Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * UDP over IPv6 | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | * |
9 | * Based on linux/ipv4/udp.c | |
10 | * | |
1da177e4 LT |
11 | * Fixes: |
12 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
13 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
14 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
15 | * a single port at the same time. | |
16 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
17 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
1da177e4 LT |
18 | */ |
19 | ||
aef2feda | 20 | #include <linux/bpf-cgroup.h> |
1da177e4 LT |
21 | #include <linux/errno.h> |
22 | #include <linux/types.h> | |
23 | #include <linux/socket.h> | |
24 | #include <linux/sockios.h> | |
1da177e4 LT |
25 | #include <linux/net.h> |
26 | #include <linux/in6.h> | |
27 | #include <linux/netdevice.h> | |
28 | #include <linux/if_arp.h> | |
29 | #include <linux/ipv6.h> | |
30 | #include <linux/icmpv6.h> | |
31 | #include <linux/init.h> | |
1781f7f5 | 32 | #include <linux/module.h> |
3305b80c | 33 | #include <linux/skbuff.h> |
5a0e3ad6 | 34 | #include <linux/slab.h> |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
0e219ae4 | 36 | #include <linux/indirect_call_wrapper.h> |
1da177e4 | 37 | |
496611d7 | 38 | #include <net/addrconf.h> |
1da177e4 LT |
39 | #include <net/ndisc.h> |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/ip6_route.h> | |
1da177e4 | 43 | #include <net/raw.h> |
222a011e | 44 | #include <net/seg6.h> |
c752f073 | 45 | #include <net/tcp_states.h> |
1da177e4 | 46 | #include <net/ip6_checksum.h> |
e7cc0824 | 47 | #include <net/ip6_tunnel.h> |
8139dccd | 48 | #include <trace/events/udp.h> |
1da177e4 | 49 | #include <net/xfrm.h> |
0bd84065 | 50 | #include <net/inet_hashtables.h> |
72289b96 | 51 | #include <net/inet6_hashtables.h> |
076bb0c8 | 52 | #include <net/busy_poll.h> |
e32ea7e7 | 53 | #include <net/sock_reuseport.h> |
7938cd15 | 54 | #include <net/gro.h> |
1da177e4 LT |
55 | |
56 | #include <linux/proc_fs.h> | |
57 | #include <linux/seq_file.h> | |
22911fc5 | 58 | #include <trace/events/skb.h> |
ba4e58ec | 59 | #include "udp_impl.h" |
1da177e4 | 60 | |
d38afeec KI |
61 | static void udpv6_destruct_sock(struct sock *sk) |
62 | { | |
63 | udp_destruct_common(sk); | |
64 | inet6_sock_destruct(sk); | |
65 | } | |
66 | ||
67 | int udpv6_init_sock(struct sock *sk) | |
68 | { | |
8a3854c7 | 69 | udp_lib_init_sock(sk); |
d38afeec | 70 | sk->sk_destruct = udpv6_destruct_sock; |
8f279fb0 | 71 | set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); |
d38afeec KI |
72 | return 0; |
73 | } | |
74 | ||
0f495f76 LB |
75 | INDIRECT_CALLABLE_SCOPE |
76 | u32 udp6_ehashfn(const struct net *net, | |
77 | const struct in6_addr *laddr, | |
78 | const u16 lport, | |
79 | const struct in6_addr *faddr, | |
80 | const __be16 fport) | |
b50026b5 | 81 | { |
1bbdceef HFS |
82 | u32 lhash, fhash; |
83 | ||
84 | net_get_random_once(&udp6_ehash_secret, | |
85 | sizeof(udp6_ehash_secret)); | |
86 | net_get_random_once(&udp_ipv6_hash_secret, | |
87 | sizeof(udp_ipv6_hash_secret)); | |
88 | ||
89 | lhash = (__force u32)laddr->s6_addr32[3]; | |
90 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
91 | ||
b50026b5 | 92 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
51d03e2f | 93 | udp6_ehash_secret + net_hash_mix(net)); |
b50026b5 HFS |
94 | } |
95 | ||
6ba5a3c5 | 96 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 97 | { |
30fff923 | 98 | unsigned int hash2_nulladdr = |
f0b1e64c | 99 | ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
9a52e97e | 100 | unsigned int hash2_partial = |
f0b1e64c | 101 | ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 102 | |
d4cada4a | 103 | /* precompute partial secondary hash */ |
30fff923 | 104 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 105 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
1da177e4 LT |
106 | } |
107 | ||
f7c46156 | 108 | void udp_v6_rehash(struct sock *sk) |
719f8358 | 109 | { |
f0b1e64c | 110 | u16 new_hash = ipv6_portaddr_hash(sock_net(sk), |
efe4208f | 111 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
112 | inet_sk(sk)->inet_num); |
113 | ||
114 | udp_lib_rehash(sk, new_hash); | |
115 | } | |
116 | ||
d1e37288 SX |
117 | static int compute_score(struct sock *sk, struct net *net, |
118 | const struct in6_addr *saddr, __be16 sport, | |
119 | const struct in6_addr *daddr, unsigned short hnum, | |
73545373 | 120 | int dif, int sdif) |
645ca708 | 121 | { |
4c971d2f | 122 | int bound_dev_if, score; |
60c04aec | 123 | struct inet_sock *inet; |
6da5b0f0 | 124 | bool dev_match; |
60c04aec JP |
125 | |
126 | if (!net_eq(sock_net(sk), net) || | |
127 | udp_sk(sk)->udp_port_hash != hnum || | |
128 | sk->sk_family != PF_INET6) | |
129 | return -1; | |
130 | ||
23b0269e PO |
131 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
132 | return -1; | |
133 | ||
60c04aec JP |
134 | score = 0; |
135 | inet = inet_sk(sk); | |
136 | ||
137 | if (inet->inet_dport) { | |
138 | if (inet->inet_dport != sport) | |
139 | return -1; | |
140 | score++; | |
141 | } | |
142 | ||
60c04aec JP |
143 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
144 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
145 | return -1; | |
146 | score++; | |
147 | } | |
148 | ||
4c971d2f ED |
149 | bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
150 | dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); | |
6da5b0f0 MM |
151 | if (!dev_match) |
152 | return -1; | |
4c971d2f | 153 | if (bound_dev_if) |
8d6c414c | 154 | score++; |
60c04aec | 155 | |
7170a977 | 156 | if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) |
70da268b ED |
157 | score++; |
158 | ||
645ca708 ED |
159 | return score; |
160 | } | |
161 | ||
d1e37288 | 162 | /* called with rcu_read_lock() */ |
fddc17de ED |
163 | static struct sock *udp6_lib_lookup2(struct net *net, |
164 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 | 165 | const struct in6_addr *daddr, unsigned int hnum, |
73545373 TB |
166 | int dif, int sdif, struct udp_hslot *hslot2, |
167 | struct sk_buff *skb) | |
fddc17de ED |
168 | { |
169 | struct sock *sk, *result; | |
e94a62f5 | 170 | int score, badness; |
fddc17de | 171 | |
fddc17de ED |
172 | result = NULL; |
173 | badness = -1; | |
ca065d0c | 174 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 175 | score = compute_score(sk, net, saddr, sport, |
73545373 | 176 | daddr, hnum, dif, sdif); |
fddc17de | 177 | if (score > badness) { |
f0ea27e7 | 178 | badness = score; |
0f495f76 LB |
179 | |
180 | if (sk->sk_state == TCP_ESTABLISHED) { | |
181 | result = sk; | |
182 | continue; | |
183 | } | |
184 | ||
185 | result = inet6_lookup_reuseport(net, sk, skb, sizeof(struct udphdr), | |
186 | saddr, sport, daddr, hnum, udp6_ehashfn); | |
f0ea27e7 LB |
187 | if (!result) { |
188 | result = sk; | |
189 | continue; | |
190 | } | |
191 | ||
a57066b1 | 192 | /* Fall back to scoring if group has connections */ |
f0ea27e7 | 193 | if (!reuseport_has_conns(sk)) |
2a08748c JS |
194 | return result; |
195 | ||
f0ea27e7 LB |
196 | /* Reuseport logic returned an error, keep original score. */ |
197 | if (IS_ERR(result)) | |
198 | continue; | |
199 | ||
200 | badness = compute_score(sk, net, saddr, sport, | |
201 | daddr, hnum, dif, sdif); | |
fddc17de ED |
202 | } |
203 | } | |
fddc17de ED |
204 | return result; |
205 | } | |
206 | ||
ca065d0c | 207 | /* rcu_read_lock() must be held */ |
fce82338 | 208 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
209 | const struct in6_addr *saddr, __be16 sport, |
210 | const struct in6_addr *daddr, __be16 dport, | |
211 | int dif, int sdif, struct udp_table *udptable, | |
212 | struct sk_buff *skb) | |
1da177e4 | 213 | { |
1da177e4 | 214 | unsigned short hnum = ntohs(dport); |
23b0269e PO |
215 | unsigned int hash2, slot2; |
216 | struct udp_hslot *hslot2; | |
6d4201b1 | 217 | struct sock *result, *sk; |
645ca708 | 218 | |
23b0269e PO |
219 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
220 | slot2 = hash2 & udptable->mask; | |
221 | hslot2 = &udptable->hash2[slot2]; | |
222 | ||
6d4201b1 | 223 | /* Lookup connected or non-wildcard sockets */ |
23b0269e | 224 | result = udp6_lib_lookup2(net, saddr, sport, |
73545373 | 225 | daddr, hnum, dif, sdif, |
23b0269e | 226 | hslot2, skb); |
6d4201b1 JS |
227 | if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) |
228 | goto done; | |
229 | ||
230 | /* Lookup redirect from BPF */ | |
6c886db2 LB |
231 | if (static_branch_unlikely(&bpf_sk_lookup_enabled) && |
232 | udptable == net->ipv4.udp_table) { | |
