[PATCH iproute2 0/5] Teach ss to show sockets' shutdown state

STALE5107d

12 messages, 3 authors, 2012-10-27 · open the first message on its own page

[PATCH iproute2 0/5] Teach ss to show sockets' shutdown state

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:16:34

In the net-next sits a patch which extends the sock-diag subsys to 
show the sockets' shutdown state. I propose to teach the ss tool to 
print this info when requested with -e|--extended key.

The output will look like arrows at the end of each line, like this:

ESTAB 0 0  127.0.0.1:41705  127.0.0.1:12345  ino:143321 sk:ffff88003a8cea00 -->
ESTAB 0 0  127.0.0.1:46925  127.0.0.1:12346  ino:143322 sk:ffff88003a8ce4c0 <--
ESTAB 0 0  127.0.0.1:51678  127.0.0.1:12347  ino:143323 sk:ffff88003a8cdf80 ---
ESTAB 0 0  127.0.0.1:46911  127.0.0.1:12348  ino:143324 sk:ffff88003b7f05c0 <->

for SHUT_RD, SHUT_WR, SHUT_RDWR and non-shutdown sockets respectively.


In order to do so, it's also required to implement support for the
newer sock-diag in tcp and udp netlink code. I did it before, but
broke compatibility with older kernels (those without sock-diag).
Now this is fixed (checked on 2.6.40 kernel).

Signed-off-by: Pavel Emelyanov <redacted>

[PATCH 1/5] ss: Rename some tcp- names into inet-

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:18:33

The sock-diag is capable to diag udp sockets as well. Prepare the
ss code for this by first renaming soon-to-be-generic tcp-s names
into inet-s.

Signed-off-by: Pavel Emelyanov <redacted>
---
 misc/ss.c |   21 ++++++++++++---------
 1 files changed, 12 insertions(+), 9 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index d00d3e7..3bceedf 100644
--- a/misc/ss.c
+++ b/misc/ss.c

@@ -1431,7 +1431,7 @@ static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r)
 	}
 }
 
-static int tcp_show_sock(struct nlmsghdr *nlh, struct filter *f)
+static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f)
 {
 	struct inet_diag_msg *r = NLMSG_DATA(nlh);
 	struct tcpstat s;

@@ -1495,7 +1495,7 @@ static int tcp_show_sock(struct nlmsghdr *nlh, struct filter *f)
 	return 0;
 }
 
-static int tcp_show_netlink(struct filter *f, FILE *dump_fp, int socktype)
+static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 {
 	int fd;
 	struct sockaddr_nl nladdr;

@@ -1517,7 +1517,10 @@ static int tcp_show_netlink(struct filter *f, FILE *dump_fp, int socktype)
 	nladdr.nl_family = AF_NETLINK;
 
 	req.nlh.nlmsg_len = sizeof(req);
-	req.nlh.nlmsg_type = socktype;
+	if (protocol == IPPROTO_TCP)
+		req.nlh.nlmsg_type = TCPDIAG_GETSOCK;
+	else
+		req.nlh.nlmsg_type = DCCPDIAG_GETSOCK;
 	req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
 	req.nlh.nlmsg_pid = 0;
 	req.nlh.nlmsg_seq = 123456;

@@ -1626,7 +1629,7 @@ static int tcp_show_netlink(struct filter *f, FILE *dump_fp, int socktype)
 					h = NLMSG_NEXT(h, status);
 					continue;
 				}
-				err = tcp_show_sock(h, NULL);
+				err = inet_show_sock(h, NULL);
 				if (err < 0) {
 					close(fd);
 					return err;

@@ -1699,7 +1702,7 @@ static int tcp_show_netlink_file(struct filter *f)
 			return -1;
 		}
 
-		err = tcp_show_sock(h, f);
+		err = inet_show_sock(h, f);
 		if (err < 0)
 			return err;
 	}

@@ -1717,7 +1720,7 @@ static int tcp_show(struct filter *f, int socktype)
 		return tcp_show_netlink_file(f);
 
 	if (!getenv("PROC_NET_TCP") && !getenv("PROC_ROOT")
-	    && tcp_show_netlink(f, NULL, socktype) == 0)
+	    && inet_show_netlink(f, NULL, socktype) == 0)
 		return 0;
 
