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[openwrt.git] / openwrt / target / linux / linux-2.4 / patches / generic / 102-netfilter_layer7.patch
1 diff -Nurp linux-2.4.30/Documentation/Configure.help linux-2.4.30-layer7/Documentation/Configure.help
2 --- linux-2.4.30/Documentation/Configure.help 2005-04-03 20:42:19.000000000 -0500
3 +++ linux-2.4.30-layer7/Documentation/Configure.help 2005-05-03 18:37:03.000000000 -0500
4 @@ -29056,6 +29056,23 @@ CONFIG_SOUND_WM97XX
5
6 If unsure, say N.
7
8 +CONFIG_IP_NF_MATCH_LAYER7
9 + Say Y if you want to be able to classify connections (and their
10 + packets) based on regular expression matching of their application
11 + layer data. This is one way to classify applications such as
12 + peer-to-peer filesharing systems that do not always use the same
13 + port.
14 +
15 + To compile it as a module, choose M here. If unsure, say N.
16 +
17 +CONFIG_IP_NF_MATCH_LAYER7_DEBUG
18 + Say Y to get lots of debugging output.
19 +
20 +CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN
21 + Size of the buffer that the application layer data is stored in.
22 + Unless you know what you're doing, leave it at the default of 2048
23 + Bytes.
24 +
25 #
26 # A couple of things I keep forgetting:
27 # capitalize: AppleTalk, Ethernet, DOS, DMA, FAT, FTP, Internet,
28 diff -Nurp linux-2.4.30/include/linux/netfilter_ipv4/ip_conntrack.h linux-2.4.30-layer7/include/linux/netfilter_ipv4/ip_conntrack.h
29 --- linux-2.4.30/include/linux/netfilter_ipv4/ip_conntrack.h 2005-04-03 20:42:20.000000000 -0500
30 +++ linux-2.4.30-layer7/include/linux/netfilter_ipv4/ip_conntrack.h 2005-05-03 18:37:03.000000000 -0500
31 @@ -207,6 +207,17 @@ struct ip_conntrack
32 } nat;
33 #endif /* CONFIG_IP_NF_NAT_NEEDED */
34
35 +#if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
36 + struct {
37 + unsigned int numpackets; /* surely this is kept track of somewhere else, right? I can't find it... */
38 + char * app_proto; /* "http", "ftp", etc. NULL if unclassifed */
39 +
40 + /* the application layer data so far. NULL if ->numpackets > numpackets */
41 + char * app_data;
42 +
43 + unsigned int app_data_len;
44 + } layer7;
45 +#endif
46 };
47
48 /* get master conntrack via master expectation */
49 diff -Nurp linux-2.4.30/include/linux/netfilter_ipv4/ipt_layer7.h linux-2.4.30-layer7/include/linux/netfilter_ipv4/ipt_layer7.h
50 --- linux-2.4.30/include/linux/netfilter_ipv4/ipt_layer7.h 1969-12-31 18:00:00.000000000 -0600
51 +++ linux-2.4.30-layer7/include/linux/netfilter_ipv4/ipt_layer7.h 2005-05-03 18:37:03.000000000 -0500
52 @@ -0,0 +1,26 @@
53 +/*
54 + By Matthew Strait <quadong@users.sf.net>, Dec 2003.
55 + http://l7-filter.sf.net
56 +
57 + This program is free software; you can redistribute it and/or
58 + modify it under the terms of the GNU General Public License
59 + as published by the Free Software Foundation; either version
60 + 2 of the License, or (at your option) any later version.
61 + http://www.gnu.org/licenses/gpl.txt
62 +*/
63 +
64 +#ifndef _IPT_LAYER7_H
65 +#define _IPT_LAYER7_H
66 +
67 +#define MAX_PATTERN_LEN 8192
68 +#define MAX_PROTOCOL_LEN 256
69 +
70 +typedef char *(*proc_ipt_search) (char *, char, char *);
71 +
72 +struct ipt_layer7_info {
73 + char protocol[MAX_PROTOCOL_LEN];
74 + char invert:1;
75 + char pattern[MAX_PATTERN_LEN];
76 +};
77 +
78 +#endif /* _IPT_LAYER7_H */
79 diff -Nurp linux-2.4.30/net/ipv4/netfilter/Config.in linux-2.4.30-layer7/net/ipv4/netfilter/Config.in
80 --- linux-2.4.30/net/ipv4/netfilter/Config.in 2005-01-19 08:10:13.000000000 -0600
81 +++ linux-2.4.30-layer7/net/ipv4/netfilter/Config.in 2005-05-03 18:37:03.000000000 -0500
82 @@ -43,6 +43,10 @@ if [ "$CONFIG_IP_NF_IPTABLES" != "n" ];
83 if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
84 dep_tristate ' Unclean match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_UNCLEAN $CONFIG_IP_NF_IPTABLES
85 dep_tristate ' Owner match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_OWNER $CONFIG_IP_NF_IPTABLES
86 + dep_tristate ' Layer 7 match support (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7 $CONFIG_IP_NF_CONNTRACK
87 + dep_mbool ' Layer 7 debugging output (EXPERIMENTAL)' CONFIG_IP_NF_MATCH_LAYER7_DEBUG $CONFIG_IP_NF_MATCH_LAYER7
88 + int ' Buffer size for application layer data (256-65536)' CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN 2048
89 +
90 fi
91 # The targets
92 dep_tristate ' Packet filtering' CONFIG_IP_NF_FILTER $CONFIG_IP_NF_IPTABLES
93 diff -Nurp linux-2.4.30/net/ipv4/netfilter/Makefile linux-2.4.30-layer7/net/ipv4/netfilter/Makefile
94 --- linux-2.4.30/net/ipv4/netfilter/Makefile 2003-08-25 06:44:44.000000000 -0500
95 +++ linux-2.4.30-layer7/net/ipv4/netfilter/Makefile 2005-05-03 18:44:12.000000000 -0500
96 @@ -86,6 +86,7 @@ obj-$(CONFIG_IP_NF_MATCH_STATE) += ipt_s
97 obj-$(CONFIG_IP_NF_MATCH_CONNTRACK) += ipt_conntrack.o
98 obj-$(CONFIG_IP_NF_MATCH_UNCLEAN) += ipt_unclean.o
99 obj-$(CONFIG_IP_NF_MATCH_TCPMSS) += ipt_tcpmss.o
100 +obj-$(CONFIG_IP_NF_MATCH_LAYER7) += ipt_layer7.o
101
102 # targets
103 obj-$(CONFIG_IP_NF_TARGET_REJECT) += ipt_REJECT.o
104 diff -Nurp linux-2.4.30/net/ipv4/netfilter/ip_conntrack_core.c linux-2.4.30-layer7/net/ipv4/netfilter/ip_conntrack_core.c
105 --- linux-2.4.30/net/ipv4/netfilter/ip_conntrack_core.c 2005-04-03 20:42:20.000000000 -0500
106 +++ linux-2.4.30-layer7/net/ipv4/netfilter/ip_conntrack_core.c 2005-05-03 18:37:03.000000000 -0500
107 @@ -346,6 +346,14 @@ destroy_conntrack(struct nf_conntrack *n
108 }
109 kfree(ct->master);
110 }
111 +
112 + #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
113 + if(ct->layer7.app_proto)
114 + kfree(ct->layer7.app_proto);
115 + if(ct->layer7.app_data)
116 + kfree(ct->layer7.app_data);
117 + #endif
118 +
119 WRITE_UNLOCK(&ip_conntrack_lock);
120
121 if (master)
122 diff -Nurp linux-2.4.30/net/ipv4/netfilter/ip_conntrack_standalone.c linux-2.4.30-layer7/net/ipv4/netfilter/ip_conntrack_standalone.c
123 --- linux-2.4.30/net/ipv4/netfilter/ip_conntrack_standalone.c 2005-04-03 20:42:20.000000000 -0500
124 +++ linux-2.4.30-layer7/net/ipv4/netfilter/ip_conntrack_standalone.c 2005-05-03 18:37:03.000000000 -0500
125 @@ -107,6 +107,13 @@ print_conntrack(char *buffer, struct ip_
126 len += sprintf(buffer + len, "[ASSURED] ");
127 len += sprintf(buffer + len, "use=%u ",
128 atomic_read(&conntrack->ct_general.use));
129 +
130 + #if defined(CONFIG_IP_NF_MATCH_LAYER7) || defined(CONFIG_IP_NF_MATCH_LAYER7_MODULE)
131 + if(conntrack->layer7.app_proto)
132 + len += sprintf(buffer + len, "l7proto=%s ",
133 + conntrack->layer7.app_proto);
134 + #endif
135 +
136 len += sprintf(buffer + len, "\n");
137
138 return len;
139 diff -Nurp linux-2.4.30/net/ipv4/netfilter/ipt_layer7.c linux-2.4.30-layer7/net/ipv4/netfilter/ipt_layer7.c
140 --- linux-2.4.30/net/ipv4/netfilter/ipt_layer7.c 1969-12-31 18:00:00.000000000 -0600
141 +++ linux-2.4.30-layer7/net/ipv4/netfilter/ipt_layer7.c 2005-05-03 18:37:03.000000000 -0500
142 @@ -0,0 +1,557 @@
143 +/*
144 + Kernel module to match application layer (OSI layer 7)
145 + data in connections.
146 +
147 + http://l7-filter.sf.net
148 +
149 + By Matthew Strait and Ethan Sommer, 2003-2005.
150 +
151 + This program is free software; you can redistribute it and/or
152 + modify it under the terms of the GNU General Public License
153 + as published by the Free Software Foundation; either version
154 + 2 of the License, or (at your option) any later version.
