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Commit | Line | Data |
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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 | |
1cdda918 PA |
165 | if (!fl6.flowi6_oif) |
166 | fl6.flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
167 | ||
4c9483b2 DM |
168 | if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST)) |
169 | fl6.flowi6_oif = np->mcast_oif; | |
1da177e4 | 170 | |
4c9483b2 | 171 | security_sk_classify_flow(sk, flowi6_to_flowi(&fl6)); |
beb8d13b | 172 | |
45f6fad8 ED |
173 | rcu_read_lock(); |
174 | opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); | |
4c9483b2 | 175 | final_p = fl6_update_dst(&fl6, opt, &final); |
45f6fad8 | 176 | rcu_read_unlock(); |
1da177e4 | 177 | |
0e0d44ab | 178 | dst = ip6_dst_lookup_flow(sk, &fl6, final_p); |
68d0c6d3 DM |
179 | err = 0; |
180 | if (IS_ERR(dst)) { | |
181 | err = PTR_ERR(dst); | |
1da177e4 | 182 | goto out; |
14e50e57 | 183 | } |
1da177e4 LT |
184 | |
185 | /* source address lookup done in ip6_dst_lookup */ | |
186 | ||
187 | if (ipv6_addr_any(&np->saddr)) | |
4e3fd7a0 | 188 | np->saddr = fl6.saddr; |
1da177e4 | 189 | |
efe4208f ED |
190 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
191 | sk->sk_v6_rcv_saddr = fl6.saddr; | |
c720c7e8 | 192 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; |
719f8358 ED |
193 | if (sk->sk_prot->rehash) |
194 | sk->sk_prot->rehash(sk); | |
1da177e4 LT |
195 | } |
196 | ||
197 | ip6_dst_store(sk, dst, | |
efe4208f ED |
198 | ipv6_addr_equal(&fl6.daddr, &sk->sk_v6_daddr) ? |
199 | &sk->sk_v6_daddr : NULL, | |
8e1ef0a9 | 200 | #ifdef CONFIG_IPV6_SUBTREES |
4c9483b2 | 201 | ipv6_addr_equal(&fl6.saddr, &np->saddr) ? |
8e1ef0a9 YH |
202 | &np->saddr : |
203 | #endif | |
204 | NULL); | |
1da177e4 LT |
205 | |
206 | sk->sk_state = TCP_ESTABLISHED; | |
877d1f62 | 207 | sk_set_txhash(sk); |
1da177e4 LT |
208 | out: |
209 | fl6_sock_release(flowlabel); | |
210 | return err; | |
211 | } | |
03645a11 ED |
212 | |
213 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
214 | { | |
215 | int res; | |
216 | ||
217 | lock_sock(sk); | |
218 | res = __ip6_datagram_connect(sk, uaddr, addr_len); | |
219 | release_sock(sk); | |
220 | return res; | |
221 | } | |
a495f836 | 222 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 223 | |
82b276cd HFS |
224 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
225 | int addr_len) | |
226 | { | |
227 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); | |
228 | if (sin6->sin6_family != AF_INET6) | |
229 | return -EAFNOSUPPORT; | |
230 | return ip6_datagram_connect(sk, uaddr, addr_len); | |
231 | } | |
232 | EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); | |
233 | ||
1ab1457c | 234 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 235 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
236 | { |
237 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 238 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
239 | struct sock_exterr_skb *serr; |
240 | ||
241 | if (!np->recverr) | |
242 | return; | |
243 | ||
244 | skb = skb_clone(skb, GFP_ATOMIC); | |
245 | if (!skb) | |
246 | return; | |
247 | ||
d40a4de0 BH |
248 | skb->protocol = htons(ETH_P_IPV6); |
249 | ||
1da177e4 LT |
250 | serr = SKB_EXT_ERR(skb); |
251 | serr->ee.ee_errno = err; | |
252 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 253 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
254 | serr->ee.ee_code = icmph->icmp6_code; |
255 | serr->ee.ee_pad = 0; | |
256 | serr->ee.ee_info = info; | |
257 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
258 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
259 | skb_network_header(skb); | |
1da177e4 LT |
260 | serr->port = port; |
261 | ||
1da177e4 | 262 | __skb_pull(skb, payload - skb->data); |
bd82393c | 263 | skb_reset_transport_header(skb); |
1da177e4 LT |
264 | |
265 | if (sock_queue_err_skb(sk, skb)) | |
266 | kfree_skb(skb); | |
267 | } | |
268 | ||
4c9483b2 | 269 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 | 270 | { |
1c1e9d2b | 271 | const struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 LT |
