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> |
1da177e4 | 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 | |
d38afeec KI |
59 | static void udpv6_destruct_sock(struct sock *sk) |
60 | { | |
61 | udp_destruct_common(sk); | |
62 | inet6_sock_destruct(sk); | |
63 | } | |
64 | ||
65 | int udpv6_init_sock(struct sock *sk) | |
66 | { | |
67 | skb_queue_head_init(&udp_sk(sk)->reader_queue); | |
68 | sk->sk_destruct = udpv6_destruct_sock; | |
69 | return 0; | |
70 | } | |
71 | ||
6eada011 ED |
72 | static u32 udp6_ehashfn(const struct net *net, |
73 | const struct in6_addr *laddr, | |
74 | const u16 lport, | |
75 | const struct in6_addr *faddr, | |
76 | const __be16 fport) | |
b50026b5 | 77 | { |
1bbdceef HFS |
78 | static u32 udp6_ehash_secret __read_mostly; |
79 | static u32 udp_ipv6_hash_secret __read_mostly; | |
80 | ||
81 | u32 lhash, fhash; | |
82 | ||
83 | net_get_random_once(&udp6_ehash_secret, | |
84 | sizeof(udp6_ehash_secret)); | |
85 | net_get_random_once(&udp_ipv6_hash_secret, | |
86 | sizeof(udp_ipv6_hash_secret)); | |
87 | ||
88 | lhash = (__force u32)laddr->s6_addr32[3]; | |
89 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
90 | ||
b50026b5 | 91 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 92 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
93 | } |
94 | ||
6ba5a3c5 | 95 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 96 | { |
30fff923 | 97 | unsigned int hash2_nulladdr = |
f0b1e64c | 98 | ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
9a52e97e | 99 | unsigned int hash2_partial = |
f0b1e64c | 100 | ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 101 | |
d4cada4a | 102 | /* precompute partial secondary hash */ |
30fff923 | 103 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 104 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
1da177e4 LT |
105 | } |
106 | ||
f7c46156 | 107 | void udp_v6_rehash(struct sock *sk) |
719f8358 | 108 | { |
f0b1e64c | 109 | u16 new_hash = ipv6_portaddr_hash(sock_net(sk), |
efe4208f | 110 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
111 | inet_sk(sk)->inet_num); |
112 | ||
113 | udp_lib_rehash(sk, new_hash); | |
114 | } | |
115 | ||
d1e37288 SX |
116 | static int compute_score(struct sock *sk, struct net *net, |
117 | const struct in6_addr *saddr, __be16 sport, | |
118 | const struct in6_addr *daddr, unsigned short hnum, | |
73545373 | 119 | int dif, int sdif) |
645ca708 | 120 | { |
4c971d2f | 121 | int bound_dev_if, score; |
60c04aec | 122 | struct inet_sock *inet; |
6da5b0f0 | 123 | bool dev_match; |
60c04aec JP |
124 | |
125 | if (!net_eq(sock_net(sk), net) || | |
126 | udp_sk(sk)->udp_port_hash != hnum || | |
127 | sk->sk_family != PF_INET6) | |
128 | return -1; | |
129 | ||
23b0269e PO |
130 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) |
131 | return -1; | |
132 | ||
60c04aec JP |
133 | score = 0; |
134 | inet = inet_sk(sk); | |
135 | ||
136 | if (inet->inet_dport) { | |
137 | if (inet->inet_dport != sport) | |
138 | return -1; | |
139 | score++; | |
140 | } | |
141 | ||
60c04aec JP |
142 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
143 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
144 | return -1; | |
145 | score++; | |
146 | } | |
147 | ||
4c971d2f ED |
148 | bound_dev_if = READ_ONCE(sk->sk_bound_dev_if); |
149 | dev_match = udp_sk_bound_dev_eq(net, bound_dev_if, dif, sdif); | |
6da5b0f0 MM |
150 | if (!dev_match) |
151 | return -1; | |
4c971d2f | 152 | if (bound_dev_if) |
8d6c414c | 153 | score++; |
60c04aec | 154 | |
7170a977 | 155 | if (READ_ONCE(sk->sk_incoming_cpu) == raw_smp_processor_id()) |
70da268b ED |
156 | score++; |
157 | ||
645ca708 ED |
158 | return score; |
159 | } | |
160 | ||
a57066b1 DM |
161 | static struct sock *lookup_reuseport(struct net *net, struct sock *sk, |
162 | struct sk_buff *skb, | |
163 | const struct in6_addr *saddr, | |
164 | __be16 sport, | |
165 | const struct in6_addr *daddr, | |
166 | unsigned int hnum) | |
2a08748c JS |
167 | { |
168 | struct sock *reuse_sk = NULL; | |
169 | u32 hash; | |
170 | ||
171 | if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { | |
172 | hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); | |
173 | reuse_sk = reuseport_select_sock(sk, hash, skb, | |
174 | sizeof(struct udphdr)); | |
2a08748c JS |
175 | } |
176 | return reuse_sk; | |
177 | } | |
178 | ||
d1e37288 | 179 | /* called with rcu_read_lock() */ |
fddc17de ED |
180 | static struct sock *udp6_lib_lookup2(struct net *net, |
181 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 | 182 | const struct in6_addr *daddr, unsigned int hnum, |
73545373 TB |
183 | int dif, int sdif, struct udp_hslot *hslot2, |
184 | struct sk_buff *skb) | |
fddc17de ED |
185 | { |
186 | struct sock *sk, *result; | |
e94a62f5 | 187 | int score, badness; |
fddc17de | 188 | |
fddc17de ED |
189 | result = NULL; |
190 | badness = -1; | |
ca065d0c | 191 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 192 | score = compute_score(sk, net, saddr, sport, |
73545373 | 193 | daddr, hnum, dif, sdif); |
fddc17de | 194 | if (score > badness) { |
2a08748c JS |
195 | result = lookup_reuseport(net, sk, skb, |
196 | saddr, sport, daddr, hnum); | |
a57066b1 | 197 | /* Fall back to scoring if group has connections */ |
69421bf9 | 198 | if (result && !reuseport_has_conns(sk)) |
2a08748c JS |
199 | return result; |
200 | ||
a57066b1 | 201 | result = result ? : sk; |
ca065d0c | 202 | badness = score; |
fddc17de ED |
203 | } |
204 | } | |
fddc17de ED |
205 | return result; |
206 | } | |
207 | ||
6d4201b1 JS |
208 | static inline struct sock *udp6_lookup_run_bpf(struct net *net, |
209 | struct udp_table *udptable, | |
210 | struct sk_buff *skb, | |
211 | const struct in6_addr *saddr, | |
212 | __be16 sport, | |
213 | const struct in6_addr *daddr, | |
f8931565 | 214 | u16 hnum, const int dif) |
6d4201b1 JS |
215 | { |
216 | struct sock *sk, *reuse_sk; | |
217 | bool no_reuseport; | |
218 | ||
219 | if (udptable != &udp_table) | |
220 | return NULL; /* only UDP is supported */ | |
221 | ||
f8931565 MP |
222 | no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport, |
223 | daddr, hnum, dif, &sk); | |
6d4201b1 JS |
224 | if (no_reuseport || IS_ERR_OR_NULL(sk)) |
225 | return sk; | |
226 | ||
227 | reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); | |
c64c9c28 | 228 | if (reuse_sk) |
6d4201b1 JS |
229 | sk = reuse_sk; |
230 | return sk; | |
231 | } | |
232 | ||
ca065d0c | 233 | /* rcu_read_lock() must be held */ |
fce82338 | 234 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
235 | const struct in6_addr *saddr, __be16 sport, |
236 | const struct in6_addr *daddr, __be16 dport, | |
237 | int dif, int sdif, struct udp_table *udptable, | |
238 | struct sk_buff *skb) | |
1da177e4 | 239 | { |
1da177e4 | 240 | unsigned short hnum = ntohs(dport); |
23b0269e PO |
241 | unsigned int hash2, slot2; |
242 | struct udp_hslot *hslot2; | |
6d4201b1 | 243 | struct sock *result, *sk; |
645ca708 | 244 | |
23b0269e PO |
245 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
246 | slot2 = hash2 & udptable->mask; | |
247 | hslot2 = &udptable->hash2[slot2]; | |
248 | ||
6d4201b1 | 249 | /* Lookup connected or non-wildcard sockets */ |
23b0269e | 250 | result = udp6_lib_lookup2(net, saddr, sport, |
73545373 | 251 | daddr, hnum, dif, sdif, |
23b0269e | 252 | hslot2, skb); |
6d4201b1 JS |
253 | if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) |
254 | goto done; | |
255 | ||
256 | /* Lookup redirect from BPF */ | |
257 | if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { | |
258 | sk = udp6_lookup_run_bpf(net, udptable, skb, | |
f8931565 | 259 | saddr, sport, daddr, hnum, dif); |
6d4201b1 JS |
260 | if (sk) { |
261 | result = sk; | |
262 | goto done; | |
263 | } | |
264 | } | |
23b0269e | 265 | |
6d4201b1 JS |
266 | /* Got non-wildcard socket or error on first lookup */ |
267 | if (result) | |
268 | goto done; | |
fddc17de | 269 | |
6d4201b1 JS |
270 | /* Lookup wildcard sockets */ |
271 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); | |
272 | slot2 = hash2 & udptable->mask; | |
273 | hslot2 = &udptable->hash2[slot2]; | |
274 | ||
275 | result = udp6_lib_lookup2(net, saddr, sport, | |
276 | &in6addr_any, hnum, dif, sdif, | |
277 | hslot2, skb); | |
278 | done: | |
26f8113c | 279 | if (IS_ERR(result)) |
23b0269e | 280 | return NULL; |
1da177e4 LT |
281 | return result; |
282 | } | |
