Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * INET An implementation of the TCP/IP protocol suite for the LINUX | |
3 | * operating system. INET is implemented using the BSD Socket | |
4 | * interface as the means of communication with the user level. | |
5 | * | |
6 | * The User Datagram Protocol (UDP). | |
7 | * | |
02c30a84 | 8 | * Authors: Ross Biro |
1da177e4 LT |
9 | * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> |
10 | * Arnt Gulbrandsen, <agulbra@nvg.unit.no> | |
113aa838 | 11 | * Alan Cox, <alan@lxorguk.ukuu.org.uk> |
1da177e4 LT |
12 | * Hirokazu Takahashi, <taka@valinux.co.jp> |
13 | * | |
14 | * Fixes: | |
15 | * Alan Cox : verify_area() calls | |
16 | * Alan Cox : stopped close while in use off icmp | |
17 | * messages. Not a fix but a botch that | |
18 | * for udp at least is 'valid'. | |
19 | * Alan Cox : Fixed icmp handling properly | |
20 | * Alan Cox : Correct error for oversized datagrams | |
e905a9ed YH |
21 | * Alan Cox : Tidied select() semantics. |
22 | * Alan Cox : udp_err() fixed properly, also now | |
1da177e4 LT |
23 | * select and read wake correctly on errors |
24 | * Alan Cox : udp_send verify_area moved to avoid mem leak | |
25 | * Alan Cox : UDP can count its memory | |
26 | * Alan Cox : send to an unknown connection causes | |
27 | * an ECONNREFUSED off the icmp, but | |
28 | * does NOT close. | |
29 | * Alan Cox : Switched to new sk_buff handlers. No more backlog! | |
30 | * Alan Cox : Using generic datagram code. Even smaller and the PEEK | |
31 | * bug no longer crashes it. | |
32 | * Fred Van Kempen : Net2e support for sk->broadcast. | |
33 | * Alan Cox : Uses skb_free_datagram | |
34 | * Alan Cox : Added get/set sockopt support. | |
35 | * Alan Cox : Broadcasting without option set returns EACCES. | |
36 | * Alan Cox : No wakeup calls. Instead we now use the callbacks. | |
37 | * Alan Cox : Use ip_tos and ip_ttl | |
38 | * Alan Cox : SNMP Mibs | |
39 | * Alan Cox : MSG_DONTROUTE, and 0.0.0.0 support. | |
40 | * Matt Dillon : UDP length checks. | |
41 | * Alan Cox : Smarter af_inet used properly. | |
42 | * Alan Cox : Use new kernel side addressing. | |
43 | * Alan Cox : Incorrect return on truncated datagram receive. | |
44 | * Arnt Gulbrandsen : New udp_send and stuff | |
45 | * Alan Cox : Cache last socket | |
46 | * Alan Cox : Route cache | |
47 | * Jon Peatfield : Minor efficiency fix to sendto(). | |
48 | * Mike Shaver : RFC1122 checks. | |
49 | * Alan Cox : Nonblocking error fix. | |
50 | * Willy Konynenberg : Transparent proxying support. | |
51 | * Mike McLagan : Routing by source | |
52 | * David S. Miller : New socket lookup architecture. | |
53 | * Last socket cache retained as it | |
54 | * does have a high hit rate. | |
55 | * Olaf Kirch : Don't linearise iovec on sendmsg. | |
56 | * Andi Kleen : Some cleanups, cache destination entry | |
e905a9ed | 57 | * for connect. |
1da177e4 LT |
58 | * Vitaly E. Lavrov : Transparent proxy revived after year coma. |
59 | * Melvin Smith : Check msg_name not msg_namelen in sendto(), | |
60 | * return ENOTCONN for unconnected sockets (POSIX) | |
61 | * Janos Farkas : don't deliver multi/broadcasts to a different | |
62 | * bound-to-device socket | |
63 | * Hirokazu Takahashi : HW checksumming for outgoing UDP | |
64 | * datagrams. | |
65 | * Hirokazu Takahashi : sendfile() on UDP works now. | |
66 | * Arnaldo C. Melo : convert /proc/net/udp to seq_file | |
67 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
68 | * Alexey Kuznetsov: allow both IPv4 and IPv6 sockets to bind | |
69 | * a single port at the same time. | |
70 | * Derek Atkins <derek@ihtfp.com>: Add Encapulation Support | |
342f0234 | 71 | * James Chapman : Add L2TP encapsulation type. |
1da177e4 LT |
72 | * |
73 | * | |
74 | * This program is free software; you can redistribute it and/or | |
75 | * modify it under the terms of the GNU General Public License | |
76 | * as published by the Free Software Foundation; either version | |
77 | * 2 of the License, or (at your option) any later version. | |
78 | */ | |
e905a9ed | 79 | |
1da177e4 LT |
80 | #include <asm/system.h> |
81 | #include <asm/uaccess.h> | |
82 | #include <asm/ioctls.h> | |
95766fff | 83 | #include <linux/bootmem.h> |
8203efb3 ED |
84 | #include <linux/highmem.h> |
85 | #include <linux/swap.h> | |
1da177e4 LT |
86 | #include <linux/types.h> |
87 | #include <linux/fcntl.h> | |
88 | #include <linux/module.h> | |
89 | #include <linux/socket.h> | |
90 | #include <linux/sockios.h> | |
14c85021 | 91 | #include <linux/igmp.h> |
1da177e4 LT |
92 | #include <linux/in.h> |
93 | #include <linux/errno.h> | |
94 | #include <linux/timer.h> | |
95 | #include <linux/mm.h> | |
1da177e4 | 96 | #include <linux/inet.h> |
1da177e4 | 97 | #include <linux/netdevice.h> |
c752f073 | 98 | #include <net/tcp_states.h> |
1da177e4 LT |
99 | #include <linux/skbuff.h> |
100 | #include <linux/proc_fs.h> | |
101 | #include <linux/seq_file.h> | |
457c4cbc | 102 | #include <net/net_namespace.h> |
1da177e4 LT |
103 | #include <net/icmp.h> |
104 | #include <net/route.h> | |
1da177e4 LT |
105 | #include <net/checksum.h> |
106 | #include <net/xfrm.h> | |
ba4e58ec | 107 | #include "udp_impl.h" |
1da177e4 | 108 | |
f86dcc5a | 109 | struct udp_table udp_table __read_mostly; |
645ca708 | 110 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 111 | |
95766fff | 112 | int sysctl_udp_mem[3] __read_mostly; |
95766fff | 113 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
114 | |
115 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 116 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
117 | |
118 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
119 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
120 | ||
121 | atomic_t udp_memory_allocated; | |
122 | EXPORT_SYMBOL(udp_memory_allocated); | |
123 | ||
f86dcc5a ED |
124 | #define MAX_UDP_PORTS 65536 |
125 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 126 | |
f24d43c0 | 127 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 128 | const struct udp_hslot *hslot, |
98322f22 | 129 | unsigned long *bitmap, |
f24d43c0 ED |
130 | struct sock *sk, |
131 | int (*saddr_comp)(const struct sock *sk1, | |
f86dcc5a ED |
132 | const struct sock *sk2), |
133 | unsigned int log) | |
1da177e4 | 134 | { |
f24d43c0 | 135 | struct sock *sk2; |
88ab1932 | 136 | struct hlist_nulls_node *node; |
25030a7f | 137 | |
88ab1932 | 138 | sk_nulls_for_each(sk2, node, &hslot->head) |
9d4fb27d JP |
139 | if (net_eq(sock_net(sk2), net) && |
140 | sk2 != sk && | |
d4cada4a | 141 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
9d4fb27d JP |
142 | (!sk2->sk_reuse || !sk->sk_reuse) && |
143 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
144 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
98322f22 ED |
145 | (*saddr_comp)(sk, sk2)) { |
146 | if (bitmap) | |
d4cada4a ED |
147 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
148 | bitmap); | |
98322f22 ED |
149 | else |
150 | return 1; | |
151 | } | |
25030a7f GR |
152 | return 0; |
153 | } | |
154 | ||
30fff923 ED |
155 | /* |
156 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
157 | * can insert/delete a socket with local_port == num | |
158 | */ | |
159 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
160 | struct udp_hslot *hslot2, | |
161 | struct sock *sk, | |
162 | int (*saddr_comp)(const struct sock *sk1, | |
163 | const struct sock *sk2)) | |
164 | { | |
165 | struct sock *sk2; | |
166 | struct hlist_nulls_node *node; | |
167 | int res = 0; | |
168 | ||
169 | spin_lock(&hslot2->lock); | |
170 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) | |
9d4fb27d JP |
171 | if (net_eq(sock_net(sk2), net) && |
172 | sk2 != sk && | |
173 | (udp_sk(sk2)->udp_port_hash == num) && | |
174 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
175 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
176 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
30fff923 ED |
177 | (*saddr_comp)(sk, sk2)) { |
178 | res = 1; | |
179 | break; | |
180 | } | |
181 | spin_unlock(&hslot2->lock); | |
182 | return res; | |
183 | } | |
184 | ||
25030a7f | 185 | /** |
6ba5a3c5 | 186 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
187 | * |
188 | * @sk: socket struct in question | |
189 | * @snum: port number to look up | |
df2bc459 | 190 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
30fff923 ED |
191 | * @hash2_nulladdr: AF-dependant hash value in secondary hash chains, |
192 | * with NULL address | |
25030a7f | 193 | */ |
6ba5a3c5 | 194 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 195 | int (*saddr_comp)(const struct sock *sk1, |
30fff923 ED |
196 | const struct sock *sk2), |
197 | unsigned int hash2_nulladdr) | |
25030a7f | 198 | { |
512615b6 | 199 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 200 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 201 | int error = 1; |
3b1e0a65 | 202 | struct net *net = sock_net(sk); |
1da177e4 | 203 | |
32c1da70 | 204 | if (!snum) { |
9088c560 ED |
205 | int low, high, remaining; |
206 | unsigned rand; | |
98322f22 ED |
207 | unsigned short first, last; |
208 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 209 | |
227b60f5 | 210 | inet_get_local_port_range(&low, &high); |
a25de534 | 211 | remaining = (high - low) + 1; |
227b60f5 | 212 | |
9088c560 | 213 | rand = net_random(); |
98322f22 ED |
214 | first = (((u64)rand * remaining) >> 32) + low; |
215 | /* | |
216 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
217 | */ | |
f86dcc5a | 218 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
219 | last = first + udptable->mask + 1; |
220 | do { | |
f86dcc5a | 221 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 222 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 223 | spin_lock_bh(&hslot->lock); |
98322f22 | 224 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 225 | saddr_comp, udptable->log); |
