2 * Copyright (c) 2007-2014 Nicira, Inc.
4 * This program is free software; you can redistribute it and/or
5 * modify it under the terms of version 2 of the GNU General Public
6 * License as published by the Free Software Foundation.
8 * This program is distributed in the hope that it will be useful, but
9 * WITHOUT ANY WARRANTY; without even the implied warranty of
10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
11 * General Public License for more details.
13 * You should have received a copy of the GNU General Public License
14 * along with this program; if not, write to the Free Software
15 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
19 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
21 #include <linux/skbuff.h>
24 #include <linux/openvswitch.h>
25 #include <linux/netfilter_ipv6.h>
26 #include <linux/sctp.h>
27 #include <linux/tcp.h>
28 #include <linux/udp.h>
29 #include <linux/in6.h>
30 #include <linux/if_arp.h>
31 #include <linux/if_vlan.h>
36 #include <net/ip6_fib.h>
37 #include <net/checksum.h>
38 #include <net/dsfield.h>
40 #include <net/sctp/checksum.h>
44 #include "conntrack.h"
47 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
48 struct sw_flow_key *key,
49 const struct nlattr *attr, int len);
51 struct deferred_action {
53 const struct nlattr *actions;
55 /* Store pkt_key clone when creating deferred action. */
56 struct sw_flow_key pkt_key;
59 #define MAX_L2_LEN (VLAN_ETH_HLEN + 3 * MPLS_HLEN)
60 struct ovs_frag_data {
64 __be16 inner_protocol;
68 u8 l2_data[MAX_L2_LEN];
71 static DEFINE_PER_CPU(struct ovs_frag_data, ovs_frag_data_storage);
73 #define DEFERRED_ACTION_FIFO_SIZE 10
77 /* Deferred action fifo queue storage. */
78 struct deferred_action fifo[DEFERRED_ACTION_FIFO_SIZE];
81 static struct action_fifo __percpu *action_fifos;
82 static DEFINE_PER_CPU(int, exec_actions_level);
84 static void action_fifo_init(struct action_fifo *fifo)
90 static bool action_fifo_is_empty(const struct action_fifo *fifo)
92 return (fifo->head == fifo->tail);
95 static struct deferred_action *action_fifo_get(struct action_fifo *fifo)
97 if (action_fifo_is_empty(fifo))
100 return &fifo->fifo[fifo->tail++];
103 static struct deferred_action *action_fifo_put(struct action_fifo *fifo)
105 if (fifo->head >= DEFERRED_ACTION_FIFO_SIZE - 1)
108 return &fifo->fifo[fifo->head++];
111 /* Return true if fifo is not full */
112 static struct deferred_action *add_deferred_actions(struct sk_buff *skb,
113 const struct sw_flow_key *key,
114 const struct nlattr *attr)
116 struct action_fifo *fifo;
117 struct deferred_action *da;
119 fifo = this_cpu_ptr(action_fifos);
120 da = action_fifo_put(fifo);
130 static void invalidate_flow_key(struct sw_flow_key *key)
132 key->eth.type = htons(0);
135 static bool is_flow_key_valid(const struct sw_flow_key *key)
137 return !!key->eth.type;
140 static void update_ethertype(struct sk_buff *skb, struct ethhdr *hdr,
143 if (skb->ip_summed == CHECKSUM_COMPLETE) {
144 __be16 diff[] = { ~(hdr->h_proto), ethertype };
146 skb->csum = ~csum_partial((char *)diff, sizeof(diff),
150 hdr->h_proto = ethertype;
153 static int push_mpls(struct sk_buff *skb, struct sw_flow_key *key,
154 const struct ovs_action_push_mpls *mpls)
156 __be32 *new_mpls_lse;
158 /* Networking stack do not allow simultaneous Tunnel and MPLS GSO. */
159 if (skb->encapsulation)
162 if (skb_cow_head(skb, MPLS_HLEN) < 0)
165 if (!skb->inner_protocol) {
166 skb_set_inner_network_header(skb, skb->mac_len);
167 skb_set_inner_protocol(skb, skb->protocol);
170 skb_push(skb, MPLS_HLEN);
171 memmove(skb_mac_header(skb) - MPLS_HLEN, skb_mac_header(skb),
173 skb_reset_mac_header(skb);
174 skb_set_network_header(skb, skb->mac_len);
176 new_mpls_lse = (__be32 *)skb_mpls_header(skb);
177 *new_mpls_lse = mpls->mpls_lse;
179 skb_postpush_rcsum(skb, new_mpls_lse, MPLS_HLEN);
181 update_ethertype(skb, eth_hdr(skb), mpls->mpls_ethertype);
182 skb->protocol = mpls->mpls_ethertype;
184 invalidate_flow_key(key);
188 static int pop_mpls(struct sk_buff *skb, struct sw_flow_key *key,
189 const __be16 ethertype)
194 err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
198 skb_postpull_rcsum(skb, skb_mpls_header(skb), MPLS_HLEN);
200 memmove(skb_mac_header(skb) + MPLS_HLEN, skb_mac_header(skb),
203 __skb_pull(skb, MPLS_HLEN);
204 skb_reset_mac_header(skb);
205 skb_set_network_header(skb, skb->mac_len);
207 /* skb_mpls_header() is used to locate the ethertype
208 * field correctly in the presence of VLAN tags.
