1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * This testsuite provides conformance testing for GRO coalescing.
4 *
5 * Test cases:
6 * 1.data
7 * Data packets of the same size and same header setup with correct
8 * sequence numbers coalesce. The one exception being the last data
9 * packet coalesced: it can be smaller than the rest and coalesced
10 * as long as it is in the same flow.
11 * 2.ack
12 * Pure ACK does not coalesce.
13 * 3.flags
14 * Specific test cases: no packets with PSH, SYN, URG, RST set will
15 * be coalesced.
16 * 4.tcp
17 * Packets with incorrect checksum, non-consecutive seqno and
18 * different TCP header options shouldn't coalesce. Nit: given that
19 * some extension headers have paddings, such as timestamp, headers
20 * that are padding differently would not be coalesced.
21 * 5.ip:
22 * Packets with different (ECN, TTL, TOS) header, ip options or
23 * ip fragments (ipv6) shouldn't coalesce.
24 * 6.large:
25 * Packets larger than GRO_MAX_SIZE packets shouldn't coalesce.
26 *
27 * MSS is defined as 4096 - header because if it is too small
28 * (i.e. 1500 MTU - header), it will result in many packets,
29 * increasing the "large" test case's flakiness. This is because
30 * due to time sensitivity in the coalescing window, the receiver
31 * may not coalesce all of the packets.
32 *
33 * Note the timing issue applies to all of the test cases, so some
34 * flakiness is to be expected.
35 *
36 */
37
38 #define _GNU_SOURCE
39
40 #include <arpa/inet.h>
41 #include <errno.h>
42 #include <error.h>
43 #include <getopt.h>
44 #include <linux/filter.h>
45 #include <linux/if_packet.h>
46 #include <linux/ipv6.h>
47 #include <net/ethernet.h>
48 #include <net/if.h>
49 #include <netinet/in.h>
50 #include <netinet/ip.h>
51 #include <netinet/ip6.h>
52 #include <netinet/tcp.h>
53 #include <stdbool.h>
54 #include <stddef.h>
55 #include <stdio.h>
56 #include <stdarg.h>
57 #include <string.h>
58 #include <unistd.h>
59
60 #include "../kselftest.h"
61
62 #define DPORT 8000
63 #define SPORT 1500
64 #define PAYLOAD_LEN 100
65 #define NUM_PACKETS 4
66 #define START_SEQ 100
67 #define START_ACK 100
68 #define ETH_P_NONE 0
69 #define TOTAL_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
70 #define MSS (4096 - sizeof(struct tcphdr) - sizeof(struct ipv6hdr))
71 #define MAX_PAYLOAD (IP_MAXPACKET - sizeof(struct tcphdr) - sizeof(struct ipv6hdr))
72 #define NUM_LARGE_PKT (MAX_PAYLOAD / MSS)
73 #define MAX_HDR_LEN (ETH_HLEN + sizeof(struct ipv6hdr) + sizeof(struct tcphdr))
74
75 static const char *addr6_src = "fdaa::2";
76 static const char *addr6_dst = "fdaa::1";
77 static const char *addr4_src = "192.168.1.200";
78 static const char *addr4_dst = "192.168.1.100";
79 static int proto = -1;
80 static uint8_t src_mac[ETH_ALEN], dst_mac[ETH_ALEN];
81 static char *testname = "data";
82 static char *ifname = "eth0";
83 static char *smac = "aa:00:00:00:00:02";
84 static char *dmac = "aa:00:00:00:00:01";
85 static bool verbose;
86 static bool tx_socket = true;
87 static int tcp_offset = -1;
88 static int total_hdr_len = -1;
89 static int ethhdr_proto = -1;
90
vlog(const char * fmt,...)91 static void vlog(const char *fmt, ...)
92 {
93 va_list args;
94
95 if (verbose) {
96 va_start(args, fmt);
97 vfprintf(stderr, fmt, args);
98 va_end(args);
99 }
100 }
101
setup_sock_filter(int fd)102 static void setup_sock_filter(int fd)
103 {
104 const int dport_off = tcp_offset + offsetof(struct tcphdr, dest);
105 const int ethproto_off = offsetof(struct ethhdr, h_proto);
106 int optlen = 0;
107 int ipproto_off;
108 int next_off;
109
110 if (proto == PF_INET)
111 next_off = offsetof(struct iphdr, protocol);
112 else
113 next_off = offsetof(struct ipv6hdr, nexthdr);
114 ipproto_off = ETH_HLEN + next_off;
115
116 if (strcmp(testname, "ip") == 0) {
117 if (proto == PF_INET)
118 optlen = sizeof(struct ip_timestamp);
119 else
120 optlen = sizeof(struct ip6_frag);
121 }
122
123 struct sock_filter filter[] = {
124 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, ethproto_off),
125 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, ntohs(ethhdr_proto), 0, 7),
126 BPF_STMT(BPF_LD + BPF_B + BPF_ABS, ipproto_off),
127 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, IPPROTO_TCP, 0, 5),
128 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, dport_off),
129 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DPORT, 2, 0),
130 BPF_STMT(BPF_LD + BPF_H + BPF_ABS, dport_off + optlen),
131 BPF_JUMP(BPF_JMP + BPF_JEQ + BPF_K, DPORT, 0, 1),
132 BPF_STMT(BPF_RET + BPF_K, 0xFFFFFFFF),
133 BPF_STMT(BPF_RET + BPF_K, 0),
134 };
135
136 struct sock_fprog bpf = {
137 .len = ARRAY_SIZE(filter),
138 .filter = filter,
139 };
140
141 if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &bpf, sizeof(bpf)) < 0)
142 error(1, errno, "error setting filter");
143 }
144
checksum_nofold(void * data,size_t len,uint32_t sum)145 static uint32_t checksum_nofold(void *data, size_t len, uint32_t sum)