98322f22 ED |
226 | |
227 | snum = first; | |
228 | /* | |
229 | * Iterate on all possible values of snum for this hash. | |
230 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
231 | * give us randomization and full range coverage. | |
232 | */ | |
9088c560 | 233 | do { |
98322f22 | 234 | if (low <= snum && snum <= high && |
f86dcc5a | 235 | !test_bit(snum >> udptable->log, bitmap)) |
98322f22 ED |
236 | goto found; |
237 | snum += rand; | |
238 | } while (snum != first); | |
239 | spin_unlock_bh(&hslot->lock); | |
5781b235 | 240 | } while (++first != last); |
98322f22 | 241 | goto fail; |
645ca708 | 242 | } else { |
f86dcc5a | 243 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 244 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
245 | if (hslot->count > 10) { |
246 | int exist; | |
247 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
248 | ||
249 | slot2 &= udptable->mask; | |
250 | hash2_nulladdr &= udptable->mask; | |
251 | ||
252 | hslot2 = udp_hashslot2(udptable, slot2); | |
253 | if (hslot->count < hslot2->count) | |
254 | goto scan_primary_hash; | |
255 | ||
256 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
257 | sk, saddr_comp); | |
258 | if (!exist && (hash2_nulladdr != slot2)) { | |
259 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
260 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
261 | sk, saddr_comp); | |
262 | } | |
263 | if (exist) | |
264 | goto fail_unlock; | |
265 | else | |
266 | goto found; | |
267 | } | |
268 | scan_primary_hash: | |
f86dcc5a ED |
269 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
270 | saddr_comp, 0)) | |
645ca708 ED |
271 | goto fail_unlock; |
272 | } | |
98322f22 | 273 | found: |
c720c7e8 | 274 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
275 | udp_sk(sk)->udp_port_hash = snum; |
276 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 277 | if (sk_unhashed(sk)) { |
88ab1932 | 278 | sk_nulls_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 279 | hslot->count++; |
c29a0bc4 | 280 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
281 | |
282 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
283 | spin_lock(&hslot2->lock); | |
284 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
285 | &hslot2->head); | |
286 | hslot2->count++; | |
287 | spin_unlock(&hslot2->lock); | |
1da177e4 | 288 | } |
25030a7f | 289 | error = 0; |
645ca708 ED |
290 | fail_unlock: |
291 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 292 | fail: |
25030a7f GR |
293 | return error; |
294 | } | |
c482c568 | 295 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 296 | |
499923c7 | 297 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
db8dac20 DM |
298 | { |
299 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
300 | ||
c482c568 | 301 | return (!ipv6_only_sock(sk2) && |
c720c7e8 ED |
302 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
303 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); | |
db8dac20 DM |
304 | } |
305 | ||
d4cada4a ED |
306 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
307 | unsigned int port) | |
308 | { | |
309 | return jhash_1word(saddr, net_hash_mix(net)) ^ port; | |
310 | } | |
311 | ||
6ba5a3c5 | 312 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 313 | { |
30fff923 ED |
314 | unsigned int hash2_nulladdr = |
315 | udp4_portaddr_hash(sock_net(sk), INADDR_ANY, snum); | |
316 | unsigned int hash2_partial = | |
317 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
318 | ||
d4cada4a | 319 | /* precompute partial secondary hash */ |
30fff923 ED |
320 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
321 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); | |
db8dac20 DM |
322 | } |
323 | ||
645ca708 ED |
324 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
325 | unsigned short hnum, | |
326 | __be16 sport, __be32 daddr, __be16 dport, int dif) | |
327 | { | |
328 | int score = -1; | |
329 | ||
d4cada4a | 330 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
331 | !ipv6_only_sock(sk)) { |
332 | struct inet_sock *inet = inet_sk(sk); | |
333 | ||
334 | score = (sk->sk_family == PF_INET ? 1 : 0); | |
c720c7e8 ED |
335 | if (inet->inet_rcv_saddr) { |
336 | if (inet->inet_rcv_saddr != daddr) | |
645ca708 ED |
337 | return -1; |
338 | score += 2; | |
339 | } | |
c720c7e8 ED |
340 | if (inet->inet_daddr) { |
341 | if (inet->inet_daddr != saddr) | |
645ca708 ED |
342 | return -1; |
343 | score += 2; | |
344 | } | |
c720c7e8 ED |
345 | if (inet->inet_dport) { |
346 | if (inet->inet_dport != sport) | |
645ca708 ED |
347 | return -1; |
348 | score += 2; | |
349 | } | |
350 | if (sk->sk_bound_dev_if) { | |
351 | if (sk->sk_bound_dev_if != dif) | |
352 | return -1; | |
353 | score += 2; | |
354 | } | |
355 | } | |
356 | return score; | |
357 | } | |
358 | ||
5051ebd2 ED |
359 | /* |
360 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) | |
361 | */ | |
362 | #define SCORE2_MAX (1 + 2 + 2 + 2) | |
363 | static inline int compute_score2(struct sock *sk, struct net *net, | |
364 | __be32 saddr, __be16 sport, | |
365 | __be32 daddr, unsigned int hnum, int dif) | |
366 | { | |
367 | int score = -1; | |
368 | ||
369 | if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { | |
370 | struct inet_sock *inet = inet_sk(sk); | |
371 | ||
372 | if (inet->inet_rcv_saddr != daddr) | |
373 | return -1; | |
374 | if (inet->inet_num != hnum) | |
375 | return -1; | |
376 | ||
377 | score = (sk->sk_family == PF_INET ? 1 : 0); | |
378 | if (inet->inet_daddr) { | |
379 | if (inet->inet_daddr != saddr) | |
380 | return -1; | |
381 | score += 2; | |
382 | } | |
383 | if (inet->inet_dport) { | |
384 | if (inet->inet_dport != sport) | |
385 | return -1; | |
386 | score += 2; | |
387 | } | |
388 | if (sk->sk_bound_dev_if) { | |
389 | if (sk->sk_bound_dev_if != dif) | |
390 | return -1; | |
391 | score += 2; | |
392 | } | |
393 | } | |
394 | return score; | |
395 | } | |
396 | ||
5051ebd2 ED |
397 | |
398 | /* called with read_rcu_lock() */ | |
399 | static struct sock *udp4_lib_lookup2(struct net *net, | |
400 | __be32 saddr, __be16 sport, | |
401 | __be32 daddr, unsigned int hnum, int dif, | |
402 | struct udp_hslot *hslot2, unsigned int slot2) | |
403 | { | |
404 | struct sock *sk, *result; | |
405 | struct hlist_nulls_node *node; | |
406 | int score, badness; | |
407 | ||
408 | begin: | |
409 | result = NULL; | |
410 | badness = -1; | |
411 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
412 | score = compute_score2(sk, net, saddr, sport, | |
413 | daddr, hnum, dif); | |
414 | if (score > badness) { | |
415 | result = sk; | |
416 | badness = score; | |
417 | if (score == SCORE2_MAX) | |
418 | goto exact_match; | |
419 | } | |
420 | } | |
421 | /* | |
422 | * if the nulls value we got at the end of this lookup is | |
423 | * not the expected one, we must restart lookup. | |
424 | * We probably met an item that was moved to another chain. | |
425 | */ | |
426 | if (get_nulls_value(node) != slot2) | |
427 | goto begin; | |
428 | ||
429 | if (result) { | |
430 | exact_match: | |
431 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
432 | result = NULL; | |
433 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
434 | daddr, hnum, dif) < badness)) { | |
435 | sock_put(result); | |
436 | goto begin; | |
437 | } | |
438 | } | |
439 | return result; | |
440 | } | |
441 | ||
db8dac20 DM |
442 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
443 | * harder than this. -DaveM | |
444 | */ | |
445 | static struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, | |
446 | __be16 sport, __be32 daddr, __be16 dport, | |
645ca708 | 447 | int dif, struct udp_table *udptable) |
db8dac20 | 448 | { |
271b72c7 | 449 | struct sock *sk, *result; |
88ab1932 | 450 | struct hlist_nulls_node *node; |
db8dac20 | 451 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
452 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
453 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
271b72c7 | 454 | int score, badness; |
645ca708 | 455 | |
271b72c7 | 456 | rcu_read_lock(); |
5051ebd2 ED |
457 | if (hslot->count > 10) { |
458 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
459 | slot2 = hash2 & udptable->mask; | |
460 | hslot2 = &udptable->hash2[slot2]; | |
461 | if (hslot->count < hslot2->count) | |
462 | goto begin; | |
463 | ||
464 | result = udp4_lib_lookup2(net, saddr, sport, | |
465 | daddr, hnum, dif, | |
466 | hslot2, slot2); | |
467 | if (!result) { | |
468 | hash2 = udp4_portaddr_hash(net, INADDR_ANY, hnum); | |
469 | slot2 = hash2 & udptable->mask; | |
470 | hslot2 = &udptable->hash2[slot2]; | |
471 | if (hslot->count < hslot2->count) | |
472 | goto begin; | |
473 | ||
474 | result = udp4_lib_lookup2(net, INADDR_ANY, sport, | |
475 | daddr, hnum, dif, | |
476 | hslot2, slot2); | |
477 | } | |
478 | rcu_read_unlock(); | |
479 | return result; | |
480 | } | |
271b72c7 ED |
481 | begin: |
482 | result = NULL; | |
483 | badness = -1; | |
88ab1932 | 484 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
485 | score = compute_score(sk, net, saddr, hnum, sport, |
486 | daddr, dport, dif); | |
487 | if (score > badness) { | |
488 | result = sk; | |
489 | badness = score; | |
db8dac20 DM |
490 | } |
491 | } | |
88ab1932 ED |
492 | /* |
493 | * if the nulls value we got at the end of this lookup is | |
494 | * not the expected one, we must restart lookup. | |
495 | * We probably met an item that was moved to another chain. | |
496 | */ | |
5051ebd2 | 497 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
498 | goto begin; |
499 | ||
271b72c7 ED |
500 | if (result) { |
501 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
502 | result = NULL; | |
503 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, | |
504 | daddr, dport, dif) < badness)) { | |
505 | sock_put(result); | |
506 | goto begin; | |
