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1629 |
jcastillo |
/*
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* IP firewalling code. This is taken from 4.4BSD. Please note the
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* copyright message below. As per the GPL it must be maintained
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* and the licenses thus do not conflict. While this port is subject
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* to the GPL I also place my modifications under the original
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* license in recognition of the original copyright.
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* -- Alan Cox.
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*
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* Ported from BSD to Linux,
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* Alan Cox 22/Nov/1994.
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* Zeroing /proc and other additions
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* Jos Vos 4/Feb/1995.
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* Merged and included the FreeBSD-Current changes at Ugen's request
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* (but hey it's a lot cleaner now). Ugen would prefer in some ways
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* we waited for his final product but since Linux 1.2.0 is about to
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* appear it's not practical - Read: It works, it's not clean but please
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* don't consider it to be his standard of finished work.
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* Alan Cox 12/Feb/1995
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* Porting bidirectional entries from BSD, fixing accounting issues,
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* adding struct ip_fwpkt for checking packets with interface address
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* Jos Vos 5/Mar/1995.
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* Established connections (ACK check), ACK check on bidirectional rules,
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* ICMP type check.
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* Wilfred Mollenvanger 7/7/1995.
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* TCP attack protection.
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* Alan Cox 25/8/95, based on information from bugtraq.
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* ICMP type printk, IP_FW_F_APPEND
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* Bernd Eckenfels 1996-01-31
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* Split blocking chain into input and output chains, add new "insert" and
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* "append" commands to replace semi-intelligent "add" command, let "delete".
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* only delete the first matching entry, use 0xFFFF (0xFF) as ports (ICMP
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* types) when counting packets being 2nd and further fragments.
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* Jos Vos <jos@xos.nl> 8/2/1996.
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* Add support for matching on device names.
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* Jos Vos <jos@xos.nl> 15/2/1996.
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* Transparent proxying support.
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* Willy Konynenberg <willy@xos.nl> 10/5/96.
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* Make separate accounting on incoming and outgoing packets possible.
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* Jos Vos <jos@xos.nl> 18/5/1996.
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* Add timeout reprieve for idle control channels.
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* Keith Owens <kaos@audio.apana.org.au> 05/07/1996.
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*
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*
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* Masquerading functionality
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*
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* Copyright (c) 1994 Pauline Middelink
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*
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* The pieces which added masquerading functionality are totally
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* my responsibility and have nothing to with the original authors
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* copyright or doing.
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*
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* Parts distributed under GPL.
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*
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* Fixes:
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* Pauline Middelink : Added masquerading.
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* Alan Cox : Fixed an error in the merge.
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* Thomas Quinot : Fixed port spoofing.
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* Alan Cox : Cleaned up retransmits in spoofing.
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* Alan Cox : Cleaned up length setting.
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* Wouter Gadeyne : Fixed masquerading support of ftp PORT commands
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*
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* Juan Jose Ciarlante : Masquerading code moved to ip_masq.c
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*
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* All the real work was done by .....
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*
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*/
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/*
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* Copyright (c) 1993 Daniel Boulet
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* Copyright (c) 1994 Ugen J.S.Antsilevich
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*
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* Redistribution and use in source forms, with and without modification,
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* are permitted provided that this entire comment appears intact.
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*
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* Redistribution in binary form may occur without any restrictions.
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* Obviously, it would be nice if you gave credit where credit is due
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* but requiring it would be too onerous.
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*
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* This software is provided ``AS IS'' without any warranties of any kind.
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*/
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#include <linux/config.h>
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#include <asm/segment.h>
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#include <asm/system.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/config.h>
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#include <linux/socket.h>
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#include <linux/sockios.h>
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#include <linux/in.h>
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#include <linux/inet.h>
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#include <linux/netdevice.h>
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#include <linux/icmp.h>
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#include <linux/udp.h>
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#include <net/ip.h>
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#include <net/protocol.h>
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#include <net/route.h>
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#include <net/tcp.h>
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#include <net/udp.h>
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#include <net/sock.h>
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#include <net/icmp.h>
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#include <linux/firewall.h>
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#include <linux/ip_fw.h>
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#ifdef CONFIG_IP_MASQUERADE
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#include <net/ip_masq.h>
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#endif
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#include <net/checksum.h>
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#include <linux/proc_fs.h>
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#include <linux/stat.h>
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/*
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* Implement IP packet firewall
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*/
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#ifdef DEBUG_IP_FIREWALL
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#define dprintf1(a) printk(a)
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#define dprintf2(a1,a2) printk(a1,a2)
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#define dprintf3(a1,a2,a3) printk(a1,a2,a3)
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#define dprintf4(a1,a2,a3,a4) printk(a1,a2,a3,a4)
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#else
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#define dprintf1(a)
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#define dprintf2(a1,a2)
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#define dprintf3(a1,a2,a3)
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#define dprintf4(a1,a2,a3,a4)
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#endif
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#define print_ip(a) printk("%ld.%ld.%ld.%ld",(ntohl(a)>>24)&0xFF,\
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(ntohl(a)>>16)&0xFF,\
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(ntohl(a)>>8)&0xFF,\
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(ntohl(a))&0xFF);
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| 139 |
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#ifdef DEBUG_IP_FIREWALL
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#define dprint_ip(a) print_ip(a)
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#else
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#define dprint_ip(a)
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#endif
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#if defined(CONFIG_IP_ACCT) || defined(CONFIG_IP_FIREWALL)
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struct ip_fw *ip_fw_fwd_chain;
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struct ip_fw *ip_fw_in_chain;
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struct ip_fw *ip_fw_out_chain;
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struct ip_fw *ip_acct_chain;
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static struct ip_fw **chains[] =
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{&ip_fw_fwd_chain, &ip_fw_in_chain, &ip_fw_out_chain, &ip_acct_chain};
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int ip_fw_fwd_policy=IP_FW_F_ACCEPT;
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int ip_fw_in_policy=IP_FW_F_ACCEPT;
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int ip_fw_out_policy=IP_FW_F_ACCEPT;
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static int *policies[] =
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{&ip_fw_fwd_policy, &ip_fw_in_policy, &ip_fw_out_policy};
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#endif
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/*
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* Returns 1 if the port is matched by the vector, 0 otherwise
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*/
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extern inline int port_match(unsigned short *portptr,int nports,unsigned short port,int range_flag)
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{
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if (!nports)
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return 1;
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if ( range_flag )
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{
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if ( portptr[0] <= port && port <= portptr[1] )
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{
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return( 1 );
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}
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nports -= 2;
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portptr += 2;
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}
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while ( nports-- > 0 )
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{
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if ( *portptr++ == port )
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{
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return( 1 );
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}
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}
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return(0);
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}
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#if defined(CONFIG_IP_ACCT) || defined(CONFIG_IP_FIREWALL)
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/*
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* Returns one of the generic firewall policies, like FW_ACCEPT.
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* Also does accounting so you can feed it the accounting chain.
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*
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* The modes is either IP_FW_MODE_FW (normal firewall mode),
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* IP_FW_MODE_ACCT_IN or IP_FW_MODE_ACCT_OUT (accounting mode,
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* steps through the entire chain and handles fragments
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* differently), or IP_FW_MODE_CHK (handles user-level check,
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* counters are not updated).
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*/
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int ip_fw_chk(struct iphdr *ip, struct device *rif, __u16 *redirport, struct ip_fw *chain, int policy, int mode)
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{
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struct ip_fw *f;
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struct tcphdr *tcp=(struct tcphdr *)((__u32 *)ip+ip->ihl);
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struct udphdr *udp=(struct udphdr *)((__u32 *)ip+ip->ihl);
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struct icmphdr *icmp=(struct icmphdr *)((__u32 *)ip+ip->ihl);
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__u32 src, dst;
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__u16 src_port=0xFFFF, dst_port=0xFFFF, icmp_type=0xFF;
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unsigned short f_prt=0, prt;
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char notcpsyn=0, notcpack=0, match;
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unsigned short offset;
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int answer;
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unsigned char tosand, tosxor;
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/*
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* If the chain is empty follow policy. The BSD one
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* accepts anything giving you a time window while
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* flushing and rebuilding the tables.
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*/
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src = ip->saddr;
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dst = ip->daddr;
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/*
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* This way we handle fragmented packets.
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* we ignore all fragments but the first one
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* so the whole packet can't be reassembled.
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| 233 |
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* This way we relay on the full info which
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* stored only in first packet.
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| 235 |
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*
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| 236 |
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* Note that this theoretically allows partial packet
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| 237 |
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* spoofing. Not very dangerous but paranoid people may
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| 238 |
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* wish to play with this. It also allows the so called
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| 239 |
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* "fragment bomb" denial of service attack on some types
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| 240 |
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* of system.
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| 241 |
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*/
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| 242 |
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| 243 |
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offset = ntohs(ip->frag_off) & IP_OFFSET;
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| 245 |
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/*
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| 246 |
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* Don't allow a fragment of TCP 8 bytes in. Nobody
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| 247 |
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* normal causes this. Its a cracker trying to break
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| 248 |
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* in by doing a flag overwrite to pass the direction
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| 249 |
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* checks.
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| 250 |
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*/
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| 251 |
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| 252 |
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if (offset == 1 && ip->protocol == IPPROTO_TCP)
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| 253 |
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return FW_BLOCK;
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| 254 |
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| 255 |
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if (offset!=0 && !(mode & (IP_FW_MODE_ACCT_IN|IP_FW_MODE_ACCT_OUT)) &&
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| 256 |
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(ip->protocol == IPPROTO_TCP || ip->protocol == IPPROTO_UDP ||
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| 257 |
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ip->protocol == IPPROTO_ICMP))
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| 258 |
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return FW_ACCEPT;
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| 259 |
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| 260 |
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/*
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| 261 |
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* Header fragment for TCP is too small to check the bits.
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| 262 |
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*/
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| 263 |
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| 264 |
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if(ip->protocol==IPPROTO_TCP && (ip->ihl<<2)+16 > ntohs(ip->tot_len))
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| 265 |
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return FW_BLOCK;
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| 266 |
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| 267 |
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/*
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| 268 |
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* Too short.
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| 269 |
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*
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| 270 |
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* But only too short for a packet with ports...