233 | sk = inet6_lookup_run_sk_lookup(net, IPPROTO_UDP, skb, sizeof(struct udphdr), | |
234 | saddr, sport, daddr, hnum, dif, | |
235 | udp6_ehashfn); | |
6d4201b1 JS |
236 | if (sk) { |
237 | result = sk; | |
238 | goto done; | |
239 | } | |
240 | } | |
23b0269e | 241 | |
6d4201b1 JS |
242 | /* Got non-wildcard socket or error on first lookup */ |
243 | if (result) | |
244 | goto done; | |
fddc17de | 245 | |
6d4201b1 JS |
246 | /* Lookup wildcard sockets */ |
247 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); | |
248 | slot2 = hash2 & udptable->mask; | |
249 | hslot2 = &udptable->hash2[slot2]; | |
250 | ||
251 | result = udp6_lib_lookup2(net, saddr, sport, | |
252 | &in6addr_any, hnum, dif, sdif, | |
253 | hslot2, skb); | |
254 | done: | |
26f8113c | 255 | if (IS_ERR(result)) |
23b0269e | 256 | return NULL; |
1da177e4 LT |
257 | return result; |
258 | } | |
fce82338 | 259 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 260 | |
607c4aaf KK |
261 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
262 | __be16 sport, __be16 dport, | |
645ca708 | 263 | struct udp_table *udptable) |
607c4aaf | 264 | { |
b71d1d42 | 265 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 266 | |
ed7cbbce | 267 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 268 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 269 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
270 | } |
271 | ||
7b58e63e | 272 | struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, |
63058308 TH |
273 | __be16 sport, __be16 dport) |
274 | { | |
5ef31ea5 RG |
275 | const u16 offset = NAPI_GRO_CB(skb)->network_offsets[skb->encapsulation]; |
276 | const struct ipv6hdr *iph = (struct ipv6hdr *)(skb->data + offset); | |
ba6aac15 | 277 | struct net *net = dev_net(skb->dev); |
7938cd15 RG |
278 | int iif, sdif; |
279 | ||
280 | inet6_get_iif_sdif(skb, &iif, &sdif); | |
63058308 | 281 | |
ba6aac15 | 282 | return __udp6_lib_lookup(net, &iph->saddr, sport, |
7938cd15 RG |
283 | &iph->daddr, dport, iif, |
284 | sdif, net->ipv4.udp_table, NULL); | |
63058308 | 285 | } |
63058308 | 286 | |
ca065d0c ED |
287 | /* Must be called under rcu_read_lock(). |
288 | * Does increment socket refcount. | |
289 | */ | |
6e86000c | 290 | #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || 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, | |
ba6aac15 | 297 | dif, 0, net->ipv4.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, |
ec095263 | 320 | int flags, int *addr_len) |
1da177e4 LT |
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; |
fd69c399 | 326 | int off, err, peeking = flags & MSG_PEEK; |
759e5d00 | 327 | int is_udplite = IS_UDPLITE(sk); |
543fc3fb | 328 | struct udp_mib __percpu *mib; |
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 | 339 | off = sk_peek_offset(sk, flags); |
ec095263 | 340 | skb = __skb_recv_udp(sk, flags, &off, &err); |
1da177e4 | 341 | if (!skb) |
627d2d6b | 342 | return err; |
1da177e4 | 343 | |
cb891fa6 | 344 | ulen = udp6_skb_len(skb); |
59c2cdae | 345 | copied = len; |
627d2d6b | 346 | if (copied > ulen - off) |
347 | copied = ulen - off; | |
59c2cdae | 348 | else if (copied < ulen) |
1ab1457c | 349 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 350 | |
f26ba175 | 351 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
029a3743 | 352 | mib = __UDPX_MIB(sk, is_udp4); |
f26ba175 | 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)) { |
fd69c399 | 379 | if (!peeking) { |
979402b1 | 380 | atomic_inc(&sk->sk_drops); |
029a3743 | 381 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); |
979402b1 | 382 | } |
850cbadd | 383 | kfree_skb(skb); |
627d2d6b | 384 | return err; |
22911fc5 | 385 | } |
fd69c399 | 386 | if (!peeking) |
029a3743 | 387 | SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); |
cb75994e | 388 | |
6fd1d51c | 389 | sock_recv_cmsgs(msg, sk, skb); |
1da177e4 LT |
390 | |
391 | /* Copy the address. */ | |
392 | if (msg->msg_name) { | |
342dfc30 | 393 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 394 | sin6->sin6_family = AF_INET6; |
4bedb452 | 395 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 396 | sin6->sin6_flowinfo = 0; |
1da177e4 | 397 | |
842df073 | 398 | if (is_udp4) { |
b301e82c BH |
399 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
400 | &sin6->sin6_addr); | |
842df073 HFS |
401 | sin6->sin6_scope_id = 0; |
402 | } else { | |
4e3fd7a0 | 403 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
404 | sin6->sin6_scope_id = |
405 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 406 | inet6_iif(skb)); |
1da177e4 | 407 | } |
bceaa902 | 408 | *addr_len = sizeof(*sin6); |
983695fa | 409 | |
a9ed15da | 410 | BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, |
fefba7d1 DDM |
411 | (struct sockaddr *)sin6, |
412 | addr_len); | |
1da177e4 | 413 | } |
4b261c75 | 414 | |
e1dc0615 | 415 | if (udp_test_bit(GRO_ENABLED, sk)) |
bcd1665e PA |
416 | udp_cmsg_recv(msg, sk, skb); |
417 | ||
4b261c75 HFS |
418 | if (np->rxopt.all) |
419 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
420 | ||
f26ba175 | 421 | if (is_udp4) { |
c274af22 | 422 | if (inet_cmsg_flags(inet)) |
ad959036 | 423 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 424 | sizeof(struct udphdr), off); |
1da177e4 LT |
425 | } else { |
426 | if (np->rxopt.all) | |
4b261c75 | 427 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 428 | } |
1da177e4 | 429 | |
59c2cdae | 430 | err = copied; |
1da177e4 | 431 | if (flags & MSG_TRUNC) |
759e5d00 | 432 | err = ulen; |
1da177e4 | 433 | |
850cbadd | 434 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
435 | return err; |
436 | ||
437 | csum_copy_err: | |
2276f58a PA |
438 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
439 | udp_skb_destructor)) { | |
029a3743 PA |
440 | SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); |
441 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); | |
0856f939 | 442 | } |
850cbadd | 443 | kfree_skb(skb); |
1da177e4 | 444 | |
beb39db5 ED |
445 | /* starting over for a new packet, but check if we need to yield */ |
446 | cond_resched(); | |
9cfaa8de | 447 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
448 | goto try_again; |
449 | } | |
450 | ||
3d010c80 | 451 | DECLARE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
a36e185e SB |
452 | void udpv6_encap_enable(void) |
453 | { | |
9c480601 | 454 | static_branch_inc(&udpv6_encap_needed_key); |
a36e185e SB |
455 | } |
456 | EXPORT_SYMBOL(udpv6_encap_enable); | |
457 | ||
e7cc0824 SB |
458 | /* Handler for tunnels with arbitrary destination ports: no socket lookup, go |
459 | * through error handlers in encapsulations looking for a match. | |
460 | */ | |
461 | static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, | |
462 | struct inet6_skb_parm *opt, | |
424a7cd0 | 463 | u8 type, u8 code, int offset, __be32 info) |
e7cc0824 SB |
464 | { |
465 | int i; | |
466 | ||
467 | for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { | |
468 | int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
424a7cd0 PA |
469 | u8 type, u8 code, int offset, __be32 info); |
470 | const struct ip6_tnl_encap_ops *encap; | |
e7cc0824 | 471 | |
424a7cd0 PA |
472 | encap = rcu_dereference(ip6tun_encaps[i]); |
473 | if (!encap) | |
e7cc0824 | 474 | continue; |
424a7cd0 | 475 | handler = encap->err_handler; |
e7cc0824 SB |
476 | if (handler && !handler(skb, opt, type, code, offset, info)) |
477 | return 0; | |
478 | } | |
479 | ||
480 | return -ENOENT; | |
481 | } | |
482 | ||
a36e185e SB |
483 | /* Try to match ICMP errors to UDP tunnels by looking up a socket without |
484 | * reversing source and destination port: this will match tunnels that force the | |
485 | * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that | |
486 | * lwtunnels might actually break this assumption by being configured with | |
487 | * different destination ports on endpoints, in this case we won't be able to | |
488 | * trace ICMP messages back to them. | |
489 | * | |
e7cc0824 SB |
490 | * If this doesn't match any socket, probe tunnels with arbitrary destination |
491 | * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port | |
492 | * we've sent packets to won't necessarily match the local destination port. | |
493 | * | |
a36e185e SB |
494 | * Then ask the tunnel implementation to match the error against a valid |
495 | * association. | |
496 | * | |
e7cc0824 SB |
497 | * Return an error if we can't find a match, the socket if we need further |
498 | * processing, zero otherwise. | |
a36e185e SB |
499 | */ |
