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>
30 #include "vport-generic.h"
32 #define CAPWAP_SRC_PORT 58881
33 #define CAPWAP_DST_PORT 58882
35 #define CAPWAP_FRAG_TIMEOUT (30 * HZ)
36 #define CAPWAP_FRAG_MAX_MEM (256 * 1024)
37 #define CAPWAP_FRAG_PRUNE_MEM (192 * 1024)
38 #define CAPWAP_FRAG_SECRET_INTERVAL (10 * 60 * HZ)
41 * The CAPWAP header is a mess, with all kinds of odd size bit fields that
42 * cross byte boundaries, which are difficult to represent correctly in
43 * various byte orderings. Luckily we only care about a few permutations, so
44 * statically create them and we can do very fast parsing by checking all 12
47 #define CAPWAP_PREAMBLE_MASK __cpu_to_be32(0xFF000000)
48 #define CAPWAP_HLEN_SHIFT 17
49 #define CAPWAP_HLEN_MASK __cpu_to_be32(0x00F80000)
50 #define CAPWAP_RID_MASK __cpu_to_be32(0x0007C000)
51 #define CAPWAP_WBID_MASK __cpu_to_be32(0x00003E00)
52 #define CAPWAP_F_MASK __cpu_to_be32(0x000001FF)
54 #define CAPWAP_F_FRAG __cpu_to_be32(0x00000080)
55 #define CAPWAP_F_LASTFRAG __cpu_to_be32(0x00000040)
56 #define CAPWAP_F_WSI __cpu_to_be32(0x00000020)
57 #define CAPWAP_F_RMAC __cpu_to_be32(0x00000010)
59 #define CAPWAP_RMAC_LEN 4
61 /* Standard CAPWAP looks for a WBID value of 2.
62 * When we insert WSI field, use WBID value of 30, which has been
63 * proposed for all "experimental" usage - users with no reserved WBID value
66 #define CAPWAP_WBID_30 __cpu_to_be32(0x00003C00)
67 #define CAPWAP_WBID_2 __cpu_to_be32(0x00000200)
69 #define FRAG_HDR (CAPWAP_F_FRAG)
70 #define FRAG_LAST_HDR (FRAG_HDR | CAPWAP_F_LASTFRAG)
72 /* Keyed packet, WBID 30, and length long enough to include WSI key */
73 #define CAPWAP_KEYED (CAPWAP_WBID_30 | CAPWAP_F_WSI | htonl(20 << CAPWAP_HLEN_SHIFT))
74 /* A backward-compatible packet, WBID 2 and length of 2 words (no WSI fields) */
75 #define CAPWAP_NO_WSI (CAPWAP_WBID_2 | htonl(8 << CAPWAP_HLEN_SHIFT))
77 /* Mask for all parts of header that must be 0. */
78 #define CAPWAP_ZERO_MASK (CAPWAP_PREAMBLE_MASK | \
79 (CAPWAP_F_MASK ^ (CAPWAP_F_WSI | CAPWAP_F_FRAG | CAPWAP_F_LASTFRAG | CAPWAP_F_RMAC)))
84 /* low 3 bits of frag_off are reserved */
89 * We use the WSI field to hold additional tunnel data.
90 * The first eight bits store the size of the wsi data in bytes.
92 struct capwaphdr_wsi {
95 __be16 reserved_padding;
98 struct capwaphdr_wsi_key {
102 /* Flag indicating a 64bit key is stored in WSI data field */
103 #define CAPWAP_WSI_F_KEY64 0x80
105 static struct capwaphdr *capwap_hdr(const struct sk_buff *skb)
107 return (struct capwaphdr *)(udp_hdr(skb) + 1);
111 * The fragment offset is actually the high 13 bits of the last 16 bit field,
112 * so we would normally need to right shift 3 places. However, it stores the
113 * offset in 8 byte chunks, which would involve a 3 place left shift. So we
114 * just mask off the last 3 bits and be done with it.
