tools/testing/selftests/bpf/progs/bpf_iter_udp4.c

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