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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/skbuff.h>
24 #include <linux/openvswitch.h>
25 #include <linux/netfilter_ipv6.h>
26 #include <linux/sctp.h>
27 #include <linux/tcp.h>
28 #include <linux/udp.h>
29 #include <linux/in6.h>
30 #include <linux/if_arp.h>
31 #include <linux/if_vlan.h>
36 #include <net/ip6_fib.h>
37 #include <net/checksum.h>
38 #include <net/dsfield.h>
40 #include <net/sctp/checksum.h>
44 #include "conntrack.h"
47 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
48 struct sw_flow_key
*key
,
49 const struct nlattr
*attr
, int len
);
51 struct deferred_action
{
53 const struct nlattr
*actions
;
55 /* Store pkt_key clone when creating deferred action. */
56 struct sw_flow_key pkt_key
;
59 #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
60 struct ovs_frag_data
{
64 __be16 inner_protocol
;
65 u16 network_offset
; /* valid only for MPLS */
70 u8 l2_data
[MAX_L2_LEN
];
73 static DEFINE_PER_CPU(struct ovs_frag_data
, ovs_frag_data_storage
);
75 #define DEFERRED_ACTION_FIFO_SIZE 10
76 #define OVS_RECURSION_LIMIT 5
77 #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
81 /* Deferred action fifo queue storage. */
82 struct deferred_action fifo
[DEFERRED_ACTION_FIFO_SIZE
];
86 struct sw_flow_key key
[OVS_DEFERRED_ACTION_THRESHOLD
];
89 static struct action_fifo __percpu
*action_fifos
;
90 static struct recirc_keys __percpu
*recirc_keys
;
91 static DEFINE_PER_CPU(int, exec_actions_level
);
93 static void action_fifo_init(struct action_fifo
*fifo
)
99 static bool action_fifo_is_empty(const struct action_fifo
*fifo
)
101 return (fifo
->head
== fifo
->tail
);
104 static struct deferred_action
*action_fifo_get(struct action_fifo
*fifo
)
106 if (action_fifo_is_empty(fifo
))
109 return &fifo
->fifo
[fifo
->tail
++];
112 static struct deferred_action
*action_fifo_put(struct action_fifo
*fifo
)
114 if (fifo
->head
>= DEFERRED_ACTION_FIFO_SIZE
- 1)
117 return &fifo
->fifo
[fifo
->head
++];
120 /* Return true if fifo is not full */
121 static struct deferred_action
*add_deferred_actions(struct sk_buff
*skb
,
122 const struct sw_flow_key
*key
,
123 const struct nlattr
*attr
)
125 struct action_fifo
*fifo
;
126 struct deferred_action
*da
;
128 fifo
= this_cpu_ptr(action_fifos
);
129 da
= action_fifo_put(fifo
);
139 static void invalidate_flow_key(struct sw_flow_key
*key
)
141 key
->mac_proto
|= SW_FLOW_KEY_INVALID
;
144 static bool is_flow_key_valid(const struct sw_flow_key
*key
)
146 return !(key
->mac_proto
& SW_FLOW_KEY_INVALID
);
149 static void update_ethertype(struct sk_buff
*skb
, struct ethhdr
*hdr
,
152 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
153 __be16 diff
[] = { ~(hdr
->h_proto
), ethertype
};
155 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
159 hdr
->h_proto
= ethertype
;
162 static int push_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
163 const struct ovs_action_push_mpls
*mpls
)
165 struct mpls_shim_hdr
*new_mpls_lse
;
167 /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
168 if (skb
->encapsulation
)
171 if (skb_cow_head(skb
, MPLS_HLEN
) < 0)
174 if (!skb
->inner_protocol
) {
175 skb_set_inner_network_header(skb
, skb
->mac_len
);
176 skb_set_inner_protocol(skb
, skb
->protocol
);
179 skb_push(skb
, MPLS_HLEN
);
180 memmove(skb_mac_header(skb
) - MPLS_HLEN
, skb_mac_header(skb
),
182 skb_reset_mac_header(skb
);
183 skb_set_network_header(skb
, skb
->mac_len
);
185 new_mpls_lse
= mpls_hdr(skb
);
186 new_mpls_lse
->label_stack_entry
= mpls
->mpls_lse
;
188 skb_postpush_rcsum(skb
, new_mpls_lse
, MPLS_HLEN
);
190 if (ovs_key_mac_proto(key
) == MAC_PROTO_ETHERNET
)
191 update_ethertype(skb
, eth_hdr(skb
), mpls
->mpls_ethertype
);
192 skb
->protocol
= mpls
->mpls_ethertype
;
194 invalidate_flow_key(key
);
198 static int pop_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
199 const __be16 ethertype
)
203 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
207 skb_postpull_rcsum(skb
, mpls_hdr(skb
), MPLS_HLEN
);
209 memmove(skb_mac_header(skb
) + MPLS_HLEN
, skb_mac_header(skb
),
212 __skb_pull(skb
, MPLS_HLEN
);
213 skb_reset_mac_header(skb
);
214 skb_set_network_header(skb
, skb
->mac_len
);
216 if (ovs_key_mac_proto(key
) == MAC_PROTO_ETHERNET
) {
219 /* mpls_hdr() is used to locate the ethertype field correctly in the
220 * presence of VLAN tags.
