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/sctp.h>
38 #include <linux/smp.h>
39 #include <linux/tcp.h>
40 #include <linux/udp.h>
41 #include <linux/icmp.h>
42 #include <linux/icmpv6.h>
43 #include <linux/rculist.h>
46 #include <net/ndisc.h>
50 u64 ovs_flow_used_time(unsigned long flow_jiffies)
52 struct timespec cur_ts;
55 ktime_get_ts(&cur_ts);
56 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
57 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
58 cur_ts.tv_nsec / NSEC_PER_MSEC;
60 return cur_ms - idle_ms;
63 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
65 void ovs_flow_stats_update(struct sw_flow *flow, struct sk_buff *skb)
67 struct flow_stats *stats;
69 int node = numa_node_id();
71 stats = rcu_dereference(flow->stats[node]);
73 if ((flow->key.eth.type == htons(ETH_P_IP) ||
74 flow->key.eth.type == htons(ETH_P_IPV6)) &&
75 flow->key.ip.frag != OVS_FRAG_TYPE_LATER &&
76 flow->key.ip.proto == IPPROTO_TCP &&
77 likely(skb->len >= skb_transport_offset(skb) + sizeof(struct tcphdr))) {
78 tcp_flags = TCP_FLAGS_BE16(tcp_hdr(skb));
81 /* Check if already have node-specific stats. */
83 spin_lock(&stats->lock);
84 /* Mark if we write on the pre-allocated stats. */
85 if (node == 0 && unlikely(flow->stats_last_writer != node))
86 flow->stats_last_writer = node;
88 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
89 spin_lock(&stats->lock);
91 /* If the current NUMA-node is the only writer on the
92 * pre-allocated stats keep using them.
94 if (unlikely(flow->stats_last_writer != node)) {
95 /* A previous locker may have already allocated the
96 * stats, so we need to check again. If node-specific
97 * stats were already allocated, we update the pre-
98 * allocated stats as we have already locked them.
100 if (likely(flow->stats_last_writer != NUMA_NO_NODE)
101 && likely(!rcu_dereference(flow->stats[node]))) {
102 /* Try to allocate node-specific stats. */
103 struct flow_stats *new_stats;
106 kmem_cache_alloc_node(flow_stats_cache,
110 if (likely(new_stats)) {
111 new_stats->used = jiffies;
112 new_stats->packet_count = 1;
113 new_stats->byte_count = skb->len;
114 new_stats->tcp_flags = tcp_flags;
115 spin_lock_init(&new_stats->lock);
117 rcu_assign_pointer(flow->stats[node],
122 flow->stats_last_writer = node;
126 stats->used = jiffies;
127 stats->packet_count++;
128 stats->byte_count += skb->len;
129 stats->tcp_flags |= tcp_flags;
131 spin_unlock(&stats->lock);
134 void ovs_flow_stats_get(struct sw_flow *flow, struct ovs_flow_stats *ovs_stats,
135 unsigned long *used, __be16 *tcp_flags)
141 memset(ovs_stats, 0, sizeof(*ovs_stats));
143 for_each_node(node) {
144 struct flow_stats *stats = rcu_dereference(flow->stats[node]);
147 /* Local CPU may write on non-local stats, so we must
148 * block bottom-halves here.
