// 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, h_proto);
int optlen = 0;
int ipproto_off, opt_ipproto_off;
int next_off;
if (proto == PF_INET)
next_off = offsetof(struct iphdr, protocol);
else
next_off = offsetof(struct ipv6hdr, nexthdr);
ipproto_off = ETH_HLEN + next_off;
/* Overridden later if exthdrs are used: */
opt_ipproto_off = ipproto_off;
if (strcmp(testname, "ip") == 0) {
if (proto == PF_INET)
optlen = sizeof(struct ip_timestamp);
else {
BUILD_BUG_ON(sizeof(struct ip6_hbh) > MIN_EXTHDR_SIZE);
BUILD_BUG_ON(sizeof(struct ip6_dest) > MIN_EXTHDR_SIZE);
BUILD_BUG_ON(sizeof(struct ip6_frag) > MIN_EXTHDR_SIZE);
/* same size for HBH and Fragment extension header types */
optlen = MIN_EXTHDR_SIZE;
opt_ipproto_off = ETH_HLEN + sizeof(struct ipv6hdr)
+ offsetof(struct ip6_ext, ip6e_nxt);
}
}
/* this filter validates the following:
* - packet is IPv4/IPv6 according to the running test.
* - packet is TCP. Also handles the case of one extension header and then TCP.
* - checks the packet tcp dport equals to DPORT. Also handles the case of one
* extension header and then TCP.
*/
struct sock_filter filter[] = {
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, ethproto_off),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ntohs(ethhdr_proto), 0, 9),
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ipproto_off),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_TCP, 2, 0),
BPF_STMT(BPF_LD + BPF_B + BPF_ABS, opt_ipproto_off),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_TCP, 0, 5),
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, dport_off),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DPORT, 2, 0),
BPF_STMT(BPF_LD + BPF_H + BPF_ABS, dport_off + optlen),
BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DPORT, 0, 1),
BPF_STMT(BPF_RET + BPF_K, 0xFFFFFFFF),
BPF_STMT(BPF_RET + BPF_K, 0),
};
struct sock_fprog bpf = {
.len = ARRAY_SIZE(filter),
.filter = filter,
};
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf)) < 0)
error(1, errno, "error setting filter");
}
static uint32_t checksum_nofold(void *data, size_t len, uint32_t sum)
{
uint16_t *words = data;
int i;
for (i = 0; i < len / 2; i++)
sum += words[i];
if (len & 1)
sum += ((char *)data)[len - 1];
return sum;
}
static uint16_t checksum_fold(void *data, size_t len, uint32_t sum)
{
sum = checksum_nofold(data, len, sum);
while (sum > 0xFFFF)
sum = (sum & 0xFFFF) + (sum >> 16);
return ~sum;
}
static uint16_t tcp_checksum(void *buf, int payload_len)
{
struct pseudo_header6 {
struct in6_addr saddr;
struct in6_addr daddr;
uint16_t protocol;
uint16_t payload_len;
} ph6;
struct pseudo_header4 {
struct in_addr saddr;
struct in_addr daddr;
uint16_t protocol;
uint16_t payload_len;
} ph4;
uint32_t sum = 0;
if (proto == PF_INET6) {
if (inet_pton(AF_INET6, addr6_src, &ph6.saddr) != 1)
error(1, errno, "inet_pton6 source ip pseudo");
if (inet_pton(AF_INET6, addr6_dst, &ph6.daddr) != 1)
error(1, errno, "inet_pton6 dest ip pseudo");
ph6.protocol = htons(IPPROTO_TCP);
ph6.payload_len = htons(sizeof(struct tcphdr) + payload_len);
sum = checksum_nofold(&ph6, sizeof(ph6), 0);
} else if (proto == PF_INET) {
if (inet_pton(AF_INET, addr4_src, &ph4.saddr) != 1)
error(1, errno, "inet_pton source ip pseudo");
if (inet_pton(AF_INET, addr4_dst, &ph4.daddr) != 1)
error(1, errno, "inet_pton dest ip pseudo");
ph4.protocol = htons(IPPROTO_TCP);
ph4.payload_len = htons(sizeof(struct tcphdr) + payload_len);
sum = checksum_nofold(&ph4, sizeof(ph4), 0);
}
return checksum_fold(buf, sizeof(struct tcphdr) + payload_len, sum);
}
static void read_MAC(uint8_t *mac_addr, char *mac)
{
if (sscanf(mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
&mac_addr[0], &mac_addr[1], &mac_addr[2],
&mac_addr[3], &mac_addr[4], &mac_addr[5]) != 6)
error(1, 0, "sscanf");
}
static void fill_datalinklayer(void *buf)
{
struct ethhdr *eth = buf;
memcpy(eth->h_dest, dst_mac, ETH_ALEN);