222 hdr
= (struct ethhdr
*)((void *)mpls_hdr(skb
) - ETH_HLEN
);
223 update_ethertype(skb
, hdr
, ethertype
);
225 if (eth_p_mpls(skb
->protocol
))
226 skb
->protocol
= ethertype
;
228 invalidate_flow_key(key
);
232 static int set_mpls(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
233 const __be32
*mpls_lse
, const __be32
*mask
)
235 struct mpls_shim_hdr
*stack
;
239 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
243 stack
= mpls_hdr(skb
);
244 lse
= OVS_MASKED(stack
->label_stack_entry
, *mpls_lse
, *mask
);
245 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
246 __be32 diff
[] = { ~(stack
->label_stack_entry
), lse
};
248 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
252 stack
->label_stack_entry
= lse
;
253 flow_key
->mpls
.top_lse
= lse
;
257 static int pop_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
261 err
= skb_vlan_pop(skb
);
262 if (skb_vlan_tag_present(skb
)) {
263 invalidate_flow_key(key
);
265 key
->eth
.vlan
.tci
= 0;
266 key
->eth
.vlan
.tpid
= 0;
271 static int push_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
,
272 const struct ovs_action_push_vlan
*vlan
)
274 if (skb_vlan_tag_present(skb
)) {
275 invalidate_flow_key(key
);
277 key
->eth
.vlan
.tci
= vlan
->vlan_tci
;
278 key
->eth
.vlan
.tpid
= vlan
->vlan_tpid
;
280 return skb_vlan_push(skb
, vlan
->vlan_tpid
,
281 ntohs(vlan
->vlan_tci
) & ~VLAN_TAG_PRESENT
);
284 /* 'src' is already properly masked. */
285 static void ether_addr_copy_masked(u8
*dst_
, const u8
*src_
, const u8
*mask_
)
287 u16
*dst
= (u16
*)dst_
;
288 const u16
*src
= (const u16
*)src_
;
289 const u16
*mask
= (const u16
*)mask_
;
291 OVS_SET_MASKED(dst
[0], src
[0], mask
[0]);
292 OVS_SET_MASKED(dst
[1], src
[1], mask
[1]);
293 OVS_SET_MASKED(dst
[2], src
[2], mask
[2]);
296 static int set_eth_addr(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
297 const struct ovs_key_ethernet
*key
,
298 const struct ovs_key_ethernet
*mask
)
302 err
= skb_ensure_writable(skb
, ETH_HLEN
);
306 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
308 ether_addr_copy_masked(eth_hdr(skb
)->h_source
, key
->eth_src
,
310 ether_addr_copy_masked(eth_hdr(skb
)->h_dest
, key
->eth_dst
,
313 skb_postpush_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
315 ether_addr_copy(flow_key
->eth
.src
, eth_hdr(skb
)->h_source
);
316 ether_addr_copy(flow_key
->eth
.dst
, eth_hdr(skb
)->h_dest
);
320 /* pop_eth does not support VLAN packets as this action is never called
323 static int pop_eth(struct sk_buff
*skb
, struct sw_flow_key
*key
)
325 skb_pull_rcsum(skb
, ETH_HLEN
);
326 skb_reset_mac_header(skb
);
327 skb_reset_mac_len(skb
);
329 /* safe right before invalidate_flow_key */
330 key
->mac_proto
= MAC_PROTO_NONE
;
331 invalidate_flow_key(key
);
335 static int push_eth(struct sk_buff
*skb
, struct sw_flow_key
*key
,
336 const struct ovs_action_push_eth
*ethh
)
340 /* Add the new Ethernet header */
341 if (skb_cow_head(skb
, ETH_HLEN
) < 0)
344 skb_push(skb
, ETH_HLEN
);
345 skb_reset_mac_header(skb
);
346 skb_reset_mac_len(skb
);
349 ether_addr_copy(hdr
->h_source
, ethh
->addresses
.eth_src
);
350 ether_addr_copy(hdr
->h_dest
, ethh
->addresses
.eth_dst
);
351 hdr
->h_proto
= skb
->protocol
;
353 skb_postpush_rcsum(skb
, hdr
, ETH_HLEN
);
355 /* safe right before invalidate_flow_key */
356 key
->mac_proto
= MAC_PROTO_ETHERNET
;
357 invalidate_flow_key(key
);
361 static void update_ip_l4_checksum(struct sk_buff
*skb
, struct iphdr
*nh
,
362 __be32 addr
, __be32 new_addr
)
364 int transport_len
= skb
->len
- skb_transport_offset(skb
);
366 if (nh
->frag_off
& htons(IP_OFFSET
))
369 if (nh
->protocol
== IPPROTO_TCP
) {
370 if (likely(transport_len
>= sizeof(struct tcphdr
)))
371 inet_proto_csum_replace4(&tcp_hdr(skb
)->check
, skb
,
372 addr
, new_addr
, true);
373 } else if (nh
->protocol
== IPPROTO_UDP
) {
374 if (likely(transport_len
>= sizeof(struct udphdr
))) {
375 struct udphdr
*uh
= udp_hdr(skb
);
377 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
378 inet_proto_csum_replace4(&uh
->check
, skb
,
379 addr
, new_addr
