strace/netlink_packet_diag-assorted-decoding-fixes.patch

From ac2f6695cd896d9b33f9b39efb167db7fb893d2d Mon Sep 17 00:00:00 2001
From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Mon, 27 Aug 2018 21:34:06 +0200
Subject: [PATCH 070/293] netlink_packet_diag: assorted decoding fixes

* xlat/af_packet_versions.in: New file.
* netlink_packet_diag.c: Include "xlat/af_packet_versions.h".
(decode_packet_diag_req): sdiag_protocol shouldn't be decoded as a protocol,
currently it should be set to 0.
(decode_packet_diag_info): Decode pdi_version field using af_packet_versions
xlat; decode pdi_index field as an interface index.
(packet_diag_msg_nla_decoders) <PACKET_DIAG_UID>: Decode using
decode_nla_uid.
(decode_packet_diag_msg): Decode pdiag_num as an low-level protocol.
* tests/netlink_sock_diag.c: Update expected output.
* tests/nlattr_packet_diag_msg.c: Likewise.
---
 netlink_packet_diag.c          | 22 ++++++++++++++--------
 tests/netlink_sock_diag.c      |  6 +++---
 tests/nlattr_packet_diag_msg.c | 15 ++++++++-------
 xlat/af_packet_versions.in     |  3 +++
 4 files changed, 28 insertions(+), 18 deletions(-)
 create mode 100644 xlat/af_packet_versions.in

diff --git a/netlink_packet_diag.c b/netlink_packet_diag.c
index 18b7091..9794f56 100644
--- a/netlink_packet_diag.c
+++ b/netlink_packet_diag.c
@@ -37,6 +37,7 @@
 #include <linux/sock_diag.h>
 #include <linux/packet_diag.h>
 
+#include "xlat/af_packet_versions.h"
 #include "xlat/packet_diag_attrs.h"
 #include "xlat/packet_diag_info_flags.h"
 #include "xlat/packet_diag_show.h"
@@ -52,10 +53,11 @@ DECL_NETLINK_DIAG_DECODER(decode_packet_diag_req)
 		if (!umoven_or_printaddr(tcp, addr + offset,
 					 sizeof(req) - offset,
 					 (char *) &req + offset)) {
-			tprints("sdiag_protocol=");
-			printxval_searchn(ethernet_protocols,
-					  ethernet_protocols_size,
-					  req.sdiag_protocol, "ETH_P_???");
+			/*
+			 * AF_PACKET currently doesn't support protocol values
+			 * other than 0.
+			 */
+			PRINT_FIELD_X("", req, sdiag_protocol);
 			PRINT_FIELD_U(", ", req, pdiag_ino);
 			PRINT_FIELD_FLAGS(", ", req, pdiag_show,
 					  packet_diag_show, "PACKET_SHOW_???");
@@ -79,8 +81,9 @@ decode_packet_diag_info(struct tcb *const tcp,
 	if (umove_or_printaddr(tcp, addr, &pinfo))
 		return true;
 