210 hdr = (struct ethhdr *)(skb_mpls_header(skb) - ETH_HLEN);
211 update_ethertype(skb, hdr, ethertype);
212 if (eth_p_mpls(skb->protocol))
213 skb->protocol = ethertype;
215 invalidate_flow_key(key);
219 static int set_mpls(struct sk_buff *skb, struct sw_flow_key *flow_key,
220 const __be32 *mpls_lse, const __be32 *mask)
226 err = skb_ensure_writable(skb, skb->mac_len + MPLS_HLEN);
230 stack = (__be32 *)skb_mpls_header(skb);
231 lse = OVS_MASKED(*stack, *mpls_lse, *mask);
232 if (skb->ip_summed == CHECKSUM_COMPLETE) {
233 __be32 diff[] = { ~(*stack), lse };
235 skb->csum = ~csum_partial((char *)diff, sizeof(diff),
240 flow_key->mpls.top_lse = lse;
244 static int pop_vlan(struct sk_buff *skb, struct sw_flow_key *key)
248 err = skb_vlan_pop(skb);
249 if (skb_vlan_tag_present(skb)) {
250 invalidate_flow_key(key);
252 key->eth.vlan.tci = 0;
253 key->eth.vlan.tpid = 0;
258 static int push_vlan(struct sk_buff *skb, struct sw_flow_key *key,
259 const struct ovs_action_push_vlan *vlan)
261 if (skb_vlan_tag_present(skb)) {
262 invalidate_flow_key(key);
264 key->eth.vlan.tci = vlan->vlan_tci;
265 key->eth.vlan.tpid = vlan->vlan_tpid;
267 return skb_vlan_push(skb, vlan->vlan_tpid,
268 ntohs(vlan->vlan_tci) & ~VLAN_TAG_PRESENT);
271 /* 'src' is already properly masked. */
272 static void ether_addr_copy_masked(u8 *dst_, const u8 *src_, const u8 *mask_)
274 u16 *dst = (u16 *)dst_;
275 const u16 *src = (const u16 *)src_;
276 const u16 *mask = (const u16 *)mask_;
278 OVS_SET_MASKED(dst[0], src[0], mask[0]);
279 OVS_SET_MASKED(dst[1], src[1], mask[1]);
280 OVS_SET_MASKED(dst[2], src[2], mask[2]);
283 static int set_eth_addr(struct sk_buff *skb, struct sw_flow_key *flow_key,
284 const struct ovs_key_ethernet *key,
285 const struct ovs_key_ethernet *mask)
289 err = skb_ensure_writable(skb, ETH_HLEN);
293 skb_postpull_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
295 ether_addr_copy_masked(eth_hdr(skb)->h_source, key->eth_src,
297 ether_addr_copy_masked(eth_hdr(skb)->h_dest, key->eth_dst,
300 skb_postpush_rcsum(skb, eth_hdr(skb), ETH_ALEN * 2);
302 ether_addr_copy(flow_key->eth.src, eth_hdr(skb)->h_source);
303 ether_addr_copy(flow_key->eth.dst, eth_hdr(skb)->h_dest);
307 static void update_ip_l4_checksum(struct sk_buff *skb, struct iphdr *nh,
308 __be32 addr, __be32 new_addr)
310 int transport_len = skb->len - skb_transport_offset(skb);
312 if (nh->frag_off & htons(IP_OFFSET))
315 if (nh->protocol == IPPROTO_TCP) {
316 if (likely(transport_len >= sizeof(struct tcphdr)))
317 inet_proto_csum_replace4(&tcp_hdr(skb)->check, skb,
318 addr, new_addr, true);
319 } else if (nh->protocol == IPPROTO_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_replace4(&uh->check, skb,
325 addr, new_addr, true);
327 uh->check = CSUM_MANGLED_0;
333 static void set_ip_addr(struct sk_buff *skb, struct iphdr *nh,
334 __be32 *addr, __be32 new_addr)
336 update_ip_l4_checksum(skb, nh, *addr, new_addr);
337 csum_replace4(&nh->check, *addr, new_addr);
342 static void update_ipv6_checksum(struct sk_buff *skb, u8 l4_proto,
343 __be32 addr[4], const __be32 new_addr[4])
345 int transport_len = skb->len - skb_transport_offset(skb);
347 if (l4_proto == NEXTHDR_TCP) {
348 if (likely(transport_len >= sizeof(struct tcphdr)))
349 inet_proto_csum_replace16(&tcp_hdr(skb)->check, skb,