, true);
381 uh
->check
= CSUM_MANGLED_0
;
387 static void set_ip_addr(struct sk_buff
*skb
, struct iphdr
*nh
,
388 __be32
*addr
, __be32 new_addr
)
390 update_ip_l4_checksum(skb
, nh
, *addr
, new_addr
);
391 csum_replace4(&nh
->check
, *addr
, new_addr
);
396 static void update_ipv6_checksum(struct sk_buff
*skb
, u8 l4_proto
,
397 __be32 addr
[4], const __be32 new_addr
[4])
399 int transport_len
= skb
->len
- skb_transport_offset(skb
);
401 if (l4_proto
== NEXTHDR_TCP
) {
402 if (likely(transport_len
>= sizeof(struct tcphdr
)))
403 inet_proto_csum_replace16(&tcp_hdr(skb
)->check
, skb
,
404 addr
, new_addr
, true);
405 } else if (l4_proto
== NEXTHDR_UDP
) {
406 if (likely(transport_len
>= sizeof(struct udphdr
))) {
407 struct udphdr
*uh
= udp_hdr(skb
);
409 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
410 inet_proto_csum_replace16(&uh
->check
, skb
,
411 addr
, new_addr
, true);
413 uh
->check
= CSUM_MANGLED_0
;
416 } else if (l4_proto
== NEXTHDR_ICMP
) {
417 if (likely(transport_len
>= sizeof(struct icmp6hdr
)))
418 inet_proto_csum_replace16(&icmp6_hdr(skb
)->icmp6_cksum
,
419 skb
, addr
, new_addr
, true);
423 static void mask_ipv6_addr(const __be32 old
[4], const __be32 addr
[4],
424 const __be32 mask
[4], __be32 masked
[4])
426 masked
[0] = OVS_MASKED(old
[0], addr
[0], mask
[0]);
427 masked
[1] = OVS_MASKED(old
[1], addr
[1], mask
[1]);
428 masked
[2] = OVS_MASKED(old
[2], addr
[2], mask
[2]);
429 masked
[3] = OVS_MASKED(old
[3], addr
[3], mask
[3]);
432 static void set_ipv6_addr(struct sk_buff
*skb
, u8 l4_proto
,
433 __be32 addr
[4], const __be32 new_addr
[4],
434 bool recalculate_csum
)
436 if (recalculate_csum
)
437 update_ipv6_checksum(skb
, l4_proto
, addr
, new_addr
);
440 memcpy(addr
, new_addr
, sizeof(__be32
[4]));
443 static void set_ipv6_fl(struct ipv6hdr
*nh
, u32 fl
, u32 mask
)
445 /* Bits 21-24 are always unmasked, so this retains their values. */
446 OVS_SET_MASKED(nh
->flow_lbl
[0], (u8
)(fl
>> 16), (u8
)(mask
>> 16));
447 OVS_SET_MASKED(nh
->flow_lbl
[1], (u8
)(fl
>> 8), (u8
)(mask
>> 8));
448 OVS_SET_MASKED(nh
->flow_lbl
[2], (u8
)fl
, (u8
)mask
);
451 static void set_ip_ttl(struct sk_buff
*skb
, struct iphdr
*nh
, u8 new_ttl
,
454 new_ttl
= OVS_MASKED(nh
->ttl
, new_ttl
, mask
);
456 csum_replace2(&nh
->check
, htons(nh
->ttl
<< 8), htons(new_ttl
<< 8));
460 static int set_ipv4(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
461 const struct ovs_key_ipv4
*key
,
462 const struct ovs_key_ipv4
*mask
)
468 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
469 sizeof(struct iphdr
));
475 /* Setting an IP addresses is typically only a side effect of
476 * matching on them in the current userspace implementation, so it
477 * makes sense to check if the value actually changed.
479 if (mask
->ipv4_src
) {
480 new_addr
= OVS_MASKED(nh
->saddr
, key
->ipv4_src
, mask
->ipv4_src
);
482 if (unlikely(new_addr
!= nh
->saddr
)) {
483 set_ip_addr(skb
, nh
, &nh
->saddr
, new_addr
);
484 flow_key
->ipv4
.addr
.src
= new_addr
;
487 if (mask
->ipv4_dst
) {
488 new_addr
= OVS_MASKED(nh
->daddr
, key
->ipv4_dst
, mask
->ipv4_dst
);
490 if (unlikely(new_addr
!= nh
->daddr
)) {
491 set_ip_addr(skb
, nh
, &nh
->daddr
, new_addr
);
492 flow_key
->ipv4
.addr
.dst
= new_addr
;
495 if (mask
->ipv4_tos
) {
496 ipv4_change_dsfield(nh
, ~mask
->ipv4_tos
, key
->ipv4_tos
);
497 flow_key
->ip
.tos
= nh
->tos
;
499 if (mask
->ipv4_ttl
) {
500 set_ip_ttl(skb
, nh
, key
->ipv4_ttl
, mask
->ipv4_ttl
);
501 flow_key
->ip
.ttl
= nh
->ttl
;
507 static bool is_ipv6_mask_nonzero(const __be32 addr
[4])
509 return !!(addr
[0] | addr
[1] | addr
[2] | addr
[3]);
512 static int set_ipv6(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
513 const struct ovs_key_ipv6
*key
,
514 const struct ovs_key_ipv6
*mask
)
519 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
520 sizeof(struct ipv6hdr
));
526 /* Setting an IP addresses is typically only a side effect of
527 * matching on them in the current userspace implementation, so it
528 * makes sense to check if the value actually changed.
