[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / netfilter / nf_conntrack_ftp.c

/* FTP extension for connection tracking. */

/* (C) 1999-2001 Paul `Rusty' Russell
 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
 * (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
 * (C) 2006-2012 Patrick McHardy <kaber@trash.net>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/netfilter.h>
#include <linux/ip.h>
#include <linux/slab.h>
#include <linux/ipv6.h>
#include <linux/ctype.h>
#include <linux/inet.h>
#include <net/checksum.h>
#include <net/tcp.h>

#include <net/netfilter/nf_conntrack.h>
#include <net/netfilter/nf_conntrack_expect.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_conntrack_helper.h>
#include <linux/netfilter/nf_conntrack_ftp.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
MODULE_DESCRIPTION("ftp connection tracking helper");
MODULE_ALIAS("ip_conntrack_ftp");
MODULE_ALIAS_NFCT_HELPER("ftp");

/* This is slow, but it's simple. --RR */
static char *ftp_buffer;

static DEFINE_SPINLOCK(nf_ftp_lock);

#define MAX_PORTS 8
static u_int16_t ports[MAX_PORTS];
static unsigned int ports_c;
module_param_array(ports, ushort, &ports_c, 0400);

static bool loose;
module_param(loose, bool, 0600);

unsigned int (*nf_nat_ftp_hook)(struct sk_buff *skb,
				enum ip_conntrack_info ctinfo,
				enum nf_ct_ftp_type type,
				unsigned int protoff,
				unsigned int matchoff,
				unsigned int matchlen,
				struct nf_conntrack_expect *exp);
EXPORT_SYMBOL_GPL(nf_nat_ftp_hook);

static int try_rfc959(const char *, size_t, struct nf_conntrack_man *, char);
static int try_eprt(const char *, size_t, struct nf_conntrack_man *, char);
static int try_epsv_response(const char *, size_t, struct nf_conntrack_man *,
			     char);

static struct ftp_search {
	const char *pattern;
	size_t plen;
	char skip;
	char term;
	enum nf_ct_ftp_type ftptype;
	int (*getnum)(const char *, size_t, struct nf_conntrack_man *, char);
} search[IP_CT_DIR_MAX][2] = {
	[IP_CT_DIR_ORIGINAL] = {
		{
			.pattern	= "PORT",
			.plen		= sizeof("PORT") - 1,
			.skip		= ' ',
			.term		= '\r',
			.ftptype	= NF_CT_FTP_PORT,
			.getnum		= try_rfc959,
		},
		{
			.pattern	= "EPRT",
			.plen		= sizeof("EPRT") - 1,
			.skip		= ' ',
			.term		= '\r',
			.ftptype	= NF_CT_FTP_EPRT,
			.getnum		= try_eprt,
		},
	},
	[IP_CT_DIR_REPLY] = {
		{
			.pattern	= "227 ",
			.plen		= sizeof("227 ") - 1,
			.skip		= '(',
			.term		= ')',
			.ftptype	= NF_CT_FTP_PASV,
			.getnum		= try_rfc959,
		},
		{
			.pattern	= "229 ",
			.plen		= sizeof("229 ") - 1,
			.skip		= '(',
			.term		= ')',
			.ftptype	= NF_CT_FTP_EPSV,
			.getnum		= try_epsv_response,
		},
	},
};

static int
get_ipv6_addr(const char *src, size_t dlen, struct in6_addr *dst, u_int8_t term)
{
	const char *end;
	int ret = in6_pton(src, min_t(size_t, dlen, 0xffff), (u8 *)dst, term, &end);
	if (ret > 0)
		return (int)(end - src);
	return 0;
}

static int try_number(const char *data, size_t dlen, u_int32_t array[],
		      int array_size, char sep, char term)
{
	u_int32_t i, len;

	memset(array, 0, sizeof(array[0])*array_size);

	/* Keep data pointing at next char. */
	for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) {
		if (*data >= '0' && *data <= '9') {
			array[i] = array[i]*10 + *data - '0';
		}
		else if (*data == sep)
			i++;
		else {
			/* Unexpected character; true if it's the
			   terminator and we're finished. */
			if (*data == term && i == array_size - 1)
				return len;

			pr_debug("Char %u (got %u nums) `%u' unexpected\n",
				 len, i, *data);
			return 0;
		}
	}
	pr_debug("Failed to fill %u numbers separated by %c\n",
		 array_size, sep);
	return 0;
}

/* Returns 0, or length of numbers: 192,168,1,1,5,6 */
static int try_rfc959(const char *data, size_t dlen,
		      struct nf_conntrack_man *cmd, char term)
{
	int length;
	u_int32_t array[6];

	length = try_number(data, dlen, array, 6, ',', term);
	if (length == 0)
		return 0;

	cmd->u3.ip =  htonl((array[0] << 24) | (array[1] << 16) |
				    (array[2] << 8) | array[3]);
	cmd->u.tcp.port = htons((array[4] << 8) | array[5]);
	return length;
}

/* Grab port: number up to delimiter */
static int get_port(const char *data, int start, size_t dlen, char delim,
		    __be16 *port)
{
	u_int16_t tmp_port = 0;
	int i;

	for (i = start; i < dlen; i++) {
		/* Finished? */
		if (data[i] == delim) {
			if (tmp_port == 0)
				break;
			*port = htons(tmp_port);
			pr_debug("get_port: return %d\n", tmp_port);
			return i + 1;
		}
		else if (data[i] >= '0' && data[i] <= '9')
			tmp_port = tmp_port*10 + data[i] - '0';
		else { /* Some other crap */
			pr_debug("get_port: invalid char.\n");
			break;
		}
	}
	return 0;
}

/* Returns 0, or length of numbers: |1|132.235.1.2|6275| or |2|3ffe::1|6275| */
static int try_eprt(const char *data, size_t dlen, struct nf_conntrack_man *cmd,
		    char term)
{
	char delim;
	int length;

