Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | |
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
0bd84065 | 49 | #include <net/inet_hashtables.h> |
72289b96 | 50 | #include <net/inet6_hashtables.h> |
076bb0c8 | 51 | #include <net/busy_poll.h> |
e32ea7e7 | 52 | #include <net/sock_reuseport.h> |
1da177e4 LT |
53 | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/seq_file.h> | |
22911fc5 | 56 | #include <trace/events/skb.h> |
ba4e58ec | 57 | #include "udp_impl.h" |
1da177e4 | 58 | |
63a6fff3 RS |
59 | static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) |
60 | { | |
61 | #if defined(CONFIG_NET_L3_MASTER_DEV) | |
62 | if (!net->ipv4.sysctl_udp_l3mdev_accept && | |
63 | skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) | |
64 | return true; | |
65 | #endif | |
66 | return false; | |
67 | } | |
68 | ||
6eada011 ED |
69 | static u32 udp6_ehashfn(const struct net *net, |
70 | const struct in6_addr *laddr, | |
71 | const u16 lport, | |
72 | const struct in6_addr *faddr, | |
73 | const __be16 fport) | |
b50026b5 | 74 | { |
1bbdceef HFS |
75 | static u32 udp6_ehash_secret __read_mostly; |
76 | static u32 udp_ipv6_hash_secret __read_mostly; | |
77 | ||
78 | u32 lhash, fhash; | |
79 | ||
80 | net_get_random_once(&udp6_ehash_secret, | |
81 | sizeof(udp6_ehash_secret)); | |
82 | net_get_random_once(&udp_ipv6_hash_secret, | |
83 | sizeof(udp_ipv6_hash_secret)); | |
84 | ||
85 | lhash = (__force u32)laddr->s6_addr32[3]; | |
86 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
87 | ||
b50026b5 | 88 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 89 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
90 | } |
91 | ||
6ba5a3c5 | 92 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 93 | { |
30fff923 | 94 | unsigned int hash2_nulladdr = |
f0b1e64c | 95 | ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
9a52e97e | 96 | unsigned int hash2_partial = |
f0b1e64c | 97 | ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 98 | |
d4cada4a | 99 | /* precompute partial secondary hash */ |
30fff923 | 100 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 101 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
1da177e4 LT |
102 | } |
103 | ||
719f8358 ED |
104 | static void udp_v6_rehash(struct sock *sk) |
105 | { | |
f0b1e64c | 106 | u16 new_hash = ipv6_portaddr_hash(sock_net(sk), |
efe4208f | 107 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
108 | inet_sk(sk)->inet_num); |
109 | ||
110 | udp_lib_rehash(sk, new_hash); | |
111 | } | |
112 | ||
d1e37288 SX |
113 | static int compute_score(struct sock *sk, struct net *net, |
114 | const struct in6_addr *saddr, __be16 sport, | |
115 | const struct in6_addr *daddr, unsigned short hnum, | |
1801b570 | 116 | int dif, int sdif, bool exact_dif) |
645ca708 | 117 | { |
60c04aec JP |
118 | int score; |
119 | struct inet_sock *inet; | |
6da5b0f0 | 120 | bool dev_match; |
60c04aec JP |
121 | |
122 | if (!net_eq(sock_net(sk), net) || | |
123 | udp_sk(sk)->udp_port_hash != hnum || | |
124 | sk->sk_family != PF_INET6) | |
125 | return -1; | |
126 | ||
127 | score = 0; | |
128 | inet = inet_sk(sk); | |
129 | ||
130 | if (inet->inet_dport) { | |
131 | if (inet->inet_dport != sport) | |
132 | return -1; | |
133 | score++; | |
134 | } | |
135 | ||
136 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
137 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
138 | return -1; | |
139 | score++; | |
140 | } | |
141 | ||
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 | ||
6da5b0f0 MM |
148 | dev_match = udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif); |
149 | if (!dev_match) | |
150 | return -1; | |
151 | score++; | |
60c04aec | 152 | |
70da268b ED |
153 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
154 | score++; | |
155 | ||
645ca708 ED |
156 | return score; |
157 | } | |
158 | ||
d1e37288 | 159 | /* called with rcu_read_lock() */ |
fddc17de ED |
160 | static struct sock *udp6_lib_lookup2(struct net *net, |
161 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 DA |
162 | const struct in6_addr *daddr, unsigned int hnum, |
163 | int dif, int sdif, bool exact_dif, | |
164 | struct udp_hslot *hslot2, struct sk_buff *skb) | |
fddc17de ED |
165 | { |
166 | struct sock *sk, *result; | |
e94a62f5 | 167 | int score, badness; |
72289b96 | 168 | u32 hash = 0; |
fddc17de | 169 | |
fddc17de ED |
170 | result = NULL; |
171 | badness = -1; | |
ca065d0c | 172 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 173 | score = compute_score(sk, net, saddr, sport, |
1801b570 | 174 | daddr, hnum, dif, sdif, exact_dif); |
fddc17de | 175 | if (score > badness) { |
e94a62f5 | 176 | if (sk->sk_reuseport) { |
b50026b5 HFS |
177 | hash = udp6_ehashfn(net, daddr, hnum, |
178 | saddr, sport); | |
ed0dfffd | 179 | |
ca065d0c | 180 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 181 | sizeof(struct udphdr)); |
ca065d0c ED |
182 | if (result) |
183 | return result; | |
70da268b | 184 | } |
ca065d0c ED |
185 | result = sk; |
186 | badness = score; | |
fddc17de ED |
187 | } |
188 | } | |
fddc17de ED |
189 | return result; |
190 | } | |
191 | ||
ca065d0c | 192 | /* rcu_read_lock() must be held */ |
fce82338 | 193 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
194 | const struct in6_addr *saddr, __be16 sport, |
195 | const struct in6_addr *daddr, __be16 dport, | |
196 | int dif, int sdif, struct udp_table *udptable, | |
197 | struct sk_buff *skb) | |
1da177e4 | 198 | { |
271b72c7 | 199 | struct sock *sk, *result; |
1da177e4 | 200 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
201 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
202 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
63a6fff3 | 203 | bool exact_dif = udp6_lib_exact_dif_match(net, skb); |
e94a62f5 | 204 | int score, badness; |
72289b96 | 205 | u32 hash = 0; |
645ca708 | 206 | |
fddc17de | 207 | if (hslot->count > 10) { |
f0b1e64c | 208 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
fddc17de ED |
209 | slot2 = hash2 & udptable->mask; |
210 | hslot2 = &udptable->hash2[slot2]; | |
211 | if (hslot->count < hslot2->count) | |
212 | goto begin; | |
213 | ||
214 | result = udp6_lib_lookup2(net, saddr, sport, | |
1801b570 | 215 | daddr, hnum, dif, sdif, exact_dif, |
d1e37288 | 216 | hslot2, skb); |
fddc17de | 217 | if (!result) { |
d1e37288 | 218 | unsigned int old_slot2 = slot2; |
f0b1e64c | 219 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); |
fddc17de | 220 | slot2 = hash2 & udptable->mask; |
d1e37288 SX |
221 | /* avoid searching the same slot again. */ |
222 | if (unlikely(slot2 == old_slot2)) | |
223 | return result; | |
224 | ||
fddc17de ED |
225 | hslot2 = &udptable->hash2[slot2]; |
226 | if (hslot->count < hslot2->count) | |
227 | goto begin; | |
228 | ||
1223c67c | 229 | result = udp6_lib_lookup2(net, saddr, sport, |
1801b570 | 230 | daddr, hnum, dif, sdif, |
63a6fff3 RS |
231 | exact_dif, hslot2, |
232 | skb); | |
fddc17de | 233 | } |
8217ca65 MKL |
234 | if (unlikely(IS_ERR(result))) |
235 | return NULL; | |
fddc17de ED |
236 | return result; |
237 | } | |
271b72c7 ED |
238 | begin: |
239 | result = NULL; | |
240 | badness = -1; | |
ca065d0c | 241 | sk_for_each_rcu(sk, &hslot->head) { |
63a6fff3 | 242 | score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, |
1801b570 | 243 | sdif, exact_dif); |
645ca708 | 244 | if (score > badness) { |
e94a62f5 | 245 | if (sk->sk_reuseport) { |
b50026b5 HFS |
246 | hash = udp6_ehashfn(net, daddr, hnum, |
247 | saddr, sport); | |
