3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
8 * $Id: datagram.c,v 1.24 2002/02/01 22:01:04 davem Exp $
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.
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>
28 #include <net/ndisc.h>
29 #include <net/addrconf.h>
30 #include <net/transp_v6.h>
32 #include <linux/errqueue.h>
33 #include <asm/uaccess.h>
35 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
36 u16 port, u32 info, u8 *payload)
38 struct ipv6_pinfo *np = inet6_sk(sk);
39 struct icmp6hdr *icmph = (struct icmp6hdr *)skb->h.raw;
40 struct sock_exterr_skb *serr;
45 skb = skb_clone(skb, GFP_ATOMIC);
49 serr = SKB_EXT_ERR(skb);
50 serr->ee.ee_errno = err;
51 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
52 serr->ee.ee_type = icmph->icmp6_type;
53 serr->ee.ee_code = icmph->icmp6_code;
55 serr->ee.ee_info = info;
57 serr->addr_offset = (u8*)&(((struct ipv6hdr*)(icmph+1))->daddr) - skb->nh.raw;
61 __skb_pull(skb, payload - skb->data);
63 if (sock_queue_err_skb(sk, skb))
67 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
69 struct ipv6_pinfo *np = inet6_sk(sk);
70 struct sock_exterr_skb *serr;
77 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
81 iph = (struct ipv6hdr*)skb_put(skb, sizeof(struct ipv6hdr));
83 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
85 serr = SKB_EXT_ERR(skb);
86 serr->ee.ee_errno = err;
87 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
91 serr->ee.ee_info = info;
93 serr->addr_offset = (u8*)&iph->daddr - skb->nh.raw;
94 serr->port = fl->fl_ip_dport;
96 skb->h.raw = skb->tail;
97 __skb_pull(skb, skb->tail - skb->data);
99 if (sock_queue_err_skb(sk, skb))
104 * Handle MSG_ERRQUEUE
106 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
108 struct ipv6_pinfo *np = inet6_sk(sk);
109 struct sock_exterr_skb *serr;
110 struct sk_buff *skb, *skb2;
111 struct sockaddr_in6 *sin;
113 struct sock_extended_err ee;
114 struct sockaddr_in6 offender;
120 skb = skb_dequeue(&sk->sk_error_queue);
126 msg->msg_flags |= MSG_TRUNC;
129 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
133 sock_recv_timestamp(msg, sk, skb);
135 serr = SKB_EXT_ERR(skb);
137 sin = (struct sockaddr_in6 *)msg->msg_name;
139 sin->sin6_family = AF_INET6;
140 sin->sin6_flowinfo = 0;
141 sin->sin6_port = serr->port;
142 sin->sin6_scope_id = 0;
143 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
144 ipv6_addr_copy(&sin->sin6_addr,
145 (struct in6_addr *)(skb->nh.raw + serr->addr_offset));
147 sin->sin6_flowinfo = *(u32*)(skb->nh.raw + serr->addr_offset - 24) & IPV6_FLOWINFO_MASK;
148 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
149 sin->sin6_scope_id = IP6CB(skb)->iif;
151 ipv6_addr_set(&sin->sin6_addr, 0, 0,
153 *(u32*)(skb->nh.raw + serr->addr_offset));
157 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
158 sin = &errhdr.offender;
159 sin->sin6_family = AF_UNSPEC;
160 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
161 sin->sin6_family = AF_INET6;
162 sin->sin6_flowinfo = 0;
163 sin->sin6_scope_id = 0;
164 if (serr->ee.ee_origin == SO_EE_ORIGIN_ICMP6) {
165 ipv6_addr_copy(&sin->sin6_addr, &skb->nh.ipv6h->saddr);
167 datagram_recv_ctl(sk, msg, skb);
168 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
169 sin->sin6_scope_id = IP6CB(skb)->iif;
171 struct inet_opt *inet = inet_sk(sk);
173 ipv6_addr_set(&sin->sin6_addr, 0, 0,
176 if (inet->cmsg_flags)
177 ip_cmsg_recv(msg, skb);
181 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
183 /* Now we could try to dump offended packet options */
185 msg->msg_flags |= MSG_ERRQUEUE;
188 /* Reset and regenerate socket error */
189 spin_lock_irq(&sk->sk_error_queue.lock);
191 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
192 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
193 spin_unlock_irq(&sk->sk_error_queue.lock);
194 sk->sk_error_report(sk);
196 spin_unlock_irq(&sk->sk_error_queue.lock);
