1 /* xfrm_user.c: User interface to configure xfrm engine.
3 * Copyright (C) 2002 David S. Miller (davem@redhat.com)
7 * Kazunori MIYAZAWA @USAGI
8 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
13 #include <linux/module.h>
14 #include <linux/kernel.h>
15 #include <linux/types.h>
16 #include <linux/slab.h>
17 #include <linux/socket.h>
18 #include <linux/string.h>
19 #include <linux/net.h>
20 #include <linux/skbuff.h>
21 #include <linux/netlink.h>
22 #include <linux/rtnetlink.h>
23 #include <linux/pfkeyv2.h>
24 #include <linux/ipsec.h>
25 #include <linux/init.h>
26 #include <linux/security.h>
29 #include <asm/uaccess.h>
31 static struct sock *xfrm_nl;
33 static int verify_one_alg(struct rtattr **xfrma, enum xfrm_attr_type_t type)
35 struct rtattr *rt = xfrma[type - 1];
36 struct xfrm_algo *algp;
42 len = (rt->rta_len - sizeof(*rt)) - sizeof(*algp);
48 len -= (algp->alg_key_len + 7U) / 8;
54 if (!algp->alg_key_len &&
55 strcmp(algp->alg_name, "digest_null") != 0)
60 if (!algp->alg_key_len &&
61 strcmp(algp->alg_name, "cipher_null") != 0)
66 /* Zero length keys are legal. */
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
77 static int verify_encap_tmpl(struct rtattr **xfrma)
79 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
80 struct xfrm_encap_tmpl *encap;
85 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
91 static int verify_newsa_info(struct xfrm_usersa_info *p,
92 struct rtattr **xfrma)
102 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
114 switch (p->id.proto) {
116 if (!xfrma[XFRMA_ALG_AUTH-1] ||
117 xfrma[XFRMA_ALG_CRYPT-1] ||
118 xfrma[XFRMA_ALG_COMP-1])
123 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
124 !xfrma[XFRMA_ALG_CRYPT-1]) ||
125 xfrma[XFRMA_ALG_COMP-1])
130 if (!xfrma[XFRMA_ALG_COMP-1] ||
131 xfrma[XFRMA_ALG_AUTH-1] ||
132 xfrma[XFRMA_ALG_CRYPT-1])
140 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
142 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
144 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
146 if ((err = verify_encap_tmpl(xfrma)))
165 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
166 struct xfrm_algo_desc *(*get_byname)(char *, int),
167 struct rtattr *u_arg)
169 struct rtattr *rta = u_arg;
170 struct xfrm_algo *p, *ualg;
171 struct xfrm_algo_desc *algo;
177 ualg = RTA_DATA(rta);
179 algo = get_byname(ualg->alg_name, 1);
182 *props = algo->desc.sadb_alg_id;
184 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
185 p = kmalloc(len, GFP_KERNEL);
189 memcpy(p, ualg, len);
194 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
196 struct rtattr *rta = u_arg;
197 struct xfrm_encap_tmpl *p, *uencap;
202 uencap = RTA_DATA(rta);
203 p = kmalloc(sizeof(*p), GFP_KERNEL);
207 memcpy(p, uencap, sizeof(*p));
212 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
214 memcpy(&x->id, &p->id, sizeof(x->id));
215 memcpy(&x->sel, &p->sel, sizeof(x->sel));
216 memcpy(&x->lft, &p->lft, sizeof(x->lft));
217 x->props.mode = p->mode;
218 x->props.replay_window = p->replay_window;
219 x->props.reqid = p->reqid;
220 x->props.family = p->family;
221 x->props.saddr = p->saddr;
222 x->props.flags = p->flags;
225 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
226 struct rtattr **xfrma,
229 struct xfrm_state *x = xfrm_state_alloc();
235 copy_from_user_state(x, p);
237 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
238 xfrm_aalg_get_byname,
239 xfrma[XFRMA_ALG_AUTH-1])))
241 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
242 xfrm_ealg_get_byname,
243 xfrma[XFRMA_ALG_CRYPT-1])))
245 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
246 xfrm_calg_get_byname,