ca065d0c | 248 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 249 | sizeof(struct udphdr)); |
8217ca65 MKL |
250 | if (unlikely(IS_ERR(result))) |
251 | return NULL; | |
ca065d0c ED |
252 | if (result) |
253 | return result; | |
72289b96 | 254 | } |
ca065d0c ED |
255 | result = sk; |
256 | badness = score; | |
1da177e4 LT |
257 | } |
258 | } | |
1da177e4 LT |
259 | return result; |
260 | } | |
fce82338 | 261 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 262 | |
607c4aaf KK |
263 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
264 | __be16 sport, __be16 dport, | |
645ca708 | 265 | struct udp_table *udptable) |
607c4aaf | 266 | { |
b71d1d42 | 267 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 268 | |
ed7cbbce | 269 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 270 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 271 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
272 | } |
273 | ||
63058308 TH |
274 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
275 | __be16 sport, __be16 dport) | |
276 | { | |
277 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
63058308 | 278 | |
ed7cbbce | 279 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
63058308 | 280 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 281 | inet6_sdif(skb), &udp_table, skb); |
63058308 TH |
282 | } |
283 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); | |
284 | ||
ca065d0c ED |
285 | /* Must be called under rcu_read_lock(). |
286 | * Does increment socket refcount. | |
287 | */ | |
6e86000c | 288 | #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) |
aa976fc0 BS |
289 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
290 | const struct in6_addr *daddr, __be16 dport, int dif) | |
291 | { | |
ca065d0c ED |
292 | struct sock *sk; |
293 | ||
294 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
1801b570 | 295 | dif, 0, &udp_table, NULL); |
41c6d650 | 296 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
297 | sk = NULL; |
298 | return sk; | |
aa976fc0 BS |
299 | } |
300 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 301 | #endif |
aa976fc0 | 302 | |
cb891fa6 PA |
303 | /* do not use the scratch area len for jumbogram: their length execeeds the |
304 | * scratch area space; note that the IP6CB flags is still in the first | |
305 | * cacheline, so checking for jumbograms is cheap | |
306 | */ | |
307 | static int udp6_skb_len(struct sk_buff *skb) | |
308 | { | |
309 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); | |
310 | } | |
311 | ||
1da177e4 | 312 | /* |
67ba4152 IM |
313 | * This should be easy, if there is something there we |
314 | * return it, otherwise we block. | |
1da177e4 LT |
315 | */ |
316 | ||
1b784140 | 317 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
318 | int noblock, int flags, int *addr_len) |
319 | { | |
320 | struct ipv6_pinfo *np = inet6_sk(sk); | |
321 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 322 | struct sk_buff *skb; |
59c2cdae | 323 | unsigned int ulen, copied; |
627d2d6b | 324 | int peeked, peeking, off; |
759e5d00 HX |
325 | int err; |
326 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 327 | bool checksum_valid = false; |
f26ba175 | 328 | int is_udp4; |
1da177e4 | 329 | |
1da177e4 | 330 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 331 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 332 | |
4b340ae2 | 333 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 334 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 335 | |
1da177e4 | 336 | try_again: |
a0917e0b MD |
337 | peeking = flags & MSG_PEEK; |
338 | off = sk_peek_offset(sk, flags); | |
7c13f97f | 339 | skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); |
1da177e4 | 340 | if (!skb) |
627d2d6b | 341 | return err; |
1da177e4 | 342 | |
cb891fa6 | 343 | ulen = udp6_skb_len(skb); |
59c2cdae | 344 | copied = len; |
627d2d6b | 345 | if (copied > ulen - off) |
346 | copied = ulen - off; | |
59c2cdae | 347 | else if (copied < ulen) |
1ab1457c | 348 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 349 | |
f26ba175 WY |
350 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
351 | ||
ba4e58ec | 352 | /* |
759e5d00 HX |
353 | * If checksum is needed at all, try to do it while copying the |
354 | * data. If the data is truncated, or if we only want a partial | |
355 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 356 | */ |
ba4e58ec | 357 | |
d21dbdfe ED |
358 | if (copied < ulen || peeking || |
359 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
67a51780 PA |
360 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
361 | !__udp_lib_checksum_complete(skb); | |
197c949e | 362 | if (!checksum_valid) |
1da177e4 | 363 | goto csum_copy_err; |
ba4e58ec GR |
364 | } |
365 | ||
67a51780 PA |
366 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
367 | if (udp_skb_is_linear(skb)) | |
368 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
369 | else | |
370 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
371 | } else { | |
627d2d6b | 372 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
373 | if (err == -EINVAL) |
374 | goto csum_copy_err; | |
375 | } | |
22911fc5 | 376 | if (unlikely(err)) { |
979402b1 ED |
377 | if (!peeked) { |
378 | atomic_inc(&sk->sk_drops); | |
379 | if (is_udp4) | |
6aef70a8 ED |
380 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
381 | is_udplite); | |
979402b1 | 382 | else |
6aef70a8 ED |
383 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
384 | is_udplite); | |
979402b1 | 385 | } |
850cbadd | 386 | kfree_skb(skb); |
627d2d6b | 387 | return err; |
22911fc5 | 388 | } |
f26ba175 WY |
389 | if (!peeked) { |
390 | if (is_udp4) | |
6aef70a8 ED |
391 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
392 | is_udplite); | |
f26ba175 | 393 | else |
6aef70a8 ED |
394 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
395 | is_udplite); | |
f26ba175 | 396 | } |
cb75994e | 397 | |
3b885787 | 398 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
399 | |
400 | /* Copy the address. */ | |
401 | if (msg->msg_name) { | |
342dfc30 | 402 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 403 | sin6->sin6_family = AF_INET6; |
4bedb452 | 404 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 405 | sin6->sin6_flowinfo = 0; |
1da177e4 | 406 | |
842df073 | 407 | if (is_udp4) { |
b301e82c BH |
408 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
409 | &sin6->sin6_addr); | |
842df073 HFS |
410 | sin6->sin6_scope_id = 0; |
411 | } else { | |
4e3fd7a0 | 412 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
413 | sin6->sin6_scope_id = |
414 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 415 | inet6_iif(skb)); |
1da177e4 | 416 | } |
bceaa902 | 417 | *addr_len = sizeof(*sin6); |
1da177e4 | 418 | } |
4b261c75 | 419 | |
bcd1665e PA |
420 | if (udp_sk(sk)->gro_enabled) |
421 | udp_cmsg_recv(msg, sk, skb); | |
422 | ||
4b261c75 HFS |
423 | if (np->rxopt.all) |
424 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
425 | ||
f26ba175 | 426 | if (is_udp4) { |
1da177e4 | 427 | if (inet->cmsg_flags) |
ad959036 | 428 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 429 | sizeof(struct udphdr), off); |
1da177e4 LT |
430 | } else { |
431 | if (np->rxopt.all) | |
4b261c75 | 432 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 433 | } |
1da177e4 | 434 | |
59c2cdae | 435 | err = copied; |
1da177e4 | 436 | if (flags & MSG_TRUNC) |
759e5d00 | 437 | err = ulen; |
1da177e4 | 438 | |
