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Linux/net/openvswitch/conntrack.c

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  1 /*
  2  * Copyright (c) 2015 Nicira, Inc.
  3  *
  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.
  7  *
  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.
 12  */
 13 
 14 #include <linux/module.h>
 15 #include <linux/openvswitch.h>
 16 #include <linux/tcp.h>
 17 #include <linux/udp.h>
 18 #include <linux/sctp.h>
 19 #include <net/ip.h>
 20 #include <net/netfilter/nf_conntrack_core.h>
 21 #include <net/netfilter/nf_conntrack_helper.h>
 22 #include <net/netfilter/nf_conntrack_labels.h>
 23 #include <net/netfilter/nf_conntrack_seqadj.h>
 24 #include <net/netfilter/nf_conntrack_zones.h>
 25 #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
 26 
 27 #ifdef CONFIG_NF_NAT_NEEDED
 28 #include <linux/netfilter/nf_nat.h>
 29 #include <net/netfilter/nf_nat_core.h>
 30 #include <net/netfilter/nf_nat_l3proto.h>
 31 #endif
 32 
 33 #include "datapath.h"
 34 #include "conntrack.h"
 35 #include "flow.h"
 36 #include "flow_netlink.h"
 37 
 38 struct ovs_ct_len_tbl {
 39         int maxlen;
 40         int minlen;
 41 };
 42 
 43 /* Metadata mark for masked write to conntrack mark */
 44 struct md_mark {
 45         u32 value;
 46         u32 mask;
 47 };
 48 
 49 /* Metadata label for masked write to conntrack label. */
 50 struct md_labels {
 51         struct ovs_key_ct_labels value;
 52         struct ovs_key_ct_labels mask;
 53 };
 54 
 55 enum ovs_ct_nat {
 56         OVS_CT_NAT = 1 << 0,     /* NAT for committed connections only. */
 57         OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
 58         OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
 59 };
 60 
 61 /* Conntrack action context for execution. */
 62 struct ovs_conntrack_info {
 63         struct nf_conntrack_helper *helper;
 64         struct nf_conntrack_zone zone;
 65         struct nf_conn *ct;
 66         u8 commit : 1;
 67         u8 nat : 3;                 /* enum ovs_ct_nat */
 68         u16 family;
 69         struct md_mark mark;
 70         struct md_labels labels;
 71 #ifdef CONFIG_NF_NAT_NEEDED
 72         struct nf_nat_range range;  /* Only present for SRC NAT and DST NAT. */
 73 #endif
 74 };
 75 
 76 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
 77 
 78 static u16 key_to_nfproto(const struct sw_flow_key *key)
 79 {
 80         switch (ntohs(key->eth.type)) {
 81         case ETH_P_IP:
 82                 return NFPROTO_IPV4;
 83         case ETH_P_IPV6:
 84                 return NFPROTO_IPV6;
 85         default:
 86                 return NFPROTO_UNSPEC;
 87         }
 88 }
 89 
 90 /* Map SKB connection state into the values used by flow definition. */
 91 static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
 92 {
 93         u8 ct_state = OVS_CS_F_TRACKED;
 94 
 95         switch (ctinfo) {
 96         case IP_CT_ESTABLISHED_REPLY:
 97         case IP_CT_RELATED_REPLY:
 98                 ct_state |= OVS_CS_F_REPLY_DIR;
 99                 break;
100         default:
101                 break;
102         }
103 
104         switch (ctinfo) {
105         case IP_CT_ESTABLISHED:
106         case IP_CT_ESTABLISHED_REPLY:
107                 ct_state |= OVS_CS_F_ESTABLISHED;
108                 break;
109         case IP_CT_RELATED:
110         case IP_CT_RELATED_REPLY:
111                 ct_state |= OVS_CS_F_RELATED;
112                 break;
113         case IP_CT_NEW:
114                 ct_state |= OVS_CS_F_NEW;
115                 break;
116         default:
117                 break;
118         }
119 
120         return ct_state;
121 }
122 
123 static u32 ovs_ct_get_mark(const struct nf_conn *ct)
124 {
125 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
126         return ct ? ct->mark : 0;
127 #else
128         return 0;
129 #endif
130 }
131 
132 static void ovs_ct_get_labels(const struct nf_conn *ct,
133                               struct ovs_key_ct_labels *labels)
134 {
135         struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
136 
137         if (cl) {
138                 size_t len = sizeof(cl->bits);
139 
140                 if (len > OVS_CT_LABELS_LEN)
141                         len = OVS_CT_LABELS_LEN;
142                 else if (len < OVS_CT_LABELS_LEN)
143                         memset(labels, 0, OVS_CT_LABELS_LEN);
144                 memcpy(labels, cl->bits, len);
145         } else {
146                 memset(labels, 0, OVS_CT_LABELS_LEN);
147         }
148 }
149 
150 static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
151                                 const struct nf_conntrack_zone *zone,
152                                 const struct nf_conn *ct)
153 {
154         key->ct.state = state;
155         key->ct.zone = zone->id;
156         key->ct.mark = ovs_ct_get_mark(ct);
157         ovs_ct_get_labels(ct, &key->ct.labels);
158 }
159 
160 /* Update 'key' based on skb->nfct.  If 'post_ct' is true, then OVS has
161  * previously sent the packet to conntrack via the ct action.  If
162  * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
163  * initialized from the connection status.
164  */
165 static void ovs_ct_update_key(const struct sk_buff *skb,
166                               const struct ovs_conntrack_info *info,
167                               struct sw_flow_key *key, bool post_ct,
168                               bool keep_nat_flags)
169 {
170         const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
171         enum ip_conntrack_info ctinfo;
172         struct nf_conn *ct;
173         u8 state = 0;
174 
175         ct = nf_ct_get(skb, &ctinfo);
176         if (ct) {
177                 state = ovs_ct_get_state(ctinfo);
178                 /* All unconfirmed entries are NEW connections. */
179                 if (!nf_ct_is_confirmed(ct))
180                         state |= OVS_CS_F_NEW;
181                 /* OVS persists the related flag for the duration of the
182                  * connection.
