1 // SPDX-License-Identifier: GPL-2.0-only 2 3 /* 4 * Copyright 2022 Google LLC. 5 */ 6 7 #include <linux/bpf.h> 8 #include <bpf/bpf_helpers.h> 9 #include <bpf/bpf_endian.h> 10 #include <netinet/in.h> 11 #include <sys/socket.h> 12 13 /* 2001:db8::1 */ 14 #define BINDADDR_V6 { { { 0x20,0x01,0x0d,0xb8,0,0,0,0,0,0,0,0,0,0,0,1 } } } 15 16 __u32 do_bind = 0; 17 __u32 has_error = 0; 18 __u32 invocations_v4 = 0; 19 __u32 invocations_v6 = 0; 20 21 SEC("cgroup/connect4") 22 int connect_v4_prog(struct bpf_sock_addr *ctx) 23 { 24 struct sockaddr_in sa = { 25 .sin_family = AF_INET, 26 .sin_addr.s_addr = bpf_htonl(0x01010101), 27 }; 28 29 __sync_fetch_and_add(&invocations_v4, 1); 30 31 if (do_bind && bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa))) 32 has_error = 1; 33 34 return 1; 35 } 36 37 SEC("cgroup/connect6") 38 int connect_v6_prog(struct bpf_sock_addr *ctx) 39 { 40 struct sockaddr_in6 sa = { 41 .sin6_family = AF_INET6, 42 .sin6_addr = BINDADDR_V6, 43 }; 44 45 __sync_fetch_and_add(&invocations_v6, 1); 46 47 if (do_bind && bpf_bind(ctx, (struct sockaddr *)&sa, sizeof(sa))) 48 has_error = 1; 49 50 return 1; 51 } 52 53 char _license[] SEC("license") = "GPL"; 54