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 <linux/highmem.h>
25 struct xfrm_skb_cb xfrm;
29 struct esp_output_extra {
34 #define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
37 * Allocate an AEAD request structure with extra space for SG and IV.
39 * For alignment considerations the IV is placed at the front, followed
40 * by the request and finally the SG list.
42 * TODO: Use spare space in skb for this where possible.
44 static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen)
50 len += crypto_aead_ivsize(aead);
53 len += crypto_aead_alignmask(aead) &
54 ~(crypto_tfm_ctx_alignment() - 1);
55 len = ALIGN(len, crypto_tfm_ctx_alignment());
58 len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
59 len = ALIGN(len, __alignof__(struct scatterlist));
61 len += sizeof(struct scatterlist) * nfrags;
63 return kmalloc(len, GFP_ATOMIC);
66 static inline void *esp_tmp_extra(void *tmp)
68 return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra));
71 static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen)
73 return crypto_aead_ivsize(aead) ?
74 PTR_ALIGN((u8 *)tmp + extralen,
75 crypto_aead_alignmask(aead) + 1) : tmp + extralen;
78 static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
80 struct aead_request *req;
82 req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
83 crypto_tfm_ctx_alignment());
84 aead_request_set_tfm(req, aead);
88 static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
89 struct aead_request *req)
91 return (void *)ALIGN((unsigned long)(req + 1) +
92 crypto_aead_reqsize(aead),
93 __alignof__(struct scatterlist));
96 static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
98 struct esp_output_extra *extra = esp_tmp_extra(tmp);
99 struct crypto_aead *aead = x->data;
102 struct aead_request *req;
103 struct scatterlist *sg;
105 if (x->props.flags & XFRM_STATE_ESN)
106 extralen += sizeof(*extra);
108 extra = esp_tmp_extra(tmp);
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 static void esp_output_done(struct crypto_async_request *base, int err)
122 struct sk_buff *skb = base->data;
123 struct xfrm_offload *xo = xfrm_offload(skb);
125 struct xfrm_state *x;
127 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
128 struct sec_path *sp = skb_sec_path(skb);
130 x = sp->xvec[sp->len - 1];
132 x = skb_dst(skb)->xfrm;
135 tmp = ESP_SKB_CB(skb)->tmp;
136 esp_ssg_unref(x, tmp);
139 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
141 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
146 skb_push(skb, skb->data - skb_mac_header(skb));
148 xfrm_dev_resume(skb);
150 xfrm_output_resume(skb, err);
154 /* Move ESP header back into place. */
155 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
157 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
158 void *tmp = ESP_SKB_CB(skb)->tmp;
159 __be32 *seqhi = esp_tmp_extra(tmp);
161 esph->seq_no = esph->spi;
165 static void esp_output_restore_header(struct sk_buff *skb)
167 void *tmp = ESP_SKB_CB(skb)->tmp;
168 struct esp_output_extra *extra = esp_tmp_extra(tmp);
170 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
174 static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
175 struct xfrm_state *x,
176 struct ip_esp_hdr *esph,
177 struct esp_output_extra *extra)
179 /* For ESN we move the header forward by 4 bytes to
180 * accomodate the high bits. We will move it back after
183 if ((x->props.flags & XFRM_STATE_ESN)) {
185 struct xfrm_offload *xo = xfrm_offload(skb);
190 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
192 extra->esphoff = (unsigned char *)esph -
193 skb_transport_header(skb);
194 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
195 extra->seqhi = esph->spi;
196 esph->seq_no = htonl(seqhi);
199 esph->spi = x->id.spi;
204 static void esp_output_done_esn(struct crypto_async_request *base, int err)
