3e288e6238
DPCPU_DEFINE and VNET_DEFINE macros, as these cause problems for various people working on the affected files. A better long-term solution is still being considered. This reversal may give some modules empty set_pcpu or set_vnet sections, but these are harmless. Changes reverted: ------------------------------------------------------------------------ r215318 | dim | 2010-11-14 21:40:55 +0100 (Sun, 14 Nov 2010) | 4 lines Instead of unconditionally emitting .globl's for the __start_set_xxx and __stop_set_xxx symbols, only emit them when the set_vnet or set_pcpu sections are actually defined. ------------------------------------------------------------------------ r215317 | dim | 2010-11-14 21:38:11 +0100 (Sun, 14 Nov 2010) | 3 lines Apply the STATIC_VNET_DEFINE and STATIC_DPCPU_DEFINE macros throughout the tree. ------------------------------------------------------------------------ r215316 | dim | 2010-11-14 21:23:02 +0100 (Sun, 14 Nov 2010) | 2 lines Add macros to define static instances of VNET_DEFINE and DPCPU_DEFINE.
605 lines
15 KiB
C
605 lines
15 KiB
C
/*-
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* Copyright (c) 2008 Paolo Pisati
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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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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/systm.h>
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#include <sys/eventhandler.h>
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#include <sys/malloc.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/module.h>
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#include <sys/rwlock.h>
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#define IPFW_INTERNAL /* Access to protected data structures in ip_fw.h. */
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#include <netinet/libalias/alias.h>
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#include <netinet/libalias/alias_local.h>
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#include <net/if.h>
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#include <netinet/in.h>
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#include <netinet/ip.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/tcp.h>
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#include <netinet/udp.h>
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#include <machine/in_cksum.h> /* XXX for in_cksum */
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static VNET_DEFINE(eventhandler_tag, ifaddr_event_tag);
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#define V_ifaddr_event_tag VNET(ifaddr_event_tag)
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static void
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ifaddr_change(void *arg __unused, struct ifnet *ifp)
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{
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struct cfg_nat *ptr;
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struct ifaddr *ifa;
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struct ip_fw_chain *chain;
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chain = &V_layer3_chain;
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IPFW_WLOCK(chain);
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/* Check every nat entry... */
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LIST_FOREACH(ptr, &chain->nat, _next) {
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/* ...using nic 'ifp->if_xname' as dynamic alias address. */
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if (strncmp(ptr->if_name, ifp->if_xname, IF_NAMESIZE) != 0)
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continue;
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if_addr_rlock(ifp);
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TAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (ifa->ifa_addr == NULL)
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continue;
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if (ifa->ifa_addr->sa_family != AF_INET)
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continue;
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ptr->ip = ((struct sockaddr_in *)
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(ifa->ifa_addr))->sin_addr;
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LibAliasSetAddress(ptr->lib, ptr->ip);
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}
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if_addr_runlock(ifp);
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}
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IPFW_WUNLOCK(chain);
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}
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/*
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* delete the pointers for nat entry ix, or all of them if ix < 0
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*/
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static void
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flush_nat_ptrs(struct ip_fw_chain *chain, const int ix)
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{
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int i;
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ipfw_insn_nat *cmd;
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IPFW_WLOCK_ASSERT(chain);
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for (i = 0; i < chain->n_rules; i++) {
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cmd = (ipfw_insn_nat *)ACTION_PTR(chain->map[i]);
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/* XXX skip log and the like ? */
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if (cmd->o.opcode == O_NAT && cmd->nat != NULL &&
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(ix < 0 || cmd->nat->id == ix))
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cmd->nat = NULL;
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}
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}
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static void
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del_redir_spool_cfg(struct cfg_nat *n, struct redir_chain *head)
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{
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struct cfg_redir *r, *tmp_r;
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struct cfg_spool *s, *tmp_s;
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int i, num;
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LIST_FOREACH_SAFE(r, head, _next, tmp_r) {
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num = 1; /* Number of alias_link to delete. */
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switch (r->mode) {
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case REDIR_PORT:
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num = r->pport_cnt;
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/* FALLTHROUGH */
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case REDIR_ADDR:
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case REDIR_PROTO:
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/* Delete all libalias redirect entry. */
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for (i = 0; i < num; i++)
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LibAliasRedirectDelete(n->lib, r->alink[i]);
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/* Del spool cfg if any. */
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LIST_FOREACH_SAFE(s, &r->spool_chain, _next, tmp_s) {
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LIST_REMOVE(s, _next);
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free(s, M_IPFW);
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}
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free(r->alink, M_IPFW);
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LIST_REMOVE(r, _next);
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free(r, M_IPFW);
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break;
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default:
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printf("unknown redirect mode: %u\n", r->mode);
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/* XXX - panic?!?!? */
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break;
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}
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}
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}