	/* First character is delimiter, then "1" for IPv4 or "2" for IPv6,
	   then delimiter again. */
	if (dlen <= 3) {
		pr_debug("EPRT: too short\n");
		return 0;
	}
	delim = data[0];
	if (isdigit(delim) || delim < 33 || delim > 126 || data[2] != delim) {
		pr_debug("try_eprt: invalid delimitter.\n");
		return 0;
	}

	if ((cmd->l3num == PF_INET && data[1] != '1') ||
	    (cmd->l3num == PF_INET6 && data[1] != '2')) {
		pr_debug("EPRT: invalid protocol number.\n");
		return 0;
	}

	pr_debug("EPRT: Got %c%c%c\n", delim, data[1], delim);

	if (data[1] == '1') {
		u_int32_t array[4];

		/* Now we have IP address. */
		length = try_number(data + 3, dlen - 3, array, 4, '.', delim);
		if (length != 0)
			cmd->u3.ip = htonl((array[0] << 24) | (array[1] << 16)
					   | (array[2] << 8) | array[3]);
	} else {
		/* Now we have IPv6 address. */
		length = get_ipv6_addr(data + 3, dlen - 3,
				       (struct in6_addr *)cmd->u3.ip6, delim);
	}

	if (length == 0)
		return 0;
	pr_debug("EPRT: Got IP address!\n");
	/* Start offset includes initial "|1|", and trailing delimiter */
	return get_port(data, 3 + length + 1, dlen, delim, &cmd->u.tcp.port);
}

/* Returns 0, or length of numbers: |||6446| */
static int try_epsv_response(const char *data, size_t dlen,
			     struct nf_conntrack_man *cmd, char term)
{
	char delim;

	/* Three delimiters. */
	if (dlen <= 3) return 0;
	delim = data[0];
	if (isdigit(delim) || delim < 33 || delim > 126 ||
	    data[1] != delim || data[2] != delim)
		return 0;

	return get_port(data, 3, dlen, delim, &cmd->u.tcp.port);
}

/* Return 1 for match, 0 for accept, -1 for partial. */
static int find_pattern(const char *data, size_t dlen,
			const char *pattern, size_t plen,
			char skip, char term,
			unsigned int *numoff,
			unsigned int *numlen,
			struct nf_conntrack_man *cmd,
			int (*getnum)(const char *, size_t,
				      struct nf_conntrack_man *, char))
{
	size_t i;

	pr_debug("find_pattern `%s': dlen = %Zu\n", pattern, dlen);
	if (dlen == 0)
		return 0;

	if (dlen <= plen) {
		/* Short packet: try for partial? */
		if (strnicmp(data, pattern, dlen) == 0)
			return -1;
		else return 0;
	}

	if (strnicmp(data, pattern, plen) != 0) {
#if 0
		size_t i;

		pr_debug("ftp: string mismatch\n");
		for (i = 0; i < plen; i++) {
			pr_debug("ftp:char %u `%c'(%u) vs `%c'(%u)\n",
				 i, data[i], data[i],
				 pattern[i], pattern[i]);
		}
#endif
		return 0;
	}

	pr_debug("Pattern matches!\n");
	/* Now we've found the constant string, try to skip
	   to the 'skip' character */
	for (i = plen; data[i] != skip; i++)
		if (i == dlen - 1) return -1;

	/* Skip over the last character */
	i++;

	pr_debug("Skipped up to `%c'!\n", skip);

	*numoff = i;
	*numlen = getnum(data + i, dlen - i, cmd, term);
	if (!*numlen)
		return -1;

	pr_debug("Match succeeded!\n");
	return 1;
}

/* Look up to see if we're just after a \n. */
static int find_nl_seq(u32 seq, const struct nf_ct_ftp_master *info, int dir)
{
	unsigned int i;

	for (i = 0; i < info->seq_aft_nl_num[dir]; i++)
		if (info->seq_aft_nl[dir][i] == seq)
			return 1;
	return 0;
}

/* We don't update if it's older than what we have. */
static void update_nl_seq(struct nf_conn *ct, u32 nl_seq,
			  struct nf_ct_ftp_master *info, int dir,
			  struct sk_buff *skb)
{
	unsigned int i, oldest;

	/* Look for oldest: if we find exact match, we're done. */
	for (i = 0; i < info->seq_aft_nl_num[dir]; i++) {
		if (info->seq_aft_nl[dir][i] == nl_seq)
			return;
	}

	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 (before(info->seq_aft_nl[dir][0], info->seq_aft_nl[dir][1]))
			oldest = 0;
		else
			oldest = 1;

		if (after(nl_seq, info->seq_aft_nl[dir][oldest]))
			info->seq_aft_nl[dir][oldest] = nl_seq;
	}
}

static int help(struct sk_buff *skb,
		unsigned int protoff,
		struct nf_conn *ct,
		enum ip_conntrack_info ctinfo)
{
	unsigned int dataoff, datalen;
	const struct tcphdr *th;
	struct tcphdr _tcph;
	const char *fb_ptr;
	int ret;
	u32 seq;
	int dir = CTINFO2DIR(ctinfo);
	unsigned int uninitialized_var(matchlen), uninitialized_var(matchoff);
	struct nf_ct_ftp_master *ct_ftp_info = nfct_help_data(ct);
	struct nf_conntrack_expect *exp;
	union nf_inet_addr *daddr;
	struct nf_conntrack_man cmd = {};
	unsigned int i;
	int found = 0, ends_in_nl;
	typeof(nf_nat_ftp_hook) nf_nat_ftp;

	/* Until there's been traffic both ways, don't look in packets. */
	if (ctinfo != IP_CT_ESTABLISHED &&
	    ctinfo != IP_CT_ESTABLISHED_REPLY) {
		pr_debug("ftp: Conntrackinfo = %u\n", ctinfo);
		return NF_ACCEPT;
	}

	th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
	if (th == NULL)
		return NF_ACCEPT;

	dataoff = protoff + th->doff * 4;
	/* No data? */
	if (dataoff >= skb->len) {
		pr_debug("ftp: dataoff(%u) >= skblen(%u)\n", dataoff,
			 skb->len);
		return NF_ACCEPT;
	}
	datalen = skb->len - dataoff;

	spin_lock_bh(&nf_ftp_lock);
	fb_ptr = skb_header_pointer(skb, dataoff, datalen, ftp_buffer);
	BUG_ON(fb_ptr == NULL);

	ends_in_nl = (fb_ptr[datalen - 1] == '\n');
	seq = ntohl(th->seq) + datalen;

