Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * UDP over IPv6 | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
7 | * |
8 | * Based on linux/ipv4/udp.c | |
9 | * | |
1da177e4 LT |
10 | * Fixes: |
11 | * Hideaki YOSHIFUJI : sin6_scope_id support | |
12 | * YOSHIFUJI Hideaki @USAGI and: Support IPV6_V6ONLY socket option, which | |
13 | * Alexey Kuznetsov allow both IPv4 and IPv6 sockets to bind | |
14 | * a single port at the same time. | |
15 | * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data | |
16 | * YOSHIFUJI Hideaki @USAGI: convert /proc/net/udp6 to seq_file. | |
17 | * | |
18 | * This program is free software; you can redistribute it and/or | |
19 | * modify it under the terms of the GNU General Public License | |
20 | * as published by the Free Software Foundation; either version | |
21 | * 2 of the License, or (at your option) any later version. | |
22 | */ | |
23 | ||
1da177e4 LT |
24 | #include <linux/errno.h> |
25 | #include <linux/types.h> | |
26 | #include <linux/socket.h> | |
27 | #include <linux/sockios.h> | |
1da177e4 LT |
28 | #include <linux/net.h> |
29 | #include <linux/in6.h> | |
30 | #include <linux/netdevice.h> | |
31 | #include <linux/if_arp.h> | |
32 | #include <linux/ipv6.h> | |
33 | #include <linux/icmpv6.h> | |
34 | #include <linux/init.h> | |
1781f7f5 | 35 | #include <linux/module.h> |
3305b80c | 36 | #include <linux/skbuff.h> |
5a0e3ad6 | 37 | #include <linux/slab.h> |
7c0f6ba6 | 38 | #include <linux/uaccess.h> |
1da177e4 | 39 | |
496611d7 | 40 | #include <net/addrconf.h> |
1da177e4 LT |
41 | #include <net/ndisc.h> |
42 | #include <net/protocol.h> | |
43 | #include <net/transp_v6.h> | |
44 | #include <net/ip6_route.h> | |
1da177e4 | 45 | #include <net/raw.h> |
c752f073 | 46 | #include <net/tcp_states.h> |
1da177e4 LT |
47 | #include <net/ip6_checksum.h> |
48 | #include <net/xfrm.h> | |
0bd84065 | 49 | #include <net/inet_hashtables.h> |
72289b96 | 50 | #include <net/inet6_hashtables.h> |
076bb0c8 | 51 | #include <net/busy_poll.h> |
e32ea7e7 | 52 | #include <net/sock_reuseport.h> |
1da177e4 LT |
53 | |
54 | #include <linux/proc_fs.h> | |
55 | #include <linux/seq_file.h> | |
22911fc5 | 56 | #include <trace/events/skb.h> |
ba4e58ec | 57 | #include "udp_impl.h" |
1da177e4 | 58 | |
63a6fff3 RS |
59 | static bool udp6_lib_exact_dif_match(struct net *net, struct sk_buff *skb) |
60 | { | |
61 | #if defined(CONFIG_NET_L3_MASTER_DEV) | |
62 | if (!net->ipv4.sysctl_udp_l3mdev_accept && | |
63 | skb && ipv6_l3mdev_skb(IP6CB(skb)->flags)) | |
64 | return true; | |
65 | #endif | |
66 | return false; | |
67 | } | |
68 | ||
6eada011 ED |
69 | static u32 udp6_ehashfn(const struct net *net, |
70 | const struct in6_addr *laddr, | |
71 | const u16 lport, | |
72 | const struct in6_addr *faddr, | |
73 | const __be16 fport) | |
b50026b5 | 74 | { |
1bbdceef HFS |
75 | static u32 udp6_ehash_secret __read_mostly; |
76 | static u32 udp_ipv6_hash_secret __read_mostly; | |
77 | ||
78 | u32 lhash, fhash; | |
79 | ||
80 | net_get_random_once(&udp6_ehash_secret, | |
81 | sizeof(udp6_ehash_secret)); | |
82 | net_get_random_once(&udp_ipv6_hash_secret, | |
83 | sizeof(udp_ipv6_hash_secret)); | |
84 | ||
85 | lhash = (__force u32)laddr->s6_addr32[3]; | |
86 | fhash = __ipv6_addr_jhash(faddr, udp_ipv6_hash_secret); | |
87 | ||
b50026b5 | 88 | return __inet6_ehashfn(lhash, lport, fhash, fport, |
1bbdceef | 89 | udp_ipv6_hash_secret + net_hash_mix(net)); |
b50026b5 HFS |
90 | } |
91 | ||
6ba5a3c5 | 92 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 93 | { |
30fff923 | 94 | unsigned int hash2_nulladdr = |
f0b1e64c | 95 | ipv6_portaddr_hash(sock_net(sk), &in6addr_any, snum); |
9a52e97e | 96 | unsigned int hash2_partial = |
f0b1e64c | 97 | ipv6_portaddr_hash(sock_net(sk), &sk->sk_v6_rcv_saddr, 0); |
30fff923 | 98 | |
d4cada4a | 99 | /* precompute partial secondary hash */ |
30fff923 | 100 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
fe38d2a1 | 101 | return udp_lib_get_port(sk, snum, hash2_nulladdr); |
1da177e4 LT |
102 | } |
103 | ||
719f8358 ED |
104 | static void udp_v6_rehash(struct sock *sk) |
105 | { | |
f0b1e64c | 106 | u16 new_hash = ipv6_portaddr_hash(sock_net(sk), |
efe4208f | 107 | &sk->sk_v6_rcv_saddr, |
719f8358 ED |
108 | inet_sk(sk)->inet_num); |
109 | ||
110 | udp_lib_rehash(sk, new_hash); | |
111 | } | |
112 | ||
d1e37288 SX |
113 | static int compute_score(struct sock *sk, struct net *net, |
114 | const struct in6_addr *saddr, __be16 sport, | |
115 | const struct in6_addr *daddr, unsigned short hnum, | |
1801b570 | 116 | int dif, int sdif, bool exact_dif) |
645ca708 | 117 | { |
60c04aec JP |
118 | int score; |
119 | struct inet_sock *inet; | |
120 | ||
121 | if (!net_eq(sock_net(sk), net) || | |
122 | udp_sk(sk)->udp_port_hash != hnum || | |
123 | sk->sk_family != PF_INET6) | |
124 | return -1; | |
125 | ||
126 | score = 0; | |
127 | inet = inet_sk(sk); | |
128 | ||
129 | if (inet->inet_dport) { | |
130 | if (inet->inet_dport != sport) | |
131 | return -1; | |
132 | score++; | |
133 | } | |
134 | ||
135 | if (!ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { | |
136 | if (!ipv6_addr_equal(&sk->sk_v6_rcv_saddr, daddr)) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | ||
141 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { | |
142 | if (!ipv6_addr_equal(&sk->sk_v6_daddr, saddr)) | |
143 | return -1; | |
144 | score++; | |
145 | } | |
146 | ||
63a6fff3 | 147 | if (sk->sk_bound_dev_if || exact_dif) { |
1801b570 DA |
148 | bool dev_match = (sk->sk_bound_dev_if == dif || |
149 | sk->sk_bound_dev_if == sdif); | |
150 | ||
69678bcd | 151 | if (!dev_match) |
60c04aec | 152 | return -1; |
69678bcd | 153 | if (sk->sk_bound_dev_if) |
1801b570 | 154 | score++; |
645ca708 | 155 | } |
60c04aec | 156 | |
70da268b ED |
157 | if (sk->sk_incoming_cpu == raw_smp_processor_id()) |
158 | score++; | |
159 | ||
645ca708 ED |
160 | return score; |
161 | } | |
162 | ||
d1e37288 | 163 | /* called with rcu_read_lock() */ |
fddc17de ED |
164 | static struct sock *udp6_lib_lookup2(struct net *net, |
165 | const struct in6_addr *saddr, __be16 sport, | |
1801b570 DA |
166 | const struct in6_addr *daddr, unsigned int hnum, |
167 | int dif, int sdif, bool exact_dif, | |
168 | struct udp_hslot *hslot2, struct sk_buff *skb) | |
fddc17de ED |
169 | { |
170 | struct sock *sk, *result; | |
e94a62f5 | 171 | int score, badness; |
72289b96 | 172 | u32 hash = 0; |
fddc17de | 173 | |
fddc17de ED |
174 | result = NULL; |
175 | badness = -1; | |
ca065d0c | 176 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
d1e37288 | 177 | score = compute_score(sk, net, saddr, sport, |
1801b570 | 178 | daddr, hnum, dif, sdif, exact_dif); |
fddc17de | 179 | if (score > badness) { |
e94a62f5 | 180 | if (sk->sk_reuseport) { |
b50026b5 HFS |
181 | hash = udp6_ehashfn(net, daddr, hnum, |
182 | saddr, sport); | |
ed0dfffd | 183 | |
ca065d0c | 184 | result = reuseport_select_sock(sk, hash, skb, |
ed0dfffd | 185 | sizeof(struct udphdr)); |
ca065d0c ED |
186 | if (result) |
187 | return result; | |
70da268b | 188 | } |
ca065d0c ED |
189 | result = sk; |
190 | badness = score; | |
fddc17de ED |
191 | } |
192 | } | |
fddc17de ED |
193 | return result; |
194 | } | |
195 | ||
ca065d0c | 196 | /* rcu_read_lock() must be held */ |
fce82338 | 197 | struct sock *__udp6_lib_lookup(struct net *net, |
1801b570 DA |
198 | const struct in6_addr *saddr, __be16 sport, |
199 | const struct in6_addr *daddr, __be16 dport, | |
200 | int dif, int sdif, struct udp_table *udptable, | |
201 | struct sk_buff *skb) | |
1da177e4 | 202 | { |
271b72c7 | 203 | struct sock *sk, *result; |
1da177e4 | 204 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
205 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
206 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