146 {
147 uint16_t *words = data;
148 int i;
149
150 for (i = 0; i < len / 2; i++)
151 sum += words[i];
152 if (len & 1)
153 sum += ((char *)data)[len - 1];
154 return sum;
155 }
156
checksum_fold(void * data,size_t len,uint32_t sum)157 static uint16_t checksum_fold(void *data, size_t len, uint32_t sum)
158 {
159 sum = checksum_nofold(data, len, sum);
160 while (sum > 0xFFFF)
161 sum = (sum & 0xFFFF) + (sum >> 16);
162 return ~sum;
163 }
164
tcp_checksum(void * buf,int payload_len)165 static uint16_t tcp_checksum(void *buf, int payload_len)
166 {
167 struct pseudo_header6 {
168 struct in6_addr saddr;
169 struct in6_addr daddr;
170 uint16_t protocol;
171 uint16_t payload_len;
172 } ph6;
173 struct pseudo_header4 {
174 struct in_addr saddr;
175 struct in_addr daddr;
176 uint16_t protocol;
177 uint16_t payload_len;
178 } ph4;
179 uint32_t sum = 0;
180
181 if (proto == PF_INET6) {
182 if (inet_pton(AF_INET6, addr6_src, &ph6.saddr) != 1)
183 error(1, errno, "inet_pton6 source ip pseudo");
184 if (inet_pton(AF_INET6, addr6_dst, &ph6.daddr) != 1)
185 error(1, errno, "inet_pton6 dest ip pseudo");
186 ph6.protocol = htons(IPPROTO_TCP);
187 ph6.payload_len = htons(sizeof(struct tcphdr) + payload_len);
188
189 sum = checksum_nofold(&ph6, sizeof(ph6), 0);
190 } else if (proto == PF_INET) {
191 if (inet_pton(AF_INET, addr4_src, &ph4.saddr) != 1)
192 error(1, errno, "inet_pton source ip pseudo");
193 if (inet_pton(AF_INET, addr4_dst, &ph4.daddr) != 1)
194 error(1, errno, "inet_pton dest ip pseudo");
195 ph4.protocol = htons(IPPROTO_TCP);
196 ph4.payload_len = htons(sizeof(struct tcphdr) + payload_len);
197
198 sum = checksum_nofold(&ph4, sizeof(ph4), 0);
199 }
200
201 return checksum_fold(buf, sizeof(struct tcphdr) + payload_len, sum);
202 }
203
read_MAC(uint8_t * mac_addr,char * mac)204 static void read_MAC(uint8_t *mac_addr, char *mac)
205 {
206 if (sscanf(mac, "%hhx:%hhx:%hhx:%hhx:%hhx:%hhx",
207 &mac_addr[0], &mac_addr[1], &mac_addr[2],
208 &mac_addr[3], &mac_addr[4], &mac_addr[5]) != 6)
209 error(1, 0, "sscanf");
210 }
211
fill_datalinklayer(void * buf)212 static void fill_datalinklayer(void *buf)
213 {
214 struct ethhdr *eth = buf;
215
216 memcpy(eth->h_dest, dst_mac, ETH_ALEN);
217 memcpy(eth->h_source, src_mac, ETH_ALEN);
218 eth->h_proto = ethhdr_proto;
219 }
220
fill_networklayer(void * buf,int payload_len)221 static void fill_networklayer(void *buf, int payload_len)
222 {
223 struct ipv6hdr *ip6h = buf;
224 struct iphdr *iph = buf;
225
226 if (proto == PF_INET6) {
227 memset(ip6h, 0, sizeof(*ip6h));
228
229 ip6h->version = 6;
230 ip6h->payload_len = htons(sizeof(struct tcphdr) + payload_len);
231 ip6h->nexthdr = IPPROTO_TCP;
232 ip6h->hop_limit = 8;
233 if (inet_pton(AF_INET6, addr6_src, &ip6h->saddr) != 1)
234 error(1, errno, "inet_pton source ip6");
235 if (inet_pton(AF_INET6, addr6_dst, &ip6h->daddr) != 1)
236 error(1, errno, "inet_pton dest ip6");
237 } else if (proto == PF_INET) {
238 memset(iph, 0, sizeof(*iph));
239
240 iph->version = 4;
241 iph->ihl = 5;
242 iph->ttl = 8;
243 iph->protocol = IPPROTO_TCP;
244 iph->tot_len = htons(sizeof(struct tcphdr) +
245 payload_len + sizeof(struct iphdr));
246 iph->frag_off = htons(0x4000); /* DF = 1, MF = 0 */
247 if (inet_pton(AF_INET, addr4_src, &iph->saddr) != 1)
248 error(1, errno, "inet_pton source ip");
249 if (inet_pton(AF_INET, addr4_dst, &iph->daddr) != 1)
250 error(1, errno, "inet_pton dest ip");
251 iph->check = checksum_fold(buf, sizeof(struct iphdr), 0);
252 }
253 }
254
fill_transportlayer(void * buf,int seq_offset,int ack_offset,int payload_len,int fin)255 static void fill_transportlayer(void *buf, int seq_offset, int ack_offset,
256 int payload_len, int fin)
257 {
258 struct tcphdr *tcph = buf;
259
260 memset(tcph, 0, sizeof(*tcph));
261
262 tcph->source = htons(SPORT);
263 tcph->dest = htons(DPORT);
264 tcph->seq = ntohl(START_SEQ + seq_offset);
265 tcph->ack_seq = ntohl(START_ACK + ack_offset);
266 tcph->ack = 1;
267 tcph->fin = fin;
268 tcph->doff = 5;
269 tcph->window = htons(TCP_MAXWIN);
270 tcph->urg_ptr = 0;
271 tcph->check = tcp_checksum(tcph, payload_len);
272 }
273
write_packet(int fd,char * buf,int len,struct sockaddr_ll * daddr)274 static void write_packet(int fd, char *buf, int len, struct sockaddr_ll *daddr)
275 {
276 int ret = -1;
277
278 ret = sendto(fd, buf, len, 0, (struct sockaddr *)daddr, sizeof(*daddr));
279 if (ret == -1)
280 error(1, errno, "sendto failure");
281 if (ret != len)
282 error(1, errno, "sendto wrong length");
283 }
284
create_packet(void * buf,int seq_offset,int ack_offset,int payload_len,int fin)285 static void create_packet(void *buf, int seq_offset, int ack_offset,
286 int payload_len, int fin)
287 {
288 memset(buf, 0, total_hdr_len);
289 memset(buf + total_hdr_len, 'a', payload_len);
290 fill_transportlayer(buf + tcp_offset, seq_offset, ack_offset,
291 payload_len, fin);
292 fill_networklayer(buf + ETH_HLEN, payload_len);
