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>
33 #include <net/checksum.h>
34 #include <net/dsfield.h>
36 #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 #define EXEC_ACTIONS_LEVEL_LIMIT 4 /* limit used to detect packet
65 * looping by the network stack
67 static DEFINE_PER_CPU(int, exec_actions_level
);
69 static void action_fifo_init(struct action_fifo
*fifo
)
75 static bool action_fifo_is_empty(const struct action_fifo
*fifo
)
77 return (fifo
->head
== fifo
->tail
);
80 static struct deferred_action
*action_fifo_get(struct action_fifo
*fifo
)
82 if (action_fifo_is_empty(fifo
))
85 return &fifo
->fifo
[fifo
->tail
++];
88 static struct deferred_action
*action_fifo_put(struct action_fifo
*fifo
)
90 if (fifo
->head
>= DEFERRED_ACTION_FIFO_SIZE
- 1)
93 return &fifo
->fifo
[fifo
->head
++];
96 /* Return queue entry if fifo is not full */
97 static struct deferred_action
*add_deferred_actions(struct sk_buff
*skb
,
98 const struct sw_flow_key
*key
,
99 const struct nlattr
*attr
)
101 struct action_fifo
*fifo
;
102 struct deferred_action
*da
;
104 fifo
= this_cpu_ptr(action_fifos
);
105 da
= action_fifo_put(fifo
);
115 static void invalidate_flow_key(struct sw_flow_key
*key
)
117 key
->eth
.type
= htons(0);
120 static bool is_flow_key_valid(const struct sw_flow_key
*key
)
122 return !!key
->eth
.type
;
125 static int push_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
126 const struct ovs_action_push_mpls
*mpls
)
128 __be32
*new_mpls_lse
;
131 /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
132 if (skb_encapsulation(skb
))
135 if (skb_cow_head(skb
, MPLS_HLEN
) < 0)
138 skb_push(skb
, MPLS_HLEN
);
139 memmove(skb_mac_header(skb
) - MPLS_HLEN
, skb_mac_header(skb
),
141 skb_reset_mac_header(skb
);
143 new_mpls_lse
= (__be32
*)skb_mpls_header(skb
);
144 *new_mpls_lse
= mpls
->mpls_lse
;
146 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
147 skb
->csum
= csum_add(skb
->csum
, csum_partial(new_mpls_lse
,
151 hdr
->h_proto
= mpls
->mpls_ethertype
;
152 if (!ovs_skb_get_inner_protocol(skb
))
153 ovs_skb_set_inner_protocol(skb
, skb
->protocol
);
154 skb
->protocol
= mpls
->mpls_ethertype
;
156 invalidate_flow_key(key
);
160 static int pop_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
161 const __be16 ethertype
)
166 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
170 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
171 skb
->csum
= csum_sub(skb
->csum
,
172 csum_partial(skb_mpls_header(skb
),
175 memmove(skb_mac_header(skb
) + MPLS_HLEN
, skb_mac_header(skb
),
178 __skb_pull(skb
, MPLS_HLEN
);
179 skb_reset_mac_header(skb
);
181 /* skb_mpls_header() is used to locate the ethertype
182 * field correctly in the presence of VLAN tags.
