1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (c) 2007-2014 Nicira, Inc.
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>
18 #include <linux/rcupdate.h>
19 #include <linux/cpumask.h>
20 #include <linux/if_arp.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>
32 #include <net/ip_tunnels.h>
35 #include <net/ndisc.h>
37 #include <net/netfilter/nf_conntrack_zones.h>
39 #include "conntrack.h"
42 #include "flow_netlink.h"
45 u64 ovs_flow_used_time(unsigned long flow_jiffies)
47 struct timespec64 cur_ts;
50 ktime_get_ts64(&cur_ts);
51 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
52 cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
53 cur_ts.tv_nsec / NSEC_PER_MSEC;
55 return cur_ms - idle_ms;
58 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
60 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
61 const struct sk_buff *skb)
63 struct sw_flow_stats *stats;
64 unsigned int cpu = smp_processor_id();
65 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
67 stats = rcu_dereference(flow->stats[cpu]);
69 /* Check if already have CPU-specific stats. */
71 spin_lock(&stats->lock);
72 /* Mark if we write on the pre-allocated stats. */
73 if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
74 flow->stats_last_writer = cpu;
76 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
77 spin_lock(&stats->lock);
79 /* If the current CPU is the only writer on the
80 * pre-allocated stats keep using them.
82 if (unlikely(flow->stats_last_writer != cpu)) {
83 /* A previous locker may have already allocated the
84 * stats, so we need to check again. If CPU-specific
85 * stats were already allocated, we update the pre-
86 * allocated stats as we have already locked them.
88 if (likely(flow->stats_last_writer != -1) &&
89 likely(!rcu_access_pointer(flow->stats[cpu]))) {
90 /* Try to allocate CPU-specific stats. */
91 struct sw_flow_stats *new_stats;
94 kmem_cache_alloc_node(flow_stats_cache,
100 if (likely(new_stats)) {
101 new_stats->used = jiffies;
102 new_stats->packet_count = 1;
103 new_stats->byte_count = len;
104 new_stats->tcp_flags = tcp_flags;
105 spin_lock_init(&new_stats->lock);
107 rcu_assign_pointer(flow->stats[cpu],
109 cpumask_set_cpu(cpu, &flow->cpu_used_mask);
113 flow->stats_last_writer = cpu;
117 stats->used = jiffies;
118 stats->packet_count++;
119 stats->byte_count += len;
120 stats->tcp_flags |= tcp_flags;
122 spin_unlock(&stats->lock);
125 /* Must be called with rcu_read_lock or ovs_mutex. */
126 void ovs_flow_stats_get(const struct sw_flow *flow,
127 struct ovs_flow_stats *ovs_stats,
128 unsigned long *used, __be16 *tcp_flags)
134 memset(ovs_stats, 0, sizeof(*ovs_stats));
136 /* We open code this to make sure cpu 0 is always considered */
137 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
138 struct sw_flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
141 /* Local CPU may write on non-local stats, so we must
142 * block bottom-halves here.
