92 lines
2.0 KiB
C
92 lines
2.0 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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// Copyright (c) 2024 Meta
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#include "vmlinux.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_core_read.h>
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#include <bpf/bpf_endian.h>
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#include "bpf_tracing_net.h"
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#include "bpf_kfuncs.h"
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#define ATTR __always_inline
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#include "test_jhash.h"
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static bool ipv6_addr_loopback(const struct in6_addr *a)
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{
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return (a->s6_addr32[0] | a->s6_addr32[1] |
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a->s6_addr32[2] | (a->s6_addr32[3] ^ bpf_htonl(1))) == 0;
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}
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volatile const __u16 ports[2];
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unsigned int bucket[2];
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SEC("iter/tcp")
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int iter_tcp_soreuse(struct bpf_iter__tcp *ctx)
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{
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struct sock *sk = (struct sock *)ctx->sk_common;
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struct inet_hashinfo *hinfo;
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unsigned int hash;
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struct net *net;
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int idx;
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if (!sk)
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return 0;
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sk = bpf_core_cast(sk, struct sock);
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if (sk->sk_family != AF_INET6 ||
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sk->sk_state != TCP_LISTEN ||
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!ipv6_addr_loopback(&sk->sk_v6_rcv_saddr))
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return 0;
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if (sk->sk_num == ports[0])
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idx = 0;
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else if (sk->sk_num == ports[1])
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idx = 1;
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else
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return 0;
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/* bucket selection as in inet_lhash2_bucket_sk() */
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net = sk->sk_net.net;
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hash = jhash2(sk->sk_v6_rcv_saddr.s6_addr32, 4, net->hash_mix);
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hash ^= sk->sk_num;
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hinfo = net->ipv4.tcp_death_row.hashinfo;
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bucket[idx] = hash & hinfo->lhash2_mask;
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bpf_seq_write(ctx->meta->seq, &idx, sizeof(idx));
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return 0;
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}
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#define udp_sk(ptr) container_of(ptr, struct udp_sock, inet.sk)
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SEC("iter/udp")
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int iter_udp_soreuse(struct bpf_iter__udp *ctx)
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{
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struct sock *sk = (struct sock *)ctx->udp_sk;
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struct udp_table *udptable;
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int idx;
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if (!sk)
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return 0;
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sk = bpf_core_cast(sk, struct sock);
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if (sk->sk_family != AF_INET6 ||
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!ipv6_addr_loopback(&sk->sk_v6_rcv_saddr))
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return 0;
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if (sk->sk_num == ports[0])
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idx = 0;
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else if (sk->sk_num == ports[1])
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idx = 1;
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else
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return 0;
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/* bucket selection as in udp_hashslot2() */
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udptable = sk->sk_net.net->ipv4.udp_table;
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bucket[idx] = udp_sk(sk)->udp_portaddr_hash & udptable->mask;
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bpf_seq_write(ctx->meta->seq, &idx, sizeof(idx));
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return 0;
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}
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char _license[] SEC("license") = "GPL";
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