3 * Linux INET6 implementation
6 * Pedro Roque <roque@di.fc.ul.pt>
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.
14 #include <linux/capability.h>
15 #include <linux/errno.h>
16 #include <linux/types.h>
17 #include <linux/kernel.h>
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>
24 #include <linux/slab.h>
27 #include <net/ndisc.h>
28 #include <net/addrconf.h>
29 #include <net/transp_v6.h>
30 #include <net/ip6_route.h>
31 #include <net/tcp_states.h>
33 #include <linux/errqueue.h>
34 #include <asm/uaccess.h>
36 int ip6_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
38 struct sockaddr_in6 *usin = (struct sockaddr_in6 *) uaddr;
39 struct inet_sock *inet = inet_sk(sk);
40 struct ipv6_pinfo *np = inet6_sk(sk);
41 struct in6_addr *daddr, *final_p, final;
42 struct dst_entry *dst;
44 struct ip6_flowlabel *flowlabel = NULL;
45 struct ipv6_txoptions *opt;
49 if (usin->sin6_family == AF_INET) {
50 if (__ipv6_only_sock(sk))
52 err = ip4_datagram_connect(sk, uaddr, addr_len);
56 if (addr_len < SIN6_LEN_RFC2133)
59 if (usin->sin6_family != AF_INET6)
62 memset(&fl, 0, sizeof(fl));
64 fl.fl6_flowlabel = usin->sin6_flowinfo&IPV6_FLOWINFO_MASK;
65 if (fl.fl6_flowlabel&IPV6_FLOWLABEL_MASK) {
66 flowlabel = fl6_sock_lookup(sk, fl.fl6_flowlabel);
67 if (flowlabel == NULL)
69 ipv6_addr_copy(&usin->sin6_addr, &flowlabel->dst);
73 addr_type = ipv6_addr_type(&usin->sin6_addr);
75 if (addr_type == IPV6_ADDR_ANY) {
79 usin->sin6_addr.s6_addr[15] = 0x01;
82 daddr = &usin->sin6_addr;
84 if (addr_type == IPV6_ADDR_MAPPED) {
85 struct sockaddr_in sin;
87 if (__ipv6_only_sock(sk)) {
91 sin.sin_family = AF_INET;
92 sin.sin_addr.s_addr = daddr->s6_addr32[3];
93 sin.sin_port = usin->sin6_port;
95 err = ip4_datagram_connect(sk,
96 (struct sockaddr*) &sin,
103 ipv6_addr_set_v4mapped(inet->inet_daddr, &np->daddr);
105 if (ipv6_addr_any(&np->saddr))
106 ipv6_addr_set_v4mapped(inet->inet_saddr, &np->saddr);
108 if (ipv6_addr_any(&np->rcv_saddr)) {
109 ipv6_addr_set_v4mapped(inet->inet_rcv_saddr,
111 if (sk->sk_prot->rehash)
112 sk->sk_prot->rehash(sk);
118 if (addr_type&IPV6_ADDR_LINKLOCAL) {
119 if (addr_len >= sizeof(struct sockaddr_in6) &&
120 usin->sin6_scope_id) {
121 if (sk->sk_bound_dev_if &&
122 sk->sk_bound_dev_if != usin->sin6_scope_id) {
126 sk->sk_bound_dev_if = usin->sin6_scope_id;
129 if (!sk->sk_bound_dev_if && (addr_type & IPV6_ADDR_MULTICAST))
130 sk->sk_bound_dev_if = np->mcast_oif;
132 /* Connect to link-local address requires an interface */
133 if (!sk->sk_bound_dev_if) {
139 ipv6_addr_copy(&np->daddr, daddr);
140 np->flow_label = fl.fl6_flowlabel;
142 inet->inet_dport = usin->sin6_port;
145 * Check for a route to destination an obtain the
146 * destination cache for it.
