?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
[XFRM] netlink: Inline attach_encap_tmpl(), attach_sec_ctx(), and attach_one_addr()
[linux-2.6/verdex.git] / net / xfrm / xfrm_user.c
blob9e516f5cbb5e2bb50fde5f5ccb6398bd0c7c8274
1 /* xfrm_user.c: User interface to configure xfrm engine.
2 *
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
4 *
5 * Changes:
6 * Mitsuru KANDA @USAGI
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
9 * IPv6 support
10 *
11 */
12
13 #include <linux/crypto.h>
14 #include <linux/module.h>
15 #include <linux/kernel.h>
16 #include <linux/types.h>
17 #include <linux/slab.h>
18 #include <linux/socket.h>
19 #include <linux/string.h>
20 #include <linux/net.h>
21 #include <linux/skbuff.h>
22 #include <linux/pfkeyv2.h>
23 #include <linux/ipsec.h>
24 #include <linux/init.h>
25 #include <linux/security.h>
26 #include <net/sock.h>
27 #include <net/xfrm.h>
28 #include <net/netlink.h>
29 #include <asm/uaccess.h>
30 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
31 #include <linux/in6.h>
32 #endif
33 #include <linux/audit.h>
34
35 static inline int alg_len(struct xfrm_algo *alg)
36 {
37 return sizeof(*alg) + ((alg->alg_key_len + 7) / 8);
38 }
39
40 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
41 {
42 struct nlattr *rt = attrs[type];
43 struct xfrm_algo *algp;
44
45 if (!rt)
46 return 0;
47
48 algp = nla_data(rt);
49 if (nla_len(rt) < alg_len(algp))
50 return -EINVAL;
51
52 switch (type) {
53 case XFRMA_ALG_AUTH:
54 if (!algp->alg_key_len &&
55 strcmp(algp->alg_name, "digest_null") != 0)
56 return -EINVAL;
57 break;
58
59 case XFRMA_ALG_CRYPT:
60 if (!algp->alg_key_len &&
61 strcmp(algp->alg_name, "cipher_null") != 0)
62 return -EINVAL;
63 break;
64
65 case XFRMA_ALG_COMP:
66 /* Zero length keys are legal. */
67 break;
68
69 default:
70 return -EINVAL;
71 }
72
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
74 return 0;
75 }
76
77 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
78 xfrm_address_t **addrp)
79 {
80 struct nlattr *rt = attrs[type];
81
82 if (rt && addrp)
83 *addrp = nla_data(rt);
84 }
85
86 static inline int verify_sec_ctx_len(struct nlattr **attrs)
87 {
88 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
89 struct xfrm_user_sec_ctx *uctx;
90
91 if (!rt)
92 return 0;
93
94 uctx = nla_data(rt);
95 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
96 return -EINVAL;
97
98 return 0;
99 }
100
101
102 static int verify_newsa_info(struct xfrm_usersa_info *p,
103 struct nlattr **attrs)
104 {
105 int err;
106
107 err = -EINVAL;
108 switch (p->family) {
109 case AF_INET:
110 break;
111
112 case AF_INET6:
113 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
114 break;
115 #else
116 err = -EAFNOSUPPORT;
117 goto out;
118 #endif
119
120 default:
121 goto out;
122 }
123
124 err = -EINVAL;
125 switch (p->id.proto) {
126 case IPPROTO_AH:
127 if (!attrs[XFRMA_ALG_AUTH] ||
128 attrs[XFRMA_ALG_CRYPT] ||
129 attrs[XFRMA_ALG_COMP])
130 goto out;
131 break;
132
133 case IPPROTO_ESP:
134 if ((!attrs[XFRMA_ALG_AUTH] &&
135 !attrs[XFRMA_ALG_CRYPT]) ||
136 attrs[XFRMA_ALG_COMP])
137 goto out;
138 break;
139
140 case IPPROTO_COMP:
141 if (!attrs[XFRMA_ALG_COMP] ||
142 attrs[XFRMA_ALG_AUTH] ||
143 attrs[XFRMA_ALG_CRYPT])
144 goto out;
145 break;
146
147 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
148 case IPPROTO_DSTOPTS:
149 case IPPROTO_ROUTING:
150 if (attrs[XFRMA_ALG_COMP] ||
151 attrs[XFRMA_ALG_AUTH] ||
152 attrs[XFRMA_ALG_CRYPT] ||
153 attrs[XFRMA_ENCAP] ||
154 attrs[XFRMA_SEC_CTX] ||
155 !attrs[XFRMA_COADDR])
156 goto out;
157 break;
158 #endif
159
160 default:
161 goto out;
162 }
163
164 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
165 goto out;
166 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
167 goto out;
168 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
169 goto out;
170 if ((err = verify_sec_ctx_len(attrs)))
171 goto out;
172
173 err = -EINVAL;
174 switch (p->mode) {
175 case XFRM_MODE_TRANSPORT:
176 case XFRM_MODE_TUNNEL:
177 case XFRM_MODE_ROUTEOPTIMIZATION:
178 case XFRM_MODE_BEET:
179 break;
180
181 default:
182 goto out;
183 }
184
185 err = 0;
186
187 out:
188 return err;
189 }
190
191 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
192 struct xfrm_algo_desc *(*get_byname)(char *, int),
193 struct nlattr *rta)
194 {
195 struct xfrm_algo *p, *ualg;
196 struct xfrm_algo_desc *algo;
197
198 if (!rta)
199 return 0;
200
201 ualg = nla_data(rta);
202
203 algo = get_byname(ualg->alg_name, 1);
204 if (!algo)
205 return -ENOSYS;
206 *props = algo->desc.sadb_alg_id;
207
208 p = kmemdup(ualg, alg_len(ualg), GFP_KERNEL);
209 if (!p)
210 return -ENOMEM;
211
212 strcpy(p->alg_name, algo->name);
213 *algpp = p;
214 return 0;
215 }
216
217 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
218 {
219 int len = 0;
220
221 if (xfrm_ctx) {
222 len += sizeof(struct xfrm_user_sec_ctx);
223 len += xfrm_ctx->ctx_len;
224 }
225 return len;
226 }
227
228 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
229 {
230 memcpy(&x->id, &p->id, sizeof(x->id));
231 memcpy(&x->sel, &p->sel, sizeof(x->sel));
232 memcpy(&x->lft, &p->lft, sizeof(x->lft));
233 x->props.mode = p->mode;
234 x->props.replay_window = p->replay_window;
235 x->props.reqid = p->reqid;
236 x->props.family = p->family;
237 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
238 x->props.flags = p->flags;
239
240 /*
241 * Set inner address family if the KM left it as zero.
242 * See comment in validate_tmpl.
