2 * Copyright (c) 2007-2012 Nicira, Inc.
3 * Distributed under the terms of the GNU GPL version 2.
5 * Significant portions of this file may be copied from parts of the Linux
6 * kernel, by Linus Torvalds and others.
9 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
11 #include <linux/version.h>
12 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,26)
17 #include <linux/list.h>
18 #include <linux/net.h>
19 #include <net/net_namespace.h>
22 #include <net/inet_frag.h>
24 #include <net/protocol.h>
31 #define CAPWAP_SRC_PORT 58881
32 #define CAPWAP_DST_PORT 58882
34 #define CAPWAP_FRAG_TIMEOUT (30 * HZ)
35 #define CAPWAP_FRAG_MAX_MEM (256 * 1024)
36 #define CAPWAP_FRAG_PRUNE_MEM (192 * 1024)
37 #define CAPWAP_FRAG_SECRET_INTERVAL (10 * 60 * HZ)
40 * The CAPWAP header is a mess, with all kinds of odd size bit fields that
41 * cross byte boundaries, which are difficult to represent correctly in
42 * various byte orderings. Luckily we only care about a few permutations, so
43 * statically create them and we can do very fast parsing by checking all 12
46 #define CAPWAP_PREAMBLE_MASK __cpu_to_be32(0xFF000000)
47 #define CAPWAP_HLEN_SHIFT 17
48 #define CAPWAP_HLEN_MASK __cpu_to_be32(0x00F80000)
49 #define CAPWAP_RID_MASK __cpu_to_be32(0x0007C000)
50 #define CAPWAP_WBID_MASK __cpu_to_be32(0x00003E00)
51 #define CAPWAP_F_MASK __cpu_to_be32(0x000001FF)
53 #define CAPWAP_F_FRAG __cpu_to_be32(0x00000080)
54 #define CAPWAP_F_LASTFRAG __cpu_to_be32(0x00000040)
55 #define CAPWAP_F_WSI __cpu_to_be32(0x00000020)
56 #define CAPWAP_F_RMAC __cpu_to_be32(0x00000010)
58 #define CAPWAP_RMAC_LEN 4
60 /* Standard CAPWAP looks for a WBID value of 2.
61 * When we insert WSI field, use WBID value of 30, which has been
62 * proposed for all "experimental" usage - users with no reserved WBID value
65 #define CAPWAP_WBID_30 __cpu_to_be32(0x00003C00)
66 #define CAPWAP_WBID_2 __cpu_to_be32(0x00000200)
68 #define FRAG_HDR (CAPWAP_F_FRAG)
69 #define FRAG_LAST_HDR (FRAG_HDR | CAPWAP_F_LASTFRAG)
71 /* Keyed packet, WBID 30, and length long enough to include WSI key */
72 #define CAPWAP_KEYED (CAPWAP_WBID_30 | CAPWAP_F_WSI | htonl(20 << CAPWAP_HLEN_SHIFT))
73 /* A backward-compatible packet, WBID 2 and length of 2 words (no WSI fields) */
74 #define CAPWAP_NO_WSI (CAPWAP_WBID_2 | htonl(8 << CAPWAP_HLEN_SHIFT))
76 /* Mask for all parts of header that must be 0. */
77 #define CAPWAP_ZERO_MASK (CAPWAP_PREAMBLE_MASK | \
78 (CAPWAP_F_MASK ^ (CAPWAP_F_WSI | CAPWAP_F_FRAG | CAPWAP_F_LASTFRAG | CAPWAP_F_RMAC)))
83 /* low 3 bits of frag_off are reserved */
88 * We use the WSI field to hold additional tunnel data.
89 * The first eight bits store the size of the wsi data in bytes.
91 struct capwaphdr_wsi {
94 __be16 reserved_padding;
97 struct capwaphdr_wsi_key {
101 /* Flag indicating a 64bit key is stored in WSI data field */
102 #define CAPWAP_WSI_F_KEY64 0x80
104 static struct capwaphdr *capwap_hdr(const struct sk_buff *skb)
106 return (struct capwaphdr *)(udp_hdr(skb) + 1);
110 * The fragment offset is actually the high 13 bits of the last 16 bit field,
111 * so we would normally need to right shift 3 places. However, it stores the
112 * offset in 8 byte chunks, which would involve a 3 place left shift. So we
113 * just mask off the last 3 bits and be done with it.