	/* Look up to see if we're just after a \n. */
	if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) {
		/* We're picking up this, clear flags and let it continue */
		if (unlikely(ct_ftp_info->flags[dir] & NF_CT_FTP_SEQ_PICKUP)) {
			ct_ftp_info->flags[dir] ^= NF_CT_FTP_SEQ_PICKUP;
			goto skip_nl_seq;
		}

		/* Now if this ends in \n, update ftp info. */
		pr_debug("nf_conntrack_ftp: wrong seq pos %s(%u) or %s(%u)\n",
			 ct_ftp_info->seq_aft_nl_num[dir] > 0 ? "" : "(UNSET)",
			 ct_ftp_info->seq_aft_nl[dir][0],
			 ct_ftp_info->seq_aft_nl_num[dir] > 1 ? "" : "(UNSET)",
			 ct_ftp_info->seq_aft_nl[dir][1]);
		ret = NF_ACCEPT;
		goto out_update_nl;
	}

skip_nl_seq:
	/* Initialize IP/IPv6 addr to expected address (it's not mentioned
	   in EPSV responses) */
	cmd.l3num = nf_ct_l3num(ct);
	memcpy(cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all,
	       sizeof(cmd.u3.all));

	for (i = 0; i < ARRAY_SIZE(search[dir]); i++) {
		found = find_pattern(fb_ptr, datalen,
				     search[dir][i].pattern,
				     search[dir][i].plen,
				     search[dir][i].skip,
				     search[dir][i].term,
				     &matchoff, &matchlen,
				     &cmd,
				     search[dir][i].getnum);
		if (found) break;
	}
	if (found == -1) {
		/* We don't usually drop packets.  After all, this is
		   connection tracking, not packet filtering.
		   However, it is necessary for accurate tracking in
		   this case. */
		nf_ct_helper_log(skb, ct, "partial matching of `%s'",
			         search[dir][i].pattern);
		ret = NF_DROP;
		goto out;
	} else if (found == 0) { /* No match */
		ret = NF_ACCEPT;
		goto out_update_nl;
	}

	pr_debug("conntrack_ftp: match `%.*s' (%u bytes at %u)\n",
		 matchlen, fb_ptr + matchoff,
		 matchlen, ntohl(th->seq) + matchoff);

	exp = nf_ct_expect_alloc(ct);
	if (exp == NULL) {
		nf_ct_helper_log(skb, ct, "cannot alloc expectation");
		ret = NF_DROP;
		goto out;
	}

	/* We refer to the reverse direction ("!dir") tuples here,
	 * because we're expecting something in the other direction.
	 * Doesn't matter unless NAT is happening.  */
	daddr = &ct->tuplehash[!dir].tuple.dst.u3;

	/* Update the ftp info */
	if ((cmd.l3num == nf_ct_l3num(ct)) &&
	    memcmp(&cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all,
		     sizeof(cmd.u3.all))) {
		/* Enrico Scholz's passive FTP to partially RNAT'd ftp
		   server: it really wants us to connect to a
		   different IP address.  Simply don't record it for
		   NAT. */
		if (cmd.l3num == PF_INET) {
			pr_debug("conntrack_ftp: NOT RECORDING: %pI4 != %pI4\n",
				 &cmd.u3.ip,
				 &ct->tuplehash[dir].tuple.src.u3.ip);
		} else {
			pr_debug("conntrack_ftp: NOT RECORDING: %pI6 != %pI6\n",
				 cmd.u3.ip6,
				 ct->tuplehash[dir].tuple.src.u3.ip6);
		}

		/* Thanks to Cristiano Lincoln Mattos
		   <lincoln@cesar.org.br> for reporting this potential
		   problem (DMZ machines opening holes to internal
		   networks, or the packet filter itself). */
		if (!loose) {
			ret = NF_ACCEPT;
			goto out_put_expect;
		}
		daddr = &cmd.u3;
	}

	nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, cmd.l3num,
			  &ct->tuplehash[!dir].tuple.src.u3, daddr,
			  IPPROTO_TCP, NULL, &cmd.u.tcp.port);

	/* Now, NAT might want to mangle the packet, and register the
	 * (possibly changed) expectation itself. */
	nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook);
	if (nf_nat_ftp && ct->status & IPS_NAT_MASK)
		ret = nf_nat_ftp(skb, ctinfo, search[dir][i].ftptype,
				 protoff, matchoff, matchlen, exp);
	else {
		/* Can't expect this?  Best to drop packet now. */
		if (nf_ct_expect_related(exp) != 0) {
			nf_ct_helper_log(skb, ct, "cannot add expectation");
			ret = NF_DROP;
		} else
			ret = NF_ACCEPT;
	}

out_put_expect:
	nf_ct_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(ct, seq, ct_ftp_info, dir, skb);
 out:
	spin_unlock_bh(&nf_ftp_lock);
	return ret;
}

static int nf_ct_ftp_from_nlattr(struct nlattr *attr, struct nf_conn *ct)
{
	struct nf_ct_ftp_master *ftp = nfct_help_data(ct);

	/* This conntrack has been injected from user-space, always pick up
	 * sequence tracking. Otherwise, the first FTP command after the
	 * failover breaks.
	 */
	ftp->flags[IP_CT_DIR_ORIGINAL] |= NF_CT_FTP_SEQ_PICKUP;
	ftp->flags[IP_CT_DIR_REPLY] |= NF_CT_FTP_SEQ_PICKUP;
	return 0;
}

static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly;

static const struct nf_conntrack_expect_policy ftp_exp_policy = {
	.max_expected	= 1,
	.timeout	= 5 * 60,
};

/* don't make this __exit, since it's called from __init ! */
static void nf_conntrack_ftp_fini(void)
{
	int i, j;
	for (i = 0; i < ports_c; i++) {
		for (j = 0; j < 2; j++) {
			if (ftp[i][j].me == NULL)
				continue;

			pr_debug("nf_ct_ftp: unregistering helper for pf: %d "
				 "port: %d\n",
				 ftp[i][j].tuple.src.l3num, ports[i]);
			nf_conntrack_helper_unregister(&ftp[i][j]);
		}
	}

	kfree(ftp_buffer);
}

static int __init nf_conntrack_ftp_init(void)
{
	int i, j = -1, ret = 0;

	ftp_buffer = kmalloc(65536, GFP_KERNEL);
	if (!ftp_buffer)
		return -ENOMEM;

	if (ports_c == 0)
		ports[ports_c++] = FTP_PORT;

