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 | |
afd46503 JP |
80 | #define pr_fmt(fmt) "UDP: " fmt |
81 | ||
1da177e4 LT |
82 | #include <asm/uaccess.h> |
83 | #include <asm/ioctls.h> | |
95766fff | 84 | #include <linux/bootmem.h> |
8203efb3 ED |
85 | #include <linux/highmem.h> |
86 | #include <linux/swap.h> | |
1da177e4 LT |
87 | #include <linux/types.h> |
88 | #include <linux/fcntl.h> | |
89 | #include <linux/module.h> | |
90 | #include <linux/socket.h> | |
91 | #include <linux/sockios.h> | |
14c85021 | 92 | #include <linux/igmp.h> |
1da177e4 LT |
93 | #include <linux/in.h> |
94 | #include <linux/errno.h> | |
95 | #include <linux/timer.h> | |
96 | #include <linux/mm.h> | |
1da177e4 | 97 | #include <linux/inet.h> |
1da177e4 | 98 | #include <linux/netdevice.h> |
5a0e3ad6 | 99 | #include <linux/slab.h> |
c752f073 | 100 | #include <net/tcp_states.h> |
1da177e4 LT |
101 | #include <linux/skbuff.h> |
102 | #include <linux/proc_fs.h> | |
103 | #include <linux/seq_file.h> | |
457c4cbc | 104 | #include <net/net_namespace.h> |
1da177e4 LT |
105 | #include <net/icmp.h> |
106 | #include <net/route.h> | |
1da177e4 LT |
107 | #include <net/checksum.h> |
108 | #include <net/xfrm.h> | |
296f7ea7 | 109 | #include <trace/events/udp.h> |
447167bf | 110 | #include <linux/static_key.h> |
22911fc5 | 111 | #include <trace/events/skb.h> |
076bb0c8 | 112 | #include <net/busy_poll.h> |
ba4e58ec | 113 | #include "udp_impl.h" |
1da177e4 | 114 | |
f86dcc5a | 115 | struct udp_table udp_table __read_mostly; |
645ca708 | 116 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 117 | |
8d987e5c | 118 | long sysctl_udp_mem[3] __read_mostly; |
95766fff | 119 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
120 | |
121 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 122 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
123 | |
124 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
125 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
126 | ||
8d987e5c | 127 | atomic_long_t udp_memory_allocated; |
95766fff HA |
128 | EXPORT_SYMBOL(udp_memory_allocated); |
129 | ||
f86dcc5a ED |
130 | #define MAX_UDP_PORTS 65536 |
131 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 132 | |
f24d43c0 | 133 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 134 | const struct udp_hslot *hslot, |
98322f22 | 135 | unsigned long *bitmap, |
f24d43c0 ED |
136 | struct sock *sk, |
137 | int (*saddr_comp)(const struct sock *sk1, | |
f86dcc5a ED |
138 | const struct sock *sk2), |
139 | unsigned int log) | |
1da177e4 | 140 | { |
f24d43c0 | 141 | struct sock *sk2; |
88ab1932 | 142 | struct hlist_nulls_node *node; |
ba418fa3 | 143 | kuid_t uid = sock_i_uid(sk); |
25030a7f | 144 | |
88ab1932 | 145 | sk_nulls_for_each(sk2, node, &hslot->head) |
9d4fb27d JP |
146 | if (net_eq(sock_net(sk2), net) && |
147 | sk2 != sk && | |
d4cada4a | 148 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
9d4fb27d JP |
149 | (!sk2->sk_reuse || !sk->sk_reuse) && |
150 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
151 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
ba418fa3 TH |
152 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
153 | !uid_eq(uid, sock_i_uid(sk2))) && | |
98322f22 ED |
154 | (*saddr_comp)(sk, sk2)) { |
155 | if (bitmap) | |
d4cada4a ED |
156 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
157 | bitmap); | |
98322f22 ED |
158 | else |
159 | return 1; | |
160 | } | |
25030a7f GR |
161 | return 0; |
162 | } | |
163 | ||
30fff923 ED |
164 | /* |
165 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
166 | * can insert/delete a socket with local_port == num | |
167 | */ | |
168 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
169 | struct udp_hslot *hslot2, | |
170 | struct sock *sk, | |
171 | int (*saddr_comp)(const struct sock *sk1, | |
172 | const struct sock *sk2)) | |
173 | { | |
174 | struct sock *sk2; | |
175 | struct hlist_nulls_node *node; | |
ba418fa3 | 176 | kuid_t uid = sock_i_uid(sk); |
30fff923 ED |
177 | int res = 0; |
178 | ||
179 | spin_lock(&hslot2->lock); | |
180 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) | |
9d4fb27d JP |
181 | if (net_eq(sock_net(sk2), net) && |
182 | sk2 != sk && | |
183 | (udp_sk(sk2)->udp_port_hash == num) && | |
184 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
185 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
186 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
ba418fa3 TH |
187 | (!sk2->sk_reuseport || !sk->sk_reuseport || |
188 | !uid_eq(uid, sock_i_uid(sk2))) && | |
30fff923 ED |
189 | (*saddr_comp)(sk, sk2)) { |
190 | res = 1; | |
191 | break; | |
192 | } | |
193 | spin_unlock(&hslot2->lock); | |
194 | return res; | |
195 | } | |
196 | ||
25030a7f | 197 | /** |
6ba5a3c5 | 198 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
199 | * |
200 | * @sk: socket struct in question | |
201 | * @snum: port number to look up | |
df2bc459 | 202 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25985edc | 203 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
30fff923 | 204 | * with NULL address |
25030a7f | 205 | */ |
6ba5a3c5 | 206 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 207 | int (*saddr_comp)(const struct sock *sk1, |
30fff923 ED |
208 | const struct sock *sk2), |
209 | unsigned int hash2_nulladdr) | |
25030a7f | 210 | { |
512615b6 | 211 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 212 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 213 | int error = 1; |
3b1e0a65 | 214 | struct net *net = sock_net(sk); |
1da177e4 | 215 | |
32c1da70 | 216 | if (!snum) { |
9088c560 | 217 | int low, high, remaining; |
95c96174 | 218 | unsigned int rand; |
98322f22 ED |
219 | unsigned short first, last; |
220 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 221 | |
227b60f5 | 222 | inet_get_local_port_range(&low, &high); |
a25de534 | 223 | remaining = (high - low) + 1; |
227b60f5 | 224 | |
9088c560 | 225 | rand = net_random(); |
98322f22 ED |
226 | first = (((u64)rand * remaining) >> 32) + low; |
227 | /* | |
228 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
229 | */ | |
f86dcc5a | 230 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
231 | last = first + udptable->mask + 1; |
232 | do { | |
f86dcc5a | 233 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 234 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 235 | spin_lock_bh(&hslot->lock); |
98322f22 | 236 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 237 | saddr_comp, udptable->log); |
98322f22 ED |
238 | |
239 | snum = first; | |
240 | /* | |
241 | * Iterate on all possible values of snum for this hash. | |
242 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
243 | * give us randomization and full range coverage. | |
244 | */ | |
9088c560 | 245 | do { |
98322f22 | 246 | if (low <= snum && snum <= high && |
e3826f1e AW |
247 | !test_bit(snum >> udptable->log, bitmap) && |
248 | !inet_is_reserved_local_port(snum)) | |
98322f22 ED |
249 | goto found; |
250 | snum += rand; | |
251 | } while (snum != first); | |
252 | spin_unlock_bh(&hslot->lock); | |
5781b235 | 253 | } while (++first != last); |
98322f22 | 254 | goto fail; |
645ca708 | 255 | } else { |
f86dcc5a | 256 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 257 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
258 | if (hslot->count > 10) { |
259 | int exist; | |
260 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
261 | ||
262 | slot2 &= udptable->mask; | |
263 | hash2_nulladdr &= udptable->mask; | |
264 | ||
265 | hslot2 = udp_hashslot2(udptable, slot2); | |
266 | if (hslot->count < hslot2->count) | |
267 | goto scan_primary_hash; | |
268 | ||
269 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
270 | sk, saddr_comp); | |
271 | if (!exist && (hash2_nulladdr != slot2)) { | |
272 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
273 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
274 | sk, saddr_comp); | |
275 | } | |
276 | if (exist) | |
277 | goto fail_unlock; | |
278 | else | |
279 | goto found; | |
280 | } | |
281 | scan_primary_hash: | |
f86dcc5a ED |
282 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
283 | saddr_comp, 0)) | |
645ca708 ED |
284 | goto fail_unlock; |
285 | } | |
98322f22 | 286 | found: |
c720c7e8 | 287 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
288 | udp_sk(sk)->udp_port_hash = snum; |
289 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 290 | if (sk_unhashed(sk)) { |
88ab1932 | 291 | sk_nulls_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 292 | hslot->count++; |
c29a0bc4 | 293 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
294 | |
295 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
296 | spin_lock(&hslot2->lock); | |
297 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
298 | &hslot2->head); | |
299 | hslot2->count++; | |
300 | spin_unlock(&hslot2->lock); | |
1da177e4 | 301 | } |
25030a7f | 302 | error = 0; |
645ca708 ED |
303 | fail_unlock: |
304 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 305 | fail: |
25030a7f GR |
306 | return error; |
307 | } | |
c482c568 | 308 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 309 | |
499923c7 | 310 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
db8dac20 DM |
311 | { |
312 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
313 | ||
c482c568 | 314 | return (!ipv6_only_sock(sk2) && |
c720c7e8 ED |
315 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
316 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); | |
db8dac20 DM |
317 | } |
318 | ||
d4cada4a ED |
319 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
320 | unsigned int port) | |
321 | { | |
0eae88f3 | 322 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
d4cada4a ED |
323 | } |
324 | ||
6ba5a3c5 | 325 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 326 | { |
30fff923 | 327 | unsigned int hash2_nulladdr = |
0eae88f3 | 328 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
30fff923 ED |
329 | unsigned int hash2_partial = |
330 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
331 | ||
d4cada4a | 332 | /* precompute partial secondary hash */ |
30fff923 ED |
333 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
334 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); | |
db8dac20 DM |
335 | } |
336 | ||
645ca708 ED |
337 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
338 | unsigned short hnum, | |