507 | } | |
508 | } | |
509 | rcu_read_unlock(); | |
db8dac20 DM |
510 | return result; |
511 | } | |
512 | ||
607c4aaf KK |
513 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
514 | __be16 sport, __be16 dport, | |
645ca708 | 515 | struct udp_table *udptable) |
607c4aaf | 516 | { |
23542618 | 517 | struct sock *sk; |
607c4aaf KK |
518 | const struct iphdr *iph = ip_hdr(skb); |
519 | ||
23542618 KK |
520 | if (unlikely(sk = skb_steal_sock(skb))) |
521 | return sk; | |
522 | else | |
adf30907 | 523 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
23542618 KK |
524 | iph->daddr, dport, inet_iif(skb), |
525 | udptable); | |
607c4aaf KK |
526 | } |
527 | ||
bcd41303 KK |
528 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
529 | __be32 daddr, __be16 dport, int dif) | |
530 | { | |
645ca708 | 531 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
bcd41303 KK |
532 | } |
533 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
534 | ||
920a4611 | 535 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
db8dac20 DM |
536 | __be16 loc_port, __be32 loc_addr, |
537 | __be16 rmt_port, __be32 rmt_addr, | |
538 | int dif) | |
539 | { | |
88ab1932 | 540 | struct hlist_nulls_node *node; |
db8dac20 DM |
541 | struct sock *s = sk; |
542 | unsigned short hnum = ntohs(loc_port); | |
543 | ||
88ab1932 | 544 | sk_nulls_for_each_from(s, node) { |
db8dac20 DM |
545 | struct inet_sock *inet = inet_sk(s); |
546 | ||
9d4fb27d JP |
547 | if (!net_eq(sock_net(s), net) || |
548 | udp_sk(s)->udp_port_hash != hnum || | |
549 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
550 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
551 | (inet->inet_rcv_saddr && | |
552 | inet->inet_rcv_saddr != loc_addr) || | |
553 | ipv6_only_sock(s) || | |
db8dac20 DM |
554 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) |
555 | continue; | |
556 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
557 | continue; | |
558 | goto found; | |
559 | } | |
560 | s = NULL; | |
561 | found: | |
562 | return s; | |
563 | } | |
564 | ||
565 | /* | |
566 | * This routine is called by the ICMP module when it gets some | |
567 | * sort of error condition. If err < 0 then the socket should | |
568 | * be closed and the error returned to the user. If err > 0 | |
569 | * it's just the icmp type << 8 | icmp code. | |
570 | * Header points to the ip header of the error packet. We move | |
571 | * on past this. Then (as it used to claim before adjustment) | |
572 | * header points to the first 8 bytes of the udp header. We need | |
573 | * to find the appropriate port. | |
574 | */ | |
575 | ||
645ca708 | 576 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
577 | { |
578 | struct inet_sock *inet; | |
c482c568 ED |
579 | struct iphdr *iph = (struct iphdr *)skb->data; |
580 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); | |
db8dac20 DM |
581 | const int type = icmp_hdr(skb)->type; |
582 | const int code = icmp_hdr(skb)->code; | |
583 | struct sock *sk; | |
584 | int harderr; | |
585 | int err; | |
fd54d716 | 586 | struct net *net = dev_net(skb->dev); |
db8dac20 | 587 | |
fd54d716 | 588 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
db8dac20 DM |
589 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
590 | if (sk == NULL) { | |
dcfc23ca | 591 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
592 | return; /* No socket for error */ |
593 | } | |
594 | ||
595 | err = 0; | |
596 | harderr = 0; | |
597 | inet = inet_sk(sk); | |
598 | ||
599 | switch (type) { | |
600 | default: | |
601 | case ICMP_TIME_EXCEEDED: | |
602 | err = EHOSTUNREACH; | |
603 | break; | |
604 | case ICMP_SOURCE_QUENCH: | |
605 | goto out; | |
606 | case ICMP_PARAMETERPROB: | |
607 | err = EPROTO; | |
608 | harderr = 1; | |
609 | break; | |
610 | case ICMP_DEST_UNREACH: | |
611 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
612 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { | |
613 | err = EMSGSIZE; | |
614 | harderr = 1; | |
615 | break; | |
616 | } | |
617 | goto out; | |
618 | } | |
619 | err = EHOSTUNREACH; | |
620 | if (code <= NR_ICMP_UNREACH) { | |
621 | harderr = icmp_err_convert[code].fatal; | |
622 | err = icmp_err_convert[code].errno; | |
623 | } | |
624 | break; | |
625 | } | |
626 | ||
627 | /* | |
628 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
629 | * 4.1.3.3. | |
630 | */ | |
631 | if (!inet->recverr) { | |
632 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
633 | goto out; | |
634 | } else { | |
c482c568 | 635 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
db8dac20 DM |
636 | } |
637 | sk->sk_err = err; | |
638 | sk->sk_error_report(sk); | |
639 | out: | |
640 | sock_put(sk); | |
641 | } | |
642 | ||
643 | void udp_err(struct sk_buff *skb, u32 info) | |
644 | { | |
645ca708 | 645 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
646 | } |
647 | ||
648 | /* | |
649 | * Throw away all pending data and cancel the corking. Socket is locked. | |
650 | */ | |
36d926b9 | 651 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
652 | { |
653 | struct udp_sock *up = udp_sk(sk); | |
654 | ||
655 | if (up->pending) { | |
656 | up->len = 0; | |
657 | up->pending = 0; | |
658 | ip_flush_pending_frames(sk); | |
659 | } | |
660 | } | |
36d926b9 | 661 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
662 | |
663 | /** | |
664 | * udp4_hwcsum_outgoing - handle outgoing HW checksumming | |
665 | * @sk: socket we are sending on | |
666 | * @skb: sk_buff containing the filled-in UDP header | |
667 | * (checksum field must be zeroed out) | |
668 | */ | |
669 | static void udp4_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
c482c568 | 670 | __be32 src, __be32 dst, int len) |
db8dac20 DM |
671 | { |
672 | unsigned int offset; | |
673 | struct udphdr *uh = udp_hdr(skb); | |
674 | __wsum csum = 0; | |
675 | ||
676 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
677 | /* | |
678 | * Only one fragment on the socket. | |
679 | */ | |
680 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
681 | skb->csum_offset = offsetof(struct udphdr, check); | |
682 | uh->check = ~csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, 0); | |
683 | } else { | |
684 | /* | |
685 | * HW-checksum won't work as there are two or more | |
686 | * fragments on the socket so that all csums of sk_buffs | |
687 | * should be together | |
688 | */ | |
689 | offset = skb_transport_offset(skb); | |
690 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
691 | ||
692 | skb->ip_summed = CHECKSUM_NONE; | |
693 | ||
694 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
695 | csum = csum_add(csum, skb->csum); | |
696 | } | |
697 | ||
698 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); | |
699 | if (uh->check == 0) | |
700 | uh->check = CSUM_MANGLED_0; | |
701 | } | |
702 | } | |
703 | ||
704 | /* | |
705 | * Push out all pending data as one UDP datagram. Socket is locked. | |
706 | */ | |
707 | static int udp_push_pending_frames(struct sock *sk) | |
708 | { | |
709 | struct udp_sock *up = udp_sk(sk); | |
710 | struct inet_sock *inet = inet_sk(sk); | |
711 | struct flowi *fl = &inet->cork.fl; | |
712 | struct sk_buff *skb; | |
713 | struct udphdr *uh; | |
714 | int err = 0; | |
715 | int is_udplite = IS_UDPLITE(sk); | |
716 | __wsum csum = 0; | |
717 | ||
718 | /* Grab the skbuff where UDP header space exists. */ | |
719 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
720 | goto out; | |
721 | ||
722 | /* | |
723 | * Create a UDP header | |
724 | */ | |
725 | uh = udp_hdr(skb); | |
726 | uh->source = fl->fl_ip_sport; | |
727 | uh->dest = fl->fl_ip_dport; | |
728 | uh->len = htons(up->len); | |
729 | uh->check = 0; | |
730 | ||
731 | if (is_udplite) /* UDP-Lite */ | |
732 | csum = udplite_csum_outgoing(sk, skb); | |
733 | ||
734 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ | |
735 | ||
736 | skb->ip_summed = CHECKSUM_NONE; | |
737 | goto send; | |
738 | ||
739 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
740 | ||
c482c568 | 741 | udp4_hwcsum_outgoing(sk, skb, fl->fl4_src, fl->fl4_dst, up->len); |
db8dac20 DM |
742 | goto send; |
743 | ||
744 | } else /* `normal' UDP */ | |
745 | csum = udp_csum_outgoing(sk, skb); | |
746 | ||
747 | /* add protocol-dependent pseudo-header */ | |
748 | uh->check = csum_tcpudp_magic(fl->fl4_src, fl->fl4_dst, up->len, | |
c482c568 | 749 | sk->sk_protocol, csum); |
db8dac20 DM |
750 | if (uh->check == 0) |
751 | uh->check = CSUM_MANGLED_0; | |
752 | ||
753 | send: | |
754 | err = ip_push_pending_frames(sk); | |
6ce9e7b5 ED |
755 | if (err) { |
756 | if (err == -ENOBUFS && !inet->recverr) { | |
757 | UDP_INC_STATS_USER(sock_net(sk), | |
758 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
759 | err = 0; | |
760 | } | |
761 | } else | |
762 | UDP_INC_STATS_USER(sock_net(sk), | |
763 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
db8dac20 DM |
764 | out: |
765 | up->len = 0; | |
766 | up->pending = 0; | |
db8dac20 DM |
767 | return err; |
768 | } | |
769 | ||
770 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
771 | size_t len) | |
772 | { | |
773 | struct inet_sock *inet = inet_sk(sk); | |
774 | struct udp_sock *up = udp_sk(sk); | |
775 | int ulen = len; | |
776 | struct ipcm_cookie ipc; | |
777 | struct rtable *rt = NULL; | |
778 | int free = 0; | |
779 | int connected = 0; | |
780 | __be32 daddr, faddr, saddr; | |
781 | __be16 dport; | |
782 | u8 tos; | |
783 | int err, is_udplite = IS_UDPLITE(sk); | |
784 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
785 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
786 | ||
787 | if (len > 0xFFFF) | |
788 | return -EMSGSIZE; | |
789 | ||
790 | /* | |
791 | * Check the flags. | |
792 | */ | |
793 | ||
c482c568 | 794 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
795 | return -EOPNOTSUPP; |
796 | ||
797 | ipc.opt = NULL; | |
