Signed-off-by: Patrick McHardy <kaber@trash.net> Signed-off-by: David S. Miller <davem@davemloft.net>
649 lines
16 KiB
C
649 lines
16 KiB
C
/* netfilter.c: look after the filters for various protocols.
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* Heavily influenced by the old firewall.c by David Bonn and Alan Cox.
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*
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* Thanks to Rob `CmdrTaco' Malda for not influencing this code in any
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* way.
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*
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* Rusty Russell (C)2000 -- This code is GPL.
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*
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* February 2000: Modified by James Morris to have 1 queue per protocol.
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* 15-Mar-2000: Added NF_REPEAT --RR.
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* 08-May-2003: Internal logging interface added by Jozsef Kadlecsik.
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*/
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#include <linux/config.h>
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#include <linux/kernel.h>
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#include <linux/netfilter.h>
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#include <net/protocol.h>
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#include <linux/init.h>
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#include <linux/skbuff.h>
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#include <linux/wait.h>
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#include <linux/module.h>
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#include <linux/interrupt.h>
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#include <linux/if.h>
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#include <linux/netdevice.h>
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#include <linux/inetdevice.h>
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#include <linux/tcp.h>
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#include <linux/udp.h>
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#include <linux/icmp.h>
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#include <net/sock.h>
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#include <net/route.h>
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#include <linux/ip.h>
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/* In this code, we can be waiting indefinitely for userspace to
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* service a packet if a hook returns NF_QUEUE. We could keep a count
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* of skbuffs queued for userspace, and not deregister a hook unless
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* this is zero, but that sucks. Now, we simply check when the
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* packets come back: if the hook is gone, the packet is discarded. */
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#ifdef CONFIG_NETFILTER_DEBUG
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#define NFDEBUG(format, args...) printk(format , ## args)
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#else
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#define NFDEBUG(format, args...)
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#endif
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/* Sockopts only registered and called from user context, so
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net locking would be overkill. Also, [gs]etsockopt calls may
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sleep. */
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static DECLARE_MUTEX(nf_sockopt_mutex);
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struct list_head nf_hooks[NPROTO][NF_MAX_HOOKS];
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static LIST_HEAD(nf_sockopts);
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static DEFINE_SPINLOCK(nf_hook_lock);
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/*
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* A queue handler may be registered for each protocol. Each is protected by
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* long term mutex. The handler must provide an an outfn() to accept packets
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* for queueing and must reinject all packets it receives, no matter what.
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*/
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static struct nf_queue_handler_t {
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nf_queue_outfn_t outfn;
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void *data;
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} queue_handler[NPROTO];
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static DEFINE_RWLOCK(queue_handler_lock);
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int nf_register_hook(struct nf_hook_ops *reg)
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{
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struct list_head *i;
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spin_lock_bh(&nf_hook_lock);
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list_for_each(i, &nf_hooks[reg->pf][reg->hooknum]) {
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if (reg->priority < ((struct nf_hook_ops *)i)->priority)
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break;
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}
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list_add_rcu(®->list, i->prev);
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spin_unlock_bh(&nf_hook_lock);
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synchronize_net();
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return 0;
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}
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void nf_unregister_hook(struct nf_hook_ops *reg)
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{
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spin_lock_bh(&nf_hook_lock);
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list_del_rcu(®->list);
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spin_unlock_bh(&nf_hook_lock);
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synchronize_net();
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}
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/* Do exclusive ranges overlap? */
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static inline int overlap(int min1, int max1, int min2, int max2)
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{
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return max1 > min2 && min1 < max2;
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}
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/* Functions to register sockopt ranges (exclusive). */
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int nf_register_sockopt(struct nf_sockopt_ops *reg)
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{
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struct list_head *i;
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int ret = 0;
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if (down_interruptible(&nf_sockopt_mutex) != 0)
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return -EINTR;
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list_for_each(i, &nf_sockopts) {
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struct nf_sockopt_ops *ops = (struct nf_sockopt_ops *)i;
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if (ops->pf == reg->pf
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&& (overlap(ops->set_optmin, ops->set_optmax,
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reg->set_optmin, reg->set_optmax)
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|| overlap(ops->get_optmin, ops->get_optmax,
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reg->get_optmin, reg->get_optmax))) {
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NFDEBUG("nf_sock overlap: %u-%u/%u-%u v %u-%u/%u-%u\n",
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ops->set_optmin, ops->set_optmax,
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ops->get_optmin, ops->get_optmax,
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reg->set_optmin, reg->set_optmax,
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reg->get_optmin, reg->get_optmax);
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ret = -EBUSY;
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goto out;
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}
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}
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list_add(®->list, &nf_sockopts);
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out:
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up(&nf_sockopt_mutex);
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return ret;
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}
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void nf_unregister_sockopt(struct nf_sockopt_ops *reg)
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{
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/* No point being interruptible: we're probably in cleanup_module() */
