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1/*
2 * Copyright (c) 2007-2014 Nicira, Inc.
3 *
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
12 *
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
16 * 02110-1301, USA
17 */
18
19#include <linux/uaccess.h>
20#include <linux/netdevice.h>
21#include <linux/etherdevice.h>
22#include <linux/if_ether.h>
23#include <linux/if_vlan.h>
24#include <net/llc_pdu.h>
25#include <linux/kernel.h>
26#include <linux/jhash.h>
27#include <linux/jiffies.h>
28#include <linux/llc.h>
29#include <linux/module.h>
30#include <linux/in.h>
31#include <linux/rcupdate.h>
32#include <linux/cpumask.h>
33#include <linux/if_arp.h>
34#include <linux/ip.h>
35#include <linux/ipv6.h>
36#include <linux/mpls.h>
37#include <linux/sctp.h>
38#include <linux/smp.h>
39#include <linux/tcp.h>
40#include <linux/udp.h>
41#include <linux/icmp.h>
42#include <linux/icmpv6.h>
43#include <linux/rculist.h>
44#include <net/ip.h>
45#include <net/ip_tunnels.h>
46#include <net/ipv6.h>
47#include <net/mpls.h>
48#include <net/ndisc.h>
49#include <net/nsh.h>
50
51#include "conntrack.h"
52#include "datapath.h"
53#include "flow.h"
54#include "flow_netlink.h"
55#include "vport.h"
56
57u64 ovs_flow_used_time(unsigned long flow_jiffies)
58{
59 struct timespec64 cur_ts;
60 u64 cur_ms, idle_ms;
61
62 ktime_get_ts64(&cur_ts);
63 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
64 cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
65 cur_ts.tv_nsec / NSEC_PER_MSEC;
66
67 return cur_ms - idle_ms;
68}
69
70#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
71
72void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
73 const struct sk_buff *skb)
74{
75 struct flow_stats *stats;
76 unsigned int cpu = smp_processor_id();
77 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
78
79 stats = rcu_dereference(flow->stats[cpu]);
80
81 /* Check if already have CPU-specific stats. */
82 if (likely(stats)) {
83 spin_lock(&stats->lock);
84 /* Mark if we write on the pre-allocated stats. */
85 if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
86 flow->stats_last_writer = cpu;
87 } else {
88 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
89 spin_lock(&stats->lock);
90
91 /* If the current CPU is the only writer on the
92 * pre-allocated stats keep using them.
93 */
94 if (unlikely(flow->stats_last_writer != cpu)) {
95 /* A previous locker may have already allocated the
96 * stats, so we need to check again. If CPU-specific
97 * stats were already allocated, we update the pre-
98 * allocated stats as we have already locked them.
99 */
100 if (likely(flow->stats_last_writer != -1) &&
101 likely(!rcu_access_pointer(flow->stats[cpu]))) {
102 /* Try to allocate CPU-specific stats. */
103 struct flow_stats *new_stats;
104
105 new_stats =
106 kmem_cache_alloc_node(flow_stats_cache,
107 GFP_NOWAIT |
108 __GFP_THISNODE |
109 __GFP_NOWARN |
110 __GFP_NOMEMALLOC,
111 numa_node_id());
112 if (likely(new_stats)) {
113 new_stats->used = jiffies;
114 new_stats->packet_count = 1;
115 new_stats->byte_count = len;
116 new_stats->tcp_flags = tcp_flags;
117 spin_lock_init(&new_stats->lock);
118
119 rcu_assign_pointer(flow->stats[cpu],
120 new_stats);
121 cpumask_set_cpu(cpu, &flow->cpu_used_mask);
122 goto unlock;
123 }
124 }
125 flow->stats_last_writer = cpu;
126 }
127 }
128
129 stats->used = jiffies;
130 stats->packet_count++;
131 stats->byte_count += len;
132 stats->tcp_flags |= tcp_flags;
133unlock:
134 spin_unlock(&stats->lock);
135}
136
137/* Must be called with rcu_read_lock or ovs_mutex. */
138void ovs_flow_stats_get(const struct sw_flow *flow,
139 struct ovs_flow_stats *ovs_stats,
140 unsigned long *used, __be16 *tcp_flags)
141{
142 int cpu;
143
144 *used = 0;
145 *tcp_flags = 0;
146 memset(ovs_stats, 0, sizeof(*ovs_stats));
147
148 /* We open code this to make sure cpu 0 is always considered */
149 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
150 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
151
152 if (stats) {
153 /* Local CPU may write on non-local stats, so we must
154 * block bottom-halves here.
155 */
156 spin_lock_bh(&stats->lock);
157 if (!*used || time_after(stats->used, *used))
158 *used = stats->used;
159 *tcp_flags |= stats->tcp_flags;
160 ovs_stats->n_packets += stats->packet_count;
161 ovs_stats->n_bytes += stats->byte_count;
162 spin_unlock_bh(&stats->lock);
163 }
164 }
165}
166
167/* Called with ovs_mutex. */
168void ovs_flow_stats_clear(struct sw_flow *flow)
169{
170 int cpu;
171
172 /* We open code this to make sure cpu 0 is always considered */
173 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
174 struct flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
175
176 if (stats) {
177 spin_lock_bh(&stats->lock);
178 stats->used = 0;
179 stats->packet_count = 0;
180 stats->byte_count = 0;
181 stats->tcp_flags = 0;
182 spin_unlock_bh(&stats->lock);
183 }
184 }
185}
186
187static int check_header(struct sk_buff *skb, int len)
188{
189 if (unlikely(skb->len < len))
190 return -EINVAL;
191 if (unlikely(!pskb_may_pull(skb, len)))
192 return -ENOMEM;
193 return 0;
194}
195
196static bool arphdr_ok(struct sk_buff *skb)
197{
198 return pskb_may_pull(skb, skb_network_offset(skb) +
199 sizeof(struct arp_eth_header));
200}
201
202static int check_iphdr(struct sk_buff *skb)
203{
204 unsigned int nh_ofs = skb_network_offset(skb);
205 unsigned int ip_len;
206 int err;
207
208 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
209 if (unlikely(err))
210 return err;
211
212 ip_len = ip_hdrlen(skb);
213 if (unlikely(ip_len < sizeof(struct iphdr) ||
214 skb->len < nh_ofs + ip_len))
215 return -EINVAL;
216
217 skb_set_transport_header(skb, nh_ofs + ip_len);
218 return 0;
219}
220
221static bool tcphdr_ok(struct sk_buff *skb)
222{
223 int th_ofs = skb_transport_offset(skb);
224 int tcp_len;
225
226 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
227 return false;
228
229 tcp_len = tcp_hdrlen(skb);
230 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
231 skb->len < th_ofs + tcp_len))
232 return false;
233
234 return true;
235}
236
237static bool udphdr_ok(struct sk_buff *skb)
238{
239 return pskb_may_pull(skb, skb_transport_offset(skb) +
240 sizeof(struct udphdr));
241}
242
243static bool sctphdr_ok(struct sk_buff *skb)
244{
245 return pskb_may_pull(skb, skb_transport_offset(skb) +
246 sizeof(struct sctphdr));
247}
248
249static bool icmphdr_ok(struct sk_buff *skb)
250{
251 return pskb_may_pull(skb, skb_transport_offset(skb) +
252 sizeof(struct icmphdr));
253}
254
255static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
256{
257 unsigned int nh_ofs = skb_network_offset(skb);
258 unsigned int nh_len;
259 int payload_ofs;
260 struct ipv6hdr *nh;
261 uint8_t nexthdr;
262 __be16 frag_off;
263 int err;
264
265 err = check_header(skb, nh_ofs + sizeof(*nh));
266 if (unlikely(err))
267 return err;
268
269 nh = ipv6_hdr(skb);
270 nexthdr = nh->nexthdr;
271 payload_ofs = (u8 *)(nh + 1) - skb->data;
272
273 key->ip.proto = NEXTHDR_NONE;
274 key->ip.tos = ipv6_get_dsfield(nh);
275 key->ip.ttl = nh->hop_limit;
276 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
277 key->ipv6.addr.src = nh->saddr;
278 key->ipv6.addr.dst = nh->daddr;
279
280 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
281
282 if (frag_off) {
283 if (frag_off & htons(~0x7))
284 key->ip.frag = OVS_FRAG_TYPE_LATER;
285 else
286 key->ip.frag = OVS_FRAG_TYPE_FIRST;
287 } else {
288 key->ip.frag = OVS_FRAG_TYPE_NONE;
289 }
290
291 /* Delayed handling of error in ipv6_skip_exthdr() as it
292 * always sets frag_off to a valid value which may be
293 * used to set key->ip.frag above.
