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Date: Fri, 4 Jul 2014 23:05:05 +0200
From: Daniel Borkmann <dborkman@...hat.com>
To: davem@...emloft.net
Cc: geirola@...il.com, netdev@...r.kernel.org,
linux-sctp@...r.kernel.org
Subject: [PATCH net-next 2/5] net: sctp: implement rfc6458, 5.3.4. SCTP_SNDINFO cmsg support
From: Geir Ola Vaagland <geirola@...il.com>
This patch implements section 5.3.4. of RFC6458, that is, support
for 'SCTP Send Information Structure' (SCTP_SNDINFO) which can be
placed into ancillary data cmsghdr structure for sendmsg() calls.
The sctp_sndinfo structure is defined as per RFC as below ...
struct sctp_sndinfo {
uint16_t snd_sid;
uint16_t snd_flags;
uint32_t snd_ppid;
uint32_t snd_context;
sctp_assoc_t snd_assoc_id;
};
... and supplied under cmsg_level IPPROTO_SCTP, cmsg_type
SCTP_SNDINFO, while cmsg_data[] contains struct sctp_sndinfo.
An sctp_sndinfo item always corresponds to the data in msg_iov.
Joint work with Daniel Borkmann.
Signed-off-by: Geir Ola Vaagland <geirola@...il.com>
Signed-off-by: Daniel Borkmann <dborkman@...hat.com>
---
include/net/sctp/structs.h | 3 +-
include/uapi/linux/sctp.h | 22 +++++++++++--
net/sctp/socket.c | 77 ++++++++++++++++++++++++++++++++++------------
3 files changed, 79 insertions(+), 23 deletions(-)
diff --git a/include/net/sctp/structs.h b/include/net/sctp/structs.h
index f38588b..7af9a0f 100644
--- a/include/net/sctp/structs.h
+++ b/include/net/sctp/structs.h
@@ -1919,7 +1919,8 @@ struct sctp_chunk *sctp_get_ecne_prepend(struct sctp_association *asoc);
/* A convenience structure to parse out SCTP specific CMSGs. */
typedef struct sctp_cmsgs {
struct sctp_initmsg *init;
- struct sctp_sndrcvinfo *info;
+ struct sctp_sndrcvinfo *srinfo;
+ struct sctp_sndinfo *sinfo;
} sctp_cmsgs_t;
/* Structure for tracking memory objects */
diff --git a/include/uapi/linux/sctp.h b/include/uapi/linux/sctp.h
index 266022a..a387761 100644
--- a/include/uapi/linux/sctp.h
+++ b/include/uapi/linux/sctp.h
@@ -154,6 +154,22 @@ struct sctp_sndrcvinfo {
sctp_assoc_t sinfo_assoc_id;
};
+/* 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
+ *
+ * This cmsghdr structure specifies SCTP options for sendmsg().
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ -------------------
+ * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
+ */
+struct sctp_sndinfo {
+ __u16 snd_sid;
+ __u16 snd_flags;
+ __u32 snd_ppid;
+ __u32 snd_context;
+ sctp_assoc_t snd_assoc_id;
+};
+
/*
* sinfo_flags: 16 bits (unsigned integer)
*
@@ -177,10 +193,12 @@ typedef union {
/* These are cmsg_types. */
typedef enum sctp_cmsg_type {
- SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */
+ SCTP_INIT, /* 5.2.1 SCTP Initiation Structure */
#define SCTP_INIT SCTP_INIT
- SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */
+ SCTP_SNDRCV, /* 5.2.2 SCTP Header Information Structure */
#define SCTP_SNDRCV SCTP_SNDRCV
+ SCTP_SNDINFO, /* 5.3.4 SCTP Send Information Structure */
+#define SCTP_SNDINFO SCTP_SNDINFO
} sctp_cmsg_t;
/*
diff --git a/net/sctp/socket.c b/net/sctp/socket.c
index 4298996..d61729e 100644
--- a/net/sctp/socket.c
+++ b/net/sctp/socket.c
@@ -1602,12 +1602,13 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
struct sctp_initmsg *sinit;
sctp_assoc_t associd = 0;
sctp_cmsgs_t cmsgs = { NULL };
- int err;
sctp_scope_t scope;
- long timeo;
- __u16 sinfo_flags = 0;
+ bool fill_sinfo_ttl = false;
struct sctp_datamsg *datamsg;
int msg_flags = msg->msg_flags;
+ __u16 sinfo_flags = 0;
+ long timeo;
+ int err;
err = 0;
sp = sctp_sk(sk);
@@ -1648,10 +1649,21 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
msg_name = msg->msg_name;
}
- sinfo = cmsgs.info;
sinit = cmsgs.init;
+ if (cmsgs.sinfo != NULL) {
+ memset(&default_sinfo, 0, sizeof(default_sinfo));
+ default_sinfo.sinfo_stream = cmsgs.sinfo->snd_sid;
+ default_sinfo.sinfo_flags = cmsgs.sinfo->snd_flags;
+ default_sinfo.sinfo_ppid = cmsgs.sinfo->snd_ppid;
+ default_sinfo.sinfo_context = cmsgs.sinfo->snd_context;
+ default_sinfo.sinfo_assoc_id = cmsgs.sinfo->snd_assoc_id;
- /* Did the user specify SNDRCVINFO? */
+ sinfo = &default_sinfo;
+ fill_sinfo_ttl = true;
+ } else {
+ sinfo = cmsgs.srinfo;
+ }
+ /* Did the user specify SNDINFO/SNDRCVINFO? */
if (sinfo) {
sinfo_flags = sinfo->sinfo_flags;
associd = sinfo->sinfo_assoc_id;
@@ -1858,8 +1870,8 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
pr_debug("%s: we have a valid association\n", __func__);
if (!sinfo) {
- /* If the user didn't specify SNDRCVINFO, make up one with
- * some defaults.
