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/sctp.h>
26 #include <linux/tcp.h>
27 #include <linux/udp.h>
28 #include <linux/in6.h>
29 #include <linux/if_arp.h>
30 #include <linux/if_vlan.h>
34 #include <net/checksum.h>
35 #include <net/dsfield.h>
37 #include <net/sctp/checksum.h>
43 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
44 struct sw_flow_key
*key
,
45 const struct nlattr
*attr
, int len
);
47 struct deferred_action
{
49 const struct nlattr
*actions
;
51 /* Store pkt_key clone when creating deferred action. */
52 struct sw_flow_key pkt_key
;
55 #define DEFERRED_ACTION_FIFO_SIZE 10
59 /* Deferred action fifo queue storage. */
60 struct deferred_action fifo
[DEFERRED_ACTION_FIFO_SIZE
];
63 static struct action_fifo __percpu
*action_fifos
;
64 static DEFINE_PER_CPU(int, exec_actions_level
);
66 static void action_fifo_init(struct action_fifo
*fifo
)
72 static bool action_fifo_is_empty(const struct action_fifo
*fifo
)
74 return (fifo
->head
== fifo
->tail
);
77 static struct deferred_action
*action_fifo_get(struct action_fifo
*fifo
)
79 if (action_fifo_is_empty(fifo
))
82 return &fifo
->fifo
[fifo
->tail
++];
85 static struct deferred_action
*action_fifo_put(struct action_fifo
*fifo
)
87 if (fifo
->head
>= DEFERRED_ACTION_FIFO_SIZE
- 1)
90 return &fifo
->fifo
[fifo
->head
++];
93 /* Return true if fifo is not full */
94 static struct deferred_action
*add_deferred_actions(struct sk_buff
*skb
,
95 const struct sw_flow_key
*key
,
96 const struct nlattr
*attr
)
98 struct action_fifo
*fifo
;
99 struct deferred_action
*da
;
101 fifo
= this_cpu_ptr(action_fifos
);
102 da
= action_fifo_put(fifo
);
112 static void invalidate_flow_key(struct sw_flow_key
*key
)
114 key
->eth
.type
= htons(0);
117 static bool is_flow_key_valid(const struct sw_flow_key
*key
)
119 return !!key
->eth
.type
;
122 static int make_writable(struct sk_buff
*skb
, int write_len
)
124 if (!pskb_may_pull(skb
, write_len
))
127 if (!skb_cloned(skb
) || skb_clone_writable(skb
, write_len
))
130 return pskb_expand_head(skb
, 0, 0, GFP_ATOMIC
);
133 static int push_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
134 const struct ovs_action_push_mpls
*mpls
)
136 __be32
*new_mpls_lse
;
139 /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
140 if (skb
->encapsulation
)
143 if (skb_cow_head(skb
, MPLS_HLEN
) < 0)
146 skb_push(skb
, MPLS_HLEN
);
147 memmove(skb_mac_header(skb
) - MPLS_HLEN
, skb_mac_header(skb
),
149 skb_reset_mac_header(skb
);
151 new_mpls_lse
= (__be32
*)skb_mpls_header(skb
);
152 *new_mpls_lse
= mpls
->mpls_lse
;
154 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
155 skb
->csum
= csum_add(skb
->csum
, csum_partial(new_mpls_lse
,
159 hdr
->h_proto
= mpls
->mpls_ethertype
;
161 skb_set_inner_protocol(skb
, skb
->protocol
);
162 skb
->protocol
= mpls
->mpls_ethertype
;
164 invalidate_flow_key(key
);
168 static int pop_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
169 const __be16 ethertype
)
174 err
= make_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
178 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
179 skb
->csum
= csum_sub(skb
->csum
,
180 csum_partial(skb_mpls_header(skb
),
183 memmove(skb_mac_header(skb
) + MPLS_HLEN
, skb_mac_header(skb
),
186 __skb_pull(skb
, MPLS_HLEN
);
187 skb_reset_mac_header(skb
);
189 /* skb_mpls_header() is used to locate the ethertype
190 * field correctly in the presence of VLAN tags.