memcpy(eth->h_source, src_mac, ETH_ALEN);
eth->h_proto = ethhdr_proto;
}
static void fill_networklayer(void *buf, int payload_len)
{
struct ipv6hdr *ip6h = buf;
struct iphdr *iph = buf;
if (proto == PF_INET6) {
memset(ip6h, 0, sizeof(*ip6h));
ip6h->version = 6;
ip6h->payload_len = htons(sizeof(struct tcphdr) + payload_len);
ip6h->nexthdr = IPPROTO_TCP;
ip6h->hop_limit = 8;
if (inet_pton(AF_INET6, addr6_src, &ip6h->saddr) != 1)
error(1, errno, "inet_pton source ip6");
if (inet_pton(AF_INET6, addr6_dst, &ip6h->daddr) != 1)
error(1, errno, "inet_pton dest ip6");
} else if (proto == PF_INET) {
memset(iph, 0, sizeof(*iph));
iph->version = 4;
iph->ihl = 5;
iph->ttl = 8;
iph->protocol = IPPROTO_TCP;
iph->tot_len = htons(sizeof(struct tcphdr) +
payload_len + sizeof(struct iphdr));
iph->frag_off = htons(0x4000); /* DF = 1, MF = 0 */
if (inet_pton(AF_INET, addr4_src, &iph->saddr) != 1)
error(1, errno, "inet_pton source ip");
if (inet_pton(AF_INET, addr4_dst, &iph->daddr) != 1)
error(1, errno, "inet_pton dest ip");
iph->check = checksum_fold(buf, sizeof(struct iphdr), 0);
}
}
static void fill_transportlayer(void *buf, int seq_offset, int ack_offset,
int payload_len, int fin)
{
struct tcphdr *tcph = buf;
memset(tcph, 0, sizeof(*tcph));
tcph->source = htons(SPORT);
tcph->dest = htons(DPORT);
tcph->seq = ntohl(START_SEQ + seq_offset);
tcph->ack_seq = ntohl(START_ACK + ack_offset);
tcph->ack = 1;
tcph->fin = fin;
tcph->doff = 5;
tcph->window = htons(TCP_MAXWIN);
tcph->urg_ptr = 0;
tcph->check = tcp_checksum(tcph, payload_len);
}
static void write_packet(int fd, char *buf, int len, struct sockaddr_ll *daddr)
{
int ret = -1;
ret = sendto(fd, buf, len, 0, (struct sockaddr *)daddr, sizeof(*daddr));
if (ret == -1)
error(1, errno, "sendto failure");
if (ret != len)
error(1, errno, "sendto wrong length");
}
static void create_packet(void *buf, int seq_offset, int ack_offset,
int payload_len, int fin)
{
memset(buf, 0, total_hdr_len);
memset(buf + total_hdr_len, 'a', payload_len);
fill_transportlayer(buf + tcp_offset, seq_offset, ack_offset,
payload_len, fin);
fill_networklayer(buf + ETH_HLEN, payload_len);
fill_datalinklayer(buf);
}
/* send one extra flag, not first and not last pkt */
static void send_flags(int fd, struct sockaddr_ll *daddr, int psh, int syn,
int rst, int urg)
{
static char flag_buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
int payload_len, pkt_size, flag, i;
struct tcphdr *tcph;
payload_len = PAYLOAD_LEN * psh;
pkt_size = total_hdr_len + payload_len;
flag = NUM_PACKETS / 2;
create_packet(flag_buf, flag * payload_len, 0, payload_len, 0);
tcph = (struct tcphdr *)(flag_buf + tcp_offset);
tcph->psh = psh;
tcph->syn = syn;
tcph->rst = rst;
tcph->urg = urg;
tcph->check = 0;
tcph->check = tcp_checksum(tcph, payload_len);
for (i = 0; i < NUM_PACKETS + 1; i++) {
if (i == flag) {
write_packet(fd, flag_buf, pkt_size, daddr);
continue;
}
create_packet(buf, i * PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
}
}
/* Test for data of same length, smaller than previous
* and of different lengths
*/
static void send_data_pkts(int fd, struct sockaddr_ll *daddr,
int payload_len1, int payload_len2)
{
static char buf[ETH_HLEN + IP_MAXPACKET];
create_packet(buf, 0, 0, payload_len1, 0);
write_packet(fd, buf, total_hdr_len + payload_len1, daddr);
create_packet(buf, payload_len1, 0, payload_len2, 0);
write_packet(fd, buf, total_hdr_len + payload_len2, daddr);
}
/* If incoming segments make tracked segment length exceed
* legal IP datagram length, do not coalesce
*/
static void send_large(int fd, struct sockaddr_ll *daddr, int remainder)
{
static char pkts[NUM_LARGE_PKT][TOTAL_HDR_LEN + MSS];
static char last[TOTAL_HDR_LEN + MSS];
static char new_seg[TOTAL_HDR_LEN + MSS];
int i;
for (i = 0; i < NUM_LARGE_PKT; i++)
create_packet(pkts[i], i * MSS, 0, MSS, 0);
create_packet(last, NUM_LARGE_PKT * MSS, 0, remainder, 0);