206 struct sk_buff *skb = base->data;
208 esp_output_restore_header(skb);
209 esp_output_done(base, err);
212 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
214 /* Fill padding... */
216 memset(tail, 0, tfclen);
221 for (i = 0; i < plen - 2; i++)
224 tail[plen - 2] = plen - 2;
225 tail[plen - 1] = proto;
228 static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
230 struct esp_info *esp,
238 len = skb->len + esp->tailen - skb_transport_offset(skb);
239 if (len + sizeof(struct iphdr) >= IP_MAX_MTU)
240 return ERR_PTR(-EMSGSIZE);
242 uh = (struct udphdr *)esp->esph;
245 uh->len = htons(len);
248 *skb_mac_header(skb) = IPPROTO_UDP;
250 if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
251 udpdata32 = (__be32 *)(uh + 1);
252 udpdata32[0] = udpdata32[1] = 0;
253 return (struct ip_esp_hdr *)(udpdata32 + 2);
256 return (struct ip_esp_hdr *)(uh + 1);
259 static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
260 struct esp_info *esp)
262 struct xfrm_encap_tmpl *encap = x->encap;
263 struct ip_esp_hdr *esph;
267 spin_lock_bh(&x->lock);
268 sport = encap->encap_sport;
269 dport = encap->encap_dport;
270 encap_type = encap->encap_type;
271 spin_unlock_bh(&x->lock);
273 switch (encap_type) {
275 case UDP_ENCAP_ESPINUDP:
276 case UDP_ENCAP_ESPINUDP_NON_IKE:
277 esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
282 return PTR_ERR(esph);
289 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
296 struct sk_buff *trailer;
297 int tailen = esp->tailen;
299 /* this is non-NULL only with UDP Encapsulation */
301 int err = esp_output_encap(x, skb, esp);
307 if (!skb_cloned(skb)) {
308 if (tailen <= skb_tailroom(skb)) {
311 tail = skb_tail_pointer(trailer);
314 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
315 && !skb_has_frag_list(skb)) {
317 struct sock *sk = skb->sk;
318 struct page_frag *pfrag = &x->xfrag;
320 esp->inplace = false;
322 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
324 spin_lock_bh(&x->lock);
326 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
327 spin_unlock_bh(&x->lock);
334 vaddr = kmap_atomic(page);
336 tail = vaddr + pfrag->offset;
338 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
340 kunmap_atomic(vaddr);
342 nfrags = skb_shinfo(skb)->nr_frags;
344 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
346 skb_shinfo(skb)->nr_frags = ++nfrags;
348 pfrag->offset = pfrag->offset + allocsize;
350 spin_unlock_bh(&x->lock);
355 skb->data_len += tailen;
356 skb->truesize += tailen;
357 if (sk && sk_fullsock(sk))
358 refcount_add(tailen, &sk->sk_wmem_alloc);
365 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
367 nfrags = skb_cow_data(skb, tailen, &trailer);
370 tail = skb_tail_pointer(trailer);
371 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
374 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
375 pskb_put(skb, trailer, tailen);
380 EXPORT_SYMBOL_GPL(esp_output_head);
382 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
391 struct ip_esp_hdr *esph;
392 struct crypto_aead *aead;
393 struct aead_request *req;
394 struct scatterlist *sg, *dsg;
395 struct esp_output_extra *extra;
398 assoclen = sizeof(struct ip_esp_hdr);
401 if (x->props.flags & XFRM_STATE_ESN) {
402 extralen += sizeof(*extra);
403 assoclen += sizeof(__be32);
407 alen = crypto_aead_authsize(aead);
408 ivlen = crypto_aead_ivsize(aead);
410 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
414 extra = esp_tmp_extra(tmp);
415 iv = esp_tmp_iv(aead, tmp, extralen);
416 req = esp_tmp_req(aead, iv);
417 sg = esp_req_sg(aead, req);
422 dsg = &sg[esp->nfrags];
424 esph = esp_output_set_extra(skb, x, esp->esph, extra);
427 sg_init_table(sg, esp->nfrags);
428 err = skb_to_sgvec(skb, sg,
429 (unsigned char *)esph - skb->data,
430 assoclen + ivlen + esp->clen + alen);
