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 /* 'KEY' must not have any bits set outside of the 'MASK' */
194 #define MASKED(OLD, KEY, MASK) ((KEY) | ((OLD) & ~(MASK)))
195 #define SET_MASKED(OLD, KEY, MASK) ((OLD) = MASKED(OLD, KEY, MASK))
197 static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
198 const __be32 *mpls_lse, const __be32 *mask)
204 err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
208 stack = (__be32 *)skb_mpls_header(skb);
209 lse = MASKED(*stack, *mpls_lse, *mask);
210 if (skb->ip_summed == CHECKSUM_COMPLETE) {
211 __be32 diff[] = { ~(*stack), lse };
213 skb->csum = ~csum_partial((char *)diff, sizeof(diff),
218 flow_key->mpls.top_lse = lse;
222 static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
226 err = skb_vlan_pop(skb);
227 if (skb_vlan_tag_present(skb))
228 invalidate_flow_key(key);
235 static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
236 const struct ovs_action_push_vlan *vlan)
238 if (skb_vlan_tag_present(skb))
239 invalidate_flow_key(key);
241 key->eth.tci = vlan->vlan_tci;
243 return skb_vlan_push(skb, vlan->vlan_tpid,
244 ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
247 /* 'src' is already properly masked. */
248 static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
250 u16 *dst = (u16 *)dst_;
251 const u16 *src = (const u16 *)src_;
252 const u16 *mask = (const u16 *)mask_;
254 SET_MASKED(dst[0], src[0], mask[0]);
255 SET_MASKED(dst[1], src[1], mask[1]);
256 SET_MASKED(dst[2], src[2], mask[2]);
259 static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
260 const struct ovs_key_ethernet *key,
261 const struct ovs_key_ethernet *mask)
265 err = skb_ensure_writable(skb, ETH_HLEN);
269 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
271 ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
273 ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
276 ovs_skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
278 ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
279 ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
283 static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
284 __be32 *addr, __be32 new_addr)
286 int transport_len = skb->len - skb_transport_offset(skb);
288 if (nh->protocol == IPPROTO_TCP) {
289 if (likely(transport_len >= sizeof(struct tcphdr)))
290 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
292 } else if (nh->protocol == IPPROTO_UDP) {
293 if (likely(transport_len >= sizeof(struct udphdr))) {
294 struct udphdr *uh = udp_hdr(skb);
296 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
297 inet_proto_csum_replace4(&uh->check, skb,
300 uh->check = CSUM_MANGLED_0;
305 csum_replace4(&nh->check, *addr, new_addr);
310 static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
311 __be32 addr[4], const __be32 new_addr[4])
313 int transport_len = skb->len - skb_transport_offset(skb);
315 if (l4_proto == NEXTHDR_TCP) {
316 if (likely(transport_len >= sizeof(struct tcphdr)))
317 inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
319 } else if (l4_proto == NEXTHDR_UDP) {
320 if (likely(transport_len >= sizeof(struct udphdr))) {
321 struct udphdr *uh = udp_hdr(skb);
323 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
324 inet_proto_csum_replace16(&uh->check, skb,
327 uh->check = CSUM_MANGLED_0;
330 } else if (l4_proto == NEXTHDR_ICMP) {
331 if (likely(transport_len >= sizeof(struct icmp6hdr)))
332 inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
333 skb, addr, new_addr, 1);
337 static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
338 const __be32 mask[4], __be32 masked[4])
340 masked[0] = MASKED(old[0], addr[0], mask[0]);
341 masked[1] = MASKED(old[1], addr[1], mask[1]);
342 masked[2] = MASKED(old[2], addr[2], mask[2]);
343 masked[3] = MASKED(old[3], addr[3], mask[3]);
346 static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
347 __be32 addr[4], const __be32 new_addr[4],
348 bool recalculate_csum)
350 if (likely(recalculate_csum))
351 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
354 memcpy(addr, new_addr, sizeof(__be32[4]));
357 static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
359 /* Bits 21-24 are always unmasked, so this retains their values. */
360 SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
361 SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
362 SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
365 static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
368 new_ttl = MASKED(nh->ttl, new_ttl, mask);
370 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
374 static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
375 const struct ovs_key_ipv4 *key,
376 const struct ovs_key_ipv4 *mask)
382 err = skb_ensure_writable(skb, skb_network_offset(skb) +
383 sizeof(struct iphdr));
389 /* Setting an IP addresses is typically only a side effect of
390 * matching on them in the current userspace implementation, so it
391 * makes sense to check if the value actually changed.
