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/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>
34 #include <asm/unaligned.h>
36 static int verify_one_alg(struct nlattr **attrs, enum xfrm_attr_type_t type)
38 struct nlattr *rt = attrs[type];
39 struct xfrm_algo *algp;
45 if (nla_len(rt) < xfrm_alg_len(algp))
58 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
62 static int verify_auth_trunc(struct nlattr **attrs)
64 struct nlattr *rt = attrs[XFRMA_ALG_AUTH_TRUNC];
65 struct xfrm_algo_auth *algp;
71 if (nla_len(rt) < xfrm_alg_auth_len(algp))
74 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
78 static int verify_aead(struct nlattr **attrs)
80 struct nlattr *rt = attrs[XFRMA_ALG_AEAD];
81 struct xfrm_algo_aead *algp;
87 if (nla_len(rt) < aead_len(algp))
90 algp->alg_name[CRYPTO_MAX_ALG_NAME - 1] = '\0';
94 static void verify_one_addr(struct nlattr **attrs, enum xfrm_attr_type_t type,
95 xfrm_address_t **addrp)
97 struct nlattr *rt = attrs[type];
100 *addrp = nla_data(rt);
103 static inline int verify_sec_ctx_len(struct nlattr **attrs)
105 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
106 struct xfrm_user_sec_ctx *uctx;
112 if (uctx->len != (sizeof(struct xfrm_user_sec_ctx) + uctx->ctx_len))
118 static inline int verify_replay(struct xfrm_usersa_info *p,
119 struct nlattr **attrs)
121 struct nlattr *rt = attrs[XFRMA_REPLAY_ESN_VAL];
122 struct xfrm_replay_state_esn *rs;
124 if (p->flags & XFRM_STATE_ESN) {
130 if (rs->bmp_len > XFRMA_REPLAY_ESN_MAX / sizeof(rs->bmp[0]) / 8)
133 if (nla_len(rt) < xfrm_replay_state_esn_len(rs) &&
134 nla_len(rt) != sizeof(*rs))
141 /* As only ESP and AH support ESN feature. */
142 if ((p->id.proto != IPPROTO_ESP) && (p->id.proto != IPPROTO_AH))
145 if (p->replay_window != 0)
151 static int verify_newsa_info(struct xfrm_usersa_info *p,
152 struct nlattr **attrs)
162 #if IS_ENABLED(CONFIG_IPV6)
174 switch (p->id.proto) {
176 if ((!attrs[XFRMA_ALG_AUTH] &&
177 !attrs[XFRMA_ALG_AUTH_TRUNC]) ||
178 attrs[XFRMA_ALG_AEAD] ||
179 attrs[XFRMA_ALG_CRYPT] ||
180 attrs[XFRMA_ALG_COMP] ||
186 if (attrs[XFRMA_ALG_COMP])
188 if (!attrs[XFRMA_ALG_AUTH] &&
189 !attrs[XFRMA_ALG_AUTH_TRUNC] &&
190 !attrs[XFRMA_ALG_CRYPT] &&
191 !attrs[XFRMA_ALG_AEAD])
193 if ((attrs[XFRMA_ALG_AUTH] ||
194 attrs[XFRMA_ALG_AUTH_TRUNC] ||
195 attrs[XFRMA_ALG_CRYPT]) &&
196 attrs[XFRMA_ALG_AEAD])
198 if (attrs[XFRMA_TFCPAD] &&
199 p->mode != XFRM_MODE_TUNNEL)
204 if (!attrs[XFRMA_ALG_COMP] ||
205 attrs[XFRMA_ALG_AEAD] ||
206 attrs[XFRMA_ALG_AUTH] ||
207 attrs[XFRMA_ALG_AUTH_TRUNC] ||
208 attrs[XFRMA_ALG_CRYPT] ||
209 attrs[XFRMA_TFCPAD] ||
210 (ntohl(p->id.spi) >= 0x10000))
214 #if IS_ENABLED(CONFIG_IPV6)
215 case IPPROTO_DSTOPTS:
216 case IPPROTO_ROUTING:
217 if (attrs[XFRMA_ALG_COMP] ||
218 attrs[XFRMA_ALG_AUTH] ||
219 attrs[XFRMA_ALG_AUTH_TRUNC] ||
220 attrs[XFRMA_ALG_AEAD] ||
221 attrs[XFRMA_ALG_CRYPT] ||
222 attrs[XFRMA_ENCAP] ||
223 attrs[XFRMA_SEC_CTX] ||
224 attrs[XFRMA_TFCPAD] ||
225 !attrs[XFRMA_COADDR])
234 if ((err = verify_aead(attrs)))
236 if ((err = verify_auth_trunc(attrs)))
238 if ((err = verify_one_alg(attrs, XFRMA_ALG_AUTH)))
240 if ((err = verify_one_alg(attrs, XFRMA_ALG_CRYPT)))
242 if ((err = verify_one_alg(attrs, XFRMA_ALG_COMP)))
244 if ((err = verify_sec_ctx_len(attrs)))
246 if ((err = verify_replay(p, attrs)))
251 case XFRM_MODE_TRANSPORT:
252 case XFRM_MODE_TUNNEL:
253 case XFRM_MODE_ROUTEOPTIMIZATION:
267 static int attach_one_algo(struct xfrm_algo **algpp, u8 *props,
268 struct xfrm_algo_desc *(*get_byname)(const char *, int),
271 struct xfrm_algo *p, *ualg;
272 struct xfrm_algo_desc *algo;
277 ualg = nla_data(rta);
279 algo = get_byname(ualg->alg_name, 1);
282 *props = algo->desc.sadb_alg_id;
284 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
288 strcpy(p->alg_name, algo->name);
293 static int attach_crypt(struct xfrm_state *x, struct nlattr *rta)
295 struct xfrm_algo *p, *ualg;
296 struct xfrm_algo_desc *algo;
301 ualg = nla_data(rta);
303 algo = xfrm_ealg_get_byname(ualg->alg_name, 1);
306 x->props.ealgo = algo->desc.sadb_alg_id;
308 p = kmemdup(ualg, xfrm_alg_len(ualg), GFP_KERNEL);
312 strcpy(p->alg_name, algo->name);
314 x->geniv = algo->uinfo.encr.geniv;
318 static int attach_auth(struct xfrm_algo_auth **algpp, u8 *props,
321 struct xfrm_algo *ualg;
322 struct xfrm_algo_auth *p;
323 struct xfrm_algo_desc *algo;
328 ualg = nla_data(rta);
330 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
333 *props = algo->desc.sadb_alg_id;
335 p = kmalloc(sizeof(*p) + (ualg->alg_key_len + 7) / 8, GFP_KERNEL);
339 strcpy(p->alg_name, algo->name);
340 p->alg_key_len = ualg->alg_key_len;
341 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
342 memcpy(p->alg_key, ualg->alg_key, (ualg->alg_key_len + 7) / 8);
348 static int attach_auth_trunc(struct xfrm_algo_auth **algpp, u8 *props,
351 struct xfrm_algo_auth *p, *ualg;
352 struct xfrm_algo_desc *algo;
357 ualg = nla_data(rta);
359 algo = xfrm_aalg_get_byname(ualg->alg_name, 1);
362 if (ualg->alg_trunc_len > algo->uinfo.auth.icv_fullbits)
364 *props = algo->desc.sadb_alg_id;
366 p = kmemdup(ualg, xfrm_alg_auth_len(ualg), GFP_KERNEL);
370 strcpy(p->alg_name, algo->name);
371 if (!p->alg_trunc_len)
372 p->alg_trunc_len = algo->uinfo.auth.icv_truncbits;
378 static int attach_aead(struct xfrm_state *x, struct nlattr *rta)
380 struct xfrm_algo_aead *p, *ualg;
381 struct xfrm_algo_desc *algo;
386 ualg = nla_data(rta);
388 algo = xfrm_aead_get_byname(ualg->alg_name, ualg->alg_icv_len, 1);
391 x->props.ealgo = algo->desc.sadb_alg_id;
393 p = kmemdup(ualg, aead_len(ualg), GFP_KERNEL);
397 strcpy(p->alg_name, algo->name);
399 x->geniv = algo->uinfo.aead.geniv;
403 static inline int xfrm_replay_verify_len(struct xfrm_replay_state_esn *replay_esn,
406 struct xfrm_replay_state_esn *up;
409 if (!replay_esn || !rp)
413 ulen = xfrm_replay_state_esn_len(up);
415 /* Check the overall length and the internal bitmap length to avoid
416 * potential overflow. */
417 if (nla_len(rp) < ulen ||
418 xfrm_replay_state_esn_len(replay_esn) != ulen ||
419 replay_esn->bmp_len != up->bmp_len)
422 if (up->replay_window > up->bmp_len * sizeof(__u32) * 8)
428 static int xfrm_alloc_replay_state_esn(struct xfrm_replay_state_esn **replay_esn,
429 struct xfrm_replay_state_esn **preplay_esn,
432 struct xfrm_replay_state_esn *p, *pp, *up;
439 klen = xfrm_replay_state_esn_len(up);
440 ulen = nla_len(rta) >= klen ? klen : sizeof(*up);
442 p = kzalloc(klen, GFP_KERNEL);
446 pp = kzalloc(klen, GFP_KERNEL);
453 memcpy(pp, up, ulen);
461 static inline int xfrm_user_sec_ctx_size(struct xfrm_sec_ctx *xfrm_ctx)
466 len += sizeof(struct xfrm_user_sec_ctx);
467 len += xfrm_ctx->ctx_len;
472 static void copy_from_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
474 memcpy(&x->id, &p->id, sizeof(x->id));
475 memcpy(&x->sel, &p->sel, sizeof(x->sel));
476 memcpy(&x->lft, &p->lft, sizeof(x->lft));
477 x->props.mode = p->mode;
478 x->props.replay_window = min_t(unsigned int, p->replay_window,
479 sizeof(x->replay.bitmap) * 8);
480 x->props.reqid = p->reqid;
481 x->props.family = p->family;
482 memcpy(&x->props.saddr, &p->saddr, sizeof(x->props.saddr));
483 x->props.flags = p->flags;
485 if (!x->sel.family && !(p->flags & XFRM_STATE_AF_UNSPEC))
486 x->sel.family = p->family;
490 * someday when pfkey also has support, we could have the code
491 * somehow made shareable and move it to xfrm_state.c - JHS
494 static void xfrm_update_ae_params(struct xfrm_state *x, struct nlattr **attrs,
497 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
498 struct nlattr *re = update_esn ? attrs[XFRMA_REPLAY_ESN_VAL] : NULL;
499 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
500 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
501 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
504 struct xfrm_replay_state_esn *replay_esn;
505 replay_esn = nla_data(re);
506 memcpy(x->replay_esn, replay_esn,
507 xfrm_replay_state_esn_len(replay_esn));
508 memcpy(x->preplay_esn, replay_esn,
509 xfrm_replay_state_esn_len(replay_esn));
513 struct xfrm_replay_state *replay;
514 replay = nla_data(rp);
515 memcpy(&x->replay, replay, sizeof(*replay));
516 memcpy(&x->preplay, replay, sizeof(*replay));
520 struct xfrm_lifetime_cur *ltime;
521 ltime = nla_data(lt);
522 x->curlft.bytes = ltime->bytes;
523 x->curlft.packets = ltime->packets;
524 x->curlft.add_time = ltime->add_time;