144 spin_lock_bh(&stats->lock);
145 if (!*used || time_after(stats->used, *used))
147 *tcp_flags |= stats->tcp_flags;
148 ovs_stats->n_packets += stats->packet_count;
149 ovs_stats->n_bytes += stats->byte_count;
150 spin_unlock_bh(&stats->lock);
155 /* Called with ovs_mutex. */
156 void ovs_flow_stats_clear(struct sw_flow *flow)
160 /* We open code this to make sure cpu 0 is always considered */
161 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
162 struct sw_flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
165 spin_lock_bh(&stats->lock);
167 stats->packet_count = 0;
168 stats->byte_count = 0;
169 stats->tcp_flags = 0;
170 spin_unlock_bh(&stats->lock);
175 static int check_header(struct sk_buff *skb, int len)
177 if (unlikely(skb->len < len))
179 if (unlikely(!pskb_may_pull(skb, len)))
184 static bool arphdr_ok(struct sk_buff *skb)
186 return pskb_may_pull(skb, skb_network_offset(skb) +
187 sizeof(struct arp_eth_header));
190 static int check_iphdr(struct sk_buff *skb)
192 unsigned int nh_ofs = skb_network_offset(skb);
196 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
200 ip_len = ip_hdrlen(skb);
201 if (unlikely(ip_len < sizeof(struct iphdr) ||
202 skb->len < nh_ofs + ip_len))
205 skb_set_transport_header(skb, nh_ofs + ip_len);
209 static bool tcphdr_ok(struct sk_buff *skb)
211 int th_ofs = skb_transport_offset(skb);
214 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
217 tcp_len = tcp_hdrlen(skb);
218 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
219 skb->len < th_ofs + tcp_len))
225 static bool udphdr_ok(struct sk_buff *skb)
227 return pskb_may_pull(skb, skb_transport_offset(skb) +
228 sizeof(struct udphdr));
231 static bool sctphdr_ok(struct sk_buff *skb)
233 return pskb_may_pull(skb, skb_transport_offset(skb) +
234 sizeof(struct sctphdr));
237 static bool icmphdr_ok(struct sk_buff *skb)
239 return pskb_may_pull(skb, skb_transport_offset(skb) +
240 sizeof(struct icmphdr));
243 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
245 unsigned short frag_off;
246 unsigned int payload_ofs = 0;
247 unsigned int nh_ofs = skb_network_offset(skb);
250 int err, nexthdr, flags = 0;
252 err = check_header(skb, nh_ofs + sizeof(*nh));
258 key->ip.proto = NEXTHDR_NONE;
259 key->ip.tos = ipv6_get_dsfield(nh);
260 key->ip.ttl = nh->hop_limit;
261 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
262 key->ipv6.addr.src = nh->saddr;
263 key->ipv6.addr.dst = nh->daddr;
265 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
266 if (flags & IP6_FH_F_FRAG) {
268 key->ip.frag = OVS_FRAG_TYPE_LATER;
269 key->ip.proto = nexthdr;
272 key->ip.frag = OVS_FRAG_TYPE_FIRST;
274 key->ip.frag = OVS_FRAG_TYPE_NONE;
277 /* Delayed handling of error in ipv6_find_hdr() as it
278 * always sets flags and frag_off to a valid value which may be
279 * used to set key->ip.frag above.
281 if (unlikely(nexthdr < 0))
284 nh_len = payload_ofs - nh_ofs;
285 skb_set_transport_header(skb, nh_ofs + nh_len);
286 key->ip.proto = nexthdr;
290 static bool icmp6hdr_ok(struct sk_buff *skb)
292 return pskb_may_pull(skb, skb_transport_offset(skb) +
293 sizeof(struct icmp6hdr));
297 * parse_vlan_tag - Parse vlan tag from vlan header.
298 * @skb: skb containing frame to parse
299 * @key_vh: pointer to parsed vlan tag
300 * @untag_vlan: should the vlan header be removed from the frame
302 * Return: ERROR on memory error.
303 * %0 if it encounters a non-vlan or incomplete packet.
304 * %1 after successfully parsing vlan tag.