63a6fff3 | 207 | bool exact_dif = udp6_lib_exact_dif_match(net, skb); |
e94a62f5 | 208 | int score, badness; |
72289b96 | 209 | u32 hash = 0; |
645ca708 | 210 | |
fddc17de | 211 | if (hslot->count > 10) { |
f0b1e64c | 212 | hash2 = ipv6_portaddr_hash(net, daddr, hnum); |
fddc17de ED |
213 | slot2 = hash2 & udptable->mask; |
214 | hslot2 = &udptable->hash2[slot2]; | |
215 | if (hslot->count < hslot2->count) | |
216 | goto begin; | |
217 | ||
218 | result = udp6_lib_lookup2(net, saddr, sport, | |
1801b570 | 219 | daddr, hnum, dif, sdif, exact_dif, |
d1e37288 | 220 | hslot2, skb); |
fddc17de | 221 | if (!result) { |
d1e37288 | 222 | unsigned int old_slot2 = slot2; |
f0b1e64c | 223 | hash2 = ipv6_portaddr_hash(net, &in6addr_any, hnum); |
fddc17de | 224 | slot2 = hash2 & udptable->mask; |
d1e37288 SX |
225 | /* avoid searching the same slot again. */ |
226 | if (unlikely(slot2 == old_slot2)) | |
227 | return result; | |
228 | ||
fddc17de ED |
229 | hslot2 = &udptable->hash2[slot2]; |
230 | if (hslot->count < hslot2->count) | |
231 | goto begin; | |
232 | ||
1223c67c | 233 | result = udp6_lib_lookup2(net, saddr, sport, |
1801b570 | 234 | daddr, hnum, dif, sdif, |
63a6fff3 RS |
235 | exact_dif, hslot2, |
236 | skb); | |
fddc17de | 237 | } |
8217ca65 MKL |
238 | if (unlikely(IS_ERR(result))) |
239 | return NULL; | |
fddc17de ED |
240 | return result; |
241 | } | |
271b72c7 ED |
242 | begin: |
243 | result = NULL; | |
244 | badness = -1; | |
ca065d0c | 245 | sk_for_each_rcu(sk, &hslot->head) { |
63a6fff3 | 246 | score = compute_score(sk, net, saddr, sport, daddr, hnum, dif, |
1801b570 | 247 | sdif, exact_dif); |
645ca708 | 248 | if (score > badness) { |
e94a62f5 | 249 | if (sk->sk_reuseport) { |
b50026b5 HFS |
250 | hash = udp6_ehashfn(net, daddr, hnum, |
251 | saddr, sport); | |
ca065d0c | 252 | result = reuseport_select_sock(sk, hash, skb, |
538950a1 | 253 | sizeof(struct udphdr)); |
8217ca65 MKL |
254 | if (unlikely(IS_ERR(result))) |
255 | return NULL; | |
ca065d0c ED |
256 | if (result) |
257 | return result; | |
72289b96 | 258 | } |
ca065d0c ED |
259 | result = sk; |
260 | badness = score; | |
1da177e4 LT |
261 | } |
262 | } | |
1da177e4 LT |
263 | return result; |
264 | } | |
fce82338 | 265 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 266 | |
607c4aaf KK |
267 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
268 | __be16 sport, __be16 dport, | |
645ca708 | 269 | struct udp_table *udptable) |
607c4aaf | 270 | { |
b71d1d42 | 271 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 272 | |
ed7cbbce | 273 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
adf30907 | 274 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 275 | inet6_sdif(skb), udptable, skb); |
607c4aaf KK |
276 | } |
277 | ||
63058308 TH |
278 | struct sock *udp6_lib_lookup_skb(struct sk_buff *skb, |
279 | __be16 sport, __be16 dport) | |
280 | { | |
281 | const struct ipv6hdr *iph = ipv6_hdr(skb); | |
63058308 | 282 | |
ed7cbbce | 283 | return __udp6_lib_lookup(dev_net(skb->dev), &iph->saddr, sport, |
63058308 | 284 | &iph->daddr, dport, inet6_iif(skb), |
1801b570 | 285 | inet6_sdif(skb), &udp_table, skb); |
63058308 TH |
286 | } |
287 | EXPORT_SYMBOL_GPL(udp6_lib_lookup_skb); | |
288 | ||
ca065d0c ED |
289 | /* Must be called under rcu_read_lock(). |
290 | * Does increment socket refcount. | |
291 | */ | |
6e86000c | 292 | #if IS_ENABLED(CONFIG_NF_TPROXY_IPV6) || IS_ENABLED(CONFIG_NF_SOCKET_IPV6) |
aa976fc0 BS |
293 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
294 | const struct in6_addr *daddr, __be16 dport, int dif) | |
295 | { | |
ca065d0c ED |
296 | struct sock *sk; |
297 | ||
298 | sk = __udp6_lib_lookup(net, saddr, sport, daddr, dport, | |
1801b570 | 299 | dif, 0, &udp_table, NULL); |
41c6d650 | 300 | if (sk && !refcount_inc_not_zero(&sk->sk_refcnt)) |
ca065d0c ED |
301 | sk = NULL; |
302 | return sk; | |
aa976fc0 BS |
303 | } |
304 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
ca065d0c | 305 | #endif |
aa976fc0 | 306 | |
cb891fa6 PA |
307 | /* do not use the scratch area len for jumbogram: their length execeeds the |
308 | * scratch area space; note that the IP6CB flags is still in the first | |
309 | * cacheline, so checking for jumbograms is cheap | |
310 | */ | |
311 | static int udp6_skb_len(struct sk_buff *skb) | |
312 | { | |
313 | return unlikely(inet6_is_jumbogram(skb)) ? skb->len : udp_skb_len(skb); | |
314 | } | |
315 | ||
1da177e4 | 316 | /* |
67ba4152 IM |
317 | * This should be easy, if there is something there we |
318 | * return it, otherwise we block. | |
1da177e4 LT |
319 | */ |
320 | ||
1b784140 | 321 | int udpv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len, |
1da177e4 LT |
322 | int noblock, int flags, int *addr_len) |
323 | { | |
324 | struct ipv6_pinfo *np = inet6_sk(sk); | |
325 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 326 | struct sk_buff *skb; |
59c2cdae | 327 | unsigned int ulen, copied; |
627d2d6b | 328 | int peeked, peeking, off; |
759e5d00 HX |
329 | int err; |
330 | int is_udplite = IS_UDPLITE(sk); | |
197c949e | 331 | bool checksum_valid = false; |
f26ba175 | 332 | int is_udp4; |
1da177e4 | 333 | |
1da177e4 | 334 | if (flags & MSG_ERRQUEUE) |
85fbaa75 | 335 | return ipv6_recv_error(sk, msg, len, addr_len); |
1da177e4 | 336 | |
4b340ae2 | 337 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
85fbaa75 | 338 | return ipv6_recv_rxpmtu(sk, msg, len, addr_len); |
4b340ae2 | 339 | |
1da177e4 | 340 | try_again: |
a0917e0b MD |
341 | peeking = flags & MSG_PEEK; |
342 | off = sk_peek_offset(sk, flags); | |
7c13f97f | 343 | skb = __skb_recv_udp(sk, flags, noblock, &peeked, &off, &err); |
1da177e4 | 344 | if (!skb) |
627d2d6b | 345 | return err; |
1da177e4 | 346 | |
cb891fa6 | 347 | ulen = udp6_skb_len(skb); |
59c2cdae | 348 | copied = len; |
627d2d6b | 349 | if (copied > ulen - off) |
350 | copied = ulen - off; | |
59c2cdae | 351 | else if (copied < ulen) |
1ab1457c | 352 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 353 | |
f26ba175 WY |
354 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
355 | ||
ba4e58ec | 356 | /* |
759e5d00 HX |
357 | * If checksum is needed at all, try to do it while copying the |
358 | * data. If the data is truncated, or if we only want a partial | |
359 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 360 | */ |
ba4e58ec | 361 | |
d21dbdfe ED |
362 | if (copied < ulen || peeking || |
363 | (is_udplite && UDP_SKB_CB(skb)->partial_cov)) { | |
67a51780 PA |
364 | checksum_valid = udp_skb_csum_unnecessary(skb) || |
365 | !__udp_lib_checksum_complete(skb); | |
197c949e | 366 | if (!checksum_valid) |
1da177e4 | 367 | goto csum_copy_err; |
ba4e58ec GR |
368 | } |
369 | ||
67a51780 PA |
370 | if (checksum_valid || udp_skb_csum_unnecessary(skb)) { |
371 | if (udp_skb_is_linear(skb)) | |
372 | err = copy_linear_skb(skb, copied, off, &msg->msg_iter); | |
373 | else | |
374 | err = skb_copy_datagram_msg(skb, off, msg, copied); | |
375 | } else { | |
627d2d6b | 376 | err = skb_copy_and_csum_datagram_msg(skb, off, msg); |
1da177e4 LT |
377 | if (err == -EINVAL) |
378 | goto csum_copy_err; | |
379 | } | |
22911fc5 | 380 | if (unlikely(err)) { |
979402b1 ED |
381 | if (!peeked) { |
382 | atomic_inc(&sk->sk_drops); | |
383 | if (is_udp4) | |
6aef70a8 ED |
384 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
385 | is_udplite); | |
979402b1 | 386 | else |
6aef70a8 ED |
387 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, |
388 | is_udplite); | |
979402b1 | 389 | } |
850cbadd | 390 | kfree_skb(skb); |
627d2d6b | 391 | return err; |
22911fc5 | 392 | } |
f26ba175 WY |
393 | if (!peeked) { |
394 | if (is_udp4) | |
6aef70a8 ED |
395 | UDP_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
396 | is_udplite); | |
