Commit | Line | Data |
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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 | { | |
8a3854c7 | 67 | udp_lib_init_sock(sk); |
d38afeec | 68 | sk->sk_destruct = udpv6_destruct_sock; |
8f279fb0 | 69 | set_bit(SOCK_SUPPORT_ZC, &sk->sk_socket->flags); |
d38afeec KI |
70 | return 0; |
71 | } | |
72 | ||
6eada011 ED |
73 | static u32 udp6_ehashfn(const struct net *net, |
74 | const struct in6_addr *laddr, | |
75 | const u16 lport, | |
76 | const struct in6_addr *faddr, | |
77 | const __be16 fport) | |
b50026b5 | 78 | { |
1bbdceef HFS |
79 | static u32 udp6_ehash_secret __read_mostly; |
80 | static u32 udp_ipv6_hash_secret __read_mostly; | |
81 | ||
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, |
1bbdceef | 93 | udp_ipv6_hash_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 | ||
a57066b1 DM |
162 | static struct sock *lookup_reuseport(struct net *net, struct sock *sk, |
163 | struct sk_buff *skb, | |
164 | const struct in6_addr *saddr, | |
165 | __be16 sport, | |
166 | const struct in6_addr *daddr, | |
167 | unsigned int hnum) | |
2a08748c JS |
168 | { |
169 | struct sock *reuse_sk = NULL; | |
170 | u32 hash; | |
171 | ||
172 | if (sk->sk_reuseport && sk->sk_state != TCP_ESTABLISHED) { | |
173 | hash = udp6_ehashfn(net, daddr, hnum, saddr, sport); | |
174 | reuse_sk = reuseport_select_sock(sk, hash, skb, | |
175 | sizeof(struct udphdr)); | |
2a08748c JS |
176 | } |
177 | return reuse_sk; | |
178 | } | |
179 | ||
d1e37288 | 180 | /* called with rcu_read_lock() */ |
fddc17de ED |
181 | static struct sock *udp6_lib_lookup2(struct net *net, |
182 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 | 183 | const struct in6_addr *daddr, unsigned int hnum, |
73545373 TB |
184 | int dif, int sdif, struct udp_hslot *hslot2, |
185 | struct sk_buff *skb) | |
fddc17de ED |
186 | { |
187 | struct sock *sk, *result; | |
e94a62f5 | 188 | int score, badness; |
fddc17de | 189 | |
fddc17de ED |
190 | result = NULL; |
191 | badness = -1; | |
ca065d0c | 192 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 193 | score = compute_score(sk, net, saddr, sport, |
73545373 | 194 | daddr, hnum, dif, sdif); |
fddc17de | 195 | if (score > badness) { |
2a08748c JS |
196 | result = lookup_reuseport(net, sk, skb, |
197 | saddr, sport, daddr, hnum); | |
a57066b1 | 198 | /* Fall back to scoring if group has connections */ |
69421bf9 | 199 | if (result && !reuseport_has_conns(sk)) |
2a08748c JS |
200 | return result; |
201 | ||
a57066b1 | 202 | result = result ? : sk; |
ca065d0c | 203 | badness = score; |
fddc17de ED |
204 | } |
205 | } | |
fddc17de ED |
206 | return result; |
207 | } | |
208 | ||
6d4201b1 JS |
209 | static inline struct sock *udp6_lookup_run_bpf(struct net *net, |
210 | struct udp_table *udptable, | |
211 | struct sk_buff *skb, | |
212 | const struct in6_addr *saddr, | |
213 | __be16 sport, | |
214 | const struct in6_addr *daddr, | |
f8931565 | 215 | u16 hnum, const int dif) |
6d4201b1 JS |
216 | { |
217 | struct sock *sk, *reuse_sk; | |
218 | bool no_reuseport; | |
219 | ||
ba6aac15 | 220 | if (udptable != net->ipv4.udp_table) |
6d4201b1 JS |
221 | return NULL; /* only UDP is supported */ |
222 | ||
f8931565 MP |
223 | no_reuseport = bpf_sk_lookup_run_v6(net, IPPROTO_UDP, saddr, sport, |
224 | daddr, hnum, dif, &sk); | |
6d4201b1 JS |
225 | if (no_reuseport || IS_ERR_OR_NULL(sk)) |
226 | return sk; | |
227 | ||
228 | reuse_sk = lookup_reuseport(net, sk, skb, saddr, sport, daddr, hnum); | |
c64c9c28 | 229 | if (reuse_sk) |
6d4201b1 JS |
230 | sk = reuse_sk; |
231 | return sk; | |
232 | } | |
233 | ||
ca065d0c | 234 | /* rcu_read_lock() must be held */ |
fce82338 | 235 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
236 | const struct in6_addr *saddr, __be16 sport, |
237 | const struct in6_addr *daddr, __be16 dport, | |
238 | int dif, int sdif, struct udp_table *udptable, | |
239 | struct sk_buff *skb) | |
1da177e4 | 240 | { |
1da177e4 | 241 | unsigned short hnum = ntohs(dport); |
23b0269e PO |
242 | unsigned int hash2, slot2; |
243 | struct udp_hslot *hslot2; | |
6d4201b1 | 244 | struct sock *result, *sk; |
645ca708 | 245 | |
23b0269e PO |
246 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
247 | slot2 = hash2 & udptable->mask; | |
248 | hslot2 = &udptable->hash2[slot2]; | |
249 | ||
6d4201b1 | 250 | /* Lookup connected or non-wildcard sockets */ |
23b0269e | 251 | result = udp6_lib_lookup2(net, saddr, sport, |
73545373 | 252 | daddr, hnum, dif, sdif, |
23b0269e | 253 | hslot2, skb); |
6d4201b1 JS |
254 | if (!IS_ERR_OR_NULL(result) && result->sk_state == TCP_ESTABLISHED) |
255 | goto done; | |
256 | ||
257 | /* Lookup redirect from BPF */ | |
258 | if (static_branch_unlikely(&bpf_sk_lookup_enabled)) { | |
259 | sk = udp6_lookup_run_bpf(net, udptable, skb, | |
f8931565 | 260 | saddr, sport, daddr, hnum, dif); |
6d4201b1 JS |
261 | if (sk) { |
262 | result = sk; | |
263 | goto done; | |
264 | } | |
265 | } | |
23b0269e | 266 | |
6d4201b1 JS |
267 | /* Got non-wildcard socket or error on first lookup */ |
268 | if (result) | |
269 | goto done; | |
fddc17de | 270 | |
6d4201b1 JS |
271 | /* Lookup wildcard sockets */ |
272 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); | |
273 | slot2 = hash2 & udptable->mask; | |
274 | hslot2 = &udptable->hash2[slot2]; | |
275 | ||
276 | result = udp6_lib_lookup2(net, saddr, sport, | |
277 | &in6addr_any, hnum, dif, sdif, | |
278 | hslot2, skb); | |
279 | done: | |
26f8113c | 280 | if (IS_ERR(result)) |
23b0269e | 281 | return NULL; |
1da177e4 LT |
282 | return result; |
283 | } | |
fce82338 | 284 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 285 | |
607c4aaf KK |
286 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
287 | __be16 sport, __be16 dport, | |
645ca708 | 288 | struct udp_table *udptable) |
607c4aaf | 289 | { |
b71d1d42 | 290 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 291 | |
ed7cbbce | 292 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 293 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 294 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
295 | } |
296 | ||
7b58e63e | 297 | struct sock *udp6_lib_lookup_skb(const struct sk_buff *skb, |
63058308 TH |
298 | __be16 sport, __be16 dport) |
299 | { | |
300 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
ba6aac15 | 301 | struct net *net = dev_net(skb->dev); |
63058308 | 302 | |
ba6aac15 | 303 | return __udp6_lib_lookup(net, &iph->saddr, sport, |
63058308 | 304 | &iph->daddr, dport, inet6_iif(skb), |
ba6aac15 | 305 | inet6_sdif(skb), net->ipv4.udp_table, NULL); |
63058308 | 306 | } |
63058308 | 307 | |
ca065d0c ED |
308 | /* Must be called under rcu_read_lock(). |
309 | * Does increment socket refcount. | |
310 | */ | |
6e86000c | 311 | #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) |
aa976fc0 BS |
312 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
313 | const struct in6_addr *daddr, __be16 dport, int dif) | |
314 | { | |
ca065d0c ED |
315 | struct sock *sk; |
316 | ||
317 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
ba6aac15 | 318 | dif, 0, net->ipv4.udp_table, NULL); |
41c6d650 | 319 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
320 | sk = NULL; |
321 | return sk; | |
aa976fc0 BS |
322 | } |
323 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 324 | #endif |
aa976fc0 | 325 | |
cb891fa6 PA |
326 | /* do not use the scratch area len for jumbogram: their length execeeds the |
327 | * scratch area space; note that the IP6CB flags is still in the first | |
328 | * cacheline, so checking for jumbograms is cheap | |
329 | */ | |
330 | static int udp6_skb_len(struct sk_buff *skb) | |
331 | { | |
332 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); | |
333 | } | |
334 | ||
1da177e4 | 335 | /* |
67ba4152 IM |
336 | * This should be easy, if there is something there we |
337 | * return it, otherwise we block. | |
1da177e4 LT |
338 | */ |
339 | ||
1b784140 | 340 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
ec095263 | 341 | int flags, int *addr_len) |
1da177e4 LT |
342 | { |