116 #define FRAG_OFF_MASK (~0x7U)
119 * The minimum header length. The header may be longer if the optional
122 #define CAPWAP_MIN_HLEN (sizeof(struct udphdr) + sizeof(struct capwaphdr))
131 struct inet_frag_queue ifq;
132 struct frag_match match;
138 #define FRAG_CB(skb) ((struct frag_skb_cb *)(skb)->cb)
140 static struct sk_buff *fragment(struct sk_buff *, const struct vport *,
141 struct dst_entry *dst, unsigned int hlen);
142 static struct sk_buff *defrag(struct sk_buff *, bool frag_last);
144 static void capwap_frag_init(struct inet_frag_queue *, void *match);
145 static unsigned int capwap_frag_hash(struct inet_frag_queue *);
146 static int capwap_frag_match(struct inet_frag_queue *, void *match);
147 static void capwap_frag_expire(unsigned long ifq);
149 static struct inet_frags frag_state = {
150 .constructor = capwap_frag_init,
151 .qsize = sizeof(struct frag_queue),
152 .hashfn = capwap_frag_hash,
153 .match = capwap_frag_match,
154 .frag_expire = capwap_frag_expire,
155 .secret_interval = CAPWAP_FRAG_SECRET_INTERVAL,
158 static int get_capwap_param(const struct tnl_mutable_config *mutable,
159 const struct ovs_key_ipv4_tunnel *tun_key,
160 u32 *flags, __be64 *out_key)
162 if (tun_key->ipv4_dst) {
165 if (tun_key->tun_flags & OVS_FLOW_TNL_F_KEY)
166 *flags = TNL_F_OUT_KEY_ACTION;
167 if (tun_key->tun_flags & OVS_FLOW_TNL_F_CSUM)
168 *flags |= TNL_F_CSUM;
169 *out_key = tun_key->tun_id;
171 *flags = mutable->flags;
172 if (mutable->flags & TNL_F_OUT_KEY_ACTION) {
173 if (likely(tun_key->tun_flags & OVS_FLOW_TNL_F_KEY)) {
174 *out_key = tun_key->tun_id;
180 *out_key = mutable->out_key;
186 static int capwap_hdr_len(const struct tnl_mutable_config *mutable,
187 const struct ovs_key_ipv4_tunnel *tun_key)
189 int size = CAPWAP_MIN_HLEN;
194 err = get_capwap_param(mutable, tun_key, &flags, &out_key);
198 /* CAPWAP has no checksums. */
199 if (flags & TNL_F_CSUM)
202 /* if keys are specified, then add WSI field */
203 if (out_key || (flags & TNL_F_OUT_KEY_ACTION)) {
204 size += sizeof(struct capwaphdr_wsi) +
205 sizeof(struct capwaphdr_wsi_key);
211 static void capwap_build_header(const struct vport *vport,
212 const struct tnl_mutable_config *mutable,
213 const struct ovs_key_ipv4_tunnel *tun_key,
216 struct udphdr *udph = header;
217 struct capwaphdr *cwh = (struct capwaphdr *)(udph + 1);
221 get_capwap_param(mutable, tun_key, &flags, &out_key);
223 udph->source = htons(CAPWAP_SRC_PORT);
224 udph->dest = htons(CAPWAP_DST_PORT);
230 if (out_key || (flags & TNL_F_OUT_KEY_ACTION)) {
231 struct capwaphdr_wsi *wsi = (struct capwaphdr_wsi *)(cwh + 1);
233 cwh->begin = CAPWAP_KEYED;
235 /* -1 for wsi_len byte, not included in length as per spec */
236 wsi->wsi_len = sizeof(struct capwaphdr_wsi) - 1
237 + sizeof(struct capwaphdr_wsi_key);
238 wsi->flags = CAPWAP_WSI_F_KEY64;
239 wsi->reserved_padding = 0;
242 struct capwaphdr_wsi_key *opt = (struct capwaphdr_wsi_key *)(wsi + 1);
246 /* make packet readable by old capwap code */
247 cwh->begin = CAPWAP_NO_WSI;
251 static struct sk_buff *capwap_update_header(const struct vport *vport,
252 const struct tnl_mutable_config *mutable,
