1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* SCTP kernel implementation
3 * (C) Copyright IBM Corp. 2002, 2004
4 * Copyright (c) 2001 Nokia, Inc.
5 * Copyright (c) 2001 La Monte H.P. Yarroll
6 * Copyright (c) 2002-2003 Intel Corp.
8 * This file is part of the SCTP kernel implementation
12 * Please send any bug reports or fixes you make to the
14 * lksctp developers <linux-sctp@vger.kernel.org>
16 * Written or modified by:
17 * Le Yanqun <yanqun.le@nokia.com>
18 * Hui Huang <hui.huang@nokia.com>
19 * La Monte H.P. Yarroll <piggy@acm.org>
20 * Sridhar Samudrala <sri@us.ibm.com>
21 * Jon Grimm <jgrimm@us.ibm.com>
22 * Ardelle Fan <ardelle.fan@intel.com>
25 * linux/net/ipv6/tcp_ipv6.c
28 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
30 #include <linux/module.h>
31 #include <linux/errno.h>
32 #include <linux/types.h>
33 #include <linux/socket.h>
34 #include <linux/sockios.h>
35 #include <linux/net.h>
37 #include <linux/in6.h>
38 #include <linux/netdevice.h>
39 #include <linux/init.h>
40 #include <linux/ipsec.h>
41 #include <linux/slab.h>
43 #include <linux/ipv6.h>
44 #include <linux/icmpv6.h>
45 #include <linux/random.h>
46 #include <linux/seq_file.h>
48 #include <net/protocol.h>
49 #include <net/ndisc.h>
52 #include <net/transp_v6.h>
53 #include <net/addrconf.h>
54 #include <net/ip6_route.h>
55 #include <net/inet_common.h>
56 #include <net/inet_ecn.h>
57 #include <net/sctp/sctp.h>
58 #include <net/udp_tunnel.h>
60 #include <linux/uaccess.h>
62 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
64 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
66 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
67 const union sctp_addr *addr2);
69 /* Event handler for inet6 address addition/deletion events.
70 * The sctp_local_addr_list needs to be protocted by a spin lock since
71 * multiple notifiers (say IPv4 and IPv6) may be running at the same
72 * time and thus corrupt the list.
73 * The reader side is protected with RCU.
75 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
78 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
79 struct sctp_sockaddr_entry *addr = NULL;
80 struct sctp_sockaddr_entry *temp;
81 struct net *net = dev_net(ifa->idev->dev);
86 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
88 addr->a.v6.sin6_family = AF_INET6;
89 addr->a.v6.sin6_addr = ifa->addr;
90 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
92 spin_lock_bh(&net->sctp.local_addr_lock);
93 list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list);
94 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW);
95 spin_unlock_bh(&net->sctp.local_addr_lock);
99 spin_lock_bh(&net->sctp.local_addr_lock);
100 list_for_each_entry_safe(addr, temp,
101 &net->sctp.local_addr_list, list) {
102 if (addr->a.sa.sa_family == AF_INET6 &&
103 ipv6_addr_equal(&addr->a.v6.sin6_addr,
105 sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL);
108 list_del_rcu(&addr->list);
112 spin_unlock_bh(&net->sctp.local_addr_lock);
114 kfree_rcu(addr, rcu);
121 static struct notifier_block sctp_inet6addr_notifier = {
122 .notifier_call = sctp_inet6addr_event,
125 static void sctp_v6_err_handle(struct sctp_transport *t, struct sk_buff *skb,
126 __u8 type, __u8 code, __u32 info)
128 struct sctp_association *asoc = t->asoc;
129 struct sock *sk = asoc->base.sk;
130 struct ipv6_pinfo *np;
134 case ICMPV6_PKT_TOOBIG:
135 if (ip6_sk_accept_pmtu(sk))
136 sctp_icmp_frag_needed(sk, asoc, t, info);
138 case ICMPV6_PARAMPROB:
139 if (ICMPV6_UNK_NEXTHDR == code) {
