3767cab953
This change fixes (theoretically) possible mbuf leak introduced in r225586. Reorder code a bit and change return codes to be more specific Reviewed by: glebius Approved by: kib (mentor)
361 lines
8.3 KiB
C
361 lines
8.3 KiB
C
/*-
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* Copyright 2005, Gleb Smirnoff <glebius@FreeBSD.org>
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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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* $FreeBSD$
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*/
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/mbuf.h>
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#include <sys/malloc.h>
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#include <sys/ctype.h>
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#include <sys/errno.h>
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#include <sys/rwlock.h>
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#include <sys/socket.h>
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#include <sys/syslog.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/in_var.h>
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#include <netinet/ip_var.h>
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#include <netinet/ip_fw.h>
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#include <netinet/ipfw/ip_fw_private.h>
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#include <netinet/ip.h>
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#include <netinet/ip6.h>
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#include <netinet6/ip6_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_ipfw.h>
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#include <netgraph/netgraph.h>
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static int ng_ipfw_mod_event(module_t mod, int event, void *data);
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static ng_constructor_t ng_ipfw_constructor;
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static ng_shutdown_t ng_ipfw_shutdown;
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static ng_newhook_t ng_ipfw_newhook;
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static ng_connect_t ng_ipfw_connect;
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static ng_findhook_t ng_ipfw_findhook;
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static ng_rcvdata_t ng_ipfw_rcvdata;
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static ng_disconnect_t ng_ipfw_disconnect;
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static hook_p ng_ipfw_findhook1(node_p, u_int16_t );
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static int ng_ipfw_input(struct mbuf **, int, struct ip_fw_args *,
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int);
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/* We have only one node */
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static node_p fw_node;
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/* Netgraph node type descriptor */
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static struct ng_type ng_ipfw_typestruct = {
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.version = NG_ABI_VERSION,
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.name = NG_IPFW_NODE_TYPE,
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.mod_event = ng_ipfw_mod_event,
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.constructor = ng_ipfw_constructor,
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.shutdown = ng_ipfw_shutdown,
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.newhook = ng_ipfw_newhook,
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.connect = ng_ipfw_connect,
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.findhook = ng_ipfw_findhook,
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.rcvdata = ng_ipfw_rcvdata,
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.disconnect = ng_ipfw_disconnect,
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};
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NETGRAPH_INIT(ipfw, &ng_ipfw_typestruct);
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MODULE_DEPEND(ng_ipfw, ipfw, 2, 2, 2);
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/* Information we store for each hook */
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struct ng_ipfw_hook_priv {
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hook_p hook;
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u_int16_t rulenum;
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};
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typedef struct ng_ipfw_hook_priv *hpriv_p;
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static int
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ng_ipfw_mod_event(module_t mod, int event, void *data)
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{
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int error = 0;
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switch (event) {
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case MOD_LOAD:
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if (ng_ipfw_input_p != NULL) {
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error = EEXIST;
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break;
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}
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/* Setup node without any private data */
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if ((error = ng_make_node_common(&ng_ipfw_typestruct, &fw_node))
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!= 0) {
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log(LOG_ERR, "%s: can't create ng_ipfw node", __func__);
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break;
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};
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/* Try to name node */
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if (ng_name_node(fw_node, "ipfw") != 0)
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log(LOG_WARNING, "%s: failed to name node \"ipfw\"",
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__func__);
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/* Register hook */
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ng_ipfw_input_p = ng_ipfw_input;
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break;
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case MOD_UNLOAD:
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/*
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* This won't happen if a node exists.
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* ng_ipfw_input_p is already cleared.
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*/
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break;
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default:
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error = EOPNOTSUPP;
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break;
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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_ipfw_constructor(node_p node)
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{
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return (EINVAL); /* Only one node */
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}
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static int
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ng_ipfw_newhook(node_p node, hook_p hook, const char *name)
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{
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hpriv_p hpriv;
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u_int16_t rulenum;
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const char *cp;
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char *endptr;
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/* Protect from leading zero */
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if (name[0] == '0' && name[1] != '\0')
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return (EINVAL);
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/* Check that name contains only digits */
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for (cp = name; *cp != '\0'; cp++)
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if (!isdigit(*cp))
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return (EINVAL);
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/* Convert it to integer */
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rulenum = (u_int16_t)strtol(name, &endptr, 10);
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if (*endptr != '\0')
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return (EINVAL);
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/* Allocate memory for this hook's private data */
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hpriv = malloc(sizeof(*hpriv), M_NETGRAPH, M_NOWAIT | M_ZERO);
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if (hpriv== NULL)
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return (ENOMEM);
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hpriv->hook = hook;
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hpriv->rulenum = rulenum;
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NG_HOOK_SET_PRIVATE(hook, hpriv);
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return(0);
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}
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/*
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* Set hooks into queueing mode, to avoid recursion between
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* netgraph layer and ip_{input,output}.
