diff options
Diffstat (limited to 'package/linux/kernel-patches')
| -rw-r--r-- | package/linux/kernel-patches/306-netfilter-layer7-0.9.1 | 2022 |
1 files changed, 2022 insertions, 0 deletions
diff --git a/package/linux/kernel-patches/306-netfilter-layer7-0.9.1 b/package/linux/kernel-patches/306-netfilter-layer7-0.9.1 new file mode 100644 index 000000000..4dd1fce2b --- /dev/null +++ b/package/linux/kernel-patches/306-netfilter-layer7-0.9.1 @@ -0,0 +1,2022 @@ +diff -Nurp linux-2.4.26-stock/Documentation/Configure.help linux-2.4.26-layer7-clean/Documentation/Configure.help +--- linux-2.4.26-stock/Documentation/Configure.help 2004-04-14 08:05:24.000000000 -0500 ++++ linux-2.4.26-layer7-clean/Documentation/Configure.help 2004-06-21 00:18:14.000000000 -0500 +@@ -28819,6 +28819,23 @@ CONFIG_SOUND_WM97XX + + If unsure, say N. + ++CONFIG_IP_NF_MATCH_LAYER7 ++ Say Y if you want to be able to classify connections (and their ++ packets) based on regular expression matching of their application ++ layer data. This is one way to classify applications such as ++ peer-to-peer filesharing systems that do not always use the same ++ port. ++ ++ To compile it as a module, choose M here. If unsure, say N. ++ ++CONFIG_IP_NF_MATCH_LAYER7_DEBUG ++ Say Y to get lots of debugging output. ++ ++CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN ++ Size of the buffer that the application layer data is stored in. ++ Unless you know what you're doing, leave it at the default of 2048 ++ Bytes. ++ + # + # A couple of things I keep forgetting: + # capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet, +diff -Nurp linux-2.4.26-stock/include/linux/netfilter_ipv4/ip_conntrack.h linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ip_conntrack.h +--- linux-2.4.26-stock/include/linux/netfilter_ipv4/ip_conntrack.h 2004-04-14 08:05:40.000000000 -0500 ++++ linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ip_conntrack.h 2004-06-21 00:18:28.000000000 -0500 +@@ -207,6 +207,17 @@ struct ip_conntrack + } nat; + #endif /* CONFIG_IP_NF_NAT_NEEDED */ + ++#if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) ++ struct { ++ unsigned int numpackets; /* surely this is kept track of somewhere else, right? I can't find it... */ ++ char * app_proto; /* "http", "ftp", etc. NULL if unclassifed */ ++ ++ /* the application layer data so far. NULL if ->numpackets > numpackets */ ++ char * app_data; ++ ++ unsigned int app_data_len; ++ } layer7; ++#endif + }; + + /* get master conntrack via master expectation */ +diff -Nurp linux-2.4.26-stock/include/linux/netfilter_ipv4/ipt_layer7.h linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ipt_layer7.h +--- linux-2.4.26-stock/include/linux/netfilter_ipv4/ipt_layer7.h 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/include/linux/netfilter_ipv4/ipt_layer7.h 2004-06-21 00:18:28.000000000 -0500 +@@ -0,0 +1,26 @@ ++/* ++ By Matthew Strait <quadong@users.sf.net>, Dec 2003. ++ http://l7-filter.sf.net ++ ++ This program is free software; you can redistribute it and/or ++ modify it under the terms of the GNU General Public License ++ as published by the Free Software Foundation; either version ++ 2 of the License, or (at your option) any later version. ++ http://www.gnu.org/licenses/gpl.txt ++*/ ++ ++#ifndef _IPT_LAYER7_H ++#define _IPT_LAYER7_H ++ ++#define MAX_PATTERN_LEN 8192 ++#define MAX_PROTOCOL_LEN 256 ++ ++typedef char *(*proc_ipt_search) (char *, char, char *); ++ ++struct ipt_layer7_info { ++ char protocol[MAX_PROTOCOL_LEN]; ++ char invert:1; ++ char pattern[MAX_PATTERN_LEN]; ++}; ++ ++#endif /* _IPT_LAYER7_H */ +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/Config.in linux-2.4.26-layer7-clean/net/ipv4/netfilter/Config.in +--- linux-2.4.26-stock/net/ipv4/netfilter/Config.in 2003-08-25 06:44:44.000000000 -0500 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/Config.in 2004-06-21 00:15:23.000000000 -0500 +@@ -43,6 +43,10 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ]; + if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then + dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES + dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES ++ dep_tristate ' Layer 7 match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7 $CONFIG_IP_NF_CONNTRACK ++ dep_mbool ' Layer 7 debugging output (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7_DEBUG $CONFIG_IP_NF_MATCH_LAYER7 ++ int ' Buffer size for application layer data (256-65536)' CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN 2048 ++ + fi + # The targets + dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/Makefile linux-2.4.26-layer7-clean/net/ipv4/netfilter/Makefile +--- linux-2.4.26-stock/net/ipv4/netfilter/Makefile 2003-08-25 06:44:44.000000000 -0500 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/Makefile 2004-06-21 00:15:22.000000000 -0500 +@@ -87,6 +87,8 @@ obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += i + obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o + obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o + ++obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o ++ + # targets + obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o + obj-$(CONFIG_IP_NF_TARGET_MIRROR) += ipt_MIRROR.o +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_core.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_core.c +--- linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_core.c 2004-02-18 07:36:32.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_core.c 2004-06-21 00:15:22.000000000 -0500 +@@ -339,6 +339,15 @@ destroy_conntrack(struct nf_conntrack *n + } + kfree(ct->master); + } ++ ++ #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) ++ /* This ought to get free'd somewhere. How about here? */ ++ if(ct->layer7.app_proto) /* this is sufficient, right? */ ++ kfree(ct->layer7.app_proto); ++ if(ct->layer7.app_data) ++ kfree(ct->layer7.app_data); ++ #endif ++ + WRITE_UNLOCK(&ip_conntrack_lock); + + if (master) +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_standalone.c +--- linux-2.4.26-stock/net/ipv4/netfilter/ip_conntrack_standalone.c 2004-02-18 07:36:32.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ip_conntrack_standalone.c 2004-06-21 00:15:22.000000000 -0500 +@@ -107,6 +107,13 @@ print_conntrack(char *buffer, struct ip_ + len += sprintf(buffer + len, "[ASSURED] "); + len += sprintf(buffer + len, "use=%u ", + atomic_read(&conntrack->ct_general.use)); ++ ++ #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE) ++ if(conntrack->layer7.app_proto) ++ len += sprintf(buffer + len, "l7proto=%s ", ++ conntrack->layer7.app_proto); ++ #endif ++ + len += sprintf(buffer + len, "\n"); + + return len; +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/ipt_layer7.