Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | #ifndef __LINUX_NETFILTER_H |
| 2 | #define __LINUX_NETFILTER_H |
| 3 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | #include <linux/skbuff.h> |
| 6 | #include <linux/net.h> |
| 7 | #include <linux/if.h> |
Jan Engelhardt | 2e3075a | 2008-01-14 23:40:34 -0800 | [diff] [blame] | 8 | #include <linux/in.h> |
| 9 | #include <linux/in6.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | #include <linux/wait.h> |
| 11 | #include <linux/list.h> |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 12 | #include <linux/static_key.h> |
David Howells | 607ca46 | 2012-10-13 10:46:48 +0100 | [diff] [blame] | 13 | #include <uapi/linux/netfilter.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | #ifdef CONFIG_NETFILTER |
Florian Westphal | f615df7 | 2011-01-18 15:52:14 +0100 | [diff] [blame] | 15 | static inline int NF_DROP_GETERR(int verdict) |
| 16 | { |
| 17 | return -(verdict >> NF_VERDICT_QBITS); |
| 18 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | |
Patrick McHardy | b8beedd | 2008-03-25 20:09:33 -0700 | [diff] [blame] | 20 | static inline int nf_inet_addr_cmp(const union nf_inet_addr *a1, |
| 21 | const union nf_inet_addr *a2) |
| 22 | { |
| 23 | return a1->all[0] == a2->all[0] && |
| 24 | a1->all[1] == a2->all[1] && |
| 25 | a1->all[2] == a2->all[2] && |
| 26 | a1->all[3] == a2->all[3]; |
| 27 | } |
| 28 | |
Denys Fedoryshchenko | efdedd5 | 2012-05-17 23:08:57 +0300 | [diff] [blame] | 29 | static inline void nf_inet_addr_mask(const union nf_inet_addr *a1, |
| 30 | union nf_inet_addr *result, |
| 31 | const union nf_inet_addr *mask) |
| 32 | { |
| 33 | result->all[0] = a1->all[0] & mask->all[0]; |
| 34 | result->all[1] = a1->all[1] & mask->all[1]; |
| 35 | result->all[2] = a1->all[2] & mask->all[2]; |
| 36 | result->all[3] = a1->all[3] & mask->all[3]; |
| 37 | } |
| 38 | |
Joe Perches | a0f4ecf | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 39 | int netfilter_init(void); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | /* Largest hook number + 1 */ |
| 42 | #define NF_MAX_HOOKS 8 |
| 43 | |
| 44 | struct sk_buff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 46 | struct nf_hook_ops; |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 47 | |
| 48 | struct nf_hook_state { |
| 49 | unsigned int hook; |
| 50 | int thresh; |
| 51 | u_int8_t pf; |
| 52 | struct net_device *in; |
| 53 | struct net_device *out; |
| 54 | int (*okfn)(struct sk_buff *); |
| 55 | }; |
| 56 | |
David Miller | 107a9f4 | 2015-04-05 22:18:54 -0400 | [diff] [blame^] | 57 | static inline void nf_hook_state_init(struct nf_hook_state *p, |
| 58 | unsigned int hook, |
| 59 | int thresh, u_int8_t pf, |
| 60 | struct net_device *indev, |
| 61 | struct net_device *outdev, |
| 62 | int (*okfn)(struct sk_buff *)) |
| 63 | { |
| 64 | p->hook = hook; |
| 65 | p->thresh = thresh; |
| 66 | p->pf = pf; |
| 67 | p->in = indev; |
| 68 | p->out = outdev; |
| 69 | p->okfn = okfn; |
| 70 | } |
| 71 | |
Patrick McHardy | 795aa6e | 2013-10-10 09:21:55 +0200 | [diff] [blame] | 72 | typedef unsigned int nf_hookfn(const struct nf_hook_ops *ops, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 73 | struct sk_buff *skb, |
David S. Miller | 238e54c | 2015-04-03 20:32:56 -0400 | [diff] [blame] | 74 | const struct nf_hook_state *state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | |
Eric Dumazet | d94d9fe | 2009-11-04 09:50:58 -0800 | [diff] [blame] | 76 | struct nf_hook_ops { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | struct list_head list; |
| 78 | |
| 79 | /* User fills in from here down. */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 80 | nf_hookfn *hook; |