525 x->curlft.use_time = ltime->use_time;
529 x->replay_maxage = nla_get_u32(et);
532 x->replay_maxdiff = nla_get_u32(rt);
535 static struct xfrm_state *xfrm_state_construct(struct net *net,
536 struct xfrm_usersa_info *p,
537 struct nlattr **attrs,
540 struct xfrm_state *x = xfrm_state_alloc(net);
546 copy_from_user_state(x, p);
548 if (attrs[XFRMA_SA_EXTRA_FLAGS])
549 x->props.extra_flags = nla_get_u32(attrs[XFRMA_SA_EXTRA_FLAGS]);
551 if ((err = attach_aead(x, attrs[XFRMA_ALG_AEAD])))
553 if ((err = attach_auth_trunc(&x->aalg, &x->props.aalgo,
554 attrs[XFRMA_ALG_AUTH_TRUNC])))
556 if (!x->props.aalgo) {
557 if ((err = attach_auth(&x->aalg, &x->props.aalgo,
558 attrs[XFRMA_ALG_AUTH])))
561 if ((err = attach_crypt(x, attrs[XFRMA_ALG_CRYPT])))
563 if ((err = attach_one_algo(&x->calg, &x->props.calgo,
564 xfrm_calg_get_byname,
565 attrs[XFRMA_ALG_COMP])))
568 if (attrs[XFRMA_ENCAP]) {
569 x->encap = kmemdup(nla_data(attrs[XFRMA_ENCAP]),
570 sizeof(*x->encap), GFP_KERNEL);
571 if (x->encap == NULL)
575 if (attrs[XFRMA_TFCPAD])
576 x->tfcpad = nla_get_u32(attrs[XFRMA_TFCPAD]);
578 if (attrs[XFRMA_COADDR]) {
579 x->coaddr = kmemdup(nla_data(attrs[XFRMA_COADDR]),
580 sizeof(*x->coaddr), GFP_KERNEL);
581 if (x->coaddr == NULL)
585 xfrm_mark_get(attrs, &x->mark);
587 err = __xfrm_init_state(x, false);
591 if (attrs[XFRMA_SEC_CTX] &&
592 security_xfrm_state_alloc(x, nla_data(attrs[XFRMA_SEC_CTX])))
595 if ((err = xfrm_alloc_replay_state_esn(&x->replay_esn, &x->preplay_esn,
596 attrs[XFRMA_REPLAY_ESN_VAL])))
600 x->replay_maxdiff = net->xfrm.sysctl_aevent_rseqth;
601 /* sysctl_xfrm_aevent_etime is in 100ms units */
602 x->replay_maxage = (net->xfrm.sysctl_aevent_etime*HZ)/XFRM_AE_ETH_M;
604 if ((err = xfrm_init_replay(x)))
607 /* override default values from above */
608 xfrm_update_ae_params(x, attrs, 0);
613 x->km.state = XFRM_STATE_DEAD;
620 static int xfrm_add_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
621 struct nlattr **attrs)
623 struct net *net = sock_net(skb->sk);
624 struct xfrm_usersa_info *p = nlmsg_data(nlh);
625 struct xfrm_state *x;
629 err = verify_newsa_info(p, attrs);
633 x = xfrm_state_construct(net, p, attrs, &err);
638 if (nlh->nlmsg_type == XFRM_MSG_NEWSA)
639 err = xfrm_state_add(x);
641 err = xfrm_state_update(x);
643 xfrm_audit_state_add(x, err ? 0 : 1, true);
646 x->km.state = XFRM_STATE_DEAD;
651 c.seq = nlh->nlmsg_seq;
652 c.portid = nlh->nlmsg_pid;
653 c.event = nlh->nlmsg_type;
655 km_state_notify(x, &c);
661 static struct xfrm_state *xfrm_user_state_lookup(struct net *net,
662 struct xfrm_usersa_id *p,
663 struct nlattr **attrs,
666 struct xfrm_state *x = NULL;
669 u32 mark = xfrm_mark_get(attrs, &m);
671 if (xfrm_id_proto_match(p->proto, IPSEC_PROTO_ANY)) {
673 x = xfrm_state_lookup(net, mark, &p->daddr, p->spi, p->proto, p->family);
675 xfrm_address_t *saddr = NULL;
677 verify_one_addr(attrs, XFRMA_SRCADDR, &saddr);
684 x = xfrm_state_lookup_byaddr(net, mark,
686 p->proto, p->family);
695 static int xfrm_del_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
696 struct nlattr **attrs)
698 struct net *net = sock_net(skb->sk);
699 struct xfrm_state *x;
702 struct xfrm_usersa_id *p = nlmsg_data(nlh);
704 x = xfrm_user_state_lookup(net, p, attrs, &err);
708 if ((err = security_xfrm_state_delete(x)) != 0)
711 if (xfrm_state_kern(x)) {
716 err = xfrm_state_delete(x);
721 c.seq = nlh->nlmsg_seq;
722 c.portid = nlh->nlmsg_pid;
723 c.event = nlh->nlmsg_type;
724 km_state_notify(x, &c);
727 xfrm_audit_state_delete(x, err ? 0 : 1, true);
732 static void copy_to_user_state(struct xfrm_state *x, struct xfrm_usersa_info *p)
734 memset(p, 0, sizeof(*p));
735 memcpy(&p->id, &x->id, sizeof(p->id));
736 memcpy(&p->sel, &x->sel, sizeof(p->sel));
737 memcpy(&p->lft, &x->lft, sizeof(p->lft));
738 memcpy(&p->curlft, &x->curlft, sizeof(p->curlft));
739 put_unaligned(x->stats.replay_window, &p->stats.replay_window);
740 put_unaligned(x->stats.replay, &p->stats.replay);
741 put_unaligned(x->stats.integrity_failed, &p->stats.integrity_failed);
742 memcpy(&p->saddr, &x->props.saddr, sizeof(p->saddr));
743 p->mode = x->props.mode;
744 p->replay_window = x->props.replay_window;
745 p->reqid = x->props.reqid;
746 p->family = x->props.family;
747 p->flags = x->props.flags;
751 struct xfrm_dump_info {
752 struct sk_buff *in_skb;
753 struct sk_buff *out_skb;
758 static int copy_sec_ctx(struct xfrm_sec_ctx *s, struct sk_buff *skb)
760 struct xfrm_user_sec_ctx *uctx;
762 int ctx_size = sizeof(*uctx) + s->ctx_len;
764 attr = nla_reserve(skb, XFRMA_SEC_CTX, ctx_size);
768 uctx = nla_data(attr);
769 uctx->exttype = XFRMA_SEC_CTX;
770 uctx->len = ctx_size;
771 uctx->ctx_doi = s->ctx_doi;
772 uctx->ctx_alg = s->ctx_alg;
773 uctx->ctx_len = s->ctx_len;
774 memcpy(uctx + 1, s->ctx_str, s->ctx_len);
779 static int copy_to_user_auth(struct xfrm_algo_auth *auth, struct sk_buff *skb)
781 struct xfrm_algo *algo;
784 nla = nla_reserve(skb, XFRMA_ALG_AUTH,
785 sizeof(*algo) + (auth->alg_key_len + 7) / 8);
789 algo = nla_data(nla);
790 strncpy(algo->alg_name, auth->alg_name, sizeof(algo->alg_name));
791 memcpy(algo->alg_key, auth->alg_key, (auth->alg_key_len + 7) / 8);
792 algo->alg_key_len = auth->alg_key_len;
797 /* Don't change this without updating xfrm_sa_len! */
798 static int copy_to_user_state_extra(struct xfrm_state *x,
799 struct xfrm_usersa_info *p,
804 copy_to_user_state(x, p);
806 if (x->props.extra_flags) {
807 ret = nla_put_u32(skb, XFRMA_SA_EXTRA_FLAGS,
808 x->props.extra_flags);
814 ret = nla_put(skb, XFRMA_COADDR, sizeof(*x->coaddr), x->coaddr);
819 ret = nla_put_u64(skb, XFRMA_LASTUSED, x->lastused);
824 ret = nla_put(skb, XFRMA_ALG_AEAD, aead_len(x->aead), x->aead);
829 ret = copy_to_user_auth(x->aalg, skb);
831 ret = nla_put(skb, XFRMA_ALG_AUTH_TRUNC,
832 xfrm_alg_auth_len(x->aalg), x->aalg);
837 ret = nla_put(skb, XFRMA_ALG_CRYPT, xfrm_alg_len(x->ealg), x->ealg);
842 ret = nla_put(skb, XFRMA_ALG_COMP, sizeof(*(x->calg)), x->calg);
847 ret = nla_put(skb, XFRMA_ENCAP, sizeof(*x->encap), x->encap);
852 ret = nla_put_u32(skb, XFRMA_TFCPAD, x->tfcpad);
856 ret = xfrm_mark_put(skb, &x->mark);
860 ret = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
861 xfrm_replay_state_esn_len(x->replay_esn),
864 ret = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
869 ret = copy_sec_ctx(x->security, skb);
874 static int dump_one_state(struct xfrm_state *x, int count, void *ptr)
876 struct xfrm_dump_info *sp = ptr;
877 struct sk_buff *in_skb = sp->in_skb;
878 struct sk_buff *skb = sp->out_skb;
879 struct xfrm_usersa_info *p;
880 struct nlmsghdr *nlh;
883 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
884 XFRM_MSG_NEWSA, sizeof(*p), sp->nlmsg_flags);
890 err = copy_to_user_state_extra(x, p, skb);
892 nlmsg_cancel(skb, nlh);
899 static int xfrm_dump_sa_done(struct netlink_callback *cb)
901 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
902 struct sock *sk = cb->skb->sk;
903 struct net *net = sock_net(sk);
905 xfrm_state_walk_done(walk, net);
909 static const struct nla_policy xfrma_policy[XFRMA_MAX+1];
910 static int xfrm_dump_sa(struct sk_buff *skb, struct netlink_callback *cb)
912 struct net *net = sock_net(skb->sk);
913 struct xfrm_state_walk *walk = (struct xfrm_state_walk *) &cb->args[1];
914 struct xfrm_dump_info info;
916 BUILD_BUG_ON(sizeof(struct xfrm_state_walk) >
917 sizeof(cb->args) - sizeof(cb->args[0]));
919 info.in_skb = cb->skb;
921 info.nlmsg_seq = cb->nlh->nlmsg_seq;
922 info.nlmsg_flags = NLM_F_MULTI;
925 struct nlattr *attrs[XFRMA_MAX+1];
926 struct xfrm_address_filter *filter = NULL;
932 err = nlmsg_parse(cb->nlh, 0, attrs, XFRMA_MAX,
937 if (attrs[XFRMA_ADDRESS_FILTER]) {
938 filter = kmemdup(nla_data(attrs[XFRMA_ADDRESS_FILTER]),
939 sizeof(*filter), GFP_KERNEL);
944 if (attrs[XFRMA_PROTO])
945 proto = nla_get_u8(attrs[XFRMA_PROTO]);
947 xfrm_state_walk_init(walk, proto, filter);
950 (void) xfrm_state_walk(net, walk, dump_one_state, &info);
955 static struct sk_buff *xfrm_state_netlink(struct sk_buff *in_skb,
956 struct xfrm_state *x, u32 seq)
958 struct xfrm_dump_info info;
962 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
964 return ERR_PTR(-ENOMEM);
966 info.in_skb = in_skb;
968 info.nlmsg_seq = seq;
969 info.nlmsg_flags = 0;
971 err = dump_one_state(x, 0, &info);
980 /* A wrapper for nlmsg_multicast() checking that nlsk is still available.