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/ipt_layer7.c +--- linux-2.4.26-stock/net/ipv4/netfilter/ipt_layer7.c 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/ipt_layer7.c 2004-06-27 19:06:51.000000000 -0500 +@@ -0,0 +1,540 @@ ++/* ++ Kernel module to match application layer (OSI layer 7) ++ data in connections. ++ ++ http://l7-filter.sf.net ++ ++ By Matthew Strait and Ethan Sommer, 2003. ++ ++ This program is free software; you can redistribute it and/or ++ modify it under the terms of the GNU General Public License ++ as published by the Free Software Foundation; either version ++ 2 of the License, or (at your option) any later version. ++ http://www.gnu.org/licenses/gpl.txt ++ ++ Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be> ++ and cls_layer7.c (C) 2003 Matthew Strait, Ethan Sommer, Justin Levandoski ++*/ ++ ++#include <linux/module.h> ++#include <linux/skbuff.h> ++#include <linux/netfilter_ipv4/ip_conntrack.h> ++#include <linux/proc_fs.h> ++#include <linux/ctype.h> ++#include <net/ip.h> ++#include <net/tcp.h> ++ ++#include "regexp/regexp.c" ++ ++#include <linux/netfilter_ipv4/ipt_layer7.h> ++#include <linux/netfilter_ipv4/ip_tables.h> ++ ++MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>"); ++MODULE_LICENSE("GPL"); ++MODULE_DESCRIPTION("iptables application layer match module"); ++ ++#if defined(CONFIG_IP_NF_MATCH_LAYER7_DEBUG) ++ #define DPRINTK(format,args...) printk(format,##args) ++#else ++ #define DPRINTK(format,args...) ++#endif ++ ++/* Number of packets whose data we look at. ++This can be modified through /proc/net/layer7_numpackets */ ++static int num_packets = 8; ++ ++static struct pattern_cache { ++ char * regex_string; ++ regexp * pattern; ++ struct pattern_cache * next; ++} * first_pattern_cache = NULL; ++ ++/* I'm new to locking. Here are my assumptions: ++ ++- No one is going to write to /proc/net/layer7_numpackets over and over ++ within a short period of time, and if they did, nothing awful would happen. ++ ++- This code will never be processing the same packet twice at the same time, ++ because iptables rules need to be traversed in order. ++ ++- It doesn't matter if two packets from different connections are in here at ++ the same time, because they don't share any data. ++ ++- It _does_ matter if two packets from the same connection are here at the same ++ time. In this case, the things we have to protect are the conntracks and ++ the list of compiled patterns. ++*/ ++DECLARE_RWLOCK(ct_lock); ++DECLARE_LOCK(list_lock); ++ ++/* Use instead of regcomp. As we expect to be seeing the same regexps over and ++over again, it make sense to cache the results. */ ++static regexp * compile_and_cache(char * regex_string, char * protocol) ++{ ++ struct pattern_cache * node = first_pattern_cache; ++ struct pattern_cache * last_pattern_cache = first_pattern_cache; ++ struct pattern_cache * tmp; ++ unsigned int len; ++ ++ while (node != NULL) { ++ if (!strcmp(node->regex_string, regex_string)) ++ return node->pattern; ++ ++ last_pattern_cache = node;/* points at the last non-NULL node */ ++ node = node->next; ++ } ++ ++ /* If we reach the end of the list, then we have not yet cached ++ the pattern for this regex. Let's do that now. ++ Be paranoid about running out of memory to avoid list corruption. */ ++ tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC); ++ ++ if(!tmp) { ++ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n"); ++ return NULL; ++ } ++ ++ tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC); ++ tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC); ++ ++ if(!tmp->regex_string || !tmp->pattern) { ++ printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n"); ++ kfree(tmp->regex_string); ++ kfree(tmp->pattern); ++ kfree(tmp); ++ return NULL; ++ } ++ ++ tmp->next = NULL; ++ /* Ok. The new node is all ready now. */ ++ node = tmp; ++ ++ if(first_pattern_cache == NULL) /* list is empty */ ++ first_pattern_cache = node; /* make node the beginning */ ++ else ++ last_pattern_cache->next = node; /* attach node to the end */ ++ ++ /* copy the string and compile the regex */ ++ len = strlen(regex_string); ++ node->pattern = regcomp(regex_string, &len); ++ if ( !node->pattern ) { ++ printk(KERN_ERR "layer7: Error compiling regexp \"%s\" (%s)\n", ++ regex_string, protocol); ++ /* pattern is now cached as NULL, so we won't try again. */ ++ } ++ ++ strcpy(node->regex_string, regex_string); ++ return node->pattern; ++} ++ ++#if CONFIG_IP_NF_MATCH_LAYER7_DEBUG ++/* Converts an unfriendly string into a friendly one by ++replacing unprintables with periods and all whitespace with " ". */ ++static char * friendly_print(unsigned char * s) ++{ ++ char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC); ++ int i; ++ ++ if(!f) { ++ printk(KERN_ERR "layer7: out of memory in friendly_print, bailing.\n"); ++ return NULL; ++ } ++ ++ for(i = 0; i < strlen(s); i++){ ++ if(isprint(s[i]) && s[i] < 128) f[i] = s[i]; ++ else if(isspace(s[i])) f[i] = ' '; ++ else f[i] = '.'; ++ } ++ f[i] = '\0'; ++ return f; ++} ++ ++static char dec2hex(int i) ++{ ++ switch (i) { ++ case 0 ... 9: ++ return (char)(i + '0'); ++ break; ++ case 10 ... 15: ++ return (char)(i - 10 + 'a'); ++ break; ++ default: ++ printk("Problem in dec2hex\n"); ++ return '\0'; ++ } ++} ++ ++static char * hex_print(unsigned char * s) ++{ ++ char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC); ++ int i; ++ ++ if(!g) { ++ printk(KERN_ERR "layer7: out of memory in hex_print, bailing.\n"); ++ return NULL; ++ } ++ ++ for(i = 0; i < strlen(s); i++) { ++ g[i*3 ] = dec2hex(s[i]/16); ++ g[i*3 + 1] = dec2hex(s[i]%16); ++ g[i*3 + 2] = ' '; ++ } ++ g[i*3] = '\0'; ++ ++ return g; ++} ++#endif // DEBUG ++ ++ ++/* The following functions are here in case we get ported into an environment ++(ebtables?) where skb->nh.iph->protocol isn't set. They assume that skb->data ++points at the beginning of the IP datagram, which is true for iptables (but in ++QoS it points to the beginning of the Ethernet frame). */ ++#if 0 ++#define IP_PROTO_OFFSET 9 ++static int is_tcp_over_ipv4 (const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_TCP );} ++static int is_udp_over_ipv4 (const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_UDP );} ++static int is_icmp_over_ipv4(const struct sk_buff *skb){return(skb->data[IP_PROTO_OFFSET]==IPPROTO_ICMP);} ++#endif ++ ++static int can_handle(const struct sk_buff *skb) ++{ ++ if(!skb->nh.iph) /* not IP */ ++ return 0; ++ if(skb->nh.iph->protocol != IPPROTO_TCP && ++ skb->nh.iph->protocol != IPPROTO_UDP && ++ skb->nh.iph->protocol != IPPROTO_ICMP) ++ return 0; ++ return 1; ++} ++ ++/* Returns offset the into the skb->data that the application data starts */ ++static int app_data_offset(const struct sk_buff *skb) ++{ ++ /* In case we are ported somewhere (ebtables?) where skb->nh.iph ++ isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */ ++ int ip_hl = 4*skb->nh.iph->ihl; ++ ++ if( skb->nh.iph->protocol == IPPROTO_TCP ) { ++ /* 12 == offset into TCP header for the header length field. ++ Can't get this with skb->h.th->doff because the tcphdr ++ struct doesn't get set when routing (this is confirmed to be ++ true in Netfilter as well as QoS.) */ ++ int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4); ++ ++ return ip_hl + tcp_hl; ++ } else if( skb->nh.iph->protocol == IPPROTO_UDP ) { ++ return ip_hl + 8; /* UDP header is always 8 bytes */ ++ } else if( skb->nh.iph->protocol == IPPROTO_ICMP ) { ++ return ip_hl + 8; /* ICMP header is 8 bytes */ ++ } else { ++ printk(KERN_ERR "layer7: tried to handle unknown protocol!