247 xfrma[XFRMA_ALG_COMP-1])))
249 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
253 x->type = xfrm_get_type(x->id.proto, x->props.family);
257 err = x->type->init_state(x, NULL);
261 x->curlft.add_time = (unsigned long) xtime.tv_sec;
262 x->km.state = XFRM_STATE_VALID;
268 x->km.state = XFRM_STATE_DEAD;
275 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
277 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
278 struct xfrm_state *x;
282 err = verify_newsa_info(p, (struct rtattr **) xfrma);
286 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
291 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
292 err = xfrm_state_add(x);
294 err = xfrm_state_update(x);
297 x->km.state = XFRM_STATE_DEAD;
302 c.seq = nlh->nlmsg_seq;
303 c.pid = nlh->nlmsg_pid;
304 c.event = nlh->nlmsg_type;
306 km_state_notify(x, &c);
312 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
314 struct xfrm_state *x;
317 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
319 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
323 if (xfrm_state_kern(x)) {
328 err = xfrm_state_delete(x);
334 c.seq = nlh->nlmsg_seq;
335 c.pid = nlh->nlmsg_pid;
336 c.event = nlh->nlmsg_type;
337 km_state_notify(x, &c);
343 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
345 memcpy(&p->id, &x->id, sizeof(p->id));
346 memcpy(&p->sel, &x->sel, sizeof(p->sel));
347 memcpy(&p->lft, &x->lft, sizeof(p->lft));
348 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
349 memcpy(&p->stats, &x->stats, sizeof(p->stats));
350 p->saddr = x->props.saddr;
351 p->mode = x->props.mode;
352 p->replay_window = x->props.replay_window;
353 p->reqid = x->props.reqid;
354 p->family = x->props.family;
355 p->flags = x->props.flags;
359 struct xfrm_dump_info {
360 struct sk_buff *in_skb;
361 struct sk_buff *out_skb;
368 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
370 struct xfrm_dump_info *sp = ptr;
371 struct sk_buff *in_skb = sp->in_skb;
372 struct sk_buff *skb = sp->out_skb;
373 struct xfrm_usersa_info *p;
374 struct nlmsghdr *nlh;
375 unsigned char *b = skb->tail;
377 if (sp->this_idx < sp->start_idx)
380 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
382 XFRM_MSG_NEWSA, sizeof(*p));
383 nlh->nlmsg_flags = sp->nlmsg_flags;
386 copy_to_user_state(x, p);
389 RTA_PUT(skb, XFRMA_ALG_AUTH,
390 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
392 RTA_PUT(skb, XFRMA_ALG_CRYPT,
393 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
395 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
398 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
400 nlh->nlmsg_len = skb->tail - b;
407 skb_trim(skb, b - skb->data);
411 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
413 struct xfrm_dump_info info;
415 info.in_skb = cb->skb;
417 info.nlmsg_seq = cb->nlh->nlmsg_seq;
418 info.nlmsg_flags = NLM_F_MULTI;
420 info.start_idx = cb->args[0];
421 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
422 cb->args[0] = info.this_idx;
427 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
428 struct xfrm_state *x, u32 seq)
430 struct xfrm_dump_info info;
433 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
435 return ERR_PTR(-ENOMEM);
437 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
438 info.in_skb = in_skb;
440 info.nlmsg_seq = seq;
441 info.nlmsg_flags = 0;
442 info.this_idx = info.start_idx = 0;
444 if (dump_one_state(x, 0, &info)) {
452 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
454 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
455 struct xfrm_state *x;
456 struct sk_buff *resp_skb;
459 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
