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authorXin Long <lucien.xin@gmail.com>2018-03-14 19:05:31 +0800
committerDavid S. Miller <davem@davemloft.net>2018-03-14 13:48:27 -0400
commit3ff547c06a7d75d72d37dae2c064fcf0672e56c0 (patch)
tree72a2dd1b695f52b90af548e00097177fd5b8da41 /net/sctp/chunk.c
parent1b1e0bc9947427ae58bbe7de0ce9cfd591b589b9 (diff)
sctp: add support for SCTP AUTH Information for sendmsg
This patch is to add support for SCTP AUTH Information for sendmsg, as described in section 5.3.8 of RFC6458. With this option, you can provide shared key identifier used for sending the user message. It's also a necessary send info for sctp_sendv. Note that it reuses sinfo->sinfo_tsn to indicate if this option is set and sinfo->sinfo_ssn to save the shkey ID which can be 0. 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>
Diffstat (limited to 'net/sctp/chunk.c')
-rw-r--r--net/sctp/chunk.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 9f28a9aae976..f889a84f264d 100644
--- a/net/sctp/chunk.c
+++ b/net/sctp/chunk.c
@@ -206,7 +206,16 @@ struct sctp_datamsg *sctp_datamsg_from_user(struct sctp_association *asoc,
max_data -= SCTP_PAD4(sizeof(struct sctp_auth_chunk) +
hmac_desc->hmac_len);
- shkey = asoc->shkey;
+ if (sinfo->sinfo_tsn &&
+ sinfo->sinfo_ssn != asoc->active_key_id) {
+ shkey = sctp_auth_get_shkey(asoc, sinfo->sinfo_ssn);
+ if (!shkey) {
+ err = -EINVAL;
+ goto errout;
+ }
+ } else {
+ shkey = asoc->shkey;
+ }
}
/* Check what's our max considering the above */