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>
38 #include "conntrack.h"
41 #include "flow_netlink.h"
44 u64 ovs_flow_used_time(unsigned long flow_jiffies)
46 struct timespec64 cur_ts;
49 ktime_get_ts64(&cur_ts);
50 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
51 cur_ms = (u64)(u32)cur_ts.tv_sec * MSEC_PER_SEC +
52 cur_ts.tv_nsec / NSEC_PER_MSEC;
54 return cur_ms - idle_ms;
57 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
59 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
60 const struct sk_buff *skb)
62 struct sw_flow_stats *stats;
63 unsigned int cpu = smp_processor_id();
64 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
66 stats = rcu_dereference(flow->stats[cpu]);
68 /* Check if already have CPU-specific stats. */
70 spin_lock(&stats->lock);
71 /* Mark if we write on the pre-allocated stats. */
72 if (cpu == 0 && unlikely(flow->stats_last_writer != cpu))
73 flow->stats_last_writer = cpu;
75 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
76 spin_lock(&stats->lock);
78 /* If the current CPU is the only writer on the
79 * pre-allocated stats keep using them.
81 if (unlikely(flow->stats_last_writer != cpu)) {
82 /* A previous locker may have already allocated the
83 * stats, so we need to check again. If CPU-specific
84 * stats were already allocated, we update the pre-
85 * allocated stats as we have already locked them.
87 if (likely(flow->stats_last_writer != -1) &&
88 likely(!rcu_access_pointer(flow->stats[cpu]))) {
89 /* Try to allocate CPU-specific stats. */
90 struct sw_flow_stats *new_stats;
93 kmem_cache_alloc_node(flow_stats_cache,
99 if (likely(new_stats)) {
100 new_stats->used = jiffies;
101 new_stats->packet_count = 1;
102 new_stats->byte_count = len;
103 new_stats->tcp_flags = tcp_flags;
104 spin_lock_init(&new_stats->lock);
106 rcu_assign_pointer(flow->stats[cpu],
108 cpumask_set_cpu(cpu, &flow->cpu_used_mask);
112 flow->stats_last_writer = cpu;
116 stats->used = jiffies;
117 stats->packet_count++;
118 stats->byte_count += len;
119 stats->tcp_flags |= tcp_flags;
121 spin_unlock(&stats->lock);
124 /* Must be called with rcu_read_lock or ovs_mutex. */
125 void ovs_flow_stats_get(const struct sw_flow *flow,
126 struct ovs_flow_stats *ovs_stats,
127 unsigned long *used, __be16 *tcp_flags)
133 memset(ovs_stats, 0, sizeof(*ovs_stats));
135 /* We open code this to make sure cpu 0 is always considered */
136 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
137 struct sw_flow_stats *stats = rcu_dereference_ovsl(flow->stats[cpu]);
140 /* Local CPU may write on non-local stats, so we must
141 * block bottom-halves here.
