2 * Copyright (c) 2007-2011 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
21 #include <linux/uaccess.h>
22 #include <linux/netdevice.h>
23 #include <linux/etherdevice.h>
24 #include <linux/if_ether.h>
25 #include <linux/if_vlan.h>
26 #include <net/llc_pdu.h>
27 #include <linux/kernel.h>
28 #include <linux/jhash.h>
29 #include <linux/jiffies.h>
30 #include <linux/llc.h>
31 #include <linux/module.h>
33 #include <linux/rcupdate.h>
34 #include <linux/if_arp.h>
36 #include <linux/ipv6.h>
37 #include <linux/tcp.h>
38 #include <linux/udp.h>
39 #include <linux/icmp.h>
40 #include <linux/icmpv6.h>
41 #include <linux/rculist.h>
44 #include <net/ndisc.h>
48 static struct kmem_cache *flow_cache;
50 static int check_header(struct sk_buff *skb, int len)
52 if (unlikely(skb->len < len))
54 if (unlikely(!pskb_may_pull(skb, len)))
59 static bool arphdr_ok(struct sk_buff *skb)
61 return pskb_may_pull(skb, skb_network_offset(skb) +
62 sizeof(struct arp_eth_header));
65 static int check_iphdr(struct sk_buff *skb)
67 unsigned int nh_ofs = skb_network_offset(skb);
71 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
75 ip_len = ip_hdrlen(skb);
76 if (unlikely(ip_len < sizeof(struct iphdr) ||
77 skb->len < nh_ofs + ip_len))
80 skb_set_transport_header(skb, nh_ofs + ip_len);
84 static bool tcphdr_ok(struct sk_buff *skb)
86 int th_ofs = skb_transport_offset(skb);
89 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
92 tcp_len = tcp_hdrlen(skb);
93 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
94 skb->len < th_ofs + tcp_len))
100 static bool udphdr_ok(struct sk_buff *skb)
102 return pskb_may_pull(skb, skb_transport_offset(skb) +
103 sizeof(struct udphdr));
106 static bool icmphdr_ok(struct sk_buff *skb)
108 return pskb_may_pull(skb, skb_transport_offset(skb) +
109 sizeof(struct icmphdr));
112 u64 ovs_flow_used_time(unsigned long flow_jiffies)
114 struct timespec cur_ts;
117 ktime_get_ts(&cur_ts);
118 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
119 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
120 cur_ts.tv_nsec / NSEC_PER_MSEC;
122 return cur_ms - idle_ms;
125 #define SW_FLOW_KEY_OFFSET(field) \
126 (offsetof(struct sw_flow_key, field) + \
127 FIELD_SIZEOF(struct sw_flow_key, field))
129 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key,
132 unsigned int nh_ofs = skb_network_offset(skb);
140 *key_lenp = SW_FLOW_KEY_OFFSET(ipv6.label);
142 err = check_header(skb, nh_ofs + sizeof(*nh));
147 nexthdr = nh->nexthdr;
148 payload_ofs = (u8 *)(nh + 1) - skb->data;
150 key->ip.proto = NEXTHDR_NONE;
151 key->ip.tos = ipv6_get_dsfield(nh);
152 key->ip.ttl = nh->hop_limit;
153 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
154 key->ipv6.addr.src = nh->saddr;
155 key->ipv6.addr.dst = nh->daddr;
157 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
158 if (unlikely(payload_ofs < 0))
162 if (frag_off & htons(~0x7))
163 key->ip.frag = OVS_FRAG_TYPE_LATER;
165 key->ip.frag = OVS_FRAG_TYPE_FIRST;
168 nh_len = payload_ofs - nh_ofs;
169 skb_set_transport_header(skb, nh_ofs + nh_len);
170 key->ip.proto = nexthdr;
174 static bool icmp6hdr_ok(struct sk_buff *skb)
176 return pskb_may_pull(skb, skb_transport_offset(skb) +
177 sizeof(struct icmp6hdr));
180 #define TCP_FLAGS_OFFSET 13
181 #define TCP_FLAG_MASK 0x3f
183 void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
187 if ((flow->key.eth.type == htons(ETH_P_IP) ||
188 flow->key.eth.type == htons(ETH_P_IPV6)) &&
189 flow->key.ip.proto == IPPROTO_TCP &&
190 likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
191 u8 *tcp = (u8 *)tcp_hdr(skb);
192 tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
195 spin_lock(&flow->lock);
196 flow->used = jiffies;
197 flow->packet_count++;
198 flow->byte_count += skb->len;
199 flow->tcp_flags |= tcp_flags;
200 spin_unlock(&flow->lock);
203 struct sw_flow_actions *ovs_flow_actions_alloc(const struct nlattr *actions)
205 int actions_len = nla_len(actions);
206 struct sw_flow_actions *sfa;
208 if (actions_len > MAX_ACTIONS_BUFSIZE)
209 return ERR_PTR(-EINVAL);
211 sfa = kmalloc(sizeof(*sfa) + actions_len, GFP_KERNEL);
213 return ERR_PTR(-ENOMEM);
215 sfa->actions_len = actions_len;
216 memcpy(sfa->actions, nla_data(actions), actions_len);
220 struct sw_flow *ovs_flow_alloc(void)
222 struct sw_flow *flow;
224 flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
226 return ERR_PTR(-ENOMEM);
228 spin_lock_init(&flow->lock);
229 atomic_set(&flow->refcnt, 1);
230 flow->sf_acts = NULL;
236 static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
238 hash = jhash_1word(hash, table->hash_seed);
239 return flex_array_get(table->buckets,
240 (hash & (table->n_buckets - 1)));
243 static struct flex_array *alloc_buckets(unsigned int n_buckets)
245 struct flex_array *buckets;
248 buckets = flex_array_alloc(sizeof(struct hlist_head *),
249 n_buckets, GFP_KERNEL);
253 err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
255 flex_array_free(buckets);
259 for (i = 0; i < n_buckets; i++)
260 INIT_HLIST_HEAD((struct hlist_head *)
261 flex_array_get(buckets, i));
266 static void free_buckets(struct flex_array *buckets)
