Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 1 | /* |
| 2 | * Connection state tracking for netfilter. This is separated from, |
| 3 | * but required by, the (future) NAT layer; it can also be used by an iptables |
| 4 | * extension. |
| 5 | * |
| 6 | * 16 Dec 2003: Yasuyuki Kozakai @USAGI <yasuyuki.kozakai@toshiba.co.jp> |
| 7 | * - generalize L3 protocol dependent part. |
| 8 | * |
| 9 | * Derived from include/linux/netfiter_ipv4/ip_conntrack.h |
| 10 | */ |
| 11 | |
| 12 | #ifndef _NF_CONNTRACK_H |
| 13 | #define _NF_CONNTRACK_H |
| 14 | |
| 15 | #include <linux/netfilter/nf_conntrack_common.h> |
| 16 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 17 | #include <linux/bitops.h> |
| 18 | #include <linux/compiler.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 19 | #include <linux/atomic.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 20 | |
| 21 | #include <linux/netfilter/nf_conntrack_tcp.h> |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 22 | #include <linux/netfilter/nf_conntrack_dccp.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 23 | #include <linux/netfilter/nf_conntrack_sctp.h> |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 24 | #include <linux/netfilter/nf_conntrack_proto_gre.h> |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 25 | #include <net/netfilter/ipv6/nf_conntrack_icmpv6.h> |
| 26 | |
| 27 | #include <net/netfilter/nf_conntrack_tuple.h> |
| 28 | |
| 29 | /* per conntrack: protocol private data */ |
| 30 | union nf_conntrack_proto { |
| 31 | /* insert conntrack proto private data here */ |
Patrick McHardy | 2bc7804 | 2008-03-20 15:15:55 +0100 | [diff] [blame] | 32 | struct nf_ct_dccp dccp; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 33 | struct ip_ct_sctp sctp; |
| 34 | struct ip_ct_tcp tcp; |
Patrick McHardy | f09943f | 2006-12-02 22:09:41 -0800 | [diff] [blame] | 35 | struct nf_ct_gre gre; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 36 | }; |
| 37 | |
| 38 | union nf_conntrack_expect_proto { |
| 39 | /* insert expect proto private data here */ |
| 40 | }; |
| 41 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 42 | #include <linux/types.h> |
| 43 | #include <linux/skbuff.h> |
| 44 | |
| 45 | #ifdef CONFIG_NETFILTER_DEBUG |
Patrick McHardy | 55871d0 | 2008-04-14 11:15:51 +0200 | [diff] [blame] | 46 | #define NF_CT_ASSERT(x) WARN_ON(!(x)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 47 | #else |
| 48 | #define NF_CT_ASSERT(x) |
| 49 | #endif |
| 50 | |
| 51 | struct nf_conntrack_helper; |
| 52 | |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 53 | /* Must be kept in sync with the classes defined by helpers */ |
Patrick McHardy | 9d288df | 2010-02-11 12:30:21 +0100 | [diff] [blame] | 54 | #define NF_CT_MAX_EXPECT_CLASSES 4 |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 55 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 56 | /* nf_conn feature for connections that have a helper */ |
| 57 | struct nf_conn_help { |
| 58 | /* Helper. if any */ |
Arnd Bergmann | 0906a37 | 2010-03-09 20:59:15 +0100 | [diff] [blame] | 59 | struct nf_conntrack_helper __rcu *helper; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 60 | |
Patrick McHardy | b560580 | 2007-07-07 22:35:56 -0700 | [diff] [blame] | 61 | struct hlist_head expectations; |
| 62 | |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 63 | /* Current number of expected connections */ |
Patrick McHardy | 6002f266 | 2008-03-25 20:09:15 -0700 | [diff] [blame] | 64 | u8 expecting[NF_CT_MAX_EXPECT_CLASSES]; |