184 hdr
= (struct ethhdr
*)(skb_mpls_header(skb
) - ETH_HLEN
);
185 hdr
->h_proto
= ethertype
;
186 if (eth_p_mpls(skb
->protocol
))
187 skb
->protocol
= ethertype
;
189 invalidate_flow_key(key
);
193 static int set_mpls(struct sk_buff
*skb
, struct sw_flow_key
*key
,
194 const __be32
*mpls_lse
)
199 err
= skb_ensure_writable(skb
, skb
->mac_len
+ MPLS_HLEN
);
203 stack
= (__be32
*)skb_mpls_header(skb
);
204 if (skb
->ip_summed
== CHECKSUM_COMPLETE
) {
205 __be32 diff
[] = { ~(*stack
), *mpls_lse
};
206 skb
->csum
= ~csum_partial((char *)diff
, sizeof(diff
),
211 key
->mpls
.top_lse
= *mpls_lse
;
215 /* remove VLAN header from packet and update csum accordingly. */
216 static int __pop_vlan_tci(struct sk_buff
*skb
, __be16
*current_tci
)
218 struct vlan_hdr
*vhdr
;
221 err
= skb_ensure_writable(skb
, VLAN_ETH_HLEN
);
225 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
226 skb
->csum
= csum_sub(skb
->csum
, csum_partial(skb
->data
227 + (2 * ETH_ALEN
), VLAN_HLEN
, 0));
229 vhdr
= (struct vlan_hdr
*)(skb
->data
+ ETH_HLEN
);
230 *current_tci
= vhdr
->h_vlan_TCI
;
232 memmove(skb
->data
+ VLAN_HLEN
, skb
->data
, 2 * ETH_ALEN
);
233 __skb_pull(skb
, VLAN_HLEN
);
235 vlan_set_encap_proto(skb
, vhdr
);
236 skb
->mac_header
+= VLAN_HLEN
;
237 /* Update mac_len for subsequent MPLS actions */
238 skb
->mac_len
-= VLAN_HLEN
;
243 static int pop_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
)
248 if (likely(vlan_tx_tag_present(skb
))) {
249 vlan_set_tci(skb
, 0);
251 if (unlikely(skb
->protocol
!= htons(ETH_P_8021Q
) ||
252 skb
->len
< VLAN_ETH_HLEN
))
255 err
= __pop_vlan_tci(skb
, &tci
);
259 /* move next vlan tag to hw accel tag */
260 if (likely(skb
->protocol
!= htons(ETH_P_8021Q
) ||
261 skb
->len
< VLAN_ETH_HLEN
)) {
266 invalidate_flow_key(key
);
267 err
= __pop_vlan_tci(skb
, &tci
);
271 __vlan_hwaccel_put_tag(skb
, htons(ETH_P_8021Q
), ntohs(tci
));
275 static int push_vlan(struct sk_buff
*skb
, struct sw_flow_key
*key
,
276 const struct ovs_action_push_vlan
*vlan
)
278 if (unlikely(vlan_tx_tag_present(skb
))) {
281 /* push down current VLAN tag */
282 current_tag
= vlan_tx_tag_get(skb
);
284 if (!vlan_insert_tag_set_proto(skb
, skb
->vlan_proto
, current_tag
))
286 /* Update mac_len for subsequent MPLS actions */
287 skb
->mac_len
+= VLAN_HLEN
;
289 if (skb
->ip_summed
== CHECKSUM_COMPLETE
)
290 skb
->csum
= csum_add(skb
->csum
, csum_partial(skb
->data
291 + (2 * ETH_ALEN
), VLAN_HLEN
, 0));
293 invalidate_flow_key(key
);
295 key
->eth
.tci
= vlan
->vlan_tci
;
297 __vlan_hwaccel_put_tag(skb
, vlan
->vlan_tpid
, ntohs(vlan
->vlan_tci
) & ~VLAN_TAG_PRESENT
);
301 static int set_eth_addr(struct sk_buff
*skb
, struct sw_flow_key
*key
,
302 const struct ovs_key_ethernet
*eth_key
)
305 err
= skb_ensure_writable(skb
, ETH_HLEN
);
309 skb_postpull_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
311 ether_addr_copy(eth_hdr(skb
)->h_source
, eth_key
->eth_src
);
312 ether_addr_copy(eth_hdr(skb