268 flex_array_free(buckets);
271 struct flow_table *ovs_flow_tbl_alloc(int new_size)
273 struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
278 table->buckets = alloc_buckets(new_size);
280 if (!table->buckets) {
284 table->n_buckets = new_size;
287 table->keep_flows = false;
288 get_random_bytes(&table->hash_seed, sizeof(u32));
293 static void flow_free(struct sw_flow *flow)
299 void ovs_flow_tbl_destroy(struct flow_table *table)
306 if (table->keep_flows)
309 for (i = 0; i < table->n_buckets; i++) {
310 struct sw_flow *flow;
311 struct hlist_head *head = flex_array_get(table->buckets, i);
312 struct hlist_node *node, *n;
313 int ver = table->node_ver;
315 hlist_for_each_entry_safe(flow, node, n, head, hash_node[ver]) {
316 hlist_del_rcu(&flow->hash_node[ver]);
322 free_buckets(table->buckets);
326 static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
328 struct flow_table *table = container_of(rcu, struct flow_table, rcu);
330 ovs_flow_tbl_destroy(table);
333 void ovs_flow_tbl_deferred_destroy(struct flow_table *table)
338 call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
341 struct sw_flow *ovs_flow_tbl_next(struct flow_table *table, u32 *bucket, u32 *last)
343 struct sw_flow *flow;
344 struct hlist_head *head;
345 struct hlist_node *n;
349 ver = table->node_ver;
350 while (*bucket < table->n_buckets) {
352 head = flex_array_get(table->buckets, *bucket);
353 hlist_for_each_entry_rcu(flow, n, head, hash_node[ver]) {
368 static void __flow_tbl_insert(struct flow_table *table, struct sw_flow *flow)
370 struct hlist_head *head;
371 head = find_bucket(table, flow->hash);
372 hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
376 static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
381 old_ver = old->node_ver;
382 new->node_ver = !old_ver;
384 /* Insert in new table. */
385 for (i = 0; i < old->n_buckets; i++) {
386 struct sw_flow *flow;
387 struct hlist_head *head;
388 struct hlist_node *n;
390 head = flex_array_get(old->buckets, i);
392 hlist_for_each_entry(flow, n, head, hash_node[old_ver])
393 __flow_tbl_insert(new, flow);
395 old->keep_flows = true;
398 static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
400 struct flow_table *new_table;
402 new_table = ovs_flow_tbl_alloc(n_buckets);
404 return ERR_PTR(-ENOMEM);
406 flow_table_copy_flows(table, new_table);
411 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
413 return __flow_tbl_rehash(table, table->n_buckets);
416 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
418 return __flow_tbl_rehash(table, table->n_buckets * 2);
421 /* RCU callback used by ovs_flow_deferred_free. */
422 static void rcu_free_flow_callback(struct rcu_head *rcu)
424 struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
430 /* Schedules 'flow' to be freed after the next RCU grace period.
431 * The caller must hold rcu_read_lock for this to be sensible. */
432 void ovs_flow_deferred_free(struct sw_flow *flow)
434 call_rcu(&flow->rcu, rcu_free_flow_callback);
437 void ovs_flow_hold(struct sw_flow *flow)
439 atomic_inc(&flow->refcnt);
442 void ovs_flow_put(struct sw_flow *flow)
447 if (atomic_dec_and_test(&flow->refcnt)) {
448 kfree((struct sf_flow_acts __force *)flow->sf_acts);
449 kmem_cache_free(flow_cache, flow);
453 /* RCU callback used by ovs_flow_deferred_free_acts. */
454 static void rcu_free_acts_callback(struct rcu_head *rcu)
456 struct sw_flow_actions *sf_acts = container_of(rcu,
457 struct sw_flow_actions, rcu);
461 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
462 * The caller must hold rcu_read_lock for this to be sensible. */
463 void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
465 call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
468 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
471 __be16 eth_type; /* ETH_P_8021Q */
474 struct qtag_prefix *qp;
476 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
479 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
483 qp = (struct qtag_prefix *) skb->data;
484 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
485 __skb_pull(skb, sizeof(struct qtag_prefix));
490 static __be16 parse_ethertype(struct sk_buff *skb)
492 struct llc_snap_hdr {
493 u8 dsap; /* Always 0xAA */
494 u8 ssap; /* Always 0xAA */
499 struct llc_snap_hdr *llc;
502 proto = *(__be16 *) skb->data;
503 __skb_pull(skb, sizeof(__be16));
505 if (ntohs(proto) >= 1536)
508 if (skb->len < sizeof(struct llc_snap_hdr))
509 return htons(ETH_P_802_2);
511 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
514 llc = (struct llc_snap_hdr *) skb->data;
515 if (llc->dsap != LLC_SAP_SNAP ||
516 llc->ssap != LLC_SAP_SNAP ||
517 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
518 return htons(ETH_P_802_2);
520 __skb_pull(skb, sizeof(struct llc_snap_hdr));
521 return llc->ethertype;
524 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
525 int *key_lenp, int nh_len)
527 struct icmp6hdr *icmp = icmp6_hdr(skb);
531 /* The ICMPv6 type and code fields use the 16-bit transport port
532 * fields, so we need to store them in 16-bit network byte order.