253 struct dst_entry *dst,
257 const struct ovs_key_ipv4_tunnel *tun_key = OVS_CB(skb)->tun_key;
258 struct udphdr *udph = udp_hdr(skb);
262 if (get_capwap_param(mutable, tun_key, &flags, &out_key)) {
267 if (flags & TNL_F_OUT_KEY_ACTION) {
268 /* first field in WSI is key */
269 struct capwaphdr *cwh = (struct capwaphdr *)(udph + 1);
270 struct capwaphdr_wsi *wsi = (struct capwaphdr_wsi *)(cwh + 1);
271 struct capwaphdr_wsi_key *opt = (struct capwaphdr_wsi_key *)(wsi + 1);
276 udph->len = htons(skb->len - skb_transport_offset(skb));
278 if (unlikely(skb->len - skb_network_offset(skb) > dst_mtu(dst))) {
279 unsigned int hlen = skb_transport_offset(skb) + capwap_hdr_len(mutable, tun_key);
280 skb = fragment(skb, vport, dst, hlen);
286 static int process_capwap_wsi(struct sk_buff *skb, __be64 *key, bool *key_present)
288 struct capwaphdr *cwh = capwap_hdr(skb);
289 struct capwaphdr_wsi *wsi;
294 if (((cwh->begin & CAPWAP_WBID_MASK) != CAPWAP_WBID_30))
297 if (cwh->begin & CAPWAP_F_RMAC)
298 rmac_len = CAPWAP_RMAC_LEN;
300 hdr_len = ntohl(cwh->begin & CAPWAP_HLEN_MASK) >> CAPWAP_HLEN_SHIFT;
302 if (unlikely(sizeof(struct capwaphdr) + rmac_len + sizeof(struct capwaphdr_wsi) > hdr_len))
305 /* read wsi header to find out how big it really is */
306 wsi = (struct capwaphdr_wsi *)((u8 *)(cwh + 1) + rmac_len);
307 /* +1 for length byte not included in wsi_len */
308 wsi_len = 1 + wsi->wsi_len;
310 if (unlikely(sizeof(struct capwaphdr) + rmac_len + wsi_len != hdr_len))
313 wsi_len -= sizeof(struct capwaphdr_wsi);
315 if (wsi->flags & CAPWAP_WSI_F_KEY64) {
316 struct capwaphdr_wsi_key *opt;
318 if (unlikely(wsi_len < sizeof(struct capwaphdr_wsi_key)))
321 opt = (struct capwaphdr_wsi_key *)(wsi + 1);
325 *key_present = false;
331 static struct sk_buff *process_capwap_proto(struct sk_buff *skb, __be64 *key, bool *key_present)
333 struct capwaphdr *cwh = capwap_hdr(skb);
334 int hdr_len = sizeof(struct udphdr);
336 if (unlikely((cwh->begin & CAPWAP_ZERO_MASK) != 0))
339 hdr_len += ntohl(cwh->begin & CAPWAP_HLEN_MASK) >> CAPWAP_HLEN_SHIFT;
340 if (unlikely(hdr_len < CAPWAP_MIN_HLEN))
343 if (unlikely(!pskb_may_pull(skb, hdr_len + ETH_HLEN)))
346 cwh = capwap_hdr(skb);
347 __skb_pull(skb, hdr_len);
348 skb_postpull_rcsum(skb, skb_transport_header(skb), hdr_len + ETH_HLEN);
350 if (cwh->begin & CAPWAP_F_FRAG) {
351 skb = defrag(skb, (__force bool)(cwh->begin & CAPWAP_F_LASTFRAG));
354 cwh = capwap_hdr(skb);
357 if ((cwh->begin & CAPWAP_F_WSI) && process_capwap_wsi(skb, key, key_present))
366 /* Called with rcu_read_lock and BH disabled. */
367 static int capwap_rcv(struct sock *sk, struct sk_buff *skb)
370 const struct tnl_mutable_config *mutable;
372 struct ovs_key_ipv4_tunnel tun_key;
374 bool key_present = false;
376 if (unlikely(!pskb_may_pull(skb, CAPWAP_MIN_HLEN + ETH_HLEN)))
379 skb = process_capwap_proto(skb, &key, &key_present);
384 vport = ovs_tnl_find_port(sock_net(sk), iph->daddr, iph->saddr, key,
385 TNL_T_PROTO_CAPWAP, &mutable);
386 if (unlikely(!vport)) {
387 icmp_send(skb, ICMP_DEST_UNREACH, ICMP_PORT_UNREACH, 0);
391 if (key_present && mutable->key.daddr &&
392 !(mutable->flags & TNL_F_IN_KEY_MATCH))
