2 * Copyright (c) 2007-2017 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/checksum.h>
37 #include <net/dsfield.h>
39 #include <net/sctp/checksum.h>
42 #include "conntrack.h"
45 #include "flow_netlink.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
;
56 /* Store pkt_key clone when creating deferred action. */
57 struct sw_flow_key pkt_key
;
60 #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
61 struct ovs_frag_data
{
65 __be16 inner_protocol
;
66 u16 network_offset
; /* valid only for MPLS */
71 u8 l2_data
[MAX_L2_LEN
];
74 static DEFINE_PER_CPU(struct ovs_frag_data
, ovs_frag_data_storage
);
76 #define DEFERRED_ACTION_FIFO_SIZE 10
77 #define OVS_RECURSION_LIMIT 4
78 #define OVS_DEFERRED_ACTION_THRESHOLD (OVS_RECURSION_LIMIT - 2)
82 /* Deferred action fifo queue storage. */
83 struct deferred_action fifo
[DEFERRED_ACTION_FIFO_SIZE
];
86 struct action_flow_keys
{
87 struct sw_flow_key key
[OVS_DEFERRED_ACTION_THRESHOLD
];
90 static struct action_fifo __percpu
*action_fifos
;
91 static struct action_flow_keys __percpu
*flow_keys
;
92 static DEFINE_PER_CPU(int, exec_actions_level
);
94 /* Make a clone of the 'key', using the pre-allocated percpu 'flow_keys'
95 * space. Return NULL if out of key spaces.
97 static struct sw_flow_key
*clone_key(const struct sw_flow_key
*key_
)
99 struct action_flow_keys
*keys
= this_cpu_ptr(flow_keys
);
100 int level
= this_cpu_read(exec_actions_level
);
101 struct sw_flow_key
*key
= NULL
;
103 if (level
<= OVS_DEFERRED_ACTION_THRESHOLD
) {
104 key
= &keys
->key
[level
- 1];
111 static void action_fifo_init(struct action_fifo
*fifo
)
117 static bool action_fifo_is_empty(const struct action_fifo
*fifo
)
119 return (fifo
->head
== fifo
->tail
);
122 static struct deferred_action
*action_fifo_get(struct action_fifo
*fifo
)
124 if (action_fifo_is_empty(fifo
))
127 return &fifo
->fifo
[fifo
->tail
++];
130 static struct deferred_action
*action_fifo_put(struct action_fifo
*fifo
)
132 if (fifo
->head
>= DEFERRED_ACTION_FIFO_SIZE
- 1)
135 return &fifo
->fifo
[fifo
->head
++];
138 /* Return queue entry if fifo is not full */
139 static struct deferred_action
*add_deferred_actions(struct sk_buff
*skb
,
140 const struct sw_flow_key
*key
,
141 const struct nlattr
*actions
,
142 const int actions_len
)
144 struct action_fifo
*fifo
;
145 struct deferred_action
*da
;
147 fifo
= this_cpu_ptr(action_fifos
);
148 da
= action_fifo_put(fifo
);
151 da
->actions
= actions
;
152 da
->actions_len
= actions_len
;
159 static void invalidate_flow_key(struct sw_flow_key
*key
)
161 key
->mac_proto
|= SW_FLOW_KEY_INVALID
;
164 static bool is_flow_key_valid(const struct sw_flow_key
*key
)
166 return !(key
->mac_proto
& SW_FLOW_KEY_INVALID
);
169 static int clone_execute(struct datapath
*dp
, struct sk_buff
*skb
,
170 struct sw_flow_key
*key
,
172 const struct nlattr
*actions
, int len
,
173 bool last
, bool clone_flow_key
);
175 static void update_ethertype(struct sk_buff
*skb
, struct ethhdr
*hdr
,
178 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
179 __be16 diff
[] = { ~(hdr
->h_proto
), ethertype
};
181 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
185 hdr
->h_proto
= ethertype
;
188 static int push_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
189 const struct ovs_action_push_mpls
*mpls
)
191 struct mpls_shim_hdr
*new_mpls_lse
;
193 /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
194 if (skb
->encapsulation
)
197 if (skb_cow_head(skb
, MPLS_HLEN
) < 0)
200 if (!ovs_skb_get_inner_protocol(skb
)) {
201 skb_set_inner_network_header(skb
, skb
->mac_len
);
202 ovs_skb_set_inner_protocol(skb
, skb
->protocol
);
205 skb_push(skb
, MPLS_HLEN
);
206 memmove(skb_mac_header(skb
) - MPLS_HLEN
, skb_mac_header(skb
),
208 skb_reset_mac_header(skb
);
209 #ifdef MPLS_HEADER_IS_L3
210 skb_set_network_header(skb
, skb
->mac_len
);
213 new_mpls_lse
= mpls_hdr(skb
);
214 new_mpls_lse
->label_stack_entry
= mpls
->mpls_lse
;
216 skb_postpush_rcsum(skb
, new_mpls_lse
, MPLS_HLEN
);
218 if (ovs_key_mac_proto(key
) == MAC_PROTO_ETHERNET
)
219 update_ethertype(skb
, eth_hdr(skb
), mpls
->mpls_ethertype
);
220 skb
->protocol
= mpls
->mpls_ethertype
;
222 invalidate_flow_key(key
);
226 static int pop_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
227 const __be16 ethertype
)
231 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
235 skb_postpull_rcsum(skb
, mpls_hdr(skb
), MPLS_HLEN
);
237 memmove(skb_mac_header(skb
) + MPLS_HLEN
, skb_mac_header(skb
),
240 __skb_pull(skb
, MPLS_HLEN
);
241 skb_reset_mac_header(skb
);
242 skb_set_network_header(skb
, skb
->mac_len
);
244 if (ovs_key_mac_proto(key
) == MAC_PROTO_ETHERNET
) {
247 /* mpls_hdr() is used to locate the ethertype
248 * field correctly in the presence of VLAN tags.