51f31cab | 798 | ipc.shtx.flags = 0; |
db8dac20 DM |
799 | |
800 | if (up->pending) { | |
801 | /* | |
802 | * There are pending frames. | |
803 | * The socket lock must be held while it's corked. | |
804 | */ | |
805 | lock_sock(sk); | |
806 | if (likely(up->pending)) { | |
807 | if (unlikely(up->pending != AF_INET)) { | |
808 | release_sock(sk); | |
809 | return -EINVAL; | |
810 | } | |
811 | goto do_append_data; | |
812 | } | |
813 | release_sock(sk); | |
814 | } | |
815 | ulen += sizeof(struct udphdr); | |
816 | ||
817 | /* | |
818 | * Get and verify the address. | |
819 | */ | |
820 | if (msg->msg_name) { | |
c482c568 | 821 | struct sockaddr_in * usin = (struct sockaddr_in *)msg->msg_name; |
db8dac20 DM |
822 | if (msg->msg_namelen < sizeof(*usin)) |
823 | return -EINVAL; | |
824 | if (usin->sin_family != AF_INET) { | |
825 | if (usin->sin_family != AF_UNSPEC) | |
826 | return -EAFNOSUPPORT; | |
827 | } | |
828 | ||
829 | daddr = usin->sin_addr.s_addr; | |
830 | dport = usin->sin_port; | |
831 | if (dport == 0) | |
832 | return -EINVAL; | |
833 | } else { | |
834 | if (sk->sk_state != TCP_ESTABLISHED) | |
835 | return -EDESTADDRREQ; | |
c720c7e8 ED |
836 | daddr = inet->inet_daddr; |
837 | dport = inet->inet_dport; | |
db8dac20 DM |
838 | /* Open fast path for connected socket. |
839 | Route will not be used, if at least one option is set. | |
840 | */ | |
841 | connected = 1; | |
842 | } | |
c720c7e8 | 843 | ipc.addr = inet->inet_saddr; |
db8dac20 DM |
844 | |
845 | ipc.oif = sk->sk_bound_dev_if; | |
51f31cab PO |
846 | err = sock_tx_timestamp(msg, sk, &ipc.shtx); |
847 | if (err) | |
848 | return err; | |
db8dac20 | 849 | if (msg->msg_controllen) { |
3b1e0a65 | 850 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
db8dac20 DM |
851 | if (err) |
852 | return err; | |
853 | if (ipc.opt) | |
854 | free = 1; | |
855 | connected = 0; | |
856 | } | |
857 | if (!ipc.opt) | |
858 | ipc.opt = inet->opt; | |
859 | ||
860 | saddr = ipc.addr; | |
861 | ipc.addr = faddr = daddr; | |
862 | ||
863 | if (ipc.opt && ipc.opt->srr) { | |
864 | if (!daddr) | |
865 | return -EINVAL; | |
866 | faddr = ipc.opt->faddr; | |
867 | connected = 0; | |
868 | } | |
869 | tos = RT_TOS(inet->tos); | |
870 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
871 | (msg->msg_flags & MSG_DONTROUTE) || | |
872 | (ipc.opt && ipc.opt->is_strictroute)) { | |
873 | tos |= RTO_ONLINK; | |
874 | connected = 0; | |
875 | } | |
876 | ||
877 | if (ipv4_is_multicast(daddr)) { | |
878 | if (!ipc.oif) | |
879 | ipc.oif = inet->mc_index; | |
880 | if (!saddr) | |
881 | saddr = inet->mc_addr; | |
882 | connected = 0; | |
883 | } | |
884 | ||
885 | if (connected) | |
c482c568 | 886 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 DM |
887 | |
888 | if (rt == NULL) { | |
889 | struct flowi fl = { .oif = ipc.oif, | |
914a9ab3 | 890 | .mark = sk->sk_mark, |
db8dac20 DM |
891 | .nl_u = { .ip4_u = |
892 | { .daddr = faddr, | |
893 | .saddr = saddr, | |
894 | .tos = tos } }, | |
895 | .proto = sk->sk_protocol, | |
a134f85c | 896 | .flags = inet_sk_flowi_flags(sk), |
db8dac20 | 897 | .uli_u = { .ports = |
c720c7e8 | 898 | { .sport = inet->inet_sport, |
db8dac20 | 899 | .dport = dport } } }; |
84a3aa00 PE |
900 | struct net *net = sock_net(sk); |
901 | ||
db8dac20 | 902 | security_sk_classify_flow(sk, &fl); |
84a3aa00 | 903 | err = ip_route_output_flow(net, &rt, &fl, sk, 1); |
db8dac20 DM |
904 | if (err) { |
905 | if (err == -ENETUNREACH) | |
7c73a6fa | 906 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
907 | goto out; |
908 | } | |
909 | ||
910 | err = -EACCES; | |
911 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
912 | !sock_flag(sk, SOCK_BROADCAST)) | |
913 | goto out; | |
914 | if (connected) | |
915 | sk_dst_set(sk, dst_clone(&rt->u.dst)); | |
916 | } | |
917 | ||
918 | if (msg->msg_flags&MSG_CONFIRM) | |
919 | goto do_confirm; | |
920 | back_from_confirm: | |
921 | ||
922 | saddr = rt->rt_src; | |
923 | if (!ipc.addr) | |
924 | daddr = ipc.addr = rt->rt_dst; | |
925 | ||
926 | lock_sock(sk); | |
927 | if (unlikely(up->pending)) { | |
928 | /* The socket is already corked while preparing it. */ | |
929 | /* ... which is an evident application bug. --ANK */ | |
930 | release_sock(sk); | |
931 | ||
932 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); | |
933 | err = -EINVAL; | |
934 | goto out; | |
935 | } | |
936 | /* | |
937 | * Now cork the socket to pend data. | |
938 | */ | |
939 | inet->cork.fl.fl4_dst = daddr; | |
940 | inet->cork.fl.fl_ip_dport = dport; | |
941 | inet->cork.fl.fl4_src = saddr; | |
c720c7e8 | 942 | inet->cork.fl.fl_ip_sport = inet->inet_sport; |
db8dac20 DM |
943 | up->pending = AF_INET; |
944 | ||
945 | do_append_data: | |
946 | up->len += ulen; | |
947 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; | |
948 | err = ip_append_data(sk, getfrag, msg->msg_iov, ulen, | |
2e77d89b | 949 | sizeof(struct udphdr), &ipc, &rt, |
db8dac20 DM |
950 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
951 | if (err) | |
952 | udp_flush_pending_frames(sk); | |
953 | else if (!corkreq) | |
954 | err = udp_push_pending_frames(sk); | |
955 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
956 | up->pending = 0; | |
957 | release_sock(sk); | |
958 | ||
959 | out: | |
960 | ip_rt_put(rt); | |
961 | if (free) | |
962 | kfree(ipc.opt); | |
963 | if (!err) | |
964 | return len; | |
965 | /* | |
966 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
967 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
968 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
969 | * things). We could add another new stat but at least for now that | |
970 | * seems like overkill. | |
971 | */ | |
972 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
629ca23c PE |
973 | UDP_INC_STATS_USER(sock_net(sk), |
974 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
975 | } |
976 | return err; | |
977 | ||
978 | do_confirm: | |
979 | dst_confirm(&rt->u.dst); | |
980 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
981 | goto back_from_confirm; | |
982 | err = 0; | |
983 | goto out; | |
984 | } | |
c482c568 | 985 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
986 | |
987 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
988 | size_t size, int flags) | |
989 | { | |
990 | struct udp_sock *up = udp_sk(sk); | |
991 | int ret; | |
992 | ||
993 | if (!up->pending) { | |
994 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
995 | ||
996 | /* Call udp_sendmsg to specify destination address which | |
997 | * sendpage interface can't pass. | |
998 | * This will succeed only when the socket is connected. | |
999 | */ | |
1000 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
1001 | if (ret < 0) | |
1002 | return ret; | |
1003 | } | |
1004 | ||
1005 | lock_sock(sk); | |
1006 | ||
1007 | if (unlikely(!up->pending)) { | |
1008 | release_sock(sk); | |
1009 | ||
1010 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 3\n"); | |
1011 | return -EINVAL; | |
1012 | } | |
1013 | ||
1014 | ret = ip_append_page(sk, page, offset, size, flags); | |
1015 | if (ret == -EOPNOTSUPP) { | |
1016 | release_sock(sk); | |
1017 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1018 | size, flags); | |
1019 | } | |
1020 | if (ret < 0) { | |
1021 | udp_flush_pending_frames(sk); | |
1022 | goto out; | |
1023 | } | |
1024 | ||
1025 | up->len += size; | |
1026 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1027 | ret = udp_push_pending_frames(sk); | |
1028 | if (!ret) | |
1029 | ret = size; | |
1030 | out: | |
1031 | release_sock(sk); | |
1032 | return ret; | |
1033 | } | |
1034 | ||
85584672 ED |
1035 | |
1036 | /** | |
1037 | * first_packet_length - return length of first packet in receive queue | |
1038 | * @sk: socket | |
1039 | * | |
1040 | * Drops all bad checksum frames, until a valid one is found. | |
1041 | * Returns the length of found skb, or 0 if none is found. | |
1042 | */ | |
1043 | static unsigned int first_packet_length(struct sock *sk) | |
1044 | { | |
1045 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
1046 | struct sk_buff *skb; | |
1047 | unsigned int res; | |
1048 | ||
1049 | __skb_queue_head_init(&list_kill); | |
1050 | ||
1051 | spin_lock_bh(&rcvq->lock); | |
1052 | while ((skb = skb_peek(rcvq)) != NULL && | |
1053 | udp_lib_checksum_complete(skb)) { | |
1054 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1055 | IS_UDPLITE(sk)); | |
8edf19c2 | 1056 | atomic_inc(&sk->sk_drops); |
85584672 ED |
1057 | __skb_unlink(skb, rcvq); |
1058 | __skb_queue_tail(&list_kill, skb); | |
1059 | } | |
1060 | res = skb ? skb->len : 0; | |
1061 | spin_unlock_bh(&rcvq->lock); | |
1062 | ||
1063 | if (!skb_queue_empty(&list_kill)) { | |
1064 | lock_sock(sk); | |
1065 | __skb_queue_purge(&list_kill); | |
1066 | sk_mem_reclaim_partial(sk); | |
1067 | release_sock(sk); | |
1068 | } | |
1069 | return res; | |
1070 | } | |
1071 | ||
1da177e4 LT |
1072 | /* |
1073 | * IOCTL requests applicable to the UDP protocol | |
1074 | */ | |
e905a9ed | 1075 | |
1da177e4 LT |
1076 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1077 | { | |
6516c655 SH |
1078 | switch (cmd) { |
1079 | case SIOCOUTQ: | |
1da177e4 | 1080 | { |
31e6d363 ED |
1081 | int amount = sk_wmem_alloc_get(sk); |
1082 | ||
6516c655 SH |
1083 | return put_user(amount, (int __user *)arg); |
1084 | } | |
1da177e4 | 1085 | |
6516c655 SH |
1086 | case SIOCINQ: |
1087 | { | |
85584672 | 1088 | unsigned int amount = first_packet_length(sk); |
6516c655 | 1089 | |
85584672 | 1090 | if (amount) |
6516c655 SH |
1091 | /* |
1092 | * We will only return the amount | |
1093 | * of this packet since that is all | |
1094 | * that will be read. | |
1095 | */ | |
85584672 ED |
1096 | amount -= sizeof(struct udphdr); |
1097 | ||
6516c655 SH |
1098 | return put_user(amount, (int __user *)arg); |
1099 | } | |
1da177e4 | 1100 | |
6516c655 SH |