192 hdr
= (struct ethhdr
*)(skb_mpls_header(skb
) - ETH_HLEN
);
193 hdr
->h_proto
= ethertype
;
194 if (eth_p_mpls(skb
->protocol
))
195 skb
->protocol
= ethertype
;
197 invalidate_flow_key(key
);
201 static int set_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
202 const __be32
*mpls_lse
)
207 err
= make_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
211 stack
= (__be32
*)skb_mpls_header(skb
);
212 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
213 __be32 diff
[] = { ~(*stack
), *mpls_lse
};
214 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
219 key
->mpls
.top_lse
= *mpls_lse
;
223 /* remove VLAN header from packet and update csum accordingly. */
224 static int __pop_vlan_tci(struct sk_buff
*skb
, __be16
*current_tci
)
226 struct vlan_hdr
*vhdr
;
229 err
= make_writable(skb
, VLAN_ETH_HLEN
);
233 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
234 skb
->csum
= csum_sub(skb
->csum
, csum_partial(skb
->data
235 + (2 * ETH_ALEN
), VLAN_HLEN
, 0));
237 vhdr
= (struct vlan_hdr
*)(skb
->data
+ ETH_HLEN
);
238 *current_tci
= vhdr
->h_vlan_TCI
;
240 memmove(skb
->data
+ VLAN_HLEN
, skb
->data
, 2 * ETH_ALEN
);
241 __skb_pull(skb
, VLAN_HLEN
);
243 vlan_set_encap_proto(skb
, vhdr
);
244 skb
->mac_header
+= VLAN_HLEN
;
246 if (skb_network_offset(skb
) < ETH_HLEN
)
247 skb_set_network_header(skb
, ETH_HLEN
);
249 /* Update mac_len for subsequent MPLS actions */
250 skb_reset_mac_len(skb
);
254 static int pop_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
259 if (likely(vlan_tx_tag_present(skb
))) {
262 if (unlikely(skb
->protocol
!= htons(ETH_P_8021Q
) ||
263 skb
->len
< VLAN_ETH_HLEN
))
266 err
= __pop_vlan_tci(skb
, &tci
);
270 /* move next vlan tag to hw accel tag */
271 if (likely(skb
->protocol
!= htons(ETH_P_8021Q
) ||
272 skb
->len
< VLAN_ETH_HLEN
)) {
277 invalidate_flow_key(key
);
278 err
= __pop_vlan_tci(skb
, &tci
);
282 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021Q
), ntohs(tci
));
286 static int push_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
,
287 const struct ovs_action_push_vlan
*vlan
)
289 if (unlikely(vlan_tx_tag_present(skb
))) {
292 /* push down current VLAN tag */
293 current_tag
= vlan_tx_tag_get(skb
);
295 if (!__vlan_put_tag(skb
, skb
->vlan_proto
, current_tag
))
297 /* Update mac_len for subsequent MPLS actions */
298 skb
->mac_len
+= VLAN_HLEN
;
300 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
301 skb
->csum
= csum_add(skb
->csum
, csum_partial(skb
->data
302 + (2 * ETH_ALEN
), VLAN_HLEN
, 0));
304 invalidate_flow_key(key
);
306 key
->eth
.tci
= vlan
->vlan_tci
;
308 __vlan_hwaccel_put_tag(skb
, vlan
->vlan_tpid
, ntohs(vlan
->vlan_tci
) & ~VLAN_TAG_PRESENT
);
312 static int set_eth_addr(struct sk_buff
*skb
, struct sw_flow_key
*key
,
313 const struct ovs_key_ethernet
*eth_key
)
316 err
= make_writable(skb
, ETH_HLEN
);
320 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
