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;
41 if ((rt->rta_len - sizeof(*rt)) < sizeof(*algp))
47 if (!algp->alg_key_len &&
48 strcmp(algp->alg_name, "digest_null") != 0)
53 if (!algp->alg_key_len &&
54 strcmp(algp->alg_name, "cipher_null") != 0)
59 /* Zero length keys are legal. */
66 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
70 static int verify_encap_tmpl(struct rtattr **xfrma)
72 struct rtattr *rt = xfrma[XFRMA_ENCAP - 1];
73 struct xfrm_encap_tmpl *encap;
78 if ((rt->rta_len - sizeof(*rt)) < sizeof(*encap))
84 static int verify_newsa_info(struct xfrm_usersa_info *p,
85 struct rtattr **xfrma)
95 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
107 switch (p->id.proto) {
109 if (!xfrma[XFRMA_ALG_AUTH-1] ||
110 xfrma[XFRMA_ALG_CRYPT-1] ||
111 xfrma[XFRMA_ALG_COMP-1])
116 if ((!xfrma[XFRMA_ALG_AUTH-1] &&
117 !xfrma[XFRMA_ALG_CRYPT-1]) ||
118 xfrma[XFRMA_ALG_COMP-1])
123 if (!xfrma[XFRMA_ALG_COMP-1] ||
124 xfrma[XFRMA_ALG_AUTH-1] ||
125 xfrma[XFRMA_ALG_CRYPT-1])
133 if ((err = verify_one_alg(xfrma, XFRMA_ALG_AUTH)))
135 if ((err = verify_one_alg(xfrma, XFRMA_ALG_CRYPT)))
137 if ((err = verify_one_alg(xfrma, XFRMA_ALG_COMP)))
139 if ((err = verify_encap_tmpl(xfrma)))
158 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
159 struct xfrm_algo_desc *(*get_byname)(char *, int),
160 struct rtattr *u_arg)
162 struct rtattr *rta = u_arg;
163 struct xfrm_algo *p, *ualg;
164 struct xfrm_algo_desc *algo;
170 ualg = RTA_DATA(rta);
172 algo = get_byname(ualg->alg_name, 1);
175 *props = algo->desc.sadb_alg_id;
177 len = sizeof(*ualg) + (ualg->alg_key_len + 7U) / 8;
178 p = kmalloc(len, GFP_KERNEL);
182 memcpy(p, ualg, len);
187 static int attach_encap_tmpl(struct xfrm_encap_tmpl **encapp, struct rtattr *u_arg)
189 struct rtattr *rta = u_arg;
190 struct xfrm_encap_tmpl *p, *uencap;
195 uencap = RTA_DATA(rta);
196 p = kmalloc(sizeof(*p), GFP_KERNEL);
200 memcpy(p, uencap, sizeof(*p));
205 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
207 memcpy(&x->id, &p->id, sizeof(x->id));
208 memcpy(&x->sel, &p->sel, sizeof(x->sel));
209 memcpy(&x->lft, &p->lft, sizeof(x->lft));
210 x->props.mode = p->mode;
211 x->props.replay_window = p->replay_window;
212 x->props.reqid = p->reqid;
213 x->props.family = p->family;
214 x->props.saddr = p->saddr;
215 x->props.flags = p->flags;
218 static struct xfrm_state *xfrm_state_construct(struct xfrm_usersa_info *p,
219 struct rtattr **xfrma,
222 struct xfrm_state *x = xfrm_state_alloc();
228 copy_from_user_state(x, p);
230 if ((err = attach_one_algo(&x->aalg, &x->props.aalgo,
231 xfrm_aalg_get_byname,
232 xfrma[XFRMA_ALG_AUTH-1])))
234 if ((err = attach_one_algo(&x->ealg, &x->props.ealgo,
235 xfrm_ealg_get_byname,
236 xfrma[XFRMA_ALG_CRYPT-1])))
238 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
239 xfrm_calg_get_byname,
240 xfrma[XFRMA_ALG_COMP-1])))
242 if ((err = attach_encap_tmpl(&x->encap, xfrma[XFRMA_ENCAP-1])))
246 x->type = xfrm_get_type(x->id.proto, x->props.family);
250 err = x->type->init_state(x, NULL);
254 x->curlft.add_time = (unsigned long) xtime.tv_sec;
255 x->km.state = XFRM_STATE_VALID;
261 x->km.state = XFRM_STATE_DEAD;
268 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
270 struct xfrm_usersa_info *p = NLMSG_DATA(nlh);
271 struct xfrm_state *x;
274 err = verify_newsa_info(p, (struct rtattr **) xfrma);
278 x = xfrm_state_construct(p, (struct rtattr **) xfrma, &err);
282 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
283 err = xfrm_state_add(x);
285 err = xfrm_state_update(x);
288 x->km.state = XFRM_STATE_DEAD;
295 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
297 struct xfrm_state *x;
298 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
300 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
304 if (xfrm_state_kern(x)) {