981 * Must be called with RCU read lock.
983 static inline int xfrm_nlmsg_multicast(struct net *net, struct sk_buff *skb,
984 u32 pid, unsigned int group)
986 struct sock *nlsk = rcu_dereference(net->xfrm.nlsk);
989 return nlmsg_multicast(nlsk, skb, pid, group, GFP_ATOMIC);
994 static inline size_t xfrm_spdinfo_msgsize(void)
996 return NLMSG_ALIGN(4)
997 + nla_total_size(sizeof(struct xfrmu_spdinfo))
998 + nla_total_size(sizeof(struct xfrmu_spdhinfo))
999 + nla_total_size(sizeof(struct xfrmu_spdhthresh))
1000 + nla_total_size(sizeof(struct xfrmu_spdhthresh));
1003 static int build_spdinfo(struct sk_buff *skb, struct net *net,
1004 u32 portid, u32 seq, u32 flags)
1006 struct xfrmk_spdinfo si;
1007 struct xfrmu_spdinfo spc;
1008 struct xfrmu_spdhinfo sph;
1009 struct xfrmu_spdhthresh spt4, spt6;
1010 struct nlmsghdr *nlh;
1015 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSPDINFO, sizeof(u32), 0);
1016 if (nlh == NULL) /* shouldn't really happen ... */
1019 f = nlmsg_data(nlh);
1021 xfrm_spd_getinfo(net, &si);
1022 spc.incnt = si.incnt;
1023 spc.outcnt = si.outcnt;
1024 spc.fwdcnt = si.fwdcnt;
1025 spc.inscnt = si.inscnt;
1026 spc.outscnt = si.outscnt;
1027 spc.fwdscnt = si.fwdscnt;
1028 sph.spdhcnt = si.spdhcnt;
1029 sph.spdhmcnt = si.spdhmcnt;
1032 lseq = read_seqbegin(&net->xfrm.policy_hthresh.lock);
1034 spt4.lbits = net->xfrm.policy_hthresh.lbits4;
1035 spt4.rbits = net->xfrm.policy_hthresh.rbits4;
1036 spt6.lbits = net->xfrm.policy_hthresh.lbits6;
1037 spt6.rbits = net->xfrm.policy_hthresh.rbits6;
1038 } while (read_seqretry(&net->xfrm.policy_hthresh.lock, lseq));
1040 err = nla_put(skb, XFRMA_SPD_INFO, sizeof(spc), &spc);
1042 err = nla_put(skb, XFRMA_SPD_HINFO, sizeof(sph), &sph);
1044 err = nla_put(skb, XFRMA_SPD_IPV4_HTHRESH, sizeof(spt4), &spt4);
1046 err = nla_put(skb, XFRMA_SPD_IPV6_HTHRESH, sizeof(spt6), &spt6);
1048 nlmsg_cancel(skb, nlh);
1052 nlmsg_end(skb, nlh);
1056 static int xfrm_set_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1057 struct nlattr **attrs)
1059 struct net *net = sock_net(skb->sk);
1060 struct xfrmu_spdhthresh *thresh4 = NULL;
1061 struct xfrmu_spdhthresh *thresh6 = NULL;
1063 /* selector prefixlen thresholds to hash policies */
1064 if (attrs[XFRMA_SPD_IPV4_HTHRESH]) {
1065 struct nlattr *rta = attrs[XFRMA_SPD_IPV4_HTHRESH];
1067 if (nla_len(rta) < sizeof(*thresh4))
1069 thresh4 = nla_data(rta);
1070 if (thresh4->lbits > 32 || thresh4->rbits > 32)
1073 if (attrs[XFRMA_SPD_IPV6_HTHRESH]) {
1074 struct nlattr *rta = attrs[XFRMA_SPD_IPV6_HTHRESH];
1076 if (nla_len(rta) < sizeof(*thresh6))
1078 thresh6 = nla_data(rta);
1079 if (thresh6->lbits > 128 || thresh6->rbits > 128)
1083 if (thresh4 || thresh6) {
1084 write_seqlock(&net->xfrm.policy_hthresh.lock);
1086 net->xfrm.policy_hthresh.lbits4 = thresh4->lbits;
1087 net->xfrm.policy_hthresh.rbits4 = thresh4->rbits;
1090 net->xfrm.policy_hthresh.lbits6 = thresh6->lbits;
1091 net->xfrm.policy_hthresh.rbits6 = thresh6->rbits;
1093 write_sequnlock(&net->xfrm.policy_hthresh.lock);
1095 xfrm_policy_hash_rebuild(net);
1101 static int xfrm_get_spdinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1102 struct nlattr **attrs)
1104 struct net *net = sock_net(skb->sk);
1105 struct sk_buff *r_skb;
1106 u32 *flags = nlmsg_data(nlh);
1107 u32 sportid = NETLINK_CB(skb).portid;
1108 u32 seq = nlh->nlmsg_seq;
1110 r_skb = nlmsg_new(xfrm_spdinfo_msgsize(), GFP_ATOMIC);
1114 if (build_spdinfo(r_skb, net, sportid, seq, *flags) < 0)
1117 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1120 static inline size_t xfrm_sadinfo_msgsize(void)
1122 return NLMSG_ALIGN(4)
1123 + nla_total_size(sizeof(struct xfrmu_sadhinfo))
1124 + nla_total_size(4); /* XFRMA_SAD_CNT */
1127 static int build_sadinfo(struct sk_buff *skb, struct net *net,
1128 u32 portid, u32 seq, u32 flags)
1130 struct xfrmk_sadinfo si;
1131 struct xfrmu_sadhinfo sh;
1132 struct nlmsghdr *nlh;
1136 nlh = nlmsg_put(skb, portid, seq, XFRM_MSG_NEWSADINFO, sizeof(u32), 0);
1137 if (nlh == NULL) /* shouldn't really happen ... */
1140 f = nlmsg_data(nlh);
1142 xfrm_sad_getinfo(net, &si);
1144 sh.sadhmcnt = si.sadhmcnt;
1145 sh.sadhcnt = si.sadhcnt;
1147 err = nla_put_u32(skb, XFRMA_SAD_CNT, si.sadcnt);
1149 err = nla_put(skb, XFRMA_SAD_HINFO, sizeof(sh), &sh);
1151 nlmsg_cancel(skb, nlh);
1155 nlmsg_end(skb, nlh);
1159 static int xfrm_get_sadinfo(struct sk_buff *skb, struct nlmsghdr *nlh,
1160 struct nlattr **attrs)
1162 struct net *net = sock_net(skb->sk);
1163 struct sk_buff *r_skb;
1164 u32 *flags = nlmsg_data(nlh);
1165 u32 sportid = NETLINK_CB(skb).portid;
1166 u32 seq = nlh->nlmsg_seq;
1168 r_skb = nlmsg_new(xfrm_sadinfo_msgsize(), GFP_ATOMIC);
1172 if (build_sadinfo(r_skb, net, sportid, seq, *flags) < 0)
1175 return nlmsg_unicast(net->xfrm.nlsk, r_skb, sportid);
1178 static int xfrm_get_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1179 struct nlattr **attrs)
1181 struct net *net = sock_net(skb->sk);
1182 struct xfrm_usersa_id *p = nlmsg_data(nlh);
1183 struct xfrm_state *x;
1184 struct sk_buff *resp_skb;
1187 x = xfrm_user_state_lookup(net, p, attrs, &err);
1191 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1192 if (IS_ERR(resp_skb)) {
1193 err = PTR_ERR(resp_skb);
1195 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1202 static int xfrm_alloc_userspi(struct sk_buff *skb, struct nlmsghdr *nlh,
1203 struct nlattr **attrs)
1205 struct net *net = sock_net(skb->sk);
1206 struct xfrm_state *x;
1207 struct xfrm_userspi_info *p;
1208 struct sk_buff *resp_skb;
1209 xfrm_address_t *daddr;
1215 p = nlmsg_data(nlh);
1216 err = verify_spi_info(p->info.id.proto, p->min, p->max);
1220 family = p->info.family;
1221 daddr = &p->info.id.daddr;
1225 mark = xfrm_mark_get(attrs, &m);
1227 x = xfrm_find_acq_byseq(net, mark, p->info.seq);
1228 if (x && !xfrm_addr_equal(&x->id.daddr, daddr, family)) {
1235 x = xfrm_find_acq(net, &m, p->info.mode, p->info.reqid,
1236 p->info.id.proto, daddr,
1243 err = xfrm_alloc_spi(x, p->min, p->max);
1247 resp_skb = xfrm_state_netlink(skb, x, nlh->nlmsg_seq);
1248 if (IS_ERR(resp_skb)) {
1249 err = PTR_ERR(resp_skb);
1253 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb, NETLINK_CB(skb).portid);
1261 static int verify_policy_dir(u8 dir)
1264 case XFRM_POLICY_IN:
1265 case XFRM_POLICY_OUT:
1266 case XFRM_POLICY_FWD:
1276 static int verify_policy_type(u8 type)
1279 case XFRM_POLICY_TYPE_MAIN:
1280 #ifdef CONFIG_XFRM_SUB_POLICY
1281 case XFRM_POLICY_TYPE_SUB:
1292 static int verify_newpolicy_info(struct xfrm_userpolicy_info *p)
1297 case XFRM_SHARE_ANY:
1298 case XFRM_SHARE_SESSION:
1299 case XFRM_SHARE_USER:
1300 case XFRM_SHARE_UNIQUE:
1307 switch (p->action) {
1308 case XFRM_POLICY_ALLOW:
1309 case XFRM_POLICY_BLOCK:
1316 switch (p->sel.family) {
1321 #if IS_ENABLED(CONFIG_IPV6)
1324 return -EAFNOSUPPORT;
1331 ret = verify_policy_dir(p->dir);
1334 if (p->index && ((p->index & XFRM_POLICY_MAX) != p->dir))
1340 static int copy_from_user_sec_ctx(struct xfrm_policy *pol, struct nlattr **attrs)
1342 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1343 struct xfrm_user_sec_ctx *uctx;
1348 uctx = nla_data(rt);
1349 return security_xfrm_policy_alloc(&pol->security, uctx, GFP_KERNEL);
1352 static void copy_templates(struct xfrm_policy *xp, struct xfrm_user_tmpl *ut,
1358 for (i = 0; i < nr; i++, ut++) {
1359 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
1361 memcpy(&t->id, &ut->id, sizeof(struct xfrm_id));
1362 memcpy(&t->saddr, &ut->saddr,
1363 sizeof(xfrm_address_t));
1364 t->reqid = ut->reqid;
1366 t->share = ut->share;
1367 t->optional = ut->optional;
1368 t->aalgos = ut->aalgos;
1369 t->ealgos = ut->ealgos;
1370 t->calgos = ut->calgos;
1371 /* If all masks are ~0, then we allow all algorithms. */
1372 t->allalgs = !~(t->aalgos & t->ealgos & t->calgos);
1373 t->encap_family = ut->family;
1377 static int validate_tmpl(int nr, struct xfrm_user_tmpl *ut, u16 family)
1382 if (nr > XFRM_MAX_DEPTH)
1385 prev_family = family;
1387 for (i = 0; i < nr; i++) {
1388 /* We never validated the ut->family value, so many
1389 * applications simply leave it at zero. The check was
1390 * never made and ut->family was ignored because all
1391 * templates could be assumed to have the same family as
1392 * the policy itself. Now that we will have ipv4-in-ipv6
1393 * and ipv6-in-ipv4 tunnels, this is no longer true.