339 | __be16 sport, __be32 daddr, __be16 dport, int dif) | |
340 | { | |
341 | int score = -1; | |
342 | ||
d4cada4a | 343 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
344 | !ipv6_only_sock(sk)) { |
345 | struct inet_sock *inet = inet_sk(sk); | |
346 | ||
ba418fa3 | 347 | score = (sk->sk_family == PF_INET ? 2 : 1); |
c720c7e8 ED |
348 | if (inet->inet_rcv_saddr) { |
349 | if (inet->inet_rcv_saddr != daddr) | |
645ca708 | 350 | return -1; |
ba418fa3 | 351 | score += 4; |
645ca708 | 352 | } |
c720c7e8 ED |
353 | if (inet->inet_daddr) { |
354 | if (inet->inet_daddr != saddr) | |
645ca708 | 355 | return -1; |
ba418fa3 | 356 | score += 4; |
645ca708 | 357 | } |
c720c7e8 ED |
358 | if (inet->inet_dport) { |
359 | if (inet->inet_dport != sport) | |
645ca708 | 360 | return -1; |
ba418fa3 | 361 | score += 4; |
645ca708 ED |
362 | } |
363 | if (sk->sk_bound_dev_if) { | |
364 | if (sk->sk_bound_dev_if != dif) | |
365 | return -1; | |
ba418fa3 | 366 | score += 4; |
645ca708 ED |
367 | } |
368 | } | |
369 | return score; | |
370 | } | |
371 | ||
5051ebd2 ED |
372 | /* |
373 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) | |
374 | */ | |
5051ebd2 ED |
375 | static inline int compute_score2(struct sock *sk, struct net *net, |
376 | __be32 saddr, __be16 sport, | |
377 | __be32 daddr, unsigned int hnum, int dif) | |
378 | { | |
379 | int score = -1; | |
380 | ||
381 | if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { | |
382 | struct inet_sock *inet = inet_sk(sk); | |
383 | ||
384 | if (inet->inet_rcv_saddr != daddr) | |
385 | return -1; | |
386 | if (inet->inet_num != hnum) | |
387 | return -1; | |
388 | ||
ba418fa3 | 389 | score = (sk->sk_family == PF_INET ? 2 : 1); |
5051ebd2 ED |
390 | if (inet->inet_daddr) { |
391 | if (inet->inet_daddr != saddr) | |
392 | return -1; | |
ba418fa3 | 393 | score += 4; |
5051ebd2 ED |
394 | } |
395 | if (inet->inet_dport) { | |
396 | if (inet->inet_dport != sport) | |
397 | return -1; | |
ba418fa3 | 398 | score += 4; |
5051ebd2 ED |
399 | } |
400 | if (sk->sk_bound_dev_if) { | |
401 | if (sk->sk_bound_dev_if != dif) | |
402 | return -1; | |
ba418fa3 | 403 | score += 4; |
5051ebd2 ED |
404 | } |
405 | } | |
406 | return score; | |
407 | } | |
408 | ||
5051ebd2 ED |
409 | |
410 | /* called with read_rcu_lock() */ | |
411 | static struct sock *udp4_lib_lookup2(struct net *net, | |
412 | __be32 saddr, __be16 sport, | |
413 | __be32 daddr, unsigned int hnum, int dif, | |
414 | struct udp_hslot *hslot2, unsigned int slot2) | |
415 | { | |
416 | struct sock *sk, *result; | |
417 | struct hlist_nulls_node *node; | |
ba418fa3 TH |
418 | int score, badness, matches = 0, reuseport = 0; |
419 | u32 hash = 0; | |
5051ebd2 ED |
420 | |
421 | begin: | |
422 | result = NULL; | |
ba418fa3 | 423 | badness = 0; |
5051ebd2 ED |
424 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { |
425 | score = compute_score2(sk, net, saddr, sport, | |
426 | daddr, hnum, dif); | |
427 | if (score > badness) { | |
428 | result = sk; | |
429 | badness = score; | |
ba418fa3 TH |
430 | reuseport = sk->sk_reuseport; |
431 | if (reuseport) { | |
432 | hash = inet_ehashfn(net, daddr, hnum, | |
7c0cadc6 | 433 | saddr, sport); |
ba418fa3 TH |
434 | matches = 1; |
435 | } | |
436 | } else if (score == badness && reuseport) { | |
437 | matches++; | |
438 | if (((u64)hash * matches) >> 32 == 0) | |
439 | result = sk; | |
440 | hash = next_pseudo_random32(hash); | |
5051ebd2 ED |
441 | } |
442 | } | |
443 | /* | |
444 | * if the nulls value we got at the end of this lookup is | |
445 | * not the expected one, we must restart lookup. | |
446 | * We probably met an item that was moved to another chain. | |
447 | */ | |
448 | if (get_nulls_value(node) != slot2) | |
449 | goto begin; | |
5051ebd2 | 450 | if (result) { |
c31504dc | 451 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
5051ebd2 ED |
452 | result = NULL; |
453 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
454 | daddr, hnum, dif) < badness)) { | |
455 | sock_put(result); | |
456 | goto begin; | |
457 | } | |
458 | } | |
459 | return result; | |
460 | } | |
461 | ||
db8dac20 DM |
462 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
463 | * harder than this. -DaveM | |
464 | */ | |
fce82338 | 465 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
db8dac20 | 466 | __be16 sport, __be32 daddr, __be16 dport, |
645ca708 | 467 | int dif, struct udp_table *udptable) |
db8dac20 | 468 | { |
271b72c7 | 469 | struct sock *sk, *result; |
88ab1932 | 470 | struct hlist_nulls_node *node; |
db8dac20 | 471 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
472 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
473 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
ba418fa3 TH |
474 | int score, badness, matches = 0, reuseport = 0; |
475 | u32 hash = 0; | |
645ca708 | 476 | |
271b72c7 | 477 | rcu_read_lock(); |
5051ebd2 ED |
478 | if (hslot->count > 10) { |
479 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
480 | slot2 = hash2 & udptable->mask; | |
481 | hslot2 = &udptable->hash2[slot2]; | |
482 | if (hslot->count < hslot2->count) | |
483 | goto begin; | |
484 | ||
485 | result = udp4_lib_lookup2(net, saddr, sport, | |
486 | daddr, hnum, dif, | |
487 | hslot2, slot2); | |
488 | if (!result) { | |
0eae88f3 | 489 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
5051ebd2 ED |
490 | slot2 = hash2 & udptable->mask; |
491 | hslot2 = &udptable->hash2[slot2]; | |
492 | if (hslot->count < hslot2->count) | |
493 | goto begin; | |
494 | ||
1223c67c | 495 | result = udp4_lib_lookup2(net, saddr, sport, |
0eae88f3 | 496 | htonl(INADDR_ANY), hnum, dif, |
5051ebd2 ED |
497 | hslot2, slot2); |
498 | } | |
499 | rcu_read_unlock(); | |
500 | return result; | |
501 | } | |
271b72c7 ED |
502 | begin: |
503 | result = NULL; | |
ba418fa3 | 504 | badness = 0; |
88ab1932 | 505 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
506 | score = compute_score(sk, net, saddr, hnum, sport, |
507 | daddr, dport, dif); | |
508 | if (score > badness) { | |
509 | result = sk; | |
510 | badness = score; | |
ba418fa3 TH |
511 | reuseport = sk->sk_reuseport; |
512 | if (reuseport) { | |
513 | hash = inet_ehashfn(net, daddr, hnum, | |
7c0cadc6 | 514 | saddr, sport); |
ba418fa3 TH |
515 | matches = 1; |
516 | } | |
517 | } else if (score == badness && reuseport) { | |
518 | matches++; | |
519 | if (((u64)hash * matches) >> 32 == 0) | |
520 | result = sk; | |
521 | hash = next_pseudo_random32(hash); | |
db8dac20 DM |
522 | } |
523 | } | |
88ab1932 ED |
524 | /* |
525 | * if the nulls value we got at the end of this lookup is | |
526 | * not the expected one, we must restart lookup. | |
527 | * We probably met an item that was moved to another chain. | |
528 | */ | |
5051ebd2 | 529 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
530 | goto begin; |
531 | ||
271b72c7 | 532 | if (result) { |
c31504dc | 533 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
534 | result = NULL; |
535 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, | |
536 | daddr, dport, dif) < badness)) { | |
537 | sock_put(result); | |
538 | goto begin; | |
539 | } | |
540 | } | |
541 | rcu_read_unlock(); | |
db8dac20 DM |
542 | return result; |
543 | } | |
fce82338 | 544 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
db8dac20 | 545 | |
607c4aaf KK |
546 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
547 | __be16 sport, __be16 dport, | |
645ca708 | 548 | struct udp_table *udptable) |
607c4aaf | 549 | { |
23542618 | 550 | struct sock *sk; |
607c4aaf KK |
551 | const struct iphdr *iph = ip_hdr(skb); |
552 | ||
23542618 KK |
553 | if (unlikely(sk = skb_steal_sock(skb))) |
554 | return sk; | |
555 | else | |
adf30907 | 556 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
23542618 KK |
557 | iph->daddr, dport, inet_iif(skb), |
558 | udptable); | |
607c4aaf KK |
559 | } |
560 | ||
bcd41303 KK |
561 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
562 | __be32 daddr, __be16 dport, int dif) | |
563 | { | |
645ca708 | 564 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
bcd41303 KK |
565 | } |
566 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
567 | ||
920a4611 | 568 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
db8dac20 DM |
569 | __be16 loc_port, __be32 loc_addr, |
570 | __be16 rmt_port, __be32 rmt_addr, | |
571 | int dif) | |
572 | { | |
88ab1932 | 573 | struct hlist_nulls_node *node; |
db8dac20 DM |
574 | struct sock *s = sk; |
575 | unsigned short hnum = ntohs(loc_port); | |
576 | ||
88ab1932 | 577 | sk_nulls_for_each_from(s, node) { |
db8dac20 DM |
578 | struct inet_sock *inet = inet_sk(s); |
579 | ||
9d4fb27d JP |
580 | if (!net_eq(sock_net(s), net) || |
581 | udp_sk(s)->udp_port_hash != hnum || | |
582 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
583 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
584 | (inet->inet_rcv_saddr && | |
585 | inet->inet_rcv_saddr != loc_addr) || | |
586 | ipv6_only_sock(s) || | |
db8dac20 DM |
587 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) |
588 | continue; | |
589 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
590 | continue; | |
591 | goto found; | |
592 | } | |
593 | s = NULL; | |
594 | found: | |
595 | return s; | |
596 | } | |
597 | ||
598 | /* | |
599 | * This routine is called by the ICMP module when it gets some | |
600 | * sort of error condition. If err < 0 then the socket should | |
601 | * be closed and the error returned to the user. If err > 0 | |
602 | * it's just the icmp type << 8 | icmp code. | |
603 | * Header points to the ip header of the error packet. We move | |
604 | * on past this. Then (as it used to claim before adjustment) | |
605 | * header points to the first 8 bytes of the udp header. We need | |
606 | * to find the appropriate port. | |
607 | */ | |
608 | ||
645ca708 | 609 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
610 | { |
611 | struct inet_sock *inet; | |
b71d1d42 | 612 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
c482c568 | 613 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
db8dac20 DM |
614 | const int type = icmp_hdr(skb)->type; |
615 | const int code = icmp_hdr(skb)->code; | |
616 | struct sock *sk; | |
617 | int harderr; | |
618 | int err; | |
fd54d716 | 619 | struct net *net = dev_net(skb->dev); |
db8dac20 | 620 | |
fd54d716 | 621 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
db8dac20 DM |