431 if (unlikely(err < 0))
436 struct page_frag *pfrag = &x->xfrag;
438 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
440 spin_lock_bh(&x->lock);
441 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
442 spin_unlock_bh(&x->lock);
446 skb_shinfo(skb)->nr_frags = 1;
450 /* replace page frags in skb with new page */
451 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
452 pfrag->offset = pfrag->offset + allocsize;
453 spin_unlock_bh(&x->lock);
455 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
456 err = skb_to_sgvec(skb, dsg,
457 (unsigned char *)esph - skb->data,
458 assoclen + ivlen + esp->clen + alen);
459 if (unlikely(err < 0))
463 if ((x->props.flags & XFRM_STATE_ESN))
464 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
466 aead_request_set_callback(req, 0, esp_output_done, skb);
468 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
469 aead_request_set_ad(req, assoclen);
471 memset(iv, 0, ivlen);
472 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
475 ESP_SKB_CB(skb)->tmp = tmp;
476 err = crypto_aead_encrypt(req);
487 if ((x->props.flags & XFRM_STATE_ESN))
488 esp_output_restore_header(skb);
492 esp_ssg_unref(x, tmp);
499 EXPORT_SYMBOL_GPL(esp_output_tail);
501 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
505 struct ip_esp_hdr *esph;
506 struct crypto_aead *aead;
511 esp.proto = *skb_mac_header(skb);
512 *skb_mac_header(skb) = IPPROTO_ESP;
514 /* skb is pure payload to encrypt */
517 alen = crypto_aead_authsize(aead);
521 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
524 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
525 if (skb->len < padto)
526 esp.tfclen = padto - skb->len;
528 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
529 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
530 esp.plen = esp.clen - skb->len - esp.tfclen;
531 esp.tailen = esp.tfclen + esp.plen + alen;
533 esp.esph = ip_esp_hdr(skb);
535 esp.nfrags = esp_output_head(x, skb, &esp);
540 esph->spi = x->id.spi;
542 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
543 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
544 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
546 skb_push(skb, -skb_network_offset(skb));
548 return esp_output_tail(x, skb, &esp);
551 static inline int esp_remove_trailer(struct sk_buff *skb)
553 struct xfrm_state *x = xfrm_input_state(skb);
554 struct xfrm_offload *xo = xfrm_offload(skb);
555 struct crypto_aead *aead = x->data;
556 int alen, hlen, elen;
562 alen = crypto_aead_authsize(aead);
563 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
564 elen = skb->len - hlen;
566 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
571 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
576 if (padlen + 2 + alen >= elen) {
577 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
578 padlen + 2, elen - alen);
582 trimlen = alen + padlen + 2;
583 if (skb->ip_summed == CHECKSUM_COMPLETE) {
584 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
585 skb->csum = csum_block_sub(skb->csum, csumdiff,
588 pskb_trim(skb, skb->len - trimlen);
596 int esp_input_done2(struct sk_buff *skb, int err)
598 const struct iphdr *iph;
599 struct xfrm_state *x = xfrm_input_state(skb);
600 struct xfrm_offload *xo = xfrm_offload(skb);
601 struct crypto_aead *aead = x->data;
602 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
605 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
606 kfree(ESP_SKB_CB(skb)->tmp);
611 err = esp_remove_trailer(skb);
612 if (unlikely(err < 0))
619 struct xfrm_encap_tmpl *encap = x->encap;
620 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
623 switch (x->encap->encap_type) {
624 case UDP_ENCAP_ESPINUDP:
625 case UDP_ENCAP_ESPINUDP_NON_IKE:
635 * 1) if the NAT-T peer's IP or port changed then
636 * advertize the change to the keying daemon.
