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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
parent1b1e0bc9947427ae58bbe7de0ce9cfd591b589b9 (diff)
downloadop-kernel-dev-3ff547c06a7d75d72d37dae2c064fcf0672e56c0.zip
op-kernel-dev-3ff547c06a7d75d72d37dae2c064fcf0672e56c0.tar.gz
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')
-rw-r--r--net/sctp/chunk.c11
-rw-r--r--net/sctp/socket.c23
2 files changed, 33 insertions, 1 deletions
diff --git a/net/sctp/chunk.c b/net/sctp/chunk.c
index 9f28a9a..f889a84 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 */
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 003a4ad..9ffdecb 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1987,6 +1987,14 @@ static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
if (!cmsgs->srinfo && !cmsgs->prinfo)
sinfo->sinfo_timetolive = asoc->default_timetolive;
+
+ if (cmsgs->authinfo) {
+ /* Reuse sinfo_tsn to indicate that authinfo was set and
+ * sinfo_ssn to save the keyid on tx path.
+ */
+ sinfo->sinfo_tsn = 1;
+ sinfo->sinfo_ssn = cmsgs->authinfo->auth_keynumber;
+ }
}
static int sctp_sendmsg(struct sock *sk, struct msghdr *msg, size_t msg_len)
@@ -7874,6 +7882,21 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
cmsgs->prinfo->pr_value = 0;
break;
+ case SCTP_AUTHINFO:
+ /* SCTP Socket API Extension
+ * 5.3.8 SCTP AUTH Information Structure (SCTP_AUTHINFO)
+ *
+ * This cmsghdr structure specifies SCTP options for sendmsg().
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ ---------------------
+ * IPPROTO_SCTP SCTP_AUTHINFO struct sctp_authinfo
+ */
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_authinfo)))
+ return -EINVAL;
+
+ cmsgs->authinfo = CMSG_DATA(cmsg);
+ break;
case SCTP_DSTADDRV4:
case SCTP_DSTADDRV6:
/* SCTP Socket API Extension
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