140 sctp_icmp_proto_unreachable(sk, asoc, t);
145 sctp_icmp_redirect(sk, t, skb);
152 icmpv6_err_convert(type, code, &err);
153 if (!sock_owned_by_user(sk) && np->recverr) {
157 sk->sk_err_soft = err;
161 /* ICMP error handler. */
162 static int sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
163 u8 type, u8 code, int offset, __be32 info)
165 struct net *net = dev_net(skb->dev);
166 struct sctp_transport *transport;
167 struct sctp_association *asoc;
168 __u16 saveip, savesctp;
171 /* Fix up skb to look at the embedded net header. */
172 saveip = skb->network_header;
173 savesctp = skb->transport_header;
174 skb_reset_network_header(skb);
175 skb_set_transport_header(skb, offset);
176 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
177 /* Put back, the original pointers. */
178 skb->network_header = saveip;
179 skb->transport_header = savesctp;
181 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
185 sctp_v6_err_handle(transport, skb, type, code, ntohl(info));
186 sctp_err_finish(sk, transport);
191 int sctp_udp_v6_err(struct sock *sk, struct sk_buff *skb)
193 struct net *net = dev_net(skb->dev);
194 struct sctp_association *asoc;
195 struct sctp_transport *t;
196 struct icmp6hdr *hdr;
199 skb->transport_header += sizeof(struct udphdr);
200 sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &t);
202 __ICMP6_INC_STATS(net, __in6_dev_get(skb->dev), ICMP6_MIB_INERRORS);
206 skb->transport_header -= sizeof(struct udphdr);
207 hdr = (struct icmp6hdr *)(skb_network_header(skb) - sizeof(struct icmp6hdr));
208 if (hdr->icmp6_type == NDISC_REDIRECT) {
209 /* can't be handled without outer ip6hdr known, leave it to udpv6_err */
210 sctp_err_finish(sk, t);
213 if (hdr->icmp6_type == ICMPV6_PKT_TOOBIG)
214 info = ntohl(hdr->icmp6_mtu);
215 sctp_v6_err_handle(t, skb, hdr->icmp6_type, hdr->icmp6_code, info);
217 sctp_err_finish(sk, t);
221 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *t)
223 struct dst_entry *dst = dst_clone(t->dst);
224 struct flowi6 *fl6 = &t->fl.u.ip6;
225 struct sock *sk = skb->sk;
226 struct ipv6_pinfo *np = inet6_sk(sk);
227 __u8 tclass = np->tclass;
230 pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb,
231 skb->len, &fl6->saddr, &fl6->daddr);
233 if (t->dscp & SCTP_DSCP_SET_MASK)
234 tclass = t->dscp & SCTP_DSCP_VAL_MASK;
236 if (INET_ECN_is_capable(tclass))
237 IP6_ECN_flow_xmit(sk, fl6->flowlabel);
239 if (!(t->param_flags & SPP_PMTUD_ENABLE))
242 SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
244 if (!t->encap_port || !sctp_sk(sk)->udp_port) {
247 skb_dst_set(skb, dst);
249 res = ip6_xmit(sk, skb, fl6, sk->sk_mark,
250 rcu_dereference(np->opt),
251 tclass, sk->sk_priority);
257 skb_shinfo(skb)->gso_type |= SKB_GSO_UDP_TUNNEL_CSUM;
259 skb->encapsulation = 1;
260 skb_reset_inner_mac_header(skb);
261 skb_reset_inner_transport_header(skb);
262 skb_set_inner_ipproto(skb, IPPROTO_SCTP);
263 label = ip6_make_flowlabel(sock_net(sk), skb, fl6->flowlabel, true, fl6);
265 return udp_tunnel6_xmit_skb(dst, sk, skb, NULL, &fl6->saddr,
266 &fl6->daddr, tclass, ip6_dst_hoplimit(dst),
267 label, sctp_sk(sk)->udp_port, t->encap_port, false);
270 /* Returns the dst cache entry for the given source and destination ip
273 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
274 struct flowi *fl, struct sock *sk)
276 struct sctp_association *asoc = t->asoc;
277 struct dst_entry *dst = NULL;
279 struct flowi6 *fl6 = &_fl.u.ip6;
280 struct sctp_bind_addr *bp;
