49 lines
1000 B
C
49 lines
1000 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/stddef.h>
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#include <linux/bpf.h>
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#include <linux/in6.h>
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#include <sys/socket.h>
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_endian.h>
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#include <bpf_sockopt_helpers.h>
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#define SERV6_IP_0 0xfaceb00c /* face:b00c:1234:5678::abcd */
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#define SERV6_IP_1 0x12345678
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#define SERV6_IP_2 0x00000000
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#define SERV6_IP_3 0x0000abcd
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#define SERV6_PORT 6060
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SEC("cgroup/recvmsg6")
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int recvmsg6_prog(struct bpf_sock_addr *ctx)
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{
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struct bpf_sock *sk;
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__u32 user_ip4;
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__u16 user_port;
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sk = ctx->sk;
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if (!sk)
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return 1;
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if (sk->family != AF_INET6)
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return 1;
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if (ctx->type != SOCK_STREAM && ctx->type != SOCK_DGRAM)
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return 1;
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if (!get_set_sk_priority(ctx))
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return 1;
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ctx->user_ip6[0] = bpf_htonl(SERV6_IP_0);
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ctx->user_ip6[1] = bpf_htonl(SERV6_IP_1);
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ctx->user_ip6[2] = bpf_htonl(SERV6_IP_2);
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ctx->user_ip6[3] = bpf_htonl(SERV6_IP_3);
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ctx->user_port = bpf_htons(SERV6_PORT);
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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