530 if (is_ipv6_mask_nonzero(mask
->ipv6_src
)) {
531 __be32
*saddr
= (__be32
*)&nh
->saddr
;
534 mask_ipv6_addr(saddr
, key
->ipv6_src
, mask
->ipv6_src
, masked
);
536 if (unlikely(memcmp(saddr
, masked
, sizeof(masked
)))) {
537 set_ipv6_addr(skb
, flow_key
->ip
.proto
, saddr
, masked
,
539 memcpy(&flow_key
->ipv6
.addr
.src
, masked
,
540 sizeof(flow_key
->ipv6
.addr
.src
));
543 if (is_ipv6_mask_nonzero(mask
->ipv6_dst
)) {
544 unsigned int offset
= 0;
545 int flags
= IP6_FH_F_SKIP_RH
;
546 bool recalc_csum
= true;
547 __be32
*daddr
= (__be32
*)&nh
->daddr
;
550 mask_ipv6_addr(daddr
, key
->ipv6_dst
, mask
->ipv6_dst
, masked
);
552 if (unlikely(memcmp(daddr
, masked
, sizeof(masked
)))) {
553 if (ipv6_ext_hdr(nh
->nexthdr
))
554 recalc_csum
= (ipv6_find_hdr(skb
, &offset
,
559 set_ipv6_addr(skb
, flow_key
->ip
.proto
, daddr
, masked
,
561 memcpy(&flow_key
->ipv6
.addr
.dst
, masked
,
562 sizeof(flow_key
->ipv6
.addr
.dst
));
565 if (mask
->ipv6_tclass
) {
566 ipv6_change_dsfield(nh
, ~mask
->ipv6_tclass
, key
->ipv6_tclass
);
567 flow_key
->ip
.tos
= ipv6_get_dsfield(nh
);
569 if (mask
->ipv6_label
) {
570 set_ipv6_fl(nh
, ntohl(key
->ipv6_label
),
571 ntohl(mask
->ipv6_label
));
572 flow_key
->ipv6
.label
=
573 *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
575 if (mask
->ipv6_hlimit
) {
576 OVS_SET_MASKED(nh
->hop_limit
, key
->ipv6_hlimit
,
578 flow_key
->ip
.ttl
= nh
->hop_limit
;
583 /* Must follow skb_ensure_writable() since that can move the skb data. */
584 static void set_tp_port(struct sk_buff
*skb
, __be16
*port
,
585 __be16 new_port
, __sum16
*check
)
587 inet_proto_csum_replace2(check
, skb
, *port
, new_port
, false);
591 static int set_udp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
592 const struct ovs_key_udp
*key
,
593 const struct ovs_key_udp
*mask
)
599 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
600 sizeof(struct udphdr
));
605 /* Either of the masks is non-zero, so do not bother checking them. */
606 src
= OVS_MASKED(uh
->source
, key
->udp_src
, mask
->udp_src
);
607 dst
= OVS_MASKED(uh
->dest
, key
->udp_dst
, mask
->udp_dst
);
609 if (uh
->check
&& skb
->ip_summed
!= CHECKSUM_PARTIAL
) {
610 if (likely(src
!= uh
->source
)) {
611 set_tp_port(skb
, &uh
->source
, src
, &uh
->check
);
612 flow_key
->tp
.src
= src
;
614 if (likely(dst
!= uh
->dest
)) {
615 set_tp_port(skb
, &uh
->dest
, dst
, &uh
->check
);
616 flow_key
->tp
.dst
= dst
;
619 if (unlikely(!uh
->check
))
620 uh
->check
= CSUM_MANGLED_0
;
624 flow_key
->tp
.src
= src
;
625 flow_key
->tp
.dst
= dst
;
633 static int set_tcp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
634 const struct ovs_key_tcp
*key
,
635 const struct ovs_key_tcp
*mask
)
641 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
642 sizeof(struct tcphdr
));
647 src
= OVS_MASKED(th
->source
, key
->tcp_src
, mask
->tcp_src
);
648 if (likely(src
!= th
->source
)) {
649 set_tp_port(skb
, &th
->source
, src
, &th
->check
);
650 flow_key
->tp
.src
= src
;
652 dst
= OVS_MASKED(th
->dest
, key
->tcp_dst
, mask
->tcp_dst
);
653 if (likely(dst
!= th
->dest
)) {
654 set_tp_port(skb
, &th
->dest
, dst
, &th
->check
);
655 flow_key
->tp
.dst
= dst
;
662 static int set_sctp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
663 const struct ovs_key_sctp
*key
,
664 const struct ovs_key_sctp
*mask
)
666 unsigned int sctphoff
= skb_transport_offset(skb
);
668 __le32 old_correct_csum
