Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | |
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
0bd84065 | 49 | #include <net/inet_hashtables.h> |
72289b96 | 50 | #include <net/inet6_hashtables.h> |
076bb0c8 | 51 | #include <net/busy_poll.h> |
e32ea7e7 | 52 | #include <net/sock_reuseport.h> |
1da177e4 LT |
53 | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/seq_file.h> | |
22911fc5 | 56 | #include <trace/events/skb.h> |
ba4e58ec | 57 | #include "udp_impl.h" |
1da177e4 | 58 | |
63a6fff3 RS |
59 | static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) |
60 | { | |
61 | #if defined(CONFIG_NET_L3_MASTER_DEV) | |
62 | if (!net->ipv4.sysctl_udp_l3mdev_accept && | |
63 | skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) | |
64 | return true; | |
65 | #endif | |
66 | return false; | |
67 | } | |
68 | ||
6eada011 ED |
69 | static u32 udp6_ehashfn(const struct net *net, |
70 | const struct in6_addr *laddr, | |
71 | const u16 lport, | |
72 | const struct in6_addr *faddr, | |
73 | const __be16 fport) | |
b50026b5 | 74 | { |
1bbdceef HFS |
75 | static u32 udp6_ehash_secret __read_mostly; |
76 | static u32 udp_ipv6_hash_secret __read_mostly; | |
77 | ||
78 | u32 lhash, fhash; | |
79 | ||
80 | net_get_random_once(&udp6_ehash_secret, | |
81 | sizeof(udp6_ehash_secret)); | |
82 | net_get_random_once(&udp_ipv6_hash_secret, | |
83 | sizeof(udp_ipv6_hash_secret)); | |
84 | ||
85 | lhash = (__force u32)laddr->s6_addr32[3]; | |
86 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
87 | ||
b50026b5 | 88 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 89 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
90 | } |
91 | ||
6ba5a3c5 | 92 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 93 | { |
30fff923 | 94 | unsigned int hash2_nulladdr = |
f0b1e64c | 95 | ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
9a52e97e | 96 | unsigned int hash2_partial = |
f0b1e64c | 97 | ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 98 | |
d4cada4a | 99 | /* precompute partial secondary hash */ |
30fff923 | 100 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 101 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
1da177e4 LT |
102 | } |
103 | ||
719f8358 ED |
104 | static void udp_v6_rehash(struct sock *sk) |
105 | { | |
f0b1e64c | 106 | u16 new_hash = ipv6_portaddr_hash(sock_net(sk), |
efe4208f | 107 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
108 | inet_sk(sk)->inet_num); |
109 | ||
110 | udp_lib_rehash(sk, new_hash); | |
111 | } | |
112 | ||
d1e37288 SX |
113 | static int compute_score(struct sock *sk, struct net *net, |
114 | const struct in6_addr *saddr, __be16 sport, | |
115 | const struct in6_addr *daddr, unsigned short hnum, | |
1801b570 | 116 | int dif, int sdif, bool exact_dif) |
645ca708 | 117 | { |
60c04aec JP |
118 | int score; |
119 | struct inet_sock *inet; | |
120 | ||
121 | if (!net_eq(sock_net(sk), net) || | |
122 | udp_sk(sk)->udp_port_hash != hnum || | |
123 | sk->sk_family != PF_INET6) | |
124 | return -1; | |
125 | ||
126 | score = 0; | |
127 | inet = inet_sk(sk); | |
128 | ||
129 | if (inet->inet_dport) { | |
130 | if (inet->inet_dport != sport) | |
131 | return -1; | |
132 | score++; | |
133 | } | |
134 | ||
135 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
136 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | ||
141 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
142 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
143 | return -1; | |
144 | score++; | |
145 | } | |
146 | ||
63a6fff3 | 147 | if (sk->sk_bound_dev_if || exact_dif) { |
1801b570 DA |
148 | bool dev_match = (sk->sk_bound_dev_if == dif || |
149 | sk->sk_bound_dev_if == sdif); | |
150 | ||
151 | if (exact_dif && !dev_match) | |
60c04aec | 152 | return -1; |
1801b570 DA |
153 | if (sk->sk_bound_dev_if && dev_match) |
154 | score++; | |
645ca708 | 155 | } |
60c04aec | 156 | |
70da268b ED |
157 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
158 | score++; | |
159 | ||
645ca708 ED |
160 | return score; |
161 | } | |
162 | ||
d1e37288 | 163 | /* called with rcu_read_lock() */ |
fddc17de ED |
164 | static struct sock *udp6_lib_lookup2(struct net *net, |
165 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 DA |
166 | const struct in6_addr *daddr, unsigned int hnum, |
167 | int dif, int sdif, bool exact_dif, | |
168 | struct udp_hslot *hslot2, struct sk_buff *skb) | |
fddc17de ED |
169 | { |
170 | struct sock *sk, *result; | |
e94a62f5 | 171 | int score, badness; |
72289b96 | 172 | u32 hash = 0; |
fddc17de | 173 | |
fddc17de ED |
174 | result = NULL; |
175 | badness = -1; | |
ca065d0c | 176 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 177 | score = compute_score(sk, net, saddr, sport, |
1801b570 | 178 | daddr, hnum, dif, sdif, exact_dif); |
fddc17de | 179 | if (score > badness) { |
e94a62f5 | 180 | if (sk->sk_reuseport) { |
b50026b5 HFS |
181 | hash = udp6_ehashfn(net, daddr, hnum, |
182 | saddr, sport); | |
ed0dfffd | 183 | |
ca065d0c | 184 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 185 | sizeof(struct udphdr)); |
ca065d0c ED |
186 | if (result) |
187 | return result; | |
70da268b | 188 | } |
ca065d0c ED |
189 | result = sk; |
190 | badness = score; | |
fddc17de ED |
191 | } |
192 | } | |
fddc17de ED |
193 | return result; |
194 | } | |
195 | ||
ca065d0c | 196 | /* rcu_read_lock() must be held */ |
fce82338 | 197 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
198 | const struct in6_addr *saddr, __be16 sport, |
199 | const struct in6_addr *daddr, __be16 dport, | |
200 | int dif, int sdif, struct udp_table *udptable, | |
201 | struct sk_buff *skb) | |
1da177e4 | 202 | { |
271b72c7 | 203 | struct sock *sk, *result; |
1da177e4 | 204 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
205 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
206 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
63a6fff3 | 207 | bool exact_dif = udp6_lib_exact_dif_match(net, skb); |
e94a62f5 | 208 | int score, badness; |
72289b96 | 209 | u32 hash = 0; |
645ca708 | 210 | |
fddc17de | 211 | if (hslot->count > 10) { |
f0b1e64c | 212 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
fddc17de ED |
213 | slot2 = hash2 & udptable->mask; |
214 | hslot2 = &udptable->hash2[slot2]; | |
215 | if (hslot->count < hslot2->count) | |
216 | goto begin; | |
217 | ||
218 | result = udp6_lib_lookup2(net, saddr, sport, | |
1801b570 | 219 | daddr, hnum, dif, sdif, exact_dif, |
d1e37288 | 220 | hslot2, skb); |
fddc17de | 221 | if (!result) { |
d1e37288 | 222 | unsigned int old_slot2 = slot2; |
f0b1e64c | 223 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); |
fddc17de | 224 | slot2 = hash2 & udptable->mask; |
d1e37288 SX |
225 | /* avoid searching the same slot again. */ |
226 | if (unlikely(slot2 == old_slot2)) | |
227 | return result; | |
228 | ||
fddc17de ED |
229 | hslot2 = &udptable->hash2[slot2]; |
230 | if (hslot->count < hslot2->count) | |
231 | goto begin; | |
232 | ||
1223c67c | 233 | result = udp6_lib_lookup2(net, saddr, sport, |
1801b570 | 234 | daddr, hnum, dif, sdif, |
63a6fff3 RS |
235 | exact_dif, hslot2, |
236 | skb); | |
fddc17de | 237 | } |
fddc17de ED |
238 | return result; |
239 | } | |
271b72c7 ED |
240 | begin: |
241 | result = NULL; | |
242 | badness = -1; | |
