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1da177e4 LT |
1 | /* SCTP kernel reference 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. | |
6 | * | |
7 | * This file is part of the SCTP kernel reference Implementation | |
8 | * | |
9 | * SCTP over IPv6. | |
10 | * | |
11 | * The SCTP reference 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. | |
16 | * | |
17 | * The SCTP reference 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. | |
22 | * | |
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. | |
27 | * | |
28 | * Please send any bug reports or fixes you make to the | |
29 | * email address(es): | |
30 | * lksctp developers <lksctp-developers@lists.sourceforge.net> | |
31 | * | |
32 | * Or submit a bug report through the following website: | |
33 | * http://www.sf.net/projects/lksctp | |
34 | * | |
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> | |
42 | * | |
43 | * Based on: | |
44 | * linux/net/ipv6/tcp_ipv6.c | |
45 | * | |
46 | * Any bugs reported given to us we will try to fix... any fixes shared will | |
47 | * be incorporated into the next SCTP release. | |
48 | */ | |
49 | ||
50 | #include <linux/module.h> | |
51 | #include <linux/errno.h> | |
52 | #include <linux/types.h> | |
53 | #include <linux/socket.h> | |
54 | #include <linux/sockios.h> | |
55 | #include <linux/net.h> | |
56 | #include <linux/sched.h> | |
57 | #include <linux/in.h> | |
58 | #include <linux/in6.h> | |
59 | #include <linux/netdevice.h> | |
60 | #include <linux/init.h> | |
61 | #include <linux/ipsec.h> | |
62 | ||
63 | #include <linux/ipv6.h> | |
64 | #include <linux/icmpv6.h> | |
65 | #include <linux/random.h> | |
66 | #include <linux/seq_file.h> | |
67 | ||
68 | #include <net/protocol.h> | |
69 | #include <net/tcp.h> | |
70 | #include <net/ndisc.h> | |
71 | #include <net/ipv6.h> | |
72 | #include <net/transp_v6.h> | |
73 | #include <net/addrconf.h> | |
74 | #include <net/ip6_route.h> | |
75 | #include <net/inet_common.h> | |
76 | #include <net/inet_ecn.h> | |
77 | #include <net/sctp/sctp.h> | |
78 | ||
79 | #include <asm/uaccess.h> | |
80 | ||
81 | extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *); | |
82 | static struct notifier_block sctp_inet6addr_notifier = { | |
83 | .notifier_call = sctp_inetaddr_event, | |
84 | }; | |
85 | ||
86 | /* ICMP error handler. */ | |
87 | SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, | |
88 | int type, int code, int offset, __u32 info) | |
89 | { | |
90 | struct inet6_dev *idev; | |
91 | struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; | |
92 | struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); | |
93 | struct sock *sk; | |
94 | struct sctp_endpoint *ep; | |
95 | struct sctp_association *asoc; | |
96 | struct sctp_transport *transport; | |
97 | struct ipv6_pinfo *np; | |
98 | char *saveip, *savesctp; | |
99 | int err; | |
100 | ||
101 | idev = in6_dev_get(skb->dev); | |
102 | ||
103 | /* Fix up skb to look at the embedded net header. */ | |
104 | saveip = skb->nh.raw; | |
105 | savesctp = skb->h.raw; | |
106 | skb->nh.ipv6h = iph; | |
107 | skb->h.raw = (char *)sh; | |
108 | sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport); | |
109 | /* Put back, the original pointers. */ | |
110 | skb->nh.raw = saveip; | |
111 | skb->h.raw = savesctp; | |
112 | if (!sk) { | |
113 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); | |
114 | goto out; | |
115 | } | |
116 | ||
117 | /* Warning: The sock lock is held. Remember to call | |
118 | * sctp_err_finish! | |
119 | */ | |
120 | ||
121 | switch (type) { | |
122 | case ICMPV6_PKT_TOOBIG: | |
123 | sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); | |
124 | goto out_unlock; | |
125 | case ICMPV6_PARAMPROB: | |
126 | if (ICMPV6_UNK_NEXTHDR == code) { | |
127 | sctp_icmp_proto_unreachable(sk, ep, asoc, transport); | |
128 | goto out_unlock; | |
129 | } | |
130 | break; | |
131 | default: | |
132 | break; | |
133 | } | |
134 | ||
135 | np = inet6_sk(sk); | |
136 | icmpv6_err_convert(type, code, &err); | |
137 | if (!sock_owned_by_user(sk) && np->recverr) { | |
138 | sk->sk_err = err; | |
139 | sk->sk_error_report(sk); | |
140 | } else { /* Only an error on timeout */ | |
141 | sk->sk_err_soft = err; | |
142 | } | |
143 | ||
144 | out_unlock: | |
145 | sctp_err_finish(sk, ep, asoc); | |
146 | out: | |
147 | if (likely(idev != NULL)) | |
148 | in6_dev_put(idev); | |
149 | } | |
150 | ||