243 */
244 if (!x->sel.family)
245 x->sel.family = p->family;
246 }
247
248 /*
249 * someday when pfkey also has support, we could have the code
250 * somehow made shareable and move it to xfrm_state.c - JHS
251 *
252 */
253 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs)
254 {
255 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
256 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
257 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
258 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
259
260 if (rp) {
261 struct xfrm_replay_state *replay;
262 replay = nla_data(rp);
263 memcpy(&x->replay, replay, sizeof(*replay));
264 memcpy(&x->preplay, replay, sizeof(*replay));
265 }
266
267 if (lt) {
268 struct xfrm_lifetime_cur *ltime;
269 ltime = nla_data(lt);
270 x->curlft.bytes = ltime->bytes;
271 x->curlft.packets = ltime->packets;
272 x->curlft.add_time = ltime->add_time;
273 x->curlft.use_time = ltime->use_time;
274 }
275
276 if (et)
277 x->replay_maxage = nla_get_u32(et);
278
279 if (rt)
280 x->replay_maxdiff = nla_get_u32(rt);
281 }
282
283 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
284 struct nlattr **attrs,
285 int *errp)
286 {
287 struct xfrm_state *x = xfrm_state_alloc();
288 int err = -ENOMEM;
289
290 if (!x)
291 goto error_no_put;
292
293 copy_from_user_state(x, p);
294
295 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
296 xfrm_aalg_get_byname,
297 attrs[XFRMA_ALG_AUTH])))
298 goto error;
299 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
300 xfrm_ealg_get_byname,
301 attrs[XFRMA_ALG_CRYPT])))
302 goto error;
303 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
304 xfrm_calg_get_byname,
305 attrs[XFRMA_ALG_COMP])))
306 goto error;
307
308 if (attrs[XFRMA_ENCAP]) {
309 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
310 sizeof(*x->encap), GFP_KERNEL);
311 if (x->encap == NULL)
312 goto error;
313 }
314
315 if (attrs[XFRMA_COADDR]) {
316 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
317 sizeof(*x->coaddr), GFP_KERNEL);
318 if (x->coaddr == NULL)
319 goto error;
320 }
321
322 err = xfrm_init_state(x);
323 if (err)
324 goto error;
325
326 if (attrs[XFRMA_SEC_CTX] &&
327 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
328 goto error;
329
330 x->km.seq = p->seq;
331 x->replay_maxdiff = sysctl_xfrm_aevent_rseqth;
332 /* sysctl_xfrm_aevent_etime is in 100ms units */
333 x->replay_maxage = (sysctl_xfrm_aevent_etime*HZ)/XFRM_AE_ETH_M;
334 x->preplay.bitmap = 0;
335 x->preplay.seq = x->replay.seq+x->replay_maxdiff;
336 x->preplay.oseq = x->replay.oseq +x->replay_maxdiff;
337
338 /* override default values from above */
339
340 xfrm_update_ae_params(x, attrs);
341
342 return x;
343
344 error:
345 x->km.state = XFRM_STATE_DEAD;
346 xfrm_state_put(x);
347 error_no_put:
348 *errp = err;
349 return NULL;
350 }
351
352 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
353 struct nlattr **attrs)
354 {
355 struct xfrm_usersa_info *p = nlmsg_data(nlh);
356 struct xfrm_state *x;
357 int err;
358 struct km_event c;
359
360 err = verify_newsa_info(p, attrs);
361 if (err)
362 return err;
363
364 x = xfrm_state_construct(p, attrs, &err);
365 if (!x)
366 return err;
367
368 xfrm_state_hold(x);
369 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
370 err = xfrm_state_add(x);
371 else
372 err = xfrm_state_update(x);
373
374 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
375 AUDIT_MAC_IPSEC_ADDSA, err ? 0 : 1, NULL, x);
376
377 if (err < 0) {
378 x->km.state = XFRM_STATE_DEAD;
379 __xfrm_state_put(x);
380 goto out;
381 }
382
383 c.seq = nlh->nlmsg_seq;
384 c.pid = nlh->nlmsg_pid;
385 c.event = nlh->nlmsg_type;
386
387 km_state_notify(x, &c);
388 out:
389 xfrm_state_put(x);
390 return err;
391 }
392
393 static struct xfrm_state *xfrm_user_state_lookup(struct xfrm_usersa_id *p,
394 struct nlattr **attrs,
395 int *errp)
396 {
397 struct xfrm_state *x = NULL;
398 int err;
399
400 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
401 err = -ESRCH;
402 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
403 } else {
404 xfrm_address_t *saddr = NULL;
405
406 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
407 if (!saddr) {
408 err = -EINVAL;
409 goto out;
410 }
411
412 err = -ESRCH;
413 x = xfrm_state_lookup_byaddr(&p->daddr, saddr, p->proto,
414 p->family);
415 }
416
417 out:
418 if (!x && errp)
419 *errp = err;
420 return x;
421 }
422
423 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
424 struct nlattr **attrs)
425 {
426 struct xfrm_state *x;
427 int err = -ESRCH;
428 struct km_event c;
429 struct xfrm_usersa_id *p = nlmsg_data(nlh);
430
431 x = xfrm_user_state_lookup(p, attrs, &err);
432 if (x == NULL)
433 return err;
434
435 if ((err = security_xfrm_state_delete(x)) != 0)
436 goto out;
437
438 if (xfrm_state_kern(x)) {
439 err = -EPERM;
440 goto out;
441 }
442
443 err = xfrm_state_delete(x);
444
445 if (err < 0)
446 goto out;
447
448 c.seq = nlh->nlmsg_seq;
449 c.pid = nlh->nlmsg_pid;
450 c.event = nlh->nlmsg_type;
451 km_state_notify(x, &c);
452
453 out:
454 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
455 AUDIT_MAC_IPSEC_DELSA, err ? 0 : 1, NULL, x);
456 xfrm_state_put(x);
457 return err;
458 }
459
460 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
461 {
462 memcpy(&p->id, &x->id, sizeof(p->id));
463 memcpy(&p->sel, &x->sel, sizeof(p->sel));
464 memcpy(&p->lft, &x->lft, sizeof(p->lft));
465 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
466 memcpy(&p->stats, &x->stats, sizeof(p->stats));
467 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
468 p->mode = x->props.mode;
469 p->replay_window = x->props.replay_window;
470 p->reqid = x->props.reqid;
471 p->family = x->props.family;
472 p->flags = x->props.flags;
473 p->seq = x->km.seq;
474 }
475
476 struct xfrm_dump_info {
477 struct sk_buff *in_skb;
478 struct sk_buff *out_skb;
479 u32 nlmsg_seq;
480 u16 nlmsg_flags;
481 int start_idx;
482 int this_idx;
483 };
484
485 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
486 {
487 int ctx_size = sizeof(struct xfrm_sec_ctx) + s->ctx_len;
488 struct xfrm_user_sec_ctx *uctx;
489 struct nlattr *attr;
490
491 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
492 if (attr == NULL)
493 return -EMSGSIZE;
494
495 uctx = nla_data(attr);
496 uctx->exttype = XFRMA_SEC_CTX;
497 uctx->len = ctx_size;
498 uctx->ctx_doi = s->ctx_doi;
499 uctx->ctx_alg = s->ctx_alg;
500 uctx->ctx_len = s->ctx_len;
501 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
502
503 return 0;
504 }
505
506 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
507 {
508 struct xfrm_dump_info *sp = ptr;
509 struct sk_buff *in_skb = sp->in_skb;
510 struct sk_buff *skb = sp->out_skb;
511 struct xfrm_usersa_info *p;
512 struct nlmsghdr *nlh;
513
514 if (sp->this_idx < sp->start_idx)
515 goto out;
516
517 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
518 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
519 if (nlh == NULL)
520 return -EMSGSIZE;
521
522 p = nlmsg_data(nlh);
523 copy_to_user_state(x, p);
524
525 if (x->aalg)
526 NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg);
527 if (x->ealg)
528 NLA_PUT(skb, XFRMA_ALG_CRYPT, alg_len(x->ealg), x->ealg);
529 if (x->calg)
530 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
531
532 if (x->encap)
533 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
534
535 if (x->security && copy_sec_ctx(x->security, skb) < 0)
536 goto nla_put_failure;
537
538 if (x->coaddr)
539 NLA_PUT(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
540
541 if (x->lastused)
542 NLA_PUT_U64(skb, XFRMA_LASTUSED, x->lastused);
543
544 nlmsg_end(skb, nlh);
545 out:
546 sp->this_idx++;
547 return 0;
548
549 nla_put_failure:
550 nlmsg_cancel(skb, nlh);
551 return -EMSGSIZE;
552 }
553
554 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
555 {
556 struct xfrm_dump_info info;
557
558 info.in_skb = cb->skb;
559 info.out_skb = skb;
560 info.nlmsg_seq = cb->nlh->nlmsg_seq;
561 info.nlmsg_flags = NLM_F_MULTI;
562 info.this_idx = 0;
563 info.start_idx = cb->args[0];
564 (void) xfrm_state_walk(0, dump_one_state, &info);
565 cb->args[0] = info.this_idx;
566
567 return skb->len;
568 }
569
570 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
