ping: fix address binding wrt vrf

JIRA: https://issues.redhat.com/browse/RHEL-50920
Upstream Status: linux.git
Conflicts:\
- Code differences due to missing upstream commit 8ff978b
  ("ipv4/raw: support binding to nonlocal addresses"); but the overall
  logic is the same.

commit e1a7ac6
Author: Nicolas Dichtel <nicolas.dichtel@6wind.com>
Date:   Wed May 4 11:07:38 2022 +0200

    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 addr add 2001::1/64 dev foo
    $ ip vrf exec blue ping -c1 -I 192.168.1.1 192.168.1.2
    ping: bind: Cannot assign requested address
    $ ip vrf exec blue ping6 -c1 -I 2001::1 2001::2
    ping6: bind icmp socket: Cannot assign requested address

    CC: stable@vger.kernel.org
    Fixes: 1b69c6d ("net: Introduce L3 Master device abstraction")
    Signed-off-by: Nicolas Dichtel <nicolas.dichtel@6wind.com>
    Reviewed-by: David Ahern <dsahern@kernel.org>
    Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Signed-off-by: Antoine Tenart <atenart@redhat.com>

Author: atenart

net/ipv4/ping.c

@@ -321,6 +321,7 @@ 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))
@@ -336,8 +337,10 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
 
 		if (addr->sin_addr.s_addr == htonl(INADDR_ANY))
 			chk_addr_ret = RTN_LOCAL;
-		else
-			chk_addr_ret = inet_addr_type(net, addr->sin_addr.s_addr);
+		else {
+			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_can_nonlocal_bind(net, isk) &&
 		     chk_addr_ret != RTN_LOCAL) ||
@@ -375,6 +378,14 @@ static int ping_check_bind_addr(struct sock *sk, struct inet_sock *isk,
 				return -ENODEV;
 			}
 		}
+
+		if (!dev && sk->sk_bound_dev_if) {
+			dev = dev_get_by_index_rcu(net, sk->sk_bound_dev_if);
+			if (!dev) {
+				rcu_read_unlock();
+				return -ENODEV;
+			}
+		}
 		has_addr = pingv6_ops.ipv6_chk_addr(net, &addr->sin6_addr, dev,
 						    scoped);
 		rcu_read_unlock();