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static int
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add_redir_spool_cfg(char *buf, struct cfg_nat *ptr)
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{
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struct cfg_redir *r, *ser_r;
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struct cfg_spool *s, *ser_s;
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int cnt, off, i;
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for (cnt = 0, off = 0; cnt < ptr->redir_cnt; cnt++) {
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ser_r = (struct cfg_redir *)&buf[off];
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r = malloc(SOF_REDIR, M_IPFW, M_WAITOK | M_ZERO);
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memcpy(r, ser_r, SOF_REDIR);
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LIST_INIT(&r->spool_chain);
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off += SOF_REDIR;
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r->alink = malloc(sizeof(struct alias_link *) * r->pport_cnt,
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M_IPFW, M_WAITOK | M_ZERO);
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switch (r->mode) {
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case REDIR_ADDR:
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r->alink[0] = LibAliasRedirectAddr(ptr->lib, r->laddr,
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r->paddr);
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break;
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case REDIR_PORT:
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for (i = 0 ; i < r->pport_cnt; i++) {
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/* If remotePort is all ports, set it to 0. */
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u_short remotePortCopy = r->rport + i;
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if (r->rport_cnt == 1 && r->rport == 0)
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remotePortCopy = 0;
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r->alink[i] = LibAliasRedirectPort(ptr->lib,
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r->laddr, htons(r->lport + i), r->raddr,
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htons(remotePortCopy), r->paddr,
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htons(r->pport + i), r->proto);
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if (r->alink[i] == NULL) {
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r->alink[0] = NULL;
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break;
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}
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}
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break;
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case REDIR_PROTO:
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r->alink[0] = LibAliasRedirectProto(ptr->lib ,r->laddr,
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r->raddr, r->paddr, r->proto);
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break;
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default:
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printf("unknown redirect mode: %u\n", r->mode);
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break;
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}
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/* XXX perhaps return an error instead of panic ? */
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if (r->alink[0] == NULL)
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panic("LibAliasRedirect* returned NULL");
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/* LSNAT handling. */
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for (i = 0; i < r->spool_cnt; i++) {
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ser_s = (struct cfg_spool *)&buf[off];
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s = malloc(SOF_REDIR, M_IPFW, M_WAITOK | M_ZERO);
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memcpy(s, ser_s, SOF_SPOOL);
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LibAliasAddServer(ptr->lib, r->alink[0],
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s->addr, htons(s->port));
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off += SOF_SPOOL;
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/* Hook spool entry. */
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LIST_INSERT_HEAD(&r->spool_chain, s, _next);
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}
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/* And finally hook this redir entry. */
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LIST_INSERT_HEAD(&ptr->redir_chain, r, _next);
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}
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return (1);
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}
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static int
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ipfw_nat(struct ip_fw_args *args, struct cfg_nat *t, struct mbuf *m)
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{
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struct mbuf *mcl;
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struct ip *ip;
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/* XXX - libalias duct tape */
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int ldt, retval;
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char *c;
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ldt = 0;
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retval = 0;
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mcl = m_megapullup(m, m->m_pkthdr.len);
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if (mcl == NULL) {
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args->m = NULL;
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return (IP_FW_DENY);
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}
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ip = mtod(mcl, struct ip *);
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/*
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* XXX - Libalias checksum offload 'duct tape':
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*
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* locally generated packets have only pseudo-header checksum
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* calculated and libalias will break it[1], so mark them for
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* later fix. Moreover there are cases when libalias modifies
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* tcp packet data[2], mark them for later fix too.
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*
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* [1] libalias was never meant to run in kernel, so it does
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* not have any knowledge about checksum offloading, and
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* expects a packet with a full internet checksum.
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* Unfortunately, packets generated locally will have just the
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* pseudo header calculated, and when libalias tries to adjust
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* the checksum it will actually compute a wrong value.
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*
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* [2] when libalias modifies tcp's data content, full TCP
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* checksum has to be recomputed: the problem is that
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* libalias does not have any idea about checksum offloading.
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* To work around this, we do not do checksumming in LibAlias,
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* but only mark the packets in th_x2 field. If we receive a
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* marked packet, we calculate correct checksum for it
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* aware of offloading. Why such a terrible hack instead of
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* recalculating checksum for each packet?
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* Because the previous checksum was not checked!
