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> |
1da177e4 LT |
38 | #include <asm/uaccess.h> |
39 | ||
1da177e4 LT |
40 | #include <net/ndisc.h> |
41 | #include <net/protocol.h> | |
42 | #include <net/transp_v6.h> | |
43 | #include <net/ip6_route.h> | |
1da177e4 | 44 | #include <net/raw.h> |
c752f073 | 45 | #include <net/tcp_states.h> |
1da177e4 LT |
46 | #include <net/ip6_checksum.h> |
47 | #include <net/xfrm.h> | |
48 | ||
49 | #include <linux/proc_fs.h> | |
50 | #include <linux/seq_file.h> | |
ba4e58ec | 51 | #include "udp_impl.h" |
1da177e4 | 52 | |
b2f5e7cd VY |
53 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
54 | { | |
55 | const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; | |
56 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); | |
68835aba ED |
57 | __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); |
58 | __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); | |
b2f5e7cd VY |
59 | int sk_ipv6only = ipv6_only_sock(sk); |
60 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
61 | int addr_type = ipv6_addr_type(sk_rcv_saddr6); | |
62 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; | |
63 | ||
64 | /* if both are mapped, treat as IPv4 */ | |
65 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 | 66 | return (!sk2_ipv6only && |
c720c7e8 ED |
67 | (!sk1_rcv_saddr || !sk2_rcv_saddr || |
68 | sk1_rcv_saddr == sk2_rcv_saddr)); | |
b2f5e7cd VY |
69 | |
70 | if (addr_type2 == IPV6_ADDR_ANY && | |
71 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
72 | return 1; | |
73 | ||
74 | if (addr_type == IPV6_ADDR_ANY && | |
75 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) | |
76 | return 1; | |
77 | ||
78 | if (sk2_rcv_saddr6 && | |
79 | ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) | |
80 | return 1; | |
81 | ||
82 | return 0; | |
83 | } | |
84 | ||
d4cada4a ED |
85 | static unsigned int udp6_portaddr_hash(struct net *net, |
86 | const struct in6_addr *addr6, | |
87 | unsigned int port) | |
88 | { | |
89 | unsigned int hash, mix = net_hash_mix(net); | |
90 | ||
91 | if (ipv6_addr_any(addr6)) | |
92 | hash = jhash_1word(0, mix); | |
856540ee | 93 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 94 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 95 | else |
0eae88f3 | 96 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
97 | |
98 | return hash ^ port; | |
99 | } | |
100 | ||
101 | ||
6ba5a3c5 | 102 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 103 | { |
30fff923 ED |
104 | unsigned int hash2_nulladdr = |
105 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 106 | unsigned int hash2_partial = |
30fff923 ED |
107 | udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); |
108 | ||
d4cada4a | 109 | /* precompute partial secondary hash */ |
30fff923 ED |
110 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
111 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
112 | } |
113 | ||
719f8358 ED |
114 | static void udp_v6_rehash(struct sock *sk) |
115 | { | |
116 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
117 | &inet6_sk(sk)->rcv_saddr, | |
118 | inet_sk(sk)->inet_num); | |
119 | ||
120 | udp_lib_rehash(sk, new_hash); | |
121 | } | |
122 | ||
645ca708 ED |
123 | static inline int compute_score(struct sock *sk, struct net *net, |
124 | unsigned short hnum, | |
88440ae7 BS |
125 | const struct in6_addr *saddr, __be16 sport, |
126 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
127 | int dif) |
128 | { | |
129 | int score = -1; | |
130 | ||
d4cada4a | 131 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
132 | sk->sk_family == PF_INET6) { |
133 | struct ipv6_pinfo *np = inet6_sk(sk); | |
134 | struct inet_sock *inet = inet_sk(sk); | |
135 | ||
136 | score = 0; | |
c720c7e8 ED |
137 | if (inet->inet_dport) { |
138 | if (inet->inet_dport != sport) | |
645ca708 ED |
139 | return -1; |
140 | score++; | |
141 | } | |
142 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
143 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
144 | return -1; | |
145 | score++; | |
146 | } | |
147 | if (!ipv6_addr_any(&np->daddr)) { | |
148 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
149 | return -1; | |
150 | score++; | |
151 | } | |
152 | if (sk->sk_bound_dev_if) { | |
153 | if (sk->sk_bound_dev_if != dif) | |
154 | return -1; | |
155 | score++; | |
156 | } | |
157 | } | |
158 | return score; | |
159 | } | |
160 | ||
fddc17de ED |
161 | #define SCORE2_MAX (1 + 1 + 1) |
162 | static inline int compute_score2(struct sock *sk, struct net *net, | |
163 | const struct in6_addr *saddr, __be16 sport, | |
164 | const struct in6_addr *daddr, unsigned short hnum, | |
165 | int dif) | |
166 | { | |
167 | int score = -1; | |
168 | ||
169 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && | |
170 | sk->sk_family == PF_INET6) { | |
171 | struct ipv6_pinfo *np = inet6_sk(sk); | |
172 | struct inet_sock *inet = inet_sk(sk); | |
173 | ||
174 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
175 | return -1; | |
176 | score = 0; | |
177 | if (inet->inet_dport) { | |
178 | if (inet->inet_dport != sport) | |
179 | return -1; | |
180 | score++; | |
181 | } | |
182 | if (!ipv6_addr_any(&np->daddr)) { | |
183 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
184 | return -1; | |
185 | score++; | |
186 | } | |
187 | if (sk->sk_bound_dev_if) { | |
188 | if (sk->sk_bound_dev_if != dif) | |
189 | return -1; | |
190 | score++; | |
191 | } | |
192 | } | |
193 | return score; | |
194 | } | |
195 | ||
fddc17de ED |
196 | |
197 | /* called with read_rcu_lock() */ | |
198 | static struct sock *udp6_lib_lookup2(struct net *net, | |
199 | const struct in6_addr *saddr, __be16 sport, | |
200 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
201 | struct udp_hslot *hslot2, unsigned int slot2) | |
202 | { | |
203 | struct sock *sk, *result; | |
204 | struct hlist_nulls_node *node; | |
205 | int score, badness; | |
206 | ||
207 | begin: | |
208 | result = NULL; | |
209 | badness = -1; | |
210 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
211 | score = compute_score2(sk, net, saddr, sport, | |
212 | daddr, hnum, dif); | |
213 | if (score > badness) { | |
214 | result = sk; | |
215 | badness = score; | |
216 | if (score == SCORE2_MAX) | |
217 | goto exact_match; | |
218 | } | |
219 | } | |
220 | /* | |
221 | * if the nulls value we got at the end of this lookup is | |
222 | * not the expected one, we must restart lookup. | |
223 | * We probably met an item that was moved to another chain. | |
224 | */ | |
225 | if (get_nulls_value(node) != slot2) | |
226 | goto begin; | |
227 | ||
228 | if (result) { | |
229 | exact_match: | |
c31504dc | 230 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
231 | result = NULL; |
232 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
233 | daddr, hnum, dif) < badness)) { | |
234 | sock_put(result); | |
235 | goto begin; | |
236 | } | |
237 | } | |