149 fl.proto = sk->sk_protocol;
150 ipv6_addr_copy(&fl.fl6_dst, &np->daddr);
151 ipv6_addr_copy(&fl.fl6_src, &np->saddr);
152 fl.oif = sk->sk_bound_dev_if;
153 fl.mark = sk->sk_mark;
154 fl.fl_ip_dport = inet->inet_dport;
155 fl.fl_ip_sport = inet->inet_sport;
157 if (!fl.oif && (addr_type&IPV6_ADDR_MULTICAST))
158 fl.oif = np->mcast_oif;
160 security_sk_classify_flow(sk, &fl);
162 opt = flowlabel ? flowlabel->opt : np->opt;
163 final_p = fl6_update_dst(&fl, opt, &final);
165 dst = ip6_dst_lookup_flow(sk, &fl, final_p, true);
172 /* source address lookup done in ip6_dst_lookup */
174 if (ipv6_addr_any(&np->saddr))
175 ipv6_addr_copy(&np->saddr, &fl.fl6_src);
177 if (ipv6_addr_any(&np->rcv_saddr)) {
178 ipv6_addr_copy(&np->rcv_saddr, &fl.fl6_src);
179 inet->inet_rcv_saddr = LOOPBACK4_IPV6;
180 if (sk->sk_prot->rehash)
181 sk->sk_prot->rehash(sk);
184 ip6_dst_store(sk, dst,
185 ipv6_addr_equal(&fl.fl6_dst, &np->daddr) ?
187 #ifdef CONFIG_IPV6_SUBTREES
188 ipv6_addr_equal(&fl.fl6_src, &np->saddr) ?
193 sk->sk_state = TCP_ESTABLISHED;
195 fl6_sock_release(flowlabel);
199 void ipv6_icmp_error(struct sock *sk, struct sk_buff *skb, int err,
200 __be16 port, u32 info, u8 *payload)
202 struct ipv6_pinfo *np = inet6_sk(sk);
203 struct icmp6hdr *icmph = icmp6_hdr(skb);
204 struct sock_exterr_skb *serr;
209 skb = skb_clone(skb, GFP_ATOMIC);
213 skb->protocol = htons(ETH_P_IPV6);
215 serr = SKB_EXT_ERR(skb);
216 serr->ee.ee_errno = err;
217 serr->ee.ee_origin = SO_EE_ORIGIN_ICMP6;
218 serr->ee.ee_type = icmph->icmp6_type;
219 serr->ee.ee_code = icmph->icmp6_code;
221 serr->ee.ee_info = info;
222 serr->ee.ee_data = 0;
223 serr->addr_offset = (u8 *)&(((struct ipv6hdr *)(icmph + 1))->daddr) -
224 skb_network_header(skb);
227 __skb_pull(skb, payload - skb->data);
228 skb_reset_transport_header(skb);
230 if (sock_queue_err_skb(sk, skb))
234 void ipv6_local_error(struct sock *sk, int err, struct flowi *fl, u32 info)
236 struct ipv6_pinfo *np = inet6_sk(sk);
237 struct sock_exterr_skb *serr;
244 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
248 skb->protocol = htons(ETH_P_IPV6);
250 skb_put(skb, sizeof(struct ipv6hdr));
251 skb_reset_network_header(skb);
253 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
255 serr = SKB_EXT_ERR(skb);
256 serr->ee.ee_errno = err;
257 serr->ee.ee_origin = SO_EE_ORIGIN_LOCAL;
258 serr->ee.ee_type = 0;
259 serr->ee.ee_code = 0;
261 serr->ee.ee_info = info;
262 serr->ee.ee_data = 0;
263 serr->addr_offset = (u8 *)&iph->daddr - skb_network_header(skb);
264 serr->port = fl->fl_ip_dport;
266 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
267 skb_reset_transport_header(skb);
269 if (sock_queue_err_skb(sk, skb))
