| /* SCTP kernel implementation |
| * (C) Copyright IBM Corp. 2002, 2004 |
| * Copyright (c) 2001 Nokia, Inc. |
| * Copyright (c) 2001 La Monte H.P. Yarroll |
| * Copyright (c) 2002-2003 Intel Corp. |
| * |
| * This file is part of the SCTP kernel implementation |
| * |
| * SCTP over IPv6. |
| * |
| * This SCTP implementation is free software; |
| * you can redistribute it and/or modify it under the terms of |
| * the GNU General Public License as published by |
| * the Free Software Foundation; either version 2, or (at your option) |
| * any later version. |
| * |
| * This SCTP implementation is distributed in the hope that it |
| * will be useful, but WITHOUT ANY WARRANTY; without even the implied |
| * ************************ |
| * warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. |
| * See the GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with GNU CC; see the file COPYING. If not, see |
| * <http://www.gnu.org/licenses/>. |
| * |
| * Please send any bug reports or fixes you make to the |
| * email address(es): |
| * lksctp developers <linux-sctp@vger.kernel.org> |
| * |
| * Written or modified by: |
| * Le Yanqun <yanqun.le@nokia.com> |
| * Hui Huang <hui.huang@nokia.com> |
| * La Monte H.P. Yarroll <piggy@acm.org> |
| * Sridhar Samudrala <sri@us.ibm.com> |
| * Jon Grimm <jgrimm@us.ibm.com> |
| * Ardelle Fan <ardelle.fan@intel.com> |
| * |
| * Based on: |
| * linux/net/ipv6/tcp_ipv6.c |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/module.h> |
| #include <linux/errno.h> |
| #include <linux/types.h> |
| #include <linux/socket.h> |
| #include <linux/sockios.h> |
| #include <linux/net.h> |
| #include <linux/in.h> |
| #include <linux/in6.h> |
| #include <linux/netdevice.h> |
| #include <linux/init.h> |
| #include <linux/ipsec.h> |
| #include <linux/slab.h> |
| |
| #include <linux/ipv6.h> |
| #include <linux/icmpv6.h> |
| #include <linux/random.h> |
| #include <linux/seq_file.h> |
| |
| #include <net/protocol.h> |
| #include <net/ndisc.h> |
| #include <net/ip.h> |
| #include <net/ipv6.h> |
| #include <net/transp_v6.h> |
| #include <net/addrconf.h> |
| #include <net/ip6_route.h> |
| #include <net/inet_common.h> |
| #include <net/inet_ecn.h> |
| #include <net/sctp/sctp.h> |
| |
| #include <asm/uaccess.h> |
| |
| static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
| union sctp_addr *s2); |
| static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, |
| __be16 port); |
| static int sctp_v6_cmp_addr(const union sctp_addr *addr1, |
| const union sctp_addr *addr2); |
| |
| /* Event handler for inet6 address addition/deletion events. |
| * The sctp_local_addr_list needs to be protocted by a spin lock since |
| * multiple notifiers (say IPv4 and IPv6) may be running at the same |
| * time and thus corrupt the list. |
| * The reader side is protected with RCU. |
| */ |
| static int sctp_inet6addr_event(struct notifier_block *this, unsigned long ev, |
| void *ptr) |
| { |
| struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)ptr; |
| struct sctp_sockaddr_entry *addr = NULL; |
| struct sctp_sockaddr_entry *temp; |
| struct net *net = dev_net(ifa->idev->dev); |
| int found = 0; |
| |
| switch (ev) { |
| case NETDEV_UP: |
| addr = kmalloc(sizeof(struct sctp_sockaddr_entry), GFP_ATOMIC); |
| if (addr) { |
| addr->a.v6.sin6_family = AF_INET6; |
| addr->a.v6.sin6_port = 0; |
| addr->a.v6.sin6_addr = ifa->addr; |
| addr->a.v6.sin6_scope_id = ifa->idev->dev->ifindex; |
| addr->valid = 1; |
| spin_lock_bh(&net->sctp.local_addr_lock); |
| list_add_tail_rcu(&addr->list, &net->sctp.local_addr_list); |
| sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_NEW); |
| spin_unlock_bh(&net->sctp.local_addr_lock); |
| } |
| break; |
| case NETDEV_DOWN: |
| spin_lock_bh(&net->sctp.local_addr_lock); |
| list_for_each_entry_safe(addr, temp, |
| &net->sctp.local_addr_list, list) { |
| if (addr->a.sa.sa_family == AF_INET6 && |
| ipv6_addr_equal(&addr->a.v6.sin6_addr, |