306 static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
309 struct vlan_head *vh = (struct vlan_head *)skb->data;
311 if (likely(!eth_type_vlan(vh->tpid)))
314 if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
317 if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
321 vh = (struct vlan_head *)skb->data;
322 key_vh->tci = vh->tci | htons(VLAN_CFI_MASK);
323 key_vh->tpid = vh->tpid;
325 if (unlikely(untag_vlan)) {
326 int offset = skb->data - skb_mac_header(skb);
330 __skb_push(skb, offset);
331 err = __skb_vlan_pop(skb, &tci);
332 __skb_pull(skb, offset);
335 __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
337 __skb_pull(skb, sizeof(struct vlan_head));
342 static void clear_vlan(struct sw_flow_key *key)
344 key->eth.vlan.tci = 0;
345 key->eth.vlan.tpid = 0;
346 key->eth.cvlan.tci = 0;
347 key->eth.cvlan.tpid = 0;
350 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
354 if (skb_vlan_tag_present(skb)) {
355 key->eth.vlan.tci = htons(skb->vlan_tci) | htons(VLAN_CFI_MASK);
356 key->eth.vlan.tpid = skb->vlan_proto;
358 /* Parse outer vlan tag in the non-accelerated case. */
359 res = parse_vlan_tag(skb, &key->eth.vlan, true);
364 /* Parse inner vlan tag. */
365 res = parse_vlan_tag(skb, &key->eth.cvlan, false);
372 static __be16 parse_ethertype(struct sk_buff *skb)
374 struct llc_snap_hdr {
375 u8 dsap; /* Always 0xAA */
376 u8 ssap; /* Always 0xAA */
381 struct llc_snap_hdr *llc;
384 proto = *(__be16 *) skb->data;
385 __skb_pull(skb, sizeof(__be16));
387 if (eth_proto_is_802_3(proto))
390 if (skb->len < sizeof(struct llc_snap_hdr))
391 return htons(ETH_P_802_2);
393 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
396 llc = (struct llc_snap_hdr *) skb->data;
397 if (llc->dsap != LLC_SAP_SNAP ||
398 llc->ssap != LLC_SAP_SNAP ||
399 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
400 return htons(ETH_P_802_2);
402 __skb_pull(skb, sizeof(struct llc_snap_hdr));
404 if (eth_proto_is_802_3(llc->ethertype))
405 return llc->ethertype;
407 return htons(ETH_P_802_2);
410 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
413 struct icmp6hdr *icmp = icmp6_hdr(skb);
415 /* The ICMPv6 type and code fields use the 16-bit transport port
416 * fields, so we need to store them in 16-bit network byte order.
418 key->tp.src = htons(icmp->icmp6_type);
419 key->tp.dst = htons(icmp->icmp6_code);
420 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
422 if (icmp->icmp6_code == 0 &&
423 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
424 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
425 int icmp_len = skb->len - skb_transport_offset(skb);
429 /* In order to process neighbor discovery options, we need the
432 if (unlikely(icmp_len < sizeof(*nd)))
435 if (unlikely(skb_linearize(skb)))
438 nd = (struct nd_msg *)skb_transport_header(skb);
439 key->ipv6.nd.target = nd->target;
441 icmp_len -= sizeof(*nd);
443 while (icmp_len >= 8) {
444 struct nd_opt_hdr *nd_opt =
445 (struct nd_opt_hdr *)(nd->opt + offset);
446 int opt_len = nd_opt->nd_opt_len * 8;
448 if (unlikely(!opt_len || opt_len > icmp_len))
451 /* Store the link layer address if the appropriate
452 * option is provided. It is considered an error if
453 * the same link layer option is specified twice.
455 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
457 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
459 ether_addr_copy(key->ipv6.nd.sll,
460 &nd->opt[offset+sizeof(*nd_opt)]);
461 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
463 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
465 ether_addr_copy(key->ipv6.nd.tll,
466 &nd->opt[offset+sizeof(*nd_opt)]);
477 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
478 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
479 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
484 static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
487 unsigned int nh_ofs = skb_network_offset(skb);
491 err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
496 version = nsh_get_ver(nh);
497 length = nsh_hdr_len(nh);
502 err = check_header(skb, nh_ofs + length);
507 key->nsh.base.flags = nsh_get_flags(nh);
508 key->nsh.base.ttl = nsh_get_ttl(nh);
509 key->nsh.base.mdtype = nh->mdtype;
510 key->nsh.base.np = nh->np;
511 key->nsh.base.path_hdr = nh->path_hdr;
512 switch (key->nsh.base.mdtype) {
514 if (length != NSH_M_TYPE1_LEN)
516 memcpy(key->nsh.context, nh->md1.context,
520 memset(key->nsh.context, 0,
531 * key_extract_l3l4 - extracts L3/L4 header information.
