tools/testing/selftests/bpf/progs/netns_cookie_prog.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include "vmlinux.h"
   4
   5 #include <bpf/bpf_helpers.h>
   6
   7 #define AF_INET6 10
   8
   9 struct {
  10         __uint(type, BPF_MAP_TYPE_SK_STORAGE);
  11         __uint(map_flags, BPF_F_NO_PREALLOC);
  12         __type(key, int);
  13         __type(value, int);
  14 } sockops_netns_cookies SEC(".maps");
  15
  16 struct {
  17         __uint(type, BPF_MAP_TYPE_SK_STORAGE);
  18         __uint(map_flags, BPF_F_NO_PREALLOC);
  19         __type(key, int);
  20         __type(value, int);
  21 } sk_msg_netns_cookies SEC(".maps");
  22
  23 struct {
  24         __uint(type, BPF_MAP_TYPE_SOCKMAP);
  25         __uint(max_entries, 2);
  26         __type(key, __u32);
  27         __type(value, __u64);
  28 } sock_map SEC(".maps");
  29
  30 int tcx_init_netns_cookie, tcx_netns_cookie;
  31
  32 SEC("sockops")
  33 int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
  34 {
  35         struct bpf_sock *sk = ctx->sk;
  36         int *cookie;
  37         __u32 key = 0;
  38
  39         if (ctx->family != AF_INET6)
  40                 return 1;
  41
  42         if (!sk)
  43                 return 1;
  44
  45         switch (ctx->op) {
  46         case BPF_SOCK_OPS_TCP_CONNECT_CB:
  47                 cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0,
  48                                             BPF_SK_STORAGE_GET_F_CREATE);
  49                 if (!cookie)
  50                         return 1;
  51
  52                 *cookie = bpf_get_netns_cookie(ctx);
  53                 break;
  54         case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
  55                 bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST);
  56                 break;
  57         default:
  58                 break;
  59         }
  60
  61         return 1;
  62 }
  63
  64 SEC("sk_msg")
  65 int get_netns_cookie_sk_msg(struct sk_msg_md *msg)
  66 {
  67         struct bpf_sock *sk = msg->sk;
  68         int *cookie;
  69
  70         if (msg->family != AF_INET6)
  71                 return 1;
  72
  73         if (!sk)
  74                 return 1;
  75
  76         cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0,
  77                                     BPF_SK_STORAGE_GET_F_CREATE);
  78         if (!cookie)
  79                 return 1;
  80
  81         *cookie = bpf_get_netns_cookie(msg);
  82
  83         return 1;
  84 }
  85
  86 SEC("tcx/ingress")
  87 int get_netns_cookie_tcx(struct __sk_buff *skb)
  88 {
  89         tcx_init_netns_cookie = bpf_get_netns_cookie(NULL);
  90         tcx_netns_cookie = bpf_get_netns_cookie(skb);
  91         return TCX_PASS;
  92 }
  93
  94 char _license[] SEC("license") = "GPL";