1396 ut[i].family = family;
1398 if ((ut[i].mode == XFRM_MODE_TRANSPORT) &&
1399 (ut[i].family != prev_family))
1402 prev_family = ut[i].family;
1404 switch (ut[i].family) {
1407 #if IS_ENABLED(CONFIG_IPV6)
1415 switch (ut[i].id.proto) {
1419 #if IS_ENABLED(CONFIG_IPV6)
1420 case IPPROTO_ROUTING:
1421 case IPPROTO_DSTOPTS:
1423 case IPSEC_PROTO_ANY:
1434 static int copy_from_user_tmpl(struct xfrm_policy *pol, struct nlattr **attrs)
1436 struct nlattr *rt = attrs[XFRMA_TMPL];
1441 struct xfrm_user_tmpl *utmpl = nla_data(rt);
1442 int nr = nla_len(rt) / sizeof(*utmpl);
1445 err = validate_tmpl(nr, utmpl, pol->family);
1449 copy_templates(pol, utmpl, nr);
1454 static int copy_from_user_policy_type(u8 *tp, struct nlattr **attrs)
1456 struct nlattr *rt = attrs[XFRMA_POLICY_TYPE];
1457 struct xfrm_userpolicy_type *upt;
1458 u8 type = XFRM_POLICY_TYPE_MAIN;
1466 err = verify_policy_type(type);
1474 static void copy_from_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p)
1476 xp->priority = p->priority;
1477 xp->index = p->index;
1478 memcpy(&xp->selector, &p->sel, sizeof(xp->selector));
1479 memcpy(&xp->lft, &p->lft, sizeof(xp->lft));
1480 xp->action = p->action;
1481 xp->flags = p->flags;
1482 xp->family = p->sel.family;
1483 /* XXX xp->share = p->share; */
1486 static void copy_to_user_policy(struct xfrm_policy *xp, struct xfrm_userpolicy_info *p, int dir)
1488 memset(p, 0, sizeof(*p));
1489 memcpy(&p->sel, &xp->selector, sizeof(p->sel));
1490 memcpy(&p->lft, &xp->lft, sizeof(p->lft));
1491 memcpy(&p->curlft, &xp->curlft, sizeof(p->curlft));
1492 p->priority = xp->priority;
1493 p->index = xp->index;
1494 p->sel.family = xp->family;
1496 p->action = xp->action;
1497 p->flags = xp->flags;
1498 p->share = XFRM_SHARE_ANY; /* XXX xp->share */
1501 static struct xfrm_policy *xfrm_policy_construct(struct net *net, struct xfrm_userpolicy_info *p, struct nlattr **attrs, int *errp)
1503 struct xfrm_policy *xp = xfrm_policy_alloc(net, GFP_KERNEL);
1511 copy_from_user_policy(xp, p);
1513 err = copy_from_user_policy_type(&xp->type, attrs);
1517 if (!(err = copy_from_user_tmpl(xp, attrs)))
1518 err = copy_from_user_sec_ctx(xp, attrs);
1522 xfrm_mark_get(attrs, &xp->mark);
1528 xfrm_policy_destroy(xp);
1532 static int xfrm_add_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1533 struct nlattr **attrs)
1535 struct net *net = sock_net(skb->sk);
1536 struct xfrm_userpolicy_info *p = nlmsg_data(nlh);
1537 struct xfrm_policy *xp;
1542 err = verify_newpolicy_info(p);
1545 err = verify_sec_ctx_len(attrs);
1549 xp = xfrm_policy_construct(net, p, attrs, &err);
1553 /* shouldn't excl be based on nlh flags??
1554 * Aha! this is anti-netlink really i.e more pfkey derived
1555 * in netlink excl is a flag and you wouldnt need
1556 * a type XFRM_MSG_UPDPOLICY - JHS */
1557 excl = nlh->nlmsg_type == XFRM_MSG_NEWPOLICY;
1558 err = xfrm_policy_insert(p->dir, xp, excl);
1559 xfrm_audit_policy_add(xp, err ? 0 : 1, true);
1562 security_xfrm_policy_free(xp->security);
1567 c.event = nlh->nlmsg_type;
1568 c.seq = nlh->nlmsg_seq;
1569 c.portid = nlh->nlmsg_pid;
1570 km_policy_notify(xp, p->dir, &c);
1577 static int copy_to_user_tmpl(struct xfrm_policy *xp, struct sk_buff *skb)
1579 struct xfrm_user_tmpl vec[XFRM_MAX_DEPTH];
1582 if (xp->xfrm_nr == 0)
1585 for (i = 0; i < xp->xfrm_nr; i++) {
1586 struct xfrm_user_tmpl *up = &vec[i];
1587 struct xfrm_tmpl *kp = &xp->xfrm_vec[i];
1589 memset(up, 0, sizeof(*up));
1590 memcpy(&up->id, &kp->id, sizeof(up->id));
1591 up->family = kp->encap_family;
1592 memcpy(&up->saddr, &kp->saddr, sizeof(up->saddr));
1593 up->reqid = kp->reqid;
1594 up->mode = kp->mode;
1595 up->share = kp->share;
1596 up->optional = kp->optional;
1597 up->aalgos = kp->aalgos;
1598 up->ealgos = kp->ealgos;
1599 up->calgos = kp->calgos;
1602 return nla_put(skb, XFRMA_TMPL,
1603 sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr, vec);
1606 static inline int copy_to_user_state_sec_ctx(struct xfrm_state *x, struct sk_buff *skb)
1609 return copy_sec_ctx(x->security, skb);
1614 static inline int copy_to_user_sec_ctx(struct xfrm_policy *xp, struct sk_buff *skb)
1617 return copy_sec_ctx(xp->security, skb);
1620 static inline size_t userpolicy_type_attrsize(void)
1622 #ifdef CONFIG_XFRM_SUB_POLICY
1623 return nla_total_size(sizeof(struct xfrm_userpolicy_type));
1629 #ifdef CONFIG_XFRM_SUB_POLICY
1630 static int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1632 struct xfrm_userpolicy_type upt = {
1636 return nla_put(skb, XFRMA_POLICY_TYPE, sizeof(upt), &upt);
1640 static inline int copy_to_user_policy_type(u8 type, struct sk_buff *skb)
1646 static int dump_one_policy(struct xfrm_policy *xp, int dir, int count, void *ptr)
1648 struct xfrm_dump_info *sp = ptr;
1649 struct xfrm_userpolicy_info *p;
1650 struct sk_buff *in_skb = sp->in_skb;
1651 struct sk_buff *skb = sp->out_skb;
1652 struct nlmsghdr *nlh;
1655 nlh = nlmsg_put(skb, NETLINK_CB(in_skb).portid, sp->nlmsg_seq,
1656 XFRM_MSG_NEWPOLICY, sizeof(*p), sp->nlmsg_flags);
1660 p = nlmsg_data(nlh);
1661 copy_to_user_policy(xp, p, dir);
1662 err = copy_to_user_tmpl(xp, skb);
1664 err = copy_to_user_sec_ctx(xp, skb);
1666 err = copy_to_user_policy_type(xp->type, skb);
1668 err = xfrm_mark_put(skb, &xp->mark);
1670 nlmsg_cancel(skb, nlh);
1673 nlmsg_end(skb, nlh);
1677 static int xfrm_dump_policy_done(struct netlink_callback *cb)
1679 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1680 struct net *net = sock_net(cb->skb->sk);
1682 xfrm_policy_walk_done(walk, net);
1686 static int xfrm_dump_policy_start(struct netlink_callback *cb)
1688 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1690 BUILD_BUG_ON(sizeof(*walk) > sizeof(cb->args));
1692 xfrm_policy_walk_init(walk, XFRM_POLICY_TYPE_ANY);
1696 static int xfrm_dump_policy(struct sk_buff *skb, struct netlink_callback *cb)
1698 struct net *net = sock_net(skb->sk);
1699 struct xfrm_policy_walk *walk = (struct xfrm_policy_walk *)cb->args;
1700 struct xfrm_dump_info info;
1702 info.in_skb = cb->skb;
1704 info.nlmsg_seq = cb->nlh->nlmsg_seq;
1705 info.nlmsg_flags = NLM_F_MULTI;
1707 (void) xfrm_policy_walk(net, walk, dump_one_policy, &info);
1712 static struct sk_buff *xfrm_policy_netlink(struct sk_buff *in_skb,
1713 struct xfrm_policy *xp,
1716 struct xfrm_dump_info info;
1717 struct sk_buff *skb;
1720 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1722 return ERR_PTR(-ENOMEM);
1724 info.in_skb = in_skb;
1726 info.nlmsg_seq = seq;
1727 info.nlmsg_flags = 0;
1729 err = dump_one_policy(xp, dir, 0, &info);
1732 return ERR_PTR(err);
1738 static int xfrm_get_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
1739 struct nlattr **attrs)
1741 struct net *net = sock_net(skb->sk);
1742 struct xfrm_policy *xp;
1743 struct xfrm_userpolicy_id *p;
1744 u8 type = XFRM_POLICY_TYPE_MAIN;
1749 u32 mark = xfrm_mark_get(attrs, &m);
1751 p = nlmsg_data(nlh);
1752 delete = nlh->nlmsg_type == XFRM_MSG_DELPOLICY;
1754 err = copy_from_user_policy_type(&type, attrs);
1758 err = verify_policy_dir(p->dir);
1763 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, delete, &err);
1765 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
1766 struct xfrm_sec_ctx *ctx;
1768 err = verify_sec_ctx_len(attrs);
1774 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
1776 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
1780 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir, &p->sel,
1782 security_xfrm_policy_free(ctx);
1788 struct sk_buff *resp_skb;
1790 resp_skb = xfrm_policy_netlink(skb, xp, p->dir, nlh->nlmsg_seq);
1791 if (IS_ERR(resp_skb)) {
1792 err = PTR_ERR(resp_skb);
1794 err = nlmsg_unicast(net->xfrm.nlsk, resp_skb,
1795 NETLINK_CB(skb).portid);
1798 xfrm_audit_policy_delete(xp, err ? 0 : 1, true);
1803 c.data.byid = p->index;
1804 c.event = nlh->nlmsg_type;
1805 c.seq = nlh->nlmsg_seq;
1806 c.portid = nlh->nlmsg_pid;
1807 km_policy_notify(xp, p->dir, &c);
1812 if (delete && err == 0)
1813 xfrm_garbage_collect(net);
1817 static int xfrm_flush_sa(struct sk_buff *skb, struct nlmsghdr *nlh,
1818 struct nlattr **attrs)
1820 struct net *net = sock_net(skb->sk);
1822 struct xfrm_usersa_flush *p = nlmsg_data(nlh);
1825 err = xfrm_state_flush(net, p->proto, true);
1827 if (err == -ESRCH) /* empty table */
1831 c.data.proto = p->proto;
1832 c.event = nlh->nlmsg_type;
1833 c.seq = nlh->nlmsg_seq;
1834 c.portid = nlh->nlmsg_pid;
1836 km_state_notify(NULL, &c);
1841 static inline size_t xfrm_aevent_msgsize(struct xfrm_state *x)
1843 size_t replay_size = x->replay_esn ?
