Blame view
net/netfilter/nf_conntrack_core.c
42.8 KB
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/* Connection state tracking for netfilter. This is separated from, but required by, the NAT layer; it can also be used by an iptables extension. */ /* (C) 1999-2001 Paul `Rusty' Russell |
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* (C) 2002-2006 Netfilter Core Team <coreteam@netfilter.org> |
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* (C) 2003,2004 USAGI/WIDE Project <http://www.linux-ipv6.org> * * 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. |
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*/ |
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#include <linux/types.h> #include <linux/netfilter.h> #include <linux/module.h> |
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#include <linux/sched.h> |
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#include <linux/skbuff.h> #include <linux/proc_fs.h> #include <linux/vmalloc.h> #include <linux/stddef.h> #include <linux/slab.h> #include <linux/random.h> #include <linux/jhash.h> #include <linux/err.h> #include <linux/percpu.h> #include <linux/moduleparam.h> #include <linux/notifier.h> #include <linux/kernel.h> #include <linux/netdevice.h> #include <linux/socket.h> |
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#include <linux/mm.h> |
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#include <linux/nsproxy.h> |
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#include <linux/rculist_nulls.h> |
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|
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#include <net/netfilter/nf_conntrack.h> #include <net/netfilter/nf_conntrack_l3proto.h> |
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#include <net/netfilter/nf_conntrack_l4proto.h> |
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#include <net/netfilter/nf_conntrack_expect.h> |
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#include <net/netfilter/nf_conntrack_helper.h> #include <net/netfilter/nf_conntrack_core.h> |
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#include <net/netfilter/nf_conntrack_extend.h> |
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#include <net/netfilter/nf_conntrack_acct.h> |
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#include <net/netfilter/nf_conntrack_ecache.h> |
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#include <net/netfilter/nf_conntrack_zones.h> |
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#include <net/netfilter/nf_conntrack_timestamp.h> |
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#include <net/netfilter/nf_nat.h> |
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#include <net/netfilter/nf_nat_core.h> |
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|
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#define NF_CONNTRACK_VERSION "0.5.0" |
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|
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int (*nfnetlink_parse_nat_setup_hook)(struct nf_conn *ct, enum nf_nat_manip_type manip, |
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const struct nlattr *attr) __read_mostly; |
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EXPORT_SYMBOL_GPL(nfnetlink_parse_nat_setup_hook); |
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DEFINE_SPINLOCK(nf_conntrack_lock); |
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EXPORT_SYMBOL_GPL(nf_conntrack_lock); |
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|
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unsigned int nf_conntrack_htable_size __read_mostly; |
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EXPORT_SYMBOL_GPL(nf_conntrack_htable_size); |
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unsigned int nf_conntrack_max __read_mostly; |
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EXPORT_SYMBOL_GPL(nf_conntrack_max); |
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|
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DEFINE_PER_CPU(struct nf_conn, nf_conntrack_untracked); EXPORT_PER_CPU_SYMBOL(nf_conntrack_untracked); |
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|
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unsigned int nf_conntrack_hash_rnd __read_mostly; |
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EXPORT_SYMBOL_GPL(nf_conntrack_hash_rnd); |
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|
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static u32 hash_conntrack_raw(const struct nf_conntrack_tuple *tuple, u16 zone) |
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{ |
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unsigned int n; |
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/* The direction must be ignored, so we hash everything up to the * destination ports (which is a multiple of 4) and treat the last * three bytes manually. */ n = (sizeof(tuple->src) + sizeof(tuple->dst.u3)) / sizeof(u32); |
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return jhash2((u32 *)tuple, n, zone ^ nf_conntrack_hash_rnd ^ (((__force __u16)tuple->dst.u.all << 16) | tuple->dst.protonum)); } static u32 __hash_bucket(u32 hash, unsigned int size) { return ((u64)hash * size) >> 32; } static u32 hash_bucket(u32 hash, const struct net *net) { return __hash_bucket(hash, net->ct.htable_size); } |
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|
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static u_int32_t __hash_conntrack(const struct nf_conntrack_tuple *tuple, u16 zone, unsigned int size) { return __hash_bucket(hash_conntrack_raw(tuple, zone), size); |
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} |
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static inline u_int32_t hash_conntrack(const struct net *net, u16 zone, |
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const struct nf_conntrack_tuple *tuple) |
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{ |
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return __hash_conntrack(tuple, zone, net->ct.htable_size); |
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} |
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bool |
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nf_ct_get_tuple(const struct sk_buff *skb, unsigned int nhoff, unsigned int dataoff, u_int16_t l3num, u_int8_t protonum, struct nf_conntrack_tuple *tuple, const struct nf_conntrack_l3proto *l3proto, |
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const struct nf_conntrack_l4proto *l4proto) |
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{ |
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memset(tuple, 0, sizeof(*tuple)); |
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tuple->src.l3num = l3num; if (l3proto->pkt_to_tuple(skb, nhoff, tuple) == 0) |
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return false; |
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tuple->dst.protonum = protonum; tuple->dst.dir = IP_CT_DIR_ORIGINAL; |
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return l4proto->pkt_to_tuple(skb, dataoff, tuple); |
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} |
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EXPORT_SYMBOL_GPL(nf_ct_get_tuple); |
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|
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bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, u_int16_t l3num, struct nf_conntrack_tuple *tuple) |
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{ struct nf_conntrack_l3proto *l3proto; struct nf_conntrack_l4proto *l4proto; unsigned int protoff; u_int8_t protonum; int ret; rcu_read_lock(); l3proto = __nf_ct_l3proto_find(l3num); ret = l3proto->get_l4proto(skb, nhoff, &protoff, &protonum); if (ret != NF_ACCEPT) { rcu_read_unlock(); |
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return false; |
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} l4proto = __nf_ct_l4proto_find(l3num, protonum); ret = nf_ct_get_tuple(skb, nhoff, protoff, l3num, protonum, tuple, l3proto, l4proto); rcu_read_unlock(); return ret; } EXPORT_SYMBOL_GPL(nf_ct_get_tuplepr); |
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bool |
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nf_ct_invert_tuple(struct nf_conntrack_tuple *inverse, const struct nf_conntrack_tuple *orig, const struct nf_conntrack_l3proto *l3proto, |
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const struct nf_conntrack_l4proto *l4proto) |
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{ |
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memset(inverse, 0, sizeof(*inverse)); |
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inverse->src.l3num = orig->src.l3num; if (l3proto->invert_tuple(inverse, orig) == 0) |
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return false; |
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inverse->dst.dir = !orig->dst.dir; inverse->dst.protonum = orig->dst.protonum; |
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return l4proto->invert_tuple(inverse, orig); |
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} |
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EXPORT_SYMBOL_GPL(nf_ct_invert_tuple); |
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|
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static void clean_from_lists(struct nf_conn *ct) { |
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pr_debug("clean_from_lists(%p) ", ct); |
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hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode); |
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/* Destroy all pending expectations */ |
