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/sctp.h>
36 #include <linux/smp.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>
43 #include <net/ip_tunnels.h>
45 #include <net/ndisc.h>
49 #include "flow_netlink.h"
51 u64
ovs_flow_used_time(unsigned long flow_jiffies
)
53 struct timespec cur_ts
;
56 ktime_get_ts(&cur_ts
);
57 idle_ms
= jiffies_to_msecs(jiffies
- flow_jiffies
);
58 cur_ms
= (u64
)cur_ts
.tv_sec
* MSEC_PER_SEC
+
59 cur_ts
.tv_nsec
/ NSEC_PER_MSEC
;
61 return cur_ms
- idle_ms
;
64 #define TCP_FLAGS_BE16(tp) (*(__be16 *)&tcp_flag_word(tp) & htons(0x0FFF))
66 void ovs_flow_stats_update(struct sw_flow
*flow
, __be16 tcp_flags
,
69 struct flow_stats
*stats
;
70 int node
= numa_node_id();
72 stats
= rcu_dereference(flow
->stats
[node
]);
74 /* Check if already have node-specific stats. */
76 spin_lock(&stats
->lock
);
77 /* Mark if we write on the pre-allocated stats. */
78 if (node
== 0 && unlikely(flow
->stats_last_writer
!= node
))
79 flow
->stats_last_writer
= node
;
81 stats
= rcu_dereference(flow
->stats
[0]); /* Pre-allocated. */
82 spin_lock(&stats
->lock
);
84 /* If the current NUMA-node is the only writer on the
85 * pre-allocated stats keep using them.
87 if (unlikely(flow
->stats_last_writer
!= node
)) {
88 /* A previous locker may have already allocated the
89 * stats, so we need to check again. If node-specific
90 * stats were already allocated, we update the pre-
91 * allocated stats as we have already locked them.
93 if (likely(flow
->stats_last_writer
!= NUMA_NO_NODE
)
94 && likely(!rcu_access_pointer(flow
->stats
[node
]))) {
95 /* Try to allocate node-specific stats. */
96 struct flow_stats
*new_stats
;
99 kmem_cache_alloc_node(flow_stats_cache
,
103 if (likely(new_stats
)) {
104 new_stats
->used
= jiffies
;
105 new_stats
->packet_count
= 1;
106 new_stats
->byte_count
= skb
->len
;
107 new_stats
->tcp_flags
= tcp_flags
;
108 spin_lock_init(&new_stats
->lock
);
110 rcu_assign_pointer(flow
->stats
[node
],
115 flow
->stats_last_writer
= node
;
119 stats
->used
= jiffies
;
120 stats
->packet_count
++;
121 stats
->byte_count
+= skb
->len
;
122 stats
->tcp_flags
|= tcp_flags
;
124 spin_unlock(&stats
->lock
);
127 /* Must be called with rcu_read_lock or ovs_mutex. */
128 void ovs_flow_stats_get(const struct sw_flow
*flow
,
129 struct ovs_flow_stats
*ovs_stats
,
130 unsigned long *used
, __be16
*tcp_flags
)
136 memset(ovs_stats
, 0, sizeof(*ovs_stats
));
138 for_each_node(node
) {
139 struct flow_stats
*stats
= rcu_dereference_ovsl(flow
->stats
[node
]);
142 /* Local CPU may write on non-local stats, so we must
143 * block bottom-halves here.