create_packet(new_seg, (NUM_LARGE_PKT + 1) * MSS, 0, remainder, 0);
for (i = 0; i < NUM_LARGE_PKT; i++)
write_packet(fd, pkts[i], total_hdr_len + MSS, daddr);
write_packet(fd, last, total_hdr_len + remainder, daddr);
write_packet(fd, new_seg, total_hdr_len + remainder, daddr);
}
/* Pure acks and dup acks don't coalesce */
static void send_ack(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN];
create_packet(buf, 0, 0, 0, 0);
write_packet(fd, buf, total_hdr_len, daddr);
write_packet(fd, buf, total_hdr_len, daddr);
create_packet(buf, 0, 1, 0, 0);
write_packet(fd, buf, total_hdr_len, daddr);
}
static void recompute_packet(char *buf, char *no_ext, int extlen)
{
struct tcphdr *tcphdr = (struct tcphdr *)(buf + tcp_offset);
struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
memmove(buf, no_ext, total_hdr_len);
memmove(buf + total_hdr_len + extlen,
no_ext + total_hdr_len, PAYLOAD_LEN);
tcphdr->doff = tcphdr->doff + (extlen / 4);
tcphdr->check = 0;
tcphdr->check = tcp_checksum(tcphdr, PAYLOAD_LEN + extlen);
if (proto == PF_INET) {
iph->tot_len = htons(ntohs(iph->tot_len) + extlen);
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
} else {
ip6h->payload_len = htons(ntohs(ip6h->payload_len) + extlen);
}
}
static void tcp_write_options(char *buf, int kind, int ts)
{
struct tcp_option_ts {
uint8_t kind;
uint8_t len;
uint32_t tsval;
uint32_t tsecr;
} *opt_ts = (void *)buf;
struct tcp_option_window {
uint8_t kind;
uint8_t len;
uint8_t shift;
} *opt_window = (void *)buf;
switch (kind) {
case TCPOPT_NOP:
buf[0] = TCPOPT_NOP;
break;
case TCPOPT_WINDOW:
memset(opt_window, 0, sizeof(struct tcp_option_window));
opt_window->kind = TCPOPT_WINDOW;
opt_window->len = TCPOLEN_WINDOW;
opt_window->shift = 0;
break;
case TCPOPT_TIMESTAMP:
memset(opt_ts, 0, sizeof(struct tcp_option_ts));
opt_ts->kind = TCPOPT_TIMESTAMP;
opt_ts->len = TCPOLEN_TIMESTAMP;
opt_ts->tsval = ts;
opt_ts->tsecr = 0;
break;
default:
error(1, 0, "unimplemented TCP option");
break;
}
}
/* TCP with options is always a permutation of {TS, NOP, NOP}.
* Implement different orders to verify coalescing stops.
*/
static void add_standard_tcp_options(char *buf, char *no_ext, int ts, int order)
{
switch (order) {
case 0:
tcp_write_options(buf + total_hdr_len, TCPOPT_NOP, 0);
tcp_write_options(buf + total_hdr_len + 1, TCPOPT_NOP, 0);
tcp_write_options(buf + total_hdr_len + 2 /* two NOP opts */,
TCPOPT_TIMESTAMP, ts);
break;
case 1:
tcp_write_options(buf + total_hdr_len, TCPOPT_NOP, 0);
tcp_write_options(buf + total_hdr_len + 1,
TCPOPT_TIMESTAMP, ts);
tcp_write_options(buf + total_hdr_len + 1 + TCPOLEN_TIMESTAMP,
TCPOPT_NOP, 0);
break;
case 2:
tcp_write_options(buf + total_hdr_len, TCPOPT_TIMESTAMP, ts);
tcp_write_options(buf + total_hdr_len + TCPOLEN_TIMESTAMP + 1,
TCPOPT_NOP, 0);
tcp_write_options(buf + total_hdr_len + TCPOLEN_TIMESTAMP + 2,
TCPOPT_NOP, 0);
break;
default:
error(1, 0, "unknown order");
break;
}
recompute_packet(buf, no_ext, TCPOLEN_TSTAMP_APPA);
}
/* Packets with invalid checksum don't coalesce. */
static void send_changed_checksum(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
struct tcphdr *tcph = (struct tcphdr *)(buf + tcp_offset);
int pkt_size = total_hdr_len + PAYLOAD_LEN;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
tcph->check = tcph->check - 1;
write_packet(fd, buf, pkt_size, daddr);
}
/* Packets with non-consecutive sequence number don't coalesce.*/
static void send_changed_seq(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
struct tcphdr *tcph = (struct tcphdr *)(buf + tcp_offset);
int pkt_size = total_hdr_len + PAYLOAD_LEN;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
tcph->seq = ntohl(htonl(tcph->seq) + 1);
tcph->check = 0;
tcph->check = tcp_checksum(tcph, PAYLOAD_LEN);
write_packet(fd, buf, pkt_size, daddr);
}
/* Packet with different timestamp option or different timestamps
* don't coalesce.
