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Commit | Line | Data |
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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> |
ba4e58ec | 112 | #include "udp_impl.h" |
1da177e4 | 113 | |
f86dcc5a | 114 | struct udp_table udp_table __read_mostly; |
645ca708 | 115 | EXPORT_SYMBOL(udp_table); |
1da177e4 | 116 | |
8d987e5c | 117 | long sysctl_udp_mem[3] __read_mostly; |
95766fff | 118 | EXPORT_SYMBOL(sysctl_udp_mem); |
c482c568 ED |
119 | |
120 | int sysctl_udp_rmem_min __read_mostly; | |
95766fff | 121 | EXPORT_SYMBOL(sysctl_udp_rmem_min); |
c482c568 ED |
122 | |
123 | int sysctl_udp_wmem_min __read_mostly; | |
95766fff HA |
124 | EXPORT_SYMBOL(sysctl_udp_wmem_min); |
125 | ||
8d987e5c | 126 | atomic_long_t udp_memory_allocated; |
95766fff HA |
127 | EXPORT_SYMBOL(udp_memory_allocated); |
128 | ||
f86dcc5a ED |
129 | #define MAX_UDP_PORTS 65536 |
130 | #define PORTS_PER_CHAIN (MAX_UDP_PORTS / UDP_HTABLE_SIZE_MIN) | |
98322f22 | 131 | |
f24d43c0 | 132 | static int udp_lib_lport_inuse(struct net *net, __u16 num, |
645ca708 | 133 | const struct udp_hslot *hslot, |
98322f22 | 134 | unsigned long *bitmap, |
f24d43c0 ED |
135 | struct sock *sk, |
136 | int (*saddr_comp)(const struct sock *sk1, | |
f86dcc5a ED |
137 | const struct sock *sk2), |
138 | unsigned int log) | |
1da177e4 | 139 | { |
f24d43c0 | 140 | struct sock *sk2; |
88ab1932 | 141 | struct hlist_nulls_node *node; |
25030a7f | 142 | |
88ab1932 | 143 | sk_nulls_for_each(sk2, node, &hslot->head) |
9d4fb27d JP |
144 | if (net_eq(sock_net(sk2), net) && |
145 | sk2 != sk && | |
d4cada4a | 146 | (bitmap || udp_sk(sk2)->udp_port_hash == num) && |
9d4fb27d JP |
147 | (!sk2->sk_reuse || !sk->sk_reuse) && |
148 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
149 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
98322f22 ED |
150 | (*saddr_comp)(sk, sk2)) { |
151 | if (bitmap) | |
d4cada4a ED |
152 | __set_bit(udp_sk(sk2)->udp_port_hash >> log, |
153 | bitmap); | |
98322f22 ED |
154 | else |
155 | return 1; | |
156 | } | |
25030a7f GR |
157 | return 0; |
158 | } | |
159 | ||
30fff923 ED |
160 | /* |
161 | * Note: we still hold spinlock of primary hash chain, so no other writer | |
162 | * can insert/delete a socket with local_port == num | |
163 | */ | |
164 | static int udp_lib_lport_inuse2(struct net *net, __u16 num, | |
165 | struct udp_hslot *hslot2, | |
166 | struct sock *sk, | |
167 | int (*saddr_comp)(const struct sock *sk1, | |
168 | const struct sock *sk2)) | |
169 | { | |
170 | struct sock *sk2; | |
171 | struct hlist_nulls_node *node; | |
172 | int res = 0; | |
173 | ||
174 | spin_lock(&hslot2->lock); | |
175 | udp_portaddr_for_each_entry(sk2, node, &hslot2->head) | |
9d4fb27d JP |
176 | if (net_eq(sock_net(sk2), net) && |
177 | sk2 != sk && | |
178 | (udp_sk(sk2)->udp_port_hash == num) && | |
179 | (!sk2->sk_reuse || !sk->sk_reuse) && | |
180 | (!sk2->sk_bound_dev_if || !sk->sk_bound_dev_if || | |
181 | sk2->sk_bound_dev_if == sk->sk_bound_dev_if) && | |
30fff923 ED |
182 | (*saddr_comp)(sk, sk2)) { |
183 | res = 1; | |
184 | break; | |
185 | } | |
186 | spin_unlock(&hslot2->lock); | |
187 | return res; | |
188 | } | |
189 | ||
25030a7f | 190 | /** |
6ba5a3c5 | 191 | * udp_lib_get_port - UDP/-Lite port lookup for IPv4 and IPv6 |
25030a7f GR |
192 | * |
193 | * @sk: socket struct in question | |
194 | * @snum: port number to look up | |
df2bc459 | 195 | * @saddr_comp: AF-dependent comparison of bound local IP addresses |
25985edc | 196 | * @hash2_nulladdr: AF-dependent hash value in secondary hash chains, |
30fff923 | 197 | * with NULL address |
25030a7f | 198 | */ |
6ba5a3c5 | 199 | int udp_lib_get_port(struct sock *sk, unsigned short snum, |
df2bc459 | 200 | int (*saddr_comp)(const struct sock *sk1, |
30fff923 ED |
201 | const struct sock *sk2), |
202 | unsigned int hash2_nulladdr) | |
25030a7f | 203 | { |
512615b6 | 204 | struct udp_hslot *hslot, *hslot2; |
645ca708 | 205 | struct udp_table *udptable = sk->sk_prot->h.udp_table; |
25030a7f | 206 | int error = 1; |
3b1e0a65 | 207 | struct net *net = sock_net(sk); |
1da177e4 | 208 | |
32c1da70 | 209 | if (!snum) { |
9088c560 | 210 | int low, high, remaining; |
95c96174 | 211 | unsigned int rand; |
98322f22 ED |
212 | unsigned short first, last; |
213 | DECLARE_BITMAP(bitmap, PORTS_PER_CHAIN); | |
32c1da70 | 214 | |
227b60f5 | 215 | inet_get_local_port_range(&low, &high); |
a25de534 | 216 | remaining = (high - low) + 1; |
227b60f5 | 217 | |
9088c560 | 218 | rand = net_random(); |
98322f22 ED |
219 | first = (((u64)rand * remaining) >> 32) + low; |
220 | /* | |
221 | * force rand to be an odd multiple of UDP_HTABLE_SIZE | |
222 | */ | |
f86dcc5a | 223 | rand = (rand | 1) * (udptable->mask + 1); |
5781b235 ED |
224 | last = first + udptable->mask + 1; |
225 | do { | |
f86dcc5a | 226 | hslot = udp_hashslot(udptable, net, first); |
98322f22 | 227 | bitmap_zero(bitmap, PORTS_PER_CHAIN); |
645ca708 | 228 | spin_lock_bh(&hslot->lock); |
98322f22 | 229 | udp_lib_lport_inuse(net, snum, hslot, bitmap, sk, |
f86dcc5a | 230 | saddr_comp, udptable->log); |
98322f22 ED |
231 | |
232 | snum = first; | |
233 | /* | |
234 | * Iterate on all possible values of snum for this hash. | |
235 | * Using steps of an odd multiple of UDP_HTABLE_SIZE | |
236 | * give us randomization and full range coverage. | |
237 | */ | |
9088c560 | 238 | do { |
98322f22 | 239 | if (low <= snum && snum <= high && |
e3826f1e AW |
240 | !test_bit(snum >> udptable->log, bitmap) && |
241 | !inet_is_reserved_local_port(snum)) | |
98322f22 ED |
242 | goto found; |
243 | snum += rand; | |
244 | } while (snum != first); | |
245 | spin_unlock_bh(&hslot->lock); | |
5781b235 | 246 | } while (++first != last); |
98322f22 | 247 | goto fail; |
645ca708 | 248 | } else { |
f86dcc5a | 249 | hslot = udp_hashslot(udptable, net, snum); |
645ca708 | 250 | spin_lock_bh(&hslot->lock); |
30fff923 ED |
251 | if (hslot->count > 10) { |
252 | int exist; | |
253 | unsigned int slot2 = udp_sk(sk)->udp_portaddr_hash ^ snum; | |
254 | ||
255 | slot2 &= udptable->mask; | |
256 | hash2_nulladdr &= udptable->mask; | |
257 | ||
258 | hslot2 = udp_hashslot2(udptable, slot2); | |
259 | if (hslot->count < hslot2->count) | |
260 | goto scan_primary_hash; | |
261 | ||
262 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
263 | sk, saddr_comp); | |
264 | if (!exist && (hash2_nulladdr != slot2)) { | |
265 | hslot2 = udp_hashslot2(udptable, hash2_nulladdr); | |
266 | exist = udp_lib_lport_inuse2(net, snum, hslot2, | |
267 | sk, saddr_comp); | |
268 | } | |
269 | if (exist) | |
270 | goto fail_unlock; | |
271 | else | |
272 | goto found; | |
273 | } | |
274 | scan_primary_hash: | |
f86dcc5a ED |
275 | if (udp_lib_lport_inuse(net, snum, hslot, NULL, sk, |
276 | saddr_comp, 0)) | |
645ca708 ED |
277 | goto fail_unlock; |
278 | } | |
98322f22 | 279 | found: |
c720c7e8 | 280 | inet_sk(sk)->inet_num = snum; |
d4cada4a ED |
281 | udp_sk(sk)->udp_port_hash = snum; |
282 | udp_sk(sk)->udp_portaddr_hash ^= snum; | |
1da177e4 | 283 | if (sk_unhashed(sk)) { |
88ab1932 | 284 | sk_nulls_add_node_rcu(sk, &hslot->head); |
fdcc8aa9 | 285 | hslot->count++; |
c29a0bc4 | 286 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, 1); |
512615b6 ED |
287 | |
288 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
289 | spin_lock(&hslot2->lock); | |
290 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
291 | &hslot2->head); | |
292 | hslot2->count++; | |
293 | spin_unlock(&hslot2->lock); | |
1da177e4 | 294 | } |
25030a7f | 295 | error = 0; |
645ca708 ED |
296 | fail_unlock: |
297 | spin_unlock_bh(&hslot->lock); | |
1da177e4 | 298 | fail: |
25030a7f GR |
299 | return error; |
300 | } | |
c482c568 | 301 | EXPORT_SYMBOL(udp_lib_get_port); |
25030a7f | 302 | |
499923c7 | 303 | static int ipv4_rcv_saddr_equal(const struct sock *sk1, const struct sock *sk2) |
db8dac20 DM |
304 | { |
305 | struct inet_sock *inet1 = inet_sk(sk1), *inet2 = inet_sk(sk2); | |
306 | ||
c482c568 | 307 | return (!ipv6_only_sock(sk2) && |
c720c7e8 ED |
308 | (!inet1->inet_rcv_saddr || !inet2->inet_rcv_saddr || |
309 | inet1->inet_rcv_saddr == inet2->inet_rcv_saddr)); | |
db8dac20 DM |
310 | } |
311 | ||
d4cada4a ED |
312 | static unsigned int udp4_portaddr_hash(struct net *net, __be32 saddr, |
313 | unsigned int port) | |
314 | { | |
0eae88f3 | 315 | return jhash_1word((__force u32)saddr, net_hash_mix(net)) ^ port; |
d4cada4a ED |
316 | } |
317 | ||
6ba5a3c5 | 318 | int udp_v4_get_port(struct sock *sk, unsigned short snum) |
db8dac20 | 319 | { |
30fff923 | 320 | unsigned int hash2_nulladdr = |
0eae88f3 | 321 | udp4_portaddr_hash(sock_net(sk), htonl(INADDR_ANY), snum); |
30fff923 ED |
322 | unsigned int hash2_partial = |
323 | udp4_portaddr_hash(sock_net(sk), inet_sk(sk)->inet_rcv_saddr, 0); | |
324 | ||
d4cada4a | 325 | /* precompute partial secondary hash */ |
30fff923 ED |
326 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
327 | return udp_lib_get_port(sk, snum, ipv4_rcv_saddr_equal, hash2_nulladdr); | |
db8dac20 DM |
328 | } |
329 | ||
645ca708 ED |
330 | static inline int compute_score(struct sock *sk, struct net *net, __be32 saddr, |
331 | unsigned short hnum, | |
332 | __be16 sport, __be32 daddr, __be16 dport, int dif) | |
333 | { | |
334 | int score = -1; | |
335 | ||
d4cada4a | 336 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
337 | !ipv6_only_sock(sk)) { |
338 | struct inet_sock *inet = inet_sk(sk); | |
339 | ||
340 | score = (sk->sk_family == PF_INET ? 1 : 0); | |
c720c7e8 ED |
341 | if (inet->inet_rcv_saddr) { |
342 | if (inet->inet_rcv_saddr != daddr) | |
645ca708 ED |
343 | return -1; |
344 | score += 2; | |
345 | } | |
c720c7e8 ED |
346 | if (inet->inet_daddr) { |
347 | if (inet->inet_daddr != saddr) | |
645ca708 ED |
348 | return -1; |
349 | score += 2; | |
350 | } | |
c720c7e8 ED |
351 | if (inet->inet_dport) { |
352 | if (inet->inet_dport != sport) | |
645ca708 ED |
353 | return -1; |
354 | score += 2; | |
355 | } | |
356 | if (sk->sk_bound_dev_if) { | |
357 | if (sk->sk_bound_dev_if != dif) | |
358 | return -1; | |
359 | score += 2; | |
360 | } | |