343 | struct ipv6_pinfo *np = inet6_sk(sk); | |
344 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 345 | struct sk_buff *skb; |
59c2cdae | 346 | unsigned int ulen, copied; |
fd69c399 | 347 | int off, err, peeking = flags & MSG_PEEK; |
759e5d00 | 348 | int is_udplite = IS_UDPLITE(sk); |
543fc3fb | 349 | struct udp_mib __percpu *mib; |
197c949e | 350 | bool checksum_valid = false; |
f26ba175 | 351 | int is_udp4; |
1da177e4 | 352 | |
1da177e4 | 353 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 354 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 355 | |
4b340ae2 | 356 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 357 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 358 | |
1da177e4 | 359 | try_again: |
a0917e0b | 360 | off = sk_peek_offset(sk, flags); |
ec095263 | 361 | skb = __skb_recv_udp(sk, flags, &off, &err); |
1da177e4 | 362 | if (!skb) |
627d2d6b | 363 | return err; |
1da177e4 | 364 | |
cb891fa6 | 365 | ulen = udp6_skb_len(skb); |
59c2cdae | 366 | copied = len; |
627d2d6b | 367 | if (copied > ulen - off) |
368 | copied = ulen - off; | |
59c2cdae | 369 | else if (copied < ulen) |
1ab1457c | 370 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 371 | |
f26ba175 | 372 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
029a3743 | 373 | mib = __UDPX_MIB(sk, is_udp4); |
f26ba175 | 374 | |
ba4e58ec | 375 | /* |
759e5d00 HX |
376 | * If checksum is needed at all, try to do it while copying the |
377 | * data. If the data is truncated, or if we only want a partial | |
378 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 379 | */ |
ba4e58ec | 380 | |
d21dbdfe ED |
381 | if (copied < ulen || peeking || |
382 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
67a51780 PA |
383 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
384 | !__udp_lib_checksum_complete(skb); | |
197c949e | 385 | if (!checksum_valid) |
1da177e4 | 386 | goto csum_copy_err; |
ba4e58ec GR |
387 | } |
388 | ||
67a51780 PA |
389 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
390 | if (udp_skb_is_linear(skb)) | |
391 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
392 | else | |
393 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
394 | } else { | |
627d2d6b | 395 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
396 | if (err == -EINVAL) |
397 | goto csum_copy_err; | |
398 | } | |
22911fc5 | 399 | if (unlikely(err)) { |
fd69c399 | 400 | if (!peeking) { |
979402b1 | 401 | atomic_inc(&sk->sk_drops); |
029a3743 | 402 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); |
979402b1 | 403 | } |
850cbadd | 404 | kfree_skb(skb); |
627d2d6b | 405 | return err; |
22911fc5 | 406 | } |
fd69c399 | 407 | if (!peeking) |
029a3743 | 408 | SNMP_INC_STATS(mib, UDP_MIB_INDATAGRAMS); |
cb75994e | 409 | |
6fd1d51c | 410 | sock_recv_cmsgs(msg, sk, skb); |
1da177e4 LT |
411 | |
412 | /* Copy the address. */ | |
413 | if (msg->msg_name) { | |
342dfc30 | 414 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 415 | sin6->sin6_family = AF_INET6; |
4bedb452 | 416 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 417 | sin6->sin6_flowinfo = 0; |
1da177e4 | 418 | |
842df073 | 419 | if (is_udp4) { |
b301e82c BH |
420 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
421 | &sin6->sin6_addr); | |
842df073 HFS |
422 | sin6->sin6_scope_id = 0; |
423 | } else { | |
4e3fd7a0 | 424 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
425 | sin6->sin6_scope_id = |
426 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 427 | inet6_iif(skb)); |
1da177e4 | 428 | } |
bceaa902 | 429 | *addr_len = sizeof(*sin6); |
983695fa | 430 | |
a9ed15da SF |
431 | BPF_CGROUP_RUN_PROG_UDP6_RECVMSG_LOCK(sk, |
432 | (struct sockaddr *)sin6); | |
1da177e4 | 433 | } |
4b261c75 | 434 | |
bcd1665e PA |
435 | if (udp_sk(sk)->gro_enabled) |
436 | udp_cmsg_recv(msg, sk, skb); | |
437 | ||
4b261c75 HFS |
438 | if (np->rxopt.all) |
439 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
440 | ||
f26ba175 | 441 | if (is_udp4) { |
1da177e4 | 442 | if (inet->cmsg_flags) |
ad959036 | 443 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 444 | sizeof(struct udphdr), off); |
1da177e4 LT |
445 | } else { |
446 | if (np->rxopt.all) | |
4b261c75 | 447 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 448 | } |
1da177e4 | 449 | |
59c2cdae | 450 | err = copied; |
1da177e4 | 451 | if (flags & MSG_TRUNC) |
759e5d00 | 452 | err = ulen; |
1da177e4 | 453 | |
850cbadd | 454 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
455 | return err; |
456 | ||
457 | csum_copy_err: | |
2276f58a PA |
458 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
459 | udp_skb_destructor)) { | |
029a3743 PA |
460 | SNMP_INC_STATS(mib, UDP_MIB_CSUMERRORS); |
461 | SNMP_INC_STATS(mib, UDP_MIB_INERRORS); | |
0856f939 | 462 | } |
850cbadd | 463 | kfree_skb(skb); |
1da177e4 | 464 | |
beb39db5 ED |
465 | /* starting over for a new packet, but check if we need to yield */ |
466 | cond_resched(); | |
9cfaa8de | 467 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
468 | goto try_again; |
469 | } | |
470 | ||
a36e185e SB |
471 | DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
472 | void udpv6_encap_enable(void) | |
473 | { | |
9c480601 | 474 | static_branch_inc(&udpv6_encap_needed_key); |
a36e185e SB |
475 | } |
476 | EXPORT_SYMBOL(udpv6_encap_enable); | |
477 | ||
e7cc0824 SB |
478 | /* Handler for tunnels with arbitrary destination ports: no socket lookup, go |
479 | * through error handlers in encapsulations looking for a match. | |
480 | */ | |
481 | static int __udp6_lib_err_encap_no_sk(struct sk_buff *skb, | |
482 | struct inet6_skb_parm *opt, | |
424a7cd0 | 483 | u8 type, u8 code, int offset, __be32 info) |
e7cc0824 SB |
484 | { |
485 | int i; | |
486 | ||
487 | for (i = 0; i < MAX_IPTUN_ENCAP_OPS; i++) { | |
488 | int (*handler)(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
424a7cd0 PA |
489 | u8 type, u8 code, int offset, __be32 info); |
490 | const struct ip6_tnl_encap_ops *encap; | |
e7cc0824 | 491 | |
424a7cd0 PA |
492 | encap = rcu_dereference(ip6tun_encaps[i]); |
493 | if (!encap) | |
e7cc0824 | 494 | continue; |
424a7cd0 | 495 | handler = encap->err_handler; |
e7cc0824 SB |
496 | if (handler && !handler(skb, opt, type, code, offset, info)) |
497 | return 0; | |
498 | } | |
499 | ||
500 | return -ENOENT; | |
501 | } | |
502 | ||
a36e185e SB |
503 | /* Try to match ICMP errors to UDP tunnels by looking up a socket without |
504 | * reversing source and destination port: this will match tunnels that force the | |
505 | * same destination port on both endpoints (e.g. VXLAN, GENEVE). Note that | |
506 | * lwtunnels might actually break this assumption by being configured with | |
507 | * different destination ports on endpoints, in this case we won't be able to | |
508 | * trace ICMP messages back to them. | |
509 | * | |
e7cc0824 SB |
510 | * If this doesn't match any socket, probe tunnels with arbitrary destination |
511 | * ports (e.g. FoU, GUE): there, the receiving socket is useless, as the port | |
512 | * we've sent packets to won't necessarily match the local destination port. | |
513 | * | |
a36e185e SB |
514 | * Then ask the tunnel implementation to match the error against a valid |
515 | * association. | |
516 | * | |
e7cc0824 SB |
517 | * Return an error if we can't find a match, the socket if we need further |
518 | * processing, zero otherwise. | |
a36e185e SB |
519 | */ |
520 | static struct sock *__udp6_lib_err_encap(struct net *net, | |
521 | const struct ipv6hdr *hdr, int offset, | |
522 | struct udphdr *uh, | |
523 | struct udp_table *udptable, | |
9bfce73c | 524 | struct sock *sk, |
e7cc0824 SB |
525 | struct sk_buff *skb, |
526 | struct inet6_skb_parm *opt, | |
527 | u8 type, u8 code, __be32 info) | |
a36e185e | 528 | { |
9bfce73c | 529 | int (*lookup)(struct sock *sk, struct sk_buff *skb); |
a36e185e | 530 | int network_offset, transport_offset; |
9bfce73c | 531 | struct udp_sock *up; |
a36e185e | 532 | |
a36e185e SB |
533 | network_offset = skb_network_offset(skb); |
534 | transport_offset = skb_transport_offset(skb); | |
535 | ||
