Commit | Line | Data |
---|---|---|
2874c5fd | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * common UDP/RAW code | |
1ab1457c | 4 | * Linux INET6 implementation |
1da177e4 LT |
5 | * |
6 | * Authors: | |
1ab1457c | 7 | * Pedro Roque <roque@di.fc.ul.pt> |
1da177e4 LT |
8 | */ |
9 | ||
4fc268d2 | 10 | #include <linux/capability.h> |
1da177e4 LT |
11 | #include <linux/errno.h> |
12 | #include <linux/types.h> | |
13 | #include <linux/kernel.h> | |
1da177e4 LT |
14 | #include <linux/interrupt.h> |
15 | #include <linux/socket.h> | |
16 | #include <linux/sockios.h> | |
17 | #include <linux/in6.h> | |
18 | #include <linux/ipv6.h> | |
19 | #include <linux/route.h> | |
5a0e3ad6 | 20 | #include <linux/slab.h> |
a495f836 | 21 | #include <linux/export.h> |
01370434 | 22 | #include <linux/icmp.h> |
1da177e4 LT |
23 | |
24 | #include <net/ipv6.h> | |
25 | #include <net/ndisc.h> | |
26 | #include <net/addrconf.h> | |
27 | #include <net/transp_v6.h> | |
28 | #include <net/ip6_route.h> | |
c752f073 | 29 | #include <net/tcp_states.h> |
e7219858 | 30 | #include <net/dsfield.h> |
acdcecc6 | 31 | #include <net/sock_reuseport.h> |
1da177e4 LT |
32 | |
33 | #include <linux/errqueue.h> | |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
1da177e4 | 35 | |
a50feda5 | 36 | static bool ipv6_mapped_addr_any(const struct in6_addr *a) |
c15fea2d | 37 | { |
a50feda5 | 38 | return ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0); |
c15fea2d MM |
39 | } |
40 | ||
80fbdb20 MKL |
41 | static void ip6_datagram_flow_key_init(struct flowi6 *fl6, struct sock *sk) |
42 | { | |
43 | struct inet_sock *inet = inet_sk(sk); | |
44 | struct ipv6_pinfo *np = inet6_sk(sk); | |
45 | ||
46 | memset(fl6, 0, sizeof(*fl6)); | |
47 | fl6->flowi6_proto = sk->sk_protocol; | |
48 | fl6->daddr = sk->sk_v6_daddr; | |
49 | fl6->saddr = np->saddr; | |
50 | fl6->flowi6_oif = sk->sk_bound_dev_if; | |
51 | fl6->flowi6_mark = sk->sk_mark; | |
52 | fl6->fl6_dport = inet->inet_dport; | |
53 | fl6->fl6_sport = inet->inet_sport; | |
54 | fl6->flowlabel = np->flow_label; | |
e2d118a1 | 55 | fl6->flowi6_uid = sk->sk_uid; |
80fbdb20 MKL |
56 | |
57 | if (!fl6->flowi6_oif) | |
58 | fl6->flowi6_oif = np->sticky_pktinfo.ipi6_ifindex; | |
59 | ||
60 | if (!fl6->flowi6_oif && ipv6_addr_is_multicast(&fl6->daddr)) | |
61 | fl6->flowi6_oif = np->mcast_oif; | |
62 | ||
3df98d79 | 63 | security_sk_classify_flow(sk, flowi6_to_flowi_common(fl6)); |
80fbdb20 MKL |
64 | } |
65 | ||
33c162a9 | 66 | int ip6_datagram_dst_update(struct sock *sk, bool fix_sk_saddr) |
7e2040db MKL |
67 | { |
68 | struct ip6_flowlabel *flowlabel = NULL; | |
69 | struct in6_addr *final_p, final; | |
70 | struct ipv6_txoptions *opt; | |
71 | struct dst_entry *dst; | |
72 | struct inet_sock *inet = inet_sk(sk); | |
73 | struct ipv6_pinfo *np = inet6_sk(sk); | |
74 | struct flowi6 fl6; | |
75 | int err = 0; | |
76 | ||
77 | if (np->sndflow && (np->flow_label & IPV6_FLOWLABEL_MASK)) { | |
78 | flowlabel = fl6_sock_lookup(sk, np->flow_label); | |
8975a3ab | 79 | if (IS_ERR(flowlabel)) |
7e2040db MKL |
80 | return -EINVAL; |
81 | } | |
82 | ip6_datagram_flow_key_init(&fl6, sk); | |
83 | ||
84 | rcu_read_lock(); | |
85 | opt = flowlabel ? flowlabel->opt : rcu_dereference(np->opt); | |
86 | final_p = fl6_update_dst(&fl6, opt, &final); | |
87 | rcu_read_unlock(); | |
88 | ||
c4e85f73 | 89 | dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p); |
7e2040db MKL |
90 | if (IS_ERR(dst)) { |
91 | err = PTR_ERR(dst); | |
92 | goto out; | |
93 | } | |
94 | ||
33c162a9 MKL |
95 | if (fix_sk_saddr) { |
96 | if (ipv6_addr_any(&np->saddr)) | |
97 | np->saddr = fl6.saddr; | |
7e2040db | 98 | |
33c162a9 MKL |
99 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr)) { |
100 | sk->sk_v6_rcv_saddr = fl6.saddr; | |
101 | inet->inet_rcv_saddr = LOOPBACK4_IPV6; | |
102 | if (sk->sk_prot->rehash) | |
103 | sk->sk_prot->rehash(sk); | |
104 | } | |
7e2040db MKL |
105 | } |
106 | ||
7d6850f7 | 107 | ip6_sk_dst_store_flow(sk, dst, &fl6); |
7e2040db MKL |
108 | |
109 | out: | |
110 | fl6_sock_release(flowlabel); | |
111 | return err; | |
112 | } | |
113 | ||
e646b657 MKL |
114 | void ip6_datagram_release_cb(struct sock *sk) |
115 | { | |
116 | struct dst_entry *dst; | |
117 | ||
118 | if (ipv6_addr_v4mapped(&sk->sk_v6_daddr)) | |
119 | return; | |
120 | ||
121 | rcu_read_lock(); | |
122 | dst = __sk_dst_get(sk); | |
123 | if (!dst || !dst->obsolete || | |
124 | dst->ops->check(dst, inet6_sk(sk)->dst_cookie)) { | |
125 | rcu_read_unlock(); | |
126 | return; | |
127 | } | |
128 | rcu_read_unlock(); | |
129 | ||
130 | ip6_datagram_dst_update(sk, false); | |
131 | } | |
132 | EXPORT_SYMBOL_GPL(ip6_datagram_release_cb); | |
133 | ||
0382a25a GN |
134 | int __ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, |
135 | int addr_len) | |
1da177e4 LT |
