2 * Copyright (c) 2007-2014 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
19 #include <linux/uaccess.h>
20 #include <linux/netdevice.h>
21 #include <linux/etherdevice.h>
22 #include <linux/if_ether.h>
23 #include <linux/if_vlan.h>
24 #include <net/llc_pdu.h>
25 #include <linux/kernel.h>
26 #include <linux/jhash.h>
27 #include <linux/jiffies.h>
28 #include <linux/llc.h>
29 #include <linux/module.h>
31 #include <linux/rcupdate.h>
32 #include <linux/if_arp.h>
34 #include <linux/ipv6.h>
35 #include <linux/mpls.h>
36 #include <linux/sctp.h>
37 #include <linux/smp.h>
38 #include <linux/tcp.h>
39 #include <linux/udp.h>
40 #include <linux/icmp.h>
41 #include <linux/icmpv6.h>
42 #include <linux/rculist.h>
46 #include <net/ndisc.h>
50 #include "flow_netlink.h"
54 u64 ovs_flow_used_time(unsigned long flow_jiffies)
56 struct timespec cur_ts;
59 ktime_get_ts(&cur_ts);
60 idle_ms = jiffies_to_msecs(jiffies - flow_jiffies);
61 cur_ms = (u64)cur_ts.tv_sec * MSEC_PER_SEC +
62 cur_ts.tv_nsec / NSEC_PER_MSEC;
64 return cur_ms - idle_ms;
67 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
69 void ovs_flow_stats_update(struct sw_flow *flow, __be16 tcp_flags,
70 const struct sk_buff *skb)
72 struct flow_stats *stats;
73 int node = numa_node_id();
74 int len = skb->len + (skb_vlan_tag_present(skb) ? VLAN_HLEN : 0);
76 stats = rcu_dereference(flow->stats[node]);
78 /* Check if already have node-specific stats. */
80 spin_lock(&stats->lock);
81 /* Mark if we write on the pre-allocated stats. */
82 if (node == 0 && unlikely(flow->stats_last_writer != node))
83 flow->stats_last_writer = node;
85 stats = rcu_dereference(flow->stats[0]); /* Pre-allocated. */
86 spin_lock(&stats->lock);
88 /* If the current NUMA-node is the only writer on the
89 * pre-allocated stats keep using them.
91 if (unlikely(flow->stats_last_writer != node)) {
92 /* A previous locker may have already allocated the
93 * stats, so we need to check again. If node-specific
94 * stats were already allocated, we update the pre-
95 * allocated stats as we have already locked them.
97 if (likely(flow->stats_last_writer != NUMA_NO_NODE)
98 && likely(!rcu_access_pointer(flow->stats[node]))) {
99 /* Try to allocate node-specific stats. */
100 struct flow_stats *new_stats;
103 kmem_cache_alloc_node(flow_stats_cache,
107 if (likely(new_stats)) {
108 new_stats->used = jiffies;
109 new_stats->packet_count = 1;
110 new_stats->byte_count = len;
111 new_stats->tcp_flags = tcp_flags;
112 spin_lock_init(&new_stats->lock);
114 rcu_assign_pointer(flow->stats[node],
119 flow->stats_last_writer = node;
123 stats->used = jiffies;
124 stats->packet_count++;
125 stats->byte_count += len;
126 stats->tcp_flags |= tcp_flags;
128 spin_unlock(&stats->lock);
131 /* Must be called with rcu_read_lock or ovs_mutex. */
132 void ovs_flow_stats_get(const struct sw_flow *flow,
133 struct ovs_flow_stats *ovs_stats,
134 unsigned long *used, __be16 *tcp_flags)
140 memset(ovs_stats, 0, sizeof(*ovs_stats));
142 for_each_node(node) {
143 struct flow_stats *stats = rcu_dereference_ovsl(flow->stats[node]);
146 /* Local CPU may write on non-local stats, so we must
147 * block bottom-halves here.
