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Linus Torvalds1da177e2005-04-16 15:20:36 -07001#ifndef _NET_XFRM_H
2#define _NET_XFRM_H
3
Herbert Xuaabc9762005-05-03 16:27:10 -07004#include <linux/compiler.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07005#include <linux/xfrm.h>
6#include <linux/spinlock.h>
7#include <linux/list.h>
8#include <linux/skbuff.h>
Arnaldo Carvalho de Melo14c85022005-12-27 02:43:12 -02009#include <linux/socket.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070010#include <linux/pfkeyv2.h>
Masahide NAKAMURA57947082006-09-22 15:06:24 -070011#include <linux/ipsec.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070012#include <linux/in6.h>
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080013#include <linux/mutex.h>
Joy Lattenab5f5e82007-09-17 11:51:22 -070014#include <linux/audit.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015
16#include <net/sock.h>
17#include <net/dst.h>
Herbert Xu436a0a42007-10-08 17:25:53 -070018#include <net/ip.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <net/route.h>
20#include <net/ipv6.h>
21#include <net/ip6_fib.h>
Yury Polyanskiy9e0d57f2009-11-08 20:58:41 -080022
23#include <linux/interrupt.h>
24
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080025#ifdef CONFIG_XFRM_STATISTICS
26#include <net/snmp.h>
27#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070029#define XFRM_PROTO_ESP 50
30#define XFRM_PROTO_AH 51
31#define XFRM_PROTO_COMP 108
32#define XFRM_PROTO_IPIP 4
33#define XFRM_PROTO_IPV6 41
34#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
35#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
Herbert Xub59f45d2006-05-27 23:05:54 -070038#define MODULE_ALIAS_XFRM_MODE(family, encap) \
39 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070040#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
41 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080043#ifdef CONFIG_XFRM_STATISTICS
Alexey Dobriyan59c99402008-11-25 17:59:52 -080044#define XFRM_INC_STATS(net, field) SNMP_INC_STATS((net)->mib.xfrm_statistics, field)
45#define XFRM_INC_STATS_BH(net, field) SNMP_INC_STATS_BH((net)->mib.xfrm_statistics, field)
46#define XFRM_INC_STATS_USER(net, field) SNMP_INC_STATS_USER((net)-mib.xfrm_statistics, field)
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080047#else
Alexey Dobriyan59c99402008-11-25 17:59:52 -080048#define XFRM_INC_STATS(net, field) ((void)(net))
49#define XFRM_INC_STATS_BH(net, field) ((void)(net))
50#define XFRM_INC_STATS_USER(net, field) ((void)(net))
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080051#endif
52
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080053extern struct mutex xfrm_cfg_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/* Organization of SPD aka "XFRM rules"
56 ------------------------------------
57
58 Basic objects:
59 - policy rule, struct xfrm_policy (=SPD entry)
60 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
61 - instance of a transformer, struct xfrm_state (=SA)
62 - template to clone xfrm_state, struct xfrm_tmpl
63
64 SPD is plain linear list of xfrm_policy rules, ordered by priority.
65 (To be compatible with existing pfkeyv2 implementations,
66 many rules with priority of 0x7fffffff are allowed to exist and
67 such rules are ordered in an unpredictable way, thanks to bsd folks.)
68
69 Lookup is plain linear search until the first match with selector.
70
71 If "action" is "block", then we prohibit the flow, otherwise:
72 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
73 policy entry has list of up to XFRM_MAX_DEPTH transformations,
74 described by templates xfrm_tmpl. Each template is resolved
75 to a complete xfrm_state (see below) and we pack bundle of transformations
76 to a dst_entry returned to requestor.
77
78 dst -. xfrm .-> xfrm_state #1
79 |---. child .-> dst -. xfrm .-> xfrm_state #2
80 |---. child .-> dst -. xfrm .-> xfrm_state #3
81 |---. child .-> NULL
82
83 Bundles are cached at xrfm_policy struct (field ->bundles).
84
85
86 Resolution of xrfm_tmpl
87 -----------------------
88 Template contains:
89 1. ->mode Mode: transport or tunnel
90 2. ->id.proto Protocol: AH/ESP/IPCOMP
91 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
92 Q: allow to resolve security gateway?
93 4. ->id.spi If not zero, static SPI.
94 5. ->saddr Local tunnel endpoint, ignored for transport mode.
95 6. ->algos List of allowed algos. Plain bitmask now.
96 Q: ealgos, aalgos, calgos. What a mess...
97 7. ->share Sharing mode.
98 Q: how to implement private sharing mode? To add struct sock* to
99 flow id?
100
101 Having this template we search through SAD searching for entries
102 with appropriate mode/proto/algo, permitted by selector.
103 If no appropriate entry found, it is requested from key manager.
104
105 PROBLEMS:
106 Q: How to find all the bundles referring to a physical path for
107 PMTU discovery? Seems, dst should contain list of all parents...
108 and enter to infinite locking hierarchy disaster.
109 No! It is easier, we will not search for them, let them find us.
110 We add genid to each dst plus pointer to genid of raw IP route,
111 pmtu disc will update pmtu on raw IP route and increase its genid.