281 struct ipv6_pinfo *np = inet6_sk(sk);
282 struct sctp_sockaddr_entry *laddr;
283 union sctp_addr *daddr = &t->ipaddr;
284 union sctp_addr dst_saddr;
285 struct in6_addr *final_p, final;
286 enum sctp_scope scope;
289 memset(&_fl, 0, sizeof(_fl));
290 fl6->daddr = daddr->v6.sin6_addr;
291 fl6->fl6_dport = daddr->v6.sin6_port;
292 fl6->flowi6_proto = IPPROTO_SCTP;
293 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
294 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
296 fl6->flowi6_oif = asoc->base.sk->sk_bound_dev_if;
297 if (t->flowlabel & SCTP_FLOWLABEL_SET_MASK)
298 fl6->flowlabel = htonl(t->flowlabel & SCTP_FLOWLABEL_VAL_MASK);
300 if (np->sndflow && (fl6->flowlabel & IPV6_FLOWLABEL_MASK)) {
301 struct ip6_flowlabel *flowlabel;
303 flowlabel = fl6_sock_lookup(sk, fl6->flowlabel);
304 if (IS_ERR(flowlabel))
306 fl6_sock_release(flowlabel);
309 pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
312 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
315 fl6->saddr = saddr->v6.sin6_addr;
317 fl6->fl6_sport = saddr->v6.sin6_port;
319 pr_debug("src=%pI6 - ", &fl6->saddr);
323 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
326 dst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
327 if (!asoc || saddr) {
329 memcpy(fl, &_fl, sizeof(_fl));
333 bp = &asoc->base.bind_addr;
334 scope = sctp_scope(daddr);
335 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
336 * to see if we can use it.
339 /* Walk through the bind address list and look for a bind
340 * address that matches the source address of the returned dst.
342 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
344 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
345 if (!laddr->valid || laddr->state == SCTP_ADDR_DEL ||
346 (laddr->state != SCTP_ADDR_SRC &&
347 !asoc->src_out_of_asoc_ok))
350 /* Do not compare against v4 addrs */
351 if ((laddr->a.sa.sa_family == AF_INET6) &&
352 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
355 memcpy(fl, &_fl, sizeof(_fl));
360 /* None of the bound addresses match the source address of the
361 * dst. So release it.
367 /* Walk through the bind address list and try to get the
368 * best source address for a given destination.
371 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
372 struct dst_entry *bdst;
376 laddr->state != SCTP_ADDR_SRC ||
377 laddr->a.sa.sa_family != AF_INET6 ||
378 scope > sctp_scope(&laddr->a))
381 fl6->saddr = laddr->a.v6.sin6_addr;
382 fl6->fl6_sport = laddr->a.v6.sin6_port;
383 final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
384 bdst = ip6_dst_lookup_flow(sock_net(sk), sk, fl6, final_p);
389 if (ipv6_chk_addr(dev_net(bdst->dev),
390 &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
391 if (!IS_ERR_OR_NULL(dst))
395 memcpy(fl, &_fl, sizeof(_fl));
399 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
400 if (matchlen > bmatchlen) {
405 if (!IS_ERR_OR_NULL(dst))
408 matchlen = bmatchlen;
410 memcpy(fl, &_fl, sizeof(_fl));
415 if (!IS_ERR_OR_NULL(dst)) {
418 rt = (struct rt6_info *)dst;
419 t->dst_cookie = rt6_get_cookie(rt);
420 pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n",
421 &rt->rt6i_dst.addr, rt->rt6i_dst.plen,
425 pr_debug("no route\n");
429 /* Returns the number of consecutive initial bits that match in the 2 ipv6
432 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
435 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
438 /* Fills in the source address(saddr) based on the destination address(daddr)
439 * and asoc's bind address list.