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| 271 |
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*/
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| 272 |
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| 273 |
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else if((ntohs(ip->tot_len)<8+(ip->ihl<<2))&&(ip->protocol==IPPROTO_TCP || ip->protocol==IPPROTO_UDP))
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| 274 |
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return FW_BLOCK;
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| 275 |
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| 276 |
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src = ip->saddr;
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| 277 |
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dst = ip->daddr;
|
| 278 |
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|
| 279 |
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/*
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| 280 |
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* If we got interface from which packet came
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| 281 |
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* we can use the address directly. This is unlike
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| 282 |
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* 4.4BSD derived systems that have an address chain
|
| 283 |
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* per device. We have a device per address with dummy
|
| 284 |
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* devices instead.
|
| 285 |
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*/
|
| 286 |
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|
| 287 |
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dprintf1("Packet ");
|
| 288 |
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switch(ip->protocol)
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| 289 |
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{
|
| 290 |
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case IPPROTO_TCP:
|
| 291 |
|
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dprintf1("TCP ");
|
| 292 |
|
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/* ports stay 0xFFFF if it is not the first fragment */
|
| 293 |
|
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if (!offset) {
|
| 294 |
|
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src_port=ntohs(tcp->source);
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| 295 |
|
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dst_port=ntohs(tcp->dest);
|
| 296 |
|
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if(!tcp->ack && !tcp->rst)
|
| 297 |
|
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/* We do NOT have ACK, value TRUE */
|
| 298 |
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notcpack=1;
|
| 299 |
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if(!tcp->syn || !notcpack)
|
| 300 |
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/* We do NOT have SYN, value TRUE */
|
| 301 |
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notcpsyn=1;
|
| 302 |
|
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}
|
| 303 |
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prt=IP_FW_F_TCP;
|
| 304 |
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break;
|
| 305 |
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case IPPROTO_UDP:
|
| 306 |
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dprintf1("UDP ");
|
| 307 |
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/* ports stay 0xFFFF if it is not the first fragment */
|
| 308 |
|
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if (!offset) {
|
| 309 |
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src_port=ntohs(udp->source);
|
| 310 |
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dst_port=ntohs(udp->dest);
|
| 311 |
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}
|
| 312 |
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prt=IP_FW_F_UDP;
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| 313 |
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break;
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| 314 |
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case IPPROTO_ICMP:
|
| 315 |
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/* icmp_type stays 255 if it is not the first fragment */
|
| 316 |
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if (!offset)
|
| 317 |
|
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icmp_type=(__u16)(icmp->type);
|
| 318 |
|
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dprintf2("ICMP:%d ",icmp_type);
|
| 319 |
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prt=IP_FW_F_ICMP;
|
| 320 |
|
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break;
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| 321 |
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default:
|
| 322 |
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dprintf2("p=%d ",ip->protocol);
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| 323 |
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prt=IP_FW_F_ALL;
|
| 324 |
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break;
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| 325 |
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}
|
| 326 |
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#ifdef DEBUG_IP_FIREWALL
|
| 327 |
|
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dprint_ip(ip->saddr);
|
| 328 |
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|
| 329 |
|
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if (ip->protocol==IPPROTO_TCP || ip->protocol==IPPROTO_UDP)
|
| 330 |
|
|
/* This will print 65535 when it is not the first fragment! */
|
| 331 |
|
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dprintf2(":%d ", src_port);
|
| 332 |
|
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dprint_ip(ip->daddr);
|
| 333 |
|
|
if (ip->protocol==IPPROTO_TCP || ip->protocol==IPPROTO_UDP)
|
| 334 |
|
|
/* This will print 65535 when it is not the first fragment! */
|
| 335 |
|
|
dprintf2(":%d ",dst_port);
|
| 336 |
|
|
dprintf1("\n");
|
| 337 |
|
|
#endif
|
| 338 |
|
|
|
| 339 |
|
|
for (f=chain;f;f=f->fw_next)
|
| 340 |
|
|
{
|
| 341 |
|
|
/*
|
| 342 |
|
|
* This is a bit simpler as we don't have to walk
|
| 343 |
|
|
* an interface chain as you do in BSD - same logic
|
| 344 |
|
|
* however.
|
| 345 |
|
|
*/
|
| 346 |
|
|
|
| 347 |
|
|
/*
|
| 348 |
|
|
* Match can become 0x01 (a "normal" match was found),
|
| 349 |
|
|
* 0x02 (a reverse match was found), and 0x03 (the
|
| 350 |
|
|
* IP addresses match in both directions).
|
| 351 |
|
|
* Now we know in which direction(s) we should look
|
| 352 |
|
|
* for a match for the TCP/UDP ports. Both directions
|
| 353 |
|
|
* might match (e.g., when both addresses are on the
|
| 354 |
|
|
* same network for which an address/mask is given), but
|
| 355 |
|
|
* the ports might only match in one direction.
|
| 356 |
|
|
* This was obviously wrong in the original BSD code.
|
| 357 |
|
|
*/
|
| 358 |
|
|
match = 0x00;
|
| 359 |
|
|
|
| 360 |
|
|
if ((src&f->fw_smsk.s_addr)==f->fw_src.s_addr
|
| 361 |
|
|
&& (dst&f->fw_dmsk.s_addr)==f->fw_dst.s_addr)
|
| 362 |
|
|
/* normal direction */
|
| 363 |
|
|
match |= 0x01;
|
| 364 |
|
|
|
| 365 |
|
|
if ((f->fw_flg & IP_FW_F_BIDIR) &&
|
| 366 |
|
|
(dst&f->fw_smsk.s_addr)==f->fw_src.s_addr
|
| 367 |
|
|
&& (src&f->fw_dmsk.s_addr)==f->fw_dst.s_addr)
|
| 368 |
|
|
/* reverse direction */
|
| 369 |
|
|
match |= 0x02;
|
| 370 |
|
|
|
| 371 |
|
|
if (!match)
|
| 372 |
|
|
continue;
|
| 373 |
|
|
|
| 374 |
|
|
/*
|
| 375 |
|
|
* Look for a VIA address match
|
| 376 |
|
|
*/
|
| 377 |
|
|
if(f->fw_via.s_addr && rif)
|
| 378 |
|
|
{
|
| 379 |
|
|
if(rif->pa_addr!=f->fw_via.s_addr)
|
| 380 |
|
|
continue; /* Mismatch */
|
| 381 |
|
|
}
|
| 382 |
|
|
|
| 383 |
|
|
/*
|
| 384 |
|
|
* Look for a VIA device match
|
| 385 |
|
|
*/
|
| 386 |
|
|
if(f->fw_viadev)
|
| 387 |
|
|
{
|
| 388 |
|
|
if(rif!=f->fw_viadev)
|
| 389 |
|
|
continue; /* Mismatch */
|
| 390 |
|
|
}
|
| 391 |
|
|
|
| 392 |
|
|
/*
|
| 393 |
|
|
* Ok the chain addresses match.
|
| 394 |
|
|
*/
|
| 395 |
|
|
|
| 396 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 397 |
|
|
/*
|
| 398 |
|
|
* See if we're in accounting mode and only want to
|
| 399 |
|
|
* count incoming or outgoing packets.
|
| 400 |
|
|
*/
|
| 401 |
|
|
|
| 402 |
|
|
if (mode & (IP_FW_MODE_ACCT_IN|IP_FW_MODE_ACCT_OUT) &&
|
| 403 |
|
|
((mode == IP_FW_MODE_ACCT_IN && f->fw_flg&IP_FW_F_ACCTOUT) ||
|
| 404 |
|
|
(mode == IP_FW_MODE_ACCT_OUT && f->fw_flg&IP_FW_F_ACCTIN)))
|
| 405 |
|
|
continue;
|
| 406 |
|
|
|
| 407 |
|
|
#endif
|
| 408 |
|
|
/*
|
| 409 |
|
|
* For all non-TCP packets and/or non-first fragments,
|
| 410 |
|
|
* notcpsyn and notcpack will always be FALSE,
|
| 411 |
|
|
* so the IP_FW_F_TCPSYN and IP_FW_F_TCPACK flags
|
| 412 |
|
|
* are actually ignored for these packets.
|
| 413 |
|
|
*/
|
| 414 |
|
|
|
| 415 |
|
|
if((f->fw_flg&IP_FW_F_TCPSYN) && notcpsyn)
|
| 416 |
|
|
continue;
|
| 417 |
|
|
|
| 418 |
|
|
if((f->fw_flg&IP_FW_F_TCPACK) && notcpack)
|
| 419 |
|
|
continue;
|
| 420 |
|
|
|
| 421 |
|
|
f_prt=f->fw_flg&IP_FW_F_KIND;
|
| 422 |
|
|
if (f_prt!=IP_FW_F_ALL)
|
| 423 |
|
|
{
|
| 424 |
|
|
/*
|
| 425 |
|
|
* Specific firewall - packet's protocol
|
| 426 |
|
|
* must match firewall's.
|
| 427 |
|
|
*/
|
| 428 |
|
|
|
| 429 |
|
|
if(prt!=f_prt)
|
| 430 |
|
|
continue;
|
| 431 |
|
|
|
| 432 |
|
|
if((prt==IP_FW_F_ICMP &&
|
| 433 |
|
|
! port_match(&f->fw_pts[0], f->fw_nsp,
|
| 434 |
|
|
icmp_type,f->fw_flg&IP_FW_F_SRNG)) ||
|
| 435 |
|
|
!(prt==IP_FW_F_ICMP || ((match & 0x01) &&
|
| 436 |
|
|
port_match(&f->fw_pts[0], f->fw_nsp, src_port,
|
| 437 |
|
|
f->fw_flg&IP_FW_F_SRNG) &&
|
| 438 |
|
|
port_match(&f->fw_pts[f->fw_nsp], f->fw_ndp, dst_port,
|
| 439 |
|
|
f->fw_flg&IP_FW_F_DRNG)) || ((match & 0x02) &&
|
| 440 |
|
|
port_match(&f->fw_pts[0], f->fw_nsp, dst_port,
|
| 441 |
|
|
f->fw_flg&IP_FW_F_SRNG) &&
|
| 442 |
|
|
port_match(&f->fw_pts[f->fw_nsp], f->fw_ndp, src_port,
|
| 443 |
|
|
f->fw_flg&IP_FW_F_DRNG))))
|
| 444 |
|
|
{
|
| 445 |
|
|
continue;
|
| 446 |
|
|
}
|
| 447 |
|
|
}
|
| 448 |
|
|
|
| 449 |
|
|
#ifdef CONFIG_IP_FIREWALL_VERBOSE
|
| 450 |
|
|
/*
|
| 451 |
|
|
* VERY ugly piece of code which actually
|
| 452 |
|
|
* makes kernel printf for matching packets...
