2 * Copyright (c) 2007-2014 Nicira, Inc.
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.
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.
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
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>
31 #include <linux/rcupdate.h>
32 #include <linux/cpumask.h>
33 #include <linux/if_arp.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>
45 #include <net/ip_tunnels.h>
48 #include <net/ndisc.h>
51 #include "conntrack.h"
54 #include "flow_netlink.h"
57 u64 ovs_flow_used_time(unsigned long flow_jiffies)
59 struct timespec64 cur_ts;
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;
67 return cur_ms - idle_ms;
70 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
72 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
73 const struct sk_buff *skb)
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);
79 stats = rcu_dereference(flow->stats[cpu]);
81 /* Check if already have CPU-specific 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;
88 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
89 spin_lock(&stats->lock);
91 /* If the current CPU is the only writer on the
92 * pre-allocated stats keep using them.
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.
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;
106 kmem_cache_alloc_node(flow_stats_cache,
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);
119 rcu_assign_pointer(flow->stats[cpu],
121 cpumask_set_cpu(cpu, &flow->cpu_used_mask);
125 flow->stats_last_writer = cpu;
129 stats->used = jiffies;
130 stats->packet_count++;
131 stats->byte_count += len;
132 stats->tcp_flags |= tcp_flags;
134 spin_unlock(&stats->lock);
137 /* Must be called with rcu_read_lock or ovs_mutex. */
138 void ovs_flow_stats_get(const struct sw_flow *flow,
139 struct ovs_flow_stats *ovs_stats,
140 unsigned long *used, __be16 *tcp_flags)
146 memset(ovs_stats, 0, sizeof(*ovs_stats));
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]);
153 /* Local CPU may write on non-local stats, so we must
154 * block bottom-halves here.
156 spin_lock_bh(&stats->lock);
157 if (!*used || time_after(stats->used, *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);
167 /* Called with ovs_mutex. */
168 void ovs_flow_stats_clear(struct sw_flow *flow)
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]);
177 spin_lock_bh(&stats->lock);
179 stats->packet_count = 0;
180 stats->byte_count = 0;
181 stats->tcp_flags = 0;
182 spin_unlock_bh(&stats->lock);
187 static int check_header(struct sk_buff *skb, int len)
189 if (unlikely(skb->len < len))
191 if (unlikely(!pskb_may_pull(skb, len)))
196 static bool arphdr_ok(struct sk_buff *skb)
198 return pskb_may_pull(skb, skb_network_offset(skb) +
199 sizeof(struct arp_eth_header));
202 static int check_iphdr(struct sk_buff *skb)
204 unsigned int nh_ofs = skb_network_offset(skb);
208 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
212 ip_len = ip_hdrlen(skb);
213 if (unlikely(ip_len < sizeof(struct iphdr) ||
214 skb->len < nh_ofs + ip_len))
217 skb_set_transport_header(skb, nh_ofs + ip_len);
221 static bool tcphdr_ok(struct sk_buff *skb)
223 int th_ofs = skb_transport_offset(skb);
226 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
229 tcp_len = tcp_hdrlen(skb);
230 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
231 skb->len < th_ofs + tcp_len))
237 static bool udphdr_ok(struct sk_buff *skb)
239 return pskb_may_pull(skb, skb_transport_offset(skb) +
240 sizeof(struct udphdr));
243 static bool sctphdr_ok(struct sk_buff *skb)
245 return pskb_may_pull(skb, skb_transport_offset(skb) +
246 sizeof(struct sctphdr));
249 static bool icmphdr_ok(struct sk_buff *skb)
251 return pskb_may_pull(skb, skb_transport_offset(skb) +
252 sizeof(struct icmphdr));
255 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
257 unsigned short frag_off;
258 unsigned int payload_ofs = 0;
259 unsigned int nh_ofs = skb_network_offset(skb);
262 int err, nexthdr, flags = 0;
264 err = check_header(skb, nh_ofs + sizeof(*nh));
270 key->ip.proto = NEXTHDR_NONE;
271 key->ip.tos = ipv6_get_dsfield(nh);
272 key->ip.ttl = nh->hop_limit;
273 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
274 key->ipv6.addr.src = nh->saddr;
275 key->ipv6.addr.dst = nh->daddr;
277 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
278 if (flags & IP6_FH_F_FRAG) {
280 key->ip.frag = OVS_FRAG_TYPE_LATER;
282 key->ip.frag = OVS_FRAG_TYPE_FIRST;
284 key->ip.frag = OVS_FRAG_TYPE_NONE;
287 /* Delayed handling of error in ipv6_find_hdr() as it
288 * always sets flags and frag_off to a valid value which may be
289 * used to set key->ip.frag above.