145 spin_lock_bh(&stats
->lock
);
146 if (!*used
|| time_after(stats
->used
, *used
))
148 *tcp_flags
|= stats
->tcp_flags
;
149 ovs_stats
->n_packets
+= stats
->packet_count
;
150 ovs_stats
->n_bytes
+= stats
->byte_count
;
151 spin_unlock_bh(&stats
->lock
);
156 /* Called with ovs_mutex. */
157 void ovs_flow_stats_clear(struct sw_flow
*flow
)
161 for_each_node(node
) {
162 struct flow_stats
*stats
= ovsl_dereference(flow
->stats
[node
]);
165 spin_lock_bh(&stats
->lock
);
167 stats
->packet_count
= 0;
168 stats
->byte_count
= 0;
169 stats
->tcp_flags
= 0;
170 spin_unlock_bh(&stats
->lock
);
175 static int check_header(struct sk_buff
*skb
, int len
)
177 if (unlikely(skb
->len
< len
))
179 if (unlikely(!pskb_may_pull(skb
, len
)))
184 static bool arphdr_ok(struct sk_buff
*skb
)
186 return pskb_may_pull(skb
, skb_network_offset(skb
) +
187 sizeof(struct arp_eth_header
));
190 static int check_iphdr(struct sk_buff
*skb
)
192 unsigned int nh_ofs
= skb_network_offset(skb
);
196 err
= check_header(skb
, nh_ofs
+ sizeof(struct iphdr
));
200 ip_len
= ip_hdrlen(skb
);
201 if (unlikely(ip_len
< sizeof(struct iphdr
) ||
202 skb
->len
< nh_ofs
+ ip_len
))
205 skb_set_transport_header(skb
, nh_ofs
+ ip_len
);
209 static bool tcphdr_ok(struct sk_buff
*skb
)
211 int th_ofs
= skb_transport_offset(skb
);
214 if (unlikely(!pskb_may_pull(skb
, th_ofs
+ sizeof(struct tcphdr
))))
217 tcp_len
= tcp_hdrlen(skb
);
218 if (unlikely(tcp_len
< sizeof(struct tcphdr
) ||
219 skb
->len
< th_ofs
+ tcp_len
))
225 static bool udphdr_ok(struct sk_buff
*skb
)
227 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
228 sizeof(struct udphdr
));
231 static bool sctphdr_ok(struct sk_buff
*skb
)
233 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
234 sizeof(struct sctphdr
));
237 static bool icmphdr_ok(struct sk_buff
*skb
)
239 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
240 sizeof(struct icmphdr
));
243 static int parse_ipv6hdr(struct sk_buff
*skb
, struct sw_flow_key
*key
)
245 unsigned int nh_ofs
= skb_network_offset(skb
);
253 err
= check_header(skb
, nh_ofs
+ sizeof(*nh
));
258 nexthdr
= nh
->nexthdr
;
259 payload_ofs
= (u8
*)(nh
+ 1) - skb
->data
;
261 key
->ip
.proto
= NEXTHDR_NONE
;
262 key
->ip
.tos
= ipv6_get_dsfield(nh
);
263 key
->ip
.ttl
= nh
->hop_limit
;
264 key
->ipv6
.label
= *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
265 key
->ipv6
.addr
.src
= nh
->saddr
;
266 key
->ipv6
.addr
.dst
= nh
->daddr
;
268 payload_ofs
= ipv6_skip_exthdr(skb
, payload_ofs
, &nexthdr
, &frag_off
);
269 if (unlikely(payload_ofs
< 0))
273 if (frag_off
& htons(~0x7))
274 key
->ip
.frag
= OVS_FRAG_TYPE_LATER
;
276 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
278 key
->ip
.frag
= OVS_FRAG_TYPE_NONE
;
281 nh_len
= payload_ofs
- nh_ofs
;
282 skb_set_transport_header(skb
, nh_ofs
+ nh_len
);
283 key
->ip
.proto
= nexthdr
;
287 static bool icmp6hdr_ok(struct sk_buff
*skb
)
289 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
290 sizeof(struct icmp6hdr
));
293 static int parse_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
296 __be16 eth_type
; /* ETH_P_8021Q */
299 struct qtag_prefix
*qp
;
301 if (unlikely(skb
->len
< sizeof(struct qtag_prefix
) + sizeof(__be16
)))
304 if (unlikely(!pskb_may_pull(skb
, sizeof(struct qtag_prefix
) +
308 qp
= (struct qtag_prefix
*) skb
->data
;
309 key
->eth
.tci
= qp
->tci
| htons(VLAN_TAG_PRESENT
);
310 __skb_pull(skb
, sizeof(struct qtag_prefix
));
315 static __be16
parse_ethertype(struct sk_buff
*skb
)
317 struct llc_snap_hdr
{
318 u8 dsap
; /* Always 0xAA */
319 u8 ssap
; /* Always 0xAA */
324 struct llc_snap_hdr
*llc
;
327 proto
= *(__be16
*) skb
->data
;
328 __skb_pull(skb
, sizeof(__be16
));
330 if (ntohs(proto
) >= ETH_P_802_3_MIN
)
333 if (skb
->len
< sizeof(struct llc_snap_hdr
))
334 return htons(ETH_P_802_2
);
336 if (unlikely(!pskb_may_pull(skb
, sizeof(struct llc_snap_hdr
))))
339 llc
= (struct llc_snap_hdr
*) skb
->data
;
340 if (llc
->dsap
!= LLC_SAP_SNAP
||
341 llc
->ssap
!= LLC_SAP_SNAP
||
342 (llc
->oui
[0] | llc
->oui
[1] | llc
->oui
[2]) != 0)
343 return htons(ETH_P_802_2
);
345 __skb_pull(skb
, sizeof(struct llc_snap_hdr
));
347 if (ntohs(llc
->ethertype
) >= ETH_P_802_3_MIN
)
348 return llc
->ethertype
;
350 return htons(ETH_P_802_2
);
353 static int parse_icmpv6(struct sk_buff
*skb
, struct sw_flow_key
*key
,
356 struct icmp6hdr
*icmp
= icmp6_hdr(skb
);
358 /* The ICMPv6 type and code fields use the 16-bit transport port
359 * fields, so we need to store them in 16-bit network byte order.