273 void ipv6_local_rxpmtu(struct sock *sk, struct flowi *fl, u32 mtu)
275 struct ipv6_pinfo *np = inet6_sk(sk);
278 struct ip6_mtuinfo *mtu_info;
280 if (!np->rxopt.bits.rxpmtu)
283 skb = alloc_skb(sizeof(struct ipv6hdr), GFP_ATOMIC);
287 skb_put(skb, sizeof(struct ipv6hdr));
288 skb_reset_network_header(skb);
290 ipv6_addr_copy(&iph->daddr, &fl->fl6_dst);
292 mtu_info = IP6CBMTU(skb);
298 mtu_info->ip6m_mtu = mtu;
299 mtu_info->ip6m_addr.sin6_family = AF_INET6;
300 mtu_info->ip6m_addr.sin6_port = 0;
301 mtu_info->ip6m_addr.sin6_flowinfo = 0;
302 mtu_info->ip6m_addr.sin6_scope_id = fl->oif;
303 ipv6_addr_copy(&mtu_info->ip6m_addr.sin6_addr, &ipv6_hdr(skb)->daddr);
305 __skb_pull(skb, skb_tail_pointer(skb) - skb->data);
306 skb_reset_transport_header(skb);
308 skb = xchg(&np->rxpmtu, skb);
313 * Handle MSG_ERRQUEUE
315 int ipv6_recv_error(struct sock *sk, struct msghdr *msg, int len)
317 struct ipv6_pinfo *np = inet6_sk(sk);
318 struct sock_exterr_skb *serr;
319 struct sk_buff *skb, *skb2;
320 struct sockaddr_in6 *sin;
322 struct sock_extended_err ee;
323 struct sockaddr_in6 offender;
329 skb = skb_dequeue(&sk->sk_error_queue);
335 msg->msg_flags |= MSG_TRUNC;
338 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
342 sock_recv_timestamp(msg, sk, skb);
344 serr = SKB_EXT_ERR(skb);
346 sin = (struct sockaddr_in6 *)msg->msg_name;
348 const unsigned char *nh = skb_network_header(skb);
349 sin->sin6_family = AF_INET6;
350 sin->sin6_flowinfo = 0;
351 sin->sin6_port = serr->port;
352 sin->sin6_scope_id = 0;
353 if (skb->protocol == htons(ETH_P_IPV6)) {
354 ipv6_addr_copy(&sin->sin6_addr,
355 (struct in6_addr *)(nh + serr->addr_offset));
358 (*(__be32 *)(nh + serr->addr_offset - 24) &
360 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
361 sin->sin6_scope_id = IP6CB(skb)->iif;
363 ipv6_addr_set_v4mapped(*(__be32 *)(nh + serr->addr_offset),
368 memcpy(&errhdr.ee, &serr->ee, sizeof(struct sock_extended_err));
369 sin = &errhdr.offender;
370 sin->sin6_family = AF_UNSPEC;
371 if (serr->ee.ee_origin != SO_EE_ORIGIN_LOCAL) {
372 sin->sin6_family = AF_INET6;
373 sin->sin6_flowinfo = 0;
374 sin->sin6_scope_id = 0;
375 if (skb->protocol == htons(ETH_P_IPV6)) {
376 ipv6_addr_copy(&sin->sin6_addr, &ipv6_hdr(skb)->saddr);
378 datagram_recv_ctl(sk, msg, skb);
379 if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
380 sin->sin6_scope_id = IP6CB(skb)->iif;
382 struct inet_sock *inet = inet_sk(sk);
384 ipv6_addr_set_v4mapped(ip_hdr(skb)->saddr,
386 if (inet->cmsg_flags)
387 ip_cmsg_recv(msg, skb);
391 put_cmsg(msg, SOL_IPV6, IPV6_RECVERR, sizeof(errhdr), &errhdr);
393 /* Now we could try to dump offended packet options */
395 msg->msg_flags |= MSG_ERRQUEUE;
398 /* Reset and regenerate socket error */