291 if (unlikely(nexthdr < 0))
294 nh_len = payload_ofs - nh_ofs;
295 skb_set_transport_header(skb, nh_ofs + nh_len);
296 key->ip.proto = nexthdr;
300 static bool icmp6hdr_ok(struct sk_buff *skb)
302 return pskb_may_pull(skb, skb_transport_offset(skb) +
303 sizeof(struct icmp6hdr));
307 * Parse vlan tag from vlan header.
308 * Returns ERROR on memory error.
309 * Returns 0 if it encounters a non-vlan or incomplete packet.
310 * Returns 1 after successfully parsing vlan tag.
312 static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
315 struct vlan_head *vh = (struct vlan_head *)skb->data;
317 if (likely(!eth_type_vlan(vh->tpid)))
320 if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
323 if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
327 vh = (struct vlan_head *)skb->data;
328 key_vh->tci = vh->tci | htons(VLAN_TAG_PRESENT);
329 key_vh->tpid = vh->tpid;
331 if (unlikely(untag_vlan)) {
332 int offset = skb->data - skb_mac_header(skb);
336 __skb_push(skb, offset);
337 err = __skb_vlan_pop(skb, &tci);
338 __skb_pull(skb, offset);
341 __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
343 __skb_pull(skb, sizeof(struct vlan_head));
348 static void clear_vlan(struct sw_flow_key *key)
350 key->eth.vlan.tci = 0;
351 key->eth.vlan.tpid = 0;
352 key->eth.cvlan.tci = 0;
353 key->eth.cvlan.tpid = 0;
356 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
360 if (skb_vlan_tag_present(skb)) {
361 key->eth.vlan.tci = htons(skb->vlan_tci);
362 key->eth.vlan.tpid = skb->vlan_proto;
364 /* Parse outer vlan tag in the non-accelerated case. */
365 res = parse_vlan_tag(skb, &key->eth.vlan, true);
370 /* Parse inner vlan tag. */
371 res = parse_vlan_tag(skb, &key->eth.cvlan, false);
378 static __be16 parse_ethertype(struct sk_buff *skb)
380 struct llc_snap_hdr {
381 u8 dsap; /* Always 0xAA */
382 u8 ssap; /* Always 0xAA */
387 struct llc_snap_hdr *llc;
390 proto = *(__be16 *) skb->data;
391 __skb_pull(skb, sizeof(__be16));
393 if (eth_proto_is_802_3(proto))
396 if (skb->len < sizeof(struct llc_snap_hdr))
397 return htons(ETH_P_802_2);
399 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
402 llc = (struct llc_snap_hdr *) skb->data;
403 if (llc->dsap != LLC_SAP_SNAP ||
404 llc->ssap != LLC_SAP_SNAP ||
405 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
406 return htons(ETH_P_802_2);
408 __skb_pull(skb, sizeof(struct llc_snap_hdr));
410 if (eth_proto_is_802_3(llc->ethertype))
411 return llc->ethertype;
413 return htons(ETH_P_802_2);
416 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
419 struct icmp6hdr *icmp = icmp6_hdr(skb);
421 /* The ICMPv6 type and code fields use the 16-bit transport port
422 * fields, so we need to store them in 16-bit network byte order.