155 + http://www.gnu.org/licenses/gpl.txt
156 +
157 + Based on ipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
158 + and cls_layer7.c (C) 2003 Matthew Strait, Ethan Sommer, Justin Levandoski
159 +*/
160 +
161 +#include <linux/module.h>
162 +#include <linux/skbuff.h>
163 +#include <linux/netfilter_ipv4/ip_conntrack.h>
164 +#include <linux/proc_fs.h>
165 +#include <linux/ctype.h>
166 +#include <net/ip.h>
167 +#include <net/tcp.h>
168 +#include <linux/netfilter_ipv4/lockhelp.h>
169 +
170 +#include "regexp/regexp.c"
171 +
172 +#include <linux/netfilter_ipv4/ipt_layer7.h>
173 +#include <linux/netfilter_ipv4/ip_tables.h>
174 +
175 +MODULE_AUTHOR("Matthew Strait <quadong@users.sf.net>, Ethan Sommer <sommere@users.sf.net>");
176 +MODULE_LICENSE("GPL");
177 +MODULE_DESCRIPTION("iptables application layer match module");
178 +
179 +#if defined(CONFIG_IP_NF_MATCH_LAYER7_DEBUG)
180 + #define DPRINTK(format,args...) printk(format,##args)
181 +#else
182 + #define DPRINTK(format,args...)
183 +#endif
184 +
185 +#define TOTAL_PACKETS master_conntrack->layer7.numpackets
186 +
187 +/* Number of packets whose data we look at.
188 +This can be modified through /proc/net/layer7_numpackets */
189 +static int num_packets = 8;
190 +
191 +static struct pattern_cache {
192 + char * regex_string;
193 + regexp * pattern;
194 + struct pattern_cache * next;
195 +} * first_pattern_cache = NULL;
196 +
197 +/* I'm new to locking. Here are my assumptions:
198 +
199 +- No one will write to /proc/net/layer7_numpackets over and over very fast;
200 + if they did, nothing awful would happen.
201 +
202 +- This code will never be processing the same packet twice at the same time,
203 + because iptables rules are traversed in order.
204 +
205 +- It doesn't matter if two packets from different connections are in here at
206 + the same time, because they don't share any data.
207 +
208 +- It _does_ matter if two packets from the same connection are here at the same
209 + time. In this case, we have to protect the conntracks and the list of
210 + compiled patterns.
211 +*/
212 +DECLARE_RWLOCK(ct_lock);
213 +DECLARE_LOCK(list_lock);
214 +
215 +#if CONFIG_IP_NF_MATCH_LAYER7_DEBUG
216 +/* Converts an unfriendly string into a friendly one by
217 +replacing unprintables with periods and all whitespace with " ". */
218 +static char * friendly_print(unsigned char * s)
219 +{
220 + char * f = kmalloc(strlen(s) + 1, GFP_ATOMIC);
221 + int i;
222 +
223 + if(!f) {
224 + if (net_ratelimit())
225 + printk(KERN_ERR "layer7: out of memory in friendly_print, bailing.\n");
226 + return NULL;
227 + }
228 +
229 + for(i = 0; i < strlen(s); i++){
230 + if(isprint(s[i]) && s[i] < 128) f[i] = s[i];
231 + else if(isspace(s[i])) f[i] = ' ';
232 + else f[i] = '.';
233 + }
234 + f[i] = '\0';
235 + return f;
236 +}
237 +
238 +static char dec2hex(int i)
239 +{
240 + switch (i) {
241 + case 0 ... 9:
242 + return (char)(i + '0');
243 + break;
244 + case 10 ... 15:
245 + return (char)(i - 10 + 'a');
246 + break;
247 + default:
248 + if (net_ratelimit())
249 + printk("Problem in dec2hex\n");
250 + return '\0';
251 + }
252 +}
253 +
254 +static char * hex_print(unsigned char * s)
255 +{
256 + char * g = kmalloc(strlen(s)*3 + 1, GFP_ATOMIC);
257 + int i;
258 +
259 + if(!g) {
260 + if (net_ratelimit())
261 + printk(KERN_ERR "layer7: out of memory in hex_print, bailing.\n");
262 + return NULL;
263 + }
264 +
265 + for(i = 0; i < strlen(s); i++) {
266 + g[i*3 ] = dec2hex(s[i]/16);
267 + g[i*3 + 1] = dec2hex(s[i]%16);
268 + g[i*3 + 2] = ' ';
269 + }
270 + g[i*3] = '\0';
271 +
272 + return g;
273 +}
274 +#endif // DEBUG
275 +
276 +/* Use instead of regcomp. As we expect to be seeing the same regexps over and
277 +over again, it make sense to cache the results. */
278 +static regexp * compile_and_cache(char * regex_string, char * protocol)
279 +{
280 + struct pattern_cache * node = first_pattern_cache;
281 + struct pattern_cache * last_pattern_cache = first_pattern_cache;
282 + struct pattern_cache * tmp;
283 + unsigned int len;
284 +
285 + while (node != NULL) {
286 + if (!strcmp(node->regex_string, regex_string))
287 + return node->pattern;
288 +
289 + last_pattern_cache = node;/* points at the last non-NULL node */
290 + node = node->next;
291 + }
292 +
293 + /* If we reach the end of the list, then we have not yet cached
294 + the pattern for this regex. Let's do that now.
295 + Be paranoid about running out of memory to avoid list corruption. */
296 + tmp = kmalloc(sizeof(struct pattern_cache), GFP_ATOMIC);
297 +
298 + if(!tmp) {
299 + if (net_ratelimit())
300 + printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n");
301 + return NULL;
302 + }
303 +
304 + tmp->regex_string = kmalloc(strlen(regex_string) + 1, GFP_ATOMIC);
305 + tmp->pattern = kmalloc(sizeof(struct regexp), GFP_ATOMIC);
306 + tmp->next = NULL;
307 +
308 + if(!tmp->regex_string || !tmp->pattern) {
309 + if (net_ratelimit())
310 + printk(KERN_ERR "layer7: out of memory in compile_and_cache, bailing.\n");
311 + kfree(tmp->regex_string);
312 + kfree(tmp->pattern);
313 + kfree(tmp);
314 + return NULL;
315 + }
316 +
317 + /* Ok. The new node is all ready now. */
318 + node = tmp;
319 +
320 + if(first_pattern_cache == NULL) /* list is empty */
321 + first_pattern_cache = node; /* make node the beginning */
322 + else
323 + last_pattern_cache->next = node; /* attach node to the end */
324 +
325 + /* copy the string and compile the regex */
326 + len = strlen(regex_string);
327 + DPRINTK("About to compile this: \"%s\"\n", regex_string);
328 + node->pattern = regcomp(regex_string, &len);
329 + if ( !node->pattern ) {
330 + if (net_ratelimit())
331 + printk(KERN_ERR "layer7: Error compiling regexp \"%s\" (%s)\n", regex_string, protocol);
332 + /* pattern is now cached as NULL, so we won't try again. */
333 + }
334 +
335 + strcpy(node->regex_string, regex_string);
336 + return node->pattern;
337 +}
338 +
339 +static int can_handle(const struct sk_buff *skb)
340 +{
341 + if(!skb->nh.iph) /* not IP */
342 + return 0;
343 + if(skb->nh.iph->protocol != IPPROTO_TCP &&
344 + skb->nh.iph->protocol != IPPROTO_UDP &&
345 + skb->nh.iph->protocol != IPPROTO_ICMP)
346 + return 0;
347 + return 1;
348 +}
349 +
350 +/* Returns offset the into the skb->data that the application data starts */
351 +static int app_data_offset(const struct sk_buff *skb)
352 +{
353 + /* In case we are ported somewhere (ebtables?) where skb->nh.iph
354 + isn't set, this can be gotten from 4*(skb->data[0] & 0x0f) as well. */
355 + int ip_hl = 4*skb->nh.iph->ihl;
356 +
357 + if( skb->nh.iph->protocol == IPPROTO_TCP ) {
358 + /* 12 == offset into TCP header for the header length field.
