1 /*
2 * common UDP/RAW code
3 * Linux INET6 implementation
4 *
5 * Authors:
6 * Pedro Roque <roque@di.fc.ul.pt>
7 *
8 * $Id: datagram.c,v 1.21 2000/11/28 13:42:08 davem Exp $
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public License
12 * as published by the Free Software Foundation; either version
13 * 2 of the License, or (at your option) any later version.
14 */
15
16 #include <linux/errno.h>
17 #include <linux/types.h>
18 #include <linux/kernel.h>
19 #include <linux/sched.h>
20 #include <linux/interrupt.h>
21 #include <linux/socket.h>
22 #include <linux/sockios.h>
23 #include <linux/in6.h>
24 #include <linux/ipv6.h>
25 #include <linux/route.h>
26
27 #include <net/ipv6.h>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
31
32 #include <linux/errqueue.h>
33 #include <asm/uaccess.h>
34
35 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
36 u16 port, u32 info, u8 *payload)
37 {
38 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
39 struct sock_exterr_skb *serr;
40
41 if (!sk->net_pinfo.af_inet6.recverr)
42 return;
43
44 skb = skb_clone(skb, GFP_ATOMIC);
45 if (!skb)
46 return;
47
48 serr = SKB_EXT_ERR(skb);
49 serr->ee.ee_errno = err;
50 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
51 serr->ee.ee_type = icmph->icmp6_type;
52 serr->ee.ee_code = icmph->icmp6_code;
53 serr->ee.ee_pad = 0;
54 serr->ee.ee_info = info;
55 serr->ee.ee_data = 0;
56 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
57 serr->port = port;
58
59 skb->h.raw = payload;
60 skb_pull(skb, payload - skb->data);
61
62 if (sock_queue_err_skb(sk, skb))
63 kfree_skb(skb);
64 }
65
66 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
67 {
68 struct sock_exterr_skb *serr;
69 struct ipv6hdr *iph;
70 struct sk_buff *skb;
71
72 if (!sk->net_pinfo.af_inet6.recverr)
73 return;
74
75 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
76 if (!skb)
77 return;
78
79 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
80 skb->nh.ipv6h = iph;
81 memcpy(&iph->daddr, fl->fl6_dst, 16);
82
83 serr = SKB_EXT_ERR(skb);
84 serr->ee.ee_errno = err;
85 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
86 serr->ee.ee_type = 0;
87 serr->ee.ee_code = 0;
88 serr->ee.ee_pad = 0;
89 serr->ee.ee_info = info;
90 serr->ee.ee_data = 0;
91 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
92 serr->port = fl->uli_u.ports.dport;
93
94 skb->h.raw = skb->tail;
95 skb_pull(skb, skb->tail - skb->data);
96
97 if (sock_queue_err_skb(sk, skb))
98 kfree_skb(skb);
99 }
100
101 /*
102 * Handle MSG_ERRQUEUE
103 */
104 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
105 {
106 struct sock_exterr_skb *serr;
107 struct sk_buff *skb, *skb2;
108 struct sockaddr_in6 *sin;
109 struct {
110 struct sock_extended_err ee;
111 struct sockaddr_in6 offender;
112 } errhdr;
113 int err;
114 int copied;
115
116 err = -EAGAIN;
117 skb = skb_dequeue(&sk->error_queue);
118 if (skb == NULL)
119 goto out;
120
121 copied = skb->len;
122 if (copied > len) {
123 msg->msg_flags |= MSG_TRUNC;
124 copied = len;
125 }
126 err = memcpy_toiovec(msg->msg_iov, skb->data, copied);
127 if (err)
128 goto out_free_skb;
129
130 sock_recv_timestamp(msg, sk, skb);
131
132 serr = SKB_EXT_ERR(skb);
133
134 sin = (struct sockaddr_in6 *)msg->msg_name;
135 if (sin) {
136 sin->sin6_family = AF_INET6;
137 sin->sin6_flowinfo = 0;
138 sin->sin6_port = serr->port;
139 sin->sin6_scope_id = 0;
140 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
141 memcpy(&sin->sin6_addr, skb->nh.raw + serr->addr_offset, 16);
142 if (sk->net_pinfo.af_inet6.sndflow)
143 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
144 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