150 spin_lock_bh(&stats->lock);
151 if (time_after(stats->used, *used))
153 *tcp_flags |= stats->tcp_flags;
154 ovs_stats->n_packets += stats->packet_count;
155 ovs_stats->n_bytes += stats->byte_count;
156 spin_unlock_bh(&stats->lock);
161 void ovs_flow_stats_clear(struct sw_flow *flow)
165 for_each_node(node) {
166 struct flow_stats *stats = rcu_dereference(flow->stats[node]);
169 spin_lock_bh(&stats->lock);
171 stats->packet_count = 0;
172 stats->byte_count = 0;
173 stats->tcp_flags = 0;
174 spin_unlock_bh(&stats->lock);
179 static int check_header(struct sk_buff *skb, int len)
181 if (unlikely(skb->len < len))
183 if (unlikely(!pskb_may_pull(skb, len)))
188 static bool arphdr_ok(struct sk_buff *skb)
190 return pskb_may_pull(skb, skb_network_offset(skb) +
191 sizeof(struct arp_eth_header));
194 static int check_iphdr(struct sk_buff *skb)
196 unsigned int nh_ofs = skb_network_offset(skb);
200 err = check_header(skb, nh_ofs + sizeof(struct iphdr));
204 ip_len = ip_hdrlen(skb);
205 if (unlikely(ip_len < sizeof(struct iphdr) ||
206 skb->len < nh_ofs + ip_len))
209 skb_set_transport_header(skb, nh_ofs + ip_len);
213 static bool tcphdr_ok(struct sk_buff *skb)
215 int th_ofs = skb_transport_offset(skb);
218 if (unlikely(!pskb_may_pull(skb, th_ofs + sizeof(struct tcphdr))))
221 tcp_len = tcp_hdrlen(skb);
222 if (unlikely(tcp_len < sizeof(struct tcphdr) ||
223 skb->len < th_ofs + tcp_len))
229 static bool udphdr_ok(struct sk_buff *skb)
231 return pskb_may_pull(skb, skb_transport_offset(skb) +
232 sizeof(struct udphdr));
235 static bool sctphdr_ok(struct sk_buff *skb)
237 return pskb_may_pull(skb, skb_transport_offset(skb) +
238 sizeof(struct sctphdr));
241 static bool icmphdr_ok(struct sk_buff *skb)
243 return pskb_may_pull(skb, skb_transport_offset(skb) +
244 sizeof(struct icmphdr));
247 static int parse_ipv6hdr(struct sk_buff *skb, struct sw_flow_key *key)
249 unsigned int nh_ofs = skb_network_offset(skb);
257 err = check_header(skb, nh_ofs + sizeof(*nh));
262 nexthdr = nh->nexthdr;
263 payload_ofs = (u8 *)(nh + 1) - skb->data;
265 key->ip.proto = NEXTHDR_NONE;
266 key->ip.tos = ipv6_get_dsfield(nh);
267 key->ip.ttl = nh->hop_limit;
268 key->ipv6.label = *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
269 key->ipv6.addr.src = nh->saddr;
270 key->ipv6.addr.dst = nh->daddr;
272 payload_ofs = ipv6_skip_exthdr(skb, payload_ofs, &nexthdr, &frag_off);
273 if (unlikely(payload_ofs < 0))
277 if (frag_off & htons(~0x7))
278 key->ip.frag = OVS_FRAG_TYPE_LATER;
280 key->ip.frag = OVS_FRAG_TYPE_FIRST;
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));
295 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
298 __be16 eth_type; /* ETH_P_8021Q */
301 struct qtag_prefix *qp;
303 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
306 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
310 qp = (struct qtag_prefix *) skb->data;
311 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
312 __skb_pull(skb, sizeof(struct qtag_prefix));
317 static __be16 parse_ethertype(struct sk_buff *skb)
319 struct llc_snap_hdr {
320 u8 dsap; /* Always 0xAA */
321 u8 ssap; /* Always 0xAA */
326 struct llc_snap_hdr *llc;
329 proto = *(__be16 *) skb->data;
330 __skb_pull(skb, sizeof(__be16));
332 if (ntohs(proto) >= ETH_P_802_3_MIN)
335 if (skb->len < sizeof(struct llc_snap_hdr))
336 return htons(ETH_P_802_2);
338 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
341 llc = (struct llc_snap_hdr *) skb->data;
342 if (llc->dsap != LLC_SAP_SNAP ||
343 llc->ssap != LLC_SAP_SNAP ||
344 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
345 return htons(ETH_P_802_2);
347 __skb_pull(skb, sizeof(struct llc_snap_hdr));
349 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
350 return llc->ethertype;
352 return htons(ETH_P_802_2);
355 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
358 struct icmp6hdr *icmp = icmp6_hdr(skb);
360 /* The ICMPv6 type and code fields use the 16-bit transport port
361 * fields, so we need to store them in 16-bit network byte order.