361 key
->tp
.src
= htons(icmp
->icmp6_type
);
362 key
->tp
.dst
= htons(icmp
->icmp6_code
);
363 memset(&key
->ipv6
.nd
, 0, sizeof(key
->ipv6
.nd
));
365 if (icmp
->icmp6_code
== 0 &&
366 (icmp
->icmp6_type
== NDISC_NEIGHBOUR_SOLICITATION
||
367 icmp
->icmp6_type
== NDISC_NEIGHBOUR_ADVERTISEMENT
)) {
368 int icmp_len
= skb
->len
- skb_transport_offset(skb
);
372 /* In order to process neighbor discovery options, we need the
375 if (unlikely(icmp_len
< sizeof(*nd
)))
378 if (unlikely(skb_linearize(skb
)))
381 nd
= (struct nd_msg
*)skb_transport_header(skb
);
382 key
->ipv6
.nd
.target
= nd
->target
;
384 icmp_len
-= sizeof(*nd
);
386 while (icmp_len
>= 8) {
387 struct nd_opt_hdr
*nd_opt
=
388 (struct nd_opt_hdr
*)(nd
->opt
+ offset
);
389 int opt_len
= nd_opt
->nd_opt_len
* 8;
391 if (unlikely(!opt_len
|| opt_len
> icmp_len
))
394 /* Store the link layer address if the appropriate
395 * option is provided. It is considered an error if
396 * the same link layer option is specified twice.
398 if (nd_opt
->nd_opt_type
== ND_OPT_SOURCE_LL_ADDR
400 if (unlikely(!is_zero_ether_addr(key
->ipv6
.nd
.sll
)))
402 ether_addr_copy(key
->ipv6
.nd
.sll
,
403 &nd
->opt
[offset
+sizeof(*nd_opt
)]);
404 } else if (nd_opt
->nd_opt_type
== ND_OPT_TARGET_LL_ADDR
406 if (unlikely(!is_zero_ether_addr(key
->ipv6
.nd
.tll
)))
408 ether_addr_copy(key
->ipv6
.nd
.tll
,
409 &nd
->opt
[offset
+sizeof(*nd_opt
)]);
420 memset(&key
->ipv6
.nd
.target
, 0, sizeof(key
->ipv6
.nd
.target
));
421 memset(key
->ipv6
.nd
.sll
, 0, sizeof(key
->ipv6
.nd
.sll
));
422 memset(key
->ipv6
.nd
.tll
, 0, sizeof(key
->ipv6
.nd
.tll
));
428 * key_extract - extracts a flow key from an Ethernet frame.
429 * @skb: sk_buff that contains the frame, with skb->data pointing to the
431 * @key: output flow key
433 * The caller must ensure that skb->len >= ETH_HLEN.
435 * Returns 0 if successful, otherwise a negative errno value.
437 * Initializes @skb header pointers as follows:
439 * - skb->mac_header: the Ethernet header.
441 * - skb->network_header: just past the Ethernet header, or just past the
442 * VLAN header, to the first byte of the Ethernet payload.
444 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
445 * on output, then just past the IP header, if one is present and
446 * of a correct length, otherwise the same as skb->network_header.
447 * For other key->eth.type values it is left untouched.
449 static int key_extract(struct sk_buff
*skb
, struct sw_flow_key
*key
)
454 /* Flags are always used as part of stats */
457 skb_reset_mac_header(skb
);
459 /* Link layer. We are guaranteed to have at least the 14 byte Ethernet
460 * header in the linear data area.
