ARM: 7409/1: Do not call flush_cache_user_range with mmap_sem held
[linux/fpc-iii.git] / net / sctp / ipv6.c
blob0bb0d7cb9f10b8888dafe7fd8c82183a43d53aae
1 /* SCTP kernel implementation
2 * (C) Copyright IBM Corp. 2002, 2004
3 * Copyright (c) 2001 Nokia, Inc.
4 * Copyright (c) 2001 La Monte H.P. Yarroll
5 * Copyright (c) 2002-2003 Intel Corp.
7 * This file is part of the SCTP kernel implementation
9 * SCTP over IPv6.
11 * This SCTP implementation is free software;
12 * you can redistribute it and/or modify it under the terms of
13 * the GNU General Public License as published by
14 * the Free Software Foundation; either version 2, or (at your option)
15 * any later version.
17 * This SCTP implementation is distributed in the hope that it
18 * will be useful, but WITHOUT ANY WARRANTY; without even the implied
19 * ************************
20 * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
21 * See the GNU General Public License for more details.
23 * You should have received a copy of the GNU General Public License
24 * along with GNU CC; see the file COPYING. If not, write to
25 * the Free Software Foundation, 59 Temple Place - Suite 330,
26 * Boston, MA 02111-1307, USA.
28 * Please send any bug reports or fixes you make to the
29 * email address(es):
30 * lksctp developers <lksctp-developers@lists.sourceforge.net>
32 * Or submit a bug report through the following website:
33 * http://www.sf.net/projects/lksctp
35 * Written or modified by:
36 * Le Yanqun <yanqun.le@nokia.com>
37 * Hui Huang <hui.huang@nokia.com>
38 * La Monte H.P. Yarroll <piggy@acm.org>
39 * Sridhar Samudrala <sri@us.ibm.com>
40 * Jon Grimm <jgrimm@us.ibm.com>
41 * Ardelle Fan <ardelle.fan@intel.com>
43 * Based on:
44 * linux/net/ipv6/tcp_ipv6.c
46 * Any bugs reported given to us we will try to fix... any fixes shared will
47 * be incorporated into the next SCTP release.
50 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
52 #include <linux/module.h>
53 #include <linux/errno.h>
54 #include <linux/types.h>
55 #include <linux/socket.h>
56 #include <linux/sockios.h>
57 #include <linux/net.h>
58 #include <linux/in.h>
59 #include <linux/in6.h>
60 #include <linux/netdevice.h>
61 #include <linux/init.h>
62 #include <linux/ipsec.h>
63 #include <linux/slab.h>
65 #include <linux/ipv6.h>
66 #include <linux/icmpv6.h>
67 #include <linux/random.h>
68 #include <linux/seq_file.h>
70 #include <net/protocol.h>
71 #include <net/ndisc.h>
72 #include <net/ip.h>
73 #include <net/ipv6.h>
74 #include <net/transp_v6.h>
75 #include <net/addrconf.h>
76 #include <net/ip6_route.h>
77 #include <net/inet_common.h>
78 #include <net/inet_ecn.h>
79 #include <net/sctp/sctp.h>
81 #include <asm/uaccess.h>
83 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
84 union sctp_addr *s2);
85 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
86 __be16 port);
87 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
88 const union sctp_addr *addr2);
90 /* Event handler for inet6 address addition/deletion events.
91 * The sctp_local_addr_list needs to be protocted by a spin lock since
92 * multiple notifiers (say IPv4 and IPv6) may be running at the same
93 * time and thus corrupt the list.
94 * The reader side is protected with RCU.
