Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <linux/in.h> |
| 57 | #include <linux/in6.h> |
| 58 | #include <linux/netdevice.h> |
| 59 | #include <linux/init.h> |
| 60 | #include <linux/ipsec.h> |
| 61 | |
| 62 | #include <linux/ipv6.h> |
| 63 | #include <linux/icmpv6.h> |
| 64 | #include <linux/random.h> |
| 65 | #include <linux/seq_file.h> |
| 66 | |
| 67 | #include <net/protocol.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 68 | #include <net/ndisc.h> |
Arnaldo Carvalho de Melo | c752f07 | 2005-08-09 20:08:28 -0700 | [diff] [blame] | 69 | #include <net/ip.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | #include <net/ipv6.h> |
| 71 | #include <net/transp_v6.h> |
| 72 | #include <net/addrconf.h> |
| 73 | #include <net/ip6_route.h> |
| 74 | #include <net/inet_common.h> |
| 75 | #include <net/inet_ecn.h> |
| 76 | #include <net/sctp/sctp.h> |
| 77 | |
| 78 | #include <asm/uaccess.h> |
| 79 | |
Sridhar Samudrala | 29c7cf9 | 2006-12-13 16:26:26 -0800 | [diff] [blame] | 80 | /* Event handler for inet6 address addition/deletion events. */ |
Adrian Bunk | 2412318 | 2006-12-20 16:08:22 -0800 | [diff] [blame] | 81 | static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, |
| 82 | void *ptr) |
Sridhar Samudrala | 29c7cf9 | 2006-12-13 16:26:26 -0800 | [diff] [blame] | 83 | { |
| 84 | struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; |
| 85 | struct sctp_sockaddr_entry *addr; |
| 86 | struct list_head *pos, *temp; |
| 87 | |
| 88 | switch (ev) { |
| 89 | case NETDEV_UP: |
| 90 | addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); |
| 91 | if (addr) { |
| 92 | addr->a.v6.sin6_family = AF_INET6; |
| 93 | addr->a.v6.sin6_port = 0; |
| 94 | memcpy(&addr->a.v6.sin6_addr, &ifa->addr, |
| 95 | sizeof(struct in6_addr)); |
| 96 | addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; |
| 97 | list_add_tail(&addr->list, &sctp_local_addr_list); |
| 98 | } |
| 99 | break; |
| 100 | case NETDEV_DOWN: |
| 101 | list_for_each_safe(pos, temp, &sctp_local_addr_list) { |
| 102 | addr = list_entry(pos, struct sctp_sockaddr_entry, list); |
| 103 | if (ipv6_addr_equal(&addr->a.v6.sin6_addr, &ifa->addr)) { |
| 104 | list_del(pos); |
| 105 | kfree(addr); |
| 106 | break; |
| 107 | } |
| 108 | } |
| 109 | |
| 110 | break; |
| 111 | } |
| 112 | |
| 113 | return NOTIFY_DONE; |
| 114 | } |
| 115 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | static struct notifier_block sctp_inet6addr_notifier = { |
Sridhar Samudrala | 29c7cf9 | 2006-12-13 16:26:26 -0800 | [diff] [blame] | 117 | .notifier_call = sctp_inet6addr_event, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | }; |
| 119 | |
| 120 | /* ICMP error handler. */ |
| 121 | SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
Al Viro | 04ce690 | 2006-11-08 00:21:01 -0800 | [diff] [blame] | 122 | int type, int code, int offset, __be32 info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | { |
| 124 | struct inet6_dev *idev; |
| 125 | struct ipv6hdr *iph = (struct ipv6hdr *)skb->data; |
| 126 | struct sctphdr *sh = (struct sctphdr *)(skb->data + offset); |
| 127 | struct sock *sk; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | struct sctp_association *asoc; |
| 129 | struct sctp_transport *transport; |
| 130 | struct ipv6_pinfo *np; |
| 131 | char *saveip, *savesctp; |
| 132 | int err; |
| 133 | |
| 134 | idev = in6_dev_get(skb->dev); |
| 135 | |
| 136 | /* Fix up skb to look at the embedded net header. */ |
| 137 | saveip = skb->nh.raw; |
| 138 | savesctp = skb->h.raw; |
| 139 | skb->nh.ipv6h = iph; |
| 140 | skb->h.raw = (char *)sh; |
Sridhar Samudrala | d1ad1ff | 2005-07-18 13:44:10 -0700 | [diff] [blame] | 141 | sk = sctp_err_lookup(AF_INET6, skb, sh, &asoc, &transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | /* Put back, the original pointers. */ |
| 143 | skb->nh.raw = saveip; |
| 144 | skb->h.raw = savesctp; |
| 145 | if (!sk) { |
| 146 | ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS); |
| 147 | goto out; |
| 148 | } |
| 149 | |
| 150 | /* Warning: The sock lock is held. Remember to call |
| 151 | * sctp_err_finish! |
| 152 | */ |
| 153 | |
| 154 | switch (type) { |
| 155 | case ICMPV6_PKT_TOOBIG: |
| 156 | sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); |
| 157 | goto out_unlock; |
| 158 | case ICMPV6_PARAMPROB: |
| 159 | if (ICMPV6_UNK_NEXTHDR == code) { |
Sridhar Samudrala | d1ad1ff | 2005-07-18 13:44:10 -0700 | [diff] [blame] | 160 | sctp_icmp_proto_unreachable(sk, asoc, transport); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | goto out_unlock; |
| 162 | } |
| 163 | break; |
| 164 | default: |
| 165 | break; |
| 166 | } |
| 167 | |
| 168 | np = inet6_sk(sk); |
| 169 | icmpv6_err_convert(type, code, &err); |
| 170 | if (!sock_owned_by_user(sk) && np->recverr) { |
| 171 | sk->sk_err = err; |
| 172 | sk->sk_error_report(sk); |
| 173 | } else { /* Only an error on timeout */ |
| 174 | sk->sk_err_soft = err; |
| 175 | } |
| 176 | |
| 177 | out_unlock: |