571 struct xfrm_state *x, u32 seq)
572 {
573 struct xfrm_dump_info info;
574 struct sk_buff *skb;
575
576 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
577 if (!skb)
578 return ERR_PTR(-ENOMEM);
579
580 info.in_skb = in_skb;
581 info.out_skb = skb;
582 info.nlmsg_seq = seq;
583 info.nlmsg_flags = 0;
584 info.this_idx = info.start_idx = 0;
585
586 if (dump_one_state(x, 0, &info)) {
587 kfree_skb(skb);
588 return NULL;
589 }
590
591 return skb;
592 }
593
594 static inline size_t xfrm_spdinfo_msgsize(void)
595 {
596 return NLMSG_ALIGN(4)
597 + nla_total_size(sizeof(struct xfrmu_spdinfo))
598 + nla_total_size(sizeof(struct xfrmu_spdhinfo));
599 }
600
601 static int build_spdinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
602 {
603 struct xfrmk_spdinfo si;
604 struct xfrmu_spdinfo spc;
605 struct xfrmu_spdhinfo sph;
606 struct nlmsghdr *nlh;
607 u32 *f;
608
609 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
610 if (nlh == NULL) /* shouldnt really happen ... */
611 return -EMSGSIZE;
612
613 f = nlmsg_data(nlh);
614 *f = flags;
615 xfrm_spd_getinfo(&si);
616 spc.incnt = si.incnt;
617 spc.outcnt = si.outcnt;
618 spc.fwdcnt = si.fwdcnt;
619 spc.inscnt = si.inscnt;
620 spc.outscnt = si.outscnt;
621 spc.fwdscnt = si.fwdscnt;
622 sph.spdhcnt = si.spdhcnt;
623 sph.spdhmcnt = si.spdhmcnt;
624
625 NLA_PUT(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
626 NLA_PUT(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
627
628 return nlmsg_end(skb, nlh);
629
630 nla_put_failure:
631 nlmsg_cancel(skb, nlh);
632 return -EMSGSIZE;
633 }
634
635 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
636 struct nlattr **attrs)
637 {
638 struct sk_buff *r_skb;
639 u32 *flags = nlmsg_data(nlh);
640 u32 spid = NETLINK_CB(skb).pid;
641 u32 seq = nlh->nlmsg_seq;
642
643 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
644 if (r_skb == NULL)
645 return -ENOMEM;
646
647 if (build_spdinfo(r_skb, spid, seq, *flags) < 0)
648 BUG();
649
650 return nlmsg_unicast(xfrm_nl, r_skb, spid);
651 }
652
653 static inline size_t xfrm_sadinfo_msgsize(void)
654 {
655 return NLMSG_ALIGN(4)
656 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
657 + nla_total_size(4); /* XFRMA_SAD_CNT */
658 }
659
660 static int build_sadinfo(struct sk_buff *skb, u32 pid, u32 seq, u32 flags)
661 {
662 struct xfrmk_sadinfo si;
663 struct xfrmu_sadhinfo sh;
664 struct nlmsghdr *nlh;
665 u32 *f;
666
667 nlh = nlmsg_put(skb, pid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
668 if (nlh == NULL) /* shouldnt really happen ... */
669 return -EMSGSIZE;
670
671 f = nlmsg_data(nlh);
672 *f = flags;
673 xfrm_sad_getinfo(&si);
674
675 sh.sadhmcnt = si.sadhmcnt;
676 sh.sadhcnt = si.sadhcnt;
677
678 NLA_PUT_U32(skb, XFRMA_SAD_CNT, si.sadcnt);
679 NLA_PUT(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
680
681 return nlmsg_end(skb, nlh);
682
683 nla_put_failure:
684 nlmsg_cancel(skb, nlh);
685 return -EMSGSIZE;
686 }
687
688 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
689 struct nlattr **attrs)
690 {
691 struct sk_buff *r_skb;
692 u32 *flags = nlmsg_data(nlh);
693 u32 spid = NETLINK_CB(skb).pid;
694 u32 seq = nlh->nlmsg_seq;
695
696 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
697 if (r_skb == NULL)
698 return -ENOMEM;
699
700 if (build_sadinfo(r_skb, spid, seq, *flags) < 0)
701 BUG();
702
703 return nlmsg_unicast(xfrm_nl, r_skb, spid);
704 }
705
706 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
707 struct nlattr **attrs)
708 {
709 struct xfrm_usersa_id *p = nlmsg_data(nlh);
710 struct xfrm_state *x;
711 struct sk_buff *resp_skb;
712 int err = -ESRCH;
713
714 x = xfrm_user_state_lookup(p, attrs, &err);
715 if (x == NULL)
716 goto out_noput;
717
718 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
719 if (IS_ERR(resp_skb)) {
720 err = PTR_ERR(resp_skb);
721 } else {
722 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
723 }
724 xfrm_state_put(x);
725 out_noput:
726 return err;
727 }
728
729 static int verify_userspi_info(struct xfrm_userspi_info *p)
730 {
731 switch (p->info.id.proto) {
732 case IPPROTO_AH:
733 case IPPROTO_ESP:
734 break;
735
736 case IPPROTO_COMP:
737 /* IPCOMP spi is 16-bits. */
738 if (p->max >= 0x10000)
739 return -EINVAL;
740 break;
741
742 default:
743 return -EINVAL;
744 }
745
746 if (p->min > p->max)
747 return -EINVAL;
748
749 return 0;
750 }
751
752 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
753 struct nlattr **attrs)
754 {
755 struct xfrm_state *x;
756 struct xfrm_userspi_info *p;
757 struct sk_buff *resp_skb;
758 xfrm_address_t *daddr;
759 int family;
760 int err;
761
762 p = nlmsg_data(nlh);
763 err = verify_userspi_info(p);
764 if (err)
765 goto out_noput;
766
767 family = p->info.family;
768 daddr = &p->info.id.daddr;
769
770 x = NULL;
771 if (p->info.seq) {
772 x = xfrm_find_acq_byseq(p->info.seq);
773 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
774 xfrm_state_put(x);
775 x = NULL;
776 }
777 }
778
779 if (!x)
780 x = xfrm_find_acq(p->info.mode, p->info.reqid,
781 p->info.id.proto, daddr,
782 &p->info.saddr, 1,
783 family);
784 err = -ENOENT;
785 if (x == NULL)
786 goto out_noput;
787
788 resp_skb = ERR_PTR(-ENOENT);
789
790 spin_lock_bh(&x->lock);
791 if (x->km.state != XFRM_STATE_DEAD) {
792 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
793 if (x->id.spi)
794 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
795 }
796 spin_unlock_bh(&x->lock);
797
798 if (IS_ERR(resp_skb)) {
799 err = PTR_ERR(resp_skb);
800 goto out;
801 }
802
803 err = nlmsg_unicast(xfrm_nl, resp_skb, NETLINK_CB(skb).pid);
804
805 out:
806 xfrm_state_put(x);
807 out_noput:
808 return err;
809 }
810
811 static int verify_policy_dir(u8 dir)
812 {
813 switch (dir) {
814 case XFRM_POLICY_IN:
815 case XFRM_POLICY_OUT:
816 case XFRM_POLICY_FWD:
817 break;
818
819 default:
820 return -EINVAL;
821 }
822
823 return 0;
824 }
825
826 static int verify_policy_type(u8 type)
827 {
828 switch (type) {
829 case XFRM_POLICY_TYPE_MAIN:
830 #ifdef CONFIG_XFRM_SUB_POLICY
831 case XFRM_POLICY_TYPE_SUB:
832 #endif
833 break;
834
835 default:
836 return -EINVAL;
837 }
838
839 return 0;
840 }
841
842 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
843 {
844 switch (p->share) {
845 case XFRM_SHARE_ANY:
846 case XFRM_SHARE_SESSION:
847 case XFRM_SHARE_USER:
848 case XFRM_SHARE_UNIQUE:
849 break;
850
851 default:
852 return -EINVAL;
853 }
854
855 switch (p->action) {
856 case XFRM_POLICY_ALLOW:
857 case XFRM_POLICY_BLOCK:
858 break;
859
860 default:
861 return -EINVAL;
862 }
863
864 switch (p->sel.family) {
865 case AF_INET:
866 break;
867
868 case AF_INET6:
869 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
870 break;
871 #else
872 return -EAFNOSUPPORT;
873 #endif
874
875 default:
876 return -EINVAL;
877 }
878
879 return verify_policy_dir(p->dir);
880 }
881
882 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
883 {
884 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
885 struct xfrm_user_sec_ctx *uctx;
886
887 if (!rt)
888 return 0;
889
890 uctx = nla_data(rt);
891 return security_xfrm_policy_alloc(pol, uctx);
892 }
893
894 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
895 int nr)
896 {
897 int i;
898
899 xp->xfrm_nr = nr;
900 for (i = 0; i < nr; i++, ut++) {
901 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
902
903 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
904 memcpy(&t->saddr, &ut->saddr,
905 sizeof(xfrm_address_t));
906 t->reqid = ut->reqid;
907 t->mode = ut->mode;
908 t->share = ut->share;
909 t->optional = ut->optional;
910 t->aalgos = ut->aalgos;
911 t->ealgos = ut->ealgos;
912 t->calgos = ut->calgos;
913 t->encap_family = ut->family;
914 }
915 }
916
917 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
918 {
919 int i;
920
921 if (nr > XFRM_MAX_DEPTH)
922 return -EINVAL;
923
924 for (i = 0; i < nr; i++) {
925 /* We never validated the ut->family value, so many
926 * applications simply leave it at zero. The check was
927 * never made and ut->family was ignored because all
928 * templates could be assumed to have the same family as
929 * the policy itself. Now that we will have ipv4-in-ipv6
930 * and ipv6-in-ipv4 tunnels, this is no longer true.