500 | static struct sock *__udp6_lib_err_encap(struct net *net, | |
501 | const struct ipv6hdr *hdr, int offset, | |
502 | struct udphdr *uh, | |
503 | struct udp_table *udptable, | |
9bfce73c | 504 | struct sock *sk, |
e7cc0824 SB |
505 | struct sk_buff *skb, |
506 | struct inet6_skb_parm *opt, | |
507 | u8 type, u8 code, __be32 info) | |
a36e185e | 508 | { |
9bfce73c | 509 | int (*lookup)(struct sock *sk, struct sk_buff *skb); |
a36e185e | 510 | int network_offset, transport_offset; |
9bfce73c | 511 | struct udp_sock *up; |
a36e185e | 512 | |
a36e185e SB |
513 | network_offset = skb_network_offset(skb); |
514 | transport_offset = skb_transport_offset(skb); | |
515 | ||
516 | /* Network header needs to point to the outer IPv6 header inside ICMP */ | |
517 | skb_reset_network_header(skb); | |
518 | ||
519 | /* Transport header needs to point to the UDP header */ | |
520 | skb_set_transport_header(skb, offset); | |
521 | ||
9bfce73c VF |
522 | if (sk) { |
523 | up = udp_sk(sk); | |
524 | ||
525 | lookup = READ_ONCE(up->encap_err_lookup); | |
526 | if (lookup && lookup(sk, skb)) | |
527 | sk = NULL; | |
528 | ||
529 | goto out; | |
530 | } | |
531 | ||
e7cc0824 SB |
532 | sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, |
533 | &hdr->saddr, uh->dest, | |
534 | inet6_iif(skb), 0, udptable, skb); | |
535 | if (sk) { | |
9bfce73c | 536 | up = udp_sk(sk); |
e7cc0824 SB |
537 | |
538 | lookup = READ_ONCE(up->encap_err_lookup); | |
539 | if (!lookup || lookup(sk, skb)) | |
540 | sk = NULL; | |
541 | } | |
542 | ||
9bfce73c | 543 | out: |
e7cc0824 SB |
544 | if (!sk) { |
545 | sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, | |
546 | offset, info)); | |
547 | } | |
a36e185e SB |
548 | |
549 | skb_set_transport_header(skb, transport_offset); | |
550 | skb_set_network_header(skb, network_offset); | |
e7cc0824 | 551 | |
a36e185e SB |
552 | return sk; |
553 | } | |
554 | ||
32bbd879 SB |
555 | int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
556 | u8 type, u8 code, int offset, __be32 info, | |
557 | struct udp_table *udptable) | |
1da177e4 LT |
558 | { |
559 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
560 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
561 | const struct in6_addr *saddr = &hdr->saddr; | |
222a011e | 562 | const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; |
67ba4152 | 563 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
a36e185e | 564 | bool tunnel = false; |
1da177e4 | 565 | struct sock *sk; |
e0d8c1b7 | 566 | int harderr; |
1da177e4 | 567 | int err; |
7304fe46 | 568 | struct net *net = dev_net(skb->dev); |
1da177e4 | 569 | |
e32ea7e7 | 570 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
4ac30c4b | 571 | inet6_iif(skb), inet6_sdif(skb), udptable, NULL); |
9bfce73c | 572 | |
70a36f57 | 573 | if (!sk || READ_ONCE(udp_sk(sk)->encap_type)) { |
a36e185e SB |
574 | /* No socket for error: try tunnels before discarding */ |
575 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { | |
576 | sk = __udp6_lib_err_encap(net, hdr, offset, uh, | |
9bfce73c | 577 | udptable, sk, skb, |
e7cc0824 SB |
578 | opt, type, code, info); |
579 | if (!sk) | |
580 | return 0; | |
9bfce73c VF |
581 | } else |
582 | sk = ERR_PTR(-ENOENT); | |
a36e185e | 583 | |
e7cc0824 | 584 | if (IS_ERR(sk)) { |
a36e185e SB |
585 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
586 | ICMP6_MIB_INERRORS); | |
e7cc0824 | 587 | return PTR_ERR(sk); |
a36e185e | 588 | } |
e7cc0824 | 589 | |
a36e185e | 590 | tunnel = true; |
7304fe46 | 591 | } |
1da177e4 | 592 | |
e0d8c1b7 WW |
593 | harderr = icmpv6_err_convert(type, code, &err); |
594 | np = inet6_sk(sk); | |
595 | ||
93b36cf3 HFS |
596 | if (type == ICMPV6_PKT_TOOBIG) { |
597 | if (!ip6_sk_accept_pmtu(sk)) | |
598 | goto out; | |
81aded24 | 599 | ip6_sk_update_pmtu(skb, sk, info); |
6b724bc4 | 600 | if (READ_ONCE(np->pmtudisc) != IPV6_PMTUDISC_DONT) |
e0d8c1b7 | 601 | harderr = 1; |
93b36cf3 | 602 | } |
1a462d18 | 603 | if (type == NDISC_REDIRECT) { |
a36e185e SB |
604 | if (tunnel) { |
605 | ip6_redirect(skb, sock_net(sk), inet6_iif(skb), | |
3c5b4d69 | 606 | READ_ONCE(sk->sk_mark), sk->sk_uid); |
a36e185e SB |
607 | } else { |
608 | ip6_sk_redirect(skb, sk); | |
609 | } | |
1a462d18 DJ |
610 | goto out; |
611 | } | |
81aded24 | 612 | |
a36e185e | 613 | /* Tunnels don't have an application socket: don't pass errors back */ |
ac56a0b4 DH |
614 | if (tunnel) { |
615 | if (udp_sk(sk)->encap_err_rcv) | |
42fb06b3 DH |
616 | udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, |
617 | ntohl(info), (u8 *)(uh+1)); | |
a36e185e | 618 | goto out; |
ac56a0b4 | 619 | } |
a36e185e | 620 | |
3fa29971 | 621 | if (!inet6_test_bit(RECVERR6, sk)) { |
e0d8c1b7 WW |
622 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) |
623 | goto out; | |
624 | } else { | |
1da177e4 | 625 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 626 | } |
b1faf566 | 627 | |
1da177e4 | 628 | sk->sk_err = err; |
e3ae2365 | 629 | sk_error_report(sk); |
1da177e4 | 630 | out: |
32bbd879 | 631 | return 0; |
1da177e4 LT |
632 | } |
633 | ||
a3f96c47 | 634 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
635 | { |
636 | int rc; | |
637 | ||
efe4208f | 638 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 639 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 640 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 641 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
642 | } else { |
643 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 644 | } |
f7ad74fe | 645 | |
850cbadd | 646 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
647 | if (rc < 0) { |
648 | int is_udplite = IS_UDPLITE(sk); | |
0d92efde | 649 | enum skb_drop_reason drop_reason; |
f7ad74fe BL |
650 | |
651 | /* Note that an ENOMEM error is charged twice */ | |
0d92efde | 652 | if (rc == -ENOMEM) { |
e61da9e2 | 653 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 654 | UDP_MIB_RCVBUFERRORS, is_udplite); |
0d92efde DH |
655 | drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; |
656 | } else { | |
a3ce2b10 MD |
657 | UDP6_INC_STATS(sock_net(sk), |
658 | UDP_MIB_MEMERRORS, is_udplite); | |
0d92efde DH |
659 | drop_reason = SKB_DROP_REASON_PROTO_MEM; |
660 | } | |
e61da9e2 | 661 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
0d92efde | 662 | kfree_skb_reason(skb, drop_reason); |
8139dccd | 663 | trace_udp_fail_queue_rcv_skb(rc, sk); |
f7ad74fe BL |
664 | return -1; |
665 | } | |
850cbadd | 666 | |
f7ad74fe BL |
667 | return 0; |
668 | } | |
669 | ||
32bbd879 SB |
670 | static __inline__ int udpv6_err(struct sk_buff *skb, |
671 | struct inet6_skb_parm *opt, u8 type, | |
672 | u8 code, int offset, __be32 info) | |
ba4e58ec | 673 | { |
ba6aac15 KI |
674 | return __udp6_lib_err(skb, opt, type, code, offset, info, |
675 | dev_net(skb->dev)->ipv4.udp_table); | |
ba4e58ec GR |
676 | } |
677 | ||
cf329aa4 | 678 | static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 679 | { |
0d92efde | 680 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ba4e58ec | 681 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 682 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 683 | |
0d92efde DH |
684 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
685 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
ba4e58ec | 686 | goto drop; |
0d92efde | 687 | } |
b0e214d2 | 688 | nf_reset_ct(skb); |
1da177e4 | 689 | |
70a36f57 ED |
690 | if (static_branch_unlikely(&udpv6_encap_needed_key) && |
691 | READ_ONCE(up->encap_type)) { | |
d7f3f621 BL |
692 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
693 | ||
694 | /* | |
695 | * This is an encapsulation socket so pass the skb to | |
696 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
697 | * fall through and pass this up the UDP socket. | |
698 | * up->encap_rcv() returns the following value: | |
699 | * =0 if skb was successfully passed to the encap | |
700 | * handler or was discarded by it. | |
701 | * >0 if skb should be passed on to UDP. | |
702 | * <0 if skb should be resubmitted as proto -N | |
703 | */ | |
704 | ||
705 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 706 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 707 | if (encap_rcv) { |
d7f3f621 BL |
708 | int ret; |
709 | ||
0a80966b TH |
710 | /* Verify checksum before giving to encap */ |
711 | if (udp_lib_checksum_complete(skb)) | |
712 | goto csum_error; | |
713 | ||
d7f3f621 BL |
714 | ret = encap_rcv(sk, skb); |
715 | if (ret <= 0) { | |
250962e4 MD |
716 | __UDP6_INC_STATS(sock_net(sk), |
717 | UDP_MIB_INDATAGRAMS, | |
718 | is_udplite); | |
d7f3f621 BL |