| &ifa->addr)) { |
| sctp_addr_wq_mgmt(net, addr, SCTP_ADDR_DEL); |
| found = 1; |
| addr->valid = 0; |
| list_del_rcu(&addr->list); |
| break; |
| } |
| } |
| spin_unlock_bh(&net->sctp.local_addr_lock); |
| if (found) |
| kfree_rcu(addr, rcu); |
| break; |
| } |
| |
| return NOTIFY_DONE; |
| } |
| |
| static struct notifier_block sctp_inet6addr_notifier = { |
| .notifier_call = sctp_inet6addr_event, |
| }; |
| |
| /* ICMP error handler. */ |
| static void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt, |
| u8 type, u8 code, int offset, __be32 info) |
| { |
| struct inet6_dev *idev; |
| struct sock *sk; |
| struct sctp_association *asoc; |
| struct sctp_transport *transport; |
| struct ipv6_pinfo *np; |
| __u16 saveip, savesctp; |
| int err; |
| struct net *net = dev_net(skb->dev); |
| |
| idev = in6_dev_get(skb->dev); |
| |
| /* Fix up skb to look at the embedded net header. */ |
| saveip = skb->network_header; |
| savesctp = skb->transport_header; |
| skb_reset_network_header(skb); |
| skb_set_transport_header(skb, offset); |
| sk = sctp_err_lookup(net, AF_INET6, skb, sctp_hdr(skb), &asoc, &transport); |
| /* Put back, the original pointers. */ |
| skb->network_header = saveip; |
| skb->transport_header = savesctp; |
| if (!sk) { |
| ICMP6_INC_STATS_BH(net, idev, ICMP6_MIB_INERRORS); |
| goto out; |
| } |
| |
| /* Warning: The sock lock is held. Remember to call |
| * sctp_err_finish! |
| */ |
| |
| switch (type) { |
| case ICMPV6_PKT_TOOBIG: |
| if (ip6_sk_accept_pmtu(sk)) |
| sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info)); |
| goto out_unlock; |
| case ICMPV6_PARAMPROB: |
| if (ICMPV6_UNK_NEXTHDR == code) { |
| sctp_icmp_proto_unreachable(sk, asoc, transport); |
| goto out_unlock; |
| } |
| break; |
| case NDISC_REDIRECT: |
| sctp_icmp_redirect(sk, transport, skb); |
| goto out_unlock; |
| default: |
| break; |
| } |
| |
| np = inet6_sk(sk); |
| icmpv6_err_convert(type, code, &err); |
| if (!sock_owned_by_user(sk) && np->recverr) { |
| sk->sk_err = err; |
| sk->sk_error_report(sk); |
| } else { /* Only an error on timeout */ |
| sk->sk_err_soft = err; |
| } |
| |
| out_unlock: |
| sctp_err_finish(sk, asoc); |
| out: |
| if (likely(idev != NULL)) |
| in6_dev_put(idev); |
| } |
| |
| static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport) |
| { |
| struct sock *sk = skb->sk; |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct flowi6 *fl6 = &transport->fl.u.ip6; |
| int res; |
| |
| pr_debug("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n", __func__, skb, |
| skb->len, &fl6->saddr, &fl6->daddr); |
| |
| IP6_ECN_flow_xmit(sk, fl6->flowlabel); |
| |
| if (!(transport->param_flags & SPP_PMTUD_ENABLE)) |
| skb->ignore_df = 1; |
| |
| SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS); |
| |
| rcu_read_lock(); |
| res = ip6_xmit(sk, skb, fl6, rcu_dereference(np->opt), np->tclass); |
| rcu_read_unlock(); |
| return res; |
| } |
| |
| /* Returns the dst cache entry for the given source and destination ip |
| * addresses. |
| */ |
| static void sctp_v6_get_dst(struct sctp_transport *t, union sctp_addr *saddr, |
| struct flowi *fl, struct sock *sk) |
| { |
| struct sctp_association *asoc = t->asoc; |
| struct dst_entry *dst = NULL; |
| struct flowi6 *fl6 = &fl->u.ip6; |
| struct sctp_bind_addr *bp; |
| struct ipv6_pinfo *np = inet6_sk(sk); |
| struct sctp_sockaddr_entry *laddr; |
| union sctp_addr *baddr = NULL; |
| union sctp_addr *daddr = &t->ipaddr; |
| union sctp_addr dst_saddr; |
| struct in6_addr *final_p, final; |
| __u8 matchlen = 0; |
| __u8 bmatchlen; |
| sctp_scope_t scope; |
| |
| memset(fl6, 0, sizeof(struct flowi6)); |
| fl6->daddr = daddr->v6.sin6_addr; |
| fl6->fl6_dport = daddr->v6.sin6_port; |
| fl6->flowi6_proto = IPPROTO_SCTP; |
| if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| fl6->flowi6_oif = daddr->v6.sin6_scope_id; |
| |
| pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr); |
| |
| if (asoc) |