149 spin_lock_bh(&stats->lock);
150 if (!*used || time_after(stats->used, *used))
152 *tcp_flags |= stats->tcp_flags;
153 ovs_stats->n_packets += stats->packet_count;
154 ovs_stats->n_bytes += stats->byte_count;
155 spin_unlock_bh(&stats->lock);
160 /* Called with ovs_mutex. */
161 void ovs_flow_stats_clear(struct sw_flow *flow)
165 for_each_node(node) {
166 struct flow_stats *stats = ovsl_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;
282 key->ip.frag = OVS_FRAG_TYPE_NONE;
285 nh_len = payload_ofs - nh_ofs;
286 skb_set_transport_header(skb, nh_ofs + nh_len);
287 key->ip.proto = nexthdr;
291 static bool icmp6hdr_ok(struct sk_buff *skb)
293 return pskb_may_pull(skb, skb_transport_offset(skb) +
294 sizeof(struct icmp6hdr));
297 static int parse_vlan(struct sk_buff *skb, struct sw_flow_key *key)
300 __be16 eth_type; /* ETH_P_8021Q */
303 struct qtag_prefix *qp;
305 if (unlikely(skb->len < sizeof(struct qtag_prefix) + sizeof(__be16)))
308 if (unlikely(!pskb_may_pull(skb, sizeof(struct qtag_prefix) +
312 qp = (struct qtag_prefix *) skb->data;
313 key->eth.tci = qp->tci | htons(VLAN_TAG_PRESENT);
314 __skb_pull(skb, sizeof(struct qtag_prefix));
319 static __be16 parse_ethertype(struct sk_buff *skb)
321 struct llc_snap_hdr {
322 u8 dsap; /* Always 0xAA */
323 u8 ssap; /* Always 0xAA */
328 struct llc_snap_hdr *llc;
331 proto = *(__be16 *) skb->data;
332 __skb_pull(skb, sizeof(__be16));
334 if (ntohs(proto) >= ETH_P_802_3_MIN)
337 if (skb->len < sizeof(struct llc_snap_hdr))
338 return htons(ETH_P_802_2);
340 if (unlikely(!pskb_may_pull(skb, sizeof(struct llc_snap_hdr))))
343 llc = (struct llc_snap_hdr *) skb->data;
344 if (llc->dsap != LLC_SAP_SNAP ||
345 llc->ssap != LLC_SAP_SNAP ||
346 (llc->oui[0] | llc->oui[1] | llc->oui[2]) != 0)
347 return htons(ETH_P_802_2);
349 __skb_pull(skb, sizeof(struct llc_snap_hdr));
351 if (ntohs(llc->ethertype) >= ETH_P_802_3_MIN)
352 return llc->ethertype;
354 return htons(ETH_P_802_2);
357 static int parse_icmpv6(struct sk_buff *skb, struct sw_flow_key *key,
360 struct icmp6hdr *icmp = icmp6_hdr(skb);
362 /* The ICMPv6 type and code fields use the 16-bit transport port
363 * fields, so we need to store them in 16-bit network byte order.
365 key->tp.src = htons(icmp->icmp6_type);
366 key->tp.dst = htons(icmp->icmp6_code);
367 memset(&key->ipv6.nd, 0, sizeof(key->ipv6.nd));
369 if (icmp->icmp6_code == 0 &&
370 (icmp->icmp6_type == NDISC_NEIGHBOUR_SOLICITATION ||
371 icmp->icmp6_type == NDISC_NEIGHBOUR_ADVERTISEMENT)) {
372 int icmp_len = skb->len - skb_transport_offset(skb);
376 /* In order to process neighbor discovery options, we need the
379 if (unlikely(icmp_len < sizeof(*nd)))
382 if (unlikely(skb_linearize(skb)))
385 nd = (struct nd_msg *)skb_transport_header(skb);
386 key->ipv6.nd.target = nd->target;
388 icmp_len -= sizeof(*nd);
390 while (icmp_len >= 8) {
391 struct nd_opt_hdr *nd_opt =
392 (struct nd_opt_hdr *)(nd->opt + offset);
393 int opt_len = nd_opt->nd_opt_len * 8;
395 if (unlikely(!opt_len || opt_len > icmp_len))
398 /* Store the link layer address if the appropriate
399 * option is provided. It is considered an error if
400 * the same link layer option is specified twice.
402 if (nd_opt->nd_opt_type == ND_OPT_SOURCE_LL_ADDR
404 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.sll)))
406 ether_addr_copy(key->ipv6.nd.sll,
407 &nd->opt[offset+sizeof(*nd_opt)]);
408 } else if (nd_opt->nd_opt_type == ND_OPT_TARGET_LL_ADDR
410 if (unlikely(!is_zero_ether_addr(key->ipv6.nd.tll)))
412 ether_addr_copy(key->ipv6.nd.tll,
413 &nd->opt[offset+sizeof(*nd_opt)]);
424 memset(&key->ipv6.nd.target, 0, sizeof(key->ipv6.nd.target));
425 memset(key->ipv6.nd.sll, 0, sizeof(key->ipv6.nd.sll));
426 memset(key->ipv6.nd.tll, 0, sizeof(key->ipv6.nd.tll));
432 * key_extract - extracts a flow key from an Ethernet frame.
433 * @skb: sk_buff that contains the frame, with skb->data pointing to the
435 * @key: output flow key
437 * The caller must ensure that skb->len >= ETH_HLEN.
