1 /* xfrm_user.c: User interface to configure xfrm engine.
7 * Kazunori MIYAZAWA @USAGI
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>
28 #include <net/netlink.h>
30 #include <asm/uaccess.h>
31 #if IS_ENABLED(CONFIG_IPV6)
32 #include <linux/in6.h>
35 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
37 struct nlattr *rt = attrs[type];
38 struct xfrm_algo *algp;
44 if (nla_len(rt) < xfrm_alg_len(algp))
57 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
61 static int verify_auth_trunc(struct nlattr **attrs)
63 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
64 struct xfrm_algo_auth *algp;
70 if (nla_len(rt) < xfrm_alg_auth_len(algp))
73 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
77 static int verify_aead(struct nlattr **attrs)
79 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
80 struct xfrm_algo_aead *algp;
86 if (nla_len(rt) < aead_len(algp))
89 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
93 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
94 xfrm_address_t **addrp)
96 struct nlattr *rt = attrs[type];
99 *addrp = nla_data(rt);
102 static inline int verify_sec_ctx_len(struct nlattr **attrs)
104 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
105 struct xfrm_user_sec_ctx *uctx;
111 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
117 static inline int verify_replay(struct xfrm_usersa_info *p,
118 struct nlattr **attrs)
120 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
121 struct xfrm_replay_state_esn *rs;
123 if (p->flags & XFRM_STATE_ESN) {
129 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
132 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
133 nla_len(rt) != sizeof(*rs))
140 /* As only ESP and AH support ESN feature. */
141 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
144 if (p->replay_window != 0)
150 static int verify_newsa_info(struct xfrm_usersa_info *p,
151 struct nlattr **attrs)
161 #if IS_ENABLED(CONFIG_IPV6)
173 switch (p->id.proto) {
175 if ((!attrs[XFRMA_ALG_AUTH] &&
176 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
177 attrs[XFRMA_ALG_AEAD] ||
178 attrs[XFRMA_ALG_CRYPT] ||
179 attrs[XFRMA_ALG_COMP] ||
185 if (attrs[XFRMA_ALG_COMP])
187 if (!attrs[XFRMA_ALG_AUTH] &&
188 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
189 !attrs[XFRMA_ALG_CRYPT] &&
190 !attrs[XFRMA_ALG_AEAD])
192 if ((attrs[XFRMA_ALG_AUTH] ||
193 attrs[XFRMA_ALG_AUTH_TRUNC] ||
194 attrs[XFRMA_ALG_CRYPT]) &&
195 attrs[XFRMA_ALG_AEAD])
197 if (attrs[XFRMA_TFCPAD] &&
198 p->mode != XFRM_MODE_TUNNEL)
203 if (!attrs[XFRMA_ALG_COMP] ||
204 attrs[XFRMA_ALG_AEAD] ||
205 attrs[XFRMA_ALG_AUTH] ||
206 attrs[XFRMA_ALG_AUTH_TRUNC] ||
207 attrs[XFRMA_ALG_CRYPT] ||
208 attrs[XFRMA_TFCPAD] ||
209 (ntohl(p->id.spi) >= 0x10000))
213 #if IS_ENABLED(CONFIG_IPV6)
214 case IPPROTO_DSTOPTS:
215 case IPPROTO_ROUTING:
216 if (attrs[XFRMA_ALG_COMP] ||
217 attrs[XFRMA_ALG_AUTH] ||
218 attrs[XFRMA_ALG_AUTH_TRUNC] ||
219 attrs[XFRMA_ALG_AEAD] ||
220 attrs[XFRMA_ALG_CRYPT] ||
221 attrs[XFRMA_ENCAP] ||
222 attrs[XFRMA_SEC_CTX] ||
223 attrs[XFRMA_TFCPAD] ||
224 !attrs[XFRMA_COADDR])
233 if ((err = verify_aead(attrs)))
235 if ((err = verify_auth_trunc(attrs)))
237 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
239 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
241 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
243 if ((err = verify_sec_ctx_len(attrs)))
245 if ((err = verify_replay(p, attrs)))
250 case XFRM_MODE_TRANSPORT:
251 case XFRM_MODE_TUNNEL:
252 case XFRM_MODE_ROUTEOPTIMIZATION:
266 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
267 struct xfrm_algo_desc *(*get_byname)(const char *, int),
270 struct xfrm_algo *p, *ualg;
271 struct xfrm_algo_desc *algo;
276 ualg = nla_data(rta);
278 algo = get_byname(ualg->alg_name, 1);
281 *props = algo->desc.sadb_alg_id;
283 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
287 strcpy(p->alg_name, algo->name);
292 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
294 struct xfrm_algo *p, *ualg;
295 struct xfrm_algo_desc *algo;
300 ualg = nla_data(rta);
302 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
305 x->props.ealgo = algo->desc.sadb_alg_id;
307 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
311 strcpy(p->alg_name, algo->name);
313 x->geniv = algo->uinfo.encr.geniv;
317 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
320 struct xfrm_algo *ualg;
321 struct xfrm_algo_auth *p;
322 struct xfrm_algo_desc *algo;
327 ualg = nla_data(rta);
329 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
332 *props = algo->desc.sadb_alg_id;
334 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
338 strcpy(p->alg_name, algo->name);
339 p->alg_key_len = ualg->alg_key_len;
340 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
341 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
347 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
350 struct xfrm_algo_auth *p, *ualg;
351 struct xfrm_algo_desc *algo;
356 ualg = nla_data(rta);
358 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
361 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
363 *props = algo->desc.sadb_alg_id;
365 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
369 strcpy(p->alg_name, algo->name);
370 if (!p->alg_trunc_len)
371 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
377 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
379 struct xfrm_algo_aead *p, *ualg;
380 struct xfrm_algo_desc *algo;
385 ualg = nla_data(rta);
387 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
390 x->props.ealgo = algo->desc.sadb_alg_id;
392 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
396 strcpy(p->alg_name, algo->name);
398 x->geniv = algo->uinfo.aead.geniv;
402 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
405 struct xfrm_replay_state_esn *up;
408 if (!replay_esn || !rp)
412 ulen = xfrm_replay_state_esn_len(up);
414 if (nla_len(rp) < ulen || xfrm_replay_state_esn_len(replay_esn) != ulen)
420 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
421 struct xfrm_replay_state_esn **preplay_esn,
424 struct xfrm_replay_state_esn *p, *pp, *up;
431 klen = xfrm_replay_state_esn_len(up);
432 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
434 p = kzalloc(klen, GFP_KERNEL);
438 pp = kzalloc(klen, GFP_KERNEL);
445 memcpy(pp, up, ulen);
453 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
458 len += sizeof(struct xfrm_user_sec_ctx);
459 len += xfrm_ctx->ctx_len;
464 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
466 memcpy(&x->id, &p->id, sizeof(x->id));
467 memcpy(&x->sel, &p->sel, sizeof(x->sel));
468 memcpy(&x->lft, &p->lft, sizeof(x->lft));
469 x->props.mode = p->mode;
470 x->props.replay_window = min_t(unsigned int, p->replay_window,
471 sizeof(x->replay.bitmap) * 8);
472 x->props.reqid = p->reqid;
473 x->props.family = p->family;
474 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
475 x->props.flags = p->flags;
477 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
478 x->sel.family = p->family;
482 * someday when pfkey also has support, we could have the code
483 * somehow made shareable and move it to xfrm_state.c - JHS
486 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
489 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
490 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