183                  */
184                 if (ct->master)
185                         state |= OVS_CS_F_RELATED;
186                 if (keep_nat_flags) {
187                         state |= key->ct.state & OVS_CS_F_NAT_MASK;
188                 } else {
189                         if (ct->status & IPS_SRC_NAT)
190                                 state |= OVS_CS_F_SRC_NAT;
191                         if (ct->status & IPS_DST_NAT)
192                                 state |= OVS_CS_F_DST_NAT;
193                 }
194                 zone = nf_ct_zone(ct);
195         } else if (post_ct) {
196                 state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
197                 if (info)
198                         zone = &info->zone;
199         }
200         __ovs_ct_update_key(key, state, zone, ct);
201 }
202 
203 /* This is called to initialize CT key fields possibly coming in from the local
204  * stack.
205  */
206 void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
207 {
208         ovs_ct_update_key(skb, NULL, key, false, false);
209 }
210 
211 int ovs_ct_put_key(const struct sw_flow_key *key, struct sk_buff *skb)
212 {
213         if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, key->ct.state))
214                 return -EMSGSIZE;
215 
216         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
217             nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, key->ct.zone))
218                 return -EMSGSIZE;
219 
220         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
221             nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, key->ct.mark))
222                 return -EMSGSIZE;
223 
224         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
225             nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(key->ct.labels),
226                     &key->ct.labels))
227                 return -EMSGSIZE;
228 
229         return 0;
230 }
231 
232 static int ovs_ct_set_mark(struct sk_buff *skb, struct sw_flow_key *key,
233                            u32 ct_mark, u32 mask)
234 {
235 #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
236         enum ip_conntrack_info ctinfo;
237         struct nf_conn *ct;
238         u32 new_mark;
239 
240         /* The connection could be invalid, in which case set_mark is no-op. */
241         ct = nf_ct_get(skb, &ctinfo);
242         if (!ct)
243                 return 0;
244 
245         new_mark = ct_mark | (ct->mark & ~(mask));
246         if (ct->mark != new_mark) {
247                 ct->mark = new_mark;
248                 nf_conntrack_event_cache(IPCT_MARK, ct);
249                 key->ct.mark = new_mark;
250         }
251 
252         return 0;
253 #else
254         return -ENOTSUPP;
255 #endif
256 }
257 
258 static int ovs_ct_set_labels(struct sk_buff *skb, struct sw_flow_key *key,
259                              const struct ovs_key_ct_labels *labels,
260                              const struct ovs_key_ct_labels *mask)
261 {
262         enum ip_conntrack_info ctinfo;
263         struct nf_conn_labels *cl;
264         struct nf_conn *ct;
265         int err;
266 
267         /* The connection could be invalid, in which case set_label is no-op.*/
268         ct = nf_ct_get(skb, &ctinfo);
269         if (!ct)
270                 return 0;
271 
272         cl = nf_ct_labels_find(ct);
273         if (!cl) {
274                 nf_ct_labels_ext_add(ct);
275                 cl = nf_ct_labels_find(ct);
276         }
277         if (!cl || sizeof(cl->bits) < OVS_CT_LABELS_LEN)
278                 return -ENOSPC;
279 
280         err = nf_connlabels_replace(ct, (u32 *)labels, (u32 *)mask,
281                                     OVS_CT_LABELS_LEN / sizeof(u32));
282         if (err)
283                 return err;
284 
285         ovs_ct_get_labels(ct, &key->ct.labels);
286         return 0;
287 }
288 
289 /* 'skb' should already be pulled to nh_ofs. */
290 static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
291 {
292         const struct nf_conntrack_helper *helper;
293         const struct nf_conn_help *help;
294         enum ip_conntrack_info ctinfo;
295         unsigned int protoff;
296         struct nf_conn *ct;
297         int err;
298 
299         ct = nf_ct_get(skb, &ctinfo);
300         if (!ct || ctinfo == IP_CT_RELATED_REPLY)
301                 return NF_ACCEPT;
302 
303         help = nfct_help(ct);
304         if (!help)
305                 return NF_ACCEPT;
306 
307         helper = rcu_dereference(help->helper);
308         if (!helper)
309                 return NF_ACCEPT;
310 
311         switch (proto) {
312         case NFPROTO_IPV4:
313                 protoff = ip_hdrlen(skb);
314                 break;
315         case NFPROTO_IPV6: {
316                 u8 nexthdr = ipv6_hdr(skb)->nexthdr;
317                 __be16 frag_off;
318                 int ofs;
319 
320                 ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
321                                        &frag_off);
322                 if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
323                         pr_debug("proto header not found\n");
324                         return NF_ACCEPT;
325                 }
326                 protoff = ofs;
327                 break;
328         }
329         default:
330                 WARN_ONCE(1, "helper invoked on non-IP family!");
331                 return NF_DROP;
332         }
333 
334         err = helper->help(skb, protoff, ct, ctinfo);
335         if (err != NF_ACCEPT)
336                 return err;
337 
338         /* Adjust seqs after helper.  This is needed due to some helpers (e.g.,
339          * FTP with NAT) adusting the TCP payload size when mangling IP
340          * addresses and/or port numbers in the text-based control connection.
341          */
342         if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
343             !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
344                 return NF_DROP;
345         return NF_ACCEPT;
346 }
347 
348 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
349  * value if 'skb' is freed.
