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| author | Marcelo Ricardo Leitner <marcelo.leitner@gmail.com> | 2018-04-26 16:58:54 -0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-04-27 14:35:23 -0400 |
| commit | feddd6c1af30ab11d73ce0e4e76b40dfc899dbda (patch) | |
| tree | 5103795b3aed0972f3be763097c9b9c11efda77f /net/sctp | |
| parent | c4b2893dae6427ce1e528033383c94cbf81e80d8 (diff) | |
| download | linux-feddd6c1af30ab11d73ce0e4e76b40dfc899dbda.tar.gz linux-feddd6c1af30ab11d73ce0e4e76b40dfc899dbda.tar.bz2 linux-feddd6c1af30ab11d73ce0e4e76b40dfc899dbda.zip | |
sctp: introduce sctp_mtu_payload
When given a MTU, this function calculates how much payload we can carry
on it. Without a MTU, it calculates the amount of header overhead we
have.
So that when we have extra overhead, like the one added for IP options
on SELinux patches, it is easier to handle it.
Signed-off-by: Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sctp')
| -rw-r--r-- | net/sctp/output.c | 25 | ||||
| -rw-r--r-- | net/sctp/socket.c | 7 |
2 files changed, 12 insertions, 20 deletions
diff --git a/net/sctp/output.c b/net/sctp/output.c index 690d8557bb7b..bf4226c3cc1d 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -90,8 +90,8 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag, { struct sctp_transport *tp = packet->transport; struct sctp_association *asoc = tp->asoc; + struct sctp_sock *sp = NULL; struct sock *sk; - size_t overhead = sizeof(struct ipv6hdr) + sizeof(struct sctphdr); pr_debug("%s: packet:%p vtag:0x%x\n", __func__, packet, vtag); packet->vtag = vtag; @@ -102,25 +102,20 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag, /* set packet max_size with pathmtu, then calculate overhead */ packet->max_size = tp->pathmtu; + if (asoc) { - struct sctp_sock *sp = sctp_sk(asoc->base.sk); - struct sctp_af *af = sp->pf->af; - - overhead = af->net_header_len + - af->ip_options_len(asoc->base.sk); - overhead += sizeof(struct sctphdr); - packet->overhead = overhead; - packet->size = overhead; - } else { - packet->overhead = overhead; - packet->size = overhead; - return; + sk = asoc->base.sk; + sp = sctp_sk(sk); } + packet->overhead = sctp_mtu_payload(sp, 0, 0); + packet->size = packet->overhead; + + if (!asoc) + return; /* update dst or transport pathmtu if in need */ - sk = asoc->base.sk; if (!sctp_transport_dst_check(tp)) { - sctp_transport_route(tp, NULL, sctp_sk(sk)); + sctp_transport_route(tp, NULL, sp); if (asoc->param_flags & SPP_PMTUD_ENABLE) sctp_assoc_sync_pmtu(asoc); } else if (!sctp_transport_pmtu_check(tp)) { diff --git a/net/sctp/socket.c b/net/sctp/socket.c index eeec81d5c485..b9d14f57146b 100644 --- a/net/sctp/socket.c +++ b/net/sctp/socket.c @@ -3234,11 +3234,8 @@ static int sctp_setsockopt_maxseg(struct sock *sk, char __user *optval, unsigned if (val) { int min_len, max_len; - min_len = SCTP_DEFAULT_MINSEGMENT - af->net_header_len; - min_len -= af->ip_options_len(sk); - min_len -= sizeof(struct sctphdr) + - sizeof(struct sctp_data_chunk); - + min_len = sctp_mtu_payload(sp, SCTP_DEFAULT_MINSEGMENT, + sizeof(struct sctp_data_chunk)); max_len = SCTP_MAX_CHUNK_LEN - sizeof(struct sctp_data_chunk); if (val < min_len || val > max_len) |