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-rw-r--r--net/sctp/ipv6.c1013
1 files changed, 1013 insertions, 0 deletions
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
new file mode 100644
index 000000000000..e42c74e3ec1e
--- /dev/null
+++ b/net/sctp/ipv6.c
@@ -0,0 +1,1013 @@
+/* SCTP kernel reference 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 reference Implementation
+ *
+ * SCTP over IPv6.
+ *
+ * The SCTP reference 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.
+ *
+ * The SCTP reference 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, write to
+ * the Free Software Foundation, 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ *
+ * Please send any bug reports or fixes you make to the
+ * email address(es):
+ * lksctp developers <lksctp-developers@lists.sourceforge.net>
+ *
+ * Or submit a bug report through the following website:
+ * http://www.sf.net/projects/lksctp
+ *
+ * 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
+ *
+ * Any bugs reported given to us we will try to fix... any fixes shared will
+ * be incorporated into the next SCTP release.
+ */
+
+#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/sched.h>
+#include <linux/in.h>
+#include <linux/in6.h>
+#include <linux/netdevice.h>
+#include <linux/init.h>
+#include <linux/ipsec.h>
+
+#include <linux/ipv6.h>
+#include <linux/icmpv6.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+
+#include <net/protocol.h>
+#include <net/tcp.h>
+#include <net/ndisc.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>
+
+extern int sctp_inetaddr_event(struct notifier_block *, unsigned long, void *);
+static struct notifier_block sctp_inet6addr_notifier = {
+ .notifier_call = sctp_inetaddr_event,
+};
+
+/* ICMP error handler. */
+SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ int type, int code, int offset, __u32 info)
+{
+ struct inet6_dev *idev;
+ struct ipv6hdr *iph = (struct ipv6hdr *)skb->data;
+ struct sctphdr *sh = (struct sctphdr *)(skb->data + offset);
+ struct sock *sk;
+ struct sctp_endpoint *ep;
+ struct sctp_association *asoc;
+ struct sctp_transport *transport;
+ struct ipv6_pinfo *np;
+ char *saveip, *savesctp;
+ int err;
+
+ idev = in6_dev_get(skb->dev);
+
+ /* Fix up skb to look at the embedded net header. */
+ saveip = skb->nh.raw;
+ savesctp = skb->h.raw;
+ skb->nh.ipv6h = iph;
+ skb->h.raw = (char *)sh;
+ sk = sctp_err_lookup(AF_INET6, skb, sh, &ep, &asoc, &transport);
+ /* Put back, the original pointers. */
+ skb->nh.raw = saveip;
+ skb->h.raw = savesctp;
+ if (!sk) {
+ ICMP6_INC_STATS_BH(idev, ICMP6_MIB_INERRORS);
+ goto out;
+ }
+
+ /* Warning: The sock lock is held. Remember to call
+ * sctp_err_finish!
+ */
+
+ switch (type) {
+ case ICMPV6_PKT_TOOBIG:
+ 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, ep, asoc, transport);
+ goto out_unlock;
+ }
+ break;
+ 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, ep, asoc);
+out:
+ if (likely(idev != NULL))
+ in6_dev_put(idev);
+}
+
+/* Based on tcp_v6_xmit() in tcp_ipv6.c. */
+static int sctp_v6_xmit(struct sk_buff *skb, struct sctp_transport *transport,
+ int ipfragok)
+{
+ struct sock *sk = skb->sk;
+ struct ipv6_pinfo *np = inet6_sk(sk);
+ struct flowi fl;
+
+ memset(&fl, 0, sizeof(fl));
+
+ fl.proto = sk->sk_protocol;
+
+ /* Fill in the dest address from the route entry passed with the skb
+ * and the source address from the transport.