931 */
932 if (!ut[i].family)
933 ut[i].family = family;
934
935 switch (ut[i].family) {
936 case AF_INET:
937 break;
938 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
939 case AF_INET6:
940 break;
941 #endif
942 default:
943 return -EINVAL;
944 }
945 }
946
947 return 0;
948 }
949
950 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
951 {
952 struct nlattr *rt = attrs[XFRMA_TMPL];
953
954 if (!rt) {
955 pol->xfrm_nr = 0;
956 } else {
957 struct xfrm_user_tmpl *utmpl = nla_data(rt);
958 int nr = nla_len(rt) / sizeof(*utmpl);
959 int err;
960
961 err = validate_tmpl(nr, utmpl, pol->family);
962 if (err)
963 return err;
964
965 copy_templates(pol, utmpl, nr);
966 }
967 return 0;
968 }
969
970 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
971 {
972 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
973 struct xfrm_userpolicy_type *upt;
974 u8 type = XFRM_POLICY_TYPE_MAIN;
975 int err;
976
977 if (rt) {
978 upt = nla_data(rt);
979 type = upt->type;
980 }
981
982 err = verify_policy_type(type);
983 if (err)
984 return err;
985
986 *tp = type;
987 return 0;
988 }
989
990 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
991 {
992 xp->priority = p->priority;
993 xp->index = p->index;
994 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
995 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
996 xp->action = p->action;
997 xp->flags = p->flags;
998 xp->family = p->sel.family;
999 /* XXX xp->share = p->share; */
1000 }
1001
1002 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1003 {
1004 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1005 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1006 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1007 p->priority = xp->priority;
1008 p->index = xp->index;
1009 p->sel.family = xp->family;
1010 p->dir = dir;
1011 p->action = xp->action;
1012 p->flags = xp->flags;
1013 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1014 }
1015
1016 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1017 {
1018 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
1019 int err;
1020
1021 if (!xp) {
1022 *errp = -ENOMEM;
1023 return NULL;
1024 }
1025
1026 copy_from_user_policy(xp, p);
1027
1028 err = copy_from_user_policy_type(&xp->type, attrs);
1029 if (err)
1030 goto error;
1031
1032 if (!(err = copy_from_user_tmpl(xp, attrs)))
1033 err = copy_from_user_sec_ctx(xp, attrs);
1034 if (err)
1035 goto error;
1036
1037 return xp;
1038 error:
1039 *errp = err;
1040 kfree(xp);
1041 return NULL;
1042 }
1043
1044 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1045 struct nlattr **attrs)
1046 {
1047 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1048 struct xfrm_policy *xp;
1049 struct km_event c;
1050 int err;
1051 int excl;
1052
1053 err = verify_newpolicy_info(p);
1054 if (err)
1055 return err;
1056 err = verify_sec_ctx_len(attrs);
1057 if (err)
1058 return err;
1059
1060 xp = xfrm_policy_construct(p, attrs, &err);
1061 if (!xp)
1062 return err;
1063
1064 /* shouldnt excl be based on nlh flags??
1065 * Aha! this is anti-netlink really i.e more pfkey derived
1066 * in netlink excl is a flag and you wouldnt need
1067 * a type XFRM_MSG_UPDPOLICY - JHS */
1068 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1069 err = xfrm_policy_insert(p->dir, xp, excl);
1070 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1071 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1072
1073 if (err) {
1074 security_xfrm_policy_free(xp);
1075 kfree(xp);
1076 return err;
1077 }
1078
1079 c.event = nlh->nlmsg_type;
1080 c.seq = nlh->nlmsg_seq;
1081 c.pid = nlh->nlmsg_pid;
1082 km_policy_notify(xp, p->dir, &c);
1083
1084 xfrm_pol_put(xp);
1085
1086 return 0;
1087 }
1088
1089 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1090 {
1091 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1092 int i;
1093
1094 if (xp->xfrm_nr == 0)
1095 return 0;
1096
1097 for (i = 0; i < xp->xfrm_nr; i++) {
1098 struct xfrm_user_tmpl *up = &vec[i];
1099 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1100
1101 memcpy(&up->id, &kp->id, sizeof(up->id));
1102 up->family = kp->encap_family;
1103 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1104 up->reqid = kp->reqid;
1105 up->mode = kp->mode;
1106 up->share = kp->share;
1107 up->optional = kp->optional;
1108 up->aalgos = kp->aalgos;
1109 up->ealgos = kp->ealgos;
1110 up->calgos = kp->calgos;
1111 }
1112
1113 return nla_put(skb, XFRMA_TMPL,
1114 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1115 }
1116
1117 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1118 {
1119 if (x->security) {
1120 return copy_sec_ctx(x->security, skb);
1121 }
1122 return 0;
1123 }
1124
1125 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1126 {
1127 if (xp->security) {
1128 return copy_sec_ctx(xp->security, skb);
1129 }
1130 return 0;
1131 }
1132 static inline size_t userpolicy_type_attrsize(void)
1133 {
1134 #ifdef CONFIG_XFRM_SUB_POLICY
1135 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1136 #else
1137 return 0;
1138 #endif
1139 }
1140
1141 #ifdef CONFIG_XFRM_SUB_POLICY
1142 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1143 {
1144 struct xfrm_userpolicy_type upt = {
1145 .type = type,
1146 };
1147
1148 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1149 }
1150
1151 #else
1152 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1153 {
1154 return 0;
1155 }
1156 #endif
1157
1158 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1159 {
1160 struct xfrm_dump_info *sp = ptr;
1161 struct xfrm_userpolicy_info *p;
1162 struct sk_buff *in_skb = sp->in_skb;
1163 struct sk_buff *skb = sp->out_skb;
1164 struct nlmsghdr *nlh;
1165
1166 if (sp->this_idx < sp->start_idx)
1167 goto out;
1168
1169 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).pid, sp->nlmsg_seq,
1170 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1171 if (nlh == NULL)
1172 return -EMSGSIZE;
1173
1174 p = nlmsg_data(nlh);
1175 copy_to_user_policy(xp, p, dir);
1176 if (copy_to_user_tmpl(xp, skb) < 0)
1177 goto nlmsg_failure;
1178 if (copy_to_user_sec_ctx(xp, skb))
1179 goto nlmsg_failure;
1180 if (copy_to_user_policy_type(xp->type, skb) < 0)
1181 goto nlmsg_failure;
1182
1183 nlmsg_end(skb, nlh);
1184 out:
1185 sp->this_idx++;
1186 return 0;
1187
1188 nlmsg_failure:
1189 nlmsg_cancel(skb, nlh);
1190 return -EMSGSIZE;
1191 }
1192
1193 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1194 {
1195 struct xfrm_dump_info info;
1196
1197 info.in_skb = cb->skb;
1198 info.out_skb = skb;
1199 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1200 info.nlmsg_flags = NLM_F_MULTI;
1201 info.this_idx = 0;
1202 info.start_idx = cb->args[0];
1203 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_MAIN, dump_one_policy, &info);
1204 #ifdef CONFIG_XFRM_SUB_POLICY
1205 (void) xfrm_policy_walk(XFRM_POLICY_TYPE_SUB, dump_one_policy, &info);
1206 #endif
1207 cb->args[0] = info.this_idx;
1208
1209 return skb->len;
1210 }
1211
1212 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1213 struct xfrm_policy *xp,
1214 int dir, u32 seq)
1215 {
1216 struct xfrm_dump_info info;
1217 struct sk_buff *skb;
1218
1219 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1220 if (!skb)
1221 return ERR_PTR(-ENOMEM);
1222
1223 info.in_skb = in_skb;
1224 info.out_skb = skb;
1225 info.nlmsg_seq = seq;
1226 info.nlmsg_flags = 0;
1227 info.this_idx = info.start_idx = 0;
1228
1229 if (dump_one_policy(xp, dir, 0, &info) < 0) {
1230 kfree_skb(skb);
1231 return NULL;
1232 }
1233
1234 return skb;
1235 }
1236
1237 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1238 struct nlattr **attrs)
1239 {
1240 struct xfrm_policy *xp;
1241 struct xfrm_userpolicy_id *p;
1242 u8 type = XFRM_POLICY_TYPE_MAIN;
1243 int err;
