2 * Copyright (c) 2003 IPNET Internet Communication Company
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26 * Author: Ruslan Ermilov <ru@FreeBSD.org>
31 #include <sys/param.h>
32 #include <sys/errno.h>
33 #include <sys/kernel.h>
34 #include <sys/malloc.h>
36 #include <sys/queue.h>
37 #include <sys/socket.h>
38 #include <sys/systm.h>
40 #include <net/ethernet.h>
42 #include <net/if_vlan_var.h>
44 #include <netgraph/ng_message.h>
45 #include <netgraph/ng_parse.h>
46 #include <netgraph/ng_vlan.h>
47 #include <netgraph/netgraph.h>
49 static ng_constructor_t ng_vlan_constructor;
50 static ng_rcvmsg_t ng_vlan_rcvmsg;
51 static ng_shutdown_t ng_vlan_shutdown;
52 static ng_newhook_t ng_vlan_newhook;
53 static ng_rcvdata_t ng_vlan_rcvdata;
54 static ng_disconnect_t ng_vlan_disconnect;
56 /* Parse type for struct ng_vlan_filter. */
57 static const struct ng_parse_struct_field ng_vlan_filter_fields[] =
58 NG_VLAN_FILTER_FIELDS;
59 static const struct ng_parse_type ng_vlan_filter_type = {
60 &ng_parse_struct_type,
61 &ng_vlan_filter_fields
65 ng_vlan_getTableLength(const struct ng_parse_type *type,
66 const u_char *start, const u_char *buf)
68 const struct ng_vlan_table *const table =
69 (const struct ng_vlan_table *)(buf - sizeof(u_int32_t));
74 /* Parse type for struct ng_vlan_table. */
75 static const struct ng_parse_array_info ng_vlan_table_array_info = {
77 ng_vlan_getTableLength
79 static const struct ng_parse_type ng_vlan_table_array_type = {
81 &ng_vlan_table_array_info
83 static const struct ng_parse_struct_field ng_vlan_table_fields[] =
85 static const struct ng_parse_type ng_vlan_table_type = {
86 &ng_parse_struct_type,
90 /* List of commands and how to convert arguments to/from ASCII. */
91 static const struct ng_cmdlist ng_vlan_cmdlist[] = {
103 &ng_parse_hookbuf_type,
116 static struct ng_type ng_vlan_typestruct = {
117 .version = NG_ABI_VERSION,
118 .name = NG_VLAN_NODE_TYPE,
119 .constructor = ng_vlan_constructor,
120 .rcvmsg = ng_vlan_rcvmsg,
121 .shutdown = ng_vlan_shutdown,
122 .newhook = ng_vlan_newhook,
123 .rcvdata = ng_vlan_rcvdata,
124 .disconnect = ng_vlan_disconnect,
125 .cmdlist = ng_vlan_cmdlist,
127 NETGRAPH_INIT(vlan, &ng_vlan_typestruct);
130 LIST_ENTRY(filter) next;
136 #define HASH(id) ((((id) >> 8) ^ ((id) >> 4) ^ (id)) & 0x0f)
137 LIST_HEAD(filterhead, filter);
140 hook_p downstream_hook;
142 struct filterhead hashtable[HASHSIZE];
146 static struct filter *
147 ng_vlan_findentry(priv_p priv, u_int16_t vlan)
149 struct filterhead *chain = &priv->hashtable[HASH(vlan)];
152 LIST_FOREACH(f, chain, next)
159 ng_vlan_constructor(node_p node)
164 priv = malloc(sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
167 for (i = 0; i < HASHSIZE; i++)
168 LIST_INIT(&priv->hashtable[i]);
169 NG_NODE_SET_PRIVATE(node, priv);
174 ng_vlan_newhook(node_p node, hook_p hook, const char *name)
176 const priv_p priv = NG_NODE_PRIVATE(node);
178 if (strcmp(name, NG_VLAN_HOOK_DOWNSTREAM) == 0)
179 priv->downstream_hook = hook;
180 else if (strcmp(name, NG_VLAN_HOOK_NOMATCH) == 0)
181 priv->nomatch_hook = hook;
184 * Any other hook name is valid and can
185 * later be associated with a filter rule.