143 spin_lock_bh(&stats->lock);
144 if (!*used || time_after(stats->used, *used))
146 *tcp_flags |= stats->tcp_flags;
147 ovs_stats->n_packets += stats->packet_count;
148 ovs_stats->n_bytes += stats->byte_count;
149 spin_unlock_bh(&stats->lock);
154 /* Called with ovs_mutex. */
155 void ovs_flow_stats_clear(struct sw_flow *flow)
159 /* We open code this to make sure cpu 0 is always considered */
160 for (cpu = 0; cpu < nr_cpu_ids; cpu = cpumask_next(cpu, &flow->cpu_used_mask)) {
161 struct sw_flow_stats *stats = ovsl_dereference(flow->stats[cpu]);
164 spin_lock_bh(&stats->lock);
166 stats->packet_count = 0;
167 stats->byte_count = 0;
168 stats->tcp_flags = 0;
169 spin_unlock_bh(&stats->lock);
174 static int check_header(struct sk_buff *skb, int len)
176 if (unlikely(skb->len < len))
178 if (unlikely(!pskb_may_pull(skb, len)))
183 static bool arphdr_ok(struct sk_buff *skb)
185 return pskb_may_pull(skb, skb_network_offset(skb) +
186 sizeof(struct arp_eth_header));
189 static int check_iphdr(struct sk_buff *skb)
191 unsigned int nh_ofs = skb_network_offset(skb);
195 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
199 ip_len = ip_hdrlen(skb);
200 if (unlikely(ip_len < sizeof(struct iphdr) ||
201 skb->len < nh_ofs + ip_len))
204 skb_set_transport_header(skb, nh_ofs + ip_len);
208 static bool tcphdr_ok(struct sk_buff *skb)
210 int th_ofs = skb_transport_offset(skb);
213 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
216 tcp_len = tcp_hdrlen(skb);
217 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
218 skb->len < th_ofs + tcp_len))
224 static bool udphdr_ok(struct sk_buff *skb)
226 return pskb_may_pull(skb, skb_transport_offset(skb) +
227 sizeof(struct udphdr));
230 static bool sctphdr_ok(struct sk_buff *skb)
232 return pskb_may_pull(skb, skb_transport_offset(skb) +
233 sizeof(struct sctphdr));
236 static bool icmphdr_ok(struct sk_buff *skb)
238 return pskb_may_pull(skb, skb_transport_offset(skb) +
239 sizeof(struct icmphdr));
242 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
244 unsigned short frag_off;
245 unsigned int payload_ofs = 0;
246 unsigned int nh_ofs = skb_network_offset(skb);
249 int err, nexthdr, flags = 0;
251 err = check_header(skb, nh_ofs + sizeof(*nh));
257 key->ip.proto = NEXTHDR_NONE;
258 key->ip.tos = ipv6_get_dsfield(nh);
259 key->ip.ttl = nh->hop_limit;
260 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
261 key->ipv6.addr.src = nh->saddr;
262 key->ipv6.addr.dst = nh->daddr;
264 nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
265 if (flags & IP6_FH_F_FRAG) {
267 key->ip.frag = OVS_FRAG_TYPE_LATER;
268 key->ip.proto = nexthdr;
271 key->ip.frag = OVS_FRAG_TYPE_FIRST;
273 key->ip.frag = OVS_FRAG_TYPE_NONE;
276 /* Delayed handling of error in ipv6_find_hdr() as it
277 * always sets flags and frag_off to a valid value which may be
278 * used to set key->ip.frag above.
280 if (unlikely(nexthdr < 0))
283 nh_len = payload_ofs - nh_ofs;
284 skb_set_transport_header(skb, nh_ofs + nh_len);
285 key->ip.proto = nexthdr;
289 static bool icmp6hdr_ok(struct sk_buff *skb)
291 return pskb_may_pull(skb, skb_transport_offset(skb) +
292 sizeof(struct icmp6hdr));
296 * Parse vlan tag from vlan header.
297 * @skb: skb containing frame to parse
298 * @key_vh: pointer to parsed vlan tag
299 * @untag_vlan: should the vlan header be removed from the frame
301 * Returns ERROR on memory error.
302 * Returns 0 if it encounters a non-vlan or incomplete packet.
303 * Returns 1 after successfully parsing vlan tag.