491 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
492 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
493 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
496 struct xfrm_replay_state_esn *replay_esn;
497 replay_esn = nla_data(re);
498 memcpy(x->replay_esn, replay_esn,
499 xfrm_replay_state_esn_len(replay_esn));
500 memcpy(x->preplay_esn, replay_esn,
501 xfrm_replay_state_esn_len(replay_esn));
505 struct xfrm_replay_state *replay;
506 replay = nla_data(rp);
507 memcpy(&x->replay, replay, sizeof(*replay));
508 memcpy(&x->preplay, replay, sizeof(*replay));
512 struct xfrm_lifetime_cur *ltime;
513 ltime = nla_data(lt);
514 x->curlft.bytes = ltime->bytes;
515 x->curlft.packets = ltime->packets;
516 x->curlft.add_time = ltime->add_time;
517 x->curlft.use_time = ltime->use_time;
521 x->replay_maxage = nla_get_u32(et);
524 x->replay_maxdiff = nla_get_u32(rt);
527 static struct xfrm_state *xfrm_state_construct(struct net *net,
528 struct xfrm_usersa_info *p,
529 struct nlattr **attrs,
532 struct xfrm_state *x = xfrm_state_alloc(net);
538 copy_from_user_state(x, p);
540 if (attrs[XFRMA_SA_EXTRA_FLAGS])
541 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
543 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
545 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
546 attrs[XFRMA_ALG_AUTH_TRUNC])))
548 if (!x->props.aalgo) {
549 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
550 attrs[XFRMA_ALG_AUTH])))
553 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
555 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
556 xfrm_calg_get_byname,
557 attrs[XFRMA_ALG_COMP])))
560 if (attrs[XFRMA_ENCAP]) {
561 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
562 sizeof(*x->encap), GFP_KERNEL);
563 if (x->encap == NULL)
567 if (attrs[XFRMA_TFCPAD])
568 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
570 if (attrs[XFRMA_COADDR]) {
571 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
572 sizeof(*x->coaddr), GFP_KERNEL);
573 if (x->coaddr == NULL)
577 xfrm_mark_get(attrs, &x->mark);
579 err = __xfrm_init_state(x, false);
583 if (attrs[XFRMA_SEC_CTX] &&
584 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
587 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
588 attrs[XFRMA_REPLAY_ESN_VAL])))
592 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
593 /* sysctl_xfrm_aevent_etime is in 100ms units */
594 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
596 if ((err = xfrm_init_replay(x)))
599 /* override default values from above */
600 xfrm_update_ae_params(x, attrs, 0);
605 x->km.state = XFRM_STATE_DEAD;
612 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
613 struct nlattr **attrs)
615 struct net *net = sock_net(skb->sk);
616 struct xfrm_usersa_info *p = nlmsg_data(nlh);
617 struct xfrm_state *x;
621 err = verify_newsa_info(p, attrs);
625 x = xfrm_state_construct(net, p, attrs, &err);
630 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
631 err = xfrm_state_add(x);
633 err = xfrm_state_update(x);
635 xfrm_audit_state_add(x, err ? 0 : 1, true);
638 x->km.state = XFRM_STATE_DEAD;
643 c.seq = nlh->nlmsg_seq;
644 c.portid = nlh->nlmsg_pid;
645 c.event = nlh->nlmsg_type;
647 km_state_notify(x, &c);
653 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
654 struct xfrm_usersa_id *p,
655 struct nlattr **attrs,
658 struct xfrm_state *x = NULL;
661 u32 mark = xfrm_mark_get(attrs, &m);
663 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
665 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
667 xfrm_address_t *saddr = NULL;
669 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
676 x = xfrm_state_lookup_byaddr(net, mark,
678 p->proto, p->family);
687 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
688 struct nlattr **attrs)
690 struct net *net = sock_net(skb->sk);
691 struct xfrm_state *x;
694 struct xfrm_usersa_id *p = nlmsg_data(nlh);
696 x = xfrm_user_state_lookup(net, p, attrs, &err);
700 if ((err = security_xfrm_state_delete(x)) != 0)
703 if (xfrm_state_kern(x)) {
708 err = xfrm_state_delete(x);
713 c.seq = nlh->nlmsg_seq;
714 c.portid = nlh->nlmsg_pid;
715 c.event = nlh->nlmsg_type;
716 km_state_notify(x, &c);
719 xfrm_audit_state_delete(x, err ? 0 : 1, true);
724 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
726 memset(p, 0, sizeof(*p));
727 memcpy(&p->id, &x->id, sizeof(p->id));
728 memcpy(&p->sel, &x->sel, sizeof(p->sel));
729 memcpy(&p->lft, &x->lft, sizeof(p->lft));
730 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
731 memcpy(&p->stats, &x->stats, sizeof(p->stats));
732 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
733 p->mode = x->props.mode;
734 p->replay_window = x->props.replay_window;
735 p->reqid = x->props.reqid;
736 p->family = x->props.family;
737 p->flags = x->props.flags;
741 struct xfrm_dump_info {
742 struct sk_buff *in_skb;
743 struct sk_buff *out_skb;
748 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
750 struct xfrm_user_sec_ctx *uctx;
752 int ctx_size = sizeof(*uctx) + s->ctx_len;
754 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
758 uctx = nla_data(attr);
759 uctx->exttype = XFRMA_SEC_CTX;
760 uctx->len = ctx_size;
761 uctx->ctx_doi = s->ctx_doi;
762 uctx->ctx_alg = s->ctx_alg;
763 uctx->ctx_len = s->ctx_len;
764 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
769 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
771 struct xfrm_algo *algo;
774 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
775 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
779 algo = nla_data(nla);
780 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
781 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
782 algo->alg_key_len = auth->alg_key_len;
787 /* Don't change this without updating xfrm_sa_len! */
788 static int copy_to_user_state_extra(struct xfrm_state *x,
789 struct xfrm_usersa_info *p,
794 copy_to_user_state(x, p);
796 if (x->props.extra_flags) {
797 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
798 x->props.extra_flags);
804 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
809 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
814 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
819 ret = copy_to_user_auth(x->aalg, skb);
821 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
822 xfrm_alg_auth_len(x->aalg), x->aalg);
827 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
832 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
837 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
842 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
846 ret = xfrm_mark_put(skb, &x->mark);
850 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
851 xfrm_replay_state_esn_len(x->replay_esn),
854 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
859 ret = copy_sec_ctx(x->security, skb);
864 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
866 struct xfrm_dump_info *sp = ptr;
867 struct sk_buff *in_skb = sp->in_skb;
868 struct sk_buff *skb = sp->out_skb;
869 struct xfrm_usersa_info *p;
870 struct nlmsghdr *nlh;
873 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
874 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
880 err = copy_to_user_state_extra(x, p, skb);
882 nlmsg_cancel(skb, nlh);
889 static int xfrm_dump_sa_done(struct netlink_callback *cb)
891 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
