netlink: add a basic netlink socket diag parser

* Makefile.am (strace_SOURCES): Add netlink_sock_diag.c.
(EXTRA_DIST): Add linux/packet_diag.h and linux/smc_diag.h.
* defs.h (ethernet_protocols, inet_protocols)
(socktypes): New xlat prototype.
(decode_netlink_sock_diag): New prototype.
* netlink.c (decode_specific_proto): New function.
(decode_specific_proto): Use decode_netlink_sock_diag.
(decode_payload): Use decode_specific_proto.
* netlink_sock_diag.c: New file.
* linux/inet_diag.h: Import linux headers.
* linux/netlink_diag.h: Likewise.
* linux/unix_diag.h: Likewise.
* linux/packet_diag.h: New file.
* linux/smc_diag.h: Likewise.
* xlat/inet_diag_extended_flags.in: Likewise.
* xlat/netlink_diag_show.in: Likewise.
* xlat/netlink_sock_states.in: Likewise.
* xlat/packet_diag_show.in: Likewise.
* xlat/smc_diag_extended_flags.in: Likewise.
* xlat/smc_sock_states.in: Likewise.
* xlat/tcp_sock_state_flags.in: Likewise.
* xlat/tcp_sock_states.in: Likewise.
* xlat/unix_diag_show.in: Likewise.

Co-authored-by: JingPiao Chen <chenjingpiao@gmail.com>

Author: fabiensiron

Makefile.am

@@ -172,6 +172,7 @@ strace_SOURCES =	\
 	native_defs.h	\
 	net.c		\
 	netlink.c       \
+	netlink_sock_diag.c \
 	nsfs.c          \
 	nsfs.h          \
 	nsig.h		\
@@ -562,6 +563,7 @@ EXTRA_DIST =				\
 	linux/or1k/set_scno.c		\
 	linux/or1k/syscallent.h		\
 	linux/or1k/userent.h		\
+	linux/packet_diag.h		\
 	linux/personality.h		\
 	linux/powerpc/arch_regs.c	\
 	linux/powerpc/arch_regs.h	\
@@ -678,6 +680,7 @@ EXTRA_DIST =				\
 	linux/sh64/syscallent.h		\
 	linux/sh64/userent.h		\
 	linux/signalent.h		\
+	linux/smc_diag.h		\
 	linux/sock_diag.h		\
 	linux/sparc/arch_getrval2.c	\
 	linux/sparc/arch_regs.c		\

defs.h

@@ -295,7 +295,9 @@ extern const struct xlat addrfams[];
 extern const struct xlat at_flags[];
 extern const struct xlat clocknames[];
 extern const struct xlat dirent_types[];
+extern const struct xlat ethernet_protocols[];
 extern const struct xlat evdev_abs[];
+extern const struct xlat inet_protocols[];
 extern const struct xlat msg_flags[];
 extern const struct xlat netlink_protocols[];
 extern const struct xlat open_access_modes[];
@@ -304,6 +306,7 @@ extern const struct xlat resource_flags[];
 extern const struct xlat setns_types[];
 extern const struct xlat sg_io_info[];
 extern const struct xlat socketlayers[];
+extern const struct xlat socktypes[];
 extern const struct xlat whence_codes[];
 
 /* Format of syscall return values */
@@ -623,6 +626,9 @@ tprint_iov_upto(struct tcb *, kernel_ulong_t len, kernel_ulong_t addr,
 
 extern void
 decode_netlink(struct tcb *, int, kernel_ulong_t addr, kernel_ulong_t len);
+extern bool
+decode_netlink_sock_diag(struct tcb *, kernel_ulong_t addr,
+			 kernel_ulong_t len, unsigned int, int);
 
 extern void tprint_open_modes(unsigned int);
 extern const char *sprint_open_modes(unsigned int);

linux/inet_diag.h

@@ -14,7 +14,17 @@ struct inet_diag_sockid {
 	uint32_t idiag_cookie[2];
 };
 
-/* Request structure */
+/* Request structures */
+struct inet_diag_req {
+	uint8_t idiag_family;
+	uint8_t idiag_src_len;
+	uint8_t idiag_dst_len;
+	uint8_t idiag_ext;
+	struct inet_diag_sockid id;
+	uint32_t idiag_states;
+	uint32_t idiag_dbs;
+};
+
 struct inet_diag_req_v2 {
 	uint8_t sdiag_family;
 	uint8_t sdiag_protocol;
@@ -40,4 +50,28 @@ struct inet_diag_msg {
 	uint32_t idiag_inode;
 };
 
+/* Extensions */
+enum {
+	INET_DIAG_NONE,
+	INET_DIAG_MEMINFO,
+	INET_DIAG_INFO,
+	INET_DIAG_VEGASINFO,
+	INET_DIAG_CONG,
+	INET_DIAG_TOS,
+	INET_DIAG_TCLASS,
+	INET_DIAG_SKMEMINFO,
+	INET_DIAG_SHUTDOWN,
+	INET_DIAG_DCTCPINFO,
+	INET_DIAG_PROTOCOL,  /* response attribute only */
+	INET_DIAG_SKV6ONLY,
+	INET_DIAG_LOCALS,
+	INET_DIAG_PEERS,
+	INET_DIAG_PAD,
+	INET_DIAG_MARK,
+	INET_DIAG_BBRINFO,
+	__INET_DIAG_MAX,
+};
+
+#define INET_DIAG_MAX (__INET_DIAG_MAX - 1)
+
 #endif /* !STRACE_LINUX_INET_DIAG_H */

linux/netlink_diag.h

@@ -24,6 +24,9 @@ struct netlink_diag_msg {
 };
 