305 static int parse_vlan_tag(struct sk_buff *skb, struct vlan_head *key_vh,
308 struct vlan_head *vh = (struct vlan_head *)skb->data;
310 if (likely(!eth_type_vlan(vh->tpid)))
313 if (unlikely(skb->len < sizeof(struct vlan_head) + sizeof(__be16)))
316 if (unlikely(!pskb_may_pull(skb, sizeof(struct vlan_head) +
320 vh = (struct vlan_head *)skb->data;
321 key_vh->tci = vh->tci | htons(VLAN_CFI_MASK);
322 key_vh->tpid = vh->tpid;
324 if (unlikely(untag_vlan)) {
325 int offset = skb->data - skb_mac_header(skb);
329 __skb_push(skb, offset);
330 err = __skb_vlan_pop(skb, &tci);
331 __skb_pull(skb, offset);
334 __vlan_hwaccel_put_tag(skb, key_vh->tpid, tci);
336 __skb_pull(skb, sizeof(struct vlan_head));
341 static void clear_vlan(struct sw_flow_key *key)
343 key->eth.vlan.tci = 0;
344 key->eth.vlan.tpid = 0;
345 key->eth.cvlan.tci = 0;
346 key->eth.cvlan.tpid = 0;
349 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
353 if (skb_vlan_tag_present(skb)) {
354 key->eth.vlan.tci = htons(skb->vlan_tci) | htons(VLAN_CFI_MASK);
355 key->eth.vlan.tpid = skb->vlan_proto;
357 /* Parse outer vlan tag in the non-accelerated case. */
358 res = parse_vlan_tag(skb, &key->eth.vlan, true);
363 /* Parse inner vlan tag. */
364 res = parse_vlan_tag(skb, &key->eth.cvlan, false);
371 static __be16 parse_ethertype(struct sk_buff *skb)
373 struct llc_snap_hdr {
374 u8 dsap; /* Always 0xAA */
375 u8 ssap; /* Always 0xAA */
380 struct llc_snap_hdr *llc;
383 proto = *(__be16 *) skb->data;
384 __skb_pull(skb, sizeof(__be16));
386 if (eth_proto_is_802_3(proto))
389 if (skb->len < sizeof(struct llc_snap_hdr))
390 return htons(ETH_P_802_2);
392 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
395 llc = (struct llc_snap_hdr *) skb->data;
396 if (llc->dsap != LLC_SAP_SNAP ||
397 llc->ssap != LLC_SAP_SNAP ||
398 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
399 return htons(ETH_P_802_2);
401 __skb_pull(skb, sizeof(struct llc_snap_hdr));
403 if (eth_proto_is_802_3(llc->ethertype))
404 return llc->ethertype;
406 return htons(ETH_P_802_2);
409 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
412 struct icmp6hdr *icmp = icmp6_hdr(skb);
414 /* The ICMPv6 type and code fields use the 16-bit transport port
415 * fields, so we need to store them in 16-bit network byte order.
417 key->tp.src = htons(icmp->icmp6_type);
418 key->tp.dst = htons(icmp->icmp6_code);
419 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
421 if (icmp->icmp6_code == 0 &&
422 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
423 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
424 int icmp_len = skb->len - skb_transport_offset(skb);
428 /* In order to process neighbor discovery options, we need the
431 if (unlikely(icmp_len < sizeof(*nd)))
434 if (unlikely(skb_linearize(skb)))
437 nd = (struct nd_msg *)skb_transport_header(skb);
438 key->ipv6.nd.target = nd->target;
440 icmp_len -= sizeof(*nd);
442 while (icmp_len >= 8) {
443 struct nd_opt_hdr *nd_opt =
444 (struct nd_opt_hdr *)(nd->opt + offset);
445 int opt_len = nd_opt->nd_opt_len * 8;
447 if (unlikely(!opt_len || opt_len > icmp_len))
450 /* Store the link layer address if the appropriate
451 * option is provided. It is considered an error if
452 * the same link layer option is specified twice.
454 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
456 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
458 ether_addr_copy(key->ipv6.nd.sll,
459 &nd->opt[offset+sizeof(*nd_opt)]);
460 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
462 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
464 ether_addr_copy(key->ipv6.nd.tll,
465 &nd->opt[offset+sizeof(*nd_opt)]);
476 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
477 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
478 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
483 static int parse_nsh(struct sk_buff *skb, struct sw_flow_key *key)
486 unsigned int nh_ofs = skb_network_offset(skb);
490 err = check_header(skb, nh_ofs + NSH_BASE_HDR_LEN);
495 version = nsh_get_ver(nh);
496 length = nsh_hdr_len(nh);
501 err = check_header(skb, nh_ofs + length);
506 key->nsh.base.flags = nsh_get_flags(nh);
507 key->nsh.base.ttl = nsh_get_ttl(nh);
508 key->nsh.base.mdtype = nh->mdtype;
509 key->nsh.base.np = nh->np;
510 key->nsh.base.path_hdr = nh->path_hdr;
511 switch (key->nsh.base.mdtype) {
513 if (length != NSH_M_TYPE1_LEN)
515 memcpy(key->nsh.context, nh->md1.context,
519 memset(key->nsh.context, 0,
530 * key_extract_l3l4 - extracts L3/L4 header information.