238 | return result; | |
239 | } | |
240 | ||
fce82338 | 241 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
242 | const struct in6_addr *saddr, __be16 sport, |
243 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 | 244 | int dif, struct udp_table *udptable) |
1da177e4 | 245 | { |
271b72c7 | 246 | struct sock *sk, *result; |
88ab1932 | 247 | struct hlist_nulls_node *node; |
1da177e4 | 248 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
249 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
250 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
271b72c7 | 251 | int score, badness; |
645ca708 | 252 | |
271b72c7 | 253 | rcu_read_lock(); |
fddc17de ED |
254 | if (hslot->count > 10) { |
255 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
256 | slot2 = hash2 & udptable->mask; | |
257 | hslot2 = &udptable->hash2[slot2]; | |
258 | if (hslot->count < hslot2->count) | |
259 | goto begin; | |
260 | ||
261 | result = udp6_lib_lookup2(net, saddr, sport, | |
262 | daddr, hnum, dif, | |
263 | hslot2, slot2); | |
264 | if (!result) { | |
265 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
266 | slot2 = hash2 & udptable->mask; | |
267 | hslot2 = &udptable->hash2[slot2]; | |
268 | if (hslot->count < hslot2->count) | |
269 | goto begin; | |
270 | ||
1223c67c JBD |
271 | result = udp6_lib_lookup2(net, saddr, sport, |
272 | &in6addr_any, hnum, dif, | |
fddc17de ED |
273 | hslot2, slot2); |
274 | } | |
275 | rcu_read_unlock(); | |
276 | return result; | |
277 | } | |
271b72c7 ED |
278 | begin: |
279 | result = NULL; | |
280 | badness = -1; | |
88ab1932 | 281 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
282 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
283 | if (score > badness) { | |
284 | result = sk; | |
285 | badness = score; | |
1da177e4 LT |
286 | } |
287 | } | |
88ab1932 ED |
288 | /* |
289 | * if the nulls value we got at the end of this lookup is | |
290 | * not the expected one, we must restart lookup. | |
291 | * We probably met an item that was moved to another chain. | |
292 | */ | |
fddc17de | 293 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
294 | goto begin; |
295 | ||
271b72c7 | 296 | if (result) { |
c31504dc | 297 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
298 | result = NULL; |
299 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
300 | daddr, dport, dif) < badness)) { | |
301 | sock_put(result); | |
302 | goto begin; | |
303 | } | |
304 | } | |
305 | rcu_read_unlock(); | |
1da177e4 LT |
306 | return result; |
307 | } | |
fce82338 | 308 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 309 | |
607c4aaf KK |
310 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
311 | __be16 sport, __be16 dport, | |
645ca708 | 312 | struct udp_table *udptable) |
607c4aaf | 313 | { |
23542618 | 314 | struct sock *sk; |
b71d1d42 | 315 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 316 | |
23542618 KK |
317 | if (unlikely(sk = skb_steal_sock(skb))) |
318 | return sk; | |
adf30907 ED |
319 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
320 | &iph->daddr, dport, inet6_iif(skb), | |
321 | udptable); | |
607c4aaf KK |
322 | } |
323 | ||
aa976fc0 BS |
324 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
325 | const struct in6_addr *daddr, __be16 dport, int dif) | |
326 | { | |
327 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); | |
328 | } | |
329 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
330 | ||
331 | ||
1da177e4 LT |
332 | /* |
333 | * This should be easy, if there is something there we | |
334 | * return it, otherwise we block. | |
335 | */ | |
336 | ||
ba4e58ec | 337 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
338 | struct msghdr *msg, size_t len, |
339 | int noblock, int flags, int *addr_len) | |
340 | { | |
341 | struct ipv6_pinfo *np = inet6_sk(sk); | |
342 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 343 | struct sk_buff *skb; |
59c2cdae | 344 | unsigned int ulen, copied; |
3f518bf7 | 345 | int peeked, off = 0; |
759e5d00 HX |
346 | int err; |
347 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 348 | int is_udp4; |
8a74ad60 | 349 | bool slow; |
1da177e4 | 350 | |
1ab1457c | 351 | if (addr_len) |
3dde2598 | 352 | *addr_len = sizeof(struct sockaddr_in6); |
1ab1457c | 353 | |
1da177e4 LT |
354 | if (flags & MSG_ERRQUEUE) |
355 | return ipv6_recv_error(sk, msg, len); | |
356 | ||
4b340ae2 BH |
357 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
358 | return ipv6_recv_rxpmtu(sk, msg, len); | |
359 | ||
1da177e4 | 360 | try_again: |
a59322be | 361 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 362 | &peeked, &off, &err); |
1da177e4 LT |
363 | if (!skb) |
364 | goto out; | |
365 | ||
759e5d00 | 366 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
367 | copied = len; |
368 | if (copied > ulen) | |
369 | copied = ulen; | |
370 | else if (copied < ulen) | |
1ab1457c | 371 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 372 | |
f26ba175 WY |
373 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
374 | ||
ba4e58ec | 375 | /* |
759e5d00 HX |
376 | * If checksum is needed at all, try to do it while copying the |
377 | * data. If the data is truncated, or if we only want a partial | |
378 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 379 | */ |
ba4e58ec | 380 | |
59c2cdae | 381 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
759e5d00 | 382 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 383 | goto csum_copy_err; |
ba4e58ec GR |
384 | } |
385 | ||
60476372 | 386 | if (skb_csum_unnecessary(skb)) |
ba4e58ec | 387 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
59c2cdae | 388 | msg->msg_iov, copied ); |
ba4e58ec | 389 | else { |
1da177e4 LT |
390 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
391 | if (err == -EINVAL) | |
392 | goto csum_copy_err; | |
393 | } | |
394 | if (err) | |
395 | goto out_free; | |
396 | ||
f26ba175 WY |
397 | if (!peeked) { |
398 | if (is_udp4) | |
399 | UDP_INC_STATS_USER(sock_net(sk), | |
400 | UDP_MIB_INDATAGRAMS, is_udplite); | |
401 | else | |
402 | UDP6_INC_STATS_USER(sock_net(sk), | |
403 | UDP_MIB_INDATAGRAMS, is_udplite); | |
404 | } | |
cb75994e | 405 | |
3b885787 | 406 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
407 | |
408 | /* Copy the address. */ | |
409 | if (msg->msg_name) { | |
410 | struct sockaddr_in6 *sin6; | |
1ab1457c | 411 | |
1da177e4 LT |
412 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
413 | sin6->sin6_family = AF_INET6; | |
4bedb452 | 414 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 LT |
415 | sin6->sin6_flowinfo = 0; |
416 | sin6->sin6_scope_id = 0; | |
417 | ||
f26ba175 | 418 | if (is_udp4) |
b301e82c BH |
419 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
420 | &sin6->sin6_addr); | |
1da177e4 | 421 | else { |
4e3fd7a0 | 422 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 LT |
423 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