1844 xfrm_replay_state_esn_len(x->replay_esn) :
1845 sizeof(struct xfrm_replay_state);
1847 return NLMSG_ALIGN(sizeof(struct xfrm_aevent_id))
1848 + nla_total_size(replay_size)
1849 + nla_total_size(sizeof(struct xfrm_lifetime_cur))
1850 + nla_total_size(sizeof(struct xfrm_mark))
1851 + nla_total_size(4) /* XFRM_AE_RTHR */
1852 + nla_total_size(4); /* XFRM_AE_ETHR */
1855 static int build_aevent(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
1857 struct xfrm_aevent_id *id;
1858 struct nlmsghdr *nlh;
1861 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_NEWAE, sizeof(*id), 0);
1865 id = nlmsg_data(nlh);
1866 memcpy(&id->sa_id.daddr, &x->id.daddr, sizeof(x->id.daddr));
1867 id->sa_id.spi = x->id.spi;
1868 id->sa_id.family = x->props.family;
1869 id->sa_id.proto = x->id.proto;
1870 memcpy(&id->saddr, &x->props.saddr, sizeof(x->props.saddr));
1871 id->reqid = x->props.reqid;
1872 id->flags = c->data.aevent;
1874 if (x->replay_esn) {
1875 err = nla_put(skb, XFRMA_REPLAY_ESN_VAL,
1876 xfrm_replay_state_esn_len(x->replay_esn),
1879 err = nla_put(skb, XFRMA_REPLAY_VAL, sizeof(x->replay),
1884 err = nla_put(skb, XFRMA_LTIME_VAL, sizeof(x->curlft), &x->curlft);
1888 if (id->flags & XFRM_AE_RTHR) {
1889 err = nla_put_u32(skb, XFRMA_REPLAY_THRESH, x->replay_maxdiff);
1893 if (id->flags & XFRM_AE_ETHR) {
1894 err = nla_put_u32(skb, XFRMA_ETIMER_THRESH,
1895 x->replay_maxage * 10 / HZ);
1899 err = xfrm_mark_put(skb, &x->mark);
1903 nlmsg_end(skb, nlh);
1907 nlmsg_cancel(skb, nlh);
1911 static int xfrm_get_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1912 struct nlattr **attrs)
1914 struct net *net = sock_net(skb->sk);
1915 struct xfrm_state *x;
1916 struct sk_buff *r_skb;
1921 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1922 struct xfrm_usersa_id *id = &p->sa_id;
1924 mark = xfrm_mark_get(attrs, &m);
1926 x = xfrm_state_lookup(net, mark, &id->daddr, id->spi, id->proto, id->family);
1930 r_skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
1931 if (r_skb == NULL) {
1937 * XXX: is this lock really needed - none of the other
1938 * gets lock (the concern is things getting updated
1939 * while we are still reading) - jhs
1941 spin_lock_bh(&x->lock);
1942 c.data.aevent = p->flags;
1943 c.seq = nlh->nlmsg_seq;
1944 c.portid = nlh->nlmsg_pid;
1946 if (build_aevent(r_skb, x, &c) < 0)
1948 err = nlmsg_unicast(net->xfrm.nlsk, r_skb, NETLINK_CB(skb).portid);
1949 spin_unlock_bh(&x->lock);
1954 static int xfrm_new_ae(struct sk_buff *skb, struct nlmsghdr *nlh,
1955 struct nlattr **attrs)
1957 struct net *net = sock_net(skb->sk);
1958 struct xfrm_state *x;
1963 struct xfrm_aevent_id *p = nlmsg_data(nlh);
1964 struct nlattr *rp = attrs[XFRMA_REPLAY_VAL];
1965 struct nlattr *re = attrs[XFRMA_REPLAY_ESN_VAL];
1966 struct nlattr *lt = attrs[XFRMA_LTIME_VAL];
1967 struct nlattr *et = attrs[XFRMA_ETIMER_THRESH];
1968 struct nlattr *rt = attrs[XFRMA_REPLAY_THRESH];
1970 if (!lt && !rp && !re && !et && !rt)
1973 /* pedantic mode - thou shalt sayeth replaceth */
1974 if (!(nlh->nlmsg_flags&NLM_F_REPLACE))
1977 mark = xfrm_mark_get(attrs, &m);
1979 x = xfrm_state_lookup(net, mark, &p->sa_id.daddr, p->sa_id.spi, p->sa_id.proto, p->sa_id.family);
1983 if (x->km.state != XFRM_STATE_VALID)
1986 err = xfrm_replay_verify_len(x->replay_esn, re);
1990 spin_lock_bh(&x->lock);
1991 xfrm_update_ae_params(x, attrs, 1);
1992 spin_unlock_bh(&x->lock);
1994 c.event = nlh->nlmsg_type;
1995 c.seq = nlh->nlmsg_seq;
1996 c.portid = nlh->nlmsg_pid;
1997 c.data.aevent = XFRM_AE_CU;
1998 km_state_notify(x, &c);
2005 static int xfrm_flush_policy(struct sk_buff *skb, struct nlmsghdr *nlh,
2006 struct nlattr **attrs)
2008 struct net *net = sock_net(skb->sk);
2010 u8 type = XFRM_POLICY_TYPE_MAIN;
2013 err = copy_from_user_policy_type(&type, attrs);
2017 err = xfrm_policy_flush(net, type, true);
2019 if (err == -ESRCH) /* empty table */
2025 c.event = nlh->nlmsg_type;
2026 c.seq = nlh->nlmsg_seq;
2027 c.portid = nlh->nlmsg_pid;
2029 km_policy_notify(NULL, 0, &c);
2033 static int xfrm_add_pol_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2034 struct nlattr **attrs)
2036 struct net *net = sock_net(skb->sk);
2037 struct xfrm_policy *xp;
2038 struct xfrm_user_polexpire *up = nlmsg_data(nlh);
2039 struct xfrm_userpolicy_info *p = &up->pol;
2040 u8 type = XFRM_POLICY_TYPE_MAIN;
2043 u32 mark = xfrm_mark_get(attrs, &m);
2045 err = copy_from_user_policy_type(&type, attrs);
2049 err = verify_policy_dir(p->dir);
2054 xp = xfrm_policy_byid(net, mark, type, p->dir, p->index, 0, &err);
2056 struct nlattr *rt = attrs[XFRMA_SEC_CTX];
2057 struct xfrm_sec_ctx *ctx;
2059 err = verify_sec_ctx_len(attrs);
2065 struct xfrm_user_sec_ctx *uctx = nla_data(rt);
2067 err = security_xfrm_policy_alloc(&ctx, uctx, GFP_KERNEL);
2071 xp = xfrm_policy_bysel_ctx(net, mark, type, p->dir,
2072 &p->sel, ctx, 0, &err);
2073 security_xfrm_policy_free(ctx);
2078 if (unlikely(xp->walk.dead))
2083 xfrm_policy_delete(xp, p->dir);
2084 xfrm_audit_policy_delete(xp, 1, true);
2086 // reset the timers here?
