mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
synced 2024-10-20 02:19:01 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
125 lines
3.2 KiB
C
125 lines
3.2 KiB
C
/* Kernel module to match one of a list of TCP/UDP ports: ports are in
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the same place so we can treat them as equal. */
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/* (C) 1999-2001 Paul `Rusty' Russell
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* (C) 2002-2004 Netfilter Core Team <coreteam@netfilter.org>
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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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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/udp.h>
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#include <linux/skbuff.h>
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#include <linux/in.h>
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#include <linux/netfilter_ipv6/ip6t_multiport.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Netfilter Core Team <coreteam@netfilter.org>");
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MODULE_DESCRIPTION("ip6tables match for multiple ports");
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#if 0
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#define duprintf(format, args...) printk(format , ## args)
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#else
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#define duprintf(format, args...)
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#endif
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/* Returns 1 if the port is matched by the test, 0 otherwise. */
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static inline int
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ports_match(const u_int16_t *portlist, enum ip6t_multiport_flags flags,
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u_int8_t count, u_int16_t src, u_int16_t dst)
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{
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unsigned int i;
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for (i=0; i<count; i++) {
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if (flags != IP6T_MULTIPORT_DESTINATION
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&& portlist[i] == src)
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return 1;
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if (flags != IP6T_MULTIPORT_SOURCE
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&& portlist[i] == dst)
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return 1;
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}
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return 0;
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}
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static int
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match(const struct sk_buff *skb,
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const struct net_device *in,
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const struct net_device *out,
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const void *matchinfo,
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int offset,
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unsigned int protoff,
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int *hotdrop)
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{
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u16 _ports[2], *pptr;
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const struct ip6t_multiport *multiinfo = matchinfo;
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/* Must not be a fragment. */
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if (offset)
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return 0;
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/* Must be big enough to read ports (both UDP and TCP have
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them at the start). */
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pptr = skb_header_pointer(skb, protoff, sizeof(_ports), &_ports[0]);
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if (pptr == NULL) {
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/* We've been asked to examine this packet, and we
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* can't. Hence, no choice but to drop.
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*/
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duprintf("ip6t_multiport:"
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" Dropping evil offset=0 tinygram.\n");
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*hotdrop = 1;
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return 0;
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}
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return ports_match(multiinfo->ports,
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multiinfo->flags, multiinfo->count,
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ntohs(pptr[0]), ntohs(pptr[1]));
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}
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/* Called when user tries to insert an entry of this type. */
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static int
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checkentry(const char *tablename,
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const struct ip6t_ip6 *ip,
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void *matchinfo,
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unsigned int matchsize,
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unsigned int hook_mask)
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{
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const struct ip6t_multiport *multiinfo = matchinfo;
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_multiport)))
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return 0;
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/* Must specify proto == TCP/UDP, no unknown flags or bad count */
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return (ip->proto == IPPROTO_TCP || ip->proto == IPPROTO_UDP)
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&& !(ip->invflags & IP6T_INV_PROTO)
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&& matchsize == IP6T_ALIGN(sizeof(struct ip6t_multiport))
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&& (multiinfo->flags == IP6T_MULTIPORT_SOURCE
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|| multiinfo->flags == IP6T_MULTIPORT_DESTINATION
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|| multiinfo->flags == IP6T_MULTIPORT_EITHER)
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&& multiinfo->count <= IP6T_MULTI_PORTS;
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}
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static struct ip6t_match multiport_match = {
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.name = "multiport",
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.match = &match,
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.checkentry = &checkentry,
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.me = THIS_MODULE,
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};
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static int __init init(void)
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{
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return ip6t_register_match(&multiport_match);
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}
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static void __exit fini(void)
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{
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ip6t_unregister_match(&multiport_match);
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}
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module_init(init);
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module_exit(fini);
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