| /* 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> |
| * |
| * 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. |
| * |
| * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| * - enable working with Layer 3 protocol independent connection tracking. |
| * - track EPRT and EPSV commands with IPv6 address. |
| * |
| * Derived from net/ipv4/netfilter/ip_conntrack_ftp.c |
| */ |
| |
| #include <linux/config.h> |
| #include <linux/module.h> |
| #include <linux/moduleparam.h> |
| #include <linux/netfilter.h> |
| #include <linux/ip.h> |
| #include <linux/ipv6.h> |
| #include <linux/ctype.h> |
| #include <net/checksum.h> |
| #include <net/tcp.h> |
| |
| #include <net/netfilter/nf_conntrack.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"); |
| |
| /* 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 int loose; |
| module_param(loose, int, 0600); |
| |
| unsigned int (*nf_nat_ftp_hook)(struct sk_buff **pskb, |
| enum ip_conntrack_info ctinfo, |
| enum ip_ct_ftp_type type, |
| unsigned int matchoff, |
| unsigned int matchlen, |
| struct nf_conntrack_expect *exp, |
| u32 *seq); |
| EXPORT_SYMBOL_GPL(nf_nat_ftp_hook); |
| |
| #if 0 |
| #define DEBUGP printk |
| #else |
| #define DEBUGP(format, args...) |
| #endif |
| |
| 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 { |
| enum ip_conntrack_dir dir; |
| const char *pattern; |
| size_t plen; |
| char skip; |
| char term; |
| enum ip_ct_ftp_type ftptype; |
| int (*getnum)(const char *, size_t, struct nf_conntrack_man *, 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, |
| }, |
| { |
| IP_CT_DIR_REPLY, |
| "229 ", sizeof("229 ") - 1, '(', ')', |
| IP_CT_FTP_EPSV, |
| try_epsv_response, |
| }, |
| }; |
| |
| /* This code is based on inet_pton() in glibc-2.2.4 */ |
| static int |
| get_ipv6_addr(const char *src, size_t dlen, struct in6_addr *dst, u_int8_t term) |
| { |
| static const char xdigits[] = "0123456789abcdef"; |
| u_int8_t tmp[16], *tp, *endp, *colonp; |
| int ch, saw_xdigit; |
| u_int32_t val; |
| size_t clen = 0; |
| |
| tp = memset(tmp, '\0', sizeof(tmp)); |
| endp = tp + sizeof(tmp); |
| colonp = NULL; |
| |
| /* Leading :: requires some special handling. */ |
| if (*src == ':'){ |
| if (*++src != ':') { |
| DEBUGP("invalid \":\" at the head of addr\n"); |
| return 0; |
| } |
| clen++; |
| } |
| |
| saw_xdigit = 0; |
| val = 0; |
| while ((clen < dlen) && (*src != term)) { |
| const char *pch; |
| |
| ch = tolower(*src++); |
| clen++; |
| |
| pch = strchr(xdigits, ch); |
| if (pch != NULL) { |
| val <<= 4; |
| val |= (pch - xdigits); |
| if (val > 0xffff) |
| return 0; |
| |
| saw_xdigit = 1; |
| continue; |
| } |
| if (ch != ':') { |
| DEBUGP("get_ipv6_addr: invalid char. \'%c\'\n", ch); |
| return 0; |
| } |
| |
| if (!saw_xdigit) { |
| if (colonp) { |
| DEBUGP("invalid location of \"::\".\n"); |
| return 0; |
| } |
| colonp = tp; |
| continue; |
| } else if (*src == term) { |
| DEBUGP("trancated IPv6 addr\n"); |
| return 0; |
| } |
| |
| if (tp + 2 > endp) |
| return 0; |
| *tp++ = (u_int8_t) (val >> 8) & 0xff; |
| *tp++ = (u_int8_t) val & 0xff; |
| |
| saw_xdigit = 0; |
| val = 0; |
| continue; |
| } |
| if (saw_xdigit) { |
| if (tp + 2 > endp) |
| return 0; |
| *tp++ = (u_int8_t) (val >> 8) & 0xff; |
| *tp++ = (u_int8_t) val & 0xff; |
| } |
| if (colonp != NULL) { |
| /* |
| * Since some memmove()'s erroneously fail to handle |
| * overlapping regions, we'll do the shift by hand. |
| */ |
| const int n = tp - colonp; |
| int i; |
| |
| if (tp == endp) |
| return 0; |
| |
| for (i = 1; i <= n; i++) { |
| endp[- i] = colonp[n - i]; |
| colonp[n - i] = 0; |
| } |
| tp = endp; |
| } |
| if (tp != endp || (*src != term)) |
| return 0; |
| |
| memcpy(dst->s6_addr, tmp, sizeof(dst->s6_addr)); |
| return clen; |
| } |
| |
| 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; |
| |
| DEBUGP("Char %u (got %u nums) `%u' unexpected\n", |
| len, i, *data); |
| return 0; |
| } |
| } |
| DEBUGP("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, |
