ipv6: Add redirect support to all protocol icmp error handlers.

Signed-off-by: David S. Miller <davem@davemloft.net>

13 files changed, 69 insertions, 14 deletions

diff --git a/include/net/sctp/sctp.h b/include/net/sctp/sctp.h
index a2ef81466b00..1f2735dba753 100644
--- a/include/net/sctp/sctp.h
+++ b/include/net/sctp/sctp.h
@@ -162,6 +162,8 @@ struct sock *sctp_err_lookup(int family, struct sk_buff *,
 void sctp_err_finish(struct sock *, struct sctp_association *);
 void sctp_icmp_frag_needed(struct sock *, struct sctp_association *,
 			   struct sctp_transport *t, __u32 pmtu);
+void sctp_icmp_redirect(struct sock *, struct sctp_transport *,
+			struct sk_buff *);
 void sctp_icmp_proto_unreachable(struct sock *sk,
 				 struct sctp_association *asoc,
 				 struct sctp_transport *t);
diff --git a/net/dccp/ipv6.c b/net/dccp/ipv6.c
index 02162cfa5048..b4d7d28ce6d2 100644
--- a/net/dccp/ipv6.c
+++ b/net/dccp/ipv6.c
@@ -130,6 +130,13 @@ static void dccp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	np = inet6_sk(sk);
 
+	if (type == NDISC_REDIRECT) {
+		struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
+
+		if (dst && dst->ops->redirect)
+			dst->ops->redirect(dst, skb);
+	}
+
 	if (type == ICMPV6_PKT_TOOBIG) {
 		struct dst_entry *dst = NULL;
 
diff --git a/net/ipv6/ah6.c b/net/ipv6/ah6.c
index 49d4d26bda88..7e6139508ee7 100644
--- a/net/ipv6/ah6.c
+++ b/net/ipv6/ah6.c
@@ -613,16 +613,18 @@ static void ah6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	struct xfrm_state *x;
 
 	if (type != ICMPV6_DEST_UNREACH &&
-	    type != ICMPV6_PKT_TOOBIG)
+	    type != ICMPV6_PKT_TOOBIG &&
+	    type != NDISC_REDIRECT)
 		return;
 
 	x = xfrm_state_lookup(net, skb->mark, (xfrm_address_t *)&iph->daddr, ah->spi, IPPROTO_AH, AF_INET6);
 	if (!x)
 		return;
 
-	NETDEBUG(KERN_DEBUG "pmtu discovery on SA AH/%08x/%pI6\n",
-		 ntohl(ah->spi), &iph->daddr);
-	ip6_update_pmtu(skb, net, info, 0, 0);
+	if (type == NDISC_REDIRECT)
+		ip6_redirect(skb, net, 0, 0);
+	else
+		ip6_update_pmtu(skb, net, info, 0, 0);
 	xfrm_state_put(x);
 }
 
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 89a615ba84f8..6dc7fd353ef5 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -434,16 +434,19 @@ static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	struct xfrm_state *x;
 
 	if (type != ICMPV6_DEST_UNREACH &&
-	    type != ICMPV6_PKT_TOOBIG)
+	    type != ICMPV6_PKT_TOOBIG &&
+	    type != NDISC_REDIRECT)
 		return;
 
 	x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
 			      esph->spi, IPPROTO_ESP, AF_INET6);
 	if (!x)
 		return;
-	pr_debug("pmtu discovery on SA ESP/%08x/%pI6\n",
-		 ntohl(esph->spi), &iph->daddr);
-	ip6_update_pmtu(skb, net, info, 0, 0);
+
+	if (type == NDISC_REDIRECT)
+		ip6_redirect(skb, net, 0, 0);
+	else
+		ip6_update_pmtu(skb, net, info, 0, 0);
 	xfrm_state_put(x);
 }
 
diff --git a/net/ipv6/ip6_tunnel.c b/net/ipv6/ip6_tunnel.c
index 6af3fcfdcbbd..0b5b60ec6f4a 100644
--- a/net/ipv6/ip6_tunnel.c
+++ b/net/ipv6/ip6_tunnel.c
@@ -550,6 +550,9 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		rel_type = ICMP_DEST_UNREACH;
 		rel_code = ICMP_FRAG_NEEDED;
 		break;
+	case NDISC_REDIRECT:
+		rel_type = ICMP_REDIRECT;
+		rel_code = ICMP_REDIR_HOST;
 	default:
 		return 0;
 	}
@@ -608,6 +611,10 @@ ip4ip6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 		skb_dst(skb2)->ops->update_pmtu(skb_dst(skb2), rel_info);
 	}
+	if (rel_type == ICMP_REDIRECT) {
+		if (skb_dst(skb2)->ops->redirect)
+			skb_dst(skb2)->ops->redirect(skb_dst(skb2), skb2);
+	}
 
 	icmp_send(skb2, rel_type, rel_code, htonl(rel_info));
 
diff --git a/net/ipv6/ipcomp6.c b/net/ipv6/ipcomp6.c
index 92832385a8ef..7af5aee75d98 100644
--- a/net/ipv6/ipcomp6.c
+++ b/net/ipv6/ipcomp6.c
@@ -64,7 +64,9 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 		(struct ip_comp_hdr *)(skb->data + offset);
 	struct xfrm_state *x;
 
-	if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
+	if (type != ICMPV6_DEST_UNREACH &&
+	    type != ICMPV6_PKT_TOOBIG &&
+	    type != NDISC_REDIRECT)
 		return;
 
 	spi = htonl(ntohs(ipcomph->cpi));
@@ -73,9 +75,10 @@ static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 	if (!x)
 		return;
 
