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]))
36 static u32 esp4_get_mtu(struct xfrm_state *x, int mtu);
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 esp_output_extra *extra = esp_tmp_extra(tmp);
101 struct crypto_aead *aead = x->data;
104 struct aead_request *req;
105 struct scatterlist *sg;
107 if (x->props.flags & XFRM_STATE_ESN)
108 extralen += sizeof(*extra);
110 extra = esp_tmp_extra(tmp);
111 iv = esp_tmp_iv(aead, tmp, extralen);
112 req = esp_tmp_req(aead, iv);
114 /* Unref skb_frag_pages in the src scatterlist if necessary.
115 * Skip the first sg which comes from skb->data.
117 if (req->src != req->dst)
118 for (sg = sg_next(req->src); sg; sg = sg_next(sg))
119 put_page(sg_page(sg));
122 static void esp_output_done(struct crypto_async_request *base, int err)
124 struct sk_buff *skb = base->data;
125 struct xfrm_offload *xo = xfrm_offload(skb);
127 struct xfrm_state *x;
129 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
130 struct sec_path *sp = skb_sec_path(skb);
132 x = sp->xvec[sp->len - 1];
134 x = skb_dst(skb)->xfrm;
137 tmp = ESP_SKB_CB(skb)->tmp;
138 esp_ssg_unref(x, tmp);
141 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
143 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
148 skb_push(skb, skb->data - skb_mac_header(skb));
150 xfrm_dev_resume(skb);
152 xfrm_output_resume(skb, err);
156 /* Move ESP header back into place. */
157 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
159 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
160 void *tmp = ESP_SKB_CB(skb)->tmp;
161 __be32 *seqhi = esp_tmp_extra(tmp);
163 esph->seq_no = esph->spi;
167 static void esp_output_restore_header(struct sk_buff *skb)
169 void *tmp = ESP_SKB_CB(skb)->tmp;
170 struct esp_output_extra *extra = esp_tmp_extra(tmp);
172 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
176 static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
177 struct xfrm_state *x,
178 struct ip_esp_hdr *esph,
179 struct esp_output_extra *extra)
181 /* For ESN we move the header forward by 4 bytes to
182 * accomodate the high bits. We will move it back after
185 if ((x->props.flags & XFRM_STATE_ESN)) {
187 struct xfrm_offload *xo = xfrm_offload(skb);
192 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
194 extra->esphoff = (unsigned char *)esph -
195 skb_transport_header(skb);
196 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
197 extra->seqhi = esph->spi;
198 esph->seq_no = htonl(seqhi);
201 esph->spi = x->id.spi;
206 static void esp_output_done_esn(struct crypto_async_request *base, int err)
208 struct sk_buff *skb = base->data;
210 esp_output_restore_header(skb);
211 esp_output_done(base, err);
214 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
216 /* Fill padding... */
218 memset(tail, 0, tfclen);
223 for (i = 0; i < plen - 2; i++)
226 tail[plen - 2] = plen - 2;
227 tail[plen - 1] = proto;
230 static int esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
236 struct xfrm_encap_tmpl *encap = x->encap;
237 struct ip_esp_hdr *esph = esp->esph;
240 spin_lock_bh(&x->lock);
241 sport = encap->encap_sport;
242 dport = encap->encap_dport;
243 encap_type = encap->encap_type;
244 spin_unlock_bh(&x->lock);
246 len = skb->len + esp->tailen - skb_transport_offset(skb);
247 if (len + sizeof(struct iphdr) >= IP_MAX_MTU)
250 uh = (struct udphdr *)esph;
253 uh->len = htons(len);
256 switch (encap_type) {
258 case UDP_ENCAP_ESPINUDP:
259 esph = (struct ip_esp_hdr *)(uh + 1);
261 case UDP_ENCAP_ESPINUDP_NON_IKE:
262 udpdata32 = (__be32 *)(uh + 1);
263 udpdata32[0] = udpdata32[1] = 0;
264 esph = (struct ip_esp_hdr *)(udpdata32 + 2);
268 *skb_mac_header(skb) = IPPROTO_UDP;
274 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
281 struct sk_buff *trailer;
282 int tailen = esp->tailen;
284 /* this is non-NULL only with UDP Encapsulation */
286 int err = esp_output_udp_encap(x, skb, esp);
292 if (!skb_cloned(skb)) {
293 if (tailen <= skb_tailroom(skb)) {
296 tail = skb_tail_pointer(trailer);
299 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
300 && !skb_has_frag_list(skb)) {
302 struct sock *sk = skb->sk;
303 struct page_frag *pfrag = &x->xfrag;
305 esp->inplace = false;
307 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
309 spin_lock_bh(&x->lock);
311 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
312 spin_unlock_bh(&x->lock);
319 vaddr = kmap_atomic(page);
321 tail = vaddr + pfrag->offset;
323 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
325 kunmap_atomic(vaddr);
327 nfrags = skb_shinfo(skb)->nr_frags;
329 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
331 skb_shinfo(skb)->nr_frags = ++nfrags;
333 pfrag->offset = pfrag->offset + allocsize;
335 spin_unlock_bh(&x->lock);
340 skb->data_len += tailen;
341 skb->truesize += tailen;
342 if (sk && sk_fullsock(sk))
343 refcount_add(tailen, &sk->sk_wmem_alloc);
350 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