, new_csum
, old_csum
;
671 err
= skb_ensure_writable(skb
, sctphoff
+ sizeof(struct sctphdr
));
676 old_csum
= sh
->checksum
;
677 old_correct_csum
= sctp_compute_cksum(skb
, sctphoff
);
679 sh
->source
= OVS_MASKED(sh
->source
, key
->sctp_src
, mask
->sctp_src
);
680 sh
->dest
= OVS_MASKED(sh
->dest
, key
->sctp_dst
, mask
->sctp_dst
);
682 new_csum
= sctp_compute_cksum(skb
, sctphoff
);
684 /* Carry any checksum errors through. */
685 sh
->checksum
= old_csum
^ old_correct_csum
^ new_csum
;
688 flow_key
->tp
.src
= sh
->source
;
689 flow_key
->tp
.dst
= sh
->dest
;
694 static int ovs_vport_output(struct net
*net
, struct sock
*sk
, struct sk_buff
*skb
)
696 struct ovs_frag_data
*data
= this_cpu_ptr(&ovs_frag_data_storage
);
697 struct vport
*vport
= data
->vport
;
699 if (skb_cow_head(skb
, data
->l2_len
) < 0) {
704 __skb_dst_copy(skb
, data
->dst
);
705 *OVS_CB(skb
) = data
->cb
;
706 skb
->inner_protocol
= data
->inner_protocol
;
707 skb
->vlan_tci
= data
->vlan_tci
;
708 skb
->vlan_proto
= data
->vlan_proto
;
710 /* Reconstruct the MAC header. */
711 skb_push(skb
, data
->l2_len
);
712 memcpy(skb
->data
, &data
->l2_data
, data
->l2_len
);
713 skb_postpush_rcsum(skb
, skb
->data
, data
->l2_len
);
714 skb_reset_mac_header(skb
);
716 if (eth_p_mpls(skb
->protocol
)) {
717 skb
->inner_network_header
= skb
->network_header
;
718 skb_set_network_header(skb
, data
->network_offset
);
719 skb_reset_mac_len(skb
);
722 ovs_vport_send(vport
, skb
, data
->mac_proto
);
727 ovs_dst_get_mtu(const struct dst_entry
*dst
)
729 return dst
->dev
->mtu
;
732 static struct dst_ops ovs_dst_ops
= {
734 .mtu
= ovs_dst_get_mtu
,
737 /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
738 * ovs_vport_output(), which is called once per fragmented packet.
740 static void prepare_frag(struct vport
*vport
, struct sk_buff
*skb
,
741 u16 orig_network_offset
, u8 mac_proto
)
743 unsigned int hlen
= skb_network_offset(skb
);
744 struct ovs_frag_data
*data
;
746 data
= this_cpu_ptr(&ovs_frag_data_storage
);
747 data
->dst
= skb
->_skb_refdst
;
749 data
->cb
= *OVS_CB(skb
);
750 data
->inner_protocol
= skb
->inner_protocol
;
751 data
->network_offset
= orig_network_offset
;
752 data
->vlan_tci
= skb
->vlan_tci
;
753 data
->vlan_proto
= skb
->vlan_proto
;
754 data
->mac_proto
= mac_proto
;
756 memcpy(&data
->l2_data
, skb
->data
, hlen
);
758 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
762 static void ovs_fragment(struct net
*net
, struct vport
*vport
,
763 struct sk_buff
*skb
, u16 mru
,
764 struct sw_flow_key
*key
)
766 u16 orig_network_offset
= 0;
768 if (eth_p_mpls(skb
->protocol
)) {
769 orig_network_offset
= skb_network_offset(skb
);
770 skb
->network_header
= skb
->inner_network_header
;
773 if (skb_network_offset(skb
) > MAX_L2_LEN
) {
774 OVS_NLERR(1, "L2 header too long to fragment");
778 if (key
->eth
.type
== htons(ETH_P_IP
)) {
779 struct dst_entry ovs_dst
;
780 unsigned long orig_dst
;
782 prepare_frag(vport
, skb
, orig_network_offset
,
783 ovs_key_mac_proto(key
));
784 dst_init(&ovs_dst
, &ovs_dst_ops
, NULL
, 1,
785 DST_OBSOLETE_NONE
, DST_NOCOUNT
);
786 ovs_dst
.dev
= vport
->dev
;
788 orig_dst
= skb
->_skb_refdst
;
789 skb_dst_set_noref(skb
, &ovs_dst
);
790 IPCB(skb
)->frag_max_size
= mru
;
792 ip_do_fragment(net
, skb
->sk
, skb
, ovs_vport_output
);
793 refdst_drop(orig_dst
);
794 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