395 tnl_tun_key_init(&tun_key, iph, key, key_present ? OVS_FLOW_TNL_F_KEY : 0);
396 OVS_CB(skb)->tun_key = &tun_key;
398 ovs_tnl_rcv(vport, skb);
407 static const struct tnl_ops capwap_tnl_ops = {
408 .tunnel_type = TNL_T_PROTO_CAPWAP,
409 .ipproto = IPPROTO_UDP,
410 .hdr_len = capwap_hdr_len,
411 .build_header = capwap_build_header,
412 .update_header = capwap_update_header,
415 static inline struct capwap_net *ovs_get_capwap_net(struct net *net)
417 struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
418 return &ovs_net->vport_net.capwap;
421 /* Arbitrary value. Irrelevant as long as it's not 0 since we set the handler. */
422 #define UDP_ENCAP_CAPWAP 10
423 static int init_socket(struct net *net)
426 struct capwap_net *capwap_net = ovs_get_capwap_net(net);
427 struct sockaddr_in sin;
429 if (capwap_net->n_tunnels) {
430 capwap_net->n_tunnels++;
434 err = sock_create_kern(AF_INET, SOCK_DGRAM, 0,
435 &capwap_net->capwap_rcv_socket);
439 /* release net ref. */
440 sk_change_net(capwap_net->capwap_rcv_socket->sk, net);
442 sin.sin_family = AF_INET;
443 sin.sin_addr.s_addr = htonl(INADDR_ANY);
444 sin.sin_port = htons(CAPWAP_DST_PORT);
446 err = kernel_bind(capwap_net->capwap_rcv_socket,
447 (struct sockaddr *)&sin,
448 sizeof(struct sockaddr_in));
452 udp_sk(capwap_net->capwap_rcv_socket->sk)->encap_type = UDP_ENCAP_CAPWAP;
453 udp_sk(capwap_net->capwap_rcv_socket->sk)->encap_rcv = capwap_rcv;
455 capwap_net->frag_state.timeout = CAPWAP_FRAG_TIMEOUT;
456 capwap_net->frag_state.high_thresh = CAPWAP_FRAG_MAX_MEM;
457 capwap_net->frag_state.low_thresh = CAPWAP_FRAG_PRUNE_MEM;
459 inet_frags_init_net(&capwap_net->frag_state);
461 capwap_net->n_tunnels++;
465 sk_release_kernel(capwap_net->capwap_rcv_socket->sk);
467 pr_warn("cannot register capwap protocol handler : %d\n", err);
471 static void release_socket(struct net *net)
473 struct capwap_net *capwap_net = ovs_get_capwap_net(net);
475 capwap_net->n_tunnels--;
476 if (capwap_net->n_tunnels)
479 inet_frags_exit_net(&capwap_net->frag_state, &frag_state);
480 sk_release_kernel(capwap_net->capwap_rcv_socket->sk);
483 static struct vport *capwap_create(const struct vport_parms *parms)
488 err = init_socket(ovs_dp_get_net(parms->dp));
492 vport = ovs_tnl_create(parms, &ovs_capwap_vport_ops, &capwap_tnl_ops);
494 release_socket(ovs_dp_get_net(parms->dp));
499 static void capwap_destroy(struct vport *vport)
501 ovs_tnl_destroy(vport);
502 release_socket(ovs_dp_get_net(vport->dp));
505 static int capwap_init(void)
507 inet_frags_init(&frag_state);
511 static void capwap_exit(void)
513 inet_frags_fini(&frag_state);
516 static void copy_skb_metadata(struct sk_buff *from, struct sk_buff *to)
518 to->pkt_type = from->pkt_type;
519 to->priority = from->priority;
520 to->protocol = from->protocol;
521 skb_dst_set(to, dst_clone(skb_dst(from)));
523 to->mark = from->mark;
526 skb_set_owner_w(to, from->sk);
528 #ifdef CONFIG_NET_SCHED
529 to->tc_index = from->tc_index;
531 #if defined(CONFIG_IP_VS) || defined(CONFIG_IP_VS_MODULE)
532 to->ipvs_property = from->ipvs_property;
534 skb_copy_secmark(to, from);