)->h_dest
, eth_key
->eth_dst
);
314 ovs_skb_postpush_rcsum(skb
, eth_hdr(skb
), ETH_ALEN
* 2);
316 ether_addr_copy(key
->eth
.src
, eth_key
->eth_src
);
317 ether_addr_copy(key
->eth
.dst
, eth_key
->eth_dst
);
321 static void set_ip_addr(struct sk_buff
*skb
, struct iphdr
*nh
,
322 __be32
*addr
, __be32 new_addr
)
324 int transport_len
= skb
->len
- skb_transport_offset(skb
);
326 if (nh
->protocol
== IPPROTO_TCP
) {
327 if (likely(transport_len
>= sizeof(struct tcphdr
)))
328 inet_proto_csum_replace4(&tcp_hdr(skb
)->check
, skb
,
330 } else if (nh
->protocol
== IPPROTO_UDP
) {
331 if (likely(transport_len
>= sizeof(struct udphdr
))) {
332 struct udphdr
*uh
= udp_hdr(skb
);
334 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
335 inet_proto_csum_replace4(&uh
->check
, skb
,
338 uh
->check
= CSUM_MANGLED_0
;
343 csum_replace4(&nh
->check
, *addr
, new_addr
);
348 static void update_ipv6_checksum(struct sk_buff
*skb
, u8 l4_proto
,
349 __be32 addr
[4], const __be32 new_addr
[4])
351 int transport_len
= skb
->len
- skb_transport_offset(skb
);
353 if (l4_proto
== NEXTHDR_TCP
) {
354 if (likely(transport_len
>= sizeof(struct tcphdr
)))
355 inet_proto_csum_replace16(&tcp_hdr(skb
)->check
, skb
,
357 } else if (l4_proto
== NEXTHDR_UDP
) {
358 if (likely(transport_len
>= sizeof(struct udphdr
))) {
359 struct udphdr
*uh
= udp_hdr(skb
);
361 if (uh
->check
|| skb
->ip_summed
== CHECKSUM_PARTIAL
) {
362 inet_proto_csum_replace16(&uh
->check
, skb
,
365 uh
->check
= CSUM_MANGLED_0
;
368 } else if (l4_proto
== NEXTHDR_ICMP
) {
369 if (likely(transport_len
>= sizeof(struct icmp6hdr
)))
370 inet_proto_csum_replace16(&icmp6_hdr(skb
)->icmp6_cksum
,
371 skb
, addr
, new_addr
, 1);
375 static void set_ipv6_addr(struct sk_buff
*skb
, u8 l4_proto
,
376 __be32 addr
[4], const __be32 new_addr
[4],
377 bool recalculate_csum
)
379 if (likely(recalculate_csum
))
380 update_ipv6_checksum(skb
, l4_proto
, addr
, new_addr
);
383 memcpy(addr
, new_addr
, sizeof(__be32
[4]));
386 static void set_ipv6_tc(struct ipv6hdr
*nh
, u8 tc
)
388 nh
->priority
= tc
>> 4;
389 nh
->flow_lbl
[0] = (nh
->flow_lbl
[0] & 0x0F) | ((tc
& 0x0F) << 4);
392 static void set_ipv6_fl(struct ipv6hdr
*nh
, u32 fl
)
394 nh
->flow_lbl
[0] = (nh
->flow_lbl
[0] & 0xF0) | (fl
& 0x000F0000) >> 16;
395 nh
->flow_lbl
[1] = (fl
& 0x0000FF00) >> 8;
396 nh
->flow_lbl
[2] = fl
& 0x000000FF;
399 static void set_ip_ttl(struct sk_buff
*skb
, struct iphdr
*nh
, u8 new_ttl
)
401 csum_replace2(&nh
->check
, htons(nh
->ttl
<< 8), htons(new_ttl
<< 8));
405 static int set_ipv4(struct sk_buff
*skb
, struct sw_flow_key
*key
,
406 const struct ovs_key_ipv4
*ipv4_key
)
411 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
412 sizeof(struct iphdr
));
418 if (ipv4_key
->ipv4_src
!= nh
->saddr
) {
419 set_ip_addr(skb
, nh
, &nh
->saddr
, ipv4_key
->ipv4_src
);
420 key
->ipv4
.addr
.src
= ipv4_key
->ipv4_src
;
423 if (ipv4_key
->ipv4_dst
!= nh
->daddr