464 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
465 if (IS_ERR(resp_skb)) {
466 err = PTR_ERR(resp_skb);
468 err = netlink_unicast(xfrm_nl, resp_skb,
469 NETLINK_CB(skb).pid, MSG_DONTWAIT);
476 static int verify_userspi_info(struct xfrm_userspi_info *p)
478 switch (p->info.id.proto) {
484 /* IPCOMP spi is 16-bits. */
485 if (p->max >= 0x10000)
499 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
501 struct xfrm_state *x;
502 struct xfrm_userspi_info *p;
503 struct sk_buff *resp_skb;
504 xfrm_address_t *daddr;
509 err = verify_userspi_info(p);
513 family = p->info.family;
514 daddr = &p->info.id.daddr;
518 x = xfrm_find_acq_byseq(p->info.seq);
519 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
526 x = xfrm_find_acq(p->info.mode, p->info.reqid,
527 p->info.id.proto, daddr,
534 resp_skb = ERR_PTR(-ENOENT);
536 spin_lock_bh(&x->lock);
537 if (x->km.state != XFRM_STATE_DEAD) {
538 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
540 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
542 spin_unlock_bh(&x->lock);
544 if (IS_ERR(resp_skb)) {
545 err = PTR_ERR(resp_skb);
549 err = netlink_unicast(xfrm_nl, resp_skb,
550 NETLINK_CB(skb).pid, MSG_DONTWAIT);
558 static int verify_policy_dir(__u8 dir)
562 case XFRM_POLICY_OUT:
563 case XFRM_POLICY_FWD:
573 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
577 case XFRM_SHARE_SESSION:
578 case XFRM_SHARE_USER:
579 case XFRM_SHARE_UNIQUE:
587 case XFRM_POLICY_ALLOW:
588 case XFRM_POLICY_BLOCK:
595 switch (p->sel.family) {
600 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
603 return -EAFNOSUPPORT;
610 return verify_policy_dir(p->dir);
613 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
619 for (i = 0; i < nr; i++, ut++) {
620 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
622 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
623 memcpy(&t->saddr, &ut->saddr,
624 sizeof(xfrm_address_t));
625 t->reqid = ut->reqid;
627 t->share = ut->share;
628 t->optional = ut->optional;
629 t->aalgos = ut->aalgos;
630 t->ealgos = ut->ealgos;
631 t->calgos = ut->calgos;
635 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
637 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
638 struct xfrm_user_tmpl *utmpl;
644 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
646 if (nr > XFRM_MAX_DEPTH)
649 copy_templates(pol, RTA_DATA(rt), nr);
654 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
656 xp->priority = p->priority;
657 xp->index = p->index;
658 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
659 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
660 xp->action = p->action;
661 xp->flags = p->flags;
662 xp->family = p->sel.family;
663 /* XXX xp->share = p->share; */
666 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
668 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
669 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
670 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
671 p->priority = xp->priority;
672 p->index = xp->index;
673 p->sel.family = xp->family;
675 p->action = xp->action;
676 p->flags = xp->flags;
677 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
680 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
682 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
690 copy_from_user_policy(xp, p);
691 err = copy_from_user_tmpl(xp, xfrma);
701 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
703 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
704 struct xfrm_policy *xp;
709 err = verify_newpolicy_info(p);
713 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
717 /* shouldnt excl be based on nlh flags??
