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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>
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080022#ifdef CONFIG_XFRM_STATISTICS
23#include <net/snmp.h>
24#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070026#define XFRM_PROTO_ESP 50
27#define XFRM_PROTO_AH 51
28#define XFRM_PROTO_COMP 108
29#define XFRM_PROTO_IPIP 4
30#define XFRM_PROTO_IPV6 41
31#define XFRM_PROTO_ROUTING IPPROTO_ROUTING
32#define XFRM_PROTO_DSTOPTS IPPROTO_DSTOPTS
33
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#define XFRM_ALIGN8(len) (((len) + 7) & ~7)
Herbert Xub59f45d2006-05-27 23:05:54 -070035#define MODULE_ALIAS_XFRM_MODE(family, encap) \
36 MODULE_ALIAS("xfrm-mode-" __stringify(family) "-" __stringify(encap))
Masahide NAKAMURAd3d6dd32007-06-26 23:57:49 -070037#define MODULE_ALIAS_XFRM_TYPE(family, proto) \
38 MODULE_ALIAS("xfrm-type-" __stringify(family) "-" __stringify(proto))
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -080040#ifdef CONFIG_XFRM_STATISTICS
41DECLARE_SNMP_STAT(struct linux_xfrm_mib, xfrm_statistics);
42#define XFRM_INC_STATS(field) SNMP_INC_STATS(xfrm_statistics, field)
43#define XFRM_INC_STATS_BH(field) SNMP_INC_STATS_BH(xfrm_statistics, field)
44#define XFRM_INC_STATS_USER(field) SNMP_INC_STATS_USER(xfrm_statistics, field)
45#else
46#define XFRM_INC_STATS(field)
47#define XFRM_INC_STATS_BH(field)
48#define XFRM_INC_STATS_USER(field)
49#endif
50
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080051extern struct sock *xfrm_nl;
52extern u32 sysctl_xfrm_aevent_etime;
53extern u32 sysctl_xfrm_aevent_rseqth;
Pavel Emelyanova37ae402007-10-23 21:13:53 -070054extern int sysctl_xfrm_larval_drop;
55extern u32 sysctl_xfrm_acq_expires;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -080056
Arjan van de Ven4a3e2f72006-03-20 22:33:17 -080057extern struct mutex xfrm_cfg_mutex;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
59/* Organization of SPD aka "XFRM rules"
60 ------------------------------------
61
62 Basic objects:
63 - policy rule, struct xfrm_policy (=SPD entry)
64 - bundle of transformations, struct dst_entry == struct xfrm_dst (=SA bundle)
65 - instance of a transformer, struct xfrm_state (=SA)
66 - template to clone xfrm_state, struct xfrm_tmpl
67
68 SPD is plain linear list of xfrm_policy rules, ordered by priority.
69 (To be compatible with existing pfkeyv2 implementations,
70 many rules with priority of 0x7fffffff are allowed to exist and
71 such rules are ordered in an unpredictable way, thanks to bsd folks.)
72
73 Lookup is plain linear search until the first match with selector.
74
75 If "action" is "block", then we prohibit the flow, otherwise:
76 if "xfrms_nr" is zero, the flow passes untransformed. Otherwise,
77 policy entry has list of up to XFRM_MAX_DEPTH transformations,
78 described by templates xfrm_tmpl. Each template is resolved
79 to a complete xfrm_state (see below) and we pack bundle of transformations
80 to a dst_entry returned to requestor.
81
82 dst -. xfrm .-> xfrm_state #1
83 |---. child .-> dst -. xfrm .-> xfrm_state #2
84 |---. child .-> dst -. xfrm .-> xfrm_state #3
85 |---. child .-> NULL
86
87 Bundles are cached at xrfm_policy struct (field ->bundles).
88
89
90 Resolution of xrfm_tmpl
91 -----------------------
92 Template contains:
93 1. ->mode Mode: transport or tunnel
94 2. ->id.proto Protocol: AH/ESP/IPCOMP
95 3. ->id.daddr Remote tunnel endpoint, ignored for transport mode.
96 Q: allow to resolve security gateway?
97 4. ->id.spi If not zero, static SPI.
98 5. ->saddr Local tunnel endpoint, ignored for transport mode.
99 6. ->algos List of allowed algos. Plain bitmask now.
100 Q: ealgos, aalgos, calgos. What a mess...
101 7. ->share Sharing mode.
102 Q: how to implement private sharing mode? To add struct sock* to
103 flow id?
104
105 Having this template we search through SAD searching for entries
106 with appropriate mode/proto/algo, permitted by selector.
107 If no appropriate entry found, it is requested from key manager.
108
109 PROBLEMS:
110 Q: How to find all the bundles referring to a physical path for
111 PMTU discovery? Seems, dst should contain list of all parents...
112 and enter to infinite locking hierarchy disaster.
113 No! It is easier, we will not search for them, let them find us.
114 We add genid to each dst plus pointer to genid of raw IP route,
115 pmtu disc will update pmtu on raw IP route and increase its genid.
116 dst_check() will see this for top level and trigger resyncing
117 metrics. Plus, it will be made via sk->sk_dst_cache. Solved.
118 */
119
120/* Full description of state of transformer. */
121struct xfrm_state
122{
123 /* Note: bydst is re-used during gc */
Timo Teras4c563f72008-02-28 21:31:08 -0800124 struct list_head all;
David S. Miller8f126e32006-08-24 02:45:07 -0700125 struct hlist_node bydst;
126 struct hlist_node bysrc;
127 struct hlist_node byspi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 atomic_t refcnt;
130 spinlock_t lock;
131
132 struct xfrm_id id;
133 struct xfrm_selector sel;
134
David S. Miller9d4a7062006-08-24 03:18:09 -0700135 u32 genid;
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 /* Key manger bits */
138 struct {
139 u8 state;
140 u8 dying;
141 u32 seq;
142 } km;
143
144 /* Parameters of this state. */
145 struct {
146 u32 reqid;
147 u8 mode;
148 u8 replay_window;
149 u8 aalgo, ealgo, calgo;
150 u8 flags;
151 u16 family;
152 xfrm_address_t saddr;
153 int header_len;
154 int trailer_len;
155 } props;
156
157 struct xfrm_lifetime_cfg lft;
158
159 /* Data for transformer */
160 struct xfrm_algo *aalg;
161 struct xfrm_algo *ealg;
162 struct xfrm_algo *calg;
Herbert Xu1a6509d2008-01-28 19:37:29 -0800163 struct xfrm_algo_aead *aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164
165 /* Data for encapsulator */
166 struct xfrm_encap_tmpl *encap;
167
Noriaki TAKAMIYA060f02a2006-08-23 18:18:55 -0700168 /* Data for care-of address */
169 xfrm_address_t *coaddr;
170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 /* IPComp needs an IPIP tunnel for handling uncompressed packets */
172 struct xfrm_state *tunnel;
173
174 /* If a tunnel, number of users + 1 */
175 atomic_t tunnel_users;
176
177 /* State for replay detection */
178 struct xfrm_replay_state replay;
179
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800180 /* Replay detection state at the time we sent the last notification */
181 struct xfrm_replay_state preplay;
182
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700183 /* internal flag that only holds state for delayed aevent at the
184 * moment
185 */
186 u32 xflags;
187
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800188 /* Replay detection notification settings */
189 u32 replay_maxage;
190 u32 replay_maxdiff;
191
192 /* Replay detection notification timer */
193 struct timer_list rtimer;
194
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 /* Statistics */
196 struct xfrm_stats stats;
197
198 struct xfrm_lifetime_cur curlft;
199 struct timer_list timer;
200
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700201 /* Last used time */
Herbert Xud26f3982007-11-13 21:47:08 -0800202 unsigned long lastused;
Masahide NAKAMURA9afaca02006-08-23 18:20:16 -0700203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 /* Reference to data common to all the instances of this
205 * transformer. */
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800206 const struct xfrm_type *type;
Herbert Xu13996372007-10-17 21:35:51 -0700207 struct xfrm_mode *inner_mode;
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700208 struct xfrm_mode *inner_mode_iaf;
Herbert Xu13996372007-10-17 21:35:51 -0700209 struct xfrm_mode *outer_mode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Trent Jaegerdf718372005-12-13 23:12:27 -0800211 /* Security context */
212 struct xfrm_sec_ctx *security;
213
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 /* Private data of this transformer, format is opaque,
215 * interpreted by xfrm_type methods. */
216 void *data;
217};
218
Jamal Hadi Salim27170962006-04-14 15:03:05 -0700219/* xflags - make enum if more show up */
220#define XFRM_TIME_DEFER 1
221
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222enum {
223 XFRM_STATE_VOID,
224 XFRM_STATE_ACQ,
225 XFRM_STATE_VALID,
226 XFRM_STATE_ERROR,
227 XFRM_STATE_EXPIRED,
228 XFRM_STATE_DEAD
229};
230
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700231/* callback structure passed from either netlink or pfkey */
232struct km_event
233{
Herbert Xubf088672005-06-18 22:44:00 -0700234 union {
235 u32 hard;
236 u32 proto;
237 u32 byid;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800238 u32 aevent;
Masahide NAKAMURAf7b69832006-08-23 22:49:28 -0700239 u32 type;