352 nfrags = skb_cow_data(skb, tailen, &trailer);
355 tail = skb_tail_pointer(trailer);
356 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
359 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
360 pskb_put(skb, trailer, tailen);
365 EXPORT_SYMBOL_GPL(esp_output_head);
367 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
376 struct ip_esp_hdr *esph;
377 struct crypto_aead *aead;
378 struct aead_request *req;
379 struct scatterlist *sg, *dsg;
380 struct esp_output_extra *extra;
383 assoclen = sizeof(struct ip_esp_hdr);
386 if (x->props.flags & XFRM_STATE_ESN) {
387 extralen += sizeof(*extra);
388 assoclen += sizeof(__be32);
392 alen = crypto_aead_authsize(aead);
393 ivlen = crypto_aead_ivsize(aead);
395 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
399 extra = esp_tmp_extra(tmp);
400 iv = esp_tmp_iv(aead, tmp, extralen);
401 req = esp_tmp_req(aead, iv);
402 sg = esp_req_sg(aead, req);
407 dsg = &sg[esp->nfrags];
409 esph = esp_output_set_extra(skb, x, esp->esph, extra);
412 sg_init_table(sg, esp->nfrags);
413 err = skb_to_sgvec(skb, sg,
414 (unsigned char *)esph - skb->data,
415 assoclen + ivlen + esp->clen + alen);
416 if (unlikely(err < 0))
421 struct page_frag *pfrag = &x->xfrag;
423 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
425 spin_lock_bh(&x->lock);
426 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
427 spin_unlock_bh(&x->lock);
431 skb_shinfo(skb)->nr_frags = 1;
435 /* replace page frags in skb with new page */
436 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
437 pfrag->offset = pfrag->offset + allocsize;
438 spin_unlock_bh(&x->lock);
440 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
441 err = skb_to_sgvec(skb, dsg,
442 (unsigned char *)esph - skb->data,
443 assoclen + ivlen + esp->clen + alen);
444 if (unlikely(err < 0))
448 if ((x->props.flags & XFRM_STATE_ESN))
449 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
451 aead_request_set_callback(req, 0, esp_output_done, skb);
453 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
454 aead_request_set_ad(req, assoclen);
456 memset(iv, 0, ivlen);
457 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
460 ESP_SKB_CB(skb)->tmp = tmp;
461 err = crypto_aead_encrypt(req);
472 if ((x->props.flags & XFRM_STATE_ESN))
473 esp_output_restore_header(skb);
477 esp_ssg_unref(x, tmp);
484 EXPORT_SYMBOL_GPL(esp_output_tail);
486 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
490 struct ip_esp_hdr *esph;
491 struct crypto_aead *aead;
496 esp.proto = *skb_mac_header(skb);
497 *skb_mac_header(skb) = IPPROTO_ESP;
499 /* skb is pure payload to encrypt */
502 alen = crypto_aead_authsize(aead);
506 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
509 padto = min(x->tfcpad, esp4_get_mtu(x, dst->child_mtu_cached));
510 if (skb->len < padto)
511 esp.tfclen = padto - skb->len;
513 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
514 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
515 esp.plen = esp.clen - skb->len - esp.tfclen;
516 esp.tailen = esp.tfclen + esp.plen + alen;
518 esp.esph = ip_esp_hdr(skb);
520 esp.nfrags = esp_output_head(x, skb, &esp);
525 esph->spi = x->id.spi;
527 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
528 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
529 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
531 skb_push(skb, -skb_network_offset(skb));
533 return esp_output_tail(x, skb, &esp);
536 static inline int esp_remove_trailer(struct sk_buff *skb)
538 struct xfrm_state *x = xfrm_input_state(skb);
539 struct xfrm_offload *xo = xfrm_offload(skb);
540 struct crypto_aead *aead = x->data;
541 int alen, hlen, elen;
547 alen = crypto_aead_authsize(aead);
548 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
549 elen = skb->len - hlen;
551 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
556 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
561 if (padlen + 2 + alen >= elen) {
562 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
563 padlen + 2, elen - alen);
567 trimlen = alen + padlen + 2;
568 if (skb->ip_summed == CHECKSUM_COMPLETE) {
569 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
570 skb->csum = csum_block_sub(skb->csum, csumdiff,
573 pskb_trim(skb, skb->len - trimlen);
581 int esp_input_done2(struct sk_buff *skb, int err)
583 const struct iphdr *iph;
584 struct xfrm_state *x = xfrm_input_state(skb);
585 struct xfrm_offload *xo = xfrm_offload(skb);
586 struct crypto_aead *aead = x->data;
587 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
590 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
591 kfree(ESP_SKB_CB(skb)->tmp);
596 err = esp_remove_trailer(skb);
597 if (unlikely(err < 0))
604 struct xfrm_encap_tmpl *encap = x->encap;
605 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
608 * 1) if the NAT-T peer's IP or port changed then
609 * advertize the change to the keying daemon.
