47 lines · c
1// SPDX-License-Identifier: GPL-2.02 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 0x1234567815#define SERV6_IP_2 0x0000000016#define SERV6_IP_3 0x0000abcd17#define SERV6_PORT 606018 19SEC("cgroup/recvmsg6")20int recvmsg6_prog(struct bpf_sock_addr *ctx)21{22 struct bpf_sock *sk;23 24 sk = ctx->sk;25 if (!sk)26 return 1;27 28 if (sk->family != AF_INET6)29 return 1;30 31 if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)32 return 1;33 34 if (!get_set_sk_priority(ctx))35 return 1;36 37 ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);38 ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);39 ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);40 ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);41 ctx->user_port = bpf_htons(SERV6_PORT);42 43 return 1;44}45 46char _license[] SEC("license") = "GPL";47