393 if (mask->ipv4_src) {
394 new_addr = MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
396 if (unlikely(new_addr != nh->saddr)) {
397 set_ip_addr(skb, nh, &nh->saddr, new_addr);
398 flow_key->ipv4.addr.src = new_addr;
401 if (mask->ipv4_dst) {
402 new_addr = MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
404 if (unlikely(new_addr != nh->daddr)) {
405 set_ip_addr(skb, nh, &nh->daddr, new_addr);
406 flow_key->ipv4.addr.dst = new_addr;
409 if (mask->ipv4_tos) {
410 ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
411 flow_key->ip.tos = nh->tos;
413 if (mask->ipv4_ttl) {
414 set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
415 flow_key->ip.ttl = nh->ttl;
421 static bool is_ipv6_mask_nonzero(const __be32 addr[4])
423 return !!(addr[0] | addr[1] | addr[2] | addr[3]);
426 static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
427 const struct ovs_key_ipv6 *key,
428 const struct ovs_key_ipv6 *mask)
433 err = skb_ensure_writable(skb, skb_network_offset(skb) +
434 sizeof(struct ipv6hdr));
440 /* Setting an IP addresses is typically only a side effect of
441 * matching on them in the current userspace implementation, so it
442 * makes sense to check if the value actually changed.
444 if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
445 __be32 *saddr = (__be32 *)&nh->saddr;
448 mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
450 if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
451 set_ipv6_addr(skb, key->ipv6_proto, saddr, masked,
453 memcpy(&flow_key->ipv6.addr.src, masked,
454 sizeof(flow_key->ipv6.addr.src));
457 if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
458 unsigned int offset = 0;
459 int flags = IP6_FH_F_SKIP_RH;
460 bool recalc_csum = true;
461 __be32 *daddr = (__be32 *)&nh->daddr;
464 mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
466 if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
467 if (ipv6_ext_hdr(nh->nexthdr))
468 recalc_csum = (ipv6_find_hdr(skb, &offset,
473 set_ipv6_addr(skb, key->ipv6_proto, daddr, masked,
475 memcpy(&flow_key->ipv6.addr.dst, masked,
476 sizeof(flow_key->ipv6.addr.dst));
479 if (mask->ipv6_tclass) {
480 ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
481 flow_key->ip.tos = ipv6_get_dsfield(nh);
483 if (mask->ipv6_label) {
484 set_ipv6_fl(nh, ntohl(key->ipv6_label),
485 ntohl(mask->ipv6_label));
486 flow_key->ipv6.label =
487 *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
489 if (mask->ipv6_hlimit) {
490 SET_MASKED(nh->hop_limit, key->ipv6_hlimit, mask->ipv6_hlimit);
491 flow_key->ip.ttl = nh->hop_limit;
496 /* Must follow skb_ensure_writable() since that can move the skb data. */
497 static void set_tp_port(struct sk_buff *skb, __be16 *port,
498 __be16 new_port, __sum16 *check)
500 inet_proto_csum_replace2(check, skb, *port, new_port, 0);
504 static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
505 const struct ovs_key_udp *key,
506 const struct ovs_key_udp *mask)
512 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
513 sizeof(struct udphdr));
518 /* Either of the masks is non-zero, so do not bother checking them. */
519 src = MASKED(uh->source, key->udp_src, mask->udp_src);
520 dst = MASKED(uh->dest, key->udp_dst, mask->udp_dst);
522 if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
523 if (likely(src != uh->source)) {
524 set_tp_port(skb, &uh->source, src, &uh->check);
525 flow_key->tp.src = src;
527 if (likely(dst != uh->dest)) {
528 set_tp_port(skb, &uh->dest, dst, &uh->check);
529 flow_key->tp.dst = dst;
532 if (unlikely(!uh->check))
533 uh->check = CSUM_MANGLED_0;
537 flow_key->tp.src = src;
538 flow_key->tp.dst = dst;
546 static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
547 const struct ovs_key_tcp *key,
548 const struct ovs_key_tcp *mask)
554 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
555 sizeof(struct tcphdr));
561 src = MASKED(th->source, key->tcp_src, mask->tcp_src);
562 if (likely(src != th->source)) {
563 set_tp_port(skb, &th->source, src, &th->check);
564 flow_key->tp.src = src;
566 dst = MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
567 if (likely(dst != th->dest)) {
568 set_tp_port(skb, &th->dest, dst, &th->check);
569 flow_key->tp.dst = dst;
576 static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
577 const struct ovs_key_sctp *key,
578 const struct ovs_key_sctp *mask)
580 unsigned int sctphoff = skb_transport_offset(skb);
582 __le32 old_correct_csum, new_csum, old_csum;
585 err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
591 old_csum = sh->checksum;
592 old_correct_csum = sctp_compute_cksum(skb, sctphoff);
594 sh->source = MASKED(sh->source, key->sctp_src, mask->sctp_src);
595 sh->dest = MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
