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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[deliverable/linux.git] / net / ipv6 / datagram.c
CommitLineData
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>
1da177e4
LT		 25
26#include <net/ipv6.h>
27#include <net/ndisc.h>
28#include <net/addrconf.h>
29#include <net/transp_v6.h>
30#include <net/ip6_route.h>
c752f073 31#include <net/tcp_states.h>
1da177e4
LT		 32
33#include <linux/errqueue.h>
34#include <asm/uaccess.h>
35
c15fea2d
MM		 36static inline int ipv6_mapped_addr_any(const struct in6_addr *a)
37{
38 return (ipv6_addr_v4mapped(a) && (a->s6_addr32[3] == 0));
39}
40
1da177e4
LT		 41int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
42{
43 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
44 struct inet_sock *inet = inet_sk(sk);
45 struct ipv6_pinfo *np = inet6_sk(sk);
20c59de2 46 struct in6_addr *daddr, *final_p, final;
1da177e4 47 struct dst_entry *dst;
4c9483b2 48 struct flowi6 fl6;
1da177e4 49 struct ip6_flowlabel *flowlabel = NULL;
20c59de2 50 struct ipv6_txoptions *opt;
1da177e4
LT		 51 int addr_type;
52 int err;
53
54 if (usin->sin6_family == AF_INET) {
55 if (__ipv6_only_sock(sk))
56 return -EAFNOSUPPORT;
57 err = ip4_datagram_connect(sk, uaddr, addr_len);
58 goto ipv4_connected;
59 }
60
61 if (addr_len < SIN6_LEN_RFC2133)
1ab1457c 62 return -EINVAL;
1da177e4 63
1ab1457c
YH		 64 if (usin->sin6_family != AF_INET6)
65 return -EAFNOSUPPORT;
1da177e4 66
4c9483b2 67 memset(&fl6, 0, sizeof(fl6));
1da177e4 68 if (np->sndflow) {
4c9483b2
DM		 69 fl6.flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
70 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
71 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
1da177e4
LT		 72 if (flowlabel == NULL)
73 return -EINVAL;
74 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
75 }
76 }
77
78 addr_type = ipv6_addr_type(&usin->sin6_addr);
79
80 if (addr_type == IPV6_ADDR_ANY) {
81 /*
82 * connect to self
83 */
84 usin->sin6_addr.s6_addr[15] = 0x01;
85 }
86
87 daddr = &usin->sin6_addr;
88
89 if (addr_type == IPV6_ADDR_MAPPED) {
90 struct sockaddr_in sin;
91
92 if (__ipv6_only_sock(sk)) {
93 err = -ENETUNREACH;
94 goto out;
95 }
96 sin.sin_family = AF_INET;
97 sin.sin_addr.s_addr = daddr->s6_addr32[3];
98 sin.sin_port = usin->sin6_port;
99
1ab1457c
YH		 100 err = ip4_datagram_connect(sk,
101 (struct sockaddr*) &sin,
1da177e4
LT		 102 sizeof(sin));
103
104ipv4_connected:
105 if (err)
106 goto out;
1ab1457c 107
c720c7e8 108 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
1da177e4 109
c15fea2d
MM		 110 if (ipv6_addr_any(&np->saddr) ||
111 ipv6_mapped_addr_any(&np->saddr))
c720c7e8 112 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
b301e82c 113
c15fea2d
MM		 114 if (ipv6_addr_any(&np->rcv_saddr) ||
115 ipv6_mapped_addr_any(&np->rcv_saddr)) {
c720c7e8
ED		 116 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
117 &np->rcv_saddr);
719f8358
ED		 118 if (sk->sk_prot->rehash)
119 sk->sk_prot->rehash(sk);
120 }
1da177e4 121
1da177e4
LT		 122 goto out;
123 }
124
125 if (addr_type&IPV6_ADDR_LINKLOCAL) {
126 if (addr_len >= sizeof(struct sockaddr_in6) &&
127 usin->sin6_scope_id) {
128 if (sk->sk_bound_dev_if &&
129 sk->sk_bound_dev_if != usin->sin6_scope_id) {
130 err = -EINVAL;
131 goto out;
132 }
133 sk->sk_bound_dev_if = usin->sin6_scope_id;
1da177e4
LT		 134 }
135
1ac4f008
BH		 136 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
137 sk->sk_bound_dev_if = np->mcast_oif;
138
1da177e4
LT		 139 /* Connect to link-local address requires an interface */
140 if (!sk->sk_bound_dev_if) {
141 err = -EINVAL;
142 goto out;
143 }
144 }
145
146 ipv6_addr_copy(&np->daddr, daddr);
4c9483b2 147 np->flow_label = fl6.flowlabel;
1da177e4 148
c720c7e8 149 inet->inet_dport = usin->sin6_port;
1da177e4
LT		 150
151 /*
152 * Check for a route to destination an obtain the
153 * destination cache for it.