850cbadd | 439 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
440 | return err; |
441 | ||
442 | csum_copy_err: | |
2276f58a PA |
443 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
444 | udp_skb_destructor)) { | |
6a5dc9e5 | 445 | if (is_udp4) { |
6aef70a8 ED |
446 | UDP_INC_STATS(sock_net(sk), |
447 | UDP_MIB_CSUMERRORS, is_udplite); | |
448 | UDP_INC_STATS(sock_net(sk), | |
449 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 450 | } else { |
6aef70a8 ED |
451 | UDP6_INC_STATS(sock_net(sk), |
452 | UDP_MIB_CSUMERRORS, is_udplite); | |
453 | UDP6_INC_STATS(sock_net(sk), | |
454 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 455 | } |
0856f939 | 456 | } |
850cbadd | 457 | kfree_skb(skb); |
1da177e4 | 458 | |
beb39db5 ED |
459 | /* starting over for a new packet, but check if we need to yield */ |
460 | cond_resched(); | |
9cfaa8de | 461 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
462 | goto try_again; |
463 | } | |
464 | ||
ba4e58ec | 465 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 466 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 467 | struct udp_table *udptable) |
1da177e4 LT |
468 | { |
469 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
470 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
471 | const struct in6_addr *saddr = &hdr->saddr; | |
472 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 473 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 474 | struct sock *sk; |
e0d8c1b7 | 475 | int harderr; |
1da177e4 | 476 | int err; |
7304fe46 | 477 | struct net *net = dev_net(skb->dev); |
1da177e4 | 478 | |
e32ea7e7 | 479 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
f64bf6b8 | 480 | inet6_iif(skb), inet6_sdif(skb), udptable, skb); |
63159f29 | 481 | if (!sk) { |
a16292a0 ED |
482 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
483 | ICMP6_MIB_INERRORS); | |
1da177e4 | 484 | return; |
7304fe46 | 485 | } |
1da177e4 | 486 | |
e0d8c1b7 WW |
487 | harderr = icmpv6_err_convert(type, code, &err); |
488 | np = inet6_sk(sk); | |
489 | ||
93b36cf3 HFS |
490 | if (type == ICMPV6_PKT_TOOBIG) { |
491 | if (!ip6_sk_accept_pmtu(sk)) | |
492 | goto out; | |
81aded24 | 493 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
494 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
495 | harderr = 1; | |
93b36cf3 | 496 | } |
1a462d18 | 497 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 498 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
499 | goto out; |
500 | } | |
81aded24 | 501 | |
e0d8c1b7 WW |
502 | if (!np->recverr) { |
503 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
504 | goto out; | |
505 | } else { | |
1da177e4 | 506 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 507 | } |
b1faf566 | 508 | |
1da177e4 LT |
509 | sk->sk_err = err; |
510 | sk->sk_error_report(sk); | |
511 | out: | |
ca065d0c | 512 | return; |
1da177e4 LT |
513 | } |
514 | ||
a3f96c47 | 515 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
516 | { |
517 | int rc; | |
518 | ||
efe4208f | 519 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 520 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 521 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 522 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
523 | } else { |
524 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 525 | } |
f7ad74fe | 526 | |
850cbadd | 527 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
528 | if (rc < 0) { |
529 | int is_udplite = IS_UDPLITE(sk); | |
530 | ||
531 | /* Note that an ENOMEM error is charged twice */ | |
532 | if (rc == -ENOMEM) | |
e61da9e2 | 533 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 534 | UDP_MIB_RCVBUFERRORS, is_udplite); |
e61da9e2 | 535 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
f7ad74fe BL |
536 | kfree_skb(skb); |
537 | return -1; | |
538 | } | |
850cbadd | 539 | |
f7ad74fe BL |
540 | return 0; |
541 | } | |
542 | ||
ba4e58ec | 543 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 544 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 545 | u8 code, int offset, __be32 info) |
ba4e58ec | 546 | { |
645ca708 | 547 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
548 | } |
549 | ||
f2e9de21 | 550 | DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
d7f3f621 BL |
551 | void udpv6_encap_enable(void) |
552 | { | |
88ab3108 | 553 | static_branch_enable(&udpv6_encap_needed_key); |
d7f3f621 BL |
554 | } |
555 | EXPORT_SYMBOL(udpv6_encap_enable); | |
556 | ||
a3f96c47 | 557 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 558 | { |
ba4e58ec | 559 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 560 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 561 | |
ba4e58ec GR |
562 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
563 | goto drop; | |
1da177e4 | 564 | |
88ab3108 | 565 | if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { |
d7f3f621 BL |
566 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
567 | ||
568 | /* | |
569 | * This is an encapsulation socket so pass the skb to | |
570 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
571 | * fall through and pass this up the UDP socket. | |
572 | * up->encap_rcv() returns the following value: | |
573 | * =0 if skb was successfully passed to the encap | |
574 | * handler or was discarded by it. | |
575 | * >0 if skb should be passed on to UDP. | |
576 | * <0 if skb should be resubmitted as proto -N | |
577 | */ | |
578 | ||
579 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 580 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 581 | if (encap_rcv) { |
d7f3f621 BL |
582 | int ret; |
583 | ||
0a80966b TH |
584 | /* Verify checksum before giving to encap */ |
585 | if (udp_lib_checksum_complete(skb)) | |
586 | goto csum_error; | |
587 | ||
d7f3f621 BL |
588 | ret = encap_rcv(sk, skb); |
589 | if (ret <= 0) { | |
02c22347 ED |
590 | __UDP_INC_STATS(sock_net(sk), |
591 | UDP_MIB_INDATAGRAMS, | |
592 | is_udplite); | |
d7f3f621 BL |
593 | return -ret; |
594 | } | |
595 | } | |
596 | ||
597 | /* FALLTHROUGH -- it's a UDP Packet */ | |
598 | } | |
599 | ||
ba4e58ec GR |
600 | /* |
601 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
602 | */ | |
b2bf1e26 | 603 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
604 | |
605 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
606 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
607 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
608 | goto drop; |
609 | } | |
610 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
611 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
612 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
613 | goto drop; |
614 | } | |
1da177e4 LT |
615 | } |
616 | ||
4b943fae | 617 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
618 | if (rcu_access_pointer(sk->sk_filter) && |
619 | udp_lib_checksum_complete(skb)) | |
620 | goto csum_error; | |
621 | ||
ba66bbe5 | 622 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
a6127697 | 623 | goto drop; |
ba4e58ec | 624 | |
e6afc8ac | 625 | udp_csum_pull_header(skb); |
cb80ef46 | 626 | |
d826eb14 | 627 | skb_dst_drop(skb); |
cb75994e | 628 | |
850cbadd | 629 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 630 | |
6a5dc9e5 | 631 | csum_error: |
02c22347 | 632 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 633 | drop: |
02c22347 | 634 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 635 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
636 | kfree_skb(skb); |
637 | return -1; | |