350 addr, new_addr, true);
351 } else if (l4_proto == NEXTHDR_UDP) {
352 if (likely(transport_len >= sizeof(struct udphdr))) {
353 struct udphdr *uh = udp_hdr(skb);
355 if (uh->check || skb->ip_summed == CHECKSUM_PARTIAL) {
356 inet_proto_csum_replace16(&uh->check, skb,
357 addr, new_addr, true);
359 uh->check = CSUM_MANGLED_0;
362 } else if (l4_proto == NEXTHDR_ICMP) {
363 if (likely(transport_len >= sizeof(struct icmp6hdr)))
364 inet_proto_csum_replace16(&icmp6_hdr(skb)->icmp6_cksum,
365 skb, addr, new_addr, true);
369 static void mask_ipv6_addr(const __be32 old[4], const __be32 addr[4],
370 const __be32 mask[4], __be32 masked[4])
372 masked[0] = OVS_MASKED(old[0], addr[0], mask[0]);
373 masked[1] = OVS_MASKED(old[1], addr[1], mask[1]);
374 masked[2] = OVS_MASKED(old[2], addr[2], mask[2]);
375 masked[3] = OVS_MASKED(old[3], addr[3], mask[3]);
378 static void set_ipv6_addr(struct sk_buff *skb, u8 l4_proto,
379 __be32 addr[4], const __be32 new_addr[4],
380 bool recalculate_csum)
382 if (recalculate_csum)
383 update_ipv6_checksum(skb, l4_proto, addr, new_addr);
386 memcpy(addr, new_addr, sizeof(__be32[4]));
389 static void set_ipv6_fl(struct ipv6hdr *nh, u32 fl, u32 mask)
391 /* Bits 21-24 are always unmasked, so this retains their values. */
392 OVS_SET_MASKED(nh->flow_lbl[0], (u8)(fl >> 16), (u8)(mask >> 16));
393 OVS_SET_MASKED(nh->flow_lbl[1], (u8)(fl >> 8), (u8)(mask >> 8));
394 OVS_SET_MASKED(nh->flow_lbl[2], (u8)fl, (u8)mask);
397 static void set_ip_ttl(struct sk_buff *skb, struct iphdr *nh, u8 new_ttl,
400 new_ttl = OVS_MASKED(nh->ttl, new_ttl, mask);
402 csum_replace2(&nh->check, htons(nh->ttl << 8), htons(new_ttl << 8));
406 static int set_ipv4(struct sk_buff *skb, struct sw_flow_key *flow_key,
407 const struct ovs_key_ipv4 *key,
408 const struct ovs_key_ipv4 *mask)
414 err = skb_ensure_writable(skb, skb_network_offset(skb) +
415 sizeof(struct iphdr));
421 /* Setting an IP addresses is typically only a side effect of
422 * matching on them in the current userspace implementation, so it
423 * makes sense to check if the value actually changed.
425 if (mask->ipv4_src) {
426 new_addr = OVS_MASKED(nh->saddr, key->ipv4_src, mask->ipv4_src);
428 if (unlikely(new_addr != nh->saddr)) {
429 set_ip_addr(skb, nh, &nh->saddr, new_addr);
430 flow_key->ipv4.addr.src = new_addr;
433 if (mask->ipv4_dst) {
434 new_addr = OVS_MASKED(nh->daddr, key->ipv4_dst, mask->ipv4_dst);
436 if (unlikely(new_addr != nh->daddr)) {
437 set_ip_addr(skb, nh, &nh->daddr, new_addr);
438 flow_key->ipv4.addr.dst = new_addr;
441 if (mask->ipv4_tos) {
442 ipv4_change_dsfield(nh, ~mask->ipv4_tos, key->ipv4_tos);
443 flow_key->ip.tos = nh->tos;
445 if (mask->ipv4_ttl) {
446 set_ip_ttl(skb, nh, key->ipv4_ttl, mask->ipv4_ttl);
447 flow_key->ip.ttl = nh->ttl;
453 static bool is_ipv6_mask_nonzero(const __be32 addr[4])
455 return !!(addr[0] | addr[1] | addr[2] | addr[3]);
458 static int set_ipv6(struct sk_buff *skb, struct sw_flow_key *flow_key,
459 const struct ovs_key_ipv6 *key,
460 const struct ovs_key_ipv6 *mask)
465 err = skb_ensure_writable(skb, skb_network_offset(skb) +
466 sizeof(struct ipv6hdr));
472 /* Setting an IP addresses is typically only a side effect of
473 * matching on them in the current userspace implementation, so it
474 * makes sense to check if the value actually changed.