361 | } | |
362 | return score; | |
363 | } | |
364 | ||
5051ebd2 ED |
365 | /* |
366 | * In this second variant, we check (daddr, dport) matches (inet_rcv_sadd, inet_num) | |
367 | */ | |
368 | #define SCORE2_MAX (1 + 2 + 2 + 2) | |
369 | static inline int compute_score2(struct sock *sk, struct net *net, | |
370 | __be32 saddr, __be16 sport, | |
371 | __be32 daddr, unsigned int hnum, int dif) | |
372 | { | |
373 | int score = -1; | |
374 | ||
375 | if (net_eq(sock_net(sk), net) && !ipv6_only_sock(sk)) { | |
376 | struct inet_sock *inet = inet_sk(sk); | |
377 | ||
378 | if (inet->inet_rcv_saddr != daddr) | |
379 | return -1; | |
380 | if (inet->inet_num != hnum) | |
381 | return -1; | |
382 | ||
383 | score = (sk->sk_family == PF_INET ? 1 : 0); | |
384 | if (inet->inet_daddr) { | |
385 | if (inet->inet_daddr != saddr) | |
386 | return -1; | |
387 | score += 2; | |
388 | } | |
389 | if (inet->inet_dport) { | |
390 | if (inet->inet_dport != sport) | |
391 | return -1; | |
392 | score += 2; | |
393 | } | |
394 | if (sk->sk_bound_dev_if) { | |
395 | if (sk->sk_bound_dev_if != dif) | |
396 | return -1; | |
397 | score += 2; | |
398 | } | |
399 | } | |
400 | return score; | |
401 | } | |
402 | ||
5051ebd2 ED |
403 | |
404 | /* called with read_rcu_lock() */ | |
405 | static struct sock *udp4_lib_lookup2(struct net *net, | |
406 | __be32 saddr, __be16 sport, | |
407 | __be32 daddr, unsigned int hnum, int dif, | |
408 | struct udp_hslot *hslot2, unsigned int slot2) | |
409 | { | |
410 | struct sock *sk, *result; | |
411 | struct hlist_nulls_node *node; | |
412 | int score, badness; | |
413 | ||
414 | begin: | |
415 | result = NULL; | |
416 | badness = -1; | |
417 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
418 | score = compute_score2(sk, net, saddr, sport, | |
419 | daddr, hnum, dif); | |
420 | if (score > badness) { | |
421 | result = sk; | |
422 | badness = score; | |
423 | if (score == SCORE2_MAX) | |
424 | goto exact_match; | |
425 | } | |
426 | } | |
427 | /* | |
428 | * if the nulls value we got at the end of this lookup is | |
429 | * not the expected one, we must restart lookup. | |
430 | * We probably met an item that was moved to another chain. | |
431 | */ | |
432 | if (get_nulls_value(node) != slot2) | |
433 | goto begin; | |
434 | ||
435 | if (result) { | |
436 | exact_match: | |
c31504dc | 437 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
5051ebd2 ED |
438 | result = NULL; |
439 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
440 | daddr, hnum, dif) < badness)) { | |
441 | sock_put(result); | |
442 | goto begin; | |
443 | } | |
444 | } | |
445 | return result; | |
446 | } | |
447 | ||
db8dac20 DM |
448 | /* UDP is nearly always wildcards out the wazoo, it makes no sense to try |
449 | * harder than this. -DaveM | |
450 | */ | |
fce82338 | 451 | struct sock *__udp4_lib_lookup(struct net *net, __be32 saddr, |
db8dac20 | 452 | __be16 sport, __be32 daddr, __be16 dport, |
645ca708 | 453 | int dif, struct udp_table *udptable) |
db8dac20 | 454 | { |
271b72c7 | 455 | struct sock *sk, *result; |
88ab1932 | 456 | struct hlist_nulls_node *node; |
db8dac20 | 457 | unsigned short hnum = ntohs(dport); |
5051ebd2 ED |
458 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
459 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
271b72c7 | 460 | int score, badness; |
645ca708 | 461 | |
271b72c7 | 462 | rcu_read_lock(); |
5051ebd2 ED |
463 | if (hslot->count > 10) { |
464 | hash2 = udp4_portaddr_hash(net, daddr, hnum); | |
465 | slot2 = hash2 & udptable->mask; | |
466 | hslot2 = &udptable->hash2[slot2]; | |
467 | if (hslot->count < hslot2->count) | |
468 | goto begin; | |
469 | ||
470 | result = udp4_lib_lookup2(net, saddr, sport, | |
471 | daddr, hnum, dif, | |
472 | hslot2, slot2); | |
473 | if (!result) { | |
0eae88f3 | 474 | hash2 = udp4_portaddr_hash(net, htonl(INADDR_ANY), hnum); |
5051ebd2 ED |
475 | slot2 = hash2 & udptable->mask; |
476 | hslot2 = &udptable->hash2[slot2]; | |
477 | if (hslot->count < hslot2->count) | |
478 | goto begin; | |
479 | ||
1223c67c | 480 | result = udp4_lib_lookup2(net, saddr, sport, |
0eae88f3 | 481 | htonl(INADDR_ANY), hnum, dif, |
5051ebd2 ED |
482 | hslot2, slot2); |
483 | } | |
484 | rcu_read_unlock(); | |
485 | return result; | |
486 | } | |
271b72c7 ED |
487 | begin: |
488 | result = NULL; | |
489 | badness = -1; | |
88ab1932 | 490 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
491 | score = compute_score(sk, net, saddr, hnum, sport, |
492 | daddr, dport, dif); | |
493 | if (score > badness) { | |
494 | result = sk; | |
495 | badness = score; | |
db8dac20 DM |
496 | } |
497 | } | |
88ab1932 ED |
498 | /* |
499 | * if the nulls value we got at the end of this lookup is | |
500 | * not the expected one, we must restart lookup. | |
501 | * We probably met an item that was moved to another chain. | |
502 | */ | |
5051ebd2 | 503 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
504 | goto begin; |
505 | ||
271b72c7 | 506 | if (result) { |
c31504dc | 507 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
508 | result = NULL; |
509 | else if (unlikely(compute_score(result, net, saddr, hnum, sport, | |
510 | daddr, dport, dif) < badness)) { | |
511 | sock_put(result); | |
512 | goto begin; | |
513 | } | |
514 | } | |
515 | rcu_read_unlock(); | |
db8dac20 DM |
516 | return result; |
517 | } | |
fce82338 | 518 | EXPORT_SYMBOL_GPL(__udp4_lib_lookup); |
db8dac20 | 519 | |
607c4aaf KK |
520 | static inline struct sock *__udp4_lib_lookup_skb(struct sk_buff *skb, |
521 | __be16 sport, __be16 dport, | |
645ca708 | 522 | struct udp_table *udptable) |
607c4aaf | 523 | { |
23542618 | 524 | struct sock *sk; |
607c4aaf KK |
525 | const struct iphdr *iph = ip_hdr(skb); |
526 | ||
23542618 KK |
527 | if (unlikely(sk = skb_steal_sock(skb))) |
528 | return sk; | |
529 | else | |
adf30907 | 530 | return __udp4_lib_lookup(dev_net(skb_dst(skb)->dev), iph->saddr, sport, |
23542618 KK |
531 | iph->daddr, dport, inet_iif(skb), |
532 | udptable); | |
607c4aaf KK |
533 | } |
534 | ||
bcd41303 KK |
535 | struct sock *udp4_lib_lookup(struct net *net, __be32 saddr, __be16 sport, |
536 | __be32 daddr, __be16 dport, int dif) | |
537 | { | |
645ca708 | 538 | return __udp4_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); |
bcd41303 KK |
539 | } |
540 | EXPORT_SYMBOL_GPL(udp4_lib_lookup); | |
541 | ||
920a4611 | 542 | static inline struct sock *udp_v4_mcast_next(struct net *net, struct sock *sk, |
db8dac20 DM |
543 | __be16 loc_port, __be32 loc_addr, |
544 | __be16 rmt_port, __be32 rmt_addr, | |
545 | int dif) | |
546 | { | |
88ab1932 | 547 | struct hlist_nulls_node *node; |
db8dac20 DM |
548 | struct sock *s = sk; |
549 | unsigned short hnum = ntohs(loc_port); | |
550 | ||
88ab1932 | 551 | sk_nulls_for_each_from(s, node) { |
db8dac20 DM |
552 | struct inet_sock *inet = inet_sk(s); |
553 | ||
9d4fb27d JP |
554 | if (!net_eq(sock_net(s), net) || |
555 | udp_sk(s)->udp_port_hash != hnum || | |
556 | (inet->inet_daddr && inet->inet_daddr != rmt_addr) || | |
557 | (inet->inet_dport != rmt_port && inet->inet_dport) || | |
558 | (inet->inet_rcv_saddr && | |
559 | inet->inet_rcv_saddr != loc_addr) || | |
560 | ipv6_only_sock(s) || | |
db8dac20 DM |
561 | (s->sk_bound_dev_if && s->sk_bound_dev_if != dif)) |
562 | continue; | |
563 | if (!ip_mc_sf_allow(s, loc_addr, rmt_addr, dif)) | |
564 | continue; | |
565 | goto found; | |
566 | } | |
567 | s = NULL; | |
568 | found: | |
569 | return s; | |
570 | } | |
571 | ||
572 | /* | |
573 | * This routine is called by the ICMP module when it gets some | |
574 | * sort of error condition. If err < 0 then the socket should | |
575 | * be closed and the error returned to the user. If err > 0 | |
576 | * it's just the icmp type << 8 | icmp code. | |
577 | * Header points to the ip header of the error packet. We move | |
578 | * on past this. Then (as it used to claim before adjustment) | |
579 | * header points to the first 8 bytes of the udp header. We need | |
580 | * to find the appropriate port. | |
581 | */ | |
582 | ||
645ca708 | 583 | void __udp4_lib_err(struct sk_buff *skb, u32 info, struct udp_table *udptable) |
db8dac20 DM |
584 | { |
585 | struct inet_sock *inet; | |
b71d1d42 | 586 | const struct iphdr *iph = (const struct iphdr *)skb->data; |
c482c568 | 587 | struct udphdr *uh = (struct udphdr *)(skb->data+(iph->ihl<<2)); |
db8dac20 DM |
588 | const int type = icmp_hdr(skb)->type; |
589 | const int code = icmp_hdr(skb)->code; | |
590 | struct sock *sk; | |
591 | int harderr; | |
592 | int err; | |
fd54d716 | 593 | struct net *net = dev_net(skb->dev); |
db8dac20 | 594 | |
fd54d716 | 595 | sk = __udp4_lib_lookup(net, iph->daddr, uh->dest, |
db8dac20 DM |
596 | iph->saddr, uh->source, skb->dev->ifindex, udptable); |
597 | if (sk == NULL) { | |
dcfc23ca | 598 | ICMP_INC_STATS_BH(net, ICMP_MIB_INERRORS); |
db8dac20 DM |
599 | return; /* No socket for error */ |
600 | } | |
601 | ||
602 | err = 0; | |
603 | harderr = 0; | |
604 | inet = inet_sk(sk); | |
605 | ||
606 | switch (type) { | |
607 | default: | |
608 | case ICMP_TIME_EXCEEDED: | |
609 | err = EHOSTUNREACH; | |
610 | break; | |
611 | case ICMP_SOURCE_QUENCH: | |
612 | goto out; | |
613 | case ICMP_PARAMETERPROB: | |
614 | err = EPROTO; | |
615 | harderr = 1; | |
616 | break; | |
617 | case ICMP_DEST_UNREACH: | |
618 | if (code == ICMP_FRAG_NEEDED) { /* Path MTU discovery */ | |
36393395 | 619 | ipv4_sk_update_pmtu(skb, sk, info); |
db8dac20 DM |
620 | if (inet->pmtudisc != IP_PMTUDISC_DONT) { |
621 | err = EMSGSIZE; | |
622 | harderr = 1; | |
623 | break; | |
624 | } | |
625 | goto out; | |
626 | } | |
627 | err = EHOSTUNREACH; | |
628 | if (code <= NR_ICMP_UNREACH) { | |
629 | harderr = icmp_err_convert[code].fatal; | |
630 | err = icmp_err_convert[code].errno; | |
631 | } | |
632 | break; | |
633 | } | |
634 | ||
635 | /* | |
636 | * RFC1122: OK. Passes ICMP errors back to application, as per | |
637 | * 4.1.3.3. | |
638 | */ | |
639 | if (!inet->recverr) { | |
640 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
641 | goto out; | |
b1faf566 | 642 | } else |