136 | { |
137 | struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr; | |
67ba4152 IM |
138 | struct inet_sock *inet = inet_sk(sk); |
139 | struct ipv6_pinfo *np = inet6_sk(sk); | |
2f987a76 PA |
140 | struct in6_addr *daddr, old_daddr; |
141 | __be32 fl6_flowlabel = 0; | |
142 | __be32 old_fl6_flowlabel; | |
5f2fb802 | 143 | __be16 old_dport; |
1da177e4 LT |
144 | int addr_type; |
145 | int err; | |
146 | ||
147 | if (usin->sin6_family == AF_INET) { | |
89e9c728 | 148 | if (ipv6_only_sock(sk)) |
1da177e4 | 149 | return -EAFNOSUPPORT; |
03645a11 | 150 | err = __ip4_datagram_connect(sk, uaddr, addr_len); |
1da177e4 LT |
151 | goto ipv4_connected; |
152 | } | |
153 | ||
154 | if (addr_len < SIN6_LEN_RFC2133) | |
1ab1457c | 155 | return -EINVAL; |
1da177e4 | 156 | |
1ab1457c YH |
157 | if (usin->sin6_family != AF_INET6) |
158 | return -EAFNOSUPPORT; | |
1da177e4 | 159 | |
7e2040db | 160 | if (np->sndflow) |
80fbdb20 | 161 | fl6_flowlabel = usin->sin6_flowinfo & IPV6_FLOWINFO_MASK; |
1da177e4 | 162 | |
052d2369 | 163 | if (ipv6_addr_any(&usin->sin6_addr)) { |
1da177e4 LT |
164 | /* |
165 | * connect to self | |
166 | */ | |
052d2369 JL |
167 | if (ipv6_addr_v4mapped(&sk->sk_v6_rcv_saddr)) |
168 | ipv6_addr_set_v4mapped(htonl(INADDR_LOOPBACK), | |
169 | &usin->sin6_addr); | |
170 | else | |
171 | usin->sin6_addr = in6addr_loopback; | |
1da177e4 LT |
172 | } |
173 | ||
052d2369 JL |
174 | addr_type = ipv6_addr_type(&usin->sin6_addr); |
175 | ||
1da177e4 LT |
176 | daddr = &usin->sin6_addr; |
177 | ||
052d2369 | 178 | if (addr_type & IPV6_ADDR_MAPPED) { |
1da177e4 LT |
179 | struct sockaddr_in sin; |
180 | ||
89e9c728 | 181 | if (ipv6_only_sock(sk)) { |
1da177e4 LT |
182 | err = -ENETUNREACH; |
183 | goto out; | |
184 | } | |
185 | sin.sin_family = AF_INET; | |
186 | sin.sin_addr.s_addr = daddr->s6_addr32[3]; | |
187 | sin.sin_port = usin->sin6_port; | |
188 | ||
03645a11 ED |
189 | err = __ip4_datagram_connect(sk, |
190 | (struct sockaddr *) &sin, | |
191 | sizeof(sin)); | |
1da177e4 LT |
192 | |
193 | ipv4_connected: | |
194 | if (err) | |
195 | goto out; | |
1ab1457c | 196 | |
efe4208f | 197 | ipv6_addr_set_v4mapped(inet->inet_daddr, &sk->sk_v6_daddr); |
1da177e4 | 198 | |
c15fea2d MM |
199 | if (ipv6_addr_any(&np->saddr) || |
200 | ipv6_mapped_addr_any(&np->saddr)) | |
c720c7e8 | 201 | ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr); |
b301e82c | 202 | |
efe4208f ED |
203 | if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) || |
204 | ipv6_mapped_addr_any(&sk->sk_v6_rcv_saddr)) { | |
c720c7e8 | 205 | ipv6_addr_set_v4mapped(inet->inet_rcv_saddr, |
efe4208f | 206 | &sk->sk_v6_rcv_saddr); |
719f8358 ED |
207 | if (sk->sk_prot->rehash) |
208 | sk->sk_prot->rehash(sk); | |
209 | } | |
1da177e4 | 210 | |
1da177e4 LT |
211 | goto out; |
212 | } | |
213 | ||
842df073 | 214 | if (__ipv6_addr_needs_scope_id(addr_type)) { |
1da177e4 LT |
215 | if (addr_len >= sizeof(struct sockaddr_in6) && |
216 | usin->sin6_scope_id) { | |
54dc3e33 | 217 | if (!sk_dev_equal_l3scope(sk, usin->sin6_scope_id)) { |
1da177e4 LT |
218 | err = -EINVAL; |
219 | goto out; | |
220 | } | |
4c971d2f | 221 | WRITE_ONCE(sk->sk_bound_dev_if, usin->sin6_scope_id); |
1da177e4 LT |
222 | } |
223 | ||
1ac4f008 | 224 | if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST)) |
4c971d2f | 225 | WRITE_ONCE(sk->sk_bound_dev_if, np->mcast_oif); |
1ac4f008 | 226 | |
1da177e4 LT |
227 | /* Connect to link-local address requires an interface */ |
228 | if (!sk->sk_bound_dev_if) { | |
229 | err = -EINVAL; | |
230 | goto out; | |
231 | } | |
232 | } | |
233 | ||
2f987a76 PA |
234 | /* save the current peer information before updating it */ |
235 | old_daddr = sk->sk_v6_daddr; | |
236 | old_fl6_flowlabel = np->flow_label; | |
237 | old_dport = inet->inet_dport; | |
238 | ||
efe4208f | 239 | sk->sk_v6_daddr = *daddr; |
80fbdb20 | 240 | np->flow_label = fl6_flowlabel; |
c720c7e8 | 241 | inet->inet_dport = usin->sin6_port; |
1da177e4 LT |
242 | |
243 | /* | |
244 | * Check for a route to destination an obtain the | |
245 | * destination cache for it. | |
246 | */ | |
247 | ||
33c162a9 | 248 | err = ip6_datagram_dst_update(sk, true); |
85cb73ff | 249 | if (err) { |
2f987a76 PA |
250 | /* Restore the socket peer info, to keep it consistent with |
251 | * the old socket state | |
85cb73ff | 252 | */ |
2f987a76 PA |
253 | sk->sk_v6_daddr = old_daddr; |
254 | np->flow_label = old_fl6_flowlabel; | |
255 | inet->inet_dport = old_dport; | |
1da177e4 | 256 | goto out; |
85cb73ff | 257 | } |
1da177e4 | 258 | |
69421bf9 | 259 | reuseport_has_conns_set(sk); |
1da177e4 | 260 | sk->sk_state = TCP_ESTABLISHED; |
877d1f62 | 261 | sk_set_txhash(sk); |
1da177e4 | 262 | out: |
1da177e4 LT |
263 | return err; |
264 | } | |
0382a25a | 265 | EXPORT_SYMBOL_GPL(__ip6_datagram_connect); |