Herbert Xubf088672005-06-18 22:44:00 -0700240 } data;
241
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700242 u32 seq;
243 u32 pid;
244 u32 event;
245};
246
Herbert Xu25ee3282007-12-11 09:32:34 -0800247struct net_device;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248struct xfrm_type;
249struct xfrm_dst;
250struct xfrm_policy_afinfo {
251 unsigned short family;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 struct dst_ops *dst_ops;
253 void (*garbage_collect)(void);
Herbert Xu66cdb3c2007-11-13 21:37:28 -0800254 struct dst_entry *(*dst_lookup)(int tos, xfrm_address_t *saddr,
255 xfrm_address_t *daddr);
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700256 int (*get_saddr)(xfrm_address_t *saddr, xfrm_address_t *daddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 struct dst_entry *(*find_bundle)(struct flowi *fl, struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 void (*decode_session)(struct sk_buff *skb,
Herbert Xud5422ef2007-12-12 10:44:16 -0800259 struct flowi *fl,
260 int reverse);
Herbert Xu25ee3282007-12-11 09:32:34 -0800261 int (*get_tos)(struct flowi *fl);
Masahide NAKAMURAa1b05142007-12-20 20:41:12 -0800262 int (*init_path)(struct xfrm_dst *path,
263 struct dst_entry *dst,
264 int nfheader_len);
Herbert Xu25ee3282007-12-11 09:32:34 -0800265 int (*fill_dst)(struct xfrm_dst *xdst,
266 struct net_device *dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267};
268
269extern int xfrm_policy_register_afinfo(struct xfrm_policy_afinfo *afinfo);
270extern int xfrm_policy_unregister_afinfo(struct xfrm_policy_afinfo *afinfo);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700271extern void km_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c);
272extern void km_state_notify(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273
274struct xfrm_tmpl;
Jamal Hadi Salim980ebd22006-03-20 19:16:40 -0800275extern int km_query(struct xfrm_state *x, struct xfrm_tmpl *t, struct xfrm_policy *pol);
Jamal Hadi Salim53bc6b42006-03-20 19:17:03 -0800276extern void km_state_expired(struct xfrm_state *x, int hard, u32 pid);
277extern int __xfrm_state_delete(struct xfrm_state *x);
278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279struct xfrm_state_afinfo {
Herbert Xu17c2a422007-10-17 21:33:12 -0700280 unsigned int family;
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800281 unsigned int proto;
Al Viro8e3d7162008-03-17 22:49:16 -0700282 __be16 eth_proto;
Herbert Xu17c2a422007-10-17 21:33:12 -0700283 struct module *owner;
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800284 const struct xfrm_type *type_map[IPPROTO_MAX];
Herbert Xuaa5d62c2007-10-17 21:31:12 -0700285 struct xfrm_mode *mode_map[XFRM_MODE_MAX];
Herbert Xud094cd82005-06-20 13:19:41 -0700286 int (*init_flags)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 void (*init_tempsel)(struct xfrm_state *x, struct flowi *fl,
288 struct xfrm_tmpl *tmpl,
289 xfrm_address_t *daddr, xfrm_address_t *saddr);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -0700290 int (*tmpl_sort)(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n);
291 int (*state_sort)(struct xfrm_state **dst, struct xfrm_state **src, int n);
Miika Komucdca7262007-02-06 14:24:56 -0800292 int (*output)(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -0800293 int (*extract_input)(struct xfrm_state *x,
294 struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800295 int (*extract_output)(struct xfrm_state *x,
296 struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -0800297 int (*transport_finish)(struct sk_buff *skb,
298 int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299};
300
301extern int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
302extern int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
303
304extern void xfrm_state_delete_tunnel(struct xfrm_state *x);
305
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306struct xfrm_type
307{
308 char *description;
309 struct module *owner;
310 __u8 proto;
Masahide NAKAMURA1b5c2292006-08-23 18:11:50 -0700311 __u8 flags;
312#define XFRM_TYPE_NON_FRAGMENT 1
Herbert Xu436a0a42007-10-08 17:25:53 -0700313#define XFRM_TYPE_REPLAY_PROT 2
Herbert Xuf04e7e82007-11-13 21:36:51 -0800314#define XFRM_TYPE_LOCAL_COADDR 4
315#define XFRM_TYPE_REMOTE_COADDR 8
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
Herbert Xu72cb6962005-06-20 13:18:08 -0700317 int (*init_state)(struct xfrm_state *x);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 void (*destructor)(struct xfrm_state *);
Herbert Xue6956332006-04-01 00:52:46 -0800319 int (*input)(struct xfrm_state *, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320 int (*output)(struct xfrm_state *, struct sk_buff *pskb);
Masahide NAKAMURAdf0ba922006-08-23 20:41:00 -0700321 int (*reject)(struct xfrm_state *, struct sk_buff *, struct flowi *);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -0700322 int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 /* Estimate maximal size of result of transformation of a dgram */
Patrick McHardyc5c25232007-04-09 11:47:18 -0700324 u32 (*get_mtu)(struct xfrm_state *, int size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325};
326
Eric Dumazet533cb5b2008-01-30 19:11:50 -0800327extern int xfrm_register_type(const struct xfrm_type *type, unsigned short family);
328extern int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
Herbert Xub59f45d2006-05-27 23:05:54 -0700330struct xfrm_mode {
Herbert Xu227620e2007-11-13 21:41:28 -0800331 /*
332 * Remove encapsulation header.
333 *
334 * The IP header will be moved over the top of the encapsulation
335 * header.
336 *
337 * On entry, the transport header shall point to where the IP header
338 * should be and the network header shall be set to where the IP
339 * header currently is. skb->data shall point to the start of the
340 * payload.
341 */
342 int (*input2)(struct xfrm_state *x, struct sk_buff *skb);
343
344 /*
345 * This is the actual input entry point.
346 *
347 * For transport mode and equivalent this would be identical to
348 * input2 (which does not need to be set). While tunnel mode
349 * and equivalent would set this to the tunnel encapsulation function
350 * xfrm4_prepare_input that would in turn call input2.
351 */
Herbert Xub59f45d2006-05-27 23:05:54 -0700352 int (*input)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu37fedd32007-10-10 15:44:44 -0700353
354 /*
355 * Add encapsulation header.
356 *
357 * On exit, the transport header will be set to the start of the
358 * encapsulation header to be filled in by x->type->output and
359 * the mac header will be set to the nextheader (protocol for
360 * IPv4) field of the extension header directly preceding the
361 * encapsulation header, or in its absence, that of the top IP
362 * header. The value of the network header will always point
363 * to the top IP header while skb->data will point to the payload.
364 */
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800365 int (*output2)(struct xfrm_state *x,struct sk_buff *skb);
366
367 /*
368 * This is the actual output entry point.
369 *
370 * For transport mode and equivalent this would be identical to
371 * output2 (which does not need to be set). While tunnel mode
372 * and equivalent would set this to a tunnel encapsulation function
373 * (xfrm4_prepare_output or xfrm6_prepare_output) that would in turn
374 * call output2.
375 */
376 int (*output)(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xub59f45d2006-05-27 23:05:54 -0700377
Herbert Xu17c2a422007-10-17 21:33:12 -0700378 struct xfrm_state_afinfo *afinfo;
Herbert Xub59f45d2006-05-27 23:05:54 -0700379 struct module *owner;
380 unsigned int encap;
Herbert Xu1bfcb102007-10-17 21:31:50 -0700381 int flags;
382};
383
384/* Flags for xfrm_mode. */
385enum {
386 XFRM_MODE_FLAG_TUNNEL = 1,
Herbert Xub59f45d2006-05-27 23:05:54 -0700387};
388
389extern int xfrm_register_mode(struct xfrm_mode *mode, int family);
390extern int xfrm_unregister_mode(struct xfrm_mode *mode, int family);
Herbert Xub59f45d2006-05-27 23:05:54 -0700391
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -0700392static inline int xfrm_af2proto(unsigned int family)
393{
394 switch(family) {
395 case AF_INET:
396 return IPPROTO_IPIP;
397 case AF_INET6:
398 return IPPROTO_IPV6;
399 default:
400 return 0;
401 }
402}
403
404static inline struct xfrm_mode *xfrm_ip2inner_mode(struct xfrm_state *x, int ipproto)
405{
406 if ((ipproto == IPPROTO_IPIP && x->props.family == AF_INET) ||
407 (ipproto == IPPROTO_IPV6 && x->props.family == AF_INET6))
408 return x->inner_mode;
409 else
410 return x->inner_mode_iaf;
411}
412
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413struct xfrm_tmpl
414{
415/* id in template is interpreted as:
416 * daddr - destination of tunnel, may be zero for transport mode.
