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>

2 files changed, 127 insertions, 23 deletions

diff --git a/samples/bpf/cookie_uid_helper_example.c b/samples/bpf/cookie_uid_helper_example.c
index f6e5e58931c5..ad5afedf2e70 100644
--- a/samples/bpf/cookie_uid_helper_example.c
+++ b/samples/bpf/cookie_uid_helper_example.c
@@ -4,10 +4,11 @@
  * program into the xt_bpf match.
  *
  * TEST:
- * ./run_cookie_uid_helper_example.sh
- * Then generate some traffic in variate ways. ping 0 -c 10 would work
- * but the cookie and uid in this case could both be 0. A sample output
- * with some traffic generated by web browser is shown below:
+ * ./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
@@ -18,6 +19,10 @@
  * 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.
@@ -34,6 +39,8 @@
 #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>
@@ -46,6 +53,8 @@
 #include <bpf/bpf.h>
 #include "libbpf.h"
 
+#define PORT 8888
+
 struct stats {
         uint32_t uid;
         uint64_t packets;
@@ -54,6 +63,8 @@ struct stats {
 
 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),
@@ -164,7 +175,7 @@ static void prog_attach_iptables(char *file)
                 printf("file path too long: %s\n", file);
                 exit(1);
         }
-        sprintf(rules, "iptables -A INPUT -m bpf --object-pinned %s -j ACCEPT",
+        sprintf(rules, "iptables -A OUTPUT -m bpf --object-pinned %s -j ACCEPT",
                 file);
         ret = system(rules);
         if (ret < 0) {
@@ -177,7 +188,8 @@ static void print_table(void)
 {
         struct stats curEntry;
         uint32_t curN = UINT32_MAX;
-        uint32_t nextN, res;
+        uint32_t nextN;
+        int res;
 
         while (bpf_map_get_next_key(map_fd, &curN, &nextN) > -1) {
                 curN = nextN;
@@ -193,25 +205,117 @@ static void print_table(void)
         }
 }
 
-int main(int argc, char *argv[])
+static void udp_client(void)
 {
-        if (argc > 2) {
-                printf("Too many argument provided\n");
-                return 1;
-        } else if (argc < 2) {
-                printf("Usage: %s bpfObjName\n", argv[0]);
-                return 1;
+        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, "revieve\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);
+}
 
-        maps_create();
-        prog_load();
-        prog_attach_iptables(argv[1]);
+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;
+}
 
-        while (true) {
-                print_table();
-                printf("\n");
-                sleep(1);
-        };
+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;