ca065d0c | 243 | sk_for_each_rcu(sk, &hslot->head) { |
63a6fff3 | 244 | score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, |
1801b570 | 245 | sdif, exact_dif); |
645ca708 | 246 | if (score > badness) { |
e94a62f5 | 247 | if (sk->sk_reuseport) { |
b50026b5 HFS |
248 | hash = udp6_ehashfn(net, daddr, hnum, |
249 | saddr, sport); | |
ca065d0c | 250 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 251 | sizeof(struct udphdr)); |
ca065d0c ED |
252 | if (result) |
253 | return result; | |
72289b96 | 254 | } |
ca065d0c ED |
255 | result = sk; |
256 | badness = score; | |
1da177e4 LT |
257 | } |
258 | } | |
1da177e4 LT |
259 | return result; |
260 | } | |
fce82338 | 261 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 262 | |
607c4aaf KK |
263 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
264 | __be16 sport, __be16 dport, | |
645ca708 | 265 | struct udp_table *udptable) |
607c4aaf | 266 | { |
b71d1d42 | 267 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 268 | |
ed7cbbce | 269 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 270 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 271 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
272 | } |
273 | ||
63058308 TH |
274 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
275 | __be16 sport, __be16 dport) | |
276 | { | |
277 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
63058308 | 278 | |
ed7cbbce | 279 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
63058308 | 280 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 281 | inet6_sdif(skb), &udp_table, skb); |
63058308 TH |
282 | } |
283 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); | |
284 | ||
ca065d0c ED |
285 | /* Must be called under rcu_read_lock(). |
286 | * Does increment socket refcount. | |
287 | */ | |
288 | #if IS_ENABLED(CONFIG_NETFILTER_XT_MATCH_SOCKET) || \ | |
30f58158 AB |
289 | IS_ENABLED(CONFIG_NETFILTER_XT_TARGET_TPROXY) || \ |
290 | IS_ENABLED(CONFIG_NF_SOCKET_IPV6) | |
aa976fc0 BS |
291 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
292 | const struct in6_addr *daddr, __be16 dport, int dif) | |
293 | { | |
ca065d0c ED |
294 | struct sock *sk; |
295 | ||
296 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
1801b570 | 297 | dif, 0, &udp_table, NULL); |
41c6d650 | 298 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
299 | sk = NULL; |
300 | return sk; | |
aa976fc0 BS |
301 | } |
302 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 303 | #endif |
aa976fc0 | 304 | |
cb891fa6 PA |
305 | /* do not use the scratch area len for jumbogram: their length execeeds the |
306 | * scratch area space; note that the IP6CB flags is still in the first | |
307 | * cacheline, so checking for jumbograms is cheap | |
308 | */ | |
309 | static int udp6_skb_len(struct sk_buff *skb) | |
310 | { | |
311 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); | |
312 | } | |
313 | ||
1da177e4 | 314 | /* |
67ba4152 IM |
315 | * This should be easy, if there is something there we |
316 | * return it, otherwise we block. | |
1da177e4 LT |
317 | */ |
318 | ||
1b784140 | 319 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
320 | int noblock, int flags, int *addr_len) |
321 | { | |
322 | struct ipv6_pinfo *np = inet6_sk(sk); | |
323 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 324 | struct sk_buff *skb; |
59c2cdae | 325 | unsigned int ulen, copied; |
627d2d6b | 326 | int peeked, peeking, off; |
759e5d00 HX |
327 | int err; |
328 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 329 | bool checksum_valid = false; |
f26ba175 | 330 | int is_udp4; |
1da177e4 | 331 | |
1da177e4 | 332 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 333 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 334 | |
4b340ae2 | 335 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 336 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 337 | |
1da177e4 | 338 | try_again: |
a0917e0b MD |
339 | peeking = flags & MSG_PEEK; |
340 | off = sk_peek_offset(sk, flags); | |
7c13f97f | 341 | skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); |
1da177e4 | 342 | if (!skb) |
627d2d6b | 343 | return err; |
1da177e4 | 344 | |
cb891fa6 | 345 | ulen = udp6_skb_len(skb); |
59c2cdae | 346 | copied = len; |
627d2d6b | 347 | if (copied > ulen - off) |
348 | copied = ulen - off; | |
59c2cdae | 349 | else if (copied < ulen) |
1ab1457c | 350 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 351 | |
f26ba175 WY |
352 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
353 | ||
ba4e58ec | 354 | /* |
759e5d00 HX |
355 | * If checksum is needed at all, try to do it while copying the |
356 | * data. If the data is truncated, or if we only want a partial | |
357 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 358 | */ |
ba4e58ec | 359 | |
d21dbdfe ED |
360 | if (copied < ulen || peeking || |
361 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
67a51780 PA |
362 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
363 | !__udp_lib_checksum_complete(skb); | |
197c949e | 364 | if (!checksum_valid) |
1da177e4 | 365 | goto csum_copy_err; |
ba4e58ec GR |
366 | } |
367 | ||
67a51780 PA |
368 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
369 | if (udp_skb_is_linear(skb)) | |
370 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
371 | else | |
372 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
373 | } else { | |
627d2d6b | 374 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
375 | if (err == -EINVAL) |
376 | goto csum_copy_err; | |
377 | } | |
22911fc5 | 378 | if (unlikely(err)) { |
979402b1 ED |
379 | if (!peeked) { |
380 | atomic_inc(&sk->sk_drops); | |
381 | if (is_udp4) | |
6aef70a8 ED |
382 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
383 | is_udplite); | |
979402b1 | 384 | else |
6aef70a8 ED |
385 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
386 | is_udplite); | |
979402b1 | 387 | } |
850cbadd | 388 | kfree_skb(skb); |
627d2d6b | 389 | return err; |
22911fc5 | 390 | } |
f26ba175 WY |
391 | if (!peeked) { |
392 | if (is_udp4) | |
6aef70a8 ED |
393 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
394 | is_udplite); | |
f26ba175 | 395 | else |
6aef70a8 ED |
396 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
397 | is_udplite); | |
f26ba175 | 398 | } |
cb75994e | 399 | |
3b885787 | 400 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
401 | |
402 | /* Copy the address. */ | |
403 | if (msg->msg_name) { | |
342dfc30 | 404 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 405 | sin6->sin6_family = AF_INET6; |
4bedb452 | 406 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 407 | sin6->sin6_flowinfo = 0; |
1da177e4 | 408 | |
842df073 | 409 | if (is_udp4) { |
b301e82c BH |
410 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
411 | &sin6->sin6_addr); | |
842df073 HFS |
412 | sin6->sin6_scope_id = 0; |
413 | } else { | |
4e3fd7a0 | 414 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
415 | sin6->sin6_scope_id = |
416 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 417 | inet6_iif(skb)); |
1da177e4 | 418 | } |
bceaa902 | 419 | *addr_len = sizeof(*sin6); |
1da177e4 | 420 | } |
4b261c75 HFS |
421 | |
422 | if (np->rxopt.all) | |
423 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