250 hdr
= (struct ethhdr
*)((void*)mpls_hdr(skb
) - ETH_HLEN
);
251 update_ethertype(skb
, hdr
, ethertype
);
253 if (eth_p_mpls(skb
->protocol
))
254 skb
->protocol
= ethertype
;
256 invalidate_flow_key(key
);
260 static int set_mpls(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
261 const __be32
*mpls_lse
, const __be32
*mask
)
263 struct mpls_shim_hdr
*stack
;
267 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
271 stack
= mpls_hdr(skb
);
272 lse
= OVS_MASKED(stack
->label_stack_entry
, *mpls_lse
, *mask
);
273 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
274 __be32 diff
[] = { ~(stack
->label_stack_entry
), lse
};
276 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
280 stack
->label_stack_entry
= lse
;
281 flow_key
->mpls
.top_lse
= lse
;
285 static int pop_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
289 err
= skb_vlan_pop(skb
);
290 if (skb_vlan_tag_present(skb
)) {
291 invalidate_flow_key(key
);
293 key
->eth
.vlan
.tci
= 0;
294 key
->eth
.vlan
.tpid
= 0;
299 static int push_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
,
300 const struct ovs_action_push_vlan
*vlan
)
302 if (skb_vlan_tag_present(skb
)) {
303 invalidate_flow_key(key
);
305 key
->eth
.vlan
.tci
= vlan
->vlan_tci
;
306 key
->eth
.vlan
.tpid
= vlan
->vlan_tpid
;
308 return skb_vlan_push(skb
, vlan
->vlan_tpid
,
309 ntohs(vlan
->vlan_tci
) & ~VLAN_TAG_PRESENT
);
312 /* 'src' is already properly masked. */
313 static void ether_addr_copy_masked(u8
*dst_
, const u8
*src_
, const u8
*mask_
)
315 u16
*dst
= (u16
*)dst_
;
316 const u16
*src
= (const u16
*)src_
;
317 const u16
*mask
= (const u16
*)mask_
;
319 OVS_SET_MASKED(dst
[0], src
[0], mask
[0]);
320 OVS_SET_MASKED(dst
[1], src
[1], mask
[1]);
321 OVS_SET_MASKED(dst
[2], src
[2], mask
[2]);
324 static int set_eth_addr(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
325 const struct ovs_key_ethernet
*key
,
326 const struct ovs_key_ethernet
*mask
)
330 err
= skb_ensure_writable(skb
, ETH_HLEN
);
334 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
336 ether_addr_copy_masked(eth_hdr(skb
)->h_source
, key
->eth_src
,
338 ether_addr_copy_masked(eth_hdr(skb
)->h_dest
, key
->eth_dst
,
341 skb_postpush_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
343 ether_addr_copy(flow_key
->eth
.src
, eth_hdr(skb
)->h_source
);
344 ether_addr_copy(flow_key
->eth
.dst
, eth_hdr(skb
)->h_dest
);
348 /* pop_eth does not support VLAN packets as this action is never called
351 static int pop_eth(struct sk_buff
*skb
, struct sw_flow_key
*key
)
353 skb_pull_rcsum(skb
, ETH_HLEN
);
354 skb_reset_mac_header(skb
);
355 skb_reset_mac_len(skb
);
357 /* safe right before invalidate_flow_key */
358 key
->mac_proto
= MAC_PROTO_NONE
;
359 invalidate_flow_key(key
);
363 static int push_eth(struct sk_buff
*skb
, struct sw_flow_key
*key
,
364 const struct ovs_action_push_eth
*ethh
)
368 /* Add the new Ethernet header */
369 if (skb_cow_head(skb
, ETH_HLEN
) < 0)
372 skb_push(skb
, ETH_HLEN
);
373 skb_reset_mac_header(skb
);
374 skb_reset_mac_len(skb
);
377 ether_addr_copy(hdr
->h_source
, ethh
->addresses
.eth_src
);
378 ether_addr_copy(hdr
->h_dest
, ethh
->addresses
.eth_dst
);
379 hdr
->h_proto
= skb
->protocol
;
381 skb_postpush_rcsum(skb
, hdr
, ETH_HLEN
);
383 /* safe right before invalidate_flow_key */
384 key
->mac_proto
= MAC_PROTO_ETHERNET
;
385 invalidate_flow_key(key
);
389 static int push_nsh(struct sk_buff
*skb
, struct sw_flow_key
*key
,
390 const struct nshhdr
*nh
)
394 err
= ovs_nsh_push(skb
, nh
);
398 /* safe right before invalidate_flow_key */
399 key
->mac_proto
= MAC_PROTO_NONE
;
400 invalidate_flow_key(key
);
404 static int pop_nsh(struct sk_buff
*skb
, struct sw_flow_key
*key
)
408 err
= ovs_nsh_pop(skb
);
412 /* safe right before invalidate_flow_key */
413 if (skb
->protocol
== htons(ETH_P_TEB
))
414 key
->mac_proto
= MAC_PROTO_ETHERNET
;
416 key
->mac_proto
= MAC_PROTO_NONE
;
417 invalidate_flow_key(key
);
421 static void update_ip_l4_checksum(struct sk_buff
*skb
, struct iphdr
*nh
,
422 __be32 addr
, __be32 new_addr
)
424 int transport_len
= skb
->len
- skb_transport_offset(skb
);
426 if (nh
->frag_off
& htons(IP_OFFSET
))
429 if (nh
->protocol
== IPPROTO_TCP
) {
430 if (likely(transport_len
>= sizeof(struct tcphdr
)))
431 inet_proto_csum_replace4(&tcp_hdr(skb
)->check
, skb
,
432 addr
, new_addr