| fl6->fl6_sport = htons(asoc->base.bind_addr.port); |
| |
| if (saddr) { |
| fl6->saddr = saddr->v6.sin6_addr; |
| fl6->fl6_sport = saddr->v6.sin6_port; |
| |
| pr_debug("src=%pI6 - ", &fl6->saddr); |
| } |
| |
| rcu_read_lock(); |
| final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); |
| rcu_read_unlock(); |
| |
| dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
| if (!asoc || saddr) |
| goto out; |
| |
| bp = &asoc->base.bind_addr; |
| scope = sctp_scope(daddr); |
| /* ip6_dst_lookup has filled in the fl6->saddr for us. Check |
| * to see if we can use it. |
| */ |
| if (!IS_ERR(dst)) { |
| /* Walk through the bind address list and look for a bind |
| * address that matches the source address of the returned dst. |
| */ |
| sctp_v6_to_addr(&dst_saddr, &fl6->saddr, htons(bp->port)); |
| rcu_read_lock(); |
| list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
| if (!laddr->valid || laddr->state == SCTP_ADDR_DEL || |
| (laddr->state != SCTP_ADDR_SRC && |
| !asoc->src_out_of_asoc_ok)) |
| continue; |
| |
| /* Do not compare against v4 addrs */ |
| if ((laddr->a.sa.sa_family == AF_INET6) && |
| (sctp_v6_cmp_addr(&dst_saddr, &laddr->a))) { |
| rcu_read_unlock(); |
| goto out; |
| } |
| } |
| rcu_read_unlock(); |
| /* None of the bound addresses match the source address of the |
| * dst. So release it. |
| */ |
| dst_release(dst); |
| dst = NULL; |
| } |
| |
| /* Walk through the bind address list and try to get the |
| * best source address for a given destination. |
| */ |
| rcu_read_lock(); |
| list_for_each_entry_rcu(laddr, &bp->address_list, list) { |
| if (!laddr->valid) |
| continue; |
| if ((laddr->state == SCTP_ADDR_SRC) && |
| (laddr->a.sa.sa_family == AF_INET6) && |
| (scope <= sctp_scope(&laddr->a))) { |
| bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a); |
| if (!baddr || (matchlen < bmatchlen)) { |
| baddr = &laddr->a; |
| matchlen = bmatchlen; |
| } |
| } |
| } |
| rcu_read_unlock(); |
| |
| if (baddr) { |
| fl6->saddr = baddr->v6.sin6_addr; |
| fl6->fl6_sport = baddr->v6.sin6_port; |
| final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final); |
| dst = ip6_dst_lookup_flow(sk, fl6, final_p); |
| } |
| |
| out: |
| if (!IS_ERR_OR_NULL(dst)) { |
| struct rt6_info *rt; |
| |
| rt = (struct rt6_info *)dst; |
| t->dst = dst; |
| t->dst_cookie = rt6_get_cookie(rt); |
| pr_debug("rt6_dst:%pI6/%d rt6_src:%pI6\n", |
| &rt->rt6i_dst.addr, rt->rt6i_dst.plen, |
| &fl6->saddr); |
| } else { |
| t->dst = NULL; |
| |
| pr_debug("no route\n"); |
| } |
| } |
| |
| /* Returns the number of consecutive initial bits that match in the 2 ipv6 |
| * addresses. |
| */ |
| static inline int sctp_v6_addr_match_len(union sctp_addr *s1, |
| union sctp_addr *s2) |
| { |
| return ipv6_addr_diff(&s1->v6.sin6_addr, &s2->v6.sin6_addr); |
| } |
| |
| /* Fills in the source address(saddr) based on the destination address(daddr) |
| * and asoc's bind address list. |
| */ |
| static void sctp_v6_get_saddr(struct sctp_sock *sk, |
| struct sctp_transport *t, |
| struct flowi *fl) |
| { |
| struct flowi6 *fl6 = &fl->u.ip6; |
| union sctp_addr *saddr = &t->saddr; |
| |
| pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst); |
| |
| if (t->dst) { |
| saddr->v6.sin6_family = AF_INET6; |
| saddr->v6.sin6_addr = fl6->saddr; |
| } |
| } |
| |
| /* Make a copy of all potential local addresses. */ |
| static void sctp_v6_copy_addrlist(struct list_head *addrlist, |
| struct net_device *dev) |
| { |
| struct inet6_dev *in6_dev; |
| struct inet6_ifaddr *ifp; |
| struct sctp_sockaddr_entry *addr; |
| |
| rcu_read_lock(); |
| if ((in6_dev = __in6_dev_get(dev)) == NULL) { |
| rcu_read_unlock(); |
| return; |
| } |
| |
| read_lock_bh(&in6_dev->lock); |
| list_for_each_entry(ifp, &in6_dev->addr_list, if_list) { |
| /* Add the address to the local list. */ |
| addr = kzalloc(sizeof(*addr), GFP_ATOMIC); |
| if (addr) { |
| addr->a.v6.sin6_family = AF_INET6; |
| addr->a.v6.sin6_port = 0; |
