1 // SPDX-License-Identifier: GPL-2.0-or-later
4 * Linux INET6 implementation
7 * Pedro Roque <roque@di.fc.ul.pt>
9 * Adapted from linux/net/ipv4/raw.c
12 * Hideaki YOSHIFUJI : sin6_scope_id support
13 * YOSHIFUJI,H.@USAGI : raw checksum (RFC2292(bis) compliance)
14 * Kazunori MIYAZAWA @USAGI: change process style to use ip6_append_data
17 #include <linux/errno.h>
18 #include <linux/types.h>
19 #include <linux/socket.h>
20 #include <linux/slab.h>
21 #include <linux/sockios.h>
22 #include <linux/net.h>
23 #include <linux/in6.h>
24 #include <linux/netdevice.h>
25 #include <linux/if_arp.h>
26 #include <linux/icmpv6.h>
27 #include <linux/netfilter.h>
28 #include <linux/netfilter_ipv6.h>
29 #include <linux/skbuff.h>
30 #include <linux/compat.h>
31 #include <linux/uaccess.h>
32 #include <asm/ioctls.h>
34 #include <net/net_namespace.h>
40 #include <net/ndisc.h>
41 #include <net/protocol.h>
42 #include <net/ip6_route.h>
43 #include <net/ip6_checksum.h>
44 #include <net/addrconf.h>
45 #include <net/transp_v6.h>
47 #include <net/inet_common.h>
48 #include <net/tcp_states.h>
49 #if IS_ENABLED(CONFIG_IPV6_MIP6)
52 #include <linux/mroute6.h>
55 #include <net/rawv6.h>
58 #include <linux/proc_fs.h>
59 #include <linux/seq_file.h>
60 #include <linux/export.h>
62 #define ICMPV6_HDRLEN 4 /* ICMPv6 header, RFC 4443 Section 2.1 */
64 struct raw_hashinfo raw_v6_hashinfo;
65 EXPORT_SYMBOL_GPL(raw_v6_hashinfo);
67 bool raw_v6_match(struct net *net, struct sock *sk, unsigned short num,
68 const struct in6_addr *loc_addr,
69 const struct in6_addr *rmt_addr, int dif, int sdif)
71 if (inet_sk(sk)->inet_num != num ||
72 !net_eq(sock_net(sk), net) ||
73 (!ipv6_addr_any(&sk->sk_v6_daddr) &&
74 !ipv6_addr_equal(&sk->sk_v6_daddr, rmt_addr)) ||
75 !raw_sk_bound_dev_eq(net, sk->sk_bound_dev_if,
79 if (ipv6_addr_any(&sk->sk_v6_rcv_saddr) ||
80 ipv6_addr_equal(&sk->sk_v6_rcv_saddr, loc_addr) ||
81 (ipv6_addr_is_multicast(loc_addr) &&
82 inet6_mc_check(sk, loc_addr, rmt_addr)))
87 EXPORT_SYMBOL_GPL(raw_v6_match);
93 static int icmpv6_filter(const struct sock *sk, const struct sk_buff *skb)
96 const struct icmp6hdr *hdr;
98 /* We require only the four bytes of the ICMPv6 header, not any
99 * additional bytes of message body in "struct icmp6hdr".
101 hdr = skb_header_pointer(skb, skb_transport_offset(skb),
102 ICMPV6_HDRLEN, &_hdr);
104 const __u32 *data = &raw6_sk(sk)->filter.data[0];
105 unsigned int type = hdr->icmp6_type;
107 return (data[type >> 5] & (1U << (type & 31))) != 0;
112 #if IS_ENABLED(CONFIG_IPV6_MIP6)
113 typedef int mh_filter_t(struct sock *sock, struct sk_buff *skb);
115 static mh_filter_t __rcu *mh_filter __read_mostly;
117 int rawv6_mh_filter_register(mh_filter_t filter)
119 rcu_assign_pointer(mh_filter, filter);
122 EXPORT_SYMBOL(rawv6_mh_filter_register);
124 int rawv6_mh_filter_unregister(mh_filter_t filter)
126 RCU_INIT_POINTER(mh_filter, NULL);
130 EXPORT_SYMBOL(rawv6_mh_filter_unregister);
135 * demultiplex raw sockets.
136 * (should consider queueing the skb in the sock receive_queue
137 * without calling rawv6.c)
139 * Caller owns SKB so we must make clones.