294 */
295 if (unlikely(payload_ofs < 0))
296 return -EPROTO;
297
298 nh_len = payload_ofs - nh_ofs;
299 skb_set_transport_header(skb, nh_ofs + nh_len);
300 key->ip.proto = nexthdr;
301 return nh_len;
302}
303
304static bool icmp6hdr_ok(struct sk_buff *skb)
305{
306 return pskb_may_pull(skb, skb_transport_offset(skb) +
307 sizeof(struct icmp6hdr));
308}
309
310/**
311 * Parse vlan tag from vlan header.
312 * Returns ERROR on memory error.
313 * Returns 0 if it encounters a non-vlan or incomplete packet.
314 * Returns 1 after successfully parsing vlan tag.
315 */
316static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
317 bool untag_vlan)
318{
319 struct vlan_head *vh = (struct vlan_head *)skb->data;
320
321 if (likely(!eth_type_vlan(vh->tpid)))
322 return 0;
323
324 if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
325 return 0;
326
327 if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
328 sizeof(__be16))))
329 return -ENOMEM;
330
331 vh = (struct vlan_head *)skb->data;
332 key_vh->tci = vh->tci | htons(VLAN_TAG_PRESENT);
333 key_vh->tpid = vh->tpid;
334
335 if (unlikely(untag_vlan)) {
336 int offset = skb->data - skb_mac_header(skb);
337 u16 tci;
338 int err;
339
340 __skb_push(skb, offset);
341 err = __skb_vlan_pop(skb, &tci);
342 __skb_pull(skb, offset);
343 if (err)
344 return err;
345 __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
346 } else {
347 __skb_pull(skb, sizeof(struct vlan_head));
348 }
349 return 1;
350}
351
352static void clear_vlan(struct sw_flow_key *key)
353{
354 key->eth.vlan.tci = 0;
355 key->eth.vlan.tpid = 0;
356 key->eth.cvlan.tci = 0;
357 key->eth.cvlan.tpid = 0;
358}
359
360static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
361{
362 int res;
363
364 if (skb_vlan_tag_present(skb)) {
365 key->eth.vlan.tci = htons(skb->vlan_tci);
366 key->eth.vlan.tpid = skb->vlan_proto;
367 } else {
368 /* Parse outer vlan tag in the non-accelerated case. */
369 res = parse_vlan_tag(skb, &key->eth.vlan, true);
370 if (res <= 0)
371 return res;
372 }
373
374 /* Parse inner vlan tag. */
375 res = parse_vlan_tag(skb, &key->eth.cvlan, false);
376 if (res <= 0)
377 return res;
378
379 return 0;
380}
381
382static __be16 parse_ethertype(struct sk_buff *skb)
383{
384 struct llc_snap_hdr {
385 u8 dsap; /* Always 0xAA */
386 u8 ssap; /* Always 0xAA */
387 u8 ctrl;
388 u8 oui[3];
389 __be16 ethertype;
390 };
391 struct llc_snap_hdr *llc;
392 __be16 proto;
393
394 proto = *(__be16 *) skb->data;
395 __skb_pull(skb, sizeof(__be16));
396
397 if (eth_proto_is_802_3(proto))
398 return proto;
399
400 if (skb->len < sizeof(struct llc_snap_hdr))
401 return htons(ETH_P_802_2);
402
403 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
404 return htons(0);
405
406 llc = (struct llc_snap_hdr *) skb->data;
407 if (llc->dsap != LLC_SAP_SNAP ||
408 llc->ssap != LLC_SAP_SNAP ||
409 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
410 return htons(ETH_P_802_2);
411
412 __skb_pull(skb, sizeof(struct llc_snap_hdr));
413
414 if (eth_proto_is_802_3(llc->ethertype))
415 return llc->ethertype;
416
417 return htons(ETH_P_802_2);
418}
419
420static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
421 int nh_len)
422{
423 struct icmp6hdr *icmp = icmp6_hdr(skb);
424
425 /* The ICMPv6 type and code fields use the 16-bit transport port
426 * fields, so we need to store them in 16-bit network byte order.
427 */
428 key->tp.src = htons(icmp->icmp6_type);
429 key->tp.dst = htons(icmp->icmp6_code);
430 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
431
432 if (icmp->icmp6_code == 0 &&
433 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
434 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
435 int icmp_len = skb->len - skb_transport_offset(skb);
436 struct nd_msg *nd;
437 int offset;
438
439 /* In order to process neighbor discovery options, we need the
440 * entire packet.
441 */
442 if (unlikely(icmp_len < sizeof(*nd)))
443 return 0;
444
445 if (unlikely(skb_linearize(skb)))
446 return -ENOMEM;
447
448 nd = (struct nd_msg *)skb_transport_header(skb);
449 key->ipv6.nd.target = nd->target;
450
451 icmp_len -= sizeof(*nd);
452 offset = 0;
453 while (icmp_len >= 8) {
454 struct nd_opt_hdr *nd_opt =
455 (struct nd_opt_hdr *)(nd->opt + offset);
456 int opt_len = nd_opt->nd_opt_len * 8;
457
458 if (unlikely(!opt_len || opt_len > icmp_len))
459 return 0;
460
461 /* Store the link layer address if the appropriate
462 * option is provided. It is considered an error if
463 * the same link layer option is specified twice.
464 */
465 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
466 && opt_len == 8) {
467 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
468 goto invalid;
469 ether_addr_copy(key->ipv6.nd.sll,
470 &nd->opt[offset+sizeof(*nd_opt)]);
471 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
472 && opt_len == 8) {
473 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
474 goto invalid;
475 ether_addr_copy(key->ipv6.nd.tll,
476 &nd->opt[offset+sizeof(*nd_opt)]);
477 }
478
479 icmp_len -= opt_len;
480 offset += opt_len;
481 }
482 }
483
484 return 0;
485
486invalid:
487 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
488 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
489 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
490
491 return 0;
492}
493
494static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
495{
496 struct nshhdr *nh;
497 unsigned int nh_ofs = skb_network_offset(skb);
498 u8 version, length;
499 int err;
500
501 err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
502 if (unlikely(err))
503 return err;
504
505 nh = nsh_hdr(skb);
506 version = nsh_get_ver(nh);
507 length = nsh_hdr_len(nh);
508
509 if (version != 0)
510 return -EINVAL;
511
512 err = check_header(skb, nh_ofs + length);
513 if (unlikely(err))
514 return err;
515
516 nh = nsh_hdr(skb);
517 key->nsh.base.flags = nsh_get_flags(nh);
518 key->nsh.base.ttl = nsh_get_ttl(nh);
519 key->nsh.base.mdtype = nh->mdtype;
520 key->nsh.base.np = nh->np;
521 key->nsh.base.path_hdr = nh->path_hdr;
522 switch (key->nsh.base.mdtype) {
523 case NSH_M_TYPE1:
524 if (length != NSH_M_TYPE1_LEN)
525 return -EINVAL;
526 memcpy(key->nsh.context, nh->md1.context,
527 sizeof(nh->md1));
528 break;
529 case NSH_M_TYPE2:
530 memset(key->nsh.context, 0,
531 sizeof(nh->md1));
532 break;
533 default:
534 return -EINVAL;
535 }
536
537 return 0;
538}
539
540/**
541 * key_extract - extracts a flow key from an Ethernet frame.
542 * @skb: sk_buff that contains the frame, with skb->data pointing to the
543 * Ethernet header
544 * @key: output flow key
545 *
546 * The caller must ensure that skb->len >= ETH_HLEN.
547 *
548 * Returns 0 if successful, otherwise a negative errno value.
549 *
550 * Initializes @skb header fields as follows:
551 *
552 * - skb->mac_header: the L2 header.