 	/* Sigh... We have to parse /proc/net/tcp... */

@@ -2980,7 +2983,7 @@ int main(int argc, char *argv[])
 				exit(-1);
 			}
 		}
-		tcp_show_netlink(&current_filter, dump_fp, TCPDIAG_GETSOCK);
+		inet_show_netlink(&current_filter, dump_fp, IPPROTO_TCP);
 		fflush(dump_fp);
 		exit(0);
 	}

@@ -3048,8 +3051,8 @@ int main(int argc, char *argv[])
 	if (current_filter.dbs & (1<<UDP_DB))
 		udp_show(&current_filter);
 	if (current_filter.dbs & (1<<TCP_DB))
-		tcp_show(&current_filter, TCPDIAG_GETSOCK);
+		tcp_show(&current_filter, IPPROTO_TCP);
 	if (current_filter.dbs & (1<<DCCP_DB))
-		tcp_show(&current_filter, DCCPDIAG_GETSOCK);
+		tcp_show(&current_filter, IPPROTO_DCCP);
 	return 0;
 }

-- 
1.7.1

[PATCH 2/5] ss: Split inet_show_netlink into parts

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:21:43

The existing function inet_show_netlink sends tcp-diag request and
then receives back the response and prints it on the screen.

The sock-diag and legacy tcp-diag have different request types, but
report sockets in the same format. In order to support both it's
convenient to split the code into sending and receiving parts.

Signed-off-by: Pavel Emelyanov <redacted>
---
 misc/ss.c |   27 +++++++++++++++++++++------
 1 files changed, 21 insertions(+), 6 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index 3bceedf..27feeb8 100644
--- a/misc/ss.c
+++ b/misc/ss.c

@@ -1495,9 +1495,8 @@ static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f)
 	return 0;
 }
 
-static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
+static int tcpdiag_send(int fd, int protocol, struct filter *f)
 {
-	int fd;
 	struct sockaddr_nl nladdr;
 	struct {
 		struct nlmsghdr nlh;

@@ -1507,12 +1506,8 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 	int	bclen;
 	struct msghdr msg;
 	struct rtattr rta;
-	char	buf[8192];
 	struct iovec iov[3];
 
-	if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG)) < 0)
-		return -1;
-
 	memset(&nladdr, 0, sizeof(nladdr));
 	nladdr.nl_family = AF_NETLINK;

@@ -1563,6 +1558,26 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 		return -1;
 	}
 
+	return 0;
+}
+
+static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
+{
+	int fd;
+	struct sockaddr_nl nladdr;
+	struct msghdr msg;
+	char	buf[8192];
+	struct iovec iov[3];
+
+	if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG)) < 0)
+		return -1;
+
+	if (tcpdiag_send(fd, protocol, f))
+		return -1;
+
+	memset(&nladdr, 0, sizeof(nladdr));
+	nladdr.nl_family = AF_NETLINK;
+
 	iov[0] = (struct iovec){
 		.iov_base = buf,
 		.iov_len = sizeof(buf)

-- 
1.7.1

[PATCH 3/5] ss: Support sock-diag

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:23:37

That is -- write the code, that sends diag request in new format. It's
mostly copied from tcp-diag code. Plus, sock-diag differentiates sockets
by families, thus we have to send two requests sequentially.

If we fail to submit new sock-diag request, try to fall-back and submit
the legacy tcp-diag one.

Signed-off-by: Pavel Emelyanov <redacted>

---
 misc/ss.c |   95 +++++++++++++++++++++++++++++++++++++++++++++++++++++++-----
 1 files changed, 87 insertions(+), 8 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index 27feeb8..1ceb026 100644
--- a/misc/ss.c
+++ b/misc/ss.c

@@ -1561,9 +1561,76 @@ static int tcpdiag_send(int fd, int protocol, struct filter *f)
 	return 0;
 }
 