463 ether_addr_copy(key
->eth
.src
, eth
->h_source
);
464 ether_addr_copy(key
->eth
.dst
, eth
->h_dest
);
466 __skb_pull(skb
, 2 * ETH_ALEN
);
467 /* We are going to push all headers that we pull, so no need to
468 * update skb->csum here.
472 if (vlan_tx_tag_present(skb
))
473 key
->eth
.tci
= htons(skb
->vlan_tci
);
474 else if (eth
->h_proto
== htons(ETH_P_8021Q
))
475 if (unlikely(parse_vlan(skb
, key
)))
478 key
->eth
.type
= parse_ethertype(skb
);
479 if (unlikely(key
->eth
.type
== htons(0)))
482 skb_reset_network_header(skb
);
483 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
486 if (key
->eth
.type
== htons(ETH_P_IP
)) {
490 error
= check_iphdr(skb
);
491 if (unlikely(error
)) {
492 memset(&key
->ip
, 0, sizeof(key
->ip
));
493 memset(&key
->ipv4
, 0, sizeof(key
->ipv4
));
494 if (error
== -EINVAL
) {
495 skb
->transport_header
= skb
->network_header
;
502 key
->ipv4
.addr
.src
= nh
->saddr
;
503 key
->ipv4
.addr
.dst
= nh
->daddr
;
505 key
->ip
.proto
= nh
->protocol
;
506 key
->ip
.tos
= nh
->tos
;
507 key
->ip
.ttl
= nh
->ttl
;
509 offset
= nh
->frag_off
& htons(IP_OFFSET
);
511 key
->ip
.frag
= OVS_FRAG_TYPE_LATER
;
514 if (nh
->frag_off
& htons(IP_MF
) ||
515 skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
516 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
518 key
->ip
.frag
= OVS_FRAG_TYPE_NONE
;
520 /* Transport layer. */
521 if (key
->ip
.proto
== IPPROTO_TCP
) {
522 if (tcphdr_ok(skb
)) {
523 struct tcphdr
*tcp
= tcp_hdr(skb
);
524 key
->tp
.src
= tcp
->source
;
525 key
->tp
.dst
= tcp
->dest
;
526 key
->tp
.flags
= TCP_FLAGS_BE16(tcp
);
528 memset(&key
->tp
, 0, sizeof(key
->tp
));
531 } else if (key
->ip
.proto
== IPPROTO_UDP
) {
532 if (udphdr_ok(skb
)) {
533 struct udphdr
*udp
= udp_hdr(skb
);
534 key
->tp
.src
= udp
->source
;
535 key
->tp
.dst
= udp
->dest
;
537 memset(&key
->tp
, 0, sizeof(key
->tp
));
539 } else if (key
->ip
.proto
== IPPROTO_SCTP
) {
540 if (sctphdr_ok(skb
)) {
541 struct sctphdr
*sctp
= sctp_hdr(skb
);
542 key
->tp
.src
= sctp
->source
;
543 key
->tp
.dst
= sctp
->dest
;
545 memset(&key
->tp
, 0, sizeof(key
->tp
));
547 } else if (key
->ip
.proto
== IPPROTO_ICMP
) {
548 if (icmphdr_ok(skb
)) {
549 struct icmphdr
*icmp
= icmp_hdr(skb
);
550 /* The ICMP type and code fields use the 16-bit
551 * transport port fields, so we need to store
552 * them in 16-bit network byte order. */
553 key
->tp
.src
= htons(icmp
->type
);
554 key
->tp
.dst
= htons(icmp
->code
);
556 memset(&key
->tp
, 0, sizeof(key
->tp
));
560 } else if (key
->eth
.type
== htons(ETH_P_ARP
) ||
561 key
->eth
.type
== htons(ETH_P_RARP
)) {
562 struct arp_eth_header
*arp
;
563 bool arp_available
= arphdr_ok(skb
);
565 arp
= (struct arp_eth_header
*)skb_network_header(skb
);
568 arp
->ar_hrd
== htons(ARPHRD_ETHER
) &&
569 arp
->ar_pro
== htons(ETH_P_IP
) &&
570 arp
->ar_hln
== ETH_ALEN
&&
573 /* We only match on the lower 8 bits of the opcode. */
574 if (ntohs(arp
->ar_op
) <= 0xff)
575 key
->ip
.proto
= ntohs(arp
->ar_op
);
579 memcpy(&key