, true);
433 } else if (nh
->protocol
== IPPROTO_UDP
) {
434 if (likely(transport_len
>= sizeof(struct udphdr
))) {
435 struct udphdr
*uh
= udp_hdr(skb
);
437 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
438 inet_proto_csum_replace4(&uh
->check
, skb
,
439 addr
, new_addr
, true);
441 uh
->check
= CSUM_MANGLED_0
;
448 static void set_ip_addr(struct sk_buff
*skb
, struct iphdr
*nh
,
449 __be32
*addr
, __be32 new_addr
)
451 update_ip_l4_checksum(skb
, nh
, *addr
, new_addr
);
452 csum_replace4(&nh
->check
, *addr
, new_addr
);
457 static void update_ipv6_checksum(struct sk_buff
*skb
, u8 l4_proto
,
458 __be32 addr
[4], const __be32 new_addr
[4])
460 int transport_len
= skb
->len
- skb_transport_offset(skb
);
462 if (l4_proto
== NEXTHDR_TCP
) {
463 if (likely(transport_len
>= sizeof(struct tcphdr
)))
464 inet_proto_csum_replace16(&tcp_hdr(skb
)->check
, skb
,
465 addr
, new_addr
, true);
466 } else if (l4_proto
== NEXTHDR_UDP
) {
467 if (likely(transport_len
>= sizeof(struct udphdr
))) {
468 struct udphdr
*uh
= udp_hdr(skb
);
470 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
471 inet_proto_csum_replace16(&uh
->check
, skb
,
472 addr
, new_addr
, true);
474 uh
->check
= CSUM_MANGLED_0
;
477 } else if (l4_proto
== NEXTHDR_ICMP
) {
478 if (likely(transport_len
>= sizeof(struct icmp6hdr
)))
479 inet_proto_csum_replace16(&icmp6_hdr(skb
)->icmp6_cksum
,
480 skb
, addr
, new_addr
, true);
484 static void mask_ipv6_addr(const __be32 old
[4], const __be32 addr
[4],
485 const __be32 mask
[4], __be32 masked
[4])
487 masked
[0] = OVS_MASKED(old
[0], addr
[0], mask
[0]);
488 masked
[1] = OVS_MASKED(old
[1], addr
[1], mask
[1]);
489 masked
[2] = OVS_MASKED(old
[2], addr
[2], mask
[2]);
490 masked
[3] = OVS_MASKED(old
[3], addr
[3], mask
[3]);
493 static void set_ipv6_addr(struct sk_buff
*skb
, u8 l4_proto
,
494 __be32 addr
[4], const __be32 new_addr
[4],
495 bool recalculate_csum
)
497 if (likely(recalculate_csum
))
498 update_ipv6_checksum(skb
, l4_proto
, addr
, new_addr
);
501 memcpy(addr
, new_addr
, sizeof(__be32
[4]));
504 static void set_ipv6_fl(struct ipv6hdr
*nh
, u32 fl
, u32 mask
)
506 /* Bits 21-24 are always unmasked, so this retains their values. */
507 OVS_SET_MASKED(nh
->flow_lbl
[0], (u8
)(fl
>> 16), (u8
)(mask
>> 16));
508 OVS_SET_MASKED(nh
->flow_lbl
[1], (u8
)(fl
>> 8), (u8
)(mask
>> 8));
509 OVS_SET_MASKED(nh
->flow_lbl
[2], (u8
)fl
, (u8
)mask
);
512 static void set_ip_ttl(struct sk_buff
*skb
, struct iphdr
*nh
, u8 new_ttl
,
515 new_ttl
= OVS_MASKED(nh
->ttl
, new_ttl
, mask
);
517 csum_replace2(&nh
->check
, htons(nh
->ttl
<< 8), htons(new_ttl
<< 8));
521 static int set_ipv4(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
522 const struct ovs_key_ipv4
*key
,
523 const struct ovs_key_ipv4
*mask
)
529 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
530 sizeof(struct iphdr
));
536 /* Setting an IP addresses is typically only a side effect of
537 * matching on them in the current userspace implementation, so it
538 * makes sense to check if the value actually changed.
540 if (mask
->ipv4_src
) {
541 new_addr
= OVS_MASKED(nh
->saddr
, key
->ipv4_src
, mask
->ipv4_src
);
543 if (unlikely(new_addr
!= nh
->saddr
)) {
544 set_ip_addr(skb
, nh
, &nh
->saddr
, new_addr
);
545 flow_key
->ipv4
.addr
.src
= new_addr
;
548 if (mask
->ipv4_dst
) {
549 new_addr
= OVS_MASKED(nh
->daddr
, key
->ipv4_dst
, mask
->ipv4_dst
);
551 if (unlikely(new_addr
!= nh
->daddr
)) {
552 set_ip_addr(skb
, nh
, &nh
->daddr
, new_addr
);
553 flow_key
->ipv4
.addr
.dst
= new_addr
;
556 if (mask
->ipv4_tos
) {
557 ipv4_change_dsfield(nh
, ~mask
->ipv4_tos
, key
->ipv4_tos
);
558 flow_key
->ip
.tos
= nh
->tos
;
560 if (mask
->ipv4_ttl
) {
561 set_ip_ttl(skb
, nh
, key
->ipv4_ttl
, mask
->ipv4_ttl
);
562 flow_key
->ip
.ttl
= nh
->ttl
;
568 static bool is_ipv6_mask_nonzero(const __be32 addr
[4])
570 return !!(addr
[0] | addr
[1] | addr
[2] | addr
[3]);
573 static int set_ipv6(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
574 const struct ovs_key_ipv6
*key
,
575 const struct ovs_key_ipv6
*mask
)
580 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
581 sizeof(struct ipv6hdr
));
587 /* Setting an IP addresses is typically only a side effect of
588 * matching on them in the current userspace implementation, so it
589 * makes sense to check if the value actually changed.