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* Recalculating checksums for EVERY packet will hide ALL
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* transmission errors. Yes, marked packets still suffer from
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* this problem. But, sigh, natd(8) has this problem, too.
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*
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* TODO: -make libalias mbuf aware (so
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* it can handle delayed checksum and tso)
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*/
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if (mcl->m_pkthdr.rcvif == NULL &&
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mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA)
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ldt = 1;
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c = mtod(mcl, char *);
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if (args->oif == NULL)
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retval = LibAliasIn(t->lib, c,
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mcl->m_len + M_TRAILINGSPACE(mcl));
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else
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retval = LibAliasOut(t->lib, c,
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mcl->m_len + M_TRAILINGSPACE(mcl));
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if (retval == PKT_ALIAS_RESPOND) {
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m->m_flags |= M_SKIP_FIREWALL;
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retval = PKT_ALIAS_OK;
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}
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if (retval != PKT_ALIAS_OK &&
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retval != PKT_ALIAS_FOUND_HEADER_FRAGMENT) {
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/* XXX - should i add some logging? */
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m_free(mcl);
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args->m = NULL;
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return (IP_FW_DENY);
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}
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mcl->m_pkthdr.len = mcl->m_len = ntohs(ip->ip_len);
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/*
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* XXX - libalias checksum offload
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* 'duct tape' (see above)
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*/
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if ((ip->ip_off & htons(IP_OFFMASK)) == 0 &&
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ip->ip_p == IPPROTO_TCP) {
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struct tcphdr *th;
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th = (struct tcphdr *)(ip + 1);
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if (th->th_x2)
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ldt = 1;
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}
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if (ldt) {
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struct tcphdr *th;
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struct udphdr *uh;
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u_short cksum;
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ip->ip_len = ntohs(ip->ip_len);
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cksum = in_pseudo(ip->ip_src.s_addr, ip->ip_dst.s_addr,
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htons(ip->ip_p + ip->ip_len - (ip->ip_hl << 2)));
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switch (ip->ip_p) {
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case IPPROTO_TCP:
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th = (struct tcphdr *)(ip + 1);
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/*
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* Maybe it was set in
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* libalias...
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*/
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th->th_x2 = 0;
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th->th_sum = cksum;
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mcl->m_pkthdr.csum_data =
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offsetof(struct tcphdr, th_sum);
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break;
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case IPPROTO_UDP:
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uh = (struct udphdr *)(ip + 1);
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uh->uh_sum = cksum;
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mcl->m_pkthdr.csum_data =
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offsetof(struct udphdr, uh_sum);
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break;
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}
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/* No hw checksum offloading: do it ourselves */
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if ((mcl->m_pkthdr.csum_flags & CSUM_DELAY_DATA) == 0) {
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in_delayed_cksum(mcl);
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mcl->m_pkthdr.csum_flags &= ~CSUM_DELAY_DATA;
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}
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ip->ip_len = htons(ip->ip_len);
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}
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args->m = mcl;
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return (IP_FW_NAT);
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}
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static struct cfg_nat *
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lookup_nat(struct nat_list *l, int nat_id)
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{
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struct cfg_nat *res;
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LIST_FOREACH(res, l, _next) {
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if (res->id == nat_id)
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break;
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}
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return res;
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}
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static int
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ipfw_nat_cfg(struct sockopt *sopt)
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{
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struct cfg_nat *ptr, *ser_n;
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char *buf;
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struct ip_fw_chain *chain = &V_layer3_chain;
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buf = malloc(NAT_BUF_LEN, M_IPFW, M_WAITOK | M_ZERO);
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sooptcopyin(sopt, buf, NAT_BUF_LEN, sizeof(struct cfg_nat));
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ser_n = (struct cfg_nat *)buf;
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/* check valid parameter ser_n->id > 0 ? */
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/*
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* Find/create nat rule.
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*/
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IPFW_WLOCK(chain);
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ptr = lookup_nat(&chain->nat, ser_n->id);
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if (ptr == NULL) {
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/* New rule: allocate and init new instance. */
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ptr = malloc(sizeof(struct cfg_nat),
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M_IPFW, M_NOWAIT | M_ZERO);
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if (ptr == NULL) {
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IPFW_WUNLOCK(chain);
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free(buf, M_IPFW);
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return (ENOSPC);
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}
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ptr->lib = LibAliasInit(NULL);
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if (ptr->lib == NULL) {
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IPFW_WUNLOCK(chain);
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free(ptr, M_IPFW);
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free(buf, M_IPFW);
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return (EINVAL);
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}
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LIST_INIT(&ptr->redir_chain);
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} else {
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/* Entry already present: temporarly unhook it. */
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LIST_REMOVE(ptr, _next);
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flush_nat_ptrs(chain, ser_n->id);
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}
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IPFW_WUNLOCK(chain);
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/*
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* Basic nat configuration.