531 * @skb: sk_buff that contains the frame, with skb->data pointing to the
533 * @key: output flow key
536 static int key_extract_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
541 if (key->eth.type == htons(ETH_P_IP)) {
545 error = check_iphdr(skb);
546 if (unlikely(error)) {
547 memset(&key->ip, 0, sizeof(key->ip));
548 memset(&key->ipv4, 0, sizeof(key->ipv4));
549 if (error == -EINVAL) {
550 skb->transport_header = skb->network_header;
557 key->ipv4.addr.src = nh->saddr;
558 key->ipv4.addr.dst = nh->daddr;
560 key->ip.proto = nh->protocol;
561 key->ip.tos = nh->tos;
562 key->ip.ttl = nh->ttl;
564 offset = nh->frag_off & htons(IP_OFFSET);
566 key->ip.frag = OVS_FRAG_TYPE_LATER;
567 memset(&key->tp, 0, sizeof(key->tp));
570 if (nh->frag_off & htons(IP_MF) ||
571 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
572 key->ip.frag = OVS_FRAG_TYPE_FIRST;
574 key->ip.frag = OVS_FRAG_TYPE_NONE;
576 /* Transport layer. */
577 if (key->ip.proto == IPPROTO_TCP) {
578 if (tcphdr_ok(skb)) {
579 struct tcphdr *tcp = tcp_hdr(skb);
580 key->tp.src = tcp->source;
581 key->tp.dst = tcp->dest;
582 key->tp.flags = TCP_FLAGS_BE16(tcp);
584 memset(&key->tp, 0, sizeof(key->tp));
587 } else if (key->ip.proto == IPPROTO_UDP) {
588 if (udphdr_ok(skb)) {
589 struct udphdr *udp = udp_hdr(skb);
590 key->tp.src = udp->source;
591 key->tp.dst = udp->dest;
593 memset(&key->tp, 0, sizeof(key->tp));
595 } else if (key->ip.proto == IPPROTO_SCTP) {
596 if (sctphdr_ok(skb)) {
597 struct sctphdr *sctp = sctp_hdr(skb);
598 key->tp.src = sctp->source;
599 key->tp.dst = sctp->dest;
601 memset(&key->tp, 0, sizeof(key->tp));
603 } else if (key->ip.proto == IPPROTO_ICMP) {
604 if (icmphdr_ok(skb)) {
605 struct icmphdr *icmp = icmp_hdr(skb);
606 /* The ICMP type and code fields use the 16-bit
607 * transport port fields, so we need to store
608 * them in 16-bit network byte order. */
609 key->tp.src = htons(icmp->type);
610 key->tp.dst = htons(icmp->code);
612 memset(&key->tp, 0, sizeof(key->tp));
616 } else if (key->eth.type == htons(ETH_P_ARP) ||
617 key->eth.type == htons(ETH_P_RARP)) {
618 struct arp_eth_header *arp;
619 bool arp_available = arphdr_ok(skb);
621 arp = (struct arp_eth_header *)skb_network_header(skb);
624 arp->ar_hrd == htons(ARPHRD_ETHER) &&
625 arp->ar_pro == htons(ETH_P_IP) &&
626 arp->ar_hln == ETH_ALEN &&
629 /* We only match on the lower 8 bits of the opcode. */
630 if (ntohs(arp->ar_op) <= 0xff)
631 key->ip.proto = ntohs(arp->ar_op);
635 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
636 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
637 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
638 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
640 memset(&key->ip, 0, sizeof(key->ip));
641 memset(&key->ipv4, 0, sizeof(key->ipv4));
643 } else if (eth_p_mpls(key->eth.type)) {
646 memset(&key->mpls, 0, sizeof(key->mpls));
