Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * common UDP/RAW code | |
1ab1457c | 3 | * Linux INET6 implementation |
1da177e4 LT |
4 | * |
5 | * Authors: | |
1ab1457c | 6 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 | 7 | * |
1da177e4 LT |
8 | * This program is free software; you can redistribute it and/or |
9 | * modify it under the terms of the GNU General Public License | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the License, or (at your option) any later version. | |
12 | */ | |
13 | ||
4fc268d2 | 14 | #include <linux/capability.h> |
1da177e4 LT |
15 | #include <linux/errno.h> |
16 | #include <linux/types.h> | |
17 | #include <linux/kernel.h> | |
1da177e4 LT |
18 | #include <linux/interrupt.h> |
19 | #include <linux/socket.h> | |
20 | #include <linux/sockios.h> | |
21 | #include <linux/in6.h> | |
22 | #include <linux/ipv6.h> | |
23 | #include <linux/route.h> | |
5a0e3ad6 | 24 | #include <linux/slab.h> |
a495f836 | 25 | #include <linux/export.h> |
1da177e4 LT |
26 | |
27 | #include <net/ipv6.h> | |
28 | #include <net/ndisc.h> | |
29 | #include <net/addrconf.h> | |
30 | #include <net/transp_v6.h> | |
31 | #include <net/ip6_route.h> | |
c752f073 | 32 | #include <net/tcp_states.h> |
e7219858 | 33 | #include <net/dsfield.h> |
1da177e4 LT |
34 | |
35 | #include <linux/errqueue.h> | |
36 | #include <asm/uaccess.h> | |
37 | ||
a50feda5 | 38 | static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
c15fea2d | 39 | { |
a50feda5 | 40 | return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
c15fea2d MM |
41 | } |
42 | ||
03645a11 | 43 | static int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) |
1da177e4 LT |
44 | { |
45 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
67ba4152 IM |
46 | struct inet_sock *inet = inet_sk(sk); |
47 | struct ipv6_pinfo *np = inet6_sk(sk); | |
48 | struct in6_addr *daddr, *final_p, final; | |
1da177e4 | 49 | struct dst_entry *dst; |
4c9483b2 | 50 | struct flowi6 fl6; |
1da177e4 | 51 | struct ip6_flowlabel *flowlabel = NULL; |
67ba4152 | 52 | struct ipv6_txoptions *opt; |
1da177e4 LT |
53 | int addr_type; |
54 | int err; | |
55 | ||
56 | if (usin->sin6_family == AF_INET) { | |
57 | if (__ipv6_only_sock(sk)) | |
58 | return -EAFNOSUPPORT; | |
03645a11 | 59 | err = __ip4_datagram_connect(sk, uaddr, addr_len); |
1da177e4 LT |
60 | goto ipv4_connected; |
61 | } | |
62 | ||
63 | if (addr_len < SIN6_LEN_RFC2133) | |
1ab1457c | 64 | return -EINVAL; |
1da177e4 | 65 | |
1ab1457c YH |
66 | if (usin->sin6_family != AF_INET6) |
67 | return -EAFNOSUPPORT; | |
1da177e4 | 68 | |
4c9483b2 | 69 | memset(&fl6, 0, sizeof(fl6)); |
1da177e4 | 70 | if (np->sndflow) { |
4c9483b2 DM |
71 | fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK; |
72 | if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) { | |
73 | flowlabel = fl6_sock_lookup(sk, fl6.flowlabel); | |
63159f29 | 74 | if (!flowlabel) |
1da177e4 | 75 | return -EINVAL; |
1da177e4 LT |
76 | } |
77 | } | |
78 | ||
79 | addr_type = ipv6_addr_type(&usin->sin6_addr); | |
80 | ||
81 | if (addr_type == IPV6_ADDR_ANY) { | |
82 | /* | |
83 | * connect to self | |
84 | */ | |
85 | usin->sin6_addr.s6_addr[15] = 0x01; | |
86 | } | |
87 | ||
88 | daddr = &usin->sin6_addr; | |
89 | ||
90 | if (addr_type == IPV6_ADDR_MAPPED) { | |
91 | struct sockaddr_in sin; | |
92 | ||
93 | if (__ipv6_only_sock(sk)) { | |
94 | err = -ENETUNREACH; | |
95 | goto out; | |
96 | } | |
97 | sin.sin_family = AF_INET; | |
98 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
99 | sin.sin_port = usin->sin6_port; | |
100 | ||
03645a11 ED |
101 | err = __ip4_datagram_connect(sk, |
102 | (struct sockaddr *) &sin, | |
103 | sizeof(sin)); | |
1da177e4 LT |
104 | |
105 | ipv4_connected: | |
106 | if (err) | |
107 | goto out; | |
1ab1457c | 108 | |
efe4208f | 109 | ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); |
1da177e4 | 110 | |
c15fea2d MM |
111 | if (ipv6_addr_any(&np->saddr) || |
112 | ipv6_mapped_addr_any(&np->saddr)) | |
c720c7e8 | 113 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
b301e82c | 114 | |
efe4208f ED |
115 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
116 | ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { | |
c720c7e8 | 117 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