718 * Aha! this is anti-netlink really i.e more pfkey derived
719 * in netlink excl is a flag and you wouldnt need
720 * a type XFRM_MSG_UPDPOLICY - JHS */
721 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
722 err = xfrm_policy_insert(p->dir, xp, excl);
728 c.event = nlh->nlmsg_type;
729 c.seq = nlh->nlmsg_seq;
730 c.pid = nlh->nlmsg_pid;
731 km_policy_notify(xp, p->dir, &c);
738 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
740 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
743 if (xp->xfrm_nr == 0)
746 for (i = 0; i < xp->xfrm_nr; i++) {
747 struct xfrm_user_tmpl *up = &vec[i];
748 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
750 memcpy(&up->id, &kp->id, sizeof(up->id));
751 up->family = xp->family;
752 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
753 up->reqid = kp->reqid;
755 up->share = kp->share;
756 up->optional = kp->optional;
757 up->aalgos = kp->aalgos;
758 up->ealgos = kp->ealgos;
759 up->calgos = kp->calgos;
761 RTA_PUT(skb, XFRMA_TMPL,
762 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
771 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
773 struct xfrm_dump_info *sp = ptr;
774 struct xfrm_userpolicy_info *p;
775 struct sk_buff *in_skb = sp->in_skb;
776 struct sk_buff *skb = sp->out_skb;
777 struct nlmsghdr *nlh;
778 unsigned char *b = skb->tail;
780 if (sp->this_idx < sp->start_idx)
783 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
785 XFRM_MSG_NEWPOLICY, sizeof(*p));
787 nlh->nlmsg_flags = sp->nlmsg_flags;
789 copy_to_user_policy(xp, p, dir);
790 if (copy_to_user_tmpl(xp, skb) < 0)
793 nlh->nlmsg_len = skb->tail - b;
799 skb_trim(skb, b - skb->data);
803 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
805 struct xfrm_dump_info info;
807 info.in_skb = cb->skb;
809 info.nlmsg_seq = cb->nlh->nlmsg_seq;
810 info.nlmsg_flags = NLM_F_MULTI;
812 info.start_idx = cb->args[0];
813 (void) xfrm_policy_walk(dump_one_policy, &info);
814 cb->args[0] = info.this_idx;
819 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
820 struct xfrm_policy *xp,
823 struct xfrm_dump_info info;
826 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
828 return ERR_PTR(-ENOMEM);
830 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
831 info.in_skb = in_skb;
833 info.nlmsg_seq = seq;
834 info.nlmsg_flags = 0;
835 info.this_idx = info.start_idx = 0;
837 if (dump_one_policy(xp, dir, 0, &info) < 0) {
845 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
847 struct xfrm_policy *xp;
848 struct xfrm_userpolicy_id *p;
854 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
856 err = verify_policy_dir(p->dir);
861 xp = xfrm_policy_byid(p->dir, p->index, delete);
863 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
868 struct sk_buff *resp_skb;
870 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
871 if (IS_ERR(resp_skb)) {
872 err = PTR_ERR(resp_skb);
874 err = netlink_unicast(xfrm_nl, resp_skb,
879 c.data.byid = p->index;
880 c.event = nlh->nlmsg_type;
881 c.seq = nlh->nlmsg_seq;
882 c.pid = nlh->nlmsg_pid;
883 km_policy_notify(xp, p->dir, &c);
891 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
894 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
896 xfrm_state_flush(p->proto);
897 c.data.proto = p->proto;
898 c.event = nlh->nlmsg_type;
899 c.seq = nlh->nlmsg_seq;
900 c.pid = nlh->nlmsg_pid;
901 km_state_notify(NULL, &c);
906 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
911 c.event = nlh->nlmsg_type;
912 c.seq = nlh->nlmsg_seq;
913 c.pid = nlh->nlmsg_pid;
914 km_policy_notify(NULL, 0, &c);
918 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
920 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
921 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
922 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
923 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
924 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
925 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
926 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
927 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
928 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