476 if (is_ipv6_mask_nonzero(mask->ipv6_src)) {
477 __be32 *saddr = (__be32 *)&nh->saddr;
480 mask_ipv6_addr(saddr, key->ipv6_src, mask->ipv6_src, masked);
482 if (unlikely(memcmp(saddr, masked, sizeof(masked)))) {
483 set_ipv6_addr(skb, flow_key->ip.proto, saddr, masked,
485 memcpy(&flow_key->ipv6.addr.src, masked,
486 sizeof(flow_key->ipv6.addr.src));
489 if (is_ipv6_mask_nonzero(mask->ipv6_dst)) {
490 unsigned int offset = 0;
491 int flags = IP6_FH_F_SKIP_RH;
492 bool recalc_csum = true;
493 __be32 *daddr = (__be32 *)&nh->daddr;
496 mask_ipv6_addr(daddr, key->ipv6_dst, mask->ipv6_dst, masked);
498 if (unlikely(memcmp(daddr, masked, sizeof(masked)))) {
499 if (ipv6_ext_hdr(nh->nexthdr))
500 recalc_csum = (ipv6_find_hdr(skb, &offset,
505 set_ipv6_addr(skb, flow_key->ip.proto, daddr, masked,
507 memcpy(&flow_key->ipv6.addr.dst, masked,
508 sizeof(flow_key->ipv6.addr.dst));
511 if (mask->ipv6_tclass) {
512 ipv6_change_dsfield(nh, ~mask->ipv6_tclass, key->ipv6_tclass);
513 flow_key->ip.tos = ipv6_get_dsfield(nh);
515 if (mask->ipv6_label) {
516 set_ipv6_fl(nh, ntohl(key->ipv6_label),
517 ntohl(mask->ipv6_label));
518 flow_key->ipv6.label =
519 *(__be32 *)nh & htonl(IPV6_FLOWINFO_FLOWLABEL);
521 if (mask->ipv6_hlimit) {
522 OVS_SET_MASKED(nh->hop_limit, key->ipv6_hlimit,
524 flow_key->ip.ttl = nh->hop_limit;
529 /* Must follow skb_ensure_writable() since that can move the skb data. */
530 static void set_tp_port(struct sk_buff *skb, __be16 *port,
531 __be16 new_port, __sum16 *check)
533 inet_proto_csum_replace2(check, skb, *port, new_port, false);
537 static int set_udp(struct sk_buff *skb, struct sw_flow_key *flow_key,
538 const struct ovs_key_udp *key,
539 const struct ovs_key_udp *mask)
545 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
546 sizeof(struct udphdr));
551 /* Either of the masks is non-zero, so do not bother checking them. */
552 src = OVS_MASKED(uh->source, key->udp_src, mask->udp_src);
553 dst = OVS_MASKED(uh->dest, key->udp_dst, mask->udp_dst);
555 if (uh->check && skb->ip_summed != CHECKSUM_PARTIAL) {
556 if (likely(src != uh->source)) {
557 set_tp_port(skb, &uh->source, src, &uh->check);
558 flow_key->tp.src = src;
560 if (likely(dst != uh->dest)) {
561 set_tp_port(skb, &uh->dest, dst, &uh->check);
562 flow_key->tp.dst = dst;
565 if (unlikely(!uh->check))
566 uh->check = CSUM_MANGLED_0;
570 flow_key->tp.src = src;
571 flow_key->tp.dst = dst;
579 static int set_tcp(struct sk_buff *skb, struct sw_flow_key *flow_key,
580 const struct ovs_key_tcp *key,
581 const struct ovs_key_tcp *mask)
587 err = skb_ensure_writable(skb, skb_transport_offset(skb) +
588 sizeof(struct tcphdr));
593 src = OVS_MASKED(th->source, key->tcp_src, mask->tcp_src);
594 if (likely(src != th->source)) {
595 set_tp_port(skb, &th->source, src, &th->check);
596 flow_key->tp.src = src;
598 dst = OVS_MASKED(th->dest, key->tcp_dst, mask->tcp_dst);
599 if (likely(dst != th->dest)) {
600 set_tp_port(skb, &th->dest, dst, &th->check);
601 flow_key->tp.dst = dst;
608 static int set_sctp(struct sk_buff *skb, struct sw_flow_key *flow_key,
609 const struct ovs_key_sctp *key,