553 *
554 * - skb->network_header: just past the L2 header, or just past the
555 * VLAN header, to the first byte of the L2 payload.
556 *
557 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
558 * on output, then just past the IP header, if one is present and
559 * of a correct length, otherwise the same as skb->network_header.
560 * For other key->eth.type values it is left untouched.
561 *
562 * - skb->protocol: the type of the data starting at skb->network_header.
563 * Equals to key->eth.type.
564 */
565static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
566{
567 int error;
568 struct ethhdr *eth;
569
570 /* Flags are always used as part of stats */
571 key->tp.flags = 0;
572
573 skb_reset_mac_header(skb);
574
575 /* Link layer. */
576 clear_vlan(key);
577 if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
578 if (unlikely(eth_type_vlan(skb->protocol)))
579 return -EINVAL;
580
581 skb_reset_network_header(skb);
582 key->eth.type = skb->protocol;
583 } else {
584 eth = eth_hdr(skb);
585 ether_addr_copy(key->eth.src, eth->h_source);
586 ether_addr_copy(key->eth.dst, eth->h_dest);
587
588 __skb_pull(skb, 2 * ETH_ALEN);
589 /* We are going to push all headers that we pull, so no need to
590 * update skb->csum here.
591 */
592
593 if (unlikely(parse_vlan(skb, key)))
594 return -ENOMEM;
595
596 key->eth.type = parse_ethertype(skb);
597 if (unlikely(key->eth.type == htons(0)))
598 return -ENOMEM;
599
600 /* Multiple tagged packets need to retain TPID to satisfy
601 * skb_vlan_pop(), which will later shift the ethertype into
602 * skb->protocol.
603 */
604 if (key->eth.cvlan.tci & htons(VLAN_TAG_PRESENT))
605 skb->protocol = key->eth.cvlan.tpid;
606 else
607 skb->protocol = key->eth.type;
608
609 skb_reset_network_header(skb);
610 __skb_push(skb, skb->data - skb_mac_header(skb));
611 }
612 skb_reset_mac_len(skb);
613
614 /* Network layer. */
615 if (key->eth.type == htons(ETH_P_IP)) {
616 struct iphdr *nh;
617 __be16 offset;
618
619 error = check_iphdr(skb);
620 if (unlikely(error)) {
621 memset(&key->ip, 0, sizeof(key->ip));
622 memset(&key->ipv4, 0, sizeof(key->ipv4));
623 if (error == -EINVAL) {
624 skb->transport_header = skb->network_header;
625 error = 0;
626 }
627 return error;
628 }
629
630 nh = ip_hdr(skb);
631 key->ipv4.addr.src = nh->saddr;
632 key->ipv4.addr.dst = nh->daddr;
633
634 key->ip.proto = nh->protocol;
635 key->ip.tos = nh->tos;
636 key->ip.ttl = nh->ttl;
637
638 offset = nh->frag_off & htons(IP_OFFSET);
639 if (offset) {
640 key->ip.frag = OVS_FRAG_TYPE_LATER;
641 return 0;
642 }
643 if (nh->frag_off & htons(IP_MF) ||
644 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
645 key->ip.frag = OVS_FRAG_TYPE_FIRST;
646 else
647 key->ip.frag = OVS_FRAG_TYPE_NONE;
648
649 /* Transport layer. */
650 if (key->ip.proto == IPPROTO_TCP) {
651 if (tcphdr_ok(skb)) {
652 struct tcphdr *tcp = tcp_hdr(skb);
653 key->tp.src = tcp->source;
654 key->tp.dst = tcp->dest;
655 key->tp.flags = TCP_FLAGS_BE16(tcp);
656 } else {
657 memset(&key->tp, 0, sizeof(key->tp));
658 }
659
660 } else if (key->ip.proto == IPPROTO_UDP) {
661 if (udphdr_ok(skb)) {
662 struct udphdr *udp = udp_hdr(skb);
663 key->tp.src = udp->source;
664 key->tp.dst = udp->dest;
665 } else {
666 memset(&key->tp, 0, sizeof(key->tp));
667 }
668 } else if (key->ip.proto == IPPROTO_SCTP) {
669 if (sctphdr_ok(skb)) {
670 struct sctphdr *sctp = sctp_hdr(skb);
671 key->tp.src = sctp->source;
672 key->tp.dst = sctp->dest;
673 } else {
674 memset(&key->tp, 0, sizeof(key->tp));
675 }
676 } else if (key->ip.proto == IPPROTO_ICMP) {
677 if (icmphdr_ok(skb)) {
678 struct icmphdr *icmp = icmp_hdr(skb);
679 /* The ICMP type and code fields use the 16-bit
680 * transport port fields, so we need to store
681 * them in 16-bit network byte order. */
682 key->tp.src = htons(icmp->type);
683 key->tp.dst = htons(icmp->code);
684 } else {
685 memset(&key->tp, 0, sizeof(key->tp));
686 }
687 }
688
689 } else if (key->eth.type == htons(ETH_P_ARP) ||
690 key->eth.type == htons(ETH_P_RARP)) {
691 struct arp_eth_header *arp;
692 bool arp_available = arphdr_ok(skb);
693
694 arp = (struct arp_eth_header *)skb_network_header(skb);
695
696 if (arp_available &&
697 arp->ar_hrd == htons(ARPHRD_ETHER) &&
698 arp->ar_pro == htons(ETH_P_IP) &&
699 arp->ar_hln == ETH_ALEN &&
700 arp->ar_pln == 4) {
701
702 /* We only match on the lower 8 bits of the opcode. */
703 if (ntohs(arp->ar_op) <= 0xff)
704 key->ip.proto = ntohs(arp->ar_op);
705 else
706 key->ip.proto = 0;
707
708 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
709 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
710 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
711 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
712 } else {
713 memset(&key->ip, 0, sizeof(key->ip));
714 memset(&key->ipv4, 0, sizeof(key->ipv4));
715 }
716 } else if (eth_p_mpls(key->eth.type)) {
717 size_t stack_len = MPLS_HLEN;
718
719 skb_set_inner_network_header(skb, skb->mac_len);
720 while (1) {
721 __be32 lse;
722
723 error = check_header(skb, skb->mac_len + stack_len);
724 if (unlikely(error))
725 return 0;
726
727 memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
728
729 if (stack_len == MPLS_HLEN)
730 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
731
732 skb_set_inner_network_header(skb, skb->mac_len + stack_len);
733 if (lse & htonl(MPLS_LS_S_MASK))
734 break;
735
736 stack_len += MPLS_HLEN;
737 }
738 } else if (key->eth.type == htons(ETH_P_IPV6)) {
739 int nh_len; /* IPv6 Header + Extensions */
740
741 nh_len = parse_ipv6hdr(skb, key);
742 if (unlikely(nh_len < 0)) {
743 switch (nh_len) {
744 case -EINVAL:
745 memset(&key->ip, 0, sizeof(key->ip));
746 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
747 /* fall-through */
748 case -EPROTO:
749 skb->transport_header = skb->network_header;
750 error = 0;
751 break;
752 default:
753 error = nh_len;
754 }
755 return error;
756 }
757
758 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
759 return 0;
760 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
761 key->ip.frag = OVS_FRAG_TYPE_FIRST;
762
763 /* Transport layer. */
764 if (key->ip.proto == NEXTHDR_TCP) {
765 if (tcphdr_ok(skb)) {
766 struct tcphdr *tcp = tcp_hdr(skb);
767 key->tp.src = tcp->source;
768 key->tp.dst = tcp->dest;
769 key->tp.flags = TCP_FLAGS_BE16(tcp);
770 } else {
771 memset(&key->tp, 0, sizeof(key->tp));
772 }
773 } else if (key->ip.proto == NEXTHDR_UDP) {
774 if (udphdr_ok(skb)) {
775 struct udphdr *udp = udp_hdr(skb);
776 key->tp.src = udp->source;
777 key->tp.dst = udp->dest;
778 } else {
779 memset(&key->tp, 0, sizeof(key->tp));
780 }
781 } else if (key->ip.proto == NEXTHDR_SCTP) {
782 if (sctphdr_ok(skb)) {
783 struct sctphdr *sctp = sctp_hdr(skb);
784 key->tp.src = sctp->source;
785 key->tp.dst = sctp->dest;
786 } else {
787 memset(&key->tp, 0, sizeof(key->tp));
788 }
789 } else if (key->ip.proto == NEXTHDR_ICMP) {
790 if (icmp6hdr_ok(skb)) {
791 error = parse_icmpv6(skb, key, nh_len);
792 if (error)
793 return error;
794 } else {
795 memset(&key->tp, 0, sizeof(key->tp));
796 }
797 }
798 } else if (key->eth.type == htons(ETH_P_NSH)) {
799 error = parse_nsh(skb, key);
800 if (error)
801 return error;
802 }