309 xfrm_state_delete(x);
315 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
317 memcpy(&p->id, &x->id, sizeof(p->id));
318 memcpy(&p->sel, &x->sel, sizeof(p->sel));
319 memcpy(&p->lft, &x->lft, sizeof(p->lft));
320 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
321 memcpy(&p->stats, &x->stats, sizeof(p->stats));
322 p->saddr = x->props.saddr;
323 p->mode = x->props.mode;
324 p->replay_window = x->props.replay_window;
325 p->reqid = x->props.reqid;
326 p->family = x->props.family;
327 p->flags = x->props.flags;
331 struct xfrm_dump_info {
332 struct sk_buff *in_skb;
333 struct sk_buff *out_skb;
340 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
342 struct xfrm_dump_info *sp = ptr;
343 struct sk_buff *in_skb = sp->in_skb;
344 struct sk_buff *skb = sp->out_skb;
345 struct xfrm_usersa_info *p;
346 struct nlmsghdr *nlh;
347 unsigned char *b = skb->tail;
349 if (sp->this_idx < sp->start_idx)
352 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
354 XFRM_MSG_NEWSA, sizeof(*p));
355 nlh->nlmsg_flags = sp->nlmsg_flags;
358 copy_to_user_state(x, p);
361 RTA_PUT(skb, XFRMA_ALG_AUTH,
362 sizeof(*(x->aalg))+(x->aalg->alg_key_len+7)/8, x->aalg);
364 RTA_PUT(skb, XFRMA_ALG_CRYPT,
365 sizeof(*(x->ealg))+(x->ealg->alg_key_len+7)/8, x->ealg);
367 RTA_PUT(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
370 RTA_PUT(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
372 nlh->nlmsg_len = skb->tail - b;
379 skb_trim(skb, b - skb->data);
383 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
385 struct xfrm_dump_info info;
387 info.in_skb = cb->skb;
389 info.nlmsg_seq = cb->nlh->nlmsg_seq;
390 info.nlmsg_flags = NLM_F_MULTI;
392 info.start_idx = cb->args[0];
393 (void) xfrm_state_walk(IPSEC_PROTO_ANY, dump_one_state, &info);
394 cb->args[0] = info.this_idx;
399 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
400 struct xfrm_state *x, u32 seq)
402 struct xfrm_dump_info info;
405 skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC);
407 return ERR_PTR(-ENOMEM);
409 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
410 info.in_skb = in_skb;
412 info.nlmsg_seq = seq;
413 info.nlmsg_flags = 0;
414 info.this_idx = info.start_idx = 0;
416 if (dump_one_state(x, 0, &info)) {
424 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
426 struct xfrm_usersa_id *p = NLMSG_DATA(nlh);
427 struct xfrm_state *x;
428 struct sk_buff *resp_skb;
431 x = xfrm_state_lookup(&p->daddr, p->spi, p->proto, p->family);
436 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
437 if (IS_ERR(resp_skb)) {
438 err = PTR_ERR(resp_skb);
440 err = netlink_unicast(xfrm_nl, resp_skb,
441 NETLINK_CB(skb).pid, MSG_DONTWAIT);
448 static int verify_userspi_info(struct xfrm_userspi_info *p)
450 switch (p->info.id.proto) {
456 /* IPCOMP spi is 16-bits. */
457 if (p->max >= 0x10000)
471 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
473 struct xfrm_state *x;
474 struct xfrm_userspi_info *p;
475 struct sk_buff *resp_skb;
476 xfrm_address_t *daddr;
481 err = verify_userspi_info(p);
485 family = p->info.family;
486 daddr = &p->info.id.daddr;
490 x = xfrm_find_acq_byseq(p->info.seq);
491 if (x && xfrm_addr_cmp(&x->id.daddr, daddr, family)) {
498 x = xfrm_find_acq(p->info.mode, p->info.reqid,
499 p->info.id.proto, daddr,
506 resp_skb = ERR_PTR(-ENOENT);
508 spin_lock_bh(&x->lock);
509 if (x->km.state != XFRM_STATE_DEAD) {
510 xfrm_alloc_spi(x, htonl(p->min), htonl(p->max));
512 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
514 spin_unlock_bh(&x->lock);
516 if (IS_ERR(resp_skb)) {
517 err = PTR_ERR(resp_skb);
521 err = netlink_unicast(xfrm_nl, resp_skb,
522 NETLINK_CB(skb).pid, MSG_DONTWAIT);
530 static int verify_policy_dir(__u8 dir)
534 case XFRM_POLICY_OUT:
535 case XFRM_POLICY_FWD:
545 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
