* published by the Free Software Foundation.
*/
-#include <linux/config.h>
#include <linux/module.h>
#include <linux/netfilter.h>
#include <linux/ip.h>
#include <net/checksum.h>
#include <net/tcp.h>
-#include <linux/netfilter_ipv4/lockhelp.h>
#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
#include <linux/netfilter_ipv4/ip_conntrack_ftp.h>
#include <linux/moduleparam.h>
MODULE_DESCRIPTION("ftp connection tracking helper");
/* This is slow, but it's simple. --RR */
-static char ftp_buffer[65536];
-
-static DECLARE_LOCK(ip_ftp_lock);
+static char *ftp_buffer;
+static DEFINE_SPINLOCK(ip_ftp_lock);
#define MAX_PORTS 8
-static int ports[MAX_PORTS];
+static unsigned short ports[MAX_PORTS];
static int ports_c;
-module_param_array(ports, int, &ports_c, 0400);
+module_param_array(ports, ushort, &ports_c, 0400);
static int loose;
-module_param(loose, int, 0600);
+module_param(loose, bool, 0600);
unsigned int (*ip_nat_ftp_hook)(struct sk_buff **pskb,
enum ip_conntrack_info ctinfo,
static int try_eprt(const char *, size_t, u_int32_t [], char);
static int try_epsv_response(const char *, size_t, u_int32_t [], char);
-static struct ftp_search {
- enum ip_conntrack_dir dir;
+static const struct ftp_search {
const char *pattern;
size_t plen;
char skip;
char term;
enum ip_ct_ftp_type ftptype;
int (*getnum)(const char *, size_t, u_int32_t[], char);
-} search[] = {
- {
- IP_CT_DIR_ORIGINAL,
- "PORT", sizeof("PORT") - 1, ' ', '\r',
- IP_CT_FTP_PORT,
- try_rfc959,
- },
- {
- IP_CT_DIR_REPLY,
- "227 ", sizeof("227 ") - 1, '(', ')',
- IP_CT_FTP_PASV,
- try_rfc959,
- },
- {
- IP_CT_DIR_ORIGINAL,
- "EPRT", sizeof("EPRT") - 1, ' ', '\r',
- IP_CT_FTP_EPRT,
- try_eprt,
+} search[IP_CT_DIR_MAX][2] = {
+ [IP_CT_DIR_ORIGINAL] = {
+ {
+ .pattern = "PORT",
+ .plen = sizeof("PORT") - 1,
+ .skip = ' ',
+ .term = '\r',
+ .ftptype = IP_CT_FTP_PORT,
+ .getnum = try_rfc959,
+ },
+ {
+ .pattern = "EPRT",
+ .plen = sizeof("EPRT") - 1,
+ .skip = ' ',
+ .term = '\r',
+ .ftptype = IP_CT_FTP_EPRT,
+ .getnum = try_eprt,
+ },
},
- {
- IP_CT_DIR_REPLY,
- "229 ", sizeof("229 ") - 1, '(', ')',
- IP_CT_FTP_EPSV,
- try_epsv_response,
+ [IP_CT_DIR_REPLY] = {
+ {
+ .pattern = "227 ",
+ .plen = sizeof("227 ") - 1,
+ .skip = '(',
+ .term = ')',
+ .ftptype = IP_CT_FTP_PASV,
+ .getnum = try_rfc959,
+ },
+ {
+ .pattern = "229 ",
+ .plen = sizeof("229 ") - 1,
+ .skip = '(',
+ .term = ')',
+ .ftptype = IP_CT_FTP_EPSV,
+ .getnum = try_epsv_response,
+ },
},
};
}
/* We don't update if it's older than what we have. */
-static void update_nl_seq(u32 nl_seq, struct ip_ct_ftp_master *info, int dir)
+static void update_nl_seq(u32 nl_seq, struct ip_ct_ftp_master *info, int dir,
+ struct sk_buff *skb)
{
unsigned int i, oldest = NUM_SEQ_TO_REMEMBER;
oldest = i;
}
- if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER)
+ if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) {
info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq;
- else if (oldest != NUM_SEQ_TO_REMEMBER)
+ ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb);
+ } else if (oldest != NUM_SEQ_TO_REMEMBER) {
info->seq_aft_nl[dir][oldest] = nl_seq;
+ ip_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb);
+ }
}
static int help(struct sk_buff **pskb,
struct ip_conntrack_expect *exp;
unsigned int i;
int found = 0, ends_in_nl;
+ typeof(ip_nat_ftp_hook) ip_nat_ftp;
/* Until there's been traffic both ways, don't look in packets. */
if (ctinfo != IP_CT_ESTABLISHED
}
datalen = (*pskb)->len - dataoff;
- LOCK_BH(&ip_ftp_lock);
+ spin_lock_bh(&ip_ftp_lock);
fb_ptr = skb_header_pointer(*pskb, dataoff,
(*pskb)->len - dataoff, ftp_buffer);
BUG_ON(fb_ptr == NULL);
array[2] = (ntohl(ct->tuplehash[dir].tuple.src.ip) >> 8) & 0xFF;