439 * Returns 0 if successful, otherwise a negative errno value.
441 * Initializes @skb header pointers as follows:
443 * - skb->mac_header: the Ethernet header.
445 * - skb->network_header: just past the Ethernet header, or just past the
446 * VLAN header, to the first byte of the Ethernet payload.
448 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
449 * on output, then just past the IP header, if one is present and
450 * of a correct length, otherwise the same as skb->network_header.
451 * For other key->eth.type values it is left untouched.
453 static int key_extract(struct sk_buff *skb, struct sw_flow_key *key)
458 /* Flags are always used as part of stats */
461 skb_reset_mac_header(skb);
463 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
464 * header in the linear data area.
467 ether_addr_copy(key->eth.src, eth->h_source);
468 ether_addr_copy(key->eth.dst, eth->h_dest);
470 __skb_pull(skb, 2 * ETH_ALEN);
471 /* We are going to push all headers that we pull, so no need to
472 * update skb->csum here.
476 if (skb_vlan_tag_present(skb))
477 key->eth.tci = htons(vlan_get_tci(skb));
478 else if (eth->h_proto == htons(ETH_P_8021Q))
479 if (unlikely(parse_vlan(skb, key)))
482 key->eth.type = parse_ethertype(skb);
483 if (unlikely(key->eth.type == htons(0)))
486 skb_reset_network_header(skb);
487 skb_reset_mac_len(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 memset(&key->ip, 0, sizeof(key->ip));
498 memset(&key->ipv4, 0, sizeof(key->ipv4));
499 if (error == -EINVAL) {
500 skb->transport_header = skb->network_header;
507 key->ipv4.addr.src = nh->saddr;
508 key->ipv4.addr.dst = nh->daddr;
510 key->ip.proto = nh->protocol;
511 key->ip.tos = nh->tos;
512 key->ip.ttl = nh->ttl;
514 offset = nh->frag_off & htons(IP_OFFSET);
516 key->ip.frag = OVS_FRAG_TYPE_LATER;
519 if (nh->frag_off & htons(IP_MF) ||
520 skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
521 key->ip.frag = OVS_FRAG_TYPE_FIRST;
523 key->ip.frag = OVS_FRAG_TYPE_NONE;
525 /* Transport layer. */
526 if (key->ip.proto == IPPROTO_TCP) {
527 if (tcphdr_ok(skb)) {
528 struct tcphdr *tcp = tcp_hdr(skb);
529 key->tp.src = tcp->source;
530 key->tp.dst = tcp->dest;
531 key->tp.flags = TCP_FLAGS_BE16(tcp);
533 memset(&key->tp, 0, sizeof(key->tp));
536 } else if (key->ip.proto == IPPROTO_UDP) {
537 if (udphdr_ok(skb)) {
538 struct udphdr *udp = udp_hdr(skb);
539 key->tp.src = udp->source;
540 key->tp.dst = udp->dest;
542 memset(&key->tp, 0, sizeof(key->tp));
544 } else if (key->ip.proto == IPPROTO_SCTP) {
545 if (sctphdr_ok(skb)) {
546 struct sctphdr *sctp = sctp_hdr(skb);
547 key->tp.src = sctp->source;
548 key->tp.dst = sctp->dest;
550 memset(&key->tp, 0, sizeof(key->tp));
552 } else if (key->ip.proto == IPPROTO_ICMP) {
553 if (icmphdr_ok(skb)) {
554 struct icmphdr *icmp = icmp_hdr(skb);
555 /* The ICMP type and code fields use the 16-bit
556 * transport port fields, so we need to store
557 * them in 16-bit network byte order.
559 key->tp.src = htons(icmp->type);
560 key->tp.dst = htons(icmp->code);
562 memset(&key->tp, 0, sizeof(key->tp));
566 } else if (key->eth.type == htons(ETH_P_ARP) ||
567 key->eth.type == htons(ETH_P_RARP)) {
568 struct arp_eth_header *arp;
569 bool arp_available = arphdr_ok(skb);
571 arp = (struct arp_eth_header *)skb_network_header(skb);
574 arp->ar_hrd == htons(ARPHRD_ETHER) &&
575 arp->ar_pro == htons(ETH_P_IP) &&
576 arp->ar_hln == ETH_ALEN &&
579 /* We only match on the lower 8 bits of the opcode. */
580 if (ntohs(arp->ar_op) <= 0xff)
581 key->ip.proto = ntohs(arp->ar_op);
585 memcpy(&key->ipv4.addr.src, arp->ar_sip, sizeof(key->ipv4.addr.src));
586 memcpy(&key->ipv4.addr.dst, arp->ar_tip, sizeof(key->ipv4.addr.dst));
587 ether_addr_copy(key->ipv4.arp.sha, arp->ar_sha);
588 ether_addr_copy(key->ipv4.arp.tha, arp->ar_tha);
590 memset(&key->ip, 0, sizeof(key->ip));
591 memset(&key->ipv4, 0, sizeof(key->ipv4));
593 } else if (eth_p_mpls(key->eth.type)) {
594 size_t stack_len = MPLS_HLEN;
596 /* In the presence of an MPLS label stack the end of the L2
597 * header and the beginning of the L3 header differ.