efe4208f | 118 | &sk->sk_v6_rcv_saddr); |
719f8358 ED |
119 | if (sk->sk_prot->rehash) |
120 | sk->sk_prot->rehash(sk); | |
121 | } | |
1da177e4 | 122 | |
1da177e4 LT |
123 | goto out; |
124 | } | |
125 | ||
842df073 | 126 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1da177e4 LT |
127 | if (addr_len >= sizeof(struct sockaddr_in6) && |
128 | usin->sin6_scope_id) { | |
129 | if (sk->sk_bound_dev_if && | |
130 | sk->sk_bound_dev_if != usin->sin6_scope_id) { | |
131 | err = -EINVAL; | |
132 | goto out; | |
133 | } | |
134 | sk->sk_bound_dev_if = usin->sin6_scope_id; | |
1da177e4 LT |
135 | } |
136 | ||
1ac4f008 BH |
137 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
138 | sk->sk_bound_dev_if = np->mcast_oif; | |
139 | ||
1da177e4 LT |
140 | /* Connect to link-local address requires an interface */ |
141 | if (!sk->sk_bound_dev_if) { | |
142 | err = -EINVAL; | |
143 | goto out; | |
144 | } | |
145 | } | |
146 | ||
efe4208f | 147 | sk->sk_v6_daddr = *daddr; |
4c9483b2 | 148 | np->flow_label = fl6.flowlabel; |
1da177e4 | 149 | |
c720c7e8 | 150 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
151 | |
152 | /* | |
153 | * Check for a route to destination an obtain the | |
154 | * destination cache for it. | |
155 | */ | |
156 | ||
4c9483b2 | 157 | fl6.flowi6_proto = sk->sk_protocol; |
efe4208f | 158 | fl6.daddr = sk->sk_v6_daddr; |
4e3fd7a0 | 159 | fl6.saddr = np->saddr; |
4c9483b2 DM |
160 | fl6.flowi6_oif = sk->sk_bound_dev_if; |
161 | fl6.flowi6_mark = sk->sk_mark; | |
1958b856 DM |
162 | fl6.fl6_dport = inet->inet_dport; |
163 | fl6.fl6_sport = inet->inet_sport; | |
1da177e4 | 164 | |
4c9483b2 DM |
165 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
166 | fl6.flowi6_oif = np->mcast_oif; | |
1da177e4 | 167 | |
4c9483b2 | 168 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 169 | |
45f6fad8 ED |
170 | rcu_read_lock(); |
171 | opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); | |
4c9483b2 | 172 | final_p = fl6_update_dst(&fl6, opt, &final); |
45f6fad8 | 173 | rcu_read_unlock(); |
1da177e4 | 174 | |
0e0d44ab | 175 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
176 | err = 0; |
177 | if (IS_ERR(dst)) { | |
178 | err = PTR_ERR(dst); | |
1da177e4 | 179 | goto out; |
14e50e57 | 180 | } |
1da177e4 LT |
181 | |
182 | /* source address lookup done in ip6_dst_lookup */ | |
183 | ||
184 | if (ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 185 | np->saddr = fl6.saddr; |
1da177e4 | 186 | |
efe4208f ED |
187 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
188 | sk->sk_v6_rcv_saddr = fl6.saddr; | |
c720c7e8 | 189 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
719f8358 ED |
190 | if (sk->sk_prot->rehash) |
191 | sk->sk_prot->rehash(sk); | |
1da177e4 LT |
192 | } |
193 | ||
194 | ip6_dst_store(sk, dst, | |
efe4208f ED |
195 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
196 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 197 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 198 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
199 | &np->saddr : |
200 | #endif | |
201 | NULL); | |
1da177e4 LT |
202 | |
203 | sk->sk_state = TCP_ESTABLISHED; | |
877d1f62 | 204 | sk_set_txhash(sk); |
1da177e4 LT |
205 | out: |
206 | fl6_sock_release(flowlabel); | |
207 | return err; | |
208 | } | |
03645a11 ED |
209 | |
210 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
211 | { | |
212 | int res; | |
213 | ||
214 | lock_sock(sk); | |
215 | res = __ip6_datagram_connect(sk, uaddr, addr_len); | |
216 | release_sock(sk); | |
217 | return res; | |
218 | } | |
a495f836 | 219 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 220 | |
82b276cd HFS |
221 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
222 | int addr_len) | |
223 | { | |
224 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); | |
225 | if (sin6->sin6_family != AF_INET6) | |
226 | return -EAFNOSUPPORT; | |
227 | return ip6_datagram_connect(sk, uaddr, addr_len); | |
228 | } | |
229 | EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); | |
230 | ||
1ab1457c | 231 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 232 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
233 | { |
234 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 235 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
