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![Andrew Morton](/assets/img/avatar_default.png)
Every netfilter module uses `init' for its module_init() function and `fini' or `cleanup' for its module_exit() function. Problem is, this creates uninformative initcall_debug output and makes ctags rather useless. So go through and rename them all to $(filename)_init and $(filename)_fini. Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: David S. Miller <davem@davemloft.net>
159 lines
4 KiB
C
159 lines
4 KiB
C
/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Version: 0.0.7
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*
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* Thu 21 Mar 2002 Harald Welte <laforge@gnumonks.org>
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* - port to newnat API
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*
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*/
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#include <linux/module.h>
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#include <linux/ip.h>
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#include <linux/udp.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv4/ip_conntrack_helper.h>
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#include <linux/netfilter_ipv4/ip_conntrack_tftp.h>
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#include <linux/moduleparam.h>
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MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
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MODULE_DESCRIPTION("tftp connection tracking helper");
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MODULE_LICENSE("GPL");
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#define MAX_PORTS 8
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static unsigned short ports[MAX_PORTS];
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static int ports_c;
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module_param_array(ports, ushort, &ports_c, 0400);
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MODULE_PARM_DESC(ports, "port numbers of tftp servers");
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#if 0
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#define DEBUGP(format, args...) printk("%s:%s:" format, \
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__FILE__, __FUNCTION__ , ## args)
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#else
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#define DEBUGP(format, args...)
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#endif
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unsigned int (*ip_nat_tftp_hook)(struct sk_buff **pskb,
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enum ip_conntrack_info ctinfo,
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struct ip_conntrack_expect *exp);
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EXPORT_SYMBOL_GPL(ip_nat_tftp_hook);
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static int tftp_help(struct sk_buff **pskb,
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struct ip_conntrack *ct,
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enum ip_conntrack_info ctinfo)
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{
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struct tftphdr _tftph, *tfh;
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struct ip_conntrack_expect *exp;
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unsigned int ret = NF_ACCEPT;
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tfh = skb_header_pointer(*pskb,
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(*pskb)->nh.iph->ihl*4+sizeof(struct udphdr),
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sizeof(_tftph), &_tftph);
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if (tfh == NULL)
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return NF_ACCEPT;
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switch (ntohs(tfh->opcode)) {
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/* RRQ and WRQ works the same way */
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case TFTP_OPCODE_READ:
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case TFTP_OPCODE_WRITE:
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DEBUGP("");
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DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
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DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
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exp = ip_conntrack_expect_alloc(ct);
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if (exp == NULL)
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return NF_DROP;
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exp->tuple = ct->tuplehash[IP_CT_DIR_REPLY].tuple;
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exp->mask.src.ip = 0xffffffff;
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exp->mask.src.u.udp.port = 0;
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exp->mask.dst.ip = 0xffffffff;
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exp->mask.dst.u.udp.port = 0xffff;
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exp->mask.dst.protonum = 0xff;
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exp->expectfn = NULL;
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exp->flags = 0;
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DEBUGP("expect: ");
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DUMP_TUPLE(&exp->tuple);
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DUMP_TUPLE(&exp->mask);
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if (ip_nat_tftp_hook)
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ret = ip_nat_tftp_hook(pskb, ctinfo, exp);
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else if (ip_conntrack_expect_related(exp) != 0)
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ret = NF_DROP;
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ip_conntrack_expect_put(exp);
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break;
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case TFTP_OPCODE_DATA:
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case TFTP_OPCODE_ACK:
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DEBUGP("Data/ACK opcode\n");
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break;
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case TFTP_OPCODE_ERROR:
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DEBUGP("Error opcode\n");
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break;
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default:
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DEBUGP("Unknown opcode\n");
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}
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return NF_ACCEPT;
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}
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static struct ip_conntrack_helper tftp[MAX_PORTS];
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static char tftp_names[MAX_PORTS][sizeof("tftp-65535")];
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static void ip_conntrack_tftp_fini(void)
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{
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int i;
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for (i = 0 ; i < ports_c; i++) {
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DEBUGP("unregistering helper for port %d\n",
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ports[i]);
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ip_conntrack_helper_unregister(&tftp[i]);
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}
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}
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static int __init ip_conntrack_tftp_init(void)
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{
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int i, ret;
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char *tmpname;
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if (ports_c == 0)
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ports[ports_c++] = TFTP_PORT;
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for (i = 0; i < ports_c; i++) {
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/* Create helper structure */
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memset(&tftp[i], 0, sizeof(struct ip_conntrack_helper));
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tftp[i].tuple.dst.protonum = IPPROTO_UDP;
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tftp[i].tuple.src.u.udp.port = htons(ports[i]);
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tftp[i].mask.dst.protonum = 0xFF;
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tftp[i].mask.src.u.udp.port = 0xFFFF;
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tftp[i].max_expected = 1;
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tftp[i].timeout = 5 * 60; /* 5 minutes */
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tftp[i].me = THIS_MODULE;
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tftp[i].help = tftp_help;
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tmpname = &tftp_names[i][0];
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if (ports[i] == TFTP_PORT)
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sprintf(tmpname, "tftp");
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else
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sprintf(tmpname, "tftp-%d", i);
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tftp[i].name = tmpname;
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DEBUGP("port #%d: %d\n", i, ports[i]);
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ret=ip_conntrack_helper_register(&tftp[i]);
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if (ret) {
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printk("ERROR registering helper for port %d\n",
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ports[i]);
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ip_conntrack_tftp_fini();
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return(ret);
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}
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}
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return(0);
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}
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module_init(ip_conntrack_tftp_init);
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module_exit(ip_conntrack_tftp_fini);
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