f26ba175 | 397 | else |
6aef70a8 ED |
398 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INDATAGRAMS, |
399 | is_udplite); | |
f26ba175 | 400 | } |
cb75994e | 401 | |
3b885787 | 402 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
403 | |
404 | /* Copy the address. */ | |
405 | if (msg->msg_name) { | |
342dfc30 | 406 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
1da177e4 | 407 | sin6->sin6_family = AF_INET6; |
4bedb452 | 408 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 | 409 | sin6->sin6_flowinfo = 0; |
1da177e4 | 410 | |
842df073 | 411 | if (is_udp4) { |
b301e82c BH |
412 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
413 | &sin6->sin6_addr); | |
842df073 HFS |
414 | sin6->sin6_scope_id = 0; |
415 | } else { | |
4e3fd7a0 | 416 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
842df073 HFS |
417 | sin6->sin6_scope_id = |
418 | ipv6_iface_scope_id(&sin6->sin6_addr, | |
4330487a | 419 | inet6_iif(skb)); |
1da177e4 | 420 | } |
bceaa902 | 421 | *addr_len = sizeof(*sin6); |
1da177e4 | 422 | } |
4b261c75 HFS |
423 | |
424 | if (np->rxopt.all) | |
425 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
426 | ||
f26ba175 | 427 | if (is_udp4) { |
1da177e4 | 428 | if (inet->cmsg_flags) |
ad959036 | 429 | ip_cmsg_recv_offset(msg, sk, skb, |
10df8e61 | 430 | sizeof(struct udphdr), off); |
1da177e4 LT |
431 | } else { |
432 | if (np->rxopt.all) | |
4b261c75 | 433 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
1ab1457c | 434 | } |
1da177e4 | 435 | |
59c2cdae | 436 | err = copied; |
1da177e4 | 437 | if (flags & MSG_TRUNC) |
759e5d00 | 438 | err = ulen; |
1da177e4 | 439 | |
850cbadd | 440 | skb_consume_udp(sk, skb, peeking ? -err : err); |
1da177e4 LT |
441 | return err; |
442 | ||
443 | csum_copy_err: | |
2276f58a PA |
444 | if (!__sk_queue_drop_skb(sk, &udp_sk(sk)->reader_queue, skb, flags, |
445 | udp_skb_destructor)) { | |
6a5dc9e5 | 446 | if (is_udp4) { |
6aef70a8 ED |
447 | UDP_INC_STATS(sock_net(sk), |
448 | UDP_MIB_CSUMERRORS, is_udplite); | |
449 | UDP_INC_STATS(sock_net(sk), | |
450 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 451 | } else { |
6aef70a8 ED |
452 | UDP6_INC_STATS(sock_net(sk), |
453 | UDP_MIB_CSUMERRORS, is_udplite); | |
454 | UDP6_INC_STATS(sock_net(sk), | |
455 | UDP_MIB_INERRORS, is_udplite); | |
6a5dc9e5 | 456 | } |
0856f939 | 457 | } |
850cbadd | 458 | kfree_skb(skb); |
1da177e4 | 459 | |
beb39db5 ED |
460 | /* starting over for a new packet, but check if we need to yield */ |
461 | cond_resched(); | |
9cfaa8de | 462 | msg->msg_flags &= ~MSG_TRUNC; |
1da177e4 LT |
463 | goto try_again; |
464 | } | |
465 | ||
ba4e58ec | 466 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 467 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 468 | struct udp_table *udptable) |
1da177e4 LT |
469 | { |
470 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
471 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
472 | const struct in6_addr *saddr = &hdr->saddr; | |
473 | const struct in6_addr *daddr = &hdr->daddr; | |
67ba4152 | 474 | struct udphdr *uh = (struct udphdr *)(skb->data+offset); |
1da177e4 | 475 | struct sock *sk; |
e0d8c1b7 | 476 | int harderr; |
1da177e4 | 477 | int err; |
7304fe46 | 478 | struct net *net = dev_net(skb->dev); |
1da177e4 | 479 | |
e32ea7e7 | 480 | sk = __udp6_lib_lookup(net, daddr, uh->dest, saddr, uh->source, |
f64bf6b8 | 481 | inet6_iif(skb), inet6_sdif(skb), udptable, skb); |
63159f29 | 482 | if (!sk) { |
a16292a0 ED |
483 | __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), |
484 | ICMP6_MIB_INERRORS); | |
1da177e4 | 485 | return; |
7304fe46 | 486 | } |
1da177e4 | 487 | |
e0d8c1b7 WW |
488 | harderr = icmpv6_err_convert(type, code, &err); |
489 | np = inet6_sk(sk); | |
490 | ||
93b36cf3 HFS |
491 | if (type == ICMPV6_PKT_TOOBIG) { |
492 | if (!ip6_sk_accept_pmtu(sk)) | |
493 | goto out; | |
81aded24 | 494 | ip6_sk_update_pmtu(skb, sk, info); |
e0d8c1b7 WW |
495 | if (np->pmtudisc != IPV6_PMTUDISC_DONT) |
496 | harderr = 1; | |
93b36cf3 | 497 | } |
1a462d18 | 498 | if (type == NDISC_REDIRECT) { |
ec18d9a2 | 499 | ip6_sk_redirect(skb, sk); |
1a462d18 DJ |
500 | goto out; |
501 | } | |
81aded24 | 502 | |
e0d8c1b7 WW |
503 | if (!np->recverr) { |
504 | if (!harderr || sk->sk_state != TCP_ESTABLISHED) | |
505 | goto out; | |
506 | } else { | |
1da177e4 | 507 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
e0d8c1b7 | 508 | } |
b1faf566 | 509 | |
1da177e4 LT |
510 | sk->sk_err = err; |
511 | sk->sk_error_report(sk); | |
512 | out: | |
ca065d0c | 513 | return; |
1da177e4 LT |
514 | } |
515 | ||
a3f96c47 | 516 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
f7ad74fe BL |
517 | { |
518 | int rc; | |
519 | ||
efe4208f | 520 | if (!ipv6_addr_any(&sk->sk_v6_daddr)) { |
f7ad74fe | 521 | sock_rps_save_rxhash(sk, skb); |
005ec974 | 522 | sk_mark_napi_id(sk, skb); |
2c8c56e1 | 523 | sk_incoming_cpu_update(sk); |
e68b6e50 ED |
524 | } else { |
525 | sk_mark_napi_id_once(sk, skb); | |
005ec974 | 526 | } |
f7ad74fe | 527 | |
850cbadd | 528 | rc = __udp_enqueue_schedule_skb(sk, skb); |
f7ad74fe BL |
529 | if (rc < 0) { |
530 | int is_udplite = IS_UDPLITE(sk); | |
531 | ||
532 | /* Note that an ENOMEM error is charged twice */ | |
533 | if (rc == -ENOMEM) | |
e61da9e2 | 534 | UDP6_INC_STATS(sock_net(sk), |
02c22347 | 535 | UDP_MIB_RCVBUFERRORS, is_udplite); |
e61da9e2 | 536 | UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
f7ad74fe BL |
537 | kfree_skb(skb); |
538 | return -1; | |
539 | } | |
850cbadd | 540 | |
f7ad74fe BL |
541 | return 0; |
542 | } | |
543 | ||
ba4e58ec | 544 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba | 545 | struct inet6_skb_parm *opt, u8 type, |
67ba4152 | 546 | u8 code, int offset, __be32 info) |
ba4e58ec | 547 | { |
645ca708 | 548 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
549 | } |
550 | ||
f2e9de21 | 551 | DEFINE_STATIC_KEY_FALSE(udpv6_encap_needed_key); |
d7f3f621 BL |
552 | void udpv6_encap_enable(void) |
553 | { | |
88ab3108 | 554 | static_branch_enable(&udpv6_encap_needed_key); |
d7f3f621 BL |
555 | } |
556 | EXPORT_SYMBOL(udpv6_encap_enable); | |
557 | ||
a3f96c47 | 558 | static int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 559 | { |
ba4e58ec | 560 | struct udp_sock *up = udp_sk(sk); |
b2bf1e26 | 561 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 562 | |
ba4e58ec GR |
563 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
564 | goto drop; | |
1da177e4 | 565 | |
88ab3108 | 566 | if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { |
d7f3f621 BL |
567 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); |
568 | ||
569 | /* | |
570 | * This is an encapsulation socket so pass the skb to | |
571 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
572 | * fall through and pass this up the UDP socket. | |
573 | * up->encap_rcv() returns the following value: | |
574 | * =0 if skb was successfully passed to the encap | |
575 | * handler or was discarded by it. | |
576 | * >0 if skb should be passed on to UDP. | |
577 | * <0 if skb should be resubmitted as proto -N | |
578 | */ | |
579 | ||
580 | /* if we're overly short, let UDP handle it */ | |
6aa7de05 | 581 | encap_rcv = READ_ONCE(up->encap_rcv); |
e5aed006 | 582 | if (encap_rcv) { |
d7f3f621 BL |
583 | int ret; |
584 | ||
0a80966b TH |
585 | /* Verify checksum before giving to encap */ |
586 | if (udp_lib_checksum_complete(skb)) | |
587 | goto csum_error; | |
588 | ||
d7f3f621 BL |
589 | ret = encap_rcv(sk, skb); |
590 | if (ret <= 0) { | |
02c22347 ED |
591 | __UDP_INC_STATS(sock_net(sk), |
592 | UDP_MIB_INDATAGRAMS, | |
593 | is_udplite); | |
d7f3f621 BL |
594 | return -ret; |
595 | } | |
596 | } | |
597 | ||
598 | /* FALLTHROUGH -- it's a UDP Packet */ | |
599 | } | |
600 | ||