141 static bool ipv6_raw_deliver(struct sk_buff *skb, int nexthdr)
143 struct net *net = dev_net(skb->dev);
144 const struct in6_addr *saddr;
145 const struct in6_addr *daddr;
146 struct hlist_head *hlist;
148 bool delivered = false;
151 saddr = &ipv6_hdr(skb)->saddr;
154 hash = raw_hashfunc(net, nexthdr);
155 hlist = &raw_v6_hashinfo.ht[hash];
157 sk_for_each_rcu(sk, hlist) {
160 if (!raw_v6_match(net, sk, nexthdr, daddr, saddr,
161 inet6_iif(skb), inet6_sdif(skb)))
166 filtered = icmpv6_filter(sk, skb);
169 #if IS_ENABLED(CONFIG_IPV6_MIP6)
172 /* XXX: To validate MH only once for each packet,
173 * this is placed here. It should be after checking
174 * xfrm policy, however it doesn't. The checking xfrm
175 * policy is placed in rawv6_rcv() because it is
176 * required for each socket.
180 filter = rcu_dereference(mh_filter);
181 filtered = filter ? (*filter)(sk, skb) : 0;
193 struct sk_buff *clone = skb_clone(skb, GFP_ATOMIC);
195 /* Not releasing hash table! */
197 rawv6_rcv(sk, clone);
204 bool raw6_local_deliver(struct sk_buff *skb, int nexthdr)
206 return ipv6_raw_deliver(skb, nexthdr);
209 /* This cleans up af_inet6 a bit. -DaveM */
210 static int rawv6_bind(struct sock *sk, struct sockaddr *uaddr, int addr_len)
212 struct inet_sock *inet = inet_sk(sk);
213 struct ipv6_pinfo *np = inet6_sk(sk);
214 struct sockaddr_in6 *addr = (struct sockaddr_in6 *) uaddr;
219 if (addr_len < SIN6_LEN_RFC2133)
222 if (addr->sin6_family != AF_INET6)
225 addr_type = ipv6_addr_type(&addr->sin6_addr);
227 /* Raw sockets are IPv6 only */
228 if (addr_type == IPV6_ADDR_MAPPED)
229 return -EADDRNOTAVAIL;
234 if (sk->sk_state != TCP_CLOSE)
238 /* Check if the address belongs to the host. */
239 if (addr_type != IPV6_ADDR_ANY) {
240 struct net_device *dev = NULL;
242 if (__ipv6_addr_needs_scope_id(addr_type)) {
243 if (addr_len >= sizeof(struct sockaddr_in6) &&
244 addr->sin6_scope_id) {
245 /* Override any existing binding, if another
246 * one is supplied by user.
248 sk->sk_bound_dev_if = addr->sin6_scope_id;
251 /* Binding to link-local address requires an interface */
252 if (!sk->sk_bound_dev_if)
256 if (sk->sk_bound_dev_if) {
258 dev = dev_get_by_index_rcu(sock_net(sk),
259 sk->sk_bound_dev_if);
264 /* ipv4 addr of the socket is invalid. Only the
265 * unspecified and mapped address have a v4 equivalent.
267 v4addr = LOOPBACK4_IPV6;
268 if (!(addr_type & IPV6_ADDR_MULTICAST) &&
269 !ipv6_can_nonlocal_bind(sock_net(sk), inet)) {
270 err = -EADDRNOTAVAIL;
271 if (!ipv6_chk_addr(sock_net(sk), &addr->sin6_addr,
278 inet->inet_rcv_saddr = inet->inet_saddr = v4addr;
279 sk->sk_v6_rcv_saddr = addr->sin6_addr;
280 if (!(addr_type & IPV6_ADDR_MULTICAST))
281 np->saddr = addr->sin6_addr;
290 static void rawv6_err(struct sock *sk, struct sk_buff *skb,
291 struct inet6_skb_parm *opt,
292 u8 type, u8 code, int offset, __be32 info)
294 struct inet_sock *inet = inet_sk(sk);
295 struct ipv6_pinfo *np = inet6_sk(sk);
299 /* Report error on raw socket, if:
300 1. User requested recverr.
301 2. Socket is connected (otherwise the error indication
302 is useless without recverr and error is hard.