293 fill_datalinklayer(buf);
294 }
295
296 /* send one extra flag, not first and not last pkt */
send_flags(int fd,struct sockaddr_ll * daddr,int psh,int syn,int rst,int urg)297 static void send_flags(int fd, struct sockaddr_ll *daddr, int psh, int syn,
298 int rst, int urg)
299 {
300 static char flag_buf[MAX_HDR_LEN + PAYLOAD_LEN];
301 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
302 int payload_len, pkt_size, flag, i;
303 struct tcphdr *tcph;
304
305 payload_len = PAYLOAD_LEN * psh;
306 pkt_size = total_hdr_len + payload_len;
307 flag = NUM_PACKETS / 2;
308
309 create_packet(flag_buf, flag * payload_len, 0, payload_len, 0);
310
311 tcph = (struct tcphdr *)(flag_buf + tcp_offset);
312 tcph->psh = psh;
313 tcph->syn = syn;
314 tcph->rst = rst;
315 tcph->urg = urg;
316 tcph->check = 0;
317 tcph->check = tcp_checksum(tcph, payload_len);
318
319 for (i = 0; i < NUM_PACKETS + 1; i++) {
320 if (i == flag) {
321 write_packet(fd, flag_buf, pkt_size, daddr);
322 continue;
323 }
324 create_packet(buf, i * PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
325 write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
326 }
327 }
328
329 /* Test for data of same length, smaller than previous
330 * and of different lengths
331 */
send_data_pkts(int fd,struct sockaddr_ll * daddr,int payload_len1,int payload_len2)332 static void send_data_pkts(int fd, struct sockaddr_ll *daddr,
333 int payload_len1, int payload_len2)
334 {
335 static char buf[ETH_HLEN + IP_MAXPACKET];
336
337 create_packet(buf, 0, 0, payload_len1, 0);
338 write_packet(fd, buf, total_hdr_len + payload_len1, daddr);
339 create_packet(buf, payload_len1, 0, payload_len2, 0);
340 write_packet(fd, buf, total_hdr_len + payload_len2, daddr);
341 }
342
343 /* If incoming segments make tracked segment length exceed
344 * legal IP datagram length, do not coalesce
345 */
send_large(int fd,struct sockaddr_ll * daddr,int remainder)346 static void send_large(int fd, struct sockaddr_ll *daddr, int remainder)
347 {
348 static char pkts[NUM_LARGE_PKT][TOTAL_HDR_LEN + MSS];
349 static char last[TOTAL_HDR_LEN + MSS];
350 static char new_seg[TOTAL_HDR_LEN + MSS];
351 int i;
352
353 for (i = 0; i < NUM_LARGE_PKT; i++)
354 create_packet(pkts[i], i * MSS, 0, MSS, 0);
355 create_packet(last, NUM_LARGE_PKT * MSS, 0, remainder, 0);
356 create_packet(new_seg, (NUM_LARGE_PKT + 1) * MSS, 0, remainder, 0);
357
358 for (i = 0; i < NUM_LARGE_PKT; i++)
359 write_packet(fd, pkts[i], total_hdr_len + MSS, daddr);
360 write_packet(fd, last, total_hdr_len + remainder, daddr);
361 write_packet(fd, new_seg, total_hdr_len + remainder, daddr);
362 }
363
364 /* Pure acks and dup acks don't coalesce */
send_ack(int fd,struct sockaddr_ll * daddr)365 static void send_ack(int fd, struct sockaddr_ll *daddr)
366 {
367 static char buf[MAX_HDR_LEN];
368
369 create_packet(buf, 0, 0, 0, 0);
370 write_packet(fd, buf, total_hdr_len, daddr);
371 write_packet(fd, buf, total_hdr_len, daddr);
372 create_packet(buf, 0, 1, 0, 0);
373 write_packet(fd, buf, total_hdr_len, daddr);
374 }
375
recompute_packet(char * buf,char * no_ext,int extlen)376 static void recompute_packet(char *buf, char *no_ext, int extlen)
377 {
378 struct tcphdr *tcphdr = (struct tcphdr *)(buf + tcp_offset);
379 struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
380 struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
381
382 memmove(buf, no_ext, total_hdr_len);
383 memmove(buf + total_hdr_len + extlen,
384 no_ext + total_hdr_len, PAYLOAD_LEN);
385
386 tcphdr->doff = tcphdr->doff + (extlen / 4);
387 tcphdr->check = 0;
388 tcphdr->check = tcp_checksum(tcphdr, PAYLOAD_LEN + extlen);
389 if (proto == PF_INET) {
390 iph->tot_len = htons(ntohs(iph->tot_len) + extlen);
391 iph->check = 0;
392 iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
393 } else {
394 ip6h->payload_len = htons(ntohs(ip6h->payload_len) + extlen);
395 }
396 }
397
tcp_write_options(char * buf,int kind,int ts)398 static void tcp_write_options(char *buf, int kind, int ts)
399 {
400 struct tcp_option_ts {
401 uint8_t kind;
402 uint8_t len;
403 uint32_t tsval;
404 uint32_t tsecr;
405 } *opt_ts = (void *)buf;
406 struct tcp_option_window {
407 uint8_t kind;
408 uint8_t len;
409 uint8_t shift;
410 } *opt_window = (void *)buf;
411
412 switch (kind) {
413 case TCPOPT_NOP:
414 buf[0] = TCPOPT_NOP;
415 break;
416 case TCPOPT_WINDOW:
417 memset(opt_window, 0, sizeof(struct tcp_option_window));
418 opt_window->kind = TCPOPT_WINDOW;
419 opt_window->len = TCPOLEN_WINDOW;
420 opt_window->shift = 0;
421 break;
422 case TCPOPT_TIMESTAMP:
423 memset(opt_ts, 0, sizeof(struct tcp_option_ts));
424 opt_ts->kind = TCPOPT_TIMESTAMP;
425 opt_ts->len = TCPOLEN_TIMESTAMP;
426 opt_ts->tsval = ts;
427 opt_ts->tsecr = 0;
428 break;
429 default:
430 error(1, 0, "unimplemented TCP option");
431 break;
432 }
433 }
434
435 /* TCP with options is always a permutation of {TS, NOP, NOP}.