c482c568 | 643 | ip_icmp_error(sk, skb, err, uh->dest, info, (u8 *)(uh+1)); |
b1faf566 | 644 | |
db8dac20 DM |
645 | sk->sk_err = err; |
646 | sk->sk_error_report(sk); | |
647 | out: | |
648 | sock_put(sk); | |
649 | } | |
650 | ||
651 | void udp_err(struct sk_buff *skb, u32 info) | |
652 | { | |
645ca708 | 653 | __udp4_lib_err(skb, info, &udp_table); |
db8dac20 DM |
654 | } |
655 | ||
656 | /* | |
657 | * Throw away all pending data and cancel the corking. Socket is locked. | |
658 | */ | |
36d926b9 | 659 | void udp_flush_pending_frames(struct sock *sk) |
db8dac20 DM |
660 | { |
661 | struct udp_sock *up = udp_sk(sk); | |
662 | ||
663 | if (up->pending) { | |
664 | up->len = 0; | |
665 | up->pending = 0; | |
666 | ip_flush_pending_frames(sk); | |
667 | } | |
668 | } | |
36d926b9 | 669 | EXPORT_SYMBOL(udp_flush_pending_frames); |
db8dac20 DM |
670 | |
671 | /** | |
f6b9664f | 672 | * udp4_hwcsum - handle outgoing HW checksumming |
db8dac20 DM |
673 | * @skb: sk_buff containing the filled-in UDP header |
674 | * (checksum field must be zeroed out) | |
f6b9664f HX |
675 | * @src: source IP address |
676 | * @dst: destination IP address | |
db8dac20 | 677 | */ |
f6b9664f | 678 | static void udp4_hwcsum(struct sk_buff *skb, __be32 src, __be32 dst) |
db8dac20 | 679 | { |
db8dac20 | 680 | struct udphdr *uh = udp_hdr(skb); |
f6b9664f HX |
681 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
682 | int offset = skb_transport_offset(skb); | |
683 | int len = skb->len - offset; | |
684 | int hlen = len; | |
db8dac20 DM |
685 | __wsum csum = 0; |
686 | ||
f6b9664f | 687 | if (!frags) { |
db8dac20 DM |
688 | /* |
689 | * Only one fragment on the socket. | |
690 | */ | |
691 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
692 | skb->csum_offset = offsetof(struct udphdr, check); | |
f6b9664f HX |
693 | uh->check = ~csum_tcpudp_magic(src, dst, len, |
694 | IPPROTO_UDP, 0); | |
db8dac20 DM |
695 | } else { |
696 | /* | |
697 | * HW-checksum won't work as there are two or more | |
698 | * fragments on the socket so that all csums of sk_buffs | |
699 | * should be together | |
700 | */ | |
f6b9664f HX |
701 | do { |
702 | csum = csum_add(csum, frags->csum); | |
703 | hlen -= frags->len; | |
704 | } while ((frags = frags->next)); | |
db8dac20 | 705 | |
f6b9664f | 706 | csum = skb_checksum(skb, offset, hlen, csum); |
db8dac20 DM |
707 | skb->ip_summed = CHECKSUM_NONE; |
708 | ||
db8dac20 DM |
709 | uh->check = csum_tcpudp_magic(src, dst, len, IPPROTO_UDP, csum); |
710 | if (uh->check == 0) | |
711 | uh->check = CSUM_MANGLED_0; | |
712 | } | |
713 | } | |
714 | ||
79ab0531 | 715 | static int udp_send_skb(struct sk_buff *skb, struct flowi4 *fl4) |
db8dac20 | 716 | { |
f6b9664f | 717 | struct sock *sk = skb->sk; |
db8dac20 | 718 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
719 | struct udphdr *uh; |
720 | int err = 0; | |
721 | int is_udplite = IS_UDPLITE(sk); | |
f6b9664f HX |
722 | int offset = skb_transport_offset(skb); |
723 | int len = skb->len - offset; | |
db8dac20 DM |
724 | __wsum csum = 0; |
725 | ||
db8dac20 DM |
726 | /* |
727 | * Create a UDP header | |
728 | */ | |
729 | uh = udp_hdr(skb); | |
f6b9664f | 730 | uh->source = inet->inet_sport; |
79ab0531 | 731 | uh->dest = fl4->fl4_dport; |
f6b9664f | 732 | uh->len = htons(len); |
db8dac20 DM |
733 | uh->check = 0; |
734 | ||
735 | if (is_udplite) /* UDP-Lite */ | |
f6b9664f | 736 | csum = udplite_csum(skb); |
db8dac20 DM |
737 | |
738 | else if (sk->sk_no_check == UDP_CSUM_NOXMIT) { /* UDP csum disabled */ | |
739 | ||
740 | skb->ip_summed = CHECKSUM_NONE; | |
741 | goto send; | |
742 | ||
743 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
744 | ||
79ab0531 | 745 | udp4_hwcsum(skb, fl4->saddr, fl4->daddr); |
db8dac20 DM |
746 | goto send; |
747 | ||
f6b9664f HX |
748 | } else |
749 | csum = udp_csum(skb); | |
db8dac20 DM |
750 | |
751 | /* add protocol-dependent pseudo-header */ | |
79ab0531 | 752 | uh->check = csum_tcpudp_magic(fl4->saddr, fl4->daddr, len, |
c482c568 | 753 | sk->sk_protocol, csum); |
db8dac20 DM |
754 | if (uh->check == 0) |
755 | uh->check = CSUM_MANGLED_0; | |
756 | ||
757 | send: | |
f6b9664f | 758 | err = ip_send_skb(skb); |
6ce9e7b5 ED |
759 | if (err) { |
760 | if (err == -ENOBUFS && !inet->recverr) { | |
761 | UDP_INC_STATS_USER(sock_net(sk), | |
762 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
763 | err = 0; | |
764 | } | |
765 | } else | |
766 | UDP_INC_STATS_USER(sock_net(sk), | |
767 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
f6b9664f HX |
768 | return err; |
769 | } | |
770 | ||
771 | /* | |
772 | * Push out all pending data as one UDP datagram. Socket is locked. | |
773 | */ | |
774 | static int udp_push_pending_frames(struct sock *sk) | |
775 | { | |
776 | struct udp_sock *up = udp_sk(sk); | |
777 | struct inet_sock *inet = inet_sk(sk); | |
b6f21b26 | 778 | struct flowi4 *fl4 = &inet->cork.fl.u.ip4; |
f6b9664f HX |
779 | struct sk_buff *skb; |
780 | int err = 0; | |
781 | ||
77968b78 | 782 | skb = ip_finish_skb(sk, fl4); |
f6b9664f HX |
783 | if (!skb) |
784 | goto out; | |
785 | ||
79ab0531 | 786 | err = udp_send_skb(skb, fl4); |
f6b9664f | 787 | |
db8dac20 DM |
788 | out: |
789 | up->len = 0; | |
790 | up->pending = 0; | |
db8dac20 DM |
791 | return err; |
792 | } | |
793 | ||
794 | int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
795 | size_t len) | |
796 | { | |
797 | struct inet_sock *inet = inet_sk(sk); | |
798 | struct udp_sock *up = udp_sk(sk); | |
e474995f | 799 | struct flowi4 fl4_stack; |
b6f21b26 | 800 | struct flowi4 *fl4; |
db8dac20 DM |
801 | int ulen = len; |
802 | struct ipcm_cookie ipc; | |
803 | struct rtable *rt = NULL; | |
804 | int free = 0; | |
805 | int connected = 0; | |
806 | __be32 daddr, faddr, saddr; | |
807 | __be16 dport; | |
808 | u8 tos; | |
809 | int err, is_udplite = IS_UDPLITE(sk); | |
810 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; | |
811 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); | |
903ab86d | 812 | struct sk_buff *skb; |
f6d8bd05 | 813 | struct ip_options_data opt_copy; |
db8dac20 DM |
814 | |
815 | if (len > 0xFFFF) | |
816 | return -EMSGSIZE; | |
817 | ||
818 | /* | |
819 | * Check the flags. | |
820 | */ | |
821 | ||
c482c568 | 822 | if (msg->msg_flags & MSG_OOB) /* Mirror BSD error message compatibility */ |
db8dac20 DM |
823 | return -EOPNOTSUPP; |
824 | ||
825 | ipc.opt = NULL; | |
2244d07b | 826 | ipc.tx_flags = 0; |
db8dac20 | 827 | |
903ab86d HX |
828 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
829 | ||
f5fca608 | 830 | fl4 = &inet->cork.fl.u.ip4; |
db8dac20 DM |
831 | if (up->pending) { |
832 | /* | |
833 | * There are pending frames. | |
834 | * The socket lock must be held while it's corked. | |
835 | */ | |
836 | lock_sock(sk); | |
837 | if (likely(up->pending)) { | |
838 | if (unlikely(up->pending != AF_INET)) { | |
839 | release_sock(sk); | |
840 | return -EINVAL; | |
841 | } | |
842 | goto do_append_data; | |
843 | } | |
844 | release_sock(sk); | |
845 | } | |
846 | ulen += sizeof(struct udphdr); | |
847 | ||
848 | /* | |
849 | * Get and verify the address. | |
850 | */ | |
851 | if (msg->msg_name) { | |
5e73ea1a | 852 | struct sockaddr_in *usin = (struct sockaddr_in *)msg->msg_name; |
db8dac20 DM |
853 | if (msg->msg_namelen < sizeof(*usin)) |
854 | return -EINVAL; | |
855 | if (usin->sin_family != AF_INET) { | |
856 | if (usin->sin_family != AF_UNSPEC) | |
857 | return -EAFNOSUPPORT; | |
858 | } | |
859 | ||
860 | daddr = usin->sin_addr.s_addr; | |
861 | dport = usin->sin_port; | |
862 | if (dport == 0) | |
863 | return -EINVAL; | |
864 | } else { | |
865 | if (sk->sk_state != TCP_ESTABLISHED) | |
866 | return -EDESTADDRREQ; | |
c720c7e8 ED |
867 | daddr = inet->inet_daddr; |
868 | dport = inet->inet_dport; | |
db8dac20 DM |
869 | /* Open fast path for connected socket. |
870 | Route will not be used, if at least one option is set. | |
871 | */ | |
872 | connected = 1; | |
873 | } | |
c720c7e8 | 874 | ipc.addr = inet->inet_saddr; |
db8dac20 DM |
875 | |
876 | ipc.oif = sk->sk_bound_dev_if; | |
2244d07b | 877 | err = sock_tx_timestamp(sk, &ipc.tx_flags); |
51f31cab PO |
878 | if (err) |
879 | return err; | |
db8dac20 | 880 | if (msg->msg_controllen) { |
3b1e0a65 | 881 | err = ip_cmsg_send(sock_net(sk), msg, &ipc); |
db8dac20 DM |
882 | if (err) |
883 | return err; | |
884 | if (ipc.opt) | |
885 | free = 1; | |
886 | connected = 0; | |
887 | } | |
f6d8bd05 ED |
888 | if (!ipc.opt) { |
889 | struct ip_options_rcu *inet_opt; | |
890 | ||
891 | rcu_read_lock(); | |
892 | inet_opt = rcu_dereference(inet->inet_opt); | |
893 | if (inet_opt) { | |
894 | memcpy(&opt_copy, inet_opt, | |
895 | sizeof(*inet_opt) + inet_opt->opt.optlen); | |
896 | ipc.opt = &opt_copy.opt; | |
897 | } | |
898 | rcu_read_unlock(); | |
899 | } | |
db8dac20 DM |
900 | |
901 | saddr = ipc.addr; | |
902 | ipc.addr = faddr = daddr; | |
903 | ||
f6d8bd05 | 904 | if (ipc.opt && ipc.opt->opt.srr) { |
db8dac20 DM |
905 | if (!daddr) |
906 | return -EINVAL; | |
f6d8bd05 | 907 | faddr = ipc.opt->opt.faddr; |
db8dac20 DM |
908 | connected = 0; |
909 | } | |
910 | tos = RT_TOS(inet->tos); | |
911 | if (sock_flag(sk, SOCK_LOCALROUTE) || | |
912 | (msg->msg_flags & MSG_DONTROUTE) || | |
f6d8bd05 | 913 | (ipc.opt && ipc.opt->opt.is_strictroute)) { |
db8dac20 DM |
914 | tos |= RTO_ONLINK; |
915 | connected = 0; | |
916 | } | |
917 | ||
918 | if (ipv4_is_multicast(daddr)) { | |
919 | if (!ipc.oif) | |
920 | ipc.oif = inet->mc_index; | |
921 | if (!saddr) | |
922 | saddr = inet->mc_addr; | |
923 | connected = 0; | |
76e21053 EH |
924 | } else if (!ipc.oif) |
925 | ipc.oif = inet->uc_index; | |
db8dac20 DM |
926 | |
927 | if (connected) | |
c482c568 | 928 | rt = (struct rtable *)sk_dst_check(sk, 0); |
db8dac20 DM |
929 | |
930 | if (rt == NULL) { | |
84a3aa00 PE |
931 | struct net *net = sock_net(sk); |
932 | ||
e474995f DM |
933 | fl4 = &fl4_stack; |
934 | flowi4_init_output(fl4, ipc.oif, sk->sk_mark, tos, | |
c0951cbc DM |
935 | RT_SCOPE_UNIVERSE, sk->sk_protocol, |
936 | inet_sk_flowi_flags(sk)|FLOWI_FLAG_CAN_SLEEP, | |
937 | faddr, saddr, dport, inet->inet_sport); | |
938 | ||
e474995f DM |