+ */
+ ipv6_addr_copy(&fl.fl6_dst, &transport->ipaddr.v6.sin6_addr);
+ ipv6_addr_copy(&fl.fl6_src, &transport->saddr.v6.sin6_addr);
+
+ fl.fl6_flowlabel = np->flow_label;
+ IP6_ECN_flow_xmit(sk, fl.fl6_flowlabel);
+ if (ipv6_addr_type(&fl.fl6_src) & IPV6_ADDR_LINKLOCAL)
+ fl.oif = transport->saddr.v6.sin6_scope_id;
+ else
+ fl.oif = sk->sk_bound_dev_if;
+ fl.fl_ip_sport = inet_sk(sk)->sport;
+ fl.fl_ip_dport = transport->ipaddr.v6.sin6_port;
+
+ if (np->opt && np->opt->srcrt) {
+ struct rt0_hdr *rt0 = (struct rt0_hdr *) np->opt->srcrt;
+ ipv6_addr_copy(&fl.fl6_dst, rt0->addr);
+ }
+
+ SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, "
+ "src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+ "dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ __FUNCTION__, skb, skb->len,
+ NIP6(fl.fl6_src), NIP6(fl.fl6_dst));
+
+ SCTP_INC_STATS(SCTP_MIB_OUTSCTPPACKS);
+
+ return ip6_xmit(sk, skb, &fl, np->opt, ipfragok);
+}
+
+/* Returns the dst cache entry for the given source and destination ip
+ * addresses.
+ */
+static struct dst_entry *sctp_v6_get_dst(struct sctp_association *asoc,
+ union sctp_addr *daddr,
+ union sctp_addr *saddr)
+{
+ struct dst_entry *dst;
+ struct flowi fl;
+
+ memset(&fl, 0, sizeof(fl));
+ ipv6_addr_copy(&fl.fl6_dst, &daddr->v6.sin6_addr);
+ if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ fl.oif = daddr->v6.sin6_scope_id;
+
+
+ SCTP_DEBUG_PRINTK("%s: DST=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+ __FUNCTION__, NIP6(fl.fl6_dst));
+
+ if (saddr) {
+ ipv6_addr_copy(&fl.fl6_src, &saddr->v6.sin6_addr);
+ SCTP_DEBUG_PRINTK(
+ "SRC=%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x - ",
+ NIP6(fl.fl6_src));
+ }
+
+ dst = ip6_route_output(NULL, &fl);
+ if (dst) {
+ struct rt6_info *rt;
+ rt = (struct rt6_info *)dst;
+ SCTP_DEBUG_PRINTK(
+ "rt6_dst:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x "
+ "rt6_src:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ NIP6(rt->rt6i_dst.addr), NIP6(rt->rt6i_src.addr));
+ } else {
+ SCTP_DEBUG_PRINTK("NO ROUTE\n");
+ }
+
+ return dst;
+}
+
+/* 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)
+{
+ struct in6_addr *a1 = &s1->v6.sin6_addr;
+ struct in6_addr *a2 = &s2->v6.sin6_addr;
+ int i, j;
+
+ for (i = 0; i < 4 ; i++) {
+ __u32 a1xora2;
+
+ a1xora2 = a1->s6_addr32[i] ^ a2->s6_addr32[i];
+
+ if ((j = fls(ntohl(a1xora2))))
+ return (i * 32 + 32 - j);
+ }
+
+ return (i*32);
+}
+
+/* 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_association *asoc,
+ struct dst_entry *dst,
+ union sctp_addr *daddr,
+ union sctp_addr *saddr)
+{
+ struct sctp_bind_addr *bp;
+ rwlock_t *addr_lock;
+ struct sctp_sockaddr_entry *laddr;
+ struct list_head *pos;
+ sctp_scope_t scope;
+ union sctp_addr *baddr = NULL;
+ __u8 matchlen = 0;
+ __u8 bmatchlen;
+
+ SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p "
+ "daddr:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+ __FUNCTION__, asoc, dst, NIP6(daddr->v6.sin6_addr));
+
+ if (!asoc) {
+ ipv6_get_saddr(dst, &daddr->v6.sin6_addr,&saddr->v6.sin6_addr);
+ SCTP_DEBUG_PRINTK("saddr from ipv6_get_saddr: "
+ "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ NIP6(saddr->v6.sin6_addr));
+ return;
+ }
+
+ scope = sctp_scope(daddr);
+
+ bp = &asoc->base.bind_addr;
+ addr_lock = &asoc->base.addr_lock;
+
+ /* Go through the bind address list and find the best source address
+ * that matches the scope of the destination address.