536 | /* Network header needs to point to the outer IPv6 header inside ICMP */ | |
537 | skb_reset_network_header(skb); | |
538 | ||
539 | /* Transport header needs to point to the UDP header */ | |
540 | skb_set_transport_header(skb, offset); | |
541 | ||
9bfce73c VF |
542 | if (sk) { |
543 | up = udp_sk(sk); | |
544 | ||
545 | lookup = READ_ONCE(up->encap_err_lookup); | |
546 | if (lookup && lookup(sk, skb)) | |
547 | sk = NULL; | |
548 | ||
549 | goto out; | |
550 | } | |
551 | ||
e7cc0824 SB |
552 | sk = __udp6_lib_lookup(net, &hdr->daddr, uh->source, |
553 | &hdr->saddr, uh->dest, | |
554 | inet6_iif(skb), 0, udptable, skb); | |
555 | if (sk) { | |
9bfce73c | 556 | up = udp_sk(sk); |
e7cc0824 SB |
557 | |
558 | lookup = READ_ONCE(up->encap_err_lookup); | |
559 | if (!lookup || lookup(sk, skb)) | |
560 | sk = NULL; | |
561 | } | |
562 | ||
9bfce73c | 563 | out: |
e7cc0824 SB |
564 | if (!sk) { |
565 | sk = ERR_PTR(__udp6_lib_err_encap_no_sk(skb, opt, type, code, | |
566 | offset, info)); | |
567 | } | |
a36e185e SB |
568 | |
569 | skb_set_transport_header(skb, transport_offset); | |
570 | skb_set_network_header(skb, network_offset); | |
e7cc0824 | 571 | |
a36e185e SB |
572 | return sk; |
573 | } | |
574 | ||
32bbd879 SB |
575 | int __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
576 | u8 type, u8 code, int offset, __be32 info, | |
577 | struct udp_table *udptable) | |
1da177e4 LT |
578 | { |
579 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
580 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
581 | const struct in6_addr *saddr = &hdr->saddr; | |
222a011e | 582 | const struct in6_addr *daddr = seg6_get_daddr(skb, opt) ? : &hdr->daddr; |
67ba4152 | 583 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
a36e185e | 584 | bool tunnel = false; |
1da177e4 | 585 | struct sock *sk; |
e0d8c1b7 | 586 | int harderr; |
1da177e4 | 587 | int err; |
7304fe46 | 588 | struct net *net = dev_net(skb->dev); |
1da177e4 | 589 | |
e32ea7e7 | 590 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
4ac30c4b | 591 | inet6_iif(skb), inet6_sdif(skb), udptable, NULL); |
9bfce73c | 592 | |
d26796ae | 593 | if (!sk || udp_sk(sk)->encap_type) { |
a36e185e SB |
594 | /* No socket for error: try tunnels before discarding */ |
595 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { | |
596 | sk = __udp6_lib_err_encap(net, hdr, offset, uh, | |
9bfce73c | 597 | udptable, sk, skb, |
e7cc0824 SB |
598 | opt, type, code, info); |
599 | if (!sk) | |
600 | return 0; | |
9bfce73c VF |
601 | } else |
602 | sk = ERR_PTR(-ENOENT); | |
a36e185e | 603 | |
e7cc0824 | 604 | if (IS_ERR(sk)) { |
a36e185e SB |
605 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
606 | ICMP6_MIB_INERRORS); | |
e7cc0824 | 607 | return PTR_ERR(sk); |
a36e185e | 608 | } |
e7cc0824 | 609 | |
a36e185e | 610 | tunnel = true; |
7304fe46 | 611 | } |
1da177e4 | 612 | |
e0d8c1b7 WW |
613 | harderr = icmpv6_err_convert(type, code, &err); |
614 | np = inet6_sk(sk); | |
615 | ||
93b36cf3 HFS |
616 | if (type == ICMPV6_PKT_TOOBIG) { |
617 | if (!ip6_sk_accept_pmtu(sk)) | |
618 | goto out; | |
81aded24 | 619 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
620 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
621 | harderr = 1; | |
93b36cf3 | 622 | } |
1a462d18 | 623 | if (type == NDISC_REDIRECT) { |
a36e185e SB |
624 | if (tunnel) { |
625 | ip6_redirect(skb, sock_net(sk), inet6_iif(skb), | |
626 | sk->sk_mark, sk->sk_uid); | |
627 | } else { | |
628 | ip6_sk_redirect(skb, sk); | |
629 | } | |
1a462d18 DJ |
630 | goto out; |
631 | } | |
81aded24 | 632 | |
a36e185e | 633 | /* Tunnels don't have an application socket: don't pass errors back */ |
ac56a0b4 DH |
634 | if (tunnel) { |
635 | if (udp_sk(sk)->encap_err_rcv) | |
42fb06b3 DH |
636 | udp_sk(sk)->encap_err_rcv(sk, skb, err, uh->dest, |
637 | ntohl(info), (u8 *)(uh+1)); | |
a36e185e | 638 | goto out; |
ac56a0b4 | 639 | } |
a36e185e | 640 | |
e0d8c1b7 WW |
641 | if (!np->recverr) { |
642 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
643 | goto out; | |
644 | } else { | |
1da177e4 | 645 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 646 | } |
b1faf566 | 647 | |
1da177e4 | 648 | sk->sk_err = err; |
e3ae2365 | 649 | sk_error_report(sk); |
1da177e4 | 650 | out: |
32bbd879 | 651 | return 0; |
1da177e4 LT |
652 | } |
653 | ||
a3f96c47 | 654 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
655 | { |
656 | int rc; | |
657 | ||
efe4208f | 658 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 659 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 660 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 661 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
662 | } else { |
663 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 664 | } |
f7ad74fe | 665 | |
850cbadd | 666 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
667 | if (rc < 0) { |
668 | int is_udplite = IS_UDPLITE(sk); | |
0d92efde | 669 | enum skb_drop_reason drop_reason; |
f7ad74fe BL |
670 | |
671 | /* Note that an ENOMEM error is charged twice */ | |
0d92efde | 672 | if (rc == -ENOMEM) { |
e61da9e2 | 673 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 674 | UDP_MIB_RCVBUFERRORS, is_udplite); |
0d92efde DH |
675 | drop_reason = SKB_DROP_REASON_SOCKET_RCVBUFF; |
676 | } else { | |
a3ce2b10 MD |
677 | UDP6_INC_STATS(sock_net(sk), |
678 | UDP_MIB_MEMERRORS, is_udplite); | |
0d92efde DH |
679 | drop_reason = SKB_DROP_REASON_PROTO_MEM; |
680 | } | |
e61da9e2 | 681 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
0d92efde | 682 | kfree_skb_reason(skb, drop_reason); |
f7ad74fe BL |
683 | return -1; |
684 | } | |
850cbadd | 685 | |
f7ad74fe BL |
686 | return 0; |
687 | } | |
688 | ||
32bbd879 SB |
689 | static __inline__ int udpv6_err(struct sk_buff *skb, |
690 | struct inet6_skb_parm *opt, u8 type, | |
691 | u8 code, int offset, __be32 info) | |
ba4e58ec | 692 | { |
ba6aac15 KI |
693 | return __udp6_lib_err(skb, opt, type, code, offset, info, |
694 | dev_net(skb->dev)->ipv4.udp_table); | |
ba4e58ec GR |
695 | } |
696 | ||
cf329aa4 | 697 | static int udpv6_queue_rcv_one_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 698 | { |
0d92efde | 699 | enum skb_drop_reason drop_reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ba4e58ec | 700 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 701 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 702 | |
0d92efde DH |
703 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) { |
704 | drop_reason = SKB_DROP_REASON_XFRM_POLICY; | |
ba4e58ec | 705 | goto drop; |
0d92efde | 706 | } |
b0e214d2 | 707 | nf_reset_ct(skb); |
1da177e4 | 708 | |
88ab3108 | 709 | if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { |
d7f3f621 BL |
710 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
711 | ||
712 | /* | |
713 | * This is an encapsulation socket so pass the skb to | |
714 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
715 | * fall through and pass this up the UDP socket. | |
716 | * up->encap_rcv() returns the following value: | |
717 | * =0 if skb was successfully passed to the encap | |
718 | * handler or was discarded by it. | |
719 | * >0 if skb should be passed on to UDP. | |
720 | * <0 if skb should be resubmitted as proto -N | |
721 | */ | |
722 | ||
723 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 724 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 725 | if (encap_rcv) { |
d7f3f621 BL |
726 | int ret; |
727 | ||
0a80966b TH |
728 | /* Verify checksum before giving to encap */ |
729 | if (udp_lib_checksum_complete(skb)) | |
730 | goto csum_error; | |
731 | ||
d7f3f621 BL |
732 | ret = encap_rcv(sk, skb); |
733 | if (ret <= 0) { | |
250962e4 MD |
734 | __UDP6_INC_STATS(sock_net(sk), |
735 | UDP_MIB_INDATAGRAMS, | |
736 | is_udplite); | |
d7f3f621 BL |
737 | return -ret; |
738 | } | |
739 | } | |
740 | ||
741 | /* FALLTHROUGH -- it's a UDP Packet */ | |
742 | } | |
743 | ||
ba4e58ec GR |
744 | /* |
745 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
746 | */ | |
b0a42277 | 747 | if ((up->pcflag & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
748 | |