112 dst_check() will see this for top level and trigger resyncing
113 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
114 */
115
Herbert Xu12a169e2008-10-01 07:03:24 -0700116struct xfrm_state_walk {
117 struct list_head all;
118 u8 state;
119 union {
120 u8 dying;
121 u8 proto;
122 };
123 u32 seq;
124};
125
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126/* Full description of state of transformer. */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000127struct xfrm_state {
Alexey Dobriyan673c09b2008-11-25 17:15:16 -0800128#ifdef CONFIG_NET_NS
129 struct net *xs_net;
130#endif
Herbert Xuabb81c42008-09-09 19:58:29 -0700131 union {
Herbert Xu12a169e2008-10-01 07:03:24 -0700132 struct hlist_node gclist;
Herbert Xuabb81c42008-09-09 19:58:29 -0700133 struct hlist_node bydst;
134 };
David S. Miller8f126e32006-08-24 02:45:07 -0700135 struct hlist_node bysrc;
136 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 atomic_t refcnt;
139 spinlock_t lock;
140
141 struct xfrm_id id;
142 struct xfrm_selector sel;
143
David S. Miller9d4a7062006-08-24 03:18:09 -0700144 u32 genid;
145
Herbert Xu12a169e2008-10-01 07:03:24 -0700146 /* Key manager bits */
147 struct xfrm_state_walk km;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 /* Parameters of this state. */
150 struct {
151 u32 reqid;
152 u8 mode;
153 u8 replay_window;
154 u8 aalgo, ealgo, calgo;
155 u8 flags;
156 u16 family;
157 xfrm_address_t saddr;
158 int header_len;
159 int trailer_len;
160 } props;
161
162 struct xfrm_lifetime_cfg lft;
163
164 /* Data for transformer */
Martin Willi4447bb32009-11-25 00:29:52 +0000165 struct xfrm_algo_auth *aalg;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 struct xfrm_algo *ealg;
167 struct xfrm_algo *calg;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800168 struct xfrm_algo_aead *aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169
170 /* Data for encapsulator */
171 struct xfrm_encap_tmpl *encap;
172
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700173 /* Data for care-of address */
174 xfrm_address_t *coaddr;
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
177 struct xfrm_state *tunnel;
178
179 /* If a tunnel, number of users + 1 */
180 atomic_t tunnel_users;
181
182 /* State for replay detection */
183 struct xfrm_replay_state replay;
184
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800185 /* Replay detection state at the time we sent the last notification */
186 struct xfrm_replay_state preplay;
187
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700188 /* internal flag that only holds state for delayed aevent at the
189 * moment
190 */
191 u32 xflags;
192
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800193 /* Replay detection notification settings */
194 u32 replay_maxage;
195 u32 replay_maxdiff;
196
197 /* Replay detection notification timer */
198 struct timer_list rtimer;
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 /* Statistics */
201 struct xfrm_stats stats;
202
203 struct xfrm_lifetime_cur curlft;
Yury Polyanskiy9e0d57f2009-11-08 20:58:41 -0800204 struct tasklet_hrtimer mtimer;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700206 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800207 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /* Reference to data common to all the instances of this
210 * transformer. */
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800211 const struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700212 struct xfrm_mode *inner_mode;
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700213 struct xfrm_mode *inner_mode_iaf;
Herbert Xu13996372007-10-17 21:35:51 -0700214 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
Trent Jaegerdf718372005-12-13 23:12:27 -0800216 /* Security context */
217 struct xfrm_sec_ctx *security;
218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 /* Private data of this transformer, format is opaque,
220 * interpreted by xfrm_type methods. */
221 void *data;
222};
223
Alexey Dobriyan673c09b2008-11-25 17:15:16 -0800224static inline struct net *xs_net(struct xfrm_state *x)
225{
226 return read_pnet(&x->xs_net);
227}
228
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700229/* xflags - make enum if more show up */
230#define XFRM_TIME_DEFER 1
231
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232enum {
233 XFRM_STATE_VOID,
234 XFRM_STATE_ACQ,
235 XFRM_STATE_VALID,
236 XFRM_STATE_ERROR,
237 XFRM_STATE_EXPIRED,
238 XFRM_STATE_DEAD
239};
240
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700241/* callback structure passed from either netlink or pfkey */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000242struct km_event {
Herbert Xubf088672005-06-18 22:44:00 -0700243 union {
244 u32 hard;
245 u32 proto;
246 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800247 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700248 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700249 } data;
250
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700251 u32 seq;
252 u32 pid;
253 u32 event;
Alexey Dobriyan70678022008-11-25 17:50:36 -0800254 struct net *net;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700255};
256
Herbert Xu25ee3282007-12-11 09:32:34 -0800257struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258struct xfrm_type;
259struct xfrm_dst;
260struct xfrm_policy_afinfo {
261 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 struct dst_ops *dst_ops;
Alexey Dobriyanddcfd792008-11-25 17:37:23 -0800263 void (*garbage_collect)(struct net *net);
Alexey Dobriyanc5b3cf42008-11-25 17:51:25 -0800264 struct dst_entry *(*dst_lookup)(struct net *net, int tos,
265 xfrm_address_t *saddr,
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800266 xfrm_address_t *daddr);
Alexey Dobriyanfbda33b2008-11-25 17:56:49 -0800267 int (*get_saddr)(struct net *net, xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 void (*decode_session)(struct sk_buff *skb,
Herbert Xud5422ef2007-12-12 10:44:16 -0800270 struct flowi *fl,
271 int reverse);
Herbert Xu25ee3282007-12-11 09:32:34 -0800272 int (*get_tos)(struct flowi *fl);
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800273 int (*init_path)(struct xfrm_dst *path,
274 struct dst_entry *dst,
275 int nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -0800276 int (*fill_dst)(struct xfrm_dst *xdst,
277 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278};
279
280extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
281extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700282extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
283extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
285struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800286extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800287extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
288extern int __xfrm_state_delete(struct xfrm_state *x);
289
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700291 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800292 unsigned int proto;
Al Viro8e3d7162008-03-17 22:49:16 -0700293 __be16 eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700294 struct module *owner;
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800295 const struct xfrm_type *type_map[IPPROTO_MAX];
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700296 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700297 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
299 struct xfrm_tmpl *tmpl,
300 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700301 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
302 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800303 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800304 int (*extract_input)(struct xfrm_state *x,
305 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800306 int (*extract_output)(struct xfrm_state *x,
307 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800308 int (*transport_finish)(struct sk_buff *skb,
309 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310};
311
312extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
313extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
314
315extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
316
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000317struct xfrm_type {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 char *description;
319 struct module *owner;
320 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700321 __u8 flags;
322#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700323#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800324#define XFRM_TYPE_LOCAL_COADDR 4
325#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Herbert Xu72cb6962005-06-20 13:18:08 -0700327 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800329 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700331 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700332 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700334 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335};
336
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800337extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
338extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Herbert Xub59f45d2006-05-27 23:05:54 -0700340struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800341 /*
342 * Remove encapsulation header.
343 *
344 * The IP header will be moved over the top of the encapsulation
345 * header.
346 *
347 * On entry, the transport header shall point to where the IP header
348 * should be and the network header shall be set to where the IP
349 * header currently is. skb->data shall point to the start of the
350 * payload.
351 */
352 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
353
354 /*
355 * This is the actual input entry point.
356 *
357 * For transport mode and equivalent this would be identical to
358 * input2 (which does not need to be set). While tunnel mode
359 * and equivalent would set this to the tunnel encapsulation function
360 * xfrm4_prepare_input that would in turn call input2.
