summaryrefslogtreecommitdiff
path: root/lib/librte_net/rte_net.c
blob: 315c37c55112fc1ac4faac0104428ca0c06738df (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
/* SPDX-License-Identifier: BSD-3-Clause
 * Copyright 2016 6WIND S.A.
 */

#include <stdint.h>

#include <rte_mbuf.h>
#include <rte_mbuf_ptype.h>
#include <rte_byteorder.h>
#include <rte_ether.h>
#include <rte_ip.h>
#include <rte_tcp.h>
#include <rte_udp.h>
#include <rte_sctp.h>
#include <rte_gre.h>
#include <rte_mpls.h>
#include <rte_net.h>

/* get l3 packet type from ip6 next protocol */
static uint32_t
ptype_l3_ip6(uint8_t ip6_proto)
{
	static const uint32_t ip6_ext_proto_map[256] = {
		[IPPROTO_HOPOPTS] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
		[IPPROTO_ROUTING] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
		[IPPROTO_FRAGMENT] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
		[IPPROTO_ESP] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
		[IPPROTO_AH] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
		[IPPROTO_DSTOPTS] = RTE_PTYPE_L3_IPV6_EXT - RTE_PTYPE_L3_IPV6,
	};

	return RTE_PTYPE_L3_IPV6 + ip6_ext_proto_map[ip6_proto];
}

/* get l3 packet type from ip version and header length */
static uint32_t
ptype_l3_ip(uint8_t ipv_ihl)
{
	static const uint32_t ptype_l3_ip_proto_map[256] = {
		[0x45] = RTE_PTYPE_L3_IPV4,
		[0x46] = RTE_PTYPE_L3_IPV4_EXT,
		[0x47] = RTE_PTYPE_L3_IPV4_EXT,
		[0x48] = RTE_PTYPE_L3_IPV4_EXT,
		[0x49] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4A] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4B] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4C] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4D] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4E] = RTE_PTYPE_L3_IPV4_EXT,
		[0x4F] = RTE_PTYPE_L3_IPV4_EXT,
	};

	return ptype_l3_ip_proto_map[ipv_ihl];
}

/* get l4 packet type from proto */
static uint32_t
ptype_l4(uint8_t proto)
{
	static const uint32_t ptype_l4_proto[256] = {
		[IPPROTO_UDP] = RTE_PTYPE_L4_UDP,
		[IPPROTO_TCP] = RTE_PTYPE_L4_TCP,
		[IPPROTO_SCTP] = RTE_PTYPE_L4_SCTP,
	};

	return ptype_l4_proto[proto];
}

/* get inner l3 packet type from ip6 next protocol */
static uint32_t
ptype_inner_l3_ip6(uint8_t ip6_proto)
{
	static const uint32_t ptype_inner_ip6_ext_proto_map[256] = {
		[IPPROTO_HOPOPTS] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
		[IPPROTO_ROUTING] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
		[IPPROTO_FRAGMENT] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
		[IPPROTO_ESP] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
		[IPPROTO_AH] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
		[IPPROTO_DSTOPTS] = RTE_PTYPE_INNER_L3_IPV6_EXT -
			RTE_PTYPE_INNER_L3_IPV6,
	};

	return RTE_PTYPE_INNER_L3_IPV6 +
		ptype_inner_ip6_ext_proto_map[ip6_proto];
}

/* get inner l3 packet type from ip version and header length */
static uint32_t
ptype_inner_l3_ip(uint8_t ipv_ihl)
{
	static const uint32_t ptype_inner_l3_ip_proto_map[256] = {
		[0x45] = RTE_PTYPE_INNER_L3_IPV4,
		[0x46] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x47] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x48] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x49] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4A] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4B] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4C] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4D] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4E] = RTE_PTYPE_INNER_L3_IPV4_EXT,
		[0x4F] = RTE_PTYPE_INNER_L3_IPV4_EXT,
	};