+ */
+ sctp_read_lock(addr_lock);
+ list_for_each(pos, &bp->address_list) {
+ laddr = list_entry(pos, struct sctp_sockaddr_entry, list);
+ if ((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;
+ }
+ }
+ }
+
+ if (baddr) {
+ memcpy(saddr, baddr, sizeof(union sctp_addr));
+ SCTP_DEBUG_PRINTK("saddr: "
+ "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ NIP6(saddr->v6.sin6_addr));
+ } else {
+ printk(KERN_ERR "%s: asoc:%p Could not find a valid source "
+ "address for the "
+ "dest:%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ __FUNCTION__, asoc, NIP6(daddr->v6.sin6_addr));
+ }
+
+ sctp_read_unlock(addr_lock);
+}
+
+/* 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;
+
+ read_lock(&addrconf_lock);
+ if ((in6_dev = __in6_dev_get(dev)) == NULL) {
+ read_unlock(&addrconf_lock);
+ return;
+ }
+
+ read_lock(&in6_dev->lock);
+ for (ifp = in6_dev->addr_list; ifp; ifp = ifp->if_next) {
+ /* Add the address to the local list. */
+ addr = t_new(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 = ifp->addr;
+ addr->a.v6.sin6_scope_id = dev->ifindex;
+ INIT_LIST_HEAD(&addr->list);
+ list_add_tail(&addr->list, addrlist);
+ }
+ }
+
+ read_unlock(&in6_dev->lock);
+ read_unlock(&addrconf_lock);
+}
+
+/* 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)
+{
+ void *from;
+ __u16 *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 = (struct sctphdr *) skb->h.raw;
+ if (is_saddr) {
+ *port = ntohs(sh->source);
+ from = &skb->nh.ipv6h->saddr;
+ } else {
+ *port = ntohs(sh->dest);
+ from = &skb->nh.ipv6h->daddr;
+ }
+ ipv6_addr_copy(&addr->v6.sin6_addr, from);
+}
+
+/* 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 = inet_sk(sk)->num;
+ addr->v6.sin6_addr = inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
+ inet6_sk(sk)->rcv_saddr.s6_addr32[0] = 0;
+ inet6_sk(sk)->rcv_saddr.s6_addr32[1] = 0;
+ inet6_sk(sk)->rcv_saddr.s6_addr32[2] = htonl(0x0000ffff);
+ inet6_sk(sk)->rcv_saddr.s6_addr32[3] =
+ addr->v4.sin_addr.s_addr;
+ } else {
+ inet6_sk(sk)->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 && sctp_sk(sk)->v4mapped) {
+ inet6_sk(sk)->daddr.s6_addr32[0] = 0;
+ inet6_sk(sk)->daddr.s6_addr32[1] = 0;
+ inet6_sk(sk)->daddr.s6_addr32[2] = htonl(0x0000ffff);
+ inet6_sk(sk)->daddr.s6_addr32[3] = addr->v4.sin_addr.s_addr;
+ } else {
+ inet6_sk(sk)->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,
+ __u16 port, int iif)
+{
+ addr->v6.sin6_family = AF_INET6;
+ addr->v6.sin6_port = port;
+ addr->v6.sin6_flowinfo = 0; /* BUG */
+ ipv6_addr_copy(&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 = ntohs(length);
+ ipv6_addr_copy(&param->v6.addr, &addr->v6.sin6_addr);
+
+ return length;
+}
+
+/* Initialize a sctp_addr from a dst_entry. */
+static void sctp_v6_dst_saddr(union sctp_addr *addr, struct dst_entry *dst,
+ unsigned short port)
+{
+ struct rt6_info *rt = (struct rt6_info *)dst;
+ addr->sa.sa_family = AF_INET6;
+ addr->v6.sin6_port = port;
+ ipv6_addr_copy(&addr->v6.sin6_addr, &rt->rt6i_src.addr);
+}
+
+/* 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_MAPPED == ipv6_addr_type(&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_MAPPED == ipv6_addr_type(&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, unsigned short 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)
+{
+ int type;
+ type = ipv6_addr_type((struct in6_addr *)&addr->v6.sin6_addr);
+ return IPV6_ADDR_ANY == type;
+}
+
+/* Should this be available for binding? */