145 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
146 sin->sin6_scope_id = opt->iif;
147 }
148 } else {
149 ipv6_addr_set(&sin->sin6_addr, 0, 0,
150 __constant_htonl(0xffff),
151 *(u32*)(skb->nh.raw + serr->addr_offset));
152 }
153 }
154
155 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
156 sin = &errhdr.offender;
157 sin->sin6_family = AF_UNSPEC;
158 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
159 sin->sin6_family = AF_INET6;
160 sin->sin6_flowinfo = 0;
161 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
162 memcpy(&sin->sin6_addr, &skb->nh.ipv6h->saddr, 16);
163 if (sk->net_pinfo.af_inet6.rxopt.all)
164 datagram_recv_ctl(sk, msg, skb);
165 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
166 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
167 sin->sin6_scope_id = opt->iif;
168 }
169 } else {
170 ipv6_addr_set(&sin->sin6_addr, 0, 0,
171 __constant_htonl(0xffff),
172 skb->nh.iph->saddr);
173 if (sk->protinfo.af_inet.cmsg_flags)
174 ip_cmsg_recv(msg, skb);
175 }
176 }
177
178 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
179
180 /* Now we could try to dump offended packet options */
181
182 msg->msg_flags |= MSG_ERRQUEUE;
183 err = copied;
184
185 /* Reset and regenerate socket error */
186 spin_lock_irq(&sk->error_queue.lock);
187 sk->err = 0;
188 if ((skb2 = skb_peek(&sk->error_queue)) != NULL) {
189 sk->err = SKB_EXT_ERR(skb2)->ee.ee_errno;
190 spin_unlock_irq(&sk->error_queue.lock);
191 sk->error_report(sk);
192 } else {
193 spin_unlock_irq(&sk->error_queue.lock);
194 }
195
196 out_free_skb:
197 kfree_skb(skb);
198 out:
199 return err;
200 }
201
202
203
204 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
205 {
206 struct ipv6_pinfo *np = &sk->net_pinfo.af_inet6;
207 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
208
209 if (np->rxopt.bits.rxinfo) {
210 struct in6_pktinfo src_info;
211
212 src_info.ipi6_ifindex = opt->iif;
213 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
214 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
215 }
216
217 if (np->rxopt.bits.rxhlim) {
218 int hlim = skb->nh.ipv6h->hop_limit;
219 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
220 }
221
222 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
223 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
224 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
225 }
226 if (np->rxopt.bits.hopopts && opt->hop) {
227 u8 *ptr = skb->nh.raw + opt->hop;
228 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
229 }
230 if (np->rxopt.bits.dstopts && opt->dst0) {
231 u8 *ptr = skb->nh.raw + opt->dst0;
232 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
233 }
234 if (np->rxopt.bits.srcrt && opt->srcrt) {
235 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
236 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
237 }
238 if (np->rxopt.bits.authhdr && opt->auth) {
239 u8 *ptr = skb->nh.raw + opt->auth;
240 put_cmsg(msg, SOL_IPV6, IPV6_AUTHHDR, (ptr[1]+1)<<2, ptr);
241 }
242 if (np->rxopt.bits.dstopts && opt->dst1) {
243 u8 *ptr = skb->nh.raw + opt->dst1;
244 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
245 }
246 return 0;
247 }
248
249 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
250 struct ipv6_txoptions *opt,
251 int *hlimit)
252 {
253 struct in6_pktinfo *src_info;
254 struct cmsghdr *cmsg;
255 struct ipv6_rt_hdr *rthdr;
256 struct ipv6_opt_hdr *hdr;
257 int len;
258 int err = 0;
259
260 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
261
262 if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
263 (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
264 + cmsg->cmsg_len) > msg->msg_controllen) {
