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Commit | Line | Data |
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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> | |
22911fc5 | 51 | #include <trace/events/skb.h> |
ba4e58ec | 52 | #include "udp_impl.h" |
1da177e4 | 53 | |
b2f5e7cd VY |
54 | int ipv6_rcv_saddr_equal(const struct sock *sk, const struct sock *sk2) |
55 | { | |
56 | const struct in6_addr *sk_rcv_saddr6 = &inet6_sk(sk)->rcv_saddr; | |
57 | const struct in6_addr *sk2_rcv_saddr6 = inet6_rcv_saddr(sk2); | |
68835aba ED |
58 | __be32 sk1_rcv_saddr = sk_rcv_saddr(sk); |
59 | __be32 sk2_rcv_saddr = sk_rcv_saddr(sk2); | |
b2f5e7cd VY |
60 | int sk_ipv6only = ipv6_only_sock(sk); |
61 | int sk2_ipv6only = inet_v6_ipv6only(sk2); | |
62 | int addr_type = ipv6_addr_type(sk_rcv_saddr6); | |
63 | int addr_type2 = sk2_rcv_saddr6 ? ipv6_addr_type(sk2_rcv_saddr6) : IPV6_ADDR_MAPPED; | |
64 | ||
65 | /* if both are mapped, treat as IPv4 */ | |
66 | if (addr_type == IPV6_ADDR_MAPPED && addr_type2 == IPV6_ADDR_MAPPED) | |
499923c7 | 67 | return (!sk2_ipv6only && |
c720c7e8 ED |
68 | (!sk1_rcv_saddr || !sk2_rcv_saddr || |
69 | sk1_rcv_saddr == sk2_rcv_saddr)); | |
b2f5e7cd VY |
70 | |
71 | if (addr_type2 == IPV6_ADDR_ANY && | |
72 | !(sk2_ipv6only && addr_type == IPV6_ADDR_MAPPED)) | |
73 | return 1; | |
74 | ||
75 | if (addr_type == IPV6_ADDR_ANY && | |
76 | !(sk_ipv6only && addr_type2 == IPV6_ADDR_MAPPED)) | |
77 | return 1; | |
78 | ||
79 | if (sk2_rcv_saddr6 && | |
80 | ipv6_addr_equal(sk_rcv_saddr6, sk2_rcv_saddr6)) | |
81 | return 1; | |
82 | ||
83 | return 0; | |
84 | } | |
85 | ||
d4cada4a ED |
86 | static unsigned int udp6_portaddr_hash(struct net *net, |
87 | const struct in6_addr *addr6, | |
88 | unsigned int port) | |
89 | { | |
90 | unsigned int hash, mix = net_hash_mix(net); | |
91 | ||
92 | if (ipv6_addr_any(addr6)) | |
93 | hash = jhash_1word(0, mix); | |
856540ee | 94 | else if (ipv6_addr_v4mapped(addr6)) |
0eae88f3 | 95 | hash = jhash_1word((__force u32)addr6->s6_addr32[3], mix); |
d4cada4a | 96 | else |
0eae88f3 | 97 | hash = jhash2((__force u32 *)addr6->s6_addr32, 4, mix); |
d4cada4a ED |
98 | |
99 | return hash ^ port; | |
100 | } | |
101 | ||
102 | ||
6ba5a3c5 | 103 | int udp_v6_get_port(struct sock *sk, unsigned short snum) |
1da177e4 | 104 | { |
30fff923 ED |
105 | unsigned int hash2_nulladdr = |
106 | udp6_portaddr_hash(sock_net(sk), &in6addr_any, snum); | |
9a52e97e | 107 | unsigned int hash2_partial = |
30fff923 ED |
108 | udp6_portaddr_hash(sock_net(sk), &inet6_sk(sk)->rcv_saddr, 0); |
109 | ||
d4cada4a | 110 | /* precompute partial secondary hash */ |
30fff923 ED |
111 | udp_sk(sk)->udp_portaddr_hash = hash2_partial; |
112 | return udp_lib_get_port(sk, snum, ipv6_rcv_saddr_equal, hash2_nulladdr); | |
1da177e4 LT |
113 | } |
114 | ||
719f8358 ED |
115 | static void udp_v6_rehash(struct sock *sk) |
116 | { | |
117 | u16 new_hash = udp6_portaddr_hash(sock_net(sk), | |
118 | &inet6_sk(sk)->rcv_saddr, | |
119 | inet_sk(sk)->inet_num); | |
120 | ||
121 | udp_lib_rehash(sk, new_hash); | |
122 | } | |
123 | ||
645ca708 ED |
124 | static inline int compute_score(struct sock *sk, struct net *net, |
125 | unsigned short hnum, | |
88440ae7 BS |
126 | const struct in6_addr *saddr, __be16 sport, |
127 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 ED |
128 | int dif) |
129 | { | |
130 | int score = -1; | |
131 | ||
d4cada4a | 132 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && |
645ca708 ED |
133 | sk->sk_family == PF_INET6) { |
134 | struct ipv6_pinfo *np = inet6_sk(sk); | |
135 | struct inet_sock *inet = inet_sk(sk); | |
136 | ||
137 | score = 0; | |
c720c7e8 ED |
138 | if (inet->inet_dport) { |
139 | if (inet->inet_dport != sport) | |
645ca708 ED |
140 | return -1; |
141 | score++; | |
142 | } | |
143 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
144 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
145 | return -1; | |
146 | score++; | |
147 | } | |
148 | if (!ipv6_addr_any(&np->daddr)) { | |
149 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
150 | return -1; | |
151 | score++; | |
152 | } | |
153 | if (sk->sk_bound_dev_if) { | |
154 | if (sk->sk_bound_dev_if != dif) | |
155 | return -1; | |
156 | score++; | |
157 | } | |
158 | } | |
159 | return score; | |
160 | } | |
161 | ||
fddc17de ED |
162 | #define SCORE2_MAX (1 + 1 + 1) |
163 | static inline int compute_score2(struct sock *sk, struct net *net, | |
164 | const struct in6_addr *saddr, __be16 sport, | |
165 | const struct in6_addr *daddr, unsigned short hnum, | |
166 | int dif) | |
167 | { | |
168 | int score = -1; | |
169 | ||
170 | if (net_eq(sock_net(sk), net) && udp_sk(sk)->udp_port_hash == hnum && | |
171 | sk->sk_family == PF_INET6) { | |
172 | struct ipv6_pinfo *np = inet6_sk(sk); | |
173 | struct inet_sock *inet = inet_sk(sk); | |
174 | ||
175 | if (!ipv6_addr_equal(&np->rcv_saddr, daddr)) | |
176 | return -1; | |
177 | score = 0; | |
178 | if (inet->inet_dport) { | |
179 | if (inet->inet_dport != sport) | |
180 | return -1; | |
181 | score++; | |
182 | } | |
183 | if (!ipv6_addr_any(&np->daddr)) { | |
184 | if (!ipv6_addr_equal(&np->daddr, saddr)) | |
185 | return -1; | |
186 | score++; | |
187 | } | |
188 | if (sk->sk_bound_dev_if) { | |
189 | if (sk->sk_bound_dev_if != dif) | |
190 | return -1; | |
191 | score++; | |
192 | } | |
193 | } | |
194 | return score; | |
195 | } | |
196 | ||
fddc17de ED |
197 | |
198 | /* called with read_rcu_lock() */ | |
199 | static struct sock *udp6_lib_lookup2(struct net *net, | |
200 | const struct in6_addr *saddr, __be16 sport, | |
201 | const struct in6_addr *daddr, unsigned int hnum, int dif, | |
202 | struct udp_hslot *hslot2, unsigned int slot2) | |
203 | { | |
204 | struct sock *sk, *result; | |
205 | struct hlist_nulls_node *node; | |
206 | int score, badness; | |
207 | ||
208 | begin: | |
209 | result = NULL; | |
210 | badness = -1; | |
211 | udp_portaddr_for_each_entry_rcu(sk, node, &hslot2->head) { | |
212 | score = compute_score2(sk, net, saddr, sport, | |
213 | daddr, hnum, dif); | |
214 | if (score > badness) { | |
215 | result = sk; | |
216 | badness = score; | |
217 | if (score == SCORE2_MAX) | |
218 | goto exact_match; | |
219 | } | |
220 | } | |
221 | /* | |
222 | * if the nulls value we got at the end of this lookup is | |
223 | * not the expected one, we must restart lookup. | |
224 | * We probably met an item that was moved to another chain. | |
225 | */ | |
226 | if (get_nulls_value(node) != slot2) | |
227 | goto begin; | |
228 | ||
229 | if (result) { | |
230 | exact_match: | |
c31504dc | 231 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
fddc17de ED |
232 | result = NULL; |
233 | else if (unlikely(compute_score2(result, net, saddr, sport, | |
234 | daddr, hnum, dif) < badness)) { | |
235 | sock_put(result); | |
236 | goto begin; | |
237 | } | |
238 | } | |
239 | return result; | |
240 | } | |
241 | ||
fce82338 | 242 | struct sock *__udp6_lib_lookup(struct net *net, |
88440ae7 BS |
243 | const struct in6_addr *saddr, __be16 sport, |
244 | const struct in6_addr *daddr, __be16 dport, | |
645ca708 | 245 | int dif, struct udp_table *udptable) |
1da177e4 | 246 | { |
271b72c7 | 247 | struct sock *sk, *result; |