ba4e58ec GR |
601 | /* |
602 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
603 | */ | |
b2bf1e26 | 604 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
605 | |
606 | if (up->pcrlen == 0) { /* full coverage was set */ | |
ba7a46f1 JP |
607 | net_dbg_ratelimited("UDPLITE6: partial coverage %d while full coverage %d requested\n", |
608 | UDP_SKB_CB(skb)->cscov, skb->len); | |
ba4e58ec GR |
609 | goto drop; |
610 | } | |
611 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
ba7a46f1 JP |
612 | net_dbg_ratelimited("UDPLITE6: coverage %d too small, need min %d\n", |
613 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
ba4e58ec GR |
614 | goto drop; |
615 | } | |
1da177e4 LT |
616 | } |
617 | ||
4b943fae | 618 | prefetch(&sk->sk_rmem_alloc); |
ce25d66a ED |
619 | if (rcu_access_pointer(sk->sk_filter) && |
620 | udp_lib_checksum_complete(skb)) | |
621 | goto csum_error; | |
622 | ||
ba66bbe5 | 623 | if (sk_filter_trim_cap(sk, skb, sizeof(struct udphdr))) |
a6127697 | 624 | goto drop; |
ba4e58ec | 625 | |
e6afc8ac | 626 | udp_csum_pull_header(skb); |
cb80ef46 | 627 | |
d826eb14 | 628 | skb_dst_drop(skb); |
cb75994e | 629 | |
850cbadd | 630 | return __udpv6_queue_rcv_skb(sk, skb); |
3e215c8d | 631 | |
6a5dc9e5 | 632 | csum_error: |
02c22347 | 633 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_CSUMERRORS, is_udplite); |
ba4e58ec | 634 | drop: |
02c22347 | 635 | __UDP6_INC_STATS(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 636 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
637 | kfree_skb(skb); |
638 | return -1; | |
1da177e4 LT |
639 | } |
640 | ||
5cf3d461 DH |
641 | static bool __udp_v6_is_mcast_sock(struct net *net, struct sock *sk, |
642 | __be16 loc_port, const struct in6_addr *loc_addr, | |
643 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
644 | int dif, unsigned short hnum) | |
1da177e4 | 645 | { |
5cf3d461 | 646 | struct inet_sock *inet = inet_sk(sk); |
1da177e4 | 647 | |
5cf3d461 DH |
648 | if (!net_eq(sock_net(sk), net)) |
649 | return false; | |
650 | ||
651 | if (udp_sk(sk)->udp_port_hash != hnum || | |
652 | sk->sk_family != PF_INET6 || | |
653 | (inet->inet_dport && inet->inet_dport != rmt_port) || | |
654 | (!ipv6_addr_any(&sk->sk_v6_daddr) && | |
655 | !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) || | |
33b4b015 HR |
656 | (sk->sk_bound_dev_if && sk->sk_bound_dev_if != dif) || |
657 | (!ipv6_addr_any(&sk->sk_v6_rcv_saddr) && | |
658 | !ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr))) | |
5cf3d461 DH |
659 | return false; |
660 | if (!inet6_mc_check(sk, loc_addr, rmt_addr)) | |
661 | return false; | |
662 | return true; | |
1da177e4 LT |
663 | } |
664 | ||
4068579e TH |
665 | static void udp6_csum_zero_error(struct sk_buff *skb) |
666 | { | |
667 | /* RFC 2460 section 8.1 says that we SHOULD log | |
668 | * this error. Well, it is reasonable. | |
669 | */ | |
ba7a46f1 JP |
670 | net_dbg_ratelimited("IPv6: udp checksum is 0 for [%pI6c]:%u->[%pI6c]:%u\n", |
671 | &ipv6_hdr(skb)->saddr, ntohs(udp_hdr(skb)->source), | |
672 | &ipv6_hdr(skb)->daddr, ntohs(udp_hdr(skb)->dest)); | |
4068579e TH |
673 | } |
674 | ||
1da177e4 LT |
675 | /* |
676 | * Note: called only from the BH handler context, | |
677 | * so we don't need to lock the hashes. | |
678 | */ | |
e3163493 | 679 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 680 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
36cbb245 | 681 | struct udp_table *udptable, int proto) |
1da177e4 | 682 | { |
ca065d0c | 683 | struct sock *sk, *first = NULL; |
4bedb452 | 684 | const struct udphdr *uh = udp_hdr(skb); |
5cf3d461 DH |
685 | unsigned short hnum = ntohs(uh->dest); |
686 | struct udp_hslot *hslot = udp_hashslot(udptable, net, hnum); | |
ca065d0c | 687 | unsigned int offset = offsetof(typeof(*sk), sk_node); |
2dc41cff | 688 | unsigned int hash2 = 0, hash2_any = 0, use_hash2 = (hslot->count > 10); |
ca065d0c ED |
689 | int dif = inet6_iif(skb); |
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, | |
704 | uh->source, saddr, dif, hnum)) | |
705 | continue; | |
706 | /* If zero checksum and no_check is not on for | |
707 | * the socket then skip it. | |
708 | */ | |
709 | if (!uh->check && !udp_sk(sk)->no_check6_rx) | |
710 | continue; | |
711 | if (!first) { | |
712 | first = sk; | |
713 | continue; | |
714 | } | |
715 | nskb = skb_clone(skb, GFP_ATOMIC); | |
716 | if (unlikely(!nskb)) { | |
717 | atomic_inc(&sk->sk_drops); | |
02c22347 ED |
718 | __UDP6_INC_STATS(net, UDP_MIB_RCVBUFERRORS, |
719 | IS_UDPLITE(sk)); | |
720 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, | |
721 | IS_UDPLITE(sk)); | |
ca065d0c | 722 | continue; |
95766fff | 723 | } |
a1ab77f9 | 724 | |
ca065d0c ED |
725 | if (udpv6_queue_rcv_skb(sk, nskb) > 0) |
726 | consume_skb(nskb); | |
727 | } | |
a1ab77f9 | 728 | |
2dc41cff DH |
729 | /* Also lookup *:port if we are using hash2 and haven't done so yet. */ |
730 | if (use_hash2 && hash2 != hash2_any) { | |
731 | hash2 = hash2_any; | |
732 | goto start_lookup; | |
733 | } | |
734 | ||
ca065d0c ED |
735 | if (first) { |
736 | if (udpv6_queue_rcv_skb(first, skb) > 0) | |
737 | consume_skb(skb); | |
a1ab77f9 | 738 | } else { |
ca065d0c | 739 | kfree_skb(skb); |
02c22347 ED |
740 | __UDP6_INC_STATS(net, UDP_MIB_IGNOREDMULTI, |
741 | proto == IPPROTO_UDPLITE); | |
a1ab77f9 | 742 | } |
ba4e58ec | 743 | return 0; |
1da177e4 LT |
744 | } |
745 | ||
64f0f5d1 PA |
746 | static void udp6_sk_rx_dst_set(struct sock *sk, struct dst_entry *dst) |
747 | { | |
748 | if (udp_sk_rx_dst_set(sk, dst)) { | |
749 | const struct rt6_info *rt = (const struct rt6_info *)dst; | |
750 | ||
751 | inet6_sk(sk)->rx_dst_cookie = rt6_get_cookie(rt); | |
752 | } | |
753 | } | |
754 | ||
eb63f296 PA |
755 | /* wrapper for udp_queue_rcv_skb tacking care of csum conversion and |
756 | * return code conversion for ip layer consumption | |
757 | */ | |
758 | static int udp6_unicast_rcv_skb(struct sock *sk, struct sk_buff *skb, | |
759 | struct udphdr *uh) | |
760 | { | |
761 | int ret; | |
762 | ||
763 | if (inet_get_convert_csum(sk) && uh->check && !IS_UDPLITE(sk)) | |
764 | skb_checksum_try_convert(skb, IPPROTO_UDP, uh->check, | |
765 | ip6_compute_pseudo); | |
766 | ||
767 | ret = udpv6_queue_rcv_skb(sk, skb); | |
768 | ||
84dad559 | 769 | /* a return value > 0 means to resubmit the input */ |
eb63f296 | 770 | if (ret > 0) |
84dad559 | 771 | return ret; |
eb63f296 PA |
772 | return 0; |
773 | } | |
774 | ||
645ca708 | 775 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 776 | int proto) |
1da177e4 | 777 | { |
ca065d0c | 778 | const struct in6_addr *saddr, *daddr; |
3ffe533c | 779 | struct net *net = dev_net(skb->dev); |
1ab1457c | 780 | struct udphdr *uh; |
ca065d0c | 781 | struct sock *sk; |
1da177e4 LT |
782 | u32 ulen = 0; |
783 | ||
784 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 785 | goto discard; |
1da177e4 | 786 | |
0660e03f ACM |
787 | saddr = &ipv6_hdr(skb)->saddr; |
788 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 789 | uh = udp_hdr(skb); |
1da177e4 LT |
790 | |
791 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
792 | if (ulen > skb->len) |
793 | goto short_packet; | |
1da177e4 | 794 | |
759e5d00 HX |
795 | if (proto == IPPROTO_UDP) { |
796 | /* UDP validates ulen. */ | |
1da177e4 | 797 | |
ba4e58ec GR |
798 | /* Check for jumbo payload */ |
799 | if (ulen == 0) | |
800 | ulen = skb->len; | |
1da177e4 | 801 | |
ba4e58ec GR |
802 | if (ulen < sizeof(*uh)) |
803 | goto short_packet; | |
1da177e4 | 804 | |
ba4e58ec GR |
805 | if (ulen < skb->len) { |
806 | if (pskb_trim_rcsum(skb, ulen)) | |
807 | goto short_packet; | |
0660e03f ACM |
808 | saddr = &ipv6_hdr(skb)->saddr; |
809 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 810 | uh = udp_hdr(skb); |