| 81 | struct module *owner; |
| 82 | void *priv; |
| 83 | u_int8_t pf; |
| 84 | unsigned int hooknum; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 85 | /* Hooks are ordered in ascending priority. */ |
Patrick McHardy | 9651851 | 2013-10-14 11:00:02 +0200 | [diff] [blame] | 86 | int priority; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | }; |
| 88 | |
Eric Dumazet | d94d9fe | 2009-11-04 09:50:58 -0800 | [diff] [blame] | 89 | struct nf_sockopt_ops { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | struct list_head list; |
| 91 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 92 | u_int8_t pf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | |
| 94 | /* Non-inclusive ranges: use 0/0/NULL to never get called. */ |
| 95 | int set_optmin; |
| 96 | int set_optmax; |
| 97 | int (*set)(struct sock *sk, int optval, void __user *user, unsigned int len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 98 | #ifdef CONFIG_COMPAT |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 99 | int (*compat_set)(struct sock *sk, int optval, |
| 100 | void __user *user, unsigned int len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 101 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | int get_optmin; |
| 103 | int get_optmax; |
| 104 | int (*get)(struct sock *sk, int optval, void __user *user, int *len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 105 | #ifdef CONFIG_COMPAT |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 106 | int (*compat_get)(struct sock *sk, int optval, |
| 107 | void __user *user, int *len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 108 | #endif |
Neil Horman | 16fcec3 | 2007-09-11 11:28:26 +0200 | [diff] [blame] | 109 | /* Use the module struct to lock set/get code in place */ |
| 110 | struct module *owner; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 111 | }; |
| 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | /* Function to register/unregister hook points. */ |
| 114 | int nf_register_hook(struct nf_hook_ops *reg); |
| 115 | void nf_unregister_hook(struct nf_hook_ops *reg); |
Patrick McHardy | 972d1cb | 2006-04-06 14:09:12 -0700 | [diff] [blame] | 116 | int nf_register_hooks(struct nf_hook_ops *reg, unsigned int n); |
| 117 | void nf_unregister_hooks(struct nf_hook_ops *reg, unsigned int n); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | |
| 119 | /* Functions to register get/setsockopt ranges (non-inclusive). You |
| 120 | need to check permissions yourself! */ |
| 121 | int nf_register_sockopt(struct nf_sockopt_ops *reg); |
| 122 | void nf_unregister_sockopt(struct nf_sockopt_ops *reg); |
| 123 | |
Jan Engelhardt | 7e9c6ee | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 124 | extern struct list_head nf_hooks[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 126 | #ifdef HAVE_JUMP_LABEL |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 127 | extern struct static_key nf_hooks_needed[NFPROTO_NUMPROTO][NF_MAX_HOOKS]; |
Zhouyi Zhou | d1c85c2 | 2014-08-22 10:40:15 +0800 | [diff] [blame] | 128 | |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 129 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
| 130 | { |
| 131 | if (__builtin_constant_p(pf) && |
| 132 | __builtin_constant_p(hook)) |
Ingo Molnar | c5905af | 2012-02-24 08:31:31 +0100 | [diff] [blame] | 133 | return static_key_false(&nf_hooks_needed[pf][hook]); |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 134 | |
| 135 | return !list_empty(&nf_hooks[pf][hook]); |
| 136 | } |
| 137 | #else |
| 138 | static inline bool nf_hooks_active(u_int8_t pf, unsigned int hook) |
| 139 | { |
| 140 | return !list_empty(&nf_hooks[pf][hook]); |