*/
static void send_changed_ts(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char extpkt[sizeof(buf) + TCPOLEN_TSTAMP_APPA];
int pkt_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_TSTAMP_APPA;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt, buf, 0, 0);
write_packet(fd, extpkt, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt, buf, 0, 0);
write_packet(fd, extpkt, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt, buf, 100, 0);
write_packet(fd, extpkt, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN * 3, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt, buf, 100, 1);
write_packet(fd, extpkt, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN * 4, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt, buf, 100, 2);
write_packet(fd, extpkt, pkt_size, daddr);
}
/* Packet with different tcp options don't coalesce. */
static void send_diff_opt(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char extpkt1[sizeof(buf) + TCPOLEN_TSTAMP_APPA];
static char extpkt2[sizeof(buf) + TCPOLEN_MAXSEG];
int extpkt1_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_TSTAMP_APPA;
int extpkt2_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_MAXSEG;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt1, buf, 0, 0);
write_packet(fd, extpkt1, extpkt1_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
add_standard_tcp_options(extpkt1, buf, 0, 0);
write_packet(fd, extpkt1, extpkt1_size, daddr);
create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
tcp_write_options(extpkt2 + MAX_HDR_LEN, TCPOPT_NOP, 0);
tcp_write_options(extpkt2 + MAX_HDR_LEN + 1, TCPOPT_WINDOW, 0);
recompute_packet(extpkt2, buf, TCPOLEN_WINDOW + 1);
write_packet(fd, extpkt2, extpkt2_size, daddr);
}
static void add_ipv4_ts_option(void *buf, void *optpkt)
{
struct ip_timestamp *ts = (struct ip_timestamp *)(optpkt + tcp_offset);
int optlen = sizeof(struct ip_timestamp);
struct iphdr *iph;
if (optlen % 4)
error(1, 0, "ipv4 timestamp length is not a multiple of 4B");
ts->ipt_code = IPOPT_TS;
ts->ipt_len = optlen;
ts->ipt_ptr = 5;
ts->ipt_flg = IPOPT_TS_TSONLY;
memcpy(optpkt, buf, tcp_offset);
memcpy(optpkt + tcp_offset + optlen, buf + tcp_offset,
sizeof(struct tcphdr) + PAYLOAD_LEN);
iph = (struct iphdr *)(optpkt + ETH_HLEN);
iph->ihl = 5 + (optlen / 4);
iph->tot_len = htons(ntohs(iph->tot_len) + optlen);
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr) + optlen, 0);
}
static void add_ipv6_exthdr(void *buf, void *optpkt, __u8 exthdr_type, char *ext_payload)
{
struct ipv6_opt_hdr *exthdr = (struct ipv6_opt_hdr *)(optpkt + tcp_offset);
struct ipv6hdr *iph = (struct ipv6hdr *)(optpkt + ETH_HLEN);
char *exthdr_payload_start = (char *)(exthdr + 1);
exthdr->hdrlen = 0;
exthdr->nexthdr = IPPROTO_TCP;
memcpy(exthdr_payload_start, ext_payload, MIN_EXTHDR_SIZE - sizeof(*exthdr));
memcpy(optpkt, buf, tcp_offset);
memcpy(optpkt + tcp_offset + MIN_EXTHDR_SIZE, buf + tcp_offset,
sizeof(struct tcphdr) + PAYLOAD_LEN);
iph->nexthdr = exthdr_type;
iph->payload_len = htons(ntohs(iph->payload_len) + MIN_EXTHDR_SIZE);
}
static void fix_ip4_checksum(struct iphdr *iph)
{
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
}
static void send_flush_id_case(int fd, struct sockaddr_ll *daddr, int tcase)
{
static char buf1[MAX_HDR_LEN + PAYLOAD_LEN];
static char buf2[MAX_HDR_LEN + PAYLOAD_LEN];
static char buf3[MAX_HDR_LEN + PAYLOAD_LEN];
bool send_three = false;
struct iphdr *iph1;
struct iphdr *iph2;
struct iphdr *iph3;
iph1 = (struct iphdr *)(buf1 + ETH_HLEN);
iph2 = (struct iphdr *)(buf2 + ETH_HLEN);
iph3 = (struct iphdr *)(buf3 + ETH_HLEN);
create_packet(buf1, 0, 0, PAYLOAD_LEN, 0);
create_packet(buf2, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
create_packet(buf3, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
switch (tcase) {
case 0: /* DF=1, Incrementing - should coalesce */
