diff options
author | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 12:17:53 -0700 |
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committer | Yunhong Jiang <yunhong.jiang@intel.com> | 2015-08-04 15:44:42 -0700 |
commit | 9ca8dbcc65cfc63d6f5ef3312a33184e1d726e00 (patch) | |
tree | 1c9cafbcd35f783a87880a10f85d1a060db1a563 /kernel/include/net/netfilter/nf_conntrack.h | |
parent | 98260f3884f4a202f9ca5eabed40b1354c489b29 (diff) |
Add the rt linux 4.1.3-rt3 as base
Import the rt linux 4.1.3-rt3 as OPNFV kvm base.
It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:
commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date: Sat Jul 25 12:13:34 2015 +0200
Prepare v4.1.3-rt3
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.
Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>
Diffstat (limited to 'kernel/include/net/netfilter/nf_conntrack.h')
-rw-r--r-- | kernel/include/net/netfilter/nf_conntrack.h | 302 |
1 files changed, 302 insertions, 0 deletions
diff --git a/kernel/include/net/netfilter/nf_conntrack.h b/kernel/include/net/netfilter/nf_conntrack.h new file mode 100644 index 000000000..095433b8a --- /dev/null +++ b/kernel/include/net/netfilter/nf_conntrack.h @@ -0,0 +1,302 @@ +/* + * Connection state tracking for netfilter. This is separated from, + * but required by, the (future) NAT layer; it can also be used by an iptables + * extension. + * + * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> + * - generalize L3 protocol dependent part. + * + * Derived from include/linux/netfiter_ipv4/ip_conntrack.h + */ + +#ifndef _NF_CONNTRACK_H +#define _NF_CONNTRACK_H + +#include <linux/netfilter/nf_conntrack_common.h> + +#include <linux/bitops.h> +#include <linux/compiler.h> +#include <linux/atomic.h> + +#include <linux/netfilter/nf_conntrack_tcp.h> +#include <linux/netfilter/nf_conntrack_dccp.h> +#include <linux/netfilter/nf_conntrack_sctp.h> +#include <linux/netfilter/nf_conntrack_proto_gre.h> +#include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> + +#include <net/netfilter/nf_conntrack_tuple.h> + +/* per conntrack: protocol private data */ +union nf_conntrack_proto { + /* insert conntrack proto private data here */ + struct nf_ct_dccp dccp; + struct ip_ct_sctp sctp; + struct ip_ct_tcp tcp; + struct nf_ct_gre gre; +}; + +union nf_conntrack_expect_proto { + /* insert expect proto private data here */ +}; + +#include <linux/types.h> +#include <linux/skbuff.h> +#include <linux/timer.h> + +#ifdef CONFIG_NETFILTER_DEBUG +#define NF_CT_ASSERT(x) WARN_ON(!(x)) +#else +#define NF_CT_ASSERT(x) +#endif + +struct nf_conntrack_helper; + +/* Must be kept in sync with the classes defined by helpers */ +#define NF_CT_MAX_EXPECT_CLASSES 4 + +/* nf_conn feature for connections that have a helper */ +struct nf_conn_help { + /* Helper. if any */ + struct nf_conntrack_helper __rcu *helper; + + struct hlist_head expectations; + + /* Current number of expected connections */ + u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; + + /* private helper information. */ + char data[]; +}; + +#include <net/netfilter/ipv4/nf_conntrack_ipv4.h> +#include <net/netfilter/ipv6/nf_conntrack_ipv6.h> + +struct nf_conn { + /* Usage count in here is 1 for hash table/destruct timer, 1 per skb, + * plus 1 for any connection(s) we are `master' for + * + * Hint, SKB address this struct and refcnt via skb->nfct and + * helpers nf_conntrack_get() and nf_conntrack_put(). + * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt, + * beware nf_ct_get() is different and don't inc refcnt. + */ + struct nf_conntrack ct_general; + + spinlock_t lock; + u16 cpu; + + /* XXX should I move this to the tail ? - Y.K */ + /* These are my tuples; original and reply */ + struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; + + /* Have we seen traffic both ways yet? (bitset) */ + unsigned long status; + + /* Timer function; drops refcnt when it goes off. */ + struct timer_list timeout; + + possible_net_t ct_net; + + /* all members below initialized via memset */ + u8 __nfct_init_offset[0]; + + /* If we were expected by an expectation, this will be it */ + struct nf_conn *master; + +#if defined(CONFIG_NF_CONNTRACK_MARK) + u_int32_t mark; +#endif + +#ifdef CONFIG_NF_CONNTRACK_SECMARK + u_int32_t secmark; +#endif + + /* Extensions */ + struct nf_ct_ext *ext; + + /* Storage reserved for other modules, must be the last member */ + union nf_conntrack_proto proto; +}; + +static inline struct nf_conn * +nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) +{ + return container_of(hash, struct nf_conn, + tuplehash[hash->tuple.dst.dir]); +} + +static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct) +{ + return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; +} + +static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct) +{ + return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; +} + +#define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) + +/* get