|
| 453 |
|
|
*/
|
| 454 |
|
|
|
| 455 |
|
|
if (f->fw_flg & IP_FW_F_PRN)
|
| 456 |
|
|
{
|
| 457 |
|
|
__u32 *opt = (__u32 *) (ip + 1);
|
| 458 |
|
|
int opti;
|
| 459 |
|
|
|
| 460 |
|
|
if(mode == IP_FW_MODE_ACCT_IN)
|
| 461 |
|
|
printk(KERN_INFO "IP acct in ");
|
| 462 |
|
|
else if(mode == IP_FW_MODE_ACCT_OUT)
|
| 463 |
|
|
printk(KERN_INFO "IP acct out ");
|
| 464 |
|
|
else {
|
| 465 |
|
|
if(chain == ip_fw_fwd_chain)
|
| 466 |
|
|
printk(KERN_INFO "IP fw-fwd ");
|
| 467 |
|
|
else if(chain == ip_fw_in_chain)
|
| 468 |
|
|
printk(KERN_INFO "IP fw-in ");
|
| 469 |
|
|
else
|
| 470 |
|
|
printk(KERN_INFO "IP fw-out ");
|
| 471 |
|
|
if(f->fw_flg&IP_FW_F_ACCEPT) {
|
| 472 |
|
|
if(f->fw_flg&IP_FW_F_REDIR)
|
| 473 |
|
|
printk("acc/r%d ", f->fw_pts[f->fw_nsp+f->fw_ndp]);
|
| 474 |
|
|
else if(f->fw_flg&IP_FW_F_MASQ)
|
| 475 |
|
|
printk("acc/masq ");
|
| 476 |
|
|
else
|
| 477 |
|
|
printk("acc ");
|
| 478 |
|
|
} else if(f->fw_flg&IP_FW_F_ICMPRPL)
|
| 479 |
|
|
printk("rej ");
|
| 480 |
|
|
else
|
| 481 |
|
|
printk("deny ");
|
| 482 |
|
|
}
|
| 483 |
|
|
printk(rif ? rif->name : "-");
|
| 484 |
|
|
switch(ip->protocol)
|
| 485 |
|
|
{
|
| 486 |
|
|
case IPPROTO_TCP:
|
| 487 |
|
|
printk(" TCP ");
|
| 488 |
|
|
break;
|
| 489 |
|
|
case IPPROTO_UDP:
|
| 490 |
|
|
printk(" UDP ");
|
| 491 |
|
|
break;
|
| 492 |
|
|
case IPPROTO_ICMP:
|
| 493 |
|
|
printk(" ICMP/%d ", icmp_type);
|
| 494 |
|
|
break;
|
| 495 |
|
|
default:
|
| 496 |
|
|
printk(" PROTO=%d ", ip->protocol);
|
| 497 |
|
|
break;
|
| 498 |
|
|
}
|
| 499 |
|
|
print_ip(ip->saddr);
|
| 500 |
|
|
if(ip->protocol == IPPROTO_TCP || ip->protocol == IPPROTO_UDP)
|
| 501 |
|
|
printk(":%hu", src_port);
|
| 502 |
|
|
printk(" ");
|
| 503 |
|
|
print_ip(ip->daddr);
|
| 504 |
|
|
if(ip->protocol == IPPROTO_TCP || ip->protocol == IPPROTO_UDP)
|
| 505 |
|
|
printk(":%hu", dst_port);
|
| 506 |
|
|
printk(" L=%hu S=0x%2.2hX I=%hu F=0x%4.4hX T=%hu",
|
| 507 |
|
|
ntohs(ip->tot_len), ip->tos, ntohs(ip->id),
|
| 508 |
|
|
ip->frag_off, ip->ttl);
|
| 509 |
|
|
for (opti = 0; opti < (ip->ihl - sizeof(struct iphdr) / 4); opti++)
|
| 510 |
|
|
printk(" O=0x%8.8X", *opt++);
|
| 511 |
|
|
printk("\n");
|
| 512 |
|
|
}
|
| 513 |
|
|
#endif
|
| 514 |
|
|
if (mode != IP_FW_MODE_CHK) {
|
| 515 |
|
|
f->fw_bcnt+=ntohs(ip->tot_len);
|
| 516 |
|
|
f->fw_pcnt++;
|
| 517 |
|
|
}
|
| 518 |
|
|
if (!(mode & (IP_FW_MODE_ACCT_IN|IP_FW_MODE_ACCT_OUT)))
|
| 519 |
|
|
break;
|
| 520 |
|
|
} /* Loop */
|
| 521 |
|
|
|
| 522 |
|
|
if (!(mode & (IP_FW_MODE_ACCT_IN|IP_FW_MODE_ACCT_OUT))) {
|
| 523 |
|
|
|
| 524 |
|
|
/*
|
| 525 |
|
|
* We rely on policy defined in the rejecting entry or, if no match
|
| 526 |
|
|
* was found, we rely on the general policy variable for this type
|
| 527 |
|
|
* of firewall.
|
| 528 |
|
|
*/
|
| 529 |
|
|
|
| 530 |
|
|
if (f!=NULL) {
|
| 531 |
|
|
policy=f->fw_flg;
|
| 532 |
|
|
tosand=f->fw_tosand;
|
| 533 |
|
|
tosxor=f->fw_tosxor;
|
| 534 |
|
|
} else {
|
| 535 |
|
|
tosand=0xFF;
|
| 536 |
|
|
tosxor=0x00;
|
| 537 |
|
|
}
|
| 538 |
|
|
|
| 539 |
|
|
if (policy&IP_FW_F_ACCEPT) {
|
| 540 |
|
|
/* Adjust priority and recompute checksum */
|
| 541 |
|
|
__u8 old_tos = ip->tos;
|
| 542 |
|
|
ip->tos = (old_tos & tosand) ^ tosxor;
|
| 543 |
|
|
if (ip->tos != old_tos)
|
| 544 |
|
|
ip_send_check(ip);
|
| 545 |
|
|
#ifdef CONFIG_IP_TRANSPARENT_PROXY
|
| 546 |
|
|
if (policy&IP_FW_F_REDIR) {
|
| 547 |
|
|
if (redirport)
|
| 548 |
|
|
if ((*redirport = htons(f->fw_pts[f->fw_nsp+f->fw_ndp])) == 0) {
|
| 549 |
|
|
/* Wildcard redirection.
|
| 550 |
|
|
* Note that redirport will become
|
| 551 |
|
|
* 0xFFFF for non-TCP/UDP packets.
|
| 552 |
|
|
*/
|
| 553 |
|
|
*redirport = htons(dst_port);
|
| 554 |
|
|
}
|
| 555 |
|
|
answer = FW_REDIRECT;
|
| 556 |
|
|
} else
|
| 557 |
|
|
#endif
|
| 558 |
|
|
#ifdef CONFIG_IP_MASQUERADE
|
| 559 |
|
|
if (policy&IP_FW_F_MASQ)
|
| 560 |
|
|
answer = FW_MASQUERADE;
|
| 561 |
|
|
else
|
| 562 |
|
|
#endif
|
| 563 |
|
|
answer = FW_ACCEPT;
|
| 564 |
|
|
|
| 565 |
|
|
} else if(policy&IP_FW_F_ICMPRPL)
|
| 566 |
|
|
answer = FW_REJECT;
|
| 567 |
|
|
else
|
| 568 |
|
|
answer = FW_BLOCK;
|
| 569 |
|
|
|
| 570 |
|
|
return answer;
|
| 571 |
|
|
} else
|
| 572 |
|
|
/* we're doing accounting, always ok */
|
| 573 |
|
|
return 0;
|
| 574 |
|
|
}
|
| 575 |
|
|
|
| 576 |
|
|
|
| 577 |
|
|
static void zero_fw_chain(struct ip_fw *chainptr)
|
| 578 |
|
|
{
|
| 579 |
|
|
struct ip_fw *ctmp=chainptr;
|
| 580 |
|
|
while(ctmp)
|
| 581 |
|
|
{
|
| 582 |
|
|
ctmp->fw_pcnt=0L;
|
| 583 |
|
|
ctmp->fw_bcnt=0L;
|
| 584 |
|
|
ctmp=ctmp->fw_next;
|
| 585 |
|
|
}
|
| 586 |
|
|
}
|
| 587 |
|
|
|
| 588 |
|
|
static void free_fw_chain(struct ip_fw *volatile* chainptr)
|
| 589 |
|
|
{
|
| 590 |
|
|
unsigned long flags;
|
| 591 |
|
|
save_flags(flags);
|
| 592 |
|
|
cli();
|
| 593 |
|
|
while ( *chainptr != NULL )
|
| 594 |
|
|
{
|
| 595 |
|
|
struct ip_fw *ftmp;
|
| 596 |
|
|
ftmp = *chainptr;
|
| 597 |
|
|
*chainptr = ftmp->fw_next;
|
| 598 |
|
|
kfree_s(ftmp,sizeof(*ftmp));
|
| 599 |
|
|
}
|
| 600 |
|
|
restore_flags(flags);
|
| 601 |
|
|
}
|
| 602 |
|
|
|
| 603 |
|
|
/* Volatiles to keep some of the compiler versions amused */
|
| 604 |
|
|
|
| 605 |
|
|
static int insert_in_chain(struct ip_fw *volatile* chainptr, struct ip_fw *frwl,int len)
|
| 606 |
|
|
{
|
| 607 |
|
|
struct ip_fw *ftmp;
|
| 608 |
|
|
unsigned long flags;
|
| 609 |
|
|
|
| 610 |
|
|
save_flags(flags);
|
| 611 |
|
|
|
| 612 |
|
|
ftmp = kmalloc( sizeof(struct ip_fw), GFP_ATOMIC );
|
| 613 |
|
|
if ( ftmp == NULL )
|
| 614 |
|
|
{
|
| 615 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 616 |
|
|
printk("ip_fw_ctl: malloc said no\n");
|
| 617 |
|
|
#endif
|
| 618 |
|
|
return( ENOMEM );
|
| 619 |
|
|
}
|
| 620 |
|
|
|
| 621 |
|
|
memcpy(ftmp, frwl, len);
|
| 622 |
|
|
/*
|
| 623 |
|
|
* Allow the more recent "minimise cost" flag to be
|
| 624 |
|
|
* set. [Rob van Nieuwkerk]
|
| 625 |
|
|
*/
|
| 626 |
|
|
ftmp->fw_tosand |= 0x01;
|
| 627 |
|
|
ftmp->fw_tosxor &= 0xFE;
|
| 628 |
|
|
ftmp->fw_pcnt=0L;
|
| 629 |
|
|
ftmp->fw_bcnt=0L;
|
| 630 |
|
|
|
| 631 |
|
|
cli();
|
| 632 |
|
|
|
| 633 |
|
|
if ((ftmp->fw_vianame)[0]) {
|
| 634 |
|
|
if (!(ftmp->fw_viadev = dev_get(ftmp->fw_vianame)))
|
| 635 |
|
|
ftmp->fw_viadev = (struct device *) -1;
|
| 636 |
|
|
} else
|
| 637 |
|
|
ftmp->fw_viadev = NULL;
|
| 638 |
|
|
|
| 639 |
|
|
ftmp->fw_next = *chainptr;
