Quelle  bpf_qdisc.c   Sprache: C

// SPDX-License-Identifier: GPL-2.0

#include <linux/pkt_sched.h>
#include <linux/rtnetlink.h>
#include <test_progs.h>

#include "network_helpers.h"
#include "bpf_qdisc_fifo.skel.h"
#include "bpf_qdisc_fq.skel.h"
#include "bpf_qdisc_fail__incompl_ops.skel.h"

#define LO_IFINDEX 1

static const unsigned int total_bytes = 10 * 1024 * 1024;

static void do_test(char *qdisc)
{
 DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook, .ifindex = LO_IFINDEX,
       .attach_point = BPF_TC_QDISC,
       .parent = TC_H_ROOT,
       .handle = 0x8000000,
       .qdisc = qdisc);
 int srv_fd = -1, cli_fd = -1;
 int err;

 err = bpf_tc_hook_create(&hook);
 if (!ASSERT_OK(err, "attach qdisc"))
  return;

 srv_fd = start_server(AF_INET6, SOCK_STREAM, NULL, 0, 0);
 if (!ASSERT_OK_FD(srv_fd, "start server"))
  goto done;

 cli_fd = connect_to_fd(srv_fd, 0);
 if (!ASSERT_OK_FD(cli_fd, "connect to client"))
  goto done;

 err = send_recv_data(srv_fd, cli_fd, total_bytes);
 ASSERT_OK(err, "send_recv_data");

done:
 if (srv_fd != -1)
  close(srv_fd);
 if (cli_fd != -1)
  close(cli_fd);

 bpf_tc_hook_destroy(&hook);
}

static void test_fifo(void)
{
 struct bpf_qdisc_fifo *fifo_skel;

 fifo_skel = bpf_qdisc_fifo__open_and_load();
 if (!ASSERT_OK_PTR(fifo_skel, "bpf_qdisc_fifo__open_and_load"))
  return;

 if (!ASSERT_OK(bpf_qdisc_fifo__attach(fifo_skel), "bpf_qdisc_fifo__attach"))
  goto out;

 do_test("bpf_fifo");
out:
 bpf_qdisc_fifo__destroy(fifo_skel);
}

static void test_fq(void)
{
 struct bpf_qdisc_fq *fq_skel;

 fq_skel = bpf_qdisc_fq__open_and_load();
 if (!ASSERT_OK_PTR(fq_skel, "bpf_qdisc_fq__open_and_load"))
  return;

 if (!ASSERT_OK(bpf_qdisc_fq__attach(fq_skel), "bpf_qdisc_fq__attach"))
  goto out;

 do_test("bpf_fq");
out:
 bpf_qdisc_fq__destroy(fq_skel);
}

static void test_qdisc_attach_to_mq(void)
{
 DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook,
       .attach_point = BPF_TC_QDISC,
       .parent = TC_H_MAKE(1 << 16, 1),
       .handle = 0x11 << 16,
       .qdisc = "bpf_fifo");
 struct bpf_qdisc_fifo *fifo_skel;
 int err;

 fifo_skel = bpf_qdisc_fifo__open_and_load();
 if (!ASSERT_OK_PTR(fifo_skel, "bpf_qdisc_fifo__open_and_load"))
  return;

 if (!ASSERT_OK(bpf_qdisc_fifo__attach(fifo_skel), "bpf_qdisc_fifo__attach"))
  goto out;

 SYS(out, "ip link add veth0 type veth peer veth1");
 hook.ifindex = if_nametoindex("veth0");
 SYS(out, "tc qdisc add dev veth0 root handle 1: mq");

 err = bpf_tc_hook_create(&hook);
 ASSERT_OK(err, "attach qdisc");

 bpf_tc_hook_destroy(&hook);