417 * spi - zero to acquire spi. Not zero if spi is static, then
418 * daddr must be fixed too.
419 * proto - AH/ESP/IPCOMP
420 */
421 struct xfrm_id id;
422
423/* Source address of tunnel. Ignored, if it is not a tunnel. */
424 xfrm_address_t saddr;
425
Miika Komu76b3f052006-11-30 16:40:43 -0800426 unsigned short encap_family;
427
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 __u32 reqid;
429
Masahide NAKAMURA7e49e6d2006-09-22 15:05:15 -0700430/* Mode: transport, tunnel etc. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 __u8 mode;
432
433/* Sharing mode: unique, this session only, this user only etc. */
434 __u8 share;
435
436/* May skip this transfomration if no SA is found */
437 __u8 optional;
438
Herbert Xuc5d18e92008-04-22 00:46:42 -0700439/* Skip aalgos/ealgos/calgos checks. */
440 __u8 allalgs;
441
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442/* Bit mask of algos allowed for acquisition */
443 __u32 aalgos;
444 __u32 ealgos;
445 __u32 calgos;
446};
447
Masahide NAKAMURA622dc822006-08-23 17:52:01 -0700448#define XFRM_MAX_DEPTH 6
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449
450struct xfrm_policy
451{
452 struct xfrm_policy *next;
Timo Teras4c563f72008-02-28 21:31:08 -0800453 struct list_head bytype;
David S. Miller2518c7c2006-08-24 04:45:07 -0700454 struct hlist_node bydst;
455 struct hlist_node byidx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456
457 /* This lock only affects elements except for entry. */
458 rwlock_t lock;
459 atomic_t refcnt;
460 struct timer_list timer;
461
462 u32 priority;
463 u32 index;
464 struct xfrm_selector selector;
465 struct xfrm_lifetime_cfg lft;
466 struct xfrm_lifetime_cur curlft;
467 struct dst_entry *bundles;
Arnaldo Carvalho de Melo46ca5f52006-11-27 17:58:59 -0200468 u16 family;
469 u8 type;
470 u8 action;
471 u8 flags;
472 u8 dead;
473 u8 xfrm_nr;
474 /* XXX 1 byte hole, try to pack */
Trent Jaegerdf718372005-12-13 23:12:27 -0800475 struct xfrm_sec_ctx *security;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 struct xfrm_tmpl xfrm_vec[XFRM_MAX_DEPTH];
477};
478
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800479struct xfrm_migrate {
480 xfrm_address_t old_daddr;
481 xfrm_address_t old_saddr;
482 xfrm_address_t new_daddr;
483 xfrm_address_t new_saddr;
484 u8 proto;
485 u8 mode;
486 u16 reserved;
487 u32 reqid;
488 u16 old_family;
489 u16 new_family;
490};
491
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -0800492#define XFRM_KM_TIMEOUT 30
493/* which seqno */
494#define XFRM_REPLAY_SEQ 1
495#define XFRM_REPLAY_OSEQ 2
496#define XFRM_REPLAY_SEQ_MASK 3
497/* what happened */
498#define XFRM_REPLAY_UPDATE XFRM_AE_CR
499#define XFRM_REPLAY_TIMEOUT XFRM_AE_CE
500
501/* default aevent timeout in units of 100ms */
502#define XFRM_AE_ETIME 10
503/* Async Event timer multiplier */
504#define XFRM_AE_ETH_M 10
505/* default seq threshold size */
506#define XFRM_AE_SEQT_SIZE 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700507
508struct xfrm_mgr
509{
510 struct list_head list;
511 char *id;
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700512 int (*notify)(struct xfrm_state *x, struct km_event *c);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 int (*acquire)(struct xfrm_state *x, struct xfrm_tmpl *, struct xfrm_policy *xp, int dir);
Venkat Yekkiralacb969f02006-07-24 23:32:20 -0700514 struct xfrm_policy *(*compile_policy)(struct sock *sk, int opt, u8 *data, int len, int *dir);
Al Viro5d36b182006-11-08 00:24:06 -0800515 int (*new_mapping)(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -0700516 int (*notify_policy)(struct xfrm_policy *x, int dir, struct km_event *c);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -0700517 int (*report)(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -0800518 int (*migrate)(struct xfrm_selector *sel, u8 dir, u8 type, struct xfrm_migrate *m, int num_bundles);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519};
520
521extern int xfrm_register_km(struct xfrm_mgr *km);
522extern int xfrm_unregister_km(struct xfrm_mgr *km);
523
David S. Miller2518c7c2006-08-24 04:45:07 -0700524extern unsigned int xfrm_policy_count[XFRM_POLICY_MAX*2];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525
Herbert Xu436a0a42007-10-08 17:25:53 -0700526/*
527 * This structure is used for the duration where packets are being
528 * transformed by IPsec. As soon as the packet leaves IPsec the
529 * area beyond the generic IP part may be overwritten.
530 */
531struct xfrm_skb_cb {
532 union {
533 struct inet_skb_parm h4;
534 struct inet6_skb_parm h6;
535 } header;
536
537 /* Sequence number for replay protection. */
Herbert Xub318e0e2008-02-12 22:50:35 -0800538 union {
539 u64 output;
540 __be32 input;
541 } seq;
Herbert Xu436a0a42007-10-08 17:25:53 -0700542};
543
544#define XFRM_SKB_CB(__skb) ((struct xfrm_skb_cb *)&((__skb)->cb[0]))
545
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800546/*
547 * This structure is used by the afinfo prepare_input/prepare_output functions
548 * to transmit header information to the mode input/output functions.
549 */
550struct xfrm_mode_skb_cb {
551 union {
552 struct inet_skb_parm h4;
553 struct inet6_skb_parm h6;
554 } header;
555
556 /* Copied from header for IPv4, always set to zero and DF for IPv6. */
557 __be16 id;
558 __be16 frag_off;
559
Herbert Xu732c8bd2008-03-26 16:51:09 -0700560 /* IP header length (excluding options or extension headers). */
561 u8 ihl;
562
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800563 /* TOS for IPv4, class for IPv6. */
564 u8 tos;
565
566 /* TTL for IPv4, hop limitfor IPv6. */
567 u8 ttl;
568
569 /* Protocol for IPv4, NH for IPv6. */
570 u8 protocol;
571
Herbert Xu732c8bd2008-03-26 16:51:09 -0700572 /* Option length for IPv4, zero for IPv6. */
573 u8 optlen;
574
Herbert Xu36cf9ac2007-11-13 21:40:52 -0800575 /* Used by IPv6 only, zero for IPv4. */
576 u8 flow_lbl[3];
577};
578
579#define XFRM_MODE_SKB_CB(__skb) ((struct xfrm_mode_skb_cb *)&((__skb)->cb[0]))
580
Herbert Xu716062f2007-11-13 21:44:23 -0800581/*
582 * This structure is used by the input processing to locate the SPI and
583 * related information.