ba4e58ec | 811 | } |
ba4e58ec | 812 | } |
1da177e4 | 813 | |
759e5d00 | 814 | if (udp6_csum_init(skb, uh, proto)) |
6a5dc9e5 | 815 | goto csum_error; |
759e5d00 | 816 | |
c9f2c1ae PA |
817 | /* Check if the socket is already available, e.g. due to early demux */ |
818 | sk = skb_steal_sock(skb); | |
819 | if (sk) { | |
820 | struct dst_entry *dst = skb_dst(skb); | |
821 | int ret; | |
822 | ||
823 | if (unlikely(sk->sk_rx_dst != dst)) | |
64f0f5d1 | 824 | udp6_sk_rx_dst_set(sk, dst); |
c9f2c1ae | 825 | |
eb63f296 PA |
826 | if (!uh->check && !udp_sk(sk)->no_check6_rx) { |
827 | sock_put(sk); | |
828 | goto report_csum_error; | |
829 | } | |
c9f2c1ae | 830 | |
eb63f296 PA |
831 | ret = udp6_unicast_rcv_skb(sk, skb, uh); |
832 | sock_put(sk); | |
833 | return ret; | |
c9f2c1ae PA |
834 | } |
835 | ||
1ab1457c YH |
836 | /* |
837 | * Multicast receive code | |
1da177e4 | 838 | */ |
ba4e58ec | 839 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 | 840 | return __udp6_lib_mcast_deliver(net, skb, |
36cbb245 | 841 | saddr, daddr, udptable, proto); |
1da177e4 LT |
842 | |
843 | /* Unicast */ | |
607c4aaf | 844 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
53b24b8f | 845 | if (sk) { |
eb63f296 PA |
846 | if (!uh->check && !udp_sk(sk)->no_check6_rx) |
847 | goto report_csum_error; | |
848 | return udp6_unicast_rcv_skb(sk, skb, uh); | |
1da177e4 | 849 | } |
1ab1457c | 850 | |
eb63f296 PA |
851 | if (!uh->check) |
852 | goto report_csum_error; | |
4068579e | 853 | |
cb80ef46 | 854 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 855 | goto discard; |
cb80ef46 BL |
856 | |
857 | if (udp_lib_checksum_complete(skb)) | |
6a5dc9e5 | 858 | goto csum_error; |
cb80ef46 | 859 | |
02c22347 | 860 | __UDP6_INC_STATS(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); |
cb80ef46 BL |
861 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); |
862 | ||
863 | kfree_skb(skb); | |
add459aa | 864 | return 0; |
1da177e4 | 865 | |
1ab1457c | 866 | short_packet: |
ba7a46f1 JP |
867 | net_dbg_ratelimited("UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
868 | proto == IPPROTO_UDPLITE ? "-Lite" : "", | |
869 | saddr, ntohs(uh->source), | |
870 | ulen, skb->len, | |
871 | daddr, ntohs(uh->dest)); | |
6a5dc9e5 | 872 | goto discard; |
eb63f296 PA |
873 | |
874 | report_csum_error: | |
875 | udp6_csum_zero_error(skb); | |
6a5dc9e5 | 876 | csum_error: |
02c22347 | 877 | __UDP6_INC_STATS(net, UDP_MIB_CSUMERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 878 | discard: |
02c22347 | 879 | __UDP6_INC_STATS(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 880 | kfree_skb(skb); |
add459aa | 881 | return 0; |
1da177e4 | 882 | } |
ba4e58ec | 883 | |
0bd84065 | 884 | |
5425077d | 885 | static struct sock *__udp6_lib_demux_lookup(struct net *net, |
886 | __be16 loc_port, const struct in6_addr *loc_addr, | |
887 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
4297a0ef | 888 | int dif, int sdif) |
5425077d | 889 | { |
0bd84065 | 890 | unsigned short hnum = ntohs(loc_port); |
f0b1e64c | 891 | unsigned int hash2 = ipv6_portaddr_hash(net, loc_addr, hnum); |
0bd84065 | 892 | unsigned int slot2 = hash2 & udp_table.mask; |
893 | struct udp_hslot *hslot2 = &udp_table.hash2[slot2]; | |
894 | const __portpair ports = INET_COMBINED_PORTS(rmt_port, hnum); | |
5425077d | 895 | struct sock *sk; |
896 | ||
0bd84065 | 897 | udp_portaddr_for_each_entry_rcu(sk, &hslot2->head) { |
85cb73ff | 898 | if (sk->sk_state == TCP_ESTABLISHED && |
4297a0ef | 899 | INET6_MATCH(sk, net, rmt_addr, loc_addr, ports, dif, sdif)) |
0bd84065 | 900 | return sk; |
901 | /* Only check first socket in chain */ | |
902 | break; | |
903 | } | |
904 | return NULL; | |
5425077d | 905 | } |
906 | ||
907 | static void udp_v6_early_demux(struct sk_buff *skb) | |
908 | { | |
909 | struct net *net = dev_net(skb->dev); | |
910 | const struct udphdr *uh; | |
911 | struct sock *sk; | |
912 | struct dst_entry *dst; | |
913 | int dif = skb->dev->ifindex; | |
4297a0ef | 914 | int sdif = inet6_sdif(skb); |
5425077d | 915 | |
916 | if (!pskb_may_pull(skb, skb_transport_offset(skb) + | |
917 | sizeof(struct udphdr))) | |
918 | return; | |
919 | ||
920 | uh = udp_hdr(skb); | |
921 | ||
922 | if (skb->pkt_type == PACKET_HOST) | |
923 | sk = __udp6_lib_demux_lookup(net, uh->dest, | |
924 | &ipv6_hdr(skb)->daddr, | |
925 | uh->source, &ipv6_hdr(skb)->saddr, | |
4297a0ef | 926 | dif, sdif); |
5425077d | 927 | else |
928 | return; | |
929 | ||
41c6d650 | 930 | if (!sk || !refcount_inc_not_zero(&sk->sk_refcnt)) |
5425077d | 931 | return; |
932 | ||
933 | skb->sk = sk; | |
934 | skb->destructor = sock_efree; | |
935 | dst = READ_ONCE(sk->sk_rx_dst); | |
936 | ||
937 | if (dst) | |
938 | dst = dst_check(dst, inet6_sk(sk)->rx_dst_cookie); | |
939 | if (dst) { | |
d24406c8 WW |
940 | /* set noref for now. |
941 | * any place which wants to hold dst has to call | |
942 | * dst_hold_safe() | |
943 | */ | |
944 | skb_dst_set_noref(skb, dst); | |
5425077d | 945 | } |
946 | } | |
947 | ||
e5bbef20 | 948 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 949 | { |
645ca708 | 950 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
951 | } |
952 | ||
1da177e4 LT |
953 | /* |
954 | * Throw away all pending data and cancel the corking. Socket is locked. | |
955 | */ | |
956 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
957 | { | |
958 | struct udp_sock *up = udp_sk(sk); | |
959 | ||
36d926b9 DL |
960 | if (up->pending == AF_INET) |
961 | udp_flush_pending_frames(sk); | |
962 | else if (up->pending) { | |
1da177e4 LT |
963 | up->len = 0; |
964 | up->pending = 0; | |
965 | ip6_flush_pending_frames(sk); | |
1ab1457c | 966 | } |
1da177e4 LT |
967 | } |
968 | ||
d74bad4e AI |
969 | static int udpv6_pre_connect(struct sock *sk, struct sockaddr *uaddr, |
970 | int addr_len) | |
971 | { | |
972 | /* The following checks are replicated from __ip6_datagram_connect() | |
973 | * and intended to prevent BPF program called below from accessing | |
974 | * bytes that are out of the bound specified by user in addr_len. | |
975 | */ | |
976 | if (uaddr->sa_family == AF_INET) { | |
977 | if (__ipv6_only_sock(sk)) | |
978 | return -EAFNOSUPPORT; | |
979 | return udp_pre_connect(sk, uaddr, addr_len); | |
980 | } | |
981 | ||
982 | if (addr_len < SIN6_LEN_RFC2133) | |
983 | return -EINVAL; | |
984 | ||
985 | return BPF_CGROUP_RUN_PROG_INET6_CONNECT_LOCK(sk, uaddr); | |
986 | } | |
987 | ||
493c6be3 | 988 | /** |
67ba4152 IM |
989 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming |
990 | * @sk: socket we are sending on | |
991 | * @skb: sk_buff containing the filled-in UDP header | |
992 | * (checksum field must be zeroed out) | |
493c6be3 SS |
993 | */ |
994 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
995 | const struct in6_addr *saddr, | |
996 | const struct in6_addr *daddr, int len) | |
997 | { | |
998 | unsigned int offset; | |
999 | struct udphdr *uh = udp_hdr(skb); | |
d39d938c | 1000 | struct sk_buff *frags = skb_shinfo(skb)->frag_list; |
493c6be3 SS |
1001 | __wsum csum = 0; |
1002 | ||
d39d938c | 1003 | if (!frags) { |
493c6be3 SS |
1004 | /* Only one fragment on the socket. */ |
1005 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1006 | skb->csum_offset = offsetof(struct udphdr, check); | |
1007 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
1008 | } else { | |
1009 | /* | |
1010 | * HW-checksum won't work as there are two or more | |
1011 | * fragments on the socket so that all csums of sk_buffs | |
1012 | * should be together | |
1013 | */ | |
1014 | offset = skb_transport_offset(skb); | |
1015 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
63ecc3d9 | 1016 | csum = skb->csum; |
493c6be3 SS |
1017 | |
1018 | skb->ip_summed = CHECKSUM_NONE; | |
1019 | ||