537 static struct sk_buff *fragment(struct sk_buff *skb, const struct vport *vport,
538 struct dst_entry *dst, unsigned int hlen)
540 struct tnl_vport *tnl_vport = tnl_vport_priv(vport);
541 unsigned int headroom;
542 unsigned int max_frame_len = dst_mtu(dst) + skb_network_offset(skb);
543 struct sk_buff *result = NULL, *list_cur = NULL;
544 unsigned int remaining;
548 if (hlen + ~FRAG_OFF_MASK + 1 > max_frame_len) {
550 pr_warn("capwap link mtu (%d) is less than minimum packet (%d)\n",
552 hlen - skb_network_offset(skb) + ~FRAG_OFF_MASK + 1);
556 remaining = skb->len - hlen;
558 frag_id = htons(atomic_inc_return(&tnl_vport->frag_id));
560 headroom = dst->header_len + 16;
561 if (!skb_network_offset(skb))
562 headroom += LL_RESERVED_SPACE(dst->dev);
565 struct sk_buff *skb2;
568 struct capwaphdr *cwh;
570 frag_size = min(remaining, max_frame_len - hlen);
571 if (remaining > frag_size)
572 frag_size &= FRAG_OFF_MASK;
574 skb2 = alloc_skb(headroom + hlen + frag_size, GFP_ATOMIC);
578 skb_reserve(skb2, headroom);
579 __skb_put(skb2, hlen + frag_size);
581 if (skb_network_offset(skb))
582 skb_reset_mac_header(skb2);
583 skb_set_network_header(skb2, skb_network_offset(skb));
584 skb_set_transport_header(skb2, skb_transport_offset(skb));
586 /* Copy (Ethernet)/IP/UDP/CAPWAP header. */
587 copy_skb_metadata(skb, skb2);
588 skb_copy_from_linear_data(skb, skb2->data, hlen);
590 /* Copy this data chunk. */
591 if (skb_copy_bits(skb, hlen + offset, skb2->data + hlen, frag_size))
594 udph = udp_hdr(skb2);
595 udph->len = htons(skb2->len - skb_transport_offset(skb2));
597 cwh = capwap_hdr(skb2);
598 if (remaining > frag_size)
599 cwh->begin |= FRAG_HDR;
601 cwh->begin |= FRAG_LAST_HDR;
602 cwh->frag_id = frag_id;
603 cwh->frag_off = htons(offset);
606 list_cur->next = skb2;
609 result = list_cur = skb2;
612 remaining -= frag_size;
619 ovs_tnl_free_linked_skbs(result);
624 /* All of the following functions relate to fragmentation reassembly. */
626 static struct frag_queue *ifq_cast(struct inet_frag_queue *ifq)
628 return container_of(ifq, struct frag_queue, ifq);
631 static u32 frag_hash(struct frag_match *match)
633 return jhash_3words((__force u16)match->id, (__force u32)match->saddr,
634 (__force u32)match->daddr,
635 frag_state.rnd) & (INETFRAGS_HASHSZ - 1);
638 static struct frag_queue *queue_find(struct netns_frags *ns_frag_state,
639 struct frag_match *match)
641 struct inet_frag_queue *ifq;
643 read_lock(&frag_state.lock);
645 ifq = inet_frag_find(ns_frag_state, &frag_state, match, frag_hash(match));
649 /* Unlock happens inside inet_frag_find(). */
651 return ifq_cast(ifq);
654 static struct sk_buff *frag_reasm(struct frag_queue *fq, struct net_device *dev)
656 struct sk_buff *head = fq->ifq.fragments;
657 struct sk_buff *frag;
659 /* Succeed or fail, we're done with this queue. */
660 inet_frag_kill(&fq->ifq, &frag_state);
662 if (fq->ifq.len > 65535)
665 /* Can't have the head be a clone. */
666 if (skb_cloned(head) && pskb_expand_head(head, 0, 0, GFP_ATOMIC))
670 * We're about to build frag list for this SKB. If it already has a
671 * frag list, alloc a new SKB and put the existing frag list there.