88ab1932 | 248 | struct hlist_nulls_node *node; |
1da177e4 | 249 | unsigned short hnum = ntohs(dport); |
fddc17de ED |
250 | unsigned int hash2, slot2, slot = udp_hashfn(net, hnum, udptable->mask); |
251 | struct udp_hslot *hslot2, *hslot = &udptable->hash[slot]; | |
271b72c7 | 252 | int score, badness; |
645ca708 | 253 | |
271b72c7 | 254 | rcu_read_lock(); |
fddc17de ED |
255 | if (hslot->count > 10) { |
256 | hash2 = udp6_portaddr_hash(net, daddr, hnum); | |
257 | slot2 = hash2 & udptable->mask; | |
258 | hslot2 = &udptable->hash2[slot2]; | |
259 | if (hslot->count < hslot2->count) | |
260 | goto begin; | |
261 | ||
262 | result = udp6_lib_lookup2(net, saddr, sport, | |
263 | daddr, hnum, dif, | |
264 | hslot2, slot2); | |
265 | if (!result) { | |
266 | hash2 = udp6_portaddr_hash(net, &in6addr_any, hnum); | |
267 | slot2 = hash2 & udptable->mask; | |
268 | hslot2 = &udptable->hash2[slot2]; | |
269 | if (hslot->count < hslot2->count) | |
270 | goto begin; | |
271 | ||
1223c67c JBD |
272 | result = udp6_lib_lookup2(net, saddr, sport, |
273 | &in6addr_any, hnum, dif, | |
fddc17de ED |
274 | hslot2, slot2); |
275 | } | |
276 | rcu_read_unlock(); | |
277 | return result; | |
278 | } | |
271b72c7 ED |
279 | begin: |
280 | result = NULL; | |
281 | badness = -1; | |
88ab1932 | 282 | sk_nulls_for_each_rcu(sk, node, &hslot->head) { |
645ca708 ED |
283 | score = compute_score(sk, net, hnum, saddr, sport, daddr, dport, dif); |
284 | if (score > badness) { | |
285 | result = sk; | |
286 | badness = score; | |
1da177e4 LT |
287 | } |
288 | } | |
88ab1932 ED |
289 | /* |
290 | * if the nulls value we got at the end of this lookup is | |
291 | * not the expected one, we must restart lookup. | |
292 | * We probably met an item that was moved to another chain. | |
293 | */ | |
fddc17de | 294 | if (get_nulls_value(node) != slot) |
88ab1932 ED |
295 | goto begin; |
296 | ||
271b72c7 | 297 | if (result) { |
c31504dc | 298 | if (unlikely(!atomic_inc_not_zero_hint(&result->sk_refcnt, 2))) |
271b72c7 ED |
299 | result = NULL; |
300 | else if (unlikely(compute_score(result, net, hnum, saddr, sport, | |
301 | daddr, dport, dif) < badness)) { | |
302 | sock_put(result); | |
303 | goto begin; | |
304 | } | |
305 | } | |
306 | rcu_read_unlock(); | |
1da177e4 LT |
307 | return result; |
308 | } | |
fce82338 | 309 | EXPORT_SYMBOL_GPL(__udp6_lib_lookup); |
1da177e4 | 310 | |
607c4aaf KK |
311 | static struct sock *__udp6_lib_lookup_skb(struct sk_buff *skb, |
312 | __be16 sport, __be16 dport, | |
645ca708 | 313 | struct udp_table *udptable) |
607c4aaf | 314 | { |
23542618 | 315 | struct sock *sk; |
b71d1d42 | 316 | const struct ipv6hdr *iph = ipv6_hdr(skb); |
607c4aaf | 317 | |
23542618 KK |
318 | if (unlikely(sk = skb_steal_sock(skb))) |
319 | return sk; | |
adf30907 ED |
320 | return __udp6_lib_lookup(dev_net(skb_dst(skb)->dev), &iph->saddr, sport, |
321 | &iph->daddr, dport, inet6_iif(skb), | |
322 | udptable); | |
607c4aaf KK |
323 | } |
324 | ||
aa976fc0 BS |
325 | struct sock *udp6_lib_lookup(struct net *net, const struct in6_addr *saddr, __be16 sport, |
326 | const struct in6_addr *daddr, __be16 dport, int dif) | |
327 | { | |
328 | return __udp6_lib_lookup(net, saddr, sport, daddr, dport, dif, &udp_table); | |
329 | } | |
330 | EXPORT_SYMBOL_GPL(udp6_lib_lookup); | |
331 | ||
332 | ||
1da177e4 LT |
333 | /* |
334 | * This should be easy, if there is something there we | |
335 | * return it, otherwise we block. | |
336 | */ | |
337 | ||
ba4e58ec | 338 | int udpv6_recvmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
339 | struct msghdr *msg, size_t len, |
340 | int noblock, int flags, int *addr_len) | |
341 | { | |
342 | struct ipv6_pinfo *np = inet6_sk(sk); | |
343 | struct inet_sock *inet = inet_sk(sk); | |
1ab1457c | 344 | struct sk_buff *skb; |
59c2cdae | 345 | unsigned int ulen, copied; |
3f518bf7 | 346 | int peeked, off = 0; |
759e5d00 HX |
347 | int err; |
348 | int is_udplite = IS_UDPLITE(sk); | |
f26ba175 | 349 | int is_udp4; |
8a74ad60 | 350 | bool slow; |
1da177e4 | 351 | |
1ab1457c | 352 | if (addr_len) |
3dde2598 | 353 | *addr_len = sizeof(struct sockaddr_in6); |
1ab1457c | 354 | |
1da177e4 LT |
355 | if (flags & MSG_ERRQUEUE) |
356 | return ipv6_recv_error(sk, msg, len); | |
357 | ||
4b340ae2 BH |
358 | if (np->rxpmtu && np->rxopt.bits.rxpmtu) |
359 | return ipv6_recv_rxpmtu(sk, msg, len); | |
360 | ||
1da177e4 | 361 | try_again: |
a59322be | 362 | skb = __skb_recv_datagram(sk, flags | (noblock ? MSG_DONTWAIT : 0), |
3f518bf7 | 363 | &peeked, &off, &err); |
1da177e4 LT |
364 | if (!skb) |
365 | goto out; | |
366 | ||
759e5d00 | 367 | ulen = skb->len - sizeof(struct udphdr); |
59c2cdae DM |
368 | copied = len; |
369 | if (copied > ulen) | |
370 | copied = ulen; | |
371 | else if (copied < ulen) | |
1ab1457c | 372 | msg->msg_flags |= MSG_TRUNC; |
1da177e4 | 373 | |
f26ba175 WY |
374 | is_udp4 = (skb->protocol == htons(ETH_P_IP)); |
375 | ||
ba4e58ec | 376 | /* |
759e5d00 HX |
377 | * If checksum is needed at all, try to do it while copying the |
378 | * data. If the data is truncated, or if we only want a partial | |
379 | * coverage checksum (UDP-Lite), do it before the copy. | |
ba4e58ec | 380 | */ |
ba4e58ec | 381 | |
59c2cdae | 382 | if (copied < ulen || UDP_SKB_CB(skb)->partial_cov) { |
759e5d00 | 383 | if (udp_lib_checksum_complete(skb)) |
1da177e4 | 384 | goto csum_copy_err; |
ba4e58ec GR |
385 | } |
386 | ||
60476372 | 387 | if (skb_csum_unnecessary(skb)) |
ba4e58ec | 388 | err = skb_copy_datagram_iovec(skb, sizeof(struct udphdr), |
22911fc5 | 389 | msg->msg_iov, copied); |
ba4e58ec | 390 | else { |
1da177e4 LT |
391 | err = skb_copy_and_csum_datagram_iovec(skb, sizeof(struct udphdr), msg->msg_iov); |
392 | if (err == -EINVAL) | |
393 | goto csum_copy_err; | |
394 | } | |
22911fc5 ED |
395 | if (unlikely(err)) { |
396 | trace_kfree_skb(skb, udpv6_recvmsg); | |
979402b1 ED |
397 | if (!peeked) { |
398 | atomic_inc(&sk->sk_drops); | |
399 | if (is_udp4) | |
400 | UDP_INC_STATS_USER(sock_net(sk), | |
401 | UDP_MIB_INERRORS, | |
402 | is_udplite); | |
403 | else | |
404 | UDP6_INC_STATS_USER(sock_net(sk), | |
405 | UDP_MIB_INERRORS, | |
406 | is_udplite); | |
407 | } | |
1da177e4 | 408 | goto out_free; |
22911fc5 | 409 | } |
f26ba175 WY |
410 | if (!peeked) { |
411 | if (is_udp4) | |
412 | UDP_INC_STATS_USER(sock_net(sk), | |
413 | UDP_MIB_INDATAGRAMS, is_udplite); | |
414 | else | |
415 | UDP6_INC_STATS_USER(sock_net(sk), | |
416 | UDP_MIB_INDATAGRAMS, is_udplite); | |
417 | } | |
cb75994e | 418 | |
3b885787 | 419 | sock_recv_ts_and_drops(msg, sk, skb); |
1da177e4 LT |
420 | |
421 | /* Copy the address. */ | |
422 | if (msg->msg_name) { | |
423 | struct sockaddr_in6 *sin6; | |
1ab1457c | 424 | |
1da177e4 LT |
425 | sin6 = (struct sockaddr_in6 *) msg->msg_name; |
426 | sin6->sin6_family = AF_INET6; | |
4bedb452 | 427 | sin6->sin6_port = udp_hdr(skb)->source; |
1da177e4 LT |
428 | sin6->sin6_flowinfo = 0; |
429 | sin6->sin6_scope_id = 0; | |
430 | ||
f26ba175 | 431 | if (is_udp4) |
b301e82c BH |
432 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
433 | &sin6->sin6_addr); | |
1da177e4 | 434 | else { |
4e3fd7a0 | 435 | sin6->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 LT |
436 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