265 err = -EINVAL;
266 goto exit_f;
267 }
268
269 if (cmsg->cmsg_level != SOL_IPV6)
270 continue;
271
272 switch (cmsg->cmsg_type) {
273 case IPV6_PKTINFO:
274 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
275 err = -EINVAL;
276 goto exit_f;
277 }
278
279 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
280
281 if (src_info->ipi6_ifindex) {
282 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
283 return -EINVAL;
284 fl->oif = src_info->ipi6_ifindex;
285 }
286
287 if (!ipv6_addr_any(&src_info->ipi6_addr)) {
288 if (!ipv6_chk_addr(&src_info->ipi6_addr, NULL)) {
289 err = -EINVAL;
290 goto exit_f;
291 }
292
293 fl->fl6_src = &src_info->ipi6_addr;
294 }
295
296 break;
297
298 case IPV6_FLOWINFO:
299 if (cmsg->cmsg_len < CMSG_LEN(4)) {
300 err = -EINVAL;
301 goto exit_f;
302 }
303
304 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
305 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
306 err = -EINVAL;
307 goto exit_f;
308 }
309 }
310 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
311 break;
312
313 case IPV6_HOPOPTS:
314 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
315 err = -EINVAL;
316 goto exit_f;
317 }
318
319 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
320 len = ((hdr->hdrlen + 1) << 3);
321 if (cmsg->cmsg_len < CMSG_LEN(len)) {
322 err = -EINVAL;
323 goto exit_f;
324 }
325 if (!capable(CAP_NET_RAW)) {
326 err = -EPERM;
327 goto exit_f;
328 }
329 opt->opt_nflen += len;
330 opt->hopopt = hdr;
331 break;
332
333 case IPV6_DSTOPTS:
334 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
335 err = -EINVAL;
336 goto exit_f;
337 }
338
339 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
340 len = ((hdr->hdrlen + 1) << 3);
341 if (cmsg->cmsg_len < CMSG_LEN(len)) {
342 err = -EINVAL;
343 goto exit_f;
344 }
345 if (!capable(CAP_NET_RAW)) {
346 err = -EPERM;
347 goto exit_f;
348 }
349 if (opt->dst1opt) {
350 err = -EINVAL;
351 goto exit_f;
352 }
353 opt->opt_flen += len;
354 opt->dst1opt = hdr;
355 break;
356
357 case IPV6_AUTHHDR:
358 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
359 err = -EINVAL;
360 goto exit_f;
361 }
362
363 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
364 len = ((hdr->hdrlen + 2) << 2);
365 if (cmsg->cmsg_len < CMSG_LEN(len)) {
366 err = -EINVAL;
367 goto exit_f;
368 }
369 if (len & ~7) {
370 err = -EINVAL;
371 goto exit_f;
372 }
373 opt->opt_flen += len;
374 opt->auth = hdr;
375 break;
376
377 case IPV6_RTHDR:
378 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
379 err = -EINVAL;
380 goto exit_f;
381 }
382
383 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
384
385 /*
386 * TYPE 0
387 */
388 if (rthdr->type) {
389 err = -EINVAL;
390 goto exit_f;
391 }
392
393 len = ((rthdr->hdrlen + 1) << 3);
394
395 if (cmsg->cmsg_len < CMSG_LEN(len)) {
396 err = -EINVAL;
397 goto exit_f;
398 }
399
400 /* segments left must also match */
401 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
402 err = -EINVAL;
403 goto exit_f;
404 }
405
406 opt->opt_nflen += len;
407 opt->srcrt = rthdr;
408
409 if (opt->dst1opt) {
410 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
411
412 opt->opt_nflen += dsthdrlen;
413 opt->dst0opt = opt->dst1opt;
414 opt->dst1opt = NULL;
415 opt->opt_flen -= dsthdrlen;
416 }
417
418 break;
419
420 case IPV6_HOPLIMIT:
421 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
422 err = -EINVAL;
423 goto exit_f;
424 }
425
426 *hlimit = *(int *)CMSG_DATA(cmsg);
427 break;
428
429 default:
430 printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type);
431 err = -EINVAL;
432 break;
433 };
434 }
435
436 exit_f:
437 return err;
438 }
439
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