LXR linux/tools/testing/selftests/bpf/progs/recvmsg6

   1// SPDX-License-Identifier: GPL-2.0
   2
   3#include <linux/stddef.h>
   4#include <linux/bpf.h>
   5#include <linux/in6.h>
   6#include <sys/socket.h>
   7
   8#include <bpf/bpf_helpers.h>
   9#include <bpf/bpf_endian.h>
  10
  11#include <bpf_sockopt_helpers.h>
  12
  13#define SERV6_IP_0              0xfaceb00c /* face:b00c:1234:5678::abcd */
  14#define SERV6_IP_1              0x12345678
  15#define SERV6_IP_2              0x00000000
  16#define SERV6_IP_3              0x0000abcd
  17#define SERV6_PORT              6060
  18
  19SEC("cgroup/recvmsg6")
  20int recvmsg6_prog(struct bpf_sock_addr *ctx)
  21{
  22        struct bpf_sock *sk;
  23        __u32 user_ip4;
  24        __u16 user_port;
  25
  26        sk = ctx->sk;
  27        if (!sk)
  28                return 1;
  29
  30        if (sk->family != AF_INET6)
  31                return 1;
  32
  33        if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
  34                return 1;
  35
  36        if (!get_set_sk_priority(ctx))
  37                return 1;
  38
  39        ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);
  40        ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);
  41        ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);
  42        ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);
  43        ctx->user_port = bpf_htons(SERV6_PORT);
  44
  45        return 1;
  46}
  47
  48char _license[] SEC("license") = "GPL";
  49