361 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700362 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700363
364 /*
365 * Add encapsulation header.
366 *
367 * On exit, the transport header will be set to the start of the
368 * encapsulation header to be filled in by x->type->output and
369 * the mac header will be set to the nextheader (protocol for
370 * IPv4) field of the extension header directly preceding the
371 * encapsulation header, or in its absence, that of the top IP
372 * header. The value of the network header will always point
373 * to the top IP header while skb->data will point to the payload.
374 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800375 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
376
377 /*
378 * This is the actual output entry point.
379 *
380 * For transport mode and equivalent this would be identical to
381 * output2 (which does not need to be set). While tunnel mode
382 * and equivalent would set this to a tunnel encapsulation function
383 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
384 * call output2.
385 */
386 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700387
Herbert Xu17c2a422007-10-17 21:33:12 -0700388 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700389 struct module *owner;
390 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700391 int flags;
392};
393
394/* Flags for xfrm_mode. */
395enum {
396 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700397};
398
399extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
400extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700401
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700402static inline int xfrm_af2proto(unsigned int family)
403{
404 switch(family) {
405 case AF_INET:
406 return IPPROTO_IPIP;
407 case AF_INET6:
408 return IPPROTO_IPV6;
409 default:
410 return 0;
411 }
412}
413
414static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
415{
416 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
417 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
418 return x->inner_mode;
419 else
420 return x->inner_mode_iaf;
421}
422
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000423struct xfrm_tmpl {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424/* id in template is interpreted as:
425 * daddr - destination of tunnel, may be zero for transport mode.
426 * spi - zero to acquire spi. Not zero if spi is static, then
427 * daddr must be fixed too.
428 * proto - AH/ESP/IPCOMP
429 */
430 struct xfrm_id id;
431
432/* Source address of tunnel. Ignored, if it is not a tunnel. */
433 xfrm_address_t saddr;
434
Miika Komu76b3f052006-11-30 16:40:43 -0800435 unsigned short encap_family;
436
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 __u32 reqid;
438
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700439/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440 __u8 mode;
441
442/* Sharing mode: unique, this session only, this user only etc. */
443 __u8 share;
444
445/* May skip this transfomration if no SA is found */
446 __u8 optional;
447
Herbert Xuc5d18e92008-04-22 00:46:42 -0700448/* Skip aalgos/ealgos/calgos checks. */
449 __u8 allalgs;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451/* Bit mask of algos allowed for acquisition */
452 __u32 aalgos;
453 __u32 ealgos;
454 __u32 calgos;
455};
456
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700457#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458
Herbert Xu12a169e2008-10-01 07:03:24 -0700459struct xfrm_policy_walk_entry {
460 struct list_head all;
461 u8 dead;
462};
463
464struct xfrm_policy_walk {
465 struct xfrm_policy_walk_entry walk;
466 u8 type;
467 u32 seq;
468};
469
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000470struct xfrm_policy {
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800471#ifdef CONFIG_NET_NS
472 struct net *xp_net;
473#endif
David S. Miller2518c7c2006-08-24 04:45:07 -0700474 struct hlist_node bydst;
475 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476
477 /* This lock only affects elements except for entry. */
478 rwlock_t lock;
479 atomic_t refcnt;
480 struct timer_list timer;
481
482 u32 priority;
483 u32 index;
484 struct xfrm_selector selector;
485 struct xfrm_lifetime_cfg lft;
486 struct xfrm_lifetime_cur curlft;
487 struct dst_entry *bundles;
Herbert Xu12a169e2008-10-01 07:03:24 -0700488 struct xfrm_policy_walk_entry walk;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200489 u8 type;
490 u8 action;
491 u8 flags;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200492 u8 xfrm_nr;
Herbert Xu12a169e2008-10-01 07:03:24 -0700493 u16 family;
Trent Jaegerdf718372005-12-13 23:12:27 -0800494 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
496};
497
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -0800498static inline struct net *xp_net(struct xfrm_policy *xp)
499{
500 return read_pnet(&xp->xp_net);
501}
502
Arnaud Ebalard13c1d182008-10-05 13:33:42 -0700503struct xfrm_kmaddress {
504 xfrm_address_t local;
505 xfrm_address_t remote;
506 u32 reserved;
507 u16 family;
508};
509
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800510struct xfrm_migrate {
511 xfrm_address_t old_daddr;
512 xfrm_address_t old_saddr;
513 xfrm_address_t new_daddr;
514 xfrm_address_t new_saddr;
515 u8 proto;
516 u8 mode;
517 u16 reserved;
518 u32 reqid;
519 u16 old_family;
520 u16 new_family;
521};
522
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800523#define XFRM_KM_TIMEOUT 30
524/* which seqno */
525#define XFRM_REPLAY_SEQ 1
526#define XFRM_REPLAY_OSEQ 2
527#define XFRM_REPLAY_SEQ_MASK 3
528/* what happened */
529#define XFRM_REPLAY_UPDATE XFRM_AE_CR
530#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
531
532/* default aevent timeout in units of 100ms */
533#define XFRM_AE_ETIME 10
534/* Async Event timer multiplier */
535#define XFRM_AE_ETH_M 10
536/* default seq threshold size */
537#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700538
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000539struct xfrm_mgr {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 struct list_head list;
541 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700542 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700543 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700544 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800545 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700546 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Alexey Dobriyandb983c12008-11-25 17:51:01 -0800547 int (*report)(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Arnaud Ebalard13c1d182008-10-05 13:33:42 -0700548 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles, struct xfrm_kmaddress *k);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549};
550
551extern int xfrm_register_km(struct xfrm_mgr *km);
552extern int xfrm_unregister_km(struct xfrm_mgr *km);
553
Herbert Xu436a0a42007-10-08 17:25:53 -0700554/*
555 * This structure is used for the duration where packets are being
556 * transformed by IPsec. As soon as the packet leaves IPsec the
557 * area beyond the generic IP part may be overwritten.
558 */
559struct xfrm_skb_cb {
560 union {
561 struct inet_skb_parm h4;
562 struct inet6_skb_parm h6;
563 } header;
564
565 /* Sequence number for replay protection. */
Herbert Xub318e0e2008-02-12 22:50:35 -0800566 union {
567 u64 output;
568 __be32 input;
569 } seq;
Herbert Xu436a0a42007-10-08 17:25:53 -0700570};
571
572#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
573
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800574/*
575 * This structure is used by the afinfo prepare_input/prepare_output functions
576 * to transmit header information to the mode input/output functions.