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nf_ct_remove_expectations(ct); |
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} static void destroy_conntrack(struct nf_conntrack *nfct) { struct nf_conn *ct = (struct nf_conn *)nfct; |
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struct net *net = nf_ct_net(ct); |
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struct nf_conntrack_l4proto *l4proto; |
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|
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pr_debug("destroy_conntrack(%p) ", ct); |
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NF_CT_ASSERT(atomic_read(&nfct->use) == 0); NF_CT_ASSERT(!timer_pending(&ct->timeout)); |
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/* To make sure we don't get any weird locking issues here: * destroy_conntrack() MUST NOT be called with a write lock * to nf_conntrack_lock!!! -HW */ |
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rcu_read_lock(); |
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l4proto = __nf_ct_l4proto_find(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
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if (l4proto && l4proto->destroy) l4proto->destroy(ct); |
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rcu_read_unlock(); |
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|
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spin_lock_bh(&nf_conntrack_lock); |
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/* Expectations will have been removed in clean_from_lists, * except TFTP can create an expectation on the first packet, * before connection is in the list, so we need to clean here, * too. */ |
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nf_ct_remove_expectations(ct); |
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/* We overload first tuple to link into unconfirmed list. */ if (!nf_ct_is_confirmed(ct)) { |
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BUG_ON(hlist_nulls_unhashed(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode)); hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
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} |
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NF_CT_STAT_INC(net, delete); |
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spin_unlock_bh(&nf_conntrack_lock); |
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if (ct->master) nf_ct_put(ct->master); |
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pr_debug("destroy_conntrack: returning ct=%p to slab ", ct); |
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nf_conntrack_free(ct); } |
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void nf_ct_delete_from_lists(struct nf_conn *ct) |
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{ |
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struct net *net = nf_ct_net(ct); |
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|
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nf_ct_helper_destroy(ct); |
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spin_lock_bh(&nf_conntrack_lock); |
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/* Inside lock so preempt is disabled on module removal path. * Otherwise we can get spurious warnings. */ |
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NF_CT_STAT_INC(net, delete_list); |
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clean_from_lists(ct); |
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spin_unlock_bh(&nf_conntrack_lock); |
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} EXPORT_SYMBOL_GPL(nf_ct_delete_from_lists); static void death_by_event(unsigned long ul_conntrack) { struct nf_conn *ct = (void *)ul_conntrack; struct net *net = nf_ct_net(ct); if (nf_conntrack_event(IPCT_DESTROY, ct) < 0) { /* bad luck, let's retry again */ ct->timeout.expires = jiffies + (random32() % net->ct.sysctl_events_retry_timeout); add_timer(&ct->timeout); return; } /* we've got the event delivered, now it's dying */ set_bit(IPS_DYING_BIT, &ct->status); spin_lock(&nf_conntrack_lock); hlist_nulls_del(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); spin_unlock(&nf_conntrack_lock); nf_ct_put(ct); } void nf_ct_insert_dying_list(struct nf_conn *ct) { struct net *net = nf_ct_net(ct); /* add this conntrack to the dying list */ spin_lock_bh(&nf_conntrack_lock); hlist_nulls_add_head(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, &net->ct.dying); spin_unlock_bh(&nf_conntrack_lock); /* set a new timer to retry event delivery */ setup_timer(&ct->timeout, death_by_event, (unsigned long)ct); ct->timeout.expires = jiffies + (random32() % net->ct.sysctl_events_retry_timeout); add_timer(&ct->timeout); } EXPORT_SYMBOL_GPL(nf_ct_insert_dying_list); static void death_by_timeout(unsigned long ul_conntrack) { struct nf_conn *ct = (void *)ul_conntrack; |
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struct nf_conn_tstamp *tstamp; tstamp = nf_conn_tstamp_find(ct); if (tstamp && tstamp->stop == 0) tstamp->stop = ktime_to_ns(ktime_get_real()); |
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if (!test_bit(IPS_DYING_BIT, &ct->status) && unlikely(nf_conntrack_event(IPCT_DESTROY, ct) < 0)) { /* destroy event was not delivered */ nf_ct_delete_from_lists(ct); nf_ct_insert_dying_list(ct); return; } set_bit(IPS_DYING_BIT, &ct->status); nf_ct_delete_from_lists(ct); |
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nf_ct_put(ct); } |
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/* * Warning : * - Caller must take a reference on returned object * and recheck nf_ct_tuple_equal(tuple, &h->tuple) * OR * - Caller must lock nf_conntrack_lock before calling this function */ |
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static struct nf_conntrack_tuple_hash * ____nf_conntrack_find(struct net *net, u16 zone, const struct nf_conntrack_tuple *tuple, u32 hash) |
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{ struct nf_conntrack_tuple_hash *h; |
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struct hlist_nulls_node *n; |
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unsigned int bucket = hash_bucket(hash, net); |
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|
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/* Disable BHs the entire time since we normally need to disable them * at least once for the stats anyway. */ local_bh_disable(); |
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begin: |
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hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[bucket], hnnode) { |
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if (nf_ct_tuple_equal(tuple, &h->tuple) && nf_ct_zone(nf_ct_tuplehash_to_ctrack(h)) == zone) { |
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NF_CT_STAT_INC(net, found); |
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local_bh_enable(); |
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return h; } |
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NF_CT_STAT_INC(net, searched); |
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} |
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/* * if the nulls value we got at the end of this lookup is * not the expected one, we must restart lookup. * We probably met an item that was moved to another chain. */ |
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if (get_nulls_value(n) != bucket) { |
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NF_CT_STAT_INC(net, search_restart); |
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goto begin; |
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} |
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local_bh_enable(); |
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return NULL; } |
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struct nf_conntrack_tuple_hash * __nf_conntrack_find(struct net *net, u16 zone, const struct nf_conntrack_tuple *tuple) { return ____nf_conntrack_find(net, zone, tuple, hash_conntrack_raw(tuple, zone)); } |
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EXPORT_SYMBOL_GPL(__nf_conntrack_find); |
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/* Find a connection corresponding to a tuple. */ |
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static struct nf_conntrack_tuple_hash * __nf_conntrack_find_get(struct net *net, u16 zone, const struct nf_conntrack_tuple *tuple, u32 hash) |
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{ struct nf_conntrack_tuple_hash *h; |
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struct nf_conn *ct; |
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|
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rcu_read_lock(); |
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begin: |
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h = ____nf_conntrack_find(net, zone, tuple, hash); |
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if (h) { ct = nf_ct_tuplehash_to_ctrack(h); |
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if (unlikely(nf_ct_is_dying(ct) || !atomic_inc_not_zero(&ct->ct_general.use))) |
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h = NULL; |
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else { |
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if (unlikely(!nf_ct_tuple_equal(tuple, &h->tuple) || nf_ct_zone(ct) != zone)) { |
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nf_ct_put(ct); goto begin; } } |
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} rcu_read_unlock(); |
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return h; } |