549 case XFRM_SHARE_SESSION:
550 case XFRM_SHARE_USER:
551 case XFRM_SHARE_UNIQUE:
559 case XFRM_POLICY_ALLOW:
560 case XFRM_POLICY_BLOCK:
567 switch (p->sel.family) {
572 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
575 return -EAFNOSUPPORT;
582 return verify_policy_dir(p->dir);
585 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
591 for (i = 0; i < nr; i++, ut++) {
592 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
594 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
595 memcpy(&t->saddr, &ut->saddr,
596 sizeof(xfrm_address_t));
597 t->reqid = ut->reqid;
599 t->share = ut->share;
600 t->optional = ut->optional;
601 t->aalgos = ut->aalgos;
602 t->ealgos = ut->ealgos;
603 t->calgos = ut->calgos;
607 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct rtattr **xfrma)
609 struct rtattr *rt = xfrma[XFRMA_TMPL-1];
610 struct xfrm_user_tmpl *utmpl;
616 nr = (rt->rta_len - sizeof(*rt)) / sizeof(*utmpl);
618 if (nr > XFRM_MAX_DEPTH)
621 copy_templates(pol, RTA_DATA(rt), nr);
626 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
628 xp->priority = p->priority;
629 xp->index = p->index;
630 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
631 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
632 xp->action = p->action;
633 xp->flags = p->flags;
634 xp->family = p->sel.family;
635 /* XXX xp->share = p->share; */
638 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
640 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
641 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
642 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
643 p->priority = xp->priority;
644 p->index = xp->index;
645 p->sel.family = xp->family;
647 p->action = xp->action;
648 p->flags = xp->flags;
649 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
652 static struct xfrm_policy *xfrm_policy_construct(struct xfrm_userpolicy_info *p, struct rtattr **xfrma, int *errp)
654 struct xfrm_policy *xp = xfrm_policy_alloc(GFP_KERNEL);
662 copy_from_user_policy(xp, p);
663 err = copy_from_user_tmpl(xp, xfrma);
673 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
675 struct xfrm_userpolicy_info *p = NLMSG_DATA(nlh);
676 struct xfrm_policy *xp;
680 err = verify_newpolicy_info(p);
684 xp = xfrm_policy_construct(p, (struct rtattr **) xfrma, &err);
688 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
689 err = xfrm_policy_insert(p->dir, xp, excl);
700 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
702 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
705 if (xp->xfrm_nr == 0)
708 for (i = 0; i < xp->xfrm_nr; i++) {
709 struct xfrm_user_tmpl *up = &vec[i];
710 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
712 memcpy(&up->id, &kp->id, sizeof(up->id));
713 up->family = xp->family;
714 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
715 up->reqid = kp->reqid;
717 up->share = kp->share;
718 up->optional = kp->optional;
719 up->aalgos = kp->aalgos;
720 up->ealgos = kp->ealgos;
721 up->calgos = kp->calgos;
723 RTA_PUT(skb, XFRMA_TMPL,
724 (sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr),
733 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
735 struct xfrm_dump_info *sp = ptr;
736 struct xfrm_userpolicy_info *p;
737 struct sk_buff *in_skb = sp->in_skb;
738 struct sk_buff *skb = sp->out_skb;
739 struct nlmsghdr *nlh;
740 unsigned char *b = skb->tail;
742 if (sp->this_idx < sp->start_idx)
745 nlh = NLMSG_PUT(skb, NETLINK_CB(in_skb).pid,
747 XFRM_MSG_NEWPOLICY, sizeof(*p));
749 nlh->nlmsg_flags = sp->nlmsg_flags;
751 copy_to_user_policy(xp, p, dir);
752 if (copy_to_user_tmpl(xp, skb) < 0)
755 nlh->nlmsg_len = skb->tail - b;
761 skb_trim(skb, b - skb->data);
765 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
767 struct xfrm_dump_info info;
769 info.in_skb = cb->skb;