) {
424 set_ip_addr(skb
, nh
, &nh
->daddr
, ipv4_key
->ipv4_dst
);
425 key
->ipv4
.addr
.dst
= ipv4_key
->ipv4_dst
;
428 if (ipv4_key
->ipv4_tos
!= nh
->tos
) {
429 ipv4_change_dsfield(nh
, 0, ipv4_key
->ipv4_tos
);
430 key
->ip
.tos
= nh
->tos
;
433 if (ipv4_key
->ipv4_ttl
!= nh
->ttl
) {
434 set_ip_ttl(skb
, nh
, ipv4_key
->ipv4_ttl
);
435 key
->ip
.ttl
= ipv4_key
->ipv4_ttl
;
441 static int set_ipv6(struct sk_buff
*skb
, struct sw_flow_key
*key
,
442 const struct ovs_key_ipv6
*ipv6_key
)
449 err
= skb_ensure_writable(skb
, skb_network_offset(skb
) +
450 sizeof(struct ipv6hdr
));
455 saddr
= (__be32
*)&nh
->saddr
;
456 daddr
= (__be32
*)&nh
->daddr
;
458 if (memcmp(ipv6_key
->ipv6_src
, saddr
, sizeof(ipv6_key
->ipv6_src
))) {
459 set_ipv6_addr(skb
, ipv6_key
->ipv6_proto
, saddr
,
460 ipv6_key
->ipv6_src
, true);
461 memcpy(&key
->ipv6
.addr
.src
, ipv6_key
->ipv6_src
,
462 sizeof(ipv6_key
->ipv6_src
));
465 if (memcmp(ipv6_key
->ipv6_dst
, daddr
, sizeof(ipv6_key
->ipv6_dst
))) {
466 unsigned int offset
= 0;
467 int flags
= IP6_FH_F_SKIP_RH
;
468 bool recalc_csum
= true;
470 if (ipv6_ext_hdr(nh
->nexthdr
))
471 recalc_csum
= ipv6_find_hdr(skb
, &offset
,
472 NEXTHDR_ROUTING
, NULL
,
473 &flags
) != NEXTHDR_ROUTING
;
475 set_ipv6_addr(skb
, ipv6_key
->ipv6_proto
, daddr
,
476 ipv6_key
->ipv6_dst
, recalc_csum
);
477 memcpy(&key
->ipv6
.addr
.dst
, ipv6_key
->ipv6_dst
,
478 sizeof(ipv6_key
->ipv6_dst
));
481 set_ipv6_tc(nh
, ipv6_key
->ipv6_tclass
);
482 key
->ip
.tos
= ipv6_get_dsfield(nh
);
484 set_ipv6_fl(nh
, ntohl(ipv6_key
->ipv6_label
));
485 key
->ipv6
.label
= *(__be32
*)nh
& htonl(IPV6_FLOWINFO_FLOWLABEL
);
487 nh
->hop_limit
= ipv6_key
->ipv6_hlimit
;
488 key
->ip
.ttl
= ipv6_key
->ipv6_hlimit
;
492 /* Must follow skb_ensure_writable() since that can move the skb data. */
493 static void set_tp_port(struct sk_buff
*skb
, __be16
*port
,
494 __be16 new_port
, __sum16
*check
)
496 inet_proto_csum_replace2(check
, skb
, *port
, new_port
, 0);
501 static void set_udp_port(struct sk_buff
*skb
, __be16
*port
, __be16 new_port
)
503 struct udphdr
*uh
= udp_hdr(skb
);
505 if (uh
->check
&& skb
->ip_summed
!= CHECKSUM_PARTIAL
) {
506 set_tp_port(skb
, port
, new_port
, &uh
->check
);
509 uh
->check
= CSUM_MANGLED_0
;
516 static int set_udp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
517 const struct ovs_key_udp
*udp_port_key
)
522 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
523 sizeof(struct udphdr
));
528 if (udp_port_key
->udp_src
!= uh
->source
) {
529 set_udp_port(skb
, &uh
->source
, udp_port_key
->udp_src
);
530 key
->tp
.src
= udp_port_key
->udp_src
;
533 if (udp_port_key
->udp_dst
!= uh
->dest
) {
534 set_udp_port(skb
, &uh
->dest
, udp_port_key
->udp_dst
);
535 key
->tp
.dst
= udp_port_key
->udp_dst
;
541 static int set_tcp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
542 const struct ovs_key_tcp
*tcp_port_key
)
547 err
= skb_ensure_writable(skb
