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> |
1da177e4 LT |
37 | #include <asm/uaccess.h> |
38 | ||
1da177e4 LT |
39 | #include <net/ndisc.h> |
40 | #include <net/protocol.h> | |
41 | #include <net/transp_v6.h> | |
42 | #include <net/ip6_route.h> | |
1da177e4 | 43 | #include <net/raw.h> |
c752f073 | 44 | #include <net/tcp_states.h> |
1da177e4 LT |
45 | #include <net/ip6_checksum.h> |
46 | #include <net/xfrm.h> | |
47 | ||
48 | #include <linux/proc_fs.h> | |
49 | #include <linux/seq_file.h> | |
ba4e58ec | 50 | #include "udp_impl.h" |
1da177e4 | 51 | |
b2f5e7cd VY |
52 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
53 | { | |
54 | const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; | |
55 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); | |
c720c7e8 | 56 | __be32 sk1_rcv_saddr = inet_sk(sk)->inet_rcv_saddr; |
499923c7 | 57 | __be32 sk2_rcv_saddr = inet_rcv_saddr(sk2); |
b2f5e7cd VY |
58 | int sk_ipv6only = ipv6_only_sock(sk); |
59 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
60 | int addr_type = ipv6_addr_type(sk_rcv_saddr6); | |
61 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; | |
62 | ||
63 | /* if both are mapped, treat as IPv4 */ | |
64 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 | 65 | return (!sk2_ipv6only && |
c720c7e8 ED |
66 | (!sk1_rcv_saddr || !sk2_rcv_saddr || |
67 | sk1_rcv_saddr == sk2_rcv_saddr)); | |
b2f5e7cd VY |
68 | |
69 | if (addr_type2 == IPV6_ADDR_ANY && | |
70 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
71 | return 1; | |
72 | ||
73 | if (addr_type == IPV6_ADDR_ANY && | |
74 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) | |
75 | return 1; | |
76 | ||
77 | if (sk2_rcv_saddr6 && | |
78 | ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) | |
79 | return 1; | |
80 | ||
81 | return 0; | |
82 | } | |
83 | ||
d4cada4a ED |
84 | static unsigned int udp6_portaddr_hash(struct net *net, |
85 | const struct in6_addr *addr6, | |
86 | unsigned int port) | |
87 | { | |
88 | unsigned int hash, mix = net_hash_mix(net); | |
89 | ||
90 | if (ipv6_addr_any(addr6)) | |
91 | hash = jhash_1word(0, mix); | |
92 | else if (ipv6_addr_type(addr6) == IPV6_ADDR_MAPPED) | |
93 | hash = jhash_1word(addr6->s6_addr32[3], mix); | |
94 | else | |
95 | hash = jhash2(addr6->s6_addr32, 4, mix); | |
96 | ||
97 | return hash ^ port; | |
98 | } | |
99 | ||
100 | ||
6ba5a3c5 | 101 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 102 | { |
d4cada4a ED |
103 | /* precompute partial secondary hash */ |
104 | udp_sk(sk)->udp_portaddr_hash = | |
105 | udp6_portaddr_hash(sock_net(sk), | |
106 | &inet6_sk(sk)->rcv_saddr, | |
107 | 0); | |
6ba5a3c5 | 108 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal); |
1da177e4 LT |
109 | } |
110 | ||
645ca708 ED |
111 | static inline int compute_score(struct sock *sk, struct net *net, |
112 | unsigned short hnum, | |
113 | struct in6_addr *saddr, __be16 sport, | |
114 | struct in6_addr *daddr, __be16 dport, | |
115 | int dif) | |
116 | { | |
117 | int score = -1; | |
118 | ||
d4cada4a | 119 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
120 | sk->sk_family == PF_INET6) { |
121 | struct ipv6_pinfo *np = inet6_sk(sk); | |
122 | struct inet_sock *inet = inet_sk(sk); | |
123 | ||
124 | score = 0; | |
c720c7e8 ED |
125 | if (inet->inet_dport) { |
126 | if (inet->inet_dport != sport) | |
645ca708 ED |
127 | return -1; |
128 | score++; | |
129 | } | |
130 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
131 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
132 | return -1; | |
133 | score++; | |
134 | } | |
135 | if (!ipv6_addr_any(&np->daddr)) { | |
136 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
137 | return -1; | |
138 | score++; | |
139 | } | |
140 | if (sk->sk_bound_dev_if) { | |
141 | if (sk->sk_bound_dev_if != dif) | |
142 | return -1; | |
143 | score++; | |
144 | } | |
145 | } | |
146 | return score; | |
147 | } | |
148 | ||
fa4d3c62 PE |
149 | static struct sock *__udp6_lib_lookup(struct net *net, |
150 | struct in6_addr *saddr, __be16 sport, | |
ba4e58ec | 151 | struct in6_addr *daddr, __be16 dport, |
645ca708 | 152 | int dif, struct udp_table *udptable) |
1da177e4 | 153 | { |
271b72c7 | 154 | struct sock *sk, *result; |
88ab1932 | 155 | struct hlist_nulls_node *node; |
1da177e4 | 156 | unsigned short hnum = ntohs(dport); |
f86dcc5a | 157 | unsigned int hash = udp_hashfn(net, hnum, udptable->mask); |
645ca708 | 158 | struct udp_hslot *hslot = &udptable->hash[hash]; |
271b72c7 | 159 | int score, badness; |
645ca708 | 160 | |
271b72c7 ED |
161 | rcu_read_lock(); |
162 | begin: | |
163 | result = NULL; | |
164 | badness = -1; | |
88ab1932 | 165 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
166 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
167 | if (score > badness) { | |
168 | result = sk; | |
169 | badness = score; | |
1da177e4 LT |
170 | } |
171 | } | |
88ab1932 ED |
172 | /* |
173 | * if the nulls value we got at the end of this lookup is | |
174 | * not the expected one, we must restart lookup. | |
175 | * We probably met an item that was moved to another chain. | |
176 | */ | |
177 | if (get_nulls_value(node) != hash) | |
178 | goto begin; | |
179 | ||
271b72c7 ED |
180 | if (result) { |
181 | if (unlikely(!atomic_inc_not_zero(&result->sk_refcnt))) | |
182 | result = NULL; | |
183 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
184 | daddr, dport, dif) < badness)) { | |
185 | sock_put(result); | |
186 | goto begin; | |
187 | } | |
188 | } | |
189 | rcu_read_unlock(); | |
1da177e4 LT |
190 | return result; |
191 | } | |
192 | ||
607c4aaf KK |
193 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
194 | __be16 sport, __be16 dport, | |
645ca708 | 195 | struct udp_table *udptable) |
607c4aaf | 196 | { |
23542618 | 197 | struct sock *sk; |
607c4aaf KK |
198 | struct ipv6hdr *iph = ipv6_hdr(skb); |