+static int sctp_v6_available(union sctp_addr *addr, struct sctp_sock *sp)
+{
+ int type;
+ struct in6_addr *in6 = (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 && !sp->v4mapped)
+ return 0;
+ 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(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)
+{
+ 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 || !sp->v4mapped)
+ return 0;
+ 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);
+ }
+
+ /* 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 inet_sock *inet = inet_sk(sk);
+ struct sock *newsk;
+ struct inet_sock *newinet;
+ struct ipv6_pinfo *newnp, *np = inet6_sk(sk);
+ struct sctp6_sock *newsctp6sk;
+
+ newsk = sk_alloc(PF_INET6, GFP_KERNEL, sk->sk_prot, 1);
+ if (!newsk)
+ goto out;
+
+ sock_init_data(NULL, newsk);
+
+ newsk->sk_type = SOCK_STREAM;
+
+ newsk->sk_prot = sk->sk_prot;
+ newsk->sk_no_check = sk->sk_no_check;
+ newsk->sk_reuse = sk->sk_reuse;
+
+ newsk->sk_destruct = inet_sock_destruct;
+ newsk->sk_family = PF_INET6;
+ newsk->sk_protocol = IPPROTO_SCTP;
+ newsk->sk_backlog_rcv = sk->sk_prot->backlog_rcv;
+ newsk->sk_shutdown = sk->sk_shutdown;
+ sock_reset_flag(sk, SOCK_ZAPPED);
+
+ newsctp6sk = (struct sctp6_sock *)newsk;
+ inet_sk(newsk)->pinet6 = &newsctp6sk->inet6;
+
+ newinet = inet_sk(newsk);
+ newnp = inet6_sk(newsk);
+
+ memcpy(newnp, np, sizeof(struct ipv6_pinfo));
+
+ /* Initialize sk's sport, dport, rcv_saddr and daddr for getsockname()
+ * and getpeername().
+ */
+ newinet->sport = inet->sport;
+ newnp->saddr = np->saddr;
+ newnp->rcv_saddr = np->rcv_saddr;
+ newinet->dport = htons(asoc->peer.port);
+ sctp_v6_to_sk_daddr(&asoc->peer.primary_addr, newsk);
+
+ /* Init the ipv4 part of the socket since we can have sockets
+ * using v6 API for ipv4.
+ */
+ newinet->uc_ttl = -1;
+ newinet->mc_loop = 1;
+ newinet->mc_ttl = 1;
+ newinet->mc_index = 0;
+ newinet->mc_list = NULL;
+
+ if (ipv4_config.no_pmtu_disc)
+ newinet->pmtudisc = IP_PMTUDISC_DONT;
+ else
+ newinet->pmtudisc = IP_PMTUDISC_WANT;
+
+#ifdef INET_REFCNT_DEBUG
+ atomic_inc(&inet6_sock_nr);
+ atomic_inc(&inet_sock_nr);
+#endif
+
+ if (newsk->sk_prot->init(newsk)) {
+ sk_common_release(newsk);
+ newsk = NULL;
+ }
+
+out:
+ return newsk;
+}
+
+/* Map v4 address to mapped v6 address */
+static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
+{
+ if (sp->v4mapped && AF_INET == addr->sa.sa_family)
+ sctp_v4_map_v6(addr);
+}
+
+/* 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 *)(skb->nh.ipv6h)) & 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, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x ",
+ NIP6(addr->v6.sin6_addr));
+}
+
+/* Initialize a PF_INET6 socket msg_name. */
+static void sctp_inet6_msgname(char *msgname, int *addr_len)
+{
+ struct sockaddr_in6 *sin6;
+
+ sin6 = (struct sockaddr_in6 *)msgname;
+ sin6->sin6_family = AF_INET6;
+ sin6->sin6_flowinfo = 0;
+ sin6->sin6_scope_id = 0; /*FIXME */
+ *addr_len = sizeof(struct sockaddr_in6);
+}
+
+/* Initialize a PF_INET msgname from a ulpevent. */
+static void sctp_inet6_event_msgname(struct sctp_ulpevent *event,
+ char *msgname, int *addrlen)
+{
+ struct sockaddr_in6 *sin6, *sin6from;
+
+ if (msgname) {
+ union sctp_addr *addr;
+ struct sctp_association *asoc;
+
+ asoc = event->asoc;
+ sctp_inet6_msgname(msgname, addrlen);
+ sin6 = (struct sockaddr_in6 *)msgname;
+ sin6->sin6_port = htons(asoc->peer.port);
+ addr = &asoc->peer.primary_addr;
+
+ /* Note: If we go to a common v6 format, this code
+ * will change.