591 if (is_ipv6_mask_nonzero(mask
->ipv6_src
)) {
592 __be32
*saddr
= (__be32
*)&nh
->saddr
;
595 mask_ipv6_addr(saddr
, key
->ipv6_src
, mask
->ipv6_src
, masked
);
597 if (unlikely(memcmp(saddr
, masked
, sizeof(masked
)))) {
598 set_ipv6_addr(skb
, flow_key
->ip
.proto
, saddr
, masked
,
600 memcpy(&flow_key
->ipv6
.addr
.src
, masked
,
601 sizeof(flow_key
->ipv6
.addr
.src
));
604 if (is_ipv6_mask_nonzero(mask
->ipv6_dst
)) {
605 unsigned int offset
= 0;
606 int flags
= IP6_FH_F_SKIP_RH
;
607 bool recalc_csum
= true;
608 __be32
*daddr
= (__be32
*)&nh
->daddr
;
611 mask_ipv6_addr(daddr
, key
->ipv6_dst
, mask
->ipv6_dst
, masked
);
613 if (unlikely(memcmp(daddr
, masked
, sizeof(masked
)))) {
614 if (ipv6_ext_hdr(nh
->nexthdr
))
615 recalc_csum
= (ipv6_find_hdr(skb
, &offset
,
620 set_ipv6_addr(skb
, flow_key
->ip
.proto
, daddr
, masked
,
622 memcpy(&flow_key
->ipv6
.addr
.dst
, masked
,
623 sizeof(flow_key
->ipv6
.addr
.dst
));
626 if (mask
->ipv6_tclass
) {
627 ipv6_change_dsfield(nh
, ~mask
->ipv6_tclass
, key
->ipv6_tclass
);
628 flow_key
->ip
.tos
= ipv6_get_dsfield(nh
);
630 if (mask
->ipv6_label
) {
631 set_ipv6_fl(nh
, ntohl(key
->ipv6_label
),
632 ntohl(mask
->ipv6_label
));
633 flow_key
->ipv6
.label
=
634 *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
636 if (mask
->ipv6_hlimit
) {
637 OVS_SET_MASKED(nh
->hop_limit
, key
->ipv6_hlimit
,
639 flow_key
->ip
.ttl
= nh
->hop_limit
;
644 static int set_nsh(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
645 const struct nlattr
*a
)
654 struct ovs_key_nsh key
;
655 struct ovs_key_nsh mask
;
657 err
= nsh_key_from_nlattr(a
, &key
, &mask
);
661 /* Make sure the NSH base header is there */
662 if (!pskb_may_pull(skb
, skb_network_offset(skb
) + NSH_BASE_HDR_LEN
))
666 length
= nsh_hdr_len(nh
);
668 /* Make sure the whole NSH header is there */
669 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
675 skb_postpull_rcsum(skb
, nh
, length
);
676 flags
= nsh_get_flags(nh
);
677 flags
= OVS_MASKED(flags
, key
.base
.flags
, mask
.base
.flags
);
678 flow_key
->nsh
.base
.flags
= flags
;
679 ttl
= nsh_get_ttl(nh
);
680 ttl
= OVS_MASKED(ttl
, key
.base
.ttl
, mask
.base
.ttl
);
681 flow_key
->nsh
.base
.ttl
= ttl
;
682 nsh_set_flags_and_ttl(nh
, flags
, ttl
);
683 nh
->path_hdr
= OVS_MASKED(nh
->path_hdr
, key
.base
.path_hdr
,
685 flow_key
->nsh
.base
.path_hdr
= nh
->path_hdr
;
686 switch (nh
->mdtype
) {
688 for (i
= 0; i
< NSH_MD1_CONTEXT_SIZE
; i
++) {
690 OVS_MASKED(nh
->md1
.context
[i
], key
.context
[i
],
693 memcpy(flow_key
->nsh
.context
, nh
->md1
.context
,
694 sizeof(nh
->md1
.context
));
697 memset(flow_key
->nsh
.context
, 0,
698 sizeof(flow_key
->nsh
.context
));
703 skb_postpush_rcsum(skb
, nh
, length
);
707 /* Must follow skb_ensure_writable() since that can move the skb data. */
708 static void set_tp_port(struct sk_buff
*skb
, __be16
*port
,
709 __be16 new_port
, __sum16
*check
)
711 inet_proto_csum_replace2(check
, skb
, *port
, new_port
, false);
715 static int set_udp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
716 const struct ovs_key_udp
*key
,
717 const struct ovs_key_udp
*mask
)
723 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
724 sizeof(struct udphdr
));
729 /* Either of the masks is non-zero, so do not bother checking them. */
730 src
= OVS_MASKED(uh
->source
, key
->udp_src
, mask
->udp_src
);
731 dst
= OVS_MASKED(uh
->dest
, key
->udp_dst
, mask
->udp_dst
);
733 if (uh
->check
&& skb
->ip_summed
!= CHECKSUM_PARTIAL
) {
734 if (likely(src
!= uh
->source
)) {
735 set_tp_port(skb
, &uh
->source
, src
, &uh
->check
);
736 flow_key
->tp
.src
= src
;
738 if (likely(dst
!= uh
->dest
)) {
739 set_tp_port(skb
, &uh
->dest
, dst
, &uh
->check
);
740 flow_key
->tp
.dst
= dst
;
743 if (unlikely(!uh
->check
))
744 uh
->check
= CSUM_MANGLED_0
;
748 flow_key
->tp
.src
= src
;
749 flow_key
->tp
.dst
= dst
;
757 static int set_tcp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
758 const struct ovs_key_tcp
*key
,
759 const struct ovs_key_tcp
*mask
)
765 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
766 sizeof(struct tcphdr
));
771 src
= OVS_MASKED(th