199 | ||
23542618 KK |
200 | if (unlikely(sk = skb_steal_sock(skb))) |
201 | return sk; | |
adf30907 ED |
202 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
203 | &iph->daddr, dport, inet6_iif(skb), | |
204 | udptable); | |
607c4aaf KK |
205 | } |
206 | ||
1da177e4 LT |
207 | /* |
208 | * This should be easy, if there is something there we | |
209 | * return it, otherwise we block. | |
210 | */ | |
211 | ||
ba4e58ec | 212 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
213 | struct msghdr *msg, size_t len, |
214 | int noblock, int flags, int *addr_len) | |
215 | { | |
216 | struct ipv6_pinfo *np = inet6_sk(sk); | |
217 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 218 | struct sk_buff *skb; |
759e5d00 | 219 | unsigned int ulen, copied; |
a59322be | 220 | int peeked; |
759e5d00 HX |
221 | int err; |
222 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 223 | int is_udp4; |
1da177e4 | 224 | |
1ab1457c YH |
225 | if (addr_len) |
226 | *addr_len=sizeof(struct sockaddr_in6); | |
227 | ||
1da177e4 LT |
228 | if (flags & MSG_ERRQUEUE) |
229 | return ipv6_recv_error(sk, msg, len); | |
230 | ||
231 | try_again: | |
a59322be HX |
232 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
233 | &peeked, &err); | |
1da177e4 LT |
234 | if (!skb) |
235 | goto out; | |
236 | ||
759e5d00 HX |
237 | ulen = skb->len - sizeof(struct udphdr); |
238 | copied = len; | |
239 | if (copied > ulen) | |
240 | copied = ulen; | |
241 | else if (copied < ulen) | |
1ab1457c | 242 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 243 | |
f26ba175 WY |
244 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
245 | ||
ba4e58ec | 246 | /* |
759e5d00 HX |
247 | * If checksum is needed at all, try to do it while copying the |
248 | * data. If the data is truncated, or if we only want a partial | |
249 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 250 | */ |
ba4e58ec | 251 | |
759e5d00 HX |
252 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
253 | if (udp_lib_checksum_complete(skb)) | |
1da177e4 | 254 | goto csum_copy_err; |
ba4e58ec GR |
255 | } |
256 | ||
60476372 | 257 | if (skb_csum_unnecessary(skb)) |
ba4e58ec GR |
258 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
259 | msg->msg_iov, copied ); | |
260 | else { | |
1da177e4 LT |
261 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
262 | if (err == -EINVAL) | |
263 | goto csum_copy_err; | |
264 | } | |
265 | if (err) | |
266 | goto out_free; | |
267 | ||
f26ba175 WY |
268 | if (!peeked) { |
269 | if (is_udp4) | |
270 | UDP_INC_STATS_USER(sock_net(sk), | |
271 | UDP_MIB_INDATAGRAMS, is_udplite); | |
272 | else | |
273 | UDP6_INC_STATS_USER(sock_net(sk), | |
274 | UDP_MIB_INDATAGRAMS, is_udplite); | |
275 | } | |
cb75994e | 276 | |
3b885787 | 277 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
278 | |
279 | /* Copy the address. */ | |
280 | if (msg->msg_name) { | |
281 | struct sockaddr_in6 *sin6; | |
1ab1457c | 282 | |
1da177e4 LT |
283 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
284 | sin6->sin6_family = AF_INET6; | |
4bedb452 | 285 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 LT |
286 | sin6->sin6_flowinfo = 0; |
287 | sin6->sin6_scope_id = 0; | |
288 | ||
f26ba175 | 289 | if (is_udp4) |
b301e82c BH |
290 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
291 | &sin6->sin6_addr); | |
1da177e4 | 292 | else { |
0660e03f ACM |
293 | ipv6_addr_copy(&sin6->sin6_addr, |
294 | &ipv6_hdr(skb)->saddr); | |
1da177e4 LT |
295 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
296 | sin6->sin6_scope_id = IP6CB(skb)->iif; | |
297 | } | |
298 | ||
299 | } | |
f26ba175 | 300 | if (is_udp4) { |
1da177e4 LT |
301 | if (inet->cmsg_flags) |
302 | ip_cmsg_recv(msg, skb); | |
303 | } else { | |
304 | if (np->rxopt.all) | |
305 | datagram_recv_ctl(sk, msg, skb); | |
1ab1457c | 306 | } |
1da177e4 LT |
307 | |
308 | err = copied; | |
309 | if (flags & MSG_TRUNC) | |
759e5d00 | 310 | err = ulen; |
1da177e4 LT |
311 | |
312 | out_free: | |
9d410c79 | 313 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
314 | out: |
315 | return err; | |
316 | ||
317 | csum_copy_err: | |
95766fff | 318 | lock_sock(sk); |
0856f939 WY |
319 | if (!skb_kill_datagram(sk, skb, flags)) { |
320 | if (is_udp4) | |
321 | UDP_INC_STATS_USER(sock_net(sk), | |
322 | UDP_MIB_INERRORS, is_udplite); | |
323 | else | |
324 | UDP6_INC_STATS_USER(sock_net(sk), | |
325 | UDP_MIB_INERRORS, is_udplite); | |
326 | } | |
95766fff | 327 | release_sock(sk); |
1da177e4 | 328 | |
7a0ff716 | 329 | if (flags & MSG_DONTWAIT) |
1da177e4 | 330 | return -EAGAIN; |
1da177e4 LT |
331 | goto try_again; |
332 | } | |
333 | ||
ba4e58ec | 334 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 335 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 336 | struct udp_table *udptable) |
1da177e4 LT |
337 | { |
338 | struct ipv6_pinfo *np; | |
339 | struct ipv6hdr *hdr = (struct ipv6hdr*)skb->data; | |
1da177e4 LT |
340 | struct in6_addr *saddr = &hdr->saddr; |
341 | struct in6_addr *daddr = &hdr->daddr; | |
342 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); | |
343 | struct sock *sk; | |
344 | int err; | |
345 | ||
c346dca1 | 346 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 347 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
348 | if (sk == NULL) |
349 | return; | |
350 | ||
351 | np = inet6_sk(sk); | |
352 | ||
353 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
354 | goto out; | |
355 | ||
356 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
357 | goto out; | |
358 | ||
359 | if (np->recverr) | |
360 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); | |
361 | ||
362 | sk->sk_err = err; | |
363 | sk->sk_error_report(sk); | |
364 | out: | |
365 | sock_put(sk); | |
366 | } | |
367 | ||
ba4e58ec | 368 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba BH |