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struct nf_conntrack_tuple_hash * nf_conntrack_find_get(struct net *net, u16 zone, const struct nf_conntrack_tuple *tuple) { return __nf_conntrack_find_get(net, zone, tuple, hash_conntrack_raw(tuple, zone)); } |
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EXPORT_SYMBOL_GPL(nf_conntrack_find_get); |
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|
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static void __nf_conntrack_hash_insert(struct nf_conn *ct, unsigned int hash, |
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unsigned int repl_hash) |
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{ |
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struct net *net = nf_ct_net(ct); |
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hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
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&net->ct.hash[hash]); |
ea781f197 netfilter: nf_con... |
393 |
hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode, |
400dad39d netfilter: netns ... |
394 |
&net->ct.hash[repl_hash]); |
c1d10adb4 [NETFILTER]: Add ... |
395 396 397 398 |
} void nf_conntrack_hash_insert(struct nf_conn *ct) { |
d696c7bda netfilter: nf_con... |
399 |
struct net *net = nf_ct_net(ct); |
c1d10adb4 [NETFILTER]: Add ... |
400 |
unsigned int hash, repl_hash; |
5d0aa2ccd netfilter: nf_con... |
401 |
u16 zone; |
c1d10adb4 [NETFILTER]: Add ... |
402 |
|
5d0aa2ccd netfilter: nf_con... |
403 404 405 |
zone = nf_ct_zone(ct); hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple); repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
c1d10adb4 [NETFILTER]: Add ... |
406 |
|
c1d10adb4 [NETFILTER]: Add ... |
407 |
__nf_conntrack_hash_insert(ct, hash, repl_hash); |
c1d10adb4 [NETFILTER]: Add ... |
408 |
} |
13b183391 [NETFILTER]: nf_c... |
409 |
EXPORT_SYMBOL_GPL(nf_conntrack_hash_insert); |
c1d10adb4 [NETFILTER]: Add ... |
410 |
|
9fb9cbb10 [NETFILTER]: Add ... |
411 412 |
/* Confirm a connection given skb; places it in hash table */ int |
3db05fea5 [NETFILTER]: Repl... |
413 |
__nf_conntrack_confirm(struct sk_buff *skb) |
9fb9cbb10 [NETFILTER]: Add ... |
414 415 |
{ unsigned int hash, repl_hash; |
df0933dcb [NETFILTER]: kill... |
416 |
struct nf_conntrack_tuple_hash *h; |
9fb9cbb10 [NETFILTER]: Add ... |
417 |
struct nf_conn *ct; |
df0933dcb [NETFILTER]: kill... |
418 |
struct nf_conn_help *help; |
a992ca2a0 netfilter: nf_con... |
419 |
struct nf_conn_tstamp *tstamp; |
ea781f197 netfilter: nf_con... |
420 |
struct hlist_nulls_node *n; |
9fb9cbb10 [NETFILTER]: Add ... |
421 |
enum ip_conntrack_info ctinfo; |
400dad39d netfilter: netns ... |
422 |
struct net *net; |
5d0aa2ccd netfilter: nf_con... |
423 |
u16 zone; |
9fb9cbb10 [NETFILTER]: Add ... |
424 |
|
3db05fea5 [NETFILTER]: Repl... |
425 |
ct = nf_ct_get(skb, &ctinfo); |
400dad39d netfilter: netns ... |
426 |
net = nf_ct_net(ct); |
9fb9cbb10 [NETFILTER]: Add ... |
427 428 429 430 431 432 433 |
/* ipt_REJECT uses nf_conntrack_attach to attach related ICMP/TCP RST packets in other direction. Actual packet which created connection will be IP_CT_NEW or for an expected connection, IP_CT_RELATED. */ if (CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) return NF_ACCEPT; |
5d0aa2ccd netfilter: nf_con... |
434 |
zone = nf_ct_zone(ct); |
99f07e91b netfilter: save t... |
435 436 437 438 439 |
/* reuse the hash saved before */ hash = *(unsigned long *)&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev; hash = hash_bucket(hash, net); repl_hash = hash_conntrack(net, zone, &ct->tuplehash[IP_CT_DIR_REPLY].tuple); |
9fb9cbb10 [NETFILTER]: Add ... |
440 441 442 443 444 |
/* We're not in hash table, and we refuse to set up related connections for unconfirmed conns. But packet copies and REJECT will give spurious warnings here. */ /* NF_CT_ASSERT(atomic_read(&ct->ct_general.use) == 1); */ |
25985edce Fix common misspe... |
445 |
/* No external references means no one else could have |
9fb9cbb10 [NETFILTER]: Add ... |
446 447 |
confirmed us. */ NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
0d53778e8 [NETFILTER]: Conv... |
448 449 |
pr_debug("Confirming conntrack %p ", ct); |
9fb9cbb10 [NETFILTER]: Add ... |
450 |
|
f8ba1affa [NETFILTER]: nf_c... |
451 |
spin_lock_bh(&nf_conntrack_lock); |
9fb9cbb10 [NETFILTER]: Add ... |
452 |
|
fc350777c netfilter: nf_con... |
453 454 455 456 457 458 459 460 461 |
/* We have to check the DYING flag inside the lock to prevent a race against nf_ct_get_next_corpse() possibly called from user context, else we insert an already 'dead' hash, blocking further use of that particular connection -JM */ if (unlikely(nf_ct_is_dying(ct))) { spin_unlock_bh(&nf_conntrack_lock); return NF_ACCEPT; } |
9fb9cbb10 [NETFILTER]: Add ... |
462 463 464 |
/* See if there's one in the list already, including reverse: NAT could have grabbed it without realizing, since we're not in the hash. If there is, we lost race. */ |
ea781f197 netfilter: nf_con... |
465 |
hlist_nulls_for_each_entry(h, n, &net->ct.hash[hash], hnnode) |
df0933dcb [NETFILTER]: kill... |
466 |
if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple, |
5d0aa2ccd netfilter: nf_con... |
467 468 |
&h->tuple) && zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
df0933dcb [NETFILTER]: kill... |
469 |
goto out; |
ea781f197 netfilter: nf_con... |
470 |
hlist_nulls_for_each_entry(h, n, &net->ct.hash[repl_hash], hnnode) |
df0933dcb [NETFILTER]: kill... |
471 |
if (nf_ct_tuple_equal(&ct->tuplehash[IP_CT_DIR_REPLY].tuple, |
5d0aa2ccd netfilter: nf_con... |
472 473 |
&h->tuple) && zone == nf_ct_zone(nf_ct_tuplehash_to_ctrack(h))) |
df0933dcb [NETFILTER]: kill... |
474 |
goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
475 |
|
df0933dcb [NETFILTER]: kill... |
476 |
/* Remove from unconfirmed list */ |
ea781f197 netfilter: nf_con... |
477 |
hlist_nulls_del_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode); |
df0933dcb [NETFILTER]: kill... |
478 |
|
df0933dcb [NETFILTER]: kill... |
479 480 481 482 483 484 |
/* Timer relative to confirmation time, not original setting time, otherwise we'd get timer wrap in weird delay cases. */ ct->timeout.expires += jiffies; add_timer(&ct->timeout); atomic_inc(&ct->ct_general.use); |
45eec3419 netfilter: nf_con... |
485 |
ct->status |= IPS_CONFIRMED; |
5c8ec910e netfilter: nf_con... |
486 |
|
a992ca2a0 netfilter: nf_con... |
487 488 489 490 491 492 493 494 |
/* set conntrack timestamp, if enabled. */ tstamp = nf_conn_tstamp_find(ct); if (tstamp) { if (skb->tstamp.tv64 == 0) __net_timestamp((struct sk_buff *)skb); tstamp->start = ktime_to_ns(skb->tstamp); } |
5c8ec910e netfilter: nf_con... |
495 496 497 498 499 500 |
/* Since the lookup is lockless, hash insertion must be done after * starting the timer and setting the CONFIRMED bit. The RCU barriers * guarantee that no other CPU can find the conntrack before the above * stores are visible. */ __nf_conntrack_hash_insert(ct, hash, repl_hash); |
0d55af879 netfilter: netns ... |
501 |
NF_CT_STAT_INC(net, insert); |
f8ba1affa [NETFILTER]: nf_c... |
502 |
spin_unlock_bh(&nf_conntrack_lock); |
5c8ec910e netfilter: nf_con... |
503 |
|
df0933dcb [NETFILTER]: kill... |
504 505 |
help = nfct_help(ct); if (help && help->helper) |
a71996fcc netfilter: netns ... |
506 |
nf_conntrack_event_cache(IPCT_HELPER, ct); |
17e6e4eac netfilter: conntr... |
507 |
|
df0933dcb [NETFILTER]: kill... |
508 |
nf_conntrack_event_cache(master_ct(ct) ? |
a71996fcc netfilter: netns ... |
509 |
IPCT_RELATED : IPCT_NEW, ct); |
df0933dcb [NETFILTER]: kill... |
510 |
return NF_ACCEPT; |
9fb9cbb10 [NETFILTER]: Add ... |
511 |
|
df0933dcb [NETFILTER]: kill... |
512 |
out: |
0d55af879 netfilter: netns ... |
513 |
NF_CT_STAT_INC(net, insert_failed); |
f8ba1affa [NETFILTER]: nf_c... |
514 |
spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb10 [NETFILTER]: Add ... |
515 516 |
return NF_DROP; } |
13b183391 [NETFILTER]: nf_c... |
517 |
EXPORT_SYMBOL_GPL(__nf_conntrack_confirm); |
9fb9cbb10 [NETFILTER]: Add ... |
518 519 520 521 522 523 524 |
/* Returns true if a connection correspondings to the tuple (required for NAT). */ int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, const struct nf_conn *ignored_conntrack) { |
400dad39d netfilter: netns ... |
525 |
struct net *net = nf_ct_net(ignored_conntrack); |
9fb9cbb10 [NETFILTER]: Add ... |
526 |
struct nf_conntrack_tuple_hash *h; |
ea781f197 netfilter: nf_con... |
527 |
struct hlist_nulls_node *n; |
5d0aa2ccd netfilter: nf_con... |
528 529 530 |
struct nf_conn *ct; u16 zone = nf_ct_zone(ignored_conntrack); unsigned int hash = hash_conntrack(net, zone, tuple); |
9fb9cbb10 [NETFILTER]: Add ... |
531 |
|
4e29e9ec7 [NETFILTER]: nf_c... |
532 533 534 535 |
/* Disable BHs the entire time since we need to disable them at * least once for the stats anyway. */ rcu_read_lock_bh(); |
ea781f197 netfilter: nf_con... |
536 |
hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
5d0aa2ccd netfilter: nf_con... |
537 538 539 540 |
ct = nf_ct_tuplehash_to_ctrack(h); if (ct != ignored_conntrack && nf_ct_tuple_equal(tuple, &h->tuple) && nf_ct_zone(ct) == zone) { |
0d55af879 netfilter: netns ... |
541 |
NF_CT_STAT_INC(net, found); |
4e29e9ec7 [NETFILTER]: nf_c... |
542 |
rcu_read_unlock_bh(); |
ba419aff2 [NETFILTER]: nf_c... |
543 544 |
return 1; } |
0d55af879 netfilter: netns ... |
545 |
NF_CT_STAT_INC(net, searched); |
ba419aff2 [NETFILTER]: nf_c... |
546 |
} |
4e29e9ec7 [NETFILTER]: nf_c... |
547 |
rcu_read_unlock_bh(); |
9fb9cbb10 [NETFILTER]: Add ... |
548 |
|
ba419aff2 [NETFILTER]: nf_c... |
549 |
return 0; |
9fb9cbb10 [NETFILTER]: Add ... |
550 |
} |
13b183391 [NETFILTER]: nf_c... |
551 |
EXPORT_SYMBOL_GPL(nf_conntrack_tuple_taken); |
9fb9cbb10 [NETFILTER]: Add ... |
552 |
|
7ae7730fd [NETFILTER]: nf_c... |
553 |
#define NF_CT_EVICTION_RANGE 8 |
9fb9cbb10 [NETFILTER]: Add ... |
554 555 |