236 | struct sock_exterr_skb *serr; |
237 | ||
238 | if (!np->recverr) | |
239 | return; | |
240 | ||
241 | skb = skb_clone(skb, GFP_ATOMIC); | |
242 | if (!skb) | |
243 | return; | |
244 | ||
d40a4de0 BH |
245 | skb->protocol = htons(ETH_P_IPV6); |
246 | ||
1da177e4 LT |
247 | serr = SKB_EXT_ERR(skb); |
248 | serr->ee.ee_errno = err; | |
249 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 250 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
251 | serr->ee.ee_code = icmph->icmp6_code; |
252 | serr->ee.ee_pad = 0; | |
253 | serr->ee.ee_info = info; | |
254 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
255 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
256 | skb_network_header(skb); | |
1da177e4 LT |
257 | serr->port = port; |
258 | ||
1da177e4 | 259 | __skb_pull(skb, payload - skb->data); |
bd82393c | 260 | skb_reset_transport_header(skb); |
1da177e4 LT |
261 | |
262 | if (sock_queue_err_skb(sk, skb)) | |
263 | kfree_skb(skb); | |
264 | } | |
265 | ||
4c9483b2 | 266 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 | 267 | { |
1c1e9d2b | 268 | const struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 LT |
269 | struct sock_exterr_skb *serr; |
270 | struct ipv6hdr *iph; | |
271 | struct sk_buff *skb; | |
272 | ||
273 | if (!np->recverr) | |
274 | return; | |
275 | ||
276 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
277 | if (!skb) | |
278 | return; | |
279 | ||
d40a4de0 BH |
280 | skb->protocol = htons(ETH_P_IPV6); |
281 | ||
1ced98e8 ACM |
282 | skb_put(skb, sizeof(struct ipv6hdr)); |
283 | skb_reset_network_header(skb); | |
0660e03f | 284 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 285 | iph->daddr = fl6->daddr; |
1da177e4 LT |
286 | |
287 | serr = SKB_EXT_ERR(skb); | |
288 | serr->ee.ee_errno = err; | |
289 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 290 | serr->ee.ee_type = 0; |
1da177e4 LT |
291 | serr->ee.ee_code = 0; |
292 | serr->ee.ee_pad = 0; | |
293 | serr->ee.ee_info = info; | |
294 | serr->ee.ee_data = 0; | |
d56f90a7 | 295 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 296 | serr->port = fl6->fl6_dport; |
1da177e4 | 297 | |
27a884dc | 298 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 299 | skb_reset_transport_header(skb); |
1da177e4 LT |
300 | |
301 | if (sock_queue_err_skb(sk, skb)) | |
302 | kfree_skb(skb); | |
303 | } | |
304 | ||
4c9483b2 | 305 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
306 | { |
307 | struct ipv6_pinfo *np = inet6_sk(sk); | |
308 | struct ipv6hdr *iph; | |
309 | struct sk_buff *skb; | |
310 | struct ip6_mtuinfo *mtu_info; | |
311 | ||
312 | if (!np->rxopt.bits.rxpmtu) | |
313 | return; | |
314 | ||
315 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
316 | if (!skb) | |
317 | return; | |
318 | ||
319 | skb_put(skb, sizeof(struct ipv6hdr)); | |
320 | skb_reset_network_header(skb); | |
321 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 322 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
323 | |
324 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
325 | |
326 | mtu_info->ip6m_mtu = mtu; | |
327 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
328 | mtu_info->ip6m_addr.sin6_port = 0; | |
329 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 330 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 331 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
332 | |
333 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
334 | skb_reset_transport_header(skb); | |
335 | ||
336 | skb = xchg(&np->rxpmtu, skb); | |
337 | kfree_skb(skb); | |
338 | } | |
339 | ||
34b99df4 JA |
340 | /* For some errors we have valid addr_offset even with zero payload and |
341 | * zero port. Also, addr_offset should be supported if port is set. | |
342 | */ | |
343 | static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) | |
344 | { | |
345 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || | |
346 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
347 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
348 | } | |
349 | ||
c247f053 WB |
350 | /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. |
351 | * | |
352 | * At one point, excluding local errors was a quick test to identify icmp/icmp6 | |
