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
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
;
68 __be16 tcp_flags
= flow
->key
.tp
.flags
;
69 int node
= numa_node_id();
71 stats
= rcu_dereference(flow
->stats
[node
]);
73 /* Check if already have node-specific stats. */
75 spin_lock(&stats
->lock
);
76 /* Mark if we write on the pre-allocated stats. */
77 if (node
== 0 && unlikely(flow
->stats_last_writer
!= node
))
78 flow
->stats_last_writer
= node
;
80 stats
= rcu_dereference(flow
->stats
[0]); /* Pre-allocated. */
81 spin_lock(&stats
->lock
);
83 /* If the current NUMA-node is the only writer on the
84 * pre-allocated stats keep using them.
86 if (unlikely(flow
->stats_last_writer
!= node
)) {
87 /* A previous locker may have already allocated the
88 * stats, so we need to check again. If node-specific
89 * stats were already allocated, we update the pre-
90 * allocated stats as we have already locked them.
92 if (likely(flow
->stats_last_writer
!= NUMA_NO_NODE
)
93 && likely(!rcu_dereference(flow
->stats
[node
]))) {
94 /* Try to allocate node-specific stats. */
95 struct flow_stats
*new_stats
;
98 kmem_cache_alloc_node(flow_stats_cache
,
102 if (likely(new_stats
)) {
103 new_stats
->used
= jiffies
;
104 new_stats
->packet_count
= 1;
105 new_stats
->byte_count
= skb
->len
;
106 new_stats
->tcp_flags
= tcp_flags
;
107 spin_lock_init(&new_stats
->lock
);
109 rcu_assign_pointer(flow
->stats
[node
],
114 flow
->stats_last_writer
= node
;
118 stats
->used
= jiffies
;
119 stats
->packet_count
++;
120 stats
->byte_count
+= skb
->len
;
121 stats
->tcp_flags
|= tcp_flags
;
123 spin_unlock(&stats
->lock
);
126 /* Called with ovs_mutex. */
127 void ovs_flow_stats_get(struct sw_flow
*flow
, struct ovs_flow_stats
*ovs_stats
,
128 unsigned long *used
, __be16
*tcp_flags
)
134 memset(ovs_stats
, 0, sizeof(*ovs_stats
));
136 for_each_node(node
) {
137 struct flow_stats
*stats
= ovsl_dereference(flow
->stats
[node
]);
140 /* Local CPU may write on non-local stats, so we must
141 * block bottom-halves here.
143 spin_lock_bh(&stats
->lock
);
144 if (!*used
|| time_after(stats
->used
, *used
))
146 *tcp_flags
|= stats
->tcp_flags
;
147 ovs_stats
->n_packets
+= stats
->packet_count
;
148 ovs_stats
->n_bytes
+= stats
->byte_count
;
149 spin_unlock_bh(&stats
->lock
);
154 void ovs_flow_stats_clear(struct sw_flow
*flow
)
158 for_each_node(node
) {
159 struct flow_stats
*stats
= rcu_dereference(flow
->stats
[node
]);
162 spin_lock_bh(&stats
->lock
);
164 stats
->packet_count
= 0;
165 stats
->byte_count
= 0;
166 stats
->tcp_flags
= 0;
167 spin_unlock_bh(&stats
->lock
);
172 static int check_header(struct sk_buff
*skb
, int len
)
174 if (unlikely(skb
->len
< len
))
176 if (unlikely(!pskb_may_pull(skb
, len
)))
181 static bool arphdr_ok(struct sk_buff
*skb
)
183 return pskb_may_pull(skb
, skb_network_offset(skb
) +
184 sizeof(struct arp_eth_header
));
187 static int check_iphdr(struct sk_buff
*skb
)
189 unsigned int nh_ofs
= skb_network_offset(skb
);
193 err
= check_header(skb
, nh_ofs
+ sizeof(struct iphdr
));
197 ip_len
= ip_hdrlen(skb
);
198 if (unlikely(ip_len
< sizeof(struct iphdr
) ||
199 skb
->len
< nh_ofs
+ ip_len
))
202 skb_set_transport_header(skb
, nh_ofs
+ ip_len
);