->source
, key
->tcp_src
, mask
->tcp_src
);
772 if (likely(src
!= th
->source
)) {
773 set_tp_port(skb
, &th
->source
, src
, &th
->check
);
774 flow_key
->tp
.src
= src
;
776 dst
= OVS_MASKED(th
->dest
, key
->tcp_dst
, mask
->tcp_dst
);
777 if (likely(dst
!= th
->dest
)) {
778 set_tp_port(skb
, &th
->dest
, dst
, &th
->check
);
779 flow_key
->tp
.dst
= dst
;
786 static int set_sctp(struct sk_buff
*skb
, struct sw_flow_key
*flow_key
,
787 const struct ovs_key_sctp
*key
,
788 const struct ovs_key_sctp
*mask
)
790 unsigned int sctphoff
= skb_transport_offset(skb
);
792 __le32 old_correct_csum
, new_csum
, old_csum
;
795 err
= skb_ensure_writable(skb
, sctphoff
+ sizeof(struct sctphdr
));
800 old_csum
= sh
->checksum
;
801 old_correct_csum
= sctp_compute_cksum(skb
, sctphoff
);
803 sh
->source
= OVS_MASKED(sh
->source
, key
->sctp_src
, mask
->sctp_src
);
804 sh
->dest
= OVS_MASKED(sh
->dest
, key
->sctp_dst
, mask
->sctp_dst
);
806 new_csum
= sctp_compute_cksum(skb
, sctphoff
);
808 /* Carry any checksum errors through. */
809 sh
->checksum
= old_csum
^ old_correct_csum
^ new_csum
;
812 flow_key
->tp
.src
= sh
->source
;
813 flow_key
->tp
.dst
= sh
->dest
;
818 static int ovs_vport_output(OVS_VPORT_OUTPUT_PARAMS
)
820 struct ovs_frag_data
*data
= this_cpu_ptr(&ovs_frag_data_storage
);
821 struct vport
*vport
= data
->vport
;
823 if (skb_cow_head(skb
, data
->l2_len
) < 0) {
828 __skb_dst_copy(skb
, data
->dst
);
829 *OVS_GSO_CB(skb
) = data
->cb
;
830 ovs_skb_set_inner_protocol(skb
, data
->inner_protocol
);
831 skb
->vlan_tci
= data
->vlan_tci
;
832 skb
->vlan_proto
= data
->vlan_proto
;
834 /* Reconstruct the MAC header. */
835 skb_push(skb
, data
->l2_len
);
836 memcpy(skb
->data
, &data
->l2_data
, data
->l2_len
);
837 skb_postpush_rcsum(skb
, skb
->data
, data
->l2_len
);
838 skb_reset_mac_header(skb
);
840 if (eth_p_mpls(skb
->protocol
)) {
841 skb
->inner_network_header
= skb
->network_header
;
842 skb_set_network_header(skb
, data
->network_offset
);
843 skb_reset_mac_len(skb
);
846 ovs_vport_send(vport
, skb
, data
->mac_proto
);
851 ovs_dst_get_mtu(const struct dst_entry
*dst
)
853 return dst
->dev
->mtu
;
856 static struct dst_ops ovs_dst_ops
= {
858 .mtu
= ovs_dst_get_mtu
,
861 /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
862 * ovs_vport_output(), which is called once per fragmented packet.
864 static void prepare_frag(struct vport
*vport
, struct sk_buff
*skb
,
865 u16 orig_network_offset
, u8 mac_proto
)
867 unsigned int hlen
= skb_network_offset(skb
);
868 struct ovs_frag_data
*data
;
870 data
= this_cpu_ptr(&ovs_frag_data_storage
);
871 data
->dst
= (unsigned long) skb_dst(skb
);
873 data
->cb
= *OVS_GSO_CB(skb
);
874 data
->inner_protocol
= ovs_skb_get_inner_protocol(skb
);
875 data
->network_offset
= orig_network_offset
;
876 data
->vlan_tci
= skb
->vlan_tci
;
877 data
->vlan_proto
= skb
->vlan_proto
;
878 data
->mac_proto
= mac_proto
;
880 memcpy(&data
->l2_data
, skb
->data
, hlen
);
882 memset(IPCB(skb
), 0, sizeof(struct inet_skb_parm
));
886 static void ovs_fragment(struct net
*net
, struct vport
*vport
,
887 struct sk_buff
*skb
, u16 mru
,
888 struct sw_flow_key
*key
)
890 u16 orig_network_offset
= 0;
892 if (eth_p_mpls(skb
->protocol
)) {
893 orig_network_offset
= skb_network_offset(skb
);
894 skb
->network_header
= skb
->inner_network_header
;
897 if (skb_network_offset(skb
) > MAX_L2_LEN
) {
898 OVS_NLERR(1, "L2 header too long to fragment");
902 if (key
->eth
.type
== htons(ETH_P_IP
)) {
903 struct dst_entry ovs_dst
;
904 unsigned long orig_dst
;
906 prepare_frag(vport
, skb
, orig_network_offset
,
907 ovs_key_mac_proto(key
));
908 dst_init(&ovs_dst
, &ovs_dst_ops
, NULL
, 1,
909 DST_OBSOLETE_NONE
, DST_NOCOUNT
);
910 ovs_dst
.dev
= vport
->dev
;
912 orig_dst
= (unsigned long) skb_dst(skb
);
913 skb_dst_set_noref(skb
, &ovs_dst
);
914 IPCB(skb
)->frag_max_size
= mru
;
916 ip_do_fragment(net
, skb
->sk
, skb
, ovs_vport_output
);
917 refdst_drop(orig_dst
);
918 } else if (key
->eth
.type
== htons(ETH_P_IPV6
)) {
919 const struct nf_ipv6_ops
*v6ops
= nf_get_ipv6_ops();
920 unsigned long orig_dst
;
921 struct rt6_info ovs_rt
;