	/* FIXME should be configurable whether IPv4 and IPv6 FTP connections
		 are tracked or not - YK */
	for (i = 0; i < ports_c; i++) {
		ftp[i][0].tuple.src.l3num = PF_INET;
		ftp[i][1].tuple.src.l3num = PF_INET6;
		for (j = 0; j < 2; j++) {
			ftp[i][j].data_len = sizeof(struct nf_ct_ftp_master);
			ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]);
			ftp[i][j].tuple.dst.protonum = IPPROTO_TCP;
			ftp[i][j].expect_policy = &ftp_exp_policy;
			ftp[i][j].me = THIS_MODULE;
			ftp[i][j].help = help;
			ftp[i][j].from_nlattr = nf_ct_ftp_from_nlattr;
			if (ports[i] == FTP_PORT)
				sprintf(ftp[i][j].name, "ftp");
			else
				sprintf(ftp[i][j].name, "ftp-%d", ports[i]);

			pr_debug("nf_ct_ftp: registering helper for pf: %d "
				 "port: %d\n",
				 ftp[i][j].tuple.src.l3num, ports[i]);
			ret = nf_conntrack_helper_register(&ftp[i][j]);
			if (ret) {
				printk(KERN_ERR "nf_ct_ftp: failed to register"
				       " helper for pf: %d port: %d\n",
					ftp[i][j].tuple.src.l3num, ports[i]);
				nf_conntrack_ftp_fini();
				return ret;
			}
		}
	}