115 #define FRAG_OFF_MASK (~0x7U)
118 * The minimum header length. The header may be longer if the optional
121 #define CAPWAP_MIN_HLEN (sizeof(struct udphdr) + sizeof(struct capwaphdr))
130 struct inet_frag_queue ifq;
131 struct frag_match match;
137 #define FRAG_CB(skb) ((struct frag_skb_cb *)(skb)->cb)
139 static struct sk_buff *fragment(struct sk_buff *, const struct vport *,
140 struct dst_entry *dst, unsigned int hlen);
141 static struct sk_buff *defrag(struct sk_buff *, bool frag_last);
143 static void capwap_frag_init(struct inet_frag_queue *, void *match);
144 static unsigned int capwap_frag_hash(struct inet_frag_queue *);
145 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
146 static int capwap_frag_match(struct inet_frag_queue *, void *match);
148 static bool capwap_frag_match(struct inet_frag_queue *, void *match);
150 static void capwap_frag_expire(unsigned long ifq);
152 static struct inet_frags frag_state = {
153 .constructor = capwap_frag_init,
154 .qsize = sizeof(struct frag_queue),
155 .hashfn = capwap_frag_hash,
156 .match = capwap_frag_match,
157 .frag_expire = capwap_frag_expire,
158 .secret_interval = CAPWAP_FRAG_SECRET_INTERVAL,
161 static int capwap_hdr_len(const struct tnl_mutable_config *mutable,
162 const struct ovs_key_ipv4_tunnel *tun_key)
164 int size = CAPWAP_MIN_HLEN;
168 tnl_get_param(mutable, tun_key, &flags, &out_key);
170 /* CAPWAP has no checksums. */
171 if (flags & TNL_F_CSUM)
174 /* if keys are specified, then add WSI field */
175 if (out_key || (flags & TNL_F_OUT_KEY_ACTION)) {
176 size += sizeof(struct capwaphdr_wsi) +
177 sizeof(struct capwaphdr_wsi_key);
183 static struct sk_buff *capwap_build_header(const struct vport *vport,
184 const struct tnl_mutable_config *mutable,
185 struct dst_entry *dst,
189 struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
190 struct udphdr *udph = udp_hdr(skb);
191 struct capwaphdr *cwh = (struct capwaphdr *)(udph + 1);
195 tnl_get_param(mutable, tun_key, &flags, &out_key);
197 udph->source = htons(CAPWAP_SRC_PORT);
198 udph->dest = htons(CAPWAP_DST_PORT);
204 if (out_key || flags & TNL_F_OUT_KEY_ACTION) {
205 /* first field in WSI is key */
206 struct capwaphdr_wsi *wsi = (struct capwaphdr_wsi *)(cwh + 1);
208 cwh->begin = CAPWAP_KEYED;
210 /* -1 for wsi_len byte, not included in length as per spec */
211 wsi->wsi_len = sizeof(struct capwaphdr_wsi) - 1
212 + sizeof(struct capwaphdr_wsi_key);
213 wsi->flags = CAPWAP_WSI_F_KEY64;
214 wsi->reserved_padding = 0;
217 struct capwaphdr_wsi_key *opt = (struct capwaphdr_wsi_key *)(wsi + 1);
221 /* make packet readable by old capwap code */
222 cwh->begin = CAPWAP_NO_WSI;
224 udph->len = htons(skb->len - skb_transport_offset(skb));
226 if (unlikely(skb->len - skb_network_offset(skb) > dst_mtu(dst))) {
227 unsigned int hlen = skb_transport_offset(skb) + capwap_hdr_len(mutable, tun_key);
228 skb = fragment(skb, vport, dst, hlen);
234 static int process_capwap_wsi(struct sk_buff *skb, __be64 *key, bool *key_present)
236 struct capwaphdr *cwh = capwap_hdr(skb);
237 struct capwaphdr_wsi *wsi;
242 if (((cwh->begin & CAPWAP_WBID_MASK) != CAPWAP_WBID_30))
245 if (cwh->begin & CAPWAP_F_RMAC)
246 rmac_len = CAPWAP_RMAC_LEN;
248 hdr_len = ntohl(cwh->begin & CAPWAP_HLEN_MASK) >> CAPWAP_HLEN_SHIFT;