1da177e4 LT |
638 | } |
639 | ||
5cf3d461 DH |
640 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
641 | __be16 loc_port, const struct in6_addr *loc_addr, | |
642 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
7bd2db40 | 643 | int dif, int sdif, unsigned short hnum) |
1da177e4 | 644 | { |
5cf3d461 | 645 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 646 | |
5cf3d461 DH |
647 | if (!net_eq(sock_net(sk), net)) |
648 | return false; | |
649 | ||
650 | if (udp_sk(sk)->udp_port_hash != hnum || | |
651 | sk->sk_family != PF_INET6 || | |
652 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
653 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
654 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
7bd2db40 | 655 | !udp_sk_bound_dev_eq(net, sk->sk_bound_dev_if, dif, sdif) || |
33b4b015 HR |
656 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && |
657 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
658 | return false; |
659 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
660 | return false; | |
661 | return true; | |
1da177e4 LT |
662 | } |
663 | ||
4068579e TH |
664 | static void udp6_csum_zero_error(struct sk_buff *skb) |
665 | { | |
666 | /* RFC 2460 section 8.1 says that we SHOULD log | |
667 | * this error. Well, it is reasonable. | |
668 | */ | |
ba7a46f1 JP |
669 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
670 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
671 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
672 | } |
673 | ||
1da177e4 LT |
674 | /* |
675 | * Note: called only from the BH handler context, | |
676 | * so we don't need to lock the hashes. | |
677 | */ | |
e3163493 | 678 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 679 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 680 | struct udp_table *udptable, int proto) |
1da177e4 | 681 | { |
ca065d0c | 682 | struct sock *sk, *first = NULL; |
4bedb452 | 683 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
684 | unsigned short hnum = ntohs(uh->dest); |
685 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 686 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 687 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c | 688 | int dif = inet6_iif(skb); |
7bd2db40 | 689 | int sdif = inet6_sdif(skb); |
ca065d0c ED |
690 | struct hlist_node *node; |
691 | struct sk_buff *nskb; | |
2dc41cff DH |
692 | |
693 | if (use_hash2) { | |
f0b1e64c | 694 | hash2_any = ipv6_portaddr_hash(net, &in6addr_any, hnum) & |
73e2d5e3 | 695 | udptable->mask; |
f0b1e64c | 696 | hash2 = ipv6_portaddr_hash(net, daddr, hnum) & udptable->mask; |
2dc41cff | 697 | start_lookup: |
73e2d5e3 | 698 | hslot = &udptable->hash2[hash2]; |
2dc41cff DH |
699 | offset = offsetof(typeof(*sk), __sk_common.skc_portaddr_node); |
700 | } | |
1da177e4 | 701 | |
ca065d0c ED |
702 | sk_for_each_entry_offset_rcu(sk, node, &hslot->head, offset) { |
703 | if (!__udp_v6_is_mcast_sock(net, sk, uh->dest, daddr, | |
7bd2db40 DM |
704 | uh->source, saddr, dif, sdif, |
705 | hnum)) | |
ca065d0c ED |
706 | continue; |
707 | /* If zero checksum and no_check is not on for | |
708 | * the socket then skip it. | |
709 | */ | |
710 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
711 | continue; | |
712 | if (!first) { | |
713 | first = sk; | |
714 | continue; | |
715 | } | |
716 | nskb = skb_clone(skb, GFP_ATOMIC); | |
717 | if (unlikely(!nskb)) { | |
718 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
719 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
720 | IS_UDPLITE(sk)); | |
721 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
722 | IS_UDPLITE(sk)); | |
ca065d0c | 723 | continue; |
95766fff | 724 | } |
a1ab77f9 | 725 | |
ca065d0c ED |
726 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
727 | consume_skb(nskb); | |
728 | } | |
a1ab77f9 | 729 | |
2dc41cff DH |
730 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
731 | if (use_hash2 && hash2 != hash2_any) { | |
732 | hash2 = hash2_any; | |
733 | goto start_lookup; | |
734 | } | |
735 | ||
ca065d0c ED |
736 | if (first) { |
737 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
738 | consume_skb(skb); | |
a1ab77f9 | 739 | } else { |
ca065d0c | 740 | kfree_skb(skb); |
02c22347 ED |
741 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
742 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 743 | } |
ba4e58ec | 744 | return 0; |
1da177e4 LT |
745 | } |
746 | ||
64f0f5d1 PA |
747 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
748 | { | |
749 | if (udp_sk_rx_dst_set(sk, dst)) { | |
750 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
751 | ||
752 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); | |
753 | } | |
754 | } | |
755 | ||
eb63f296 PA |
756 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
757 | * return code conversion for ip layer consumption | |
758 | */ | |
759 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
760 | struct udphdr *uh) | |
761 | { | |
762 | int ret; | |
763 | ||
764 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
765 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, | |
766 | ip6_compute_pseudo); | |
767 | ||
768 | ret = udpv6_queue_rcv_skb(sk, skb); | |
769 | ||
84dad559 | 770 | /* a return value > 0 means to resubmit the input */ |
eb63f296 | 771 | if (ret > 0) |
84dad559 | 772 | return ret; |
eb63f296 PA |
773 | return 0; |
774 | } | |
775 | ||
645ca708 | 776 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 777 | int proto) |
1da177e4 | 778 | { |
ca065d0c | 779 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 780 | struct net *net = dev_net(skb->dev); |
1ab1457c | 781 | struct udphdr *uh; |
ca065d0c | 782 | struct sock *sk; |
1da177e4 LT |
783 | u32 ulen = 0; |
784 | ||
785 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 786 | goto discard; |
1da177e4 | 787 | |
0660e03f ACM |
788 | saddr = &ipv6_hdr(skb)->saddr; |
789 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 790 | uh = udp_hdr(skb); |
1da177e4 LT |
791 | |
792 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
793 | if (ulen > skb->len) |
794 | goto short_packet; | |
1da177e4 | 795 | |
759e5d00 HX |
796 | if (proto == IPPROTO_UDP) { |
797 | /* UDP validates ulen. */ | |
1da177e4 | 798 | |
ba4e58ec GR |
799 | /* Check for jumbo payload */ |
800 | if (ulen == 0) | |
801 | ulen = skb->len; | |
1da177e4 | 802 | |
ba4e58ec GR |
803 | if (ulen < sizeof(*uh)) |
804 | goto short_packet; | |
1da177e4 | 805 | |
ba4e58ec GR |
806 | if (ulen < skb->len) { |
807 | if (pskb_trim_rcsum(skb, ulen)) | |
808 | goto short_packet; | |
0660e03f ACM |
809 | saddr = &ipv6_hdr(skb)->saddr; |
810 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 811 | uh = udp_hdr(skb); |
ba4e58ec | 812 | } |
ba4e58ec | 813 | } |
1da177e4 | 814 | |
759e5d00 | 815 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 816 | goto csum_error; |
759e5d00 | 817 | |
c9f2c1ae PA |
818 | /* Check if the socket is already available, e.g. due to early demux */ |
819 | sk = skb_steal_sock(skb); | |
820 | if (sk) { | |
821 | struct dst_entry *dst = skb_dst(skb); | |
822 | int ret; | |
823 | ||
824 | if (unlikely(sk->sk_rx_dst != dst)) | |
64f0f5d1 | 825 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae | 826 | |
eb63f296 PA |
827 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
828 | sock_put(sk); | |
829 | goto report_csum_error; | |
830 | } | |
c9f2c1ae | 831 | |
eb63f296 PA |
832 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
833 | sock_put(sk); | |