929 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
930 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
931 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
932 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
933 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
934 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
939 static struct xfrm_link {
940 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
941 int (*dump)(struct sk_buff *, struct netlink_callback *);
942 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
943 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
944 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
945 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
946 .dump = xfrm_dump_sa },
947 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
948 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
949 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
950 .dump = xfrm_dump_policy },
951 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
952 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
953 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
954 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
955 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
958 static int xfrm_done(struct netlink_callback *cb)
963 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
965 struct rtattr *xfrma[XFRMA_MAX];
966 struct xfrm_link *link;
969 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
972 type = nlh->nlmsg_type;
974 /* A control message: ignore them */
975 if (type < XFRM_MSG_BASE)
978 /* Unknown message: reply with EINVAL */
979 if (type > XFRM_MSG_MAX)
982 type -= XFRM_MSG_BASE;
983 link = &xfrm_dispatch[type];
985 /* All operations require privileges, even GET */
986 if (security_netlink_recv(skb)) {
991 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
992 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
993 (nlh->nlmsg_flags & NLM_F_DUMP)) {
996 if (link->dump == NULL)
999 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
1004 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1005 if (rlen > skb->len)
1007 skb_pull(skb, rlen);
1011 memset(xfrma, 0, sizeof(xfrma));
1013 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
1016 if (nlh->nlmsg_len > min_len) {
1017 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
1018 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
1020 while (RTA_OK(attr, attrlen)) {
1021 unsigned short flavor = attr->rta_type;
1023 if (flavor > XFRMA_MAX)
1025 xfrma[flavor - 1] = attr;
1027 attr = RTA_NEXT(attr, attrlen);
1031 if (link->doit == NULL)
1033 *errp = link->doit(skb, nlh, (void **) &xfrma);
1042 static int xfrm_user_rcv_skb(struct sk_buff *skb)
1045 struct nlmsghdr *nlh;
1047 while (skb->len >= NLMSG_SPACE(0)) {
1050 nlh = (struct nlmsghdr *) skb->data;
1051 if (nlh->nlmsg_len < sizeof(*nlh) ||
1052 skb->len < nlh->nlmsg_len)
1054 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
1055 if (rlen > skb->len)
1057 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1060 netlink_ack(skb, nlh, err);
1061 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1062 netlink_ack(skb, nlh, 0);
1063 skb_pull(skb, rlen);
1069 static void xfrm_netlink_rcv(struct sock *sk, int len)
1071 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1074 struct sk_buff *skb;
1076 down(&xfrm_cfg_sem);
1078 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1079 qlen = skb_queue_len(&sk->sk_receive_queue);
1081 for (; qlen; qlen--) {
1082 skb = skb_dequeue(&sk->sk_receive_queue);
1083 if (xfrm_user_rcv_skb(skb)) {
1085 skb_queue_head(&sk->sk_receive_queue,
1101 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1103 struct xfrm_user_expire *ue;
1104 struct nlmsghdr *nlh;
1105 unsigned char *b = skb->tail;
1107 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1109 ue = NLMSG_DATA(nlh);
1110 nlh->nlmsg_flags = 0;
1112 copy_to_user_state(x, &ue->state);
1113 ue->hard = (hard != 0) ? 1 : 0;
1115 nlh->nlmsg_len = skb->tail - b;
1119 skb_trim(skb, b - skb->data);