424 | ||
f26ba175 | 425 | if (is_udp4) { |
1da177e4 | 426 | if (inet->cmsg_flags) |
ad959036 | 427 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 428 | sizeof(struct udphdr), off); |
1da177e4 LT |
429 | } else { |
430 | if (np->rxopt.all) | |
4b261c75 | 431 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 432 | } |
1da177e4 | 433 | |
59c2cdae | 434 | err = copied; |
1da177e4 | 435 | if (flags & MSG_TRUNC) |
759e5d00 | 436 | err = ulen; |
1da177e4 | 437 | |
850cbadd | 438 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
439 | return err; |
440 | ||
441 | csum_copy_err: | |
2276f58a PA |
442 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
443 | udp_skb_destructor)) { | |
6a5dc9e5 | 444 | if (is_udp4) { |
6aef70a8 ED |
445 | UDP_INC_STATS(sock_net(sk), |
446 | UDP_MIB_CSUMERRORS, is_udplite); | |
447 | UDP_INC_STATS(sock_net(sk), | |
448 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 449 | } else { |
6aef70a8 ED |
450 | UDP6_INC_STATS(sock_net(sk), |
451 | UDP_MIB_CSUMERRORS, is_udplite); | |
452 | UDP6_INC_STATS(sock_net(sk), | |
453 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 454 | } |
0856f939 | 455 | } |
850cbadd | 456 | kfree_skb(skb); |
1da177e4 | 457 | |
beb39db5 ED |
458 | /* starting over for a new packet, but check if we need to yield */ |
459 | cond_resched(); | |
9cfaa8de | 460 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
461 | goto try_again; |
462 | } | |
463 | ||
ba4e58ec | 464 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 465 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 466 | struct udp_table *udptable) |
1da177e4 LT |
467 | { |
468 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
469 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
470 | const struct in6_addr *saddr = &hdr->saddr; | |
471 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 472 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 473 | struct sock *sk; |
e0d8c1b7 | 474 | int harderr; |
1da177e4 | 475 | int err; |
7304fe46 | 476 | struct net *net = dev_net(skb->dev); |
1da177e4 | 477 | |
e32ea7e7 | 478 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
1801b570 | 479 | inet6_iif(skb), 0, udptable, skb); |
63159f29 | 480 | if (!sk) { |
a16292a0 ED |
481 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
482 | ICMP6_MIB_INERRORS); | |
1da177e4 | 483 | return; |
7304fe46 | 484 | } |
1da177e4 | 485 | |
e0d8c1b7 WW |
486 | harderr = icmpv6_err_convert(type, code, &err); |
487 | np = inet6_sk(sk); | |
488 | ||
93b36cf3 HFS |
489 | if (type == ICMPV6_PKT_TOOBIG) { |
490 | if (!ip6_sk_accept_pmtu(sk)) | |
491 | goto out; | |
81aded24 | 492 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
493 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
494 | harderr = 1; | |
93b36cf3 | 495 | } |
1a462d18 | 496 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 497 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
498 | goto out; |
499 | } | |
81aded24 | 500 | |
e0d8c1b7 WW |
501 | if (!np->recverr) { |
502 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
503 | goto out; | |
504 | } else { | |
1da177e4 | 505 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 506 | } |
b1faf566 | 507 | |
1da177e4 LT |
508 | sk->sk_err = err; |
509 | sk->sk_error_report(sk); | |
510 | out: | |
ca065d0c | 511 | return; |
1da177e4 LT |
512 | } |
513 | ||
a3f96c47 | 514 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
515 | { |
516 | int rc; | |
517 | ||
efe4208f | 518 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 519 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 520 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 521 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
522 | } else { |
523 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 524 | } |
f7ad74fe | 525 | |
850cbadd | 526 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
527 | if (rc < 0) { |
528 | int is_udplite = IS_UDPLITE(sk); | |
529 | ||
530 | /* Note that an ENOMEM error is charged twice */ | |
531 | if (rc == -ENOMEM) | |
e61da9e2 | 532 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 533 | UDP_MIB_RCVBUFERRORS, is_udplite); |
e61da9e2 | 534 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
f7ad74fe BL |
535 | kfree_skb(skb); |
536 | return -1; | |
537 | } | |
850cbadd | 538 | |
f7ad74fe BL |
539 | return 0; |
540 | } | |
541 | ||
ba4e58ec | 542 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 543 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 544 | u8 code, int offset, __be32 info) |
ba4e58ec | 545 | { |
645ca708 | 546 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
547 | } |
548 | ||
d7f3f621 BL |
549 | static struct static_key udpv6_encap_needed __read_mostly; |
550 | void udpv6_encap_enable(void) | |
551 | { | |
7a34bcb8 | 552 | static_key_enable(&udpv6_encap_needed); |
d7f3f621 BL |
553 | } |
554 | EXPORT_SYMBOL(udpv6_encap_enable); | |
555 | ||
a3f96c47 | 556 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 557 | { |
ba4e58ec | 558 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 559 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 560 | |
ba4e58ec GR |
561 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
562 | goto drop; | |
1da177e4 | 563 | |
d7f3f621 BL |
564 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
565 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
566 | ||
567 | /* | |
568 | * This is an encapsulation socket so pass the skb to | |
569 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
570 | * fall through and pass this up the UDP socket. | |
571 | * up->encap_rcv() returns the following value: | |
572 | * =0 if skb was successfully passed to the encap | |
573 | * handler or was discarded by it. | |
574 | * >0 if skb should be passed on to UDP. | |
575 | * <0 if skb should be resubmitted as proto -N | |
576 | */ | |
577 | ||
578 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 579 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 580 | if (encap_rcv) { |
d7f3f621 BL |
581 | int ret; |
582 | ||
0a80966b TH |
583 | /* Verify checksum before giving to encap */ |
584 | if (udp_lib_checksum_complete(skb)) | |
585 | goto csum_error; | |
586 | ||
d7f3f621 BL |
587 | ret = encap_rcv(sk, skb); |
588 | if (ret <= 0) { | |
02c22347 ED |
589 | __UDP_INC_STATS(sock_net(sk), |
590 | UDP_MIB_INDATAGRAMS, | |
591 | is_udplite); | |
d7f3f621 BL |
592 | return -ret; |
593 | } | |
594 | } | |
595 | ||
596 | /* FALLTHROUGH -- it's a UDP Packet */ | |
597 | } | |
598 | ||
ba4e58ec GR |
599 | /* |
600 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
601 | */ | |
b2bf1e26 | 602 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
603 | |
604 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
605 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
606 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
607 | goto drop; |
608 | } | |
609 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
610 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
611 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
612 | goto drop; |
613 | } | |
1da177e4 LT |
614 | } |
615 | ||
4b943fae | 616 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
617 | if (rcu_access_pointer(sk->sk_filter) && |
