File-copy from v4.4.100
This is the result of 'cp' from a linux-stable tree with the 'v4.4.100'
tag checked out (commit 26d6298789e695c9f627ce49a7bbd2286405798a) on
git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Please refer to that tree for all history prior to this point.
Change-Id: I8a9ee2aea93cd29c52c847d0ce33091a73ae6afe
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
new file mode 100644
index 0000000..e33e9bd
--- /dev/null
+++ b/net/sctp/ipv6.c
@@ -0,0 +1,1110 @@
+/* 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 *daddr = &t->ipaddr;
+ union sctp_addr dst_saddr;
+ struct in6_addr *final_p, final;
+ __u8 matchlen = 0;
+ 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) {
+ struct dst_entry *bdst;
+ __u8 bmatchlen;
+
+ if (!laddr->valid ||
+ laddr->state != SCTP_ADDR_SRC ||
+ laddr->a.sa.sa_family != AF_INET6 ||
+ scope > sctp_scope(&laddr->a))
+ continue;
+
+ fl6->saddr = laddr->a.v6.sin6_addr;
+ fl6->fl6_sport = laddr->a.v6.sin6_port;
+ final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
+ bdst = ip6_dst_lookup_flow(sk, fl6, final_p);
+
+ if (!IS_ERR(bdst) &&
+ ipv6_chk_addr(dev_net(bdst->dev),
+ &laddr->a.v6.sin6_addr, bdst->dev, 1)) {
+ if (!IS_ERR_OR_NULL(dst))
+ dst_release(dst);
+ dst = bdst;
+ break;
+ }
+
+ bmatchlen = sctp_v6_addr_match_len(daddr, &laddr->a);
+ if (matchlen > bmatchlen)
+ continue;
+
+ if (!IS_ERR_OR_NULL(dst))
+ dst_release(dst);
+ dst = bdst;
+ matchlen = bmatchlen;
+ }
+ rcu_read_unlock();
+
+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_flowinfo = 0;
+ addr->v6.sin6_addr = *saddr;
+ addr->v6.sin6_scope_id = 0;
+}
+
+/* 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 (addr1->v6.sin6_port != addr2->v6.sin6_port)
+ 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;
+ struct ipv6_txoptions *opt;
+
+ 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));
+ newnp->ipv6_mc_list = NULL;
+ newnp->ipv6_ac_list = NULL;
+ newnp->ipv6_fl_list = NULL;
+
+ rcu_read_lock();
+ opt = rcu_dereference(np->opt);
+ if (opt)
+ opt = ipv6_dup_options(newsk, opt);
+ RCU_INIT_POINTER(newnp->opt, opt);
+ rcu_read_unlock();
+
+ /* 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);
+}