1 // SPDX-License-Identifier: GPL-2.0-only
2 #define pr_fmt(fmt) "IPsec: " fmt
4 #include <crypto/aead.h>
5 #include <crypto/authenc.h>
7 #include <linux/module.h>
11 #include <linux/scatterlist.h>
12 #include <linux/kernel.h>
13 #include <linux/pfkeyv2.h>
14 #include <linux/rtnetlink.h>
15 #include <linux/slab.h>
16 #include <linux/spinlock.h>
17 #include <linux/in6.h>
19 #include <net/protocol.h>
22 #include <net/espintcp.h>
24 #include <linux/highmem.h>
27 struct xfrm_skb_cb xfrm;
31 struct esp_output_extra {
36 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
39 * Allocate an AEAD request structure with extra space for SG and IV.
41 * For alignment considerations the IV is placed at the front, followed
42 * by the request and finally the SG list.
44 * TODO: Use spare space in skb for this where possible.
46 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen)
52 len += crypto_aead_ivsize(aead);
55 len += crypto_aead_alignmask(aead) &
56 ~(crypto_tfm_ctx_alignment() - 1);
57 len = ALIGN(len, crypto_tfm_ctx_alignment());
60 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
61 len = ALIGN(len, __alignof__(struct scatterlist));
63 len += sizeof(struct scatterlist) * nfrags;
65 return kmalloc(len, GFP_ATOMIC);
68 static inline void *esp_tmp_extra(void *tmp)
70 return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra));
73 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen)
75 return crypto_aead_ivsize(aead) ?
76 PTR_ALIGN((u8 *)tmp + extralen,
77 crypto_aead_alignmask(aead) + 1) : tmp + extralen;
80 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
82 struct aead_request *req;
84 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
85 crypto_tfm_ctx_alignment());
86 aead_request_set_tfm(req, aead);
90 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
91 struct aead_request *req)
93 return (void *)ALIGN((unsigned long)(req + 1) +
94 crypto_aead_reqsize(aead),
95 __alignof__(struct scatterlist));
98 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
100 struct crypto_aead *aead = x->data;
103 struct aead_request *req;
104 struct scatterlist *sg;
106 if (x->props.flags & XFRM_STATE_ESN)
107 extralen += sizeof(struct esp_output_extra);
109 iv = esp_tmp_iv(aead, tmp, extralen);
110 req = esp_tmp_req(aead, iv);
112 /* Unref skb_frag_pages in the src scatterlist if necessary.
113 * Skip the first sg which comes from skb->data.
115 if (req->src != req->dst)
116 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
117 put_page(sg_page(sg));
120 #ifdef CONFIG_INET_ESPINTCP
126 static void esp_free_tcp_sk(struct rcu_head *head)
128 struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu);
134 static struct sock *esp_find_tcp_sk(struct xfrm_state *x)
136 struct xfrm_encap_tmpl *encap = x->encap;
137 struct esp_tcp_sk *esk;
142 sk = rcu_dereference(x->encap_sk);
143 if (sk && sk->sk_state == TCP_ESTABLISHED)
146 spin_lock_bh(&x->lock);
147 sport = encap->encap_sport;
148 dport = encap->encap_dport;
149 nsk = rcu_dereference_protected(x->encap_sk,
150 lockdep_is_held(&x->lock));
151 if (sk && sk == nsk) {
152 esk = kmalloc(sizeof(*esk), GFP_ATOMIC);
154 spin_unlock_bh(&x->lock);
155 return ERR_PTR(-ENOMEM);
157 RCU_INIT_POINTER(x->encap_sk, NULL);
159 call_rcu(&esk->rcu, esp_free_tcp_sk);
161 spin_unlock_bh(&x->lock);
163 sk = inet_lookup_established(xs_net(x), &tcp_hashinfo, x->id.daddr.a4,
164 dport, x->props.saddr.a4, sport, 0);
166 return ERR_PTR(-ENOENT);
168 if (!tcp_is_ulp_esp(sk)) {
170 return ERR_PTR(-EINVAL);
173 spin_lock_bh(&x->lock);
174 nsk = rcu_dereference_protected(x->encap_sk,
175 lockdep_is_held(&x->lock));
176 if (encap->encap_sport != sport ||
177 encap->encap_dport != dport) {