304 if (!np->recverr && sk->sk_state != TCP_ESTABLISHED)
307 harderr = icmpv6_err_convert(type, code, &err);
308 if (type == ICMPV6_PKT_TOOBIG) {
309 ip6_sk_update_pmtu(skb, sk, info);
310 harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
312 if (type == NDISC_REDIRECT) {
313 ip6_sk_redirect(skb, sk);
317 u8 *payload = skb->data;
320 ipv6_icmp_error(sk, skb, err, 0, ntohl(info), payload);
323 if (np->recverr || harderr) {
329 void raw6_icmp_error(struct sk_buff *skb, int nexthdr,
330 u8 type, u8 code, int inner_offset, __be32 info)
332 struct net *net = dev_net(skb->dev);
333 struct hlist_head *hlist;
337 hash = raw_hashfunc(net, nexthdr);
338 hlist = &raw_v6_hashinfo.ht[hash];
340 sk_for_each_rcu(sk, hlist) {
341 /* Note: ipv6_hdr(skb) != skb->data */
342 const struct ipv6hdr *ip6h = (const struct ipv6hdr *)skb->data;
344 if (!raw_v6_match(net, sk, nexthdr, &ip6h->saddr, &ip6h->daddr,
345 inet6_iif(skb), inet6_iif(skb)))
347 rawv6_err(sk, skb, NULL, type, code, inner_offset, info);
352 static inline int rawv6_rcv_skb(struct sock *sk, struct sk_buff *skb)
354 if ((raw6_sk(sk)->checksum || rcu_access_pointer(sk->sk_filter)) &&
355 skb_checksum_complete(skb)) {
356 atomic_inc(&sk->sk_drops);
361 /* Charge it to the socket. */
363 if (sock_queue_rcv_skb(sk, skb) < 0) {
372 * This is next to useless...
373 * if we demultiplex in network layer we don't need the extra call
374 * just to queue the skb...
375 * maybe we could have the network decide upon a hint if it
376 * should call raw_rcv for demultiplexing
378 int rawv6_rcv(struct sock *sk, struct sk_buff *skb)
380 struct inet_sock *inet = inet_sk(sk);
381 struct raw6_sock *rp = raw6_sk(sk);
383 if (!xfrm6_policy_check(sk, XFRM_POLICY_IN, skb)) {
384 atomic_inc(&sk->sk_drops);
391 skb->ip_summed = CHECKSUM_UNNECESSARY;
393 if (skb->ip_summed == CHECKSUM_COMPLETE) {
394 skb_postpull_rcsum(skb, skb_network_header(skb),
395 skb_network_header_len(skb));
396 if (!csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
397 &ipv6_hdr(skb)->daddr,
398 skb->len, inet->inet_num, skb->csum))
399 skb->ip_summed = CHECKSUM_UNNECESSARY;
401 if (!skb_csum_unnecessary(skb))
402 skb->csum = ~csum_unfold(csum_ipv6_magic(&ipv6_hdr(skb)->saddr,
403 &ipv6_hdr(skb)->daddr,
408 if (skb_checksum_complete(skb)) {
409 atomic_inc(&sk->sk_drops);
415 rawv6_rcv_skb(sk, skb);
421 * This should be easy, if there is something there
422 * we return it, otherwise we block.
425 static int rawv6_recvmsg(struct sock *sk, struct msghdr *msg, size_t len,
426 int flags, int *addr_len)
428 struct ipv6_pinfo *np = inet6_sk(sk);
429 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
437 if (flags & MSG_ERRQUEUE)
438 return ipv6_recv_error(sk, msg, len, addr_len);
440 if (np->rxpmtu && np->rxopt.bits.rxpmtu)
441 return ipv6_recv_rxpmtu(sk, msg, len, addr_len);
443 skb = skb_recv_datagram(sk, flags, &err);
450 msg->msg_flags |= MSG_TRUNC;
453 if (skb_csum_unnecessary(skb)) {
454 err = skb_copy_datagram_msg(skb, 0, msg, copied);
455 } else if (msg->msg_flags&MSG_TRUNC) {
456 if (__skb_checksum_complete(skb))
458 err = skb_copy_datagram_msg(skb, 0, msg, copied);
460 err = skb_copy_and_csum_datagram_msg(skb, 0, msg);
467 /* Copy the address. */
469 sin6->sin6_family = AF_INET6;
471 sin6->sin6_addr = ipv6_hdr(skb)->saddr;
472 sin6->sin6_flowinfo = 0;
473 sin6->sin6_scope_id = ipv6_iface_scope_id(&sin6->sin6_addr,
475 *addr_len = sizeof(*sin6);
478 sock_recv_cmsgs(msg, sk, skb);
481 ip6_datagram_recv_ctl(sk, msg, skb);
484 if (flags & MSG_TRUNC)
488 skb_free_datagram(sk, skb);
493 skb_kill_datagram(sk, skb, flags);
495 /* Error for blocking case is chosen to masquerade
496 as some normal condition.