| u_int16_t *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); |
| DEBUGP("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 */ |
| DEBUGP("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) { |
| DEBUGP("EPRT: too short\n"); |
| return 0; |
| } |
| delim = data[0]; |
| if (isdigit(delim) || delim < 33 || delim > 126 || data[2] != delim) { |
| DEBUGP("try_eprt: invalid delimitter.\n"); |
| return 0; |
| } |
| |
| if ((cmd->l3num == PF_INET && data[1] != '1') || |
| (cmd->l3num == PF_INET6 && data[1] != '2')) { |
| DEBUGP("EPRT: invalid protocol number.\n"); |
| return 0; |
| } |
| |
| DEBUGP("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; |
| DEBUGP("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; |
| |
| DEBUGP("find_pattern `%s': dlen = %u\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; |
| |
| DEBUGP("ftp: string mismatch\n"); |
| for (i = 0; i < plen; i++) { |
| DEBUGP("ftp:char %u `%c'(%u) vs `%c'(%u)\n", |
| i, data[i], data[i], |
| pattern[i], pattern[i]); |
| } |
| #endif |
| return 0; |
| } |
| |
| DEBUGP("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++; |
| |
| DEBUGP("Skipped up to `%c'!\n", skip); |
| |
| *numoff = i; |
| *numlen = getnum(data + i, dlen - i, cmd, term); |
| if (!*numlen) |
| return -1; |
| |
| DEBUGP("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 ip_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(u32 nl_seq, struct ip_ct_ftp_master *info, int dir, |
| struct sk_buff *skb) |
| { |
| unsigned int i, oldest = NUM_SEQ_TO_REMEMBER; |
| |
| /* 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 (oldest == info->seq_aft_nl_num[dir] |
| || before(info->seq_aft_nl[dir][i], oldest)) |
| oldest = i; |
| } |
| |
| if (info->seq_aft_nl_num[dir] < NUM_SEQ_TO_REMEMBER) { |
| info->seq_aft_nl[dir][info->seq_aft_nl_num[dir]++] = nl_seq; |
| nf_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb); |
| } else if (oldest != NUM_SEQ_TO_REMEMBER) { |
| info->seq_aft_nl[dir][oldest] = nl_seq; |
| nf_conntrack_event_cache(IPCT_HELPINFO_VOLATILE, skb); |
| } |
| } |
| |
| static int help(struct sk_buff **pskb, |
| unsigned int protoff, |
| struct nf_conn *ct, |
| enum ip_conntrack_info ctinfo) |
| { |
| unsigned int dataoff, datalen; |
| struct tcphdr _tcph, *th; |
| char *fb_ptr; |
| int ret; |
| u32 seq; |
| int dir = CTINFO2DIR(ctinfo); |
| unsigned int matchlen, matchoff; |
| struct ip_ct_ftp_master *ct_ftp_info = &ct->help->ct_ftp_info; |
| struct nf_conntrack_expect *exp; |
| struct nf_conntrack_man cmd = {}; |
| |
| unsigned int i; |
| int found = 0, ends_in_nl; |
| |
| /* Until there's been traffic both ways, don't look in packets. */ |
| if (ctinfo != IP_CT_ESTABLISHED |
| && ctinfo != IP_CT_ESTABLISHED+IP_CT_IS_REPLY) { |
| DEBUGP("ftp: Conntrackinfo = %u\n", ctinfo); |
| return NF_ACCEPT; |
| } |
| |
| th = skb_header_pointer(*pskb, protoff, sizeof(_tcph), &_tcph); |
| if (th == NULL) |
| return NF_ACCEPT; |
| |
| dataoff = protoff + th->doff * 4; |
| /* No data? */ |
| if (dataoff >= (*pskb)->len) { |
| DEBUGP("ftp: dataoff(%u) >= skblen(%u)\n", dataoff, |
| (*pskb)->len); |
| return NF_ACCEPT; |
| } |
| datalen = (*pskb)->len - dataoff; |
| |
| spin_lock_bh(&nf_ftp_lock); |
| fb_ptr = skb_header_pointer(*pskb, 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)) { |
| /* Now if this ends in \n, update ftp info. */ |
| DEBUGP("nf_conntrack_ftp_help: 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; |
| } |
| |
| /* Initialize IP/IPv6 addr to expected address (it's not mentioned |
| in EPSV responses) */ |
| cmd.l3num = ct->tuplehash[dir].tuple.src.l3num; |
| memcpy(cmd.u3.all, &ct->tuplehash[dir].tuple.src.u3.all, |
| sizeof(cmd.u3.all)); |
| |
| for (i = 0; i < ARRAY_SIZE(search); i++) { |
| if (search[i].dir != dir) continue; |
| |
| found = find_pattern(fb_ptr, datalen, |
| search[i].pattern, |
| search[i].plen, |
| search[i].skip, |
| search[i].term, |
| &matchoff, &matchlen, |