353 | * errors. This is no longer true, but the test remained, so the v6 stack, | |
354 | * unlike v4, also honors cmsg requests on all wifi and timestamp errors. | |
355 | * | |
356 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
357 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
358 | */ | |
359 | static bool ip6_datagram_support_cmsg(struct sk_buff *skb, | |
360 | struct sock_exterr_skb *serr) | |
829ae9d6 | 361 | { |
c247f053 WB |
362 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
363 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) | |
364 | return true; | |
365 | ||
366 | if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) | |
367 | return false; | |
368 | ||
369 | if (!skb->dev) | |
370 | return false; | |
829ae9d6 WB |
371 | |
372 | if (skb->protocol == htons(ETH_P_IPV6)) | |
c247f053 | 373 | IP6CB(skb)->iif = skb->dev->ifindex; |
829ae9d6 | 374 | else |
c247f053 WB |
375 | PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; |
376 | ||
377 | return true; | |
829ae9d6 WB |
378 | } |
379 | ||
1ab1457c | 380 | /* |
1da177e4 LT |
381 | * Handle MSG_ERRQUEUE |
382 | */ | |
85fbaa75 | 383 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
384 | { |
385 | struct ipv6_pinfo *np = inet6_sk(sk); | |
386 | struct sock_exterr_skb *serr; | |
364a9e93 | 387 | struct sk_buff *skb; |
342dfc30 | 388 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
1da177e4 LT |
389 | struct { |
390 | struct sock_extended_err ee; | |
391 | struct sockaddr_in6 offender; | |
392 | } errhdr; | |
393 | int err; | |
394 | int copied; | |
395 | ||
396 | err = -EAGAIN; | |
364a9e93 | 397 | skb = sock_dequeue_err_skb(sk); |
63159f29 | 398 | if (!skb) |
1da177e4 LT |
399 | goto out; |
400 | ||
401 | copied = skb->len; | |
402 | if (copied > len) { | |
403 | msg->msg_flags |= MSG_TRUNC; | |
404 | copied = len; | |
405 | } | |
51f3d02b | 406 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
407 | if (err) |
408 | goto out_free_skb; | |
409 | ||
410 | sock_recv_timestamp(msg, sk, skb); | |
411 | ||
412 | serr = SKB_EXT_ERR(skb); | |
413 | ||
34b99df4 | 414 | if (sin && ipv6_datagram_support_addr(serr)) { |
d56f90a7 | 415 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
416 | sin->sin6_family = AF_INET6; |
417 | sin->sin6_flowinfo = 0; | |
1ab1457c | 418 | sin->sin6_port = serr->port; |
d40a4de0 | 419 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
420 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
421 | struct ipv6hdr, daddr); | |
422 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 423 | if (np->sndflow) |
6502ca52 | 424 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
842df073 HFS |
425 | sin->sin6_scope_id = |
426 | ipv6_iface_scope_id(&sin->sin6_addr, | |
427 | IP6CB(skb)->iif); | |
1da177e4 | 428 | } else { |
b301e82c BH |
429 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
430 | &sin->sin6_addr); | |
842df073 | 431 | sin->sin6_scope_id = 0; |
1da177e4 | 432 | } |
85fbaa75 | 433 | *addr_len = sizeof(*sin); |
1da177e4 LT |
434 | } |
435 | ||
436 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
437 | sin = &errhdr.offender; | |
f812116b | 438 | memset(sin, 0, sizeof(*sin)); |
c247f053 WB |
439 | |
440 | if (ip6_datagram_support_cmsg(skb, serr)) { | |
1da177e4 | 441 | sin->sin6_family = AF_INET6; |
c247f053 | 442 | if (np->rxopt.all) |
4b261c75 | 443 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
d40a4de0 | 444 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 | 445 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 | 446 | if (np->rxopt.all) |
4b261c75 | 447 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
842df073 HFS |
448 | sin->sin6_scope_id = |
449 | ipv6_iface_scope_id(&sin->sin6_addr, | |
450 | IP6CB(skb)->iif); | |
1da177e4 | 451 | } else { |
b301e82c BH |
452 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
453 | &sin->sin6_addr); | |
f812116b | 454 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
455 | ip_cmsg_recv(msg, skb); |
456 | } | |
457 | } | |
458 | ||
459 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
460 | ||
461 | /* Now we could try to dump offended packet options */ | |
462 | ||
463 | msg->msg_flags |= MSG_ERRQUEUE; | |
464 | err = copied; | |
465 | ||
1ab1457c | 466 | out_free_skb: |
1da177e4 LT |
467 | kfree_skb(skb); |