622 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
623 | if (sk == NULL) { | |
dcfc23ca | 624 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
625 | return; /* No socket for error */ |
626 | } | |
627 | ||
628 | err = 0; | |
629 | harderr = 0; | |
630 | inet = inet_sk(sk); | |
631 | ||
632 | switch (type) { | |
633 | default: | |
634 | case ICMP_TIME_EXCEEDED: | |
635 | err = EHOSTUNREACH; | |
636 | break; | |
637 | case ICMP_SOURCE_QUENCH: | |
638 | goto out; | |
639 | case ICMP_PARAMETERPROB: | |
640 | err = EPROTO; | |
641 | harderr = 1; | |
642 | break; | |
643 | case ICMP_DEST_UNREACH: | |
644 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 645 | ipv4_sk_update_pmtu(skb, sk, info); |
db8dac20 DM |
646 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
647 | err = EMSGSIZE; | |
648 | harderr = 1; | |
649 | break; | |
650 | } | |
651 | goto out; | |
652 | } | |
653 | err = EHOSTUNREACH; | |
654 | if (code <= NR_ICMP_UNREACH) { | |
655 | harderr = icmp_err_convert[code].fatal; | |
656 | err = icmp_err_convert[code].errno; | |
657 | } | |
658 | break; | |
55be7a9c DM |
659 | case ICMP_REDIRECT: |
660 | ipv4_sk_redirect(skb, sk); | |
661 | break; | |
db8dac20 DM |
662 | } |
663 | ||
664 | /* | |
665 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
666 | * 4.1.3.3. | |
667 | */ | |
668 | if (!inet->recverr) { | |
669 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
670 | goto out; | |
b1faf566 | 671 | } else |
c482c568 | 672 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
b1faf566 | 673 | |
db8dac20 DM |
674 | sk->sk_err = err; |
675 | sk->sk_error_report(sk); | |
676 | out: | |
677 | sock_put(sk); | |
678 | } | |
679 | ||
680 | void udp_err(struct sk_buff *skb, u32 info) | |
681 | { | |
645ca708 | 682 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
683 | } |
684 | ||
685 | /* | |
686 | * Throw away all pending data and cancel the corking. Socket is locked. | |
687 | */ | |
36d926b9 | 688 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
689 | { |
690 | struct udp_sock *up = udp_sk(sk); | |
691 | ||
692 | if (up->pending) { | |
693 | up->len = 0; | |
694 | up->pending = 0; | |
695 | ip_flush_pending_frames(sk); | |
696 | } | |
697 | } | |
36d926b9 | 698 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
699 | |
700 | /** | |
f6b9664f | 701 | * udp4_hwcsum - handle outgoing HW checksumming |
db8dac20 DM |
702 | * @skb: sk_buff containing the filled-in UDP header |
703 | * (checksum field must be zeroed out) | |
f6b9664f HX |
704 | * @src: source IP address |
705 | * @dst: destination IP address | |
db8dac20 | 706 | */ |
c26bf4a5 | 707 | void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
db8dac20 | 708 | { |
db8dac20 | 709 | struct udphdr *uh = udp_hdr(skb); |
f6b9664f HX |
710 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
711 | int offset = skb_transport_offset(skb); | |
712 | int len = skb->len - offset; | |
713 | int hlen = len; | |
db8dac20 DM |
714 | __wsum csum = 0; |
715 | ||
f6b9664f | 716 | if (!frags) { |
db8dac20 DM |
717 | /* |
718 | * Only one fragment on the socket. | |
719 | */ | |
720 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
721 | skb->csum_offset = offsetof(struct udphdr, check); | |
f6b9664f HX |
722 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
723 | IPPROTO_UDP, 0); | |
db8dac20 DM |
724 | } else { |
725 | /* | |
726 | * HW-checksum won't work as there are two or more | |
727 | * fragments on the socket so that all csums of sk_buffs | |
728 | * should be together | |
729 | */ | |
f6b9664f HX |
730 | do { |
731 | csum = csum_add(csum, frags->csum); | |
732 | hlen -= frags->len; | |
733 | } while ((frags = frags->next)); | |
db8dac20 | 734 | |
f6b9664f | 735 | csum = skb_checksum(skb, offset, hlen, csum); |
db8dac20 DM |
736 | skb->ip_summed = CHECKSUM_NONE; |
737 | ||
db8dac20 DM |
738 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
739 | if (uh->check == 0) | |
740 | uh->check = CSUM_MANGLED_0; | |
741 | } | |
742 | } | |
c26bf4a5 | 743 | EXPORT_SYMBOL_GPL(udp4_hwcsum); |
db8dac20 | 744 | |
79ab0531 | 745 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
db8dac20 | 746 | { |
f6b9664f | 747 | struct sock *sk = skb->sk; |
db8dac20 | 748 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
749 | struct udphdr *uh; |
750 | int err = 0; | |
751 | int is_udplite = IS_UDPLITE(sk); | |
f6b9664f HX |
752 | int offset = skb_transport_offset(skb); |
753 | int len = skb->len - offset; | |
db8dac20 DM |
754 | __wsum csum = 0; |
755 | ||
db8dac20 DM |
756 | /* |
757 | * Create a UDP header | |
758 | */ | |
759 | uh = udp_hdr(skb); | |
f6b9664f | 760 | uh->source = inet->inet_sport; |
79ab0531 | 761 | uh->dest = fl4->fl4_dport; |
f6b9664f | 762 | uh->len = htons(len); |
db8dac20 DM |
763 | uh->check = 0; |
764 | ||
765 | if (is_udplite) /* UDP-Lite */ | |
f6b9664f | 766 | csum = udplite_csum(skb); |
db8dac20 DM |
767 | |
768 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ | |
769 | ||
770 | skb->ip_summed = CHECKSUM_NONE; | |
771 | goto send; | |
772 | ||
773 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
774 | ||
79ab0531 | 775 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
db8dac20 DM |
776 | goto send; |
777 | ||
f6b9664f HX |
778 | } else |
779 | csum = udp_csum(skb); | |
db8dac20 DM |
780 | |
781 | /* add protocol-dependent pseudo-header */ | |
79ab0531 | 782 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
c482c568 | 783 | sk->sk_protocol, csum); |
db8dac20 DM |
784 | if (uh->check == 0) |
785 | uh->check = CSUM_MANGLED_0; | |
786 | ||
787 | send: | |
b5ec8eea | 788 | err = ip_send_skb(sock_net(sk), skb); |
6ce9e7b5 ED |
789 | if (err) { |
790 | if (err == -ENOBUFS && !inet->recverr) { | |
791 | UDP_INC_STATS_USER(sock_net(sk), | |
792 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
793 | err = 0; | |
794 | } | |
795 | } else | |
796 | UDP_INC_STATS_USER(sock_net(sk), | |
797 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
f6b9664f HX |
798 | return err; |
799 | } | |
800 | ||
801 | /* | |
802 | * Push out all pending data as one UDP datagram. Socket is locked. | |
803 | */ | |
8822b64a | 804 | int udp_push_pending_frames(struct sock *sk) |
f6b9664f HX |
805 | { |
806 | struct udp_sock *up = udp_sk(sk); | |
807 | struct inet_sock *inet = inet_sk(sk); | |
b6f21b26 | 808 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
f6b9664f HX |
809 | struct sk_buff *skb; |
810 | int err = 0; | |
811 | ||
77968b78 | 812 | skb = ip_finish_skb(sk, fl4); |
f6b9664f HX |
813 | if (!skb) |
814 | goto out; | |
815 | ||
79ab0531 | 816 | err = udp_send_skb(skb, fl4); |
f6b9664f | 817 | |
db8dac20 DM |
818 | out: |
819 | up->len = 0; | |
820 | up->pending = 0; | |
db8dac20 DM |
821 | return err; |
822 | } | |
8822b64a | 823 | EXPORT_SYMBOL(udp_push_pending_frames); |
db8dac20 DM |
824 | |
825 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
826 | size_t len) | |
827 | { | |
828 | struct inet_sock *inet = inet_sk(sk); | |
829 | struct udp_sock *up = udp_sk(sk); | |
e474995f | 830 | struct flowi4 fl4_stack; |
b6f21b26 | 831 | struct flowi4 *fl4; |
db8dac20 DM |
832 | int ulen = len; |
833 | struct ipcm_cookie ipc; | |
834 | struct rtable *rt = NULL; | |
835 | int free = 0; | |
836 | int connected = 0; | |
837 | __be32 daddr, faddr, saddr; | |
838 | __be16 dport; | |
839 | u8 tos; | |
840 | int err, is_udplite = IS_UDPLITE(sk); | |
841 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
842 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
903ab86d | 843 | struct sk_buff *skb; |
f6d8bd05 | 844 | struct ip_options_data opt_copy; |
db8dac20 DM |
845 | |
846 | if (len > 0xFFFF) | |
847 | return -EMSGSIZE; | |
848 | ||
849 | /* | |
850 | * Check the flags. | |
851 | */ | |
852 | ||
c482c568 | 853 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
854 | return -EOPNOTSUPP; |
855 | ||
856 | ipc.opt = NULL; | |
2244d07b | 857 | ipc.tx_flags = 0; |
db8dac20 | 858 | |
903ab86d HX |
859 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
860 | ||
f5fca608 | 861 | fl4 = &inet->cork.fl.u.ip4; |
db8dac20 DM |
862 | if (up->pending) { |
863 | /* | |
864 | * There are pending frames. | |
865 | * The socket lock must be held while it's corked. | |
866 | */ | |
867 | lock_sock(sk); | |
868 | if (likely(up->pending)) { | |
869 | if (unlikely(up->pending != AF_INET)) { | |
870 | release_sock(sk); | |
871 | return -EINVAL; | |
872 | } | |
873 | goto do_append_data; | |
874 | } | |
875 | release_sock(sk); | |
876 | } | |
877 | ulen += sizeof(struct udphdr); | |
878 | ||
879 | /* | |
880 | * Get and verify the address. | |
881 | */ | |
882 | if (msg->msg_name) { | |
5e73ea1a | 883 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
db8dac20 DM |
884 | if (msg->msg_namelen < sizeof(*usin)) |
885 | return -EINVAL; | |
886 | if (usin->sin_family != AF_INET) { | |
887 | if (usin->sin_family != AF_UNSPEC) | |
888 | return -EAFNOSUPPORT; | |
889 | } | |
890 | ||
891 | daddr = usin->sin_addr.s_addr; | |
892 | dport = usin->sin_port; | |
893 | if (dport == 0) | |
894 | return -EINVAL; | |
895 | } else { | |
896 | if (sk->sk_state != TCP_ESTABLISHED) | |
897 | return -EDESTADDRREQ; | |
c720c7e8 ED |
898 | daddr = inet->inet_daddr; |
899 | dport = inet->inet_dport; | |
db8dac20 DM |
900 | /* Open fast path for connected socket. |
901 | Route will not be used, if at least one option is set. | |
902 | */ | |
903 | connected = 1; | |
904 | } | |
c720c7e8 | 905 | ipc.addr = inet->inet_saddr; |
db8dac20 DM |
906 | |
907 | ipc.oif = sk->sk_bound_dev_if; | |
bf84a010 DB |
908 | |
909 | sock_tx_timestamp(sk, &ipc.tx_flags); | |
910 | ||
db8dac20 | 911 | if (msg->msg_controllen) { |
3b1e0a65 | 912 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
db8dac20 DM |
913 | if (err) |
914 | return err; | |
915 | if (ipc.opt) | |
916 | free = 1; | |
917 | connected = 0; | |
918 | } | |
f6d8bd05 ED |
919 | if (!ipc.opt) { |
920 | struct ip_options_rcu *inet_opt; | |
921 | ||
922 | rcu_read_lock(); | |
923 | inet_opt = rcu_dereference(inet->inet_opt); | |
924 | if (inet_opt) { | |
925 | memcpy(&opt_copy, inet_opt, | |
926 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
927 | ipc.opt = &opt_copy.opt; | |
928 | } | |
929 | rcu_read_unlock(); | |
930 | } | |
db8dac20 DM |
931 | |
932 | saddr = ipc.addr; | |
933 | ipc.addr = faddr = daddr; | |
934 | ||
f6d8bd05 | 935 | if (ipc.opt && ipc.opt->opt.srr) { |