fce82338 | 283 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 284 | |
607c4aaf KK |
285 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
286 | __be16 sport, __be16 dport, | |
645ca708 | 287 | struct udp_table *udptable) |
607c4aaf | 288 | { |
b71d1d42 | 289 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 290 | |
ed7cbbce | 291 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 292 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 293 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
294 | } |
295 | ||
7b58e63e | 296 | struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, |
63058308 TH |
297 | __be16 sport, __be16 dport) |
298 | { | |
299 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
63058308 | 300 | |
ed7cbbce | 301 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
63058308 | 302 | &iph->daddr, dport, inet6_iif(skb), |
257a525f | 303 | inet6_sdif(skb), &udp_table, NULL); |
63058308 | 304 | } |
63058308 | 305 | |
ca065d0c ED |
306 | /* Must be called under rcu_read_lock(). |
307 | * Does increment socket refcount. | |
308 | */ | |
6e86000c | 309 | #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) |
aa976fc0 BS |
310 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
311 | const struct in6_addr *daddr, __be16 dport, int dif) | |
312 | { | |
ca065d0c ED |
313 | struct sock *sk; |
314 | ||
315 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
1801b570 | 316 | dif, 0, &udp_table, NULL); |
41c6d650 | 317 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
318 | sk = NULL; |
319 | return sk; | |
aa976fc0 BS |
320 | } |
321 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 322 | #endif |
aa976fc0 | 323 | |
cb891fa6 PA |
324 | /* do not use the scratch area len for jumbogram: their length execeeds the |
325 | * scratch area space; note that the IP6CB flags is still in the first | |
326 | * cacheline, so checking for jumbograms is cheap | |
327 | */ | |
328 | static int udp6_skb_len(struct sk_buff *skb) | |
329 | { | |
330 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); | |
331 | } | |
332 | ||
1da177e4 | 333 | /* |
67ba4152 IM |
334 | * This should be easy, if there is something there we |
335 | * return it, otherwise we block. | |
1da177e4 LT |
336 | */ |
337 | ||
1b784140 | 338 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
ec095263 | 339 | int flags, int *addr_len) |
1da177e4 LT |
340 | { |
341 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 343 | struct sk_buff *skb; |
59c2cdae | 344 | unsigned int ulen, copied; |
fd69c399 | 345 | int off, err, peeking = flags & MSG_PEEK; |
759e5d00 | 346 | int is_udplite = IS_UDPLITE(sk); |
543fc3fb | 347 | struct udp_mib __percpu *mib; |
197c949e | 348 | bool checksum_valid = false; |
f26ba175 | 349 | int is_udp4; |
1da177e4 | 350 | |
1da177e4 | 351 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 352 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 353 | |
4b340ae2 | 354 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 355 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 356 | |
1da177e4 | 357 | try_again: |
a0917e0b | 358 | off = sk_peek_offset(sk, flags); |
ec095263 | 359 | skb = __skb_recv_udp(sk, flags, &off, &err); |
1da177e4 | 360 | if (!skb) |
627d2d6b | 361 | return err; |
1da177e4 | 362 | |
cb891fa6 | 363 | ulen = udp6_skb_len(skb); |
59c2cdae | 364 | copied = len; |
627d2d6b | 365 | if (copied > ulen - off) |
366 | copied = ulen - off; | |
59c2cdae | 367 | else if (copied < ulen) |
1ab1457c | 368 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 369 | |
f26ba175 | 370 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
029a3743 | 371 | mib = __UDPX_MIB(sk, is_udp4); |
f26ba175 | 372 | |
ba4e58ec | 373 | /* |
759e5d00 HX |
374 | * If checksum is needed at all, try to do it while copying the |
375 | * data. If the data is truncated, or if we only want a partial | |
376 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 377 | */ |
ba4e58ec | 378 | |
d21dbdfe ED |
379 | if (copied < ulen || peeking || |
380 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
67a51780 PA |
381 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
382 | !__udp_lib_checksum_complete(skb); | |
197c949e | 383 | if (!checksum_valid) |
1da177e4 | 384 | goto csum_copy_err; |
ba4e58ec GR |
385 | } |
386 | ||
67a51780 PA |
387 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
388 | if (udp_skb_is_linear(skb)) | |
389 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
390 | else | |
391 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
392 | } else { | |
627d2d6b | 393 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
394 | if (err == -EINVAL) |
395 | goto csum_copy_err; | |
396 | } | |
22911fc5 | 397 | if (unlikely(err)) { |
fd69c399 | 398 | if (!peeking) { |
979402b1 | 399 | atomic_inc(&sk->sk_drops); |
029a3743 | 400 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); |
979402b1 | 401 | } |
850cbadd | 402 | kfree_skb(skb); |
627d2d6b | 403 | return err; |
22911fc5 | 404 | } |
fd69c399 | 405 | if (!peeking) |
029a3743 | 406 | SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); |
cb75994e | 407 | |
6fd1d51c | 408 | sock_recv_cmsgs(msg, sk, skb); |
1da177e4 LT |
409 | |
410 | /* Copy the address. */ | |
411 | if (msg->msg_name) { | |
342dfc30 | 412 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 413 | sin6->sin6_family = AF_INET6; |
4bedb452 | 414 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 415 | sin6->sin6_flowinfo = 0; |
1da177e4 | 416 | |
842df073 | 417 | if (is_udp4) { |
b301e82c BH |
418 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
419 | &sin6->sin6_addr); | |
842df073 HFS |
420 | sin6->sin6_scope_id = 0; |
421 | } else { | |
4e3fd7a0 | 422 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
423 | sin6->sin6_scope_id = |
424 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 425 | inet6_iif(skb)); |
1da177e4 | 426 | } |
bceaa902 | 427 | *addr_len = sizeof(*sin6); |
983695fa | 428 | |
a9ed15da SF |
429 | BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, |
430 | (struct sockaddr *)sin6); | |
1da177e4 | 431 | } |
4b261c75 | 432 | |
bcd1665e PA |
433 | if (udp_sk(sk)->gro_enabled) |
434 | udp_cmsg_recv(msg, sk, skb); | |
435 | ||
4b261c75 HFS |
436 | if (np->rxopt.all) |
437 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
438 | ||
f26ba175 | 439 | if (is_udp4) { |
1da177e4 | 440 | if (inet->cmsg_flags) |
ad959036 | 441 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 442 | sizeof(struct udphdr), off); |
1da177e4 LT |
443 | } else { |
444 | if (np->rxopt.all) | |
4b261c75 | 445 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 446 | } |
1da177e4 | 447 | |
59c2cdae | 448 | err = copied; |
1da177e4 | 449 | if (flags & MSG_TRUNC) |
759e5d00 | 450 | err = ulen; |
1da177e4 | 451 | |
850cbadd | 452 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
453 | return err; |
454 | ||
455 | csum_copy_err: | |
2276f58a PA |
456 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
457 | udp_skb_destructor)) { | |
029a3743 PA |
458 | SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); |
459 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); | |
0856f939 | 460 | } |
850cbadd | 461 | kfree_skb(skb); |
1da177e4 | 462 | |
beb39db5 ED |
463 | /* starting over for a new packet, but check if we need to yield */ |
464 | cond_resched(); | |
9cfaa8de | 465 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
466 | goto try_again; |
467 | } | |
468 | ||
a36e185e SB |
469 | DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
470 | void udpv6_encap_enable(void) | |
471 | { | |
9c480601 | 472 | static_branch_inc(&udpv6_encap_needed_key); |
a36e185e SB |
473 | } |
474 | EXPORT_SYMBOL(udpv6_encap_enable); | |
475 | ||
e7cc0824 SB |
476 | /* Handler for tunnels with arbitrary destination ports: no socket lookup, go |
477 | * through error handlers in encapsulations looking for a match. | |
478 | */ | |
479 | static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, | |
480 | struct inet6_skb_parm *opt, | |
424a7cd0 | 481 | u8 type, u8 code, int offset, __be32 info) |
e7cc0824 SB |
482 | { |
483 | int i; | |
484 | ||
485 | for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { | |
486 | int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
424a7cd0 PA |
487 | u8 type, u8 code, int offset, __be32 info); |
488 | const struct ip6_tnl_encap_ops *encap; | |
e7cc0824 | 489 | |