468 | out: | |
469 | return err; | |
470 | } | |
a495f836 | 471 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 472 | |
4b340ae2 BH |
473 | /* |
474 | * Handle IPV6_RECVPATHMTU | |
475 | */ | |
85fbaa75 HFS |
476 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
477 | int *addr_len) | |
4b340ae2 BH |
478 | { |
479 | struct ipv6_pinfo *np = inet6_sk(sk); | |
480 | struct sk_buff *skb; | |
4b340ae2 | 481 | struct ip6_mtuinfo mtu_info; |
342dfc30 | 482 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
4b340ae2 BH |
483 | int err; |
484 | int copied; | |
485 | ||
486 | err = -EAGAIN; | |
487 | skb = xchg(&np->rxpmtu, NULL); | |
63159f29 | 488 | if (!skb) |
4b340ae2 BH |
489 | goto out; |
490 | ||
491 | copied = skb->len; | |
492 | if (copied > len) { | |
493 | msg->msg_flags |= MSG_TRUNC; | |
494 | copied = len; | |
495 | } | |
51f3d02b | 496 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
4b340ae2 BH |
497 | if (err) |
498 | goto out_free_skb; | |
499 | ||
500 | sock_recv_timestamp(msg, sk, skb); | |
501 | ||
502 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
503 | ||
4b340ae2 BH |
504 | if (sin) { |
505 | sin->sin6_family = AF_INET6; | |
506 | sin->sin6_flowinfo = 0; | |
507 | sin->sin6_port = 0; | |
508 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 509 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
85fbaa75 | 510 | *addr_len = sizeof(*sin); |
4b340ae2 BH |
511 | } |
512 | ||
513 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
514 | ||
515 | err = copied; | |
516 | ||
517 | out_free_skb: | |
518 | kfree_skb(skb); | |
519 | out: | |
520 | return err; | |
521 | } | |
1da177e4 LT |
522 | |
523 | ||
4b261c75 HFS |
524 | void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
525 | struct sk_buff *skb) | |
1da177e4 LT |
526 | { |
527 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4b261c75 | 528 | bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
1da177e4 LT |
529 | |
530 | if (np->rxopt.bits.rxinfo) { | |
531 | struct in6_pktinfo src_info; | |
532 | ||
4b261c75 HFS |
533 | if (is_ipv6) { |
534 | src_info.ipi6_ifindex = IP6CB(skb)->iif; | |
535 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; | |
536 | } else { | |
537 | src_info.ipi6_ifindex = | |
538 | PKTINFO_SKB_CB(skb)->ipi_ifindex; | |
539 | ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, | |
540 | &src_info.ipi6_addr); | |
541 | } | |
829ae9d6 WB |
542 | |
543 | if (src_info.ipi6_ifindex >= 0) | |
544 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, | |
545 | sizeof(src_info), &src_info); | |
1da177e4 | 546 | } |
4b261c75 HFS |
547 | } |
548 | ||
549 | void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, | |
550 | struct sk_buff *skb) | |
551 | { | |
552 | struct ipv6_pinfo *np = inet6_sk(sk); | |
553 | struct inet6_skb_parm *opt = IP6CB(skb); | |
554 | unsigned char *nh = skb_network_header(skb); | |
1da177e4 LT |
555 | |
556 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 557 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
558 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
559 | } | |
560 | ||
41a1f8ea | 561 | if (np->rxopt.bits.rxtclass) { |
e7219858 | 562 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
563 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
564 | } | |
565 | ||
6502ca52 YH |
566 | if (np->rxopt.bits.rxflow) { |
567 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
568 | if (flowinfo) | |
569 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 570 | } |
333fad53 YH |
571 | |
572 | /* HbH is allowed only once */ | |
8b58a398 FW |
573 | if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
574 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
1da177e4 LT |
575 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
576 | } | |
333fad53 YH |
577 | |
578 | if (opt->lastopt && | |
579 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
580 | /* | |
581 | * Silly enough, but we need to reparse in order to | |
582 | * report extension headers (except for HbH) | |
583 | * in order. | |
584 | * | |
1ab1457c | 585 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
586 | * (and WILL NOT be) defined because |
587 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
588 | */ | |