1101 | default: |
1102 | return -ENOIOCTLCMD; | |
1da177e4 | 1103 | } |
6516c655 SH |
1104 | |
1105 | return 0; | |
1da177e4 | 1106 | } |
c482c568 | 1107 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1108 | |
db8dac20 DM |
1109 | /* |
1110 | * This should be easy, if there is something there we | |
1111 | * return it, otherwise we block. | |
1112 | */ | |
1113 | ||
1114 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
1115 | size_t len, int noblock, int flags, int *addr_len) | |
1116 | { | |
1117 | struct inet_sock *inet = inet_sk(sk); | |
1118 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
1119 | struct sk_buff *skb; | |
81d54ec8 | 1120 | unsigned int ulen; |
db8dac20 DM |
1121 | int peeked; |
1122 | int err; | |
1123 | int is_udplite = IS_UDPLITE(sk); | |
1124 | ||
1125 | /* | |
1126 | * Check any passed addresses | |
1127 | */ | |
1128 | if (addr_len) | |
c482c568 | 1129 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1130 | |
1131 | if (flags & MSG_ERRQUEUE) | |
1132 | return ip_recv_error(sk, msg, len); | |
1133 | ||
1134 | try_again: | |
1135 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), | |
1136 | &peeked, &err); | |
1137 | if (!skb) | |
1138 | goto out; | |
1139 | ||
1140 | ulen = skb->len - sizeof(struct udphdr); | |
81d54ec8 GR |
1141 | if (len > ulen) |
1142 | len = ulen; | |
1143 | else if (len < ulen) | |
db8dac20 DM |
1144 | msg->msg_flags |= MSG_TRUNC; |
1145 | ||
1146 | /* | |
1147 | * If checksum is needed at all, try to do it while copying the | |
1148 | * data. If the data is truncated, or if we only want a partial | |
1149 | * coverage checksum (UDP-Lite), do it before the copy. | |
1150 | */ | |
1151 | ||
81d54ec8 | 1152 | if (len < ulen || UDP_SKB_CB(skb)->partial_cov) { |
db8dac20 DM |
1153 | if (udp_lib_checksum_complete(skb)) |
1154 | goto csum_copy_err; | |
1155 | } | |
1156 | ||
1157 | if (skb_csum_unnecessary(skb)) | |
1158 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), | |
81d54ec8 | 1159 | msg->msg_iov, len); |
db8dac20 | 1160 | else { |
c482c568 ED |
1161 | err = skb_copy_and_csum_datagram_iovec(skb, |
1162 | sizeof(struct udphdr), | |
1163 | msg->msg_iov); | |
db8dac20 DM |
1164 | |
1165 | if (err == -EINVAL) | |
1166 | goto csum_copy_err; | |
1167 | } | |
1168 | ||
1169 | if (err) | |
1170 | goto out_free; | |
1171 | ||
1172 | if (!peeked) | |
629ca23c PE |
1173 | UDP_INC_STATS_USER(sock_net(sk), |
1174 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1175 | |
3b885787 | 1176 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1177 | |
1178 | /* Copy the address. */ | |
c482c568 | 1179 | if (sin) { |
db8dac20 DM |
1180 | sin->sin_family = AF_INET; |
1181 | sin->sin_port = udp_hdr(skb)->source; | |
1182 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1183 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1184 | } | |
1185 | if (inet->cmsg_flags) | |
1186 | ip_cmsg_recv(msg, skb); | |
1187 | ||
81d54ec8 | 1188 | err = len; |
db8dac20 DM |
1189 | if (flags & MSG_TRUNC) |
1190 | err = ulen; | |
1191 | ||
1192 | out_free: | |
9d410c79 | 1193 | skb_free_datagram_locked(sk, skb); |
db8dac20 DM |
1194 | out: |
1195 | return err; | |
1196 | ||
1197 | csum_copy_err: | |
1198 | lock_sock(sk); | |
1199 | if (!skb_kill_datagram(sk, skb, flags)) | |
629ca23c | 1200 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
db8dac20 DM |
1201 | release_sock(sk); |
1202 | ||
1203 | if (noblock) | |
1204 | return -EAGAIN; | |
1205 | goto try_again; | |
1206 | } | |
1207 | ||
1208 | ||
1da177e4 LT |
1209 | int udp_disconnect(struct sock *sk, int flags) |
1210 | { | |
1211 | struct inet_sock *inet = inet_sk(sk); | |
1212 | /* | |
1213 | * 1003.1g - break association. | |
1214 | */ | |
e905a9ed | 1215 | |
1da177e4 | 1216 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1217 | inet->inet_daddr = 0; |
1218 | inet->inet_dport = 0; | |
1da177e4 LT |
1219 | sk->sk_bound_dev_if = 0; |
1220 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1221 | inet_reset_saddr(sk); | |
1222 | ||
1223 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1224 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1225 | inet->inet_sport = 0; |
1da177e4 LT |
1226 | } |
1227 | sk_dst_reset(sk); | |
1228 | return 0; | |
1229 | } | |
c482c568 | 1230 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1231 | |
645ca708 ED |
1232 | void udp_lib_unhash(struct sock *sk) |
1233 | { | |
723b4610 ED |
1234 | if (sk_hashed(sk)) { |
1235 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1236 | struct udp_hslot *hslot, *hslot2; |
1237 | ||
1238 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1239 | udp_sk(sk)->udp_port_hash); | |
1240 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1241 | |
723b4610 ED |
1242 | spin_lock_bh(&hslot->lock); |
1243 | if (sk_nulls_del_node_init_rcu(sk)) { | |
fdcc8aa9 | 1244 | hslot->count--; |
c720c7e8 | 1245 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1246 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1247 | |
1248 | spin_lock(&hslot2->lock); | |
1249 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1250 | hslot2->count--; | |
1251 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1252 | } |
1253 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1254 | } |
645ca708 ED |
1255 | } |
1256 | EXPORT_SYMBOL(udp_lib_unhash); | |
1257 | ||
93821778 HX |
1258 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1259 | { | |
766e9037 ED |
1260 | int rc = sock_queue_rcv_skb(sk, skb); |
1261 | ||
1262 | if (rc < 0) { | |
1263 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1264 | |
93821778 | 1265 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1266 | if (rc == -ENOMEM) |
93821778 HX |
1267 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1268 | is_udplite); | |
766e9037 ED |
1269 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
1270 | kfree_skb(skb); | |
1271 | return -1; | |
93821778 HX |
1272 | } |
1273 | ||
1274 | return 0; | |
1275 | ||
93821778 HX |
1276 | } |
1277 | ||
db8dac20 DM |
1278 | /* returns: |
1279 | * -1: error | |
1280 | * 0: success | |
1281 | * >0: "udp encap" protocol resubmission | |
1282 | * | |
1283 | * Note that in the success and error cases, the skb is assumed to | |
1284 | * have either been requeued or freed. | |
1285 | */ | |
c482c568 | 1286 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1287 | { |
1288 | struct udp_sock *up = udp_sk(sk); | |
1289 | int rc; | |
1290 | int is_udplite = IS_UDPLITE(sk); | |
1291 | ||
1292 | /* | |
1293 | * Charge it to the socket, dropping if the queue is full. | |
1294 | */ | |
1295 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1296 | goto drop; | |
1297 | nf_reset(skb); | |
1298 | ||
1299 | if (up->encap_type) { | |
1300 | /* | |
1301 | * This is an encapsulation socket so pass the skb to | |
1302 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1303 | * fall through and pass this up the UDP socket. | |
1304 | * up->encap_rcv() returns the following value: | |
1305 | * =0 if skb was successfully passed to the encap | |
1306 | * handler or was discarded by it. | |
1307 | * >0 if skb should be passed on to UDP. | |
1308 | * <0 if skb should be resubmitted as proto -N | |
1309 | */ | |
1310 | ||
1311 | /* if we're overly short, let UDP handle it */ | |
1312 | if (skb->len > sizeof(struct udphdr) && | |
1313 | up->encap_rcv != NULL) { | |
1314 | int ret; | |
1315 | ||
1316 | ret = (*up->encap_rcv)(sk, skb); | |
1317 | if (ret <= 0) { | |
0283328e PE |
1318 | UDP_INC_STATS_BH(sock_net(sk), |
1319 | UDP_MIB_INDATAGRAMS, | |
db8dac20 DM |
1320 | is_udplite); |
1321 | return -ret; | |
1322 | } | |
1323 | } | |
1324 | ||
1325 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1326 | } | |
1327 | ||
1328 | /* | |
1329 | * UDP-Lite specific tests, ignored on UDP sockets | |
1330 | */ | |
1331 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1332 | ||
1333 | /* | |
1334 | * MIB statistics other than incrementing the error count are | |
1335 | * disabled for the following two types of errors: these depend | |
1336 | * on the application settings, not on the functioning of the | |
1337 | * protocol stack as such. | |
1338 | * | |
1339 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1340 | * way ... to ... at least let the receiving application block | |
1341 | * delivery of packets with coverage values less than a value | |
1342 | * provided by the application." | |
1343 | */ | |
1344 | if (up->pcrlen == 0) { /* full coverage was set */ | |
1345 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE: partial coverage " | |
1346 | "%d while full coverage %d requested\n", | |
1347 | UDP_SKB_CB(skb)->cscov, skb->len); | |
1348 | goto drop; | |
1349 | } | |
1350 | /* The next case involves violating the min. coverage requested | |
1351 | * by the receiver. This is subtle: if receiver wants x and x is | |
1352 | * greater than the buffersize/MTU then receiver will complain | |
1353 | * that it wants x while sender emits packets of smaller size y. | |
1354 | * Therefore the above ...()->partial_cov statement is essential. | |
1355 | */ | |
1356 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
1357 | LIMIT_NETDEBUG(KERN_WARNING | |
1358 | "UDPLITE: coverage %d too small, need min %d\n", | |
1359 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
1360 | goto drop; | |
1361 | } | |
1362 | } | |
1363 | ||
1364 | if (sk->sk_filter) { | |
1365 | if (udp_lib_checksum_complete(skb)) | |
1366 | goto drop; | |
1367 | } | |
1368 | ||
93821778 | 1369 | rc = 0; |
db8dac20 | 1370 | |
93821778 HX |
1371 | bh_lock_sock(sk); |
1372 | if (!sock_owned_by_user(sk)) | |
1373 | rc = __udp_queue_rcv_skb(sk, skb); | |
a3a858ff | 1374 | else if (sk_add_backlog(sk, skb)) { |
55349790 ZY |
1375 | bh_unlock_sock(sk); |
1376 | goto drop; | |
1377 | } | |
93821778 HX |
1378 | bh_unlock_sock(sk); |
1379 | ||