584 */
585struct xfrm_spi_skb_cb {
586 union {
587 struct inet_skb_parm h4;
588 struct inet6_skb_parm h6;
589 } header;
590
Herbert Xu716062f2007-11-13 21:44:23 -0800591 unsigned int daddroff;
Herbert Xu2fcb45b2007-12-03 22:54:12 -0800592 unsigned int family;
Herbert Xu716062f2007-11-13 21:44:23 -0800593};
594
595#define XFRM_SPI_SKB_CB(__skb) ((struct xfrm_spi_skb_cb *)&((__skb)->cb[0]))
596
Joy Latten161a09e2006-11-27 13:11:54 -0600597/* Audit Information */
598struct xfrm_audit
599{
Joy Latten161a09e2006-11-27 13:11:54 -0600600 u32 secid;
Eric Paris25323862008-04-18 10:09:25 -0400601 uid_t loginuid;
602 u32 sessionid;
Joy Latten161a09e2006-11-27 13:11:54 -0600603};
Joy Lattenc9204d92006-11-30 15:50:43 -0600604
605#ifdef CONFIG_AUDITSYSCALL
Paul Mooreafeb14b2007-12-21 14:58:11 -0800606static inline struct audit_buffer *xfrm_audit_start(const char *op)
Joy Lattenab5f5e82007-09-17 11:51:22 -0700607{
608 struct audit_buffer *audit_buf = NULL;
Paul Mooreafeb14b2007-12-21 14:58:11 -0800609
610 if (audit_enabled == 0)
611 return NULL;
612 audit_buf = audit_log_start(current->audit_context, GFP_ATOMIC,
613 AUDIT_MAC_IPSEC_EVENT);
614 if (audit_buf == NULL)
615 return NULL;
616 audit_log_format(audit_buf, "op=%s", op);
617 return audit_buf;
618}
619
Eric Paris25323862008-04-18 10:09:25 -0400620static inline void xfrm_audit_helper_usrinfo(uid_t auid, u32 ses, u32 secid,
Paul Mooreafeb14b2007-12-21 14:58:11 -0800621 struct audit_buffer *audit_buf)
622{
Joy Lattenab5f5e82007-09-17 11:51:22 -0700623 char *secctx;
624 u32 secctx_len;
625
Eric Paris25323862008-04-18 10:09:25 -0400626 audit_log_format(audit_buf, " auid=%u ses=%u", auid, ses);
Paul Moore68277ac2007-12-20 20:49:33 -0800627 if (secid != 0 &&
628 security_secid_to_secctx(secid, &secctx, &secctx_len) == 0) {
Joy Lattenab5f5e82007-09-17 11:51:22 -0700629 audit_log_format(audit_buf, " subj=%s", secctx);
630 security_release_secctx(secctx, secctx_len);
631 } else
632 audit_log_task_context(audit_buf);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700633}
634
635extern void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400636 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700637extern void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
Eric Paris25323862008-04-18 10:09:25 -0400638 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700639extern void xfrm_audit_state_add(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400640 u32 auid, u32 ses, u32 secid);
Joy Lattenab5f5e82007-09-17 11:51:22 -0700641extern void xfrm_audit_state_delete(struct xfrm_state *x, int result,
Eric Paris25323862008-04-18 10:09:25 -0400642 u32 auid, u32 ses, u32 secid);
Paul Mooreafeb14b2007-12-21 14:58:11 -0800643extern void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
644 struct sk_buff *skb);
645extern void xfrm_audit_state_notfound_simple(struct sk_buff *skb, u16 family);
646extern void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
647 __be32 net_spi, __be32 net_seq);
648extern void xfrm_audit_state_icvfail(struct xfrm_state *x,
649 struct sk_buff *skb, u8 proto);
Joy Lattenc9204d92006-11-30 15:50:43 -0600650#else
Marcin Slusarz41fef0e2008-05-03 21:03:01 -0700651
652static inline void xfrm_audit_policy_add(struct xfrm_policy *xp, int result,
653 u32 auid, u32 ses, u32 secid)
654{
655}
656
657static inline void xfrm_audit_policy_delete(struct xfrm_policy *xp, int result,
658 u32 auid, u32 ses, u32 secid)
659{
660}
661
662static inline void xfrm_audit_state_add(struct xfrm_state *x, int result,
663 u32 auid, u32 ses, u32 secid)
664{
665}
666
667static inline void xfrm_audit_state_delete(struct xfrm_state *x, int result,
668 u32 auid, u32 ses, u32 secid)
669{
670}
671
672static inline void xfrm_audit_state_replay_overflow(struct xfrm_state *x,
673 struct sk_buff *skb)
674{
675}
676
677static inline void xfrm_audit_state_notfound_simple(struct sk_buff *skb,
678 u16 family)
679{
680}
681
682static inline void xfrm_audit_state_notfound(struct sk_buff *skb, u16 family,
683 __be32 net_spi, __be32 net_seq)
684{
685}
686
687static inline void xfrm_audit_state_icvfail(struct xfrm_state *x,
688 struct sk_buff *skb, u8 proto)
689{
690}
Joy Lattenc9204d92006-11-30 15:50:43 -0600691#endif /* CONFIG_AUDITSYSCALL */
Joy Latten161a09e2006-11-27 13:11:54 -0600692
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693static inline void xfrm_pol_hold(struct xfrm_policy *policy)
694{
695 if (likely(policy != NULL))
696 atomic_inc(&policy->refcnt);
697}
698
WANG Cong64c31b32008-01-07 22:34:29 -0800699extern void xfrm_policy_destroy(struct xfrm_policy *policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700
701static inline void xfrm_pol_put(struct xfrm_policy *policy)
702{
703 if (atomic_dec_and_test(&policy->refcnt))
WANG Cong64c31b32008-01-07 22:34:29 -0800704 xfrm_policy_destroy(policy);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705}
706
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700707#ifdef CONFIG_XFRM_SUB_POLICY
708static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
709{
710 int i;
711 for (i = npols - 1; i >= 0; --i)
712 xfrm_pol_put(pols[i]);
713}
714#else
715static inline void xfrm_pols_put(struct xfrm_policy **pols, int npols)
716{
717 xfrm_pol_put(pols[0]);
718}
719#endif
720
Linus Torvalds1da177e2005-04-16 15:20:36 -0700721extern void __xfrm_state_destroy(struct xfrm_state *);
722
Herbert Xu21380b82006-02-22 14:47:13 -0800723static inline void __xfrm_state_put(struct xfrm_state *x)
724{
725 atomic_dec(&x->refcnt);
726}
727
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728static inline void xfrm_state_put(struct xfrm_state *x)
729{
730 if (atomic_dec_and_test(&x->refcnt))
731 __xfrm_state_destroy(x);
732}
733
734static inline void xfrm_state_hold(struct xfrm_state *x)
735{
736 atomic_inc(&x->refcnt);
737}
738
739static __inline__ int addr_match(void *token1, void *token2, int prefixlen)
740{
Al Viro5f193432006-09-27 18:46:32 -0700741 __be32 *a1 = token1;
742 __be32 *a2 = token2;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700743 int pdw;
744 int pbi;
745
746 pdw = prefixlen >> 5; /* num of whole __u32 in prefix */
747 pbi = prefixlen & 0x1f; /* num of bits in incomplete u32 in prefix */
748
749 if (pdw)
750 if (memcmp(a1, a2, pdw << 2))
751 return 0;
752
753 if (pbi) {
Al Viro5f193432006-09-27 18:46:32 -0700754 __be32 mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
756 mask = htonl((0xffffffff) << (32 - pbi));
757
758 if ((a1[pdw] ^ a2[pdw]) & mask)
759 return 0;
760 }
761
762 return 1;
763}
764
765static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700766__be16 xfrm_flowi_sport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767{
Al Virof9d07e41f82006-09-27 18:45:50 -0700768 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 switch(fl->proto) {
770 case IPPROTO_TCP:
771 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800772 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 case IPPROTO_SCTP:
774 port = fl->fl_ip_sport;
775 break;
776 case IPPROTO_ICMP:
777 case IPPROTO_ICMPV6:
778 port = htons(fl->fl_icmp_type);
779 break;
Masahide NAKAMURA2ce42722006-08-23 20:39:03 -0700780 case IPPROTO_MH:
781 port = htons(fl->fl_mh_type);
782 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700783 default:
784 port = 0; /*XXX*/
785 }
786 return port;
787}
788
789static __inline__
Al Virof9d07e41f82006-09-27 18:45:50 -0700790__be16 xfrm_flowi_dport(struct flowi *fl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791{
Al Virof9d07e41f82006-09-27 18:45:50 -0700792 __be16 port;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793 switch(fl->proto) {
794 case IPPROTO_TCP:
795 case IPPROTO_UDP:
Gerrit Renkerba4e58e2006-11-27 11:10:57 -0800796 case IPPROTO_UDPLITE:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700797 case IPPROTO_SCTP:
798 port = fl->fl_ip_dport;
799 break;
800 case IPPROTO_ICMP:
801 case IPPROTO_ICMPV6:
802 port = htons(fl->fl_icmp_code);
803 break;
804 default:
805 port = 0; /*XXX*/
806 }
807 return port;
808}
809
Andrew Morton77681022006-11-08 22:46:26 -0800810extern int xfrm_selector_match(struct xfrm_selector *sel, struct flowi *fl,
811 unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812
Trent Jaegerdf718372005-12-13 23:12:27 -0800813#ifdef CONFIG_SECURITY_NETWORK_XFRM
814/* If neither has a context --> match
815 * Otherwise, both must have a context and the sids, doi, alg must match
816 */
817static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
818{
819 return ((!s1 && !s2) ||
820 (s1 && s2 &&
821 (s1->ctx_sid == s2->ctx_sid) &&
822 (s1->ctx_doi == s2->ctx_doi) &&
823 (s1->ctx_alg == s2->ctx_alg)));
824}
825#else
826static inline int xfrm_sec_ctx_match(struct xfrm_sec_ctx *s1, struct xfrm_sec_ctx *s2)
827{
828 return 1;
829}
830#endif
831
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832/* A struct encoding bundle of transformations to apply to some set of flow.
