--- zzzz-none-000/linux-3.10.107/net/sctp/ipv6.c	2017-06-27 09:49:32.000000000 +0000
+++ scorpion-7490-727/linux-3.10.107/net/sctp/ipv6.c	2021-02-04 17:41:59.000000000 +0000
@@ -21,16 +21,12 @@
  * 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.
+ * 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 <lksctp-developers@lists.sourceforge.net>
- *
- * Or submit a bug report through the following website:
- *    http://www.sf.net/projects/lksctp
+ *    lksctp developers <linux-sctp@vger.kernel.org>
  *
  * Written or modified by:
  *    Le Yanqun		    <yanqun.le@nokia.com>
@@ -42,9 +38,6 @@
  *
  * 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.
  */
 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
@@ -145,15 +138,15 @@
 };
 
 /* ICMP error handler. */
-SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
-			     u8 type, u8 code, int offset, __be32 info)
+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;
-	sk_buff_data_t saveip, savesctp;
+	__u16 saveip, savesctp;
 	int err;
 	struct net *net = dev_net(skb->dev);
 
@@ -179,7 +172,8 @@
 
 	switch (type) {
 	case ICMPV6_PKT_TOOBIG:
-		sctp_icmp_frag_needed(sk, asoc, transport, ntohl(info));
+		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) {
@@ -215,19 +209,22 @@
 	struct sock *sk = skb->sk;
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct flowi6 *fl6 = &transport->fl.u.ip6;
+	int res;
 
-	SCTP_DEBUG_PRINTK("%s: skb:%p, len:%d, src:%pI6 dst:%pI6\n",
-			  __func__, skb, skb->len,
-			  &fl6->saddr, &fl6->daddr);
+	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->local_df = 1;
+		skb->ignore_df = 1;
 
 	SCTP_INC_STATS(sock_net(sk), SCTP_MIB_OUTSCTPPACKS);
 
-	return ip6_xmit(sk, skb, fl6, np->opt, np->tclass);
+	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
@@ -257,7 +254,7 @@
 	if (ipv6_addr_type(&daddr->v6.sin6_addr) & IPV6_ADDR_LINKLOCAL)
 		fl6->flowi6_oif = daddr->v6.sin6_scope_id;
 
-	SCTP_DEBUG_PRINTK("%s: DST=%pI6 ", __func__, &fl6->daddr);
+	pr_debug("%s: dst=%pI6 ", __func__, &fl6->daddr);
 
 	if (asoc)
 		fl6->fl6_sport = htons(asoc->base.bind_addr.port);
@@ -265,11 +262,15 @@
 	if (saddr) {
 		fl6->saddr = saddr->v6.sin6_addr;
 		fl6->fl6_sport = saddr->v6.sin6_port;
-		SCTP_DEBUG_PRINTK("SRC=%pI6 - ", &fl6->saddr);
+
+		pr_debug("src=%pI6 - ", &fl6->saddr);
 	}
 
-	final_p = fl6_update_dst(fl6, np->opt, &final);
-	dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
+	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;
 
@@ -285,7 +286,9 @@
 		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_SRC))
+			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 */
@@ -320,25 +323,28 @@
 			}
 		}
 	}
-	rcu_read_unlock();
-
 	if (baddr) {
 		fl6->saddr = baddr->v6.sin6_addr;
 		fl6->fl6_sport = baddr->v6.sin6_port;
-		final_p = fl6_update_dst(fl6, np->opt, &final);
-		dst = ip6_dst_lookup_flow(sk, fl6, final_p, false);
+		final_p = fl6_update_dst(fl6, rcu_dereference(np->opt), &final);
+		dst = ip6_dst_lookup_flow(sk, fl6, final_p);
 	}
+	rcu_read_unlock();
 
 out:
 	if (!IS_ERR_OR_NULL(dst)) {
 		struct rt6_info *rt;
+
 		rt = (struct rt6_info *)dst;
 		t->dst = dst;
-		SCTP_DEBUG_PRINTK("rt6_dst:%pI6 rt6_src:%pI6\n",
-			&rt->rt6i_dst.addr, &fl6->saddr);
+		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;
-		SCTP_DEBUG_PRINTK("NO ROUTE\n");
+
+		pr_debug("no route\n");
 	}
 }
 
@@ -361,7 +367,7 @@
 	struct flowi6 *fl6 = &fl->u.ip6;
 	union sctp_addr *saddr = &t->saddr;
 
-	SCTP_DEBUG_PRINTK("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
+	pr_debug("%s: asoc:%p dst:%p\n", __func__, t->asoc, t->dst);
 
 	if (t->dst) {
 		saddr->v6.sin6_family = AF_INET6;
@@ -386,7 +392,7 @@
 	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 = t_new(struct sctp_sockaddr_entry, GFP_ATOMIC);
+		addr = kzalloc(sizeof(*addr), GFP_ATOMIC);
 		if (addr) {
 			addr->a.v6.sin6_family = AF_INET6;
 			addr->a.v6.sin6_port = 0;
@@ -403,7 +409,7 @@
 }
 
