This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / netfilter / nf_conntrack_tftp.c

diff --git a/net/netfilter/nf_conntrack_tftp.c b/net/netfilter/nf_conntrack_tftp.c
new file mode 100644 (file)
index 0000000..f5bffe2
--- /dev/null
+++ b/net/netfilter/nf_conntrack_tftp.c
@@ -0,0 +1,160 @@
+/* (C) 2001-2002 Magnus Boden <mb@ozaba.mine.nu>
+ *
+ * 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/in.h>
+#include <linux/udp.h>
+#include <linux/netfilter.h>
+
+#include <net/netfilter/nf_conntrack.h>
+#include <net/netfilter/nf_conntrack_tuple.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_tftp.h>
+
+MODULE_AUTHOR("Magnus Boden <mb@ozaba.mine.nu>");
+MODULE_DESCRIPTION("TFTP connection tracking helper");
+MODULE_LICENSE("GPL");
+MODULE_ALIAS("ip_conntrack_tftp");
+
+#define MAX_PORTS 8
+static unsigned short ports[MAX_PORTS];
+static int ports_c;
+module_param_array(ports, ushort, &ports_c, 0400);
+MODULE_PARM_DESC(ports, "Port numbers of TFTP servers");
+
+#if 0
+#define DEBUGP(format, args...) printk("%s:%s:" format, \
+                                       __FILE__, __FUNCTION__ , ## args)
+#else
+#define DEBUGP(format, args...)
+#endif
+
+unsigned int (*nf_nat_tftp_hook)(struct sk_buff **pskb,
+                                enum ip_conntrack_info ctinfo,
+                                struct nf_conntrack_expect *exp) __read_mostly;
+EXPORT_SYMBOL_GPL(nf_nat_tftp_hook);
+
+static int tftp_help(struct sk_buff **pskb,
+                    unsigned int protoff,
+                    struct nf_conn *ct,
+                    enum ip_conntrack_info ctinfo)
+{
+       struct tftphdr _tftph, *tfh;
+       struct nf_conntrack_expect *exp;
+       struct nf_conntrack_tuple *tuple;
+       unsigned int ret = NF_ACCEPT;
+       int family = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num;
+       typeof(nf_nat_tftp_hook) nf_nat_tftp;
+
+       tfh = skb_header_pointer(*pskb, protoff + sizeof(struct udphdr),
+                                sizeof(_tftph), &_tftph);
+       if (tfh == NULL)
+               return NF_ACCEPT;
+
+       switch (ntohs(tfh->opcode)) {
+       case TFTP_OPCODE_READ:
+       case TFTP_OPCODE_WRITE:
+               /* RRQ and WRQ works the same way */
+               DEBUGP("");
+               NF_CT_DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
+               NF_CT_DUMP_TUPLE(&ct->tuplehash[IP_CT_DIR_REPLY].tuple);
+
+               exp = nf_conntrack_expect_alloc(ct);
+               if (exp == NULL)
+                       return NF_DROP;
+               tuple = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
+               nf_conntrack_expect_init(exp, family,
+                                        &tuple->src.u3, &tuple->dst.u3,
+                                        IPPROTO_UDP,
+                                        NULL, &tuple->dst.u.udp.port);
+
+               DEBUGP("expect: ");
+               NF_CT_DUMP_TUPLE(&exp->tuple);
+               NF_CT_DUMP_TUPLE(&exp->mask);
+
+               nf_nat_tftp = rcu_dereference(nf_nat_tftp_hook);
+               if (nf_nat_tftp && ct->status & IPS_NAT_MASK)
+                       ret = nf_nat_tftp(pskb, ctinfo, exp);
+               else if (nf_conntrack_expect_related(exp) != 0)
+                       ret = NF_DROP;
+               nf_conntrack_expect_put(exp);
+               break;
+       case TFTP_OPCODE_DATA:
+       case TFTP_OPCODE_ACK:
+               DEBUGP("Data/ACK opcode\n");
+               break;
+       case TFTP_OPCODE_ERROR:
+               DEBUGP("Error opcode\n");
+               break;
+       default:
+               DEBUGP("Unknown opcode\n");
+       }
+       return ret;
+}
+
+static struct nf_conntrack_helper tftp[MAX_PORTS][2] __read_mostly;
+static char tftp_names[MAX_PORTS][2][sizeof("tftp-65535")] __read_mostly;
+
+static void nf_conntrack_tftp_fini(void)
+{
+       int i, j;
+
+       for (i = 0; i < ports_c; i++) {
+               for (j = 0; j < 2; j++)
+                       nf_conntrack_helper_unregister(&tftp[i][j]);
+       }
+}
+
+static int __init nf_conntrack_tftp_init(void)
+{
+       int i, j, ret;
+       char *tmpname;
+
+       if (ports_c == 0)
+               ports[ports_c++] = TFTP_PORT;
+
+       for (i = 0; i < ports_c; i++) {
+               memset(&tftp[i], 0, sizeof(tftp[i]));
+
+               tftp[i][0].tuple.src.l3num = AF_INET;
+               tftp[i][1].tuple.src.l3num = AF_INET6;
+               for (j = 0; j < 2; j++) {
+                       tftp[i][j].tuple.dst.protonum = IPPROTO_UDP;
+                       tftp[i][j].tuple.src.u.udp.port = htons(ports[i]);
+                       tftp[i][j].mask.src.l3num = 0xFFFF;
+                       tftp[i][j].mask.dst.protonum = 0xFF;
+                       tftp[i][j].mask.src.u.udp.port = htons(0xFFFF);
+                       tftp[i][j].max_expected = 1;
+                       tftp[i][j].timeout = 5 * 60; /* 5 minutes */
+                       tftp[i][j].me = THIS_MODULE;
+                       tftp[i][j].help = tftp_help;
+
+                       tmpname = &tftp_names[i][j][0];
+                       if (ports[i] == TFTP_PORT)
+                               sprintf(tmpname, "tftp");
+                       else
+                               sprintf(tmpname, "tftp-%u", i);
+                       tftp[i][j].name = tmpname;
+
+                       ret = nf_conntrack_helper_register(&tftp[i][j]);
+                       if (ret) {
+                               printk("nf_ct_tftp: failed to register helper "
+                                      "for pf: %u port: %u\n",
+                                       tftp[i][j].tuple.src.l3num, ports[i]);
+                               nf_conntrack_tftp_fini();
+                               return ret;
+                       }
+               }
+       }
+       return 0;
+}
+
+module_init(nf_conntrack_tftp_init);
+module_exit(nf_conntrack_tftp_fini);