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restart:
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down(&nf_sockopt_mutex);
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if (reg->use != 0) {
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/* To be woken by nf_sockopt call... */
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/* FIXME: Stuart Young's name appears gratuitously. */
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set_current_state(TASK_UNINTERRUPTIBLE);
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reg->cleanup_task = current;
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up(&nf_sockopt_mutex);
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schedule();
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goto restart;
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}
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list_del(®->list);
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up(&nf_sockopt_mutex);
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}
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/* Call get/setsockopt() */
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static int nf_sockopt(struct sock *sk, int pf, int val,
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char __user *opt, int *len, int get)
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{
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struct list_head *i;
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struct nf_sockopt_ops *ops;
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int ret;
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if (down_interruptible(&nf_sockopt_mutex) != 0)
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return -EINTR;
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list_for_each(i, &nf_sockopts) {
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ops = (struct nf_sockopt_ops *)i;
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if (ops->pf == pf) {
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if (get) {
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if (val >= ops->get_optmin
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&& val < ops->get_optmax) {
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ops->use++;
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up(&nf_sockopt_mutex);
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ret = ops->get(sk, val, opt, len);
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goto out;
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}
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} else {
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if (val >= ops->set_optmin
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&& val < ops->set_optmax) {
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ops->use++;
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up(&nf_sockopt_mutex);
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ret = ops->set(sk, val, opt, *len);
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goto out;
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}
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}
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}
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}
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up(&nf_sockopt_mutex);
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return -ENOPROTOOPT;
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out:
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down(&nf_sockopt_mutex);
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ops->use--;
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if (ops->cleanup_task)
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wake_up_process(ops->cleanup_task);
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up(&nf_sockopt_mutex);
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return ret;
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}
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int nf_setsockopt(struct sock *sk, int pf, int val, char __user *opt,
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int len)
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{
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return nf_sockopt(sk, pf, val, opt, &len, 0);
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}
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int nf_getsockopt(struct sock *sk, int pf, int val, char __user *opt, int *len)
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{
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return nf_sockopt(sk, pf, val, opt, len, 1);
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}
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static unsigned int nf_iterate(struct list_head *head,
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struct sk_buff **skb,
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int hook,
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const struct net_device *indev,
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const struct net_device *outdev,
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struct list_head **i,
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int (*okfn)(struct sk_buff *),
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int hook_thresh)
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{
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unsigned int verdict;
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/*
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* The caller must not block between calls to this
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* function because of risk of continuing from deleted element.
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*/
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list_for_each_continue_rcu(*i, head) {
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struct nf_hook_ops *elem = (struct nf_hook_ops *)*i;
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if (hook_thresh > elem->priority)
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continue;
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/* Optimization: we don't need to hold module
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reference here, since function can't sleep. --RR */
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verdict = elem->hook(hook, skb, indev, outdev, okfn);
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if (verdict != NF_ACCEPT) {
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#ifdef CONFIG_NETFILTER_DEBUG
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if (unlikely(verdict > NF_MAX_VERDICT)) {
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NFDEBUG("Evil return from %p(%u).\n",
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elem->hook, hook);
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continue;
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}
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#endif
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if (verdict != NF_REPEAT)
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return verdict;
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*i = (*i)->prev;
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}
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}
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return NF_ACCEPT;
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}
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int nf_register_queue_handler(int pf, nf_queue_outfn_t outfn, void *data)
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{
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int ret;
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write_lock_bh(&queue_handler_lock);
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if (queue_handler[pf].outfn)
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ret = -EBUSY;
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else {
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queue_handler[pf].outfn = outfn;
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queue_handler[pf].data = data;
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ret = 0;
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}
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write_unlock_bh(&queue_handler_lock);
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return ret;
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}
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/* The caller must flush their queue before this */
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int nf_unregister_queue_handler(int pf)
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{
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write_lock_bh(&queue_handler_lock);
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queue_handler[pf].outfn = NULL;
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queue_handler[pf].data = NULL;
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write_unlock_bh(&queue_handler_lock);
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return 0;
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}
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/*
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* Any packet that leaves via this function must come back
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* through nf_reinject().