719 | return -ret; |
720 | } | |
721 | } | |
722 | ||
723 | /* FALLTHROUGH -- it's a UDP Packet */ | |
724 | } | |
725 | ||
ba4e58ec GR |
726 | /* |
727 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
728 | */ | |
882af43a ED |
729 | if (udp_test_bit(UDPLITE_RECV_CC, sk) && UDP_SKB_CB(skb)->partial_cov) { |
730 | u16 pcrlen = READ_ONCE(up->pcrlen); | |
ba4e58ec | 731 | |
882af43a | 732 | if (pcrlen == 0) { /* full coverage was set */ |
ba7a46f1 JP |
733 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
734 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
735 | goto drop; |
736 | } | |
882af43a | 737 | if (UDP_SKB_CB(skb)->cscov < pcrlen) { |
ba7a46f1 | 738 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
882af43a | 739 | UDP_SKB_CB(skb)->cscov, pcrlen); |
ba4e58ec GR |
740 | goto drop; |
741 | } | |
1da177e4 LT |
742 | } |
743 | ||
4b943fae | 744 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
745 | if (rcu_access_pointer(sk->sk_filter) && |
746 | udp_lib_checksum_complete(skb)) | |
747 | goto csum_error; | |
748 | ||
0d92efde DH |
749 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { |
750 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
a6127697 | 751 | goto drop; |
0d92efde | 752 | } |
ba4e58ec | 753 | |
e6afc8ac | 754 | udp_csum_pull_header(skb); |
cb80ef46 | 755 | |
d826eb14 | 756 | skb_dst_drop(skb); |
cb75994e | 757 | |
850cbadd | 758 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 759 | |
6a5dc9e5 | 760 | csum_error: |
0d92efde | 761 | drop_reason = SKB_DROP_REASON_UDP_CSUM; |
02c22347 | 762 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 763 | drop: |
02c22347 | 764 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 765 | atomic_inc(&sk->sk_drops); |
0d92efde | 766 | kfree_skb_reason(skb, drop_reason); |
ba4e58ec | 767 | return -1; |
1da177e4 LT |
768 | } |
769 | ||
cf329aa4 PA |
770 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
771 | { | |
772 | struct sk_buff *next, *segs; | |
773 | int ret; | |
774 | ||
775 | if (likely(!udp_unexpected_gso(sk, skb))) | |
776 | return udpv6_queue_rcv_one_skb(sk, skb); | |
777 | ||
778 | __skb_push(skb, -skb_mac_offset(skb)); | |
779 | segs = udp_rcv_segment(sk, skb, false); | |
1a186c14 | 780 | skb_list_walk_safe(segs, skb, next) { |
cf329aa4 PA |
781 | __skb_pull(skb, skb_transport_offset(skb)); |
782 | ||
000ac44d | 783 | udp_post_segment_fix_csum(skb); |
cf329aa4 PA |
784 | ret = udpv6_queue_rcv_one_skb(sk, skb); |
785 | if (ret > 0) | |
786 | ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, | |
787 | true); | |
788 | } | |
789 | return 0; | |
790 | } | |
791 | ||
dc3731ba | 792 | static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk, |
5cf3d461 DH |
793 | __be16 loc_port, const struct in6_addr *loc_addr, |
794 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
7bd2db40 | 795 | int dif, int sdif, unsigned short hnum) |
1da177e4 | 796 | { |
dc3731ba | 797 | const struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 798 | |
5cf3d461 DH |
799 | if (!net_eq(sock_net(sk), net)) |
800 | return false; | |
801 | ||
802 | if (udp_sk(sk)->udp_port_hash != hnum || | |
803 | sk->sk_family != PF_INET6 || | |
804 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
805 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
806 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
4c971d2f | 807 | !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || |
33b4b015 HR |
808 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
809 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
810 | return false; |
811 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
812 | return false; | |
813 | return true; | |
1da177e4 LT |
814 | } |
815 | ||
4068579e TH |
816 | static void udp6_csum_zero_error(struct sk_buff *skb) |
817 | { | |
818 | /* RFC 2460 section 8.1 says that we SHOULD log | |
819 | * this error. Well, it is reasonable. | |
820 | */ | |
ba7a46f1 JP |
821 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
822 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
823 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
824 | } |
825 | ||
1da177e4 LT |
826 | /* |
827 | * Note: called only from the BH handler context, | |
828 | * so we don't need to lock the hashes. | |
829 | */ | |
e3163493 | 830 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 831 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 832 | struct udp_table *udptable, int proto) |
1da177e4 | 833 | { |
ca065d0c | 834 | struct sock *sk, *first = NULL; |
4bedb452 | 835 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
836 | unsigned short hnum = ntohs(uh->dest); |
837 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 838 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 839 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c | 840 | int dif = inet6_iif(skb); |
7bd2db40 | 841 | int sdif = inet6_sdif(skb); |
ca065d0c ED |
842 | struct hlist_node *node; |
843 | struct sk_buff *nskb; | |
2dc41cff DH |
844 | |
845 | if (use_hash2) { | |
f0b1e64c | 846 | hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & |
73e2d5e3 | 847 | udptable->mask; |
f0b1e64c | 848 | hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
2dc41cff | 849 | start_lookup: |
73e2d5e3 | 850 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
851 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
852 | } | |
1da177e4 | 853 | |
ca065d0c ED |
854 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
855 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
7bd2db40 DM |
856 | uh->source, saddr, dif, sdif, |
857 | hnum)) | |
ca065d0c ED |
858 | continue; |
859 | /* If zero checksum and no_check is not on for | |
860 | * the socket then skip it. | |
861 | */ | |
bcbc1b1d | 862 | if (!uh->check && !udp_get_no_check6_rx(sk)) |
ca065d0c ED |
863 | continue; |
864 | if (!first) { | |
865 | first = sk; | |
866 | continue; | |
867 | } | |
868 | nskb = skb_clone(skb, GFP_ATOMIC); | |
869 | if (unlikely(!nskb)) { | |
870 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
871 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
872 | IS_UDPLITE(sk)); | |
873 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
874 | IS_UDPLITE(sk)); | |
ca065d0c | 875 | continue; |
95766fff | 876 | } |
a1ab77f9 | 877 | |
ca065d0c ED |
878 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
879 | consume_skb(nskb); | |
880 | } | |
a1ab77f9 | 881 | |
2dc41cff DH |
882 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
883 | if (use_hash2 && hash2 != hash2_any) { | |
884 | hash2 = hash2_any; | |
885 | goto start_lookup; | |
886 | } | |
887 | ||
ca065d0c ED |
888 | if (first) { |
889 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
890 | consume_skb(skb); | |
a1ab77f9 | 891 | } else { |
ca065d0c | 892 | kfree_skb(skb); |
02c22347 ED |
893 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
894 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 895 | } |
ba4e58ec | 896 | return 0; |
1da177e4 LT |
897 | } |
898 | ||
64f0f5d1 PA |
899 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
900 | { | |
901 | if (udp_sk_rx_dst_set(sk, dst)) { | |
902 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
903 | ||
ef57c161 | 904 | sk->sk_rx_dst_cookie = rt6_get_cookie(rt); |
64f0f5d1 PA |
905 | } |
906 | } | |
907 | ||
eb63f296 PA |
908 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
909 | * return code conversion for ip layer consumption | |
910 | */ | |
911 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
912 | struct udphdr *uh) | |
913 | { | |
914 | int ret; | |
915 | ||
916 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
e4aa33ad | 917 | skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); |
eb63f296 PA |
918 | |
919 | ret = udpv6_queue_rcv_skb(sk, skb); | |
920 | ||
84dad559 | 921 | /* a return value > 0 means to resubmit the input */ |
eb63f296 | 922 | if (ret > 0) |
84dad559 | 923 | return ret; |
eb63f296 PA |
924 | return 0; |
925 | } | |
926 | ||
645ca708 | 927 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 928 | int proto) |
1da177e4 | 929 | { |
4cf91f82 | 930 | enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ca065d0c | 931 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 932 | struct net *net = dev_net(skb->dev); |
1ab1457c | 933 | struct udphdr *uh; |
ca065d0c | 934 | struct sock *sk; |
71489e21 | 935 | bool refcounted; |
1da177e4 LT |
936 | u32 ulen = 0; |
937 | ||
938 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 939 | goto discard; |
1da177e4 | 940 | |
0660e03f ACM |
941 | saddr = &ipv6_hdr(skb)->saddr; |