892 struct sock *sk = cb->skb->sk;
893 struct net *net = sock_net(sk);
895 xfrm_state_walk_done(walk, net);
899 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
900 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
902 struct net *net = sock_net(skb->sk);
903 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
904 struct xfrm_dump_info info;
906 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
907 sizeof(cb->args) - sizeof(cb->args[0]));
909 info.in_skb = cb->skb;
911 info.nlmsg_seq = cb->nlh->nlmsg_seq;
912 info.nlmsg_flags = NLM_F_MULTI;
915 struct nlattr *attrs[XFRMA_MAX+1];
916 struct xfrm_address_filter *filter = NULL;
922 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
927 if (attrs[XFRMA_ADDRESS_FILTER]) {
928 filter = kmalloc(sizeof(*filter), GFP_KERNEL);
932 memcpy(filter, nla_data(attrs[XFRMA_ADDRESS_FILTER]),
936 if (attrs[XFRMA_PROTO])
937 proto = nla_get_u8(attrs[XFRMA_PROTO]);
939 xfrm_state_walk_init(walk, proto, filter);
942 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
947 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
948 struct xfrm_state *x, u32 seq)
950 struct xfrm_dump_info info;
954 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
956 return ERR_PTR(-ENOMEM);
958 info.in_skb = in_skb;
960 info.nlmsg_seq = seq;
961 info.nlmsg_flags = 0;
963 err = dump_one_state(x, 0, &info);
972 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
973 * Must be called with RCU read lock.
975 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
976 u32 pid, unsigned int group)
978 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
981 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
986 static inline size_t xfrm_spdinfo_msgsize(void)
988 return NLMSG_ALIGN(4)
989 + nla_total_size(sizeof(struct xfrmu_spdinfo))
990 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
991 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
992 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
995 static int build_spdinfo(struct sk_buff *skb, struct net *net,
996 u32 portid, u32 seq, u32 flags)
998 struct xfrmk_spdinfo si;
999 struct xfrmu_spdinfo spc;
1000 struct xfrmu_spdhinfo sph;
1001 struct xfrmu_spdhthresh spt4, spt6;
1002 struct nlmsghdr *nlh;
1007 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1008 if (nlh == NULL) /* shouldn't really happen ... */
1011 f = nlmsg_data(nlh);
1013 xfrm_spd_getinfo(net, &si);
1014 spc.incnt = si.incnt;
1015 spc.outcnt = si.outcnt;
1016 spc.fwdcnt = si.fwdcnt;
1017 spc.inscnt = si.inscnt;
1018 spc.outscnt = si.outscnt;
1019 spc.fwdscnt = si.fwdscnt;
1020 sph.spdhcnt = si.spdhcnt;
1021 sph.spdhmcnt = si.spdhmcnt;
1024 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1026 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1027 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1028 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1029 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1030 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1032 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1034 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1036 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1038 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1040 nlmsg_cancel(skb, nlh);
1044 nlmsg_end(skb, nlh);
1048 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1049 struct nlattr **attrs)
1051 struct net *net = sock_net(skb->sk);
1052 struct xfrmu_spdhthresh *thresh4 = NULL;
1053 struct xfrmu_spdhthresh *thresh6 = NULL;
1055 /* selector prefixlen thresholds to hash policies */
1056 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1057 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1059 if (nla_len(rta) < sizeof(*thresh4))
1061 thresh4 = nla_data(rta);
1062 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1065 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1066 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1068 if (nla_len(rta) < sizeof(*thresh6))
1070 thresh6 = nla_data(rta);
1071 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1075 if (thresh4 || thresh6) {
1076 write_seqlock(&net->xfrm.policy_hthresh.lock);
1078 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1079 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1082 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1083 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1085 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1087 xfrm_policy_hash_rebuild(net);
1093 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1094 struct nlattr **attrs)
1096 struct net *net = sock_net(skb->sk);
1097 struct sk_buff *r_skb;
1098 u32 *flags = nlmsg_data(nlh);
1099 u32 sportid = NETLINK_CB(skb).portid;
1100 u32 seq = nlh->nlmsg_seq;
1102 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1106 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1109 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1112 static inline size_t xfrm_sadinfo_msgsize(void)
1114 return NLMSG_ALIGN(4)
1115 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1116 + nla_total_size(4); /* XFRMA_SAD_CNT */
1119 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1120 u32 portid, u32 seq, u32 flags)
1122 struct xfrmk_sadinfo si;
1123 struct xfrmu_sadhinfo sh;
1124 struct nlmsghdr *nlh;
1128 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1129 if (nlh == NULL) /* shouldn't really happen ... */
1132 f = nlmsg_data(nlh);
1134 xfrm_sad_getinfo(net, &si);
1136 sh.sadhmcnt = si.sadhmcnt;
1137 sh.sadhcnt = si.sadhcnt;
1139 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1141 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1143 nlmsg_cancel(skb, nlh);
1147 nlmsg_end(skb, nlh);
1151 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1152 struct nlattr **attrs)
1154 struct net *net = sock_net(skb->sk);
1155 struct sk_buff *r_skb;
1156 u32 *flags = nlmsg_data(nlh);
1157 u32 sportid = NETLINK_CB(skb).portid;
1158 u32 seq = nlh->nlmsg_seq;
1160 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1164 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1167 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1170 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1171 struct nlattr **attrs)
1173 struct net *net = sock_net(skb->sk);
1174 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1175 struct xfrm_state *x;
1176 struct sk_buff *resp_skb;
1179 x = xfrm_user_state_lookup(net, p, attrs, &err);
1183 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1184 if (IS_ERR(resp_skb)) {
1185 err = PTR_ERR(resp_skb);
1187 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1194 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1195 struct nlattr **attrs)
1197 struct net *net = sock_net(skb->sk);
1198 struct xfrm_state *x;
1199 struct xfrm_userspi_info *p;
1200 struct sk_buff *resp_skb;
1201 xfrm_address_t *daddr;
1207 p = nlmsg_data(nlh);
1208 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1212 family = p->info.family;
1213 daddr = &p->info.id.daddr;
1217 mark = xfrm_mark_get(attrs, &m);
1219 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1220 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1227 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1228 p->info.id.proto, daddr,
1235 err = xfrm_alloc_spi(x, p->min, p->max);
1239 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1240 if (IS_ERR(resp_skb)) {