/* There's a small race here where we may free a just-assured connection. Too bad: we're in trouble anyway. */ |
400dad39d netfilter: netns ... |
556 |
static noinline int early_drop(struct net *net, unsigned int hash) |
9fb9cbb10 [NETFILTER]: Add ... |
557 |
{ |
f205c5e0c [NETFILTER]: nf_c... |
558 |
/* Use oldest entry, which is roughly LRU */ |
9fb9cbb10 [NETFILTER]: Add ... |
559 |
struct nf_conntrack_tuple_hash *h; |
df0933dcb [NETFILTER]: kill... |
560 |
struct nf_conn *ct = NULL, *tmp; |
ea781f197 netfilter: nf_con... |
561 |
struct hlist_nulls_node *n; |
7ae7730fd [NETFILTER]: nf_c... |
562 |
unsigned int i, cnt = 0; |
9fb9cbb10 [NETFILTER]: Add ... |
563 |
int dropped = 0; |
76507f69c [NETFILTER]: nf_c... |
564 |
rcu_read_lock(); |
d696c7bda netfilter: nf_con... |
565 |
for (i = 0; i < net->ct.htable_size; i++) { |
ea781f197 netfilter: nf_con... |
566 567 |
hlist_nulls_for_each_entry_rcu(h, n, &net->ct.hash[hash], hnnode) { |
7ae7730fd [NETFILTER]: nf_c... |
568 569 570 571 572 |
tmp = nf_ct_tuplehash_to_ctrack(h); if (!test_bit(IPS_ASSURED_BIT, &tmp->status)) ct = tmp; cnt++; } |
76507f69c [NETFILTER]: nf_c... |
573 |
|
5ae27aa2b netfilter: nf_con... |
574 575 576 577 578 579 580 581 582 |
if (ct != NULL) { if (likely(!nf_ct_is_dying(ct) && atomic_inc_not_zero(&ct->ct_general.use))) break; else ct = NULL; } if (cnt >= NF_CT_EVICTION_RANGE) |
7ae7730fd [NETFILTER]: nf_c... |
583 |
break; |
5ae27aa2b netfilter: nf_con... |
584 |
|
d696c7bda netfilter: nf_con... |
585 |
hash = (hash + 1) % net->ct.htable_size; |
9fb9cbb10 [NETFILTER]: Add ... |
586 |
} |
76507f69c [NETFILTER]: nf_c... |
587 |
rcu_read_unlock(); |
9fb9cbb10 [NETFILTER]: Add ... |
588 589 590 591 592 593 594 |
if (!ct) return dropped; if (del_timer(&ct->timeout)) { death_by_timeout((unsigned long)ct); dropped = 1; |
0d55af879 netfilter: netns ... |
595 |
NF_CT_STAT_INC_ATOMIC(net, early_drop); |
9fb9cbb10 [NETFILTER]: Add ... |
596 597 598 599 |
} nf_ct_put(ct); return dropped; } |
f682cefa5 netfilter: fix th... |
600 601 602 603 604 605 606 607 608 609 610 611 612 613 |
void init_nf_conntrack_hash_rnd(void) { unsigned int rand; /* * Why not initialize nf_conntrack_rnd in a "init()" function ? * Because there isn't enough entropy when system initializing, * and we initialize it as late as possible. */ do { get_random_bytes(&rand, sizeof(rand)); } while (!rand); cmpxchg(&nf_conntrack_hash_rnd, 0, rand); } |
99f07e91b netfilter: save t... |
614 615 616 617 618 |
static struct nf_conn * __nf_conntrack_alloc(struct net *net, u16 zone, const struct nf_conntrack_tuple *orig, const struct nf_conntrack_tuple *repl, gfp_t gfp, u32 hash) |
9fb9cbb10 [NETFILTER]: Add ... |
619 |
{ |
cd7fcbf1c netfilter 07/09: ... |
620 |
struct nf_conn *ct; |
9fb9cbb10 [NETFILTER]: Add ... |
621 |
|
b23909695 netfilter: nf_con... |
622 |
if (unlikely(!nf_conntrack_hash_rnd)) { |
f682cefa5 netfilter: fix th... |
623 |
init_nf_conntrack_hash_rnd(); |
99f07e91b netfilter: save t... |
624 625 |
/* recompute the hash as nf_conntrack_hash_rnd is initialized */ hash = hash_conntrack_raw(orig, zone); |
9fb9cbb10 [NETFILTER]: Add ... |
626 |
} |
5251e2d21 [NETFILTER]: conn... |
627 |
/* We don't want any race condition at early drop stage */ |
49ac8713b netfilter: netns ... |
628 |
atomic_inc(&net->ct.count); |
5251e2d21 [NETFILTER]: conn... |
629 |
|
76eb94604 [NETFILTER]: nf_c... |
630 |
if (nf_conntrack_max && |
49ac8713b netfilter: netns ... |
631 |
unlikely(atomic_read(&net->ct.count) > nf_conntrack_max)) { |
99f07e91b netfilter: save t... |
632 |
if (!early_drop(net, hash_bucket(hash, net))) { |
49ac8713b netfilter: netns ... |
633 |
atomic_dec(&net->ct.count); |
9fb9cbb10 [NETFILTER]: Add ... |
634 635 636 637 638 639 640 641 |
if (net_ratelimit()) printk(KERN_WARNING "nf_conntrack: table full, dropping" " packet. "); return ERR_PTR(-ENOMEM); } } |
941297f44 netfilter: nf_con... |
642 643 644 645 |
/* * Do not use kmem_cache_zalloc(), as this cache uses * SLAB_DESTROY_BY_RCU. */ |
5b3501faa netfilter: nf_con... |
646 |
ct = kmem_cache_alloc(net->ct.nf_conntrack_cachep, gfp); |
c88130bcd [NETFILTER]: nf_c... |
647 |
if (ct == NULL) { |
49ac8713b netfilter: netns ... |
648 |
atomic_dec(&net->ct.count); |
dacd2a1a5 [NETFILTER]: nf_c... |
649 |
return ERR_PTR(-ENOMEM); |
9fb9cbb10 [NETFILTER]: Add ... |
650 |
} |
941297f44 netfilter: nf_con... |
651 652 653 654 655 |
/* * Let ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.next * and ct->tuplehash[IP_CT_DIR_REPLY].hnnode.next unchanged. */ memset(&ct->tuplehash[IP_CT_DIR_MAX], 0, |
e5fc9e7a6 netfilter: nf_con... |
656 657 |
offsetof(struct nf_conn, proto) - offsetof(struct nf_conn, tuplehash[IP_CT_DIR_MAX])); |
440f0d588 netfilter: nf_con... |
658 |
spin_lock_init(&ct->lock); |
c88130bcd [NETFILTER]: nf_c... |
659 |
ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple = *orig; |
941297f44 netfilter: nf_con... |
660 |
ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode.pprev = NULL; |
c88130bcd [NETFILTER]: nf_c... |
661 |
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *repl; |
99f07e91b netfilter: save t... |
662 663 |
/* save hash for reusing when confirming */ *(unsigned long *)(&ct->tuplehash[IP_CT_DIR_REPLY].hnnode.pprev) = hash; |
9fb9cbb10 [NETFILTER]: Add ... |
664 |
/* Don't set timer yet: wait for confirmation */ |
c88130bcd [NETFILTER]: nf_c... |
665 |
setup_timer(&ct->timeout, death_by_timeout, (unsigned long)ct); |
c2d9ba9bc net: CONFIG_NET_N... |
666 |
write_pnet(&ct->ct_net, net); |
5d0aa2ccd netfilter: nf_con... |
667 668 669 670 671 672 673 674 675 676 |
#ifdef CONFIG_NF_CONNTRACK_ZONES if (zone) { struct nf_conntrack_zone *nf_ct_zone; nf_ct_zone = nf_ct_ext_add(ct, NF_CT_EXT_ZONE, GFP_ATOMIC); if (!nf_ct_zone) goto out_free; nf_ct_zone->id = zone; } #endif |
941297f44 netfilter: nf_con... |
677 678 679 680 681 |
/* * changes to lookup keys must be done before setting refcnt to 1 */ smp_wmb(); atomic_set(&ct->ct_general.use, 1); |
c88130bcd [NETFILTER]: nf_c... |
682 |
return ct; |
5d0aa2ccd netfilter: nf_con... |
683 684 685 686 687 688 |
#ifdef CONFIG_NF_CONNTRACK_ZONES out_free: kmem_cache_free(net->ct.nf_conntrack_cachep, ct); return ERR_PTR(-ENOMEM); #endif |
9fb9cbb10 [NETFILTER]: Add ... |
689 |
} |
99f07e91b netfilter: save t... |
690 691 692 693 694 695 696 697 |
struct nf_conn *nf_conntrack_alloc(struct net *net, u16 zone, const struct nf_conntrack_tuple *orig, const struct nf_conntrack_tuple *repl, gfp_t gfp) { return __nf_conntrack_alloc(net, zone, orig, repl, gfp, 0); } |
13b183391 [NETFILTER]: nf_c... |
698 |
EXPORT_SYMBOL_GPL(nf_conntrack_alloc); |
9fb9cbb10 [NETFILTER]: Add ... |
699 |
|
c88130bcd [NETFILTER]: nf_c... |
700 |
void nf_conntrack_free(struct nf_conn *ct) |
76507f69c [NETFILTER]: nf_c... |
701 |
{ |
1d45209d8 netfilter: nf_con... |
702 |
struct net *net = nf_ct_net(ct); |
ceeff7541 netfilter: nf_con... |
703 |
nf_ct_ext_destroy(ct); |
1d45209d8 netfilter: nf_con... |
704 |
atomic_dec(&net->ct.count); |
ea781f197 netfilter: nf_con... |
705 |
nf_ct_ext_free(ct); |
5b3501faa netfilter: nf_con... |
706 |
kmem_cache_free(net->ct.nf_conntrack_cachep, ct); |
76507f69c [NETFILTER]: nf_c... |
707 |
} |
13b183391 [NETFILTER]: nf_c... |
708 |
EXPORT_SYMBOL_GPL(nf_conntrack_free); |
9fb9cbb10 [NETFILTER]: Add ... |
709 710 711 712 |
/* Allocate a new conntrack: we return -ENOMEM if classification failed due to stress. Otherwise it really is unclassifiable. */ static struct nf_conntrack_tuple_hash * |
b2a15a604 netfilter: nf_con... |
713 |
init_conntrack(struct net *net, struct nf_conn *tmpl, |
5a1fb391d netfilter: netns ... |
714 |
const struct nf_conntrack_tuple *tuple, |
9fb9cbb10 [NETFILTER]: Add ... |
715 |
struct nf_conntrack_l3proto *l3proto, |
605dcad6c [NETFILTER]: nf_c... |
716 |
struct nf_conntrack_l4proto *l4proto, |
9fb9cbb10 [NETFILTER]: Add ... |
717 |
struct sk_buff *skb, |
99f07e91b netfilter: save t... |
718 |
unsigned int dataoff, u32 hash) |
9fb9cbb10 [NETFILTER]: Add ... |
719 |
{ |
c88130bcd [NETFILTER]: nf_c... |
720 |
struct nf_conn *ct; |
3c158f7f5 [NETFILTER]: nf_c... |
721 |
struct nf_conn_help *help; |
9fb9cbb10 [NETFILTER]: Add ... |
722 |
struct nf_conntrack_tuple repl_tuple; |
b2a15a604 netfilter: nf_con... |
723 |
struct nf_conntrack_ecache *ecache; |
9fb9cbb10 [NETFILTER]: Add ... |
724 |
struct nf_conntrack_expect *exp; |
5d0aa2ccd netfilter: nf_con... |
725 |
u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
9fb9cbb10 [NETFILTER]: Add ... |
726 |
|
605dcad6c [NETFILTER]: nf_c... |
727 |
if (!nf_ct_invert_tuple(&repl_tuple, tuple, l3proto, l4proto)) { |
0d53778e8 [NETFILTER]: Conv... |
728 729 |
pr_debug("Can't invert tuple. "); |
9fb9cbb10 [NETFILTER]: Add ... |
730 731 |
return NULL; } |
99f07e91b netfilter: save t... |
732 733 |
ct = __nf_conntrack_alloc(net, zone, tuple, &repl_tuple, GFP_ATOMIC, hash); |
0a9ee8134 netfilter: Remove... |
734 |
if (IS_ERR(ct)) |
c88130bcd [NETFILTER]: nf_c... |
735 |
return (struct nf_conntrack_tuple_hash *)ct; |
9fb9cbb10 [NETFILTER]: Add ... |
736 |
|
c88130bcd [NETFILTER]: nf_c... |
737 738 |
if (!l4proto->new(ct, skb, dataoff)) { nf_conntrack_free(ct); |
0d53778e8 [NETFILTER]: Conv... |
739 740 |
pr_debug("init conntrack: can't track with proto module "); |
9fb9cbb10 [NETFILTER]: Add ... |
741 742 |
return NULL; } |
584015727 netfilter: accoun... |
743 |
nf_ct_acct_ext_add(ct, GFP_ATOMIC); |
a992ca2a0 netfilter: nf_con... |
744 |
nf_ct_tstamp_ext_add(ct, GFP_ATOMIC); |
b2a15a604 netfilter: nf_con... |
745 746 747 748 749 |
ecache = tmpl ? nf_ct_ecache_find(tmpl) : NULL; nf_ct_ecache_ext_add(ct, ecache ? ecache->ctmask : 0, ecache ? ecache->expmask : 0, GFP_ATOMIC); |
584015727 netfilter: accoun... |
750 |
|
f8ba1affa [NETFILTER]: nf_c... |
751 |
spin_lock_bh(&nf_conntrack_lock); |
5d0aa2ccd netfilter: nf_con... |
752 |