833 *
834 * dst->child points to the next element of bundle.
835 * dst->xfrm points to an instanse of transformer.
836 *
837 * Due to unfortunate limitations of current routing cache, which we
838 * have no time to fix, it mirrors struct rtable and bound to the same
839 * routing key, including saddr,daddr. However, we can have many of
840 * bundles differing by session id. All the bundles grow from a parent
841 * policy rule.
842 */
843struct xfrm_dst
844{
845 union {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846 struct dst_entry dst;
847 struct rtable rt;
848 struct rt6_info rt6;
849 } u;
850 struct dst_entry *route;
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700851#ifdef CONFIG_XFRM_SUB_POLICY
852 struct flowi *origin;
853 struct xfrm_selector *partner;
854#endif
David S. Miller9d4a7062006-08-24 03:18:09 -0700855 u32 genid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 u32 route_mtu_cached;
857 u32 child_mtu_cached;
Hideaki YOSHIFUJI92d63dec2005-05-26 12:58:04 -0700858 u32 route_cookie;
859 u32 path_cookie;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860};
861
Herbert Xuaabc9762005-05-03 16:27:10 -0700862static inline void xfrm_dst_destroy(struct xfrm_dst *xdst)
863{
864 dst_release(xdst->route);
865 if (likely(xdst->u.dst.xfrm))
866 xfrm_state_put(xdst->u.dst.xfrm);
Masahide NAKAMURA157bfc22007-04-30 00:33:35 -0700867#ifdef CONFIG_XFRM_SUB_POLICY
868 kfree(xdst->origin);
869 xdst->origin = NULL;
870 kfree(xdst->partner);
871 xdst->partner = NULL;
872#endif
Herbert Xuaabc9762005-05-03 16:27:10 -0700873}
874
875extern void xfrm_dst_ifdown(struct dst_entry *dst, struct net_device *dev);
876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877struct sec_path
878{
879 atomic_t refcnt;
880 int len;
Herbert Xudbe5b4a2006-04-01 00:54:16 -0800881 struct xfrm_state *xvec[XFRM_MAX_DEPTH];
Linus Torvalds1da177e2005-04-16 15:20:36 -0700882};
883
884static inline struct sec_path *
885secpath_get(struct sec_path *sp)
886{
887 if (sp)
888 atomic_inc(&sp->refcnt);
889 return sp;
890}
891
892extern void __secpath_destroy(struct sec_path *sp);
893
894static inline void
895secpath_put(struct sec_path *sp)
896{
897 if (sp && atomic_dec_and_test(&sp->refcnt))
898 __secpath_destroy(sp);
899}
900
901extern struct sec_path *secpath_dup(struct sec_path *src);
902
903static inline void
904secpath_reset(struct sk_buff *skb)
905{
906#ifdef CONFIG_XFRM
907 secpath_put(skb->sp);
908 skb->sp = NULL;
909#endif
910}
911
912static inline int
Patrick McHardya1e59ab2006-09-19 12:57:34 -0700913xfrm_addr_any(xfrm_address_t *addr, unsigned short family)
914{
915 switch (family) {
916 case AF_INET:
917 return addr->a4 == 0;
918 case AF_INET6:
919 return ipv6_addr_any((struct in6_addr *)&addr->a6);
920 }
921 return 0;
922}
923
924static inline int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700925__xfrm4_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
926{
927 return (tmpl->saddr.a4 &&
928 tmpl->saddr.a4 != x->props.saddr.a4);
929}
930
931static inline int
932__xfrm6_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x)
933{
934 return (!ipv6_addr_any((struct in6_addr*)&tmpl->saddr) &&
935 ipv6_addr_cmp((struct in6_addr *)&tmpl->saddr, (struct in6_addr*)&x->props.saddr));
936}
937
938static inline int
939xfrm_state_addr_cmp(struct xfrm_tmpl *tmpl, struct xfrm_state *x, unsigned short family)
940{
941 switch (family) {
942 case AF_INET:
943 return __xfrm4_state_addr_cmp(tmpl, x);
944 case AF_INET6:
945 return __xfrm6_state_addr_cmp(tmpl, x);
946 }
947 return !0;
948}
949
950#ifdef CONFIG_XFRM
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951extern int __xfrm_policy_check(struct sock *, int dir, struct sk_buff *skb, unsigned short family);
952
Herbert Xud5422ef2007-12-12 10:44:16 -0800953static inline int __xfrm_policy_check2(struct sock *sk, int dir,
954 struct sk_buff *skb,
955 unsigned int family, int reverse)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956{
Herbert Xud5422ef2007-12-12 10:44:16 -0800957 int ndir = dir | (reverse ? XFRM_POLICY_MASK + 1 : 0);
958
Linus Torvalds1da177e2005-04-16 15:20:36 -0700959 if (sk && sk->sk_policy[XFRM_POLICY_IN])
Herbert Xud5422ef2007-12-12 10:44:16 -0800960 return __xfrm_policy_check(sk, ndir, skb, family);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -0700961
David S. Miller2518c7c2006-08-24 04:45:07 -0700962 return (!xfrm_policy_count[dir] && !skb->sp) ||
Linus Torvalds1da177e2005-04-16 15:20:36 -0700963 (skb->dst->flags & DST_NOPOLICY) ||
Herbert Xud5422ef2007-12-12 10:44:16 -0800964 __xfrm_policy_check(sk, ndir, skb, family);
965}
966
967static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
968{
969 return __xfrm_policy_check2(sk, dir, skb, family, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970}
971
972static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
973{
974 return xfrm_policy_check(sk, dir, skb, AF_INET);
975}
976
977static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
978{
979 return xfrm_policy_check(sk, dir, skb, AF_INET6);
980}
981
Herbert Xud5422ef2007-12-12 10:44:16 -0800982static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
983 struct sk_buff *skb)
984{
985 return __xfrm_policy_check2(sk, dir, skb, AF_INET, 1);
986}
987
988static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
989 struct sk_buff *skb)
990{
991 return __xfrm_policy_check2(sk, dir, skb, AF_INET6, 1);
992}
993
994extern int __xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
995 unsigned int family, int reverse);
996
997static inline int xfrm_decode_session(struct sk_buff *skb, struct flowi *fl,
998 unsigned int family)
999{
1000 return __xfrm_decode_session(skb, fl, family, 0);
1001}
1002
1003static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1004 struct flowi *fl,
1005 unsigned int family)
1006{
1007 return __xfrm_decode_session(skb, fl, family, 1);
1008}
1009
Linus Torvalds1da177e2005-04-16 15:20:36 -07001010extern int __xfrm_route_forward(struct sk_buff *skb, unsigned short family);
1011
1012static inline int xfrm_route_forward(struct sk_buff *skb, unsigned short family)
1013{
David S. Miller2518c7c2006-08-24 04:45:07 -07001014 return !xfrm_policy_count[XFRM_POLICY_OUT] ||
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 (skb->dst->flags & DST_NOXFRM) ||
1016 __xfrm_route_forward(skb, family);
1017}
1018
1019static inline int xfrm4_route_forward(struct sk_buff *skb)
1020{
1021 return xfrm_route_forward(skb, AF_INET);
1022}
1023
1024static inline int xfrm6_route_forward(struct sk_buff *skb)
1025{
1026 return xfrm_route_forward(skb, AF_INET6);
1027}
1028
1029extern int __xfrm_sk_clone_policy(struct sock *sk);
1030
1031static inline int xfrm_sk_clone_policy(struct sock *sk)
1032{
1033 if (unlikely(sk->sk_policy[0] || sk->sk_policy[1]))
1034 return __xfrm_sk_clone_policy(sk);
1035 return 0;
1036}
1037
Herbert Xu4666faa2005-06-18 22:43:22 -07001038extern int xfrm_policy_delete(struct xfrm_policy *pol, int dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039
1040static inline void xfrm_sk_free_policy(struct sock *sk)
1041{
1042 if (unlikely(sk->sk_policy[0] != NULL)) {
1043 xfrm_policy_delete(sk->sk_policy[0], XFRM_POLICY_MAX);
1044 sk->sk_policy[0] = NULL;
1045 }
1046 if (unlikely(sk->sk_policy[1] != NULL)) {
1047 xfrm_policy_delete(sk->sk_policy[1], XFRM_POLICY_MAX+1);
1048 sk->sk_policy[1] = NULL;
1049 }
1050}
1051
1052#else
1053
1054static inline void xfrm_sk_free_policy(struct sock *sk) {}