Sridhar Samudrala | d1ad1ff | 2005-07-18 13:44:10 -0700 | [diff] [blame] | 178 | sctp_err_finish(sk, asoc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | out: |
| 180 | if (likely(idev != NULL)) |
| 181 | in6_dev_put(idev); |
| 182 | } |
| 183 | |
| 184 | /* Based on tcp_v6_xmit() in tcp_ipv6.c. */ |
| 185 | static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport, |
| 186 | int ipfragok) |
| 187 | { |
| 188 | struct sock *sk = skb->sk; |
| 189 | struct ipv6_pinfo *np = inet6_sk(sk); |
| 190 | struct flowi fl; |
| 191 | |
| 192 | memset(&fl, 0, sizeof(fl)); |
| 193 | |
| 194 | fl.proto = sk->sk_protocol; |
| 195 | |
| 196 | /* Fill in the dest address from the route entry passed with the skb |
| 197 | * and the source address from the transport. |
| 198 | */ |
Al Viro | b3f5b3b | 2006-11-20 17:22:43 -0800 | [diff] [blame] | 199 | ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr); |
Al Viro | a926626 | 2006-11-20 17:13:58 -0800 | [diff] [blame] | 200 | ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | |
| 202 | fl.fl6_flowlabel = np->flow_label; |
| 203 | IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel); |
| 204 | if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL) |
Al Viro | a926626 | 2006-11-20 17:13:58 -0800 | [diff] [blame] | 205 | fl.oif = transport->saddr.v6.sin6_scope_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | else |
| 207 | fl.oif = sk->sk_bound_dev_if; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
| 209 | if (np->opt && np->opt->srcrt) { |
| 210 | struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt; |
| 211 | ipv6_addr_copy(&fl.fl6_dst, rt0->addr); |
| 212 | } |
| 213 | |
| 214 | SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, " |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 215 | "src:" NIP6_FMT " dst:" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | __FUNCTION__, skb, skb->len, |
| 217 | NIP6(fl.fl6_src), NIP6(fl.fl6_dst)); |
| 218 | |
| 219 | SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS); |
| 220 | |
| 221 | return ip6_xmit(sk, skb, &fl, np->opt, ipfragok); |
| 222 | } |
| 223 | |
| 224 | /* Returns the dst cache entry for the given source and destination ip |
| 225 | * addresses. |
| 226 | */ |
| 227 | static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc, |
| 228 | union sctp_addr *daddr, |
| 229 | union sctp_addr *saddr) |
| 230 | { |
| 231 | struct dst_entry *dst; |
| 232 | struct flowi fl; |
| 233 | |
| 234 | memset(&fl, 0, sizeof(fl)); |
| 235 | ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr); |
| 236 | if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 237 | fl.oif = daddr->v6.sin6_scope_id; |
YOSHIFUJI Hideaki | d808ad9 | 2007-02-09 23:25:18 +0900 | [diff] [blame] | 238 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 240 | SCTP_DEBUG_PRINTK("%s: DST=" NIP6_FMT " ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | __FUNCTION__, NIP6(fl.fl6_dst)); |
| 242 | |
| 243 | if (saddr) { |
| 244 | ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr); |
| 245 | SCTP_DEBUG_PRINTK( |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 246 | "SRC=" NIP6_FMT " - ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | NIP6(fl.fl6_src)); |
| 248 | } |
| 249 | |
| 250 | dst = ip6_route_output(NULL, &fl); |
Ville Nuorvala | 4251320 | 2006-10-16 22:10:05 -0700 | [diff] [blame] | 251 | if (!dst->error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | struct rt6_info *rt; |
| 253 | rt = (struct rt6_info *)dst; |
| 254 | SCTP_DEBUG_PRINTK( |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 255 | "rt6_dst:" NIP6_FMT " rt6_src:" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr)); |
Ville Nuorvala | 4251320 | 2006-10-16 22:10:05 -0700 | [diff] [blame] | 257 | return dst; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | } |
Ville Nuorvala | 4251320 | 2006-10-16 22:10:05 -0700 | [diff] [blame] | 259 | SCTP_DEBUG_PRINTK("NO ROUTE\n"); |
| 260 | dst_release(dst); |
| 261 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | } |
| 263 | |
| 264 | /* Returns the number of consecutive initial bits that match in the 2 ipv6 |
| 265 | * addresses. |
| 266 | */ |
| 267 | static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
| 268 | union sctp_addr *s2) |
| 269 | { |
| 270 | struct in6_addr *a1 = &s1->v6.sin6_addr; |
| 271 | struct in6_addr *a2 = &s2->v6.sin6_addr; |
| 272 | int i, j; |
| 273 | |
| 274 | for (i = 0; i < 4 ; i++) { |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 275 | __be32 a1xora2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i]; |
| 278 | |
| 279 | if ((j = fls(ntohl(a1xora2)))) |
| 280 | return (i * 32 + 32 - j); |
| 281 | } |
| 282 | |
| 283 | return (i*32); |
| 284 | } |
| 285 | |
| 286 | /* Fills in the source address(saddr) based on the destination address(daddr) |
| 287 | * and asoc's bind address list. |
| 288 | */ |
| 289 | static void sctp_v6_get_saddr(struct sctp_association *asoc, |
| 290 | struct dst_entry *dst, |
| 291 | union sctp_addr *daddr, |
| 292 | union sctp_addr *saddr) |
| 293 | { |
| 294 | struct sctp_bind_addr *bp; |