96 static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev,
97 void *ptr)
99 struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr;
100 struct sctp_sockaddr_entry *addr = NULL;
101 struct sctp_sockaddr_entry *temp;
102 int found = 0;
104 switch (ev) {
105 case NETDEV_UP:
106 addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC);
107 if (addr) {
108 addr->a.v6.sin6_family = AF_INET6;
109 addr->a.v6.sin6_port = 0;
110 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifa->addr);
111 addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex;
112 addr->valid = 1;
113 spin_lock_bh(&sctp_local_addr_lock);
114 list_add_tail_rcu(&addr->list, &sctp_local_addr_list);
115 spin_unlock_bh(&sctp_local_addr_lock);
117 break;
118 case NETDEV_DOWN:
119 spin_lock_bh(&sctp_local_addr_lock);
120 list_for_each_entry_safe(addr, temp,
121 &sctp_local_addr_list, list) {
122 if (addr->a.sa.sa_family == AF_INET6 &&
123 ipv6_addr_equal(&addr->a.v6.sin6_addr,
124 &ifa->addr)) {
125 found = 1;
126 addr->valid = 0;
127 list_del_rcu(&addr->list);
128 break;
131 spin_unlock_bh(&sctp_local_addr_lock);
132 if (found)
133 kfree_rcu(addr, rcu);
134 break;
137 return NOTIFY_DONE;
140 static struct notifier_block sctp_inet6addr_notifier = {
141 .notifier_call = sctp_inet6addr_event,
144 /* ICMP error handler. */
145 SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
146 u8 type, u8 code, int offset, __be32 info)
148 struct inet6_dev *idev;
149 struct sock *sk;
150 struct sctp_association *asoc;
151 struct sctp_transport *transport;
152 struct ipv6_pinfo *np;
153 sk_buff_data_t saveip, savesctp;
154 int err;
156 idev = in6_dev_get(skb->dev);
158 /* Fix up skb to look at the embedded net header. */
159 saveip = skb->network_header;
160 savesctp = skb->transport_header;
161 skb_reset_network_header(skb);
162 skb_set_transport_header(skb, offset);
163 sk = sctp_err_lookup(AF_INET6, skb, sctp_hdr(skb), &asoc, &transport);
164 /* Put back, the original pointers. */
165 skb->network_header = saveip;
166 skb->transport_header = savesctp;
167 if (!sk) {
168 ICMP6_INC_STATS_BH(dev_net(skb->dev), idev, ICMP6_MIB_INERRORS);
169 goto out;
172 /* Warning: The sock lock is held. Remember to call
173 * sctp_err_finish!
176 switch (type) {
177 case ICMPV6_PKT_TOOBIG:
178 sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
179 goto out_unlock;
180 case ICMPV6_PARAMPROB:
181 if (ICMPV6_UNK_NEXTHDR == code) {
182 sctp_icmp_proto_unreachable(sk, asoc, transport);
183 goto out_unlock;
185 break;
186 default:
187 break;
190 np = inet6_sk(sk);
191 icmpv6_err_convert(type, code, &err);
192 if (!sock_owned_by_user(sk) && np->recverr) {
193 sk->sk_err = err;
194 sk->sk_error_report(sk);
195 } else { /* Only an error on timeout */
196 sk->sk_err_soft = err;
199 out_unlock:
200 sctp_err_finish(sk, asoc);
201 out:
202 if (likely(idev != NULL))
203 in6_dev_put(idev);
206 /* Based on tcp_v6_xmit() in tcp_ipv6.c. */
207 static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport)
209 struct sock *sk = skb->sk;
210 struct ipv6_pinfo *np = inet6_sk(sk);
211 struct flowi6 fl6;
213 memset(&fl6, 0, sizeof(fl6));
215 fl6.flowi6_proto = sk->sk_protocol;
217 /* Fill in the dest address from the route entry passed with the skb
218 * and the source address from the transport.
220 ipv6_addr_copy(&fl6.daddr, &transport->ipaddr.v6.sin6_addr);
221 ipv6_addr_copy(&fl6.saddr, &transport->saddr.v6.sin6_addr);
223 fl6.flowlabel = np->flow_label;
224 IP6_ECN_flow_xmit(sk, fl6.flowlabel);
225 if (ipv6_addr_type(&fl6.saddr) & IPV6_ADDR_LINKLOCAL)
226 fl6.flowi6_oif = transport->saddr.v6.sin6_scope_id;
227 else
228 fl6.flowi6_oif = sk->sk_bound_dev_if;
230 if (np->opt && np->opt->srcrt) {
231 struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
232 ipv6_addr_copy(&fl6.daddr, rt0->addr);
235 SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
236 __func__, skb, skb->len,
237 &fl6.saddr, &fl6.daddr);
239 SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
241 if (!(transport->param_flags & SPP_PMTUD_ENABLE))
242 skb->local_df = 1;
244 return ip6_xmit(sk, skb, &fl6, np->opt);
247 /* Returns the dst cache entry for the given source and destination ip
248 * addresses.
