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mptcp: add msk interations helper

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mptcp_token_iter_next() allow traversing all the MPTCP
sockets inside the token container belonging to the given
network namespace with a quite standard iterator semantic.

That will be used by the next patch, but keep the API generic,
as we plan to use this later for PM's sake.

Additionally export mptcp_token_get_sock(), as it also
will be used by the diag module.

Reviewed-by: Mat Martineau <mathew.j.martineau@linux.intel.com>
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Paolo Abeni 2020-07-09 15:12:40 +02:00 committed by David S. Miller
parent 3f935c75eb
commit 96d890daad
2 changed files with 62 additions and 1 deletions
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2
net/mptcp/protocol.h
View File

@ -391,6 +391,8 @@ int mptcp_token_new_connect(struct sock *sk);
void mptcp_token_accept(struct mptcp_subflow_request_sock *r,
struct mptcp_sock *msk);
struct mptcp_sock *mptcp_token_get_sock(u32 token);
struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
long *s_num);
void mptcp_token_destroy(struct mptcp_sock *msk);
void mptcp_crypto_key_sha(u64 key, u32 *token, u64 *idsn);

61
net/mptcp/token.c
View File

@ -238,6 +238,66 @@ found:
rcu_read_unlock();
return msk;
}
EXPORT_SYMBOL_GPL(mptcp_token_get_sock);
/**
* mptcp_token_iter_next - iterate over the token container from given pos
* @net: namespace to be iterated
* @s_slot: start slot number
* @s_num: start number inside the given lock
*
* This function returns the first mptcp connection structure found inside the
* token container starting from the specified position, or NULL.
*
* On successful iteration, the iterator is move to the next position and the
* the acquires a reference to the returned socket.
*/
struct mptcp_sock *mptcp_token_iter_next(const struct net *net, long *s_slot,
long *s_num)
{
struct mptcp_sock *ret = NULL;
struct hlist_nulls_node *pos;
int slot, num;
for (slot = *s_slot; slot <= token_mask; *s_num = 0, slot++) {
struct token_bucket *bucket = &token_hash[slot];
struct sock *sk;
num = 0;
if (hlist_nulls_empty(&bucket->msk_chain))
continue;
rcu_read_lock();
sk_nulls_for_each_rcu(sk, pos, &bucket->msk_chain) {
++num;
if (!net_eq(sock_net(sk), net))
continue;
if (num <= *s_num)
continue;
if (!refcount_inc_not_zero(&sk->sk_refcnt))
continue;
if (!net_eq(sock_net(sk), net)) {
sock_put(sk);
continue;
}
ret = mptcp_sk(sk);
rcu_read_unlock();
goto out;
}
rcu_read_unlock();
}
out:
*s_slot = slot;
*s_num = num;
return ret;
}
EXPORT_SYMBOL_GPL(mptcp_token_iter_next);
/**
* mptcp_token_destroy_request - remove mptcp connection/token
@ -312,7 +372,6 @@ void __init mptcp_token_init(void)
EXPORT_SYMBOL_GPL(mptcp_token_new_request);
EXPORT_SYMBOL_GPL(mptcp_token_new_connect);
EXPORT_SYMBOL_GPL(mptcp_token_accept);
EXPORT_SYMBOL_GPL(mptcp_token_get_sock);
EXPORT_SYMBOL_GPL(mptcp_token_destroy_request);
EXPORT_SYMBOL_GPL(mptcp_token_destroy);
#endif