749 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
750 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
751 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
752 | goto drop; |
753 | } | |
754 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
755 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
756 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
757 | goto drop; |
758 | } | |
1da177e4 LT |
759 | } |
760 | ||
4b943fae | 761 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
762 | if (rcu_access_pointer(sk->sk_filter) && |
763 | udp_lib_checksum_complete(skb)) | |
764 | goto csum_error; | |
765 | ||
0d92efde DH |
766 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) { |
767 | drop_reason = SKB_DROP_REASON_SOCKET_FILTER; | |
a6127697 | 768 | goto drop; |
0d92efde | 769 | } |
ba4e58ec | 770 | |
e6afc8ac | 771 | udp_csum_pull_header(skb); |
cb80ef46 | 772 | |
d826eb14 | 773 | skb_dst_drop(skb); |
cb75994e | 774 | |
850cbadd | 775 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 776 | |
6a5dc9e5 | 777 | csum_error: |
0d92efde | 778 | drop_reason = SKB_DROP_REASON_UDP_CSUM; |
02c22347 | 779 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 780 | drop: |
02c22347 | 781 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 782 | atomic_inc(&sk->sk_drops); |
0d92efde | 783 | kfree_skb_reason(skb, drop_reason); |
ba4e58ec | 784 | return -1; |
1da177e4 LT |
785 | } |
786 | ||
cf329aa4 PA |
787 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
788 | { | |
789 | struct sk_buff *next, *segs; | |
790 | int ret; | |
791 | ||
792 | if (likely(!udp_unexpected_gso(sk, skb))) | |
793 | return udpv6_queue_rcv_one_skb(sk, skb); | |
794 | ||
795 | __skb_push(skb, -skb_mac_offset(skb)); | |
796 | segs = udp_rcv_segment(sk, skb, false); | |
1a186c14 | 797 | skb_list_walk_safe(segs, skb, next) { |
cf329aa4 PA |
798 | __skb_pull(skb, skb_transport_offset(skb)); |
799 | ||
000ac44d | 800 | udp_post_segment_fix_csum(skb); |
cf329aa4 PA |
801 | ret = udpv6_queue_rcv_one_skb(sk, skb); |
802 | if (ret > 0) | |
803 | ip6_protocol_deliver_rcu(dev_net(skb->dev), skb, ret, | |
804 | true); | |
805 | } | |
806 | return 0; | |
807 | } | |
808 | ||
dc3731ba | 809 | static bool __udp_v6_is_mcast_sock(struct net *net, const struct sock *sk, |
5cf3d461 DH |
810 | __be16 loc_port, const struct in6_addr *loc_addr, |
811 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
7bd2db40 | 812 | int dif, int sdif, unsigned short hnum) |
1da177e4 | 813 | { |
dc3731ba | 814 | const struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 815 | |
5cf3d461 DH |
816 | if (!net_eq(sock_net(sk), net)) |
817 | return false; | |
818 | ||
819 | if (udp_sk(sk)->udp_port_hash != hnum || | |
820 | sk->sk_family != PF_INET6 || | |
821 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
822 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
823 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
4c971d2f | 824 | !udp_sk_bound_dev_eq(net, READ_ONCE(sk->sk_bound_dev_if), dif, sdif) || |
33b4b015 HR |
825 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
826 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
827 | return false; |
828 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
829 | return false; | |
830 | return true; | |
1da177e4 LT |
831 | } |
832 | ||
4068579e TH |
833 | static void udp6_csum_zero_error(struct sk_buff *skb) |
834 | { | |
835 | /* RFC 2460 section 8.1 says that we SHOULD log | |
836 | * this error. Well, it is reasonable. | |
837 | */ | |
ba7a46f1 JP |
838 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
839 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
840 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
841 | } |
842 | ||
1da177e4 LT |
843 | /* |
844 | * Note: called only from the BH handler context, | |
845 | * so we don't need to lock the hashes. | |
846 | */ | |
e3163493 | 847 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 848 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 849 | struct udp_table *udptable, int proto) |
1da177e4 | 850 | { |
ca065d0c | 851 | struct sock *sk, *first = NULL; |
4bedb452 | 852 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
853 | unsigned short hnum = ntohs(uh->dest); |
854 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 855 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 856 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c | 857 | int dif = inet6_iif(skb); |
7bd2db40 | 858 | int sdif = inet6_sdif(skb); |
ca065d0c ED |
859 | struct hlist_node *node; |
860 | struct sk_buff *nskb; | |
2dc41cff DH |
861 | |
862 | if (use_hash2) { | |
f0b1e64c | 863 | hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & |
73e2d5e3 | 864 | udptable->mask; |
f0b1e64c | 865 | hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
2dc41cff | 866 | start_lookup: |
73e2d5e3 | 867 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
868 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
869 | } | |
1da177e4 | 870 | |
ca065d0c ED |
871 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
872 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
7bd2db40 DM |
873 | uh->source, saddr, dif, sdif, |
874 | hnum)) | |
ca065d0c ED |
875 | continue; |
876 | /* If zero checksum and no_check is not on for | |
877 | * the socket then skip it. | |
878 | */ | |
879 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
880 | continue; | |
881 | if (!first) { | |
882 | first = sk; | |
883 | continue; | |
884 | } | |
885 | nskb = skb_clone(skb, GFP_ATOMIC); | |
886 | if (unlikely(!nskb)) { | |
887 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
888 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
889 | IS_UDPLITE(sk)); | |
890 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
891 | IS_UDPLITE(sk)); | |
ca065d0c | 892 | continue; |
95766fff | 893 | } |
a1ab77f9 | 894 | |
ca065d0c ED |
895 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
896 | consume_skb(nskb); | |
897 | } | |
a1ab77f9 | 898 | |
2dc41cff DH |
899 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
900 | if (use_hash2 && hash2 != hash2_any) { | |
901 | hash2 = hash2_any; | |
902 | goto start_lookup; | |
903 | } | |
904 | ||
ca065d0c ED |
905 | if (first) { |
906 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
907 | consume_skb(skb); | |
a1ab77f9 | 908 | } else { |
ca065d0c | 909 | kfree_skb(skb); |
02c22347 ED |
910 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
911 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 912 | } |
ba4e58ec | 913 | return 0; |
1da177e4 LT |
914 | } |
915 | ||
64f0f5d1 PA |
916 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
917 | { | |
918 | if (udp_sk_rx_dst_set(sk, dst)) { | |
919 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
920 | ||
ef57c161 | 921 | sk->sk_rx_dst_cookie = rt6_get_cookie(rt); |
64f0f5d1 PA |
922 | } |
923 | } | |
924 | ||
eb63f296 PA |
925 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
926 | * return code conversion for ip layer consumption | |
927 | */ | |
928 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
929 | struct udphdr *uh) | |
930 | { | |
931 | int ret; | |
932 | ||
933 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
e4aa33ad | 934 | skb_checksum_try_convert(skb, IPPROTO_UDP, ip6_compute_pseudo); |
eb63f296 PA |
935 | |
936 | ret = udpv6_queue_rcv_skb(sk, skb); | |
937 | ||
84dad559 | 938 | /* a return value > 0 means to resubmit the input */ |
eb63f296 | 939 | if (ret > 0) |
84dad559 | 940 | return ret; |
eb63f296 PA |
941 | return 0; |
942 | } | |
943 | ||
645ca708 | 944 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 945 | int proto) |
1da177e4 | 946 | { |
4cf91f82 | 947 | enum skb_drop_reason reason = SKB_DROP_REASON_NOT_SPECIFIED; |
ca065d0c | 948 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 949 | struct net *net = dev_net(skb->dev); |
1ab1457c | 950 | struct udphdr *uh; |
ca065d0c | 951 | struct sock *sk; |
71489e21 | 952 | bool refcounted; |
1da177e4 LT |
953 | u32 ulen = 0; |
954 | ||
955 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 956 | goto discard; |
