2 * Copyright (c) 2007-2013 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 void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
51 struct sw_flow_key_range *range, u8 val);
53 static void update_range__(struct sw_flow_match *match,
54 size_t offset, size_t size, bool is_mask)
56 struct sw_flow_key_range *range = NULL;
57 size_t start = offset;
58 size_t end = offset + size;
61 range = &match->range;
63 range = &match->mask->range;
68 if (range->start == range->end) {
74 if (range->start > start)
81 #define SW_FLOW_KEY_PUT(match, field, value, is_mask) \
83 update_range__(match, offsetof(struct sw_flow_key, field), \
84 sizeof((match)->key->field), is_mask); \
85 if (is_mask && match->mask != NULL) { \
86 (match)->mask->key.field = value; \
88 (match)->key->field = value; \
92 #define SW_FLOW_KEY_MEMCPY(match, field, value_p, len, is_mask) \
94 update_range__(match, offsetof(struct sw_flow_key, field), \
96 if (is_mask && match->mask != NULL) { \
97 memcpy(&(match)->mask->key.field, value_p, len); \
99 memcpy(&(match)->key->field, value_p, len); \
103 void ovs_match_init(struct sw_flow_match *match,
104 struct sw_flow_key *key,
105 struct sw_flow_mask *mask)
107 memset(match, 0, sizeof(*match));
111 memset(key, 0, sizeof(*key));
114 memset(&mask->key, 0, sizeof(mask->key));
115 mask->range.start = mask->range.end = 0;
119 static bool ovs_match_validate(const struct sw_flow_match *match,
120 u64 key_attrs, u64 mask_attrs)
122 u64 key_expected = 1ULL << OVS_KEY_ATTR_ETHERNET;
123 u64 mask_allowed = key_attrs; /* At most allow all key attributes */
125 /* The following mask attributes allowed only if they
126 * pass the validation tests. */
127 mask_allowed &= ~((1ULL << OVS_KEY_ATTR_IPV4)
128 | (1ULL << OVS_KEY_ATTR_IPV6)
129 | (1ULL << OVS_KEY_ATTR_TCP)
130 | (1ULL << OVS_KEY_ATTR_UDP)
131 | (1ULL << OVS_KEY_ATTR_ICMP)
132 | (1ULL << OVS_KEY_ATTR_ICMPV6)
133 | (1ULL << OVS_KEY_ATTR_ARP)
134 | (1ULL << OVS_KEY_ATTR_ND));
136 if (match->key->eth.type == htons(ETH_P_802_2) &&
137 match->mask && (match->mask->key.eth.type == htons(0xffff)))
138 mask_allowed |= (1ULL << OVS_KEY_ATTR_ETHERTYPE);
140 /* Check key attributes. */
141 if (match->key->eth.type == htons(ETH_P_ARP)
142 || match->key->eth.type == htons(ETH_P_RARP)) {
143 key_expected |= 1ULL << OVS_KEY_ATTR_ARP;
144 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
145 mask_allowed |= 1ULL << OVS_KEY_ATTR_ARP;
148 if (match->key->eth.type == htons(ETH_P_IP)) {
149 key_expected |= 1ULL << OVS_KEY_ATTR_IPV4;
150 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
151 mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV4;
153 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
154 if (match->key->ip.proto == IPPROTO_UDP) {
155 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
156 if (match->mask && (match->mask->key.ip.proto == 0xff))
157 mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
160 if (match->key->ip.proto == IPPROTO_TCP) {
161 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
162 if (match->mask && (match->mask->key.ip.proto == 0xff))
163 mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
166 if (match->key->ip.proto == IPPROTO_ICMP) {
167 key_expected |= 1ULL << OVS_KEY_ATTR_ICMP;
168 if (match->mask && (match->mask->key.ip.proto == 0xff))
169 mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMP;
174 if (match->key->eth.type == htons(ETH_P_IPV6)) {
175 key_expected |= 1ULL << OVS_KEY_ATTR_IPV6;
176 if (match->mask && (match->mask->key.eth.type == htons(0xffff)))
177 mask_allowed |= 1ULL << OVS_KEY_ATTR_IPV6;
179 if (match->key->ip.frag != OVS_FRAG_TYPE_LATER) {
180 if (match->key->ip.proto == IPPROTO_UDP) {
181 key_expected |= 1ULL << OVS_KEY_ATTR_UDP;
182 if (match->mask && (match->mask->key.ip.proto == 0xff))
183 mask_allowed |= 1ULL << OVS_KEY_ATTR_UDP;
186 if (match->key->ip.proto == IPPROTO_TCP) {
187 key_expected |= 1ULL << OVS_KEY_ATTR_TCP;
188 if (match->mask && (match->mask->key.ip.proto == 0xff))
189 mask_allowed |= 1ULL << OVS_KEY_ATTR_TCP;
192 if (match->key->ip.proto == IPPROTO_ICMPV6) {
193 key_expected |= 1ULL << OVS_KEY_ATTR_ICMPV6;
194 if (match->mask && (match->mask->key.ip.proto == 0xff))
195 mask_allowed |= 1ULL << OVS_KEY_ATTR_ICMPV6;
197 if (match->key->ipv6.tp.src ==
198 htons(NDISC_NEIGHBOUR_SOLICITATION) ||
199 match->key->ipv6.tp.src == htons(NDISC_NEIGHBOUR_ADVERTISEMENT)) {
200 key_expected |= 1ULL << OVS_KEY_ATTR_ND;
201 if (match->mask && (match->mask->key.ipv6.tp.src == htons(0xffff)))
202 mask_allowed |= 1ULL << OVS_KEY_ATTR_ND;
208 if ((key_attrs & key_expected) != key_expected)
209 /* Key attributes check failed. */
212 if ((mask_attrs & mask_allowed) != mask_attrs)
213 /* Mask attributes check failed. */
219 static int check_header(struct sk_buff *skb, int len)
221 if (unlikely(skb->len < len))
223 if (unlikely(!pskb_may_pull(skb, len)))
228 static bool arphdr_ok(struct sk_buff *skb)
230 return pskb_may_pull(skb, skb_network_offset(skb) +
231 sizeof(struct arp_eth_header));
234 static int check_iphdr(struct sk_buff *skb)
236 unsigned int nh_ofs = skb_network_offset(skb);
240 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
244 ip_len = ip_hdrlen(skb);
245 if (unlikely(ip_len < sizeof(struct iphdr) ||
246 skb->len < nh_ofs + ip_len))
249 skb_set_transport_header(skb, nh_ofs + ip_len);
253 static bool tcphdr_ok(struct sk_buff *skb)
255 int th_ofs = skb_transport_offset(skb);
258 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
261 tcp_len = tcp_hdrlen(skb);
262 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
263 skb->len < th_ofs + tcp_len))
269 static bool udphdr_ok(struct sk_buff *skb)
271 return pskb_may_pull(skb, skb_transport_offset(skb) +
272 sizeof(struct udphdr));
275 static bool icmphdr_ok(struct sk_buff *skb)
277 return pskb_may_pull(skb, skb_transport_offset(skb) +
278 sizeof(struct icmphdr));
281 u64 ovs_flow_used_time(unsigned long flow_jiffies)
283 struct timespec cur_ts;
286 ktime_get_ts(&cur_ts);
287 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
288 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
289 cur_ts.tv_nsec / NSEC_PER_MSEC;
291 return cur_ms - idle_ms;
294 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
296 unsigned int nh_ofs = skb_network_offset(skb);
304 err = check_header(skb, nh_ofs + sizeof(*nh));
309 nexthdr = nh->nexthdr;
310 payload_ofs = (u8 *)(nh + 1) - skb->data;
312 key->ip.proto = NEXTHDR_NONE;
313 key->ip.tos = ipv6_get_dsfield(nh);
