netdev - [PATCH net v2] ping: fix address binding wrt vrf

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Message-Id: <20220429082021.10294-1-nicolas.dichtel@6wind.com>
Date:   Fri, 29 Apr 2022 10:20:21 +0200
From:   Nicolas Dichtel <nicolas.dichtel@...nd.com>
To:     David Miller <davem@...emloft.net>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>,
        Eric Dumazet <edumazet@...gle.com>
Cc:     David Ahern <dsahern@...nel.org>, netdev@...r.kernel.org,
        Nicolas Dichtel <nicolas.dichtel@...nd.com>,
        stable@...r.kernel.org
Subject: [PATCH net v2] ping: fix address binding wrt vrf

When ping_group_range is updated, 'ping' uses the DGRAM ICMP socket,
instead of an IP raw socket. In this case, 'ping' is unable to bind its
socket to a local address owned by a vrflite.

Before the patch:
$ sysctl -w net.ipv4.ping_group_range='0  2147483647'
$ ip link add blue type vrf table 10
$ ip link add foo type dummy
$ ip link set foo master blue
$ ip link set foo up
$ ip addr add 192.168.1.1/24 dev foo
$ ip vrf exec blue ping -c1 -I 192.168.1.1 192.168.1.2
ping: bind: Cannot assign requested address

CC: stable@...r.kernel.org
Fixes: 1b69c6d0ae90 ("net: Introduce L3 Master device abstraction")
Signed-off-by: Nicolas Dichtel <nicolas.dichtel@...nd.com>
---

v1 -> v2:
 add the tag "Cc: stable@...r.kernel.org" for correct stable submission

 net/ipv4/ping.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/net/ipv4/ping.c b/net/ipv4/ping.c
index 3ee947557b88..9ea326b50775 100644
--- a/net/ipv4/ping.c
+++ b/net/ipv4/ping.c
@@ -305,6 +305,7 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
 	struct net *net = sock_net(sk);
 	if (sk->sk_family == AF_INET) {
 		struct sockaddr_in *addr = (struct sockaddr_in *) uaddr;
+		u32 tb_id = RT_TABLE_LOCAL;
 		int chk_addr_ret;
 
 		if (addr_len < sizeof(*addr))
@@ -318,7 +319,8 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
 		pr_debug("ping_check_bind_addr(sk=%p,addr=%pI4,port=%d)\n",
 			 sk, &addr->sin_addr.s_addr, ntohs(addr->sin_port));
 
-		chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
+		tb_id = l3mdev_fib_table_by_index(net, sk->sk_bound_dev_if) ? : tb_id;
+		chk_addr_ret = inet_addr_type_table(net, addr->sin_addr.s_addr, tb_id);
 
 		if (!inet_addr_valid_or_nonlocal(net, inet_sk(sk),
 					         addr->sin_addr.s_addr,
-- 
2.33.0