2087 WARN(1, "Don't know what to do with soft policy expire\n");
2089 km_policy_expired(xp, p->dir, up->hard, nlh->nlmsg_pid);
2096 static int xfrm_add_sa_expire(struct sk_buff *skb, struct nlmsghdr *nlh,
2097 struct nlattr **attrs)
2099 struct net *net = sock_net(skb->sk);
2100 struct xfrm_state *x;
2102 struct xfrm_user_expire *ue = nlmsg_data(nlh);
2103 struct xfrm_usersa_info *p = &ue->state;
2105 u32 mark = xfrm_mark_get(attrs, &m);
2107 x = xfrm_state_lookup(net, mark, &p->id.daddr, p->id.spi, p->id.proto, p->family);
2113 spin_lock_bh(&x->lock);
2115 if (x->km.state != XFRM_STATE_VALID)
2117 km_state_expired(x, ue->hard, nlh->nlmsg_pid);
2120 __xfrm_state_delete(x);
2121 xfrm_audit_state_delete(x, 1, true);
2125 spin_unlock_bh(&x->lock);
2130 static int xfrm_add_acquire(struct sk_buff *skb, struct nlmsghdr *nlh,
2131 struct nlattr **attrs)
2133 struct net *net = sock_net(skb->sk);
2134 struct xfrm_policy *xp;
2135 struct xfrm_user_tmpl *ut;
2137 struct nlattr *rt = attrs[XFRMA_TMPL];
2138 struct xfrm_mark mark;
2140 struct xfrm_user_acquire *ua = nlmsg_data(nlh);
2141 struct xfrm_state *x = xfrm_state_alloc(net);
2147 xfrm_mark_get(attrs, &mark);
2149 err = verify_newpolicy_info(&ua->policy);
2154 xp = xfrm_policy_construct(net, &ua->policy, attrs, &err);
2158 memcpy(&x->id, &ua->id, sizeof(ua->id));
2159 memcpy(&x->props.saddr, &ua->saddr, sizeof(ua->saddr));
2160 memcpy(&x->sel, &ua->sel, sizeof(ua->sel));
2161 xp->mark.m = x->mark.m = mark.m;
2162 xp->mark.v = x->mark.v = mark.v;
2164 /* extract the templates and for each call km_key */
2165 for (i = 0; i < xp->xfrm_nr; i++, ut++) {
2166 struct xfrm_tmpl *t = &xp->xfrm_vec[i];
2167 memcpy(&x->id, &t->id, sizeof(x->id));
2168 x->props.mode = t->mode;
2169 x->props.reqid = t->reqid;
2170 x->props.family = ut->family;
2171 t->aalgos = ua->aalgos;
2172 t->ealgos = ua->ealgos;
2173 t->calgos = ua->calgos;
2174 err = km_query(x, t, xp);
2184 WARN(1, "BAD policy passed\n");
2191 #ifdef CONFIG_XFRM_MIGRATE
2192 static int copy_from_user_migrate(struct xfrm_migrate *ma,
2193 struct xfrm_kmaddress *k,
2194 struct nlattr **attrs, int *num)
2196 struct nlattr *rt = attrs[XFRMA_MIGRATE];
2197 struct xfrm_user_migrate *um;
2201 struct xfrm_user_kmaddress *uk;
2203 uk = nla_data(attrs[XFRMA_KMADDRESS]);
2204 memcpy(&k->local, &uk->local, sizeof(k->local));
2205 memcpy(&k->remote, &uk->remote, sizeof(k->remote));
2206 k->family = uk->family;
2207 k->reserved = uk->reserved;
2211 num_migrate = nla_len(rt) / sizeof(*um);
2213 if (num_migrate <= 0 || num_migrate > XFRM_MAX_DEPTH)
2216 for (i = 0; i < num_migrate; i++, um++, ma++) {
2217 memcpy(&ma->old_daddr, &um->old_daddr, sizeof(ma->old_daddr));
2218 memcpy(&ma->old_saddr, &um->old_saddr, sizeof(ma->old_saddr));
2219 memcpy(&ma->new_daddr, &um->new_daddr, sizeof(ma->new_daddr));
2220 memcpy(&ma->new_saddr, &um->new_saddr, sizeof(ma->new_saddr));
2222 ma->proto = um->proto;
2223 ma->mode = um->mode;
2224 ma->reqid = um->reqid;
2226 ma->old_family = um->old_family;
2227 ma->new_family = um->new_family;
2234 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2235 struct nlattr **attrs)
2237 struct xfrm_userpolicy_id *pi = nlmsg_data(nlh);
2238 struct xfrm_migrate m[XFRM_MAX_DEPTH];
2239 struct xfrm_kmaddress km, *kmp;
2243 struct net *net = sock_net(skb->sk);
2245 if (attrs[XFRMA_MIGRATE] == NULL)
2248 kmp = attrs[XFRMA_KMADDRESS] ? &km : NULL;
2250 err = copy_from_user_policy_type(&type, attrs);
2254 err = copy_from_user_migrate((struct xfrm_migrate *)m, kmp, attrs, &n);
2261 xfrm_migrate(&pi->sel, pi->dir, type, m, n, kmp, net);
2266 static int xfrm_do_migrate(struct sk_buff *skb, struct nlmsghdr *nlh,
2267 struct nlattr **attrs)
2269 return -ENOPROTOOPT;
2273 #ifdef CONFIG_XFRM_MIGRATE
2274 static int copy_to_user_migrate(const struct xfrm_migrate *m, struct sk_buff *skb)
2276 struct xfrm_user_migrate um;
2278 memset(&um, 0, sizeof(um));
2279 um.proto = m->proto;
2281 um.reqid = m->reqid;
2282 um.old_family = m->old_family;
2283 memcpy(&um.old_daddr, &m->old_daddr, sizeof(um.old_daddr));
2284 memcpy(&um.old_saddr, &m->old_saddr, sizeof(um.old_saddr));
2285 um.new_family = m->new_family;
2286 memcpy(&um.new_daddr, &m->new_daddr, sizeof(um.new_daddr));
2287 memcpy(&um.new_saddr, &m->new_saddr, sizeof(um.new_saddr));
2289 return nla_put(skb, XFRMA_MIGRATE, sizeof(um), &um);
2292 static int copy_to_user_kmaddress(const struct xfrm_kmaddress *k, struct sk_buff *skb)
2294 struct xfrm_user_kmaddress uk;
2296 memset(&uk, 0, sizeof(uk));
2297 uk.family = k->family;
2298 uk.reserved = k->reserved;
2299 memcpy(&uk.local, &k->local, sizeof(uk.local));
2300 memcpy(&uk.remote, &k->remote, sizeof(uk.remote));
2302 return nla_put(skb, XFRMA_KMADDRESS, sizeof(uk), &uk);
2305 static inline size_t xfrm_migrate_msgsize(int num_migrate, int with_kma)
2307 return NLMSG_ALIGN(sizeof(struct xfrm_userpolicy_id))
2308 + (with_kma ? nla_total_size(sizeof(struct xfrm_kmaddress)) : 0)
2309 + nla_total_size(sizeof(struct xfrm_user_migrate) * num_migrate)
2310 + userpolicy_type_attrsize();
2313 static int build_migrate(struct sk_buff *skb, const struct xfrm_migrate *m,
2314 int num_migrate, const struct xfrm_kmaddress *k,
2315 const struct xfrm_selector *sel, u8 dir, u8 type)
2317 const struct xfrm_migrate *mp;
2318 struct xfrm_userpolicy_id *pol_id;
2319 struct nlmsghdr *nlh;
2322 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MIGRATE, sizeof(*pol_id), 0);
2326 pol_id = nlmsg_data(nlh);
2327 /* copy data from selector, dir, and type to the pol_id */
2328 memset(pol_id, 0, sizeof(*pol_id));
2329 memcpy(&pol_id->sel, sel, sizeof(pol_id->sel));
2333 err = copy_to_user_kmaddress(k, skb);
2337 err = copy_to_user_policy_type(type, skb);
2340 for (i = 0, mp = m ; i < num_migrate; i++, mp++) {
2341 err = copy_to_user_migrate(mp, skb);
2346 nlmsg_end(skb, nlh);
2350 nlmsg_cancel(skb, nlh);
2354 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2355 const struct xfrm_migrate *m, int num_migrate,
2356 const struct xfrm_kmaddress *k)
2358 struct net *net = &init_net;
2359 struct sk_buff *skb;
2361 skb = nlmsg_new(xfrm_migrate_msgsize(num_migrate, !!k), GFP_ATOMIC);
2366 if (build_migrate(skb, m, num_migrate, k, sel, dir, type) < 0)
2369 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MIGRATE);
2372 static int xfrm_send_migrate(const struct xfrm_selector *sel, u8 dir, u8 type,
2373 const struct xfrm_migrate *m, int num_migrate,
2374 const struct xfrm_kmaddress *k)
2376 return -ENOPROTOOPT;
2380 #define XMSGSIZE(type) sizeof(struct type)
2382 static const int xfrm_msg_min[XFRM_NR_MSGTYPES] = {
2383 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2384 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2385 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_id),
2386 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2387 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2388 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2389 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userspi_info),
2390 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_acquire),
2391 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_expire),
2392 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_info),
2393 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_info),
2394 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_polexpire),
2395 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = XMSGSIZE(xfrm_usersa_flush),
2396 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = 0,
2397 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2398 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_aevent_id),
2399 [XFRM_MSG_REPORT - XFRM_MSG_BASE] = XMSGSIZE(xfrm_user_report),
2400 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = XMSGSIZE(xfrm_userpolicy_id),
2401 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = sizeof(u32),
2402 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2403 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = sizeof(u32),
2408 static const struct nla_policy xfrma_policy[XFRMA_MAX+1] = {
2409 [XFRMA_SA] = { .len = sizeof(struct xfrm_usersa_info)},
2410 [XFRMA_POLICY] = { .len = sizeof(struct xfrm_userpolicy_info)},
2411 [XFRMA_LASTUSED] = { .type = NLA_U64},
2412 [XFRMA_ALG_AUTH_TRUNC] = { .len = sizeof(struct xfrm_algo_auth)},
2413 [XFRMA_ALG_AEAD] = { .len = sizeof(struct xfrm_algo_aead) },
2414 [XFRMA_ALG_AUTH] = { .len = sizeof(struct xfrm_algo) },
2415 [XFRMA_ALG_CRYPT] = { .len = sizeof(struct xfrm_algo) },
2416 [XFRMA_ALG_COMP] = { .len = sizeof(struct xfrm_algo) },
2417 [XFRMA_ENCAP] = { .len = sizeof(struct xfrm_encap_tmpl) },
2418 [XFRMA_TMPL] = { .len = sizeof(struct xfrm_user_tmpl) },
2419 [XFRMA_SEC_CTX] = { .len = sizeof(struct xfrm_sec_ctx) },
2420 [XFRMA_LTIME_VAL] = { .len = sizeof(struct xfrm_lifetime_cur) },
2421 [XFRMA_REPLAY_VAL] = { .len = sizeof(struct xfrm_replay_state) },
2422 [XFRMA_REPLAY_THRESH] = { .type = NLA_U32 },
2423 [XFRMA_ETIMER_THRESH] = { .type = NLA_U32 },
2424 [XFRMA_SRCADDR] = { .len = sizeof(xfrm_address_t) },
2425 [XFRMA_COADDR] = { .len = sizeof(xfrm_address_t) },
2426 [XFRMA_POLICY_TYPE] = { .len = sizeof(struct xfrm_userpolicy_type)},
2427 [XFRMA_MIGRATE] = { .len = sizeof(struct xfrm_user_migrate) },
2428 [XFRMA_KMADDRESS] = { .len = sizeof(struct xfrm_user_kmaddress) },
2429 [XFRMA_MARK] = { .len = sizeof(struct xfrm_mark) },
2430 [XFRMA_TFCPAD] = { .type = NLA_U32 },
2431 [XFRMA_REPLAY_ESN_VAL] = { .len = sizeof(struct xfrm_replay_state_esn) },
