4895c771 DM |
662 | hash += hval; |
663 | ||
664 | depth = 0; | |
665 | for (fnhe = rcu_dereference(hash->chain); fnhe; | |
666 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
667 | if (fnhe->fnhe_daddr == daddr) | |
aee06da6 | 668 | break; |
4895c771 DM |
669 | depth++; |
670 | } | |
671 | ||
aee06da6 | 672 | if (fnhe) { |
cebe84c6 XL |
673 | if (fnhe->fnhe_genid != genid) |
674 | fnhe->fnhe_genid = genid; | |
aee06da6 JA |
675 | if (gw) |
676 | fnhe->fnhe_gw = gw; | |
d52e5a7e | 677 | if (pmtu) { |
aee06da6 | 678 | fnhe->fnhe_pmtu = pmtu; |
d52e5a7e SD |
679 | fnhe->fnhe_mtu_locked = lock; |
680 | } | |
e39d5246 | 681 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 682 | /* Update all cached dsts too */ |
2ffae99d TT |
683 | rt = rcu_dereference(fnhe->fnhe_rth_input); |
684 | if (rt) | |
685 | fill_route_from_fnhe(rt, fnhe); | |
686 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
387aa65a TT |
687 | if (rt) |
688 | fill_route_from_fnhe(rt, fnhe); | |
aee06da6 | 689 | } else { |
67d6d681 ED |
690 | /* Randomize max depth to avoid some side channels attacks. */ |
691 | int max_depth = FNHE_RECLAIM_DEPTH + | |
8032bf12 | 692 | get_random_u32_below(FNHE_RECLAIM_DEPTH); |
67d6d681 ED |
693 | |
694 | while (depth > max_depth) { | |
695 | fnhe_remove_oldest(hash); | |
696 | depth--; | |
aee06da6 | 697 | } |
67d6d681 ED |
698 | |
699 | fnhe = kzalloc(sizeof(*fnhe), GFP_ATOMIC); | |
700 | if (!fnhe) | |
701 | goto out_unlock; | |
702 | ||
703 | fnhe->fnhe_next = hash->chain; | |
704 | ||
cebe84c6 | 705 | fnhe->fnhe_genid = genid; |
aee06da6 JA |
706 | fnhe->fnhe_daddr = daddr; |
707 | fnhe->fnhe_gw = gw; | |
708 | fnhe->fnhe_pmtu = pmtu; | |
d52e5a7e | 709 | fnhe->fnhe_mtu_locked = lock; |
94720e3a | 710 | fnhe->fnhe_expires = max(1UL, expires); |
387aa65a | 711 | |
67d6d681 ED |
712 | rcu_assign_pointer(hash->chain, fnhe); |
713 | ||
387aa65a TT |
714 | /* Exception created; mark the cached routes for the nexthop |
715 | * stale, so anyone caching it rechecks if this exception | |
716 | * applies to them. | |
717 | */ | |
0f457a36 | 718 | rt = rcu_dereference(nhc->nhc_rth_input); |
2ffae99d TT |
719 | if (rt) |
720 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
721 | ||
387aa65a TT |
722 | for_each_possible_cpu(i) { |
723 | struct rtable __rcu **prt; | |
6ad08600 | 724 | |
0f457a36 | 725 | prt = per_cpu_ptr(nhc->nhc_pcpu_rth_output, i); |
387aa65a TT |
726 | rt = rcu_dereference(*prt); |
727 | if (rt) | |
728 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
729 | } | |
4895c771 | 730 | } |
4895c771 | 731 | |
4895c771 | 732 | fnhe->fnhe_stamp = jiffies; |
aee06da6 JA |
733 | |
734 | out_unlock: | |
c5038a83 | 735 | spin_unlock_bh(&fnhe_lock); |
4895c771 DM |
736 | } |
737 | ||
ceb33206 DM |
738 | static void __ip_do_redirect(struct rtable *rt, struct sk_buff *skb, struct flowi4 *fl4, |
739 | bool kill_route) | |
1da177e4 | 740 | { |
e47a185b | 741 | __be32 new_gw = icmp_hdr(skb)->un.gateway; |
94206125 | 742 | __be32 old_gw = ip_hdr(skb)->saddr; |
e47a185b | 743 | struct net_device *dev = skb->dev; |
e47a185b | 744 | struct in_device *in_dev; |
4895c771 | 745 | struct fib_result res; |
e47a185b | 746 | struct neighbour *n; |
317805b8 | 747 | struct net *net; |
1da177e4 | 748 | |
94206125 DM |
749 | switch (icmp_hdr(skb)->code & 7) { |
750 | case ICMP_REDIR_NET: | |
751 | case ICMP_REDIR_NETTOS: | |
752 | case ICMP_REDIR_HOST: | |
753 | case ICMP_REDIR_HOSTTOS: | |
754 | break; | |
755 | ||
756 | default: | |
757 | return; | |
758 | } | |
759 | ||
1550c171 | 760 | if (rt->rt_gw_family != AF_INET || rt->rt_gw4 != old_gw) |
e47a185b DM |
761 | return; |
762 | ||
763 | in_dev = __in_dev_get_rcu(dev); | |
764 | if (!in_dev) | |
765 | return; | |
766 | ||
c346dca1 | 767 | net = dev_net(dev); |
9d4fb27d JP |
768 | if (new_gw == old_gw || !IN_DEV_RX_REDIRECTS(in_dev) || |
769 | ipv4_is_multicast(new_gw) || ipv4_is_lbcast(new_gw) || | |
770 | ipv4_is_zeronet(new_gw)) | |
1da177e4 LT |
771 | goto reject_redirect; |
772 | ||
773 | if (!IN_DEV_SHARED_MEDIA(in_dev)) { | |
774 | if (!inet_addr_onlink(in_dev, new_gw, old_gw)) | |
775 | goto reject_redirect; | |
776 | if (IN_DEV_SEC_REDIRECTS(in_dev) && ip_fib_check_default(new_gw, dev)) | |
777 | goto reject_redirect; | |
778 | } else { | |
317805b8 | 779 | if (inet_addr_type(net, new_gw) != RTN_UNICAST) |
1da177e4 LT |
780 | goto reject_redirect; |
781 | } | |
782 | ||
c0e29262 | 783 | n = __ipv4_neigh_lookup(rt->dst.dev, (__force u32)new_gw); |
969447f2 SSL |
784 | if (!n) |
785 | n = neigh_create(&arp_tbl, &new_gw, rt->dst.dev); | |
2c1a4311 | 786 | if (!IS_ERR(n)) { |
b071af52 | 787 | if (!(READ_ONCE(n->nud_state) & NUD_VALID)) { |
e47a185b DM |
788 | neigh_event_send(n, NULL); |
789 | } else { | |
0eeb075f | 790 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
2fbc6e89 | 791 | struct fib_nh_common *nhc; |
4895c771 | 792 | |
2fbc6e89 DA |
793 | fib_select_path(net, &res, fl4, skb); |
794 | nhc = FIB_RES_NHC(res); | |
a5995e71 | 795 | update_or_create_fnhe(nhc, fl4->daddr, new_gw, |
d52e5a7e SD |
796 | 0, false, |
797 | jiffies + ip_rt_gc_timeout); | |
4895c771 | 798 | } |
ceb33206 DM |
799 | if (kill_route) |
800 | rt->dst.obsolete = DST_OBSOLETE_KILL; | |
e47a185b DM |
801 | call_netevent_notifiers(NETEVENT_NEIGH_UPDATE, n); |
802 | } | |
803 | neigh_release(n); | |
804 | } | |
805 | return; | |
806 | ||
807 | reject_redirect: | |
808 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
99ee038d DM |
809 | if (IN_DEV_LOG_MARTIANS(in_dev)) { |
810 | const struct iphdr *iph = (const struct iphdr *) skb->data; | |
811 | __be32 daddr = iph->daddr; | |
812 | __be32 saddr = iph->saddr; | |
813 | ||
e47a185b DM |
814 | net_info_ratelimited("Redirect from %pI4 on %s about %pI4 ignored\n" |
815 | " Advised path = %pI4 -> %pI4\n", | |
816 | &old_gw, dev->name, &new_gw, | |
817 | &saddr, &daddr); | |
99ee038d | 818 | } |
e47a185b DM |
819 | #endif |
820 | ; | |
821 | } | |
822 | ||
4895c771 DM |
823 | static void ip_do_redirect(struct dst_entry *dst, struct sock *sk, struct sk_buff *skb) |
824 | { | |
825 | struct rtable *rt; | |
826 | struct flowi4 fl4; | |
f96ef988 | 827 | const struct iphdr *iph = (const struct iphdr *) skb->data; |
7d995694 | 828 | struct net *net = dev_net(skb->dev); |
f96ef988 | 829 | int oif = skb->dev->ifindex; |
f96ef988 MK |
830 | u8 prot = iph->protocol; |
831 | u32 mark = skb->mark; | |
b1ad4138 | 832 | __u8 tos = iph->tos; |
4895c771 DM |
833 | |
834 | rt = (struct rtable *) dst; | |
835 | ||
7d995694 | 836 | __build_flow_key(net, &fl4, sk, iph, oif, tos, prot, mark, 0); |
ceb33206 | 837 | __ip_do_redirect(rt, skb, &fl4, true); |
4895c771 DM |
838 | } |
839 | ||
1da177e4 LT |
840 | static struct dst_entry *ipv4_negative_advice(struct dst_entry *dst) |
841 | { | |
ee6b9673 | 842 | struct rtable *rt = (struct rtable *)dst; |
1da177e4 LT |
843 | struct dst_entry *ret = dst; |
844 | ||
845 | if (rt) { | |
d11a4dc1 | 846 | if (dst->obsolete > 0) { |
1da177e4 LT |
847 | ip_rt_put(rt); |
848 | ret = NULL; | |
5943634f DM |
849 | } else if ((rt->rt_flags & RTCF_REDIRECTED) || |
850 | rt->dst.expires) { | |
89aef892 | 851 | ip_rt_put(rt); |
1da177e4 LT |
852 | ret = NULL; |
853 | } | |
854 | } | |
855 | return ret; | |
856 | } | |
857 | ||
858 | /* | |
859 | * Algorithm: | |
860 | * 1. The first ip_rt_redirect_number redirects are sent | |
861 | * with exponential backoff, then we stop sending them at all, | |
862 | * assuming that the host ignores our redirects. | |
863 | * 2. If we did not see packets requiring redirects | |
864 | * during ip_rt_redirect_silence, we assume that the host | |
865 | * forgot redirected route and start to send redirects again. | |
866 | * | |
867 | * This algorithm is much cheaper and more intelligent than dumb load limiting | |
868 | * in icmp.c. | |
869 | * | |
870 | * NOTE. Do not forget to inhibit load limiting for redirects (redundant) | |
871 | * and "frag. need" (breaks PMTU discovery) in icmp.c. | |
872 | */ | |
873 | ||
874 | void ip_rt_send_redirect(struct sk_buff *skb) | |
875 | { | |
511c3f92 | 876 | struct rtable *rt = skb_rtable(skb); |
30038fc6 | 877 | struct in_device *in_dev; |
92d86829 | 878 | struct inet_peer *peer; |
1d861aa4 | 879 | struct net *net; |
30038fc6 | 880 | int log_martians; |
192132b9 | 881 | int vif; |
1da177e4 | 882 | |
30038fc6 | 883 | rcu_read_lock(); |
d8d1f30b | 884 | in_dev = __in_dev_get_rcu(rt->dst.dev); |
30038fc6 ED |
885 | if (!in_dev || !IN_DEV_TX_REDIRECTS(in_dev)) { |
886 | rcu_read_unlock(); | |
1da177e4 | 887 | return; |
30038fc6 ED |
888 | } |
889 | log_martians = IN_DEV_LOG_MARTIANS(in_dev); | |
385add90 | 890 | vif = l3mdev_master_ifindex_rcu(rt->dst.dev); |
30038fc6 | 891 | rcu_read_unlock(); |
1da177e4 | 892 | |
1d861aa4 | 893 | net = dev_net(rt->dst.dev); |
192132b9 | 894 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, vif, 1); |
92d86829 | 895 | if (!peer) { |
e81da0e1 JA |
896 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, |
897 | rt_nexthop(rt, ip_hdr(skb)->daddr)); | |
92d86829 DM |
898 | return; |
899 | } | |
900 | ||
1da177e4 LT |
901 | /* No redirected packets during ip_rt_redirect_silence; |
902 | * reset the algorithm. | |
903 | */ | |
c09551c6 | 904 | if (time_after(jiffies, peer->rate_last + ip_rt_redirect_silence)) { |
92d86829 | 905 | peer->rate_tokens = 0; |
c09551c6 LB |
906 | peer->n_redirects = 0; |
907 | } | |
1da177e4 LT |
908 | |
909 | /* Too many ignored redirects; do not send anything | |
d8d1f30b | 910 | * set dst.rate_last to the last seen redirected packet. |
1da177e4 | 911 | */ |
c09551c6 | 912 | if (peer->n_redirects >= ip_rt_redirect_number) { |
92d86829 | 913 | peer->rate_last = jiffies; |
1d861aa4 | 914 | goto out_put_peer; |
1da177e4 LT |
915 | } |
916 | ||
917 | /* Check for load limit; set rate_last to the latest sent | |
918 | * redirect. | |
919 | */ | |
57644431 | 920 | if (peer->n_redirects == 0 || |
14fb8a76 | 921 | time_after(jiffies, |
92d86829 | 922 | (peer->rate_last + |
b406472b | 923 | (ip_rt_redirect_load << peer->n_redirects)))) { |
e81da0e1 JA |
924 | __be32 gw = rt_nexthop(rt, ip_hdr(skb)->daddr); |
925 | ||
926 | icmp_send(skb, ICMP_REDIRECT, ICMP_REDIR_HOST, gw); | |
92d86829 | 927 | peer->rate_last = jiffies; |
c09551c6 | 928 | ++peer->n_redirects; |
cf1b7201 | 929 | if (IS_ENABLED(CONFIG_IP_ROUTE_VERBOSE) && log_martians && |
b406472b | 930 | peer->n_redirects == ip_rt_redirect_number) |
e87cc472 | 931 | net_warn_ratelimited("host %pI4/if%d ignores redirects for %pI4 to %pI4\n", |
92101b3b | 932 | &ip_hdr(skb)->saddr, inet_iif(skb), |
e81da0e1 | 933 | &ip_hdr(skb)->daddr, &gw); |
1da177e4 | 934 | } |
1d861aa4 DM |
935 | out_put_peer: |
936 | inet_putpeer(peer); | |
1da177e4 LT |
937 | } |
938 | ||
939 | static int ip_error(struct sk_buff *skb) | |
940 | { | |
511c3f92 | 941 | struct rtable *rt = skb_rtable(skb); |
e2c0dc1f SS |
942 | struct net_device *dev = skb->dev; |
943 | struct in_device *in_dev; | |
92d86829 | 944 | struct inet_peer *peer; |
1da177e4 | 945 | unsigned long now; |
251da413 | 946 | struct net *net; |
c4eb6641 | 947 | SKB_DR(reason); |
92d86829 | 948 | bool send; |
1da177e4 LT |
949 | int code; |
950 | ||
e2c0dc1f SS |
951 | if (netif_is_l3_master(skb->dev)) { |
952 | dev = __dev_get_by_index(dev_net(skb->dev), IPCB(skb)->iif); | |
953 | if (!dev) | |
954 | goto out; | |
955 | } | |
956 | ||
957 | in_dev = __in_dev_get_rcu(dev); | |
958 | ||
381c759d EB |
959 | /* IP on this device is disabled. */ |
960 | if (!in_dev) | |
961 | goto out; | |
962 | ||
251da413 DM |
963 | net = dev_net(rt->dst.dev); |
964 | if (!IN_DEV_FORWARD(in_dev)) { | |
965 | switch (rt->dst.error) { | |
966 | case EHOSTUNREACH: | |
c4eb6641 | 967 | SKB_DR_SET(reason, IP_INADDRERRORS); |
b45386ef | 968 | __IP_INC_STATS(net, IPSTATS_MIB_INADDRERRORS); |
251da413 DM |
969 | break; |
970 | ||
971 | case ENETUNREACH: | |
c4eb6641 | 972 | SKB_DR_SET(reason, IP_INNOROUTES); |
b45386ef | 973 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
251da413 DM |
974 | break; |
975 | } | |
976 | goto out; | |
977 | } | |
978 | ||
d8d1f30b | 979 | switch (rt->dst.error) { |
4500ebf8 JP |
980 | case EINVAL: |
981 | default: | |
982 | goto out; | |
983 | case EHOSTUNREACH: | |
984 | code = ICMP_HOST_UNREACH; | |
985 | break; | |
986 | case ENETUNREACH: | |
987 | code = ICMP_NET_UNREACH; | |
c4eb6641 | 988 | SKB_DR_SET(reason, IP_INNOROUTES); |
b45386ef | 989 | __IP_INC_STATS(net, IPSTATS_MIB_INNOROUTES); |
4500ebf8 JP |
990 | break; |
991 | case EACCES: | |
992 | code = ICMP_PKT_FILTERED; | |
993 | break; | |
1da177e4 LT |
994 | } |
995 | ||
192132b9 | 996 | peer = inet_getpeer_v4(net->ipv4.peers, ip_hdr(skb)->saddr, |
385add90 | 997 | l3mdev_master_ifindex(skb->dev), 1); |
92d86829 DM |
998 | |
999 | send = true; | |
1000 | if (peer) { | |
1001 | now = jiffies; | |
1002 | peer->rate_tokens += now - peer->rate_last; | |
1003 | if (peer->rate_tokens > ip_rt_error_burst) | |
1004 | peer->rate_tokens = ip_rt_error_burst; | |
1005 | peer->rate_last = now; | |
1006 | if (peer->rate_tokens >= ip_rt_error_cost) | |
1007 | peer->rate_tokens -= ip_rt_error_cost; | |
1008 | else | |
1009 | send = false; | |
1d861aa4 | 1010 | inet_putpeer(peer); |
1da177e4 | 1011 | } |
92d86829 DM |
1012 | if (send) |
1013 | icmp_send(skb, ICMP_DEST_UNREACH, code, 0); | |
1da177e4 | 1014 | |
c4eb6641 | 1015 | out: kfree_skb_reason(skb, reason); |
1da177e4 | 1016 | return 0; |
e905a9ed | 1017 | } |
1da177e4 | 1018 | |
d851c12b | 1019 | static void __ip_rt_update_pmtu(struct rtable *rt, struct flowi4 *fl4, u32 mtu) |
1da177e4 | 1020 | { |
d851c12b | 1021 | struct dst_entry *dst = &rt->dst; |
2fbc6e89 | 1022 | struct net *net = dev_net(dst->dev); |
4895c771 | 1023 | struct fib_result res; |
d52e5a7e | 1024 | bool lock = false; |
8b4510d7 | 1025 | u32 old_mtu; |
2c8cec5c | 1026 | |
d52e5a7e | 1027 | if (ip_mtu_locked(dst)) |
fa1e492a SK |
1028 | return; |
1029 | ||
8b4510d7 | 1030 | old_mtu = ipv4_mtu(dst); |
28d35bcd | 1031 | if (old_mtu < mtu) |
3cdaa5be LW |
1032 | return; |
1033 | ||
1de6b15a | 1034 | if (mtu < net->ipv4.ip_rt_min_pmtu) { |
d52e5a7e | 1035 | lock = true; |
1de6b15a | 1036 | mtu = min(old_mtu, net->ipv4.ip_rt_min_pmtu); |
d52e5a7e | 1037 | } |
2c8cec5c | 1038 | |
28d35bcd | 1039 | if (rt->rt_pmtu == mtu && !lock && |
1135fad2 | 1040 | time_before(jiffies, dst->expires - net->ipv4.ip_rt_mtu_expires / 2)) |
f016229e TT |
1041 | return; |
1042 | ||
c5ae7d41 | 1043 | rcu_read_lock(); |
2fbc6e89 DA |
1044 | if (fib_lookup(net, fl4, &res, 0) == 0) { |
1045 | struct fib_nh_common *nhc; | |
4895c771 | 1046 | |
2fbc6e89 DA |
1047 | fib_select_path(net, &res, fl4, NULL); |
1048 | nhc = FIB_RES_NHC(res); | |
a5995e71 | 1049 | update_or_create_fnhe(nhc, fl4->daddr, 0, mtu, lock, |
1135fad2 | 1050 | jiffies + net->ipv4.ip_rt_mtu_expires); |
4895c771 | 1051 | } |
c5ae7d41 | 1052 | rcu_read_unlock(); |
1da177e4 LT |
1053 | } |
1054 | ||
4895c771 | 1055 | static void ip_rt_update_pmtu(struct dst_entry *dst, struct sock *sk, |
bd085ef6 HL |