1055static inline int xfrm_sk_clone_policy(struct sock *sk) { return 0; }
1056static inline int xfrm6_route_forward(struct sk_buff *skb) { return 1; }
1057static inline int xfrm4_route_forward(struct sk_buff *skb) { return 1; }
1058static inline int xfrm6_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1059{
1060 return 1;
1061}
1062static inline int xfrm4_policy_check(struct sock *sk, int dir, struct sk_buff *skb)
1063{
1064 return 1;
1065}
1066static inline int xfrm_policy_check(struct sock *sk, int dir, struct sk_buff *skb, unsigned short family)
1067{
1068 return 1;
1069}
Herbert Xud5422ef2007-12-12 10:44:16 -08001070static inline int xfrm_decode_session_reverse(struct sk_buff *skb,
1071 struct flowi *fl,
1072 unsigned int family)
1073{
1074 return -ENOSYS;
1075}
1076static inline int xfrm4_policy_check_reverse(struct sock *sk, int dir,
1077 struct sk_buff *skb)
1078{
1079 return 1;
1080}
1081static inline int xfrm6_policy_check_reverse(struct sock *sk, int dir,
1082 struct sk_buff *skb)
1083{
1084 return 1;
1085}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001086#endif
1087
1088static __inline__
1089xfrm_address_t *xfrm_flowi_daddr(struct flowi *fl, unsigned short family)
1090{
1091 switch (family){
1092 case AF_INET:
1093 return (xfrm_address_t *)&fl->fl4_dst;
1094 case AF_INET6:
1095 return (xfrm_address_t *)&fl->fl6_dst;
1096 }
1097 return NULL;
1098}
1099
1100static __inline__
1101xfrm_address_t *xfrm_flowi_saddr(struct flowi *fl, unsigned short family)
1102{
1103 switch (family){
1104 case AF_INET:
1105 return (xfrm_address_t *)&fl->fl4_src;
1106 case AF_INET6:
1107 return (xfrm_address_t *)&fl->fl6_src;
1108 }
1109 return NULL;
1110}
1111
YOSHIFUJI Hideaki9bb182a2008-02-22 14:48:22 +09001112static __inline__
1113void xfrm_flowi_addr_get(struct flowi *fl,
1114 xfrm_address_t *saddr, xfrm_address_t *daddr,
1115 unsigned short family)
1116{
1117 switch(family) {
1118 case AF_INET:
1119 memcpy(&saddr->a4, &fl->fl4_src, sizeof(saddr->a4));
1120 memcpy(&daddr->a4, &fl->fl4_dst, sizeof(daddr->a4));
1121 break;
1122 case AF_INET6:
1123 ipv6_addr_copy((struct in6_addr *)&saddr->a6, &fl->fl6_src);
1124 ipv6_addr_copy((struct in6_addr *)&daddr->a6, &fl->fl6_dst);
1125 break;
1126 }
1127}
1128
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129static __inline__ int
1130__xfrm4_state_addr_check(struct xfrm_state *x,
1131 xfrm_address_t *daddr, xfrm_address_t *saddr)
1132{
1133 if (daddr->a4 == x->id.daddr.a4 &&
1134 (saddr->a4 == x->props.saddr.a4 || !saddr->a4 || !x->props.saddr.a4))
1135 return 1;
1136 return 0;
1137}
1138
1139static __inline__ int
1140__xfrm6_state_addr_check(struct xfrm_state *x,
1141 xfrm_address_t *daddr, xfrm_address_t *saddr)
1142{
1143 if (!ipv6_addr_cmp((struct in6_addr *)daddr, (struct in6_addr *)&x->id.daddr) &&
1144 (!ipv6_addr_cmp((struct in6_addr *)saddr, (struct in6_addr *)&x->props.saddr)||
1145 ipv6_addr_any((struct in6_addr *)saddr) ||
1146 ipv6_addr_any((struct in6_addr *)&x->props.saddr)))
1147 return 1;
1148 return 0;
1149}
1150
1151static __inline__ int
1152xfrm_state_addr_check(struct xfrm_state *x,
1153 xfrm_address_t *daddr, xfrm_address_t *saddr,
1154 unsigned short family)
1155{
1156 switch (family) {
1157 case AF_INET:
1158 return __xfrm4_state_addr_check(x, daddr, saddr);
1159 case AF_INET6:
1160 return __xfrm6_state_addr_check(x, daddr, saddr);
1161 }
1162 return 0;
1163}
1164
Masahide NAKAMURAe53820d2006-08-23 19:12:01 -07001165static __inline__ int
1166xfrm_state_addr_flow_check(struct xfrm_state *x, struct flowi *fl,
1167 unsigned short family)
1168{
1169 switch (family) {
1170 case AF_INET:
1171 return __xfrm4_state_addr_check(x,
1172 (xfrm_address_t *)&fl->fl4_dst,
1173 (xfrm_address_t *)&fl->fl4_src);
1174 case AF_INET6:
1175 return __xfrm6_state_addr_check(x,
1176 (xfrm_address_t *)&fl->fl6_dst,
1177 (xfrm_address_t *)&fl->fl6_src);
1178 }
1179 return 0;
1180}
1181
Linus Torvalds1da177e2005-04-16 15:20:36 -07001182static inline int xfrm_state_kern(struct xfrm_state *x)
1183{
1184 return atomic_read(&x->tunnel_users);
1185}
1186
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001187static inline int xfrm_id_proto_match(u8 proto, u8 userproto)
1188{
Masahide NAKAMURAdc00a522006-08-23 17:49:52 -07001189 return (!userproto || proto == userproto ||
1190 (userproto == IPSEC_PROTO_ANY && (proto == IPPROTO_AH ||
1191 proto == IPPROTO_ESP ||
1192 proto == IPPROTO_COMP)));
Masahide NAKAMURA57947082006-09-22 15:06:24 -07001193}
1194
Linus Torvalds1da177e2005-04-16 15:20:36 -07001195/*
1196 * xfrm algorithm information
1197 */
Herbert Xu1a6509d2008-01-28 19:37:29 -08001198struct xfrm_algo_aead_info {
1199 u16 icv_truncbits;
1200};
1201
Linus Torvalds1da177e2005-04-16 15:20:36 -07001202struct xfrm_algo_auth_info {
1203 u16 icv_truncbits;
1204 u16 icv_fullbits;
1205};
1206
1207struct xfrm_algo_encr_info {
1208 u16 blockbits;
1209 u16 defkeybits;
1210};
1211
1212struct xfrm_algo_comp_info {
1213 u16 threshold;
1214};
1215
1216struct xfrm_algo_desc {
1217 char *name;
Herbert Xu04ff1262006-08-13 08:50:00 +10001218 char *compat;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219 u8 available:1;
1220 union {
Herbert Xu1a6509d2008-01-28 19:37:29 -08001221 struct xfrm_algo_aead_info aead;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001222 struct xfrm_algo_auth_info auth;
1223 struct xfrm_algo_encr_info encr;
1224 struct xfrm_algo_comp_info comp;
1225 } uinfo;
1226 struct sadb_alg desc;
1227};
1228
1229/* XFRM tunnel handlers. */
1230struct xfrm_tunnel {
1231 int (*handler)(struct sk_buff *skb);
Herbert Xud2acc342006-03-28 01:12:13 -08001232 int (*err_handler)(struct sk_buff *skb, __u32 info);
1233
1234 struct xfrm_tunnel *next;
1235 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236};
1237
1238struct xfrm6_tunnel {
Herbert Xud2acc342006-03-28 01:12:13 -08001239 int (*handler)(struct sk_buff *skb);
1240 int (*err_handler)(struct sk_buff *skb, struct inet6_skb_parm *opt,
Al Viro04ce6902006-11-08 00:21:01 -08001241 int type, int code, int offset, __be32 info);
Herbert Xud2acc342006-03-28 01:12:13 -08001242 struct xfrm6_tunnel *next;
1243 int priority;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001244};
1245
Timo Teras4c563f72008-02-28 21:31:08 -08001246struct xfrm_state_walk {
1247 struct xfrm_state *state;
1248 int count;
1249 u8 proto;
1250};
1251
1252struct xfrm_policy_walk {
1253 struct xfrm_policy *policy;
1254 int count;
1255 u8 type, cur_type;
1256};
1257
Linus Torvalds1da177e2005-04-16 15:20:36 -07001258extern void xfrm_init(void);
1259extern void xfrm4_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001260extern void xfrm_state_init(void);
1261extern void xfrm4_state_init(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001262#ifdef CONFIG_XFRM
1263extern int xfrm6_init(void);
1264extern void xfrm6_fini(void);
Daniel Lezcano0013cab2007-12-07 00:42:11 -08001265extern int xfrm6_state_init(void);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266extern void xfrm6_state_fini(void);
Daniel Lezcanoc35b7e72007-12-08 00:14:11 -08001267#else
1268static inline int xfrm6_init(void)
1269{
1270 return 0;
1271}
1272static inline void xfrm6_fini(void)
1273{
1274 ;
1275}
1276#endif
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277
Masahide NAKAMURA558f82e2007-12-20 20:42:57 -08001278#ifdef CONFIG_XFRM_STATISTICS
1279extern int xfrm_proc_init(void);
1280#endif
1281