795 const struct nf_ipv6_ops
*v6ops
= nf_get_ipv6_ops();
796 unsigned long orig_dst
;
797 struct rt6_info ovs_rt
;
803 prepare_frag(vport
, skb
, orig_network_offset
,
804 ovs_key_mac_proto(key
));
805 memset(&ovs_rt
, 0, sizeof(ovs_rt
));
806 dst_init(&ovs_rt
.dst
, &ovs_dst_ops
, NULL
, 1,
807 DST_OBSOLETE_NONE
, DST_NOCOUNT
);
808 ovs_rt
.dst
.dev
= vport
->dev
;
810 orig_dst
= skb
->_skb_refdst
;
811 skb_dst_set_noref(skb
, &ovs_rt
.dst
);
812 IP6CB(skb
)->frag_max_size
= mru
;
814 v6ops
->fragment(net
, skb
->sk
, skb
, ovs_vport_output
);
815 refdst_drop(orig_dst
);
817 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
818 ovs_vport_name(vport
), ntohs(key
->eth
.type
), mru
,
828 static void do_output(struct datapath
*dp
, struct sk_buff
*skb
, int out_port
,
829 struct sw_flow_key
*key
)
831 struct vport
*vport
= ovs_vport_rcu(dp
, out_port
);
834 u16 mru
= OVS_CB(skb
)->mru
;
835 u32 cutlen
= OVS_CB(skb
)->cutlen
;
837 if (unlikely(cutlen
> 0)) {
838 if (skb
->len
- cutlen
> ovs_mac_header_len(key
))
839 pskb_trim(skb
, skb
->len
- cutlen
);
841 pskb_trim(skb
, ovs_mac_header_len(key
));
845 (skb
->len
<= mru
+ vport
->dev
->hard_header_len
))) {
846 ovs_vport_send(vport
, skb
, ovs_key_mac_proto(key
));
847 } else if (mru
<= vport
->dev
->mtu
) {
848 struct net
*net
= read_pnet(&dp
->net
);
850 ovs_fragment(net
, vport
, skb
, mru
, key
);
859 static int output_userspace(struct datapath
*dp
, struct sk_buff
*skb
,
860 struct sw_flow_key
*key
, const struct nlattr
*attr
,
861 const struct nlattr
*actions
, int actions_len
,
864 struct dp_upcall_info upcall
;
865 const struct nlattr
*a
;
868 memset(&upcall
, 0, sizeof(upcall
));
869 upcall
.cmd
= OVS_PACKET_CMD_ACTION
;
870 upcall
.mru
= OVS_CB(skb
)->mru
;
872 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
873 a
= nla_next(a
, &rem
)) {
874 switch (nla_type(a
)) {
875 case OVS_USERSPACE_ATTR_USERDATA
:
879 case OVS_USERSPACE_ATTR_PID
:
880 upcall
.portid
= nla_get_u32(a
);
883 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT
: {
884 /* Get out tunnel info. */
887 vport
= ovs_vport_rcu(dp
, nla_get_u32(a
));
891 err
= dev_fill_metadata_dst(vport
->dev
, skb
);
893 upcall
.egress_tun_info
= skb_tunnel_info(skb
);
899 case OVS_USERSPACE_ATTR_ACTIONS
: {
900 /* Include actions. */
901 upcall
.actions
= actions
;
902 upcall
.actions_len
= actions_len
;
906 } /* End of switch. */
909 return ovs_dp_upcall(dp
, skb
, key
, &upcall
, cutlen
);
912 static int sample(struct datapath
*dp
, struct sk_buff
*skb
,
913 struct sw_flow_key
*key
, const struct nlattr
*attr
,
914 const struct nlattr
*actions
, int actions_len
)
916 const struct nlattr
*acts_list
= NULL
;
917 const struct nlattr
*a
;
921 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
922 a
= nla_next(a
, &rem
)) {
925 switch (nla_type(a
)) {
926 case OVS_SAMPLE_ATTR_PROBABILITY
:
927 probability
= nla_get_u32(a
);
928 if (!probability
|| prandom_u32() > probability
)
932 case OVS_SAMPLE_ATTR_ACTIONS
:
938 rem
= nla_len(acts_list
);
939 a
= nla_data(acts_list
);
941 /* Actions list is empty, do nothing */
945 /* The only known usage of sample action is having a single user-space
946 * action, or having a truncate action followed by a single user-space
947 * action. Treat this usage as a special case.
948 * The output_userspace() should clone the skb to be sent to the
949 * user space. This skb will be consumed by its caller.