, skb_transport_offset(skb
) +
548 sizeof(struct tcphdr
));
553 if (tcp_port_key
->tcp_src
!= th
->source
) {
554 set_tp_port(skb
, &th
->source
, tcp_port_key
->tcp_src
, &th
->check
);
555 key
->tp
.src
= tcp_port_key
->tcp_src
;
558 if (tcp_port_key
->tcp_dst
!= th
->dest
) {
559 set_tp_port(skb
, &th
->dest
, tcp_port_key
->tcp_dst
, &th
->check
);
560 key
->tp
.dst
= tcp_port_key
->tcp_dst
;
566 static int set_sctp(struct sk_buff
*skb
, struct sw_flow_key
*key
,
567 const struct ovs_key_sctp
*sctp_port_key
)
571 unsigned int sctphoff
= skb_transport_offset(skb
);
573 err
= skb_ensure_writable(skb
, sctphoff
+ sizeof(struct sctphdr
));
578 if (sctp_port_key
->sctp_src
!= sh
->source
||
579 sctp_port_key
->sctp_dst
!= sh
->dest
) {
580 __le32 old_correct_csum
, new_csum
, old_csum
;
582 old_csum
= sh
->checksum
;
583 old_correct_csum
= sctp_compute_cksum(skb
, sctphoff
);
585 sh
->source
= sctp_port_key
->sctp_src
;
586 sh
->dest
= sctp_port_key
->sctp_dst
;
588 new_csum
= sctp_compute_cksum(skb
, sctphoff
);
590 /* Carry any checksum errors through. */
591 sh
->checksum
= old_csum
^ old_correct_csum
^ new_csum
;
594 key
->tp
.src
= sctp_port_key
->sctp_src
;
595 key
->tp
.dst
= sctp_port_key
->sctp_dst
;
601 static void do_output(struct datapath
*dp
, struct sk_buff
*skb
, int out_port
)
603 struct vport
*vport
= ovs_vport_rcu(dp
, out_port
);
606 ovs_vport_send(vport
, skb
);
611 static int output_userspace(struct datapath
*dp
, struct sk_buff
*skb
,
612 struct sw_flow_key
*key
, const struct nlattr
*attr
)
614 struct ovs_tunnel_info info
;
615 struct dp_upcall_info upcall
;
616 const struct nlattr
*a
;
619 upcall
.cmd
= OVS_PACKET_CMD_ACTION
;
620 upcall
.userdata
= NULL
;
622 upcall
.egress_tun_info
= NULL
;
624 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
625 a
= nla_next(a
, &rem
)) {
626 switch (nla_type(a
)) {
627 case OVS_USERSPACE_ATTR_USERDATA
:
631 case OVS_USERSPACE_ATTR_PID
:
632 upcall
.portid
= nla_get_u32(a
);
635 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT
: {
636 /* Get out tunnel info. */
639 vport
= ovs_vport_rcu(dp
, nla_get_u32(a
));
643 err
= ovs_vport_get_egress_tun_info(vport
, skb
,
646 upcall
.egress_tun_info
= &info
;
651 } /* End of switch. */
654 return ovs_dp_upcall(dp
, skb
, key
, &upcall
);
657 static int sample(struct datapath
*dp
, struct sk_buff
*skb
,
658 struct sw_flow_key
*key
, const struct nlattr
*attr
)
660 const struct nlattr
*acts_list
= NULL
;
661 const struct nlattr
*a
;
664 for (a
= nla_data(attr
), rem
= nla_len(attr
); rem
> 0;
665 a
= nla_next(a
, &rem
)) {
666 switch (nla_type(a
)) {
667 case OVS_SAMPLE_ATTR_PROBABILITY
:
668 if (prandom_u32() >= nla_get_u32(a
))
672 case OVS_SAMPLE_ATTR_ACTIONS
:
678 rem
= nla_len(acts_list
);
679 a
= nla_data(acts_list
);
681 /* Actions list is empty, do nothing */
685 /* The only known usage of sample action is having a single user-space
686 * action. Treat this usage as a special case.