424 | sin6->sin6_scope_id = IP6CB(skb)->iif; | |
425 | } | |
426 | ||
427 | } | |
f26ba175 | 428 | if (is_udp4) { |
1da177e4 LT |
429 | if (inet->cmsg_flags) |
430 | ip_cmsg_recv(msg, skb); | |
431 | } else { | |
432 | if (np->rxopt.all) | |
433 | datagram_recv_ctl(sk, msg, skb); | |
1ab1457c | 434 | } |
1da177e4 | 435 | |
59c2cdae | 436 | err = copied; |
1da177e4 | 437 | if (flags & MSG_TRUNC) |
759e5d00 | 438 | err = ulen; |
1da177e4 LT |
439 | |
440 | out_free: | |
9d410c79 | 441 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
442 | out: |
443 | return err; | |
444 | ||
445 | csum_copy_err: | |
8a74ad60 | 446 | slow = lock_sock_fast(sk); |
0856f939 WY |
447 | if (!skb_kill_datagram(sk, skb, flags)) { |
448 | if (is_udp4) | |
449 | UDP_INC_STATS_USER(sock_net(sk), | |
450 | UDP_MIB_INERRORS, is_udplite); | |
451 | else | |
452 | UDP6_INC_STATS_USER(sock_net(sk), | |
453 | UDP_MIB_INERRORS, is_udplite); | |
454 | } | |
8a74ad60 | 455 | unlock_sock_fast(sk, slow); |
1da177e4 | 456 | |
32c90254 | 457 | if (noblock) |
1da177e4 | 458 | return -EAGAIN; |
9cfaa8de XZ |
459 | |
460 | /* starting over for a new packet */ | |
461 | msg->msg_flags &= ~MSG_TRUNC; | |
1da177e4 LT |
462 | goto try_again; |
463 | } | |
464 | ||
ba4e58ec | 465 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 466 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 467 | struct udp_table *udptable) |
1da177e4 LT |
468 | { |
469 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
470 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
471 | const struct in6_addr *saddr = &hdr->saddr; | |
472 | const struct in6_addr *daddr = &hdr->daddr; | |
1da177e4 LT |
473 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
474 | struct sock *sk; | |
475 | int err; | |
476 | ||
c346dca1 | 477 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 478 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
479 | if (sk == NULL) |
480 | return; | |
481 | ||
81aded24 DM |
482 | if (type == ICMPV6_PKT_TOOBIG) |
483 | ip6_sk_update_pmtu(skb, sk, info); | |
484 | ||
1da177e4 LT |
485 | np = inet6_sk(sk); |
486 | ||
487 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
488 | goto out; | |
489 | ||
490 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
491 | goto out; | |
492 | ||
b1faf566 | 493 | if (np->recverr) |
1da177e4 | 494 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 495 | |
1da177e4 LT |
496 | sk->sk_err = err; |
497 | sk->sk_error_report(sk); | |
498 | out: | |
499 | sock_put(sk); | |
500 | } | |
501 | ||
f7ad74fe BL |
502 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
503 | { | |
504 | int rc; | |
505 | ||
506 | if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) | |
507 | sock_rps_save_rxhash(sk, skb); | |
508 | ||
509 | rc = sock_queue_rcv_skb(sk, skb); | |
510 | if (rc < 0) { | |
511 | int is_udplite = IS_UDPLITE(sk); | |
512 | ||
513 | /* Note that an ENOMEM error is charged twice */ | |
514 | if (rc == -ENOMEM) | |
515 | UDP6_INC_STATS_BH(sock_net(sk), | |
516 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
517 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
518 | kfree_skb(skb); | |
519 | return -1; | |
520 | } | |
521 | return 0; | |
522 | } | |
523 | ||
ba4e58ec | 524 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba BH |
525 | struct inet6_skb_parm *opt, u8 type, |
526 | u8 code, int offset, __be32 info ) | |
ba4e58ec | 527 | { |
645ca708 | 528 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
529 | } |
530 | ||
d7f3f621 BL |
531 | static struct static_key udpv6_encap_needed __read_mostly; |
532 | void udpv6_encap_enable(void) | |
533 | { | |
534 | if (!static_key_enabled(&udpv6_encap_needed)) | |
535 | static_key_slow_inc(&udpv6_encap_needed); | |
536 | } | |
537 | EXPORT_SYMBOL(udpv6_encap_enable); | |
538 | ||
f7ad74fe | 539 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 540 | { |
ba4e58ec | 541 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 542 | int rc; |
b2bf1e26 | 543 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 544 | |
ba4e58ec GR |
545 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
546 | goto drop; | |
1da177e4 | 547 | |
d7f3f621 BL |
548 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
549 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
550 | ||
551 | /* | |
552 | * This is an encapsulation socket so pass the skb to | |
553 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
554 | * fall through and pass this up the UDP socket. | |
555 | * up->encap_rcv() returns the following value: | |
556 | * =0 if skb was successfully passed to the encap | |
557 | * handler or was discarded by it. | |
558 | * >0 if skb should be passed on to UDP. | |
559 | * <0 if skb should be resubmitted as proto -N | |
560 | */ | |
561 | ||
562 | /* if we're overly short, let UDP handle it */ | |
563 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
564 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
565 | int ret; | |
566 | ||
567 | ret = encap_rcv(sk, skb); | |
568 | if (ret <= 0) { | |
569 | UDP_INC_STATS_BH(sock_net(sk), | |
570 | UDP_MIB_INDATAGRAMS, | |
571 | is_udplite); | |
572 | return -ret; | |
573 | } | |
574 | } | |
575 | ||
576 | /* FALLTHROUGH -- it's a UDP Packet */ | |
577 | } | |
578 | ||
ba4e58ec GR |
579 | /* |
580 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
581 | */ | |
b2bf1e26 | 582 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
583 | |
584 | if (up->pcrlen == 0) { /* full coverage was set */ | |
585 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
586 | " %d while full coverage %d requested\n", | |
587 | UDP_SKB_CB(skb)->cscov, skb->len); | |
588 | goto drop; | |
589 | } | |
590 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
591 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
592 | "too small, need min %d\n", | |
593 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
594 | goto drop; | |
595 | } | |
1da177e4 LT |
596 | } |
597 | ||
33d480ce | 598 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 HX |
599 | if (udp_lib_checksum_complete(skb)) |
600 | goto drop; | |
601 | } | |
ba4e58ec | 602 | |
cb80ef46 BL |
603 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
604 | goto drop; | |
605 | ||
d826eb14 | 606 | skb_dst_drop(skb); |
cb75994e | 607 | |
cb80ef46 BL |
608 | bh_lock_sock(sk); |
609 | rc = 0; | |
610 | if (!sock_owned_by_user(sk)) | |
611 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
612 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
613 | bh_unlock_sock(sk); | |
614 | goto drop; | |
615 | } | |
616 | bh_unlock_sock(sk); | |
f7ad74fe BL |
617 | |
618 | return rc; | |
ba4e58ec | 619 | drop: |
ef28d1a2 | 620 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 621 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
622 | kfree_skb(skb); |
623 | return -1; | |
1da177e4 LT |
624 | } |
625 | ||