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*/
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static int nf_queue(struct sk_buff *skb,
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struct list_head *elem,
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int pf, unsigned int hook,
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struct net_device *indev,
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struct net_device *outdev,
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int (*okfn)(struct sk_buff *))
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{
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int status;
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struct nf_info *info;
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#ifdef CONFIG_BRIDGE_NETFILTER
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struct net_device *physindev = NULL;
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struct net_device *physoutdev = NULL;
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#endif
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/* QUEUE == DROP if noone is waiting, to be safe. */
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read_lock(&queue_handler_lock);
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if (!queue_handler[pf].outfn) {
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read_unlock(&queue_handler_lock);
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kfree_skb(skb);
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return 1;
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}
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info = kmalloc(sizeof(*info), GFP_ATOMIC);
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if (!info) {
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if (net_ratelimit())
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printk(KERN_ERR "OOM queueing packet %p\n",
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skb);
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read_unlock(&queue_handler_lock);
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kfree_skb(skb);
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return 1;
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}
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*info = (struct nf_info) {
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(struct nf_hook_ops *)elem, pf, hook, indev, outdev, okfn };
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/* If it's going away, ignore hook. */
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if (!try_module_get(info->elem->owner)) {
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read_unlock(&queue_handler_lock);
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kfree(info);
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return 0;
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}
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/* Bump dev refs so they don't vanish while packet is out */
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if (indev) dev_hold(indev);
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if (outdev) dev_hold(outdev);
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#ifdef CONFIG_BRIDGE_NETFILTER
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if (skb->nf_bridge) {
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physindev = skb->nf_bridge->physindev;
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if (physindev) dev_hold(physindev);
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physoutdev = skb->nf_bridge->physoutdev;
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if (physoutdev) dev_hold(physoutdev);
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}
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#endif
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status = queue_handler[pf].outfn(skb, info, queue_handler[pf].data);
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read_unlock(&queue_handler_lock);
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if (status < 0) {
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/* James M doesn't say fuck enough. */
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if (indev) dev_put(indev);
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if (outdev) dev_put(outdev);
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#ifdef CONFIG_BRIDGE_NETFILTER
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if (physindev) dev_put(physindev);
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if (physoutdev) dev_put(physoutdev);
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#endif
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module_put(info->elem->owner);
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kfree(info);
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kfree_skb(skb);
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return 1;
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}
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return 1;
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}
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/* Returns 1 if okfn() needs to be executed by the caller,
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* -EPERM for NF_DROP, 0 otherwise. */
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int nf_hook_slow(int pf, unsigned int hook, struct sk_buff **pskb,
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struct net_device *indev,
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struct net_device *outdev,
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int (*okfn)(struct sk_buff *),
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int hook_thresh)
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{
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struct list_head *elem;
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unsigned int verdict;
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int ret = 0;
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/* We may already have this, but read-locks nest anyway */
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rcu_read_lock();
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elem = &nf_hooks[pf][hook];
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next_hook:
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verdict = nf_iterate(&nf_hooks[pf][hook], pskb, hook, indev,
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outdev, &elem, okfn, hook_thresh);
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if (verdict == NF_ACCEPT || verdict == NF_STOP) {
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ret = 1;