03645a11 ED |
266 | |
267 | int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len) | |
268 | { | |
269 | int res; | |
270 | ||
271 | lock_sock(sk); | |
272 | res = __ip6_datagram_connect(sk, uaddr, addr_len); | |
273 | release_sock(sk); | |
274 | return res; | |
275 | } | |
a495f836 | 276 | EXPORT_SYMBOL_GPL(ip6_datagram_connect); |
1da177e4 | 277 | |
82b276cd HFS |
278 | int ip6_datagram_connect_v6_only(struct sock *sk, struct sockaddr *uaddr, |
279 | int addr_len) | |
280 | { | |
281 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, uaddr); | |
282 | if (sin6->sin6_family != AF_INET6) | |
283 | return -EAFNOSUPPORT; | |
284 | return ip6_datagram_connect(sk, uaddr, addr_len); | |
285 | } | |
286 | EXPORT_SYMBOL_GPL(ip6_datagram_connect_v6_only); | |
287 | ||
01370434 WB |
288 | static void ipv6_icmp_error_rfc4884(const struct sk_buff *skb, |
289 | struct sock_ee_data_rfc4884 *out) | |
290 | { | |
291 | switch (icmp6_hdr(skb)->icmp6_type) { | |
292 | case ICMPV6_TIME_EXCEED: | |
293 | case ICMPV6_DEST_UNREACH: | |
294 | ip_icmp_error_rfc4884(skb, out, sizeof(struct icmp6hdr), | |
295 | icmp6_hdr(skb)->icmp6_datagram_len * 8); | |
296 | } | |
297 | } | |
298 | ||
1ab1457c | 299 | void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err, |
e69a4adc | 300 | __be16 port, u32 info, u8 *payload) |
1da177e4 LT |
301 | { |
302 | struct ipv6_pinfo *np = inet6_sk(sk); | |
cc70ab26 | 303 | struct icmp6hdr *icmph = icmp6_hdr(skb); |
1da177e4 LT |
304 | struct sock_exterr_skb *serr; |
305 | ||
306 | if (!np->recverr) | |
307 | return; | |
308 | ||
309 | skb = skb_clone(skb, GFP_ATOMIC); | |
310 | if (!skb) | |
311 | return; | |
312 | ||
d40a4de0 BH |
313 | skb->protocol = htons(ETH_P_IPV6); |
314 | ||
1da177e4 LT |
315 | serr = SKB_EXT_ERR(skb); |
316 | serr->ee.ee_errno = err; | |
317 | serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6; | |
1ab1457c | 318 | serr->ee.ee_type = icmph->icmp6_type; |
1da177e4 LT |
319 | serr->ee.ee_code = icmph->icmp6_code; |
320 | serr->ee.ee_pad = 0; | |
321 | serr->ee.ee_info = info; | |
322 | serr->ee.ee_data = 0; | |
d56f90a7 ACM |
323 | serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) - |
324 | skb_network_header(skb); | |
1da177e4 LT |
325 | serr->port = port; |
326 | ||
1da177e4 | 327 | __skb_pull(skb, payload - skb->data); |
01370434 WB |
328 | |
329 | if (inet6_sk(sk)->recverr_rfc4884) | |
330 | ipv6_icmp_error_rfc4884(skb, &serr->ee.ee_rfc4884); | |
331 | ||
bd82393c | 332 | skb_reset_transport_header(skb); |
1da177e4 LT |
333 | |
334 | if (sock_queue_err_skb(sk, skb)) | |
335 | kfree_skb(skb); | |
336 | } | |
337 | ||
4c9483b2 | 338 | void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info) |
1da177e4 | 339 | { |
1c1e9d2b | 340 | const struct ipv6_pinfo *np = inet6_sk(sk); |
1da177e4 LT |
341 | struct sock_exterr_skb *serr; |
342 | struct ipv6hdr *iph; | |
343 | struct sk_buff *skb; | |
344 | ||
345 | if (!np->recverr) | |
346 | return; | |
347 | ||
348 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
349 | if (!skb) | |
350 | return; | |
351 | ||
d40a4de0 BH |
352 | skb->protocol = htons(ETH_P_IPV6); |
353 | ||
1ced98e8 ACM |
354 | skb_put(skb, sizeof(struct ipv6hdr)); |
355 | skb_reset_network_header(skb); | |
0660e03f | 356 | iph = ipv6_hdr(skb); |
4e3fd7a0 | 357 | iph->daddr = fl6->daddr; |
7d033c9f | 358 | ip6_flow_hdr(iph, 0, 0); |
1da177e4 LT |
359 | |
360 | serr = SKB_EXT_ERR(skb); | |
361 | serr->ee.ee_errno = err; | |
362 | serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL; | |
1ab1457c | 363 | serr->ee.ee_type = 0; |
1da177e4 LT |
364 | serr->ee.ee_code = 0; |
365 | serr->ee.ee_pad = 0; | |
366 | serr->ee.ee_info = info; | |
367 | serr->ee.ee_data = 0; | |
d56f90a7 | 368 | serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb); |
1958b856 | 369 | serr->port = fl6->fl6_dport; |
1da177e4 | 370 | |
27a884dc | 371 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); |
bd82393c | 372 | skb_reset_transport_header(skb); |
1da177e4 LT |
373 | |
374 | if (sock_queue_err_skb(sk, skb)) | |
375 | kfree_skb(skb); | |
376 | } | |
377 | ||
4c9483b2 | 378 | void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu) |
4b340ae2 BH |
379 | { |
380 | struct ipv6_pinfo *np = inet6_sk(sk); | |
381 | struct ipv6hdr *iph; | |
382 | struct sk_buff *skb; | |
383 | struct ip6_mtuinfo *mtu_info; | |
384 | ||
385 | if (!np->rxopt.bits.rxpmtu) | |
386 | return; | |
387 | ||
388 | skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC); | |
389 | if (!skb) | |
390 | return; | |
391 | ||
392 | skb_put(skb, sizeof(struct ipv6hdr)); | |
393 | skb_reset_network_header(skb); | |
394 | iph = ipv6_hdr(skb); | |
4e3fd7a0 | 395 | iph->daddr = fl6->daddr; |
4b340ae2 BH |
396 | |
397 | mtu_info = IP6CBMTU(skb); | |
4b340ae2 BH |
398 | |
399 | mtu_info->ip6m_mtu = mtu; | |