441 static void sctp_v6_get_saddr(struct sctp_sock *sk,
442 struct sctp_transport *t,
445 struct flowi6 *fl6 = &fl->u.ip6;
446 union sctp_addr *saddr = &t->saddr;
448 pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
451 saddr->v6.sin6_family = AF_INET6;
452 saddr->v6.sin6_addr = fl6->saddr;
456 /* Make a copy of all potential local addresses. */
457 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
458 struct net_device *dev)
460 struct inet6_dev *in6_dev;
461 struct inet6_ifaddr *ifp;
462 struct sctp_sockaddr_entry *addr;
465 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
470 read_lock_bh(&in6_dev->lock);
471 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
472 /* Add the address to the local list. */
473 addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
475 addr->a.v6.sin6_family = AF_INET6;
476 addr->a.v6.sin6_addr = ifp->addr;
477 addr->a.v6.sin6_scope_id = dev->ifindex;
479 INIT_LIST_HEAD(&addr->list);
480 list_add_tail(&addr->list, addrlist);
484 read_unlock_bh(&in6_dev->lock);
488 /* Copy over any ip options */
489 static void sctp_v6_copy_ip_options(struct sock *sk, struct sock *newsk)
491 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
492 struct ipv6_txoptions *opt;
494 newnp = inet6_sk(newsk);
497 opt = rcu_dereference(np->opt);
499 opt = ipv6_dup_options(newsk, opt);
501 pr_err("%s: Failed to copy ip options\n", __func__);
503 RCU_INIT_POINTER(newnp->opt, opt);
507 /* Account for the IP options */
508 static int sctp_v6_ip_options_len(struct sock *sk)
510 struct ipv6_pinfo *np = inet6_sk(sk);
511 struct ipv6_txoptions *opt;
515 opt = rcu_dereference(np->opt);
517 len = opt->opt_flen + opt->opt_nflen;
523 /* Initialize a sockaddr_storage from in incoming skb. */
524 static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
527 /* Always called on head skb, so this is safe */
528 struct sctphdr *sh = sctp_hdr(skb);
529 struct sockaddr_in6 *sa = &addr->v6;
531 addr->v6.sin6_family = AF_INET6;
532 addr->v6.sin6_flowinfo = 0; /* FIXME */
533 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
536 sa->sin6_port = sh->source;
537 sa->sin6_addr = ipv6_hdr(skb)->saddr;
539 sa->sin6_port = sh->dest;
540 sa->sin6_addr = ipv6_hdr(skb)->daddr;
544 /* Initialize an sctp_addr from a socket. */
545 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
547 addr->v6.sin6_family = AF_INET6;
548 addr->v6.sin6_port = 0;
549 addr->v6.sin6_addr = sk->sk_v6_rcv_saddr;
552 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
553 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
555 if (addr->sa.sa_family == AF_INET) {
556 sk->sk_v6_rcv_saddr.s6_addr32[0] = 0;
557 sk->sk_v6_rcv_saddr.s6_addr32[1] = 0;
558 sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
559 sk->sk_v6_rcv_saddr.s6_addr32[3] =
560 addr->v4.sin_addr.s_addr;
562 sk->sk_v6_rcv_saddr = addr->v6.sin6_addr;
566 /* Initialize sk->sk_daddr from sctp_addr. */
567 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
569 if (addr->sa.sa_family == AF_INET) {
570 sk->sk_v6_daddr.s6_addr32[0] = 0;
571 sk->sk_v6_daddr.s6_addr32[1] = 0;
572 sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff);
573 sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
575 sk->sk_v6_daddr = addr->v6.sin6_addr;
579 /* Initialize a sctp_addr from an address parameter. */
580 static bool sctp_v6_from_addr_param(union sctp_addr *addr,
581 union sctp_addr_param *param,
582 __be16 port, int iif)
584 if (ntohs(param->v6.param_hdr.length) < sizeof(struct sctp_ipv6addr_param))
587 addr->v6.sin6_family = AF_INET6;
588 addr->v6.sin6_port = port;
589 addr->v6.sin6_flowinfo = 0; /* BUG */
590 addr->v6.sin6_addr = param->v6.addr;
591 addr->v6.sin6_scope_id = iif;
596 /* Initialize an address parameter from a sctp_addr and return the length
597 * of the address parameter.
