1 // SPDX-License-Identifier: GPL-2.0 2 3 #include "vmlinux.h" 4 5 #include <bpf/bpf_helpers.h> 6 7 #define AF_INET6 10 8 9 struct { 10 __uint(type, BPF_MAP_TYPE_SK_STORAGE); 11 __uint(map_flags, BPF_F_NO_PREALLOC); 12 __type(key, int); 13 __type(value, int); 14 } sockops_netns_cookies SEC(".maps"); 15 16 struct { 17 __uint(type, BPF_MAP_TYPE_SK_STORAGE); 18 __uint(map_flags, BPF_F_NO_PREALLOC); 19 __type(key, int); 20 __type(value, int); 21 } sk_msg_netns_cookies SEC(".maps"); 22 23 struct { 24 __uint(type, BPF_MAP_TYPE_SOCKMAP); 25 __uint(max_entries, 2); 26 __type(key, __u32); 27 __type(value, __u64); 28 } sock_map SEC(".maps"); 29 30 SEC("sockops") 31 int get_netns_cookie_sockops(struct bpf_sock_ops *ctx) 32 { 33 struct bpf_sock *sk = ctx->sk; 34 int *cookie; 35 __u32 key = 0; 36 37 if (ctx->family != AF_INET6) 38 return 1; 39 40 if (!sk) 41 return 1; 42 43 switch (ctx->op) { 44 case BPF_SOCK_OPS_TCP_CONNECT_CB: 45 cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0, 46 BPF_SK_STORAGE_GET_F_CREATE); 47 if (!cookie) 48 return 1; 49 50 *cookie = bpf_get_netns_cookie(ctx); 51 break; 52 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: 53 bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST); 54 break; 55 default: 56 break; 57 } 58 59 return 1; 60 } 61 62 SEC("sk_msg") 63 int get_netns_cookie_sk_msg(struct sk_msg_md *msg) 64 { 65 struct bpf_sock *sk = msg->sk; 66 int *cookie; 67 68 if (msg->family != AF_INET6) 69 return 1; 70 71 if (!sk) 72 return 1; 73 74 cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0, 75 BPF_SK_STORAGE_GET_F_CREATE); 76 if (!cookie) 77 return 1; 78 79 *cookie = bpf_get_netns_cookie(msg); 80 81 return 1; 82 } 83 84 char _license[] SEC("license") = "GPL"; 85