179 sk = nsk ?: ERR_PTR(-EREMCHG);
180 } else if (sk == nsk) {
183 rcu_assign_pointer(x->encap_sk, sk);
185 spin_unlock_bh(&x->lock);
190 static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb)
197 sk = esp_find_tcp_sk(x);
198 err = PTR_ERR_OR_ZERO(sk);
203 if (sock_owned_by_user(sk))
204 err = espintcp_queue_out(sk, skb);
206 err = espintcp_push_skb(sk, skb);
214 static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk,
217 struct dst_entry *dst = skb_dst(skb);
218 struct xfrm_state *x = dst->xfrm;
220 return esp_output_tcp_finish(x, skb);
223 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
228 err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb);
231 /* EINPROGRESS just happens to do the right thing. It
232 * actually means that the skb has been consumed and
235 return err ?: -EINPROGRESS;
238 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
246 static void esp_output_done(struct crypto_async_request *base, int err)
248 struct sk_buff *skb = base->data;
249 struct xfrm_offload *xo = xfrm_offload(skb);
251 struct xfrm_state *x;
253 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
254 struct sec_path *sp = skb_sec_path(skb);
256 x = sp->xvec[sp->len - 1];
258 x = skb_dst(skb)->xfrm;
261 tmp = ESP_SKB_CB(skb)->tmp;
262 esp_ssg_unref(x, tmp);
265 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
267 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
272 skb_push(skb, skb->data - skb_mac_header(skb));
274 xfrm_dev_resume(skb);
277 x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
278 esp_output_tail_tcp(x, skb);
280 xfrm_output_resume(skb->sk, skb, err);
284 /* Move ESP header back into place. */
285 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
287 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
288 void *tmp = ESP_SKB_CB(skb)->tmp;
289 __be32 *seqhi = esp_tmp_extra(tmp);
291 esph->seq_no = esph->spi;
295 static void esp_output_restore_header(struct sk_buff *skb)
297 void *tmp = ESP_SKB_CB(skb)->tmp;
298 struct esp_output_extra *extra = esp_tmp_extra(tmp);
300 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
304 static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
305 struct xfrm_state *x,
306 struct ip_esp_hdr *esph,
307 struct esp_output_extra *extra)
309 /* For ESN we move the header forward by 4 bytes to
310 * accommodate the high bits. We will move it back after
313 if ((x->props.flags & XFRM_STATE_ESN)) {
315 struct xfrm_offload *xo = xfrm_offload(skb);
320 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
322 extra->esphoff = (unsigned char *)esph -
323 skb_transport_header(skb);
324 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
325 extra->seqhi = esph->spi;
326 esph->seq_no = htonl(seqhi);
329 esph->spi = x->id.spi;
334 static void esp_output_done_esn(struct crypto_async_request *base, int err)
336 struct sk_buff *skb = base->data;
338 esp_output_restore_header(skb);
339 esp_output_done(base, err);
342 static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
344 struct esp_info *esp,
352 len = skb->len + esp->tailen - skb_transport_offset(skb);
353 if (len + sizeof(struct iphdr) > IP_MAX_MTU)
354 return ERR_PTR(-EMSGSIZE);
356 uh = (struct udphdr *)esp->esph;
359 uh->len = htons(len);
362 *skb_mac_header(skb) = IPPROTO_UDP;
364 if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
365 udpdata32 = (__be32 *)(uh + 1);
366 udpdata32[0] = udpdata32[1] = 0;
367 return (struct ip_esp_hdr *)(udpdata32 + 2);
370 return (struct ip_esp_hdr *)(uh + 1);
373 #ifdef CONFIG_INET_ESPINTCP
374 static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
376 struct esp_info *esp)
378 __be16 *lenp = (void *)esp->esph;
379 struct ip_esp_hdr *esph;