618 | udp_lib_checksum_complete(skb)) | |
619 | goto csum_error; | |
620 | ||
ba66bbe5 | 621 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
a6127697 | 622 | goto drop; |
ba4e58ec | 623 | |
e6afc8ac | 624 | udp_csum_pull_header(skb); |
cb80ef46 | 625 | |
d826eb14 | 626 | skb_dst_drop(skb); |
cb75994e | 627 | |
850cbadd | 628 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 629 | |
6a5dc9e5 | 630 | csum_error: |
02c22347 | 631 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 632 | drop: |
02c22347 | 633 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 634 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
635 | kfree_skb(skb); |
636 | return -1; | |
1da177e4 LT |
637 | } |
638 | ||
5cf3d461 DH |
639 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
640 | __be16 loc_port, const struct in6_addr *loc_addr, | |
641 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
642 | int dif, unsigned short hnum) | |
1da177e4 | 643 | { |
5cf3d461 | 644 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 645 | |
5cf3d461 DH |
646 | if (!net_eq(sock_net(sk), net)) |
647 | return false; | |
648 | ||
649 | if (udp_sk(sk)->udp_port_hash != hnum || | |
650 | sk->sk_family != PF_INET6 || | |
651 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
652 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
653 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
654 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
655 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
656 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
657 | return false; |
658 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
659 | return false; | |
660 | return true; | |
1da177e4 LT |
661 | } |
662 | ||
4068579e TH |
663 | static void udp6_csum_zero_error(struct sk_buff *skb) |
664 | { | |
665 | /* RFC 2460 section 8.1 says that we SHOULD log | |
666 | * this error. Well, it is reasonable. | |
667 | */ | |
ba7a46f1 JP |
668 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
669 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
670 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
671 | } |
672 | ||
1da177e4 LT |
673 | /* |
674 | * Note: called only from the BH handler context, | |
675 | * so we don't need to lock the hashes. | |
676 | */ | |
e3163493 | 677 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 678 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 679 | struct udp_table *udptable, int proto) |
1da177e4 | 680 | { |
ca065d0c | 681 | struct sock *sk, *first = NULL; |
4bedb452 | 682 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
683 | unsigned short hnum = ntohs(uh->dest); |
684 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 685 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 686 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
687 | int dif = inet6_iif(skb); |
688 | struct hlist_node *node; | |
689 | struct sk_buff *nskb; | |
2dc41cff DH |
690 | |
691 | if (use_hash2) { | |
f0b1e64c | 692 | hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & |
73e2d5e3 | 693 | udptable->mask; |
f0b1e64c | 694 | hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
2dc41cff | 695 | start_lookup: |
73e2d5e3 | 696 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
697 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
698 | } | |
1da177e4 | 699 | |
ca065d0c ED |
700 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
701 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
702 | uh->source, saddr, dif, hnum)) | |
703 | continue; | |
704 | /* If zero checksum and no_check is not on for | |
705 | * the socket then skip it. | |
706 | */ | |
707 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
708 | continue; | |
709 | if (!first) { | |
710 | first = sk; | |
711 | continue; | |
712 | } | |
713 | nskb = skb_clone(skb, GFP_ATOMIC); | |
714 | if (unlikely(!nskb)) { | |
715 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
716 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
717 | IS_UDPLITE(sk)); | |
718 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
719 | IS_UDPLITE(sk)); | |
ca065d0c | 720 | continue; |
95766fff | 721 | } |
a1ab77f9 | 722 | |
ca065d0c ED |
723 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
724 | consume_skb(nskb); | |
725 | } | |
a1ab77f9 | 726 | |
2dc41cff DH |
727 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
728 | if (use_hash2 && hash2 != hash2_any) { | |
729 | hash2 = hash2_any; | |
730 | goto start_lookup; | |
731 | } | |
732 | ||
ca065d0c ED |
733 | if (first) { |
734 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
735 | consume_skb(skb); | |
a1ab77f9 | 736 | } else { |
ca065d0c | 737 | kfree_skb(skb); |
02c22347 ED |
738 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
739 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 740 | } |
ba4e58ec | 741 | return 0; |
1da177e4 LT |
742 | } |
743 | ||
64f0f5d1 PA |
744 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
745 | { | |
746 | if (udp_sk_rx_dst_set(sk, dst)) { | |
747 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
748 | ||
749 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); | |
750 | } | |
751 | } | |
752 | ||
645ca708 | 753 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 754 | int proto) |
1da177e4 | 755 | { |
ca065d0c | 756 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 757 | struct net *net = dev_net(skb->dev); |
1ab1457c | 758 | struct udphdr *uh; |
ca065d0c | 759 | struct sock *sk; |
1da177e4 LT |
760 | u32 ulen = 0; |
761 | ||
762 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 763 | goto discard; |
1da177e4 | 764 | |
0660e03f ACM |
765 | saddr = &ipv6_hdr(skb)->saddr; |
766 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 767 | uh = udp_hdr(skb); |
1da177e4 LT |
768 | |
769 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
770 | if (ulen > skb->len) |
771 | goto short_packet; | |
1da177e4 | 772 | |
759e5d00 HX |
773 | if (proto == IPPROTO_UDP) { |
774 | /* UDP validates ulen. */ | |
1da177e4 | 775 | |
ba4e58ec GR |
776 | /* Check for jumbo payload */ |
777 | if (ulen == 0) | |
778 | ulen = skb->len; | |
1da177e4 | 779 | |
ba4e58ec GR |
780 | if (ulen < sizeof(*uh)) |
781 | goto short_packet; | |
1da177e4 | 782 | |
ba4e58ec GR |
783 | if (ulen < skb->len) { |
784 | if (pskb_trim_rcsum(skb, ulen)) | |
785 | goto short_packet; | |
0660e03f ACM |
786 | saddr = &ipv6_hdr(skb)->saddr; |
787 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 788 | uh = udp_hdr(skb); |
ba4e58ec | 789 | } |
ba4e58ec | 790 | } |
1da177e4 | 791 | |
759e5d00 | 792 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 793 | goto csum_error; |
759e5d00 | 794 | |
c9f2c1ae PA |
795 | /* Check if the socket is already available, e.g. due to early demux */ |
796 | sk = skb_steal_sock(skb); | |
797 | if (sk) { | |
798 | struct dst_entry *dst = skb_dst(skb); | |
799 | int ret; | |
800 | ||
801 | if (unlikely(sk->sk_rx_dst != dst)) | |
64f0f5d1 | 802 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae PA |
803 | |
804 | ret = udpv6_queue_rcv_skb(sk, skb); | |
805 | sock_put(sk); | |
806 | ||
807 | /* a return value > 0 means to resubmit the input */ | |
808 | if (ret > 0) | |
809 | return ret; | |
810 | return 0; | |
811 | } | |
812 | ||
1ab1457c YH |