151 | /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ | |
152 | static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, | |
153 | int ipfragok) | |
154 | { | |
155 | struct sock *sk = skb->sk; | |
156 | struct ipv6_pinfo *np = inet6_sk(sk); | |
157 | struct flowi fl; | |
158 | ||
159 | memset(&fl, 0, sizeof(fl)); | |
160 | ||
161 | fl.proto = sk->sk_protocol; | |
162 | ||
163 | /* Fill in the dest address from the route entry passed with the skb | |
164 | * and the source address from the transport. | |
165 | */ | |
166 | ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); | |
167 | ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); | |
168 | ||
169 | fl.fl6_flowlabel = np->flow_label; | |
170 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); | |
171 | if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) | |
172 | fl.oif = transport->saddr.v6.sin6_scope_id; | |
173 | else | |
174 | fl.oif = sk->sk_bound_dev_if; | |
175 | fl.fl_ip_sport = inet_sk(sk)->sport; | |
176 | fl.fl_ip_dport = transport->ipaddr.v6.sin6_port; | |
177 | ||
178 | if (np->opt && np->opt->srcrt) { | |
179 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; | |
180 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); | |
181 | } | |
182 | ||
183 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " | |
184 | "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " | |
185 | "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
186 | __FUNCTION__, skb, skb->len, | |
187 | NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); | |
188 | ||
189 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); | |
190 | ||
191 | return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); | |
192 | } | |
193 | ||
194 | /* Returns the dst cache entry for the given source and destination ip | |
195 | * addresses. | |
196 | */ | |
197 | static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, | |
198 | union sctp_addr *daddr, | |
199 | union sctp_addr *saddr) | |
200 | { | |
201 | struct dst_entry *dst; | |
202 | struct flowi fl; | |
203 | ||
204 | memset(&fl, 0, sizeof(fl)); | |
205 | ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); | |
206 | if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
207 | fl.oif = daddr->v6.sin6_scope_id; | |
208 | ||
209 | ||
210 | SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", | |
211 | __FUNCTION__, NIP6(fl.fl6_dst)); | |
212 | ||
213 | if (saddr) { | |
214 | ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); | |
215 | SCTP_DEBUG_PRINTK( | |
216 | "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ", | |
217 | NIP6(fl.fl6_src)); | |
218 | } | |
219 | ||
220 | dst = ip6_route_output(NULL, &fl); | |
221 | if (dst) { | |
222 | struct rt6_info *rt; | |
223 | rt = (struct rt6_info *)dst; | |
224 | SCTP_DEBUG_PRINTK( | |
225 | "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x " | |
226 | "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
227 | NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); | |
228 | } else { | |
229 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); | |
230 | } | |
231 | ||
232 | return dst; | |
233 | } | |
234 | ||
235 | /* Returns the number of consecutive initial bits that match in the 2 ipv6 | |
236 | * addresses. | |
237 | */ | |
238 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, | |
239 | union sctp_addr *s2) | |
240 | { | |
241 | struct in6_addr *a1 = &s1->v6.sin6_addr; | |
242 | struct in6_addr *a2 = &s2->v6.sin6_addr; | |
243 | int i, j; | |
244 | ||
245 | for (i = 0; i < 4 ; i++) { | |
246 | __u32 a1xora2; | |
247 | ||
248 | a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; | |
249 | ||
250 | if ((j = fls(ntohl(a1xora2)))) | |
251 | return (i * 32 + 32 - j); | |
252 | } | |
253 | ||
254 | return (i*32); | |
255 | } | |
256 | ||
257 | /* Fills in the source address(saddr) based on the destination address(daddr) | |
258 | * and asoc's bind address list. | |
259 | */ | |
260 | static void sctp_v6_get_saddr(struct sctp_association *asoc, | |
261 | struct dst_entry *dst, | |
262 | union sctp_addr *daddr, | |
263 | union sctp_addr *saddr) | |
264 | { | |
265 | struct sctp_bind_addr *bp; | |
266 | rwlock_t *addr_lock; | |
267 | struct sctp_sockaddr_entry *laddr; | |
268 | struct list_head *pos; | |
269 | sctp_scope_t scope; | |
270 | union sctp_addr *baddr = NULL; | |
271 | __u8 matchlen = 0; | |
272 | __u8 bmatchlen; | |
273 | ||