d39d938c VY |
1020 | do { |
1021 | csum = csum_add(csum, frags->csum); | |
1022 | } while ((frags = frags->next)); | |
493c6be3 SS |
1023 | |
1024 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
1025 | csum); | |
1026 | if (uh->check == 0) | |
1027 | uh->check = CSUM_MANGLED_0; | |
1028 | } | |
1029 | } | |
1030 | ||
1da177e4 LT |
1031 | /* |
1032 | * Sending | |
1033 | */ | |
1034 | ||
bec1f6f6 WB |
1035 | static int udp_v6_send_skb(struct sk_buff *skb, struct flowi6 *fl6, |
1036 | struct inet_cork *cork) | |
1da177e4 | 1037 | { |
d39d938c | 1038 | struct sock *sk = skb->sk; |
1da177e4 | 1039 | struct udphdr *uh; |
1da177e4 | 1040 | int err = 0; |
b2bf1e26 | 1041 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 1042 | __wsum csum = 0; |
d39d938c VY |
1043 | int offset = skb_transport_offset(skb); |
1044 | int len = skb->len - offset; | |
1da177e4 LT |
1045 | |
1046 | /* | |
1047 | * Create a UDP header | |
1048 | */ | |
4bedb452 | 1049 | uh = udp_hdr(skb); |
1958b856 DM |
1050 | uh->source = fl6->fl6_sport; |
1051 | uh->dest = fl6->fl6_dport; | |
d39d938c | 1052 | uh->len = htons(len); |
1da177e4 LT |
1053 | uh->check = 0; |
1054 | ||
bec1f6f6 WB |
1055 | if (cork->gso_size) { |
1056 | const int hlen = skb_network_header_len(skb) + | |
1057 | sizeof(struct udphdr); | |
1058 | ||
1059 | if (hlen + cork->gso_size > cork->fragsize) | |
1060 | return -EINVAL; | |
1061 | if (skb->len > cork->gso_size * UDP_MAX_SEGMENTS) | |
1062 | return -EINVAL; | |
a8c744a8 WB |
1063 | if (udp_sk(sk)->no_check6_tx) |
1064 | return -EINVAL; | |
ff06342c WB |
1065 | if (skb->ip_summed != CHECKSUM_PARTIAL || is_udplite || |
1066 | dst_xfrm(skb_dst(skb))) | |
bec1f6f6 WB |
1067 | return -EIO; |
1068 | ||
1069 | skb_shinfo(skb)->gso_size = cork->gso_size; | |
1070 | skb_shinfo(skb)->gso_type = SKB_GSO_UDP_L4; | |
a8c744a8 | 1071 | goto csum_partial; |
bec1f6f6 WB |
1072 | } |
1073 | ||
b2bf1e26 | 1074 | if (is_udplite) |
d39d938c VY |
1075 | csum = udplite_csum(skb); |
1076 | else if (udp_sk(sk)->no_check6_tx) { /* UDP csum disabled */ | |
4068579e TH |
1077 | skb->ip_summed = CHECKSUM_NONE; |
1078 | goto send; | |
1079 | } else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ | |
a8c744a8 | 1080 | csum_partial: |
d39d938c | 1081 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, len); |
493c6be3 SS |
1082 | goto send; |
1083 | } else | |
d39d938c | 1084 | csum = udp_csum(skb); |
1da177e4 | 1085 | |
ba4e58ec | 1086 | /* add protocol-dependent pseudo-header */ |
4c9483b2 | 1087 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
d39d938c | 1088 | len, fl6->flowi6_proto, csum); |
1da177e4 | 1089 | if (uh->check == 0) |
f6ab0288 | 1090 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 1091 | |
493c6be3 | 1092 | send: |
d39d938c | 1093 | err = ip6_send_skb(skb); |
6ce9e7b5 ED |
1094 | if (err) { |
1095 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
6aef70a8 ED |
1096 | UDP6_INC_STATS(sock_net(sk), |
1097 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
6ce9e7b5 ED |
1098 | err = 0; |
1099 | } | |
6aef70a8 ED |
1100 | } else { |
1101 | UDP6_INC_STATS(sock_net(sk), | |
1102 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1103 | } | |
d39d938c VY |
1104 | return err; |
1105 | } | |
1106 | ||
1107 | static int udp_v6_push_pending_frames(struct sock *sk) | |
1108 | { | |
1109 | struct sk_buff *skb; | |
1110 | struct udp_sock *up = udp_sk(sk); | |
1111 | struct flowi6 fl6; | |
1112 | int err = 0; | |
1113 | ||
1114 | if (up->pending == AF_INET) | |
1115 | return udp_push_pending_frames(sk); | |
1116 | ||
1117 | /* ip6_finish_skb will release the cork, so make a copy of | |
1118 | * fl6 here. | |
1119 | */ | |
1120 | fl6 = inet_sk(sk)->cork.fl.u.ip6; | |
1121 | ||
1122 | skb = ip6_finish_skb(sk); | |
1123 | if (!skb) | |
1124 | goto out; | |
1125 | ||
bec1f6f6 | 1126 | err = udp_v6_send_skb(skb, &fl6, &inet_sk(sk)->cork.base); |
d39d938c | 1127 | |
1da177e4 LT |
1128 | out: |
1129 | up->len = 0; | |
1130 | up->pending = 0; | |
1131 | return err; | |
1132 | } | |
1133 | ||
1b784140 | 1134 | int udpv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len) |
1da177e4 LT |
1135 | { |
1136 | struct ipv6_txoptions opt_space; | |
1137 | struct udp_sock *up = udp_sk(sk); | |
1138 | struct inet_sock *inet = inet_sk(sk); | |
1139 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342dfc30 | 1140 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name); |
20c59de2 | 1141 | struct in6_addr *daddr, *final_p, final; |
1da177e4 | 1142 | struct ipv6_txoptions *opt = NULL; |
45f6fad8 | 1143 | struct ipv6_txoptions *opt_to_free = NULL; |
1da177e4 | 1144 | struct ip6_flowlabel *flowlabel = NULL; |
4c9483b2 | 1145 | struct flowi6 fl6; |
1da177e4 | 1146 | struct dst_entry *dst; |
26879da5 | 1147 | struct ipcm6_cookie ipc6; |
1da177e4 | 1148 | int addr_len = msg->msg_namelen; |
9f542f61 | 1149 | bool connected = false; |
1da177e4 | 1150 | int ulen = len; |
1da177e4 LT |
1151 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1152 | int err; | |
b2bf1e26 | 1153 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1154 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 | 1155 | |
b515430a | 1156 | ipcm6_init(&ipc6); |
bec1f6f6 | 1157 | ipc6.gso_size = up->gso_size; |
5fdaa88d | 1158 | ipc6.sockc.tsflags = sk->sk_tsflags; |
26879da5 | 1159 | |
1da177e4 LT |
1160 | /* destination address check */ |
1161 | if (sin6) { | |
1162 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1163 | return -EINVAL; | |
1164 | ||
1165 | switch (sin6->sin6_family) { | |
1166 | case AF_INET6: | |
1167 | if (addr_len < SIN6_LEN_RFC2133) | |
1168 | return -EINVAL; | |
1169 | daddr = &sin6->sin6_addr; | |
052d2369 JL |
1170 | if (ipv6_addr_any(daddr) && |
1171 | ipv6_addr_v4mapped(&np->saddr)) | |
1172 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
1173 | daddr); | |
1da177e4 LT |
1174 | break; |
1175 | case AF_INET: | |
1176 | goto do_udp_sendmsg; | |
1177 | case AF_UNSPEC: | |
1178 | msg->msg_name = sin6 = NULL; | |
1179 | msg->msg_namelen = addr_len = 0; | |
1180 | daddr = NULL; | |
1181 | break; | |
1182 | default: | |
1183 | return -EINVAL; | |
1184 | } | |
1185 | } else if (!up->pending) { | |
1186 | if (sk->sk_state != TCP_ESTABLISHED) | |
1187 | return -EDESTADDRREQ; | |
efe4208f | 1188 | daddr = &sk->sk_v6_daddr; |
1ab1457c | 1189 | } else |
1da177e4 LT |
1190 | daddr = NULL; |
1191 | ||
1192 | if (daddr) { | |
e773e4fa | 1193 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1194 | struct sockaddr_in sin; |
1195 | sin.sin_family = AF_INET; | |
c720c7e8 | 1196 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1197 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1198 | msg->msg_name = &sin; | |
1199 | msg->msg_namelen = sizeof(sin); | |
1200 | do_udp_sendmsg: | |
1201 | if (__ipv6_only_sock(sk)) | |
1202 | return -ENETUNREACH; | |
1b784140 | 1203 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1204 | } |
1205 | } | |
1206 | ||
1207 | if (up->pending == AF_INET) | |
1b784140 | 1208 | return udp_sendmsg(sk, msg, len); |
1da177e4 LT |
1209 | |
1210 | /* Rough check on arithmetic overflow, | |
b59e139b | 1211 | better check is made in ip6_append_data(). |
1da177e4 LT |
1212 | */ |
1213 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1214 | return -EMSGSIZE; | |
1ab1457c | 1215 | |
03485f2a | 1216 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1da177e4 LT |
1217 | if (up->pending) { |
1218 | /* | |
1219 | * There are pending frames. | |
1220 | * The socket lock must be held while it's corked. | |
1221 | */ | |
1222 | lock_sock(sk); | |
1223 | if (likely(up->pending)) { | |
1224 | if (unlikely(up->pending != AF_INET6)) { | |
1225 | release_sock(sk); | |
1226 | return -EAFNOSUPPORT; | |
1227 | } | |
1228 | dst = NULL; | |
