470 lines
12 KiB
C
470 lines
12 KiB
C
/*-
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* Copyright (c) 2003 IPNET Internet Communication Company
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*
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* Author: Ruslan Ermilov <ru@FreeBSD.org>
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*
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* $FreeBSD$
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*/
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#include <sys/param.h>
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#include <sys/errno.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/mbuf.h>
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#include <sys/queue.h>
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#include <sys/socket.h>
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#include <sys/systm.h>
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#include <net/ethernet.h>
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#include <net/if.h>
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#include <net/if_vlan_var.h>
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#include <netgraph/ng_message.h>
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#include <netgraph/ng_parse.h>
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#include <netgraph/ng_vlan.h>
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#include <netgraph/netgraph.h>
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static ng_constructor_t ng_vlan_constructor;
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static ng_rcvmsg_t ng_vlan_rcvmsg;
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static ng_shutdown_t ng_vlan_shutdown;
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static ng_newhook_t ng_vlan_newhook;
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static ng_rcvdata_t ng_vlan_rcvdata;
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static ng_disconnect_t ng_vlan_disconnect;
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/* Parse type for struct ng_vlan_filter. */
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static const struct ng_parse_struct_field ng_vlan_filter_fields[] =
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NG_VLAN_FILTER_FIELDS;
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static const struct ng_parse_type ng_vlan_filter_type = {
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&ng_parse_struct_type,
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&ng_vlan_filter_fields
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};
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static int
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ng_vlan_getTableLength(const struct ng_parse_type *type,
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const u_char *start, const u_char *buf)
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{
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const struct ng_vlan_table *const table =
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(const struct ng_vlan_table *)(buf - sizeof(u_int32_t));
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return table->n;
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}
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/* Parse type for struct ng_vlan_table. */
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static const struct ng_parse_array_info ng_vlan_table_array_info = {
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&ng_vlan_filter_type,
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ng_vlan_getTableLength
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};
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static const struct ng_parse_type ng_vlan_table_array_type = {
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&ng_parse_array_type,
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&ng_vlan_table_array_info
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};
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static const struct ng_parse_struct_field ng_vlan_table_fields[] =
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NG_VLAN_TABLE_FIELDS;
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static const struct ng_parse_type ng_vlan_table_type = {
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&ng_parse_struct_type,
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&ng_vlan_table_fields
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};
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/* List of commands and how to convert arguments to/from ASCII. */
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static const struct ng_cmdlist ng_vlan_cmdlist[] = {
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{
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NGM_VLAN_COOKIE,
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NGM_VLAN_ADD_FILTER,
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"addfilter",
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&ng_vlan_filter_type,
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NULL
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},
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{
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NGM_VLAN_COOKIE,
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NGM_VLAN_DEL_FILTER,
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"delfilter",
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&ng_parse_hookbuf_type,
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NULL
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},
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{
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NGM_VLAN_COOKIE,
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NGM_VLAN_GET_TABLE,
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"gettable",
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NULL,
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&ng_vlan_table_type
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},
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{ 0 }
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};
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static struct ng_type ng_vlan_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_VLAN_NODE_TYPE,
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.constructor = ng_vlan_constructor,
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.rcvmsg = ng_vlan_rcvmsg,
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.shutdown = ng_vlan_shutdown,
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.newhook = ng_vlan_newhook,
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.rcvdata = ng_vlan_rcvdata,
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.disconnect = ng_vlan_disconnect,
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.cmdlist = ng_vlan_cmdlist,
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};
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NETGRAPH_INIT(vlan, &ng_vlan_typestruct);
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struct filter {
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LIST_ENTRY(filter) next;
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u_int16_t vlan;
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hook_p hook;
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};
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#define HASHSIZE 16
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#define HASH(id) ((((id) >> 8) ^ ((id) >> 4) ^ (id)) & 0x0f)
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LIST_HEAD(filterhead, filter);
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typedef struct {
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hook_p downstream_hook;
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hook_p nomatch_hook;
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struct filterhead hashtable[HASHSIZE];
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u_int32_t nent;
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} *priv_p;
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static struct filter *
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ng_vlan_findentry(priv_p priv, u_int16_t vlan)
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{
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struct filterhead *chain = &priv->hashtable[HASH(vlan)];
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struct filter *f;
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LIST_FOREACH(f, chain, next)
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if (f->vlan == vlan)
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return (f);
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return (NULL);
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}
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static int
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ng_vlan_constructor(node_p node)
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{
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priv_p priv;
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int i;
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MALLOC(priv, priv_p, sizeof(*priv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (priv == NULL)
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return (ENOMEM);
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for (i = 0; i < HASHSIZE; i++)
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LIST_INIT(&priv->hashtable[i]);
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NG_NODE_SET_PRIVATE(node, priv);
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return (0);
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}
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static int
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ng_vlan_newhook(node_p node, hook_p hook, const char *name)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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if (strcmp(name, NG_VLAN_HOOK_DOWNSTREAM) == 0)
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priv->downstream_hook = hook;
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else if (strcmp(name, NG_VLAN_HOOK_NOMATCH) == 0)
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priv->nomatch_hook = hook;
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else {
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/*
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* Any other hook name is valid and can
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* later be associated with a filter rule.