-	pr_debug("pmtu discovery on SA IPCOMP/%08x/%pI6\n",
-		 spi, &iph->daddr);
-	ip6_update_pmtu(skb, net, info, 0, 0);
+	if (type == NDISC_REDIRECT)
+		ip6_redirect(skb, net, 0, 0);
+	else
+		ip6_update_pmtu(skb, net, info, 0, 0);
 	xfrm_state_put(x);
 }
 
diff --git a/net/ipv6/raw.c b/net/ipv6/raw.c
index b5c1dcb27737..ef0579d5bca6 100644
--- a/net/ipv6/raw.c
+++ b/net/ipv6/raw.c
@@ -332,6 +332,8 @@ static void rawv6_err(struct sock *sk, struct sk_buff *skb,
 		ip6_sk_update_pmtu(skb, sk, info);
 		harderr = (np->pmtudisc == IPV6_PMTUDISC_DO);
 	}
+	if (type == NDISC_REDIRECT)
+		ip6_sk_redirect(skb, sk);
 	if (np->recverr) {
 		u8 *payload = skb->data;
 		if (!inet->hdrincl)
diff --git a/net/ipv6/sit.c b/net/ipv6/sit.c
index 49aea94c9be3..fbf1622fdeef 100644
--- a/net/ipv6/sit.c
+++ b/net/ipv6/sit.c
@@ -539,6 +539,8 @@ static int ipip6_err(struct sk_buff *skb, u32 info)
 		if (code != ICMP_EXC_TTL)
 			return 0;
 		break;
+	case ICMP_REDIRECT:
+		break;
 	}
 
 	err = -ENOENT;
@@ -557,6 +559,12 @@ static int ipip6_err(struct sk_buff *skb, u32 info)
 		err = 0;
 		goto out;
 	}
+	if (type == ICMP_REDIRECT) {
+		ipv4_redirect(skb, dev_net(skb->dev), t->dev->ifindex, 0,
+			      IPPROTO_IPV6, 0);
+		err = 0;
+		goto out;
+	}
 
 	if (t->parms.iph.daddr == 0)
 		goto out;
diff --git a/net/ipv6/tcp_ipv6.c b/net/ipv6/tcp_ipv6.c
index 70458a9cd837..7249e4bb9b8a 100644
--- a/net/ipv6/tcp_ipv6.c
+++ b/net/ipv6/tcp_ipv6.c
@@ -363,6 +363,13 @@ static void tcp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	np = inet6_sk(sk);
 
+	if (type == NDISC_REDIRECT) {
+		struct dst_entry *dst = __sk_dst_check(sk, np->dst_cookie);
+
+		if (dst && dst->ops->redirect)
+			dst->ops->redirect(dst,skb);
+	}
+
 	if (type == ICMPV6_PKT_TOOBIG) {
 		struct dst_entry *dst;
 
diff --git a/net/ipv6/udp.c b/net/ipv6/udp.c
index 1ecd10249488..99d0077b56b8 100644
--- a/net/ipv6/udp.c
+++ b/net/ipv6/udp.c
@@ -483,6 +483,8 @@ void __udp6_lib_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 
 	if (type == ICMPV6_PKT_TOOBIG)
 		ip6_sk_update_pmtu(skb, sk, info);
+	if (type == NDISC_REDIRECT)
+		ip6_sk_redirect(skb, sk);
 
 	np = inet6_sk(sk);
 
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index bb02038b822b..f5a9cb8257b9 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -215,6 +215,14 @@ static void xfrm6_update_pmtu(struct dst_entry *dst, u32 mtu)
 	path->ops->update_pmtu(path, mtu);
 }
 
+static void xfrm6_redirect(struct dst_entry *dst, struct sk_buff *skb)
+{
+	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
+	struct dst_entry *path = xdst->route;
+
+	path->ops->redirect(path, skb);
+}
+
 static void xfrm6_dst_destroy(struct dst_entry *dst)
 {
 	struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
@@ -261,6 +269,7 @@ static struct dst_ops xfrm6_dst_ops = {
 	.protocol =		cpu_to_be16(ETH_P_IPV6),
 	.gc =			xfrm6_garbage_collect,
 	.update_pmtu =		xfrm6_update_pmtu,
+	.redirect =		xfrm6_redirect,
 	.cow_metrics =		dst_cow_metrics_generic,
 	.destroy =		xfrm6_dst_destroy,
 	.ifdown =		xfrm6_dst_ifdown,
diff --git a/net/sctp/input.c b/net/sctp/input.c
index 9fb4247f9a99..5943b7d77ddb 100644
--- a/net/sctp/input.c
+++ b/net/sctp/input.c
@@ -423,8 +423,8 @@ void sctp_icmp_frag_needed(struct sock *sk, struct sctp_association *asoc,
 	sctp_retransmit(&asoc->outqueue, t, SCTP_RTXR_PMTUD);
 }
 
-static void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
-			       struct sk_buff *skb)
+void sctp_icmp_redirect(struct sock *sk, struct sctp_transport *t,
+			struct sk_buff *skb)
 {
 	struct dst_entry *dst;
 
diff --git a/net/sctp/ipv6.c b/net/sctp/ipv6.c
index 91f479121c55..ed7139ea7978 100644
--- a/net/sctp/ipv6.c
+++ b/net/sctp/ipv6.c
@@ -185,6 +185,9 @@ SCTP_STATIC void sctp_v6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
 			goto out_unlock;
 		}
 		break;
+	case NDISC_REDIRECT:
+		sctp_icmp_redirect(sk, transport, skb);
+		break;
 	default:
 		break;
 	}