206 static bool tcphdr_ok(struct sk_buff
*skb
)
208 int th_ofs
= skb_transport_offset(skb
);
211 if (unlikely(!pskb_may_pull(skb
, th_ofs
+ sizeof(struct tcphdr
))))
214 tcp_len
= tcp_hdrlen(skb
);
215 if (unlikely(tcp_len
< sizeof(struct tcphdr
) ||
216 skb
->len
< th_ofs
+ tcp_len
))
222 static bool udphdr_ok(struct sk_buff
*skb
)
224 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
225 sizeof(struct udphdr
));
228 static bool sctphdr_ok(struct sk_buff
*skb
)
230 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
231 sizeof(struct sctphdr
));
234 static bool icmphdr_ok(struct sk_buff
*skb
)
236 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
237 sizeof(struct icmphdr
));
240 static int parse_ipv6hdr(struct sk_buff
*skb
, struct sw_flow_key
*key
)
242 unsigned int nh_ofs
= skb_network_offset(skb
);
250 err
= check_header(skb
, nh_ofs
+ sizeof(*nh
));
255 nexthdr
= nh
->nexthdr
;
256 payload_ofs
= (u8
*)(nh
+ 1) - skb
->data
;
258 key
->ip
.proto
= NEXTHDR_NONE
;
259 key
->ip
.tos
= ipv6_get_dsfield(nh
);
260 key
->ip
.ttl
= nh
->hop_limit
;
261 key
->ipv6
.label
= *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
262 key
->ipv6
.addr
.src
= nh
->saddr
;
263 key
->ipv6
.addr
.dst
= nh
->daddr
;
265 payload_ofs
= ipv6_skip_exthdr(skb
, payload_ofs
, &nexthdr
, &frag_off
);
266 if (unlikely(payload_ofs
< 0))
270 if (frag_off
& htons(~0x7))
271 key
->ip
.frag
= OVS_FRAG_TYPE_LATER
;
273 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
276 nh_len
= payload_ofs
- nh_ofs
;
277 skb_set_transport_header(skb
, nh_ofs
+ nh_len
);
278 key
->ip
.proto
= nexthdr
;
282 static bool icmp6hdr_ok(struct sk_buff
*skb
)
284 return pskb_may_pull(skb
, skb_transport_offset(skb
) +
285 sizeof(struct icmp6hdr
));
288 static int parse_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
291 __be16 eth_type
; /* ETH_P_8021Q */
294 struct qtag_prefix
*qp
;
296 if (unlikely(skb
->len
< sizeof(struct qtag_prefix
) + sizeof(__be16
)))
299 if (unlikely(!pskb_may_pull(skb
, sizeof(struct qtag_prefix
) +
303 qp
= (struct qtag_prefix
*) skb
->data
;
304 key
->eth
.tci
= qp
->tci
| htons(VLAN_TAG_PRESENT
);
305 __skb_pull(skb
, sizeof(struct qtag_prefix
));
310 static __be16
parse_ethertype(struct sk_buff
*skb
)
312 struct llc_snap_hdr
{
313 u8 dsap
; /* Always 0xAA */
314 u8 ssap
; /* Always 0xAA */
319 struct llc_snap_hdr
*llc
;
322 proto
= *(__be16
*) skb
->data
;
323 __skb_pull(skb
, sizeof(__be16
));
325 if (ntohs(proto
) >= ETH_P_802_3_MIN
)
328 if (skb
->len
< sizeof(struct llc_snap_hdr
))
329 return htons(ETH_P_802_2
);
331 if (unlikely(!pskb_may_pull(skb
, sizeof(struct llc_snap_hdr
))))
334 llc
= (struct llc_snap_hdr
*) skb
->data
;
335 if (llc
->dsap
!= LLC_SAP_SNAP
||
336 llc
->ssap
!= LLC_SAP_SNAP
||
337 (llc
->oui
[0] | llc
->oui
[1] | llc
->oui
[2]) != 0)
338 return htons(ETH_P_802_2
);
340 __skb_pull(skb
, sizeof(struct llc_snap_hdr
));
342 if (ntohs(llc
->ethertype
) >= ETH_P_802_3_MIN
)
343 return llc
->ethertype
;
345 return htons(ETH_P_802_2
);
348 static int parse_icmpv6(struct sk_buff
*skb
, struct sw_flow_key
*key
,
351 struct icmp6hdr
*icmp
= icmp6_hdr(skb
);
353 /* The ICMPv6 type and code fields use the 16-bit transport port
354 * fields, so we need to store them in 16-bit network byte order.