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*/
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}
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NG_HOOK_SET_PRIVATE(hook, NULL);
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return (0);
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}
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static int
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ng_vlan_rcvmsg(node_p node, item_p item, hook_p lasthook)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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int error = 0;
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struct ng_mesg *msg, *resp = NULL;
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struct ng_vlan_filter *vf;
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struct filter *f;
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hook_p hook;
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struct ng_vlan_table *t;
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int i;
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NGI_GET_MSG(item, msg);
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/* Deal with message according to cookie and command. */
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switch (msg->header.typecookie) {
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case NGM_VLAN_COOKIE:
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switch (msg->header.cmd) {
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case NGM_VLAN_ADD_FILTER:
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/* Check that message is long enough. */
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if (msg->header.arglen != sizeof(*vf)) {
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error = EINVAL;
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break;
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}
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vf = (struct ng_vlan_filter *)msg->data;
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/* Sanity check the VLAN ID value. */
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if (vf->vlan & ~EVL_VLID_MASK) {
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error = EINVAL;
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break;
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}
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/* Check that a referenced hook exists. */
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hook = ng_findhook(node, vf->hook);
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if (hook == NULL) {
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error = ENOENT;
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break;
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}
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/* And is not one of the special hooks. */
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if (hook == priv->downstream_hook ||
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hook == priv->nomatch_hook) {
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error = EINVAL;
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break;
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}
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/* And is not already in service. */
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if (NG_HOOK_PRIVATE(hook) != NULL) {
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error = EEXIST;
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break;
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}
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/* Check we don't already trap this VLAN. */
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if (ng_vlan_findentry(priv, vf->vlan)) {
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error = EEXIST;
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break;
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}
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/* Create filter. */
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MALLOC(f, struct filter *, sizeof(*f),
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M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (f == NULL) {
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error = ENOMEM;
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break;
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}
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/* Link filter and hook together. */
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f->hook = hook;
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f->vlan = vf->vlan;
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NG_HOOK_SET_PRIVATE(hook, f);
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/* Register filter in a hash table. */
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LIST_INSERT_HEAD(
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&priv->hashtable[HASH(f->vlan)], f, next);
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priv->nent++;
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break;
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case NGM_VLAN_DEL_FILTER:
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/* Check that message is long enough. */
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if (msg->header.arglen != NG_HOOKSIZ) {
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error = EINVAL;
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break;
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}
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/* Check that hook exists and is active. */
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hook = ng_findhook(node, (char *)msg->data);
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if (hook == NULL ||
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(f = NG_HOOK_PRIVATE(hook)) == NULL) {
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error = ENOENT;
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break;
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}
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/* Purge a rule that refers to this hook. */
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NG_HOOK_SET_PRIVATE(hook, NULL);
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LIST_REMOVE(f, next);
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priv->nent--;
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FREE(f, M_NETGRAPH);
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break;
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case NGM_VLAN_GET_TABLE:
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NG_MKRESPONSE(resp, msg, sizeof(*t) +
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priv->nent * sizeof(*t->filter), M_NOWAIT);
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if (resp == NULL) {
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error = ENOMEM;
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break;
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}
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t = (struct ng_vlan_table *)resp->data;
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t->n = priv->nent;
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vf = &t->filter[0];
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for (i = 0; i < HASHSIZE; i++) {
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LIST_FOREACH(f, &priv->hashtable[i], next) {
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vf->vlan = f->vlan;
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strncpy(vf->hook, NG_HOOK_NAME(f->hook),
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NG_HOOKSIZ);
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vf++;
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}
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}
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break;
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default: /* Unknown command. */
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error = EINVAL;
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break;
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}
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break;
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case NGM_FLOW_COOKIE:
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{
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struct ng_mesg *copy;
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struct filterhead *chain;
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struct filter *f;
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/*
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* Flow control messages should come only
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* from downstream.
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*/
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if (lasthook == NULL)
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break;
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if (lasthook != priv->downstream_hook)
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break;
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/* Broadcast the event to all uplinks. */
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for (i = 0, chain = priv->hashtable; i < HASHSIZE;
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i++, chain++)
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LIST_FOREACH(f, chain, next) {
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NG_COPYMESSAGE(copy, msg, M_NOWAIT);
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if (copy == NULL)
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continue;
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NG_SEND_MSG_HOOK(error, node, copy, f->hook, 0);
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}
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break;
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}
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default: /* Unknown type cookie. */
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error = EINVAL;
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break;
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}
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NG_RESPOND_MSG(error, node, item, resp);
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NG_FREE_MSG(msg);
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return (error);
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}
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static int
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ng_vlan_rcvdata(hook_p hook, item_p item)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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struct ether_header *eh;
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struct ether_vlan_header *evl;
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int error;
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u_int16_t vlan;
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struct mbuf *m;
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struct m_tag *mtag;
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struct filter *f;
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/* Make sure we have an entire header. */
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NGI_GET_M(item, m);
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if (m->m_len < sizeof(*eh) &&
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(m = m_pullup(m, sizeof(*eh))) == NULL) {
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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eh = mtod(m, struct ether_header *);
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if (hook == priv->downstream_hook) {
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/*
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* If from downstream, select between a match hook
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* or the nomatch hook.