	return ptype_inner_l3_ip_proto_map[ipv_ihl];
}

/* get inner l4 packet type from proto */
static uint32_t
ptype_inner_l4(uint8_t proto)
{
	static const uint32_t ptype_inner_l4_proto[256] = {
		[IPPROTO_UDP] = RTE_PTYPE_INNER_L4_UDP,
		[IPPROTO_TCP] = RTE_PTYPE_INNER_L4_TCP,
		[IPPROTO_SCTP] = RTE_PTYPE_INNER_L4_SCTP,
	};

	return ptype_inner_l4_proto[proto];
}

/* get the tunnel packet type if any, update proto and off. */
static uint32_t
ptype_tunnel(uint16_t *proto, const struct rte_mbuf *m,
	uint32_t *off)
{
	switch (*proto) {
	case IPPROTO_GRE: {
		static const uint8_t opt_len[16] = {
			[0x0] = 4,
			[0x1] = 8,
			[0x2] = 8,
			[0x8] = 8,
			[0x3] = 12,
			[0x9] = 12,
			[0xa] = 12,
			[0xb] = 16,
		};
		const struct gre_hdr *gh;
		struct gre_hdr gh_copy;
		uint16_t flags;

		gh = rte_pktmbuf_read(m, *off, sizeof(*gh), &gh_copy);
		if (unlikely(gh == NULL))
			return 0;

		flags = rte_be_to_cpu_16(*(const uint16_t *)gh);
		flags >>= 12;
		if (opt_len[flags] == 0)
			return 0;

		*off += opt_len[flags];
		*proto = gh->proto;
		if (*proto == rte_cpu_to_be_16(ETHER_TYPE_TEB))
			return RTE_PTYPE_TUNNEL_NVGRE;
		else
			return RTE_PTYPE_TUNNEL_GRE;
	}
	case IPPROTO_IPIP:
		*proto = rte_cpu_to_be_16(ETHER_TYPE_IPv4);
		return RTE_PTYPE_TUNNEL_IP;
	case IPPROTO_IPV6:
		*proto = rte_cpu_to_be_16(ETHER_TYPE_IPv6);
		return RTE_PTYPE_TUNNEL_IP; /* IP is also valid for IPv6 */
	default:
		return 0;
	}
}

/* get the ipv4 header length */
static uint8_t
ip4_hlen(const struct ipv4_hdr *hdr)
{
	return (hdr->version_ihl & 0xf) * 4;
}

/* parse ipv6 extended headers, update offset and return next proto */
int __rte_experimental
rte_net_skip_ip6_ext(uint16_t proto, const struct rte_mbuf *m, uint32_t *off,
	int *frag)
{
	struct ext_hdr {
		uint8_t next_hdr;
		uint8_t len;
	};
	const struct ext_hdr *xh;
	struct ext_hdr xh_copy;
	unsigned int i;

	*frag = 0;

#define MAX_EXT_HDRS 5
	for (i = 0; i < MAX_EXT_HDRS; i++) {
		switch (proto) {
		case IPPROTO_HOPOPTS:
		case IPPROTO_ROUTING:
		case IPPROTO_DSTOPTS:
			xh = rte_pktmbuf_read(m, *off, sizeof(*xh),
				&xh_copy);
			if (xh == NULL)
				return -1;
			*off += (xh->len + 1) * 8;
			proto = xh->next_hdr;
			break;
		case IPPROTO_FRAGMENT:
			xh = rte_pktmbuf_read(m, *off, sizeof(*xh),
				&xh_copy);
			if (xh == NULL)
				return -1;
			*off += 8;
			proto = xh->next_hdr;
			*frag = 1;
			return proto; /* this is always the last ext hdr */
		case IPPROTO_NONE:
			return 0;
		default:
			return proto;
		}
	}
	return -1;
}