db8dac20 DM |
936 | if (!daddr) |
937 | return -EINVAL; | |
f6d8bd05 | 938 | faddr = ipc.opt->opt.faddr; |
db8dac20 DM |
939 | connected = 0; |
940 | } | |
941 | tos = RT_TOS(inet->tos); | |
942 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
943 | (msg->msg_flags & MSG_DONTROUTE) || | |
f6d8bd05 | 944 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
db8dac20 DM |
945 | tos |= RTO_ONLINK; |
946 | connected = 0; | |
947 | } | |
948 | ||
949 | if (ipv4_is_multicast(daddr)) { | |
950 | if (!ipc.oif) | |
951 | ipc.oif = inet->mc_index; | |
952 | if (!saddr) | |
953 | saddr = inet->mc_addr; | |
954 | connected = 0; | |
76e21053 EH |
955 | } else if (!ipc.oif) |
956 | ipc.oif = inet->uc_index; | |
db8dac20 DM |
957 | |
958 | if (connected) | |
c482c568 | 959 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 DM |
960 | |
961 | if (rt == NULL) { | |
84a3aa00 PE |
962 | struct net *net = sock_net(sk); |
963 | ||
e474995f DM |
964 | fl4 = &fl4_stack; |
965 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, | |
c0951cbc DM |
966 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
967 | inet_sk_flowi_flags(sk)|FLOWI_FLAG_CAN_SLEEP, | |
968 | faddr, saddr, dport, inet->inet_sport); | |
969 | ||
e474995f DM |
970 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
971 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe DM |
972 | if (IS_ERR(rt)) { |
973 | err = PTR_ERR(rt); | |
06dc94b1 | 974 | rt = NULL; |
db8dac20 | 975 | if (err == -ENETUNREACH) |
7c73a6fa | 976 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
977 | goto out; |
978 | } | |
979 | ||
980 | err = -EACCES; | |
981 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
982 | !sock_flag(sk, SOCK_BROADCAST)) | |
983 | goto out; | |
984 | if (connected) | |
d8d1f30b | 985 | sk_dst_set(sk, dst_clone(&rt->dst)); |
db8dac20 DM |
986 | } |
987 | ||
988 | if (msg->msg_flags&MSG_CONFIRM) | |
989 | goto do_confirm; | |
990 | back_from_confirm: | |
991 | ||
e474995f | 992 | saddr = fl4->saddr; |
db8dac20 | 993 | if (!ipc.addr) |
e474995f | 994 | daddr = ipc.addr = fl4->daddr; |
db8dac20 | 995 | |
903ab86d HX |
996 | /* Lockless fast path for the non-corking case. */ |
997 | if (!corkreq) { | |
77968b78 | 998 | skb = ip_make_skb(sk, fl4, getfrag, msg->msg_iov, ulen, |
903ab86d HX |
999 | sizeof(struct udphdr), &ipc, &rt, |
1000 | msg->msg_flags); | |
1001 | err = PTR_ERR(skb); | |
50c3a487 | 1002 | if (!IS_ERR_OR_NULL(skb)) |
79ab0531 | 1003 | err = udp_send_skb(skb, fl4); |
903ab86d HX |
1004 | goto out; |
1005 | } | |
1006 | ||
db8dac20 DM |
1007 | lock_sock(sk); |
1008 | if (unlikely(up->pending)) { | |
1009 | /* The socket is already corked while preparing it. */ | |
1010 | /* ... which is an evident application bug. --ANK */ | |
1011 | release_sock(sk); | |
1012 | ||
afd46503 | 1013 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("cork app bug 2\n")); |
db8dac20 DM |
1014 | err = -EINVAL; |
1015 | goto out; | |
1016 | } | |
1017 | /* | |
1018 | * Now cork the socket to pend data. | |
1019 | */ | |
b6f21b26 DM |
1020 | fl4 = &inet->cork.fl.u.ip4; |
1021 | fl4->daddr = daddr; | |
1022 | fl4->saddr = saddr; | |
9cce96df DM |
1023 | fl4->fl4_dport = dport; |
1024 | fl4->fl4_sport = inet->inet_sport; | |
db8dac20 DM |
1025 | up->pending = AF_INET; |
1026 | ||
1027 | do_append_data: | |
1028 | up->len += ulen; | |
f5fca608 DM |
1029 | err = ip_append_data(sk, fl4, getfrag, msg->msg_iov, ulen, |
1030 | sizeof(struct udphdr), &ipc, &rt, | |
1031 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
db8dac20 DM |
1032 | if (err) |
1033 | udp_flush_pending_frames(sk); | |
1034 | else if (!corkreq) | |
1035 | err = udp_push_pending_frames(sk); | |
1036 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
1037 | up->pending = 0; | |
1038 | release_sock(sk); | |
1039 | ||
1040 | out: | |
1041 | ip_rt_put(rt); | |
1042 | if (free) | |
1043 | kfree(ipc.opt); | |
1044 | if (!err) | |
1045 | return len; | |
1046 | /* | |
1047 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1048 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1049 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1050 | * things). We could add another new stat but at least for now that | |
1051 | * seems like overkill. | |
1052 | */ | |
1053 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
629ca23c PE |
1054 | UDP_INC_STATS_USER(sock_net(sk), |
1055 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
1056 | } |
1057 | return err; | |
1058 | ||
1059 | do_confirm: | |
d8d1f30b | 1060 | dst_confirm(&rt->dst); |
db8dac20 DM |
1061 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1062 | goto back_from_confirm; | |
1063 | err = 0; | |
1064 | goto out; | |
1065 | } | |
c482c568 | 1066 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
1067 | |
1068 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
1069 | size_t size, int flags) | |
1070 | { | |
f5fca608 | 1071 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
1072 | struct udp_sock *up = udp_sk(sk); |
1073 | int ret; | |
1074 | ||
1075 | if (!up->pending) { | |
1076 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
1077 | ||
1078 | /* Call udp_sendmsg to specify destination address which | |
1079 | * sendpage interface can't pass. | |
1080 | * This will succeed only when the socket is connected. | |
1081 | */ | |
1082 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
1083 | if (ret < 0) | |
1084 | return ret; | |
1085 | } | |
1086 | ||
1087 | lock_sock(sk); | |
1088 | ||
1089 | if (unlikely(!up->pending)) { | |
1090 | release_sock(sk); | |
1091 | ||
afd46503 | 1092 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("udp cork app bug 3\n")); |
db8dac20 DM |
1093 | return -EINVAL; |
1094 | } | |
1095 | ||
f5fca608 DM |
1096 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
1097 | page, offset, size, flags); | |
db8dac20 DM |
1098 | if (ret == -EOPNOTSUPP) { |
1099 | release_sock(sk); | |
1100 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1101 | size, flags); | |
1102 | } | |
1103 | if (ret < 0) { | |
1104 | udp_flush_pending_frames(sk); | |
1105 | goto out; | |
1106 | } | |
1107 | ||
1108 | up->len += size; | |
1109 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1110 | ret = udp_push_pending_frames(sk); | |
1111 | if (!ret) | |
1112 | ret = size; | |
1113 | out: | |
1114 | release_sock(sk); | |
1115 | return ret; | |
1116 | } | |
1117 | ||
85584672 ED |
1118 | |
1119 | /** | |
1120 | * first_packet_length - return length of first packet in receive queue | |
1121 | * @sk: socket | |
1122 | * | |
1123 | * Drops all bad checksum frames, until a valid one is found. | |
1124 | * Returns the length of found skb, or 0 if none is found. | |
1125 | */ | |
1126 | static unsigned int first_packet_length(struct sock *sk) | |
1127 | { | |
1128 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
1129 | struct sk_buff *skb; | |
1130 | unsigned int res; | |
1131 | ||
1132 | __skb_queue_head_init(&list_kill); | |
1133 | ||
1134 | spin_lock_bh(&rcvq->lock); | |
1135 | while ((skb = skb_peek(rcvq)) != NULL && | |
1136 | udp_lib_checksum_complete(skb)) { | |
6a5dc9e5 ED |
1137 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, |
1138 | IS_UDPLITE(sk)); | |
85584672 ED |
1139 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, |
1140 | IS_UDPLITE(sk)); | |
8edf19c2 | 1141 | atomic_inc(&sk->sk_drops); |
85584672 ED |
1142 | __skb_unlink(skb, rcvq); |
1143 | __skb_queue_tail(&list_kill, skb); | |
1144 | } | |
1145 | res = skb ? skb->len : 0; | |
1146 | spin_unlock_bh(&rcvq->lock); | |
1147 | ||
1148 | if (!skb_queue_empty(&list_kill)) { | |
8a74ad60 ED |
1149 | bool slow = lock_sock_fast(sk); |
1150 | ||
85584672 ED |
1151 | __skb_queue_purge(&list_kill); |
1152 | sk_mem_reclaim_partial(sk); | |
8a74ad60 | 1153 | unlock_sock_fast(sk, slow); |
85584672 ED |
1154 | } |
1155 | return res; | |
1156 | } | |
1157 | ||
1da177e4 LT |
1158 | /* |
1159 | * IOCTL requests applicable to the UDP protocol | |
1160 | */ | |
e905a9ed | 1161 | |
1da177e4 LT |
1162 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1163 | { | |
6516c655 SH |
1164 | switch (cmd) { |
1165 | case SIOCOUTQ: | |
1da177e4 | 1166 | { |
31e6d363 ED |
1167 | int amount = sk_wmem_alloc_get(sk); |
1168 | ||
6516c655 SH |
1169 | return put_user(amount, (int __user *)arg); |
1170 | } | |
1da177e4 | 1171 | |
6516c655 SH |
1172 | case SIOCINQ: |
1173 | { | |
85584672 | 1174 | unsigned int amount = first_packet_length(sk); |
6516c655 | 1175 | |
85584672 | 1176 | if (amount) |
6516c655 SH |
1177 | /* |
1178 | * We will only return the amount | |
1179 | * of this packet since that is all | |
1180 | * that will be read. | |
1181 | */ | |
85584672 ED |
1182 | amount -= sizeof(struct udphdr); |
1183 | ||
6516c655 SH |
1184 | return put_user(amount, (int __user *)arg); |
1185 | } | |
1da177e4 | 1186 | |
6516c655 SH |
1187 | default: |
1188 | return -ENOIOCTLCMD; | |
1da177e4 | 1189 | } |
6516c655 SH |
1190 | |
1191 | return 0; | |
1da177e4 | 1192 | } |
c482c568 | 1193 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1194 | |
db8dac20 DM |
1195 | /* |
1196 | * This should be easy, if there is something there we | |
1197 | * return it, otherwise we block. | |
1198 | */ | |
1199 | ||
1200 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
1201 | size_t len, int noblock, int flags, int *addr_len) | |
1202 | { | |
1203 | struct inet_sock *inet = inet_sk(sk); | |
1204 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
1205 | struct sk_buff *skb; | |
59c2cdae | 1206 | unsigned int ulen, copied; |
3f518bf7 | 1207 | int peeked, off = 0; |
db8dac20 DM |
1208 | int err; |
1209 | int is_udplite = IS_UDPLITE(sk); | |
8a74ad60 | 1210 | bool slow; |
db8dac20 DM |
1211 | |
1212 | /* | |
1213 | * Check any passed addresses | |
1214 | */ | |
1215 | if (addr_len) | |
c482c568 | 1216 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1217 | |
1218 | if (flags & MSG_ERRQUEUE) | |
1219 | return ip_recv_error(sk, msg, len); | |
1220 | ||
1221 | try_again: | |
1222 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), | |
3f518bf7 | 1223 | &peeked, &off, &err); |
db8dac20 DM |
1224 | if (!skb) |
1225 | goto out; | |
1226 | ||
1227 | ulen = skb->len - sizeof(struct udphdr); | |
59c2cdae DM |
1228 | copied = len; |
1229 | if (copied > ulen) | |
1230 | copied = ulen; | |
1231 | else if (copied < ulen) | |
db8dac20 DM |