\n"); ++ return ip_hl + 8; /* something reasonable */ ++ } ++} ++ ++/* handles whether there's a match when we aren't appending data anymore */ ++static int match_no_append(struct ip_conntrack * conntrack, ++ struct ip_conntrack * master_conntrack, ++ struct ipt_layer7_info * info) ++{ ++ /* If we're in here, we don't care about the app data anymore */ ++ WRITE_LOCK(&ct_lock); ++ if(master_conntrack->layer7.app_data != NULL) { ++ ++ #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG ++ if(!master_conntrack->layer7.app_proto) { ++ char * f = friendly_print(master_conntrack->layer7.app_data); ++ char * g = hex_print(master_conntrack->layer7.app_data); ++ DPRINTK("\nGave up on the %d length stream: \n%s\n", ++ master_conntrack->layer7.app_data_len, f); ++ DPRINTK("\nIn hex: %s\n", g); ++ kfree(f); ++ kfree(g); ++ } ++ #endif ++ ++ kfree(master_conntrack->layer7.app_data); ++ master_conntrack->layer7.app_data = NULL; /* don't free again */ ++ } ++ WRITE_UNLOCK(&ct_lock); ++ ++ /* Is top-level master (possibly self) classified? */ ++ if(master_conntrack->layer7.app_proto) { ++ if(!strcmp(master_conntrack->layer7.app_proto, info->protocol)) ++ { ++ /* set own .protocol (for /proc/net/ip_conntrack) */ ++ WRITE_LOCK(&ct_lock); ++ if(!conntrack->layer7.app_proto) { ++ conntrack->layer7.app_proto = kmalloc(strlen(info->protocol), GFP_ATOMIC); ++ if(!conntrack->layer7.app_proto){ ++ printk(KERN_ERR "layer7: out of memory in match_no_append, bailing.\n"); ++ WRITE_UNLOCK(&ct_lock); ++ return 1; ++ } ++ ++ strcpy(conntrack->layer7.app_proto, info->protocol); ++ } ++ WRITE_UNLOCK(&ct_lock); ++ ++ return 1; ++ } else return 0; ++ } else return 0; /* no clasification */ ++} ++ ++/* add the new app data to the conntrack. Return number of bytes added. */ ++static int add_data(struct ip_conntrack * master_conntrack, ++ char * app_data, int appdatalen) ++{ ++ int length = 0, i; ++ int oldlength = master_conntrack->layer7.app_data_len; ++ ++ /* Strip nulls. Make everything lower case (our regex lib doesn't ++ do case insensitivity). Add it to the end of the current data. */ ++ for(i = 0; i < CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN-oldlength-1 && ++ i < appdatalen; i++) { ++ if(app_data[i] != '\0') { ++ master_conntrack->layer7.app_data[length+oldlength] = ++ /* the kernel version of tolower mungs 'upper ascii' */ ++ isascii(app_data[i])? tolower(app_data[i]) : app_data[i]; ++ length++; ++ } ++ } ++ ++ master_conntrack->layer7.app_data[length+oldlength] = '\0'; ++ master_conntrack->layer7.app_data_len = length + oldlength; ++ ++ return length; ++} ++ ++/* Returns true on match and false otherwise. */ ++static int match(/* const */struct sk_buff *skb, const struct net_device *in, ++ const struct net_device *out, const void *matchinfo, ++ int offset, int *hotdrop) ++{ ++ struct ipt_layer7_info * info = (struct ipt_layer7_info *)matchinfo; ++ enum ip_conntrack_info master_ctinfo, ctinfo; ++ struct ip_conntrack *master_conntrack, *conntrack; ++ unsigned char * app_data; ++ unsigned int pattern_result, appdatalen; ++ regexp * comppattern; ++ ++ if(!can_handle(skb)){ ++ DPRINTK("layer7: This is some protocol I can't handle\n"); ++ return info->invert; ++ } ++ ++ LOCK_BH(&list_lock); ++ comppattern = compile_and_cache(info->pattern, info->protocol); ++ UNLOCK_BH(&list_lock); ++ /* the return value gets checked later, when we're ready to use it */ ++ ++ app_data = skb->data + app_data_offset(skb); ++ appdatalen = skb->tail - app_data; ++ ++ /* Treat the parent and all its children together as one connection, ++ except for the purpose of setting conntrack->layer7.pattern in the ++ actual connection. This makes /proc/net/ip_conntrack somewhat more ++ satisfying. */ ++ if(!(conntrack = ip_conntrack_get((struct sk_buff *)skb, &ctinfo)) || ++ !(master_conntrack = ip_conntrack_get((struct sk_buff *)skb, &master_ctinfo))) { ++ DPRINTK("layer7: packet is not from a known connection, giving up.\n"); ++ return info->invert; ++ } ++ ++ /* Try to get a master conntrack (and its master etc) for FTP, etc. */ ++ while (master_ct(master_conntrack) != NULL) ++ master_conntrack = master_ct(master_conntrack); ++ ++ /* skb->cb[0] == seen. Avoid doing things twice if there are two layer7 ++ rules. I'm not sure that using cb for this purpose is correct, although ++ it says "put your private variables there" and this seems to qualify. ++ But it doesn't look like it's being used for anything else in the ++ sk_buffs that make it here. I'm open to suggestions for how to be able ++ to write to cb without making the compiler angry. That I can't figure ++ this out is an argument against this being correct. */ ++ if(!skb->cb[0]){ ++ WRITE_LOCK(&ct_lock); ++ master_conntrack->layer7.numpackets++;/*starts at 0 via memset*/ ++ WRITE_UNLOCK(&ct_lock); ++ } ++ ++ /* On the first packet of a connection, allocate space for app data */ ++ WRITE_LOCK(&ct_lock); ++ if(master_conntrack->layer7.numpackets == 1 && !skb->cb[0]) { ++ master_conntrack->layer7.app_data = kmalloc(CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN, GFP_ATOMIC); ++ if(!master_conntrack->layer7.app_data){ ++ printk(KERN_ERR "layer7: out of memory in match, bailing.\n"); ++ WRITE_UNLOCK(&ct_lock); ++ return info->invert; ++ } ++ ++ master_conntrack->layer7.app_data[0] = '\0'; ++ } ++ WRITE_UNLOCK(&ct_lock); ++ ++ /* if we've classified it or seen too many packets */ ++ if(master_conntrack->layer7.numpackets > num_packets || ++ master_conntrack->layer7.app_proto) { ++ ++ pattern_result = match_no_append(conntrack, master_conntrack, info); ++ ++ /* mark the packet seen (probably irrelevant, but consistant) */ ++ skb->cb[0] = 1; ++ ++ return (pattern_result ^ info->invert); ++ } ++ ++ /* Can end up here, but unallocated, if numpackets is increased during ++ the beginning of a connection */ ++ if(master_conntrack->layer7.app_data == NULL) ++ return (info->invert); /* unmatched */ ++ ++ if(!skb->cb[0]) { ++ int newbytes; ++ WRITE_LOCK(&ct_lock); ++ newbytes = add_data(master_conntrack, app_data, appdatalen); ++ WRITE_UNLOCK(&ct_lock); ++ ++ if(newbytes == 0) { /* didn't add any data */ ++ skb->cb[0] = 1; ++ /* Didn't match before, not going to match now */ ++ return info->invert; ++ } ++ } ++ ++ /* If the regexp failed to compile, don't bother running it */ ++ if(comppattern && regexec(comppattern, master_conntrack->layer7.app_data)) { ++ DPRINTK("layer7: regexec positive: %s!\n", info->protocol); ++ pattern_result = 1; ++ } else pattern_result = 0; ++ ++ if(pattern_result) { ++ WRITE_LOCK(&ct_lock); ++ conntrack->layer7.app_proto = kmalloc(strlen(info->protocol), GFP_ATOMIC); ++ if(!conntrack->layer7.app_proto){ ++ printk(KERN_ERR "layer7: out of memory in match, bailing.