[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <154aa989b7a97aebaffd96ff6773b416b79398be.1520253539.git.lucien.xin@gmail.com>
Date: Mon, 5 Mar 2018 20:44:18 +0800
From: Xin Long <lucien.xin@...il.com>
To: network dev <netdev@...r.kernel.org>, linux-sctp@...r.kernel.org
Cc: Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
Neil Horman <nhorman@...driver.com>, davem@...emloft.net
Subject: [PATCH net-next 1/3] 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@...il.com>
---
include/net/sctp/structs.h | 1 +
include/uapi/linux/sctp.h | 15 +++++++++++++++
net/sctp/socket.c | 31 ++++++++++++++++++++++++++++++-
3 files changed, 46 insertions(+), 1 deletion(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index 03e92dd..d40a2a3 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -2112,6 +2112,7 @@ struct sctp_cmsgs {
struct sctp_initmsg *init;
struct sctp_sndrcvinfo *srinfo;
struct sctp_sndinfo *sinfo;
+ struct sctp_prinfo *prinfo;
};
/* Structure for tracking memory objects */
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 4c4db14..0dd1f82 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -260,6 +260,19 @@ struct sctp_nxtinfo {
sctp_assoc_t nxt_assoc_id;
};
+/* 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
+ */
+struct sctp_prinfo {
+ __u16 pr_policy;
+ __u32 pr_value;
+};
+
/*
* sinfo_flags: 16 bits (unsigned integer)
*
@@ -293,6 +306,8 @@ typedef enum sctp_cmsg_type {
#define SCTP_RCVINFO SCTP_RCVINFO
SCTP_NXTINFO, /* 5.3.6 SCTP Next Receive Information Structure */
#define SCTP_NXTINFO SCTP_NXTINFO
+ SCTP_PRINFO, /* 5.3.7 SCTP PR-SCTP Information Structure */
+#define SCTP_PRINFO SCTP_PRINFO
} sctp_cmsg_t;
/*
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 7fa7603..fdde697 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;
}
--
2.1.0
Powered by blists - more mailing lists