250 if (unlikely(sizeof(struct capwaphdr) + rmac_len + sizeof(struct capwaphdr_wsi) > hdr_len))
253 /* read wsi header to find out how big it really is */
254 wsi = (struct capwaphdr_wsi *)((u8 *)(cwh + 1) + rmac_len);
255 /* +1 for length byte not included in wsi_len */
256 wsi_len = 1 + wsi->wsi_len;
258 if (unlikely(sizeof(struct capwaphdr) + rmac_len + wsi_len != hdr_len))
261 wsi_len -= sizeof(struct capwaphdr_wsi);
263 if (wsi->flags & CAPWAP_WSI_F_KEY64) {
264 struct capwaphdr_wsi_key *opt;
266 if (unlikely(wsi_len < sizeof(struct capwaphdr_wsi_key)))
269 opt = (struct capwaphdr_wsi_key *)(wsi + 1);
273 *key_present = false;
279 static struct sk_buff *process_capwap_proto(struct sk_buff *skb, __be64 *key, bool *key_present)
281 struct capwaphdr *cwh = capwap_hdr(skb);
282 int hdr_len = sizeof(struct udphdr);
284 if (unlikely((cwh->begin & CAPWAP_ZERO_MASK) != 0))
287 hdr_len += ntohl(cwh->begin & CAPWAP_HLEN_MASK) >> CAPWAP_HLEN_SHIFT;
288 if (unlikely(hdr_len < CAPWAP_MIN_HLEN))
291 if (unlikely(!pskb_may_pull(skb, hdr_len + ETH_HLEN)))
294 cwh = capwap_hdr(skb);
295 __skb_pull(skb, hdr_len);
296 skb_postpull_rcsum(skb, skb_transport_header(skb), hdr_len + ETH_HLEN);
298 if (cwh->begin & CAPWAP_F_FRAG) {
299 skb = defrag(skb, (__force bool)(cwh->begin & CAPWAP_F_LASTFRAG));
302 cwh = capwap_hdr(skb);
305 if ((cwh->begin & CAPWAP_F_WSI) && process_capwap_wsi(skb, key, key_present))
314 /* Called with rcu_read_lock and BH disabled. */
315 static int capwap_rcv(struct sock *sk, struct sk_buff *skb)
318 const struct tnl_mutable_config *mutable;
320 struct ovs_key_ipv4_tunnel tun_key;
322 bool key_present = false;
324 if (unlikely(!pskb_may_pull(skb, CAPWAP_MIN_HLEN + ETH_HLEN)))
327 skb = process_capwap_proto(skb, &key, &key_present);
332 vport = ovs_tnl_find_port(sock_net(sk), iph->daddr, iph->saddr, key,
333 TNL_T_PROTO_CAPWAP, &mutable);
334 if (unlikely(!vport))
337 if (key_present && mutable->key.daddr &&
338 !(mutable->flags & TNL_F_IN_KEY_MATCH)) {
343 tnl_tun_key_init(&tun_key, iph, key, key_present ? OVS_TNL_F_KEY : 0);
344 OVS_CB(skb)->tun_key = &tun_key;
346 ovs_tnl_rcv(vport, skb);
355 static const struct tnl_ops capwap_tnl_ops = {
356 .tunnel_type = TNL_T_PROTO_CAPWAP,
357 .ipproto = IPPROTO_UDP,
358 .hdr_len = capwap_hdr_len,
359 .build_header = capwap_build_header,
362 static inline struct capwap_net *ovs_get_capwap_net(struct net *net)
364 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
365 return &ovs_net->vport_net.capwap;
368 /* Arbitrary value. Irrelevant as long as it's not 0 since we set the handler. */
369 #define UDP_ENCAP_CAPWAP 10
370 static int init_socket(struct net *net)
373 struct capwap_net *capwap_net = ovs_get_capwap_net(net);
374 struct sockaddr_in sin;
376 if (capwap_net->n_tunnels) {
377 capwap_net->n_tunnels++;
381 err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
382 &capwap_net->capwap_rcv_socket);
386 /* release net ref. */
387 sk_change_net(capwap_net->capwap_rcv_socket->sk, net);
389 sin.sin_family = AF_INET;
390 sin.sin_addr.s_addr = htonl(INADDR_ANY);
391 sin.sin_port = htons(CAPWAP_DST_PORT);
393 err = kernel_bind(capwap_net->capwap_rcv_socket,
394 (struct sockaddr *)&sin,