1056 | struct sk_buff *skb, u32 mtu, |
1057 | bool confirm_neigh) | |
4895c771 DM |
1058 | { |
1059 | struct rtable *rt = (struct rtable *) dst; | |
1060 | struct flowi4 fl4; | |
1061 | ||
1062 | ip_rt_build_flow_key(&fl4, sk, skb); | |
df23bb18 SB |
1063 | |
1064 | /* Don't make lookup fail for bridged encapsulations */ | |
1065 | if (skb && netif_is_any_bridge_port(skb->dev)) | |
1066 | fl4.flowi4_oif = 0; | |
1067 | ||
d851c12b | 1068 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
4895c771 DM |
1069 | } |
1070 | ||
36393395 | 1071 | void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, |
d888f396 | 1072 | int oif, u8 protocol) |
36393395 | 1073 | { |
5af68891 | 1074 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
36393395 DM |
1075 | struct flowi4 fl4; |
1076 | struct rtable *rt; | |
d888f396 | 1077 | u32 mark = IP4_REPLY_MARK(net, skb->mark); |
1b3c61dc | 1078 | |
b1ad4138 GN |
1079 | __build_flow_key(net, &fl4, NULL, iph, oif, iph->tos, protocol, mark, |
1080 | 0); | |
36393395 DM |
1081 | rt = __ip_route_output_key(net, &fl4); |
1082 | if (!IS_ERR(rt)) { | |
4895c771 | 1083 | __ip_rt_update_pmtu(rt, &fl4, mtu); |
36393395 DM |
1084 | ip_rt_put(rt); |
1085 | } | |
1086 | } | |
1087 | EXPORT_SYMBOL_GPL(ipv4_update_pmtu); | |
1088 | ||
9cb3a50c | 1089 | static void __ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) |
36393395 | 1090 | { |
343d8c60 | 1091 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
4895c771 DM |
1092 | struct flowi4 fl4; |
1093 | struct rtable *rt; | |
36393395 | 1094 | |
e2d118a1 | 1095 | __build_flow_key(sock_net(sk), &fl4, sk, iph, 0, 0, 0, 0, 0); |
1b3c61dc LC |
1096 | |
1097 | if (!fl4.flowi4_mark) | |
1098 | fl4.flowi4_mark = IP4_REPLY_MARK(sock_net(sk), skb->mark); | |
1099 | ||
4895c771 DM |
1100 | rt = __ip_route_output_key(sock_net(sk), &fl4); |
1101 | if (!IS_ERR(rt)) { | |
1102 | __ip_rt_update_pmtu(rt, &fl4, mtu); | |
1103 | ip_rt_put(rt); | |
1104 | } | |
36393395 | 1105 | } |
9cb3a50c SK |
1106 | |
1107 | void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu) | |
1108 | { | |
5af68891 | 1109 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
9cb3a50c SK |
1110 | struct flowi4 fl4; |
1111 | struct rtable *rt; | |
7f502361 | 1112 | struct dst_entry *odst = NULL; |
b44108db | 1113 | bool new = false; |
e2d118a1 | 1114 | struct net *net = sock_net(sk); |
9cb3a50c SK |
1115 | |
1116 | bh_lock_sock(sk); | |
482fc609 HFS |
1117 | |
1118 | if (!ip_sk_accept_pmtu(sk)) | |
1119 | goto out; | |
1120 | ||
7f502361 | 1121 | odst = sk_dst_get(sk); |
9cb3a50c | 1122 | |
7f502361 | 1123 | if (sock_owned_by_user(sk) || !odst) { |
9cb3a50c SK |
1124 | __ipv4_sk_update_pmtu(skb, sk, mtu); |
1125 | goto out; | |
1126 | } | |
1127 | ||
e2d118a1 | 1128 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
9cb3a50c | 1129 | |
7f502361 | 1130 | rt = (struct rtable *)odst; |
51456b29 | 1131 | if (odst->obsolete && !odst->ops->check(odst, 0)) { |
9cb3a50c SK |
1132 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1133 | if (IS_ERR(rt)) | |
1134 | goto out; | |
b44108db SK |
1135 | |
1136 | new = true; | |
9cb3a50c SK |
1137 | } |
1138 | ||
343d8c60 | 1139 | __ip_rt_update_pmtu((struct rtable *)xfrm_dst_path(&rt->dst), &fl4, mtu); |
9cb3a50c | 1140 | |
7f502361 | 1141 | if (!dst_check(&rt->dst, 0)) { |
b44108db SK |
1142 | if (new) |
1143 | dst_release(&rt->dst); | |
1144 | ||
9cb3a50c SK |
1145 | rt = ip_route_output_flow(sock_net(sk), &fl4, sk); |
1146 | if (IS_ERR(rt)) | |
1147 | goto out; | |
1148 | ||
b44108db | 1149 | new = true; |
9cb3a50c SK |
1150 | } |
1151 | ||
b44108db | 1152 | if (new) |
7f502361 | 1153 | sk_dst_set(sk, &rt->dst); |
9cb3a50c SK |
1154 | |
1155 | out: | |
1156 | bh_unlock_sock(sk); | |
7f502361 | 1157 | dst_release(odst); |
9cb3a50c | 1158 | } |
36393395 | 1159 | EXPORT_SYMBOL_GPL(ipv4_sk_update_pmtu); |
f39925db | 1160 | |
b42597e2 | 1161 | void ipv4_redirect(struct sk_buff *skb, struct net *net, |
1042caa7 | 1162 | int oif, u8 protocol) |
b42597e2 | 1163 | { |
5af68891 | 1164 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
b42597e2 DM |
1165 | struct flowi4 fl4; |
1166 | struct rtable *rt; | |
1167 | ||
b1ad4138 | 1168 | __build_flow_key(net, &fl4, NULL, iph, oif, iph->tos, protocol, 0, 0); |
b42597e2 DM |
1169 | rt = __ip_route_output_key(net, &fl4); |
1170 | if (!IS_ERR(rt)) { | |
ceb33206 | 1171 | __ip_do_redirect(rt, skb, &fl4, false); |
b42597e2 DM |
1172 | ip_rt_put(rt); |
1173 | } | |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(ipv4_redirect); | |
1176 | ||
1177 | void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk) | |
1178 | { | |
343d8c60 | 1179 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
4895c771 DM |
1180 | struct flowi4 fl4; |
1181 | struct rtable *rt; | |
e2d118a1 | 1182 | struct net *net = sock_net(sk); |
b42597e2 | 1183 | |
e2d118a1 LC |
1184 | __build_flow_key(net, &fl4, sk, iph, 0, 0, 0, 0, 0); |
1185 | rt = __ip_route_output_key(net, &fl4); | |
4895c771 | 1186 | if (!IS_ERR(rt)) { |
ceb33206 | 1187 | __ip_do_redirect(rt, skb, &fl4, false); |
4895c771 DM |
1188 | ip_rt_put(rt); |
1189 | } | |
b42597e2 DM |
1190 | } |
1191 | EXPORT_SYMBOL_GPL(ipv4_sk_redirect); | |
1192 | ||
bbd807df BV |
1193 | INDIRECT_CALLABLE_SCOPE struct dst_entry *ipv4_dst_check(struct dst_entry *dst, |
1194 | u32 cookie) | |
efbc368d DM |
1195 | { |
1196 | struct rtable *rt = (struct rtable *) dst; | |
1197 | ||
ceb33206 DM |
1198 | /* All IPV4 dsts are created with ->obsolete set to the value |
1199 | * DST_OBSOLETE_FORCE_CHK which forces validation calls down | |
1200 | * into this function always. | |
1201 | * | |
387aa65a TT |
1202 | * When a PMTU/redirect information update invalidates a route, |
1203 | * this is indicated by setting obsolete to DST_OBSOLETE_KILL or | |
02afc7ad | 1204 | * DST_OBSOLETE_DEAD. |
ceb33206 | 1205 | */ |
387aa65a | 1206 | if (dst->obsolete != DST_OBSOLETE_FORCE_CHK || rt_is_expired(rt)) |
efbc368d | 1207 | return NULL; |
d11a4dc1 | 1208 | return dst; |
1da177e4 | 1209 | } |
9c97921a | 1210 | EXPORT_INDIRECT_CALLABLE(ipv4_dst_check); |
1da177e4 | 1211 | |
20ff83f1 | 1212 | static void ipv4_send_dest_unreach(struct sk_buff *skb) |
1da177e4 | 1213 | { |
0113d9c9 | 1214 | struct net_device *dev; |
ed0de45a | 1215 | struct ip_options opt; |
c543cb4a | 1216 | int res; |
1da177e4 | 1217 | |
ed0de45a | 1218 | /* Recompile ip options since IPCB may not be valid anymore. |
20ff83f1 | 1219 | * Also check we have a reasonable ipv4 header. |
ed0de45a | 1220 | */ |
20ff83f1 ED |
1221 | if (!pskb_network_may_pull(skb, sizeof(struct iphdr)) || |
1222 | ip_hdr(skb)->version != 4 || ip_hdr(skb)->ihl < 5) | |
1223 | return; | |
c543cb4a | 1224 | |
20ff83f1 ED |
1225 | memset(&opt, 0, sizeof(opt)); |
1226 | if (ip_hdr(skb)->ihl > 5) { | |
1227 | if (!pskb_network_may_pull(skb, ip_hdr(skb)->ihl * 4)) | |
1228 | return; | |
1229 | opt.optlen = ip_hdr(skb)->ihl * 4 - sizeof(struct iphdr); | |
c543cb4a | 1230 | |
20ff83f1 | 1231 | rcu_read_lock(); |
0113d9c9 KZ |
1232 | dev = skb->dev ? skb->dev : skb_rtable(skb)->dst.dev; |
1233 | res = __ip_options_compile(dev_net(dev), &opt, skb, NULL); | |
20ff83f1 | 1234 | rcu_read_unlock(); |
ed0de45a | 1235 | |
20ff83f1 ED |
1236 | if (res) |
1237 | return; | |
1238 | } | |
ed0de45a | 1239 | __icmp_send(skb, ICMP_DEST_UNREACH, ICMP_HOST_UNREACH, 0, &opt); |
20ff83f1 ED |
1240 | } |
1241 | ||
1242 | static void ipv4_link_failure(struct sk_buff *skb) | |
1243 | { | |
1244 | struct rtable *rt; | |
1245 | ||
1246 | ipv4_send_dest_unreach(skb); | |
1da177e4 | 1247 | |
511c3f92 | 1248 | rt = skb_rtable(skb); |
5943634f DM |
1249 | if (rt) |
1250 | dst_set_expires(&rt->dst, 0); | |
1da177e4 LT |
1251 | } |
1252 | ||
ede2059d | 1253 | static int ip_rt_bug(struct net *net, struct sock *sk, struct sk_buff *skb) |
1da177e4 | 1254 | { |
91df42be JP |
1255 | pr_debug("%s: %pI4 -> %pI4, %s\n", |
1256 | __func__, &ip_hdr(skb)->saddr, &ip_hdr(skb)->daddr, | |
1257 | skb->dev ? skb->dev->name : "?"); | |
1da177e4 | 1258 | kfree_skb(skb); |
c378a9c0 | 1259 | WARN_ON(1); |
1da177e4 LT |
1260 | return 0; |
1261 | } | |
1262 | ||
1263 | /* | |
6ad08600 SK |
1264 | * We do not cache source address of outgoing interface, |
1265 | * because it is used only by IP RR, TS and SRR options, | |
1266 | * so that it out of fast path. | |
1267 | * | |
1268 | * BTW remember: "addr" is allowed to be not aligned | |
1269 | * in IP options! | |
1da177e4 LT |
1270 | */ |
1271 | ||
8e36360a | 1272 | void ip_rt_get_source(u8 *addr, struct sk_buff *skb, struct rtable *rt) |
1da177e4 | 1273 | { |
a61ced5d | 1274 | __be32 src; |
1da177e4 | 1275 | |
c7537967 | 1276 | if (rt_is_output_route(rt)) |
c5be24ff | 1277 | src = ip_hdr(skb)->saddr; |
ebc0ffae | 1278 | else { |
8e36360a | 1279 | struct fib_result res; |
e351bb62 MÅ» |
1280 | struct iphdr *iph = ip_hdr(skb); |
1281 | struct flowi4 fl4 = { | |
1282 | .daddr = iph->daddr, | |
1283 | .saddr = iph->saddr, | |
1284 | .flowi4_tos = RT_TOS(iph->tos), | |
1285 | .flowi4_oif = rt->dst.dev->ifindex, | |
1286 | .flowi4_iif = skb->dev->ifindex, | |
1287 | .flowi4_mark = skb->mark, | |
1288 | }; | |
5e2b61f7 | 1289 | |
ebc0ffae | 1290 | rcu_read_lock(); |
0eeb075f | 1291 | if (fib_lookup(dev_net(rt->dst.dev), &fl4, &res, 0) == 0) |
eba618ab | 1292 | src = fib_result_prefsrc(dev_net(rt->dst.dev), &res); |
ebc0ffae | 1293 | else |
f8126f1d DM |
1294 | src = inet_select_addr(rt->dst.dev, |
1295 | rt_nexthop(rt, iph->daddr), | |
1296 | RT_SCOPE_UNIVERSE); | |
ebc0ffae ED |
1297 | rcu_read_unlock(); |
1298 | } | |
1da177e4 LT |
1299 | memcpy(addr, &src, 4); |
1300 | } | |
1301 | ||
c7066f70 | 1302 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 LT |
1303 | static void set_class_tag(struct rtable *rt, u32 tag) |
1304 | { | |
d8d1f30b CG |
1305 | if (!(rt->dst.tclassid & 0xFFFF)) |
1306 | rt->dst.tclassid |= tag & 0xFFFF; | |
1307 | if (!(rt->dst.tclassid & 0xFFFF0000)) | |
1308 | rt->dst.tclassid |= tag & 0xFFFF0000; | |
1da177e4 LT |
1309 | } |
1310 | #endif | |
1311 | ||
0dbaee3b DM |
1312 | static unsigned int ipv4_default_advmss(const struct dst_entry *dst) |
1313 | { | |
2e9589ff | 1314 | struct net *net = dev_net(dst->dev); |
7ed14d97 | 1315 | unsigned int header_size = sizeof(struct tcphdr) + sizeof(struct iphdr); |
164a5e7a | 1316 | unsigned int advmss = max_t(unsigned int, ipv4_mtu(dst) - header_size, |
2e9589ff | 1317 | net->ipv4.ip_rt_min_advmss); |
0dbaee3b | 1318 | |
7ed14d97 | 1319 | return min(advmss, IPV4_MAX_PMTU - header_size); |
0dbaee3b DM |
1320 | } |
1321 | ||
f67fbeae | 1322 | INDIRECT_CALLABLE_SCOPE unsigned int ipv4_mtu(const struct dst_entry *dst) |
d33e4553 | 1323 | { |
ac6627a2 | 1324 | return ip_dst_mtu_maybe_forward(dst, false); |
d33e4553 | 1325 | } |
9c97921a | 1326 | EXPORT_INDIRECT_CALLABLE(ipv4_mtu); |
d33e4553 | 1327 | |
a5995e71 | 1328 | static void ip_del_fnhe(struct fib_nh_common *nhc, __be32 daddr) |
94720e3a JA |
1329 | { |
1330 | struct fnhe_hash_bucket *hash; | |
1331 | struct fib_nh_exception *fnhe, __rcu **fnhe_p; | |
1332 | u32 hval = fnhe_hashfun(daddr); | |
1333 | ||
1334 | spin_lock_bh(&fnhe_lock); | |
1335 | ||
a5995e71 | 1336 | hash = rcu_dereference_protected(nhc->nhc_exceptions, |
94720e3a JA |
1337 | lockdep_is_held(&fnhe_lock)); |
1338 | hash += hval; | |
1339 | ||
1340 | fnhe_p = &hash->chain; | |
1341 | fnhe = rcu_dereference_protected(*fnhe_p, lockdep_is_held(&fnhe_lock)); | |
1342 | while (fnhe) { | |
1343 | if (fnhe->fnhe_daddr == daddr) { | |
1344 | rcu_assign_pointer(*fnhe_p, rcu_dereference_protected( | |
1345 | fnhe->fnhe_next, lockdep_is_held(&fnhe_lock))); | |
ee60ad21 XL |
1346 | /* set fnhe_daddr to 0 to ensure it won't bind with |
1347 | * new dsts in rt_bind_exception(). | |
1348 | */ | |
1349 | fnhe->fnhe_daddr = 0; | |
94720e3a JA |
1350 | fnhe_flush_routes(fnhe); |
1351 | kfree_rcu(fnhe, rcu); | |
1352 | break; | |
1353 | } | |
1354 | fnhe_p = &fnhe->fnhe_next; | |
1355 | fnhe = rcu_dereference_protected(fnhe->fnhe_next, | |
1356 | lockdep_is_held(&fnhe_lock)); | |
1357 | } | |
1358 | ||
1359 | spin_unlock_bh(&fnhe_lock); | |
1360 | } | |
1361 | ||
a5995e71 DA |
1362 | static struct fib_nh_exception *find_exception(struct fib_nh_common *nhc, |
1363 | __be32 daddr) | |
4895c771 | 1364 | { |
a5995e71 | 1365 | struct fnhe_hash_bucket *hash = rcu_dereference(nhc->nhc_exceptions); |
4895c771 DM |
1366 | struct fib_nh_exception *fnhe; |
1367 | u32 hval; | |
1368 | ||
f2bb4bed DM |
1369 | if (!hash) |
1370 | return NULL; | |
1371 | ||
d3a25c98 | 1372 | hval = fnhe_hashfun(daddr); |
4895c771 DM |
1373 | |
1374 | for (fnhe = rcu_dereference(hash[hval].chain); fnhe; | |
1375 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
94720e3a JA |
1376 | if (fnhe->fnhe_daddr == daddr) { |
1377 | if (fnhe->fnhe_expires && | |
1378 | time_after(jiffies, fnhe->fnhe_expires)) { | |
a5995e71 | 1379 | ip_del_fnhe(nhc, daddr); |
94720e3a JA |
1380 | break; |
1381 | } | |
f2bb4bed | 1382 | return fnhe; |
94720e3a | 1383 | } |
f2bb4bed DM |
1384 | } |
1385 | return NULL; | |
1386 | } | |
aee06da6 | 1387 | |
50d889b1 DA |
1388 | /* MTU selection: |
1389 | * 1. mtu on route is locked - use it | |
1390 | * 2. mtu from nexthop exception | |
1391 | * 3. mtu from egress device | |
1392 | */ | |
1393 | ||
1394 | u32 ip_mtu_from_fib_result(struct fib_result *res, __be32 daddr) | |
1395 | { | |
eba618ab DA |
1396 | struct fib_nh_common *nhc = res->nhc; |
1397 | struct net_device *dev = nhc->nhc_dev; | |
50d889b1 | 1398 | struct fib_info *fi = res->fi; |
50d889b1 DA |
1399 | u32 mtu = 0; |
1400 | ||
60c158dc | 1401 | if (READ_ONCE(dev_net(dev)->ipv4.sysctl_ip_fwd_use_pmtu) || |
50d889b1 DA |
1402 | fi->fib_metrics->metrics[RTAX_LOCK - 1] & (1 << RTAX_MTU)) |
1403 | mtu = fi->fib_mtu; | |
1404 | ||
1405 | if (likely(!mtu)) { | |
1406 | struct fib_nh_exception *fnhe; | |
1407 | ||
a5995e71 | 1408 | fnhe = find_exception(nhc, daddr); |
50d889b1 DA |
1409 | if (fnhe && !time_after_eq(jiffies, fnhe->fnhe_expires)) |
1410 | mtu = fnhe->fnhe_pmtu; | |
1411 | } | |
1412 | ||
1413 | if (likely(!mtu)) | |
1414 | mtu = min(READ_ONCE(dev->mtu), IP_MAX_MTU); | |
1415 | ||
eba618ab | 1416 | return mtu - lwtunnel_headroom(nhc->nhc_lwtstate, mtu); |
50d889b1 DA |
1417 | } |
1418 | ||
caacf05e | 1419 | static bool rt_bind_exception(struct rtable *rt, struct fib_nh_exception *fnhe, |
a4c2fd7f | 1420 | __be32 daddr, const bool do_cache) |
f2bb4bed | 1421 | { |
caacf05e DM |
1422 | bool ret = false; |
1423 | ||
c5038a83 | 1424 | spin_lock_bh(&fnhe_lock); |
f2bb4bed | 1425 | |
c5038a83 | 1426 | if (daddr == fnhe->fnhe_daddr) { |
2ffae99d TT |
1427 | struct rtable __rcu **porig; |
1428 | struct rtable *orig; | |
5aad1de5 | 1429 | int genid = fnhe_genid(dev_net(rt->dst.dev)); |
2ffae99d TT |
1430 | |
1431 | if (rt_is_input_route(rt)) | |
1432 | porig = &fnhe->fnhe_rth_input; | |
1433 | else | |
1434 | porig = &fnhe->fnhe_rth_output; | |
1435 | orig = rcu_dereference(*porig); | |
5aad1de5 TT |
1436 | |
1437 | if (fnhe->fnhe_genid != genid) { | |
1438 | fnhe->fnhe_genid = genid; | |