437 | sin6->sin6_scope_id = IP6CB(skb)->iif; | |
438 | } | |
439 | ||
440 | } | |
f26ba175 | 441 | if (is_udp4) { |
1da177e4 LT |
442 | if (inet->cmsg_flags) |
443 | ip_cmsg_recv(msg, skb); | |
444 | } else { | |
445 | if (np->rxopt.all) | |
446 | datagram_recv_ctl(sk, msg, skb); | |
1ab1457c | 447 | } |
1da177e4 | 448 | |
59c2cdae | 449 | err = copied; |
1da177e4 | 450 | if (flags & MSG_TRUNC) |
759e5d00 | 451 | err = ulen; |
1da177e4 LT |
452 | |
453 | out_free: | |
9d410c79 | 454 | skb_free_datagram_locked(sk, skb); |
1da177e4 LT |
455 | out: |
456 | return err; | |
457 | ||
458 | csum_copy_err: | |
8a74ad60 | 459 | slow = lock_sock_fast(sk); |
0856f939 WY |
460 | if (!skb_kill_datagram(sk, skb, flags)) { |
461 | if (is_udp4) | |
462 | UDP_INC_STATS_USER(sock_net(sk), | |
463 | UDP_MIB_INERRORS, is_udplite); | |
464 | else | |
465 | UDP6_INC_STATS_USER(sock_net(sk), | |
466 | UDP_MIB_INERRORS, is_udplite); | |
467 | } | |
8a74ad60 | 468 | unlock_sock_fast(sk, slow); |
1da177e4 | 469 | |
32c90254 | 470 | if (noblock) |
1da177e4 | 471 | return -EAGAIN; |
9cfaa8de XZ |
472 | |
473 | /* starting over for a new packet */ | |
474 | msg->msg_flags &= ~MSG_TRUNC; | |
1da177e4 LT |
475 | goto try_again; |
476 | } | |
477 | ||
ba4e58ec | 478 | void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
d5fdd6ba | 479 | u8 type, u8 code, int offset, __be32 info, |
645ca708 | 480 | struct udp_table *udptable) |
1da177e4 LT |
481 | { |
482 | struct ipv6_pinfo *np; | |
b71d1d42 ED |
483 | const struct ipv6hdr *hdr = (const struct ipv6hdr *)skb->data; |
484 | const struct in6_addr *saddr = &hdr->saddr; | |
485 | const struct in6_addr *daddr = &hdr->daddr; | |
1da177e4 LT |
486 | struct udphdr *uh = (struct udphdr*)(skb->data+offset); |
487 | struct sock *sk; | |
488 | int err; | |
489 | ||
c346dca1 | 490 | sk = __udp6_lib_lookup(dev_net(skb->dev), daddr, uh->dest, |
ba4e58ec | 491 | saddr, uh->source, inet6_iif(skb), udptable); |
1da177e4 LT |
492 | if (sk == NULL) |
493 | return; | |
494 | ||
81aded24 DM |
495 | if (type == ICMPV6_PKT_TOOBIG) |
496 | ip6_sk_update_pmtu(skb, sk, info); | |
ec18d9a2 DM |
497 | if (type == NDISC_REDIRECT) |
498 | ip6_sk_redirect(skb, sk); | |
81aded24 | 499 | |
1da177e4 LT |
500 | np = inet6_sk(sk); |
501 | ||
502 | if (!icmpv6_err_convert(type, code, &err) && !np->recverr) | |
503 | goto out; | |
504 | ||
505 | if (sk->sk_state != TCP_ESTABLISHED && !np->recverr) | |
506 | goto out; | |
507 | ||
b1faf566 | 508 | if (np->recverr) |
1da177e4 | 509 | ipv6_icmp_error(sk, skb, err, uh->dest, ntohl(info), (u8 *)(uh+1)); |
b1faf566 | 510 | |
1da177e4 LT |
511 | sk->sk_err = err; |
512 | sk->sk_error_report(sk); | |
513 | out: | |
514 | sock_put(sk); | |
515 | } | |
516 | ||
f7ad74fe BL |
517 | static int __udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
518 | { | |
519 | int rc; | |
520 | ||
521 | if (!ipv6_addr_any(&inet6_sk(sk)->daddr)) | |
522 | sock_rps_save_rxhash(sk, skb); | |
523 | ||
524 | rc = sock_queue_rcv_skb(sk, skb); | |
525 | if (rc < 0) { | |
526 | int is_udplite = IS_UDPLITE(sk); | |
527 | ||
528 | /* Note that an ENOMEM error is charged twice */ | |
529 | if (rc == -ENOMEM) | |
530 | UDP6_INC_STATS_BH(sock_net(sk), | |
531 | UDP_MIB_RCVBUFERRORS, is_udplite); | |
532 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); | |
533 | kfree_skb(skb); | |
534 | return -1; | |
535 | } | |
536 | return 0; | |
537 | } | |
538 | ||
ba4e58ec | 539 | static __inline__ void udpv6_err(struct sk_buff *skb, |
d5fdd6ba BH |
540 | struct inet6_skb_parm *opt, u8 type, |
541 | u8 code, int offset, __be32 info ) | |
ba4e58ec | 542 | { |
645ca708 | 543 | __udp6_lib_err(skb, opt, type, code, offset, info, &udp_table); |
ba4e58ec GR |
544 | } |
545 | ||
d7f3f621 BL |
546 | static struct static_key udpv6_encap_needed __read_mostly; |
547 | void udpv6_encap_enable(void) | |
548 | { | |
549 | if (!static_key_enabled(&udpv6_encap_needed)) | |
550 | static_key_slow_inc(&udpv6_encap_needed); | |
551 | } | |
552 | EXPORT_SYMBOL(udpv6_encap_enable); | |
553 | ||
f7ad74fe | 554 | int udpv6_queue_rcv_skb(struct sock *sk, struct sk_buff *skb) |
1da177e4 | 555 | { |
ba4e58ec | 556 | struct udp_sock *up = udp_sk(sk); |
a18135eb | 557 | int rc; |
b2bf1e26 | 558 | int is_udplite = IS_UDPLITE(sk); |
a18135eb | 559 | |
ba4e58ec GR |
560 | if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) |
561 | goto drop; | |
1da177e4 | 562 | |
d7f3f621 BL |
563 | if (static_key_false(&udpv6_encap_needed) && up->encap_type) { |
564 | int (*encap_rcv)(struct sock *sk, struct sk_buff *skb); | |
565 | ||
566 | /* | |
567 | * This is an encapsulation socket so pass the skb to | |
568 | * the socket's udp_encap_rcv() hook. Otherwise, just | |
569 | * fall through and pass this up the UDP socket. | |
570 | * up->encap_rcv() returns the following value: | |
571 | * =0 if skb was successfully passed to the encap | |
572 | * handler or was discarded by it. | |
573 | * >0 if skb should be passed on to UDP. | |
574 | * <0 if skb should be resubmitted as proto -N | |
575 | */ | |
576 | ||
577 | /* if we're overly short, let UDP handle it */ | |
578 | encap_rcv = ACCESS_ONCE(up->encap_rcv); | |
579 | if (skb->len > sizeof(struct udphdr) && encap_rcv != NULL) { | |
580 | int ret; | |
581 | ||
582 | ret = encap_rcv(sk, skb); | |
583 | if (ret <= 0) { | |
584 | UDP_INC_STATS_BH(sock_net(sk), | |
585 | UDP_MIB_INDATAGRAMS, | |
586 | is_udplite); | |
587 | return -ret; | |
588 | } | |
589 | } | |
590 | ||
591 | /* FALLTHROUGH -- it's a UDP Packet */ | |
592 | } | |
593 | ||
ba4e58ec GR |
594 | /* |
595 | * UDP-Lite specific tests, ignored on UDP sockets (see net/ipv4/udp.c). | |
596 | */ | |
b2bf1e26 | 597 | if ((is_udplite & UDPLITE_RECV_CC) && UDP_SKB_CB(skb)->partial_cov) { |
ba4e58ec GR |
598 | |
599 | if (up->pcrlen == 0) { /* full coverage was set */ | |
600 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: partial coverage" | |
601 | " %d while full coverage %d requested\n", | |
602 | UDP_SKB_CB(skb)->cscov, skb->len); | |
603 | goto drop; | |
604 | } | |
605 | if (UDP_SKB_CB(skb)->cscov < up->pcrlen) { | |
606 | LIMIT_NETDEBUG(KERN_WARNING "UDPLITE6: coverage %d " | |
607 | "too small, need min %d\n", | |
608 | UDP_SKB_CB(skb)->cscov, up->pcrlen); | |
609 | goto drop; | |
610 | } | |
1da177e4 LT |
611 | } |
612 | ||
33d480ce | 613 | if (rcu_access_pointer(sk->sk_filter)) { |
1ab6eb62 HX |
614 | if (udp_lib_checksum_complete(skb)) |
615 | goto drop; | |
616 | } | |
ba4e58ec | 617 | |
cb80ef46 BL |
618 | if (sk_rcvqueues_full(sk, skb, sk->sk_rcvbuf)) |
619 | goto drop; | |
620 | ||
d826eb14 | 621 | skb_dst_drop(skb); |
cb75994e | 622 | |
cb80ef46 BL |
623 | bh_lock_sock(sk); |
624 | rc = 0; | |
625 | if (!sock_owned_by_user(sk)) | |
626 | rc = __udpv6_queue_rcv_skb(sk, skb); | |
627 | else if (sk_add_backlog(sk, skb, sk->sk_rcvbuf)) { | |
628 | bh_unlock_sock(sk); | |
629 | goto drop; | |
630 | } | |
631 | bh_unlock_sock(sk); | |
f7ad74fe BL |
632 | |
633 | return rc; | |
ba4e58ec | 634 | drop: |
ef28d1a2 | 635 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, is_udplite); |
cb80ef46 | 636 | atomic_inc(&sk->sk_drops); |
ba4e58ec GR |
637 | kfree_skb(skb); |
638 | return -1; | |
1da177e4 LT |
639 | } |
