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_tracing.h>
7 #include <bpf/bpf_endian.h>
8
9 char _license[] SEC("license") = "GPL";
10
11 #define IPV6_SEQ_DGRAM_HEADER \
12 " sl " \
13 "local_address " \
14 "remote_address " \
15 "st tx_queue rx_queue tr tm->when retrnsmt" \
16 " uid timeout inode ref pointer drops\n"
17
sock_i_ino(const struct sock * sk)18 static long sock_i_ino(const struct sock *sk)
19 {
20 const struct socket *sk_socket = sk->sk_socket;
21 const struct inode *inode;
22 unsigned long ino;
23
24 if (!sk_socket)
25 return 0;
26
27 inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
28 bpf_probe_read_kernel(&ino, sizeof(ino), &inode->i_ino);
29 return ino;
30 }
31
32 SEC("iter/udp")
dump_udp6(struct bpf_iter__udp * ctx)33 int dump_udp6(struct bpf_iter__udp *ctx)
34 {
35 struct seq_file *seq = ctx->meta->seq;
36 struct udp_sock *udp_sk = ctx->udp_sk;
37 const struct in6_addr *dest, *src;
38 struct udp6_sock *udp6_sk;
39 struct inet_sock *inet;
40 __u16 srcp, destp;
41 __u32 seq_num;
42 int rqueue;
43
44 if (udp_sk == (void *)0)
45 return 0;
46
47 seq_num = ctx->meta->seq_num;
48 if (seq_num == 0)
49 BPF_SEQ_PRINTF(seq, IPV6_SEQ_DGRAM_HEADER);
50
51 udp6_sk = bpf_skc_to_udp6_sock(udp_sk);
52 if (udp6_sk == (void *)0)
53 return 0;
54
55 inet = &udp_sk->inet;
56 srcp = bpf_ntohs(inet->inet_sport);
57 destp = bpf_ntohs(inet->inet_dport);
58 rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
59 dest = &inet->sk.sk_v6_daddr;
60 src = &inet->sk.sk_v6_rcv_saddr;
61
62 BPF_SEQ_PRINTF(seq, "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X ",
63 ctx->bucket,
64 src->s6_addr32[0], src->s6_addr32[1],
65 src->s6_addr32[2], src->s6_addr32[3], srcp,
66 dest->s6_addr32[0], dest->s6_addr32[1],
67 dest->s6_addr32[2], dest->s6_addr32[3], destp);
68
69 BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
70 inet->sk.sk_state,
71 inet->sk.sk_wmem_alloc.refs.counter - 1,
72 rqueue,
73 0, 0L, 0, ctx->uid, 0,
74 sock_i_ino(&inet->sk),
75 inet->sk.sk_refcnt.refs.counter, udp_sk,
76 inet->sk.sk_drops.counter);
77
78 return 0;
79 }
80