+ */
+
+ /* Map ipv4 address into v4-mapped-on-v6 address. */
+ if (sctp_sk(asoc->base.sk)->v4mapped &&
+ AF_INET == addr->sa.sa_family) {
+ sctp_v4_map_v6((union sctp_addr *)sin6);
+ sin6->sin6_addr.s6_addr32[3] =
+ addr->v4.sin_addr.s_addr;
+ return;
+ }
+
+ sin6from = &asoc->peer.primary_addr.v6;
+ ipv6_addr_copy(&sin6->sin6_addr, &sin6from->sin6_addr);
+ if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
+ sin6->sin6_scope_id = sin6from->sin6_scope_id;
+ }
+}
+
+/* Initialize a msg_name from an inbound skb. */
+static void sctp_inet6_skb_msgname(struct sk_buff *skb, char *msgname,
+ int *addr_len)
+{
+ struct sctphdr *sh;
+ struct sockaddr_in6 *sin6;
+
+ if (msgname) {
+ sctp_inet6_msgname(msgname, addr_len);
+ sin6 = (struct sockaddr_in6 *)msgname;
+ sh = (struct sctphdr *)skb->h.raw;
+ sin6->sin6_port = sh->source;
+
+ /* Map ipv4 address into v4-mapped-on-v6 address. */
+ if (sctp_sk(skb->sk)->v4mapped &&
+ skb->nh.iph->version == 4) {
+ sctp_v4_map_v6((union sctp_addr *)sin6);
+ sin6->sin6_addr.s6_addr32[3] = skb->nh.iph->saddr;
+ return;
+ }
+
+ /* Otherwise, just copy the v6 address. */
+ ipv6_addr_copy(&sin6->sin6_addr, &skb->nh.ipv6h->saddr);
+ if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
+ struct sctp_ulpevent *ev = sctp_skb2event(skb);
+ sin6->sin6_scope_id = ev->iif;
+ }
+ }
+}
+
+/* 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)) && sp->v4mapped)
+ 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;
+
+ af1 = sctp_get_af_specific(addr1->sa.sa_family);
+ af2 = sctp_get_af_specific(addr2->sa.sa_family);
+
+ if (!af1 || !af2)
+ return 0;
+ /* Today, wildcard AF_INET/AF_INET6. */
+ if (sctp_is_any(addr1) || sctp_is_any(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 {
+ struct sock *sk;
+ int type = ipv6_addr_type(&addr->v6.sin6_addr);
+ sk = sctp_opt2sk(opt);
+ if (type & IPV6_ADDR_LINKLOCAL) {
+ /* Note: Behavior similar to af_inet6.c:
+ * 1) Overrides previous bound_dev_if
+ * 2) Destructive even if bind isn't successful.
+ */
+
+ if (addr->v6.sin6_scope_id)
+ sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
+ if (!sk->sk_bound_dev_if)
+ return 0;
+ }
+ af = opt->pf->af;
+ }
+ return af->available(addr, opt);
+}
+
+/* Verify that the provided sockaddr looks bindable. 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 {
+ struct sock *sk;
+ int type = ipv6_addr_type(&addr->v6.sin6_addr);
+ sk = sctp_opt2sk(opt);
+ if (type & IPV6_ADDR_LINKLOCAL) {
+ /* Note: Behavior similar to af_inet6.c:
+ * 1) Overrides previous bound_dev_if
+ * 2) Destructive even if bind isn't successful.