\n"); ++ WRITE_UNLOCK(&ct_lock); ++ return (pattern_result ^ info->invert); ++ } ++ ++ strcpy(conntrack->layer7.app_proto, info->protocol); ++ WRITE_UNLOCK(&ct_lock); ++ } ++ ++ /* mark the packet seen */ ++ skb->cb[0] = 1; ++ ++ return (pattern_result ^ info->invert); ++} ++ ++static int checkentry(const char *tablename, const struct ipt_ip *ip, ++ void *matchinfo, unsigned int matchsize, unsigned int hook_mask) ++{ ++ if (matchsize != IPT_ALIGN(sizeof(struct ipt_layer7_info))) ++ return 0; ++ return 1; ++} ++ ++static struct ipt_match layer7_match = { ++ .name = "layer7", ++ .match = &match, ++ .checkentry = &checkentry, ++ .me = THIS_MODULE ++}; ++ ++/* taken from drivers/video/modedb.c */ ++static int my_atoi(const char *s) ++{ ++ int val = 0; ++ ++ for (;; s++) { ++ switch (*s) { ++ case '0'...'9': ++ val = 10*val+(*s-'0'); ++ break; ++ default: ++ return val; ++ } ++ } ++} ++ ++/* write out num_packets to userland. */ ++static int layer7_read_proc(char* page, char ** start, off_t off, int count, ++ int* eof, void * data) ++{ ++ if(num_packets > 99) ++ printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n"); ++ ++ page[0] = num_packets/10 + '0'; ++ page[1] = num_packets%10 + '0'; ++ page[2] = '\n'; ++ page[3] = '\0'; ++ ++ *eof=1; ++ ++ return 3; ++} ++ ++/* Read in num_packets from userland */ ++static int layer7_write_proc(struct file* file, const char* buffer, ++ unsigned long count, void *data) ++{ ++ char * foo = kmalloc(count, GFP_ATOMIC); ++ ++ if(!foo){ ++ printk(KERN_ERR "layer7: out of memory, bailing. num_packets unchanged.\n"); ++ return count; ++ } ++ ++ /* copy in the data from userland */ ++ copy_from_user(foo, buffer, count); ++ ++ num_packets = my_atoi(foo); ++ kfree (foo); ++ ++ /* This has an arbitrary limit to make the math easier. I'm lazy. ++ But anyway, 99 is a LOT! If you want more, you're doing it wrong! */ ++ if(num_packets > 99) { ++ printk(KERN_WARNING "layer7: num_packets can't be > 99.\n"); ++ num_packets = 99; ++ } else if(num_packets < 1) { ++ printk(KERN_WARNING "layer7: num_packets can't be < 1.\n"); ++ num_packets = 1; ++ } ++ ++ return count; ++} ++ ++/* register the proc file */ ++static void layer7_init_proc(void) ++{ ++ struct proc_dir_entry* entry; ++ ++ /* create the file */ ++ entry = create_proc_entry("layer7_numpackets", 0644, proc_net); ++ ++ /* set the callback functions */ ++ entry->read_proc = layer7_read_proc; ++ entry->write_proc = layer7_write_proc; ++} ++ ++static void layer7_cleanup_proc(void) ++{ ++ remove_proc_entry("layer7_numpackets", proc_net); ++} ++ ++static int __init init(void) ++{ ++ layer7_init_proc(); ++ return ipt_register_match(&layer7_match); ++} ++ ++static void __exit fini(void) ++{ ++ layer7_cleanup_proc(); ++ ipt_unregister_match(&layer7_match); ++} ++ ++module_init(init); ++module_exit(fini); +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.c +--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.c 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.c 2004-06-27 19:07:00.000000000 -0500 +@@ -0,0 +1,1195 @@ ++/* ++ * regcomp and regexec -- regsub and regerror are elsewhere ++ * @(#)regexp.c 1.3 of 18 April 87 ++ * ++ * Copyright (c) 1986 by University of Toronto. ++ * Written by Henry Spencer. Not derived from licensed software. ++ * ++ * Permission is granted to anyone to use this software for any ++ * purpose on any computer system, and to redistribute it freely, ++ * subject to the following restrictions: ++ * ++ * 1. The author is not responsible for the consequences of use of ++ * this software, no matter how awful, even if they arise ++ * from defects in it. ++ * ++ * 2. The origin of this software must not be misrepresented, either ++ * by explicit claim or by omission. ++ * ++ * 3. Altered versions must be plainly marked as such, and must not ++ * be misrepresented as being the original software. ++ * ++ * Beware that some of this code is subtly aware of the way operator ++ * precedence is structured in regular expressions. Serious changes in ++ * regular-expression syntax might require a total rethink. ++ * ++ * This code was modified by Ethan Sommer to work within the kernel ++ * (it now uses kmalloc etc..) ++ * ++ * Modified slightly by Matthew Strait to use more modern C. ++ */ ++ ++#include "regexp.h" ++#include "regmagic.h" ++ ++/* added by ethan and matt. Lets it work in both kernel and user space. ++(So iptables can use it, for instance.) Yea, it goes both ways... */ ++#if __KERNEL__ ++ #define malloc(foo) kmalloc(foo,GFP_ATOMIC) ++#else ++ #define printk(format,args...) printf(format,##args) ++#endif ++ ++void regerror(char * s) ++{ ++ printk("<3>Regexp: %s\n", s); ++ /* NOTREACHED */ ++} ++ ++/* ++ * The "internal use only" fields in regexp.h are present to pass info from ++ * compile to execute that permits the execute phase to run lots faster on ++ * simple cases. They are: ++ * ++ * regstart char that must begin a match; '\0' if none obvious ++ * reganch is the match anchored (at beginning-of-line only)? ++ * regmust string (pointer into program) that match must include, or NULL ++ * regmlen length of regmust string ++ * ++ * Regstart and reganch permit very fast decisions on suitable starting points ++ * for a match, cutting down the work a lot. Regmust permits fast rejection ++ * of lines that cannot possibly match. The regmust tests are costly enough ++ * that regcomp() supplies a regmust only if the r.e. contains something ++ * potentially expensive (at present, the only such thing detected is * or + ++ * at the start of the r.e., which can involve a lot of backup). Regmlen is ++ * supplied because the test in regexec() needs it and regcomp() is computing ++ * it anyway. ++ */ ++ ++/* ++ * Structure for regexp "program". This is essentially a linear encoding ++ * of a nondeterministic finite-state machine (aka syntax charts or ++ * "railroad normal form" in parsing technology). Each node is an opcode ++ * plus a "next" pointer, possibly plus an operand. "Next" pointers of ++ * all nodes except BRANCH implement concatenation; a "next" pointer with ++ * a BRANCH on both ends of it is connecting two alternatives. (Here we ++ * have one of the subtle syntax dependencies: an individual BRANCH (as ++ * opposed to a collection of them) is never concatenated with anything ++ * because of operator precedence.) The operand of some types of node is ++ * a literal string; for others, it is a node leading into a sub-FSM. In ++ * particular, the operand of a BRANCH node is the first node of the branch. ++ * (NB this is *not* a tree structure: the tail of the branch connects ++ * to the thing following the set of BRANCHes.) The opcodes are: ++ */ ++ ++/* definition number opnd? meaning */ ++#define END 0 /* no End of program. */ ++#define BOL 1 /* no Match "" at beginning of line. */ ++#define EOL 2 /* no Match "" at end of line. */ ++#define ANY 3 /* no Match any one character. */ ++#define ANYOF 4 /* str Match any character in this string. */ ++#define ANYBUT 5 /* str Match any character not in this string. */ ++#define BRANCH 6 /* node Match this alternative, or the next... */ ++#define BACK 7 /* no Match "", "next" ptr points backward. */ ++#define EXACTLY 8 /* str Match this string. */ ++#define NOTHING 9 /* no Match empty string. */ ++#define STAR 10 /* node Match this (simple) thing 0 or more times. */ ++#define PLUS 11 /* node Match this (simple) thing 1 or more times. */ ++#define OPEN 20 /* no Mark this point in input as start of #n. */ ++ /* OPEN+1 is number 1, etc. */ ++#define CLOSE 30 /* no Analogous to OPEN. */ ++ ++/* ++ * Opcode notes: ++ * ++ * BRANCH The set of branches constituting a single choice are hooked ++ * together with their "next" pointers, since precedence prevents ++ * anything being concatenated