610 * This is an inbound SA, so just compare
613 if (iph->saddr != x->props.saddr.a4 ||
614 uh->source != encap->encap_sport) {
615 xfrm_address_t ipaddr;
617 ipaddr.a4 = iph->saddr;
618 km_new_mapping(x, &ipaddr, uh->source);
620 /* XXX: perhaps add an extra
621 * policy check here, to see
622 * if we should allow or
623 * reject a packet from a
630 * 2) ignore UDP/TCP checksums in case
631 * of NAT-T in Transport Mode, or
632 * perform other post-processing fixes
633 * as per draft-ietf-ipsec-udp-encaps-06,
636 if (x->props.mode == XFRM_MODE_TRANSPORT)
637 skb->ip_summed = CHECKSUM_UNNECESSARY;
640 skb_pull_rcsum(skb, hlen);
641 if (x->props.mode == XFRM_MODE_TUNNEL)
642 skb_reset_transport_header(skb);
644 skb_set_transport_header(skb, -ihl);
646 /* RFC4303: Drop dummy packets without any error */
647 if (err == IPPROTO_NONE)
653 EXPORT_SYMBOL_GPL(esp_input_done2);
655 static void esp_input_done(struct crypto_async_request *base, int err)
657 struct sk_buff *skb = base->data;
659 xfrm_input_resume(skb, esp_input_done2(skb, err));
662 static void esp_input_restore_header(struct sk_buff *skb)
664 esp_restore_header(skb, 0);
668 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
670 struct xfrm_state *x = xfrm_input_state(skb);
671 struct ip_esp_hdr *esph;
673 /* For ESN we move the header forward by 4 bytes to
674 * accomodate the high bits. We will move it back after
677 if ((x->props.flags & XFRM_STATE_ESN)) {
678 esph = skb_push(skb, 4);
680 esph->spi = esph->seq_no;
681 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
685 static void esp_input_done_esn(struct crypto_async_request *base, int err)
687 struct sk_buff *skb = base->data;
689 esp_input_restore_header(skb);
690 esp_input_done(base, err);
694 * Note: detecting truncated vs. non-truncated authentication data is very
695 * expensive, so we only support truncated data, which is the recommended
698 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
700 struct crypto_aead *aead = x->data;
701 struct aead_request *req;
702 struct sk_buff *trailer;
703 int ivlen = crypto_aead_ivsize(aead);
704 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
711 struct scatterlist *sg;
714 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
720 assoclen = sizeof(struct ip_esp_hdr);
723 if (x->props.flags & XFRM_STATE_ESN) {
724 seqhilen += sizeof(__be32);
725 assoclen += seqhilen;
728 if (!skb_cloned(skb)) {
729 if (!skb_is_nonlinear(skb)) {
733 } else if (!skb_has_frag_list(skb)) {
734 nfrags = skb_shinfo(skb)->nr_frags;
741 err = skb_cow_data(skb, 0, &trailer);
749 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
753 ESP_SKB_CB(skb)->tmp = tmp;
754 seqhi = esp_tmp_extra(tmp);
755 iv = esp_tmp_iv(aead, tmp, seqhilen);
756 req = esp_tmp_req(aead, iv);
757 sg = esp_req_sg(aead, req);
759 esp_input_set_header(skb, seqhi);
761 sg_init_table(sg, nfrags);
762 err = skb_to_sgvec(skb, sg, 0, skb->len);
763 if (unlikely(err < 0)) {
768 skb->ip_summed = CHECKSUM_NONE;
770 if ((x->props.flags & XFRM_STATE_ESN))
771 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
773 aead_request_set_callback(req, 0, esp_input_done, skb);
775 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
776 aead_request_set_ad(req, assoclen);
778 err = crypto_aead_decrypt(req);
779 if (err == -EINPROGRESS)
782 if ((x->props.flags & XFRM_STATE_ESN))
783 esp_input_restore_header(skb);
785 err = esp_input_done2(skb, err);
791 static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
793 struct crypto_aead *aead = x->data;
794 u32 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
795 unsigned int net_adj;
797 switch (x->props.mode) {
798 case XFRM_MODE_TRANSPORT:
800 net_adj = sizeof(struct iphdr);
802 case XFRM_MODE_TUNNEL:
809 return ((mtu - x->props.header_len - crypto_aead_authsize(aead) -