399 spin_lock_bh(&sk->sk_error_queue.lock);
401 if ((skb2 = skb_peek(&sk->sk_error_queue)) != NULL) {
402 sk->sk_err = SKB_EXT_ERR(skb2)->ee.ee_errno;
403 spin_unlock_bh(&sk->sk_error_queue.lock);
404 sk->sk_error_report(sk);
406 spin_unlock_bh(&sk->sk_error_queue.lock);
416 * Handle IPV6_RECVPATHMTU
418 int ipv6_recv_rxpmtu(struct sock *sk, struct msghdr *msg, int len)
420 struct ipv6_pinfo *np = inet6_sk(sk);
422 struct sockaddr_in6 *sin;
423 struct ip6_mtuinfo mtu_info;
428 skb = xchg(&np->rxpmtu, NULL);
434 msg->msg_flags |= MSG_TRUNC;
437 err = skb_copy_datagram_iovec(skb, 0, msg->msg_iov, copied);
441 sock_recv_timestamp(msg, sk, skb);
443 memcpy(&mtu_info, IP6CBMTU(skb), sizeof(mtu_info));
445 sin = (struct sockaddr_in6 *)msg->msg_name;
447 sin->sin6_family = AF_INET6;
448 sin->sin6_flowinfo = 0;
450 sin->sin6_scope_id = mtu_info.ip6m_addr.sin6_scope_id;
451 ipv6_addr_copy(&sin->sin6_addr, &mtu_info.ip6m_addr.sin6_addr);
454 put_cmsg(msg, SOL_IPV6, IPV6_PATHMTU, sizeof(mtu_info), &mtu_info);
465 int datagram_recv_ctl(struct sock *sk, struct msghdr *msg, struct sk_buff *skb)
467 struct ipv6_pinfo *np = inet6_sk(sk);
468 struct inet6_skb_parm *opt = IP6CB(skb);
469 unsigned char *nh = skb_network_header(skb);
471 if (np->rxopt.bits.rxinfo) {
472 struct in6_pktinfo src_info;
474 src_info.ipi6_ifindex = opt->iif;
475 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
476 put_cmsg(msg, SOL_IPV6, IPV6_PKTINFO, sizeof(src_info), &src_info);
479 if (np->rxopt.bits.rxhlim) {
480 int hlim = ipv6_hdr(skb)->hop_limit;
481 put_cmsg(msg, SOL_IPV6, IPV6_HOPLIMIT, sizeof(hlim), &hlim);
484 if (np->rxopt.bits.rxtclass) {
485 int tclass = (ntohl(*(__be32 *)ipv6_hdr(skb)) >> 20) & 0xff;
486 put_cmsg(msg, SOL_IPV6, IPV6_TCLASS, sizeof(tclass), &tclass);
489 if (np->rxopt.bits.rxflow && (*(__be32 *)nh & IPV6_FLOWINFO_MASK)) {
490 __be32 flowinfo = *(__be32 *)nh & IPV6_FLOWINFO_MASK;
491 put_cmsg(msg, SOL_IPV6, IPV6_FLOWINFO, sizeof(flowinfo), &flowinfo);
494 /* HbH is allowed only once */
495 if (np->rxopt.bits.hopopts && opt->hop) {
496 u8 *ptr = nh + opt->hop;
497 put_cmsg(msg, SOL_IPV6, IPV6_HOPOPTS, (ptr[1]+1)<<3, ptr);
501 (np->rxopt.bits.dstopts || np->rxopt.bits.srcrt)) {
503 * Silly enough, but we need to reparse in order to
504 * report extension headers (except for HbH)
507 * Also note that IPV6_RECVRTHDRDSTOPTS is NOT
508 * (and WILL NOT be) defined because
509 * IPV6_RECVDSTOPTS is more generic. --yoshfuji
511 unsigned int off = sizeof(struct ipv6hdr);
512 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
514 while (off <= opt->lastopt) {
519 case IPPROTO_DSTOPTS:
521 len = (ptr[1] + 1) << 3;
522 if (np->rxopt.bits.dstopts)