359 + Can't get this with skb->h.th->doff because the tcphdr
360 + struct doesn't get set when routing (this is confirmed to be
361 + true in Netfilter as well as QoS.) */
362 + int tcp_hl = 4*(skb->data[ip_hl + 12] >> 4);
363 +
364 + return ip_hl + tcp_hl;
365 + } else if( skb->nh.iph->protocol == IPPROTO_UDP ) {
366 + return ip_hl + 8; /* UDP header is always 8 bytes */
367 + } else if( skb->nh.iph->protocol == IPPROTO_ICMP ) {
368 + return ip_hl + 8; /* ICMP header is 8 bytes */
369 + } else {
370 + if (net_ratelimit())
371 + printk(KERN_ERR "layer7: tried to handle unknown protocol!\n");
372 + return ip_hl + 8; /* something reasonable */
373 + }
374 +}
375 +
376 +/* handles whether there's a match when we aren't appending data anymore */
377 +static int match_no_append(struct ip_conntrack * conntrack, struct ip_conntrack * master_conntrack,
378 + enum ip_conntrack_info ctinfo, enum ip_conntrack_info master_ctinfo,
379 + struct ipt_layer7_info * info)
380 +{
381 + /* If we're in here, throw the app data away */
382 + WRITE_LOCK(&ct_lock);
383 + if(master_conntrack->layer7.app_data != NULL) {
384 +
385 + #ifdef CONFIG_IP_NF_MATCH_LAYER7_DEBUG
386 + if(!master_conntrack->layer7.app_proto) {
387 + char * f = friendly_print(master_conntrack->layer7.app_data);
388 + char * g = hex_print(master_conntrack->layer7.app_data);
389 + DPRINTK("\nl7-filter gave up after %d bytes (%d packets):\n%s\n",
390 + strlen(f),
391 + TOTAL_PACKETS, f);
392 + kfree(f);
393 + DPRINTK("In hex: %s\n", g);
394 + kfree(g);
395 + }
396 + #endif
397 +
398 + kfree(master_conntrack->layer7.app_data);
399 + master_conntrack->layer7.app_data = NULL; /* don't free again */
400 + }
401 + WRITE_UNLOCK(&ct_lock);
402 +
403 + if(master_conntrack->layer7.app_proto){
404 + /* Here child connections set their .app_proto (for /proc/net/ip_conntrack) */
405 + WRITE_LOCK(&ct_lock);
406 + if(!conntrack->layer7.app_proto) {
407 + conntrack->layer7.app_proto = kmalloc(strlen(master_conntrack->layer7.app_proto)+1, GFP_ATOMIC);
408 + if(!conntrack->layer7.app_proto){
409 + if (net_ratelimit())
410 + printk(KERN_ERR "layer7: out of memory in match_no_append, bailing.\n");
411 + WRITE_UNLOCK(&ct_lock);
412 + return 1;
413 + }
414 + strcpy(conntrack->layer7.app_proto, master_conntrack->layer7.app_proto);
415 + }
416 + WRITE_UNLOCK(&ct_lock);
417 +
418 + return (!strcmp(master_conntrack->layer7.app_proto, info->protocol));
419 + }
420 + else {
421 + /* If not classified, set to "unknown" to distinguish from
422 + connections that are still being tested. */
423 + WRITE_LOCK(&ct_lock);
424 + master_conntrack->layer7.app_proto = kmalloc(strlen("unknown")+1, GFP_ATOMIC);
425 + if(!master_conntrack->layer7.app_proto){
426 + if (net_ratelimit())
427 + printk(KERN_ERR "layer7: out of memory in match_no_append, bailing.\n");
428 + WRITE_UNLOCK(&ct_lock);
429 + return 1;
430 + }
431 + strcpy(master_conntrack->layer7.app_proto, "unknown");
432 + WRITE_UNLOCK(&ct_lock);
433 + return 0;
434 + }
435 +}
436 +
437 +/* add the new app data to the conntrack. Return number of bytes added. */
438 +static int add_data(struct ip_conntrack * master_conntrack,
439 + char * app_data, int appdatalen)
440 +{
441 + int length = 0, i;
442 + int oldlength = master_conntrack->layer7.app_data_len;
443 +
444 + /* Strip nulls. Make everything lower case (our regex lib doesn't
445 + do case insensitivity). Add it to the end of the current data. */
446 + for(i = 0; i < CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN-oldlength-1 &&
447 + i < appdatalen; i++) {
448 + if(app_data[i] != '\0') {
449 + master_conntrack->layer7.app_data[length+oldlength] =
450 + /* the kernel version of tolower mungs 'upper ascii' */
451 + isascii(app_data[i])? tolower(app_data[i]) : app_data[i];
452 + length++;
453 + }
454 + }
455 +
456 + master_conntrack->layer7.app_data[length+oldlength] = '\0';
457 + master_conntrack->layer7.app_data_len = length + oldlength;
458 +
459 + return length;
460 +}
461 +
462 +/* Returns true on match and false otherwise. */
463 +static int match(/* const */struct sk_buff *skb, const struct net_device *in,
464 + const struct net_device *out, const void *matchinfo,
465 + int offset, int *hotdrop)
466 +{
467 + struct ipt_layer7_info * info = (struct ipt_layer7_info *)matchinfo;
468 + enum ip_conntrack_info master_ctinfo, ctinfo;
469 + struct ip_conntrack *master_conntrack, *conntrack;
470 + unsigned char * app_data;
471 + unsigned int pattern_result, appdatalen;
472 + regexp * comppattern;
473 +
474 + if(!can_handle(skb)){
475 + DPRINTK("layer7: This is some protocol I can't handle.\n");
476 + return info->invert;
477 + }
478 +
479 + /* Treat the parent and all its children together as one connection,
480 + except for the purpose of setting conntrack->layer7.app_proto in the
481 + actual connection. This makes /proc/net/ip_conntrack somewhat more
482 + satisfying. */
483 + if(!(conntrack = ip_conntrack_get((struct sk_buff *)skb, &ctinfo)) ||
484 + !(master_conntrack = ip_conntrack_get((struct sk_buff *)skb, &master_ctinfo))) {
485 + DPRINTK("layer7: packet is not from a known connection, giving up.\n");
486 + return info->invert;
487 + }
488 +
489 + /* Try to get a master conntrack (and its master etc) for FTP, etc. */
490 + while (master_ct(master_conntrack) != NULL)
491 + master_conntrack = master_ct(master_conntrack);
492 +
493 + if(!skb->cb[0]){
494 + WRITE_LOCK(&ct_lock);
495 + master_conntrack->layer7.numpackets++;/*starts at 0 via memset*/
496 + WRITE_UNLOCK(&ct_lock);
497 + }
498 +
499 + /* if we've classified it or seen too many packets */
500 + if(TOTAL_PACKETS > num_packets ||
501 + master_conntrack->layer7.app_proto) {
502 +
503 + pattern_result = match_no_append(conntrack, master_conntrack, ctinfo, master_ctinfo, info);
504 +
505 + /* skb->cb[0] == seen. Avoid doing things twice if there are two l7
506 + rules. I'm not sure that using cb for this purpose is correct, although
507 + it says "put your private variables there". But it doesn't look like it
508 + is being used for anything else in the skbs that make it here. How can
509 + I write to cb without making the compiler angry? */
510 + skb->cb[0] = 1; /* marking it seen here is probably irrelevant, but consistant */
511 +
512 + return (pattern_result ^ info->invert);
513 + }
514 +
515 + if(skb_is_nonlinear(skb)){
516 + if(skb_linearize(skb, GFP_ATOMIC) != 0){
517 + if (net_ratelimit())
518 + printk(KERN_ERR "layer7: failed to linearize packet, bailing.\n");
519 + return info->invert;
520 + }
521 + }
522 +
523 + /* now that the skb is linearized, it's safe to set these. */
524 + app_data = skb->data + app_data_offset(skb);
525 + appdatalen = skb->tail - app_data;
526 +
527 + LOCK_BH(&list_lock);
528 + /* the return value gets checked later, when we're ready to use it */
529 + comppattern = compile_and_cache(info->pattern, info->protocol);
530 + UNLOCK_BH(&list_lock);
531 +
532 + /* On the first packet of a connection, allocate space for app data */
533 + WRITE_LOCK(&ct_lock);
534 + if(TOTAL_PACKETS == 1 && !skb->cb[0] && !master_conntrack->layer7.app_data) {
535 + master_conntrack->layer7.app_data = kmalloc(CONFIG_IP_NF_MATCH_LAYER7_MAXDATALEN, GFP_ATOMIC);
536 + if(!master_conntrack->layer7.app_data){
537 + if (net_ratelimit())
538 + printk(KERN_ERR "layer7: out of memory in match, bailing.\n");
539 + WRITE_UNLOCK(&ct_lock);
540 + return info->invert;
541 + }
542 +
543 + master_conntrack->layer7.app_data[0] = '\0';
544 + }
545 + WRITE_UNLOCK(&ct_lock);
546 +
547 + /* Can be here, but unallocated, if numpackets is increased near
548 + the beginning of a connection */
549 + if(master_conntrack->layer7.app_data == NULL)
550 + return (info->invert); /* unmatched */
551 +
552 + if(!skb->cb[0]){
553 + int newbytes;
554 + WRITE_LOCK(&ct_lock);
555 + newbytes = add_data(master_conntrack, app_data, appdatalen);
556 + WRITE_UNLOCK(&ct_lock);
557 +
558 + if(newbytes == 0) { /* didn't add any data */
559 + skb->cb[0] = 1;
560 + /* Didn't match before, not going to match now */
561 + return info->invert;
562 + }
563 + }
564 +
565 + /* If looking for "unknown", then never match. "Unknown" means that
566 + we've given up; we're still trying with these packets. */
567 + if(!strcmp(info->protocol, "unknown")) {
568 + pattern_result = 0;
569 + /* If the regexp failed to compile, don't bother running it */
570 + } else if(comppattern && regexec(comppattern, master_conntrack->layer7.app_data)) {
571 + DPRINTK("layer7: regexec positive: %s!\n", info->protocol);
572 + pattern_result = 1;
573 + } else pattern_result = 0;
574 +
575 + if(pattern_result) {
576 + WRITE_LOCK(&ct_lock);
577 + master_conntrack->layer7.app_proto = kmalloc(strlen(info->protocol)+1, GFP_ATOMIC);
578 + if(!master_conntrack->layer7.app_proto){
579 + if (net_ratelimit())
580 + printk(KERN_ERR "layer7: out of memory in match, bailing.\n");
581 + WRITE_UNLOCK(&ct_lock);
582 + return (pattern_result ^ info->invert);
583 + }
584 + strcpy(master_conntrack->layer7.app_proto, info->protocol);
585 + WRITE_UNLOCK(&ct_lock);
586 + }
587 +
588 + /* mark the packet seen */
589 + skb->cb[0] = 1;
590 +
591 + return (pattern_result ^ info->invert);
592 +}
593 +
594 +static int checkentry(const char *tablename, const struct ipt_ip *ip,
595 + void *matchinfo, unsigned int matchsize, unsigned int hook_mask)
596 +{
597 + if (matchsize != IPT_ALIGN(sizeof(struct ipt_layer7_info)))
598 + return 0;
599 + return 1;
600 +}
601 +
602 +static struct ipt_match layer7_match = {
603 + .name = "layer7",
604 + .match = &match,
605 + .checkentry = &checkentry,
606 + .me = THIS_MODULE
607 +};
608 +
609 +/* taken from drivers/video/modedb.c */
610 +static int my_atoi(const char *s)
611 +{
612 + int val = 0;
613 +
614 + for (;; s++) {
615 + switch (*s) {
616 + case '0'...'9':
617 + val = 10*val+(*s-'0');
618 + break;
619 + default:
620 + return val;
621 + }
622 + }
623 +}
624 +
625 +/* write out num_packets to userland. */
626 +static int layer7_read_proc(char* page, char ** start, off_t off, int count,
627 + int* eof, void * data)
628 +{
629 + if(num_packets > 99 && net_ratelimit())
630 + printk(KERN_ERR "layer7: NOT REACHED. num_packets too big\n");
631 +
632 + page[0] = num_packets/10 + '0';
633 + page[1] = num_packets%10 + '0';
634 + page[2] = '\n';
635 + page[3] = '\0';
636 +
637 + *eof=1;
638 +
639 + return 3;
640 +}
641 +
642 +/* Read in num_packets from userland */
643 +static int layer7_write_proc(struct file* file, const char* buffer,
644 + unsigned long count, void *data)
645 +{
646 + char * foo = kmalloc(count, GFP_ATOMIC);
647 +
648 + if(!foo){
649 + if (net_ratelimit())
650 + printk(KERN_ERR "layer7: out of memory, bailing. num_packets unchanged.\n");
651 + return count;
652 + }
653 +
654 + copy_from_user(foo, buffer, count);
655 +
656 + num_packets = my_atoi(foo);
657 + kfree (foo);
658 +
659 + /* This has an arbitrary limit to make the math easier. I'm lazy.