250 static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr,
251 struct flowi *fl, struct sock *sk)
253 struct sctp_association *asoc = t->asoc;
254 struct dst_entry *dst = NULL;
255 struct flowi6 *fl6 = &fl->u.ip6;
256 struct sctp_bind_addr *bp;
257 struct sctp_sockaddr_entry *laddr;
258 union sctp_addr *baddr = NULL;
259 union sctp_addr *daddr = &t->ipaddr;
260 union sctp_addr dst_saddr;
261 __u8 matchlen = 0;
262 __u8 bmatchlen;
263 sctp_scope_t scope;
265 memset(fl6, 0, sizeof(struct flowi6));
266 ipv6_addr_copy(&fl6->daddr, &daddr->v6.sin6_addr);
267 fl6->fl6_dport = daddr->v6.sin6_port;
268 fl6->flowi6_proto = IPPROTO_SCTP;
269 if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
270 fl6->flowi6_oif = daddr->v6.sin6_scope_id;
272 SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
274 if (asoc)
275 fl6->fl6_sport = htons(asoc->base.bind_addr.port);
277 if (saddr) {
278 ipv6_addr_copy(&fl6->saddr, &saddr->v6.sin6_addr);
279 fl6->fl6_sport = saddr->v6.sin6_port;
280 SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
283 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
284 if (!asoc || saddr)
285 goto out;
287 bp = &asoc->base.bind_addr;
288 scope = sctp_scope(daddr);
289 /* ip6_dst_lookup has filled in the fl6->saddr for us. Check
290 * to see if we can use it.
292 if (!IS_ERR(dst)) {
293 /* Walk through the bind address list and look for a bind
294 * address that matches the source address of the returned dst.
296 sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port));
297 rcu_read_lock();
298 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
299 if (!laddr->valid || (laddr->state != SCTP_ADDR_SRC))
300 continue;
302 /* Do not compare against v4 addrs */
303 if ((laddr->a.sa.sa_family == AF_INET6) &&
304 (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) {
305 rcu_read_unlock();
306 goto out;
309 rcu_read_unlock();
310 /* None of the bound addresses match the source address of the
311 * dst. So release it.
313 dst_release(dst);
314 dst = NULL;
317 /* Walk through the bind address list and try to get the
318 * best source address for a given destination.
320 rcu_read_lock();
321 list_for_each_entry_rcu(laddr, &bp->address_list, list) {
322 if (!laddr->valid && laddr->state != SCTP_ADDR_SRC)
323 continue;
324 if ((laddr->a.sa.sa_family == AF_INET6) &&
325 (scope <= sctp_scope(&laddr->a))) {
326 bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
327 if (!baddr || (matchlen < bmatchlen)) {
328 baddr = &laddr->a;
329 matchlen = bmatchlen;
333 rcu_read_unlock();
334 if (baddr) {
335 ipv6_addr_copy(&fl6->saddr, &baddr->v6.sin6_addr);
336 fl6->fl6_sport = baddr->v6.sin6_port;
337 dst = ip6_dst_lookup_flow(sk, fl6, NULL, false);
340 out:
341 if (!IS_ERR(dst)) {
342 struct rt6_info *rt;
343 rt = (struct rt6_info *)dst;
344 t->dst = dst;
345 SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
346 &rt->rt6i_dst.addr, &fl6->saddr);
347 } else {
348 t->dst = NULL;
349 SCTP_DEBUG_PRINTK("NO ROUTE\n");
353 /* Returns the number of consecutive initial bits that match in the 2 ipv6
354 * addresses.
356 static inline int sctp_v6_addr_match_len(union sctp_addr *s1,
357 union sctp_addr *s2)
359 return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr);
362 /* Fills in the source address(saddr) based on the destination address(daddr)
363 * and asoc's bind address list.