188 NG_HOOK_SET_PRIVATE(hook, NULL);
193 ng_vlan_rcvmsg(node_p node, item_p item, hook_p lasthook)
195 const priv_p priv = NG_NODE_PRIVATE(node);
197 struct ng_mesg *msg, *resp = NULL;
198 struct ng_vlan_filter *vf;
201 struct ng_vlan_table *t;
204 NGI_GET_MSG(item, msg);
205 /* Deal with message according to cookie and command. */
206 switch (msg->header.typecookie) {
207 case NGM_VLAN_COOKIE:
208 switch (msg->header.cmd) {
209 case NGM_VLAN_ADD_FILTER:
210 /* Check that message is long enough. */
211 if (msg->header.arglen != sizeof(*vf)) {
215 vf = (struct ng_vlan_filter *)msg->data;
216 /* Sanity check the VLAN ID value. */
217 if (vf->vlan & ~EVL_VLID_MASK) {
221 /* Check that a referenced hook exists. */
222 hook = ng_findhook(node, vf->hook);
227 /* And is not one of the special hooks. */
228 if (hook == priv->downstream_hook ||
229 hook == priv->nomatch_hook) {
233 /* And is not already in service. */
234 if (NG_HOOK_PRIVATE(hook) != NULL) {
238 /* Check we don't already trap this VLAN. */
239 if (ng_vlan_findentry(priv, vf->vlan)) {
244 f = malloc(sizeof(*f),
245 M_NETGRAPH, M_NOWAIT | M_ZERO);
250 /* Link filter and hook together. */
253 NG_HOOK_SET_PRIVATE(hook, f);
254 /* Register filter in a hash table. */
256 &priv->hashtable[HASH(f->vlan)], f, next);
259 case NGM_VLAN_DEL_FILTER:
260 /* Check that message is long enough. */
261 if (msg->header.arglen != NG_HOOKSIZ) {
265 /* Check that hook exists and is active. */
266 hook = ng_findhook(node, (char *)msg->data);
268 (f = NG_HOOK_PRIVATE(hook)) == NULL) {
272 /* Purge a rule that refers to this hook. */
273 NG_HOOK_SET_PRIVATE(hook, NULL);
274 LIST_REMOVE(f, next);
278 case NGM_VLAN_GET_TABLE:
279 NG_MKRESPONSE(resp, msg, sizeof(*t) +
280 priv->nent * sizeof(*t->filter), M_NOWAIT);
285 t = (struct ng_vlan_table *)resp->data;
288 for (i = 0; i < HASHSIZE; i++) {
289 LIST_FOREACH(f, &priv->hashtable[i], next) {
291 strncpy(vf->hook, NG_HOOK_NAME(f->hook),
297 default: /* Unknown command. */
302 case NGM_FLOW_COOKIE:
304 struct ng_mesg *copy;
305 struct filterhead *chain;
309 * Flow control messages should come only
313 if (lasthook == NULL)
315 if (lasthook != priv->downstream_hook)
318 /* Broadcast the event to all uplinks. */
319 for (i = 0, chain = priv->hashtable; i < HASHSIZE;
321 LIST_FOREACH(f, chain, next) {
322 NG_COPYMESSAGE(copy, msg, M_NOWAIT);
325 NG_SEND_MSG_HOOK(error, node, copy, f->hook, 0);
330 default: /* Unknown type cookie. */
334 NG_RESPOND_MSG(error, node, item, resp);
340 ng_vlan_rcvdata(hook_p hook, item_p item)
342 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
343 struct ether_header *eh;
344 struct ether_vlan_header *evl = NULL;
350 /* Make sure we have an entire header. */
352 if (m->m_len < sizeof(*eh) &&
353 (m = m_pullup(m, sizeof(*eh))) == NULL) {
357 eh = mtod(m, struct ether_header *);
358 if (hook == priv->downstream_hook) {
360 * If from downstream, select between a match hook
361 * or the nomatch hook.
363 if (m->m_flags & M_VLANTAG ||
364 eh->ether_type == htons(ETHERTYPE_VLAN)) {
365 if (m->m_flags & M_VLANTAG) {
367 * Packet is tagged, m contains a normal
368 * Ethernet frame; tag is stored out-of-band.
370 vlan = EVL_VLANOFTAG(m->m_pkthdr.ether_vtag);
372 if (m->m_len < sizeof(*evl) &&
373 (m = m_pullup(m, sizeof(*evl))) == NULL) {
377 evl = mtod(m, struct ether_vlan_header *);
378 vlan = EVL_VLANOFTAG(ntohs(evl->evl_tag));
380 if ((f = ng_vlan_findentry(priv, vlan)) != NULL) {
381 if (m->m_flags & M_VLANTAG) {
382 m->m_pkthdr.ether_vtag = 0;
383 m->m_flags &= ~M_VLANTAG;
385 evl->evl_encap_proto = evl->evl_proto;
386 bcopy(mtod(m, caddr_t),
388 ETHER_VLAN_ENCAP_LEN,
390 m_adj(m, ETHER_VLAN_ENCAP_LEN);
396 NG_FWD_NEW_DATA(error, item, f->hook, m);
398 NG_FWD_NEW_DATA(error, item, priv->nomatch_hook, m);
401 * It is heading towards the downstream.
402 * If from nomatch, pass it unmodified.
403 * Otherwise, do the VLAN encapsulation.
405 if (hook != priv->nomatch_hook) {
406 if ((f = NG_HOOK_PRIVATE(hook)) == NULL) {
411 M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
412 /* M_PREPEND takes care of m_len and m_pkthdr.len. */
413 if (m == NULL || (m->m_len < sizeof(*evl) &&
414 (m = m_pullup(m, sizeof(*evl))) == NULL)) {
419 * Transform the Ethernet header into an Ethernet header
420 * with 802.1Q encapsulation.
422 bcopy(mtod(m, char *) + ETHER_VLAN_ENCAP_LEN,
423 mtod(m, char *), ETHER_HDR_LEN);
424 evl = mtod(m, struct ether_vlan_header *);
425 evl->evl_proto = evl->evl_encap_proto;
426 evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
427 evl->evl_tag = htons(f->vlan);
429 NG_FWD_NEW_DATA(error, item, priv->downstream_hook, m);
435 ng_vlan_shutdown(node_p node)
437 const priv_p priv = NG_NODE_PRIVATE(node);
439 NG_NODE_SET_PRIVATE(node, NULL);
441 free(priv, M_NETGRAPH);
446 ng_vlan_disconnect(hook_p hook)
448 const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
451 if (hook == priv->downstream_hook)
452 priv->downstream_hook = NULL;
453 else if (hook == priv->nomatch_hook)
454 priv->nomatch_hook = NULL;
456 /* Purge a rule that refers to this hook. */
457 if ((f = NG_HOOK_PRIVATE(hook)) != NULL) {
458 LIST_REMOVE(f, next);
463 NG_HOOK_SET_PRIVATE(hook, NULL);
464 if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) &&
465 (NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
466 ng_rmnode_self(NG_HOOK_NODE(hook));