660 + But anyway, 99 is a LOT! If you want more, you're doing it wrong! */
661 + if(num_packets > 99) {
662 + printk(KERN_WARNING "layer7: num_packets can't be > 99.\n");
663 + num_packets = 99;
664 + } else if(num_packets < 1) {
665 + printk(KERN_WARNING "layer7: num_packets can't be < 1.\n");
666 + num_packets = 1;
667 + }
668 +
669 + return count;
670 +}
671 +
672 +/* register the proc file */
673 +static void layer7_init_proc(void)
674 +{
675 + struct proc_dir_entry* entry;
676 + entry = create_proc_entry("layer7_numpackets", 0644, proc_net);
677 + entry->read_proc = layer7_read_proc;
678 + entry->write_proc = layer7_write_proc;
679 +}
680 +
681 +static void layer7_cleanup_proc(void)
682 +{
683 + remove_proc_entry("layer7_numpackets", proc_net);
684 +}
685 +
686 +static int __init init(void)
687 +{
688 + layer7_init_proc();
689 + return ipt_register_match(&layer7_match);
690 +}
691 +
692 +static void __exit fini(void)
693 +{
694 + layer7_cleanup_proc();
695 + ipt_unregister_match(&layer7_match);
696 +}
697 +
698 +module_init(init);
699 +module_exit(fini);
700 diff -Nurp linux-2.4.30/net/ipv4/netfilter/regexp/regexp.c linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regexp.c
701 --- linux-2.4.30/net/ipv4/netfilter/regexp/regexp.c 1969-12-31 18:00:00.000000000 -0600
702 +++ linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regexp.c 2005-05-03 18:37:03.000000000 -0500
703 @@ -0,0 +1,1195 @@
704 +/*
705 + * regcomp and regexec -- regsub and regerror are elsewhere
706 + * @(#)regexp.c 1.3 of 18 April 87
707 + *
708 + * Copyright (c) 1986 by University of Toronto.
709 + * Written by Henry Spencer. Not derived from licensed software.
710 + *
711 + * Permission is granted to anyone to use this software for any
712 + * purpose on any computer system, and to redistribute it freely,
713 + * subject to the following restrictions:
714 + *
715 + * 1. The author is not responsible for the consequences of use of
716 + * this software, no matter how awful, even if they arise
717 + * from defects in it.
718 + *
719 + * 2. The origin of this software must not be misrepresented, either
720 + * by explicit claim or by omission.
721 + *
722 + * 3. Altered versions must be plainly marked as such, and must not
723 + * be misrepresented as being the original software.
724 + *
725 + * Beware that some of this code is subtly aware of the way operator
726 + * precedence is structured in regular expressions. Serious changes in
727 + * regular-expression syntax might require a total rethink.
728 + *
729 + * This code was modified by Ethan Sommer to work within the kernel
730 + * (it now uses kmalloc etc..)
731 + *
732 + * Modified slightly by Matthew Strait to use more modern C.
733 + */
734 +
735 +#include "regexp.h"
736 +#include "regmagic.h"
737 +
738 +/* added by ethan and matt. Lets it work in both kernel and user space.
739 +(So iptables can use it, for instance.) Yea, it goes both ways... */
740 +#if __KERNEL__
741 + #define malloc(foo) kmalloc(foo,GFP_ATOMIC)
742 +#else
743 + #define printk(format,args...) printf(format,##args)
744 +#endif
745 +
746 +void regerror(char * s)
747 +{
748 + printk("<3>Regexp: %s\n", s);
749 + /* NOTREACHED */
750 +}
751 +
752 +/*
753 + * The "internal use only" fields in regexp.h are present to pass info from
754 + * compile to execute that permits the execute phase to run lots faster on
755 + * simple cases. They are:
756 + *
757 + * regstart char that must begin a match; '\0' if none obvious
758 + * reganch is the match anchored (at beginning-of-line only)?
759 + * regmust string (pointer into program) that match must include, or NULL
760 + * regmlen length of regmust string
761 + *
762 + * Regstart and reganch permit very fast decisions on suitable starting points
763 + * for a match, cutting down the work a lot. Regmust permits fast rejection
764 + * of lines that cannot possibly match. The regmust tests are costly enough
765 + * that regcomp() supplies a regmust only if the r.e. contains something
766 + * potentially expensive (at present, the only such thing detected is * or +
767 + * at the start of the r.e., which can involve a lot of backup). Regmlen is
768 + * supplied because the test in regexec() needs it and regcomp() is computing
769 + * it anyway.
770 + */
771 +
772 +/*
773 + * Structure for regexp "program". This is essentially a linear encoding
774 + * of a nondeterministic finite-state machine (aka syntax charts or
775 + * "railroad normal form" in parsing technology). Each node is an opcode
776 + * plus a "next" pointer, possibly plus an operand. "Next" pointers of
777 + * all nodes except BRANCH implement concatenation; a "next" pointer with
778 + * a BRANCH on both ends of it is connecting two alternatives. (Here we
779 + * have one of the subtle syntax dependencies: an individual BRANCH (as
780 + * opposed to a collection of them) is never concatenated with anything
781 + * because of operator precedence.) The operand of some types of node is
782 + * a literal string; for others, it is a node leading into a sub-FSM. In
783 + * particular, the operand of a BRANCH node is the first node of the branch.
784 + * (NB this is *not* a tree structure: the tail of the branch connects
785 + * to the thing following the set of BRANCHes.) The opcodes are:
786 + */
787 +
788 +/* definition number opnd? meaning */
789 +#define END 0 /* no End of program. */
790 +#define BOL 1 /* no Match "" at beginning of line. */
791 +#define EOL 2 /* no Match "" at end of line. */
792 +#define ANY 3 /* no Match any one character. */
793 +#define ANYOF 4 /* str Match any character in this string. */
794 +#define ANYBUT 5 /* str Match any character not in this string. */
795 +#define BRANCH 6 /* node Match this alternative, or the next... */
796 +#define BACK 7 /* no Match "", "next" ptr points backward. */
797 +#define EXACTLY 8 /* str Match this string. */
798 +#define NOTHING 9 /* no Match empty string. */
799 +#define STAR 10 /* node Match this (simple) thing 0 or more times. */
800 +#define PLUS 11 /* node Match this (simple) thing 1 or more times. */
801 +#define OPEN 20 /* no Mark this point in input as start of #n. */
802 + /* OPEN+1 is number 1, etc. */
803 +#define CLOSE 30 /* no Analogous to OPEN. */
804 +
805 +/*
806 + * Opcode notes:
807 + *
808 + * BRANCH The set of branches constituting a single choice are hooked
809 + * together with their "next" pointers, since precedence prevents
810 + * anything being concatenated to any individual branch. The
811 + * "next" pointer of the last BRANCH in a choice points to the
812 + * thing following the whole choice. This is also where the
813 + * final "next" pointer of each individual branch points; each
814 + * branch starts with the operand node of a BRANCH node.
815 + *
816 + * BACK Normal "next" pointers all implicitly point forward; BACK
817 + * exists to make loop structures possible.
818 + *
819 + * STAR,PLUS '?', and complex '*' and '+', are implemented as circular
820 + * BRANCH structures using BACK. Simple cases (one character
821 + * per match) are implemented with STAR and PLUS for speed
822 + * and to minimize recursive plunges.
823 + *
824 + * OPEN,CLOSE ...are numbered at compile time.
825 + */
826 +
827 +/*
828 + * A node is one char of opcode followed by two chars of "next" pointer.
829 + * "Next" pointers are stored as two 8-bit pieces, high order first. The
830 + * value is a positive offset from the opcode of the node containing it.
831 + * An operand, if any, simply follows the node. (Note that much of the
832 + * code generation knows about this implicit relationship.)
833 + *
834 + * Using two bytes for the "next" pointer is vast overkill for most things,
835 + * but allows patterns to get big without disasters.
836 + */
837 +#define OP(p) (*(p))
838 +#define NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377))
839 +#define OPERAND(p) ((p) + 3)
840 +
841 +/*
842 + * See regmagic.h for one further detail of program structure.
843 + */
844 +
845 +
846 +/*
847 + * Utility definitions.
848 + */
849 +#ifndef CHARBITS
850 +#define UCHARAT(p) ((int)*(unsigned char *)(p))
851 +#else
852 +#define UCHARAT(p) ((int)*(p)&CHARBITS)
853 +#endif
854 +
855 +#define FAIL(m) { regerror(m); return(NULL); }
856 +#define ISMULT(c) ((c) == '*' || (c) == '+' || (c) == '?')
857 +#define META "^$.[()|?+*\\"
858 +
859 +/*
860 + * Flags to be passed up and down.
