path: root/tools/testing/selftests/net/gro.c

// SPDX-License-Identifier: GPL-2.0
/*
 * This testsuite provides conformance testing for GRO coalescing.
 *
 * Test cases:
 * 1.data
 *  Data packets of the same size and same header setup with correct
 *  sequence numbers coalesce. The one exception being the last data
 *  packet coalesced: it can be smaller than the rest and coalesced
 *  as long as it is in the same flow.
 * 2.ack
 *  Pure ACK does not coalesce.
 * 3.flags
 *  Specific test cases: no packets with PSH, SYN, URG, RST set will
 *  be coalesced.
 * 4.tcp
 *  Packets with incorrect checksum, non-consecutive seqno and
 *  different TCP header options shouldn't coalesce. Nit: given that
 *  some extension headers have paddings, such as timestamp, headers
 *  that are padding differently would not be coalesced.
 * 5.ip:
 *  Packets with different (ECN, TTL, TOS) header, ip options or
 *  ip fragments (ipv6) shouldn't coalesce.
 * 6.large:
 *  Packets larger than GRO_MAX_SIZE packets shouldn't coalesce.
 *
 * MSS is defined as 4096 - header because if it is too small
 * (i.e. 1500 MTU - header), it will result in many packets,
 * increasing the "large" test case's flakiness. This is because
 * due to time sensitivity in the coalescing window, the receiver
 * may not coalesce all of the packets.
 *
 * Note the timing issue applies to all of the test cases, so some
 * flakiness is to be expected.
 *
 */

#define _GNU_SOURCE

#include <arpa/inet.h>
#include <errno.h>
#include <error.h>
#include <getopt.h>
#include <linux/filter.h>
#include <linux/if_packet.h>
#include <linux/ipv6.h>
#include <net/ethernet.h>
#include <net/if.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <netinet/ip6.h>
#include <netinet/tcp.h>
#include <stdbool.h>
#include <stddef.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>

#include "../kselftest.h"

#define DPORT 8000
#define SPORT 1500
#define PAYLOAD_LEN 100
#define NUM_PACKETS 4
#define START_SEQ 100
#define START_ACK 100
#define ETH_P_NONE 0
#define TOTAL_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
#define MSS (4096 - sizeof(struct tcphdr) - sizeof(struct ipv6hdr))
#define MAX_PAYLOAD (IP_MAXPACKET - sizeof(struct tcphdr) - sizeof(struct ipv6hdr))
#define NUM_LARGE_PKT (MAX_PAYLOAD / MSS)
#define MAX_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
#define MIN_EXTHDR_SIZE 8
#define EXT_PAYLOAD_1 "\x00\x00\x00\x00\x00\x00"
#define EXT_PAYLOAD_2 "\x11\x11\x11\x11\x11\x11"

#define ipv6_optlen(p)  (((p)->hdrlen+1) << 3) /* calculate IPv6 extension header len */
#define BUILD_BUG_ON(condition) ((void)sizeof(char[1 - 2*!!(condition)]))

static const char *addr6_src = "fdaa::2";
static const char *addr6_dst = "fdaa::1";
static const char *addr4_src = "192.168.1.200";
static const char *addr4_dst = "192.168.1.100";
static int proto = -1;
static uint8_t src_mac[ETH_ALEN], dst_mac[ETH_ALEN];
static char *testname = "data";
static char *ifname = "eth0";
static char *smac = "aa:00:00:00:00:02";
static char *dmac = "aa:00:00:00:00:01";
static bool verbose;
static bool tx_socket = true;
static int tcp_offset = -1;
static int total_hdr_len = -1;
static int ethhdr_proto = -1;
static const int num_flush_id_cases = 6;

static void vlog(const char *fmt, ...)
{
	va_list args;

	if (verbose) {
		va_start(args, fmt);
		vfprintf(stderr, fmt, args);
		va_end(args);
	}
}

static void setup_sock_filter(int fd)
{
	const int dport_off = tcp_offset + offsetof(struct tcphdr, dest);
	const int ethproto_off = offsetof(struct ethhdr