274 | SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " | |
275 | "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", | |
276 | __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); | |
277 | ||
278 | if (!asoc) { | |
279 | ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); | |
280 | SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " | |
281 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
282 | NIP6(saddr->v6.sin6_addr)); | |
283 | return; | |
284 | } | |
285 | ||
286 | scope = sctp_scope(daddr); | |
287 | ||
288 | bp = &asoc->base.bind_addr; | |
289 | addr_lock = &asoc->base.addr_lock; | |
290 | ||
291 | /* Go through the bind address list and find the best source address | |
292 | * that matches the scope of the destination address. | |
293 | */ | |
294 | sctp_read_lock(addr_lock); | |
295 | list_for_each(pos, &bp->address_list) { | |
296 | laddr = list_entry(pos, struct sctp_sockaddr_entry, list); | |
297 | if ((laddr->a.sa.sa_family == AF_INET6) && | |
298 | (scope <= sctp_scope(&laddr->a))) { | |
299 | bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); | |
300 | if (!baddr || (matchlen < bmatchlen)) { | |
301 | baddr = &laddr->a; | |
302 | matchlen = bmatchlen; | |
303 | } | |
304 | } | |
305 | } | |
306 | ||
307 | if (baddr) { | |
308 | memcpy(saddr, baddr, sizeof(union sctp_addr)); | |
309 | SCTP_DEBUG_PRINTK("saddr: " | |
310 | "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
311 | NIP6(saddr->v6.sin6_addr)); | |
312 | } else { | |
313 | printk(KERN_ERR "%s: asoc:%p Could not find a valid source " | |
314 | "address for the " | |
315 | "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n", | |
316 | __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); | |
317 | } | |
318 | ||
319 | sctp_read_unlock(addr_lock); | |
320 | } | |
321 | ||
322 | /* Make a copy of all potential local addresses. */ | |
323 | static void sctp_v6_copy_addrlist(struct list_head *addrlist, | |
324 | struct net_device *dev) | |
325 | { | |
326 | struct inet6_dev *in6_dev; | |
327 | struct inet6_ifaddr *ifp; | |
328 | struct sctp_sockaddr_entry *addr; | |
329 | ||
330 | read_lock(&addrconf_lock); | |
331 | if ((in6_dev = __in6_dev_get(dev)) == NULL) { | |
332 | read_unlock(&addrconf_lock); | |
333 | return; | |
334 | } | |
335 | ||
336 | read_lock(&in6_dev->lock); | |
337 | for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { | |
338 | /* Add the address to the local list. */ | |
339 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); | |
340 | if (addr) { | |
341 | addr->a.v6.sin6_family = AF_INET6; | |
342 | addr->a.v6.sin6_port = 0; | |
343 | addr->a.v6.sin6_addr = ifp->addr; | |
344 | addr->a.v6.sin6_scope_id = dev->ifindex; | |
345 | INIT_LIST_HEAD(&addr->list); | |
346 | list_add_tail(&addr->list, addrlist); | |
347 | } | |
348 | } | |
349 | ||
350 | read_unlock(&in6_dev->lock); | |
351 | read_unlock(&addrconf_lock); | |
352 | } | |
353 | ||
354 | /* Initialize a sockaddr_storage from in incoming skb. */ | |
355 | static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, | |
356 | int is_saddr) | |
357 | { | |
358 | void *from; | |
359 | __u16 *port; | |
360 | struct sctphdr *sh; | |
361 | ||
362 | port = &addr->v6.sin6_port; | |
363 | addr->v6.sin6_family = AF_INET6; | |
364 | addr->v6.sin6_flowinfo = 0; /* FIXME */ | |
365 | addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; | |
366 | ||
367 | sh = (struct sctphdr *) skb->h.raw; | |
368 | if (is_saddr) { | |
369 | *port = ntohs(sh->source); | |
370 | from = &skb->nh.ipv6h->saddr; | |
371 | } else { | |
372 | *port = ntohs(sh->dest); | |
373 | from = &skb->nh.ipv6h->daddr; | |
374 | } | |
375 | ipv6_addr_copy(&addr->v6.sin6_addr, from); | |
376 | } | |
377 | ||
378 | /* Initialize an sctp_addr from a socket. */ | |
379 | static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) | |
380 | { | |
381 | addr->v6.sin6_family = AF_INET6; | |
382 | addr->v6.sin6_port = inet_sk(sk)->num; | |
383 | addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; | |
384 | } | |
385 | ||
386 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ | |
387 | static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) | |
388 | { | |
389 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
390 | inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; | |
391 | inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; | |
392 | inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); | |