314 key->ip.ttl = nh->hop_limit;
315 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
316 key->ipv6.addr.src = nh->saddr;
317 key->ipv6.addr.dst = nh->daddr;
319 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
320 if (unlikely(payload_ofs < 0))
324 if (frag_off & htons(~0x7))
325 key->ip.frag = OVS_FRAG_TYPE_LATER;
327 key->ip.frag = OVS_FRAG_TYPE_FIRST;
330 nh_len = payload_ofs - nh_ofs;
331 skb_set_transport_header(skb, nh_ofs + nh_len);
332 key->ip.proto = nexthdr;
336 static bool icmp6hdr_ok(struct sk_buff *skb)
338 return pskb_may_pull(skb, skb_transport_offset(skb) +
339 sizeof(struct icmp6hdr));
342 static void flow_key_mask(struct sw_flow_key *dst,
343 const struct sw_flow_key *src,
344 const struct sw_flow_mask *mask)
346 u8 *m = (u8 *)&mask->key + mask->range.start;
347 u8 *s = (u8 *)src + mask->range.start;
348 u8 *d = (u8 *)dst + mask->range.start;
351 memset(dst, 0, sizeof(*dst));
352 for (i = 0; i < ovs_sw_flow_mask_size_roundup(mask); i++) {
358 #define TCP_FLAGS_OFFSET 13
359 #define TCP_FLAG_MASK 0x3f
361 void ovs_flow_used(struct sw_flow *flow, struct sk_buff *skb)
365 if ((flow->key.eth.type == htons(ETH_P_IP) ||
366 flow->key.eth.type == htons(ETH_P_IPV6)) &&
367 flow->key.ip.proto == IPPROTO_TCP &&
368 likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
369 u8 *tcp = (u8 *)tcp_hdr(skb);
370 tcp_flags = *(tcp + TCP_FLAGS_OFFSET) & TCP_FLAG_MASK;
373 spin_lock(&flow->lock);
374 flow->used = jiffies;
375 flow->packet_count++;
376 flow->byte_count += skb->len;
377 flow->tcp_flags |= tcp_flags;
378 spin_unlock(&flow->lock);
381 struct sw_flow_actions *ovs_flow_actions_alloc(int size)
383 struct sw_flow_actions *sfa;
385 if (size > MAX_ACTIONS_BUFSIZE)
386 return ERR_PTR(-EINVAL);
388 sfa = kmalloc(sizeof(*sfa) + size, GFP_KERNEL);
390 return ERR_PTR(-ENOMEM);
392 sfa->actions_len = 0;
396 struct sw_flow *ovs_flow_alloc(void)
398 struct sw_flow *flow;
400 flow = kmem_cache_alloc(flow_cache, GFP_KERNEL);
402 return ERR_PTR(-ENOMEM);
404 spin_lock_init(&flow->lock);
405 flow->sf_acts = NULL;
411 static struct hlist_head *find_bucket(struct flow_table *table, u32 hash)
413 hash = jhash_1word(hash, table->hash_seed);
414 return flex_array_get(table->buckets,
415 (hash & (table->n_buckets - 1)));
418 static struct flex_array *alloc_buckets(unsigned int n_buckets)
420 struct flex_array *buckets;
423 buckets = flex_array_alloc(sizeof(struct hlist_head *),
424 n_buckets, GFP_KERNEL);
428 err = flex_array_prealloc(buckets, 0, n_buckets, GFP_KERNEL);
430 flex_array_free(buckets);
434 for (i = 0; i < n_buckets; i++)
435 INIT_HLIST_HEAD((struct hlist_head *)
436 flex_array_get(buckets, i));
441 static void free_buckets(struct flex_array *buckets)
443 flex_array_free(buckets);
446 static struct flow_table *__flow_tbl_alloc(int new_size)
448 struct flow_table *table = kmalloc(sizeof(*table), GFP_KERNEL);
453 table->buckets = alloc_buckets(new_size);
455 if (!table->buckets) {
459 table->n_buckets = new_size;
462 table->keep_flows = false;
463 get_random_bytes(&table->hash_seed, sizeof(u32));
464 table->mask_list = NULL;
469 static void __flow_tbl_destroy(struct flow_table *table)
473 if (table->keep_flows)
476 for (i = 0; i < table->n_buckets; i++) {
477 struct sw_flow *flow;
478 struct hlist_head *head = flex_array_get(table->buckets, i);
479 struct hlist_node *n;
480 int ver = table->node_ver;
482 hlist_for_each_entry_safe(flow, n, head, hash_node[ver]) {
483 hlist_del_rcu(&flow->hash_node[ver]);
484 ovs_flow_free(flow, false);
488 BUG_ON(!list_empty(table->mask_list));
489 kfree(table->mask_list);
492 free_buckets(table->buckets);
496 struct flow_table *ovs_flow_tbl_alloc(int new_size)
498 struct flow_table *table = __flow_tbl_alloc(new_size);
503 table->mask_list = kmalloc(sizeof(struct list_head), GFP_KERNEL);
504 if (!table->mask_list) {
505 table->keep_flows = true;
506 __flow_tbl_destroy(table);
509 INIT_LIST_HEAD(table->mask_list);
514 static void flow_tbl_destroy_rcu_cb(struct rcu_head *rcu)
516 struct flow_table *table = container_of(rcu, struct flow_table, rcu);
518 __flow_tbl_destroy(table);
521 void ovs_flow_tbl_destroy(struct flow_table *table, bool deferred)
527 call_rcu(&table->rcu, flow_tbl_destroy_rcu_cb);
529 __flow_tbl_destroy(table);
532 struct sw_flow *ovs_flow_dump_next(struct flow_table *table, u32 *bucket, u32 *last)
534 struct sw_flow *flow;
535 struct hlist_head *head;
539 ver = table->node_ver;
540 while (*bucket < table->n_buckets) {
542 head = flex_array_get(table->buckets, *bucket);
543 hlist_for_each_entry_rcu(flow, head, hash_node[ver]) {
558 static void __tbl_insert(struct flow_table *table, struct sw_flow *flow)
560 struct hlist_head *head;
562 head = find_bucket(table, flow->hash);
563 hlist_add_head_rcu(&flow->hash_node[table->node_ver], head);
568 static void flow_table_copy_flows(struct flow_table *old, struct flow_table *new)
573 old_ver = old->node_ver;
574 new->node_ver = !old_ver;
576 /* Insert in new table. */
577 for (i = 0; i < old->n_buckets; i++) {
578 struct sw_flow *flow;
579 struct hlist_head *head;
581 head = flex_array_get(old->buckets, i);
583 hlist_for_each_entry(flow, head, hash_node[old_ver])
584 __tbl_insert(new, flow);
587 new->mask_list = old->mask_list;
588 old->keep_flows = true;
591 static struct flow_table *__flow_tbl_rehash(struct flow_table *table, int n_buckets)
593 struct flow_table *new_table;
595 new_table = __flow_tbl_alloc(n_buckets);
597 return ERR_PTR(-ENOMEM);
599 flow_table_copy_flows(table, new_table);
604 struct flow_table *ovs_flow_tbl_rehash(struct flow_table *table)
606 return __flow_tbl_rehash(table, table->n_buckets);
609 struct flow_table *ovs_flow_tbl_expand(struct flow_table *table)
611 return __flow_tbl_rehash(table, table->n_buckets * 2);
614 static void __flow_free(struct sw_flow *flow)
616 kfree((struct sf_flow_acts __force *)flow->sf_acts);
617 kmem_cache_free(flow_cache, flow);
620 static void rcu_free_flow_callback(struct rcu_head *rcu)
622 struct sw_flow *flow = container_of(rcu, struct sw_flow, rcu);
627 void ovs_flow_free(struct sw_flow *flow, bool deferred)
632 ovs_sw_flow_mask_del_ref((struct sw_flow_mask __force *)flow->mask,
636 call_rcu(&flow->rcu, rcu_free_flow_callback);
641 /* RCU callback used by ovs_flow_deferred_free_acts. */
642 static void rcu_free_acts_callback(struct rcu_head *rcu)
644 struct sw_flow_actions *sf_acts = container_of(rcu,
645 struct sw_flow_actions, rcu);
649 /* Schedules 'sf_acts' to be freed after the next RCU grace period.
