LXR linux/tools/testing/selftests/bpf/progs/bpf_iter

   1// SPDX-License-Identifier: GPL-2.0
   2/* Copyright Amazon.com Inc. or its affiliates. */
   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/unix")
  25int dump_unix(struct bpf_iter__unix *ctx)
  26{
  27        struct unix_sock *unix_sk = ctx->unix_sk;
  28        struct sock *sk = (struct sock *)unix_sk;
  29        struct seq_file *seq;
  30        __u32 seq_num;
  31
  32        if (!unix_sk)
  33                return 0;
  34
  35        seq = ctx->meta->seq;
  36        seq_num = ctx->meta->seq_num;
  37        if (seq_num == 0)
  38                BPF_SEQ_PRINTF(seq, "Num               RefCount Protocol Flags    Type St    Inode Path\n");
  39
  40        BPF_SEQ_PRINTF(seq, "%pK: %08X %08X %08X %04X %02X %8lu",
  41                       unix_sk,
  42                       sk->sk_refcnt.refs.counter,
  43                       0,
  44                       sk->sk_state == TCP_LISTEN ? __SO_ACCEPTCON : 0,
  45                       sk->sk_type,
  46                       sk->sk_socket ?
  47                       (sk->sk_state == TCP_ESTABLISHED ? SS_CONNECTED : SS_UNCONNECTED) :
  48                       (sk->sk_state == TCP_ESTABLISHED ? SS_CONNECTING : SS_DISCONNECTING),
  49                       sock_i_ino(sk));
  50
  51        if (unix_sk->addr) {
  52                if (!UNIX_ABSTRACT(unix_sk)) {
  53                        BPF_SEQ_PRINTF(seq, " %s", unix_sk->addr->name->sun_path);
  54                } else {
  55                        /* The name of the abstract UNIX domain socket starts
  56                         * with '\0' and can contain '\0'.  The null bytes
  57                         * should be escaped as done in unix_seq_show().
  58                         */
  59                        __u64 i, len;
  60
  61                        len = unix_sk->addr->len - sizeof(short);
  62
  63                        BPF_SEQ_PRINTF(seq, " @");
  64
  65                        for (i = 1; i < len; i++) {
  66                                /* unix_mkname() tests this upper bound. */
  67                                if (i >= sizeof(struct sockaddr_un))
  68                                        break;
  69
  70                                BPF_SEQ_PRINTF(seq, "%c",
  71                                               unix_sk->addr->name->sun_path[i] ?:
  72                                               '@');
  73                        }
  74                }
  75        }
  76
  77        BPF_SEQ_PRINTF(seq, "\n");
  78
  79        return 0;
  80}
  81