393 | inet6_sk(sk)->rcv_saddr.s6_addr32[3] = | |
394 | addr->v4.sin_addr.s_addr; | |
395 | } else { | |
396 | inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; | |
397 | } | |
398 | } | |
399 | ||
400 | /* Initialize sk->sk_daddr from sctp_addr. */ | |
401 | static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) | |
402 | { | |
403 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { | |
404 | inet6_sk(sk)->daddr.s6_addr32[0] = 0; | |
405 | inet6_sk(sk)->daddr.s6_addr32[1] = 0; | |
406 | inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); | |
407 | inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; | |
408 | } else { | |
409 | inet6_sk(sk)->daddr = addr->v6.sin6_addr; | |
410 | } | |
411 | } | |
412 | ||
413 | /* Initialize a sctp_addr from an address parameter. */ | |
414 | static void sctp_v6_from_addr_param(union sctp_addr *addr, | |
415 | union sctp_addr_param *param, | |
416 | __u16 port, int iif) | |
417 | { | |
418 | addr->v6.sin6_family = AF_INET6; | |
419 | addr->v6.sin6_port = port; | |
420 | addr->v6.sin6_flowinfo = 0; /* BUG */ | |
421 | ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); | |
422 | addr->v6.sin6_scope_id = iif; | |
423 | } | |
424 | ||
425 | /* Initialize an address parameter from a sctp_addr and return the length | |
426 | * of the address parameter. | |
427 | */ | |
428 | static int sctp_v6_to_addr_param(const union sctp_addr *addr, | |
429 | union sctp_addr_param *param) | |
430 | { | |
431 | int length = sizeof(sctp_ipv6addr_param_t); | |
432 | ||
433 | param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; | |
434 | param->v6.param_hdr.length = ntohs(length); | |
435 | ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); | |
436 | ||
437 | return length; | |
438 | } | |
439 | ||
440 | /* Initialize a sctp_addr from a dst_entry. */ | |
441 | static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, | |
442 | unsigned short port) | |
443 | { | |
444 | struct rt6_info *rt = (struct rt6_info *)dst; | |
445 | addr->sa.sa_family = AF_INET6; | |
446 | addr->v6.sin6_port = port; | |
447 | ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); | |
448 | } | |
449 | ||
450 | /* Compare addresses exactly. | |
451 | * v4-mapped-v6 is also in consideration. | |
452 | */ | |
453 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, | |
454 | const union sctp_addr *addr2) | |
455 | { | |
456 | if (addr1->sa.sa_family != addr2->sa.sa_family) { | |
457 | if (addr1->sa.sa_family == AF_INET && | |
458 | addr2->sa.sa_family == AF_INET6 && | |
459 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { | |
460 | if (addr2->v6.sin6_port == addr1->v4.sin_port && | |
461 | addr2->v6.sin6_addr.s6_addr32[3] == | |
462 | addr1->v4.sin_addr.s_addr) | |
463 | return 1; | |
464 | } | |
465 | if (addr2->sa.sa_family == AF_INET && | |
466 | addr1->sa.sa_family == AF_INET6 && | |
467 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { | |
468 | if (addr1->v6.sin6_port == addr2->v4.sin_port && | |
469 | addr1->v6.sin6_addr.s6_addr32[3] == | |
470 | addr2->v4.sin_addr.s_addr) | |
471 | return 1; | |
472 | } | |
473 | return 0; | |
474 | } | |
475 | if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) | |
476 | return 0; | |
477 | /* If this is a linklocal address, compare the scope_id. */ | |
478 | if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
479 | if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && | |
480 | (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { | |
481 | return 0; | |
482 | } | |
483 | } | |
484 | ||
485 | return 1; | |
486 | } | |
487 | ||
488 | /* Initialize addr struct to INADDR_ANY. */ | |
489 | static void sctp_v6_inaddr_any(union sctp_addr *addr, unsigned short port) | |
490 | { | |
491 | memset(addr, 0x00, sizeof(union sctp_addr)); | |
492 | addr->v6.sin6_family = AF_INET6; | |
493 | addr->v6.sin6_port = port; | |
494 | } | |
495 | ||
496 | /* Is this a wildcard address? */ | |
497 | static int sctp_v6_is_any(const union sctp_addr *addr) | |
498 | { | |
b9b9e10f | 499 | return ipv6_addr_any(&addr->v6.sin6_addr); |
1da177e4 LT |
500 | } |
501 | ||
502 | /* Should this be available for binding? */ | |
503 | static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) | |
504 | { | |
505 | int type; | |
506 | struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; | |
507 | ||
508 | type = ipv6_addr_type(in6); | |