771 info.nlmsg_seq = cb->nlh->nlmsg_seq;
772 info.nlmsg_flags = NLM_F_MULTI;
774 info.start_idx = cb->args[0];
775 (void) xfrm_policy_walk(dump_one_policy, &info);
776 cb->args[0] = info.this_idx;
781 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
782 struct xfrm_policy *xp,
785 struct xfrm_dump_info info;
788 skb = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL);
790 return ERR_PTR(-ENOMEM);
792 NETLINK_CB(skb).dst_pid = NETLINK_CB(in_skb).pid;
793 info.in_skb = in_skb;
795 info.nlmsg_seq = seq;
796 info.nlmsg_flags = 0;
797 info.this_idx = info.start_idx = 0;
799 if (dump_one_policy(xp, dir, 0, &info) < 0) {
807 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
809 struct xfrm_policy *xp;
810 struct xfrm_userpolicy_id *p;
815 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
817 err = verify_policy_dir(p->dir);
822 xp = xfrm_policy_byid(p->dir, p->index, delete);
824 xp = xfrm_policy_bysel(p->dir, &p->sel, delete);
829 struct sk_buff *resp_skb;
831 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
832 if (IS_ERR(resp_skb)) {
833 err = PTR_ERR(resp_skb);
835 err = netlink_unicast(xfrm_nl, resp_skb,
846 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
848 struct xfrm_usersa_flush *p = NLMSG_DATA(nlh);
850 xfrm_state_flush(p->proto);
854 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh, void **xfrma)
860 #define XMSGSIZE(type) NLMSG_LENGTH(sizeof(struct type))
862 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
863 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
864 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
865 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
866 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
867 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
868 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
869 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
870 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
871 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
872 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
873 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
874 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
875 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
876 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = NLMSG_LENGTH(0),
881 static struct xfrm_link {
882 int (*doit)(struct sk_buff *, struct nlmsghdr *, void **);
883 int (*dump)(struct sk_buff *, struct netlink_callback *);
884 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
885 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
886 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
887 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
888 .dump = xfrm_dump_sa },
889 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
890 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
891 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
892 .dump = xfrm_dump_policy },
893 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
894 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
895 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
896 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
897 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
900 static int xfrm_done(struct netlink_callback *cb)
905 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh, int *errp)
907 struct rtattr *xfrma[XFRMA_MAX];
908 struct xfrm_link *link;
911 if (!(nlh->nlmsg_flags & NLM_F_REQUEST))
914 type = nlh->nlmsg_type;
916 /* A control message: ignore them */
917 if (type < XFRM_MSG_BASE)
920 /* Unknown message: reply with EINVAL */
921 if (type > XFRM_MSG_MAX)
924 type -= XFRM_MSG_BASE;
925 link = &xfrm_dispatch[type];
927 /* All operations require privileges, even GET */
928 if (security_netlink_recv(skb)) {