523 put_cmsg(msg, SOL_IPV6, IPV6_DSTOPTS, len, ptr);
525 case IPPROTO_ROUTING:
527 len = (ptr[1] + 1) << 3;
528 if (np->rxopt.bits.srcrt)
529 put_cmsg(msg, SOL_IPV6, IPV6_RTHDR, len, ptr);
533 len = (ptr[1] + 2) << 2;
537 len = (ptr[1] + 1) << 3;
545 /* socket options in old style */
546 if (np->rxopt.bits.rxoinfo) {
547 struct in6_pktinfo src_info;
549 src_info.ipi6_ifindex = opt->iif;
550 ipv6_addr_copy(&src_info.ipi6_addr, &ipv6_hdr(skb)->daddr);
551 put_cmsg(msg, SOL_IPV6, IPV6_2292PKTINFO, sizeof(src_info), &src_info);
553 if (np->rxopt.bits.rxohlim) {
554 int hlim = ipv6_hdr(skb)->hop_limit;
555 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPLIMIT, sizeof(hlim), &hlim);
557 if (np->rxopt.bits.ohopopts && opt->hop) {
558 u8 *ptr = nh + opt->hop;
559 put_cmsg(msg, SOL_IPV6, IPV6_2292HOPOPTS, (ptr[1]+1)<<3, ptr);
561 if (np->rxopt.bits.odstopts && opt->dst0) {
562 u8 *ptr = nh + opt->dst0;
563 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
565 if (np->rxopt.bits.osrcrt && opt->srcrt) {
566 struct ipv6_rt_hdr *rthdr = (struct ipv6_rt_hdr *)(nh + opt->srcrt);
567 put_cmsg(msg, SOL_IPV6, IPV6_2292RTHDR, (rthdr->hdrlen+1) << 3, rthdr);
569 if (np->rxopt.bits.odstopts && opt->dst1) {
570 u8 *ptr = nh + opt->dst1;
571 put_cmsg(msg, SOL_IPV6, IPV6_2292DSTOPTS, (ptr[1]+1)<<3, ptr);
573 if (np->rxopt.bits.rxorigdstaddr) {
574 struct sockaddr_in6 sin6;
575 u16 *ports = (u16 *) skb_transport_header(skb);
577 if (skb_transport_offset(skb) + 4 <= skb->len) {
578 /* All current transport protocols have the port numbers in the
579 * first four bytes of the transport header and this function is
580 * written with this assumption in mind.
583 sin6.sin6_family = AF_INET6;
584 ipv6_addr_copy(&sin6.sin6_addr, &ipv6_hdr(skb)->daddr);
585 sin6.sin6_port = ports[1];
586 sin6.sin6_flowinfo = 0;
587 sin6.sin6_scope_id = 0;
589 put_cmsg(msg, SOL_IPV6, IPV6_ORIGDSTADDR, sizeof(sin6), &sin6);
595 int datagram_send_ctl(struct net *net,
596 struct msghdr *msg, struct flowi *fl,
597 struct ipv6_txoptions *opt,
598 int *hlimit, int *tclass, int *dontfrag)
600 struct in6_pktinfo *src_info;
601 struct cmsghdr *cmsg;
602 struct ipv6_rt_hdr *rthdr;
603 struct ipv6_opt_hdr *hdr;
607 for (cmsg = CMSG_FIRSTHDR(msg); cmsg; cmsg = CMSG_NXTHDR(msg, cmsg)) {
610 if (!CMSG_OK(msg, cmsg)) {
615 if (cmsg->cmsg_level != SOL_IPV6)
618 switch (cmsg->cmsg_type) {
620 case IPV6_2292PKTINFO:
622 struct net_device *dev = NULL;
624 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct in6_pktinfo))) {
629 src_info = (struct in6_pktinfo *)CMSG_DATA(cmsg);
631 if (src_info->ipi6_ifindex) {
632 if (fl->oif && src_info->ipi6_ifindex != fl->oif)
634 fl->oif = src_info->ipi6_ifindex;
637 addr_type = __ipv6_addr_type(&src_info->ipi6_addr);