Pablo Neira Ayuso | 1afc567 | 2012-06-07 12:11:50 +0200 | [diff] [blame] | 65 | |
| 66 | /* private helper information. */ |
| 67 | char data[]; |
Harald Welte | dc808fe | 2006-03-20 17:56:32 -0800 | [diff] [blame] | 68 | }; |
| 69 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 70 | #include <net/netfilter/ipv4/nf_conntrack_ipv4.h> |
Patrick McHardy | f8eb24a | 2006-11-29 02:35:15 +0100 | [diff] [blame] | 71 | #include <net/netfilter/ipv6/nf_conntrack_ipv6.h> |
| 72 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 73 | struct nf_conn { |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 74 | /* Usage count in here is 1 for hash table, 1 per skb, |
Jesper Dangaard Brouer | b476b72 | 2014-03-03 14:44:54 +0100 | [diff] [blame] | 75 | * plus 1 for any connection(s) we are `master' for |
| 76 | * |
| 77 | * Hint, SKB address this struct and refcnt via skb->nfct and |
| 78 | * helpers nf_conntrack_get() and nf_conntrack_put(). |
| 79 | * Helper nf_ct_put() equals nf_conntrack_put() by dec refcnt, |
| 80 | * beware nf_ct_get() is different and don't inc refcnt. |
| 81 | */ |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 82 | struct nf_conntrack ct_general; |
| 83 | |
Jesper Dangaard Brouer | b7779d0 | 2014-03-03 14:45:20 +0100 | [diff] [blame] | 84 | spinlock_t lock; |
| 85 | u16 cpu; |
Patrick McHardy | 440f0d5 | 2009-06-10 14:32:47 +0200 | [diff] [blame] | 86 | |
Florian Westphal | 6c8dee9 | 2016-06-11 21:57:35 +0200 | [diff] [blame] | 87 | #ifdef CONFIG_NF_CONNTRACK_ZONES |
| 88 | struct nf_conntrack_zone zone; |
| 89 | #endif |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 90 | /* XXX should I move this to the tail ? - Y.K */ |
| 91 | /* These are my tuples; original and reply */ |
| 92 | struct nf_conntrack_tuple_hash tuplehash[IP_CT_DIR_MAX]; |
| 93 | |
| 94 | /* Have we seen traffic both ways yet? (bitset) */ |
| 95 | unsigned long status; |
| 96 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 97 | /* jiffies32 when this ct is considered dead */ |
| 98 | u32 timeout; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 99 | |
Eric W. Biederman | 0c5c9fb | 2015-03-11 23:06:44 -0500 | [diff] [blame] | 100 | possible_net_t ct_net; |
| 101 | |
Florian Westphal | 5173bc6 | 2016-11-23 01:11:03 +0100 | [diff] [blame] | 102 | #if IS_ENABLED(CONFIG_NF_NAT) |
Florian Westphal | a23349b | 2017-09-06 14:39:51 +0200 | [diff] [blame] | 103 | struct hlist_node nat_bysource; |
Florian Westphal | 5173bc6 | 2016-11-23 01:11:03 +0100 | [diff] [blame] | 104 | #endif |
Florian Westphal | c41884c | 2014-11-24 15:25:57 +0100 | [diff] [blame] | 105 | /* all members below initialized via memset */ |
| 106 | u8 __nfct_init_offset[0]; |
| 107 | |
| 108 | /* If we were expected by an expectation, this will be it */ |
| 109 | struct nf_conn *master; |
| 110 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 111 | #if defined(CONFIG_NF_CONNTRACK_MARK) |
| 112 | u_int32_t mark; |
| 113 | #endif |
| 114 | |
James Morris | 7c9728c | 2006-06-09 00:31:46 -0700 | [diff] [blame] | 115 | #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| 116 | u_int32_t secmark; |
| 117 | #endif |
| 118 | |
Yasuyuki Kozakai | ecfab2c | 2007-07-07 22:23:21 -0700 | [diff] [blame] | 119 | /* Extensions */ |
| 120 | struct nf_ct_ext *ext; |
Changli Gao | e5fc9e7 | 2010-11-12 17:33:17 +0100 | [diff] [blame] | 121 | |
| 122 | /* Storage reserved for other modules, must be the last member */ |