| addr->a.v6.sin6_addr = ifp->addr; |
| addr->a.v6.sin6_scope_id = dev->ifindex; |
| addr->valid = 1; |
| INIT_LIST_HEAD(&addr->list); |
| list_add_tail(&addr->list, addrlist); |
| } |
| } |
| |
| read_unlock_bh(&in6_dev->lock); |
| rcu_read_unlock(); |
| } |
| |
| /* Initialize a sockaddr_storage from in incoming skb. */ |
| static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb, |
| int is_saddr) |
| { |
| __be16 *port; |
| struct sctphdr *sh; |
| |
| port = &addr->v6.sin6_port; |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_flowinfo = 0; /* FIXME */ |
| addr->v6.sin6_scope_id = ((struct inet6_skb_parm *)skb->cb)->iif; |
| |
| sh = sctp_hdr(skb); |
| if (is_saddr) { |
| *port = sh->source; |
| addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; |
| } else { |
| *port = sh->dest; |
| addr->v6.sin6_addr = ipv6_hdr(skb)->daddr; |
| } |
| } |
| |
| /* Initialize an sctp_addr from a socket. */ |
| static void sctp_v6_from_sk(union sctp_addr *addr, struct sock *sk) |
| { |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_port = 0; |
| addr->v6.sin6_addr = sk->sk_v6_rcv_saddr; |
| } |
| |
| /* Initialize sk->sk_rcv_saddr from sctp_addr. */ |
| static void sctp_v6_to_sk_saddr(union sctp_addr *addr, struct sock *sk) |
| { |
| if (addr->sa.sa_family == AF_INET) { |
| sk->sk_v6_rcv_saddr.s6_addr32[0] = 0; |
| sk->sk_v6_rcv_saddr.s6_addr32[1] = 0; |
| sk->sk_v6_rcv_saddr.s6_addr32[2] = htonl(0x0000ffff); |
| sk->sk_v6_rcv_saddr.s6_addr32[3] = |
| addr->v4.sin_addr.s_addr; |
| } else { |
| sk->sk_v6_rcv_saddr = addr->v6.sin6_addr; |
| } |
| } |
| |
| /* Initialize sk->sk_daddr from sctp_addr. */ |
| static void sctp_v6_to_sk_daddr(union sctp_addr *addr, struct sock *sk) |
| { |
| if (addr->sa.sa_family == AF_INET) { |
| sk->sk_v6_daddr.s6_addr32[0] = 0; |
| sk->sk_v6_daddr.s6_addr32[1] = 0; |
| sk->sk_v6_daddr.s6_addr32[2] = htonl(0x0000ffff); |
| sk->sk_v6_daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr; |
| } else { |
| sk->sk_v6_daddr = addr->v6.sin6_addr; |
| } |
| } |
| |
| /* Initialize a sctp_addr from an address parameter. */ |
| static void sctp_v6_from_addr_param(union sctp_addr *addr, |
| union sctp_addr_param *param, |
| __be16 port, int iif) |
| { |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_port = port; |
| addr->v6.sin6_flowinfo = 0; /* BUG */ |
| addr->v6.sin6_addr = param->v6.addr; |
| addr->v6.sin6_scope_id = iif; |
| } |
| |
| /* Initialize an address parameter from a sctp_addr and return the length |
| * of the address parameter. |
| */ |
| static int sctp_v6_to_addr_param(const union sctp_addr *addr, |
| union sctp_addr_param *param) |
| { |
| int length = sizeof(sctp_ipv6addr_param_t); |
| |
| param->v6.param_hdr.type = SCTP_PARAM_IPV6_ADDRESS; |
| param->v6.param_hdr.length = htons(length); |
| param->v6.addr = addr->v6.sin6_addr; |
| |
| return length; |
| } |
| |
| /* Initialize a sctp_addr from struct in6_addr. */ |
| static void sctp_v6_to_addr(union sctp_addr *addr, struct in6_addr *saddr, |
| __be16 port) |
| { |
| addr->sa.sa_family = AF_INET6; |
| addr->v6.sin6_port = port; |
| addr->v6.sin6_addr = *saddr; |
| } |
| |
| /* Compare addresses exactly. |
| * v4-mapped-v6 is also in consideration. |
| */ |
| static int sctp_v6_cmp_addr(const union sctp_addr *addr1, |
| const union sctp_addr *addr2) |
| { |
| if (addr1->sa.sa_family != addr2->sa.sa_family) { |
| if (addr1->sa.sa_family == AF_INET && |
| addr2->sa.sa_family == AF_INET6 && |
| ipv6_addr_v4mapped(&addr2->v6.sin6_addr)) { |
| if (addr2->v6.sin6_port == addr1->v4.sin_port && |
| addr2->v6.sin6_addr.s6_addr32[3] == |
| addr1->v4.sin_addr.s_addr) |
| return 1; |
| } |
| if (addr2->sa.sa_family == AF_INET && |
| addr1->sa.sa_family == AF_INET6 && |
| ipv6_addr_v4mapped(&addr1->v6.sin6_addr)) { |
| if (addr1->v6.sin6_port == addr2->v4.sin_port && |
| addr1->v6.sin6_addr.s6_addr32[3] == |
| addr2->v4.sin_addr.s_addr) |
| return 1; |
| } |
| return 0; |
| } |