641 dev = dev_get_by_index_rcu(net, fl->oif);
646 } else if (addr_type & IPV6_ADDR_LINKLOCAL) {
651 if (addr_type != IPV6_ADDR_ANY) {
652 int strict = __ipv6_addr_src_scope(addr_type) <= IPV6_ADDR_SCOPE_LINKLOCAL;
653 if (!ipv6_chk_addr(net, &src_info->ipi6_addr,
654 strict ? dev : NULL, 0))
657 ipv6_addr_copy(&fl->fl6_src, &src_info->ipi6_addr);
669 if (cmsg->cmsg_len < CMSG_LEN(4)) {
674 if (fl->fl6_flowlabel&IPV6_FLOWINFO_MASK) {
675 if ((fl->fl6_flowlabel^*(__be32 *)CMSG_DATA(cmsg))&~IPV6_FLOWINFO_MASK) {
680 fl->fl6_flowlabel = IPV6_FLOWINFO_MASK & *(__be32 *)CMSG_DATA(cmsg);
683 case IPV6_2292HOPOPTS:
685 if (opt->hopopt || cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
690 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
691 len = ((hdr->hdrlen + 1) << 3);
692 if (cmsg->cmsg_len < CMSG_LEN(len)) {
696 if (!capable(CAP_NET_RAW)) {
700 opt->opt_nflen += len;
704 case IPV6_2292DSTOPTS:
705 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
710 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
711 len = ((hdr->hdrlen + 1) << 3);
712 if (cmsg->cmsg_len < CMSG_LEN(len)) {
716 if (!capable(CAP_NET_RAW)) {
724 opt->opt_flen += len;
729 case IPV6_RTHDRDSTOPTS:
730 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_opt_hdr))) {
735 hdr = (struct ipv6_opt_hdr *)CMSG_DATA(cmsg);
736 len = ((hdr->hdrlen + 1) << 3);
737 if (cmsg->cmsg_len < CMSG_LEN(len)) {
741 if (!capable(CAP_NET_RAW)) {
745 if (cmsg->cmsg_type == IPV6_DSTOPTS) {
746 opt->opt_flen += len;
749 opt->opt_nflen += len;
756 if (cmsg->cmsg_len < CMSG_LEN(sizeof(struct ipv6_rt_hdr))) {
761 rthdr = (struct ipv6_rt_hdr *)CMSG_DATA(cmsg);
763 switch (rthdr->type) {
764 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
765 case IPV6_SRCRT_TYPE_2:
766 if (rthdr->hdrlen != 2 ||
767 rthdr->segments_left != 1) {
778 len = ((rthdr->hdrlen + 1) << 3);
780 if (cmsg->cmsg_len < CMSG_LEN(len)) {
785 /* segments left must also match */
786 if ((rthdr->hdrlen >> 1) != rthdr->segments_left) {
791 opt->opt_nflen += len;
794 if (cmsg->cmsg_type == IPV6_2292RTHDR && opt->dst1opt) {
795 int dsthdrlen = ((opt->dst1opt->hdrlen+1)<<3);
797 opt->opt_nflen += dsthdrlen;
798 opt->dst0opt = opt->dst1opt;
800 opt->opt_flen -= dsthdrlen;
805 case IPV6_2292HOPLIMIT:
807 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
812 *hlimit = *(int *)CMSG_DATA(cmsg);
813 if (*hlimit < -1 || *hlimit > 0xff) {
825 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
829 tc = *(int *)CMSG_DATA(cmsg);
830 if (tc < -1 || tc > 0xff)
844 if (cmsg->cmsg_len != CMSG_LEN(sizeof(int))) {
848 df = *(int *)CMSG_DATA(cmsg);
849 if (df < 0 || df > 1)
858 LIMIT_NETDEBUG(KERN_DEBUG "invalid cmsg type: %d\n",