iph1->frag_off |= htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off |= htons(IP_DF);
iph2->id = htons(9);
break;
case 1: /* DF=1, Fixed - should coalesce */
iph1->frag_off |= htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off |= htons(IP_DF);
iph2->id = htons(8);
break;
case 2: /* DF=0, Incrementing - should coalesce */
iph1->frag_off &= ~htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off &= ~htons(IP_DF);
iph2->id = htons(9);
break;
case 3: /* DF=0, Fixed - should not coalesce */
iph1->frag_off &= ~htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off &= ~htons(IP_DF);
iph2->id = htons(8);
break;
case 4: /* DF=1, two packets incrementing, and one fixed - should
* coalesce only the first two packets
*/
iph1->frag_off |= htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off |= htons(IP_DF);
iph2->id = htons(9);
iph3->frag_off |= htons(IP_DF);
iph3->id = htons(9);
send_three = true;
break;
case 5: /* DF=1, two packets fixed, and one incrementing - should
* coalesce only the first two packets
*/
iph1->frag_off |= htons(IP_DF);
iph1->id = htons(8);
iph2->frag_off |= htons(IP_DF);
iph2->id = htons(8);
iph3->frag_off |= htons(IP_DF);
iph3->id = htons(9);
send_three = true;
break;
}
fix_ip4_checksum(iph1);
fix_ip4_checksum(iph2);
write_packet(fd, buf1, total_hdr_len + PAYLOAD_LEN, daddr);
write_packet(fd, buf2, total_hdr_len + PAYLOAD_LEN, daddr);
if (send_three) {
fix_ip4_checksum(iph3);
write_packet(fd, buf3, total_hdr_len + PAYLOAD_LEN, daddr);
}
}
static void test_flush_id(int fd, struct sockaddr_ll *daddr, char *fin_pkt)
{
for (int i = 0; i < num_flush_id_cases; i++) {
sleep(1);
send_flush_id_case(fd, daddr, i);
sleep(1);
write_packet(fd, fin_pkt, total_hdr_len, daddr);
}
}
static void send_ipv6_exthdr(int fd, struct sockaddr_ll *daddr, char *ext_data1, char *ext_data2)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char exthdr_pck[sizeof(buf) + MIN_EXTHDR_SIZE];
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS, ext_data1);
write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr);
create_packet(buf, PAYLOAD_LEN * 1, 0, PAYLOAD_LEN, 0);
add_ipv6_exthdr(buf, exthdr_pck, IPPROTO_HOPOPTS, ext_data2);
write_packet(fd, exthdr_pck, total_hdr_len + PAYLOAD_LEN + MIN_EXTHDR_SIZE, daddr);
}
/* IPv4 options shouldn't coalesce */
static void send_ip_options(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char optpkt[sizeof(buf) + sizeof(struct ip_timestamp)];
int optlen = sizeof(struct ip_timestamp);
int pkt_size = total_hdr_len + PAYLOAD_LEN + optlen;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
create_packet(buf, PAYLOAD_LEN * 1, 0, PAYLOAD_LEN, 0);
add_ipv4_ts_option(buf, optpkt);
write_packet(fd, optpkt, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
}
/* IPv4 fragments shouldn't coalesce */
static void send_fragment4(int fd, struct sockaddr_ll *daddr)
{
static char buf[IP_MAXPACKET];
struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
int pkt_size = total_hdr_len + PAYLOAD_LEN;
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
/* Once fragmented, packet would retain the total_len.
* Tcp header is prepared as if rest of data is in follow-up frags,
* but follow up frags aren't actually sent.
*/
memset(buf + total_hdr_len, 'a', PAYLOAD_LEN * 2);
fill_transportlayer(buf + tcp_offset, PAYLOAD_LEN, 0, PAYLOAD_LEN * 2, 0);
fill_networklayer(buf + ETH_HLEN, PAYLOAD_LEN);
fill_datalinklayer(buf);
iph->frag_off = htons(0x6000); // DF = 1, MF = 1
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
write_packet(fd, buf, pkt_size, daddr);
}
/* IPv4 packets with different ttl don't coalesce.*/
static void send_changed_ttl(int fd, struct sockaddr_ll *daddr)
{
int pkt_size = total_hdr_len + PAYLOAD_LEN;
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
iph->ttl = 7;
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
write_packet(fd, buf, pkt_size, daddr);
}