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*/
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static int
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ng_ipfw_connect(hook_p hook)
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{
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NG_HOOK_FORCE_QUEUE(hook);
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return (0);
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}
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/* Look up hook by name */
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hook_p
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ng_ipfw_findhook(node_p node, const char *name)
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{
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u_int16_t n; /* numeric representation of hook */
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char *endptr;
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n = (u_int16_t)strtol(name, &endptr, 10);
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if (*endptr != '\0')
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return NULL;
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return ng_ipfw_findhook1(node, n);
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}
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/* Look up hook by rule number */
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static hook_p
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ng_ipfw_findhook1(node_p node, u_int16_t rulenum)
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{
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hook_p hook;
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hpriv_p hpriv;
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LIST_FOREACH(hook, &node->nd_hooks, hk_hooks) {
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hpriv = NG_HOOK_PRIVATE(hook);
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if (NG_HOOK_IS_VALID(hook) && (hpriv->rulenum == rulenum))
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return (hook);
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}
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return (NULL);
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}
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static int
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ng_ipfw_rcvdata(hook_p hook, item_p item)
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{
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struct m_tag *tag;
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struct ipfw_rule_ref *r;
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struct mbuf *m;
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struct ip *ip;
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NGI_GET_M(item, m);
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NG_FREE_ITEM(item);
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tag = m_tag_locate(m, MTAG_IPFW_RULE, 0, NULL);
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if (tag == NULL) {
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NG_FREE_M(m);
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return (EINVAL); /* XXX: find smth better */
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};
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if (m->m_len < sizeof(struct ip) &&
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(m = m_pullup(m, sizeof(struct ip))) == NULL)
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return (ENOBUFS);
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ip = mtod(m, struct ip *);
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r = (struct ipfw_rule_ref *)(tag + 1);
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if (r->info & IPFW_INFO_IN) {
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switch (ip->ip_v) {
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#ifdef INET
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case IPVERSION:
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ip_input(m);
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return (0);
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#endif
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#ifdef INET6
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case IPV6_VERSION >> 4:
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ip6_input(m);
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return (0);
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#endif
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}
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} else {
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switch (ip->ip_v) {
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#ifdef INET
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case IPVERSION:
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SET_HOST_IPLEN(ip);
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return (ip_output(m, NULL, NULL, IP_FORWARDING,
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NULL, NULL));
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#endif
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#ifdef INET6
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case IPV6_VERSION >> 4:
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return (ip6_output(m, NULL, NULL, 0, NULL,
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NULL, NULL));
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#endif
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}
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}
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/* unknown IP protocol version */
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NG_FREE_M(m);
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return (EPROTONOSUPPORT);
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}
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static int
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ng_ipfw_input(struct mbuf **m0, int dir, struct ip_fw_args *fwa, int tee)
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{
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struct mbuf *m;
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struct ip *ip;
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hook_p hook;
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int error = 0;
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/*
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* Node must be loaded and corresponding hook must be present.
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*/
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if (fw_node == NULL ||
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(hook = ng_ipfw_findhook1(fw_node, fwa->rule.info)) == NULL)
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return (ESRCH); /* no hook associated with this rule */
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/*
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* We have two modes: in normal mode we add a tag to packet, which is
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* important to return packet back to IP stack. In tee mode we make
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* a copy of a packet and forward it into netgraph without a tag.
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*/
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if (tee == 0) {
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struct m_tag *tag;
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struct ipfw_rule_ref *r;
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m = *m0;
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*m0 = NULL; /* it belongs now to netgraph */
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tag = m_tag_alloc(MTAG_IPFW_RULE, 0, sizeof(*r),
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M_NOWAIT|M_ZERO);
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if (tag == NULL) {
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m_freem(m);
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return (ENOMEM);
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}
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r = (struct ipfw_rule_ref *)(tag + 1);
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*r = fwa->rule;
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r->info &= IPFW_ONEPASS; /* keep this info */
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r->info |= dir ? IPFW_INFO_IN : IPFW_INFO_OUT;
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m_tag_prepend(m, tag);
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} else
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if ((m = m_dup(*m0, M_DONTWAIT)) == NULL)
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return (ENOMEM); /* which is ignored */
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if (m->m_len < sizeof(struct ip) &&
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(m = m_pullup(m, sizeof(struct ip))) == NULL)
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return (EINVAL);
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ip = mtod(m, struct ip *);
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NG_SEND_DATA_ONLY(error, hook, m);
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return (error);
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}
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static int
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ng_ipfw_shutdown(node_p node)
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{
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/*
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* After our single node has been removed,
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* the only thing that can be done is
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* 'kldunload ng_ipfw.ko'
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*/
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ng_ipfw_input_p = NULL;
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NG_NODE_UNREF(node);
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return (0);
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}
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static int
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ng_ipfw_disconnect(hook_p hook)
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{
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const hpriv_p hpriv = NG_HOOK_PRIVATE(hook);
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free(hpriv, M_NETGRAPH);
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NG_HOOK_SET_PRIVATE(hook, NULL);
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return (0);
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}
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