1123 static int xfrm_exp_state_notify(struct xfrm_state *x, struct km_event *c)
1125 struct sk_buff *skb;
1126 int len = NLMSG_LENGTH(sizeof(struct xfrm_user_expire));
1128 skb = alloc_skb(len, GFP_ATOMIC);
1132 if (build_expire(skb, x, c->data.hard) < 0)
1135 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1137 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1140 static int xfrm_notify_sa_flush(struct km_event *c)
1142 struct xfrm_usersa_flush *p;
1143 struct nlmsghdr *nlh;
1144 struct sk_buff *skb;
1146 int len = NLMSG_LENGTH(sizeof(struct xfrm_usersa_flush));
1148 skb = alloc_skb(len, GFP_ATOMIC);
1153 nlh = NLMSG_PUT(skb, c->pid, c->seq,
1154 XFRM_MSG_FLUSHSA, sizeof(*p));
1155 nlh->nlmsg_flags = 0;
1157 p = NLMSG_DATA(nlh);
1158 p->proto = c->data.proto;
1160 nlh->nlmsg_len = skb->tail - b;
1162 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1169 static int inline xfrm_sa_len(struct xfrm_state *x)
1173 l += RTA_SPACE(sizeof(*x->aalg) + (x->aalg->alg_key_len+7)/8);
1175 l += RTA_SPACE(sizeof(*x->ealg) + (x->ealg->alg_key_len+7)/8);
1177 l += RTA_SPACE(sizeof(*x->calg));
1179 l += RTA_SPACE(sizeof(*x->encap));
1184 static int xfrm_notify_sa(struct xfrm_state *x, struct km_event *c)
1186 struct xfrm_usersa_info *p;
1187 struct xfrm_usersa_id *id;
1188 struct nlmsghdr *nlh;
1189 struct sk_buff *skb;
1191 int len = xfrm_sa_len(x);
1194 headlen = sizeof(*p);
1195 if (c->event == XFRM_MSG_DELSA) {
1196 len += RTA_SPACE(headlen);
1197 headlen = sizeof(*id);
1199 len += NLMSG_SPACE(headlen);
1201 skb = alloc_skb(len, GFP_ATOMIC);
1206 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1207 nlh->nlmsg_flags = 0;
1209 p = NLMSG_DATA(nlh);
1210 if (c->event == XFRM_MSG_DELSA) {
1211 id = NLMSG_DATA(nlh);
1212 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
1213 id->spi = x->id.spi;
1214 id->family = x->props.family;
1215 id->proto = x->id.proto;
1217 p = RTA_DATA(__RTA_PUT(skb, XFRMA_SA, sizeof(*p)));
1220 copy_to_user_state(x, p);
1223 RTA_PUT(skb, XFRMA_ALG_AUTH,
1224 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
1226 RTA_PUT(skb, XFRMA_ALG_CRYPT,
1227 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
1229 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
1232 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
1234 nlh->nlmsg_len = skb->tail - b;
1236 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_SA, GFP_ATOMIC);
1244 static int xfrm_send_state_notify(struct xfrm_state *x, struct km_event *c)
1248 case XFRM_MSG_EXPIRE:
1249 return xfrm_exp_state_notify(x, c);
1250 case XFRM_MSG_DELSA:
1251 case XFRM_MSG_UPDSA:
1252 case XFRM_MSG_NEWSA:
1253 return xfrm_notify_sa(x, c);
1254 case XFRM_MSG_FLUSHSA:
1255 return xfrm_notify_sa_flush(c);
1257 printk("xfrm_user: Unknown SA event %d\n", c->event);
1265 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1266 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1269 struct xfrm_user_acquire *ua;
1270 struct nlmsghdr *nlh;
1271 unsigned char *b = skb->tail;
1272 __u32 seq = xfrm_get_acqseq();
1274 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1276 ua = NLMSG_DATA(nlh);
1277 nlh->nlmsg_flags = 0;
1279 memcpy(&ua->id, &x->id, sizeof(ua->id));
1280 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1281 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1282 copy_to_user_policy(xp, &ua->policy, dir);
1283 ua->aalgos = xt->aalgos;
1284 ua->ealgos = xt->ealgos;
1285 ua->calgos = xt->calgos;
1286 ua->seq = x->km.seq = seq;
1288 if (copy_to_user_tmpl(xp, skb) < 0)
1291 nlh->nlmsg_len = skb->tail - b;
1295 skb_trim(skb, b - skb->data);
1299 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1300 struct xfrm_policy *xp, int dir)
1302 struct sk_buff *skb;
1305 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1306 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1307 skb = alloc_skb(len, GFP_ATOMIC);
1311 if (build_acquire(skb, x, xt, xp, dir) < 0)
1314 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1316 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1319 /* User gives us xfrm_user_policy_info followed by an array of 0
1320 * or more templates.