920a4611 | 626 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
b71d1d42 ED |
627 | __be16 loc_port, const struct in6_addr *loc_addr, |
628 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
1da177e4 LT |
629 | int dif) |
630 | { | |
88ab1932 | 631 | struct hlist_nulls_node *node; |
1da177e4 LT |
632 | struct sock *s = sk; |
633 | unsigned short num = ntohs(loc_port); | |
634 | ||
88ab1932 | 635 | sk_nulls_for_each_from(s, node) { |
1da177e4 LT |
636 | struct inet_sock *inet = inet_sk(s); |
637 | ||
920a4611 | 638 | if (!net_eq(sock_net(s), net)) |
b8ad0cbc DL |
639 | continue; |
640 | ||
d4cada4a ED |
641 | if (udp_sk(s)->udp_port_hash == num && |
642 | s->sk_family == PF_INET6) { | |
1da177e4 | 643 | struct ipv6_pinfo *np = inet6_sk(s); |
c720c7e8 ED |
644 | if (inet->inet_dport) { |
645 | if (inet->inet_dport != rmt_port) | |
1da177e4 LT |
646 | continue; |
647 | } | |
648 | if (!ipv6_addr_any(&np->daddr) && | |
649 | !ipv6_addr_equal(&np->daddr, rmt_addr)) | |
650 | continue; | |
651 | ||
652 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) | |
653 | continue; | |
654 | ||
655 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
40796c5e DS |
656 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
657 | continue; | |
1da177e4 | 658 | } |
add459aa | 659 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
1da177e4 LT |
660 | continue; |
661 | return s; | |
662 | } | |
663 | } | |
664 | return NULL; | |
665 | } | |
666 | ||
a1ab77f9 ED |
667 | static void flush_stack(struct sock **stack, unsigned int count, |
668 | struct sk_buff *skb, unsigned int final) | |
669 | { | |
cb80ef46 | 670 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 671 | struct sock *sk; |
cb80ef46 | 672 | unsigned int i; |
a1ab77f9 ED |
673 | |
674 | for (i = 0; i < count; i++) { | |
f6b8f32c | 675 | sk = stack[i]; |
cb80ef46 BL |
676 | if (likely(skb1 == NULL)) |
677 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
678 | if (!skb1) { | |
679 | atomic_inc(&sk->sk_drops); | |
680 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
681 | IS_UDPLITE(sk)); | |
682 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
683 | IS_UDPLITE(sk)); | |
a1ab77f9 | 684 | } |
cb80ef46 BL |
685 | |
686 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
687 | skb1 = NULL; | |
a1ab77f9 | 688 | } |
cb80ef46 BL |
689 | if (unlikely(skb1)) |
690 | kfree_skb(skb1); | |
a1ab77f9 | 691 | } |
1da177e4 LT |
692 | /* |
693 | * Note: called only from the BH handler context, | |
694 | * so we don't need to lock the hashes. | |
695 | */ | |
e3163493 | 696 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 697 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
645ca708 | 698 | struct udp_table *udptable) |
1da177e4 | 699 | { |
a1ab77f9 | 700 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 701 | const struct udphdr *uh = udp_hdr(skb); |
f86dcc5a | 702 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
1da177e4 | 703 | int dif; |
a1ab77f9 | 704 | unsigned int i, count = 0; |
1da177e4 | 705 | |
645ca708 | 706 | spin_lock(&hslot->lock); |
88ab1932 | 707 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 708 | dif = inet6_iif(skb); |
920a4611 | 709 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
a1ab77f9 ED |
710 | while (sk) { |
711 | stack[count++] = sk; | |
712 | sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, | |
713 | uh->source, saddr, dif); | |
714 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
715 | if (!sk) | |
716 | break; | |
717 | flush_stack(stack, count, skb, ~0); | |
718 | count = 0; | |
95766fff | 719 | } |
1da177e4 | 720 | } |
a1ab77f9 ED |
721 | /* |
722 | * before releasing the lock, we must take reference on sockets | |
723 | */ | |
724 | for (i = 0; i < count; i++) | |
725 | sock_hold(stack[i]); | |
726 | ||
645ca708 | 727 | spin_unlock(&hslot->lock); |
a1ab77f9 ED |
728 | |
729 | if (count) { | |
730 | flush_stack(stack, count, skb, count - 1); | |
731 | ||
732 | for (i = 0; i < count; i++) | |
733 | sock_put(stack[i]); | |
734 | } else { | |
735 | kfree_skb(skb); | |
736 | } | |
ba4e58ec | 737 | return 0; |
1da177e4 LT |
738 | } |
739 | ||
759e5d00 HX |
740 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
741 | int proto) | |
ba4e58ec | 742 | { |
759e5d00 HX |
743 | int err; |
744 | ||
745 | UDP_SKB_CB(skb)->partial_cov = 0; | |
746 | UDP_SKB_CB(skb)->cscov = skb->len; | |
747 | ||
db8dac20 | 748 | if (proto == IPPROTO_UDPLITE) { |
759e5d00 HX |
749 | err = udplite_checksum_init(skb, uh); |
750 | if (err) | |
751 | return err; | |
752 | } | |
753 | ||
ba4e58ec GR |
754 | if (uh->check == 0) { |
755 | /* RFC 2460 section 8.1 says that we SHOULD log | |
756 | this error. Well, it is reasonable. | |
757 | */ | |
758 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
759 | return 1; | |
760 | } | |
761 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
0660e03f | 762 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
759e5d00 | 763 | skb->len, proto, skb->csum)) |
ba4e58ec GR |
764 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
765 | ||
60476372 | 766 | if (!skb_csum_unnecessary(skb)) |
0660e03f ACM |
767 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
768 | &ipv6_hdr(skb)->daddr, | |
759e5d00 | 769 | skb->len, proto, 0)); |
ba4e58ec | 770 | |
759e5d00 | 771 | return 0; |
ba4e58ec GR |
772 | } |
773 | ||
645ca708 | 774 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 775 | int proto) |
1da177e4 | 776 | { |
3ffe533c | 777 | struct net *net = dev_net(skb->dev); |
1da177e4 | 778 | struct sock *sk; |
1ab1457c | 779 | struct udphdr *uh; |
b71d1d42 | 780 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
781 | u32 ulen = 0; |
782 | ||
783 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 784 | goto discard; |
1da177e4 | 785 | |
0660e03f ACM |
786 | saddr = &ipv6_hdr(skb)->saddr; |
787 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 788 | uh = udp_hdr(skb); |
1da177e4 LT |
789 | |
790 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
791 | if (ulen > skb->len) |
792 | goto short_packet; | |
1da177e4 | 793 | |
759e5d00 HX |
794 | if (proto == IPPROTO_UDP) { |
795 | /* UDP validates ulen. */ | |
1da177e4 | 796 | |
ba4e58ec GR |
797 | /* Check for jumbo payload */ |
798 | if (ulen == 0) | |
799 | ulen = skb->len; | |
1da177e4 | 800 | |
ba4e58ec GR |
801 | if (ulen < sizeof(*uh)) |
802 | goto short_packet; | |
1da177e4 | 803 | |
ba4e58ec GR |
804 | if (ulen < skb->len) { |
805 | if (pskb_trim_rcsum(skb, ulen)) | |
806 | goto short_packet; | |
0660e03f ACM |
807 | saddr = &ipv6_hdr(skb)->saddr; |
808 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 809 | uh = udp_hdr(skb); |
ba4e58ec | 810 | } |
ba4e58ec | 811 | } |
1da177e4 | 812 | |
759e5d00 HX |
813 | if (udp6_csum_init(skb, uh, proto)) |
814 | goto discard; | |
815 | ||
1ab1457c YH |
816 | /* |
817 | * Multicast receive code | |
1da177e4 | 818 | */ |
ba4e58ec | 819 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