813 | /* |
814 | * Multicast receive code | |
1da177e4 | 815 | */ |
ba4e58ec | 816 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 817 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 818 | saddr, daddr, udptable, proto); |
1da177e4 LT |
819 | |
820 | /* Unicast */ | |
607c4aaf | 821 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 822 | if (sk) { |
a5b50476 ET |
823 | int ret; |
824 | ||
1c19448c | 825 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
4068579e TH |
826 | udp6_csum_zero_error(skb); |
827 | goto csum_error; | |
828 | } | |
829 | ||
224d019c | 830 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) |
2abb7cdc TH |
831 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, |
832 | ip6_compute_pseudo); | |
833 | ||
a5b50476 | 834 | ret = udpv6_queue_rcv_skb(sk, skb); |
1da177e4 | 835 | |
59dca1d8 | 836 | /* a return value > 0 means to resubmit the input */ |
cb80ef46 | 837 | if (ret > 0) |
59dca1d8 | 838 | return ret; |
1da177e4 | 839 | |
add459aa | 840 | return 0; |
1da177e4 | 841 | } |
1ab1457c | 842 | |
4068579e TH |
843 | if (!uh->check) { |
844 | udp6_csum_zero_error(skb); | |
845 | goto csum_error; | |
846 | } | |
847 | ||
cb80ef46 | 848 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 849 | goto discard; |
cb80ef46 BL |
850 | |
851 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 852 | goto csum_error; |
cb80ef46 | 853 | |
02c22347 | 854 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
855 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
856 | ||
857 | kfree_skb(skb); | |
add459aa | 858 | return 0; |
1da177e4 | 859 | |
1ab1457c | 860 | short_packet: |
ba7a46f1 JP |
861 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
862 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
863 | saddr, ntohs(uh->source), | |
864 | ulen, skb->len, | |
865 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 ED |
866 | goto discard; |
867 | csum_error: | |
02c22347 | 868 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 869 | discard: |
02c22347 | 870 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 871 | kfree_skb(skb); |
add459aa | 872 | return 0; |
1da177e4 | 873 | } |
ba4e58ec | 874 | |
0bd84065 | 875 | |
5425077d | 876 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
877 | __be16 loc_port, const struct in6_addr *loc_addr, | |
878 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 879 | int dif, int sdif) |
5425077d | 880 | { |
0bd84065 | 881 | unsigned short hnum = ntohs(loc_port); |
f0b1e64c | 882 | unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
0bd84065 | 883 | unsigned int slot2 = hash2 & udp_table.mask; |
884 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
885 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); | |
5425077d | 886 | struct sock *sk; |
887 | ||
0bd84065 | 888 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 889 | if (sk->sk_state == TCP_ESTABLISHED && |
4297a0ef | 890 | INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 891 | return sk; |
892 | /* Only check first socket in chain */ | |
893 | break; | |
894 | } | |
895 | return NULL; | |
5425077d | 896 | } |
897 | ||
898 | static void udp_v6_early_demux(struct sk_buff *skb) | |
899 | { | |
900 | struct net *net = dev_net(skb->dev); | |
901 | const struct udphdr *uh; | |
902 | struct sock *sk; | |
903 | struct dst_entry *dst; | |
904 | int dif = skb->dev->ifindex; | |
4297a0ef | 905 | int sdif = inet6_sdif(skb); |
5425077d | 906 | |
907 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
908 | sizeof(struct udphdr))) | |
909 | return; | |
910 | ||
911 | uh = udp_hdr(skb); | |
912 | ||
913 | if (skb->pkt_type == PACKET_HOST) | |
914 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
915 | &ipv6_hdr(skb)->daddr, | |
916 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 917 | dif, sdif); |
5425077d | 918 | else |
919 | return; | |
920 | ||
41c6d650 | 921 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
5425077d | 922 | return; |
923 | ||
924 | skb->sk = sk; | |
925 | skb->destructor = sock_efree; | |
926 | dst = READ_ONCE(sk->sk_rx_dst); | |
927 | ||
928 | if (dst) | |
929 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); | |
930 | if (dst) { | |
d24406c8 WW |
931 | /* set noref for now. |
932 | * any place which wants to hold dst has to call | |
933 | * dst_hold_safe() | |
934 | */ | |
935 | skb_dst_set_noref(skb, dst); | |
5425077d | 936 | } |
937 | } | |
938 | ||
e5bbef20 | 939 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 940 | { |
645ca708 | 941 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
942 | } |
943 | ||
1da177e4 LT |
944 | /* |
945 | * Throw away all pending data and cancel the corking. Socket is locked. | |
946 | */ | |
947 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
948 | { | |
949 | struct udp_sock *up = udp_sk(sk); | |
950 | ||
36d926b9 DL |
951 | if (up->pending == AF_INET) |
952 | udp_flush_pending_frames(sk); | |
953 | else if (up->pending) { | |
1da177e4 LT |
954 | up->len = 0; |
955 | up->pending = 0; | |
956 | ip6_flush_pending_frames(sk); | |
1ab1457c | 957 | } |
1da177e4 LT |
958 | } |
959 | ||
d74bad4e AI |
960 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
961 | int addr_len) | |
962 | { | |
963 | /* The following checks are replicated from __ip6_datagram_connect() | |
964 | * and intended to prevent BPF program called below from accessing | |
965 | * bytes that are out of the bound specified by user in addr_len. | |
966 | */ | |
967 | if (uaddr->sa_family == AF_INET) { | |
968 | if (__ipv6_only_sock(sk)) | |
969 | return -EAFNOSUPPORT; | |
970 | return udp_pre_connect(sk, uaddr, addr_len); | |
971 | } | |
972 | ||
973 | if (addr_len < SIN6_LEN_RFC2133) | |
974 | return -EINVAL; | |
975 | ||
976 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); | |
977 | } | |
978 | ||
493c6be3 | 979 | /** |
67ba4152 IM |
980 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
981 | * @sk: socket we are sending on | |
982 | * @skb: sk_buff containing the filled-in UDP header | |
983 | * (checksum field must be zeroed out) | |
493c6be3 SS |
984 | */ |
985 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
986 | const struct in6_addr *saddr, | |
987 | const struct in6_addr *daddr, int len) | |
988 | { | |
989 | unsigned int offset; | |
990 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 991 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
992 | __wsum csum = 0; |
993 | ||
d39d938c | 994 | if (!frags) { |
493c6be3 SS |
995 | /* Only one fragment on the socket. */ |
996 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
997 | skb->csum_offset = offsetof(struct udphdr, check); | |
998 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
999 | } else { | |
1000 | /* | |
1001 | * HW-checksum won't work as there are two or more | |
1002 | * fragments on the socket so that all csums of sk_buffs | |
1003 | * should be together | |
1004 | */ | |
1005 | offset = skb_transport_offset(skb); | |
1006 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1007 | csum = skb->csum; |
493c6be3 SS |
1008 | |
1009 | skb->ip_summed = CHECKSUM_NONE; | |
1010 | ||
d39d938c VY |
1011 | do { |
1012 | csum = csum_add(csum, frags->csum); | |
1013 | } while ((frags = frags->next)); | |
493c6be3 SS |