154 */
155
4c9483b2
DM		 156 fl6.flowi6_proto = sk->sk_protocol;
157 ipv6_addr_copy(&fl6.daddr, &np->daddr);
158 ipv6_addr_copy(&fl6.saddr, &np->saddr);
159 fl6.flowi6_oif = sk->sk_bound_dev_if;
160 fl6.flowi6_mark = sk->sk_mark;
1958b856
DM		 161 fl6.fl6_dport = inet->inet_dport;
162 fl6.fl6_sport = inet->inet_sport;
1da177e4 163
4c9483b2
DM		 164 if (!fl6.flowi6_oif && (addr_type&IPV6_ADDR_MULTICAST))
165 fl6.flowi6_oif = np->mcast_oif;
1da177e4 166
4c9483b2 167 security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
beb8d13b 168
20c59de2 169 opt = flowlabel ? flowlabel->opt : np->opt;
4c9483b2 170 final_p = fl6_update_dst(&fl6, opt, &final);
1da177e4 171
4c9483b2 172 dst = ip6_dst_lookup_flow(sk, &fl6, final_p, true);
68d0c6d3
DM		 173 err = 0;
174 if (IS_ERR(dst)) {
175 err = PTR_ERR(dst);
1da177e4 176 goto out;
14e50e57 177 }
1da177e4
LT		 178
179 /* source address lookup done in ip6_dst_lookup */
180
181 if (ipv6_addr_any(&np->saddr))
4c9483b2 182 ipv6_addr_copy(&np->saddr, &fl6.saddr);
1da177e4
LT		 183
184 if (ipv6_addr_any(&np->rcv_saddr)) {
4c9483b2 185 ipv6_addr_copy(&np->rcv_saddr, &fl6.saddr);
c720c7e8 186 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
719f8358
ED		 187 if (sk->sk_prot->rehash)
188 sk->sk_prot->rehash(sk);
1da177e4
LT		 189 }
190
191 ip6_dst_store(sk, dst,
4c9483b2 192 ipv6_addr_equal(&fl6.daddr, &np->daddr) ?
8e1ef0a9
YH		 193 &np->daddr : NULL,
194#ifdef CONFIG_IPV6_SUBTREES
4c9483b2 195 ipv6_addr_equal(&fl6.saddr, &np->saddr) ?
8e1ef0a9
YH		 196 &np->saddr :
197#endif
198 NULL);
1da177e4
LT		 199
200 sk->sk_state = TCP_ESTABLISHED;
201out:
202 fl6_sock_release(flowlabel);
203 return err;
204}
205
1ab1457c 206void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
e69a4adc 207 __be16 port, u32 info, u8 *payload)
1da177e4
LT		 208{
209 struct ipv6_pinfo *np = inet6_sk(sk);
cc70ab26 210 struct icmp6hdr *icmph = icmp6_hdr(skb);
1da177e4
LT		 211 struct sock_exterr_skb *serr;
212
213 if (!np->recverr)
214 return;
215
216 skb = skb_clone(skb, GFP_ATOMIC);
217 if (!skb)
218 return;
219
d40a4de0
BH		 220 skb->protocol = htons(ETH_P_IPV6);
221
1da177e4
LT		 222 serr = SKB_EXT_ERR(skb);
223 serr->ee.ee_errno = err;
224 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
1ab1457c 225 serr->ee.ee_type = icmph->icmp6_type;
1da177e4
LT		 226 serr->ee.ee_code = icmph->icmp6_code;
227 serr->ee.ee_pad = 0;
228 serr->ee.ee_info = info;
229 serr->ee.ee_data = 0;
d56f90a7
ACM		 230 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
231 skb_network_header(skb);
1da177e4
LT		 232 serr->port = port;
233
1da177e4 234 __skb_pull(skb, payload - skb->data);
bd82393c 235 skb_reset_transport_header(skb);
1da177e4
LT		 236
237 if (sock_queue_err_skb(sk, skb))
238 kfree_skb(skb);
239}
240
4c9483b2 241void ipv6_local_error(struct sock *sk, int err, struct flowi6 *fl6, u32 info)
1da177e4
LT		 242{
243 struct ipv6_pinfo *np = inet6_sk(sk);
244 struct sock_exterr_skb *serr;
245 struct ipv6hdr *iph;
246 struct sk_buff *skb;
247
248 if (!np->recverr)
249 return;
250
251 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
252 if (!skb)
253 return;
254
d40a4de0
BH		 255 skb->protocol = htons(ETH_P_IPV6);
256
1ced98e8
ACM		 257 skb_put(skb, sizeof(struct ipv6hdr));
258 skb_reset_network_header(skb);
0660e03f 259 iph = ipv6_hdr(skb);
4c9483b2 260 ipv6_addr_copy(&iph->daddr, &fl6->daddr);
1da177e4
LT		 261
262 serr = SKB_EXT_ERR(skb);
263 serr->ee.ee_errno = err;
264 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
1ab1457c 265 serr->ee.ee_type = 0;
1da177e4
LT		 266 serr->ee.ee_code = 0;
267 serr->ee.ee_pad = 0;