| if (!ipv6_addr_equal(&addr1->v6.sin6_addr, &addr2->v6.sin6_addr)) |
| return 0; |
| /* If this is a linklocal address, compare the scope_id. */ |
| if (ipv6_addr_type(&addr1->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { |
| if (addr1->v6.sin6_scope_id && addr2->v6.sin6_scope_id && |
| (addr1->v6.sin6_scope_id != addr2->v6.sin6_scope_id)) { |
| return 0; |
| } |
| } |
| |
| return 1; |
| } |
| |
| /* Initialize addr struct to INADDR_ANY. */ |
| static void sctp_v6_inaddr_any(union sctp_addr *addr, __be16 port) |
| { |
| memset(addr, 0x00, sizeof(union sctp_addr)); |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_port = port; |
| } |
| |
| /* Is this a wildcard address? */ |
| static int sctp_v6_is_any(const union sctp_addr *addr) |
| { |
| return ipv6_addr_any(&addr->v6.sin6_addr); |
| } |
| |
| /* Should this be available for binding? */ |
| static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp) |
| { |
| int type; |
| const struct in6_addr *in6 = (const struct in6_addr *)&addr->v6.sin6_addr; |
| |
| type = ipv6_addr_type(in6); |
| if (IPV6_ADDR_ANY == type) |
| return 1; |
| if (type == IPV6_ADDR_MAPPED) { |
| if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
| return 0; |
| sctp_v6_map_v4(addr); |
| return sctp_get_af_specific(AF_INET)->available(addr, sp); |
| } |
| if (!(type & IPV6_ADDR_UNICAST)) |
| return 0; |
| |
| return ipv6_chk_addr(sock_net(&sp->inet.sk), in6, NULL, 0); |
| } |
| |
| /* This function checks if the address is a valid address to be used for |
| * SCTP. |
| * |
| * Output: |
| * Return 0 - If the address is a non-unicast or an illegal address. |
| * Return 1 - If the address is a unicast. |
| */ |
| static int sctp_v6_addr_valid(union sctp_addr *addr, |
| struct sctp_sock *sp, |
| const struct sk_buff *skb) |
| { |
| int ret = ipv6_addr_type(&addr->v6.sin6_addr); |
| |
| /* Support v4-mapped-v6 address. */ |
| if (ret == IPV6_ADDR_MAPPED) { |
| /* Note: This routine is used in input, so v4-mapped-v6 |
| * are disallowed here when there is no sctp_sock. |
| */ |
| if (sp && ipv6_only_sock(sctp_opt2sk(sp))) |
| return 0; |
| sctp_v6_map_v4(addr); |
| return sctp_get_af_specific(AF_INET)->addr_valid(addr, sp, skb); |
| } |
| |
| /* Is this a non-unicast address */ |
| if (!(ret & IPV6_ADDR_UNICAST)) |
| return 0; |
| |
| return 1; |
| } |
| |
| /* What is the scope of 'addr'? */ |
| static sctp_scope_t sctp_v6_scope(union sctp_addr *addr) |
| { |
| int v6scope; |
| sctp_scope_t retval; |
| |
| /* The IPv6 scope is really a set of bit fields. |
| * See IFA_* in <net/if_inet6.h>. Map to a generic SCTP scope. |
| */ |
| |
| v6scope = ipv6_addr_scope(&addr->v6.sin6_addr); |
| switch (v6scope) { |
| case IFA_HOST: |
| retval = SCTP_SCOPE_LOOPBACK; |
| break; |
| case IFA_LINK: |
| retval = SCTP_SCOPE_LINK; |
| break; |
| case IFA_SITE: |
| retval = SCTP_SCOPE_PRIVATE; |
| break; |
| default: |
| retval = SCTP_SCOPE_GLOBAL; |
| break; |
| } |
| |
| return retval; |
| } |
| |
| /* Create and initialize a new sk for the socket to be returned by accept(). */ |
| static struct sock *sctp_v6_create_accept_sk(struct sock *sk, |
| struct sctp_association *asoc) |
| { |
| struct sock *newsk; |
| struct ipv6_pinfo *newnp, *np = inet6_sk(sk); |
| struct sctp6_sock *newsctp6sk; |
| |
| newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0); |
| if (!newsk) |
| goto out; |
| |
| sock_init_data(NULL, newsk); |
| |
| sctp_copy_sock(newsk, sk, asoc); |
| sock_reset_flag(sk, SOCK_ZAPPED); |
| |
| newsctp6sk = (struct sctp6_sock *)newsk; |
| inet_sk(newsk)->pinet6 = &newsctp6sk->inet6; |
| |
| sctp_sk(newsk)->v4mapped = sctp_sk(sk)->v4mapped; |
| |
| newnp = inet6_sk(newsk); |
| |
| memcpy(newnp, np, sizeof(struct ipv6_pinfo)); |
| |
| /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname() |
| * and getpeername(). |
| */ |
| sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk); |
| |
| newsk->sk_v6_rcv_saddr = sk->sk_v6_rcv_saddr; |
| |
| sk_refcnt_debug_inc(newsk); |