436 * Implement different orders to verify coalescing stops.
437 */
add_standard_tcp_options(char * buf,char * no_ext,int ts,int order)438 static void add_standard_tcp_options(char *buf, char *no_ext, int ts, int order)
439 {
440 switch (order) {
441 case 0:
442 tcp_write_options(buf + total_hdr_len, TCPOPT_NOP, 0);
443 tcp_write_options(buf + total_hdr_len + 1, TCPOPT_NOP, 0);
444 tcp_write_options(buf + total_hdr_len + 2 /* two NOP opts */,
445 TCPOPT_TIMESTAMP, ts);
446 break;
447 case 1:
448 tcp_write_options(buf + total_hdr_len, TCPOPT_NOP, 0);
449 tcp_write_options(buf + total_hdr_len + 1,
450 TCPOPT_TIMESTAMP, ts);
451 tcp_write_options(buf + total_hdr_len + 1 + TCPOLEN_TIMESTAMP,
452 TCPOPT_NOP, 0);
453 break;
454 case 2:
455 tcp_write_options(buf + total_hdr_len, TCPOPT_TIMESTAMP, ts);
456 tcp_write_options(buf + total_hdr_len + TCPOLEN_TIMESTAMP + 1,
457 TCPOPT_NOP, 0);
458 tcp_write_options(buf + total_hdr_len + TCPOLEN_TIMESTAMP + 2,
459 TCPOPT_NOP, 0);
460 break;
461 default:
462 error(1, 0, "unknown order");
463 break;
464 }
465 recompute_packet(buf, no_ext, TCPOLEN_TSTAMP_APPA);
466 }
467
468 /* Packets with invalid checksum don't coalesce. */
send_changed_checksum(int fd,struct sockaddr_ll * daddr)469 static void send_changed_checksum(int fd, struct sockaddr_ll *daddr)
470 {
471 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
472 struct tcphdr *tcph = (struct tcphdr *)(buf + tcp_offset);
473 int pkt_size = total_hdr_len + PAYLOAD_LEN;
474
475 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
476 write_packet(fd, buf, pkt_size, daddr);
477
478 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
479 tcph->check = tcph->check - 1;
480 write_packet(fd, buf, pkt_size, daddr);
481 }
482
483 /* Packets with non-consecutive sequence number don't coalesce.*/
send_changed_seq(int fd,struct sockaddr_ll * daddr)484 static void send_changed_seq(int fd, struct sockaddr_ll *daddr)
485 {
486 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
487 struct tcphdr *tcph = (struct tcphdr *)(buf + tcp_offset);
488 int pkt_size = total_hdr_len + PAYLOAD_LEN;
489
490 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
491 write_packet(fd, buf, pkt_size, daddr);
492
493 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
494 tcph->seq = ntohl(htonl(tcph->seq) + 1);
495 tcph->check = 0;
496 tcph->check = tcp_checksum(tcph, PAYLOAD_LEN);
497 write_packet(fd, buf, pkt_size, daddr);
498 }
499
500 /* Packet with different timestamp option or different timestamps
501 * don't coalesce.
502 */
send_changed_ts(int fd,struct sockaddr_ll * daddr)503 static void send_changed_ts(int fd, struct sockaddr_ll *daddr)
504 {
505 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
506 static char extpkt[sizeof(buf) + TCPOLEN_TSTAMP_APPA];
507 int pkt_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_TSTAMP_APPA;
508
509 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
510 add_standard_tcp_options(extpkt, buf, 0, 0);
511 write_packet(fd, extpkt, pkt_size, daddr);
512
513 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
514 add_standard_tcp_options(extpkt, buf, 0, 0);
515 write_packet(fd, extpkt, pkt_size, daddr);
516
517 create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
518 add_standard_tcp_options(extpkt, buf, 100, 0);
519 write_packet(fd, extpkt, pkt_size, daddr);
520
521 create_packet(buf, PAYLOAD_LEN * 3, 0, PAYLOAD_LEN, 0);
522 add_standard_tcp_options(extpkt, buf, 100, 1);
523 write_packet(fd, extpkt, pkt_size, daddr);
524
525 create_packet(buf, PAYLOAD_LEN * 4, 0, PAYLOAD_LEN, 0);
526 add_standard_tcp_options(extpkt, buf, 100, 2);
527 write_packet(fd, extpkt, pkt_size, daddr);
528 }
529
530 /* Packet with different tcp options don't coalesce. */
send_diff_opt(int fd,struct sockaddr_ll * daddr)531 static void send_diff_opt(int fd, struct sockaddr_ll *daddr)
532 {
533 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
534 static char extpkt1[sizeof(buf) + TCPOLEN_TSTAMP_APPA];
535 static char extpkt2[sizeof(buf) + TCPOLEN_MAXSEG];
536 int extpkt1_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_TSTAMP_APPA;
537 int extpkt2_size = total_hdr_len + PAYLOAD_LEN + TCPOLEN_MAXSEG;
538
539 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
540 add_standard_tcp_options(extpkt1, buf, 0, 0);
541 write_packet(fd, extpkt1, extpkt1_size, daddr);
542
543 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