| &cmd, |
| search[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. */ |
| if (net_ratelimit()) |
| printk("conntrack_ftp: partial %s %u+%u\n", |
| search[i].pattern, |
| ntohl(th->seq), datalen); |
| ret = NF_DROP; |
| goto out; |
| } else if (found == 0) { /* No match */ |
| ret = NF_ACCEPT; |
| goto out_update_nl; |
| } |
| |
| DEBUGP("conntrack_ftp: match `%.*s' (%u bytes at %u)\n", |
| (int)matchlen, fb_ptr + matchoff, |
| matchlen, ntohl(th->seq) + matchoff); |
| |
| exp = nf_conntrack_expect_alloc(ct); |
| if (exp == NULL) { |
| 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. */ |
| exp->tuple.dst.u3 = ct->tuplehash[!dir].tuple.dst.u3; |
| |
| /* Update the ftp info */ |
| if ((cmd.l3num == ct->tuplehash[dir].tuple.src.l3num) && |
| 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) { |
| DEBUGP("conntrack_ftp: NOT RECORDING: %u,%u,%u,%u != %u.%u.%u.%u\n", |
| NIPQUAD(cmd.u3.ip), |
| NIPQUAD(ct->tuplehash[dir].tuple.src.u3.ip)); |
| } else { |
| DEBUGP("conntrack_ftp: NOT RECORDING: %x:%x:%x:%x:%x:%x:%x:%x != %x:%x:%x:%x:%x:%x:%x:%x\n", |
| NIP6(*((struct in6_addr *)cmd.u3.ip6)), |
| NIP6(*((struct in6_addr *)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; |
| } |
| memcpy(&exp->tuple.dst.u3, &cmd.u3.all, |
| sizeof(exp->tuple.dst.u3)); |
| } |
| |
| exp->tuple.src.u3 = ct->tuplehash[!dir].tuple.src.u3; |
| exp->tuple.src.l3num = cmd.l3num; |
| exp->tuple.src.u.tcp.port = 0; |
| exp->tuple.dst.u.tcp.port = cmd.u.tcp.port; |
| exp->tuple.dst.protonum = IPPROTO_TCP; |
| |
| exp->mask = (struct nf_conntrack_tuple) |
| { .src = { .l3num = 0xFFFF, |
| .u = { .tcp = { 0 }}, |
| }, |
| .dst = { .protonum = 0xFF, |
| .u = { .tcp = { 0xFFFF }}, |
| }, |
| }; |
| if (cmd.l3num == PF_INET) { |
| exp->mask.src.u3.ip = 0xFFFFFFFF; |
| exp->mask.dst.u3.ip = 0xFFFFFFFF; |
| } else { |
| memset(exp->mask.src.u3.ip6, 0xFF, |
| sizeof(exp->mask.src.u3.ip6)); |
| memset(exp->mask.dst.u3.ip6, 0xFF, |
| sizeof(exp->mask.src.u3.ip6)); |
| } |
| |
| exp->expectfn = NULL; |
| exp->flags = 0; |
| |
| /* Now, NAT might want to mangle the packet, and register the |
| * (possibly changed) expectation itself. */ |
| if (nf_nat_ftp_hook) |
| ret = nf_nat_ftp_hook(pskb, ctinfo, search[i].ftptype, |
| matchoff, matchlen, exp, &seq); |
| else { |
| /* Can't expect this? Best to drop packet now. */ |
| if (nf_conntrack_expect_related(exp) != 0) |
| ret = NF_DROP; |
| else |
| ret = NF_ACCEPT; |
| } |
| |
| out_put_expect: |
| nf_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, *pskb); |
| out: |
| spin_unlock_bh(&nf_ftp_lock); |
| return ret; |
| } |
| |
| static struct nf_conntrack_helper ftp[MAX_PORTS][2]; |
| static char ftp_names[MAX_PORTS][2][sizeof("ftp-65535")]; |
| |
| /* don't make this __exit, since it's called from __init ! */ |
| static void 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; |
| |
| DEBUGP("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 init(void) |
| { |
| int i, j = -1, ret = 0; |
| char *tmpname; |
| |
| 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++) { |
| memset(&ftp[i], 0, sizeof(struct nf_conntrack_helper)); |
| |
| 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].tuple.src.u.tcp.port = htons(ports[i]); |
| ftp[i][j].tuple.dst.protonum = IPPROTO_TCP; |
| ftp[i][j].mask.src.u.tcp.port = 0xFFFF; |
| ftp[i][j].mask.dst.protonum = 0xFF; |
| ftp[i][j].max_expected = 1; |
| ftp[i][j].timeout = 5 * 60; /* 5 Minutes */ |
| ftp[i][j].me = THIS_MODULE; |
| ftp[i][j].help = help; |
| tmpname = &ftp_names[i][j][0]; |
| if (ports[i] == FTP_PORT) |
| sprintf(tmpname, "ftp"); |
| else |
| sprintf(tmpname, "ftp-%d", ports[i]); |
| ftp[i][j].name = tmpname; |
| |
| DEBUGP("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("nf_ct_ftp: failed to register helper " |
| " for pf: %d port: %d\n", |
| ftp[i][j].tuple.src.l3num, ports[i]); |
| fini(); |
| return ret; |
| } |
| } |
| } |
| |
| return 0; |
| } |
| |
| module_init(init); |
| module_exit(fini); |