534 key->ipv6.tp.src = htons(icmp->icmp6_type);
535 key->ipv6.tp.dst = htons(icmp->icmp6_code);
536 key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
538 if (icmp->icmp6_code == 0 &&
539 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
540 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
541 int icmp_len = skb->len - skb_transport_offset(skb);
545 key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
547 /* In order to process neighbor discovery options, we need the
550 if (unlikely(icmp_len < sizeof(*nd)))
552 if (unlikely(skb_linearize(skb))) {
557 nd = (struct nd_msg *)skb_transport_header(skb);
558 key->ipv6.nd.target = nd->target;
559 key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
561 icmp_len -= sizeof(*nd);
563 while (icmp_len >= 8) {
564 struct nd_opt_hdr *nd_opt =
565 (struct nd_opt_hdr *)(nd->opt + offset);
566 int opt_len = nd_opt->nd_opt_len * 8;
568 if (unlikely(!opt_len || opt_len > icmp_len))
571 /* Store the link layer address if the appropriate
572 * option is provided. It is considered an error if
573 * the same link layer option is specified twice.
575 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
577 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
579 memcpy(key->ipv6.nd.sll,
580 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
581 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
583 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
585 memcpy(key->ipv6.nd.tll,
586 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
597 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
598 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
599 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
607 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
608 * @skb: sk_buff that contains the frame, with skb->data pointing to the
610 * @in_port: port number on which @skb was received.
611 * @key: output flow key
612 * @key_lenp: length of output flow key
614 * The caller must ensure that skb->len >= ETH_HLEN.
616 * Returns 0 if successful, otherwise a negative errno value.
618 * Initializes @skb header pointers as follows:
620 * - skb->mac_header: the Ethernet header.
622 * - skb->network_header: just past the Ethernet header, or just past the
623 * VLAN header, to the first byte of the Ethernet payload.
625 * - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
626 * on output, then just past the IP header, if one is present and
627 * of a correct length, otherwise the same as skb->network_header.
628 * For other key->dl_type values it is left untouched.
630 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key,
634 int key_len = SW_FLOW_KEY_OFFSET(eth);
637 memset(key, 0, sizeof(*key));
639 key->phy.priority = skb->priority;
640 if (OVS_CB(skb)->tun_key)
641 memcpy(&key->phy.tun.tun_key, OVS_CB(skb)->tun_key, sizeof(key->phy.tun.tun_key));
642 key->phy.in_port = in_port;
644 skb_reset_mac_header(skb);
646 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
647 * header in the linear data area.
650 memcpy(key->eth.src, eth->h_source, ETH_ALEN);
651 memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
653 __skb_pull(skb, 2 * ETH_ALEN);
655 if (vlan_tx_tag_present(skb))
656 key->eth.tci = htons(vlan_get_tci(skb));
657 else if (eth->h_proto == htons(ETH_P_8021Q))
658 if (unlikely(parse_vlan(skb, key)))
661 key->eth.type = parse_ethertype(skb);
662 if (unlikely(key->eth.type == htons(0)))
665 skb_reset_network_header(skb);
666 __skb_push(skb, skb->data - skb_mac_header(skb));
669 if (key->eth.type == htons(ETH_P_IP)) {
673 key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
675 error = check_iphdr(skb);
676 if (unlikely(error)) {
677 if (error == -EINVAL) {
678 skb->transport_header = skb->network_header;
685 key->ipv4.addr.src = nh->saddr;
686 key->ipv4.addr.dst = nh->daddr;
688 key->ip.proto = nh->protocol;
689 key->ip.tos = nh->tos;
690 key->ip.ttl = nh->ttl;
692 offset = nh->frag_off & htons(IP_OFFSET);
694 key->ip.frag = OVS_FRAG_TYPE_LATER;
697 if (nh->frag_off & htons(IP_MF) ||
698 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
699 key->ip.frag = OVS_FRAG_TYPE_FIRST;
701 /* Transport layer. */
702 if (key->ip.proto == IPPROTO_TCP) {
703 key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
704 if (tcphdr_ok(skb)) {
705 struct tcphdr *tcp = tcp_hdr(skb);
706 key->ipv4.tp.src = tcp->source;
707 key->ipv4.tp.dst = tcp->dest;
709 } else if (key->ip.proto == IPPROTO_UDP) {
710 key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
711 if (udphdr_ok(skb)) {
712 struct udphdr *udp = udp_hdr(skb);
