netdev - [PATCH net V2] net: ping6: Fix ping -6 with interface name

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Date:   Sun, 29 May 2022 14:50:33 +0300
From:   Tariq Toukan <tariqt@...dia.com>
To:     "David S. Miller" <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Eric Dumazet <edumazet@...gle.com>,
        David Ahern <dsahern@...nel.org>
CC:     <netdev@...r.kernel.org>, Aya Levin <ayal@...dia.com>,
        Gal Pressman <gal@...dia.com>,
        Saeed Mahameed <saeedm@...dia.com>,
        Tariq Toukan <tariqt@...dia.com>
Subject: [PATCH net V2] net: ping6: Fix ping -6 with interface name

From: Aya Levin <ayal@...dia.com>

When passing interface parameter to ping -6:
$ ping -6 ::11:141:84:9 -I eth2
Results in:
PING ::11:141:84:10(::11:141:84:10) from ::11:141:84:9 eth2: 56 data bytes
ping: sendmsg: Invalid argument
ping: sendmsg: Invalid argument

Initialize the fl6's outgoing interface (OIF) before triggering
ip6_datagram_send_ctl. Don't wipe fl6 after ip6_datagram_send_ctl() as
changes in fl6 that may happen in the function are overwritten explicitly.
Update comment accordingly.

Fixes: 13651224c00b ("net: ping6: support setting basic SOL_IPV6 options via cmsg")
Signed-off-by: Aya Levin <ayal@...dia.com>
Reviewed-by: Gal Pressman <gal@...dia.com>
Reviewed-by: Saeed Mahameed <saeedm@...dia.com>
Signed-off-by: Tariq Toukan <tariqt@...dia.com>
---
 net/ipv6/ping.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

V2:
Per David Ahern's comment, moved memset before if (msg->msg_controllen),
and updated the code comment accordingly.

diff --git a/net/ipv6/ping.c b/net/ipv6/ping.c
index ff033d16549e..2a5f3337d488 100644
--- a/net/ipv6/ping.c
+++ b/net/ipv6/ping.c
@@ -101,24 +101,25 @@ static int ping_v6_sendmsg(struct sock *sk, struct msghdr *msg, size_t len)
 	ipc6.sockc.tsflags = sk->sk_tsflags;
 	ipc6.sockc.mark = sk->sk_mark;
 
+	memset(&fl6, 0, sizeof(fl6));
+
 	if (msg->msg_controllen) {
 		struct ipv6_txoptions opt = {};
 
 		opt.tot_len = sizeof(opt);
 		ipc6.opt = &opt;
+		fl6.flowi6_oif = oif;
 
 		err = ip6_datagram_send_ctl(sock_net(sk), sk, msg, &fl6, &ipc6);
 		if (err < 0)
 			return err;
 
 		/* Changes to txoptions and flow info are not implemented, yet.
-		 * Drop the options, fl6 is wiped below.
+		 * Drop the options.
 		 */
 		ipc6.opt = NULL;
 	}
 
-	memset(&fl6, 0, sizeof(fl6));
-
 	fl6.flowi6_proto = IPPROTO_ICMPV6;
 	fl6.saddr = np->saddr;
 	fl6.daddr = *daddr;
-- 
2.21.0