	return 0;
}

module_init(nf_conntrack_ftp_init);
module_exit(nf_conntrack_ftp_fini);
Commit	Line	Data
9fb9cbb1 YK	1	/* FTP extension for connection tracking. */
	2
	3	/* (C) 1999-2001 Paul `Rusty' Russell
	4	* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
	5	* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org>
f229f6ce	6	* (C) 2006-2012 Patrick McHardy <kaber@trash.net>
9fb9cbb1 YK	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License version 2 as
	10	* published by the Free Software Foundation.
9fb9cbb1 YK	11	*/
9fb9cbb1 YK	12
9fb9cbb1 YK	13	#include <linux/module.h>
	14	#include <linux/moduleparam.h>
	15	#include <linux/netfilter.h>
	16	#include <linux/ip.h>
5a0e3ad6	17	#include <linux/slab.h>
9fb9cbb1 YK	18	#include <linux/ipv6.h>
9fb9cbb1 YK	19	#include <linux/ctype.h>
6a28ec8c	20	#include <linux/inet.h>
9fb9cbb1 YK	21	#include <net/checksum.h>
	22	#include <net/tcp.h>
	23
	24	#include <net/netfilter/nf_conntrack.h>
77ab9cff	25	#include <net/netfilter/nf_conntrack_expect.h>
f6180121	26	#include <net/netfilter/nf_conntrack_ecache.h>
9fb9cbb1 YK	27	#include <net/netfilter/nf_conntrack_helper.h>
	28	#include <linux/netfilter/nf_conntrack_ftp.h>
	29
	30	MODULE_LICENSE("GPL");
	31	MODULE_AUTHOR("Rusty Russell <rusty@rustcorp.com.au>");
	32	MODULE_DESCRIPTION("ftp connection tracking helper");
d2483dde	33	MODULE_ALIAS("ip_conntrack_ftp");
4dc06f96	34	MODULE_ALIAS_NFCT_HELPER("ftp");
9fb9cbb1 YK	35
	36	/* This is slow, but it's simple. --RR */
	37	static char *ftp_buffer;
	38
	39	static DEFINE_SPINLOCK(nf_ftp_lock);
	40
	41	#define MAX_PORTS 8
	42	static u_int16_t ports[MAX_PORTS];
	43	static unsigned int ports_c;
	44	module_param_array(ports, ushort, &ports_c, 0400);
	45
eb939922	46	static bool loose;
e7be6994	47	module_param(loose, bool, 0600);
9fb9cbb1	48
3db05fea	49	unsigned int (nf_nat_ftp_hook)(struct sk_buff skb,
9fb9cbb1	50	enum ip_conntrack_info ctinfo,
55a73324	51	enum nf_ct_ftp_type type,
051966c0	52	unsigned int protoff,
9fb9cbb1 YK	53	unsigned int matchoff,
9fb9cbb1 YK	54	unsigned int matchlen,
25b86e05	55	struct nf_conntrack_expect *exp);
9fb9cbb1 YK	56	EXPORT_SYMBOL_GPL(nf_nat_ftp_hook);
9fb9cbb1 YK	57
9fb9cbb1 YK	58	static int try_rfc959(const char , size_t, struct nf_conntrack_man , char);
	59	static int try_eprt(const char , size_t, struct nf_conntrack_man , char);
	60	static int try_epsv_response(const char , size_t, struct nf_conntrack_man ,
	61	char);
	62
	63	static struct ftp_search {
9fb9cbb1 YK	64	const char *pattern;
	65	size_t plen;
	66	char skip;
	67	char term;
55a73324	68	enum nf_ct_ftp_type ftptype;
9fb9cbb1	69	int (getnum)(const char , size_t, struct nf_conntrack_man *, char);
7d8c5018 PM	70	} search[IP_CT_DIR_MAX][2] = {
	71	[IP_CT_DIR_ORIGINAL] = {
	72	{
	73	.pattern = "PORT",
	74	.plen = sizeof("PORT") - 1,
	75	.skip = ' ',
	76	.term = '\r',
55a73324	77	.ftptype = NF_CT_FTP_PORT,
7d8c5018 PM	78	.getnum = try_rfc959,
	79	},
	80	{
	81	.pattern = "EPRT",
	82	.plen = sizeof("EPRT") - 1,
	83	.skip = ' ',
	84	.term = '\r',
55a73324	85	.ftptype = NF_CT_FTP_EPRT,
7d8c5018 PM	86	.getnum = try_eprt,
7d8c5018 PM	87	},
9fb9cbb1	88	},
7d8c5018 PM	89	[IP_CT_DIR_REPLY] = {
	90	{
	91	.pattern = "227 ",
	92	.plen = sizeof("227 ") - 1,
	93	.skip = '(',
	94	.term = ')',
55a73324	95	.ftptype = NF_CT_FTP_PASV,
7d8c5018 PM	96	.getnum = try_rfc959,
	97	},
	98	{
	99	.pattern = "229 ",
	100	.plen = sizeof("229 ") - 1,
	101	.skip = '(',
	102	.term = ')',
55a73324	103	.ftptype = NF_CT_FTP_EPSV,
7d8c5018 PM	104	.getnum = try_epsv_response,
7d8c5018 PM	105	},
9fb9cbb1 YK	106	},
	107	};
	108
9fb9cbb1 YK	109	static int
	110	get_ipv6_addr(const char src, size_t dlen, struct in6_addr dst, u_int8_t term)
	111	{
6a28ec8c DM	112	const char *end;
6a28ec8c DM	113	int ret = in6_pton(src, min_t(size_t, dlen, 0xffff), (u8 *)dst, term, &end);
1884f78c YH	114	if (ret > 0)
	115	return (int)(end - src);
	116	return 0;
9fb9cbb1 YK	117	}
	118
	119	static int try_number(const char *data, size_t dlen, u_int32_t array[],
601e68e1	120	int array_size, char sep, char term)
9fb9cbb1 YK	121	{
	122	u_int32_t i, len;
	123
	124	memset(array, 0, sizeof(array[0])*array_size);
	125
	126	/* Keep data pointing at next char. */
	127	for (i = 0, len = 0; len < dlen && i < array_size; len++, data++) {
	128	if (data >= '0' && data <= '9') {
	129	array[i] = array[i]10 + data - '0';
	130	}
	131	else if (*data == sep)
	132	i++;
	133	else {
	134	/* Unexpected character; true if it's the
	135	terminator and we're finished. */
	136	if (*data == term && i == array_size - 1)
	137	return len;
	138
0d53778e PM	139	pr_debug("Char %u (got %u nums) `%u' unexpected\n",
0d53778e PM	140	len, i, *data);
9fb9cbb1 YK	141	return 0;
	142	}
	143	}
0d53778e PM	144	pr_debug("Failed to fill %u numbers separated by %c\n",
0d53778e PM	145	array_size, sep);
9fb9cbb1 YK	146	return 0;
	147	}
	148
	149	/* Returns 0, or length of numbers: 192,168,1,1,5,6 */
	150	static int try_rfc959(const char *data, size_t dlen,
	151	struct nf_conntrack_man *cmd, char term)
	152	{
	153	int length;
	154	u_int32_t array[6];
	155
	156	length = try_number(data, dlen, array, 6, ',', term);
	157	if (length == 0)