640 | ||
920a4611 | 641 | static struct sock *udp_v6_mcast_next(struct net *net, struct sock *sk, |
b71d1d42 ED |
642 | __be16 loc_port, const struct in6_addr *loc_addr, |
643 | __be16 rmt_port, const struct in6_addr *rmt_addr, | |
1da177e4 LT |
644 | int dif) |
645 | { | |
88ab1932 | 646 | struct hlist_nulls_node *node; |
1da177e4 LT |
647 | struct sock *s = sk; |
648 | unsigned short num = ntohs(loc_port); | |
649 | ||
88ab1932 | 650 | sk_nulls_for_each_from(s, node) { |
1da177e4 LT |
651 | struct inet_sock *inet = inet_sk(s); |
652 | ||
920a4611 | 653 | if (!net_eq(sock_net(s), net)) |
b8ad0cbc DL |
654 | continue; |
655 | ||
d4cada4a ED |
656 | if (udp_sk(s)->udp_port_hash == num && |
657 | s->sk_family == PF_INET6) { | |
1da177e4 | 658 | struct ipv6_pinfo *np = inet6_sk(s); |
c720c7e8 ED |
659 | if (inet->inet_dport) { |
660 | if (inet->inet_dport != rmt_port) | |
1da177e4 LT |
661 | continue; |
662 | } | |
663 | if (!ipv6_addr_any(&np->daddr) && | |
664 | !ipv6_addr_equal(&np->daddr, rmt_addr)) | |
665 | continue; | |
666 | ||
667 | if (s->sk_bound_dev_if && s->sk_bound_dev_if != dif) | |
668 | continue; | |
669 | ||
670 | if (!ipv6_addr_any(&np->rcv_saddr)) { | |
40796c5e DS |
671 | if (!ipv6_addr_equal(&np->rcv_saddr, loc_addr)) |
672 | continue; | |
1da177e4 | 673 | } |
add459aa | 674 | if (!inet6_mc_check(s, loc_addr, rmt_addr)) |
1da177e4 LT |
675 | continue; |
676 | return s; | |
677 | } | |
678 | } | |
679 | return NULL; | |
680 | } | |
681 | ||
a1ab77f9 ED |
682 | static void flush_stack(struct sock **stack, unsigned int count, |
683 | struct sk_buff *skb, unsigned int final) | |
684 | { | |
cb80ef46 | 685 | struct sk_buff *skb1 = NULL; |
a1ab77f9 | 686 | struct sock *sk; |
cb80ef46 | 687 | unsigned int i; |
a1ab77f9 ED |
688 | |
689 | for (i = 0; i < count; i++) { | |
f6b8f32c | 690 | sk = stack[i]; |
cb80ef46 BL |
691 | if (likely(skb1 == NULL)) |
692 | skb1 = (i == final) ? skb : skb_clone(skb, GFP_ATOMIC); | |
693 | if (!skb1) { | |
694 | atomic_inc(&sk->sk_drops); | |
695 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_RCVBUFERRORS, | |
696 | IS_UDPLITE(sk)); | |
697 | UDP6_INC_STATS_BH(sock_net(sk), UDP_MIB_INERRORS, | |
698 | IS_UDPLITE(sk)); | |
a1ab77f9 | 699 | } |
cb80ef46 BL |
700 | |
701 | if (skb1 && udpv6_queue_rcv_skb(sk, skb1) <= 0) | |
702 | skb1 = NULL; | |
a1ab77f9 | 703 | } |
cb80ef46 BL |
704 | if (unlikely(skb1)) |
705 | kfree_skb(skb1); | |
a1ab77f9 | 706 | } |
1da177e4 LT |
707 | /* |
708 | * Note: called only from the BH handler context, | |
709 | * so we don't need to lock the hashes. | |
710 | */ | |
e3163493 | 711 | static int __udp6_lib_mcast_deliver(struct net *net, struct sk_buff *skb, |
b71d1d42 | 712 | const struct in6_addr *saddr, const struct in6_addr *daddr, |
645ca708 | 713 | struct udp_table *udptable) |
1da177e4 | 714 | { |
a1ab77f9 | 715 | struct sock *sk, *stack[256 / sizeof(struct sock *)]; |
4bedb452 | 716 | const struct udphdr *uh = udp_hdr(skb); |
f86dcc5a | 717 | struct udp_hslot *hslot = udp_hashslot(udptable, net, ntohs(uh->dest)); |
1da177e4 | 718 | int dif; |
a1ab77f9 | 719 | unsigned int i, count = 0; |
1da177e4 | 720 | |
645ca708 | 721 | spin_lock(&hslot->lock); |
88ab1932 | 722 | sk = sk_nulls_head(&hslot->head); |
f2776ff0 | 723 | dif = inet6_iif(skb); |
920a4611 | 724 | sk = udp_v6_mcast_next(net, sk, uh->dest, daddr, uh->source, saddr, dif); |
a1ab77f9 ED |
725 | while (sk) { |
726 | stack[count++] = sk; | |
727 | sk = udp_v6_mcast_next(net, sk_nulls_next(sk), uh->dest, daddr, | |
728 | uh->source, saddr, dif); | |
729 | if (unlikely(count == ARRAY_SIZE(stack))) { | |
730 | if (!sk) | |
731 | break; | |
732 | flush_stack(stack, count, skb, ~0); | |
733 | count = 0; | |
95766fff | 734 | } |
1da177e4 | 735 | } |
a1ab77f9 ED |
736 | /* |
737 | * before releasing the lock, we must take reference on sockets | |
738 | */ | |
739 | for (i = 0; i < count; i++) | |
740 | sock_hold(stack[i]); | |
741 | ||
645ca708 | 742 | spin_unlock(&hslot->lock); |
a1ab77f9 ED |
743 | |
744 | if (count) { | |
745 | flush_stack(stack, count, skb, count - 1); | |
746 | ||
747 | for (i = 0; i < count; i++) | |
748 | sock_put(stack[i]); | |
749 | } else { | |
750 | kfree_skb(skb); | |
751 | } | |
ba4e58ec | 752 | return 0; |
1da177e4 LT |
753 | } |
754 | ||
759e5d00 HX |
755 | static inline int udp6_csum_init(struct sk_buff *skb, struct udphdr *uh, |
756 | int proto) | |
ba4e58ec | 757 | { |
759e5d00 HX |
758 | int err; |
759 | ||
760 | UDP_SKB_CB(skb)->partial_cov = 0; | |
761 | UDP_SKB_CB(skb)->cscov = skb->len; | |
762 | ||
db8dac20 | 763 | if (proto == IPPROTO_UDPLITE) { |
759e5d00 HX |
764 | err = udplite_checksum_init(skb, uh); |
765 | if (err) | |
766 | return err; | |
767 | } | |
768 | ||
ba4e58ec GR |
769 | if (uh->check == 0) { |
770 | /* RFC 2460 section 8.1 says that we SHOULD log | |
771 | this error. Well, it is reasonable. | |
772 | */ | |
773 | LIMIT_NETDEBUG(KERN_INFO "IPv6: udp checksum is 0\n"); | |
774 | return 1; | |
775 | } | |
776 | if (skb->ip_summed == CHECKSUM_COMPLETE && | |
0660e03f | 777 | !csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr, |
759e5d00 | 778 | skb->len, proto, skb->csum)) |
ba4e58ec GR |
779 | skb->ip_summed = CHECKSUM_UNNECESSARY; |
780 | ||
60476372 | 781 | if (!skb_csum_unnecessary(skb)) |
0660e03f ACM |
782 | skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, |
783 | &ipv6_hdr(skb)->daddr, | |
759e5d00 | 784 | skb->len, proto, 0)); |
ba4e58ec | 785 | |
759e5d00 | 786 | return 0; |
ba4e58ec GR |
787 | } |
788 | ||
645ca708 | 789 | int __udp6_lib_rcv(struct sk_buff *skb, struct udp_table *udptable, |
759e5d00 | 790 | int proto) |
1da177e4 | 791 | { |
3ffe533c | 792 | struct net *net = dev_net(skb->dev); |
1da177e4 | 793 | struct sock *sk; |
1ab1457c | 794 | struct udphdr *uh; |
b71d1d42 | 795 | const struct in6_addr *saddr, *daddr; |
1da177e4 LT |
796 | u32 ulen = 0; |
797 | ||
798 | if (!pskb_may_pull(skb, sizeof(struct udphdr))) | |
d6bc0149 | 799 | goto discard; |
1da177e4 | 800 | |
0660e03f ACM |
801 | saddr = &ipv6_hdr(skb)->saddr; |
802 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 803 | uh = udp_hdr(skb); |
1da177e4 LT |
804 | |
805 | ulen = ntohs(uh->len); | |
ba4e58ec GR |
806 | if (ulen > skb->len) |
807 | goto short_packet; | |
1da177e4 | 808 | |
759e5d00 HX |
809 | if (proto == IPPROTO_UDP) { |
810 | /* UDP validates ulen. */ | |
1da177e4 | 811 | |
ba4e58ec GR |
812 | /* Check for jumbo payload */ |
813 | if (ulen == 0) | |
814 | ulen = skb->len; | |
1da177e4 | 815 | |
ba4e58ec GR |
816 | if (ulen < sizeof(*uh)) |
817 | goto short_packet; | |
1da177e4 | 818 | |
ba4e58ec GR |
819 | if (ulen < skb->len) { |
820 | if (pskb_trim_rcsum(skb, ulen)) | |
821 | goto short_packet; | |
0660e03f ACM |
822 | saddr = &ipv6_hdr(skb)->saddr; |
823 | daddr = &ipv6_hdr(skb)->daddr; | |
4bedb452 | 824 | uh = udp_hdr(skb); |
ba4e58ec | 825 | } |
ba4e58ec | 826 | } |
1da177e4 | 827 | |
759e5d00 HX |
828 | if (udp6_csum_init(skb, uh, proto)) |
829 | goto discard; | |
830 | ||
1ab1457c YH |
831 | /* |
832 | * Multicast receive code | |
1da177e4 | 833 | */ |
ba4e58ec | 834 | if (ipv6_addr_is_multicast(daddr)) |
e3163493 PE |
835 | return __udp6_lib_mcast_deliver(net, skb, |
836 | saddr, daddr, udptable); | |