498 err = (flags&MSG_DONTWAIT) ? -EAGAIN : -EHOSTUNREACH;
502 static int rawv6_push_pending_frames(struct sock *sk, struct flowi6 *fl6,
503 struct raw6_sock *rp)
505 struct ipv6_txoptions *opt;
517 skb = skb_peek(&sk->sk_write_queue);
522 total_len = inet_sk(sk)->cork.base.length;
523 opt = inet6_sk(sk)->cork.opt;
524 total_len -= opt ? opt->opt_flen : 0;
526 if (offset >= total_len - 1) {
528 ip6_flush_pending_frames(sk);
532 /* should be check HW csum miyazawa */
533 if (skb_queue_len(&sk->sk_write_queue) == 1) {
535 * Only one fragment on the socket.
537 tmp_csum = skb->csum;
539 struct sk_buff *csum_skb = NULL;
542 skb_queue_walk(&sk->sk_write_queue, skb) {
543 tmp_csum = csum_add(tmp_csum, skb->csum);
548 len = skb->len - skb_transport_offset(skb);
560 offset += skb_transport_offset(skb);
561 err = skb_copy_bits(skb, offset, &csum, 2);
563 ip6_flush_pending_frames(sk);
567 /* in case cksum was not initialized */
569 tmp_csum = csum_sub(tmp_csum, csum_unfold(csum));
571 csum = csum_ipv6_magic(&fl6->saddr, &fl6->daddr,
572 total_len, fl6->flowi6_proto, tmp_csum);
574 if (csum == 0 && fl6->flowi6_proto == IPPROTO_UDP)
575 csum = CSUM_MANGLED_0;
577 BUG_ON(skb_store_bits(skb, offset, &csum, 2));
580 err = ip6_push_pending_frames(sk);
585 static int rawv6_send_hdrinc(struct sock *sk, struct msghdr *msg, int length,
586 struct flowi6 *fl6, struct dst_entry **dstp,
587 unsigned int flags, const struct sockcm_cookie *sockc)
589 struct ipv6_pinfo *np = inet6_sk(sk);
590 struct net *net = sock_net(sk);
594 struct rt6_info *rt = (struct rt6_info *)*dstp;
595 int hlen = LL_RESERVED_SPACE(rt->dst.dev);
596 int tlen = rt->dst.dev->needed_tailroom;
598 if (length > rt->dst.dev->mtu) {
599 ipv6_local_error(sk, EMSGSIZE, fl6, rt->dst.dev->mtu);
602 if (length < sizeof(struct ipv6hdr))
607 skb = sock_alloc_send_skb(sk,
608 length + hlen + tlen + 15,
609 flags & MSG_DONTWAIT, &err);
612 skb_reserve(skb, hlen);
614 skb->protocol = htons(ETH_P_IPV6);
615 skb->priority = READ_ONCE(sk->sk_priority);
616 skb->mark = sockc->mark;
617 skb->tstamp = sockc->transmit_time;
619 skb_put(skb, length);
620 skb_reset_network_header(skb);
623 skb->ip_summed = CHECKSUM_NONE;
625 skb_setup_tx_timestamp(skb, sockc->tsflags);
627 if (flags & MSG_CONFIRM)
628 skb_set_dst_pending_confirm(skb, 1);
630 skb->transport_header = skb->network_header;
631 err = memcpy_from_msg(iph, msg, length);
638 skb_dst_set(skb, &rt->dst);
641 /* if egress device is enslaved to an L3 master device pass the
642 * skb to its handler for processing
644 skb = l3mdev_ip6_out(sk, skb);
648 /* Acquire rcu_read_lock() in case we need to use rt->rt6i_idev
649 * in the error path. Since skb has been freed, the dst could
650 * have been queued for deletion.