834 | return ret; | |
c9f2c1ae PA |
835 | } |
836 | ||
1ab1457c YH |
837 | /* |
838 | * Multicast receive code | |
1da177e4 | 839 | */ |
ba4e58ec | 840 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 841 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 842 | saddr, daddr, udptable, proto); |
1da177e4 LT |
843 | |
844 | /* Unicast */ | |
607c4aaf | 845 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 846 | if (sk) { |
eb63f296 PA |
847 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
848 | goto report_csum_error; | |
849 | return udp6_unicast_rcv_skb(sk, skb, uh); | |
1da177e4 | 850 | } |
1ab1457c | 851 | |
eb63f296 PA |
852 | if (!uh->check) |
853 | goto report_csum_error; | |
4068579e | 854 | |
cb80ef46 | 855 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 856 | goto discard; |
cb80ef46 BL |
857 | |
858 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 859 | goto csum_error; |
cb80ef46 | 860 | |
02c22347 | 861 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
862 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
863 | ||
864 | kfree_skb(skb); | |
add459aa | 865 | return 0; |
1da177e4 | 866 | |
1ab1457c | 867 | short_packet: |
ba7a46f1 JP |
868 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
869 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
870 | saddr, ntohs(uh->source), | |
871 | ulen, skb->len, | |
872 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 | 873 | goto discard; |
eb63f296 PA |
874 | |
875 | report_csum_error: | |
876 | udp6_csum_zero_error(skb); | |
6a5dc9e5 | 877 | csum_error: |
02c22347 | 878 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 879 | discard: |
02c22347 | 880 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 881 | kfree_skb(skb); |
add459aa | 882 | return 0; |
1da177e4 | 883 | } |
ba4e58ec | 884 | |
0bd84065 | 885 | |
5425077d | 886 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
887 | __be16 loc_port, const struct in6_addr *loc_addr, | |
888 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 889 | int dif, int sdif) |
5425077d | 890 | { |
0bd84065 | 891 | unsigned short hnum = ntohs(loc_port); |
f0b1e64c | 892 | unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
0bd84065 | 893 | unsigned int slot2 = hash2 & udp_table.mask; |
894 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
895 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); | |
5425077d | 896 | struct sock *sk; |
897 | ||
0bd84065 | 898 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 899 | if (sk->sk_state == TCP_ESTABLISHED && |
4297a0ef | 900 | INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 901 | return sk; |
902 | /* Only check first socket in chain */ | |
903 | break; | |
904 | } | |
905 | return NULL; | |
5425077d | 906 | } |
907 | ||
908 | static void udp_v6_early_demux(struct sk_buff *skb) | |
909 | { | |
910 | struct net *net = dev_net(skb->dev); | |
911 | const struct udphdr *uh; | |
912 | struct sock *sk; | |
913 | struct dst_entry *dst; | |
914 | int dif = skb->dev->ifindex; | |
4297a0ef | 915 | int sdif = inet6_sdif(skb); |
5425077d | 916 | |
917 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
918 | sizeof(struct udphdr))) | |
919 | return; | |
920 | ||
921 | uh = udp_hdr(skb); | |
922 | ||
923 | if (skb->pkt_type == PACKET_HOST) | |
924 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
925 | &ipv6_hdr(skb)->daddr, | |
926 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 927 | dif, sdif); |
5425077d | 928 | else |
929 | return; | |
930 | ||
41c6d650 | 931 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
5425077d | 932 | return; |
933 | ||
934 | skb->sk = sk; | |
935 | skb->destructor = sock_efree; | |
936 | dst = READ_ONCE(sk->sk_rx_dst); | |
937 | ||
938 | if (dst) | |
939 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); | |
940 | if (dst) { | |
d24406c8 WW |
941 | /* set noref for now. |
942 | * any place which wants to hold dst has to call | |
943 | * dst_hold_safe() | |
944 | */ | |
945 | skb_dst_set_noref(skb, dst); | |
5425077d | 946 | } |
947 | } | |
948 | ||
e5bbef20 | 949 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 950 | { |
645ca708 | 951 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
952 | } |
953 | ||
1da177e4 LT |
954 | /* |
955 | * Throw away all pending data and cancel the corking. Socket is locked. | |
956 | */ | |
957 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
958 | { | |
959 | struct udp_sock *up = udp_sk(sk); | |
960 | ||
36d926b9 DL |
961 | if (up->pending == AF_INET) |
962 | udp_flush_pending_frames(sk); | |
963 | else if (up->pending) { | |
1da177e4 LT |
964 | up->len = 0; |
965 | up->pending = 0; | |
966 | ip6_flush_pending_frames(sk); | |
1ab1457c | 967 | } |
1da177e4 LT |
968 | } |
969 | ||
d74bad4e AI |
970 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
971 | int addr_len) | |
972 | { | |
973 | /* The following checks are replicated from __ip6_datagram_connect() | |
974 | * and intended to prevent BPF program called below from accessing | |
975 | * bytes that are out of the bound specified by user in addr_len. | |
976 | */ | |
977 | if (uaddr->sa_family == AF_INET) { | |
978 | if (__ipv6_only_sock(sk)) | |
979 | return -EAFNOSUPPORT; | |
980 | return udp_pre_connect(sk, uaddr, addr_len); | |
981 | } | |
982 | ||
983 | if (addr_len < SIN6_LEN_RFC2133) | |
984 | return -EINVAL; | |
985 | ||
986 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); | |
987 | } | |
988 | ||
493c6be3 | 989 | /** |
67ba4152 IM |
990 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
991 | * @sk: socket we are sending on | |
992 | * @skb: sk_buff containing the filled-in UDP header | |
993 | * (checksum field must be zeroed out) | |
493c6be3 SS |
994 | */ |
995 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
996 | const struct in6_addr *saddr, | |
997 | const struct in6_addr *daddr, int len) | |
998 | { | |
999 | unsigned int offset; | |
1000 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1001 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1002 | __wsum csum = 0; |
1003 | ||
d39d938c | 1004 | if (!frags) { |
493c6be3 SS |
1005 | /* Only one fragment on the socket. */ |
1006 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1007 | skb->csum_offset = offsetof(struct udphdr, check); | |
1008 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1009 | } else { | |
1010 | /* | |
1011 | * HW-checksum won't work as there are two or more | |
1012 | * fragments on the socket so that all csums of sk_buffs | |
1013 | * should be together | |
1014 | */ | |
1015 | offset = skb_transport_offset(skb); | |
1016 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1017 | csum = skb->csum; |
493c6be3 SS |
1018 | |
1019 | skb->ip_summed = CHECKSUM_NONE; | |
1020 | ||
d39d938c VY |
1021 | do { |
1022 | csum = csum_add(csum, frags->csum); | |
1023 | } while ((frags = frags->next)); | |
493c6be3 SS |
1024 | |
1025 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1026 | csum); | |
1027 | if (uh->check == 0) | |
1028 | uh->check = CSUM_MANGLED_0; | |
1029 | } | |
1030 | } | |
1031 | ||
1da177e4 LT |
1032 | /* |
1033 | * Sending | |
1034 | */ | |
1035 | ||
bec1f6f6 WB |
1036 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1037 | struct inet_cork *cork) | |
1da177e4 | 1038 | { |
d39d938c | 1039 | struct sock *sk = skb->sk; |
1da177e4 | 1040 | struct udphdr *uh; |
1da177e4 | 1041 | int err = 0; |
b2bf1e26 | 1042 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1043 | __wsum csum = 0; |