1322 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1323 u8 *data, int len, int *dir)
1325 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1326 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1327 struct xfrm_policy *xp;
1332 if (opt != IP_XFRM_POLICY) {
1337 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1339 if (opt != IPV6_XFRM_POLICY) {
1352 if (len < sizeof(*p) ||
1353 verify_newpolicy_info(p))
1356 nr = ((len - sizeof(*p)) / sizeof(*ut));
1357 if (nr > XFRM_MAX_DEPTH)
1360 xp = xfrm_policy_alloc(GFP_KERNEL);
1366 copy_from_user_policy(xp, p);
1367 copy_templates(xp, ut, nr);
1374 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1377 struct xfrm_user_polexpire *upe;
1378 struct nlmsghdr *nlh;
1379 unsigned char *b = skb->tail;
1381 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1382 upe = NLMSG_DATA(nlh);
1383 nlh->nlmsg_flags = 0;
1385 copy_to_user_policy(xp, &upe->pol, dir);
1386 if (copy_to_user_tmpl(xp, skb) < 0)
1390 nlh->nlmsg_len = skb->tail - b;
1394 skb_trim(skb, b - skb->data);
1398 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1400 struct sk_buff *skb;
1403 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1404 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1405 skb = alloc_skb(len, GFP_ATOMIC);
1409 if (build_polexpire(skb, xp, dir, c->data.hard) < 0)
1412 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1414 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1417 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, struct km_event *c)
1419 struct xfrm_userpolicy_info *p;
1420 struct xfrm_userpolicy_id *id;
1421 struct nlmsghdr *nlh;
1422 struct sk_buff *skb;
1424 int len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1427 headlen = sizeof(*p);
1428 if (c->event == XFRM_MSG_DELPOLICY) {
1429 len += RTA_SPACE(headlen);
1430 headlen = sizeof(*id);
1432 len += NLMSG_SPACE(headlen);
1434 skb = alloc_skb(len, GFP_ATOMIC);
1439 nlh = NLMSG_PUT(skb, c->pid, c->seq, c->event, headlen);
1441 p = NLMSG_DATA(nlh);
1442 if (c->event == XFRM_MSG_DELPOLICY) {
1443 id = NLMSG_DATA(nlh);
1444 memset(id, 0, sizeof(*id));
1447 id->index = xp->index;
1449 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
1451 p = RTA_DATA(__RTA_PUT(skb, XFRMA_POLICY, sizeof(*p)));
1454 nlh->nlmsg_flags = 0;
1456 copy_to_user_policy(xp, p, dir);
1457 if (copy_to_user_tmpl(xp, skb) < 0)
1460 nlh->nlmsg_len = skb->tail - b;
1462 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1470 static int xfrm_notify_policy_flush(struct km_event *c)
1472 struct nlmsghdr *nlh;
1473 struct sk_buff *skb;
1475 int len = NLMSG_LENGTH(0);
1477 skb = alloc_skb(len, GFP_ATOMIC);
1483 nlh = NLMSG_PUT(skb, c->pid, c->seq, XFRM_MSG_FLUSHPOLICY, 0);
1485 nlh->nlmsg_len = skb->tail - b;
1487 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_POLICY, GFP_ATOMIC);
1494 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, struct km_event *c)
1498 case XFRM_MSG_NEWPOLICY:
1499 case XFRM_MSG_UPDPOLICY:
1500 case XFRM_MSG_DELPOLICY:
1501 return xfrm_notify_policy(xp, dir, c);
1502 case XFRM_MSG_FLUSHPOLICY:
1503 return xfrm_notify_policy_flush(c);
1504 case XFRM_MSG_POLEXPIRE:
1505 return xfrm_exp_policy_notify(xp, dir, c);
1507 printk("xfrm_user: Unknown Policy event %d\n", c->event);
1514 static struct xfrm_mgr netlink_mgr = {
1516 .notify = xfrm_send_state_notify,
1517 .acquire = xfrm_send_acquire,
1518 .compile_policy = xfrm_compile_policy,
1519 .notify_policy = xfrm_send_policy_notify,
1522 static int __init xfrm_user_init(void)
1524 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1526 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1527 if (xfrm_nl == NULL)
1530 xfrm_register_km(&netlink_mgr);
1535 static void __exit xfrm_user_exit(void)
1537 xfrm_unregister_km(&netlink_mgr);
1538 sock_release(xfrm_nl->sk_socket);
1541 module_init(xfrm_user_init);
1542 module_exit(xfrm_user_exit);
1543 MODULE_LICENSE("GPL");