array[3] = ntohl(ct->tuplehash[dir].tuple.src.ip) & 0xFF;
- for (i = 0; i < ARRAY_SIZE(search); i++) {
- if (search[i].dir != dir) continue;
-
+ for (i = 0; i < ARRAY_SIZE(search[dir]); i++) {
found = find_pattern(fb_ptr, (*pskb)->len - dataoff,
- search[i].pattern,
- search[i].plen,
- search[i].skip,
- search[i].term,
+ search[dir][i].pattern,
+ search[dir][i].plen,
+ search[dir][i].skip,
+ search[dir][i].term,
&matchoff, &matchlen,
array,
- search[i].getnum);
+ search[dir][i].getnum);
if (found) break;
}
if (found == -1) {
this case. */
if (net_ratelimit())
printk("conntrack_ftp: partial %s %u+%u\n",
- search[i].pattern,
+ search[dir][i].pattern,
ntohl(th->seq), datalen);
ret = NF_DROP;
goto out;
fb_ptr + matchoff, matchlen, ntohl(th->seq) + matchoff);
/* Allocate expectation which will be inserted */
- exp = ip_conntrack_expect_alloc();
+ exp = ip_conntrack_expect_alloc(ct);
if (exp == NULL) {
ret = NF_DROP;
goto out;
networks, or the packet filter itself). */
if (!loose) {
ret = NF_ACCEPT;
- ip_conntrack_expect_free(exp);
- goto out_update_nl;
+ goto out_put_expect;
}
exp->tuple.dst.ip = htonl((array[0] << 24) | (array[1] << 16)
| (array[2] << 8) | array[3]);
exp->tuple.src.u.tcp.port = 0; /* Don't care. */
exp->tuple.dst.protonum = IPPROTO_TCP;
exp->mask = ((struct ip_conntrack_tuple)
- { { 0xFFFFFFFF, { 0 } },
- { 0xFFFFFFFF, { .tcp = { 0xFFFF } }, 0xFF }});
+ { { htonl(0xFFFFFFFF), { 0 } },
+ { htonl(0xFFFFFFFF), { .tcp = { htons(0xFFFF) } }, 0xFF }});
exp->expectfn = NULL;
- exp->master = ct;
+ exp->flags = 0;
/* Now, NAT might want to mangle the packet, and register the
* (possibly changed) expectation itself. */
- if (ip_nat_ftp_hook)
- ret = ip_nat_ftp_hook(pskb, ctinfo, search[i].ftptype,
- matchoff, matchlen, exp, &seq);
+ ip_nat_ftp = rcu_dereference(ip_nat_ftp_hook);
+ if (ip_nat_ftp)
+ ret = ip_nat_ftp(pskb, ctinfo, search[dir][i].ftptype,
+ matchoff, matchlen, exp, &seq);
else {
/* Can't expect this? Best to drop packet now. */
- if (ip_conntrack_expect_related(exp) != 0) {
- ip_conntrack_expect_free(exp);
+ if (ip_conntrack_expect_related(exp) != 0)
ret = NF_DROP;
- } else
+ else
ret = NF_ACCEPT;
}
+out_put_expect:
+ ip_conntrack_expect_put(exp);
+
out_update_nl:
/* Now if this ends in \n, update ftp info. Seq may have been
* adjusted by NAT code. */
if (ends_in_nl)
- update_nl_seq(seq, ct_ftp_info,dir);
+ update_nl_seq(seq, ct_ftp_info,dir, *pskb);
out:
- UNLOCK_BH(&ip_ftp_lock);
+ spin_unlock_bh(&ip_ftp_lock);
return ret;
}
static struct ip_conntrack_helper ftp[MAX_PORTS];
-static char ftp_names[MAX_PORTS][10];
+static char ftp_names[MAX_PORTS][sizeof("ftp-65535")];
/* Not __exit: called from init() */
-static void fini(void)
+static void ip_conntrack_ftp_fini(void)
{
int i;
for (i = 0; i < ports_c; i++) {
ports[i]);
ip_conntrack_helper_unregister(&ftp[i]);
}
+
+ kfree(ftp_buffer);
}
-static int __init init(void)
+static int __init ip_conntrack_ftp_init(void)
{
int i, ret;
char *tmpname;
+ ftp_buffer = kmalloc(65536, GFP_KERNEL);
+ if (!ftp_buffer)
+ return -ENOMEM;
+
if (ports_c == 0)
ports[ports_c++] = FTP_PORT;
for (i = 0; i < ports_c; i++) {
ftp[i].tuple.src.u.tcp.port = htons(ports[i]);
ftp[i].tuple.dst.protonum = IPPROTO_TCP;
- ftp[i].mask.src.u.tcp.port = 0xFFFF;
+ ftp[i].mask.src.u.tcp.port = htons(0xFFFF);
ftp[i].mask.dst.protonum = 0xFF;
ftp[i].max_expected = 1;
ftp[i].timeout = 5 * 60; /* 5 minutes */
ret = ip_conntrack_helper_register(&ftp[i]);
if (ret) {
- fini();
+ ip_conntrack_ftp_fini();
return ret;
}
}
return 0;
}
-module_init(init);
-module_exit(fini);
+module_init(ip_conntrack_ftp_init);
+module_exit(ip_conntrack_ftp_fini);
git://git.onelab.eu / linux-2.6.git / blobdiff