933 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
934 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
935 (nlh->nlmsg_flags & NLM_F_DUMP)) {
938 if (link->dump == NULL)
941 if ((*errp = netlink_dump_start(xfrm_nl, skb, nlh,
946 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
953 memset(xfrma, 0, sizeof(xfrma));
955 if (nlh->nlmsg_len < (min_len = xfrm_msg_min[type]))
958 if (nlh->nlmsg_len > min_len) {
959 int attrlen = nlh->nlmsg_len - NLMSG_ALIGN(min_len);
960 struct rtattr *attr = (void *) nlh + NLMSG_ALIGN(min_len);
962 while (RTA_OK(attr, attrlen)) {
963 unsigned short flavor = attr->rta_type;
965 if (flavor > XFRMA_MAX)
967 xfrma[flavor - 1] = attr;
969 attr = RTA_NEXT(attr, attrlen);
973 if (link->doit == NULL)
975 *errp = link->doit(skb, nlh, (void **) &xfrma);
984 static int xfrm_user_rcv_skb(struct sk_buff *skb)
987 struct nlmsghdr *nlh;
989 while (skb->len >= NLMSG_SPACE(0)) {
992 nlh = (struct nlmsghdr *) skb->data;
993 if (nlh->nlmsg_len < sizeof(*nlh) ||
994 skb->len < nlh->nlmsg_len)
996 rlen = NLMSG_ALIGN(nlh->nlmsg_len);
999 if (xfrm_user_rcv_msg(skb, nlh, &err) < 0) {
1002 netlink_ack(skb, nlh, err);
1003 } else if (nlh->nlmsg_flags & NLM_F_ACK)
1004 netlink_ack(skb, nlh, 0);
1005 skb_pull(skb, rlen);
1011 static void xfrm_netlink_rcv(struct sock *sk, int len)
1013 unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
1016 struct sk_buff *skb;
1018 down(&xfrm_cfg_sem);
1020 if (qlen > skb_queue_len(&sk->sk_receive_queue))
1021 qlen = skb_queue_len(&sk->sk_receive_queue);
1023 for (; qlen; qlen--) {
1024 skb = skb_dequeue(&sk->sk_receive_queue);
1025 if (xfrm_user_rcv_skb(skb)) {
1027 skb_queue_head(&sk->sk_receive_queue,
1043 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, int hard)
1045 struct xfrm_user_expire *ue;
1046 struct nlmsghdr *nlh;
1047 unsigned char *b = skb->tail;
1049 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_EXPIRE,
1051 ue = NLMSG_DATA(nlh);
1052 nlh->nlmsg_flags = 0;
1054 copy_to_user_state(x, &ue->state);
1055 ue->hard = (hard != 0) ? 1 : 0;
1057 nlh->nlmsg_len = skb->tail - b;
1061 skb_trim(skb, b - skb->data);
1065 static int xfrm_send_state_notify(struct xfrm_state *x, int hard)
1067 struct sk_buff *skb;
1069 skb = alloc_skb(sizeof(struct xfrm_user_expire) + 16, GFP_ATOMIC);
1073 if (build_expire(skb, x, hard) < 0)
1076 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1078 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1081 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
1082 struct xfrm_tmpl *xt, struct xfrm_policy *xp,
1085 struct xfrm_user_acquire *ua;
1086 struct nlmsghdr *nlh;
1087 unsigned char *b = skb->tail;
1088 __u32 seq = xfrm_get_acqseq();
1090 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_ACQUIRE,
1092 ua = NLMSG_DATA(nlh);
1093 nlh->nlmsg_flags = 0;
1095 memcpy(&ua->id, &x->id, sizeof(ua->id));
1096 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
1097 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
1098 copy_to_user_policy(xp, &ua->policy, dir);
1099 ua->aalgos = xt->aalgos;
1100 ua->ealgos = xt->ealgos;
1101 ua->calgos = xt->calgos;
1102 ua->seq = x->km.seq = seq;
1104 if (copy_to_user_tmpl(xp, skb) < 0)
1107 nlh->nlmsg_len = skb->tail - b;
1111 skb_trim(skb, b - skb->data);
1115 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
1116 struct xfrm_policy *xp, int dir)
1118 struct sk_buff *skb;
1121 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1122 len += NLMSG_SPACE(sizeof(struct xfrm_user_acquire));
1123 skb = alloc_skb(len, GFP_ATOMIC);
1127 if (build_acquire(skb, x, xt, xp, dir) < 0)
1130 NETLINK_CB(skb).dst_groups = XFRMGRP_ACQUIRE;
1132 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_ACQUIRE, GFP_ATOMIC);
1135 /* User gives us xfrm_user_policy_info followed by an array of 0
1136 * or more templates.