942 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 943 | uh = udp_hdr(skb); |
1da177e4 LT |
944 | |
945 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
946 | if (ulen > skb->len) |
947 | goto short_packet; | |
1da177e4 | 948 | |
759e5d00 HX |
949 | if (proto == IPPROTO_UDP) { |
950 | /* UDP validates ulen. */ | |
1da177e4 | 951 | |
ba4e58ec GR |
952 | /* Check for jumbo payload */ |
953 | if (ulen == 0) | |
954 | ulen = skb->len; | |
1da177e4 | 955 | |
ba4e58ec GR |
956 | if (ulen < sizeof(*uh)) |
957 | goto short_packet; | |
1da177e4 | 958 | |
ba4e58ec GR |
959 | if (ulen < skb->len) { |
960 | if (pskb_trim_rcsum(skb, ulen)) | |
961 | goto short_packet; | |
0660e03f ACM |
962 | saddr = &ipv6_hdr(skb)->saddr; |
963 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 964 | uh = udp_hdr(skb); |
ba4e58ec | 965 | } |
ba4e58ec | 966 | } |
1da177e4 | 967 | |
759e5d00 | 968 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 969 | goto csum_error; |
759e5d00 | 970 | |
c9f2c1ae | 971 | /* Check if the socket is already available, e.g. due to early demux */ |
9c02bec9 LB |
972 | sk = inet6_steal_sock(net, skb, sizeof(struct udphdr), saddr, uh->source, daddr, uh->dest, |
973 | &refcounted, udp6_ehashfn); | |
974 | if (IS_ERR(sk)) | |
975 | goto no_sk; | |
976 | ||
c9f2c1ae PA |
977 | if (sk) { |
978 | struct dst_entry *dst = skb_dst(skb); | |
979 | int ret; | |
980 | ||
8f905c0e | 981 | if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) |
64f0f5d1 | 982 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae | 983 | |
bcbc1b1d | 984 | if (!uh->check && !udp_get_no_check6_rx(sk)) { |
71489e21 JS |
985 | if (refcounted) |
986 | sock_put(sk); | |
eb63f296 PA |
987 | goto report_csum_error; |
988 | } | |
c9f2c1ae | 989 | |
eb63f296 | 990 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
71489e21 JS |
991 | if (refcounted) |
992 | sock_put(sk); | |
eb63f296 | 993 | return ret; |
c9f2c1ae PA |
994 | } |
995 | ||
1ab1457c YH |
996 | /* |
997 | * Multicast receive code | |
1da177e4 | 998 | */ |
ba4e58ec | 999 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 1000 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 1001 | saddr, daddr, udptable, proto); |
1da177e4 LT |
1002 | |
1003 | /* Unicast */ | |
607c4aaf | 1004 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 1005 | if (sk) { |
bcbc1b1d | 1006 | if (!uh->check && !udp_get_no_check6_rx(sk)) |
eb63f296 PA |
1007 | goto report_csum_error; |
1008 | return udp6_unicast_rcv_skb(sk, skb, uh); | |
1da177e4 | 1009 | } |
9c02bec9 | 1010 | no_sk: |
4cf91f82 DA |
1011 | reason = SKB_DROP_REASON_NO_SOCKET; |
1012 | ||
eb63f296 PA |
1013 | if (!uh->check) |
1014 | goto report_csum_error; | |
4068579e | 1015 | |
cb80ef46 | 1016 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 1017 | goto discard; |
b0e214d2 | 1018 | nf_reset_ct(skb); |
cb80ef46 BL |
1019 | |
1020 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 1021 | goto csum_error; |
cb80ef46 | 1022 | |
02c22347 | 1023 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
1024 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
1025 | ||
4cf91f82 | 1026 | kfree_skb_reason(skb, reason); |
add459aa | 1027 | return 0; |
1da177e4 | 1028 | |
1ab1457c | 1029 | short_packet: |
4cf91f82 DA |
1030 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1031 | reason = SKB_DROP_REASON_PKT_TOO_SMALL; | |
ba7a46f1 JP |
1032 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
1033 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
1034 | saddr, ntohs(uh->source), | |
1035 | ulen, skb->len, | |
1036 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 | 1037 | goto discard; |
eb63f296 PA |
1038 | |
1039 | report_csum_error: | |
1040 | udp6_csum_zero_error(skb); | |
6a5dc9e5 | 1041 | csum_error: |
4cf91f82 DA |
1042 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1043 | reason = SKB_DROP_REASON_UDP_CSUM; | |
02c22347 | 1044 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1045 | discard: |
02c22347 | 1046 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
4cf91f82 | 1047 | kfree_skb_reason(skb, reason); |
add459aa | 1048 | return 0; |
1da177e4 | 1049 | } |
ba4e58ec | 1050 | |
0bd84065 | 1051 | |
5425077d | 1052 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
1053 | __be16 loc_port, const struct in6_addr *loc_addr, | |
1054 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 1055 | int dif, int sdif) |
5425077d | 1056 | { |
ba6aac15 | 1057 | struct udp_table *udptable = net->ipv4.udp_table; |
0bd84065 | 1058 | unsigned short hnum = ntohs(loc_port); |
919dfa0b KI |
1059 | unsigned int hash2, slot2; |
1060 | struct udp_hslot *hslot2; | |
1061 | __portpair ports; | |
5425077d | 1062 | struct sock *sk; |
1063 | ||
919dfa0b | 1064 | hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
ba6aac15 KI |
1065 | slot2 = hash2 & udptable->mask; |
1066 | hslot2 = &udptable->hash2[slot2]; | |
919dfa0b KI |
1067 | ports = INET_COMBINED_PORTS(rmt_port, hnum); |
1068 | ||
0bd84065 | 1069 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 1070 | if (sk->sk_state == TCP_ESTABLISHED && |
5d368f03 | 1071 | inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 1072 | return sk; |
1073 | /* Only check first socket in chain */ | |
1074 | break; | |
1075 | } | |
1076 | return NULL; | |
5425077d | 1077 | } |
1078 | ||
11052589 | 1079 | void udp_v6_early_demux(struct sk_buff *skb) |
5425077d | 1080 | { |
1081 | struct net *net = dev_net(skb->dev); | |
1082 | const struct udphdr *uh; | |
1083 | struct sock *sk; | |
1084 | struct dst_entry *dst; | |
1085 | int dif = skb->dev->ifindex; | |
4297a0ef | 1086 | int sdif = inet6_sdif(skb); |
5425077d | 1087 | |
1088 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
1089 | sizeof(struct udphdr))) | |
1090 | return; | |
1091 | ||
1092 | uh = udp_hdr(skb); | |
1093 | ||
1094 | if (skb->pkt_type == PACKET_HOST) | |
1095 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
1096 | &ipv6_hdr(skb)->daddr, | |
1097 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 1098 | dif, sdif); |
5425077d | 1099 | else |
1100 | return; | |
1101 | ||
08842c43 | 1102 | if (!sk) |
5425077d | 1103 | return; |
1104 | ||
1105 | skb->sk = sk; | |
08842c43 ED |
1106 | DEBUG_NET_WARN_ON_ONCE(sk_is_refcounted(sk)); |
1107 | skb->destructor = sock_pfree; | |
8f905c0e | 1108 | dst = rcu_dereference(sk->sk_rx_dst); |
5425077d | 1109 | |
1110 | if (dst) | |
ef57c161 | 1111 | dst = dst_check(dst, sk->sk_rx_dst_cookie); |
5425077d | 1112 | if (dst) { |
d24406c8 WW |
1113 | /* set noref for now. |
1114 | * any place which wants to hold dst has to call | |
1115 | * dst_hold_safe() | |
1116 | */ | |
1117 | skb_dst_set_noref(skb, dst); | |
5425077d | 1118 | } |
1119 | } | |
1120 | ||
0e219ae4 | 1121 | INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 1122 | { |
ba6aac15 | 1123 | return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP); |
ba4e58ec GR |
1124 | } |
1125 | ||
1da177e4 LT |
1126 | /* |
1127 | * Throw away all pending data and cancel the corking. Socket is locked. | |
1128 | */ | |
1129 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
1130 | { | |
1131 | struct udp_sock *up = udp_sk(sk); | |
1132 | ||
36d926b9 DL |
1133 | if (up->pending == AF_INET) |
1134 | udp_flush_pending_frames(sk); | |
1135 | else if (up->pending) { | |
1da177e4 | 1136 | up->len = 0; |
482521d8 | 1137 | WRITE_ONCE(up->pending, 0); |
1da177e4 | 1138 | ip6_flush_pending_frames(sk); |
1ab1457c | 1139 | } |
1da177e4 LT |
1140 | } |
1141 | ||
d74bad4e AI |
1142 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
1143 | int addr_len) | |
1144 | { | |
bddc028a TH |
1145 | if (addr_len < offsetofend(struct sockaddr, sa_family)) |
1146 | return -EINVAL; | |
d74bad4e AI |
1147 | /* The following checks are replicated from __ip6_datagram_connect() |
1148 | * and intended to prevent BPF program called below from accessing | |
1149 | * bytes that are out of the bound specified by user in addr_len. | |
1150 | */ | |
1151 | if (uaddr->sa_family == AF_INET) { | |
89e9c728 | 1152 | if (ipv6_only_sock(sk)) |
d74bad4e AI |
1153 | return -EAFNOSUPPORT; |
1154 | return udp_pre_connect(sk, uaddr, addr_len); | |
1155 | } | |
1156 | ||
1157 | if (addr_len < SIN6_LEN_RFC2133) | |
1158 | return -EINVAL; | |
1159 | ||
fefba7d1 | 1160 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr, &addr_len); |
d74bad4e AI |
1161 | } |
1162 | ||
493c6be3 | 1163 | /** |
67ba4152 IM |
1164 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
1165 | * @sk: socket we are sending on | |