1241 err = PTR_ERR(resp_skb);
1245 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1253 static int verify_policy_dir(u8 dir)
1256 case XFRM_POLICY_IN:
1257 case XFRM_POLICY_OUT:
1258 case XFRM_POLICY_FWD:
1268 static int verify_policy_type(u8 type)
1271 case XFRM_POLICY_TYPE_MAIN:
1272 #ifdef CONFIG_XFRM_SUB_POLICY
1273 case XFRM_POLICY_TYPE_SUB:
1284 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1289 case XFRM_SHARE_ANY:
1290 case XFRM_SHARE_SESSION:
1291 case XFRM_SHARE_USER:
1292 case XFRM_SHARE_UNIQUE:
1299 switch (p->action) {
1300 case XFRM_POLICY_ALLOW:
1301 case XFRM_POLICY_BLOCK:
1308 switch (p->sel.family) {
1313 #if IS_ENABLED(CONFIG_IPV6)
1316 return -EAFNOSUPPORT;
1323 ret = verify_policy_dir(p->dir);
1326 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1332 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1334 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1335 struct xfrm_user_sec_ctx *uctx;
1340 uctx = nla_data(rt);
1341 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1344 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1350 for (i = 0; i < nr; i++, ut++) {
1351 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1353 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1354 memcpy(&t->saddr, &ut->saddr,
1355 sizeof(xfrm_address_t));
1356 t->reqid = ut->reqid;
1358 t->share = ut->share;
1359 t->optional = ut->optional;
1360 t->aalgos = ut->aalgos;
1361 t->ealgos = ut->ealgos;
1362 t->calgos = ut->calgos;
1363 /* If all masks are ~0, then we allow all algorithms. */
1364 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1365 t->encap_family = ut->family;
1369 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1373 if (nr > XFRM_MAX_DEPTH)
1376 for (i = 0; i < nr; i++) {
1377 /* We never validated the ut->family value, so many
1378 * applications simply leave it at zero. The check was
1379 * never made and ut->family was ignored because all
1380 * templates could be assumed to have the same family as
1381 * the policy itself. Now that we will have ipv4-in-ipv6
1382 * and ipv6-in-ipv4 tunnels, this is no longer true.
1385 ut[i].family = family;
1387 switch (ut[i].family) {
1390 #if IS_ENABLED(CONFIG_IPV6)
1402 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1404 struct nlattr *rt = attrs[XFRMA_TMPL];
1409 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1410 int nr = nla_len(rt) / sizeof(*utmpl);
1413 err = validate_tmpl(nr, utmpl, pol->family);
1417 copy_templates(pol, utmpl, nr);
1422 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1424 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1425 struct xfrm_userpolicy_type *upt;
1426 u8 type = XFRM_POLICY_TYPE_MAIN;
1434 err = verify_policy_type(type);
1442 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1444 xp->priority = p->priority;
1445 xp->index = p->index;
1446 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1447 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1448 xp->action = p->action;
1449 xp->flags = p->flags;
1450 xp->family = p->sel.family;
1451 /* XXX xp->share = p->share; */
1454 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1456 memset(p, 0, sizeof(*p));
1457 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1458 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1459 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1460 p->priority = xp->priority;
1461 p->index = xp->index;
1462 p->sel.family = xp->family;
1464 p->action = xp->action;
1465 p->flags = xp->flags;
1466 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1469 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1471 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1479 copy_from_user_policy(xp, p);
1481 err = copy_from_user_policy_type(&xp->type, attrs);
1485 if (!(err = copy_from_user_tmpl(xp, attrs)))
1486 err = copy_from_user_sec_ctx(xp, attrs);
1490 xfrm_mark_get(attrs, &xp->mark);
1496 xfrm_policy_destroy(xp);
1500 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1501 struct nlattr **attrs)
1503 struct net *net = sock_net(skb->sk);
1504 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1505 struct xfrm_policy *xp;
1510 err = verify_newpolicy_info(p);
1513 err = verify_sec_ctx_len(attrs);
1517 xp = xfrm_policy_construct(net, p, attrs, &err);
1521 /* shouldn't excl be based on nlh flags??
1522 * Aha! this is anti-netlink really i.e more pfkey derived
1523 * in netlink excl is a flag and you wouldnt need
1524 * a type XFRM_MSG_UPDPOLICY - JHS */
1525 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1526 err = xfrm_policy_insert(p->dir, xp, excl);
1527 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1530 security_xfrm_policy_free(xp->security);
1535 c.event = nlh->nlmsg_type;
1536 c.seq = nlh->nlmsg_seq;
1537 c.portid = nlh->nlmsg_pid;
1538 km_policy_notify(xp, p->dir, &c);
1545 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1547 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1550 if (xp->xfrm_nr == 0)
1553 for (i = 0; i < xp->xfrm_nr; i++) {
1554 struct xfrm_user_tmpl *up = &vec[i];
1555 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1557 memset(up, 0, sizeof(*up));
1558 memcpy(&up->id, &kp->id, sizeof(up->id));
1559 up->family = kp->encap_family;
1560 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1561 up->reqid = kp->reqid;
1562 up->mode = kp->mode;
1563 up->share = kp->share;
1564 up->optional = kp->optional;
1565 up->aalgos = kp->aalgos;
1566 up->ealgos = kp->ealgos;
1567 up->calgos = kp->calgos;
1570 return nla_put(skb, XFRMA_TMPL,
1571 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1574 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1577 return copy_sec_ctx(x->security, skb);
1582 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1585 return copy_sec_ctx(xp->security, skb);
1588 static inline size_t userpolicy_type_attrsize(void)
1590 #ifdef CONFIG_XFRM_SUB_POLICY
1591 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1597 #ifdef CONFIG_XFRM_SUB_POLICY
1598 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1600 struct xfrm_userpolicy_type upt = {
1604 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1608 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1614 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1616 struct xfrm_dump_info *sp = ptr;
1617 struct xfrm_userpolicy_info *p;
1618 struct sk_buff *in_skb = sp->in_skb;
1619 struct sk_buff *skb = sp->out_skb;
1620 struct nlmsghdr *nlh;
1623 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1624 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1628 p = nlmsg_data(nlh);
1629 copy_to_user_policy(xp, p, dir);
1630 err = copy_to_user_tmpl(xp, skb);
1632 err = copy_to_user_sec_ctx(xp, skb);
1634 err = copy_to_user_policy_type(xp->type, skb);
1636 err = xfrm_mark_put(skb, &xp->mark);
1638 nlmsg_cancel(skb, nlh);
1641 nlmsg_end(skb, nlh);
1645 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1647 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1648 struct net *net = sock_net(cb->skb->sk);
1650 xfrm_policy_walk_done(walk, net);
1654 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1656 struct net *net = sock_net(skb->sk);
1657 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *) &cb->args[1];
1658 struct xfrm_dump_info info;
1660 BUILD_BUG_ON(sizeof(struct xfrm_policy_walk) >