363 key->ipv6.tp.src = htons(icmp->icmp6_type);
364 key->ipv6.tp.dst = htons(icmp->icmp6_code);
366 if (icmp->icmp6_code == 0 &&
367 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
368 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
369 int icmp_len = skb->len - skb_transport_offset(skb);
373 /* In order to process neighbor discovery options, we need the
376 if (unlikely(icmp_len < sizeof(*nd)))
379 if (unlikely(skb_linearize(skb)))
382 nd = (struct nd_msg *)skb_transport_header(skb);
383 key->ipv6.nd.target = nd->target;
385 icmp_len -= sizeof(*nd);
387 while (icmp_len >= 8) {
388 struct nd_opt_hdr *nd_opt =
389 (struct nd_opt_hdr *)(nd->opt + offset);
390 int opt_len = nd_opt->nd_opt_len * 8;
392 if (unlikely(!opt_len || opt_len > icmp_len))
395 /* Store the link layer address if the appropriate
396 * option is provided. It is considered an error if
397 * the same link layer option is specified twice.
399 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
401 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
403 ether_addr_copy(key->ipv6.nd.sll,
404 &nd->opt[offset+sizeof(*nd_opt)]);
405 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
407 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
409 ether_addr_copy(key->ipv6.nd.tll,
410 &nd->opt[offset+sizeof(*nd_opt)]);
421 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
422 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
423 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
429 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
430 * @skb: sk_buff that contains the frame, with skb->data pointing to the
432 * @in_port: port number on which @skb was received.
433 * @key: output flow key
435 * The caller must ensure that skb->len >= ETH_HLEN.
437 * Returns 0 if successful, otherwise a negative errno value.
439 * Initializes @skb header pointers as follows:
441 * - skb->mac_header: the Ethernet header.
443 * - skb->network_header: just past the Ethernet header, or just past the
444 * VLAN header, to the first byte of the Ethernet payload.
446 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
447 * on output, then just past the IP header, if one is present and
448 * of a correct length, otherwise the same as skb->network_header.
449 * For other key->eth.type values it is left untouched.
451 int ovs_flow_extract(struct sk_buff *skb, u16 in_port, struct sw_flow_key *key)
456 memset(key, 0, sizeof(*key));
458 key->phy.priority = skb->priority;
459 if (OVS_CB(skb)->tun_key)
460 memcpy(&key->tun_key, OVS_CB(skb)->tun_key, sizeof(key->tun_key));
461 key->phy.in_port = in_port;
462 key->phy.skb_mark = skb->mark;
464 skb_reset_mac_header(skb);
466 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
467 * header in the linear data area.
470 ether_addr_copy(key->eth.src, eth->h_source);
471 ether_addr_copy(key->eth.dst, eth->h_dest);
473 __skb_pull(skb, 2 * ETH_ALEN);
474 /* We are going to push all headers that we pull, so no need to
475 * update skb->csum here. */
477 if (vlan_tx_tag_present(skb))
478 key->eth.tci = htons(vlan_get_tci(skb));
479 else if (eth->h_proto == htons(ETH_P_8021Q))
480 if (unlikely(parse_vlan(skb, key)))
483 key->eth.type = parse_ethertype(skb);
484 if (unlikely(key->eth.type == htons(0)))
487 skb_reset_network_header(skb);
488 __skb_push(skb, skb->data - skb_mac_header(skb));