713 key->ipv4.tp.src = udp->source;
714 key->ipv4.tp.dst = udp->dest;
716 } else if (key->ip.proto == IPPROTO_ICMP) {
717 key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
718 if (icmphdr_ok(skb)) {
719 struct icmphdr *icmp = icmp_hdr(skb);
720 /* The ICMP type and code fields use the 16-bit
721 * transport port fields, so we need to store
722 * them in 16-bit network byte order. */
723 key->ipv4.tp.src = htons(icmp->type);
724 key->ipv4.tp.dst = htons(icmp->code);
728 } else if (key->eth.type == htons(ETH_P_ARP) && arphdr_ok(skb)) {
729 struct arp_eth_header *arp;
731 arp = (struct arp_eth_header *)skb_network_header(skb);
733 if (arp->ar_hrd == htons(ARPHRD_ETHER)
734 && arp->ar_pro == htons(ETH_P_IP)
735 && arp->ar_hln == ETH_ALEN
736 && arp->ar_pln == 4) {
738 /* We only match on the lower 8 bits of the opcode. */
739 if (ntohs(arp->ar_op) <= 0xff)
740 key->ip.proto = ntohs(arp->ar_op);
742 if (key->ip.proto == ARPOP_REQUEST
743 || key->ip.proto == ARPOP_REPLY) {
744 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
745 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
746 memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
747 memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
748 key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
751 } else if (key->eth.type == htons(ETH_P_IPV6)) {
752 int nh_len; /* IPv6 Header + Extensions */
754 nh_len = parse_ipv6hdr(skb, key, &key_len);
755 if (unlikely(nh_len < 0)) {
756 if (nh_len == -EINVAL)
757 skb->transport_header = skb->network_header;
763 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
765 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
766 key->ip.frag = OVS_FRAG_TYPE_FIRST;
768 /* Transport layer. */
769 if (key->ip.proto == NEXTHDR_TCP) {
770 key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
771 if (tcphdr_ok(skb)) {
772 struct tcphdr *tcp = tcp_hdr(skb);
773 key->ipv6.tp.src = tcp->source;
774 key->ipv6.tp.dst = tcp->dest;
776 } else if (key->ip.proto == NEXTHDR_UDP) {
777 key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
778 if (udphdr_ok(skb)) {
779 struct udphdr *udp = udp_hdr(skb);
780 key->ipv6.tp.src = udp->source;
781 key->ipv6.tp.dst = udp->dest;
783 } else if (key->ip.proto == NEXTHDR_ICMP) {
784 key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
785 if (icmp6hdr_ok(skb)) {
786 error = parse_icmpv6(skb, key, &key_len, nh_len);
798 static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len)
800 return jhash2((u32 *)((u8 *)key + key_start),
801 DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0);
804 static int flow_key_start(struct sw_flow_key *key)
806 if (key->phy.tun.tun_key.ipv4_dst)
809 return offsetof(struct sw_flow_key, phy.priority);
812 struct sw_flow *ovs_flow_tbl_lookup(struct flow_table *table,
813 struct sw_flow_key *key, int key_len)
815 struct sw_flow *flow;
816 struct hlist_node *n;
817 struct hlist_head *head;
822 key_start = flow_key_start(key);
823 hash = ovs_flow_hash(key, key_start, key_len);
825 _key = (u8 *) key + key_start;
826 head = find_bucket(table, hash);
827 hlist_for_each_entry_rcu(flow, n, head, hash_node[table->node_ver]) {
829 if (flow->hash == hash &&
830 !memcmp((u8 *)&flow->key + key_start, _key, key_len - key_start)) {
837 void ovs_flow_tbl_insert(struct flow_table *table, struct sw_flow *flow,
838 struct sw_flow_key *key, int key_len)
840 flow->hash = ovs_flow_hash(key, flow_key_start(key), key_len);
841 memcpy(&flow->key, key, sizeof(flow->key));
842 __flow_tbl_insert(table, flow);
845 void ovs_flow_tbl_remove(struct flow_table *table, struct sw_flow *flow)
847 hlist_del_rcu(&flow->hash_node[table->node_ver]);
849 BUG_ON(table->count < 0);
852 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
853 const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
854 [OVS_KEY_ATTR_ENCAP] = -1,
855 [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
856 [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
857 [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
858 [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
859 [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
860 [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
861 [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
862 [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
863 [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
864 [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
865 [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
866 [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
867 [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