424 key->tp.src = htons(icmp->icmp6_type);
425 key->tp.dst = htons(icmp->icmp6_code);
426 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
428 if (icmp->icmp6_code == 0 &&
429 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
430 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
431 int icmp_len = skb->len - skb_transport_offset(skb);
435 /* In order to process neighbor discovery options, we need the
438 if (unlikely(icmp_len < sizeof(*nd)))
441 if (unlikely(skb_linearize(skb)))
444 nd = (struct nd_msg *)skb_transport_header(skb);
445 key->ipv6.nd.target = nd->target;
447 icmp_len -= sizeof(*nd);
449 while (icmp_len >= 8) {
450 struct nd_opt_hdr *nd_opt =
451 (struct nd_opt_hdr *)(nd->opt + offset);
452 int opt_len = nd_opt->nd_opt_len * 8;
454 if (unlikely(!opt_len || opt_len > icmp_len))
457 /* Store the link layer address if the appropriate
458 * option is provided. It is considered an error if
459 * the same link layer option is specified twice.
461 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
463 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
465 ether_addr_copy(key->ipv6.nd.sll,
466 &nd->opt[offset+sizeof(*nd_opt)]);
467 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
469 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
471 ether_addr_copy(key->ipv6.nd.tll,
472 &nd->opt[offset+sizeof(*nd_opt)]);
483 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
484 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
485 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
490 static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
493 unsigned int nh_ofs = skb_network_offset(skb);
497 err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
502 version = nsh_get_ver(nh);
503 length = nsh_hdr_len(nh);
508 err = check_header(skb, nh_ofs + length);
513 key->nsh.base.flags = nsh_get_flags(nh);
514 key->nsh.base.ttl = nsh_get_ttl(nh);
515 key->nsh.base.mdtype = nh->mdtype;
516 key->nsh.base.np = nh->np;
517 key->nsh.base.path_hdr = nh->path_hdr;
518 switch (key->nsh.base.mdtype) {
520 if (length != NSH_M_TYPE1_LEN)
522 memcpy(key->nsh.context, nh->md1.context,
526 memset(key->nsh.context, 0,
537 * key_extract - extracts a flow key from an Ethernet frame.
538 * @skb: sk_buff that contains the frame, with skb->data pointing to the
540 * @key: output flow key
542 * The caller must ensure that skb->len >= ETH_HLEN.
544 * Returns 0 if successful, otherwise a negative errno value.
546 * Initializes @skb header fields as follows:
548 * - skb->mac_header: the L2 header.
550 * - skb->network_header: just past the L2 header, or just past the
551 * VLAN header, to the first byte of the L2 payload.
553 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
554 * on output, then just past the IP header, if one is present and
555 * of a correct length, otherwise the same as skb->network_header.
556 * For other key->eth.type values it is left untouched.
558 * - skb->protocol: the type of the data starting at skb->network_header.
559 * Equals to key->eth.type.
561 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
566 /* Flags are always used as part of stats */
569 skb_reset_mac_header(skb);
573 if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
574 if (unlikely(eth_type_vlan(skb->protocol)))
577 skb_reset_network_header(skb);
578 key->eth.type = skb->protocol;
581 ether_addr_copy(key->eth.src, eth->h_source);
582 ether_addr_copy(key->eth.dst, eth->h_dest);
584 __skb_pull(skb, 2 * ETH_ALEN);
585 /* We are going to push all headers that we pull, so no need to
586 * update skb->csum here.