400 | mtu_info->ip6m_addr.sin6_family = AF_INET6; | |
401 | mtu_info->ip6m_addr.sin6_port = 0; | |
402 | mtu_info->ip6m_addr.sin6_flowinfo = 0; | |
4c9483b2 | 403 | mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif; |
4e3fd7a0 | 404 | mtu_info->ip6m_addr.sin6_addr = ipv6_hdr(skb)->daddr; |
4b340ae2 BH |
405 | |
406 | __skb_pull(skb, skb_tail_pointer(skb) - skb->data); | |
407 | skb_reset_transport_header(skb); | |
408 | ||
409 | skb = xchg(&np->rxpmtu, skb); | |
410 | kfree_skb(skb); | |
411 | } | |
412 | ||
34b99df4 JA |
413 | /* For some errors we have valid addr_offset even with zero payload and |
414 | * zero port. Also, addr_offset should be supported if port is set. | |
415 | */ | |
416 | static inline bool ipv6_datagram_support_addr(struct sock_exterr_skb *serr) | |
417 | { | |
418 | return serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6 || | |
419 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || | |
420 | serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL || serr->port; | |
421 | } | |
422 | ||
c247f053 WB |
423 | /* IPv6 supports cmsg on all origins aside from SO_EE_ORIGIN_LOCAL. |
424 | * | |
425 | * At one point, excluding local errors was a quick test to identify icmp/icmp6 | |
426 | * errors. This is no longer true, but the test remained, so the v6 stack, | |
427 | * unlike v4, also honors cmsg requests on all wifi and timestamp errors. | |
c247f053 WB |
428 | */ |
429 | static bool ip6_datagram_support_cmsg(struct sk_buff *skb, | |
430 | struct sock_exterr_skb *serr) | |
829ae9d6 | 431 | { |
c247f053 WB |
432 | if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP || |
433 | serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) | |
434 | return true; | |
435 | ||
436 | if (serr->ee.ee_origin == SO_EE_ORIGIN_LOCAL) | |
437 | return false; | |
438 | ||
1862d620 | 439 | if (!IP6CB(skb)->iif) |
c247f053 | 440 | return false; |
829ae9d6 | 441 | |
c247f053 | 442 | return true; |
829ae9d6 WB |
443 | } |
444 | ||
1ab1457c | 445 | /* |
1da177e4 LT |
446 | * Handle MSG_ERRQUEUE |
447 | */ | |
85fbaa75 | 448 | int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len, int *addr_len) |
1da177e4 LT |
449 | { |
450 | struct ipv6_pinfo *np = inet6_sk(sk); | |
451 | struct sock_exterr_skb *serr; | |
364a9e93 | 452 | struct sk_buff *skb; |
342dfc30 | 453 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
1da177e4 LT |
454 | struct { |
455 | struct sock_extended_err ee; | |
456 | struct sockaddr_in6 offender; | |
457 | } errhdr; | |
458 | int err; | |
459 | int copied; | |
460 | ||
461 | err = -EAGAIN; | |
364a9e93 | 462 | skb = sock_dequeue_err_skb(sk); |
63159f29 | 463 | if (!skb) |
1da177e4 LT |
464 | goto out; |
465 | ||
466 | copied = skb->len; | |
467 | if (copied > len) { | |
468 | msg->msg_flags |= MSG_TRUNC; | |
469 | copied = len; | |
470 | } | |
51f3d02b | 471 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
960a2628 ED |
472 | if (unlikely(err)) { |
473 | kfree_skb(skb); | |
474 | return err; | |
475 | } | |
1da177e4 LT |
476 | sock_recv_timestamp(msg, sk, skb); |
477 | ||
478 | serr = SKB_EXT_ERR(skb); | |
479 | ||
34b99df4 | 480 | if (sin && ipv6_datagram_support_addr(serr)) { |
d56f90a7 | 481 | const unsigned char *nh = skb_network_header(skb); |
1da177e4 LT |
482 | sin->sin6_family = AF_INET6; |
483 | sin->sin6_flowinfo = 0; | |
1ab1457c | 484 | sin->sin6_port = serr->port; |
d40a4de0 | 485 | if (skb->protocol == htons(ETH_P_IPV6)) { |
6c40d100 YH |
486 | const struct ipv6hdr *ip6h = container_of((struct in6_addr *)(nh + serr->addr_offset), |
487 | struct ipv6hdr, daddr); | |
488 | sin->sin6_addr = ip6h->daddr; | |
1da177e4 | 489 | if (np->sndflow) |
6502ca52 | 490 | sin->sin6_flowinfo = ip6_flowinfo(ip6h); |
842df073 HFS |
491 | sin->sin6_scope_id = |
492 | ipv6_iface_scope_id(&sin->sin6_addr, | |
493 | IP6CB(skb)->iif); | |
1da177e4 | 494 | } else { |
b301e82c BH |
495 | ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset), |
496 | &sin->sin6_addr); | |
842df073 | 497 | sin->sin6_scope_id = 0; |
1da177e4 | 498 | } |
85fbaa75 | 499 | *addr_len = sizeof(*sin); |
1da177e4 LT |
500 | } |
501 | ||
502 | memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err)); | |
503 | sin = &errhdr.offender; | |
f812116b | 504 | memset(sin, 0, sizeof(*sin)); |
c247f053 WB |
505 | |
506 | if (ip6_datagram_support_cmsg(skb, serr)) { | |
1da177e4 | 507 | sin->sin6_family = AF_INET6; |
c247f053 | 508 | if (np->rxopt.all) |
4b261c75 | 509 | ip6_datagram_recv_common_ctl(sk, msg, skb); |
d40a4de0 | 510 | if (skb->protocol == htons(ETH_P_IPV6)) { |
4e3fd7a0 | 511 | sin->sin6_addr = ipv6_hdr(skb)->saddr; |
1da177e4 | 512 | if (np->rxopt.all) |
4b261c75 | 513 | ip6_datagram_recv_specific_ctl(sk, msg, skb); |
842df073 HFS |
514 | sin->sin6_scope_id = |