650 * The caller must hold rcu_read_lock for this to be sensible. */
651 void ovs_flow_deferred_free_acts(struct sw_flow_actions *sf_acts)
653 call_rcu(&sf_acts->rcu, rcu_free_acts_callback);
656 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
659 __be16 eth_type; /* ETH_P_8021Q */
662 struct qtag_prefix *qp;
664 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
667 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
671 qp = (struct qtag_prefix *) skb->data;
672 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
673 __skb_pull(skb, sizeof(struct qtag_prefix));
678 static __be16 parse_ethertype(struct sk_buff *skb)
680 struct llc_snap_hdr {
681 u8 dsap; /* Always 0xAA */
682 u8 ssap; /* Always 0xAA */
687 struct llc_snap_hdr *llc;
690 proto = *(__be16 *) skb->data;
691 __skb_pull(skb, sizeof(__be16));
693 if (ntohs(proto) >= ETH_P_802_3_MIN)
696 if (skb->len < sizeof(struct llc_snap_hdr))
697 return htons(ETH_P_802_2);
699 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
702 llc = (struct llc_snap_hdr *) skb->data;
703 if (llc->dsap != LLC_SAP_SNAP ||
704 llc->ssap != LLC_SAP_SNAP ||
705 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
706 return htons(ETH_P_802_2);
708 __skb_pull(skb, sizeof(struct llc_snap_hdr));
710 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
711 return llc->ethertype;
713 return htons(ETH_P_802_2);
716 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
719 struct icmp6hdr *icmp = icmp6_hdr(skb);
721 /* The ICMPv6 type and code fields use the 16-bit transport port
722 * fields, so we need to store them in 16-bit network byte order.
724 key->ipv6.tp.src = htons(icmp->icmp6_type);
725 key->ipv6.tp.dst = htons(icmp->icmp6_code);
727 if (icmp->icmp6_code == 0 &&
728 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
729 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
730 int icmp_len = skb->len - skb_transport_offset(skb);
734 /* In order to process neighbor discovery options, we need the
737 if (unlikely(icmp_len < sizeof(*nd)))
740 if (unlikely(skb_linearize(skb)))
743 nd = (struct nd_msg *)skb_transport_header(skb);
744 key->ipv6.nd.target = nd->target;
746 icmp_len -= sizeof(*nd);
748 while (icmp_len >= 8) {
749 struct nd_opt_hdr *nd_opt =
750 (struct nd_opt_hdr *)(nd->opt + offset);
751 int opt_len = nd_opt->nd_opt_len * 8;
753 if (unlikely(!opt_len || opt_len > icmp_len))
756 /* Store the link layer address if the appropriate
757 * option is provided. It is considered an error if
758 * the same link layer option is specified twice.
760 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
762 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
764 memcpy(key->ipv6.nd.sll,
765 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
766 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
768 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
770 memcpy(key->ipv6.nd.tll,
771 &nd->opt[offset+sizeof(*nd_opt)], ETH_ALEN);
782 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
783 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
784 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
790 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
791 * @skb: sk_buff that contains the frame, with skb->data pointing to the
793 * @in_port: port number on which @skb was received.
794 * @key: output flow key
795 * @key_lenp: length of output flow key
797 * The caller must ensure that skb->len >= ETH_HLEN.
799 * Returns 0 if successful, otherwise a negative errno value.
801 * Initializes @skb header pointers as follows:
803 * - skb->mac_header: the Ethernet header.
805 * - skb->network_header: just past the Ethernet header, or just past the
806 * VLAN header, to the first byte of the Ethernet payload.
808 * - skb->transport_header: If key->dl_type is ETH_P_IP or ETH_P_IPV6
809 * on output, then just past the IP header, if one is present and
810 * of a correct length, otherwise the same as skb->network_header.
811 * For other key->dl_type values it is left untouched.
813 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
818 memset(key, 0, sizeof(*key));
820 key->phy.priority = skb->priority;
821 if (OVS_CB(skb)->tun_key)
822 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
823 key->phy.in_port = in_port;
824 key->phy.skb_mark = skb_get_mark(skb);
826 skb_reset_mac_header(skb);
828 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
829 * header in the linear data area.
832 memcpy(key->eth.src, eth->h_source, ETH_ALEN);
833 memcpy(key->eth.dst, eth->h_dest, ETH_ALEN);
835 __skb_pull(skb, 2 * ETH_ALEN);
837 if (vlan_tx_tag_present(skb))
838 key->eth.tci = htons(vlan_get_tci(skb));
839 else if (eth->h_proto == htons(ETH_P_8021Q))
840 if (unlikely(parse_vlan(skb, key)))
843 key->eth.type = parse_ethertype(skb);
844 if (unlikely(key->eth.type == htons(0)))
847 skb_reset_network_header(skb);
848 __skb_push(skb, skb->data - skb_mac_header(skb));
851 if (key->eth.type == htons(ETH_P_IP)) {
855 error = check_iphdr(skb);
856 if (unlikely(error)) {
857 if (error == -EINVAL) {
858 skb->transport_header = skb->network_header;
865 key->ipv4.addr.src = nh->saddr;
866 key->ipv4.addr.dst = nh->daddr;
868 key->ip.proto = nh->protocol;
869 key->ip.tos = nh->tos;
870 key->ip.ttl = nh->ttl;
872 offset = nh->frag_off & htons(IP_OFFSET);
874 key->ip.frag = OVS_FRAG_TYPE_LATER;
877 if (nh->frag_off & htons(IP_MF) ||
878 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
879 key->ip.frag = OVS_FRAG_TYPE_FIRST;
881 /* Transport layer. */
882 if (key->ip.proto == IPPROTO_TCP) {
883 if (tcphdr_ok(skb)) {
884 struct tcphdr *tcp = tcp_hdr(skb);