+static int sockdiag_send(int family, int fd, int protocol, struct filter *f)
+{
+	struct sockaddr_nl nladdr;
+	struct {
+		struct nlmsghdr nlh;
+		struct inet_diag_req_v2 r;
+	} req;
+	char    *bc = NULL;
+	int	bclen;
+	struct msghdr msg;
+	struct rtattr rta;
+	struct iovec iov[3];
+
+	if (family == PF_UNSPEC)
+		return tcpdiag_send(fd, protocol, f);
+
+	memset(&nladdr, 0, sizeof(nladdr));
+	nladdr.nl_family = AF_NETLINK;
+
+	req.nlh.nlmsg_len = sizeof(req);
+	req.nlh.nlmsg_type = SOCK_DIAG_BY_FAMILY;
+	req.nlh.nlmsg_flags = NLM_F_ROOT|NLM_F_MATCH|NLM_F_REQUEST;
+	req.nlh.nlmsg_pid = 0;
+	req.nlh.nlmsg_seq = 123456;
+	memset(&req.r, 0, sizeof(req.r));
+	req.r.sdiag_family = family;
+	req.r.sdiag_protocol = protocol;
+	req.r.idiag_states = f->states;
+	if (show_mem) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_MEMINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_SKMEMINFO-1));
+	}
+
+	if (show_tcpinfo) {
+		req.r.idiag_ext |= (1<<(INET_DIAG_INFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_VEGASINFO-1));
+		req.r.idiag_ext |= (1<<(INET_DIAG_CONG-1));
+	}
+
+	iov[0] = (struct iovec){
+		.iov_base = &req,
+		.iov_len = sizeof(req)
+	};
+	if (f->f) {
+		bclen = ssfilter_bytecompile(f->f, &bc);
+		rta.rta_type = INET_DIAG_REQ_BYTECODE;
+		rta.rta_len = RTA_LENGTH(bclen);
+		iov[1] = (struct iovec){ &rta, sizeof(rta) };
+		iov[2] = (struct iovec){ bc, bclen };
+		req.nlh.nlmsg_len += RTA_LENGTH(bclen);
+	}
+
+	msg = (struct msghdr) {
+		.msg_name = (void*)&nladdr,
+		.msg_namelen = sizeof(nladdr),
+		.msg_iov = iov,
+		.msg_iovlen = f->f ? 3 : 1,
+	};
+
+	if (sendmsg(fd, &msg, 0) < 0) {
+		close(fd);
+		return -1;
+	}
+
+	return 0;
+}
+
 static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 {
-	int fd;
+	int fd, family;
 	struct sockaddr_nl nladdr;
 	struct msghdr msg;
 	char	buf[8192];

@@ -1572,7 +1639,9 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 	if ((fd = socket(AF_NETLINK, SOCK_RAW, NETLINK_INET_DIAG)) < 0)
 		return -1;
 
-	if (tcpdiag_send(fd, protocol, f))
+	family = PF_INET;
+again:
+	if (sockdiag_send(family, fd, protocol, f))
 		return -1;
 
 	memset(&nladdr, 0, sizeof(nladdr));

@@ -1620,15 +1689,19 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 			    h->nlmsg_seq != 123456)
 				goto skip_it;
 
-			if (h->nlmsg_type == NLMSG_DONE) {
-				close(fd);
-				return 0;
-			}
+			if (h->nlmsg_type == NLMSG_DONE)
+				goto done;
+
 			if (h->nlmsg_type == NLMSG_ERROR) {
 				struct nlmsgerr *err = (struct nlmsgerr*)NLMSG_DATA(h);
 				if (h->nlmsg_len < NLMSG_LENGTH(sizeof(struct nlmsgerr))) {
 					fprintf(stderr, "ERROR truncated\n");
 				} else {
+					if (family != PF_UNSPEC) {
+						family = PF_UNSPEC;
+						goto again;
+					}
+
 					errno = -err->error;
 					if (errno == EOPNOTSUPP) {
 						close(fd);

@@ -1636,8 +1709,8 @@ static int inet_show_netlink(struct filter *f, FILE *dump_fp, int protocol)
 					}
 					perror("TCPDIAG answers");
 				}
-				close(fd);
-				return 0;
+
+				goto done;
 			}
 			if (!dump_fp) {
 				if (!(f->families & (1<<r->idiag_family))) {

@@ -1663,6 +1736,12 @@ skip_it:
 			exit(1);
 		}
 	}
+done:
+	if (family == PF_INET) {
+		family = PF_INET6;
+		goto again;
+	}
+
 	close(fd);
 	return 0;
 }

-- 
1.7.1

[PATCH 4/5] ss: Get udp sockets info via sock-diag

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:24:59

Now everything is prepared for it, so the patch is straightforward.