| 295 | rwlock_t *addr_lock; |
| 296 | struct sctp_sockaddr_entry *laddr; |
| 297 | struct list_head *pos; |
| 298 | sctp_scope_t scope; |
| 299 | union sctp_addr *baddr = NULL; |
| 300 | __u8 matchlen = 0; |
| 301 | __u8 bmatchlen; |
| 302 | |
| 303 | SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p " |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 304 | "daddr:" NIP6_FMT " ", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr)); |
| 306 | |
| 307 | if (!asoc) { |
| 308 | ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr); |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 309 | SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: " NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | NIP6(saddr->v6.sin6_addr)); |
| 311 | return; |
| 312 | } |
| 313 | |
| 314 | scope = sctp_scope(daddr); |
| 315 | |
| 316 | bp = &asoc->base.bind_addr; |
| 317 | addr_lock = &asoc->base.addr_lock; |
| 318 | |
| 319 | /* Go through the bind address list and find the best source address |
| 320 | * that matches the scope of the destination address. |
| 321 | */ |
| 322 | sctp_read_lock(addr_lock); |
| 323 | list_for_each(pos, &bp->address_list) { |
| 324 | laddr = list_entry(pos, struct sctp_sockaddr_entry, list); |
Sridhar Samudrala | dc022a9 | 2006-07-21 14:49:25 -0700 | [diff] [blame] | 325 | if ((laddr->use_as_src) && |
Al Viro | 6244be4 | 2006-11-20 17:21:44 -0800 | [diff] [blame] | 326 | (laddr->a.sa.sa_family == AF_INET6) && |
| 327 | (scope <= sctp_scope(&laddr->a))) { |
Al Viro | d3f7a54 | 2006-11-20 17:12:41 -0800 | [diff] [blame] | 328 | bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | if (!baddr || (matchlen < bmatchlen)) { |
Al Viro | d3f7a54 | 2006-11-20 17:12:41 -0800 | [diff] [blame] | 330 | baddr = &laddr->a; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | matchlen = bmatchlen; |
| 332 | } |
| 333 | } |
| 334 | } |
| 335 | |
| 336 | if (baddr) { |
| 337 | memcpy(saddr, baddr, sizeof(union sctp_addr)); |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 338 | SCTP_DEBUG_PRINTK("saddr: " NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 339 | NIP6(saddr->v6.sin6_addr)); |
| 340 | } else { |
| 341 | printk(KERN_ERR "%s: asoc:%p Could not find a valid source " |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 342 | "address for the dest:" NIP6_FMT "\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr)); |
| 344 | } |
| 345 | |
| 346 | sctp_read_unlock(addr_lock); |
| 347 | } |
| 348 | |
| 349 | /* Make a copy of all potential local addresses. */ |
| 350 | static void sctp_v6_copy_addrlist(struct list_head *addrlist, |
| 351 | struct net_device *dev) |
| 352 | { |
| 353 | struct inet6_dev *in6_dev; |
| 354 | struct inet6_ifaddr *ifp; |
| 355 | struct sctp_sockaddr_entry *addr; |
| 356 | |
YOSHIFUJI Hideaki | 8814c4b | 2006-09-22 14:44:24 -0700 | [diff] [blame] | 357 | rcu_read_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | if ((in6_dev = __in6_dev_get(dev)) == NULL) { |
YOSHIFUJI Hideaki | 8814c4b | 2006-09-22 14:44:24 -0700 | [diff] [blame] | 359 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | return; |
| 361 | } |
| 362 | |
| 363 | read_lock(&in6_dev->lock); |
| 364 | for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) { |
| 365 | /* Add the address to the local list. */ |
| 366 | addr = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC); |
| 367 | if (addr) { |
Al Viro | 2a6fd78 | 2006-11-20 17:04:42 -0800 | [diff] [blame] | 368 | addr->a.v6.sin6_family = AF_INET6; |
| 369 | addr->a.v6.sin6_port = 0; |
| 370 | addr->a.v6.sin6_addr = ifp->addr; |
| 371 | addr->a.v6.sin6_scope_id = dev->ifindex; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 372 | INIT_LIST_HEAD(&addr->list); |
| 373 | list_add_tail(&addr->list, addrlist); |
| 374 | } |
| 375 | } |
| 376 | |
| 377 | read_unlock(&in6_dev->lock); |
YOSHIFUJI Hideaki | 8814c4b | 2006-09-22 14:44:24 -0700 | [diff] [blame] | 378 | rcu_read_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | } |
| 380 | |
| 381 | /* Initialize a sockaddr_storage from in incoming skb. */ |
| 382 | static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb, |
| 383 | int is_saddr) |
| 384 | { |
| 385 | void *from; |
Al Viro | d55c41b | 2006-11-20 17:09:40 -0800 | [diff] [blame] | 386 | __be16 *port; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | struct sctphdr *sh; |
| 388 | |
| 389 | port = &addr->v6.sin6_port; |
| 390 | addr->v6.sin6_family = AF_INET6; |
| 391 | addr->v6.sin6_flowinfo = 0; /* FIXME */ |
| 392 | addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; |
| 393 | |
| 394 | sh = (struct sctphdr *) skb->h.raw; |
| 395 | if (is_saddr) { |
Al Viro | d55c41b | 2006-11-20 17:09:40 -0800 | [diff] [blame] | 396 | *port = sh->source; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | from = &skb->nh.ipv6h->saddr; |
| 398 | } else { |
Al Viro | d55c41b | 2006-11-20 17:09:40 -0800 | [diff] [blame] | 399 | *port = sh->dest; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | from = &skb->nh.ipv6h->daddr; |