532 * @skb: sk_buff that contains the frame, with skb->data pointing to the
534 * @key: output flow key
536 * Return: %0 if successful, otherwise a negative errno value.
538 static int key_extract_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
543 if (key->eth.type == htons(ETH_P_IP)) {
547 error = check_iphdr(skb);
548 if (unlikely(error)) {
549 memset(&key->ip, 0, sizeof(key->ip));
550 memset(&key->ipv4, 0, sizeof(key->ipv4));
551 if (error == -EINVAL) {
552 skb->transport_header = skb->network_header;
559 key->ipv4.addr.src = nh->saddr;
560 key->ipv4.addr.dst = nh->daddr;
562 key->ip.proto = nh->protocol;
563 key->ip.tos = nh->tos;
564 key->ip.ttl = nh->ttl;
566 offset = nh->frag_off & htons(IP_OFFSET);
568 key->ip.frag = OVS_FRAG_TYPE_LATER;
569 memset(&key->tp, 0, sizeof(key->tp));
572 if (nh->frag_off & htons(IP_MF) ||
573 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
574 key->ip.frag = OVS_FRAG_TYPE_FIRST;
576 key->ip.frag = OVS_FRAG_TYPE_NONE;
578 /* Transport layer. */
579 if (key->ip.proto == IPPROTO_TCP) {
580 if (tcphdr_ok(skb)) {
581 struct tcphdr *tcp = tcp_hdr(skb);
582 key->tp.src = tcp->source;
583 key->tp.dst = tcp->dest;
584 key->tp.flags = TCP_FLAGS_BE16(tcp);
586 memset(&key->tp, 0, sizeof(key->tp));
589 } else if (key->ip.proto == IPPROTO_UDP) {
590 if (udphdr_ok(skb)) {
591 struct udphdr *udp = udp_hdr(skb);
592 key->tp.src = udp->source;
593 key->tp.dst = udp->dest;
595 memset(&key->tp, 0, sizeof(key->tp));
597 } else if (key->ip.proto == IPPROTO_SCTP) {
598 if (sctphdr_ok(skb)) {
599 struct sctphdr *sctp = sctp_hdr(skb);
600 key->tp.src = sctp->source;
601 key->tp.dst = sctp->dest;
603 memset(&key->tp, 0, sizeof(key->tp));
605 } else if (key->ip.proto == IPPROTO_ICMP) {
606 if (icmphdr_ok(skb)) {
607 struct icmphdr *icmp = icmp_hdr(skb);
608 /* The ICMP type and code fields use the 16-bit
609 * transport port fields, so we need to store
610 * them in 16-bit network byte order. */
611 key->tp.src = htons(icmp->type);
612 key->tp.dst = htons(icmp->code);
614 memset(&key->tp, 0, sizeof(key->tp));
618 } else if (key->eth.type == htons(ETH_P_ARP) ||
619 key->eth.type == htons(ETH_P_RARP)) {
620 struct arp_eth_header *arp;
621 bool arp_available = arphdr_ok(skb);
623 arp = (struct arp_eth_header *)skb_network_header(skb);
626 arp->ar_hrd == htons(ARPHRD_ETHER) &&
627 arp->ar_pro == htons(ETH_P_IP) &&
628 arp->ar_hln == ETH_ALEN &&
631 /* We only match on the lower 8 bits of the opcode. */
632 if (ntohs(arp->ar_op) <= 0xff)
633 key->ip.proto = ntohs(arp->ar_op);
637 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
638 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
639 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
640 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
642 memset(&key->ip, 0, sizeof(key->ip));
643 memset(&key->ipv4, 0, sizeof(key->ipv4));
645 } else if (eth_p_mpls(key->eth.type)) {
648 memset(&key->mpls, 0, sizeof(key->mpls));
649 skb_set_inner_network_header(skb, skb->mac_len);
653 error = check_header(skb, skb->mac_len +
654 label_count * MPLS_HLEN);
658 memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
660 if (label_count <= MPLS_LABEL_DEPTH)