Timo Teras4c563f72008-02-28 21:31:08 -08001282static inline void xfrm_state_walk_init(struct xfrm_state_walk *walk, u8 proto)
1283{
1284 walk->proto = proto;
1285 walk->state = NULL;
1286 walk->count = 0;
1287}
1288
1289static inline void xfrm_state_walk_done(struct xfrm_state_walk *walk)
1290{
1291 if (walk->state != NULL) {
1292 xfrm_state_put(walk->state);
1293 walk->state = NULL;
1294 }
1295}
1296
1297extern int xfrm_state_walk(struct xfrm_state_walk *walk,
1298 int (*func)(struct xfrm_state *, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001299extern struct xfrm_state *xfrm_state_alloc(void);
1300extern struct xfrm_state *xfrm_state_find(xfrm_address_t *daddr, xfrm_address_t *saddr,
1301 struct flowi *fl, struct xfrm_tmpl *tmpl,
1302 struct xfrm_policy *pol, int *err,
1303 unsigned short family);
Jamal Hadi Salim628529b2007-07-02 22:41:14 -07001304extern struct xfrm_state * xfrm_stateonly_find(xfrm_address_t *daddr,
1305 xfrm_address_t *saddr,
1306 unsigned short family,
1307 u8 mode, u8 proto, u32 reqid);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001308extern int xfrm_state_check_expire(struct xfrm_state *x);
1309extern void xfrm_state_insert(struct xfrm_state *x);
1310extern int xfrm_state_add(struct xfrm_state *x);
1311extern int xfrm_state_update(struct xfrm_state *x);
Al Viroa94cfd12006-09-27 18:47:24 -07001312extern struct xfrm_state *xfrm_state_lookup(xfrm_address_t *daddr, __be32 spi, u8 proto, unsigned short family);
Masahide NAKAMURAeb2971b2006-08-23 17:56:04 -07001313extern struct xfrm_state *xfrm_state_lookup_byaddr(xfrm_address_t *daddr, xfrm_address_t *saddr, u8 proto, unsigned short family);
Masahide NAKAMURA41a49cc2006-08-23 22:48:31 -07001314#ifdef CONFIG_XFRM_SUB_POLICY
1315extern int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1316 int n, unsigned short family);
1317extern int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1318 int n, unsigned short family);
1319#else
1320static inline int xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src,
1321 int n, unsigned short family)
1322{
1323 return -ENOSYS;
1324}
1325
1326static inline int xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src,
1327 int n, unsigned short family)
1328{
1329 return -ENOSYS;
1330}
1331#endif
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001332
1333struct xfrmk_sadinfo {
1334 u32 sadhcnt; /* current hash bkts */
1335 u32 sadhmcnt; /* max allowed hash bkts */
1336 u32 sadcnt; /* current running count */
1337};
1338
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001339struct xfrmk_spdinfo {
1340 u32 incnt;
1341 u32 outcnt;
1342 u32 fwdcnt;
1343 u32 inscnt;
1344 u32 outscnt;
1345 u32 fwdscnt;
1346 u32 spdhcnt;
1347 u32 spdhmcnt;
1348};
1349
Linus Torvalds1da177e2005-04-16 15:20:36 -07001350extern struct xfrm_state *xfrm_find_acq_byseq(u32 seq);
Jamal Hadi Salim26b15da2005-06-18 22:42:13 -07001351extern int xfrm_state_delete(struct xfrm_state *x);
Joy Latten4aa2e622007-06-04 19:05:57 -04001352extern int xfrm_state_flush(u8 proto, struct xfrm_audit *audit_info);
Jamal Hadi Salimaf11e312007-05-04 12:55:13 -07001353extern void xfrm_sad_getinfo(struct xfrmk_sadinfo *si);
Jamal Hadi Salim5a6d3412007-05-04 12:55:39 -07001354extern void xfrm_spd_getinfo(struct xfrmk_spdinfo *si);
Paul Mooreafeb14b2007-12-21 14:58:11 -08001355extern int xfrm_replay_check(struct xfrm_state *x,
1356 struct sk_buff *skb, __be32 seq);
Al Viro61f46272006-09-27 18:48:33 -07001357extern void xfrm_replay_advance(struct xfrm_state *x, __be32 seq);
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001358extern void xfrm_replay_notify(struct xfrm_state *x, int event);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001359extern int xfrm_state_mtu(struct xfrm_state *x, int mtu);
Herbert Xu72cb6962005-06-20 13:18:08 -07001360extern int xfrm_init_state(struct xfrm_state *x);
Herbert Xu227620e2007-11-13 21:41:28 -08001361extern int xfrm_prepare_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu716062f2007-11-13 21:44:23 -08001362extern int xfrm_input(struct sk_buff *skb, int nexthdr, __be32 spi,
1363 int encap_type);
Herbert Xu1bf06cd2007-11-19 18:50:17 -08001364extern int xfrm_input_resume(struct sk_buff *skb, int nexthdr);
Herbert Xuc6581a42007-11-13 21:43:43 -08001365extern int xfrm_output_resume(struct sk_buff *skb, int err);
Herbert Xu406ef772007-10-08 17:16:30 -07001366extern int xfrm_output(struct sk_buff *skb);
Kazunori MIYAZAWAdf9dcb42008-03-24 14:51:51 -07001367extern int xfrm_inner_extract_output(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001368extern int xfrm4_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001369extern int xfrm4_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001370extern int xfrm4_rcv_encap(struct sk_buff *skb, int nexthdr, __be32 spi,
1371 int encap_type);
Herbert Xu716062f2007-11-13 21:44:23 -08001372extern int xfrm4_transport_finish(struct sk_buff *skb, int async);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001373extern int xfrm4_rcv(struct sk_buff *skb);
Herbert Xuc4541b42007-10-17 21:28:53 -07001374
1375static inline int xfrm4_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)
1376{
1377 return xfrm4_rcv_encap(skb, nexthdr, spi, 0);
1378}
1379
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001380extern int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1381extern int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001382extern int xfrm4_output(struct sk_buff *skb);
Kazunori MIYAZAWAc0d56402007-02-13 12:54:47 -08001383extern int xfrm4_tunnel_register(struct xfrm_tunnel *handler, unsigned short family);
1384extern int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001385extern int xfrm6_extract_header(struct sk_buff *skb);
Herbert Xu227620e2007-11-13 21:41:28 -08001386extern int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);
Herbert Xu33b5ecb2007-10-17 21:29:25 -07001387extern int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);
Herbert Xu716062f2007-11-13 21:44:23 -08001388extern int xfrm6_transport_finish(struct sk_buff *skb, int async);
Herbert Xue5bbef22007-10-15 12:50:28 -07001389extern int xfrm6_rcv(struct sk_buff *skb);
Masahide NAKAMURAfbd9a5b2006-08-23 18:08:21 -07001390extern int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,
1391 xfrm_address_t *saddr, u8 proto);
Kazunori MIYAZAWA73d605d2007-02-13 12:55:55 -08001392extern int xfrm6_tunnel_register(struct xfrm6_tunnel *handler, unsigned short family);
1393extern int xfrm6_tunnel_deregister(struct xfrm6_tunnel *handler, unsigned short family);
Al Viro8c689a62006-11-08 00:20:21 -08001394extern __be32 xfrm6_tunnel_alloc_spi(xfrm_address_t *saddr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001395extern void xfrm6_tunnel_free_spi(xfrm_address_t *saddr);
Al Viro8c689a62006-11-08 00:20:21 -08001396extern __be32 xfrm6_tunnel_spi_lookup(xfrm_address_t *saddr);
Herbert Xu36cf9ac2007-11-13 21:40:52 -08001397extern int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb);
1398extern int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001399extern int xfrm6_output(struct sk_buff *skb);
Masahide NAKAMURAaee5adb2006-08-23 17:57:28 -07001400extern int xfrm6_find_1stfragopt(struct xfrm_state *x, struct sk_buff *skb,
1401 u8 **prevhdr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001402
1403#ifdef CONFIG_XFRM
James Chapman067b2072007-07-05 17:08:05 -07001404extern int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001405extern int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406#else