1229 | goto do_append_data; | |
1230 | } | |
1231 | release_sock(sk); | |
1232 | } | |
1233 | ulen += sizeof(struct udphdr); | |
1234 | ||
4c9483b2 | 1235 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1236 | |
1237 | if (sin6) { | |
1238 | if (sin6->sin6_port == 0) | |
1239 | return -EINVAL; | |
1240 | ||
1958b856 | 1241 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1242 | daddr = &sin6->sin6_addr; |
1243 | ||
1244 | if (np->sndflow) { | |
4c9483b2 DM |
1245 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1246 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1247 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1248 | if (!flowlabel) |
1da177e4 | 1249 | return -EINVAL; |
1da177e4 LT |
1250 | } |
1251 | } | |
1252 | ||
1253 | /* | |
1254 | * Otherwise it will be difficult to maintain | |
1255 | * sk->sk_dst_cache. | |
1256 | */ | |
1257 | if (sk->sk_state == TCP_ESTABLISHED && | |
efe4208f ED |
1258 | ipv6_addr_equal(daddr, &sk->sk_v6_daddr)) |
1259 | daddr = &sk->sk_v6_daddr; | |
1da177e4 LT |
1260 | |
1261 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1262 | sin6->sin6_scope_id && | |
842df073 | 1263 | __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr))) |
4c9483b2 | 1264 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1265 | } else { |
1266 | if (sk->sk_state != TCP_ESTABLISHED) | |
1267 | return -EDESTADDRREQ; | |
1268 | ||
1958b856 | 1269 | fl6.fl6_dport = inet->inet_dport; |
efe4208f | 1270 | daddr = &sk->sk_v6_daddr; |
4c9483b2 | 1271 | fl6.flowlabel = np->flow_label; |
9f542f61 | 1272 | connected = true; |
1da177e4 LT |
1273 | } |
1274 | ||
4c9483b2 DM |
1275 | if (!fl6.flowi6_oif) |
1276 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1277 | |
4c9483b2 DM |
1278 | if (!fl6.flowi6_oif) |
1279 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1280 | |
4c9483b2 | 1281 | fl6.flowi6_mark = sk->sk_mark; |
e2d118a1 | 1282 | fl6.flowi6_uid = sk->sk_uid; |
51953d5b | 1283 | |
1da177e4 LT |
1284 | if (msg->msg_controllen) { |
1285 | opt = &opt_space; | |
1286 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1287 | opt->tot_len = sizeof(*opt); | |
26879da5 | 1288 | ipc6.opt = opt; |
1da177e4 | 1289 | |
2e8de857 WB |
1290 | err = udp_cmsg_send(sk, msg, &ipc6.gso_size); |
1291 | if (err > 0) | |
1292 | err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, | |
5fdaa88d | 1293 | &ipc6); |
1da177e4 LT |
1294 | if (err < 0) { |
1295 | fl6_sock_release(flowlabel); | |
1296 | return err; | |
1297 | } | |
4c9483b2 DM |
1298 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1299 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 1300 | if (!flowlabel) |
1da177e4 LT |
1301 | return -EINVAL; |
1302 | } | |
1303 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1304 | opt = NULL; | |
9f542f61 | 1305 | connected = false; |
1da177e4 | 1306 | } |
45f6fad8 ED |
1307 | if (!opt) { |
1308 | opt = txopt_get(np); | |
1309 | opt_to_free = opt; | |
1310 | } | |
df9890c3 YH |
1311 | if (flowlabel) |
1312 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1313 | opt = ipv6_fixup_options(&opt_space, opt); | |
26879da5 | 1314 | ipc6.opt = opt; |
1da177e4 | 1315 | |
4c9483b2 | 1316 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1317 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1318 | fl6.daddr = *daddr; |
876c7f41 | 1319 | else |
4c9483b2 DM |
1320 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1321 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1322 | fl6.saddr = np->saddr; |
1958b856 | 1323 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1324 | |
1cedee13 AI |
1325 | if (cgroup_bpf_enabled && !connected) { |
1326 | err = BPF_CGROUP_RUN_PROG_UDP6_SENDMSG_LOCK(sk, | |
1327 | (struct sockaddr *)sin6, &fl6.saddr); | |
1328 | if (err) | |
1329 | goto out_no_dst; | |
1330 | if (sin6) { | |
1331 | if (ipv6_addr_v4mapped(&sin6->sin6_addr)) { | |
1332 | /* BPF program rewrote IPv6-only by IPv4-mapped | |
1333 | * IPv6. It's currently unsupported. | |
1334 | */ | |
1335 | err = -ENOTSUPP; | |
1336 | goto out_no_dst; | |
1337 | } | |
1338 | if (sin6->sin6_port == 0) { | |
1339 | /* BPF program set invalid port. Reject it. */ | |
1340 | err = -EINVAL; | |
1341 | goto out_no_dst; | |
1342 | } | |
1343 | fl6.fl6_dport = sin6->sin6_port; | |
1344 | fl6.daddr = sin6->sin6_addr; | |
1345 | } | |
1346 | } | |
1347 | ||
4c9483b2 | 1348 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1349 | if (final_p) |
9f542f61 | 1350 | connected = false; |
1da177e4 | 1351 | |
4c9483b2 DM |
1352 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1353 | fl6.flowi6_oif = np->mcast_oif; | |
9f542f61 | 1354 | connected = false; |
c4062dfc EH |
1355 | } else if (!fl6.flowi6_oif) |
1356 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1357 | |
4c9483b2 | 1358 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1359 | |
38b7097b HFS |
1360 | if (ipc6.tclass < 0) |
1361 | ipc6.tclass = np->tclass; | |
1362 | ||
1363 | fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel); | |
1364 | ||
4f858c56 | 1365 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, connected); |
68d0c6d3 DM |
1366 | if (IS_ERR(dst)) { |
1367 | err = PTR_ERR(dst); | |
1368 | dst = NULL; | |
1da177e4 | 1369 | goto out; |
14e50e57 | 1370 | } |
1da177e4 | 1371 | |
26879da5 WW |
1372 | if (ipc6.hlimit < 0) |
1373 | ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst); | |
1da177e4 LT |
1374 | |
1375 | if (msg->msg_flags&MSG_CONFIRM) | |
1376 | goto do_confirm; | |
1377 | back_from_confirm: | |
1378 | ||
03485f2a VY |
1379 | /* Lockless fast path for the non-corking case */ |
1380 | if (!corkreq) { | |
1cd7884d | 1381 | struct inet_cork_full cork; |
03485f2a VY |
1382 | struct sk_buff *skb; |
1383 | ||
1384 | skb = ip6_make_skb(sk, getfrag, msg, ulen, | |
26879da5 | 1385 | sizeof(struct udphdr), &ipc6, |
03485f2a | 1386 | &fl6, (struct rt6_info *)dst, |
5fdaa88d | 1387 | msg->msg_flags, &cork); |
03485f2a VY |
1388 | err = PTR_ERR(skb); |
1389 | if (!IS_ERR_OR_NULL(skb)) | |
bec1f6f6 | 1390 | err = udp_v6_send_skb(skb, &fl6, &cork.base); |
4f858c56 | 1391 | goto out; |
03485f2a VY |
1392 | } |
1393 | ||
1da177e4 LT |
1394 | lock_sock(sk); |
1395 | if (unlikely(up->pending)) { | |
1396 | /* The socket is already corked while preparing it. */ | |
1397 | /* ... which is an evident application bug. --ANK */ | |
1398 | release_sock(sk); | |
1399 | ||
ba7a46f1 | 1400 | net_dbg_ratelimited("udp cork app bug 2\n"); |
1da177e4 LT |
1401 | err = -EINVAL; |
1402 | goto out; | |
1403 | } | |
1404 | ||
1405 | up->pending = AF_INET6; | |
1406 | ||
1407 | do_append_data: | |
26879da5 WW |
1408 | if (ipc6.dontfrag < 0) |
1409 | ipc6.dontfrag = np->dontfrag; | |
1da177e4 | 1410 | up->len += ulen; |
26879da5 WW |
1411 | err = ip6_append_data(sk, getfrag, msg, ulen, sizeof(struct udphdr), |
1412 | &ipc6, &fl6, (struct rt6_info *)dst, | |
5fdaa88d | 1413 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); |
1da177e4 LT |
1414 | if (err) |
1415 | udp_v6_flush_pending_frames(sk); | |
1416 | else if (!corkreq) | |
4c0a6cb0 | 1417 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1418 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1419 | up->pending = 0; | |
1da177e4 | 1420 | |
03485f2a VY |
1421 | if (err > 0) |
1422 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1423 | release_sock(sk); | |
1424 | ||
1da177e4 | 1425 | out: |
a3c96089 | 1426 | dst_release(dst); |
1cedee13 | 1427 | out_no_dst: |
1da177e4 | 1428 | fl6_sock_release(flowlabel); |
45f6fad8 | 1429 | txopt_put(opt_to_free); |
cd562c98 | 1430 | if (!err) |
1da177e4 | 1431 | return len; |
a18135eb DM |
1432 | /* |