322 ether_addr_copy(eth_hdr(skb
)->h_source
, eth_key
->eth_src
);
323 ether_addr_copy(eth_hdr(skb
)->h_dest
, eth_key
->eth_dst
);
325 ovs_skb_postpush_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
327 ether_addr_copy(key
->eth
.src
, eth_key
->eth_src
);
328 ether_addr_copy(key
->eth
.dst
, eth_key
->eth_dst
);
332 static void set_ip_addr(struct sk_buff
*skb
, struct iphdr
*nh
,
333 __be32
*addr
, __be32 new_addr
)
335 int transport_len
= skb
->len
- skb_transport_offset(skb
);
337 if (nh
->protocol
== IPPROTO_TCP
) {
338 if (likely(transport_len
>= sizeof(struct tcphdr
)))
339 inet_proto_csum_replace4(&tcp_hdr(skb
)->check
, skb
,
341 } else if (nh
->protocol
== IPPROTO_UDP
) {
342 if (likely(transport_len
>= sizeof(struct udphdr
))) {
343 struct udphdr
*uh
= udp_hdr(skb
);
345 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
346 inet_proto_csum_replace4(&uh
->check
, skb
,
349 uh
->check
= CSUM_MANGLED_0
;
354 csum_replace4(&nh
->check
, *addr
, new_addr
);
359 static void update_ipv6_checksum(struct sk_buff
*skb
, u8 l4_proto
,
360 __be32 addr
[4], const __be32 new_addr
[4])
362 int transport_len
= skb
->len
- skb_transport_offset(skb
);
364 if (l4_proto
== IPPROTO_TCP
) {
365 if (likely(transport_len
>= sizeof(struct tcphdr
)))
366 inet_proto_csum_replace16(&tcp_hdr(skb
)->check
, skb
,
368 } else if (l4_proto
== IPPROTO_UDP
) {
369 if (likely(transport_len
>= sizeof(struct udphdr
))) {
370 struct udphdr
*uh
= udp_hdr(skb
);
372 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
373 inet_proto_csum_replace16(&uh
->check
, skb
,
376 uh
->check
= CSUM_MANGLED_0
;
382 static void set_ipv6_addr(struct sk_buff
*skb
, u8 l4_proto
,
383 __be32 addr
[4], const __be32 new_addr
[4],
384 bool recalculate_csum
)
386 if (recalculate_csum
)
387 update_ipv6_checksum(skb
, l4_proto
, addr
, new_addr
);
390 memcpy(addr
, new_addr
, sizeof(__be32
[4]));
393 static void set_ipv6_tc(struct ipv6hdr
*nh
, u8 tc
)
395 nh
->priority
= tc
>> 4;
396 nh
->flow_lbl
[0] = (nh
->flow_lbl
[0] & 0x0F) | ((tc
& 0x0F) << 4);
399 static void set_ipv6_fl(struct ipv6hdr
*nh
, u32 fl
)
401 nh
->flow_lbl
[0] = (nh
->flow_lbl
[0] & 0xF0) | (fl
& 0x000F0000) >> 16;
402 nh
->flow_lbl
[1] = (fl
& 0x0000FF00) >> 8;
403 nh
->flow_lbl
[2] = fl
& 0x000000FF;
406 static void set_ip_ttl(struct sk_buff
*skb
, struct iphdr
*nh
, u8 new_ttl
)
408 csum_replace2(&nh
->check
, htons(nh
->ttl
<< 8), htons(new_ttl
<< 8));
412 static int set_ipv4(struct sk_buff
*skb
, struct sw_flow_key
*key
,
413 const struct ovs_key_ipv4
*ipv4_key
)
418 err
= make_writable(skb
, skb_network_offset(skb
) +
419 sizeof(struct iphdr
));
425 if (ipv4_key
->ipv4_src
!= nh
->saddr
) {
426 set_ip_addr(skb
, nh
, &nh
->saddr
, ipv4_key
->ipv4_src
);
427 key
->ipv4
.addr
.src
= ipv4_key
->ipv4_src
;
430 if (ipv4_key
->ipv4_dst
!= nh
->daddr
) {
431 set_ip_addr(skb
, nh
, &nh
->daddr
, ipv4_key
->ipv4_dst