to any individual branch. The ++ * "next" pointer of the last BRANCH in a choice points to the ++ * thing following the whole choice. This is also where the ++ * final "next" pointer of each individual branch points; each ++ * branch starts with the operand node of a BRANCH node. ++ * ++ * BACK Normal "next" pointers all implicitly point forward; BACK ++ * exists to make loop structures possible. ++ * ++ * STAR,PLUS '?', and complex '*' and '+', are implemented as circular ++ * BRANCH structures using BACK. Simple cases (one character ++ * per match) are implemented with STAR and PLUS for speed ++ * and to minimize recursive plunges. ++ * ++ * OPEN,CLOSE ...are numbered at compile time. ++ */ ++ ++/* ++ * A node is one char of opcode followed by two chars of "next" pointer. ++ * "Next" pointers are stored as two 8-bit pieces, high order first. The ++ * value is a positive offset from the opcode of the node containing it. ++ * An operand, if any, simply follows the node. (Note that much of the ++ * code generation knows about this implicit relationship.) ++ * ++ * Using two bytes for the "next" pointer is vast overkill for most things, ++ * but allows patterns to get big without disasters. ++ */ ++#define OP(p) (*(p)) ++#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377)) ++#define OPERAND(p) ((p) + 3) ++ ++/* ++ * See regmagic.h for one further detail of program structure. ++ */ ++ ++ ++/* ++ * Utility definitions. ++ */ ++#ifndef CHARBITS ++#define UCHARAT(p) ((int)*(unsigned char *)(p)) ++#else ++#define UCHARAT(p) ((int)*(p)&CHARBITS) ++#endif ++ ++#define FAIL(m) { regerror(m); return(NULL); } ++#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?') ++#define META "^$.[()|?+*\\" ++ ++/* ++ * Flags to be passed up and down. ++ */ ++#define HASWIDTH 01 /* Known never to match null string. */ ++#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */ ++#define SPSTART 04 /* Starts with * or +. */ ++#define WORST 0 /* Worst case. */ ++ ++/* ++ * Global work variables for regcomp(). ++ */ ++static char *regparse; /* Input-scan pointer. */ ++static int regnpar; /* () count. */ ++static char regdummy; ++static char *regcode; /* Code-emit pointer; ®dummy = don't. */ ++static long regsize; /* Code size. */ ++ ++/* ++ * Forward declarations for regcomp()'s friends. ++ */ ++#ifndef STATIC ++#define STATIC static ++#endif ++STATIC char *reg(int paren,int *flagp); ++STATIC char *regbranch(int *flagp); ++STATIC char *regpiece(int *flagp); ++STATIC char *regatom(int *flagp); ++STATIC char *regnode(char op); ++STATIC char *regnext(char *p); ++STATIC void regc(char b); ++STATIC void reginsert(char op, char *opnd); ++STATIC void regtail(char *p, char *val); ++STATIC void regoptail(char *p, char *val); ++ ++ ++__kernel_size_t my_strcspn(const char *s1,const char *s2) ++{ ++ char *scan1; ++ char *scan2; ++ int count; ++ ++ count = 0; ++ for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) { ++ for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */ ++ if (*scan1 == *scan2++) ++ return(count); ++ count++; ++ } ++ return(count); ++} ++ ++/* ++ - regcomp - compile a regular expression into internal code ++ * ++ * We can't allocate space until we know how big the compiled form will be, ++ * but we can't compile it (and thus know how big it is) until we've got a ++ * place to put the code. So we cheat: we compile it twice, once with code ++ * generation turned off and size counting turned on, and once "for real". ++ * This also means that we don't allocate space until we are sure that the ++ * thing really will compile successfully, and we never have to move the ++ * code and thus invalidate pointers into it. (Note that it has to be in ++ * one piece because free() must be able to free it all.) ++ * ++ * Beware that the optimization-preparation code in here knows about some ++ * of the structure of the compiled regexp. ++ */ ++regexp * ++regcomp(char *exp,int *patternsize) ++{ ++ register regexp *r; ++ register char *scan; ++ register char *longest; ++ register int len; ++ int flags; ++ /* commented out by ethan ++ extern char *malloc(); ++ */ ++ ++ if (exp == NULL) ++ FAIL("NULL argument"); ++ ++ /* First pass: determine size, legality. */ ++ regparse = exp; ++ regnpar = 1; ++ regsize = 0L; ++ regcode = ®dummy; ++ regc(MAGIC); ++ if (reg(0, &flags) == NULL) ++ return(NULL); ++ ++ /* Small enough for pointer-storage convention? */ ++ if (regsize >= 32767L) /* Probably could be 65535L. */ ++ FAIL("regexp too big"); ++ ++ /* Allocate space. */ ++ *patternsize=sizeof(regexp) + (unsigned)regsize; ++ r = (regexp *)malloc(sizeof(regexp) + (unsigned)regsize); ++ if (r == NULL) ++ FAIL("out of space"); ++ ++ /* Second pass: emit code. */ ++ regparse = exp; ++ regnpar = 1; ++ regcode = r->program; ++ regc(MAGIC); ++ if (reg(0, &flags) == NULL) ++ return(NULL); ++ ++ /* Dig out information for optimizations. */ ++ r->regstart = '\0'; /* Worst-case defaults. */ ++ r->reganch = 0; ++ r->regmust = NULL; ++ r->regmlen = 0; ++ scan = r->program+1; /* First BRANCH. */ ++ if (OP(regnext(scan)) == END) { /* Only one top-level choice. */ ++ scan = OPERAND(scan); ++ ++ /* Starting-point info. */ ++ if (OP(scan) == EXACTLY) ++ r->regstart = *OPERAND(scan); ++ else if (OP(scan) == BOL) ++ r->reganch++; ++ ++ /* ++ * If there's something expensive in the r.e., find the ++ * longest literal string that must appear and make it the ++ * regmust. Resolve ties in favor of later strings, since ++ * the regstart check works with the beginning of the r.e. ++ * and avoiding duplication strengthens checking. Not a ++ * strong reason, but sufficient in the absence of others. ++ */ ++ if (flags&SPSTART) { ++ longest = NULL; ++ len = 0; ++ for (; scan != NULL; scan = regnext(scan)) ++ if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) { ++ longest = OPERAND(scan); ++ len = strlen(OPERAND(scan)); ++ } ++ r->regmust = longest; ++ r->regmlen = len; ++ } ++ } ++ ++ return(r); ++} ++ ++/* ++ - reg - regular expression, i.e. main body or parenthesized thing ++ * ++ * Caller must absorb opening parenthesis. ++ * ++ * Combining parenthesis handling with the base level of regular expression ++ * is a trifle forced, but the need to tie the tails of the branches to what ++ * follows makes it hard to avoid. ++ */ ++static char * ++reg(int paren, int *flagp /* Parenthesized? */ ) ++{ ++ register char *ret; ++ register char *br; ++ register char *ender; ++ register int parno = 0; /* 0 makes gcc happy */ ++ int flags; ++ ++ *flagp = HASWIDTH; /* Tentatively. */ ++ ++ /* Make an OPEN node, if parenthesized. */ ++ if (paren) { ++ if (regnpar >= NSUBEXP) ++ FAIL("too many ()"); ++ parno = regnpar; ++ regnpar++; ++ ret = regnode(OPEN+parno); ++ } else ++ ret = NULL; ++ ++ /* Pick up the branches, linking them together. */ ++ br = regbranch(&flags); ++ if (br == NULL) ++ return(NULL); ++ if (ret != NULL) ++ regtail(ret, br); /* OPEN -> first. */ ++ else ++ ret = br; ++ if (!(flags&HASWIDTH)) ++ *flagp &= ~HASWIDTH; ++ *flagp |= flags&SPSTART; ++ while (*regparse == '|') { ++ regparse++; ++ br = regbranch(&flags); ++ if (br == NULL) ++ return(NULL); ++ regtail(ret, br); /* BRANCH -> BRANCH. */ ++ if (!