885 key->ipv4.tp.src = tcp->source;
886 key->ipv4.tp.dst = tcp->dest;
888 } else if (key->ip.proto == IPPROTO_UDP) {
889 if (udphdr_ok(skb)) {
890 struct udphdr *udp = udp_hdr(skb);
891 key->ipv4.tp.src = udp->source;
892 key->ipv4.tp.dst = udp->dest;
894 } else if (key->ip.proto == IPPROTO_ICMP) {
895 if (icmphdr_ok(skb)) {
896 struct icmphdr *icmp = icmp_hdr(skb);
897 /* The ICMP type and code fields use the 16-bit
898 * transport port fields, so we need to store
899 * them in 16-bit network byte order. */
900 key->ipv4.tp.src = htons(icmp->type);
901 key->ipv4.tp.dst = htons(icmp->code);
905 } else if ((key->eth.type == htons(ETH_P_ARP) ||
906 key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
907 struct arp_eth_header *arp;
909 arp = (struct arp_eth_header *)skb_network_header(skb);
911 if (arp->ar_hrd == htons(ARPHRD_ETHER)
912 && arp->ar_pro == htons(ETH_P_IP)
913 && arp->ar_hln == ETH_ALEN
914 && arp->ar_pln == 4) {
916 /* We only match on the lower 8 bits of the opcode. */
917 if (ntohs(arp->ar_op) <= 0xff)
918 key->ip.proto = ntohs(arp->ar_op);
919 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
920 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
921 memcpy(key->ipv4.arp.sha, arp->ar_sha, ETH_ALEN);
922 memcpy(key->ipv4.arp.tha, arp->ar_tha, ETH_ALEN);
924 } else if (key->eth.type == htons(ETH_P_IPV6)) {
925 int nh_len; /* IPv6 Header + Extensions */
927 nh_len = parse_ipv6hdr(skb, key);
928 if (unlikely(nh_len < 0)) {
929 if (nh_len == -EINVAL) {
930 skb->transport_header = skb->network_header;
938 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
940 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
941 key->ip.frag = OVS_FRAG_TYPE_FIRST;
943 /* Transport layer. */
944 if (key->ip.proto == NEXTHDR_TCP) {
945 if (tcphdr_ok(skb)) {
946 struct tcphdr *tcp = tcp_hdr(skb);
947 key->ipv6.tp.src = tcp->source;
948 key->ipv6.tp.dst = tcp->dest;
950 } else if (key->ip.proto == NEXTHDR_UDP) {
951 if (udphdr_ok(skb)) {
952 struct udphdr *udp = udp_hdr(skb);
953 key->ipv6.tp.src = udp->source;
954 key->ipv6.tp.dst = udp->dest;
956 } else if (key->ip.proto == NEXTHDR_ICMP) {
957 if (icmp6hdr_ok(skb)) {
958 error = parse_icmpv6(skb, key, nh_len);
968 static u32 ovs_flow_hash(const struct sw_flow_key *key, int key_start, int key_len)
970 return jhash2((u32 *)((u8 *)key + key_start),
971 DIV_ROUND_UP(key_len - key_start, sizeof(u32)), 0);
974 static int flow_key_start(const struct sw_flow_key *key)
976 if (key->tun_key.ipv4_dst)
979 return offsetof(struct sw_flow_key, phy);
982 static bool __cmp_key(const struct sw_flow_key *key1,
983 const struct sw_flow_key *key2, int key_start, int key_len)
985 return !memcmp((u8 *)key1 + key_start,
986 (u8 *)key2 + key_start, (key_len - key_start));
989 static bool __flow_cmp_key(const struct sw_flow *flow,
990 const struct sw_flow_key *key, int key_start, int key_len)
992 return __cmp_key(&flow->key, key, key_start, key_len);
995 static bool __flow_cmp_unmasked_key(const struct sw_flow *flow,
996 const struct sw_flow_key *key, int key_start, int key_len)
998 return __cmp_key(&flow->unmasked_key, key, key_start, key_len);
1001 bool ovs_flow_cmp_unmasked_key(const struct sw_flow *flow,
1002 const struct sw_flow_key *key, int key_len)
1005 key_start = flow_key_start(key);
1007 return __flow_cmp_unmasked_key(flow, key, key_start, key_len);
1011 struct sw_flow *ovs_flow_lookup_unmasked_key(struct flow_table *table,
1012 struct sw_flow_match *match)
1014 struct sw_flow_key *unmasked = match->key;
1015 int key_len = match->range.end;
1016 struct sw_flow *flow;
1018 flow = ovs_flow_lookup(table, unmasked);
1019 if (flow && (!ovs_flow_cmp_unmasked_key(flow, unmasked, key_len)))
1025 static struct sw_flow *ovs_masked_flow_lookup(struct flow_table *table,
1026 const struct sw_flow_key *flow_key,
1027 struct sw_flow_mask *mask)
1029 struct sw_flow *flow;
1030 struct hlist_head *head;
1031 int key_start = mask->range.start;
1032 int key_len = mask->range.end;
1034 struct sw_flow_key masked_key;
1036 flow_key_mask(&masked_key, flow_key, mask);
1037 hash = ovs_flow_hash(&masked_key, key_start, key_len);
1038 head = find_bucket(table, hash);
1039 hlist_for_each_entry_rcu(flow, head, hash_node[table->node_ver]) {
1040 if (__flow_cmp_key(flow, &masked_key, key_start, key_len))
1046 struct sw_flow *ovs_flow_lookup(struct flow_table *tbl,
1047 const struct sw_flow_key *key)
1049 struct sw_flow *flow = NULL;
1050 struct sw_flow_mask *mask;
1052 list_for_each_entry_rcu(mask, tbl->mask_list, list) {
1053 flow = ovs_masked_flow_lookup(tbl, key, mask);
1054 if (flow) /* Found */
1062 void ovs_flow_insert(struct flow_table *table, struct sw_flow *flow,
1063 const struct sw_flow_key *key, int key_len)
1065 flow->unmasked_key = *key;
1066 flow_key_mask(&flow->key, &flow->unmasked_key, ovsl_dereference(flow->mask));
1067 flow->hash = ovs_flow_hash(&flow->key,
1068 ovsl_dereference(flow->mask)->range.start,
1069 ovsl_dereference(flow->mask)->range.end);
1070 __tbl_insert(table, flow);
1073 void ovs_flow_remove(struct flow_table *table, struct sw_flow *flow)
1075 BUG_ON(table->count == 0);
1076 hlist_del_rcu(&flow->hash_node[table->node_ver]);
1080 /* The size of the argument for each %OVS_KEY_ATTR_* Netlink attribute. */
1081 const int ovs_key_lens[OVS_KEY_ATTR_MAX + 1] = {
1082 [OVS_KEY_ATTR_ENCAP] = -1,
1083 [OVS_KEY_ATTR_PRIORITY] = sizeof(u32),
1084 [OVS_KEY_ATTR_IN_PORT] = sizeof(u32),
1085 [OVS_KEY_ATTR_SKB_MARK] = sizeof(u32),
1086 [OVS_KEY_ATTR_ETHERNET] = sizeof(struct ovs_key_ethernet),
1087 [OVS_KEY_ATTR_VLAN] = sizeof(__be16),