383 len = skb->len + esp->tailen - skb_transport_offset(skb);
384 if (len > IP_MAX_MTU)
385 return ERR_PTR(-EMSGSIZE);
388 sk = esp_find_tcp_sk(x);
395 esph = (struct ip_esp_hdr *)(lenp + 1);
400 static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
402 struct esp_info *esp)
404 return ERR_PTR(-EOPNOTSUPP);
408 static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
409 struct esp_info *esp)
411 struct xfrm_encap_tmpl *encap = x->encap;
412 struct ip_esp_hdr *esph;
416 spin_lock_bh(&x->lock);
417 sport = encap->encap_sport;
418 dport = encap->encap_dport;
419 encap_type = encap->encap_type;
420 spin_unlock_bh(&x->lock);
422 switch (encap_type) {
424 case UDP_ENCAP_ESPINUDP:
425 case UDP_ENCAP_ESPINUDP_NON_IKE:
426 esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
428 case TCP_ENCAP_ESPINTCP:
429 esph = esp_output_tcp_encap(x, skb, esp);
434 return PTR_ERR(esph);
441 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
447 struct sk_buff *trailer;
448 int tailen = esp->tailen;
450 /* this is non-NULL only with TCP/UDP Encapsulation */
452 int err = esp_output_encap(x, skb, esp);
458 if (ALIGN(tailen, L1_CACHE_BYTES) > PAGE_SIZE ||
459 ALIGN(skb->data_len, L1_CACHE_BYTES) > PAGE_SIZE)
462 if (!skb_cloned(skb)) {
463 if (tailen <= skb_tailroom(skb)) {
466 tail = skb_tail_pointer(trailer);
469 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
470 && !skb_has_frag_list(skb)) {
472 struct sock *sk = skb->sk;
473 struct page_frag *pfrag = &x->xfrag;
475 esp->inplace = false;
477 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
479 spin_lock_bh(&x->lock);
481 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
482 spin_unlock_bh(&x->lock);
489 tail = page_address(page) + pfrag->offset;
491 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
493 nfrags = skb_shinfo(skb)->nr_frags;
495 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
497 skb_shinfo(skb)->nr_frags = ++nfrags;
499 pfrag->offset = pfrag->offset + allocsize;
501 spin_unlock_bh(&x->lock);
506 skb->data_len += tailen;
507 skb->truesize += tailen;
508 if (sk && sk_fullsock(sk))
509 refcount_add(tailen, &sk->sk_wmem_alloc);
516 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
518 nfrags = skb_cow_data(skb, tailen, &trailer);
521 tail = skb_tail_pointer(trailer);
522 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
525 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
526 pskb_put(skb, trailer, tailen);
531 EXPORT_SYMBOL_GPL(esp_output_head);
533 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
542 struct ip_esp_hdr *esph;
543 struct crypto_aead *aead;
544 struct aead_request *req;
545 struct scatterlist *sg, *dsg;
546 struct esp_output_extra *extra;
549 assoclen = sizeof(struct ip_esp_hdr);
552 if (x->props.flags & XFRM_STATE_ESN) {
553 extralen += sizeof(*extra);
554 assoclen += sizeof(__be32);
558 alen = crypto_aead_authsize(aead);
559 ivlen = crypto_aead_ivsize(aead);
561 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
565 extra = esp_tmp_extra(tmp);
566 iv = esp_tmp_iv(aead, tmp, extralen);
567 req = esp_tmp_req(aead, iv);
568 sg = esp_req_sg(aead, req);
573 dsg = &sg[esp->nfrags];
575 esph = esp_output_set_extra(skb, x, esp->esph, extra);
578 sg_init_table(sg, esp->nfrags);
579 err = skb_to_sgvec(skb, sg,
580 (unsigned char *)esph - skb->data,
581 assoclen + ivlen + esp->clen + alen);
582 if (unlikely(err < 0))
587 struct page_frag *pfrag = &x->xfrag;
589 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
591 spin_lock_bh(&x->lock);
592 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
593 spin_unlock_bh(&x->lock);
597 skb_shinfo(skb)->nr_frags = 1;
601 /* replace page frags in skb with new page */