350  */
351 static int handle_fragments(struct net *net, struct sw_flow_key *key,
352                             u16 zone, struct sk_buff *skb)
353 {
354         struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
355         int err;
356 
357         if (key->eth.type == htons(ETH_P_IP)) {
358                 enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
359 
360                 memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
361                 err = ip_defrag(net, skb, user);
362                 if (err)
363                         return err;
364 
365                 ovs_cb.mru = IPCB(skb)->frag_max_size;
366 #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
367         } else if (key->eth.type == htons(ETH_P_IPV6)) {
368                 enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
369 
370                 skb_orphan(skb);
371                 memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
372                 err = nf_ct_frag6_gather(net, skb, user);
373                 if (err)
374                         return err;
375 
376                 key->ip.proto = ipv6_hdr(skb)->nexthdr;
377                 ovs_cb.mru = IP6CB(skb)->frag_max_size;
378 #endif
379         } else {
380                 kfree_skb(skb);
381                 return -EPFNOSUPPORT;
382         }
383 
384         key->ip.frag = OVS_FRAG_TYPE_NONE;
385         skb_clear_hash(skb);
386         skb->ignore_df = 1;
387         *OVS_CB(skb) = ovs_cb;
388 
389         return 0;
390 }
391 
392 static struct nf_conntrack_expect *
393 ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
394                    u16 proto, const struct sk_buff *skb)
395 {
396         struct nf_conntrack_tuple tuple;
397 
398         if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
399                 return NULL;
400         return __nf_ct_expect_find(net, zone, &tuple);
401 }
402 
403 /* This replicates logic from nf_conntrack_core.c that is not exported. */
404 static enum ip_conntrack_info
405 ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
406 {
407         const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
408 
409         if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
410                 return IP_CT_ESTABLISHED_REPLY;
411         /* Once we've had two way comms, always ESTABLISHED. */
412         if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
413                 return IP_CT_ESTABLISHED;
414         if (test_bit(IPS_EXPECTED_BIT, &ct->status))
415                 return IP_CT_RELATED;
416         return IP_CT_NEW;
417 }
418 
419 /* Find an existing connection which this packet belongs to without
420  * re-attributing statistics or modifying the connection state.  This allows an
421  * skb->nfct lost due to an upcall to be recovered during actions execution.
422  *
423  * Must be called with rcu_read_lock.
424  *
425  * On success, populates skb->nfct and skb->nfctinfo, and returns the
426  * connection.  Returns NULL if there is no existing entry.
427  */
428 static struct nf_conn *
429 ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
430                      u8 l3num, struct sk_buff *skb)
431 {
432         struct nf_conntrack_l3proto *l3proto;
433         struct nf_conntrack_l4proto *l4proto;
434         struct nf_conntrack_tuple tuple;
435         struct nf_conntrack_tuple_hash *h;
436         struct nf_conn *ct;
437         unsigned int dataoff;
438         u8 protonum;
439 
440         l3proto = __nf_ct_l3proto_find(l3num);
441         if (l3proto->get_l4proto(skb, skb_network_offset(skb), &dataoff,
442                                  &protonum) <= 0) {
443                 pr_debug("ovs_ct_find_existing: Can't get protonum\n");
444                 return NULL;
445         }
446         l4proto = __nf_ct_l4proto_find(l3num, protonum);
447         if (!nf_ct_get_tuple(skb, skb_network_offset(skb), dataoff, l3num,
448                              protonum, net, &tuple, l3proto, l4proto)) {
449                 pr_debug("ovs_ct_find_existing: Can't get tuple\n");
450                 return NULL;
451         }
452 
453         /* look for tuple match */
454         h = nf_conntrack_find_get(net, zone, &tuple);
455         if (!h)
456                 return NULL;   /* Not found. */
457 
458         ct = nf_ct_tuplehash_to_ctrack(h);
459 
460         skb->nfct = &ct->ct_general;
461         skb->nfctinfo = ovs_ct_get_info(h);
462         return ct;
463 }
464 
465 /* Determine whether skb->nfct is equal to the result of conntrack lookup. */
466 static bool skb_nfct_cached(struct net *net,
467                             const struct sw_flow_key *key,
468                             const struct ovs_conntrack_info *info,
469                             struct sk_buff *skb)
470 {
471         enum ip_conntrack_info ctinfo;
472         struct nf_conn *ct;
473 
474         ct = nf_ct_get(skb, &ctinfo);
475         /* If no ct, check if we have evidence that an existing conntrack entry
476          * might be found for this skb.  This happens when we lose a skb->nfct
477          * due to an upcall.  If the connection was not confirmed, it is not
478          * cached and needs to be run through conntrack again.
479          */
480         if (!ct && key->ct.state & OVS_CS_F_TRACKED &&
481             !(key->ct.state & OVS_CS_F_INVALID) &&
482             key->ct.zone == info->zone.id)
483                 ct = ovs_ct_find_existing(net, &info->zone, info->family, skb);
484         if (!ct)
485                 return false;
486         if (!net_eq(net, read_pnet(&ct->ct_net)))
487                 return false;
488         if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
489                 return false;
490         if (info->helper) {
491                 struct nf_conn_help *help;
492 
493                 help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
494                 if (help && rcu_access_pointer(help->helper) != info->helper)
495                         return false;
496         }
497 
498         return true;
499 }
500 
501 #ifdef CONFIG_NF_NAT_NEEDED
502 /* Modelled after nf_nat_ipv[46]_fn().
503  * range is only used for new, uninitialized NAT state.
504  * Returns either NF_ACCEPT or NF_DROP.