1014 | |
1015 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1016 | csum); | |
1017 | if (uh->check == 0) | |
1018 | uh->check = CSUM_MANGLED_0; | |
1019 | } | |
1020 | } | |
1021 | ||
1da177e4 LT |
1022 | /* |
1023 | * Sending | |
1024 | */ | |
1025 | ||
bec1f6f6 WB |
1026 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1027 | struct inet_cork *cork) | |
1da177e4 | 1028 | { |
d39d938c | 1029 | struct sock *sk = skb->sk; |
1da177e4 | 1030 | struct udphdr *uh; |
1da177e4 | 1031 | int err = 0; |
b2bf1e26 | 1032 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1033 | __wsum csum = 0; |
d39d938c VY |
1034 | int offset = skb_transport_offset(skb); |
1035 | int len = skb->len - offset; | |
1da177e4 LT |
1036 | |
1037 | /* | |
1038 | * Create a UDP header | |
1039 | */ | |
4bedb452 | 1040 | uh = udp_hdr(skb); |
1958b856 DM |
1041 | uh->source = fl6->fl6_sport; |
1042 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1043 | uh->len = htons(len); |
1da177e4 LT |
1044 | uh->check = 0; |
1045 | ||
bec1f6f6 WB |
1046 | if (cork->gso_size) { |
1047 | const int hlen = skb_network_header_len(skb) + | |
1048 | sizeof(struct udphdr); | |
1049 | ||
1050 | if (hlen + cork->gso_size > cork->fragsize) | |
1051 | return -EINVAL; | |
1052 | if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) | |
1053 | return -EINVAL; | |
1054 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite) | |
1055 | return -EIO; | |
1056 | ||
1057 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1058 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
1059 | } | |
1060 | ||
b2bf1e26 | 1061 | if (is_udplite) |
d39d938c VY |
1062 | csum = udplite_csum(skb); |
1063 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1064 | skb->ip_summed = CHECKSUM_NONE; |
1065 | goto send; | |
1066 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
d39d938c | 1067 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1068 | goto send; |
1069 | } else | |
d39d938c | 1070 | csum = udp_csum(skb); |
1da177e4 | 1071 | |
ba4e58ec | 1072 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1073 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1074 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1075 | if (uh->check == 0) |
f6ab0288 | 1076 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1077 | |
493c6be3 | 1078 | send: |
d39d938c | 1079 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1080 | if (err) { |
1081 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1082 | UDP6_INC_STATS(sock_net(sk), |
1083 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1084 | err = 0; |
1085 | } | |
6aef70a8 ED |
1086 | } else { |
1087 | UDP6_INC_STATS(sock_net(sk), | |
1088 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1089 | } | |
d39d938c VY |
1090 | return err; |
1091 | } | |
1092 | ||
1093 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1094 | { | |
1095 | struct sk_buff *skb; | |
1096 | struct udp_sock *up = udp_sk(sk); | |
1097 | struct flowi6 fl6; | |
1098 | int err = 0; | |
1099 | ||
1100 | if (up->pending == AF_INET) | |
1101 | return udp_push_pending_frames(sk); | |
1102 | ||
1103 | /* ip6_finish_skb will release the cork, so make a copy of | |
1104 | * fl6 here. | |
1105 | */ | |
1106 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1107 | ||
1108 | skb = ip6_finish_skb(sk); | |
1109 | if (!skb) | |
1110 | goto out; | |
1111 | ||
bec1f6f6 | 1112 | err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); |
d39d938c | 1113 | |
1da177e4 LT |
1114 | out: |
1115 | up->len = 0; | |
1116 | up->pending = 0; | |
1117 | return err; | |
1118 | } | |
1119 | ||
1b784140 | 1120 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1121 | { |
1122 | struct ipv6_txoptions opt_space; | |
1123 | struct udp_sock *up = udp_sk(sk); | |
1124 | struct inet_sock *inet = inet_sk(sk); | |
1125 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1126 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1127 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1128 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1129 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1130 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1131 | struct flowi6 fl6; |
1da177e4 | 1132 | struct dst_entry *dst; |
26879da5 | 1133 | struct ipcm6_cookie ipc6; |
1da177e4 | 1134 | int addr_len = msg->msg_namelen; |
9f542f61 | 1135 | bool connected = false; |
1da177e4 | 1136 | int ulen = len; |
1da177e4 LT |
1137 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1138 | int err; | |
b2bf1e26 | 1139 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1140 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
ad1e46a8 | 1141 | struct sockcm_cookie sockc; |
1da177e4 | 1142 | |
26879da5 WW |
1143 | ipc6.hlimit = -1; |
1144 | ipc6.tclass = -1; | |
1145 | ipc6.dontfrag = -1; | |
bec1f6f6 | 1146 | ipc6.gso_size = up->gso_size; |
d515684d | 1147 | sockc.tsflags = sk->sk_tsflags; |
26879da5 | 1148 | |
1da177e4 LT |
1149 | /* destination address check */ |
1150 | if (sin6) { | |
1151 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1152 | return -EINVAL; | |
1153 | ||
1154 | switch (sin6->sin6_family) { | |
1155 | case AF_INET6: | |
1156 | if (addr_len < SIN6_LEN_RFC2133) | |
1157 | return -EINVAL; | |
1158 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1159 | if (ipv6_addr_any(daddr) && |
1160 | ipv6_addr_v4mapped(&np->saddr)) | |
1161 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1162 | daddr); | |
1da177e4 LT |
1163 | break; |
1164 | case AF_INET: | |
1165 | goto do_udp_sendmsg; | |
1166 | case AF_UNSPEC: | |
1167 | msg->msg_name = sin6 = NULL; | |
1168 | msg->msg_namelen = addr_len = 0; | |
1169 | daddr = NULL; | |
1170 | break; | |
1171 | default: | |
1172 | return -EINVAL; | |
1173 | } | |
1174 | } else if (!up->pending) { | |
1175 | if (sk->sk_state != TCP_ESTABLISHED) | |
1176 | return -EDESTADDRREQ; | |
efe4208f | 1177 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1178 | } else |
1da177e4 LT |
1179 | daddr = NULL; |
1180 | ||
1181 | if (daddr) { | |
e773e4fa | 1182 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1183 | struct sockaddr_in sin; |
1184 | sin.sin_family = AF_INET; | |
c720c7e8 | 1185 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1186 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1187 | msg->msg_name = &sin; | |
1188 | msg->msg_namelen = sizeof(sin); | |
1189 | do_udp_sendmsg: | |
1190 | if (__ipv6_only_sock(sk)) | |
1191 | return -ENETUNREACH; | |
1b784140 | 1192 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1193 | } |
1194 | } | |
1195 | ||
1196 | if (up->pending == AF_INET) | |
1b784140 | 1197 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1198 | |
1199 | /* Rough check on arithmetic overflow, | |
b59e139b | 1200 | better check is made in ip6_append_data(). |
1da177e4 LT |
1201 | */ |
1202 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1203 | return -EMSGSIZE; | |
1ab1457c | 1204 | |
03485f2a | 1205 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1206 | if (up->pending) { |
1207 | /* | |
1208 | * There are pending frames. | |
1209 | * The socket lock must be held while it's corked. | |
1210 | */ | |
1211 | lock_sock(sk); | |
1212 | if (likely(up->pending)) { | |