1da177e4 LT |
837 | |
838 | /* Unicast */ | |
839 | ||
1ab1457c | 840 | /* |
1da177e4 LT |
841 | * check socket cache ... must talk to Alan about his plans |
842 | * for sock caches... i'll skip this for now. | |
843 | */ | |
607c4aaf | 844 | sk = __udp6_lib_lookup_skb(skb, uh->source, uh->dest, udptable); |
cb80ef46 BL |
845 | if (sk != NULL) { |
846 | int ret = udpv6_queue_rcv_skb(sk, skb); | |
847 | sock_put(sk); | |
1da177e4 | 848 | |
cb80ef46 BL |
849 | /* a return value > 0 means to resubmit the input, but |
850 | * it wants the return to be -protocol, or 0 | |
851 | */ | |
852 | if (ret > 0) | |
853 | return -ret; | |
1da177e4 | 854 | |
add459aa | 855 | return 0; |
1da177e4 | 856 | } |
1ab1457c | 857 | |
cb80ef46 | 858 | if (!xfrm6_policy_check(NULL, XFRM_POLICY_IN, skb)) |
c377411f | 859 | goto discard; |
cb80ef46 BL |
860 | |
861 | if (udp_lib_checksum_complete(skb)) | |
55349790 | 862 | goto discard; |
cb80ef46 BL |
863 | |
864 | UDP6_INC_STATS_BH(net, UDP_MIB_NOPORTS, proto == IPPROTO_UDPLITE); | |
865 | icmpv6_send(skb, ICMPV6_DEST_UNREACH, ICMPV6_PORT_UNREACH, 0); | |
866 | ||
867 | kfree_skb(skb); | |
add459aa | 868 | return 0; |
1da177e4 | 869 | |
1ab1457c | 870 | short_packet: |
d6bc0149 | 871 | LIMIT_NETDEBUG(KERN_DEBUG "UDP%sv6: short packet: From [%pI6c]:%u %d/%d to [%pI6c]:%u\n", |
db8dac20 | 872 | proto == IPPROTO_UDPLITE ? "-Lite" : "", |
d6bc0149 BM |
873 | saddr, |
874 | ntohs(uh->source), | |
875 | ulen, | |
876 | skb->len, | |
877 | daddr, | |
878 | ntohs(uh->dest)); | |
1da177e4 LT |
879 | |
880 | discard: | |
ef28d1a2 | 881 | UDP6_INC_STATS_BH(net, UDP_MIB_INERRORS, proto == IPPROTO_UDPLITE); |
1da177e4 | 882 | kfree_skb(skb); |
add459aa | 883 | return 0; |
1da177e4 | 884 | } |
ba4e58ec | 885 | |
e5bbef20 | 886 | static __inline__ int udpv6_rcv(struct sk_buff *skb) |
ba4e58ec | 887 | { |
645ca708 | 888 | return __udp6_lib_rcv(skb, &udp_table, IPPROTO_UDP); |
ba4e58ec GR |
889 | } |
890 | ||
1da177e4 LT |
891 | /* |
892 | * Throw away all pending data and cancel the corking. Socket is locked. | |
893 | */ | |
894 | static void udp_v6_flush_pending_frames(struct sock *sk) | |
895 | { | |
896 | struct udp_sock *up = udp_sk(sk); | |
897 | ||
36d926b9 DL |
898 | if (up->pending == AF_INET) |
899 | udp_flush_pending_frames(sk); | |
900 | else if (up->pending) { | |
1da177e4 LT |
901 | up->len = 0; |
902 | up->pending = 0; | |
903 | ip6_flush_pending_frames(sk); | |
1ab1457c | 904 | } |
1da177e4 LT |
905 | } |
906 | ||
493c6be3 SS |
907 | /** |
908 | * udp6_hwcsum_outgoing - handle outgoing HW checksumming | |
909 | * @sk: socket we are sending on | |
910 | * @skb: sk_buff containing the filled-in UDP header | |
911 | * (checksum field must be zeroed out) | |
912 | */ | |
913 | static void udp6_hwcsum_outgoing(struct sock *sk, struct sk_buff *skb, | |
914 | const struct in6_addr *saddr, | |
915 | const struct in6_addr *daddr, int len) | |
916 | { | |
917 | unsigned int offset; | |
918 | struct udphdr *uh = udp_hdr(skb); | |
919 | __wsum csum = 0; | |
920 | ||
921 | if (skb_queue_len(&sk->sk_write_queue) == 1) { | |
922 | /* Only one fragment on the socket. */ | |
923 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
924 | skb->csum_offset = offsetof(struct udphdr, check); | |
925 | uh->check = ~csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, 0); | |
926 | } else { | |
927 | /* | |
928 | * HW-checksum won't work as there are two or more | |
929 | * fragments on the socket so that all csums of sk_buffs | |
930 | * should be together | |
931 | */ | |
932 | offset = skb_transport_offset(skb); | |
933 | skb->csum = skb_checksum(skb, offset, skb->len - offset, 0); | |
934 | ||
935 | skb->ip_summed = CHECKSUM_NONE; | |
936 | ||
937 | skb_queue_walk(&sk->sk_write_queue, skb) { | |
938 | csum = csum_add(csum, skb->csum); | |
939 | } | |
940 | ||
941 | uh->check = csum_ipv6_magic(saddr, daddr, len, IPPROTO_UDP, | |
942 | csum); | |
943 | if (uh->check == 0) | |
944 | uh->check = CSUM_MANGLED_0; | |
945 | } | |
946 | } | |
947 | ||
1da177e4 LT |
948 | /* |
949 | * Sending | |
950 | */ | |
951 | ||
4c0a6cb0 | 952 | static int udp_v6_push_pending_frames(struct sock *sk) |
1da177e4 LT |
953 | { |
954 | struct sk_buff *skb; | |
955 | struct udphdr *uh; | |
4c0a6cb0 | 956 | struct udp_sock *up = udp_sk(sk); |
1da177e4 | 957 | struct inet_sock *inet = inet_sk(sk); |
4c9483b2 | 958 | struct flowi6 *fl6 = &inet->cork.fl.u.ip6; |
1da177e4 | 959 | int err = 0; |
b2bf1e26 | 960 | int is_udplite = IS_UDPLITE(sk); |
868c86bc | 961 | __wsum csum = 0; |
1da177e4 LT |
962 | |
963 | /* Grab the skbuff where UDP header space exists. */ | |
964 | if ((skb = skb_peek(&sk->sk_write_queue)) == NULL) | |
965 | goto out; | |
966 | ||
967 | /* | |
968 | * Create a UDP header | |
969 | */ | |
4bedb452 | 970 | uh = udp_hdr(skb); |
1958b856 DM |
971 | uh->source = fl6->fl6_sport; |
972 | uh->dest = fl6->fl6_dport; | |
1da177e4 LT |
973 | uh->len = htons(up->len); |
974 | uh->check = 0; | |
975 | ||
b2bf1e26 | 976 | if (is_udplite) |
ba4e58ec | 977 | csum = udplite_csum_outgoing(sk, skb); |
493c6be3 | 978 | else if (skb->ip_summed == CHECKSUM_PARTIAL) { /* UDP hardware csum */ |
4c9483b2 | 979 | udp6_hwcsum_outgoing(sk, skb, &fl6->saddr, &fl6->daddr, |
493c6be3 SS |
980 | up->len); |
981 | goto send; | |
982 | } else | |
ba4e58ec | 983 | csum = udp_csum_outgoing(sk, skb); |
1da177e4 | 984 | |
ba4e58ec | 985 | /* add protocol-dependent pseudo-header */ |
4c9483b2 DM |
986 | uh->check = csum_ipv6_magic(&fl6->saddr, &fl6->daddr, |
987 | up->len, fl6->flowi6_proto, csum); | |
1da177e4 | 988 | if (uh->check == 0) |
f6ab0288 | 989 | uh->check = CSUM_MANGLED_0; |
1da177e4 | 990 | |
493c6be3 | 991 | send: |
1da177e4 | 992 | err = ip6_push_pending_frames(sk); |
6ce9e7b5 ED |
993 | if (err) { |
994 | if (err == -ENOBUFS && !inet6_sk(sk)->recverr) { | |
995 | UDP6_INC_STATS_USER(sock_net(sk), | |
996 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
997 | err = 0; | |
998 | } | |
999 | } else | |
1000 | UDP6_INC_STATS_USER(sock_net(sk), | |
1001 | UDP_MIB_OUTDATAGRAMS, is_udplite); | |
1da177e4 LT |
1002 | out: |
1003 | up->len = 0; | |
1004 | up->pending = 0; | |
1005 | return err; | |
1006 | } | |
1007 | ||
ba4e58ec | 1008 | int udpv6_sendmsg(struct kiocb *iocb, struct sock *sk, |
1da177e4 LT |
1009 | struct msghdr *msg, size_t len) |
1010 | { | |
1011 | struct ipv6_txoptions opt_space; | |
1012 | struct udp_sock *up = udp_sk(sk); | |
1013 | struct inet_sock *inet = inet_sk(sk); | |
1014 | struct ipv6_pinfo *np = inet6_sk(sk); | |
1015 | struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) msg->msg_name; | |
20c59de2 | 1016 | struct in6_addr *daddr, *final_p, final; |
1da177e4 LT |
1017 | struct ipv6_txoptions *opt = NULL; |
1018 | struct ip6_flowlabel *flowlabel = NULL; | |
4c9483b2 | 1019 | struct flowi6 fl6; |
1da177e4 LT |
1020 | struct dst_entry *dst; |
1021 | int addr_len = msg->msg_namelen; | |
1022 | int ulen = len; | |
1023 | int hlimit = -1; | |
41a1f8ea | 1024 | int tclass = -1; |
13b52cd4 | 1025 | int dontfrag = -1; |
1da177e4 LT |
1026 | int corkreq = up->corkflag || msg->msg_flags&MSG_MORE; |
1027 | int err; | |
987905de | 1028 | int connected = 0; |
b2bf1e26 | 1029 | int is_udplite = IS_UDPLITE(sk); |