509 | if (IPV6_ADDR_ANY == type) | |
510 | return 1; | |
511 | if (type == IPV6_ADDR_MAPPED) { | |
512 | if (sp && !sp->v4mapped) | |
513 | return 0; | |
514 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
515 | return 0; | |
516 | sctp_v6_map_v4(addr); | |
517 | return sctp_get_af_specific(AF_INET)->available(addr, sp); | |
518 | } | |
519 | if (!(type & IPV6_ADDR_UNICAST)) | |
520 | return 0; | |
521 | ||
522 | return ipv6_chk_addr(in6, NULL, 0); | |
523 | } | |
524 | ||
525 | /* This function checks if the address is a valid address to be used for | |
526 | * SCTP. | |
527 | * | |
528 | * Output: | |
529 | * Return 0 - If the address is a non-unicast or an illegal address. | |
530 | * Return 1 - If the address is a unicast. | |
531 | */ | |
532 | static int sctp_v6_addr_valid(union sctp_addr *addr, struct sctp_sock *sp) | |
533 | { | |
534 | int ret = ipv6_addr_type(&addr->v6.sin6_addr); | |
535 | ||
536 | /* Support v4-mapped-v6 address. */ | |
537 | if (ret == IPV6_ADDR_MAPPED) { | |
538 | /* Note: This routine is used in input, so v4-mapped-v6 | |
539 | * are disallowed here when there is no sctp_sock. | |
540 | */ | |
541 | if (!sp || !sp->v4mapped) | |
542 | return 0; | |
543 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) | |
544 | return 0; | |
545 | sctp_v6_map_v4(addr); | |
546 | return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp); | |
547 | } | |
548 | ||
549 | /* Is this a non-unicast address */ | |
550 | if (!(ret & IPV6_ADDR_UNICAST)) | |
551 | return 0; | |
552 | ||
553 | return 1; | |
554 | } | |
555 | ||
556 | /* What is the scope of 'addr'? */ | |
557 | static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) | |
558 | { | |
559 | int v6scope; | |
560 | sctp_scope_t retval; | |
561 | ||
562 | /* The IPv6 scope is really a set of bit fields. | |
563 | * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. | |
564 | */ | |
565 | ||
566 | v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); | |
567 | switch (v6scope) { | |
568 | case IFA_HOST: | |
569 | retval = SCTP_SCOPE_LOOPBACK; | |
570 | break; | |
571 | case IFA_LINK: | |
572 | retval = SCTP_SCOPE_LINK; | |
573 | break; | |
574 | case IFA_SITE: | |
575 | retval = SCTP_SCOPE_PRIVATE; | |
576 | break; | |
577 | default: | |
578 | retval = SCTP_SCOPE_GLOBAL; | |
579 | break; | |
580 | }; | |
581 | ||
582 | return retval; | |
583 | } | |
584 | ||
585 | /* Create and initialize a new sk for the socket to be returned by accept(). */ | |
586 | static struct sock *sctp_v6_create_accept_sk(struct sock *sk, | |
587 | struct sctp_association *asoc) | |
588 | { | |
589 | struct inet_sock *inet = inet_sk(sk); | |
590 | struct sock *newsk; | |
591 | struct inet_sock *newinet; | |
592 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); | |
593 | struct sctp6_sock *newsctp6sk; | |
594 | ||
595 | newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); | |
596 | if (!newsk) | |
597 | goto out; | |
598 | ||
599 | sock_init_data(NULL, newsk); | |
600 | ||
601 | newsk->sk_type = SOCK_STREAM; | |
602 | ||
603 | newsk->sk_prot = sk->sk_prot; | |
604 | newsk->sk_no_check = sk->sk_no_check; | |
605 | newsk->sk_reuse = sk->sk_reuse; | |
606 | ||
607 | newsk->sk_destruct = inet_sock_destruct; | |
608 | newsk->sk_family = PF_INET6; | |
609 | newsk->sk_protocol = IPPROTO_SCTP; | |
610 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; | |
611 | newsk->sk_shutdown = sk->sk_shutdown; | |
612 | sock_reset_flag(sk, SOCK_ZAPPED); | |
613 | ||
614 | newsctp6sk = (struct sctp6_sock *)newsk; | |
615 | inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; | |
616 | ||
617 | newinet = inet_sk(newsk); | |
618 | newnp = inet6_sk(newsk); | |
619 | ||
620 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); | |
621 | ||
622 | /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() | |
623 | * and getpeername(). | |
624 | */ | |
625 | newinet->sport = inet->sport; | |
626 | newnp->saddr = np->saddr; | |
627 | newnp->rcv_saddr = np->rcv_saddr; | |
628 | newinet->dport = htons(asoc->peer.port); | |
629 | sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); | |
630 | ||
631 | /* Init the ipv4 part of the socket since we can have sockets | |
632 | * using v6 API for ipv4. | |
633 | */ | |
634 | newinet->uc_ttl = -1; | |
635 | newinet->mc_loop = 1; | |
636 | newinet->mc_ttl = 1; | |
637 | newinet->mc_index = 0; | |
638 | newinet->mc_list = NULL; | |
639 | ||