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goto unlock;
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} else if (verdict == NF_DROP) {
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kfree_skb(*pskb);
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ret = -EPERM;
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} else if (verdict == NF_QUEUE) {
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NFDEBUG("nf_hook: Verdict = QUEUE.\n");
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if (!nf_queue(*pskb, elem, pf, hook, indev, outdev, okfn))
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goto next_hook;
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}
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unlock:
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rcu_read_unlock();
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return ret;
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}
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void nf_reinject(struct sk_buff *skb, struct nf_info *info,
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unsigned int verdict)
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{
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struct list_head *elem = &info->elem->list;
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struct list_head *i;
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rcu_read_lock();
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/* Release those devices we held, or Alexey will kill me. */
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if (info->indev) dev_put(info->indev);
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if (info->outdev) dev_put(info->outdev);
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#ifdef CONFIG_BRIDGE_NETFILTER
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if (skb->nf_bridge) {
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if (skb->nf_bridge->physindev)
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dev_put(skb->nf_bridge->physindev);
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if (skb->nf_bridge->physoutdev)
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dev_put(skb->nf_bridge->physoutdev);
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}
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#endif
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/* Drop reference to owner of hook which queued us. */
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module_put(info->elem->owner);
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list_for_each_rcu(i, &nf_hooks[info->pf][info->hook]) {
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if (i == elem)
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break;
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}
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if (elem == &nf_hooks[info->pf][info->hook]) {
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/* The module which sent it to userspace is gone. */
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NFDEBUG("%s: module disappeared, dropping packet.\n",
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__FUNCTION__);
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verdict = NF_DROP;
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}
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/* Continue traversal iff userspace said ok... */
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if (verdict == NF_REPEAT) {
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elem = elem->prev;
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verdict = NF_ACCEPT;
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}
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if (verdict == NF_ACCEPT) {
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next_hook:
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verdict = nf_iterate(&nf_hooks[info->pf][info->hook],
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&skb, info->hook,
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info->indev, info->outdev, &elem,
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info->okfn, INT_MIN);
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}
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switch (verdict) {
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case NF_ACCEPT:
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info->okfn(skb);
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break;
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case NF_QUEUE:
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if (!nf_queue(skb, elem, info->pf, info->hook,
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info->indev, info->outdev, info->okfn))
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goto next_hook;
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break;
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}
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rcu_read_unlock();
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if (verdict == NF_DROP)
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kfree_skb(skb);
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kfree(info);
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return;
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}
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#ifdef CONFIG_INET
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/* route_me_harder function, used by iptable_nat, iptable_mangle + ip_queue */
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int ip_route_me_harder(struct sk_buff **pskb)
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{
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struct iphdr *iph = (*pskb)->nh.iph;
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struct rtable *rt;
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struct flowi fl = {};
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struct dst_entry *odst;
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unsigned int hh_len;
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/* some non-standard hacks like ipt_REJECT.c:send_reset() can cause
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* packets with foreign saddr to appear on the NF_IP_LOCAL_OUT hook.
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*/
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if (inet_addr_type(iph->saddr) == RTN_LOCAL) {
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fl.nl_u.ip4_u.daddr = iph->daddr;
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fl.nl_u.ip4_u.saddr = iph->saddr;