(flags&HASWIDTH)) ++ *flagp &= ~HASWIDTH; ++ *flagp |= flags&SPSTART; ++ } ++ ++ /* Make a closing node, and hook it on the end. */ ++ ender = regnode((paren) ? CLOSE+parno : END); ++ regtail(ret, ender); ++ ++ /* Hook the tails of the branches to the closing node. */ ++ for (br = ret; br != NULL; br = regnext(br)) ++ regoptail(br, ender); ++ ++ /* Check for proper termination. */ ++ if (paren && *regparse++ != ')') { ++ FAIL("unmatched ()"); ++ } else if (!paren && *regparse != '\0') { ++ if (*regparse == ')') { ++ FAIL("unmatched ()"); ++ } else ++ FAIL("junk on end"); /* "Can't happen". */ ++ /* NOTREACHED */ ++ } ++ ++ return(ret); ++} ++ ++/* ++ - regbranch - one alternative of an | operator ++ * ++ * Implements the concatenation operator. ++ */ ++static char * ++regbranch(int *flagp) ++{ ++ register char *ret; ++ register char *chain; ++ register char *latest; ++ int flags; ++ ++ *flagp = WORST; /* Tentatively. */ ++ ++ ret = regnode(BRANCH); ++ chain = NULL; ++ while (*regparse != '\0' && *regparse != '|' && *regparse != ')') { ++ latest = regpiece(&flags); ++ if (latest == NULL) ++ return(NULL); ++ *flagp |= flags&HASWIDTH; ++ if (chain == NULL) /* First piece. */ ++ *flagp |= flags&SPSTART; ++ else ++ regtail(chain, latest); ++ chain = latest; ++ } ++ if (chain == NULL) /* Loop ran zero times. */ ++ (void) regnode(NOTHING); ++ ++ return(ret); ++} ++ ++/* ++ - regpiece - something followed by possible [*+?] ++ * ++ * Note that the branching code sequences used for ? and the general cases ++ * of * and + are somewhat optimized: they use the same NOTHING node as ++ * both the endmarker for their branch list and the body of the last branch. ++ * It might seem that this node could be dispensed with entirely, but the ++ * endmarker role is not redundant. ++ */ ++static char * ++regpiece(int *flagp) ++{ ++ register char *ret; ++ register char op; ++ register char *next; ++ int flags; ++ ++ ret = regatom(&flags); ++ if (ret == NULL) ++ return(NULL); ++ ++ op = *regparse; ++ if (!ISMULT(op)) { ++ *flagp = flags; ++ return(ret); ++ } ++ ++ if (!(flags&HASWIDTH) && op != '?') ++ FAIL("*+ operand could be empty"); ++ *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH); ++ ++ if (op == '*' && (flags&SIMPLE)) ++ reginsert(STAR, ret); ++ else if (op == '*') { ++ /* Emit x* as (x&|), where & means "self". */ ++ reginsert(BRANCH, ret); /* Either x */ ++ regoptail(ret, regnode(BACK)); /* and loop */ ++ regoptail(ret, ret); /* back */ ++ regtail(ret, regnode(BRANCH)); /* or */ ++ regtail(ret, regnode(NOTHING)); /* null. */ ++ } else if (op == '+' && (flags&SIMPLE)) ++ reginsert(PLUS, ret); ++ else if (op == '+') { ++ /* Emit x+ as x(&|), where & means "self". */ ++ next = regnode(BRANCH); /* Either */ ++ regtail(ret, next); ++ regtail(regnode(BACK), ret); /* loop back */ ++ regtail(next, regnode(BRANCH)); /* or */ ++ regtail(ret, regnode(NOTHING)); /* null. */ ++ } else if (op == '?') { ++ /* Emit x? as (x|) */ ++ reginsert(BRANCH, ret); /* Either x */ ++ regtail(ret, regnode(BRANCH)); /* or */ ++ next = regnode(NOTHING); /* null. */ ++ regtail(ret, next); ++ regoptail(ret, next); ++ } ++ regparse++; ++ if (ISMULT(*regparse)) ++ FAIL("nested *?+"); ++ ++ return(ret); ++} ++ ++/* ++ - regatom - the lowest level ++ * ++ * Optimization: gobbles an entire sequence of ordinary characters so that ++ * it can turn them into a single node, which is smaller to store and ++ * faster to run. Backslashed characters are exceptions, each becoming a ++ * separate node; the code is simpler that way and it's not worth fixing. ++ */ ++static char * ++regatom(int *flagp) ++{ ++ register char *ret; ++ int flags; ++ ++ *flagp = WORST; /* Tentatively. */ ++ ++ switch (*regparse++) { ++ case '^': ++ ret = regnode(BOL); ++ break; ++ case '$': ++ ret = regnode(EOL); ++ break; ++ case '.': ++ ret = regnode(ANY); ++ *flagp |= HASWIDTH|SIMPLE; ++ break; ++ case '[': { ++ register int class; ++ register int classend; ++ ++ if (*regparse == '^') { /* Complement of range. */ ++ ret = regnode(ANYBUT); ++ regparse++; ++ } else ++ ret = regnode(ANYOF); ++ if (*regparse == ']' || *regparse == '-') ++ regc(*regparse++); ++ while (*regparse != '\0' && *regparse != ']') { ++ if (*regparse == '-') { ++ regparse++; ++ if (*regparse == ']' || *regparse == '\0') ++ regc('-'); ++ else { ++ class = UCHARAT(regparse-2)+1; ++ classend = UCHARAT(regparse); ++ if (class > classend+1) ++ FAIL("invalid [] range"); ++ for (; class <= classend; class++) ++ regc(class); ++ regparse++; ++ } ++ } else ++ regc(*regparse++); ++ } ++ regc('\0'); ++ if (*regparse != ']') ++ FAIL("unmatched []"); ++ regparse++; ++ *flagp |= HASWIDTH|SIMPLE; ++ } ++ break; ++ case '(': ++ ret = reg(1, &flags); ++ if (ret == NULL) ++ return(NULL); ++ *flagp |= flags&(HASWIDTH|SPSTART); ++ break; ++ case '\0': ++ case '|': ++ case ')': ++ FAIL("internal urp"); /* Supposed to be caught earlier. */ ++ break; ++ case '?': ++ case '+': ++ case '*': ++ FAIL("?+* follows nothing"); ++ break; ++ case '\\': ++ if (*regparse == '\0') ++ FAIL("trailing \\"); ++ ret = regnode(EXACTLY); ++ regc(*regparse++); ++ regc('\0'); ++ *flagp |= HASWIDTH|SIMPLE; ++ break; ++ default: { ++ register int len; ++ register char ender; ++ ++ regparse--; ++ len = my_strcspn((const char *)regparse, (const char *)META); ++ if (len <= 0) ++ FAIL("internal disaster"); ++ ender = *(regparse+len); ++ if (len > 1 && ISMULT(ender)) ++ len--; /* Back off clear of ?+* operand. */ ++ *flagp |= HASWIDTH; ++ if (len == 1) ++ *flagp |= SIMPLE; ++ ret = regnode(EXACTLY); ++ while (len > 0) { ++ regc(*regparse++); ++ len--; ++ } ++ regc('\0'); ++ } ++ break; ++ } ++ ++ return(ret); ++} ++ ++/* ++ - regnode - emit a node ++ */ ++static char * /* Location. */ ++regnode(char op) ++{ ++ register char *ret; ++ register char *ptr; ++ ++ ret = regcode; ++ if (ret == ®dummy) { ++ regsize += 3; ++ return(ret); ++ } ++ ++ ptr = ret; ++ *ptr++ = op; ++ *ptr++ = '\0'; /* Null "next" pointer. */ ++ *ptr++ = '\0'; ++ regcode = ptr; ++ ++ return(ret); ++} ++ ++/* ++ - regc - emit (if appropriate) a byte of code ++ */ ++static void ++regc(char b) ++{ ++ if (regcode != ®dummy) ++ *regcode++ = b; ++ else ++ regsize++; ++} ++ ++/* ++ - reginsert - insert an operator in front of already-emitted operand ++ * ++ * Means relocating the operand. ++ */ ++static void ++reginsert(char op, char* opnd) ++{ ++ register char *src; ++ register char *dst; ++ register char *place; ++ ++ if (regcode == ®dummy) { ++ regsize += 3; ++ return; ++ } ++ ++ src = regcode; ++ regcode += 3; ++ dst = regcode; ++ while (src > opnd) ++ *--dst = *--src; ++ ++ place = opnd; /* Op node, where operand used to be. */ ++ *place++ = op; ++ *place++ = '\0'; ++ *place++ = '\0'; ++} ++ ++/* ++ - regtail - set the next-pointer at the end of a node chain ++ */ ++static void ++regtail(char *p, char *val) ++{ ++ register char *scan; ++ register char *temp; ++ register int offset; ++ ++ if (p == ®dummy) ++ return; ++ ++ /* Find last node. */ ++ scan = p; ++ for (;;) { ++ temp = regnext(scan); ++ if (temp == NULL) ++ break; ++ scan = temp; ++ } ++ ++ if (OP(scan) == BACK) ++ offset = scan - val; ++ else ++ offset = val - scan; ++ *(scan+1) = (offset>>8)&0377; ++ *(scan+2) = offset&0377; ++} ++ ++/* ++ - regoptail - regtail on operand of first argument; nop if operandless ++ */ ++static void ++regoptail(char *p, char *val) ++{ ++ /* "Operandless" and "op != BRANCH" are synonymous in practice. */ ++ if (p == NULL || p == ®dummy || OP(p) != BRANCH) ++ return; ++ regtail(OPERAND(p), val); ++} ++ ++/* ++ * regexec and friends ++ */ ++ ++/* ++ * Global work variables for regexec(). ++ */ ++static char *reginput; /* String-input pointer. */ ++static char *regbol; /* Beginning of input, for ^ check. */ ++static char **regstartp; /* Pointer to startp array. */ ++static char **regendp; /* Ditto for endp. */ ++ ++/* ++ * Forwards. ++ */ ++STATIC int regtry(regexp *prog, char *string); ++STATIC int regmatch(char *prog); ++STATIC int regrepeat(char *p); ++ ++#ifdef DEBUG ++int regnarrate = 0; ++void regdump(); ++STATIC char *regprop(char *op); ++#endif ++ ++/* ++ - regexec - match a regexp against a string ++ */ ++int ++regexec(regexp *prog, char *string) ++{ ++ register char *s; ++ ++ /* Be paranoid... */ ++ if (prog == NULL || string == NULL) { ++ printk("<3>Regexp: NULL parameter\n"); ++ return(0); ++ } ++ ++ /* Check validity of program. */ ++ if (UCHARAT(prog->program) != MAGIC) { ++ printk("<3>Regexp: corrupted program\n"); ++ return(0); ++ } ++ ++ /* If there is a "must appear" string, look for it. */ ++ if (prog->regmust != NULL) { ++ s = string; ++ while ((s = strchr(s, prog->regmust[0])) != NULL) { ++ if (strncmp(s, prog->regmust, prog->regmlen) == 0) ++ break; /* Found it. */ ++ s++; ++ } ++ if (s == NULL) /* Not present. */ ++ return(0); ++ } ++ ++ /* Mark beginning of line for ^ . */ ++ regbol = string; ++ ++ /* Simplest case: anchored match need be tried only once. */ ++ if (prog->reganch) ++ return(regtry(prog, string)); ++ ++ /* Messy cases: unanchored match. */ ++ s = string; ++ if (prog->regstart != '\0') ++ /* We know what char it must start with. */ ++ while ((s = strchr(s, prog->regstart)) != NULL) { ++ if (regtry(prog, s)) ++ return(1); ++ s++; ++ } ++ else ++ /* We don't -- general case. */ ++ do { ++ if (regtry(prog, s)) ++ return(1); ++ } while (*s++ != '\0'); ++ ++ /* Failure. */ ++ return(0); ++} ++ ++/* ++ - regtry - try match at specific point ++ */ ++static int /* 0 failure, 1 success */ ++regtry(regexp *prog, char *string) ++{ ++ register int i; ++ register char **sp; ++ register char **ep; ++ ++ reginput = string; ++ regstartp = prog->startp; ++ regendp = prog->endp; ++ ++ sp = prog->startp; ++ ep = prog->endp; ++ for (i = NSUBEXP; i > 0; i--) { ++ *sp++ = NULL; ++ *ep++ = NULL; ++ } ++ if (regmatch(prog->program + 1)) { ++ prog->startp[0] = string; ++ prog->endp[0] = reginput; ++ return(1); ++ } else ++ return(0); ++} ++ ++/* ++ - regmatch - main matching routine ++ * ++ * Conceptually the strategy is simple: check to see whether the current ++ * node matches, call self recursively to see whether the rest matches, ++ * and then act accordingly. In practice we make some effort to avoid ++ * recursion, in particular by going through "ordinary" nodes (that don't ++ * need to know whether the rest of the match failed) by a loop instead of ++ * by recursion. ++ */ ++static int /* 0 failure, 1 success */ ++regmatch(char *prog) ++{ ++ register char *scan = prog; /* Current node. */ ++ char *next; /* Next node. */ ++ ++#ifdef DEBUG ++ if (scan != NULL && regnarrate) ++ fprintf(stderr, "%s(\n", regprop(scan)); ++#endif ++ while (scan != NULL) { ++#ifdef DEBUG ++ if (regnarrate) ++ fprintf(stderr, "%s...\n", regprop(scan)); ++#endif ++ next = regnext(scan); ++ ++ switch (OP(scan)) { ++ case BOL: ++ if (reginput != regbol) ++ return(0); ++ break; ++ case EOL: ++ if (*reginput != '\0') ++ return(0); ++ break; ++ case ANY: ++ if (*reginput == '\0') ++ return(0); ++ reginput++; ++ break; ++ case EXACTLY: { ++ register int len; ++ register char *opnd; ++ ++ opnd = OPERAND(scan); ++ /* Inline the first character, for speed. */ ++ if (*opnd != *reginput) ++ return(0); ++ len = strlen(opnd); ++ if (len > 1 && strncmp(opnd, reginput, len) != 0) ++ return(0); ++ reginput += len; ++ } ++ break; ++ case ANYOF: ++ if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) == NULL) ++ return(0); ++ reginput++; ++ break; ++ case ANYBUT: ++ if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) != NULL) ++ return(0); ++ reginput++; ++ break; ++ case NOTHING: ++ case BACK: ++ break; ++ case OPEN+1: ++ case OPEN+2: ++ case OPEN+3: ++ case OPEN+4: ++ case OPEN+5: ++ case OPEN+6: ++ case OPEN+7: ++ case OPEN+8: ++ case OPEN+9: { ++ register int no; ++ register char *save; ++ ++ no = OP(scan) - OPEN; ++ save = reginput; ++ ++ if (regmatch(next)) { ++ /* ++ * Don't set startp if some later ++ * invocation of the same parentheses ++ * already has. ++ */ ++ if (regstartp[no] == NULL) ++ regstartp[no] = save; ++ return(1); ++ } else ++ return(0); ++ } ++ break; ++ case CLOSE+1: ++ case CLOSE+2: ++ case CLOSE+3: ++ case CLOSE+4: ++ case CLOSE+5: ++ case CLOSE+6: ++ case CLOSE+7: ++ case CLOSE+8: ++ case CLOSE+9: ++ { ++ register int no; ++ register char *save; ++ ++ no = OP(scan) - CLOSE; ++ save = reginput; ++ ++ if (regmatch(next)) { ++ /* ++ * Don't set endp if some later ++ * invocation of the same parentheses ++ * already has. ++ */ ++ if (regendp[no] == NULL) ++ regendp[no] = save; ++ return(1); ++ } else ++ return(0); ++ } ++ break; ++ case BRANCH: { ++ register char *save; ++ ++ if (OP(next) != BRANCH) /* No choice. */ ++ next = OPERAND(scan); /* Avoid recursion. */ ++ else { ++ do { ++ save = reginput; ++ if (regmatch(OPERAND(scan))) ++ return(1); ++ reginput = save; ++ scan = regnext(scan); ++ } while (scan != NULL && OP(scan) == BRANCH); ++ return(0); ++ /* NOTREACHED */ ++ } ++ } ++ break; ++ case STAR: ++ case PLUS: { ++ register char nextch; ++ register int no; ++ register char *save; ++ register int min; ++ ++ /* ++ * Lookahead to avoid useless match attempts ++ * when we know what character comes next. ++ */ ++ nextch = '\0'; ++ if (OP(next) == EXACTLY) ++ nextch = *OPERAND(next); ++ min = (OP(scan) == STAR) ? 0 : 1; ++ save = reginput; ++ no = regrepeat(OPERAND(scan)); ++ while (no >= min) { ++ /* If it could work, try it. */ ++ if (nextch == '\0' || *reginput == nextch) ++ if (regmatch(next)) ++ return(1); ++ /* Couldn't or didn't -- back up. */ ++ no--; ++ reginput = save + no; ++ } ++ return(0); ++ } ++ break; ++ case END: ++ return(1); /* Success! */ ++ break; ++ default: ++ printk("<3>Regexp: memory corruption\n"); ++ return(0); ++ break; ++ } ++ ++ scan = next; ++ } ++ ++ /* ++ * We get here only if there's trouble -- normally "case END" is ++ * the terminating point. ++ */ ++ printk("<3>Regexp: corrupted pointers\n"); ++ return(0); ++} ++ ++/* ++ - regrepeat - repeatedly match something simple, report how many ++ */ ++static int ++regrepeat(char *p) ++{ ++ register int count = 0; ++ register char *scan; ++ register char *opnd; ++ ++ scan = reginput; ++ opnd = OPERAND(p); ++ switch (OP(p)) { ++ case ANY: ++ count = strlen(scan); ++ scan += count; ++ break; ++ case EXACTLY: ++ while (*opnd == *scan) { ++ count++; ++ scan++; ++ } ++ break; ++ case ANYOF: ++ while (*scan != '\0' && strchr(opnd, *scan) != NULL) { ++ count++; ++ scan++; ++ } ++ break; ++ case ANYBUT: ++ while (*scan != '\0' && strchr(opnd, *scan) == NULL) { ++ count++; ++ scan++; ++ } ++ break; ++ default: /* Oh dear. Called inappropriately. */ ++ printk("<3>Regexp: internal foulup\n"); ++ count = 0; /* Best compromise. */ ++ break; ++ } ++ reginput = scan; ++ ++ return(count); ++} ++ ++/* ++ - regnext - dig the "next" pointer out of a node ++ */ ++static char* ++regnext(char *p) ++{ ++ register int offset; ++ ++ if (p == ®dummy) ++ return(NULL); ++ ++ offset = NEXT(p); ++ if (offset == 0) ++ return(NULL); ++ ++ if (OP(p) == BACK) ++ return(p-offset); ++ else ++ return(p+offset); ++} ++ ++#ifdef DEBUG ++ ++STATIC char *regprop(); ++ ++/* ++ - regdump - dump a regexp onto stdout in vaguely comprehensible form ++ */ ++void ++regdump(regexp *r) ++{ ++ register char *s; ++ register char op = EXACTLY; /* Arbitrary non-END op. */ ++ register char *next; ++ /* extern char *strchr(); */ ++ ++ ++ s = r->program + 1; ++ while (op != END) { /* While that wasn't END last time... */ ++ op = OP(s); ++ printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */ ++ next = regnext(s); ++ if (next == NULL) /* Next ptr. */ ++ printf("(0)"); ++ else ++ printf("(%d)", (s-r->program)+(next-s)); ++ s += 3; ++ if (op == ANYOF || op == ANYBUT || op == EXACTLY) { ++ /* Literal string, where present. */ ++ while (*s != '\0') { ++ putchar(*s); ++ s++; ++ } ++ s++; ++ } ++ putchar('\n'); ++ } ++ ++ /* Header fields of interest. */ ++ if (r->regstart != '\0') ++ printf("start `%c' ", r->regstart); ++ if (r->reganch) ++ printf("anchored "); ++ if (r->regmust != NULL) ++ printf("must have \"%s\"", r->regmust); ++ printf("\n"); ++} ++ ++/* ++ - regprop - printable representation of opcode ++ */ ++static char * ++regprop(char *op) ++{ ++#define BUFLEN 50 ++ register char *p; ++ static char buf[BUFLEN]; ++ ++ strcpy(buf, ":"); ++ ++ switch (OP(op)) { ++ case BOL: ++ p = "BOL"; ++ break; ++ case EOL: ++ p = "EOL"; ++ break; ++ case ANY: ++ p = "ANY"; ++ break; ++ case ANYOF: ++ p = "ANYOF"; ++ break; ++ case ANYBUT: ++ p = "ANYBUT"; ++ break; ++ case BRANCH: ++ p = "BRANCH"; ++ break; ++ case EXACTLY: ++ p = "EXACTLY"; ++ break; ++ case NOTHING: ++ p = "NOTHING"; ++ break; ++ case BACK: ++ p = "BACK"; ++ break; ++ case END: ++ p = "END"; ++ break; ++ case OPEN+1: ++ case OPEN+2: ++ case OPEN+3: ++ case OPEN+4: ++ case OPEN+5: ++ case OPEN+6: ++ case OPEN+7: ++ case OPEN+8: ++ case OPEN+9: ++ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN); ++ p = NULL; ++ break; ++ case CLOSE+1: ++ case CLOSE+2: ++ case CLOSE+3: ++ case CLOSE+4: ++ case CLOSE+5: ++ case CLOSE+6: ++ case CLOSE+7: ++ case CLOSE+8: ++ case CLOSE+9: ++ snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE); ++ p = NULL; ++ break; ++ case STAR: ++ p = "STAR"; ++ break; ++ case PLUS: ++ p = "PLUS"; ++ break; ++ default: ++ printk("<3>Regexp: corrupted opcode\n"); ++ break; ++ } ++ if (p != NULL) ++ strncat(buf, p, BUFLEN-strlen(buf)); ++ return(buf); ++} ++#endif ++ ++ +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.h linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.h +--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regexp.h 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regexp.h 2004-06-27 19:07:00.000000000 -0500 +@@ -0,0 +1,27 @@ ++/* ++ * Definitions etc. for regexp(3) routines. ++ * ++ * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof], ++ * not the System V one. ++ */ ++ ++#ifndef REGEXP_H ++#define REGEXP_H ++ ++#define NSUBEXP 10 ++typedef struct regexp { ++ char *startp[NSUBEXP]; ++ char *endp[NSUBEXP]; ++ char regstart; /* Internal use only. */ ++ char reganch; /* Internal use only. */ ++ char *regmust; /* Internal use only. */ ++ int regmlen; /* Internal use only. */ ++ char program[1]; /* Unwarranted chumminess with compiler. */ ++} regexp; ++ ++regexp * regcomp(char *exp, int *patternsize); ++int regexec(regexp *prog, char *string); ++void regsub(regexp *prog, char *source, char *dest); ++void regerror(char *s); ++ ++#endif +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regmagic.h linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regmagic.h +--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regmagic.h 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regmagic.h 2004-06-27 19:07:00.000000000 -0500 +@@ -0,0 +1,5 @@ ++/* ++ * The first byte of the regexp internal "program" is actually this magic ++ * number; the start node begins in the second byte. ++ */ ++#define MAGIC 0234 +diff -Nurp linux-2.4.26-stock/net/ipv4/netfilter/regexp/regsub.c linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regsub.c +--- linux-2.4.26-stock/net/ipv4/netfilter/regexp/regsub.c 1969-12-31 18:00:00.000000000 -0600 ++++ linux-2.4.26-layer7-clean/net/ipv4/netfilter/regexp/regsub.c 2004-06-27 19:07:00.000000000 -0500 +@@ -0,0 +1,95 @@ ++/* ++ * regsub ++ * @(#)regsub.c 1.3 of 2 April 86 ++ * ++ * Copyright (c) 1986 by University of Toronto. ++ * Written by Henry Spencer. Not derived from licensed software. ++ * ++ * Permission is granted to anyone to use this software for any ++ * purpose on any computer system, and to redistribute it freely, ++ * subject to the following restrictions: ++ * ++ * 1. The author is not responsible for the consequences of use of ++ * this software, no matter how awful, even if they arise ++ * from defects in it. ++ * ++ * 2. The origin of this software must not be misrepresented, either ++ * by explicit claim or by omission. ++ * ++ * 3. Altered versions must be plainly marked as such, and must not ++ * be misrepresented as being the original software. ++ * ++ * ++ * This code was modified by Ethan Sommer to work within the kernel ++ * (it now uses kmalloc etc..) ++ * ++ */ ++#include "regexp.h" ++#include "regmagic.h" ++#include <linux/string.h> ++ ++ ++#ifndef CHARBITS ++#define UCHARAT(p) ((int)*(unsigned char *)(p)) ++#else ++#define UCHARAT(p) ((int)*(p)&CHARBITS) ++#endif ++ ++#if 0 ++//void regerror(char * s) ++//{ ++// printk("regexp(3): %s", s); ++// /* NOTREACHED */ ++//} ++#endif ++ ++/* ++ - regsub - perform substitutions after a regexp match ++ */ ++void ++regsub(regexp * prog, char * source, char * dest) ++{ ++ register char *src; ++ register char *dst; ++ register char c; ++ register int no; ++ register int len; ++ ++ /* Not necessary and gcc doesn't like it -MLS */ ++ /*extern char *strncpy();*/ ++ ++ if (prog == NULL || source == NULL || dest == NULL) { ++ regerror("NULL parm to regsub"); ++ return; ++ } ++ if (UCHARAT(prog->program) != MAGIC) { ++ regerror("damaged regexp fed to regsub"); ++ return; ++ } ++ ++ src = source; ++ dst = dest; ++ while ((c = *src++) != '\0') { ++ if (c == '&') ++ no = 0; ++ else if (c == '\\' && '0' <= *src && *src <= '9') ++ no = *src++ - '0'; ++ else ++ no = -1; ++ ++ if (no < 0) { /* Ordinary character. */ ++ if (c == '\\' && (*src == '\\' || *src == '&')) ++ c = *src++; ++ *dst++ = c; ++ } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) { ++ len = prog->endp[no] - prog->startp[no]; ++ (void) strncpy(dst, prog->startp[no], len); ++ dst += len; ++ if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */ ++ regerror("damaged match string"); ++ return; ++ } ++ } ++ } ++ *dst++ = '\0'; ++} |