| 401 | } |
| 402 | ipv6_addr_copy(&addr->v6.sin6_addr, from); |
| 403 | } |
| 404 | |
| 405 | /* Initialize an sctp_addr from a socket. */ |
| 406 | static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) |
| 407 | { |
| 408 | addr->v6.sin6_family = AF_INET6; |
Al Viro | 7dcdbd9 | 2006-11-20 17:24:21 -0800 | [diff] [blame] | 409 | addr->v6.sin6_port = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr; |
| 411 | } |
| 412 | |
| 413 | /* Initialize sk->sk_rcv_saddr from sctp_addr. */ |
| 414 | static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) |
| 415 | { |
| 416 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { |
| 417 | inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0; |
| 418 | inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0; |
| 419 | inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); |
| 420 | inet6_sk(sk)->rcv_saddr.s6_addr32[3] = |
| 421 | addr->v4.sin_addr.s_addr; |
| 422 | } else { |
| 423 | inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr; |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | /* Initialize sk->sk_daddr from sctp_addr. */ |
| 428 | static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) |
| 429 | { |
| 430 | if (addr->sa.sa_family == AF_INET && sctp_sk(sk)->v4mapped) { |
| 431 | inet6_sk(sk)->daddr.s6_addr32[0] = 0; |
| 432 | inet6_sk(sk)->daddr.s6_addr32[1] = 0; |
| 433 | inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff); |
| 434 | inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
| 435 | } else { |
| 436 | inet6_sk(sk)->daddr = addr->v6.sin6_addr; |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | /* Initialize a sctp_addr from an address parameter. */ |
| 441 | static void sctp_v6_from_addr_param(union sctp_addr *addr, |
| 442 | union sctp_addr_param *param, |
Al Viro | dd86d13 | 2006-11-20 17:11:13 -0800 | [diff] [blame] | 443 | __be16 port, int iif) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | { |
| 445 | addr->v6.sin6_family = AF_INET6; |
| 446 | addr->v6.sin6_port = port; |
| 447 | addr->v6.sin6_flowinfo = 0; /* BUG */ |
| 448 | ipv6_addr_copy(&addr->v6.sin6_addr, ¶m->v6.addr); |
| 449 | addr->v6.sin6_scope_id = iif; |
| 450 | } |
| 451 | |
| 452 | /* Initialize an address parameter from a sctp_addr and return the length |
| 453 | * of the address parameter. |
| 454 | */ |
| 455 | static int sctp_v6_to_addr_param(const union sctp_addr *addr, |
| 456 | union sctp_addr_param *param) |
| 457 | { |
| 458 | int length = sizeof(sctp_ipv6addr_param_t); |
| 459 | |
| 460 | param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; |
Al Viro | dbc16db | 2006-11-20 17:01:42 -0800 | [diff] [blame] | 461 | param->v6.param_hdr.length = htons(length); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | ipv6_addr_copy(¶m->v6.addr, &addr->v6.sin6_addr); |
| 463 | |
| 464 | return length; |
| 465 | } |
| 466 | |
| 467 | /* Initialize a sctp_addr from a dst_entry. */ |
| 468 | static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst, |
Al Viro | 854d43a | 2006-11-20 17:06:24 -0800 | [diff] [blame] | 469 | __be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | { |
| 471 | struct rt6_info *rt = (struct rt6_info *)dst; |
| 472 | addr->sa.sa_family = AF_INET6; |
| 473 | addr->v6.sin6_port = port; |
| 474 | ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr); |
| 475 | } |
| 476 | |
| 477 | /* Compare addresses exactly. |
| 478 | * v4-mapped-v6 is also in consideration. |
| 479 | */ |
| 480 | static int sctp_v6_cmp_addr(const union sctp_addr *addr1, |
| 481 | const union sctp_addr *addr2) |
| 482 | { |
| 483 | if (addr1->sa.sa_family != addr2->sa.sa_family) { |
| 484 | if (addr1->sa.sa_family == AF_INET && |
| 485 | addr2->sa.sa_family == AF_INET6 && |
| 486 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr2->v6.sin6_addr)) { |
| 487 | if (addr2->v6.sin6_port == addr1->v4.sin_port && |
| 488 | addr2->v6.sin6_addr.s6_addr32[3] == |
| 489 | addr1->v4.sin_addr.s_addr) |
| 490 | return 1; |
| 491 | } |
| 492 | if (addr2->sa.sa_family == AF_INET && |
| 493 | addr1->sa.sa_family == AF_INET6 && |
| 494 | IPV6_ADDR_MAPPED == ipv6_addr_type(&addr1->v6.sin6_addr)) { |
| 495 | if (addr1->v6.sin6_port == addr2->v4.sin_port && |
| 496 | addr1->v6.sin6_addr.s6_addr32[3] == |
| 497 | addr2->v4.sin_addr.s_addr) |
| 498 | return 1; |
| 499 | } |
| 500 | return 0; |
| 501 | } |
| 502 | if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) |
| 503 | return 0; |
| 504 | /* If this is a linklocal address, compare the scope_id. */ |
| 505 | if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { |
| 506 | if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && |
| 507 | (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { |
| 508 | return 0; |
| 509 | } |
| 510 | } |
| 511 | |
| 512 | return 1; |
| 513 | } |
| 514 | |
| 515 | /* Initialize addr struct to INADDR_ANY. */ |
Al Viro | 6fbfa9f | 2006-11-20 17:24:53 -0800 | [diff] [blame] | 516 | static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 517 | { |