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fl.nl_u.ip4_u.tos = RT_TOS(iph->tos);
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fl.oif = (*pskb)->sk ? (*pskb)->sk->sk_bound_dev_if : 0;
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#ifdef CONFIG_IP_ROUTE_FWMARK
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fl.nl_u.ip4_u.fwmark = (*pskb)->nfmark;
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#endif
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fl.proto = iph->protocol;
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if (ip_route_output_key(&rt, &fl) != 0)
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return -1;
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/* Drop old route. */
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dst_release((*pskb)->dst);
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(*pskb)->dst = &rt->u.dst;
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} else {
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/* non-local src, find valid iif to satisfy
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* rp-filter when calling ip_route_input. */
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fl.nl_u.ip4_u.daddr = iph->saddr;
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if (ip_route_output_key(&rt, &fl) != 0)
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return -1;
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odst = (*pskb)->dst;
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if (ip_route_input(*pskb, iph->daddr, iph->saddr,
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RT_TOS(iph->tos), rt->u.dst.dev) != 0) {
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dst_release(&rt->u.dst);
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return -1;
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}
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dst_release(&rt->u.dst);
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dst_release(odst);
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}
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if ((*pskb)->dst->error)
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return -1;
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/* Change in oif may mean change in hh_len. */
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hh_len = (*pskb)->dst->dev->hard_header_len;
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if (skb_headroom(*pskb) < hh_len) {
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struct sk_buff *nskb;
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nskb = skb_realloc_headroom(*pskb, hh_len);
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if (!nskb)
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return -1;
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if ((*pskb)->sk)
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skb_set_owner_w(nskb, (*pskb)->sk);
|
|
kfree_skb(*pskb);
|
|
*pskb = nskb;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ip_route_me_harder);
|
|
|
|
int skb_ip_make_writable(struct sk_buff **pskb, unsigned int writable_len)
|
|
{
|
|
struct sk_buff *nskb;
|
|
|
|
if (writable_len > (*pskb)->len)
|
|
return 0;
|
|
|
|
/* Not exclusive use of packet? Must copy. */
|
|
if (skb_shared(*pskb) || skb_cloned(*pskb))
|
|
goto copy_skb;
|
|
|
|
return pskb_may_pull(*pskb, writable_len);
|
|
|
|
copy_skb:
|
|
nskb = skb_copy(*pskb, GFP_ATOMIC);
|
|
if (!nskb)
|
|
return 0;
|
|
BUG_ON(skb_is_nonlinear(nskb));
|
|
|
|
/* Rest of kernel will get very unhappy if we pass it a
|
|
suddenly-orphaned skbuff */
|
|
if ((*pskb)->sk)
|
|
skb_set_owner_w(nskb, (*pskb)->sk);
|
|
kfree_skb(*pskb);
|
|
*pskb = nskb;
|
|
return 1;
|
|
}
|
|
EXPORT_SYMBOL(skb_ip_make_writable);
|
|
#endif /*CONFIG_INET*/
|
|
|
|
/* Internal logging interface, which relies on the real
|
|
LOG target modules */
|
|
|
|
#define NF_LOG_PREFIXLEN 128
|
|
|
|
static nf_logfn *nf_logging[NPROTO]; /* = NULL */
|
|
static int reported = 0;
|
|
static DEFINE_SPINLOCK(nf_log_lock);
|
|
|
|
int nf_log_register(int pf, nf_logfn *logfn)
|
|
{
|
|
int ret = -EBUSY;
|
|
|
|
/* Any setup of logging members must be done before
|
|
* substituting pointer. */
|
|
spin_lock(&nf_log_lock);
|
|
if (!nf_logging[pf]) {
|
|
rcu_assign_pointer(nf_logging[pf], logfn);
|
|
ret = 0;
|
|
}
|
|
spin_unlock(&nf_log_lock);
|
|
return ret;
|
|
}
|
|
|
|
void nf_log_unregister(int pf, nf_logfn *logfn)
|
|
{
|
|
spin_lock(&nf_log_lock);
|
|
if (nf_logging[pf] == logfn)
|
|
nf_logging[pf] = NULL;
|
|
spin_unlock(&nf_log_lock);
|
|
|
|
/* Give time to concurrent readers. */
|
|
synchronize_net();
|
|
}
|
|
|
|
void nf_log_packet(int pf,
|
|
unsigned int hooknum,
|
|
const struct sk_buff *skb,
|
|
const struct net_device *in,
|
|
const struct net_device *out,
|
|
const char *fmt, ...)
|
|
{
|
|
va_list args;
|
|
char prefix[NF_LOG_PREFIXLEN];
|
|
nf_logfn *logfn;
|
|
|
|
rcu_read_lock();
|
|
logfn = rcu_dereference(nf_logging[pf]);
|
|
if (logfn) {
|
|
va_start(args, fmt);
|
|
vsnprintf(prefix, sizeof(prefix), fmt, args);
|
|
va_end(args);
|
|
/* We must read logging before nf_logfn[pf] */
|
|
logfn(hooknum, skb, in, out, prefix);
|
|
} else if (!reported) {
|
|
printk(KERN_WARNING "nf_log_packet: can\'t log yet, "
|
|
"no backend logging module loaded in!\n");
|
|
reported++;
|
|
}
|
|
rcu_read_unlock();
|
|
}
|
|
EXPORT_SYMBOL(nf_log_register);
|
|
EXPORT_SYMBOL(nf_log_unregister);
|
|
EXPORT_SYMBOL(nf_log_packet);
|
|
|
|
/* This does not belong here, but locally generated errors need it if connection
|
|
tracking in use: without this, connection may not be in hash table, and hence
|
|
manufactured ICMP or RST packets will not be associated with it. */
|
|
void (*ip_ct_attach)(struct sk_buff *, struct sk_buff *);
|
|
|
|
void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb)
|
|
{
|
|
void (*attach)(struct sk_buff *, struct sk_buff *);
|
|
|
|
if (skb->nfct && (attach = ip_ct_attach) != NULL) {
|
|
mb(); /* Just to be sure: must be read before executing this */
|
|
attach(new, skb);
|
|
}
|
|
}
|
|
|
|
void __init netfilter_init(void)
|
|
{
|
|
int i, h;
|
|
|
|
for (i = 0; i < NPROTO; i++) {
|
|
for (h = 0; h < NF_MAX_HOOKS; h++)
|
|
INIT_LIST_HEAD(&nf_hooks[i][h]);
|
|
}
|
|
}
|
|
|
|
EXPORT_SYMBOL(ip_ct_attach);
|
|
EXPORT_SYMBOL(nf_ct_attach);
|
|
EXPORT_SYMBOL(nf_getsockopt);
|
|
EXPORT_SYMBOL(nf_hook_slow);
|
|
EXPORT_SYMBOL(nf_hooks);
|
|
EXPORT_SYMBOL(nf_register_hook);
|
|
EXPORT_SYMBOL(nf_register_queue_handler);
|
|
EXPORT_SYMBOL(nf_register_sockopt);
|
|
EXPORT_SYMBOL(nf_reinject);
|
|
EXPORT_SYMBOL(nf_setsockopt);
|
|
EXPORT_SYMBOL(nf_unregister_hook);
|
|
EXPORT_SYMBOL(nf_unregister_queue_handler);
|
|
EXPORT_SYMBOL(nf_unregister_sockopt);
|