| 141 | } |
| 142 | #endif |
| 143 | |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 144 | int nf_hook_slow(struct sk_buff *skb, struct nf_hook_state *state); |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 145 | |
| 146 | /** |
| 147 | * nf_hook_thresh - call a netfilter hook |
| 148 | * |
| 149 | * Returns 1 if the hook has allowed the packet to pass. The function |
| 150 | * okfn must be invoked by the caller in this case. Any other return |
| 151 | * value indicates the packet has been consumed by the hook. |
| 152 | */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 153 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 154 | struct sk_buff *skb, |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 155 | struct net_device *indev, |
| 156 | struct net_device *outdev, |
Jan Engelhardt | 23f3733 | 2009-06-05 17:31:46 +0200 | [diff] [blame] | 157 | int (*okfn)(struct sk_buff *), int thresh) |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 158 | { |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 159 | if (nf_hooks_active(pf, hook)) { |
David Miller | 107a9f4 | 2015-04-05 22:18:54 -0400 | [diff] [blame^] | 160 | struct nf_hook_state state; |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 161 | |
David Miller | 107a9f4 | 2015-04-05 22:18:54 -0400 | [diff] [blame^] | 162 | nf_hook_state_init(&state, hook, thresh, pf, |
| 163 | indev, outdev, okfn); |
David S. Miller | cfdfab3 | 2015-04-03 16:23:58 -0400 | [diff] [blame] | 164 | return nf_hook_slow(skb, &state); |
| 165 | } |
Eric Dumazet | a2d7ec5 | 2011-11-18 17:32:46 +0000 | [diff] [blame] | 166 | return 1; |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 167 | } |
| 168 | |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 169 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 170 | struct net_device *indev, struct net_device *outdev, |
| 171 | int (*okfn)(struct sk_buff *)) |
| 172 | { |
Jan Engelhardt | 23f3733 | 2009-06-05 17:31:46 +0200 | [diff] [blame] | 173 | return nf_hook_thresh(pf, hook, skb, indev, outdev, okfn, INT_MIN); |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 174 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | |
| 176 | /* Activate hook; either okfn or kfree_skb called, unless a hook |
| 177 | returns NF_STOLEN (in which case, it's up to the hook to deal with |
| 178 | the consequences). |
| 179 | |
| 180 | Returns -ERRNO if packet dropped. Zero means queued, stolen or |
| 181 | accepted. |
| 182 | */ |
| 183 | |
| 184 | /* RR: |
| 185 | > I don't want nf_hook to return anything because people might forget |
| 186 | > about async and trust the return value to mean "packet was ok". |
| 187 | |
| 188 | AK: |
| 189 | Just document it clearly, then you can expect some sense from kernel |
| 190 | coders :) |
| 191 | */ |
| 192 | |
Jan Engelhardt | 2249065 | 2009-06-13 04:13:26 +0200 | [diff] [blame] | 193 | static inline int |
| 194 | NF_HOOK_THRESH(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
| 195 | struct net_device *in, struct net_device *out, |
| 196 | int (*okfn)(struct sk_buff *), int thresh) |
| 197 | { |
| 198 | int ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, thresh); |
| 199 | if (ret == 1) |
| 200 | ret = okfn(skb); |
| 201 | return ret; |
| 202 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | |
Jan Engelhardt | 2249065 | 2009-06-13 04:13:26 +0200 | [diff] [blame] | 204 | static inline int |
| 205 | NF_HOOK_COND(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
| 206 | struct net_device *in, struct net_device *out, |
| 207 | int (*okfn)(struct sk_buff *), bool cond) |
| 208 | { |
Patrick McHardy | 4bac6b1 | 2010-02-19 08:03:28 +0100 | [diff] [blame] | 209 | int ret; |