951 if (unlikely(nla_type(a
) == OVS_ACTION_ATTR_TRUNC
)) {
952 struct ovs_action_trunc
*trunc
= nla_data(a
);
954 if (skb
->len
> trunc
->max_len
)
955 cutlen
= skb
->len
- trunc
->max_len
;
957 a
= nla_next(a
, &rem
);
960 if (likely(nla_type(a
) == OVS_ACTION_ATTR_USERSPACE
&&
961 nla_is_last(a
, rem
)))
962 return output_userspace(dp
, skb
, key
, a
, actions
,
963 actions_len
, cutlen
);
965 skb
= skb_clone(skb
, GFP_ATOMIC
);
967 /* Skip the sample action when out of memory. */
970 if (!add_deferred_actions(skb
, key
, a
)) {
972 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
980 static void execute_hash(struct sk_buff
*skb
, struct sw_flow_key
*key
,
981 const struct nlattr
*attr
)
983 struct ovs_action_hash
*hash_act
= nla_data(attr
);
986 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
987 hash
= skb_get_hash(skb
);
988 hash
= jhash_1word(hash
, hash_act
->hash_basis
);
992 key
->ovs_flow_hash
= hash
;
995 static int execute_set_action(struct sk_buff
*skb
,
996 struct sw_flow_key
*flow_key
,
997 const struct nlattr
*a
)
999 /* Only tunnel set execution is supported without a mask. */
1000 if (nla_type(a
) == OVS_KEY_ATTR_TUNNEL_INFO
) {
1001 struct ovs_tunnel_info
*tun
= nla_data(a
);
1004 dst_hold((struct dst_entry
*)tun
->tun_dst
);
1005 skb_dst_set(skb
, (struct dst_entry
*)tun
->tun_dst
);
1012 /* Mask is at the midpoint of the data. */
1013 #define get_mask(a, type) ((const type)nla_data(a) + 1)
1015 static int execute_masked_set_action(struct sk_buff
*skb
,
1016 struct sw_flow_key
*flow_key
,
1017 const struct nlattr
*a
)
1021 switch (nla_type(a
)) {
1022 case OVS_KEY_ATTR_PRIORITY
:
1023 OVS_SET_MASKED(skb
->priority
, nla_get_u32(a
),
1024 *get_mask(a
, u32
*));
1025 flow_key
->phy
.priority
= skb
->priority
;
1028 case OVS_KEY_ATTR_SKB_MARK
:
1029 OVS_SET_MASKED(skb
->mark
, nla_get_u32(a
), *get_mask(a
, u32
*));
1030 flow_key
->phy
.skb_mark
= skb
->mark
;
1033 case OVS_KEY_ATTR_TUNNEL_INFO
:
1034 /* Masked data not supported for tunnel. */
1038 case OVS_KEY_ATTR_ETHERNET
:
1039 err
= set_eth_addr(skb
, flow_key
, nla_data(a
),
1040 get_mask(a
, struct ovs_key_ethernet
*));
1043 case OVS_KEY_ATTR_IPV4
:
1044 err
= set_ipv4(skb
, flow_key
, nla_data(a
),
1045 get_mask(a
, struct ovs_key_ipv4
*));
1048 case OVS_KEY_ATTR_IPV6
:
1049 err
= set_ipv6(skb
, flow_key
, nla_data(a
),
1050 get_mask(a
, struct ovs_key_ipv6
*));
1053 case OVS_KEY_ATTR_TCP
:
1054 err
= set_tcp(skb
, flow_key
, nla_data(a
),
1055 get_mask(a
, struct ovs_key_tcp
*));
1058 case OVS_KEY_ATTR_UDP
:
1059 err
= set_udp(skb
, flow_key
, nla_data(a
),
1060 get_mask(a
, struct ovs_key_udp
*));
1063 case OVS_KEY_ATTR_SCTP
:
1064 err
= set_sctp(skb
, flow_key
, nla_data(a
),
1065 get_mask(a
, struct ovs_key_sctp
*));
1068 case OVS_KEY_ATTR_MPLS
:
1069 err
= set_mpls(skb
, flow_key
, nla_data(a
), get_mask(a
,
1073 case OVS_KEY_ATTR_CT_STATE
:
1074 case OVS_KEY_ATTR_CT_ZONE
:
1075 case OVS_KEY_ATTR_CT_MARK
:
1076 case OVS_KEY_ATTR_CT_LABELS
:
1084 static int execute_recirc(struct datapath
*dp
, struct sk_buff
*skb
,
1085 struct sw_flow_key
*key
,
1086 const struct nlattr
*a
, int rem
)
1088 struct deferred_action
*da
;
1091 if (!is_flow_key_valid(key
)) {
1094 err
= ovs_flow_key_update(skb
, key
);
1098 BUG_ON(!is_flow_key_valid(key
));
1100 if (!nla_is_last(a
, rem
)) {
1101 /* Recirc action is the not the last action
1102 * of the action list, need to clone the skb.
1104 skb
= skb_clone(skb
, GFP_ATOMIC
);
1106 /* Skip the recirc action when out of memory, but
1107 * continue on with the rest of the action list.
1113 level
= this_cpu_read(exec_actions_level
);
1114 if (level
<= OVS_DEFERRED_ACTION_THRESHOLD
) {
1115 struct recirc_keys
*rks
= this_cpu_ptr(recirc_keys
);
1116 struct sw_flow_key
*recirc_key
= &rks
->key
[level
- 1];
1119 recirc_key
->recirc_id
= nla_get_u32(a
);
1120 ovs_dp_process_packet(skb
, recirc_key
);
1125 da
= add_deferred_actions(skb
, key
, NULL
);
1127 da
->pkt_key
.recirc_id
= nla_get_u32(a
);
1131 if (net_ratelimit())
1132 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1139 /* Execute a list of actions against 'skb'. */
1140 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
1141 struct sw_flow_key
*key
,
1142 const struct nlattr
*attr
, int len
)
1144 /* Every output action needs a separate clone of 'skb', but the common
1145 * case is just a single output action, so that doing a clone and
1146 * then freeing the original skbuff is wasteful. So the following code
1147 * is slightly obscure just to avoid that.