207 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
209 struct ipv6_pinfo *np = inet6_sk(sk);
210 struct inet6_skb_parm *opt = IP6CB(skb);
212 if (np->rxopt.bits.rxinfo) {
213 struct in6_pktinfo src_info;
215 src_info.ipi6_ifindex = opt->iif;
216 ipv6_addr_copy(&src_info.ipi6_addr, &skb->nh.ipv6h->daddr);
217 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
220 if (np->rxopt.bits.rxhlim) {
221 int hlim = skb->nh.ipv6h->hop_limit;
222 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
225 if (np->rxopt.bits.rxflow && (*(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK)) {
226 u32 flowinfo = *(u32*)skb->nh.raw & IPV6_FLOWINFO_MASK;
227 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
229 if (np->rxopt.bits.hopopts && opt->hop) {
230 u8 *ptr = skb->nh.raw + opt->hop;
231 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
233 if (np->rxopt.bits.dstopts && opt->dst0) {
234 u8 *ptr = skb->nh.raw + opt->dst0;
235 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
237 if (np->rxopt.bits.srcrt && opt->srcrt) {
238 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(skb->nh.raw + opt->srcrt);
239 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
241 if (np->rxopt.bits.dstopts && opt->dst1) {
242 u8 *ptr = skb->nh.raw + opt->dst1;
243 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, (ptr[1]+1)<<3, ptr);
248 int datagram_send_ctl(struct msghdr *msg, struct flowi *fl,
249 struct ipv6_txoptions *opt,
252 struct in6_pktinfo *src_info;
253 struct cmsghdr *cmsg;
254 struct ipv6_rt_hdr *rthdr;
255 struct ipv6_opt_hdr *hdr;
259 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
261 struct net_device *dev = NULL;
263 if (cmsg->cmsg_len < sizeof(struct cmsghdr) ||
264 (unsigned long)(((char*)cmsg - (char*)msg->msg_control)
265 + cmsg->cmsg_len) > msg->msg_controllen) {
270 if (cmsg->cmsg_level != SOL_IPV6)
273 switch (cmsg->cmsg_type) {
275 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
280 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
282 if (src_info->ipi6_ifindex) {
283 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
285 fl->oif = src_info->ipi6_ifindex;
288 addr_type = ipv6_addr_type(&src_info->ipi6_addr);
290 if (addr_type == IPV6_ADDR_ANY)
293 if (addr_type & IPV6_ADDR_LINKLOCAL) {
294 if (!src_info->ipi6_ifindex)
297 dev = dev_get_by_index(src_info->ipi6_ifindex);
302 if (!ipv6_chk_addr(&src_info->ipi6_addr, dev, 0)) {
311 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
315 if (cmsg->cmsg_len < CMSG_LEN(4)) {
320 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
321 if ((fl->fl6_flowlabel^*(u32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
326 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(u32 *)CMSG_DATA(cmsg);
330 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
335 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
336 len = ((hdr->hdrlen + 1) << 3);
337 if (cmsg->cmsg_len < CMSG_LEN(len)) {
341 if (!capable(CAP_NET_RAW)) {
345 opt->opt_nflen += len;
350 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
355 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
356 len = ((hdr->hdrlen + 1) << 3);
357 if (cmsg->cmsg_len < CMSG_LEN(len)) {
361 if (!capable(CAP_NET_RAW)) {
369 opt->opt_flen += len;
374 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
379 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
389 len = ((rthdr->hdrlen + 1) << 3);
391 if (cmsg->cmsg_len < CMSG_LEN(len)) {
396 /* segments left must also match */
397 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
402 opt->opt_nflen += len;
406 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
408 opt->opt_nflen += dsthdrlen;
409 opt->dst0opt = opt->dst1opt;
411 opt->opt_flen -= dsthdrlen;
417 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
422 *hlimit = *(int *)CMSG_DATA(cmsg);
427 printk(KERN_DEBUG "invalid cmsg type: %d\n", cmsg->cmsg_type));