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// SPDX-License-Identifier: GPL-2.0
#include <linux/stddef.h>
#include <linux/bpf.h>
#include <linux/in6.h>
#include <sys/socket.h>
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_endian.h>
#include <bpf_sockopt_helpers.h>
#define SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */
#define SERV6_IP_1 0x12345678
#define SERV6_IP_2 0x00000000
#define SERV6_IP_3 0x0000abcd
#define SERV6_PORT 6060
SEC("cgroup/recvmsg6")
int recvmsg6_prog(struct bpf_sock_addr *ctx)
{
struct bpf_sock *sk;
__u32 user_ip4;
__u16 user_port;
sk = ctx->sk;
if (!sk)
return 1;
if (sk->family != AF_INET6)
return 1;
if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
return 1;
if (!get_set_sk_priority(ctx))
return 1;
ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);
ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);
ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);
ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);
ctx->user_port = bpf_htons(SERV6_PORT);
return 1;
}
char _license[] SEC("license") = "GPL";
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