272 | struct sock_exterr_skb *serr; |
273 | struct ipv6hdr *iph; | |
274 | struct sk_buff *skb; | |
275 | ||
276 | if (!np->recverr) | |
277 | return; | |
278 | ||
279 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
280 | if (!skb) | |
281 | return; | |
282 | ||
d40a4de0 BH |
283 | skb->protocol = htons(ETH_P_IPV6); |
284 | ||
1ced98e8 ACM |
285 | skb_put(skb, sizeof(struct ipv6hdr)); |
286 | skb_reset_network_header(skb); | |
0660e03f | 287 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 288 | iph->daddr = fl6->daddr; |
1da177e4 LT |
289 | |
290 | serr = SKB_EXT_ERR(skb); | |
291 | serr->ee.ee_errno = err; | |
292 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 293 | serr->ee.ee_type = 0; |
1da177e4 LT |
294 | serr->ee.ee_code = 0; |
295 | serr->ee.ee_pad = 0; | |
296 | serr->ee.ee_info = info; | |
297 | serr->ee.ee_data = 0; | |
d56f90a7 | 298 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 299 | serr->port = fl6->fl6_dport; |
1da177e4 | 300 | |
27a884dc | 301 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 302 | skb_reset_transport_header(skb); |
1da177e4 LT |
303 | |
304 | if (sock_queue_err_skb(sk, skb)) | |
305 | kfree_skb(skb); | |
306 | } | |
307 | ||
4c9483b2 | 308 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
309 | { |
310 | struct ipv6_pinfo *np = inet6_sk(sk); | |
311 | struct ipv6hdr *iph; | |
312 | struct sk_buff *skb; | |
313 | struct ip6_mtuinfo *mtu_info; | |
314 | ||
315 | if (!np->rxopt.bits.rxpmtu) | |
316 | return; | |
317 | ||
318 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
319 | if (!skb) | |
320 | return; | |
321 | ||
322 | skb_put(skb, sizeof(struct ipv6hdr)); | |
323 | skb_reset_network_header(skb); | |
324 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 325 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
326 | |
327 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
328 | |
329 | mtu_info->ip6m_mtu = mtu; | |
330 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
331 | mtu_info->ip6m_addr.sin6_port = 0; | |
332 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 333 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 334 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
335 | |
336 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
337 | skb_reset_transport_header(skb); | |
338 | ||
339 | skb = xchg(&np->rxpmtu, skb); | |
340 | kfree_skb(skb); | |
341 | } | |
342 | ||
34b99df4 JA |
343 | /* For some errors we have valid addr_offset even with zero payload and |
344 | * zero port. Also, addr_offset should be supported if port is set. | |
345 | */ | |
346 | static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) | |
347 | { | |
348 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || | |
349 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
350 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
351 | } | |
352 | ||
c247f053 WB |
353 | /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. |
354 | * | |
355 | * At one point, excluding local errors was a quick test to identify icmp/icmp6 | |
356 | * errors. This is no longer true, but the test remained, so the v6 stack, | |
357 | * unlike v4, also honors cmsg requests on all wifi and timestamp errors. | |
358 | * | |
359 | * Timestamp code paths do not initialize the fields expected by cmsg: | |
360 | * the PKTINFO fields in skb->cb[]. Fill those in here. | |
361 | */ | |
362 | static bool ip6_datagram_support_cmsg(struct sk_buff *skb, | |
363 | struct sock_exterr_skb *serr) | |
829ae9d6 | 364 | { |
c247f053 WB |
365 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
366 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) | |
367 | return true; | |
368 | ||
369 | if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) | |
370 | return false; | |
371 | ||
372 | if (!skb->dev) | |
373 | return false; | |
829ae9d6 WB |
374 | |
375 | if (skb->protocol == htons(ETH_P_IPV6)) | |
c247f053 | 376 | IP6CB(skb)->iif = skb->dev->ifindex; |
829ae9d6 | 377 | else |
c247f053 WB |
378 | PKTINFO_SKB_CB(skb)->ipi_ifindex = skb->dev->ifindex; |