365 static void sctp_v6_get_saddr(struct sctp_sock *sk,
366 struct sctp_transport *t,
367 struct flowi *fl)
369 struct flowi6 *fl6 = &fl->u.ip6;
370 union sctp_addr *saddr = &t->saddr;
372 SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
374 if (t->dst) {
375 saddr->v6.sin6_family = AF_INET6;
376 ipv6_addr_copy(&saddr->v6.sin6_addr, &fl6->saddr);
380 /* Make a copy of all potential local addresses. */
381 static void sctp_v6_copy_addrlist(struct list_head *addrlist,
382 struct net_device *dev)
384 struct inet6_dev *in6_dev;
385 struct inet6_ifaddr *ifp;
386 struct sctp_sockaddr_entry *addr;
388 rcu_read_lock();
389 if ((in6_dev = __in6_dev_get(dev)) == NULL) {
390 rcu_read_unlock();
391 return;
394 read_lock_bh(&in6_dev->lock);
395 list_for_each_entry(ifp, &in6_dev->addr_list, if_list) {
396 /* Add the address to the local list. */
397 addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
398 if (addr) {
399 addr->a.v6.sin6_family = AF_INET6;
400 addr->a.v6.sin6_port = 0;
401 ipv6_addr_copy(&addr->a.v6.sin6_addr, &ifp->addr);
402 addr->a.v6.sin6_scope_id = dev->ifindex;
403 addr->valid = 1;
404 INIT_LIST_HEAD(&addr->list);
405 list_add_tail(&addr->list, addrlist);
409 read_unlock_bh(&in6_dev->lock);
410 rcu_read_unlock();
413 /* Initialize a sockaddr_storage from in incoming skb. */
414 static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
415 int is_saddr)
417 void *from;
418 __be16 *port;
419 struct sctphdr *sh;
421 port = &addr->v6.sin6_port;
422 addr->v6.sin6_family = AF_INET6;
423 addr->v6.sin6_flowinfo = 0; /* FIXME */
424 addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif;
426 sh = sctp_hdr(skb);
427 if (is_saddr) {
428 *port = sh->source;
429 from = &ipv6_hdr(skb)->saddr;
430 } else {
431 *port = sh->dest;
432 from = &ipv6_hdr(skb)->daddr;
434 ipv6_addr_copy(&addr->v6.sin6_addr, from);
437 /* Initialize an sctp_addr from a socket. */
438 static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk)
440 addr->v6.sin6_family = AF_INET6;
441 addr->v6.sin6_port = 0;
442 ipv6_addr_copy(&addr->v6.sin6_addr, &inet6_sk(sk)->rcv_saddr);
445 /* Initialize sk->sk_rcv_saddr from sctp_addr. */
446 static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk)
448 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
449 inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
450 inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
451 inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
452 inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
453 addr->v4.sin_addr.s_addr;
454 } else {
455 ipv6_addr_copy(&inet6_sk(sk)->rcv_saddr, &addr->v6.sin6_addr);
459 /* Initialize sk->sk_daddr from sctp_addr. */
460 static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk)
462 if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) {
463 inet6_sk(sk)->daddr.s6_addr32[0] = 0;
464 inet6_sk(sk)->daddr.s6_addr32[1] = 0;
465 inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
466 inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
467 } else {
468 ipv6_addr_copy(&inet6_sk(sk)->daddr, &addr->v6.sin6_addr);
472 /* Initialize a sctp_addr from an address parameter. */
473 static void sctp_v6_from_addr_param(union sctp_addr *addr,
474 union sctp_addr_param *param,
475 __be16 port, int iif)
477 addr->v6.sin6_family = AF_INET6;
478 addr->v6.sin6_port = port;
479 addr->v6.sin6_flowinfo = 0; /* BUG */
480 ipv6_addr_copy(&addr->v6.sin6_addr, &param->v6.addr);
481 addr->v6.sin6_scope_id = iif;
484 /* Initialize an address parameter from a sctp_addr and return the length
485 * of the address parameter.
487 static int sctp_v6_to_addr_param(const union sctp_addr *addr,
488 union sctp_addr_param *param)
490 int length = sizeof(sctp_ipv6addr_param_t);
492 param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS;
493 param->v6.param_hdr.length = htons(length);
494 ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
496 return length;
499 /* Initialize a sctp_addr from struct in6_addr. */
500 static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr,
501 __be16 port)
503 addr->sa.sa_family = AF_INET6;
504 addr->v6.sin6_port = port;
505 ipv6_addr_copy(&addr->v6.sin6_addr, saddr);
508 /* Compare addresses exactly.
509 * v4-mapped-v6 is also in consideration.