1da177e4 | 957 | |
0660e03f ACM |
958 | saddr = &ipv6_hdr(skb)->saddr; |
959 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 960 | uh = udp_hdr(skb); |
1da177e4 LT |
961 | |
962 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
963 | if (ulen > skb->len) |
964 | goto short_packet; | |
1da177e4 | 965 | |
759e5d00 HX |
966 | if (proto == IPPROTO_UDP) { |
967 | /* UDP validates ulen. */ | |
1da177e4 | 968 | |
ba4e58ec GR |
969 | /* Check for jumbo payload */ |
970 | if (ulen == 0) | |
971 | ulen = skb->len; | |
1da177e4 | 972 | |
ba4e58ec GR |
973 | if (ulen < sizeof(*uh)) |
974 | goto short_packet; | |
1da177e4 | 975 | |
ba4e58ec GR |
976 | if (ulen < skb->len) { |
977 | if (pskb_trim_rcsum(skb, ulen)) | |
978 | goto short_packet; | |
0660e03f ACM |
979 | saddr = &ipv6_hdr(skb)->saddr; |
980 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 981 | uh = udp_hdr(skb); |
ba4e58ec | 982 | } |
ba4e58ec | 983 | } |
1da177e4 | 984 | |
759e5d00 | 985 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 986 | goto csum_error; |
759e5d00 | 987 | |
c9f2c1ae | 988 | /* Check if the socket is already available, e.g. due to early demux */ |
71489e21 | 989 | sk = skb_steal_sock(skb, &refcounted); |
c9f2c1ae PA |
990 | if (sk) { |
991 | struct dst_entry *dst = skb_dst(skb); | |
992 | int ret; | |
993 | ||
8f905c0e | 994 | if (unlikely(rcu_dereference(sk->sk_rx_dst) != dst)) |
64f0f5d1 | 995 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae | 996 | |
eb63f296 | 997 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
71489e21 JS |
998 | if (refcounted) |
999 | sock_put(sk); | |
eb63f296 PA |
1000 | goto report_csum_error; |
1001 | } | |
c9f2c1ae | 1002 | |
eb63f296 | 1003 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
71489e21 JS |
1004 | if (refcounted) |
1005 | sock_put(sk); | |
eb63f296 | 1006 | return ret; |
c9f2c1ae PA |
1007 | } |
1008 | ||
1ab1457c YH |
1009 | /* |
1010 | * Multicast receive code | |
1da177e4 | 1011 | */ |
ba4e58ec | 1012 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 1013 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 1014 | saddr, daddr, udptable, proto); |
1da177e4 LT |
1015 | |
1016 | /* Unicast */ | |
607c4aaf | 1017 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 1018 | if (sk) { |
eb63f296 PA |
1019 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
1020 | goto report_csum_error; | |
1021 | return udp6_unicast_rcv_skb(sk, skb, uh); | |
1da177e4 | 1022 | } |
1ab1457c | 1023 | |
4cf91f82 DA |
1024 | reason = SKB_DROP_REASON_NO_SOCKET; |
1025 | ||
eb63f296 PA |
1026 | if (!uh->check) |
1027 | goto report_csum_error; | |
4068579e | 1028 | |
cb80ef46 | 1029 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 1030 | goto discard; |
b0e214d2 | 1031 | nf_reset_ct(skb); |
cb80ef46 BL |
1032 | |
1033 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 1034 | goto csum_error; |
cb80ef46 | 1035 | |
02c22347 | 1036 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
1037 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
1038 | ||
4cf91f82 | 1039 | kfree_skb_reason(skb, reason); |
add459aa | 1040 | return 0; |
1da177e4 | 1041 | |
1ab1457c | 1042 | short_packet: |
4cf91f82 DA |
1043 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1044 | reason = SKB_DROP_REASON_PKT_TOO_SMALL; | |
ba7a46f1 JP |
1045 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
1046 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
1047 | saddr, ntohs(uh->source), | |
1048 | ulen, skb->len, | |
1049 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 | 1050 | goto discard; |
eb63f296 PA |
1051 | |
1052 | report_csum_error: | |
1053 | udp6_csum_zero_error(skb); | |
6a5dc9e5 | 1054 | csum_error: |
4cf91f82 DA |
1055 | if (reason == SKB_DROP_REASON_NOT_SPECIFIED) |
1056 | reason = SKB_DROP_REASON_UDP_CSUM; | |
02c22347 | 1057 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 1058 | discard: |
02c22347 | 1059 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
4cf91f82 | 1060 | kfree_skb_reason(skb, reason); |
add459aa | 1061 | return 0; |
1da177e4 | 1062 | } |
ba4e58ec | 1063 | |
0bd84065 | 1064 | |
5425077d | 1065 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
1066 | __be16 loc_port, const struct in6_addr *loc_addr, | |
1067 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 1068 | int dif, int sdif) |
5425077d | 1069 | { |
ba6aac15 | 1070 | struct udp_table *udptable = net->ipv4.udp_table; |
0bd84065 | 1071 | unsigned short hnum = ntohs(loc_port); |
919dfa0b KI |
1072 | unsigned int hash2, slot2; |
1073 | struct udp_hslot *hslot2; | |
1074 | __portpair ports; | |
5425077d | 1075 | struct sock *sk; |
1076 | ||
919dfa0b | 1077 | hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
ba6aac15 KI |
1078 | slot2 = hash2 & udptable->mask; |
1079 | hslot2 = &udptable->hash2[slot2]; | |
919dfa0b KI |
1080 | ports = INET_COMBINED_PORTS(rmt_port, hnum); |
1081 | ||
0bd84065 | 1082 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 1083 | if (sk->sk_state == TCP_ESTABLISHED && |
5d368f03 | 1084 | inet6_match(net, sk, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 1085 | return sk; |
1086 | /* Only check first socket in chain */ | |
1087 | break; | |
1088 | } | |
1089 | return NULL; | |
5425077d | 1090 | } |
1091 | ||
11052589 | 1092 | void udp_v6_early_demux(struct sk_buff *skb) |
5425077d | 1093 | { |
1094 | struct net *net = dev_net(skb->dev); | |
1095 | const struct udphdr *uh; | |
1096 | struct sock *sk; | |
1097 | struct dst_entry *dst; | |
1098 | int dif = skb->dev->ifindex; | |
4297a0ef | 1099 | int sdif = inet6_sdif(skb); |
5425077d | 1100 | |
1101 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
1102 | sizeof(struct udphdr))) | |
1103 | return; | |
1104 | ||
1105 | uh = udp_hdr(skb); | |
1106 | ||
1107 | if (skb->pkt_type == PACKET_HOST) | |
1108 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
1109 | &ipv6_hdr(skb)->daddr, | |
1110 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 1111 | dif, sdif); |
5425077d | 1112 | else |
1113 | return; | |
1114 | ||
41c6d650 | 1115 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
5425077d | 1116 | return; |
1117 | ||
1118 | skb->sk = sk; | |
1119 | skb->destructor = sock_efree; | |
8f905c0e | 1120 | dst = rcu_dereference(sk->sk_rx_dst); |
5425077d | 1121 | |
1122 | if (dst) | |
ef57c161 | 1123 | dst = dst_check(dst, sk->sk_rx_dst_cookie); |
5425077d | 1124 | if (dst) { |
d24406c8 WW |
1125 | /* set noref for now. |
1126 | * any place which wants to hold dst has to call | |
1127 | * dst_hold_safe() | |
1128 | */ | |
1129 | skb_dst_set_noref(skb, dst); | |
5425077d | 1130 | } |
1131 | } | |
1132 | ||
0e219ae4 | 1133 | INDIRECT_CALLABLE_SCOPE int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 1134 | { |
ba6aac15 | 1135 | return __udp6_lib_rcv(skb, dev_net(skb->dev)->ipv4.udp_table, IPPROTO_UDP); |
ba4e58ec GR |
1136 | } |
1137 | ||
1da177e4 LT |
1138 | /* |
1139 | * Throw away all pending data and cancel the corking. Socket is locked. | |
1140 | */ | |
1141 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
1142 | { | |
1143 | struct udp_sock *up = udp_sk(sk); | |
1144 | ||
36d926b9 DL |
1145 | if (up->pending == AF_INET) |
1146 | udp_flush_pending_frames(sk); | |
1147 | else if (up->pending) { | |
1da177e4 LT |
1148 | up->len = 0; |
1149 | up->pending = 0; | |
1150 | ip6_flush_pending_frames(sk); | |
1ab1457c | 1151 | } |
1da177e4 LT |
1152 | } |
1153 | ||
d74bad4e AI |
1154 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
1155 | int addr_len) | |
1156 | { | |
bddc028a TH |
1157 | if (addr_len < offsetofend(struct sockaddr, sa_family)) |
1158 | return -EINVAL; | |
d74bad4e AI |
1159 | /* The following checks are replicated from __ip6_datagram_connect() |
1160 | * and intended to prevent BPF program called below from accessing | |
1161 | * bytes that are out of the bound specified by user in addr_len. | |
1162 | */ | |
1163 | if (uaddr->sa_family == AF_INET) { | |
89e9c728 | 1164 | if (ipv6_only_sock(sk)) |
d74bad4e AI |
1165 | return -EAFNOSUPPORT; |
1166 | return udp_pre_connect(sk, uaddr, addr_len); | |
