324 lines
9.2 KiB
C
324 lines
9.2 KiB
C
/* This test is a demo of using get_socket_uid and get_socket_cookie
|
|
* helper function to do per socket based network traffic monitoring.
|
|
* It requires iptables version higher then 1.6.1. to load pinned eBPF
|
|
* program into the xt_bpf match.
|
|
*
|
|
* TEST:
|
|
* ./run_cookie_uid_helper_example.sh -option
|
|
* option:
|
|
* -t: do traffic monitoring test, the program will continuously
|
|
* print out network traffic happens after program started A sample
|
|
* output is shown below:
|
|
*
|
|
* cookie: 877, uid: 0x3e8, Pakcet Count: 20, Bytes Count: 11058
|
|
* cookie: 132, uid: 0x0, Pakcet Count: 2, Bytes Count: 286
|
|
* cookie: 812, uid: 0x3e8, Pakcet Count: 3, Bytes Count: 1726
|
|
* cookie: 802, uid: 0x3e8, Pakcet Count: 2, Bytes Count: 104
|
|
* cookie: 877, uid: 0x3e8, Pakcet Count: 20, Bytes Count: 11058
|
|
* cookie: 831, uid: 0x3e8, Pakcet Count: 2, Bytes Count: 104
|
|
* cookie: 0, uid: 0x0, Pakcet Count: 6, Bytes Count: 712
|
|
* cookie: 880, uid: 0xfffe, Pakcet Count: 1, Bytes Count: 70
|
|
*
|
|
* -s: do getsockopt SO_COOKIE test, the program will set up a pair of
|
|
* UDP sockets and send packets between them. And read out the traffic data
|
|
* directly from the ebpf map based on the socket cookie.
|
|
*
|
|
* Clean up: if using shell script, the script file will delete the iptables
|
|
* rule and unmount the bpf program when exit. Else the iptables rule need
|
|
* to be deleted by hand, see run_cookie_uid_helper_example.sh for detail.
|
|
*/
|
|
|
|
#define _GNU_SOURCE
|
|
|
|
#define offsetof(type, member) __builtin_offsetof(type, member)
|
|
#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*(x)))
|
|
|
|
#include <arpa/inet.h>
|
|
#include <errno.h>
|
|
#include <error.h>
|
|
#include <limits.h>
|
|
#include <linux/bpf.h>
|
|
#include <linux/if_ether.h>
|
|
#include <net/if.h>
|
|
#include <signal.h>
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/types.h>
|
|
#include <unistd.h>
|
|
#include <bpf/bpf.h>
|
|
#include "bpf_insn.h"
|
|
|
|
#define PORT 8888
|
|
|
|
struct stats {
|
|
uint32_t uid;
|
|
uint64_t packets;
|
|
uint64_t bytes;
|
|
};
|
|
|
|
static int map_fd, prog_fd;
|
|
|
|
static bool test_finish;
|
|
|
|
static void maps_create(void)
|
|
{
|
|
map_fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(uint32_t),
|
|
sizeof(struct stats), 100, 0);
|
|
if (map_fd < 0)
|
|
error(1, errno, "map create failed!\n");
|
|
}
|
|
|
|
static void prog_load(void)
|
|
{
|
|
static char log_buf[1 << 16];
|
|
|
|
struct bpf_insn prog[] = {
|
|
/*
|
|
* Save sk_buff for future usage. value stored in R6 to R10 will
|
|
* not be reset after a bpf helper function call.
|
|
*/
|
|
BPF_MOV64_REG(BPF_REG_6, BPF_REG_1),
|
|
/*
|
|
* pc1: BPF_FUNC_get_socket_cookie takes one parameter,
|
|
* R1: sk_buff
|
|
*/
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_get_socket_cookie),
|
|
/* pc2-4: save &socketCookie to r7 for future usage*/
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0, -8),
|
|
BPF_MOV64_REG(BPF_REG_7, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_7, -8),
|
|
/*
|
|
* pc5-8: set up the registers for BPF_FUNC_map_lookup_elem,
|
|
* it takes two parameters (R1: map_fd, R2: &socket_cookie)
|
|
*/
|
|
BPF_LD_MAP_FD(BPF_REG_1, map_fd),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_map_lookup_elem),
|
|
/*
|
|
* pc9. if r0 != 0x0, go to pc+14, since we have the cookie
|
|
* stored already
|
|
* Otherwise do pc10-22 to setup a new data entry.
|
|
*/
|
|
BPF_JMP_IMM(BPF_JNE, BPF_REG_0, 0, 14),
|
|
BPF_MOV64_REG(BPF_REG_1, BPF_REG_6),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_get_socket_uid),
|
|
/*
|
|
* Place a struct stats in the R10 stack and sequentially
|
|
* place the member value into the memory. Packets value
|
|
* is set by directly place a IMM value 1 into the stack.