424a7cd0 PA |
490 | encap = rcu_dereference(ip6tun_encaps[i]); |
491 | if (!encap) | |
e7cc0824 | 492 | continue; |
424a7cd0 | 493 | handler = encap->err_handler; |
e7cc0824 SB |
494 | if (handler && !handler(skb, opt, type, code, offset, info)) |
495 | return 0; | |
496 | } | |
497 | ||
498 | return -ENOENT; | |
499 | } | |
500 | ||
a36e185e SB |
501 | /* Try to match ICMP errors to UDP tunnels by looking up a socket without |
502 | * reversing source and destination port: this will match tunnels that force the | |
503 | * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that | |
504 | * lwtunnels might actually break this assumption by being configured with | |
505 | * different destination ports on endpoints, in this case we won't be able to | |
506 | * trace ICMP messages back to them. | |
507 | * | |
e7cc0824 SB |
508 | * If this doesn't match any socket, probe tunnels with arbitrary destination |
509 | * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port | |
510 | * we've sent packets to won't necessarily match the local destination port. | |
511 | * | |
a36e185e SB |
512 | * Then ask the tunnel implementation to match the error against a valid |
513 | * association. | |
514 | * | |
e7cc0824 SB |
515 | * Return an error if we can't find a match, the socket if we need further |
516 | * processing, zero otherwise. | |
a36e185e SB |
517 | */ |
518 | static struct sock *__udp6_lib_err_encap(struct net *net, | |
519 | const struct ipv6hdr *hdr, int offset, | |
520 | struct udphdr *uh, | |
521 | struct udp_table *udptable, | |
9bfce73c | 522 | struct sock *sk, |
e7cc0824 SB |
523 | struct sk_buff *skb, |
524 | struct inet6_skb_parm *opt, | |
525 | u8 type, u8 code, __be32 info) | |
a36e185e | 526 | { |
9bfce73c | 527 | int (*lookup)(struct sock *sk, struct sk_buff *skb); |
a36e185e | 528 | int network_offset, transport_offset; |
9bfce73c | 529 | struct udp_sock *up; |
a36e185e | 530 | |
a36e185e SB |
531 | network_offset = skb_network_offset(skb); |
532 | transport_offset = skb_transport_offset(skb); | |
533 | ||
534 | /* Network header needs to point to the outer IPv6 header inside ICMP */ | |
535 | skb_reset_network_header(skb); | |
536 | ||
537 | /* Transport header needs to point to the UDP header */ | |
538 | skb_set_transport_header(skb, offset); | |
539 | ||
9bfce73c VF |
540 | if (sk) { |
541 | up = udp_sk(sk); | |
542 | ||
543 | lookup = READ_ONCE(up->encap_err_lookup); | |
544 | if (lookup && lookup(sk, skb)) | |
545 | sk = NULL; | |
546 | ||
547 | goto out; | |
548 | } | |
549 | ||
e7cc0824 SB |
550 | sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, |
551 | &hdr->saddr, uh->dest, | |
552 | inet6_iif(skb), 0, udptable, skb); | |
553 | if (sk) { | |
9bfce73c | 554 | up = udp_sk(sk); |
e7cc0824 SB |
555 | |
556 | lookup = READ_ONCE(up->encap_err_lookup); | |
557 | if (!lookup || lookup(sk, skb)) | |
558 | sk = NULL; | |
559 | } | |
560 | ||
9bfce73c | 561 | out: |
e7cc0824 SB |
562 | if (!sk) { |
563 | sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, | |
564 | offset, info)); | |
565 | } | |
a36e185e SB |
566 | |
567 | skb_set_transport_header(skb, transport_offset); | |
568 | skb_set_network_header(skb, network_offset); | |
e7cc0824 | 569 | |
a36e185e SB |
570 | return sk; |
571 | } | |
572 | ||
32bbd879 SB |
573 | int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
574 | u8 type, u8 code, int offset, __be32 info, | |
575 | struct udp_table *udptable) | |
1da177e4 LT |
576 | { |
577 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
578 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
579 | const struct in6_addr *saddr = &hdr->saddr; | |
222a011e | 580 | const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; |
67ba4152 | 581 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
a36e185e | 582 | bool tunnel = false; |
1da177e4 | 583 | struct sock *sk; |
e0d8c1b7 | 584 | int harderr; |
1da177e4 | 585 | int err; |
7304fe46 | 586 | struct net *net = dev_net(skb->dev); |
1da177e4 | 587 | |
e32ea7e7 | 588 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
4ac30c4b | 589 | inet6_iif(skb), inet6_sdif(skb), udptable, NULL); |
9bfce73c | 590 | |
d26796ae | 591 | if (!sk || udp_sk(sk)->encap_type) { |
a36e185e SB |
592 | /* No socket for error: try tunnels before discarding */ |
593 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { | |
594 | sk = __udp6_lib_err_encap(net, hdr, offset, uh, | |
9bfce73c | 595 | udptable, sk, skb, |
e7cc0824 SB |
596 | opt, type, code, info); |
597 | if (!sk) | |
598 | return 0; | |
9bfce73c VF |
599 | } else |
600 | sk = ERR_PTR(-ENOENT); | |
a36e185e | 601 | |
e7cc0824 | 602 | if (IS_ERR(sk)) { |
a36e185e SB |
603 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
604 | ICMP6_MIB_INERRORS); | |
e7cc0824 | 605 | return PTR_ERR(sk); |
a36e185e | 606 | } |
e7cc0824 | 607 | |
a36e185e | 608 | tunnel = true; |
7304fe46 | 609 | } |
1da177e4 | 610 | |
e0d8c1b7 WW |
611 | harderr = icmpv6_err_convert(type, code, &err); |
612 | np = inet6_sk(sk); | |
613 | ||
93b36cf3 HFS |
614 | if (type == ICMPV6_PKT_TOOBIG) { |
615 | if (!ip6_sk_accept_pmtu(sk)) | |
616 | goto out; | |
81aded24 | 617 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
618 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
619 | harderr = 1; | |
93b36cf3 | 620 | } |
1a462d18 | 621 | if (type == NDISC_REDIRECT) { |
a36e185e SB |
622 | if (tunnel) { |
623 | ip6_redirect(skb, sock_net(sk), inet6_iif(skb), | |
624 | sk->sk_mark, sk->sk_uid); | |
625 | } else { | |
626 | ip6_sk_redirect(skb, sk); | |
627 | } | |
1a462d18 DJ |
628 | goto out; |
629 | } | |
81aded24 | 630 | |
a36e185e | 631 | /* Tunnels don't have an application socket: don't pass errors back */ |
ac56a0b4 DH |
632 | if (tunnel) { |
633 | if (udp_sk(sk)->encap_err_rcv) | |
634 | udp_sk(sk)->encap_err_rcv(sk, skb, offset); | |
a36e185e | 635 | goto out; |
ac56a0b4 | 636 | } |
a36e185e | 637 | |
e0d8c1b7 WW |
638 | if (!np->recverr) { |
639 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
640 | goto out; | |
641 | } else { | |
1da177e4 | 642 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 643 | } |
b1faf566 | 644 | |
1da177e4 | 645 | sk->sk_err = err; |
e3ae2365 | 646 | sk_error_report(sk); |
1da177e4 | 647 | out: |
32bbd879 | 648 | return 0; |
1da177e4 LT |
649 | } |
650 | ||
a3f96c47 | 651 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
652 | { |
653 | int rc; | |
654 | ||
efe4208f | 655 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 656 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 657 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 658 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
659 | } else { |
660 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 661 | } |
f7ad74fe | 662 | |
850cbadd | 663 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
664 | if (rc < 0) { |
665 | int is_udplite = IS_UDPLITE(sk); | |
0d92efde | 666 | enum skb_drop_reason drop_reason; |
f7ad74fe BL |
667 | |
668 | /* Note that an ENOMEM error is charged twice */ | |
0d92efde | 669 | if (rc == -ENOMEM) { |
e61da9e2 | 670 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 671 | UDP_MIB_RCVBUFERRORS, is_udplite); |
0d92efde DH |
672 | drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; |
673 | } else { | |
a3ce2b10 MD |
674 | UDP6_INC_STATS(sock_net(sk), |
675 | UDP_MIB_MEMERRORS, is_udplite); | |
0d92efde DH |
676 | drop_reason = SKB_DROP_REASON_PROTO_MEM; |
677 | } | |
e61da9e2 | 678 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
0d92efde | 679 | kfree_skb_reason(skb, drop_reason); |
f7ad74fe BL |
680 | return -1; |
681 | } | |
850cbadd | 682 | |
f7ad74fe BL |
683 | return 0; |
684 | } | |
685 | ||
32bbd879 SB |
686 | static __inline__ int udpv6_err(struct sk_buff *skb, |
687 | struct inet6_skb_parm *opt, u8 type, | |
688 | u8 code, int offset, __be32 info) | |
ba4e58ec | 689 | { |
32bbd879 | 690 | return __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
691 | } |
692 | ||
cf329aa4 | 693 | static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 694 | { |
0d92efde | 695 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ba4e58ec | 696 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 697 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 698 | |
0d92efde DH |
699 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
700 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
ba4e58ec | 701 | goto drop; |