505  */
506 static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
507                               enum ip_conntrack_info ctinfo,
508                               const struct nf_nat_range *range,
509                               enum nf_nat_manip_type maniptype)
510 {
511         int hooknum, nh_off, err = NF_ACCEPT;
512 
513         nh_off = skb_network_offset(skb);
514         skb_pull(skb, nh_off);
515 
516         /* See HOOK2MANIP(). */
517         if (maniptype == NF_NAT_MANIP_SRC)
518                 hooknum = NF_INET_LOCAL_IN; /* Source NAT */
519         else
520                 hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
521 
522         switch (ctinfo) {
523         case IP_CT_RELATED:
524         case IP_CT_RELATED_REPLY:
525                 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
526                     skb->protocol == htons(ETH_P_IP) &&
527                     ip_hdr(skb)->protocol == IPPROTO_ICMP) {
528                         if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
529                                                            hooknum))
530                                 err = NF_DROP;
531                         goto push;
532                 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
533                            skb->protocol == htons(ETH_P_IPV6)) {
534                         __be16 frag_off;
535                         u8 nexthdr = ipv6_hdr(skb)->nexthdr;
536                         int hdrlen = ipv6_skip_exthdr(skb,
537                                                       sizeof(struct ipv6hdr),
538                                                       &nexthdr, &frag_off);
539 
540                         if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
541                                 if (!nf_nat_icmpv6_reply_translation(skb, ct,
542                                                                      ctinfo,
543                                                                      hooknum,
544                                                                      hdrlen))
545                                         err = NF_DROP;
546                                 goto push;
547                         }
548                 }
549                 /* Non-ICMP, fall thru to initialize if needed. */
550         case IP_CT_NEW:
551                 /* Seen it before?  This can happen for loopback, retrans,
552                  * or local packets.
553                  */
554                 if (!nf_nat_initialized(ct, maniptype)) {
555                         /* Initialize according to the NAT action. */
556                         err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
557                                 /* Action is set up to establish a new
558                                  * mapping.
559                                  */
560                                 ? nf_nat_setup_info(ct, range, maniptype)
561                                 : nf_nat_alloc_null_binding(ct, hooknum);
562                         if (err != NF_ACCEPT)
563                                 goto push;
564                 }
565                 break;
566 
567         case IP_CT_ESTABLISHED:
568         case IP_CT_ESTABLISHED_REPLY:
569                 break;
570 
571         default:
572                 err = NF_DROP;
573                 goto push;
574         }
575 
576         err = nf_nat_packet(ct, ctinfo, hooknum, skb);
577 push:
578         skb_push(skb, nh_off);
579 
580         return err;
581 }
582 
583 static void ovs_nat_update_key(struct sw_flow_key *key,
584                                const struct sk_buff *skb,
585                                enum nf_nat_manip_type maniptype)
586 {
587         if (maniptype == NF_NAT_MANIP_SRC) {
588                 __be16 src;
589 
590                 key->ct.state |= OVS_CS_F_SRC_NAT;
591                 if (key->eth.type == htons(ETH_P_IP))
592                         key->ipv4.addr.src = ip_hdr(skb)->saddr;
593                 else if (key->eth.type == htons(ETH_P_IPV6))
594                         memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
595                                sizeof(key->ipv6.addr.src));
596                 else
597                         return;
598 
599                 if (key->ip.proto == IPPROTO_UDP)
600                         src = udp_hdr(skb)->source;
601                 else if (key->ip.proto == IPPROTO_TCP)
602                         src = tcp_hdr(skb)->source;
603                 else if (key->ip.proto == IPPROTO_SCTP)
604                         src = sctp_hdr(skb)->source;
605                 else
606                         return;
607 
608                 key->tp.src = src;
609         } else {
610                 __be16 dst;
611 
612                 key->ct.state |= OVS_CS_F_DST_NAT;
613                 if (key->eth.type == htons(ETH_P_IP))
614                         key->ipv4.addr.dst = ip_hdr(skb)->daddr;
615                 else if (key->eth.type == htons(ETH_P_IPV6))
616                         memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
617                                sizeof(key->ipv6.addr.dst));
618                 else
619                         return;
620 
621                 if (key->ip.proto == IPPROTO_UDP)
622                         dst = udp_hdr(skb)->dest;
623                 else if (key->ip.proto == IPPROTO_TCP)
624                         dst = tcp_hdr(skb)->dest;
625                 else if (key->ip.proto == IPPROTO_SCTP)
626                         dst = sctp_hdr(skb)->dest;
627                 else
628                         return;
629 
630                 key->tp.dst = dst;
631         }
632 }
633 
634 /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
635 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
636                       const struct ovs_conntrack_info *info,
637                       struct sk_buff *skb, struct nf_conn *ct,
638                       enum ip_conntrack_info ctinfo)
639 {
640         enum nf_nat_manip_type maniptype;
641         int err;
642 
643         if (nf_ct_is_untracked(ct)) {
644                 /* A NAT action may only be performed on tracked packets. */
645                 return NF_ACCEPT;
646         }
647 
648         /* Add NAT extension if not confirmed yet. */
649         if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
650                 return NF_ACCEPT;   /* Can't NAT. */
651 
652         /* Determine NAT type.
653          * Check if the NAT type can be deduced from the tracked connection.
654          * Make sure new expected connections (IP_CT_RELATED) are NATted only
655          * when committing.
656          */
657         if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
658             ct->status & IPS_NAT_MASK &&
659             (ctinfo != IP_CT_RELATED || info->commit)) {
660                 /* NAT an established or related connection like before. */
661                 if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
662                         /* This is the REPLY direction for a connection
663                          * for which NAT was applied in the forward
664                          * direction.  Do the reverse NAT.
665                          */
666                         maniptype = ct->status & IPS_SRC_NAT
667                                 ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
668                 else
669                         maniptype = ct->status & IPS_SRC_NAT
670                                 ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
671         } else if (info->nat & OVS_CT_SRC_NAT) {
672                 maniptype = NF_NAT_MANIP_SRC;
673         } else if (info->nat & OVS_CT_DST_NAT) {
674                 maniptype = NF_NAT_MANIP_DST;
675         } else {
676                 return NF_ACCEPT; /* Connection is not NATed. */
677         }
678         err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
679 
680         /* Mark NAT done if successful and update the flow key. */
681         if (err == NF_ACCEPT)
682                 ovs_nat_update_key(key, skb, maniptype);
683 
684         return err;
685 }
686 #else /* !CONFIG_NF_NAT_NEEDED */
687 static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
688                       const struct ovs_conntrack_info *info,
689                       struct sk_buff *skb, struct nf_conn *ct,
690                       enum ip_conntrack_info ctinfo)
691 {
692         return NF_ACCEPT;
693 }
694 #endif
695 
696 /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
697  * not done already.  Update key with new CT state after passing the packet
698  * through conntrack.