268 serr->ee.ee_info = info;
269 serr->ee.ee_data = 0;
d56f90a7 270 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
1958b856 271 serr->port = fl6->fl6_dport;
1da177e4 272
27a884dc 273 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
bd82393c 274 skb_reset_transport_header(skb);
1da177e4
LT		 275
276 if (sock_queue_err_skb(sk, skb))
277 kfree_skb(skb);
278}
279
4c9483b2 280void ipv6_local_rxpmtu(struct sock *sk, struct flowi6 *fl6, u32 mtu)
4b340ae2
BH		 281{
282 struct ipv6_pinfo *np = inet6_sk(sk);
283 struct ipv6hdr *iph;
284 struct sk_buff *skb;
285 struct ip6_mtuinfo *mtu_info;
286
287 if (!np->rxopt.bits.rxpmtu)
288 return;
289
290 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
291 if (!skb)
292 return;
293
294 skb_put(skb, sizeof(struct ipv6hdr));
295 skb_reset_network_header(skb);
296 iph = ipv6_hdr(skb);
4c9483b2 297 ipv6_addr_copy(&iph->daddr, &fl6->daddr);
4b340ae2
BH		 298
299 mtu_info = IP6CBMTU(skb);
300 if (!mtu_info) {
301 kfree_skb(skb);
302 return;
303 }
304
305 mtu_info->ip6m_mtu = mtu;
306 mtu_info->ip6m_addr.sin6_family = AF_INET6;
307 mtu_info->ip6m_addr.sin6_port = 0;
308 mtu_info->ip6m_addr.sin6_flowinfo = 0;
4c9483b2 309 mtu_info->ip6m_addr.sin6_scope_id = fl6->flowi6_oif;
4b340ae2
BH		 310 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr);
311
312 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
313 skb_reset_transport_header(skb);
314
315 skb = xchg(&np->rxpmtu, skb);
316 kfree_skb(skb);
317}
318
1ab1457c 319/*
1da177e4
LT		 320 * Handle MSG_ERRQUEUE
321 */
322int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
323{
324 struct ipv6_pinfo *np = inet6_sk(sk);
325 struct sock_exterr_skb *serr;
326 struct sk_buff *skb, *skb2;
327 struct sockaddr_in6 *sin;
328 struct {
329 struct sock_extended_err ee;
330 struct sockaddr_in6 offender;
331 } errhdr;
332 int err;
333 int copied;
334
335 err = -EAGAIN;
336 skb = skb_dequeue(&sk->sk_error_queue);
337 if (skb == NULL)
338 goto out;
339
340 copied = skb->len;
341 if (copied > len) {
342 msg->msg_flags |= MSG_TRUNC;
343 copied = len;
344 }
345 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
346 if (err)
347 goto out_free_skb;
348
349 sock_recv_timestamp(msg, sk, skb);
350
351 serr = SKB_EXT_ERR(skb);
352
353 sin = (struct sockaddr_in6 *)msg->msg_name;
354 if (sin) {
d56f90a7 355 const unsigned char *nh = skb_network_header(skb);
1da177e4
LT		 356 sin->sin6_family = AF_INET6;
357 sin->sin6_flowinfo = 0;
1ab1457c 358 sin->sin6_port = serr->port;
1da177e4 359 sin->sin6_scope_id = 0;
d40a4de0 360 if (skb->protocol == htons(ETH_P_IPV6)) {
1da177e4 361 ipv6_addr_copy(&sin->sin6_addr,
d56f90a7 362 (struct in6_addr *)(nh + serr->addr_offset));
1da177e4 363 if (np->sndflow)
d56f90a7
ACM		 364 sin->sin6_flowinfo =
365 (*(__be32 *)(nh + serr->addr_offset - 24) &
366 IPV6_FLOWINFO_MASK);
1da177e4
LT		 367 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
368 sin->sin6_scope_id = IP6CB(skb)->iif;
369 } else {
b301e82c
BH		 370 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
371 &sin->sin6_addr);
1da177e4
LT		 372 }
373 }
374
375 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
376 sin = &errhdr.offender;
377 sin->sin6_family = AF_UNSPEC;
378 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
379 sin->sin6_family = AF_INET6;
380 sin->sin6_flowinfo = 0;
381 sin->sin6_scope_id = 0;
d40a4de0 382 if (skb->protocol == htons(ETH_P_IPV6)) {
0660e03f 383 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
1da177e4
LT		 384 if (np->rxopt.all)
385 datagram_recv_ctl(sk, msg, skb);
386 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
387 sin->sin6_scope_id = IP6CB(skb)->iif;