369 | struct inet6_skb_parm *opt, u8 type, |
370 | u8 code, int offset, __be32 info ) | |
ba4e58ec | 371 | { |
645ca708 | 372 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
373 | } |
374 | ||
375 | int udpv6_queue_rcv_skb(struct sock * sk, struct sk_buff *skb) | |
1da177e4 | 376 | { |
ba4e58ec | 377 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 378 | int rc; |
b2bf1e26 | 379 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 380 | |
ba4e58ec GR |
381 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
382 | goto drop; | |
1da177e4 | 383 | |
ba4e58ec GR |
384 | /* |
385 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
386 | */ | |
b2bf1e26 | 387 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
388 | |
389 | if (up->pcrlen == 0) { /* full coverage was set */ | |
390 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
391 | " %d while full coverage %d requested\n", | |
392 | UDP_SKB_CB(skb)->cscov, skb->len); | |
393 | goto drop; | |
394 | } | |
395 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
396 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
397 | "too small, need min %d\n", | |
398 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
399 | goto drop; | |
400 | } | |
1da177e4 LT |
401 | } |
402 | ||
1ab6eb62 HX |
403 | if (sk->sk_filter) { |
404 | if (udp_lib_checksum_complete(skb)) | |
405 | goto drop; | |
406 | } | |
ba4e58ec | 407 | |
766e9037 | 408 | if ((rc = sock_queue_rcv_skb(sk, skb)) < 0) { |
a18135eb | 409 | /* Note that an ENOMEM error is charged twice */ |
766e9037 | 410 | if (rc == -ENOMEM) |
ef28d1a2 PE |
411 | UDP6_INC_STATS_BH(sock_net(sk), |
412 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
8edf19c2 | 413 | goto drop_no_sk_drops_inc; |
1da177e4 | 414 | } |
cb75994e | 415 | |
1da177e4 | 416 | return 0; |
ba4e58ec | 417 | drop: |
8edf19c2 ED |
418 | atomic_inc(&sk->sk_drops); |
419 | drop_no_sk_drops_inc: | |
ef28d1a2 | 420 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
ba4e58ec GR |
421 | kfree_skb(skb); |
422 | return -1; | |
1da177e4 LT |
423 | } |
424 | ||
920a4611 | 425 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
e69a4adc AV |
426 | __be16 loc_port, struct in6_addr *loc_addr, |
427 | __be16 rmt_port, struct in6_addr *rmt_addr, | |
1da177e4 LT |
428 | int dif) |
429 | { | |
88ab1932 | 430 | struct hlist_nulls_node *node; |
1da177e4 LT |
431 | struct sock *s = sk; |
432 | unsigned short num = ntohs(loc_port); | |
433 | ||
88ab1932 | 434 | sk_nulls_for_each_from(s, node) { |
1da177e4 LT |
435 | struct inet_sock *inet = inet_sk(s); |
436 | ||
920a4611 | 437 | if (!net_eq(sock_net(s), net)) |
b8ad0cbc DL |
438 | continue; |
439 | ||
d4cada4a ED |
440 | if (udp_sk(s)->udp_port_hash == num && |
441 | s->sk_family == PF_INET6) { | |
1da177e4 | 442 | struct ipv6_pinfo *np = inet6_sk(s); |
c720c7e8 ED |
443 | if (inet->inet_dport) { |
444 | if (inet->inet_dport != rmt_port) | |
1da177e4 LT |
445 | continue; |
446 | } | |
447 | if (!ipv6_addr_any(&np->daddr) && | |
448 | !ipv6_addr_equal(&np->daddr, rmt_addr)) | |
449 | continue; | |
450 | ||
451 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) | |
452 | continue; | |
453 | ||
454 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
40796c5e DS |
455 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
456 | continue; | |
1da177e4 | 457 | } |
add459aa | 458 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
1da177e4 LT |
459 | continue; |
460 | return s; | |
461 | } | |
462 | } | |
463 | return NULL; | |
464 | } | |
465 | ||
466 | /* | |
467 | * Note: called only from the BH handler context, | |
468 | * so we don't need to lock the hashes. | |
469 | */ | |
e3163493 PE |
470 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
471 | struct in6_addr *saddr, struct in6_addr *daddr, | |
645ca708 | 472 | struct udp_table *udptable) |
1da177e4 LT |
473 | { |
474 | struct sock *sk, *sk2; | |
4bedb452 | 475 | const struct udphdr *uh = udp_hdr(skb); |
f86dcc5a | 476 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
1da177e4 LT |
477 | int dif; |
478 | ||
645ca708 | 479 | spin_lock(&hslot->lock); |
88ab1932 | 480 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 481 | dif = inet6_iif(skb); |
920a4611 | 482 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
1da177e4 LT |
483 | if (!sk) { |
484 | kfree_skb(skb); | |
485 | goto out; | |
486 | } | |
487 | ||
488 | sk2 = sk; | |
88ab1932 | 489 | while ((sk2 = udp_v6_mcast_next(net, sk_nulls_next(sk2), uh->dest, daddr, |
1da177e4 LT |
490 | uh->source, saddr, dif))) { |
491 | struct sk_buff *buff = skb_clone(skb, GFP_ATOMIC); | |
95766fff | 492 | if (buff) { |
d97106ea | 493 | bh_lock_sock(sk2); |
95766fff HA |
494 | if (!sock_owned_by_user(sk2)) |
495 | udpv6_queue_rcv_skb(sk2, buff); | |
496 | else | |
497 | sk_add_backlog(sk2, buff); | |
498 | bh_unlock_sock(sk2); | |
499 | } | |
1da177e4 | 500 | } |
d97106ea | 501 | bh_lock_sock(sk); |
95766fff HA |
502 | if (!sock_owned_by_user(sk)) |
503 | udpv6_queue_rcv_skb(sk, skb); | |
504 | else | |
505 | sk_add_backlog(sk, skb); | |
506 | bh_unlock_sock(sk); | |
1da177e4 | 507 | out: |
645ca708 | 508 | spin_unlock(&hslot->lock); |
ba4e58ec | 509 | return 0; |
1da177e4 LT |
510 | } |
511 | ||
759e5d00 HX |
512 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
513 | int proto) | |
ba4e58ec | 514 | { |
759e5d00 HX |
515 | int err; |
516 | ||
517 | UDP_SKB_CB(skb)->partial_cov = 0; | |
518 | UDP_SKB_CB(skb)->cscov = skb->len; | |
519 | ||
db8dac20 | 520 | if (proto == IPPROTO_UDPLITE) { |
759e5d00 HX |
521 | err = udplite_checksum_init(skb, uh); |
522 | if (err) | |
523 | return err; | |
524 | } | |
525 | ||
ba4e58ec GR |
526 | if (uh->check == 0) { |
527 | /* RFC 2460 section 8.1 says that we SHOULD log | |
528 | this error. Well, it is reasonable. | |
529 | */ | |
530 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