1380 | return rc; | |
db8dac20 DM |
1381 | |
1382 | drop: | |
0283328e | 1383 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1384 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1385 | kfree_skb(skb); |
1386 | return -1; | |
1387 | } | |
1388 | ||
1240d137 ED |
1389 | |
1390 | static void flush_stack(struct sock **stack, unsigned int count, | |
1391 | struct sk_buff *skb, unsigned int final) | |
1392 | { | |
1393 | unsigned int i; | |
1394 | struct sk_buff *skb1 = NULL; | |
f6b8f32c | 1395 | struct sock *sk; |
1240d137 ED |
1396 | |
1397 | for (i = 0; i < count; i++) { | |
f6b8f32c | 1398 | sk = stack[i]; |
1240d137 ED |
1399 | if (likely(skb1 == NULL)) |
1400 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
1401 | ||
f6b8f32c ED |
1402 | if (!skb1) { |
1403 | atomic_inc(&sk->sk_drops); | |
1404 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
1405 | IS_UDPLITE(sk)); | |
1406 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1407 | IS_UDPLITE(sk)); | |
1408 | } | |
1409 | ||
1410 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) | |
1240d137 ED |
1411 | skb1 = NULL; |
1412 | } | |
1413 | if (unlikely(skb1)) | |
1414 | kfree_skb(skb1); | |
1415 | } | |
1416 | ||
db8dac20 DM |
1417 | /* |
1418 | * Multicasts and broadcasts go to each listener. | |
1419 | * | |
1240d137 | 1420 | * Note: called only from the BH handler context. |
db8dac20 | 1421 | */ |
e3163493 | 1422 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1423 | struct udphdr *uh, |
1424 | __be32 saddr, __be32 daddr, | |
645ca708 | 1425 | struct udp_table *udptable) |
db8dac20 | 1426 | { |
1240d137 | 1427 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
f86dcc5a | 1428 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
db8dac20 | 1429 | int dif; |
1240d137 | 1430 | unsigned int i, count = 0; |
db8dac20 | 1431 | |
645ca708 | 1432 | spin_lock(&hslot->lock); |
88ab1932 | 1433 | sk = sk_nulls_head(&hslot->head); |
db8dac20 | 1434 | dif = skb->dev->ifindex; |
920a4611 | 1435 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1240d137 ED |
1436 | while (sk) { |
1437 | stack[count++] = sk; | |
1438 | sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, | |
1439 | daddr, uh->source, saddr, dif); | |
1440 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
1441 | if (!sk) | |
1442 | break; | |
1443 | flush_stack(stack, count, skb, ~0); | |
1444 | count = 0; | |
1445 | } | |
1446 | } | |
1447 | /* | |
1448 | * before releasing chain lock, we must take a reference on sockets | |
1449 | */ | |
1450 | for (i = 0; i < count; i++) | |
1451 | sock_hold(stack[i]); | |
1452 | ||
645ca708 | 1453 | spin_unlock(&hslot->lock); |
1240d137 ED |
1454 | |
1455 | /* | |
1456 | * do the slow work with no lock held | |
1457 | */ | |
1458 | if (count) { | |
1459 | flush_stack(stack, count, skb, count - 1); | |
1460 | ||
1461 | for (i = 0; i < count; i++) | |
1462 | sock_put(stack[i]); | |
1463 | } else { | |
1464 | kfree_skb(skb); | |
1465 | } | |
db8dac20 DM |
1466 | return 0; |
1467 | } | |
1468 | ||
1469 | /* Initialize UDP checksum. If exited with zero value (success), | |
1470 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1471 | * Otherwise, csum completion requires chacksumming packet body, | |
1472 | * including udp header and folding it to skb->csum. | |
1473 | */ | |
1474 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1475 | int proto) | |
1476 | { | |
1477 | const struct iphdr *iph; | |
1478 | int err; | |
1479 | ||
1480 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1481 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1482 | ||
1483 | if (proto == IPPROTO_UDPLITE) { | |
1484 | err = udplite_checksum_init(skb, uh); | |
1485 | if (err) | |
1486 | return err; | |
1487 | } | |
1488 | ||
1489 | iph = ip_hdr(skb); | |
1490 | if (uh->check == 0) { | |
1491 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1492 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
c482c568 | 1493 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
db8dac20 DM |
1494 | proto, skb->csum)) |
1495 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1496 | } | |
1497 | if (!skb_csum_unnecessary(skb)) | |
1498 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
1499 | skb->len, proto, 0); | |
1500 | /* Probably, we should checksum udp header (it should be in cache | |
1501 | * in any case) and data in tiny packets (< rx copybreak). | |
1502 | */ | |
1503 | ||
1504 | return 0; | |
1505 | } | |
1506 | ||
1507 | /* | |
1508 | * All we need to do is get the socket, and then do a checksum. | |
1509 | */ | |
1510 | ||
645ca708 | 1511 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1512 | int proto) |
1513 | { | |
1514 | struct sock *sk; | |
7b5e56f9 | 1515 | struct udphdr *uh; |
db8dac20 | 1516 | unsigned short ulen; |
adf30907 | 1517 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1518 | __be32 saddr, daddr; |
0283328e | 1519 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1520 | |
1521 | /* | |
1522 | * Validate the packet. | |
1523 | */ | |
1524 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1525 | goto drop; /* No space for header. */ | |
1526 | ||
7b5e56f9 | 1527 | uh = udp_hdr(skb); |
db8dac20 DM |
1528 | ulen = ntohs(uh->len); |
1529 | if (ulen > skb->len) | |
1530 | goto short_packet; | |
1531 | ||
1532 | if (proto == IPPROTO_UDP) { | |
1533 | /* UDP validates ulen. */ | |
1534 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1535 | goto short_packet; | |
1536 | uh = udp_hdr(skb); | |
1537 | } | |
1538 | ||
1539 | if (udp4_csum_init(skb, uh, proto)) | |
1540 | goto csum_error; | |
1541 | ||
2783ef23 JDB |
1542 | saddr = ip_hdr(skb)->saddr; |
1543 | daddr = ip_hdr(skb)->daddr; | |
1544 | ||
db8dac20 | 1545 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) |
e3163493 PE |
1546 | return __udp4_lib_mcast_deliver(net, skb, uh, |
1547 | saddr, daddr, udptable); | |
db8dac20 | 1548 | |
607c4aaf | 1549 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
db8dac20 DM |
1550 | |
1551 | if (sk != NULL) { | |
93821778 | 1552 | int ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1553 | sock_put(sk); |
1554 | ||
1555 | /* a return value > 0 means to resubmit the input, but | |
1556 | * it wants the return to be -protocol, or 0 | |
1557 | */ | |
1558 | if (ret > 0) | |
1559 | return -ret; | |
1560 | return 0; | |
1561 | } | |
1562 | ||
1563 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1564 | goto drop; | |
1565 | nf_reset(skb); | |
1566 | ||
1567 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1568 | if (udp_lib_checksum_complete(skb)) | |
1569 | goto csum_error; | |
1570 | ||
0283328e | 1571 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1572 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1573 | ||
1574 | /* | |
1575 | * Hmm. We got an UDP packet to a port to which we | |
1576 | * don't wanna listen. Ignore it. | |
1577 | */ | |
1578 | kfree_skb(skb); | |
1579 | return 0; | |
1580 | ||
1581 | short_packet: | |
673d57e7 | 1582 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
db8dac20 | 1583 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
673d57e7 | 1584 | &saddr, |
db8dac20 DM |
1585 | ntohs(uh->source), |
1586 | ulen, | |
1587 | skb->len, | |
673d57e7 | 1588 | &daddr, |
db8dac20 DM |
1589 | ntohs(uh->dest)); |
1590 | goto drop; | |
1591 | ||
1592 | csum_error: | |
1593 | /* | |
1594 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1595 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1596 | */ | |
673d57e7 | 1597 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
db8dac20 | 1598 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
673d57e7 | 1599 | &saddr, |
db8dac20 | 1600 | ntohs(uh->source), |
673d57e7 | 1601 | &daddr, |
db8dac20 DM |
1602 | ntohs(uh->dest), |
1603 | ulen); | |
1604 | drop: | |
0283328e | 1605 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1606 | kfree_skb(skb); |
1607 | return 0; | |
1608 | } | |
1609 | ||
1610 | int udp_rcv(struct sk_buff *skb) | |
1611 | { | |
645ca708 | 1612 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1613 | } |
1614 | ||
7d06b2e0 | 1615 | void udp_destroy_sock(struct sock *sk) |
db8dac20 DM |
1616 | { |
1617 | lock_sock(sk); | |
1618 | udp_flush_pending_frames(sk); | |
1619 | release_sock(sk); | |
db8dac20 DM |
1620 | } |
1621 | ||
1da177e4 LT |
1622 | /* |
1623 | * Socket option code for UDP | |
1624 | */ | |
4c0a6cb0 | 1625 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1626 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1627 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1628 | { |
1629 | struct udp_sock *up = udp_sk(sk); | |
1630 | int val; | |
1631 | int err = 0; | |
b2bf1e26 | 1632 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1633 | |
c482c568 | 1634 | if (optlen < sizeof(int)) |
1da177e4 LT |
1635 | return -EINVAL; |
1636 | ||
1637 | if (get_user(val, (int __user *)optval)) | |
1638 | return -EFAULT; | |
1639 | ||
6516c655 | 1640 | switch (optname) { |
1da177e4 LT |
1641 | case UDP_CORK: |
1642 | if (val != 0) { | |
1643 | up->corkflag = 1; | |
1644 | } else { | |
1645 | up->corkflag = 0; | |
1646 | lock_sock(sk); | |
4c0a6cb0 | 1647 | (*push_pending_frames)(sk); |
1da177e4 LT |
1648 | release_sock(sk); |
1649 | } | |
1650 | break; | |
e905a9ed | 1651 | |
1da177e4 LT |
1652 | case UDP_ENCAP: |
1653 | switch (val) { | |
1654 | case 0: | |
1655 | case UDP_ENCAP_ESPINUDP: | |
1656 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1657 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1658 | /* FALLTHROUGH */ | |
342f0234 | 1659 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 LT |
1660 | up->encap_type = val; |
1661 | break; | |
1662 | default: | |
1663 | err = -ENOPROTOOPT; | |
1664 | break; | |
1665 | } | |
1666 | break; | |
1667 | ||
ba4e58ec GR |
1668 | /* |
1669 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1670 | */ | |