577 */
578struct xfrm_mode_skb_cb {
579 union {
580 struct inet_skb_parm h4;
581 struct inet6_skb_parm h6;
582 } header;
583
584 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
585 __be16 id;
586 __be16 frag_off;
587
Herbert Xu732c8bd2008-03-26 16:51:09 -0700588 /* IP header length (excluding options or extension headers). */
589 u8 ihl;
590
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800591 /* TOS for IPv4, class for IPv6. */
592 u8 tos;
593
594 /* TTL for IPv4, hop limitfor IPv6. */
595 u8 ttl;
596
597 /* Protocol for IPv4, NH for IPv6. */
598 u8 protocol;
599
Herbert Xu732c8bd2008-03-26 16:51:09 -0700600 /* Option length for IPv4, zero for IPv6. */
601 u8 optlen;
602
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800603 /* Used by IPv6 only, zero for IPv4. */
604 u8 flow_lbl[3];
605};
606
607#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
608
Herbert Xu716062f2007-11-13 21:44:23 -0800609/*
610 * This structure is used by the input processing to locate the SPI and
611 * related information.
612 */
613struct xfrm_spi_skb_cb {
614 union {
615 struct inet_skb_parm h4;
616 struct inet6_skb_parm h6;
617 } header;
618
Herbert Xu716062f2007-11-13 21:44:23 -0800619 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800620 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800621};
622
623#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
624
Joy Latten161a09e2006-11-27 13:11:54 -0600625/* Audit Information */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000626struct xfrm_audit {
Joy Latten161a09e2006-11-27 13:11:54 -0600627 u32 secid;
Eric Paris25323862008-04-18 10:09:25 -0400628 uid_t loginuid;
629 u32 sessionid;
Joy Latten161a09e2006-11-27 13:11:54 -0600630};
Joy Lattenc9204d92006-11-30 15:50:43 -0600631
632#ifdef CONFIG_AUDITSYSCALL
Paul Mooreafeb14b2007-12-21 14:58:11 -0800633static inline struct audit_buffer *xfrm_audit_start(const char *op)
Joy Lattenab5f5e82007-09-17 11:51:22 -0700634{
635 struct audit_buffer *audit_buf = NULL;
Paul Mooreafeb14b2007-12-21 14:58:11 -0800636
637 if (audit_enabled == 0)
638 return NULL;
639 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
640 AUDIT_MAC_IPSEC_EVENT);
641 if (audit_buf == NULL)
642 return NULL;
643 audit_log_format(audit_buf, "op=%s", op);
644 return audit_buf;
645}
646
Eric Paris25323862008-04-18 10:09:25 -0400647static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
Paul Mooreafeb14b2007-12-21 14:58:11 -0800648 struct audit_buffer *audit_buf)
649{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700650 char *secctx;
651 u32 secctx_len;
652
Eric Paris25323862008-04-18 10:09:25 -0400653 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
Paul Moore68277ac2007-12-20 20:49:33 -0800654 if (secid != 0 &&
655 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700656 audit_log_format(audit_buf, " subj=%s", secctx);
657 security_release_secctx(secctx, secctx_len);
658 } else
659 audit_log_task_context(audit_buf);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700660}
661
662extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400663 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700664extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400665 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700666extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400667 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700668extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400669 u32 auid, u32 ses, u32 secid);
Paul Mooreafeb14b2007-12-21 14:58:11 -0800670extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
671 struct sk_buff *skb);
672extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
673extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
674 __be32 net_spi, __be32 net_seq);
675extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
676 struct sk_buff *skb, u8 proto);
Joy Lattenc9204d92006-11-30 15:50:43 -0600677#else
Marcin Slusarz41fef0e2008-05-03 21:03:01 -0700678
679static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
680 u32 auid, u32 ses, u32 secid)
681{
682}
683
684static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
685 u32 auid, u32 ses, u32 secid)
686{
687}
688
689static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
690 u32 auid, u32 ses, u32 secid)
691{
692}
693
694static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
695 u32 auid, u32 ses, u32 secid)
696{
697}
698
699static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
700 struct sk_buff *skb)
701{
702}
703
704static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
705 u16 family)
706{
707}
708
709static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
710 __be32 net_spi, __be32 net_seq)
711{
712}
713
714static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
715 struct sk_buff *skb, u8 proto)
716{
717}
Joy Lattenc9204d92006-11-30 15:50:43 -0600718#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600719
Linus Torvalds1da177e2005-04-16 15:20:36 -0700720static inline void xfrm_pol_hold(struct xfrm_policy *policy)
721{
722 if (likely(policy != NULL))
723 atomic_inc(&policy->refcnt);
724}
725
WANG Cong64c31b32008-01-07 22:34:29 -0800726extern void xfrm_policy_destroy(struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700727
728static inline void xfrm_pol_put(struct xfrm_policy *policy)
729{
730 if (atomic_dec_and_test(&policy->refcnt))
WANG Cong64c31b32008-01-07 22:34:29 -0800731 xfrm_policy_destroy(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732}
733
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700734#ifdef CONFIG_XFRM_SUB_POLICY
735static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
736{
737 int i;
738 for (i = npols - 1; i >= 0; --i)
739 xfrm_pol_put(pols[i]);
740}
741#else
742static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
743{
744 xfrm_pol_put(pols[0]);
745}
746#endif
747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748extern void __xfrm_state_destroy(struct xfrm_state *);
749
Herbert Xu21380b82006-02-22 14:47:13 -0800750static inline void __xfrm_state_put(struct xfrm_state *x)
751{
752 atomic_dec(&x->refcnt);
753}
754
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755static inline void xfrm_state_put(struct xfrm_state *x)
756{
757 if (atomic_dec_and_test(&x->refcnt))
758 __xfrm_state_destroy(x);
759}
760
761static inline void xfrm_state_hold(struct xfrm_state *x)
762{
763 atomic_inc(&x->refcnt);
764}
765
766static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
767{
Al Viro5f193432006-09-27 18:46:32 -0700768 __be32 *a1 = token1;
769 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770 int pdw;
771 int pbi;
772
773 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
774 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
775
776 if (pdw)
777 if (memcmp(a1, a2, pdw << 2))
778 return 0;
779
780 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700781 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782
783 mask = htonl((0xffffffff) << (32 - pbi));
784
785 if ((a1[pdw] ^ a2[pdw]) & mask)
786 return 0;
787 }
788
789 return 1;
790}
791
792static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700793__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794{
Al Virof9d07e41f82006-09-27 18:45:50 -0700795 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 switch(fl->proto) {
797 case IPPROTO_TCP:
798 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800799 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 case IPPROTO_SCTP:
801 port = fl->fl_ip_sport;
802 break;
803 case IPPROTO_ICMP:
804 case IPPROTO_ICMPV6:
805 port = htons(fl->fl_icmp_type);
806 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700807 case IPPROTO_MH:
808 port = htons(fl->fl_mh_type);
809 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 default:
811 port = 0; /*XXX*/
812 }
813 return port;
814}
815
816static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700817__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818{
Al Virof9d07e41f82006-09-27 18:45:50 -0700819 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 switch(fl->proto) {
821 case IPPROTO_TCP:
822 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800823 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 case IPPROTO_SCTP:
825 port = fl->fl_ip_dport;
826 break;
827 case IPPROTO_ICMP:
828 case IPPROTO_ICMPV6:
829 port = htons(fl->fl_icmp_code);
830 break;
831 default:
832 port = 0; /*XXX*/
833 }
834 return port;
835}
836
Andrew Morton77681022006-11-08 22:46:26 -0800837extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
838 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839
Trent Jaegerdf718372005-12-13 23:12:27 -0800840#ifdef CONFIG_SECURITY_NETWORK_XFRM
841/* If neither has a context --> match
842 * Otherwise, both must have a context and the sids, doi, alg must match
843 */
844static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
845{
846 return ((!s1 && !s2) ||
847 (s1 && s2 &&
848 (s1->ctx_sid == s2->ctx_sid) &&
849 (s1->ctx_doi == s2->ctx_doi) &&
850 (s1->ctx_alg == s2->ctx_alg)));
851}
852#else
853static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
854{
855 return 1;
856}
857#endif
858
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859/* A struct encoding bundle of transformations to apply to some set of flow.
860 *
861 * dst->child points to the next element of bundle.
862 * dst->xfrm points to an instanse of transformer.
863 *
864 * Due to unfortunate limitations of current routing cache, which we
865 * have no time to fix, it mirrors struct rtable and bound to the same
866 * routing key, including saddr,daddr. However, we can have many of
867 * bundles differing by session id. All the bundles grow from a parent
868 * policy rule.
869 */
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000870struct xfrm_dst {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 struct dst_entry dst;
873 struct rtable rt;
874 struct rt6_info rt6;
875 } u;
876 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700877#ifdef CONFIG_XFRM_SUB_POLICY
878 struct flowi *origin;
879 struct xfrm_selector *partner;
880#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700881 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882 u32 route_mtu_cached;
883 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63de2005-05-26 12:58:04 -0700884 u32 route_cookie;
885 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886};
887
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -0700888#ifdef CONFIG_XFRM
Herbert Xuaabc9762005-05-03 16:27:10 -0700889static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
890{
891 dst_release(xdst->route);
892 if (likely(xdst->u.dst.xfrm))
893 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700894#ifdef CONFIG_XFRM_SUB_POLICY
895 kfree(xdst->origin);
896 xdst->origin = NULL;
897 kfree(xdst->partner);
898 xdst->partner = NULL;
899#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700900}
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -0700901#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700902
903extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
904
Eric Dumazetfd2c3ef2009-11-03 03:26:03 +0000905struct sec_path {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 atomic_t refcnt;
907 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800908 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700909};
910
911static inline struct sec_path *
912secpath_get(struct sec_path *sp)
913{
914 if (sp)
915 atomic_inc(&sp->refcnt);
916 return sp;
917}
918
919extern void __secpath_destroy(struct sec_path *sp);
920
921static inline void
922secpath_put(struct sec_path *sp)
923{
924 if (sp && atomic_dec_and_test(&sp->refcnt))
925 __secpath_destroy(sp);
926}
927
928extern struct sec_path *secpath_dup(struct sec_path *src);
929
930static inline void
931secpath_reset(struct sk_buff *skb)
932{
933#ifdef CONFIG_XFRM
934 secpath_put(skb->sp);
935 skb->sp = NULL;
936#endif
937}
938
939static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700940xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
941{
942 switch (family) {
943 case AF_INET:
944 return addr->a4 == 0;
945 case AF_INET6:
946 return ipv6_addr_any((struct in6_addr *)&addr->a6);
947 }
948 return 0;
949}
950
951static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
953{
954 return (tmpl->saddr.a4 &&
955 tmpl->saddr.a4 != x->props.saddr.a4);
956}
957
958static inline int
959__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
960{
961 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
962 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
963}
964
965static inline int
966xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
967{
968 switch (family) {
969 case AF_INET:
970 return __xfrm4_state_addr_cmp(tmpl, x);
971 case AF_INET6:
972 return __xfrm6_state_addr_cmp(tmpl, x);
973 }
974 return !0;
975}
976
977#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
979
Herbert Xud5422ef2007-12-12 10:44:16 -0800980static inline int __xfrm_policy_check2(struct sock *sk, int dir,
981 struct sk_buff *skb,
982 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983{
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -0800984 struct net *net = dev_net(skb->dev);
Herbert Xud5422ef2007-12-12 10:44:16 -0800985 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
986
Linus Torvalds1da177e2005-04-16 15:20:36 -0700987 if (sk && sk->sk_policy[XFRM_POLICY_IN])
Herbert Xud5422ef2007-12-12 10:44:16 -0800988 return __xfrm_policy_check(sk, ndir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700989
Alexey Dobriyanf6e1e252008-11-25 17:35:44 -0800990 return (!net->xfrm.policy_count[dir] && !skb->sp) ||
Eric Dumazetadf30902009-06-02 05:19:30 +0000991 (skb_dst(skb)->flags & DST_NOPOLICY) ||
Herbert Xud5422ef2007-12-12 10:44:16 -0800992 __xfrm_policy_check(sk, ndir, skb, family);
993}
994
995static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
996{
997 return __xfrm_policy_check2(sk, dir, skb, family, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998}
999
1000static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1001{
1002 return xfrm_policy_check(sk, dir, skb, AF_INET);
1003}
1004
1005static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1006{
1007 return xfrm_policy_check(sk, dir, skb, AF_INET6);
1008}
1009
Herbert Xud5422ef2007-12-12 10:44:16 -08001010static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1011 struct sk_buff *skb)
1012{
1013 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
1014}
1015
1016static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1017 struct sk_buff *skb)
1018{
1019 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
1020}
1021
1022extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1023 unsigned int family, int reverse);
1024
1025static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
