netdev - [PATCH net] net: ipv6: Fix ping to link-local addresses.

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Date:	Mon,  8 Aug 2016 16:42:07 +0900
From:	Lorenzo Colitti <lorenzo@...gle.com>
To:	netdev@...r.kernel.org
Cc:	hannes@...essinduktion.org, ek@...gle.com, davem@...emloft.net,
	hideaki.yoshifuji@...aclelinux.com,
	Lorenzo Colitti <lorenzo@...gle.com>
Subject: [PATCH net] net: ipv6: Fix ping to link-local addresses.

ping_v6_sendmsg never sets flowi6_oif, so it is not possible to
ping an IPv6 address on a different interface. Instead, it sets
flowi6_iif, which is incorrect but harmless. Also, it returns an
error if a passed-in scope ID doesn't match sk_bound_dev_if.

Get rid of the error, stop setting flowi6_iif, and support
various ways of setting oif in the same priority order used by
udpv6_sendmsg.

Tested: https://android-review.googlesource.com/#/c/254470/
Signed-off-by: Lorenzo Colitti <lorenzo@...gle.com>
---
 net/ipv6/ping.c | 29 +++++++++++++++--------------
 1 file changed, 15 insertions(+), 14 deletions(-)

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index fed40d1..eabf1ea 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -55,7 +55,7 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	struct icmp6hdr user_icmph;
 	int addr_type;
 	struct in6_addr *daddr;
-	int iif = 0;
+	int oif = 0;
 	struct flowi6 fl6;
 	int err;
 	struct dst_entry *dst;
@@ -78,23 +78,28 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 		if (u->sin6_family != AF_INET6) {
 			return -EAFNOSUPPORT;
 		}
-		if (sk->sk_bound_dev_if &&
-		    sk->sk_bound_dev_if != u->sin6_scope_id) {
-			return -EINVAL;
-		}
 		daddr = &(u->sin6_addr);
-		iif = u->sin6_scope_id;
+		if (__ipv6_addr_needs_scope_id(ipv6_addr_type(daddr)))
+			oif = u->sin6_scope_id;
 	} else {
 		if (sk->sk_state != TCP_ESTABLISHED)
 			return -EDESTADDRREQ;
 		daddr = &sk->sk_v6_daddr;
 	}
 
-	if (!iif)
-		iif = sk->sk_bound_dev_if;
+	if (!oif)
+		oif = sk->sk_bound_dev_if;
+
+	if (!oif)
+		oif = np->sticky_pktinfo.ipi6_ifindex;
+
+	if (!oif && ipv6_addr_is_multicast(daddr))
+		fl6.flowi6_oif = np->mcast_oif;
+	else if (!oif)
+		oif = np->ucast_oif;
 
 	addr_type = ipv6_addr_type(daddr);
-	if (__ipv6_addr_needs_scope_id(addr_type) && !iif)
+	if (__ipv6_addr_needs_scope_id(addr_type) && !oif)
 		return -EINVAL;
 	if (addr_type & IPV6_ADDR_MAPPED)
 		return -EINVAL;
@@ -106,16 +111,12 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	fl6.flowi6_proto = IPPROTO_ICMPV6;
 	fl6.saddr = np->saddr;
 	fl6.daddr = *daddr;
+	fl6.flowi6_oif = oif;
 	fl6.flowi6_mark = sk->sk_mark;
 	fl6.fl6_icmp_type = user_icmph.icmp6_type;
 	fl6.fl6_icmp_code = user_icmph.icmp6_code;
 	security_sk_classify_flow(sk, flowi6_to_flowi(&fl6));
 
-	if (!fl6.flowi6_oif && ipv6_addr_is_multicast(&fl6.daddr))
-		fl6.flowi6_oif = np->mcast_oif;
-	else if (!fl6.flowi6_oif)
-		fl6.flowi6_oif = np->ucast_oif;
-
 	ipc6.tclass = np->tclass;
 	fl6.flowlabel = ip6_make_flowinfo(ipc6.tclass, fl6.flowlabel);
 
-- 
2.8.0.rc3.226.g39d4020