1671 | /* The sender sets actual checksum coverage length via this option. | |
1672 | * The case coverage > packet length is handled by send module. */ | |
1673 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 1674 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1675 | return -ENOPROTOOPT; |
1676 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1677 | val = 8; | |
47112e25 GR |
1678 | else if (val > USHORT_MAX) |
1679 | val = USHORT_MAX; | |
ba4e58ec GR |
1680 | up->pcslen = val; |
1681 | up->pcflag |= UDPLITE_SEND_CC; | |
1682 | break; | |
1683 | ||
e905a9ed YH |
1684 | /* The receiver specifies a minimum checksum coverage value. To make |
1685 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1686 | * used, this again means full checksum coverage. */ |
1687 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 1688 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1689 | return -ENOPROTOOPT; |
1690 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1691 | val = 8; | |
47112e25 GR |
1692 | else if (val > USHORT_MAX) |
1693 | val = USHORT_MAX; | |
ba4e58ec GR |
1694 | up->pcrlen = val; |
1695 | up->pcflag |= UDPLITE_RECV_CC; | |
1696 | break; | |
1697 | ||
1da177e4 LT |
1698 | default: |
1699 | err = -ENOPROTOOPT; | |
1700 | break; | |
6516c655 | 1701 | } |
1da177e4 LT |
1702 | |
1703 | return err; | |
1704 | } | |
c482c568 | 1705 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 1706 | |
db8dac20 | 1707 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1708 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1709 | { |
1710 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1711 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1712 | udp_push_pending_frames); | |
1713 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
1714 | } | |
1715 | ||
1716 | #ifdef CONFIG_COMPAT | |
1717 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1718 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1719 | { |
1720 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1721 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1722 | udp_push_pending_frames); | |
1723 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
1724 | } | |
1725 | #endif | |
1726 | ||
4c0a6cb0 GR |
1727 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1728 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1729 | { |
1730 | struct udp_sock *up = udp_sk(sk); | |
1731 | int val, len; | |
1732 | ||
c482c568 | 1733 | if (get_user(len, optlen)) |
1da177e4 LT |
1734 | return -EFAULT; |
1735 | ||
1736 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1737 | |
6516c655 | 1738 | if (len < 0) |
1da177e4 LT |
1739 | return -EINVAL; |
1740 | ||
6516c655 | 1741 | switch (optname) { |
1da177e4 LT |
1742 | case UDP_CORK: |
1743 | val = up->corkflag; | |
1744 | break; | |
1745 | ||
1746 | case UDP_ENCAP: | |
1747 | val = up->encap_type; | |
1748 | break; | |
1749 | ||
ba4e58ec GR |
1750 | /* The following two cannot be changed on UDP sockets, the return is |
1751 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1752 | case UDPLITE_SEND_CSCOV: | |
1753 | val = up->pcslen; | |
1754 | break; | |
1755 | ||
1756 | case UDPLITE_RECV_CSCOV: | |
1757 | val = up->pcrlen; | |
1758 | break; | |
1759 | ||
1da177e4 LT |
1760 | default: |
1761 | return -ENOPROTOOPT; | |
6516c655 | 1762 | } |
1da177e4 | 1763 | |
6516c655 | 1764 | if (put_user(len, optlen)) |
e905a9ed | 1765 | return -EFAULT; |
c482c568 | 1766 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 1767 | return -EFAULT; |
e905a9ed | 1768 | return 0; |
1da177e4 | 1769 | } |
c482c568 | 1770 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 1771 | |
db8dac20 DM |
1772 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1773 | char __user *optval, int __user *optlen) | |
1774 | { | |
1775 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1776 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1777 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
1778 | } | |
1779 | ||
1780 | #ifdef CONFIG_COMPAT | |
1781 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
1782 | char __user *optval, int __user *optlen) | |
1783 | { | |
1784 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1785 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1786 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
1787 | } | |
1788 | #endif | |
1da177e4 LT |
1789 | /** |
1790 | * udp_poll - wait for a UDP event. | |
1791 | * @file - file struct | |
1792 | * @sock - socket | |
1793 | * @wait - poll table | |
1794 | * | |
e905a9ed | 1795 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1796 | * blocking sockets. If application is using a blocking fd |
1797 | * and a packet with checksum error is in the queue; | |
1798 | * then it could get return from select indicating data available | |
1799 | * but then block when reading it. Add special case code | |
1800 | * to work around these arguably broken applications. | |
1801 | */ | |
1802 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
1803 | { | |
1804 | unsigned int mask = datagram_poll(file, sock, wait); | |
1805 | struct sock *sk = sock->sk; | |
ba4e58ec | 1806 | |
1da177e4 | 1807 | /* Check for false positives due to checksum errors */ |
85584672 ED |
1808 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
1809 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
1810 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
1811 | |
1812 | return mask; | |
e905a9ed | 1813 | |
1da177e4 | 1814 | } |
c482c568 | 1815 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 1816 | |
db8dac20 DM |
1817 | struct proto udp_prot = { |
1818 | .name = "UDP", | |
1819 | .owner = THIS_MODULE, | |
1820 | .close = udp_lib_close, | |
1821 | .connect = ip4_datagram_connect, | |
1822 | .disconnect = udp_disconnect, | |
1823 | .ioctl = udp_ioctl, | |
1824 | .destroy = udp_destroy_sock, | |
1825 | .setsockopt = udp_setsockopt, | |
1826 | .getsockopt = udp_getsockopt, | |
1827 | .sendmsg = udp_sendmsg, | |
1828 | .recvmsg = udp_recvmsg, | |
1829 | .sendpage = udp_sendpage, | |
93821778 | 1830 | .backlog_rcv = __udp_queue_rcv_skb, |
db8dac20 DM |
1831 | .hash = udp_lib_hash, |
1832 | .unhash = udp_lib_unhash, | |
1833 | .get_port = udp_v4_get_port, | |
1834 | .memory_allocated = &udp_memory_allocated, | |
1835 | .sysctl_mem = sysctl_udp_mem, | |
1836 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1837 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
1838 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 1839 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1840 | .h.udp_table = &udp_table, |
db8dac20 DM |
1841 | #ifdef CONFIG_COMPAT |
1842 | .compat_setsockopt = compat_udp_setsockopt, | |
1843 | .compat_getsockopt = compat_udp_getsockopt, | |
1844 | #endif | |
db8dac20 | 1845 | }; |
c482c568 | 1846 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
1847 | |
1848 | /* ------------------------------------------------------------------------ */ | |
1849 | #ifdef CONFIG_PROC_FS | |
1850 | ||
645ca708 | 1851 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
1852 | { |
1853 | struct sock *sk; | |
1854 | struct udp_iter_state *state = seq->private; | |
6f191efe | 1855 | struct net *net = seq_file_net(seq); |
1da177e4 | 1856 | |
f86dcc5a ED |
1857 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
1858 | ++state->bucket) { | |
88ab1932 | 1859 | struct hlist_nulls_node *node; |
645ca708 | 1860 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a ED |
1861 | |
1862 | if (hlist_nulls_empty(&hslot->head)) | |
1863 | continue; | |
1864 | ||
645ca708 | 1865 | spin_lock_bh(&hslot->lock); |
88ab1932 | 1866 | sk_nulls_for_each(sk, node, &hslot->head) { |
878628fb | 1867 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 1868 | continue; |
1da177e4 LT |
1869 | if (sk->sk_family == state->family) |
1870 | goto found; | |
1871 | } | |
645ca708 | 1872 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
1873 | } |
1874 | sk = NULL; | |
1875 | found: | |
1876 | return sk; | |
1877 | } | |
1878 | ||
1879 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
1880 | { | |
1881 | struct udp_iter_state *state = seq->private; | |
6f191efe | 1882 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
1883 | |
1884 | do { | |
88ab1932 | 1885 | sk = sk_nulls_next(sk); |
878628fb | 1886 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 1887 | |
645ca708 | 1888 | if (!sk) { |
f86dcc5a | 1889 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 1890 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 1891 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
1892 | } |
1893 | return sk; | |
1894 | } | |
1895 | ||
1896 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
1897 | { | |
645ca708 | 1898 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
1899 | |
1900 | if (sk) | |
6516c655 | 1901 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
1902 | --pos; |
1903 | return pos ? NULL : sk; | |
1904 | } | |
1905 | ||
1906 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
1907 | { | |
30842f29 | 1908 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 1909 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 1910 | |
b50660f1 | 1911 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
1912 | } |
1913 | ||
1914 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
1915 | { | |
1916 | struct sock *sk; | |
1917 | ||
b50660f1 | 1918 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
1919 | sk = udp_get_idx(seq, 0); |
1920 | else | |
1921 | sk = udp_get_next(seq, v); | |
1922 | ||
1923 | ++*pos; | |
1924 | return sk; | |
1925 | } | |
1926 | ||
1927 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
1928 | { | |
645ca708 ED |
1929 | struct udp_iter_state *state = seq->private; |
1930 | ||