1433 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1434 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1435 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1436 | * things). We could add another new stat but at least for now that | |
1437 | * seems like overkill. | |
1438 | */ | |
1439 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
6aef70a8 ED |
1440 | UDP6_INC_STATS(sock_net(sk), |
1441 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1442 | } |
1da177e4 LT |
1443 | return err; |
1444 | ||
1445 | do_confirm: | |
0dec879f JA |
1446 | if (msg->msg_flags & MSG_PROBE) |
1447 | dst_confirm_neigh(dst, &fl6.daddr); | |
1da177e4 LT |
1448 | if (!(msg->msg_flags&MSG_PROBE) || len) |
1449 | goto back_from_confirm; | |
1450 | err = 0; | |
1451 | goto out; | |
1452 | } | |
1453 | ||
7d06b2e0 | 1454 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 | 1455 | { |
44046a59 | 1456 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
1457 | lock_sock(sk); |
1458 | udp_v6_flush_pending_frames(sk); | |
1459 | release_sock(sk); | |
1460 | ||
88ab3108 | 1461 | if (static_branch_unlikely(&udpv6_encap_needed_key) && up->encap_type) { |
44046a59 | 1462 | void (*encap_destroy)(struct sock *sk); |
6aa7de05 | 1463 | encap_destroy = READ_ONCE(up->encap_destroy); |
44046a59 TP |
1464 | if (encap_destroy) |
1465 | encap_destroy(sk); | |
1466 | } | |
1467 | ||
1da177e4 | 1468 | inet6_destroy_sock(sk); |
1da177e4 LT |
1469 | } |
1470 | ||
1471 | /* | |
1472 | * Socket option code for UDP | |
1473 | */ | |
ba4e58ec | 1474 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1475 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1476 | { |
db8dac20 | 1477 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1478 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1479 | udp_v6_push_pending_frames); | |
ba4e58ec | 1480 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1481 | } |
1482 | ||
1483 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1484 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1485 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1486 | { |
db8dac20 | 1487 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1488 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1489 | udp_v6_push_pending_frames); | |
ba4e58ec | 1490 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1491 | } |
1492 | #endif | |
1493 | ||
ba4e58ec GR |
1494 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1495 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1496 | { |
db8dac20 | 1497 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1498 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1499 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1500 | } |
1501 | ||
1502 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1503 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1504 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1505 | { |
db8dac20 | 1506 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1507 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1508 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1509 | } |
1510 | #endif | |
1511 | ||
a8e3bb34 DA |
1512 | /* thinking of making this const? Don't. |
1513 | * early_demux can change based on sysctl. | |
1514 | */ | |
dddb64bc | 1515 | static struct inet6_protocol udpv6_protocol = { |
5425077d | 1516 | .early_demux = udp_v6_early_demux, |
dddb64bc | 1517 | .early_demux_handler = udp_v6_early_demux, |
1da177e4 LT |
1518 | .handler = udpv6_rcv, |
1519 | .err_handler = udpv6_err, | |
1520 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1521 | }; | |
1522 | ||
1523 | /* ------------------------------------------------------------------------ */ | |
1524 | #ifdef CONFIG_PROC_FS | |
ba4e58ec | 1525 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 | 1526 | { |
17ef66af LC |
1527 | if (v == SEQ_START_TOKEN) { |
1528 | seq_puts(seq, IPV6_SEQ_DGRAM_HEADER); | |
1529 | } else { | |
1530 | int bucket = ((struct udp_iter_state *)seq->private)->bucket; | |
1531 | struct inet_sock *inet = inet_sk(v); | |
1532 | __u16 srcp = ntohs(inet->inet_sport); | |
1533 | __u16 destp = ntohs(inet->inet_dport); | |
6c206b20 PA |
1534 | __ip6_dgram_sock_seq_show(seq, v, srcp, destp, |
1535 | udp_rqueue_get(v), bucket); | |
17ef66af | 1536 | } |
1da177e4 LT |
1537 | return 0; |
1538 | } | |
1539 | ||
c3506372 | 1540 | const struct seq_operations udp6_seq_ops = { |
a3d2599b CH |
1541 | .start = udp_seq_start, |
1542 | .next = udp_seq_next, | |
1543 | .stop = udp_seq_stop, | |
1544 | .show = udp6_seq_show, | |
1545 | }; | |
c3506372 | 1546 | EXPORT_SYMBOL(udp6_seq_ops); |
73cb88ec | 1547 | |
1da177e4 | 1548 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 | 1549 | .family = AF_INET6, |
645ca708 | 1550 | .udp_table = &udp_table, |
1da177e4 LT |
1551 | }; |
1552 | ||
2c8c1e72 | 1553 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1554 | { |
c3506372 CH |
1555 | if (!proc_create_net_data("udp6", 0444, net->proc_net, &udp6_seq_ops, |
1556 | sizeof(struct udp_iter_state), &udp6_seq_afinfo)) | |
a3d2599b CH |
1557 | return -ENOMEM; |
1558 | return 0; | |
1da177e4 LT |
1559 | } |
1560 | ||
ec120da6 IM |
1561 | void udp6_proc_exit(struct net *net) |
1562 | { | |
a3d2599b | 1563 | remove_proc_entry("udp6", net->proc_net); |
1da177e4 LT |
1564 | } |
1565 | #endif /* CONFIG_PROC_FS */ | |
1566 | ||
1567 | /* ------------------------------------------------------------------------ */ | |
1568 | ||
1569 | struct proto udpv6_prot = { | |
1e802951 TZ |
1570 | .name = "UDPv6", |
1571 | .owner = THIS_MODULE, | |
1572 | .close = udp_lib_close, | |
d74bad4e | 1573 | .pre_connect = udpv6_pre_connect, |
1e802951 TZ |
1574 | .connect = ip6_datagram_connect, |
1575 | .disconnect = udp_disconnect, | |
1576 | .ioctl = udp_ioctl, | |
1577 | .init = udp_init_sock, | |
1578 | .destroy = udpv6_destroy_sock, | |
1579 | .setsockopt = udpv6_setsockopt, | |
1580 | .getsockopt = udpv6_getsockopt, | |
1581 | .sendmsg = udpv6_sendmsg, | |
1582 | .recvmsg = udpv6_recvmsg, | |
1583 | .release_cb = ip6_datagram_release_cb, | |
1584 | .hash = udp_lib_hash, | |
1585 | .unhash = udp_lib_unhash, | |
1586 | .rehash = udp_v6_rehash, | |
1587 | .get_port = udp_v6_get_port, | |
1588 | .memory_allocated = &udp_memory_allocated, | |
1589 | .sysctl_mem = sysctl_udp_mem, | |
1590 | .sysctl_wmem_offset = offsetof(struct net, ipv4.sysctl_udp_wmem_min), | |
1591 | .sysctl_rmem_offset = offsetof(struct net, ipv4.sysctl_udp_rmem_min), | |
1592 | .obj_size = sizeof(struct udp6_sock), | |
1593 | .h.udp_table = &udp_table, | |
3fdadf7d | 1594 | #ifdef CONFIG_COMPAT |
1e802951 TZ |
1595 | .compat_setsockopt = compat_udpv6_setsockopt, |
1596 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1597 | #endif |
1e802951 | 1598 | .diag_destroy = udp_abort, |
1da177e4 LT |
1599 | }; |
1600 | ||
1da177e4 LT |
1601 | static struct inet_protosw udpv6_protosw = { |
1602 | .type = SOCK_DGRAM, | |
1603 | .protocol = IPPROTO_UDP, | |
1604 | .prot = &udpv6_prot, | |
1605 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1606 | .flags = INET_PROTOSW_PERMANENT, |
1607 | }; | |
1608 | ||
7f4e4868 | 1609 | int __init udpv6_init(void) |
1da177e4 | 1610 | { |
7f4e4868 DL |
1611 | int ret; |
1612 | ||
3336288a VY |
1613 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1614 | if (ret) | |
c6b641a4 | 1615 | goto out; |
3336288a | 1616 | |
7f4e4868 DL |
1617 | ret = inet6_register_protosw(&udpv6_protosw); |
1618 | if (ret) | |
1619 | goto out_udpv6_protocol; | |
1620 | out: | |
1621 | return ret; | |
1622 | ||
1623 | out_udpv6_protocol: | |
1624 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1625 | goto out; | |
1626 | } | |
1627 | ||
09f7709f | 1628 | void udpv6_exit(void) |
7f4e4868 DL |
1629 | { |
1630 | inet6_unregister_protosw(&udpv6_protosw); | |
1631 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1632 | } |