+ /* If the user didn't specify SNDINFO/SNDRCVINFO, make up
+ * one with some defaults.
*/
memset(&default_sinfo, 0, sizeof(default_sinfo));
default_sinfo.sinfo_stream = asoc->default_stream;
@@ -1868,7 +1880,13 @@ static int sctp_sendmsg(struct kiocb *iocb, struct sock *sk,
default_sinfo.sinfo_context = asoc->default_context;
default_sinfo.sinfo_timetolive = asoc->default_timetolive;
default_sinfo.sinfo_assoc_id = sctp_assoc2id(asoc);
+
sinfo = &default_sinfo;
+ } else if (fill_sinfo_ttl) {
+ /* In case SNDINFO was specified, we still need to fill
+ * it with a default ttl from the assoc here.
+ */
+ sinfo->sinfo_timetolive = asoc->default_timetolive;
}
/* API 7.1.7, the sndbuf size per association bounds the
@@ -6390,8 +6408,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
struct cmsghdr *cmsg;
struct msghdr *my_msg = (struct msghdr *)msg;
- for (cmsg = CMSG_FIRSTHDR(msg);
- cmsg != NULL;
+ for (cmsg = CMSG_FIRSTHDR(msg); cmsg != NULL;
cmsg = CMSG_NXTHDR(my_msg, cmsg)) {
if (!CMSG_OK(my_msg, cmsg))
return -EINVAL;
@@ -6404,7 +6421,7 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
switch (cmsg->cmsg_type) {
case SCTP_INIT:
/* SCTP Socket API Extension
- * 5.2.1 SCTP Initiation Structure (SCTP_INIT)
+ * 5.3.1 SCTP Initiation Structure (SCTP_INIT)
*
* This cmsghdr structure provides information for
* initializing new SCTP associations with sendmsg().
@@ -6416,15 +6433,15 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
* ------------ ------------ ----------------------
* IPPROTO_SCTP SCTP_INIT struct sctp_initmsg
*/
- if (cmsg->cmsg_len !=
- CMSG_LEN(sizeof(struct sctp_initmsg)))
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_initmsg)))
return -EINVAL;
- cmsgs->init = (struct sctp_initmsg *)CMSG_DATA(cmsg);
+
+ cmsgs->init = CMSG_DATA(cmsg);
break;
case SCTP_SNDRCV:
/* SCTP Socket API Extension
- * 5.2.2 SCTP Header Information Structure(SCTP_SNDRCV)
+ * 5.3.2 SCTP Header Information Structure(SCTP_SNDRCV)
*
* This cmsghdr structure specifies SCTP options for
* sendmsg() and describes SCTP header information
@@ -6434,24 +6451,44 @@ static int sctp_msghdr_parse(const struct msghdr *msg, sctp_cmsgs_t *cmsgs)
* ------------ ------------ ----------------------
* IPPROTO_SCTP SCTP_SNDRCV struct sctp_sndrcvinfo
*/
- if (cmsg->cmsg_len !=
- CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndrcvinfo)))
return -EINVAL;
- cmsgs->info =
- (struct sctp_sndrcvinfo *)CMSG_DATA(cmsg);
+ cmsgs->srinfo = CMSG_DATA(cmsg);
- /* Minimally, validate the sinfo_flags. */
- if (cmsgs->info->sinfo_flags &
+ if (cmsgs->srinfo->sinfo_flags &
~(SCTP_UNORDERED | SCTP_ADDR_OVER |
SCTP_ABORT | SCTP_EOF))
return -EINVAL;
break;
+ case SCTP_SNDINFO:
+ /* SCTP Socket API Extension
+ * 5.3.4 SCTP Send Information Structure (SCTP_SNDINFO)
+ *
+ * This cmsghdr structure specifies SCTP options for
+ * sendmsg(). This structure and SCTP_RCVINFO replaces
+ * SCTP_SNDRCV which has been deprecated.
+ *
+ * cmsg_level cmsg_type cmsg_data[]
+ * ------------ ------------ ---------------------
+ * IPPROTO_SCTP SCTP_SNDINFO struct sctp_sndinfo
+ */
+ if (cmsg->cmsg_len != CMSG_LEN(sizeof(struct sctp_sndinfo)))
+ return -EINVAL;
+
+ cmsgs->sinfo = CMSG_DATA(cmsg);
+
+ if (cmsgs->sinfo->snd_flags &
+ ~(SCTP_UNORDERED | SCTP_ADDR_OVER |
+ SCTP_ABORT | SCTP_EOF))
+ return -EINVAL;
+ break;
default:
return -EINVAL;
}
}
+
return 0;
}
--
1.7.11.7
--
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