|
| 640 |
|
|
*chainptr=ftmp;
|
| 641 |
|
|
restore_flags(flags);
|
| 642 |
|
|
return(0);
|
| 643 |
|
|
}
|
| 644 |
|
|
|
| 645 |
|
|
static int append_to_chain(struct ip_fw *volatile* chainptr, struct ip_fw *frwl,int len)
|
| 646 |
|
|
{
|
| 647 |
|
|
struct ip_fw *ftmp;
|
| 648 |
|
|
struct ip_fw *chtmp=NULL;
|
| 649 |
|
|
struct ip_fw *volatile chtmp_prev=NULL;
|
| 650 |
|
|
unsigned long flags;
|
| 651 |
|
|
|
| 652 |
|
|
save_flags(flags);
|
| 653 |
|
|
|
| 654 |
|
|
ftmp = kmalloc( sizeof(struct ip_fw), GFP_ATOMIC );
|
| 655 |
|
|
if ( ftmp == NULL )
|
| 656 |
|
|
{
|
| 657 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 658 |
|
|
printk("ip_fw_ctl: malloc said no\n");
|
| 659 |
|
|
#endif
|
| 660 |
|
|
return( ENOMEM );
|
| 661 |
|
|
}
|
| 662 |
|
|
|
| 663 |
|
|
memcpy(ftmp, frwl, len);
|
| 664 |
|
|
/*
|
| 665 |
|
|
* Allow the more recent "minimise cost" flag to be
|
| 666 |
|
|
* set. [Rob van Nieuwkerk]
|
| 667 |
|
|
*/
|
| 668 |
|
|
ftmp->fw_tosand |= 0x01;
|
| 669 |
|
|
ftmp->fw_tosxor &= 0xFE;
|
| 670 |
|
|
ftmp->fw_pcnt=0L;
|
| 671 |
|
|
ftmp->fw_bcnt=0L;
|
| 672 |
|
|
|
| 673 |
|
|
ftmp->fw_next = NULL;
|
| 674 |
|
|
|
| 675 |
|
|
cli();
|
| 676 |
|
|
|
| 677 |
|
|
if ((ftmp->fw_vianame)[0]) {
|
| 678 |
|
|
if (!(ftmp->fw_viadev = dev_get(ftmp->fw_vianame)))
|
| 679 |
|
|
ftmp->fw_viadev = (struct device *) -1;
|
| 680 |
|
|
} else
|
| 681 |
|
|
ftmp->fw_viadev = NULL;
|
| 682 |
|
|
|
| 683 |
|
|
chtmp_prev=NULL;
|
| 684 |
|
|
for (chtmp=*chainptr;chtmp!=NULL;chtmp=chtmp->fw_next)
|
| 685 |
|
|
chtmp_prev=chtmp;
|
| 686 |
|
|
|
| 687 |
|
|
if (chtmp_prev)
|
| 688 |
|
|
chtmp_prev->fw_next=ftmp;
|
| 689 |
|
|
else
|
| 690 |
|
|
*chainptr=ftmp;
|
| 691 |
|
|
restore_flags(flags);
|
| 692 |
|
|
return(0);
|
| 693 |
|
|
}
|
| 694 |
|
|
|
| 695 |
|
|
static int del_from_chain(struct ip_fw *volatile*chainptr, struct ip_fw *frwl)
|
| 696 |
|
|
{
|
| 697 |
|
|
struct ip_fw *ftmp,*ltmp;
|
| 698 |
|
|
unsigned short tport1,tport2,tmpnum;
|
| 699 |
|
|
char matches,was_found;
|
| 700 |
|
|
unsigned long flags;
|
| 701 |
|
|
|
| 702 |
|
|
save_flags(flags);
|
| 703 |
|
|
cli();
|
| 704 |
|
|
|
| 705 |
|
|
ftmp=*chainptr;
|
| 706 |
|
|
|
| 707 |
|
|
if ( ftmp == NULL )
|
| 708 |
|
|
{
|
| 709 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 710 |
|
|
printk("ip_fw_ctl: chain is empty\n");
|
| 711 |
|
|
#endif
|
| 712 |
|
|
restore_flags(flags);
|
| 713 |
|
|
return( EINVAL );
|
| 714 |
|
|
}
|
| 715 |
|
|
|
| 716 |
|
|
ltmp=NULL;
|
| 717 |
|
|
was_found=0;
|
| 718 |
|
|
|
| 719 |
|
|
while( !was_found && ftmp != NULL )
|
| 720 |
|
|
{
|
| 721 |
|
|
matches=1;
|
| 722 |
|
|
if (ftmp->fw_src.s_addr!=frwl->fw_src.s_addr
|
| 723 |
|
|
|| ftmp->fw_dst.s_addr!=frwl->fw_dst.s_addr
|
| 724 |
|
|
|| ftmp->fw_smsk.s_addr!=frwl->fw_smsk.s_addr
|
| 725 |
|
|
|| ftmp->fw_dmsk.s_addr!=frwl->fw_dmsk.s_addr
|
| 726 |
|
|
|| ftmp->fw_via.s_addr!=frwl->fw_via.s_addr
|
| 727 |
|
|
|| ftmp->fw_flg!=frwl->fw_flg)
|
| 728 |
|
|
matches=0;
|
| 729 |
|
|
|
| 730 |
|
|
tport1=ftmp->fw_nsp+ftmp->fw_ndp;
|
| 731 |
|
|
tport2=frwl->fw_nsp+frwl->fw_ndp;
|
| 732 |
|
|
if (tport1!=tport2)
|
| 733 |
|
|
matches=0;
|
| 734 |
|
|
else if (tport1!=0)
|
| 735 |
|
|
{
|
| 736 |
|
|
for (tmpnum=0;tmpnum < tport1 && tmpnum < IP_FW_MAX_PORTS;tmpnum++)
|
| 737 |
|
|
if (ftmp->fw_pts[tmpnum]!=frwl->fw_pts[tmpnum])
|
| 738 |
|
|
matches=0;
|
| 739 |
|
|
}
|
| 740 |
|
|
if (strncmp(ftmp->fw_vianame, frwl->fw_vianame, IFNAMSIZ))
|
| 741 |
|
|
matches=0;
|
| 742 |
|
|
if(matches)
|
| 743 |
|
|
{
|
| 744 |
|
|
was_found=1;
|
| 745 |
|
|
if (ltmp)
|
| 746 |
|
|
{
|
| 747 |
|
|
ltmp->fw_next=ftmp->fw_next;
|
| 748 |
|
|
kfree_s(ftmp,sizeof(*ftmp));
|
| 749 |
|
|
ftmp=ltmp->fw_next;
|
| 750 |
|
|
}
|
| 751 |
|
|
else
|
| 752 |
|
|
{
|
| 753 |
|
|
*chainptr=ftmp->fw_next;
|
| 754 |
|
|
kfree_s(ftmp,sizeof(*ftmp));
|
| 755 |
|
|
ftmp=*chainptr;
|
| 756 |
|
|
}
|
| 757 |
|
|
}
|
| 758 |
|
|
else
|
| 759 |
|
|
{
|
| 760 |
|
|
ltmp = ftmp;
|
| 761 |
|
|
ftmp = ftmp->fw_next;
|
| 762 |
|
|
}
|
| 763 |
|
|
}
|
| 764 |
|
|
restore_flags(flags);
|
| 765 |
|
|
if (was_found)
|
| 766 |
|
|
return 0;
|
| 767 |
|
|
else
|
| 768 |
|
|
return(EINVAL);
|
| 769 |
|
|
}
|
| 770 |
|
|
|
| 771 |
|
|
#endif /* CONFIG_IP_ACCT || CONFIG_IP_FIREWALL */
|
| 772 |
|
|
|
| 773 |
|
|
struct ip_fw *check_ipfw_struct(struct ip_fw *frwl, int len)
|
| 774 |
|
|
{
|
| 775 |
|
|
|
| 776 |
|
|
if ( len != sizeof(struct ip_fw) )
|
| 777 |
|
|
{
|
| 778 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 779 |
|
|
printk("ip_fw_ctl: len=%d, want %d\n",len, sizeof(struct ip_fw));
|
| 780 |
|
|
#endif
|
| 781 |
|
|
return(NULL);
|
| 782 |
|
|
}
|
| 783 |
|
|
|
| 784 |
|
|
if ( (frwl->fw_flg & ~IP_FW_F_MASK) != 0 )
|
| 785 |
|
|
{
|
| 786 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 787 |
|
|
printk("ip_fw_ctl: undefined flag bits set (flags=%x)\n",
|
| 788 |
|
|
frwl->fw_flg);
|
| 789 |
|
|
#endif
|
| 790 |
|
|
return(NULL);
|
| 791 |
|
|
}
|
| 792 |
|
|
|
| 793 |
|
|
#ifndef CONFIG_IP_TRANSPARENT_PROXY
|
| 794 |
|
|
if (frwl->fw_flg & IP_FW_F_REDIR) {
|
| 795 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 796 |
|
|
printk("ip_fw_ctl: unsupported flag IP_FW_F_REDIR\n");
|
| 797 |
|
|
#endif
|
| 798 |
|
|
return(NULL);
|
| 799 |
|
|
}
|
| 800 |
|
|
#endif
|
| 801 |
|
|
|
| 802 |
|
|
#ifndef CONFIG_IP_MASQUERADE
|
| 803 |
|
|
if (frwl->fw_flg & IP_FW_F_MASQ) {
|
| 804 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 805 |
|
|
printk("ip_fw_ctl: unsupported flag IP_FW_F_MASQ\n");
|
| 806 |
|
|
#endif
|
| 807 |
|
|
return(NULL);
|
| 808 |
|
|
}
|
| 809 |
|
|
#endif
|
| 810 |
|
|
|
| 811 |
|
|
if ( (frwl->fw_flg & IP_FW_F_SRNG) && frwl->fw_nsp < 2 )
|
| 812 |
|
|
{
|
| 813 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 814 |
|
|
printk("ip_fw_ctl: src range set but fw_nsp=%d\n",
|
| 815 |
|
|
frwl->fw_nsp);
|
| 816 |
|
|
#endif
|
| 817 |
|
|
return(NULL);
|
| 818 |
|
|
}
|
| 819 |
|
|
|
| 820 |
|
|
if ( (frwl->fw_flg & IP_FW_F_DRNG) && frwl->fw_ndp < 2 )
|
| 821 |
|
|
{
|
| 822 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 823 |
|
|
printk("ip_fw_ctl: dst range set but fw_ndp=%d\n",
|
| 824 |
|
|
frwl->fw_ndp);
|
| 825 |
|
|
#endif
|
| 826 |
|
|
return(NULL);
|
| 827 |
|
|
}
|
| 828 |
|
|
|
| 829 |
|
|
if ( frwl->fw_nsp + frwl->fw_ndp > (frwl->fw_flg & IP_FW_F_REDIR ? IP_FW_MAX_PORTS - 1 : IP_FW_MAX_PORTS) )