589 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 590 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
591 | |
592 | while (off <= opt->lastopt) { | |
95c96174 | 593 | unsigned int len; |
d56f90a7 | 594 | u8 *ptr = nh + off; |
333fad53 | 595 | |
b5a4257c | 596 | switch (nexthdr) { |
333fad53 YH |
597 | case IPPROTO_DSTOPTS: |
598 | nexthdr = ptr[0]; | |
599 | len = (ptr[1] + 1) << 3; | |
600 | if (np->rxopt.bits.dstopts) | |
601 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
602 | break; | |
603 | case IPPROTO_ROUTING: | |
604 | nexthdr = ptr[0]; | |
605 | len = (ptr[1] + 1) << 3; | |
606 | if (np->rxopt.bits.srcrt) | |
607 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
608 | break; | |
609 | case IPPROTO_AH: | |
610 | nexthdr = ptr[0]; | |
a3059893 | 611 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
612 | break; |
613 | default: | |
614 | nexthdr = ptr[0]; | |
615 | len = (ptr[1] + 1) << 3; | |
616 | break; | |
617 | } | |
618 | ||
619 | off += len; | |
620 | } | |
621 | } | |
622 | ||
623 | /* socket options in old style */ | |
624 | if (np->rxopt.bits.rxoinfo) { | |
625 | struct in6_pktinfo src_info; | |
626 | ||
627 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 628 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
629 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
630 | } | |
631 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 632 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
633 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
634 | } | |
8b58a398 FW |
635 | if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
636 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
333fad53 YH |
637 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
638 | } | |
639 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 640 | u8 *ptr = nh + opt->dst0; |
333fad53 | 641 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 642 | } |
333fad53 | 643 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 644 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 645 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 646 | } |
333fad53 | 647 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 648 | u8 *ptr = nh + opt->dst1; |
333fad53 | 649 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 650 | } |
6c468622 BS |
651 | if (np->rxopt.bits.rxorigdstaddr) { |
652 | struct sockaddr_in6 sin6; | |
747465ef | 653 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
654 | |
655 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
656 | /* All current transport protocols have the port numbers in the | |
657 | * first four bytes of the transport header and this function is | |
658 | * written with this assumption in mind. | |
659 | */ | |
660 | ||
661 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 662 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
663 | sin6.sin6_port = ports[1]; |
664 | sin6.sin6_flowinfo = 0; | |
3868b7aa HFS |
665 | sin6.sin6_scope_id = |
666 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, | |
667 | opt->iif); | |
6c468622 BS |
668 | |
669 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
670 | } | |
671 | } | |
4b261c75 HFS |
672 | } |
673 | ||
674 | void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, | |
675 | struct sk_buff *skb) | |
676 | { | |
677 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
678 | ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
1da177e4 | 679 | } |
8e72d37e | 680 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 681 | |
73df66f8 TP |
682 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
683 | struct msghdr *msg, struct flowi6 *fl6, | |
684 | struct ipv6_txoptions *opt, | |
685 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
686 | { |
687 | struct in6_pktinfo *src_info; | |
688 | struct cmsghdr *cmsg; | |
689 | struct ipv6_rt_hdr *rthdr; | |
690 | struct ipv6_opt_hdr *hdr; | |
691 | int len; | |
692 | int err = 0; | |
693 | ||
f95b414e | 694 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 | 695 | int addr_type; |
1da177e4 LT |
696 | |
697 | if (!CMSG_OK(msg, cmsg)) { | |
698 | err = -EINVAL; | |
699 | goto exit_f; | |
700 | } | |
701 | ||
702 | if (cmsg->cmsg_level != SOL_IPV6) | |
703 | continue; | |
704 | ||
705 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