637 * This is an inbound SA, so just compare
640 if (iph->saddr != x->props.saddr.a4 ||
641 source != encap->encap_sport) {
642 xfrm_address_t ipaddr;
644 ipaddr.a4 = iph->saddr;
645 km_new_mapping(x, &ipaddr, source);
647 /* XXX: perhaps add an extra
648 * policy check here, to see
649 * if we should allow or
650 * reject a packet from a
657 * 2) ignore UDP/TCP checksums in case
658 * of NAT-T in Transport Mode, or
659 * perform other post-processing fixes
660 * as per draft-ietf-ipsec-udp-encaps-06,
663 if (x->props.mode == XFRM_MODE_TRANSPORT)
664 skb->ip_summed = CHECKSUM_UNNECESSARY;
667 skb_pull_rcsum(skb, hlen);
668 if (x->props.mode == XFRM_MODE_TUNNEL)
669 skb_reset_transport_header(skb);
671 skb_set_transport_header(skb, -ihl);
673 /* RFC4303: Drop dummy packets without any error */
674 if (err == IPPROTO_NONE)
680 EXPORT_SYMBOL_GPL(esp_input_done2);
682 static void esp_input_done(struct crypto_async_request *base, int err)
684 struct sk_buff *skb = base->data;
686 xfrm_input_resume(skb, esp_input_done2(skb, err));
689 static void esp_input_restore_header(struct sk_buff *skb)
691 esp_restore_header(skb, 0);
695 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
697 struct xfrm_state *x = xfrm_input_state(skb);
698 struct ip_esp_hdr *esph;
700 /* For ESN we move the header forward by 4 bytes to
701 * accomodate the high bits. We will move it back after
704 if ((x->props.flags & XFRM_STATE_ESN)) {
705 esph = skb_push(skb, 4);
707 esph->spi = esph->seq_no;
708 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
712 static void esp_input_done_esn(struct crypto_async_request *base, int err)
714 struct sk_buff *skb = base->data;
716 esp_input_restore_header(skb);
717 esp_input_done(base, err);
721 * Note: detecting truncated vs. non-truncated authentication data is very
722 * expensive, so we only support truncated data, which is the recommended
725 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
727 struct crypto_aead *aead = x->data;
728 struct aead_request *req;
729 struct sk_buff *trailer;
730 int ivlen = crypto_aead_ivsize(aead);
731 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
738 struct scatterlist *sg;
741 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
747 assoclen = sizeof(struct ip_esp_hdr);
750 if (x->props.flags & XFRM_STATE_ESN) {
751 seqhilen += sizeof(__be32);
752 assoclen += seqhilen;
755 if (!skb_cloned(skb)) {
756 if (!skb_is_nonlinear(skb)) {
760 } else if (!skb_has_frag_list(skb)) {
761 nfrags = skb_shinfo(skb)->nr_frags;
768 err = skb_cow_data(skb, 0, &trailer);
776 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
780 ESP_SKB_CB(skb)->tmp = tmp;
781 seqhi = esp_tmp_extra(tmp);
782 iv = esp_tmp_iv(aead, tmp, seqhilen);
783 req = esp_tmp_req(aead, iv);
784 sg = esp_req_sg(aead, req);
786 esp_input_set_header(skb, seqhi);
788 sg_init_table(sg, nfrags);
789 err = skb_to_sgvec(skb, sg, 0, skb->len);
790 if (unlikely(err < 0)) {
795 skb->ip_summed = CHECKSUM_NONE;
797 if ((x->props.flags & XFRM_STATE_ESN))
798 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
800 aead_request_set_callback(req, 0, esp_input_done, skb);
802 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
803 aead_request_set_ad(req, assoclen);
805 err = crypto_aead_decrypt(req);
806 if (err == -EINPROGRESS)
809 if ((x->props.flags & XFRM_STATE_ESN))
810 esp_input_restore_header(skb);
812 err = esp_input_done2(skb, err);
818 static int esp4_err(struct sk_buff *skb, u32 info)
820 struct net *net = dev_net(skb->dev);
821 const struct iphdr *iph = (const struct iphdr *)skb->data;
822 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
823 struct xfrm_state *x;
825 switch (icmp_hdr(skb)->type) {
826 case ICMP_DEST_UNREACH:
827 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
835 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
836 esph->spi, IPPROTO_ESP, AF_INET);
840 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
841 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
843 ipv4_redirect(skb, net, 0, IPPROTO_ESP);
849 static void esp_destroy(struct xfrm_state *x)
851 struct crypto_aead *aead = x->data;