|
| 830 |
|
|
{
|
| 831 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 832 |
|
|
printk("ip_fw_ctl: too many ports (%d+%d)\n",
|
| 833 |
|
|
frwl->fw_nsp,frwl->fw_ndp);
|
| 834 |
|
|
#endif
|
| 835 |
|
|
return(NULL);
|
| 836 |
|
|
}
|
| 837 |
|
|
|
| 838 |
|
|
return frwl;
|
| 839 |
|
|
}
|
| 840 |
|
|
|
| 841 |
|
|
|
| 842 |
|
|
|
| 843 |
|
|
|
| 844 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 845 |
|
|
|
| 846 |
|
|
int ip_acct_ctl(int stage, void *m, int len)
|
| 847 |
|
|
{
|
| 848 |
|
|
if ( stage == IP_ACCT_FLUSH )
|
| 849 |
|
|
{
|
| 850 |
|
|
free_fw_chain(&ip_acct_chain);
|
| 851 |
|
|
return(0);
|
| 852 |
|
|
}
|
| 853 |
|
|
if ( stage == IP_ACCT_ZERO )
|
| 854 |
|
|
{
|
| 855 |
|
|
zero_fw_chain(ip_acct_chain);
|
| 856 |
|
|
return(0);
|
| 857 |
|
|
}
|
| 858 |
|
|
if ( stage == IP_ACCT_INSERT || stage == IP_ACCT_APPEND ||
|
| 859 |
|
|
stage == IP_ACCT_DELETE )
|
| 860 |
|
|
{
|
| 861 |
|
|
struct ip_fw *frwl;
|
| 862 |
|
|
|
| 863 |
|
|
if (!(frwl=check_ipfw_struct(m,len)))
|
| 864 |
|
|
return (EINVAL);
|
| 865 |
|
|
|
| 866 |
|
|
switch (stage)
|
| 867 |
|
|
{
|
| 868 |
|
|
case IP_ACCT_INSERT:
|
| 869 |
|
|
return( insert_in_chain(&ip_acct_chain,frwl,len));
|
| 870 |
|
|
case IP_ACCT_APPEND:
|
| 871 |
|
|
return( append_to_chain(&ip_acct_chain,frwl,len));
|
| 872 |
|
|
case IP_ACCT_DELETE:
|
| 873 |
|
|
return( del_from_chain(&ip_acct_chain,frwl));
|
| 874 |
|
|
default:
|
| 875 |
|
|
/*
|
| 876 |
|
|
* Should be panic but... (Why ??? - AC)
|
| 877 |
|
|
*/
|
| 878 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 879 |
|
|
printk("ip_acct_ctl: unknown request %d\n",stage);
|
| 880 |
|
|
#endif
|
| 881 |
|
|
return(EINVAL);
|
| 882 |
|
|
}
|
| 883 |
|
|
}
|
| 884 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 885 |
|
|
printk("ip_acct_ctl: unknown request %d\n",stage);
|
| 886 |
|
|
#endif
|
| 887 |
|
|
return(EINVAL);
|
| 888 |
|
|
}
|
| 889 |
|
|
#endif
|
| 890 |
|
|
|
| 891 |
|
|
#ifdef CONFIG_IP_MASQUERADE_IPAUTOFW
|
| 892 |
|
|
|
| 893 |
|
|
int ip_autofw_add(struct ip_autofw * af)
|
| 894 |
|
|
{
|
| 895 |
|
|
struct ip_autofw * newaf;
|
| 896 |
|
|
init_timer(&af->timer);
|
| 897 |
|
|
newaf = kmalloc( sizeof(struct ip_autofw), GFP_ATOMIC );
|
| 898 |
|
|
if ( newaf == NULL )
|
| 899 |
|
|
{
|
| 900 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 901 |
|
|
printk("ip_autofw_add: malloc said no\n");
|
| 902 |
|
|
#endif
|
| 903 |
|
|
return( ENOMEM );
|
| 904 |
|
|
}
|
| 905 |
|
|
|
| 906 |
|
|
memcpy(newaf, af, sizeof(struct ip_autofw));
|
| 907 |
|
|
newaf->timer.data = (unsigned long) newaf;
|
| 908 |
|
|
newaf->timer.function = ip_autofw_expire;
|
| 909 |
|
|
newaf->timer.expires = 0;
|
| 910 |
|
|
newaf->lastcontact=0;
|
| 911 |
|
|
newaf->next=ip_autofw_hosts;
|
| 912 |
|
|
ip_autofw_hosts=newaf;
|
| 913 |
|
|
return(0);
|
| 914 |
|
|
}
|
| 915 |
|
|
|
| 916 |
|
|
int ip_autofw_del(struct ip_autofw * af)
|
| 917 |
|
|
{
|
| 918 |
|
|
struct ip_autofw * prev, * curr;
|
| 919 |
|
|
prev=NULL;
|
| 920 |
|
|
curr=ip_autofw_hosts;
|
| 921 |
|
|
while (curr)
|
| 922 |
|
|
{
|
| 923 |
|
|
if (af->type == curr->type &&
|
| 924 |
|
|
af->low == curr->low &&
|
| 925 |
|
|
af->high == curr->high &&
|
| 926 |
|
|
af->hidden == curr->hidden &&
|
| 927 |
|
|
af->visible == curr->visible &&
|
| 928 |
|
|
af->protocol == curr->protocol &&
|
| 929 |
|
|
af->where == curr->where &&
|
| 930 |
|
|
af->ctlproto == curr->ctlproto &&
|
| 931 |
|
|
af->ctlport == curr->ctlport)
|
| 932 |
|
|
{
|
| 933 |
|
|
if (prev)
|
| 934 |
|
|
{
|
| 935 |
|
|
prev->next=curr->next;
|
| 936 |
|
|
kfree_s(curr,sizeof(struct ip_autofw));
|
| 937 |
|
|
return(0);
|
| 938 |
|
|
}
|
| 939 |
|
|
else
|
| 940 |
|
|
{
|
| 941 |
|
|
kfree_s(ip_autofw_hosts,sizeof(struct ip_autofw));
|
| 942 |
|
|
ip_autofw_hosts=curr->next;
|
| 943 |
|
|
return(0);
|
| 944 |
|
|
}
|
| 945 |
|
|
}
|
| 946 |
|
|
prev=curr;
|
| 947 |
|
|
curr=curr->next;
|
| 948 |
|
|
}
|
| 949 |
|
|
return(EINVAL);
|
| 950 |
|
|
}
|
| 951 |
|
|
|
| 952 |
|
|
int ip_autofw_flush(void)
|
| 953 |
|
|
{
|
| 954 |
|
|
struct ip_autofw * af;
|
| 955 |
|
|
while (ip_autofw_hosts)
|
| 956 |
|
|
{
|
| 957 |
|
|
af=ip_autofw_hosts;
|
| 958 |
|
|
ip_autofw_hosts=ip_autofw_hosts->next;
|
| 959 |
|
|
kfree_s(af,sizeof(struct ip_autofw));
|
| 960 |
|
|
}
|
| 961 |
|
|
return(0);
|
| 962 |
|
|
}
|
| 963 |
|
|
|
| 964 |
|
|
int ip_autofw_ctl(int stage, void *m, int len)
|
| 965 |
|
|
{
|
| 966 |
|
|
if (stage == IP_AUTOFW_ADD)
|
| 967 |
|
|
return (ip_autofw_add((struct ip_autofw *) m));
|
| 968 |
|
|
|
| 969 |
|
|
if (stage == IP_AUTOFW_DEL)
|
| 970 |
|
|
return (ip_autofw_del((struct ip_autofw *) m));
|
| 971 |
|
|
|
| 972 |
|
|
if (stage == IP_AUTOFW_FLUSH)
|
| 973 |
|
|
return (ip_autofw_flush());
|
| 974 |
|
|
|
| 975 |
|
|
return(EINVAL);
|
| 976 |
|
|
}
|
| 977 |
|
|
|
| 978 |
|
|
#endif /* CONFIG_IP_MASQUERADE_IPAUTOFW */
|
| 979 |
|
|
|
| 980 |
|
|
#ifdef CONFIG_IP_MASQUERADE_IPPORTFW
|
| 981 |
|
|
extern struct ip_portfw *ipportfw_lst[2];
|
| 982 |
|
|
|
| 983 |
|
|
int ip_portfw_del(__u16 protocol, __u16 lport, __u32 laddr)
|
| 984 |
|
|
{
|
| 985 |
|
|
int prot = (protocol==IPPROTO_TCP);
|
| 986 |
|
|
struct ip_portfw *n = ipportfw_lst[prot];
|
| 987 |
|
|
struct ip_portfw *ntmp;
|
| 988 |
|
|
|
| 989 |
|
|
if (!n) return 1;
|
| 990 |
|
|
|
| 991 |
|
|
if (n->lport == lport && n->laddr == laddr) {
|
| 992 |
|
|
ipportfw_lst[prot] = n->next;
|
| 993 |
|
|
kfree_s(n, sizeof(*n));
|
| 994 |
|
|
return 0;
|
| 995 |
|
|
}
|
| 996 |
|
|
for ( ; n->next ; n = n->next)
|
| 997 |
|
|
if (n->next->lport == lport && n->next->laddr == laddr) {
|
| 998 |
|
|
ntmp = n->next;
|
| 999 |
|
|
n->next = n->next->next;
|
| 1000 |
|
|
kfree_s(ntmp, sizeof(*ntmp));
|
| 1001 |
|
|
return 0;
|
| 1002 |
|
|
}
|
| 1003 |
|
|
|
| 1004 |
|
|
/* Entry not found so return an error */
|
| 1005 |
|
|
return 1;
|
| 1006 |
|
|
}
|
| 1007 |
|
|
|
| 1008 |
|
|
void ip_portfw_flush(void)
|
| 1009 |
|
|
{
|
| 1010 |
|
|
int prot;
|
| 1011 |
|
|
struct ip_portfw *c, *n;
|
| 1012 |
|
|
|
| 1013 |
|
|
for (prot = 0; prot < 2; prot++) {
|
| 1014 |
|
|
c = ipportfw_lst[prot];
|
| 1015 |
|
|
ipportfw_lst[prot] = NULL;
|
| 1016 |
|
|
for ( ; c; c = n) {
|
| 1017 |
|
|
n = c->next;
|
| 1018 |
|
|
kfree_s(c, size(*c));
|
| 1019 |
|
|
}
|
| 1020 |
|
|
}
|
| 1021 |
|
|
}
|
| 1022 |
|
|
|
| 1023 |
|
|