Signed-off-by: Pavel Emelyanov <redacted>

---
 misc/ss.c |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/misc/ss.c b/misc/ss.c
index 1ceb026..a0ab2e9 100644
--- a/misc/ss.c
+++ b/misc/ss.c

@@ -1508,6 +1508,9 @@ static int tcpdiag_send(int fd, int protocol, struct filter *f)
 	struct rtattr rta;
 	struct iovec iov[3];
 
+	if (protocol == IPPROTO_UDP)
+		return -1;
+
 	memset(&nladdr, 0, sizeof(nladdr));
 	nladdr.nl_family = AF_NETLINK;

@@ -1976,6 +1979,10 @@ int udp_show(struct filter *f)
 {
 	FILE *fp = NULL;
 
+	if (!getenv("PROC_NET_UDP") && !getenv("PROC_ROOT")
+	    && inet_show_netlink(f, NULL, IPPROTO_UDP) == 0)
+		return 0;
+
 	dg_proto = UDP_PROTO;
 
 	if (f->families&(1<<AF_INET)) {

-- 
1.7.1

[PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Pavel Emelyanov <hidden>
Date: 2012-10-25 13:26:45

To see this we need kernel >=3.7 with _SHUTDOWN nlarrts in diag messages.
The output will look like arrows at the end of each line, like this:

ESTAB 0 0  127.0.0.1:41705  127.0.0.1:12345  ino:143321 sk:ffff88003a8cea00 -->
ESTAB 0 0  127.0.0.1:46925  127.0.0.1:12346  ino:143322 sk:ffff88003a8ce4c0 <--
ESTAB 0 0  127.0.0.1:51678  127.0.0.1:12347  ino:143323 sk:ffff88003a8cdf80 ---
ESTAB 0 0  127.0.0.1:46911  127.0.0.1:12348  ino:143324 sk:ffff88003b7f05c0 <->

for SHUT_RD, SHUT_WR, SHUT_RDWR and non-shutdown sockets respectively.

Signed-off-by: Pavel Emelyanov <redacted>

---
 include/linux/inet_diag.h |    3 ++-
 include/linux/unix_diag.h |    1 +
 misc/ss.c                 |   26 ++++++++++++++++++++------
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 8c469af..bbde90f 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h

@@ -109,9 +109,10 @@ enum {
 	INET_DIAG_TOS,
 	INET_DIAG_TCLASS,
 	INET_DIAG_SKMEMINFO,
+	INET_DIAG_SHUTDOWN,
 };
 
-#define INET_DIAG_MAX INET_DIAG_SKMEMINFO
+#define INET_DIAG_MAX INET_DIAG_SHUTDOWN
 
 
 /* INET_DIAG_MEM */

diff --git a/include/linux/unix_diag.h b/include/linux/unix_diag.h
index b1d2bf1..b8a2494 100644
--- a/include/linux/unix_diag.h
+++ b/include/linux/unix_diag.h

@@ -37,6 +37,7 @@ enum {
 	UNIX_DIAG_ICONS,
 	UNIX_DIAG_RQLEN,
 	UNIX_DIAG_MEMINFO,
+	UNIX_DIAG_SHUTDOWN,
 
 	UNIX_DIAG_MAX,
 };

diff --git a/misc/ss.c b/misc/ss.c
index a0ab2e9..0b70ee6 100644
--- a/misc/ss.c
+++ b/misc/ss.c

@@ -1327,15 +1327,12 @@ static char *sprint_bw(char *buf, double bw)
 	return buf;
 }
 
-static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r)
+static void tcp_show_info(const struct nlmsghdr *nlh, struct inet_diag_msg *r,
+		struct rtattr *tb[])
 {
-	struct rtattr * tb[INET_DIAG_MAX+1];
 	char b1[64];
 	double rtt = 0;
 
-	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr*)(r+1),
-		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
-
 	if (tb[INET_DIAG_SKMEMINFO]) {
 		const __u32 *skmeminfo = RTA_DATA(tb[INET_DIAG_SKMEMINFO]);

@@ -1435,6 +1432,10 @@ static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f)
 {
 	struct inet_diag_msg *r = NLMSG_DATA(nlh);
 	struct tcpstat s;
+	struct rtattr * tb[INET_DIAG_MAX+1];
+
+	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr*)(r+1),
+		     nlh->nlmsg_len - NLMSG_LENGTH(sizeof(*r)));
 
 	s.state = r->idiag_state;
 	s.local.family = s.remote.family = r->idiag_family;