379 | ||
380 | return true; | |
829ae9d6 WB |
381 | } |
382 | ||
1ab1457c | 383 | /* |
1da177e4 LT |
384 | * Handle MSG_ERRQUEUE |
385 | */ | |
85fbaa75 | 386 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
387 | { |
388 | struct ipv6_pinfo *np = inet6_sk(sk); | |
389 | struct sock_exterr_skb *serr; | |
364a9e93 | 390 | struct sk_buff *skb; |
342dfc30 | 391 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
1da177e4 LT |
392 | struct { |
393 | struct sock_extended_err ee; | |
394 | struct sockaddr_in6 offender; | |
395 | } errhdr; | |
396 | int err; | |
397 | int copied; | |
398 | ||
399 | err = -EAGAIN; | |
364a9e93 | 400 | skb = sock_dequeue_err_skb(sk); |
63159f29 | 401 | if (!skb) |
1da177e4 LT |
402 | goto out; |
403 | ||
404 | copied = skb->len; | |
405 | if (copied > len) { | |
406 | msg->msg_flags |= MSG_TRUNC; | |
407 | copied = len; | |
408 | } | |
51f3d02b | 409 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
1da177e4 LT |
410 | if (err) |
411 | goto out_free_skb; | |
412 | ||
413 | sock_recv_timestamp(msg, sk, skb); | |
414 | ||
415 | serr = SKB_EXT_ERR(skb); | |
416 | ||
34b99df4 | 417 | if (sin && ipv6_datagram_support_addr(serr)) { |
d56f90a7 | 418 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
419 | sin->sin6_family = AF_INET6; |
420 | sin->sin6_flowinfo = 0; | |
1ab1457c | 421 | sin->sin6_port = serr->port; |
d40a4de0 | 422 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
423 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
424 | struct ipv6hdr, daddr); | |
425 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 426 | if (np->sndflow) |
6502ca52 | 427 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
842df073 HFS |
428 | sin->sin6_scope_id = |
429 | ipv6_iface_scope_id(&sin->sin6_addr, | |
430 | IP6CB(skb)->iif); | |
1da177e4 | 431 | } else { |
b301e82c BH |
432 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
433 | &sin->sin6_addr); | |
842df073 | 434 | sin->sin6_scope_id = 0; |
1da177e4 | 435 | } |
85fbaa75 | 436 | *addr_len = sizeof(*sin); |
1da177e4 LT |
437 | } |
438 | ||
439 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
440 | sin = &errhdr.offender; | |
f812116b | 441 | memset(sin, 0, sizeof(*sin)); |
c247f053 WB |
442 | |
443 | if (ip6_datagram_support_cmsg(skb, serr)) { | |
1da177e4 | 444 | sin->sin6_family = AF_INET6; |
c247f053 | 445 | if (np->rxopt.all) |
4b261c75 | 446 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
d40a4de0 | 447 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 | 448 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 | 449 | if (np->rxopt.all) |
4b261c75 | 450 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
842df073 HFS |
451 | sin->sin6_scope_id = |
452 | ipv6_iface_scope_id(&sin->sin6_addr, | |
453 | IP6CB(skb)->iif); | |
1da177e4 | 454 | } else { |
b301e82c BH |
455 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
456 | &sin->sin6_addr); | |
f812116b | 457 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
458 | ip_cmsg_recv(msg, skb); |
459 | } | |
460 | } | |
461 | ||
462 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
463 | ||
464 | /* Now we could try to dump offended packet options */ | |
465 | ||
466 | msg->msg_flags |= MSG_ERRQUEUE; | |
467 | err = copied; | |
468 | ||
1ab1457c | 469 | out_free_skb: |
1da177e4 LT |
470 | kfree_skb(skb); |
471 | out: | |
472 | return err; | |
473 | } | |
a495f836 | 474 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 475 | |
4b340ae2 BH |
476 | /* |
477 | * Handle IPV6_RECVPATHMTU | |
478 | */ | |
85fbaa75 HFS |
479 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
480 | int *addr_len) | |
4b340ae2 BH |
481 | { |
482 | struct ipv6_pinfo *np = inet6_sk(sk); | |
483 | struct sk_buff *skb; | |
4b340ae2 | 484 | struct ip6_mtuinfo mtu_info; |
342dfc30 | 485 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
4b340ae2 BH |
486 | int err; |
487 | int copied; | |
488 | ||
489 | err = -EAGAIN; | |
490 | skb = xchg(&np->rxpmtu, NULL); | |
63159f29 | 491 | if (!skb) |
4b340ae2 BH |
492 | goto out; |
493 | ||
494 | copied = skb->len; | |
495 | if (copied > len) { | |