699  * Note that if the packet is deemed invalid by conntrack, skb->nfct will be
700  * set to NULL and 0 will be returned.
701  */
702 static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
703                            const struct ovs_conntrack_info *info,
704                            struct sk_buff *skb)
705 {
706         /* If we are recirculating packets to match on conntrack fields and
707          * committing with a separate conntrack action,  then we don't need to
708          * actually run the packet through conntrack twice unless it's for a
709          * different zone.
710          */
711         bool cached = skb_nfct_cached(net, key, info, skb);
712         enum ip_conntrack_info ctinfo;
713         struct nf_conn *ct;
714 
715         if (!cached) {
716                 struct nf_conn *tmpl = info->ct;
717                 int err;
718 
719                 /* Associate skb with specified zone. */
720                 if (tmpl) {
721                         if (skb->nfct)
722                                 nf_conntrack_put(skb->nfct);
723                         nf_conntrack_get(&tmpl->ct_general);
724                         skb->nfct = &tmpl->ct_general;
725                         skb->nfctinfo = IP_CT_NEW;
726                 }
727 
728                 /* Repeat if requested, see nf_iterate(). */
729                 do {
730                         err = nf_conntrack_in(net, info->family,
731                                               NF_INET_PRE_ROUTING, skb);
732                 } while (err == NF_REPEAT);
733 
734                 if (err != NF_ACCEPT)
735                         return -ENOENT;
736 
737                 /* Clear CT state NAT flags to mark that we have not yet done
738                  * NAT after the nf_conntrack_in() call.  We can actually clear
739                  * the whole state, as it will be re-initialized below.
740                  */
741                 key->ct.state = 0;
742 
743                 /* Update the key, but keep the NAT flags. */
744                 ovs_ct_update_key(skb, info, key, true, true);
745         }
746 
747         ct = nf_ct_get(skb, &ctinfo);
748         if (ct) {
749                 /* Packets starting a new connection must be NATted before the
750                  * helper, so that the helper knows about the NAT.  We enforce
751                  * this by delaying both NAT and helper calls for unconfirmed
752                  * connections until the committing CT action.  For later
753                  * packets NAT and Helper may be called in either order.
754                  *
755                  * NAT will be done only if the CT action has NAT, and only
756                  * once per packet (per zone), as guarded by the NAT bits in
757                  * the key->ct.state.
758                  */
759                 if (info->nat && !(key->ct.state & OVS_CS_F_NAT_MASK) &&
760                     (nf_ct_is_confirmed(ct) || info->commit) &&
761                     ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
762                         return -EINVAL;
763                 }
764 
765                 /* Userspace may decide to perform a ct lookup without a helper
766                  * specified followed by a (recirculate and) commit with one.
767                  * Therefore, for unconfirmed connections which we will commit,
768                  * we need to attach the helper here.
769                  */
770                 if (!nf_ct_is_confirmed(ct) && info->commit &&
771                     info->helper && !nfct_help(ct)) {
772                         int err = __nf_ct_try_assign_helper(ct, info->ct,
773                                                             GFP_ATOMIC);
774                         if (err)
775                                 return err;
776                 }
777 
778                 /* Call the helper only if:
779                  * - nf_conntrack_in() was executed above ("!cached") for a
780                  *   confirmed connection, or
781                  * - When committing an unconfirmed connection.
782                  */
783                 if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
784                     ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
785                         return -EINVAL;
786                 }
787         }
788 
789         return 0;
790 }
791 
792 /* Lookup connection and read fields into key. */
793 static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
794                          const struct ovs_conntrack_info *info,
795                          struct sk_buff *skb)
796 {
797         struct nf_conntrack_expect *exp;
798 
799         /* If we pass an expected packet through nf_conntrack_in() the
800          * expectation is typically removed, but the packet could still be
801          * lost in upcall processing.  To prevent this from happening we
802          * perform an explicit expectation lookup.  Expected connections are
803          * always new, and will be passed through conntrack only when they are
804          * committed, as it is OK to remove the expectation at that time.
805          */
806         exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
807         if (exp) {
808                 u8 state;
809 
810                 /* NOTE: New connections are NATted and Helped only when
811                  * committed, so we are not calling into NAT here.
812                  */
813                 state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
814                 __ovs_ct_update_key(key, state, &info->zone, exp->master);
815         } else {
816                 struct nf_conn *ct;
817                 int err;
818 
819                 err = __ovs_ct_lookup(net, key, info, skb);
820                 if (err)
821                         return err;
822 
823                 ct = (struct nf_conn *)skb->nfct;
824                 if (ct)
825                         nf_ct_deliver_cached_events(ct);
826         }
827 
828         return 0;
829 }
830 
831 static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
832 {
833         size_t i;
834 
835         for (i = 0; i < sizeof(*labels); i++)
836                 if (labels->ct_labels[i])
837                         return true;
838 
839         return false;
840 }
841 
842 /* Lookup connection and confirm if unconfirmed. */
843 static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
844                          const struct ovs_conntrack_info *info,
845                          struct sk_buff *skb)
846 {
847         int err;
848 
849         err = __ovs_ct_lookup(net, key, info, skb);
850         if (err)
851                 return err;
852 
853         /* Apply changes before confirming the connection so that the initial
854          * conntrack NEW netlink event carries the values given in the CT
855          * action.