| 210 | |
| 211 | if (!cond || |
Eric Paris | ac5aa2e | 2010-11-12 08:26:06 +0100 | [diff] [blame] | 212 | ((ret = nf_hook_thresh(pf, hook, skb, in, out, okfn, INT_MIN)) == 1)) |
Jan Engelhardt | 2249065 | 2009-06-13 04:13:26 +0200 | [diff] [blame] | 213 | ret = okfn(skb); |
| 214 | return ret; |
| 215 | } |
Patrick McHardy | 16a6677 | 2006-01-06 23:01:48 -0800 | [diff] [blame] | 216 | |
Jan Engelhardt | 2249065 | 2009-06-13 04:13:26 +0200 | [diff] [blame] | 217 | static inline int |
| 218 | NF_HOOK(uint8_t pf, unsigned int hook, struct sk_buff *skb, |
| 219 | struct net_device *in, struct net_device *out, |
| 220 | int (*okfn)(struct sk_buff *)) |
| 221 | { |
| 222 | return NF_HOOK_THRESH(pf, hook, skb, in, out, okfn, INT_MIN); |
| 223 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | |
| 225 | /* Call setsockopt() */ |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 226 | int nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 227 | unsigned int len); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 228 | int nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, char __user *opt, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | int *len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 230 | #ifdef CONFIG_COMPAT |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 231 | int compat_nf_setsockopt(struct sock *sk, u_int8_t pf, int optval, |
David S. Miller | b705884 | 2009-09-30 16:12:20 -0700 | [diff] [blame] | 232 | char __user *opt, unsigned int len); |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 233 | int compat_nf_getsockopt(struct sock *sk, u_int8_t pf, int optval, |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 234 | char __user *opt, int *len); |
Alexey Dobriyan | c30f540 | 2010-02-02 15:03:24 +0100 | [diff] [blame] | 235 | #endif |
Dmitry Mishin | 3fdadf7 | 2006-03-20 22:45:21 -0800 | [diff] [blame] | 236 | |
Harald Welte | 089af26 | 2005-08-09 19:37:23 -0700 | [diff] [blame] | 237 | /* Call this before modifying an existing packet: ensures it is |
| 238 | modifiable and linear to the point you care about (writable_len). |
| 239 | Returns true or false. */ |
Joe Perches | a0f4ecf | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 240 | int skb_make_writable(struct sk_buff *skb, unsigned int writable_len); |
Harald Welte | 089af26 | 2005-08-09 19:37:23 -0700 | [diff] [blame] | 241 | |
Patrick McHardy | 1841a4c | 2007-12-05 01:22:05 -0800 | [diff] [blame] | 242 | struct flowi; |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 243 | struct nf_queue_entry; |
Patrick McHardy | c01cd42 | 2007-12-05 01:24:48 -0800 | [diff] [blame] | 244 | |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 245 | struct nf_afinfo { |
| 246 | unsigned short family; |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 247 | __sum16 (*checksum)(struct sk_buff *skb, unsigned int hook, |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 248 | unsigned int dataoff, u_int8_t protocol); |
Patrick McHardy | d63a650 | 2008-03-20 15:15:53 +0100 | [diff] [blame] | 249 | __sum16 (*checksum_partial)(struct sk_buff *skb, |
| 250 | unsigned int hook, |
| 251 | unsigned int dataoff, |
| 252 | unsigned int len, |
| 253 | u_int8_t protocol); |
Florian Westphal | 31ad3dd | 2011-04-04 16:56:29 +0200 | [diff] [blame] | 254 | int (*route)(struct net *net, struct dst_entry **dst, |
Florian Westphal | 0fae2e7 | 2011-04-04 17:00:54 +0200 | [diff] [blame] | 255 | struct flowi *fl, bool strict); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 256 | void (*saveroute)(const struct sk_buff *skb, |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 257 | struct nf_queue_entry *entry); |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 258 | int (*reroute)(struct sk_buff *skb, |
