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net: mctp: Treat MCTP_NET_ANY specially in bind()

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When a specific EID is passed as a bind address, it only makes sense to
interpret with an actual network ID, so resolve that to the default
network at bind time.

For bind address of MCTP_ADDR_ANY, we want to be able to capture traffic
to any network and address, so keep the current behaviour of matching
traffic from any network interface (don't interpret MCTP_NET_ANY as
the default network ID).

Signed-off-by: Matt Johnston <matt@codeconstruct.com.au>
Link: https://patch.msgid.link/20250710-mctp-bind-v4-3-8ec2f6460c56@codeconstruct.com.au
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
This commit is contained in:
Matt Johnston 2025-07-10 16:55:56 +08:00 committed by Paolo Abeni
parent 3954502377
commit 5000268c29
1 changed files with 15 additions and 1 deletions
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16
net/mctp/af_mctp.c
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@ -53,6 +53,7 @@ static int mctp_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
{
struct sock *sk = sock->sk;
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
struct net *net = sock_net(&msk->sk);
struct sockaddr_mctp *smctp;
int rc;
@ -77,8 +78,21 @@ static int mctp_bind(struct socket *sock, struct sockaddr *addr, int addrlen)
rc = -EADDRINUSE;
goto out_release;
}
msk->bind_net = smctp->smctp_network;
msk->bind_addr = smctp->smctp_addr.s_addr;
/* MCTP_NET_ANY with a specific EID is resolved to the default net
* at bind() time.
* For bind_addr=MCTP_ADDR_ANY it is handled specially at route
* lookup time.
*/
if (smctp->smctp_network == MCTP_NET_ANY &&
msk->bind_addr != MCTP_ADDR_ANY) {
msk->bind_net = mctp_default_net(net);
} else {
msk->bind_net = smctp->smctp_network;
}
msk->bind_type = smctp->smctp_type & 0x7f; /* ignore the IC bit */
rc = sk->sk_prot->hash(sk);