->ipv4
.addr
.src
, arp
->ar_sip
, sizeof(key
->ipv4
.addr
.src
));
580 memcpy(&key
->ipv4
.addr
.dst
, arp
->ar_tip
, sizeof(key
->ipv4
.addr
.dst
));
581 ether_addr_copy(key
->ipv4
.arp
.sha
, arp
->ar_sha
);
582 ether_addr_copy(key
->ipv4
.arp
.tha
, arp
->ar_tha
);
584 memset(&key
->ip
, 0, sizeof(key
->ip
));
585 memset(&key
->ipv4
, 0, sizeof(key
->ipv4
));
587 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
588 int nh_len
; /* IPv6 Header + Extensions */
590 nh_len
= parse_ipv6hdr(skb
, key
);
591 if (unlikely(nh_len
< 0)) {
592 memset(&key
->ip
, 0, sizeof(key
->ip
));
593 memset(&key
->ipv6
.addr
, 0, sizeof(key
->ipv6
.addr
));
594 if (nh_len
== -EINVAL
) {
595 skb
->transport_header
= skb
->network_header
;
603 if (key
->ip
.frag
== OVS_FRAG_TYPE_LATER
)
605 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
606 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
608 /* Transport layer. */
609 if (key
->ip
.proto
== NEXTHDR_TCP
) {
610 if (tcphdr_ok(skb
)) {
611 struct tcphdr
*tcp
= tcp_hdr(skb
);
612 key
->tp
.src
= tcp
->source
;
613 key
->tp
.dst
= tcp
->dest
;
614 key
->tp
.flags
= TCP_FLAGS_BE16(tcp
);
616 memset(&key
->tp
, 0, sizeof(key
->tp
));
618 } else if (key
->ip
.proto
== NEXTHDR_UDP
) {
619 if (udphdr_ok(skb
)) {
620 struct udphdr
*udp
= udp_hdr(skb
);
621 key
->tp
.src
= udp
->source
;
622 key
->tp
.dst
= udp
->dest
;
624 memset(&key
->tp
, 0, sizeof(key
->tp
));
626 } else if (key
->ip
.proto
== NEXTHDR_SCTP
) {
627 if (sctphdr_ok(skb
)) {
628 struct sctphdr
*sctp
= sctp_hdr(skb
);
629 key
->tp
.src
= sctp
->source
;
630 key
->tp
.dst
= sctp
->dest
;
632 memset(&key
->tp
, 0, sizeof(key
->tp
));
634 } else if (key
->ip
.proto
== NEXTHDR_ICMP
) {
635 if (icmp6hdr_ok(skb
)) {
636 error
= parse_icmpv6(skb
, key
, nh_len
);
640 memset(&key
->tp
, 0, sizeof(key
->tp
));
647 int ovs_flow_key_update(struct sk_buff
*skb
, struct sw_flow_key
*key
)
649 return key_extract(skb
, key
);
652 int ovs_flow_key_extract(struct ovs_tunnel_info
*tun_info
,
653 struct sk_buff
*skb
, struct sw_flow_key
*key
)
655 /* Extract metadata from packet. */
657 memcpy(&key
->tun_key
, &tun_info
->tunnel
, sizeof(key
->tun_key
));
659 if (tun_info
->options
) {
660 BUILD_BUG_ON((1 << (sizeof(tun_info
->options_len
) *
662 > sizeof(key
->tun_opts
));
663 memcpy(GENEVE_OPTS(key
, tun_info
->options_len
),
664 tun_info
->options
, tun_info
->options_len
);
665 key
->tun_opts_len
= tun_info
->options_len
;
667 key
->tun_opts_len
= 0;
670 key
->tun_opts_len
= 0;
671 memset(&key
->tun_key
, 0, sizeof(key
->tun_key
));
674 key
->phy
.priority
= skb
->priority
;
675 key
->phy
.in_port
= OVS_CB(skb
)->input_vport
->port_no
;
676 key
->phy
.skb_mark
= skb
->mark
;
677 key
->ovs_flow_hash
= 0;
680 return key_extract(skb
, key
);
683 int ovs_flow_key_extract_userspace(const struct nlattr
*attr
,
685 struct sw_flow_key
*key
)
689 /* Extract metadata from netlink attributes. */
690 err
= ovs_nla_get_flow_metadata(attr
, key
);
694 return key_extract(skb
, key
);