1232 | msg->msg_flags |= MSG_TRUNC; |
1233 | ||
1234 | /* | |
1235 | * If checksum is needed at all, try to do it while copying the | |
1236 | * data. If the data is truncated, or if we only want a partial | |
1237 | * coverage checksum (UDP-Lite), do it before the copy. | |
1238 | */ | |
1239 | ||
59c2cdae | 1240 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
db8dac20 DM |
1241 | if (udp_lib_checksum_complete(skb)) |
1242 | goto csum_copy_err; | |
1243 | } | |
1244 | ||
1245 | if (skb_csum_unnecessary(skb)) | |
1246 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), | |
59c2cdae | 1247 | msg->msg_iov, copied); |
db8dac20 | 1248 | else { |
c482c568 ED |
1249 | err = skb_copy_and_csum_datagram_iovec(skb, |
1250 | sizeof(struct udphdr), | |
1251 | msg->msg_iov); | |
db8dac20 DM |
1252 | |
1253 | if (err == -EINVAL) | |
1254 | goto csum_copy_err; | |
1255 | } | |
1256 | ||
22911fc5 ED |
1257 | if (unlikely(err)) { |
1258 | trace_kfree_skb(skb, udp_recvmsg); | |
979402b1 ED |
1259 | if (!peeked) { |
1260 | atomic_inc(&sk->sk_drops); | |
1261 | UDP_INC_STATS_USER(sock_net(sk), | |
1262 | UDP_MIB_INERRORS, is_udplite); | |
1263 | } | |
db8dac20 | 1264 | goto out_free; |
22911fc5 | 1265 | } |
db8dac20 DM |
1266 | |
1267 | if (!peeked) | |
629ca23c PE |
1268 | UDP_INC_STATS_USER(sock_net(sk), |
1269 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1270 | |
3b885787 | 1271 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1272 | |
1273 | /* Copy the address. */ | |
c482c568 | 1274 | if (sin) { |
db8dac20 DM |
1275 | sin->sin_family = AF_INET; |
1276 | sin->sin_port = udp_hdr(skb)->source; | |
1277 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1278 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1279 | } | |
1280 | if (inet->cmsg_flags) | |
1281 | ip_cmsg_recv(msg, skb); | |
1282 | ||
59c2cdae | 1283 | err = copied; |
db8dac20 DM |
1284 | if (flags & MSG_TRUNC) |
1285 | err = ulen; | |
1286 | ||
1287 | out_free: | |
9d410c79 | 1288 | skb_free_datagram_locked(sk, skb); |
db8dac20 DM |
1289 | out: |
1290 | return err; | |
1291 | ||
1292 | csum_copy_err: | |
8a74ad60 | 1293 | slow = lock_sock_fast(sk); |
6a5dc9e5 ED |
1294 | if (!skb_kill_datagram(sk, skb, flags)) { |
1295 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
629ca23c | 1296 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
6a5dc9e5 | 1297 | } |
8a74ad60 | 1298 | unlock_sock_fast(sk, slow); |
db8dac20 DM |
1299 | |
1300 | if (noblock) | |
1301 | return -EAGAIN; | |
9cfaa8de XZ |
1302 | |
1303 | /* starting over for a new packet */ | |
1304 | msg->msg_flags &= ~MSG_TRUNC; | |
db8dac20 DM |
1305 | goto try_again; |
1306 | } | |
1307 | ||
1308 | ||
1da177e4 LT |
1309 | int udp_disconnect(struct sock *sk, int flags) |
1310 | { | |
1311 | struct inet_sock *inet = inet_sk(sk); | |
1312 | /* | |
1313 | * 1003.1g - break association. | |
1314 | */ | |
e905a9ed | 1315 | |
1da177e4 | 1316 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1317 | inet->inet_daddr = 0; |
1318 | inet->inet_dport = 0; | |
bdeab991 | 1319 | sock_rps_reset_rxhash(sk); |
1da177e4 LT |
1320 | sk->sk_bound_dev_if = 0; |
1321 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1322 | inet_reset_saddr(sk); | |
1323 | ||
1324 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1325 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1326 | inet->inet_sport = 0; |
1da177e4 LT |
1327 | } |
1328 | sk_dst_reset(sk); | |
1329 | return 0; | |
1330 | } | |
c482c568 | 1331 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1332 | |
645ca708 ED |
1333 | void udp_lib_unhash(struct sock *sk) |
1334 | { | |
723b4610 ED |
1335 | if (sk_hashed(sk)) { |
1336 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1337 | struct udp_hslot *hslot, *hslot2; |
1338 | ||
1339 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1340 | udp_sk(sk)->udp_port_hash); | |
1341 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1342 | |
723b4610 ED |
1343 | spin_lock_bh(&hslot->lock); |
1344 | if (sk_nulls_del_node_init_rcu(sk)) { | |
fdcc8aa9 | 1345 | hslot->count--; |
c720c7e8 | 1346 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1347 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1348 | |
1349 | spin_lock(&hslot2->lock); | |
1350 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1351 | hslot2->count--; | |
1352 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1353 | } |
1354 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1355 | } |
645ca708 ED |
1356 | } |
1357 | EXPORT_SYMBOL(udp_lib_unhash); | |
1358 | ||
719f8358 ED |
1359 | /* |
1360 | * inet_rcv_saddr was changed, we must rehash secondary hash | |
1361 | */ | |
1362 | void udp_lib_rehash(struct sock *sk, u16 newhash) | |
1363 | { | |
1364 | if (sk_hashed(sk)) { | |
1365 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
1366 | struct udp_hslot *hslot, *hslot2, *nhslot2; | |
1367 | ||
1368 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
1369 | nhslot2 = udp_hashslot2(udptable, newhash); | |
1370 | udp_sk(sk)->udp_portaddr_hash = newhash; | |
1371 | if (hslot2 != nhslot2) { | |
1372 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1373 | udp_sk(sk)->udp_port_hash); | |
1374 | /* we must lock primary chain too */ | |
1375 | spin_lock_bh(&hslot->lock); | |
1376 | ||
1377 | spin_lock(&hslot2->lock); | |
1378 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1379 | hslot2->count--; | |
1380 | spin_unlock(&hslot2->lock); | |
1381 | ||
1382 | spin_lock(&nhslot2->lock); | |
1383 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
1384 | &nhslot2->head); | |
1385 | nhslot2->count++; | |
1386 | spin_unlock(&nhslot2->lock); | |
1387 | ||
1388 | spin_unlock_bh(&hslot->lock); | |
1389 | } | |
1390 | } | |
1391 | } | |
1392 | EXPORT_SYMBOL(udp_lib_rehash); | |
1393 | ||
1394 | static void udp_v4_rehash(struct sock *sk) | |
1395 | { | |
1396 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), | |
1397 | inet_sk(sk)->inet_rcv_saddr, | |
1398 | inet_sk(sk)->inet_num); | |
1399 | udp_lib_rehash(sk, new_hash); | |
1400 | } | |
1401 | ||
93821778 HX |
1402 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1403 | { | |
fec5e652 | 1404 | int rc; |
766e9037 | 1405 | |
fec5e652 | 1406 | if (inet_sk(sk)->inet_daddr) |
bdeab991 | 1407 | sock_rps_save_rxhash(sk, skb); |
fec5e652 | 1408 | |
d826eb14 | 1409 | rc = sock_queue_rcv_skb(sk, skb); |
766e9037 ED |
1410 | if (rc < 0) { |
1411 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1412 | |
93821778 | 1413 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1414 | if (rc == -ENOMEM) |
93821778 HX |
1415 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1416 | is_udplite); | |
766e9037 ED |
1417 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
1418 | kfree_skb(skb); | |
296f7ea7 | 1419 | trace_udp_fail_queue_rcv_skb(rc, sk); |
766e9037 | 1420 | return -1; |
93821778 HX |
1421 | } |
1422 | ||
1423 | return 0; | |
1424 | ||
93821778 HX |
1425 | } |
1426 | ||
447167bf ED |
1427 | static struct static_key udp_encap_needed __read_mostly; |
1428 | void udp_encap_enable(void) | |
1429 | { | |
1430 | if (!static_key_enabled(&udp_encap_needed)) | |
1431 | static_key_slow_inc(&udp_encap_needed); | |
1432 | } | |
1433 | EXPORT_SYMBOL(udp_encap_enable); | |
1434 | ||
db8dac20 DM |
1435 | /* returns: |
1436 | * -1: error | |
1437 | * 0: success | |
1438 | * >0: "udp encap" protocol resubmission | |
1439 | * | |
1440 | * Note that in the success and error cases, the skb is assumed to | |
1441 | * have either been requeued or freed. | |
1442 | */ | |
c482c568 | 1443 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1444 | { |
1445 | struct udp_sock *up = udp_sk(sk); | |
1446 | int rc; | |
1447 | int is_udplite = IS_UDPLITE(sk); | |
1448 | ||
1449 | /* | |
1450 | * Charge it to the socket, dropping if the queue is full. | |
1451 | */ | |
1452 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1453 | goto drop; | |
1454 | nf_reset(skb); | |
1455 | ||
447167bf | 1456 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
0ad92ad0 ED |
1457 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
1458 | ||
db8dac20 DM |
1459 | /* |
1460 | * This is an encapsulation socket so pass the skb to | |
1461 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1462 | * fall through and pass this up the UDP socket. | |
1463 | * up->encap_rcv() returns the following value: | |
1464 | * =0 if skb was successfully passed to the encap | |
1465 | * handler or was discarded by it. | |
1466 | * >0 if skb should be passed on to UDP. | |
1467 | * <0 if skb should be resubmitted as proto -N | |
1468 | */ | |
1469 | ||
1470 | /* if we're overly short, let UDP handle it */ | |
0ad92ad0 ED |
1471 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
1472 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
db8dac20 DM |
1473 | int ret; |
1474 | ||
0ad92ad0 | 1475 | ret = encap_rcv(sk, skb); |
db8dac20 | 1476 | if (ret <= 0) { |
0283328e PE |
1477 | UDP_INC_STATS_BH(sock_net(sk), |
1478 | UDP_MIB_INDATAGRAMS, | |
db8dac20 DM |
1479 | is_udplite); |
1480 | return -ret; | |
1481 | } | |
1482 | } | |
1483 | ||
1484 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1485 | } | |
1486 | ||
1487 | /* | |
1488 | * UDP-Lite specific tests, ignored on UDP sockets | |
1489 | */ | |
1490 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1491 | ||
1492 | /* | |
1493 | * MIB statistics other than incrementing the error count are | |
1494 | * disabled for the following two types of errors: these depend | |
1495 | * on the application settings, not on the functioning of the | |
1496 | * protocol stack as such. | |
1497 | * | |
1498 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1499 | * way ... to ... at least let the receiving application block | |
1500 | * delivery of packets with coverage values less than a value | |
1501 | * provided by the application." | |
1502 | */ | |
1503 | if (up->pcrlen == 0) { /* full coverage was set */ | |
afd46503 JP |
1504 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: partial coverage %d while full coverage %d requested\n", |
1505 | UDP_SKB_CB(skb)->cscov, skb->len); | |
db8dac20 DM |
1506 | goto drop; |
1507 | } | |
1508 | /* The next case involves violating the min. coverage requested | |
1509 | * by the receiver. This is subtle: if receiver wants x and x is | |
1510 | * greater than the buffersize/MTU then receiver will complain | |