647 skb_set_inner_network_header(skb, skb->mac_len);
651 error = check_header(skb, skb->mac_len +
652 label_count * MPLS_HLEN);
656 memcpy(&lse, skb_inner_network_header(skb), MPLS_HLEN);
658 if (label_count <= MPLS_LABEL_DEPTH)
659 memcpy(&key->mpls.lse[label_count - 1], &lse,
662 skb_set_inner_network_header(skb, skb->mac_len +
663 label_count * MPLS_HLEN);
664 if (lse & htonl(MPLS_LS_S_MASK))
669 if (label_count > MPLS_LABEL_DEPTH)
670 label_count = MPLS_LABEL_DEPTH;
672 key->mpls.num_labels_mask = GENMASK(label_count - 1, 0);
673 } else if (key->eth.type == htons(ETH_P_IPV6)) {
674 int nh_len; /* IPv6 Header + Extensions */
676 nh_len = parse_ipv6hdr(skb, key);
677 if (unlikely(nh_len < 0)) {
680 memset(&key->ip, 0, sizeof(key->ip));
681 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
684 skb->transport_header = skb->network_header;
693 if (key->ip.frag == OVS_FRAG_TYPE_LATER) {
694 memset(&key->tp, 0, sizeof(key->tp));
697 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
698 key->ip.frag = OVS_FRAG_TYPE_FIRST;
700 /* Transport layer. */
701 if (key->ip.proto == NEXTHDR_TCP) {
702 if (tcphdr_ok(skb)) {
703 struct tcphdr *tcp = tcp_hdr(skb);
704 key->tp.src = tcp->source;
705 key->tp.dst = tcp->dest;
706 key->tp.flags = TCP_FLAGS_BE16(tcp);
708 memset(&key->tp, 0, sizeof(key->tp));
710 } else if (key->ip.proto == NEXTHDR_UDP) {
711 if (udphdr_ok(skb)) {
712 struct udphdr *udp = udp_hdr(skb);
713 key->tp.src = udp->source;
714 key->tp.dst = udp->dest;
716 memset(&key->tp, 0, sizeof(key->tp));
718 } else if (key->ip.proto == NEXTHDR_SCTP) {
719 if (sctphdr_ok(skb)) {
720 struct sctphdr *sctp = sctp_hdr(skb);
721 key->tp.src = sctp->source;
722 key->tp.dst = sctp->dest;
724 memset(&key->tp, 0, sizeof(key->tp));
726 } else if (key->ip.proto == NEXTHDR_ICMP) {
727 if (icmp6hdr_ok(skb)) {
728 error = parse_icmpv6(skb, key, nh_len);
732 memset(&key->tp, 0, sizeof(key->tp));
735 } else if (key->eth.type == htons(ETH_P_NSH)) {
736 error = parse_nsh(skb, key);
744 * key_extract - extracts a flow key from an Ethernet frame.
745 * @skb: sk_buff that contains the frame, with skb->data pointing to the
747 * @key: output flow key
749 * The caller must ensure that skb->len >= ETH_HLEN.
751 * Returns 0 if successful, otherwise a negative errno value.
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 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
772 /* Flags are always used as part of stats */
775 skb_reset_mac_header(skb);
779 if (ovs_key_mac_proto(key) == MAC_PROTO_NONE) {
780 if (unlikely(eth_type_vlan(skb->protocol)))
783 skb_reset_network_header(skb);
784 key->eth.type = skb->protocol;
787 ether_addr_copy(key->eth.src, eth->h_source);
788 ether_addr_copy(key->eth.dst, eth->h_dest);
790 __skb_pull(skb, 2 * ETH_ALEN);
791 /* We are going to push all headers that we pull, so no need to
792 * update skb->csum here.