1244 struct km_event c;
1245 int delete;
1246
1247 p = nlmsg_data(nlh);
1248 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1249
1250 err = copy_from_user_policy_type(&type, attrs);
1251 if (err)
1252 return err;
1253
1254 err = verify_policy_dir(p->dir);
1255 if (err)
1256 return err;
1257
1258 if (p->index)
1259 xp = xfrm_policy_byid(type, p->dir, p->index, delete, &err);
1260 else {
1261 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1262 struct xfrm_policy tmp;
1263
1264 err = verify_sec_ctx_len(attrs);
1265 if (err)
1266 return err;
1267
1268 memset(&tmp, 0, sizeof(struct xfrm_policy));
1269 if (rt) {
1270 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1271
1272 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1273 return err;
1274 }
1275 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1276 delete, &err);
1277 security_xfrm_policy_free(&tmp);
1278 }
1279 if (xp == NULL)
1280 return -ENOENT;
1281
1282 if (!delete) {
1283 struct sk_buff *resp_skb;
1284
1285 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1286 if (IS_ERR(resp_skb)) {
1287 err = PTR_ERR(resp_skb);
1288 } else {
1289 err = nlmsg_unicast(xfrm_nl, resp_skb,
1290 NETLINK_CB(skb).pid);
1291 }
1292 } else {
1293 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1294 AUDIT_MAC_IPSEC_DELSPD, err ? 0 : 1, xp, NULL);
1295
1296 if (err != 0)
1297 goto out;
1298
1299 c.data.byid = p->index;
1300 c.event = nlh->nlmsg_type;
1301 c.seq = nlh->nlmsg_seq;
1302 c.pid = nlh->nlmsg_pid;
1303 km_policy_notify(xp, p->dir, &c);
1304 }
1305
1306 out:
1307 xfrm_pol_put(xp);
1308 return err;
1309 }
1310
1311 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1312 struct nlattr **attrs)
1313 {
1314 struct km_event c;
1315 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1316 struct xfrm_audit audit_info;
1317 int err;
1318
1319 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1320 audit_info.secid = NETLINK_CB(skb).sid;
1321 err = xfrm_state_flush(p->proto, &audit_info);
1322 if (err)
1323 return err;
1324 c.data.proto = p->proto;
1325 c.event = nlh->nlmsg_type;
1326 c.seq = nlh->nlmsg_seq;
1327 c.pid = nlh->nlmsg_pid;
1328 km_state_notify(NULL, &c);
1329
1330 return 0;
1331 }
1332
1333 static inline size_t xfrm_aevent_msgsize(void)
1334 {
1335 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1336 + nla_total_size(sizeof(struct xfrm_replay_state))
1337 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1338 + nla_total_size(4) /* XFRM_AE_RTHR */
1339 + nla_total_size(4); /* XFRM_AE_ETHR */
1340 }
1341
1342 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1343 {
1344 struct xfrm_aevent_id *id;
1345 struct nlmsghdr *nlh;
1346
1347 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1348 if (nlh == NULL)
1349 return -EMSGSIZE;
1350
1351 id = nlmsg_data(nlh);
1352 memcpy(&id->sa_id.daddr, &x->id.daddr,sizeof(x->id.daddr));
1353 id->sa_id.spi = x->id.spi;
1354 id->sa_id.family = x->props.family;
1355 id->sa_id.proto = x->id.proto;
1356 memcpy(&id->saddr, &x->props.saddr,sizeof(x->props.saddr));
1357 id->reqid = x->props.reqid;
1358 id->flags = c->data.aevent;
1359
1360 NLA_PUT(skb, XFRMA_REPLAY_VAL, sizeof(x->replay), &x->replay);
1361 NLA_PUT(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1362
1363 if (id->flags & XFRM_AE_RTHR)
1364 NLA_PUT_U32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1365
1366 if (id->flags & XFRM_AE_ETHR)
1367 NLA_PUT_U32(skb, XFRMA_ETIMER_THRESH,
1368 x->replay_maxage * 10 / HZ);
1369
1370 return nlmsg_end(skb, nlh);
1371
1372 nla_put_failure:
1373 nlmsg_cancel(skb, nlh);
1374 return -EMSGSIZE;
1375 }
1376
1377 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1378 struct nlattr **attrs)
1379 {
1380 struct xfrm_state *x;
1381 struct sk_buff *r_skb;
1382 int err;
1383 struct km_event c;
1384 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1385 struct xfrm_usersa_id *id = &p->sa_id;
1386
1387 r_skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1388 if (r_skb == NULL)
1389 return -ENOMEM;
1390
1391 x = xfrm_state_lookup(&id->daddr, id->spi, id->proto, id->family);
1392 if (x == NULL) {
1393 kfree_skb(r_skb);
1394 return -ESRCH;
1395 }
1396
1397 /*
1398 * XXX: is this lock really needed - none of the other
1399 * gets lock (the concern is things getting updated
1400 * while we are still reading) - jhs
1401 */
1402 spin_lock_bh(&x->lock);
1403 c.data.aevent = p->flags;
1404 c.seq = nlh->nlmsg_seq;
1405 c.pid = nlh->nlmsg_pid;
1406
1407 if (build_aevent(r_skb, x, &c) < 0)
1408 BUG();
1409 err = nlmsg_unicast(xfrm_nl, r_skb, NETLINK_CB(skb).pid);
1410 spin_unlock_bh(&x->lock);
1411 xfrm_state_put(x);
1412 return err;
1413 }
1414
1415 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1416 struct nlattr **attrs)
1417 {
1418 struct xfrm_state *x;
1419 struct km_event c;
1420 int err = - EINVAL;
1421 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1422 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1423 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1424
1425 if (!lt && !rp)
1426 return err;
1427
1428 /* pedantic mode - thou shalt sayeth replaceth */
1429 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1430 return err;
1431
1432 x = xfrm_state_lookup(&p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1433 if (x == NULL)
1434 return -ESRCH;
1435
1436 if (x->km.state != XFRM_STATE_VALID)
1437 goto out;
1438
1439 spin_lock_bh(&x->lock);
1440 xfrm_update_ae_params(x, attrs);
1441 spin_unlock_bh(&x->lock);
1442
1443 c.event = nlh->nlmsg_type;
1444 c.seq = nlh->nlmsg_seq;
1445 c.pid = nlh->nlmsg_pid;
1446 c.data.aevent = XFRM_AE_CU;
1447 km_state_notify(x, &c);
1448 err = 0;
1449 out:
1450 xfrm_state_put(x);
1451 return err;
1452 }
1453
1454 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1455 struct nlattr **attrs)
1456 {
1457 struct km_event c;
1458 u8 type = XFRM_POLICY_TYPE_MAIN;
1459 int err;
1460 struct xfrm_audit audit_info;
1461
1462 err = copy_from_user_policy_type(&type, attrs);
1463 if (err)
1464 return err;
1465
1466 audit_info.loginuid = NETLINK_CB(skb).loginuid;
1467 audit_info.secid = NETLINK_CB(skb).sid;
1468 err = xfrm_policy_flush(type, &audit_info);
1469 if (err)
1470 return err;
1471 c.data.type = type;
1472 c.event = nlh->nlmsg_type;
1473 c.seq = nlh->nlmsg_seq;
1474 c.pid = nlh->nlmsg_pid;
1475 km_policy_notify(NULL, 0, &c);
1476 return 0;
1477 }
1478
1479 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1480 struct nlattr **attrs)
1481 {
1482 struct xfrm_policy *xp;
1483 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
1484 struct xfrm_userpolicy_info *p = &up->pol;
1485 u8 type = XFRM_POLICY_TYPE_MAIN;
1486 int err = -ENOENT;
1487
1488 err = copy_from_user_policy_type(&type, attrs);
1489 if (err)
1490 return err;
1491
1492 if (p->index)
1493 xp = xfrm_policy_byid(type, p->dir, p->index, 0, &err);
1494 else {
1495 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1496 struct xfrm_policy tmp;
1497
1498 err = verify_sec_ctx_len(attrs);
1499 if (err)
1500 return err;
1501
1502 memset(&tmp, 0, sizeof(struct xfrm_policy));
1503 if (rt) {
1504 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1505
1506 if ((err = security_xfrm_policy_alloc(&tmp, uctx)))
1507 return err;
1508 }
1509 xp = xfrm_policy_bysel_ctx(type, p->dir, &p->sel, tmp.security,
1510 0, &err);
1511 security_xfrm_policy_free(&tmp);
1512 }
1513
1514 if (xp == NULL)
1515 return -ENOENT;
1516 read_lock(&xp->lock);
1517 if (xp->dead) {
1518 read_unlock(&xp->lock);
1519 goto out;
1520 }
1521
1522 read_unlock(&xp->lock);
1523 err = 0;
1524 if (up->hard) {
1525 xfrm_policy_delete(xp, p->dir);
1526 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1527 AUDIT_MAC_IPSEC_DELSPD, 1, xp, NULL);
1528
1529 } else {
1530 // reset the timers here?
