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