1088 [OVS_KEY_ATTR_ETHERTYPE] = sizeof(__be16),
1089 [OVS_KEY_ATTR_IPV4] = sizeof(struct ovs_key_ipv4),
1090 [OVS_KEY_ATTR_IPV6] = sizeof(struct ovs_key_ipv6),
1091 [OVS_KEY_ATTR_TCP] = sizeof(struct ovs_key_tcp),
1092 [OVS_KEY_ATTR_UDP] = sizeof(struct ovs_key_udp),
1093 [OVS_KEY_ATTR_ICMP] = sizeof(struct ovs_key_icmp),
1094 [OVS_KEY_ATTR_ICMPV6] = sizeof(struct ovs_key_icmpv6),
1095 [OVS_KEY_ATTR_ARP] = sizeof(struct ovs_key_arp),
1096 [OVS_KEY_ATTR_ND] = sizeof(struct ovs_key_nd),
1097 [OVS_KEY_ATTR_TUNNEL] = -1,
1100 static bool is_all_zero(const u8 *fp, size_t size)
1107 for (i = 0; i < size; i++)
1114 static int __parse_flow_nlattrs(const struct nlattr *attr,
1115 const struct nlattr *a[],
1116 u64 *attrsp, bool nz)
1118 const struct nlattr *nla;
1123 nla_for_each_nested(nla, attr, rem) {
1124 u16 type = nla_type(nla);
1127 if (type > OVS_KEY_ATTR_MAX || attrs & (1ULL << type))
1130 expected_len = ovs_key_lens[type];
1131 if (nla_len(nla) != expected_len && expected_len != -1)
1134 if (attrs & (1ULL << type))
1135 /* Duplicated field. */
1138 if (!nz || !is_all_zero(nla_data(nla), expected_len)) {
1139 attrs |= 1ULL << type;
1150 static int parse_flow_mask_nlattrs(const struct nlattr *attr,
1151 const struct nlattr *a[], u64 *attrsp)
1153 return __parse_flow_nlattrs(attr, a, attrsp, true);
1156 static int parse_flow_nlattrs(const struct nlattr *attr,
1157 const struct nlattr *a[], u64 *attrsp)
1159 return __parse_flow_nlattrs(attr, a, attrsp, false);
1162 int ipv4_tun_from_nlattr(const struct nlattr *attr,
1163 struct sw_flow_match *match, bool is_mask)
1170 nla_for_each_nested(a, attr, rem) {
1171 int type = nla_type(a);
1172 static const u32 ovs_tunnel_key_lens[OVS_TUNNEL_KEY_ATTR_MAX + 1] = {
1173 [OVS_TUNNEL_KEY_ATTR_ID] = sizeof(u64),
1174 [OVS_TUNNEL_KEY_ATTR_IPV4_SRC] = sizeof(u32),
1175 [OVS_TUNNEL_KEY_ATTR_IPV4_DST] = sizeof(u32),
1176 [OVS_TUNNEL_KEY_ATTR_TOS] = 1,
1177 [OVS_TUNNEL_KEY_ATTR_TTL] = 1,
1178 [OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT] = 0,
1179 [OVS_TUNNEL_KEY_ATTR_CSUM] = 0,
1182 if (type > OVS_TUNNEL_KEY_ATTR_MAX ||
1183 ovs_tunnel_key_lens[type] != nla_len(a))
1187 case OVS_TUNNEL_KEY_ATTR_ID:
1188 SW_FLOW_KEY_PUT(match, tun_key.tun_id,
1189 nla_get_be64(a), is_mask);
1190 tun_flags |= OVS_TNL_F_KEY;
1192 case OVS_TUNNEL_KEY_ATTR_IPV4_SRC:
1193 SW_FLOW_KEY_PUT(match, tun_key.ipv4_src,
1194 nla_get_be32(a), is_mask);
1196 case OVS_TUNNEL_KEY_ATTR_IPV4_DST:
1197 SW_FLOW_KEY_PUT(match, tun_key.ipv4_dst,
1198 nla_get_be32(a), is_mask);
1200 case OVS_TUNNEL_KEY_ATTR_TOS:
1201 SW_FLOW_KEY_PUT(match, tun_key.ipv4_tos,
1202 nla_get_u8(a), is_mask);
1204 case OVS_TUNNEL_KEY_ATTR_TTL:
1205 SW_FLOW_KEY_PUT(match, tun_key.ipv4_ttl,
1206 nla_get_u8(a), is_mask);
1209 case OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT:
1210 tun_flags |= OVS_TNL_F_DONT_FRAGMENT;
1212 case OVS_TUNNEL_KEY_ATTR_CSUM:
1213 tun_flags |= OVS_TNL_F_CSUM;
1220 SW_FLOW_KEY_PUT(match, tun_key.tun_flags, tun_flags, is_mask);
1225 if (!match->key->tun_key.ipv4_dst)
1234 int ipv4_tun_to_nlattr(struct sk_buff *skb,
1235 const struct ovs_key_ipv4_tunnel *tun_key,
1236 const struct ovs_key_ipv4_tunnel *output)
1240 nla = nla_nest_start(skb, OVS_KEY_ATTR_TUNNEL);
1244 if (tun_key->tun_flags & OVS_TNL_F_KEY &&
1245 nla_put_be64(skb, OVS_TUNNEL_KEY_ATTR_ID, output->tun_id))
1247 if (tun_key->ipv4_src &&
1248 nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_SRC, output->ipv4_src))
1250 if (nla_put_be32(skb, OVS_TUNNEL_KEY_ATTR_IPV4_DST, output->ipv4_dst))
1252 if (tun_key->ipv4_tos &&
1253 nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TOS, output->ipv4_tos))
1255 if (nla_put_u8(skb, OVS_TUNNEL_KEY_ATTR_TTL, output->ipv4_ttl))
1257 if ((tun_key->tun_flags & OVS_TNL_F_DONT_FRAGMENT) &&
1258 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT))
1260 if ((tun_key->tun_flags & OVS_TNL_F_CSUM) &&
1261 nla_put_flag(skb, OVS_TUNNEL_KEY_ATTR_CSUM))
1264 nla_nest_end(skb, nla);
1269 static int metadata_from_nlattrs(struct sw_flow_match *match, u64 *attrs,
1270 const struct nlattr **a, bool is_mask)
1272 if (*attrs & (1ULL << OVS_KEY_ATTR_PRIORITY)) {
1273 SW_FLOW_KEY_PUT(match, phy.priority,
1274 nla_get_u32(a[OVS_KEY_ATTR_PRIORITY]), is_mask);
1275 *attrs &= ~(1ULL << OVS_KEY_ATTR_PRIORITY);
1278 if (*attrs & (1ULL << OVS_KEY_ATTR_IN_PORT)) {
1279 u32 in_port = nla_get_u32(a[OVS_KEY_ATTR_IN_PORT]);
1281 if (!is_mask && in_port >= DP_MAX_PORTS)
1283 SW_FLOW_KEY_PUT(match, phy.in_port, in_port, is_mask);
1284 *attrs &= ~(1ULL << OVS_KEY_ATTR_IN_PORT);
1287 if (*attrs & (1ULL << OVS_KEY_ATTR_SKB_MARK)) {
1288 uint32_t mark = nla_get_u32(a[OVS_KEY_ATTR_SKB_MARK]);
1289 #if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20) && !defined(CONFIG_NETFILTER)
1290 if (!is_mask && mark != 0)
1293 SW_FLOW_KEY_PUT(match, phy.skb_mark, mark, is_mask);
1294 *attrs &= ~(1ULL << OVS_KEY_ATTR_SKB_MARK);
1296 if (*attrs & (1ULL << OVS_KEY_ATTR_TUNNEL)) {
1297 if (ipv4_tun_from_nlattr(a[OVS_KEY_ATTR_TUNNEL], match,
1300 *attrs &= ~(1ULL << OVS_KEY_ATTR_TUNNEL);
1305 static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs,
1306 const struct nlattr **a, bool is_mask)
1309 u64 orig_attrs = attrs;
1311 err = metadata_from_nlattrs(match, &attrs, a, is_mask);
1315 if (attrs & (1ULL << OVS_KEY_ATTR_ETHERNET)) {
1316 const struct ovs_key_ethernet *eth_key;
1318 eth_key = nla_data(a[OVS_KEY_ATTR_ETHERNET]);
1319 SW_FLOW_KEY_MEMCPY(match, eth.src,
1320 eth_key->eth_src, ETH_ALEN, is_mask);
1321 SW_FLOW_KEY_MEMCPY(match, eth.dst,
1322 eth_key->eth_dst, ETH_ALEN, is_mask);