	158	return 0;
	159
	160	cmd->u3.ip = htonl((array[0] << 24) \| (array[1] << 16) \|
	161	(array[2] << 8) \| array[3]);
	162	cmd->u.tcp.port = htons((array[4] << 8) \| array[5]);
	163	return length;
	164	}
	165
	166	/* Grab port: number up to delimiter */
	167	static int get_port(const char *data, int start, size_t dlen, char delim,
bff9a89b	168	__be16 *port)
9fb9cbb1 YK	169	{
	170	u_int16_t tmp_port = 0;
	171	int i;
	172
	173	for (i = start; i < dlen; i++) {
	174	/* Finished? */
	175	if (data[i] == delim) {
	176	if (tmp_port == 0)
	177	break;
	178	*port = htons(tmp_port);
0d53778e	179	pr_debug("get_port: return %d\n", tmp_port);
9fb9cbb1 YK	180	return i + 1;
	181	}
	182	else if (data[i] >= '0' && data[i] <= '9')
	183	tmp_port = tmp_port*10 + data[i] - '0';
	184	else { /* Some other crap */
0d53778e	185	pr_debug("get_port: invalid char.\n");
9fb9cbb1 YK	186	break;
	187	}
	188	}
	189	return 0;
	190	}
	191
	192	/* Returns 0, or length of numbers: \|1\|132.235.1.2\|6275\| or \|2\|3ffe::1\|6275\| */
	193	static int try_eprt(const char data, size_t dlen, struct nf_conntrack_man cmd,
	194	char term)
	195	{
	196	char delim;
	197	int length;
	198
	199	/* First character is delimiter, then "1" for IPv4 or "2" for IPv6,
	200	then delimiter again. */
	201	if (dlen <= 3) {
0d53778e	202	pr_debug("EPRT: too short\n");
9fb9cbb1 YK	203	return 0;
	204	}
	205	delim = data[0];
	206	if (isdigit(delim) \|\| delim < 33 \|\| delim > 126 \|\| data[2] != delim) {
0d53778e	207	pr_debug("try_eprt: invalid delimitter.\n");
9fb9cbb1 YK	208	return 0;
	209	}
	210
	211	if ((cmd->l3num == PF_INET && data[1] != '1') \|\|
	212	(cmd->l3num == PF_INET6 && data[1] != '2')) {
0d53778e	213	pr_debug("EPRT: invalid protocol number.\n");
9fb9cbb1 YK	214	return 0;
	215	}
	216
0d53778e	217	pr_debug("EPRT: Got %c%c%c\n", delim, data[1], delim);
9fb9cbb1 YK	218
	219	if (data[1] == '1') {
	220	u_int32_t array[4];
	221
	222	/* Now we have IP address. */
	223	length = try_number(data + 3, dlen - 3, array, 4, '.', delim);
	224	if (length != 0)
	225	cmd->u3.ip = htonl((array[0] << 24) \| (array[1] << 16)
	226	\| (array[2] << 8) \| array[3]);
	227	} else {
	228	/* Now we have IPv6 address. */
	229	length = get_ipv6_addr(data + 3, dlen - 3,
	230	(struct in6_addr *)cmd->u3.ip6, delim);
	231	}
	232
	233	if (length == 0)
	234	return 0;
0d53778e	235	pr_debug("EPRT: Got IP address!\n");
9fb9cbb1 YK	236	/* Start offset includes initial "\|1\|", and trailing delimiter */
	237	return get_port(data, 3 + length + 1, dlen, delim, &cmd->u.tcp.port);
	238	}
	239
	240	/* Returns 0, or length of numbers: \|\|\|6446\| */
	241	static int try_epsv_response(const char *data, size_t dlen,
	242	struct nf_conntrack_man *cmd, char term)
	243	{
	244	char delim;
	245
	246	/* Three delimiters. */
	247	if (dlen <= 3) return 0;
	248	delim = data[0];
f64f9e71 JP	249	if (isdigit(delim) \|\| delim < 33 \|\| delim > 126 \|\|
f64f9e71 JP	250	data[1] != delim \|\| data[2] != delim)
9fb9cbb1 YK	251	return 0;
	252
	253	return get_port(data, 3, dlen, delim, &cmd->u.tcp.port);
	254	}
	255
	256	/* Return 1 for match, 0 for accept, -1 for partial. */
	257	static int find_pattern(const char *data, size_t dlen,
	258	const char *pattern, size_t plen,
	259	char skip, char term,
	260	unsigned int *numoff,
	261	unsigned int *numlen,
	262	struct nf_conntrack_man *cmd,
	263	int (getnum)(const char , size_t,
	264	struct nf_conntrack_man *, char))
	265	{
	266	size_t i;
	267
0d53778e	268	pr_debug("find_pattern `%s': dlen = %Zu\n", pattern, dlen);
9fb9cbb1 YK	269	if (dlen == 0)
	270	return 0;
	271
	272	if (dlen <= plen) {
	273	/* Short packet: try for partial? */
	274	if (strnicmp(data, pattern, dlen) == 0)
	275	return -1;
	276	else return 0;
	277	}
	278
	279	if (strnicmp(data, pattern, plen) != 0) {
	280	#if 0
	281	size_t i;
	282
0d53778e	283	pr_debug("ftp: string mismatch\n");
9fb9cbb1	284	for (i = 0; i < plen; i++) {
0d53778e PM	285	pr_debug("ftp:char %u `%c'(%u) vs `%c'(%u)\n",
	286	i, data[i], data[i],
	287	pattern[i], pattern[i]);
9fb9cbb1 YK	288	}
	289	#endif
	290	return 0;
	291	}
	292
0d53778e	293	pr_debug("Pattern matches!\n");
9fb9cbb1 YK	294	/* Now we've found the constant string, try to skip
	295	to the 'skip' character */
	296	for (i = plen; data[i] != skip; i++)
	297	if (i == dlen - 1) return -1;
	298
	299	/* Skip over the last character */
	300	i++;
	301
0d53778e	302	pr_debug("Skipped up to `%c'!\n", skip);
9fb9cbb1 YK	303
	304	*numoff = i;
	305	*numlen = getnum(data + i, dlen - i, cmd, term);
	306	if (!*numlen)
	307	return -1;
	308
0d53778e	309	pr_debug("Match succeeded!\n");
9fb9cbb1 YK	310	return 1;
	311	}
	312
	313	/* Look up to see if we're just after a \n. */
55a73324	314	static int find_nl_seq(u32 seq, const struct nf_ct_ftp_master *info, int dir)
9fb9cbb1 YK	315	{
	316	unsigned int i;
	317
	318	for (i = 0; i < info->seq_aft_nl_num[dir]; i++)
	319	if (info->seq_aft_nl[dir][i] == seq)
	320	return 1;
	321	return 0;
	322	}
	323
	324	/* We don't update if it's older than what we have. */
a71996fc AD	325	static void update_nl_seq(struct nf_conn *ct, u32 nl_seq,
a71996fc AD	326	struct nf_ct_ftp_master *info, int dir,
