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Diffstat (limited to 'sys/netinet/ipfw/ip_fw_pfil.c')
-rw-r--r--sys/netinet/ipfw/ip_fw_pfil.c588
1 files changed, 0 insertions, 588 deletions
diff --git a/sys/netinet/ipfw/ip_fw_pfil.c b/sys/netinet/ipfw/ip_fw_pfil.c
deleted file mode 100644
index 8d429e7..0000000
--- a/sys/netinet/ipfw/ip_fw_pfil.c
+++ /dev/null
@@ -1,588 +0,0 @@
-/*-
- * Copyright (c) 2004 Andre Oppermann, Internet Business Solutions AG
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in the
- * documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
- * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
- * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
- * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
- * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
- * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
- * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
- * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
- * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- */
-
-#include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
-
-#include "opt_ipfw.h"
-#include "opt_inet.h"
-#include "opt_inet6.h"
-#ifndef INET
-#error IPFIREWALL requires INET.
-#endif /* INET */
-
-#include <sys/param.h>
-#include <sys/systm.h>
-#include <sys/malloc.h>
-#include <sys/mbuf.h>
-#include <sys/module.h>
-#include <sys/kernel.h>
-#include <sys/lock.h>
-#include <sys/rwlock.h>
-#include <sys/socket.h>
-#include <sys/sysctl.h>
-
-#include <net/if.h>
-#include <net/route.h>
-#include <net/ethernet.h>
-#include <net/pfil.h>
-#include <net/vnet.h>
-
-#include <netinet/in.h>
-#include <netinet/in_systm.h>
-#include <netinet/ip.h>
-#include <netinet/ip_var.h>
-#include <netinet/ip_fw.h>
-#ifdef INET6
-#include <netinet/ip6.h>
-#include <netinet6/ip6_var.h>
-#endif
-#include <netinet/ipfw/ip_fw_private.h>
-#include <netgraph/ng_ipfw.h>
-
-#include <machine/in_cksum.h>
-
-static VNET_DEFINE(int, fw_enable) = 1;
-#define V_fw_enable VNET(fw_enable)
-
-#ifdef INET6
-static VNET_DEFINE(int, fw6_enable) = 1;
-#define V_fw6_enable VNET(fw6_enable)
-#endif
-
-static VNET_DEFINE(int, fwlink_enable) = 0;
-#define V_fwlink_enable VNET(fwlink_enable)
-
-int ipfw_chg_hook(SYSCTL_HANDLER_ARGS);
-
-/* Forward declarations. */
-static int ipfw_divert(struct mbuf **, int, struct ipfw_rule_ref *, int);
-static int ipfw_check_packet(void *, struct mbuf **, struct ifnet *, int,
- struct inpcb *);
-static int ipfw_check_frame(void *, struct mbuf **, struct ifnet *, int,
- struct inpcb *);
-
-#ifdef SYSCTL_NODE
-
-SYSBEGIN(f1)
-
-SYSCTL_DECL(_net_inet_ip_fw);
-SYSCTL_VNET_PROC(_net_inet_ip_fw, OID_AUTO, enable,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE3, &VNET_NAME(fw_enable), 0,
- ipfw_chg_hook, "I", "Enable ipfw");
-#ifdef INET6
-SYSCTL_DECL(_net_inet6_ip6_fw);
-SYSCTL_VNET_PROC(_net_inet6_ip6_fw, OID_AUTO, enable,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE3, &VNET_NAME(fw6_enable), 0,
- ipfw_chg_hook, "I", "Enable ipfw+6");
-#endif /* INET6 */
-
-SYSCTL_DECL(_net_link_ether);
-SYSCTL_VNET_PROC(_net_link_ether, OID_AUTO, ipfw,
- CTLTYPE_INT | CTLFLAG_RW | CTLFLAG_SECURE3, &VNET_NAME(fwlink_enable), 0,
- ipfw_chg_hook, "I", "Pass ether pkts through firewall");
-
-SYSEND
-
-#endif /* SYSCTL_NODE */
-
-/*
- * The pfilter hook to pass packets to ipfw_chk and then to
- * dummynet, divert, netgraph or other modules.