795 if (unlikely(parse_vlan(skb, key)))
798 key->eth.type = parse_ethertype(skb);
799 if (unlikely(key->eth.type == htons(0)))
802 /* Multiple tagged packets need to retain TPID to satisfy
803 * skb_vlan_pop(), which will later shift the ethertype into
806 if (key->eth.cvlan.tci & htons(VLAN_CFI_MASK))
807 skb->protocol = key->eth.cvlan.tpid;
809 skb->protocol = key->eth.type;
811 skb_reset_network_header(skb);
812 __skb_push(skb, skb->data - skb_mac_header(skb));
815 skb_reset_mac_len(skb);
817 /* Fill out L3/L4 key info, if any */
818 return key_extract_l3l4(skb, key);
821 /* In the case of conntrack fragment handling it expects L3 headers,
824 int ovs_flow_key_update_l3l4(struct sk_buff *skb, struct sw_flow_key *key)
826 return key_extract_l3l4(skb, key);
829 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
833 res = key_extract(skb, key);
835 key->mac_proto &= ~SW_FLOW_KEY_INVALID;
840 static int key_extract_mac_proto(struct sk_buff *skb)
842 switch (skb->dev->type) {
844 return MAC_PROTO_ETHERNET;
846 if (skb->protocol == htons(ETH_P_TEB))
847 return MAC_PROTO_ETHERNET;
848 return MAC_PROTO_NONE;
854 int ovs_flow_key_extract(const struct ip_tunnel_info *tun_info,
855 struct sk_buff *skb, struct sw_flow_key *key)
857 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
858 struct tc_skb_ext *tc_ext;
862 /* Extract metadata from packet. */
864 key->tun_proto = ip_tunnel_info_af(tun_info);
865 memcpy(&key->tun_key, &tun_info->key, sizeof(key->tun_key));
867 if (tun_info->options_len) {
868 BUILD_BUG_ON((1 << (sizeof(tun_info->options_len) *
870 > sizeof(key->tun_opts));
872 ip_tunnel_info_opts_get(TUN_METADATA_OPTS(key, tun_info->options_len),
874 key->tun_opts_len = tun_info->options_len;
876 key->tun_opts_len = 0;
880 key->tun_opts_len = 0;
881 memset(&key->tun_key, 0, sizeof(key->tun_key));
884 key->phy.priority = skb->priority;
885 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
886 key->phy.skb_mark = skb->mark;
887 key->ovs_flow_hash = 0;
888 res = key_extract_mac_proto(skb);
891 key->mac_proto = res;
893 #if IS_ENABLED(CONFIG_NET_TC_SKB_EXT)
894 if (static_branch_unlikely(&tc_recirc_sharing_support)) {
895 tc_ext = skb_ext_find(skb, TC_SKB_EXT);
896 key->recirc_id = tc_ext ? tc_ext->chain : 0;
897 OVS_CB(skb)->mru = tc_ext ? tc_ext->mru : 0;
905 err = key_extract(skb, key);
907 ovs_ct_fill_key(skb, key); /* Must be after key_extract(). */
911 int ovs_flow_key_extract_userspace(struct net *net, const struct nlattr *attr,
913 struct sw_flow_key *key, bool log)
915 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
919 err = parse_flow_nlattrs(attr, a, &attrs, log);
923 /* Extract metadata from netlink attributes. */
924 err = ovs_nla_get_flow_metadata(net, a, attrs, key, log);
928 /* key_extract assumes that skb->protocol is set-up for
929 * layer 3 packets which is the case for other callers,
930 * in particular packets received from the network stack.
931 * Here the correct value can be set from the metadata
933 * For L2 packet key eth type would be zero. skb protocol
934 * would be set to correct value later during key-extact.
937 skb->protocol = key->eth.type;
938 err = key_extract(skb, key);
942 /* Check that we have conntrack original direction tuple metadata only
943 * for packets for which it makes sense. Otherwise the key may be
944 * corrupted due to overlapping key fields.
946 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4) &&
947 key->eth.type != htons(ETH_P_IP))
949 if (attrs & (1 << OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6) &&
950 (key->eth.type != htons(ETH_P_IPV6) ||
951 sw_flow_key_is_nd(key)))