| 123 | union nf_conntrack_proto proto; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 124 | }; |
| 125 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 126 | static inline struct nf_conn * |
| 127 | nf_ct_tuplehash_to_ctrack(const struct nf_conntrack_tuple_hash *hash) |
| 128 | { |
| 129 | return container_of(hash, struct nf_conn, |
| 130 | tuplehash[hash->tuple.dst.dir]); |
| 131 | } |
| 132 | |
Patrick McHardy | 5e8fbe2 | 2008-04-14 11:15:52 +0200 | [diff] [blame] | 133 | static inline u_int16_t nf_ct_l3num(const struct nf_conn *ct) |
| 134 | { |
| 135 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.l3num; |
| 136 | } |
| 137 | |
| 138 | static inline u_int8_t nf_ct_protonum(const struct nf_conn *ct) |
| 139 | { |
| 140 | return ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.protonum; |
| 141 | } |
| 142 | |
Pablo Neira Ayuso | f2f3e38 | 2009-06-02 20:03:35 +0200 | [diff] [blame] | 143 | #define nf_ct_tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
| 144 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 145 | /* get master conntrack via master expectation */ |
| 146 | #define master_ct(conntr) (conntr->master) |
| 147 | |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 148 | extern struct net init_net; |
| 149 | |
| 150 | static inline struct net *nf_ct_net(const struct nf_conn *ct) |
| 151 | { |
Eric Dumazet | c2d9ba9 | 2010-06-01 06:51:19 +0000 | [diff] [blame] | 152 | return read_pnet(&ct->ct_net); |
Alexey Dobriyan | 5a1fb39 | 2008-10-08 11:35:02 +0200 | [diff] [blame] | 153 | } |
| 154 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 155 | /* Alter reply tuple (maybe alter helper). */ |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 156 | void nf_conntrack_alter_reply(struct nf_conn *ct, |
| 157 | const struct nf_conntrack_tuple *newreply); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 158 | |
| 159 | /* Is this tuple taken? (ignoring any belonging to the given |
| 160 | conntrack). */ |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 161 | int nf_conntrack_tuple_taken(const struct nf_conntrack_tuple *tuple, |
| 162 | const struct nf_conn *ignored_conntrack); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 163 | |
| 164 | /* Return conntrack_info and tuple hash for given skb. */ |
| 165 | static inline struct nf_conn * |
| 166 | nf_ct_get(const struct sk_buff *skb, enum ip_conntrack_info *ctinfo) |
| 167 | { |
| 168 | *ctinfo = skb->nfctinfo; |
| 169 | return (struct nf_conn *)skb->nfct; |
| 170 | } |
| 171 | |
| 172 | /* decrement reference count on a conntrack */ |
| 173 | static inline void nf_ct_put(struct nf_conn *ct) |
| 174 | { |
| 175 | NF_CT_ASSERT(ct); |
| 176 | nf_conntrack_put(&ct->ct_general); |
| 177 | } |
| 178 | |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 179 | /* Protocol module loading */ |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 180 | int nf_ct_l3proto_try_module_get(unsigned short l3proto); |
| 181 | void nf_ct_l3proto_module_put(unsigned short l3proto); |
Pablo Neira Ayuso | b9f78f9 | 2006-03-22 13:56:08 -0800 | [diff] [blame] | 182 | |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 183 | /* |
| 184 | * Allocate a hashtable of hlist_head (if nulls == 0), |
| 185 | * or hlist_nulls_head (if nulls == 1) |
| 186 | */ |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 187 | void *nf_ct_alloc_hashtable(unsigned int *sizep, int nulls); |