939 | security_sk_classify_flow(sk, flowi4_to_flowi(fl4)); |
940 | rt = ip_route_output_flow(net, fl4, sk); | |
b23dd4fe DM |
941 | if (IS_ERR(rt)) { |
942 | err = PTR_ERR(rt); | |
06dc94b1 | 943 | rt = NULL; |
db8dac20 | 944 | if (err == -ENETUNREACH) |
7c73a6fa | 945 | IP_INC_STATS_BH(net, IPSTATS_MIB_OUTNOROUTES); |
db8dac20 DM |
946 | goto out; |
947 | } | |
948 | ||
949 | err = -EACCES; | |
950 | if ((rt->rt_flags & RTCF_BROADCAST) && | |
951 | !sock_flag(sk, SOCK_BROADCAST)) | |
952 | goto out; | |
953 | if (connected) | |
d8d1f30b | 954 | sk_dst_set(sk, dst_clone(&rt->dst)); |
db8dac20 DM |
955 | } |
956 | ||
957 | if (msg->msg_flags&MSG_CONFIRM) | |
958 | goto do_confirm; | |
959 | back_from_confirm: | |
960 | ||
e474995f | 961 | saddr = fl4->saddr; |
db8dac20 | 962 | if (!ipc.addr) |
e474995f | 963 | daddr = ipc.addr = fl4->daddr; |
db8dac20 | 964 | |
903ab86d HX |
965 | /* Lockless fast path for the non-corking case. */ |
966 | if (!corkreq) { | |
77968b78 | 967 | skb = ip_make_skb(sk, fl4, getfrag, msg->msg_iov, ulen, |
903ab86d HX |
968 | sizeof(struct udphdr), &ipc, &rt, |
969 | msg->msg_flags); | |
970 | err = PTR_ERR(skb); | |
971 | if (skb && !IS_ERR(skb)) | |
79ab0531 | 972 | err = udp_send_skb(skb, fl4); |
903ab86d HX |
973 | goto out; |
974 | } | |
975 | ||
db8dac20 DM |
976 | lock_sock(sk); |
977 | if (unlikely(up->pending)) { | |
978 | /* The socket is already corked while preparing it. */ | |
979 | /* ... which is an evident application bug. --ANK */ | |
980 | release_sock(sk); | |
981 | ||
afd46503 | 982 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("cork app bug 2\n")); |
db8dac20 DM |
983 | err = -EINVAL; |
984 | goto out; | |
985 | } | |
986 | /* | |
987 | * Now cork the socket to pend data. | |
988 | */ | |
b6f21b26 DM |
989 | fl4 = &inet->cork.fl.u.ip4; |
990 | fl4->daddr = daddr; | |
991 | fl4->saddr = saddr; | |
9cce96df DM |
992 | fl4->fl4_dport = dport; |
993 | fl4->fl4_sport = inet->inet_sport; | |
db8dac20 DM |
994 | up->pending = AF_INET; |
995 | ||
996 | do_append_data: | |
997 | up->len += ulen; | |
f5fca608 DM |
998 | err = ip_append_data(sk, fl4, getfrag, msg->msg_iov, ulen, |
999 | sizeof(struct udphdr), &ipc, &rt, | |
1000 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
db8dac20 DM |
1001 | if (err) |
1002 | udp_flush_pending_frames(sk); | |
1003 | else if (!corkreq) | |
1004 | err = udp_push_pending_frames(sk); | |
1005 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) | |
1006 | up->pending = 0; | |
1007 | release_sock(sk); | |
1008 | ||
1009 | out: | |
1010 | ip_rt_put(rt); | |
1011 | if (free) | |
1012 | kfree(ipc.opt); | |
1013 | if (!err) | |
1014 | return len; | |
1015 | /* | |
1016 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1017 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1018 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1019 | * things). We could add another new stat but at least for now that | |
1020 | * seems like overkill. | |
1021 | */ | |
1022 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
629ca23c PE |
1023 | UDP_INC_STATS_USER(sock_net(sk), |
1024 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
db8dac20 DM |
1025 | } |
1026 | return err; | |
1027 | ||
1028 | do_confirm: | |
d8d1f30b | 1029 | dst_confirm(&rt->dst); |
db8dac20 DM |
1030 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1031 | goto back_from_confirm; | |
1032 | err = 0; | |
1033 | goto out; | |
1034 | } | |
c482c568 | 1035 | EXPORT_SYMBOL(udp_sendmsg); |
db8dac20 DM |
1036 | |
1037 | int udp_sendpage(struct sock *sk, struct page *page, int offset, | |
1038 | size_t size, int flags) | |
1039 | { | |
f5fca608 | 1040 | struct inet_sock *inet = inet_sk(sk); |
db8dac20 DM |
1041 | struct udp_sock *up = udp_sk(sk); |
1042 | int ret; | |
1043 | ||
1044 | if (!up->pending) { | |
1045 | struct msghdr msg = { .msg_flags = flags|MSG_MORE }; | |
1046 | ||
1047 | /* Call udp_sendmsg to specify destination address which | |
1048 | * sendpage interface can't pass. | |
1049 | * This will succeed only when the socket is connected. | |
1050 | */ | |
1051 | ret = udp_sendmsg(NULL, sk, &msg, 0); | |
1052 | if (ret < 0) | |
1053 | return ret; | |
1054 | } | |
1055 | ||
1056 | lock_sock(sk); | |
1057 | ||
1058 | if (unlikely(!up->pending)) { | |
1059 | release_sock(sk); | |
1060 | ||
afd46503 | 1061 | LIMIT_NETDEBUG(KERN_DEBUG pr_fmt("udp cork app bug 3\n")); |
db8dac20 DM |
1062 | return -EINVAL; |
1063 | } | |
1064 | ||
f5fca608 DM |
1065 | ret = ip_append_page(sk, &inet->cork.fl.u.ip4, |
1066 | page, offset, size, flags); | |
db8dac20 DM |
1067 | if (ret == -EOPNOTSUPP) { |
1068 | release_sock(sk); | |
1069 | return sock_no_sendpage(sk->sk_socket, page, offset, | |
1070 | size, flags); | |
1071 | } | |
1072 | if (ret < 0) { | |
1073 | udp_flush_pending_frames(sk); | |
1074 | goto out; | |
1075 | } | |
1076 | ||
1077 | up->len += size; | |
1078 | if (!(up->corkflag || (flags&MSG_MORE))) | |
1079 | ret = udp_push_pending_frames(sk); | |
1080 | if (!ret) | |
1081 | ret = size; | |
1082 | out: | |
1083 | release_sock(sk); | |
1084 | return ret; | |
1085 | } | |
1086 | ||
85584672 ED |
1087 | |
1088 | /** | |
1089 | * first_packet_length - return length of first packet in receive queue | |
1090 | * @sk: socket | |
1091 | * | |
1092 | * Drops all bad checksum frames, until a valid one is found. | |
1093 | * Returns the length of found skb, or 0 if none is found. | |
1094 | */ | |
1095 | static unsigned int first_packet_length(struct sock *sk) | |
1096 | { | |
1097 | struct sk_buff_head list_kill, *rcvq = &sk->sk_receive_queue; | |
1098 | struct sk_buff *skb; | |
1099 | unsigned int res; | |
1100 | ||
1101 | __skb_queue_head_init(&list_kill); | |
1102 | ||
1103 | spin_lock_bh(&rcvq->lock); | |
1104 | while ((skb = skb_peek(rcvq)) != NULL && | |
1105 | udp_lib_checksum_complete(skb)) { | |
1106 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1107 | IS_UDPLITE(sk)); | |
8edf19c2 | 1108 | atomic_inc(&sk->sk_drops); |
85584672 ED |
1109 | __skb_unlink(skb, rcvq); |
1110 | __skb_queue_tail(&list_kill, skb); | |
1111 | } | |
1112 | res = skb ? skb->len : 0; | |
1113 | spin_unlock_bh(&rcvq->lock); | |
1114 | ||
1115 | if (!skb_queue_empty(&list_kill)) { | |
8a74ad60 ED |
1116 | bool slow = lock_sock_fast(sk); |
1117 | ||
85584672 ED |
1118 | __skb_queue_purge(&list_kill); |
1119 | sk_mem_reclaim_partial(sk); | |
8a74ad60 | 1120 | unlock_sock_fast(sk, slow); |
85584672 ED |
1121 | } |
1122 | return res; | |
1123 | } | |
1124 | ||
1da177e4 LT |
1125 | /* |
1126 | * IOCTL requests applicable to the UDP protocol | |
1127 | */ | |
e905a9ed | 1128 | |
1da177e4 LT |
1129 | int udp_ioctl(struct sock *sk, int cmd, unsigned long arg) |
1130 | { | |
6516c655 SH |
1131 | switch (cmd) { |
1132 | case SIOCOUTQ: | |
1da177e4 | 1133 | { |
31e6d363 ED |
1134 | int amount = sk_wmem_alloc_get(sk); |
1135 | ||
6516c655 SH |
1136 | return put_user(amount, (int __user *)arg); |
1137 | } | |
1da177e4 | 1138 | |
6516c655 SH |
1139 | case SIOCINQ: |
1140 | { | |
85584672 | 1141 | unsigned int amount = first_packet_length(sk); |
6516c655 | 1142 | |
85584672 | 1143 | if (amount) |
6516c655 SH |
1144 | /* |
1145 | * We will only return the amount | |
1146 | * of this packet since that is all | |
1147 | * that will be read. | |
1148 | */ | |
85584672 ED |
1149 | amount -= sizeof(struct udphdr); |
1150 | ||
6516c655 SH |
1151 | return put_user(amount, (int __user *)arg); |
1152 | } | |
1da177e4 | 1153 | |
6516c655 SH |
1154 | default: |
1155 | return -ENOIOCTLCMD; | |
1da177e4 | 1156 | } |
6516c655 SH |
1157 | |
1158 | return 0; | |
1da177e4 | 1159 | } |
c482c568 | 1160 | EXPORT_SYMBOL(udp_ioctl); |
1da177e4 | 1161 | |
db8dac20 DM |
1162 | /* |
1163 | * This should be easy, if there is something there we | |
1164 | * return it, otherwise we block. | |
1165 | */ | |
1166 | ||
1167 | int udp_recvmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg, | |
1168 | size_t len, int noblock, int flags, int *addr_len) | |
1169 | { | |
1170 | struct inet_sock *inet = inet_sk(sk); | |
1171 | struct sockaddr_in *sin = (struct sockaddr_in *)msg->msg_name; | |
1172 | struct sk_buff *skb; | |
59c2cdae | 1173 | unsigned int ulen, copied; |
3f518bf7 | 1174 | int peeked, off = 0; |
db8dac20 DM |
1175 | int err; |
1176 | int is_udplite = IS_UDPLITE(sk); | |
8a74ad60 | 1177 | bool slow; |
db8dac20 DM |
1178 | |
1179 | /* | |
1180 | * Check any passed addresses | |
1181 | */ | |
1182 | if (addr_len) | |
c482c568 | 1183 | *addr_len = sizeof(*sin); |
db8dac20 DM |
1184 | |
1185 | if (flags & MSG_ERRQUEUE) | |
1186 | return ip_recv_error(sk, msg, len); | |
1187 | ||
1188 | try_again: | |
1189 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), | |
3f518bf7 | 1190 | &peeked, &off, &err); |
db8dac20 DM |
1191 | if (!skb) |
1192 | goto out; | |
1193 | ||
1194 | ulen = skb->len - sizeof(struct udphdr); | |
59c2cdae DM |
1195 | copied = len; |
1196 | if (copied > ulen) | |
1197 | copied = ulen; | |
1198 | else if (copied < ulen) | |
db8dac20 DM |
1199 | msg->msg_flags |= MSG_TRUNC; |
1200 | ||
1201 | /* | |
1202 | * If checksum is needed at all, try to do it while copying the | |
1203 | * data. If the data is truncated, or if we only want a partial | |
1204 | * coverage checksum (UDP-Lite), do it before the copy. | |
1205 | */ | |
1206 | ||
59c2cdae | 1207 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
db8dac20 DM |
1208 | if (udp_lib_checksum_complete(skb)) |
1209 | goto csum_copy_err; | |
1210 | } | |
1211 | ||
1212 | if (skb_csum_unnecessary(skb)) | |
1213 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), | |
59c2cdae | 1214 | msg->msg_iov, copied); |
db8dac20 | 1215 | else { |
c482c568 ED |
1216 | err = skb_copy_and_csum_datagram_iovec(skb, |
1217 | sizeof(struct udphdr), | |
1218 | msg->msg_iov); | |
db8dac20 DM |
1219 | |
1220 | if (err == -EINVAL) | |
1221 | goto csum_copy_err; | |
1222 | } | |
1223 | ||
22911fc5 ED |
1224 | if (unlikely(err)) { |
1225 | trace_kfree_skb(skb, udp_recvmsg); | |
db8dac20 | 1226 | goto out_free; |
22911fc5 | 1227 | } |
db8dac20 DM |
1228 | |
1229 | if (!peeked) | |
629ca23c PE |