master conntrack via master expectation */ +#define master_ct(conntr) (conntr->master) + +extern struct net init_net; + +static inline struct net *nf_ct_net(const struct nf_conn *ct) +{ + return read_pnet(&ct->ct_net); +} + +/* Alter reply tuple (maybe alter helper). */ +void nf_conntrack_alter_reply(struct nf_conn *ct, + const struct nf_conntrack_tuple *newreply); + +/* Is this tuple taken? (ignoring any belonging to the given + conntrack). */ +int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, + const struct nf_conn *ignored_conntrack); + +/* Return conntrack_info and tuple hash for given skb. */ +static inline struct nf_conn * +nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) +{ + *ctinfo = skb->nfctinfo; + return (struct nf_conn *)skb->nfct; +} + +/* decrement reference count on a conntrack */ +static inline void nf_ct_put(struct nf_conn *ct) +{ + NF_CT_ASSERT(ct); + nf_conntrack_put(&ct->ct_general); +} + +/* Protocol module loading */ +int nf_ct_l3proto_try_module_get(unsigned short l3proto); +void nf_ct_l3proto_module_put(unsigned short l3proto); + +/* + * Allocate a hashtable of hlist_head (if nulls == 0), + * or hlist_nulls_head (if nulls == 1) + */ +void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls); + +void nf_ct_free_hashtable(void *hash, unsigned int size); + +struct nf_conntrack_tuple_hash * +__nf_conntrack_find(struct net *net, u16 zone, + const struct nf_conntrack_tuple *tuple); + +int nf_conntrack_hash_check_insert(struct nf_conn *ct); +bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report); + +bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, + u_int16_t l3num, struct nf_conntrack_tuple *tuple); +bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, + const struct nf_conntrack_tuple *orig); + +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); + +/* Refresh conntrack for this many jiffies and do accounting */ +static inline void nf_ct_refresh_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, + unsigned long extra_jiffies) +{ + __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); +} + +/* Refresh conntrack for this many jiffies */ +static inline void nf_ct_refresh(struct nf_conn *ct, + const struct sk_buff *skb, + unsigned long extra_jiffies) +{ + __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); +} + +bool __nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, + const struct sk_buff *skb, int do_acct); + +/* kill conntrack and do accounting */ +static inline bool nf_ct_kill_acct(struct nf_conn *ct, + enum ip_conntrack_info ctinfo, + const struct sk_buff *skb) +{ + return __nf_ct_kill_acct(ct, ctinfo, skb, 1); +} + +/* kill conntrack without accounting */ +static inline bool nf_ct_kill(struct nf_conn *ct) +{ + return __nf_ct_kill_acct(ct, 0, NULL, 0); +} + +/* These are for NAT. Icky. */ +extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct, + enum ip_conntrack_dir dir, + u32 seq); + +/* Fake conntrack entry for untracked connections */ +DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked); +static inline struct nf_conn *nf_ct_untracked_get(void) +{ + return raw_cpu_ptr(&nf_conntrack_untracked); +} +void nf_ct_untracked_status_or(unsigned long bits); + +/* Iterate over all conntracks: if iter returns true, it's deleted. */ +void nf_ct_iterate_cleanup(struct net *net, + int (*iter)(struct nf_conn *i, void *data), + void *data, u32 portid, int report); +void nf_conntrack_free(struct nf_conn *ct); +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); + +static inline int nf_ct_is_template(const struct nf_conn *ct) +{ + return test_bit(IPS_TEMPLATE_BIT, &ct->status); +} + +/* It's confirmed if it is, or has been in the hash table. */ +static inline int nf_ct_is_confirmed(struct nf_conn *ct) +{ + return test_bit(IPS_CONFIRMED_BIT, &ct->status); +} + +static inline int nf_ct_is_dying(struct nf_conn *ct) +{ + return test_bit(IPS_DYING_BIT, &ct->status); +} + +static inline int nf_ct_is_untracked(const struct nf_conn *ct) +{ + return test_bit(IPS_UNTRACKED_BIT, &ct->status); +} + +/* Packet is received from loopback */ +static inline bool nf_is_loopback_packet(const struct sk_buff *skb) +{ + return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK; +} + +struct kernel_param; + +int nf_conntrack_set_hashsize(const char *val, struct kernel_param *kp); +extern unsigned int nf_conntrack_htable_size; +extern unsigned int nf_conntrack_max; +extern unsigned int nf_conntrack_hash_rnd; +void init_nf_conntrack_hash_rnd(void); + +void nf_conntrack_tmpl_insert(struct net *net, struct nf_conn *tmpl); + +#define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count) +#define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count) + +#define MODULE_ALIAS_NFCT_HELPER(helper) \ + MODULE_ALIAS("nfct-helper-" helper) + +#endif /* _NF_CONNTRACK_H */ |