861 + */
862 +#define HASWIDTH 01 /* Known never to match null string. */
863 +#define SIMPLE 02 /* Simple enough to be STAR/PLUS operand. */
864 +#define SPSTART 04 /* Starts with * or +. */
865 +#define WORST 0 /* Worst case. */
866 +
867 +/*
868 + * Global work variables for regcomp().
869 + */
870 +static char *regparse; /* Input-scan pointer. */
871 +static int regnpar; /* () count. */
872 +static char regdummy;
873 +static char *regcode; /* Code-emit pointer; &regdummy = don't. */
874 +static long regsize; /* Code size. */
875 +
876 +/*
877 + * Forward declarations for regcomp()'s friends.
878 + */
879 +#ifndef STATIC
880 +#define STATIC static
881 +#endif
882 +STATIC char *reg(int paren,int *flagp);
883 +STATIC char *regbranch(int *flagp);
884 +STATIC char *regpiece(int *flagp);
885 +STATIC char *regatom(int *flagp);
886 +STATIC char *regnode(char op);
887 +STATIC char *regnext(char *p);
888 +STATIC void regc(char b);
889 +STATIC void reginsert(char op, char *opnd);
890 +STATIC void regtail(char *p, char *val);
891 +STATIC void regoptail(char *p, char *val);
892 +
893 +
894 +__kernel_size_t my_strcspn(const char *s1,const char *s2)
895 +{
896 + char *scan1;
897 + char *scan2;
898 + int count;
899 +
900 + count = 0;
901 + for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) {
902 + for (scan2 = (char *)s2; *scan2 != '\0';) /* ++ moved down. */
903 + if (*scan1 == *scan2++)
904 + return(count);
905 + count++;
906 + }
907 + return(count);
908 +}
909 +
910 +/*
911 + - regcomp - compile a regular expression into internal code
912 + *
913 + * We can't allocate space until we know how big the compiled form will be,
914 + * but we can't compile it (and thus know how big it is) until we've got a
915 + * place to put the code. So we cheat: we compile it twice, once with code
916 + * generation turned off and size counting turned on, and once "for real".
917 + * This also means that we don't allocate space until we are sure that the
918 + * thing really will compile successfully, and we never have to move the
919 + * code and thus invalidate pointers into it. (Note that it has to be in
920 + * one piece because free() must be able to free it all.)
921 + *
922 + * Beware that the optimization-preparation code in here knows about some
923 + * of the structure of the compiled regexp.
924 + */
925 +regexp *
926 +regcomp(char *exp,int *patternsize)
927 +{
928 + register regexp *r;
929 + register char *scan;
930 + register char *longest;
931 + register int len;
932 + int flags;
933 + /* commented out by ethan
934 + extern char *malloc();
935 + */
936 +
937 + if (exp == NULL)
938 + FAIL("NULL argument");
939 +
940 + /* First pass: determine size, legality. */
941 + regparse = exp;
942 + regnpar = 1;
943 + regsize = 0L;
944 + regcode = &regdummy;
945 + regc(MAGIC);
946 + if (reg(0, &flags) == NULL)
947 + return(NULL);
948 +
949 + /* Small enough for pointer-storage convention? */
950 + if (regsize >= 32767L) /* Probably could be 65535L. */
951 + FAIL("regexp too big");
952 +
953 + /* Allocate space. */
954 + *patternsize=sizeof(regexp) + (unsigned)regsize;
955 + r = (regexp *)malloc(sizeof(regexp) + (unsigned)regsize);
956 + if (r == NULL)
957 + FAIL("out of space");
958 +
959 + /* Second pass: emit code. */
960 + regparse = exp;
961 + regnpar = 1;
962 + regcode = r->program;
963 + regc(MAGIC);
964 + if (reg(0, &flags) == NULL)
965 + return(NULL);
966 +
967 + /* Dig out information for optimizations. */
968 + r->regstart = '\0'; /* Worst-case defaults. */
969 + r->reganch = 0;
970 + r->regmust = NULL;
971 + r->regmlen = 0;
972 + scan = r->program+1; /* First BRANCH. */
973 + if (OP(regnext(scan)) == END) { /* Only one top-level choice. */
974 + scan = OPERAND(scan);
975 +
976 + /* Starting-point info. */
977 + if (OP(scan) == EXACTLY)
978 + r->regstart = *OPERAND(scan);
979 + else if (OP(scan) == BOL)
980 + r->reganch++;
981 +
982 + /*
983 + * If there's something expensive in the r.e., find the
984 + * longest literal string that must appear and make it the
985 + * regmust. Resolve ties in favor of later strings, since
986 + * the regstart check works with the beginning of the r.e.
987 + * and avoiding duplication strengthens checking. Not a
988 + * strong reason, but sufficient in the absence of others.
989 + */
990 + if (flags&SPSTART) {
991 + longest = NULL;
992 + len = 0;
993 + for (; scan != NULL; scan = regnext(scan))
994 + if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) {
995 + longest = OPERAND(scan);
996 + len = strlen(OPERAND(scan));
997 + }
998 + r->regmust = longest;
999 + r->regmlen = len;
1000 + }
1001 + }
1002 +
1003 + return(r);
1004 +}
1005 +
1006 +/*
1007 + - reg - regular expression, i.e. main body or parenthesized thing
1008 + *
1009 + * Caller must absorb opening parenthesis.
1010 + *
1011 + * Combining parenthesis handling with the base level of regular expression
1012 + * is a trifle forced, but the need to tie the tails of the branches to what
1013 + * follows makes it hard to avoid.
1014 + */
1015 +static char *
1016 +reg(int paren, int *flagp /* Parenthesized? */ )
1017 +{
1018 + register char *ret;
1019 + register char *br;
1020 + register char *ender;
1021 + register int parno = 0; /* 0 makes gcc happy */
1022 + int flags;
1023 +
1024 + *flagp = HASWIDTH; /* Tentatively. */
1025 +
1026 + /* Make an OPEN node, if parenthesized. */
1027 + if (paren) {
1028 + if (regnpar >= NSUBEXP)
1029 + FAIL("too many ()");
1030 + parno = regnpar;
1031 + regnpar++;
1032 + ret = regnode(OPEN+parno);
1033 + } else
1034 + ret = NULL;
1035 +
1036 + /* Pick up the branches, linking them together. */
1037 + br = regbranch(&flags);
1038 + if (br == NULL)
1039 + return(NULL);
1040 + if (ret != NULL)
1041 + regtail(ret, br); /* OPEN -> first. */
1042 + else
1043 + ret = br;
1044 + if (!(flags&HASWIDTH))
1045 + *flagp &= ~HASWIDTH;
1046 + *flagp |= flags&SPSTART;
1047 + while (*regparse == '|') {
1048 + regparse++;
1049 + br = regbranch(&flags);
1050 + if (br == NULL)
1051 + return(NULL);
1052 + regtail(ret, br); /* BRANCH -> BRANCH. */
1053 + if (!(flags&HASWIDTH))
1054 + *flagp &= ~HASWIDTH;
1055 + *flagp |= flags&SPSTART;
1056 + }
1057 +
1058 + /* Make a closing node, and hook it on the end. */
1059 + ender = regnode((paren) ? CLOSE+parno : END);
1060 + regtail(ret, ender);
1061 +
1062 + /* Hook the tails of the branches to the closing node. */
1063 + for (br = ret; br != NULL; br = regnext(br))
1064 + regoptail(br, ender);
1065 +
1066 + /* Check for proper termination. */
1067 + if (paren && *regparse++ != ')') {
1068 + FAIL("unmatched ()");
1069 + } else if (!paren && *regparse != '\0') {
1070 + if (*regparse == ')') {
1071 + FAIL("unmatched ()");
1072 + } else
1073 + FAIL("junk on end"); /* "Can't happen". */
1074 + /* NOTREACHED */
1075 + }
1076 +
1077 + return(ret);
1078 +}
1079 +
1080 +/*
1081 + - regbranch - one alternative of an | operator
1082 + *
1083 + * Implements the concatenation operator.
1084 + */
1085 +static char *
1086 +regbranch(int *flagp)
1087 +{
1088 + register char *ret;
1089 + register char *chain;
1090 + register char *latest;
1091 + int flags;
1092 +
1093 + *flagp = WORST; /* Tentatively. */
1094 +
1095 + ret = regnode(BRANCH);
1096 + chain = NULL;
1097 + while (*regparse != '\0' && *regparse != '|' && *regparse != ')') {
1098 + latest = regpiece(&flags);
1099 + if (latest == NULL)
1100 + return(NULL);
1101 + *flagp |= flags&HASWIDTH;
1102 + if (chain == NULL) /* First piece. */
1103 + *flagp |= flags&SPSTART;
1104 + else
1105 + regtail(chain, latest);
1106 + chain = latest;
1107 + }
1108 + if (chain == NULL) /* Loop ran zero times. */
1109 + (void) regnode(NOTHING);
1110 +
1111 + return(ret);
1112 +}
1113 +
1114 +/*
1115 + - regpiece - something followed by possible [*+?]
1116 + *
1117 + * Note that the branching code sequences used for ? and the general cases
1118 + * of * and + are somewhat optimized: they use the same NOTHING node as
1119 + * both the endmarker for their branch list and the body of the last branch.
1120 + * It might seem that this node could be dispensed with entirely, but the
1121 + * endmarker role is not redundant.
1122 + */
1123 +static char *
1124 +regpiece(int *flagp)
1125 +{
1126 + register char *ret;
1127 + register char op;
1128 + register char *next;
1129 + int flags;
1130 +
1131 + ret = regatom(&flags);
1132 + if (ret == NULL)
1133 + return(NULL);
1134 +
1135 + op = *regparse;
1136 + if (!ISMULT(op)) {
1137 + *flagp = flags;
1138 + return(ret);
1139 + }
1140 +
1141 + if (!(flags&HASWIDTH) && op != '?')