388 } else {
389 struct inet_sock *inet = inet_sk(sk);
390
b301e82c
BH		 391 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
392 &sin->sin6_addr);
1da177e4
LT		 393 if (inet->cmsg_flags)
394 ip_cmsg_recv(msg, skb);
395 }
396 }
397
398 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
399
400 /* Now we could try to dump offended packet options */
401
402 msg->msg_flags |= MSG_ERRQUEUE;
403 err = copied;
404
405 /* Reset and regenerate socket error */
e0f9f858 406 spin_lock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 407 sk->sk_err = 0;
408 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
409 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
e0f9f858 410 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 411 sk->sk_error_report(sk);
412 } else {
e0f9f858 413 spin_unlock_bh(&sk->sk_error_queue.lock);
1da177e4
LT		 414 }
415
1ab1457c 416out_free_skb:
1da177e4
LT		 417 kfree_skb(skb);
418out:
419 return err;
420}
421
4b340ae2
BH		 422/*
423 * Handle IPV6_RECVPATHMTU
424 */
425int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
426{
427 struct ipv6_pinfo *np = inet6_sk(sk);
428 struct sk_buff *skb;
429 struct sockaddr_in6 *sin;
430 struct ip6_mtuinfo mtu_info;
431 int err;
432 int copied;
433
434 err = -EAGAIN;
435 skb = xchg(&np->rxpmtu, NULL);
436 if (skb == NULL)
437 goto out;
438
439 copied = skb->len;
440 if (copied > len) {
441 msg->msg_flags |= MSG_TRUNC;
442 copied = len;
443 }
444 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
445 if (err)
446 goto out_free_skb;
447
448 sock_recv_timestamp(msg, sk, skb);
449
450 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
451
452 sin = (struct sockaddr_in6 *)msg->msg_name;
453 if (sin) {
454 sin->sin6_family = AF_INET6;
455 sin->sin6_flowinfo = 0;
456 sin->sin6_port = 0;
457 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
458 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
459 }
460
461 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
462
463 err = copied;
464
465out_free_skb:
466 kfree_skb(skb);
467out:
468 return err;
469}
1da177e4
LT		 470
471
472int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
473{
474 struct ipv6_pinfo *np = inet6_sk(sk);
475 struct inet6_skb_parm *opt = IP6CB(skb);
d56f90a7 476 unsigned char *nh = skb_network_header(skb);
1da177e4
LT		 477
478 if (np->rxopt.bits.rxinfo) {
479 struct in6_pktinfo src_info;
480
481 src_info.ipi6_ifindex = opt->iif;
0660e03f 482 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
1da177e4
LT		 483 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
484 }
485
486 if (np->rxopt.bits.rxhlim) {
0660e03f 487 int hlim = ipv6_hdr(skb)->hop_limit;
1da177e4
LT		 488 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
489 }
490
41a1f8ea 491 if (np->rxopt.bits.rxtclass) {
0660e03f 492 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
41a1f8ea
YH		 493 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
494 }
495
d56f90a7
ACM		 496 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
497 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
1da177e4
LT		 498 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
499 }
333fad53
YH		 500
501 /* HbH is allowed only once */
1da177e4 502 if (np->rxopt.bits.hopopts && opt->hop) {
d56f90a7 503 u8 *ptr = nh + opt->hop;
1da177e4
LT		 504 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
505 }
333fad53
YH		 506
507 if (opt->lastopt &&
508 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
509 /*
510 * Silly enough, but we need to reparse in order to
511 * report extension headers (except for HbH)
512 * in order.