870 [OVS_KEY_ATTR_TUN_ID] = sizeof(__be64),
871 [OVS_KEY_ATTR_IPV4_TUNNEL] = sizeof(struct ovs_key_ipv4_tunnel),
874 static int ipv4_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
875 const struct nlattr *a[], u64 *attrs)
877 const struct ovs_key_icmp *icmp_key;
878 const struct ovs_key_tcp *tcp_key;
879 const struct ovs_key_udp *udp_key;
881 switch (swkey->ip.proto) {
883 if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
885 *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
887 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
888 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
889 swkey->ipv4.tp.src = tcp_key->tcp_src;
890 swkey->ipv4.tp.dst = tcp_key->tcp_dst;
894 if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
896 *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
898 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
899 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
900 swkey->ipv4.tp.src = udp_key->udp_src;
901 swkey->ipv4.tp.dst = udp_key->udp_dst;
905 if (!(*attrs & (1 << OVS_KEY_ATTR_ICMP)))
907 *attrs &= ~(1 << OVS_KEY_ATTR_ICMP);
909 *key_len = SW_FLOW_KEY_OFFSET(ipv4.tp);
910 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
911 swkey->ipv4.tp.src = htons(icmp_key->icmp_type);
912 swkey->ipv4.tp.dst = htons(icmp_key->icmp_code);
919 static int ipv6_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_len,
920 const struct nlattr *a[], u64 *attrs)
922 const struct ovs_key_icmpv6 *icmpv6_key;
923 const struct ovs_key_tcp *tcp_key;
924 const struct ovs_key_udp *udp_key;
926 switch (swkey->ip.proto) {
928 if (!(*attrs & (1 << OVS_KEY_ATTR_TCP)))
930 *attrs &= ~(1 << OVS_KEY_ATTR_TCP);
932 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
933 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
934 swkey->ipv6.tp.src = tcp_key->tcp_src;
935 swkey->ipv6.tp.dst = tcp_key->tcp_dst;
939 if (!(*attrs & (1 << OVS_KEY_ATTR_UDP)))
941 *attrs &= ~(1 << OVS_KEY_ATTR_UDP);
943 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
944 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
945 swkey->ipv6.tp.src = udp_key->udp_src;
946 swkey->ipv6.tp.dst = udp_key->udp_dst;
950 if (!(*attrs & (1 << OVS_KEY_ATTR_ICMPV6)))
952 *attrs &= ~(1 << OVS_KEY_ATTR_ICMPV6);
954 *key_len = SW_FLOW_KEY_OFFSET(ipv6.tp);
955 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
956 swkey->ipv6.tp.src = htons(icmpv6_key->icmpv6_type);
957 swkey->ipv6.tp.dst = htons(icmpv6_key->icmpv6_code);
959 if (swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_SOLICITATION) ||
960 swkey->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
961 const struct ovs_key_nd *nd_key;
963 if (!(*attrs & (1 << OVS_KEY_ATTR_ND)))
965 *attrs &= ~(1 << OVS_KEY_ATTR_ND);
967 *key_len = SW_FLOW_KEY_OFFSET(ipv6.nd);
968 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
969 memcpy(&swkey->ipv6.nd.target, nd_key->nd_target,
970 sizeof(swkey->ipv6.nd.target));
971 memcpy(swkey->ipv6.nd.sll, nd_key->nd_sll, ETH_ALEN);
972 memcpy(swkey->ipv6.nd.tll, nd_key->nd_tll, ETH_ALEN);
980 static int parse_flow_nlattrs(const struct nlattr *attr,
981 const struct nlattr *a[], u64 *attrsp)
983 const struct nlattr *nla;
988 nla_for_each_nested(nla, attr, rem) {
989 u16 type = nla_type(nla);
992 if (type > OVS_KEY_ATTR_MAX || attrs & (1ULL << type))
995 expected_len = ovs_key_lens[type];
996 if (nla_len(nla) != expected_len && expected_len != -1)
999 attrs |= 1ULL << type;
1010 * ovs_flow_from_nlattrs - parses Netlink attributes into a flow key.
1011 * @swkey: receives the extracted flow key.
1012 * @key_lenp: number of bytes used in @swkey.
1013 * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1016 int ovs_flow_from_nlattrs(struct sw_flow_key *swkey, int *key_lenp,
1017 const struct nlattr *attr)
1019 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1020 const struct ovs_key_ethernet *eth_key;
1025 memset(swkey, 0, sizeof(struct sw_flow_key));
1026 key_len = SW_FLOW_KEY_OFFSET(eth);
1028 err = parse_flow_nlattrs(attr, a, &attrs);
1032 /* Metadata attributes. */
1033 if (attrs & (1 << OVS_KEY_ATTR_PRIORITY)) {
1034 swkey->phy.priority = nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]);
1035 attrs &= ~(1 << OVS_KEY_ATTR_PRIORITY);
1037 if (attrs & (1 << OVS_KEY_ATTR_IN_PORT)) {
1038 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1039 if (in_port >= DP_MAX_PORTS)
1041 swkey->phy.in_port = in_port;
1042 attrs &= ~(1 << OVS_KEY_ATTR_IN_PORT);
1044 swkey->phy.in_port = DP_MAX_PORTS;
1047 if (attrs & (1ULL << OVS_KEY_ATTR_TUN_ID) &&
1048 attrs & (1ULL << OVS_KEY_ATTR_IPV4_TUNNEL)) {