640 | if (ipv4_config.no_pmtu_disc) | |
641 | newinet->pmtudisc = IP_PMTUDISC_DONT; | |
642 | else | |
643 | newinet->pmtudisc = IP_PMTUDISC_WANT; | |
644 | ||
645 | #ifdef INET_REFCNT_DEBUG | |
646 | atomic_inc(&inet6_sock_nr); | |
647 | atomic_inc(&inet_sock_nr); | |
648 | #endif | |
649 | ||
650 | if (newsk->sk_prot->init(newsk)) { | |
651 | sk_common_release(newsk); | |
652 | newsk = NULL; | |
653 | } | |
654 | ||
655 | out: | |
656 | return newsk; | |
657 | } | |
658 | ||
659 | /* Map v4 address to mapped v6 address */ | |
660 | static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) | |
661 | { | |
662 | if (sp->v4mapped && AF_INET == addr->sa.sa_family) | |
663 | sctp_v4_map_v6(addr); | |
664 | } | |
665 | ||
666 | /* Where did this skb come from? */ | |
667 | static int sctp_v6_skb_iif(const struct sk_buff *skb) | |
668 | { | |
669 | struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; | |
670 | return opt->iif; | |
671 | } | |
672 | ||
673 | /* Was this packet marked by Explicit Congestion Notification? */ | |
674 | static int sctp_v6_is_ce(const struct sk_buff *skb) | |
675 | { | |
676 | return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); | |
677 | } | |
678 | ||
679 | /* Dump the v6 addr to the seq file. */ | |
680 | static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) | |
681 | { | |
682 | seq_printf(seq, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ", | |
683 | NIP6(addr->v6.sin6_addr)); | |
684 | } | |
685 | ||
686 | /* Initialize a PF_INET6 socket msg_name. */ | |
687 | static void sctp_inet6_msgname(char *msgname, int *addr_len) | |
688 | { | |
689 | struct sockaddr_in6 *sin6; | |
690 | ||
691 | sin6 = (struct sockaddr_in6 *)msgname; | |
692 | sin6->sin6_family = AF_INET6; | |
693 | sin6->sin6_flowinfo = 0; | |
694 | sin6->sin6_scope_id = 0; /*FIXME */ | |
695 | *addr_len = sizeof(struct sockaddr_in6); | |
696 | } | |
697 | ||
698 | /* Initialize a PF_INET msgname from a ulpevent. */ | |
699 | static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, | |
700 | char *msgname, int *addrlen) | |
701 | { | |
702 | struct sockaddr_in6 *sin6, *sin6from; | |
703 | ||
704 | if (msgname) { | |
705 | union sctp_addr *addr; | |
706 | struct sctp_association *asoc; | |
707 | ||
708 | asoc = event->asoc; | |
709 | sctp_inet6_msgname(msgname, addrlen); | |
710 | sin6 = (struct sockaddr_in6 *)msgname; | |
711 | sin6->sin6_port = htons(asoc->peer.port); | |
712 | addr = &asoc->peer.primary_addr; | |
713 | ||
714 | /* Note: If we go to a common v6 format, this code | |
715 | * will change. | |
716 | */ | |
717 | ||
718 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
719 | if (sctp_sk(asoc->base.sk)->v4mapped && | |
720 | AF_INET == addr->sa.sa_family) { | |
721 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
722 | sin6->sin6_addr.s6_addr32[3] = | |
723 | addr->v4.sin_addr.s_addr; | |
724 | return; | |
725 | } | |
726 | ||
727 | sin6from = &asoc->peer.primary_addr.v6; | |
728 | ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); | |
729 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) | |
730 | sin6->sin6_scope_id = sin6from->sin6_scope_id; | |
731 | } | |
732 | } | |
733 | ||
734 | /* Initialize a msg_name from an inbound skb. */ | |
735 | static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, | |
736 | int *addr_len) | |
737 | { | |
738 | struct sctphdr *sh; | |
739 | struct sockaddr_in6 *sin6; | |
740 | ||
741 | if (msgname) { | |
742 | sctp_inet6_msgname(msgname, addr_len); | |
743 | sin6 = (struct sockaddr_in6 *)msgname; | |
744 | sh = (struct sctphdr *)skb->h.raw; | |
745 | sin6->sin6_port = sh->source; | |
746 | ||
747 | /* Map ipv4 address into v4-mapped-on-v6 address. */ | |
748 | if (sctp_sk(skb->sk)->v4mapped && | |
749 | skb->nh.iph->version == 4) { | |
750 | sctp_v4_map_v6((union sctp_addr *)sin6); | |
751 | sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; | |
752 | return; | |
753 | } | |
754 | ||
755 | /* Otherwise, just copy the v6 address. */ | |
756 | ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); | |
757 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { | |
758 | struct sctp_ulpevent *ev = sctp_skb2event(skb); | |
759 | sin6->sin6_scope_id = ev->iif; | |
760 | } | |
761 | } | |
762 | } | |
763 | ||
764 | /* Do we support this AF? */ | |
765 | static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) | |
766 | { | |
767 | switch (family) { | |