Eric Dumazet | ea781f1 | 2009-03-25 21:05:46 +0100 | [diff] [blame] | 188 | |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 189 | void nf_ct_free_hashtable(void *hash, unsigned int size); |
Patrick McHardy | ac565e5 | 2007-07-07 22:30:08 -0700 | [diff] [blame] | 190 | |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 191 | int nf_conntrack_hash_check_insert(struct nf_conn *ct); |
Florian Westphal | 02982c2 | 2013-07-29 15:41:54 +0200 | [diff] [blame] | 192 | bool nf_ct_delete(struct nf_conn *ct, u32 pid, int report); |
Pablo Neira Ayuso | c1d10ad | 2006-01-05 12:19:05 -0800 | [diff] [blame] | 193 | |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 194 | bool nf_ct_get_tuplepr(const struct sk_buff *skb, unsigned int nhoff, |
Eric W. Biederman | a31f1ad | 2015-09-18 14:33:04 -0500 | [diff] [blame] | 195 | u_int16_t l3num, struct net *net, |
| 196 | struct nf_conntrack_tuple *tuple); |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 197 | bool nf_ct_invert_tuplepr(struct nf_conntrack_tuple *inverse, |
| 198 | const struct nf_conntrack_tuple *orig); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 199 | |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 200 | void __nf_ct_refresh_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 201 | const struct sk_buff *skb, |
| 202 | unsigned long extra_jiffies, int do_acct); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 203 | |
| 204 | /* Refresh conntrack for this many jiffies and do accounting */ |
| 205 | static inline void nf_ct_refresh_acct(struct nf_conn *ct, |
| 206 | enum ip_conntrack_info ctinfo, |
| 207 | const struct sk_buff *skb, |
| 208 | unsigned long extra_jiffies) |
| 209 | { |
| 210 | __nf_ct_refresh_acct(ct, ctinfo, skb, extra_jiffies, 1); |
| 211 | } |
| 212 | |
| 213 | /* Refresh conntrack for this many jiffies */ |
| 214 | static inline void nf_ct_refresh(struct nf_conn *ct, |
| 215 | const struct sk_buff *skb, |
| 216 | unsigned long extra_jiffies) |
| 217 | { |
| 218 | __nf_ct_refresh_acct(ct, 0, skb, extra_jiffies, 0); |
| 219 | } |
| 220 | |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 221 | /* kill conntrack and do accounting */ |
Florian Westphal | ad66713 | 2016-08-25 15:33:35 +0200 | [diff] [blame] | 222 | bool nf_ct_kill_acct(struct nf_conn *ct, enum ip_conntrack_info ctinfo, |
| 223 | const struct sk_buff *skb); |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 224 | |
| 225 | /* kill conntrack without accounting */ |
David S. Miller | 4c88949 | 2008-07-14 20:22:38 -0700 | [diff] [blame] | 226 | static inline bool nf_ct_kill(struct nf_conn *ct) |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 227 | { |
Florian Westphal | ad66713 | 2016-08-25 15:33:35 +0200 | [diff] [blame] | 228 | return nf_ct_delete(ct, 0, 0); |
Fabian Hugelshofer | 718d4ad | 2008-06-09 15:59:40 -0700 | [diff] [blame] | 229 | } |
Patrick McHardy | 5109176 | 2008-06-09 15:59:06 -0700 | [diff] [blame] | 230 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 231 | /* These are for NAT. Icky. */ |
Patrick McHardy | 2d89c68 | 2013-07-28 22:54:10 +0200 | [diff] [blame] | 232 | extern s32 (*nf_ct_nat_offset)(const struct nf_conn *ct, |
Jozsef Kadlecsik | f9dd09c | 2009-11-06 00:43:42 -0800 | [diff] [blame] | 233 | enum ip_conntrack_dir dir, |
| 234 | u32 seq); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 235 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 236 | /* Fake conntrack entry for untracked connections */ |