544 add_standard_tcp_options(extpkt1, buf, 0, 0);
545 write_packet(fd, extpkt1, extpkt1_size, daddr);
546
547 create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
548 tcp_write_options(extpkt2 + MAX_HDR_LEN, TCPOPT_NOP, 0);
549 tcp_write_options(extpkt2 + MAX_HDR_LEN + 1, TCPOPT_WINDOW, 0);
550 recompute_packet(extpkt2, buf, TCPOLEN_WINDOW + 1);
551 write_packet(fd, extpkt2, extpkt2_size, daddr);
552 }
553
add_ipv4_ts_option(void * buf,void * optpkt)554 static void add_ipv4_ts_option(void *buf, void *optpkt)
555 {
556 struct ip_timestamp *ts = (struct ip_timestamp *)(optpkt + tcp_offset);
557 int optlen = sizeof(struct ip_timestamp);
558 struct iphdr *iph;
559
560 if (optlen % 4)
561 error(1, 0, "ipv4 timestamp length is not a multiple of 4B");
562
563 ts->ipt_code = IPOPT_TS;
564 ts->ipt_len = optlen;
565 ts->ipt_ptr = 5;
566 ts->ipt_flg = IPOPT_TS_TSONLY;
567
568 memcpy(optpkt, buf, tcp_offset);
569 memcpy(optpkt + tcp_offset + optlen, buf + tcp_offset,
570 sizeof(struct tcphdr) + PAYLOAD_LEN);
571
572 iph = (struct iphdr *)(optpkt + ETH_HLEN);
573 iph->ihl = 5 + (optlen / 4);
574 iph->tot_len = htons(ntohs(iph->tot_len) + optlen);
575 iph->check = 0;
576 iph->check = checksum_fold(iph, sizeof(struct iphdr) + optlen, 0);
577 }
578
579 /* IPv4 options shouldn't coalesce */
send_ip_options(int fd,struct sockaddr_ll * daddr)580 static void send_ip_options(int fd, struct sockaddr_ll *daddr)
581 {
582 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
583 static char optpkt[sizeof(buf) + sizeof(struct ip_timestamp)];
584 int optlen = sizeof(struct ip_timestamp);
585 int pkt_size = total_hdr_len + PAYLOAD_LEN + optlen;
586
587 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
588 write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
589
590 create_packet(buf, PAYLOAD_LEN * 1, 0, PAYLOAD_LEN, 0);
591 add_ipv4_ts_option(buf, optpkt);
592 write_packet(fd, optpkt, pkt_size, daddr);
593
594 create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
595 write_packet(fd, buf, total_hdr_len + PAYLOAD_LEN, daddr);
596 }
597
598 /* IPv4 fragments shouldn't coalesce */
send_fragment4(int fd,struct sockaddr_ll * daddr)599 static void send_fragment4(int fd, struct sockaddr_ll *daddr)
600 {
601 static char buf[IP_MAXPACKET];
602 struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
603 int pkt_size = total_hdr_len + PAYLOAD_LEN;
604
605 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
606 write_packet(fd, buf, pkt_size, daddr);
607
608 /* Once fragmented, packet would retain the total_len.
609 * Tcp header is prepared as if rest of data is in follow-up frags,
610 * but follow up frags aren't actually sent.
611 */
612 memset(buf + total_hdr_len, 'a', PAYLOAD_LEN * 2);
613 fill_transportlayer(buf + tcp_offset, PAYLOAD_LEN, 0, PAYLOAD_LEN * 2, 0);
614 fill_networklayer(buf + ETH_HLEN, PAYLOAD_LEN);
615 fill_datalinklayer(buf);
616
617 iph->frag_off = htons(0x6000); // DF = 1, MF = 1
618 iph->check = 0;
619 iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
620 write_packet(fd, buf, pkt_size, daddr);
621 }
622
623 /* IPv4 packets with different ttl don't coalesce.*/
send_changed_ttl(int fd,struct sockaddr_ll * daddr)624 static void send_changed_ttl(int fd, struct sockaddr_ll *daddr)
625 {
626 int pkt_size = total_hdr_len + PAYLOAD_LEN;
627 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
628 struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
629
630 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
631 write_packet(fd, buf, pkt_size, daddr);
632
633 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
634 iph->ttl = 7;
635 iph->check = 0;
636 iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
637 write_packet(fd, buf, pkt_size, daddr);
638 }
639
640 /* Packets with different tos don't coalesce.*/
send_changed_tos(int fd,struct sockaddr_ll * daddr)641 static void send_changed_tos(int fd, struct sockaddr_ll *daddr)
642 {
643 int pkt_size = total_hdr_len + PAYLOAD_LEN;
644 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
645 struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
646 struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
647
648 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
649 write_packet(fd, buf, pkt_size, daddr);
650
651 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
652 if (proto == PF_INET) {
653 iph->tos = 1;
654 iph->check = 0;