661 memcpy(&key->mpls.lse[label_count - 1], &lse,
664 skb_set_inner_network_header(skb, skb->mac_len +
665 label_count * MPLS_HLEN);
666 if (lse & htonl(MPLS_LS_S_MASK))
671 if (label_count > MPLS_LABEL_DEPTH)
672 label_count = MPLS_LABEL_DEPTH;
674 key->mpls.num_labels_mask = GENMASK(label_count - 1, 0);
675 } else if (key->eth.type == htons(ETH_P_IPV6)) {
676 int nh_len; /* IPv6 Header + Extensions */
678 nh_len = parse_ipv6hdr(skb, key);
679 if (unlikely(nh_len < 0)) {
682 memset(&key->ip, 0, sizeof(key->ip));
683 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
686 skb->transport_header = skb->network_header;
695 if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
696 memset(&key->tp, 0, sizeof(key->tp));
699 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
700 key->ip.frag = OVS_FRAG_TYPE_FIRST;
702 /* Transport layer. */
703 if (key->ip.proto == NEXTHDR_TCP) {
704 if (tcphdr_ok(skb)) {
705 struct tcphdr *tcp = tcp_hdr(skb);
706 key->tp.src = tcp->source;
707 key->tp.dst = tcp->dest;
708 key->tp.flags = TCP_FLAGS_BE16(tcp);
710 memset(&key->tp, 0, sizeof(key->tp));
712 } else if (key->ip.proto == NEXTHDR_UDP) {
713 if (udphdr_ok(skb)) {
714 struct udphdr *udp = udp_hdr(skb);
715 key->tp.src = udp->source;
716 key->tp.dst = udp->dest;
718 memset(&key->tp, 0, sizeof(key->tp));
720 } else if (key->ip.proto == NEXTHDR_SCTP) {
721 if (sctphdr_ok(skb)) {
722 struct sctphdr *sctp = sctp_hdr(skb);
723 key->tp.src = sctp->source;
724 key->tp.dst = sctp->dest;
726 memset(&key->tp, 0, sizeof(key->tp));
728 } else if (key->ip.proto == NEXTHDR_ICMP) {
729 if (icmp6hdr_ok(skb)) {
730 error = parse_icmpv6(skb, key, nh_len);
734 memset(&key->tp, 0, sizeof(key->tp));
737 } else if (key->eth.type == htons(ETH_P_NSH)) {
738 error = parse_nsh(skb, key);
746 * key_extract - extracts a flow key from an Ethernet frame.
747 * @skb: sk_buff that contains the frame, with skb->data pointing to the
749 * @key: output flow key
751 * The caller must ensure that skb->len >= ETH_HLEN.
753 * Initializes @skb header fields as follows:
755 * - skb->mac_header: the L2 header.
757 * - skb->network_header: just past the L2 header, or just past the
758 * VLAN header, to the first byte of the L2 payload.
760 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
761 * on output, then just past the IP header, if one is present and
762 * of a correct length, otherwise the same as skb->network_header.
763 * For other key->eth.type values it is left untouched.
765 * - skb->protocol: the type of the data starting at skb->network_header.
766 * Equals to key->eth.type.
768 * Return: %0 if successful, otherwise a negative errno value.
770 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
774 /* Flags are always used as part of stats */
777 skb_reset_mac_header(skb);
781 if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
782 if (unlikely(eth_type_vlan(skb->protocol)))
785 skb_reset_network_header(skb);
786 key->eth.type = skb->protocol;
789 ether_addr_copy(key->eth.src, eth->h_source);
790 ether_addr_copy(key->eth.dst, eth->h_dest);
792 __skb_pull(skb, 2 * ETH_ALEN);
793 /* We are going to push all headers that we pull, so no need to
794 * update skb->csum here.