653 IP6_UPD_PO_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUT, skb->len);
654 err = NF_HOOK(NFPROTO_IPV6, NF_INET_LOCAL_OUT, net, sk, skb,
655 NULL, rt->dst.dev, dst_output);
657 err = net_xmit_errno(err);
659 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
668 IP6_INC_STATS(net, rt->rt6i_idev, IPSTATS_MIB_OUTDISCARDS);
670 if (err == -ENOBUFS && !np->recverr)
675 struct raw6_frag_vec {
681 static int rawv6_probe_proto_opt(struct raw6_frag_vec *rfv, struct flowi6 *fl6)
684 switch (fl6->flowi6_proto) {
687 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
689 fl6->fl6_icmp_type = rfv->c[0];
690 fl6->fl6_icmp_code = rfv->c[1];
695 err = memcpy_from_msg(rfv->c, rfv->msg, rfv->hlen);
697 fl6->fl6_mh_type = rfv->c[2];
702 static int raw6_getfrag(void *from, char *to, int offset, int len, int odd,
705 struct raw6_frag_vec *rfv = from;
707 if (offset < rfv->hlen) {
708 int copy = min(rfv->hlen - offset, len);
710 if (skb->ip_summed == CHECKSUM_PARTIAL)
711 memcpy(to, rfv->c + offset, copy);
713 skb->csum = csum_block_add(
715 csum_partial_copy_nocheck(rfv->c + offset,
730 return ip_generic_getfrag(rfv->msg, to, offset, len, odd, skb);
733 static int rawv6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
735 struct ipv6_txoptions *opt_to_free = NULL;
736 struct ipv6_txoptions opt_space;
737 DECLARE_SOCKADDR(struct sockaddr_in6 *, sin6, msg->msg_name);
738 struct in6_addr *daddr, *final_p, final;
739 struct inet_sock *inet = inet_sk(sk);
740 struct ipv6_pinfo *np = inet6_sk(sk);
741 struct raw6_sock *rp = raw6_sk(sk);
742 struct ipv6_txoptions *opt = NULL;
743 struct ip6_flowlabel *flowlabel = NULL;
744 struct dst_entry *dst = NULL;
745 struct raw6_frag_vec rfv;
747 struct ipcm6_cookie ipc6;
748 int addr_len = msg->msg_namelen;
753 /* Rough check on arithmetic overflow,
754 better check is made in ip6_append_data().
759 /* Mirror BSD error message compatibility */
760 if (msg->msg_flags & MSG_OOB)
763 /* hdrincl should be READ_ONCE(inet->hdrincl)
764 * but READ_ONCE() doesn't work with bit fields.
765 * Doing this indirectly yields the same result.
767 hdrincl = inet->hdrincl;
768 hdrincl = READ_ONCE(hdrincl);
771 * Get and verify the address.
773 memset(&fl6, 0, sizeof(fl6));
775 fl6.flowi6_mark = READ_ONCE(sk->sk_mark);
776 fl6.flowi6_uid = sk->sk_uid;
779 ipc6.sockc.tsflags = READ_ONCE(sk->sk_tsflags);
780 ipc6.sockc.mark = fl6.flowi6_mark;
783 if (addr_len < SIN6_LEN_RFC2133)
786 if (sin6->sin6_family && sin6->sin6_family != AF_INET6)
787 return -EAFNOSUPPORT;
789 /* port is the proto value [0..255] carried in nexthdr */
790 proto = ntohs(sin6->sin6_port);
793 proto = inet->inet_num;
794 else if (proto != inet->inet_num &&
795 inet->inet_num != IPPROTO_RAW)
801 daddr = &sin6->sin6_addr;
803 fl6.flowlabel = sin6->sin6_flowinfo&IPV6_FLOWINFO_MASK;
804 if (fl6.flowlabel&IPV6_FLOWLABEL_MASK) {
805 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
806 if (IS_ERR(flowlabel))
812 * Otherwise it will be difficult to maintain
815 if (sk->sk_state == TCP_ESTABLISHED &&
816 ipv6_addr_equal(daddr, &sk->sk_v6_daddr))
817 daddr = &sk->sk_v6_daddr;
819 if (addr_len >= sizeof(struct sockaddr_in6) &&
820 sin6->sin6_scope_id &&
821 __ipv6_addr_needs_scope_id(__ipv6_addr_type(daddr)))
822 fl6.flowi6_oif = sin6->sin6_scope_id;
824 if (sk->sk_state != TCP_ESTABLISHED)