610 const struct ovs_key_sctp *mask)
612 unsigned int sctphoff = skb_transport_offset(skb);
614 __le32 old_correct_csum, new_csum, old_csum;
617 err = skb_ensure_writable(skb, sctphoff + sizeof(struct sctphdr));
622 old_csum = sh->checksum;
623 old_correct_csum = sctp_compute_cksum(skb, sctphoff);
625 sh->source = OVS_MASKED(sh->source, key->sctp_src, mask->sctp_src);
626 sh->dest = OVS_MASKED(sh->dest, key->sctp_dst, mask->sctp_dst);
628 new_csum = sctp_compute_cksum(skb, sctphoff);
630 /* Carry any checksum errors through. */
631 sh->checksum = old_csum ^ old_correct_csum ^ new_csum;
634 flow_key->tp.src = sh->source;
635 flow_key->tp.dst = sh->dest;
640 static int ovs_vport_output(struct net *net, struct sock *sk, struct sk_buff *skb)
642 struct ovs_frag_data *data = this_cpu_ptr(&ovs_frag_data_storage);
643 struct vport *vport = data->vport;
645 if (skb_cow_head(skb, data->l2_len) < 0) {
650 __skb_dst_copy(skb, data->dst);
651 *OVS_CB(skb) = data->cb;
652 skb->inner_protocol = data->inner_protocol;
653 skb->vlan_tci = data->vlan_tci;
654 skb->vlan_proto = data->vlan_proto;
656 /* Reconstruct the MAC header. */
657 skb_push(skb, data->l2_len);
658 memcpy(skb->data, &data->l2_data, data->l2_len);
659 skb_postpush_rcsum(skb, skb->data, data->l2_len);
660 skb_reset_mac_header(skb);
662 ovs_vport_send(vport, skb);
667 ovs_dst_get_mtu(const struct dst_entry *dst)
669 return dst->dev->mtu;
672 static struct dst_ops ovs_dst_ops = {
674 .mtu = ovs_dst_get_mtu,
677 /* prepare_frag() is called once per (larger-than-MTU) frame; its inverse is
678 * ovs_vport_output(), which is called once per fragmented packet.
680 static void prepare_frag(struct vport *vport, struct sk_buff *skb)
682 unsigned int hlen = skb_network_offset(skb);
683 struct ovs_frag_data *data;
685 data = this_cpu_ptr(&ovs_frag_data_storage);
686 data->dst = skb->_skb_refdst;
688 data->cb = *OVS_CB(skb);
689 data->inner_protocol = skb->inner_protocol;
690 data->vlan_tci = skb->vlan_tci;
691 data->vlan_proto = skb->vlan_proto;
693 memcpy(&data->l2_data, skb->data, hlen);
695 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
699 static void ovs_fragment(struct net *net, struct vport *vport,
700 struct sk_buff *skb, u16 mru, __be16 ethertype)
702 if (skb_network_offset(skb) > MAX_L2_LEN) {
703 OVS_NLERR(1, "L2 header too long to fragment");
707 if (ethertype == htons(ETH_P_IP)) {
708 struct dst_entry ovs_dst;
709 unsigned long orig_dst;
711 prepare_frag(vport, skb);
712 dst_init(&ovs_dst, &ovs_dst_ops, NULL, 1,
713 DST_OBSOLETE_NONE, DST_NOCOUNT);
714 ovs_dst.dev = vport->dev;
716 orig_dst = skb->_skb_refdst;
717 skb_dst_set_noref(skb, &ovs_dst);
718 IPCB(skb)->frag_max_size = mru;
720 ip_do_fragment(net, skb->sk, skb, ovs_vport_output);
721 refdst_drop(orig_dst);
722 } else if (ethertype == htons(ETH_P_IPV6)) {
723 const struct nf_ipv6_ops *v6ops = nf_get_ipv6_ops();
724 unsigned long orig_dst;
725 struct rt6_info ovs_rt;
731 prepare_frag(vport, skb);
732 memset(&ovs_rt, 0, sizeof(ovs_rt));
733 dst_init(&ovs_rt.dst, &ovs_dst_ops, NULL, 1,
734 DST_OBSOLETE_NONE, DST_NOCOUNT);