d39d938c VY |
1044 | int offset = skb_transport_offset(skb); |
1045 | int len = skb->len - offset; | |
1da177e4 LT |
1046 | |
1047 | /* | |
1048 | * Create a UDP header | |
1049 | */ | |
4bedb452 | 1050 | uh = udp_hdr(skb); |
1958b856 DM |
1051 | uh->source = fl6->fl6_sport; |
1052 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1053 | uh->len = htons(len); |
1da177e4 LT |
1054 | uh->check = 0; |
1055 | ||
bec1f6f6 WB |
1056 | if (cork->gso_size) { |
1057 | const int hlen = skb_network_header_len(skb) + | |
1058 | sizeof(struct udphdr); | |
1059 | ||
1060 | if (hlen + cork->gso_size > cork->fragsize) | |
1061 | return -EINVAL; | |
1062 | if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) | |
1063 | return -EINVAL; | |
a8c744a8 WB |
1064 | if (udp_sk(sk)->no_check6_tx) |
1065 | return -EINVAL; | |
ff06342c WB |
1066 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || |
1067 | dst_xfrm(skb_dst(skb))) | |
bec1f6f6 WB |
1068 | return -EIO; |
1069 | ||
1070 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1071 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
a8c744a8 | 1072 | goto csum_partial; |
bec1f6f6 WB |
1073 | } |
1074 | ||
b2bf1e26 | 1075 | if (is_udplite) |
d39d938c VY |
1076 | csum = udplite_csum(skb); |
1077 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1078 | skb->ip_summed = CHECKSUM_NONE; |
1079 | goto send; | |
1080 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
a8c744a8 | 1081 | csum_partial: |
d39d938c | 1082 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1083 | goto send; |
1084 | } else | |
d39d938c | 1085 | csum = udp_csum(skb); |
1da177e4 | 1086 | |
ba4e58ec | 1087 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1088 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1089 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1090 | if (uh->check == 0) |
f6ab0288 | 1091 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1092 | |
493c6be3 | 1093 | send: |
d39d938c | 1094 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1095 | if (err) { |
1096 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1097 | UDP6_INC_STATS(sock_net(sk), |
1098 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1099 | err = 0; |
1100 | } | |
6aef70a8 ED |
1101 | } else { |
1102 | UDP6_INC_STATS(sock_net(sk), | |
1103 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1104 | } | |
d39d938c VY |
1105 | return err; |
1106 | } | |
1107 | ||
1108 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1109 | { | |
1110 | struct sk_buff *skb; | |
1111 | struct udp_sock *up = udp_sk(sk); | |
1112 | struct flowi6 fl6; | |
1113 | int err = 0; | |
1114 | ||
1115 | if (up->pending == AF_INET) | |
1116 | return udp_push_pending_frames(sk); | |
1117 | ||
1118 | /* ip6_finish_skb will release the cork, so make a copy of | |
1119 | * fl6 here. | |
1120 | */ | |
1121 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1122 | ||
1123 | skb = ip6_finish_skb(sk); | |
1124 | if (!skb) | |
1125 | goto out; | |
1126 | ||
bec1f6f6 | 1127 | err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); |
d39d938c | 1128 | |
1da177e4 LT |
1129 | out: |
1130 | up->len = 0; | |
1131 | up->pending = 0; | |
1132 | return err; | |
1133 | } | |
1134 | ||
1b784140 | 1135 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1136 | { |
1137 | struct ipv6_txoptions opt_space; | |
1138 | struct udp_sock *up = udp_sk(sk); | |
1139 | struct inet_sock *inet = inet_sk(sk); | |
1140 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1141 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1142 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1143 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1144 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1145 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1146 | struct flowi6 fl6; |
1da177e4 | 1147 | struct dst_entry *dst; |
26879da5 | 1148 | struct ipcm6_cookie ipc6; |
1da177e4 | 1149 | int addr_len = msg->msg_namelen; |
9f542f61 | 1150 | bool connected = false; |
1da177e4 | 1151 | int ulen = len; |
1da177e4 LT |
1152 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1153 | int err; | |
b2bf1e26 | 1154 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1155 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 | 1156 | |
b515430a | 1157 | ipcm6_init(&ipc6); |
bec1f6f6 | 1158 | ipc6.gso_size = up->gso_size; |
5fdaa88d | 1159 | ipc6.sockc.tsflags = sk->sk_tsflags; |
26879da5 | 1160 | |
1da177e4 LT |
1161 | /* destination address check */ |
1162 | if (sin6) { | |
1163 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1164 | return -EINVAL; | |
1165 | ||
1166 | switch (sin6->sin6_family) { | |
1167 | case AF_INET6: | |
1168 | if (addr_len < SIN6_LEN_RFC2133) | |
1169 | return -EINVAL; | |
1170 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1171 | if (ipv6_addr_any(daddr) && |
1172 | ipv6_addr_v4mapped(&np->saddr)) | |
1173 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1174 | daddr); | |
1da177e4 LT |
1175 | break; |
1176 | case AF_INET: | |
1177 | goto do_udp_sendmsg; | |
1178 | case AF_UNSPEC: | |
1179 | msg->msg_name = sin6 = NULL; | |
1180 | msg->msg_namelen = addr_len = 0; | |
1181 | daddr = NULL; | |
1182 | break; | |
1183 | default: | |
1184 | return -EINVAL; | |
1185 | } | |
1186 | } else if (!up->pending) { | |
1187 | if (sk->sk_state != TCP_ESTABLISHED) | |
1188 | return -EDESTADDRREQ; | |
efe4208f | 1189 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1190 | } else |
1da177e4 LT |
1191 | daddr = NULL; |
1192 | ||
1193 | if (daddr) { | |
e773e4fa | 1194 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1195 | struct sockaddr_in sin; |
1196 | sin.sin_family = AF_INET; | |
c720c7e8 | 1197 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1198 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1199 | msg->msg_name = &sin; | |
1200 | msg->msg_namelen = sizeof(sin); | |
1201 | do_udp_sendmsg: | |
1202 | if (__ipv6_only_sock(sk)) | |
1203 | return -ENETUNREACH; | |
1b784140 | 1204 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1205 | } |
1206 | } | |
1207 | ||
1208 | if (up->pending == AF_INET) | |
1b784140 | 1209 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1210 | |
1211 | /* Rough check on arithmetic overflow, | |
b59e139b | 1212 | better check is made in ip6_append_data(). |
1da177e4 LT |
1213 | */ |
1214 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1215 | return -EMSGSIZE; | |
1ab1457c | 1216 | |
03485f2a | 1217 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1218 | if (up->pending) { |
1219 | /* | |
1220 | * There are pending frames. | |
1221 | * The socket lock must be held while it's corked. | |
1222 | */ | |
1223 | lock_sock(sk); | |
1224 | if (likely(up->pending)) { | |
1225 | if (unlikely(up->pending != AF_INET6)) { | |
1226 | release_sock(sk); | |
1227 | return -EAFNOSUPPORT; | |
1228 | } | |
1229 | dst = NULL; | |
1230 | goto do_append_data; | |
1231 | } | |
1232 | release_sock(sk); | |
1233 | } | |
1234 | ulen += sizeof(struct udphdr); | |
1235 | ||
4c9483b2 | 1236 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1237 | |
1238 | if (sin6) { | |
1239 | if (sin6->sin6_port == 0) | |
1240 | return -EINVAL; | |
1241 | ||
1958b856 | 1242 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1243 | daddr = &sin6->sin6_addr; |
1244 | ||
1245 | if (np->sndflow) { | |
4c9483b2 DM |