602 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
603 pfrag->offset = pfrag->offset + allocsize;
604 spin_unlock_bh(&x->lock);
606 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
607 err = skb_to_sgvec(skb, dsg,
608 (unsigned char *)esph - skb->data,
609 assoclen + ivlen + esp->clen + alen);
610 if (unlikely(err < 0))
614 if ((x->props.flags & XFRM_STATE_ESN))
615 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
617 aead_request_set_callback(req, 0, esp_output_done, skb);
619 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
620 aead_request_set_ad(req, assoclen);
622 memset(iv, 0, ivlen);
623 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
626 ESP_SKB_CB(skb)->tmp = tmp;
627 err = crypto_aead_encrypt(req);
638 if ((x->props.flags & XFRM_STATE_ESN))
639 esp_output_restore_header(skb);
643 esp_ssg_unref(x, tmp);
645 if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
646 err = esp_output_tail_tcp(x, skb);
653 EXPORT_SYMBOL_GPL(esp_output_tail);
655 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
659 struct ip_esp_hdr *esph;
660 struct crypto_aead *aead;
665 esp.proto = *skb_mac_header(skb);
666 *skb_mac_header(skb) = IPPROTO_ESP;
668 /* skb is pure payload to encrypt */
671 alen = crypto_aead_authsize(aead);
675 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
678 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
679 if (skb->len < padto)
680 esp.tfclen = padto - skb->len;
682 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
683 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
684 esp.plen = esp.clen - skb->len - esp.tfclen;
685 esp.tailen = esp.tfclen + esp.plen + alen;
687 esp.esph = ip_esp_hdr(skb);
689 esp.nfrags = esp_output_head(x, skb, &esp);
694 esph->spi = x->id.spi;
696 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
697 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
698 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
700 skb_push(skb, -skb_network_offset(skb));
702 return esp_output_tail(x, skb, &esp);
705 static inline int esp_remove_trailer(struct sk_buff *skb)
707 struct xfrm_state *x = xfrm_input_state(skb);
708 struct xfrm_offload *xo = xfrm_offload(skb);
709 struct crypto_aead *aead = x->data;
710 int alen, hlen, elen;
716 alen = crypto_aead_authsize(aead);
717 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
718 elen = skb->len - hlen;
720 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
725 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
730 if (padlen + 2 + alen >= elen) {
731 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
732 padlen + 2, elen - alen);
736 trimlen = alen + padlen + 2;
737 if (skb->ip_summed == CHECKSUM_COMPLETE) {
738 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
739 skb->csum = csum_block_sub(skb->csum, csumdiff,
742 pskb_trim(skb, skb->len - trimlen);
750 int esp_input_done2(struct sk_buff *skb, int err)
752 const struct iphdr *iph;
753 struct xfrm_state *x = xfrm_input_state(skb);
754 struct xfrm_offload *xo = xfrm_offload(skb);
755 struct crypto_aead *aead = x->data;
756 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
759 if (!xo || !(xo->flags & CRYPTO_DONE))
760 kfree(ESP_SKB_CB(skb)->tmp);
765 err = esp_remove_trailer(skb);
766 if (unlikely(err < 0))
773 struct xfrm_encap_tmpl *encap = x->encap;
774 struct tcphdr *th = (void *)(skb_network_header(skb) + ihl);
775 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
778 switch (x->encap->encap_type) {
779 case TCP_ENCAP_ESPINTCP:
782 case UDP_ENCAP_ESPINUDP:
783 case UDP_ENCAP_ESPINUDP_NON_IKE:
793 * 1) if the NAT-T peer's IP or port changed then
794 * advertize the change to the keying daemon.