803 return 0;
804}
805
806int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
807{
808 int res;
809
810 res = key_extract(skb, key);
811 if (!res)
812 key->mac_proto &= ~SW_FLOW_KEY_INVALID;
813
814 return res;
815}
816
817static int key_extract_mac_proto(struct sk_buff *skb)
818{
819 switch (skb->dev->type) {
820 case ARPHRD_ETHER:
821 return MAC_PROTO_ETHERNET;
822 case ARPHRD_NONE:
823 if (skb->protocol == htons(ETH_P_TEB))
824 return MAC_PROTO_ETHERNET;
825 return MAC_PROTO_NONE;
826 }
827 WARN_ON_ONCE(1);
828 return -EINVAL;
829}
830
831int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
832 struct sk_buff *skb, struct sw_flow_key *key)
833{
834 int res, err;
835
836 /* Extract metadata from packet. */
837 if (tun_info) {
838 key->tun_proto = ip_tunnel_info_af(tun_info);
839 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
840
841 if (tun_info->options_len) {
842 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
843 8)) - 1
844 > sizeof(key->tun_opts));
845
846 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
847 tun_info);
848 key->tun_opts_len = tun_info->options_len;
849 } else {
850 key->tun_opts_len = 0;
851 }
852 } else {
853 key->tun_proto = 0;
854 key->tun_opts_len = 0;
855 memset(&key->tun_key, 0, sizeof(key->tun_key));
856 }
857
858 key->phy.priority = skb->priority;
859 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
860 key->phy.skb_mark = skb->mark;
861 key->ovs_flow_hash = 0;
862 res = key_extract_mac_proto(skb);
863 if (res < 0)
864 return res;
865 key->mac_proto = res;
866 key->recirc_id = 0;
867
868 err = key_extract(skb, key);
869 if (!err)
870 ovs_ct_fill_key(skb, key); /* Must be after key_extract(). */
871 return err;
872}
873
874int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
875 struct sk_buff *skb,
876 struct sw_flow_key *key, bool log)
877{
878 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
879 u64 attrs = 0;
880 int err;
881
882 err = parse_flow_nlattrs(attr, a, &attrs, log);
883 if (err)
884 return -EINVAL;
885
886 /* Extract metadata from netlink attributes. */
887 err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
888 if (err)
889 return err;
890
891 /* key_extract assumes that skb->protocol is set-up for
892 * layer 3 packets which is the case for other callers,
893 * in particular packets received from the network stack.
894 * Here the correct value can be set from the metadata
895 * extracted above.
896 * For L2 packet key eth type would be zero. skb protocol
897 * would be set to correct value later during key-extact.
898 */
899
900 skb->protocol = key->eth.type;
901 err = key_extract(skb, key);
902 if (err)
903 return err;
904
905 /* Check that we have conntrack original direction tuple metadata only
906 * for packets for which it makes sense. Otherwise the key may be
907 * corrupted due to overlapping key fields.
908 */
909 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
910 key->eth.type != htons(ETH_P_IP))
911 return -EINVAL;
912 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
913 (key->eth.type != htons(ETH_P_IPV6) ||
914 sw_flow_key_is_nd(key)))
915 return -EINVAL;
916
917 return 0;
918}
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (c) 2007-2014 Nicira, Inc.
4 */
5
6#include <linux/uaccess.h>
7#include <linux/netdevice.h>
8#include <linux/etherdevice.h>
9#include <linux/if_ether.h>
10#include <linux/if_vlan.h>
11#include <net/llc_pdu.h>
12#include <linux/kernel.h>
13#include <linux/jhash.h>
14#include <linux/jiffies.h>
15#include <linux/llc.h>
16#include <linux/module.h>
17#include <linux/in.h>
18#include <linux/rcupdate.h>
19#include <linux/cpumask.h>
20#include <linux/if_arp.h>
21#include <linux/ip.h>
22#include <linux/ipv6.h>
23#include <linux/mpls.h>
24#include <linux/sctp.h>
25#include <linux/smp.h>
26#include <linux/tcp.h>
27#include <linux/udp.h>
28#include <linux/icmp.h>
29#include <linux/icmpv6.h>
30#include <linux/rculist.h>
31#include <net/ip.h>
32#include <net/ip_tunnels.h>
33#include <net/ipv6.h>
34#include <net/mpls.h>
35#include <net/ndisc.h>
36#include <net/nsh.h>
37#include <net/pkt_cls.h>
38#include <net/netfilter/nf_conntrack_zones.h>
39
40#include "conntrack.h"
41#include "datapath.h"
42#include "flow.h"
43#include "flow_netlink.h"
44#include "vport.h"
45
46u64 ovs_flow_used_time(unsigned long flow_jiffies)
47{
48 struct timespec64 cur_ts;
49 u64 cur_ms, idle_ms;
50
51 ktime_get_ts64(&cur_ts);
52 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
53 cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
54 cur_ts.tv_nsec / NSEC_PER_MSEC;
55
56 return cur_ms - idle_ms;
57}
58
59#define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
60
61void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
62 const struct sk_buff *skb)
63{
64 struct sw_flow_stats *stats;
65 unsigned int cpu = smp_processor_id();
66 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
67
68 stats = rcu_dereference(flow->stats[cpu]);
69
70 /* Check if already have CPU-specific stats. */
71 if (likely(stats)) {
72 spin_lock(&stats->lock);
73 /* Mark if we write on the pre-allocated stats. */
74 if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
75 flow->stats_last_writer = cpu;
76 } else {
77 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
78 spin_lock(&stats->lock);
79
80 /* If the current CPU is the only writer on the
81 * pre-allocated stats keep using them.
82 */
83 if (unlikely(flow->stats_last_writer != cpu)) {
84 /* A previous locker may have already allocated the
85 * stats, so we need to check again. If CPU-specific
86 * stats were already allocated, we update the pre-
87 * allocated stats as we have already locked them.
88 */
89 if (likely(flow->stats_last_writer != -1) &&
90 likely(!rcu_access_pointer(flow->stats[cpu]))) {
91 /* Try to allocate CPU-specific stats. */
92 struct sw_flow_stats *new_stats;
93
94 new_stats =
95 kmem_cache_alloc_node(flow_stats_cache,
96 GFP_NOWAIT |
97 __GFP_THISNODE |
98 __GFP_NOWARN |
99 __GFP_NOMEMALLOC,
100 numa_node_id());
101 if (likely(new_stats)) {
102 new_stats->used = jiffies;
103 new_stats->packet_count = 1;
104 new_stats->byte_count = len;
105 new_stats->tcp_flags = tcp_flags;
106 spin_lock_init(&new_stats->lock);
107
108 rcu_assign_pointer(flow->stats[cpu],
109 new_stats);
110 cpumask_set_cpu(cpu,
111 flow->cpu_used_mask);
112 goto unlock;
113 }
114 }
115 flow->stats_last_writer = cpu;
116 }
117 }
118
119 stats->used = jiffies;
120 stats->packet_count++;
121 stats->byte_count += len;
122 stats->tcp_flags |= tcp_flags;
123unlock:
124 spin_unlock(&stats->lock);
125}
126
127/* Must be called with rcu_read_lock or ovs_mutex. */
128void ovs_flow_stats_get(const struct sw_flow *flow,
129 struct ovs_flow_stats *ovs_stats,
130 unsigned long *used, __be16 *tcp_flags)
131{
132 int cpu;
133
134 *used = 0;
135 *tcp_flags = 0;
136 memset(ovs_stats, 0, sizeof(*ovs_stats));
137
138 /* We open code this to make sure cpu 0 is always considered */
139 for (cpu = 0; cpu < nr_cpu_ids;
140 cpu = cpumask_next(cpu, flow->cpu_used_mask)) {
141 struct sw_flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
142
143 if (stats) {
144 /* Local CPU may write on non-local stats, so we must
145 * block bottom-halves here.