1323 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERNET);
1326 if (attrs & (1ULL << OVS_KEY_ATTR_VLAN)) {
1329 tci = nla_get_be16(a[OVS_KEY_ATTR_VLAN]);
1331 if (!(tci & htons(VLAN_TAG_PRESENT)))
1334 SW_FLOW_KEY_PUT(match, eth.tci, tci, is_mask);
1335 attrs &= ~(1ULL << OVS_KEY_ATTR_VLAN);
1338 if (attrs & (1ULL << OVS_KEY_ATTR_ETHERTYPE)) {
1341 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1342 if (!is_mask && ntohs(eth_type) < ETH_P_802_3_MIN)
1345 SW_FLOW_KEY_PUT(match, eth.type, eth_type, is_mask);
1346 attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1347 } else if (!is_mask) {
1348 SW_FLOW_KEY_PUT(match, eth.type, htons(ETH_P_802_2), is_mask);
1351 if (attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1352 const struct ovs_key_ipv4 *ipv4_key;
1354 ipv4_key = nla_data(a[OVS_KEY_ATTR_IPV4]);
1355 if (!is_mask && ipv4_key->ipv4_frag > OVS_FRAG_TYPE_MAX)
1357 SW_FLOW_KEY_PUT(match, ip.proto,
1358 ipv4_key->ipv4_proto, is_mask);
1359 SW_FLOW_KEY_PUT(match, ip.tos,
1360 ipv4_key->ipv4_tos, is_mask);
1361 SW_FLOW_KEY_PUT(match, ip.ttl,
1362 ipv4_key->ipv4_ttl, is_mask);
1363 SW_FLOW_KEY_PUT(match, ip.frag,
1364 ipv4_key->ipv4_frag, is_mask);
1365 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1366 ipv4_key->ipv4_src, is_mask);
1367 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1368 ipv4_key->ipv4_dst, is_mask);
1369 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV4);
1372 if (attrs & (1ULL << OVS_KEY_ATTR_IPV6)) {
1373 const struct ovs_key_ipv6 *ipv6_key;
1375 ipv6_key = nla_data(a[OVS_KEY_ATTR_IPV6]);
1376 if (!is_mask && ipv6_key->ipv6_frag > OVS_FRAG_TYPE_MAX)
1378 SW_FLOW_KEY_PUT(match, ipv6.label,
1379 ipv6_key->ipv6_label, is_mask);
1380 SW_FLOW_KEY_PUT(match, ip.proto,
1381 ipv6_key->ipv6_proto, is_mask);
1382 SW_FLOW_KEY_PUT(match, ip.tos,
1383 ipv6_key->ipv6_tclass, is_mask);
1384 SW_FLOW_KEY_PUT(match, ip.ttl,
1385 ipv6_key->ipv6_hlimit, is_mask);
1386 SW_FLOW_KEY_PUT(match, ip.frag,
1387 ipv6_key->ipv6_frag, is_mask);
1388 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.src,
1390 sizeof(match->key->ipv6.addr.src),
1392 SW_FLOW_KEY_MEMCPY(match, ipv6.addr.dst,
1394 sizeof(match->key->ipv6.addr.dst),
1397 attrs &= ~(1ULL << OVS_KEY_ATTR_IPV6);
1400 if (attrs & (1ULL << OVS_KEY_ATTR_ARP)) {
1401 const struct ovs_key_arp *arp_key;
1403 arp_key = nla_data(a[OVS_KEY_ATTR_ARP]);
1404 if (!is_mask && (arp_key->arp_op & htons(0xff00)))
1407 SW_FLOW_KEY_PUT(match, ipv4.addr.src,
1408 arp_key->arp_sip, is_mask);
1409 SW_FLOW_KEY_PUT(match, ipv4.addr.dst,
1410 arp_key->arp_tip, is_mask);
1411 SW_FLOW_KEY_PUT(match, ip.proto,
1412 ntohs(arp_key->arp_op), is_mask);
1413 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.sha,
1414 arp_key->arp_sha, ETH_ALEN, is_mask);
1415 SW_FLOW_KEY_MEMCPY(match, ipv4.arp.tha,
1416 arp_key->arp_tha, ETH_ALEN, is_mask);
1418 attrs &= ~(1ULL << OVS_KEY_ATTR_ARP);
1421 if (attrs & (1ULL << OVS_KEY_ATTR_TCP)) {
1422 const struct ovs_key_tcp *tcp_key;
1424 tcp_key = nla_data(a[OVS_KEY_ATTR_TCP]);
1425 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1426 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1427 tcp_key->tcp_src, is_mask);
1428 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1429 tcp_key->tcp_dst, is_mask);
1431 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1432 tcp_key->tcp_src, is_mask);
1433 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1434 tcp_key->tcp_dst, is_mask);
1436 attrs &= ~(1ULL << OVS_KEY_ATTR_TCP);
1439 if (attrs & (1ULL << OVS_KEY_ATTR_UDP)) {
1440 const struct ovs_key_udp *udp_key;
1442 udp_key = nla_data(a[OVS_KEY_ATTR_UDP]);
1443 if (orig_attrs & (1ULL << OVS_KEY_ATTR_IPV4)) {
1444 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1445 udp_key->udp_src, is_mask);
1446 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1447 udp_key->udp_dst, is_mask);
1449 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1450 udp_key->udp_src, is_mask);
1451 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1452 udp_key->udp_dst, is_mask);
1454 attrs &= ~(1ULL << OVS_KEY_ATTR_UDP);
1457 if (attrs & (1ULL << OVS_KEY_ATTR_ICMP)) {
1458 const struct ovs_key_icmp *icmp_key;
1460 icmp_key = nla_data(a[OVS_KEY_ATTR_ICMP]);
1461 SW_FLOW_KEY_PUT(match, ipv4.tp.src,
1462 htons(icmp_key->icmp_type), is_mask);
1463 SW_FLOW_KEY_PUT(match, ipv4.tp.dst,
1464 htons(icmp_key->icmp_code), is_mask);
1465 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMP);
1468 if (attrs & (1ULL << OVS_KEY_ATTR_ICMPV6)) {
1469 const struct ovs_key_icmpv6 *icmpv6_key;
1471 icmpv6_key = nla_data(a[OVS_KEY_ATTR_ICMPV6]);
1472 SW_FLOW_KEY_PUT(match, ipv6.tp.src,
1473 htons(icmpv6_key->icmpv6_type), is_mask);
1474 SW_FLOW_KEY_PUT(match, ipv6.tp.dst,
1475 htons(icmpv6_key->icmpv6_code), is_mask);
1476 attrs &= ~(1ULL << OVS_KEY_ATTR_ICMPV6);
1479 if (attrs & (1ULL << OVS_KEY_ATTR_ND)) {
1480 const struct ovs_key_nd *nd_key;
1482 nd_key = nla_data(a[OVS_KEY_ATTR_ND]);
1483 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.target,
1485 sizeof(match->key->ipv6.nd.target),
1487 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.sll,
1488 nd_key->nd_sll, ETH_ALEN, is_mask);
1489 SW_FLOW_KEY_MEMCPY(match, ipv6.nd.tll,
1490 nd_key->nd_tll, ETH_ALEN, is_mask);
1491 attrs &= ~(1ULL << OVS_KEY_ATTR_ND);
1501 * ovs_match_from_nlattrs - parses Netlink attributes into a flow key and
1502 * mask. In case the 'mask' is NULL, the flow is treated as exact match
1503 * flow. Otherwise, it is treated as a wildcarded flow, except the mask
1504 * does not include any don't care bit.
