61 lines
1.2 KiB
C
61 lines
1.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2018 Facebook
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#include <linux/bpf.h>
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#include <sys/socket.h>
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#include "bpf_helpers.h"
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#include "bpf_endian.h"
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struct bpf_map_def SEC("maps") socket_cookies = {
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.type = BPF_MAP_TYPE_HASH,
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.key_size = sizeof(__u64),
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.value_size = sizeof(__u32),
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.max_entries = 1 << 8,
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};
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SEC("cgroup/connect6")
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int set_cookie(struct bpf_sock_addr *ctx)
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{
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__u32 cookie_value = 0xFF;
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__u64 cookie_key;
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if (ctx->family != AF_INET6 || ctx->user_family != AF_INET6)
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return 1;
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cookie_key = bpf_get_socket_cookie(ctx);
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if (bpf_map_update_elem(&socket_cookies, &cookie_key, &cookie_value, 0))
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return 0;
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return 1;
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}
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SEC("sockops")
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int update_cookie(struct bpf_sock_ops *ctx)
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{
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__u32 new_cookie_value;
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__u32 *cookie_value;
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__u64 cookie_key;
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if (ctx->family != AF_INET6)
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return 1;
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if (ctx->op != BPF_SOCK_OPS_TCP_CONNECT_CB)
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return 1;
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cookie_key = bpf_get_socket_cookie(ctx);
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cookie_value = bpf_map_lookup_elem(&socket_cookies, &cookie_key);
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if (!cookie_value)
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return 1;
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new_cookie_value = (ctx->local_port << 8) | *cookie_value;
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bpf_map_update_elem(&socket_cookies, &cookie_key, &new_cookie_value, 0);
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return 1;
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}
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int _version SEC("version") = 1;
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char _license[] SEC("license") = "GPL";
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