inet: Disable dumping of shutdown sockets

This requires more work than for unix sockets. For now
report that we cannot do it.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>

include/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 */

include/sk-inet.h

@@ -28,6 +28,7 @@ struct inet_sk_desc {
 	unsigned int		wqlen;
 	unsigned int		src_addr[4];
 	unsigned int		dst_addr[4];
+	unsigned short		shutdown;
 
 	int rfd;
 	struct list_head rlist;

sk-inet.c

@@ -95,6 +95,11 @@ static int can_dump_inet_sk(const struct inet_sk_desc *sk)
 		return 0;
 	}
 
+	if (sk->shutdown) {
+		pr_err("Can't dump shutdown inet socket\n");
+		return 0;
+	}
+
 	if (sk->type == SOCK_DGRAM)
 		return 1;
 
@@ -323,6 +328,11 @@ int inet_collect_one(struct nlmsghdr *h, int family, int type, int proto)
 	parse_rtattr(tb, INET_DIAG_MAX, (struct rtattr *)(m + 1),
 		     h->nlmsg_len - NLMSG_LENGTH(sizeof(*m)));
 
+	if (!tb[INET_DIAG_SHUTDOWN]) {
+		pr_err("Can't check shutdown state of inet socket\n");
+		return -1;
+	}
+
 	d = xzalloc(sizeof(*d));
 	if (!d)
 		return -1;
@@ -336,6 +346,7 @@ int inet_collect_one(struct nlmsghdr *h, int family, int type, int proto)
 	d->wqlen = m->idiag_wqueue;
 	memcpy(d->src_addr, m->id.idiag_src, sizeof(u32) * 4);
 	memcpy(d->dst_addr, m->id.idiag_dst, sizeof(u32) * 4);
+	d->shutdown = *(u8 *)RTA_DATA(tb[INET_DIAG_SHUTDOWN]);
 
 	ret = sk_collect_one(m->idiag_inode, family, &d->sd);