513 *
1ab1457c 514 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
333fad53
YH		 515 * (and WILL NOT be) defined because
516 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
517 */
518 unsigned int off = sizeof(struct ipv6hdr);
0660e03f 519 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
333fad53
YH		 520
521 while (off <= opt->lastopt) {
522 unsigned len;
d56f90a7 523 u8 *ptr = nh + off;
333fad53
YH		 524
525 switch(nexthdr) {
526 case IPPROTO_DSTOPTS:
527 nexthdr = ptr[0];
528 len = (ptr[1] + 1) << 3;
529 if (np->rxopt.bits.dstopts)
530 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
531 break;
532 case IPPROTO_ROUTING:
533 nexthdr = ptr[0];
534 len = (ptr[1] + 1) << 3;
535 if (np->rxopt.bits.srcrt)
536 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
537 break;
538 case IPPROTO_AH:
539 nexthdr = ptr[0];
a3059893 540 len = (ptr[1] + 2) << 2;
333fad53
YH		 541 break;
542 default:
543 nexthdr = ptr[0];
544 len = (ptr[1] + 1) << 3;
545 break;
546 }
547
548 off += len;
549 }
550 }
551
552 /* socket options in old style */
553 if (np->rxopt.bits.rxoinfo) {
554 struct in6_pktinfo src_info;
555
556 src_info.ipi6_ifindex = opt->iif;
0660e03f 557 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
333fad53
YH		 558 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
559 }
560 if (np->rxopt.bits.rxohlim) {
0660e03f 561 int hlim = ipv6_hdr(skb)->hop_limit;
333fad53
YH		 562 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
563 }
564 if (np->rxopt.bits.ohopopts && opt->hop) {
d56f90a7 565 u8 *ptr = nh + opt->hop;
333fad53
YH		 566 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
567 }
568 if (np->rxopt.bits.odstopts && opt->dst0) {
d56f90a7 569 u8 *ptr = nh + opt->dst0;
333fad53 570 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 571 }
333fad53 572 if (np->rxopt.bits.osrcrt && opt->srcrt) {
d56f90a7 573 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
333fad53 574 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
1da177e4 575 }
333fad53 576 if (np->rxopt.bits.odstopts && opt->dst1) {
d56f90a7 577 u8 *ptr = nh + opt->dst1;
333fad53 578 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
1da177e4 579 }
6c468622
BS		 580 if (np->rxopt.bits.rxorigdstaddr) {
581 struct sockaddr_in6 sin6;
582 u16 *ports = (u16 *) skb_transport_header(skb);
583
584 if (skb_transport_offset(skb) + 4 <= skb->len) {
585 /* All current transport protocols have the port numbers in the
586 * first four bytes of the transport header and this function is
587 * written with this assumption in mind.
