ia64/linux-2.6.18-xen.hg

view net/netfilter/nf_conntrack_proto_udp.c @ 871:9cbcc9008446

xen/x86: don't initialize cpu_data[]'s apicid field on generic code

Afaict, this is not only redundant with the intialization done in
drivers/xen/core/smpboot.c, but actually results - at least for
secondary CPUs - in the Xen-specific value written to be later
overwritten with whatever the generic code determines (with no
guarantee that the two values are identical).

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu May 14 10:09:15 2009 +0100 (2009-05-14)
parents 831230e53067
children
line source
1 /* (C) 1999-2001 Paul `Rusty' Russell
2 * (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License version 2 as
6 * published by the Free Software Foundation.
7 *
8 * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp>
9 * - enable working with Layer 3 protocol independent connection tracking.
10 *
11 * Derived from net/ipv4/netfilter/ip_conntrack_proto_udp.c
12 */
14 #include <linux/types.h>
15 #include <linux/sched.h>
16 #include <linux/timer.h>
17 #include <linux/module.h>
18 #include <linux/netfilter.h>
19 #include <linux/udp.h>
20 #include <linux/seq_file.h>
21 #include <linux/skbuff.h>
22 #include <linux/ipv6.h>
23 #include <net/ip6_checksum.h>
24 #include <net/checksum.h>
25 #include <linux/netfilter.h>
26 #include <linux/netfilter_ipv4.h>
27 #include <linux/netfilter_ipv6.h>
28 #include <net/netfilter/nf_conntrack_protocol.h>
30 unsigned int nf_ct_udp_timeout = 30*HZ;
31 unsigned int nf_ct_udp_timeout_stream = 180*HZ;
33 static int udp_pkt_to_tuple(const struct sk_buff *skb,
34 unsigned int dataoff,
35 struct nf_conntrack_tuple *tuple)
36 {
37 struct udphdr _hdr, *hp;
39 /* Actually only need first 8 bytes. */
40 hp = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
41 if (hp == NULL)
42 return 0;
44 tuple->src.u.udp.port = hp->source;
45 tuple->dst.u.udp.port = hp->dest;
47 return 1;
48 }
50 static int udp_invert_tuple(struct nf_conntrack_tuple *tuple,
51 const struct nf_conntrack_tuple *orig)
52 {
53 tuple->src.u.udp.port = orig->dst.u.udp.port;
54 tuple->dst.u.udp.port = orig->src.u.udp.port;
55 return 1;
56 }
58 /* Print out the per-protocol part of the tuple. */
59 static int udp_print_tuple(struct seq_file *s,
60 const struct nf_conntrack_tuple *tuple)
61 {
62 return seq_printf(s, "sport=%hu dport=%hu ",
63 ntohs(tuple->src.u.udp.port),
64 ntohs(tuple->dst.u.udp.port));
65 }
67 /* Print out the private part of the conntrack. */
68 static int udp_print_conntrack(struct seq_file *s,
69 const struct nf_conn *conntrack)
70 {
71 return 0;
72 }
74 /* Returns verdict for packet, and may modify conntracktype */
75 static int udp_packet(struct nf_conn *conntrack,
76 const struct sk_buff *skb,
77 unsigned int dataoff,
78 enum ip_conntrack_info ctinfo,
79 int pf,
80 unsigned int hooknum)
81 {
82 /* If we've seen traffic both ways, this is some kind of UDP
83 stream. Extend timeout. */
84 if (test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)) {
85 nf_ct_refresh_acct(conntrack, ctinfo, skb,
86 nf_ct_udp_timeout_stream);
87 /* Also, more likely to be important, and not a probe */
88 if (!test_and_set_bit(IPS_ASSURED_BIT, &conntrack->status))
89 nf_conntrack_event_cache(IPCT_STATUS, skb);
90 } else
91 nf_ct_refresh_acct(conntrack, ctinfo, skb, nf_ct_udp_timeout);
93 return NF_ACCEPT;
94 }
96 /* Called when a new connection for this protocol found. */
97 static int udp_new(struct nf_conn *conntrack, const struct sk_buff *skb,
98 unsigned int dataoff)
99 {
100 return 1;
101 }
103 static int udp_error(struct sk_buff *skb, unsigned int dataoff,
104 enum ip_conntrack_info *ctinfo,
105 int pf,
106 unsigned int hooknum)
107 {
108 unsigned int udplen = skb->len - dataoff;
109 struct udphdr _hdr, *hdr;
111 /* Header is too small? */
112 hdr = skb_header_pointer(skb, dataoff, sizeof(_hdr), &_hdr);
113 if (hdr == NULL) {
114 if (LOG_INVALID(IPPROTO_UDP))
115 nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
116 "nf_ct_udp: short packet ");
117 return -NF_ACCEPT;
118 }
120 /* Truncated/malformed packets */
121 if (ntohs(hdr->len) > udplen || ntohs(hdr->len) < sizeof(*hdr)) {
122 if (LOG_INVALID(IPPROTO_UDP))
123 nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
124 "nf_ct_udp: truncated/malformed packet ");
125 return -NF_ACCEPT;
126 }
128 /* Packet with no checksum */
129 if (!hdr->check)
130 return NF_ACCEPT;
132 /* Checksum invalid? Ignore.
133 * We skip checking packets on the outgoing path
134 * because the semantic of CHECKSUM_HW is different there
135 * and moreover root might send raw packets.
136 * FIXME: Source route IP option packets --RR */
137 if (nf_conntrack_checksum &&
138 ((pf == PF_INET && hooknum == NF_IP_PRE_ROUTING) ||
139 (pf == PF_INET6 && hooknum == NF_IP6_PRE_ROUTING)) &&
140 nf_checksum(skb, hooknum, dataoff, IPPROTO_UDP, pf)) {
141 if (LOG_INVALID(IPPROTO_UDP))
142 nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
143 "nf_ct_udp: bad UDP checksum ");
144 return -NF_ACCEPT;
145 }
147 return NF_ACCEPT;
148 }
150 struct nf_conntrack_protocol nf_conntrack_protocol_udp4 =
151 {
152 .l3proto = PF_INET,
153 .proto = IPPROTO_UDP,
154 .name = "udp",
155 .pkt_to_tuple = udp_pkt_to_tuple,
156 .invert_tuple = udp_invert_tuple,
157 .print_tuple = udp_print_tuple,
158 .print_conntrack = udp_print_conntrack,
159 .packet = udp_packet,
160 .new = udp_new,
161 .error = udp_error,
162 #if defined(CONFIG_NF_CT_NETLINK) || \
163 defined(CONFIG_NF_CT_NETLINK_MODULE)
164 .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
165 .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
166 #endif
167 };
169 struct nf_conntrack_protocol nf_conntrack_protocol_udp6 =
170 {
171 .l3proto = PF_INET6,
172 .proto = IPPROTO_UDP,
173 .name = "udp",
174 .pkt_to_tuple = udp_pkt_to_tuple,
175 .invert_tuple = udp_invert_tuple,
176 .print_tuple = udp_print_tuple,
177 .print_conntrack = udp_print_conntrack,
178 .packet = udp_packet,
179 .new = udp_new,
180 .error = udp_error,
181 #if defined(CONFIG_NF_CT_NETLINK) || \
182 defined(CONFIG_NF_CT_NETLINK_MODULE)
183 .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
184 .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
185 #endif
186 };
188 EXPORT_SYMBOL(nf_conntrack_protocol_udp4);
189 EXPORT_SYMBOL(nf_conntrack_protocol_udp6);