146 */
147 spin_lock_bh(&stats->lock);
148 if (!*used || time_after(stats->used, *used))
149 *used = stats->used;
150 *tcp_flags |= stats->tcp_flags;
151 ovs_stats->n_packets += stats->packet_count;
152 ovs_stats->n_bytes += stats->byte_count;
153 spin_unlock_bh(&stats->lock);
154 }
155 }
156}
157
158/* Called with ovs_mutex. */
159void ovs_flow_stats_clear(struct sw_flow *flow)
160{
161 int cpu;
162
163 /* We open code this to make sure cpu 0 is always considered */
164 for (cpu = 0; cpu < nr_cpu_ids;
165 cpu = cpumask_next(cpu, flow->cpu_used_mask)) {
166 struct sw_flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
167
168 if (stats) {
169 spin_lock_bh(&stats->lock);
170 stats->used = 0;
171 stats->packet_count = 0;
172 stats->byte_count = 0;
173 stats->tcp_flags = 0;
174 spin_unlock_bh(&stats->lock);
175 }
176 }
177}
178
179static int check_header(struct sk_buff *skb, int len)
180{
181 if (unlikely(skb->len < len))
182 return -EINVAL;
183 if (unlikely(!pskb_may_pull(skb, len)))
184 return -ENOMEM;
185 return 0;
186}
187
188static bool arphdr_ok(struct sk_buff *skb)
189{
190 return pskb_may_pull(skb, skb_network_offset(skb) +
191 sizeof(struct arp_eth_header));
192}
193
194static int check_iphdr(struct sk_buff *skb)
195{
196 unsigned int nh_ofs = skb_network_offset(skb);
197 unsigned int ip_len;
198 int err;
199
200 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
201 if (unlikely(err))
202 return err;
203
204 ip_len = ip_hdrlen(skb);
205 if (unlikely(ip_len < sizeof(struct iphdr) ||
206 skb->len < nh_ofs + ip_len))
207 return -EINVAL;
208
209 skb_set_transport_header(skb, nh_ofs + ip_len);
210 return 0;
211}
212
213static bool tcphdr_ok(struct sk_buff *skb)
214{
215 int th_ofs = skb_transport_offset(skb);
216 int tcp_len;
217
218 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
219 return false;
220
221 tcp_len = tcp_hdrlen(skb);
222 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
223 skb->len < th_ofs + tcp_len))
224 return false;
225
226 return true;
227}
228
229static bool udphdr_ok(struct sk_buff *skb)
230{
231 return pskb_may_pull(skb, skb_transport_offset(skb) +
232 sizeof(struct udphdr));
233}
234
235static bool sctphdr_ok(struct sk_buff *skb)
236{
237 return pskb_may_pull(skb, skb_transport_offset(skb) +
238 sizeof(struct sctphdr));
239}
240
241static bool icmphdr_ok(struct sk_buff *skb)
242{
243 return pskb_may_pull(skb, skb_transport_offset(skb) +
244 sizeof(struct icmphdr));
245}
246
247/**
248 * get_ipv6_ext_hdrs() - Parses packet and sets IPv6 extension header flags.
249 *
250 * @skb: buffer where extension header data starts in packet
251 * @nh: ipv6 header
252 * @ext_hdrs: flags are stored here
253 *
254 * OFPIEH12_UNREP is set if more than one of a given IPv6 extension header
255 * is unexpectedly encountered. (Two destination options headers may be
256 * expected and would not cause this bit to be set.)
257 *
258 * OFPIEH12_UNSEQ is set if IPv6 extension headers were not in the order
259 * preferred (but not required) by RFC 2460:
260 *
261 * When more than one extension header is used in the same packet, it is
262 * recommended that those headers appear in the following order:
263 * IPv6 header
264 * Hop-by-Hop Options header
265 * Destination Options header
266 * Routing header
267 * Fragment header
268 * Authentication header
269 * Encapsulating Security Payload header
270 * Destination Options header
271 * upper-layer header
272 */
273static void get_ipv6_ext_hdrs(struct sk_buff *skb, struct ipv6hdr *nh,
274 u16 *ext_hdrs)
275{
276 u8 next_type = nh->nexthdr;
277 unsigned int start = skb_network_offset(skb) + sizeof(struct ipv6hdr);
278 int dest_options_header_count = 0;
279
280 *ext_hdrs = 0;
281
282 while (ipv6_ext_hdr(next_type)) {
283 struct ipv6_opt_hdr _hdr, *hp;
284
285 switch (next_type) {
286 case IPPROTO_NONE:
287 *ext_hdrs |= OFPIEH12_NONEXT;
288 /* stop parsing */
289 return;
290
291 case IPPROTO_ESP:
292 if (*ext_hdrs & OFPIEH12_ESP)
293 *ext_hdrs |= OFPIEH12_UNREP;
294 if ((*ext_hdrs & ~(OFPIEH12_HOP | OFPIEH12_DEST |
295 OFPIEH12_ROUTER | IPPROTO_FRAGMENT |
296 OFPIEH12_AUTH | OFPIEH12_UNREP)) ||
297 dest_options_header_count >= 2) {
298 *ext_hdrs |= OFPIEH12_UNSEQ;
299 }
300 *ext_hdrs |= OFPIEH12_ESP;
301 break;
302
303 case IPPROTO_AH:
304 if (*ext_hdrs & OFPIEH12_AUTH)
305 *ext_hdrs |= OFPIEH12_UNREP;
306 if ((*ext_hdrs &
307 ~(OFPIEH12_HOP | OFPIEH12_DEST | OFPIEH12_ROUTER |
308 IPPROTO_FRAGMENT | OFPIEH12_UNREP)) ||
309 dest_options_header_count >= 2) {
310 *ext_hdrs |= OFPIEH12_UNSEQ;
311 }
312 *ext_hdrs |= OFPIEH12_AUTH;
313 break;
314
315 case IPPROTO_DSTOPTS:
316 if (dest_options_header_count == 0) {
317 if (*ext_hdrs &
318 ~(OFPIEH12_HOP | OFPIEH12_UNREP))
319 *ext_hdrs |= OFPIEH12_UNSEQ;
320 *ext_hdrs |= OFPIEH12_DEST;
321 } else if (dest_options_header_count == 1) {
322 if (*ext_hdrs &
323 ~(OFPIEH12_HOP | OFPIEH12_DEST |
324 OFPIEH12_ROUTER | OFPIEH12_FRAG |
325 OFPIEH12_AUTH | OFPIEH12_ESP |
326 OFPIEH12_UNREP)) {
327 *ext_hdrs |= OFPIEH12_UNSEQ;
328 }
329 } else {
330 *ext_hdrs |= OFPIEH12_UNREP;
331 }
332 dest_options_header_count++;
333 break;
334
335 case IPPROTO_FRAGMENT:
336 if (*ext_hdrs & OFPIEH12_FRAG)
337 *ext_hdrs |= OFPIEH12_UNREP;
338 if ((*ext_hdrs & ~(OFPIEH12_HOP |
339 OFPIEH12_DEST |
340 OFPIEH12_ROUTER |
341 OFPIEH12_UNREP)) ||
342 dest_options_header_count >= 2) {
343 *ext_hdrs |= OFPIEH12_UNSEQ;
344 }
345 *ext_hdrs |= OFPIEH12_FRAG;
346 break;
347
348 case IPPROTO_ROUTING:
349 if (*ext_hdrs & OFPIEH12_ROUTER)
350 *ext_hdrs |= OFPIEH12_UNREP;
351 if ((*ext_hdrs & ~(OFPIEH12_HOP |
352 OFPIEH12_DEST |
353 OFPIEH12_UNREP)) ||
354 dest_options_header_count >= 2) {
355 *ext_hdrs |= OFPIEH12_UNSEQ;
356 }
357 *ext_hdrs |= OFPIEH12_ROUTER;
358 break;
359
360 case IPPROTO_HOPOPTS:
361 if (*ext_hdrs & OFPIEH12_HOP)
362 *ext_hdrs |= OFPIEH12_UNREP;
363 /* OFPIEH12_HOP is set to 1 if a hop-by-hop IPv6
364 * extension header is present as the first
365 * extension header in the packet.