597 new_csum = sctp_compute_cksum(skb, sctphoff);
599 /* Carry any checksum errors through. */
600 sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
603 flow_key->tp.src = sh->source;
604 flow_key->tp.dst = sh->dest;
609 static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port)
611 struct vport *vport = ovs_vport_rcu(dp, out_port);
614 ovs_vport_send(vport, skb);
619 static int output_userspace(struct datapath *dp, struct sk_buff *skb,
620 struct sw_flow_key *key, const struct nlattr *attr)
622 struct ovs_tunnel_info info;
623 struct dp_upcall_info upcall;
624 const struct nlattr *a;
627 upcall.cmd = OVS_PACKET_CMD_ACTION;
628 upcall.userdata = NULL;
630 upcall.egress_tun_info = NULL;
632 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
633 a = nla_next(a, &rem)) {
634 switch (nla_type(a)) {
635 case OVS_USERSPACE_ATTR_USERDATA:
639 case OVS_USERSPACE_ATTR_PID:
640 upcall.portid = nla_get_u32(a);
643 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
644 /* Get out tunnel info. */
647 vport = ovs_vport_rcu(dp, nla_get_u32(a));
651 err = ovs_vport_get_egress_tun_info(vport, skb,
654 upcall.egress_tun_info = &info;
659 } /* End of switch. */
662 return ovs_dp_upcall(dp, skb, key, &upcall);
665 static int sample(struct datapath *dp, struct sk_buff *skb,
666 struct sw_flow_key *key, const struct nlattr *attr)
668 const struct nlattr *acts_list = NULL;
669 const struct nlattr *a;
672 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
673 a = nla_next(a, &rem)) {
674 switch (nla_type(a)) {
675 case OVS_SAMPLE_ATTR_PROBABILITY:
676 if (prandom_u32() >= nla_get_u32(a))
680 case OVS_SAMPLE_ATTR_ACTIONS:
686 rem = nla_len(acts_list);
687 a = nla_data(acts_list);
689 /* Actions list is empty, do nothing */
693 /* The only known usage of sample action is having a single user-space
694 * action. Treat this usage as a special case.
695 * The output_userspace() should clone the skb to be sent to the
696 * user space. This skb will be consumed by its caller.
698 if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
699 nla_is_last(a, rem)))
700 return output_userspace(dp, skb, key, a);
702 skb = skb_clone(skb, GFP_ATOMIC);
704 /* Skip the sample action when out of memory. */
707 if (!add_deferred_actions(skb, key, a)) {
709 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
717 static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
718 const struct nlattr *attr)
720 struct ovs_action_hash *hash_act = nla_data(attr);
723 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
724 hash = skb_get_hash(skb);
725 hash = jhash_1word(hash, hash_act->hash_basis);
729 key->ovs_flow_hash = hash;
732 static int execute_set_action(struct sk_buff *skb,
733 struct sw_flow_key *flow_key,
734 const struct nlattr *a)
736 /* Only tunnel set execution is supported without a mask. */
737 if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
738 OVS_CB(skb)->egress_tun_info = nla_data(a);
746 /* Mask is at the midpoint of the data. */
747 #define get_mask(a, type) ((const type)nla_data(a) + 1)
749 static int execute_masked_set_action(struct sk_buff *skb,
750 struct sw_flow_key *flow_key,
751 const struct nlattr *a)
755 switch (nla_type(a)) {
756 case OVS_KEY_ATTR_PRIORITY:
757 SET_MASKED(skb->priority, nla_get_u32(a), *get_mask(a, u32 *));
758 flow_key->phy.priority = skb->priority;
761 case OVS_KEY_ATTR_SKB_MARK:
762 SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
763 flow_key->phy.skb_mark = skb->mark;
766 case OVS_KEY_ATTR_TUNNEL_INFO:
767 /* Masked data not supported for tunnel. */
771 case OVS_KEY_ATTR_ETHERNET:
772 err = set_eth_addr(skb, flow_key, nla_data(a),
773 get_mask(a, struct ovs_key_ethernet *));
776 case OVS_KEY_ATTR_IPV4:
777 err = set_ipv4(skb, flow_key, nla_data(a),
778 get_mask(a, struct ovs_key_ipv4 *));
781 case OVS_KEY_ATTR_IPV6:
782 err = set_ipv6(skb, flow_key, nla_data(a),
783 get_mask(a, struct ovs_key_ipv6 *));
786 case OVS_KEY_ATTR_TCP:
787 err = set_tcp(skb, flow_key, nla_data(a),
788 get_mask(a, struct ovs_key_tcp *));
791 case OVS_KEY_ATTR_UDP:
792 err = set_udp(skb, flow_key, nla_data(a),
793 get_mask(a, struct ovs_key_udp *));
796 case OVS_KEY_ATTR_SCTP:
797 err = set_sctp(skb, flow_key, nla_data(a),
798 get_mask(a, struct ovs_key_sctp *));
801 case OVS_KEY_ATTR_MPLS:
802 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
810 static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
811 struct sw_flow_key *key,
812 const struct nlattr *a, int rem)
814 struct deferred_action *da;
816 if (!is_flow_key_valid(key)) {
819 err = ovs_flow_key_update(skb, key);
823 BUG_ON(!is_flow_key_valid(key));
825 if (!nla_is_last(a, rem)) {
826 /* Recirc action is the not the last action
827 * of the action list, need to clone the skb.