@@ -1484,10 +1485,15 @@ static int inet_show_sock(struct nlmsghdr *nlh, struct filter *f)
 		if (r->id.idiag_cookie[1] != 0)
 			printf("%08x", r->id.idiag_cookie[1]);
  		printf("%08x", r->id.idiag_cookie[0]);
+		if (tb[INET_DIAG_SHUTDOWN]) {
+			unsigned char mask;
+			mask = *(__u8 *)RTA_DATA(tb[INET_DIAG_SHUTDOWN]);
+			printf(" %c-%c", mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+		}
 	}
 	if (show_mem || show_tcpinfo) {
 		printf("\n\t");
-		tcp_show_info(nlh, r);
+		tcp_show_info(nlh, r, tb);
 	}
 
 	printf("\n");

@@ -2184,6 +2190,14 @@ static int unix_show_sock(struct nlmsghdr *nlh, struct filter *f)
 			printf(" users:(%s)", ubuf);
 	}
 
+	if (show_details) {
+		if (tb[UNIX_DIAG_SHUTDOWN]) {
+			unsigned char mask;
+			mask = *(__u8 *)RTA_DATA(tb[UNIX_DIAG_SHUTDOWN]);
+			printf(" %c-%c", mask & 1 ? '-' : '<', mask & 2 ? '-' : '>');
+		}
+	}
+
 	printf("\n");
 
 	return 0;

-- 
1.7.1

Re: [PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Stephen Hemminger <hidden>
Date: 2012-10-25 15:53:18

On Thu, 25 Oct 2012 17:26:44 +0400
Pavel Emelyanov [off-list ref] wrote:

quoted hunk

To see this we need kernel >=3.7 with _SHUTDOWN nlarrts in diag messages.
The output will look like arrows at the end of each line, like this:

ESTAB 0 0  127.0.0.1:41705  127.0.0.1:12345  ino:143321 sk:ffff88003a8cea00 -->
ESTAB 0 0  127.0.0.1:46925  127.0.0.1:12346  ino:143322 sk:ffff88003a8ce4c0 <--
ESTAB 0 0  127.0.0.1:51678  127.0.0.1:12347  ino:143323 sk:ffff88003a8cdf80 ---
ESTAB 0 0  127.0.0.1:46911  127.0.0.1:12348  ino:143324 sk:ffff88003b7f05c0 <->

for SHUT_RD, SHUT_WR, SHUT_RDWR and non-shutdown sockets respectively.

Signed-off-by: Pavel Emelyanov <redacted>

---
 include/linux/inet_diag.h |    3 ++-
 include/linux/unix_diag.h |    1 +
 misc/ss.c                 |   26 ++++++++++++++++++++------
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 8c469af..bbde90f 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h

@@ -109,9 +109,10 @@ enum {
 	INET_DIAG_TOS,
 	INET_DIAG_TCLASS,
 	INET_DIAG_SKMEMINFO,
+	INET_DIAG_SHUTDOWN,
 };

Since this requires 3.8 or later kernel, please resubmit this
patch during that merge window.

Re: [PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Eric Dumazet <hidden>
Date: 2012-10-25 16:53:34

On Thu, 2012-10-25 at 08:52 -0700, Stephen Hemminger wrote:

On Thu, 25 Oct 2012 17:26:44 +0400
Pavel Emelyanov [off-list ref] wrote:

quoted

To see this we need kernel >=3.7 with _SHUTDOWN nlarrts in diag messages.
The output will look like arrows at the end of each line, like this:

ESTAB 0 0  127.0.0.1:41705  127.0.0.1:12345  ino:143321 sk:ffff88003a8cea00 -->
ESTAB 0 0  127.0.0.1:46925  127.0.0.1:12346  ino:143322 sk:ffff88003a8ce4c0 <--
ESTAB 0 0  127.0.0.1:51678  127.0.0.1:12347  ino:143323 sk:ffff88003a8cdf80 ---
ESTAB 0 0  127.0.0.1:46911  127.0.0.1:12348  ino:143324 sk:ffff88003b7f05c0 <->

for SHUT_RD, SHUT_WR, SHUT_RDWR and non-shutdown sockets respectively.