| 518 | memset(addr, 0x00, sizeof(union sctp_addr)); |
| 519 | addr->v6.sin6_family = AF_INET6; |
| 520 | addr->v6.sin6_port = port; |
| 521 | } |
| 522 | |
| 523 | /* Is this a wildcard address? */ |
| 524 | static int sctp_v6_is_any(const union sctp_addr *addr) |
| 525 | { |
Brian Haley | b9b9e10 | 2005-04-28 11:59:16 -0700 | [diff] [blame] | 526 | return ipv6_addr_any(&addr->v6.sin6_addr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | } |
| 528 | |
| 529 | /* Should this be available for binding? */ |
| 530 | static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) |
| 531 | { |
| 532 | int type; |
| 533 | struct in6_addr *in6 = (struct in6_addr *)&addr->v6.sin6_addr; |
| 534 | |
| 535 | type = ipv6_addr_type(in6); |
| 536 | if (IPV6_ADDR_ANY == type) |
| 537 | return 1; |
| 538 | if (type == IPV6_ADDR_MAPPED) { |
| 539 | if (sp && !sp->v4mapped) |
| 540 | return 0; |
| 541 | if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
| 542 | return 0; |
| 543 | sctp_v6_map_v4(addr); |
| 544 | return sctp_get_af_specific(AF_INET)->available(addr, sp); |
| 545 | } |
| 546 | if (!(type & IPV6_ADDR_UNICAST)) |
| 547 | return 0; |
| 548 | |
| 549 | return ipv6_chk_addr(in6, NULL, 0); |
| 550 | } |
| 551 | |
| 552 | /* This function checks if the address is a valid address to be used for |
| 553 | * SCTP. |
| 554 | * |
| 555 | * Output: |
| 556 | * Return 0 - If the address is a non-unicast or an illegal address. |
| 557 | * Return 1 - If the address is a unicast. |
| 558 | */ |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 559 | static int sctp_v6_addr_valid(union sctp_addr *addr, |
| 560 | struct sctp_sock *sp, |
| 561 | const struct sk_buff *skb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | { |
| 563 | int ret = ipv6_addr_type(&addr->v6.sin6_addr); |
| 564 | |
| 565 | /* Support v4-mapped-v6 address. */ |
| 566 | if (ret == IPV6_ADDR_MAPPED) { |
| 567 | /* Note: This routine is used in input, so v4-mapped-v6 |
| 568 | * are disallowed here when there is no sctp_sock. |
| 569 | */ |
| 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); |
Vlad Yasevich | 5636bef | 2006-06-17 22:55:35 -0700 | [diff] [blame] | 575 | return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | } |
| 577 | |
| 578 | /* Is this a non-unicast address */ |
| 579 | if (!(ret & IPV6_ADDR_UNICAST)) |
| 580 | return 0; |
| 581 | |
| 582 | return 1; |
| 583 | } |
| 584 | |
| 585 | /* What is the scope of 'addr'? */ |
| 586 | static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) |
| 587 | { |
| 588 | int v6scope; |
| 589 | sctp_scope_t retval; |
| 590 | |
| 591 | /* The IPv6 scope is really a set of bit fields. |
| 592 | * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. |
| 593 | */ |
| 594 | |
| 595 | v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); |
| 596 | switch (v6scope) { |
| 597 | case IFA_HOST: |
| 598 | retval = SCTP_SCOPE_LOOPBACK; |
| 599 | break; |
| 600 | case IFA_LINK: |
| 601 | retval = SCTP_SCOPE_LINK; |
| 602 | break; |
| 603 | case IFA_SITE: |
| 604 | retval = SCTP_SCOPE_PRIVATE; |
| 605 | break; |
| 606 | default: |
| 607 | retval = SCTP_SCOPE_GLOBAL; |
| 608 | break; |
| 609 | }; |
| 610 | |
| 611 | return retval; |
| 612 | } |
| 613 | |
| 614 | /* Create and initialize a new sk for the socket to be returned by accept(). */ |
| 615 | static struct sock *sctp_v6_create_accept_sk(struct sock *sk, |
| 616 | struct sctp_association *asoc) |
| 617 | { |
| 618 | struct inet_sock *inet = inet_sk(sk); |
| 619 | struct sock *newsk; |
| 620 | struct inet_sock *newinet; |
| 621 | struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| 622 | struct sctp6_sock *newsctp6sk; |
| 623 | |
| 624 | newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1); |
| 625 | if (!newsk) |
| 626 | goto out; |
| 627 | |
| 628 | sock_init_data(NULL, newsk); |
| 629 | |
| 630 | newsk->sk_type = SOCK_STREAM; |
| 631 | |
| 632 | newsk->sk_prot = sk->sk_prot; |
| 633 | newsk->sk_no_check = sk->sk_no_check; |
| 634 | newsk->sk_reuse = sk->sk_reuse; |
| 635 | |
| 636 | newsk->sk_destruct = inet_sock_destruct; |
| 637 | newsk->sk_family = PF_INET6; |
| 638 | newsk->sk_protocol = IPPROTO_SCTP; |
| 639 | newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv; |
| 640 | newsk->sk_shutdown = sk->sk_shutdown; |
| 641 | sock_reset_flag(sk, SOCK_ZAPPED); |
| 642 | |
| 643 | newsctp6sk = (struct sctp6_sock *)newsk; |
| 644 | inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; |
| 645 | |
| 646 | newinet = inet_sk(newsk); |
| 647 | newnp = inet6_sk(newsk); |
| 648 | |
| 649 | memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| 650 | |
| 651 | /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() |
| 652 | * and getpeername(). |
| 653 | */ |
| 654 | newinet->sport = inet->sport; |
| 655 | newnp->saddr = np->saddr; |
| 656 | newnp->rcv_saddr = np->rcv_saddr; |
| 657 | newinet->dport = htons(asoc->peer.port); |
| 658 | sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); |
| 659 | |
| 660 | /* Init the ipv4 part of the socket since we can have sockets |
