From b7e10c25b839c0c7579b2b402afc9883c107e09f Mon Sep 17 00:00:00 2001 From: Richard Haines Date: Sat, 24 Feb 2018 16:18:51 +0000 Subject: sctp: Add ip option support Add ip option support to allow LSM security modules to utilise CIPSO/IPv4 and CALIPSO/IPv6 services. Signed-off-by: Richard Haines Acked-by: Neil Horman Acked-by: Marcelo Ricardo Leitner Signed-off-by: Paul Moore --- net/sctp/output.c | 34 +++++++++++++++++++++------------- 1 file changed, 21 insertions(+), 13 deletions(-) (limited to 'net/sctp/output.c') diff --git a/net/sctp/output.c b/net/sctp/output.c index 01a26ee051e3..a58d13c2d443 100644 --- a/net/sctp/output.c +++ b/net/sctp/output.c @@ -69,7 +69,11 @@ static enum sctp_xmit sctp_packet_will_fit(struct sctp_packet *packet, static void sctp_packet_reset(struct sctp_packet *packet) { + /* sctp_packet_transmit() relies on this to reset size to the + * current overhead after sending packets. + */ packet->size = packet->overhead; + packet->has_cookie_echo = 0; packet->has_sack = 0; packet->has_data = 0; @@ -87,6 +91,7 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag, struct sctp_transport *tp = packet->transport; struct sctp_association *asoc = tp->asoc; 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; @@ -95,10 +100,22 @@ void sctp_packet_config(struct sctp_packet *packet, __u32 vtag, if (!sctp_packet_empty(packet)) return; - /* set packet max_size with pathmtu */ + /* set packet max_size with pathmtu, then calculate overhead */ packet->max_size = tp->pathmtu; - if (!asoc) + 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; + } /* update dst or transport pathmtu if in need */ sk = asoc->base.sk; @@ -140,23 +157,14 @@ void sctp_packet_init(struct sctp_packet *packet, struct sctp_transport *transport, __u16 sport, __u16 dport) { - struct sctp_association *asoc = transport->asoc; - size_t overhead; - pr_debug("%s: packet:%p transport:%p\n", __func__, packet, transport); packet->transport = transport; packet->source_port = sport; packet->destination_port = dport; INIT_LIST_HEAD(&packet->chunk_list); - if (asoc) { - struct sctp_sock *sp = sctp_sk(asoc->base.sk); - overhead = sp->pf->af->net_header_len; - } else { - overhead = sizeof(struct ipv6hdr); - } - overhead += sizeof(struct sctphdr); - packet->overhead = overhead; + /* The overhead will be calculated by sctp_packet_config() */ + packet->overhead = 0; sctp_packet_reset(packet); packet->vtag = 0; } -- cgit v1.2.3