// SPDX-License-Identifier: GPL-2.0
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/* Copyright (c) 2020 Facebook */
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#include "bpf_iter.h"
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#include "bpf_tracing_net.h"
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#include <bpf/bpf_helpers.h>
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#include <bpf/bpf_tracing.h>
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#include <bpf/bpf_endian.h>
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char _license[] SEC("license") = "GPL";
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#define IPV6_SEQ_DGRAM_HEADER \
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" sl " \
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"local_address " \
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"remote_address " \
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"st tx_queue rx_queue tr tm->when retrnsmt" \
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" uid timeout inode ref pointer drops\n"
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static long sock_i_ino(const struct sock *sk)
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{
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const struct socket *sk_socket = sk->sk_socket;
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const struct inode *inode;
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unsigned long ino;
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if (!sk_socket)
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return 0;
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inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
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bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
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return ino;
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}
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SEC("iter/udp")
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int dump_udp6(struct bpf_iter__udp *ctx)
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{
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struct seq_file *seq = ctx->meta->seq;
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struct udp_sock *udp_sk = ctx->udp_sk;
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const struct in6_addr *dest, *src;
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struct udp6_sock *udp6_sk;
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struct inet_sock *inet;
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__u16 srcp, destp;
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__u32 seq_num;
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int rqueue;
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if (udp_sk == (void *)0)
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return 0;
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seq_num = ctx->meta->seq_num;
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if (seq_num == 0)
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BPF_SEQ_PRINTF(seq, IPV6_SEQ_DGRAM_HEADER);
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udp6_sk = bpf_skc_to_udp6_sock(udp_sk);
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if (udp6_sk == (void *)0)
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return 0;
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inet = &udp_sk->inet;
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srcp = bpf_ntohs(inet->inet_sport);
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destp = bpf_ntohs(inet->inet_dport);
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rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
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dest = &inet->sk.sk_v6_daddr;
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src = &inet->sk.sk_v6_rcv_saddr;
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BPF_SEQ_PRINTF(seq, "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X ",
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ctx->bucket,
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src->s6_addr32[0], src->s6_addr32[1],
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src->s6_addr32[2], src->s6_addr32[3], srcp,
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dest->s6_addr32[0], dest->s6_addr32[1],
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dest->s6_addr32[2], dest->s6_addr32[3], destp);
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BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
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inet->sk.sk_state,
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inet->sk.sk_wmem_alloc.refs.counter - 1,
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rqueue,
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0, 0L, 0, ctx->uid, 0,
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sock_i_ino(&inet->sk),
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inet->sk.sk_refcnt.refs.counter, udp_sk,
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inet->sk.sk_drops.counter);
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return 0;
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}
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