589 if (unlikely(parse_vlan(skb, key)))
592 key->eth.type = parse_ethertype(skb);
593 if (unlikely(key->eth.type == htons(0)))
596 /* Multiple tagged packets need to retain TPID to satisfy
597 * skb_vlan_pop(), which will later shift the ethertype into
600 if (key->eth.cvlan.tci & htons(VLAN_TAG_PRESENT))
601 skb->protocol = key->eth.cvlan.tpid;
603 skb->protocol = key->eth.type;
605 skb_reset_network_header(skb);
606 __skb_push(skb, skb->data - skb_mac_header(skb));
608 skb_reset_mac_len(skb);
611 if (key->eth.type == htons(ETH_P_IP)) {
615 error = check_iphdr(skb);
616 if (unlikely(error)) {
617 memset(&key->ip, 0, sizeof(key->ip));
618 memset(&key->ipv4, 0, sizeof(key->ipv4));
619 if (error == -EINVAL) {
620 skb->transport_header = skb->network_header;
627 key->ipv4.addr.src = nh->saddr;
628 key->ipv4.addr.dst = nh->daddr;
630 key->ip.proto = nh->protocol;
631 key->ip.tos = nh->tos;
632 key->ip.ttl = nh->ttl;
634 offset = nh->frag_off & htons(IP_OFFSET);
636 key->ip.frag = OVS_FRAG_TYPE_LATER;
639 if (nh->frag_off & htons(IP_MF) ||
640 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
641 key->ip.frag = OVS_FRAG_TYPE_FIRST;
643 key->ip.frag = OVS_FRAG_TYPE_NONE;
645 /* Transport layer. */
646 if (key->ip.proto == IPPROTO_TCP) {
647 if (tcphdr_ok(skb)) {
648 struct tcphdr *tcp = tcp_hdr(skb);
649 key->tp.src = tcp->source;
650 key->tp.dst = tcp->dest;
651 key->tp.flags = TCP_FLAGS_BE16(tcp);
653 memset(&key->tp, 0, sizeof(key->tp));
656 } else if (key->ip.proto == IPPROTO_UDP) {
657 if (udphdr_ok(skb)) {
658 struct udphdr *udp = udp_hdr(skb);
659 key->tp.src = udp->source;
660 key->tp.dst = udp->dest;
662 memset(&key->tp, 0, sizeof(key->tp));
664 } else if (key->ip.proto == IPPROTO_SCTP) {
665 if (sctphdr_ok(skb)) {
666 struct sctphdr *sctp = sctp_hdr(skb);
667 key->tp.src = sctp->source;
668 key->tp.dst = sctp->dest;
670 memset(&key->tp, 0, sizeof(key->tp));
672 } else if (key->ip.proto == IPPROTO_ICMP) {
673 if (icmphdr_ok(skb)) {
674 struct icmphdr *icmp = icmp_hdr(skb);
675 /* The ICMP type and code fields use the 16-bit
676 * transport port fields, so we need to store
677 * them in 16-bit network byte order. */
678 key->tp.src = htons(icmp->type);
679 key->tp.dst = htons(icmp->code);
681 memset(&key->tp, 0, sizeof(key->tp));
685 } else if (key->eth.type == htons(ETH_P_ARP) ||
686 key->eth.type == htons(ETH_P_RARP)) {
687 struct arp_eth_header *arp;
688 bool arp_available = arphdr_ok(skb);
690 arp = (struct arp_eth_header *)skb_network_header(skb);
693 arp->ar_hrd == htons(ARPHRD_ETHER) &&
694 arp->ar_pro == htons(ETH_P_IP) &&
695 arp->ar_hln == ETH_ALEN &&
698 /* We only match on the lower 8 bits of the opcode. */
699 if (ntohs(arp->ar_op) <= 0xff)
700 key->ip.proto = ntohs(arp->ar_op);
704 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
705 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
706 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
707 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
709 memset(&key->ip, 0, sizeof(key->ip));
710 memset(&key->ipv4, 0, sizeof(key->ipv4));
712 } else if (eth_p_mpls(key->eth.type)) {
713 size_t stack_len = MPLS_HLEN;
715 skb_set_inner_network_header(skb, skb->mac_len);
719 error = check_header(skb, skb->mac_len + stack_len);
723 memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
725 if (stack_len == MPLS_HLEN)
726 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
728 skb_set_inner_network_header(skb, skb->mac_len + stack_len);
729 if (lse & htonl(MPLS_LS_S_MASK))
732 stack_len += MPLS_HLEN;
734 } else if (key->eth.type == htons(ETH_P_IPV6)) {
735 int nh_len; /* IPv6 Header + Extensions */
737 nh_len = parse_ipv6hdr(skb, key);
738 if (unlikely(nh_len < 0)) {