515 | ipv6_iface_scope_id(&sin->sin6_addr, | |
516 | IP6CB(skb)->iif); | |
1da177e4 | 517 | } else { |
b301e82c BH |
518 | ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr, |
519 | &sin->sin6_addr); | |
f812116b | 520 | if (inet_sk(sk)->cmsg_flags) |
1da177e4 LT |
521 | ip_cmsg_recv(msg, skb); |
522 | } | |
523 | } | |
524 | ||
525 | put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr); | |
526 | ||
527 | /* Now we could try to dump offended packet options */ | |
528 | ||
529 | msg->msg_flags |= MSG_ERRQUEUE; | |
530 | err = copied; | |
531 | ||
960a2628 | 532 | consume_skb(skb); |
1da177e4 LT |
533 | out: |
534 | return err; | |
535 | } | |
a495f836 | 536 | EXPORT_SYMBOL_GPL(ipv6_recv_error); |
1da177e4 | 537 | |
4b340ae2 BH |
538 | /* |
539 | * Handle IPV6_RECVPATHMTU | |
540 | */ | |
85fbaa75 HFS |
541 | int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len, |
542 | int *addr_len) | |
4b340ae2 BH |
543 | { |
544 | struct ipv6_pinfo *np = inet6_sk(sk); | |
545 | struct sk_buff *skb; | |
4b340ae2 | 546 | struct ip6_mtuinfo mtu_info; |
342dfc30 | 547 | DECLARE_SOCKADDR(struct sockaddr_in6 *, sin, msg->msg_name); |
4b340ae2 BH |
548 | int err; |
549 | int copied; | |
550 | ||
551 | err = -EAGAIN; | |
552 | skb = xchg(&np->rxpmtu, NULL); | |
63159f29 | 553 | if (!skb) |
4b340ae2 BH |
554 | goto out; |
555 | ||
556 | copied = skb->len; | |
557 | if (copied > len) { | |
558 | msg->msg_flags |= MSG_TRUNC; | |
559 | copied = len; | |
560 | } | |
51f3d02b | 561 | err = skb_copy_datagram_msg(skb, 0, msg, copied); |
4b340ae2 BH |
562 | if (err) |
563 | goto out_free_skb; | |
564 | ||
565 | sock_recv_timestamp(msg, sk, skb); | |
566 | ||
567 | memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info)); | |
568 | ||
4b340ae2 BH |
569 | if (sin) { |
570 | sin->sin6_family = AF_INET6; | |
571 | sin->sin6_flowinfo = 0; | |
572 | sin->sin6_port = 0; | |
573 | sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id; | |
4e3fd7a0 | 574 | sin->sin6_addr = mtu_info.ip6m_addr.sin6_addr; |
85fbaa75 | 575 | *addr_len = sizeof(*sin); |
4b340ae2 BH |
576 | } |
577 | ||
578 | put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info); | |
579 | ||
580 | err = copied; | |
581 | ||
582 | out_free_skb: | |
583 | kfree_skb(skb); | |
584 | out: | |
585 | return err; | |
586 | } | |
1da177e4 LT |
587 | |
588 | ||
4b261c75 HFS |
589 | void ip6_datagram_recv_common_ctl(struct sock *sk, struct msghdr *msg, |
590 | struct sk_buff *skb) | |
1da177e4 LT |
591 | { |
592 | struct ipv6_pinfo *np = inet6_sk(sk); | |
4b261c75 | 593 | bool is_ipv6 = skb->protocol == htons(ETH_P_IPV6); |
1da177e4 LT |
594 | |
595 | if (np->rxopt.bits.rxinfo) { | |
596 | struct in6_pktinfo src_info; | |
597 | ||
4b261c75 HFS |
598 | if (is_ipv6) { |
599 | src_info.ipi6_ifindex = IP6CB(skb)->iif; | |
600 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; | |
601 | } else { | |
602 | src_info.ipi6_ifindex = | |
603 | PKTINFO_SKB_CB(skb)->ipi_ifindex; | |
604 | ipv6_addr_set_v4mapped(ip_hdr(skb)->daddr, | |
605 | &src_info.ipi6_addr); | |
606 | } | |
829ae9d6 WB |
607 | |
608 | if (src_info.ipi6_ifindex >= 0) | |
609 | put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, | |
610 | sizeof(src_info), &src_info); | |
1da177e4 | 611 | } |
4b261c75 HFS |
612 | } |
613 | ||
614 | void ip6_datagram_recv_specific_ctl(struct sock *sk, struct msghdr *msg, | |
615 | struct sk_buff *skb) | |
616 | { | |
617 | struct ipv6_pinfo *np = inet6_sk(sk); | |
618 | struct inet6_skb_parm *opt = IP6CB(skb); | |
619 | unsigned char *nh = skb_network_header(skb); | |
1da177e4 LT |
620 | |
621 | if (np->rxopt.bits.rxhlim) { | |
0660e03f | 622 | int hlim = ipv6_hdr(skb)->hop_limit; |
1da177e4 LT |
623 | put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim); |
624 | } | |
625 | ||
41a1f8ea | 626 | if (np->rxopt.bits.rxtclass) { |
e7219858 | 627 | int tclass = ipv6_get_dsfield(ipv6_hdr(skb)); |
41a1f8ea YH |
628 | put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass); |
629 | } | |
630 | ||
6502ca52 YH |
631 | if (np->rxopt.bits.rxflow) { |
632 | __be32 flowinfo = ip6_flowinfo((struct ipv6hdr *)nh); | |
633 | if (flowinfo) | |
634 | put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo); | |
1da177e4 | 635 | } |
333fad53 YH |
636 | |
637 | /* HbH is allowed only once */ | |
8b58a398 FW |
638 | if (np->rxopt.bits.hopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
639 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
1da177e4 LT |
640 | put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr); |
641 | } | |
333fad53 YH |
642 | |
643 | if (opt->lastopt && | |
644 | (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) { | |
645 | /* | |
646 | * Silly enough, but we need to reparse in order to | |
647 | * report extension headers (except for HbH) | |
648 | * in order. | |