366 */
367 if (*ext_hdrs == 0)
368 *ext_hdrs |= OFPIEH12_HOP;
369 else
370 *ext_hdrs |= OFPIEH12_UNSEQ;
371 break;
372
373 default:
374 return;
375 }
376
377 hp = skb_header_pointer(skb, start, sizeof(_hdr), &_hdr);
378 if (!hp)
379 break;
380 next_type = hp->nexthdr;
381 start += ipv6_optlen(hp);
382 }
383}
384
385static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
386{
387 unsigned short frag_off;
388 unsigned int payload_ofs = 0;
389 unsigned int nh_ofs = skb_network_offset(skb);
390 unsigned int nh_len;
391 struct ipv6hdr *nh;
392 int err, nexthdr, flags = 0;
393
394 err = check_header(skb, nh_ofs + sizeof(*nh));
395 if (unlikely(err))
396 return err;
397
398 nh = ipv6_hdr(skb);
399
400 get_ipv6_ext_hdrs(skb, nh, &key->ipv6.exthdrs);
401
402 key->ip.proto = NEXTHDR_NONE;
403 key->ip.tos = ipv6_get_dsfield(nh);
404 key->ip.ttl = nh->hop_limit;
405 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
406 key->ipv6.addr.src = nh->saddr;
407 key->ipv6.addr.dst = nh->daddr;
408
409 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
410 if (flags & IP6_FH_F_FRAG) {
411 if (frag_off) {
412 key->ip.frag = OVS_FRAG_TYPE_LATER;
413 key->ip.proto = NEXTHDR_FRAGMENT;
414 return 0;
415 }
416 key->ip.frag = OVS_FRAG_TYPE_FIRST;
417 } else {
418 key->ip.frag = OVS_FRAG_TYPE_NONE;
419 }
420
421 /* Delayed handling of error in ipv6_find_hdr() as it
422 * always sets flags and frag_off to a valid value which may be
423 * used to set key->ip.frag above.
424 */
425 if (unlikely(nexthdr < 0))
426 return -EPROTO;
427
428 nh_len = payload_ofs - nh_ofs;
429 skb_set_transport_header(skb, nh_ofs + nh_len);
430 key->ip.proto = nexthdr;
431 return nh_len;
432}
433
434static bool icmp6hdr_ok(struct sk_buff *skb)
435{
436 return pskb_may_pull(skb, skb_transport_offset(skb) +
437 sizeof(struct icmp6hdr));
438}
439
440/**
441 * parse_vlan_tag - Parse vlan tag from vlan header.
442 * @skb: skb containing frame to parse
443 * @key_vh: pointer to parsed vlan tag
444 * @untag_vlan: should the vlan header be removed from the frame
445 *
446 * Return: ERROR on memory error.
447 * %0 if it encounters a non-vlan or incomplete packet.
448 * %1 after successfully parsing vlan tag.
449 */
450static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
451 bool untag_vlan)
452{
453 struct vlan_head *vh = (struct vlan_head *)skb->data;
454
455 if (likely(!eth_type_vlan(vh->tpid)))
456 return 0;
457
458 if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
459 return 0;
460
461 if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
462 sizeof(__be16))))
463 return -ENOMEM;
464
465 vh = (struct vlan_head *)skb->data;
466 key_vh->tci = vh->tci | htons(VLAN_CFI_MASK);
467 key_vh->tpid = vh->tpid;
468
469 if (unlikely(untag_vlan)) {
470 int offset = skb->data - skb_mac_header(skb);
471 u16 tci;
472 int err;
473
474 __skb_push(skb, offset);
475 err = __skb_vlan_pop(skb, &tci);
476 __skb_pull(skb, offset);
477 if (err)
478 return err;
479 __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
480 } else {
481 __skb_pull(skb, sizeof(struct vlan_head));
482 }
483 return 1;
484}
485
486static void clear_vlan(struct sw_flow_key *key)
487{
488 key->eth.vlan.tci = 0;
489 key->eth.vlan.tpid = 0;
490 key->eth.cvlan.tci = 0;
491 key->eth.cvlan.tpid = 0;
492}
493
494static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
495{
496 int res;
497
498 if (skb_vlan_tag_present(skb)) {
499 key->eth.vlan.tci = htons(skb->vlan_tci) | htons(VLAN_CFI_MASK);
500 key->eth.vlan.tpid = skb->vlan_proto;
501 } else {
502 /* Parse outer vlan tag in the non-accelerated case. */
503 res = parse_vlan_tag(skb, &key->eth.vlan, true);
504 if (res <= 0)
505 return res;
506 }
507
508 /* Parse inner vlan tag. */
509 res = parse_vlan_tag(skb, &key->eth.cvlan, false);
510 if (res <= 0)
511 return res;
512
513 return 0;
514}
515
516static __be16 parse_ethertype(struct sk_buff *skb)
517{
518 struct llc_snap_hdr {
519 u8 dsap; /* Always 0xAA */
520 u8 ssap; /* Always 0xAA */
521 u8 ctrl;
522 u8 oui[3];
523 __be16 ethertype;
524 };
525 struct llc_snap_hdr *llc;
526 __be16 proto;
527
528 proto = *(__be16 *) skb->data;
529 __skb_pull(skb, sizeof(__be16));
530
531 if (eth_proto_is_802_3(proto))
532 return proto;
533
534 if (skb->len < sizeof(struct llc_snap_hdr))
535 return htons(ETH_P_802_2);
536
537 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
538 return htons(0);
539
540 llc = (struct llc_snap_hdr *) skb->data;
541 if (llc->dsap != LLC_SAP_SNAP ||
542 llc->ssap != LLC_SAP_SNAP ||
543 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
544 return htons(ETH_P_802_2);
545
546 __skb_pull(skb, sizeof(struct llc_snap_hdr));
547
548 if (eth_proto_is_802_3(llc->ethertype))
549 return llc->ethertype;
550
551 return htons(ETH_P_802_2);
552}
553
554static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
555 int nh_len)
556{
557 struct icmp6hdr *icmp = icmp6_hdr(skb);
558
559 /* The ICMPv6 type and code fields use the 16-bit transport port
560 * fields, so we need to store them in 16-bit network byte order.
561 */
562 key->tp.src = htons(icmp->icmp6_type);
563 key->tp.dst = htons(icmp->icmp6_code);
564 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
565
566 if (icmp->icmp6_code == 0 &&
567 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
568 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
569 int icmp_len = skb->len - skb_transport_offset(skb);
570 struct nd_msg *nd;
571 int offset;
572
573 /* In order to process neighbor discovery options, we need the
574 * entire packet.
575 */
576 if (unlikely(icmp_len < sizeof(*nd)))
577 return 0;
578
579 if (unlikely(skb_linearize(skb)))
580 return -ENOMEM;
581
582 nd = (struct nd_msg *)skb_transport_header(skb);
583 key->ipv6.nd.target = nd->target;
584
585 icmp_len -= sizeof(*nd);
586 offset = 0;
587 while (icmp_len >= 8) {
588 struct nd_opt_hdr *nd_opt =
589 (struct nd_opt_hdr *)(nd->opt + offset);
590 int opt_len = nd_opt->nd_opt_len * 8;
591
592 if (unlikely(!opt_len || opt_len > icmp_len))
593 return 0;
594
595 /* Store the link layer address if the appropriate
596 * option is provided. It is considered an error if
597 * the same link layer option is specified twice.
