mirror of
https://github.com/team-infusion-developers/android_kernel_samsung_msm8976.git
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b835996f62
With the use of RCU in files structure, the look-up of files using fds can now be lock-free. The lookup is protected by rcu_read_lock()/rcu_read_unlock(). This patch changes the readers to use lock-free lookup. Signed-off-by: Maneesh Soni <maneesh@in.ibm.com> Signed-off-by: Ravikiran Thirumalai <kiran_th@gmail.com> Signed-off-by: Dipankar Sarma <dipankar@in.ibm.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
99 lines
2.3 KiB
C
99 lines
2.3 KiB
C
/* Kernel module to match various things tied to sockets associated with
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locally generated outgoing packets. */
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/* (C) 2000-2001 Marc Boucher <marc@mbsi.ca>
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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/skbuff.h>
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#include <linux/file.h>
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#include <linux/rcupdate.h>
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#include <net/sock.h>
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#include <linux/netfilter_ipv6/ip6t_owner.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
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MODULE_DESCRIPTION("IP6 tables owner matching module");
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MODULE_LICENSE("GPL");
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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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const struct ip6t_owner_info *info = matchinfo;
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if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
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return 0;
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if(info->match & IP6T_OWNER_UID) {
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if((skb->sk->sk_socket->file->f_uid != info->uid) ^
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!!(info->invert & IP6T_OWNER_UID))
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return 0;
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}
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if(info->match & IP6T_OWNER_GID) {
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if((skb->sk->sk_socket->file->f_gid != info->gid) ^
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!!(info->invert & IP6T_OWNER_GID))
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return 0;
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}
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return 1;
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}
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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_owner_info *info = matchinfo;
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if (hook_mask
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& ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) {
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printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
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return 0;
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}
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if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info)))
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return 0;
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if (info->match & (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
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printk("ipt_owner: pid and sid matching "
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"not supported anymore\n");
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return 0;
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}
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return 1;
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}
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static struct ip6t_match owner_match = {
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.name = "owner",
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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(&owner_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(&owner_match);
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}
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module_init(init);
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module_exit(fini);
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