Eric Dumazet | b3c5163 | 2010-06-09 14:43:38 +0200 | [diff] [blame] | 237 | DECLARE_PER_CPU(struct nf_conn, nf_conntrack_untracked); |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 238 | static inline struct nf_conn *nf_ct_untracked_get(void) |
| 239 | { |
Christoph Lameter | 903ceff | 2014-08-17 12:30:35 -0500 | [diff] [blame] | 240 | return raw_cpu_ptr(&nf_conntrack_untracked); |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 241 | } |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 242 | void nf_ct_untracked_status_or(unsigned long bits); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 243 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 244 | /* Iterate over all conntracks: if iter returns true, it's deleted. */ |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 245 | void nf_ct_iterate_cleanup(struct net *net, |
| 246 | int (*iter)(struct nf_conn *i, void *data), |
| 247 | void *data, u32 portid, int report); |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 248 | |
| 249 | struct nf_conntrack_zone; |
| 250 | |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 251 | void nf_conntrack_free(struct nf_conn *ct); |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 252 | struct nf_conn *nf_conntrack_alloc(struct net *net, |
| 253 | const struct nf_conntrack_zone *zone, |
Joe Perches | 4e77be4 | 2013-09-23 11:37:48 -0700 | [diff] [blame] | 254 | const struct nf_conntrack_tuple *orig, |
| 255 | const struct nf_conntrack_tuple *repl, |
| 256 | gfp_t gfp); |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 257 | |
Patrick McHardy | b2a15a6 | 2010-02-03 14:13:03 +0100 | [diff] [blame] | 258 | static inline int nf_ct_is_template(const struct nf_conn *ct) |
| 259 | { |
| 260 | return test_bit(IPS_TEMPLATE_BIT, &ct->status); |
| 261 | } |
| 262 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 263 | /* It's confirmed if it is, or has been in the hash table. */ |
Florian Westphal | d51ed83 | 2016-07-08 13:08:50 +0200 | [diff] [blame] | 264 | static inline int nf_ct_is_confirmed(const struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 265 | { |
| 266 | return test_bit(IPS_CONFIRMED_BIT, &ct->status); |
| 267 | } |
| 268 | |
Florian Westphal | d51ed83 | 2016-07-08 13:08:50 +0200 | [diff] [blame] | 269 | static inline int nf_ct_is_dying(const struct nf_conn *ct) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 270 | { |
| 271 | return test_bit(IPS_DYING_BIT, &ct->status); |
| 272 | } |
| 273 | |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 274 | static inline int nf_ct_is_untracked(const struct nf_conn *ct) |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 275 | { |
Eric Dumazet | 5bfddbd | 2010-06-08 16:09:52 +0200 | [diff] [blame] | 276 | return test_bit(IPS_UNTRACKED_BIT, &ct->status); |
Patrick McHardy | 587aa64 | 2007-03-14 16:37:25 -0700 | [diff] [blame] | 277 | } |
| 278 | |
Julian Anastasov | 42c1edd | 2011-06-16 17:29:22 +0200 | [diff] [blame] | 279 | /* Packet is received from loopback */ |
| 280 | static inline bool nf_is_loopback_packet(const struct sk_buff *skb) |
| 281 | { |
| 282 | return skb->dev && skb->skb_iif && skb->dev->flags & IFF_LOOPBACK; |
| 283 | } |
| 284 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 285 | #define nfct_time_stamp ((u32)(jiffies)) |
| 286 | |
Florian Westphal | c8607e0 | 2016-07-06 14:53:06 +0200 | [diff] [blame] | 287 | /* jiffies until ct expires, 0 if already expired */ |
| 288 | static inline unsigned long nf_ct_expires(const struct nf_conn *ct) |