1661 sizeof(cb->args) - sizeof(cb->args[0]));
1663 info.in_skb = cb->skb;
1665 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1666 info.nlmsg_flags = NLM_F_MULTI;
1670 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1673 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1678 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1679 struct xfrm_policy *xp,
1682 struct xfrm_dump_info info;
1683 struct sk_buff *skb;
1686 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1688 return ERR_PTR(-ENOMEM);
1690 info.in_skb = in_skb;
1692 info.nlmsg_seq = seq;
1693 info.nlmsg_flags = 0;
1695 err = dump_one_policy(xp, dir, 0, &info);
1698 return ERR_PTR(err);
1704 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1705 struct nlattr **attrs)
1707 struct net *net = sock_net(skb->sk);
1708 struct xfrm_policy *xp;
1709 struct xfrm_userpolicy_id *p;
1710 u8 type = XFRM_POLICY_TYPE_MAIN;
1715 u32 mark = xfrm_mark_get(attrs, &m);
1717 p = nlmsg_data(nlh);
1718 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1720 err = copy_from_user_policy_type(&type, attrs);
1724 err = verify_policy_dir(p->dir);
1729 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1731 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1732 struct xfrm_sec_ctx *ctx;
1734 err = verify_sec_ctx_len(attrs);
1740 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1742 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1746 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1748 security_xfrm_policy_free(ctx);
1754 struct sk_buff *resp_skb;
1756 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1757 if (IS_ERR(resp_skb)) {
1758 err = PTR_ERR(resp_skb);
1760 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1761 NETLINK_CB(skb).portid);
1764 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1769 c.data.byid = p->index;
1770 c.event = nlh->nlmsg_type;
1771 c.seq = nlh->nlmsg_seq;
1772 c.portid = nlh->nlmsg_pid;
1773 km_policy_notify(xp, p->dir, &c);
1778 if (delete && err == 0)
1779 xfrm_garbage_collect(net);
1783 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1784 struct nlattr **attrs)
1786 struct net *net = sock_net(skb->sk);
1788 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1791 err = xfrm_state_flush(net, p->proto, true);
1793 if (err == -ESRCH) /* empty table */
1797 c.data.proto = p->proto;
1798 c.event = nlh->nlmsg_type;
1799 c.seq = nlh->nlmsg_seq;
1800 c.portid = nlh->nlmsg_pid;
1802 km_state_notify(NULL, &c);
1807 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1809 size_t replay_size = x->replay_esn ?
1810 xfrm_replay_state_esn_len(x->replay_esn) :
1811 sizeof(struct xfrm_replay_state);
1813 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1814 + nla_total_size(replay_size)
1815 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1816 + nla_total_size(sizeof(struct xfrm_mark))
1817 + nla_total_size(4) /* XFRM_AE_RTHR */
1818 + nla_total_size(4); /* XFRM_AE_ETHR */
1821 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1823 struct xfrm_aevent_id *id;
1824 struct nlmsghdr *nlh;
1827 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1831 id = nlmsg_data(nlh);
1832 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1833 id->sa_id.spi = x->id.spi;
1834 id->sa_id.family = x->props.family;
1835 id->sa_id.proto = x->id.proto;
1836 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1837 id->reqid = x->props.reqid;
1838 id->flags = c->data.aevent;
1840 if (x->replay_esn) {
1841 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1842 xfrm_replay_state_esn_len(x->replay_esn),
1845 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1850 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1854 if (id->flags & XFRM_AE_RTHR) {
1855 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1859 if (id->flags & XFRM_AE_ETHR) {
1860 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1861 x->replay_maxage * 10 / HZ);
1865 err = xfrm_mark_put(skb, &x->mark);
1869 nlmsg_end(skb, nlh);
1873 nlmsg_cancel(skb, nlh);
1877 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1878 struct nlattr **attrs)
1880 struct net *net = sock_net(skb->sk);
1881 struct xfrm_state *x;
1882 struct sk_buff *r_skb;
1887 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1888 struct xfrm_usersa_id *id = &p->sa_id;
1890 mark = xfrm_mark_get(attrs, &m);
1892 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1896 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1897 if (r_skb == NULL) {
1903 * XXX: is this lock really needed - none of the other
1904 * gets lock (the concern is things getting updated
1905 * while we are still reading) - jhs
1907 spin_lock_bh(&x->lock);
1908 c.data.aevent = p->flags;
1909 c.seq = nlh->nlmsg_seq;
1910 c.portid = nlh->nlmsg_pid;
1912 if (build_aevent(r_skb, x, &c) < 0)
1914 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1915 spin_unlock_bh(&x->lock);
1920 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1921 struct nlattr **attrs)
1923 struct net *net = sock_net(skb->sk);
1924 struct xfrm_state *x;
1929 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1930 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1931 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1932 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1934 if (!lt && !rp && !re)
1937 /* pedantic mode - thou shalt sayeth replaceth */
1938 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1941 mark = xfrm_mark_get(attrs, &m);
1943 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1947 if (x->km.state != XFRM_STATE_VALID)
1950 err = xfrm_replay_verify_len(x->replay_esn, re);
1954 spin_lock_bh(&x->lock);
1955 xfrm_update_ae_params(x, attrs, 1);
1956 spin_unlock_bh(&x->lock);
1958 c.event = nlh->nlmsg_type;
1959 c.seq = nlh->nlmsg_seq;
1960 c.portid = nlh->nlmsg_pid;
1961 c.data.aevent = XFRM_AE_CU;
1962 km_state_notify(x, &c);
1969 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1970 struct nlattr **attrs)
1972 struct net *net = sock_net(skb->sk);
1974 u8 type = XFRM_POLICY_TYPE_MAIN;
1977 err = copy_from_user_policy_type(&type, attrs);
1981 err = xfrm_policy_flush(net, type, true);
1983 if (err == -ESRCH) /* empty table */
1989 c.event = nlh->nlmsg_type;
1990 c.seq = nlh->nlmsg_seq;
1991 c.portid = nlh->nlmsg_pid;
1993 km_policy_notify(NULL, 0, &c);
1997 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
1998 struct nlattr **attrs)
2000 struct net *net = sock_net(skb->sk);
2001 struct xfrm_policy *xp;
2002 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2003 struct xfrm_userpolicy_info *p = &up->pol;
2004 u8 type = XFRM_POLICY_TYPE_MAIN;
2007 u32 mark = xfrm_mark_get(attrs, &m);
2009 err = copy_from_user_policy_type(&type, attrs);
2013 err = verify_policy_dir(p->dir);
2018 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2020 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2021 struct xfrm_sec_ctx *ctx;
2023 err = verify_sec_ctx_len(attrs);
2029 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2031 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2035 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2036 &p->sel, ctx, 0, &err);
2037 security_xfrm_policy_free(ctx);
2042 if (unlikely(xp->walk.dead))
2047 xfrm_policy_delete(xp, p->dir);
2048 xfrm_audit_policy_delete(xp, 1, true);
2050 // reset the timers here?