Signed-off-by: Pavel Emelyanov <redacted>

---
 include/linux/inet_diag.h |    3 ++-
 include/linux/unix_diag.h |    1 +
 misc/ss.c                 |   26 ++++++++++++++++++++------
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 8c469af..bbde90f 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h

@@ -109,9 +109,10 @@ enum {
 	INET_DIAG_TOS,
 	INET_DIAG_TCLASS,
 	INET_DIAG_SKMEMINFO,
+	INET_DIAG_SHUTDOWN,
 };

Since this requires 3.8 or later kernel, please resubmit this
patch during that merge window.
--

I am wondering what possibly could happen if applying this before ?

iproute2 should be non dependent on kernel version, we make sure to not
add regressions.

Re: [PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Stephen Hemminger <hidden>
Date: 2012-10-25 17:10:11

On Thu, 25 Oct 2012 18:53:30 +0200
Eric Dumazet [off-list ref] wrote:

On Thu, 2012-10-25 at 08:52 -0700, Stephen Hemminger wrote:

quoted

On Thu, 25 Oct 2012 17:26:44 +0400
Pavel Emelyanov [off-list ref] wrote:

quoted

To see this we need kernel >=3.7 with _SHUTDOWN nlarrts in diag messages.
The output will look like arrows at the end of each line, like this:

ESTAB 0 0  127.0.0.1:41705  127.0.0.1:12345  ino:143321 sk:ffff88003a8cea00 -->
ESTAB 0 0  127.0.0.1:46925  127.0.0.1:12346  ino:143322 sk:ffff88003a8ce4c0 <--
ESTAB 0 0  127.0.0.1:51678  127.0.0.1:12347  ino:143323 sk:ffff88003a8cdf80 ---
ESTAB 0 0  127.0.0.1:46911  127.0.0.1:12348  ino:143324 sk:ffff88003b7f05c0 <->

for SHUT_RD, SHUT_WR, SHUT_RDWR and non-shutdown sockets respectively.

Signed-off-by: Pavel Emelyanov <redacted>

---
 include/linux/inet_diag.h |    3 ++-
 include/linux/unix_diag.h |    1 +
 misc/ss.c                 |   26 ++++++++++++++++++++------
 3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/include/linux/inet_diag.h b/include/linux/inet_diag.h
index 8c469af..bbde90f 100644
--- a/include/linux/inet_diag.h
+++ b/include/linux/inet_diag.h

@@ -109,9 +109,10 @@ enum {
 	INET_DIAG_TOS,
 	INET_DIAG_TCLASS,
 	INET_DIAG_SKMEMINFO,
+	INET_DIAG_SHUTDOWN,
 };

Since this requires 3.8 or later kernel, please resubmit this
patch during that merge window.
--

I am wondering what possibly could happen if applying this before ?

iproute2 should be non dependent on kernel version, we make sure to not
add regressions.

I don't want the stashed kernel headers to get out of date with kernel exported ones.

People who want to test early features are free to build their own pre-release versions.

Re: [PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Eric Dumazet <hidden>
Date: 2012-10-25 18:00:57

On Thu, 2012-10-25 at 10:09 -0700, Stephen Hemminger wrote:

I don't want the stashed kernel headers to get out of date with kernel exported ones.

People who want to test early features are free to build their own pre-release versions.
--

Have you considered an iproute2-next tree, it would really help us a
lot.

Just to be clear, were the patches 1-4 accepted ?

(UDP diag was added kernel in December 2011)

Thanks

Re: [PATCH 5/5] ss: Show inet and unix sockets' shutdown state

From: Stephen Hemminger <hidden>
Date: 2012-10-25 23:02:14

On Thu, 25 Oct 2012 20:00:54 +0200
Eric Dumazet [off-list ref] wrote:

On Thu, 2012-10-25 at 10:09 -0700, Stephen Hemminger wrote:

quoted

I don't want the stashed kernel headers to get out of date with kernel exported ones.

People who want to test early features are free to build their own pre-release versions.
--

Have you considered an iproute2-next tree, it would really help us a
lot.

Just to be clear, were the patches 1-4 accepted ?

(UDP diag was added kernel in December 2011)

Thanks

The first 4 patches are fine, and I will probably take those.

Re: [PATCH 4/5] ss: Get udp sockets info via sock-diag

From: Stephen Hemminger <hidden>
Date: 2012-10-27 00:52:43

On Thu, 25 Oct 2012 17:24:58 +0400
Pavel Emelyanov [off-list ref] wrote:

Now everything is prepared for it, so the patch is straightforward.

Signed-off-by: Pavel Emelyanov <redacted>

1-4 standalone and do not require latest kernel; therefore applied

Please resubmit #5 during next merge window.

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