0d92efde | 702 | } |
1da177e4 | 703 | |
88ab3108 | 704 | if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { |
d7f3f621 BL |
705 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
706 | ||
707 | /* | |
708 | * This is an encapsulation socket so pass the skb to | |
709 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
710 | * fall through and pass this up the UDP socket. | |
711 | * up->encap_rcv() returns the following value: | |
712 | * =0 if skb was successfully passed to the encap | |
713 | * handler or was discarded by it. | |
714 | * >0 if skb should be passed on to UDP. | |
715 | * <0 if skb should be resubmitted as proto -N | |
716 | */ | |
717 | ||
718 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 719 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 720 | if (encap_rcv) { |
d7f3f621 BL |
721 | int ret; |
722 | ||
0a80966b TH |
723 | /* Verify checksum before giving to encap */ |
724 | if (udp_lib_checksum_complete(skb)) | |
725 | goto csum_error; | |
726 | ||
d7f3f621 BL |
727 | ret = encap_rcv(sk, skb); |
728 | if (ret <= 0) { | |
250962e4 MD |
729 | __UDP6_INC_STATS(sock_net(sk), |
730 | UDP_MIB_INDATAGRAMS, | |
731 | is_udplite); | |
d7f3f621 BL |
732 | return -ret; |
733 | } | |
734 | } | |
735 | ||
736 | /* FALLTHROUGH -- it's a UDP Packet */ | |
737 | } | |
738 | ||
ba4e58ec GR |
739 | /* |
740 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
741 | */ | |
b0a42277 | 742 | if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
743 | |
744 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
745 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
746 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
747 | goto drop; |
748 | } | |
749 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
750 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
751 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
752 | goto drop; |
753 | } | |
1da177e4 LT |
754 | } |
755 | ||
4b943fae | 756 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
757 | if (rcu_access_pointer(sk->sk_filter) && |
758 | udp_lib_checksum_complete(skb)) | |
759 | goto csum_error; | |
760 | ||
0d92efde DH |
761 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { |
762 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
a6127697 | 763 | goto drop; |
0d92efde | 764 | } |
ba4e58ec | 765 | |
e6afc8ac | 766 | udp_csum_pull_header(skb); |
cb80ef46 | 767 | |
d826eb14 | 768 | skb_dst_drop(skb); |
cb75994e | 769 | |
850cbadd | 770 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 771 | |
6a5dc9e5 | 772 | csum_error: |
0d92efde | 773 | drop_reason = SKB_DROP_REASON_UDP_CSUM; |
02c22347 | 774 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 775 | drop: |
02c22347 | 776 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 777 | atomic_inc(&sk->sk_drops); |
0d92efde | 778 | kfree_skb_reason(skb, drop_reason); |
ba4e58ec | 779 | return -1; |
1da177e4 LT |
780 | } |
781 | ||
cf329aa4 PA |
782 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
783 | { | |
784 | struct sk_buff *next, *segs; | |
785 | int ret; | |
786 | ||
787 | if (likely(!udp_unexpected_gso(sk, skb))) | |
788 | return udpv6_queue_rcv_one_skb(sk, skb); | |
789 | ||
790 | __skb_push(skb, -skb_mac_offset(skb)); | |
791 | segs = udp_rcv_segment(sk, skb, false); | |
1a186c14 | 792 | skb_list_walk_safe(segs, skb, next) { |
cf329aa4 PA |
793 | __skb_pull(skb, skb_transport_offset(skb)); |
794 | ||
000ac44d | 795 | udp_post_segment_fix_csum(skb); |
cf329aa4 PA |
796 | ret = udpv6_queue_rcv_one_skb(sk, skb); |
797 | if (ret > 0) | |
798 | ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, | |
799 | true); | |
800 | } | |
801 | return 0; | |
802 | } | |
803 | ||
5cf3d461 DH |
804 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
805 | __be16 loc_port, const struct in6_addr *loc_addr, | |
806 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
7bd2db40 | 807 | int dif, int sdif, unsigned short hnum) |
1da177e4 | 808 | { |
5cf3d461 | 809 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 810 | |
5cf3d461 DH |
811 | if (!net_eq(sock_net(sk), net)) |
812 | return false; | |
813 | ||
814 | if (udp_sk(sk)->udp_port_hash != hnum || | |
815 | sk->sk_family != PF_INET6 || | |
816 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
817 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
818 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
4c971d2f | 819 | !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || |
33b4b015 HR |
820 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
821 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
822 | return false; |
823 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
824 | return false; | |
825 | return true; | |
1da177e4 LT |
826 | } |
827 | ||
4068579e TH |
828 | static void udp6_csum_zero_error(struct sk_buff *skb) |
829 | { | |
830 | /* RFC 2460 section 8.1 says that we SHOULD log | |
831 | * this error. Well, it is reasonable. | |
832 | */ | |
ba7a46f1 JP |
833 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
834 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
835 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
836 | } |
837 | ||
1da177e4 LT |
838 | /* |
839 | * Note: called only from the BH handler context, | |
840 | * so we don't need to lock the hashes. | |
841 | */ | |
e3163493 | 842 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 843 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 844 | struct udp_table *udptable, int proto) |
1da177e4 | 845 | { |
ca065d0c | 846 | struct sock *sk, *first = NULL; |
4bedb452 | 847 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
848 | unsigned short hnum = ntohs(uh->dest); |
849 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 850 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 851 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c | 852 | int dif = inet6_iif(skb); |
7bd2db40 | 853 | int sdif = inet6_sdif(skb); |
ca065d0c ED |
854 | struct hlist_node *node; |
855 | struct sk_buff *nskb; | |
2dc41cff DH |
856 | |
857 | if (use_hash2) { | |
f0b1e64c | 858 | hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & |
73e2d5e3 | 859 | udptable->mask; |
f0b1e64c | 860 | hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
2dc41cff | 861 | start_lookup: |
73e2d5e3 | 862 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
863 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
864 | } | |
1da177e4 | 865 | |
ca065d0c ED |
866 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
867 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
7bd2db40 DM |
868 | uh->source, saddr, dif, sdif, |
869 | hnum)) | |
ca065d0c ED |
870 | continue; |
871 | /* If zero checksum and no_check is not on for | |
872 | * the socket then skip it. | |
873 | */ | |
874 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
875 | continue; | |
876 | if (!first) { | |
877 | first = sk; | |
878 | continue; | |
879 | } | |
880 | nskb = skb_clone(skb, GFP_ATOMIC); | |
881 | if (unlikely(!nskb)) { | |
882 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
883 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
884 | IS_UDPLITE(sk)); | |
885 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
886 | IS_UDPLITE(sk)); | |
ca065d0c | 887 | continue; |
95766fff | 888 | } |
a1ab77f9 | 889 | |
ca065d0c ED |
890 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
891 | consume_skb(nskb); | |
892 | } | |
a1ab77f9 | 893 | |
2dc41cff DH |
894 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
895 | if (use_hash2 && hash2 != hash2_any) { | |
896 | hash2 = hash2_any; | |
897 | goto start_lookup; | |
898 | } | |
899 | ||
ca065d0c ED |
900 | if (first) { |
901 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
902 | consume_skb(skb); | |
a1ab77f9 | 903 | } else { |
ca065d0c | 904 | kfree_skb(skb); |
02c22347 ED |
905 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
906 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 907 | } |
ba4e58ec | 908 | return 0; |
1da177e4 LT |
909 | } |
910 | ||
64f0f5d1 PA |
911 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
912 | { | |
913 | if (udp_sk_rx_dst_set(sk, dst)) { | |
914 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
915 | ||
ef57c161 | 916 | sk->sk_rx_dst_cookie = rt6_get_cookie(rt); |
64f0f5d1 PA |
917 | } |
918 | } | |
919 | ||
eb63f296 PA |
920 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