820 | return __udp6_lib_mcast_deliver(net, skb, |
821 | saddr, daddr, udptable); | |
1da177e4 LT |
822 | |
823 | /* Unicast */ | |
824 | ||
1ab1457c | 825 | /* |
1da177e4 LT |
826 | * check socket cache ... must talk to Alan about his plans |
827 | * for sock caches... i'll skip this for now. | |
828 | */ | |
607c4aaf | 829 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
cb80ef46 BL |
830 | if (sk != NULL) { |
831 | int ret = udpv6_queue_rcv_skb(sk, skb); | |
832 | sock_put(sk); | |
1da177e4 | 833 | |
cb80ef46 BL |
834 | /* a return value > 0 means to resubmit the input, but |
835 | * it wants the return to be -protocol, or 0 | |
836 | */ | |
837 | if (ret > 0) | |
838 | return -ret; | |
1da177e4 | 839 | |
add459aa | 840 | return 0; |
1da177e4 | 841 | } |
1ab1457c | 842 | |
cb80ef46 | 843 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 844 | goto discard; |
cb80ef46 BL |
845 | |
846 | if (udp_lib_checksum_complete(skb)) | |
55349790 | 847 | goto discard; |
cb80ef46 BL |
848 | |
849 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
850 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
851 | ||
852 | kfree_skb(skb); | |
add459aa | 853 | return 0; |
1da177e4 | 854 | |
1ab1457c | 855 | short_packet: |
d6bc0149 | 856 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
db8dac20 | 857 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
d6bc0149 BM |
858 | saddr, |
859 | ntohs(uh->source), | |
860 | ulen, | |
861 | skb->len, | |
862 | daddr, | |
863 | ntohs(uh->dest)); | |
1da177e4 LT |
864 | |
865 | discard: | |
ef28d1a2 | 866 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 867 | kfree_skb(skb); |
add459aa | 868 | return 0; |
1da177e4 | 869 | } |
ba4e58ec | 870 | |
e5bbef20 | 871 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 872 | { |
645ca708 | 873 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
874 | } |
875 | ||
1da177e4 LT |
876 | /* |
877 | * Throw away all pending data and cancel the corking. Socket is locked. | |
878 | */ | |
879 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
880 | { | |
881 | struct udp_sock *up = udp_sk(sk); | |
882 | ||
36d926b9 DL |
883 | if (up->pending == AF_INET) |
884 | udp_flush_pending_frames(sk); | |
885 | else if (up->pending) { | |
1da177e4 LT |
886 | up->len = 0; |
887 | up->pending = 0; | |
888 | ip6_flush_pending_frames(sk); | |
1ab1457c | 889 | } |
1da177e4 LT |
890 | } |
891 | ||
493c6be3 SS |
892 | /** |
893 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming | |
894 | * @sk: socket we are sending on | |
895 | * @skb: sk_buff containing the filled-in UDP header | |
896 | * (checksum field must be zeroed out) | |
897 | */ | |
898 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
899 | const struct in6_addr *saddr, | |
900 | const struct in6_addr *daddr, int len) | |
901 | { | |
902 | unsigned int offset; | |
903 | struct udphdr *uh = udp_hdr(skb); | |
904 | __wsum csum = 0; | |
905 | ||
906 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
907 | /* Only one fragment on the socket. */ | |
908 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
909 | skb->csum_offset = offsetof(struct udphdr, check); | |
910 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
911 | } else { | |
912 | /* | |
913 | * HW-checksum won't work as there are two or more | |
914 | * fragments on the socket so that all csums of sk_buffs | |
915 | * should be together | |
916 | */ | |
917 | offset = skb_transport_offset(skb); | |
918 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
919 | ||
920 | skb->ip_summed = CHECKSUM_NONE; | |
921 | ||
922 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
923 | csum = csum_add(csum, skb->csum); | |
924 | } | |
925 | ||
926 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
927 | csum); | |
928 | if (uh->check == 0) | |
929 | uh->check = CSUM_MANGLED_0; | |
930 | } | |
931 | } | |
932 | ||
1da177e4 LT |
933 | /* |
934 | * Sending | |
935 | */ | |
936 | ||
4c0a6cb0 | 937 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
938 | { |
939 | struct sk_buff *skb; | |
940 | struct udphdr *uh; | |
4c0a6cb0 | 941 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 942 | struct inet_sock *inet = inet_sk(sk); |
4c9483b2 | 943 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1da177e4 | 944 | int err = 0; |
b2bf1e26 | 945 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 946 | __wsum csum = 0; |
1da177e4 LT |
947 | |
948 | /* Grab the skbuff where UDP header space exists. */ | |
949 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
950 | goto out; | |
951 | ||
952 | /* | |
953 | * Create a UDP header | |
954 | */ | |
4bedb452 | 955 | uh = udp_hdr(skb); |
1958b856 DM |
956 | uh->source = fl6->fl6_sport; |
957 | uh->dest = fl6->fl6_dport; | |
1da177e4 LT |
958 | uh->len = htons(up->len); |
959 | uh->check = 0; | |
960 | ||
b2bf1e26 | 961 | if (is_udplite) |
ba4e58ec | 962 | csum = udplite_csum_outgoing(sk, skb); |
493c6be3 | 963 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
4c9483b2 | 964 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, |
493c6be3 SS |
965 | up->len); |
966 | goto send; | |
967 | } else | |
ba4e58ec | 968 | csum = udp_csum_outgoing(sk, skb); |
1da177e4 | 969 | |
ba4e58ec | 970 | /* add protocol-dependent pseudo-header */ |
4c9483b2 DM |
971 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
972 | up->len, fl6->flowi6_proto, csum); | |
1da177e4 | 973 | if (uh->check == 0) |
f6ab0288 | 974 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 975 | |
493c6be3 | 976 | send: |
1da177e4 | 977 | err = ip6_push_pending_frames(sk); |
6ce9e7b5 ED |
978 | if (err) { |
979 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
980 | UDP6_INC_STATS_USER(sock_net(sk), | |
981 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
982 | err = 0; | |
983 | } | |
984 | } else | |
985 | UDP6_INC_STATS_USER(sock_net(sk), | |
986 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
987 | out: |
988 | up->len = 0; | |
989 | up->pending = 0; | |
990 | return err; | |
991 | } | |
992 | ||
ba4e58ec | 993 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
994 | struct msghdr *msg, size_t len) |
995 | { | |
996 | struct ipv6_txoptions opt_space; | |
997 | struct udp_sock *up = udp_sk(sk); | |
998 | struct inet_sock *inet = inet_sk(sk); | |
999 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1000 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
20c59de2 | 1001 | struct in6_addr *daddr, *final_p, final; |
1da177e4 LT |
1002 | struct ipv6_txoptions *opt = NULL; |
1003 | struct ip6_flowlabel *flowlabel = NULL; | |
4c9483b2 | 1004 | struct flowi6 fl6; |
1da177e4 LT |
1005 | struct dst_entry *dst; |
1006 | int addr_len = msg->msg_namelen; | |
1007 | int ulen = len; | |
1008 | int hlimit = -1; | |
41a1f8ea | 1009 | int tclass = -1; |
13b52cd4 | 1010 | int dontfrag = -1; |
1da177e4 LT |