/* parse mbuf data to get packet type */
uint32_t rte_net_get_ptype(const struct rte_mbuf *m,
	struct rte_net_hdr_lens *hdr_lens, uint32_t layers)
{
	struct rte_net_hdr_lens local_hdr_lens;
	const struct rte_ether_hdr *eh;
	struct rte_ether_hdr eh_copy;
	uint32_t pkt_type = RTE_PTYPE_L2_ETHER;
	uint32_t off = 0;
	uint16_t proto;
	int ret;

	if (hdr_lens == NULL)
		hdr_lens = &local_hdr_lens;

	eh = rte_pktmbuf_read(m, off, sizeof(*eh), &eh_copy);
	if (unlikely(eh == NULL))
		return 0;
	proto = eh->ether_type;
	off = sizeof(*eh);
	hdr_lens->l2_len = off;

	if ((layers & RTE_PTYPE_L2_MASK) == 0)
		return 0;

	if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv4))
		goto l3; /* fast path if packet is IPv4 */

	if (proto == rte_cpu_to_be_16(ETHER_TYPE_VLAN)) {
		const struct rte_vlan_hdr *vh;
		struct rte_vlan_hdr vh_copy;

		pkt_type = RTE_PTYPE_L2_ETHER_VLAN;
		vh = rte_pktmbuf_read(m, off, sizeof(*vh), &vh_copy);
		if (unlikely(vh == NULL))
			return pkt_type;
		off += sizeof(*vh);
		hdr_lens->l2_len += sizeof(*vh);
		proto = vh->eth_proto;
	} else if (proto == rte_cpu_to_be_16(ETHER_TYPE_QINQ)) {
		const struct rte_vlan_hdr *vh;
		struct rte_vlan_hdr vh_copy;

		pkt_type = RTE_PTYPE_L2_ETHER_QINQ;
		vh = rte_pktmbuf_read(m, off + sizeof(*vh), sizeof(*vh),
			&vh_copy);
		if (unlikely(vh == NULL))
			return pkt_type;
		off += 2 * sizeof(*vh);
		hdr_lens->l2_len += 2 * sizeof(*vh);
		proto = vh->eth_proto;
	} else if ((proto == rte_cpu_to_be_16(ETHER_TYPE_MPLS)) ||
		(proto == rte_cpu_to_be_16(ETHER_TYPE_MPLSM))) {
		unsigned int i;
		const struct mpls_hdr *mh;
		struct mpls_hdr mh_copy;

#define MAX_MPLS_HDR 5
		for (i = 0; i < MAX_MPLS_HDR; i++) {
			mh = rte_pktmbuf_read(m, off + (i * sizeof(*mh)),
				sizeof(*mh), &mh_copy);
			if (unlikely(mh == NULL))
				return pkt_type;
		}
		if (i == MAX_MPLS_HDR)
			return pkt_type;
		pkt_type = RTE_PTYPE_L2_ETHER_MPLS;
		hdr_lens->l2_len += (sizeof(*mh) * i);
		return pkt_type;
	}

l3:
	if ((layers & RTE_PTYPE_L3_MASK) == 0)
		return pkt_type;

	if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv4)) {
		const struct ipv4_hdr *ip4h;
		struct ipv4_hdr ip4h_copy;

		ip4h = rte_pktmbuf_read(m, off, sizeof(*ip4h), &ip4h_copy);
		if (unlikely(ip4h == NULL))
			return pkt_type;

		pkt_type |= ptype_l3_ip(ip4h->version_ihl);
		hdr_lens->l3_len = ip4_hlen(ip4h);
		off += hdr_lens->l3_len;

		if ((layers & RTE_PTYPE_L4_MASK) == 0)
			return pkt_type;

		if (ip4h->fragment_offset & rte_cpu_to_be_16(
				IPV4_HDR_OFFSET_MASK | IPV4_HDR_MF_FLAG)) {
			pkt_type |= RTE_PTYPE_L4_FRAG;
			hdr_lens->l4_len = 0;
			return pkt_type;
		}
		proto = ip4h->next_proto_id;
		pkt_type |= ptype_l4(proto);
	} else if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv6)) {
		const struct ipv6_hdr *ip6h;
		struct ipv6_hdr ip6h_copy;
		int frag = 0;