673 if (skb_shinfo(head)->frag_list) {
677 frag = alloc_skb(0, GFP_ATOMIC);
681 frag->next = head->next;
683 skb_shinfo(frag)->frag_list = skb_shinfo(head)->frag_list;
684 skb_shinfo(head)->frag_list = NULL;
686 for (i = 0; i < skb_shinfo(head)->nr_frags; i++)
687 paged_len += skb_shinfo(head)->frags[i].size;
688 frag->len = frag->data_len = head->data_len - paged_len;
689 head->data_len -= frag->len;
690 head->len -= frag->len;
692 frag->ip_summed = head->ip_summed;
693 atomic_add(frag->truesize, &fq->ifq.net->mem);
696 skb_shinfo(head)->frag_list = head->next;
697 atomic_sub(head->truesize, &fq->ifq.net->mem);
699 /* Properly account for data in various packets. */
700 for (frag = head->next; frag; frag = frag->next) {
701 head->data_len += frag->len;
702 head->len += frag->len;
704 if (head->ip_summed != frag->ip_summed)
705 head->ip_summed = CHECKSUM_NONE;
706 else if (head->ip_summed == CHECKSUM_COMPLETE)
707 head->csum = csum_add(head->csum, frag->csum);
709 head->truesize += frag->truesize;
710 atomic_sub(frag->truesize, &fq->ifq.net->mem);
715 head->tstamp = fq->ifq.stamp;
716 fq->ifq.fragments = NULL;
721 static struct sk_buff *frag_queue(struct frag_queue *fq, struct sk_buff *skb,
722 u16 offset, bool frag_last)
724 struct sk_buff *prev, *next;
725 struct net_device *dev;
728 if (fq->ifq.last_in & INET_FRAG_COMPLETE)
734 end = offset + skb->len;
738 * Last fragment, shouldn't already have data past our end or
739 * have another last fragment.
741 if (end < fq->ifq.len || fq->ifq.last_in & INET_FRAG_LAST_IN)
744 fq->ifq.last_in |= INET_FRAG_LAST_IN;
747 /* Fragments should align to 8 byte chunks. */
748 if (end & ~FRAG_OFF_MASK)
751 if (end > fq->ifq.len) {
753 * Shouldn't have data past the end, if we already
756 if (fq->ifq.last_in & INET_FRAG_LAST_IN)
763 /* Find where we fit in. */
765 for (next = fq->ifq.fragments; next != NULL; next = next->next) {
766 if (FRAG_CB(next)->offset >= offset)
772 * Overlapping fragments aren't allowed. We shouldn't start before
773 * the end of the previous fragment.
