bpf_iter_udp4.c (1810B)
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 8char _license[] SEC("license") = "GPL"; 9 10static 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 24SEC("iter/udp") 25int 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}