		ip6h = rte_pktmbuf_read(m, off, sizeof(*ip6h), &ip6h_copy);
		if (unlikely(ip6h == NULL))
			return pkt_type;

		proto = ip6h->proto;
		hdr_lens->l3_len = sizeof(*ip6h);
		off += hdr_lens->l3_len;
		pkt_type |= ptype_l3_ip6(proto);
		if ((pkt_type & RTE_PTYPE_L3_MASK) == RTE_PTYPE_L3_IPV6_EXT) {
			ret = rte_net_skip_ip6_ext(proto, m, &off, &frag);
			if (ret < 0)
				return pkt_type;
			proto = ret;
			hdr_lens->l3_len = off - hdr_lens->l2_len;
		}
		if (proto == 0)
			return pkt_type;

		if ((layers & RTE_PTYPE_L4_MASK) == 0)
			return pkt_type;

		if (frag) {
			pkt_type |= RTE_PTYPE_L4_FRAG;
			hdr_lens->l4_len = 0;
			return pkt_type;
		}
		pkt_type |= ptype_l4(proto);
	}

	if ((pkt_type & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_UDP) {
		hdr_lens->l4_len = sizeof(struct udp_hdr);
		return pkt_type;
	} else if ((pkt_type & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_TCP) {
		const struct tcp_hdr *th;
		struct tcp_hdr th_copy;

		th = rte_pktmbuf_read(m, off, sizeof(*th), &th_copy);
		if (unlikely(th == NULL))
			return pkt_type & (RTE_PTYPE_L2_MASK |
				RTE_PTYPE_L3_MASK);
		hdr_lens->l4_len = (th->data_off & 0xf0) >> 2;
		return pkt_type;
	} else if ((pkt_type & RTE_PTYPE_L4_MASK) == RTE_PTYPE_L4_SCTP) {
		hdr_lens->l4_len = sizeof(struct sctp_hdr);
		return pkt_type;
	} else {
		uint32_t prev_off = off;

		hdr_lens->l4_len = 0;

		if ((layers & RTE_PTYPE_TUNNEL_MASK) == 0)
			return pkt_type;

		pkt_type |= ptype_tunnel(&proto, m, &off);
		hdr_lens->tunnel_len = off - prev_off;
	}

	/* same job for inner header: we need to duplicate the code
	 * because the packet types do not have the same value.
	 */
	if ((layers & RTE_PTYPE_INNER_L2_MASK) == 0)
		return pkt_type;

	hdr_lens->inner_l2_len = 0;
	if (proto == rte_cpu_to_be_16(ETHER_TYPE_TEB)) {
		eh = rte_pktmbuf_read(m, off, sizeof(*eh), &eh_copy);
		if (unlikely(eh == NULL))
			return pkt_type;
		pkt_type |= RTE_PTYPE_INNER_L2_ETHER;
		proto = eh->ether_type;
		off += sizeof(*eh);
		hdr_lens->inner_l2_len = sizeof(*eh);
	}

	if (proto == rte_cpu_to_be_16(ETHER_TYPE_VLAN)) {
		const struct rte_vlan_hdr *vh;
		struct rte_vlan_hdr vh_copy;

		pkt_type &= ~RTE_PTYPE_INNER_L2_MASK;
		pkt_type |= RTE_PTYPE_INNER_L2_ETHER_VLAN;
		vh = rte_pktmbuf_read(m, off, sizeof(*vh), &vh_copy);
		if (unlikely(vh == NULL))
			return pkt_type;
		off += sizeof(*vh);
		hdr_lens->inner_l2_len += sizeof(*vh);
		proto = vh->eth_proto;
	} else if (proto == rte_cpu_to_be_16(ETHER_TYPE_QINQ)) {
		const struct rte_vlan_hdr *vh;
		struct rte_vlan_hdr vh_copy;