706 | case IPV6_PKTINFO: |
707 | case IPV6_2292PKTINFO: | |
187e3838 YH |
708 | { |
709 | struct net_device *dev = NULL; | |
710 | ||
1ab1457c | 711 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
712 | err = -EINVAL; |
713 | goto exit_f; | |
714 | } | |
715 | ||
716 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 717 | |
1da177e4 | 718 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
719 | if (fl6->flowi6_oif && |
720 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 721 | return -EINVAL; |
4c9483b2 | 722 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
723 | } |
724 | ||
187e3838 | 725 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 726 | |
536b2e92 | 727 | rcu_read_lock(); |
4c9483b2 DM |
728 | if (fl6->flowi6_oif) { |
729 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
730 | if (!dev) { |
731 | rcu_read_unlock(); | |
187e3838 | 732 | return -ENODEV; |
536b2e92 ED |
733 | } |
734 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
735 | rcu_read_unlock(); | |
187e3838 | 736 | return -EINVAL; |
536b2e92 | 737 | } |
1ab1457c | 738 | |
187e3838 YH |
739 | if (addr_type != IPV6_ADDR_ANY) { |
740 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 741 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 742 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
7c90cc2d FLB |
743 | strict ? dev : NULL, 0) && |
744 | !ipv6_chk_acast_addr_src(net, dev, | |
745 | &src_info->ipi6_addr)) | |
187e3838 YH |
746 | err = -EINVAL; |
747 | else | |
4e3fd7a0 | 748 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 749 | } |
187e3838 | 750 | |
536b2e92 | 751 | rcu_read_unlock(); |
1da177e4 | 752 | |
187e3838 YH |
753 | if (err) |
754 | goto exit_f; | |
755 | ||
1da177e4 | 756 | break; |
187e3838 | 757 | } |
1da177e4 LT |
758 | |
759 | case IPV6_FLOWINFO: | |
1ab1457c | 760 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
761 | err = -EINVAL; |
762 | goto exit_f; | |
763 | } | |
764 | ||
4c9483b2 DM |
765 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
766 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
767 | err = -EINVAL; |
768 | goto exit_f; | |
769 | } | |
770 | } | |
4c9483b2 | 771 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
772 | break; |
773 | ||
333fad53 | 774 | case IPV6_2292HOPOPTS: |
1da177e4 | 775 | case IPV6_HOPOPTS: |
1ab1457c | 776 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
777 | err = -EINVAL; |
778 | goto exit_f; | |
779 | } | |
780 | ||
781 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
782 | len = ((hdr->hdrlen + 1) << 3); | |
783 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
784 | err = -EINVAL; | |
785 | goto exit_f; | |
786 | } | |
af31f412 | 787 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
788 | err = -EPERM; |
789 | goto exit_f; | |
790 | } | |
791 | opt->opt_nflen += len; | |
792 | opt->hopopt = hdr; | |
793 | break; | |
794 | ||
333fad53 | 795 | case IPV6_2292DSTOPTS: |
1ab1457c | 796 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
797 | err = -EINVAL; |
798 | goto exit_f; | |
799 | } | |
800 | ||
801 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
802 | len = ((hdr->hdrlen + 1) << 3); | |
803 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
804 | err = -EINVAL; | |
805 | goto exit_f; | |
806 | } | |
af31f412 | 807 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
808 | err = -EPERM; |
809 | goto exit_f; | |
810 | } | |
811 | if (opt->dst1opt) { | |
812 | err = -EINVAL; | |
813 | goto exit_f; | |
814 | } | |
815 | opt->opt_flen += len; | |
816 | opt->dst1opt = hdr; | |
817 | break; | |
818 | ||
333fad53 YH |
819 | case IPV6_DSTOPTS: |
820 | case IPV6_RTHDRDSTOPTS: | |
821 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
822 | err = -EINVAL; | |
823 | goto exit_f; | |
824 | } | |
825 | ||
826 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
827 | len = ((hdr->hdrlen + 1) << 3); | |
828 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
829 | err = -EINVAL; | |
830 | goto exit_f; | |
831 | } | |
af31f412 | 832 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
833 | err = -EPERM; |
834 | goto exit_f; | |
835 | } | |
836 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
837 | opt->opt_flen += len; | |
838 | opt->dst1opt = hdr; | |
839 | } else { | |