598 */
599 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
600 && opt_len == 8) {
601 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
602 goto invalid;
603 ether_addr_copy(key->ipv6.nd.sll,
604 &nd->opt[offset+sizeof(*nd_opt)]);
605 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
606 && opt_len == 8) {
607 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
608 goto invalid;
609 ether_addr_copy(key->ipv6.nd.tll,
610 &nd->opt[offset+sizeof(*nd_opt)]);
611 }
612
613 icmp_len -= opt_len;
614 offset += opt_len;
615 }
616 }
617
618 return 0;
619
620invalid:
621 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
622 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
623 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
624
625 return 0;
626}
627
628static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
629{
630 struct nshhdr *nh;
631 unsigned int nh_ofs = skb_network_offset(skb);
632 u8 version, length;
633 int err;
634
635 err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
636 if (unlikely(err))
637 return err;
638
639 nh = nsh_hdr(skb);
640 version = nsh_get_ver(nh);
641 length = nsh_hdr_len(nh);
642
643 if (version != 0)
644 return -EINVAL;
645
646 err = check_header(skb, nh_ofs + length);
647 if (unlikely(err))
648 return err;
649
650 nh = nsh_hdr(skb);
651 key->nsh.base.flags = nsh_get_flags(nh);
652 key->nsh.base.ttl = nsh_get_ttl(nh);
653 key->nsh.base.mdtype = nh->mdtype;
654 key->nsh.base.np = nh->np;
655 key->nsh.base.path_hdr = nh->path_hdr;
656 switch (key->nsh.base.mdtype) {
657 case NSH_M_TYPE1:
658 if (length != NSH_M_TYPE1_LEN)
659 return -EINVAL;
660 memcpy(key->nsh.context, nh->md1.context,
661 sizeof(nh->md1));
662 break;
663 case NSH_M_TYPE2:
664 memset(key->nsh.context, 0,
665 sizeof(nh->md1));
666 break;
667 default:
668 return -EINVAL;
669 }
670
671 return 0;
672}
673
674/**
675 * key_extract_l3l4 - extracts L3/L4 header information.
676 * @skb: sk_buff that contains the frame, with skb->data pointing to the
677 * L3 header
678 * @key: output flow key
679 *
680 * Return: %0 if successful, otherwise a negative errno value.
681 */
682static int key_extract_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
683{
684 int error;
685
686 /* Network layer. */
687 if (key->eth.type == htons(ETH_P_IP)) {
688 struct iphdr *nh;
689 __be16 offset;
690
691 error = check_iphdr(skb);
692 if (unlikely(error)) {
693 memset(&key->ip, 0, sizeof(key->ip));
694 memset(&key->ipv4, 0, sizeof(key->ipv4));
695 if (error == -EINVAL) {
696 skb->transport_header = skb->network_header;
697 error = 0;
698 }
699 return error;
700 }
701
702 nh = ip_hdr(skb);
703 key->ipv4.addr.src = nh->saddr;
704 key->ipv4.addr.dst = nh->daddr;
705
706 key->ip.proto = nh->protocol;
707 key->ip.tos = nh->tos;
708 key->ip.ttl = nh->ttl;
709
710 offset = nh->frag_off & htons(IP_OFFSET);
711 if (offset) {
712 key->ip.frag = OVS_FRAG_TYPE_LATER;
713 memset(&key->tp, 0, sizeof(key->tp));
714 return 0;
715 }
716 if (nh->frag_off & htons(IP_MF) ||
717 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
718 key->ip.frag = OVS_FRAG_TYPE_FIRST;
719 else
720 key->ip.frag = OVS_FRAG_TYPE_NONE;
721
722 /* Transport layer. */
723 if (key->ip.proto == IPPROTO_TCP) {
724 if (tcphdr_ok(skb)) {
725 struct tcphdr *tcp = tcp_hdr(skb);
726 key->tp.src = tcp->source;
727 key->tp.dst = tcp->dest;
728 key->tp.flags = TCP_FLAGS_BE16(tcp);
729 } else {
730 memset(&key->tp, 0, sizeof(key->tp));
731 }
732
733 } else if (key->ip.proto == IPPROTO_UDP) {
734 if (udphdr_ok(skb)) {
735 struct udphdr *udp = udp_hdr(skb);
736 key->tp.src = udp->source;
737 key->tp.dst = udp->dest;
738 } else {
739 memset(&key->tp, 0, sizeof(key->tp));
740 }
741 } else if (key->ip.proto == IPPROTO_SCTP) {
742 if (sctphdr_ok(skb)) {
743 struct sctphdr *sctp = sctp_hdr(skb);
744 key->tp.src = sctp->source;
745 key->tp.dst = sctp->dest;
746 } else {
747 memset(&key->tp, 0, sizeof(key->tp));
748 }
749 } else if (key->ip.proto == IPPROTO_ICMP) {
750 if (icmphdr_ok(skb)) {
751 struct icmphdr *icmp = icmp_hdr(skb);
752 /* The ICMP type and code fields use the 16-bit
753 * transport port fields, so we need to store
754 * them in 16-bit network byte order. */
755 key->tp.src = htons(icmp->type);
756 key->tp.dst = htons(icmp->code);
757 } else {
758 memset(&key->tp, 0, sizeof(key->tp));
759 }
760 }
761
762 } else if (key->eth.type == htons(ETH_P_ARP) ||
763 key->eth.type == htons(ETH_P_RARP)) {
764 struct arp_eth_header *arp;
765 bool arp_available = arphdr_ok(skb);
766
767 arp = (struct arp_eth_header *)skb_network_header(skb);
768
769 if (arp_available &&
770 arp->ar_hrd == htons(ARPHRD_ETHER) &&
771 arp->ar_pro == htons(ETH_P_IP) &&
772 arp->ar_hln == ETH_ALEN &&
773 arp->ar_pln == 4) {
774
775 /* We only match on the lower 8 bits of the opcode. */
776 if (ntohs(arp->ar_op) <= 0xff)
777 key->ip.proto = ntohs(arp->ar_op);
778 else
779 key->ip.proto = 0;
780
781 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
782 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
783 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
784 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
785 } else {
786 memset(&key->ip, 0, sizeof(key->ip));
787 memset(&key->ipv4, 0, sizeof(key->ipv4));
788 }
789 } else if (eth_p_mpls(key->eth.type)) {
790 u8 label_count = 1;
791
792 memset(&key->mpls, 0, sizeof(key->mpls));
793 skb_set_inner_network_header(skb, skb->mac_len);
794 while (1) {
795 __be32 lse;
796
797 error = check_header(skb, skb->mac_len +
798 label_count * MPLS_HLEN);
799 if (unlikely(error))
800 return 0;
801
802 memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
803
804 if (label_count <= MPLS_LABEL_DEPTH)
805 memcpy(&key->mpls.lse[label_count - 1], &lse,
806 MPLS_HLEN);
807
808 skb_set_inner_network_header(skb, skb->mac_len +
809 label_count * MPLS_HLEN);
810 if (lse & htonl(MPLS_LS_S_MASK))
811 break;
812
813 label_count++;
814 }
815 if (label_count > MPLS_LABEL_DEPTH)
816 label_count = MPLS_LABEL_DEPTH;
817
818 key->mpls.num_labels_mask = GENMASK(label_count - 1, 0);
819 } else if (key->eth.type == htons(ETH_P_IPV6)) {
820 int nh_len; /* IPv6 Header + Extensions */
821
822 nh_len = parse_ipv6hdr(skb, key);
823 if (unlikely(nh_len < 0)) {
824 switch (nh_len) {
825 case -EINVAL:
826 memset(&key->ip, 0, sizeof(key->ip));
827 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
828 fallthrough;
829 case -EPROTO:
830 skb->transport_header = skb->network_header;
831 error = 0;
832 break;
833 default:
834 error = nh_len;
835 }
836 return error;
837 }
838
839 if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
840 memset(&key->tp, 0, sizeof(key->tp));
841 return 0;
842 }
843 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
844 key->ip.frag = OVS_FRAG_TYPE_FIRST;
845
846 /* Transport layer. */
847 if (key->ip.proto == NEXTHDR_TCP) {
848 if (tcphdr_ok(skb)) {
849 struct tcphdr *tcp = tcp_hdr(skb);
850 key->tp.src = tcp->source;
851 key->tp.dst = tcp->dest;
852 key->tp.flags = TCP_FLAGS_BE16(tcp);
853 } else {
854 memset(&key->tp, 0, sizeof(key->tp));
855 }
856 } else if (key->ip.proto == NEXTHDR_UDP) {
857 if (udphdr_ok(skb)) {
858 struct udphdr *udp = udp_hdr(skb);
859 key->tp.src = udp->source;
860 key->tp.dst = udp->dest;
861 } else {
862 memset(&key->tp, 0, sizeof(key->tp));
863 }
864 } else if (key->ip.proto == NEXTHDR_SCTP) {
865 if (sctphdr_ok(skb)) {
866 struct sctphdr *sctp = sctp_hdr(skb);
867 key->tp.src = sctp->source;
868 key->tp.dst = sctp->dest;
869 } else {
870 memset(&key->tp, 0, sizeof(key->tp));
871 }
872 } else if (key->ip.proto == NEXTHDR_ICMP) {
873 if (icmp6hdr_ok(skb)) {
874 error = parse_icmpv6(skb, key, nh_len);
875 if (error)
876 return error;
877 } else {
878 memset(&key->tp, 0, sizeof(key->tp));
879 }
880 }
881 } else if (key->eth.type == htons(ETH_P_NSH)) {
882 error = parse_nsh(skb, key);
883 if (error)
884 return error;
885 }
886 return 0;
887}
888
889/**
890 * key_extract - extracts a flow key from an Ethernet frame.
