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authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-16 15:20:36 -0700
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /net/ipv6/netfilter/ip6t_owner.c
Linux-2.6.12-rc2
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!
Diffstat (limited to 'net/ipv6/netfilter/ip6t_owner.c')
-rw-r--r--net/ipv6/netfilter/ip6t_owner.c174
1 files changed, 174 insertions, 0 deletions
diff --git a/net/ipv6/netfilter/ip6t_owner.c b/net/ipv6/netfilter/ip6t_owner.c
new file mode 100644
index 00000000000..ab0e32d3de4
--- /dev/null
+++ b/net/ipv6/netfilter/ip6t_owner.c
@@ -0,0 +1,174 @@
+/* Kernel module to match various things tied to sockets associated with
+ locally generated outgoing packets. */
+
+/* (C) 2000-2001 Marc Boucher <marc@mbsi.ca>
+ *
+ * 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/skbuff.h>
+#include <linux/file.h>
+#include <net/sock.h>
+
+#include <linux/netfilter_ipv6/ip6t_owner.h>
+#include <linux/netfilter_ipv6/ip6_tables.h>
+
+MODULE_AUTHOR("Marc Boucher <marc@mbsi.ca>");
+MODULE_DESCRIPTION("IP6 tables owner matching module");
+MODULE_LICENSE("GPL");
+
+static int
+match_pid(const struct sk_buff *skb, pid_t pid)
+{
+ struct task_struct *p;
+ struct files_struct *files;
+ int i;
+
+ read_lock(&tasklist_lock);
+ p = find_task_by_pid(pid);
+ if (!p)
+ goto out;
+ task_lock(p);
+ files = p->files;
+ if(files) {
+ spin_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+ if (fcheck_files(files, i) == skb->sk->sk_socket->file) {
+ spin_unlock(&files->file_lock);
+ task_unlock(p);
+ read_unlock(&tasklist_lock);
+ return 1;
+ }
+ }
+ spin_unlock(&files->file_lock);
+ }
+ task_unlock(p);
+out:
+ read_unlock(&tasklist_lock);
+ return 0;
+}
+
+static int
+match_sid(const struct sk_buff *skb, pid_t sid)
+{
+ struct task_struct *g, *p;
+ struct file *file = skb->sk->sk_socket->file;
+ int i, found=0;
+
+ read_lock(&tasklist_lock);
+ do_each_thread(g, p) {
+ struct files_struct *files;
+ if (p->signal->session != sid)
+ continue;
+
+ task_lock(p);
+ files = p->files;
+ if (files) {
+ spin_lock(&files->file_lock);
+ for (i=0; i < files->max_fds; i++) {
+ if (fcheck_files(files, i) == file) {
+ found = 1;
+ break;
+ }
+ }
+ spin_unlock(&files->file_lock);
+ }
+ task_unlock(p);
+ if (found)
+ goto out;
+ } while_each_thread(g, p);
+out:
+ read_unlock(&tasklist_lock);
+
+ return found;
+}
+
+static int
+match(const struct sk_buff *skb,
+ const struct net_device *in,
+ const struct net_device *out,
+ const void *matchinfo,
+ int offset,
+ unsigned int protoff,
+ int *hotdrop)
+{
+ const struct ip6t_owner_info *info = matchinfo;
+
+ if (!skb->sk || !skb->sk->sk_socket || !skb->sk->sk_socket->file)
+ return 0;
+
+ if(info->match & IP6T_OWNER_UID) {
+ if((skb->sk->sk_socket->file->f_uid != info->uid) ^
+ !!(info->invert & IP6T_OWNER_UID))
+ return 0;
+ }
+
+ if(info->match & IP6T_OWNER_GID) {
+ if((skb->sk->sk_socket->file->f_gid != info->gid) ^
+ !!(info->invert & IP6T_OWNER_GID))
+ return 0;
+ }
+
+ if(info->match & IP6T_OWNER_PID) {
+ if (!match_pid(skb, info->pid) ^
+ !!(info->invert & IP6T_OWNER_PID))
+ return 0;
+ }
+
+ if(info->match & IP6T_OWNER_SID) {
+ if (!match_sid(skb, info->sid) ^
+ !!(info->invert & IP6T_OWNER_SID))
+ return 0;
+ }
+
+ return 1;
+}
+
+static int
+checkentry(const char *tablename,
+ const struct ip6t_ip6 *ip,
+ void *matchinfo,
+ unsigned int matchsize,
+ unsigned int hook_mask)
+{
+ if (hook_mask
+ & ~((1 << NF_IP6_LOCAL_OUT) | (1 << NF_IP6_POST_ROUTING))) {
+ printk("ip6t_owner: only valid for LOCAL_OUT or POST_ROUTING.\n");
+ return 0;
+ }
+
+ if (matchsize != IP6T_ALIGN(sizeof(struct ip6t_owner_info)))
+ return 0;
+#ifdef CONFIG_SMP
+ /* files->file_lock can not be used in a BH */
+ if (((struct ip6t_owner_info *)matchinfo)->match
+ & (IP6T_OWNER_PID|IP6T_OWNER_SID)) {
+ printk("ip6t_owner: pid and sid matching is broken on SMP.\n");
+ return 0;
+ }
+#endif
+ return 1;
+}
+
+static struct ip6t_match owner_match = {
+ .name = "owner",
+ .match = &match,
+ .checkentry = &checkentry,
+ .me = THIS_MODULE,
+};
+
+static int __init init(void)
+{
+ return ip6t_register_match(&owner_match);
+}
+
+static void __exit fini(void)
+{
+ ip6t_unregister_match(&owner_match);
+}
+
+module_init(init);
+module_exit(fini);