1 // SPDX-License-Identifier: GPL-2.0
2 /* Copyright (c) 2020 Facebook */
3 #include "bpf_iter.h"
4 #include "bpf_tracing_net.h"
5 #include <bpf/bpf_helpers.h>
6 #include <bpf/bpf_endian.h>
7 
8 char _license[] SEC("license") = "GPL";
9 
10 #define IPV6_SEQ_DGRAM_HEADER				\
11 	"  sl  "					\
12 	"local_address                         "	\
13 	"remote_address                        "	\
14 	"st tx_queue rx_queue tr tm->when retrnsmt"	\
15 	"   uid  timeout inode ref pointer drops\n"
16 
17 static long sock_i_ino(const struct sock *sk)
18 {
19 	const struct socket *sk_socket = sk->sk_socket;
20 	const struct inode *inode;
21 	unsigned long ino;
22 
23 	if (!sk_socket)
24 		return 0;
25 
26 	inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
27 	bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
28 	return ino;
29 }
30 
31 SEC("iter/udp")
32 int dump_udp6(struct bpf_iter__udp *ctx)
33 {
34 	struct seq_file *seq = ctx->meta->seq;
35 	struct udp_sock *udp_sk = ctx->udp_sk;
36 	const struct in6_addr *dest, *src;
37 	struct udp6_sock *udp6_sk;
38 	struct inet_sock *inet;
39 	__u16 srcp, destp;
40 	__u32 seq_num;
41 	int rqueue;
42 
43 	if (udp_sk == (void *)0)
44 		return 0;
45 
46 	seq_num = ctx->meta->seq_num;
47 	if (seq_num == 0)
48 		BPF_SEQ_PRINTF(seq, IPV6_SEQ_DGRAM_HEADER);
49 
50 	udp6_sk = bpf_skc_to_udp6_sock(udp_sk);
51 	if (udp6_sk == (void *)0)
52 		return 0;
53 
54 	inet = &udp_sk->inet;
55 	srcp = bpf_ntohs(inet->inet_sport);
56 	destp = bpf_ntohs(inet->inet_dport);
57 	rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
58 	dest  = &inet->sk.sk_v6_daddr;
59 	src   = &inet->sk.sk_v6_rcv_saddr;
60 
61 	BPF_SEQ_PRINTF(seq, "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X ",
62 		       ctx->bucket,
63 		       src->s6_addr32[0], src->s6_addr32[1],
64 		       src->s6_addr32[2], src->s6_addr32[3], srcp,
65 		       dest->s6_addr32[0], dest->s6_addr32[1],
66 		       dest->s6_addr32[2], dest->s6_addr32[3], destp);
67 
68 	BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
69 		       inet->sk.sk_state,
70 		       inet->sk.sk_wmem_alloc.refs.counter - 1,
71 		       rqueue,
72 		       0, 0L, 0, ctx->uid, 0,
73 		       sock_i_ino(&inet->sk),
74 		       inet->sk.sk_refcnt.refs.counter, udp_sk,
75 		       inet->sk.sk_drops.counter);
76 
77 	return 0;
78 }
79