926 prepare_frag(vport
, skb
, orig_network_offset
,
927 ovs_key_mac_proto(key
));
928 memset(&ovs_rt
, 0, sizeof(ovs_rt
));
929 dst_init(&ovs_rt
.dst
, &ovs_dst_ops
, NULL
, 1,
930 DST_OBSOLETE_NONE
, DST_NOCOUNT
);
931 ovs_rt
.dst
.dev
= vport
->dev
;
933 orig_dst
= (unsigned long) skb_dst(skb
);
934 skb_dst_set_noref(skb
, &ovs_rt
.dst
);
935 IP6CB(skb
)->frag_max_size
= mru
;
936 #ifdef HAVE_IP_LOCAL_OUT_TAKES_NET
937 v6ops
->fragment(net
, skb
->sk
, skb
, ovs_vport_output
);
939 v6ops
->fragment(skb
->sk
, skb
, ovs_vport_output
);
941 refdst_drop(orig_dst
);
943 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
944 ovs_vport_name(vport
), ntohs(key
->eth
.type
), mru
,
954 static void do_output(struct datapath
*dp
, struct sk_buff
*skb
, int out_port
,
955 struct sw_flow_key
*key
)
957 struct vport
*vport
= ovs_vport_rcu(dp
, out_port
);
960 u16 mru
= OVS_CB(skb
)->mru
;
961 u32 cutlen
= OVS_CB(skb
)->cutlen
;
963 if (unlikely(cutlen
> 0)) {
964 if (skb
->len
- cutlen
> ovs_mac_header_len(key
))
965 pskb_trim(skb
, skb
->len
- cutlen
);
967 pskb_trim(skb
, ovs_mac_header_len(key
));
971 (skb
->len
<= mru
+ vport
->dev
->hard_header_len
))) {
972 ovs_vport_send(vport
, skb
, ovs_key_mac_proto(key
));
973 } else if (mru
<= vport
->dev
->mtu
) {
974 struct net
*net
= ovs_dp_get_net(dp
);
976 ovs_fragment(net
, vport
, skb
, mru
, key
);
978 OVS_NLERR(true, "Cannot fragment IP frames");
986 static int output_userspace(struct datapath
*dp
, struct sk_buff
*skb
,
987 struct sw_flow_key
*key
, const struct nlattr
*attr
,
988 const struct nlattr
*actions
, int actions_len
,
991 struct dp_upcall_info upcall
;
992 const struct nlattr
*a
;
995 memset(&upcall
, 0, sizeof(upcall
));
996 upcall
.cmd
= OVS_PACKET_CMD_ACTION
;
997 upcall
.mru
= OVS_CB(skb
)->mru
;
999 SKB_INIT_FILL_METADATA_DST(skb
);
1000 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
1001 a
= nla_next(a
, &rem
)) {
1002 switch (nla_type(a
)) {
1003 case OVS_USERSPACE_ATTR_USERDATA
:
1004 upcall
.userdata
= a
;
1007 case OVS_USERSPACE_ATTR_PID
:
1008 upcall
.portid
= nla_get_u32(a
);
1011 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT
: {
1012 /* Get out tunnel info. */
1013 struct vport
*vport
;
1015 vport
= ovs_vport_rcu(dp
, nla_get_u32(a
));
1017 err
= dev_fill_metadata_dst(vport
->dev
, skb
);
1019 upcall
.egress_tun_info
= skb_tunnel_info(skb
);
1025 case OVS_USERSPACE_ATTR_ACTIONS
: {
1026 /* Include actions. */
1027 upcall
.actions
= actions
;
1028 upcall
.actions_len
= actions_len
;
1032 } /* End of switch. */
1035 err
= ovs_dp_upcall(dp
, skb
, key
, &upcall
, cutlen
);
1036 SKB_RESTORE_FILL_METADATA_DST(skb
);
1040 /* When 'last' is true, sample() should always consume the 'skb'.
1041 * Otherwise, sample() should keep 'skb' intact regardless what
1042 * actions are executed within sample().
1044 static int sample(struct datapath
*dp
, struct sk_buff
*skb
,
1045 struct sw_flow_key
*key
, const struct nlattr
*attr
,
1048 struct nlattr
*actions
;
1049 struct nlattr
*sample_arg
;
1050 int rem
= nla_len(attr
);
1051 const struct sample_arg
*arg
;
1052 bool clone_flow_key
;
1054 /* The first action is always 'OVS_SAMPLE_ATTR_ARG'. */
1055 sample_arg
= nla_data(attr
);
1056 arg
= nla_data(sample_arg
);
1057 actions
= nla_next(sample_arg
, &rem
);
1059 if ((arg
->probability
!= U32_MAX
) &&
1060 (!arg
->probability
|| prandom_u32() > arg
->probability
)) {
1066 clone_flow_key
= !arg
->exec
;
1067 return clone_execute(dp
, skb
, key
, 0, actions
, rem
, last
,
1071 static void execute_hash(struct sk_buff
*skb
, struct sw_flow_key
*key
,
1072 const struct nlattr
*attr
)
1074 struct ovs_action_hash
*hash_act
= nla_data(attr
);
1077 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
1078 hash
= skb_get_hash(skb
);
1079 hash
= jhash_1word(hash
, hash_act
->hash_basis
);
1083 key
->ovs_flow_hash
= hash
;
1086 static int execute_set_action(struct sk_buff
*skb
,
1087 struct sw_flow_key
*flow_key
,
1088 const struct nlattr
*a
)
1090 /* Only tunnel set execution is supported without a mask. */
1091 if (nla_type(a
) == OVS_KEY_ATTR_TUNNEL_INFO
) {
1092 struct ovs_tunnel_info
*tun
= nla_data(a
);