ba4e58ec | 1030 | int (*getfrag)(void *, char *, int, int, int, struct sk_buff *); |
1da177e4 LT |
1031 | |
1032 | /* destination address check */ | |
1033 | if (sin6) { | |
1034 | if (addr_len < offsetof(struct sockaddr, sa_data)) | |
1035 | return -EINVAL; | |
1036 | ||
1037 | switch (sin6->sin6_family) { | |
1038 | case AF_INET6: | |
1039 | if (addr_len < SIN6_LEN_RFC2133) | |
1040 | return -EINVAL; | |
1041 | daddr = &sin6->sin6_addr; | |
1042 | break; | |
1043 | case AF_INET: | |
1044 | goto do_udp_sendmsg; | |
1045 | case AF_UNSPEC: | |
1046 | msg->msg_name = sin6 = NULL; | |
1047 | msg->msg_namelen = addr_len = 0; | |
1048 | daddr = NULL; | |
1049 | break; | |
1050 | default: | |
1051 | return -EINVAL; | |
1052 | } | |
1053 | } else if (!up->pending) { | |
1054 | if (sk->sk_state != TCP_ESTABLISHED) | |
1055 | return -EDESTADDRREQ; | |
1056 | daddr = &np->daddr; | |
1ab1457c | 1057 | } else |
1da177e4 LT |
1058 | daddr = NULL; |
1059 | ||
1060 | if (daddr) { | |
e773e4fa | 1061 | if (ipv6_addr_v4mapped(daddr)) { |
1da177e4 LT |
1062 | struct sockaddr_in sin; |
1063 | sin.sin_family = AF_INET; | |
c720c7e8 | 1064 | sin.sin_port = sin6 ? sin6->sin6_port : inet->inet_dport; |
1da177e4 LT |
1065 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; |
1066 | msg->msg_name = &sin; | |
1067 | msg->msg_namelen = sizeof(sin); | |
1068 | do_udp_sendmsg: | |
1069 | if (__ipv6_only_sock(sk)) | |
1070 | return -ENETUNREACH; | |
1071 | return udp_sendmsg(iocb, sk, msg, len); | |
1072 | } | |
1073 | } | |
1074 | ||
1075 | if (up->pending == AF_INET) | |
1076 | return udp_sendmsg(iocb, sk, msg, len); | |
1077 | ||
1078 | /* Rough check on arithmetic overflow, | |
b59e139b | 1079 | better check is made in ip6_append_data(). |
1da177e4 LT |
1080 | */ |
1081 | if (len > INT_MAX - sizeof(struct udphdr)) | |
1082 | return -EMSGSIZE; | |
1ab1457c | 1083 | |
1da177e4 LT |
1084 | if (up->pending) { |
1085 | /* | |
1086 | * There are pending frames. | |
1087 | * The socket lock must be held while it's corked. | |
1088 | */ | |
1089 | lock_sock(sk); | |
1090 | if (likely(up->pending)) { | |
1091 | if (unlikely(up->pending != AF_INET6)) { | |
1092 | release_sock(sk); | |
1093 | return -EAFNOSUPPORT; | |
1094 | } | |
1095 | dst = NULL; | |
1096 | goto do_append_data; | |
1097 | } | |
1098 | release_sock(sk); | |
1099 | } | |
1100 | ulen += sizeof(struct udphdr); | |
1101 | ||
4c9483b2 | 1102 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 LT |
1103 | |
1104 | if (sin6) { | |
1105 | if (sin6->sin6_port == 0) | |
1106 | return -EINVAL; | |
1107 | ||
1958b856 | 1108 | fl6.fl6_dport = sin6->sin6_port; |
1da177e4 LT |
1109 | daddr = &sin6->sin6_addr; |
1110 | ||
1111 | if (np->sndflow) { | |
4c9483b2 DM |
1112 | fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
1113 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
1114 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1115 | if (flowlabel == NULL) |
1116 | return -EINVAL; | |
1117 | daddr = &flowlabel->dst; | |
1118 | } | |
1119 | } | |
1120 | ||
1121 | /* | |
1122 | * Otherwise it will be difficult to maintain | |
1123 | * sk->sk_dst_cache. | |
1124 | */ | |
1125 | if (sk->sk_state == TCP_ESTABLISHED && | |
1126 | ipv6_addr_equal(daddr, &np->daddr)) | |
1127 | daddr = &np->daddr; | |
1128 | ||
1129 | if (addr_len >= sizeof(struct sockaddr_in6) && | |
1130 | sin6->sin6_scope_id && | |
1131 | ipv6_addr_type(daddr)&IPV6_ADDR_LINKLOCAL) | |
4c9483b2 | 1132 | fl6.flowi6_oif = sin6->sin6_scope_id; |
1da177e4 LT |
1133 | } else { |
1134 | if (sk->sk_state != TCP_ESTABLISHED) | |
1135 | return -EDESTADDRREQ; | |
1136 | ||
1958b856 | 1137 | fl6.fl6_dport = inet->inet_dport; |
1da177e4 | 1138 | daddr = &np->daddr; |
4c9483b2 | 1139 | fl6.flowlabel = np->flow_label; |
987905de | 1140 | connected = 1; |
1da177e4 LT |
1141 | } |
1142 | ||
4c9483b2 DM |
1143 | if (!fl6.flowi6_oif) |
1144 | fl6.flowi6_oif = sk->sk_bound_dev_if; | |
1da177e4 | 1145 | |
4c9483b2 DM |
1146 | if (!fl6.flowi6_oif) |
1147 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
9f690db7 | 1148 | |
4c9483b2 | 1149 | fl6.flowi6_mark = sk->sk_mark; |
51953d5b | 1150 | |
1da177e4 LT |
1151 | if (msg->msg_controllen) { |
1152 | opt = &opt_space; | |
1153 | memset(opt, 0, sizeof(struct ipv6_txoptions)); | |
1154 | opt->tot_len = sizeof(*opt); | |
1155 | ||
ec0506db MÅ» |
1156 | err = datagram_send_ctl(sock_net(sk), sk, msg, &fl6, opt, |
1157 | &hlimit, &tclass, &dontfrag); | |
1da177e4 LT |
1158 | if (err < 0) { |
1159 | fl6_sock_release(flowlabel); | |
1160 | return err; | |
1161 | } | |
4c9483b2 DM |
1162 | if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) { |
1163 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
1da177e4 LT |
1164 | if (flowlabel == NULL) |
1165 | return -EINVAL; | |
1166 | } | |
1167 | if (!(opt->opt_nflen|opt->opt_flen)) | |
1168 | opt = NULL; | |
987905de | 1169 | connected = 0; |
1da177e4 LT |
1170 | } |
1171 | if (opt == NULL) | |
1172 | opt = np->opt; | |
df9890c3 YH |
1173 | if (flowlabel) |
1174 | opt = fl6_merge_options(&opt_space, flowlabel, opt); | |
1175 | opt = ipv6_fixup_options(&opt_space, opt); | |
1da177e4 | 1176 | |
4c9483b2 | 1177 | fl6.flowi6_proto = sk->sk_protocol; |
876c7f41 | 1178 | if (!ipv6_addr_any(daddr)) |
4e3fd7a0 | 1179 | fl6.daddr = *daddr; |
876c7f41 | 1180 | else |
4c9483b2 DM |
1181 | fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */ |
1182 | if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 1183 | fl6.saddr = np->saddr; |
1958b856 | 1184 | fl6.fl6_sport = inet->inet_sport; |
1ab1457c | 1185 | |
4c9483b2 | 1186 | final_p = fl6_update_dst(&fl6, opt, &final); |
20c59de2 | 1187 | if (final_p) |
987905de | 1188 | connected = 0; |
1da177e4 | 1189 | |
4c9483b2 DM |
1190 | if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr)) { |
1191 | fl6.flowi6_oif = np->mcast_oif; | |
987905de | 1192 | connected = 0; |
c4062dfc EH |
1193 | } else if (!fl6.flowi6_oif) |
1194 | fl6.flowi6_oif = np->ucast_oif; | |
1da177e4 | 1195 | |
4c9483b2 | 1196 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 1197 | |
4c9483b2 | 1198 | dst = ip6_sk_dst_lookup_flow(sk, &fl6, final_p, true); |
68d0c6d3 DM |
1199 | if (IS_ERR(dst)) { |
1200 | err = PTR_ERR(dst); | |
1201 | dst = NULL; | |
1da177e4 | 1202 | goto out; |
14e50e57 | 1203 | } |
1da177e4 LT |
1204 | |
1205 | if (hlimit < 0) { | |
4c9483b2 | 1206 | if (ipv6_addr_is_multicast(&fl6.daddr)) |
1da177e4 LT |
1207 | hlimit = np->mcast_hops; |
1208 | else | |
1209 | hlimit = np->hop_limit; | |
1210 | if (hlimit < 0) | |
6b75d090 | 1211 | hlimit = ip6_dst_hoplimit(dst); |
1da177e4 LT |
1212 | } |
1213 | ||
e651f03a | 1214 | if (tclass < 0) |
41a1f8ea | 1215 | tclass = np->tclass; |
41a1f8ea | 1216 | |
13b52cd4 BH |
1217 | if (dontfrag < 0) |
1218 | dontfrag = np->dontfrag; | |
1219 | ||
1da177e4 LT |
1220 | if (msg->msg_flags&MSG_CONFIRM) |
1221 | goto do_confirm; | |
1222 | back_from_confirm: | |
1223 | ||
1224 | lock_sock(sk); | |
1225 | if (unlikely(up->pending)) { | |
1226 | /* The socket is already corked while preparing it. */ | |
1227 | /* ... which is an evident application bug. --ANK */ | |
1228 | release_sock(sk); | |
1229 | ||
64ce2073 | 1230 | LIMIT_NETDEBUG(KERN_DEBUG "udp cork app bug 2\n"); |
