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
sock_i_ino(const struct sock * sk)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")
dump_udp6(struct bpf_iter__udp * ctx)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