1531 printk("Dont know what to do with soft policy expire\n");
1532 }
1533 km_policy_expired(xp, p->dir, up->hard, current->pid);
1534
1535 out:
1536 xfrm_pol_put(xp);
1537 return err;
1538 }
1539
1540 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1541 struct nlattr **attrs)
1542 {
1543 struct xfrm_state *x;
1544 int err;
1545 struct xfrm_user_expire *ue = nlmsg_data(nlh);
1546 struct xfrm_usersa_info *p = &ue->state;
1547
1548 x = xfrm_state_lookup(&p->id.daddr, p->id.spi, p->id.proto, p->family);
1549
1550 err = -ENOENT;
1551 if (x == NULL)
1552 return err;
1553
1554 spin_lock_bh(&x->lock);
1555 err = -EINVAL;
1556 if (x->km.state != XFRM_STATE_VALID)
1557 goto out;
1558 km_state_expired(x, ue->hard, current->pid);
1559
1560 if (ue->hard) {
1561 __xfrm_state_delete(x);
1562 xfrm_audit_log(NETLINK_CB(skb).loginuid, NETLINK_CB(skb).sid,
1563 AUDIT_MAC_IPSEC_DELSA, 1, NULL, x);
1564 }
1565 err = 0;
1566 out:
1567 spin_unlock_bh(&x->lock);
1568 xfrm_state_put(x);
1569 return err;
1570 }
1571
1572 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
1573 struct nlattr **attrs)
1574 {
1575 struct xfrm_policy *xp;
1576 struct xfrm_user_tmpl *ut;
1577 int i;
1578 struct nlattr *rt = attrs[XFRMA_TMPL];
1579
1580 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
1581 struct xfrm_state *x = xfrm_state_alloc();
1582 int err = -ENOMEM;
1583
1584 if (!x)
1585 return err;
1586
1587 err = verify_newpolicy_info(&ua->policy);
1588 if (err) {
1589 printk("BAD policy passed\n");
1590 kfree(x);
1591 return err;
1592 }
1593
1594 /* build an XP */
1595 xp = xfrm_policy_construct(&ua->policy, attrs, &err);
1596 if (!xp) {
1597 kfree(x);
1598 return err;
1599 }
1600
1601 memcpy(&x->id, &ua->id, sizeof(ua->id));
1602 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
1603 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
1604
1605 ut = nla_data(rt);
1606 /* extract the templates and for each call km_key */
1607 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
1608 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1609 memcpy(&x->id, &t->id, sizeof(x->id));
1610 x->props.mode = t->mode;
1611 x->props.reqid = t->reqid;
1612 x->props.family = ut->family;
1613 t->aalgos = ua->aalgos;
1614 t->ealgos = ua->ealgos;
1615 t->calgos = ua->calgos;
1616 err = km_query(x, t, xp);
1617
1618 }
1619
1620 kfree(x);
1621 kfree(xp);
1622
1623 return 0;
1624 }
1625
1626 #ifdef CONFIG_XFRM_MIGRATE
1627 static int copy_from_user_migrate(struct xfrm_migrate *ma,
1628 struct nlattr **attrs, int *num)
1629 {
1630 struct nlattr *rt = attrs[XFRMA_MIGRATE];
1631 struct xfrm_user_migrate *um;
1632 int i, num_migrate;
1633
1634 um = nla_data(rt);
1635 num_migrate = nla_len(rt) / sizeof(*um);
1636
1637 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
1638 return -EINVAL;
1639
1640 for (i = 0; i < num_migrate; i++, um++, ma++) {
1641 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
1642 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
1643 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
1644 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
1645
1646 ma->proto = um->proto;
1647 ma->mode = um->mode;
1648 ma->reqid = um->reqid;
1649
1650 ma->old_family = um->old_family;
1651 ma->new_family = um->new_family;
1652 }
1653
1654 *num = i;
1655 return 0;
1656 }
1657
1658 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1659 struct nlattr **attrs)
1660 {
1661 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
1662 struct xfrm_migrate m[XFRM_MAX_DEPTH];
1663 u8 type;
1664 int err;
1665 int n = 0;
1666
1667 if (attrs[XFRMA_MIGRATE] == NULL)
1668 return -EINVAL;
1669
1670 err = copy_from_user_policy_type(&type, attrs);
1671 if (err)
1672 return err;
1673
1674 err = copy_from_user_migrate((struct xfrm_migrate *)m,
1675 attrs, &n);
1676 if (err)
1677 return err;
1678
1679 if (!n)
1680 return 0;
1681
1682 xfrm_migrate(&pi->sel, pi->dir, type, m, n);
1683
1684 return 0;
1685 }
1686 #else
1687 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
1688 struct nlattr **attrs)
1689 {
1690 return -ENOPROTOOPT;
1691 }
1692 #endif
1693
1694 #ifdef CONFIG_XFRM_MIGRATE
1695 static int copy_to_user_migrate(struct xfrm_migrate *m, struct sk_buff *skb)
1696 {
1697 struct xfrm_user_migrate um;
1698
1699 memset(&um, 0, sizeof(um));
1700 um.proto = m->proto;
1701 um.mode = m->mode;
1702 um.reqid = m->reqid;
1703 um.old_family = m->old_family;
1704 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
1705 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
1706 um.new_family = m->new_family;
1707 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
1708 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
1709
1710 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
1711 }
1712
1713 static inline size_t xfrm_migrate_msgsize(int num_migrate)
1714 {
1715 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
1716 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
1717 + userpolicy_type_attrsize();
1718 }
1719
1720 static int build_migrate(struct sk_buff *skb, struct xfrm_migrate *m,
1721 int num_migrate, struct xfrm_selector *sel,
1722 u8 dir, u8 type)
1723 {
1724 struct xfrm_migrate *mp;
1725 struct xfrm_userpolicy_id *pol_id;
1726 struct nlmsghdr *nlh;
1727 int i;
1728
1729 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
1730 if (nlh == NULL)
1731 return -EMSGSIZE;
1732
1733 pol_id = nlmsg_data(nlh);
1734 /* copy data from selector, dir, and type to the pol_id */
1735 memset(pol_id, 0, sizeof(*pol_id));
1736 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
1737 pol_id->dir = dir;
1738
1739 if (copy_to_user_policy_type(type, skb) < 0)
1740 goto nlmsg_failure;
1741
1742 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
1743 if (copy_to_user_migrate(mp, skb) < 0)
1744 goto nlmsg_failure;
1745 }
1746
1747 return nlmsg_end(skb, nlh);
1748 nlmsg_failure:
1749 nlmsg_cancel(skb, nlh);
1750 return -EMSGSIZE;
1751 }
1752
1753 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1754 struct xfrm_migrate *m, int num_migrate)
1755 {
1756 struct sk_buff *skb;
1757
1758 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate), GFP_ATOMIC);
1759 if (skb == NULL)
1760 return -ENOMEM;
1761
1762 /* build migrate */
1763 if (build_migrate(skb, m, num_migrate, sel, dir, type) < 0)
1764 BUG();
1765
1766 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_MIGRATE, GFP_ATOMIC);
1767 }
1768 #else
1769 static int xfrm_send_migrate(struct xfrm_selector *sel, u8 dir, u8 type,
1770 struct xfrm_migrate *m, int num_migrate)
1771 {
1772 return -ENOPROTOOPT;
1773 }
1774 #endif
1775
1776 #define XMSGSIZE(type) sizeof(struct type)
1777
1778 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
1779 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1780 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1781 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
1782 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1783 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1784 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1785 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
1786 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
1787 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
1788 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
1789 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
1790 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
1791 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
1792 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
1793 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1794 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
1795 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
1796 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
1797 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
1798 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
1799 };
1800
1801 #undef XMSGSIZE
1802
1803 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
1804 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
1805 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
1806 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
1807 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
1808 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
1809 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
1810 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
1811 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
1812 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
1813 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
1814 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
1815 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
1816 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
1817 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
1818 };
1819
1820 static struct xfrm_link {