1da177e4 LT |
1231 | err = -EINVAL; |
1232 | goto out; | |
1233 | } | |
1234 | ||
1235 | up->pending = AF_INET6; | |
1236 | ||
1237 | do_append_data: | |
1238 | up->len += ulen; | |
ba4e58ec GR |
1239 | getfrag = is_udplite ? udplite_getfrag : ip_generic_getfrag; |
1240 | err = ip6_append_data(sk, getfrag, msg->msg_iov, ulen, | |
4c9483b2 | 1241 | sizeof(struct udphdr), hlimit, tclass, opt, &fl6, |
41a1f8ea | 1242 | (struct rt6_info*)dst, |
13b52cd4 | 1243 | corkreq ? msg->msg_flags|MSG_MORE : msg->msg_flags, dontfrag); |
1da177e4 LT |
1244 | if (err) |
1245 | udp_v6_flush_pending_frames(sk); | |
1246 | else if (!corkreq) | |
4c0a6cb0 | 1247 | err = udp_v6_push_pending_frames(sk); |
1e0c14f4 HX |
1248 | else if (unlikely(skb_queue_empty(&sk->sk_write_queue))) |
1249 | up->pending = 0; | |
1da177e4 | 1250 | |
a5e7c210 DM |
1251 | if (dst) { |
1252 | if (connected) { | |
1253 | ip6_dst_store(sk, dst, | |
4c9483b2 | 1254 | ipv6_addr_equal(&fl6.daddr, &np->daddr) ? |
8e1ef0a9 YH |
1255 | &np->daddr : NULL, |
1256 | #ifdef CONFIG_IPV6_SUBTREES | |
4c9483b2 | 1257 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
1258 | &np->saddr : |
1259 | #endif | |
1260 | NULL); | |
a5e7c210 DM |
1261 | } else { |
1262 | dst_release(dst); | |
1263 | } | |
a3c96089 | 1264 | dst = NULL; |
a5e7c210 DM |
1265 | } |
1266 | ||
1da177e4 LT |
1267 | if (err > 0) |
1268 | err = np->recverr ? net_xmit_errno(err) : 0; | |
1269 | release_sock(sk); | |
1270 | out: | |
a3c96089 | 1271 | dst_release(dst); |
1da177e4 | 1272 | fl6_sock_release(flowlabel); |
cd562c98 | 1273 | if (!err) |
1da177e4 | 1274 | return len; |
a18135eb DM |
1275 | /* |
1276 | * ENOBUFS = no kernel mem, SOCK_NOSPACE = no sndbuf space. Reporting | |
1277 | * ENOBUFS might not be good (it's not tunable per se), but otherwise | |
1278 | * we don't have a good statistic (IpOutDiscards but it can be too many | |
1279 | * things). We could add another new stat but at least for now that | |
1280 | * seems like overkill. | |
1281 | */ | |
1282 | if (err == -ENOBUFS || test_bit(SOCK_NOSPACE, &sk->sk_socket->flags)) { | |
235b9f7a PE |
1283 | UDP6_INC_STATS_USER(sock_net(sk), |
1284 | UDP_MIB_SNDBUFERRORS, is_udplite); | |
a18135eb | 1285 | } |
1da177e4 LT |
1286 | return err; |
1287 | ||
1288 | do_confirm: | |
1289 | dst_confirm(dst); | |
1290 | if (!(msg->msg_flags&MSG_PROBE) || len) | |
1291 | goto back_from_confirm; | |
1292 | err = 0; | |
1293 | goto out; | |
1294 | } | |
1295 | ||
7d06b2e0 | 1296 | void udpv6_destroy_sock(struct sock *sk) |
1da177e4 LT |
1297 | { |
1298 | lock_sock(sk); | |
1299 | udp_v6_flush_pending_frames(sk); | |
1300 | release_sock(sk); | |
1301 | ||
1302 | inet6_destroy_sock(sk); | |
1da177e4 LT |
1303 | } |
1304 | ||
1305 | /* | |
1306 | * Socket option code for UDP | |
1307 | */ | |
ba4e58ec | 1308 | int udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1309 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1310 | { |
db8dac20 | 1311 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1312 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1313 | udp_v6_push_pending_frames); | |
ba4e58ec | 1314 | return ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1315 | } |
1316 | ||
1317 | #ifdef CONFIG_COMPAT | |
ba4e58ec | 1318 | int compat_udpv6_setsockopt(struct sock *sk, int level, int optname, |
b7058842 | 1319 | char __user *optval, unsigned int optlen) |
3fdadf7d | 1320 | { |
db8dac20 | 1321 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 GR |
1322 | return udp_lib_setsockopt(sk, level, optname, optval, optlen, |
1323 | udp_v6_push_pending_frames); | |
ba4e58ec | 1324 | return compat_ipv6_setsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1325 | } |
1326 | #endif | |
1327 | ||
ba4e58ec GR |
1328 | int udpv6_getsockopt(struct sock *sk, int level, int optname, |
1329 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1330 | { |
db8dac20 | 1331 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1332 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1333 | return ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1334 | } |
1335 | ||
1336 | #ifdef CONFIG_COMPAT | |
ba4e58ec GR |
1337 | int compat_udpv6_getsockopt(struct sock *sk, int level, int optname, |
1338 | char __user *optval, int __user *optlen) | |
3fdadf7d | 1339 | { |
db8dac20 | 1340 | if (level == SOL_UDP || level == SOL_UDPLITE) |
4c0a6cb0 | 1341 | return udp_lib_getsockopt(sk, level, optname, optval, optlen); |
ba4e58ec | 1342 | return compat_ipv6_getsockopt(sk, level, optname, optval, optlen); |
3fdadf7d DM |
1343 | } |
1344 | #endif | |
1345 | ||
ba735425 SS |
1346 | static int udp6_ufo_send_check(struct sk_buff *skb) |
1347 | { | |
b71d1d42 | 1348 | const struct ipv6hdr *ipv6h; |
ba735425 SS |
1349 | struct udphdr *uh; |
1350 | ||
1351 | if (!pskb_may_pull(skb, sizeof(*uh))) | |
1352 | return -EINVAL; | |
1353 | ||
1354 | ipv6h = ipv6_hdr(skb); | |
1355 | uh = udp_hdr(skb); | |
1356 | ||
1357 | uh->check = ~csum_ipv6_magic(&ipv6h->saddr, &ipv6h->daddr, skb->len, | |
1358 | IPPROTO_UDP, 0); | |
1359 | skb->csum_start = skb_transport_header(skb) - skb->head; | |
1360 | skb->csum_offset = offsetof(struct udphdr, check); | |
1361 | skb->ip_summed = CHECKSUM_PARTIAL; | |
1362 | return 0; | |
1363 | } | |
1364 | ||
c8f44aff MM |
1365 | static struct sk_buff *udp6_ufo_fragment(struct sk_buff *skb, |
1366 | netdev_features_t features) | |
ba735425 SS |
1367 | { |
1368 | struct sk_buff *segs = ERR_PTR(-EINVAL); | |
1369 | unsigned int mss; | |
1370 | unsigned int unfrag_ip6hlen, unfrag_len; | |
1371 | struct frag_hdr *fptr; | |
1372 | u8 *mac_start, *prevhdr; | |
1373 | u8 nexthdr; | |
1374 | u8 frag_hdr_sz = sizeof(struct frag_hdr); | |
1375 | int offset; | |
1376 | __wsum csum; | |
1377 | ||
1378 | mss = skb_shinfo(skb)->gso_size; | |
1379 | if (unlikely(skb->len <= mss)) | |
1380 | goto out; | |
1381 | ||
1382 | if (skb_gso_ok(skb, features | NETIF_F_GSO_ROBUST)) { | |
1383 | /* Packet is from an untrusted source, reset gso_segs. */ | |
1384 | int type = skb_shinfo(skb)->gso_type; | |
1385 | ||
1386 | if (unlikely(type & ~(SKB_GSO_UDP | SKB_GSO_DODGY) || | |
1387 | !(type & (SKB_GSO_UDP)))) | |
1388 | goto out; | |
1389 | ||
1390 | skb_shinfo(skb)->gso_segs = DIV_ROUND_UP(skb->len, mss); | |
1391 | ||
1392 | segs = NULL; | |
1393 | goto out; | |
1394 | } | |
1395 | ||
1396 | /* Do software UFO. Complete and fill in the UDP checksum as HW cannot | |
1397 | * do checksum of UDP packets sent as multiple IP fragments. | |
1398 | */ | |
96339d6c | 1399 | offset = skb_checksum_start_offset(skb); |
3dde2598 | 1400 | csum = skb_checksum(skb, offset, skb->len - offset, 0); |
ba735425 SS |
1401 | offset += skb->csum_offset; |
1402 | *(__sum16 *)(skb->data + offset) = csum_fold(csum); | |
1403 | skb->ip_summed = CHECKSUM_NONE; | |
1404 | ||
1405 | /* Check if there is enough headroom to insert fragment header. */ | |
a9cf73ea | 1406 | if ((skb_mac_header(skb) < skb->head + frag_hdr_sz) && |
ba735425 SS |
1407 | pskb_expand_head(skb, frag_hdr_sz, 0, GFP_ATOMIC)) |
1408 | goto out; | |
1409 | ||
1410 | /* Find the unfragmentable header and shift it left by frag_hdr_sz | |
1411 | * bytes to insert fragment header. | |
1412 | */ | |
1413 | unfrag_ip6hlen = ip6_find_1stfragopt(skb, &prevhdr); | |