1049 struct ovs_key_ipv4_tunnel *tun_key;
1052 tun_key = nla_data(a[OVS_KEY_ATTR_IPV4_TUNNEL]);
1054 if (!tun_key->ipv4_dst)
1056 if (!(tun_key->tun_flags & OVS_FLOW_TNL_F_KEY))
1059 tun_id = nla_get_be64(a[OVS_KEY_ATTR_TUN_ID]);
1060 if (tun_id != tun_key->tun_id)
1063 memcpy(&swkey->phy.tun.tun_key, tun_key, sizeof(swkey->phy.tun.tun_key));
1064 attrs &= ~(1ULL << OVS_KEY_ATTR_TUN_ID);
1065 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4_TUNNEL);
1066 } else if (attrs & (1ULL << OVS_KEY_ATTR_TUN_ID)) {
1067 swkey->phy.tun.tun_key.tun_id = nla_get_be64(a[OVS_KEY_ATTR_TUN_ID]);
1068 swkey->phy.tun.tun_key.tun_flags |= OVS_FLOW_TNL_F_KEY;
1070 attrs &= ~(1ULL << OVS_KEY_ATTR_TUN_ID);
1071 } else if (attrs & (1ULL << OVS_KEY_ATTR_IPV4_TUNNEL)) {
1072 struct ovs_key_ipv4_tunnel *tun_key;
1073 tun_key = nla_data(a[OVS_KEY_ATTR_IPV4_TUNNEL]);
1075 if (!tun_key->ipv4_dst)
1078 memcpy(&swkey->phy.tun.tun_key, tun_key, sizeof(swkey->phy.tun.tun_key));
1079 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4_TUNNEL);
1082 /* Data attributes. */
1083 if (!(attrs & (1 << OVS_KEY_ATTR_ETHERNET)))
1085 attrs &= ~(1 << OVS_KEY_ATTR_ETHERNET);
1087 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1088 memcpy(swkey->eth.src, eth_key->eth_src, ETH_ALEN);
1089 memcpy(swkey->eth.dst, eth_key->eth_dst, ETH_ALEN);
1091 if (attrs & (1u << OVS_KEY_ATTR_ETHERTYPE) &&
1092 nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]) == htons(ETH_P_8021Q)) {
1093 const struct nlattr *encap;
1096 if (attrs != ((1 << OVS_KEY_ATTR_VLAN) |
1097 (1 << OVS_KEY_ATTR_ETHERTYPE) |
1098 (1 << OVS_KEY_ATTR_ENCAP)))
1101 encap = a[OVS_KEY_ATTR_ENCAP];
1102 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1103 if (tci & htons(VLAN_TAG_PRESENT)) {
1104 swkey->eth.tci = tci;
1106 err = parse_flow_nlattrs(encap, a, &attrs);
1110 /* Corner case for truncated 802.1Q header. */
1114 swkey->eth.type = htons(ETH_P_8021Q);
1115 *key_lenp = key_len;
1122 if (attrs & (1 << OVS_KEY_ATTR_ETHERTYPE)) {
1123 swkey->eth.type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1124 if (ntohs(swkey->eth.type) < 1536)
1126 attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE);
1128 swkey->eth.type = htons(ETH_P_802_2);
1131 if (swkey->eth.type == htons(ETH_P_IP)) {
1132 const struct ovs_key_ipv4 *ipv4_key;
1134 if (!(attrs & (1 << OVS_KEY_ATTR_IPV4)))
1136 attrs &= ~(1 << OVS_KEY_ATTR_IPV4);
1138 key_len = SW_FLOW_KEY_OFFSET(ipv4.addr);
1139 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1140 if (ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX)
1142 swkey->ip.proto = ipv4_key->ipv4_proto;
1143 swkey->ip.tos = ipv4_key->ipv4_tos;
1144 swkey->ip.ttl = ipv4_key->ipv4_ttl;
1145 swkey->ip.frag = ipv4_key->ipv4_frag;
1146 swkey->ipv4.addr.src = ipv4_key->ipv4_src;
1147 swkey->ipv4.addr.dst = ipv4_key->ipv4_dst;
1149 if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1150 err = ipv4_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1154 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1155 const struct ovs_key_ipv6 *ipv6_key;
1157 if (!(attrs & (1 << OVS_KEY_ATTR_IPV6)))
1159 attrs &= ~(1 << OVS_KEY_ATTR_IPV6);
1161 key_len = SW_FLOW_KEY_OFFSET(ipv6.label);
1162 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1163 if (ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX)
1165 swkey->ipv6.label = ipv6_key->ipv6_label;
1166 swkey->ip.proto = ipv6_key->ipv6_proto;
1167 swkey->ip.tos = ipv6_key->ipv6_tclass;
1168 swkey->ip.ttl = ipv6_key->ipv6_hlimit;
1169 swkey->ip.frag = ipv6_key->ipv6_frag;
1170 memcpy(&swkey->ipv6.addr.src, ipv6_key->ipv6_src,
1171 sizeof(swkey->ipv6.addr.src));
1172 memcpy(&swkey->ipv6.addr.dst, ipv6_key->ipv6_dst,
1173 sizeof(swkey->ipv6.addr.dst));
1175 if (swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1176 err = ipv6_flow_from_nlattrs(swkey, &key_len, a, &attrs);
1180 } else if (swkey->eth.type == htons(ETH_P_ARP)) {
1181 const struct ovs_key_arp *arp_key;
1183 if (!(attrs & (1 << OVS_KEY_ATTR_ARP)))
1185 attrs &= ~(1 << OVS_KEY_ATTR_ARP);
1187 key_len = SW_FLOW_KEY_OFFSET(ipv4.arp);
1188 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1189 swkey->ipv4.addr.src = arp_key->arp_sip;
1190 swkey->ipv4.addr.dst = arp_key->arp_tip;
1191 if (arp_key->arp_op & htons(0xff00))
1193 swkey->ip.proto = ntohs(arp_key->arp_op);
1194 memcpy(swkey->ipv4.arp.sha, arp_key->arp_sha, ETH_ALEN);
1195 memcpy(swkey->ipv4.arp.tha, arp_key->arp_tha, ETH_ALEN);
1200 *key_lenp = key_len;
1206 * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
1207 * @in_port: receives the extracted input port.
