85 lines
1.5 KiB
C
85 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#define AF_INET6 10
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struct {
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__uint(type, BPF_MAP_TYPE_SK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, int);
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} sockops_netns_cookies SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SK_STORAGE);
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__uint(map_flags, BPF_F_NO_PREALLOC);
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__type(key, int);
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__type(value, int);
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} sk_msg_netns_cookies SEC(".maps");
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struct {
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__uint(type, BPF_MAP_TYPE_SOCKMAP);
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__uint(max_entries, 2);
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__type(key, __u32);
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__type(value, __u64);
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} sock_map SEC(".maps");
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SEC("sockops")
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int get_netns_cookie_sockops(struct bpf_sock_ops *ctx)
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{
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struct bpf_sock *sk = ctx->sk;
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int *cookie;
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__u32 key = 0;
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if (ctx->family != AF_INET6)
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return 1;
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if (!sk)
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return 1;
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switch (ctx->op) {
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case BPF_SOCK_OPS_TCP_CONNECT_CB:
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cookie = bpf_sk_storage_get(&sockops_netns_cookies, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!cookie)
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return 1;
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*cookie = bpf_get_netns_cookie(ctx);
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break;
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case BPF_SOCK_OPS_ACTIVE_ESTABLISHED_CB:
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bpf_sock_map_update(ctx, &sock_map, &key, BPF_NOEXIST);
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break;
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default:
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break;
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}
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return 1;
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}
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SEC("sk_msg")
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int get_netns_cookie_sk_msg(struct sk_msg_md *msg)
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{
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struct bpf_sock *sk = msg->sk;
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int *cookie;
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if (msg->family != AF_INET6)
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return 1;
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if (!sk)
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return 1;
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cookie = bpf_sk_storage_get(&sk_msg_netns_cookies, sk, 0,
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BPF_SK_STORAGE_GET_F_CREATE);
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if (!cookie)
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return 1;
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*cookie = bpf_get_netns_cookie(msg);
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return 1;
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}
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char _license[] SEC("license") = "GPL";
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