1821 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
1822 int (*dump)(struct sk_buff *, struct netlink_callback *);
1823 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
1824 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1825 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
1826 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
1827 .dump = xfrm_dump_sa },
1828 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1829 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
1830 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
1831 .dump = xfrm_dump_policy },
1832 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
1833 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
1834 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
1835 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
1836 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
1837 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
1838 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
1839 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
1840 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
1841 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
1842 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
1843 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
1844 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
1845 };
1846
1847 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
1848 {
1849 struct nlattr *attrs[XFRMA_MAX+1];
1850 struct xfrm_link *link;
1851 int type, err;
1852
1853 type = nlh->nlmsg_type;
1854 if (type > XFRM_MSG_MAX)
1855 return -EINVAL;
1856
1857 type -= XFRM_MSG_BASE;
1858 link = &xfrm_dispatch[type];
1859
1860 /* All operations require privileges, even GET */
1861 if (security_netlink_recv(skb, CAP_NET_ADMIN))
1862 return -EPERM;
1863
1864 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
1865 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
1866 (nlh->nlmsg_flags & NLM_F_DUMP)) {
1867 if (link->dump == NULL)
1868 return -EINVAL;
1869
1870 return netlink_dump_start(xfrm_nl, skb, nlh, link->dump, NULL);
1871 }
1872
1873 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs, XFRMA_MAX,
1874 xfrma_policy);
1875 if (err < 0)
1876 return err;
1877
1878 if (link->doit == NULL)
1879 return -EINVAL;
1880
1881 return link->doit(skb, nlh, attrs);
1882 }
1883
1884 static void xfrm_netlink_rcv(struct sock *sk, int len)
1885 {
1886 unsigned int qlen = 0;
1887
1888 do {
1889 mutex_lock(&xfrm_cfg_mutex);
1890 netlink_run_queue(sk, &qlen, &xfrm_user_rcv_msg);
1891 mutex_unlock(&xfrm_cfg_mutex);
1892
1893 } while (qlen);
1894 }
1895
1896 static inline size_t xfrm_expire_msgsize(void)
1897 {
1898 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire));
1899 }
1900
1901 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, struct km_event *c)
1902 {
1903 struct xfrm_user_expire *ue;
1904 struct nlmsghdr *nlh;
1905
1906 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
1907 if (nlh == NULL)
1908 return -EMSGSIZE;
1909
1910 ue = nlmsg_data(nlh);
1911 copy_to_user_state(x, &ue->state);
1912 ue->hard = (c->data.hard != 0) ? 1 : 0;
1913
1914 return nlmsg_end(skb, nlh);
1915 }
1916
1917 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1918 {
1919 struct sk_buff *skb;
1920
1921 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
1922 if (skb == NULL)
1923 return -ENOMEM;
1924
1925 if (build_expire(skb, x, c) < 0)
1926 BUG();
1927
1928 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
1929 }
1930
1931 static int xfrm_aevent_state_notify(struct xfrm_state *x, struct km_event *c)
1932 {
1933 struct sk_buff *skb;
1934
1935 skb = nlmsg_new(xfrm_aevent_msgsize(), GFP_ATOMIC);
1936 if (skb == NULL)
1937 return -ENOMEM;
1938
1939 if (build_aevent(skb, x, c) < 0)
1940 BUG();
1941
1942 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_AEVENTS, GFP_ATOMIC);
1943 }
1944
1945 static int xfrm_notify_sa_flush(struct km_event *c)
1946 {
1947 struct xfrm_usersa_flush *p;
1948 struct nlmsghdr *nlh;
1949 struct sk_buff *skb;
1950 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
1951
1952 skb = nlmsg_new(len, GFP_ATOMIC);
1953 if (skb == NULL)
1954 return -ENOMEM;
1955
1956 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
1957 if (nlh == NULL) {
1958 kfree_skb(skb);
1959 return -EMSGSIZE;
1960 }
1961
1962 p = nlmsg_data(nlh);
1963 p->proto = c->data.proto;
1964
1965 nlmsg_end(skb, nlh);
1966
1967 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
1968 }
1969
1970 static inline size_t xfrm_sa_len(struct xfrm_state *x)
1971 {
1972 size_t l = 0;
1973 if (x->aalg)
1974 l += nla_total_size(alg_len(x->aalg));
1975 if (x->ealg)
1976 l += nla_total_size(alg_len(x->ealg));
1977 if (x->calg)
1978 l += nla_total_size(sizeof(*x->calg));
1979 if (x->encap)
1980 l += nla_total_size(sizeof(*x->encap));
1981
1982 return l;
1983 }
1984
1985 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1986 {
1987 struct xfrm_usersa_info *p;
1988 struct xfrm_usersa_id *id;
1989 struct nlmsghdr *nlh;
1990 struct sk_buff *skb;
1991 int len = xfrm_sa_len(x);
1992 int headlen;
1993
1994 headlen = sizeof(*p);
1995 if (c->event == XFRM_MSG_DELSA) {
1996 len += nla_total_size(headlen);
1997 headlen = sizeof(*id);
1998 }
1999 len += NLMSG_ALIGN(headlen);
2000
2001 skb = nlmsg_new(len, GFP_ATOMIC);
2002 if (skb == NULL)
2003 return -ENOMEM;
2004
2005 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2006 if (nlh == NULL)
2007 goto nla_put_failure;
2008
2009 p = nlmsg_data(nlh);
2010 if (c->event == XFRM_MSG_DELSA) {
2011 struct nlattr *attr;
2012
2013 id = nlmsg_data(nlh);
2014 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2015 id->spi = x->id.spi;
2016 id->family = x->props.family;
2017 id->proto = x->id.proto;
2018
2019 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2020 if (attr == NULL)
2021 goto nla_put_failure;
2022
2023 p = nla_data(attr);
2024 }
2025
2026 copy_to_user_state(x, p);
2027
2028 if (x->aalg)
2029 NLA_PUT(skb, XFRMA_ALG_AUTH, alg_len(x->aalg), x->aalg);
2030 if (x->ealg)
2031 NLA_PUT(skb, XFRMA_ALG_CRYPT, alg_len(x->ealg), x->ealg);
2032 if (x->calg)
2033 NLA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
2034
2035 if (x->encap)
2036 NLA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
2037
2038 nlmsg_end(skb, nlh);
2039
2040 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_SA, GFP_ATOMIC);
2041
2042 nla_put_failure:
2043 kfree_skb(skb);
2044 return -1;
2045 }
2046
2047 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
2048 {
2049
2050 switch (c->event) {
2051 case XFRM_MSG_EXPIRE:
2052 return xfrm_exp_state_notify(x, c);
2053 case XFRM_MSG_NEWAE:
2054 return xfrm_aevent_state_notify(x, c);
2055 case XFRM_MSG_DELSA:
2056 case XFRM_MSG_UPDSA:
2057 case XFRM_MSG_NEWSA:
2058 return xfrm_notify_sa(x, c);
2059 case XFRM_MSG_FLUSHSA:
2060 return xfrm_notify_sa_flush(c);
2061 default:
2062 printk("xfrm_user: Unknown SA event %d\n", c->event);
2063 break;
2064 }
2065
2066 return 0;
2067
2068 }
2069
2070 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2071 struct xfrm_policy *xp)
2072 {
2073 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2074 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2075 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2076 + userpolicy_type_attrsize();
2077 }
2078
2079 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2080 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
2081 int dir)
2082 {
2083 struct xfrm_user_acquire *ua;
2084 struct nlmsghdr *nlh;
2085 __u32 seq = xfrm_get_acqseq();
2086
2087 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2088 if (nlh == NULL)
2089 return -EMSGSIZE;
2090
2091 ua = nlmsg_data(nlh);
2092 memcpy(&ua->id, &x->id, sizeof(ua->id));
2093 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2094 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2095 copy_to_user_policy(xp, &ua->policy, dir);
2096 ua->aalgos = xt->aalgos;
2097 ua->ealgos = xt->ealgos;
2098 ua->calgos = xt->calgos;
2099 ua->seq = x->km.seq = seq;
2100
2101 if (copy_to_user_tmpl(xp, skb) < 0)
2102 goto nlmsg_failure;
2103 if (copy_to_user_state_sec_ctx(x, skb))
2104 goto nlmsg_failure;
2105 if (copy_to_user_policy_type(xp->type, skb) < 0)
2106 goto nlmsg_failure;
2107
2108 return nlmsg_end(skb, nlh);
2109
2110 nlmsg_failure:
2111 nlmsg_cancel(skb, nlh);
2112 return -EMSGSIZE;
2113 }
2114
2115 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2116 struct xfrm_policy *xp, int dir)
2117 {
2118 struct sk_buff *skb;
2119
2120 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2121 if (skb == NULL)
2122 return -ENOMEM;
2123
2124 if (build_acquire(skb, x, xt, xp, dir) < 0)
2125 BUG();
2126
2127 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_ACQUIRE, GFP_ATOMIC);
2128 }
2129
2130 /* User gives us xfrm_user_policy_info followed by an array of 0
2131 * or more templates.