1094 ovs_skb_dst_drop(skb
);
1095 ovs_dst_hold((struct dst_entry
*)tun
->tun_dst
);
1096 ovs_skb_dst_set(skb
, (struct dst_entry
*)tun
->tun_dst
);
1103 /* Mask is at the midpoint of the data. */
1104 #define get_mask(a, type) ((const type)nla_data(a) + 1)
1106 static int execute_masked_set_action(struct sk_buff
*skb
,
1107 struct sw_flow_key
*flow_key
,
1108 const struct nlattr
*a
)
1112 switch (nla_type(a
)) {
1113 case OVS_KEY_ATTR_PRIORITY
:
1114 OVS_SET_MASKED(skb
->priority
, nla_get_u32(a
),
1115 *get_mask(a
, u32
*));
1116 flow_key
->phy
.priority
= skb
->priority
;
1119 case OVS_KEY_ATTR_SKB_MARK
:
1120 OVS_SET_MASKED(skb
->mark
, nla_get_u32(a
), *get_mask(a
, u32
*));
1121 flow_key
->phy
.skb_mark
= skb
->mark
;
1124 case OVS_KEY_ATTR_TUNNEL_INFO
:
1125 /* Masked data not supported for tunnel. */
1129 case OVS_KEY_ATTR_ETHERNET
:
1130 err
= set_eth_addr(skb
, flow_key
, nla_data(a
),
1131 get_mask(a
, struct ovs_key_ethernet
*));
1134 case OVS_KEY_ATTR_NSH
:
1135 err
= set_nsh(skb
, flow_key
, a
);
1138 case OVS_KEY_ATTR_IPV4
:
1139 err
= set_ipv4(skb
, flow_key
, nla_data(a
),
1140 get_mask(a
, struct ovs_key_ipv4
*));
1143 case OVS_KEY_ATTR_IPV6
:
1144 err
= set_ipv6(skb
, flow_key
, nla_data(a
),
1145 get_mask(a
, struct ovs_key_ipv6
*));
1148 case OVS_KEY_ATTR_TCP
:
1149 err
= set_tcp(skb
, flow_key
, nla_data(a
),
1150 get_mask(a
, struct ovs_key_tcp
*));
1153 case OVS_KEY_ATTR_UDP
:
1154 err
= set_udp(skb
, flow_key
, nla_data(a
),
1155 get_mask(a
, struct ovs_key_udp
*));
1158 case OVS_KEY_ATTR_SCTP
:
1159 err
= set_sctp(skb
, flow_key
, nla_data(a
),
1160 get_mask(a
, struct ovs_key_sctp
*));
1163 case OVS_KEY_ATTR_MPLS
:
1164 err
= set_mpls(skb
, flow_key
, nla_data(a
), get_mask(a
,
1168 case OVS_KEY_ATTR_CT_STATE
:
1169 case OVS_KEY_ATTR_CT_ZONE
:
1170 case OVS_KEY_ATTR_CT_MARK
:
1171 case OVS_KEY_ATTR_CT_LABELS
:
1172 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4
:
1173 case OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6
:
1181 static int execute_recirc(struct datapath
*dp
, struct sk_buff
*skb
,
1182 struct sw_flow_key
*key
,
1183 const struct nlattr
*a
, bool last
)
1187 if (!is_flow_key_valid(key
)) {
1190 err
= ovs_flow_key_update(skb
, key
);
1194 BUG_ON(!is_flow_key_valid(key
));
1196 recirc_id
= nla_get_u32(a
);
1197 return clone_execute(dp
, skb
, key
, recirc_id
, NULL
, 0, last
, true);
1200 /* Execute a list of actions against 'skb'. */
1201 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
1202 struct sw_flow_key
*key
,
1203 const struct nlattr
*attr
, int len
)
1205 const struct nlattr
*a
;
1208 for (a
= attr
, rem
= len
; rem
> 0;
1209 a
= nla_next(a
, &rem
)) {
1212 switch (nla_type(a
)) {
1213 case OVS_ACTION_ATTR_OUTPUT
: {
1214 int port
= nla_get_u32(a
);
1215 struct sk_buff
*clone
;
1217 /* Every output action needs a separate clone
1218 * of 'skb', In case the output action is the
1219 * last action, cloning can be avoided.
1221 if (nla_is_last(a
, rem
)) {
1222 do_output(dp
, skb
, port
, key
);
1223 /* 'skb' has been used for output.
1228 clone
= skb_clone(skb
, GFP_ATOMIC
);
1230 do_output(dp
, clone
, port
, key
);
1231 OVS_CB(skb
)->cutlen
= 0;
1235 case OVS_ACTION_ATTR_TRUNC
: {
1236 struct ovs_action_trunc
*trunc
= nla_data(a
);
1238 if (skb
->len
> trunc
->max_len
)
1239 OVS_CB(skb
)->cutlen
= skb
->len
- trunc
->max_len
;
1243 case OVS_ACTION_ATTR_USERSPACE
:
1244 output_userspace(dp
, skb
, key
, a
, attr
,
1245 len
, OVS_CB(skb
)->cutlen
);
1246 OVS_CB(skb
)->cutlen
= 0;
1249 case OVS_ACTION_ATTR_HASH
:
1250 execute_hash(skb
, key
, a
);
1253 case OVS_ACTION_ATTR_PUSH_MPLS
:
1254 err
= push_mpls(skb
, key
, nla_data(a
));
1257 case OVS_ACTION_ATTR_POP_MPLS
:
1258 err
= pop_mpls(skb
, key
, nla_get_be16(a
));
1261 case OVS_ACTION_ATTR_PUSH_VLAN
:
1262 err
= push_vlan(skb
, key
, nla_data(a
));
1265 case OVS_ACTION_ATTR_POP_VLAN
:
1266 err
= pop_vlan(skb
, key
);
1269 case OVS_ACTION_ATTR_RECIRC
: {
1270 bool last
= nla_is_last(a
, rem
);
1272 err
= execute_recirc(dp
, skb
, key
, a
, last
);
1274 /* If this is the last action, the skb has
1275 * been consumed or freed.
1276 * Return immediately.