825 return -EDESTADDRREQ;
827 proto = inet->inet_num;
828 daddr = &sk->sk_v6_daddr;
829 fl6.flowlabel = np->flow_label;
832 if (fl6.flowi6_oif == 0)
833 fl6.flowi6_oif = sk->sk_bound_dev_if;
835 if (msg->msg_controllen) {
837 memset(opt, 0, sizeof(struct ipv6_txoptions));
838 opt->tot_len = sizeof(struct ipv6_txoptions);
841 err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
843 fl6_sock_release(flowlabel);
846 if ((fl6.flowlabel&IPV6_FLOWLABEL_MASK) && !flowlabel) {
847 flowlabel = fl6_sock_lookup(sk, fl6.flowlabel);
848 if (IS_ERR(flowlabel))
851 if (!(opt->opt_nflen|opt->opt_flen))
859 opt = fl6_merge_options(&opt_space, flowlabel, opt);
860 opt = ipv6_fixup_options(&opt_space, opt);
862 fl6.flowi6_proto = proto;
863 fl6.flowi6_mark = ipc6.sockc.mark;
868 err = rawv6_probe_proto_opt(&rfv, &fl6);
873 if (!ipv6_addr_any(daddr))
876 fl6.daddr.s6_addr[15] = 0x1; /* :: means loopback (BSD'ism) */
877 if (ipv6_addr_any(&fl6.saddr) && !ipv6_addr_any(&np->saddr))
878 fl6.saddr = np->saddr;
880 final_p = fl6_update_dst(&fl6, opt, &final);
882 if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
883 fl6.flowi6_oif = np->mcast_oif;
884 else if (!fl6.flowi6_oif)
885 fl6.flowi6_oif = np->ucast_oif;
886 security_sk_classify_flow(sk, flowi6_to_flowi_common(&fl6));
889 fl6.flowi6_flags |= FLOWI_FLAG_KNOWN_NH;
892 ipc6.tclass = np->tclass;
894 fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
896 dst = ip6_dst_lookup_flow(sock_net(sk), sk, &fl6, final_p);
902 ipc6.hlimit = ip6_sk_dst_hoplimit(np, &fl6, dst);
904 if (ipc6.dontfrag < 0)
905 ipc6.dontfrag = np->dontfrag;
907 if (msg->msg_flags&MSG_CONFIRM)
912 err = rawv6_send_hdrinc(sk, msg, len, &fl6, &dst,
913 msg->msg_flags, &ipc6.sockc);
917 err = ip6_append_data(sk, raw6_getfrag, &rfv,
918 len, 0, &ipc6, &fl6, (struct rt6_info *)dst,
922 ip6_flush_pending_frames(sk);
923 else if (!(msg->msg_flags & MSG_MORE))
924 err = rawv6_push_pending_frames(sk, &fl6, rp);
930 fl6_sock_release(flowlabel);
931 txopt_put(opt_to_free);
932 return err < 0 ? err : len;
934 if (msg->msg_flags & MSG_PROBE)
935 dst_confirm_neigh(dst, &fl6.daddr);
936 if (!(msg->msg_flags & MSG_PROBE) || len)
937 goto back_from_confirm;
942 static int rawv6_seticmpfilter(struct sock *sk, int level, int optname,
943 sockptr_t optval, int optlen)
947 if (optlen > sizeof(struct icmp6_filter))
948 optlen = sizeof(struct icmp6_filter);
949 if (copy_from_sockptr(&raw6_sk(sk)->filter, optval, optlen))
959 static int rawv6_geticmpfilter(struct sock *sk, int level, int optname,
960 char __user *optval, int __user *optlen)
966 if (get_user(len, optlen))
970 if (len > sizeof(struct icmp6_filter))
971 len = sizeof(struct icmp6_filter);
972 if (put_user(len, optlen))
974 if (copy_to_user(optval, &raw6_sk(sk)->filter, len))
985 static int do_rawv6_setsockopt(struct sock *sk, int level, int optname,
986 sockptr_t optval, unsigned int optlen)
988 struct raw6_sock *rp = raw6_sk(sk);
991 if (optlen < sizeof(val))
994 if (copy_from_sockptr(&val, optval, sizeof(val)))
999 if (sk->sk_type != SOCK_RAW)
1001 inet_sk(sk)->hdrincl = !!val;
1004 if (inet_sk(sk)->inet_num == IPPROTO_ICMPV6 &&
1005 level == IPPROTO_IPV6) {
1007 * RFC3542 tells that IPV6_CHECKSUM socket
1008 * option in the IPPROTO_IPV6 level is not
1009 * allowed on ICMPv6 sockets.