);
432 key
->ipv4
.addr
.dst
= ipv4_key
->ipv4_dst
;
435 if (ipv4_key
->ipv4_tos
!= nh
->tos
) {
436 ipv4_change_dsfield(nh
, 0, ipv4_key
->ipv4_tos
);
437 key
->ip
.tos
= nh
->tos
;
440 if (ipv4_key
->ipv4_ttl
!= nh
->ttl
) {
441 set_ip_ttl(skb
, nh
, ipv4_key
->ipv4_ttl
);
442 key
->ip
.ttl
= ipv4_key
->ipv4_ttl
;
448 static int set_ipv6(struct sk_buff
*skb
, struct sw_flow_key
*key
,
449 const struct ovs_key_ipv6
*ipv6_key
)
456 err
= make_writable(skb
, skb_network_offset(skb
) +
457 sizeof(struct ipv6hdr
));
462 saddr
= (__be32
*)&nh
->saddr
;
463 daddr
= (__be32
*)&nh
->daddr
;
465 if (memcmp(ipv6_key
->ipv6_src
, saddr
, sizeof(ipv6_key
->ipv6_src
))) {
466 set_ipv6_addr(skb
, ipv6_key
->ipv6_proto
, saddr
,
467 ipv6_key
->ipv6_src
, true);
468 memcpy(&key
->ipv6
.addr
.src
, ipv6_key
->ipv6_src
,
469 sizeof(ipv6_key
->ipv6_src
));
472 if (memcmp(ipv6_key
->ipv6_dst
, daddr
, sizeof(ipv6_key
->ipv6_dst
))) {
473 unsigned int offset
= 0;
474 int flags
= IP6_FH_F_SKIP_RH
;
475 bool recalc_csum
= true;
477 if (ipv6_ext_hdr(nh
->nexthdr
))
478 recalc_csum
= ipv6_find_hdr(skb
, &offset
,
479 NEXTHDR_ROUTING
, NULL
,
480 &flags
) != NEXTHDR_ROUTING
;
482 set_ipv6_addr(skb
, ipv6_key
->ipv6_proto
, daddr
,
483 ipv6_key
->ipv6_dst
, recalc_csum
);
484 memcpy(&key
->ipv6
.addr
.dst
, ipv6_key
->ipv6_dst
,
485 sizeof(ipv6_key
->ipv6_dst
));
488 set_ipv6_tc(nh
, ipv6_key
->ipv6_tclass
);
489 key
->ip
.tos
= ipv6_get_dsfield(nh
);
491 set_ipv6_fl(nh
, ntohl(ipv6_key
->ipv6_label
));
492 key
->ipv6
.label
= *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
494 nh
->hop_limit
= ipv6_key
->ipv6_hlimit
;
495 key
->ip
.ttl
= ipv6_key
->ipv6_hlimit
;
499 /* Must follow make_writable() since that can move the skb data. */
500 static void set_tp_port(struct sk_buff
*skb
, __be16
*port
,
501 __be16 new_port
, __sum16
*check
)
503 inet_proto_csum_replace2(check
, skb
, *port
, new_port
, 0);
508 static void set_udp_port(struct sk_buff
*skb
, __be16
*port
, __be16 new_port
)
510 struct udphdr
*uh
= udp_hdr(skb
);
512 if (uh
->check
&& skb
->ip_summed
!= CHECKSUM_PARTIAL
) {
513 set_tp_port(skb
, port
, new_port
, &uh
->check
);
516 uh
->check
= CSUM_MANGLED_0
;
523 static int set_udp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
524 const struct ovs_key_udp
*udp_port_key
)
529 err
= make_writable(skb
, skb_transport_offset(skb
) +
530 sizeof(struct udphdr
));
535 if (udp_port_key
->udp_src
!= uh
->source
) {
536 set_udp_port(skb
, &uh
->source
, udp_port_key
->udp_src
);
537 key
->tp
.src
= udp_port_key
->udp_src
;
540 if (udp_port_key
->udp_dst
!= uh
->dest
) {
541 set_udp_port(skb
, &uh
->dest
, udp_port_key
->udp_dst
);
542 key
->tp
.dst
= udp_port_key
->udp_dst
;
548 static int set_tcp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
549 const struct ovs_key_tcp
*tcp_port_key
)
554 err
= make_writable(skb
, skb_transport_offset(skb
) +