511 static int sctp_v6_cmp_addr(const union sctp_addr *addr1,
512 const union sctp_addr *addr2)
514 if (addr1->sa.sa_family != addr2->sa.sa_family) {
515 if (addr1->sa.sa_family == AF_INET &&
516 addr2->sa.sa_family == AF_INET6 &&
517 ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) {
518 if (addr2->v6.sin6_port == addr1->v4.sin_port &&
519 addr2->v6.sin6_addr.s6_addr32[3] ==
520 addr1->v4.sin_addr.s_addr)
521 return 1;
523 if (addr2->sa.sa_family == AF_INET &&
524 addr1->sa.sa_family == AF_INET6 &&
525 ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) {
526 if (addr1->v6.sin6_port == addr2->v4.sin_port &&
527 addr1->v6.sin6_addr.s6_addr32[3] ==
528 addr2->v4.sin_addr.s_addr)
529 return 1;
531 return 0;
533 if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr))
534 return 0;
535 /* If this is a linklocal address, compare the scope_id. */
536 if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) {
537 if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id &&
538 (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) {
539 return 0;
543 return 1;
546 /* Initialize addr struct to INADDR_ANY. */
547 static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port)
549 memset(addr, 0x00, sizeof(union sctp_addr));
550 addr->v6.sin6_family = AF_INET6;
551 addr->v6.sin6_port = port;
554 /* Is this a wildcard address? */
555 static int sctp_v6_is_any(const union sctp_addr *addr)
557 return ipv6_addr_any(&addr->v6.sin6_addr);
560 /* Should this be available for binding? */
561 static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
563 int type;
564 const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr;
566 type = ipv6_addr_type(in6);
567 if (IPV6_ADDR_ANY == type)
568 return 1;
569 if (type == IPV6_ADDR_MAPPED) {
570 if (sp && !sp->v4mapped)
571 return 0;
572 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
573 return 0;
574 sctp_v6_map_v4(addr);
575 return sctp_get_af_specific(AF_INET)->available(addr, sp);
577 if (!(type & IPV6_ADDR_UNICAST))
578 return 0;
580 return ipv6_chk_addr(&init_net, in6, NULL, 0);
583 /* This function checks if the address is a valid address to be used for
584 * SCTP.
586 * Output:
587 * Return 0 - If the address is a non-unicast or an illegal address.
588 * Return 1 - If the address is a unicast.
590 static int sctp_v6_addr_valid(union sctp_addr *addr,
591 struct sctp_sock *sp,
592 const struct sk_buff *skb)
594 int ret = ipv6_addr_type(&addr->v6.sin6_addr);
596 /* Support v4-mapped-v6 address. */
597 if (ret == IPV6_ADDR_MAPPED) {
598 /* Note: This routine is used in input, so v4-mapped-v6
599 * are disallowed here when there is no sctp_sock.
601 if (!sp || !sp->v4mapped)
602 return 0;
603 if (sp && ipv6_only_sock(sctp_opt2sk(sp)))
604 return 0;
605 sctp_v6_map_v4(addr);
606 return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb);
609 /* Is this a non-unicast address */
610 if (!(ret & IPV6_ADDR_UNICAST))
611 return 0;
613 return 1;
616 /* What is the scope of 'addr'? */
617 static sctp_scope_t sctp_v6_scope(union sctp_addr *addr)
619 int v6scope;
620 sctp_scope_t retval;
622 /* The IPv6 scope is really a set of bit fields.
623 * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope.
626 v6scope = ipv6_addr_scope(&addr->v6.sin6_addr);
627 switch (v6scope) {
628 case IFA_HOST:
629 retval = SCTP_SCOPE_LOOPBACK;
630 break;
631 case IFA_LINK:
632 retval = SCTP_SCOPE_LINK;
633 break;
634 case IFA_SITE:
635 retval = SCTP_SCOPE_PRIVATE;
636 break;
637 default:
638 retval = SCTP_SCOPE_GLOBAL;
639 break;
642 return retval;
645 /* Create and initialize a new sk for the socket to be returned by accept(). */
646 static struct sock *sctp_v6_create_accept_sk(struct sock *sk,
647 struct sctp_association *asoc)
649 struct sock *newsk;
650 struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
651 struct sctp6_sock *newsctp6sk;
653 newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
654 if (!newsk)
655 goto out;
657 sock_init_data(NULL, newsk);
659 sctp_copy_sock(newsk, sk, asoc);
660 sock_reset_flag(sk, SOCK_ZAPPED);
662 newsctp6sk = (struct sctp6_sock *)newsk;
663 inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
665 sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped;
667 newnp = inet6_sk(newsk);
669 memcpy(newnp, np, sizeof(struct ipv6_pinfo));
671 /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
672 * and getpeername().