655 iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
656 } else if (proto == PF_INET6) {
657 ip6h->priority = 0xf;
658 }
659 write_packet(fd, buf, pkt_size, daddr);
660 }
661
662 /* Packets with different ECN don't coalesce.*/
send_changed_ECN(int fd,struct sockaddr_ll * daddr)663 static void send_changed_ECN(int fd, struct sockaddr_ll *daddr)
664 {
665 int pkt_size = total_hdr_len + PAYLOAD_LEN;
666 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
667 struct iphdr *iph = (struct iphdr *)(buf + ETH_HLEN);
668
669 create_packet(buf, 0, 0, PAYLOAD_LEN, 0);
670 write_packet(fd, buf, pkt_size, daddr);
671
672 create_packet(buf, PAYLOAD_LEN, 0, PAYLOAD_LEN, 0);
673 if (proto == PF_INET) {
674 buf[ETH_HLEN + 1] ^= 0x2; // ECN set to 10
675 iph->check = 0;
676 iph->check = checksum_fold(iph, sizeof(struct iphdr), 0);
677 } else {
678 buf[ETH_HLEN + 1] ^= 0x20; // ECN set to 10
679 }
680 write_packet(fd, buf, pkt_size, daddr);
681 }
682
683 /* IPv6 fragments and packets with extensions don't coalesce.*/
send_fragment6(int fd,struct sockaddr_ll * daddr)684 static void send_fragment6(int fd, struct sockaddr_ll *daddr)
685 {
686 static char buf[MAX_HDR_LEN + PAYLOAD_LEN];
687 static char extpkt[MAX_HDR_LEN + PAYLOAD_LEN +
688 sizeof(struct ip6_frag)];
689 struct ipv6hdr *ip6h = (struct ipv6hdr *)(buf + ETH_HLEN);
690 struct ip6_frag *frag = (void *)(extpkt + tcp_offset);
691 int extlen = sizeof(struct ip6_frag);
692 int bufpkt_len = total_hdr_len + PAYLOAD_LEN;
693 int extpkt_len = bufpkt_len + extlen;
694 int i;
695
696 for (i = 0; i < 2; i++) {
697 create_packet(buf, PAYLOAD_LEN * i, 0, PAYLOAD_LEN, 0);
698 write_packet(fd, buf, bufpkt_len, daddr);
699 }
700
701 create_packet(buf, PAYLOAD_LEN * 2, 0, PAYLOAD_LEN, 0);
702 memset(extpkt, 0, extpkt_len);
703
704 ip6h->nexthdr = IPPROTO_FRAGMENT;
705 ip6h->payload_len = htons(ntohs(ip6h->payload_len) + extlen);
706 frag->ip6f_nxt = IPPROTO_TCP;
707
708 memcpy(extpkt, buf, tcp_offset);
709 memcpy(extpkt + tcp_offset + extlen, buf + tcp_offset,
710 sizeof(struct tcphdr) + PAYLOAD_LEN);
711 write_packet(fd, extpkt, extpkt_len, daddr);
712
713 create_packet(buf, PAYLOAD_LEN * 3, 0, PAYLOAD_LEN, 0);
714 write_packet(fd, buf, bufpkt_len, daddr);
715 }
716
bind_packetsocket(int fd)717 static void bind_packetsocket(int fd)
718 {
719 struct sockaddr_ll daddr = {};
720
721 daddr.sll_family = AF_PACKET;
722 daddr.sll_protocol = ethhdr_proto;
723 daddr.sll_ifindex = if_nametoindex(ifname);
724 if (daddr.sll_ifindex == 0)
725 error(1, errno, "if_nametoindex");
726
727 if (bind(fd, (void *)&daddr, sizeof(daddr)) < 0)
728 error(1, errno, "could not bind socket");
729 }
730
set_timeout(int fd)731 static void set_timeout(int fd)
732 {
733 struct timeval timeout;
734
735 timeout.tv_sec = 3;
736 timeout.tv_usec = 0;
737 if (setsockopt(fd, SOL_SOCKET, SO_RCVTIMEO, (char *)&timeout,
738 sizeof(timeout)) < 0)
739 error(1, errno, "cannot set timeout, setsockopt failed");
740 }
741
check_recv_pkts(int fd,int * correct_payload,int correct_num_pkts)742 static void check_recv_pkts(int fd, int *correct_payload,
743 int correct_num_pkts)
744 {
745 static char buffer[IP_MAXPACKET + ETH_HLEN + 1];
746 struct iphdr *iph = (struct iphdr *)(buffer + ETH_HLEN);
747 struct ipv6hdr *ip6h = (struct ipv6hdr *)(buffer + ETH_HLEN);
748 struct tcphdr *tcph;
749 bool bad_packet = false;
750 int tcp_ext_len = 0;
751 int ip_ext_len = 0;
752 int pkt_size = -1;
753 int data_len = 0;
754 int num_pkt = 0;
755 int i;
756
757 vlog("Expected {");
758 for (i = 0; i < correct_num_pkts; i++)
759 vlog("%d ", correct_payload[i]);
760 vlog("}, Total %d packets\nReceived {", correct_num_pkts);
761
762 while (1) {
763 pkt_size = recv(fd, buffer, IP_MAXPACKET + ETH_HLEN + 1, 0);
764 if (pkt_size < 0)
765 error(1, errno, "could not receive");
766
767 if (iph->version == 4)
768 ip_ext_len = (iph->ihl - 5) * 4;
769 else if (ip6h->version == 6 && ip6h->nexthdr != IPPROTO_TCP)
770 ip_ext_len = sizeof(struct ip6_frag);
771
772 tcph = (struct tcphdr *)(buffer + tcp_offset + ip_ext_len);
773
774 if (tcph->fin)
775 break;
776
777 tcp_ext_len = (tcph->doff - 5) * 4;
778 data_len = pkt_size - total_hdr_len - tcp_ext_len - ip_ext_len;
779 /* Min ethernet frame payload is 46(ETH_ZLEN - ETH_HLEN) by RFC 802.3.
780 * Ipv4/tcp packets without at least 6 bytes of data will be padded.
781 * Packet sockets are protocol agnostic, and will not trim the padding.