856          */
857         if (info->mark.mask) {
858                 err = ovs_ct_set_mark(skb, key, info->mark.value,
859                                       info->mark.mask);
860                 if (err)
861                         return err;
862         }
863         if (labels_nonzero(&info->labels.mask)) {
864                 err = ovs_ct_set_labels(skb, key, &info->labels.value,
865                                         &info->labels.mask);
866                 if (err)
867                         return err;
868         }
869         /* This will take care of sending queued events even if the connection
870          * is already confirmed.
871          */
872         if (nf_conntrack_confirm(skb) != NF_ACCEPT)
873                 return -EINVAL;
874 
875         return 0;
876 }
877 
878 /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
879  * value if 'skb' is freed.
880  */
881 int ovs_ct_execute(struct net *net, struct sk_buff *skb,
882                    struct sw_flow_key *key,
883                    const struct ovs_conntrack_info *info)
884 {
885         int nh_ofs;
886         int err;
887 
888         /* The conntrack module expects to be working at L3. */
889         nh_ofs = skb_network_offset(skb);
890         skb_pull(skb, nh_ofs);
891 
892         if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
893                 err = handle_fragments(net, key, info->zone.id, skb);
894                 if (err)
895                         return err;
896         }
897 
898         if (info->commit)
899                 err = ovs_ct_commit(net, key, info, skb);
900         else
901                 err = ovs_ct_lookup(net, key, info, skb);
902 
903         skb_push(skb, nh_ofs);
904         if (err)
905                 kfree_skb(skb);
906         return err;
907 }
908 
909 static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
910                              const struct sw_flow_key *key, bool log)
911 {
912         struct nf_conntrack_helper *helper;
913         struct nf_conn_help *help;
914 
915         helper = nf_conntrack_helper_try_module_get(name, info->family,
916                                                     key->ip.proto);
917         if (!helper) {
918                 OVS_NLERR(log, "Unknown helper \"%s\"", name);
919                 return -EINVAL;
920         }
921 
922         help = nf_ct_helper_ext_add(info->ct, helper, GFP_KERNEL);
923         if (!help) {
924                 module_put(helper->me);
925                 return -ENOMEM;
926         }
927 
928         rcu_assign_pointer(help->helper, helper);
929         info->helper = helper;
930         return 0;
931 }
932 
933 #ifdef CONFIG_NF_NAT_NEEDED
934 static int parse_nat(const struct nlattr *attr,
935                      struct ovs_conntrack_info *info, bool log)
936 {
937         struct nlattr *a;
938         int rem;
939         bool have_ip_max = false;
940         bool have_proto_max = false;
941         bool ip_vers = (info->family == NFPROTO_IPV6);
942 
943         nla_for_each_nested(a, attr, rem) {
944                 static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
945                         [OVS_NAT_ATTR_SRC] = {0, 0},
946                         [OVS_NAT_ATTR_DST] = {0, 0},
947                         [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
948                                                  sizeof(struct in6_addr)},
949                         [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
950                                                  sizeof(struct in6_addr)},
951                         [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
952                         [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
953                         [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
954                         [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
955                         [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
956                 };
957                 int type = nla_type(a);
958 
959                 if (type > OVS_NAT_ATTR_MAX) {
960                         OVS_NLERR(log,
961                                   "Unknown NAT attribute (type=%d, max=%d).\n",
962                                   type, OVS_NAT_ATTR_MAX);
963                         return -EINVAL;
964                 }
965 
966                 if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
967                         OVS_NLERR(log,
968                                   "NAT attribute type %d has unexpected length (%d != %d).\n",
969                                   type, nla_len(a),
970                                   ovs_nat_attr_lens[type][ip_vers]);
971                         return -EINVAL;
972                 }
973 
974                 switch (type) {
975                 case OVS_NAT_ATTR_SRC:
976                 case OVS_NAT_ATTR_DST:
977                         if (info->nat) {
978                                 OVS_NLERR(log,
979                                           "Only one type of NAT may be specified.\n"
980                                           );
981                                 return -ERANGE;
982                         }
983                         info->nat |= OVS_CT_NAT;
984                         info->nat |= ((type == OVS_NAT_ATTR_SRC)
985                                         ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
986                         break;
987 
988                 case OVS_NAT_ATTR_IP_MIN:
989                         nla_memcpy(&info->range.min_addr, a,
990                                    sizeof(info->range.min_addr));
991                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
992                         break;
993 
994                 case OVS_NAT_ATTR_IP_MAX:
995                         have_ip_max = true;
996                         nla_memcpy(&info->range.max_addr, a,
997                                    sizeof(info->range.max_addr));
998                         info->range.flags |= NF_NAT_RANGE_MAP_IPS;
999                         break;
1000 
1001                 case OVS_NAT_ATTR_PROTO_MIN:
1002                         info->range.min_proto.all = htons(nla_get_u16(a));
1003                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1004                         break;
1005 
1006                 case OVS_NAT_ATTR_PROTO_MAX:
1007                         have_proto_max = true;
1008                         info->range.max_proto.all = htons(nla_get_u16(a));
1009                         info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
1010                         break;
1011 
1012                 case OVS_NAT_ATTR_PERSISTENT:
1013                         info->range.flags |= NF_NAT_RANGE_PERSISTENT;
1014                         break;
1015 
1016                 case OVS_NAT_ATTR_PROTO_HASH:
1017                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
1018                         break;
1019 
1020                 case OVS_NAT_ATTR_PROTO_RANDOM:
1021                         info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
1022                         break;
1023 
1024                 default:
1025                         OVS_NLERR(log, "Unknown nat attribute (%d).\n", type);
1026                         return -EINVAL;
1027                 }
1028         }
1029 
1030         if (rem > 0) {
1031                 OVS_NLERR(log, "NAT attribute has %d unknown bytes.\n", rem);
1032                 return -EINVAL;