- * The packet may be consumed.
- */
-static int
-ipfw_check_packet(void *arg, struct mbuf **m0, struct ifnet *ifp, int dir,
- struct inpcb *inp)
-{
- struct ip_fw_args args;
- struct m_tag *tag;
- int ipfw;
- int ret;
-
- /* all the processing now uses ip_len in net format */
- if (mtod(*m0, struct ip *)->ip_v == 4)
- SET_NET_IPLEN(mtod(*m0, struct ip *));
-
- /* convert dir to IPFW values */
- dir = (dir == PFIL_IN) ? DIR_IN : DIR_OUT;
- bzero(&args, sizeof(args));
-
-again:
- /*
- * extract and remove the tag if present. If we are left
- * with onepass, optimize the outgoing path.
- */
- tag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
- if (tag != NULL) {
- args.rule = *((struct ipfw_rule_ref *)(tag+1));
- m_tag_delete(*m0, tag);
- if (args.rule.info & IPFW_ONEPASS) {
- if (mtod(*m0, struct ip *)->ip_v == 4)
- SET_HOST_IPLEN(mtod(*m0, struct ip *));
- return (0);
- }
- }
-
- args.m = *m0;
- args.oif = dir == DIR_OUT ? ifp : NULL;
- args.inp = inp;
-
- ipfw = ipfw_chk(&args);
- *m0 = args.m;
-
- KASSERT(*m0 != NULL || ipfw == IP_FW_DENY, ("%s: m0 is NULL",
- __func__));
-
- /* breaking out of the switch means drop */
- ret = 0; /* default return value for pass */
- switch (ipfw) {
- case IP_FW_PASS:
- /* next_hop may be set by ipfw_chk */
- if (args.next_hop == NULL && args.next_hop6 == NULL)
- break; /* pass */
-#if !defined(IPFIREWALL_FORWARD) || (!defined(INET6) && !defined(INET))
- ret = EACCES;
-#else
- {
- struct m_tag *fwd_tag;
- size_t len;
-
- KASSERT(args.next_hop == NULL || args.next_hop6 == NULL,
- ("%s: both next_hop=%p and next_hop6=%p not NULL", __func__,
- args.next_hop, args.next_hop6));
-#ifdef INET6
- if (args.next_hop6 != NULL)
- len = sizeof(struct sockaddr_in6);
-#endif
-#ifdef INET
- if (args.next_hop != NULL)
- len = sizeof(struct sockaddr_in);
-#endif
-
- /* Incoming packets should not be tagged so we do not
- * m_tag_find. Outgoing packets may be tagged, so we
- * reuse the tag if present.
- */
- fwd_tag = (dir == DIR_IN) ? NULL :
- m_tag_find(*m0, PACKET_TAG_IPFORWARD, NULL);
- if (fwd_tag != NULL) {
- m_tag_unlink(*m0, fwd_tag);
- } else {
- fwd_tag = m_tag_get(PACKET_TAG_IPFORWARD, len,
- M_NOWAIT);
- if (fwd_tag == NULL) {
- ret = EACCES;
- break; /* i.e. drop */
- }
- }
-#ifdef INET6
- if (args.next_hop6 != NULL) {
- bcopy(args.next_hop6, (fwd_tag+1), len);
- if (in6_localip(&args.next_hop6->sin6_addr))
- (*m0)->m_flags |= M_FASTFWD_OURS;
- }
-#endif
-#ifdef INET
- if (args.next_hop != NULL) {
- bcopy(args.next_hop, (fwd_tag+1), len);
- if (in_localip(args.next_hop->sin_addr))
- (*m0)->m_flags |= M_FASTFWD_OURS;
- }
-#endif
- m_tag_prepend(*m0, fwd_tag);
- }
-#endif /* IPFIREWALL_FORWARD */
- break;
-
- case IP_FW_DENY:
- ret = EACCES;
- break; /* i.e. drop */
-
- case IP_FW_DUMMYNET:
- ret = EACCES;
- if (ip_dn_io_ptr == NULL)
- break; /* i.e. drop */
- if (mtod(*m0, struct ip *)->ip_v == 4)
- ret = ip_dn_io_ptr(m0, dir, &args);
- else if (mtod(*m0, struct ip *)->ip_v == 6)
- ret = ip_dn_io_ptr(m0, dir | PROTO_IPV6, &args);
- else
- break; /* drop it */
- /*
- * XXX should read the return value.