exp = nf_ct_find_expectation(net, zone, tuple); |
9fb9cbb10 [NETFILTER]: Add ... |
753 |
if (exp) { |
0d53778e8 [NETFILTER]: Conv... |
754 755 |
pr_debug("conntrack: expectation arrives ct=%p exp=%p ", |
c88130bcd [NETFILTER]: nf_c... |
756 |
ct, exp); |
9fb9cbb10 [NETFILTER]: Add ... |
757 |
/* Welcome, Mr. Bond. We've been expecting you... */ |
c88130bcd [NETFILTER]: nf_c... |
758 759 |
__set_bit(IPS_EXPECTED_BIT, &ct->status); ct->master = exp->master; |
ceceae1b1 [NETFILTER]: nf_c... |
760 |
if (exp->helper) { |
c88130bcd [NETFILTER]: nf_c... |
761 |
help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
ceceae1b1 [NETFILTER]: nf_c... |
762 |
if (help) |
cf778b00e net: reintroduce ... |
763 |
rcu_assign_pointer(help->helper, exp->helper); |
ceceae1b1 [NETFILTER]: nf_c... |
764 |
} |
9fb9cbb10 [NETFILTER]: Add ... |
765 |
#ifdef CONFIG_NF_CONNTRACK_MARK |
c88130bcd [NETFILTER]: nf_c... |
766 |
ct->mark = exp->master->mark; |
9fb9cbb10 [NETFILTER]: Add ... |
767 |
#endif |
7c9728c39 [SECMARK]: Add se... |
768 |
#ifdef CONFIG_NF_CONNTRACK_SECMARK |
c88130bcd [NETFILTER]: nf_c... |
769 |
ct->secmark = exp->master->secmark; |
7c9728c39 [SECMARK]: Add se... |
770 |
#endif |
c88130bcd [NETFILTER]: nf_c... |
771 |
nf_conntrack_get(&ct->master->ct_general); |
0d55af879 netfilter: netns ... |
772 |
NF_CT_STAT_INC(net, expect_new); |
22e7410b7 [NETFILTER]: nf_c... |
773 |
} else { |
b2a15a604 netfilter: nf_con... |
774 |
__nf_ct_try_assign_helper(ct, tmpl, GFP_ATOMIC); |
0d55af879 netfilter: netns ... |
775 |
NF_CT_STAT_INC(net, new); |
22e7410b7 [NETFILTER]: nf_c... |
776 |
} |
9fb9cbb10 [NETFILTER]: Add ... |
777 778 |
/* Overload tuple linked list to put us in unconfirmed list. */ |
ea781f197 netfilter: nf_con... |
779 |
hlist_nulls_add_head_rcu(&ct->tuplehash[IP_CT_DIR_ORIGINAL].hnnode, |
63c9a2626 netfilter: netns ... |
780 |
&net->ct.unconfirmed); |
9fb9cbb10 [NETFILTER]: Add ... |
781 |
|
f8ba1affa [NETFILTER]: nf_c... |
782 |
spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb10 [NETFILTER]: Add ... |
783 784 785 |
if (exp) { if (exp->expectfn) |
c88130bcd [NETFILTER]: nf_c... |
786 |
exp->expectfn(ct, exp); |
6823645d6 [NETFILTER]: nf_c... |
787 |
nf_ct_expect_put(exp); |
9fb9cbb10 [NETFILTER]: Add ... |
788 |
} |
c88130bcd [NETFILTER]: nf_c... |
789 |
return &ct->tuplehash[IP_CT_DIR_ORIGINAL]; |
9fb9cbb10 [NETFILTER]: Add ... |
790 791 792 793 |
} /* On success, returns conntrack ptr, sets skb->nfct and ctinfo */ static inline struct nf_conn * |
b2a15a604 netfilter: nf_con... |
794 |
resolve_normal_ct(struct net *net, struct nf_conn *tmpl, |
a702a65fc netfilter: netns ... |
795 |
struct sk_buff *skb, |
9fb9cbb10 [NETFILTER]: Add ... |
796 797 798 799 |
unsigned int dataoff, u_int16_t l3num, u_int8_t protonum, struct nf_conntrack_l3proto *l3proto, |
605dcad6c [NETFILTER]: nf_c... |
800 |
struct nf_conntrack_l4proto *l4proto, |
9fb9cbb10 [NETFILTER]: Add ... |
801 802 803 804 805 806 |
int *set_reply, enum ip_conntrack_info *ctinfo) { struct nf_conntrack_tuple tuple; struct nf_conntrack_tuple_hash *h; struct nf_conn *ct; |
5d0aa2ccd netfilter: nf_con... |
807 |
u16 zone = tmpl ? nf_ct_zone(tmpl) : NF_CT_DEFAULT_ZONE; |
99f07e91b netfilter: save t... |
808 |
u32 hash; |
9fb9cbb10 [NETFILTER]: Add ... |
809 |
|
bbe735e42 [SK_BUFF]: Introd... |
810 |
if (!nf_ct_get_tuple(skb, skb_network_offset(skb), |
9fb9cbb10 [NETFILTER]: Add ... |
811 |
dataoff, l3num, protonum, &tuple, l3proto, |
605dcad6c [NETFILTER]: nf_c... |
812 |
l4proto)) { |
0d53778e8 [NETFILTER]: Conv... |
813 814 |
pr_debug("resolve_normal_ct: Can't get tuple "); |
9fb9cbb10 [NETFILTER]: Add ... |
815 816 817 818 |
return NULL; } /* look for tuple match */ |
99f07e91b netfilter: save t... |
819 820 |
hash = hash_conntrack_raw(&tuple, zone); h = __nf_conntrack_find_get(net, zone, &tuple, hash); |
9fb9cbb10 [NETFILTER]: Add ... |
821 |
if (!h) { |
b2a15a604 netfilter: nf_con... |
822 |
h = init_conntrack(net, tmpl, &tuple, l3proto, l4proto, |
99f07e91b netfilter: save t... |
823 |
skb, dataoff, hash); |
9fb9cbb10 [NETFILTER]: Add ... |
824 825 826 827 828 829 830 831 832 |
if (!h) return NULL; if (IS_ERR(h)) return (void *)h; } ct = nf_ct_tuplehash_to_ctrack(h); /* It exists; we have (non-exclusive) reference. */ if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY) { |
fb0488337 netfilter: add mo... |
833 |
*ctinfo = IP_CT_ESTABLISHED_REPLY; |
9fb9cbb10 [NETFILTER]: Add ... |
834 835 836 837 838 |
/* Please set reply bit if this packet OK */ *set_reply = 1; } else { /* Once we've had two way comms, always ESTABLISHED. */ if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) { |
0d53778e8 [NETFILTER]: Conv... |
839 840 |
pr_debug("nf_conntrack_in: normal packet for %p ", ct); |
9fb9cbb10 [NETFILTER]: Add ... |
841 842 |
*ctinfo = IP_CT_ESTABLISHED; } else if (test_bit(IPS_EXPECTED_BIT, &ct->status)) { |
0d53778e8 [NETFILTER]: Conv... |
843 844 845 |
pr_debug("nf_conntrack_in: related packet for %p ", ct); |
9fb9cbb10 [NETFILTER]: Add ... |
846 847 |
*ctinfo = IP_CT_RELATED; } else { |
0d53778e8 [NETFILTER]: Conv... |
848 849 |
pr_debug("nf_conntrack_in: new packet for %p ", ct); |
9fb9cbb10 [NETFILTER]: Add ... |
850 851 852 853 854 855 856 857 858 859 |
*ctinfo = IP_CT_NEW; } *set_reply = 0; } skb->nfct = &ct->ct_general; skb->nfctinfo = *ctinfo; return ct; } unsigned int |
a702a65fc netfilter: netns ... |
860 861 |
nf_conntrack_in(struct net *net, u_int8_t pf, unsigned int hooknum, struct sk_buff *skb) |
9fb9cbb10 [NETFILTER]: Add ... |
862 |
{ |
b2a15a604 netfilter: nf_con... |
863 |
struct nf_conn *ct, *tmpl = NULL; |
9fb9cbb10 [NETFILTER]: Add ... |
864 865 |
enum ip_conntrack_info ctinfo; struct nf_conntrack_l3proto *l3proto; |
605dcad6c [NETFILTER]: nf_c... |
866 |
struct nf_conntrack_l4proto *l4proto; |
9fb9cbb10 [NETFILTER]: Add ... |
867 868 869 870 |
unsigned int dataoff; u_int8_t protonum; int set_reply = 0; int ret; |
3db05fea5 [NETFILTER]: Repl... |
871 |
if (skb->nfct) { |
b2a15a604 netfilter: nf_con... |
872 873 874 875 876 877 878 |
/* Previously seen (loopback or untracked)? Ignore. */ tmpl = (struct nf_conn *)skb->nfct; if (!nf_ct_is_template(tmpl)) { NF_CT_STAT_INC_ATOMIC(net, ignore); return NF_ACCEPT; } skb->nfct = NULL; |
9fb9cbb10 [NETFILTER]: Add ... |
879 |
} |
923f4902f [NETFILTER]: nf_c... |
880 |
/* rcu_read_lock()ed by nf_hook_slow */ |
76108cea0 netfilter: Use un... |
881 |
l3proto = __nf_ct_l3proto_find(pf); |
3db05fea5 [NETFILTER]: Repl... |
882 |
ret = l3proto->get_l4proto(skb, skb_network_offset(skb), |
ffc306904 [NETFILTER]: nf_c... |
883 884 |
&dataoff, &protonum); if (ret <= 0) { |
25985edce Fix common misspe... |
885 886 |
pr_debug("not prepared to track yet or error occurred "); |
0d55af879 netfilter: netns ... |
887 888 |
NF_CT_STAT_INC_ATOMIC(net, error); NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a604 netfilter: nf_con... |
889 890 |
ret = -ret; goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
891 |
} |
76108cea0 netfilter: Use un... |
892 |
l4proto = __nf_ct_l4proto_find(pf, protonum); |
9fb9cbb10 [NETFILTER]: Add ... |
893 894 895 896 |
/* It may be an special packet, error, unclean... * inverse of the return code tells to the netfilter * core what to do with the packet. */ |
74c51a149 netfilter: netns ... |
897 |
if (l4proto->error != NULL) { |
8fea97ec1 netfilter: nf_con... |
898 899 |
ret = l4proto->error(net, tmpl, skb, dataoff, &ctinfo, pf, hooknum); |
74c51a149 netfilter: netns ... |
900 |
if (ret <= 0) { |
0d55af879 netfilter: netns ... |
901 902 |
NF_CT_STAT_INC_ATOMIC(net, error); NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a604 netfilter: nf_con... |
903 904 |
ret = -ret; goto out; |
74c51a149 netfilter: netns ... |
905 |
} |
88ed01d17 netfilter: nf_con... |
906 907 908 |
/* ICMP[v6] protocol trackers may assign one conntrack. */ if (skb->nfct) goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
909 |
} |
b2a15a604 netfilter: nf_con... |
910 |
ct = resolve_normal_ct(net, tmpl, skb, dataoff, pf, protonum, |
a702a65fc netfilter: netns ... |
911 |
l3proto, l4proto, &set_reply, &ctinfo); |
9fb9cbb10 [NETFILTER]: Add ... |
912 913 |
if (!ct) { /* Not valid part of a connection */ |
0d55af879 netfilter: netns ... |
914 |
NF_CT_STAT_INC_ATOMIC(net, invalid); |
b2a15a604 netfilter: nf_con... |
915 916 |
ret = NF_ACCEPT; goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
917 918 919 920 |
} if (IS_ERR(ct)) { /* Too stressed to deal. */ |
0d55af879 netfilter: netns ... |
921 |
NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a604 netfilter: nf_con... |
922 923 |
ret = NF_DROP; goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
924 |
} |
3db05fea5 [NETFILTER]: Repl... |
925 |
NF_CT_ASSERT(skb->nfct); |
9fb9cbb10 [NETFILTER]: Add ... |
926 |
|
3db05fea5 [NETFILTER]: Repl... |
927 |
ret = l4proto->packet(ct, skb, dataoff, ctinfo, pf, hooknum); |
ec8d54096 netfilter: conntr... |
928 |
if (ret <= 0) { |
9fb9cbb10 [NETFILTER]: Add ... |
929 930 |
/* Invalid: inverse of the return code tells * the netfilter core what to do */ |
0d53778e8 [NETFILTER]: Conv... |
931 932 |
pr_debug("nf_conntrack_in: Can't track with proto module "); |
3db05fea5 [NETFILTER]: Repl... |
933 934 |
nf_conntrack_put(skb->nfct); skb->nfct = NULL; |
0d55af879 netfilter: netns ... |
935 |
NF_CT_STAT_INC_ATOMIC(net, invalid); |
7d1e04598 netfilter: nf_con... |
936 937 |
if (ret == -NF_DROP) NF_CT_STAT_INC_ATOMIC(net, drop); |
b2a15a604 netfilter: nf_con... |
938 939 |
ret = -ret; goto out; |
9fb9cbb10 [NETFILTER]: Add ... |
940 941 942 |
} if (set_reply && !test_and_set_bit(IPS_SEEN_REPLY_BIT, &ct->status)) |
858b31330 netfilter: nf_con... |
943 |
nf_conntrack_event_cache(IPCT_REPLY, ct); |
b2a15a604 netfilter: nf_con... |
944 |
out: |
c31742864 netfilter: nf_con... |