+ */
+
+ if (addr->v6.sin6_scope_id)
+ sk->sk_bound_dev_if = addr->v6.sin6_scope_id;
+ if (!sk->sk_bound_dev_if)
+ 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,
+ __u16 *types)
+{
+ types[0] = SCTP_PARAM_IPV4_ADDRESS;
+ types[1] = SCTP_PARAM_IPV6_ADDRESS;
+ return 2;
+}
+
+static 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 = inet6_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,
+};
+
+static struct inet_protosw sctpv6_seqpacket_protosw = {
+ .type = SOCK_SEQPACKET,
+ .protocol = IPPROTO_SCTP,
+ .prot = &sctpv6_prot,
+ .ops = &inet6_seqpacket_ops,
+ .capability = -1,
+ .no_check = 0,
+ .flags = SCTP_PROTOSW_FLAG
+};
+static struct inet_protosw sctpv6_stream_protosw = {
+ .type = SOCK_STREAM,
+ .protocol = IPPROTO_SCTP,
+ .prot = &sctpv6_prot,
+ .ops = &inet6_seqpacket_ops,
+ .capability = -1,
+ .no_check = 0,
+ .flags = SCTP_PROTOSW_FLAG,
+};
+
+static int sctp6_rcv(struct sk_buff **pskb, unsigned int *nhoffp)
+{
+ return sctp_rcv(*pskb) ? -1 : 0;
+}
+
+static 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_ipv6_specific = {
+ .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,
+ .to_sk_saddr = sctp_v6_to_sk_saddr,
+ .to_sk_daddr = sctp_v6_to_sk_daddr,
+ .from_addr_param = sctp_v6_from_addr_param,
+ .to_addr_param = sctp_v6_to_addr_param,
+ .dst_saddr = sctp_v6_dst_saddr,
+ .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,
+ .net_header_len = sizeof(struct ipv6hdr),
+ .sockaddr_len = sizeof(struct sockaddr_in6),
+ .sa_family = AF_INET6,
+};
+
+static struct sctp_pf sctp_pf_inet6_specific = {
+ .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_v4map = sctp_v6_addr_v4map,
+ .af = &sctp_ipv6_specific,
+};
+
+/* Initialize IPv6 support and register with inet6 stack. */
+int sctp_v6_init(void)
+{
+ int rc = proto_register(&sctpv6_prot, 1);
+
+ if (rc)
+ goto out;
+ /* Register inet6 protocol. */
+ rc = -EAGAIN;
+ if (inet6_add_protocol(&sctpv6_protocol, IPPROTO_SCTP) < 0)
+ goto out_unregister_sctp_proto;
+
+ /* Add SCTPv6(UDP and TCP style) to inetsw6 linked list. */
+ inet6_register_protosw(&sctpv6_seqpacket_protosw);
+ inet6_register_protosw(&sctpv6_stream_protosw);
+
+ /* Register the SCTP specific PF_INET6 functions. */
+ sctp_register_pf(&sctp_pf_inet6_specific, PF_INET6);
+
+ /* Register the SCTP specific AF_INET6 functions. */
+ sctp_register_af(&sctp_ipv6_specific);
+
+ /* Register notifier for inet6 address additions/deletions. */
+ register_inet6addr_notifier(&sctp_inet6addr_notifier);
+ rc = 0;
+out:
+ return rc;
+out_unregister_sctp_proto:
+ proto_unregister(&sctpv6_prot);
+ goto out;
+}
+
+/* IPv6 specific exit support. */
+void sctp_v6_exit(void)
+{
+ list_del(&sctp_ipv6_specific.list);
+ inet6_del_protocol(&sctpv6_protocol, IPPROTO_SCTP);
+ inet6_unregister_protosw(&sctpv6_seqpacket_protosw);
+ inet6_unregister_protosw(&sctpv6_stream_protosw);
+ unregister_inet6addr_notifier(&sctp_inet6addr_notifier);
+ proto_unregister(&sctpv6_prot);
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-03 10:45:12 +0000