2051 WARN(1, "Dont know what to do with soft policy expire\n");
2053 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2060 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2061 struct nlattr **attrs)
2063 struct net *net = sock_net(skb->sk);
2064 struct xfrm_state *x;
2066 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2067 struct xfrm_usersa_info *p = &ue->state;
2069 u32 mark = xfrm_mark_get(attrs, &m);
2071 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2077 spin_lock_bh(&x->lock);
2079 if (x->km.state != XFRM_STATE_VALID)
2081 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2084 __xfrm_state_delete(x);
2085 xfrm_audit_state_delete(x, 1, true);
2089 spin_unlock_bh(&x->lock);
2094 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2095 struct nlattr **attrs)
2097 struct net *net = sock_net(skb->sk);
2098 struct xfrm_policy *xp;
2099 struct xfrm_user_tmpl *ut;
2101 struct nlattr *rt = attrs[XFRMA_TMPL];
2102 struct xfrm_mark mark;
2104 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2105 struct xfrm_state *x = xfrm_state_alloc(net);
2111 xfrm_mark_get(attrs, &mark);
2113 err = verify_newpolicy_info(&ua->policy);
2118 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2122 memcpy(&x->id, &ua->id, sizeof(ua->id));
2123 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2124 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2125 xp->mark.m = x->mark.m = mark.m;
2126 xp->mark.v = x->mark.v = mark.v;
2128 /* extract the templates and for each call km_key */
2129 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2130 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2131 memcpy(&x->id, &t->id, sizeof(x->id));
2132 x->props.mode = t->mode;
2133 x->props.reqid = t->reqid;
2134 x->props.family = ut->family;
2135 t->aalgos = ua->aalgos;
2136 t->ealgos = ua->ealgos;
2137 t->calgos = ua->calgos;
2138 err = km_query(x, t, xp);
2148 WARN(1, "BAD policy passed\n");
2155 #ifdef CONFIG_XFRM_MIGRATE
2156 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2157 struct xfrm_kmaddress *k,
2158 struct nlattr **attrs, int *num)
2160 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2161 struct xfrm_user_migrate *um;
2165 struct xfrm_user_kmaddress *uk;
2167 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2168 memcpy(&k->local, &uk->local, sizeof(k->local));
2169 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2170 k->family = uk->family;
2171 k->reserved = uk->reserved;
2175 num_migrate = nla_len(rt) / sizeof(*um);
2177 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2180 for (i = 0; i < num_migrate; i++, um++, ma++) {
2181 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2182 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2183 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2184 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2186 ma->proto = um->proto;
2187 ma->mode = um->mode;
2188 ma->reqid = um->reqid;
2190 ma->old_family = um->old_family;
2191 ma->new_family = um->new_family;
2198 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2199 struct nlattr **attrs)
2201 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2202 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2203 struct xfrm_kmaddress km, *kmp;
2207 struct net *net = sock_net(skb->sk);
2209 if (attrs[XFRMA_MIGRATE] == NULL)
2212 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2214 err = copy_from_user_policy_type(&type, attrs);
2218 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2225 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2230 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2231 struct nlattr **attrs)
2233 return -ENOPROTOOPT;
2237 #ifdef CONFIG_XFRM_MIGRATE
2238 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2240 struct xfrm_user_migrate um;
2242 memset(&um, 0, sizeof(um));
2243 um.proto = m->proto;
2245 um.reqid = m->reqid;
2246 um.old_family = m->old_family;
2247 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2248 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2249 um.new_family = m->new_family;
2250 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2251 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2253 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2256 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2258 struct xfrm_user_kmaddress uk;
2260 memset(&uk, 0, sizeof(uk));
2261 uk.family = k->family;
2262 uk.reserved = k->reserved;
2263 memcpy(&uk.local, &k->local, sizeof(uk.local));
2264 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2266 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2269 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2271 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2272 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2273 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2274 + userpolicy_type_attrsize();
2277 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2278 int num_migrate, const struct xfrm_kmaddress *k,
2279 const struct xfrm_selector *sel, u8 dir, u8 type)
2281 const struct xfrm_migrate *mp;
2282 struct xfrm_userpolicy_id *pol_id;
2283 struct nlmsghdr *nlh;
2286 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2290 pol_id = nlmsg_data(nlh);
2291 /* copy data from selector, dir, and type to the pol_id */
2292 memset(pol_id, 0, sizeof(*pol_id));
2293 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2297 err = copy_to_user_kmaddress(k, skb);
2301 err = copy_to_user_policy_type(type, skb);
2304 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2305 err = copy_to_user_migrate(mp, skb);
2310 nlmsg_end(skb, nlh);
2314 nlmsg_cancel(skb, nlh);
2318 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2319 const struct xfrm_migrate *m, int num_migrate,
2320 const struct xfrm_kmaddress *k)
2322 struct net *net = &init_net;
2323 struct sk_buff *skb;
2325 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2330 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2333 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2336 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2337 const struct xfrm_migrate *m, int num_migrate,
2338 const struct xfrm_kmaddress *k)
2340 return -ENOPROTOOPT;
2344 #define XMSGSIZE(type) sizeof(struct type)
2346 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2347 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2348 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2349 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2350 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2351 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2352 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2353 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2354 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2355 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2356 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2357 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2358 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2359 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2360 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2361 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2362 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2363 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2364 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2365 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2366 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2367 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2372 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2373 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2374 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2375 [XFRMA_LASTUSED] = { .type = NLA_U64},
2376 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2377 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2378 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2379 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2380 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2381 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2382 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2383 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2384 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2385 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2386 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2387 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2388 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2389 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2390 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2391 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2392 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2393 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2394 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2395 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2396 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2397 [XFRMA_PROTO] = { .type = NLA_U8 },