829 skb = skb_clone(skb, GFP_ATOMIC);
831 /* Skip the recirc action when out of memory, but
832 * continue on with the rest of the action list.
838 da = add_deferred_actions(skb, key, NULL);
840 da->pkt_key.recirc_id = nla_get_u32(a);
845 pr_warn("%s: deferred action limit reached, drop recirc action\n",
852 /* Execute a list of actions against 'skb'. */
853 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
854 struct sw_flow_key *key,
855 const struct nlattr *attr, int len)
857 /* Every output action needs a separate clone of 'skb', but the common
858 * case is just a single output action, so that doing a clone and
859 * then freeing the original skbuff is wasteful. So the following code
860 * is slightly obscure just to avoid that.
863 const struct nlattr *a;
866 for (a = attr, rem = len; rem > 0;
867 a = nla_next(a, &rem)) {
870 if (unlikely(prev_port != -1)) {
871 struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC);
874 do_output(dp, out_skb, prev_port);
879 switch (nla_type(a)) {
880 case OVS_ACTION_ATTR_OUTPUT:
881 prev_port = nla_get_u32(a);
884 case OVS_ACTION_ATTR_USERSPACE:
885 output_userspace(dp, skb, key, a);
888 case OVS_ACTION_ATTR_HASH:
889 execute_hash(skb, key, a);
892 case OVS_ACTION_ATTR_PUSH_MPLS:
893 err = push_mpls(skb, key, nla_data(a));
896 case OVS_ACTION_ATTR_POP_MPLS:
897 err = pop_mpls(skb, key, nla_get_be16(a));
900 case OVS_ACTION_ATTR_PUSH_VLAN:
901 err = push_vlan(skb, key, nla_data(a));
904 case OVS_ACTION_ATTR_POP_VLAN:
905 err = pop_vlan(skb, key);
908 case OVS_ACTION_ATTR_RECIRC:
909 err = execute_recirc(dp, skb, key, a, rem);
910 if (nla_is_last(a, rem)) {
911 /* If this is the last action, the skb has
912 * been consumed or freed.
913 * Return immediately.
919 case OVS_ACTION_ATTR_SET:
920 err = execute_set_action(skb, key, nla_data(a));
923 case OVS_ACTION_ATTR_SET_MASKED:
924 case OVS_ACTION_ATTR_SET_TO_MASKED:
925 err = execute_masked_set_action(skb, key, nla_data(a));
928 case OVS_ACTION_ATTR_SAMPLE:
929 err = sample(dp, skb, key, a);
940 do_output(dp, skb, prev_port);
947 static void process_deferred_actions(struct datapath *dp)
949 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
951 /* Do not touch the FIFO in case there is no deferred actions. */
952 if (action_fifo_is_empty(fifo))
955 /* Finishing executing all deferred actions. */
957 struct deferred_action *da = action_fifo_get(fifo);
958 struct sk_buff *skb = da->skb;
959 struct sw_flow_key *key = &da->pkt_key;
960 const struct nlattr *actions = da->actions;
963 do_execute_actions(dp, skb, key, actions,
966 ovs_dp_process_packet(skb, key);
967 } while (!action_fifo_is_empty(fifo));
969 /* Reset FIFO for the next packet. */
970 action_fifo_init(fifo);
973 /* Execute a list of actions against 'skb'. */
974 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
975 const struct sw_flow_actions *acts,
976 struct sw_flow_key *key)
978 int level = this_cpu_read(exec_actions_level);
981 if (unlikely(level >= EXEC_ACTIONS_LEVEL_LIMIT)) {
983 pr_warn("%s: packet loop detected, dropping.\n",
990 this_cpu_inc(exec_actions_level);
991 err = do_execute_actions(dp, skb, key,
992 acts->actions, acts->actions_len);
995 process_deferred_actions(dp);
997 this_cpu_dec(exec_actions_level);
999 /* This return status currently does not reflect the errors
1000 * encounted during deferred actions execution. Probably needs to
1001 * be fixed in the future.
1006 int action_fifos_init(void)
1008 action_fifos = alloc_percpu(struct action_fifo);
1015 void action_fifos_exit(void)
1017 free_percpu(action_fifos);