782 */
783 if (pkt_size == ETH_ZLEN && iph->version == 4) {
784 data_len = ntohs(iph->tot_len)
785 - sizeof(struct tcphdr) - sizeof(struct iphdr);
786 }
787 vlog("%d ", data_len);
788 if (data_len != correct_payload[num_pkt]) {
789 vlog("[!=%d]", correct_payload[num_pkt]);
790 bad_packet = true;
791 }
792 num_pkt++;
793 }
794 vlog("}, Total %d packets.\n", num_pkt);
795 if (num_pkt != correct_num_pkts)
796 error(1, 0, "incorrect number of packets");
797 if (bad_packet)
798 error(1, 0, "incorrect packet geometry");
799
800 printf("Test succeeded\n\n");
801 }
802
gro_sender(void)803 static void gro_sender(void)
804 {
805 static char fin_pkt[MAX_HDR_LEN];
806 struct sockaddr_ll daddr = {};
807 int txfd = -1;
808
809 txfd = socket(PF_PACKET, SOCK_RAW, IPPROTO_RAW);
810 if (txfd < 0)
811 error(1, errno, "socket creation");
812
813 memset(&daddr, 0, sizeof(daddr));
814 daddr.sll_ifindex = if_nametoindex(ifname);
815 if (daddr.sll_ifindex == 0)
816 error(1, errno, "if_nametoindex");
817 daddr.sll_family = AF_PACKET;
818 memcpy(daddr.sll_addr, dst_mac, ETH_ALEN);
819 daddr.sll_halen = ETH_ALEN;
820 create_packet(fin_pkt, PAYLOAD_LEN * 2, 0, 0, 1);
821
822 if (strcmp(testname, "data") == 0) {
823 send_data_pkts(txfd, &daddr, PAYLOAD_LEN, PAYLOAD_LEN);
824 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
825
826 send_data_pkts(txfd, &daddr, PAYLOAD_LEN, PAYLOAD_LEN / 2);
827 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
828
829 send_data_pkts(txfd, &daddr, PAYLOAD_LEN / 2, PAYLOAD_LEN);
830 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
831 } else if (strcmp(testname, "ack") == 0) {
832 send_ack(txfd, &daddr);
833 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
834 } else if (strcmp(testname, "flags") == 0) {
835 send_flags(txfd, &daddr, 1, 0, 0, 0);
836 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
837
838 send_flags(txfd, &daddr, 0, 1, 0, 0);
839 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
840
841 send_flags(txfd, &daddr, 0, 0, 1, 0);
842 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
843
844 send_flags(txfd, &daddr, 0, 0, 0, 1);
845 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
846 } else if (strcmp(testname, "tcp") == 0) {
847 send_changed_checksum(txfd, &daddr);
848 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
849
850 send_changed_seq(txfd, &daddr);
851 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
852
853 send_changed_ts(txfd, &daddr);
854 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
855
856 send_diff_opt(txfd, &daddr);
857 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
858 } else if (strcmp(testname, "ip") == 0) {
859 send_changed_ECN(txfd, &daddr);
860 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
861
862 send_changed_tos(txfd, &daddr);
863 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
864 if (proto == PF_INET) {
865 /* Modified packets may be received out of order.
866 * Sleep function added to enforce test boundaries
867 * so that fin pkts are not received prior to other pkts.
868 */
869 sleep(1);
870 send_changed_ttl(txfd, &daddr);
871 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
872
873 sleep(1);
874 send_ip_options(txfd, &daddr);
875 sleep(1);
876 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
877
878 sleep(1);
879 send_fragment4(txfd, &daddr);
880 sleep(1);
881 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
882 } else if (proto == PF_INET6) {
883 send_fragment6(txfd, &daddr);
884 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
885 }
886 } else if (strcmp(testname, "large") == 0) {
887 /* 20 is the difference between min iphdr size
888 * and min ipv6hdr size. Like MAX_HDR_SIZE,
889 * MAX_PAYLOAD is defined with the larger header of the two.
890 */
891 int offset = proto == PF_INET ? 20 : 0;
892 int remainder = (MAX_PAYLOAD + offset) % MSS;
893
894 send_large(txfd, &daddr, remainder);
895 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
896
897 send_large(txfd, &daddr, remainder + 1);
898 write_packet(txfd, fin_pkt, total_hdr_len, &daddr);
899 } else {
900 error(1, 0, "Unknown testcase");
901 }
902
903 if (close(txfd))
904 error(1, errno, "socket close");
905 }
906
gro_receiver(void)907 static void gro_receiver(void)
908 {
909 static int correct_payload[NUM_PACKETS];
910 int rxfd = -1;
911
912 rxfd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_NONE));
913 if (rxfd < 0)
914 error(1, 0, "socket creation");
915 setup_sock_filter(rxfd);
916 set_timeout(rxfd);
917 bind_packetsocket(rxfd);
918
919 memset(correct_payload, 0, sizeof(correct_payload));
920
921 if (strcmp(testname, "data") == 0) {
922 printf("pure data packet of same size: ");
923 correct_payload[0] = PAYLOAD_LEN * 2;
924 check_recv_pkts(rxfd, correct_payload, 1);
925
926 printf("large data packets followed by a smaller one: ");
927 correct_payload[0] = PAYLOAD_LEN * 1.5;
928 check_recv_pkts(rxfd, correct_payload, 1);
929
930 printf("small data packets followed by a larger one: ");
931 correct_payload[0] = PAYLOAD_LEN / 2;
932 correct_payload[1] = PAYLOAD_LEN;
933 check_recv_pkts(rxfd, correct_payload, 2);
934 } else if (strcmp(testname, "ack") == 0) {
935 printf("duplicate ack and pure ack: ");