1033         }
1034         if (!info->nat) {
1035                 /* Do not allow flags if no type is given. */
1036                 if (info->range.flags) {
1037                         OVS_NLERR(log,
1038                                   "NAT flags may be given only when NAT range (SRC or DST) is also specified.\n"
1039                                   );
1040                         return -EINVAL;
1041                 }
1042                 info->nat = OVS_CT_NAT;   /* NAT existing connections. */
1043         } else if (!info->commit) {
1044                 OVS_NLERR(log,
1045                           "NAT attributes may be specified only when CT COMMIT flag is also specified.\n"
1046                           );
1047                 return -EINVAL;
1048         }
1049         /* Allow missing IP_MAX. */
1050         if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
1051                 memcpy(&info->range.max_addr, &info->range.min_addr,
1052                        sizeof(info->range.max_addr));
1053         }
1054         /* Allow missing PROTO_MAX. */
1055         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1056             !have_proto_max) {
1057                 info->range.max_proto.all = info->range.min_proto.all;
1058         }
1059         return 0;
1060 }
1061 #endif
1062 
1063 static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
1064         [OVS_CT_ATTR_COMMIT]    = { .minlen = 0, .maxlen = 0 },
1065         [OVS_CT_ATTR_ZONE]      = { .minlen = sizeof(u16),
1066                                     .maxlen = sizeof(u16) },
1067         [OVS_CT_ATTR_MARK]      = { .minlen = sizeof(struct md_mark),
1068                                     .maxlen = sizeof(struct md_mark) },
1069         [OVS_CT_ATTR_LABELS]    = { .minlen = sizeof(struct md_labels),
1070                                     .maxlen = sizeof(struct md_labels) },
1071         [OVS_CT_ATTR_HELPER]    = { .minlen = 1,
1072                                     .maxlen = NF_CT_HELPER_NAME_LEN },
1073 #ifdef CONFIG_NF_NAT_NEEDED
1074         /* NAT length is checked when parsing the nested attributes. */
1075         [OVS_CT_ATTR_NAT]       = { .minlen = 0, .maxlen = INT_MAX },
1076 #endif
1077 };
1078 
1079 static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
1080                     const char **helper, bool log)
1081 {
1082         struct nlattr *a;
1083         int rem;
1084 
1085         nla_for_each_nested(a, attr, rem) {
1086                 int type = nla_type(a);
1087                 int maxlen = ovs_ct_attr_lens[type].maxlen;
1088                 int minlen = ovs_ct_attr_lens[type].minlen;
1089 
1090                 if (type > OVS_CT_ATTR_MAX) {
1091                         OVS_NLERR(log,
1092                                   "Unknown conntrack attr (type=%d, max=%d)",
1093                                   type, OVS_CT_ATTR_MAX);
1094                         return -EINVAL;
1095                 }
1096                 if (nla_len(a) < minlen || nla_len(a) > maxlen) {
1097                         OVS_NLERR(log,
1098                                   "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
1099                                   type, nla_len(a), maxlen);
1100                         return -EINVAL;
1101                 }
1102 
1103                 switch (type) {
1104                 case OVS_CT_ATTR_COMMIT:
1105                         info->commit = true;
1106                         break;
1107 #ifdef CONFIG_NF_CONNTRACK_ZONES
1108                 case OVS_CT_ATTR_ZONE:
1109                         info->zone.id = nla_get_u16(a);
1110                         break;
1111 #endif
1112 #ifdef CONFIG_NF_CONNTRACK_MARK
1113                 case OVS_CT_ATTR_MARK: {
1114                         struct md_mark *mark = nla_data(a);
1115 
1116                         if (!mark->mask) {
1117                                 OVS_NLERR(log, "ct_mark mask cannot be 0");
1118                                 return -EINVAL;
1119                         }
1120                         info->mark = *mark;
1121                         break;
1122                 }
1123 #endif
1124 #ifdef CONFIG_NF_CONNTRACK_LABELS
1125                 case OVS_CT_ATTR_LABELS: {
1126                         struct md_labels *labels = nla_data(a);
1127 
1128                         if (!labels_nonzero(&labels->mask)) {
1129                                 OVS_NLERR(log, "ct_labels mask cannot be 0");
1130                                 return -EINVAL;
1131                         }
1132                         info->labels = *labels;
1133                         break;
1134                 }
1135 #endif
1136                 case OVS_CT_ATTR_HELPER:
1137                         *helper = nla_data(a);
1138                         if (!memchr(*helper, '\0', nla_len(a))) {
1139                                 OVS_NLERR(log, "Invalid conntrack helper");
1140                                 return -EINVAL;
1141                         }
1142                         break;
1143 #ifdef CONFIG_NF_NAT_NEEDED
1144                 case OVS_CT_ATTR_NAT: {
1145                         int err = parse_nat(a, info, log);
1146 
1147                         if (err)
1148                                 return err;
1149                         break;
1150                 }
1151 #endif
1152                 default:
1153                         OVS_NLERR(log, "Unknown conntrack attr (%d)",
1154                                   type);
1155                         return -EINVAL;
1156                 }
1157         }
1158 
1159 #ifdef CONFIG_NF_CONNTRACK_MARK
1160         if (!info->commit && info->mark.mask) {
1161                 OVS_NLERR(log,
1162                           "Setting conntrack mark requires 'commit' flag.");
1163                 return -EINVAL;
1164         }
1165 #endif
1166 #ifdef CONFIG_NF_CONNTRACK_LABELS
1167         if (!info->commit && labels_nonzero(&info->labels.mask)) {
1168                 OVS_NLERR(log,
1169                           "Setting conntrack labels requires 'commit' flag.");
1170                 return -EINVAL;
1171         }
1172 #endif
1173         if (rem > 0) {
1174                 OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
1175                 return -EINVAL;
1176         }
1177 
1178         return 0;
1179 }
1180 
1181 bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
1182 {
1183         if (attr == OVS_KEY_ATTR_CT_STATE)
1184                 return true;
1185         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1186             attr == OVS_KEY_ATTR_CT_ZONE)
1187                 return true;
1188         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
1189             attr == OVS_KEY_ATTR_CT_MARK)
1190                 return true;
1191         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1192             attr == OVS_KEY_ATTR_CT_LABELS) {
1193                 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1194 
1195                 return ovs_net->xt_label;
1196         }
1197 
1198         return false;
1199 }
1200 
1201 int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
1202                        const struct sw_flow_key *key,
1203                        struct sw_flow_actions **sfa,  bool log)
1204 {
1205         struct ovs_conntrack_info ct_info;
1206         const char *helper = NULL;
1207         u16 family;
1208         int err;
1209 
1210         family = key_to_nfproto(key);
1211         if (family == NFPROTO_UNSPEC) {