1142 + FAIL("*+ operand could be empty");
1143 + *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH);
1144 +
1145 + if (op == '*' && (flags&SIMPLE))
1146 + reginsert(STAR, ret);
1147 + else if (op == '*') {
1148 + /* Emit x* as (x&|), where & means "self". */
1149 + reginsert(BRANCH, ret); /* Either x */
1150 + regoptail(ret, regnode(BACK)); /* and loop */
1151 + regoptail(ret, ret); /* back */
1152 + regtail(ret, regnode(BRANCH)); /* or */
1153 + regtail(ret, regnode(NOTHING)); /* null. */
1154 + } else if (op == '+' && (flags&SIMPLE))
1155 + reginsert(PLUS, ret);
1156 + else if (op == '+') {
1157 + /* Emit x+ as x(&|), where & means "self". */
1158 + next = regnode(BRANCH); /* Either */
1159 + regtail(ret, next);
1160 + regtail(regnode(BACK), ret); /* loop back */
1161 + regtail(next, regnode(BRANCH)); /* or */
1162 + regtail(ret, regnode(NOTHING)); /* null. */
1163 + } else if (op == '?') {
1164 + /* Emit x? as (x|) */
1165 + reginsert(BRANCH, ret); /* Either x */
1166 + regtail(ret, regnode(BRANCH)); /* or */
1167 + next = regnode(NOTHING); /* null. */
1168 + regtail(ret, next);
1169 + regoptail(ret, next);
1170 + }
1171 + regparse++;
1172 + if (ISMULT(*regparse))
1173 + FAIL("nested *?+");
1174 +
1175 + return(ret);
1176 +}
1177 +
1178 +/*
1179 + - regatom - the lowest level
1180 + *
1181 + * Optimization: gobbles an entire sequence of ordinary characters so that
1182 + * it can turn them into a single node, which is smaller to store and
1183 + * faster to run. Backslashed characters are exceptions, each becoming a
1184 + * separate node; the code is simpler that way and it's not worth fixing.
1185 + */
1186 +static char *
1187 +regatom(int *flagp)
1188 +{
1189 + register char *ret;
1190 + int flags;
1191 +
1192 + *flagp = WORST; /* Tentatively. */
1193 +
1194 + switch (*regparse++) {
1195 + case '^':
1196 + ret = regnode(BOL);
1197 + break;
1198 + case '$':
1199 + ret = regnode(EOL);
1200 + break;
1201 + case '.':
1202 + ret = regnode(ANY);
1203 + *flagp |= HASWIDTH|SIMPLE;
1204 + break;
1205 + case '[': {
1206 + register int class;
1207 + register int classend;
1208 +
1209 + if (*regparse == '^') { /* Complement of range. */
1210 + ret = regnode(ANYBUT);
1211 + regparse++;
1212 + } else
1213 + ret = regnode(ANYOF);
1214 + if (*regparse == ']' || *regparse == '-')
1215 + regc(*regparse++);
1216 + while (*regparse != '\0' && *regparse != ']') {
1217 + if (*regparse == '-') {
1218 + regparse++;
1219 + if (*regparse == ']' || *regparse == '\0')
1220 + regc('-');
1221 + else {
1222 + class = UCHARAT(regparse-2)+1;
1223 + classend = UCHARAT(regparse);
1224 + if (class > classend+1)
1225 + FAIL("invalid [] range");
1226 + for (; class <= classend; class++)
1227 + regc(class);
1228 + regparse++;
1229 + }
1230 + } else
1231 + regc(*regparse++);
1232 + }
1233 + regc('\0');
1234 + if (*regparse != ']')
1235 + FAIL("unmatched []");
1236 + regparse++;
1237 + *flagp |= HASWIDTH|SIMPLE;
1238 + }
1239 + break;
1240 + case '(':
1241 + ret = reg(1, &flags);
1242 + if (ret == NULL)
1243 + return(NULL);
1244 + *flagp |= flags&(HASWIDTH|SPSTART);
1245 + break;
1246 + case '\0':
1247 + case '|':
1248 + case ')':
1249 + FAIL("internal urp"); /* Supposed to be caught earlier. */
1250 + break;
1251 + case '?':
1252 + case '+':
1253 + case '*':
1254 + FAIL("?+* follows nothing");
1255 + break;
1256 + case '\\':
1257 + if (*regparse == '\0')
1258 + FAIL("trailing \\");
1259 + ret = regnode(EXACTLY);
1260 + regc(*regparse++);
1261 + regc('\0');
1262 + *flagp |= HASWIDTH|SIMPLE;
1263 + break;
1264 + default: {
1265 + register int len;
1266 + register char ender;
1267 +
1268 + regparse--;
1269 + len = my_strcspn((const char *)regparse, (const char *)META);
1270 + if (len <= 0)
1271 + FAIL("internal disaster");
1272 + ender = *(regparse+len);
1273 + if (len > 1 && ISMULT(ender))
1274 + len--; /* Back off clear of ?+* operand. */
1275 + *flagp |= HASWIDTH;
1276 + if (len == 1)
1277 + *flagp |= SIMPLE;
1278 + ret = regnode(EXACTLY);
1279 + while (len > 0) {
1280 + regc(*regparse++);
1281 + len--;
1282 + }
1283 + regc('\0');
1284 + }
1285 + break;
1286 + }
1287 +
1288 + return(ret);
1289 +}
1290 +
1291 +/*
1292 + - regnode - emit a node
1293 + */
1294 +static char * /* Location. */
1295 +regnode(char op)
1296 +{
1297 + register char *ret;
1298 + register char *ptr;
1299 +
1300 + ret = regcode;
1301 + if (ret == &regdummy) {
1302 + regsize += 3;
1303 + return(ret);
1304 + }
1305 +
1306 + ptr = ret;
1307 + *ptr++ = op;
1308 + *ptr++ = '\0'; /* Null "next" pointer. */
1309 + *ptr++ = '\0';
1310 + regcode = ptr;
1311 +
1312 + return(ret);
1313 +}
1314 +
1315 +/*
1316 + - regc - emit (if appropriate) a byte of code
1317 + */
1318 +static void
1319 +regc(char b)
1320 +{
1321 + if (regcode != &regdummy)
1322 + *regcode++ = b;
1323 + else
1324 + regsize++;
1325 +}
1326 +
1327 +/*
1328 + - reginsert - insert an operator in front of already-emitted operand
1329 + *
1330 + * Means relocating the operand.
1331 + */
1332 +static void
1333 +reginsert(char op, char* opnd)
1334 +{
1335 + register char *src;
1336 + register char *dst;
1337 + register char *place;
1338 +
1339 + if (regcode == &regdummy) {
1340 + regsize += 3;
1341 + return;
1342 + }
1343 +
1344 + src = regcode;
1345 + regcode += 3;
1346 + dst = regcode;
1347 + while (src > opnd)
1348 + *--dst = *--src;
1349 +
1350 + place = opnd; /* Op node, where operand used to be. */
1351 + *place++ = op;
1352 + *place++ = '\0';
1353 + *place++ = '\0';
1354 +}
1355 +
1356 +/*
1357 + - regtail - set the next-pointer at the end of a node chain
1358 + */
1359 +static void
1360 +regtail(char *p, char *val)
1361 +{
1362 + register char *scan;
1363 + register char *temp;
1364 + register int offset;
1365 +
1366 + if (p == &regdummy)
1367 + return;
1368 +
1369 + /* Find last node. */
1370 + scan = p;
1371 + for (;;) {
1372 + temp = regnext(scan);
1373 + if (temp == NULL)
1374 + break;
1375 + scan = temp;
1376 + }
1377 +
1378 + if (OP(scan) == BACK)
1379 + offset = scan - val;
1380 + else
1381 + offset = val - scan;
1382 + *(scan+1) = (offset>>8)&0377;
1383 + *(scan+2) = offset&0377;
1384 +}
1385 +
1386 +/*
1387 + - regoptail - regtail on operand of first argument; nop if operandless
1388 + */
1389 +static void
1390 +regoptail(char *p, char *val)
1391 +{
1392 + /* "Operandless" and "op != BRANCH" are synonymous in practice. */
1393 + if (p == NULL || p == &regdummy || OP(p) != BRANCH)
1394 + return;
1395 + regtail(OPERAND(p), val);
1396 +}
1397 +
1398 +/*
1399 + * regexec and friends
1400 + */
1401 +
1402 +/*
1403 + * Global work variables for regexec().
1404 + */
1405 +static char *reginput; /* String-input pointer. */
1406 +static char *regbol; /* Beginning of input, for ^ check. */
1407 +static char **regstartp; /* Pointer to startp array. */
1408 +static char **regendp; /* Ditto for endp. */
1409 +
1410 +/*
1411 + * Forwards.