1230 | UDP_INC_STATS_USER(sock_net(sk), |
1231 | UDP_MIB_INDATAGRAMS, is_udplite); | |
db8dac20 | 1232 | |
3b885787 | 1233 | sock_recv_ts_and_drops(msg, sk, skb); |
db8dac20 DM |
1234 | |
1235 | /* Copy the address. */ | |
c482c568 | 1236 | if (sin) { |
db8dac20 DM |
1237 | sin->sin_family = AF_INET; |
1238 | sin->sin_port = udp_hdr(skb)->source; | |
1239 | sin->sin_addr.s_addr = ip_hdr(skb)->saddr; | |
1240 | memset(sin->sin_zero, 0, sizeof(sin->sin_zero)); | |
1241 | } | |
1242 | if (inet->cmsg_flags) | |
1243 | ip_cmsg_recv(msg, skb); | |
1244 | ||
59c2cdae | 1245 | err = copied; |
db8dac20 DM |
1246 | if (flags & MSG_TRUNC) |
1247 | err = ulen; | |
1248 | ||
1249 | out_free: | |
9d410c79 | 1250 | skb_free_datagram_locked(sk, skb); |
db8dac20 DM |
1251 | out: |
1252 | return err; | |
1253 | ||
1254 | csum_copy_err: | |
8a74ad60 | 1255 | slow = lock_sock_fast(sk); |
db8dac20 | 1256 | if (!skb_kill_datagram(sk, skb, flags)) |
629ca23c | 1257 | UDP_INC_STATS_USER(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8a74ad60 | 1258 | unlock_sock_fast(sk, slow); |
db8dac20 DM |
1259 | |
1260 | if (noblock) | |
1261 | return -EAGAIN; | |
9cfaa8de XZ |
1262 | |
1263 | /* starting over for a new packet */ | |
1264 | msg->msg_flags &= ~MSG_TRUNC; | |
db8dac20 DM |
1265 | goto try_again; |
1266 | } | |
1267 | ||
1268 | ||
1da177e4 LT |
1269 | int udp_disconnect(struct sock *sk, int flags) |
1270 | { | |
1271 | struct inet_sock *inet = inet_sk(sk); | |
1272 | /* | |
1273 | * 1003.1g - break association. | |
1274 | */ | |
e905a9ed | 1275 | |
1da177e4 | 1276 | sk->sk_state = TCP_CLOSE; |
c720c7e8 ED |
1277 | inet->inet_daddr = 0; |
1278 | inet->inet_dport = 0; | |
bdeab991 | 1279 | sock_rps_reset_rxhash(sk); |
1da177e4 LT |
1280 | sk->sk_bound_dev_if = 0; |
1281 | if (!(sk->sk_userlocks & SOCK_BINDADDR_LOCK)) | |
1282 | inet_reset_saddr(sk); | |
1283 | ||
1284 | if (!(sk->sk_userlocks & SOCK_BINDPORT_LOCK)) { | |
1285 | sk->sk_prot->unhash(sk); | |
c720c7e8 | 1286 | inet->inet_sport = 0; |
1da177e4 LT |
1287 | } |
1288 | sk_dst_reset(sk); | |
1289 | return 0; | |
1290 | } | |
c482c568 | 1291 | EXPORT_SYMBOL(udp_disconnect); |
1da177e4 | 1292 | |
645ca708 ED |
1293 | void udp_lib_unhash(struct sock *sk) |
1294 | { | |
723b4610 ED |
1295 | if (sk_hashed(sk)) { |
1296 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
512615b6 ED |
1297 | struct udp_hslot *hslot, *hslot2; |
1298 | ||
1299 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1300 | udp_sk(sk)->udp_port_hash); | |
1301 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
645ca708 | 1302 | |
723b4610 ED |
1303 | spin_lock_bh(&hslot->lock); |
1304 | if (sk_nulls_del_node_init_rcu(sk)) { | |
fdcc8aa9 | 1305 | hslot->count--; |
c720c7e8 | 1306 | inet_sk(sk)->inet_num = 0; |
723b4610 | 1307 | sock_prot_inuse_add(sock_net(sk), sk->sk_prot, -1); |
512615b6 ED |
1308 | |
1309 | spin_lock(&hslot2->lock); | |
1310 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1311 | hslot2->count--; | |
1312 | spin_unlock(&hslot2->lock); | |
723b4610 ED |
1313 | } |
1314 | spin_unlock_bh(&hslot->lock); | |
645ca708 | 1315 | } |
645ca708 ED |
1316 | } |
1317 | EXPORT_SYMBOL(udp_lib_unhash); | |
1318 | ||
719f8358 ED |
1319 | /* |
1320 | * inet_rcv_saddr was changed, we must rehash secondary hash | |
1321 | */ | |
1322 | void udp_lib_rehash(struct sock *sk, u16 newhash) | |
1323 | { | |
1324 | if (sk_hashed(sk)) { | |
1325 | struct udp_table *udptable = sk->sk_prot->h.udp_table; | |
1326 | struct udp_hslot *hslot, *hslot2, *nhslot2; | |
1327 | ||
1328 | hslot2 = udp_hashslot2(udptable, udp_sk(sk)->udp_portaddr_hash); | |
1329 | nhslot2 = udp_hashslot2(udptable, newhash); | |
1330 | udp_sk(sk)->udp_portaddr_hash = newhash; | |
1331 | if (hslot2 != nhslot2) { | |
1332 | hslot = udp_hashslot(udptable, sock_net(sk), | |
1333 | udp_sk(sk)->udp_port_hash); | |
1334 | /* we must lock primary chain too */ | |
1335 | spin_lock_bh(&hslot->lock); | |
1336 | ||
1337 | spin_lock(&hslot2->lock); | |
1338 | hlist_nulls_del_init_rcu(&udp_sk(sk)->udp_portaddr_node); | |
1339 | hslot2->count--; | |
1340 | spin_unlock(&hslot2->lock); | |
1341 | ||
1342 | spin_lock(&nhslot2->lock); | |
1343 | hlist_nulls_add_head_rcu(&udp_sk(sk)->udp_portaddr_node, | |
1344 | &nhslot2->head); | |
1345 | nhslot2->count++; | |
1346 | spin_unlock(&nhslot2->lock); | |
1347 | ||
1348 | spin_unlock_bh(&hslot->lock); | |
1349 | } | |
1350 | } | |
1351 | } | |
1352 | EXPORT_SYMBOL(udp_lib_rehash); | |
1353 | ||
1354 | static void udp_v4_rehash(struct sock *sk) | |
1355 | { | |
1356 | u16 new_hash = udp4_portaddr_hash(sock_net(sk), | |
1357 | inet_sk(sk)->inet_rcv_saddr, | |
1358 | inet_sk(sk)->inet_num); | |
1359 | udp_lib_rehash(sk, new_hash); | |
1360 | } | |
1361 | ||
93821778 HX |
1362 | static int __udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1363 | { | |
fec5e652 | 1364 | int rc; |
766e9037 | 1365 | |
fec5e652 | 1366 | if (inet_sk(sk)->inet_daddr) |
bdeab991 | 1367 | sock_rps_save_rxhash(sk, skb); |
fec5e652 | 1368 | |
d826eb14 | 1369 | rc = sock_queue_rcv_skb(sk, skb); |
766e9037 ED |
1370 | if (rc < 0) { |
1371 | int is_udplite = IS_UDPLITE(sk); | |
93821778 | 1372 | |
93821778 | 1373 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 1374 | if (rc == -ENOMEM) |
93821778 HX |
1375 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, |
1376 | is_udplite); | |
766e9037 ED |
1377 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
1378 | kfree_skb(skb); | |
296f7ea7 | 1379 | trace_udp_fail_queue_rcv_skb(rc, sk); |
766e9037 | 1380 | return -1; |
93821778 HX |
1381 | } |
1382 | ||
1383 | return 0; | |
1384 | ||
93821778 HX |
1385 | } |
1386 | ||
447167bf ED |
1387 | static struct static_key udp_encap_needed __read_mostly; |
1388 | void udp_encap_enable(void) | |
1389 | { | |
1390 | if (!static_key_enabled(&udp_encap_needed)) | |
1391 | static_key_slow_inc(&udp_encap_needed); | |
1392 | } | |
1393 | EXPORT_SYMBOL(udp_encap_enable); | |
1394 | ||
db8dac20 DM |
1395 | /* returns: |
1396 | * -1: error | |
1397 | * 0: success | |
1398 | * >0: "udp encap" protocol resubmission | |
1399 | * | |
1400 | * Note that in the success and error cases, the skb is assumed to | |
1401 | * have either been requeued or freed. | |
1402 | */ | |
c482c568 | 1403 | int udp_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
db8dac20 DM |
1404 | { |
1405 | struct udp_sock *up = udp_sk(sk); | |
1406 | int rc; | |
1407 | int is_udplite = IS_UDPLITE(sk); | |
1408 | ||
1409 | /* | |
1410 | * Charge it to the socket, dropping if the queue is full. | |
1411 | */ | |
1412 | if (!xfrm4_policy_check(sk, XFRM_POLICY_IN, skb)) | |
1413 | goto drop; | |
1414 | nf_reset(skb); | |
1415 | ||
447167bf | 1416 | if (static_key_false(&udp_encap_needed) && up->encap_type) { |
0ad92ad0 ED |
1417 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
1418 | ||
db8dac20 DM |
1419 | /* |
1420 | * This is an encapsulation socket so pass the skb to | |
1421 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
1422 | * fall through and pass this up the UDP socket. | |
1423 | * up->encap_rcv() returns the following value: | |
1424 | * =0 if skb was successfully passed to the encap | |
1425 | * handler or was discarded by it. | |
1426 | * >0 if skb should be passed on to UDP. | |
1427 | * <0 if skb should be resubmitted as proto -N | |
1428 | */ | |
1429 | ||
1430 | /* if we're overly short, let UDP handle it */ | |
0ad92ad0 ED |
1431 | encap_rcv = ACCESS_ONCE(up->encap_rcv); |
1432 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
db8dac20 DM |
1433 | int ret; |
1434 | ||
0ad92ad0 | 1435 | ret = encap_rcv(sk, skb); |
db8dac20 | 1436 | if (ret <= 0) { |
0283328e PE |
1437 | UDP_INC_STATS_BH(sock_net(sk), |
1438 | UDP_MIB_INDATAGRAMS, | |
db8dac20 DM |
1439 | is_udplite); |
1440 | return -ret; | |
1441 | } | |
1442 | } | |
1443 | ||
1444 | /* FALLTHROUGH -- it's a UDP Packet */ | |
1445 | } | |
1446 | ||
1447 | /* | |
1448 | * UDP-Lite specific tests, ignored on UDP sockets | |
1449 | */ | |
1450 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { | |
1451 | ||
1452 | /* | |
1453 | * MIB statistics other than incrementing the error count are | |
1454 | * disabled for the following two types of errors: these depend | |
1455 | * on the application settings, not on the functioning of the | |
1456 | * protocol stack as such. | |
1457 | * | |
1458 | * RFC 3828 here recommends (sec 3.3): "There should also be a | |
1459 | * way ... to ... at least let the receiving application block | |
1460 | * delivery of packets with coverage values less than a value | |
1461 | * provided by the application." | |
1462 | */ | |
1463 | if (up->pcrlen == 0) { /* full coverage was set */ | |
afd46503 JP |
1464 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: partial coverage %d while full coverage %d requested\n", |
1465 | UDP_SKB_CB(skb)->cscov, skb->len); | |
db8dac20 DM |
1466 | goto drop; |
1467 | } | |
1468 | /* The next case involves violating the min. coverage requested | |
1469 | * by the receiver. This is subtle: if receiver wants x and x is | |
1470 | * greater than the buffersize/MTU then receiver will complain | |
1471 | * that it wants x while sender emits packets of smaller size y. | |
1472 | * Therefore the above ...()->partial_cov statement is essential. | |
1473 | */ | |
1474 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
afd46503 JP |
1475 | LIMIT_NETDEBUG(KERN_WARNING "UDPLite: coverage %d too small, need min %d\n", |
1476 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
db8dac20 DM |
1477 | goto drop; |
1478 | } | |
1479 | } | |
1480 | ||
33d480ce ED |
1481 | if (rcu_access_pointer(sk->sk_filter) && |
1482 | udp_lib_checksum_complete(skb)) | |
1483 | goto drop; | |
db8dac20 | 1484 | |
c377411f | 1485 | |
f545a38f | 1486 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
c377411f ED |
1487 | goto drop; |
1488 | ||
93821778 | 1489 | rc = 0; |
db8dac20 | 1490 | |
d826eb14 | 1491 | ipv4_pktinfo_prepare(skb); |
93821778 HX |
1492 | bh_lock_sock(sk); |
1493 | if (!sock_owned_by_user(sk)) | |
1494 | rc = __udp_queue_rcv_skb(sk, skb); | |