921 | * return code conversion for ip layer consumption | |
922 | */ | |
923 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
924 | struct udphdr *uh) | |
925 | { | |
926 | int ret; | |
927 | ||
928 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
e4aa33ad | 929 | skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); |
eb63f296 PA |
930 | |
931 | ret = udpv6_queue_rcv_skb(sk, skb); | |
932 | ||
84dad559 | 933 | /* a return value > 0 means to resubmit the input */ |
eb63f296 | 934 | if (ret > 0) |
84dad559 | 935 | return ret; |
eb63f296 PA |
936 | return 0; |
937 | } | |
938 | ||
645ca708 | 939 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 940 | int proto) |
1da177e4 | 941 | { |
4cf91f82 | 942 | enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ca065d0c | 943 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 944 | struct net *net = dev_net(skb->dev); |
1ab1457c | 945 | struct udphdr *uh; |
ca065d0c | 946 | struct sock *sk; |
71489e21 | 947 | bool refcounted; |
1da177e4 LT |
948 | u32 ulen = 0; |
949 | ||
950 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 951 | goto discard; |
1da177e4 | 952 | |
0660e03f ACM |
953 | saddr = &ipv6_hdr(skb)->saddr; |
954 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 955 | uh = udp_hdr(skb); |
1da177e4 LT |
956 | |
957 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
958 | if (ulen > skb->len) |
959 | goto short_packet; | |
1da177e4 | 960 | |
759e5d00 HX |
961 | if (proto == IPPROTO_UDP) { |
962 | /* UDP validates ulen. */ | |
1da177e4 | 963 | |
ba4e58ec GR |
964 | /* Check for jumbo payload */ |
965 | if (ulen == 0) | |
966 | ulen = skb->len; | |
1da177e4 | 967 | |
ba4e58ec GR |
968 | if (ulen < sizeof(*uh)) |
969 | goto short_packet; | |
1da177e4 | 970 | |
ba4e58ec GR |
971 | if (ulen < skb->len) { |
972 | if (pskb_trim_rcsum(skb, ulen)) | |
973 | goto short_packet; | |
0660e03f ACM |
974 | saddr = &ipv6_hdr(skb)->saddr; |
975 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 976 | uh = udp_hdr(skb); |
ba4e58ec | 977 | } |
ba4e58ec | 978 | } |
1da177e4 | 979 | |
759e5d00 | 980 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 981 | goto csum_error; |
759e5d00 | 982 | |
c9f2c1ae | 983 | /* Check if the socket is already available, e.g. due to early demux */ |
71489e21 | 984 | sk = skb_steal_sock(skb, &refcounted); |
c9f2c1ae PA |
985 | if (sk) { |
986 | struct dst_entry *dst = skb_dst(skb); | |
987 | int ret; | |
988 | ||
8f905c0e | 989 | if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) |
64f0f5d1 | 990 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae | 991 | |
eb63f296 | 992 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
71489e21 JS |
993 | if (refcounted) |
994 | sock_put(sk); | |
eb63f296 PA |
995 | goto report_csum_error; |
996 | } | |
c9f2c1ae | 997 | |
eb63f296 | 998 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
71489e21 JS |
999 | if (refcounted) |
1000 | sock_put(sk); | |
eb63f296 | 1001 | return ret; |
c9f2c1ae PA |
1002 | } |
1003 | ||
1ab1457c YH |
1004 | /* |
1005 | * Multicast receive code | |
1da177e4 | 1006 | */ |
ba4e58ec | 1007 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 1008 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 1009 | saddr, daddr, udptable, proto); |
1da177e4 LT |
1010 | |
1011 | /* Unicast */ | |
607c4aaf | 1012 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 1013 | if (sk) { |
eb63f296 PA |
1014 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
1015 | goto report_csum_error; | |
1016 | return udp6_unicast_rcv_skb(sk, skb, uh); | |
1da177e4 | 1017 | } |
1ab1457c | 1018 | |
4cf91f82 DA |
1019 | reason = SKB_DROP_REASON_NO_SOCKET; |
1020 | ||
eb63f296 PA |
1021 | if (!uh->check) |
1022 | goto report_csum_error; | |
4068579e | 1023 | |
cb80ef46 | 1024 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 1025 | goto discard; |
cb80ef46 BL |
1026 | |
1027 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 1028 | goto csum_error; |
cb80ef46 | 1029 | |
02c22347 | 1030 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
1031 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
1032 | ||
4cf91f82 | 1033 | kfree_skb_reason(skb, reason); |
add459aa | 1034 | return 0; |
1da177e4 | 1035 | |
1ab1457c | 1036 | short_packet: |
4cf91f82 DA |
1037 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1038 | reason = SKB_DROP_REASON_PKT_TOO_SMALL; | |
ba7a46f1 JP |
1039 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
1040 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
1041 | saddr, ntohs(uh->source), | |
1042 | ulen, skb->len, | |
1043 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 | 1044 | goto discard; |
eb63f296 PA |
1045 | |
1046 | report_csum_error: | |
1047 | udp6_csum_zero_error(skb); | |
6a5dc9e5 | 1048 | csum_error: |
4cf91f82 DA |
1049 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1050 | reason = SKB_DROP_REASON_UDP_CSUM; | |
02c22347 | 1051 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1052 | discard: |
02c22347 | 1053 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
4cf91f82 | 1054 | kfree_skb_reason(skb, reason); |
add459aa | 1055 | return 0; |
1da177e4 | 1056 | } |
ba4e58ec | 1057 | |
0bd84065 | 1058 | |
5425077d | 1059 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
1060 | __be16 loc_port, const struct in6_addr *loc_addr, | |
1061 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 1062 | int dif, int sdif) |
5425077d | 1063 | { |
0bd84065 | 1064 | unsigned short hnum = ntohs(loc_port); |
f0b1e64c | 1065 | unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
0bd84065 | 1066 | unsigned int slot2 = hash2 & udp_table.mask; |
1067 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
1068 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); | |
5425077d | 1069 | struct sock *sk; |
1070 | ||
0bd84065 | 1071 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 1072 | if (sk->sk_state == TCP_ESTABLISHED && |
5d368f03 | 1073 | inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 1074 | return sk; |
1075 | /* Only check first socket in chain */ | |
1076 | break; | |
1077 | } | |
1078 | return NULL; | |
5425077d | 1079 | } |
1080 | ||
11052589 | 1081 | void udp_v6_early_demux(struct sk_buff *skb) |
5425077d | 1082 | { |
1083 | struct net *net = dev_net(skb->dev); | |
1084 | const struct udphdr *uh; | |
1085 | struct sock *sk; | |
1086 | struct dst_entry *dst; | |
1087 | int dif = skb->dev->ifindex; | |
4297a0ef | 1088 | int sdif = inet6_sdif(skb); |
5425077d | 1089 | |
1090 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
1091 | sizeof(struct udphdr))) | |
1092 | return; | |
1093 | ||
1094 | uh = udp_hdr(skb); | |
1095 | ||
1096 | if (skb->pkt_type == PACKET_HOST) | |
1097 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
1098 | &ipv6_hdr(skb)->daddr, | |
1099 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 1100 | dif, sdif); |
5425077d | 1101 | else |
1102 | return; | |
1103 | ||
41c6d650 | 1104 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
5425077d | 1105 | return; |
1106 | ||
1107 | skb->sk = sk; | |
1108 | skb->destructor = sock_efree; | |
8f905c0e | 1109 | dst = rcu_dereference(sk->sk_rx_dst); |
5425077d | 1110 | |
1111 | if (dst) | |
ef57c161 | 1112 | dst = dst_check(dst, sk->sk_rx_dst_cookie); |
5425077d | 1113 | if (dst) { |
d24406c8 WW |
1114 | /* set noref for now. |
1115 | * any place which wants to hold dst has to call | |
1116 | * dst_hold_safe() | |
1117 | */ | |
1118 | skb_dst_set_noref(skb, dst); | |
5425077d | 1119 | } |
1120 | } | |
1121 | ||
0e219ae4 | 1122 | INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 1123 | { |
645ca708 | 1124 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
1125 | } |
1126 | ||
1da177e4 LT |
1127 | /* |
1128 | * Throw away all pending data and cancel the corking. Socket is locked. | |
1129 | */ | |
1130 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
1131 | { | |
1132 | struct udp_sock *up = udp_sk(sk); | |
1133 | ||
36d926b9 DL |
1134 | if (up->pending == AF_INET) |
1135 | udp_flush_pending_frames(sk); | |
1136 | else if (up->pending) { | |
1da177e4 LT |
1137 | up->len = 0; |
1138 | up->pending = 0; | |
1139 | ip6_flush_pending_frames(sk); | |
1ab1457c | 1140 | } |
1da177e4 LT |
1141 | } |
1142 | ||
d74bad4e AI |
1143 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
1144 | int addr_len) | |
1145 | { | |
bddc028a TH |