2432 [XFRMA_SA_EXTRA_FLAGS] = { .type = NLA_U32 },
2433 [XFRMA_PROTO] = { .type = NLA_U8 },
2434 [XFRMA_ADDRESS_FILTER] = { .len = sizeof(struct xfrm_address_filter) },
2437 static const struct nla_policy xfrma_spd_policy[XFRMA_SPD_MAX+1] = {
2438 [XFRMA_SPD_IPV4_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2439 [XFRMA_SPD_IPV6_HTHRESH] = { .len = sizeof(struct xfrmu_spdhthresh) },
2442 static const struct xfrm_link {
2443 int (*doit)(struct sk_buff *, struct nlmsghdr *, struct nlattr **);
2444 int (*start)(struct netlink_callback *);
2445 int (*dump)(struct sk_buff *, struct netlink_callback *);
2446 int (*done)(struct netlink_callback *);
2447 const struct nla_policy *nla_pol;
2449 } xfrm_dispatch[XFRM_NR_MSGTYPES] = {
2450 [XFRM_MSG_NEWSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2451 [XFRM_MSG_DELSA - XFRM_MSG_BASE] = { .doit = xfrm_del_sa },
2452 [XFRM_MSG_GETSA - XFRM_MSG_BASE] = { .doit = xfrm_get_sa,
2453 .dump = xfrm_dump_sa,
2454 .done = xfrm_dump_sa_done },
2455 [XFRM_MSG_NEWPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2456 [XFRM_MSG_DELPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy },
2457 [XFRM_MSG_GETPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_get_policy,
2458 .start = xfrm_dump_policy_start,
2459 .dump = xfrm_dump_policy,
2460 .done = xfrm_dump_policy_done },
2461 [XFRM_MSG_ALLOCSPI - XFRM_MSG_BASE] = { .doit = xfrm_alloc_userspi },
2462 [XFRM_MSG_ACQUIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_acquire },
2463 [XFRM_MSG_EXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_sa_expire },
2464 [XFRM_MSG_UPDPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_add_policy },
2465 [XFRM_MSG_UPDSA - XFRM_MSG_BASE] = { .doit = xfrm_add_sa },
2466 [XFRM_MSG_POLEXPIRE - XFRM_MSG_BASE] = { .doit = xfrm_add_pol_expire},
2467 [XFRM_MSG_FLUSHSA - XFRM_MSG_BASE] = { .doit = xfrm_flush_sa },
2468 [XFRM_MSG_FLUSHPOLICY - XFRM_MSG_BASE] = { .doit = xfrm_flush_policy },
2469 [XFRM_MSG_NEWAE - XFRM_MSG_BASE] = { .doit = xfrm_new_ae },
2470 [XFRM_MSG_GETAE - XFRM_MSG_BASE] = { .doit = xfrm_get_ae },
2471 [XFRM_MSG_MIGRATE - XFRM_MSG_BASE] = { .doit = xfrm_do_migrate },
2472 [XFRM_MSG_GETSADINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_sadinfo },
2473 [XFRM_MSG_NEWSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_set_spdinfo,
2474 .nla_pol = xfrma_spd_policy,
2475 .nla_max = XFRMA_SPD_MAX },
2476 [XFRM_MSG_GETSPDINFO - XFRM_MSG_BASE] = { .doit = xfrm_get_spdinfo },
2479 static int xfrm_user_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
2481 struct net *net = sock_net(skb->sk);
2482 struct nlattr *attrs[XFRMA_MAX+1];
2483 const struct xfrm_link *link;
2486 #ifdef CONFIG_COMPAT
2487 if (is_compat_task())
2491 type = nlh->nlmsg_type;
2492 if (type > XFRM_MSG_MAX)
2495 type -= XFRM_MSG_BASE;
2496 link = &xfrm_dispatch[type];
2498 /* All operations require privileges, even GET */
2499 if (!netlink_net_capable(skb, CAP_NET_ADMIN))
2502 if ((type == (XFRM_MSG_GETSA - XFRM_MSG_BASE) ||
2503 type == (XFRM_MSG_GETPOLICY - XFRM_MSG_BASE)) &&
2504 (nlh->nlmsg_flags & NLM_F_DUMP)) {
2505 if (link->dump == NULL)
2509 struct netlink_dump_control c = {
2510 .start = link->start,
2514 return netlink_dump_start(net->xfrm.nlsk, skb, nlh, &c);
2518 err = nlmsg_parse(nlh, xfrm_msg_min[type], attrs,
2519 link->nla_max ? : XFRMA_MAX,
2520 link->nla_pol ? : xfrma_policy);
2524 if (link->doit == NULL)
2527 return link->doit(skb, nlh, attrs);
2530 static void xfrm_netlink_rcv(struct sk_buff *skb)
2532 struct net *net = sock_net(skb->sk);
2534 mutex_lock(&net->xfrm.xfrm_cfg_mutex);
2535 netlink_rcv_skb(skb, &xfrm_user_rcv_msg);
2536 mutex_unlock(&net->xfrm.xfrm_cfg_mutex);
2539 static inline size_t xfrm_expire_msgsize(void)
2541 return NLMSG_ALIGN(sizeof(struct xfrm_user_expire))
2542 + nla_total_size(sizeof(struct xfrm_mark));
2545 static int build_expire(struct sk_buff *skb, struct xfrm_state *x, const struct km_event *c)
2547 struct xfrm_user_expire *ue;
2548 struct nlmsghdr *nlh;
2551 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_EXPIRE, sizeof(*ue), 0);
2555 ue = nlmsg_data(nlh);
2556 copy_to_user_state(x, &ue->state);
2557 ue->hard = (c->data.hard != 0) ? 1 : 0;
2559 err = xfrm_mark_put(skb, &x->mark);
2563 nlmsg_end(skb, nlh);
2567 static int xfrm_exp_state_notify(struct xfrm_state *x, const struct km_event *c)
2569 struct net *net = xs_net(x);
2570 struct sk_buff *skb;
2572 skb = nlmsg_new(xfrm_expire_msgsize(), GFP_ATOMIC);
2576 if (build_expire(skb, x, c) < 0) {
2581 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2584 static int xfrm_aevent_state_notify(struct xfrm_state *x, const struct km_event *c)
2586 struct net *net = xs_net(x);
2587 struct sk_buff *skb;
2589 skb = nlmsg_new(xfrm_aevent_msgsize(x), GFP_ATOMIC);
2593 if (build_aevent(skb, x, c) < 0)
2596 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_AEVENTS);
2599 static int xfrm_notify_sa_flush(const struct km_event *c)
2601 struct net *net = c->net;
2602 struct xfrm_usersa_flush *p;
2603 struct nlmsghdr *nlh;
2604 struct sk_buff *skb;
2605 int len = NLMSG_ALIGN(sizeof(struct xfrm_usersa_flush));
2607 skb = nlmsg_new(len, GFP_ATOMIC);
2611 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHSA, sizeof(*p), 0);
2617 p = nlmsg_data(nlh);
2618 p->proto = c->data.proto;
2620 nlmsg_end(skb, nlh);
2622 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2625 static inline size_t xfrm_sa_len(struct xfrm_state *x)
2629 l += nla_total_size(aead_len(x->aead));
2631 l += nla_total_size(sizeof(struct xfrm_algo) +
2632 (x->aalg->alg_key_len + 7) / 8);
2633 l += nla_total_size(xfrm_alg_auth_len(x->aalg));
2636 l += nla_total_size(xfrm_alg_len(x->ealg));
2638 l += nla_total_size(sizeof(*x->calg));
2640 l += nla_total_size(sizeof(*x->encap));
2642 l += nla_total_size(sizeof(x->tfcpad));
2644 l += nla_total_size(xfrm_replay_state_esn_len(x->replay_esn));
2646 l += nla_total_size(sizeof(struct xfrm_replay_state));
2648 l += nla_total_size(sizeof(struct xfrm_user_sec_ctx) +
2649 x->security->ctx_len);
2651 l += nla_total_size(sizeof(*x->coaddr));
2652 if (x->props.extra_flags)
2653 l += nla_total_size(sizeof(x->props.extra_flags));
2655 /* Must count x->lastused as it may become non-zero behind our back. */
2656 l += nla_total_size(sizeof(u64));
2661 static int xfrm_notify_sa(struct xfrm_state *x, const struct km_event *c)
2663 struct net *net = xs_net(x);
2664 struct xfrm_usersa_info *p;
2665 struct xfrm_usersa_id *id;
2666 struct nlmsghdr *nlh;
2667 struct sk_buff *skb;
2668 int len = xfrm_sa_len(x);
2671 headlen = sizeof(*p);
2672 if (c->event == XFRM_MSG_DELSA) {
2673 len += nla_total_size(headlen);
2674 headlen = sizeof(*id);
2675 len += nla_total_size(sizeof(struct xfrm_mark));
2677 len += NLMSG_ALIGN(headlen);
2679 skb = nlmsg_new(len, GFP_ATOMIC);
2683 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2688 p = nlmsg_data(nlh);
2689 if (c->event == XFRM_MSG_DELSA) {
2690 struct nlattr *attr;
2692 id = nlmsg_data(nlh);
2693 memcpy(&id->daddr, &x->id.daddr, sizeof(id->daddr));
2694 id->spi = x->id.spi;
2695 id->family = x->props.family;
2696 id->proto = x->id.proto;
2698 attr = nla_reserve(skb, XFRMA_SA, sizeof(*p));
2705 err = copy_to_user_state_extra(x, p, skb);
2709 nlmsg_end(skb, nlh);
2711 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_SA);
2718 static int xfrm_send_state_notify(struct xfrm_state *x, const struct km_event *c)
2722 case XFRM_MSG_EXPIRE:
2723 return xfrm_exp_state_notify(x, c);
2724 case XFRM_MSG_NEWAE:
2725 return xfrm_aevent_state_notify(x, c);
2726 case XFRM_MSG_DELSA:
2727 case XFRM_MSG_UPDSA:
2728 case XFRM_MSG_NEWSA:
2729 return xfrm_notify_sa(x, c);
2730 case XFRM_MSG_FLUSHSA:
2731 return xfrm_notify_sa_flush(c);
2733 printk(KERN_NOTICE "xfrm_user: Unknown SA event %d\n",
2742 static inline size_t xfrm_acquire_msgsize(struct xfrm_state *x,
2743 struct xfrm_policy *xp)
2745 return NLMSG_ALIGN(sizeof(struct xfrm_user_acquire))
2746 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2747 + nla_total_size(sizeof(struct xfrm_mark))
2748 + nla_total_size(xfrm_user_sec_ctx_size(x->security))
2749 + userpolicy_type_attrsize();
2752 static int build_acquire(struct sk_buff *skb, struct xfrm_state *x,
2753 struct xfrm_tmpl *xt, struct xfrm_policy *xp)
2755 __u32 seq = xfrm_get_acqseq();
2756 struct xfrm_user_acquire *ua;
2757 struct nlmsghdr *nlh;
2760 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_ACQUIRE, sizeof(*ua), 0);
2764 ua = nlmsg_data(nlh);
2765 memcpy(&ua->id, &x->id, sizeof(ua->id));
2766 memcpy(&ua->saddr, &x->props.saddr, sizeof(ua->saddr));
2767 memcpy(&ua->sel, &x->sel, sizeof(ua->sel));
2768 copy_to_user_policy(xp, &ua->policy, XFRM_POLICY_OUT);
2769 ua->aalgos = xt->aalgos;
2770 ua->ealgos = xt->ealgos;
2771 ua->calgos = xt->calgos;
2772 ua->seq = x->km.seq = seq;
2774 err = copy_to_user_tmpl(xp, skb);
2776 err = copy_to_user_state_sec_ctx(x, skb);
2778 err = copy_to_user_policy_type(xp->type, skb);
2780 err = xfrm_mark_put(skb, &xp->mark);
2782 nlmsg_cancel(skb, nlh);
2786 nlmsg_end(skb, nlh);
2790 static int xfrm_send_acquire(struct xfrm_state *x, struct xfrm_tmpl *xt,
2791 struct xfrm_policy *xp)
2793 struct net *net = xs_net(x);
2794 struct sk_buff *skb;
2796 skb = nlmsg_new(xfrm_acquire_msgsize(x, xp), GFP_ATOMIC);
2800 if (build_acquire(skb, x, xt, xp) < 0)
2803 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_ACQUIRE);
2806 /* User gives us xfrm_user_policy_info followed by an array of 0
2807 * or more templates.