- * dummynet normally eats the packet and sets *m0=NULL
- * unless the packet can be sent immediately. In this
- * case args is updated and we should re-run the
- * check without clearing args.
- */
- if (*m0 != NULL)
- goto again;
- break;
-
- case IP_FW_TEE:
- case IP_FW_DIVERT:
- if (ip_divert_ptr == NULL) {
- ret = EACCES;
- break; /* i.e. drop */
- }
- ret = ipfw_divert(m0, dir, &args.rule,
- (ipfw == IP_FW_TEE) ? 1 : 0);
- /* continue processing for the original packet (tee). */
- if (*m0)
- goto again;
- break;
-
- case IP_FW_NGTEE:
- case IP_FW_NETGRAPH:
- if (ng_ipfw_input_p == NULL) {
- ret = EACCES;
- break; /* i.e. drop */
- }
- ret = ng_ipfw_input_p(m0, dir, &args,
- (ipfw == IP_FW_NGTEE) ? 1 : 0);
- if (ipfw == IP_FW_NGTEE) /* ignore errors for NGTEE */
- goto again; /* continue with packet */
- break;
-
- case IP_FW_NAT:
- /* honor one-pass in case of successful nat */
- if (V_fw_one_pass)
- break; /* ret is already 0 */
- goto again;
-
- case IP_FW_REASS:
- goto again; /* continue with packet */
-
- default:
- KASSERT(0, ("%s: unknown retval", __func__));
- }
-
- if (ret != 0) {
- if (*m0)
- FREE_PKT(*m0);
- *m0 = NULL;
- }
- if (*m0 && mtod(*m0, struct ip *)->ip_v == 4)
- SET_HOST_IPLEN(mtod(*m0, struct ip *));
- return ret;
-}
-
-/*
- * ipfw processing for ethernet packets (in and out).
- * Inteface is NULL from ether_demux, and ifp from
- * ether_output_frame.
- */
-static int
-ipfw_check_frame(void *arg, struct mbuf **m0, struct ifnet *dst, int dir,
- struct inpcb *inp)
-{
- struct ether_header *eh;
- struct ether_header save_eh;
- struct mbuf *m;
- int i, ret;
- struct ip_fw_args args;
- struct m_tag *mtag;
-
- /* fetch start point from rule, if any */
- mtag = m_tag_locate(*m0, MTAG_IPFW_RULE, 0, NULL);
- if (mtag == NULL) {
- args.rule.slot = 0;
- } else {
- /* dummynet packet, already partially processed */
- struct ipfw_rule_ref *r;
-
- /* XXX can we free it after use ? */
- mtag->m_tag_id = PACKET_TAG_NONE;
- r = (struct ipfw_rule_ref *)(mtag + 1);
- if (r->info & IPFW_ONEPASS)
- return (0);
- args.rule = *r;
- }
-
- /* I need some amt of data to be contiguous */
- m = *m0;
- i = min(m->m_pkthdr.len, max_protohdr);
- if (m->m_len < i) {
- m = m_pullup(m, i);
- if (m == NULL) {
- *m0 = m;
- return (0);
- }
- }
- eh = mtod(m, struct ether_header *);
- save_eh = *eh; /* save copy for restore below */
- m_adj(m, ETHER_HDR_LEN); /* strip ethernet header */
-
- args.m = m; /* the packet we are looking at */
- args.oif = dst; /* destination, if any */
- args.next_hop = NULL; /* we do not support forward yet */
- args.next_hop6 = NULL; /* we do not support forward yet */
- args.eh = &save_eh; /* MAC header for bridged/MAC packets */
- args.inp = NULL; /* used by ipfw uid/gid/jail rules */
- i = ipfw_chk(&args);
- m = args.m;
- if (m != NULL) {
- /*
- * Restore Ethernet header, as needed, in case the
- * mbuf chain was replaced by ipfw.