1011 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1012 | int err; | |
987905de | 1013 | int connected = 0; |
b2bf1e26 | 1014 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1015 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1016 | |
1017 | /* destination address check */ | |
1018 | if (sin6) { | |
1019 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1020 | return -EINVAL; | |
1021 | ||
1022 | switch (sin6->sin6_family) { | |
1023 | case AF_INET6: | |
1024 | if (addr_len < SIN6_LEN_RFC2133) | |
1025 | return -EINVAL; | |
1026 | daddr = &sin6->sin6_addr; | |
1027 | break; | |
1028 | case AF_INET: | |
1029 | goto do_udp_sendmsg; | |
1030 | case AF_UNSPEC: | |
1031 | msg->msg_name = sin6 = NULL; | |
1032 | msg->msg_namelen = addr_len = 0; | |
1033 | daddr = NULL; | |
1034 | break; | |
1035 | default: | |
1036 | return -EINVAL; | |
1037 | } | |
1038 | } else if (!up->pending) { | |
1039 | if (sk->sk_state != TCP_ESTABLISHED) | |
1040 | return -EDESTADDRREQ; | |
1041 | daddr = &np->daddr; | |
1ab1457c | 1042 | } else |
1da177e4 LT |
1043 | daddr = NULL; |
1044 | ||
1045 | if (daddr) { | |
e773e4fa | 1046 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1047 | struct sockaddr_in sin; |
1048 | sin.sin_family = AF_INET; | |
c720c7e8 | 1049 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1050 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1051 | msg->msg_name = &sin; | |
1052 | msg->msg_namelen = sizeof(sin); | |
1053 | do_udp_sendmsg: | |
1054 | if (__ipv6_only_sock(sk)) | |
1055 | return -ENETUNREACH; | |
1056 | return udp_sendmsg(iocb, sk, msg, len); | |
1057 | } | |
1058 | } | |
1059 | ||
1060 | if (up->pending == AF_INET) | |
1061 | return udp_sendmsg(iocb, sk, msg, len); | |
1062 | ||
1063 | /* Rough check on arithmetic overflow, | |
b59e139b | 1064 | better check is made in ip6_append_data(). |
1da177e4 LT |
1065 | */ |
1066 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1067 | return -EMSGSIZE; | |
1ab1457c | 1068 | |
1da177e4 LT |
1069 | if (up->pending) { |
1070 | /* | |
1071 | * There are pending frames. | |
1072 | * The socket lock must be held while it's corked. | |
1073 | */ | |
1074 | lock_sock(sk); | |
1075 | if (likely(up->pending)) { | |
1076 | if (unlikely(up->pending != AF_INET6)) { | |
1077 | release_sock(sk); | |
1078 | return -EAFNOSUPPORT; | |
1079 | } | |
1080 | dst = NULL; | |
1081 | goto do_append_data; | |
1082 | } | |
1083 | release_sock(sk); | |
1084 | } | |
1085 | ulen += sizeof(struct udphdr); | |
1086 | ||
4c9483b2 | 1087 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1088 | |
1089 | if (sin6) { | |
1090 | if (sin6->sin6_port == 0) | |
1091 | return -EINVAL; | |
1092 | ||
1958b856 | 1093 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1094 | daddr = &sin6->sin6_addr; |
1095 | ||
1096 | if (np->sndflow) { | |
4c9483b2 DM |
1097 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1098 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1099 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1100 | if (flowlabel == NULL) |
1101 | return -EINVAL; | |
1102 | daddr = &flowlabel->dst; | |
1103 | } | |
1104 | } | |
1105 | ||
1106 | /* | |
1107 | * Otherwise it will be difficult to maintain | |
1108 | * sk->sk_dst_cache. | |
1109 | */ | |
1110 | if (sk->sk_state == TCP_ESTABLISHED && | |
1111 | ipv6_addr_equal(daddr, &np->daddr)) | |
1112 | daddr = &np->daddr; | |
1113 | ||
1114 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1115 | sin6->sin6_scope_id && | |
1116 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) | |
4c9483b2 | 1117 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1118 | } else { |
1119 | if (sk->sk_state != TCP_ESTABLISHED) | |
1120 | return -EDESTADDRREQ; | |
1121 | ||
1958b856 | 1122 | fl6.fl6_dport = inet->inet_dport; |
1da177e4 | 1123 | daddr = &np->daddr; |
4c9483b2 | 1124 | fl6.flowlabel = np->flow_label; |
987905de | 1125 | connected = 1; |
1da177e4 LT |
1126 | } |
1127 | ||
4c9483b2 DM |
1128 | if (!fl6.flowi6_oif) |
1129 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1130 | |
4c9483b2 DM |
1131 | if (!fl6.flowi6_oif) |
1132 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1133 | |
4c9483b2 | 1134 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1135 | |
1da177e4 LT |
1136 | if (msg->msg_controllen) { |
1137 | opt = &opt_space; | |
1138 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1139 | opt->tot_len = sizeof(*opt); | |
1140 | ||
ec0506db MÅ» |
1141 | err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1142 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1143 | if (err < 0) { |
1144 | fl6_sock_release(flowlabel); | |
1145 | return err; | |
1146 | } | |
4c9483b2 DM |
1147 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1148 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1149 | if (flowlabel == NULL) |
1150 | return -EINVAL; | |
1151 | } | |
1152 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1153 | opt = NULL; | |
987905de | 1154 | connected = 0; |
1da177e4 LT |
1155 | } |
1156 | if (opt == NULL) | |
1157 | opt = np->opt; | |
df9890c3 YH |
1158 | if (flowlabel) |
1159 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1160 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1161 | |
4c9483b2 | 1162 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1163 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1164 | fl6.daddr = *daddr; |
876c7f41 | 1165 | else |
4c9483b2 DM |
1166 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1167 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1168 | fl6.saddr = np->saddr; |
1958b856 | 1169 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1170 | |
4c9483b2 | 1171 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1172 | if (final_p) |
987905de | 1173 | connected = 0; |
1da177e4 | 1174 | |
4c9483b2 DM |
1175 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1176 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1177 | connected = 0; |
c4062dfc EH |
1178 | } else if (!fl6.flowi6_oif) |
1179 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1180 | |
4c9483b2 | 1181 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1182 | |
4c9483b2 | 1183 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
1184 | if (IS_ERR(dst)) { |
1185 | err = PTR_ERR(dst); | |
1186 | dst = NULL; | |
1da177e4 | 1187 | goto out; |
14e50e57 | 1188 | } |
1da177e4 LT |
1189 | |
1190 | if (hlimit < 0) { | |
4c9483b2 | 1191 | if (ipv6_addr_is_multicast(&fl6.daddr)) |
1da177e4 LT |
1192 | hlimit = np->mcast_hops; |
1193 | else | |
1194 | hlimit = np->hop_limit; | |
1195 | if (hlimit < 0) | |
6b75d090 | 1196 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 LT |
1197 | } |
1198 | ||
e651f03a | 1199 | if (tclass < 0) |
41a1f8ea | 1200 | tclass = np->tclass; |
41a1f8ea | 1201 | |
13b52cd4 BH |
1202 | if (dontfrag < 0) |
1203 | dontfrag = np->dontfrag; | |
1204 | ||
1da177e4 LT |
1205 | if (msg->msg_flags&MSG_CONFIRM) |