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*/
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mtag = m_tag_locate(m, MTAG_VLAN, MTAG_VLAN_TAG, NULL);
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if (mtag != NULL || eh->ether_type == htons(ETHERTYPE_VLAN)) {
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if (mtag != NULL) {
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/*
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* Packet is tagged, m contains a normal
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* Ethernet frame; tag is stored out-of-band.
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*/
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vlan = EVL_VLANOFTAG(VLAN_TAG_VALUE(mtag));
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(void)&evl; /* XXX silence GCC */
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} else {
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if (m->m_len < sizeof(*evl) &&
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(m = m_pullup(m, sizeof(*evl))) == NULL) {
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NG_FREE_ITEM(item);
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return (EINVAL);
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}
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evl = mtod(m, struct ether_vlan_header *);
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vlan = EVL_VLANOFTAG(ntohs(evl->evl_tag));
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}
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if ((f = ng_vlan_findentry(priv, vlan)) != NULL) {
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if (mtag != NULL)
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m_tag_delete(m, mtag);
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else {
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evl->evl_encap_proto = evl->evl_proto;
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bcopy(mtod(m, caddr_t),
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mtod(m, caddr_t) +
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ETHER_VLAN_ENCAP_LEN,
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ETHER_HDR_LEN);
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m_adj(m, ETHER_VLAN_ENCAP_LEN);
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}
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}
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} else
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f = NULL;
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if (f != NULL)
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NG_FWD_NEW_DATA(error, item, f->hook, m);
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else
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NG_FWD_NEW_DATA(error, item, priv->nomatch_hook, m);
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} else {
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/*
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* It is heading towards the downstream.
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* If from nomatch, pass it unmodified.
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* Otherwise, do the VLAN encapsulation.
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*/
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if (hook != priv->nomatch_hook) {
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if ((f = NG_HOOK_PRIVATE(hook)) == NULL) {
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NG_FREE_ITEM(item);
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NG_FREE_M(m);
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return (EOPNOTSUPP);
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}
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M_PREPEND(m, ETHER_VLAN_ENCAP_LEN, M_DONTWAIT);
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/* M_PREPEND takes care of m_len and m_pkthdr.len. */
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if (m == NULL || (m->m_len < sizeof(*evl) &&
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(m = m_pullup(m, sizeof(*evl))) == NULL)) {
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NG_FREE_ITEM(item);
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return (ENOMEM);
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}
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/*
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* Transform the Ethernet header into an Ethernet header
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* with 802.1Q encapsulation.
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*/
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bcopy(mtod(m, char *) + ETHER_VLAN_ENCAP_LEN,
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mtod(m, char *), ETHER_HDR_LEN);
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evl = mtod(m, struct ether_vlan_header *);
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evl->evl_proto = evl->evl_encap_proto;
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evl->evl_encap_proto = htons(ETHERTYPE_VLAN);
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evl->evl_tag = htons(f->vlan);
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}
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NG_FWD_NEW_DATA(error, item, priv->downstream_hook, m);
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}
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return (error);
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}
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static int
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ng_vlan_shutdown(node_p node)
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{
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const priv_p priv = NG_NODE_PRIVATE(node);
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NG_NODE_SET_PRIVATE(node, NULL);
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NG_NODE_UNREF(node);
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FREE(priv, M_NETGRAPH);
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return (0);
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}
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static int
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ng_vlan_disconnect(hook_p hook)
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{
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const priv_p priv = NG_NODE_PRIVATE(NG_HOOK_NODE(hook));
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struct filter *f;
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if (hook == priv->downstream_hook)
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priv->downstream_hook = NULL;
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else if (hook == priv->nomatch_hook)
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priv->nomatch_hook = NULL;
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else {
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/* Purge a rule that refers to this hook. */
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if ((f = NG_HOOK_PRIVATE(hook)) != NULL) {
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LIST_REMOVE(f, next);
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priv->nent--;
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FREE(f, M_NETGRAPH);
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}
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}
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NG_HOOK_SET_PRIVATE(hook, NULL);
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if ((NG_NODE_NUMHOOKS(NG_HOOK_NODE(hook)) == 0) &&
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(NG_NODE_IS_VALID(NG_HOOK_NODE(hook))))
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ng_rmnode_self(NG_HOOK_NODE(hook));
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return (0);
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}
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