Patrick McHardy | 02f014d | 2007-12-05 01:26:33 -0800 | [diff] [blame] | 259 | const struct nf_queue_entry *entry); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 260 | int route_key_size; |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 261 | }; |
| 262 | |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 263 | extern const struct nf_afinfo __rcu *nf_afinfo[NFPROTO_NUMPROTO]; |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 264 | static inline const struct nf_afinfo *nf_get_afinfo(unsigned short family) |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 265 | { |
| 266 | return rcu_dereference(nf_afinfo[family]); |
| 267 | } |
Harald Welte | 2cc7d57 | 2005-08-09 19:42:34 -0700 | [diff] [blame] | 268 | |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 269 | static inline __sum16 |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 270 | nf_checksum(struct sk_buff *skb, unsigned int hook, unsigned int dataoff, |
| 271 | u_int8_t protocol, unsigned short family) |
| 272 | { |
Patrick McHardy | 1e796fd | 2007-12-17 22:42:27 -0800 | [diff] [blame] | 273 | const struct nf_afinfo *afinfo; |
Al Viro | b51655b | 2006-11-14 21:40:42 -0800 | [diff] [blame] | 274 | __sum16 csum = 0; |
Patrick McHardy | 422c346 | 2006-04-06 14:18:43 -0700 | [diff] [blame] | 275 | |
| 276 | rcu_read_lock(); |
| 277 | afinfo = nf_get_afinfo(family); |
| 278 | if (afinfo) |
| 279 | csum = afinfo->checksum(skb, hook, dataoff, protocol); |
| 280 | rcu_read_unlock(); |
| 281 | return csum; |
| 282 | } |
| 283 | |
Patrick McHardy | d63a650 | 2008-03-20 15:15:53 +0100 | [diff] [blame] | 284 | static inline __sum16 |
| 285 | nf_checksum_partial(struct sk_buff *skb, unsigned int hook, |
| 286 | unsigned int dataoff, unsigned int len, |
| 287 | u_int8_t protocol, unsigned short family) |
| 288 | { |
| 289 | const struct nf_afinfo *afinfo; |
| 290 | __sum16 csum = 0; |
| 291 | |
| 292 | rcu_read_lock(); |
| 293 | afinfo = nf_get_afinfo(family); |
| 294 | if (afinfo) |
| 295 | csum = afinfo->checksum_partial(skb, hook, dataoff, len, |
| 296 | protocol); |
| 297 | rcu_read_unlock(); |
| 298 | return csum; |
| 299 | } |
| 300 | |
Joe Perches | a0f4ecf | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 301 | int nf_register_afinfo(const struct nf_afinfo *afinfo); |
| 302 | void nf_unregister_afinfo(const struct nf_afinfo *afinfo); |
Patrick McHardy | bce8032 | 2006-04-06 14:18:09 -0700 | [diff] [blame] | 303 | |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 304 | #include <net/flow.h> |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 305 | extern void (*nf_nat_decode_session_hook)(struct sk_buff *, struct flowi *); |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 306 | |
| 307 | static inline void |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 308 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 309 | { |
Patrick McHardy | 051578c | 2007-12-17 22:42:51 -0800 | [diff] [blame] | 310 | #ifdef CONFIG_NF_NAT_NEEDED |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 311 | void (*decodefn)(struct sk_buff *, struct flowi *); |
| 312 | |
Patrick McHardy | c7232c9 | 2012-08-26 19:14:06 +0200 | [diff] [blame] | 313 | rcu_read_lock(); |
| 314 | decodefn = rcu_dereference(nf_nat_decode_session_hook); |
| 315 | if (decodefn) |
| 316 | decodefn(skb, fl); |
| 317 | rcu_read_unlock(); |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 318 | #endif |
| 319 | } |
| 320 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | #else /* !CONFIG_NETFILTER */ |