1412 + */
1413 +STATIC int regtry(regexp *prog, char *string);
1414 +STATIC int regmatch(char *prog);
1415 +STATIC int regrepeat(char *p);
1416 +
1417 +#ifdef DEBUG
1418 +int regnarrate = 0;
1419 +void regdump();
1420 +STATIC char *regprop(char *op);
1421 +#endif
1422 +
1423 +/*
1424 + - regexec - match a regexp against a string
1425 + */
1426 +int
1427 +regexec(regexp *prog, char *string)
1428 +{
1429 + register char *s;
1430 +
1431 + /* Be paranoid... */
1432 + if (prog == NULL || string == NULL) {
1433 + printk("<3>Regexp: NULL parameter\n");
1434 + return(0);
1435 + }
1436 +
1437 + /* Check validity of program. */
1438 + if (UCHARAT(prog->program) != MAGIC) {
1439 + printk("<3>Regexp: corrupted program\n");
1440 + return(0);
1441 + }
1442 +
1443 + /* If there is a "must appear" string, look for it. */
1444 + if (prog->regmust != NULL) {
1445 + s = string;
1446 + while ((s = strchr(s, prog->regmust[0])) != NULL) {
1447 + if (strncmp(s, prog->regmust, prog->regmlen) == 0)
1448 + break; /* Found it. */
1449 + s++;
1450 + }
1451 + if (s == NULL) /* Not present. */
1452 + return(0);
1453 + }
1454 +
1455 + /* Mark beginning of line for ^ . */
1456 + regbol = string;
1457 +
1458 + /* Simplest case: anchored match need be tried only once. */
1459 + if (prog->reganch)
1460 + return(regtry(prog, string));
1461 +
1462 + /* Messy cases: unanchored match. */
1463 + s = string;
1464 + if (prog->regstart != '\0')
1465 + /* We know what char it must start with. */
1466 + while ((s = strchr(s, prog->regstart)) != NULL) {
1467 + if (regtry(prog, s))
1468 + return(1);
1469 + s++;
1470 + }
1471 + else
1472 + /* We don't -- general case. */
1473 + do {
1474 + if (regtry(prog, s))
1475 + return(1);
1476 + } while (*s++ != '\0');
1477 +
1478 + /* Failure. */
1479 + return(0);
1480 +}
1481 +
1482 +/*
1483 + - regtry - try match at specific point
1484 + */
1485 +static int /* 0 failure, 1 success */
1486 +regtry(regexp *prog, char *string)
1487 +{
1488 + register int i;
1489 + register char **sp;
1490 + register char **ep;
1491 +
1492 + reginput = string;
1493 + regstartp = prog->startp;
1494 + regendp = prog->endp;
1495 +
1496 + sp = prog->startp;
1497 + ep = prog->endp;
1498 + for (i = NSUBEXP; i > 0; i--) {
1499 + *sp++ = NULL;
1500 + *ep++ = NULL;
1501 + }
1502 + if (regmatch(prog->program + 1)) {
1503 + prog->startp[0] = string;
1504 + prog->endp[0] = reginput;
1505 + return(1);
1506 + } else
1507 + return(0);
1508 +}
1509 +
1510 +/*
1511 + - regmatch - main matching routine
1512 + *
1513 + * Conceptually the strategy is simple: check to see whether the current
1514 + * node matches, call self recursively to see whether the rest matches,
1515 + * and then act accordingly. In practice we make some effort to avoid
1516 + * recursion, in particular by going through "ordinary" nodes (that don't
1517 + * need to know whether the rest of the match failed) by a loop instead of
1518 + * by recursion.
1519 + */
1520 +static int /* 0 failure, 1 success */
1521 +regmatch(char *prog)
1522 +{
1523 + register char *scan = prog; /* Current node. */
1524 + char *next; /* Next node. */
1525 +
1526 +#ifdef DEBUG
1527 + if (scan != NULL && regnarrate)
1528 + fprintf(stderr, "%s(\n", regprop(scan));
1529 +#endif
1530 + while (scan != NULL) {
1531 +#ifdef DEBUG
1532 + if (regnarrate)
1533 + fprintf(stderr, "%s...\n", regprop(scan));
1534 +#endif
1535 + next = regnext(scan);
1536 +
1537 + switch (OP(scan)) {
1538 + case BOL:
1539 + if (reginput != regbol)
1540 + return(0);
1541 + break;
1542 + case EOL:
1543 + if (*reginput != '\0')
1544 + return(0);
1545 + break;
1546 + case ANY:
1547 + if (*reginput == '\0')
1548 + return(0);
1549 + reginput++;
1550 + break;
1551 + case EXACTLY: {
1552 + register int len;
1553 + register char *opnd;
1554 +
1555 + opnd = OPERAND(scan);
1556 + /* Inline the first character, for speed. */
1557 + if (*opnd != *reginput)
1558 + return(0);
1559 + len = strlen(opnd);
1560 + if (len > 1 && strncmp(opnd, reginput, len) != 0)
1561 + return(0);
1562 + reginput += len;
1563 + }
1564 + break;
1565 + case ANYOF:
1566 + if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) == NULL)
1567 + return(0);
1568 + reginput++;
1569 + break;
1570 + case ANYBUT:
1571 + if (*reginput == '\0' || strchr(OPERAND(scan), *reginput) != NULL)
1572 + return(0);
1573 + reginput++;
1574 + break;
1575 + case NOTHING:
1576 + case BACK:
1577 + break;
1578 + case OPEN+1:
1579 + case OPEN+2:
1580 + case OPEN+3:
1581 + case OPEN+4:
1582 + case OPEN+5:
1583 + case OPEN+6:
1584 + case OPEN+7:
1585 + case OPEN+8:
1586 + case OPEN+9: {
1587 + register int no;
1588 + register char *save;
1589 +
1590 + no = OP(scan) - OPEN;
1591 + save = reginput;
1592 +
1593 + if (regmatch(next)) {
1594 + /*
1595 + * Don't set startp if some later
1596 + * invocation of the same parentheses
1597 + * already has.
1598 + */
1599 + if (regstartp[no] == NULL)
1600 + regstartp[no] = save;
1601 + return(1);
1602 + } else
1603 + return(0);
1604 + }
1605 + break;
1606 + case CLOSE+1:
1607 + case CLOSE+2:
1608 + case CLOSE+3:
1609 + case CLOSE+4:
1610 + case CLOSE+5:
1611 + case CLOSE+6:
1612 + case CLOSE+7:
1613 + case CLOSE+8:
1614 + case CLOSE+9:
1615 + {
1616 + register int no;
1617 + register char *save;
1618 +
1619 + no = OP(scan) - CLOSE;
1620 + save = reginput;
1621 +
1622 + if (regmatch(next)) {
1623 + /*
1624 + * Don't set endp if some later
1625 + * invocation of the same parentheses
1626 + * already has.
1627 + */
1628 + if (regendp[no] == NULL)
1629 + regendp[no] = save;
1630 + return(1);
1631 + } else
1632 + return(0);
1633 + }
1634 + break;
1635 + case BRANCH: {
1636 + register char *save;
1637 +
1638 + if (OP(next) != BRANCH) /* No choice. */
1639 + next = OPERAND(scan); /* Avoid recursion. */
1640 + else {
1641 + do {
1642 + save = reginput;
1643 + if (regmatch(OPERAND(scan)))
1644 + return(1);
1645 + reginput = save;
1646 + scan = regnext(scan);
1647 + } while (scan != NULL && OP(scan) == BRANCH);
1648 + return(0);
1649 + /* NOTREACHED */
1650 + }
1651 + }
1652 + break;
1653 + case STAR:
1654 + case PLUS: {
1655 + register char nextch;
1656 + register int no;
1657 + register char *save;
1658 + register int min;
1659 +
1660 + /*
1661 + * Lookahead to avoid useless match attempts
1662 + * when we know what character comes next.
1663 + */
1664 + nextch = '\0';
1665 + if (OP(next) == EXACTLY)
1666 + nextch = *OPERAND(next);
1667 + min = (OP(scan) == STAR) ? 0 : 1;
1668 + save = reginput;
1669 + no = regrepeat(OPERAND(scan));
1670 + while (no >= min) {
1671 + /* If it could work, try it. */
1672 + if (nextch == '\0' || *reginput == nextch)
1673 + if (regmatch(next))
1674 + return(1);
1675 + /* Couldn't or didn't -- back up. */
1676 + no--;
1677 + reginput = save + no;
1678 + }
1679 + return(0);
1680 + }
1681 + break;
1682 + case END:
1683 + return(1); /* Success! */
1684 + break;
1685 + default:
1686 + printk("<3>Regexp: memory corruption\n");
1687 + return(0);
1688 + break;
1689 + }
1690 +
1691 + scan = next;
1692 + }
1693 +
1694 + /*
1695 + * We get here only if there's trouble -- normally "case END" is
1696 + * the terminating point.