496 | msg->msg_flags |= MSG_TRUNC; | |
497 | copied = len; | |
498 | } | |
51f3d02b | 499 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
4b340ae2 BH |
500 | if (err) |
501 | goto out_free_skb; | |
502 | ||
503 | sock_recv_timestamp(msg, sk, skb); | |
504 | ||
505 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
506 | ||
4b340ae2 BH |
507 | if (sin) { |
508 | sin->sin6_family = AF_INET6; | |
509 | sin->sin6_flowinfo = 0; | |
510 | sin->sin6_port = 0; | |
511 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 512 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
85fbaa75 | 513 | *addr_len = sizeof(*sin); |
4b340ae2 BH |
514 | } |
515 | ||
516 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
517 | ||
518 | err = copied; | |
519 | ||
520 | out_free_skb: | |
521 | kfree_skb(skb); | |
522 | out: | |
523 | return err; | |
524 | } | |
1da177e4 LT |
525 | |
526 | ||
4b261c75 HFS |
527 | void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
528 | struct sk_buff *skb) | |
1da177e4 LT |
529 | { |
530 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4b261c75 | 531 | bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
1da177e4 LT |
532 | |
533 | if (np->rxopt.bits.rxinfo) { | |
534 | struct in6_pktinfo src_info; | |
535 | ||
4b261c75 HFS |
536 | if (is_ipv6) { |
537 | src_info.ipi6_ifindex = IP6CB(skb)->iif; | |
538 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; | |
539 | } else { | |
540 | src_info.ipi6_ifindex = | |
541 | PKTINFO_SKB_CB(skb)->ipi_ifindex; | |
542 | ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, | |
543 | &src_info.ipi6_addr); | |
544 | } | |
829ae9d6 WB |
545 | |
546 | if (src_info.ipi6_ifindex >= 0) | |
547 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, | |
548 | sizeof(src_info), &src_info); | |
1da177e4 | 549 | } |
4b261c75 HFS |
550 | } |
551 | ||
552 | void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, | |
553 | struct sk_buff *skb) | |
554 | { | |
555 | struct ipv6_pinfo *np = inet6_sk(sk); | |
556 | struct inet6_skb_parm *opt = IP6CB(skb); | |
557 | unsigned char *nh = skb_network_header(skb); | |
1da177e4 LT |
558 | |
559 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 560 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
561 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
562 | } | |
563 | ||
41a1f8ea | 564 | if (np->rxopt.bits.rxtclass) { |
e7219858 | 565 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
566 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
567 | } | |
568 | ||
6502ca52 YH |
569 | if (np->rxopt.bits.rxflow) { |
570 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
571 | if (flowinfo) | |
572 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 573 | } |
333fad53 YH |
574 | |
575 | /* HbH is allowed only once */ | |
8b58a398 FW |
576 | if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
577 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
1da177e4 LT |
578 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
579 | } | |
333fad53 YH |
580 | |
581 | if (opt->lastopt && | |
582 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
583 | /* | |
584 | * Silly enough, but we need to reparse in order to | |
585 | * report extension headers (except for HbH) | |
586 | * in order. | |
587 | * | |
1ab1457c | 588 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
589 | * (and WILL NOT be) defined because |
590 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
591 | */ | |
592 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 593 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
594 | |
595 | while (off <= opt->lastopt) { | |
95c96174 | 596 | unsigned int len; |
d56f90a7 | 597 | u8 *ptr = nh + off; |
333fad53 | 598 | |
b5a4257c | 599 | switch (nexthdr) { |
333fad53 YH |
600 | case IPPROTO_DSTOPTS: |
601 | nexthdr = ptr[0]; | |
602 | len = (ptr[1] + 1) << 3; | |
603 | if (np->rxopt.bits.dstopts) | |
604 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
605 | break; | |
606 | case IPPROTO_ROUTING: | |
607 | nexthdr = ptr[0]; | |
608 | len = (ptr[1] + 1) << 3; | |