2398 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2401 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2402 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2403 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2406 static const struct xfrm_link {
2407 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2408 int (*dump)(struct sk_buff *, struct netlink_callback *);
2409 int (*done)(struct netlink_callback *);
2410 const struct nla_policy *nla_pol;
2412 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2413 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2414 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2415 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2416 .dump = xfrm_dump_sa,
2417 .done = xfrm_dump_sa_done },
2418 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2419 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2420 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2421 .dump = xfrm_dump_policy,
2422 .done = xfrm_dump_policy_done },
2423 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2424 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2425 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2426 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2427 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2428 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2429 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2430 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2431 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2432 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2433 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2434 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2435 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2436 .nla_pol = xfrma_spd_policy,
2437 .nla_max = XFRMA_SPD_MAX },
2438 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2441 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2443 struct net *net = sock_net(skb->sk);
2444 struct nlattr *attrs[XFRMA_MAX+1];
2445 const struct xfrm_link *link;
2448 #ifdef CONFIG_COMPAT
2449 if (is_compat_task())
2453 type = nlh->nlmsg_type;
2454 if (type > XFRM_MSG_MAX)
2457 type -= XFRM_MSG_BASE;
2458 link = &xfrm_dispatch[type];
2460 /* All operations require privileges, even GET */
2461 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2464 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2465 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2466 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2467 if (link->dump == NULL)
2471 struct netlink_dump_control c = {
2475 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2479 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2480 link->nla_max ? : XFRMA_MAX,
2481 link->nla_pol ? : xfrma_policy);
2485 if (link->doit == NULL)
2488 return link->doit(skb, nlh, attrs);
2491 static void xfrm_netlink_rcv(struct sk_buff *skb)
2493 struct net *net = sock_net(skb->sk);
2495 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2496 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2497 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2500 static inline size_t xfrm_expire_msgsize(void)
2502 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2503 + nla_total_size(sizeof(struct xfrm_mark));
2506 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2508 struct xfrm_user_expire *ue;
2509 struct nlmsghdr *nlh;
2512 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2516 ue = nlmsg_data(nlh);
2517 copy_to_user_state(x, &ue->state);
2518 ue->hard = (c->data.hard != 0) ? 1 : 0;
2520 err = xfrm_mark_put(skb, &x->mark);
2524 nlmsg_end(skb, nlh);
2528 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2530 struct net *net = xs_net(x);
2531 struct sk_buff *skb;
2533 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2537 if (build_expire(skb, x, c) < 0) {
2542 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2545 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2547 struct net *net = xs_net(x);
2548 struct sk_buff *skb;
2550 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2554 if (build_aevent(skb, x, c) < 0)
2557 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2560 static int xfrm_notify_sa_flush(const struct km_event *c)
2562 struct net *net = c->net;
2563 struct xfrm_usersa_flush *p;
2564 struct nlmsghdr *nlh;
2565 struct sk_buff *skb;
2566 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2568 skb = nlmsg_new(len, GFP_ATOMIC);
2572 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2578 p = nlmsg_data(nlh);
2579 p->proto = c->data.proto;
2581 nlmsg_end(skb, nlh);
2583 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2586 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2590 l += nla_total_size(aead_len(x->aead));
2592 l += nla_total_size(sizeof(struct xfrm_algo) +
2593 (x->aalg->alg_key_len + 7) / 8);
2594 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2597 l += nla_total_size(xfrm_alg_len(x->ealg));
2599 l += nla_total_size(sizeof(*x->calg));
2601 l += nla_total_size(sizeof(*x->encap));
2603 l += nla_total_size(sizeof(x->tfcpad));
2605 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2607 l += nla_total_size(sizeof(struct xfrm_replay_state));
2609 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2610 x->security->ctx_len);
2612 l += nla_total_size(sizeof(*x->coaddr));
2613 if (x->props.extra_flags)
2614 l += nla_total_size(sizeof(x->props.extra_flags));
2616 /* Must count x->lastused as it may become non-zero behind our back. */
2617 l += nla_total_size(sizeof(u64));
2622 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2624 struct net *net = xs_net(x);
2625 struct xfrm_usersa_info *p;
2626 struct xfrm_usersa_id *id;
2627 struct nlmsghdr *nlh;
2628 struct sk_buff *skb;
2629 int len = xfrm_sa_len(x);
2632 headlen = sizeof(*p);
2633 if (c->event == XFRM_MSG_DELSA) {
2634 len += nla_total_size(headlen);
2635 headlen = sizeof(*id);
2636 len += nla_total_size(sizeof(struct xfrm_mark));
2638 len += NLMSG_ALIGN(headlen);
2640 skb = nlmsg_new(len, GFP_ATOMIC);
2644 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2649 p = nlmsg_data(nlh);
2650 if (c->event == XFRM_MSG_DELSA) {
2651 struct nlattr *attr;
2653 id = nlmsg_data(nlh);
2654 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2655 id->spi = x->id.spi;
2656 id->family = x->props.family;
2657 id->proto = x->id.proto;
2659 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2666 err = copy_to_user_state_extra(x, p, skb);
2670 nlmsg_end(skb, nlh);
2672 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2679 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2683 case XFRM_MSG_EXPIRE:
2684 return xfrm_exp_state_notify(x, c);
2685 case XFRM_MSG_NEWAE:
2686 return xfrm_aevent_state_notify(x, c);
2687 case XFRM_MSG_DELSA:
2688 case XFRM_MSG_UPDSA:
2689 case XFRM_MSG_NEWSA:
2690 return xfrm_notify_sa(x, c);
2691 case XFRM_MSG_FLUSHSA:
2692 return xfrm_notify_sa_flush(c);
2694 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2703 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2704 struct xfrm_policy *xp)
2706 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2707 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2708 + nla_total_size(sizeof(struct xfrm_mark))
2709 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2710 + userpolicy_type_attrsize();
2713 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2714 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2716 __u32 seq = xfrm_get_acqseq();
2717 struct xfrm_user_acquire *ua;
2718 struct nlmsghdr *nlh;
2721 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2725 ua = nlmsg_data(nlh);
2726 memcpy(&ua->id, &x->id, sizeof(ua->id));
2727 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2728 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2729 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2730 ua->aalgos = xt->aalgos;
2731 ua->ealgos = xt->ealgos;
2732 ua->calgos = xt->calgos;
2733 ua->seq = x->km.seq = seq;
2735 err = copy_to_user_tmpl(xp, skb);
2737 err = copy_to_user_state_sec_ctx(x, skb);
2739 err = copy_to_user_policy_type(xp->type, skb);
2741 err = xfrm_mark_put(skb, &xp->mark);
2743 nlmsg_cancel(skb, nlh);
2747 nlmsg_end(skb, nlh);
2751 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2752 struct xfrm_policy *xp)
2754 struct net *net = xs_net(x);
2755 struct sk_buff *skb;
2757 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2761 if (build_acquire(skb, x, xt, xp) < 0)
2764 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2767 /* User gives us xfrm_user_policy_info followed by an array of 0
2768 * or more templates.
