zdtm: test for packet socket mappings

It turned out we didn't have one, though recent 3.19-merge-window
kernel would crash on that test.
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Acked-by: Andrew Vagin <avagin@parallels.com>

test/zdtm.sh

@@ -69,6 +69,7 @@ static/cmdlinenv00
 static/socket_listen
 static/socket_listen6
 static/packet_sock
+static/packet_sock_mmap
 static/socket_udp
 static/sock_filter
 static/socket6_udp
@@ -224,6 +225,7 @@ ns/static/sk-unix-unconn
 ns/static/socket_listen
 ns/static/socket_listen6
 ns/static/packet_sock
+ns/static/packet_sock_mmap
 ns/static/socket_udp
 ns/static/sock_filter
 ns/static/socket6_udp
@@ -288,6 +290,7 @@ sock_opts00
 sock_opts01
 cmdlinenv00
 packet_sock
+packet_sock_mmap
 fanotify00
 sk-netlink
 tun

test/zdtm/live/static/Makefile

@@ -34,6 +34,7 @@ TST_NOFILE	=				\
 		socket_udplite			\
 		socket_aio			\
 		packet_sock			\
+		packet_sock_mmap		\
 		sock_filter			\
 		msgque				\
 		inotify_system			\

test/zdtm/live/static/packet_sock_mmap.c

+#include "zdtmtst.h"
+
+const char *test_doc = "static test for packet sockets mmaps";
+const char *test_author = "Pavel Emelyanov <xemul@parallels.com>";
+
+#include <stdio.h>
+#include <sys/types.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <string.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <arpa/inet.h>
+#include <sys/socket.h>
+#include <linux/version.h>
+#include <linux/if_packet.h>
+#include <net/ethernet.h>
+#include <sys/mman.h>
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,2,0)
+
+struct tpacket_req3 {
+	unsigned int tp_block_size;
+	unsigned int tp_block_nr;
+	unsigned int tp_frame_size;
+	unsigned int tp_frame_nr;
+	unsigned int tp_retire_blk_tov;
+	unsigned int tp_sizeof_priv;
+	unsigned int tp_feature_req_word;
+};
+
+#endif
+
+static void check_map_is_there(unsigned long addr, int sk)
+{
+	char name[128];
+	struct stat sk_s, link_s;
+
+	sprintf(name, "/proc/self/map_files/%lx-%lx",
+			addr, addr + 2 * 4096);
+
+	if (stat(name, &link_s) < 0) {
+		fail("No socket mapping\n");
+		return;
+	}
+
+	fstat(sk, &sk_s);
+	if ((sk_s.st_dev != link_s.st_dev) || (sk_s.st_ino != link_s.st_ino)) {
+		fail("Non-socket mapping restored\n");
+		return;
+	}
+
+	pass();
+}
+
+int main(int argc, char **argv)
+{
+	int sk;
+	struct tpacket_req3 ring;
+	void *mem;
+
+	test_init(argc, argv);
+
+	sk = socket(PF_PACKET, SOCK_RAW, 0);
+	if (sk < 0) {
+		err("Can't create socket 1");
+		return 1;
+	}
+
+	memset(&ring, 0, sizeof(ring));
+	ring.tp_block_size = 4096;
+	ring.tp_block_nr = 1;
+	ring.tp_frame_size = 1024;
+	ring.tp_frame_nr = 4;
+	if (setsockopt(sk, SOL_PACKET, PACKET_RX_RING, &ring, sizeof(ring)) < 0) {
+		err("Can't set rx ring %m");
+		return 1;
+	}
+
+	memset(&ring, 0, sizeof(ring));
+	ring.tp_block_size = 4096;
+	ring.tp_block_nr = 1;
+	ring.tp_frame_size = 1024;
+	ring.tp_frame_nr = 4;
+	if (setsockopt(sk, SOL_PACKET, PACKET_TX_RING, &ring, sizeof(ring)) < 0) {
+		err("Can't set tx ring %m");
+		return 1;
+	}
+
+	mem = mmap(NULL, 2 * 4096, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_FILE, sk, 0);
+	if (mem == MAP_FAILED) {
+		err("Can't mmap socket %m");
+		return 1;
+	}
+
+	test_daemon();
+	test_waitsig();
+
+	check_map_is_there((unsigned long)mem, sk);
+
+	return 0;
+}