395 sizeof(struct sockaddr_in));
399 udp_sk(capwap_net->capwap_rcv_socket->sk)->encap_type = UDP_ENCAP_CAPWAP;
400 udp_sk(capwap_net->capwap_rcv_socket->sk)->encap_rcv = capwap_rcv;
402 capwap_net->frag_state.timeout = CAPWAP_FRAG_TIMEOUT;
403 capwap_net->frag_state.high_thresh = CAPWAP_FRAG_MAX_MEM;
404 capwap_net->frag_state.low_thresh = CAPWAP_FRAG_PRUNE_MEM;
406 inet_frags_init_net(&capwap_net->frag_state);
408 capwap_net->n_tunnels++;
412 sk_release_kernel(capwap_net->capwap_rcv_socket->sk);
414 pr_warn("cannot register capwap protocol handler : %d\n", err);
418 static void release_socket(struct net *net)
420 struct capwap_net *capwap_net = ovs_get_capwap_net(net);
422 capwap_net->n_tunnels--;
423 if (capwap_net->n_tunnels)
426 inet_frags_exit_net(&capwap_net->frag_state, &frag_state);
427 sk_release_kernel(capwap_net->capwap_rcv_socket->sk);
430 static struct vport *capwap_create(const struct vport_parms *parms)
435 err = init_socket(ovs_dp_get_net(parms->dp));
439 vport = ovs_tnl_create(parms, &ovs_capwap_vport_ops, &capwap_tnl_ops);
441 release_socket(ovs_dp_get_net(parms->dp));
446 static void capwap_destroy(struct vport *vport)
448 ovs_tnl_destroy(vport);
449 release_socket(ovs_dp_get_net(vport->dp));
452 static int capwap_init(void)
454 inet_frags_init(&frag_state);
458 static void capwap_exit(void)
460 inet_frags_fini(&frag_state);
463 static void copy_skb_metadata(struct sk_buff *from, struct sk_buff *to)
465 to->pkt_type = from->pkt_type;
466 to->priority = from->priority;
467 to->protocol = from->protocol;
468 skb_dst_set(to, dst_clone(skb_dst(from)));
470 to->mark = from->mark;
473 skb_set_owner_w(to, from->sk);
475 #ifdef CONFIG_NET_SCHED
476 to->tc_index = from->tc_index;
478 #if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
479 to->ipvs_property = from->ipvs_property;
481 skb_copy_secmark(to, from);
484 static struct sk_buff *fragment(struct sk_buff *skb, const struct vport *vport,
485 struct dst_entry *dst, unsigned int hlen)
487 struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
488 unsigned int headroom;
489 unsigned int max_frame_len = dst_mtu(dst) + skb_network_offset(skb);
490 struct sk_buff *result = NULL, *list_cur = NULL;
491 unsigned int remaining;
495 if (hlen + ~FRAG_OFF_MASK + 1 > max_frame_len) {
497 pr_warn("capwap link mtu (%d) is less than minimum packet (%d)\n",
499 hlen - skb_network_offset(skb) + ~FRAG_OFF_MASK + 1);
503 remaining = skb->len - hlen;
505 frag_id = htons(atomic_inc_return(&tnl_vport->frag_id));
507 headroom = dst->header_len + 16;
508 if (!skb_network_offset(skb))
509 headroom += LL_RESERVED_SPACE(dst->dev);
512 struct sk_buff *skb2;
515 struct capwaphdr *cwh;
517 frag_size = min(remaining, max_frame_len - hlen);
518 if (remaining > frag_size)
519 frag_size &= FRAG_OFF_MASK;
521 skb2 = alloc_skb(headroom + hlen + frag_size, GFP_ATOMIC);
525 skb_reserve(skb2, headroom);
526 __skb_put(skb2, hlen + frag_size);
528 if (skb_network_offset(skb))
529 skb_reset_mac_header(skb2);
530 skb_set_network_header(skb2, skb_network_offset(skb));
531 skb_set_transport_header(skb2, skb_transport_offset(skb));
533 /* Copy (Ethernet)/IP/UDP/CAPWAP header. */
534 copy_skb_metadata(skb, skb2);
535 skb_copy_from_linear_data(skb, skb2->data, hlen);