674 sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
676 sk_refcnt_debug_inc(newsk);
678 if (newsk->sk_prot->init(newsk)) {
679 sk_common_release(newsk);
680 newsk = NULL;
683 out:
684 return newsk;
687 /* Map v4 address to mapped v6 address */
688 static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
690 if (sp->v4mapped && AF_INET == addr->sa.sa_family)
691 sctp_v4_map_v6(addr);
694 /* Where did this skb come from? */
695 static int sctp_v6_skb_iif(const struct sk_buff *skb)
697 struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb;
698 return opt->iif;
701 /* Was this packet marked by Explicit Congestion Notification? */
702 static int sctp_v6_is_ce(const struct sk_buff *skb)
704 return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20);
707 /* Dump the v6 addr to the seq file. */
708 static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr)
710 seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr);
713 static void sctp_v6_ecn_capable(struct sock *sk)
715 inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
718 /* Initialize a PF_INET6 socket msg_name. */
719 static void sctp_inet6_msgname(char *msgname, int *addr_len)
721 struct sockaddr_in6 *sin6;
723 sin6 = (struct sockaddr_in6 *)msgname;
724 sin6->sin6_family = AF_INET6;
725 sin6->sin6_flowinfo = 0;
726 sin6->sin6_scope_id = 0; /*FIXME */
727 *addr_len = sizeof(struct sockaddr_in6);
730 /* Initialize a PF_INET msgname from a ulpevent. */
731 static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
732 char *msgname, int *addrlen)
734 struct sockaddr_in6 *sin6, *sin6from;
736 if (msgname) {
737 union sctp_addr *addr;
738 struct sctp_association *asoc;
740 asoc = event->asoc;
741 sctp_inet6_msgname(msgname, addrlen);
742 sin6 = (struct sockaddr_in6 *)msgname;
743 sin6->sin6_port = htons(asoc->peer.port);
744 addr = &asoc->peer.primary_addr;
746 /* Note: If we go to a common v6 format, this code
747 * will change.
750 /* Map ipv4 address into v4-mapped-on-v6 address. */
751 if (sctp_sk(asoc->base.sk)->v4mapped &&
752 AF_INET == addr->sa.sa_family) {
753 sctp_v4_map_v6((union sctp_addr *)sin6);
754 sin6->sin6_addr.s6_addr32[3] =
755 addr->v4.sin_addr.s_addr;
756 return;
759 sin6from = &asoc->peer.primary_addr.v6;
760 ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
761 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
762 sin6->sin6_scope_id = sin6from->sin6_scope_id;
766 /* Initialize a msg_name from an inbound skb. */
767 static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
768 int *addr_len)
770 struct sctphdr *sh;
771 struct sockaddr_in6 *sin6;
773 if (msgname) {
774 sctp_inet6_msgname(msgname, addr_len);
775 sin6 = (struct sockaddr_in6 *)msgname;
776 sh = sctp_hdr(skb);
777 sin6->sin6_port = sh->source;
779 /* Map ipv4 address into v4-mapped-on-v6 address. */
780 if (sctp_sk(skb->sk)->v4mapped &&
781 ip_hdr(skb)->version == 4) {
782 sctp_v4_map_v6((union sctp_addr *)sin6);
783 sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
784 return;
787 /* Otherwise, just copy the v6 address. */
788 ipv6_addr_copy(&sin6->sin6_addr, &ipv6_hdr(skb)->saddr);
789 if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
790 struct sctp_ulpevent *ev = sctp_skb2event(skb);
791 sin6->sin6_scope_id = ev->iif;
796 /* Do we support this AF? */
797 static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp)
799 switch (family) {
800 case AF_INET6:
801 return 1;
802 /* v4-mapped-v6 addresses */
803 case AF_INET:
804 if (!__ipv6_only_sock(sctp_opt2sk(sp)))
805 return 1;
806 default:
807 return 0;
811 /* Address matching with wildcards allowed. This extra level
812 * of indirection lets us choose whether a PF_INET6 should
813 * disallow any v4 addresses if we so choose.
815 static int sctp_inet6_cmp_addr(const union sctp_addr *addr1,
816 const union sctp_addr *addr2,
817 struct sctp_sock *opt)
819 struct sctp_af *af1, *af2;
820 struct sock *sk = sctp_opt2sk(opt);
822 af1 = sctp_get_af_specific(addr1->sa.sa_family);
823 af2 = sctp_get_af_specific(addr2->sa.sa_family);
825 if (!af1 || !af2)
826 return 0;
828 /* If the socket is IPv6 only, v4 addrs will not match */
829 if (__ipv6_only_sock(sk) && af1 != af2)
830 return 0;
832 /* Today, wildcard AF_INET/AF_INET6. */
833 if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2))
834 return 1;
836 if (addr1->sa.sa_family != addr2->sa.sa_family)
837 return 0;
839 return af1->cmp_addr(addr1, addr2);
842 /* Verify that the provided sockaddr looks bindable. Common verification,
843 * has already been taken care of.