|
|
*/
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_0,
|
|
-32 + (__s16)offsetof(struct stats, uid)),
|
|
BPF_ST_MEM(BPF_DW, BPF_REG_10,
|
|
-32 + (__s16)offsetof(struct stats, packets), 1),
|
|
/*
|
|
* __sk_buff is a special struct used for eBPF program to
|
|
* directly access some sk_buff field.
|
|
*/
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
|
|
offsetof(struct __sk_buff, len)),
|
|
BPF_STX_MEM(BPF_DW, BPF_REG_10, BPF_REG_1,
|
|
-32 + (__s16)offsetof(struct stats, bytes)),
|
|
/*
|
|
* add new map entry using BPF_FUNC_map_update_elem, it takes
|
|
* 4 parameters (R1: map_fd, R2: &socket_cookie, R3: &stats,
|
|
* R4: flags)
|
|
*/
|
|
BPF_LD_MAP_FD(BPF_REG_1, map_fd),
|
|
BPF_MOV64_REG(BPF_REG_2, BPF_REG_7),
|
|
BPF_MOV64_REG(BPF_REG_3, BPF_REG_10),
|
|
BPF_ALU64_IMM(BPF_ADD, BPF_REG_3, -32),
|
|
BPF_MOV64_IMM(BPF_REG_4, 0),
|
|
BPF_RAW_INSN(BPF_JMP | BPF_CALL, 0, 0, 0,
|
|
BPF_FUNC_map_update_elem),
|
|
BPF_JMP_IMM(BPF_JA, 0, 0, 5),
|
|
/*
|
|
* pc24-30 update the packet info to a exist data entry, it can
|
|
* be done by directly write to pointers instead of using
|
|
* BPF_FUNC_map_update_elem helper function
|
|
*/
|
|
BPF_MOV64_REG(BPF_REG_9, BPF_REG_0),
|
|
BPF_MOV64_IMM(BPF_REG_1, 1),
|
|
BPF_STX_XADD(BPF_DW, BPF_REG_9, BPF_REG_1,
|
|
offsetof(struct stats, packets)),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_6,
|
|
offsetof(struct __sk_buff, len)),
|
|
BPF_STX_XADD(BPF_DW, BPF_REG_9, BPF_REG_1,
|
|
offsetof(struct stats, bytes)),
|
|
BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_6,
|
|
offsetof(struct __sk_buff, len)),
|
|
BPF_EXIT_INSN(),
|
|
};
|
|
prog_fd = bpf_load_program(BPF_PROG_TYPE_SOCKET_FILTER, prog,
|
|
ARRAY_SIZE(prog), "GPL", 0,
|
|
log_buf, sizeof(log_buf));
|
|
if (prog_fd < 0)
|
|
error(1, errno, "failed to load prog\n%s\n", log_buf);
|
|
}
|
|
|
|
static void prog_attach_iptables(char *file)
|
|
{
|
|
int ret;
|
|
char rules[100];
|
|
|
|
if (bpf_obj_pin(prog_fd, file))
|
|
error(1, errno, "bpf_obj_pin");
|
|
if (strlen(file) > 50) {
|
|
printf("file path too long: %s\n", file);
|
|
exit(1);
|
|
}
|
|
sprintf(rules, "iptables -A OUTPUT -m bpf --object-pinned %s -j ACCEPT",
|
|
file);
|
|
ret = system(rules);
|
|
if (ret < 0) {
|
|
printf("iptables rule update failed: %d/n", WEXITSTATUS(ret));
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void print_table(void)
|
|
{
|
|
struct stats curEntry;
|
|
uint32_t curN = UINT32_MAX;
|
|
uint32_t nextN;
|
|
int res;
|
|
|
|
while (bpf_map_get_next_key(map_fd, &curN, &nextN) > -1) {
|
|
curN = nextN;
|
|
res = bpf_map_lookup_elem(map_fd, &curN, &curEntry);
|
|
if (res < 0) {
|
|
error(1, errno, "fail to get entry value of Key: %u\n",
|
|
curN);
|
|
} else {
|
|
printf("cookie: %u, uid: 0x%x, Packet Count: %lu,"
|
|
" Bytes Count: %lu\n", curN, curEntry.uid,
|
|
curEntry.packets, curEntry.bytes);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void udp_client(void)
|
|
{
|
|
struct sockaddr_in si_other = {0};
|
|
struct sockaddr_in si_me = {0};
|
|
struct stats dataEntry;
|
|
int s_rcv, s_send, i, recv_len;
|
|
char message = 'a';
|
|
char buf;
|
|
