Sample program using SO_COOKIE
Added a per socket traffic monitoring option to illustrate the usage of new getsockopt SO_COOKIE. The program is based on the socket traffic monitoring program using xt_eBPF and in the new option the data entry can be directly accessed using socket cookie. The cookie retrieved allow us to lookup an element in the eBPF for a specific socket. Signed-off-by: Chenbo Feng <fengc@google.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Chenbo Feng
David S. Miller
parent
5daab9db7b
commit
00f660eaf3
@ -4,10 +4,11 @@
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* program into the xt_bpf match.
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*
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* TEST:
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* ./run_cookie_uid_helper_example.sh
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* Then generate some traffic in variate ways. ping 0 -c 10 would work
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* but the cookie and uid in this case could both be 0. A sample output
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* with some traffic generated by web browser is shown below:
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* ./run_cookie_uid_helper_example.sh -option
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* option:
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* -t: do traffic monitoring test, the program will continuously
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* print out network traffic happens after program started A sample
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* output is shown below:
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*
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* cookie: 877, uid: 0x3e8, Pakcet Count: 20, Bytes Count: 11058
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* cookie: 132, uid: 0x0, Pakcet Count: 2, Bytes Count: 286
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@ -18,6 +19,10 @@
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* cookie: 0, uid: 0x0, Pakcet Count: 6, Bytes Count: 712
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* cookie: 880, uid: 0xfffe, Pakcet Count: 1, Bytes Count: 70
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*
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* -s: do getsockopt SO_COOKIE test, the program will set up a pair of
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* UDP sockets and send packets between them. And read out the traffic data
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* directly from the ebpf map based on the socket cookie.
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*
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* Clean up: if using shell script, the script file will delete the iptables
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* rule and unmount the bpf program when exit. Else the iptables rule need
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* to be deleted by hand, see run_cookie_uid_helper_example.sh for detail.
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@ -34,6 +39,8 @@
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#include <limits.h>
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#include <linux/bpf.h>
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#include <linux/if_ether.h>
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#include <net/if.h>
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#include <signal.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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@ -46,6 +53,8 @@
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#include <bpf/bpf.h>
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#include "libbpf.h"
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#define PORT 8888
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struct stats {
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uint32_t uid;
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uint64_t packets;
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@ -54,6 +63,8 @@ struct stats {
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static int map_fd, prog_fd;
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static bool test_finish;
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static void maps_create(void)
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{
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map_fd = bpf_create_map(BPF_MAP_TYPE_HASH, sizeof(uint32_t),
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@ -164,7 +175,7 @@ static void prog_attach_iptables(char *file)
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printf("file path too long: %s\n", file);
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exit(1);
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}
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sprintf(rules, "iptables -A INPUT -m bpf --object-pinned %s -j ACCEPT",
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sprintf(rules, "iptables -A OUTPUT -m bpf --object-pinned %s -j ACCEPT",
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file);
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ret = system(rules);
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if (ret < 0) {
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@ -177,7 +188,8 @@ static void print_table(void)
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{
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struct stats curEntry;
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uint32_t curN = UINT32_MAX;
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uint32_t nextN, res;
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uint32_t nextN;
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int res;
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while (bpf_map_get_next_key(map_fd, &curN, &nextN) > -1) {
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curN = nextN;
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@ -193,25 +205,117 @@ static void print_table(void)
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}
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}
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int main(int argc, char *argv[])
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static void udp_client(void)
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{
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if (argc > 2) {
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printf("Too many argument provided\n");
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return 1;
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} else if (argc < 2) {
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printf("Usage: %s bpfObjName\n", argv[0]);
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struct sockaddr_in si_other = {0};
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struct sockaddr_in si_me = {0};
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struct stats dataEntry;
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int s_rcv, s_send, i, recv_len;
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char message = 'a';
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char buf;
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uint64_t cookie;
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int res;
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socklen_t cookie_len = sizeof(cookie);
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socklen_t slen = sizeof(si_other);
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s_rcv = socket(PF_INET, SOCK_DGRAM, 0);
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if (s_rcv < 0)
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error(1, errno, "rcv socket creat failed!\n");
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si_other.sin_family = AF_INET;
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si_other.sin_port = htons(PORT);
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if (inet_aton("127.0.0.1", &si_other.sin_addr) == 0)
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error(1, errno, "inet_aton\n");