531 | return 1; | |
532 | } | |
533 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
0660e03f | 534 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
759e5d00 | 535 | skb->len, proto, skb->csum)) |
ba4e58ec GR |
536 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
537 | ||
60476372 | 538 | if (!skb_csum_unnecessary(skb)) |
0660e03f ACM |
539 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
540 | &ipv6_hdr(skb)->daddr, | |
759e5d00 | 541 | skb->len, proto, 0)); |
ba4e58ec | 542 | |
759e5d00 | 543 | return 0; |
ba4e58ec GR |
544 | } |
545 | ||
645ca708 | 546 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 547 | int proto) |
1da177e4 | 548 | { |
1da177e4 | 549 | struct sock *sk; |
1ab1457c | 550 | struct udphdr *uh; |
1da177e4 LT |
551 | struct net_device *dev = skb->dev; |
552 | struct in6_addr *saddr, *daddr; | |
553 | u32 ulen = 0; | |
ef28d1a2 | 554 | struct net *net = dev_net(skb->dev); |
1da177e4 LT |
555 | |
556 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
557 | goto short_packet; | |
558 | ||
0660e03f ACM |
559 | saddr = &ipv6_hdr(skb)->saddr; |
560 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 561 | uh = udp_hdr(skb); |
1da177e4 LT |
562 | |
563 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
564 | if (ulen > skb->len) |
565 | goto short_packet; | |
1da177e4 | 566 | |
759e5d00 HX |
567 | if (proto == IPPROTO_UDP) { |
568 | /* UDP validates ulen. */ | |
1da177e4 | 569 | |
ba4e58ec GR |
570 | /* Check for jumbo payload */ |
571 | if (ulen == 0) | |
572 | ulen = skb->len; | |
1da177e4 | 573 | |
ba4e58ec GR |
574 | if (ulen < sizeof(*uh)) |
575 | goto short_packet; | |
1da177e4 | 576 | |
ba4e58ec GR |
577 | if (ulen < skb->len) { |
578 | if (pskb_trim_rcsum(skb, ulen)) | |
579 | goto short_packet; | |
0660e03f ACM |
580 | saddr = &ipv6_hdr(skb)->saddr; |
581 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 582 | uh = udp_hdr(skb); |
ba4e58ec | 583 | } |
ba4e58ec | 584 | } |
1da177e4 | 585 | |
759e5d00 HX |
586 | if (udp6_csum_init(skb, uh, proto)) |
587 | goto discard; | |
588 | ||
1ab1457c YH |
589 | /* |
590 | * Multicast receive code | |
1da177e4 | 591 | */ |
ba4e58ec | 592 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
593 | return __udp6_lib_mcast_deliver(net, skb, |
594 | saddr, daddr, udptable); | |
1da177e4 LT |
595 | |
596 | /* Unicast */ | |
597 | ||
1ab1457c | 598 | /* |
1da177e4 LT |
599 | * check socket cache ... must talk to Alan about his plans |
600 | * for sock caches... i'll skip this for now. | |
601 | */ | |
607c4aaf | 602 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
1da177e4 LT |
603 | |
604 | if (sk == NULL) { | |
605 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) | |
606 | goto discard; | |
607 | ||
ba4e58ec | 608 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 609 | goto discard; |
ef28d1a2 PE |
610 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, |
611 | proto == IPPROTO_UDPLITE); | |
1da177e4 LT |
612 | |
613 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0, dev); | |
614 | ||
615 | kfree_skb(skb); | |
add459aa | 616 | return 0; |
1da177e4 | 617 | } |
1ab1457c | 618 | |
1da177e4 | 619 | /* deliver */ |
1ab1457c | 620 | |
d97106ea | 621 | bh_lock_sock(sk); |
95766fff HA |
622 | if (!sock_owned_by_user(sk)) |
623 | udpv6_queue_rcv_skb(sk, skb); | |
624 | else | |
625 | sk_add_backlog(sk, skb); | |
626 | bh_unlock_sock(sk); | |
1da177e4 | 627 | sock_put(sk); |
add459aa | 628 | return 0; |
1da177e4 | 629 | |
1ab1457c | 630 | short_packet: |
ba4e58ec | 631 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: %d/%u\n", |
db8dac20 | 632 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
759e5d00 | 633 | ulen, skb->len); |
1da177e4 LT |
634 | |
635 | discard: | |
ef28d1a2 | 636 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 637 | kfree_skb(skb); |
add459aa | 638 | return 0; |
1da177e4 | 639 | } |
ba4e58ec | 640 | |
e5bbef20 | 641 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 642 | { |
645ca708 | 643 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
644 | } |
645 | ||
1da177e4 LT |
646 | /* |
647 | * Throw away all pending data and cancel the corking. Socket is locked. | |
648 | */ | |
649 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
650 | { | |
651 | struct udp_sock *up = udp_sk(sk); | |
652 | ||
36d926b9 DL |
653 | if (up->pending == AF_INET) |
654 | udp_flush_pending_frames(sk); | |
655 | else if (up->pending) { | |
1da177e4 LT |
656 | up->len = 0; |
657 | up->pending = 0; | |
658 | ip6_flush_pending_frames(sk); | |
1ab1457c | 659 | } |
1da177e4 LT |
660 | } |
661 | ||
493c6be3 SS |
662 | /** |
663 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming | |
664 | * @sk: socket we are sending on | |
665 | * @skb: sk_buff containing the filled-in UDP header | |
666 | * (checksum field must be zeroed out) | |
667 | */ | |
668 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
669 | const struct in6_addr *saddr, | |
670 | const struct in6_addr *daddr, int len) | |
671 | { | |
672 | unsigned int offset; | |
673 | struct udphdr *uh = udp_hdr(skb); | |
674 | __wsum csum = 0; | |
675 | ||
676 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
677 | /* Only one fragment on the socket. */ | |
678 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
679 | skb->csum_offset = offsetof(struct udphdr, check); | |
680 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
681 | } else { | |
682 | /* | |
683 | * HW-checksum won't work as there are two or more | |
684 | * fragments on the socket so that all csums of sk_buffs | |
685 | * should be together | |
686 | */ | |
687 | offset = skb_transport_offset(skb); | |
688 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
689 | ||
690 | skb->ip_summed = CHECKSUM_NONE; | |
691 | ||
692 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