1010 * If you want to set it, use IPPROTO_RAW
1011 * level IPV6_CHECKSUM socket option
1012 * (Linux extension).
1017 /* You may get strange result with a positive odd offset;
1018 RFC2292bis agrees with me. */
1019 if (val > 0 && (val&1))
1031 return -ENOPROTOOPT;
1035 static int rawv6_setsockopt(struct sock *sk, int level, int optname,
1036 sockptr_t optval, unsigned int optlen)
1043 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1045 return rawv6_seticmpfilter(sk, level, optname, optval, optlen);
1047 if (optname == IPV6_CHECKSUM ||
1048 optname == IPV6_HDRINCL)
1052 return ipv6_setsockopt(sk, level, optname, optval, optlen);
1055 return do_rawv6_setsockopt(sk, level, optname, optval, optlen);
1058 static int do_rawv6_getsockopt(struct sock *sk, int level, int optname,
1059 char __user *optval, int __user *optlen)
1061 struct raw6_sock *rp = raw6_sk(sk);
1064 if (get_user(len, optlen))
1069 val = inet_sk(sk)->hdrincl;
1073 * We allow getsockopt() for IPPROTO_IPV6-level
1074 * IPV6_CHECKSUM socket option on ICMPv6 sockets
1075 * since RFC3542 is silent about it.
1077 if (rp->checksum == 0)
1084 return -ENOPROTOOPT;
1087 len = min_t(unsigned int, sizeof(int), len);
1089 if (put_user(len, optlen))
1091 if (copy_to_user(optval, &val, len))
1096 static int rawv6_getsockopt(struct sock *sk, int level, int optname,
1097 char __user *optval, int __user *optlen)
1104 if (inet_sk(sk)->inet_num != IPPROTO_ICMPV6)
1106 return rawv6_geticmpfilter(sk, level, optname, optval, optlen);
1108 if (optname == IPV6_CHECKSUM ||
1109 optname == IPV6_HDRINCL)
1113 return ipv6_getsockopt(sk, level, optname, optval, optlen);
1116 return do_rawv6_getsockopt(sk, level, optname, optval, optlen);
1119 static int rawv6_ioctl(struct sock *sk, int cmd, unsigned long arg)
1123 int amount = sk_wmem_alloc_get(sk);
1125 return put_user(amount, (int __user *)arg);
1128 struct sk_buff *skb;
1131 spin_lock_bh(&sk->sk_receive_queue.lock);
1132 skb = skb_peek(&sk->sk_receive_queue);
1135 spin_unlock_bh(&sk->sk_receive_queue.lock);
1136 return put_user(amount, (int __user *)arg);
1140 #ifdef CONFIG_IPV6_MROUTE
1141 return ip6mr_ioctl(sk, cmd, (void __user *)arg);
1143 return -ENOIOCTLCMD;
1148 #ifdef CONFIG_COMPAT
1149 static int compat_rawv6_ioctl(struct sock *sk, unsigned int cmd, unsigned long arg)
1154 return -ENOIOCTLCMD;
1156 #ifdef CONFIG_IPV6_MROUTE
1157 return ip6mr_compat_ioctl(sk, cmd, compat_ptr(arg));
1159 return -ENOIOCTLCMD;
1165 static void rawv6_close(struct sock *sk, long timeout)
1167 if (inet_sk(sk)->inet_num == IPPROTO_RAW)
1168 ip6_ra_control(sk, -1);
1170 sk_common_release(sk);
1173 static void raw6_destroy(struct sock *sk)
1176 ip6_flush_pending_frames(sk);
1180 static int rawv6_init_sk(struct sock *sk)
1182 struct raw6_sock *rp = raw6_sk(sk);
1184 switch (inet_sk(sk)->inet_num) {
1185 case IPPROTO_ICMPV6:
1199 struct proto rawv6_prot = {
1201 .owner = THIS_MODULE,
1202 .close = rawv6_close,
1203 .destroy = raw6_destroy,