1505 * @match: receives the extracted flow match information.
1506 * @key: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1507 * sequence. The fields should of the packet that triggered the creation
1509 * @mask: Optional. Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink
1510 * attribute specifies the mask field of the wildcarded flow.
1512 int ovs_match_from_nlattrs(struct sw_flow_match *match,
1513 const struct nlattr *key,
1514 const struct nlattr *mask)
1516 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1517 const struct nlattr *encap;
1520 bool encap_valid = false;
1523 err = parse_flow_nlattrs(key, a, &key_attrs);
1527 if (key_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) {
1528 encap = a[OVS_KEY_ATTR_ENCAP];
1529 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1530 if (nla_len(encap)) {
1531 __be16 eth_type = 0; /* ETH_P_8021Q */
1533 if (a[OVS_KEY_ATTR_ETHERTYPE])
1534 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1536 if ((eth_type == htons(ETH_P_8021Q)) && (a[OVS_KEY_ATTR_VLAN])) {
1538 key_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1539 err = parse_flow_nlattrs(encap, a, &key_attrs);
1548 err = ovs_key_from_nlattrs(match, key_attrs, a, false);
1553 err = parse_flow_mask_nlattrs(mask, a, &mask_attrs);
1557 if ((mask_attrs & 1ULL << OVS_KEY_ATTR_ENCAP) && encap_valid) {
1558 __be16 eth_type = 0;
1560 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ENCAP);
1561 if (a[OVS_KEY_ATTR_ETHERTYPE])
1562 eth_type = nla_get_be16(a[OVS_KEY_ATTR_ETHERTYPE]);
1563 if (eth_type == htons(0xffff)) {
1564 mask_attrs &= ~(1ULL << OVS_KEY_ATTR_ETHERTYPE);
1565 encap = a[OVS_KEY_ATTR_ENCAP];
1566 err = parse_flow_mask_nlattrs(encap, a, &mask_attrs);
1574 err = ovs_key_from_nlattrs(match, mask_attrs, a, true);
1578 /* Populate exact match flow's key mask. */
1580 ovs_sw_flow_mask_set(match->mask, &match->range, 0xff);
1583 if (!ovs_match_validate(match, key_attrs, mask_attrs))
1590 * ovs_flow_metadata_from_nlattrs - parses Netlink attributes into a flow key.
1591 * @flow: Receives extracted in_port, priority, tun_key and skb_mark.
1592 * @attr: Netlink attribute holding nested %OVS_KEY_ATTR_* Netlink attribute
1595 * This parses a series of Netlink attributes that form a flow key, which must
1596 * take the same form accepted by flow_from_nlattrs(), but only enough of it to
1597 * get the metadata, that is, the parts of the flow key that cannot be
1598 * extracted from the packet itself.
1601 int ovs_flow_metadata_from_nlattrs(struct sw_flow *flow,
1602 const struct nlattr *attr)
1604 struct ovs_key_ipv4_tunnel *tun_key = &flow->key.tun_key;
1605 const struct nlattr *a[OVS_KEY_ATTR_MAX + 1];
1608 struct sw_flow_match match;
1610 flow->key.phy.in_port = DP_MAX_PORTS;
1611 flow->key.phy.priority = 0;
1612 flow->key.phy.skb_mark = 0;
1613 memset(tun_key, 0, sizeof(flow->key.tun_key));
1615 err = parse_flow_nlattrs(attr, a, &attrs);
1619 memset(&match, 0, sizeof(match));
1620 match.key = &flow->key;
1622 err = metadata_from_nlattrs(&match, &attrs, a, false);
1629 int ovs_flow_to_nlattrs(const struct sw_flow_key *swkey,
1630 const struct sw_flow_key *output, struct sk_buff *skb)
1632 struct ovs_key_ethernet *eth_key;
1633 struct nlattr *nla, *encap;
1635 if (swkey->phy.priority &&
1636 nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
1637 goto nla_put_failure;
1639 if (swkey->tun_key.ipv4_dst &&
1640 ipv4_tun_to_nlattr(skb, &swkey->tun_key, &output->tun_key))
1641 goto nla_put_failure;
1643 if (swkey->phy.in_port != DP_MAX_PORTS) {
1644 /* Exact match upper 16 bits. */
1646 upper_u16 = (swkey == output) ? 0 : 0xffff;
1648 if (nla_put_u32(skb, OVS_KEY_ATTR_IN_PORT,
1649 (upper_u16 << 16) | output->phy.in_port))
1650 goto nla_put_failure;
1653 if (swkey->phy.skb_mark &&
1654 nla_put_u32(skb, OVS_KEY_ATTR_SKB_MARK, output->phy.skb_mark))
1655 goto nla_put_failure;
1657 nla = nla_reserve(skb, OVS_KEY_ATTR_ETHERNET, sizeof(*eth_key));
1659 goto nla_put_failure;
1661 eth_key = nla_data(nla);
1662 memcpy(eth_key->eth_src, output->eth.src, ETH_ALEN);
1663 memcpy(eth_key->eth_dst, output->eth.dst, ETH_ALEN);
1665 if (swkey->eth.tci || swkey->eth.type == htons(ETH_P_8021Q)) {
1667 eth_type = (swkey == output) ? htons(ETH_P_8021Q) : htons(0xffff) ;
1668 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, eth_type) ||
1669 nla_put_be16(skb, OVS_KEY_ATTR_VLAN, output->eth.tci))
1670 goto nla_put_failure;
1671 encap = nla_nest_start(skb, OVS_KEY_ATTR_ENCAP);
1672 if (!swkey->eth.tci)
1677 if ((swkey == output) && (swkey->eth.type == htons(ETH_P_802_2)))
1680 if (output->eth.type != 0)
1681 if (nla_put_be16(skb, OVS_KEY_ATTR_ETHERTYPE, output->eth.type))
1682 goto nla_put_failure;
1684 if (swkey->eth.type == htons(ETH_P_IP)) {
1685 struct ovs_key_ipv4 *ipv4_key;
1687 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV4, sizeof(*ipv4_key));
1689 goto nla_put_failure;
1690 ipv4_key = nla_data(nla);
1691 ipv4_key->ipv4_src = output->ipv4.addr.src;
1692 ipv4_key->ipv4_dst = output->ipv4.addr.dst;
1693 ipv4_key->ipv4_proto = output->ip.proto;
1694 ipv4_key->ipv4_tos = output->ip.tos;
1695 ipv4_key->ipv4_ttl = output->ip.ttl;
1696 ipv4_key->ipv4_frag = output->ip.frag;
1697 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1698 struct ovs_key_ipv6 *ipv6_key;
1700 nla = nla_reserve(skb, OVS_KEY_ATTR_IPV6, sizeof(*ipv6_key));
1702 goto nla_put_failure;
1703 ipv6_key = nla_data(nla);
1704 memcpy(ipv6_key->ipv6_src, &output->ipv6.addr.src,
1705 sizeof(ipv6_key->ipv6_src));