int ip_portfw_add(__u16 protocol, __u16 lport, __u32 laddr, __u16 rport, __u32 raddr)
|
| 1024 |
|
|
{
|
| 1025 |
|
|
struct ip_portfw *newportfw;
|
| 1026 |
|
|
int prot = (protocol==IPPROTO_TCP);
|
| 1027 |
|
|
|
| 1028 |
|
|
newportfw = (struct ip_portfw*)
|
| 1029 |
|
|
kmalloc(sizeof(struct ip_portfw), GFP_ATOMIC);
|
| 1030 |
|
|
|
| 1031 |
|
|
if (!newportfw)
|
| 1032 |
|
|
return 1;
|
| 1033 |
|
|
|
| 1034 |
|
|
newportfw->laddr = laddr;
|
| 1035 |
|
|
newportfw->lport = lport;
|
| 1036 |
|
|
newportfw->rport = rport;
|
| 1037 |
|
|
newportfw->raddr = raddr;
|
| 1038 |
|
|
newportfw->next = ipportfw_lst[prot];
|
| 1039 |
|
|
ipportfw_lst[prot] = newportfw;
|
| 1040 |
|
|
|
| 1041 |
|
|
return 0;
|
| 1042 |
|
|
}
|
| 1043 |
|
|
|
| 1044 |
|
|
int ip_portfw_ctl(int cmd, void *m, int len)
|
| 1045 |
|
|
{
|
| 1046 |
|
|
unsigned long flags;
|
| 1047 |
|
|
int failed;
|
| 1048 |
|
|
struct ip_portfw_edits *mm = (struct ip_portfw_edits *) m;
|
| 1049 |
|
|
|
| 1050 |
|
|
/* Don't trust the lusers - plenty of error checking! */
|
| 1051 |
|
|
if (cmd != IP_PORTFW_ADD && cmd != IP_PORTFW_DEL
|
| 1052 |
|
|
&& cmd != IP_PORTFW_FLUSH)
|
| 1053 |
|
|
return (EINVAL);
|
| 1054 |
|
|
|
| 1055 |
|
|
if (cmd != IP_PORTFW_FLUSH) {
|
| 1056 |
|
|
if (mm->lport < IP_PORTFW_PORT_MIN || mm->lport > IP_PORTFW_PORT_MAX)
|
| 1057 |
|
|
return (EINVAL);
|
| 1058 |
|
|
|
| 1059 |
|
|
if (mm->protocol!=IPPROTO_TCP && mm->protocol!=IPPROTO_UDP)
|
| 1060 |
|
|
return (EINVAL);
|
| 1061 |
|
|
}
|
| 1062 |
|
|
|
| 1063 |
|
|
if (cmd == IP_PORTFW_ADD) {
|
| 1064 |
|
|
save_flags(flags); cli();
|
| 1065 |
|
|
ip_portfw_del(mm->protocol, htons(mm->lport), htonl(mm->laddr));
|
| 1066 |
|
|
failed = ip_portfw_add(mm->protocol,
|
| 1067 |
|
|
htons(mm->lport), htonl(mm->laddr),
|
| 1068 |
|
|
htons(mm->rport), htonl(mm->raddr));
|
| 1069 |
|
|
restore_flags(flags);
|
| 1070 |
|
|
return (failed ? ENOMEM : 0);
|
| 1071 |
|
|
}
|
| 1072 |
|
|
else if (cmd == IP_PORTFW_DEL) {
|
| 1073 |
|
|
save_flags(flags); cli();
|
| 1074 |
|
|
failed = ip_portfw_del(mm->protocol, htons(mm->lport),
|
| 1075 |
|
|
htonl(mm->laddr));
|
| 1076 |
|
|
restore_flags(flags);
|
| 1077 |
|
|
return (failed ? EINVAL : 0);
|
| 1078 |
|
|
}
|
| 1079 |
|
|
else if (cmd == IP_PORTFW_FLUSH) {
|
| 1080 |
|
|
save_flags(flags); cli();
|
| 1081 |
|
|
ip_portfw_flush();
|
| 1082 |
|
|
restore_flags(flags);
|
| 1083 |
|
|
return 0;
|
| 1084 |
|
|
}
|
| 1085 |
|
|
else
|
| 1086 |
|
|
return (EINVAL); /* This should have avoided in ip_sockglue.c */
|
| 1087 |
|
|
}
|
| 1088 |
|
|
#endif /* CONFIG_IP_MASQUERADE_IPPORTFW */
|
| 1089 |
|
|
|
| 1090 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1091 |
|
|
int ip_fw_ctl(int stage, void *m, int len)
|
| 1092 |
|
|
{
|
| 1093 |
|
|
int cmd, fwtype;
|
| 1094 |
|
|
|
| 1095 |
|
|
cmd = stage & IP_FW_COMMAND;
|
| 1096 |
|
|
fwtype = (stage & IP_FW_TYPE) >> IP_FW_SHIFT;
|
| 1097 |
|
|
|
| 1098 |
|
|
if ( cmd == IP_FW_FLUSH )
|
| 1099 |
|
|
{
|
| 1100 |
|
|
free_fw_chain(chains[fwtype]);
|
| 1101 |
|
|
return(0);
|
| 1102 |
|
|
}
|
| 1103 |
|
|
|
| 1104 |
|
|
if ( cmd == IP_FW_ZERO )
|
| 1105 |
|
|
{
|
| 1106 |
|
|
zero_fw_chain(*chains[fwtype]);
|
| 1107 |
|
|
return(0);
|
| 1108 |
|
|
}
|
| 1109 |
|
|
|
| 1110 |
|
|
if ( cmd == IP_FW_POLICY )
|
| 1111 |
|
|
{
|
| 1112 |
|
|
int *tmp_policy_ptr;
|
| 1113 |
|
|
tmp_policy_ptr=(int *)m;
|
| 1114 |
|
|
*policies[fwtype] = *tmp_policy_ptr;
|
| 1115 |
|
|
return 0;
|
| 1116 |
|
|
}
|
| 1117 |
|
|
|
| 1118 |
|
|
if ( cmd == IP_FW_CHECK )
|
| 1119 |
|
|
{
|
| 1120 |
|
|
struct device *viadev;
|
| 1121 |
|
|
struct ip_fwpkt *ipfwp;
|
| 1122 |
|
|
struct iphdr *ip;
|
| 1123 |
|
|
|
| 1124 |
|
|
if ( len != sizeof(struct ip_fwpkt) )
|
| 1125 |
|
|
{
|
| 1126 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1127 |
|
|
printk("ip_fw_ctl: length=%d, expected %d\n",
|
| 1128 |
|
|
len, sizeof(struct ip_fwpkt));
|
| 1129 |
|
|
#endif
|
| 1130 |
|
|
return( EINVAL );
|
| 1131 |
|
|
}
|
| 1132 |
|
|
|
| 1133 |
|
|
ipfwp = (struct ip_fwpkt *)m;
|
| 1134 |
|
|
ip = &(ipfwp->fwp_iph);
|
| 1135 |
|
|
|
| 1136 |
|
|
if ( !(viadev = dev_get(ipfwp->fwp_vianame)) ) {
|
| 1137 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1138 |
|
|
printk("ip_fw_ctl: invalid device \"%s\"\n", ipfwp->fwp_vianame);
|
| 1139 |
|
|
#endif
|
| 1140 |
|
|
return(EINVAL);
|
| 1141 |
|
|
} else if ( viadev->pa_addr != ipfwp->fwp_via.s_addr ) {
|
| 1142 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1143 |
|
|
printk("ip_fw_ctl: device \"%s\" has another IP address\n",
|
| 1144 |
|
|
ipfwp->fwp_vianame);
|
| 1145 |
|
|
#endif
|
| 1146 |
|
|
return(EINVAL);
|
| 1147 |
|
|
} else if ( ip->ihl != sizeof(struct iphdr) / sizeof(int)) {
|
| 1148 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1149 |
|
|
printk("ip_fw_ctl: ip->ihl=%d, want %d\n",ip->ihl,
|
| 1150 |
|
|
sizeof(struct iphdr)/sizeof(int));
|
| 1151 |
|
|
#endif
|
| 1152 |
|
|
return(EINVAL);
|
| 1153 |
|
|
}
|
| 1154 |
|
|
|
| 1155 |
|
|
switch (ip_fw_chk(ip, viadev, NULL, *chains[fwtype],
|
| 1156 |
|
|
*policies[fwtype], IP_FW_MODE_CHK))
|
| 1157 |
|
|
{
|
| 1158 |
|
|
case FW_ACCEPT:
|
| 1159 |
|
|
return(0);
|
| 1160 |
|
|
case FW_REDIRECT:
|
| 1161 |
|
|
return(ECONNABORTED);
|
| 1162 |
|
|
case FW_MASQUERADE:
|
| 1163 |
|
|
return(ECONNRESET);
|
| 1164 |
|
|
case FW_REJECT:
|
| 1165 |
|
|
return(ECONNREFUSED);
|
| 1166 |
|
|
default: /* FW_BLOCK */
|
| 1167 |
|
|
return(ETIMEDOUT);
|
| 1168 |
|
|
}
|
| 1169 |
|
|
}
|
| 1170 |
|
|
|
| 1171 |
|
|
if ( cmd == IP_FW_MASQ_TIMEOUTS )
|
| 1172 |
|
|
{
|
| 1173 |
|
|
#ifdef CONFIG_IP_MASQUERADE
|
| 1174 |
|
|
struct ip_fw_masq *masq;
|
| 1175 |
|
|
|
| 1176 |
|
|
if ( len != sizeof(struct ip_fw_masq) )
|
| 1177 |
|
|
{
|
| 1178 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1179 |
|
|
printk("ip_fw_ctl (masq): length %d, expected %d\n",
|
| 1180 |
|
|
len, sizeof(struct ip_fw_masq));
|
| 1181 |
|
|
|
| 1182 |
|
|
#endif
|
| 1183 |
|
|
return( EINVAL );
|
| 1184 |
|
|
}
|
| 1185 |
|
|
|
| 1186 |
|
|
masq = (struct ip_fw_masq *) m;
|
| 1187 |
|
|
|
| 1188 |
|
|
if (masq->tcp_timeout)
|
| 1189 |
|
|
{
|
| 1190 |
|
|
ip_masq_expire->tcp_timeout = masq->tcp_timeout;
|
| 1191 |
|
|
}
|
| 1192 |
|
|
|
| 1193 |
|
|
if (masq->tcp_fin_timeout)
|
| 1194 |
|
|
{
|
| 1195 |
|
|
ip_masq_expire->tcp_fin_timeout = masq->tcp_fin_timeout;
|
| 1196 |
|
|
}
|
| 1197 |
|
|
|
| 1198 |
|
|
if (masq->udp_timeout)
|
