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sctp: add refcnt support for sh_key

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With refcnt support for sh_key, chunks auth sh_keys can be decided
before enqueuing it. Changing the active key later will not affect
the chunks already enqueued.

Furthermore, this is necessary when adding the support for authinfo
for sendmsg in next patch.

Note that struct sctp_chunk can't be grown due to that performance
drop issue on slow cpu, so it just reuses head_skb memory for shkey
in sctp_chunk.

Signed-off-by: Xin Long <lucien.xin@gmail.com>
Acked-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Xin Long
2018-03-14 19:05:30 +08:00
committed by David S. Miller
parent c469012729
commit 1b1e0bc994
9 changed files with 105 additions and 59 deletions
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6
net/sctp/socket.c
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@@ -156,6 +156,9 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk)
/* The sndbuf space is tracked per association. */
sctp_association_hold(asoc);
if (chunk->shkey)
sctp_auth_shkey_hold(chunk->shkey);
skb_set_owner_w(chunk->skb, sk);
chunk->skb->destructor = sctp_wfree;
@@ -8109,6 +8112,9 @@ static void sctp_wfree(struct sk_buff *skb)
sk->sk_wmem_queued -= skb->truesize;
sk_mem_uncharge(sk, skb->truesize);
if (chunk->shkey)
sctp_auth_shkey_release(chunk->shkey);
sock_wfree(skb);
sctp_wake_up_waiters(sk, asoc);