1213 | if (unlikely(up->pending != AF_INET6)) { | |
1214 | release_sock(sk); | |
1215 | return -EAFNOSUPPORT; | |
1216 | } | |
1217 | dst = NULL; | |
1218 | goto do_append_data; | |
1219 | } | |
1220 | release_sock(sk); | |
1221 | } | |
1222 | ulen += sizeof(struct udphdr); | |
1223 | ||
4c9483b2 | 1224 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1225 | |
1226 | if (sin6) { | |
1227 | if (sin6->sin6_port == 0) | |
1228 | return -EINVAL; | |
1229 | ||
1958b856 | 1230 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1231 | daddr = &sin6->sin6_addr; |
1232 | ||
1233 | if (np->sndflow) { | |
4c9483b2 DM |
1234 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1235 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1236 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1237 | if (!flowlabel) |
1da177e4 | 1238 | return -EINVAL; |
1da177e4 LT |
1239 | } |
1240 | } | |
1241 | ||
1242 | /* | |
1243 | * Otherwise it will be difficult to maintain | |
1244 | * sk->sk_dst_cache. | |
1245 | */ | |
1246 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1247 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1248 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1249 | |
1250 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1251 | sin6->sin6_scope_id && | |
842df073 | 1252 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1253 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1254 | } else { |
1255 | if (sk->sk_state != TCP_ESTABLISHED) | |
1256 | return -EDESTADDRREQ; | |
1257 | ||
1958b856 | 1258 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1259 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1260 | fl6.flowlabel = np->flow_label; |
9f542f61 | 1261 | connected = true; |
1da177e4 LT |
1262 | } |
1263 | ||
4c9483b2 DM |
1264 | if (!fl6.flowi6_oif) |
1265 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1266 | |
4c9483b2 DM |
1267 | if (!fl6.flowi6_oif) |
1268 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1269 | |
4c9483b2 | 1270 | fl6.flowi6_mark = sk->sk_mark; |
e2d118a1 | 1271 | fl6.flowi6_uid = sk->sk_uid; |
51953d5b | 1272 | |
1da177e4 LT |
1273 | if (msg->msg_controllen) { |
1274 | opt = &opt_space; | |
1275 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1276 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1277 | ipc6.opt = opt; |
1da177e4 | 1278 | |
26879da5 | 1279 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6, &sockc); |
1da177e4 LT |
1280 | if (err < 0) { |
1281 | fl6_sock_release(flowlabel); | |
1282 | return err; | |
1283 | } | |
4c9483b2 DM |
1284 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1285 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1286 | if (!flowlabel) |
1da177e4 LT |
1287 | return -EINVAL; |
1288 | } | |
1289 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1290 | opt = NULL; | |
9f542f61 | 1291 | connected = false; |
1da177e4 | 1292 | } |
45f6fad8 ED |
1293 | if (!opt) { |
1294 | opt = txopt_get(np); | |
1295 | opt_to_free = opt; | |
1296 | } | |
df9890c3 YH |
1297 | if (flowlabel) |
1298 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1299 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1300 | ipc6.opt = opt; |
1da177e4 | 1301 | |
4c9483b2 | 1302 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1303 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1304 | fl6.daddr = *daddr; |
876c7f41 | 1305 | else |
4c9483b2 DM |
1306 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1307 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1308 | fl6.saddr = np->saddr; |
1958b856 | 1309 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1310 | |
4c9483b2 | 1311 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1312 | if (final_p) |
9f542f61 | 1313 | connected = false; |
1da177e4 | 1314 | |
4c9483b2 DM |
1315 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1316 | fl6.flowi6_oif = np->mcast_oif; | |
9f542f61 | 1317 | connected = false; |
c4062dfc EH |
1318 | } else if (!fl6.flowi6_oif) |
1319 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1320 | |
4c9483b2 | 1321 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1322 | |
38b7097b HFS |
1323 | if (ipc6.tclass < 0) |
1324 | ipc6.tclass = np->tclass; | |
1325 | ||
1326 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
1327 | ||
4f858c56 | 1328 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); |
68d0c6d3 DM |
1329 | if (IS_ERR(dst)) { |
1330 | err = PTR_ERR(dst); | |
1331 | dst = NULL; | |
1da177e4 | 1332 | goto out; |
14e50e57 | 1333 | } |
1da177e4 | 1334 | |
26879da5 WW |
1335 | if (ipc6.hlimit < 0) |
1336 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 LT |
1337 | |
1338 | if (msg->msg_flags&MSG_CONFIRM) | |
1339 | goto do_confirm; | |
1340 | back_from_confirm: | |
1341 | ||
03485f2a VY |
1342 | /* Lockless fast path for the non-corking case */ |
1343 | if (!corkreq) { | |
1cd7884d | 1344 | struct inet_cork_full cork; |
03485f2a VY |
1345 | struct sk_buff *skb; |
1346 | ||
1347 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1348 | sizeof(struct udphdr), &ipc6, |
03485f2a | 1349 | &fl6, (struct rt6_info *)dst, |
1cd7884d | 1350 | msg->msg_flags, &cork, &sockc); |
03485f2a VY |
1351 | err = PTR_ERR(skb); |
1352 | if (!IS_ERR_OR_NULL(skb)) | |
bec1f6f6 | 1353 | err = udp_v6_send_skb(skb, &fl6, &cork.base); |
4f858c56 | 1354 | goto out; |
03485f2a VY |
1355 | } |
1356 | ||
1da177e4 LT |
1357 | lock_sock(sk); |
1358 | if (unlikely(up->pending)) { | |
1359 | /* The socket is already corked while preparing it. */ | |
1360 | /* ... which is an evident application bug. --ANK */ | |
1361 | release_sock(sk); | |
1362 | ||
ba7a46f1 | 1363 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1364 | err = -EINVAL; |
1365 | goto out; | |
1366 | } | |
1367 | ||
1368 | up->pending = AF_INET6; | |
1369 | ||
1370 | do_append_data: | |
26879da5 WW |
1371 | if (ipc6.dontfrag < 0) |
1372 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1373 | up->len += ulen; |
26879da5 WW |
1374 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
1375 | &ipc6, &fl6, (struct rt6_info *)dst, | |
1376 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, &sockc); | |
1da177e4 LT |
1377 | if (err) |
1378 | udp_v6_flush_pending_frames(sk); | |
1379 | else if (!corkreq) | |
4c0a6cb0 | 1380 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1381 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1382 | up->pending = 0; | |
1da177e4 | 1383 | |
03485f2a VY |
1384 | if (err > 0) |
1385 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1386 | release_sock(sk); | |
1387 | ||
1da177e4 | 1388 | out: |
a3c96089 | 1389 | dst_release(dst); |
1da177e4 | 1390 | fl6_sock_release(flowlabel); |
45f6fad8 | 1391 | txopt_put(opt_to_free); |
cd562c98 | 1392 | if (!err) |
1da177e4 | 1393 | return len; |
a18135eb DM |
1394 | /* |
1395 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1396 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1397 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1398 | * things). We could add another new stat but at least for now that | |
1399 | * seems like overkill. | |
1400 | */ | |
1401 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1402 | UDP6_INC_STATS(sock_net(sk), |
1403 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1404 | } |