609 | if (np->rxopt.bits.srcrt) | |
610 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
611 | break; | |
612 | case IPPROTO_AH: | |
613 | nexthdr = ptr[0]; | |
a3059893 | 614 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
615 | break; |
616 | default: | |
617 | nexthdr = ptr[0]; | |
618 | len = (ptr[1] + 1) << 3; | |
619 | break; | |
620 | } | |
621 | ||
622 | off += len; | |
623 | } | |
624 | } | |
625 | ||
626 | /* socket options in old style */ | |
627 | if (np->rxopt.bits.rxoinfo) { | |
628 | struct in6_pktinfo src_info; | |
629 | ||
630 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 631 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
632 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
633 | } | |
634 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 635 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
636 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
637 | } | |
8b58a398 FW |
638 | if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
639 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
333fad53 YH |
640 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
641 | } | |
642 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 643 | u8 *ptr = nh + opt->dst0; |
333fad53 | 644 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 645 | } |
333fad53 | 646 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 647 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 648 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 649 | } |
333fad53 | 650 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 651 | u8 *ptr = nh + opt->dst1; |
333fad53 | 652 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 653 | } |
6c468622 BS |
654 | if (np->rxopt.bits.rxorigdstaddr) { |
655 | struct sockaddr_in6 sin6; | |
747465ef | 656 | __be16 *ports = (__be16 *) skb_transport_header(skb); |
6c468622 BS |
657 | |
658 | if (skb_transport_offset(skb) + 4 <= skb->len) { | |
659 | /* All current transport protocols have the port numbers in the | |
660 | * first four bytes of the transport header and this function is | |
661 | * written with this assumption in mind. | |
662 | */ | |
663 | ||
664 | sin6.sin6_family = AF_INET6; | |
4e3fd7a0 | 665 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
666 | sin6.sin6_port = ports[1]; |
667 | sin6.sin6_flowinfo = 0; | |
3868b7aa HFS |
668 | sin6.sin6_scope_id = |
669 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, | |
670 | opt->iif); | |
6c468622 BS |
671 | |
672 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
673 | } | |
674 | } | |
4b261c75 HFS |
675 | } |
676 | ||
677 | void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, | |
678 | struct sk_buff *skb) | |
679 | { | |
680 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
681 | ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
1da177e4 | 682 | } |
8e72d37e | 683 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 684 | |
73df66f8 TP |
685 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
686 | struct msghdr *msg, struct flowi6 *fl6, | |
687 | struct ipv6_txoptions *opt, | |
688 | int *hlimit, int *tclass, int *dontfrag) | |
1da177e4 LT |
689 | { |
690 | struct in6_pktinfo *src_info; | |
691 | struct cmsghdr *cmsg; | |
692 | struct ipv6_rt_hdr *rthdr; | |
693 | struct ipv6_opt_hdr *hdr; | |
694 | int len; | |
695 | int err = 0; | |
696 | ||
f95b414e | 697 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 | 698 | int addr_type; |
1da177e4 LT |
699 | |
700 | if (!CMSG_OK(msg, cmsg)) { | |
701 | err = -EINVAL; | |
702 | goto exit_f; | |
703 | } | |
704 | ||
705 | if (cmsg->cmsg_level != SOL_IPV6) | |
706 | continue; | |
707 | ||
708 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
709 | case IPV6_PKTINFO: |
710 | case IPV6_2292PKTINFO: | |
187e3838 YH |
711 | { |
712 | struct net_device *dev = NULL; | |
713 | ||
1ab1457c | 714 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
715 | err = -EINVAL; |
716 | goto exit_f; | |
717 | } | |
718 | ||
719 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
1ab1457c | 720 | |
1da177e4 | 721 | if (src_info->ipi6_ifindex) { |
4c9483b2 DM |