588 */
589
590 sin6.sin6_family = AF_INET6;
591 ipv6_addr_copy(&sin6.sin6_addr, &ipv6_hdr(skb)->daddr);
592 sin6.sin6_port = ports[1];
593 sin6.sin6_flowinfo = 0;
594 sin6.sin6_scope_id = 0;
595
596 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
597 }
598 }
1da177e4
LT		 599 return 0;
600}
601
91e1908f 602int datagram_send_ctl(struct net *net,
4c9483b2 603 struct msghdr *msg, struct flowi6 *fl6,
1da177e4 604 struct ipv6_txoptions *opt,
13b52cd4 605 int *hlimit, int *tclass, int *dontfrag)
1da177e4
LT		 606{
607 struct in6_pktinfo *src_info;
608 struct cmsghdr *cmsg;
609 struct ipv6_rt_hdr *rthdr;
610 struct ipv6_opt_hdr *hdr;
611 int len;
612 int err = 0;
613
614 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
615 int addr_type;
1da177e4
LT		 616
617 if (!CMSG_OK(msg, cmsg)) {
618 err = -EINVAL;
619 goto exit_f;
620 }
621
622 if (cmsg->cmsg_level != SOL_IPV6)
623 continue;
624
625 switch (cmsg->cmsg_type) {
1ab1457c
YH		 626 case IPV6_PKTINFO:
627 case IPV6_2292PKTINFO:
187e3838
YH		 628 {
629 struct net_device *dev = NULL;
630
1ab1457c 631 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
1da177e4
LT		 632 err = -EINVAL;
633 goto exit_f;
634 }
635
636 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
1ab1457c 637
1da177e4 638 if (src_info->ipi6_ifindex) {
4c9483b2
DM		 639 if (fl6->flowi6_oif &&
640 src_info->ipi6_ifindex != fl6->flowi6_oif)
1da177e4 641 return -EINVAL;
4c9483b2 642 fl6->flowi6_oif = src_info->ipi6_ifindex;
1da177e4
LT		 643 }
644
187e3838 645 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
1da177e4 646
536b2e92 647 rcu_read_lock();
4c9483b2
DM		 648 if (fl6->flowi6_oif) {
649 dev = dev_get_by_index_rcu(net, fl6->flowi6_oif);
536b2e92
ED		 650 if (!dev) {
651 rcu_read_unlock();
187e3838 652 return -ENODEV;
536b2e92
ED		 653 }
654 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
655 rcu_read_unlock();
187e3838 656 return -EINVAL;
536b2e92 657 }
1ab1457c 658
187e3838
YH		 659 if (addr_type != IPV6_ADDR_ANY) {
660 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
91e1908f 661 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
187e3838
YH		 662 strict ? dev : NULL, 0))
663 err = -EINVAL;
664 else
4c9483b2 665 ipv6_addr_copy(&fl6->saddr, &src_info->ipi6_addr);
1da177e4 666 }
187e3838 667
536b2e92 668 rcu_read_unlock();
1da177e4 669
187e3838
YH		 670 if (err)
671 goto exit_f;
672
1da177e4 673 break;
187e3838 674 }
1da177e4
LT		 675
676 case IPV6_FLOWINFO:
1ab1457c 677 if (cmsg->cmsg_len < CMSG_LEN(4)) {
1da177e4
LT		 678 err = -EINVAL;
679 goto exit_f;
680 }
681
4c9483b2
DM		 682 if (fl6->flowlabel&IPV6_FLOWINFO_MASK) {
683 if ((fl6->flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
1da177e4
LT		 684 err = -EINVAL;
685 goto exit_f;
686 }
687 }
4c9483b2 688 fl6->flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
1da177e4
LT		 689 break;
690
333fad53 691 case IPV6_2292HOPOPTS:
1da177e4 692 case IPV6_HOPOPTS:
1ab1457c 693 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
1da177e4
LT		 694 err = -EINVAL;
695 goto exit_f;
696 }
697
698 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
699 len = ((hdr->hdrlen + 1) << 3);
700 if (cmsg->cmsg_len < CMSG_LEN(len)) {
701 err = -EINVAL;
702 goto exit_f;
703 }
704 if (!capable(CAP_NET_RAW)) {
705 err = -EPERM;
706 goto exit_f;
707 }
708 opt->opt_nflen += len;
709 opt->hopopt = hdr;
710 break;
711
333fad53 712 case IPV6_2292DSTOPTS:
1ab1457c 713 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
1da177e4
LT		 714 err = -EINVAL;
715 goto exit_f;
716 }
717