1697 + */
1698 + printk("<3>Regexp: corrupted pointers\n");
1699 + return(0);
1700 +}
1701 +
1702 +/*
1703 + - regrepeat - repeatedly match something simple, report how many
1704 + */
1705 +static int
1706 +regrepeat(char *p)
1707 +{
1708 + register int count = 0;
1709 + register char *scan;
1710 + register char *opnd;
1711 +
1712 + scan = reginput;
1713 + opnd = OPERAND(p);
1714 + switch (OP(p)) {
1715 + case ANY:
1716 + count = strlen(scan);
1717 + scan += count;
1718 + break;
1719 + case EXACTLY:
1720 + while (*opnd == *scan) {
1721 + count++;
1722 + scan++;
1723 + }
1724 + break;
1725 + case ANYOF:
1726 + while (*scan != '\0' && strchr(opnd, *scan) != NULL) {
1727 + count++;
1728 + scan++;
1729 + }
1730 + break;
1731 + case ANYBUT:
1732 + while (*scan != '\0' && strchr(opnd, *scan) == NULL) {
1733 + count++;
1734 + scan++;
1735 + }
1736 + break;
1737 + default: /* Oh dear. Called inappropriately. */
1738 + printk("<3>Regexp: internal foulup\n");
1739 + count = 0; /* Best compromise. */
1740 + break;
1741 + }
1742 + reginput = scan;
1743 +
1744 + return(count);
1745 +}
1746 +
1747 +/*
1748 + - regnext - dig the "next" pointer out of a node
1749 + */
1750 +static char*
1751 +regnext(char *p)
1752 +{
1753 + register int offset;
1754 +
1755 + if (p == &regdummy)
1756 + return(NULL);
1757 +
1758 + offset = NEXT(p);
1759 + if (offset == 0)
1760 + return(NULL);
1761 +
1762 + if (OP(p) == BACK)
1763 + return(p-offset);
1764 + else
1765 + return(p+offset);
1766 +}
1767 +
1768 +#ifdef DEBUG
1769 +
1770 +STATIC char *regprop();
1771 +
1772 +/*
1773 + - regdump - dump a regexp onto stdout in vaguely comprehensible form
1774 + */
1775 +void
1776 +regdump(regexp *r)
1777 +{
1778 + register char *s;
1779 + register char op = EXACTLY; /* Arbitrary non-END op. */
1780 + register char *next;
1781 + /* extern char *strchr(); */
1782 +
1783 +
1784 + s = r->program + 1;
1785 + while (op != END) { /* While that wasn't END last time... */
1786 + op = OP(s);
1787 + printf("%2d%s", s-r->program, regprop(s)); /* Where, what. */
1788 + next = regnext(s);
1789 + if (next == NULL) /* Next ptr. */
1790 + printf("(0)");
1791 + else
1792 + printf("(%d)", (s-r->program)+(next-s));
1793 + s += 3;
1794 + if (op == ANYOF || op == ANYBUT || op == EXACTLY) {
1795 + /* Literal string, where present. */
1796 + while (*s != '\0') {
1797 + putchar(*s);
1798 + s++;
1799 + }
1800 + s++;
1801 + }
1802 + putchar('\n');
1803 + }
1804 +
1805 + /* Header fields of interest. */
1806 + if (r->regstart != '\0')
1807 + printf("start `%c' ", r->regstart);
1808 + if (r->reganch)
1809 + printf("anchored ");
1810 + if (r->regmust != NULL)
1811 + printf("must have \"%s\"", r->regmust);
1812 + printf("\n");
1813 +}
1814 +
1815 +/*
1816 + - regprop - printable representation of opcode
1817 + */
1818 +static char *
1819 +regprop(char *op)
1820 +{
1821 +#define BUFLEN 50
1822 + register char *p;
1823 + static char buf[BUFLEN];
1824 +
1825 + strcpy(buf, ":");
1826 +
1827 + switch (OP(op)) {
1828 + case BOL:
1829 + p = "BOL";
1830 + break;
1831 + case EOL:
1832 + p = "EOL";
1833 + break;
1834 + case ANY:
1835 + p = "ANY";
1836 + break;
1837 + case ANYOF:
1838 + p = "ANYOF";
1839 + break;
1840 + case ANYBUT:
1841 + p = "ANYBUT";
1842 + break;
1843 + case BRANCH:
1844 + p = "BRANCH";
1845 + break;
1846 + case EXACTLY:
1847 + p = "EXACTLY";
1848 + break;
1849 + case NOTHING:
1850 + p = "NOTHING";
1851 + break;
1852 + case BACK:
1853 + p = "BACK";
1854 + break;
1855 + case END:
1856 + p = "END";
1857 + break;
1858 + case OPEN+1:
1859 + case OPEN+2:
1860 + case OPEN+3:
1861 + case OPEN+4:
1862 + case OPEN+5:
1863 + case OPEN+6:
1864 + case OPEN+7:
1865 + case OPEN+8:
1866 + case OPEN+9:
1867 + snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN);
1868 + p = NULL;
1869 + break;
1870 + case CLOSE+1:
1871 + case CLOSE+2:
1872 + case CLOSE+3:
1873 + case CLOSE+4:
1874 + case CLOSE+5:
1875 + case CLOSE+6:
1876 + case CLOSE+7:
1877 + case CLOSE+8:
1878 + case CLOSE+9:
1879 + snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE);
1880 + p = NULL;
1881 + break;
1882 + case STAR:
1883 + p = "STAR";
1884 + break;
1885 + case PLUS:
1886 + p = "PLUS";
1887 + break;
1888 + default:
1889 + printk("<3>Regexp: corrupted opcode\n");
1890 + break;
1891 + }
1892 + if (p != NULL)
1893 + strncat(buf, p, BUFLEN-strlen(buf));
1894 + return(buf);
1895 +}
1896 +#endif
1897 +
1898 +
1899 diff -Nurp linux-2.4.30/net/ipv4/netfilter/regexp/regexp.h linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regexp.h
1900 --- linux-2.4.30/net/ipv4/netfilter/regexp/regexp.h 1969-12-31 18:00:00.000000000 -0600
1901 +++ linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regexp.h 2005-05-03 18:37:03.000000000 -0500
1902 @@ -0,0 +1,40 @@
1903 +/*
1904 + * Definitions etc. for regexp(3) routines.
1905 + *
1906 + * Caveat: this is V8 regexp(3) [actually, a reimplementation thereof],
1907 + * not the System V one.
1908 + */
1909 +
1910 +#ifndef REGEXP_H
1911 +#define REGEXP_H
1912 +
1913 +/*
1914 +http://www.opensource.apple.com/darwinsource/10.3/expect-1/expect/expect.h ,
1915 +which contains a version of this library, says:
1916 +
1917 + *
1918 + * NSUBEXP must be at least 10, and no greater than 117 or the parser
1919 + * will not work properly.
1920 + *
1921 +
1922 +However, it looks rather like this library is limited to 10. If you think
1923 +otherwise, let us know.
1924 +*/
1925 +
1926 +#define NSUBEXP 10
1927 +typedef struct regexp {
1928 + char *startp[NSUBEXP];
1929 + char *endp[NSUBEXP];
1930 + char regstart; /* Internal use only. */
1931 + char reganch; /* Internal use only. */
1932 + char *regmust; /* Internal use only. */
1933 + int regmlen; /* Internal use only. */
1934 + char program[1]; /* Unwarranted chumminess with compiler. */
1935 +} regexp;
1936 +
1937 +regexp * regcomp(char *exp, int *patternsize);
1938 +int regexec(regexp *prog, char *string);
1939 +void regsub(regexp *prog, char *source, char *dest);
1940 +void regerror(char *s);
1941 +
1942 +#endif
1943 diff -Nurp linux-2.4.30/net/ipv4/netfilter/regexp/regmagic.h linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regmagic.h
1944 --- linux-2.4.30/net/ipv4/netfilter/regexp/regmagic.h 1969-12-31 18:00:00.000000000 -0600
1945 +++ linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regmagic.h 2005-05-03 18:37:03.000000000 -0500
1946 @@ -0,0 +1,5 @@
1947 +/*
1948 + * The first byte of the regexp internal "program" is actually this magic
1949 + * number; the start node begins in the second byte.
1950 + */
1951 +#define MAGIC 0234
1952 diff -Nurp linux-2.4.30/net/ipv4/netfilter/regexp/regsub.c linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regsub.c
1953 --- linux-2.4.30/net/ipv4/netfilter/regexp/regsub.c 1969-12-31 18:00:00.000000000 -0600
1954 +++ linux-2.4.30-layer7/net/ipv4/netfilter/regexp/regsub.c 2005-05-03 18:37:03.000000000 -0500
1955 @@ -0,0 +1,95 @@
1956 +/*
1957 + * regsub
1958 + * @(#)regsub.c 1.3 of 2 April 86
1959 + *
1960 + * Copyright (c) 1986 by University of Toronto.
1961 + * Written by Henry Spencer. Not derived from licensed software.
1962 + *
1963 + * Permission is granted to anyone to use this software for any
1964 + * purpose on any computer system, and to redistribute it freely,
1965 + * subject to the following restrictions:
1966 + *
1967 + * 1. The author is not responsible for the consequences of use of
1968 + * this software, no matter how awful, even if they arise
1969 + * from defects in it.
1970 + *
1971 + * 2. The origin of this software must not be misrepresented, either
1972 + * by explicit claim or by omission.
1973 + *
1974 + * 3. Altered versions must be plainly marked as such, and must not
1975 + * be misrepresented as being the original software.
1976 + *
1977 + *
1978 + * This code was modified by Ethan Sommer to work within the kernel
1979 + * (it now uses kmalloc etc..)
1980 + *
1981 + */
1982 +#include "regexp.h"
1983 +#include "regmagic.h"
1984 +#include <linux/string.h>
1985 +
1986 +
1987 +#ifndef CHARBITS
1988 +#define UCHARAT(p) ((int)*(unsigned char *)(p))
1989 +#else
1990 +#define UCHARAT(p) ((int)*(p)&CHARBITS)
1991 +#endif
1992 +
1993 +#if 0
1994 +//void regerror(char * s)
1995 +//{
1996 +// printk("regexp(3): %s", s);
1997 +// /* NOTREACHED */
1998 +//}
1999 +#endif
2000 +
2001 +/*
2002 + - regsub - perform substitutions after a regexp match
2003 + */
2004 +void
2005 +regsub(regexp * prog, char * source, char * dest)
2006 +{
2007 + register char *src;
2008 + register char *dst;
2009 + register char c;
2010 + register int no;
2011 + register int len;
2012 +
2013 + /* Not necessary and gcc doesn't like it -MLS */
2014 + /*extern char *strncpy();*/
2015 +
2016 + if (prog == NULL || source == NULL || dest == NULL) {
2017 + regerror("NULL parm to regsub");
2018 + return;
2019 + }
2020 + if (UCHARAT(prog->program) != MAGIC) {
2021 + regerror("damaged regexp fed to regsub");
2022 + return;
2023 + }
2024 +
2025 + src = source;
2026 + dst = dest;
2027 + while ((c = *src++) != '\0') {
2028 + if (c == '&')
2029 + no = 0;
2030 + else if (c == '\\' && '0' <= *src && *src <= '9')
2031 + no = *src++ - '0';
2032 + else
2033 + no = -1;
2034 +
2035 + if (no < 0) { /* Ordinary character. */
2036 + if (c == '\\' && (*src == '\\' || *src == '&'))
2037 + c = *src++;
2038 + *dst++ = c;
2039 + } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) {
2040 + len = prog->endp[no] - prog->startp[no];
2041 + (void) strncpy(dst, prog->startp[no], len);
2042 + dst += len;
2043 + if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */
2044 + regerror("damaged match string");
2045 + return;
2046 + }
2047 + }
2048 + }
2049 + *dst++ = '\0';
2050 +}
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