1166 | * @skb: sk_buff containing the filled-in UDP header | |
1167 | * (checksum field must be zeroed out) | |
b51cd7c8 AL |
1168 | * @saddr: source address |
1169 | * @daddr: destination address | |
1170 | * @len: length of packet | |
493c6be3 SS |
1171 | */ |
1172 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
1173 | const struct in6_addr *saddr, | |
1174 | const struct in6_addr *daddr, int len) | |
1175 | { | |
1176 | unsigned int offset; | |
1177 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1178 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1179 | __wsum csum = 0; |
1180 | ||
d39d938c | 1181 | if (!frags) { |
493c6be3 SS |
1182 | /* Only one fragment on the socket. */ |
1183 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1184 | skb->csum_offset = offsetof(struct udphdr, check); | |
1185 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1186 | } else { | |
1187 | /* | |
1188 | * HW-checksum won't work as there are two or more | |
1189 | * fragments on the socket so that all csums of sk_buffs | |
1190 | * should be together | |
1191 | */ | |
1192 | offset = skb_transport_offset(skb); | |
1193 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1194 | csum = skb->csum; |
493c6be3 SS |
1195 | |
1196 | skb->ip_summed = CHECKSUM_NONE; | |
1197 | ||
d39d938c VY |
1198 | do { |
1199 | csum = csum_add(csum, frags->csum); | |
1200 | } while ((frags = frags->next)); | |
493c6be3 SS |
1201 | |
1202 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1203 | csum); | |
1204 | if (uh->check == 0) | |
1205 | uh->check = CSUM_MANGLED_0; | |
1206 | } | |
1207 | } | |
1208 | ||
1da177e4 LT |
1209 | /* |
1210 | * Sending | |
1211 | */ | |
1212 | ||
bec1f6f6 WB |
1213 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1214 | struct inet_cork *cork) | |
1da177e4 | 1215 | { |
d39d938c | 1216 | struct sock *sk = skb->sk; |
1da177e4 | 1217 | struct udphdr *uh; |
1da177e4 | 1218 | int err = 0; |
b2bf1e26 | 1219 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1220 | __wsum csum = 0; |
d39d938c VY |
1221 | int offset = skb_transport_offset(skb); |
1222 | int len = skb->len - offset; | |
4094871d | 1223 | int datalen = len - sizeof(*uh); |
1da177e4 LT |
1224 | |
1225 | /* | |
1226 | * Create a UDP header | |
1227 | */ | |
4bedb452 | 1228 | uh = udp_hdr(skb); |
1958b856 DM |
1229 | uh->source = fl6->fl6_sport; |
1230 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1231 | uh->len = htons(len); |
1da177e4 LT |
1232 | uh->check = 0; |
1233 | ||
bec1f6f6 WB |
1234 | if (cork->gso_size) { |
1235 | const int hlen = skb_network_header_len(skb) + | |
1236 | sizeof(struct udphdr); | |
1237 | ||
0f149c9f WB |
1238 | if (hlen + cork->gso_size > cork->fragsize) { |
1239 | kfree_skb(skb); | |
bec1f6f6 | 1240 | return -EINVAL; |
0f149c9f | 1241 | } |
736ef37f | 1242 | if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { |
0f149c9f | 1243 | kfree_skb(skb); |
bec1f6f6 | 1244 | return -EINVAL; |
0f149c9f | 1245 | } |
a0002127 | 1246 | if (udp_get_no_check6_tx(sk)) { |
0f149c9f | 1247 | kfree_skb(skb); |
a8c744a8 | 1248 | return -EINVAL; |
0f149c9f | 1249 | } |
ff06342c | 1250 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || |
0f149c9f WB |
1251 | dst_xfrm(skb_dst(skb))) { |
1252 | kfree_skb(skb); | |
bec1f6f6 | 1253 | return -EIO; |
0f149c9f | 1254 | } |
bec1f6f6 | 1255 | |
4094871d JH |
1256 | if (datalen > cork->gso_size) { |
1257 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1258 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
1259 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, | |
1260 | cork->gso_size); | |
1261 | } | |
a8c744a8 | 1262 | goto csum_partial; |
bec1f6f6 WB |
1263 | } |
1264 | ||
b2bf1e26 | 1265 | if (is_udplite) |
d39d938c | 1266 | csum = udplite_csum(skb); |
a0002127 | 1267 | else if (udp_get_no_check6_tx(sk)) { /* UDP csum disabled */ |
4068579e TH |
1268 | skb->ip_summed = CHECKSUM_NONE; |
1269 | goto send; | |
1270 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
a8c744a8 | 1271 | csum_partial: |
d39d938c | 1272 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1273 | goto send; |
1274 | } else | |
d39d938c | 1275 | csum = udp_csum(skb); |
1da177e4 | 1276 | |
ba4e58ec | 1277 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1278 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1279 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1280 | if (uh->check == 0) |
f6ab0288 | 1281 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1282 | |
493c6be3 | 1283 | send: |
d39d938c | 1284 | err = ip6_send_skb(skb); |
6ce9e7b5 | 1285 | if (err) { |
3fa29971 | 1286 | if (err == -ENOBUFS && !inet6_test_bit(RECVERR6, sk)) { |
6aef70a8 ED |
1287 | UDP6_INC_STATS(sock_net(sk), |
1288 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1289 | err = 0; |
1290 | } | |
6aef70a8 ED |
1291 | } else { |
1292 | UDP6_INC_STATS(sock_net(sk), | |
1293 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1294 | } | |
d39d938c VY |
1295 | return err; |
1296 | } | |
1297 | ||
1298 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1299 | { | |
1300 | struct sk_buff *skb; | |
1301 | struct udp_sock *up = udp_sk(sk); | |
d39d938c VY |
1302 | int err = 0; |
1303 | ||
1304 | if (up->pending == AF_INET) | |
1305 | return udp_push_pending_frames(sk); | |
1306 | ||
d39d938c VY |
1307 | skb = ip6_finish_skb(sk); |
1308 | if (!skb) | |
1309 | goto out; | |
1310 | ||
940ea00b PB |
1311 | err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, |
1312 | &inet_sk(sk)->cork.base); | |
1da177e4 LT |
1313 | out: |
1314 | up->len = 0; | |
482521d8 | 1315 | WRITE_ONCE(up->pending, 0); |
1da177e4 LT |
1316 | return err; |
1317 | } | |
1318 | ||
1b784140 | 1319 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1320 | { |
1321 | struct ipv6_txoptions opt_space; | |
1322 | struct udp_sock *up = udp_sk(sk); | |
1323 | struct inet_sock *inet = inet_sk(sk); | |
1324 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1325 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1326 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1327 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1328 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1329 | struct ip6_flowlabel *flowlabel = NULL; |
5298953e PB |
1330 | struct inet_cork_full cork; |
1331 | struct flowi6 *fl6 = &cork.fl.u.ip6; | |
1da177e4 | 1332 | struct dst_entry *dst; |
26879da5 | 1333 | struct ipcm6_cookie ipc6; |
1da177e4 | 1334 | int addr_len = msg->msg_namelen; |
9f542f61 | 1335 | bool connected = false; |
1da177e4 | 1336 | int ulen = len; |
81b36803 | 1337 | int corkreq = udp_test_bit(CORK, sk) || msg->msg_flags & MSG_MORE; |
1da177e4 | 1338 | int err; |
b2bf1e26 | 1339 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1340 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 | 1341 | |
b515430a | 1342 | ipcm6_init(&ipc6); |
18a419ba | 1343 | ipc6.gso_size = READ_ONCE(up->gso_size); |
e3390b30 | 1344 | ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags); |
3c5b4d69 | 1345 | ipc6.sockc.mark = READ_ONCE(sk->sk_mark); |
26879da5 | 1346 | |
1da177e4 LT |
1347 | /* destination address check */ |
1348 | if (sin6) { | |
1349 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1350 | return -EINVAL; | |
1351 | ||
1352 | switch (sin6->sin6_family) { | |
1353 | case AF_INET6: | |
1354 | if (addr_len < SIN6_LEN_RFC2133) | |
1355 | return -EINVAL; | |
1356 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1357 | if (ipv6_addr_any(daddr) && |
1358 | ipv6_addr_v4mapped(&np->saddr)) | |
1359 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1360 | daddr); | |
1da177e4 LT |
1361 | break; |
1362 | case AF_INET: | |
1363 | goto do_udp_sendmsg; | |
1364 | case AF_UNSPEC: | |
1365 | msg->msg_name = sin6 = NULL; | |
1366 | msg->msg_namelen = addr_len = 0; | |
1367 | daddr = NULL; | |
1368 | break; | |
1369 | default: | |
1370 | return -EINVAL; | |
1371 | } | |
482521d8 | 1372 | } else if (!READ_ONCE(up->pending)) { |
1da177e4 LT |
1373 | if (sk->sk_state != TCP_ESTABLISHED) |
1374 | return -EDESTADDRREQ; | |
efe4208f | 1375 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1376 | } else |
1da177e4 LT |
1377 | daddr = NULL; |
1378 | ||
1379 | if (daddr) { | |
e773e4fa | 1380 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1381 | struct sockaddr_in sin; |
1382 | sin.sin_family = AF_INET; | |
c720c7e8 | 1383 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1384 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1385 | msg->msg_name = &sin; | |
1386 | msg->msg_namelen = sizeof(sin); | |
1387 | do_udp_sendmsg: | |