555 sizeof(struct tcphdr
));
560 if (tcp_port_key
->tcp_src
!= th
->source
) {
561 set_tp_port(skb
, &th
->source
, tcp_port_key
->tcp_src
, &th
->check
);
562 key
->tp
.src
= tcp_port_key
->tcp_src
;
565 if (tcp_port_key
->tcp_dst
!= th
->dest
) {
566 set_tp_port(skb
, &th
->dest
, tcp_port_key
->tcp_dst
, &th
->check
);
567 key
->tp
.dst
= tcp_port_key
->tcp_dst
;
573 static int set_sctp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
574 const struct ovs_key_sctp
*sctp_port_key
)
578 unsigned int sctphoff
= skb_transport_offset(skb
);
580 err
= make_writable(skb
, sctphoff
+ sizeof(struct sctphdr
));
585 if (sctp_port_key
->sctp_src
!= sh
->source
||
586 sctp_port_key
->sctp_dst
!= sh
->dest
) {
587 __le32 old_correct_csum
, new_csum
, old_csum
;
589 old_csum
= sh
->checksum
;
590 old_correct_csum
= sctp_compute_cksum(skb
, sctphoff
);
592 sh
->source
= sctp_port_key
->sctp_src
;
593 sh
->dest
= sctp_port_key
->sctp_dst
;
595 new_csum
= sctp_compute_cksum(skb
, sctphoff
);
597 /* Carry any checksum errors through. */
598 sh
->checksum
= old_csum
^ old_correct_csum
^ new_csum
;
601 key
->tp
.src
= sctp_port_key
->sctp_src
;
602 key
->tp
.dst
= sctp_port_key
->sctp_dst
;
608 static void do_output(struct datapath
*dp
, struct sk_buff
*skb
, int out_port
)
610 struct vport
*vport
= ovs_vport_rcu(dp
, out_port
);
613 ovs_vport_send(vport
, skb
);
618 static int output_userspace(struct datapath
*dp
, struct sk_buff
*skb
,
619 struct sw_flow_key
*key
, const struct nlattr
*attr
)
621 struct ovs_tunnel_info info
;
622 struct dp_upcall_info upcall
;
623 const struct nlattr
*a
;
626 upcall
.cmd
= OVS_PACKET_CMD_ACTION
;
627 upcall
.userdata
= NULL
;
629 upcall
.egress_tun_info
= NULL
;
631 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
632 a
= nla_next(a
, &rem
)) {
633 switch (nla_type(a
)) {
634 case OVS_USERSPACE_ATTR_USERDATA
:
638 case OVS_USERSPACE_ATTR_PID
:
639 upcall
.portid
= nla_get_u32(a
);
642 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT
: {
643 /* Get out tunnel info. */
646 vport
= ovs_vport_rcu(dp
, nla_get_u32(a
));
650 err
= ovs_vport_get_egress_tun_info(vport
, skb
,
653 upcall
.egress_tun_info
= &info
;
658 } /* End of switch. */
661 return ovs_dp_upcall(dp
, skb
, key
, &upcall
);
664 static int sample(struct datapath
*dp
, struct sk_buff
*skb
,
665 struct sw_flow_key
*key
, const struct nlattr
*attr
)
667 const struct nlattr
*acts_list
= NULL
;
668 const struct nlattr
*a
;
671 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
672 a
= nla_next(a
, &rem
)) {
673 switch (nla_type(a
)) {
674 case OVS_SAMPLE_ATTR_PROBABILITY
:
675 if (prandom_u32() >= nla_get_u32(a
))
679 case OVS_SAMPLE_ATTR_ACTIONS
:
685 rem
= nla_len(acts_list
);
686 a
= nla_data(acts_list
);
688 /* Actions list is empty, do nothing */
692 /* The only known usage of sample action is having a single user-space
693 * action. Treat this usage as a special case.
