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selftests/bpf: Implement sample udp/udp6 bpf_iter programs

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On my VM, I got identical results between /proc/net/udp[6] and
the udp{4,6} bpf iterator.

For udp6:
  $ cat /sys/fs/bpf/p1
    sl  local_address                         remote_address                        st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
   1405: 000080FE00000000FF7CC4D0D9EFE4FE:0222 00000000000000000000000000000000:0000 07 00000000:00000000 00:00000000 00000000   193        0 19183 2 0000000029eab111 0
  $ cat /proc/net/udp6
    sl  local_address                         remote_address                        st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
   1405: 000080FE00000000FF7CC4D0D9EFE4FE:0222 00000000000000000000000000000000:0000 07 00000000:00000000 00:00000000 00000000   193        0 19183 2 0000000029eab111 0

For udp4:
  $ cat /sys/fs/bpf/p4
    sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
   2007: 00000000:1F90 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 72540 2 000000004ede477a 0
  $ cat /proc/net/udp
    sl  local_address rem_address   st tx_queue rx_queue tr tm->when retrnsmt   uid  timeout inode ref pointer drops
   2007: 00000000:1F90 00000000:0000 07 00000000:00000000 00:00000000 00000000     0        0 72540 2 000000004ede477a 0

Signed-off-by: Yonghong Song <yhs@fb.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Acked-by: Andrii Nakryiko <andriin@fb.com>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20200623230822.3989299-1-yhs@fb.com
This commit is contained in:
Yonghong Song 2020-06-23 16:08:22 -07:00 committed by Alexei Starovoitov
parent 2767c97765
commit ace6d6ec9e
3 changed files with 166 additions and 0 deletions
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16
tools/testing/selftests/bpf/progs/bpf_iter.h
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@ -9,6 +9,8 @@
#define bpf_iter__task_file bpf_iter__task_file___not_used
#define bpf_iter__tcp bpf_iter__tcp___not_used
#define tcp6_sock tcp6_sock___not_used
#define bpf_iter__udp bpf_iter__udp___not_used
#define udp6_sock udp6_sock___not_used
#include "vmlinux.h"
#undef bpf_iter_meta
#undef bpf_iter__bpf_map
@ -18,6 +20,8 @@
#undef bpf_iter__task_file
#undef bpf_iter__tcp
#undef tcp6_sock
#undef bpf_iter__udp
#undef udp6_sock
struct bpf_iter_meta {
struct seq_file *seq;
@ -62,3 +66,15 @@ struct tcp6_sock {
struct tcp_sock tcp;
struct ipv6_pinfo inet6;
} __attribute__((preserve_access_index));
struct bpf_iter__udp {
struct bpf_iter_meta *meta;
struct udp_sock *udp_sk;
uid_t uid __attribute__((aligned(8)));
int bucket __attribute__((aligned(8)));
} __attribute__((preserve_access_index));
struct udp6_sock {
struct udp_sock udp;
struct ipv6_pinfo inet6;
} __attribute__((preserve_access_index));

71
tools/testing/selftests/bpf/progs/bpf_iter_udp4.c Normal file
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@ -0,0 +1,71 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "bpf_iter.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_endian.h>
char _license[] SEC("license") = "GPL";
static long sock_i_ino(const struct sock *sk)
{
const struct socket *sk_socket = sk->sk_socket;
const struct inode *inode;
unsigned long ino;
if (!sk_socket)
return 0;
inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
bpf_probe_read(&ino, sizeof(ino), &inode->i_ino);
return ino;
}
SEC("iter/udp")
int dump_udp4(struct bpf_iter__udp *ctx)
{
struct seq_file *seq = ctx->meta->seq;
struct udp_sock *udp_sk = ctx->udp_sk;
struct inet_sock *inet;
__u16 srcp, destp;
__be32 dest, src;
__u32 seq_num;
int rqueue;
if (udp_sk == (void *)0)
return 0;
seq_num = ctx->meta->seq_num;
if (seq_num == 0)
BPF_SEQ_PRINTF(seq,
" sl local_address rem_address st tx_queue "
"rx_queue tr tm->when retrnsmt uid timeout "
"inode ref pointer drops\n");
/* filter out udp6 sockets */
inet = &udp_sk->inet;
if (inet->sk.sk_family == AF_INET6)
return 0;
inet = &udp_sk->inet;
dest = inet->inet_daddr;
src = inet->inet_rcv_saddr;
srcp = bpf_ntohs(inet->inet_sport);
destp = bpf_ntohs(inet->inet_dport);
rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
BPF_SEQ_PRINTF(seq, "%5d: %08X:%04X %08X:%04X ",
ctx->bucket, src, srcp, dest, destp);
BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
inet->sk.sk_state,
inet->sk.sk_wmem_alloc.refs.counter - 1,
rqueue,
0, 0L, 0, ctx->uid, 0,
sock_i_ino(&inet->sk),
inet->sk.sk_refcnt.refs.counter, udp_sk,
inet->sk.sk_drops.counter);
return 0;
}