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*/
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ptr->id = ser_n->id;
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/*
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* XXX - what if this rule doesn't nat any ip and just
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* redirect?
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* do we set aliasaddress to 0.0.0.0?
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*/
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ptr->ip = ser_n->ip;
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ptr->redir_cnt = ser_n->redir_cnt;
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ptr->mode = ser_n->mode;
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LibAliasSetMode(ptr->lib, ser_n->mode, ser_n->mode);
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LibAliasSetAddress(ptr->lib, ptr->ip);
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memcpy(ptr->if_name, ser_n->if_name, IF_NAMESIZE);
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/*
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* Redir and LSNAT configuration.
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*/
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/* Delete old cfgs. */
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del_redir_spool_cfg(ptr, &ptr->redir_chain);
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/* Add new entries. */
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add_redir_spool_cfg(&buf[(sizeof(struct cfg_nat))], ptr);
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free(buf, M_IPFW);
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IPFW_WLOCK(chain);
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LIST_INSERT_HEAD(&chain->nat, ptr, _next);
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IPFW_WUNLOCK(chain);
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return (0);
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}
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static int
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ipfw_nat_del(struct sockopt *sopt)
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{
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struct cfg_nat *ptr;
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struct ip_fw_chain *chain = &V_layer3_chain;
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int i;
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sooptcopyin(sopt, &i, sizeof i, sizeof i);
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/* XXX validate i */
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IPFW_WLOCK(chain);
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ptr = lookup_nat(&chain->nat, i);
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if (ptr == NULL) {
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IPFW_WUNLOCK(chain);
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return (EINVAL);
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}
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LIST_REMOVE(ptr, _next);
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flush_nat_ptrs(chain, i);
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IPFW_WUNLOCK(chain);
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del_redir_spool_cfg(ptr, &ptr->redir_chain);
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LibAliasUninit(ptr->lib);
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free(ptr, M_IPFW);
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return (0);
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}
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static int
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ipfw_nat_get_cfg(struct sockopt *sopt)
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{
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uint8_t *data;
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struct cfg_nat *n;
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struct cfg_redir *r;
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struct cfg_spool *s;
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int nat_cnt, off;
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struct ip_fw_chain *chain;
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int err = ENOSPC;
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chain = &V_layer3_chain;
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nat_cnt = 0;
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off = sizeof(nat_cnt);