1167 | } | |
1168 | ||
1169 | if (addr_len < SIN6_LEN_RFC2133) | |
1170 | return -EINVAL; | |
1171 | ||
1172 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); | |
1173 | } | |
1174 | ||
493c6be3 | 1175 | /** |
67ba4152 IM |
1176 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
1177 | * @sk: socket we are sending on | |
1178 | * @skb: sk_buff containing the filled-in UDP header | |
1179 | * (checksum field must be zeroed out) | |
b51cd7c8 AL |
1180 | * @saddr: source address |
1181 | * @daddr: destination address | |
1182 | * @len: length of packet | |
493c6be3 SS |
1183 | */ |
1184 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
1185 | const struct in6_addr *saddr, | |
1186 | const struct in6_addr *daddr, int len) | |
1187 | { | |
1188 | unsigned int offset; | |
1189 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1190 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1191 | __wsum csum = 0; |
1192 | ||
d39d938c | 1193 | if (!frags) { |
493c6be3 SS |
1194 | /* Only one fragment on the socket. */ |
1195 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1196 | skb->csum_offset = offsetof(struct udphdr, check); | |
1197 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1198 | } else { | |
1199 | /* | |
1200 | * HW-checksum won't work as there are two or more | |
1201 | * fragments on the socket so that all csums of sk_buffs | |
1202 | * should be together | |
1203 | */ | |
1204 | offset = skb_transport_offset(skb); | |
1205 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1206 | csum = skb->csum; |
493c6be3 SS |
1207 | |
1208 | skb->ip_summed = CHECKSUM_NONE; | |
1209 | ||
d39d938c VY |
1210 | do { |
1211 | csum = csum_add(csum, frags->csum); | |
1212 | } while ((frags = frags->next)); | |
493c6be3 SS |
1213 | |
1214 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1215 | csum); | |
1216 | if (uh->check == 0) | |
1217 | uh->check = CSUM_MANGLED_0; | |
1218 | } | |
1219 | } | |
1220 | ||
1da177e4 LT |
1221 | /* |
1222 | * Sending | |
1223 | */ | |
1224 | ||
bec1f6f6 WB |
1225 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1226 | struct inet_cork *cork) | |
1da177e4 | 1227 | { |
d39d938c | 1228 | struct sock *sk = skb->sk; |
1da177e4 | 1229 | struct udphdr *uh; |
1da177e4 | 1230 | int err = 0; |
b2bf1e26 | 1231 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1232 | __wsum csum = 0; |
d39d938c VY |
1233 | int offset = skb_transport_offset(skb); |
1234 | int len = skb->len - offset; | |
4094871d | 1235 | int datalen = len - sizeof(*uh); |
1da177e4 LT |
1236 | |
1237 | /* | |
1238 | * Create a UDP header | |
1239 | */ | |
4bedb452 | 1240 | uh = udp_hdr(skb); |
1958b856 DM |
1241 | uh->source = fl6->fl6_sport; |
1242 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1243 | uh->len = htons(len); |
1da177e4 LT |
1244 | uh->check = 0; |
1245 | ||
bec1f6f6 WB |
1246 | if (cork->gso_size) { |
1247 | const int hlen = skb_network_header_len(skb) + | |
1248 | sizeof(struct udphdr); | |
1249 | ||
0f149c9f WB |
1250 | if (hlen + cork->gso_size > cork->fragsize) { |
1251 | kfree_skb(skb); | |
bec1f6f6 | 1252 | return -EINVAL; |
0f149c9f | 1253 | } |
736ef37f | 1254 | if (datalen > cork->gso_size * UDP_MAX_SEGMENTS) { |
0f149c9f | 1255 | kfree_skb(skb); |
bec1f6f6 | 1256 | return -EINVAL; |
0f149c9f WB |
1257 | } |
1258 | if (udp_sk(sk)->no_check6_tx) { | |
1259 | kfree_skb(skb); | |
a8c744a8 | 1260 | return -EINVAL; |
0f149c9f | 1261 | } |
ff06342c | 1262 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || |
0f149c9f WB |
1263 | dst_xfrm(skb_dst(skb))) { |
1264 | kfree_skb(skb); | |
bec1f6f6 | 1265 | return -EIO; |
0f149c9f | 1266 | } |
bec1f6f6 | 1267 | |
4094871d JH |
1268 | if (datalen > cork->gso_size) { |
1269 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1270 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
1271 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(datalen, | |
1272 | cork->gso_size); | |
1273 | } | |
a8c744a8 | 1274 | goto csum_partial; |
bec1f6f6 WB |
1275 | } |
1276 | ||
b2bf1e26 | 1277 | if (is_udplite) |
d39d938c VY |
1278 | csum = udplite_csum(skb); |
1279 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1280 | skb->ip_summed = CHECKSUM_NONE; |
1281 | goto send; | |
1282 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
a8c744a8 | 1283 | csum_partial: |
d39d938c | 1284 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1285 | goto send; |
1286 | } else | |
d39d938c | 1287 | csum = udp_csum(skb); |
1da177e4 | 1288 | |
ba4e58ec | 1289 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1290 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1291 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1292 | if (uh->check == 0) |
f6ab0288 | 1293 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1294 | |
493c6be3 | 1295 | send: |
d39d938c | 1296 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1297 | if (err) { |
1298 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1299 | UDP6_INC_STATS(sock_net(sk), |
1300 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1301 | err = 0; |
1302 | } | |
6aef70a8 ED |
1303 | } else { |
1304 | UDP6_INC_STATS(sock_net(sk), | |
1305 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1306 | } | |
d39d938c VY |
1307 | return err; |
1308 | } | |
1309 | ||
1310 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1311 | { | |
1312 | struct sk_buff *skb; | |
1313 | struct udp_sock *up = udp_sk(sk); | |
d39d938c VY |
1314 | int err = 0; |
1315 | ||
1316 | if (up->pending == AF_INET) | |
1317 | return udp_push_pending_frames(sk); | |
1318 | ||
d39d938c VY |
1319 | skb = ip6_finish_skb(sk); |
1320 | if (!skb) | |
1321 | goto out; | |
1322 | ||
940ea00b PB |
1323 | err = udp_v6_send_skb(skb, &inet_sk(sk)->cork.fl.u.ip6, |
1324 | &inet_sk(sk)->cork.base); | |
1da177e4 LT |
1325 | out: |
1326 | up->len = 0; | |
1327 | up->pending = 0; | |
1328 | return err; | |
1329 | } | |
1330 | ||
1b784140 | 1331 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1332 | { |
1333 | struct ipv6_txoptions opt_space; | |
1334 | struct udp_sock *up = udp_sk(sk); | |
1335 | struct inet_sock *inet = inet_sk(sk); | |
1336 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1337 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1338 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1339 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1340 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1341 | struct ip6_flowlabel *flowlabel = NULL; |
5298953e PB |
1342 | struct inet_cork_full cork; |
1343 | struct flowi6 *fl6 = &cork.fl.u.ip6; | |
1da177e4 | 1344 | struct dst_entry *dst; |
26879da5 | 1345 | struct ipcm6_cookie ipc6; |
1da177e4 | 1346 | int addr_len = msg->msg_namelen; |
9f542f61 | 1347 | bool connected = false; |
1da177e4 | 1348 | int ulen = len; |
a9f59707 | 1349 | int corkreq = READ_ONCE(up->corkflag) || msg->msg_flags&MSG_MORE; |
1da177e4 | 1350 | int err; |
b2bf1e26 | 1351 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1352 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 | 1353 | |
b515430a | 1354 | ipcm6_init(&ipc6); |
18a419ba | 1355 | ipc6.gso_size = READ_ONCE(up->gso_size); |
5fdaa88d | 1356 | ipc6.sockc.tsflags = sk->sk_tsflags; |
c6af0c22 | 1357 | ipc6.sockc.mark = sk->sk_mark; |
26879da5 | 1358 | |
1da177e4 LT |
1359 | /* destination address check */ |
1360 | if (sin6) { | |
1361 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1362 | return -EINVAL; | |
1363 | ||
1364 | switch (sin6->sin6_family) { | |
1365 | case AF_INET6: | |
1366 | if (addr_len < SIN6_LEN_RFC2133) | |
1367 | return -EINVAL; | |
1368 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1369 | if (ipv6_addr_any(daddr) && |
1370 | ipv6_addr_v4mapped(&np->saddr)) | |
1371 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1372 | daddr); | |
1da177e4 LT |
1373 | break; |
1374 | case AF_INET: | |
1375 | goto do_udp_sendmsg; | |
1376 | case AF_UNSPEC: | |
1377 | msg->msg_name = sin6 = NULL; | |
1378 | msg->msg_namelen = addr_len = 0; | |
1379 | daddr = NULL; | |
1380 | break; | |
1381 | default: | |
1382 | return -EINVAL; | |