840 | opt->opt_nflen += len; | |
841 | opt->dst0opt = hdr; | |
842 | } | |
843 | break; | |
844 | ||
845 | case IPV6_2292RTHDR: | |
1da177e4 | 846 | case IPV6_RTHDR: |
1ab1457c | 847 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
848 | err = -EINVAL; |
849 | goto exit_f; | |
850 | } | |
851 | ||
852 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
853 | ||
280a9d34 | 854 | switch (rthdr->type) { |
07a93626 | 855 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 856 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
857 | if (rthdr->hdrlen != 2 || |
858 | rthdr->segments_left != 1) { | |
859 | err = -EINVAL; | |
860 | goto exit_f; | |
861 | } | |
280a9d34 | 862 | break; |
bb4dbf9e | 863 | #endif |
280a9d34 | 864 | default: |
1da177e4 LT |
865 | err = -EINVAL; |
866 | goto exit_f; | |
867 | } | |
868 | ||
869 | len = ((rthdr->hdrlen + 1) << 3); | |
870 | ||
1ab1457c | 871 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
872 | err = -EINVAL; |
873 | goto exit_f; | |
874 | } | |
875 | ||
876 | /* segments left must also match */ | |
877 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
878 | err = -EINVAL; | |
879 | goto exit_f; | |
880 | } | |
881 | ||
882 | opt->opt_nflen += len; | |
883 | opt->srcrt = rthdr; | |
884 | ||
333fad53 | 885 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
886 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
887 | ||
888 | opt->opt_nflen += dsthdrlen; | |
889 | opt->dst0opt = opt->dst1opt; | |
890 | opt->dst1opt = NULL; | |
891 | opt->opt_flen -= dsthdrlen; | |
892 | } | |
893 | ||
894 | break; | |
895 | ||
333fad53 | 896 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
897 | case IPV6_HOPLIMIT: |
898 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
899 | err = -EINVAL; | |
900 | goto exit_f; | |
901 | } | |
902 | ||
903 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
904 | if (*hlimit < -1 || *hlimit > 0xff) { |
905 | err = -EINVAL; | |
906 | goto exit_f; | |
907 | } | |
908 | ||
1da177e4 LT |
909 | break; |
910 | ||
41a1f8ea YH |
911 | case IPV6_TCLASS: |
912 | { | |
913 | int tc; | |
914 | ||
915 | err = -EINVAL; | |
b5a4257c | 916 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 917 | goto exit_f; |
41a1f8ea YH |
918 | |
919 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 920 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
921 | goto exit_f; |
922 | ||
923 | err = 0; | |
924 | *tclass = tc; | |
925 | ||
13b52cd4 BH |
926 | break; |
927 | } | |
928 | ||
929 | case IPV6_DONTFRAG: | |
930 | { | |
931 | int df; | |
932 | ||
933 | err = -EINVAL; | |
b5a4257c | 934 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 935 | goto exit_f; |
13b52cd4 BH |
936 | |
937 | df = *(int *)CMSG_DATA(cmsg); | |
938 | if (df < 0 || df > 1) | |
939 | goto exit_f; | |
940 | ||
941 | err = 0; | |
942 | *dontfrag = df; | |
943 | ||
41a1f8ea YH |
944 | break; |
945 | } | |
1da177e4 | 946 | default: |
ba7a46f1 JP |
947 | net_dbg_ratelimited("invalid cmsg type: %d\n", |
948 | cmsg->cmsg_type); | |
1da177e4 | 949 | err = -EINVAL; |
4a36702e | 950 | goto exit_f; |
3ff50b79 | 951 | } |
1da177e4 LT |
952 | } |
953 | ||
954 | exit_f: | |
955 | return err; | |
956 | } | |
73df66f8 | 957 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
17ef66af LC |
958 | |
959 | void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, | |
960 | __u16 srcp, __u16 destp, int bucket) | |
961 | { | |
17ef66af LC |
962 | const struct in6_addr *dest, *src; |
963 | ||
efe4208f ED |
964 | dest = &sp->sk_v6_daddr; |
965 | src = &sp->sk_v6_rcv_saddr; | |
17ef66af LC |
966 | seq_printf(seq, |
967 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 968 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", |
17ef66af LC |
969 | bucket, |
970 | src->s6_addr32[0], src->s6_addr32[1], | |
971 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
972 | dest->s6_addr32[0], dest->s6_addr32[1], | |
973 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
974 | sp->sk_state, | |
975 | sk_wmem_alloc_get(sp), | |
976 | sk_rmem_alloc_get(sp), | |
977 | 0, 0L, 0, | |
978 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), | |
979 | 0, | |
980 | sock_i_ino(sp), | |
981 | atomic_read(&sp->sk_refcnt), sp, | |
982 | atomic_read(&sp->sk_drops)); | |
983 | } |