845 static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr)
847 struct sctp_af *af;
849 /* ASSERT: address family has already been verified. */
850 if (addr->sa.sa_family != AF_INET6)
851 af = sctp_get_af_specific(addr->sa.sa_family);
852 else {
853 int type = ipv6_addr_type(&addr->v6.sin6_addr);
854 struct net_device *dev;
856 if (type & IPV6_ADDR_LINKLOCAL) {
857 if (!addr->v6.sin6_scope_id)
858 return 0;
859 rcu_read_lock();
860 dev = dev_get_by_index_rcu(&init_net,
861 addr->v6.sin6_scope_id);
862 if (!dev ||
863 !ipv6_chk_addr(&init_net, &addr->v6.sin6_addr,
864 dev, 0)) {
865 rcu_read_unlock();
866 return 0;
868 rcu_read_unlock();
869 } else if (type == IPV6_ADDR_MAPPED) {
870 if (!opt->v4mapped)
871 return 0;
874 af = opt->pf->af;
876 return af->available(addr, opt);
879 /* Verify that the provided sockaddr looks sendable. Common verification,
880 * has already been taken care of.
882 static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr)
884 struct sctp_af *af = NULL;
886 /* ASSERT: address family has already been verified. */
887 if (addr->sa.sa_family != AF_INET6)
888 af = sctp_get_af_specific(addr->sa.sa_family);
889 else {
890 int type = ipv6_addr_type(&addr->v6.sin6_addr);
891 struct net_device *dev;
893 if (type & IPV6_ADDR_LINKLOCAL) {
894 if (!addr->v6.sin6_scope_id)
895 return 0;
896 rcu_read_lock();
897 dev = dev_get_by_index_rcu(&init_net,
898 addr->v6.sin6_scope_id);
899 rcu_read_unlock();
900 if (!dev)
901 return 0;
903 af = opt->pf->af;
906 return af != NULL;
909 /* Fill in Supported Address Type information for INIT and INIT-ACK
910 * chunks. Note: In the future, we may want to look at sock options
911 * to determine whether a PF_INET6 socket really wants to have IPV4
912 * addresses.
913 * Returns number of addresses supported.
915 static int sctp_inet6_supported_addrs(const struct sctp_sock *opt,
916 __be16 *types)
918 types[0] = SCTP_PARAM_IPV6_ADDRESS;
919 if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) {
920 types[1] = SCTP_PARAM_IPV4_ADDRESS;
921 return 2;
923 return 1;
926 static const struct proto_ops inet6_seqpacket_ops = {
927 .family = PF_INET6,
928 .owner = THIS_MODULE,
929 .release = inet6_release,
930 .bind = inet6_bind,
931 .connect = inet_dgram_connect,
932 .socketpair = sock_no_socketpair,
933 .accept = inet_accept,
934 .getname = inet6_getname,
935 .poll = sctp_poll,
936 .ioctl = inet6_ioctl,
937 .listen = sctp_inet_listen,
938 .shutdown = inet_shutdown,
939 .setsockopt = sock_common_setsockopt,
940 .getsockopt = sock_common_getsockopt,
941 .sendmsg = inet_sendmsg,
942 .recvmsg = sock_common_recvmsg,
943 .mmap = sock_no_mmap,
944 #ifdef CONFIG_COMPAT
945 .compat_setsockopt = compat_sock_common_setsockopt,
946 .compat_getsockopt = compat_sock_common_getsockopt,
947 #endif
950 static struct inet_protosw sctpv6_seqpacket_protosw = {
951 .type = SOCK_SEQPACKET,
952 .protocol = IPPROTO_SCTP,
953 .prot = &sctpv6_prot,
954 .ops = &inet6_seqpacket_ops,
955 .no_check = 0,
956 .flags = SCTP_PROTOSW_FLAG
958 static struct inet_protosw sctpv6_stream_protosw = {
959 .type = SOCK_STREAM,
960 .protocol = IPPROTO_SCTP,
961 .prot = &sctpv6_prot,
962 .ops = &inet6_seqpacket_ops,
963 .no_check = 0,
964 .flags = SCTP_PROTOSW_FLAG,