768 | case AF_INET6: | |
769 | return 1; | |
770 | /* v4-mapped-v6 addresses */ | |
771 | case AF_INET: | |
772 | if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) | |
773 | return 1; | |
774 | default: | |
775 | return 0; | |
776 | } | |
777 | } | |
778 | ||
779 | /* Address matching with wildcards allowed. This extra level | |
780 | * of indirection lets us choose whether a PF_INET6 should | |
781 | * disallow any v4 addresses if we so choose. | |
782 | */ | |
783 | static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, | |
784 | const union sctp_addr *addr2, | |
785 | struct sctp_sock *opt) | |
786 | { | |
787 | struct sctp_af *af1, *af2; | |
788 | ||
789 | af1 = sctp_get_af_specific(addr1->sa.sa_family); | |
790 | af2 = sctp_get_af_specific(addr2->sa.sa_family); | |
791 | ||
792 | if (!af1 || !af2) | |
793 | return 0; | |
794 | /* Today, wildcard AF_INET/AF_INET6. */ | |
795 | if (sctp_is_any(addr1) || sctp_is_any(addr2)) | |
796 | return 1; | |
797 | ||
798 | if (addr1->sa.sa_family != addr2->sa.sa_family) | |
799 | return 0; | |
800 | ||
801 | return af1->cmp_addr(addr1, addr2); | |
802 | } | |
803 | ||
804 | /* Verify that the provided sockaddr looks bindable. Common verification, | |
805 | * has already been taken care of. | |
806 | */ | |
807 | static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
808 | { | |
809 | struct sctp_af *af; | |
810 | ||
811 | /* ASSERT: address family has already been verified. */ | |
812 | if (addr->sa.sa_family != AF_INET6) | |
813 | af = sctp_get_af_specific(addr->sa.sa_family); | |
814 | else { | |
815 | struct sock *sk; | |
816 | int type = ipv6_addr_type(&addr->v6.sin6_addr); | |
817 | sk = sctp_opt2sk(opt); | |
818 | if (type & IPV6_ADDR_LINKLOCAL) { | |
819 | /* Note: Behavior similar to af_inet6.c: | |
820 | * 1) Overrides previous bound_dev_if | |
821 | * 2) Destructive even if bind isn't successful. | |
822 | */ | |
823 | ||
824 | if (addr->v6.sin6_scope_id) | |
825 | sk->sk_bound_dev_if = addr->v6.sin6_scope_id; | |
826 | if (!sk->sk_bound_dev_if) | |
827 | return 0; | |
828 | } | |
829 | af = opt->pf->af; | |
830 | } | |
831 | return af->available(addr, opt); | |
832 | } | |
833 | ||
834 | /* Verify that the provided sockaddr looks bindable. Common verification, | |
835 | * has already been taken care of. | |
836 | */ | |
837 | static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) | |
838 | { | |
839 | struct sctp_af *af = NULL; | |
840 | ||
841 | /* ASSERT: address family has already been verified. */ | |
842 | if (addr->sa.sa_family != AF_INET6) | |
843 | af = sctp_get_af_specific(addr->sa.sa_family); | |
844 | else { | |
845 | struct sock *sk; | |
846 | int type = ipv6_addr_type(&addr->v6.sin6_addr); | |
847 | sk = sctp_opt2sk(opt); | |
848 | if (type & IPV6_ADDR_LINKLOCAL) { | |
849 | /* Note: Behavior similar to af_inet6.c: | |
850 | * 1) Overrides previous bound_dev_if | |
851 | * 2) Destructive even if bind isn't successful. | |
852 | */ | |
853 | ||
854 | if (addr->v6.sin6_scope_id) | |
855 | sk->sk_bound_dev_if = addr->v6.sin6_scope_id; | |
856 | if (!sk->sk_bound_dev_if) | |
857 | return 0; | |
858 | } | |
859 | af = opt->pf->af; | |
860 | } | |
861 | ||
862 | return af != NULL; | |
863 | } | |
864 | ||
865 | /* Fill in Supported Address Type information for INIT and INIT-ACK | |
866 | * chunks. Note: In the future, we may want to look at sock options | |
867 | * to determine whether a PF_INET6 socket really wants to have IPV4 | |
868 | * addresses. | |
869 | * Returns number of addresses supported. | |
870 | */ | |
871 | static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, | |
872 | __u16 *types) | |
873 | { | |
874 | types[0] = SCTP_PARAM_IPV4_ADDRESS; | |
875 | types[1] = SCTP_PARAM_IPV6_ADDRESS; | |
876 | return 2; | |
877 | } | |
878 | ||
879 | static struct proto_ops inet6_seqpacket_ops = { | |
880 | .family = PF_INET6, | |
881 | .owner = THIS_MODULE, | |
882 | .release = inet6_release, | |
883 | .bind = inet6_bind, | |
884 | .connect = inet_dgram_connect, | |
885 | .socketpair = sock_no_socketpair, | |
886 | .accept = inet_accept, | |
887 | .getname = inet6_getname, | |
888 | .poll = sctp_poll, | |
889 | .ioctl = inet6_ioctl, | |
890 | .listen = sctp_inet_listen, | |
891 | .shutdown = inet_shutdown, | |
892 | .setsockopt = sock_common_setsockopt, | |
893 | .getsockopt = sock_common_getsockopt, | |
894 | .sendmsg = inet_sendmsg, | |