/* Packets with different tos don't coalesce.*/
static void send_changed_tos(int fd, struct sockaddr_ll *daddr)
{
int pkt_size = total_hdr_len + PAYLOAD_LEN;
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
if (proto == PF_INET) {
iph->tos = 1;
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
} else if (proto == PF_INET6) {
ip6h->priority = 0xf;
}
write_packet(fd, buf, pkt_size, daddr);
}
/* Packets with different ECN don't coalesce.*/
static void send_changed_ECN(int fd, struct sockaddr_ll *daddr)
{
int pkt_size = total_hdr_len + PAYLOAD_LEN;
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, pkt_size, daddr);
create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
if (proto == PF_INET) {
buf[ETH_HLEN + 1] ^= 0x2; // ECN set to 10
iph->check = 0;
iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
} else {
buf[ETH_HLEN + 1] ^= 0x20; // ECN set to 10
}
write_packet(fd, buf, pkt_size, daddr);
}
/* IPv6 fragments and packets with extensions don't coalesce.*/
static void send_fragment6(int fd, struct sockaddr_ll *daddr)
{
static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
static char extpkt[MAX_HDR_LEN + PAYLOAD_LEN +
sizeof(struct ip6_frag)];
struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
struct ip6_frag *frag = (void *)(extpkt + tcp_offset);
int extlen = sizeof(struct ip6_frag);
int bufpkt_len = total_hdr_len + PAYLOAD_LEN;
int extpkt_len = bufpkt_len + extlen;
int i;
for (i = 0; i < 2; i++) {
create_packet(buf, PAYLOAD_LEN * i, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, bufpkt_len, daddr);
}
sleep(1);
create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
memset(extpkt, 0, extpkt_len);
ip6h->nexthdr = IPPROTO_FRAGMENT;
ip6h->payload_len = htons(ntohs(ip6h->payload_len) + extlen);
frag->ip6f_nxt = IPPROTO_TCP;
memcpy(extpkt, buf, tcp_offset);
memcpy(extpkt + tcp_offset + extlen, buf + tcp_offset,
sizeof(struct tcphdr) + PAYLOAD_LEN);
write_packet(fd, extpkt, extpkt_len, daddr);
create_packet(buf, PAYLOAD_LEN * 3, 0, PAYLOAD_LEN, 0);
write_packet(fd, buf, bufpkt_len, daddr);
}
static void bind_packetsocket(int fd)
{
struct sockaddr_ll daddr = {};
daddr.sll_family = AF_PACKET;
daddr.sll_protocol = ethhdr_proto;
daddr.sll_ifindex = if_nametoindex(ifname);
if (daddr.sll_ifindex == 0)
error(1, errno, "if_nametoindex");
if (bind(fd, (void *)&daddr, sizeof(daddr)) < 0)
error(1, errno, "could not bind socket");
}
static void set_timeout(int fd)
{
struct timeval timeout;
timeout.tv_sec = 3;
timeout.tv_usec = 0;
if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,
sizeof(timeout)) < 0)
error(1, errno, "cannot set timeout, setsockopt failed");
}
static void check_recv_pkts(int fd, int *correct_payload,
int correct_num_pkts)
{
static char buffer[IP_MAXPACKET + ETH_HLEN + 1];
struct iphdr *iph = (struct iphdr *)(buffer + ETH_HLEN);
struct ipv6hdr *ip6h = (struct ipv6hdr *)(buffer + ETH_HLEN);
struct tcphdr *tcph;
bool bad_packet = false;
int tcp_ext_len = 0;
int ip_ext_len = 0;
int pkt_size = -1;
int data_len = 0;
int num_pkt = 0;
int i;
vlog("Expected {");
for (i = 0; i < correct_num_pkts; i++)
vlog("%d ", correct_payload[i]);
vlog("}, Total %d packets\nReceived {", correct_num_pkts);
while (1) {
ip_ext_len = 0;
pkt_size = recv(fd, buffer, IP_MAXPACKET + ETH_HLEN + 1, 0);
if (pkt_size < 0)
error(1, errno, "could not receive");
if (iph->version == 4)
ip_ext_len = (iph->ihl - 5) * 4;
else if (ip6h->version == 6 && ip6h->nexthdr != IPPROTO_TCP)
ip_ext_len = MIN_EXTHDR_SIZE;
tcph = (struct tcphdr *)(buffer + tcp_offset + ip_ext_len);
if (tcph->fin)
break;
tcp_ext_len = (tcph->doff - 5) * 4;
data_len = pkt_size - total_hdr_len - tcp_ext_len - ip_ext_len;
/* Min ethernet frame payload is 46(ETH_ZLEN - ETH_HLEN) by RFC 802.3.
* Ipv4/tcp packets without at least 6 bytes of data will be padded.
* Packet sockets are protocol agnostic, and will not trim the padding.
