/* eBPF example program:
 * - creates arraymap in kernel with key 4 bytes and value 8 bytes
 *
 * - loads eBPF program:
 *   r0 = skb->data[ETH_HLEN + offsetof(struct iphdr, protocol)];
 *   *(u32*)(fp - 4) = r0;
 *   // assuming packet is IPv4, lookup ip->proto in a map
 *   value = bpf_map_lookup_elem(map_fd, fp - 4);
 *   if (value)
 *        (*(u64*)value) += 1;
 *
 * - attaches this program to eth0 raw socket
 *
 * - every second user space reads map[tcp], map[udp], map[icmp] to see
 *   how many packets of given protocol were seen on eth0
 */
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <linux/bpf.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <linux/if_ether.h>
#include <linux/ip.h>
#include <stddef.h>
#include "libbpf.h"
#include "sock_example.h"

char bpf_log_buf[BPF_LOG_BUF_SIZE];

static int test_sock(void)
{
	int sock = -1, map_fd, prog_fd, i, key;
	long long value = 0, tcp_cnt, udp_cnt, icmp_cnt;

	map_fd = bpf_create_map(BPF_MAP_TYPE_ARRAY, sizeof(key), sizeof(value),
				256, 0);
	if (map_fd < 0) {
		printf("failed to create map '%s'\n", strerror(errno));
		goto cleanup;
	}

	struct bpf_insn prog[] = {
		BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
		BPF_LD_ABS(BPF_B, ETH_HLEN + offsetof(struct iphdr, protocol) /* R0 = ip->proto */),
		BPF_STX_MEM(BPF_W, BPF_REG_10, BPF_REG_0, -4), /* *(u32 *)(fp - 4) = r0 */
		BPF_MOV64_REG(BPF_REG_2, BPF_REG_10),
		BPF_ALU64_IMM(BPF_ADD, BPF_REG_2, -4), /* r2 = fp - 4 */
		BPF_LD_MAP_FD(BPF_REG_1, map_fd),
		BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0, BPF_FUNC_map_lookup_elem),
		BPF_JMP_IMM(BPF_JEQ, BPF_REG_0, 0, 2),
		BPF_MOV64_IMM(BPF_REG_1, 1), /* r1 = 1 */
		BPF_RAW_INSN(BPF_STX | BPF_XADD | BPF_DW, BPF_REG_0, BPF_REG_1, 0, 0), /* xadd r0 += r1 */
		BPF_MOV64_IMM(BPF_REG_0, 0), /* r0 = 0 */
		BPF_EXIT_INSN(),
	};
	size_t insns_cnt = sizeof(prog) / sizeof(struct bpf_insn);

	prog_fd = bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, prog, insns_cnt,
				   "GPL", 0, bpf_log_buf, BPF_LOG_BUF_SIZE);
	if (prog_fd < 0) {
		printf("failed to load prog '%s'\n", strerror(errno));
		goto cleanup;
	}

	sock = open_raw_sock("lo");

	if (setsockopt(sock, SOL_SOCKET, SO_ATTACH_BPF, &prog_fd,
		       sizeof(prog_fd)) < 0) {
		printf("setsockopt %s\n", strerror(errno));
		goto cleanup;
	}

	for (i = 0; i < 10; i++) {
		key = IPPROTO_TCP;
		assert(bpf_map_lookup_elem(map_fd, &key, &tcp_cnt) == 0);

		key = IPPROTO_UDP;
		assert(bpf_map_lookup_elem(map_fd, &key, &udp_cnt) == 0);

		key = IPPROTO_ICMP;
		assert(bpf_map_lookup_elem(map_fd, &key, &icmp_cnt) == 0);

		printf("TCP %lld UDP %lld ICMP %lld packets\n",
		       tcp_cnt, udp_cnt, icmp_cnt);
		sleep(1);
	}

cleanup:
	/* maps, programs, raw sockets will auto cleanup on process exit */
	return 0;
}

int main(void)
{
	FILE *f;

	f = popen("ping -c5 localhost", "r");
	(void)f;

	return test_sock();
}
erf</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/python?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>python</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='b5b46c4740aed1538544f0fa849c5b76c7823469'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Jiri Slaby &lt;jslaby@suse.cz&gt;</td><td class='right'>2017-01-18 14:29:21 +0100</td></tr>
<tr><th>committer</th><td>Ingo Molnar &lt;mingo@kernel.org&gt;</td><td class='right'>2017-01-19 08:39:44 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/python?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>b5b46c4740aed1538544f0fa849c5b76c7823469</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/python?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>125e7aced4835bad6f6a0c0d02d012f333caf922</a> /<a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/python?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>tools/perf/python</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/python?id=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>fa19a769f82fb9a5ca000b83cacd13fcaeda51ac</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/python?id=b5b46c4740aed1538544f0fa849c5b76c7823469&amp;id2=fa19a769f82fb9a5ca000b83cacd13fcaeda51ac'>diff</a>)</td></tr></table>
<div class='commit-subject'>objtool: Fix IRET's opcode</div><div class='commit-msg'>The IRET opcode is 0xcf according to the Intel manual and also to objdump of my
vmlinux:

    1ea8:       48 cf                   iretq

Fix the opcode in arch_decode_instruction().

The previous value (0xc5) seems to correspond to LDS.

Signed-off-by: Jiri Slaby &lt;jslaby@suse.cz&gt;
Acked-by: Josh Poimboeuf &lt;jpoimboe@redhat.com&gt;
Cc: Andy Lutomirski &lt;luto@kernel.org&gt;
Cc: Borislav Petkov &lt;bp@alien8.de&gt;
Cc: Brian Gerst &lt;brgerst@gmail.com&gt;
Cc: Denys Vlasenko &lt;dvlasenk@redhat.com&gt;
Cc: H. Peter Anvin &lt;hpa@zytor.com&gt;
Cc: Linus Torvalds &lt;torvalds@linux-foundation.org&gt;
Cc: Peter Zijlstra &lt;peterz@infradead.org&gt;
Cc: Thomas Gleixner &lt;tglx@linutronix.de&gt;
Link: http://lkml.kernel.org/r/20170118132921.19319-1-jslaby@suse.cz
Signed-off-by: Ingo Molnar &lt;mingo@kernel.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=b5b46c4740aed1538544f0fa849c5b76c7823469'>Diffstat</a> (limited to 'tools/perf/python')</div><table summary='diffstat' class='diffstat'>