694 * The output_userspace() should clone the skb to be sent to the
695 * user space. This skb will be consumed by its caller.
697 if (likely(nla_type(a
) == OVS_ACTION_ATTR_USERSPACE
&&
698 nla_is_last(a
, rem
)))
699 return output_userspace(dp
, skb
, key
, a
);
701 skb
= skb_clone(skb
, GFP_ATOMIC
);
703 /* Skip the sample action when out of memory. */
706 if (!add_deferred_actions(skb
, key
, a
)) {
708 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
716 static void execute_hash(struct sk_buff
*skb
, struct sw_flow_key
*key
,
717 const struct nlattr
*attr
)
719 struct ovs_action_hash
*hash_act
= nla_data(attr
);
722 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
723 hash
= skb_get_hash(skb
);
724 hash
= jhash_1word(hash
, hash_act
->hash_basis
);
728 key
->ovs_flow_hash
= hash
;
731 static int execute_set_action(struct sk_buff
*skb
, struct sw_flow_key
*key
,
732 const struct nlattr
*nested_attr
)
736 switch (nla_type(nested_attr
)) {
737 case OVS_KEY_ATTR_PRIORITY
:
738 skb
->priority
= nla_get_u32(nested_attr
);
739 key
->phy
.priority
= skb
->priority
;
742 case OVS_KEY_ATTR_SKB_MARK
:
743 skb
->mark
= nla_get_u32(nested_attr
);
744 key
->phy
.skb_mark
= skb
->mark
;
747 case OVS_KEY_ATTR_TUNNEL_INFO
:
748 OVS_CB(skb
)->egress_tun_info
= nla_data(nested_attr
);
751 case OVS_KEY_ATTR_ETHERNET
:
752 err
= set_eth_addr(skb
, key
, nla_data(nested_attr
));
755 case OVS_KEY_ATTR_IPV4
:
756 err
= set_ipv4(skb
, key
, nla_data(nested_attr
));
759 case OVS_KEY_ATTR_IPV6
:
760 err
= set_ipv6(skb
, key
, nla_data(nested_attr
));
763 case OVS_KEY_ATTR_TCP
:
764 err
= set_tcp(skb
, key
, nla_data(nested_attr
));
767 case OVS_KEY_ATTR_UDP
:
768 err
= set_udp(skb
, key
, nla_data(nested_attr
));
771 case OVS_KEY_ATTR_SCTP
:
772 err
= set_sctp(skb
, key
, nla_data(nested_attr
));
775 case OVS_KEY_ATTR_MPLS
:
776 err
= set_mpls(skb
, key
, nla_data(nested_attr
));
783 static int execute_recirc(struct datapath
*dp
, struct sk_buff
*skb
,
784 struct sw_flow_key
*key
,
785 const struct nlattr
*a
, int rem
)
787 struct deferred_action
*da
;
789 if (!is_flow_key_valid(key
)) {
792 err
= ovs_flow_key_update(skb
, key
);
796 BUG_ON(!is_flow_key_valid(key
));
798 if (!nla_is_last(a
, rem
)) {
799 /* Recirc action is the not the last action
800 * of the action list, need to clone the skb.
802 skb
= skb_clone(skb
, GFP_ATOMIC
);
804 /* Skip the recirc action when out of memory, but
805 * continue on with the rest of the action list.