1283 case OVS_ACTION_ATTR_SET
:
1284 err
= execute_set_action(skb
, key
, nla_data(a
));
1287 case OVS_ACTION_ATTR_SET_MASKED
:
1288 case OVS_ACTION_ATTR_SET_TO_MASKED
:
1289 err
= execute_masked_set_action(skb
, key
, nla_data(a
));
1292 case OVS_ACTION_ATTR_SAMPLE
: {
1293 bool last
= nla_is_last(a
, rem
);
1295 err
= sample(dp
, skb
, key
, a
, last
);
1302 case OVS_ACTION_ATTR_CT
:
1303 if (!is_flow_key_valid(key
)) {
1304 err
= ovs_flow_key_update(skb
, key
);
1309 err
= ovs_ct_execute(ovs_dp_get_net(dp
), skb
, key
,
1312 /* Hide stolen IP fragments from user space. */
1314 return err
== -EINPROGRESS
? 0 : err
;
1317 case OVS_ACTION_ATTR_CT_CLEAR
:
1318 err
= ovs_ct_clear(skb
, key
);
1321 case OVS_ACTION_ATTR_PUSH_ETH
:
1322 err
= push_eth(skb
, key
, nla_data(a
));
1325 case OVS_ACTION_ATTR_POP_ETH
:
1326 err
= pop_eth(skb
, key
);
1329 case OVS_ACTION_ATTR_PUSH_NSH
: {
1330 u8 buffer
[NSH_HDR_MAX_LEN
];
1331 struct nshhdr
*nh
= (struct nshhdr
*)buffer
;
1333 err
= nsh_hdr_from_nlattr(nla_data(a
), nh
,
1337 err
= push_nsh(skb
, key
, nh
);
1341 case OVS_ACTION_ATTR_POP_NSH
:
1342 err
= pop_nsh(skb
, key
);
1345 case OVS_ACTION_ATTR_METER
:
1346 if (ovs_meter_execute(dp
, skb
, key
, nla_get_u32(a
))) {
1352 if (unlikely(err
)) {
1362 /* Execute the actions on the clone of the packet. The effect of the
1363 * execution does not affect the original 'skb' nor the original 'key'.
1365 * The execution may be deferred in case the actions can not be executed
1368 static int clone_execute(struct datapath
*dp
, struct sk_buff
*skb
,
1369 struct sw_flow_key
*key
, u32 recirc_id
,
1370 const struct nlattr
*actions
, int len
,
1371 bool last
, bool clone_flow_key
)
1373 struct deferred_action
*da
;
1374 struct sw_flow_key
*clone
;
1376 skb
= last
? skb
: skb_clone(skb
, GFP_ATOMIC
);
1378 /* Out of memory, skip this action.
1383 /* When clone_flow_key is false, the 'key' will not be change
1384 * by the actions, then the 'key' can be used directly.
1385 * Otherwise, try to clone key from the next recursion level of
1386 * 'flow_keys'. If clone is successful, execute the actions
1387 * without deferring.
1389 clone
= clone_flow_key
? clone_key(key
) : key
;
1393 if (actions
) { /* Sample action */
1395 __this_cpu_inc(exec_actions_level
);
1397 err
= do_execute_actions(dp
, skb
, clone
,
1401 __this_cpu_dec(exec_actions_level
);
1402 } else { /* Recirc action */
1403 clone
->recirc_id
= recirc_id
;
1404 ovs_dp_process_packet(skb
, clone
);
1409 /* Out of 'flow_keys' space. Defer actions */
1410 da
= add_deferred_actions(skb
, key
, actions
, len
);
1412 if (!actions
) { /* Recirc action */
1414 key
->recirc_id
= recirc_id
;
1417 /* Out of per CPU action FIFO space. Drop the 'skb' and
1422 if (net_ratelimit()) {
1423 if (actions
) { /* Sample action */
1424 pr_warn("%s: deferred action limit reached, drop sample action\n",
1426 } else { /* Recirc action */
1427 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1435 static void process_deferred_actions(struct datapath
*dp
)
1437 struct action_fifo
*fifo
= this_cpu_ptr(action_fifos
);
1439 /* Do not touch the FIFO in case there is no deferred actions. */
1440 if (action_fifo_is_empty(fifo
))
1443 /* Finishing executing all deferred actions. */
1445 struct deferred_action
*da
= action_fifo_get(fifo
);
1446 struct sk_buff
*skb
= da
->skb
;
1447 struct sw_flow_key
*key
= &da
->pkt_key
;
1448 const struct nlattr
*actions
= da
->actions
;
1449 int actions_len
= da
->actions_len
;
1452 do_execute_actions(dp
, skb
, key
, actions
, actions_len
);
1454 ovs_dp_process_packet(skb
, key
);
1455 } while (!action_fifo_is_empty(fifo
));
1457 /* Reset FIFO for the next packet. */
1458 action_fifo_init(fifo
);
1461 /* Execute a list of actions against 'skb'. */
1462 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
1463 const struct sw_flow_actions
*acts
,
1464 struct sw_flow_key
*key
)
1468 level
= __this_cpu_inc_return(exec_actions_level
);
1469 if (unlikely(level
> OVS_RECURSION_LIMIT
)) {
1470 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1477 OVS_CB(skb
)->acts_origlen
= acts
->orig_len
;
1478 err
= do_execute_actions(dp
, skb
, key
,
1479 acts
->actions
, acts
->actions_len
);
1482 process_deferred_actions(dp
);
1485 __this_cpu_dec(exec_actions_level
);
1489 int action_fifos_init(void)
1491 action_fifos
= alloc_percpu(struct action_fifo
);
1495 flow_keys
= alloc_percpu(struct action_flow_keys
);
1497 free_percpu(action_fifos
);
1504 void action_fifos_exit(void)
1506 free_percpu(action_fifos
);
1507 free_percpu(flow_keys
);