tools/testing/selftests/bpf/connect6_prog.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 // Copyright (c) 2018 Facebook
   3
   4 #include <string.h>
   5
   6 #include <linux/stddef.h>
   7 #include <linux/bpf.h>
   8 #include <linux/in.h>
   9 #include <linux/in6.h>
  10 #include <sys/socket.h>
  11
  12 #include "bpf_helpers.h"
  13 #include "bpf_endian.h"
  14
  15 #define SRC_REWRITE_IP6_0       0
  16 #define SRC_REWRITE_IP6_1       0
  17 #define SRC_REWRITE_IP6_2       0
  18 #define SRC_REWRITE_IP6_3       6
  19
  20 #define DST_REWRITE_IP6_0       0
  21 #define DST_REWRITE_IP6_1       0
  22 #define DST_REWRITE_IP6_2       0
  23 #define DST_REWRITE_IP6_3       1
  24
  25 #define DST_REWRITE_PORT6       6666
  26
  27 int _version SEC("version") = 1;
  28
  29 SEC("cgroup/connect6")
  30 int connect_v6_prog(struct bpf_sock_addr *ctx)
  31 {
  32         struct sockaddr_in6 sa;
  33
  34         /* Rewrite destination. */
  35         ctx->user_ip6[0] = bpf_htonl(DST_REWRITE_IP6_0);
  36         ctx->user_ip6[1] = bpf_htonl(DST_REWRITE_IP6_1);
  37         ctx->user_ip6[2] = bpf_htonl(DST_REWRITE_IP6_2);
  38         ctx->user_ip6[3] = bpf_htonl(DST_REWRITE_IP6_3);
  39
  40         ctx->user_port = bpf_htons(DST_REWRITE_PORT6);
  41
  42         if (ctx->type == SOCK_DGRAM || ctx->type == SOCK_STREAM) {
  43                 /* Rewrite source. */
  44                 memset(&sa, 0, sizeof(sa));
  45
  46                 sa.sin6_family = AF_INET6;
  47                 sa.sin6_port = bpf_htons(0);
  48
  49                 sa.sin6_addr.s6_addr32[0] = bpf_htonl(SRC_REWRITE_IP6_0);
  50                 sa.sin6_addr.s6_addr32[1] = bpf_htonl(SRC_REWRITE_IP6_1);
  51                 sa.sin6_addr.s6_addr32[2] = bpf_htonl(SRC_REWRITE_IP6_2);
  52                 sa.sin6_addr.s6_addr32[3] = bpf_htonl(SRC_REWRITE_IP6_3);
  53
  54                 if (bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa)) != 0)
  55                         return 0;
  56         }
  57
  58         return 1;
  59 }
  60
  61 char _license[] SEC("license") = "GPL";