1212                 OVS_NLERR(log, "ct family unspecified");
1213                 return -EINVAL;
1214         }
1215 
1216         memset(&ct_info, 0, sizeof(ct_info));
1217         ct_info.family = family;
1218 
1219         nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
1220                         NF_CT_DEFAULT_ZONE_DIR, 0);
1221 
1222         err = parse_ct(attr, &ct_info, &helper, log);
1223         if (err)
1224                 return err;
1225 
1226         /* Set up template for tracking connections in specific zones. */
1227         ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
1228         if (!ct_info.ct) {
1229                 OVS_NLERR(log, "Failed to allocate conntrack template");
1230                 return -ENOMEM;
1231         }
1232 
1233         __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
1234         nf_conntrack_get(&ct_info.ct->ct_general);
1235 
1236         if (helper) {
1237                 err = ovs_ct_add_helper(&ct_info, helper, key, log);
1238                 if (err)
1239                         goto err_free_ct;
1240         }
1241 
1242         err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
1243                                  sizeof(ct_info), log);
1244         if (err)
1245                 goto err_free_ct;
1246 
1247         return 0;
1248 err_free_ct:
1249         __ovs_ct_free_action(&ct_info);
1250         return err;
1251 }
1252 
1253 #ifdef CONFIG_NF_NAT_NEEDED
1254 static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
1255                                struct sk_buff *skb)
1256 {
1257         struct nlattr *start;
1258 
1259         start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
1260         if (!start)
1261                 return false;
1262 
1263         if (info->nat & OVS_CT_SRC_NAT) {
1264                 if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
1265                         return false;
1266         } else if (info->nat & OVS_CT_DST_NAT) {
1267                 if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
1268                         return false;
1269         } else {
1270                 goto out;
1271         }
1272 
1273         if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
1274                 if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
1275                     info->family == NFPROTO_IPV4) {
1276                         if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
1277                                             info->range.min_addr.ip) ||
1278                             (info->range.max_addr.ip
1279                              != info->range.min_addr.ip &&
1280                              (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
1281                                               info->range.max_addr.ip))))
1282                                 return false;
1283                 } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
1284                            info->family == NFPROTO_IPV6) {
1285                         if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
1286                                              &info->range.min_addr.in6) ||
1287                             (memcmp(&info->range.max_addr.in6,
1288                                     &info->range.min_addr.in6,
1289                                     sizeof(info->range.max_addr.in6)) &&
1290                              (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
1291                                                &info->range.max_addr.in6))))
1292                                 return false;
1293                 } else {
1294                         return false;
1295                 }
1296         }
1297         if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
1298             (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
1299                          ntohs(info->range.min_proto.all)) ||
1300              (info->range.max_proto.all != info->range.min_proto.all &&
1301               nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
1302                           ntohs(info->range.max_proto.all)))))
1303                 return false;
1304 
1305         if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
1306             nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
1307                 return false;
1308         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
1309             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
1310                 return false;
1311         if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
1312             nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
1313                 return false;
1314 out:
1315         nla_nest_end(skb, start);
1316 
1317         return true;
1318 }
1319 #endif
1320 
1321 int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
1322                           struct sk_buff *skb)
1323 {
1324         struct nlattr *start;
1325 
1326         start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
1327         if (!start)
1328                 return -EMSGSIZE;
1329 
1330         if (ct_info->commit && nla_put_flag(skb, OVS_CT_ATTR_COMMIT))
1331                 return -EMSGSIZE;
1332         if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
1333             nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
1334                 return -EMSGSIZE;
1335         if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
1336             nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
1337                     &ct_info->mark))
1338                 return -EMSGSIZE;
1339         if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
1340             labels_nonzero(&ct_info->labels.mask) &&
1341             nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
1342                     &ct_info->labels))
1343                 return -EMSGSIZE;
1344         if (ct_info->helper) {
1345                 if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
1346                                    ct_info->helper->name))
1347                         return -EMSGSIZE;
1348         }
1349 #ifdef CONFIG_NF_NAT_NEEDED
1350         if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
1351                 return -EMSGSIZE;
1352 #endif
1353         nla_nest_end(skb, start);
1354 
1355         return 0;
1356 }
1357 
1358 void ovs_ct_free_action(const struct nlattr *a)
1359 {
1360         struct ovs_conntrack_info *ct_info = nla_data(a);
1361 
1362         __ovs_ct_free_action(ct_info);
1363 }
1364 
1365 static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
1366 {
1367         if (ct_info->helper)
1368                 module_put(ct_info->helper->me);
1369         if (ct_info->ct)
1370                 nf_ct_put(ct_info->ct);
1371 }
1372 
1373 void ovs_ct_init(struct net *net)
1374 {
1375         unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
1376         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1377 
1378         if (nf_connlabels_get(net, n_bits - 1)) {
1379                 ovs_net->xt_label = false;
1380                 OVS_NLERR(true, "Failed to set connlabel length");
1381         } else {
1382                 ovs_net->xt_label = true;
1383         }
1384 }
1385 
1386 void ovs_ct_exit(struct net *net)
1387 {
1388         struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
1389 
1390         if (ovs_net->xt_label)
1391                 nf_connlabels_put(net);
1392 }
1393 

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