775 if (prev && FRAG_CB(prev)->offset + prev->len > offset)
778 /* We also shouldn't end after the beginning of the next fragment. */
779 if (next && end > FRAG_CB(next)->offset)
782 FRAG_CB(skb)->offset = offset;
784 /* Link into list. */
789 fq->ifq.fragments = skb;
794 fq->ifq.stamp = skb->tstamp;
795 fq->ifq.meat += skb->len;
796 atomic_add(skb->truesize, &fq->ifq.net->mem);
798 fq->ifq.last_in |= INET_FRAG_FIRST_IN;
800 /* If we have all fragments do reassembly. */
801 if (fq->ifq.last_in == (INET_FRAG_FIRST_IN | INET_FRAG_LAST_IN) &&
802 fq->ifq.meat == fq->ifq.len)
803 return frag_reasm(fq, dev);
805 write_lock(&frag_state.lock);
806 list_move_tail(&fq->ifq.lru_list, &fq->ifq.net->lru_list);
807 write_unlock(&frag_state.lock);
816 static struct sk_buff *defrag(struct sk_buff *skb, bool frag_last)
818 struct iphdr *iph = ip_hdr(skb);
819 struct capwaphdr *cwh = capwap_hdr(skb);
820 struct capwap_net *capwap_net = ovs_get_capwap_net(dev_net(skb->dev));
821 struct netns_frags *ns_frag_state = &capwap_net->frag_state;
822 struct frag_match match;
824 struct frag_queue *fq;
826 if (atomic_read(&ns_frag_state->mem) > ns_frag_state->high_thresh)
827 inet_frag_evictor(ns_frag_state, &frag_state);
829 match.daddr = iph->daddr;
830 match.saddr = iph->saddr;
831 match.id = cwh->frag_id;
832 frag_off = ntohs(cwh->frag_off) & FRAG_OFF_MASK;
834 fq = queue_find(ns_frag_state, &match);
836 spin_lock(&fq->ifq.lock);
837 skb = frag_queue(fq, skb, frag_off, frag_last);
838 spin_unlock(&fq->ifq.lock);
840 inet_frag_put(&fq->ifq, &frag_state);
849 static void capwap_frag_init(struct inet_frag_queue *ifq, void *match_)
851 struct frag_match *match = match_;
853 ifq_cast(ifq)->match = *match;
856 static unsigned int capwap_frag_hash(struct inet_frag_queue *ifq)
858 return frag_hash(&ifq_cast(ifq)->match);
861 static int capwap_frag_match(struct inet_frag_queue *ifq, void *a_)
863 struct frag_match *a = a_;
864 struct frag_match *b = &ifq_cast(ifq)->match;
866 return a->id == b->id && a->saddr == b->saddr && a->daddr == b->daddr;
869 /* Run when the timeout for a given queue expires. */
870 static void capwap_frag_expire(unsigned long ifq)
872 struct frag_queue *fq;
874 fq = ifq_cast((struct inet_frag_queue *)ifq);
876 spin_lock(&fq->ifq.lock);
878 if (!(fq->ifq.last_in & INET_FRAG_COMPLETE))
879 inet_frag_kill(&fq->ifq, &frag_state);
881 spin_unlock(&fq->ifq.lock);
882 inet_frag_put(&fq->ifq, &frag_state);
885 const struct vport_ops ovs_capwap_vport_ops = {
886 .type = OVS_VPORT_TYPE_CAPWAP,
887 .flags = VPORT_F_TUN_ID,
890 .create = capwap_create,
891 .destroy = capwap_destroy,
892 .set_addr = ovs_tnl_set_addr,
893 .get_name = ovs_tnl_get_name,
894 .get_addr = ovs_tnl_get_addr,
895 .get_options = ovs_tnl_get_options,
896 .set_options = ovs_tnl_set_options,
897 .get_dev_flags = ovs_vport_gen_get_dev_flags,
898 .is_running = ovs_vport_gen_is_running,
899 .get_operstate = ovs_vport_gen_get_operstate,
900 .send = ovs_tnl_send,
903 #warning CAPWAP tunneling will not be available on kernels before 2.6.26
904 #endif /* Linux kernel < 2.6.26 */