649 | * | |
1ab1457c | 650 | * Also note that IPV6_RECVRTHDRDSTOPTS is NOT |
333fad53 YH |
651 | * (and WILL NOT be) defined because |
652 | * IPV6_RECVDSTOPTS is more generic. --yoshfuji | |
653 | */ | |
654 | unsigned int off = sizeof(struct ipv6hdr); | |
0660e03f | 655 | u8 nexthdr = ipv6_hdr(skb)->nexthdr; |
333fad53 YH |
656 | |
657 | while (off <= opt->lastopt) { | |
95c96174 | 658 | unsigned int len; |
d56f90a7 | 659 | u8 *ptr = nh + off; |
333fad53 | 660 | |
b5a4257c | 661 | switch (nexthdr) { |
333fad53 YH |
662 | case IPPROTO_DSTOPTS: |
663 | nexthdr = ptr[0]; | |
664 | len = (ptr[1] + 1) << 3; | |
665 | if (np->rxopt.bits.dstopts) | |
666 | put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr); | |
667 | break; | |
668 | case IPPROTO_ROUTING: | |
669 | nexthdr = ptr[0]; | |
670 | len = (ptr[1] + 1) << 3; | |
671 | if (np->rxopt.bits.srcrt) | |
672 | put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr); | |
673 | break; | |
674 | case IPPROTO_AH: | |
675 | nexthdr = ptr[0]; | |
a3059893 | 676 | len = (ptr[1] + 2) << 2; |
333fad53 YH |
677 | break; |
678 | default: | |
679 | nexthdr = ptr[0]; | |
680 | len = (ptr[1] + 1) << 3; | |
681 | break; | |
682 | } | |
683 | ||
684 | off += len; | |
685 | } | |
686 | } | |
687 | ||
688 | /* socket options in old style */ | |
689 | if (np->rxopt.bits.rxoinfo) { | |
690 | struct in6_pktinfo src_info; | |
691 | ||
692 | src_info.ipi6_ifindex = opt->iif; | |
4e3fd7a0 | 693 | src_info.ipi6_addr = ipv6_hdr(skb)->daddr; |
333fad53 YH |
694 | put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info); |
695 | } | |
696 | if (np->rxopt.bits.rxohlim) { | |
0660e03f | 697 | int hlim = ipv6_hdr(skb)->hop_limit; |
333fad53 YH |
698 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim); |
699 | } | |
8b58a398 FW |
700 | if (np->rxopt.bits.ohopopts && (opt->flags & IP6SKB_HOPBYHOP)) { |
701 | u8 *ptr = nh + sizeof(struct ipv6hdr); | |
333fad53 YH |
702 | put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr); |
703 | } | |
704 | if (np->rxopt.bits.odstopts && opt->dst0) { | |
d56f90a7 | 705 | u8 *ptr = nh + opt->dst0; |
333fad53 | 706 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 707 | } |
333fad53 | 708 | if (np->rxopt.bits.osrcrt && opt->srcrt) { |
d56f90a7 | 709 | struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt); |
333fad53 | 710 | put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr); |
1da177e4 | 711 | } |
333fad53 | 712 | if (np->rxopt.bits.odstopts && opt->dst1) { |
d56f90a7 | 713 | u8 *ptr = nh + opt->dst1; |
333fad53 | 714 | put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr); |
1da177e4 | 715 | } |
6c468622 BS |
716 | if (np->rxopt.bits.rxorigdstaddr) { |
717 | struct sockaddr_in6 sin6; | |
4a06fa67 | 718 | __be16 _ports[2], *ports; |
6c468622 | 719 | |
4a06fa67 WB |
720 | ports = skb_header_pointer(skb, skb_transport_offset(skb), |
721 | sizeof(_ports), &_ports); | |
722 | if (ports) { | |
6c468622 BS |
723 | /* All current transport protocols have the port numbers in the |
724 | * first four bytes of the transport header and this function is | |
725 | * written with this assumption in mind. | |
726 | */ | |
6c468622 | 727 | sin6.sin6_family = AF_INET6; |
4e3fd7a0 | 728 | sin6.sin6_addr = ipv6_hdr(skb)->daddr; |
6c468622 BS |
729 | sin6.sin6_port = ports[1]; |
730 | sin6.sin6_flowinfo = 0; | |
3868b7aa HFS |
731 | sin6.sin6_scope_id = |
732 | ipv6_iface_scope_id(&ipv6_hdr(skb)->daddr, | |
733 | opt->iif); | |
6c468622 BS |
734 | |
735 | put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6); | |
736 | } | |
737 | } | |
0cc0aa61 WB |
738 | if (np->rxopt.bits.recvfragsize && opt->frag_max_size) { |
739 | int val = opt->frag_max_size; | |
740 | ||
741 | put_cmsg(msg, SOL_IPV6, IPV6_RECVFRAGSIZE, sizeof(val), &val); | |
742 | } | |
4b261c75 HFS |
743 | } |
744 | ||
745 | void ip6_datagram_recv_ctl(struct sock *sk, struct msghdr *msg, | |
746 | struct sk_buff *skb) | |
747 | { | |
748 | ip6_datagram_recv_common_ctl(sk, msg, skb); | |
749 | ip6_datagram_recv_specific_ctl(sk, msg, skb); | |
1da177e4 | 750 | } |
8e72d37e | 751 | EXPORT_SYMBOL_GPL(ip6_datagram_recv_ctl); |
1da177e4 | 752 | |
73df66f8 TP |
753 | int ip6_datagram_send_ctl(struct net *net, struct sock *sk, |
754 | struct msghdr *msg, struct flowi6 *fl6, | |
5fdaa88d | 755 | struct ipcm6_cookie *ipc6) |
1da177e4 LT |
756 | { |
757 | struct in6_pktinfo *src_info; | |
758 | struct cmsghdr *cmsg; | |
759 | struct ipv6_rt_hdr *rthdr; | |
760 | struct ipv6_opt_hdr *hdr; | |
26879da5 | 761 | struct ipv6_txoptions *opt = ipc6->opt; |
1da177e4 LT |
762 | int len; |
763 | int err = 0; | |
764 | ||
f95b414e | 765 | for_each_cmsghdr(cmsg, msg) { |
1da177e4 | 766 | int addr_type; |
1da177e4 LT |
767 | |
768 | if (!CMSG_OK(msg, cmsg)) { | |
769 | err = -EINVAL; | |
770 | goto exit_f; | |