13d82bf5 SK |
1439 | fnhe->fnhe_gw = 0; |
1440 | fnhe->fnhe_pmtu = 0; | |
1441 | fnhe->fnhe_expires = 0; | |
0e8411e4 | 1442 | fnhe->fnhe_mtu_locked = false; |
2ffae99d TT |
1443 | fnhe_flush_routes(fnhe); |
1444 | orig = NULL; | |
13d82bf5 | 1445 | } |
387aa65a | 1446 | fill_route_from_fnhe(rt, fnhe); |
1550c171 DA |
1447 | if (!rt->rt_gw4) { |
1448 | rt->rt_gw4 = daddr; | |
1449 | rt->rt_gw_family = AF_INET; | |
1450 | } | |
f2bb4bed | 1451 | |
a4c2fd7f | 1452 | if (do_cache) { |
0830106c | 1453 | dst_hold(&rt->dst); |
2ffae99d | 1454 | rcu_assign_pointer(*porig, rt); |
0830106c | 1455 | if (orig) { |
95c47f9c | 1456 | dst_dev_put(&orig->dst); |
0830106c | 1457 | dst_release(&orig->dst); |
0830106c | 1458 | } |
2ffae99d TT |
1459 | ret = true; |
1460 | } | |
c5038a83 DM |
1461 | |
1462 | fnhe->fnhe_stamp = jiffies; | |
c5038a83 DM |
1463 | } |
1464 | spin_unlock_bh(&fnhe_lock); | |
caacf05e DM |
1465 | |
1466 | return ret; | |
54764bb6 ED |
1467 | } |
1468 | ||
87063a1f | 1469 | static bool rt_cache_route(struct fib_nh_common *nhc, struct rtable *rt) |
f2bb4bed | 1470 | { |
d26b3a7c | 1471 | struct rtable *orig, *prev, **p; |
caacf05e | 1472 | bool ret = true; |
f2bb4bed | 1473 | |
d26b3a7c | 1474 | if (rt_is_input_route(rt)) { |
0f457a36 | 1475 | p = (struct rtable **)&nhc->nhc_rth_input; |
d26b3a7c | 1476 | } else { |
0f457a36 | 1477 | p = (struct rtable **)raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
d26b3a7c | 1478 | } |
f2bb4bed DM |
1479 | orig = *p; |
1480 | ||
0830106c WW |
1481 | /* hold dst before doing cmpxchg() to avoid race condition |
1482 | * on this dst | |
1483 | */ | |
1484 | dst_hold(&rt->dst); | |
f2bb4bed DM |
1485 | prev = cmpxchg(p, orig, rt); |
1486 | if (prev == orig) { | |
0830106c | 1487 | if (orig) { |
5018c596 | 1488 | rt_add_uncached_list(orig); |
0830106c | 1489 | dst_release(&orig->dst); |
0830106c WW |
1490 | } |
1491 | } else { | |
1492 | dst_release(&rt->dst); | |
caacf05e | 1493 | ret = false; |
0830106c | 1494 | } |
caacf05e DM |
1495 | |
1496 | return ret; | |
1497 | } | |
1498 | ||
5055c371 ED |
1499 | struct uncached_list { |
1500 | spinlock_t lock; | |
1501 | struct list_head head; | |
29e5375d | 1502 | struct list_head quarantine; |
5055c371 ED |
1503 | }; |
1504 | ||
1505 | static DEFINE_PER_CPU_ALIGNED(struct uncached_list, rt_uncached_list); | |
caacf05e | 1506 | |
510c321b | 1507 | void rt_add_uncached_list(struct rtable *rt) |
caacf05e | 1508 | { |
5055c371 ED |
1509 | struct uncached_list *ul = raw_cpu_ptr(&rt_uncached_list); |
1510 | ||
d288a162 | 1511 | rt->dst.rt_uncached_list = ul; |
5055c371 ED |
1512 | |
1513 | spin_lock_bh(&ul->lock); | |
d288a162 | 1514 | list_add_tail(&rt->dst.rt_uncached, &ul->head); |
5055c371 | 1515 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1516 | } |
1517 | ||
510c321b | 1518 | void rt_del_uncached_list(struct rtable *rt) |
caacf05e | 1519 | { |
d288a162 WG |
1520 | if (!list_empty(&rt->dst.rt_uncached)) { |
1521 | struct uncached_list *ul = rt->dst.rt_uncached_list; | |
5055c371 ED |
1522 | |
1523 | spin_lock_bh(&ul->lock); | |
d288a162 | 1524 | list_del_init(&rt->dst.rt_uncached); |
5055c371 | 1525 | spin_unlock_bh(&ul->lock); |
caacf05e DM |
1526 | } |
1527 | } | |
1528 | ||
510c321b XL |
1529 | static void ipv4_dst_destroy(struct dst_entry *dst) |
1530 | { | |
510c321b XL |
1531 | struct rtable *rt = (struct rtable *)dst; |
1532 | ||
1620a336 | 1533 | ip_dst_metrics_put(dst); |
510c321b XL |
1534 | rt_del_uncached_list(rt); |
1535 | } | |
1536 | ||
caacf05e DM |
1537 | void rt_flush_dev(struct net_device *dev) |
1538 | { | |
29e5375d | 1539 | struct rtable *rt, *safe; |
5055c371 ED |
1540 | int cpu; |
1541 | ||
1542 | for_each_possible_cpu(cpu) { | |
1543 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
caacf05e | 1544 | |
29e5375d ED |
1545 | if (list_empty(&ul->head)) |
1546 | continue; | |
1547 | ||
5055c371 | 1548 | spin_lock_bh(&ul->lock); |
d288a162 | 1549 | list_for_each_entry_safe(rt, safe, &ul->head, dst.rt_uncached) { |
caacf05e DM |
1550 | if (rt->dst.dev != dev) |
1551 | continue; | |
8d7017fd | 1552 | rt->dst.dev = blackhole_netdev; |
d62607c3 JK |
1553 | netdev_ref_replace(dev, blackhole_netdev, |
1554 | &rt->dst.dev_tracker, GFP_ATOMIC); | |
d288a162 | 1555 | list_move(&rt->dst.rt_uncached, &ul->quarantine); |
caacf05e | 1556 | } |
5055c371 | 1557 | spin_unlock_bh(&ul->lock); |
4895c771 DM |
1558 | } |
1559 | } | |
1560 | ||
4331debc | 1561 | static bool rt_cache_valid(const struct rtable *rt) |
d2d68ba9 | 1562 | { |
4331debc ED |
1563 | return rt && |
1564 | rt->dst.obsolete == DST_OBSOLETE_FORCE_CHK && | |
1565 | !rt_is_expired(rt); | |
d2d68ba9 DM |
1566 | } |
1567 | ||
f2bb4bed | 1568 | static void rt_set_nexthop(struct rtable *rt, __be32 daddr, |
5e2b61f7 | 1569 | const struct fib_result *res, |
f2bb4bed | 1570 | struct fib_nh_exception *fnhe, |
a4c2fd7f WW |
1571 | struct fib_info *fi, u16 type, u32 itag, |
1572 | const bool do_cache) | |
1da177e4 | 1573 | { |
caacf05e DM |
1574 | bool cached = false; |
1575 | ||
1da177e4 | 1576 | if (fi) { |
eba618ab | 1577 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
4895c771 | 1578 | |
0f5f7d7b | 1579 | if (nhc->nhc_gw_family && nhc->nhc_scope == RT_SCOPE_LINK) { |
77d5bc7e | 1580 | rt->rt_uses_gateway = 1; |
0f5f7d7b DA |
1581 | rt->rt_gw_family = nhc->nhc_gw_family; |
1582 | /* only INET and INET6 are supported */ | |
1583 | if (likely(nhc->nhc_gw_family == AF_INET)) | |
1584 | rt->rt_gw4 = nhc->nhc_gw.ipv4; | |
1585 | else | |
1586 | rt->rt_gw6 = nhc->nhc_gw.ipv6; | |
155e8336 | 1587 | } |
0f5f7d7b | 1588 | |
e1255ed4 DA |
1589 | ip_dst_init_metrics(&rt->dst, fi->fib_metrics); |
1590 | ||
c7066f70 | 1591 | #ifdef CONFIG_IP_ROUTE_CLASSID |
dcb1ecb5 | 1592 | if (nhc->nhc_family == AF_INET) { |
87063a1f DA |
1593 | struct fib_nh *nh; |
1594 | ||
1595 | nh = container_of(nhc, struct fib_nh, nh_common); | |
1596 | rt->dst.tclassid = nh->nh_tclassid; | |
1597 | } | |
1da177e4 | 1598 | #endif |
87063a1f | 1599 | rt->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
c5038a83 | 1600 | if (unlikely(fnhe)) |
a4c2fd7f WW |
1601 | cached = rt_bind_exception(rt, fnhe, daddr, do_cache); |
1602 | else if (do_cache) | |
87063a1f | 1603 | cached = rt_cache_route(nhc, rt); |
155e8336 JA |
1604 | if (unlikely(!cached)) { |
1605 | /* Routes we intend to cache in nexthop exception or | |
1606 | * FIB nexthop have the DST_NOCACHE bit clear. | |
1607 | * However, if we are unsuccessful at storing this | |
1608 | * route into the cache we really need to set it. | |
1609 | */ | |
1550c171 DA |
1610 | if (!rt->rt_gw4) { |
1611 | rt->rt_gw_family = AF_INET; | |
1612 | rt->rt_gw4 = daddr; | |
1613 | } | |
155e8336 JA |
1614 | rt_add_uncached_list(rt); |
1615 | } | |
1616 | } else | |
caacf05e | 1617 | rt_add_uncached_list(rt); |
defb3519 | 1618 | |
c7066f70 | 1619 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1da177e4 | 1620 | #ifdef CONFIG_IP_MULTIPLE_TABLES |
85b91b03 | 1621 | set_class_tag(rt, res->tclassid); |
1da177e4 LT |
1622 | #endif |
1623 | set_class_tag(rt, itag); | |
1624 | #endif | |
1da177e4 LT |
1625 | } |
1626 | ||
9ab179d8 DA |
1627 | struct rtable *rt_dst_alloc(struct net_device *dev, |
1628 | unsigned int flags, u16 type, | |
b5c8b3fe | 1629 | bool noxfrm) |
0c4dcd58 | 1630 | { |
d08c4f35 DA |
1631 | struct rtable *rt; |
1632 | ||
762c8dc7 | 1633 | rt = dst_alloc(&ipv4_dst_ops, dev, DST_OBSOLETE_FORCE_CHK, |
b2a9c0ed | 1634 | (noxfrm ? DST_NOXFRM : 0)); |
d08c4f35 DA |
1635 | |
1636 | if (rt) { | |
1637 | rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1638 | rt->rt_flags = flags; | |
1639 | rt->rt_type = type; | |
1640 | rt->rt_is_input = 0; | |
1641 | rt->rt_iif = 0; | |
1642 | rt->rt_pmtu = 0; | |
d52e5a7e | 1643 | rt->rt_mtu_locked = 0; |
77d5bc7e | 1644 | rt->rt_uses_gateway = 0; |
1550c171 DA |
1645 | rt->rt_gw_family = 0; |
1646 | rt->rt_gw4 = 0; | |
d08c4f35 DA |
1647 | |
1648 | rt->dst.output = ip_output; | |
1649 | if (flags & RTCF_LOCAL) | |
1650 | rt->dst.input = ip_local_deliver; | |
1651 | } | |
1652 | ||
1653 | return rt; | |
0c4dcd58 | 1654 | } |
9ab179d8 | 1655 | EXPORT_SYMBOL(rt_dst_alloc); |
0c4dcd58 | 1656 | |
5b18f128 SS |
1657 | struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt) |
1658 | { | |
1659 | struct rtable *new_rt; | |
1660 | ||
762c8dc7 | 1661 | new_rt = dst_alloc(&ipv4_dst_ops, dev, DST_OBSOLETE_FORCE_CHK, |
5b18f128 SS |
1662 | rt->dst.flags); |
1663 | ||
1664 | if (new_rt) { | |
1665 | new_rt->rt_genid = rt_genid_ipv4(dev_net(dev)); | |
1666 | new_rt->rt_flags = rt->rt_flags; | |
1667 | new_rt->rt_type = rt->rt_type; | |
1668 | new_rt->rt_is_input = rt->rt_is_input; | |
1669 | new_rt->rt_iif = rt->rt_iif; | |
1670 | new_rt->rt_pmtu = rt->rt_pmtu; | |
1671 | new_rt->rt_mtu_locked = rt->rt_mtu_locked; | |
1672 | new_rt->rt_gw_family = rt->rt_gw_family; | |
1673 | if (rt->rt_gw_family == AF_INET) | |
1674 | new_rt->rt_gw4 = rt->rt_gw4; | |
1675 | else if (rt->rt_gw_family == AF_INET6) | |
1676 | new_rt->rt_gw6 = rt->rt_gw6; | |
5b18f128 | 1677 | |
5b18f128 SS |
1678 | new_rt->dst.input = rt->dst.input; |
1679 | new_rt->dst.output = rt->dst.output; | |
1680 | new_rt->dst.error = rt->dst.error; | |
1681 | new_rt->dst.lastuse = jiffies; | |
1682 | new_rt->dst.lwtstate = lwtstate_get(rt->dst.lwtstate); | |
1683 | } | |
1684 | return new_rt; | |
1685 | } | |
1686 | EXPORT_SYMBOL(rt_dst_clone); | |
1687 | ||
96d36220 | 1688 | /* called in rcu_read_lock() section */ |
bc044e8d PA |
1689 | int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
1690 | u8 tos, struct net_device *dev, | |
1691 | struct in_device *in_dev, u32 *itag) | |
1da177e4 | 1692 | { |
b5f7e755 | 1693 | int err; |
1da177e4 LT |
1694 | |
1695 | /* Primary sanity checks. */ | |
51456b29 | 1696 | if (!in_dev) |
1da177e4 LT |
1697 | return -EINVAL; |
1698 | ||
1e637c74 | 1699 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr) || |
d0daebc3 | 1700 | skb->protocol != htons(ETH_P_IP)) |
bc044e8d | 1701 | return -EINVAL; |
1da177e4 | 1702 | |
75fea73d | 1703 | if (ipv4_is_loopback(saddr) && !IN_DEV_ROUTE_LOCALNET(in_dev)) |
bc044e8d | 1704 | return -EINVAL; |
d0daebc3 | 1705 | |
f97c1e0c | 1706 | if (ipv4_is_zeronet(saddr)) { |
1d2f4ebb EC |
1707 | if (!ipv4_is_local_multicast(daddr) && |
1708 | ip_hdr(skb)->protocol != IPPROTO_IGMP) | |
bc044e8d | 1709 | return -EINVAL; |
b5f7e755 | 1710 | } else { |
9e56e380 | 1711 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
bc044e8d | 1712 | in_dev, itag); |
b5f7e755 | 1713 | if (err < 0) |
bc044e8d | 1714 | return err; |
b5f7e755 | 1715 | } |
bc044e8d PA |
1716 | return 0; |
1717 | } | |
1718 | ||
1719 | /* called in rcu_read_lock() section */ | |
1720 | static int ip_route_input_mc(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
1721 | u8 tos, struct net_device *dev, int our) | |
1722 | { | |
1723 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
1724 | unsigned int flags = RTCF_MULTICAST; | |
1725 | struct rtable *rth; | |
1726 | u32 itag = 0; | |
1727 | int err; | |
1728 | ||
1729 | err = ip_mc_validate_source(skb, daddr, saddr, tos, dev, in_dev, &itag); | |
1730 | if (err) | |
1731 | return err; | |
1732 | ||
d08c4f35 DA |
1733 | if (our) |
1734 | flags |= RTCF_LOCAL; | |
1735 | ||
b5c8b3fe | 1736 | if (IN_DEV_ORCONF(in_dev, NOPOLICY)) |
e6175a2e EB |
1737 | IPCB(skb)->flags |= IPSKB_NOPOLICY; |
1738 | ||
d08c4f35 | 1739 | rth = rt_dst_alloc(dev_net(dev)->loopback_dev, flags, RTN_MULTICAST, |
b5c8b3fe | 1740 | false); |
1da177e4 | 1741 | if (!rth) |
bc044e8d | 1742 | return -ENOBUFS; |
1da177e4 | 1743 | |
cf911662 DM |
1744 | #ifdef CONFIG_IP_ROUTE_CLASSID |
1745 | rth->dst.tclassid = itag; | |
1746 | #endif | |
d8d1f30b | 1747 | rth->dst.output = ip_rt_bug; |
9917e1e8 | 1748 | rth->rt_is_input= 1; |
1da177e4 LT |
1749 | |
1750 | #ifdef CONFIG_IP_MROUTE | |
f97c1e0c | 1751 | if (!ipv4_is_local_multicast(daddr) && IN_DEV_MFORWARD(in_dev)) |
d8d1f30b | 1752 | rth->dst.input = ip_mr_input; |
1da177e4 LT |
1753 | #endif |
1754 | RT_CACHE_STAT_INC(in_slow_mc); | |
1755 | ||
9e6c6d17 | 1756 | skb_dst_drop(skb); |
89aef892 DM |
1757 | skb_dst_set(skb, &rth->dst); |
1758 | return 0; | |
1da177e4 LT |
1759 | } |
1760 | ||
1761 | ||
1762 | static void ip_handle_martian_source(struct net_device *dev, | |
1763 | struct in_device *in_dev, | |
1764 | struct sk_buff *skb, | |
9e12bb22 AV |
1765 | __be32 daddr, |
1766 | __be32 saddr) | |
1da177e4 LT |
1767 | { |
1768 | RT_CACHE_STAT_INC(in_martian_src); | |
1769 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
1770 | if (IN_DEV_LOG_MARTIANS(in_dev) && net_ratelimit()) { | |
1771 | /* | |
1772 | * RFC1812 recommendation, if source is martian, | |
1773 | * the only hint is MAC header. | |
1774 | */ | |
058bd4d2 | 1775 | pr_warn("martian source %pI4 from %pI4, on dev %s\n", |
673d57e7 | 1776 | &daddr, &saddr, dev->name); |
98e399f8 | 1777 | if (dev->hard_header_len && skb_mac_header_was_set(skb)) { |
058bd4d2 JP |
1778 | print_hex_dump(KERN_WARNING, "ll header: ", |
1779 | DUMP_PREFIX_OFFSET, 16, 1, | |
1780 | skb_mac_header(skb), | |
b2c85100 | 1781 | dev->hard_header_len, false); |
1da177e4 LT |
1782 | } |
1783 | } | |
1784 | #endif | |
1785 | } | |
1786 | ||
47360228 | 1787 | /* called in rcu_read_lock() section */ |
5969f71d | 1788 | static int __mkroute_input(struct sk_buff *skb, |
982721f3 | 1789 | const struct fib_result *res, |
5969f71d | 1790 | struct in_device *in_dev, |
c6cffba4 | 1791 | __be32 daddr, __be32 saddr, u32 tos) |
1da177e4 | 1792 | { |
eba618ab DA |
1793 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
1794 | struct net_device *dev = nhc->nhc_dev; | |
2ffae99d | 1795 | struct fib_nh_exception *fnhe; |
1da177e4 LT |
1796 | struct rtable *rth; |
1797 | int err; | |
1798 | struct in_device *out_dev; | |
b5c8b3fe | 1799 | bool do_cache; |
fbdc0ad0 | 1800 | u32 itag = 0; |
1da177e4 LT |
1801 | |
1802 | /* get a working reference to the output device */ | |
eba618ab | 1803 | out_dev = __in_dev_get_rcu(dev); |
51456b29 | 1804 | if (!out_dev) { |
e87cc472 | 1805 | net_crit_ratelimited("Bug in ip_route_input_slow(). Please report.\n"); |
1da177e4 LT |
1806 | return -EINVAL; |
1807 | } | |
1808 | ||
5c04c819 | 1809 | err = fib_validate_source(skb, saddr, daddr, tos, FIB_RES_OIF(*res), |
9e56e380 | 1810 | in_dev->dev, in_dev, &itag); |
1da177e4 | 1811 | if (err < 0) { |
e905a9ed | 1812 | ip_handle_martian_source(in_dev->dev, in_dev, skb, daddr, |
1da177e4 | 1813 | saddr); |
e905a9ed | 1814 | |
1da177e4 LT |
1815 | goto cleanup; |
1816 | } | |
1817 | ||
e81da0e1 JA |
1818 | do_cache = res->fi && !itag; |
1819 | if (out_dev == in_dev && err && IN_DEV_TX_REDIRECTS(out_dev) && | |
eba618ab | 1820 | skb->protocol == htons(ETH_P_IP)) { |
bdf00467 | 1821 | __be32 gw; |
eba618ab | 1822 | |
bdf00467 | 1823 | gw = nhc->nhc_gw_family == AF_INET ? nhc->nhc_gw.ipv4 : 0; |
eba618ab DA |
1824 | if (IN_DEV_SHARED_MEDIA(out_dev) || |
1825 | inet_addr_onlink(out_dev, saddr, gw)) | |
1826 | IPCB(skb)->flags |= IPSKB_DOREDIRECT; | |
1827 | } | |
1da177e4 LT |