1da177e4 LT |
1405 | return err; |
1406 | ||
1407 | do_confirm: | |
0dec879f JA |
1408 | if (msg->msg_flags & MSG_PROBE) |
1409 | dst_confirm_neigh(dst, &fl6.daddr); | |
1da177e4 LT |
1410 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1411 | goto back_from_confirm; | |
1412 | err = 0; | |
1413 | goto out; | |
1414 | } | |
1415 | ||
7d06b2e0 | 1416 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1417 | { |
44046a59 | 1418 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1419 | lock_sock(sk); |
1420 | udp_v6_flush_pending_frames(sk); | |
1421 | release_sock(sk); | |
1422 | ||
44046a59 TP |
1423 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
1424 | void (*encap_destroy)(struct sock *sk); | |
6aa7de05 | 1425 | encap_destroy = READ_ONCE(up->encap_destroy); |
44046a59 TP |
1426 | if (encap_destroy) |
1427 | encap_destroy(sk); | |
1428 | } | |
1429 | ||
1da177e4 | 1430 | inet6_destroy_sock(sk); |
1da177e4 LT |
1431 | } |
1432 | ||
1433 | /* | |
1434 | * Socket option code for UDP | |
1435 | */ | |
ba4e58ec | 1436 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1437 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1438 | { |
db8dac20 | 1439 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1440 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1441 | udp_v6_push_pending_frames); | |
ba4e58ec | 1442 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1443 | } |
1444 | ||
1445 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1446 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1447 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1448 | { |
db8dac20 | 1449 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1450 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1451 | udp_v6_push_pending_frames); | |
ba4e58ec | 1452 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1453 | } |
1454 | #endif | |
1455 | ||
ba4e58ec GR |
1456 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1457 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1458 | { |
db8dac20 | 1459 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1460 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1461 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1462 | } |
1463 | ||
1464 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1465 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1466 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1467 | { |
db8dac20 | 1468 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1469 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1470 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1471 | } |
1472 | #endif | |
1473 | ||
a8e3bb34 DA |
1474 | /* thinking of making this const? Don't. |
1475 | * early_demux can change based on sysctl. | |
1476 | */ | |
dddb64bc | 1477 | static struct inet6_protocol udpv6_protocol = { |
5425077d | 1478 | .early_demux = udp_v6_early_demux, |
dddb64bc | 1479 | .early_demux_handler = udp_v6_early_demux, |
1da177e4 LT |
1480 | .handler = udpv6_rcv, |
1481 | .err_handler = udpv6_err, | |
1482 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1483 | }; | |
1484 | ||
1485 | /* ------------------------------------------------------------------------ */ | |
1486 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1487 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1488 | { |
17ef66af LC |
1489 | if (v == SEQ_START_TOKEN) { |
1490 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1491 | } else { | |
1492 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1493 | struct inet_sock *inet = inet_sk(v); | |
1494 | __u16 srcp = ntohs(inet->inet_sport); | |
1495 | __u16 destp = ntohs(inet->inet_dport); | |
1496 | ip6_dgram_sock_seq_show(seq, v, srcp, destp, bucket); | |
1497 | } | |
1da177e4 LT |
1498 | return 0; |
1499 | } | |
1500 | ||
73cb88ec | 1501 | static const struct file_operations udp6_afinfo_seq_fops = { |
73cb88ec AV |
1502 | .open = udp_seq_open, |
1503 | .read = seq_read, | |
1504 | .llseek = seq_lseek, | |
1505 | .release = seq_release_net | |
1506 | }; | |
1507 | ||
1da177e4 | 1508 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1509 | .name = "udp6", |
1510 | .family = AF_INET6, | |
645ca708 | 1511 | .udp_table = &udp_table, |
73cb88ec | 1512 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1513 | .seq_ops = { |
1514 | .show = udp6_seq_show, | |
1515 | }, | |
1da177e4 LT |
1516 | }; |
1517 | ||
2c8c1e72 | 1518 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1519 | { |
0c96d8c5 | 1520 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1521 | } |
1522 | ||
ec120da6 IM |
1523 | void udp6_proc_exit(struct net *net) |
1524 | { | |
0c96d8c5 | 1525 | udp_proc_unregister(net, &udp6_seq_afinfo); |
1da177e4 LT |
1526 | } |
1527 | #endif /* CONFIG_PROC_FS */ | |
1528 | ||
1529 | /* ------------------------------------------------------------------------ */ | |
1530 | ||
1531 | struct proto udpv6_prot = { | |
1e802951 TZ |
1532 | .name = "UDPv6", |
1533 | .owner = THIS_MODULE, | |
1534 | .close = udp_lib_close, | |
d74bad4e | 1535 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1536 | .connect = ip6_datagram_connect, |
1537 | .disconnect = udp_disconnect, | |
1538 | .ioctl = udp_ioctl, | |
1539 | .init = udp_init_sock, | |
1540 | .destroy = udpv6_destroy_sock, | |
1541 | .setsockopt = udpv6_setsockopt, | |
1542 | .getsockopt = udpv6_getsockopt, | |
1543 | .sendmsg = udpv6_sendmsg, | |
1544 | .recvmsg = udpv6_recvmsg, | |
1545 | .release_cb = ip6_datagram_release_cb, | |
1546 | .hash = udp_lib_hash, | |
1547 | .unhash = udp_lib_unhash, | |
1548 | .rehash = udp_v6_rehash, | |
1549 | .get_port = udp_v6_get_port, | |
1550 | .memory_allocated = &udp_memory_allocated, | |
1551 | .sysctl_mem = sysctl_udp_mem, | |
1552 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), | |
1553 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), | |
1554 | .obj_size = sizeof(struct udp6_sock), | |
1555 | .h.udp_table = &udp_table, | |
3fdadf7d | 1556 | #ifdef CONFIG_COMPAT |
1e802951 TZ |
1557 | .compat_setsockopt = compat_udpv6_setsockopt, |
1558 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1559 | #endif |
1e802951 | 1560 | .diag_destroy = udp_abort, |
1da177e4 LT |
1561 | }; |
1562 | ||
1da177e4 LT |
1563 | static struct inet_protosw udpv6_protosw = { |
1564 | .type = SOCK_DGRAM, | |
1565 | .protocol = IPPROTO_UDP, | |
1566 | .prot = &udpv6_prot, | |
1567 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1568 | .flags = INET_PROTOSW_PERMANENT, |
1569 | }; | |
1570 | ||
7f4e4868 | 1571 | int __init udpv6_init(void) |
1da177e4 | 1572 | { |
7f4e4868 DL |
1573 | int ret; |
1574 | ||
3336288a VY |
1575 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1576 | if (ret) | |
c6b641a4 | 1577 | goto out; |
3336288a | 1578 | |
7f4e4868 DL |
1579 | ret = inet6_register_protosw(&udpv6_protosw); |
1580 | if (ret) | |
1581 | goto out_udpv6_protocol; | |
1582 | out: | |
1583 | return ret; | |
1584 | ||
1585 | out_udpv6_protocol: | |
1586 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1587 | goto out; | |
1588 | } | |
1589 | ||
09f7709f | 1590 | void udpv6_exit(void) |
7f4e4868 DL |
1591 | { |
1592 | inet6_unregister_protosw(&udpv6_protosw); | |
1593 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1594 | } |