1246 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1247 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1248 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1249 | if (!flowlabel) |
1da177e4 | 1250 | return -EINVAL; |
1da177e4 LT |
1251 | } |
1252 | } | |
1253 | ||
1254 | /* | |
1255 | * Otherwise it will be difficult to maintain | |
1256 | * sk->sk_dst_cache. | |
1257 | */ | |
1258 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1259 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1260 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1261 | |
1262 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1263 | sin6->sin6_scope_id && | |
842df073 | 1264 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1265 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1266 | } else { |
1267 | if (sk->sk_state != TCP_ESTABLISHED) | |
1268 | return -EDESTADDRREQ; | |
1269 | ||
1958b856 | 1270 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1271 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1272 | fl6.flowlabel = np->flow_label; |
9f542f61 | 1273 | connected = true; |
1da177e4 LT |
1274 | } |
1275 | ||
4c9483b2 DM |
1276 | if (!fl6.flowi6_oif) |
1277 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1278 | |
4c9483b2 DM |
1279 | if (!fl6.flowi6_oif) |
1280 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1281 | |
4c9483b2 | 1282 | fl6.flowi6_mark = sk->sk_mark; |
e2d118a1 | 1283 | fl6.flowi6_uid = sk->sk_uid; |
51953d5b | 1284 | |
1da177e4 LT |
1285 | if (msg->msg_controllen) { |
1286 | opt = &opt_space; | |
1287 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1288 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1289 | ipc6.opt = opt; |
1da177e4 | 1290 | |
2e8de857 WB |
1291 | err = udp_cmsg_send(sk, msg, &ipc6.gso_size); |
1292 | if (err > 0) | |
1293 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, | |
5fdaa88d | 1294 | &ipc6); |
1da177e4 LT |
1295 | if (err < 0) { |
1296 | fl6_sock_release(flowlabel); | |
1297 | return err; | |
1298 | } | |
4c9483b2 DM |
1299 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1300 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1301 | if (!flowlabel) |
1da177e4 LT |
1302 | return -EINVAL; |
1303 | } | |
1304 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1305 | opt = NULL; | |
9f542f61 | 1306 | connected = false; |
1da177e4 | 1307 | } |
45f6fad8 ED |
1308 | if (!opt) { |
1309 | opt = txopt_get(np); | |
1310 | opt_to_free = opt; | |
1311 | } | |
df9890c3 YH |
1312 | if (flowlabel) |
1313 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1314 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1315 | ipc6.opt = opt; |
1da177e4 | 1316 | |
4c9483b2 | 1317 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1318 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1319 | fl6.daddr = *daddr; |
876c7f41 | 1320 | else |
4c9483b2 DM |
1321 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1322 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1323 | fl6.saddr = np->saddr; |
1958b856 | 1324 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1325 | |
1cedee13 AI |
1326 | if (cgroup_bpf_enabled && !connected) { |
1327 | err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, | |
1328 | (struct sockaddr *)sin6, &fl6.saddr); | |
1329 | if (err) | |
1330 | goto out_no_dst; | |
1331 | if (sin6) { | |
1332 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { | |
1333 | /* BPF program rewrote IPv6-only by IPv4-mapped | |
1334 | * IPv6. It's currently unsupported. | |
1335 | */ | |
1336 | err = -ENOTSUPP; | |
1337 | goto out_no_dst; | |
1338 | } | |
1339 | if (sin6->sin6_port == 0) { | |
1340 | /* BPF program set invalid port. Reject it. */ | |
1341 | err = -EINVAL; | |
1342 | goto out_no_dst; | |
1343 | } | |
1344 | fl6.fl6_dport = sin6->sin6_port; | |
1345 | fl6.daddr = sin6->sin6_addr; | |
1346 | } | |
1347 | } | |
1348 | ||
4c9483b2 | 1349 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1350 | if (final_p) |
9f542f61 | 1351 | connected = false; |
1da177e4 | 1352 | |
4c9483b2 DM |
1353 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1354 | fl6.flowi6_oif = np->mcast_oif; | |
9f542f61 | 1355 | connected = false; |
c4062dfc EH |
1356 | } else if (!fl6.flowi6_oif) |
1357 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1358 | |
4c9483b2 | 1359 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1360 | |
38b7097b HFS |
1361 | if (ipc6.tclass < 0) |
1362 | ipc6.tclass = np->tclass; | |
1363 | ||
1364 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
1365 | ||
4f858c56 | 1366 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); |
68d0c6d3 DM |
1367 | if (IS_ERR(dst)) { |
1368 | err = PTR_ERR(dst); | |
1369 | dst = NULL; | |
1da177e4 | 1370 | goto out; |
14e50e57 | 1371 | } |
1da177e4 | 1372 | |
26879da5 WW |
1373 | if (ipc6.hlimit < 0) |
1374 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 LT |
1375 | |
1376 | if (msg->msg_flags&MSG_CONFIRM) | |
1377 | goto do_confirm; | |
1378 | back_from_confirm: | |
1379 | ||
03485f2a VY |
1380 | /* Lockless fast path for the non-corking case */ |
1381 | if (!corkreq) { | |
1cd7884d | 1382 | struct inet_cork_full cork; |
03485f2a VY |
1383 | struct sk_buff *skb; |
1384 | ||
1385 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1386 | sizeof(struct udphdr), &ipc6, |
03485f2a | 1387 | &fl6, (struct rt6_info *)dst, |
5fdaa88d | 1388 | msg->msg_flags, &cork); |
03485f2a VY |
1389 | err = PTR_ERR(skb); |
1390 | if (!IS_ERR_OR_NULL(skb)) | |
bec1f6f6 | 1391 | err = udp_v6_send_skb(skb, &fl6, &cork.base); |
4f858c56 | 1392 | goto out; |
03485f2a VY |
1393 | } |
1394 | ||
1da177e4 LT |
1395 | lock_sock(sk); |
1396 | if (unlikely(up->pending)) { | |
1397 | /* The socket is already corked while preparing it. */ | |
1398 | /* ... which is an evident application bug. --ANK */ | |
1399 | release_sock(sk); | |
1400 | ||
ba7a46f1 | 1401 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1402 | err = -EINVAL; |
1403 | goto out; | |
1404 | } | |
1405 | ||
1406 | up->pending = AF_INET6; | |
1407 | ||
1408 | do_append_data: | |
26879da5 WW |
1409 | if (ipc6.dontfrag < 0) |
1410 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1411 | up->len += ulen; |
26879da5 WW |
1412 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
1413 | &ipc6, &fl6, (struct rt6_info *)dst, | |
5fdaa88d | 1414 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
1da177e4 LT |
1415 | if (err) |
1416 | udp_v6_flush_pending_frames(sk); | |
1417 | else if (!corkreq) | |
4c0a6cb0 | 1418 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1419 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1420 | up->pending = 0; | |
1da177e4 | 1421 | |
03485f2a VY |
1422 | if (err > 0) |
1423 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1424 | release_sock(sk); | |
1425 | ||
1da177e4 | 1426 | out: |
a3c96089 | 1427 | dst_release(dst); |
1cedee13 | 1428 | out_no_dst: |
1da177e4 | 1429 | fl6_sock_release(flowlabel); |
45f6fad8 | 1430 | txopt_put(opt_to_free); |
cd562c98 | 1431 | if (!err) |
1da177e4 | 1432 | return len; |
a18135eb DM |
1433 | /* |
1434 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1435 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1436 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1437 | * things). We could add another new stat but at least for now that | |
1438 | * seems like overkill. | |
1439 | */ | |
1440 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1441 | UDP6_INC_STATS(sock_net(sk), |
1442 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1443 | } |