718 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
719 len = ((hdr->hdrlen + 1) << 3);
720 if (cmsg->cmsg_len < CMSG_LEN(len)) {
721 err = -EINVAL;
722 goto exit_f;
723 }
724 if (!capable(CAP_NET_RAW)) {
725 err = -EPERM;
726 goto exit_f;
727 }
728 if (opt->dst1opt) {
729 err = -EINVAL;
730 goto exit_f;
731 }
732 opt->opt_flen += len;
733 opt->dst1opt = hdr;
734 break;
735
333fad53
YH		 736 case IPV6_DSTOPTS:
737 case IPV6_RTHDRDSTOPTS:
738 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
739 err = -EINVAL;
740 goto exit_f;
741 }
742
743 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
744 len = ((hdr->hdrlen + 1) << 3);
745 if (cmsg->cmsg_len < CMSG_LEN(len)) {
746 err = -EINVAL;
747 goto exit_f;
748 }
749 if (!capable(CAP_NET_RAW)) {
750 err = -EPERM;
751 goto exit_f;
752 }
753 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
754 opt->opt_flen += len;
755 opt->dst1opt = hdr;
756 } else {
757 opt->opt_nflen += len;
758 opt->dst0opt = hdr;
759 }
760 break;
761
762 case IPV6_2292RTHDR:
1da177e4 763 case IPV6_RTHDR:
1ab1457c 764 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
1da177e4
LT		 765 err = -EINVAL;
766 goto exit_f;
767 }
768
769 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
770
280a9d34 771 switch (rthdr->type) {
59fbb3a6 772#if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
280a9d34 773 case IPV6_SRCRT_TYPE_2:
6e093d9d
BH		 774 if (rthdr->hdrlen != 2 ||
775 rthdr->segments_left != 1) {
776 err = -EINVAL;
777 goto exit_f;
778 }
280a9d34 779 break;
bb4dbf9e 780#endif
280a9d34 781 default:
1da177e4
LT		 782 err = -EINVAL;
783 goto exit_f;
784 }
785
786 len = ((rthdr->hdrlen + 1) << 3);
787
1ab1457c 788 if (cmsg->cmsg_len < CMSG_LEN(len)) {
1da177e4
LT		 789 err = -EINVAL;
790 goto exit_f;
791 }
792
793 /* segments left must also match */
794 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
795 err = -EINVAL;
796 goto exit_f;
797 }
798
799 opt->opt_nflen += len;
800 opt->srcrt = rthdr;
801
333fad53 802 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
1da177e4
LT		 803 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
804
805 opt->opt_nflen += dsthdrlen;
806 opt->dst0opt = opt->dst1opt;
807 opt->dst1opt = NULL;
808 opt->opt_flen -= dsthdrlen;
809 }
810
811 break;
812
333fad53 813 case IPV6_2292HOPLIMIT:
1da177e4
LT		 814 case IPV6_HOPLIMIT:
815 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
816 err = -EINVAL;
817 goto exit_f;
818 }
819
820 *hlimit = *(int *)CMSG_DATA(cmsg);
e8766fc8
SW		 821 if (*hlimit < -1 || *hlimit > 0xff) {
822 err = -EINVAL;
823 goto exit_f;
824 }
825
1da177e4
LT		 826 break;
827
41a1f8ea
YH		 828 case IPV6_TCLASS:
829 {
830 int tc;
831
832 err = -EINVAL;
833 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
834 goto exit_f;
835 }
836
837 tc = *(int *)CMSG_DATA(cmsg);
d0ee011f 838 if (tc < -1 || tc > 0xff)
41a1f8ea
YH		 839 goto exit_f;
840
841 err = 0;
842 *tclass = tc;
843
13b52cd4
BH		 844 break;
845 }
846
847 case IPV6_DONTFRAG:
848 {
849 int df;
850
851 err = -EINVAL;
852 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
853 goto exit_f;
854 }
855
856 df = *(int *)CMSG_DATA(cmsg);
857 if (df < 0 || df > 1)
858 goto exit_f;
859
860 err = 0;
861 *dontfrag = df;
862
41a1f8ea
YH		 863 break;
864 }
1da177e4 865 default:
64ce2073 866 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",
1ab1457c 867 cmsg->cmsg_type);
1da177e4 868 err = -EINVAL;
4a36702e 869 goto exit_f;
3ff50b79 870 }
1da177e4
LT		 871 }
872
873exit_f:
874 return err;
875}
Linux kernel - Deliverables
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