| 661 | * using v6 API for ipv4. |
| 662 | */ |
| 663 | newinet->uc_ttl = -1; |
| 664 | newinet->mc_loop = 1; |
| 665 | newinet->mc_ttl = 1; |
| 666 | newinet->mc_index = 0; |
| 667 | newinet->mc_list = NULL; |
| 668 | |
| 669 | if (ipv4_config.no_pmtu_disc) |
| 670 | newinet->pmtudisc = IP_PMTUDISC_DONT; |
| 671 | else |
| 672 | newinet->pmtudisc = IP_PMTUDISC_WANT; |
| 673 | |
Arnaldo Carvalho de Melo | e684897 | 2005-08-09 19:45:38 -0700 | [diff] [blame] | 674 | sk_refcnt_debug_inc(newsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | |
| 676 | if (newsk->sk_prot->init(newsk)) { |
| 677 | sk_common_release(newsk); |
| 678 | newsk = NULL; |
| 679 | } |
| 680 | |
| 681 | out: |
| 682 | return newsk; |
| 683 | } |
| 684 | |
| 685 | /* Map v4 address to mapped v6 address */ |
| 686 | static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr) |
| 687 | { |
| 688 | if (sp->v4mapped && AF_INET == addr->sa.sa_family) |
| 689 | sctp_v4_map_v6(addr); |
| 690 | } |
| 691 | |
| 692 | /* Where did this skb come from? */ |
| 693 | static int sctp_v6_skb_iif(const struct sk_buff *skb) |
| 694 | { |
| 695 | struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; |
| 696 | return opt->iif; |
| 697 | } |
| 698 | |
| 699 | /* Was this packet marked by Explicit Congestion Notification? */ |
| 700 | static int sctp_v6_is_ce(const struct sk_buff *skb) |
| 701 | { |
| 702 | return *((__u32 *)(skb->nh.ipv6h)) & htonl(1<<20); |
| 703 | } |
| 704 | |
| 705 | /* Dump the v6 addr to the seq file. */ |
| 706 | static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) |
| 707 | { |
Joe Perches | 46b86a2 | 2006-01-13 14:29:07 -0800 | [diff] [blame] | 708 | seq_printf(seq, NIP6_FMT " ", NIP6(addr->v6.sin6_addr)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | } |
| 710 | |
| 711 | /* Initialize a PF_INET6 socket msg_name. */ |
| 712 | static void sctp_inet6_msgname(char *msgname, int *addr_len) |
| 713 | { |
| 714 | struct sockaddr_in6 *sin6; |
| 715 | |
| 716 | sin6 = (struct sockaddr_in6 *)msgname; |
| 717 | sin6->sin6_family = AF_INET6; |
| 718 | sin6->sin6_flowinfo = 0; |
| 719 | sin6->sin6_scope_id = 0; /*FIXME */ |
| 720 | *addr_len = sizeof(struct sockaddr_in6); |
| 721 | } |
| 722 | |
| 723 | /* Initialize a PF_INET msgname from a ulpevent. */ |
| 724 | static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, |
| 725 | char *msgname, int *addrlen) |
| 726 | { |
| 727 | struct sockaddr_in6 *sin6, *sin6from; |
| 728 | |
| 729 | if (msgname) { |
| 730 | union sctp_addr *addr; |
| 731 | struct sctp_association *asoc; |
| 732 | |
| 733 | asoc = event->asoc; |
| 734 | sctp_inet6_msgname(msgname, addrlen); |
| 735 | sin6 = (struct sockaddr_in6 *)msgname; |
| 736 | sin6->sin6_port = htons(asoc->peer.port); |
| 737 | addr = &asoc->peer.primary_addr; |
| 738 | |
| 739 | /* Note: If we go to a common v6 format, this code |
| 740 | * will change. |
| 741 | */ |
| 742 | |
| 743 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
| 744 | if (sctp_sk(asoc->base.sk)->v4mapped && |
| 745 | AF_INET == addr->sa.sa_family) { |
| 746 | sctp_v4_map_v6((union sctp_addr *)sin6); |
| 747 | sin6->sin6_addr.s6_addr32[3] = |
| 748 | addr->v4.sin_addr.s_addr; |
| 749 | return; |
| 750 | } |
| 751 | |
| 752 | sin6from = &asoc->peer.primary_addr.v6; |
| 753 | ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr); |
| 754 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| 755 | sin6->sin6_scope_id = sin6from->sin6_scope_id; |
| 756 | } |
| 757 | } |
| 758 | |
| 759 | /* Initialize a msg_name from an inbound skb. */ |
| 760 | static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, |
| 761 | int *addr_len) |
| 762 | { |
| 763 | struct sctphdr *sh; |
| 764 | struct sockaddr_in6 *sin6; |
| 765 | |
| 766 | if (msgname) { |
| 767 | sctp_inet6_msgname(msgname, addr_len); |
| 768 | sin6 = (struct sockaddr_in6 *)msgname; |
| 769 | sh = (struct sctphdr *)skb->h.raw; |
| 770 | sin6->sin6_port = sh->source; |
| 771 | |
| 772 | /* Map ipv4 address into v4-mapped-on-v6 address. */ |
| 773 | if (sctp_sk(skb->sk)->v4mapped && |
| 774 | skb->nh.iph->version == 4) { |
| 775 | sctp_v4_map_v6((union sctp_addr *)sin6); |
| 776 | sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr; |
| 777 | return; |
| 778 | } |
| 779 | |
| 780 | /* Otherwise, just copy the v6 address. */ |
| 781 | ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr); |
| 782 | if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) { |
| 783 | struct sctp_ulpevent *ev = sctp_skb2event(skb); |
| 784 | sin6->sin6_scope_id = ev->iif; |
| 785 | } |
| 786 | } |
| 787 | } |
| 788 | |
| 789 | /* Do we support this AF? */ |
| 790 | static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) |
| 791 | { |
| 792 | switch (family) { |
| 793 | case AF_INET6: |
| 794 | return 1; |
| 795 | /* v4-mapped-v6 addresses */ |
| 796 | case AF_INET: |
| 797 | if (!__ipv6_only_sock(sctp_opt2sk(sp)) && sp->v4mapped) |
| 798 | return 1; |
| 799 | default: |
| 800 | return 0; |
| 801 | } |
| 802 | } |