936 check_recv_pkts(rxfd, correct_payload, 3);
937 } else if (strcmp(testname, "flags") == 0) {
938 correct_payload[0] = PAYLOAD_LEN * 3;
939 correct_payload[1] = PAYLOAD_LEN * 2;
940
941 printf("psh flag ends coalescing: ");
942 check_recv_pkts(rxfd, correct_payload, 2);
943
944 correct_payload[0] = PAYLOAD_LEN * 2;
945 correct_payload[1] = 0;
946 correct_payload[2] = PAYLOAD_LEN * 2;
947 printf("syn flag ends coalescing: ");
948 check_recv_pkts(rxfd, correct_payload, 3);
949
950 printf("rst flag ends coalescing: ");
951 check_recv_pkts(rxfd, correct_payload, 3);
952
953 printf("urg flag ends coalescing: ");
954 check_recv_pkts(rxfd, correct_payload, 3);
955 } else if (strcmp(testname, "tcp") == 0) {
956 correct_payload[0] = PAYLOAD_LEN;
957 correct_payload[1] = PAYLOAD_LEN;
958 correct_payload[2] = PAYLOAD_LEN;
959 correct_payload[3] = PAYLOAD_LEN;
960
961 printf("changed checksum does not coalesce: ");
962 check_recv_pkts(rxfd, correct_payload, 2);
963
964 printf("Wrong Seq number doesn't coalesce: ");
965 check_recv_pkts(rxfd, correct_payload, 2);
966
967 printf("Different timestamp doesn't coalesce: ");
968 correct_payload[0] = PAYLOAD_LEN * 2;
969 check_recv_pkts(rxfd, correct_payload, 4);
970
971 printf("Different options doesn't coalesce: ");
972 correct_payload[0] = PAYLOAD_LEN * 2;
973 check_recv_pkts(rxfd, correct_payload, 2);
974 } else if (strcmp(testname, "ip") == 0) {
975 correct_payload[0] = PAYLOAD_LEN;
976 correct_payload[1] = PAYLOAD_LEN;
977
978 printf("different ECN doesn't coalesce: ");
979 check_recv_pkts(rxfd, correct_payload, 2);
980
981 printf("different tos doesn't coalesce: ");
982 check_recv_pkts(rxfd, correct_payload, 2);
983
984 if (proto == PF_INET) {
985 printf("different ttl doesn't coalesce: ");
986 check_recv_pkts(rxfd, correct_payload, 2);
987
988 printf("ip options doesn't coalesce: ");
989 correct_payload[2] = PAYLOAD_LEN;
990 check_recv_pkts(rxfd, correct_payload, 3);
991
992 printf("fragmented ip4 doesn't coalesce: ");
993 check_recv_pkts(rxfd, correct_payload, 2);
994 } else if (proto == PF_INET6) {
995 /* GRO doesn't check for ipv6 hop limit when flushing.
996 * Hence no corresponding test to the ipv4 case.
997 */
998 printf("fragmented ip6 doesn't coalesce: ");
999 correct_payload[0] = PAYLOAD_LEN * 2;
1000 check_recv_pkts(rxfd, correct_payload, 2);
1001 }
1002 } else if (strcmp(testname, "large") == 0) {
1003 int offset = proto == PF_INET ? 20 : 0;
1004 int remainder = (MAX_PAYLOAD + offset) % MSS;
1005
1006 correct_payload[0] = (MAX_PAYLOAD + offset);
1007 correct_payload[1] = remainder;
1008 printf("Shouldn't coalesce if exceed IP max pkt size: ");
1009 check_recv_pkts(rxfd, correct_payload, 2);
1010
1011 /* last segment sent individually, doesn't start new segment */
1012 correct_payload[0] = correct_payload[0] - remainder;
1013 correct_payload[1] = remainder + 1;
1014 correct_payload[2] = remainder + 1;
1015 check_recv_pkts(rxfd, correct_payload, 3);
1016 } else {
1017 error(1, 0, "Test case error, should never trigger");
1018 }
1019
1020 if (close(rxfd))
1021 error(1, 0, "socket close");
1022 }
1023
parse_args(int argc,char ** argv)1024 static void parse_args(int argc, char **argv)
1025 {
1026 static const struct option opts[] = {
1027 { "daddr", required_argument, NULL, 'd' },
1028 { "dmac", required_argument, NULL, 'D' },
1029 { "iface", required_argument, NULL, 'i' },
1030 { "ipv4", no_argument, NULL, '4' },
1031 { "ipv6", no_argument, NULL, '6' },
1032 { "rx", no_argument, NULL, 'r' },
1033 { "saddr", required_argument, NULL, 's' },
1034 { "smac", required_argument, NULL, 'S' },
1035 { "test", required_argument, NULL, 't' },
1036 { "verbose", no_argument, NULL, 'v' },
1037 { 0, 0, 0, 0 }
1038 };
1039 int c;
1040
1041 while ((c = getopt_long(argc, argv, "46d:D:i:rs:S:t:v", opts, NULL)) != -1) {
1042 switch (c) {
1043 case '4':
1044 proto = PF_INET;
1045 ethhdr_proto = htons(ETH_P_IP);
1046 break;
1047 case '6':
1048 proto = PF_INET6;
1049 ethhdr_proto = htons(ETH_P_IPV6);
1050 break;
1051 case 'd':
1052 addr4_dst = addr6_dst = optarg;
1053 break;
1054 case 'D':
1055 dmac = optarg;
1056 break;
1057 case 'i':
1058 ifname = optarg;
1059 break;
1060 case 'r':
1061 tx_socket = false;
1062 break;
1063 case 's':
1064 addr4_src = addr6_src = optarg;
1065 break;
1066 case 'S':
1067 smac = optarg;
1068 break;
1069 case 't':
1070 testname = optarg;
1071 break;
1072 case 'v':
1073 verbose = true;
1074 break;
1075 default:
1076 error(1, 0, "%s invalid option %c\n", __func__, c);
1077 break;
1078 }
1079 }
1080 }
1081
main(int argc,char ** argv)1082 int main(int argc, char **argv)
1083 {
1084 parse_args(argc, argv);
1085
1086 if (proto == PF_INET) {
1087 tcp_offset = ETH_HLEN + sizeof(struct iphdr);
1088 total_hdr_len = tcp_offset + sizeof(struct tcphdr);
1089 } else if (proto == PF_INET6) {
1090 tcp_offset = ETH_HLEN + sizeof(struct ipv6hdr);
1091 total_hdr_len = MAX_HDR_LEN;
1092 } else {
1093 error(1, 0, "Protocol family is not ipv4 or ipv6");
1094 }
1095
1096 read_MAC(src_mac, smac);
1097 read_MAC(dst_mac, dmac);
1098
1099 if (tx_socket)
1100 gro_sender();
1101 else
1102 gro_receiver();
1103
1104 fprintf(stderr, "Gro::%s test passed.\n", testname);
1105 return 0;
1106 }
1107