From 605c0ac182c34867bda71bfbcc74958aabbe2fe0 Mon Sep 17 00:00:00 2001 From: Xin Long Date: Wed, 17 Oct 2018 03:07:50 +0800 Subject: [PATCH] sctp: count both sk and asoc sndbuf with skb truesize and sctp_chunk size Now it's confusing that asoc sndbuf_used is doing memory accounting with SCTP_DATA_SNDSIZE(chunk) + sizeof(sk_buff) + sizeof(sctp_chunk) while sk sk_wmem_alloc is doing that with skb->truesize + sizeof(sctp_chunk). It also causes sctp_prsctp_prune to count with a wrong freed memory when sndbuf_policy is not set. To make this right and also keep consistent between asoc sndbuf_used, sk sk_wmem_alloc and sk_wmem_queued, use skb->truesize + sizeof(sctp_chunk) for them. Signed-off-by: Xin Long Signed-off-by: David S. Miller --- include/net/sctp/constants.h | 5 ----- net/sctp/outqueue.c | 8 ++------ net/sctp/socket.c | 21 ++++++--------------- 3 files changed, 8 insertions(+), 26 deletions(-) diff --git a/include/net/sctp/constants.h b/include/net/sctp/constants.h index 86f034b524d4..8dadc74c22e7 100644 --- a/include/net/sctp/constants.h +++ b/include/net/sctp/constants.h @@ -148,11 +148,6 @@ SCTP_SUBTYPE_CONSTRUCTOR(PRIMITIVE, enum sctp_event_primitive, primitive) #define sctp_chunk_is_data(a) (a->chunk_hdr->type == SCTP_CID_DATA || \ a->chunk_hdr->type == SCTP_CID_I_DATA) -/* Calculate the actual data size in a data chunk */ -#define SCTP_DATA_SNDSIZE(c) ((int)((unsigned long)(c->chunk_end) - \ - (unsigned long)(c->chunk_hdr) - \ - sctp_datachk_len(&c->asoc->stream))) - /* Internal error codes */ enum sctp_ierror { SCTP_IERROR_NO_ERROR = 0, diff --git a/net/sctp/outqueue.c b/net/sctp/outqueue.c index 42191ed9902b..9cb854b05342 100644 --- a/net/sctp/outqueue.c +++ b/net/sctp/outqueue.c @@ -385,9 +385,7 @@ static int sctp_prsctp_prune_sent(struct sctp_association *asoc, asoc->outqueue.outstanding_bytes -= sctp_data_size(chk); } - msg_len -= SCTP_DATA_SNDSIZE(chk) + - sizeof(struct sk_buff) + - sizeof(struct sctp_chunk); + msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk); if (msg_len <= 0) break; } @@ -421,9 +419,7 @@ static int sctp_prsctp_prune_unsent(struct sctp_association *asoc, streamout->ext->abandoned_unsent[SCTP_PR_INDEX(PRIO)]++; } - msg_len -= SCTP_DATA_SNDSIZE(chk) + - sizeof(struct sk_buff) + - sizeof(struct sctp_chunk); + msg_len -= chk->skb->truesize + sizeof(struct sctp_chunk); sctp_chunk_free(chk); if (msg_len <= 0) break; diff --git a/net/sctp/socket.c b/net/sctp/socket.c index f73e9d38d5ba..c6f29505c34d 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -166,12 +166,9 @@ static inline void sctp_set_owner_w(struct sctp_chunk *chunk) /* Save the chunk pointer in skb for sctp_wfree to use later. */ skb_shinfo(chunk->skb)->destructor_arg = chunk; - asoc->sndbuf_used += SCTP_DATA_SNDSIZE(chunk) + - sizeof(struct sk_buff) + - sizeof(struct sctp_chunk); - refcount_add(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc); - sk->sk_wmem_queued += chunk->skb->truesize; + asoc->sndbuf_used += chunk->skb->truesize + sizeof(struct sctp_chunk); + sk->sk_wmem_queued += chunk->skb->truesize + sizeof(struct sctp_chunk); sk_mem_charge(sk, chunk->skb->truesize); } @@ -8460,17 +8457,11 @@ static void sctp_wfree(struct sk_buff *skb) struct sctp_association *asoc = chunk->asoc; struct sock *sk = asoc->base.sk; - asoc->sndbuf_used -= SCTP_DATA_SNDSIZE(chunk) + - sizeof(struct sk_buff) + - sizeof(struct sctp_chunk); - - WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), &sk->sk_wmem_alloc)); - - /* - * This undoes what is done via sctp_set_owner_w and sk_mem_charge - */ - sk->sk_wmem_queued -= skb->truesize; sk_mem_uncharge(sk, skb->truesize); + sk->sk_wmem_queued -= skb->truesize + sizeof(struct sctp_chunk); + asoc->sndbuf_used -= skb->truesize + sizeof(struct sctp_chunk); + WARN_ON(refcount_sub_and_test(sizeof(struct sctp_chunk), + &sk->sk_wmem_alloc)); if (chunk->shkey) { struct sctp_shared_key *shkey = chunk->shkey; -- 2.45.2