| 803 | |
| 804 | /* Address matching with wildcards allowed. This extra level |
| 805 | * of indirection lets us choose whether a PF_INET6 should |
| 806 | * disallow any v4 addresses if we so choose. |
| 807 | */ |
| 808 | static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, |
| 809 | const union sctp_addr *addr2, |
| 810 | struct sctp_sock *opt) |
| 811 | { |
| 812 | struct sctp_af *af1, *af2; |
| 813 | |
| 814 | af1 = sctp_get_af_specific(addr1->sa.sa_family); |
| 815 | af2 = sctp_get_af_specific(addr2->sa.sa_family); |
| 816 | |
| 817 | if (!af1 || !af2) |
| 818 | return 0; |
| 819 | /* Today, wildcard AF_INET/AF_INET6. */ |
| 820 | if (sctp_is_any(addr1) || sctp_is_any(addr2)) |
| 821 | return 1; |
| 822 | |
| 823 | if (addr1->sa.sa_family != addr2->sa.sa_family) |
| 824 | return 0; |
| 825 | |
| 826 | return af1->cmp_addr(addr1, addr2); |
| 827 | } |
| 828 | |
| 829 | /* Verify that the provided sockaddr looks bindable. Common verification, |
| 830 | * has already been taken care of. |
| 831 | */ |
| 832 | static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 833 | { |
| 834 | struct sctp_af *af; |
| 835 | |
| 836 | /* ASSERT: address family has already been verified. */ |
| 837 | if (addr->sa.sa_family != AF_INET6) |
| 838 | af = sctp_get_af_specific(addr->sa.sa_family); |
| 839 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | int type = ipv6_addr_type(&addr->v6.sin6_addr); |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 841 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 843 | if (type & IPV6_ADDR_LINKLOCAL) { |
| 844 | if (!addr->v6.sin6_scope_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 845 | return 0; |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 846 | dev = dev_get_by_index(addr->v6.sin6_scope_id); |
| 847 | if (!dev) |
| 848 | return 0; |
| 849 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 850 | } |
| 851 | af = opt->pf->af; |
| 852 | } |
| 853 | return af->available(addr, opt); |
| 854 | } |
| 855 | |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 856 | /* Verify that the provided sockaddr looks sendable. Common verification, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 857 | * has already been taken care of. |
| 858 | */ |
| 859 | static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| 860 | { |
| 861 | struct sctp_af *af = NULL; |
| 862 | |
| 863 | /* ASSERT: address family has already been verified. */ |
| 864 | if (addr->sa.sa_family != AF_INET6) |
| 865 | af = sctp_get_af_specific(addr->sa.sa_family); |
| 866 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | int type = ipv6_addr_type(&addr->v6.sin6_addr); |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 868 | struct net_device *dev; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 869 | |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 870 | if (type & IPV6_ADDR_LINKLOCAL) { |
| 871 | if (!addr->v6.sin6_scope_id) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | return 0; |
Sridhar Samudrala | 6a6ddb2 | 2005-06-13 15:13:05 -0700 | [diff] [blame] | 873 | dev = dev_get_by_index(addr->v6.sin6_scope_id); |
| 874 | if (!dev) |
| 875 | return 0; |
| 876 | dev_put(dev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 877 | } |
| 878 | af = opt->pf->af; |
| 879 | } |
| 880 | |
| 881 | return af != NULL; |
| 882 | } |
| 883 | |
| 884 | /* Fill in Supported Address Type information for INIT and INIT-ACK |
| 885 | * chunks. Note: In the future, we may want to look at sock options |
| 886 | * to determine whether a PF_INET6 socket really wants to have IPV4 |
| 887 | * addresses. |
| 888 | * Returns number of addresses supported. |
| 889 | */ |
| 890 | static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, |
Al Viro | 3dbe865 | 2006-11-20 17:25:49 -0800 | [diff] [blame] | 891 | __be16 *types) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 892 | { |
| 893 | types[0] = SCTP_PARAM_IPV4_ADDRESS; |
| 894 | types[1] = SCTP_PARAM_IPV6_ADDRESS; |
| 895 | return 2; |
| 896 | } |
| 897 | |
Eric Dumazet | 90ddc4f | 2005-12-22 12:49:22 -0800 | [diff] [blame] | 898 | static const struct proto_ops inet6_seqpacket_ops = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 899 | .family = PF_INET6, |
| 900 | .owner = THIS_MODULE, |
| 901 | .release = inet6_release, |
| 902 | .bind = inet6_bind, |
| 903 | .connect = inet_dgram_connect, |
| 904 | .socketpair = sock_no_socketpair, |
| 905 | .accept = inet_accept, |
| 906 | .getname = inet6_getname, |
| 907 | .poll = sctp_poll, |
| 908 | .ioctl = inet6_ioctl, |
| 909 | .listen = sctp_inet_listen, |
| 910 | .shutdown = inet_shutdown, |
| 911 | .setsockopt = sock_common_setsockopt, |
| 912 | .getsockopt = sock_common_getsockopt, |
| 913 | .sendmsg = inet_sendmsg, |
| 914 | .recvmsg = sock_common_recvmsg, |
| 915 | .mmap = sock_no_mmap, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 916 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 917 | .compat_setsockopt = compat_sock_common_setsockopt, |
