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 int tcx_init_netns_cookie, tcx_netns_cookie; 31 int cgroup_skb_init_netns_cookie, cgroup_skb_netns_cookie; 32 33 SEC("sockops") 34 int get_netns_cookie_sockops(struct bpf_sock_ops *ctx) 35 { 36 struct bpf_sock *sk = ctx->sk; 37 int *cookie; 38 __u32 key = 0; 39 40 if (ctx->family != AF_INET6) 41 return 1; 42 43 if (!sk) 44 return 1; 45 46 switch (ctx->op) { 47 case BPF_SOCK_OPS_TCP_CONNECT_CB: 48 cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0, 49 BPF_SK_STORAGE_GET_F_CREATE); 50 if (!cookie) 51 return 1; 52 53 *cookie = bpf_get_netns_cookie(ctx); 54 break; 55 case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB: 56 bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST); 57 break; 58 default: 59 break; 60 } 61 62 return 1; 63 } 64 65 SEC("sk_msg") 66 int get_netns_cookie_sk_msg(struct sk_msg_md *msg) 67 { 68 struct bpf_sock *sk = msg->sk; 69 int *cookie; 70 71 if (msg->family != AF_INET6) 72 return 1; 73 74 if (!sk) 75 return 1; 76 77 cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0, 78 BPF_SK_STORAGE_GET_F_CREATE); 79 if (!cookie) 80 return 1; 81 82 *cookie = bpf_get_netns_cookie(msg); 83 84 return 1; 85 } 86 87 SEC("tcx/ingress") 88 int get_netns_cookie_tcx(struct __sk_buff *skb) 89 { 90 tcx_init_netns_cookie = bpf_get_netns_cookie(NULL); 91 tcx_netns_cookie = bpf_get_netns_cookie(skb); 92 return TCX_PASS; 93 } 94 95 SEC("cgroup_skb/ingress") 96 int get_netns_cookie_cgroup_skb(struct __sk_buff *skb) 97 { 98 cgroup_skb_init_netns_cookie = bpf_get_netns_cookie(NULL); 99 cgroup_skb_netns_cookie = bpf_get_netns_cookie(skb); 100 return SK_PASS; 101 } 102 103 char _license[] SEC("license") = "GPL"; 104