 SYS(out, "tc qdisc delete dev veth0 root mq");
out:
 bpf_qdisc_fifo__destroy(fifo_skel);
}

static void test_qdisc_attach_to_non_root(void)
{
 DECLARE_LIBBPF_OPTS(bpf_tc_hook, hook, .ifindex = LO_IFINDEX,
       .attach_point = BPF_TC_QDISC,
       .parent = TC_H_MAKE(1 << 16, 1),
       .handle = 0x11 << 16,
       .qdisc = "bpf_fifo");
 struct bpf_qdisc_fifo *fifo_skel;
 int err;

 fifo_skel = bpf_qdisc_fifo__open_and_load();
 if (!ASSERT_OK_PTR(fifo_skel, "bpf_qdisc_fifo__open_and_load"))
  return;

 if (!ASSERT_OK(bpf_qdisc_fifo__attach(fifo_skel), "bpf_qdisc_fifo__attach"))
  goto out;

 SYS(out, "tc qdisc add dev lo root handle 1: htb");
 SYS(out_del_htb, "tc class add dev lo parent 1: classid 1:1 htb rate 75Kbit");

 err = bpf_tc_hook_create(&hook);
 if (!ASSERT_ERR(err, "attach qdisc"))
  bpf_tc_hook_destroy(&hook);

out_del_htb:
 SYS(out, "tc qdisc delete dev lo root htb");
out:
 bpf_qdisc_fifo__destroy(fifo_skel);
}

static void test_incompl_ops(void)
{
 struct bpf_qdisc_fail__incompl_ops *skel;
 struct bpf_link *link;

 skel = bpf_qdisc_fail__incompl_ops__open_and_load();
 if (!ASSERT_OK_PTR(skel, "bpf_qdisc_fifo__open_and_load"))
  return;

 link = bpf_map__attach_struct_ops(skel->maps.test);
 if (!ASSERT_ERR_PTR(link, "bpf_map__attach_struct_ops"))
  bpf_link__destroy(link);

 bpf_qdisc_fail__incompl_ops__destroy(skel);
}

static int get_default_qdisc(char *qdisc_name)
{
 FILE *f;
 int num;

 f = fopen("/proc/sys/net/core/default_qdisc", "r");
 if (!f)
  return -errno;

 num = fscanf(f, "%s", qdisc_name);
 fclose(f);

 return num == 1 ? 0 : -EFAULT;
}

static void test_default_qdisc_attach_to_mq(void)
{
 char default_qdisc[IFNAMSIZ] = {};
 struct bpf_qdisc_fifo *fifo_skel;
 struct netns_obj *netns = NULL;
 int err;

 fifo_skel = bpf_qdisc_fifo__open_and_load();
 if (!ASSERT_OK_PTR(fifo_skel, "bpf_qdisc_fifo__open_and_load"))
  return;

 if (!ASSERT_OK(bpf_qdisc_fifo__attach(fifo_skel), "bpf_qdisc_fifo__attach"))
  goto out;

 err = get_default_qdisc(default_qdisc);
 if (!ASSERT_OK(err, "read sysctl net.core.default_qdisc"))
  goto out;

 err = write_sysctl("/proc/sys/net/core/default_qdisc", "bpf_fifo");
 if (!ASSERT_OK(err, "write sysctl net.core.default_qdisc"))
  goto out;

 netns = netns_new("bpf_qdisc_ns", true);
 if (!ASSERT_OK_PTR(netns, "netns_new"))
  goto out;

 SYS(out, "ip link add veth0 type veth peer veth1");
 SYS(out, "tc qdisc add dev veth0 root handle 1: mq");

 ASSERT_EQ(fifo_skel->bss->init_called, true, "init_called");

 SYS(out, "tc qdisc delete dev veth0 root mq");
out:
 netns_free(netns);
 if (default_qdisc[0])
  write_sysctl("/proc/sys/net/core/default_qdisc", default_qdisc);

 bpf_qdisc_fifo__destroy(fifo_skel);
}

void test_ns_bpf_qdisc(void)
{
 if (test__start_subtest("fifo"))
  test_fifo();
 if (test__start_subtest("fq"))
  test_fq();
 if (test__start_subtest("attach to mq"))
  test_qdisc_attach_to_mq();
 if (test__start_subtest("attach to non root"))
  test_qdisc_attach_to_non_root();
 if (test__start_subtest("incompl_ops"))
  test_incompl_ops();
}

void serial_test_bpf_qdisc_default(void)
{
 test_default_qdisc_attach_to_mq();
}