9fb9cbb1 YK	327	struct sk_buff *skb)
9fb9cbb1 YK	328	{
aaff23a9	329	unsigned int i, oldest;
9fb9cbb1 YK	330
	331	/* Look for oldest: if we find exact match, we're done. */
	332	for (i = 0; i < info->seq_aft_nl_num[dir]; i++) {
	333	if (info->seq_aft_nl[dir][i] == nl_seq)
	334	return;
9fb9cbb1 YK	335	}
	336
	337	if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) {
	338	info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq;
aaff23a9 PM	339	} else {
	340	if (before(info->seq_aft_nl[dir][0], info->seq_aft_nl[dir][1]))
	341	oldest = 0;
	342	else
	343	oldest = 1;
	344
	345	if (after(nl_seq, info->seq_aft_nl[dir][oldest]))
	346	info->seq_aft_nl[dir][oldest] = nl_seq;
9fb9cbb1 YK	347	}
	348	}
	349
3db05fea	350	static int help(struct sk_buff *skb,
9fb9cbb1 YK	351	unsigned int protoff,
	352	struct nf_conn *ct,
	353	enum ip_conntrack_info ctinfo)
	354	{
	355	unsigned int dataoff, datalen;
58c0fb0d JE	356	const struct tcphdr *th;
	357	struct tcphdr _tcph;
	358	const char *fb_ptr;
9fb9cbb1 YK	359	int ret;
	360	u32 seq;
	361	int dir = CTINFO2DIR(ctinfo);
d6e8cc6c	362	unsigned int uninitialized_var(matchlen), uninitialized_var(matchoff);
1afc5679	363	struct nf_ct_ftp_master *ct_ftp_info = nfct_help_data(ct);
9fb9cbb1	364	struct nf_conntrack_expect *exp;
643a2c15	365	union nf_inet_addr *daddr;
9fb9cbb1	366	struct nf_conntrack_man cmd = {};
9fb9cbb1 YK	367	unsigned int i;
9fb9cbb1 YK	368	int found = 0, ends_in_nl;
337fbc41	369	typeof(nf_nat_ftp_hook) nf_nat_ftp;
9fb9cbb1 YK	370
9fb9cbb1 YK	371	/* Until there's been traffic both ways, don't look in packets. */
f64f9e71	372	if (ctinfo != IP_CT_ESTABLISHED &&
fb048833	373	ctinfo != IP_CT_ESTABLISHED_REPLY) {
0d53778e	374	pr_debug("ftp: Conntrackinfo = %u\n", ctinfo);
9fb9cbb1 YK	375	return NF_ACCEPT;
	376	}
	377
3db05fea	378	th = skb_header_pointer(skb, protoff, sizeof(_tcph), &_tcph);
9fb9cbb1 YK	379	if (th == NULL)
	380	return NF_ACCEPT;
	381
	382	dataoff = protoff + th->doff * 4;
	383	/* No data? */
3db05fea	384	if (dataoff >= skb->len) {
0d53778e	385	pr_debug("ftp: dataoff(%u) >= skblen(%u)\n", dataoff,
3db05fea	386	skb->len);
9fb9cbb1 YK	387	return NF_ACCEPT;
9fb9cbb1 YK	388	}
3db05fea	389	datalen = skb->len - dataoff;
9fb9cbb1 YK	390
9fb9cbb1 YK	391	spin_lock_bh(&nf_ftp_lock);
3db05fea	392	fb_ptr = skb_header_pointer(skb, dataoff, datalen, ftp_buffer);
9fb9cbb1 YK	393	BUG_ON(fb_ptr == NULL);
	394
	395	ends_in_nl = (fb_ptr[datalen - 1] == '\n');
	396	seq = ntohl(th->seq) + datalen;
	397
	398	/* Look up to see if we're just after a \n. */
	399	if (!find_nl_seq(ntohl(th->seq), ct_ftp_info, dir)) {
7be54ca4 PNA	400	/* We're picking up this, clear flags and let it continue */
	401	if (unlikely(ct_ftp_info->flags[dir] & NF_CT_FTP_SEQ_PICKUP)) {
	402	ct_ftp_info->flags[dir] ^= NF_CT_FTP_SEQ_PICKUP;
	403	goto skip_nl_seq;
	404	}
	405
9fb9cbb1	406	/* Now if this ends in \n, update ftp info. */
0d53778e PM	407	pr_debug("nf_conntrack_ftp: wrong seq pos %s(%u) or %s(%u)\n",
	408	ct_ftp_info->seq_aft_nl_num[dir] > 0 ? "" : "(UNSET)",
	409	ct_ftp_info->seq_aft_nl[dir][0],
	410	ct_ftp_info->seq_aft_nl_num[dir] > 1 ? "" : "(UNSET)",
	411	ct_ftp_info->seq_aft_nl[dir][1]);
9fb9cbb1 YK	412	ret = NF_ACCEPT;
	413	goto out_update_nl;
	414	}
	415
7be54ca4	416	skip_nl_seq:
601e68e1 YH	417	/* Initialize IP/IPv6 addr to expected address (it's not mentioned
601e68e1 YH	418	in EPSV responses) */
5e8fbe2a	419	cmd.l3num = nf_ct_l3num(ct);
9fb9cbb1 YK	420	memcpy(cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all,
	421	sizeof(cmd.u3.all));
	422
7d8c5018	423	for (i = 0; i < ARRAY_SIZE(search[dir]); i++) {
9fb9cbb1	424	found = find_pattern(fb_ptr, datalen,
7d8c5018 PM	425	search[dir][i].pattern,
	426	search[dir][i].plen,
	427	search[dir][i].skip,
	428	search[dir][i].term,
9fb9cbb1 YK	429	&matchoff, &matchlen,
9fb9cbb1 YK	430	&cmd,
7d8c5018	431	search[dir][i].getnum);
9fb9cbb1 YK	432	if (found) break;
	433	}
	434	if (found == -1) {
	435	/* We don't usually drop packets. After all, this is
	436	connection tracking, not packet filtering.
	437	However, it is necessary for accurate tracking in
	438	this case. */
b20ab9cc PNA	439	nf_ct_helper_log(skb, ct, "partial matching of `%s'",
b20ab9cc PNA	440	search[dir][i].pattern);
9fb9cbb1 YK	441	ret = NF_DROP;
	442	goto out;
	443	} else if (found == 0) { /* No match */
	444	ret = NF_ACCEPT;
	445	goto out_update_nl;
	446	}
	447
0d53778e PM	448	pr_debug("conntrack_ftp: match `%.*s' (%u bytes at %u)\n",
	449	matchlen, fb_ptr + matchoff,
	450	matchlen, ntohl(th->seq) + matchoff);
9fb9cbb1	451
6823645d	452	exp = nf_ct_expect_alloc(ct);
9fb9cbb1	453	if (exp == NULL) {
b20ab9cc	454	nf_ct_helper_log(skb, ct, "cannot alloc expectation");
9fb9cbb1 YK	455	ret = NF_DROP;
	456	goto out;
	457	}
	458
	459	/* We refer to the reverse direction ("!dir") tuples here,
	460	* because we're expecting something in the other direction.
	461	* Doesn't matter unless NAT is happening. */
df43b4e7	462	daddr = &ct->tuplehash[!dir].tuple.dst.u3;
9fb9cbb1 YK	463
9fb9cbb1 YK	464	/* Update the ftp info */
5e8fbe2a	465	if ((cmd.l3num == nf_ct_l3num(ct)) &&
9fb9cbb1 YK	466	memcmp(&cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all,