967 static int sctp6_rcv(struct sk_buff *skb)
969 return sctp_rcv(skb) ? -1 : 0;
972 static const struct inet6_protocol sctpv6_protocol = {
973 .handler = sctp6_rcv,
974 .err_handler = sctp_v6_err,
975 .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL,
978 static struct sctp_af sctp_af_inet6 = {
979 .sa_family = AF_INET6,
980 .sctp_xmit = sctp_v6_xmit,
981 .setsockopt = ipv6_setsockopt,
982 .getsockopt = ipv6_getsockopt,
983 .get_dst = sctp_v6_get_dst,
984 .get_saddr = sctp_v6_get_saddr,
985 .copy_addrlist = sctp_v6_copy_addrlist,
986 .from_skb = sctp_v6_from_skb,
987 .from_sk = sctp_v6_from_sk,
988 .to_sk_saddr = sctp_v6_to_sk_saddr,
989 .to_sk_daddr = sctp_v6_to_sk_daddr,
990 .from_addr_param = sctp_v6_from_addr_param,
991 .to_addr_param = sctp_v6_to_addr_param,
992 .cmp_addr = sctp_v6_cmp_addr,
993 .scope = sctp_v6_scope,
994 .addr_valid = sctp_v6_addr_valid,
995 .inaddr_any = sctp_v6_inaddr_any,
996 .is_any = sctp_v6_is_any,
997 .available = sctp_v6_available,
998 .skb_iif = sctp_v6_skb_iif,
999 .is_ce = sctp_v6_is_ce,
1000 .seq_dump_addr = sctp_v6_seq_dump_addr,
1001 .ecn_capable = sctp_v6_ecn_capable,
1002 .net_header_len = sizeof(struct ipv6hdr),
1003 .sockaddr_len = sizeof(struct sockaddr_in6),
1004 #ifdef CONFIG_COMPAT
1005 .compat_setsockopt = compat_ipv6_setsockopt,
1006 .compat_getsockopt = compat_ipv6_getsockopt,
1007 #endif
1010 static struct sctp_pf sctp_pf_inet6 = {
1011 .event_msgname = sctp_inet6_event_msgname,
1012 .skb_msgname = sctp_inet6_skb_msgname,
1013 .af_supported = sctp_inet6_af_supported,
1014 .cmp_addr = sctp_inet6_cmp_addr,
1015 .bind_verify = sctp_inet6_bind_verify,
1016 .send_verify = sctp_inet6_send_verify,
1017 .supported_addrs = sctp_inet6_supported_addrs,
1018 .create_accept_sk = sctp_v6_create_accept_sk,
1019 .addr_v4map = sctp_v6_addr_v4map,
1020 .af = &sctp_af_inet6,
1023 /* Initialize IPv6 support and register with socket layer. */
1024 void sctp_v6_pf_init(void)
1026 /* Register the SCTP specific PF_INET6 functions. */
1027 sctp_register_pf(&sctp_pf_inet6, PF_INET6);
1029 /* Register the SCTP specific AF_INET6 functions. */
1030 sctp_register_af(&sctp_af_inet6);
1033 void sctp_v6_pf_exit(void)
1035 list_del(&sctp_af_inet6.list);
1038 /* Initialize IPv6 support and register with socket layer. */
1039 int sctp_v6_protosw_init(void)
1041 int rc;
1043 rc = proto_register(&sctpv6_prot, 1);
1044 if (rc)
1045 return rc;
1047 /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
1048 inet6_register_protosw(&sctpv6_seqpacket_protosw);
1049 inet6_register_protosw(&sctpv6_stream_protosw);
1051 return 0;
1054 void sctp_v6_protosw_exit(void)
1056 inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
1057 inet6_unregister_protosw(&sctpv6_stream_protosw);
1058 proto_unregister(&sctpv6_prot);
1062 /* Register with inet6 layer. */
1063 int sctp_v6_add_protocol(void)
1065 /* Register notifier for inet6 address additions/deletions. */
1066 register_inet6addr_notifier(&sctp_inet6addr_notifier);
1068 if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
1069 return -EAGAIN;
1071 return 0;
1074 /* Unregister with inet6 layer. */
1075 void sctp_v6_del_protocol(void)
1077 inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
1078 unregister_inet6addr_notifier(&sctp_inet6addr_notifier);