1828 | |
1829 | if (skb->protocol != htons(ETH_P_IP)) { | |
1830 | /* Not IP (i.e. ARP). Do not create route, if it is | |
1831 | * invalid for proxy arp. DNAT routes are always valid. | |
65324144 JDB |
1832 | * |
1833 | * Proxy arp feature have been extended to allow, ARP | |
1834 | * replies back to the same interface, to support | |
1835 | * Private VLAN switch technologies. See arp.c. | |
1da177e4 | 1836 | */ |
65324144 JDB |
1837 | if (out_dev == in_dev && |
1838 | IN_DEV_PROXY_ARP_PVLAN(in_dev) == 0) { | |
1da177e4 LT |
1839 | err = -EINVAL; |
1840 | goto cleanup; | |
1841 | } | |
1842 | } | |
1843 | ||
b5c8b3fe | 1844 | if (IN_DEV_ORCONF(in_dev, NOPOLICY)) |
e6175a2e EB |
1845 | IPCB(skb)->flags |= IPSKB_NOPOLICY; |
1846 | ||
a5995e71 | 1847 | fnhe = find_exception(nhc, daddr); |
e81da0e1 | 1848 | if (do_cache) { |
94720e3a | 1849 | if (fnhe) |
2ffae99d | 1850 | rth = rcu_dereference(fnhe->fnhe_rth_input); |
94720e3a | 1851 | else |
0f457a36 | 1852 | rth = rcu_dereference(nhc->nhc_rth_input); |
e81da0e1 JA |
1853 | if (rt_cache_valid(rth)) { |
1854 | skb_dst_set_noref(skb, &rth->dst); | |
1855 | goto out; | |
d2d68ba9 DM |
1856 | } |
1857 | } | |
f2bb4bed | 1858 | |
b5c8b3fe | 1859 | rth = rt_dst_alloc(out_dev->dev, 0, res->type, |
62679a8d | 1860 | IN_DEV_ORCONF(out_dev, NOXFRM)); |
1da177e4 LT |
1861 | if (!rth) { |
1862 | err = -ENOBUFS; | |
1863 | goto cleanup; | |
1864 | } | |
1865 | ||
9917e1e8 | 1866 | rth->rt_is_input = 1; |
a6254864 | 1867 | RT_CACHE_STAT_INC(in_slow_tot); |
1da177e4 | 1868 | |
d8d1f30b | 1869 | rth->dst.input = ip_forward; |
1da177e4 | 1870 | |
a4c2fd7f WW |
1871 | rt_set_nexthop(rth, daddr, res, fnhe, res->fi, res->type, itag, |
1872 | do_cache); | |
9942895b | 1873 | lwtunnel_set_redirect(&rth->dst); |
c6cffba4 | 1874 | skb_dst_set(skb, &rth->dst); |
d2d68ba9 | 1875 | out: |
1da177e4 LT |
1876 | err = 0; |
1877 | cleanup: | |
1da177e4 | 1878 | return err; |
e905a9ed | 1879 | } |
1da177e4 | 1880 | |
79a13159 | 1881 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
79a13159 | 1882 | /* To make ICMP packets follow the right flow, the multipath hash is |
bf4e0a3d | 1883 | * calculated from the inner IP addresses. |
79a13159 | 1884 | */ |
bf4e0a3d NA |
1885 | static void ip_multipath_l3_keys(const struct sk_buff *skb, |
1886 | struct flow_keys *hash_keys) | |
79a13159 PN |
1887 | { |
1888 | const struct iphdr *outer_iph = ip_hdr(skb); | |
6f74b6c2 | 1889 | const struct iphdr *key_iph = outer_iph; |
bf4e0a3d | 1890 | const struct iphdr *inner_iph; |
79a13159 PN |
1891 | const struct icmphdr *icmph; |
1892 | struct iphdr _inner_iph; | |
bf4e0a3d NA |
1893 | struct icmphdr _icmph; |
1894 | ||
bf4e0a3d | 1895 | if (likely(outer_iph->protocol != IPPROTO_ICMP)) |
6f74b6c2 | 1896 | goto out; |
79a13159 PN |
1897 | |
1898 | if (unlikely((outer_iph->frag_off & htons(IP_OFFSET)) != 0)) | |
6f74b6c2 | 1899 | goto out; |
79a13159 PN |
1900 | |
1901 | icmph = skb_header_pointer(skb, outer_iph->ihl * 4, sizeof(_icmph), | |
1902 | &_icmph); | |
1903 | if (!icmph) | |
6f74b6c2 | 1904 | goto out; |
79a13159 | 1905 | |
54074f1d | 1906 | if (!icmp_is_err(icmph->type)) |
6f74b6c2 | 1907 | goto out; |
79a13159 PN |
1908 | |
1909 | inner_iph = skb_header_pointer(skb, | |
1910 | outer_iph->ihl * 4 + sizeof(_icmph), | |
1911 | sizeof(_inner_iph), &_inner_iph); | |
1912 | if (!inner_iph) | |
6f74b6c2 DA |
1913 | goto out; |
1914 | ||
1915 | key_iph = inner_iph; | |
1916 | out: | |
1917 | hash_keys->addrs.v4addrs.src = key_iph->saddr; | |
1918 | hash_keys->addrs.v4addrs.dst = key_iph->daddr; | |
bf4e0a3d | 1919 | } |
79a13159 | 1920 | |
4253b498 IS |
1921 | static u32 fib_multipath_custom_hash_outer(const struct net *net, |
1922 | const struct sk_buff *skb, | |
1923 | bool *p_has_inner) | |
1924 | { | |
8895a9c2 | 1925 | u32 hash_fields = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_fields); |
4253b498 IS |
1926 | struct flow_keys keys, hash_keys; |
1927 | ||
1928 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
1929 | return 0; | |
1930 | ||
1931 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1932 | skb_flow_dissect_flow_keys(skb, &keys, FLOW_DISSECTOR_F_STOP_AT_ENCAP); | |
1933 | ||
1934 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1935 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
1936 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
1937 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
1938 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1939 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
1940 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1941 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
1942 | hash_keys.ports.src = keys.ports.src; | |
1943 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
1944 | hash_keys.ports.dst = keys.ports.dst; | |
1945 | ||
1946 | *p_has_inner = !!(keys.control.flags & FLOW_DIS_ENCAPSULATION); | |
1947 | return flow_hash_from_keys(&hash_keys); | |
1948 | } | |
1949 | ||
1950 | static u32 fib_multipath_custom_hash_inner(const struct net *net, | |
1951 | const struct sk_buff *skb, | |
1952 | bool has_inner) | |
1953 | { | |
8895a9c2 | 1954 | u32 hash_fields = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_fields); |
4253b498 IS |
1955 | struct flow_keys keys, hash_keys; |
1956 | ||
1957 | /* We assume the packet carries an encapsulation, but if none was | |
1958 | * encountered during dissection of the outer flow, then there is no | |
1959 | * point in calling the flow dissector again. | |
1960 | */ | |
1961 | if (!has_inner) | |
1962 | return 0; | |
1963 | ||
1964 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_MASK)) | |
1965 | return 0; | |
1966 | ||
1967 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
1968 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
1969 | ||
1970 | if (!(keys.control.flags & FLOW_DIS_ENCAPSULATION)) | |
1971 | return 0; | |
1972 | ||
1973 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
1974 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
1975 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
1976 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
1977 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
1978 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
1979 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
1980 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
1981 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_IP) | |
1982 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
1983 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_IP) | |
1984 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
1985 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_FLOWLABEL) | |
1986 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
1987 | } | |
1988 | ||
1989 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_IP_PROTO) | |
1990 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
1991 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_SRC_PORT) | |
1992 | hash_keys.ports.src = keys.ports.src; | |
1993 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_INNER_DST_PORT) | |
1994 | hash_keys.ports.dst = keys.ports.dst; | |
1995 | ||
1996 | return flow_hash_from_keys(&hash_keys); | |
1997 | } | |
1998 | ||
1999 | static u32 fib_multipath_custom_hash_skb(const struct net *net, | |
2000 | const struct sk_buff *skb) | |
2001 | { | |
2002 | u32 mhash, mhash_inner; | |
2003 | bool has_inner = true; | |
2004 | ||
2005 | mhash = fib_multipath_custom_hash_outer(net, skb, &has_inner); | |
2006 | mhash_inner = fib_multipath_custom_hash_inner(net, skb, has_inner); | |
2007 | ||
2008 | return jhash_2words(mhash, mhash_inner, 0); | |
2009 | } | |
2010 | ||
2011 | static u32 fib_multipath_custom_hash_fl4(const struct net *net, | |
2012 | const struct flowi4 *fl4) | |
2013 | { | |
8895a9c2 | 2014 | u32 hash_fields = READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_fields); |
4253b498 IS |
2015 | struct flow_keys hash_keys; |
2016 | ||
2017 | if (!(hash_fields & FIB_MULTIPATH_HASH_FIELD_OUTER_MASK)) | |
2018 | return 0; | |
2019 | ||
2020 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2021 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2022 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_IP) | |
2023 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
2024 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_IP) | |
2025 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
2026 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_IP_PROTO) | |
2027 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
2028 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_SRC_PORT) | |
2029 | hash_keys.ports.src = fl4->fl4_sport; | |
2030 | if (hash_fields & FIB_MULTIPATH_HASH_FIELD_DST_PORT) | |
2031 | hash_keys.ports.dst = fl4->fl4_dport; | |
2032 | ||
2033 | return flow_hash_from_keys(&hash_keys); | |
2034 | } | |
2035 | ||
bf4e0a3d | 2036 | /* if skb is set it will be used and fl4 can be NULL */ |
7efc0b6b | 2037 | int fib_multipath_hash(const struct net *net, const struct flowi4 *fl4, |
e37b1e97 | 2038 | const struct sk_buff *skb, struct flow_keys *flkeys) |
bf4e0a3d | 2039 | { |
2a8e4997 | 2040 | u32 multipath_hash = fl4 ? fl4->flowi4_multipath_hash : 0; |
bf4e0a3d | 2041 | struct flow_keys hash_keys; |
2e68ea92 | 2042 | u32 mhash = 0; |
79a13159 | 2043 | |
7998c12a | 2044 | switch (READ_ONCE(net->ipv4.sysctl_fib_multipath_hash_policy)) { |
bf4e0a3d NA |
2045 | case 0: |
2046 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2047 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2048 | if (skb) { | |
2049 | ip_multipath_l3_keys(skb, &hash_keys); | |
2050 | } else { | |
2051 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
2052 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
2053 | } | |
2e68ea92 | 2054 | mhash = flow_hash_from_keys(&hash_keys); |
bf4e0a3d NA |
2055 | break; |
2056 | case 1: | |
2057 | /* skb is currently provided only when forwarding */ | |
2058 | if (skb) { | |
2059 | unsigned int flag = FLOW_DISSECTOR_F_STOP_AT_ENCAP; | |
2060 | struct flow_keys keys; | |
2061 | ||
2062 | /* short-circuit if we already have L4 hash present */ | |
2063 | if (skb->l4_hash) | |
2064 | return skb_get_hash_raw(skb) >> 1; | |
ec7127a5 | 2065 | |
bf4e0a3d | 2066 | memset(&hash_keys, 0, sizeof(hash_keys)); |
1fe4b118 | 2067 | |
ec7127a5 | 2068 | if (!flkeys) { |
e37b1e97 | 2069 | skb_flow_dissect_flow_keys(skb, &keys, flag); |
ec7127a5 | 2070 | flkeys = &keys; |
e37b1e97 | 2071 | } |
ec7127a5 DA |
2072 | |
2073 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2074 | hash_keys.addrs.v4addrs.src = flkeys->addrs.v4addrs.src; | |
2075 | hash_keys.addrs.v4addrs.dst = flkeys->addrs.v4addrs.dst; | |
2076 | hash_keys.ports.src = flkeys->ports.src; | |
2077 | hash_keys.ports.dst = flkeys->ports.dst; | |
2078 | hash_keys.basic.ip_proto = flkeys->basic.ip_proto; | |
bf4e0a3d NA |
2079 | } else { |
2080 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
2081 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2082 | hash_keys.addrs.v4addrs.src = fl4->saddr; | |
2083 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
2084 | hash_keys.ports.src = fl4->fl4_sport; | |
2085 | hash_keys.ports.dst = fl4->fl4_dport; | |
2086 | hash_keys.basic.ip_proto = fl4->flowi4_proto; | |
2087 | } | |
2e68ea92 | 2088 | mhash = flow_hash_from_keys(&hash_keys); |
bf4e0a3d | 2089 | break; |
363887a2 SS |
2090 | case 2: |
2091 | memset(&hash_keys, 0, sizeof(hash_keys)); | |
363887a2 SS |
2092 | /* skb is currently provided only when forwarding */ |
2093 | if (skb) { | |
2094 | struct flow_keys keys; | |
2095 | ||
2096 | skb_flow_dissect_flow_keys(skb, &keys, 0); | |
828b2b44 SS |
2097 | /* Inner can be v4 or v6 */ |
2098 | if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV4_ADDRS) { | |
2099 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2100 | hash_keys.addrs.v4addrs.src = keys.addrs.v4addrs.src; | |
2101 | hash_keys.addrs.v4addrs.dst = keys.addrs.v4addrs.dst; | |
2102 | } else if (keys.control.addr_type == FLOW_DISSECTOR_KEY_IPV6_ADDRS) { | |
2103 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV6_ADDRS; | |
2104 | hash_keys.addrs.v6addrs.src = keys.addrs.v6addrs.src; | |
2105 | hash_keys.addrs.v6addrs.dst = keys.addrs.v6addrs.dst; | |
2106 | hash_keys.tags.flow_label = keys.tags.flow_label; | |
2107 | hash_keys.basic.ip_proto = keys.basic.ip_proto; | |
2108 | } else { | |
2109 | /* Same as case 0 */ | |
2110 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; | |
2111 | ip_multipath_l3_keys(skb, &hash_keys); | |
2112 | } | |
363887a2 SS |
2113 | } else { |
2114 | /* Same as case 0 */ | |
828b2b44 | 2115 | hash_keys.control.addr_type = FLOW_DISSECTOR_KEY_IPV4_ADDRS; |
363887a2 SS |
2116 | hash_keys.addrs.v4addrs.src = fl4->saddr; |
2117 | hash_keys.addrs.v4addrs.dst = fl4->daddr; | |
2118 | } | |
2e68ea92 | 2119 | mhash = flow_hash_from_keys(&hash_keys); |
363887a2 | 2120 | break; |
4253b498 IS |
2121 | case 3: |
2122 | if (skb) | |
2123 | mhash = fib_multipath_custom_hash_skb(net, skb); | |
2124 | else | |
2125 | mhash = fib_multipath_custom_hash_fl4(net, fl4); | |
2126 | break; | |
bf4e0a3d | 2127 | } |
79a13159 | 2128 | |
24ba1440 | 2129 | if (multipath_hash) |
2130 | mhash = jhash_2words(mhash, multipath_hash, 0); | |
2131 | ||
bf4e0a3d NA |
2132 | return mhash >> 1; |
2133 | } | |
79a13159 PN |
2134 | #endif /* CONFIG_IP_ROUTE_MULTIPATH */ |
2135 | ||
5969f71d SH |
2136 | static int ip_mkroute_input(struct sk_buff *skb, |
2137 | struct fib_result *res, | |
5969f71d | 2138 | struct in_device *in_dev, |
e37b1e97 RP |
2139 | __be32 daddr, __be32 saddr, u32 tos, |
2140 | struct flow_keys *hkeys) | |
1da177e4 | 2141 | { |
1da177e4 | 2142 | #ifdef CONFIG_IP_ROUTE_MULTIPATH |
5481d73f | 2143 | if (res->fi && fib_info_num_path(res->fi) > 1) { |
7efc0b6b | 2144 | int h = fib_multipath_hash(res->fi->fib_net, NULL, skb, hkeys); |
0e884c78 | 2145 | |
0e884c78 | 2146 | fib_select_multipath(res, h); |
6ac66cb0 | 2147 | IPCB(skb)->flags |= IPSKB_MULTIPATH; |
0e884c78 | 2148 | } |
1da177e4 LT |
2149 | #endif |
2150 | ||
2151 | /* create a routing cache entry */ | |
c6cffba4 | 2152 | return __mkroute_input(skb, res, in_dev, daddr, saddr, tos); |
1da177e4 LT |
2153 | } |
2154 | ||
02b24941 PA |
2155 | /* Implements all the saddr-related checks as ip_route_input_slow(), |
2156 | * assuming daddr is valid and the destination is not a local broadcast one. | |
2157 | * Uses the provided hint instead of performing a route lookup. | |
2158 | */ | |
2159 | int ip_route_use_hint(struct sk_buff *skb, __be32 daddr, __be32 saddr, | |
2160 | u8 tos, struct net_device *dev, | |
2161 | const struct sk_buff *hint) | |
2162 | { | |
2163 | struct in_device *in_dev = __in_dev_get_rcu(dev); | |
2ce578ca | 2164 | struct rtable *rt = skb_rtable(hint); |
02b24941 PA |
2165 | struct net *net = dev_net(dev); |
2166 | int err = -EINVAL; | |
2167 | u32 tag = 0; | |
2168 | ||
2169 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) | |