1511 | * that it wants x while sender emits packets of smaller size y. | |
1512 | * Therefore the above ...()->partial_cov statement is essential. | |
1513 | */ | |
1514 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
afd46503 JP |
1515 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: coverage %d too small, need min %d\n", |
1516 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
db8dac20 DM |
1517 | goto drop; |
1518 | } | |
1519 | } | |
1520 | ||
33d480ce ED |
1521 | if (rcu_access_pointer(sk->sk_filter) && |
1522 | udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 1523 | goto csum_error; |
db8dac20 | 1524 | |
c377411f | 1525 | |
f545a38f | 1526 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
c377411f ED |
1527 | goto drop; |
1528 | ||
93821778 | 1529 | rc = 0; |
db8dac20 | 1530 | |
d826eb14 | 1531 | ipv4_pktinfo_prepare(skb); |
93821778 HX |
1532 | bh_lock_sock(sk); |
1533 | if (!sock_owned_by_user(sk)) | |
1534 | rc = __udp_queue_rcv_skb(sk, skb); | |
f545a38f | 1535 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
55349790 ZY |
1536 | bh_unlock_sock(sk); |
1537 | goto drop; | |
1538 | } | |
93821778 HX |
1539 | bh_unlock_sock(sk); |
1540 | ||
1541 | return rc; | |
db8dac20 | 1542 | |
6a5dc9e5 ED |
1543 | csum_error: |
1544 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); | |
db8dac20 | 1545 | drop: |
0283328e | 1546 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1547 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1548 | kfree_skb(skb); |
1549 | return -1; | |
1550 | } | |
1551 | ||
1240d137 ED |
1552 | |
1553 | static void flush_stack(struct sock **stack, unsigned int count, | |
1554 | struct sk_buff *skb, unsigned int final) | |
1555 | { | |
1556 | unsigned int i; | |
1557 | struct sk_buff *skb1 = NULL; | |
f6b8f32c | 1558 | struct sock *sk; |
1240d137 ED |
1559 | |
1560 | for (i = 0; i < count; i++) { | |
f6b8f32c | 1561 | sk = stack[i]; |
1240d137 ED |
1562 | if (likely(skb1 == NULL)) |
1563 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
1564 | ||
f6b8f32c ED |
1565 | if (!skb1) { |
1566 | atomic_inc(&sk->sk_drops); | |
1567 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
1568 | IS_UDPLITE(sk)); | |
1569 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1570 | IS_UDPLITE(sk)); | |
1571 | } | |
1572 | ||
1573 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) | |
1240d137 ED |
1574 | skb1 = NULL; |
1575 | } | |
1576 | if (unlikely(skb1)) | |
1577 | kfree_skb(skb1); | |
1578 | } | |
1579 | ||
db8dac20 DM |
1580 | /* |
1581 | * Multicasts and broadcasts go to each listener. | |
1582 | * | |
1240d137 | 1583 | * Note: called only from the BH handler context. |
db8dac20 | 1584 | */ |
e3163493 | 1585 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1586 | struct udphdr *uh, |
1587 | __be32 saddr, __be32 daddr, | |
645ca708 | 1588 | struct udp_table *udptable) |
db8dac20 | 1589 | { |
1240d137 | 1590 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
f86dcc5a | 1591 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
db8dac20 | 1592 | int dif; |
1240d137 | 1593 | unsigned int i, count = 0; |
db8dac20 | 1594 | |
645ca708 | 1595 | spin_lock(&hslot->lock); |
88ab1932 | 1596 | sk = sk_nulls_head(&hslot->head); |
db8dac20 | 1597 | dif = skb->dev->ifindex; |
920a4611 | 1598 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1240d137 ED |
1599 | while (sk) { |
1600 | stack[count++] = sk; | |
1601 | sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, | |
1602 | daddr, uh->source, saddr, dif); | |
1603 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
1604 | if (!sk) | |
1605 | break; | |
1606 | flush_stack(stack, count, skb, ~0); | |
1607 | count = 0; | |
1608 | } | |
1609 | } | |
1610 | /* | |
1611 | * before releasing chain lock, we must take a reference on sockets | |
1612 | */ | |
1613 | for (i = 0; i < count; i++) | |
1614 | sock_hold(stack[i]); | |
1615 | ||
645ca708 | 1616 | spin_unlock(&hslot->lock); |
1240d137 ED |
1617 | |
1618 | /* | |
1619 | * do the slow work with no lock held | |
1620 | */ | |
1621 | if (count) { | |
1622 | flush_stack(stack, count, skb, count - 1); | |
1623 | ||
1624 | for (i = 0; i < count; i++) | |
1625 | sock_put(stack[i]); | |
1626 | } else { | |
1627 | kfree_skb(skb); | |
1628 | } | |
db8dac20 DM |
1629 | return 0; |
1630 | } | |
1631 | ||
1632 | /* Initialize UDP checksum. If exited with zero value (success), | |
1633 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1634 | * Otherwise, csum completion requires chacksumming packet body, | |
1635 | * including udp header and folding it to skb->csum. | |
1636 | */ | |
1637 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1638 | int proto) | |
1639 | { | |
1640 | const struct iphdr *iph; | |
1641 | int err; | |
1642 | ||
1643 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1644 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1645 | ||
1646 | if (proto == IPPROTO_UDPLITE) { | |
1647 | err = udplite_checksum_init(skb, uh); | |
1648 | if (err) | |
1649 | return err; | |
1650 | } | |
1651 | ||
1652 | iph = ip_hdr(skb); | |
1653 | if (uh->check == 0) { | |
1654 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1655 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
c482c568 | 1656 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
db8dac20 DM |
1657 | proto, skb->csum)) |
1658 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1659 | } | |
1660 | if (!skb_csum_unnecessary(skb)) | |
1661 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
1662 | skb->len, proto, 0); | |
1663 | /* Probably, we should checksum udp header (it should be in cache | |
1664 | * in any case) and data in tiny packets (< rx copybreak). | |
1665 | */ | |
1666 | ||
1667 | return 0; | |
1668 | } | |
1669 | ||
1670 | /* | |
1671 | * All we need to do is get the socket, and then do a checksum. | |
1672 | */ | |
1673 | ||
645ca708 | 1674 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1675 | int proto) |
1676 | { | |
1677 | struct sock *sk; | |
7b5e56f9 | 1678 | struct udphdr *uh; |
db8dac20 | 1679 | unsigned short ulen; |
adf30907 | 1680 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1681 | __be32 saddr, daddr; |
0283328e | 1682 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1683 | |
1684 | /* | |
1685 | * Validate the packet. | |
1686 | */ | |
1687 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1688 | goto drop; /* No space for header. */ | |
1689 | ||
7b5e56f9 | 1690 | uh = udp_hdr(skb); |
db8dac20 | 1691 | ulen = ntohs(uh->len); |
ccc2d97c BM |
1692 | saddr = ip_hdr(skb)->saddr; |
1693 | daddr = ip_hdr(skb)->daddr; | |
1694 | ||
db8dac20 DM |
1695 | if (ulen > skb->len) |
1696 | goto short_packet; | |
1697 | ||
1698 | if (proto == IPPROTO_UDP) { | |
1699 | /* UDP validates ulen. */ | |
1700 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1701 | goto short_packet; | |
1702 | uh = udp_hdr(skb); | |
1703 | } | |
1704 | ||
1705 | if (udp4_csum_init(skb, uh, proto)) | |
1706 | goto csum_error; | |
1707 | ||
1708 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) | |
e3163493 PE |
1709 | return __udp4_lib_mcast_deliver(net, skb, uh, |
1710 | saddr, daddr, udptable); | |
db8dac20 | 1711 | |
607c4aaf | 1712 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
db8dac20 DM |
1713 | |
1714 | if (sk != NULL) { | |
a5b50476 ET |
1715 | int ret; |
1716 | ||
8b80cda5 | 1717 | sk_mark_napi_id(sk, skb); |
a5b50476 | 1718 | ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1719 | sock_put(sk); |
1720 | ||
1721 | /* a return value > 0 means to resubmit the input, but | |
1722 | * it wants the return to be -protocol, or 0 | |
1723 | */ | |
1724 | if (ret > 0) | |
1725 | return -ret; | |
1726 | return 0; | |
1727 | } | |
1728 | ||
1729 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1730 | goto drop; | |
1731 | nf_reset(skb); | |
1732 | ||
1733 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1734 | if (udp_lib_checksum_complete(skb)) | |
1735 | goto csum_error; | |
1736 | ||
0283328e | 1737 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1738 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1739 | ||
1740 | /* | |
1741 | * Hmm. We got an UDP packet to a port to which we | |
1742 | * don't wanna listen. Ignore it. | |
1743 | */ | |
1744 | kfree_skb(skb); | |
1745 | return 0; | |
1746 | ||
1747 | short_packet: | |
673d57e7 | 1748 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
afd46503 JP |
1749 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1750 | &saddr, ntohs(uh->source), | |
1751 | ulen, skb->len, | |
1752 | &daddr, ntohs(uh->dest)); | |
db8dac20 DM |
1753 | goto drop; |
1754 | ||
1755 | csum_error: | |
1756 | /* | |
1757 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1758 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1759 | */ | |
673d57e7 | 1760 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
afd46503 JP |
1761 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1762 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), | |
db8dac20 | 1763 | ulen); |
6a5dc9e5 | 1764 | UDP_INC_STATS_BH(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 | 1765 | drop: |
0283328e | 1766 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1767 | kfree_skb(skb); |
1768 | return 0; | |
1769 | } | |
1770 | ||
1771 | int udp_rcv(struct sk_buff *skb) | |
1772 | { | |
645ca708 | 1773 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1774 | } |
1775 | ||
7d06b2e0 | 1776 | void udp_destroy_sock(struct sock *sk) |
db8dac20 | 1777 | { |
44046a59 | 1778 | struct udp_sock *up = udp_sk(sk); |
8a74ad60 | 1779 | bool slow = lock_sock_fast(sk); |
db8dac20 | 1780 | udp_flush_pending_frames(sk); |
8a74ad60 | 1781 | unlock_sock_fast(sk, slow); |
44046a59 TP |
1782 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
1783 | void (*encap_destroy)(struct sock *sk); | |
1784 | encap_destroy = ACCESS_ONCE(up->encap_destroy); | |
1785 | if (encap_destroy) | |
1786 | encap_destroy(sk); | |
1787 | } | |
db8dac20 DM |
1788 | } |
1789 | ||
1da177e4 LT |
1790 | /* |
1791 | * Socket option code for UDP | |
1792 | */ | |
4c0a6cb0 | 1793 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1794 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1795 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1796 | { |
1797 | struct udp_sock *up = udp_sk(sk); | |
1798 | int val; | |
1799 | int err = 0; | |