735 ovs_rt.dst.dev = vport->dev;
737 orig_dst = skb->_skb_refdst;
738 skb_dst_set_noref(skb, &ovs_rt.dst);
739 IP6CB(skb)->frag_max_size = mru;
741 v6ops->fragment(net, skb->sk, skb, ovs_vport_output);
742 refdst_drop(orig_dst);
744 WARN_ONCE(1, "Failed fragment ->%s: eth=%04x, MRU=%d, MTU=%d.",
745 ovs_vport_name(vport), ntohs(ethertype), mru,
755 static void do_output(struct datapath *dp, struct sk_buff *skb, int out_port,
756 struct sw_flow_key *key)
758 struct vport *vport = ovs_vport_rcu(dp, out_port);
761 u16 mru = OVS_CB(skb)->mru;
762 u32 cutlen = OVS_CB(skb)->cutlen;
764 if (unlikely(cutlen > 0)) {
765 if (skb->len - cutlen > ETH_HLEN)
766 pskb_trim(skb, skb->len - cutlen);
768 pskb_trim(skb, ETH_HLEN);
771 if (likely(!mru || (skb->len <= mru + ETH_HLEN))) {
772 ovs_vport_send(vport, skb);
773 } else if (mru <= vport->dev->mtu) {
774 struct net *net = read_pnet(&dp->net);
775 __be16 ethertype = key->eth.type;
777 if (!is_flow_key_valid(key)) {
778 if (eth_p_mpls(skb->protocol))
779 ethertype = skb->inner_protocol;
781 ethertype = vlan_get_protocol(skb);
784 ovs_fragment(net, vport, skb, mru, ethertype);
793 static int output_userspace(struct datapath *dp, struct sk_buff *skb,
794 struct sw_flow_key *key, const struct nlattr *attr,
795 const struct nlattr *actions, int actions_len,
798 struct dp_upcall_info upcall;
799 const struct nlattr *a;
802 memset(&upcall, 0, sizeof(upcall));
803 upcall.cmd = OVS_PACKET_CMD_ACTION;
804 upcall.mru = OVS_CB(skb)->mru;
806 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
807 a = nla_next(a, &rem)) {
808 switch (nla_type(a)) {
809 case OVS_USERSPACE_ATTR_USERDATA:
813 case OVS_USERSPACE_ATTR_PID:
814 upcall.portid = nla_get_u32(a);
817 case OVS_USERSPACE_ATTR_EGRESS_TUN_PORT: {
818 /* Get out tunnel info. */
821 vport = ovs_vport_rcu(dp, nla_get_u32(a));
825 err = dev_fill_metadata_dst(vport->dev, skb);
827 upcall.egress_tun_info = skb_tunnel_info(skb);
833 case OVS_USERSPACE_ATTR_ACTIONS: {
834 /* Include actions. */
835 upcall.actions = actions;
836 upcall.actions_len = actions_len;
840 } /* End of switch. */
843 return ovs_dp_upcall(dp, skb, key, &upcall, cutlen);
846 static int sample(struct datapath *dp, struct sk_buff *skb,
847 struct sw_flow_key *key, const struct nlattr *attr,
848 const struct nlattr *actions, int actions_len)
850 const struct nlattr *acts_list = NULL;
851 const struct nlattr *a;
855 for (a = nla_data(attr), rem = nla_len(attr); rem > 0;
856 a = nla_next(a, &rem)) {
859 switch (nla_type(a)) {
860 case OVS_SAMPLE_ATTR_PROBABILITY:
861 probability = nla_get_u32(a);
862 if (!probability || prandom_u32() > probability)
866 case OVS_SAMPLE_ATTR_ACTIONS:
872 rem = nla_len(acts_list);
873 a = nla_data(acts_list);
875 /* Actions list is empty, do nothing */
879 /* The only known usage of sample action is having a single user-space
880 * action, or having a truncate action followed by a single user-space
881 * action. Treat this usage as a special case.
882 * The output_userspace() should clone the skb to be sent to the
883 * user space. This skb will be consumed by its caller.