1c5950fc ED |
1388 | err = ipv6_only_sock(sk) ? |
1389 | -ENETUNREACH : udp_sendmsg(sk, msg, len); | |
1390 | msg->msg_name = sin6; | |
1391 | msg->msg_namelen = addr_len; | |
1392 | return err; | |
1da177e4 LT |
1393 | } |
1394 | } | |
1395 | ||
1da177e4 | 1396 | /* Rough check on arithmetic overflow, |
b59e139b | 1397 | better check is made in ip6_append_data(). |
1da177e4 LT |
1398 | */ |
1399 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1400 | return -EMSGSIZE; | |
1ab1457c | 1401 | |
03485f2a | 1402 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
482521d8 ED |
1403 | if (READ_ONCE(up->pending)) { |
1404 | if (READ_ONCE(up->pending) == AF_INET) | |
406c4a0a | 1405 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1406 | /* |
1407 | * There are pending frames. | |
1408 | * The socket lock must be held while it's corked. | |
1409 | */ | |
1410 | lock_sock(sk); | |
1411 | if (likely(up->pending)) { | |
1412 | if (unlikely(up->pending != AF_INET6)) { | |
1413 | release_sock(sk); | |
1414 | return -EAFNOSUPPORT; | |
1415 | } | |
1416 | dst = NULL; | |
1417 | goto do_append_data; | |
1418 | } | |
1419 | release_sock(sk); | |
1420 | } | |
1421 | ulen += sizeof(struct udphdr); | |
1422 | ||
5298953e | 1423 | memset(fl6, 0, sizeof(*fl6)); |
1da177e4 LT |
1424 | |
1425 | if (sin6) { | |
1426 | if (sin6->sin6_port == 0) | |
1427 | return -EINVAL; | |
1428 | ||
5298953e | 1429 | fl6->fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1430 | daddr = &sin6->sin6_addr; |
1431 | ||
859f8b26 | 1432 | if (inet6_test_bit(SNDFLOW, sk)) { |
5298953e PB |
1433 | fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1434 | if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { | |
1435 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1436 | if (IS_ERR(flowlabel)) |
1da177e4 | 1437 | return -EINVAL; |
1da177e4 LT |
1438 | } |
1439 | } | |
1440 | ||
1441 | /* | |
1442 | * Otherwise it will be difficult to maintain | |
1443 | * sk->sk_dst_cache. | |
1444 | */ | |
1445 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1446 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1447 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1448 | |
1449 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1450 | sin6->sin6_scope_id && | |
842df073 | 1451 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
5298953e | 1452 | fl6->flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1453 | } else { |
1454 | if (sk->sk_state != TCP_ESTABLISHED) | |
1455 | return -EDESTADDRREQ; | |
1456 | ||
5298953e | 1457 | fl6->fl6_dport = inet->inet_dport; |
efe4208f | 1458 | daddr = &sk->sk_v6_daddr; |
5298953e | 1459 | fl6->flowlabel = np->flow_label; |
9f542f61 | 1460 | connected = true; |
1da177e4 LT |
1461 | } |
1462 | ||
5298953e | 1463 | if (!fl6->flowi6_oif) |
4c971d2f | 1464 | fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); |
1da177e4 | 1465 | |
5298953e PB |
1466 | if (!fl6->flowi6_oif) |
1467 | fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1468 | |
5298953e | 1469 | fl6->flowi6_uid = sk->sk_uid; |
51953d5b | 1470 | |
1da177e4 LT |
1471 | if (msg->msg_controllen) { |
1472 | opt = &opt_space; | |
1473 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1474 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1475 | ipc6.opt = opt; |
1da177e4 | 1476 | |
2e8de857 | 1477 | err = udp_cmsg_send(sk, msg, &ipc6.gso_size); |
680d11f6 | 1478 | if (err > 0) { |
5298953e | 1479 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, |
5fdaa88d | 1480 | &ipc6); |
680d11f6 YX |
1481 | connected = false; |
1482 | } | |
1da177e4 LT |
1483 | if (err < 0) { |
1484 | fl6_sock_release(flowlabel); | |
1485 | return err; | |
1486 | } | |
5298953e PB |
1487 | if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1488 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1489 | if (IS_ERR(flowlabel)) |
1da177e4 LT |
1490 | return -EINVAL; |
1491 | } | |
1492 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1493 | opt = NULL; | |
1494 | } | |
45f6fad8 ED |
1495 | if (!opt) { |
1496 | opt = txopt_get(np); | |
1497 | opt_to_free = opt; | |
1498 | } | |
df9890c3 YH |
1499 | if (flowlabel) |
1500 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1501 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1502 | ipc6.opt = opt; |
1da177e4 | 1503 | |
5298953e PB |
1504 | fl6->flowi6_proto = sk->sk_protocol; |
1505 | fl6->flowi6_mark = ipc6.sockc.mark; | |
1506 | fl6->daddr = *daddr; | |
1507 | if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) | |
1508 | fl6->saddr = np->saddr; | |
1509 | fl6->fl6_sport = inet->inet_sport; | |
1ab1457c | 1510 | |
6fc88c35 | 1511 | if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { |
1cedee13 | 1512 | err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, |
5298953e | 1513 | (struct sockaddr *)sin6, |
fefba7d1 | 1514 | &addr_len, |
5298953e | 1515 | &fl6->saddr); |
1cedee13 AI |
1516 | if (err) |
1517 | goto out_no_dst; | |
1518 | if (sin6) { | |
1519 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { | |
1520 | /* BPF program rewrote IPv6-only by IPv4-mapped | |
1521 | * IPv6. It's currently unsupported. | |
1522 | */ | |
1523 | err = -ENOTSUPP; | |
1524 | goto out_no_dst; | |
1525 | } | |
1526 | if (sin6->sin6_port == 0) { | |
1527 | /* BPF program set invalid port. Reject it. */ | |
1528 | err = -EINVAL; | |
1529 | goto out_no_dst; | |
1530 | } | |
5298953e PB |
1531 | fl6->fl6_dport = sin6->sin6_port; |
1532 | fl6->daddr = sin6->sin6_addr; | |
1cedee13 AI |
1533 | } |
1534 | } | |
1535 | ||
5298953e PB |
1536 | if (ipv6_addr_any(&fl6->daddr)) |
1537 | fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
e8e36984 | 1538 | |
5298953e | 1539 | final_p = fl6_update_dst(fl6, opt, &final); |
20c59de2 | 1540 | if (final_p) |
9f542f61 | 1541 | connected = false; |
1da177e4 | 1542 | |
5298953e | 1543 | if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { |
d2f011a0 | 1544 | fl6->flowi6_oif = READ_ONCE(np->mcast_oif); |
9f542f61 | 1545 | connected = false; |
5298953e | 1546 | } else if (!fl6->flowi6_oif) |
1ac13efd | 1547 | fl6->flowi6_oif = READ_ONCE(np->ucast_oif); |
1da177e4 | 1548 | |
5298953e | 1549 | security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); |
beb8d13b | 1550 | |
38b7097b HFS |
1551 | if (ipc6.tclass < 0) |
1552 | ipc6.tclass = np->tclass; | |
1553 | ||
5298953e | 1554 | fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); |
38b7097b | 1555 | |
5298953e | 1556 | dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); |
68d0c6d3 DM |
1557 | if (IS_ERR(dst)) { |
1558 | err = PTR_ERR(dst); | |
1559 | dst = NULL; | |
1da177e4 | 1560 | goto out; |
14e50e57 | 1561 | } |
1da177e4 | 1562 | |
26879da5 | 1563 | if (ipc6.hlimit < 0) |
5298953e | 1564 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); |
1da177e4 LT |
1565 | |
1566 | if (msg->msg_flags&MSG_CONFIRM) | |
1567 | goto do_confirm; | |
1568 | back_from_confirm: | |
1569 | ||
03485f2a VY |
1570 | /* Lockless fast path for the non-corking case */ |
1571 | if (!corkreq) { | |
1572 | struct sk_buff *skb; | |
1573 | ||
1574 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1575 | sizeof(struct udphdr), &ipc6, |
f37a4cc6 | 1576 | (struct rt6_info *)dst, |
5fdaa88d | 1577 | msg->msg_flags, &cork); |
03485f2a VY |
1578 | err = PTR_ERR(skb); |
1579 | if (!IS_ERR_OR_NULL(skb)) | |
5298953e | 1580 | err = udp_v6_send_skb(skb, fl6, &cork.base); |
40ac240c PB |
1581 | /* ip6_make_skb steals dst reference */ |
1582 | goto out_no_dst; | |
03485f2a VY |
1583 | } |
1584 | ||
1da177e4 LT |
1585 | lock_sock(sk); |
1586 | if (unlikely(up->pending)) { | |
1587 | /* The socket is already corked while preparing it. */ | |
1588 | /* ... which is an evident application bug. --ANK */ | |
1589 | release_sock(sk); | |
1590 | ||
ba7a46f1 | 1591 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1592 | err = -EINVAL; |
1593 | goto out; | |
1594 | } | |
1595 | ||
482521d8 | 1596 | WRITE_ONCE(up->pending, AF_INET6); |
1da177e4 LT |
1597 | |
1598 | do_append_data: | |
26879da5 | 1599 | if (ipc6.dontfrag < 0) |
1086ca7c | 1600 | ipc6.dontfrag = inet6_test_bit(DONTFRAG, sk); |
1da177e4 | 1601 | up->len += ulen; |
26879da5 | 1602 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
5298953e | 1603 | &ipc6, fl6, (struct rt6_info *)dst, |
5fdaa88d | 1604 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
1da177e4 LT |
1605 | if (err) |
1606 | udp_v6_flush_pending_frames(sk); | |
1607 | else if (!corkreq) | |
4c0a6cb0 | 1608 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 | 1609 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