 #define NDIAG_SHOW_MEMINFO           0x00000001
+#define NDIAG_SHOW_GROUPS	     0x00000002
+/* deprecated since 4.6 */
+#define NDIAG_SHOW_RING_CFG          0x00000004
 #define NDIAG_PROTO_ALL              ((uint8_t) ~0)
 
 #endif /* !STRACE_LINUX_NETLINK_DIAG_H */

linux/packet_diag.h

@@ -0,0 +1,29 @@
+#ifndef STRACE_LINUX_PACKET_DIAG_H
+#define STRACE_LINUX_PACKET_DIAG_H
+
+struct packet_diag_req {
+	uint8_t sdiag_family;
+	uint8_t sdiag_protocol;
+	uint16_t pad;
+	uint32_t pdiag_ino;
+	uint32_t pdiag_show;
+	uint32_t pdiag_cookie[2];
+};
+
+#define PACKET_SHOW_INFO	0x00000001 /* Basic packet_sk information */
+#define PACKET_SHOW_MCLIST	0x00000002 /* A set of packet_diag_mclist-s */
+#define PACKET_SHOW_RING_CFG	0x00000004 /* Rings configuration parameters */
+#define PACKET_SHOW_FANOUT	0x00000008
+#define PACKET_SHOW_MEMINFO	0x00000010
+#define PACKET_SHOW_FILTER	0x00000020
+
+struct packet_diag_msg {
+	uint8_t pdiag_family;
+	uint8_t pdiag_type;
+	uint16_t pdiag_num;
+
+	uint32_t pdiag_ino;
+	uint32_t pdiag_cookie[2];
+};
+
+#endif /* !STRACE_LINUX_PACKET_DIAG_H */

linux/smc_diag.h

@@ -0,0 +1,40 @@
+#ifndef STRACE_LINUX_SMC_DIAG_H
+#define STRACE_LINUX_SMC_DIAG_H
+
+#include <linux/inet_diag.h>
+
+/* Request structure */
+struct smc_diag_req {
+	uint8_t diag_family;
+	uint8_t pad[2];
+	uint8_t diag_ext;		/* Query extended information */
+	struct inet_diag_sockid	id;
+};
+
+/* Base info structure. It contains socket identity (addrs/ports/cookie) based
+ * on the internal clcsock, and more SMC-related socket data
+ */
+struct smc_diag_msg {
+	uint8_t diag_family;
+	uint8_t diag_state;
+	uint8_t diag_fallback;
+	uint8_t diag_shutdown;
+	struct inet_diag_sockid id;
+
+	uint32_t diag_uid;
+	uint64_t diag_inode;
+};
+
+/* Extensions */
+
+enum {
+	SMC_DIAG_NONE,
+	SMC_DIAG_CONNINFO,
+	SMC_DIAG_LGRINFO,
+	SMC_DIAG_SHUTDOWN,
+	__SMC_DIAG_MAX,
+};
+
+#define SMC_DIAG_MAX (__SMC_DIAG_MAX - 1)
+
+#endif /* !STRACE_LINUX_SMC_DIAG_H */

linux/unix_diag.h

@@ -11,8 +11,12 @@ struct unix_diag_req {
 	uint32_t udiag_cookie[2];
 };
 
-#define UDIAG_SHOW_NAME		0x01
-#define UDIAG_SHOW_PEER		0x04
+#define UDIAG_SHOW_NAME		0x00000001	/* show name (not path) */
+#define UDIAG_SHOW_VFS		0x00000002	/* show VFS inode info */
+#define UDIAG_SHOW_PEER		0x00000004	/* show peer socket info */
+#define UDIAG_SHOW_ICONS	0x00000008	/* show pending connections */
+#define UDIAG_SHOW_RQLEN	0x00000010	/* show skb receive queue len */
+#define UDIAG_SHOW_MEMINFO	0x00000020	/* show memory info of a socket */
 
 struct unix_diag_msg {
 	uint8_t	 udiag_family;

netlink.c

@@ -209,6 +209,25 @@ decode_nlmsgerr(struct tcb *const tcp, int fd,
 	tprints("}");
 }
 
+static bool
+decode_specific_proto(struct tcb *const tcp, int fd,
+		      const struct nlmsghdr *const nlmsghdr,
+		      const kernel_ulong_t addr,
+		      const kernel_ulong_t len)
+{
+	int proto = getfdnlproto(tcp, fd, netlink_protocols);
+
+	switch (proto) {
+	case NETLINK_SOCK_DIAG:
+		return decode_netlink_sock_diag(tcp, addr, len,
+						nlmsghdr->nlmsg_type,
+						nlmsghdr->nlmsg_flags &
+						NLM_F_REQUEST);
+	default:
+		return false;
+	}
+}
+
 static void
 decode_payload(struct tcb *const tcp, int fd,
 	       const struct nlmsghdr *const nlmsghdr,
@@ -218,6 +237,8 @@ decode_payload(struct tcb *const tcp, int fd,
 	if (nlmsghdr->nlmsg_type == NLMSG_ERROR) {
 		decode_nlmsgerr(tcp, fd, addr, len);
 		return;
+	} else if (decode_specific_proto(tcp, fd, nlmsghdr, addr, len)) {
+		return;
 	} else if (nlmsghdr->nlmsg_type == NLMSG_DONE && len == sizeof(int)) {
 		int total_len;