f545a38f | 1495 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { |
55349790 ZY |
1496 | bh_unlock_sock(sk); |
1497 | goto drop; | |
1498 | } | |
93821778 HX |
1499 | bh_unlock_sock(sk); |
1500 | ||
1501 | return rc; | |
db8dac20 DM |
1502 | |
1503 | drop: | |
0283328e | 1504 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
8edf19c2 | 1505 | atomic_inc(&sk->sk_drops); |
db8dac20 DM |
1506 | kfree_skb(skb); |
1507 | return -1; | |
1508 | } | |
1509 | ||
1240d137 ED |
1510 | |
1511 | static void flush_stack(struct sock **stack, unsigned int count, | |
1512 | struct sk_buff *skb, unsigned int final) | |
1513 | { | |
1514 | unsigned int i; | |
1515 | struct sk_buff *skb1 = NULL; | |
f6b8f32c | 1516 | struct sock *sk; |
1240d137 ED |
1517 | |
1518 | for (i = 0; i < count; i++) { | |
f6b8f32c | 1519 | sk = stack[i]; |
1240d137 ED |
1520 | if (likely(skb1 == NULL)) |
1521 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
1522 | ||
f6b8f32c ED |
1523 | if (!skb1) { |
1524 | atomic_inc(&sk->sk_drops); | |
1525 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
1526 | IS_UDPLITE(sk)); | |
1527 | UDP_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
1528 | IS_UDPLITE(sk)); | |
1529 | } | |
1530 | ||
1531 | if (skb1 && udp_queue_rcv_skb(sk, skb1) <= 0) | |
1240d137 ED |
1532 | skb1 = NULL; |
1533 | } | |
1534 | if (unlikely(skb1)) | |
1535 | kfree_skb(skb1); | |
1536 | } | |
1537 | ||
db8dac20 DM |
1538 | /* |
1539 | * Multicasts and broadcasts go to each listener. | |
1540 | * | |
1240d137 | 1541 | * Note: called only from the BH handler context. |
db8dac20 | 1542 | */ |
e3163493 | 1543 | static int __udp4_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
db8dac20 DM |
1544 | struct udphdr *uh, |
1545 | __be32 saddr, __be32 daddr, | |
645ca708 | 1546 | struct udp_table *udptable) |
db8dac20 | 1547 | { |
1240d137 | 1548 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
f86dcc5a | 1549 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
db8dac20 | 1550 | int dif; |
1240d137 | 1551 | unsigned int i, count = 0; |
db8dac20 | 1552 | |
645ca708 | 1553 | spin_lock(&hslot->lock); |
88ab1932 | 1554 | sk = sk_nulls_head(&hslot->head); |
db8dac20 | 1555 | dif = skb->dev->ifindex; |
920a4611 | 1556 | sk = udp_v4_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1240d137 ED |
1557 | while (sk) { |
1558 | stack[count++] = sk; | |
1559 | sk = udp_v4_mcast_next(net, sk_nulls_next(sk), uh->dest, | |
1560 | daddr, uh->source, saddr, dif); | |
1561 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
1562 | if (!sk) | |
1563 | break; | |
1564 | flush_stack(stack, count, skb, ~0); | |
1565 | count = 0; | |
1566 | } | |
1567 | } | |
1568 | /* | |
1569 | * before releasing chain lock, we must take a reference on sockets | |
1570 | */ | |
1571 | for (i = 0; i < count; i++) | |
1572 | sock_hold(stack[i]); | |
1573 | ||
645ca708 | 1574 | spin_unlock(&hslot->lock); |
1240d137 ED |
1575 | |
1576 | /* | |
1577 | * do the slow work with no lock held | |
1578 | */ | |
1579 | if (count) { | |
1580 | flush_stack(stack, count, skb, count - 1); | |
1581 | ||
1582 | for (i = 0; i < count; i++) | |
1583 | sock_put(stack[i]); | |
1584 | } else { | |
1585 | kfree_skb(skb); | |
1586 | } | |
db8dac20 DM |
1587 | return 0; |
1588 | } | |
1589 | ||
1590 | /* Initialize UDP checksum. If exited with zero value (success), | |
1591 | * CHECKSUM_UNNECESSARY means, that no more checks are required. | |
1592 | * Otherwise, csum completion requires chacksumming packet body, | |
1593 | * including udp header and folding it to skb->csum. | |
1594 | */ | |
1595 | static inline int udp4_csum_init(struct sk_buff *skb, struct udphdr *uh, | |
1596 | int proto) | |
1597 | { | |
1598 | const struct iphdr *iph; | |
1599 | int err; | |
1600 | ||
1601 | UDP_SKB_CB(skb)->partial_cov = 0; | |
1602 | UDP_SKB_CB(skb)->cscov = skb->len; | |
1603 | ||
1604 | if (proto == IPPROTO_UDPLITE) { | |
1605 | err = udplite_checksum_init(skb, uh); | |
1606 | if (err) | |
1607 | return err; | |
1608 | } | |
1609 | ||
1610 | iph = ip_hdr(skb); | |
1611 | if (uh->check == 0) { | |
1612 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1613 | } else if (skb->ip_summed == CHECKSUM_COMPLETE) { | |
c482c568 | 1614 | if (!csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, |
db8dac20 DM |
1615 | proto, skb->csum)) |
1616 | skb->ip_summed = CHECKSUM_UNNECESSARY; | |
1617 | } | |
1618 | if (!skb_csum_unnecessary(skb)) | |
1619 | skb->csum = csum_tcpudp_nofold(iph->saddr, iph->daddr, | |
1620 | skb->len, proto, 0); | |
1621 | /* Probably, we should checksum udp header (it should be in cache | |
1622 | * in any case) and data in tiny packets (< rx copybreak). | |
1623 | */ | |
1624 | ||
1625 | return 0; | |
1626 | } | |
1627 | ||
1628 | /* | |
1629 | * All we need to do is get the socket, and then do a checksum. | |
1630 | */ | |
1631 | ||
645ca708 | 1632 | int __udp4_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
db8dac20 DM |
1633 | int proto) |
1634 | { | |
1635 | struct sock *sk; | |
7b5e56f9 | 1636 | struct udphdr *uh; |
db8dac20 | 1637 | unsigned short ulen; |
adf30907 | 1638 | struct rtable *rt = skb_rtable(skb); |
2783ef23 | 1639 | __be32 saddr, daddr; |
0283328e | 1640 | struct net *net = dev_net(skb->dev); |
db8dac20 DM |
1641 | |
1642 | /* | |
1643 | * Validate the packet. | |
1644 | */ | |
1645 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
1646 | goto drop; /* No space for header. */ | |
1647 | ||
7b5e56f9 | 1648 | uh = udp_hdr(skb); |
db8dac20 | 1649 | ulen = ntohs(uh->len); |
ccc2d97c BM |
1650 | saddr = ip_hdr(skb)->saddr; |
1651 | daddr = ip_hdr(skb)->daddr; | |
1652 | ||
db8dac20 DM |
1653 | if (ulen > skb->len) |
1654 | goto short_packet; | |
1655 | ||
1656 | if (proto == IPPROTO_UDP) { | |
1657 | /* UDP validates ulen. */ | |
1658 | if (ulen < sizeof(*uh) || pskb_trim_rcsum(skb, ulen)) | |
1659 | goto short_packet; | |
1660 | uh = udp_hdr(skb); | |
1661 | } | |
1662 | ||
1663 | if (udp4_csum_init(skb, uh, proto)) | |
1664 | goto csum_error; | |
1665 | ||
1666 | if (rt->rt_flags & (RTCF_BROADCAST|RTCF_MULTICAST)) | |
e3163493 PE |
1667 | return __udp4_lib_mcast_deliver(net, skb, uh, |
1668 | saddr, daddr, udptable); | |
db8dac20 | 1669 | |
607c4aaf | 1670 | sk = __udp4_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
db8dac20 DM |
1671 | |
1672 | if (sk != NULL) { | |
93821778 | 1673 | int ret = udp_queue_rcv_skb(sk, skb); |
db8dac20 DM |
1674 | sock_put(sk); |
1675 | ||
1676 | /* a return value > 0 means to resubmit the input, but | |
1677 | * it wants the return to be -protocol, or 0 | |
1678 | */ | |
1679 | if (ret > 0) | |
1680 | return -ret; | |
1681 | return 0; | |
1682 | } | |
1683 | ||
1684 | if (!xfrm4_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
1685 | goto drop; | |
1686 | nf_reset(skb); | |
1687 | ||
1688 | /* No socket. Drop packet silently, if checksum is wrong */ | |
1689 | if (udp_lib_checksum_complete(skb)) | |
1690 | goto csum_error; | |
1691 | ||
0283328e | 1692 | UDP_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1693 | icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0); |
1694 | ||
1695 | /* | |
1696 | * Hmm. We got an UDP packet to a port to which we | |
1697 | * don't wanna listen. Ignore it. | |
1698 | */ | |
1699 | kfree_skb(skb); | |
1700 | return 0; | |
1701 | ||
1702 | short_packet: | |
673d57e7 | 1703 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: short packet: From %pI4:%u %d/%d to %pI4:%u\n", |
afd46503 JP |
1704 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1705 | &saddr, ntohs(uh->source), | |
1706 | ulen, skb->len, | |
1707 | &daddr, ntohs(uh->dest)); | |
db8dac20 DM |
1708 | goto drop; |
1709 | ||
1710 | csum_error: | |
1711 | /* | |
1712 | * RFC1122: OK. Discards the bad packet silently (as far as | |
1713 | * the network is concerned, anyway) as per 4.1.3.4 (MUST). | |
1714 | */ | |
673d57e7 | 1715 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%s: bad checksum. From %pI4:%u to %pI4:%u ulen %d\n", |
afd46503 JP |
1716 | proto == IPPROTO_UDPLITE ? "Lite" : "", |
1717 | &saddr, ntohs(uh->source), &daddr, ntohs(uh->dest), | |
db8dac20 DM |
1718 | ulen); |
1719 | drop: | |
0283328e | 1720 | UDP_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
db8dac20 DM |
1721 | kfree_skb(skb); |
1722 | return 0; | |
1723 | } | |
1724 | ||
1725 | int udp_rcv(struct sk_buff *skb) | |
1726 | { | |
645ca708 | 1727 | return __udp4_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
db8dac20 DM |
1728 | } |
1729 | ||
7d06b2e0 | 1730 | void udp_destroy_sock(struct sock *sk) |
db8dac20 | 1731 | { |
8a74ad60 | 1732 | bool slow = lock_sock_fast(sk); |
db8dac20 | 1733 | udp_flush_pending_frames(sk); |
8a74ad60 | 1734 | unlock_sock_fast(sk, slow); |
db8dac20 DM |
1735 | } |
1736 | ||
1da177e4 LT |
1737 | /* |
1738 | * Socket option code for UDP | |
1739 | */ | |
4c0a6cb0 | 1740 | int udp_lib_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1741 | char __user *optval, unsigned int optlen, |
4c0a6cb0 | 1742 | int (*push_pending_frames)(struct sock *)) |
1da177e4 LT |
1743 | { |
1744 | struct udp_sock *up = udp_sk(sk); | |
1745 | int val; | |
1746 | int err = 0; | |
b2bf1e26 | 1747 | int is_udplite = IS_UDPLITE(sk); |
1da177e4 | 1748 | |
c482c568 | 1749 | if (optlen < sizeof(int)) |
1da177e4 LT |
1750 | return -EINVAL; |
1751 | ||
1752 | if (get_user(val, (int __user *)optval)) | |
1753 | return -EFAULT; | |
1754 | ||
6516c655 | 1755 | switch (optname) { |
1da177e4 LT |
1756 | case UDP_CORK: |
1757 | if (val != 0) { | |
1758 | up->corkflag = 1; | |
1759 | } else { | |
1760 | up->corkflag = 0; | |
1761 | lock_sock(sk); | |
4c0a6cb0 | 1762 | (*push_pending_frames)(sk); |
1da177e4 LT |
1763 | release_sock(sk); |
1764 | } | |
1765 | break; | |
e905a9ed | 1766 | |
1da177e4 LT |
1767 | case UDP_ENCAP: |
1768 | switch (val) { | |
1769 | case 0: | |
1770 | case UDP_ENCAP_ESPINUDP: | |
1771 | case UDP_ENCAP_ESPINUDP_NON_IKE: | |
067b207b JC |
1772 | up->encap_rcv = xfrm4_udp_encap_rcv; |
1773 | /* FALLTHROUGH */ | |
342f0234 | 1774 | case UDP_ENCAP_L2TPINUDP: |
1da177e4 | 1775 | up->encap_type = val; |