2809 static struct xfrm_policy *xfrm_compile_policy(struct sock *sk, int opt,
2810 u8 *data, int len, int *dir)
2812 struct net *net = sock_net(sk);
2813 struct xfrm_userpolicy_info *p = (struct xfrm_userpolicy_info *)data;
2814 struct xfrm_user_tmpl *ut = (struct xfrm_user_tmpl *) (p + 1);
2815 struct xfrm_policy *xp;
2818 switch (sk->sk_family) {
2820 if (opt != IP_XFRM_POLICY) {
2825 #if IS_ENABLED(CONFIG_IPV6)
2827 if (opt != IPV6_XFRM_POLICY) {
2840 if (len < sizeof(*p) ||
2841 verify_newpolicy_info(p))
2844 nr = ((len - sizeof(*p)) / sizeof(*ut));
2845 if (validate_tmpl(nr, ut, p->sel.family))
2848 if (p->dir > XFRM_POLICY_OUT)
2851 xp = xfrm_policy_alloc(net, GFP_ATOMIC);
2857 copy_from_user_policy(xp, p);
2858 xp->type = XFRM_POLICY_TYPE_MAIN;
2859 copy_templates(xp, ut, nr);
2866 static inline size_t xfrm_polexpire_msgsize(struct xfrm_policy *xp)
2868 return NLMSG_ALIGN(sizeof(struct xfrm_user_polexpire))
2869 + nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr)
2870 + nla_total_size(xfrm_user_sec_ctx_size(xp->security))
2871 + nla_total_size(sizeof(struct xfrm_mark))
2872 + userpolicy_type_attrsize();
2875 static int build_polexpire(struct sk_buff *skb, struct xfrm_policy *xp,
2876 int dir, const struct km_event *c)
2878 struct xfrm_user_polexpire *upe;
2879 int hard = c->data.hard;
2880 struct nlmsghdr *nlh;
2883 nlh = nlmsg_put(skb, c->portid, 0, XFRM_MSG_POLEXPIRE, sizeof(*upe), 0);
2887 upe = nlmsg_data(nlh);
2888 copy_to_user_policy(xp, &upe->pol, dir);
2889 err = copy_to_user_tmpl(xp, skb);
2891 err = copy_to_user_sec_ctx(xp, skb);
2893 err = copy_to_user_policy_type(xp->type, skb);
2895 err = xfrm_mark_put(skb, &xp->mark);
2897 nlmsg_cancel(skb, nlh);
2902 nlmsg_end(skb, nlh);
2906 static int xfrm_exp_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
2908 struct net *net = xp_net(xp);
2909 struct sk_buff *skb;
2911 skb = nlmsg_new(xfrm_polexpire_msgsize(xp), GFP_ATOMIC);
2915 if (build_polexpire(skb, xp, dir, c) < 0)
2918 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_EXPIRE);
2921 static int xfrm_notify_policy(struct xfrm_policy *xp, int dir, const struct km_event *c)
2923 int len = nla_total_size(sizeof(struct xfrm_user_tmpl) * xp->xfrm_nr);
2924 struct net *net = xp_net(xp);
2925 struct xfrm_userpolicy_info *p;
2926 struct xfrm_userpolicy_id *id;
2927 struct nlmsghdr *nlh;
2928 struct sk_buff *skb;
2931 headlen = sizeof(*p);
2932 if (c->event == XFRM_MSG_DELPOLICY) {
2933 len += nla_total_size(headlen);
2934 headlen = sizeof(*id);
2936 len += userpolicy_type_attrsize();
2937 len += nla_total_size(sizeof(struct xfrm_mark));
2938 len += NLMSG_ALIGN(headlen);
2940 skb = nlmsg_new(len, GFP_ATOMIC);
2944 nlh = nlmsg_put(skb, c->portid, c->seq, c->event, headlen, 0);
2949 p = nlmsg_data(nlh);
2950 if (c->event == XFRM_MSG_DELPOLICY) {
2951 struct nlattr *attr;
2953 id = nlmsg_data(nlh);
2954 memset(id, 0, sizeof(*id));
2957 id->index = xp->index;
2959 memcpy(&id->sel, &xp->selector, sizeof(id->sel));
2961 attr = nla_reserve(skb, XFRMA_POLICY, sizeof(*p));
2969 copy_to_user_policy(xp, p, dir);
2970 err = copy_to_user_tmpl(xp, skb);
2972 err = copy_to_user_policy_type(xp->type, skb);
2974 err = xfrm_mark_put(skb, &xp->mark);
2978 nlmsg_end(skb, nlh);
2980 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
2987 static int xfrm_notify_policy_flush(const struct km_event *c)
2989 struct net *net = c->net;
2990 struct nlmsghdr *nlh;
2991 struct sk_buff *skb;
2994 skb = nlmsg_new(userpolicy_type_attrsize(), GFP_ATOMIC);
2998 nlh = nlmsg_put(skb, c->portid, c->seq, XFRM_MSG_FLUSHPOLICY, 0, 0);
3002 err = copy_to_user_policy_type(c->data.type, skb);
3006 nlmsg_end(skb, nlh);
3008 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_POLICY);
3015 static int xfrm_send_policy_notify(struct xfrm_policy *xp, int dir, const struct km_event *c)
3019 case XFRM_MSG_NEWPOLICY:
3020 case XFRM_MSG_UPDPOLICY:
3021 case XFRM_MSG_DELPOLICY:
3022 return xfrm_notify_policy(xp, dir, c);
3023 case XFRM_MSG_FLUSHPOLICY:
3024 return xfrm_notify_policy_flush(c);
3025 case XFRM_MSG_POLEXPIRE:
3026 return xfrm_exp_policy_notify(xp, dir, c);
3028 printk(KERN_NOTICE "xfrm_user: Unknown Policy event %d\n",
3036 static inline size_t xfrm_report_msgsize(void)
3038 return NLMSG_ALIGN(sizeof(struct xfrm_user_report));
3041 static int build_report(struct sk_buff *skb, u8 proto,
3042 struct xfrm_selector *sel, xfrm_address_t *addr)
3044 struct xfrm_user_report *ur;
3045 struct nlmsghdr *nlh;
3047 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_REPORT, sizeof(*ur), 0);
3051 ur = nlmsg_data(nlh);
3053 memcpy(&ur->sel, sel, sizeof(ur->sel));
3056 int err = nla_put(skb, XFRMA_COADDR, sizeof(*addr), addr);
3058 nlmsg_cancel(skb, nlh);
3062 nlmsg_end(skb, nlh);
3066 static int xfrm_send_report(struct net *net, u8 proto,
3067 struct xfrm_selector *sel, xfrm_address_t *addr)
3069 struct sk_buff *skb;
3071 skb = nlmsg_new(xfrm_report_msgsize(), GFP_ATOMIC);
3075 if (build_report(skb, proto, sel, addr) < 0)
3078 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_REPORT);
3081 static inline size_t xfrm_mapping_msgsize(void)
3083 return NLMSG_ALIGN(sizeof(struct xfrm_user_mapping));
3086 static int build_mapping(struct sk_buff *skb, struct xfrm_state *x,
3087 xfrm_address_t *new_saddr, __be16 new_sport)
3089 struct xfrm_user_mapping *um;
3090 struct nlmsghdr *nlh;
3092 nlh = nlmsg_put(skb, 0, 0, XFRM_MSG_MAPPING, sizeof(*um), 0);
3096 um = nlmsg_data(nlh);
3098 memcpy(&um->id.daddr, &x->id.daddr, sizeof(um->id.daddr));
3099 um->id.spi = x->id.spi;
3100 um->id.family = x->props.family;
3101 um->id.proto = x->id.proto;
3102 memcpy(&um->new_saddr, new_saddr, sizeof(um->new_saddr));
3103 memcpy(&um->old_saddr, &x->props.saddr, sizeof(um->old_saddr));
3104 um->new_sport = new_sport;
3105 um->old_sport = x->encap->encap_sport;
3106 um->reqid = x->props.reqid;
3108 nlmsg_end(skb, nlh);
3112 static int xfrm_send_mapping(struct xfrm_state *x, xfrm_address_t *ipaddr,
3115 struct net *net = xs_net(x);
3116 struct sk_buff *skb;
3118 if (x->id.proto != IPPROTO_ESP)
3124 skb = nlmsg_new(xfrm_mapping_msgsize(), GFP_ATOMIC);
3128 if (build_mapping(skb, x, ipaddr, sport) < 0)
3131 return xfrm_nlmsg_multicast(net, skb, 0, XFRMNLGRP_MAPPING);
3134 static bool xfrm_is_alive(const struct km_event *c)
3136 return (bool)xfrm_acquire_is_on(c->net);
3139 static struct xfrm_mgr netlink_mgr = {
3141 .notify = xfrm_send_state_notify,
3142 .acquire = xfrm_send_acquire,
3143 .compile_policy = xfrm_compile_policy,
3144 .notify_policy = xfrm_send_policy_notify,
3145 .report = xfrm_send_report,
3146 .migrate = xfrm_send_migrate,
3147 .new_mapping = xfrm_send_mapping,
3148 .is_alive = xfrm_is_alive,
3151 static int __net_init xfrm_user_net_init(struct net *net)
3154 struct netlink_kernel_cfg cfg = {
3155 .groups = XFRMNLGRP_MAX,
3156 .input = xfrm_netlink_rcv,
3159 nlsk = netlink_kernel_create(net, NETLINK_XFRM, &cfg);
3162 net->xfrm.nlsk_stash = nlsk; /* Don't set to NULL */
3163 rcu_assign_pointer(net->xfrm.nlsk, nlsk);
3167 static void __net_exit xfrm_user_net_exit(struct list_head *net_exit_list)
3170 list_for_each_entry(net, net_exit_list, exit_list)
3171 RCU_INIT_POINTER(net->xfrm.nlsk, NULL);
3173 list_for_each_entry(net, net_exit_list, exit_list)
3174 netlink_kernel_release(net->xfrm.nlsk_stash);
3177 static struct pernet_operations xfrm_user_net_ops = {
3178 .init = xfrm_user_net_init,
3179 .exit_batch = xfrm_user_net_exit,
3182 static int __init xfrm_user_init(void)
3186 printk(KERN_INFO "Initializing XFRM netlink socket\n");
3188 rv = register_pernet_subsys(&xfrm_user_net_ops);
3191 rv = xfrm_register_km(&netlink_mgr);
3193 unregister_pernet_subsys(&xfrm_user_net_ops);
3197 static void __exit xfrm_user_exit(void)
3199 xfrm_unregister_km(&netlink_mgr);
3200 unregister_pernet_subsys(&xfrm_user_net_ops);
3203 module_init(xfrm_user_init);
3204 module_exit(xfrm_user_exit);
3205 MODULE_LICENSE("GPL");
3206 MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_XFRM);