741 memset(&key->ip, 0, sizeof(key->ip));
742 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
745 skb->transport_header = skb->network_header;
754 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
756 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
757 key->ip.frag = OVS_FRAG_TYPE_FIRST;
759 /* Transport layer. */
760 if (key->ip.proto == NEXTHDR_TCP) {
761 if (tcphdr_ok(skb)) {
762 struct tcphdr *tcp = tcp_hdr(skb);
763 key->tp.src = tcp->source;
764 key->tp.dst = tcp->dest;
765 key->tp.flags = TCP_FLAGS_BE16(tcp);
767 memset(&key->tp, 0, sizeof(key->tp));
769 } else if (key->ip.proto == NEXTHDR_UDP) {
770 if (udphdr_ok(skb)) {
771 struct udphdr *udp = udp_hdr(skb);
772 key->tp.src = udp->source;
773 key->tp.dst = udp->dest;
775 memset(&key->tp, 0, sizeof(key->tp));
777 } else if (key->ip.proto == NEXTHDR_SCTP) {
778 if (sctphdr_ok(skb)) {
779 struct sctphdr *sctp = sctp_hdr(skb);
780 key->tp.src = sctp->source;
781 key->tp.dst = sctp->dest;
783 memset(&key->tp, 0, sizeof(key->tp));
785 } else if (key->ip.proto == NEXTHDR_ICMP) {
786 if (icmp6hdr_ok(skb)) {
787 error = parse_icmpv6(skb, key, nh_len);
791 memset(&key->tp, 0, sizeof(key->tp));
794 } else if (key->eth.type == htons(ETH_P_NSH)) {
795 error = parse_nsh(skb, key);
802 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
806 res = key_extract(skb, key);
808 key->mac_proto &= ~SW_FLOW_KEY_INVALID;
813 static int key_extract_mac_proto(struct sk_buff *skb)
815 switch (skb->dev->type) {
817 return MAC_PROTO_ETHERNET;
819 if (skb->protocol == htons(ETH_P_TEB))
820 return MAC_PROTO_ETHERNET;
821 return MAC_PROTO_NONE;
827 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
828 struct sk_buff *skb, struct sw_flow_key *key)
832 /* Extract metadata from packet. */
834 key->tun_proto = ip_tunnel_info_af(tun_info);
835 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
837 if (tun_info->options_len) {
838 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
840 > sizeof(key->tun_opts));
842 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
844 key->tun_opts_len = tun_info->options_len;
846 key->tun_opts_len = 0;
850 key->tun_opts_len = 0;
851 memset(&key->tun_key, 0, sizeof(key->tun_key));
854 key->phy.priority = skb->priority;
855 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
856 key->phy.skb_mark = skb->mark;
857 key->ovs_flow_hash = 0;
858 res = key_extract_mac_proto(skb);
861 key->mac_proto = res;
864 err = key_extract(skb, key);
866 ovs_ct_fill_key(skb, key); /* Must be after key_extract(). */
870 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
872 struct sw_flow_key *key, bool log)
874 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
878 err = parse_flow_nlattrs(attr, a, &attrs, log);
882 /* Extract metadata from netlink attributes. */
883 err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
887 /* key_extract assumes that skb->protocol is set-up for
888 * layer 3 packets which is the case for other callers,
889 * in particular packets received from the network stack.
890 * Here the correct value can be set from the metadata
892 * For L2 packet key eth type would be zero. skb protocol
893 * would be set to correct value later during key-extact.
896 skb->protocol = key->eth.type;
897 err = key_extract(skb, key);
901 /* Check that we have conntrack original direction tuple metadata only
902 * for packets for which it makes sense. Otherwise the key may be
903 * corrupted due to overlapping key fields.
905 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
906 key->eth.type != htons(ETH_P_IP))
908 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
909 (key->eth.type != htons(ETH_P_IPV6) ||
910 sw_flow_key_is_nd(key)))