1204 .connect = ip6_datagram_connect_v6_only,
1205 .disconnect = __udp_disconnect,
1206 .ioctl = rawv6_ioctl,
1207 .init = rawv6_init_sk,
1208 .setsockopt = rawv6_setsockopt,
1209 .getsockopt = rawv6_getsockopt,
1210 .sendmsg = rawv6_sendmsg,
1211 .recvmsg = rawv6_recvmsg,
1213 .backlog_rcv = rawv6_rcv_skb,
1214 .hash = raw_hash_sk,
1215 .unhash = raw_unhash_sk,
1216 .obj_size = sizeof(struct raw6_sock),
1217 .useroffset = offsetof(struct raw6_sock, filter),
1218 .usersize = sizeof_field(struct raw6_sock, filter),
1219 .h.raw_hash = &raw_v6_hashinfo,
1220 #ifdef CONFIG_COMPAT
1221 .compat_ioctl = compat_rawv6_ioctl,
1223 .diag_destroy = raw_abort,
1226 #ifdef CONFIG_PROC_FS
1227 static int raw6_seq_show(struct seq_file *seq, void *v)
1229 if (v == SEQ_START_TOKEN) {
1230 seq_puts(seq, IPV6_SEQ_DGRAM_HEADER);
1232 struct sock *sp = v;
1233 __u16 srcp = inet_sk(sp)->inet_num;
1234 ip6_dgram_sock_seq_show(seq, v, srcp, 0,
1235 raw_seq_private(seq)->bucket);
1240 static const struct seq_operations raw6_seq_ops = {
1241 .start = raw_seq_start,
1242 .next = raw_seq_next,
1243 .stop = raw_seq_stop,
1244 .show = raw6_seq_show,
1247 static int __net_init raw6_init_net(struct net *net)
1249 if (!proc_create_net_data("raw6", 0444, net->proc_net, &raw6_seq_ops,
1250 sizeof(struct raw_iter_state), &raw_v6_hashinfo))
1256 static void __net_exit raw6_exit_net(struct net *net)
1258 remove_proc_entry("raw6", net->proc_net);
1261 static struct pernet_operations raw6_net_ops = {
1262 .init = raw6_init_net,
1263 .exit = raw6_exit_net,
1266 int __init raw6_proc_init(void)
1268 return register_pernet_subsys(&raw6_net_ops);
1271 void raw6_proc_exit(void)
1273 unregister_pernet_subsys(&raw6_net_ops);
1275 #endif /* CONFIG_PROC_FS */
1277 /* Same as inet6_dgram_ops, sans udp_poll. */
1278 const struct proto_ops inet6_sockraw_ops = {
1280 .owner = THIS_MODULE,
1281 .release = inet6_release,
1283 .connect = inet_dgram_connect, /* ok */
1284 .socketpair = sock_no_socketpair, /* a do nothing */
1285 .accept = sock_no_accept, /* a do nothing */
1286 .getname = inet6_getname,
1287 .poll = datagram_poll, /* ok */
1288 .ioctl = inet6_ioctl, /* must change */
1289 .gettstamp = sock_gettstamp,
1290 .listen = sock_no_listen, /* ok */
1291 .shutdown = inet_shutdown, /* ok */
1292 .setsockopt = sock_common_setsockopt, /* ok */
1293 .getsockopt = sock_common_getsockopt, /* ok */
1294 .sendmsg = inet_sendmsg, /* ok */
1295 .recvmsg = sock_common_recvmsg, /* ok */
1296 .mmap = sock_no_mmap,
1297 .sendpage = sock_no_sendpage,
1298 #ifdef CONFIG_COMPAT
1299 .compat_ioctl = inet6_compat_ioctl,
1303 static struct inet_protosw rawv6_protosw = {
1305 .protocol = IPPROTO_IP, /* wild card */
1306 .prot = &rawv6_prot,
1307 .ops = &inet6_sockraw_ops,
1308 .flags = INET_PROTOSW_REUSE,
1311 int __init rawv6_init(void)
1313 return inet6_register_protosw(&rawv6_protosw);
1316 void rawv6_exit(void)
1318 inet6_unregister_protosw(&rawv6_protosw);