945 946 947 948 949 950 951 952 953 |
if (tmpl) { /* Special case: we have to repeat this hook, assign the * template again to this packet. We assume that this packet * has no conntrack assigned. This is used by nf_ct_tcp. */ if (ret == NF_REPEAT) skb->nfct = (struct nf_conntrack *)tmpl; else nf_ct_put(tmpl); } |
9fb9cbb10 [NETFILTER]: Add ... |
954 955 956 |
return ret; } |
13b183391 [NETFILTER]: nf_c... |
957 |
EXPORT_SYMBOL_GPL(nf_conntrack_in); |
9fb9cbb10 [NETFILTER]: Add ... |
958 |
|
5f2b4c900 [NETFILTER]: nf_c... |
959 960 |
bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, const struct nf_conntrack_tuple *orig) |
9fb9cbb10 [NETFILTER]: Add ... |
961 |
{ |
5f2b4c900 [NETFILTER]: nf_c... |
962 |
bool ret; |
923f4902f [NETFILTER]: nf_c... |
963 964 965 966 967 968 969 970 |
rcu_read_lock(); ret = nf_ct_invert_tuple(inverse, orig, __nf_ct_l3proto_find(orig->src.l3num), __nf_ct_l4proto_find(orig->src.l3num, orig->dst.protonum)); rcu_read_unlock(); return ret; |
9fb9cbb10 [NETFILTER]: Add ... |
971 |
} |
13b183391 [NETFILTER]: nf_c... |
972 |
EXPORT_SYMBOL_GPL(nf_ct_invert_tuplepr); |
9fb9cbb10 [NETFILTER]: Add ... |
973 |
|
5b1158e90 [NETFILTER]: Add ... |
974 975 976 977 978 979 |
/* Alter reply tuple (maybe alter helper). This is for NAT, and is implicitly racy: see __nf_conntrack_confirm */ void nf_conntrack_alter_reply(struct nf_conn *ct, const struct nf_conntrack_tuple *newreply) { struct nf_conn_help *help = nfct_help(ct); |
5b1158e90 [NETFILTER]: Add ... |
980 981 |
/* Should be unconfirmed, so not in hash table yet */ NF_CT_ASSERT(!nf_ct_is_confirmed(ct)); |
0d53778e8 [NETFILTER]: Conv... |
982 |
pr_debug("Altering reply tuple of %p to ", ct); |
3c9fba656 [NETFILTER]: nf_c... |
983 |
nf_ct_dump_tuple(newreply); |
5b1158e90 [NETFILTER]: Add ... |
984 985 |
ct->tuplehash[IP_CT_DIR_REPLY].tuple = *newreply; |
ef1a5a50b [NETFILTER]: nf_c... |
986 |
if (ct->master || (help && !hlist_empty(&help->expectations))) |
c52fbb410 [NETFILTER]: nf_c... |
987 |
return; |
ceceae1b1 [NETFILTER]: nf_c... |
988 |
|
c52fbb410 [NETFILTER]: nf_c... |
989 |
rcu_read_lock(); |
b2a15a604 netfilter: nf_con... |
990 |
__nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC); |
c52fbb410 [NETFILTER]: nf_c... |
991 |
rcu_read_unlock(); |
5b1158e90 [NETFILTER]: Add ... |
992 |
} |
13b183391 [NETFILTER]: nf_c... |
993 |
EXPORT_SYMBOL_GPL(nf_conntrack_alter_reply); |
5b1158e90 [NETFILTER]: Add ... |
994 |
|
9fb9cbb10 [NETFILTER]: Add ... |
995 996 997 998 999 1000 1001 |
/* Refresh conntrack for this many jiffies and do accounting if do_acct is 1 */ void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, const struct sk_buff *skb, unsigned long extra_jiffies, int do_acct) { |
9fb9cbb10 [NETFILTER]: Add ... |
1002 1003 |
NF_CT_ASSERT(ct->timeout.data == (unsigned long)ct); NF_CT_ASSERT(skb); |
997ae831a [NETFILTER]: conn... |
1004 |
/* Only update if this is not a fixed timeout */ |
47d950454 [NETFILTER]: nf_c... |
1005 1006 |
if (test_bit(IPS_FIXED_TIMEOUT_BIT, &ct->status)) goto acct; |
997ae831a [NETFILTER]: conn... |
1007 |
|
9fb9cbb10 [NETFILTER]: Add ... |
1008 1009 1010 |
/* If not in hash table, timer will not be active yet */ if (!nf_ct_is_confirmed(ct)) { ct->timeout.expires = extra_jiffies; |
9fb9cbb10 [NETFILTER]: Add ... |
1011 |
} else { |
be00c8e48 [NETFILTER]: nf_c... |
1012 1013 1014 1015 1016 |
unsigned long newtime = jiffies + extra_jiffies; /* Only update the timeout if the new timeout is at least HZ jiffies from the old timeout. Need del_timer for race avoidance (may already be dying). */ |
65cb9fda3 netfilter: nf_con... |
1017 1018 |
if (newtime - ct->timeout.expires >= HZ) mod_timer_pending(&ct->timeout, newtime); |
9fb9cbb10 [NETFILTER]: Add ... |
1019 |
} |
47d950454 [NETFILTER]: nf_c... |
1020 |
acct: |
9fb9cbb10 [NETFILTER]: Add ... |
1021 |
if (do_acct) { |
584015727 netfilter: accoun... |
1022 |
struct nf_conn_counter *acct; |
3ffd5eeb1 [NETFILTER]: nf_c... |
1023 |
|
584015727 netfilter: accoun... |
1024 1025 |
acct = nf_conn_acct_find(ct); if (acct) { |
b3e0bfa71 netfilter: nf_con... |
1026 1027 |
atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); atomic64_add(skb->len, &acct[CTINFO2DIR(ctinfo)].bytes); |
584015727 netfilter: accoun... |
1028 |
} |
9fb9cbb10 [NETFILTER]: Add ... |
1029 |
} |
9fb9cbb10 [NETFILTER]: Add ... |
1030 |
} |
13b183391 [NETFILTER]: nf_c... |
1031 |
EXPORT_SYMBOL_GPL(__nf_ct_refresh_acct); |
9fb9cbb10 [NETFILTER]: Add ... |
1032 |
|
4c8894980 netfilter: Let nf... |
1033 1034 1035 1036 |
bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, const struct sk_buff *skb, int do_acct) |
51091764f netfilter: nf_con... |
1037 |
{ |
718d4ad98 netfilter: nf_con... |
1038 |
if (do_acct) { |
584015727 netfilter: accoun... |
1039 |
struct nf_conn_counter *acct; |
584015727 netfilter: accoun... |
1040 1041 |
acct = nf_conn_acct_find(ct); if (acct) { |
b3e0bfa71 netfilter: nf_con... |
1042 1043 1044 |
atomic64_inc(&acct[CTINFO2DIR(ctinfo)].packets); atomic64_add(skb->len - skb_network_offset(skb), &acct[CTINFO2DIR(ctinfo)].bytes); |
584015727 netfilter: accoun... |
1045 |
} |
718d4ad98 netfilter: nf_con... |
1046 |
} |
584015727 netfilter: accoun... |
1047 |
|
4c8894980 netfilter: Let nf... |
1048 |
if (del_timer(&ct->timeout)) { |
51091764f netfilter: nf_con... |
1049 |
ct->timeout.function((unsigned long)ct); |
4c8894980 netfilter: Let nf... |
1050 1051 1052 |
return true; } return false; |
51091764f netfilter: nf_con... |
1053 |
} |
718d4ad98 netfilter: nf_con... |
1054 |
EXPORT_SYMBOL_GPL(__nf_ct_kill_acct); |
51091764f netfilter: nf_con... |
1055 |
|
5d0aa2ccd netfilter: nf_con... |
1056 1057 1058 1059 1060 1061 1062 |
#ifdef CONFIG_NF_CONNTRACK_ZONES static struct nf_ct_ext_type nf_ct_zone_extend __read_mostly = { .len = sizeof(struct nf_conntrack_zone), .align = __alignof__(struct nf_conntrack_zone), .id = NF_CT_EXT_ZONE, }; #endif |
c0cd11566 net:netfilter: us... |
1063 |
#if IS_ENABLED(CONFIG_NF_CT_NETLINK) |
c1d10adb4 [NETFILTER]: Add ... |
1064 1065 1066 |
#include <linux/netfilter/nfnetlink.h> #include <linux/netfilter/nfnetlink_conntrack.h> |
57b47a53e [NET]: sem2mutex ... |
1067 |
#include <linux/mutex.h> |
c1d10adb4 [NETFILTER]: Add ... |
1068 1069 1070 |
/* Generic function for tcp/udp/sctp/dccp and alike. This needs to be * in ip_conntrack_core, since we don't want the protocols to autoload * or depend on ctnetlink */ |
fdf708322 [NETFILTER]: nfne... |
1071 |
int nf_ct_port_tuple_to_nlattr(struct sk_buff *skb, |
c1d10adb4 [NETFILTER]: Add ... |
1072 1073 |
const struct nf_conntrack_tuple *tuple) { |
77236b6e3 [NETFILTER]: ctne... |
1074 1075 |
NLA_PUT_BE16(skb, CTA_PROTO_SRC_PORT, tuple->src.u.tcp.port); NLA_PUT_BE16(skb, CTA_PROTO_DST_PORT, tuple->dst.u.tcp.port); |
c1d10adb4 [NETFILTER]: Add ... |
1076 |
return 0; |
df6fb868d [NETFILTER]: nfne... |
1077 |
nla_put_failure: |
c1d10adb4 [NETFILTER]: Add ... |
1078 1079 |
return -1; } |
fdf708322 [NETFILTER]: nfne... |
1080 |
EXPORT_SYMBOL_GPL(nf_ct_port_tuple_to_nlattr); |
c1d10adb4 [NETFILTER]: Add ... |
1081 |
|
f73e924cd [NETFILTER]: ctne... |
1082 1083 1084 |
const struct nla_policy nf_ct_port_nla_policy[CTA_PROTO_MAX+1] = { [CTA_PROTO_SRC_PORT] = { .type = NLA_U16 }, [CTA_PROTO_DST_PORT] = { .type = NLA_U16 }, |
c1d10adb4 [NETFILTER]: Add ... |
1085 |
}; |
f73e924cd [NETFILTER]: ctne... |
1086 |
EXPORT_SYMBOL_GPL(nf_ct_port_nla_policy); |
c1d10adb4 [NETFILTER]: Add ... |
1087 |
|
fdf708322 [NETFILTER]: nfne... |
1088 |
int nf_ct_port_nlattr_to_tuple(struct nlattr *tb[], |
c1d10adb4 [NETFILTER]: Add ... |
1089 1090 |
struct nf_conntrack_tuple *t) { |
df6fb868d [NETFILTER]: nfne... |
1091 |
if (!tb[CTA_PROTO_SRC_PORT] || !tb[CTA_PROTO_DST_PORT]) |
c1d10adb4 [NETFILTER]: Add ... |
1092 |
return -EINVAL; |
77236b6e3 [NETFILTER]: ctne... |
1093 1094 |
t->src.u.tcp.port = nla_get_be16(tb[CTA_PROTO_SRC_PORT]); t->dst.u.tcp.port = nla_get_be16(tb[CTA_PROTO_DST_PORT]); |
c1d10adb4 [NETFILTER]: Add ... |
1095 1096 1097 |
return 0; } |
fdf708322 [NETFILTER]: nfne... |
1098 |
EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_to_tuple); |
5c0de29d0 netfilter: nf_con... |
1099 1100 1101 1102 1103 1104 |
int nf_ct_port_nlattr_tuple_size(void) { return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1); } EXPORT_SYMBOL_GPL(nf_ct_port_nlattr_tuple_size); |
c1d10adb4 [NETFILTER]: Add ... |
1105 |
#endif |
9fb9cbb10 [NETFILTER]: Add ... |
1106 |
/* Used by ipt_REJECT and ip6t_REJECT. */ |
b334aadc3 [NETFILTER]: nf_c... |
1107 |
static void nf_conntrack_attach(struct sk_buff *nskb, struct sk_buff *skb) |
9fb9cbb10 [NETFILTER]: Add ... |
1108 1109 1110 1111 1112 1113 1114 |
{ struct nf_conn *ct; enum ip_conntrack_info ctinfo; /* This ICMP is in reverse direction to the packet which caused it */ ct = nf_ct_get(skb, &ctinfo); if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) |
fb0488337 netfilter: add mo... |
1115 |
ctinfo = IP_CT_RELATED_REPLY; |
9fb9cbb10 [NETFILTER]: Add ... |
1116 1117 1118 1119 1120 1121 1122 1123 |
else ctinfo = IP_CT_RELATED; /* Attach to new skbuff, and increment count */ nskb->nfct = &ct->ct_general; nskb->nfctinfo = ctinfo; nf_conntrack_get(nskb->nfct); } |
9fb9cbb10 [NETFILTER]: Add ... |
1124 |
/* Bring out ya dead! */ |
df0933dcb [NETFILTER]: kill... |
1125 |
static struct nf_conn * |
400dad39d netfilter: netns ... |
1126 |
get_next_corpse(struct net *net, int (*iter)(struct nf_conn *i, void *data), |
9fb9cbb10 [NETFILTER]: Add ... |
1127 1128 |
void *data, unsigned int *bucket) { |
df0933dcb [NETFILTER]: kill... |
1129 1130 |
struct nf_conntrack_tuple_hash *h; struct nf_conn *ct; |
ea781f197 netfilter: nf_con... |
1131 |
struct hlist_nulls_node *n; |
9fb9cbb10 [NETFILTER]: Add ... |
1132 |
|
f8ba1affa [NETFILTER]: nf_c... |
1133 |
spin_lock_bh(&nf_conntrack_lock); |
d696c7bda netfilter: nf_con... |