599 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
600 union sctp_addr_param *param)
602 int length = sizeof(struct sctp_ipv6addr_param);
604 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
605 param->v6.param_hdr.length = htons(length);
606 param->v6.addr = addr->v6.sin6_addr;
611 /* Initialize a sctp_addr from struct in6_addr. */
612 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
615 addr->sa.sa_family = AF_INET6;
616 addr->v6.sin6_port = port;
617 addr->v6.sin6_flowinfo = 0;
618 addr->v6.sin6_addr = *saddr;
619 addr->v6.sin6_scope_id = 0;
622 static int __sctp_v6_cmp_addr(const union sctp_addr *addr1,
623 const union sctp_addr *addr2)
625 if (addr1->sa.sa_family != addr2->sa.sa_family) {
626 if (addr1->sa.sa_family == AF_INET &&
627 addr2->sa.sa_family == AF_INET6 &&
628 ipv6_addr_v4mapped(&addr2->v6.sin6_addr) &&
629 addr2->v6.sin6_addr.s6_addr32[3] ==
630 addr1->v4.sin_addr.s_addr)
633 if (addr2->sa.sa_family == AF_INET &&
634 addr1->sa.sa_family == AF_INET6 &&
635 ipv6_addr_v4mapped(&addr1->v6.sin6_addr) &&
636 addr1->v6.sin6_addr.s6_addr32[3] ==
637 addr2->v4.sin_addr.s_addr)
643 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
646 /* If this is a linklocal address, compare the scope_id. */
647 if ((ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) &&
648 addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
649 addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)
655 /* Compare addresses exactly.
656 * v4-mapped-v6 is also in consideration.
658 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
659 const union sctp_addr *addr2)
661 return __sctp_v6_cmp_addr(addr1, addr2) &&
662 addr1->v6.sin6_port == addr2->v6.sin6_port;
665 /* Initialize addr struct to INADDR_ANY. */
666 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
668 memset(addr, 0x00, sizeof(union sctp_addr));
669 addr->v6.sin6_family = AF_INET6;
670 addr->v6.sin6_port = port;
673 /* Is this a wildcard address? */
674 static int sctp_v6_is_any(const union sctp_addr *addr)
676 return ipv6_addr_any(&addr->v6.sin6_addr);
679 /* Should this be available for binding? */
680 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
683 struct net *net = sock_net(&sp->inet.sk);
684 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
686 type = ipv6_addr_type(in6);
687 if (IPV6_ADDR_ANY == type)
689 if (type == IPV6_ADDR_MAPPED) {
690 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
692 sctp_v6_map_v4(addr);
693 return sctp_get_af_specific(AF_INET)->available(addr, sp);
695 if (!(type & IPV6_ADDR_UNICAST))
698 return ipv6_can_nonlocal_bind(net, &sp->inet) ||
699 ipv6_chk_addr(net, in6, NULL, 0);
702 /* This function checks if the address is a valid address to be used for
706 * Return 0 - If the address is a non-unicast or an illegal address.
707 * Return 1 - If the address is a unicast.
709 static int sctp_v6_addr_valid(union sctp_addr *addr,
710 struct sctp_sock *sp,
711 const struct sk_buff *skb)
713 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
715 /* Support v4-mapped-v6 address. */
716 if (ret == IPV6_ADDR_MAPPED) {
717 /* Note: This routine is used in input, so v4-mapped-v6
718 * are disallowed here when there is no sctp_sock.
720 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
722 sctp_v6_map_v4(addr);
723 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
726 /* Is this a non-unicast address */
727 if (!(ret & IPV6_ADDR_UNICAST))
733 /* What is the scope of 'addr'? */
734 static enum sctp_scope sctp_v6_scope(union sctp_addr *addr)
736 enum sctp_scope retval;
739 /* The IPv6 scope is really a set of bit fields.
