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[SCTP]: Include ulpevents in socket receive buffer accounting.

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Also introduces a sysctl option to configure the receive buffer
accounting policy to be either at socket or association level.
Default is all the associations on the same socket share the
receive buffer.

Signed-off-by: Neil Horman <nhorman@tuxdriver.com>
Signed-off-by: Sridhar Samudrala <sri@us.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Neil Horman
2005-11-11 16:08:24 -08:00
committed by David S. Miller
parent 19c7e9eef5
commit 049b3ff5a8
10 changed files with 71 additions and 39 deletions
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22
net/sctp/sm_statefuns.c
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@@ -5160,6 +5160,8 @@ static int sctp_eat_data(const struct sctp_association *asoc,
sctp_verb_t deliver;
int tmp;
__u32 tsn;
int account_value;
struct sock *sk = asoc->base.sk;
data_hdr = chunk->subh.data_hdr = (sctp_datahdr_t *)chunk->skb->data;
skb_pull(chunk->skb, sizeof(sctp_datahdr_t));
@@ -5169,6 +5171,26 @@ static int sctp_eat_data(const struct sctp_association *asoc,
/* ASSERT: Now skb->data is really the user data. */
/*
* if we are established, and we have used up our receive
* buffer memory, drop the frame
*/
if (asoc->state == SCTP_STATE_ESTABLISHED) {
/*
* If the receive buffer policy is 1, then each
* association can allocate up to sk_rcvbuf bytes
* otherwise, all the associations in aggregate
* may allocate up to sk_rcvbuf bytes
*/
if (asoc->ep->rcvbuf_policy)
account_value = atomic_read(&asoc->rmem_alloc);
else
account_value = atomic_read(&sk->sk_rmem_alloc);
if (account_value > sk->sk_rcvbuf)
return SCTP_IERROR_IGNORE_TSN;
}
/* Process ECN based congestion.
*
* Since the chunk structure is reused for all chunks within