2170 | goto martian_source; | |
2171 | ||
2172 | if (ipv4_is_zeronet(saddr)) | |
2173 | goto martian_source; | |
2174 | ||
2175 | if (ipv4_is_loopback(saddr) && !IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
2176 | goto martian_source; | |
2177 | ||
2178 | if (rt->rt_type != RTN_LOCAL) | |
2179 | goto skip_validate_source; | |
2180 | ||
2181 | tos &= IPTOS_RT_MASK; | |
2182 | err = fib_validate_source(skb, saddr, daddr, tos, 0, dev, in_dev, &tag); | |
2183 | if (err < 0) | |
2184 | goto martian_source; | |
2185 | ||
2186 | skip_validate_source: | |
2187 | skb_dst_copy(skb, hint); | |
2188 | return 0; | |
2189 | ||
2190 | martian_source: | |
2191 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
2192 | return err; | |
2193 | } | |
2194 | ||
b87b04f5 DA |
2195 | /* get device for dst_alloc with local routes */ |
2196 | static struct net_device *ip_rt_get_dev(struct net *net, | |
2197 | const struct fib_result *res) | |
2198 | { | |
2199 | struct fib_nh_common *nhc = res->fi ? res->nhc : NULL; | |
2200 | struct net_device *dev = NULL; | |
2201 | ||
2202 | if (nhc) | |
2203 | dev = l3mdev_master_dev_rcu(nhc->nhc_dev); | |
2204 | ||
2205 | return dev ? : net->loopback_dev; | |
2206 | } | |
2207 | ||
1da177e4 LT |
2208 | /* |
2209 | * NOTE. We drop all the packets that has local source | |
2210 | * addresses, because every properly looped back packet | |
2211 | * must have correct destination already attached by output routine. | |
02b24941 PA |
2212 | * Changes in the enforced policies must be applied also to |
2213 | * ip_route_use_hint(). | |
1da177e4 LT |
2214 | * |
2215 | * Such approach solves two big problems: | |
2216 | * 1. Not simplex devices are handled properly. | |
2217 | * 2. IP spoofing attempts are filtered with 100% of guarantee. | |
ebc0ffae | 2218 | * called with rcu_read_lock() |
1da177e4 LT |
2219 | */ |
2220 | ||
9e12bb22 | 2221 | static int ip_route_input_slow(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
5510cdf7 DA |
2222 | u8 tos, struct net_device *dev, |
2223 | struct fib_result *res) | |
1da177e4 | 2224 | { |
96d36220 | 2225 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e37b1e97 RP |
2226 | struct flow_keys *flkeys = NULL, _flkeys; |
2227 | struct net *net = dev_net(dev); | |
1b7179d3 | 2228 | struct ip_tunnel_info *tun_info; |
e37b1e97 | 2229 | int err = -EINVAL; |
95c96174 | 2230 | unsigned int flags = 0; |
1da177e4 | 2231 | u32 itag = 0; |
95c96174 | 2232 | struct rtable *rth; |
e37b1e97 | 2233 | struct flowi4 fl4; |
0a90478b | 2234 | bool do_cache = true; |
1da177e4 LT |
2235 | |
2236 | /* IP on this device is disabled. */ | |
2237 | ||
2238 | if (!in_dev) | |
2239 | goto out; | |
2240 | ||
2241 | /* Check for the most weird martians, which can be not detected | |
6ad08600 | 2242 | * by fib_lookup. |
1da177e4 LT |
2243 | */ |
2244 | ||
61adedf3 | 2245 | tun_info = skb_tunnel_info(skb); |
46fa062a | 2246 | if (tun_info && !(tun_info->mode & IP_TUNNEL_INFO_TX)) |
1b7179d3 TG |
2247 | fl4.flowi4_tun_key.tun_id = tun_info->key.tun_id; |
2248 | else | |
2249 | fl4.flowi4_tun_key.tun_id = 0; | |
f38a9eb1 TG |
2250 | skb_dst_drop(skb); |
2251 | ||
d0daebc3 | 2252 | if (ipv4_is_multicast(saddr) || ipv4_is_lbcast(saddr)) |
1da177e4 LT |
2253 | goto martian_source; |
2254 | ||
5510cdf7 DA |
2255 | res->fi = NULL; |
2256 | res->table = NULL; | |
27a954bd | 2257 | if (ipv4_is_lbcast(daddr) || (saddr == 0 && daddr == 0)) |
1da177e4 LT |
2258 | goto brd_input; |
2259 | ||
2260 | /* Accept zero addresses only to limited broadcast; | |
2261 | * I even do not know to fix it or not. Waiting for complains :-) | |
2262 | */ | |
f97c1e0c | 2263 | if (ipv4_is_zeronet(saddr)) |
1da177e4 LT |
2264 | goto martian_source; |
2265 | ||
d0daebc3 | 2266 | if (ipv4_is_zeronet(daddr)) |
1da177e4 LT |
2267 | goto martian_destination; |
2268 | ||
9eb43e76 ED |
2269 | /* Following code try to avoid calling IN_DEV_NET_ROUTE_LOCALNET(), |
2270 | * and call it once if daddr or/and saddr are loopback addresses | |
2271 | */ | |
2272 | if (ipv4_is_loopback(daddr)) { | |
2273 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 | 2274 | goto martian_destination; |
9eb43e76 ED |
2275 | } else if (ipv4_is_loopback(saddr)) { |
2276 | if (!IN_DEV_NET_ROUTE_LOCALNET(in_dev, net)) | |
d0daebc3 TG |
2277 | goto martian_source; |
2278 | } | |
2279 | ||
1da177e4 LT |
2280 | /* |
2281 | * Now we are ready to route packet. | |
2282 | */ | |
40867d74 | 2283 | fl4.flowi4_l3mdev = 0; |
68a5e3dd | 2284 | fl4.flowi4_oif = 0; |
e0d56fdd | 2285 | fl4.flowi4_iif = dev->ifindex; |
68a5e3dd DM |
2286 | fl4.flowi4_mark = skb->mark; |
2287 | fl4.flowi4_tos = tos; | |
2288 | fl4.flowi4_scope = RT_SCOPE_UNIVERSE; | |
b84f7878 | 2289 | fl4.flowi4_flags = 0; |
68a5e3dd DM |
2290 | fl4.daddr = daddr; |
2291 | fl4.saddr = saddr; | |
8bcfd092 | 2292 | fl4.flowi4_uid = sock_net_uid(net, NULL); |
1869e226 | 2293 | fl4.flowi4_multipath_hash = 0; |
e37b1e97 | 2294 | |
5a847a6e | 2295 | if (fib4_rules_early_flow_dissect(net, skb, &fl4, &_flkeys)) { |
e37b1e97 | 2296 | flkeys = &_flkeys; |
5a847a6e DA |
2297 | } else { |
2298 | fl4.flowi4_proto = 0; | |
2299 | fl4.fl4_sport = 0; | |
2300 | fl4.fl4_dport = 0; | |
2301 | } | |
e37b1e97 | 2302 | |
5510cdf7 | 2303 | err = fib_lookup(net, &fl4, res, 0); |
cd0f0b95 DJ |
2304 | if (err != 0) { |
2305 | if (!IN_DEV_FORWARD(in_dev)) | |
2306 | err = -EHOSTUNREACH; | |
1da177e4 | 2307 | goto no_route; |
cd0f0b95 | 2308 | } |
1da177e4 | 2309 | |
5cbf777c XL |
2310 | if (res->type == RTN_BROADCAST) { |
2311 | if (IN_DEV_BFORWARD(in_dev)) | |
2312 | goto make_route; | |
0a90478b | 2313 | /* not do cache if bc_forwarding is enabled */ |
0598f8f3 | 2314 | if (IPV4_DEVCONF_ALL_RO(net, BC_FORWARDING)) |
0a90478b | 2315 | do_cache = false; |
1da177e4 | 2316 | goto brd_input; |
5cbf777c | 2317 | } |
1da177e4 | 2318 | |
5510cdf7 | 2319 | if (res->type == RTN_LOCAL) { |
5c04c819 | 2320 | err = fib_validate_source(skb, saddr, daddr, tos, |
0d5edc68 | 2321 | 0, dev, in_dev, &itag); |
b5f7e755 | 2322 | if (err < 0) |
0d753960 | 2323 | goto martian_source; |
1da177e4 LT |
2324 | goto local_input; |
2325 | } | |
2326 | ||
cd0f0b95 DJ |
2327 | if (!IN_DEV_FORWARD(in_dev)) { |
2328 | err = -EHOSTUNREACH; | |
251da413 | 2329 | goto no_route; |
cd0f0b95 | 2330 | } |
5510cdf7 | 2331 | if (res->type != RTN_UNICAST) |
1da177e4 LT |
2332 | goto martian_destination; |
2333 | ||
5cbf777c | 2334 | make_route: |
e37b1e97 | 2335 | err = ip_mkroute_input(skb, res, in_dev, daddr, saddr, tos, flkeys); |
1da177e4 LT |
2336 | out: return err; |
2337 | ||
2338 | brd_input: | |
2339 | if (skb->protocol != htons(ETH_P_IP)) | |
2340 | goto e_inval; | |
2341 | ||
41347dcd | 2342 | if (!ipv4_is_zeronet(saddr)) { |
9e56e380 DM |
2343 | err = fib_validate_source(skb, saddr, 0, tos, 0, dev, |
2344 | in_dev, &itag); | |
1da177e4 | 2345 | if (err < 0) |
0d753960 | 2346 | goto martian_source; |
1da177e4 LT |
2347 | } |
2348 | flags |= RTCF_BROADCAST; | |
5510cdf7 | 2349 | res->type = RTN_BROADCAST; |
1da177e4 LT |
2350 | RT_CACHE_STAT_INC(in_brd); |
2351 | ||
2352 | local_input: | |
b5c8b3fe | 2353 | if (IN_DEV_ORCONF(in_dev, NOPOLICY)) |
e6175a2e EB |
2354 | IPCB(skb)->flags |= IPSKB_NOPOLICY; |
2355 | ||
0a90478b XL |
2356 | do_cache &= res->fi && !itag; |
2357 | if (do_cache) { | |
2358 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); | |
eba618ab | 2359 | |
0a90478b XL |
2360 | rth = rcu_dereference(nhc->nhc_rth_input); |
2361 | if (rt_cache_valid(rth)) { | |
2362 | skb_dst_set_noref(skb, &rth->dst); | |
2363 | err = 0; | |
2364 | goto out; | |
d2d68ba9 DM |
2365 | } |
2366 | } | |
2367 | ||
b87b04f5 | 2368 | rth = rt_dst_alloc(ip_rt_get_dev(net, res), |
b5c8b3fe | 2369 | flags | RTCF_LOCAL, res->type, false); |
1da177e4 LT |
2370 | if (!rth) |
2371 | goto e_nobufs; | |
2372 | ||
d8d1f30b | 2373 | rth->dst.output= ip_rt_bug; |
cf911662 DM |
2374 | #ifdef CONFIG_IP_ROUTE_CLASSID |
2375 | rth->dst.tclassid = itag; | |
2376 | #endif | |
9917e1e8 | 2377 | rth->rt_is_input = 1; |
571e7226 | 2378 | |
a6254864 | 2379 | RT_CACHE_STAT_INC(in_slow_tot); |
5510cdf7 | 2380 | if (res->type == RTN_UNREACHABLE) { |
d8d1f30b CG |
2381 | rth->dst.input= ip_error; |
2382 | rth->dst.error= -err; | |
6b9c8f46 | 2383 | rth->rt_flags &= ~RTCF_LOCAL; |
1da177e4 | 2384 | } |
efd85700 | 2385 | |
dcdfdf56 | 2386 | if (do_cache) { |
eba618ab | 2387 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
efd85700 | 2388 | |
eba618ab | 2389 | rth->dst.lwtstate = lwtstate_get(nhc->nhc_lwtstate); |
efd85700 TG |
2390 | if (lwtunnel_input_redirect(rth->dst.lwtstate)) { |
2391 | WARN_ON(rth->dst.input == lwtunnel_input); | |
2392 | rth->dst.lwtstate->orig_input = rth->dst.input; | |
2393 | rth->dst.input = lwtunnel_input; | |
2394 | } | |
2395 | ||
87063a1f | 2396 | if (unlikely(!rt_cache_route(nhc, rth))) |
dcdfdf56 | 2397 | rt_add_uncached_list(rth); |
dcdfdf56 | 2398 | } |
89aef892 | 2399 | skb_dst_set(skb, &rth->dst); |
b23dd4fe | 2400 | err = 0; |
ebc0ffae | 2401 | goto out; |
1da177e4 LT |
2402 | |
2403 | no_route: | |
2404 | RT_CACHE_STAT_INC(in_no_route); | |
5510cdf7 DA |
2405 | res->type = RTN_UNREACHABLE; |
2406 | res->fi = NULL; | |
2407 | res->table = NULL; | |
1da177e4 LT |
2408 | goto local_input; |
2409 | ||
2410 | /* | |
2411 | * Do not cache martian addresses: they should be logged (RFC1812) | |
2412 | */ | |
2413 | martian_destination: | |
2414 | RT_CACHE_STAT_INC(in_martian_dst); | |
2415 | #ifdef CONFIG_IP_ROUTE_VERBOSE | |
e87cc472 JP |
2416 | if (IN_DEV_LOG_MARTIANS(in_dev)) |
2417 | net_warn_ratelimited("martian destination %pI4 from %pI4, dev %s\n", | |
2418 | &daddr, &saddr, dev->name); | |
1da177e4 | 2419 | #endif |
2c2910a4 | 2420 | |
1da177e4 LT |
2421 | e_inval: |
2422 | err = -EINVAL; | |
ebc0ffae | 2423 | goto out; |
1da177e4 LT |
2424 | |
2425 | e_nobufs: | |
2426 | err = -ENOBUFS; | |
ebc0ffae | 2427 | goto out; |
1da177e4 LT |
2428 | |
2429 | martian_source: | |
2430 | ip_handle_martian_source(dev, in_dev, skb, daddr, saddr); | |
ebc0ffae | 2431 | goto out; |
1da177e4 LT |
2432 | } |
2433 | ||
5510cdf7 | 2434 | /* called with rcu_read_lock held */ |
5022e221 ZS |
2435 | static int ip_route_input_rcu(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2436 | u8 tos, struct net_device *dev, struct fib_result *res) | |
5510cdf7 | 2437 | { |
1da177e4 | 2438 | /* Multicast recognition logic is moved from route cache to here. |
6ad08600 SK |
2439 | * The problem was that too many Ethernet cards have broken/missing |
2440 | * hardware multicast filters :-( As result the host on multicasting | |
2441 | * network acquires a lot of useless route cache entries, sort of | |
2442 | * SDR messages from all the world. Now we try to get rid of them. | |
2443 | * Really, provided software IP multicast filter is organized | |
2444 | * reasonably (at least, hashed), it does not result in a slowdown | |
2445 | * comparing with route cache reject entries. | |
2446 | * Note, that multicast routers are not affected, because | |
2447 | * route cache entry is created eventually. | |
1da177e4 | 2448 | */ |
f97c1e0c | 2449 | if (ipv4_is_multicast(daddr)) { |
96d36220 | 2450 | struct in_device *in_dev = __in_dev_get_rcu(dev); |
e58e4159 | 2451 | int our = 0; |
5510cdf7 | 2452 | int err = -EINVAL; |
1da177e4 | 2453 | |
22c74764 PA |
2454 | if (!in_dev) |
2455 | return err; | |
2456 | our = ip_check_mc_rcu(in_dev, daddr, saddr, | |
2457 | ip_hdr(skb)->protocol); | |
e58e4159 DA |
2458 | |
2459 | /* check l3 master if no match yet */ | |
22c74764 | 2460 | if (!our && netif_is_l3_slave(dev)) { |
e58e4159 DA |
2461 | struct in_device *l3_in_dev; |
2462 | ||
2463 | l3_in_dev = __in_dev_get_rcu(skb->dev); | |
2464 | if (l3_in_dev) | |
2465 | our = ip_check_mc_rcu(l3_in_dev, daddr, saddr, | |
2466 | ip_hdr(skb)->protocol); | |
2467 | } | |
2468 | ||
e58e4159 | 2469 | if (our |
1da177e4 | 2470 | #ifdef CONFIG_IP_MROUTE |
e58e4159 DA |
2471 | || |
2472 | (!ipv4_is_local_multicast(daddr) && | |
2473 | IN_DEV_MFORWARD(in_dev)) | |
1da177e4 | 2474 | #endif |
e58e4159 | 2475 | ) { |
5510cdf7 | 2476 | err = ip_route_input_mc(skb, daddr, saddr, |
e58e4159 | 2477 | tos, dev, our); |
1da177e4 | 2478 | } |
5510cdf7 | 2479 | return err; |
1da177e4 | 2480 | } |
5510cdf7 DA |
2481 | |
2482 | return ip_route_input_slow(skb, daddr, saddr, tos, dev, res); | |
1da177e4 LT |
2483 | } |
2484 | ||
5022e221 ZS |
2485 | int ip_route_input_noref(struct sk_buff *skb, __be32 daddr, __be32 saddr, |
2486 | u8 tos, struct net_device *dev) | |
2487 | { | |
2488 | struct fib_result res; | |
2489 | int err; | |
2490 | ||
2491 | tos &= IPTOS_RT_MASK; | |
2492 | rcu_read_lock(); | |
2493 | err = ip_route_input_rcu(skb, daddr, saddr, tos, dev, &res); | |
2494 | rcu_read_unlock(); | |
2495 | ||
2496 | return err; | |
2497 | } | |
2498 | EXPORT_SYMBOL(ip_route_input_noref); | |
2499 | ||
ebc0ffae | 2500 | /* called with rcu_read_lock() */ |
982721f3 | 2501 | static struct rtable *__mkroute_output(const struct fib_result *res, |
1a00fee4 | 2502 | const struct flowi4 *fl4, int orig_oif, |
f61759e6 | 2503 | struct net_device *dev_out, |
5ada5527 | 2504 | unsigned int flags) |
1da177e4 | 2505 | { |
982721f3 | 2506 | struct fib_info *fi = res->fi; |
f2bb4bed | 2507 | struct fib_nh_exception *fnhe; |
5ada5527 | 2508 | struct in_device *in_dev; |
982721f3 | 2509 | u16 type = res->type; |
5ada5527 | 2510 | struct rtable *rth; |
c92b9655 | 2511 | bool do_cache; |
1da177e4 | 2512 | |
d0daebc3 TG |
2513 | in_dev = __in_dev_get_rcu(dev_out); |
2514 | if (!in_dev) | |
5ada5527 | 2515 | return ERR_PTR(-EINVAL); |
1da177e4 | 2516 | |
d0daebc3 | 2517 | if (likely(!IN_DEV_ROUTE_LOCALNET(in_dev))) |
5f02ce24 DA |
2518 | if (ipv4_is_loopback(fl4->saddr) && |
2519 | !(dev_out->flags & IFF_LOOPBACK) && | |
2520 | !netif_is_l3_master(dev_out)) | |
d0daebc3 TG |
2521 | return ERR_PTR(-EINVAL); |
2522 | ||
68a5e3dd | 2523 | if (ipv4_is_lbcast(fl4->daddr)) |
982721f3 | 2524 | type = RTN_BROADCAST; |
68a5e3dd | 2525 | else if (ipv4_is_multicast(fl4->daddr)) |
982721f3 | 2526 | type = RTN_MULTICAST; |
68a5e3dd | 2527 | else if (ipv4_is_zeronet(fl4->daddr)) |
5ada5527 | 2528 | return ERR_PTR(-EINVAL); |
1da177e4 LT |
2529 | |
2530 | if (dev_out->flags & IFF_LOOPBACK) | |
2531 | flags |= RTCF_LOCAL; | |
2532 | ||
63617421 | 2533 | do_cache = true; |
982721f3 | 2534 | if (type == RTN_BROADCAST) { |
1da177e4 | 2535 | flags |= RTCF_BROADCAST | RTCF_LOCAL; |
982721f3 DM |
2536 | fi = NULL; |
2537 | } else if (type == RTN_MULTICAST) { | |
dd28d1a0 | 2538 | flags |= RTCF_MULTICAST | RTCF_LOCAL; |
813b3b5d DM |
2539 | if (!ip_check_mc_rcu(in_dev, fl4->daddr, fl4->saddr, |
2540 | fl4->flowi4_proto)) | |
1da177e4 | 2541 | flags &= ~RTCF_LOCAL; |
63617421 JA |
2542 | else |
2543 | do_cache = false; | |
1da177e4 | 2544 | /* If multicast route do not exist use |
dd28d1a0 ED |
2545 | * default one, but do not gateway in this case. |
2546 | * Yes, it is hack. | |
1da177e4 | 2547 | */ |
982721f3 DM |
2548 | if (fi && res->prefixlen < 4) |
2549 | fi = NULL; | |