891 * @skb: sk_buff that contains the frame, with skb->data pointing to the
892 * Ethernet header
893 * @key: output flow key
894 *
895 * The caller must ensure that skb->len >= ETH_HLEN.
896 *
897 * Initializes @skb header fields as follows:
898 *
899 * - skb->mac_header: the L2 header.
900 *
901 * - skb->network_header: just past the L2 header, or just past the
902 * VLAN header, to the first byte of the L2 payload.
903 *
904 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
905 * on output, then just past the IP header, if one is present and
906 * of a correct length, otherwise the same as skb->network_header.
907 * For other key->eth.type values it is left untouched.
908 *
909 * - skb->protocol: the type of the data starting at skb->network_header.
910 * Equals to key->eth.type.
911 *
912 * Return: %0 if successful, otherwise a negative errno value.
913 */
914static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
915{
916 struct ethhdr *eth;
917
918 /* Flags are always used as part of stats */
919 key->tp.flags = 0;
920
921 skb_reset_mac_header(skb);
922
923 /* Link layer. */
924 clear_vlan(key);
925 if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
926 if (unlikely(eth_type_vlan(skb->protocol)))
927 return -EINVAL;
928
929 skb_reset_network_header(skb);
930 key->eth.type = skb->protocol;
931 } else {
932 eth = eth_hdr(skb);
933 ether_addr_copy(key->eth.src, eth->h_source);
934 ether_addr_copy(key->eth.dst, eth->h_dest);
935
936 __skb_pull(skb, 2 * ETH_ALEN);
937 /* We are going to push all headers that we pull, so no need to
938 * update skb->csum here.
939 */
940
941 if (unlikely(parse_vlan(skb, key)))
942 return -ENOMEM;
943
944 key->eth.type = parse_ethertype(skb);
945 if (unlikely(key->eth.type == htons(0)))
946 return -ENOMEM;
947
948 /* Multiple tagged packets need to retain TPID to satisfy
949 * skb_vlan_pop(), which will later shift the ethertype into
950 * skb->protocol.
951 */
952 if (key->eth.cvlan.tci & htons(VLAN_CFI_MASK))
953 skb->protocol = key->eth.cvlan.tpid;
954 else
955 skb->protocol = key->eth.type;
956
957 skb_reset_network_header(skb);
958 __skb_push(skb, skb->data - skb_mac_header(skb));
959 }
960
961 skb_reset_mac_len(skb);
962
963 /* Fill out L3/L4 key info, if any */
964 return key_extract_l3l4(skb, key);
965}
966
967/* In the case of conntrack fragment handling it expects L3 headers,
968 * add a helper.
969 */
970int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
971{
972 return key_extract_l3l4(skb, key);
973}
974
975int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
976{
977 int res;
978
979 res = key_extract(skb, key);
980 if (!res)
981 key->mac_proto &= ~SW_FLOW_KEY_INVALID;
982
983 return res;
984}
985
986static int key_extract_mac_proto(struct sk_buff *skb)
987{
988 switch (skb->dev->type) {
989 case ARPHRD_ETHER:
990 return MAC_PROTO_ETHERNET;
991 case ARPHRD_NONE:
992 if (skb->protocol == htons(ETH_P_TEB))
993 return MAC_PROTO_ETHERNET;
994 return MAC_PROTO_NONE;
995 }
996 WARN_ON_ONCE(1);
997 return -EINVAL;
998}
999
1000int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
1001 struct sk_buff *skb, struct sw_flow_key *key)
1002{
1003#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1004 struct tc_skb_ext *tc_ext;
1005#endif
1006 bool post_ct = false, post_ct_snat = false, post_ct_dnat = false;
1007 int res, err;
1008 u16 zone = 0;
1009
1010 /* Extract metadata from packet. */
1011 if (tun_info) {
1012 key->tun_proto = ip_tunnel_info_af(tun_info);
1013 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
1014
1015 if (tun_info->options_len) {
1016 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
1017 8)) - 1
1018 > sizeof(key->tun_opts));
1019
1020 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
1021 tun_info);
1022 key->tun_opts_len = tun_info->options_len;
1023 } else {
1024 key->tun_opts_len = 0;
1025 }
1026 } else {
1027 key->tun_proto = 0;
1028 key->tun_opts_len = 0;
1029 memset(&key->tun_key, 0, sizeof(key->tun_key));
1030 }
1031
1032 key->phy.priority = skb->priority;
1033 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
1034 key->phy.skb_mark = skb->mark;
1035 key->ovs_flow_hash = 0;
1036 res = key_extract_mac_proto(skb);
1037 if (res < 0)
1038 return res;
1039 key->mac_proto = res;
1040
1041#if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
1042 if (tc_skb_ext_tc_enabled()) {
1043 tc_ext = skb_ext_find(skb, TC_SKB_EXT);
1044 key->recirc_id = tc_ext && !tc_ext->act_miss ?
1045 tc_ext->chain : 0;
1046 OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
1047 post_ct = tc_ext ? tc_ext->post_ct : false;
1048 post_ct_snat = post_ct ? tc_ext->post_ct_snat : false;
1049 post_ct_dnat = post_ct ? tc_ext->post_ct_dnat : false;
1050 zone = post_ct ? tc_ext->zone : 0;
1051 } else {
1052 key->recirc_id = 0;
1053 }
1054#else
1055 key->recirc_id = 0;
1056#endif
1057
1058 err = key_extract(skb, key);
1059 if (!err) {
1060 ovs_ct_fill_key(skb, key, post_ct); /* Must be after key_extract(). */
1061 if (post_ct) {
1062 if (!skb_get_nfct(skb)) {
1063 key->ct_zone = zone;
1064 } else {
1065 if (!post_ct_dnat)
1066 key->ct_state &= ~OVS_CS_F_DST_NAT;
1067 if (!post_ct_snat)
1068 key->ct_state &= ~OVS_CS_F_SRC_NAT;
1069 }
1070 }
1071 }
1072 return err;
1073}
1074
1075int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
1076 struct sk_buff *skb,
1077 struct sw_flow_key *key, bool log)
1078{
1079 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1080 u64 attrs = 0;
1081 int err;
1082
1083 err = parse_flow_nlattrs(attr, a, &attrs, log);
1084 if (err)
1085 return -EINVAL;
1086
1087 /* Extract metadata from netlink attributes. */
1088 err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
1089 if (err)
1090 return err;
1091
1092 /* key_extract assumes that skb->protocol is set-up for
1093 * layer 3 packets which is the case for other callers,
1094 * in particular packets received from the network stack.
1095 * Here the correct value can be set from the metadata
1096 * extracted above.
1097 * For L2 packet key eth type would be zero. skb protocol
1098 * would be set to correct value later during key-extact.
1099 */
1100
1101 skb->protocol = key->eth.type;
1102 err = key_extract(skb, key);
1103 if (err)
1104 return err;
1105
1106 /* Check that we have conntrack original direction tuple metadata only
1107 * for packets for which it makes sense. Otherwise the key may be
1108 * corrupted due to overlapping key fields.
1109 */
1110 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
1111 key->eth.type != htons(ETH_P_IP))
1112 return -EINVAL;
1113 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
1114 (key->eth.type != htons(ETH_P_IPV6) ||
1115 sw_flow_key_is_nd(key)))
1116 return -EINVAL;
1117
1118 return 0;
1119}