771 | } | |
772 | ||
ad1e46a8 | 773 | if (cmsg->cmsg_level == SOL_SOCKET) { |
5fdaa88d | 774 | err = __sock_cmsg_send(sk, msg, cmsg, &ipc6->sockc); |
2632616b ED |
775 | if (err) |
776 | return err; | |
ad1e46a8 SHY |
777 | continue; |
778 | } | |
779 | ||
1da177e4 LT |
780 | if (cmsg->cmsg_level != SOL_IPV6) |
781 | continue; | |
782 | ||
783 | switch (cmsg->cmsg_type) { | |
1ab1457c YH |
784 | case IPV6_PKTINFO: |
785 | case IPV6_2292PKTINFO: | |
187e3838 YH |
786 | { |
787 | struct net_device *dev = NULL; | |
6da5b0f0 | 788 | int src_idx; |
187e3838 | 789 | |
1ab1457c | 790 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) { |
1da177e4 LT |
791 | err = -EINVAL; |
792 | goto exit_f; | |
793 | } | |
794 | ||
795 | src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg); | |
6da5b0f0 | 796 | src_idx = src_info->ipi6_ifindex; |
1ab1457c | 797 | |
6da5b0f0 | 798 | if (src_idx) { |
4c9483b2 | 799 | if (fl6->flowi6_oif && |
6da5b0f0 | 800 | src_idx != fl6->flowi6_oif && |
4c971d2f | 801 | (READ_ONCE(sk->sk_bound_dev_if) != fl6->flowi6_oif || |
6da5b0f0 | 802 | !sk_dev_equal_l3scope(sk, src_idx))) |
1da177e4 | 803 | return -EINVAL; |
6da5b0f0 | 804 | fl6->flowi6_oif = src_idx; |
1da177e4 LT |
805 | } |
806 | ||
187e3838 | 807 | addr_type = __ipv6_addr_type(&src_info->ipi6_addr); |
1da177e4 | 808 | |
536b2e92 | 809 | rcu_read_lock(); |
4c9483b2 DM |
810 | if (fl6->flowi6_oif) { |
811 | dev = dev_get_by_index_rcu(net, fl6->flowi6_oif); | |
536b2e92 ED |
812 | if (!dev) { |
813 | rcu_read_unlock(); | |
187e3838 | 814 | return -ENODEV; |
536b2e92 ED |
815 | } |
816 | } else if (addr_type & IPV6_ADDR_LINKLOCAL) { | |
817 | rcu_read_unlock(); | |
187e3838 | 818 | return -EINVAL; |
536b2e92 | 819 | } |
1ab1457c | 820 | |
187e3838 YH |
821 | if (addr_type != IPV6_ADDR_ANY) { |
822 | int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL; | |
83ba4645 | 823 | if (!ipv6_can_nonlocal_bind(net, inet_sk(sk)) && |
232378e8 DA |
824 | !ipv6_chk_addr_and_flags(net, &src_info->ipi6_addr, |
825 | dev, !strict, 0, | |
826 | IFA_F_TENTATIVE) && | |
7c90cc2d FLB |
827 | !ipv6_chk_acast_addr_src(net, dev, |
828 | &src_info->ipi6_addr)) | |
187e3838 YH |
829 | err = -EINVAL; |
830 | else | |
4e3fd7a0 | 831 | fl6->saddr = src_info->ipi6_addr; |
1da177e4 | 832 | } |
187e3838 | 833 | |
536b2e92 | 834 | rcu_read_unlock(); |
1da177e4 | 835 | |
187e3838 YH |
836 | if (err) |
837 | goto exit_f; | |
838 | ||
1da177e4 | 839 | break; |
187e3838 | 840 | } |
1da177e4 LT |
841 | |
842 | case IPV6_FLOWINFO: | |
1ab1457c | 843 | if (cmsg->cmsg_len < CMSG_LEN(4)) { |
1da177e4 LT |
844 | err = -EINVAL; |
845 | goto exit_f; | |
846 | } | |
847 | ||
4c9483b2 DM |
848 | if (fl6->flowlabel&IPV6_FLOWINFO_MASK) { |
849 | if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) { | |
1da177e4 LT |
850 | err = -EINVAL; |
851 | goto exit_f; | |
852 | } | |
853 | } | |
4c9483b2 | 854 | fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg); |
1da177e4 LT |
855 | break; |
856 | ||
333fad53 | 857 | case IPV6_2292HOPOPTS: |
1da177e4 | 858 | case IPV6_HOPOPTS: |
1ab1457c | 859 | if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
860 | err = -EINVAL; |
861 | goto exit_f; | |
862 | } | |
863 | ||
864 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
865 | len = ((hdr->hdrlen + 1) << 3); | |
866 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
867 | err = -EINVAL; | |
868 | goto exit_f; | |
869 | } | |
af31f412 | 870 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
871 | err = -EPERM; |
872 | goto exit_f; | |
873 | } | |
874 | opt->opt_nflen += len; | |
875 | opt->hopopt = hdr; | |
876 | break; | |
877 | ||
333fad53 | 878 | case IPV6_2292DSTOPTS: |
1ab1457c | 879 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { |
1da177e4 LT |
880 | err = -EINVAL; |
881 | goto exit_f; | |
882 | } | |
883 | ||
884 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
885 | len = ((hdr->hdrlen + 1) << 3); | |
886 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
887 | err = -EINVAL; | |
888 | goto exit_f; | |
889 | } | |
af31f412 | 890 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
1da177e4 LT |
891 | err = -EPERM; |
892 | goto exit_f; | |
893 | } | |
894 | if (opt->dst1opt) { | |
895 | err = -EINVAL; | |
896 | goto exit_f; | |
897 | } | |
898 | opt->opt_flen += len; | |
899 | opt->dst1opt = hdr; | |
900 | break; | |
901 | ||
333fad53 YH |
902 | case IPV6_DSTOPTS: |
903 | case IPV6_RTHDRDSTOPTS: | |
904 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) { | |
905 | err = -EINVAL; | |
906 | goto exit_f; | |
907 | } | |
908 | ||
909 | hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg); | |
910 | len = ((hdr->hdrlen + 1) << 3); | |
911 | if (cmsg->cmsg_len < CMSG_LEN(len)) { | |
912 | err = -EINVAL; | |
913 | goto exit_f; | |
914 | } | |