| |
| if (newsk->sk_prot->init(newsk)) { |
| sk_common_release(newsk); |
| newsk = NULL; |
| } |
| |
| out: |
| return newsk; |
| } |
| |
| /* Format a sockaddr for return to user space. This makes sure the return is |
| * AF_INET or AF_INET6 depending on the SCTP_I_WANT_MAPPED_V4_ADDR option. |
| */ |
| static int sctp_v6_addr_to_user(struct sctp_sock *sp, union sctp_addr *addr) |
| { |
| if (sp->v4mapped) { |
| if (addr->sa.sa_family == AF_INET) |
| sctp_v4_map_v6(addr); |
| } else { |
| if (addr->sa.sa_family == AF_INET6 && |
| ipv6_addr_v4mapped(&addr->v6.sin6_addr)) |
| sctp_v6_map_v4(addr); |
| } |
| |
| if (addr->sa.sa_family == AF_INET) |
| return sizeof(struct sockaddr_in); |
| return sizeof(struct sockaddr_in6); |
| } |
| |
| /* Where did this skb come from? */ |
| static int sctp_v6_skb_iif(const struct sk_buff *skb) |
| { |
| struct inet6_skb_parm *opt = (struct inet6_skb_parm *) skb->cb; |
| return opt->iif; |
| } |
| |
| /* Was this packet marked by Explicit Congestion Notification? */ |
| static int sctp_v6_is_ce(const struct sk_buff *skb) |
| { |
| return *((__u32 *)(ipv6_hdr(skb))) & htonl(1 << 20); |
| } |
| |
| /* Dump the v6 addr to the seq file. */ |
| static void sctp_v6_seq_dump_addr(struct seq_file *seq, union sctp_addr *addr) |
| { |
| seq_printf(seq, "%pI6 ", &addr->v6.sin6_addr); |
| } |
| |
| static void sctp_v6_ecn_capable(struct sock *sk) |
| { |
| inet6_sk(sk)->tclass |= INET_ECN_ECT_0; |
| } |
| |
| /* Initialize a PF_INET msgname from a ulpevent. */ |
| static void sctp_inet6_event_msgname(struct sctp_ulpevent *event, |
| char *msgname, int *addrlen) |
| { |
| union sctp_addr *addr; |
| struct sctp_association *asoc; |
| union sctp_addr *paddr; |
| |
| if (!msgname) |
| return; |
| |
| addr = (union sctp_addr *)msgname; |
| asoc = event->asoc; |
| paddr = &asoc->peer.primary_addr; |
| |
| if (paddr->sa.sa_family == AF_INET) { |
| addr->v4.sin_family = AF_INET; |
| addr->v4.sin_port = htons(asoc->peer.port); |
| addr->v4.sin_addr = paddr->v4.sin_addr; |
| } else { |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_flowinfo = 0; |
| if (ipv6_addr_type(&paddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) |
| addr->v6.sin6_scope_id = paddr->v6.sin6_scope_id; |
| else |
| addr->v6.sin6_scope_id = 0; |
| addr->v6.sin6_port = htons(asoc->peer.port); |
| addr->v6.sin6_addr = paddr->v6.sin6_addr; |
| } |
| |
| *addrlen = sctp_v6_addr_to_user(sctp_sk(asoc->base.sk), addr); |
| } |
| |
| /* Initialize a msg_name from an inbound skb. */ |
| static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname, |
| int *addr_len) |
| { |
| union sctp_addr *addr; |
| struct sctphdr *sh; |
| |
| if (!msgname) |
| return; |
| |
| addr = (union sctp_addr *)msgname; |
| sh = sctp_hdr(skb); |
| |
| if (ip_hdr(skb)->version == 4) { |
| addr->v4.sin_family = AF_INET; |
| addr->v4.sin_port = sh->source; |
| addr->v4.sin_addr.s_addr = ip_hdr(skb)->saddr; |
| } else { |
| addr->v6.sin6_family = AF_INET6; |
| addr->v6.sin6_flowinfo = 0; |
| addr->v6.sin6_port = sh->source; |
| addr->v6.sin6_addr = ipv6_hdr(skb)->saddr; |
| if (ipv6_addr_type(&addr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL) { |
| struct sctp_ulpevent *ev = sctp_skb2event(skb); |
| addr->v6.sin6_scope_id = ev->iif; |
| } |
| } |
| |
| *addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr); |
| } |
| |
| /* Do we support this AF? */ |
| static int sctp_inet6_af_supported(sa_family_t family, struct sctp_sock *sp) |
| { |
| switch (family) { |
| case AF_INET6: |
| return 1; |
| /* v4-mapped-v6 addresses */ |
| case AF_INET: |
| if (!__ipv6_only_sock(sctp_opt2sk(sp))) |
| return 1; |
| default: |
| return 0; |
| } |
| } |
| |
| /* Address matching with wildcards allowed. This extra level |
| * of indirection lets us choose whether a PF_INET6 should |
| * disallow any v4 addresses if we so choose. |
| */ |
| static int sctp_inet6_cmp_addr(const union sctp_addr *addr1, |
| const union sctp_addr *addr2, |