447167bf | 1776 | udp_encap_enable(); |
1da177e4 LT |
1777 | break; |
1778 | default: | |
1779 | err = -ENOPROTOOPT; | |
1780 | break; | |
1781 | } | |
1782 | break; | |
1783 | ||
ba4e58ec GR |
1784 | /* |
1785 | * UDP-Lite's partial checksum coverage (RFC 3828). | |
1786 | */ | |
1787 | /* The sender sets actual checksum coverage length via this option. | |
1788 | * The case coverage > packet length is handled by send module. */ | |
1789 | case UDPLITE_SEND_CSCOV: | |
b2bf1e26 | 1790 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1791 | return -ENOPROTOOPT; |
1792 | if (val != 0 && val < 8) /* Illegal coverage: use default (8) */ | |
1793 | val = 8; | |
4be929be AD |
1794 | else if (val > USHRT_MAX) |
1795 | val = USHRT_MAX; | |
ba4e58ec GR |
1796 | up->pcslen = val; |
1797 | up->pcflag |= UDPLITE_SEND_CC; | |
1798 | break; | |
1799 | ||
e905a9ed YH |
1800 | /* The receiver specifies a minimum checksum coverage value. To make |
1801 | * sense, this should be set to at least 8 (as done below). If zero is | |
ba4e58ec GR |
1802 | * used, this again means full checksum coverage. */ |
1803 | case UDPLITE_RECV_CSCOV: | |
b2bf1e26 | 1804 | if (!is_udplite) /* Disable the option on UDP sockets */ |
ba4e58ec GR |
1805 | return -ENOPROTOOPT; |
1806 | if (val != 0 && val < 8) /* Avoid silly minimal values. */ | |
1807 | val = 8; | |
4be929be AD |
1808 | else if (val > USHRT_MAX) |
1809 | val = USHRT_MAX; | |
ba4e58ec GR |
1810 | up->pcrlen = val; |
1811 | up->pcflag |= UDPLITE_RECV_CC; | |
1812 | break; | |
1813 | ||
1da177e4 LT |
1814 | default: |
1815 | err = -ENOPROTOOPT; | |
1816 | break; | |
6516c655 | 1817 | } |
1da177e4 LT |
1818 | |
1819 | return err; | |
1820 | } | |
c482c568 | 1821 | EXPORT_SYMBOL(udp_lib_setsockopt); |
1da177e4 | 1822 | |
db8dac20 | 1823 | int udp_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1824 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1825 | { |
1826 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1827 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1828 | udp_push_pending_frames); | |
1829 | return ip_setsockopt(sk, level, optname, optval, optlen); | |
1830 | } | |
1831 | ||
1832 | #ifdef CONFIG_COMPAT | |
1833 | int compat_udp_setsockopt(struct sock *sk, int level, int optname, | |
b7058842 | 1834 | char __user *optval, unsigned int optlen) |
db8dac20 DM |
1835 | { |
1836 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1837 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, | |
1838 | udp_push_pending_frames); | |
1839 | return compat_ip_setsockopt(sk, level, optname, optval, optlen); | |
1840 | } | |
1841 | #endif | |
1842 | ||
4c0a6cb0 GR |
1843 | int udp_lib_getsockopt(struct sock *sk, int level, int optname, |
1844 | char __user *optval, int __user *optlen) | |
1da177e4 LT |
1845 | { |
1846 | struct udp_sock *up = udp_sk(sk); | |
1847 | int val, len; | |
1848 | ||
c482c568 | 1849 | if (get_user(len, optlen)) |
1da177e4 LT |
1850 | return -EFAULT; |
1851 | ||
1852 | len = min_t(unsigned int, len, sizeof(int)); | |
e905a9ed | 1853 | |
6516c655 | 1854 | if (len < 0) |
1da177e4 LT |
1855 | return -EINVAL; |
1856 | ||
6516c655 | 1857 | switch (optname) { |
1da177e4 LT |
1858 | case UDP_CORK: |
1859 | val = up->corkflag; | |
1860 | break; | |
1861 | ||
1862 | case UDP_ENCAP: | |
1863 | val = up->encap_type; | |
1864 | break; | |
1865 | ||
ba4e58ec GR |
1866 | /* The following two cannot be changed on UDP sockets, the return is |
1867 | * always 0 (which corresponds to the full checksum coverage of UDP). */ | |
1868 | case UDPLITE_SEND_CSCOV: | |
1869 | val = up->pcslen; | |
1870 | break; | |
1871 | ||
1872 | case UDPLITE_RECV_CSCOV: | |
1873 | val = up->pcrlen; | |
1874 | break; | |
1875 | ||
1da177e4 LT |
1876 | default: |
1877 | return -ENOPROTOOPT; | |
6516c655 | 1878 | } |
1da177e4 | 1879 | |
6516c655 | 1880 | if (put_user(len, optlen)) |
e905a9ed | 1881 | return -EFAULT; |
c482c568 | 1882 | if (copy_to_user(optval, &val, len)) |
1da177e4 | 1883 | return -EFAULT; |
e905a9ed | 1884 | return 0; |
1da177e4 | 1885 | } |
c482c568 | 1886 | EXPORT_SYMBOL(udp_lib_getsockopt); |
1da177e4 | 1887 | |
db8dac20 DM |
1888 | int udp_getsockopt(struct sock *sk, int level, int optname, |
1889 | char __user *optval, int __user *optlen) | |
1890 | { | |
1891 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1892 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1893 | return ip_getsockopt(sk, level, optname, optval, optlen); | |
1894 | } | |
1895 | ||
1896 | #ifdef CONFIG_COMPAT | |
1897 | int compat_udp_getsockopt(struct sock *sk, int level, int optname, | |
1898 | char __user *optval, int __user *optlen) | |
1899 | { | |
1900 | if (level == SOL_UDP || level == SOL_UDPLITE) | |
1901 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); | |
1902 | return compat_ip_getsockopt(sk, level, optname, optval, optlen); | |
1903 | } | |
1904 | #endif | |
1da177e4 LT |
1905 | /** |
1906 | * udp_poll - wait for a UDP event. | |
1907 | * @file - file struct | |
1908 | * @sock - socket | |
1909 | * @wait - poll table | |
1910 | * | |
e905a9ed | 1911 | * This is same as datagram poll, except for the special case of |
1da177e4 LT |
1912 | * blocking sockets. If application is using a blocking fd |
1913 | * and a packet with checksum error is in the queue; | |
1914 | * then it could get return from select indicating data available | |
1915 | * but then block when reading it. Add special case code | |
1916 | * to work around these arguably broken applications. | |
1917 | */ | |
1918 | unsigned int udp_poll(struct file *file, struct socket *sock, poll_table *wait) | |
1919 | { | |
1920 | unsigned int mask = datagram_poll(file, sock, wait); | |
1921 | struct sock *sk = sock->sk; | |
ba4e58ec | 1922 | |
1da177e4 | 1923 | /* Check for false positives due to checksum errors */ |
85584672 ED |
1924 | if ((mask & POLLRDNORM) && !(file->f_flags & O_NONBLOCK) && |
1925 | !(sk->sk_shutdown & RCV_SHUTDOWN) && !first_packet_length(sk)) | |
1926 | mask &= ~(POLLIN | POLLRDNORM); | |
1da177e4 LT |
1927 | |
1928 | return mask; | |
e905a9ed | 1929 | |
1da177e4 | 1930 | } |
c482c568 | 1931 | EXPORT_SYMBOL(udp_poll); |
1da177e4 | 1932 | |
db8dac20 DM |
1933 | struct proto udp_prot = { |
1934 | .name = "UDP", | |
1935 | .owner = THIS_MODULE, | |
1936 | .close = udp_lib_close, | |
1937 | .connect = ip4_datagram_connect, | |
1938 | .disconnect = udp_disconnect, | |
1939 | .ioctl = udp_ioctl, | |
1940 | .destroy = udp_destroy_sock, | |
1941 | .setsockopt = udp_setsockopt, | |
1942 | .getsockopt = udp_getsockopt, | |
1943 | .sendmsg = udp_sendmsg, | |
1944 | .recvmsg = udp_recvmsg, | |
1945 | .sendpage = udp_sendpage, | |
93821778 | 1946 | .backlog_rcv = __udp_queue_rcv_skb, |
db8dac20 DM |
1947 | .hash = udp_lib_hash, |
1948 | .unhash = udp_lib_unhash, | |
719f8358 | 1949 | .rehash = udp_v4_rehash, |
db8dac20 DM |
1950 | .get_port = udp_v4_get_port, |
1951 | .memory_allocated = &udp_memory_allocated, | |
1952 | .sysctl_mem = sysctl_udp_mem, | |
1953 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1954 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
1955 | .obj_size = sizeof(struct udp_sock), | |
271b72c7 | 1956 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1957 | .h.udp_table = &udp_table, |
db8dac20 DM |
1958 | #ifdef CONFIG_COMPAT |
1959 | .compat_setsockopt = compat_udp_setsockopt, | |
1960 | .compat_getsockopt = compat_udp_getsockopt, | |
1961 | #endif | |
fcbdf09d | 1962 | .clear_sk = sk_prot_clear_portaddr_nulls, |
db8dac20 | 1963 | }; |
c482c568 | 1964 | EXPORT_SYMBOL(udp_prot); |
1da177e4 LT |
1965 | |
1966 | /* ------------------------------------------------------------------------ */ | |
1967 | #ifdef CONFIG_PROC_FS | |
1968 | ||
645ca708 | 1969 | static struct sock *udp_get_first(struct seq_file *seq, int start) |
1da177e4 LT |
1970 | { |
1971 | struct sock *sk; | |
1972 | struct udp_iter_state *state = seq->private; | |
6f191efe | 1973 | struct net *net = seq_file_net(seq); |
1da177e4 | 1974 | |
f86dcc5a ED |
1975 | for (state->bucket = start; state->bucket <= state->udp_table->mask; |
1976 | ++state->bucket) { | |
88ab1932 | 1977 | struct hlist_nulls_node *node; |
645ca708 | 1978 | struct udp_hslot *hslot = &state->udp_table->hash[state->bucket]; |
f86dcc5a ED |
1979 | |
1980 | if (hlist_nulls_empty(&hslot->head)) | |
1981 | continue; | |
1982 | ||
645ca708 | 1983 | spin_lock_bh(&hslot->lock); |
88ab1932 | 1984 | sk_nulls_for_each(sk, node, &hslot->head) { |
878628fb | 1985 | if (!net_eq(sock_net(sk), net)) |
a91275ef | 1986 | continue; |
1da177e4 LT |
1987 | if (sk->sk_family == state->family) |
1988 | goto found; | |
1989 | } | |
645ca708 | 1990 | spin_unlock_bh(&hslot->lock); |
1da177e4 LT |
1991 | } |
1992 | sk = NULL; | |
1993 | found: | |
1994 | return sk; | |
1995 | } | |
1996 | ||
1997 | static struct sock *udp_get_next(struct seq_file *seq, struct sock *sk) | |
1998 | { | |
1999 | struct udp_iter_state *state = seq->private; | |
6f191efe | 2000 | struct net *net = seq_file_net(seq); |
1da177e4 LT |
2001 | |
2002 | do { | |
88ab1932 | 2003 | sk = sk_nulls_next(sk); |
878628fb | 2004 | } while (sk && (!net_eq(sock_net(sk), net) || sk->sk_family != state->family)); |
1da177e4 | 2005 | |
645ca708 | 2006 | if (!sk) { |
f86dcc5a | 2007 | if (state->bucket <= state->udp_table->mask) |
30842f29 | 2008 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
645ca708 | 2009 | return udp_get_first(seq, state->bucket + 1); |
1da177e4 LT |
2010 | } |
2011 | return sk; | |
2012 | } | |
2013 | ||
2014 | static struct sock *udp_get_idx(struct seq_file *seq, loff_t pos) | |
2015 | { | |
645ca708 | 2016 | struct sock *sk = udp_get_first(seq, 0); |
1da177e4 LT |
2017 | |
2018 | if (sk) | |
6516c655 | 2019 | while (pos && (sk = udp_get_next(seq, sk)) != NULL) |
1da177e4 LT |
2020 | --pos; |
2021 | return pos ? NULL : sk; | |
2022 | } | |
2023 | ||
2024 | static void *udp_seq_start(struct seq_file *seq, loff_t *pos) | |
2025 | { | |
30842f29 | 2026 | struct udp_iter_state *state = seq->private; |
f86dcc5a | 2027 | state->bucket = MAX_UDP_PORTS; |
30842f29 | 2028 | |
b50660f1 | 2029 | return *pos ? udp_get_idx(seq, *pos-1) : SEQ_START_TOKEN; |