af31f412 | 915 | if (!ns_capable(net->user_ns, CAP_NET_RAW)) { |
333fad53 YH |
916 | err = -EPERM; |
917 | goto exit_f; | |
918 | } | |
919 | if (cmsg->cmsg_type == IPV6_DSTOPTS) { | |
920 | opt->opt_flen += len; | |
921 | opt->dst1opt = hdr; | |
922 | } else { | |
923 | opt->opt_nflen += len; | |
924 | opt->dst0opt = hdr; | |
925 | } | |
926 | break; | |
927 | ||
928 | case IPV6_2292RTHDR: | |
1da177e4 | 929 | case IPV6_RTHDR: |
1ab1457c | 930 | if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) { |
1da177e4 LT |
931 | err = -EINVAL; |
932 | goto exit_f; | |
933 | } | |
934 | ||
935 | rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg); | |
936 | ||
280a9d34 | 937 | switch (rthdr->type) { |
07a93626 | 938 | #if IS_ENABLED(CONFIG_IPV6_MIP6) |
280a9d34 | 939 | case IPV6_SRCRT_TYPE_2: |
6e093d9d BH |
940 | if (rthdr->hdrlen != 2 || |
941 | rthdr->segments_left != 1) { | |
942 | err = -EINVAL; | |
943 | goto exit_f; | |
944 | } | |
280a9d34 | 945 | break; |
bb4dbf9e | 946 | #endif |
280a9d34 | 947 | default: |
1da177e4 LT |
948 | err = -EINVAL; |
949 | goto exit_f; | |
950 | } | |
951 | ||
952 | len = ((rthdr->hdrlen + 1) << 3); | |
953 | ||
1ab1457c | 954 | if (cmsg->cmsg_len < CMSG_LEN(len)) { |
1da177e4 LT |
955 | err = -EINVAL; |
956 | goto exit_f; | |
957 | } | |
958 | ||
959 | /* segments left must also match */ | |
960 | if ((rthdr->hdrlen >> 1) != rthdr->segments_left) { | |
961 | err = -EINVAL; | |
962 | goto exit_f; | |
963 | } | |
964 | ||
965 | opt->opt_nflen += len; | |
966 | opt->srcrt = rthdr; | |
967 | ||
333fad53 | 968 | if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) { |
1da177e4 LT |
969 | int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3); |
970 | ||
971 | opt->opt_nflen += dsthdrlen; | |
972 | opt->dst0opt = opt->dst1opt; | |
973 | opt->dst1opt = NULL; | |
974 | opt->opt_flen -= dsthdrlen; | |
975 | } | |
976 | ||
977 | break; | |
978 | ||
333fad53 | 979 | case IPV6_2292HOPLIMIT: |
1da177e4 LT |
980 | case IPV6_HOPLIMIT: |
981 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) { | |
982 | err = -EINVAL; | |
983 | goto exit_f; | |
984 | } | |
985 | ||
26879da5 WW |
986 | ipc6->hlimit = *(int *)CMSG_DATA(cmsg); |
987 | if (ipc6->hlimit < -1 || ipc6->hlimit > 0xff) { | |
e8766fc8 SW |
988 | err = -EINVAL; |
989 | goto exit_f; | |
990 | } | |
991 | ||
1da177e4 LT |
992 | break; |
993 | ||
41a1f8ea YH |
994 | case IPV6_TCLASS: |
995 | { | |
996 | int tc; | |
997 | ||
998 | err = -EINVAL; | |
b5a4257c | 999 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
41a1f8ea | 1000 | goto exit_f; |
41a1f8ea YH |
1001 | |
1002 | tc = *(int *)CMSG_DATA(cmsg); | |
d0ee011f | 1003 | if (tc < -1 || tc > 0xff) |
41a1f8ea YH |
1004 | goto exit_f; |
1005 | ||
1006 | err = 0; | |
26879da5 | 1007 | ipc6->tclass = tc; |
41a1f8ea | 1008 | |
13b52cd4 BH |
1009 | break; |
1010 | } | |
1011 | ||
1012 | case IPV6_DONTFRAG: | |
1013 | { | |
1014 | int df; | |
1015 | ||
1016 | err = -EINVAL; | |
b5a4257c | 1017 | if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) |
13b52cd4 | 1018 | goto exit_f; |
13b52cd4 BH |
1019 | |
1020 | df = *(int *)CMSG_DATA(cmsg); | |
1021 | if (df < 0 || df > 1) | |
1022 | goto exit_f; | |
1023 | ||
1024 | err = 0; | |
26879da5 | 1025 | ipc6->dontfrag = df; |
13b52cd4 | 1026 | |
41a1f8ea YH |
1027 | break; |
1028 | } | |
1da177e4 | 1029 | default: |
ba7a46f1 JP |
1030 | net_dbg_ratelimited("invalid cmsg type: %d\n", |
1031 | cmsg->cmsg_type); | |
1da177e4 | 1032 | err = -EINVAL; |
4a36702e | 1033 | goto exit_f; |
3ff50b79 | 1034 | } |
1da177e4 LT |
1035 | } |
1036 | ||
1037 | exit_f: | |
1038 | return err; | |
1039 | } | |
73df66f8 | 1040 | EXPORT_SYMBOL_GPL(ip6_datagram_send_ctl); |
17ef66af | 1041 | |
6c206b20 PA |
1042 | void __ip6_dgram_sock_seq_show(struct seq_file *seq, struct sock *sp, |
1043 | __u16 srcp, __u16 destp, int rqueue, int bucket) | |
17ef66af | 1044 | { |
17ef66af LC |
1045 | const struct in6_addr *dest, *src; |
1046 | ||
efe4208f ED |
1047 | dest = &sp->sk_v6_daddr; |
1048 | src = &sp->sk_v6_rcv_saddr; | |
17ef66af LC |
1049 | seq_printf(seq, |
1050 | "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X " | |
ea9a0379 | 1051 | "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n", |
17ef66af LC |
1052 | bucket, |
1053 | src->s6_addr32[0], src->s6_addr32[1], | |
1054 | src->s6_addr32[2], src->s6_addr32[3], srcp, | |
1055 | dest->s6_addr32[0], dest->s6_addr32[1], | |
1056 | dest->s6_addr32[2], dest->s6_addr32[3], destp, | |
1057 | sp->sk_state, | |
1058 | sk_wmem_alloc_get(sp), | |
6c206b20 | 1059 | rqueue, |
17ef66af LC |
1060 | 0, 0L, 0, |
1061 | from_kuid_munged(seq_user_ns(seq), sock_i_uid(sp)), | |
1062 | 0, | |
1063 | sock_i_ino(sp), | |
41c6d650 | 1064 | refcount_read(&sp->sk_refcnt), sp, |
17ef66af LC |
1065 | atomic_read(&sp->sk_drops)); |
1066 | } |