811 da
= add_deferred_actions(skb
, key
, NULL
);
813 da
->pkt_key
.recirc_id
= nla_get_u32(a
);
818 pr_warn("%s: deferred action limit reached, drop recirc action\n",
825 /* Execute a list of actions against 'skb'. */
826 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
827 struct sw_flow_key
*key
,
828 const struct nlattr
*attr
, int len
)
830 /* Every output action needs a separate clone of 'skb', but the common
831 * case is just a single output action, so that doing a clone and
832 * then freeing the original skbuff is wasteful. So the following code
833 * is slightly obscure just to avoid that.
836 const struct nlattr
*a
;
839 for (a
= attr
, rem
= len
; rem
> 0;
840 a
= nla_next(a
, &rem
)) {
843 if (unlikely(prev_port
!= -1)) {
844 struct sk_buff
*out_skb
= skb_clone(skb
, GFP_ATOMIC
);
847 do_output(dp
, out_skb
, prev_port
);
852 switch (nla_type(a
)) {
853 case OVS_ACTION_ATTR_OUTPUT
:
854 prev_port
= nla_get_u32(a
);
857 case OVS_ACTION_ATTR_USERSPACE
:
858 output_userspace(dp
, skb
, key
, a
);
861 case OVS_ACTION_ATTR_HASH
:
862 execute_hash(skb
, key
, a
);
865 case OVS_ACTION_ATTR_PUSH_MPLS
:
866 err
= push_mpls(skb
, key
, nla_data(a
));
869 case OVS_ACTION_ATTR_POP_MPLS
:
870 err
= pop_mpls(skb
, key
, nla_get_be16(a
));
873 case OVS_ACTION_ATTR_PUSH_VLAN
:
874 err
= push_vlan(skb
, key
, nla_data(a
));
875 if (unlikely(err
)) /* skb already freed. */
879 case OVS_ACTION_ATTR_POP_VLAN
:
880 err
= pop_vlan(skb
, key
);
883 case OVS_ACTION_ATTR_RECIRC
:
884 err
= execute_recirc(dp
, skb
, key
, a
, rem
);
885 if (nla_is_last(a
, rem
)) {
886 /* If this is the last action, the skb has
887 * been consumed or freed.
888 * Return immediately.
894 case OVS_ACTION_ATTR_SET
:
895 err
= execute_set_action(skb
, key
, nla_data(a
));
898 case OVS_ACTION_ATTR_SAMPLE
:
899 err
= sample(dp
, skb
, key
, a
);
900 if (unlikely(err
)) /* skb already freed. */
912 do_output(dp
, skb
, prev_port
);
919 static void process_deferred_actions(struct datapath
*dp
)
921 struct action_fifo
*fifo
= this_cpu_ptr(action_fifos
);
923 /* Do not touch the FIFO in case there is no deferred actions. */
924 if (action_fifo_is_empty(fifo
))
927 /* Finishing executing all deferred actions. */
929 struct deferred_action
*da
= action_fifo_get(fifo
);
930 struct sk_buff
*skb
= da
->skb
;
931 struct sw_flow_key
*key
= &da
->pkt_key
;
932 const struct nlattr
*actions
= da
->actions
;
935 do_execute_actions(dp
, skb
, key
, actions
,
938 ovs_dp_process_packet(skb
, key
);
939 } while (!action_fifo_is_empty(fifo
));
941 /* Reset FIFO for the next packet. */
942 action_fifo_init(fifo
);
945 /* Execute a list of actions against 'skb'. */
946 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
947 const struct sw_flow_actions
*acts
,
948 struct sw_flow_key
*key
)
950 int level
= this_cpu_read(exec_actions_level
);
953 this_cpu_inc(exec_actions_level
);
954 OVS_CB(skb
)->egress_tun_info
= NULL
;
955 err
= do_execute_actions(dp
, skb
, key
,
956 acts
->actions
, acts
->actions_len
);
959 process_deferred_actions(dp
);
961 this_cpu_dec(exec_actions_level
);
965 int action_fifos_init(void)
967 action_fifos
= alloc_percpu(struct action_fifo
);
974 void action_fifos_exit(void)
976 free_percpu(action_fifos
);