2770 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2771 u8 *data, int len, int *dir)
2773 struct net *net = sock_net(sk);
2774 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2775 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2776 struct xfrm_policy *xp;
2779 switch (sk->sk_family) {
2781 if (opt != IP_XFRM_POLICY) {
2786 #if IS_ENABLED(CONFIG_IPV6)
2788 if (opt != IPV6_XFRM_POLICY) {
2801 if (len < sizeof(*p) ||
2802 verify_newpolicy_info(p))
2805 nr = ((len - sizeof(*p)) / sizeof(*ut));
2806 if (validate_tmpl(nr, ut, p->sel.family))
2809 if (p->dir > XFRM_POLICY_OUT)
2812 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2818 copy_from_user_policy(xp, p);
2819 xp->type = XFRM_POLICY_TYPE_MAIN;
2820 copy_templates(xp, ut, nr);
2827 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2829 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2830 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2831 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2832 + nla_total_size(sizeof(struct xfrm_mark))
2833 + userpolicy_type_attrsize();
2836 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2837 int dir, const struct km_event *c)
2839 struct xfrm_user_polexpire *upe;
2840 int hard = c->data.hard;
2841 struct nlmsghdr *nlh;
2844 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2848 upe = nlmsg_data(nlh);
2849 copy_to_user_policy(xp, &upe->pol, dir);
2850 err = copy_to_user_tmpl(xp, skb);
2852 err = copy_to_user_sec_ctx(xp, skb);
2854 err = copy_to_user_policy_type(xp->type, skb);
2856 err = xfrm_mark_put(skb, &xp->mark);
2858 nlmsg_cancel(skb, nlh);
2863 nlmsg_end(skb, nlh);
2867 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2869 struct net *net = xp_net(xp);
2870 struct sk_buff *skb;
2872 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2876 if (build_polexpire(skb, xp, dir, c) < 0)
2879 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2882 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2884 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2885 struct net *net = xp_net(xp);
2886 struct xfrm_userpolicy_info *p;
2887 struct xfrm_userpolicy_id *id;
2888 struct nlmsghdr *nlh;
2889 struct sk_buff *skb;
2892 headlen = sizeof(*p);
2893 if (c->event == XFRM_MSG_DELPOLICY) {
2894 len += nla_total_size(headlen);
2895 headlen = sizeof(*id);
2897 len += userpolicy_type_attrsize();
2898 len += nla_total_size(sizeof(struct xfrm_mark));
2899 len += NLMSG_ALIGN(headlen);
2901 skb = nlmsg_new(len, GFP_ATOMIC);
2905 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2910 p = nlmsg_data(nlh);
2911 if (c->event == XFRM_MSG_DELPOLICY) {
2912 struct nlattr *attr;
2914 id = nlmsg_data(nlh);
2915 memset(id, 0, sizeof(*id));
2918 id->index = xp->index;
2920 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2922 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2930 copy_to_user_policy(xp, p, dir);
2931 err = copy_to_user_tmpl(xp, skb);
2933 err = copy_to_user_policy_type(xp->type, skb);
2935 err = xfrm_mark_put(skb, &xp->mark);
2939 nlmsg_end(skb, nlh);
2941 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2948 static int xfrm_notify_policy_flush(const struct km_event *c)
2950 struct net *net = c->net;
2951 struct nlmsghdr *nlh;
2952 struct sk_buff *skb;
2955 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2959 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
2963 err = copy_to_user_policy_type(c->data.type, skb);
2967 nlmsg_end(skb, nlh);
2969 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2976 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2980 case XFRM_MSG_NEWPOLICY:
2981 case XFRM_MSG_UPDPOLICY:
2982 case XFRM_MSG_DELPOLICY:
2983 return xfrm_notify_policy(xp, dir, c);
2984 case XFRM_MSG_FLUSHPOLICY:
2985 return xfrm_notify_policy_flush(c);
2986 case XFRM_MSG_POLEXPIRE:
2987 return xfrm_exp_policy_notify(xp, dir, c);
2989 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
2997 static inline size_t xfrm_report_msgsize(void)
2999 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3002 static int build_report(struct sk_buff *skb, u8 proto,
3003 struct xfrm_selector *sel, xfrm_address_t *addr)
3005 struct xfrm_user_report *ur;
3006 struct nlmsghdr *nlh;
3008 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3012 ur = nlmsg_data(nlh);
3014 memcpy(&ur->sel, sel, sizeof(ur->sel));
3017 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3019 nlmsg_cancel(skb, nlh);
3023 nlmsg_end(skb, nlh);
3027 static int xfrm_send_report(struct net *net, u8 proto,
3028 struct xfrm_selector *sel, xfrm_address_t *addr)
3030 struct sk_buff *skb;
3032 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3036 if (build_report(skb, proto, sel, addr) < 0)
3039 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3042 static inline size_t xfrm_mapping_msgsize(void)
3044 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3047 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3048 xfrm_address_t *new_saddr, __be16 new_sport)
3050 struct xfrm_user_mapping *um;
3051 struct nlmsghdr *nlh;
3053 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3057 um = nlmsg_data(nlh);
3059 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3060 um->id.spi = x->id.spi;
3061 um->id.family = x->props.family;
3062 um->id.proto = x->id.proto;
3063 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3064 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3065 um->new_sport = new_sport;
3066 um->old_sport = x->encap->encap_sport;
3067 um->reqid = x->props.reqid;
3069 nlmsg_end(skb, nlh);
3073 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3076 struct net *net = xs_net(x);
3077 struct sk_buff *skb;
3079 if (x->id.proto != IPPROTO_ESP)
3085 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3089 if (build_mapping(skb, x, ipaddr, sport) < 0)
3092 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3095 static bool xfrm_is_alive(const struct km_event *c)
3097 return (bool)xfrm_acquire_is_on(c->net);
3100 static struct xfrm_mgr netlink_mgr = {
3102 .notify = xfrm_send_state_notify,
3103 .acquire = xfrm_send_acquire,
3104 .compile_policy = xfrm_compile_policy,
3105 .notify_policy = xfrm_send_policy_notify,
3106 .report = xfrm_send_report,
3107 .migrate = xfrm_send_migrate,
3108 .new_mapping = xfrm_send_mapping,
3109 .is_alive = xfrm_is_alive,
3112 static int __net_init xfrm_user_net_init(struct net *net)
3115 struct netlink_kernel_cfg cfg = {
3116 .groups = XFRMNLGRP_MAX,
3117 .input = xfrm_netlink_rcv,
3120 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3123 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3124 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3128 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3131 list_for_each_entry(net, net_exit_list, exit_list)
3132 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3134 list_for_each_entry(net, net_exit_list, exit_list)
3135 netlink_kernel_release(net->xfrm.nlsk_stash);
3138 static struct pernet_operations xfrm_user_net_ops = {
3139 .init = xfrm_user_net_init,
3140 .exit_batch = xfrm_user_net_exit,
3143 static int __init xfrm_user_init(void)
3147 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3149 rv = register_pernet_subsys(&xfrm_user_net_ops);
3152 rv = xfrm_register_km(&netlink_mgr);
3154 unregister_pernet_subsys(&xfrm_user_net_ops);
3158 static void __exit xfrm_user_exit(void)
3160 xfrm_unregister_km(&netlink_mgr);
3161 unregister_pernet_subsys(&xfrm_user_net_ops);
3164 module_init(xfrm_user_init);
3165 module_exit(xfrm_user_exit);
3166 MODULE_LICENSE("GPL");
3167 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);