1407static inline int xfrm_user_policy(struct sock *sk, int optname, u8 __user *optval, int optlen)
1408{
1409 return -ENOPROTOOPT;
1410}
1411
James Chapman067b2072007-07-05 17:08:05 -07001412static inline int xfrm4_udp_encap_rcv(struct sock *sk, struct sk_buff *skb)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413{
1414 /* should not happen */
1415 kfree_skb(skb);
1416 return 0;
1417}
Linus Torvalds1da177e2005-04-16 15:20:36 -07001418#endif
1419
Al Virodd0fc662005-10-07 07:46:04 +01001420struct xfrm_policy *xfrm_policy_alloc(gfp_t gfp);
Timo Teras4c563f72008-02-28 21:31:08 -08001421
1422static inline void xfrm_policy_walk_init(struct xfrm_policy_walk *walk, u8 type)
1423{
1424 walk->cur_type = XFRM_POLICY_TYPE_MAIN;
1425 walk->type = type;
1426 walk->policy = NULL;
1427 walk->count = 0;
1428}
1429
1430static inline void xfrm_policy_walk_done(struct xfrm_policy_walk *walk)
1431{
1432 if (walk->policy != NULL) {
1433 xfrm_pol_put(walk->policy);
1434 walk->policy = NULL;
1435 }
1436}
1437
1438extern int xfrm_policy_walk(struct xfrm_policy_walk *walk,
1439 int (*func)(struct xfrm_policy *, int, int, void*), void *);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001440int xfrm_policy_insert(int dir, struct xfrm_policy *policy, int excl);
Masahide NAKAMURA4e81bb82006-08-23 22:43:30 -07001441struct xfrm_policy *xfrm_policy_bysel_ctx(u8 type, int dir,
1442 struct xfrm_selector *sel,
Eric Parisef41aaa2007-03-07 15:37:58 -08001443 struct xfrm_sec_ctx *ctx, int delete,
1444 int *err);
1445struct xfrm_policy *xfrm_policy_byid(u8, int dir, u32 id, int delete, int *err);
Joy Latten4aa2e622007-06-04 19:05:57 -04001446int xfrm_policy_flush(u8 type, struct xfrm_audit *audit_info);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001447u32 xfrm_get_acqseq(void);
Herbert Xu658b2192007-10-09 13:29:52 -07001448extern int xfrm_alloc_spi(struct xfrm_state *x, u32 minspi, u32 maxspi);
Joy Latten161a09e2006-11-27 13:11:54 -06001449struct xfrm_state * xfrm_find_acq(u8 mode, u32 reqid, u8 proto,
1450 xfrm_address_t *daddr, xfrm_address_t *saddr,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451 int create, unsigned short family);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001452extern int xfrm_sk_policy_insert(struct sock *sk, int dir, struct xfrm_policy *pol);
Venkat Yekkirala5b368e62006-10-05 15:42:18 -05001453extern int xfrm_bundle_ok(struct xfrm_policy *pol, struct xfrm_dst *xdst,
1454 struct flowi *fl, int family, int strict);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001455
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001456#ifdef CONFIG_XFRM_MIGRATE
1457extern int km_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1458 struct xfrm_migrate *m, int num_bundles);
1459extern struct xfrm_state * xfrm_migrate_state_find(struct xfrm_migrate *m);
1460extern struct xfrm_state * xfrm_state_migrate(struct xfrm_state *x,
1461 struct xfrm_migrate *m);
1462extern int xfrm_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1463 struct xfrm_migrate *m, int num_bundles);
1464#endif
1465
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466extern wait_queue_head_t km_waitq;
Al Viro5d36b182006-11-08 00:24:06 -08001467extern int km_new_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr, __be16 sport);
Jamal Hadi Salim6c5c8ca2006-03-20 19:17:25 -08001468extern void km_policy_expired(struct xfrm_policy *pol, int dir, int hard, u32 pid);
Masahide NAKAMURA97a64b42006-08-23 20:44:06 -07001469extern int km_report(u8 proto, struct xfrm_selector *sel, xfrm_address_t *addr);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470
1471extern void xfrm_input_init(void);
Al Viro6067b2b2006-09-27 18:47:59 -07001472extern int xfrm_parse_spi(struct sk_buff *skb, u8 nexthdr, __be32 *spi, __be32 *seq);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001473
1474extern void xfrm_probe_algs(void);
1475extern int xfrm_count_auth_supported(void);
1476extern int xfrm_count_enc_supported(void);
1477extern struct xfrm_algo_desc *xfrm_aalg_get_byidx(unsigned int idx);
1478extern struct xfrm_algo_desc *xfrm_ealg_get_byidx(unsigned int idx);
1479extern struct xfrm_algo_desc *xfrm_aalg_get_byid(int alg_id);
1480extern struct xfrm_algo_desc *xfrm_ealg_get_byid(int alg_id);
1481extern struct xfrm_algo_desc *xfrm_calg_get_byid(int alg_id);
1482extern struct xfrm_algo_desc *xfrm_aalg_get_byname(char *name, int probe);
1483extern struct xfrm_algo_desc *xfrm_ealg_get_byname(char *name, int probe);
1484extern struct xfrm_algo_desc *xfrm_calg_get_byname(char *name, int probe);
Herbert Xu1a6509d2008-01-28 19:37:29 -08001485extern struct xfrm_algo_desc *xfrm_aead_get_byname(char *name, int icv_len,
1486 int probe);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
Herbert Xu07d4ee52006-08-20 14:24:50 +10001488struct hash_desc;
Herbert Xu9409f382006-08-06 19:49:12 +10001489struct scatterlist;
Herbert Xu07d4ee52006-08-20 14:24:50 +10001490typedef int (icv_update_fn_t)(struct hash_desc *, struct scatterlist *,
1491 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001492
Herbert Xu07d4ee52006-08-20 14:24:50 +10001493extern int skb_icv_walk(const struct sk_buff *skb, struct hash_desc *tfm,
1494 int offset, int len, icv_update_fn_t icv_update);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001495
1496static inline int xfrm_addr_cmp(xfrm_address_t *a, xfrm_address_t *b,
1497 int family)
1498{
1499 switch (family) {
1500 default:
1501 case AF_INET:
Al Viro8c689a62006-11-08 00:20:21 -08001502 return (__force __u32)a->a4 - (__force __u32)b->a4;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001503 case AF_INET6:
1504 return ipv6_addr_cmp((struct in6_addr *)a,
1505 (struct in6_addr *)b);
1506 }
1507}
1508
Herbert Xu77d8d7a2005-10-05 12:15:12 -07001509static inline int xfrm_policy_id2dir(u32 index)
1510{
1511 return index & 7;
1512}
1513
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001514static inline int xfrm_aevent_is_on(void)
1515{
Patrick McHardybe336902006-03-20 22:40:54 -08001516 struct sock *nlsk;
1517 int ret = 0;
1518
1519 rcu_read_lock();
1520 nlsk = rcu_dereference(xfrm_nl);
1521 if (nlsk)
1522 ret = netlink_has_listeners(nlsk, XFRMNLGRP_AEVENTS);
1523 rcu_read_unlock();
1524 return ret;
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001525}
1526
Eric Dumazet0f99be02008-01-08 23:39:06 -08001527static inline int xfrm_alg_len(struct xfrm_algo *alg)
1528{
1529 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
1530}
1531
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001532#ifdef CONFIG_XFRM_MIGRATE
1533static inline struct xfrm_algo *xfrm_algo_clone(struct xfrm_algo *orig)
1534{
Eric Dumazet0f99be02008-01-08 23:39:06 -08001535 return kmemdup(orig, xfrm_alg_len(orig), GFP_KERNEL);
Shinta Sugimoto80c9aba2007-02-08 13:11:42 -08001536}
1537
1538static inline void xfrm_states_put(struct xfrm_state **states, int n)
1539{
1540 int i;
1541 for (i = 0; i < n; i++)
1542 xfrm_state_put(*(states + i));
1543}
1544
1545static inline void xfrm_states_delete(struct xfrm_state **states, int n)
1546{
1547 int i;
1548 for (i = 0; i < n; i++)
1549 xfrm_state_delete(*(states + i));
1550}
1551#endif
Jamal Hadi Salimf8cd5482006-03-20 19:15:11 -08001552
Herbert Xu00501122007-12-11 01:53:43 -08001553static inline struct xfrm_state *xfrm_input_state(struct sk_buff *skb)
1554{
1555 return skb->sp->xvec[skb->sp->len - 1];
1556}
1557
Linus Torvalds1da177e2005-04-16 15:20:36 -07001558#endif /* _NET_XFRM_H */