| struct sctp_sock *opt) |
| { |
| struct sctp_af *af1, *af2; |
| struct sock *sk = sctp_opt2sk(opt); |
| |
| af1 = sctp_get_af_specific(addr1->sa.sa_family); |
| af2 = sctp_get_af_specific(addr2->sa.sa_family); |
| |
| if (!af1 || !af2) |
| return 0; |
| |
| /* If the socket is IPv6 only, v4 addrs will not match */ |
| if (__ipv6_only_sock(sk) && af1 != af2) |
| return 0; |
| |
| /* Today, wildcard AF_INET/AF_INET6. */ |
| if (sctp_is_any(sk, addr1) || sctp_is_any(sk, addr2)) |
| return 1; |
| |
| if (addr1->sa.sa_family != addr2->sa.sa_family) |
| return 0; |
| |
| return af1->cmp_addr(addr1, addr2); |
| } |
| |
| /* Verify that the provided sockaddr looks bindable. Common verification, |
| * has already been taken care of. |
| */ |
| static int sctp_inet6_bind_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| { |
| struct sctp_af *af; |
| |
| /* ASSERT: address family has already been verified. */ |
| if (addr->sa.sa_family != AF_INET6) |
| af = sctp_get_af_specific(addr->sa.sa_family); |
| else { |
| int type = ipv6_addr_type(&addr->v6.sin6_addr); |
| struct net_device *dev; |
| |
| if (type & IPV6_ADDR_LINKLOCAL) { |
| struct net *net; |
| if (!addr->v6.sin6_scope_id) |
| return 0; |
| net = sock_net(&opt->inet.sk); |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(net, addr->v6.sin6_scope_id); |
| if (!dev || |
| !ipv6_chk_addr(net, &addr->v6.sin6_addr, dev, 0)) { |
| rcu_read_unlock(); |
| return 0; |
| } |
| rcu_read_unlock(); |
| } |
| |
| af = opt->pf->af; |
| } |
| return af->available(addr, opt); |
| } |
| |
| /* Verify that the provided sockaddr looks sendable. Common verification, |
| * has already been taken care of. |
| */ |
| static int sctp_inet6_send_verify(struct sctp_sock *opt, union sctp_addr *addr) |
| { |
| struct sctp_af *af = NULL; |
| |
| /* ASSERT: address family has already been verified. */ |
| if (addr->sa.sa_family != AF_INET6) |
| af = sctp_get_af_specific(addr->sa.sa_family); |
| else { |
| int type = ipv6_addr_type(&addr->v6.sin6_addr); |
| struct net_device *dev; |
| |
| if (type & IPV6_ADDR_LINKLOCAL) { |
| if (!addr->v6.sin6_scope_id) |
| return 0; |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(sock_net(&opt->inet.sk), |
| addr->v6.sin6_scope_id); |
| rcu_read_unlock(); |
| if (!dev) |
| return 0; |
| } |
| af = opt->pf->af; |
| } |
| |
| return af != NULL; |
| } |
| |
| /* Fill in Supported Address Type information for INIT and INIT-ACK |
| * chunks. Note: In the future, we may want to look at sock options |
| * to determine whether a PF_INET6 socket really wants to have IPV4 |
| * addresses. |
| * Returns number of addresses supported. |
| */ |
| static int sctp_inet6_supported_addrs(const struct sctp_sock *opt, |
| __be16 *types) |
| { |
| types[0] = SCTP_PARAM_IPV6_ADDRESS; |
| if (!opt || !ipv6_only_sock(sctp_opt2sk(opt))) { |
| types[1] = SCTP_PARAM_IPV4_ADDRESS; |
| return 2; |
| } |
| return 1; |
| } |
| |
| /* Handle SCTP_I_WANT_MAPPED_V4_ADDR for getpeername() and getsockname() */ |
| static int sctp_getname(struct socket *sock, struct sockaddr *uaddr, |
| int *uaddr_len, int peer) |
| { |
| int rc; |
| |
| rc = inet6_getname(sock, uaddr, uaddr_len, peer); |
| |
| if (rc != 0) |
| return rc; |
| |
| *uaddr_len = sctp_v6_addr_to_user(sctp_sk(sock->sk), |
| (union sctp_addr *)uaddr); |
| |
| return rc; |
| } |
| |
| static const struct proto_ops inet6_seqpacket_ops = { |
| .family = PF_INET6, |
| .owner = THIS_MODULE, |
| .release = inet6_release, |
| .bind = inet6_bind, |
| .connect = inet_dgram_connect, |
| .socketpair = sock_no_socketpair, |
| .accept = inet_accept, |
| .getname = sctp_getname, |
| .poll = sctp_poll, |
| .ioctl = inet6_ioctl, |
| .listen = sctp_inet_listen, |
| .shutdown = inet_shutdown, |
| .setsockopt = sock_common_setsockopt, |
| .getsockopt = sock_common_getsockopt, |
| .sendmsg = inet_sendmsg, |
| .recvmsg = sock_common_recvmsg, |