1134 |
for (; *bucket < net->ct.htable_size; (*bucket)++) { |
ea781f197 netfilter: nf_con... |
1135 |
hlist_nulls_for_each_entry(h, n, &net->ct.hash[*bucket], hnnode) { |
df0933dcb [NETFILTER]: kill... |
1136 1137 1138 1139 |
ct = nf_ct_tuplehash_to_ctrack(h); if (iter(ct, data)) goto found; } |
601e68e10 [NETFILTER]: Fix ... |
1140 |
} |
ea781f197 netfilter: nf_con... |
1141 |
hlist_nulls_for_each_entry(h, n, &net->ct.unconfirmed, hnnode) { |
df0933dcb [NETFILTER]: kill... |
1142 1143 |
ct = nf_ct_tuplehash_to_ctrack(h); if (iter(ct, data)) |
ec68e97de [NETFILTER]: conn... |
1144 |
set_bit(IPS_DYING_BIT, &ct->status); |
df0933dcb [NETFILTER]: kill... |
1145 |
} |
f8ba1affa [NETFILTER]: nf_c... |
1146 |
spin_unlock_bh(&nf_conntrack_lock); |
df0933dcb [NETFILTER]: kill... |
1147 1148 |
return NULL; found: |
c073e3fa8 [NETFILTER]: nf_c... |
1149 |
atomic_inc(&ct->ct_general.use); |
f8ba1affa [NETFILTER]: nf_c... |
1150 |
spin_unlock_bh(&nf_conntrack_lock); |
df0933dcb [NETFILTER]: kill... |
1151 |
return ct; |
9fb9cbb10 [NETFILTER]: Add ... |
1152 |
} |
400dad39d netfilter: netns ... |
1153 1154 1155 |
void nf_ct_iterate_cleanup(struct net *net, int (*iter)(struct nf_conn *i, void *data), void *data) |
9fb9cbb10 [NETFILTER]: Add ... |
1156 |
{ |
df0933dcb [NETFILTER]: kill... |
1157 |
struct nf_conn *ct; |
9fb9cbb10 [NETFILTER]: Add ... |
1158 |
unsigned int bucket = 0; |
400dad39d netfilter: netns ... |
1159 |
while ((ct = get_next_corpse(net, iter, data, &bucket)) != NULL) { |
9fb9cbb10 [NETFILTER]: Add ... |
1160 1161 1162 1163 1164 1165 1166 1167 |
/* Time to push up daises... */ if (del_timer(&ct->timeout)) death_by_timeout((unsigned long)ct); /* ... else the timer will get him soon. */ nf_ct_put(ct); } } |
13b183391 [NETFILTER]: nf_c... |
1168 |
EXPORT_SYMBOL_GPL(nf_ct_iterate_cleanup); |
9fb9cbb10 [NETFILTER]: Add ... |
1169 |
|
19abb7b09 netfilter: ctnetl... |
1170 1171 1172 1173 |
struct __nf_ct_flush_report { u32 pid; int report; }; |
274d383b9 netfilter: conntr... |
1174 |
static int kill_report(struct nf_conn *i, void *data) |
9fb9cbb10 [NETFILTER]: Add ... |
1175 |
{ |
19abb7b09 netfilter: ctnetl... |
1176 |
struct __nf_ct_flush_report *fr = (struct __nf_ct_flush_report *)data; |
a992ca2a0 netfilter: nf_con... |
1177 1178 1179 1180 1181 |
struct nf_conn_tstamp *tstamp; tstamp = nf_conn_tstamp_find(i); if (tstamp && tstamp->stop == 0) tstamp->stop = ktime_to_ns(ktime_get_real()); |
19abb7b09 netfilter: ctnetl... |
1182 |
|
dd7669a92 netfilter: conntr... |
1183 1184 1185 1186 1187 1188 1189 |
/* If we fail to deliver the event, death_by_timeout() will retry */ if (nf_conntrack_event_report(IPCT_DESTROY, i, fr->pid, fr->report) < 0) return 1; /* Avoid the delivery of the destroy event in death_by_timeout(). */ set_bit(IPS_DYING_BIT, &i->status); |
9fb9cbb10 [NETFILTER]: Add ... |
1190 1191 |
return 1; } |
274d383b9 netfilter: conntr... |
1192 1193 1194 1195 |
static int kill_all(struct nf_conn *i, void *data) { return 1; } |
d862a6622 netfilter: nf_con... |
1196 |
void nf_ct_free_hashtable(void *hash, unsigned int size) |
9fb9cbb10 [NETFILTER]: Add ... |
1197 |
{ |
d862a6622 netfilter: nf_con... |
1198 |
if (is_vmalloc_addr(hash)) |
9fb9cbb10 [NETFILTER]: Add ... |
1199 1200 |
vfree(hash); else |
601e68e10 [NETFILTER]: Fix ... |
1201 |
free_pages((unsigned long)hash, |
f205c5e0c [NETFILTER]: nf_c... |
1202 |
get_order(sizeof(struct hlist_head) * size)); |
9fb9cbb10 [NETFILTER]: Add ... |
1203 |
} |
ac565e5fc [NETFILTER]: nf_c... |
1204 |
EXPORT_SYMBOL_GPL(nf_ct_free_hashtable); |
9fb9cbb10 [NETFILTER]: Add ... |
1205 |
|
274d383b9 netfilter: conntr... |
1206 |
void nf_conntrack_flush_report(struct net *net, u32 pid, int report) |
c1d10adb4 [NETFILTER]: Add ... |
1207 |
{ |
19abb7b09 netfilter: ctnetl... |
1208 1209 1210 1211 |
struct __nf_ct_flush_report fr = { .pid = pid, .report = report, }; |
274d383b9 netfilter: conntr... |
1212 |
nf_ct_iterate_cleanup(net, kill_report, &fr); |
c1d10adb4 [NETFILTER]: Add ... |
1213 |
} |
274d383b9 netfilter: conntr... |
1214 |
EXPORT_SYMBOL_GPL(nf_conntrack_flush_report); |
c1d10adb4 [NETFILTER]: Add ... |
1215 |
|
ee254fa44 netfilter: nf_con... |
1216 |
static void nf_ct_release_dying_list(struct net *net) |
dd7669a92 netfilter: conntr... |
1217 1218 1219 1220 1221 1222 |
{ struct nf_conntrack_tuple_hash *h; struct nf_conn *ct; struct hlist_nulls_node *n; spin_lock_bh(&nf_conntrack_lock); |
ee254fa44 netfilter: nf_con... |
1223 |
hlist_nulls_for_each_entry(h, n, &net->ct.dying, hnnode) { |
dd7669a92 netfilter: conntr... |
1224 1225 1226 1227 1228 1229 |
ct = nf_ct_tuplehash_to_ctrack(h); /* never fails to remove them, no listeners at this point */ nf_ct_kill(ct); } spin_unlock_bh(&nf_conntrack_lock); } |
b3c5163fe netfilter: nf_con... |
1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 |
static int untrack_refs(void) { int cnt = 0, cpu; for_each_possible_cpu(cpu) { struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); cnt += atomic_read(&ct->ct_general.use) - 1; } return cnt; } |
08f6547d2 netfilter: netns ... |
1241 |
static void nf_conntrack_cleanup_init_net(void) |
9fb9cbb10 [NETFILTER]: Add ... |
1242 |
{ |
b3c5163fe netfilter: nf_con... |
1243 |
while (untrack_refs() > 0) |
9edd7ca0a netfilter: nf_con... |
1244 |
schedule(); |
08f6547d2 netfilter: netns ... |
1245 1246 |
nf_conntrack_helper_fini(); nf_conntrack_proto_fini(); |
5d0aa2ccd netfilter: nf_con... |
1247 1248 1249 |
#ifdef CONFIG_NF_CONNTRACK_ZONES nf_ct_extend_unregister(&nf_ct_zone_extend); #endif |
08f6547d2 netfilter: netns ... |
1250 |
} |
9fb9cbb10 [NETFILTER]: Add ... |
1251 |
|
08f6547d2 netfilter: netns ... |
1252 1253 |
static void nf_conntrack_cleanup_net(struct net *net) { |
9fb9cbb10 [NETFILTER]: Add ... |
1254 |
i_see_dead_people: |
274d383b9 netfilter: conntr... |
1255 |
nf_ct_iterate_cleanup(net, kill_all, NULL); |
ee254fa44 netfilter: nf_con... |
1256 |
nf_ct_release_dying_list(net); |
49ac8713b netfilter: netns ... |
1257 |
if (atomic_read(&net->ct.count) != 0) { |
9fb9cbb10 [NETFILTER]: Add ... |
1258 1259 1260 |
schedule(); goto i_see_dead_people; } |
d862a6622 netfilter: nf_con... |
1261 |
nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
a0891aa6a netfilter: conntr... |
1262 |
nf_conntrack_ecache_fini(net); |
fe8f661f2 netfilter: nf_con... |
1263 |
nf_conntrack_tstamp_fini(net); |
d716a4dfb netfilter: netns ... |
1264 |
nf_conntrack_acct_fini(net); |
9b03f38d0 netfilter: netns ... |
1265 |
nf_conntrack_expect_fini(net); |
5b3501faa netfilter: nf_con... |
1266 1267 |
kmem_cache_destroy(net->ct.nf_conntrack_cachep); kfree(net->ct.slabname); |
0d55af879 netfilter: netns ... |
1268 |
free_percpu(net->ct.stat); |
08f6547d2 netfilter: netns ... |
1269 1270 1271 1272 1273 1274 1275 |
} /* Mishearing the voices in his head, our hero wonders how he's supposed to kill the mall. */ void nf_conntrack_cleanup(struct net *net) { if (net_eq(net, &init_net)) |
a9b3cd7f3 rcu: convert uses... |
1276 |
RCU_INIT_POINTER(ip_ct_attach, NULL); |
08f6547d2 netfilter: netns ... |
1277 1278 1279 1280 1281 1282 1283 1284 1285 |
/* This makes sure all current packets have passed through netfilter framework. Roll on, two-stage module delete... */ synchronize_net(); nf_conntrack_cleanup_net(net); if (net_eq(net, &init_net)) { |
a9b3cd7f3 rcu: convert uses... |
1286 |
RCU_INIT_POINTER(nf_ct_destroy, NULL); |
08f6547d2 netfilter: netns ... |
1287 1288 |
nf_conntrack_cleanup_init_net(); } |
9fb9cbb10 [NETFILTER]: Add ... |
1289 |
} |
d862a6622 netfilter: nf_con... |
1290 |
void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls) |
9fb9cbb10 [NETFILTER]: Add ... |
1291 |
{ |
ea781f197 netfilter: nf_con... |
1292 1293 1294 |
struct hlist_nulls_head *hash; unsigned int nr_slots, i; size_t sz; |
9fb9cbb10 [NETFILTER]: Add ... |
1295 |
|
ea781f197 netfilter: nf_con... |
1296 1297 1298 1299 1300 |
BUILD_BUG_ON(sizeof(struct hlist_nulls_head) != sizeof(struct hlist_head)); nr_slots = *sizep = roundup(*sizep, PAGE_SIZE / sizeof(struct hlist_nulls_head)); sz = nr_slots * sizeof(struct hlist_nulls_head); hash = (void *)__get_free_pages(GFP_KERNEL | __GFP_NOWARN | __GFP_ZERO, get_order(sz)); |
601e68e10 [NETFILTER]: Fix ... |
1301 |
if (!hash) { |
9fb9cbb10 [NETFILTER]: Add ... |
1302 1303 |
printk(KERN_WARNING "nf_conntrack: falling back to vmalloc. "); |
966567b76 net: two vzalloc(... |
1304 |
hash = vzalloc(sz); |
9fb9cbb10 [NETFILTER]: Add ... |
1305 |
} |
ea781f197 netfilter: nf_con... |
1306 1307 1308 |
if (hash && nulls) for (i = 0; i < nr_slots; i++) INIT_HLIST_NULLS_HEAD(&hash[i], i); |
9fb9cbb10 [NETFILTER]: Add ... |
1309 1310 1311 |
return hash; } |
ac565e5fc [NETFILTER]: nf_c... |
1312 |
EXPORT_SYMBOL_GPL(nf_ct_alloc_hashtable); |
9fb9cbb10 [NETFILTER]: Add ... |
1313 |
|
fae718dda [NETFILTER]: nf_c... |
1314 |
int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp) |
9fb9cbb10 [NETFILTER]: Add ... |
1315 |
{ |
d862a6622 netfilter: nf_con... |
1316 |
int i, bucket; |
96eb24d77 [NETFILTER]: nf_c... |
1317 |
unsigned int hashsize, old_size; |
ea781f197 netfilter: nf_con... |
1318 |
struct hlist_nulls_head *hash, *old_hash; |
9fb9cbb10 [NETFILTER]: Add ... |
1319 |
struct nf_conntrack_tuple_hash *h; |
5d0aa2ccd netfilter: nf_con... |
1320 |
struct nf_conn *ct; |
9fb9cbb10 [NETFILTER]: Add ... |
1321 |
|
d696c7bda netfilter: nf_con... |
1322 1323 |
if (current->nsproxy->net_ns != &init_net) return -EOPNOTSUPP; |
9fb9cbb10 [NETFILTER]: Add ... |
1324 1325 1326 |
/* On boot, we can set this without any fancy locking. */ if (!nf_conntrack_htable_size) return param_set_uint(val, kp); |
96eb24d77 [NETFILTER]: nf_c... |
1327 |
hashsize = simple_strtoul(val, NULL, 0); |
9fb9cbb10 [NETFILTER]: Add ... |
1328 1329 |
if (!hashsize) return -EINVAL; |
d862a6622 netfilter: nf_con... |