599 * Advance network_header to the beginning of the L3
600 * header. mac_len corresponds to the end of the L2 header.
605 error = check_header(skb, skb->mac_len + stack_len);
609 memcpy(&lse, skb_network_header(skb), MPLS_HLEN);
611 if (stack_len == MPLS_HLEN)
612 memcpy(&key->mpls.top_lse, &lse, MPLS_HLEN);
614 skb_set_network_header(skb, skb->mac_len + stack_len);
615 if (lse & htonl(MPLS_LS_S_MASK))
618 stack_len += MPLS_HLEN;
620 } else if (key->eth.type == htons(ETH_P_IPV6)) {
621 int nh_len; /* IPv6 Header + Extensions */
623 nh_len = parse_ipv6hdr(skb, key);
624 if (unlikely(nh_len < 0)) {
625 memset(&key->ip, 0, sizeof(key->ip));
626 memset(&key->ipv6.addr, 0, sizeof(key->ipv6.addr));
627 if (nh_len == -EINVAL) {
628 skb->transport_header = skb->network_header;
636 if (key->ip.frag == OVS_FRAG_TYPE_LATER)
638 if (skb_shinfo(skb)->gso_type & SKB_GSO_UDP)
639 key->ip.frag = OVS_FRAG_TYPE_FIRST;
641 /* Transport layer. */
642 if (key->ip.proto == NEXTHDR_TCP) {
643 if (tcphdr_ok(skb)) {
644 struct tcphdr *tcp = tcp_hdr(skb);
645 key->tp.src = tcp->source;
646 key->tp.dst = tcp->dest;
647 key->tp.flags = TCP_FLAGS_BE16(tcp);
649 memset(&key->tp, 0, sizeof(key->tp));
651 } else if (key->ip.proto == NEXTHDR_UDP) {
652 if (udphdr_ok(skb)) {
653 struct udphdr *udp = udp_hdr(skb);
654 key->tp.src = udp->source;
655 key->tp.dst = udp->dest;
657 memset(&key->tp, 0, sizeof(key->tp));
659 } else if (key->ip.proto == NEXTHDR_SCTP) {
660 if (sctphdr_ok(skb)) {
661 struct sctphdr *sctp = sctp_hdr(skb);
662 key->tp.src = sctp->source;
663 key->tp.dst = sctp->dest;
665 memset(&key->tp, 0, sizeof(key->tp));
667 } else if (key->ip.proto == NEXTHDR_ICMP) {
668 if (icmp6hdr_ok(skb)) {
669 error = parse_icmpv6(skb, key, nh_len);
673 memset(&key->tp, 0, sizeof(key->tp));
680 int ovs_flow_key_update(struct sk_buff *skb, struct sw_flow_key *key)
682 return key_extract(skb, key);
685 int ovs_flow_key_extract(const struct ovs_tunnel_info *tun_info,
686 struct sk_buff *skb, struct sw_flow_key *key)
688 /* Extract metadata from packet. */
690 memcpy(&key->tun_key, &tun_info->tunnel, sizeof(key->tun_key));
692 BUILD_BUG_ON(((1 << (sizeof(tun_info->options_len) * 8)) - 1) >
693 sizeof(key->tun_opts));
695 if (tun_info->options) {
696 memcpy(TUN_METADATA_OPTS(key, tun_info->options_len),
697 tun_info->options, tun_info->options_len);
698 key->tun_opts_len = tun_info->options_len;
700 key->tun_opts_len = 0;
703 key->tun_opts_len = 0;
704 memset(&key->tun_key, 0, sizeof(key->tun_key));
707 key->phy.priority = skb->priority;
708 key->phy.in_port = OVS_CB(skb)->input_vport->port_no;
709 key->phy.skb_mark = skb->mark;
710 key->ovs_flow_hash = 0;
713 return key_extract(skb, key);
716 int ovs_flow_key_extract_userspace(const struct nlattr *attr,
718 struct sw_flow_key *key, bool log)
722 /* Extract metadata from netlink attributes. */
723 err = ovs_nla_get_flow_metadata(attr, key, log);
727 return key_extract(skb, key);