1da177e4 LT |
1444 | return err; |
1445 | ||
1446 | do_confirm: | |
0dec879f JA |
1447 | if (msg->msg_flags & MSG_PROBE) |
1448 | dst_confirm_neigh(dst, &fl6.daddr); | |
1da177e4 LT |
1449 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1450 | goto back_from_confirm; | |
1451 | err = 0; | |
1452 | goto out; | |
1453 | } | |
1454 | ||
7d06b2e0 | 1455 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1456 | { |
44046a59 | 1457 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1458 | lock_sock(sk); |
1459 | udp_v6_flush_pending_frames(sk); | |
1460 | release_sock(sk); | |
1461 | ||
60fb9567 PA |
1462 | if (static_branch_unlikely(&udpv6_encap_needed_key)) { |
1463 | if (up->encap_type) { | |
1464 | void (*encap_destroy)(struct sock *sk); | |
1465 | encap_destroy = READ_ONCE(up->encap_destroy); | |
1466 | if (encap_destroy) | |
1467 | encap_destroy(sk); | |
1468 | } | |
1469 | if (up->encap_enabled) | |
1470 | static_branch_disable(&udpv6_encap_needed_key); | |
44046a59 TP |
1471 | } |
1472 | ||
1da177e4 | 1473 | inet6_destroy_sock(sk); |
1da177e4 LT |
1474 | } |
1475 | ||
1476 | /* | |
1477 | * Socket option code for UDP | |
1478 | */ | |
ba4e58ec | 1479 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1480 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1481 | { |
db8dac20 | 1482 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1483 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1484 | udp_v6_push_pending_frames); | |
ba4e58ec | 1485 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1486 | } |
1487 | ||
1488 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1489 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1490 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1491 | { |
db8dac20 | 1492 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1493 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1494 | udp_v6_push_pending_frames); | |
ba4e58ec | 1495 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1496 | } |
1497 | #endif | |
1498 | ||
ba4e58ec GR |
1499 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1500 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1501 | { |
db8dac20 | 1502 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1503 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1504 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1505 | } |
1506 | ||
1507 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1508 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1509 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1510 | { |
db8dac20 | 1511 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1512 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1513 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1514 | } |
1515 | #endif | |
1516 | ||
a8e3bb34 DA |
1517 | /* thinking of making this const? Don't. |
1518 | * early_demux can change based on sysctl. | |
1519 | */ | |
dddb64bc | 1520 | static struct inet6_protocol udpv6_protocol = { |
5425077d | 1521 | .early_demux = udp_v6_early_demux, |
dddb64bc | 1522 | .early_demux_handler = udp_v6_early_demux, |
1da177e4 LT |
1523 | .handler = udpv6_rcv, |
1524 | .err_handler = udpv6_err, | |
1525 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1526 | }; | |
1527 | ||
1528 | /* ------------------------------------------------------------------------ */ | |
1529 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1530 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1531 | { |
17ef66af LC |
1532 | if (v == SEQ_START_TOKEN) { |
1533 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1534 | } else { | |
1535 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1536 | struct inet_sock *inet = inet_sk(v); | |
1537 | __u16 srcp = ntohs(inet->inet_sport); | |
1538 | __u16 destp = ntohs(inet->inet_dport); | |
6c206b20 PA |
1539 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
1540 | udp_rqueue_get(v), bucket); | |
17ef66af | 1541 | } |
1da177e4 LT |
1542 | return 0; |
1543 | } | |
1544 | ||
c3506372 | 1545 | const struct seq_operations udp6_seq_ops = { |
a3d2599b CH |
1546 | .start = udp_seq_start, |
1547 | .next = udp_seq_next, | |
1548 | .stop = udp_seq_stop, | |
1549 | .show = udp6_seq_show, | |
1550 | }; | |
c3506372 | 1551 | EXPORT_SYMBOL(udp6_seq_ops); |
73cb88ec | 1552 | |
1da177e4 | 1553 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 | 1554 | .family = AF_INET6, |
645ca708 | 1555 | .udp_table = &udp_table, |
1da177e4 LT |
1556 | }; |
1557 | ||
2c8c1e72 | 1558 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1559 | { |
c3506372 CH |
1560 | if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, |
1561 | sizeof(struct udp_iter_state), &udp6_seq_afinfo)) | |
a3d2599b CH |
1562 | return -ENOMEM; |
1563 | return 0; | |
1da177e4 LT |
1564 | } |
1565 | ||
ec120da6 IM |
1566 | void udp6_proc_exit(struct net *net) |
1567 | { | |
a3d2599b | 1568 | remove_proc_entry("udp6", net->proc_net); |
1da177e4 LT |
1569 | } |
1570 | #endif /* CONFIG_PROC_FS */ | |
1571 | ||
1572 | /* ------------------------------------------------------------------------ */ | |
1573 | ||
1574 | struct proto udpv6_prot = { | |
1e802951 TZ |
1575 | .name = "UDPv6", |
1576 | .owner = THIS_MODULE, | |
1577 | .close = udp_lib_close, | |
d74bad4e | 1578 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1579 | .connect = ip6_datagram_connect, |
1580 | .disconnect = udp_disconnect, | |
1581 | .ioctl = udp_ioctl, | |
1582 | .init = udp_init_sock, | |
1583 | .destroy = udpv6_destroy_sock, | |
1584 | .setsockopt = udpv6_setsockopt, | |
1585 | .getsockopt = udpv6_getsockopt, | |
1586 | .sendmsg = udpv6_sendmsg, | |
1587 | .recvmsg = udpv6_recvmsg, | |
1588 | .release_cb = ip6_datagram_release_cb, | |
1589 | .hash = udp_lib_hash, | |
1590 | .unhash = udp_lib_unhash, | |
1591 | .rehash = udp_v6_rehash, | |
1592 | .get_port = udp_v6_get_port, | |
1593 | .memory_allocated = &udp_memory_allocated, | |
1594 | .sysctl_mem = sysctl_udp_mem, | |
1595 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), | |
1596 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), | |
1597 | .obj_size = sizeof(struct udp6_sock), | |
1598 | .h.udp_table = &udp_table, | |
3fdadf7d | 1599 | #ifdef CONFIG_COMPAT |
1e802951 TZ |
1600 | .compat_setsockopt = compat_udpv6_setsockopt, |
1601 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1602 | #endif |
1e802951 | 1603 | .diag_destroy = udp_abort, |
1da177e4 LT |
1604 | }; |
1605 | ||
1da177e4 LT |
1606 | static struct inet_protosw udpv6_protosw = { |
1607 | .type = SOCK_DGRAM, | |
1608 | .protocol = IPPROTO_UDP, | |
1609 | .prot = &udpv6_prot, | |
1610 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1611 | .flags = INET_PROTOSW_PERMANENT, |
1612 | }; | |
1613 | ||
7f4e4868 | 1614 | int __init udpv6_init(void) |
1da177e4 | 1615 | { |
7f4e4868 DL |
1616 | int ret; |
1617 | ||
3336288a VY |
1618 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1619 | if (ret) | |
c6b641a4 | 1620 | goto out; |
3336288a | 1621 | |
7f4e4868 DL |
1622 | ret = inet6_register_protosw(&udpv6_protosw); |
1623 | if (ret) | |
1624 | goto out_udpv6_protocol; | |
1625 | out: | |
1626 | return ret; | |
1627 | ||
1628 | out_udpv6_protocol: | |
1629 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1630 | goto out; | |
1631 | } | |
1632 | ||
09f7709f | 1633 | void udpv6_exit(void) |
7f4e4868 DL |
1634 | { |
1635 | inet6_unregister_protosw(&udpv6_protosw); | |
1636 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1637 | } |