482521d8 | 1610 | WRITE_ONCE(up->pending, 0); |
1da177e4 | 1611 | |
03485f2a | 1612 | if (err > 0) |
3fa29971 | 1613 | err = inet6_test_bit(RECVERR6, sk) ? net_xmit_errno(err) : 0; |
03485f2a VY |
1614 | release_sock(sk); |
1615 | ||
1da177e4 | 1616 | out: |
a3c96089 | 1617 | dst_release(dst); |
1cedee13 | 1618 | out_no_dst: |
1da177e4 | 1619 | fl6_sock_release(flowlabel); |
45f6fad8 | 1620 | txopt_put(opt_to_free); |
cd562c98 | 1621 | if (!err) |
1da177e4 | 1622 | return len; |
a18135eb DM |
1623 | /* |
1624 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1625 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1626 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1627 | * things). We could add another new stat but at least for now that | |
1628 | * seems like overkill. | |
1629 | */ | |
1630 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1631 | UDP6_INC_STATS(sock_net(sk), |
1632 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1633 | } |
1da177e4 LT |
1634 | return err; |
1635 | ||
1636 | do_confirm: | |
0dec879f | 1637 | if (msg->msg_flags & MSG_PROBE) |
5298953e | 1638 | dst_confirm_neigh(dst, &fl6->daddr); |
1da177e4 LT |
1639 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1640 | goto back_from_confirm; | |
1641 | err = 0; | |
1642 | goto out; | |
1643 | } | |
ed472b0c | 1644 | EXPORT_SYMBOL(udpv6_sendmsg); |
1da177e4 | 1645 | |
1d7e4538 DH |
1646 | static void udpv6_splice_eof(struct socket *sock) |
1647 | { | |
1648 | struct sock *sk = sock->sk; | |
1649 | struct udp_sock *up = udp_sk(sk); | |
1650 | ||
482521d8 | 1651 | if (!READ_ONCE(up->pending) || udp_test_bit(CORK, sk)) |
1d7e4538 DH |
1652 | return; |
1653 | ||
1654 | lock_sock(sk); | |
81b36803 | 1655 | if (up->pending && !udp_test_bit(CORK, sk)) |
1d7e4538 DH |
1656 | udp_v6_push_pending_frames(sk); |
1657 | release_sock(sk); | |
1658 | } | |
1659 | ||
7d06b2e0 | 1660 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1661 | { |
44046a59 | 1662 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 1663 | lock_sock(sk); |
a8b897c7 PA |
1664 | |
1665 | /* protects from races with udp_abort() */ | |
1666 | sock_set_flag(sk, SOCK_DEAD); | |
1da177e4 LT |
1667 | udp_v6_flush_pending_frames(sk); |
1668 | release_sock(sk); | |
1669 | ||
60fb9567 PA |
1670 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { |
1671 | if (up->encap_type) { | |
1672 | void (*encap_destroy)(struct sock *sk); | |
1673 | encap_destroy = READ_ONCE(up->encap_destroy); | |
1674 | if (encap_destroy) | |
1675 | encap_destroy(sk); | |
1676 | } | |
ac9a7f4c | 1677 | if (udp_test_bit(ENCAP_ENABLED, sk)) { |
9c480601 | 1678 | static_branch_dec(&udpv6_encap_needed_key); |
a4a600dd XL |
1679 | udp_encap_disable(); |
1680 | } | |
44046a59 | 1681 | } |
1da177e4 LT |
1682 | } |
1683 | ||
1684 | /* | |
1685 | * Socket option code for UDP | |
1686 | */ | |
a7b75c5a CH |
1687 | int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
1688 | unsigned int optlen) | |
3fdadf7d | 1689 | { |
8a3854c7 | 1690 | if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) |
91ac1cca | 1691 | return udp_lib_setsockopt(sk, level, optname, |
a7b75c5a | 1692 | optval, optlen, |
4c0a6cb0 | 1693 | udp_v6_push_pending_frames); |
ba4e58ec | 1694 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1695 | } |
1696 | ||
ba4e58ec GR |
1697 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1698 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1699 | { |
db8dac20 | 1700 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1701 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1702 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1703 | } |
1704 | ||
1da177e4 LT |
1705 | |
1706 | /* ------------------------------------------------------------------------ */ | |
1707 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1708 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1709 | { |
17ef66af LC |
1710 | if (v == SEQ_START_TOKEN) { |
1711 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1712 | } else { | |
1713 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
abc17a11 | 1714 | const struct inet_sock *inet = inet_sk((const struct sock *)v); |
17ef66af LC |
1715 | __u16 srcp = ntohs(inet->inet_sport); |
1716 | __u16 destp = ntohs(inet->inet_dport); | |
6c206b20 PA |
1717 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
1718 | udp_rqueue_get(v), bucket); | |
17ef66af | 1719 | } |
1da177e4 LT |
1720 | return 0; |
1721 | } | |
1722 | ||
c3506372 | 1723 | const struct seq_operations udp6_seq_ops = { |
a3d2599b CH |
1724 | .start = udp_seq_start, |
1725 | .next = udp_seq_next, | |
1726 | .stop = udp_seq_stop, | |
1727 | .show = udp6_seq_show, | |
1728 | }; | |
c3506372 | 1729 | EXPORT_SYMBOL(udp6_seq_ops); |
73cb88ec | 1730 | |
1da177e4 | 1731 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 | 1732 | .family = AF_INET6, |
478aee5d | 1733 | .udp_table = NULL, |
1da177e4 LT |
1734 | }; |
1735 | ||
2c8c1e72 | 1736 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1737 | { |
c3506372 CH |
1738 | if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, |
1739 | sizeof(struct udp_iter_state), &udp6_seq_afinfo)) | |
a3d2599b CH |
1740 | return -ENOMEM; |
1741 | return 0; | |
1da177e4 LT |
1742 | } |
1743 | ||
ec120da6 IM |
1744 | void udp6_proc_exit(struct net *net) |
1745 | { | |
a3d2599b | 1746 | remove_proc_entry("udp6", net->proc_net); |
1da177e4 LT |
1747 | } |
1748 | #endif /* CONFIG_PROC_FS */ | |
1749 | ||
1750 | /* ------------------------------------------------------------------------ */ | |
1751 | ||
1752 | struct proto udpv6_prot = { | |
1e802951 TZ |
1753 | .name = "UDPv6", |
1754 | .owner = THIS_MODULE, | |
1755 | .close = udp_lib_close, | |
d74bad4e | 1756 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1757 | .connect = ip6_datagram_connect, |
1758 | .disconnect = udp_disconnect, | |
1759 | .ioctl = udp_ioctl, | |
d38afeec | 1760 | .init = udpv6_init_sock, |
1e802951 TZ |
1761 | .destroy = udpv6_destroy_sock, |
1762 | .setsockopt = udpv6_setsockopt, | |
1763 | .getsockopt = udpv6_getsockopt, | |
1764 | .sendmsg = udpv6_sendmsg, | |
1765 | .recvmsg = udpv6_recvmsg, | |
1d7e4538 | 1766 | .splice_eof = udpv6_splice_eof, |
1e802951 TZ |
1767 | .release_cb = ip6_datagram_release_cb, |
1768 | .hash = udp_lib_hash, | |
1769 | .unhash = udp_lib_unhash, | |
1770 | .rehash = udp_v6_rehash, | |
1771 | .get_port = udp_v6_get_port, | |
91a760b2 | 1772 | .put_port = udp_lib_unhash, |
8a59f9d1 CW |
1773 | #ifdef CONFIG_BPF_SYSCALL |
1774 | .psock_update_sk_prot = udp_bpf_update_proto, | |
1775 | #endif | |
0defbb0a | 1776 | |
1e802951 | 1777 | .memory_allocated = &udp_memory_allocated, |
0defbb0a ED |
1778 | .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, |
1779 | ||
1e802951 TZ |
1780 | .sysctl_mem = sysctl_udp_mem, |
1781 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), | |
1782 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), | |
1783 | .obj_size = sizeof(struct udp6_sock), | |
f5f80e32 | 1784 | .ipv6_pinfo_offset = offsetof(struct udp6_sock, inet6), |
67fb4330 | 1785 | .h.udp_table = NULL, |
1e802951 | 1786 | .diag_destroy = udp_abort, |
1da177e4 LT |
1787 | }; |
1788 | ||
1da177e4 LT |
1789 | static struct inet_protosw udpv6_protosw = { |
1790 | .type = SOCK_DGRAM, | |
1791 | .protocol = IPPROTO_UDP, | |
1792 | .prot = &udpv6_prot, | |
1793 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1794 | .flags = INET_PROTOSW_PERMANENT, |
1795 | }; | |
1796 | ||
7f4e4868 | 1797 | int __init udpv6_init(void) |
1da177e4 | 1798 | { |
7f4e4868 DL |
1799 | int ret; |
1800 | ||
4ea0875b ED |
1801 | net_hotdata.udpv6_protocol = (struct inet6_protocol) { |
1802 | .handler = udpv6_rcv, | |
1803 | .err_handler = udpv6_err, | |
1804 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
1805 | }; | |
1806 | ret = inet6_add_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); | |
3336288a | 1807 | if (ret) |
c6b641a4 | 1808 | goto out; |
3336288a | 1809 | |
7f4e4868 DL |
1810 | ret = inet6_register_protosw(&udpv6_protosw); |
1811 | if (ret) | |
1812 | goto out_udpv6_protocol; | |
1813 | out: | |
1814 | return ret; | |
1815 | ||
1816 | out_udpv6_protocol: | |
4ea0875b | 1817 | inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); |
7f4e4868 DL |
1818 | goto out; |
1819 | } | |
1820 | ||
09f7709f | 1821 | void udpv6_exit(void) |
7f4e4868 DL |
1822 | { |
1823 | inet6_unregister_protosw(&udpv6_protosw); | |
4ea0875b | 1824 | inet6_del_protocol(&net_hotdata.udpv6_protocol, IPPROTO_UDP); |
1da177e4 | 1825 | } |