722 | if (fl6->flowi6_oif && |
723 | src_info->ipi6_ifindex != fl6->flowi6_oif) | |
1da177e4 | 724 | return -EINVAL; |
4c9483b2 | 725 | fl6->flowi6_oif = src_info->ipi6_ifindex; |
1da177e4 LT |
726 | } |
727 | ||
187e3838 | 728 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 729 | |
536b2e92 | 730 | rcu_read_lock(); |
4c9483b2 DM |
731 | if (fl6->flowi6_oif) { |
732 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
733 | if (!dev) { |
734 | rcu_read_unlock(); | |
187e3838 | 735 | return -ENODEV; |
536b2e92 ED |
736 | } |
737 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
738 | rcu_read_unlock(); | |
187e3838 | 739 | return -EINVAL; |
536b2e92 | 740 | } |
1ab1457c | 741 | |
187e3838 YH |
742 | if (addr_type != IPV6_ADDR_ANY) { |
743 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
2563fa59 | 744 | if (!(inet_sk(sk)->freebind || inet_sk(sk)->transparent) && |
ec0506db | 745 | !ipv6_chk_addr(net, &src_info->ipi6_addr, |
7c90cc2d FLB |
746 | strict ? dev : NULL, 0) && |
747 | !ipv6_chk_acast_addr_src(net, dev, | |
748 | &src_info->ipi6_addr)) | |
187e3838 YH |
749 | err = -EINVAL; |
750 | else | |
4e3fd7a0 | 751 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 752 | } |
187e3838 | 753 | |
536b2e92 | 754 | rcu_read_unlock(); |
1da177e4 | 755 | |
187e3838 YH |
756 | if (err) |
757 | goto exit_f; | |
758 | ||
1da177e4 | 759 | break; |
187e3838 | 760 | } |
1da177e4 LT |
761 | |
762 | case IPV6_FLOWINFO: | |
1ab1457c | 763 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
764 | err = -EINVAL; |
765 | goto exit_f; | |
766 | } | |
767 | ||
4c9483b2 DM |
768 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
769 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
770 | err = -EINVAL; |
771 | goto exit_f; | |
772 | } | |
773 | } | |
4c9483b2 | 774 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
775 | break; |
776 | ||
333fad53 | 777 | case IPV6_2292HOPOPTS: |
1da177e4 | 778 | case IPV6_HOPOPTS: |
1ab1457c | 779 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
780 | err = -EINVAL; |
781 | goto exit_f; | |
782 | } | |
783 | ||
784 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
785 | len = ((hdr->hdrlen + 1) << 3); | |
786 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
787 | err = -EINVAL; | |
788 | goto exit_f; | |
789 | } | |
af31f412 | 790 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
791 | err = -EPERM; |
792 | goto exit_f; | |
793 | } | |
794 | opt->opt_nflen += len; | |
795 | opt->hopopt = hdr; | |
796 | break; | |
797 | ||
333fad53 | 798 | case IPV6_2292DSTOPTS: |
1ab1457c | 799 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
800 | err = -EINVAL; |
801 | goto exit_f; | |
802 | } | |
803 | ||
804 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
805 | len = ((hdr->hdrlen + 1) << 3); | |
806 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
807 | err = -EINVAL; | |
808 | goto exit_f; | |
809 | } | |
af31f412 | 810 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
811 | err = -EPERM; |
812 | goto exit_f; | |
813 | } | |
814 | if (opt->dst1opt) { | |
815 | err = -EINVAL; | |
816 | goto exit_f; | |
817 | } | |
818 | opt->opt_flen += len; | |
819 | opt->dst1opt = hdr; | |
820 | break; | |
821 | ||
333fad53 YH |
822 | case IPV6_DSTOPTS: |
823 | case IPV6_RTHDRDSTOPTS: | |
824 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
825 | err = -EINVAL; | |
826 | goto exit_f; | |
827 | } | |
828 | ||
829 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
830 | len = ((hdr->hdrlen + 1) << 3); | |
831 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
832 | err = -EINVAL; | |
833 | goto exit_f; | |
834 | } | |
af31f412 | 835 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
836 | err = -EPERM; |
837 | goto exit_f; | |
838 | } | |
839 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
840 | opt->opt_flen += len; | |
841 | opt->dst1opt = hdr; | |
842 | } else { | |
843 | opt->opt_nflen += len; | |
844 | opt->dst0opt = hdr; | |
845 | } | |
846 | break; | |
847 | ||
848 | case IPV6_2292RTHDR: | |
1da177e4 | 849 | case IPV6_RTHDR: |