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data = malloc(NAT_BUF_LEN, M_IPFW, M_WAITOK | M_ZERO);
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IPFW_RLOCK(chain);
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/* Serialize all the data. */
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LIST_FOREACH(n, &chain->nat, _next) {
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nat_cnt++;
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if (off + SOF_NAT >= NAT_BUF_LEN)
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goto nospace;
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bcopy(n, &data[off], SOF_NAT);
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off += SOF_NAT;
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LIST_FOREACH(r, &n->redir_chain, _next) {
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if (off + SOF_REDIR >= NAT_BUF_LEN)
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goto nospace;
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bcopy(r, &data[off], SOF_REDIR);
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off += SOF_REDIR;
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LIST_FOREACH(s, &r->spool_chain, _next) {
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if (off + SOF_SPOOL >= NAT_BUF_LEN)
|
|
goto nospace;
|
|
bcopy(s, &data[off], SOF_SPOOL);
|
|
off += SOF_SPOOL;
|
|
}
|
|
}
|
|
}
|
|
err = 0; /* all good */
|
|
nospace:
|
|
IPFW_RUNLOCK(chain);
|
|
if (err == 0) {
|
|
bcopy(&nat_cnt, data, sizeof(nat_cnt));
|
|
sooptcopyout(sopt, data, NAT_BUF_LEN);
|
|
} else {
|
|
printf("serialized data buffer not big enough:"
|
|
"please increase NAT_BUF_LEN\n");
|
|
}
|
|
free(data, M_IPFW);
|
|
return (err);
|
|
}
|
|
|
|
static int
|
|
ipfw_nat_get_log(struct sockopt *sopt)
|
|
{
|
|
uint8_t *data;
|
|
struct cfg_nat *ptr;
|
|
int i, size;
|
|
struct ip_fw_chain *chain;
|
|
|
|
chain = &V_layer3_chain;
|
|
|
|
IPFW_RLOCK(chain);
|
|
/* one pass to count, one to copy the data */
|
|
i = 0;
|
|
LIST_FOREACH(ptr, &chain->nat, _next) {
|
|
if (ptr->lib->logDesc == NULL)
|
|
continue;
|
|
i++;
|
|
}
|
|
size = i * (LIBALIAS_BUF_SIZE + sizeof(int));
|
|
data = malloc(size, M_IPFW, M_NOWAIT | M_ZERO);
|
|
if (data == NULL) {
|
|
IPFW_RUNLOCK(chain);
|
|
return (ENOSPC);
|
|
}
|
|
i = 0;
|
|
LIST_FOREACH(ptr, &chain->nat, _next) {
|
|
if (ptr->lib->logDesc == NULL)
|
|
continue;
|
|
bcopy(&ptr->id, &data[i], sizeof(int));
|
|
i += sizeof(int);
|
|
bcopy(ptr->lib->logDesc, &data[i], LIBALIAS_BUF_SIZE);
|
|
i += LIBALIAS_BUF_SIZE;
|
|
}
|
|
IPFW_RUNLOCK(chain);
|
|
sooptcopyout(sopt, data, size);
|
|
free(data, M_IPFW);
|
|
return(0);
|
|
}
|
|
|
|
static void
|
|
ipfw_nat_init(void)
|
|
{
|
|
|
|
IPFW_WLOCK(&V_layer3_chain);
|
|
/* init ipfw hooks */
|
|
ipfw_nat_ptr = ipfw_nat;
|
|
lookup_nat_ptr = lookup_nat;
|
|
ipfw_nat_cfg_ptr = ipfw_nat_cfg;
|
|
ipfw_nat_del_ptr = ipfw_nat_del;
|
|
ipfw_nat_get_cfg_ptr = ipfw_nat_get_cfg;
|
|
ipfw_nat_get_log_ptr = ipfw_nat_get_log;
|
|
IPFW_WUNLOCK(&V_layer3_chain);
|
|
V_ifaddr_event_tag = EVENTHANDLER_REGISTER(
|
|
ifaddr_event, ifaddr_change,
|
|
NULL, EVENTHANDLER_PRI_ANY);
|
|
}
|
|
|
|
static void
|
|
ipfw_nat_destroy(void)
|
|
{
|
|
struct cfg_nat *ptr, *ptr_temp;
|
|
struct ip_fw_chain *chain;
|
|
|
|
chain = &V_layer3_chain;
|
|
IPFW_WLOCK(chain);
|
|
LIST_FOREACH_SAFE(ptr, &chain->nat, _next, ptr_temp) {
|
|
LIST_REMOVE(ptr, _next);
|
|
del_redir_spool_cfg(ptr, &ptr->redir_chain);
|
|
LibAliasUninit(ptr->lib);
|
|
free(ptr, M_IPFW);
|
|
}
|
|
EVENTHANDLER_DEREGISTER(ifaddr_event, V_ifaddr_event_tag);
|
|
flush_nat_ptrs(chain, -1 /* flush all */);
|
|
/* deregister ipfw_nat */
|
|
ipfw_nat_ptr = NULL;
|
|
lookup_nat_ptr = NULL;
|
|
ipfw_nat_cfg_ptr = NULL;
|
|
ipfw_nat_del_ptr = NULL;
|
|
ipfw_nat_get_cfg_ptr = NULL;
|
|
ipfw_nat_get_log_ptr = NULL;
|
|
IPFW_WUNLOCK(chain);
|
|
}
|
|
|
|
static int
|
|
ipfw_nat_modevent(module_t mod, int type, void *unused)
|
|
{
|
|
int err = 0;
|
|
|
|
switch (type) {
|
|
case MOD_LOAD:
|
|
ipfw_nat_init();
|
|
break;
|
|
|
|
case MOD_UNLOAD:
|
|
ipfw_nat_destroy();
|
|
break;
|
|
|
|
default:
|
|
return EOPNOTSUPP;
|
|
break;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
static moduledata_t ipfw_nat_mod = {
|
|
"ipfw_nat",
|
|
ipfw_nat_modevent,
|
|
0
|
|
};
|
|
|
|
DECLARE_MODULE(ipfw_nat, ipfw_nat_mod, SI_SUB_PROTO_IFATTACHDOMAIN, SI_ORDER_ANY);
|
|
MODULE_DEPEND(ipfw_nat, libalias, 1, 1, 1);
|
|
MODULE_DEPEND(ipfw_nat, ipfw, 2, 2, 2);
|
|
MODULE_VERSION(ipfw_nat, 1);
|
|
/* end of file */
|