d6d5e999 CF |
2550 | } else if ((type == RTN_LOCAL) && (orig_oif != 0) && |
2551 | (orig_oif != dev_out->ifindex)) { | |
2552 | /* For local routes that require a particular output interface | |
2553 | * we do not want to cache the result. Caching the result | |
2554 | * causes incorrect behaviour when there are multiple source | |
2555 | * addresses on the interface, the end result being that if the | |
2556 | * intended recipient is waiting on that interface for the | |
2557 | * packet he won't receive it because it will be delivered on | |
2558 | * the loopback interface and the IP_PKTINFO ipi_ifindex will | |
2559 | * be set to the loopback interface as well. | |
2560 | */ | |
94720e3a | 2561 | do_cache = false; |
1da177e4 LT |
2562 | } |
2563 | ||
f2bb4bed | 2564 | fnhe = NULL; |
63617421 | 2565 | do_cache &= fi != NULL; |
94720e3a | 2566 | if (fi) { |
eba618ab | 2567 | struct fib_nh_common *nhc = FIB_RES_NHC(*res); |
c5038a83 | 2568 | struct rtable __rcu **prth; |
d26b3a7c | 2569 | |
a5995e71 | 2570 | fnhe = find_exception(nhc, fl4->daddr); |
94720e3a JA |
2571 | if (!do_cache) |
2572 | goto add; | |
deed49df | 2573 | if (fnhe) { |
2ffae99d | 2574 | prth = &fnhe->fnhe_rth_output; |
94720e3a JA |
2575 | } else { |
2576 | if (unlikely(fl4->flowi4_flags & | |
2577 | FLOWI_FLAG_KNOWN_NH && | |
bdf00467 | 2578 | !(nhc->nhc_gw_family && |
eba618ab | 2579 | nhc->nhc_scope == RT_SCOPE_LINK))) { |
94720e3a JA |
2580 | do_cache = false; |
2581 | goto add; | |
c92b9655 | 2582 | } |
0f457a36 | 2583 | prth = raw_cpu_ptr(nhc->nhc_pcpu_rth_output); |
c92b9655 | 2584 | } |
c5038a83 | 2585 | rth = rcu_dereference(*prth); |
9df16efa | 2586 | if (rt_cache_valid(rth) && dst_hold_safe(&rth->dst)) |
c5038a83 | 2587 | return rth; |
f2bb4bed | 2588 | } |
c92b9655 JA |
2589 | |
2590 | add: | |
d08c4f35 | 2591 | rth = rt_dst_alloc(dev_out, flags, type, |
62679a8d | 2592 | IN_DEV_ORCONF(in_dev, NOXFRM)); |
8391d07b | 2593 | if (!rth) |
5ada5527 | 2594 | return ERR_PTR(-ENOBUFS); |
8391d07b | 2595 | |
9438c871 | 2596 | rth->rt_iif = orig_oif; |
b7503e0c | 2597 | |
1da177e4 LT |
2598 | RT_CACHE_STAT_INC(out_slow_tot); |
2599 | ||
1da177e4 | 2600 | if (flags & (RTCF_BROADCAST | RTCF_MULTICAST)) { |
e905a9ed | 2601 | if (flags & RTCF_LOCAL && |
1da177e4 | 2602 | !(dev_out->flags & IFF_LOOPBACK)) { |
d8d1f30b | 2603 | rth->dst.output = ip_mc_output; |
1da177e4 LT |
2604 | RT_CACHE_STAT_INC(out_slow_mc); |
2605 | } | |
2606 | #ifdef CONFIG_IP_MROUTE | |
982721f3 | 2607 | if (type == RTN_MULTICAST) { |
1da177e4 | 2608 | if (IN_DEV_MFORWARD(in_dev) && |
813b3b5d | 2609 | !ipv4_is_local_multicast(fl4->daddr)) { |
d8d1f30b CG |
2610 | rth->dst.input = ip_mr_input; |
2611 | rth->dst.output = ip_mc_output; | |
1da177e4 LT |
2612 | } |
2613 | } | |
2614 | #endif | |
2615 | } | |
2616 | ||
a4c2fd7f | 2617 | rt_set_nexthop(rth, fl4->daddr, res, fnhe, fi, type, 0, do_cache); |
9942895b | 2618 | lwtunnel_set_redirect(&rth->dst); |
1da177e4 | 2619 | |
5ada5527 | 2620 | return rth; |
1da177e4 LT |
2621 | } |
2622 | ||
1da177e4 LT |
2623 | /* |
2624 | * Major route resolver routine. | |
2625 | */ | |
2626 | ||
3abd1ade DA |
2627 | struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *fl4, |
2628 | const struct sk_buff *skb) | |
1da177e4 | 2629 | { |
d0ea2b12 ED |
2630 | struct fib_result res = { |
2631 | .type = RTN_UNSPEC, | |
2632 | .fi = NULL, | |
2633 | .table = NULL, | |
2634 | .tclassid = 0, | |
2635 | }; | |
5ada5527 | 2636 | struct rtable *rth; |
1da177e4 | 2637 | |
1fb9489b | 2638 | fl4->flowi4_iif = LOOPBACK_IFINDEX; |
544b4dd5 | 2639 | ip_rt_fix_tos(fl4); |
44713b67 | 2640 | |
010c2708 | 2641 | rcu_read_lock(); |
3abd1ade DA |
2642 | rth = ip_route_output_key_hash_rcu(net, fl4, &res, skb); |
2643 | rcu_read_unlock(); | |
2644 | ||
2645 | return rth; | |
2646 | } | |
2647 | EXPORT_SYMBOL_GPL(ip_route_output_key_hash); | |
2648 | ||
2649 | struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *fl4, | |
2650 | struct fib_result *res, | |
2651 | const struct sk_buff *skb) | |
2652 | { | |
2653 | struct net_device *dev_out = NULL; | |
2654 | int orig_oif = fl4->flowi4_oif; | |
2655 | unsigned int flags = 0; | |
2656 | struct rtable *rth; | |
595e0651 | 2657 | int err; |
3abd1ade | 2658 | |
813b3b5d | 2659 | if (fl4->saddr) { |
813b3b5d DM |
2660 | if (ipv4_is_multicast(fl4->saddr) || |
2661 | ipv4_is_lbcast(fl4->saddr) || | |
595e0651 SB |
2662 | ipv4_is_zeronet(fl4->saddr)) { |
2663 | rth = ERR_PTR(-EINVAL); | |
1da177e4 | 2664 | goto out; |
595e0651 SB |
2665 | } |
2666 | ||
2667 | rth = ERR_PTR(-ENETUNREACH); | |
1da177e4 | 2668 | |
1da177e4 | 2669 | /* I removed check for oif == dev_out->oif here. |
6ad08600 SK |
2670 | * It was wrong for two reasons: |
2671 | * 1. ip_dev_find(net, saddr) can return wrong iface, if saddr | |
2672 | * is assigned to multiple interfaces. | |
2673 | * 2. Moreover, we are allowed to send packets with saddr | |
2674 | * of another iface. --ANK | |
1da177e4 LT |
2675 | */ |
2676 | ||
813b3b5d DM |
2677 | if (fl4->flowi4_oif == 0 && |
2678 | (ipv4_is_multicast(fl4->daddr) || | |
2679 | ipv4_is_lbcast(fl4->daddr))) { | |
a210d01a | 2680 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2681 | dev_out = __ip_dev_find(net, fl4->saddr, false); |
51456b29 | 2682 | if (!dev_out) |
a210d01a JA |
2683 | goto out; |
2684 | ||
1da177e4 | 2685 | /* Special hack: user can direct multicasts |
6ad08600 SK |
2686 | * and limited broadcast via necessary interface |
2687 | * without fiddling with IP_MULTICAST_IF or IP_PKTINFO. | |
2688 | * This hack is not just for fun, it allows | |
2689 | * vic,vat and friends to work. | |
2690 | * They bind socket to loopback, set ttl to zero | |
2691 | * and expect that it will work. | |
2692 | * From the viewpoint of routing cache they are broken, | |
2693 | * because we are not allowed to build multicast path | |
2694 | * with loopback source addr (look, routing cache | |
2695 | * cannot know, that ttl is zero, so that packet | |
2696 | * will not leave this host and route is valid). | |
2697 | * Luckily, this hack is good workaround. | |
1da177e4 LT |
2698 | */ |
2699 | ||
813b3b5d | 2700 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2701 | goto make_route; |
2702 | } | |
a210d01a | 2703 | |
813b3b5d | 2704 | if (!(fl4->flowi4_flags & FLOWI_FLAG_ANYSRC)) { |
a210d01a | 2705 | /* It is equivalent to inet_addr_type(saddr) == RTN_LOCAL */ |
813b3b5d | 2706 | if (!__ip_dev_find(net, fl4->saddr, false)) |
a210d01a | 2707 | goto out; |
a210d01a | 2708 | } |
1da177e4 LT |
2709 | } |
2710 | ||
2711 | ||
813b3b5d DM |
2712 | if (fl4->flowi4_oif) { |
2713 | dev_out = dev_get_by_index_rcu(net, fl4->flowi4_oif); | |
b23dd4fe | 2714 | rth = ERR_PTR(-ENODEV); |
51456b29 | 2715 | if (!dev_out) |
1da177e4 | 2716 | goto out; |
e5ed6399 HX |
2717 | |
2718 | /* RACE: Check return value of inet_select_addr instead. */ | |
fc75fc83 | 2719 | if (!(dev_out->flags & IFF_UP) || !__in_dev_get_rcu(dev_out)) { |
b23dd4fe | 2720 | rth = ERR_PTR(-ENETUNREACH); |
fc75fc83 ED |
2721 | goto out; |
2722 | } | |
813b3b5d | 2723 | if (ipv4_is_local_multicast(fl4->daddr) || |
6a211654 AL |
2724 | ipv4_is_lbcast(fl4->daddr) || |
2725 | fl4->flowi4_proto == IPPROTO_IGMP) { | |
813b3b5d DM |
2726 | if (!fl4->saddr) |
2727 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2728 | RT_SCOPE_LINK); | |
1da177e4 LT |
2729 | goto make_route; |
2730 | } | |
0a7e2260 | 2731 | if (!fl4->saddr) { |
813b3b5d DM |
2732 | if (ipv4_is_multicast(fl4->daddr)) |
2733 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2734 | fl4->flowi4_scope); | |
2735 | else if (!fl4->daddr) | |
2736 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2737 | RT_SCOPE_HOST); | |
1da177e4 LT |
2738 | } |
2739 | } | |
2740 | ||
813b3b5d DM |
2741 | if (!fl4->daddr) { |
2742 | fl4->daddr = fl4->saddr; | |
2743 | if (!fl4->daddr) | |
2744 | fl4->daddr = fl4->saddr = htonl(INADDR_LOOPBACK); | |
b40afd0e | 2745 | dev_out = net->loopback_dev; |
1fb9489b | 2746 | fl4->flowi4_oif = LOOPBACK_IFINDEX; |
3abd1ade | 2747 | res->type = RTN_LOCAL; |
1da177e4 LT |
2748 | flags |= RTCF_LOCAL; |
2749 | goto make_route; | |
2750 | } | |
2751 | ||
3abd1ade | 2752 | err = fib_lookup(net, fl4, res, 0); |
0315e382 | 2753 | if (err) { |
3abd1ade DA |
2754 | res->fi = NULL; |
2755 | res->table = NULL; | |
6104e112 | 2756 | if (fl4->flowi4_oif && |
40867d74 | 2757 | (ipv4_is_multicast(fl4->daddr) || !fl4->flowi4_l3mdev)) { |
1da177e4 | 2758 | /* Apparently, routing tables are wrong. Assume, |
6ad08600 SK |
2759 | * that the destination is on link. |
2760 | * | |
2761 | * WHY? DW. | |
2762 | * Because we are allowed to send to iface | |
2763 | * even if it has NO routes and NO assigned | |
2764 | * addresses. When oif is specified, routing | |
2765 | * tables are looked up with only one purpose: | |
2766 | * to catch if destination is gatewayed, rather than | |
2767 | * direct. Moreover, if MSG_DONTROUTE is set, | |
2768 | * we send packet, ignoring both routing tables | |
2769 | * and ifaddr state. --ANK | |
2770 | * | |
2771 | * | |
2772 | * We could make it even if oif is unknown, | |
2773 | * likely IPv6, but we do not. | |
1da177e4 LT |
2774 | */ |
2775 | ||
813b3b5d DM |
2776 | if (fl4->saddr == 0) |
2777 | fl4->saddr = inet_select_addr(dev_out, 0, | |
2778 | RT_SCOPE_LINK); | |
3abd1ade | 2779 | res->type = RTN_UNICAST; |
1da177e4 LT |
2780 | goto make_route; |
2781 | } | |
0315e382 | 2782 | rth = ERR_PTR(err); |
1da177e4 LT |
2783 | goto out; |
2784 | } | |
1da177e4 | 2785 | |
3abd1ade | 2786 | if (res->type == RTN_LOCAL) { |
813b3b5d | 2787 | if (!fl4->saddr) { |
3abd1ade DA |
2788 | if (res->fi->fib_prefsrc) |
2789 | fl4->saddr = res->fi->fib_prefsrc; | |
9fc3bbb4 | 2790 | else |
813b3b5d | 2791 | fl4->saddr = fl4->daddr; |
9fc3bbb4 | 2792 | } |
5f02ce24 DA |
2793 | |
2794 | /* L3 master device is the loopback for that domain */ | |
3abd1ade | 2795 | dev_out = l3mdev_master_dev_rcu(FIB_RES_DEV(*res)) ? : |
b7c8487c | 2796 | net->loopback_dev; |
839da4d9 DA |
2797 | |
2798 | /* make sure orig_oif points to fib result device even | |
2799 | * though packet rx/tx happens over loopback or l3mdev | |
2800 | */ | |
2801 | orig_oif = FIB_RES_OIF(*res); | |
2802 | ||
813b3b5d | 2803 | fl4->flowi4_oif = dev_out->ifindex; |
1da177e4 LT |
2804 | flags |= RTCF_LOCAL; |
2805 | goto make_route; | |
2806 | } | |
2807 | ||
3abd1ade | 2808 | fib_select_path(net, res, fl4, skb); |
1da177e4 | 2809 | |
3abd1ade | 2810 | dev_out = FIB_RES_DEV(*res); |
1da177e4 LT |
2811 | |
2812 | make_route: | |
3abd1ade | 2813 | rth = __mkroute_output(res, fl4, orig_oif, dev_out, flags); |
1da177e4 | 2814 | |
010c2708 | 2815 | out: |
b23dd4fe | 2816 | return rth; |
1da177e4 | 2817 | } |
d8c97a94 | 2818 | |
14e50e57 | 2819 | static struct dst_ops ipv4_dst_blackhole_ops = { |
c4c877b2 DB |
2820 | .family = AF_INET, |
2821 | .default_advmss = ipv4_default_advmss, | |
2822 | .neigh_lookup = ipv4_neigh_lookup, | |
2823 | .check = dst_blackhole_check, | |
2824 | .cow_metrics = dst_blackhole_cow_metrics, | |
2825 | .update_pmtu = dst_blackhole_update_pmtu, | |
2826 | .redirect = dst_blackhole_redirect, | |
2827 | .mtu = dst_blackhole_mtu, | |
14e50e57 DM |
2828 | }; |
2829 | ||
2774c131 | 2830 | struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig) |
14e50e57 | 2831 | { |
2774c131 | 2832 | struct rtable *ort = (struct rtable *) dst_orig; |
f5b0a874 | 2833 | struct rtable *rt; |
14e50e57 | 2834 | |
762c8dc7 | 2835 | rt = dst_alloc(&ipv4_dst_blackhole_ops, NULL, DST_OBSOLETE_DEAD, 0); |
14e50e57 | 2836 | if (rt) { |
d8d1f30b | 2837 | struct dst_entry *new = &rt->dst; |
14e50e57 | 2838 | |
14e50e57 | 2839 | new->__use = 1; |
352e512c | 2840 | new->input = dst_discard; |
ede2059d | 2841 | new->output = dst_discard_out; |
14e50e57 | 2842 | |
1dbe3252 | 2843 | new->dev = net->loopback_dev; |
d62607c3 | 2844 | netdev_hold(new->dev, &new->dev_tracker, GFP_ATOMIC); |
14e50e57 | 2845 | |
9917e1e8 | 2846 | rt->rt_is_input = ort->rt_is_input; |
5e2b61f7 | 2847 | rt->rt_iif = ort->rt_iif; |
5943634f | 2848 | rt->rt_pmtu = ort->rt_pmtu; |
d52e5a7e | 2849 | rt->rt_mtu_locked = ort->rt_mtu_locked; |
14e50e57 | 2850 | |
ca4c3fc2 | 2851 | rt->rt_genid = rt_genid_ipv4(net); |
14e50e57 DM |
2852 | rt->rt_flags = ort->rt_flags; |
2853 | rt->rt_type = ort->rt_type; | |
77d5bc7e | 2854 | rt->rt_uses_gateway = ort->rt_uses_gateway; |
1550c171 DA |
2855 | rt->rt_gw_family = ort->rt_gw_family; |
2856 | if (rt->rt_gw_family == AF_INET) | |
2857 | rt->rt_gw4 = ort->rt_gw4; | |
0f5f7d7b DA |
2858 | else if (rt->rt_gw_family == AF_INET6) |
2859 | rt->rt_gw6 = ort->rt_gw6; | |
14e50e57 DM |
2860 | } |
2861 | ||
2774c131 DM |
2862 | dst_release(dst_orig); |
2863 | ||
2864 | return rt ? &rt->dst : ERR_PTR(-ENOMEM); | |
14e50e57 DM |
2865 | } |
2866 | ||
9d6ec938 | 2867 | struct rtable *ip_route_output_flow(struct net *net, struct flowi4 *flp4, |
6f9c9615 | 2868 | const struct sock *sk) |
1da177e4 | 2869 | { |
9d6ec938 | 2870 | struct rtable *rt = __ip_route_output_key(net, flp4); |
1da177e4 | 2871 | |
b23dd4fe DM |
2872 | if (IS_ERR(rt)) |
2873 | return rt; | |
1da177e4 | 2874 | |
874fb9e2 DA |
2875 | if (flp4->flowi4_proto) { |
2876 | flp4->flowi4_oif = rt->dst.dev->ifindex; | |
f92ee619 SK |
2877 | rt = (struct rtable *)xfrm_lookup_route(net, &rt->dst, |
2878 | flowi4_to_flowi(flp4), | |
2879 | sk, 0); | |
874fb9e2 | 2880 | } |
1da177e4 | 2881 | |
b23dd4fe | 2882 | return rt; |
1da177e4 | 2883 | } |
d8c97a94 ACM |
2884 | EXPORT_SYMBOL_GPL(ip_route_output_flow); |
2885 | ||
3765d35e | 2886 | /* called with rcu_read_lock held */ |
404eb77e RP |
2887 | static int rt_fill_info(struct net *net, __be32 dst, __be32 src, |
2888 | struct rtable *rt, u32 table_id, struct flowi4 *fl4, | |
e93fb3e9 JF |
2889 | struct sk_buff *skb, u32 portid, u32 seq, |
2890 | unsigned int flags) | |
1da177e4 | 2891 | { |
1da177e4 | 2892 | struct rtmsg *r; |
be403ea1 | 2893 | struct nlmsghdr *nlh; |
2bc8ca40 | 2894 | unsigned long expires = 0; |
f185071d | 2895 | u32 error; |
521f5490 | 2896 | u32 metrics[RTAX_MAX]; |
be403ea1 | 2897 | |
e93fb3e9 | 2898 | nlh = nlmsg_put(skb, portid, seq, RTM_NEWROUTE, sizeof(*r), flags); |
51456b29 | 2899 | if (!nlh) |
26932566 | 2900 | return -EMSGSIZE; |
be403ea1 TG |
2901 | |
2902 | r = nlmsg_data(nlh); | |
1da177e4 LT |
2903 | r->rtm_family = AF_INET; |
2904 | r->rtm_dst_len = 32; | |
2905 | r->rtm_src_len = 0; | |
d948974c | 2906 | r->rtm_tos = fl4 ? fl4->flowi4_tos : 0; |
8a430ed5 | 2907 | r->rtm_table = table_id < 256 ? table_id : RT_TABLE_COMPAT; |
c36ba660 | 2908 | if (nla_put_u32(skb, RTA_TABLE, table_id)) |
f3756b79 | 2909 | goto nla_put_failure; |
1da177e4 LT |
2910 | r->rtm_type = rt->rt_type; |
2911 | r->rtm_scope = RT_SCOPE_UNIVERSE; | |
2912 | r->rtm_protocol = RTPROT_UNSPEC; | |
2913 | r->rtm_flags = (rt->rt_flags & ~0xFFFF) | RTM_F_CLONED; | |
2914 | if (rt->rt_flags & RTCF_NOTIFY) | |
2915 | r->rtm_flags |= RTM_F_NOTIFY; | |
df4d9254 HFS |
2916 | if (IPCB(skb)->flags & IPSKB_DOREDIRECT) |
2917 | r->rtm_flags |= RTCF_DOREDIRECT; | |