895 | .recvmsg = sock_common_recvmsg, | |
896 | .mmap = sock_no_mmap, | |
897 | }; | |
898 | ||
899 | static struct inet_protosw sctpv6_seqpacket_protosw = { | |
900 | .type = SOCK_SEQPACKET, | |
901 | .protocol = IPPROTO_SCTP, | |
902 | .prot = &sctpv6_prot, | |
903 | .ops = &inet6_seqpacket_ops, | |
904 | .capability = -1, | |
905 | .no_check = 0, | |
906 | .flags = SCTP_PROTOSW_FLAG | |
907 | }; | |
908 | static struct inet_protosw sctpv6_stream_protosw = { | |
909 | .type = SOCK_STREAM, | |
910 | .protocol = IPPROTO_SCTP, | |
911 | .prot = &sctpv6_prot, | |
912 | .ops = &inet6_seqpacket_ops, | |
913 | .capability = -1, | |
914 | .no_check = 0, | |
915 | .flags = SCTP_PROTOSW_FLAG, | |
916 | }; | |
917 | ||
918 | static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp) | |
919 | { | |
920 | return sctp_rcv(*pskb) ? -1 : 0; | |
921 | } | |
922 | ||
923 | static struct inet6_protocol sctpv6_protocol = { | |
924 | .handler = sctp6_rcv, | |
925 | .err_handler = sctp_v6_err, | |
926 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, | |
927 | }; | |
928 | ||
929 | static struct sctp_af sctp_ipv6_specific = { | |
930 | .sctp_xmit = sctp_v6_xmit, | |
931 | .setsockopt = ipv6_setsockopt, | |
932 | .getsockopt = ipv6_getsockopt, | |
933 | .get_dst = sctp_v6_get_dst, | |
934 | .get_saddr = sctp_v6_get_saddr, | |
935 | .copy_addrlist = sctp_v6_copy_addrlist, | |
936 | .from_skb = sctp_v6_from_skb, | |
937 | .from_sk = sctp_v6_from_sk, | |
938 | .to_sk_saddr = sctp_v6_to_sk_saddr, | |
939 | .to_sk_daddr = sctp_v6_to_sk_daddr, | |
940 | .from_addr_param = sctp_v6_from_addr_param, | |
941 | .to_addr_param = sctp_v6_to_addr_param, | |
942 | .dst_saddr = sctp_v6_dst_saddr, | |
943 | .cmp_addr = sctp_v6_cmp_addr, | |
944 | .scope = sctp_v6_scope, | |
945 | .addr_valid = sctp_v6_addr_valid, | |
946 | .inaddr_any = sctp_v6_inaddr_any, | |
947 | .is_any = sctp_v6_is_any, | |
948 | .available = sctp_v6_available, | |
949 | .skb_iif = sctp_v6_skb_iif, | |
950 | .is_ce = sctp_v6_is_ce, | |
951 | .seq_dump_addr = sctp_v6_seq_dump_addr, | |
952 | .net_header_len = sizeof(struct ipv6hdr), | |
953 | .sockaddr_len = sizeof(struct sockaddr_in6), | |
954 | .sa_family = AF_INET6, | |
955 | }; | |
956 | ||
957 | static struct sctp_pf sctp_pf_inet6_specific = { | |
958 | .event_msgname = sctp_inet6_event_msgname, | |
959 | .skb_msgname = sctp_inet6_skb_msgname, | |
960 | .af_supported = sctp_inet6_af_supported, | |
961 | .cmp_addr = sctp_inet6_cmp_addr, | |
962 | .bind_verify = sctp_inet6_bind_verify, | |
963 | .send_verify = sctp_inet6_send_verify, | |
964 | .supported_addrs = sctp_inet6_supported_addrs, | |
965 | .create_accept_sk = sctp_v6_create_accept_sk, | |
966 | .addr_v4map = sctp_v6_addr_v4map, | |
967 | .af = &sctp_ipv6_specific, | |
968 | }; | |
969 | ||
970 | /* Initialize IPv6 support and register with inet6 stack. */ | |
971 | int sctp_v6_init(void) | |
972 | { | |
973 | int rc = proto_register(&sctpv6_prot, 1); | |
974 | ||
975 | if (rc) | |
976 | goto out; | |
977 | /* Register inet6 protocol. */ | |
978 | rc = -EAGAIN; | |
979 | if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) | |
980 | goto out_unregister_sctp_proto; | |
981 | ||
982 | /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ | |
983 | inet6_register_protosw(&sctpv6_seqpacket_protosw); | |
984 | inet6_register_protosw(&sctpv6_stream_protosw); | |
985 | ||
986 | /* Register the SCTP specific PF_INET6 functions. */ | |
987 | sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); | |
988 | ||
989 | /* Register the SCTP specific AF_INET6 functions. */ | |
990 | sctp_register_af(&sctp_ipv6_specific); | |
991 | ||
992 | /* Register notifier for inet6 address additions/deletions. */ | |
993 | register_inet6addr_notifier(&sctp_inet6addr_notifier); | |
994 | rc = 0; | |
995 | out: | |
996 | return rc; | |
997 | out_unregister_sctp_proto: | |
998 | proto_unregister(&sctpv6_prot); | |
999 | goto out; | |
1000 | } | |
1001 | ||
1002 | /* IPv6 specific exit support. */ | |
1003 | void sctp_v6_exit(void) | |
1004 | { | |
1005 | list_del(&sctp_ipv6_specific.list); | |
1006 | inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); | |
1007 | inet6_unregister_protosw(&sctpv6_seqpacket_protosw); | |
1008 | inet6_unregister_protosw(&sctpv6_stream_protosw); | |
1009 | unregister_inet6addr_notifier(&sctp_inet6addr_notifier); | |
1010 | proto_unregister(&sctpv6_prot); | |
1011 | } |