| 289 | { |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 290 | s32 timeout = ct->timeout - nfct_time_stamp; |
Florian Westphal | c8607e0 | 2016-07-06 14:53:06 +0200 | [diff] [blame] | 291 | |
| 292 | return timeout > 0 ? timeout : 0; |
| 293 | } |
| 294 | |
Florian Westphal | f330a7f | 2016-08-25 15:33:31 +0200 | [diff] [blame] | 295 | static inline bool nf_ct_is_expired(const struct nf_conn *ct) |
| 296 | { |
| 297 | return (__s32)(ct->timeout - nfct_time_stamp) <= 0; |
| 298 | } |
| 299 | |
| 300 | /* use after obtaining a reference count */ |
| 301 | static inline bool nf_ct_should_gc(const struct nf_conn *ct) |
| 302 | { |
| 303 | return nf_ct_is_expired(ct) && nf_ct_is_confirmed(ct) && |
| 304 | !nf_ct_is_dying(ct); |
| 305 | } |
| 306 | |
Paul Gortmaker | 34641c6 | 2011-08-29 13:21:14 -0400 | [diff] [blame] | 307 | struct kernel_param; |
| 308 | |
Kees Cook | 24da2c8 | 2017-10-17 19:04:42 -0700 | [diff] [blame] | 309 | int nf_conntrack_set_hashsize(const char *val, const struct kernel_param *kp); |
Florian Westphal | 3183ab8 | 2016-06-22 13:26:10 +0200 | [diff] [blame] | 310 | int nf_conntrack_hash_resize(unsigned int hashsize); |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 311 | |
| 312 | extern struct hlist_nulls_head *nf_conntrack_hash; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 313 | extern unsigned int nf_conntrack_htable_size; |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 314 | extern seqcount_t nf_conntrack_generation; |
Hagen Paul Pfeifer | e478075 | 2009-02-20 10:47:09 +0100 | [diff] [blame] | 315 | extern unsigned int nf_conntrack_max; |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 316 | |
Liping Zhang | 92e47ba | 2016-08-13 22:35:36 +0800 | [diff] [blame] | 317 | /* must be called with rcu read lock held */ |
| 318 | static inline void |
| 319 | nf_conntrack_get_ht(struct hlist_nulls_head **hash, unsigned int *hsize) |
| 320 | { |
| 321 | struct hlist_nulls_head *hptr; |
| 322 | unsigned int sequence, hsz; |
| 323 | |
| 324 | do { |
| 325 | sequence = read_seqcount_begin(&nf_conntrack_generation); |
| 326 | hsz = nf_conntrack_htable_size; |
| 327 | hptr = nf_conntrack_hash; |
| 328 | } while (read_seqcount_retry(&nf_conntrack_generation, sequence)); |
| 329 | |
| 330 | *hash = hptr; |
| 331 | *hsize = hsz; |
| 332 | } |
| 333 | |
Daniel Borkmann | 308ac91 | 2015-08-08 21:40:01 +0200 | [diff] [blame] | 334 | struct nf_conn *nf_ct_tmpl_alloc(struct net *net, |
| 335 | const struct nf_conntrack_zone *zone, |
| 336 | gfp_t flags); |
Daniel Borkmann | 9cf94ea | 2015-08-31 19:11:02 +0200 | [diff] [blame] | 337 | void nf_ct_tmpl_free(struct nf_conn *tmpl); |
Pablo Neira Ayuso | e53376b | 2014-02-03 20:01:53 +0100 | [diff] [blame] | 338 | |
Eric Dumazet | ac3a546 | 2012-04-18 06:36:40 +0200 | [diff] [blame] | 339 | #define NF_CT_STAT_INC(net, count) __this_cpu_inc((net)->ct.stat->count) |
| 340 | #define NF_CT_STAT_INC_ATOMIC(net, count) this_cpu_inc((net)->ct.stat->count) |
Florian Westphal | 242922a | 2016-07-03 20:44:01 +0200 | [diff] [blame] | 341 | #define NF_CT_STAT_ADD_ATOMIC(net, count, v) this_cpu_add((net)->ct.stat->count, (v)) |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 342 | |
Pablo Neira Ayuso | 4dc06f9 | 2008-11-17 16:01:42 +0100 | [diff] [blame] | 343 | #define MODULE_ALIAS_NFCT_HELPER(helper) \ |
| 344 | MODULE_ALIAS("nfct-helper-" helper) |
| 345 | |
Yasuyuki Kozakai | 9fb9cbb | 2005-11-09 16:38:16 -0800 | [diff] [blame] | 346 | #endif /* _NF_CONNTRACK_H */ |