 /* Initialize a sockaddr_storage from in incoming skb. */
-static void sctp_v6_from_skb(union sctp_addr *addr,struct sk_buff *skb,
+static void sctp_v6_from_skb(union sctp_addr *addr, struct sk_buff *skb,
 			     int is_saddr)
 {
 	__be16 *port;
@@ -429,33 +435,33 @@
 {
 	addr->v6.sin6_family = AF_INET6;
 	addr->v6.sin6_port = 0;
-	addr->v6.sin6_addr = inet6_sk(sk)->rcv_saddr;
+	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 && 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] =
+	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 {
-		inet6_sk(sk)->rcv_saddr = addr->v6.sin6_addr;
+		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 && 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;
+	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 {
-		inet6_sk(sk)->daddr = addr->v6.sin6_addr;
+		sk->sk_v6_daddr = addr->v6.sin6_addr;
 	}
 }
 
@@ -559,8 +565,6 @@
 	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);
@@ -590,8 +594,6 @@
 		/* 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);
@@ -643,7 +645,7 @@
 	struct sctp6_sock *newsctp6sk;
 	struct ipv6_txoptions *opt;
 
-	newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot);
+	newsk = sk_alloc(sock_net(sk), PF_INET6, GFP_KERNEL, sk->sk_prot, 0);
 	if (!newsk)
 		goto out;
 
@@ -673,6 +675,8 @@
 	 */
 	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)) {
@@ -684,11 +688,23 @@
 	return newsk;
 }
 
-/* Map v4 address to mapped v6 address */
-static void sctp_v6_addr_v4map(struct sctp_sock *sp, union sctp_addr *addr)
+/* 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 && AF_INET == addr->sa.sa_family)
-		sctp_v4_map_v6(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?  */
@@ -715,82 +731,68 @@
 	inet6_sk(sk)->tclass |= INET_ECN_ECT_0;
 }
 
-/* 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.
-		 */
+	union sctp_addr *addr;
+	struct sctp_association *asoc;
+	union sctp_addr *paddr;
 
-		/* 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;
-		}
+	if (!msgname)
+		return;
 
-		sin6from = &asoc->peer.primary_addr.v6;
-		sin6->sin6_addr = sin6from->sin6_addr;
-		if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL)
-			sin6->sin6_scope_id = sin6from->sin6_scope_id;
+	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;
-	struct sockaddr_in6 *sin6;
 
-	if (msgname) {
-		sctp_inet6_msgname(msgname, addr_len);
-		sin6 = (struct sockaddr_in6 *)msgname;
-		sh = sctp_hdr(skb);
-		sin6->sin6_port = sh->source;
-
-		/* Map ipv4 address into v4-mapped-on-v6 address. */
-		if (sctp_sk(skb->sk)->v4mapped &&
-		    ip_hdr(skb)->version == 4) {
-			sctp_v4_map_v6((union sctp_addr *)sin6);
-			sin6->sin6_addr.s6_addr32[3] = ip_hdr(skb)->saddr;
-			return;
-		}
-
-		/* Otherwise, just copy the v6 address. */
-		sin6->sin6_addr = ipv6_hdr(skb)->saddr;
-		if (ipv6_addr_type(&sin6->sin6_addr) & IPV6_ADDR_LINKLOCAL) {
+	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);
-			sin6->sin6_scope_id = ev->iif;
+			addr->v6.sin6_scope_id = ev->iif;
 		}
 	}
+
+	*addr_len = sctp_v6_addr_to_user(sctp_sk(skb->sk), addr);
 }
 
 /* Do we support this AF? */
@@ -866,9 +868,6 @@
 				return 0;
 			}
 			rcu_read_unlock();
-		} else if (type == IPV6_ADDR_MAPPED) {
-			if (!opt->v4mapped)
-				return 0;
 		}
 
 		af = opt->pf->af;
@@ -923,6 +922,23 @@
 	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,
@@ -931,7 +947,7 @@
 	.connect	   = inet_dgram_connect,
 	.socketpair	   = sock_no_socketpair,
 	.accept		   = inet_accept,
-	.getname	   = inet6_getname,
+	.getname	   = sctp_getname,
 	.poll		   = sctp_poll,
 	.ioctl		   = inet6_ioctl,
 	.listen		   = sctp_inet_listen,
@@ -952,7 +968,6 @@
 	.protocol      = IPPROTO_SCTP,
 	.prot 	       = &sctpv6_prot,
 	.ops           = &inet6_seqpacket_ops,
-	.no_check      = 0,
 	.flags         = SCTP_PROTOSW_FLAG
 };
 static struct inet_protosw sctpv6_stream_protosw = {
@@ -960,7 +975,6 @@
 	.protocol      = IPPROTO_SCTP,
 	.prot 	       = &sctpv6_prot,
 	.ops           = &inet6_seqpacket_ops,
-	.no_check      = 0,
 	.flags         = SCTP_PROTOSW_FLAG,
 };
 
@@ -985,8 +999,6 @@
 	.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,
 	.cmp_addr	   = sctp_v6_cmp_addr,
@@ -1016,7 +1028,9 @@
 	.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,
+	.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,
 };