1330 |
hash = nf_ct_alloc_hashtable(&hashsize, 1); |
9fb9cbb10 [NETFILTER]: Add ... |
1331 1332 |
if (!hash) return -ENOMEM; |
76507f69c [NETFILTER]: nf_c... |
1333 1334 1335 1336 1337 |
/* Lookups in the old hash might happen in parallel, which means we * might get false negatives during connection lookup. New connections * created because of a false negative won't make it into the hash * though since that required taking the lock. */ |
f8ba1affa [NETFILTER]: nf_c... |
1338 |
spin_lock_bh(&nf_conntrack_lock); |
d696c7bda netfilter: nf_con... |
1339 |
for (i = 0; i < init_net.ct.htable_size; i++) { |
ea781f197 netfilter: nf_con... |
1340 1341 1342 |
while (!hlist_nulls_empty(&init_net.ct.hash[i])) { h = hlist_nulls_entry(init_net.ct.hash[i].first, struct nf_conntrack_tuple_hash, hnnode); |
5d0aa2ccd netfilter: nf_con... |
1343 |
ct = nf_ct_tuplehash_to_ctrack(h); |
ea781f197 netfilter: nf_con... |
1344 |
hlist_nulls_del_rcu(&h->hnnode); |
5d0aa2ccd netfilter: nf_con... |
1345 |
bucket = __hash_conntrack(&h->tuple, nf_ct_zone(ct), |
99f07e91b netfilter: save t... |
1346 |
hashsize); |
ea781f197 netfilter: nf_con... |
1347 |
hlist_nulls_add_head_rcu(&h->hnnode, &hash[bucket]); |
9fb9cbb10 [NETFILTER]: Add ... |
1348 1349 |
} } |
d696c7bda netfilter: nf_con... |
1350 |
old_size = init_net.ct.htable_size; |
400dad39d netfilter: netns ... |
1351 |
old_hash = init_net.ct.hash; |
9fb9cbb10 [NETFILTER]: Add ... |
1352 |
|
d696c7bda netfilter: nf_con... |
1353 |
init_net.ct.htable_size = nf_conntrack_htable_size = hashsize; |
400dad39d netfilter: netns ... |
1354 |
init_net.ct.hash = hash; |
f8ba1affa [NETFILTER]: nf_c... |
1355 |
spin_unlock_bh(&nf_conntrack_lock); |
9fb9cbb10 [NETFILTER]: Add ... |
1356 |
|
d862a6622 netfilter: nf_con... |
1357 |
nf_ct_free_hashtable(old_hash, old_size); |
9fb9cbb10 [NETFILTER]: Add ... |
1358 1359 |
return 0; } |
fae718dda [NETFILTER]: nf_c... |
1360 |
EXPORT_SYMBOL_GPL(nf_conntrack_set_hashsize); |
9fb9cbb10 [NETFILTER]: Add ... |
1361 |
|
fae718dda [NETFILTER]: nf_c... |
1362 |
module_param_call(hashsize, nf_conntrack_set_hashsize, param_get_uint, |
9fb9cbb10 [NETFILTER]: Add ... |
1363 |
&nf_conntrack_htable_size, 0600); |
5bfddbd46 netfilter: nf_con... |
1364 1365 |
void nf_ct_untracked_status_or(unsigned long bits) { |
b3c5163fe netfilter: nf_con... |
1366 1367 1368 1369 |
int cpu; for_each_possible_cpu(cpu) per_cpu(nf_conntrack_untracked, cpu).status |= bits; |
5bfddbd46 netfilter: nf_con... |
1370 1371 |
} EXPORT_SYMBOL_GPL(nf_ct_untracked_status_or); |
08f6547d2 netfilter: netns ... |
1372 |
static int nf_conntrack_init_init_net(void) |
9fb9cbb10 [NETFILTER]: Add ... |
1373 |
{ |
f205c5e0c [NETFILTER]: nf_c... |
1374 |
int max_factor = 8; |
b3c5163fe netfilter: nf_con... |
1375 |
int ret, cpu; |
9fb9cbb10 [NETFILTER]: Add ... |
1376 1377 |
/* Idea from tcp.c: use 1/16384 of memory. On i386: 32MB |
f205c5e0c [NETFILTER]: nf_c... |
1378 |
* machine has 512 buckets. >= 1GB machines have 16384 buckets. */ |
9fb9cbb10 [NETFILTER]: Add ... |
1379 1380 |
if (!nf_conntrack_htable_size) { nf_conntrack_htable_size |
4481374ce mm: replace vario... |
1381 |
= (((totalram_pages << PAGE_SHIFT) / 16384) |
f205c5e0c [NETFILTER]: nf_c... |
1382 |
/ sizeof(struct hlist_head)); |
4481374ce mm: replace vario... |
1383 |
if (totalram_pages > (1024 * 1024 * 1024 / PAGE_SIZE)) |
f205c5e0c [NETFILTER]: nf_c... |
1384 1385 1386 1387 1388 1389 1390 1391 1392 |
nf_conntrack_htable_size = 16384; if (nf_conntrack_htable_size < 32) nf_conntrack_htable_size = 32; /* Use a max. factor of four by default to get the same max as * with the old struct list_heads. When a table size is given * we use the old value of 8 to avoid reducing the max. * entries. */ max_factor = 4; |
9fb9cbb10 [NETFILTER]: Add ... |
1393 |
} |
f205c5e0c [NETFILTER]: nf_c... |
1394 |
nf_conntrack_max = max_factor * nf_conntrack_htable_size; |
8e5105a0c [NETFILTER]: nf_c... |
1395 |
|
654d0fbdc netfilter: cleanu... |
1396 1397 |
printk(KERN_INFO "nf_conntrack version %s (%u buckets, %d max) ", |
8e5105a0c [NETFILTER]: nf_c... |
1398 1399 |
NF_CONNTRACK_VERSION, nf_conntrack_htable_size, nf_conntrack_max); |
e9c1b084e [NETFILTER]: nf_c... |
1400 1401 |
ret = nf_conntrack_proto_init(); if (ret < 0) |
08f6547d2 netfilter: netns ... |
1402 |
goto err_proto; |
933a41e7e [NETFILTER]: nf_c... |
1403 |
|
ceceae1b1 [NETFILTER]: nf_c... |
1404 1405 |
ret = nf_conntrack_helper_init(); if (ret < 0) |
08f6547d2 netfilter: netns ... |
1406 |
goto err_helper; |
5d0aa2ccd netfilter: nf_con... |
1407 1408 1409 1410 1411 |
#ifdef CONFIG_NF_CONNTRACK_ZONES ret = nf_ct_extend_register(&nf_ct_zone_extend); if (ret < 0) goto err_extend; #endif |
9edd7ca0a netfilter: nf_con... |
1412 |
/* Set up fake conntrack: to never be deleted, not in any hashes */ |
b3c5163fe netfilter: nf_con... |
1413 1414 |
for_each_possible_cpu(cpu) { struct nf_conn *ct = &per_cpu(nf_conntrack_untracked, cpu); |
b3c5163fe netfilter: nf_con... |
1415 1416 1417 |
write_pnet(&ct->ct_net, &init_net); atomic_set(&ct->ct_general.use, 1); } |
9edd7ca0a netfilter: nf_con... |
1418 |
/* - and look it like as a confirmed connection */ |
5bfddbd46 netfilter: nf_con... |
1419 |
nf_ct_untracked_status_or(IPS_CONFIRMED | IPS_UNTRACKED); |
08f6547d2 netfilter: netns ... |
1420 |
return 0; |
5d0aa2ccd netfilter: nf_con... |
1421 1422 1423 1424 |
#ifdef CONFIG_NF_CONNTRACK_ZONES err_extend: nf_conntrack_helper_fini(); #endif |
08f6547d2 netfilter: netns ... |
1425 1426 1427 |
err_helper: nf_conntrack_proto_fini(); err_proto: |
08f6547d2 netfilter: netns ... |
1428 1429 |
return ret; } |
8cc20198c netfilter: nf_con... |
1430 1431 1432 1433 1434 |
/* * We need to use special "null" values, not used in hash table */ #define UNCONFIRMED_NULLS_VAL ((1<<30)+0) #define DYING_NULLS_VAL ((1<<30)+1) |
08f6547d2 netfilter: netns ... |
1435 1436 1437 |
static int nf_conntrack_init_net(struct net *net) { int ret; |
ceceae1b1 [NETFILTER]: nf_c... |
1438 |
|
08f6547d2 netfilter: netns ... |
1439 |
atomic_set(&net->ct.count, 0); |
8cc20198c netfilter: nf_con... |
1440 1441 |
INIT_HLIST_NULLS_HEAD(&net->ct.unconfirmed, UNCONFIRMED_NULLS_VAL); INIT_HLIST_NULLS_HEAD(&net->ct.dying, DYING_NULLS_VAL); |
08f6547d2 netfilter: netns ... |
1442 1443 1444 1445 1446 |
net->ct.stat = alloc_percpu(struct ip_conntrack_stat); if (!net->ct.stat) { ret = -ENOMEM; goto err_stat; } |
5b3501faa netfilter: nf_con... |
1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 |
net->ct.slabname = kasprintf(GFP_KERNEL, "nf_conntrack_%p", net); if (!net->ct.slabname) { ret = -ENOMEM; goto err_slabname; } net->ct.nf_conntrack_cachep = kmem_cache_create(net->ct.slabname, sizeof(struct nf_conn), 0, SLAB_DESTROY_BY_RCU, NULL); if (!net->ct.nf_conntrack_cachep) { printk(KERN_ERR "Unable to create nf_conn slab cache "); ret = -ENOMEM; goto err_cache; } |
d696c7bda netfilter: nf_con... |
1463 1464 |
net->ct.htable_size = nf_conntrack_htable_size; |
d862a6622 netfilter: nf_con... |
1465 |
net->ct.hash = nf_ct_alloc_hashtable(&net->ct.htable_size, 1); |
08f6547d2 netfilter: netns ... |
1466 1467 1468 1469 1470 1471 1472 1473 1474 |
if (!net->ct.hash) { ret = -ENOMEM; printk(KERN_ERR "Unable to create nf_conntrack_hash "); goto err_hash; } ret = nf_conntrack_expect_init(net); if (ret < 0) goto err_expect; |
d716a4dfb netfilter: netns ... |
1475 |
ret = nf_conntrack_acct_init(net); |
584015727 netfilter: accoun... |
1476 |
if (ret < 0) |
08f6547d2 netfilter: netns ... |
1477 |
goto err_acct; |
a992ca2a0 netfilter: nf_con... |
1478 1479 1480 |
ret = nf_conntrack_tstamp_init(net); if (ret < 0) goto err_tstamp; |
a0891aa6a netfilter: conntr... |
1481 1482 1483 |
ret = nf_conntrack_ecache_init(net); if (ret < 0) goto err_ecache; |
7d3cdc6b5 [NETFILTER]: nf_c... |
1484 |
|
08f6547d2 netfilter: netns ... |
1485 |
return 0; |
9fb9cbb10 [NETFILTER]: Add ... |
1486 |
|
a0891aa6a netfilter: conntr... |
1487 |
err_ecache: |
a992ca2a0 netfilter: nf_con... |
1488 1489 |
nf_conntrack_tstamp_fini(net); err_tstamp: |
a0891aa6a netfilter: conntr... |
1490 |
nf_conntrack_acct_fini(net); |
08f6547d2 netfilter: netns ... |
1491 |
err_acct: |
9b03f38d0 netfilter: netns ... |
1492 |
nf_conntrack_expect_fini(net); |
08f6547d2 netfilter: netns ... |
1493 |
err_expect: |
d862a6622 netfilter: nf_con... |
1494 |
nf_ct_free_hashtable(net->ct.hash, net->ct.htable_size); |
6058fa6bb netfilter: netns ... |
1495 |
err_hash: |
5b3501faa netfilter: nf_con... |
1496 1497 1498 1499 |
kmem_cache_destroy(net->ct.nf_conntrack_cachep); err_cache: kfree(net->ct.slabname); err_slabname: |
0d55af879 netfilter: netns ... |
1500 1501 |
free_percpu(net->ct.stat); err_stat: |
08f6547d2 netfilter: netns ... |
1502 1503 |
return ret; } |
f9dd09c7f netfilter: nf_nat... |
1504 1505 1506 1507 |
s16 (*nf_ct_nat_offset)(const struct nf_conn *ct, enum ip_conntrack_dir dir, u32 seq); EXPORT_SYMBOL_GPL(nf_ct_nat_offset); |
08f6547d2 netfilter: netns ... |
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 |
int nf_conntrack_init(struct net *net) { int ret; if (net_eq(net, &init_net)) { ret = nf_conntrack_init_init_net(); if (ret < 0) goto out_init_net; } ret = nf_conntrack_init_net(net); if (ret < 0) goto out_net; if (net_eq(net, &init_net)) { /* For use by REJECT target */ |
a9b3cd7f3 rcu: convert uses... |
1523 1524 |
RCU_INIT_POINTER(ip_ct_attach, nf_conntrack_attach); RCU_INIT_POINTER(nf_ct_destroy, destroy_conntrack); |
f9dd09c7f netfilter: nf_nat... |
1525 1526 |
/* Howto get NAT offsets */ |
a9b3cd7f3 rcu: convert uses... |
1527 |
RCU_INIT_POINTER(nf_ct_nat_offset, NULL); |
08f6547d2 netfilter: netns ... |
1528 1529 1530 1531 1532 1533 1534 1535 |
} return 0; out_net: if (net_eq(net, &init_net)) nf_conntrack_cleanup_init_net(); out_init_net: return ret; |
9fb9cbb10 [NETFILTER]: Add ... |
1536 |
} |