1146 | if (addr_len < offsetofend(struct sockaddr, sa_family)) |
1147 | return -EINVAL; | |
d74bad4e AI |
1148 | /* The following checks are replicated from __ip6_datagram_connect() |
1149 | * and intended to prevent BPF program called below from accessing | |
1150 | * bytes that are out of the bound specified by user in addr_len. | |
1151 | */ | |
1152 | if (uaddr->sa_family == AF_INET) { | |
89e9c728 | 1153 | if (ipv6_only_sock(sk)) |
d74bad4e AI |
1154 | return -EAFNOSUPPORT; |
1155 | return udp_pre_connect(sk, uaddr, addr_len); | |
1156 | } | |
1157 | ||
1158 | if (addr_len < SIN6_LEN_RFC2133) | |
1159 | return -EINVAL; | |
1160 | ||
1161 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); | |
1162 | } | |
1163 | ||
493c6be3 | 1164 | /** |
67ba4152 IM |
1165 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
1166 | * @sk: socket we are sending on | |
1167 | * @skb: sk_buff containing the filled-in UDP header | |
1168 | * (checksum field must be zeroed out) | |
b51cd7c8 AL |
1169 | * @saddr: source address |
1170 | * @daddr: destination address | |
1171 | * @len: length of packet | |
493c6be3 SS |
1172 | */ |
1173 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
1174 | const struct in6_addr *saddr, | |
1175 | const struct in6_addr *daddr, int len) | |
1176 | { | |
1177 | unsigned int offset; | |
1178 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1179 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1180 | __wsum csum = 0; |
1181 | ||
d39d938c | 1182 | if (!frags) { |
493c6be3 SS |
1183 | /* Only one fragment on the socket. */ |
1184 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1185 | skb->csum_offset = offsetof(struct udphdr, check); | |
1186 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1187 | } else { | |
1188 | /* | |
1189 | * HW-checksum won't work as there are two or more | |
1190 | * fragments on the socket so that all csums of sk_buffs | |
1191 | * should be together | |
1192 | */ | |
1193 | offset = skb_transport_offset(skb); | |
1194 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1195 | csum = skb->csum; |
493c6be3 SS |
1196 | |
1197 | skb->ip_summed = CHECKSUM_NONE; | |
1198 | ||
d39d938c VY |
1199 | do { |
1200 | csum = csum_add(csum, frags->csum); | |
1201 | } while ((frags = frags->next)); | |
493c6be3 SS |
1202 | |
1203 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1204 | csum); | |
1205 | if (uh->check == 0) | |
1206 | uh->check = CSUM_MANGLED_0; | |
1207 | } | |
1208 | } | |
1209 | ||
1da177e4 LT |
1210 | /* |
1211 | * Sending | |
1212 | */ | |
1213 | ||
bec1f6f6 WB |
1214 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1215 | struct inet_cork *cork) | |
1da177e4 | 1216 | { |
d39d938c | 1217 | struct sock *sk = skb->sk; |
1da177e4 | 1218 | struct udphdr *uh; |
1da177e4 | 1219 | int err = 0; |
b2bf1e26 | 1220 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1221 | __wsum csum = 0; |
d39d938c VY |
1222 | int offset = skb_transport_offset(skb); |
1223 | int len = skb->len - offset; | |
4094871d | 1224 | int datalen = len - sizeof(*uh); |
1da177e4 LT |
1225 | |
1226 | /* | |
1227 | * Create a UDP header | |
1228 | */ | |
4bedb452 | 1229 | uh = udp_hdr(skb); |
1958b856 DM |
1230 | uh->source = fl6->fl6_sport; |
1231 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1232 | uh->len = htons(len); |
1da177e4 LT |
1233 | uh->check = 0; |
1234 | ||
bec1f6f6 WB |
1235 | if (cork->gso_size) { |
1236 | const int hlen = skb_network_header_len(skb) + | |
1237 | sizeof(struct udphdr); | |
1238 | ||
0f149c9f WB |
1239 | if (hlen + cork->gso_size > cork->fragsize) { |
1240 | kfree_skb(skb); | |
bec1f6f6 | 1241 | return -EINVAL; |
0f149c9f | 1242 | } |
736ef37f | 1243 | if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { |
0f149c9f | 1244 | kfree_skb(skb); |
bec1f6f6 | 1245 | return -EINVAL; |
0f149c9f WB |
1246 | } |
1247 | if (udp_sk(sk)->no_check6_tx) { | |
1248 | kfree_skb(skb); | |
a8c744a8 | 1249 | return -EINVAL; |
0f149c9f | 1250 | } |
ff06342c | 1251 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || |
0f149c9f WB |
1252 | dst_xfrm(skb_dst(skb))) { |
1253 | kfree_skb(skb); | |
bec1f6f6 | 1254 | return -EIO; |
0f149c9f | 1255 | } |
bec1f6f6 | 1256 | |
4094871d JH |
1257 | if (datalen > cork->gso_size) { |
1258 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1259 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
1260 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, | |
1261 | cork->gso_size); | |
1262 | } | |
a8c744a8 | 1263 | goto csum_partial; |
bec1f6f6 WB |
1264 | } |
1265 | ||
b2bf1e26 | 1266 | if (is_udplite) |
d39d938c VY |
1267 | csum = udplite_csum(skb); |
1268 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1269 | skb->ip_summed = CHECKSUM_NONE; |
1270 | goto send; | |
1271 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
a8c744a8 | 1272 | csum_partial: |
d39d938c | 1273 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1274 | goto send; |
1275 | } else | |
d39d938c | 1276 | csum = udp_csum(skb); |
1da177e4 | 1277 | |
ba4e58ec | 1278 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1279 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1280 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1281 | if (uh->check == 0) |
f6ab0288 | 1282 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1283 | |
493c6be3 | 1284 | send: |
d39d938c | 1285 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1286 | if (err) { |
1287 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1288 | UDP6_INC_STATS(sock_net(sk), |
1289 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1290 | err = 0; |
1291 | } | |
6aef70a8 ED |
1292 | } else { |
1293 | UDP6_INC_STATS(sock_net(sk), | |
1294 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1295 | } | |
d39d938c VY |
1296 | return err; |
1297 | } | |
1298 | ||
1299 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1300 | { | |
1301 | struct sk_buff *skb; | |
1302 | struct udp_sock *up = udp_sk(sk); | |
d39d938c VY |
1303 | int err = 0; |
1304 | ||
1305 | if (up->pending == AF_INET) | |
1306 | return udp_push_pending_frames(sk); | |
1307 | ||
d39d938c VY |
1308 | skb = ip6_finish_skb(sk); |
1309 | if (!skb) | |
1310 | goto out; | |
1311 | ||
940ea00b PB |
1312 | err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, |
1313 | &inet_sk(sk)->cork.base); | |
1da177e4 LT |
1314 | out: |
1315 | up->len = 0; | |
1316 | up->pending = 0; | |
1317 | return err; | |
1318 | } | |
1319 | ||
1b784140 | 1320 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1321 | { |
1322 | struct ipv6_txoptions opt_space; | |
1323 | struct udp_sock *up = udp_sk(sk); | |
1324 | struct inet_sock *inet = inet_sk(sk); | |
1325 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1326 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1327 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1328 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1329 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1330 | struct ip6_flowlabel *flowlabel = NULL; |
5298953e PB |
1331 | struct inet_cork_full cork; |
1332 | struct flowi6 *fl6 = &cork.fl.u.ip6; | |
1da177e4 | 1333 | struct dst_entry *dst; |
26879da5 | 1334 | struct ipcm6_cookie ipc6; |
1da177e4 | 1335 | int addr_len = msg->msg_namelen; |
9f542f61 | 1336 | bool connected = false; |
1da177e4 | 1337 | int ulen = len; |
a9f59707 | 1338 | int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE; |
1da177e4 | 1339 | int err; |
b2bf1e26 | 1340 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1341 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 | 1342 | |
b515430a | 1343 | ipcm6_init(&ipc6); |
18a419ba | 1344 | ipc6.gso_size = READ_ONCE(up->gso_size); |
5fdaa88d | 1345 | ipc6.sockc.tsflags = sk->sk_tsflags; |
c6af0c22 | 1346 | ipc6.sockc.mark = sk->sk_mark; |
26879da5 | 1347 | |
1da177e4 LT |
1348 | /* destination address check */ |
1349 | if (sin6) { | |
1350 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1351 | return -EINVAL; | |
1352 | ||
1353 | switch (sin6->sin6_family) { | |
1354 | case AF_INET6: | |
1355 | if (addr_len < SIN6_LEN_RFC2133) | |
1356 | return -EINVAL; | |
1357 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1358 | if (ipv6_addr_any(daddr) && |
1359 | ipv6_addr_v4mapped(&np->saddr)) | |
1360 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1361 | daddr); | |
1da177e4 LT |
1362 | break; |
1363 | case AF_INET: | |
1364 | goto do_udp_sendmsg; | |