be403ea1 | 2918 | |
930345ea | 2919 | if (nla_put_in_addr(skb, RTA_DST, dst)) |
f3756b79 | 2920 | goto nla_put_failure; |
1a00fee4 | 2921 | if (src) { |
1da177e4 | 2922 | r->rtm_src_len = 32; |
930345ea | 2923 | if (nla_put_in_addr(skb, RTA_SRC, src)) |
f3756b79 | 2924 | goto nla_put_failure; |
1da177e4 | 2925 | } |
f3756b79 DM |
2926 | if (rt->dst.dev && |
2927 | nla_put_u32(skb, RTA_OIF, rt->dst.dev->ifindex)) | |
2928 | goto nla_put_failure; | |
ae8cb932 OH |
2929 | if (rt->dst.lwtstate && |
2930 | lwtunnel_fill_encap(skb, rt->dst.lwtstate, RTA_ENCAP, RTA_ENCAP_TYPE) < 0) | |
2931 | goto nla_put_failure; | |
c7066f70 | 2932 | #ifdef CONFIG_IP_ROUTE_CLASSID |
f3756b79 DM |
2933 | if (rt->dst.tclassid && |
2934 | nla_put_u32(skb, RTA_FLOW, rt->dst.tclassid)) | |
2935 | goto nla_put_failure; | |
1da177e4 | 2936 | #endif |
d948974c | 2937 | if (fl4 && !rt_is_input_route(rt) && |
d6c0a4f6 | 2938 | fl4->saddr != src) { |
930345ea | 2939 | if (nla_put_in_addr(skb, RTA_PREFSRC, fl4->saddr)) |
f3756b79 DM |
2940 | goto nla_put_failure; |
2941 | } | |
77d5bc7e DA |
2942 | if (rt->rt_uses_gateway) { |
2943 | if (rt->rt_gw_family == AF_INET && | |
2944 | nla_put_in_addr(skb, RTA_GATEWAY, rt->rt_gw4)) { | |
0f5f7d7b | 2945 | goto nla_put_failure; |
77d5bc7e DA |
2946 | } else if (rt->rt_gw_family == AF_INET6) { |
2947 | int alen = sizeof(struct in6_addr); | |
2948 | struct nlattr *nla; | |
2949 | struct rtvia *via; | |
2950 | ||
2951 | nla = nla_reserve(skb, RTA_VIA, alen + 2); | |
2952 | if (!nla) | |
2953 | goto nla_put_failure; | |
2954 | ||
2955 | via = nla_data(nla); | |
2956 | via->rtvia_family = AF_INET6; | |
2957 | memcpy(via->rtvia_addr, &rt->rt_gw6, alen); | |
2958 | } | |
0f5f7d7b | 2959 | } |
be403ea1 | 2960 | |
ee9a8f7a SK |
2961 | expires = rt->dst.expires; |
2962 | if (expires) { | |
2963 | unsigned long now = jiffies; | |
2964 | ||
2965 | if (time_before(now, expires)) | |
2966 | expires -= now; | |
2967 | else | |
2968 | expires = 0; | |
2969 | } | |
2970 | ||
521f5490 | 2971 | memcpy(metrics, dst_metrics_ptr(&rt->dst), sizeof(metrics)); |
ee9a8f7a | 2972 | if (rt->rt_pmtu && expires) |
521f5490 | 2973 | metrics[RTAX_MTU - 1] = rt->rt_pmtu; |
d52e5a7e SD |
2974 | if (rt->rt_mtu_locked && expires) |
2975 | metrics[RTAX_LOCK - 1] |= BIT(RTAX_MTU); | |
521f5490 | 2976 | if (rtnetlink_put_metrics(skb, metrics) < 0) |
be403ea1 TG |
2977 | goto nla_put_failure; |
2978 | ||
d948974c SB |
2979 | if (fl4) { |
2980 | if (fl4->flowi4_mark && | |
2981 | nla_put_u32(skb, RTA_MARK, fl4->flowi4_mark)) | |
2982 | goto nla_put_failure; | |
622ec2c9 | 2983 | |
d948974c SB |
2984 | if (!uid_eq(fl4->flowi4_uid, INVALID_UID) && |
2985 | nla_put_u32(skb, RTA_UID, | |
2986 | from_kuid_munged(current_user_ns(), | |
2987 | fl4->flowi4_uid))) | |
2988 | goto nla_put_failure; | |
be403ea1 | 2989 | |
d948974c | 2990 | if (rt_is_input_route(rt)) { |
8caaf7b6 | 2991 | #ifdef CONFIG_IP_MROUTE |
d948974c SB |
2992 | if (ipv4_is_multicast(dst) && |
2993 | !ipv4_is_local_multicast(dst) && | |
0598f8f3 | 2994 | IPV4_DEVCONF_ALL_RO(net, MC_FORWARDING)) { |
d948974c SB |
2995 | int err = ipmr_get_route(net, skb, |
2996 | fl4->saddr, fl4->daddr, | |
2997 | r, portid); | |
2998 | ||
2999 | if (err <= 0) { | |
3000 | if (err == 0) | |
3001 | return 0; | |
3002 | goto nla_put_failure; | |
3003 | } | |
3004 | } else | |
8caaf7b6 | 3005 | #endif |
d948974c SB |
3006 | if (nla_put_u32(skb, RTA_IIF, fl4->flowi4_iif)) |
3007 | goto nla_put_failure; | |
3008 | } | |
1da177e4 LT |
3009 | } |
3010 | ||
d948974c SB |
3011 | error = rt->dst.error; |
3012 | ||
f185071d | 3013 | if (rtnl_put_cacheinfo(skb, &rt->dst, 0, expires, error) < 0) |
e3703b3d | 3014 | goto nla_put_failure; |
be403ea1 | 3015 | |
053c095a JB |
3016 | nlmsg_end(skb, nlh); |
3017 | return 0; | |
1da177e4 | 3018 | |
be403ea1 | 3019 | nla_put_failure: |
26932566 PM |
3020 | nlmsg_cancel(skb, nlh); |
3021 | return -EMSGSIZE; | |
1da177e4 LT |
3022 | } |
3023 | ||
ee28906f SB |
3024 | static int fnhe_dump_bucket(struct net *net, struct sk_buff *skb, |
3025 | struct netlink_callback *cb, u32 table_id, | |
3026 | struct fnhe_hash_bucket *bucket, int genid, | |
e93fb3e9 | 3027 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
3028 | { |
3029 | int i; | |
3030 | ||
3031 | for (i = 0; i < FNHE_HASH_SIZE; i++) { | |
3032 | struct fib_nh_exception *fnhe; | |
3033 | ||
3034 | for (fnhe = rcu_dereference(bucket[i].chain); fnhe; | |
3035 | fnhe = rcu_dereference(fnhe->fnhe_next)) { | |
3036 | struct rtable *rt; | |
3037 | int err; | |
3038 | ||
3039 | if (*fa_index < fa_start) | |
3040 | goto next; | |
3041 | ||
3042 | if (fnhe->fnhe_genid != genid) | |
3043 | goto next; | |
3044 | ||
3045 | if (fnhe->fnhe_expires && | |
3046 | time_after(jiffies, fnhe->fnhe_expires)) | |
3047 | goto next; | |
3048 | ||
3049 | rt = rcu_dereference(fnhe->fnhe_rth_input); | |
3050 | if (!rt) | |
3051 | rt = rcu_dereference(fnhe->fnhe_rth_output); | |
3052 | if (!rt) | |
3053 | goto next; | |
3054 | ||
3055 | err = rt_fill_info(net, fnhe->fnhe_daddr, 0, rt, | |
3056 | table_id, NULL, skb, | |
3057 | NETLINK_CB(cb->skb).portid, | |
e93fb3e9 | 3058 | cb->nlh->nlmsg_seq, flags); |
ee28906f SB |
3059 | if (err) |
3060 | return err; | |
3061 | next: | |
3062 | (*fa_index)++; | |
3063 | } | |
3064 | } | |
3065 | ||
3066 | return 0; | |
3067 | } | |
3068 | ||
3069 | int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb, | |
3070 | u32 table_id, struct fib_info *fi, | |
e93fb3e9 | 3071 | int *fa_index, int fa_start, unsigned int flags) |
ee28906f SB |
3072 | { |
3073 | struct net *net = sock_net(cb->skb->sk); | |
3074 | int nhsel, genid = fnhe_genid(net); | |
3075 | ||
3076 | for (nhsel = 0; nhsel < fib_info_num_path(fi); nhsel++) { | |
3077 | struct fib_nh_common *nhc = fib_info_nhc(fi, nhsel); | |
3078 | struct fnhe_hash_bucket *bucket; | |
3079 | int err; | |
3080 | ||
3081 | if (nhc->nhc_flags & RTNH_F_DEAD) | |
3082 | continue; | |
3083 | ||
93ed54b1 | 3084 | rcu_read_lock(); |
ee28906f | 3085 | bucket = rcu_dereference(nhc->nhc_exceptions); |
93ed54b1 ED |
3086 | err = 0; |
3087 | if (bucket) | |
3088 | err = fnhe_dump_bucket(net, skb, cb, table_id, bucket, | |
e93fb3e9 JF |
3089 | genid, fa_index, fa_start, |
3090 | flags); | |
93ed54b1 | 3091 | rcu_read_unlock(); |
ee28906f SB |
3092 | if (err) |
3093 | return err; | |
3094 | } | |
3095 | ||
3096 | return 0; | |
3097 | } | |
3098 | ||
404eb77e RP |
3099 | static struct sk_buff *inet_rtm_getroute_build_skb(__be32 src, __be32 dst, |
3100 | u8 ip_proto, __be16 sport, | |
3101 | __be16 dport) | |
3102 | { | |
3103 | struct sk_buff *skb; | |
3104 | struct iphdr *iph; | |
3105 | ||
3106 | skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); | |
3107 | if (!skb) | |
3108 | return NULL; | |
3109 | ||
3110 | /* Reserve room for dummy headers, this skb can pass | |
3111 | * through good chunk of routing engine. | |
3112 | */ | |
3113 | skb_reset_mac_header(skb); | |
3114 | skb_reset_network_header(skb); | |
3115 | skb->protocol = htons(ETH_P_IP); | |
3116 | iph = skb_put(skb, sizeof(struct iphdr)); | |
3117 | iph->protocol = ip_proto; | |
3118 | iph->saddr = src; | |
3119 | iph->daddr = dst; | |
3120 | iph->version = 0x4; | |
3121 | iph->frag_off = 0; | |
3122 | iph->ihl = 0x5; | |
3123 | skb_set_transport_header(skb, skb->len); | |
3124 | ||
3125 | switch (iph->protocol) { | |
3126 | case IPPROTO_UDP: { | |
3127 | struct udphdr *udph; | |
3128 | ||
3129 | udph = skb_put_zero(skb, sizeof(struct udphdr)); | |
3130 | udph->source = sport; | |
3131 | udph->dest = dport; | |
92548b0e | 3132 | udph->len = htons(sizeof(struct udphdr)); |
404eb77e RP |
3133 | udph->check = 0; |
3134 | break; | |
3135 | } | |
3136 | case IPPROTO_TCP: { | |
3137 | struct tcphdr *tcph; | |
3138 | ||
3139 | tcph = skb_put_zero(skb, sizeof(struct tcphdr)); | |
3140 | tcph->source = sport; | |
3141 | tcph->dest = dport; | |
3142 | tcph->doff = sizeof(struct tcphdr) / 4; | |
3143 | tcph->rst = 1; | |
3144 | tcph->check = ~tcp_v4_check(sizeof(struct tcphdr), | |
3145 | src, dst, 0); | |
3146 | break; | |
3147 | } | |
3148 | case IPPROTO_ICMP: { | |
3149 | struct icmphdr *icmph; | |
3150 | ||
3151 | icmph = skb_put_zero(skb, sizeof(struct icmphdr)); | |
3152 | icmph->type = ICMP_ECHO; | |
3153 | icmph->code = 0; | |
3154 | } | |
3155 | } | |
3156 | ||
3157 | return skb; | |
3158 | } | |
3159 | ||
a00302b6 JK |
3160 | static int inet_rtm_valid_getroute_req(struct sk_buff *skb, |
3161 | const struct nlmsghdr *nlh, | |
3162 | struct nlattr **tb, | |
3163 | struct netlink_ext_ack *extack) | |
3164 | { | |
3165 | struct rtmsg *rtm; | |
3166 | int i, err; | |
3167 | ||
3168 | if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { | |
3169 | NL_SET_ERR_MSG(extack, | |
3170 | "ipv4: Invalid header for route get request"); | |
3171 | return -EINVAL; | |
3172 | } | |
3173 | ||
3174 | if (!netlink_strict_get_check(skb)) | |
8cb08174 JB |
3175 | return nlmsg_parse_deprecated(nlh, sizeof(*rtm), tb, RTA_MAX, |
3176 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3177 | |
3178 | rtm = nlmsg_data(nlh); | |
3179 | if ((rtm->rtm_src_len && rtm->rtm_src_len != 32) || | |
3180 | (rtm->rtm_dst_len && rtm->rtm_dst_len != 32) || | |
3181 | rtm->rtm_table || rtm->rtm_protocol || | |
3182 | rtm->rtm_scope || rtm->rtm_type) { | |
3183 | NL_SET_ERR_MSG(extack, "ipv4: Invalid values in header for route get request"); | |
3184 | return -EINVAL; | |
3185 | } | |
3186 | ||
3187 | if (rtm->rtm_flags & ~(RTM_F_NOTIFY | | |
3188 | RTM_F_LOOKUP_TABLE | | |
3189 | RTM_F_FIB_MATCH)) { | |
3190 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported rtm_flags for route get request"); | |
3191 | return -EINVAL; | |
3192 | } | |
3193 | ||
8cb08174 JB |
3194 | err = nlmsg_parse_deprecated_strict(nlh, sizeof(*rtm), tb, RTA_MAX, |
3195 | rtm_ipv4_policy, extack); | |
a00302b6 JK |
3196 | if (err) |
3197 | return err; | |
3198 | ||
3199 | if ((tb[RTA_SRC] && !rtm->rtm_src_len) || | |
3200 | (tb[RTA_DST] && !rtm->rtm_dst_len)) { | |
3201 | NL_SET_ERR_MSG(extack, "ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4"); | |
3202 | return -EINVAL; | |
3203 | } | |
3204 | ||
3205 | for (i = 0; i <= RTA_MAX; i++) { | |
3206 | if (!tb[i]) | |
3207 | continue; | |
3208 | ||
3209 | switch (i) { | |
3210 | case RTA_IIF: | |
3211 | case RTA_OIF: | |
3212 | case RTA_SRC: | |
3213 | case RTA_DST: | |
3214 | case RTA_IP_PROTO: | |
3215 | case RTA_SPORT: | |
3216 | case RTA_DPORT: | |
3217 | case RTA_MARK: | |
3218 | case RTA_UID: | |
3219 | break; | |
3220 | default: | |
3221 | NL_SET_ERR_MSG(extack, "ipv4: Unsupported attribute in route get request"); | |
3222 | return -EINVAL; | |
3223 | } | |
3224 | } | |
3225 | ||
3226 | return 0; | |
3227 | } | |
3228 | ||
c21ef3e3 DA |
3229 | static int inet_rtm_getroute(struct sk_buff *in_skb, struct nlmsghdr *nlh, |
3230 | struct netlink_ext_ack *extack) | |
1da177e4 | 3231 | { |
3b1e0a65 | 3232 | struct net *net = sock_net(in_skb->sk); |
d889ce3b | 3233 | struct nlattr *tb[RTA_MAX+1]; |
404eb77e RP |
3234 | u32 table_id = RT_TABLE_MAIN; |
3235 | __be16 sport = 0, dport = 0; | |
3765d35e | 3236 | struct fib_result res = {}; |
404eb77e | 3237 | u8 ip_proto = IPPROTO_UDP; |
1da177e4 | 3238 | struct rtable *rt = NULL; |
404eb77e RP |
3239 | struct sk_buff *skb; |
3240 | struct rtmsg *rtm; | |
e8e3fbe9 | 3241 | struct flowi4 fl4 = {}; |
9e12bb22 AV |
3242 | __be32 dst = 0; |
3243 | __be32 src = 0; | |
404eb77e | 3244 | kuid_t uid; |
9e12bb22 | 3245 | u32 iif; |
d889ce3b | 3246 | int err; |
963bfeee | 3247 | int mark; |
1da177e4 | 3248 | |
a00302b6 | 3249 | err = inet_rtm_valid_getroute_req(in_skb, nlh, tb, extack); |
d889ce3b | 3250 | if (err < 0) |
404eb77e | 3251 | return err; |
d889ce3b TG |
3252 | |
3253 | rtm = nlmsg_data(nlh); | |
67b61f6c JB |
3254 | src = tb[RTA_SRC] ? nla_get_in_addr(tb[RTA_SRC]) : 0; |
3255 | dst = tb[RTA_DST] ? nla_get_in_addr(tb[RTA_DST]) : 0; | |
d889ce3b | 3256 | iif = tb[RTA_IIF] ? nla_get_u32(tb[RTA_IIF]) : 0; |
963bfeee | 3257 | mark = tb[RTA_MARK] ? nla_get_u32(tb[RTA_MARK]) : 0; |
622ec2c9 LC |
3258 | if (tb[RTA_UID]) |
3259 | uid = make_kuid(current_user_ns(), nla_get_u32(tb[RTA_UID])); | |
3260 | else | |
3261 | uid = (iif ? INVALID_UID : current_uid()); | |
1da177e4 | 3262 | |
404eb77e RP |
3263 | if (tb[RTA_IP_PROTO]) { |
3264 | err = rtm_getroute_parse_ip_proto(tb[RTA_IP_PROTO], | |
5e1a99ea | 3265 | &ip_proto, AF_INET, extack); |
404eb77e RP |
3266 | if (err) |
3267 | return err; | |
3268 | } | |
bbadb9a2 | 3269 | |
404eb77e RP |
3270 | if (tb[RTA_SPORT]) |
3271 | sport = nla_get_be16(tb[RTA_SPORT]); | |
bbadb9a2 | 3272 | |
404eb77e RP |
3273 | if (tb[RTA_DPORT]) |
3274 | dport = nla_get_be16(tb[RTA_DPORT]); | |
3275 | ||
3276 | skb = inet_rtm_getroute_build_skb(src, dst, ip_proto, sport, dport); | |
3277 | if (!skb) | |
3278 | return -ENOBUFS; | |
bbadb9a2 | 3279 | |
d6c0a4f6 DM |
3280 | fl4.daddr = dst; |
3281 | fl4.saddr = src; | |
1ebf1790 | 3282 | fl4.flowi4_tos = rtm->rtm_tos & IPTOS_RT_MASK; |
d6c0a4f6 DM |
3283 | fl4.flowi4_oif = tb[RTA_OIF] ? nla_get_u32(tb[RTA_OIF]) : 0; |
3284 | fl4.flowi4_mark = mark; | |
622ec2c9 | 3285 | fl4.flowi4_uid = uid; |
404eb77e RP |
3286 | if (sport) |
3287 | fl4.fl4_sport = sport; | |
3288 | if (dport) | |
3289 | fl4.fl4_dport = dport; | |
3290 | fl4.flowi4_proto = ip_proto; | |
d6c0a4f6 | 3291 | |
3765d35e DA |
3292 | rcu_read_lock(); |
3293 | ||
1da177e4 | 3294 | if (iif) { |
d889ce3b TG |
3295 | struct net_device *dev; |
3296 | ||
3765d35e | 3297 | dev = dev_get_by_index_rcu(net, iif); |
51456b29 | 3298 | if (!dev) { |
d889ce3b | 3299 | err = -ENODEV; |
404eb77e | 3300 | goto errout_rcu; |
d889ce3b TG |
3301 | } |
3302 | ||
404eb77e | 3303 | fl4.flowi4_iif = iif; /* for rt_fill_info */ |
1da177e4 | 3304 | skb->dev = dev; |
963bfeee | 3305 | skb->mark = mark; |
1ebf1790 GN |
3306 | err = ip_route_input_rcu(skb, dst, src, |
3307 | rtm->rtm_tos & IPTOS_RT_MASK, dev, | |
3308 | &res); | |
d889ce3b | 3309 | |
511c3f92 | 3310 | rt = skb_rtable(skb); |
d8d1f30b CG |
3311 | if (err == 0 && rt->dst.error) |
3312 | err = -rt->dst.error; | |
1da177e4 | 3313 | } else { |
6503a304 | 3314 | fl4.flowi4_iif = LOOPBACK_IFINDEX; |
21f94775 | 3315 | skb->dev = net->loopback_dev; |
3765d35e | 3316 | rt = ip_route_output_key_hash_rcu(net, &fl4, &res, skb); |
b23dd4fe DM |
3317 | err = 0; |
3318 | if (IS_ERR(rt)) | |
3319 | err = PTR_ERR(rt); | |
2c87d63a FW |
3320 | else |
3321 | skb_dst_set(skb, &rt->dst); | |
1da177e4 | 3322 | } |
d889ce3b | 3323 | |
1da177e4 | 3324 | if (err) |
404eb77e | 3325 | goto errout_rcu; |
1da177e4 | 3326 | |
1da177e4 LT |
3327 | if (rtm->rtm_flags & RTM_F_NOTIFY) |
3328 | rt->rt_flags |= RTCF_NOTIFY; | |
3329 | ||
c36ba660 | 3330 | if (rtm->rtm_flags & RTM_F_LOOKUP_TABLE) |
68e813aa | 3331 | table_id = res.table ? res.table->tb_id : 0; |
c36ba660 | 3332 | |
404eb77e RP |
3333 | /* reset skb for netlink reply msg */ |
3334 | skb_trim(skb, 0); | |
3335 | skb_reset_network_header(skb); | |
3336 | skb_reset_transport_header(skb); | |