uint64_t cookie;
|
|
int res;
|
|
socklen_t cookie_len = sizeof(cookie);
|
|
socklen_t slen = sizeof(si_other);
|
|
|
|
s_rcv = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (s_rcv < 0)
|
|
error(1, errno, "rcv socket creat failed!\n");
|
|
si_other.sin_family = AF_INET;
|
|
si_other.sin_port = htons(PORT);
|
|
if (inet_aton("127.0.0.1", &si_other.sin_addr) == 0)
|
|
error(1, errno, "inet_aton\n");
|
|
if (bind(s_rcv, (struct sockaddr *)&si_other, sizeof(si_other)) == -1)
|
|
error(1, errno, "bind\n");
|
|
s_send = socket(PF_INET, SOCK_DGRAM, 0);
|
|
if (s_send < 0)
|
|
error(1, errno, "send socket creat failed!\n");
|
|
res = getsockopt(s_send, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
|
|
if (res < 0)
|
|
printf("get cookie failed: %s\n", strerror(errno));
|
|
res = bpf_map_lookup_elem(map_fd, &cookie, &dataEntry);
|
|
if (res != -1)
|
|
error(1, errno, "socket stat found while flow not active\n");
|
|
for (i = 0; i < 10; i++) {
|
|
res = sendto(s_send, &message, sizeof(message), 0,
|
|
(struct sockaddr *)&si_other, slen);
|
|
if (res == -1)
|
|
error(1, errno, "send\n");
|
|
if (res != sizeof(message))
|
|
error(1, 0, "%uB != %luB\n", res, sizeof(message));
|
|
recv_len = recvfrom(s_rcv, &buf, sizeof(buf), 0,
|
|
(struct sockaddr *)&si_me, &slen);
|
|
if (recv_len < 0)
|
|
error(1, errno, "receive\n");
|
|
res = memcmp(&(si_other.sin_addr), &(si_me.sin_addr),
|
|
sizeof(si_me.sin_addr));
|
|
if (res != 0)
|
|
error(1, EFAULT, "sender addr error: %d\n", res);
|
|
printf("Message received: %c\n", buf);
|
|
res = bpf_map_lookup_elem(map_fd, &cookie, &dataEntry);
|
|
if (res < 0)
|
|
error(1, errno, "lookup sk stat failed, cookie: %lu\n",
|
|
cookie);
|
|
printf("cookie: %lu, uid: 0x%x, Packet Count: %lu,"
|
|
" Bytes Count: %lu\n\n", cookie, dataEntry.uid,
|
|
dataEntry.packets, dataEntry.bytes);
|
|
}
|
|
close(s_send);
|
|
close(s_rcv);
|
|
}
|
|
|
|
static int usage(void)
|
|
{
|
|
printf("Usage: ./run_cookie_uid_helper_example.sh"
|
|
" bpfObjName -option\n"
|
|
" -t traffic monitor test\n"
|
|
" -s getsockopt cookie test\n");
|
|
return 1;
|
|
}
|
|
|
|
static void finish(int ret)
|
|
{
|
|
test_finish = true;
|
|
}
|
|
|
|
int main(int argc, char *argv[])
|
|
{
|
|
int opt;
|
|
bool cfg_test_traffic = false;
|
|
bool cfg_test_cookie = false;
|
|
|
|
if (argc != 3)
|
|
return usage();
|
|
while ((opt = getopt(argc, argv, "ts")) != -1) {
|
|
switch (opt) {
|
|
case 't':
|
|
cfg_test_traffic = true;
|
|
break;
|
|
case 's':
|
|
cfg_test_cookie = true;
|
|
break;
|
|
|
|
default:
|
|
printf("unknown option %c\n", opt);
|
|
usage();
|
|
return -1;
|
|
}
|
|
}
|
|
maps_create();
|
|
prog_load();
|
|
prog_attach_iptables(argv[2]);
|
|
if (cfg_test_traffic) {
|
|
if (signal(SIGINT, finish) == SIG_ERR)
|
|
error(1, errno, "register SIGINT handler failed");
|
|
if (signal(SIGTERM, finish) == SIG_ERR)
|
|
error(1, errno, "register SIGTERM handler failed");
|
|
while (!test_finish) {
|
|
print_table();
|
|
printf("\n");
|
|
sleep(1);
|
|
};
|
|
} else if (cfg_test_cookie) {
|
|
udp_client();
|
|
}
|
|
close(prog_fd);
|
|
close(map_fd);
|
|
return 0;
|
|
}
|