795 * This is an inbound SA, so just compare
798 if (iph->saddr != x->props.saddr.a4 ||
799 source != encap->encap_sport) {
800 xfrm_address_t ipaddr;
802 ipaddr.a4 = iph->saddr;
803 km_new_mapping(x, &ipaddr, source);
805 /* XXX: perhaps add an extra
806 * policy check here, to see
807 * if we should allow or
808 * reject a packet from a
815 * 2) ignore UDP/TCP checksums in case
816 * of NAT-T in Transport Mode, or
817 * perform other post-processing fixes
818 * as per draft-ietf-ipsec-udp-encaps-06,
821 if (x->props.mode == XFRM_MODE_TRANSPORT)
822 skb->ip_summed = CHECKSUM_UNNECESSARY;
825 skb_pull_rcsum(skb, hlen);
826 if (x->props.mode == XFRM_MODE_TUNNEL)
827 skb_reset_transport_header(skb);
829 skb_set_transport_header(skb, -ihl);
831 /* RFC4303: Drop dummy packets without any error */
832 if (err == IPPROTO_NONE)
838 EXPORT_SYMBOL_GPL(esp_input_done2);
840 static void esp_input_done(struct crypto_async_request *base, int err)
842 struct sk_buff *skb = base->data;
844 xfrm_input_resume(skb, esp_input_done2(skb, err));
847 static void esp_input_restore_header(struct sk_buff *skb)
849 esp_restore_header(skb, 0);
853 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
855 struct xfrm_state *x = xfrm_input_state(skb);
856 struct ip_esp_hdr *esph;
858 /* For ESN we move the header forward by 4 bytes to
859 * accommodate the high bits. We will move it back after
862 if ((x->props.flags & XFRM_STATE_ESN)) {
863 esph = skb_push(skb, 4);
865 esph->spi = esph->seq_no;
866 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
870 static void esp_input_done_esn(struct crypto_async_request *base, int err)
872 struct sk_buff *skb = base->data;
874 esp_input_restore_header(skb);
875 esp_input_done(base, err);
879 * Note: detecting truncated vs. non-truncated authentication data is very
880 * expensive, so we only support truncated data, which is the recommended
883 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
885 struct crypto_aead *aead = x->data;
886 struct aead_request *req;
887 struct sk_buff *trailer;
888 int ivlen = crypto_aead_ivsize(aead);
889 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
896 struct scatterlist *sg;
899 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
905 assoclen = sizeof(struct ip_esp_hdr);
908 if (x->props.flags & XFRM_STATE_ESN) {
909 seqhilen += sizeof(__be32);
910 assoclen += seqhilen;
913 if (!skb_cloned(skb)) {
914 if (!skb_is_nonlinear(skb)) {
918 } else if (!skb_has_frag_list(skb)) {
919 nfrags = skb_shinfo(skb)->nr_frags;
926 err = skb_cow_data(skb, 0, &trailer);
934 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
938 ESP_SKB_CB(skb)->tmp = tmp;
939 seqhi = esp_tmp_extra(tmp);
940 iv = esp_tmp_iv(aead, tmp, seqhilen);
941 req = esp_tmp_req(aead, iv);
942 sg = esp_req_sg(aead, req);
944 esp_input_set_header(skb, seqhi);
946 sg_init_table(sg, nfrags);
947 err = skb_to_sgvec(skb, sg, 0, skb->len);
948 if (unlikely(err < 0)) {
953 skb->ip_summed = CHECKSUM_NONE;
955 if ((x->props.flags & XFRM_STATE_ESN))
956 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
958 aead_request_set_callback(req, 0, esp_input_done, skb);
960 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
961 aead_request_set_ad(req, assoclen);
963 err = crypto_aead_decrypt(req);
964 if (err == -EINPROGRESS)
967 if ((x->props.flags & XFRM_STATE_ESN))
968 esp_input_restore_header(skb);
970 err = esp_input_done2(skb, err);
976 static int esp4_err(struct sk_buff *skb, u32 info)
978 struct net *net = dev_net(skb->dev);
979 const struct iphdr *iph = (const struct iphdr *)skb->data;
980 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
981 struct xfrm_state *x;
983 switch (icmp_hdr(skb)->type) {
984 case ICMP_DEST_UNREACH:
985 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
994 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
995 esph->spi, IPPROTO_ESP, AF_INET);
999 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
1000 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
1002 ipv4_redirect(skb, net, 0, IPPROTO_ESP);
1008 static void esp_destroy(struct xfrm_state *x)
1010 struct crypto_aead *aead = x->data;
1015 crypto_free_aead(aead);
1018 static int esp_init_aead(struct xfrm_state *x)
1020 char aead_name[CRYPTO_MAX_ALG_NAME];
1021 struct crypto_aead *aead;