*/
if (pkt_size == ETH_ZLEN && iph->version == 4) {
data_len = ntohs(iph->tot_len)
- sizeof(struct tcphdr) - sizeof(struct iphdr);
}
vlog("%d ", data_len);
if (data_len != correct_payload[num_pkt]) {
vlog("[!=%d]", correct_payload[num_pkt]);
bad_packet = true;
}
num_pkt++;
}
vlog("}, Total %d packets.\n", num_pkt);
if (num_pkt != correct_num_pkts)
error(1, 0, "incorrect number of packets");
if (bad_packet)
error(1, 0, "incorrect packet geometry");
printf("Test succeeded\n\n");
}
static void gro_sender(void)
{
static char fin_pkt[MAX_HDR_LEN];
struct sockaddr_ll daddr = {};
int txfd = -1;
txfd = socket(PF_PACKET, SOCK_RAW, IPPROTO_RAW);
if (txfd < 0)
error(1, errno, "socket creation");
memset(&daddr, 0, sizeof(daddr));
daddr.sll_ifindex = if_nametoindex(ifname);
if (daddr.sll_ifindex == 0)
error(1, errno, "if_nametoindex");
daddr.sll_family = AF_PACKET;
memcpy(daddr.sll_addr, dst_mac, ETH_ALEN);
daddr.sll_halen = ETH_ALEN;
create_packet(fin_pkt, PAYLOAD_LEN * 2, 0, 0, 1);
if (strcmp(testname, "data") == 0) {
send_data_pkts(txfd, &daddr, PAYLOAD_LEN, PAYLOAD_LEN);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_data_pkts(txfd, &daddr, PAYLOAD_LEN, PAYLOAD_LEN / 2);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_data_pkts(txfd, &daddr, PAYLOAD_LEN / 2, PAYLOAD_LEN);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
} else if (strcmp(testname, "ack") == 0) {
send_ack(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
} else if (strcmp(testname, "flags") == 0) {
send_flags(txfd, &daddr, 1, 0, 0, 0);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_flags(txfd, &daddr, 0, 1, 0, 0);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_flags(txfd, &daddr, 0, 0, 1, 0);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_flags(txfd, &daddr, 0, 0, 0, 1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
} else if (strcmp(testname, "tcp") == 0) {
send_changed_checksum(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_changed_seq(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_changed_ts(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_diff_opt(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
} else if (strcmp(testname, "ip") == 0) {
send_changed_ECN(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_changed_tos(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
if (proto == PF_INET) {
/* Modified packets may be received out of order.
* Sleep function added to enforce test boundaries
* so that fin pkts are not received prior to other pkts.
*/
sleep(1);
send_changed_ttl(txfd, &daddr);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
sleep(1);
send_ip_options(txfd, &daddr);
sleep(1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
sleep(1);
send_fragment4(txfd, &daddr);
sleep(1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
test_flush_id(txfd, &daddr, fin_pkt);
} else if (proto == PF_INET6) {
sleep(1);
send_fragment6(txfd, &daddr);
sleep(1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
sleep(1);
/* send IPv6 packets with ext header with same payload */
send_ipv6_exthdr(txfd, &daddr, EXT_PAYLOAD_1, EXT_PAYLOAD_1);
sleep(1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
sleep(1);
/* send IPv6 packets with ext header with different payload */
send_ipv6_exthdr(txfd, &daddr, EXT_PAYLOAD_1, EXT_PAYLOAD_2);
sleep(1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
}
} else if (strcmp(testname, "large") == 0) {
/* 20 is the difference between min iphdr size
* and min ipv6hdr size. Like MAX_HDR_SIZE,
* MAX_PAYLOAD is defined with the larger header of the two.
*/
int offset = proto == PF_INET ? 20 : 0;
int remainder = (MAX_PAYLOAD + offset) % MSS;
send_large(txfd, &daddr, remainder);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
send_large(txfd, &daddr, remainder + 1);
write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
} else {
error(1, 0, "Unknown testcase");
}
if (close(txfd))
error(1, errno, "socket close");
}
static void gro_receiver(void)
{
static int correct_payload[NUM_PACKETS];
int rxfd = -1;
rxfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_NONE));
if (rxfd < 0)
error(1, 0, "socket creation");
setup_sock_filter(rxfd);
set_timeout(rxfd);
bind_packetsocket(rxfd);
memset(correct_payload, 0, sizeof(correct_payload));
if (strcmp(testname, "data") == 0) {
printf("pure data packet of same size: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 1);
printf("large data packets followed by a smaller one: ");
correct_payload[0] = PAYLOAD_LEN * 1.5;
check_recv_pkts(rxfd, correct_payload, 1);
printf("small data packets followed by a larger one: ");
correct_payload[0] = PAYLOAD_LEN / 2;
correct_payload[1] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 2);
} else if (strcmp(testname, "ack") == 0) {
printf("duplicate ack and pure ack: ");
check_recv_pkts(rxfd, correct_payload, 3);
} else if (strcmp(testname, "flags") == 0) {
correct_payload[0] = PAYLOAD_LEN * 3;
correct_payload[1] = PAYLOAD_LEN * 2;
printf("psh flag ends coalescing: ");
check_recv_pkts(rxfd, correct_payload, 2);
correct_payload[0] = PAYLOAD_LEN * 2;
correct_payload[1] = 0;
correct_payload[2] = PAYLOAD_LEN * 2;
printf("syn flag ends coalescing: ");
check_recv_pkts(rxfd, correct_payload, 3);
printf("rst flag ends coalescing: ");
check_recv_pkts(rxfd, correct_payload, 3);
printf("urg flag ends coalescing: ");
check_recv_pkts(rxfd, correct_payload, 3);
} else if (strcmp(testname, "tcp") == 0) {
correct_payload[0] = PAYLOAD_LEN;
correct_payload[1] = PAYLOAD_LEN;
correct_payload[2] = PAYLOAD_LEN;
correct_payload[3] = PAYLOAD_LEN;
printf("changed checksum does not coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
printf("Wrong Seq number doesn't coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
printf("Different timestamp doesn't coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 4);
printf("Different options doesn't coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 2);
} else if (strcmp(testname, "ip") == 0) {
correct_payload[0] = PAYLOAD_LEN;
correct_payload[1] = PAYLOAD_LEN;
printf("different ECN doesn't coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
printf("different tos doesn't coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
if (proto == PF_INET) {
printf("different ttl doesn't coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
printf("ip options doesn't coalesce: ");
correct_payload[2] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 3);
printf("fragmented ip4 doesn't coalesce: ");
check_recv_pkts(rxfd, correct_payload, 2);
/* is_atomic checks */
printf("DF=1, Incrementing - should coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 1);
printf("DF=1, Fixed - should coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 1);
printf("DF=0, Incrementing - should coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 1);
printf("DF=0, Fixed - should not coalesce: ");
correct_payload[0] = PAYLOAD_LEN;
correct_payload[1] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 2);
printf("DF=1, 2 Incrementing and one fixed - should coalesce only first 2 packets: ");
correct_payload[0] = PAYLOAD_LEN * 2;
correct_payload[1] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 2);
printf("DF=1, 2 Fixed and one incrementing - should coalesce only first 2 packets: ");
correct_payload[0] = PAYLOAD_LEN * 2;
correct_payload[1] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 2);
} else if (proto == PF_INET6) {
/* GRO doesn't check for ipv6 hop limit when flushing.