1da177e4 LT |
2030 | } |
2031 | ||
2032 | static void *udp_seq_next(struct seq_file *seq, void *v, loff_t *pos) | |
2033 | { | |
2034 | struct sock *sk; | |
2035 | ||
b50660f1 | 2036 | if (v == SEQ_START_TOKEN) |
1da177e4 LT |
2037 | sk = udp_get_idx(seq, 0); |
2038 | else | |
2039 | sk = udp_get_next(seq, v); | |
2040 | ||
2041 | ++*pos; | |
2042 | return sk; | |
2043 | } | |
2044 | ||
2045 | static void udp_seq_stop(struct seq_file *seq, void *v) | |
2046 | { | |
645ca708 ED |
2047 | struct udp_iter_state *state = seq->private; |
2048 | ||
f86dcc5a | 2049 | if (state->bucket <= state->udp_table->mask) |
645ca708 | 2050 | spin_unlock_bh(&state->udp_table->hash[state->bucket].lock); |
1da177e4 LT |
2051 | } |
2052 | ||
73cb88ec | 2053 | int udp_seq_open(struct inode *inode, struct file *file) |
1da177e4 LT |
2054 | { |
2055 | struct udp_seq_afinfo *afinfo = PDE(inode)->data; | |
a2be75c1 DL |
2056 | struct udp_iter_state *s; |
2057 | int err; | |
a91275ef | 2058 | |
a2be75c1 DL |
2059 | err = seq_open_net(inode, file, &afinfo->seq_ops, |
2060 | sizeof(struct udp_iter_state)); | |
2061 | if (err < 0) | |
2062 | return err; | |
a91275ef | 2063 | |
a2be75c1 | 2064 | s = ((struct seq_file *)file->private_data)->private; |
1da177e4 | 2065 | s->family = afinfo->family; |
645ca708 | 2066 | s->udp_table = afinfo->udp_table; |
a2be75c1 | 2067 | return err; |
a91275ef | 2068 | } |
73cb88ec | 2069 | EXPORT_SYMBOL(udp_seq_open); |
a91275ef | 2070 | |
1da177e4 | 2071 | /* ------------------------------------------------------------------------ */ |
0c96d8c5 | 2072 | int udp_proc_register(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 LT |
2073 | { |
2074 | struct proc_dir_entry *p; | |
2075 | int rc = 0; | |
2076 | ||
dda61925 DL |
2077 | afinfo->seq_ops.start = udp_seq_start; |
2078 | afinfo->seq_ops.next = udp_seq_next; | |
2079 | afinfo->seq_ops.stop = udp_seq_stop; | |
2080 | ||
84841c3c | 2081 | p = proc_create_data(afinfo->name, S_IRUGO, net->proc_net, |
73cb88ec | 2082 | afinfo->seq_fops, afinfo); |
84841c3c | 2083 | if (!p) |
1da177e4 LT |
2084 | rc = -ENOMEM; |
2085 | return rc; | |
2086 | } | |
c482c568 | 2087 | EXPORT_SYMBOL(udp_proc_register); |
1da177e4 | 2088 | |
0c96d8c5 | 2089 | void udp_proc_unregister(struct net *net, struct udp_seq_afinfo *afinfo) |
1da177e4 | 2090 | { |
0c96d8c5 | 2091 | proc_net_remove(net, afinfo->name); |
1da177e4 | 2092 | } |
c482c568 | 2093 | EXPORT_SYMBOL(udp_proc_unregister); |
db8dac20 DM |
2094 | |
2095 | /* ------------------------------------------------------------------------ */ | |
5e659e4c PE |
2096 | static void udp4_format_sock(struct sock *sp, struct seq_file *f, |
2097 | int bucket, int *len) | |
db8dac20 DM |
2098 | { |
2099 | struct inet_sock *inet = inet_sk(sp); | |
c720c7e8 ED |
2100 | __be32 dest = inet->inet_daddr; |
2101 | __be32 src = inet->inet_rcv_saddr; | |
2102 | __u16 destp = ntohs(inet->inet_dport); | |
2103 | __u16 srcp = ntohs(inet->inet_sport); | |
db8dac20 | 2104 | |
f86dcc5a | 2105 | seq_printf(f, "%5d: %08X:%04X %08X:%04X" |
71338aa7 | 2106 | " %02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d%n", |
db8dac20 | 2107 | bucket, src, srcp, dest, destp, sp->sk_state, |
31e6d363 ED |
2108 | sk_wmem_alloc_get(sp), |
2109 | sk_rmem_alloc_get(sp), | |
db8dac20 | 2110 | 0, 0L, 0, sock_i_uid(sp), 0, sock_i_ino(sp), |
cb61cb9b ED |
2111 | atomic_read(&sp->sk_refcnt), sp, |
2112 | atomic_read(&sp->sk_drops), len); | |
db8dac20 DM |
2113 | } |
2114 | ||
2115 | int udp4_seq_show(struct seq_file *seq, void *v) | |
2116 | { | |
2117 | if (v == SEQ_START_TOKEN) | |
2118 | seq_printf(seq, "%-127s\n", | |
2119 | " sl local_address rem_address st tx_queue " | |
2120 | "rx_queue tr tm->when retrnsmt uid timeout " | |
cb61cb9b | 2121 | "inode ref pointer drops"); |
db8dac20 | 2122 | else { |
db8dac20 | 2123 | struct udp_iter_state *state = seq->private; |
5e659e4c | 2124 | int len; |
db8dac20 | 2125 | |
5e659e4c | 2126 | udp4_format_sock(v, seq, state->bucket, &len); |
c482c568 | 2127 | seq_printf(seq, "%*s\n", 127 - len, ""); |
db8dac20 DM |
2128 | } |
2129 | return 0; | |
2130 | } | |
2131 | ||
73cb88ec AV |
2132 | static const struct file_operations udp_afinfo_seq_fops = { |
2133 | .owner = THIS_MODULE, | |
2134 | .open = udp_seq_open, | |
2135 | .read = seq_read, | |
2136 | .llseek = seq_lseek, | |
2137 | .release = seq_release_net | |
2138 | }; | |
2139 | ||
db8dac20 | 2140 | /* ------------------------------------------------------------------------ */ |
db8dac20 | 2141 | static struct udp_seq_afinfo udp4_seq_afinfo = { |
db8dac20 DM |
2142 | .name = "udp", |
2143 | .family = AF_INET, | |
645ca708 | 2144 | .udp_table = &udp_table, |
73cb88ec | 2145 | .seq_fops = &udp_afinfo_seq_fops, |
dda61925 DL |
2146 | .seq_ops = { |
2147 | .show = udp4_seq_show, | |
2148 | }, | |
db8dac20 DM |
2149 | }; |
2150 | ||
2c8c1e72 | 2151 | static int __net_init udp4_proc_init_net(struct net *net) |
15439feb PE |
2152 | { |
2153 | return udp_proc_register(net, &udp4_seq_afinfo); | |
2154 | } | |
2155 | ||
2c8c1e72 | 2156 | static void __net_exit udp4_proc_exit_net(struct net *net) |
15439feb PE |
2157 | { |
2158 | udp_proc_unregister(net, &udp4_seq_afinfo); | |
2159 | } | |
2160 | ||
2161 | static struct pernet_operations udp4_net_ops = { | |
2162 | .init = udp4_proc_init_net, | |
2163 | .exit = udp4_proc_exit_net, | |
2164 | }; | |
2165 | ||
db8dac20 DM |
2166 | int __init udp4_proc_init(void) |
2167 | { | |
15439feb | 2168 | return register_pernet_subsys(&udp4_net_ops); |
db8dac20 DM |
2169 | } |
2170 | ||
2171 | void udp4_proc_exit(void) | |
2172 | { | |
15439feb | 2173 | unregister_pernet_subsys(&udp4_net_ops); |
db8dac20 | 2174 | } |
1da177e4 LT |
2175 | #endif /* CONFIG_PROC_FS */ |
2176 | ||
f86dcc5a ED |
2177 | static __initdata unsigned long uhash_entries; |
2178 | static int __init set_uhash_entries(char *str) | |
645ca708 | 2179 | { |
413c27d8 EZ |
2180 | ssize_t ret; |
2181 | ||
f86dcc5a ED |
2182 | if (!str) |
2183 | return 0; | |
413c27d8 EZ |
2184 | |
2185 | ret = kstrtoul(str, 0, &uhash_entries); | |
2186 | if (ret) | |
2187 | return 0; | |
2188 | ||
f86dcc5a ED |
2189 | if (uhash_entries && uhash_entries < UDP_HTABLE_SIZE_MIN) |
2190 | uhash_entries = UDP_HTABLE_SIZE_MIN; | |
2191 | return 1; | |
2192 | } | |
2193 | __setup("uhash_entries=", set_uhash_entries); | |
645ca708 | 2194 | |
f86dcc5a ED |
2195 | void __init udp_table_init(struct udp_table *table, const char *name) |
2196 | { | |
2197 | unsigned int i; | |
2198 | ||
31fe62b9 TB |
2199 | table->hash = alloc_large_system_hash(name, |
2200 | 2 * sizeof(struct udp_hslot), | |
2201 | uhash_entries, | |
2202 | 21, /* one slot per 2 MB */ | |
2203 | 0, | |
2204 | &table->log, | |
2205 | &table->mask, | |
2206 | UDP_HTABLE_SIZE_MIN, | |
2207 | 64 * 1024); | |
2208 | ||
512615b6 | 2209 | table->hash2 = table->hash + (table->mask + 1); |
f86dcc5a | 2210 | for (i = 0; i <= table->mask; i++) { |
88ab1932 | 2211 | INIT_HLIST_NULLS_HEAD(&table->hash[i].head, i); |
fdcc8aa9 | 2212 | table->hash[i].count = 0; |
645ca708 ED |
2213 | spin_lock_init(&table->hash[i].lock); |
2214 | } | |
512615b6 ED |
2215 | for (i = 0; i <= table->mask; i++) { |
2216 | INIT_HLIST_NULLS_HEAD(&table->hash2[i].head, i); | |
2217 | table->hash2[i].count = 0; | |
2218 | spin_lock_init(&table->hash2[i].lock); | |
2219 | } | |
645ca708 ED |
2220 | } |
2221 | ||
95766fff HA |
2222 | void __init udp_init(void) |
2223 | { | |
f03d78db | 2224 | unsigned long limit; |
95766fff | 2225 | |
f86dcc5a | 2226 | udp_table_init(&udp_table, "UDP"); |
f03d78db | 2227 | limit = nr_free_buffer_pages() / 8; |
95766fff HA |
2228 | limit = max(limit, 128UL); |
2229 | sysctl_udp_mem[0] = limit / 4 * 3; | |
2230 | sysctl_udp_mem[1] = limit; | |
2231 | sysctl_udp_mem[2] = sysctl_udp_mem[0] * 2; | |
2232 | ||
2233 | sysctl_udp_rmem_min = SK_MEM_QUANTUM; | |
2234 | sysctl_udp_wmem_min = SK_MEM_QUANTUM; | |
2235 | } | |
2236 | ||
d7ca4cc0 SS |
2237 | int udp4_ufo_send_check(struct sk_buff *skb) |
2238 | { | |
2239 | const struct iphdr *iph; | |
2240 | struct udphdr *uh; | |
2241 | ||
2242 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
2243 | return -EINVAL; | |
2244 | ||
2245 | iph = ip_hdr(skb); | |
2246 | uh = udp_hdr(skb); | |
2247 | ||
2248 | uh->check = ~csum_tcpudp_magic(iph->saddr, iph->daddr, skb->len, | |
2249 | IPPROTO_UDP, 0); | |
2250 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
2251 | skb->csum_offset = offsetof(struct udphdr, check); | |
2252 | skb->ip_summed = CHECKSUM_PARTIAL; | |
2253 | return 0; | |
2254 | } | |
2255 | ||
c8f44aff MM |
2256 | struct sk_buff *udp4_ufo_fragment(struct sk_buff *skb, |
2257 | netdev_features_t features) | |
d7ca4cc0 SS |
2258 | { |
2259 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
2260 | unsigned int mss; | |
2261 | int offset; | |
2262 | __wsum csum; | |
2263 | ||
2264 | mss = skb_shinfo(skb)->gso_size; | |
2265 | if (unlikely(skb->len <= mss)) | |
2266 | goto out; | |
2267 | ||
2268 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
2269 | /* Packet is from an untrusted source, reset gso_segs. */ | |
2270 | int type = skb_shinfo(skb)->gso_type; | |
2271 | ||
2272 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
2273 | !(type & (SKB_GSO_UDP)))) | |
2274 | goto out; | |
2275 | ||
2276 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
2277 | ||
2278 | segs = NULL; | |
2279 | goto out; | |
2280 | } | |
2281 | ||
2282 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
2283 | * do checksum of UDP packets sent as multiple IP fragments. | |
2284 | */ | |
55508d60 | 2285 | offset = skb_checksum_start_offset(skb); |
c482c568 | 2286 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
d7ca4cc0 SS |
2287 | offset += skb->csum_offset; |
2288 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
2289 | skb->ip_summed = CHECKSUM_NONE; | |
2290 | ||
2291 | /* Fragment the skb. IP headers of the fragments are updated in | |
2292 | * inet_gso_segment() | |
2293 | */ | |
2294 | segs = skb_segment(skb, features); | |
2295 | out: | |
2296 | return segs; | |
2297 | } | |
2298 |