1024 err = -ENAMETOOLONG;
1025 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
1026 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
1029 aead = crypto_alloc_aead(aead_name, 0, 0);
1030 err = PTR_ERR(aead);
1036 err = crypto_aead_setkey(aead, x->aead->alg_key,
1037 (x->aead->alg_key_len + 7) / 8);
1041 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
1049 static int esp_init_authenc(struct xfrm_state *x)
1051 struct crypto_aead *aead;
1052 struct crypto_authenc_key_param *param;
1056 char authenc_name[CRYPTO_MAX_ALG_NAME];
1057 unsigned int keylen;
1064 err = -ENAMETOOLONG;
1066 if ((x->props.flags & XFRM_STATE_ESN)) {
1067 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
1068 "%s%sauthencesn(%s,%s)%s",
1069 x->geniv ?: "", x->geniv ? "(" : "",
1070 x->aalg ? x->aalg->alg_name : "digest_null",
1072 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
1075 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
1076 "%s%sauthenc(%s,%s)%s",
1077 x->geniv ?: "", x->geniv ? "(" : "",
1078 x->aalg ? x->aalg->alg_name : "digest_null",
1080 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
1084 aead = crypto_alloc_aead(authenc_name, 0, 0);
1085 err = PTR_ERR(aead);
1091 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
1092 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
1094 key = kmalloc(keylen, GFP_KERNEL);
1100 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1101 rta->rta_len = RTA_LENGTH(sizeof(*param));
1102 param = RTA_DATA(rta);
1103 p += RTA_SPACE(sizeof(*param));
1106 struct xfrm_algo_desc *aalg_desc;
1108 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
1109 p += (x->aalg->alg_key_len + 7) / 8;
1111 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
1115 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
1116 crypto_aead_authsize(aead)) {
1117 pr_info("ESP: %s digestsize %u != %hu\n",
1119 crypto_aead_authsize(aead),
1120 aalg_desc->uinfo.auth.icv_fullbits / 8);
1124 err = crypto_aead_setauthsize(
1125 aead, x->aalg->alg_trunc_len / 8);
1130 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
1131 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
1133 err = crypto_aead_setkey(aead, key, keylen);
1142 static int esp_init_state(struct xfrm_state *x)
1144 struct crypto_aead *aead;
1151 err = esp_init_aead(x);
1153 err = esp_init_authenc(x);
1160 x->props.header_len = sizeof(struct ip_esp_hdr) +
1161 crypto_aead_ivsize(aead);
1162 if (x->props.mode == XFRM_MODE_TUNNEL)
1163 x->props.header_len += sizeof(struct iphdr);
1164 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
1165 x->props.header_len += IPV4_BEET_PHMAXLEN;
1167 struct xfrm_encap_tmpl *encap = x->encap;
1169 switch (encap->encap_type) {
1173 case UDP_ENCAP_ESPINUDP:
1174 x->props.header_len += sizeof(struct udphdr);
1176 case UDP_ENCAP_ESPINUDP_NON_IKE:
1177 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
1179 #ifdef CONFIG_INET_ESPINTCP
1180 case TCP_ENCAP_ESPINTCP:
1181 /* only the length field, TCP encap is done by
1184 x->props.header_len += 2;
1190 align = ALIGN(crypto_aead_blocksize(aead), 4);
1191 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1197 static int esp4_rcv_cb(struct sk_buff *skb, int err)
1202 static const struct xfrm_type esp_type =
1204 .owner = THIS_MODULE,
1205 .proto = IPPROTO_ESP,
1206 .flags = XFRM_TYPE_REPLAY_PROT,
1207 .init_state = esp_init_state,
1208 .destructor = esp_destroy,
1210 .output = esp_output,
1213 static struct xfrm4_protocol esp4_protocol = {
1214 .handler = xfrm4_rcv,
1215 .input_handler = xfrm_input,
1216 .cb_handler = esp4_rcv_cb,
1217 .err_handler = esp4_err,
1221 static int __init esp4_init(void)
1223 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
1224 pr_info("%s: can't add xfrm type\n", __func__);
1227 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
1228 pr_info("%s: can't add protocol\n", __func__);
1229 xfrm_unregister_type(&esp_type, AF_INET);
1235 static void __exit esp4_fini(void)
1237 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
1238 pr_info("%s: can't remove protocol\n", __func__);
1239 xfrm_unregister_type(&esp_type, AF_INET);
1242 module_init(esp4_init);
1243 module_exit(esp4_fini);
1244 MODULE_LICENSE("GPL");
1245 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);