1365 | case AF_UNSPEC: | |
1366 | msg->msg_name = sin6 = NULL; | |
1367 | msg->msg_namelen = addr_len = 0; | |
1368 | daddr = NULL; | |
1369 | break; | |
1370 | default: | |
1371 | return -EINVAL; | |
1372 | } | |
1373 | } else if (!up->pending) { | |
1374 | if (sk->sk_state != TCP_ESTABLISHED) | |
1375 | return -EDESTADDRREQ; | |
efe4208f | 1376 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1377 | } else |
1da177e4 LT |
1378 | daddr = NULL; |
1379 | ||
1380 | if (daddr) { | |
e773e4fa | 1381 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1382 | struct sockaddr_in sin; |
1383 | sin.sin_family = AF_INET; | |
c720c7e8 | 1384 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1385 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1386 | msg->msg_name = &sin; | |
1387 | msg->msg_namelen = sizeof(sin); | |
1388 | do_udp_sendmsg: | |
89e9c728 | 1389 | if (ipv6_only_sock(sk)) |
1da177e4 | 1390 | return -ENETUNREACH; |
1b784140 | 1391 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1392 | } |
1393 | } | |
1394 | ||
1da177e4 | 1395 | /* Rough check on arithmetic overflow, |
b59e139b | 1396 | better check is made in ip6_append_data(). |
1da177e4 LT |
1397 | */ |
1398 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1399 | return -EMSGSIZE; | |
1ab1457c | 1400 | |
03485f2a | 1401 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 | 1402 | if (up->pending) { |
406c4a0a PB |
1403 | if (up->pending == AF_INET) |
1404 | return udp_sendmsg(sk, msg, len); | |
1da177e4 LT |
1405 | /* |
1406 | * There are pending frames. | |
1407 | * The socket lock must be held while it's corked. | |
1408 | */ | |
1409 | lock_sock(sk); | |
1410 | if (likely(up->pending)) { | |
1411 | if (unlikely(up->pending != AF_INET6)) { | |
1412 | release_sock(sk); | |
1413 | return -EAFNOSUPPORT; | |
1414 | } | |
1415 | dst = NULL; | |
1416 | goto do_append_data; | |
1417 | } | |
1418 | release_sock(sk); | |
1419 | } | |
1420 | ulen += sizeof(struct udphdr); | |
1421 | ||
5298953e | 1422 | memset(fl6, 0, sizeof(*fl6)); |
1da177e4 LT |
1423 | |
1424 | if (sin6) { | |
1425 | if (sin6->sin6_port == 0) | |
1426 | return -EINVAL; | |
1427 | ||
5298953e | 1428 | fl6->fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1429 | daddr = &sin6->sin6_addr; |
1430 | ||
1431 | if (np->sndflow) { | |
5298953e PB |
1432 | fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1433 | if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { | |
1434 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1435 | if (IS_ERR(flowlabel)) |
1da177e4 | 1436 | return -EINVAL; |
1da177e4 LT |
1437 | } |
1438 | } | |
1439 | ||
1440 | /* | |
1441 | * Otherwise it will be difficult to maintain | |
1442 | * sk->sk_dst_cache. | |
1443 | */ | |
1444 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1445 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1446 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1447 | |
1448 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1449 | sin6->sin6_scope_id && | |
842df073 | 1450 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
5298953e | 1451 | fl6->flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1452 | } else { |
1453 | if (sk->sk_state != TCP_ESTABLISHED) | |
1454 | return -EDESTADDRREQ; | |
1455 | ||
5298953e | 1456 | fl6->fl6_dport = inet->inet_dport; |
efe4208f | 1457 | daddr = &sk->sk_v6_daddr; |
5298953e | 1458 | fl6->flowlabel = np->flow_label; |
9f542f61 | 1459 | connected = true; |
1da177e4 LT |
1460 | } |
1461 | ||
5298953e | 1462 | if (!fl6->flowi6_oif) |
4c971d2f | 1463 | fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); |
1da177e4 | 1464 | |
5298953e PB |
1465 | if (!fl6->flowi6_oif) |
1466 | fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1467 | |
5298953e | 1468 | fl6->flowi6_uid = sk->sk_uid; |
51953d5b | 1469 | |
1da177e4 LT |
1470 | if (msg->msg_controllen) { |
1471 | opt = &opt_space; | |
1472 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1473 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1474 | ipc6.opt = opt; |
1da177e4 | 1475 | |
2e8de857 WB |
1476 | err = udp_cmsg_send(sk, msg, &ipc6.gso_size); |
1477 | if (err > 0) | |
5298953e | 1478 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, |
5fdaa88d | 1479 | &ipc6); |
1da177e4 LT |
1480 | if (err < 0) { |
1481 | fl6_sock_release(flowlabel); | |
1482 | return err; | |
1483 | } | |
5298953e PB |
1484 | if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1485 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1486 | if (IS_ERR(flowlabel)) |
1da177e4 LT |
1487 | return -EINVAL; |
1488 | } | |
1489 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1490 | opt = NULL; | |
9f542f61 | 1491 | connected = false; |
1da177e4 | 1492 | } |
45f6fad8 ED |
1493 | if (!opt) { |
1494 | opt = txopt_get(np); | |
1495 | opt_to_free = opt; | |
1496 | } | |
df9890c3 YH |
1497 | if (flowlabel) |
1498 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1499 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1500 | ipc6.opt = opt; |
1da177e4 | 1501 | |
5298953e PB |
1502 | fl6->flowi6_proto = sk->sk_protocol; |
1503 | fl6->flowi6_mark = ipc6.sockc.mark; | |
1504 | fl6->daddr = *daddr; | |
1505 | if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) | |
1506 | fl6->saddr = np->saddr; | |
1507 | fl6->fl6_sport = inet->inet_sport; | |
1ab1457c | 1508 | |
6fc88c35 | 1509 | if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { |
1cedee13 | 1510 | err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, |
5298953e PB |
1511 | (struct sockaddr *)sin6, |
1512 | &fl6->saddr); | |
1cedee13 AI |
1513 | if (err) |
1514 | goto out_no_dst; | |
1515 | if (sin6) { | |
1516 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { | |
1517 | /* BPF program rewrote IPv6-only by IPv4-mapped | |
1518 | * IPv6. It's currently unsupported. | |
1519 | */ | |
1520 | err = -ENOTSUPP; | |
1521 | goto out_no_dst; | |
1522 | } | |
1523 | if (sin6->sin6_port == 0) { | |
1524 | /* BPF program set invalid port. Reject it. */ | |
1525 | err = -EINVAL; | |
1526 | goto out_no_dst; | |
1527 | } | |
5298953e PB |
1528 | fl6->fl6_dport = sin6->sin6_port; |
1529 | fl6->daddr = sin6->sin6_addr; | |
1cedee13 AI |
1530 | } |
1531 | } | |
1532 | ||
5298953e PB |
1533 | if (ipv6_addr_any(&fl6->daddr)) |
1534 | fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
e8e36984 | 1535 | |
5298953e | 1536 | final_p = fl6_update_dst(fl6, opt, &final); |
20c59de2 | 1537 | if (final_p) |
9f542f61 | 1538 | connected = false; |
1da177e4 | 1539 | |
5298953e PB |
1540 | if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { |
1541 | fl6->flowi6_oif = np->mcast_oif; | |
9f542f61 | 1542 | connected = false; |
5298953e PB |
1543 | } else if (!fl6->flowi6_oif) |
1544 | fl6->flowi6_oif = np->ucast_oif; | |
1da177e4 | 1545 | |
5298953e | 1546 | security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); |
beb8d13b | 1547 | |
38b7097b HFS |
1548 | if (ipc6.tclass < 0) |
1549 | ipc6.tclass = np->tclass; | |
1550 | ||
5298953e | 1551 | fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); |
38b7097b | 1552 | |
5298953e | 1553 | dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); |
68d0c6d3 DM |
1554 | if (IS_ERR(dst)) { |
1555 | err = PTR_ERR(dst); | |
1556 | dst = NULL; | |
1da177e4 | 1557 | goto out; |
14e50e57 | 1558 | } |
1da177e4 | 1559 | |
26879da5 | 1560 | if (ipc6.hlimit < 0) |
5298953e | 1561 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); |
1da177e4 LT |
1562 | |
1563 | if (msg->msg_flags&MSG_CONFIRM) | |
1564 | goto do_confirm; | |
1565 | back_from_confirm: | |
1566 | ||
03485f2a VY |
1567 | /* Lockless fast path for the non-corking case */ |
1568 | if (!corkreq) { | |
1569 | struct sk_buff *skb; | |
1570 | ||
1571 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1572 | sizeof(struct udphdr), &ipc6, |
f37a4cc6 | 1573 | (struct rt6_info *)dst, |
5fdaa88d | 1574 | msg->msg_flags, &cork); |
03485f2a VY |
1575 | err = PTR_ERR(skb); |
1576 | if (!IS_ERR_OR_NULL(skb)) | |
5298953e | 1577 | err = udp_v6_send_skb(skb, fl6, &cork.base); |
40ac240c PB |
1578 | /* ip6_make_skb steals dst reference */ |
1579 | goto out_no_dst; | |
03485f2a VY |
1580 | } |
1581 | ||
1da177e4 LT |
1582 | lock_sock(sk); |
1583 | if (unlikely(up->pending)) { | |
1584 | /* The socket is already corked while preparing it. */ | |
1585 | /* ... which is an evident application bug. --ANK */ | |