79
tools/testing/selftests/bpf/progs/bpf_iter_udp6.c Normal file
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@ -0,0 +1,79 @@
// SPDX-License-Identifier: GPL-2.0
/* Copyright (c) 2020 Facebook */
#include "bpf_iter.h"
#include "bpf_tracing_net.h"
#include <bpf/bpf_helpers.h>
#include <bpf/bpf_tracing.h>
#include <bpf/bpf_endian.h>
char _license[] SEC("license") = "GPL";
#define IPV6_SEQ_DGRAM_HEADER \
" sl " \
"local_address " \
"remote_address " \
"st tx_queue rx_queue tr tm->when retrnsmt" \
" uid timeout inode ref pointer drops\n"
static long sock_i_ino(const struct sock *sk)
{
const struct socket *sk_socket = sk->sk_socket;
const struct inode *inode;
unsigned long ino;
if (!sk_socket)
return 0;
inode = &container_of(sk_socket, struct socket_alloc, socket)->vfs_inode;
bpf_probe_read(&ino, sizeof(ino), &inode->i_ino);
return ino;
}
SEC("iter/udp")
int dump_udp6(struct bpf_iter__udp *ctx)
{
struct seq_file *seq = ctx->meta->seq;
struct udp_sock *udp_sk = ctx->udp_sk;
const struct in6_addr *dest, *src;
struct udp6_sock *udp6_sk;
struct inet_sock *inet;
__u16 srcp, destp;
__u32 seq_num;
int rqueue;
if (udp_sk == (void *)0)
return 0;
seq_num = ctx->meta->seq_num;
if (seq_num == 0)
BPF_SEQ_PRINTF(seq, IPV6_SEQ_DGRAM_HEADER);
udp6_sk = bpf_skc_to_udp6_sock(udp_sk);
if (udp6_sk == (void *)0)
return 0;
inet = &udp_sk->inet;
srcp = bpf_ntohs(inet->inet_sport);
destp = bpf_ntohs(inet->inet_dport);
rqueue = inet->sk.sk_rmem_alloc.counter - udp_sk->forward_deficit;
dest = &inet->sk.sk_v6_daddr;
src = &inet->sk.sk_v6_rcv_saddr;
BPF_SEQ_PRINTF(seq, "%5d: %08X%08X%08X%08X:%04X %08X%08X%08X%08X:%04X ",
ctx->bucket,
src->s6_addr32[0], src->s6_addr32[1],
src->s6_addr32[2], src->s6_addr32[3], srcp,
dest->s6_addr32[0], dest->s6_addr32[1],
dest->s6_addr32[2], dest->s6_addr32[3], destp);
BPF_SEQ_PRINTF(seq, "%02X %08X:%08X %02X:%08lX %08X %5u %8d %lu %d %pK %u\n",
inet->sk.sk_state,
inet->sk.sk_wmem_alloc.refs.counter - 1,
rqueue,
0, 0L, 0, ctx->uid, 0,
sock_i_ino(&inet->sk),
inet->sk.sk_refcnt.refs.counter, udp_sk,
inet->sk.sk_drops.counter);
return 0;
}