b2bf1e26 | 1800 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1801 | |
c482c568 | 1802 | if (optlen < sizeof(int)) |
1da177e4 LT |
1803 | return -EINVAL; |
1804 | ||
1805 | if (get_user(val, (int __user *)optval)) | |
1806 | return -EFAULT; | |
1807 | ||
6516c655 | 1808 | switch (optname) { |
1da177e4 LT |
1809 | case UDP_CORK: |
1810 | if (val != 0) { | |
1811 | up->corkflag = 1; | |
1812 | } else { | |
1813 | up->corkflag = 0; | |
1814 | lock_sock(sk); | |
4c0a6cb0 | 1815 | (*push_pending_frames)(sk); |
1da177e4 LT |
1816 | release_sock(sk); |
1817 | } | |
1818 | break; | |
e905a9ed | 1819 | |
1da177e4 LT |
1820 | case UDP_ENCAP: |
1821 | switch (val) { | |
1822 | case 0: | |
1823 | case UDP_ENCAP_ESPINUDP: | |
1824 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1825 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1826 | /* FALLTHROUGH */ | |
342f0234 | 1827 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 | 1828 | up->encap_type = val; |
447167bf | 1829 | udp_encap_enable(); |
1da177e4 LT |
1830 | break; |
1831 | default: | |
1832 | err = -ENOPROTOOPT; | |
1833 | break; | |
1834 | } | |
1835 | break; | |
1836 | ||
ba4e58ec GR |
1837 | /* |
1838 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1839 | */ | |
1840 | /* The sender sets actual checksum coverage length via this option. | |
1841 | * The case coverage > packet length is handled by send module. */ | |
1842 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 1843 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1844 | return -ENOPROTOOPT; |
1845 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1846 | val = 8; | |
4be929be AD |
1847 | else if (val > USHRT_MAX) |
1848 | val = USHRT_MAX; | |
ba4e58ec GR |
1849 | up->pcslen = val; |
1850 | up->pcflag |= UDPLITE_SEND_CC; | |
1851 | break; | |
1852 | ||
e905a9ed YH |
1853 | /* The receiver specifies a minimum checksum coverage value. To make |
1854 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1855 | * used, this again means full checksum coverage. */ |
1856 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 1857 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1858 | return -ENOPROTOOPT; |
1859 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1860 | val = 8; | |
4be929be AD |
1861 | else if (val > USHRT_MAX) |
1862 | val = USHRT_MAX; | |
ba4e58ec GR |
1863 | up->pcrlen = val; |
1864 | up->pcflag |= UDPLITE_RECV_CC; | |
1865 | break; | |
1866 | ||
1da177e4 LT |
1867 | default: |
1868 | err = -ENOPROTOOPT; | |
1869 | break; | |
6516c655 | 1870 | } |
1da177e4 LT |
1871 | |
1872 | return err; | |
1873 | } | |
c482c568 | 1874 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 1875 | |
db8dac20 | 1876 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1877 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1878 | { |
1879 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1880 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1881 | udp_push_pending_frames); | |
1882 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
1883 | } | |
1884 | ||
1885 | #ifdef CONFIG_COMPAT | |
1886 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1887 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1888 | { |
1889 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1890 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1891 | udp_push_pending_frames); | |
1892 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
1893 | } | |
1894 | #endif | |
1895 | ||
4c0a6cb0 GR |
1896 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1897 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1898 | { |
1899 | struct udp_sock *up = udp_sk(sk); | |
1900 | int val, len; | |
1901 | ||
c482c568 | 1902 | if (get_user(len, optlen)) |
1da177e4 LT |
1903 | return -EFAULT; |
1904 | ||
1905 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1906 | |
6516c655 | 1907 | if (len < 0) |
1da177e4 LT |
1908 | return -EINVAL; |
1909 | ||
6516c655 | 1910 | switch (optname) { |
1da177e4 LT |
1911 | case UDP_CORK: |
1912 | val = up->corkflag; | |
1913 | break; | |
1914 | ||
1915 | case UDP_ENCAP: | |
1916 | val = up->encap_type; | |
1917 | break; | |
1918 | ||
ba4e58ec GR |
1919 | /* The following two cannot be changed on UDP sockets, the return is |
1920 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1921 | case UDPLITE_SEND_CSCOV: | |
1922 | val = up->pcslen; | |
1923 | break; | |
1924 | ||
1925 | case UDPLITE_RECV_CSCOV: | |
1926 | val = up->pcrlen; | |
1927 | break; | |
1928 | ||
1da177e4 LT |
1929 | default: |
1930 | return -ENOPROTOOPT; | |
6516c655 | 1931 | } |
1da177e4 | 1932 | |
6516c655 | 1933 | if (put_user(len, optlen)) |
e905a9ed | 1934 | return -EFAULT; |
c482c568 | 1935 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 1936 | return -EFAULT; |
e905a9ed | 1937 | return 0; |
1da177e4 | 1938 | } |
c482c568 | 1939 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 1940 | |
db8dac20 DM |
1941 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1942 | char __user *optval, int __user *optlen) | |
1943 | { | |
1944 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1945 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1946 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
1947 | } | |
1948 | ||
1949 | #ifdef CONFIG_COMPAT | |
1950 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
1951 | char __user *optval, int __user *optlen) | |
1952 | { | |
1953 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1954 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1955 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
1956 | } | |
1957 | #endif | |
1da177e4 LT |
1958 | /** |
1959 | * udp_poll - wait for a UDP event. | |
1960 | * @file - file struct | |
1961 | * @sock - socket | |
1962 | * @wait - poll table | |
1963 | * | |
e905a9ed | 1964 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1965 | * blocking sockets. If application is using a blocking fd |
1966 | * and a packet with checksum error is in the queue; | |
1967 | * then it could get return from select indicating data available | |
1968 | * but then block when reading it. Add special case code | |
1969 | * to work around these arguably broken applications. | |
1970 | */ | |
1971 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
1972 | { | |
1973 | unsigned int mask = datagram_poll(file, sock, wait); | |
1974 | struct sock *sk = sock->sk; | |
ba4e58ec | 1975 | |
c3f1dbaf DM |
1976 | sock_rps_record_flow(sk); |
1977 | ||
1da177e4 | 1978 | /* Check for false positives due to checksum errors */ |
85584672 ED |
1979 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
1980 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
1981 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
1982 | |
1983 | return mask; | |
e905a9ed | 1984 | |
1da177e4 | 1985 | } |
c482c568 | 1986 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 1987 | |
db8dac20 DM |
1988 | struct proto udp_prot = { |
1989 | .name = "UDP", | |
1990 | .owner = THIS_MODULE, | |
1991 | .close = udp_lib_close, | |
1992 | .connect = ip4_datagram_connect, | |
1993 | .disconnect = udp_disconnect, | |
1994 | .ioctl = udp_ioctl, | |
1995 | .destroy = udp_destroy_sock, | |
1996 | .setsockopt = udp_setsockopt, | |
1997 | .getsockopt = udp_getsockopt, | |
1998 | .sendmsg = udp_sendmsg, | |
1999 | .recvmsg = udp_recvmsg, | |
2000 | .sendpage = udp_sendpage, | |
93821778 | 2001 | .backlog_rcv = __udp_queue_rcv_skb, |
8141ed9f | 2002 | .release_cb = ip4_datagram_release_cb, |
db8dac20 DM |
2003 | .hash = udp_lib_hash, |
2004 | .unhash = udp_lib_unhash, | |
719f8358 | 2005 | .rehash = udp_v4_rehash, |
db8dac20 DM |
2006 | .get_port = udp_v4_get_port, |
2007 | .memory_allocated = &udp_memory_allocated, | |
2008 | .sysctl_mem = sysctl_udp_mem, | |
2009 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
2010 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
2011 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 2012 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 2013 | .h.udp_table = &udp_table, |
db8dac20 DM |
2014 | #ifdef CONFIG_COMPAT |
2015 | .compat_setsockopt = compat_udp_setsockopt, | |
2016 | .compat_getsockopt = compat_udp_getsockopt, | |
2017 | #endif | |
fcbdf09d | 2018 | .clear_sk = sk_prot_clear_portaddr_nulls, |
db8dac20 | 2019 | }; |
c482c568 | 2020 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
2021 | |
2022 | /* ------------------------------------------------------------------------ */ | |
2023 | #ifdef CONFIG_PROC_FS | |
2024 | ||
645ca708 | 2025 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
2026 | { |
2027 | struct sock *sk; | |
2028 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2029 | struct net *net = seq_file_net(seq); |
1da177e4 | 2030 | |
f86dcc5a ED |
2031 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
2032 | ++state->bucket) { | |
88ab1932 | 2033 | struct hlist_nulls_node *node; |
645ca708 | 2034 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a ED |
2035 | |
2036 | if (hlist_nulls_empty(&hslot->head)) | |
2037 | continue; | |
2038 | ||
645ca708 | 2039 | spin_lock_bh(&hslot->lock); |
88ab1932 | 2040 | sk_nulls_for_each(sk, node, &hslot->head) { |
878628fb | 2041 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 2042 | continue; |
1da177e4 LT |
2043 | if (sk->sk_family == state->family) |
2044 | goto found; | |
2045 | } | |
645ca708 | 2046 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
2047 | } |
2048 | sk = NULL; | |
2049 | found: | |
2050 | return sk; | |
2051 | } | |
2052 | ||
2053 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
2054 | { | |
2055 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2056 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2057 | |
2058 | do { | |
88ab1932 | 2059 | sk = sk_nulls_next(sk); |
878628fb | 2060 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 2061 | |
645ca708 | 2062 | if (!sk) { |
f86dcc5a | 2063 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 2064 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 2065 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
2066 | } |
2067 | return sk; | |
2068 | } | |
2069 | ||
2070 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
2071 | { | |
645ca708 | 2072 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
2073 | |
2074 | if (sk) | |
6516c655 | 2075 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
2076 | --pos; |