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if (bind(s_rcv, (struct sockaddr *)&si_other, sizeof(si_other)) == -1)
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error(1, errno, "bind\n");
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s_send = socket(PF_INET, SOCK_DGRAM, 0);
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if (s_send < 0)
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error(1, errno, "send socket creat failed!\n");
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res = getsockopt(s_send, SOL_SOCKET, SO_COOKIE, &cookie, &cookie_len);
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if (res < 0)
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printf("get cookie failed: %s\n", strerror(errno));
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res = bpf_map_lookup_elem(map_fd, &cookie, &dataEntry);
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if (res != -1)
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error(1, errno, "socket stat found while flow not active\n");
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for (i = 0; i < 10; i++) {
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res = sendto(s_send, &message, sizeof(message), 0,
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(struct sockaddr *)&si_other, slen);
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if (res == -1)
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error(1, errno, "send\n");
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if (res != sizeof(message))
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error(1, 0, "%uB != %luB\n", res, sizeof(message));
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recv_len = recvfrom(s_rcv, &buf, sizeof(buf), 0,
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(struct sockaddr *)&si_me, &slen);
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if (recv_len < 0)
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error(1, errno, "revieve\n");
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res = memcmp(&(si_other.sin_addr), &(si_me.sin_addr),
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sizeof(si_me.sin_addr));
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if (res != 0)
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error(1, EFAULT, "sender addr error: %d\n", res);
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printf("Message received: %c\n", buf);
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res = bpf_map_lookup_elem(map_fd, &cookie, &dataEntry);
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if (res < 0)
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error(1, errno, "lookup sk stat failed, cookie: %lu\n",
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cookie);
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printf("cookie: %lu, uid: 0x%x, Packet Count: %lu,"
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" Bytes Count: %lu\n\n", cookie, dataEntry.uid,
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dataEntry.packets, dataEntry.bytes);
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}
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close(s_send);
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close(s_rcv);
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}
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static int usage(void)
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{
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printf("Usage: ./run_cookie_uid_helper_example.sh"
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" bpfObjName -option\n"
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" -t traffic monitor test\n"
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" -s getsockopt cookie test\n");
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return 1;
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}
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void finish(int ret)
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{
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test_finish = true;
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}
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int main(int argc, char *argv[])
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{
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int opt;
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bool cfg_test_traffic = false;
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bool cfg_test_cookie = false;
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if (argc != 3)
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return usage();
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while ((opt = getopt(argc, argv, "ts")) != -1) {
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switch (opt) {
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case 't':
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cfg_test_traffic = true;
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break;
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case 's':
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cfg_test_cookie = true;
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break;
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default:
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printf("unknown option %c\n", opt);
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usage();
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return -1;
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}
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}
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maps_create();
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prog_load();
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prog_attach_iptables(argv[1]);
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while (true) {
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prog_attach_iptables(argv[2]);
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if (cfg_test_traffic) {
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if (signal(SIGINT, finish) == SIG_ERR)
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error(1, errno, "register handler failed");
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while (!test_finish) {
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print_table();
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printf("\n");
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sleep(1);
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};
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} else if (cfg_test_cookie) {
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udp_client();
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}
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close(prog_fd);
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close(map_fd);
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return 0;
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}
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4
samples/bpf/run_cookie_uid_helper_example.sh
Normal file → Executable file
4
samples/bpf/run_cookie_uid_helper_example.sh
Normal file → Executable file
@ -4,11 +4,11 @@ root_dir=$local_dir/../..
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mnt_dir=$(mktemp -d --tmp)
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on_exit() {
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iptables -D INPUT -m bpf --object-pinned ${mnt_dir}/bpf_prog -j ACCEPT
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iptables -D OUTPUT -m bpf --object-pinned ${mnt_dir}/bpf_prog -j ACCEPT
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umount ${mnt_dir}
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rm -r ${mnt_dir}
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}
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trap on_exit EXIT
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mount -t bpf bpf ${mnt_dir}
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./per_socket_stats_example ${mnt_dir}/bpf_prog
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./per_socket_stats_example ${mnt_dir}/bpf_prog $1
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