1138 static struct xfrm_policy *xfrm_compile_policy(u16 family, int opt,
1139 u8 *data, int len, int *dir)
1141 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
1142 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
1143 struct xfrm_policy *xp;
1148 if (opt != IP_XFRM_POLICY) {
1153 #if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
1155 if (opt != IPV6_XFRM_POLICY) {
1168 if (len < sizeof(*p) ||
1169 verify_newpolicy_info(p))
1172 nr = ((len - sizeof(*p)) / sizeof(*ut));
1173 if (nr > XFRM_MAX_DEPTH)
1176 xp = xfrm_policy_alloc(GFP_KERNEL);
1182 copy_from_user_policy(xp, p);
1183 copy_templates(xp, ut, nr);
1190 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
1193 struct xfrm_user_polexpire *upe;
1194 struct nlmsghdr *nlh;
1195 unsigned char *b = skb->tail;
1197 nlh = NLMSG_PUT(skb, 0, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe));
1198 upe = NLMSG_DATA(nlh);
1199 nlh->nlmsg_flags = 0;
1201 copy_to_user_policy(xp, &upe->pol, dir);
1202 if (copy_to_user_tmpl(xp, skb) < 0)
1206 nlh->nlmsg_len = skb->tail - b;
1210 skb_trim(skb, b - skb->data);
1214 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, int hard)
1216 struct sk_buff *skb;
1219 len = RTA_SPACE(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
1220 len += NLMSG_SPACE(sizeof(struct xfrm_user_polexpire));
1221 skb = alloc_skb(len, GFP_ATOMIC);
1225 if (build_polexpire(skb, xp, dir, hard) < 0)
1228 NETLINK_CB(skb).dst_groups = XFRMGRP_EXPIRE;
1230 return netlink_broadcast(xfrm_nl, skb, 0, XFRMGRP_EXPIRE, GFP_ATOMIC);
1233 static struct xfrm_mgr netlink_mgr = {
1235 .notify = xfrm_send_state_notify,
1236 .acquire = xfrm_send_acquire,
1237 .compile_policy = xfrm_compile_policy,
1238 .notify_policy = xfrm_send_policy_notify,
1241 static int __init xfrm_user_init(void)
1243 printk(KERN_INFO "Initializing IPsec netlink socket\n");
1245 xfrm_nl = netlink_kernel_create(NETLINK_XFRM, xfrm_netlink_rcv);
1246 if (xfrm_nl == NULL)
1249 xfrm_register_km(&netlink_mgr);
1254 static void __exit xfrm_user_exit(void)
1256 xfrm_unregister_km(&netlink_mgr);
1257 sock_release(xfrm_nl->sk_socket);
1260 module_init(xfrm_user_init);
1261 module_exit(xfrm_user_exit);
1262 MODULE_LICENSE("GPL");