1026 unsigned int family)
1027{
1028 return __xfrm_decode_session(skb, fl, family, 0);
1029}
1030
1031static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1032 struct flowi *fl,
1033 unsigned int family)
1034{
1035 return __xfrm_decode_session(skb, fl, family, 1);
1036}
1037
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1039
1040static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1041{
Alexey Dobriyan99a66652008-11-25 17:36:13 -08001042 struct net *net = dev_net(skb->dev);
1043
1044 return !net->xfrm.policy_count[XFRM_POLICY_OUT] ||
Eric Dumazetadf30902009-06-02 05:19:30 +00001045 (skb_dst(skb)->flags & DST_NOXFRM) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 __xfrm_route_forward(skb, family);
1047}
1048
1049static inline int xfrm4_route_forward(struct sk_buff *skb)
1050{
1051 return xfrm_route_forward(skb, AF_INET);
1052}
1053
1054static inline int xfrm6_route_forward(struct sk_buff *skb)
1055{
1056 return xfrm_route_forward(skb, AF_INET6);
1057}
1058
1059extern int __xfrm_sk_clone_policy(struct sock *sk);
1060
1061static inline int xfrm_sk_clone_policy(struct sock *sk)
1062{
1063 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1064 return __xfrm_sk_clone_policy(sk);
1065 return 0;
1066}
1067
Herbert Xu4666faa2005-06-18 22:43:22 -07001068extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001069
1070static inline void xfrm_sk_free_policy(struct sock *sk)
1071{
1072 if (unlikely(sk->sk_policy[0] != NULL)) {
1073 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1074 sk->sk_policy[0] = NULL;
1075 }
1076 if (unlikely(sk->sk_policy[1] != NULL)) {
1077 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1078 sk->sk_policy[1] = NULL;
1079 }
1080}
1081
1082#else
1083
1084static inline void xfrm_sk_free_policy(struct sock *sk) {}
1085static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1086static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1087static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1088static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1089{
1090 return 1;
1091}
1092static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1093{
1094 return 1;
1095}
1096static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1097{
1098 return 1;
1099}
Herbert Xud5422ef2007-12-12 10:44:16 -08001100static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1101 struct flowi *fl,
1102 unsigned int family)
1103{
1104 return -ENOSYS;
1105}
1106static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1107 struct sk_buff *skb)
1108{
1109 return 1;
1110}
1111static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1112 struct sk_buff *skb)
1113{
1114 return 1;
1115}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001116#endif
1117
1118static __inline__
1119xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1120{
1121 switch (family){
1122 case AF_INET:
1123 return (xfrm_address_t *)&fl->fl4_dst;
1124 case AF_INET6:
1125 return (xfrm_address_t *)&fl->fl6_dst;
1126 }
1127 return NULL;
1128}
1129
1130static __inline__
1131xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1132{
1133 switch (family){
1134 case AF_INET:
1135 return (xfrm_address_t *)&fl->fl4_src;
1136 case AF_INET6:
1137 return (xfrm_address_t *)&fl->fl6_src;
1138 }
1139 return NULL;
1140}
1141
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001142static __inline__
1143void xfrm_flowi_addr_get(struct flowi *fl,
1144 xfrm_address_t *saddr, xfrm_address_t *daddr,
1145 unsigned short family)
1146{
1147 switch(family) {
1148 case AF_INET:
1149 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1150 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1151 break;
1152 case AF_INET6:
1153 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1154 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1155 break;
1156 }
1157}
1158
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159static __inline__ int
1160__xfrm4_state_addr_check(struct xfrm_state *x,
1161 xfrm_address_t *daddr, xfrm_address_t *saddr)
1162{
1163 if (daddr->a4 == x->id.daddr.a4 &&
1164 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1165 return 1;
1166 return 0;
1167}
1168
1169static __inline__ int
1170__xfrm6_state_addr_check(struct xfrm_state *x,
1171 xfrm_address_t *daddr, xfrm_address_t *saddr)
1172{
1173 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1174 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1175 ipv6_addr_any((struct in6_addr *)saddr) ||
1176 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1177 return 1;
1178 return 0;
1179}
1180
1181static __inline__ int
1182xfrm_state_addr_check(struct xfrm_state *x,
1183 xfrm_address_t *daddr, xfrm_address_t *saddr,
1184 unsigned short family)
1185{
1186 switch (family) {
1187 case AF_INET:
1188 return __xfrm4_state_addr_check(x, daddr, saddr);
1189 case AF_INET6:
1190 return __xfrm6_state_addr_check(x, daddr, saddr);
1191 }
1192 return 0;
1193}
1194
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07001195static __inline__ int
1196xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1197 unsigned short family)
1198{
1199 switch (family) {
1200 case AF_INET:
1201 return __xfrm4_state_addr_check(x,
1202 (xfrm_address_t *)&fl->fl4_dst,
1203 (xfrm_address_t *)&fl->fl4_src);
1204 case AF_INET6:
1205 return __xfrm6_state_addr_check(x,
1206 (xfrm_address_t *)&fl->fl6_dst,
1207 (xfrm_address_t *)&fl->fl6_src);
1208 }
1209 return 0;
1210}
1211
Linus Torvalds1da177e2005-04-16 15:20:36 -07001212static inline int xfrm_state_kern(struct xfrm_state *x)
1213{
1214 return atomic_read(&x->tunnel_users);
1215}
1216
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001217static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1218{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001219 return (!userproto || proto == userproto ||
1220 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1221 proto == IPPROTO_ESP ||
1222 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001223}
1224
Linus Torvalds1da177e2005-04-16 15:20:36 -07001225/*
1226 * xfrm algorithm information
1227 */
Herbert Xu1a6509d2008-01-28 19:37:29 -08001228struct xfrm_algo_aead_info {
1229 u16 icv_truncbits;
1230};
1231
Linus Torvalds1da177e2005-04-16 15:20:36 -07001232struct xfrm_algo_auth_info {
1233 u16 icv_truncbits;
1234 u16 icv_fullbits;
1235};
1236
1237struct xfrm_algo_encr_info {
1238 u16 blockbits;
1239 u16 defkeybits;
1240};
1241
1242struct xfrm_algo_comp_info {
1243 u16 threshold;
1244};
1245
1246struct xfrm_algo_desc {
1247 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001248 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001249 u8 available:1;
1250 union {
Herbert Xu1a6509d2008-01-28 19:37:29 -08001251 struct xfrm_algo_aead_info aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 struct xfrm_algo_auth_info auth;
1253 struct xfrm_algo_encr_info encr;
1254 struct xfrm_algo_comp_info comp;
1255 } uinfo;
1256 struct sadb_alg desc;
1257};
1258
1259/* XFRM tunnel handlers. */
1260struct xfrm_tunnel {
1261 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001262 int (*err_handler)(struct sk_buff *skb, __u32 info);
1263
1264 struct xfrm_tunnel *next;
1265 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266};
1267
1268struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001269 int (*handler)(struct sk_buff *skb);
