* 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.
- *
- * Derived from net/ipv4/netfilter/ip_conntrack_proto_udp.c
*/
#include <linux/types.h>
-#include <linux/sched.h>
#include <linux/timer.h>
#include <linux/module.h>
-#include <linux/netfilter.h>
#include <linux/udp.h>
#include <linux/seq_file.h>
#include <linux/skbuff.h>
#include <linux/ipv6.h>
#include <net/ip6_checksum.h>
#include <net/checksum.h>
+
#include <linux/netfilter.h>
#include <linux/netfilter_ipv4.h>
#include <linux/netfilter_ipv6.h>
-#include <net/netfilter/nf_conntrack_protocol.h>
+#include <net/netfilter/nf_conntrack_l4proto.h>
+#include <net/netfilter/nf_conntrack_ecache.h>
+#include <net/netfilter/nf_log.h>
+#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
+#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
-unsigned int nf_ct_udp_timeout = 30*HZ;
-unsigned int nf_ct_udp_timeout_stream = 180*HZ;
+static unsigned int nf_ct_udp_timeout __read_mostly = 30*HZ;
+static unsigned int nf_ct_udp_timeout_stream __read_mostly = 180*HZ;
-static int udp_pkt_to_tuple(const struct sk_buff *skb,
+static bool udp_pkt_to_tuple(const struct sk_buff *skb,
unsigned int dataoff,
struct nf_conntrack_tuple *tuple)
{
- struct udphdr _hdr, *hp;
+ const struct udphdr *hp;
+ struct udphdr _hdr;
/* Actually only need first 8 bytes. */
hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
if (hp == NULL)
- return 0;
+ return false;
tuple->src.u.udp.port = hp->source;
tuple->dst.u.udp.port = hp->dest;
- return 1;
+ return true;
}
-static int udp_invert_tuple(struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_tuple *orig)
+static bool udp_invert_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig)
{
tuple->src.u.udp.port = orig->dst.u.udp.port;
tuple->dst.u.udp.port = orig->src.u.udp.port;
- return 1;
+ return true;
}
/* Print out the per-protocol part of the tuple. */
ntohs(tuple->dst.u.udp.port));
}
-/* Print out the private part of the conntrack. */
-static int udp_print_conntrack(struct seq_file *s,
- const struct nf_conn *conntrack)
-{
- return 0;
-}
-
/* Returns verdict for packet, and may modify conntracktype */
-static int udp_packet(struct nf_conn *conntrack,
+static int udp_packet(struct nf_conn *ct,
const struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
- int pf,
+ u_int8_t pf,
unsigned int hooknum)
{
/* If we've seen traffic both ways, this is some kind of UDP
stream. Extend timeout. */
- if (test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
- nf_ct_refresh_acct(conntrack, ctinfo, skb,
- nf_ct_udp_timeout_stream);
+ if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
+ nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_udp_timeout_stream);
/* Also, more likely to be important, and not a probe */
- if (!test_and_set_bit(IPS_ASSURED_BIT, &conntrack->status))
- nf_conntrack_event_cache(IPCT_STATUS, skb);
+ if (!test_and_set_bit(IPS_ASSURED_BIT, &ct->status))
+ nf_conntrack_event_cache(IPCT_STATUS, ct);
} else
- nf_ct_refresh_acct(conntrack, ctinfo, skb, nf_ct_udp_timeout);
+ nf_ct_refresh_acct(ct, ctinfo, skb, nf_ct_udp_timeout);
return NF_ACCEPT;
}
/* Called when a new connection for this protocol found. */
-static int udp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
- unsigned int dataoff)
+static bool udp_new(struct nf_conn *ct, const struct sk_buff *skb,
+ unsigned int dataoff)
{
- return 1;
+ return true;
}
-static int udp_error(struct sk_buff *skb, unsigned int dataoff,
+static int udp_error(struct net *net, struct sk_buff *skb, unsigned int dataoff,
enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum,
- int (*csum)(const struct sk_buff *, unsigned int))
+ u_int8_t pf,
+ unsigned int hooknum)
{
unsigned int udplen = skb->len - dataoff;
- struct udphdr _hdr, *hdr;
+ const struct udphdr *hdr;
+ struct udphdr _hdr;
/* Header is too small? */
hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
if (hdr == NULL) {
- if (LOG_INVALID(IPPROTO_UDP))
+ if (LOG_INVALID(net, IPPROTO_UDP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_udp: short packet ");
return -NF_ACCEPT;
/* Truncated/malformed packets */
if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
- if (LOG_INVALID(IPPROTO_UDP))
+ if (LOG_INVALID(net, IPPROTO_UDP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_udp: truncated/malformed packet ");
return -NF_ACCEPT;
/* Checksum invalid? Ignore.
* We skip checking packets on the outgoing path
- * because the semantic of CHECKSUM_HW is different there
- * and moreover root might send raw packets.
+ * because the checksum is assumed to be correct.
