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