537 /* Copy this data chunk. */
538 if (skb_copy_bits(skb, hlen + offset, skb2->data + hlen, frag_size))
541 udph = udp_hdr(skb2);
542 udph->len = htons(skb2->len - skb_transport_offset(skb2));
544 cwh = capwap_hdr(skb2);
545 if (remaining > frag_size)
546 cwh->begin |= FRAG_HDR;
548 cwh->begin |= FRAG_LAST_HDR;
549 cwh->frag_id = frag_id;
550 cwh->frag_off = htons(offset);
553 list_cur->next = skb2;
556 result = list_cur = skb2;
559 remaining -= frag_size;
566 ovs_tnl_free_linked_skbs(result);
571 /* All of the following functions relate to fragmentation reassembly. */
573 static struct frag_queue *ifq_cast(struct inet_frag_queue *ifq)
575 return container_of(ifq, struct frag_queue, ifq);
578 static u32 frag_hash(struct frag_match *match)
580 return jhash_3words((__force u16)match->id, (__force u32)match->saddr,
581 (__force u32)match->daddr,
582 frag_state.rnd) & (INETFRAGS_HASHSZ - 1);
585 static struct frag_queue *queue_find(struct netns_frags *ns_frag_state,
586 struct frag_match *match)
588 struct inet_frag_queue *ifq;
590 read_lock(&frag_state.lock);
592 ifq = inet_frag_find(ns_frag_state, &frag_state, match, frag_hash(match));
596 /* Unlock happens inside inet_frag_find(). */
598 return ifq_cast(ifq);
601 static struct sk_buff *frag_reasm(struct frag_queue *fq, struct net_device *dev)
603 struct sk_buff *head = fq->ifq.fragments;
604 struct sk_buff *frag;
606 /* Succeed or fail, we're done with this queue. */
607 inet_frag_kill(&fq->ifq, &frag_state);
609 if (fq->ifq.len > 65535)
612 /* Can't have the head be a clone. */
613 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
617 * We're about to build frag list for this SKB. If it already has a
618 * frag list, alloc a new SKB and put the existing frag list there.
620 if (skb_shinfo(head)->frag_list) {
624 frag = alloc_skb(0, GFP_ATOMIC);
628 frag->next = head->next;
630 skb_shinfo(frag)->frag_list = skb_shinfo(head)->frag_list;
631 skb_shinfo(head)->frag_list = NULL;
633 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
634 paged_len += skb_shinfo(head)->frags[i].size;
635 frag->len = frag->data_len = head->data_len - paged_len;
636 head->data_len -= frag->len;
637 head->len -= frag->len;
639 frag->ip_summed = head->ip_summed;
640 atomic_add(frag->truesize, &fq->ifq.net->mem);
643 skb_shinfo(head)->frag_list = head->next;
644 atomic_sub(head->truesize, &fq->ifq.net->mem);
646 /* Properly account for data in various packets. */
647 for (frag = head->next; frag; frag = frag->next) {
648 head->data_len += frag->len;
649 head->len += frag->len;
651 if (head->ip_summed != frag->ip_summed)
652 head->ip_summed = CHECKSUM_NONE;
653 else if (head->ip_summed == CHECKSUM_COMPLETE)
654 head->csum = csum_add(head->csum, frag->csum);
656 head->truesize += frag->truesize;
657 atomic_sub(frag->truesize, &fq->ifq.net->mem);
662 head->tstamp = fq->ifq.stamp;
663 fq->ifq.fragments = NULL;
668 static struct sk_buff *frag_queue(struct frag_queue *fq, struct sk_buff *skb,
669 u16 offset, bool frag_last)
671 struct sk_buff *prev, *next;
672 struct net_device *dev;
675 if (fq->ifq.last_in & INET_FRAG_COMPLETE)
681 end = offset + skb->len;
685 * Last fragment, shouldn't already have data past our end or
686 * have another last fragment.