740 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
743 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
746 retval = SCTP_SCOPE_LOOPBACK;
749 retval = SCTP_SCOPE_LINK;
752 retval = SCTP_SCOPE_PRIVATE;
755 retval = SCTP_SCOPE_GLOBAL;
762 /* Create and initialize a new sk for the socket to be returned by accept(). */
763 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
764 struct sctp_association *asoc,
768 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
769 struct sctp6_sock *newsctp6sk;
771 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, kern);
775 sock_init_data(NULL, newsk);
777 sctp_copy_sock(newsk, sk, asoc);
778 sock_reset_flag(sk, SOCK_ZAPPED);
780 newsctp6sk = (struct sctp6_sock *)newsk;
781 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
783 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
785 newnp = inet6_sk(newsk);
787 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
788 newnp->ipv6_mc_list = NULL;
789 newnp->ipv6_ac_list = NULL;
790 newnp->ipv6_fl_list = NULL;
792 sctp_v6_copy_ip_options(sk, newsk);
794 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
797 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
799 newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr;
801 sk_refcnt_debug_inc(newsk);
803 if (newsk->sk_prot->init(newsk)) {
804 sk_common_release(newsk);
812 /* Format a sockaddr for return to user space. This makes sure the return is
813 * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option.
815 static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr)
818 if (addr->sa.sa_family == AF_INET)
819 sctp_v4_map_v6(addr);
821 if (addr->sa.sa_family == AF_INET6 &&
822 ipv6_addr_v4mapped(&addr->v6.sin6_addr))
823 sctp_v6_map_v4(addr);
826 if (addr->sa.sa_family == AF_INET) {
827 memset(addr->v4.sin_zero, 0, sizeof(addr->v4.sin_zero));
828 return sizeof(struct sockaddr_in);
830 return sizeof(struct sockaddr_in6);
833 /* Where did this skb come from? */
834 static int sctp_v6_skb_iif(const struct sk_buff *skb)
836 return IP6CB(skb)->iif;
839 /* Was this packet marked by Explicit Congestion Notification? */
840 static int sctp_v6_is_ce(const struct sk_buff *skb)
842 return *((__u32 *)(ipv6_hdr(skb))) & (__force __u32)htonl(1 << 20);
845 /* Dump the v6 addr to the seq file. */
846 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
848 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
851 static void sctp_v6_ecn_capable(struct sock *sk)
853 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
856 /* Initialize a PF_INET msgname from a ulpevent. */
857 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
858 char *msgname, int *addrlen)
860 union sctp_addr *addr;
861 struct sctp_association *asoc;
862 union sctp_addr *paddr;
867 addr = (union sctp_addr *)msgname;
869 paddr = &asoc->peer.primary_addr;
871 if (paddr->sa.sa_family == AF_INET) {
872 addr->v4.sin_family = AF_INET;
873 addr->v4.sin_port = htons(asoc->peer.port);
874 addr->v4.sin_addr = paddr->v4.sin_addr;
876 addr->v6.sin6_family = AF_INET6;
877 addr->v6.sin6_flowinfo = 0;
878 if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
879 addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id;
881 addr->v6.sin6_scope_id = 0;
882 addr->v6.sin6_port = htons(asoc->peer.port);
883 addr->v6.sin6_addr = paddr->v6.sin6_addr;
886 *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr);
889 /* Initialize a msg_name from an inbound skb. */
890 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
893 union sctp_addr *addr;
899 addr = (union sctp_addr *)msgname;
902 if (ip_hdr(skb)->version == 4) {
903 addr->v4.sin_family = AF_INET;
904 addr->v4.sin_port = sh->source;
905 addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr;
907 addr->v6.sin6_family = AF_INET6;
908 addr->v6.sin6_flowinfo = 0;
909 addr->v6.sin6_port = sh->source;
910 addr->v6.sin6_addr = ipv6_hdr(skb)->saddr;
911 if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
912 addr->v6.sin6_scope_id = sctp_v6_skb_iif(skb);
914 addr->v6.sin6_scope_id = 0;
917 *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
920 /* Do we support this AF? */
921 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
926 /* v4-mapped-v6 addresses */
928 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
936 /* Address matching with wildcards allowed. This extra level
937 * of indirection lets us choose whether a PF_INET6 should
938 * disallow any v4 addresses if we so choose.