693 | csum = csum_add(csum, skb->csum); | |
694 | } | |
695 | ||
696 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
697 | csum); | |
698 | if (uh->check == 0) | |
699 | uh->check = CSUM_MANGLED_0; | |
700 | } | |
701 | } | |
702 | ||
1da177e4 LT |
703 | /* |
704 | * Sending | |
705 | */ | |
706 | ||
4c0a6cb0 | 707 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
708 | { |
709 | struct sk_buff *skb; | |
710 | struct udphdr *uh; | |
4c0a6cb0 | 711 | struct udp_sock *up = udp_sk(sk); |
1da177e4 LT |
712 | struct inet_sock *inet = inet_sk(sk); |
713 | struct flowi *fl = &inet->cork.fl; | |
714 | int err = 0; | |
b2bf1e26 | 715 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 716 | __wsum csum = 0; |
1da177e4 LT |
717 | |
718 | /* Grab the skbuff where UDP header space exists. */ | |
719 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
720 | goto out; | |
721 | ||
722 | /* | |
723 | * Create a UDP header | |
724 | */ | |
4bedb452 | 725 | uh = udp_hdr(skb); |
1da177e4 LT |
726 | uh->source = fl->fl_ip_sport; |
727 | uh->dest = fl->fl_ip_dport; | |
728 | uh->len = htons(up->len); | |
729 | uh->check = 0; | |
730 | ||
b2bf1e26 | 731 | if (is_udplite) |
ba4e58ec | 732 | csum = udplite_csum_outgoing(sk, skb); |
493c6be3 SS |
733 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
734 | udp6_hwcsum_outgoing(sk, skb, &fl->fl6_src, &fl->fl6_dst, | |
735 | up->len); | |
736 | goto send; | |
737 | } else | |
ba4e58ec | 738 | csum = udp_csum_outgoing(sk, skb); |
1da177e4 | 739 | |
ba4e58ec GR |
740 | /* add protocol-dependent pseudo-header */ |
741 | uh->check = csum_ipv6_magic(&fl->fl6_src, &fl->fl6_dst, | |
742 | up->len, fl->proto, csum ); | |
1da177e4 | 743 | if (uh->check == 0) |
f6ab0288 | 744 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 745 | |
493c6be3 | 746 | send: |
1da177e4 | 747 | err = ip6_push_pending_frames(sk); |
6ce9e7b5 ED |
748 | if (err) { |
749 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
750 | UDP6_INC_STATS_USER(sock_net(sk), | |
751 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
752 | err = 0; | |
753 | } | |
754 | } else | |
755 | UDP6_INC_STATS_USER(sock_net(sk), | |
756 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
757 | out: |
758 | up->len = 0; | |
759 | up->pending = 0; | |
760 | return err; | |
761 | } | |
762 | ||
ba4e58ec | 763 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
764 | struct msghdr *msg, size_t len) |
765 | { | |
766 | struct ipv6_txoptions opt_space; | |
767 | struct udp_sock *up = udp_sk(sk); | |
768 | struct inet_sock *inet = inet_sk(sk); | |
769 | struct ipv6_pinfo *np = inet6_sk(sk); | |
770 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
771 | struct in6_addr *daddr, *final_p = NULL, final; | |
772 | struct ipv6_txoptions *opt = NULL; | |
773 | struct ip6_flowlabel *flowlabel = NULL; | |
132a55f3 | 774 | struct flowi fl; |
1da177e4 LT |
775 | struct dst_entry *dst; |
776 | int addr_len = msg->msg_namelen; | |
777 | int ulen = len; | |
778 | int hlimit = -1; | |
41a1f8ea | 779 | int tclass = -1; |
1da177e4 LT |
780 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
781 | int err; | |
987905de | 782 | int connected = 0; |
b2bf1e26 | 783 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 784 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
785 | |
786 | /* destination address check */ | |
787 | if (sin6) { | |
788 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
789 | return -EINVAL; | |
790 | ||
791 | switch (sin6->sin6_family) { | |
792 | case AF_INET6: | |
793 | if (addr_len < SIN6_LEN_RFC2133) | |
794 | return -EINVAL; | |
795 | daddr = &sin6->sin6_addr; | |
796 | break; | |
797 | case AF_INET: | |
798 | goto do_udp_sendmsg; | |
799 | case AF_UNSPEC: | |
800 | msg->msg_name = sin6 = NULL; | |
801 | msg->msg_namelen = addr_len = 0; | |
802 | daddr = NULL; | |
803 | break; | |
804 | default: | |
805 | return -EINVAL; | |
806 | } | |
807 | } else if (!up->pending) { | |
808 | if (sk->sk_state != TCP_ESTABLISHED) | |
809 | return -EDESTADDRREQ; | |
810 | daddr = &np->daddr; | |
1ab1457c | 811 | } else |
1da177e4 LT |
812 | daddr = NULL; |
813 | ||
814 | if (daddr) { | |
e773e4fa | 815 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
816 | struct sockaddr_in sin; |
817 | sin.sin_family = AF_INET; | |
c720c7e8 | 818 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
819 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
820 | msg->msg_name = &sin; | |
821 | msg->msg_namelen = sizeof(sin); | |
822 | do_udp_sendmsg: | |
823 | if (__ipv6_only_sock(sk)) | |
824 | return -ENETUNREACH; | |
825 | return udp_sendmsg(iocb, sk, msg, len); | |
826 | } | |
827 | } | |
828 | ||
829 | if (up->pending == AF_INET) | |
830 | return udp_sendmsg(iocb, sk, msg, len); | |
831 | ||
832 | /* Rough check on arithmetic overflow, | |
b59e139b | 833 | better check is made in ip6_append_data(). |
1da177e4 LT |
834 | */ |
835 | if (len > INT_MAX - sizeof(struct udphdr)) | |
836 | return -EMSGSIZE; | |
1ab1457c | 837 | |
1da177e4 LT |
838 | if (up->pending) { |
839 | /* | |
840 | * There are pending frames. | |
841 | * The socket lock must be held while it's corked. | |
842 | */ | |
843 | lock_sock(sk); | |
844 | if (likely(up->pending)) { | |
845 | if (unlikely(up->pending != AF_INET6)) { | |
846 | release_sock(sk); | |
847 | return -EAFNOSUPPORT; | |
848 | } | |
849 | dst = NULL; | |
850 | goto do_append_data; | |
851 | } | |
852 | release_sock(sk); | |
853 | } | |
854 | ulen += sizeof(struct udphdr); | |
855 | ||
132a55f3 | 856 | memset(&fl, 0, sizeof(fl)); |
1da177e4 LT |
857 | |
858 | if (sin6) { | |
859 | if (sin6->sin6_port == 0) | |
860 | return -EINVAL; | |
861 | ||
132a55f3 | 862 | fl.fl_ip_dport = sin6->sin6_port; |
1da177e4 LT |
863 | daddr = &sin6->sin6_addr; |
864 | ||
865 | if (np->sndflow) { | |
132a55f3 HX |