1270 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Brian Haleyd5fdd6b2009-06-23 04:31:07 -07001271 u8 type, u8 code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001272 struct xfrm6_tunnel *next;
1273 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274};
1275
1276extern void xfrm_init(void);
Neil Hormana33bc5c2009-07-30 18:52:15 -07001277extern void xfrm4_init(int rt_hash_size);
Alexey Dobriyand62ddc22008-11-25 17:14:31 -08001278extern int xfrm_state_init(struct net *net);
1279extern void xfrm_state_fini(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001280extern void xfrm4_state_init(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001281#ifdef CONFIG_XFRM
1282extern int xfrm6_init(void);
1283extern void xfrm6_fini(void);
Daniel Lezcano0013cab2007-12-07 00:42:11 -08001284extern int xfrm6_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285extern void xfrm6_state_fini(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001286#else
1287static inline int xfrm6_init(void)
1288{
1289 return 0;
1290}
1291static inline void xfrm6_fini(void)
1292{
1293 ;
1294}
1295#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001297#ifdef CONFIG_XFRM_STATISTICS
Alexey Dobriyanc68cd1a2008-11-25 18:00:14 -08001298extern int xfrm_proc_init(struct net *net);
1299extern void xfrm_proc_fini(struct net *net);
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001300#endif
1301
Alexey Dobriyanb27aead2008-11-25 18:00:48 -08001302extern int xfrm_sysctl_init(struct net *net);
1303#ifdef CONFIG_SYSCTL
1304extern void xfrm_sysctl_fini(struct net *net);
1305#else
1306static inline void xfrm_sysctl_fini(struct net *net)
1307{
1308}
1309#endif
1310
Herbert Xu5c182452008-09-22 19:48:19 -07001311extern void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto);
Alexey Dobriyan284fa7d2008-11-25 17:32:14 -08001312extern int xfrm_state_walk(struct net *net, struct xfrm_state_walk *walk,
Timo Teras4c563f72008-02-28 21:31:08 -08001313 int (*func)(struct xfrm_state *, int, void*), void *);
Herbert Xuabb81c42008-09-09 19:58:29 -07001314extern void xfrm_state_walk_done(struct xfrm_state_walk *walk);
Alexey Dobriyan673c09b2008-11-25 17:15:16 -08001315extern struct xfrm_state *xfrm_state_alloc(struct net *net);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1317 struct flowi *fl, struct xfrm_tmpl *tmpl,
1318 struct xfrm_policy *pol, int *err,
1319 unsigned short family);
Alexey Dobriyan5447c5e2008-11-25 17:31:51 -08001320extern struct xfrm_state * xfrm_stateonly_find(struct net *net,
1321 xfrm_address_t *daddr,
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001322 xfrm_address_t *saddr,
1323 unsigned short family,
1324 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001325extern int xfrm_state_check_expire(struct xfrm_state *x);
1326extern void xfrm_state_insert(struct xfrm_state *x);
1327extern int xfrm_state_add(struct xfrm_state *x);
1328extern int xfrm_state_update(struct xfrm_state *x);
Alexey Dobriyan221df1e2008-11-25 17:30:50 -08001329extern struct xfrm_state *xfrm_state_lookup(struct net *net, xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
1330extern struct xfrm_state *xfrm_state_lookup_byaddr(struct net *net, xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001331#ifdef CONFIG_XFRM_SUB_POLICY
1332extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1333 int n, unsigned short family);
1334extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1335 int n, unsigned short family);
1336#else
1337static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1338 int n, unsigned short family)
1339{
1340 return -ENOSYS;
1341}
1342
1343static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1344 int n, unsigned short family)
1345{
1346 return -ENOSYS;
1347}
1348#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001349
1350struct xfrmk_sadinfo {
1351 u32 sadhcnt; /* current hash bkts */
1352 u32 sadhmcnt; /* max allowed hash bkts */
1353 u32 sadcnt; /* current running count */
1354};
1355
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001356struct xfrmk_spdinfo {
1357 u32 incnt;
1358 u32 outcnt;
1359 u32 fwdcnt;
1360 u32 inscnt;
1361 u32 outscnt;
1362 u32 fwdscnt;
1363 u32 spdhcnt;
1364 u32 spdhmcnt;
1365};
1366
Alexey Dobriyan5447c5e2008-11-25 17:31:51 -08001367extern struct xfrm_state *xfrm_find_acq_byseq(struct net *net, u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001368extern int xfrm_state_delete(struct xfrm_state *x);
Alexey Dobriyan0e602452008-11-25 17:30:18 -08001369extern int xfrm_state_flush(struct net *net, u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001370extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001371extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Paul Mooreafeb14b2007-12-21 14:58:11 -08001372extern int xfrm_replay_check(struct xfrm_state *x,
1373 struct sk_buff *skb, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001374extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001375extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001376extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001377extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001378extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001379extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1380 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001381extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001382extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001383extern int xfrm_output(struct sk_buff *skb);
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -07001384extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001385extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001386extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001387extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1388 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001389extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001390extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001391
1392static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1393{
1394 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1395}
1396
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001397extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001400extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1401extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001402extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001403extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001404extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001405extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001406extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001407extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1408 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001409extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1410extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001411extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001413extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001414extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1415extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001416extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001417extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1418 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001419
1420#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001421extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001422extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001423#else