1150 const struct nlattr
*a
;
1153 for (a
= attr
, rem
= len
; rem
> 0;
1154 a
= nla_next(a
, &rem
)) {
1157 if (unlikely(prev_port
!= -1)) {
1158 struct sk_buff
*out_skb
= skb_clone(skb
, GFP_ATOMIC
);
1161 do_output(dp
, out_skb
, prev_port
, key
);
1163 OVS_CB(skb
)->cutlen
= 0;
1167 switch (nla_type(a
)) {
1168 case OVS_ACTION_ATTR_OUTPUT
:
1169 prev_port
= nla_get_u32(a
);
1172 case OVS_ACTION_ATTR_TRUNC
: {
1173 struct ovs_action_trunc
*trunc
= nla_data(a
);
1175 if (skb
->len
> trunc
->max_len
)
1176 OVS_CB(skb
)->cutlen
= skb
->len
- trunc
->max_len
;
1180 case OVS_ACTION_ATTR_USERSPACE
:
1181 output_userspace(dp
, skb
, key
, a
, attr
,
1182 len
, OVS_CB(skb
)->cutlen
);
1183 OVS_CB(skb
)->cutlen
= 0;
1186 case OVS_ACTION_ATTR_HASH
:
1187 execute_hash(skb
, key
, a
);
1190 case OVS_ACTION_ATTR_PUSH_MPLS
:
1191 err
= push_mpls(skb
, key
, nla_data(a
));
1194 case OVS_ACTION_ATTR_POP_MPLS
:
1195 err
= pop_mpls(skb
, key
, nla_get_be16(a
));
1198 case OVS_ACTION_ATTR_PUSH_VLAN
:
1199 err
= push_vlan(skb
, key
, nla_data(a
));
1202 case OVS_ACTION_ATTR_POP_VLAN
:
1203 err
= pop_vlan(skb
, key
);
1206 case OVS_ACTION_ATTR_RECIRC
:
1207 err
= execute_recirc(dp
, skb
, key
, a
, rem
);
1208 if (nla_is_last(a
, rem
)) {
1209 /* If this is the last action, the skb has
1210 * been consumed or freed.
1211 * Return immediately.
1217 case OVS_ACTION_ATTR_SET
:
1218 err
= execute_set_action(skb
, key
, nla_data(a
));
1221 case OVS_ACTION_ATTR_SET_MASKED
:
1222 case OVS_ACTION_ATTR_SET_TO_MASKED
:
1223 err
= execute_masked_set_action(skb
, key
, nla_data(a
));
1226 case OVS_ACTION_ATTR_SAMPLE
:
1227 err
= sample(dp
, skb
, key
, a
, attr
, len
);
1230 case OVS_ACTION_ATTR_CT
:
1231 if (!is_flow_key_valid(key
)) {
1232 err
= ovs_flow_key_update(skb
, key
);
1237 err
= ovs_ct_execute(ovs_dp_get_net(dp
), skb
, key
,
1240 /* Hide stolen IP fragments from user space. */
1242 return err
== -EINPROGRESS
? 0 : err
;
1245 case OVS_ACTION_ATTR_PUSH_ETH
:
1246 err
= push_eth(skb
, key
, nla_data(a
));
1249 case OVS_ACTION_ATTR_POP_ETH
:
1250 err
= pop_eth(skb
, key
);
1254 if (unlikely(err
)) {
1260 if (prev_port
!= -1)
1261 do_output(dp
, skb
, prev_port
, key
);
1268 static void process_deferred_actions(struct datapath
*dp
)
1270 struct action_fifo
*fifo
= this_cpu_ptr(action_fifos
);
1272 /* Do not touch the FIFO in case there is no deferred actions. */
1273 if (action_fifo_is_empty(fifo
))
1276 /* Finishing executing all deferred actions. */
1278 struct deferred_action
*da
= action_fifo_get(fifo
);
1279 struct sk_buff
*skb
= da
->skb
;
1280 struct sw_flow_key
*key
= &da
->pkt_key
;
1281 const struct nlattr
*actions
= da
->actions
;
1284 do_execute_actions(dp
, skb
, key
, actions
,
1287 ovs_dp_process_packet(skb
, key
);
1288 } while (!action_fifo_is_empty(fifo
));
1290 /* Reset FIFO for the next packet. */
1291 action_fifo_init(fifo
);
1294 /* Execute a list of actions against 'skb'. */
1295 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
1296 const struct sw_flow_actions
*acts
,
1297 struct sw_flow_key
*key
)
1301 level
= __this_cpu_inc_return(exec_actions_level
);
1302 if (unlikely(level
> OVS_RECURSION_LIMIT
)) {
1303 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1310 err
= do_execute_actions(dp
, skb
, key
,
1311 acts
->actions
, acts
->actions_len
);
1314 process_deferred_actions(dp
);
1317 __this_cpu_dec(exec_actions_level
);
1321 int action_fifos_init(void)
1323 action_fifos
= alloc_percpu(struct action_fifo
);
1327 recirc_keys
= alloc_percpu(struct recirc_keys
);
1329 free_percpu(action_fifos
);
1336 void action_fifos_exit(void)
1338 free_percpu(action_fifos
);
1339 free_percpu(recirc_keys
);