940 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
941 const union sctp_addr *addr2,
942 struct sctp_sock *opt)
944 struct sock *sk = sctp_opt2sk(opt);
945 struct sctp_af *af1, *af2;
947 af1 = sctp_get_af_specific(addr1->sa.sa_family);
948 af2 = sctp_get_af_specific(addr2->sa.sa_family);
953 /* If the socket is IPv6 only, v4 addrs will not match */
954 if (__ipv6_only_sock(sk) && af1 != af2)
957 /* Today, wildcard AF_INET/AF_INET6. */
958 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
961 if (addr1->sa.sa_family == AF_INET && addr2->sa.sa_family == AF_INET)
962 return addr1->v4.sin_addr.s_addr == addr2->v4.sin_addr.s_addr;
964 return __sctp_v6_cmp_addr(addr1, addr2);
967 /* Verify that the provided sockaddr looks bindable. Common verification,
968 * has already been taken care of.
970 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
974 /* ASSERT: address family has already been verified. */
975 if (addr->sa.sa_family != AF_INET6)
976 af = sctp_get_af_specific(addr->sa.sa_family);
978 int type = ipv6_addr_type(&addr->v6.sin6_addr);
979 struct net_device *dev;
981 if (type & IPV6_ADDR_LINKLOCAL) {
983 if (!addr->v6.sin6_scope_id)
985 net = sock_net(&opt->inet.sk);
987 dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id);
988 if (!dev || !(ipv6_can_nonlocal_bind(net, &opt->inet) ||
989 ipv6_chk_addr(net, &addr->v6.sin6_addr,
999 return af->available(addr, opt);
1002 /* Verify that the provided sockaddr looks sendable. Common verification,
1003 * has already been taken care of.
1005 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
1007 struct sctp_af *af = NULL;
1009 /* ASSERT: address family has already been verified. */
1010 if (addr->sa.sa_family != AF_INET6)
1011 af = sctp_get_af_specific(addr->sa.sa_family);
1013 int type = ipv6_addr_type(&addr->v6.sin6_addr);
1014 struct net_device *dev;
1016 if (type & IPV6_ADDR_LINKLOCAL) {
1017 if (!addr->v6.sin6_scope_id)
1020 dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk),
1021 addr->v6.sin6_scope_id);
1032 /* Fill in Supported Address Type information for INIT and INIT-ACK
1033 * chunks. Note: In the future, we may want to look at sock options
1034 * to determine whether a PF_INET6 socket really wants to have IPV4
1036 * Returns number of addresses supported.
1038 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
1041 types[0] = SCTP_PARAM_IPV6_ADDRESS;
1042 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
1043 types[1] = SCTP_PARAM_IPV4_ADDRESS;
1049 /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */
1050 static int sctp_getname(struct socket *sock, struct sockaddr *uaddr,
1055 rc = inet6_getname(sock, uaddr, peer);
1060 rc = sctp_v6_addr_to_user(sctp_sk(sock->sk),
1061 (union sctp_addr *)uaddr);
1066 static const struct proto_ops inet6_seqpacket_ops = {
1068 .owner = THIS_MODULE,
1069 .release = inet6_release,
1071 .connect = sctp_inet_connect,
1072 .socketpair = sock_no_socketpair,
1073 .accept = inet_accept,
1074 .getname = sctp_getname,
1076 .ioctl = inet6_ioctl,
1077 .gettstamp = sock_gettstamp,
1078 .listen = sctp_inet_listen,
1079 .shutdown = inet_shutdown,
1080 .setsockopt = sock_common_setsockopt,
1081 .getsockopt = sock_common_getsockopt,
1082 .sendmsg = inet_sendmsg,
1083 .recvmsg = inet_recvmsg,
1084 .mmap = sock_no_mmap,
1085 #ifdef CONFIG_COMPAT
1086 .compat_ioctl = inet6_compat_ioctl,
1090 static struct inet_protosw sctpv6_seqpacket_protosw = {
1091 .type = SOCK_SEQPACKET,
1092 .protocol = IPPROTO_SCTP,
1093 .prot = &sctpv6_prot,