885 if (unlikely(nla_type(a) == OVS_ACTION_ATTR_TRUNC)) {
886 struct ovs_action_trunc *trunc = nla_data(a);
888 if (skb->len > trunc->max_len)
889 cutlen = skb->len - trunc->max_len;
891 a = nla_next(a, &rem);
894 if (likely(nla_type(a) == OVS_ACTION_ATTR_USERSPACE &&
895 nla_is_last(a, rem)))
896 return output_userspace(dp, skb, key, a, actions,
897 actions_len, cutlen);
899 skb = skb_clone(skb, GFP_ATOMIC);
901 /* Skip the sample action when out of memory. */
904 if (!add_deferred_actions(skb, key, a)) {
906 pr_warn("%s: deferred actions limit reached, dropping sample action\n",
914 static void execute_hash(struct sk_buff *skb, struct sw_flow_key *key,
915 const struct nlattr *attr)
917 struct ovs_action_hash *hash_act = nla_data(attr);
920 /* OVS_HASH_ALG_L4 is the only possible hash algorithm. */
921 hash = skb_get_hash(skb);
922 hash = jhash_1word(hash, hash_act->hash_basis);
926 key->ovs_flow_hash = hash;
929 static int execute_set_action(struct sk_buff *skb,
930 struct sw_flow_key *flow_key,
931 const struct nlattr *a)
933 /* Only tunnel set execution is supported without a mask. */
934 if (nla_type(a) == OVS_KEY_ATTR_TUNNEL_INFO) {
935 struct ovs_tunnel_info *tun = nla_data(a);
938 dst_hold((struct dst_entry *)tun->tun_dst);
939 skb_dst_set(skb, (struct dst_entry *)tun->tun_dst);
946 /* Mask is at the midpoint of the data. */
947 #define get_mask(a, type) ((const type)nla_data(a) + 1)
949 static int execute_masked_set_action(struct sk_buff *skb,
950 struct sw_flow_key *flow_key,
951 const struct nlattr *a)
955 switch (nla_type(a)) {
956 case OVS_KEY_ATTR_PRIORITY:
957 OVS_SET_MASKED(skb->priority, nla_get_u32(a),
958 *get_mask(a, u32 *));
959 flow_key->phy.priority = skb->priority;
962 case OVS_KEY_ATTR_SKB_MARK:
963 OVS_SET_MASKED(skb->mark, nla_get_u32(a), *get_mask(a, u32 *));
964 flow_key->phy.skb_mark = skb->mark;
967 case OVS_KEY_ATTR_TUNNEL_INFO:
968 /* Masked data not supported for tunnel. */
972 case OVS_KEY_ATTR_ETHERNET:
973 err = set_eth_addr(skb, flow_key, nla_data(a),
974 get_mask(a, struct ovs_key_ethernet *));
977 case OVS_KEY_ATTR_IPV4:
978 err = set_ipv4(skb, flow_key, nla_data(a),
979 get_mask(a, struct ovs_key_ipv4 *));
982 case OVS_KEY_ATTR_IPV6:
983 err = set_ipv6(skb, flow_key, nla_data(a),
984 get_mask(a, struct ovs_key_ipv6 *));
987 case OVS_KEY_ATTR_TCP:
988 err = set_tcp(skb, flow_key, nla_data(a),
989 get_mask(a, struct ovs_key_tcp *));
992 case OVS_KEY_ATTR_UDP:
993 err = set_udp(skb, flow_key, nla_data(a),
994 get_mask(a, struct ovs_key_udp *));
997 case OVS_KEY_ATTR_SCTP:
998 err = set_sctp(skb, flow_key, nla_data(a),
999 get_mask(a, struct ovs_key_sctp *));
1002 case OVS_KEY_ATTR_MPLS:
1003 err = set_mpls(skb, flow_key, nla_data(a), get_mask(a,
1007 case OVS_KEY_ATTR_CT_STATE:
1008 case OVS_KEY_ATTR_CT_ZONE:
1009 case OVS_KEY_ATTR_CT_MARK:
1010 case OVS_KEY_ATTR_CT_LABELS:
1018 static int execute_recirc(struct datapath *dp, struct sk_buff *skb,
1019 struct sw_flow_key *key,
1020 const struct nlattr *a, int rem)
1022 struct deferred_action *da;
1024 if (!is_flow_key_valid(key)) {
1027 err = ovs_flow_key_update(skb, key);
1031 BUG_ON(!is_flow_key_valid(key));
1033 if (!nla_is_last(a, rem)) {
1034 /* Recirc action is the not the last action
1035 * of the action list, need to clone the skb.
1037 skb = skb_clone(skb, GFP_ATOMIC);
1039 /* Skip the recirc action when out of memory, but
1040 * continue on with the rest of the action list.
1046 da = add_deferred_actions(skb, key, NULL);
1048 da->pkt_key.recirc_id = nla_get_u32(a);
1052 if (net_ratelimit())
1053 pr_warn("%s: deferred action limit reached, drop recirc action\n",
1060 /* Execute a list of actions against 'skb'. */
1061 static int do_execute_actions(struct datapath *dp, struct sk_buff *skb,
1062 struct sw_flow_key *key,
1063 const struct nlattr *attr, int len)
1065 /* Every output action needs a separate clone of 'skb', but the common
1066 * case is just a single output action, so that doing a clone and
1067 * then freeing the original skbuff is wasteful. So the following code
1068 * is slightly obscure just to avoid that.