| 1199 |
|
|
{
|
| 1200 |
|
|
ip_masq_expire->udp_timeout = masq->udp_timeout;
|
| 1201 |
|
|
}
|
| 1202 |
|
|
|
| 1203 |
|
|
return 0;
|
| 1204 |
|
|
#else
|
| 1205 |
|
|
return( EINVAL );
|
| 1206 |
|
|
#endif
|
| 1207 |
|
|
}
|
| 1208 |
|
|
|
| 1209 |
|
|
/*
|
| 1210 |
|
|
* Here we really working hard-adding new elements
|
| 1211 |
|
|
* to blocking/forwarding chains or deleting 'em
|
| 1212 |
|
|
*/
|
| 1213 |
|
|
|
| 1214 |
|
|
if ( cmd == IP_FW_INSERT || cmd == IP_FW_APPEND || cmd == IP_FW_DELETE )
|
| 1215 |
|
|
{
|
| 1216 |
|
|
struct ip_fw *frwl;
|
| 1217 |
|
|
int fwtype;
|
| 1218 |
|
|
|
| 1219 |
|
|
frwl=check_ipfw_struct(m,len);
|
| 1220 |
|
|
if (frwl==NULL)
|
| 1221 |
|
|
return (EINVAL);
|
| 1222 |
|
|
fwtype = (stage & IP_FW_TYPE) >> IP_FW_SHIFT;
|
| 1223 |
|
|
|
| 1224 |
|
|
switch (cmd)
|
| 1225 |
|
|
{
|
| 1226 |
|
|
case IP_FW_INSERT:
|
| 1227 |
|
|
return(insert_in_chain(chains[fwtype],frwl,len));
|
| 1228 |
|
|
case IP_FW_APPEND:
|
| 1229 |
|
|
return(append_to_chain(chains[fwtype],frwl,len));
|
| 1230 |
|
|
case IP_FW_DELETE:
|
| 1231 |
|
|
return(del_from_chain(chains[fwtype],frwl));
|
| 1232 |
|
|
default:
|
| 1233 |
|
|
/*
|
| 1234 |
|
|
* Should be panic but... (Why are BSD people panic obsessed ??)
|
| 1235 |
|
|
*/
|
| 1236 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1237 |
|
|
printk("ip_fw_ctl: unknown request %d\n",stage);
|
| 1238 |
|
|
#endif
|
| 1239 |
|
|
return(EINVAL);
|
| 1240 |
|
|
}
|
| 1241 |
|
|
}
|
| 1242 |
|
|
|
| 1243 |
|
|
#ifdef DEBUG_IP_FIREWALL
|
| 1244 |
|
|
printk("ip_fw_ctl: unknown request %d\n",stage);
|
| 1245 |
|
|
#endif
|
| 1246 |
|
|
return(EINVAL);
|
| 1247 |
|
|
}
|
| 1248 |
|
|
#endif /* CONFIG_IP_FIREWALL */
|
| 1249 |
|
|
|
| 1250 |
|
|
#if defined(CONFIG_IP_FIREWALL) || defined(CONFIG_IP_ACCT)
|
| 1251 |
|
|
|
| 1252 |
|
|
static int ip_chain_procinfo(int stage, char *buffer, char **start,
|
| 1253 |
|
|
off_t offset, int length, int reset)
|
| 1254 |
|
|
{
|
| 1255 |
|
|
off_t pos=0, begin=0;
|
| 1256 |
|
|
struct ip_fw *i;
|
| 1257 |
|
|
unsigned long flags;
|
| 1258 |
|
|
int len, p;
|
| 1259 |
|
|
int last_len = 0;
|
| 1260 |
|
|
|
| 1261 |
|
|
|
| 1262 |
|
|
switch(stage)
|
| 1263 |
|
|
{
|
| 1264 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1265 |
|
|
case IP_FW_IN:
|
| 1266 |
|
|
i = ip_fw_in_chain;
|
| 1267 |
|
|
len=sprintf(buffer, "IP firewall input rules, default %d\n",
|
| 1268 |
|
|
ip_fw_in_policy);
|
| 1269 |
|
|
break;
|
| 1270 |
|
|
case IP_FW_OUT:
|
| 1271 |
|
|
i = ip_fw_out_chain;
|
| 1272 |
|
|
len=sprintf(buffer, "IP firewall output rules, default %d\n",
|
| 1273 |
|
|
ip_fw_out_policy);
|
| 1274 |
|
|
break;
|
| 1275 |
|
|
case IP_FW_FWD:
|
| 1276 |
|
|
i = ip_fw_fwd_chain;
|
| 1277 |
|
|
len=sprintf(buffer, "IP firewall forward rules, default %d\n",
|
| 1278 |
|
|
ip_fw_fwd_policy);
|
| 1279 |
|
|
break;
|
| 1280 |
|
|
#endif
|
| 1281 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 1282 |
|
|
case IP_FW_ACCT:
|
| 1283 |
|
|
i = ip_acct_chain;
|
| 1284 |
|
|
len=sprintf(buffer,"IP accounting rules\n");
|
| 1285 |
|
|
break;
|
| 1286 |
|
|
#endif
|
| 1287 |
|
|
default:
|
| 1288 |
|
|
/* this should never be reached, but safety first... */
|
| 1289 |
|
|
i = NULL;
|
| 1290 |
|
|
len=0;
|
| 1291 |
|
|
break;
|
| 1292 |
|
|
}
|
| 1293 |
|
|
|
| 1294 |
|
|
save_flags(flags);
|
| 1295 |
|
|
cli();
|
| 1296 |
|
|
|
| 1297 |
|
|
while(i!=NULL)
|
| 1298 |
|
|
{
|
| 1299 |
|
|
len+=sprintf(buffer+len,"%08lX/%08lX->%08lX/%08lX %.16s %08lX %X ",
|
| 1300 |
|
|
ntohl(i->fw_src.s_addr),ntohl(i->fw_smsk.s_addr),
|
| 1301 |
|
|
ntohl(i->fw_dst.s_addr),ntohl(i->fw_dmsk.s_addr),
|
| 1302 |
|
|
(i->fw_vianame)[0] ? i->fw_vianame : "-",
|
| 1303 |
|
|
ntohl(i->fw_via.s_addr),i->fw_flg);
|
| 1304 |
|
|
len+=sprintf(buffer+len,"%u %u %-10lu %-10lu",
|
| 1305 |
|
|
i->fw_nsp,i->fw_ndp, i->fw_pcnt,i->fw_bcnt);
|
| 1306 |
|
|
for (p = 0; p < IP_FW_MAX_PORTS; p++)
|
| 1307 |
|
|
len+=sprintf(buffer+len, " %u", i->fw_pts[p]);
|
| 1308 |
|
|
len+=sprintf(buffer+len, " A%02X X%02X", i->fw_tosand, i->fw_tosxor);
|
| 1309 |
|
|
buffer[len++]='\n';
|
| 1310 |
|
|
buffer[len]='\0';
|
| 1311 |
|
|
pos=begin+len;
|
| 1312 |
|
|
if(pos<offset)
|
| 1313 |
|
|
{
|
| 1314 |
|
|
len=0;
|
| 1315 |
|
|
begin=pos;
|
| 1316 |
|
|
}
|
| 1317 |
|
|
else if(pos>offset+length)
|
| 1318 |
|
|
{
|
| 1319 |
|
|
len = last_len;
|
| 1320 |
|
|
break;
|
| 1321 |
|
|
}
|
| 1322 |
|
|
else if(reset)
|
| 1323 |
|
|
{
|
| 1324 |
|
|
/* This needs to be done at this specific place! */
|
| 1325 |
|
|
i->fw_pcnt=0L;
|
| 1326 |
|
|
i->fw_bcnt=0L;
|
| 1327 |
|
|
}
|
| 1328 |
|
|
last_len = len;
|
| 1329 |
|
|
i=i->fw_next;
|
| 1330 |
|
|
}
|
| 1331 |
|
|
restore_flags(flags);
|
| 1332 |
|
|
*start=buffer+(offset-begin);
|
| 1333 |
|
|
len-=(offset-begin);
|
| 1334 |
|
|
if(len>length)
|
| 1335 |
|
|
len=length;
|
| 1336 |
|
|
return len;
|
| 1337 |
|
|
}
|
| 1338 |
|
|
#endif
|
| 1339 |
|
|
|
| 1340 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 1341 |
|
|
|
| 1342 |
|
|
static int ip_acct_procinfo(char *buffer, char **start, off_t offset,
|
| 1343 |
|
|
int length, int reset)
|
| 1344 |
|
|
{
|
| 1345 |
|
|
return ip_chain_procinfo(IP_FW_ACCT, buffer,start, offset,length,
|
| 1346 |
|
|
reset);
|
| 1347 |
|
|
}
|
| 1348 |
|
|
|
| 1349 |
|
|
#endif
|
| 1350 |
|
|
|
| 1351 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1352 |
|
|
|
| 1353 |
|
|
static int ip_fw_in_procinfo(char *buffer, char **start, off_t offset,
|
| 1354 |
|
|
int length, int reset)
|
| 1355 |
|
|
{
|
| 1356 |
|
|
return ip_chain_procinfo(IP_FW_IN, buffer,start,offset,length,
|
| 1357 |
|
|
reset);
|
| 1358 |
|
|
}
|
| 1359 |
|
|
|
| 1360 |
|
|
static int ip_fw_out_procinfo(char *buffer, char **start, off_t offset,
|
| 1361 |
|
|
int length, int reset)
|
| 1362 |
|
|
{
|
| 1363 |
|
|
return ip_chain_procinfo(IP_FW_OUT, buffer,start,offset,length,
|
| 1364 |
|
|
reset);
|
| 1365 |
|
|
}
|
| 1366 |
|
|
|
| 1367 |
|
|
static int ip_fw_fwd_procinfo(char *buffer, char **start, off_t offset,
|
| 1368 |
|
|
int length, int reset)
|
| 1369 |
|
|
{
|
| 1370 |
|
|
return ip_chain_procinfo(IP_FW_FWD, buffer,start,offset,length,
|
| 1371 |
|
|
reset);
|
| 1372 |
|
|
}
|
| 1373 |
|
|
#endif
|
| 1374 |
|
|
|
| 1375 |
|
|
|
| 1376 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1377 |
|
|
/*
|
| 1378 |
|
|
* Interface to the generic firewall chains.