f86dcc5a | 1931 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 1932 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
1933 | } |
1934 | ||
1935 | static int udp_seq_open(struct inode *inode, struct file *file) | |
1936 | { | |
1937 | struct udp_seq_afinfo *afinfo = PDE(inode)->data; | |
a2be75c1 DL |
1938 | struct udp_iter_state *s; |
1939 | int err; | |
a91275ef | 1940 | |
a2be75c1 DL |
1941 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
1942 | sizeof(struct udp_iter_state)); | |
1943 | if (err < 0) | |
1944 | return err; | |
a91275ef | 1945 | |
a2be75c1 | 1946 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 1947 | s->family = afinfo->family; |
645ca708 | 1948 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 1949 | return err; |
a91275ef DL |
1950 | } |
1951 | ||
1da177e4 | 1952 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 1953 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
1954 | { |
1955 | struct proc_dir_entry *p; | |
1956 | int rc = 0; | |
1957 | ||
3ba9441b DL |
1958 | afinfo->seq_fops.open = udp_seq_open; |
1959 | afinfo->seq_fops.read = seq_read; | |
1960 | afinfo->seq_fops.llseek = seq_lseek; | |
1961 | afinfo->seq_fops.release = seq_release_net; | |
1da177e4 | 1962 | |
dda61925 DL |
1963 | afinfo->seq_ops.start = udp_seq_start; |
1964 | afinfo->seq_ops.next = udp_seq_next; | |
1965 | afinfo->seq_ops.stop = udp_seq_stop; | |
1966 | ||
84841c3c DL |
1967 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
1968 | &afinfo->seq_fops, afinfo); | |
1969 | if (!p) | |
1da177e4 LT |
1970 | rc = -ENOMEM; |
1971 | return rc; | |
1972 | } | |
c482c568 | 1973 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 1974 | |
0c96d8c5 | 1975 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 1976 | { |
0c96d8c5 | 1977 | proc_net_remove(net, afinfo->name); |
1da177e4 | 1978 | } |
c482c568 | 1979 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
1980 | |
1981 | /* ------------------------------------------------------------------------ */ | |
5e659e4c PE |
1982 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
1983 | int bucket, int *len) | |
db8dac20 DM |
1984 | { |
1985 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
1986 | __be32 dest = inet->inet_daddr; |
1987 | __be32 src = inet->inet_rcv_saddr; | |
1988 | __u16 destp = ntohs(inet->inet_dport); | |
1989 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 1990 | |
f86dcc5a | 1991 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
cb61cb9b | 1992 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d%n", |
db8dac20 | 1993 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
1994 | sk_wmem_alloc_get(sp), |
1995 | sk_rmem_alloc_get(sp), | |
db8dac20 | 1996 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
cb61cb9b ED |
1997 | atomic_read(&sp->sk_refcnt), sp, |
1998 | atomic_read(&sp->sk_drops), len); | |
db8dac20 DM |
1999 | } |
2000 | ||
2001 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2002 | { | |
2003 | if (v == SEQ_START_TOKEN) | |
2004 | seq_printf(seq, "%-127s\n", | |
2005 | " sl local_address rem_address st tx_queue " | |
2006 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 2007 | "inode ref pointer drops"); |
db8dac20 | 2008 | else { |
db8dac20 | 2009 | struct udp_iter_state *state = seq->private; |
5e659e4c | 2010 | int len; |
db8dac20 | 2011 | |
5e659e4c | 2012 | udp4_format_sock(v, seq, state->bucket, &len); |
c482c568 | 2013 | seq_printf(seq, "%*s\n", 127 - len, ""); |
db8dac20 DM |
2014 | } |
2015 | return 0; | |
2016 | } | |
2017 | ||
2018 | /* ------------------------------------------------------------------------ */ | |
db8dac20 | 2019 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2020 | .name = "udp", |
2021 | .family = AF_INET, | |
645ca708 | 2022 | .udp_table = &udp_table, |
4ad96d39 DL |
2023 | .seq_fops = { |
2024 | .owner = THIS_MODULE, | |
2025 | }, | |
dda61925 DL |
2026 | .seq_ops = { |
2027 | .show = udp4_seq_show, | |
2028 | }, | |
db8dac20 DM |
2029 | }; |
2030 | ||
2c8c1e72 | 2031 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2032 | { |
2033 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2034 | } | |
2035 | ||
2c8c1e72 | 2036 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2037 | { |
2038 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2039 | } | |
2040 | ||
2041 | static struct pernet_operations udp4_net_ops = { | |
2042 | .init = udp4_proc_init_net, | |
2043 | .exit = udp4_proc_exit_net, | |
2044 | }; | |
2045 | ||
db8dac20 DM |
2046 | int __init udp4_proc_init(void) |
2047 | { | |
15439feb | 2048 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2049 | } |
2050 | ||
2051 | void udp4_proc_exit(void) | |
2052 | { | |
15439feb | 2053 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2054 | } |
1da177e4 LT |
2055 | #endif /* CONFIG_PROC_FS */ |
2056 | ||
f86dcc5a ED |
2057 | static __initdata unsigned long uhash_entries; |
2058 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2059 | { |
f86dcc5a ED |
2060 | if (!str) |
2061 | return 0; | |
2062 | uhash_entries = simple_strtoul(str, &str, 0); | |
2063 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) | |
2064 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2065 | return 1; | |
2066 | } | |
2067 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2068 | |
f86dcc5a ED |
2069 | void __init udp_table_init(struct udp_table *table, const char *name) |
2070 | { | |
2071 | unsigned int i; | |
2072 | ||
2073 | if (!CONFIG_BASE_SMALL) | |
2074 | table->hash = alloc_large_system_hash(name, | |
512615b6 | 2075 | 2 * sizeof(struct udp_hslot), |
f86dcc5a ED |
2076 | uhash_entries, |
2077 | 21, /* one slot per 2 MB */ | |
2078 | 0, | |
2079 | &table->log, | |
2080 | &table->mask, | |
2081 | 64 * 1024); | |
2082 | /* | |
2083 | * Make sure hash table has the minimum size | |
2084 | */ | |
2085 | if (CONFIG_BASE_SMALL || table->mask < UDP_HTABLE_SIZE_MIN - 1) { | |
2086 | table->hash = kmalloc(UDP_HTABLE_SIZE_MIN * | |
512615b6 | 2087 | 2 * sizeof(struct udp_hslot), GFP_KERNEL); |
f86dcc5a ED |
2088 | if (!table->hash) |
2089 | panic(name); | |
2090 | table->log = ilog2(UDP_HTABLE_SIZE_MIN); | |
2091 | table->mask = UDP_HTABLE_SIZE_MIN - 1; | |
2092 | } | |
512615b6 | 2093 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2094 | for (i = 0; i <= table->mask; i++) { |
88ab1932 | 2095 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
fdcc8aa9 | 2096 | table->hash[i].count = 0; |
645ca708 ED |
2097 | spin_lock_init(&table->hash[i].lock); |
2098 | } | |
512615b6 ED |
2099 | for (i = 0; i <= table->mask; i++) { |
2100 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); | |
2101 | table->hash2[i].count = 0; | |
2102 | spin_lock_init(&table->hash2[i].lock); | |
2103 | } | |
645ca708 ED |
2104 | } |
2105 | ||
95766fff HA |
2106 | void __init udp_init(void) |
2107 | { | |
8203efb3 | 2108 | unsigned long nr_pages, limit; |
95766fff | 2109 | |
f86dcc5a | 2110 | udp_table_init(&udp_table, "UDP"); |
95766fff HA |
2111 | /* Set the pressure threshold up by the same strategy of TCP. It is a |
2112 | * fraction of global memory that is up to 1/2 at 256 MB, decreasing | |
2113 | * toward zero with the amount of memory, with a floor of 128 pages. | |
2114 | */ | |
8203efb3 ED |
2115 | nr_pages = totalram_pages - totalhigh_pages; |
2116 | limit = min(nr_pages, 1UL<<(28-PAGE_SHIFT)) >> (20-PAGE_SHIFT); | |
2117 | limit = (limit * (nr_pages >> (20-PAGE_SHIFT))) >> (PAGE_SHIFT-11); | |
95766fff HA |
2118 | limit = max(limit, 128UL); |
2119 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2120 | sysctl_udp_mem[1] = limit; | |
2121 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2122 | ||
2123 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2124 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
2125 | } | |
2126 | ||
d7ca4cc0 SS |
2127 | int udp4_ufo_send_check(struct sk_buff *skb) |
2128 | { | |
2129 | const struct iphdr *iph; | |
2130 | struct udphdr *uh; | |
2131 | ||
2132 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
2133 | return -EINVAL; | |
2134 | ||
2135 | iph = ip_hdr(skb); | |
2136 | uh = udp_hdr(skb); | |
2137 | ||
2138 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, | |
2139 | IPPROTO_UDP, 0); | |
2140 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
2141 | skb->csum_offset = offsetof(struct udphdr, check); | |
2142 | skb->ip_summed = CHECKSUM_PARTIAL; | |
2143 | return 0; | |
2144 | } | |
2145 | ||
2146 | struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, int features) | |
2147 | { | |
2148 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
2149 | unsigned int mss; | |
2150 | int offset; | |
2151 | __wsum csum; | |
2152 | ||
2153 | mss = skb_shinfo(skb)->gso_size; | |
2154 | if (unlikely(skb->len <= mss)) | |
2155 | goto out; | |
2156 | ||
2157 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
2158 | /* Packet is from an untrusted source, reset gso_segs. */ | |
2159 | int type = skb_shinfo(skb)->gso_type; | |
2160 | ||
2161 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
2162 | !(type & (SKB_GSO_UDP)))) | |
2163 | goto out; | |
2164 | ||
2165 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
2166 | ||
2167 | segs = NULL; | |
2168 | goto out; | |
2169 | } | |
2170 | ||
2171 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
2172 | * do checksum of UDP packets sent as multiple IP fragments. | |
2173 | */ | |
2174 | offset = skb->csum_start - skb_headroom(skb); | |
c482c568 | 2175 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
d7ca4cc0 SS |
2176 | offset += skb->csum_offset; |
2177 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
2178 | skb->ip_summed = CHECKSUM_NONE; | |
2179 | ||
2180 | /* Fragment the skb. IP headers of the fragments are updated in | |
2181 | * inet_gso_segment() | |
2182 | */ | |
2183 | segs = skb_segment(skb, features); | |
2184 | out: | |
2185 | return segs; | |
2186 | } | |
2187 |