tc.c

// SPDX-License-Identifier: GPL-2.0
#define _GNU_SOURCE
#include <sched.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <arpa/inet.h>
#include <linux/pkt_sched.h>
#include <linux/tc_act/tc_vlan.h>
#include <linux/tc_act/tc_gact.h>
#include <linux/if_ether.h>
#include <net/if.h>

#include <ynl.h>

#include <kselftest_harness.h>

#include "tc-user.h"

#define TC_HANDLE (0xFFFF << 16)

static bool tc_qdisc_print(struct __test_metadata *_metadata,
			   struct tc_getqdisc_rsp *q)
{
	bool was_fq_codel = false;
	char ifname[IF_NAMESIZE];
	const char *name;

	name = if_indextoname(q->_hdr.tcm_ifindex, ifname);
	EXPECT_TRUE((bool)name);
	ksft_print_msg("%16s: ", name ?: "no-name");

	if (q->_len.kind) {
		printf("%s  ", q->kind);

		if (q->options._present.fq_codel) {
			struct tc_fq_codel_attrs *fq_codel;
			struct tc_fq_codel_xstats *stats;

			fq_codel = &q->options.fq_codel;
			stats = q->stats2.app.fq_codel;

			EXPECT_EQ(true,
				  fq_codel->_present.limit &&
				  fq_codel->_present.target &&
				  q->stats2.app._len.fq_codel);

			if (fq_codel->_present.limit)
				printf("limit: %dp ", fq_codel->limit);
			if (fq_codel->_present.target)
				printf("target: %dms ",
				       (fq_codel->target + 500) / 1000);
			if (q->stats2.app._len.fq_codel)
				printf("new_flow_cnt: %d ",
				       stats->qdisc_stats.new_flow_count);
			was_fq_codel = true;
		}
	}
	printf("\n");

	return was_fq_codel;
}

static const char *vlan_act_name(struct tc_vlan *p)
{
	switch (p->v_action) {
	case TCA_VLAN_ACT_POP:
		return "pop";
	case TCA_VLAN_ACT_PUSH:
		return "push";
	case TCA_VLAN_ACT_MODIFY:
		return "modify";
	default:
		break;
	}

	return "not supported";
}

static const char *gact_act_name(struct tc_gact *p)
{
	switch (p->action) {
	case TC_ACT_SHOT:
		return "drop";
	case TC_ACT_OK:
		return "ok";
	case TC_ACT_PIPE:
		return "pipe";
	default:
		break;
	}

	return "not supported";
}

static void print_vlan(struct tc_act_vlan_attrs *vlan)
{
	printf("%s ", vlan_act_name(vlan->parms));
	if (vlan->_present.push_vlan_id)
		printf("id %u ", vlan->push_vlan_id);
	if (vlan->_present.push_vlan_protocol)
		printf("protocol %#x ", ntohs(vlan->push_vlan_protocol));
	if (vlan->_present.push_vlan_priority)
		printf("priority %u ", vlan->push_vlan_priority);
}

static void print_gact(struct tc_act_gact_attrs *gact)
{
	struct tc_gact *p = gact->parms;

	printf("%s ", gact_act_name(p));
}

static void flower_print(struct tc_flower_attrs *flower, const char *kind)
{
	struct tc_act_attrs *a;
	unsigned int i;

	ksft_print_msg("%s:\n", kind);

	if (flower->_present.key_vlan_id)
		ksft_print_msg("  vlan_id: %u\n", flower->key_vlan_id);
	if (flower->_present.key_vlan_prio)
		ksft_print_msg("  vlan_prio: %u\n", flower->key_vlan_prio);
	if (flower->_present.key_num_of_vlans)
		ksft_print_msg("  num_of_vlans: %u\n",
			       flower->key_num_of_vlans);

	for (i = 0; i < flower->_count.act; i++) {
		a = &flower->act[i];
		ksft_print_msg("action order: %i %s ", i + 1, a->kind);
		if (a->options._present.vlan)
			print_vlan(&a->options.vlan);
		else if (a->options._present.gact)
			print_gact(&a->options.gact);
		printf("\n");
	}
}

static void tc_filter_print(struct __test_metadata *_metadata,
			     struct tc_gettfilter_rsp *f)
{
	struct tc_options_msg *opt = &f->options;

	if (opt->_present.flower) {
		EXPECT_TRUE((bool)f->_len.kind);
		flower_print(&opt->flower, f->kind);
	} else if (f->_len.kind) {
		ksft_print_msg("%s pref %u proto: %#x\n", f->kind,
			       (f->_hdr.tcm_info >> 16),
			       ntohs(TC_H_MIN(f->_hdr.tcm_info)));
	}
}