797 if (unlikely(parse_vlan(skb, key)))
800 key->eth.type = parse_ethertype(skb);
801 if (unlikely(key->eth.type == htons(0)))
804 /* Multiple tagged packets need to retain TPID to satisfy
805 * skb_vlan_pop(), which will later shift the ethertype into
808 if (key->eth.cvlan.tci & htons(VLAN_CFI_MASK))
809 skb->protocol = key->eth.cvlan.tpid;
811 skb->protocol = key->eth.type;
813 skb_reset_network_header(skb);
814 __skb_push(skb, skb->data - skb_mac_header(skb));
817 skb_reset_mac_len(skb);
819 /* Fill out L3/L4 key info, if any */
820 return key_extract_l3l4(skb, key);
823 /* In the case of conntrack fragment handling it expects L3 headers,
826 int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
828 return key_extract_l3l4(skb, key);
831 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
835 res = key_extract(skb, key);
837 key->mac_proto &= ~SW_FLOW_KEY_INVALID;
842 static int key_extract_mac_proto(struct sk_buff *skb)
844 switch (skb->dev->type) {
846 return MAC_PROTO_ETHERNET;
848 if (skb->protocol == htons(ETH_P_TEB))
849 return MAC_PROTO_ETHERNET;
850 return MAC_PROTO_NONE;
856 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
857 struct sk_buff *skb, struct sw_flow_key *key)
859 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
860 struct tc_skb_ext *tc_ext;
862 bool post_ct = false, post_ct_snat = false, post_ct_dnat = false;
866 /* Extract metadata from packet. */
868 key->tun_proto = ip_tunnel_info_af(tun_info);
869 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
871 if (tun_info->options_len) {
872 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
874 > sizeof(key->tun_opts));
876 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
878 key->tun_opts_len = tun_info->options_len;
880 key->tun_opts_len = 0;
884 key->tun_opts_len = 0;
885 memset(&key->tun_key, 0, sizeof(key->tun_key));
888 key->phy.priority = skb->priority;
889 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
890 key->phy.skb_mark = skb->mark;
891 key->ovs_flow_hash = 0;
892 res = key_extract_mac_proto(skb);
895 key->mac_proto = res;
897 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
898 if (static_branch_unlikely(&tc_recirc_sharing_support)) {
899 tc_ext = skb_ext_find(skb, TC_SKB_EXT);
900 key->recirc_id = tc_ext ? tc_ext->chain : 0;
901 OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
902 post_ct = tc_ext ? tc_ext->post_ct : false;
903 post_ct_snat = post_ct ? tc_ext->post_ct_snat : false;
904 post_ct_dnat = post_ct ? tc_ext->post_ct_dnat : false;
905 zone = post_ct ? tc_ext->zone : 0;
913 err = key_extract(skb, key);
915 ovs_ct_fill_key(skb, key, post_ct); /* Must be after key_extract(). */
917 if (!skb_get_nfct(skb)) {
921 key->ct_state &= ~OVS_CS_F_DST_NAT;
923 key->ct_state &= ~OVS_CS_F_SRC_NAT;
930 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
932 struct sw_flow_key *key, bool log)
934 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
938 err = parse_flow_nlattrs(attr, a, &attrs, log);
942 /* Extract metadata from netlink attributes. */
943 err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
947 /* key_extract assumes that skb->protocol is set-up for
948 * layer 3 packets which is the case for other callers,
949 * in particular packets received from the network stack.
950 * Here the correct value can be set from the metadata
952 * For L2 packet key eth type would be zero. skb protocol
953 * would be set to correct value later during key-extact.
956 skb->protocol = key->eth.type;
957 err = key_extract(skb, key);
961 /* Check that we have conntrack original direction tuple metadata only
962 * for packets for which it makes sense. Otherwise the key may be
963 * corrupted due to overlapping key fields.
965 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
966 key->eth.type != htons(ETH_P_IP))
968 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
969 (key->eth.type != htons(ETH_P_IPV6) ||
970 sw_flow_key_is_nd(key)))