| .mmap = sock_no_mmap, |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_sock_common_setsockopt, |
| .compat_getsockopt = compat_sock_common_getsockopt, |
| #endif |
| }; |
| |
| static struct inet_protosw sctpv6_seqpacket_protosw = { |
| .type = SOCK_SEQPACKET, |
| .protocol = IPPROTO_SCTP, |
| .prot = &sctpv6_prot, |
| .ops = &inet6_seqpacket_ops, |
| .flags = SCTP_PROTOSW_FLAG |
| }; |
| static struct inet_protosw sctpv6_stream_protosw = { |
| .type = SOCK_STREAM, |
| .protocol = IPPROTO_SCTP, |
| .prot = &sctpv6_prot, |
| .ops = &inet6_seqpacket_ops, |
| .flags = SCTP_PROTOSW_FLAG, |
| }; |
| |
| static int sctp6_rcv(struct sk_buff *skb) |
| { |
| return sctp_rcv(skb) ? -1 : 0; |
| } |
| |
| static const struct inet6_protocol sctpv6_protocol = { |
| .handler = sctp6_rcv, |
| .err_handler = sctp_v6_err, |
| .flags = INET6_PROTO_NOPOLICY | INET6_PROTO_FINAL, |
| }; |
| |
| static struct sctp_af sctp_af_inet6 = { |
| .sa_family = AF_INET6, |
| .sctp_xmit = sctp_v6_xmit, |
| .setsockopt = ipv6_setsockopt, |
| .getsockopt = ipv6_getsockopt, |
| .get_dst = sctp_v6_get_dst, |
| .get_saddr = sctp_v6_get_saddr, |
| .copy_addrlist = sctp_v6_copy_addrlist, |
| .from_skb = sctp_v6_from_skb, |
| .from_sk = sctp_v6_from_sk, |
| .from_addr_param = sctp_v6_from_addr_param, |
| .to_addr_param = sctp_v6_to_addr_param, |
| .cmp_addr = sctp_v6_cmp_addr, |
| .scope = sctp_v6_scope, |
| .addr_valid = sctp_v6_addr_valid, |
| .inaddr_any = sctp_v6_inaddr_any, |
| .is_any = sctp_v6_is_any, |
| .available = sctp_v6_available, |
| .skb_iif = sctp_v6_skb_iif, |
| .is_ce = sctp_v6_is_ce, |
| .seq_dump_addr = sctp_v6_seq_dump_addr, |
| .ecn_capable = sctp_v6_ecn_capable, |
| .net_header_len = sizeof(struct ipv6hdr), |
| .sockaddr_len = sizeof(struct sockaddr_in6), |
| #ifdef CONFIG_COMPAT |
| .compat_setsockopt = compat_ipv6_setsockopt, |
| .compat_getsockopt = compat_ipv6_getsockopt, |
| #endif |
| }; |
| |
| static struct sctp_pf sctp_pf_inet6 = { |
| .event_msgname = sctp_inet6_event_msgname, |
| .skb_msgname = sctp_inet6_skb_msgname, |
| .af_supported = sctp_inet6_af_supported, |
| .cmp_addr = sctp_inet6_cmp_addr, |
| .bind_verify = sctp_inet6_bind_verify, |
| .send_verify = sctp_inet6_send_verify, |
| .supported_addrs = sctp_inet6_supported_addrs, |
| .create_accept_sk = sctp_v6_create_accept_sk, |
| .addr_to_user = sctp_v6_addr_to_user, |
| .to_sk_saddr = sctp_v6_to_sk_saddr, |
| .to_sk_daddr = sctp_v6_to_sk_daddr, |
| .af = &sctp_af_inet6, |
| }; |
| |
| /* Initialize IPv6 support and register with socket layer. */ |
| void sctp_v6_pf_init(void) |
| { |
| /* Register the SCTP specific PF_INET6 functions. */ |
| sctp_register_pf(&sctp_pf_inet6, PF_INET6); |
| |
| /* Register the SCTP specific AF_INET6 functions. */ |
| sctp_register_af(&sctp_af_inet6); |
| } |
| |
| void sctp_v6_pf_exit(void) |
| { |
| list_del(&sctp_af_inet6.list); |
| } |
| |
| /* Initialize IPv6 support and register with socket layer. */ |
| int sctp_v6_protosw_init(void) |
| { |
| int rc; |
| |
| rc = proto_register(&sctpv6_prot, 1); |
| if (rc) |
| return rc; |
| |
| /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */ |
| inet6_register_protosw(&sctpv6_seqpacket_protosw); |
| inet6_register_protosw(&sctpv6_stream_protosw); |
| |
| return 0; |
| } |
| |
| void sctp_v6_protosw_exit(void) |
| { |
| inet6_unregister_protosw(&sctpv6_seqpacket_protosw); |
| inet6_unregister_protosw(&sctpv6_stream_protosw); |
| proto_unregister(&sctpv6_prot); |
| } |
| |
| |
| /* Register with inet6 layer. */ |
| int sctp_v6_add_protocol(void) |
| { |
| /* Register notifier for inet6 address additions/deletions. */ |
| register_inet6addr_notifier(&sctp_inet6addr_notifier); |
| |
| if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0) |
| return -EAGAIN; |
| |
| return 0; |
| } |
| |
| /* Unregister with inet6 layer. */ |
| void sctp_v6_del_protocol(void) |
| { |
| inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP); |
| unregister_inet6addr_notifier(&sctp_inet6addr_notifier); |
| } |