| 918 | .compat_getsockopt = compat_sock_common_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 919 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | }; |
| 921 | |
| 922 | static struct inet_protosw sctpv6_seqpacket_protosw = { |
| 923 | .type = SOCK_SEQPACKET, |
| 924 | .protocol = IPPROTO_SCTP, |
| 925 | .prot = &sctpv6_prot, |
| 926 | .ops = &inet6_seqpacket_ops, |
| 927 | .capability = -1, |
| 928 | .no_check = 0, |
| 929 | .flags = SCTP_PROTOSW_FLAG |
| 930 | }; |
| 931 | static struct inet_protosw sctpv6_stream_protosw = { |
| 932 | .type = SOCK_STREAM, |
| 933 | .protocol = IPPROTO_SCTP, |
| 934 | .prot = &sctpv6_prot, |
| 935 | .ops = &inet6_seqpacket_ops, |
| 936 | .capability = -1, |
| 937 | .no_check = 0, |
| 938 | .flags = SCTP_PROTOSW_FLAG, |
| 939 | }; |
| 940 | |
Patrick McHardy | 951dbc8 | 2006-01-06 23:02:34 -0800 | [diff] [blame] | 941 | static int sctp6_rcv(struct sk_buff **pskb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 942 | { |
| 943 | return sctp_rcv(*pskb) ? -1 : 0; |
| 944 | } |
| 945 | |
| 946 | static struct inet6_protocol sctpv6_protocol = { |
| 947 | .handler = sctp6_rcv, |
| 948 | .err_handler = sctp_v6_err, |
| 949 | .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
| 950 | }; |
| 951 | |
| 952 | static struct sctp_af sctp_ipv6_specific = { |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 953 | .sa_family = AF_INET6, |
| 954 | .sctp_xmit = sctp_v6_xmit, |
| 955 | .setsockopt = ipv6_setsockopt, |
| 956 | .getsockopt = ipv6_getsockopt, |
| 957 | .get_dst = sctp_v6_get_dst, |
| 958 | .get_saddr = sctp_v6_get_saddr, |
| 959 | .copy_addrlist = sctp_v6_copy_addrlist, |
| 960 | .from_skb = sctp_v6_from_skb, |
| 961 | .from_sk = sctp_v6_from_sk, |
| 962 | .to_sk_saddr = sctp_v6_to_sk_saddr, |
| 963 | .to_sk_daddr = sctp_v6_to_sk_daddr, |
| 964 | .from_addr_param = sctp_v6_from_addr_param, |
| 965 | .to_addr_param = sctp_v6_to_addr_param, |
| 966 | .dst_saddr = sctp_v6_dst_saddr, |
| 967 | .cmp_addr = sctp_v6_cmp_addr, |
| 968 | .scope = sctp_v6_scope, |
| 969 | .addr_valid = sctp_v6_addr_valid, |
| 970 | .inaddr_any = sctp_v6_inaddr_any, |
| 971 | .is_any = sctp_v6_is_any, |
| 972 | .available = sctp_v6_available, |
| 973 | .skb_iif = sctp_v6_skb_iif, |
| 974 | .is_ce = sctp_v6_is_ce, |
| 975 | .seq_dump_addr = sctp_v6_seq_dump_addr, |
| 976 | .net_header_len = sizeof(struct ipv6hdr), |
| 977 | .sockaddr_len = sizeof(struct sockaddr_in6), |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 978 | #ifdef CONFIG_COMPAT |
Arnaldo Carvalho de Melo | 543d9cf | 2006-03-20 22:48:35 -0800 | [diff] [blame] | 979 | .compat_setsockopt = compat_ipv6_setsockopt, |
| 980 | .compat_getsockopt = compat_ipv6_getsockopt, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 981 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | }; |
| 983 | |
| 984 | static struct sctp_pf sctp_pf_inet6_specific = { |
| 985 | .event_msgname = sctp_inet6_event_msgname, |
| 986 | .skb_msgname = sctp_inet6_skb_msgname, |
| 987 | .af_supported = sctp_inet6_af_supported, |
| 988 | .cmp_addr = sctp_inet6_cmp_addr, |
| 989 | .bind_verify = sctp_inet6_bind_verify, |
| 990 | .send_verify = sctp_inet6_send_verify, |
| 991 | .supported_addrs = sctp_inet6_supported_addrs, |
| 992 | .create_accept_sk = sctp_v6_create_accept_sk, |
| 993 | .addr_v4map = sctp_v6_addr_v4map, |
| 994 | .af = &sctp_ipv6_specific, |
| 995 | }; |
| 996 | |
| 997 | /* Initialize IPv6 support and register with inet6 stack. */ |
| 998 | int sctp_v6_init(void) |
| 999 | { |
| 1000 | int rc = proto_register(&sctpv6_prot, 1); |
| 1001 | |
| 1002 | if (rc) |
| 1003 | goto out; |
| 1004 | /* Register inet6 protocol. */ |
| 1005 | rc = -EAGAIN; |
| 1006 | if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) |
| 1007 | goto out_unregister_sctp_proto; |
| 1008 | |
| 1009 | /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ |
| 1010 | inet6_register_protosw(&sctpv6_seqpacket_protosw); |
| 1011 | inet6_register_protosw(&sctpv6_stream_protosw); |
| 1012 | |
| 1013 | /* Register the SCTP specific PF_INET6 functions. */ |
| 1014 | sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6); |
| 1015 | |
| 1016 | /* Register the SCTP specific AF_INET6 functions. */ |
| 1017 | sctp_register_af(&sctp_ipv6_specific); |
| 1018 | |
| 1019 | /* Register notifier for inet6 address additions/deletions. */ |
| 1020 | register_inet6addr_notifier(&sctp_inet6addr_notifier); |
| 1021 | rc = 0; |
| 1022 | out: |
| 1023 | return rc; |
| 1024 | out_unregister_sctp_proto: |
| 1025 | proto_unregister(&sctpv6_prot); |
| 1026 | goto out; |
| 1027 | } |
| 1028 | |
| 1029 | /* IPv6 specific exit support. */ |
| 1030 | void sctp_v6_exit(void) |
| 1031 | { |
| 1032 | list_del(&sctp_ipv6_specific.list); |
| 1033 | inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); |
| 1034 | inet6_unregister_protosw(&sctpv6_seqpacket_protosw); |
| 1035 | inet6_unregister_protosw(&sctpv6_stream_protosw); |
| 1036 | unregister_inet6addr_notifier(&sctp_inet6addr_notifier); |
| 1037 | proto_unregister(&sctpv6_prot); |
| 1038 | } |