| 322 | #define NF_HOOK(pf, hook, skb, indev, outdev, okfn) (okfn)(skb) |
Patrick McHardy | 48d5cad | 2006-02-15 15:10:22 -0800 | [diff] [blame] | 323 | #define NF_HOOK_COND(pf, hook, skb, indev, outdev, okfn, cond) (okfn)(skb) |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 324 | static inline int nf_hook_thresh(u_int8_t pf, unsigned int hook, |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 325 | struct sk_buff *skb, |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 326 | struct net_device *indev, |
| 327 | struct net_device *outdev, |
Jan Engelhardt | 23f3733 | 2009-06-05 17:31:46 +0200 | [diff] [blame] | 328 | int (*okfn)(struct sk_buff *), int thresh) |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 329 | { |
Herbert Xu | 3db05fe | 2007-10-15 00:53:15 -0700 | [diff] [blame] | 330 | return okfn(skb); |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 331 | } |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 332 | static inline int nf_hook(u_int8_t pf, unsigned int hook, struct sk_buff *skb, |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 333 | struct net_device *indev, struct net_device *outdev, |
| 334 | int (*okfn)(struct sk_buff *)) |
| 335 | { |
Patrick McHardy | 9c92d34 | 2006-02-15 15:18:19 -0800 | [diff] [blame] | 336 | return 1; |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 337 | } |
David S. Miller | f53b61d | 2006-01-07 12:50:27 -0800 | [diff] [blame] | 338 | struct flowi; |
Patrick McHardy | eb9c7eb | 2006-01-06 23:06:30 -0800 | [diff] [blame] | 339 | static inline void |
Jan Engelhardt | 76108ce | 2008-10-08 11:35:00 +0200 | [diff] [blame] | 340 | nf_nat_decode_session(struct sk_buff *skb, struct flowi *fl, u_int8_t family) |
| 341 | { |
| 342 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | #endif /*CONFIG_NETFILTER*/ |
| 344 | |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 345 | #if defined(CONFIG_NF_CONNTRACK) || defined(CONFIG_NF_CONNTRACK_MODULE) |
Patrick McHardy | 312a0c16 | 2013-07-28 22:54:08 +0200 | [diff] [blame] | 346 | extern void (*ip_ct_attach)(struct sk_buff *, const struct sk_buff *) __rcu; |
Joe Perches | a0f4ecf | 2013-09-26 14:48:15 -0700 | [diff] [blame] | 347 | void nf_ct_attach(struct sk_buff *, const struct sk_buff *); |
Eric Dumazet | 0e60ebe | 2010-11-15 18:17:21 +0100 | [diff] [blame] | 348 | extern void (*nf_ct_destroy)(struct nf_conntrack *) __rcu; |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 349 | |
| 350 | struct nf_conn; |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 351 | enum ip_conntrack_info; |
Pablo Neira Ayuso | 9cb0176 | 2012-06-07 12:13:39 +0200 | [diff] [blame] | 352 | struct nlattr; |
| 353 | |
| 354 | struct nfq_ct_hook { |
| 355 | size_t (*build_size)(const struct nf_conn *ct); |
| 356 | int (*build)(struct sk_buff *skb, struct nf_conn *ct); |
| 357 | int (*parse)(const struct nlattr *attr, struct nf_conn *ct); |
Pablo Neira Ayuso | bd07793 | 2013-08-07 18:13:20 +0200 | [diff] [blame] | 358 | int (*attach_expect)(const struct nlattr *attr, struct nf_conn *ct, |
| 359 | u32 portid, u32 report); |
Patrick McHardy | 41d73ec | 2013-08-27 08:50:12 +0200 | [diff] [blame] | 360 | void (*seq_adjust)(struct sk_buff *skb, struct nf_conn *ct, |
| 361 | enum ip_conntrack_info ctinfo, s32 off); |
Pablo Neira Ayuso | d584a61 | 2012-06-20 20:52:31 +0200 | [diff] [blame] | 362 | }; |
| 363 | extern struct nfq_ct_hook __rcu *nfq_ct_hook; |
Yasuyuki Kozakai | 5f79e0f | 2007-03-23 11:17:07 -0700 | [diff] [blame] | 364 | #else |
| 365 | static inline void nf_ct_attach(struct sk_buff *new, struct sk_buff *skb) {} |
| 366 | #endif |
| 367 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | #endif /*__LINUX_NETFILTER_H*/ |