|
| 1379 |
|
|
*/
|
| 1380 |
|
|
|
| 1381 |
|
|
int ipfw_input_check(struct firewall_ops *this, int pf, struct device *dev, void *phdr, void *arg)
|
| 1382 |
|
|
{
|
| 1383 |
|
|
return ip_fw_chk(phdr, dev, arg, ip_fw_in_chain, ip_fw_in_policy, IP_FW_MODE_FW);
|
| 1384 |
|
|
}
|
| 1385 |
|
|
|
| 1386 |
|
|
int ipfw_output_check(struct firewall_ops *this, int pf, struct device *dev, void *phdr, void *arg)
|
| 1387 |
|
|
{
|
| 1388 |
|
|
return ip_fw_chk(phdr, dev, arg, ip_fw_out_chain, ip_fw_out_policy, IP_FW_MODE_FW);
|
| 1389 |
|
|
}
|
| 1390 |
|
|
|
| 1391 |
|
|
int ipfw_forward_check(struct firewall_ops *this, int pf, struct device *dev, void *phdr, void *arg)
|
| 1392 |
|
|
{
|
| 1393 |
|
|
return ip_fw_chk(phdr, dev, arg, ip_fw_fwd_chain, ip_fw_fwd_policy, IP_FW_MODE_FW);
|
| 1394 |
|
|
}
|
| 1395 |
|
|
|
| 1396 |
|
|
struct firewall_ops ipfw_ops=
|
| 1397 |
|
|
{
|
| 1398 |
|
|
NULL,
|
| 1399 |
|
|
ipfw_forward_check,
|
| 1400 |
|
|
ipfw_input_check,
|
| 1401 |
|
|
ipfw_output_check,
|
| 1402 |
|
|
PF_INET,
|
| 1403 |
|
|
|
| 1404 |
|
|
};
|
| 1405 |
|
|
|
| 1406 |
|
|
#endif
|
| 1407 |
|
|
|
| 1408 |
|
|
#if defined(CONFIG_IP_ACCT) || defined(CONFIG_IP_FIREWALL)
|
| 1409 |
|
|
|
| 1410 |
|
|
int ipfw_device_event(struct notifier_block *this, unsigned long event, void *ptr)
|
| 1411 |
|
|
{
|
| 1412 |
|
|
struct device *dev=ptr;
|
| 1413 |
|
|
char *devname = dev->name;
|
| 1414 |
|
|
unsigned long flags;
|
| 1415 |
|
|
struct ip_fw *fw;
|
| 1416 |
|
|
int chn;
|
| 1417 |
|
|
|
| 1418 |
|
|
save_flags(flags);
|
| 1419 |
|
|
cli();
|
| 1420 |
|
|
|
| 1421 |
|
|
if (event == NETDEV_UP) {
|
| 1422 |
|
|
for (chn = 0; chn < IP_FW_CHAINS; chn++)
|
| 1423 |
|
|
for (fw = *chains[chn]; fw; fw = fw->fw_next)
|
| 1424 |
|
|
if ((fw->fw_vianame)[0] && !strncmp(devname,
|
| 1425 |
|
|
fw->fw_vianame, IFNAMSIZ))
|
| 1426 |
|
|
fw->fw_viadev = dev;
|
| 1427 |
|
|
} else if (event == NETDEV_DOWN) {
|
| 1428 |
|
|
for (chn = 0; chn < IP_FW_CHAINS; chn++)
|
| 1429 |
|
|
for (fw = *chains[chn]; fw; fw = fw->fw_next)
|
| 1430 |
|
|
/* we could compare just the pointers ... */
|
| 1431 |
|
|
if ((fw->fw_vianame)[0] && !strncmp(devname,
|
| 1432 |
|
|
fw->fw_vianame, IFNAMSIZ))
|
| 1433 |
|
|
fw->fw_viadev = (struct device *) -1;
|
| 1434 |
|
|
}
|
| 1435 |
|
|
|
| 1436 |
|
|
restore_flags(flags);
|
| 1437 |
|
|
return NOTIFY_DONE;
|
| 1438 |
|
|
}
|
| 1439 |
|
|
|
| 1440 |
|
|
static struct notifier_block ipfw_dev_notifier={
|
| 1441 |
|
|
ipfw_device_event,
|
| 1442 |
|
|
NULL,
|
| 1443 |
|
|
|
| 1444 |
|
|
};
|
| 1445 |
|
|
|
| 1446 |
|
|
#endif
|
| 1447 |
|
|
|
| 1448 |
|
|
#ifdef CONFIG_PROC_FS
|
| 1449 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 1450 |
|
|
static struct proc_dir_entry pde1 = {
|
| 1451 |
|
|
PROC_NET_IPACCT, 7, "ip_acct",
|
| 1452 |
|
|
S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0,
|
| 1453 |
|
|
0, &proc_net_inode_operations,
|
| 1454 |
|
|
ip_acct_procinfo
|
| 1455 |
|
|
};
|
| 1456 |
|
|
#endif
|
| 1457 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1458 |
|
|
static struct proc_dir_entry pde2 = {
|
| 1459 |
|
|
PROC_NET_IPFWIN, 8, "ip_input",
|
| 1460 |
|
|
S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0,
|
| 1461 |
|
|
0, &proc_net_inode_operations,
|
| 1462 |
|
|
ip_fw_in_procinfo
|
| 1463 |
|
|
};
|
| 1464 |
|
|
static struct proc_dir_entry pde3 = {
|
| 1465 |
|
|
PROC_NET_IPFWOUT, 9, "ip_output",
|
| 1466 |
|
|
S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0,
|
| 1467 |
|
|
0, &proc_net_inode_operations,
|
| 1468 |
|
|
ip_fw_out_procinfo
|
| 1469 |
|
|
};
|
| 1470 |
|
|
static struct proc_dir_entry pde4 = {
|
| 1471 |
|
|
PROC_NET_IPFWFWD, 10, "ip_forward",
|
| 1472 |
|
|
S_IFREG | S_IRUGO | S_IWUSR, 1, 0, 0,
|
| 1473 |
|
|
0, &proc_net_inode_operations,
|
| 1474 |
|
|
ip_fw_fwd_procinfo
|
| 1475 |
|
|
};
|
| 1476 |
|
|
#endif
|
| 1477 |
|
|
#endif
|
| 1478 |
|
|
|
| 1479 |
|
|
void ip_fw_init(void)
|
| 1480 |
|
|
{
|
| 1481 |
|
|
#ifdef CONFIG_PROC_FS
|
| 1482 |
|
|
#ifdef CONFIG_IP_ACCT
|
| 1483 |
|
|
proc_net_register(&pde1);
|
| 1484 |
|
|
#endif
|
| 1485 |
|
|
#endif
|
| 1486 |
|
|
#ifdef CONFIG_IP_FIREWALL
|
| 1487 |
|
|
|
| 1488 |
|
|
if(register_firewall(PF_INET,&ipfw_ops)<0)
|
| 1489 |
|
|
panic("Unable to register IP firewall.\n");
|
| 1490 |
|
|
|
| 1491 |
|
|
#ifdef CONFIG_PROC_FS
|
| 1492 |
|
|
proc_net_register(&pde2);
|
| 1493 |
|
|
proc_net_register(&pde3);
|
| 1494 |
|
|
proc_net_register(&pde4);
|
| 1495 |
|
|
#endif
|
| 1496 |
|
|
#endif
|
| 1497 |
|
|
#ifdef CONFIG_IP_MASQUERADE
|
| 1498 |
|
|
|
| 1499 |
|
|
/*
|
| 1500 |
|
|
* Initialize masquerading.
|
| 1501 |
|
|
*/
|
| 1502 |
|
|
|
| 1503 |
|
|
ip_masq_init();
|
| 1504 |
|
|
#endif
|
| 1505 |
|
|
|
| 1506 |
|
|
#if defined(CONFIG_IP_ACCT) || defined(CONFIG_IP_FIREWALL)
|
| 1507 |
|
|
/* Register for device up/down reports */
|
| 1508 |
|
|
register_netdevice_notifier(&ipfw_dev_notifier);
|
| 1509 |
|
|
#endif
|
| 1510 |
|
|
}
|