687 * The output_userspace() should clone the skb to be sent to the
688 * user space. This skb will be consumed by its caller.
690 if (likely(nla_type(a
) == OVS_ACTION_ATTR_USERSPACE
&&
691 nla_is_last(a
, rem
)))
692 return output_userspace(dp
, skb
, key
, a
);
694 skb
= skb_clone(skb
, GFP_ATOMIC
);
696 /* Skip the sample action when out of memory. */
699 if (!add_deferred_actions(skb
, key
, a
)) {
701 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
709 static void execute_hash(struct sk_buff
*skb
, struct sw_flow_key
*key
,
710 const struct nlattr
*attr
)
712 struct ovs_action_hash
*hash_act
= nla_data(attr
);
715 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
716 hash
= skb_get_hash(skb
);
717 hash
= jhash_1word(hash
, hash_act
->hash_basis
);
721 key
->ovs_flow_hash
= hash
;
724 static int execute_set_action(struct sk_buff
*skb
, struct sw_flow_key
*key
,
725 const struct nlattr
*nested_attr
)
729 switch (nla_type(nested_attr
)) {
730 case OVS_KEY_ATTR_PRIORITY
:
731 skb
->priority
= nla_get_u32(nested_attr
);
732 key
->phy
.priority
= skb
->priority
;
735 case OVS_KEY_ATTR_SKB_MARK
:
736 skb
->mark
= nla_get_u32(nested_attr
);
737 key
->phy
.skb_mark
= skb
->mark
;
740 case OVS_KEY_ATTR_TUNNEL_INFO
:
741 OVS_CB(skb
)->egress_tun_info
= nla_data(nested_attr
);
744 case OVS_KEY_ATTR_ETHERNET
:
745 err
= set_eth_addr(skb
, key
, nla_data(nested_attr
));
748 case OVS_KEY_ATTR_IPV4
:
749 err
= set_ipv4(skb
, key
, nla_data(nested_attr
));
752 case OVS_KEY_ATTR_IPV6
:
753 err
= set_ipv6(skb
, key
, nla_data(nested_attr
));
756 case OVS_KEY_ATTR_TCP
:
757 err
= set_tcp(skb
, key
, nla_data(nested_attr
));
760 case OVS_KEY_ATTR_UDP
:
761 err
= set_udp(skb
, key
, nla_data(nested_attr
));
764 case OVS_KEY_ATTR_SCTP
:
765 err
= set_sctp(skb
, key
, nla_data(nested_attr
));
768 case OVS_KEY_ATTR_MPLS
:
769 err
= set_mpls(skb
, key
, nla_data(nested_attr
));
776 static int execute_recirc(struct datapath
*dp
, struct sk_buff
*skb
,
777 struct sw_flow_key
*key
,
778 const struct nlattr
*a
, int rem
)
780 struct deferred_action
*da
;
782 if (!is_flow_key_valid(key
)) {
785 err
= ovs_flow_key_update(skb
, key
);
789 BUG_ON(!is_flow_key_valid(key
));
791 if (!nla_is_last(a
, rem
)) {
792 /* Recirc action is the not the last action
793 * of the action list, need to clone the skb.
795 skb
= skb_clone(skb
, GFP_ATOMIC
);
797 /* Skip the recirc action when out of memory, but
798 * continue on with the rest of the action list.
804 da
= add_deferred_actions(skb
, key
, NULL
);
806 da
->pkt_key
.recirc_id
= nla_get_u32(a
);
811 pr_warn("%s: deferred action limit reached, drop recirc action\n",
818 /* Execute a list of actions against 'skb'. */
819 static int do_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
820 struct sw_flow_key
*key
,
821 const struct nlattr
*attr
, int len
)
823 /* Every output action needs a separate clone of 'skb', but the common
824 * case is just a single output action, so that doing a clone and
825 * then freeing the original skbuff is wasteful. So the following code
826 * is slightly obscure just to avoid that.