1ab1457c | 850 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
851 | err = -EINVAL; |
852 | goto exit_f; | |
853 | } | |
854 | ||
855 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
856 | ||
280a9d34 | 857 | switch (rthdr->type) { |
07a93626 | 858 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 859 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
860 | if (rthdr->hdrlen != 2 || |
861 | rthdr->segments_left != 1) { | |
862 | err = -EINVAL; | |
863 | goto exit_f; | |
864 | } | |
280a9d34 | 865 | break; |
bb4dbf9e | 866 | #endif |
280a9d34 | 867 | default: |
1da177e4 LT |
868 | err = -EINVAL; |
869 | goto exit_f; | |
870 | } | |
871 | ||
872 | len = ((rthdr->hdrlen + 1) << 3); | |
873 | ||
1ab1457c | 874 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
875 | err = -EINVAL; |
876 | goto exit_f; | |
877 | } | |
878 | ||
879 | /* segments left must also match */ | |
880 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
881 | err = -EINVAL; | |
882 | goto exit_f; | |
883 | } | |
884 | ||
885 | opt->opt_nflen += len; | |
886 | opt->srcrt = rthdr; | |
887 | ||
333fad53 | 888 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
889 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
890 | ||
891 | opt->opt_nflen += dsthdrlen; | |
892 | opt->dst0opt = opt->dst1opt; | |
893 | opt->dst1opt = NULL; | |
894 | opt->opt_flen -= dsthdrlen; | |
895 | } | |
896 | ||
897 | break; | |
898 | ||
333fad53 | 899 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
900 | case IPV6_HOPLIMIT: |
901 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
902 | err = -EINVAL; | |
903 | goto exit_f; | |
904 | } | |
905 | ||
906 | *hlimit = *(int *)CMSG_DATA(cmsg); | |
e8766fc8 SW |
907 | if (*hlimit < -1 || *hlimit > 0xff) { |
908 | err = -EINVAL; | |
909 | goto exit_f; | |
910 | } | |
911 | ||
1da177e4 LT |
912 | break; |
913 | ||
41a1f8ea YH |
914 | case IPV6_TCLASS: |
915 | { | |
916 | int tc; | |
917 | ||
918 | err = -EINVAL; | |
b5a4257c | 919 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 920 | goto exit_f; |
41a1f8ea YH |
921 | |
922 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 923 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
924 | goto exit_f; |
925 | ||
926 | err = 0; | |
927 | *tclass = tc; | |
928 | ||
13b52cd4 BH |
929 | break; |
930 | } | |
931 | ||
932 | case IPV6_DONTFRAG: | |
933 | { | |
934 | int df; | |
935 | ||
936 | err = -EINVAL; | |
b5a4257c | 937 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 938 | goto exit_f; |
13b52cd4 BH |
939 | |
940 | df = *(int *)CMSG_DATA(cmsg); | |
941 | if (df < 0 || df > 1) | |
942 | goto exit_f; | |
943 | ||
944 | err = 0; | |
945 | *dontfrag = df; | |
946 | ||
41a1f8ea YH |
947 | break; |
948 | } | |
1da177e4 | 949 | default: |
ba7a46f1 JP |
950 | net_dbg_ratelimited("invalid cmsg type: %d\n", |
951 | cmsg->cmsg_type); | |
1da177e4 | 952 | err = -EINVAL; |
4a36702e | 953 | goto exit_f; |
3ff50b79 | 954 | } |
1da177e4 LT |
955 | } |
956 | ||
957 | exit_f: | |
958 | return err; | |
959 | } | |
73df66f8 | 960 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
17ef66af LC |
961 | |
962 | void ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, | |
963 | __u16 srcp, __u16 destp, int bucket) | |
964 | { | |
17ef66af LC |
965 | const struct in6_addr *dest, *src; |
966 | ||
efe4208f ED |
967 | dest = &sp->sk_v6_daddr; |
968 | src = &sp->sk_v6_rcv_saddr; | |
17ef66af LC |
969 | seq_printf(seq, |
970 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
d14c5ab6 | 971 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %d\n", |
17ef66af LC |
972 | bucket, |
973 | src->s6_addr32[0], src->s6_addr32[1], | |
974 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
975 | dest->s6_addr32[0], dest->s6_addr32[1], | |
976 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
977 | sp->sk_state, | |
978 | sk_wmem_alloc_get(sp), | |
979 | sk_rmem_alloc_get(sp), | |
980 | 0, 0L, 0, | |
981 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), | |
982 | 0, | |
983 | sock_i_ino(sp), | |
984 | atomic_read(&sp->sk_refcnt), sp, | |
985 | atomic_read(&sp->sk_drops)); | |
986 | } |