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authorXin Long <lucien.xin@gmail.com>2018-03-05 20:44:18 +0800
committerDavid S. Miller <davem@davemloft.net>2018-03-07 10:55:29 -0500
commited63afb8a318f6b3558d76afba7809daee4f28e5 (patch)
tree15f0e055a67fa53ab73711c95b25c2483bcca5a3 /net/sctp
parent5c3d0fd4b2c047cedb1cbdad6e2d6bc9abfec256 (diff)
downloadlinux-ed63afb8a318f6b3558d76afba7809daee4f28e5.tar.bz2
sctp: add support for PR-SCTP Information for sendmsg
This patch is to add support for PR-SCTP Information for sendmsg, as described in section 5.3.7 of RFC6458. With this option, you can specify pr_policy and pr_value for user data in sendmsg. It's also a necessary send info for sctp_sendv. 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/socket.c31
1 files changed, 30 insertions, 1 deletions
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7fa76031bb08..fdde697b37e7 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1644,6 +1644,12 @@ static int sctp_sendmsg_parse(struct sock *sk, struct sctp_cmsgs *cmsgs,
srinfo->sinfo_assoc_id = cmsgs->sinfo->snd_assoc_id;
}
+ if (cmsgs->prinfo) {
+ srinfo->sinfo_timetolive = cmsgs->prinfo->pr_value;
+ SCTP_PR_SET_POLICY(srinfo->sinfo_flags,
+ cmsgs->prinfo->pr_policy);
+ }
+
sflags = srinfo->sinfo_flags;
if (!sflags && msg_len)
return 0;
@@ -1901,9 +1907,12 @@ static void sctp_sendmsg_update_sinfo(struct sctp_association *asoc,
sinfo->sinfo_ppid = asoc->default_ppid;
sinfo->sinfo_context = asoc->default_context;
sinfo->sinfo_assoc_id = sctp_assoc2id(asoc);
+
+ if (!cmsgs->prinfo)
+ sinfo->sinfo_flags = asoc->default_flags;
}
- if (!cmsgs->srinfo)
+ if (!cmsgs->srinfo && !cmsgs->prinfo)
sinfo->sinfo_timetolive = asoc->default_timetolive;
}
@@ -7749,6 +7758,26 @@ static int sctp_msghdr_parse(const struct msghdr *msg, struct sctp_cmsgs *cmsgs)
SCTP_ABORT | SCTP_EOF))
return -EINVAL;
break;
+ case SCTP_PRINFO:
+ /* SCTP Socket API Extension
+ * 5.3.7 SCTP PR-SCTP Information Structure (SCTP_PRINFO)
+ *
+ * This cmsghdr structure specifies SCTP options for sendmsg().
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ ---------------------
+ * IPPROTO_SCTP SCTP_PRINFO struct sctp_prinfo
+ */
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_prinfo)))
+ return -EINVAL;
+
+ cmsgs->prinfo = CMSG_DATA(cmsg);
+ if (cmsgs->prinfo->pr_policy & ~SCTP_PR_SCTP_MASK)
+ return -EINVAL;
+
+ if (cmsgs->prinfo->pr_policy == SCTP_PR_SCTP_NONE)
+ cmsgs->prinfo->pr_value = 0;
+ break;
default:
return -EINVAL;
}