866 | fl.fl6_flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
867 | if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) { | |
868 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
869 | if (flowlabel == NULL) |
870 | return -EINVAL; | |
871 | daddr = &flowlabel->dst; | |
872 | } | |
873 | } | |
874 | ||
875 | /* | |
876 | * Otherwise it will be difficult to maintain | |
877 | * sk->sk_dst_cache. | |
878 | */ | |
879 | if (sk->sk_state == TCP_ESTABLISHED && | |
880 | ipv6_addr_equal(daddr, &np->daddr)) | |
881 | daddr = &np->daddr; | |
882 | ||
883 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
884 | sin6->sin6_scope_id && | |
885 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) | |
132a55f3 | 886 | fl.oif = sin6->sin6_scope_id; |
1da177e4 LT |
887 | } else { |
888 | if (sk->sk_state != TCP_ESTABLISHED) | |
889 | return -EDESTADDRREQ; | |
890 | ||
c720c7e8 | 891 | fl.fl_ip_dport = inet->inet_dport; |
1da177e4 | 892 | daddr = &np->daddr; |
132a55f3 | 893 | fl.fl6_flowlabel = np->flow_label; |
987905de | 894 | connected = 1; |
1da177e4 LT |
895 | } |
896 | ||
132a55f3 HX |
897 | if (!fl.oif) |
898 | fl.oif = sk->sk_bound_dev_if; | |
1da177e4 | 899 | |
9f690db7 YH |
900 | if (!fl.oif) |
901 | fl.oif = np->sticky_pktinfo.ipi6_ifindex; | |
902 | ||
51953d5b BH |
903 | fl.mark = sk->sk_mark; |
904 | ||
1da177e4 LT |
905 | if (msg->msg_controllen) { |
906 | opt = &opt_space; | |
907 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
908 | opt->tot_len = sizeof(*opt); | |
909 | ||
91e1908f | 910 | err = datagram_send_ctl(sock_net(sk), msg, &fl, opt, &hlimit, &tclass); |
1da177e4 LT |
911 | if (err < 0) { |
912 | fl6_sock_release(flowlabel); | |
913 | return err; | |
914 | } | |
132a55f3 HX |
915 | if ((fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
916 | flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel); | |
1da177e4 LT |
917 | if (flowlabel == NULL) |
918 | return -EINVAL; | |
919 | } | |
920 | if (!(opt->opt_nflen|opt->opt_flen)) | |
921 | opt = NULL; | |
987905de | 922 | connected = 0; |
1da177e4 LT |
923 | } |
924 | if (opt == NULL) | |
925 | opt = np->opt; | |
df9890c3 YH |
926 | if (flowlabel) |
927 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
928 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 929 | |
ba4e58ec | 930 | fl.proto = sk->sk_protocol; |
876c7f41 BH |
931 | if (!ipv6_addr_any(daddr)) |
932 | ipv6_addr_copy(&fl.fl6_dst, daddr); | |
933 | else | |
934 | fl.fl6_dst.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ | |
132a55f3 HX |
935 | if (ipv6_addr_any(&fl.fl6_src) && !ipv6_addr_any(&np->saddr)) |
936 | ipv6_addr_copy(&fl.fl6_src, &np->saddr); | |
c720c7e8 | 937 | fl.fl_ip_sport = inet->inet_sport; |
1ab1457c | 938 | |
1da177e4 LT |
939 | /* merge ip6_build_xmit from ip6_output */ |
940 | if (opt && opt->srcrt) { | |
941 | struct rt0_hdr *rt0 = (struct rt0_hdr *) opt->srcrt; | |
132a55f3 HX |
942 | ipv6_addr_copy(&final, &fl.fl6_dst); |
943 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
1da177e4 | 944 | final_p = &final; |
987905de | 945 | connected = 0; |
1da177e4 LT |
946 | } |
947 | ||
132a55f3 HX |
948 | if (!fl.oif && ipv6_addr_is_multicast(&fl.fl6_dst)) { |
949 | fl.oif = np->mcast_oif; | |
987905de MK |
950 | connected = 0; |
951 | } | |
1da177e4 | 952 | |
132a55f3 | 953 | security_sk_classify_flow(sk, &fl); |
beb8d13b | 954 | |
132a55f3 | 955 | err = ip6_sk_dst_lookup(sk, &dst, &fl); |
1da177e4 LT |
956 | if (err) |
957 | goto out; | |
958 | if (final_p) | |
132a55f3 | 959 | ipv6_addr_copy(&fl.fl6_dst, final_p); |
1da177e4 | 960 | |
52479b62 AD |
961 | err = __xfrm_lookup(sock_net(sk), &dst, &fl, sk, XFRM_LOOKUP_WAIT); |
962 | if (err < 0) { | |
14e50e57 DM |
963 | if (err == -EREMOTE) |
964 | err = ip6_dst_blackhole(sk, &dst, &fl); | |
965 | if (err < 0) | |
966 | goto out; | |
967 | } | |
1da177e4 LT |
968 | |
969 | if (hlimit < 0) { | |
132a55f3 | 970 | if (ipv6_addr_is_multicast(&fl.fl6_dst)) |
1da177e4 LT |
971 | hlimit = np->mcast_hops; |
972 | else | |
973 | hlimit = np->hop_limit; | |
974 | if (hlimit < 0) | |
6b75d090 | 975 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 LT |
976 | } |
977 | ||
e651f03a | 978 | if (tclass < 0) |
41a1f8ea | 979 | tclass = np->tclass; |
41a1f8ea | 980 | |
1da177e4 LT |
981 | if (msg->msg_flags&MSG_CONFIRM) |
982 | goto do_confirm; | |
983 | back_from_confirm: | |
984 | ||
985 | lock_sock(sk); | |
986 | if (unlikely(up->pending)) { | |
987 | /* The socket is already corked while preparing it. */ | |
988 | /* ... which is an evident application bug. --ANK */ | |
989 | release_sock(sk); | |
990 | ||
64ce2073 | 991 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
992 | err = -EINVAL; |
993 | goto out; | |
994 | } | |
995 | ||
996 | up->pending = AF_INET6; | |
997 | ||
998 | do_append_data: | |
999 | up->len += ulen; | |
ba4e58ec GR |
1000 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1001 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
132a55f3 | 1002 | sizeof(struct udphdr), hlimit, tclass, opt, &fl, |
41a1f8ea YH |
1003 | (struct rt6_info*)dst, |
1004 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags); | |
1da177e4 LT |
1005 | if (err) |
1006 | udp_v6_flush_pending_frames(sk); | |
1007 | else if (!corkreq) | |
4c0a6cb0 | 1008 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1009 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1010 | up->pending = 0; | |
1da177e4 | 1011 | |
a5e7c210 DM |
1012 | if (dst) { |
1013 | if (connected) { | |
1014 | ip6_dst_store(sk, dst, | |
132a55f3 | 1015 | ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ? |
8e1ef0a9 YH |
1016 | &np->daddr : NULL, |
1017 | #ifdef CONFIG_IPV6_SUBTREES | |
132a55f3 | 1018 | ipv6_addr_equal(&fl.fl6_src, &np->saddr) ? |
8e1ef0a9 YH |
1019 | &np->saddr : |
1020 | #endif | |
1021 | NULL); | |
a5e7c210 DM |
1022 | } else { |