		pkt_type &= ~RTE_PTYPE_INNER_L2_MASK;
		pkt_type |= RTE_PTYPE_INNER_L2_ETHER_QINQ;
		vh = rte_pktmbuf_read(m, off + sizeof(*vh), sizeof(*vh),
			&vh_copy);
		if (unlikely(vh == NULL))
			return pkt_type;
		off += 2 * sizeof(*vh);
		hdr_lens->inner_l2_len += 2 * sizeof(*vh);
		proto = vh->eth_proto;
	}

	if ((layers & RTE_PTYPE_INNER_L3_MASK) == 0)
		return pkt_type;

	if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv4)) {
		const struct ipv4_hdr *ip4h;
		struct ipv4_hdr ip4h_copy;

		ip4h = rte_pktmbuf_read(m, off, sizeof(*ip4h), &ip4h_copy);
		if (unlikely(ip4h == NULL))
			return pkt_type;

		pkt_type |= ptype_inner_l3_ip(ip4h->version_ihl);
		hdr_lens->inner_l3_len = ip4_hlen(ip4h);
		off += hdr_lens->inner_l3_len;

		if ((layers & RTE_PTYPE_INNER_L4_MASK) == 0)
			return pkt_type;
		if (ip4h->fragment_offset &
				rte_cpu_to_be_16(IPV4_HDR_OFFSET_MASK |
					IPV4_HDR_MF_FLAG)) {
			pkt_type |= RTE_PTYPE_INNER_L4_FRAG;
			hdr_lens->inner_l4_len = 0;
			return pkt_type;
		}
		proto = ip4h->next_proto_id;
		pkt_type |= ptype_inner_l4(proto);
	} else if (proto == rte_cpu_to_be_16(ETHER_TYPE_IPv6)) {
		const struct ipv6_hdr *ip6h;
		struct ipv6_hdr ip6h_copy;
		int frag = 0;

		ip6h = rte_pktmbuf_read(m, off, sizeof(*ip6h), &ip6h_copy);
		if (unlikely(ip6h == NULL))
			return pkt_type;

		proto = ip6h->proto;
		hdr_lens->inner_l3_len = sizeof(*ip6h);
		off += hdr_lens->inner_l3_len;
		pkt_type |= ptype_inner_l3_ip6(proto);
		if ((pkt_type & RTE_PTYPE_INNER_L3_MASK) ==
				RTE_PTYPE_INNER_L3_IPV6_EXT) {
			uint32_t prev_off;

			prev_off = off;
			ret = rte_net_skip_ip6_ext(proto, m, &off, &frag);
			if (ret < 0)
				return pkt_type;
			proto = ret;
			hdr_lens->inner_l3_len += off - prev_off;
		}
		if (proto == 0)
			return pkt_type;

		if ((layers & RTE_PTYPE_INNER_L4_MASK) == 0)
			return pkt_type;

		if (frag) {
			pkt_type |= RTE_PTYPE_INNER_L4_FRAG;
			hdr_lens->inner_l4_len = 0;
			return pkt_type;
		}
		pkt_type |= ptype_inner_l4(proto);
	}

	if ((pkt_type & RTE_PTYPE_INNER_L4_MASK) == RTE_PTYPE_INNER_L4_UDP) {
		hdr_lens->inner_l4_len = sizeof(struct udp_hdr);
	} else if ((pkt_type & RTE_PTYPE_INNER_L4_MASK) ==
			RTE_PTYPE_INNER_L4_TCP) {
		const struct tcp_hdr *th;
		struct tcp_hdr th_copy;

		th = rte_pktmbuf_read(m, off, sizeof(*th), &th_copy);
		if (unlikely(th == NULL))
			return pkt_type & (RTE_PTYPE_INNER_L2_MASK |
				RTE_PTYPE_INNER_L3_MASK);
		hdr_lens->inner_l4_len = (th->data_off & 0xf0) >> 2;
	} else if ((pkt_type & RTE_PTYPE_INNER_L4_MASK) ==
			RTE_PTYPE_INNER_L4_SCTP) {
		hdr_lens->inner_l4_len = sizeof(struct sctp_hdr);
	} else {
		hdr_lens->inner_l4_len = 0;
	}

	return pkt_type;
}