- */
- M_PREPEND(m, ETHER_HDR_LEN, M_DONTWAIT);
- if (m == NULL) {
- *m0 = NULL;
- return (0);
- }
- if (eh != mtod(m, struct ether_header *))
- bcopy(&save_eh, mtod(m, struct ether_header *),
- ETHER_HDR_LEN);
- }
- *m0 = m;
-
- ret = 0;
- /* Check result of ipfw_chk() */
- switch (i) {
- case IP_FW_PASS:
- break;
-
- case IP_FW_DENY:
- ret = EACCES;
- break; /* i.e. drop */
-
- case IP_FW_DUMMYNET:
- ret = EACCES;
- int dir;
-
- if (ip_dn_io_ptr == NULL)
- break; /* i.e. drop */
-
- *m0 = NULL;
- dir = PROTO_LAYER2 | (dst ? DIR_OUT : DIR_IN);
- ip_dn_io_ptr(&m, dir, &args);
- return 0;
-
- default:
- KASSERT(0, ("%s: unknown retval", __func__));
- }
-
- if (ret != 0) {
- if (*m0)
- FREE_PKT(*m0);
- *m0 = NULL;
- }
-
- return ret;
-}
-
-/* do the divert, return 1 on error 0 on success */
-static int
-ipfw_divert(struct mbuf **m0, int incoming, struct ipfw_rule_ref *rule,
- int tee)
-{
- /*
- * ipfw_chk() has already tagged the packet with the divert tag.
- * If tee is set, copy packet and return original.
- * If not tee, consume packet and send it to divert socket.
- */
- struct mbuf *clone;
- struct ip *ip = mtod(*m0, struct ip *);
- struct m_tag *tag;
-
- /* Cloning needed for tee? */
- if (tee == 0) {
- clone = *m0; /* use the original mbuf */
- *m0 = NULL;
- } else {
- clone = m_dup(*m0, M_DONTWAIT);
- /* If we cannot duplicate the mbuf, we sacrifice the divert
- * chain and continue with the tee-ed packet.
- */
- if (clone == NULL)
- return 1;
- }
-
- /*
- * Divert listeners can normally handle non-fragmented packets,
- * but we can only reass in the non-tee case.
- * This means that listeners on a tee rule may get fragments,
- * and have to live with that.
- * Note that we now have the 'reass' ipfw option so if we care
- * we can do it before a 'tee'.
- */
- if (!tee) switch (ip->ip_v) {
- case IPVERSION:
- if (ntohs(ip->ip_off) & (IP_MF | IP_OFFMASK)) {
- int hlen;
- struct mbuf *reass;
-
- SET_HOST_IPLEN(ip); /* ip_reass wants host order */
- reass = ip_reass(clone); /* Reassemble packet. */
- if (reass == NULL)
- return 0; /* not an error */
- /* if reass = NULL then it was consumed by ip_reass */
- /*
- * IP header checksum fixup after reassembly and leave header
- * in network byte order.