1023 | dst_release(dst); | |
1024 | } | |
a3c96089 | 1025 | dst = NULL; |
a5e7c210 DM |
1026 | } |
1027 | ||
1da177e4 LT |
1028 | if (err > 0) |
1029 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1030 | release_sock(sk); | |
1031 | out: | |
a3c96089 | 1032 | dst_release(dst); |
1da177e4 | 1033 | fl6_sock_release(flowlabel); |
cd562c98 | 1034 | if (!err) |
1da177e4 | 1035 | return len; |
a18135eb DM |
1036 | /* |
1037 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1038 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1039 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1040 | * things). We could add another new stat but at least for now that | |
1041 | * seems like overkill. | |
1042 | */ | |
1043 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1044 | UDP6_INC_STATS_USER(sock_net(sk), |
1045 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1046 | } |
1da177e4 LT |
1047 | return err; |
1048 | ||
1049 | do_confirm: | |
1050 | dst_confirm(dst); | |
1051 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1052 | goto back_from_confirm; | |
1053 | err = 0; | |
1054 | goto out; | |
1055 | } | |
1056 | ||
7d06b2e0 | 1057 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 LT |
1058 | { |
1059 | lock_sock(sk); | |
1060 | udp_v6_flush_pending_frames(sk); | |
1061 | release_sock(sk); | |
1062 | ||
1063 | inet6_destroy_sock(sk); | |
1da177e4 LT |
1064 | } |
1065 | ||
1066 | /* | |
1067 | * Socket option code for UDP | |
1068 | */ | |
ba4e58ec | 1069 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1070 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1071 | { |
db8dac20 | 1072 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1073 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1074 | udp_v6_push_pending_frames); | |
ba4e58ec | 1075 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1076 | } |
1077 | ||
1078 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1079 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1080 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1081 | { |
db8dac20 | 1082 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1083 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1084 | udp_v6_push_pending_frames); | |
ba4e58ec | 1085 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1086 | } |
1087 | #endif | |
1088 | ||
ba4e58ec GR |
1089 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1090 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1091 | { |
db8dac20 | 1092 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1093 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1094 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1095 | } |
1096 | ||
1097 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1098 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1099 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1100 | { |
db8dac20 | 1101 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1102 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1103 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1104 | } |
1105 | #endif | |
1106 | ||
ba735425 SS |
1107 | static int udp6_ufo_send_check(struct sk_buff *skb) |
1108 | { | |
1109 | struct ipv6hdr *ipv6h; | |
1110 | struct udphdr *uh; | |
1111 | ||
1112 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
1113 | return -EINVAL; | |
1114 | ||
1115 | ipv6h = ipv6_hdr(skb); | |
1116 | uh = udp_hdr(skb); | |
1117 | ||
1118 | uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
1119 | IPPROTO_UDP, 0); | |
1120 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1121 | skb->csum_offset = offsetof(struct udphdr, check); | |
1122 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1123 | return 0; | |
1124 | } | |
1125 | ||
1126 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, int features) | |
1127 | { | |
1128 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1129 | unsigned int mss; | |
1130 | unsigned int unfrag_ip6hlen, unfrag_len; | |
1131 | struct frag_hdr *fptr; | |
1132 | u8 *mac_start, *prevhdr; | |
1133 | u8 nexthdr; | |
1134 | u8 frag_hdr_sz = sizeof(struct frag_hdr); | |
1135 | int offset; | |
1136 | __wsum csum; | |
1137 | ||
1138 | mss = skb_shinfo(skb)->gso_size; | |
1139 | if (unlikely(skb->len <= mss)) | |
1140 | goto out; | |
1141 | ||
1142 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
1143 | /* Packet is from an untrusted source, reset gso_segs. */ | |
1144 | int type = skb_shinfo(skb)->gso_type; | |
1145 | ||
1146 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
1147 | !(type & (SKB_GSO_UDP)))) | |
1148 | goto out; | |
1149 | ||
1150 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
1151 | ||
1152 | segs = NULL; | |
1153 | goto out; | |
1154 | } | |
1155 | ||
1156 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
1157 | * do checksum of UDP packets sent as multiple IP fragments. | |
1158 | */ | |
1159 | offset = skb->csum_start - skb_headroom(skb); | |
1160 | csum = skb_checksum(skb, offset, skb->len- offset, 0); | |
1161 | offset += skb->csum_offset; | |
1162 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
1163 | skb->ip_summed = CHECKSUM_NONE; | |
1164 | ||
1165 | /* Check if there is enough headroom to insert fragment header. */ | |
1166 | if ((skb_headroom(skb) < frag_hdr_sz) && | |
1167 | pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) | |
1168 | goto out; | |
1169 | ||
1170 | /* Find the unfragmentable header and shift it left by frag_hdr_sz | |
1171 | * bytes to insert fragment header. | |
1172 | */ | |
1173 | unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
1174 | nexthdr = *prevhdr; | |
1175 | *prevhdr = NEXTHDR_FRAGMENT; | |
1176 | unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + | |
1177 | unfrag_ip6hlen; | |
1178 | mac_start = skb_mac_header(skb); | |
1179 | memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); | |