1071 const struct nlattr *a;
1074 for (a = attr, rem = len; rem > 0;
1075 a = nla_next(a, &rem)) {
1078 if (unlikely(prev_port != -1)) {
1079 struct sk_buff *out_skb = skb_clone(skb, GFP_ATOMIC);
1082 do_output(dp, out_skb, prev_port, key);
1084 OVS_CB(skb)->cutlen = 0;
1088 switch (nla_type(a)) {
1089 case OVS_ACTION_ATTR_OUTPUT:
1090 prev_port = nla_get_u32(a);
1093 case OVS_ACTION_ATTR_TRUNC: {
1094 struct ovs_action_trunc *trunc = nla_data(a);
1096 if (skb->len > trunc->max_len)
1097 OVS_CB(skb)->cutlen = skb->len - trunc->max_len;
1101 case OVS_ACTION_ATTR_USERSPACE:
1102 output_userspace(dp, skb, key, a, attr,
1103 len, OVS_CB(skb)->cutlen);
1104 OVS_CB(skb)->cutlen = 0;
1107 case OVS_ACTION_ATTR_HASH:
1108 execute_hash(skb, key, a);
1111 case OVS_ACTION_ATTR_PUSH_MPLS:
1112 err = push_mpls(skb, key, nla_data(a));
1115 case OVS_ACTION_ATTR_POP_MPLS:
1116 err = pop_mpls(skb, key, nla_get_be16(a));
1119 case OVS_ACTION_ATTR_PUSH_VLAN:
1120 err = push_vlan(skb, key, nla_data(a));
1123 case OVS_ACTION_ATTR_POP_VLAN:
1124 err = pop_vlan(skb, key);
1127 case OVS_ACTION_ATTR_RECIRC:
1128 err = execute_recirc(dp, skb, key, a, rem);
1129 if (nla_is_last(a, rem)) {
1130 /* If this is the last action, the skb has
1131 * been consumed or freed.
1132 * Return immediately.
1138 case OVS_ACTION_ATTR_SET:
1139 err = execute_set_action(skb, key, nla_data(a));
1142 case OVS_ACTION_ATTR_SET_MASKED:
1143 case OVS_ACTION_ATTR_SET_TO_MASKED:
1144 err = execute_masked_set_action(skb, key, nla_data(a));
1147 case OVS_ACTION_ATTR_SAMPLE:
1148 err = sample(dp, skb, key, a, attr, len);
1151 case OVS_ACTION_ATTR_CT:
1152 if (!is_flow_key_valid(key)) {
1153 err = ovs_flow_key_update(skb, key);
1158 err = ovs_ct_execute(ovs_dp_get_net(dp), skb, key,
1161 /* Hide stolen IP fragments from user space. */
1163 return err == -EINPROGRESS ? 0 : err;
1167 if (unlikely(err)) {
1173 if (prev_port != -1)
1174 do_output(dp, skb, prev_port, key);
1181 static void process_deferred_actions(struct datapath *dp)
1183 struct action_fifo *fifo = this_cpu_ptr(action_fifos);
1185 /* Do not touch the FIFO in case there is no deferred actions. */
1186 if (action_fifo_is_empty(fifo))
1189 /* Finishing executing all deferred actions. */
1191 struct deferred_action *da = action_fifo_get(fifo);
1192 struct sk_buff *skb = da->skb;
1193 struct sw_flow_key *key = &da->pkt_key;
1194 const struct nlattr *actions = da->actions;
1197 do_execute_actions(dp, skb, key, actions,
1200 ovs_dp_process_packet(skb, key);
1201 } while (!action_fifo_is_empty(fifo));
1203 /* Reset FIFO for the next packet. */
1204 action_fifo_init(fifo);
1207 /* Execute a list of actions against 'skb'. */
1208 int ovs_execute_actions(struct datapath *dp, struct sk_buff *skb,
1209 const struct sw_flow_actions *acts,
1210 struct sw_flow_key *key)
1212 static const int ovs_recursion_limit = 5;
1215 level = __this_cpu_inc_return(exec_actions_level);
1216 if (unlikely(level > ovs_recursion_limit)) {
1217 net_crit_ratelimited("ovs: recursion limit reached on datapath %s, probable configuration error\n",
1224 err = do_execute_actions(dp, skb, key,
1225 acts->actions, acts->actions_len);
1228 process_deferred_actions(dp);
1231 __this_cpu_dec(exec_actions_level);
1235 int action_fifos_init(void)
1237 action_fifos = alloc_percpu(struct action_fifo);
1244 void action_fifos_exit(void)
1246 free_percpu(action_fifos);