1208 * @tun_id: receives the extracted tunnel ID.
1209 * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1212 * This parses a series of Netlink attributes that form a flow key, which must
1213 * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1214 * get the metadata, that is, the parts of the flow key that cannot be
1215 * extracted from the packet itself.
1218 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow, int key_len, const struct nlattr *attr)
1220 struct ovs_key_ipv4_tunnel *tun_key = &flow->key.phy.tun.tun_key;
1221 const struct nlattr *nla;
1225 flow->key.phy.in_port = DP_MAX_PORTS;
1226 flow->key.phy.priority = 0;
1227 memset(tun_key, 0, sizeof(flow->key.phy.tun.tun_key));
1229 nla_for_each_nested(nla, attr, rem) {
1230 int type = nla_type(nla);
1232 if (type <= OVS_KEY_ATTR_MAX && ovs_key_lens[type] > 0) {
1233 if (nla_len(nla) != ovs_key_lens[type])
1237 case OVS_KEY_ATTR_PRIORITY:
1238 flow->key.phy.priority = nla_get_u32(nla);
1241 case OVS_KEY_ATTR_TUN_ID:
1242 tun_id = nla_get_be64(nla);
1244 if (tun_key->ipv4_dst) {
1245 if (!(tun_key->tun_flags & OVS_FLOW_TNL_F_KEY))
1247 if (tun_key->tun_id != tun_id)
1251 tun_key->tun_id = tun_id;
1252 tun_key->tun_flags |= OVS_FLOW_TNL_F_KEY;
1256 case OVS_KEY_ATTR_IPV4_TUNNEL:
1257 if (tun_key->tun_flags & OVS_FLOW_TNL_F_KEY) {
1258 tun_id = tun_key->tun_id;
1260 memcpy(tun_key, nla_data(nla), sizeof(*tun_key));
1261 if (!(tun_key->tun_flags & OVS_FLOW_TNL_F_KEY))
1264 if (tun_key->tun_id != tun_id)
1267 memcpy(tun_key, nla_data(nla), sizeof(*tun_key));
1269 if (!tun_key->ipv4_dst)
1273 case OVS_KEY_ATTR_IN_PORT:
1274 if (nla_get_u32(nla) >= DP_MAX_PORTS)
1276 flow->key.phy.in_port = nla_get_u32(nla);
1284 flow->hash = ovs_flow_hash(&flow->key,
1285 flow_key_start(&flow->key), key_len);
1290 int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey, struct sk_buff *skb)
1292 struct ovs_key_ethernet *eth_key;
1293 struct nlattr *nla, *encap;
1295 if (swkey->phy.priority &&
1296 nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, swkey->phy.priority))
1297 goto nla_put_failure;
1299 if (swkey->phy.tun.tun_key.ipv4_dst) {
1300 struct ovs_key_ipv4_tunnel *tun_key;
1301 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4_TUNNEL, sizeof(*tun_key));
1303 goto nla_put_failure;
1304 tun_key = nla_data(nla);
1305 memcpy(tun_key, &swkey->phy.tun.tun_key, sizeof(*tun_key));
1307 if ((swkey->phy.tun.tun_key.tun_flags & OVS_FLOW_TNL_F_KEY) &&
1308 nla_put_be64(skb, OVS_KEY_ATTR_TUN_ID, swkey->phy.tun.tun_key.tun_id))
1309 goto nla_put_failure;
1311 if (swkey->phy.in_port != DP_MAX_PORTS &&
1312 nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT, swkey->phy.in_port))
1313 goto nla_put_failure;
1315 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1317 goto nla_put_failure;
1318 eth_key = nla_data(nla);
1319 memcpy(eth_key->eth_src, swkey->eth.src, ETH_ALEN);
1320 memcpy(eth_key->eth_dst, swkey->eth.dst, ETH_ALEN);
1322 if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1323 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, htons(ETH_P_8021Q)) ||
1324 nla_put_be16(skb, OVS_KEY_ATTR_VLAN, swkey->eth.tci))
1325 goto nla_put_failure;
1326 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1327 if (!swkey->eth.tci)
1333 if (swkey->eth.type == htons(ETH_P_802_2))
1336 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, swkey->eth.type))
1337 goto nla_put_failure;
1339 if (swkey->eth.type == htons(ETH_P_IP)) {
1340 struct ovs_key_ipv4 *ipv4_key;
1342 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1344 goto nla_put_failure;
1345 ipv4_key = nla_data(nla);
1346 ipv4_key->ipv4_src = swkey->ipv4.addr.src;
1347 ipv4_key->ipv4_dst = swkey->ipv4.addr.dst;
1348 ipv4_key->ipv4_proto = swkey->ip.proto;
1349 ipv4_key->ipv4_tos = swkey->ip.tos;
1350 ipv4_key->ipv4_ttl = swkey->ip.ttl;
1351 ipv4_key->ipv4_frag = swkey->ip.frag;