1206 | goto do_confirm; | |
1207 | back_from_confirm: | |
1208 | ||
1209 | lock_sock(sk); | |
1210 | if (unlikely(up->pending)) { | |
1211 | /* The socket is already corked while preparing it. */ | |
1212 | /* ... which is an evident application bug. --ANK */ | |
1213 | release_sock(sk); | |
1214 | ||
64ce2073 | 1215 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
1216 | err = -EINVAL; |
1217 | goto out; | |
1218 | } | |
1219 | ||
1220 | up->pending = AF_INET6; | |
1221 | ||
1222 | do_append_data: | |
1223 | up->len += ulen; | |
ba4e58ec GR |
1224 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1225 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
4c9483b2 | 1226 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
41a1f8ea | 1227 | (struct rt6_info*)dst, |
13b52cd4 | 1228 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1229 | if (err) |
1230 | udp_v6_flush_pending_frames(sk); | |
1231 | else if (!corkreq) | |
4c0a6cb0 | 1232 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1233 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1234 | up->pending = 0; | |
1da177e4 | 1235 | |
a5e7c210 DM |
1236 | if (dst) { |
1237 | if (connected) { | |
1238 | ip6_dst_store(sk, dst, | |
4c9483b2 | 1239 | ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
8e1ef0a9 YH |
1240 | &np->daddr : NULL, |
1241 | #ifdef CONFIG_IPV6_SUBTREES | |
4c9483b2 | 1242 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1243 | &np->saddr : |
1244 | #endif | |
1245 | NULL); | |
a5e7c210 DM |
1246 | } else { |
1247 | dst_release(dst); | |
1248 | } | |
a3c96089 | 1249 | dst = NULL; |
a5e7c210 DM |
1250 | } |
1251 | ||
1da177e4 LT |
1252 | if (err > 0) |
1253 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1254 | release_sock(sk); | |
1255 | out: | |
a3c96089 | 1256 | dst_release(dst); |
1da177e4 | 1257 | fl6_sock_release(flowlabel); |
cd562c98 | 1258 | if (!err) |
1da177e4 | 1259 | return len; |
a18135eb DM |
1260 | /* |
1261 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1262 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1263 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1264 | * things). We could add another new stat but at least for now that | |
1265 | * seems like overkill. | |
1266 | */ | |
1267 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1268 | UDP6_INC_STATS_USER(sock_net(sk), |
1269 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1270 | } |
1da177e4 LT |
1271 | return err; |
1272 | ||
1273 | do_confirm: | |
1274 | dst_confirm(dst); | |
1275 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1276 | goto back_from_confirm; | |
1277 | err = 0; | |
1278 | goto out; | |
1279 | } | |
1280 | ||
7d06b2e0 | 1281 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 LT |
1282 | { |
1283 | lock_sock(sk); | |
1284 | udp_v6_flush_pending_frames(sk); | |
1285 | release_sock(sk); | |
1286 | ||
1287 | inet6_destroy_sock(sk); | |
1da177e4 LT |
1288 | } |
1289 | ||
1290 | /* | |
1291 | * Socket option code for UDP | |
1292 | */ | |
ba4e58ec | 1293 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1294 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1295 | { |
db8dac20 | 1296 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1297 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1298 | udp_v6_push_pending_frames); | |
ba4e58ec | 1299 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1300 | } |
1301 | ||
1302 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1303 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1304 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1305 | { |
db8dac20 | 1306 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1307 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1308 | udp_v6_push_pending_frames); | |
ba4e58ec | 1309 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1310 | } |
1311 | #endif | |
1312 | ||
ba4e58ec GR |
1313 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1314 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1315 | { |
db8dac20 | 1316 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1317 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1318 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1319 | } |
1320 | ||
1321 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1322 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1323 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1324 | { |
db8dac20 | 1325 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1326 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1327 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1328 | } |
1329 | #endif | |
1330 | ||
ba735425 SS |
1331 | static int udp6_ufo_send_check(struct sk_buff *skb) |
1332 | { | |
b71d1d42 | 1333 | const struct ipv6hdr *ipv6h; |
ba735425 SS |
1334 | struct udphdr *uh; |
1335 | ||
1336 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
1337 | return -EINVAL; | |
1338 | ||
1339 | ipv6h = ipv6_hdr(skb); | |
1340 | uh = udp_hdr(skb); | |
1341 | ||
1342 | uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
1343 | IPPROTO_UDP, 0); | |
1344 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1345 | skb->csum_offset = offsetof(struct udphdr, check); | |
1346 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1347 | return 0; | |
1348 | } | |
1349 | ||
c8f44aff MM |
1350 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, |
1351 | netdev_features_t features) | |
ba735425 SS |
1352 | { |
1353 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1354 | unsigned int mss; | |
1355 | unsigned int unfrag_ip6hlen, unfrag_len; | |
1356 | struct frag_hdr *fptr; | |
1357 | u8 *mac_start, *prevhdr; | |
1358 | u8 nexthdr; | |
1359 | u8 frag_hdr_sz = sizeof(struct frag_hdr); | |
1360 | int offset; | |
1361 | __wsum csum; | |
1362 | ||
1363 | mss = skb_shinfo(skb)->gso_size; | |
1364 | if (unlikely(skb->len <= mss)) | |
1365 | goto out; | |
1366 | ||
1367 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
1368 | /* Packet is from an untrusted source, reset gso_segs. */ | |
1369 | int type = skb_shinfo(skb)->gso_type; | |
1370 | ||
1371 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
1372 | !(type & (SKB_GSO_UDP)))) | |
1373 | goto out; | |
1374 | ||
1375 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
1376 | ||
1377 | segs = NULL; | |
1378 | goto out; | |
1379 | } | |
1380 | ||
1381 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
1382 | * do checksum of UDP packets sent as multiple IP fragments. | |
1383 | */ | |
96339d6c | 1384 | offset = skb_checksum_start_offset(skb); |
3dde2598 | 1385 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
ba735425 SS |
1386 | offset += skb->csum_offset; |
1387 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
1388 | skb->ip_summed = CHECKSUM_NONE; | |
1389 | ||
1390 | /* Check if there is enough headroom to insert fragment header. */ | |
a9cf73ea | 1391 | if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) && |