856 crypto_free_aead(aead);
859 static int esp_init_aead(struct xfrm_state *x)
861 char aead_name[CRYPTO_MAX_ALG_NAME];
862 struct crypto_aead *aead;
866 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
867 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
870 aead = crypto_alloc_aead(aead_name, 0, 0);
877 err = crypto_aead_setkey(aead, x->aead->alg_key,
878 (x->aead->alg_key_len + 7) / 8);
882 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
890 static int esp_init_authenc(struct xfrm_state *x)
892 struct crypto_aead *aead;
893 struct crypto_authenc_key_param *param;
897 char authenc_name[CRYPTO_MAX_ALG_NAME];
907 if ((x->props.flags & XFRM_STATE_ESN)) {
908 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
909 "%s%sauthencesn(%s,%s)%s",
910 x->geniv ?: "", x->geniv ? "(" : "",
911 x->aalg ? x->aalg->alg_name : "digest_null",
913 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
916 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
917 "%s%sauthenc(%s,%s)%s",
918 x->geniv ?: "", x->geniv ? "(" : "",
919 x->aalg ? x->aalg->alg_name : "digest_null",
921 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
925 aead = crypto_alloc_aead(authenc_name, 0, 0);
932 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
933 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
935 key = kmalloc(keylen, GFP_KERNEL);
941 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
942 rta->rta_len = RTA_LENGTH(sizeof(*param));
943 param = RTA_DATA(rta);
944 p += RTA_SPACE(sizeof(*param));
947 struct xfrm_algo_desc *aalg_desc;
949 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
950 p += (x->aalg->alg_key_len + 7) / 8;
952 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
956 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
957 crypto_aead_authsize(aead)) {
958 pr_info("ESP: %s digestsize %u != %hu\n",
960 crypto_aead_authsize(aead),
961 aalg_desc->uinfo.auth.icv_fullbits / 8);
965 err = crypto_aead_setauthsize(
966 aead, x->aalg->alg_trunc_len / 8);
971 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
972 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
974 err = crypto_aead_setkey(aead, key, keylen);
983 static int esp_init_state(struct xfrm_state *x)
985 struct crypto_aead *aead;
992 err = esp_init_aead(x);
994 err = esp_init_authenc(x);
1001 x->props.header_len = sizeof(struct ip_esp_hdr) +
1002 crypto_aead_ivsize(aead);
1003 if (x->props.mode == XFRM_MODE_TUNNEL)
1004 x->props.header_len += sizeof(struct iphdr);
1005 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
1006 x->props.header_len += IPV4_BEET_PHMAXLEN;
1008 struct xfrm_encap_tmpl *encap = x->encap;
1010 switch (encap->encap_type) {
1014 case UDP_ENCAP_ESPINUDP:
1015 x->props.header_len += sizeof(struct udphdr);
1017 case UDP_ENCAP_ESPINUDP_NON_IKE:
1018 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
1023 align = ALIGN(crypto_aead_blocksize(aead), 4);
1024 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1030 static int esp4_rcv_cb(struct sk_buff *skb, int err)
1035 static const struct xfrm_type esp_type =
1037 .description = "ESP4",
1038 .owner = THIS_MODULE,
1039 .proto = IPPROTO_ESP,
1040 .flags = XFRM_TYPE_REPLAY_PROT,
1041 .init_state = esp_init_state,
1042 .destructor = esp_destroy,
1044 .output = esp_output,
1047 static struct xfrm4_protocol esp4_protocol = {
1048 .handler = xfrm4_rcv,
1049 .input_handler = xfrm_input,
1050 .cb_handler = esp4_rcv_cb,
1051 .err_handler = esp4_err,
1055 static int __init esp4_init(void)
1057 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
1058 pr_info("%s: can't add xfrm type\n", __func__);
1061 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
1062 pr_info("%s: can't add protocol\n", __func__);
1063 xfrm_unregister_type(&esp_type, AF_INET);
1069 static void __exit esp4_fini(void)
1071 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
1072 pr_info("%s: can't remove protocol\n", __func__);
1073 xfrm_unregister_type(&esp_type, AF_INET);
1076 module_init(esp4_init);
1077 module_exit(esp4_fini);
1078 MODULE_LICENSE("GPL");
1079 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);