* Hence no corresponding test to the ipv4 case.
*/
printf("fragmented ip6 doesn't coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
correct_payload[1] = PAYLOAD_LEN;
correct_payload[2] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 3);
printf("ipv6 with ext header does coalesce: ");
correct_payload[0] = PAYLOAD_LEN * 2;
check_recv_pkts(rxfd, correct_payload, 1);
printf("ipv6 with ext header with different payloads doesn't coalesce: ");
correct_payload[0] = PAYLOAD_LEN;
correct_payload[1] = PAYLOAD_LEN;
check_recv_pkts(rxfd, correct_payload, 2);
}
} else if (strcmp(testname, "large") == 0) {
int offset = proto == PF_INET ? 20 : 0;
int remainder = (MAX_PAYLOAD + offset) % MSS;
correct_payload[0] = (MAX_PAYLOAD + offset);
correct_payload[1] = remainder;
printf("Shouldn't coalesce if exceed IP max pkt size: ");
check_recv_pkts(rxfd, correct_payload, 2);
/* last segment sent individually, doesn't start new segment */
correct_payload[0] = correct_payload[0] - remainder;
correct_payload[1] = remainder + 1;
correct_payload[2] = remainder + 1;
check_recv_pkts(rxfd, correct_payload, 3);
} else {
error(1, 0, "Test case error, should never trigger");
}
if (close(rxfd))
error(1, 0, "socket close");
}
static void parse_args(int argc, char **argv)
{
static const struct option opts[] = {
{ "daddr", required_argument, NULL, 'd' },
{ "dmac", required_argument, NULL, 'D' },
{ "iface", required_argument, NULL, 'i' },
{ "ipv4", no_argument, NULL, '4' },
{ "ipv6", no_argument, NULL, '6' },
{ "rx", no_argument, NULL, 'r' },
{ "saddr", required_argument, NULL, 's' },
{ "smac", required_argument, NULL, 'S' },
{ "test", required_argument, NULL, 't' },
{ "verbose", no_argument, NULL, 'v' },
{ 0, 0, 0, 0 }
};
int c;
while ((c = getopt_long(argc, argv, "46d:D:i:rs:S:t:v", opts, NULL)) != -1) {
switch (c) {
case '4':
proto = PF_INET;
ethhdr_proto = htons(ETH_P_IP);
break;
case '6':
proto = PF_INET6;
ethhdr_proto = htons(ETH_P_IPV6);
break;
case 'd':
addr4_dst = addr6_dst = optarg;
break;
case 'D':
dmac = optarg;
break;
case 'i':
ifname = optarg;
break;
case 'r':
tx_socket = false;
break;
case 's':
addr4_src = addr6_src = optarg;
break;
case 'S':
smac = optarg;
break;
case 't':
testname = optarg;
break;
case 'v':
verbose = true;
break;
default:
error(1, 0, "%s invalid option %c\n", __func__, c);
break;
}
}
}
int main(int argc, char **argv)
{
parse_args(argc, argv);
if (proto == PF_INET) {
tcp_offset = ETH_HLEN + sizeof(struct iphdr);
total_hdr_len = tcp_offset + sizeof(struct tcphdr);
} else if (proto == PF_INET6) {
tcp_offset = ETH_HLEN + sizeof(struct ipv6hdr);
total_hdr_len = MAX_HDR_LEN;
} else {
error(1, 0, "Protocol family is not ipv4 or ipv6");
}
read_MAC(src_mac, smac);
read_MAC(dst_mac, dmac);
if (tx_socket)
gro_sender();
else
gro_receiver();
fprintf(stderr, "Gro::%s test passed.\n", testname);
return 0;
}
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