356 key
->tp
.src
= htons(icmp
->icmp6_type
);
357 key
->tp
.dst
= htons(icmp
->icmp6_code
);
359 if (icmp
->icmp6_code
== 0 &&
360 (icmp
->icmp6_type
== NDISC_NEIGHBOUR_SOLICITATION
||
361 icmp
->icmp6_type
== NDISC_NEIGHBOUR_ADVERTISEMENT
)) {
362 int icmp_len
= skb
->len
- skb_transport_offset(skb
);
366 /* In order to process neighbor discovery options, we need the
369 if (unlikely(icmp_len
< sizeof(*nd
)))
372 if (unlikely(skb_linearize(skb
)))
375 nd
= (struct nd_msg
*)skb_transport_header(skb
);
376 key
->ipv6
.nd
.target
= nd
->target
;
378 icmp_len
-= sizeof(*nd
);
380 while (icmp_len
>= 8) {
381 struct nd_opt_hdr
*nd_opt
=
382 (struct nd_opt_hdr
*)(nd
->opt
+ offset
);
383 int opt_len
= nd_opt
->nd_opt_len
* 8;
385 if (unlikely(!opt_len
|| opt_len
> icmp_len
))
388 /* Store the link layer address if the appropriate
389 * option is provided. It is considered an error if
390 * the same link layer option is specified twice.
392 if (nd_opt
->nd_opt_type
== ND_OPT_SOURCE_LL_ADDR
394 if (unlikely(!is_zero_ether_addr(key
->ipv6
.nd
.sll
)))
396 ether_addr_copy(key
->ipv6
.nd
.sll
,
397 &nd
->opt
[offset
+sizeof(*nd_opt
)]);
398 } else if (nd_opt
->nd_opt_type
== ND_OPT_TARGET_LL_ADDR
400 if (unlikely(!is_zero_ether_addr(key
->ipv6
.nd
.tll
)))
402 ether_addr_copy(key
->ipv6
.nd
.tll
,
403 &nd
->opt
[offset
+sizeof(*nd_opt
)]);
414 memset(&key
->ipv6
.nd
.target
, 0, sizeof(key
->ipv6
.nd
.target
));
415 memset(key
->ipv6
.nd
.sll
, 0, sizeof(key
->ipv6
.nd
.sll
));
416 memset(key
->ipv6
.nd
.tll
, 0, sizeof(key
->ipv6
.nd
.tll
));
422 * ovs_flow_extract - extracts a flow key from an Ethernet frame.
423 * @skb: sk_buff that contains the frame, with skb->data pointing to the
425 * @in_port: port number on which @skb was received.
426 * @key: output flow key
428 * The caller must ensure that skb->len >= ETH_HLEN.
430 * Returns 0 if successful, otherwise a negative errno value.
432 * Initializes @skb header pointers as follows:
434 * - skb->mac_header: the Ethernet header.
436 * - skb->network_header: just past the Ethernet header, or just past the
437 * VLAN header, to the first byte of the Ethernet payload.
439 * - skb->transport_header: If key->eth.type is ETH_P_IP or ETH_P_IPV6
440 * on output, then just past the IP header, if one is present and
441 * of a correct length, otherwise the same as skb->network_header.
442 * For other key->eth.type values it is left untouched.
444 int ovs_flow_extract(struct sk_buff
*skb
, u16 in_port
, struct sw_flow_key
*key
)
449 memset(key
, 0, sizeof(*key
));
451 key
->phy
.priority
= skb
->priority
;
452 if (OVS_CB(skb
)->tun_key
)
453 memcpy(&key
->tun_key
, OVS_CB(skb
)->tun_key
, sizeof(key
->tun_key
));
454 key
->phy
.in_port
= in_port
;
455 key
->phy
.skb_mark
= skb
->mark
;
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. */
470 if (vlan_tx_tag_present(skb
))
471 key
->eth
.tci
= htons(vlan_get_tci(skb
));
472 else if (eth
->h_proto
== htons(ETH_P_8021Q
))
473 if (unlikely(parse_vlan(skb
, key
)))
476 key
->eth
.type
= parse_ethertype(skb
);
477 if (unlikely(key
->eth
.type
== htons(0)))
480 skb_reset_network_header(skb
);
481 __skb_push(skb
, skb
->data
- skb_mac_header(skb
));
484 if (key
->eth
.type
== htons(ETH_P_IP
)) {
488 error
= check_iphdr(skb
);
489 if (unlikely(error
)) {
490 if (error
== -EINVAL
) {
491 skb
->transport_header
= skb