- */
- ip = mtod(reass, struct ip *);
- hlen = ip->ip_hl << 2;
- SET_NET_IPLEN(ip);
- ip->ip_sum = 0;
- if (hlen == sizeof(struct ip))
- ip->ip_sum = in_cksum_hdr(ip);
- else
- ip->ip_sum = in_cksum(reass, hlen);
- clone = reass;
- }
- break;
-#ifdef INET6
- case IPV6_VERSION >> 4:
- {
- struct ip6_hdr *const ip6 = mtod(clone, struct ip6_hdr *);
-
- if (ip6->ip6_nxt == IPPROTO_FRAGMENT) {
- int nxt, off;
-
- off = sizeof(struct ip6_hdr);
- nxt = frag6_input(&clone, &off, 0);
- if (nxt == IPPROTO_DONE)
- return (0);
- }
- break;
- }
-#endif
- }
-
- /* attach a tag to the packet with the reinject info */
- tag = m_tag_alloc(MTAG_IPFW_RULE, 0,
- sizeof(struct ipfw_rule_ref), M_NOWAIT);
- if (tag == NULL) {
- FREE_PKT(clone);
- return 1;
- }
- *((struct ipfw_rule_ref *)(tag+1)) = *rule;
- m_tag_prepend(clone, tag);
-
- /* Do the dirty job... */
- ip_divert_ptr(clone, incoming);
- return 0;
-}
-
-/*
- * attach or detach hooks for a given protocol family
- */
-static int
-ipfw_hook(int onoff, int pf)
-{
- struct pfil_head *pfh;
- void *hook_func;
-
- pfh = pfil_head_get(PFIL_TYPE_AF, pf);
- if (pfh == NULL)
- return ENOENT;
-
- hook_func = (pf == AF_LINK) ? ipfw_check_frame : ipfw_check_packet;
-
- (void) (onoff ? pfil_add_hook : pfil_remove_hook)
- (hook_func, NULL, PFIL_IN | PFIL_OUT | PFIL_WAITOK, pfh);
-
- return 0;
-}
-
-int
-ipfw_attach_hooks(int arg)
-{
- int error = 0;
-
- if (arg == 0) /* detach */
- ipfw_hook(0, AF_INET);
- else if (V_fw_enable && ipfw_hook(1, AF_INET) != 0) {
- error = ENOENT; /* see ip_fw_pfil.c::ipfw_hook() */
- printf("ipfw_hook() error\n");
- }
-#ifdef INET6
- if (arg == 0) /* detach */
- ipfw_hook(0, AF_INET6);
- else if (V_fw6_enable && ipfw_hook(1, AF_INET6) != 0) {
- error = ENOENT;
- printf("ipfw6_hook() error\n");
- }
-#endif
- if (arg == 0) /* detach */
- ipfw_hook(0, AF_LINK);
- else if (V_fwlink_enable && ipfw_hook(1, AF_LINK) != 0) {
- error = ENOENT;
- printf("ipfw_link_hook() error\n");
- }
- return error;
-}
-
-int
-ipfw_chg_hook(SYSCTL_HANDLER_ARGS)
-{
- int *enable;
- int newval;
- int error;
- int af;
-
- if (arg1 == &VNET_NAME(fw_enable)) {
- enable = &V_fw_enable;
- af = AF_INET;
- }
-#ifdef INET6
- else if (arg1 == &VNET_NAME(fw6_enable)) {
- enable = &V_fw6_enable;
- af = AF_INET6;
- }
-#endif
- else if (arg1 == &VNET_NAME(fwlink_enable)) {
- enable = &V_fwlink_enable;
- af = AF_LINK;
- }
- else
- return (EINVAL);
-
- newval = *enable;
-
- /* Handle sysctl change */
- error = sysctl_handle_int(oidp, &newval, 0, req);
-
- if (error)
- return (error);
-
- /* Formalize new value */
- newval = (newval) ? 1 : 0;
-
- if (*enable == newval)
- return (0);
-
- error = ipfw_hook(newval, af);
- if (error)
- return (error);
- *enable = newval;
-
- return (0);
-}
-/* end of file */
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