1586 | release_sock(sk); | |
1587 | ||
ba7a46f1 | 1588 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1589 | err = -EINVAL; |
1590 | goto out; | |
1591 | } | |
1592 | ||
1593 | up->pending = AF_INET6; | |
1594 | ||
1595 | do_append_data: | |
26879da5 WW |
1596 | if (ipc6.dontfrag < 0) |
1597 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1598 | up->len += ulen; |
26879da5 | 1599 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
5298953e | 1600 | &ipc6, fl6, (struct rt6_info *)dst, |
5fdaa88d | 1601 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
1da177e4 LT |
1602 | if (err) |
1603 | udp_v6_flush_pending_frames(sk); | |
1604 | else if (!corkreq) | |
4c0a6cb0 | 1605 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1606 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1607 | up->pending = 0; | |
1da177e4 | 1608 | |
03485f2a VY |
1609 | if (err > 0) |
1610 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1611 | release_sock(sk); | |
1612 | ||
1da177e4 | 1613 | out: |
a3c96089 | 1614 | dst_release(dst); |
1cedee13 | 1615 | out_no_dst: |
1da177e4 | 1616 | fl6_sock_release(flowlabel); |
45f6fad8 | 1617 | txopt_put(opt_to_free); |
cd562c98 | 1618 | if (!err) |
1da177e4 | 1619 | return len; |
a18135eb DM |
1620 | /* |
1621 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1622 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1623 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1624 | * things). We could add another new stat but at least for now that | |
1625 | * seems like overkill. | |
1626 | */ | |
1627 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1628 | UDP6_INC_STATS(sock_net(sk), |
1629 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1630 | } |
1da177e4 LT |
1631 | return err; |
1632 | ||
1633 | do_confirm: | |
0dec879f | 1634 | if (msg->msg_flags & MSG_PROBE) |
5298953e | 1635 | dst_confirm_neigh(dst, &fl6->daddr); |
1da177e4 LT |
1636 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1637 | goto back_from_confirm; | |
1638 | err = 0; | |
1639 | goto out; | |
1640 | } | |
1641 | ||
7d06b2e0 | 1642 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1643 | { |
44046a59 | 1644 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 1645 | lock_sock(sk); |
a8b897c7 PA |
1646 | |
1647 | /* protects from races with udp_abort() */ | |
1648 | sock_set_flag(sk, SOCK_DEAD); | |
1da177e4 LT |
1649 | udp_v6_flush_pending_frames(sk); |
1650 | release_sock(sk); | |
1651 | ||
60fb9567 PA |
1652 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { |
1653 | if (up->encap_type) { | |
1654 | void (*encap_destroy)(struct sock *sk); | |
1655 | encap_destroy = READ_ONCE(up->encap_destroy); | |
1656 | if (encap_destroy) | |
1657 | encap_destroy(sk); | |
1658 | } | |
a4a600dd | 1659 | if (up->encap_enabled) { |
9c480601 | 1660 | static_branch_dec(&udpv6_encap_needed_key); |
a4a600dd XL |
1661 | udp_encap_disable(); |
1662 | } | |
44046a59 | 1663 | } |
1da177e4 LT |
1664 | } |
1665 | ||
1666 | /* | |
1667 | * Socket option code for UDP | |
1668 | */ | |
a7b75c5a CH |
1669 | int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
1670 | unsigned int optlen) | |
3fdadf7d | 1671 | { |
db8dac20 | 1672 | if (level == SOL_UDP || level == SOL_UDPLITE) |
91ac1cca | 1673 | return udp_lib_setsockopt(sk, level, optname, |
a7b75c5a | 1674 | optval, optlen, |
4c0a6cb0 | 1675 | udp_v6_push_pending_frames); |
ba4e58ec | 1676 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1677 | } |
1678 | ||
ba4e58ec GR |
1679 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1680 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1681 | { |
db8dac20 | 1682 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1683 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1684 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1685 | } |
1686 | ||
11052589 | 1687 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1688 | .handler = udpv6_rcv, |
1689 | .err_handler = udpv6_err, | |
1690 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1691 | }; | |
1692 | ||
1693 | /* ------------------------------------------------------------------------ */ | |
1694 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1695 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1696 | { |
17ef66af LC |
1697 | if (v == SEQ_START_TOKEN) { |
1698 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1699 | } else { | |
1700 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1701 | struct inet_sock *inet = inet_sk(v); | |
1702 | __u16 srcp = ntohs(inet->inet_sport); | |
1703 | __u16 destp = ntohs(inet->inet_dport); | |
6c206b20 PA |
1704 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
1705 | udp_rqueue_get(v), bucket); | |
17ef66af | 1706 | } |
1da177e4 LT |
1707 | return 0; |
1708 | } | |
1709 | ||
c3506372 | 1710 | const struct seq_operations udp6_seq_ops = { |
a3d2599b CH |
1711 | .start = udp_seq_start, |
1712 | .next = udp_seq_next, | |
1713 | .stop = udp_seq_stop, | |
1714 | .show = udp6_seq_show, | |
1715 | }; | |
c3506372 | 1716 | EXPORT_SYMBOL(udp6_seq_ops); |
73cb88ec | 1717 | |
1da177e4 | 1718 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 | 1719 | .family = AF_INET6, |
645ca708 | 1720 | .udp_table = &udp_table, |
1da177e4 LT |
1721 | }; |
1722 | ||
2c8c1e72 | 1723 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1724 | { |
c3506372 CH |
1725 | if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, |
1726 | sizeof(struct udp_iter_state), &udp6_seq_afinfo)) | |
a3d2599b CH |
1727 | return -ENOMEM; |
1728 | return 0; | |
1da177e4 LT |
1729 | } |
1730 | ||
ec120da6 IM |
1731 | void udp6_proc_exit(struct net *net) |
1732 | { | |
a3d2599b | 1733 | remove_proc_entry("udp6", net->proc_net); |
1da177e4 LT |
1734 | } |
1735 | #endif /* CONFIG_PROC_FS */ | |
1736 | ||
1737 | /* ------------------------------------------------------------------------ */ | |
1738 | ||
1739 | struct proto udpv6_prot = { | |
1e802951 TZ |
1740 | .name = "UDPv6", |
1741 | .owner = THIS_MODULE, | |
1742 | .close = udp_lib_close, | |
d74bad4e | 1743 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1744 | .connect = ip6_datagram_connect, |
1745 | .disconnect = udp_disconnect, | |
1746 | .ioctl = udp_ioctl, | |
d38afeec | 1747 | .init = udpv6_init_sock, |
1e802951 TZ |
1748 | .destroy = udpv6_destroy_sock, |
1749 | .setsockopt = udpv6_setsockopt, | |
1750 | .getsockopt = udpv6_getsockopt, | |
1751 | .sendmsg = udpv6_sendmsg, | |
1752 | .recvmsg = udpv6_recvmsg, | |
1753 | .release_cb = ip6_datagram_release_cb, | |
1754 | .hash = udp_lib_hash, | |
1755 | .unhash = udp_lib_unhash, | |
1756 | .rehash = udp_v6_rehash, | |
1757 | .get_port = udp_v6_get_port, | |
91a760b2 | 1758 | .put_port = udp_lib_unhash, |
8a59f9d1 CW |
1759 | #ifdef CONFIG_BPF_SYSCALL |
1760 | .psock_update_sk_prot = udp_bpf_update_proto, | |
1761 | #endif | |
0defbb0a | 1762 | |
1e802951 | 1763 | .memory_allocated = &udp_memory_allocated, |
0defbb0a ED |
1764 | .per_cpu_fw_alloc = &udp_memory_per_cpu_fw_alloc, |
1765 | ||
1e802951 TZ |
1766 | .sysctl_mem = sysctl_udp_mem, |
1767 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), | |
1768 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), | |
1769 | .obj_size = sizeof(struct udp6_sock), | |
1770 | .h.udp_table = &udp_table, | |
1e802951 | 1771 | .diag_destroy = udp_abort, |
1da177e4 LT |
1772 | }; |
1773 | ||
1da177e4 LT |
1774 | static struct inet_protosw udpv6_protosw = { |
1775 | .type = SOCK_DGRAM, | |
1776 | .protocol = IPPROTO_UDP, | |
1777 | .prot = &udpv6_prot, | |
1778 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1779 | .flags = INET_PROTOSW_PERMANENT, |
1780 | }; | |
1781 | ||
7f4e4868 | 1782 | int __init udpv6_init(void) |
1da177e4 | 1783 | { |
7f4e4868 DL |
1784 | int ret; |
1785 | ||
3336288a VY |
1786 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1787 | if (ret) | |
c6b641a4 | 1788 | goto out; |
3336288a | 1789 | |
7f4e4868 DL |
1790 | ret = inet6_register_protosw(&udpv6_protosw); |
1791 | if (ret) | |
1792 | goto out_udpv6_protocol; | |
1793 | out: | |
1794 | return ret; | |
1795 | ||
1796 | out_udpv6_protocol: | |
1797 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1798 | goto out; | |
1799 | } | |
1800 | ||
09f7709f | 1801 | void udpv6_exit(void) |
7f4e4868 DL |
1802 | { |
1803 | inet6_unregister_protosw(&udpv6_protosw); | |
1804 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1805 | } |