1383 | } | |
1384 | } else if (!up->pending) { | |
1385 | if (sk->sk_state != TCP_ESTABLISHED) | |
1386 | return -EDESTADDRREQ; | |
efe4208f | 1387 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1388 | } else |
1da177e4 LT |
1389 | daddr = NULL; |
1390 | ||
1391 | if (daddr) { | |
e773e4fa | 1392 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1393 | struct sockaddr_in sin; |
1394 | sin.sin_family = AF_INET; | |
c720c7e8 | 1395 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1396 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1397 | msg->msg_name = &sin; | |
1398 | msg->msg_namelen = sizeof(sin); | |
1399 | do_udp_sendmsg: | |
1c5950fc ED |
1400 | err = ipv6_only_sock(sk) ? |
1401 | -ENETUNREACH : udp_sendmsg(sk, msg, len); | |
1402 | msg->msg_name = sin6; | |
1403 | msg->msg_namelen = addr_len; | |
1404 | return err; | |
1da177e4 LT |
1405 | } |
1406 | } | |
1407 | ||
1da177e4 | 1408 | /* Rough check on arithmetic overflow, |
b59e139b | 1409 | better check is made in ip6_append_data(). |
1da177e4 LT |
1410 | */ |
1411 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1412 | return -EMSGSIZE; | |
1ab1457c | 1413 | |
03485f2a | 1414 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 | 1415 | if (up->pending) { |
406c4a0a PB |
1416 | if (up->pending == AF_INET) |
1417 | return udp_sendmsg(sk, msg, len); | |
1da177e4 LT |
1418 | /* |
1419 | * There are pending frames. | |
1420 | * The socket lock must be held while it's corked. | |
1421 | */ | |
1422 | lock_sock(sk); | |
1423 | if (likely(up->pending)) { | |
1424 | if (unlikely(up->pending != AF_INET6)) { | |
1425 | release_sock(sk); | |
1426 | return -EAFNOSUPPORT; | |
1427 | } | |
1428 | dst = NULL; | |
1429 | goto do_append_data; | |
1430 | } | |
1431 | release_sock(sk); | |
1432 | } | |
1433 | ulen += sizeof(struct udphdr); | |
1434 | ||
5298953e | 1435 | memset(fl6, 0, sizeof(*fl6)); |
1da177e4 LT |
1436 | |
1437 | if (sin6) { | |
1438 | if (sin6->sin6_port == 0) | |
1439 | return -EINVAL; | |
1440 | ||
5298953e | 1441 | fl6->fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1442 | daddr = &sin6->sin6_addr; |
1443 | ||
1444 | if (np->sndflow) { | |
5298953e PB |
1445 | fl6->flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1446 | if (fl6->flowlabel & IPV6_FLOWLABEL_MASK) { | |
1447 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1448 | if (IS_ERR(flowlabel)) |
1da177e4 | 1449 | return -EINVAL; |
1da177e4 LT |
1450 | } |
1451 | } | |
1452 | ||
1453 | /* | |
1454 | * Otherwise it will be difficult to maintain | |
1455 | * sk->sk_dst_cache. | |
1456 | */ | |
1457 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1458 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1459 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1460 | |
1461 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1462 | sin6->sin6_scope_id && | |
842df073 | 1463 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
5298953e | 1464 | fl6->flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1465 | } else { |
1466 | if (sk->sk_state != TCP_ESTABLISHED) | |
1467 | return -EDESTADDRREQ; | |
1468 | ||
5298953e | 1469 | fl6->fl6_dport = inet->inet_dport; |
efe4208f | 1470 | daddr = &sk->sk_v6_daddr; |
5298953e | 1471 | fl6->flowlabel = np->flow_label; |
9f542f61 | 1472 | connected = true; |
1da177e4 LT |
1473 | } |
1474 | ||
5298953e | 1475 | if (!fl6->flowi6_oif) |
4c971d2f | 1476 | fl6->flowi6_oif = READ_ONCE(sk->sk_bound_dev_if); |
1da177e4 | 1477 | |
5298953e PB |
1478 | if (!fl6->flowi6_oif) |
1479 | fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1480 | |
5298953e | 1481 | fl6->flowi6_uid = sk->sk_uid; |
51953d5b | 1482 | |
1da177e4 LT |
1483 | if (msg->msg_controllen) { |
1484 | opt = &opt_space; | |
1485 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1486 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1487 | ipc6.opt = opt; |
1da177e4 | 1488 | |
2e8de857 WB |
1489 | err = udp_cmsg_send(sk, msg, &ipc6.gso_size); |
1490 | if (err > 0) | |
5298953e | 1491 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, fl6, |
5fdaa88d | 1492 | &ipc6); |
1da177e4 LT |
1493 | if (err < 0) { |
1494 | fl6_sock_release(flowlabel); | |
1495 | return err; | |
1496 | } | |
5298953e PB |
1497 | if ((fl6->flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1498 | flowlabel = fl6_sock_lookup(sk, fl6->flowlabel); | |
59c820b2 | 1499 | if (IS_ERR(flowlabel)) |
1da177e4 LT |
1500 | return -EINVAL; |
1501 | } | |
1502 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1503 | opt = NULL; | |
9f542f61 | 1504 | connected = false; |
1da177e4 | 1505 | } |
45f6fad8 ED |
1506 | if (!opt) { |
1507 | opt = txopt_get(np); | |
1508 | opt_to_free = opt; | |
1509 | } | |
df9890c3 YH |
1510 | if (flowlabel) |
1511 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1512 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1513 | ipc6.opt = opt; |
1da177e4 | 1514 | |
5298953e PB |
1515 | fl6->flowi6_proto = sk->sk_protocol; |
1516 | fl6->flowi6_mark = ipc6.sockc.mark; | |
1517 | fl6->daddr = *daddr; | |
1518 | if (ipv6_addr_any(&fl6->saddr) && !ipv6_addr_any(&np->saddr)) | |
1519 | fl6->saddr = np->saddr; | |
1520 | fl6->fl6_sport = inet->inet_sport; | |
1ab1457c | 1521 | |
6fc88c35 | 1522 | if (cgroup_bpf_enabled(CGROUP_UDP6_SENDMSG) && !connected) { |
1cedee13 | 1523 | err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, |
5298953e PB |
1524 | (struct sockaddr *)sin6, |
1525 | &fl6->saddr); | |
1cedee13 AI |
1526 | if (err) |
1527 | goto out_no_dst; | |
1528 | if (sin6) { | |
1529 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { | |
1530 | /* BPF program rewrote IPv6-only by IPv4-mapped | |
1531 | * IPv6. It's currently unsupported. | |
1532 | */ | |
1533 | err = -ENOTSUPP; | |
1534 | goto out_no_dst; | |
1535 | } | |
1536 | if (sin6->sin6_port == 0) { | |
1537 | /* BPF program set invalid port. Reject it. */ | |
1538 | err = -EINVAL; | |
1539 | goto out_no_dst; | |
1540 | } | |
5298953e PB |
1541 | fl6->fl6_dport = sin6->sin6_port; |
1542 | fl6->daddr = sin6->sin6_addr; | |
1cedee13 AI |
1543 | } |
1544 | } | |
1545 | ||
5298953e PB |
1546 | if (ipv6_addr_any(&fl6->daddr)) |
1547 | fl6->daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
e8e36984 | 1548 | |
5298953e | 1549 | final_p = fl6_update_dst(fl6, opt, &final); |
20c59de2 | 1550 | if (final_p) |
9f542f61 | 1551 | connected = false; |
1da177e4 | 1552 | |
5298953e PB |
1553 | if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) { |
1554 | fl6->flowi6_oif = np->mcast_oif; | |
9f542f61 | 1555 | connected = false; |
5298953e PB |
1556 | } else if (!fl6->flowi6_oif) |
1557 | fl6->flowi6_oif = np->ucast_oif; | |
1da177e4 | 1558 | |
5298953e | 1559 | security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); |
beb8d13b | 1560 | |
38b7097b HFS |
1561 | if (ipc6.tclass < 0) |
1562 | ipc6.tclass = np->tclass; | |
1563 | ||
5298953e | 1564 | fl6->flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6->flowlabel); |
38b7097b | 1565 | |
5298953e | 1566 | dst = ip6_sk_dst_lookup_flow(sk, fl6, final_p, connected); |
68d0c6d3 DM |
1567 | if (IS_ERR(dst)) { |
1568 | err = PTR_ERR(dst); | |
1569 | dst = NULL; | |
1da177e4 | 1570 | goto out; |
14e50e57 | 1571 | } |
1da177e4 | 1572 | |
26879da5 | 1573 | if (ipc6.hlimit < 0) |
5298953e | 1574 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, fl6, dst); |
1da177e4 LT |
1575 | |
1576 | if (msg->msg_flags&MSG_CONFIRM) | |
1577 | goto do_confirm; | |
1578 | back_from_confirm: | |
1579 | ||
03485f2a VY |
1580 | /* Lockless fast path for the non-corking case */ |
1581 | if (!corkreq) { | |
1582 | struct sk_buff *skb; | |
1583 | ||
1584 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1585 | sizeof(struct udphdr), &ipc6, |
f37a4cc6 | 1586 | (struct rt6_info *)dst, |
5fdaa88d | 1587 | msg->msg_flags, &cork); |
03485f2a VY |
1588 | err = PTR_ERR(skb); |
1589 | if (!IS_ERR_OR_NULL(skb)) | |
5298953e | 1590 | err = udp_v6_send_skb(skb, fl6, &cork.base); |
40ac240c PB |
1591 | /* ip6_make_skb steals dst reference */ |
1592 | goto out_no_dst; | |
03485f2a VY |