491 if (key->eth.type == htons(ETH_P_IP)) {
495 error = check_iphdr(skb);
496 if (unlikely(error)) {
497 if (error == -EINVAL) {
498 skb->transport_header = skb->network_header;
505 key->ipv4.addr.src = nh->saddr;
506 key->ipv4.addr.dst = nh->daddr;
508 key->ip.proto = nh->protocol;
509 key->ip.tos = nh->tos;
510 key->ip.ttl = nh->ttl;
512 offset = nh->frag_off & htons(IP_OFFSET);
514 key->ip.frag = OVS_FRAG_TYPE_LATER;
517 if (nh->frag_off & htons(IP_MF) ||
518 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
519 key->ip.frag = OVS_FRAG_TYPE_FIRST;
521 /* Transport layer. */
522 if (key->ip.proto == IPPROTO_TCP) {
523 if (tcphdr_ok(skb)) {
524 struct tcphdr *tcp = tcp_hdr(skb);
525 key->ipv4.tp.src = tcp->source;
526 key->ipv4.tp.dst = tcp->dest;
527 key->ipv4.tp.flags = TCP_FLAGS_BE16(tcp);
529 } else if (key->ip.proto == IPPROTO_UDP) {
530 if (udphdr_ok(skb)) {
531 struct udphdr *udp = udp_hdr(skb);
532 key->ipv4.tp.src = udp->source;
533 key->ipv4.tp.dst = udp->dest;
535 } else if (key->ip.proto == IPPROTO_SCTP) {
536 if (sctphdr_ok(skb)) {
537 struct sctphdr *sctp = sctp_hdr(skb);
538 key->ipv4.tp.src = sctp->source;
539 key->ipv4.tp.dst = sctp->dest;
541 } else if (key->ip.proto == IPPROTO_ICMP) {
542 if (icmphdr_ok(skb)) {
543 struct icmphdr *icmp = icmp_hdr(skb);
544 /* The ICMP type and code fields use the 16-bit
545 * transport port fields, so we need to store
546 * them in 16-bit network byte order. */
547 key->ipv4.tp.src = htons(icmp->type);
548 key->ipv4.tp.dst = htons(icmp->code);
552 } else if ((key->eth.type == htons(ETH_P_ARP) ||
553 key->eth.type == htons(ETH_P_RARP)) && arphdr_ok(skb)) {
554 struct arp_eth_header *arp;
556 arp = (struct arp_eth_header *)skb_network_header(skb);
558 if (arp->ar_hrd == htons(ARPHRD_ETHER)
559 && arp->ar_pro == htons(ETH_P_IP)
560 && arp->ar_hln == ETH_ALEN
561 && arp->ar_pln == 4) {
563 /* We only match on the lower 8 bits of the opcode. */
564 if (ntohs(arp->ar_op) <= 0xff)
565 key->ip.proto = ntohs(arp->ar_op);
566 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
567 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
568 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
569 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
571 } else if (key->eth.type == htons(ETH_P_IPV6)) {
572 int nh_len; /* IPv6 Header + Extensions */
574 nh_len = parse_ipv6hdr(skb, key);
575 if (unlikely(nh_len < 0)) {
576 if (nh_len == -EINVAL) {
577 skb->transport_header = skb->network_header;
585 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
587 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
588 key->ip.frag = OVS_FRAG_TYPE_FIRST;
590 /* Transport layer. */
591 if (key->ip.proto == NEXTHDR_TCP) {
592 if (tcphdr_ok(skb)) {
593 struct tcphdr *tcp = tcp_hdr(skb);
594 key->ipv6.tp.src = tcp->source;
595 key->ipv6.tp.dst = tcp->dest;
596 key->ipv6.tp.flags = TCP_FLAGS_BE16(tcp);
598 } else if (key->ip.proto == NEXTHDR_UDP) {
599 if (udphdr_ok(skb)) {
600 struct udphdr *udp = udp_hdr(skb);
601 key->ipv6.tp.src = udp->source;
602 key->ipv6.tp.dst = udp->dest;
604 } else if (key->ip.proto == NEXTHDR_SCTP) {
605 if (sctphdr_ok(skb)) {
606 struct sctphdr *sctp = sctp_hdr(skb);
607 key->ipv6.tp.src = sctp->source;
608 key->ipv6.tp.dst = sctp->dest;
610 } else if (key->ip.proto == NEXTHDR_ICMP) {
611 if (icmp6hdr_ok(skb)) {
612 error = parse_icmpv6(skb, key, nh_len);