1706 memcpy(ipv6_key->ipv6_dst, &output->ipv6.addr.dst,
1707 sizeof(ipv6_key->ipv6_dst));
1708 ipv6_key->ipv6_label = output->ipv6.label;
1709 ipv6_key->ipv6_proto = output->ip.proto;
1710 ipv6_key->ipv6_tclass = output->ip.tos;
1711 ipv6_key->ipv6_hlimit = output->ip.ttl;
1712 ipv6_key->ipv6_frag = output->ip.frag;
1713 } else if (swkey->eth.type == htons(ETH_P_ARP) ||
1714 swkey->eth.type == htons(ETH_P_RARP)) {
1715 struct ovs_key_arp *arp_key;
1717 nla = nla_reserve(skb, OVS_KEY_ATTR_ARP, sizeof(*arp_key));
1719 goto nla_put_failure;
1720 arp_key = nla_data(nla);
1721 memset(arp_key, 0, sizeof(struct ovs_key_arp));
1722 arp_key->arp_sip = output->ipv4.addr.src;
1723 arp_key->arp_tip = output->ipv4.addr.dst;
1724 arp_key->arp_op = htons(output->ip.proto);
1725 memcpy(arp_key->arp_sha, output->ipv4.arp.sha, ETH_ALEN);
1726 memcpy(arp_key->arp_tha, output->ipv4.arp.tha, ETH_ALEN);
1729 if ((swkey->eth.type == htons(ETH_P_IP) ||
1730 swkey->eth.type == htons(ETH_P_IPV6)) &&
1731 swkey->ip.frag != OVS_FRAG_TYPE_LATER) {
1733 if (swkey->ip.proto == IPPROTO_TCP) {
1734 struct ovs_key_tcp *tcp_key;
1736 nla = nla_reserve(skb, OVS_KEY_ATTR_TCP, sizeof(*tcp_key));
1738 goto nla_put_failure;
1739 tcp_key = nla_data(nla);
1740 if (swkey->eth.type == htons(ETH_P_IP)) {
1741 tcp_key->tcp_src = output->ipv4.tp.src;
1742 tcp_key->tcp_dst = output->ipv4.tp.dst;
1743 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1744 tcp_key->tcp_src = output->ipv6.tp.src;
1745 tcp_key->tcp_dst = output->ipv6.tp.dst;
1747 } else if (swkey->ip.proto == IPPROTO_UDP) {
1748 struct ovs_key_udp *udp_key;
1750 nla = nla_reserve(skb, OVS_KEY_ATTR_UDP, sizeof(*udp_key));
1752 goto nla_put_failure;
1753 udp_key = nla_data(nla);
1754 if (swkey->eth.type == htons(ETH_P_IP)) {
1755 udp_key->udp_src = output->ipv4.tp.src;
1756 udp_key->udp_dst = output->ipv4.tp.dst;
1757 } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
1758 udp_key->udp_src = output->ipv6.tp.src;
1759 udp_key->udp_dst = output->ipv6.tp.dst;
1761 } else if (swkey->eth.type == htons(ETH_P_IP) &&
1762 swkey->ip.proto == IPPROTO_ICMP) {
1763 struct ovs_key_icmp *icmp_key;
1765 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMP, sizeof(*icmp_key));
1767 goto nla_put_failure;
1768 icmp_key = nla_data(nla);
1769 icmp_key->icmp_type = ntohs(output->ipv4.tp.src);
1770 icmp_key->icmp_code = ntohs(output->ipv4.tp.dst);
1771 } else if (swkey->eth.type == htons(ETH_P_IPV6) &&
1772 swkey->ip.proto == IPPROTO_ICMPV6) {
1773 struct ovs_key_icmpv6 *icmpv6_key;
1775 nla = nla_reserve(skb, OVS_KEY_ATTR_ICMPV6,
1776 sizeof(*icmpv6_key));
1778 goto nla_put_failure;
1779 icmpv6_key = nla_data(nla);
1780 icmpv6_key->icmpv6_type = ntohs(output->ipv6.tp.src);
1781 icmpv6_key->icmpv6_code = ntohs(output->ipv6.tp.dst);
1783 if (icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_SOLICITATION ||
1784 icmpv6_key->icmpv6_type == NDISC_NEIGHBOUR_ADVERTISEMENT) {
1785 struct ovs_key_nd *nd_key;
1787 nla = nla_reserve(skb, OVS_KEY_ATTR_ND, sizeof(*nd_key));
1789 goto nla_put_failure;
1790 nd_key = nla_data(nla);
1791 memcpy(nd_key->nd_target, &output->ipv6.nd.target,
1792 sizeof(nd_key->nd_target));
1793 memcpy(nd_key->nd_sll, output->ipv6.nd.sll, ETH_ALEN);
1794 memcpy(nd_key->nd_tll, output->ipv6.nd.tll, ETH_ALEN);
1801 nla_nest_end(skb, encap);
1809 /* Initializes the flow module.
1810 * Returns zero if successful or a negative error code. */
1811 int ovs_flow_init(void)
1813 flow_cache = kmem_cache_create("sw_flow", sizeof(struct sw_flow), 0,
1815 if (flow_cache == NULL)
1821 /* Uninitializes the flow module. */
1822 void ovs_flow_exit(void)
1824 kmem_cache_destroy(flow_cache);
1827 struct sw_flow_mask *ovs_sw_flow_mask_alloc(void)
1829 struct sw_flow_mask *mask;
1831 mask = kmalloc(sizeof(*mask), GFP_KERNEL);
1833 mask->ref_count = 0;
1838 void ovs_sw_flow_mask_add_ref(struct sw_flow_mask *mask)
1843 static void rcu_free_sw_flow_mask_cb(struct rcu_head *rcu)
1845 struct sw_flow_mask *mask = container_of(rcu, struct sw_flow_mask, rcu);
1850 void ovs_sw_flow_mask_del_ref(struct sw_flow_mask *mask, bool deferred)
1855 BUG_ON(!mask->ref_count);
1858 if (!mask->ref_count) {
1859 list_del_rcu(&mask->list);
1861 call_rcu(&mask->rcu, rcu_free_sw_flow_mask_cb);
1867 static bool ovs_sw_flow_mask_equal(const struct sw_flow_mask *a,
1868 const struct sw_flow_mask *b)
1870 u8 *a_ = (u8 *)&a->key + a->range.start;
1871 u8 *b_ = (u8 *)&b->key + b->range.start;
1873 return (a->range.end == b->range.end)
1874 && (a->range.start == b->range.start)
1875 && (memcmp(a_, b_, ovs_sw_flow_mask_actual_size(a)) == 0);
1878 struct sw_flow_mask *ovs_sw_flow_mask_find(const struct flow_table *tbl,
1879 const struct sw_flow_mask *mask)
1881 struct list_head *ml;
1883 list_for_each(ml, tbl->mask_list) {
1884 struct sw_flow_mask *m;
1885 m = container_of(ml, struct sw_flow_mask, list);
1886 if (ovs_sw_flow_mask_equal(mask, m))
1894 * add a new mask into the mask list.
1895 * The caller needs to make sure that 'mask' is not the same
1896 * as any masks that are already on the list.
1898 void ovs_sw_flow_mask_insert(struct flow_table *tbl, struct sw_flow_mask *mask)
1900 list_add_rcu(&mask->list, tbl->mask_list);
1904 * Set 'range' fields in the mask to the value of 'val'.
1906 static void ovs_sw_flow_mask_set(struct sw_flow_mask *mask,
1907 struct sw_flow_key_range *range, u8 val)
1909 u8 *m = (u8 *)&mask->key + range->start;
1911 mask->range = *range;
1912 memset(m, val, ovs_sw_flow_mask_size_roundup(mask));