1094 .ops = &inet6_seqpacket_ops,
1095 .flags = SCTP_PROTOSW_FLAG
1097 static struct inet_protosw sctpv6_stream_protosw = {
1098 .type = SOCK_STREAM,
1099 .protocol = IPPROTO_SCTP,
1100 .prot = &sctpv6_prot,
1101 .ops = &inet6_seqpacket_ops,
1102 .flags = SCTP_PROTOSW_FLAG,
1105 static int sctp6_rcv(struct sk_buff *skb)
1107 SCTP_INPUT_CB(skb)->encap_port = 0;
1108 return sctp_rcv(skb) ? -1 : 0;
1111 static const struct inet6_protocol sctpv6_protocol = {
1112 .handler = sctp6_rcv,
1113 .err_handler = sctp_v6_err,
1114 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
1117 static struct sctp_af sctp_af_inet6 = {
1118 .sa_family = AF_INET6,
1119 .sctp_xmit = sctp_v6_xmit,
1120 .setsockopt = ipv6_setsockopt,
1121 .getsockopt = ipv6_getsockopt,
1122 .get_dst = sctp_v6_get_dst,
1123 .get_saddr = sctp_v6_get_saddr,
1124 .copy_addrlist = sctp_v6_copy_addrlist,
1125 .from_skb = sctp_v6_from_skb,
1126 .from_sk = sctp_v6_from_sk,
1127 .from_addr_param = sctp_v6_from_addr_param,
1128 .to_addr_param = sctp_v6_to_addr_param,
1129 .cmp_addr = sctp_v6_cmp_addr,
1130 .scope = sctp_v6_scope,
1131 .addr_valid = sctp_v6_addr_valid,
1132 .inaddr_any = sctp_v6_inaddr_any,
1133 .is_any = sctp_v6_is_any,
1134 .available = sctp_v6_available,
1135 .skb_iif = sctp_v6_skb_iif,
1136 .is_ce = sctp_v6_is_ce,
1137 .seq_dump_addr = sctp_v6_seq_dump_addr,
1138 .ecn_capable = sctp_v6_ecn_capable,
1139 .net_header_len = sizeof(struct ipv6hdr),
1140 .sockaddr_len = sizeof(struct sockaddr_in6),
1141 .ip_options_len = sctp_v6_ip_options_len,
1144 static struct sctp_pf sctp_pf_inet6 = {
1145 .event_msgname = sctp_inet6_event_msgname,
1146 .skb_msgname = sctp_inet6_skb_msgname,
1147 .af_supported = sctp_inet6_af_supported,
1148 .cmp_addr = sctp_inet6_cmp_addr,
1149 .bind_verify = sctp_inet6_bind_verify,
1150 .send_verify = sctp_inet6_send_verify,
1151 .supported_addrs = sctp_inet6_supported_addrs,
1152 .create_accept_sk = sctp_v6_create_accept_sk,
1153 .addr_to_user = sctp_v6_addr_to_user,
1154 .to_sk_saddr = sctp_v6_to_sk_saddr,
1155 .to_sk_daddr = sctp_v6_to_sk_daddr,
1156 .copy_ip_options = sctp_v6_copy_ip_options,
1157 .af = &sctp_af_inet6,
1160 /* Initialize IPv6 support and register with socket layer. */
1161 void sctp_v6_pf_init(void)
1163 /* Register the SCTP specific PF_INET6 functions. */
1164 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1166 /* Register the SCTP specific AF_INET6 functions. */
1167 sctp_register_af(&sctp_af_inet6);
1170 void sctp_v6_pf_exit(void)
1172 list_del(&sctp_af_inet6.list);
1175 /* Initialize IPv6 support and register with socket layer. */
1176 int sctp_v6_protosw_init(void)
1180 rc = proto_register(&sctpv6_prot, 1);
1184 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1185 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1186 inet6_register_protosw(&sctpv6_stream_protosw);
1191 void sctp_v6_protosw_exit(void)
1193 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1194 inet6_unregister_protosw(&sctpv6_stream_protosw);
1195 proto_unregister(&sctpv6_prot);
1199 /* Register with inet6 layer. */
1200 int sctp_v6_add_protocol(void)
1202 /* Register notifier for inet6 address additions/deletions. */
1203 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1205 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1211 /* Unregister with inet6 layer. */
1212 void sctp_v6_del_protocol(void)
1214 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1215 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);