1352 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1353 struct ovs_key_ipv6 *ipv6_key;
1355 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1357 goto nla_put_failure;
1358 ipv6_key = nla_data(nla);
1359 memcpy(ipv6_key->ipv6_src, &swkey->ipv6.addr.src,
1360 sizeof(ipv6_key->ipv6_src));
1361 memcpy(ipv6_key->ipv6_dst, &swkey->ipv6.addr.dst,
1362 sizeof(ipv6_key->ipv6_dst));
1363 ipv6_key->ipv6_label = swkey->ipv6.label;
1364 ipv6_key->ipv6_proto = swkey->ip.proto;
1365 ipv6_key->ipv6_tclass = swkey->ip.tos;
1366 ipv6_key->ipv6_hlimit = swkey->ip.ttl;
1367 ipv6_key->ipv6_frag = swkey->ip.frag;
1368 } else if (swkey->eth.type == htons(ETH_P_ARP)) {
1369 struct ovs_key_arp *arp_key;
1371 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1373 goto nla_put_failure;
1374 arp_key = nla_data(nla);
1375 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1376 arp_key->arp_sip = swkey->ipv4.addr.src;
1377 arp_key->arp_tip = swkey->ipv4.addr.dst;
1378 arp_key->arp_op = htons(swkey->ip.proto);
1379 memcpy(arp_key->arp_sha, swkey->ipv4.arp.sha, ETH_ALEN);
1380 memcpy(arp_key->arp_tha, swkey->ipv4.arp.tha, ETH_ALEN);
1383 if ((swkey->eth.type == htons(ETH_P_IP) ||
1384 swkey->eth.type == htons(ETH_P_IPV6)) &&
1385 swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1387 if (swkey->ip.proto == IPPROTO_TCP) {
1388 struct ovs_key_tcp *tcp_key;
1390 nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1392 goto nla_put_failure;
1393 tcp_key = nla_data(nla);
1394 if (swkey->eth.type == htons(ETH_P_IP)) {
1395 tcp_key->tcp_src = swkey->ipv4.tp.src;
1396 tcp_key->tcp_dst = swkey->ipv4.tp.dst;
1397 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1398 tcp_key->tcp_src = swkey->ipv6.tp.src;
1399 tcp_key->tcp_dst = swkey->ipv6.tp.dst;
1401 } else if (swkey->ip.proto == IPPROTO_UDP) {
1402 struct ovs_key_udp *udp_key;
1404 nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1406 goto nla_put_failure;
1407 udp_key = nla_data(nla);
1408 if (swkey->eth.type == htons(ETH_P_IP)) {
1409 udp_key->udp_src = swkey->ipv4.tp.src;
1410 udp_key->udp_dst = swkey->ipv4.tp.dst;
1411 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1412 udp_key->udp_src = swkey->ipv6.tp.src;
1413 udp_key->udp_dst = swkey->ipv6.tp.dst;
1415 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1416 swkey->ip.proto == IPPROTO_ICMP) {
1417 struct ovs_key_icmp *icmp_key;
1419 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1421 goto nla_put_failure;
1422 icmp_key = nla_data(nla);
1423 icmp_key->icmp_type = ntohs(swkey->ipv4.tp.src);
1424 icmp_key->icmp_code = ntohs(swkey->ipv4.tp.dst);
1425 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1426 swkey->ip.proto == IPPROTO_ICMPV6) {
1427 struct ovs_key_icmpv6 *icmpv6_key;
1429 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1430 sizeof(*icmpv6_key));
1432 goto nla_put_failure;
1433 icmpv6_key = nla_data(nla);
1434 icmpv6_key->icmpv6_type = ntohs(swkey->ipv6.tp.src);
1435 icmpv6_key->icmpv6_code = ntohs(swkey->ipv6.tp.dst);
1437 if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1438 icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1439 struct ovs_key_nd *nd_key;
1441 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1443 goto nla_put_failure;
1444 nd_key = nla_data(nla);
1445 memcpy(nd_key->nd_target, &swkey->ipv6.nd.target,
1446 sizeof(nd_key->nd_target));
1447 memcpy(nd_key->nd_sll, swkey->ipv6.nd.sll, ETH_ALEN);
1448 memcpy(nd_key->nd_tll, swkey->ipv6.nd.tll, ETH_ALEN);
1455 nla_nest_end(skb, encap);
1463 /* Initializes the flow module.
1464 * Returns zero if successful or a negative error code. */
1465 int ovs_flow_init(void)
1467 flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
1469 if (flow_cache == NULL)
1475 /* Uninitializes the flow module. */
1476 void ovs_flow_exit(void)
1478 kmem_cache_destroy(flow_cache);