-	PRINT_FIELD_U("{", pinfo, pdi_index);
-	PRINT_FIELD_U(", ", pinfo, pdi_version);
+	PRINT_FIELD_IFINDEX("{", pinfo, pdi_index);
+	PRINT_FIELD_XVAL(", ", pinfo, pdi_version, af_packet_versions,
+			 "TPACKET_???");
 	PRINT_FIELD_U(", ", pinfo, pdi_reserve);
 	PRINT_FIELD_U(", ", pinfo, pdi_copy_thresh);
 	PRINT_FIELD_U(", ", pinfo, pdi_tstamp);
@@ -172,7 +175,7 @@ static const nla_decoder_t packet_diag_msg_nla_decoders[] = {
 	[PACKET_DIAG_RX_RING]	= decode_packet_diag_ring,
 	[PACKET_DIAG_TX_RING]	= decode_packet_diag_ring,
 	[PACKET_DIAG_FANOUT]	= decode_nla_u32,
-	[PACKET_DIAG_UID]	= decode_nla_u32,
+	[PACKET_DIAG_UID]	= decode_nla_uid,
 	[PACKET_DIAG_MEMINFO]	= decode_nla_meminfo,
 	[PACKET_DIAG_FILTER]	= decode_packet_diag_filter
 };
@@ -191,7 +194,10 @@ DECL_NETLINK_DIAG_DECODER(decode_packet_diag_msg)
 					 (char *) &msg + offset)) {
 			PRINT_FIELD_XVAL("", msg, pdiag_type,
 					 socktypes, "SOCK_???");
-			PRINT_FIELD_U(", ", msg, pdiag_num);
+			PRINT_FIELD_XVAL_SORTED_SIZED(", ", msg, pdiag_num,
+						      ethernet_protocols,
+						      ethernet_protocols_size,
+						      "ETH_P_???");
 			PRINT_FIELD_U(", ", msg, pdiag_ino);
 			PRINT_FIELD_COOKIE(", ", msg, pdiag_cookie);
 			decode_nla = true;
diff --git a/tests/netlink_sock_diag.c b/tests/netlink_sock_diag.c
index dfe3526..6049253 100644
--- a/tests/netlink_sock_diag.c
+++ b/tests/netlink_sock_diag.c
@@ -338,7 +338,7 @@ test_packet_diag_req(const int fd)
 	TEST_SOCK_DIAG(fd, nlh0, AF_PACKET,
 		       SOCK_DIAG_BY_FAMILY, NLM_F_REQUEST, req,
 		       printf("{sdiag_family=AF_PACKET"),
-		       printf(", sdiag_protocol=ETH_P_LOOP");
+		       printf(", sdiag_protocol=%#x", req.sdiag_protocol);
 		       PRINT_FIELD_U(", ", req, pdiag_ino);
 		       printf(", pdiag_show=PACKET_SHOW_INFO");
 		       PRINT_FIELD_COOKIE(", ", req, pdiag_cookie);
@@ -351,7 +351,7 @@ test_packet_diag_msg(const int fd)
 	static const struct packet_diag_msg msg = {
 		.pdiag_family = AF_PACKET,
 		.pdiag_type = SOCK_STREAM,
-		.pdiag_num = 0xbadc,
+		.pdiag_num = 0x9100,
 		.pdiag_ino = 0xfacefeed,
 		.pdiag_cookie = { 0xdeadbeef, 0xbadc0ded }
 	};
@@ -360,7 +360,7 @@ test_packet_diag_msg(const int fd)
 		       SOCK_DIAG_BY_FAMILY, NLM_F_DUMP, msg,
 		       printf("{pdiag_family=AF_PACKET"),
 		       printf(", pdiag_type=SOCK_STREAM");
-		       PRINT_FIELD_U(", ", msg, pdiag_num);
+		       printf(", pdiag_num=ETH_P_QINQ1");
 		       PRINT_FIELD_U(", ", msg, pdiag_ino);
 		       PRINT_FIELD_COOKIE(", ", msg, pdiag_cookie);
 		       printf("}"));
diff --git a/tests/nlattr_packet_diag_msg.c b/tests/nlattr_packet_diag_msg.c
index 016d052..6ac9907 100644
--- a/tests/nlattr_packet_diag_msg.c
+++ b/tests/nlattr_packet_diag_msg.c
@@ -51,7 +51,8 @@ init_packet_diag_msg(struct nlmsghdr *const nlh, const unsigned int msg_len)
 	struct packet_diag_msg *const msg = NLMSG_DATA(nlh);
 	SET_STRUCT(struct packet_diag_msg, msg,
 		.pdiag_family = AF_PACKET,
-		.pdiag_type = SOCK_STREAM
+		.pdiag_type = SOCK_STREAM,
+		.pdiag_num = 3,
 	);
 }
 
@@ -61,7 +62,7 @@ print_packet_diag_msg(const unsigned int msg_len)
 	printf("{len=%u, type=SOCK_DIAG_BY_FAMILY"
 	       ", flags=NLM_F_DUMP, seq=0, pid=0}"
 	       ", {pdiag_family=AF_PACKET"
-	       ", pdiag_type=SOCK_STREAM, pdiag_num=0"
+	       ", pdiag_type=SOCK_STREAM, pdiag_num=ETH_P_ALL"
 	       ", pdiag_ino=0, pdiag_cookie=[0, 0]}",
 	       msg_len);
 }
@@ -98,9 +99,9 @@ main(void)
 {
 	skip_if_unavailable("/proc/self/fd/");
 
-	static const struct packet_diag_info pinfo = {
-		.pdi_index = 0xabcddafa,
-		.pdi_version = 0xbabcdafb,
+	struct packet_diag_info pinfo = {
+		.pdi_index = ifindex_lo(),
+		.pdi_version = 2,
 		.pdi_reserve = 0xcfaacdaf,
 		.pdi_copy_thresh = 0xdabacdaf,
 		.pdi_tstamp = 0xeafbaadf,
@@ -143,8 +144,8 @@ main(void)
 	TEST_NLATTR_OBJECT(fd, nlh0, hdrlen,
 			   init_packet_diag_msg, print_packet_diag_msg,
 			   PACKET_DIAG_INFO, pattern, pinfo,
-			   PRINT_FIELD_U("{", pinfo, pdi_index);
-			   PRINT_FIELD_U(", ", pinfo, pdi_version);
+			   printf("{pdi_index=%s", IFINDEX_LO_STR);
+			   printf(", pdi_version=TPACKET_V3");
 			   PRINT_FIELD_U(", ", pinfo, pdi_reserve);
 			   PRINT_FIELD_U(", ", pinfo, pdi_copy_thresh);
 			   PRINT_FIELD_U(", ", pinfo, pdi_tstamp);
diff --git a/xlat/af_packet_versions.in b/xlat/af_packet_versions.in
new file mode 100644
index 0000000..399cdf4
--- /dev/null
+++ b/xlat/af_packet_versions.in
@@ -0,0 +1,3 @@
+TPACKET_V1	0
+TPACKET_V2	1
+TPACKET_V3	2
-- 
1.7.12.4