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 static long sock_i_ino(const struct sock *sk)
11 {
12 const struct socket *sk_socket = sk->sk_socket;
13 const struct inode *inode;
14 unsigned long ino;
15
16 if (!sk_socket)
17 return 0;
18
19 inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
20 bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
21 return ino;
22 }
23
24 SEC("iter/udp")
25 int dump_udp4(struct bpf_iter__udp *ctx)
26 {
27 struct seq_file *seq = ctx->meta->seq;
28 struct udp_sock *udp_sk = ctx->udp_sk;
29 struct inet_sock *inet;
30 __u16 srcp, destp;
31 __be32 dest, src;
32 __u32 seq_num;
33 int rqueue;
34
35 if (udp_sk == (void *)0)
36 return 0;
37
38 seq_num = ctx->meta->seq_num;
39 if (seq_num == 0)
40 BPF_SEQ_PRINTF(seq,
41 " sl local_address rem_address st tx_queue "
42 "rx_queue tr tm->when retrnsmt uid timeout "
43 "inode ref pointer drops\n");
44
45 /* filter out udp6 sockets */
46 inet = &udp_sk->inet;
47 if (inet->sk.sk_family == AF_INET6)
48 return 0;
49
50 inet = &udp_sk->inet;
51 dest = inet->inet_daddr;
52 src = inet->inet_rcv_saddr;
53 srcp = bpf_ntohs(inet->inet_sport);
54 destp = bpf_ntohs(inet->inet_dport);
55 rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
56
57 BPF_SEQ_PRINTF(seq, "%5d: %08X:%04X %08X:%04X ",
58 ctx->bucket, src, srcp, dest, destp);
59
60 BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
61 inet->sk.sk_state,
62 inet->sk.sk_wmem_alloc.refs.counter - 1,
63 rqueue,
64 0, 0L, 0, ctx->uid, 0,
65 sock_i_ino(&inet->sk),
66 inet->sk.sk_refcnt.refs.counter, udp_sk,
67 inet->sk.sk_drops.counter);
68
69 return 0;
70 }
71
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