3337 | skb_reset_mac_header(skb); | |
3338 | ||
bc3aae2b | 3339 | if (rtm->rtm_flags & RTM_F_FIB_MATCH) { |
1e301fd0 IS |
3340 | struct fib_rt_info fri; |
3341 | ||
bc3aae2b RP |
3342 | if (!res.fi) { |
3343 | err = fib_props[res.type].error; | |
3344 | if (!err) | |
3345 | err = -EHOSTUNREACH; | |
404eb77e | 3346 | goto errout_rcu; |
bc3aae2b | 3347 | } |
1e301fd0 IS |
3348 | fri.fi = res.fi; |
3349 | fri.tb_id = table_id; | |
3350 | fri.dst = res.prefix; | |
3351 | fri.dst_len = res.prefixlen; | |
888ade8f | 3352 | fri.dscp = inet_dsfield_to_dscp(fl4.flowi4_tos); |
1e301fd0 | 3353 | fri.type = rt->rt_type; |
90b93f1b IS |
3354 | fri.offload = 0; |
3355 | fri.trap = 0; | |
36c5100e | 3356 | fri.offload_failed = 0; |
90b93f1b IS |
3357 | if (res.fa_head) { |
3358 | struct fib_alias *fa; | |
3359 | ||
3360 | hlist_for_each_entry_rcu(fa, res.fa_head, fa_list) { | |
3361 | u8 slen = 32 - fri.dst_len; | |
3362 | ||
3363 | if (fa->fa_slen == slen && | |
3364 | fa->tb_id == fri.tb_id && | |
888ade8f | 3365 | fa->fa_dscp == fri.dscp && |
90b93f1b IS |
3366 | fa->fa_info == res.fi && |
3367 | fa->fa_type == fri.type) { | |
9fcf986c ED |
3368 | fri.offload = READ_ONCE(fa->offload); |
3369 | fri.trap = READ_ONCE(fa->trap); | |
0add5c59 BP |
3370 | fri.offload_failed = |
3371 | READ_ONCE(fa->offload_failed); | |
90b93f1b IS |
3372 | break; |
3373 | } | |
3374 | } | |
3375 | } | |
b6179813 | 3376 | err = fib_dump_info(skb, NETLINK_CB(in_skb).portid, |
1e301fd0 | 3377 | nlh->nlmsg_seq, RTM_NEWROUTE, &fri, 0); |
bc3aae2b | 3378 | } else { |
404eb77e | 3379 | err = rt_fill_info(net, dst, src, rt, table_id, &fl4, skb, |
e93fb3e9 JF |
3380 | NETLINK_CB(in_skb).portid, |
3381 | nlh->nlmsg_seq, 0); | |
bc3aae2b | 3382 | } |
7b46a644 | 3383 | if (err < 0) |
404eb77e | 3384 | goto errout_rcu; |
1da177e4 | 3385 | |
3765d35e DA |
3386 | rcu_read_unlock(); |
3387 | ||
15e47304 | 3388 | err = rtnl_unicast(skb, net, NETLINK_CB(in_skb).portid); |
1da177e4 | 3389 | |
d889ce3b | 3390 | errout_free: |
404eb77e RP |
3391 | return err; |
3392 | errout_rcu: | |
3765d35e | 3393 | rcu_read_unlock(); |
1da177e4 | 3394 | kfree_skb(skb); |
404eb77e | 3395 | goto errout_free; |
1da177e4 LT |
3396 | } |
3397 | ||
1da177e4 LT |
3398 | void ip_rt_multicast_event(struct in_device *in_dev) |
3399 | { | |
4ccfe6d4 | 3400 | rt_cache_flush(dev_net(in_dev->dev)); |
1da177e4 LT |
3401 | } |
3402 | ||
3403 | #ifdef CONFIG_SYSCTL | |
082c7ca4 G |
3404 | static int ip_rt_gc_interval __read_mostly = 60 * HZ; |
3405 | static int ip_rt_gc_min_interval __read_mostly = HZ / 2; | |
3406 | static int ip_rt_gc_elasticity __read_mostly = 8; | |
773daa3c | 3407 | static int ip_min_valid_pmtu __read_mostly = IPV4_MIN_MTU; |
082c7ca4 | 3408 | |
fe2c6338 | 3409 | static int ipv4_sysctl_rtcache_flush(struct ctl_table *__ctl, int write, |
32927393 | 3410 | void *buffer, size_t *lenp, loff_t *ppos) |
1da177e4 | 3411 | { |
5aad1de5 TT |
3412 | struct net *net = (struct net *)__ctl->extra1; |
3413 | ||
1da177e4 | 3414 | if (write) { |
5aad1de5 TT |
3415 | rt_cache_flush(net); |
3416 | fnhe_genid_bump(net); | |
1da177e4 | 3417 | return 0; |
e905a9ed | 3418 | } |
1da177e4 LT |
3419 | |
3420 | return -EINVAL; | |
3421 | } | |
3422 | ||
fe2c6338 | 3423 | static struct ctl_table ipv4_route_table[] = { |
1da177e4 | 3424 | { |
1da177e4 LT |
3425 | .procname = "gc_thresh", |
3426 | .data = &ipv4_dst_ops.gc_thresh, | |
3427 | .maxlen = sizeof(int), | |
3428 | .mode = 0644, | |
6d9f239a | 3429 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3430 | }, |
3431 | { | |
1da177e4 LT |
3432 | .procname = "max_size", |
3433 | .data = &ip_rt_max_size, | |
3434 | .maxlen = sizeof(int), | |
3435 | .mode = 0644, | |
6d9f239a | 3436 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3437 | }, |
3438 | { | |
3439 | /* Deprecated. Use gc_min_interval_ms */ | |
e905a9ed | 3440 | |
1da177e4 LT |
3441 | .procname = "gc_min_interval", |
3442 | .data = &ip_rt_gc_min_interval, | |
3443 | .maxlen = sizeof(int), | |
3444 | .mode = 0644, | |
6d9f239a | 3445 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 LT |
3446 | }, |
3447 | { | |
1da177e4 LT |
3448 | .procname = "gc_min_interval_ms", |
3449 | .data = &ip_rt_gc_min_interval, | |
3450 | .maxlen = sizeof(int), | |
3451 | .mode = 0644, | |
6d9f239a | 3452 | .proc_handler = proc_dointvec_ms_jiffies, |
1da177e4 LT |
3453 | }, |
3454 | { | |
1da177e4 LT |
3455 | .procname = "gc_timeout", |
3456 | .data = &ip_rt_gc_timeout, | |
3457 | .maxlen = sizeof(int), | |
3458 | .mode = 0644, | |
6d9f239a | 3459 | .proc_handler = proc_dointvec_jiffies, |
1da177e4 | 3460 | }, |
9f28a2fc ED |
3461 | { |
3462 | .procname = "gc_interval", | |
3463 | .data = &ip_rt_gc_interval, | |
3464 | .maxlen = sizeof(int), | |
3465 | .mode = 0644, | |
3466 | .proc_handler = proc_dointvec_jiffies, | |
3467 | }, | |
1da177e4 | 3468 | { |
1da177e4 LT |
3469 | .procname = "redirect_load", |
3470 | .data = &ip_rt_redirect_load, | |
3471 | .maxlen = sizeof(int), | |
3472 | .mode = 0644, | |
6d9f239a | 3473 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3474 | }, |
3475 | { | |
1da177e4 LT |
3476 | .procname = "redirect_number", |
3477 | .data = &ip_rt_redirect_number, | |
3478 | .maxlen = sizeof(int), | |
3479 | .mode = 0644, | |
6d9f239a | 3480 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3481 | }, |
3482 | { | |
1da177e4 LT |
3483 | .procname = "redirect_silence", |
3484 | .data = &ip_rt_redirect_silence, | |
3485 | .maxlen = sizeof(int), | |
3486 | .mode = 0644, | |
6d9f239a | 3487 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3488 | }, |
3489 | { | |
1da177e4 LT |
3490 | .procname = "error_cost", |
3491 | .data = &ip_rt_error_cost, | |
3492 | .maxlen = sizeof(int), | |
3493 | .mode = 0644, | |
6d9f239a | 3494 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3495 | }, |
3496 | { | |
1da177e4 LT |
3497 | .procname = "error_burst", |
3498 | .data = &ip_rt_error_burst, | |
3499 | .maxlen = sizeof(int), | |
3500 | .mode = 0644, | |
6d9f239a | 3501 | .proc_handler = proc_dointvec, |
1da177e4 LT |
3502 | }, |
3503 | { | |
1da177e4 LT |
3504 | .procname = "gc_elasticity", |
3505 | .data = &ip_rt_gc_elasticity, | |
3506 | .maxlen = sizeof(int), | |
3507 | .mode = 0644, | |
6d9f239a | 3508 | .proc_handler = proc_dointvec, |
1da177e4 | 3509 | }, |
f8572d8f | 3510 | { } |
1da177e4 | 3511 | }; |
39a23e75 | 3512 | |
5cdda5f1 CB |
3513 | static const char ipv4_route_flush_procname[] = "flush"; |
3514 | ||
1de6b15a | 3515 | static struct ctl_table ipv4_route_netns_table[] = { |
39a23e75 | 3516 | { |
5cdda5f1 | 3517 | .procname = ipv4_route_flush_procname, |
39a23e75 DL |
3518 | .maxlen = sizeof(int), |
3519 | .mode = 0200, | |
6d9f239a | 3520 | .proc_handler = ipv4_sysctl_rtcache_flush, |
39a23e75 | 3521 | }, |
1de6b15a | 3522 | { |
3523 | .procname = "min_pmtu", | |
3524 | .data = &init_net.ipv4.ip_rt_min_pmtu, | |
3525 | .maxlen = sizeof(int), | |
3526 | .mode = 0644, | |
3527 | .proc_handler = proc_dointvec_minmax, | |
3528 | .extra1 = &ip_min_valid_pmtu, | |
3529 | }, | |
1135fad2 | 3530 | { |
3531 | .procname = "mtu_expires", | |
3532 | .data = &init_net.ipv4.ip_rt_mtu_expires, | |
3533 | .maxlen = sizeof(int), | |
3534 | .mode = 0644, | |
3535 | .proc_handler = proc_dointvec_jiffies, | |
3536 | }, | |
2e9589ff | 3537 | { |
3538 | .procname = "min_adv_mss", | |
3539 | .data = &init_net.ipv4.ip_rt_min_advmss, | |
3540 | .maxlen = sizeof(int), | |
3541 | .mode = 0644, | |
3542 | .proc_handler = proc_dointvec, | |
3543 | }, | |
f8572d8f | 3544 | { }, |
39a23e75 DL |
3545 | }; |
3546 | ||
3547 | static __net_init int sysctl_route_net_init(struct net *net) | |
3548 | { | |
3549 | struct ctl_table *tbl; | |
c899710f | 3550 | size_t table_size = ARRAY_SIZE(ipv4_route_netns_table); |
39a23e75 | 3551 | |
1de6b15a | 3552 | tbl = ipv4_route_netns_table; |
09ad9bc7 | 3553 | if (!net_eq(net, &init_net)) { |
1de6b15a | 3554 | int i; |
3555 | ||
3556 | tbl = kmemdup(tbl, sizeof(ipv4_route_netns_table), GFP_KERNEL); | |
51456b29 | 3557 | if (!tbl) |
39a23e75 | 3558 | goto err_dup; |
464dc801 | 3559 | |
5cdda5f1 CB |
3560 | /* Don't export non-whitelisted sysctls to unprivileged users */ |
3561 | if (net->user_ns != &init_user_ns) { | |
c899710f | 3562 | if (tbl[0].procname != ipv4_route_flush_procname) { |
5cdda5f1 | 3563 | tbl[0].procname = NULL; |
c899710f JG |
3564 | table_size = 0; |
3565 | } | |
5cdda5f1 | 3566 | } |
1de6b15a | 3567 | |
3568 | /* Update the variables to point into the current struct net | |
3569 | * except for the first element flush | |
3570 | */ | |
3571 | for (i = 1; i < ARRAY_SIZE(ipv4_route_netns_table) - 1; i++) | |
3572 | tbl[i].data += (void *)net - (void *)&init_net; | |
39a23e75 DL |
3573 | } |
3574 | tbl[0].extra1 = net; | |
3575 | ||
c899710f JG |
3576 | net->ipv4.route_hdr = register_net_sysctl_sz(net, "net/ipv4/route", |
3577 | tbl, table_size); | |
51456b29 | 3578 | if (!net->ipv4.route_hdr) |
39a23e75 DL |
3579 | goto err_reg; |
3580 | return 0; | |
3581 | ||
3582 | err_reg: | |
1de6b15a | 3583 | if (tbl != ipv4_route_netns_table) |
39a23e75 DL |
3584 | kfree(tbl); |
3585 | err_dup: | |
3586 | return -ENOMEM; | |
3587 | } | |
3588 | ||
3589 | static __net_exit void sysctl_route_net_exit(struct net *net) | |
3590 | { | |
3591 | struct ctl_table *tbl; | |
3592 | ||
3593 | tbl = net->ipv4.route_hdr->ctl_table_arg; | |
3594 | unregister_net_sysctl_table(net->ipv4.route_hdr); | |
1de6b15a | 3595 | BUG_ON(tbl == ipv4_route_netns_table); |
39a23e75 DL |
3596 | kfree(tbl); |
3597 | } | |
3598 | ||
3599 | static __net_initdata struct pernet_operations sysctl_route_ops = { | |
3600 | .init = sysctl_route_net_init, | |
3601 | .exit = sysctl_route_net_exit, | |
3602 | }; | |
1da177e4 LT |
3603 | #endif |
3604 | ||
1de6b15a | 3605 | static __net_init int netns_ip_rt_init(struct net *net) |
3606 | { | |
3607 | /* Set default value for namespaceified sysctls */ | |
3608 | net->ipv4.ip_rt_min_pmtu = DEFAULT_MIN_PMTU; | |
1135fad2 | 3609 | net->ipv4.ip_rt_mtu_expires = DEFAULT_MTU_EXPIRES; |
2e9589ff | 3610 | net->ipv4.ip_rt_min_advmss = DEFAULT_MIN_ADVMSS; |
1de6b15a | 3611 | return 0; |
3612 | } | |
3613 | ||
3614 | static struct pernet_operations __net_initdata ip_rt_ops = { | |
3615 | .init = netns_ip_rt_init, | |
3616 | }; | |
3617 | ||
3ee94372 | 3618 | static __net_init int rt_genid_init(struct net *net) |
9f5e97e5 | 3619 | { |
ca4c3fc2 | 3620 | atomic_set(&net->ipv4.rt_genid, 0); |
5aad1de5 | 3621 | atomic_set(&net->fnhe_genid, 0); |
a251c17a | 3622 | atomic_set(&net->ipv4.dev_addr_genid, get_random_u32()); |
9f5e97e5 DL |
3623 | return 0; |
3624 | } | |
3625 | ||
3ee94372 NH |
3626 | static __net_initdata struct pernet_operations rt_genid_ops = { |
3627 | .init = rt_genid_init, | |
9f5e97e5 DL |
3628 | }; |
3629 | ||
c3426b47 DM |
3630 | static int __net_init ipv4_inetpeer_init(struct net *net) |
3631 | { | |
3632 | struct inet_peer_base *bp = kmalloc(sizeof(*bp), GFP_KERNEL); | |
3633 | ||
3634 | if (!bp) | |
3635 | return -ENOMEM; | |
3636 | inet_peer_base_init(bp); | |
3637 | net->ipv4.peers = bp; | |
3638 | return 0; | |
3639 | } | |
3640 | ||
3641 | static void __net_exit ipv4_inetpeer_exit(struct net *net) | |
3642 | { | |
3643 | struct inet_peer_base *bp = net->ipv4.peers; | |
3644 | ||
3645 | net->ipv4.peers = NULL; | |
56a6b248 | 3646 | inetpeer_invalidate_tree(bp); |
c3426b47 DM |
3647 | kfree(bp); |
3648 | } | |
3649 | ||
3650 | static __net_initdata struct pernet_operations ipv4_inetpeer_ops = { | |
3651 | .init = ipv4_inetpeer_init, | |
3652 | .exit = ipv4_inetpeer_exit, | |
3653 | }; | |
9f5e97e5 | 3654 | |
c7066f70 | 3655 | #ifdef CONFIG_IP_ROUTE_CLASSID |
7d720c3e | 3656 | struct ip_rt_acct __percpu *ip_rt_acct __read_mostly; |
c7066f70 | 3657 | #endif /* CONFIG_IP_ROUTE_CLASSID */ |
1da177e4 | 3658 | |
1da177e4 LT |
3659 | int __init ip_rt_init(void) |
3660 | { | |
aa6dd211 | 3661 | void *idents_hash; |
5055c371 | 3662 | int cpu; |
1da177e4 | 3663 | |
aa6dd211 ED |
3664 | /* For modern hosts, this will use 2 MB of memory */ |
3665 | idents_hash = alloc_large_system_hash("IP idents", | |
3666 | sizeof(*ip_idents) + sizeof(*ip_tstamps), | |
3667 | 0, | |
3668 | 16, /* one bucket per 64 KB */ | |
3669 | HASH_ZERO, | |
3670 | NULL, | |
3671 | &ip_idents_mask, | |
3672 | 2048, | |
3673 | 256*1024); | |
3674 | ||
3675 | ip_idents = idents_hash; | |
73f156a6 | 3676 | |
197173db | 3677 | get_random_bytes(ip_idents, (ip_idents_mask + 1) * sizeof(*ip_idents)); |
73f156a6 | 3678 | |
aa6dd211 | 3679 | ip_tstamps = idents_hash + (ip_idents_mask + 1) * sizeof(*ip_idents); |
355b590c | 3680 | |
5055c371 ED |
3681 | for_each_possible_cpu(cpu) { |
3682 | struct uncached_list *ul = &per_cpu(rt_uncached_list, cpu); | |
3683 | ||
3684 | INIT_LIST_HEAD(&ul->head); | |
29e5375d | 3685 | INIT_LIST_HEAD(&ul->quarantine); |
5055c371 ED |
3686 | spin_lock_init(&ul->lock); |
3687 | } | |
c7066f70 | 3688 | #ifdef CONFIG_IP_ROUTE_CLASSID |
0dcec8c2 | 3689 | ip_rt_acct = __alloc_percpu(256 * sizeof(struct ip_rt_acct), __alignof__(struct ip_rt_acct)); |
1da177e4 LT |
3690 | if (!ip_rt_acct) |
3691 | panic("IP: failed to allocate ip_rt_acct\n"); | |
1da177e4 LT |
3692 | #endif |
3693 | ||
7eb2bc24 KC |
3694 | ipv4_dst_ops.kmem_cachep = KMEM_CACHE(rtable, |
3695 | SLAB_HWCACHE_ALIGN | SLAB_PANIC); | |
1da177e4 | 3696 | |
14e50e57 DM |
3697 | ipv4_dst_blackhole_ops.kmem_cachep = ipv4_dst_ops.kmem_cachep; |
3698 | ||
fc66f95c ED |
3699 | if (dst_entries_init(&ipv4_dst_ops) < 0) |
3700 | panic("IP: failed to allocate ipv4_dst_ops counter\n"); | |
3701 | ||
3702 | if (dst_entries_init(&ipv4_dst_blackhole_ops) < 0) | |
3703 | panic("IP: failed to allocate ipv4_dst_blackhole_ops counter\n"); | |
3704 | ||
89aef892 DM |
3705 | ipv4_dst_ops.gc_thresh = ~0; |
3706 | ip_rt_max_size = INT_MAX; | |
1da177e4 | 3707 | |
1da177e4 LT |
3708 | devinet_init(); |
3709 | ip_fib_init(); | |
3710 | ||
73b38711 | 3711 | if (ip_rt_proc_init()) |
058bd4d2 | 3712 | pr_err("Unable to create route proc files\n"); |
1da177e4 LT |
3713 | #ifdef CONFIG_XFRM |
3714 | xfrm_init(); | |
703fb94e | 3715 | xfrm4_init(); |
1da177e4 | 3716 | #endif |
394f51ab FW |
3717 | rtnl_register(PF_INET, RTM_GETROUTE, inet_rtm_getroute, NULL, |
3718 | RTNL_FLAG_DOIT_UNLOCKED); | |
63f3444f | 3719 | |
39a23e75 DL |
3720 | #ifdef CONFIG_SYSCTL |
3721 | register_pernet_subsys(&sysctl_route_ops); | |
3722 | #endif | |
1de6b15a | 3723 | register_pernet_subsys(&ip_rt_ops); |
3ee94372 | 3724 | register_pernet_subsys(&rt_genid_ops); |
c3426b47 | 3725 | register_pernet_subsys(&ipv4_inetpeer_ops); |
1bcdca3f | 3726 | return 0; |
1da177e4 LT |
3727 | } |
3728 | ||
a1bc6eb4 | 3729 | #ifdef CONFIG_SYSCTL |
eeb61f71 AV |
3730 | /* |
3731 | * We really need to sanitize the damn ipv4 init order, then all | |
3732 | * this nonsense will go away. | |
3733 | */ | |
3734 | void __init ip_static_sysctl_init(void) | |
3735 | { | |
4e5ca785 | 3736 | register_net_sysctl(&init_net, "net/ipv4/route", ipv4_route_table); |
eeb61f71 | 3737 | } |
a1bc6eb4 | 3738 | #endif |