ba735425 SS |
1392 | pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) |
1393 | goto out; | |
1394 | ||
1395 | /* Find the unfragmentable header and shift it left by frag_hdr_sz | |
1396 | * bytes to insert fragment header. | |
1397 | */ | |
1398 | unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
1399 | nexthdr = *prevhdr; | |
1400 | *prevhdr = NEXTHDR_FRAGMENT; | |
1401 | unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + | |
1402 | unfrag_ip6hlen; | |
1403 | mac_start = skb_mac_header(skb); | |
1404 | memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); | |
1405 | ||
1406 | skb->mac_header -= frag_hdr_sz; | |
1407 | skb->network_header -= frag_hdr_sz; | |
1408 | ||
1409 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); | |
1410 | fptr->nexthdr = nexthdr; | |
1411 | fptr->reserved = 0; | |
87c48fa3 | 1412 | ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); |
ba735425 SS |
1413 | |
1414 | /* Fragment the skb. ipv6 header and the remaining fields of the | |
1415 | * fragment header are updated in ipv6_gso_segment() | |
1416 | */ | |
1417 | segs = skb_segment(skb, features); | |
1418 | ||
1419 | out: | |
1420 | return segs; | |
1421 | } | |
1422 | ||
41135cc8 | 1423 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1424 | .handler = udpv6_rcv, |
1425 | .err_handler = udpv6_err, | |
ba735425 SS |
1426 | .gso_send_check = udp6_ufo_send_check, |
1427 | .gso_segment = udp6_ufo_fragment, | |
1da177e4 LT |
1428 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, |
1429 | }; | |
1430 | ||
1431 | /* ------------------------------------------------------------------------ */ | |
1432 | #ifdef CONFIG_PROC_FS | |
1433 | ||
1434 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) | |
1435 | { | |
1436 | struct inet_sock *inet = inet_sk(sp); | |
1437 | struct ipv6_pinfo *np = inet6_sk(sp); | |
b71d1d42 | 1438 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1439 | __u16 destp, srcp; |
1440 | ||
1441 | dest = &np->daddr; | |
1442 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1443 | destp = ntohs(inet->inet_dport); |
1444 | srcp = ntohs(inet->inet_sport); | |
1da177e4 | 1445 | seq_printf(seq, |
f86dcc5a | 1446 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
71338aa7 | 1447 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", |
1da177e4 LT |
1448 | bucket, |
1449 | src->s6_addr32[0], src->s6_addr32[1], | |
1450 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1451 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1452 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1453 | sp->sk_state, |
31e6d363 ED |
1454 | sk_wmem_alloc_get(sp), |
1455 | sk_rmem_alloc_get(sp), | |
1da177e4 LT |
1456 | 0, 0L, 0, |
1457 | sock_i_uid(sp), 0, | |
1458 | sock_i_ino(sp), | |
cb61cb9b ED |
1459 | atomic_read(&sp->sk_refcnt), sp, |
1460 | atomic_read(&sp->sk_drops)); | |
1da177e4 LT |
1461 | } |
1462 | ||
ba4e58ec | 1463 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1464 | { |
1465 | if (v == SEQ_START_TOKEN) | |
1466 | seq_printf(seq, | |
1467 | " sl " | |
1468 | "local_address " | |
1469 | "remote_address " | |
1470 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
cb61cb9b | 1471 | " uid timeout inode ref pointer drops\n"); |
1da177e4 LT |
1472 | else |
1473 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); | |
1474 | return 0; | |
1475 | } | |
1476 | ||
73cb88ec AV |
1477 | static const struct file_operations udp6_afinfo_seq_fops = { |
1478 | .owner = THIS_MODULE, | |
1479 | .open = udp_seq_open, | |
1480 | .read = seq_read, | |
1481 | .llseek = seq_lseek, | |
1482 | .release = seq_release_net | |
1483 | }; | |
1484 | ||
1da177e4 | 1485 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1486 | .name = "udp6", |
1487 | .family = AF_INET6, | |
645ca708 | 1488 | .udp_table = &udp_table, |
73cb88ec | 1489 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1490 | .seq_ops = { |
1491 | .show = udp6_seq_show, | |
1492 | }, | |
1da177e4 LT |
1493 | }; |
1494 | ||
2c8c1e72 | 1495 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1496 | { |
0c96d8c5 | 1497 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1498 | } |
1499 | ||
0c96d8c5 DL |
1500 | void udp6_proc_exit(struct net *net) { |
1501 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1502 | } |
1503 | #endif /* CONFIG_PROC_FS */ | |
1504 | ||
1505 | /* ------------------------------------------------------------------------ */ | |
1506 | ||
1507 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1508 | .name = "UDPv6", |
1509 | .owner = THIS_MODULE, | |
ba4e58ec | 1510 | .close = udp_lib_close, |
543d9cfe ACM |
1511 | .connect = ip6_datagram_connect, |
1512 | .disconnect = udp_disconnect, | |
1513 | .ioctl = udp_ioctl, | |
1514 | .destroy = udpv6_destroy_sock, | |
1515 | .setsockopt = udpv6_setsockopt, | |
1516 | .getsockopt = udpv6_getsockopt, | |
1517 | .sendmsg = udpv6_sendmsg, | |
1518 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1519 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1520 | .hash = udp_lib_hash, |
1521 | .unhash = udp_lib_unhash, | |
719f8358 | 1522 | .rehash = udp_v6_rehash, |
543d9cfe | 1523 | .get_port = udp_v6_get_port, |
95766fff HA |
1524 | .memory_allocated = &udp_memory_allocated, |
1525 | .sysctl_mem = sysctl_udp_mem, | |
1526 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1527 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1528 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1529 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1530 | .h.udp_table = &udp_table, |
3fdadf7d | 1531 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1532 | .compat_setsockopt = compat_udpv6_setsockopt, |
1533 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1534 | #endif |
fcbdf09d | 1535 | .clear_sk = sk_prot_clear_portaddr_nulls, |
1da177e4 LT |
1536 | }; |
1537 | ||
1da177e4 LT |
1538 | static struct inet_protosw udpv6_protosw = { |
1539 | .type = SOCK_DGRAM, | |
1540 | .protocol = IPPROTO_UDP, | |
1541 | .prot = &udpv6_prot, | |
1542 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1543 | .no_check = UDP_CSUM_DEFAULT, |
1544 | .flags = INET_PROTOSW_PERMANENT, | |
1545 | }; | |
1546 | ||
1547 | ||
7f4e4868 | 1548 | int __init udpv6_init(void) |
1da177e4 | 1549 | { |
7f4e4868 DL |
1550 | int ret; |
1551 | ||
1552 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1553 | if (ret) | |
1554 | goto out; | |
1555 | ||
1556 | ret = inet6_register_protosw(&udpv6_protosw); | |
1557 | if (ret) | |
1558 | goto out_udpv6_protocol; | |
1559 | out: | |
1560 | return ret; | |
1561 | ||
1562 | out_udpv6_protocol: | |
1563 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1564 | goto out; | |
1565 | } | |
1566 | ||
09f7709f | 1567 | void udpv6_exit(void) |
7f4e4868 DL |
1568 | { |
1569 | inet6_unregister_protosw(&udpv6_protosw); | |
1570 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
1da177e4 | 1571 | } |