2077 | return pos ? NULL : sk; | |
2078 | } | |
2079 | ||
2080 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
2081 | { | |
30842f29 | 2082 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 2083 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 2084 | |
b50660f1 | 2085 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
2086 | } |
2087 | ||
2088 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2089 | { | |
2090 | struct sock *sk; | |
2091 | ||
b50660f1 | 2092 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2093 | sk = udp_get_idx(seq, 0); |
2094 | else | |
2095 | sk = udp_get_next(seq, v); | |
2096 | ||
2097 | ++*pos; | |
2098 | return sk; | |
2099 | } | |
2100 | ||
2101 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
2102 | { | |
645ca708 ED |
2103 | struct udp_iter_state *state = seq->private; |
2104 | ||
f86dcc5a | 2105 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 2106 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
2107 | } |
2108 | ||
73cb88ec | 2109 | int udp_seq_open(struct inode *inode, struct file *file) |
1da177e4 | 2110 | { |
d9dda78b | 2111 | struct udp_seq_afinfo *afinfo = PDE_DATA(inode); |
a2be75c1 DL |
2112 | struct udp_iter_state *s; |
2113 | int err; | |
a91275ef | 2114 | |
a2be75c1 DL |
2115 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2116 | sizeof(struct udp_iter_state)); | |
2117 | if (err < 0) | |
2118 | return err; | |
a91275ef | 2119 | |
a2be75c1 | 2120 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2121 | s->family = afinfo->family; |
645ca708 | 2122 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 2123 | return err; |
a91275ef | 2124 | } |
73cb88ec | 2125 | EXPORT_SYMBOL(udp_seq_open); |
a91275ef | 2126 | |
1da177e4 | 2127 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 2128 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
2129 | { |
2130 | struct proc_dir_entry *p; | |
2131 | int rc = 0; | |
2132 | ||
dda61925 DL |
2133 | afinfo->seq_ops.start = udp_seq_start; |
2134 | afinfo->seq_ops.next = udp_seq_next; | |
2135 | afinfo->seq_ops.stop = udp_seq_stop; | |
2136 | ||
84841c3c | 2137 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2138 | afinfo->seq_fops, afinfo); |
84841c3c | 2139 | if (!p) |
1da177e4 LT |
2140 | rc = -ENOMEM; |
2141 | return rc; | |
2142 | } | |
c482c568 | 2143 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 2144 | |
0c96d8c5 | 2145 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 2146 | { |
ece31ffd | 2147 | remove_proc_entry(afinfo->name, net->proc_net); |
1da177e4 | 2148 | } |
c482c568 | 2149 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
2150 | |
2151 | /* ------------------------------------------------------------------------ */ | |
5e659e4c PE |
2152 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
2153 | int bucket, int *len) | |
db8dac20 DM |
2154 | { |
2155 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
2156 | __be32 dest = inet->inet_daddr; |
2157 | __be32 src = inet->inet_rcv_saddr; | |
2158 | __u16 destp = ntohs(inet->inet_dport); | |
2159 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 2160 | |
f86dcc5a | 2161 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
71338aa7 | 2162 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", |
db8dac20 | 2163 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
2164 | sk_wmem_alloc_get(sp), |
2165 | sk_rmem_alloc_get(sp), | |
a7cb5a49 EB |
2166 | 0, 0L, 0, |
2167 | from_kuid_munged(seq_user_ns(f), sock_i_uid(sp)), | |
2168 | 0, sock_i_ino(sp), | |
cb61cb9b ED |
2169 | atomic_read(&sp->sk_refcnt), sp, |
2170 | atomic_read(&sp->sk_drops), len); | |
db8dac20 DM |
2171 | } |
2172 | ||
2173 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2174 | { | |
2175 | if (v == SEQ_START_TOKEN) | |
2176 | seq_printf(seq, "%-127s\n", | |
2177 | " sl local_address rem_address st tx_queue " | |
2178 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 2179 | "inode ref pointer drops"); |
db8dac20 | 2180 | else { |
db8dac20 | 2181 | struct udp_iter_state *state = seq->private; |
5e659e4c | 2182 | int len; |
db8dac20 | 2183 | |
5e659e4c | 2184 | udp4_format_sock(v, seq, state->bucket, &len); |
c482c568 | 2185 | seq_printf(seq, "%*s\n", 127 - len, ""); |
db8dac20 DM |
2186 | } |
2187 | return 0; | |
2188 | } | |
2189 | ||
73cb88ec AV |
2190 | static const struct file_operations udp_afinfo_seq_fops = { |
2191 | .owner = THIS_MODULE, | |
2192 | .open = udp_seq_open, | |
2193 | .read = seq_read, | |
2194 | .llseek = seq_lseek, | |
2195 | .release = seq_release_net | |
2196 | }; | |
2197 | ||
db8dac20 | 2198 | /* ------------------------------------------------------------------------ */ |
db8dac20 | 2199 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2200 | .name = "udp", |
2201 | .family = AF_INET, | |
645ca708 | 2202 | .udp_table = &udp_table, |
73cb88ec | 2203 | .seq_fops = &udp_afinfo_seq_fops, |
dda61925 DL |
2204 | .seq_ops = { |
2205 | .show = udp4_seq_show, | |
2206 | }, | |
db8dac20 DM |
2207 | }; |
2208 | ||
2c8c1e72 | 2209 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2210 | { |
2211 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2212 | } | |
2213 | ||
2c8c1e72 | 2214 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2215 | { |
2216 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2217 | } | |
2218 | ||
2219 | static struct pernet_operations udp4_net_ops = { | |
2220 | .init = udp4_proc_init_net, | |
2221 | .exit = udp4_proc_exit_net, | |
2222 | }; | |
2223 | ||
db8dac20 DM |
2224 | int __init udp4_proc_init(void) |
2225 | { | |
15439feb | 2226 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2227 | } |
2228 | ||
2229 | void udp4_proc_exit(void) | |
2230 | { | |
15439feb | 2231 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2232 | } |
1da177e4 LT |
2233 | #endif /* CONFIG_PROC_FS */ |
2234 | ||
f86dcc5a ED |
2235 | static __initdata unsigned long uhash_entries; |
2236 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2237 | { |
413c27d8 EZ |
2238 | ssize_t ret; |
2239 | ||
f86dcc5a ED |
2240 | if (!str) |
2241 | return 0; | |
413c27d8 EZ |
2242 | |
2243 | ret = kstrtoul(str, 0, &uhash_entries); | |
2244 | if (ret) | |
2245 | return 0; | |
2246 | ||
f86dcc5a ED |
2247 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
2248 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2249 | return 1; | |
2250 | } | |
2251 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2252 | |
f86dcc5a ED |
2253 | void __init udp_table_init(struct udp_table *table, const char *name) |
2254 | { | |
2255 | unsigned int i; | |
2256 | ||
31fe62b9 TB |
2257 | table->hash = alloc_large_system_hash(name, |
2258 | 2 * sizeof(struct udp_hslot), | |
2259 | uhash_entries, | |
2260 | 21, /* one slot per 2 MB */ | |
2261 | 0, | |
2262 | &table->log, | |
2263 | &table->mask, | |
2264 | UDP_HTABLE_SIZE_MIN, | |
2265 | 64 * 1024); | |
2266 | ||
512615b6 | 2267 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2268 | for (i = 0; i <= table->mask; i++) { |
88ab1932 | 2269 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
fdcc8aa9 | 2270 | table->hash[i].count = 0; |
645ca708 ED |
2271 | spin_lock_init(&table->hash[i].lock); |
2272 | } | |
512615b6 ED |
2273 | for (i = 0; i <= table->mask; i++) { |
2274 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); | |
2275 | table->hash2[i].count = 0; | |
2276 | spin_lock_init(&table->hash2[i].lock); | |
2277 | } | |
645ca708 ED |
2278 | } |
2279 | ||
95766fff HA |
2280 | void __init udp_init(void) |
2281 | { | |
f03d78db | 2282 | unsigned long limit; |
95766fff | 2283 | |
f86dcc5a | 2284 | udp_table_init(&udp_table, "UDP"); |
f03d78db | 2285 | limit = nr_free_buffer_pages() / 8; |
95766fff HA |
2286 | limit = max(limit, 128UL); |
2287 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2288 | sysctl_udp_mem[1] = limit; | |
2289 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2290 | ||
2291 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2292 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
2293 | } | |
2294 | ||
da5bab07 DB |
2295 | struct sk_buff *skb_udp_tunnel_segment(struct sk_buff *skb, |
2296 | netdev_features_t features) | |
73136267 PS |
2297 | { |
2298 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
2299 | int mac_len = skb->mac_len; | |
2300 | int tnl_hlen = skb_inner_mac_header(skb) - skb_transport_header(skb); | |
0d05535d | 2301 | __be16 protocol = skb->protocol; |
73136267 | 2302 | netdev_features_t enc_features; |
0d05535d | 2303 | int outer_hlen; |
73136267 PS |
2304 | |
2305 | if (unlikely(!pskb_may_pull(skb, tnl_hlen))) | |
2306 | goto out; | |
2307 | ||
2308 | skb->encapsulation = 0; | |
2309 | __skb_pull(skb, tnl_hlen); | |
2310 | skb_reset_mac_header(skb); | |
2311 | skb_set_network_header(skb, skb_inner_network_offset(skb)); | |
2312 | skb->mac_len = skb_inner_network_offset(skb); | |
19acc327 | 2313 | skb->protocol = htons(ETH_P_TEB); |
73136267 PS |
2314 | |
2315 | /* segment inner packet. */ | |
2316 | enc_features = skb->dev->hw_enc_features & netif_skb_features(skb); | |
2317 | segs = skb_mac_gso_segment(skb, enc_features); | |
2318 | if (!segs || IS_ERR(segs)) | |
2319 | goto out; | |
2320 | ||
2321 | outer_hlen = skb_tnl_header_len(skb); | |
2322 | skb = segs; | |
2323 | do { | |
2324 | struct udphdr *uh; | |
2325 | int udp_offset = outer_hlen - tnl_hlen; | |
2326 | ||
cdbaa0bb AD |
2327 | skb_reset_inner_headers(skb); |
2328 | skb->encapsulation = 1; | |
2329 | ||
73136267 PS |
2330 | skb->mac_len = mac_len; |
2331 | ||
2332 | skb_push(skb, outer_hlen); | |
2333 | skb_reset_mac_header(skb); | |
2334 | skb_set_network_header(skb, mac_len); | |
2335 | skb_set_transport_header(skb, udp_offset); | |
2336 | uh = udp_hdr(skb); | |
2337 | uh->len = htons(skb->len - udp_offset); | |
2338 | ||
2339 | /* csum segment if tunnel sets skb with csum. */ | |
2340 | if (unlikely(uh->check)) { | |
2341 | struct iphdr *iph = ip_hdr(skb); | |
2342 | ||
2343 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, | |
2344 | skb->len - udp_offset, | |
2345 | IPPROTO_UDP, 0); | |
2346 | uh->check = csum_fold(skb_checksum(skb, udp_offset, | |
2347 | skb->len - udp_offset, 0)); | |
2348 | if (uh->check == 0) | |
2349 | uh->check = CSUM_MANGLED_0; | |
2350 | ||
2351 | } | |
0d05535d | 2352 | skb->protocol = protocol; |
73136267 PS |
2353 | } while ((skb = skb->next)); |
2354 | out: | |
2355 | return segs; | |
2356 | } |