->network_header
;
498 key
->ipv4
.addr
.src
= nh
->saddr
;
499 key
->ipv4
.addr
.dst
= nh
->daddr
;
501 key
->ip
.proto
= nh
->protocol
;
502 key
->ip
.tos
= nh
->tos
;
503 key
->ip
.ttl
= nh
->ttl
;
505 offset
= nh
->frag_off
& htons(IP_OFFSET
);
507 key
->ip
.frag
= OVS_FRAG_TYPE_LATER
;
510 if (nh
->frag_off
& htons(IP_MF
) ||
511 skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
512 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
514 /* Transport layer. */
515 if (key
->ip
.proto
== IPPROTO_TCP
) {
516 if (tcphdr_ok(skb
)) {
517 struct tcphdr
*tcp
= tcp_hdr(skb
);
518 key
->tp
.src
= tcp
->source
;
519 key
->tp
.dst
= tcp
->dest
;
520 key
->tp
.flags
= TCP_FLAGS_BE16(tcp
);
522 } else if (key
->ip
.proto
== IPPROTO_UDP
) {
523 if (udphdr_ok(skb
)) {
524 struct udphdr
*udp
= udp_hdr(skb
);
525 key
->tp
.src
= udp
->source
;
526 key
->tp
.dst
= udp
->dest
;
528 } else if (key
->ip
.proto
== IPPROTO_SCTP
) {
529 if (sctphdr_ok(skb
)) {
530 struct sctphdr
*sctp
= sctp_hdr(skb
);
531 key
->tp
.src
= sctp
->source
;
532 key
->tp
.dst
= sctp
->dest
;
534 } else if (key
->ip
.proto
== IPPROTO_ICMP
) {
535 if (icmphdr_ok(skb
)) {
536 struct icmphdr
*icmp
= icmp_hdr(skb
);
537 /* The ICMP type and code fields use the 16-bit
538 * transport port fields, so we need to store
539 * them in 16-bit network byte order. */
540 key
->tp
.src
= htons(icmp
->type
);
541 key
->tp
.dst
= htons(icmp
->code
);
545 } else if ((key
->eth
.type
== htons(ETH_P_ARP
) ||
546 key
->eth
.type
== htons(ETH_P_RARP
)) && arphdr_ok(skb
)) {
547 struct arp_eth_header
*arp
;
549 arp
= (struct arp_eth_header
*)skb_network_header(skb
);
551 if (arp
->ar_hrd
== htons(ARPHRD_ETHER
)
552 && arp
->ar_pro
== htons(ETH_P_IP
)
553 && arp
->ar_hln
== ETH_ALEN
554 && arp
->ar_pln
== 4) {
556 /* We only match on the lower 8 bits of the opcode. */
557 if (ntohs(arp
->ar_op
) <= 0xff)
558 key
->ip
.proto
= ntohs(arp
->ar_op
);
559 memcpy(&key
->ipv4
.addr
.src
, arp
->ar_sip
, sizeof(key
->ipv4
.addr
.src
));
560 memcpy(&key
->ipv4
.addr
.dst
, arp
->ar_tip
, sizeof(key
->ipv4
.addr
.dst
));
561 ether_addr_copy(key
->ipv4
.arp
.sha
, arp
->ar_sha
);
562 ether_addr_copy(key
->ipv4
.arp
.tha
, arp
->ar_tha
);
564 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
565 int nh_len
; /* IPv6 Header + Extensions */
567 nh_len
= parse_ipv6hdr(skb
, key
);
568 if (unlikely(nh_len
< 0)) {
569 if (nh_len
== -EINVAL
) {
570 skb
->transport_header
= skb
->network_header
;
578 if (key
->ip
.frag
== OVS_FRAG_TYPE_LATER
)
580 if (skb_shinfo(skb
)->gso_type
& SKB_GSO_UDP
)
581 key
->ip
.frag
= OVS_FRAG_TYPE_FIRST
;
583 /* Transport layer. */
584 if (key
->ip
.proto
== NEXTHDR_TCP
) {
585 if (tcphdr_ok(skb
)) {
586 struct tcphdr
*tcp
= tcp_hdr(skb
);
587 key
->tp
.src
= tcp
->source
;
588 key
->tp
.dst
= tcp
->dest
;
589 key
->tp
.flags
= TCP_FLAGS_BE16(tcp
);
591 } else if (key
->ip
.proto
== NEXTHDR_UDP
) {
592 if (udphdr_ok(skb
)) {
593 struct udphdr
*udp
= udp_hdr(skb
);
594 key
->tp
.src
= udp
->source
;
595 key
->tp
.dst
= udp
->dest
;
597 } else if (key
->ip
.proto
== NEXTHDR_SCTP
) {
598 if (sctphdr_ok(skb
)) {
599 struct sctphdr
*sctp
= sctp_hdr(skb
);
600 key
->tp
.src
= sctp
->source
;
601 key
->tp
.dst
= sctp
->dest
;
603 } else if (key
->ip
.proto
== NEXTHDR_ICMP
) {
604 if (icmp6hdr_ok(skb
)) {
605 error
= parse_icmpv6(skb
, key
, nh_len
);