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mctp: Implement a timeout for tags

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Currently, a MCTP (local-eid,remote-eid,tag) tuple is allocated to a
socket on send, and only expires when the socket is closed.

This change introduces a tag timeout, freeing the tuple after a fixed
expiry - currently six seconds. This is greater than (but close to) the
max response timeout in upper-layer bindings.

Signed-off-by: Jeremy Kerr <jk@codeconstruct.com.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Jeremy Kerr
2021-09-29 15:26:09 +08:00
committed by David S. Miller
parent 43f55f23f7
commit 7b14e15ae6
3 changed files with 62 additions and 0 deletions
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44
net/mctp/af_mctp.c
View File

@@ -223,16 +223,60 @@ static const struct proto_ops mctp_dgram_ops = {
.sendpage = sock_no_sendpage,
};
static void mctp_sk_expire_keys(struct timer_list *timer)
{
struct mctp_sock *msk = container_of(timer, struct mctp_sock,
key_expiry);
struct net *net = sock_net(&msk->sk);
unsigned long next_expiry, flags;
struct mctp_sk_key *key;
struct hlist_node *tmp;
bool next_expiry_valid = false;
spin_lock_irqsave(&net->mctp.keys_lock, flags);
hlist_for_each_entry_safe(key, tmp, &msk->keys, sklist) {
spin_lock(&key->lock);
if (!time_after_eq(key->expiry, jiffies)) {
key->valid = false;
hlist_del_rcu(&key->hlist);
hlist_del_rcu(&key->sklist);
spin_unlock(&key->lock);
mctp_key_unref(key);
continue;
}
if (next_expiry_valid) {
if (time_before(key->expiry, next_expiry))
next_expiry = key->expiry;
} else {
next_expiry = key->expiry;
next_expiry_valid = true;
}
spin_unlock(&key->lock);
}
spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
if (next_expiry_valid)
mod_timer(timer, next_expiry);
}
static int mctp_sk_init(struct sock *sk)
{
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
INIT_HLIST_HEAD(&msk->keys);
timer_setup(&msk->key_expiry, mctp_sk_expire_keys, 0);
return 0;
}
static void mctp_sk_close(struct sock *sk, long timeout)
{
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
del_timer_sync(&msk->key_expiry);
sk_common_release(sk);
}