829 const struct nlattr
*a
;
832 for (a
= attr
, rem
= len
; rem
> 0;
833 a
= nla_next(a
, &rem
)) {
836 if (unlikely(prev_port
!= -1)) {
837 struct sk_buff
*out_skb
= skb_clone(skb
, GFP_ATOMIC
);
840 do_output(dp
, out_skb
, prev_port
);
845 switch (nla_type(a
)) {
846 case OVS_ACTION_ATTR_OUTPUT
:
847 prev_port
= nla_get_u32(a
);
850 case OVS_ACTION_ATTR_USERSPACE
:
851 output_userspace(dp
, skb
, key
, a
);
854 case OVS_ACTION_ATTR_HASH
:
855 execute_hash(skb
, key
, a
);
858 case OVS_ACTION_ATTR_PUSH_MPLS
:
859 err
= push_mpls(skb
, key
, nla_data(a
));
862 case OVS_ACTION_ATTR_POP_MPLS
:
863 err
= pop_mpls(skb
, key
, nla_get_be16(a
));
866 case OVS_ACTION_ATTR_PUSH_VLAN
:
867 err
= push_vlan(skb
, key
, nla_data(a
));
868 if (unlikely(err
)) /* skb already freed. */
872 case OVS_ACTION_ATTR_POP_VLAN
:
873 err
= pop_vlan(skb
, key
);
876 case OVS_ACTION_ATTR_RECIRC
:
877 err
= execute_recirc(dp
, skb
, key
, a
, rem
);
878 if (nla_is_last(a
, rem
)) {
879 /* If this is the last action, the skb has
880 * been consumed or freed.
881 * Return immediately.
887 case OVS_ACTION_ATTR_SET
:
888 err
= execute_set_action(skb
, key
, nla_data(a
));
891 case OVS_ACTION_ATTR_SAMPLE
:
892 err
= sample(dp
, skb
, key
, a
);
903 do_output(dp
, skb
, prev_port
);
910 static void process_deferred_actions(struct datapath
*dp
)
912 struct action_fifo
*fifo
= this_cpu_ptr(action_fifos
);
914 /* Do not touch the FIFO in case there is no deferred actions. */
915 if (action_fifo_is_empty(fifo
))
918 /* Finishing executing all deferred actions. */
920 struct deferred_action
*da
= action_fifo_get(fifo
);
921 struct sk_buff
*skb
= da
->skb
;
922 struct sw_flow_key
*key
= &da
->pkt_key
;
923 const struct nlattr
*actions
= da
->actions
;
926 do_execute_actions(dp
, skb
, key
, actions
,
929 ovs_dp_process_packet(skb
, key
);
930 } while (!action_fifo_is_empty(fifo
));
932 /* Reset FIFO for the next packet. */
933 action_fifo_init(fifo
);
936 /* Execute a list of actions against 'skb'. */
937 int ovs_execute_actions(struct datapath
*dp
, struct sk_buff
*skb
,
938 const struct sw_flow_actions
*acts
,
939 struct sw_flow_key
*key
)
941 int level
= this_cpu_read(exec_actions_level
);
944 if (unlikely(level
>= EXEC_ACTIONS_LEVEL_LIMIT
)) {
946 pr_warn("%s: packet loop detected, dropping.\n",
953 this_cpu_inc(exec_actions_level
);
954 err
= do_execute_actions(dp
, skb
, key
,
955 acts
->actions
, acts
->actions_len
);
958 process_deferred_actions(dp
);
960 this_cpu_dec(exec_actions_level
);
962 /* This return status currently does not reflect the errors
963 * encounted during deferred actions execution. Probably needs to
964 * be fixed in the future.
969 int action_fifos_init(void)
971 action_fifos
= alloc_percpu(struct action_fifo
);
978 void action_fifos_exit(void)
980 free_percpu(action_fifos
);