	467	sizeof(cmd.u3.all))) {
	468	/* Enrico Scholz's passive FTP to partially RNAT'd ftp
601e68e1 YH	469	server: it really wants us to connect to a
	470	different IP address. Simply don't record it for
	471	NAT. */
9fb9cbb1	472	if (cmd.l3num == PF_INET) {
14d5e834 HH	473	pr_debug("conntrack_ftp: NOT RECORDING: %pI4 != %pI4\n",
	474	&cmd.u3.ip,
	475	&ct->tuplehash[dir].tuple.src.u3.ip);
9fb9cbb1	476	} else {
5b095d98	477	pr_debug("conntrack_ftp: NOT RECORDING: %pI6 != %pI6\n",
38ff4fa4 HH	478	cmd.u3.ip6,
38ff4fa4 HH	479	ct->tuplehash[dir].tuple.src.u3.ip6);
9fb9cbb1 YK	480	}
	481
	482	/* Thanks to Cristiano Lincoln Mattos
	483	<lincoln@cesar.org.br> for reporting this potential
	484	problem (DMZ machines opening holes to internal
	485	networks, or the packet filter itself). */
	486	if (!loose) {
	487	ret = NF_ACCEPT;
	488	goto out_put_expect;
	489	}
df43b4e7	490	daddr = &cmd.u3;
9fb9cbb1 YK	491	}
9fb9cbb1 YK	492
6002f266	493	nf_ct_expect_init(exp, NF_CT_EXPECT_CLASS_DEFAULT, cmd.l3num,
df43b4e7 PM	494	&ct->tuplehash[!dir].tuple.src.u3, daddr,
df43b4e7 PM	495	IPPROTO_TCP, NULL, &cmd.u.tcp.port);
9fb9cbb1 YK	496
	497	/* Now, NAT might want to mangle the packet, and register the
	498	* (possibly changed) expectation itself. */
337fbc41	499	nf_nat_ftp = rcu_dereference(nf_nat_ftp_hook);
d33cbeeb	500	if (nf_nat_ftp && ct->status & IPS_NAT_MASK)
3db05fea	501	ret = nf_nat_ftp(skb, ctinfo, search[dir][i].ftptype,
051966c0	502	protoff, matchoff, matchlen, exp);
9fb9cbb1 YK	503	else {
9fb9cbb1 YK	504	/* Can't expect this? Best to drop packet now. */
b20ab9cc PNA	505	if (nf_ct_expect_related(exp) != 0) {
b20ab9cc PNA	506	nf_ct_helper_log(skb, ct, "cannot add expectation");
9fb9cbb1	507	ret = NF_DROP;
b20ab9cc	508	} else
9fb9cbb1 YK	509	ret = NF_ACCEPT;
	510	}
	511
	512	out_put_expect:
6823645d	513	nf_ct_expect_put(exp);
9fb9cbb1 YK	514
	515	out_update_nl:
	516	/* Now if this ends in \n, update ftp info. Seq may have been
	517	* adjusted by NAT code. */
	518	if (ends_in_nl)
a71996fc	519	update_nl_seq(ct, seq, ct_ftp_info, dir, skb);
9fb9cbb1 YK	520	out:
	521	spin_unlock_bh(&nf_ftp_lock);
	522	return ret;
	523	}
	524
7be54ca4 PNA	525	static int nf_ct_ftp_from_nlattr(struct nlattr attr, struct nf_conn ct)
	526	{
	527	struct nf_ct_ftp_master *ftp = nfct_help_data(ct);
	528
	529	/* This conntrack has been injected from user-space, always pick up
	530	* sequence tracking. Otherwise, the first FTP command after the
	531	* failover breaks.
	532	*/
	533	ftp->flags[IP_CT_DIR_ORIGINAL] \|= NF_CT_FTP_SEQ_PICKUP;
	534	ftp->flags[IP_CT_DIR_REPLY] \|= NF_CT_FTP_SEQ_PICKUP;
	535	return 0;
	536	}
	537
ec59a111	538	static struct nf_conntrack_helper ftp[MAX_PORTS][2] __read_mostly;
9fb9cbb1	539
6002f266 PM	540	static const struct nf_conntrack_expect_policy ftp_exp_policy = {
	541	.max_expected = 1,
	542	.timeout = 5 * 60,
	543	};
	544
9fb9cbb1	545	/* don't make this __exit, since it's called from __init ! */
65b4b4e8	546	static void nf_conntrack_ftp_fini(void)
9fb9cbb1 YK	547	{
	548	int i, j;
	549	for (i = 0; i < ports_c; i++) {
	550	for (j = 0; j < 2; j++) {
	551	if (ftp[i][j].me == NULL)
	552	continue;
	553
0d53778e PM	554	pr_debug("nf_ct_ftp: unregistering helper for pf: %d "
	555	"port: %d\n",
	556	ftp[i][j].tuple.src.l3num, ports[i]);
9fb9cbb1 YK	557	nf_conntrack_helper_unregister(&ftp[i][j]);
	558	}
	559	}
	560
	561	kfree(ftp_buffer);
	562	}
	563
65b4b4e8	564	static int __init nf_conntrack_ftp_init(void)
9fb9cbb1 YK	565	{
9fb9cbb1 YK	566	int i, j = -1, ret = 0;
9fb9cbb1 YK	567
	568	ftp_buffer = kmalloc(65536, GFP_KERNEL);
	569	if (!ftp_buffer)
	570	return -ENOMEM;
	571
	572	if (ports_c == 0)
	573	ports[ports_c++] = FTP_PORT;
	574
	575	/* FIXME should be configurable whether IPv4 and IPv6 FTP connections
	576	are tracked or not - YK */
	577	for (i = 0; i < ports_c; i++) {
9fb9cbb1 YK	578	ftp[i][0].tuple.src.l3num = PF_INET;
	579	ftp[i][1].tuple.src.l3num = PF_INET6;
	580	for (j = 0; j < 2; j++) {
1afc5679	581	ftp[i][j].data_len = sizeof(struct nf_ct_ftp_master);
9fb9cbb1 YK	582	ftp[i][j].tuple.src.u.tcp.port = htons(ports[i]);
9fb9cbb1 YK	583	ftp[i][j].tuple.dst.protonum = IPPROTO_TCP;
6002f266	584	ftp[i][j].expect_policy = &ftp_exp_policy;
9fb9cbb1 YK	585	ftp[i][j].me = THIS_MODULE;
9fb9cbb1 YK	586	ftp[i][j].help = help;
7be54ca4	587	ftp[i][j].from_nlattr = nf_ct_ftp_from_nlattr;
9fb9cbb1	588	if (ports[i] == FTP_PORT)
3a8fc53a	589	sprintf(ftp[i][j].name, "ftp");
9fb9cbb1	590	else
3a8fc53a	591	sprintf(ftp[i][j].name, "ftp-%d", ports[i]);
9fb9cbb1	592
0d53778e PM	593	pr_debug("nf_ct_ftp: registering helper for pf: %d "
	594	"port: %d\n",
	595	ftp[i][j].tuple.src.l3num, ports[i]);
9fb9cbb1 YK	596	ret = nf_conntrack_helper_register(&ftp[i][j]);
9fb9cbb1 YK	597	if (ret) {
654d0fbd SH	598	printk(KERN_ERR "nf_ct_ftp: failed to register"
654d0fbd SH	599	" helper for pf: %d port: %d\n",
9fb9cbb1	600	ftp[i][j].tuple.src.l3num, ports[i]);
65b4b4e8	601	nf_conntrack_ftp_fini();
9fb9cbb1 YK	602	return ret;
	603	}
	604	}
	605	}
	606
	607	return 0;
	608	}
	609
65b4b4e8 AM	610	module_init(nf_conntrack_ftp_init);
65b4b4e8 AM	611	module_exit(nf_conntrack_ftp_fini);