* FIXME: Source route IP option packets --RR */
- if (((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
- (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING))
- && skb->ip_summed != CHECKSUM_UNNECESSARY
- && csum(skb, dataoff)) {
- if (LOG_INVALID(IPPROTO_UDP))
+ if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
+ nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
+ if (LOG_INVALID(net, IPPROTO_UDP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_udp: bad UDP checksum ");
return -NF_ACCEPT;
return NF_ACCEPT;
}
-static int csum4(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_tcpudp_magic(skb->nh.iph->saddr, skb->nh.iph->daddr,
- skb->len - dataoff, IPPROTO_UDP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
- : skb_checksum(skb, dataoff,
- skb->len - dataoff, 0));
-}
-
-static int csum6(const struct sk_buff *skb, unsigned int dataoff)
-{
- return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
- skb->len - dataoff, IPPROTO_UDP,
- skb->ip_summed == CHECKSUM_HW
- ? csum_sub(skb->csum,
- skb_checksum(skb, 0, dataoff, 0))
- : skb_checksum(skb, dataoff, skb->len - dataoff,
- 0));
-}
-
-static int udp_error4(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return udp_error(skb, dataoff, ctinfo, pf, hooknum, csum4);
-}
-
-static int udp_error6(struct sk_buff *skb,
- unsigned int dataoff,
- enum ip_conntrack_info *ctinfo,
- int pf,
- unsigned int hooknum)
-{
- return udp_error(skb, dataoff, ctinfo, pf, hooknum, csum6);
-}
+#ifdef CONFIG_SYSCTL
+static unsigned int udp_sysctl_table_users;
+static struct ctl_table_header *udp_sysctl_header;
+static struct ctl_table udp_sysctl_table[] = {
+ {
+ .procname = "nf_conntrack_udp_timeout",
+ .data = &nf_ct_udp_timeout,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "nf_conntrack_udp_timeout_stream",
+ .data = &nf_ct_udp_timeout_stream,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+static struct ctl_table udp_compat_sysctl_table[] = {
+ {
+ .procname = "ip_conntrack_udp_timeout",
+ .data = &nf_ct_udp_timeout,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "ip_conntrack_udp_timeout_stream",
+ .data = &nf_ct_udp_timeout_stream,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ { }
+};
+#endif /* CONFIG_NF_CONNTRACK_PROC_COMPAT */
+#endif /* CONFIG_SYSCTL */
-struct nf_conntrack_protocol nf_conntrack_protocol_udp4 =
+struct nf_conntrack_l4proto nf_conntrack_l4proto_udp4 __read_mostly =
{
.l3proto = PF_INET,
- .proto = IPPROTO_UDP,
+ .l4proto = IPPROTO_UDP,
.name = "udp",
.pkt_to_tuple = udp_pkt_to_tuple,
.invert_tuple = udp_invert_tuple,
.print_tuple = udp_print_tuple,
- .print_conntrack = udp_print_conntrack,
.packet = udp_packet,
.new = udp_new,
- .error = udp_error4,
-#if defined(CONFIG_NF_CT_NETLINK) || \
- defined(CONFIG_NF_CT_NETLINK_MODULE)
- .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
+ .error = udp_error,
+#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
+ .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
+ .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
+ .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
+ .nla_policy = nf_ct_port_nla_policy,
+#endif
+#ifdef CONFIG_SYSCTL
+ .ctl_table_users = &udp_sysctl_table_users,
+ .ctl_table_header = &udp_sysctl_header,
+ .ctl_table = udp_sysctl_table,
+#ifdef CONFIG_NF_CONNTRACK_PROC_COMPAT
+ .ctl_compat_table = udp_compat_sysctl_table,
+#endif
#endif
};
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp4);
-struct nf_conntrack_protocol nf_conntrack_protocol_udp6 =
+struct nf_conntrack_l4proto nf_conntrack_l4proto_udp6 __read_mostly =
{
.l3proto = PF_INET6,
- .proto = IPPROTO_UDP,
+ .l4proto = IPPROTO_UDP,
.name = "udp",
.pkt_to_tuple = udp_pkt_to_tuple,
.invert_tuple = udp_invert_tuple,
.print_tuple = udp_print_tuple,
- .print_conntrack = udp_print_conntrack,
.packet = udp_packet,
.new = udp_new,
- .error = udp_error6,
-#if defined(CONFIG_NF_CT_NETLINK) || \
- defined(CONFIG_NF_CT_NETLINK_MODULE)
- .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
- .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
+ .error = udp_error,
+#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
+ .tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
+ .nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
+ .nlattr_tuple_size = nf_ct_port_nlattr_tuple_size,
+ .nla_policy = nf_ct_port_nla_policy,
+#endif
+#ifdef CONFIG_SYSCTL
+ .ctl_table_users = &udp_sysctl_table_users,
+ .ctl_table_header = &udp_sysctl_header,
+ .ctl_table = udp_sysctl_table,
#endif
};
-
-EXPORT_SYMBOL(nf_conntrack_protocol_udp4);
-EXPORT_SYMBOL(nf_conntrack_protocol_udp6);
+EXPORT_SYMBOL_GPL(nf_conntrack_l4proto_udp6);