static int tc_clsact_add(struct ynl_sock *ys, int ifi)
{
	struct tc_newqdisc_req *req;
	int ret;

	req = tc_newqdisc_req_alloc();
	if (!req)
		return -1;
	memset(req, 0, sizeof(*req));

	req->_hdr.tcm_ifindex = ifi;
	req->_hdr.tcm_parent = TC_H_CLSACT;
	req->_hdr.tcm_handle = TC_HANDLE;
	tc_newqdisc_req_set_nlflags(req,
				    NLM_F_REQUEST | NLM_F_EXCL | NLM_F_CREATE);
	tc_newqdisc_req_set_kind(req, "clsact");

	ret = tc_newqdisc(ys, req);
	tc_newqdisc_req_free(req);

	return ret;
}

static int tc_clsact_del(struct ynl_sock *ys, int ifi)
{
	struct tc_delqdisc_req *req;
	int ret;

	req = tc_delqdisc_req_alloc();
	if (!req)
		return -1;
	memset(req, 0, sizeof(*req));

	req->_hdr.tcm_ifindex = ifi;
	req->_hdr.tcm_parent = TC_H_CLSACT;
	req->_hdr.tcm_handle = TC_HANDLE;
	tc_delqdisc_req_set_nlflags(req, NLM_F_REQUEST);

	ret = tc_delqdisc(ys, req);
	tc_delqdisc_req_free(req);

	return ret;
}

static int tc_filter_add(struct ynl_sock *ys, int ifi)
{
	struct tc_newtfilter_req *req;
	struct tc_act_attrs *acts;
	struct tc_vlan p = {
		.action = TC_ACT_PIPE,
		.v_action = TCA_VLAN_ACT_PUSH
	};
	int ret;

	req = tc_newtfilter_req_alloc();
	if (!req)
		return -1;
	memset(req, 0, sizeof(*req));

	acts = tc_act_attrs_alloc(3);
	if (!acts) {
		tc_newtfilter_req_free(req);
		return -1;
	}
	memset(acts, 0, sizeof(*acts) * 3);

	req->_hdr.tcm_ifindex = ifi;
	req->_hdr.tcm_parent = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
	req->_hdr.tcm_info = TC_H_MAKE(1 << 16, htons(ETH_P_8021Q));
	req->chain = 0;

	tc_newtfilter_req_set_nlflags(req, NLM_F_REQUEST | NLM_F_EXCL | NLM_F_CREATE);
	tc_newtfilter_req_set_kind(req, "flower");
	tc_newtfilter_req_set_options_flower_key_vlan_id(req, 100);
	tc_newtfilter_req_set_options_flower_key_vlan_prio(req, 5);
	tc_newtfilter_req_set_options_flower_key_num_of_vlans(req, 3);

	__tc_newtfilter_req_set_options_flower_act(req, acts, 3);

	/* Skip action at index 0 because in TC, the action array
	 * index starts at 1, with each index defining the action's
	 * order. In contrast, in YNL indexed arrays start at index 0.
	 */
	tc_act_attrs_set_kind(&acts[1], "vlan");
	tc_act_attrs_set_options_vlan_parms(&acts[1], &p, sizeof(p));
	tc_act_attrs_set_options_vlan_push_vlan_id(&acts[1], 200);
	tc_act_attrs_set_kind(&acts[2], "vlan");
	tc_act_attrs_set_options_vlan_parms(&acts[2], &p, sizeof(p));
	tc_act_attrs_set_options_vlan_push_vlan_id(&acts[2], 300);

	tc_newtfilter_req_set_options_flower_flags(req, 0);
	tc_newtfilter_req_set_options_flower_key_eth_type(req, htons(0x8100));

	ret = tc_newtfilter(ys, req);
	tc_newtfilter_req_free(req);

	return ret;
}

static int tc_filter_del(struct ynl_sock *ys, int ifi)
{
	struct tc_deltfilter_req *req;
	int ret;

	req = tc_deltfilter_req_alloc();
	if (!req)
		return -1;
	memset(req, 0, sizeof(*req));

	req->_hdr.tcm_ifindex = ifi;
	req->_hdr.tcm_parent = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
	req->_hdr.tcm_info = TC_H_MAKE(1 << 16, htons(ETH_P_8021Q));
	tc_deltfilter_req_set_nlflags(req, NLM_F_REQUEST);

	ret = tc_deltfilter(ys, req);
	tc_deltfilter_req_free(req);

	return ret;
}

FIXTURE(tc)
{
	struct ynl_sock *ys;
	int ifindex;
};