1180 | ||
1181 | skb->mac_header -= frag_hdr_sz; | |
1182 | skb->network_header -= frag_hdr_sz; | |
1183 | ||
1184 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); | |
1185 | fptr->nexthdr = nexthdr; | |
1186 | fptr->reserved = 0; | |
1187 | ipv6_select_ident(fptr); | |
1188 | ||
1189 | /* Fragment the skb. ipv6 header and the remaining fields of the | |
1190 | * fragment header are updated in ipv6_gso_segment() | |
1191 | */ | |
1192 | segs = skb_segment(skb, features); | |
1193 | ||
1194 | out: | |
1195 | return segs; | |
1196 | } | |
1197 | ||
41135cc8 | 1198 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1199 | .handler = udpv6_rcv, |
1200 | .err_handler = udpv6_err, | |
ba735425 SS |
1201 | .gso_send_check = udp6_ufo_send_check, |
1202 | .gso_segment = udp6_ufo_fragment, | |
1da177e4 LT |
1203 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1204 | }; | |
1205 | ||
1206 | /* ------------------------------------------------------------------------ */ | |
1207 | #ifdef CONFIG_PROC_FS | |
1208 | ||
1209 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) | |
1210 | { | |
1211 | struct inet_sock *inet = inet_sk(sp); | |
1212 | struct ipv6_pinfo *np = inet6_sk(sp); | |
1213 | struct in6_addr *dest, *src; | |
1214 | __u16 destp, srcp; | |
1215 | ||
1216 | dest = &np->daddr; | |
1217 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1218 | destp = ntohs(inet->inet_dport); |
1219 | srcp = ntohs(inet->inet_sport); | |
1da177e4 | 1220 | seq_printf(seq, |
f86dcc5a | 1221 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
cb61cb9b | 1222 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %p %d\n", |
1da177e4 LT |
1223 | bucket, |
1224 | src->s6_addr32[0], src->s6_addr32[1], | |
1225 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1226 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1227 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1228 | sp->sk_state, |
31e6d363 ED |
1229 | sk_wmem_alloc_get(sp), |
1230 | sk_rmem_alloc_get(sp), | |
1da177e4 LT |
1231 | 0, 0L, 0, |
1232 | sock_i_uid(sp), 0, | |
1233 | sock_i_ino(sp), | |
cb61cb9b ED |
1234 | atomic_read(&sp->sk_refcnt), sp, |
1235 | atomic_read(&sp->sk_drops)); | |
1da177e4 LT |
1236 | } |
1237 | ||
ba4e58ec | 1238 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1239 | { |
1240 | if (v == SEQ_START_TOKEN) | |
1241 | seq_printf(seq, | |
1242 | " sl " | |
1243 | "local_address " | |
1244 | "remote_address " | |
1245 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
cb61cb9b | 1246 | " uid timeout inode ref pointer drops\n"); |
1da177e4 LT |
1247 | else |
1248 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); | |
1249 | return 0; | |
1250 | } | |
1251 | ||
1da177e4 | 1252 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1253 | .name = "udp6", |
1254 | .family = AF_INET6, | |
645ca708 | 1255 | .udp_table = &udp_table, |
4ad96d39 DL |
1256 | .seq_fops = { |
1257 | .owner = THIS_MODULE, | |
1258 | }, | |
dda61925 DL |
1259 | .seq_ops = { |
1260 | .show = udp6_seq_show, | |
1261 | }, | |
1da177e4 LT |
1262 | }; |
1263 | ||
0c96d8c5 | 1264 | int udp6_proc_init(struct net *net) |
1da177e4 | 1265 | { |
0c96d8c5 | 1266 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1267 | } |
1268 | ||
0c96d8c5 DL |
1269 | void udp6_proc_exit(struct net *net) { |
1270 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1271 | } |
1272 | #endif /* CONFIG_PROC_FS */ | |
1273 | ||
1274 | /* ------------------------------------------------------------------------ */ | |
1275 | ||
1276 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1277 | .name = "UDPv6", |
1278 | .owner = THIS_MODULE, | |
ba4e58ec | 1279 | .close = udp_lib_close, |
543d9cfe ACM |
1280 | .connect = ip6_datagram_connect, |
1281 | .disconnect = udp_disconnect, | |
1282 | .ioctl = udp_ioctl, | |
1283 | .destroy = udpv6_destroy_sock, | |
1284 | .setsockopt = udpv6_setsockopt, | |
1285 | .getsockopt = udpv6_getsockopt, | |
1286 | .sendmsg = udpv6_sendmsg, | |
1287 | .recvmsg = udpv6_recvmsg, | |
1288 | .backlog_rcv = udpv6_queue_rcv_skb, | |
ba4e58ec GR |
1289 | .hash = udp_lib_hash, |
1290 | .unhash = udp_lib_unhash, | |
543d9cfe | 1291 | .get_port = udp_v6_get_port, |
95766fff HA |
1292 | .memory_allocated = &udp_memory_allocated, |
1293 | .sysctl_mem = sysctl_udp_mem, | |
1294 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1295 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1296 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1297 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1298 | .h.udp_table = &udp_table, |
3fdadf7d | 1299 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1300 | .compat_setsockopt = compat_udpv6_setsockopt, |
1301 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1302 | #endif |
1da177e4 LT |
1303 | }; |
1304 | ||
1da177e4 LT |
1305 | static struct inet_protosw udpv6_protosw = { |
1306 | .type = SOCK_DGRAM, | |
1307 | .protocol = IPPROTO_UDP, | |
1308 | .prot = &udpv6_prot, | |
1309 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1310 | .no_check = UDP_CSUM_DEFAULT, |
1311 | .flags = INET_PROTOSW_PERMANENT, | |
1312 | }; | |
1313 | ||
1314 | ||
7f4e4868 | 1315 | int __init udpv6_init(void) |
1da177e4 | 1316 | { |
7f4e4868 DL |
1317 | int ret; |
1318 | ||
1319 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1320 | if (ret) | |
1321 | goto out; | |
1322 | ||
1323 | ret = inet6_register_protosw(&udpv6_protosw); | |
1324 | if (ret) | |
1325 | goto out_udpv6_protocol; | |
1326 | out: | |
1327 | return ret; | |
1328 | ||
1329 | out_udpv6_protocol: | |
1330 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1331 | goto out; | |
1332 | } | |
1333 | ||
09f7709f | 1334 | void udpv6_exit(void) |
7f4e4868 DL |
1335 | { |
1336 | inet6_unregister_protosw(&udpv6_protosw); | |
1337 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1338 | } |