1414 | nexthdr = *prevhdr; | |
1415 | *prevhdr = NEXTHDR_FRAGMENT; | |
1416 | unfrag_len = skb_network_header(skb) - skb_mac_header(skb) + | |
1417 | unfrag_ip6hlen; | |
1418 | mac_start = skb_mac_header(skb); | |
1419 | memmove(mac_start-frag_hdr_sz, mac_start, unfrag_len); | |
1420 | ||
1421 | skb->mac_header -= frag_hdr_sz; | |
1422 | skb->network_header -= frag_hdr_sz; | |
1423 | ||
1424 | fptr = (struct frag_hdr *)(skb_network_header(skb) + unfrag_ip6hlen); | |
1425 | fptr->nexthdr = nexthdr; | |
1426 | fptr->reserved = 0; | |
87c48fa3 | 1427 | ipv6_select_ident(fptr, (struct rt6_info *)skb_dst(skb)); |
ba735425 SS |
1428 | |
1429 | /* Fragment the skb. ipv6 header and the remaining fields of the | |
1430 | * fragment header are updated in ipv6_gso_segment() | |
1431 | */ | |
1432 | segs = skb_segment(skb, features); | |
1433 | ||
1434 | out: | |
1435 | return segs; | |
1436 | } | |
1437 | ||
41135cc8 | 1438 | static const struct inet6_protocol udpv6_protocol = { |
1da177e4 LT |
1439 | .handler = udpv6_rcv, |
1440 | .err_handler = udpv6_err, | |
1441 | .flags = INET6_PROTO_NOPOLICY|INET6_PROTO_FINAL, | |
1442 | }; | |
1443 | ||
8ca896cf VY |
1444 | static const struct net_offload udpv6_offload = { |
1445 | .gso_send_check = udp6_ufo_send_check, | |
1446 | .gso_segment = udp6_ufo_fragment, | |
1447 | }; | |
1448 | ||
1da177e4 LT |
1449 | /* ------------------------------------------------------------------------ */ |
1450 | #ifdef CONFIG_PROC_FS | |
1451 | ||
1452 | static void udp6_sock_seq_show(struct seq_file *seq, struct sock *sp, int bucket) | |
1453 | { | |
1454 | struct inet_sock *inet = inet_sk(sp); | |
1455 | struct ipv6_pinfo *np = inet6_sk(sp); | |
b71d1d42 | 1456 | const struct in6_addr *dest, *src; |
1da177e4 LT |
1457 | __u16 destp, srcp; |
1458 | ||
1459 | dest = &np->daddr; | |
1460 | src = &np->rcv_saddr; | |
c720c7e8 ED |
1461 | destp = ntohs(inet->inet_dport); |
1462 | srcp = ntohs(inet->inet_sport); | |
1da177e4 | 1463 | seq_printf(seq, |
f86dcc5a | 1464 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " |
71338aa7 | 1465 | "%02X %08X:%08X %02X:%08lX %08X %5d %8d %lu %d %pK %d\n", |
1da177e4 LT |
1466 | bucket, |
1467 | src->s6_addr32[0], src->s6_addr32[1], | |
1468 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1469 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1470 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1ab1457c | 1471 | sp->sk_state, |
31e6d363 ED |
1472 | sk_wmem_alloc_get(sp), |
1473 | sk_rmem_alloc_get(sp), | |
1da177e4 | 1474 | 0, 0L, 0, |
a7cb5a49 EB |
1475 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), |
1476 | 0, | |
1da177e4 | 1477 | sock_i_ino(sp), |
cb61cb9b ED |
1478 | atomic_read(&sp->sk_refcnt), sp, |
1479 | atomic_read(&sp->sk_drops)); | |
1da177e4 LT |
1480 | } |
1481 | ||
ba4e58ec | 1482 | int udp6_seq_show(struct seq_file *seq, void *v) |
1da177e4 LT |
1483 | { |
1484 | if (v == SEQ_START_TOKEN) | |
1485 | seq_printf(seq, | |
1486 | " sl " | |
1487 | "local_address " | |
1488 | "remote_address " | |
1489 | "st tx_queue rx_queue tr tm->when retrnsmt" | |
cb61cb9b | 1490 | " uid timeout inode ref pointer drops\n"); |
1da177e4 LT |
1491 | else |
1492 | udp6_sock_seq_show(seq, v, ((struct udp_iter_state *)seq->private)->bucket); | |
1493 | return 0; | |
1494 | } | |
1495 | ||
73cb88ec AV |
1496 | static const struct file_operations udp6_afinfo_seq_fops = { |
1497 | .owner = THIS_MODULE, | |
1498 | .open = udp_seq_open, | |
1499 | .read = seq_read, | |
1500 | .llseek = seq_lseek, | |
1501 | .release = seq_release_net | |
1502 | }; | |
1503 | ||
1da177e4 | 1504 | static struct udp_seq_afinfo udp6_seq_afinfo = { |
1da177e4 LT |
1505 | .name = "udp6", |
1506 | .family = AF_INET6, | |
645ca708 | 1507 | .udp_table = &udp_table, |
73cb88ec | 1508 | .seq_fops = &udp6_afinfo_seq_fops, |
dda61925 DL |
1509 | .seq_ops = { |
1510 | .show = udp6_seq_show, | |
1511 | }, | |
1da177e4 LT |
1512 | }; |
1513 | ||
2c8c1e72 | 1514 | int __net_init udp6_proc_init(struct net *net) |
1da177e4 | 1515 | { |
0c96d8c5 | 1516 | return udp_proc_register(net, &udp6_seq_afinfo); |
1da177e4 LT |
1517 | } |
1518 | ||
0c96d8c5 DL |
1519 | void udp6_proc_exit(struct net *net) { |
1520 | udp_proc_unregister(net, &udp6_seq_afinfo); | |
1da177e4 LT |
1521 | } |
1522 | #endif /* CONFIG_PROC_FS */ | |
1523 | ||
1524 | /* ------------------------------------------------------------------------ */ | |
1525 | ||
1526 | struct proto udpv6_prot = { | |
543d9cfe ACM |
1527 | .name = "UDPv6", |
1528 | .owner = THIS_MODULE, | |
ba4e58ec | 1529 | .close = udp_lib_close, |
543d9cfe ACM |
1530 | .connect = ip6_datagram_connect, |
1531 | .disconnect = udp_disconnect, | |
1532 | .ioctl = udp_ioctl, | |
1533 | .destroy = udpv6_destroy_sock, | |
1534 | .setsockopt = udpv6_setsockopt, | |
1535 | .getsockopt = udpv6_getsockopt, | |
1536 | .sendmsg = udpv6_sendmsg, | |
1537 | .recvmsg = udpv6_recvmsg, | |
f7ad74fe | 1538 | .backlog_rcv = __udpv6_queue_rcv_skb, |
ba4e58ec GR |
1539 | .hash = udp_lib_hash, |
1540 | .unhash = udp_lib_unhash, | |
719f8358 | 1541 | .rehash = udp_v6_rehash, |
543d9cfe | 1542 | .get_port = udp_v6_get_port, |
95766fff HA |
1543 | .memory_allocated = &udp_memory_allocated, |
1544 | .sysctl_mem = sysctl_udp_mem, | |
1545 | .sysctl_wmem = &sysctl_udp_wmem_min, | |
1546 | .sysctl_rmem = &sysctl_udp_rmem_min, | |
543d9cfe | 1547 | .obj_size = sizeof(struct udp6_sock), |
271b72c7 | 1548 | .slab_flags = SLAB_DESTROY_BY_RCU, |
645ca708 | 1549 | .h.udp_table = &udp_table, |
3fdadf7d | 1550 | #ifdef CONFIG_COMPAT |
543d9cfe ACM |
1551 | .compat_setsockopt = compat_udpv6_setsockopt, |
1552 | .compat_getsockopt = compat_udpv6_getsockopt, | |
3fdadf7d | 1553 | #endif |
fcbdf09d | 1554 | .clear_sk = sk_prot_clear_portaddr_nulls, |
1da177e4 LT |
1555 | }; |
1556 | ||
1da177e4 LT |
1557 | static struct inet_protosw udpv6_protosw = { |
1558 | .type = SOCK_DGRAM, | |
1559 | .protocol = IPPROTO_UDP, | |
1560 | .prot = &udpv6_prot, | |
1561 | .ops = &inet6_dgram_ops, | |
1da177e4 LT |
1562 | .no_check = UDP_CSUM_DEFAULT, |
1563 | .flags = INET_PROTOSW_PERMANENT, | |
1564 | }; | |
1565 | ||
1566 | ||
7f4e4868 | 1567 | int __init udpv6_init(void) |
1da177e4 | 1568 | { |
7f4e4868 DL |
1569 | int ret; |
1570 | ||
3336288a | 1571 | ret = inet6_add_offload(&udpv6_offload, IPPROTO_UDP); |
7f4e4868 DL |
1572 | if (ret) |
1573 | goto out; | |
1574 | ||
3336288a VY |
1575 | ret = inet6_add_protocol(&udpv6_protocol, IPPROTO_UDP); |
1576 | if (ret) | |
1577 | goto out_offload; | |
1578 | ||
7f4e4868 DL |
1579 | ret = inet6_register_protosw(&udpv6_protosw); |
1580 | if (ret) | |
1581 | goto out_udpv6_protocol; | |
1582 | out: | |
1583 | return ret; | |
1584 | ||
1585 | out_udpv6_protocol: | |
1586 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
3336288a VY |
1587 | out_offload: |
1588 | inet6_del_offload(&udpv6_offload, IPPROTO_UDP); | |
7f4e4868 DL |
1589 | goto out; |
1590 | } | |
1591 | ||
09f7709f | 1592 | void udpv6_exit(void) |
7f4e4868 DL |
1593 | { |
1594 | inet6_unregister_protosw(&udpv6_protosw); | |
1595 | inet6_del_protocol(&udpv6_protocol, IPPROTO_UDP); | |
3336288a | 1596 | inet6_del_offload(&udpv6_offload, IPPROTO_UDP); |
1da177e4 | 1597 | } |