FIXTURE_SETUP(tc)
{
	struct ynl_error yerr;
	int ret;

	ret = unshare(CLONE_NEWNET);
	ASSERT_EQ(0, ret);

	self->ifindex = 1; /* loopback */

	self->ys = ynl_sock_create(&ynl_tc_family, &yerr);
	ASSERT_NE(NULL, self->ys) {
		TH_LOG("failed to create tc socket: %s", yerr.msg);
	}
}

FIXTURE_TEARDOWN(tc)
{
	ynl_sock_destroy(self->ys);
}

TEST_F(tc, qdisc)
{
	struct tc_getqdisc_req_dump *dreq;
	struct tc_newqdisc_req *add_req;
	struct tc_delqdisc_req *del_req;
	struct tc_getqdisc_list *rsp;
	bool found = false;
	int ret;

	add_req = tc_newqdisc_req_alloc();
	ASSERT_NE(NULL, add_req);
	memset(add_req, 0, sizeof(*add_req));

	add_req->_hdr.tcm_ifindex = self->ifindex;
	add_req->_hdr.tcm_parent = TC_H_ROOT;
	tc_newqdisc_req_set_nlflags(add_req,
				    NLM_F_REQUEST | NLM_F_CREATE);
	tc_newqdisc_req_set_kind(add_req, "fq_codel");

	ret = tc_newqdisc(self->ys, add_req);
	tc_newqdisc_req_free(add_req);
	ASSERT_EQ(0, ret) {
		TH_LOG("qdisc add failed: %s", self->ys->err.msg);
	}

	dreq = tc_getqdisc_req_dump_alloc();
	ASSERT_NE(NULL, dreq);
	rsp = tc_getqdisc_dump(self->ys, dreq);
	tc_getqdisc_req_dump_free(dreq);
	ASSERT_NE(NULL, rsp) {
		TH_LOG("dump failed: %s", self->ys->err.msg);
	}
	ASSERT_FALSE(ynl_dump_empty(rsp));

	ynl_dump_foreach(rsp, qdisc) {
		found |= tc_qdisc_print(_metadata, qdisc);
	}
	tc_getqdisc_list_free(rsp);
	EXPECT_TRUE(found);

	del_req = tc_delqdisc_req_alloc();
	ASSERT_NE(NULL, del_req);
	memset(del_req, 0, sizeof(*del_req));

	del_req->_hdr.tcm_ifindex = self->ifindex;
	del_req->_hdr.tcm_parent = TC_H_ROOT;
	tc_delqdisc_req_set_nlflags(del_req, NLM_F_REQUEST);

	ret = tc_delqdisc(self->ys, del_req);
	tc_delqdisc_req_free(del_req);
	EXPECT_EQ(0, ret) {
		TH_LOG("qdisc del failed: %s", self->ys->err.msg);
	}
}

TEST_F(tc, flower)
{
	struct tc_gettfilter_req_dump *dreq;
	struct tc_gettfilter_list *rsp;
	bool found = false;
	int ret;

	ret = tc_clsact_add(self->ys, self->ifindex);
	if (ret)
		SKIP(return, "clsact not supported: %s", self->ys->err.msg);

	ret = tc_filter_add(self->ys, self->ifindex);
	ASSERT_EQ(0, ret) {
		TH_LOG("filter add failed: %s", self->ys->err.msg);
	}

	dreq = tc_gettfilter_req_dump_alloc();
	ASSERT_NE(NULL, dreq);
	memset(dreq, 0, sizeof(*dreq));
	dreq->_hdr.tcm_ifindex = self->ifindex;
	dreq->_hdr.tcm_parent = TC_H_MAKE(TC_H_CLSACT, TC_H_MIN_INGRESS);
	dreq->_present.chain = 1;
	dreq->chain = 0;

	rsp = tc_gettfilter_dump(self->ys, dreq);
	tc_gettfilter_req_dump_free(dreq);
	ASSERT_NE(NULL, rsp) {
		TH_LOG("filter dump failed: %s", self->ys->err.msg);
	}

	ynl_dump_foreach(rsp, flt) {
		tc_filter_print(_metadata, flt);
		if (flt->options._present.flower) {
			EXPECT_EQ(100, flt->options.flower.key_vlan_id);
			EXPECT_EQ(5, flt->options.flower.key_vlan_prio);
			found = true;
		}
	}
	tc_gettfilter_list_free(rsp);
	EXPECT_TRUE(found);

	ret = tc_filter_del(self->ys, self->ifindex);
	EXPECT_EQ(0, ret) {
		TH_LOG("filter del failed: %s", self->ys->err.msg);
	}

	ret = tc_clsact_del(self->ys, self->ifindex);
	EXPECT_EQ(0, ret) {
		TH_LOG("clsact del failed: %s", self->ys->err.msg);
	}
}

TEST_HARNESS_MAIN