1593 | } |
1594 | ||
1da177e4 LT |
1595 | lock_sock(sk); |
1596 | if (unlikely(up->pending)) { | |
1597 | /* The socket is already corked while preparing it. */ | |
1598 | /* ... which is an evident application bug. --ANK */ | |
1599 | release_sock(sk); | |
1600 | ||
ba7a46f1 | 1601 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1602 | err = -EINVAL; |
1603 | goto out; | |
1604 | } | |
1605 | ||
1606 | up->pending = AF_INET6; | |
1607 | ||
1608 | do_append_data: | |
26879da5 WW |
1609 | if (ipc6.dontfrag < 0) |
1610 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1611 | up->len += ulen; |
26879da5 | 1612 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
5298953e | 1613 | &ipc6, fl6, (struct rt6_info *)dst, |
5fdaa88d | 1614 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
1da177e4 LT |
1615 | if (err) |
1616 | udp_v6_flush_pending_frames(sk); | |
1617 | else if (!corkreq) | |
4c0a6cb0 | 1618 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1619 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1620 | up->pending = 0; | |
1da177e4 | 1621 | |
03485f2a VY |
1622 | if (err > 0) |
1623 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1624 | release_sock(sk); | |
1625 | ||
1da177e4 | 1626 | out: |
a3c96089 | 1627 | dst_release(dst); |
1cedee13 | 1628 | out_no_dst: |
1da177e4 | 1629 | fl6_sock_release(flowlabel); |
45f6fad8 | 1630 | txopt_put(opt_to_free); |
cd562c98 | 1631 | if (!err) |
1da177e4 | 1632 | return len; |
a18135eb DM |
1633 | /* |
1634 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1635 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1636 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1637 | * things). We could add another new stat but at least for now that | |
1638 | * seems like overkill. | |
1639 | */ | |
1640 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1641 | UDP6_INC_STATS(sock_net(sk), |
1642 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1643 | } |
1da177e4 LT |
1644 | return err; |
1645 | ||
1646 | do_confirm: | |
0dec879f | 1647 | if (msg->msg_flags & MSG_PROBE) |
5298953e | 1648 | dst_confirm_neigh(dst, &fl6->daddr); |
1da177e4 LT |
1649 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1650 | goto back_from_confirm; | |
1651 | err = 0; | |
1652 | goto out; | |
1653 | } | |
ed472b0c | 1654 | EXPORT_SYMBOL(udpv6_sendmsg); |
1da177e4 | 1655 | |
7d06b2e0 | 1656 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1657 | { |
44046a59 | 1658 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 1659 | lock_sock(sk); |
a8b897c7 PA |
1660 | |
1661 | /* protects from races with udp_abort() */ | |
1662 | sock_set_flag(sk, SOCK_DEAD); | |
1da177e4 LT |
1663 | udp_v6_flush_pending_frames(sk); |
1664 | release_sock(sk); | |
1665 | ||
60fb9567 PA |
1666 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { |
1667 | if (up->encap_type) { | |
1668 | void (*encap_destroy)(struct sock *sk); | |
1669 | encap_destroy = READ_ONCE(up->encap_destroy); | |
1670 | if (encap_destroy) | |
1671 | encap_destroy(sk); | |
1672 | } | |
a4a600dd | 1673 | if (up->encap_enabled) { |
9c480601 | 1674 | static_branch_dec(&udpv6_encap_needed_key); |
a4a600dd XL |
1675 | udp_encap_disable(); |
1676 | } | |
44046a59 | 1677 | } |
1da177e4 LT |
1678 | } |
1679 | ||
1680 | /* | |
1681 | * Socket option code for UDP | |
1682 | */ | |
a7b75c5a CH |
1683 | int udpv6_setsockopt(struct sock *sk, int level, int optname, sockptr_t optval, |
1684 | unsigned int optlen) | |
3fdadf7d | 1685 | { |
8a3854c7 | 1686 | if (level == SOL_UDP || level == SOL_UDPLITE || level == SOL_SOCKET) |
91ac1cca | 1687 | return udp_lib_setsockopt(sk, level, optname, |
a7b75c5a | 1688 | optval, optlen, |
4c0a6cb0 | 1689 | udp_v6_push_pending_frames); |
ba4e58ec | 1690 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1691 | } |
1692 | ||
ba4e58ec GR |
1693 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1694 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1695 | { |
db8dac20 | 1696 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1697 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1698 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1699 | } |
1700 | ||
11052589 | 1701 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1702 | .handler = udpv6_rcv, |
1703 | .err_handler = udpv6_err, | |
1704 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1705 | }; | |
1706 | ||
1707 | /* ------------------------------------------------------------------------ */ | |
1708 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1709 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1710 | { |
17ef66af LC |
1711 | if (v == SEQ_START_TOKEN) { |
1712 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1713 | } else { | |
1714 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
abc17a11 | 1715 | const struct inet_sock *inet = inet_sk((const struct sock *)v); |
17ef66af LC |
1716 | __u16 srcp = ntohs(inet->inet_sport); |
1717 | __u16 destp = ntohs(inet->inet_dport); | |
6c206b20 PA |
1718 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
1719 | udp_rqueue_get(v), bucket); | |
17ef66af | 1720 | } |
1da177e4 LT |
1721 | return 0; |
1722 | } | |
1723 | ||
c3506372 | 1724 | const struct seq_operations udp6_seq_ops = { |
a3d2599b CH |
1725 | .start = udp_seq_start, |
1726 | .next = udp_seq_next, | |
1727 | .stop = udp_seq_stop, | |
1728 | .show = udp6_seq_show, | |
1729 | }; | |
c3506372 | 1730 | EXPORT_SYMBOL(udp6_seq_ops); |
73cb88ec | 1731 | |
1da177e4 | 1732 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 | 1733 | .family = AF_INET6, |
478aee5d | 1734 | .udp_table = NULL, |
1da177e4 LT |
1735 | }; |
1736 | ||
2c8c1e72 | 1737 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1738 | { |
c3506372 CH |
1739 | if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, |
1740 | sizeof(struct udp_iter_state), &udp6_seq_afinfo)) | |
a3d2599b CH |
1741 | return -ENOMEM; |
1742 | return 0; | |
1da177e4 LT |
1743 | } |
1744 | ||
ec120da6 IM |
1745 | void udp6_proc_exit(struct net *net) |
1746 | { | |
a3d2599b | 1747 | remove_proc_entry("udp6", net->proc_net); |
1da177e4 LT |
1748 | } |
1749 | #endif /* CONFIG_PROC_FS */ | |
1750 | ||
1751 | /* ------------------------------------------------------------------------ */ | |
1752 | ||
1753 | struct proto udpv6_prot = { | |
1e802951 TZ |
1754 | .name = "UDPv6", |
1755 | .owner = THIS_MODULE, | |
1756 | .close = udp_lib_close, | |
d74bad4e | 1757 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1758 | .connect = ip6_datagram_connect, |
1759 | .disconnect = udp_disconnect, | |
1760 | .ioctl = udp_ioctl, | |
d38afeec | 1761 | .init = udpv6_init_sock, |
1e802951 TZ |
1762 | .destroy = udpv6_destroy_sock, |
1763 | .setsockopt = udpv6_setsockopt, | |
1764 | .getsockopt = udpv6_getsockopt, | |
1765 | .sendmsg = udpv6_sendmsg, | |
1766 | .recvmsg = udpv6_recvmsg, | |
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), | |
67fb4330 | 1784 | .h.udp_table = NULL, |
1e802951 | 1785 | .diag_destroy = udp_abort, |
1da177e4 LT |
1786 | }; |
1787 | ||
1da177e4 LT |
1788 | static struct inet_protosw udpv6_protosw = { |
1789 | .type = SOCK_DGRAM, | |
1790 | .protocol = IPPROTO_UDP, | |
1791 | .prot = &udpv6_prot, | |
1792 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1793 | .flags = INET_PROTOSW_PERMANENT, |
1794 | }; | |
1795 | ||
7f4e4868 | 1796 | int __init udpv6_init(void) |
1da177e4 | 1797 | { |
7f4e4868 DL |
1798 | int ret; |
1799 | ||
3336288a VY |
1800 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1801 | if (ret) | |
c6b641a4 | 1802 | goto out; |
3336288a | 1803 | |
7f4e4868 DL |
1804 | ret = inet6_register_protosw(&udpv6_protosw); |
1805 | if (ret) | |
1806 | goto out_udpv6_protocol; | |
1807 | out: | |
1808 | return ret; | |
1809 | ||
1810 | out_udpv6_protocol: | |
1811 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1812 | goto out; | |
1813 | } | |
1814 | ||
09f7709f | 1815 | void udpv6_exit(void) |
7f4e4868 DL |
1816 | { |
1817 | inet6_unregister_protosw(&udpv6_protosw); | |
1818 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1819 | } |