1424static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1425{
1426 return -ENOPROTOOPT;
1427}
1428
James Chapman067b2072007-07-05 17:08:05 -07001429static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001430{
1431 /* should not happen */
1432 kfree_skb(skb);
1433 return 0;
1434}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001435#endif
1436
Alexey Dobriyan0331b1f2008-11-25 17:21:45 -08001437struct xfrm_policy *xfrm_policy_alloc(struct net *net, gfp_t gfp);
Timo Teras4c563f72008-02-28 21:31:08 -08001438
Herbert Xu12a169e2008-10-01 07:03:24 -07001439extern void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type);
Alexey Dobriyancdcbca72008-11-25 17:34:49 -08001440extern int xfrm_policy_walk(struct net *net, struct xfrm_policy_walk *walk,
Timo Teras4c563f72008-02-28 21:31:08 -08001441 int (*func)(struct xfrm_policy *, int, int, void*), void *);
Herbert Xu12a169e2008-10-01 07:03:24 -07001442extern void xfrm_policy_walk_done(struct xfrm_policy_walk *walk);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001443int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -08001444struct xfrm_policy *xfrm_policy_bysel_ctx(struct net *net, u8 type, int dir,
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001445 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001446 struct xfrm_sec_ctx *ctx, int delete,
1447 int *err);
Alexey Dobriyan8d1211a2008-11-25 17:34:20 -08001448struct xfrm_policy *xfrm_policy_byid(struct net *net, u8, int dir, u32 id, int delete, int *err);
Alexey Dobriyan33ffbbd2008-11-25 17:33:32 -08001449int xfrm_policy_flush(struct net *net, u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001451extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Alexey Dobriyan5447c5e2008-11-25 17:31:51 -08001452struct xfrm_state * xfrm_find_acq(struct net *net, u8 mode, u32 reqid, u8 proto,
Joy Latten161a09e2006-11-27 13:11:54 -06001453 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001454 int create, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001456extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1457 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001458
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001459#ifdef CONFIG_XFRM_MIGRATE
1460extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07001461 struct xfrm_migrate *m, int num_bundles,
1462 struct xfrm_kmaddress *k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001463extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1464extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1465 struct xfrm_migrate *m);
1466extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
Arnaud Ebalard13c1d182008-10-05 13:33:42 -07001467 struct xfrm_migrate *m, int num_bundles,
1468 struct xfrm_kmaddress *k);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001469#endif
1470
Al Viro5d36b182006-11-08 00:24:06 -08001471extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001472extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Alexey Dobriyandb983c12008-11-25 17:51:01 -08001473extern int km_report(struct net *net, u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001474
1475extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001476extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477
1478extern void xfrm_probe_algs(void);
1479extern int xfrm_count_auth_supported(void);
1480extern int xfrm_count_enc_supported(void);
1481extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1482extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1483extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1484extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1485extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1486extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1487extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1488extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
Herbert Xu1a6509d2008-01-28 19:37:29 -08001489extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1490 int probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001491
Herbert Xu07d4ee52006-08-20 14:24:50 +10001492struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001493struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001494typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1495 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001496
Linus Torvalds1da177e2005-04-16 15:20:36 -07001497static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1498 int family)
1499{
1500 switch (family) {
1501 default:
1502 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001503 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001504 case AF_INET6:
1505 return ipv6_addr_cmp((struct in6_addr *)a,
1506 (struct in6_addr *)b);
1507 }
1508}
1509
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001510static inline int xfrm_policy_id2dir(u32 index)
1511{
1512 return index & 7;
1513}
1514
Alexey Dobriyana6483b72008-11-25 17:38:20 -08001515#ifdef CONFIG_XFRM
1516static inline int xfrm_aevent_is_on(struct net *net)
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001517{
Patrick McHardybe336902006-03-20 22:40:54 -08001518 struct sock *nlsk;
1519 int ret = 0;
1520
1521 rcu_read_lock();
Alexey Dobriyana6483b72008-11-25 17:38:20 -08001522 nlsk = rcu_dereference(net->xfrm.nlsk);
Patrick McHardybe336902006-03-20 22:40:54 -08001523 if (nlsk)
1524 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1525 rcu_read_unlock();
1526 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001527}
Alexey Dobriyana6483b72008-11-25 17:38:20 -08001528#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001529
Eric Dumazet0f99be02008-01-08 23:39:06 -08001530static inline int xfrm_alg_len(struct xfrm_algo *alg)
1531{
1532 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1533}
1534
Martin Willi4447bb32009-11-25 00:29:52 +00001535static inline int xfrm_alg_auth_len(struct xfrm_algo_auth *alg)
1536{
1537 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1538}
1539
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001540#ifdef CONFIG_XFRM_MIGRATE
1541static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1542{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001543 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001544}
1545
Martin Willi4447bb32009-11-25 00:29:52 +00001546static inline struct xfrm_algo_auth *xfrm_algo_auth_clone(struct xfrm_algo_auth *orig)
1547{
1548 return kmemdup(orig, xfrm_alg_auth_len(orig), GFP_KERNEL);
1549}
1550
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001551static inline void xfrm_states_put(struct xfrm_state **states, int n)
1552{
1553 int i;
1554 for (i = 0; i < n; i++)
1555 xfrm_state_put(*(states + i));
1556}
1557
1558static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1559{
1560 int i;
1561 for (i = 0; i < n; i++)
1562 xfrm_state_delete(*(states + i));
1563}
1564#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001565
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001566#ifdef CONFIG_XFRM
Herbert Xu00501122007-12-11 01:53:43 -08001567static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1568{
1569 return skb->sp->xvec[skb->sp->len - 1];
1570}
Alexey Dobriyandef8b4f2008-10-28 13:24:06 -07001571#endif
Herbert Xu00501122007-12-11 01:53:43 -08001572
Linus Torvalds1da177e2005-04-16 15:20:36 -07001573#endif /* _NET_XFRM_H */