2132 */
2133 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2134 u8 *data, int len, int *dir)
2135 {
2136 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2137 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2138 struct xfrm_policy *xp;
2139 int nr;
2140
2141 switch (sk->sk_family) {
2142 case AF_INET:
2143 if (opt != IP_XFRM_POLICY) {
2144 *dir = -EOPNOTSUPP;
2145 return NULL;
2146 }
2147 break;
2148 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
2149 case AF_INET6:
2150 if (opt != IPV6_XFRM_POLICY) {
2151 *dir = -EOPNOTSUPP;
2152 return NULL;
2153 }
2154 break;
2155 #endif
2156 default:
2157 *dir = -EINVAL;
2158 return NULL;
2159 }
2160
2161 *dir = -EINVAL;
2162
2163 if (len < sizeof(*p) ||
2164 verify_newpolicy_info(p))
2165 return NULL;
2166
2167 nr = ((len - sizeof(*p)) / sizeof(*ut));
2168 if (validate_tmpl(nr, ut, p->sel.family))
2169 return NULL;
2170
2171 if (p->dir > XFRM_POLICY_OUT)
2172 return NULL;
2173
2174 xp = xfrm_policy_alloc(GFP_KERNEL);
2175 if (xp == NULL) {
2176 *dir = -ENOBUFS;
2177 return NULL;
2178 }
2179
2180 copy_from_user_policy(xp, p);
2181 xp->type = XFRM_POLICY_TYPE_MAIN;
2182 copy_templates(xp, ut, nr);
2183
2184 *dir = p->dir;
2185
2186 return xp;
2187 }
2188
2189 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2190 {
2191 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2192 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2193 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2194 + userpolicy_type_attrsize();
2195 }
2196
2197 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2198 int dir, struct km_event *c)
2199 {
2200 struct xfrm_user_polexpire *upe;
2201 struct nlmsghdr *nlh;
2202 int hard = c->data.hard;
2203
2204 nlh = nlmsg_put(skb, c->pid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2205 if (nlh == NULL)
2206 return -EMSGSIZE;
2207
2208 upe = nlmsg_data(nlh);
2209 copy_to_user_policy(xp, &upe->pol, dir);
2210 if (copy_to_user_tmpl(xp, skb) < 0)
2211 goto nlmsg_failure;
2212 if (copy_to_user_sec_ctx(xp, skb))
2213 goto nlmsg_failure;
2214 if (copy_to_user_policy_type(xp->type, skb) < 0)
2215 goto nlmsg_failure;
2216 upe->hard = !!hard;
2217
2218 return nlmsg_end(skb, nlh);
2219
2220 nlmsg_failure:
2221 nlmsg_cancel(skb, nlh);
2222 return -EMSGSIZE;
2223 }
2224
2225 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2226 {
2227 struct sk_buff *skb;
2228
2229 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2230 if (skb == NULL)
2231 return -ENOMEM;
2232
2233 if (build_polexpire(skb, xp, dir, c) < 0)
2234 BUG();
2235
2236 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_EXPIRE, GFP_ATOMIC);
2237 }
2238
2239 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
2240 {
2241 struct xfrm_userpolicy_info *p;
2242 struct xfrm_userpolicy_id *id;
2243 struct nlmsghdr *nlh;
2244 struct sk_buff *skb;
2245 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2246 int headlen;
2247
2248 headlen = sizeof(*p);
2249 if (c->event == XFRM_MSG_DELPOLICY) {
2250 len += nla_total_size(headlen);
2251 headlen = sizeof(*id);
2252 }
2253 len += userpolicy_type_attrsize();
2254 len += NLMSG_ALIGN(headlen);
2255
2256 skb = nlmsg_new(len, GFP_ATOMIC);
2257 if (skb == NULL)
2258 return -ENOMEM;
2259
2260 nlh = nlmsg_put(skb, c->pid, c->seq, c->event, headlen, 0);
2261 if (nlh == NULL)
2262 goto nlmsg_failure;
2263
2264 p = nlmsg_data(nlh);
2265 if (c->event == XFRM_MSG_DELPOLICY) {
2266 struct nlattr *attr;
2267
2268 id = nlmsg_data(nlh);
2269 memset(id, 0, sizeof(*id));
2270 id->dir = dir;
2271 if (c->data.byid)
2272 id->index = xp->index;
2273 else
2274 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2275
2276 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2277 if (attr == NULL)
2278 goto nlmsg_failure;
2279
2280 p = nla_data(attr);
2281 }
2282
2283 copy_to_user_policy(xp, p, dir);
2284 if (copy_to_user_tmpl(xp, skb) < 0)
2285 goto nlmsg_failure;
2286 if (copy_to_user_policy_type(xp->type, skb) < 0)
2287 goto nlmsg_failure;
2288
2289 nlmsg_end(skb, nlh);
2290
2291 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2292
2293 nlmsg_failure:
2294 kfree_skb(skb);
2295 return -1;
2296 }
2297
2298 static int xfrm_notify_policy_flush(struct km_event *c)
2299 {
2300 struct nlmsghdr *nlh;
2301 struct sk_buff *skb;
2302
2303 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2304 if (skb == NULL)
2305 return -ENOMEM;
2306
2307 nlh = nlmsg_put(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2308 if (nlh == NULL)
2309 goto nlmsg_failure;
2310 if (copy_to_user_policy_type(c->data.type, skb) < 0)
2311 goto nlmsg_failure;
2312
2313 nlmsg_end(skb, nlh);
2314
2315 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_POLICY, GFP_ATOMIC);
2316
2317 nlmsg_failure:
2318 kfree_skb(skb);
2319 return -1;
2320 }
2321
2322 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
2323 {
2324
2325 switch (c->event) {
2326 case XFRM_MSG_NEWPOLICY:
2327 case XFRM_MSG_UPDPOLICY:
2328 case XFRM_MSG_DELPOLICY:
2329 return xfrm_notify_policy(xp, dir, c);
2330 case XFRM_MSG_FLUSHPOLICY:
2331 return xfrm_notify_policy_flush(c);
2332 case XFRM_MSG_POLEXPIRE:
2333 return xfrm_exp_policy_notify(xp, dir, c);
2334 default:
2335 printk("xfrm_user: Unknown Policy event %d\n", c->event);
2336 }
2337
2338 return 0;
2339
2340 }
2341
2342 static inline size_t xfrm_report_msgsize(void)
2343 {
2344 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
2345 }
2346
2347 static int build_report(struct sk_buff *skb, u8 proto,
2348 struct xfrm_selector *sel, xfrm_address_t *addr)
2349 {
2350 struct xfrm_user_report *ur;
2351 struct nlmsghdr *nlh;
2352
2353 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
2354 if (nlh == NULL)
2355 return -EMSGSIZE;
2356
2357 ur = nlmsg_data(nlh);
2358 ur->proto = proto;
2359 memcpy(&ur->sel, sel, sizeof(ur->sel));
2360
2361 if (addr)
2362 NLA_PUT(skb, XFRMA_COADDR, sizeof(*addr), addr);
2363
2364 return nlmsg_end(skb, nlh);
2365
2366 nla_put_failure:
2367 nlmsg_cancel(skb, nlh);
2368 return -EMSGSIZE;
2369 }
2370
2371 static int xfrm_send_report(u8 proto, struct xfrm_selector *sel,
2372 xfrm_address_t *addr)
2373 {
2374 struct sk_buff *skb;
2375
2376 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
2377 if (skb == NULL)
2378 return -ENOMEM;
2379
2380 if (build_report(skb, proto, sel, addr) < 0)
2381 BUG();
2382
2383 return nlmsg_multicast(xfrm_nl, skb, 0, XFRMNLGRP_REPORT, GFP_ATOMIC);
2384 }
2385
2386 static struct xfrm_mgr netlink_mgr = {
2387 .id = "netlink",
2388 .notify = xfrm_send_state_notify,
2389 .acquire = xfrm_send_acquire,
2390 .compile_policy = xfrm_compile_policy,
2391 .notify_policy = xfrm_send_policy_notify,
2392 .report = xfrm_send_report,
2393 .migrate = xfrm_send_migrate,
2394 };
2395
2396 static int __init xfrm_user_init(void)
2397 {
2398 struct sock *nlsk;
2399
2400 printk(KERN_INFO "Initializing XFRM netlink socket\n");
2401
2402 nlsk = netlink_kernel_create(NETLINK_XFRM, XFRMNLGRP_MAX,
2403 xfrm_netlink_rcv, NULL, THIS_MODULE);
2404 if (nlsk == NULL)
2405 return -ENOMEM;
2406 rcu_assign_pointer(xfrm_nl, nlsk);
2407
2408 xfrm_register_km(&netlink_mgr);
2409
2410 return 0;
2411 }
2412
2413 static void __exit xfrm_user_exit(void)
2414 {
2415 struct sock *nlsk = xfrm_nl;
2416
2417 xfrm_unregister_km(&netlink_mgr);
2418 rcu_assign_pointer(xfrm_nl, NULL);
2419 synchronize_rcu();
2420 sock_release(nlsk->sk_socket);
2421 }
2422
2423 module_init(xfrm_user_init);
2424 module_exit(xfrm_user_exit);
2425 MODULE_LICENSE("GPL");
2426 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);
2427
Verdex Pro support