688 if (end < fq->ifq.len || fq->ifq.last_in & INET_FRAG_LAST_IN)
691 fq->ifq.last_in |= INET_FRAG_LAST_IN;
694 /* Fragments should align to 8 byte chunks. */
695 if (end & ~FRAG_OFF_MASK)
698 if (end > fq->ifq.len) {
700 * Shouldn't have data past the end, if we already
703 if (fq->ifq.last_in & INET_FRAG_LAST_IN)
710 /* Find where we fit in. */
712 for (next = fq->ifq.fragments; next != NULL; next = next->next) {
713 if (FRAG_CB(next)->offset >= offset)
719 * Overlapping fragments aren't allowed. We shouldn't start before
720 * the end of the previous fragment.
722 if (prev && FRAG_CB(prev)->offset + prev->len > offset)
725 /* We also shouldn't end after the beginning of the next fragment. */
726 if (next && end > FRAG_CB(next)->offset)
729 FRAG_CB(skb)->offset = offset;
731 /* Link into list. */
736 fq->ifq.fragments = skb;
741 fq->ifq.stamp = skb->tstamp;
742 fq->ifq.meat += skb->len;
743 atomic_add(skb->truesize, &fq->ifq.net->mem);
745 fq->ifq.last_in |= INET_FRAG_FIRST_IN;
747 /* If we have all fragments do reassembly. */
748 if (fq->ifq.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
749 fq->ifq.meat == fq->ifq.len)
750 return frag_reasm(fq, dev);
752 write_lock(&frag_state.lock);
753 list_move_tail(&fq->ifq.lru_list, &fq->ifq.net->lru_list);
754 write_unlock(&frag_state.lock);
763 static struct sk_buff *defrag(struct sk_buff *skb, bool frag_last)
765 struct iphdr *iph = ip_hdr(skb);
766 struct capwaphdr *cwh = capwap_hdr(skb);
767 struct capwap_net *capwap_net = ovs_get_capwap_net(dev_net(skb->dev));
768 struct netns_frags *ns_frag_state = &capwap_net->frag_state;
769 struct frag_match match;
771 struct frag_queue *fq;
773 inet_frag_evictor(ns_frag_state, &frag_state, false);
775 match.daddr = iph->daddr;
776 match.saddr = iph->saddr;
777 match.id = cwh->frag_id;
778 frag_off = ntohs(cwh->frag_off) & FRAG_OFF_MASK;
780 fq = queue_find(ns_frag_state, &match);
782 spin_lock(&fq->ifq.lock);
783 skb = frag_queue(fq, skb, frag_off, frag_last);
784 spin_unlock(&fq->ifq.lock);
786 inet_frag_put(&fq->ifq, &frag_state);
795 static void capwap_frag_init(struct inet_frag_queue *ifq, void *match_)
797 struct frag_match *match = match_;
799 ifq_cast(ifq)->match = *match;
802 static unsigned int capwap_frag_hash(struct inet_frag_queue *ifq)
804 return frag_hash(&ifq_cast(ifq)->match);
807 #if LINUX_VERSION_CODE < KERNEL_VERSION(3,7,0)
808 static int capwap_frag_match(struct inet_frag_queue *ifq, void *a_)
810 static bool capwap_frag_match(struct inet_frag_queue *ifq, void *a_)
813 struct frag_match *a = a_;
814 struct frag_match *b = &ifq_cast(ifq)->match;
816 return a->id == b->id && a->saddr == b->saddr && a->daddr == b->daddr;
819 /* Run when the timeout for a given queue expires. */
820 static void capwap_frag_expire(unsigned long ifq)
822 struct frag_queue *fq;
824 fq = ifq_cast((struct inet_frag_queue *)ifq);
826 spin_lock(&fq->ifq.lock);
828 if (!(fq->ifq.last_in & INET_FRAG_COMPLETE))
829 inet_frag_kill(&fq->ifq, &frag_state);
831 spin_unlock(&fq->ifq.lock);
832 inet_frag_put(&fq->ifq, &frag_state);
835 const struct vport_ops ovs_capwap_vport_ops = {
836 .type = OVS_VPORT_TYPE_CAPWAP,
837 .flags = VPORT_F_TUN_ID,
840 .create = capwap_create,
841 .destroy = capwap_destroy,
842 .get_name = ovs_tnl_get_name,
843 .get_options = ovs_tnl_get_options,
844 .set_options = ovs_tnl_set_options,
845 .send = ovs_tnl_send,
848 #warning CAPWAP tunneling will not be available on kernels before 2.6.26
849 #endif /* Linux kernel < 2.6.26 */