810 net_adj) & ~(blksize - 1)) + net_adj - 2;
813 static int esp4_err(struct sk_buff *skb, u32 info)
815 struct net *net = dev_net(skb->dev);
816 const struct iphdr *iph = (const struct iphdr *)skb->data;
817 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
818 struct xfrm_state *x;
820 switch (icmp_hdr(skb)->type) {
821 case ICMP_DEST_UNREACH:
822 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
830 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
831 esph->spi, IPPROTO_ESP, AF_INET);
835 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
836 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
838 ipv4_redirect(skb, net, 0, IPPROTO_ESP);
844 static void esp_destroy(struct xfrm_state *x)
846 struct crypto_aead *aead = x->data;
851 crypto_free_aead(aead);
854 static int esp_init_aead(struct xfrm_state *x)
856 char aead_name[CRYPTO_MAX_ALG_NAME];
857 struct crypto_aead *aead;
861 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
862 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
865 aead = crypto_alloc_aead(aead_name, 0, 0);
872 err = crypto_aead_setkey(aead, x->aead->alg_key,
873 (x->aead->alg_key_len + 7) / 8);
877 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
885 static int esp_init_authenc(struct xfrm_state *x)
887 struct crypto_aead *aead;
888 struct crypto_authenc_key_param *param;
892 char authenc_name[CRYPTO_MAX_ALG_NAME];
902 if ((x->props.flags & XFRM_STATE_ESN)) {
903 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
904 "%s%sauthencesn(%s,%s)%s",
905 x->geniv ?: "", x->geniv ? "(" : "",
906 x->aalg ? x->aalg->alg_name : "digest_null",
908 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
911 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
912 "%s%sauthenc(%s,%s)%s",
913 x->geniv ?: "", x->geniv ? "(" : "",
914 x->aalg ? x->aalg->alg_name : "digest_null",
916 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
920 aead = crypto_alloc_aead(authenc_name, 0, 0);
927 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
928 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
930 key = kmalloc(keylen, GFP_KERNEL);
936 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
937 rta->rta_len = RTA_LENGTH(sizeof(*param));
938 param = RTA_DATA(rta);
939 p += RTA_SPACE(sizeof(*param));
942 struct xfrm_algo_desc *aalg_desc;
944 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
945 p += (x->aalg->alg_key_len + 7) / 8;
947 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
951 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
952 crypto_aead_authsize(aead)) {
953 pr_info("ESP: %s digestsize %u != %hu\n",
955 crypto_aead_authsize(aead),
956 aalg_desc->uinfo.auth.icv_fullbits / 8);
960 err = crypto_aead_setauthsize(
961 aead, x->aalg->alg_trunc_len / 8);
966 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
967 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
969 err = crypto_aead_setkey(aead, key, keylen);
978 static int esp_init_state(struct xfrm_state *x)
980 struct crypto_aead *aead;
987 err = esp_init_aead(x);
989 err = esp_init_authenc(x);
996 x->props.header_len = sizeof(struct ip_esp_hdr) +
997 crypto_aead_ivsize(aead);
998 if (x->props.mode == XFRM_MODE_TUNNEL)
999 x->props.header_len += sizeof(struct iphdr);
1000 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
1001 x->props.header_len += IPV4_BEET_PHMAXLEN;
1003 struct xfrm_encap_tmpl *encap = x->encap;
1005 switch (encap->encap_type) {
1009 case UDP_ENCAP_ESPINUDP:
1010 x->props.header_len += sizeof(struct udphdr);
1012 case UDP_ENCAP_ESPINUDP_NON_IKE:
1013 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
1018 align = ALIGN(crypto_aead_blocksize(aead), 4);
1019 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1025 static int esp4_rcv_cb(struct sk_buff *skb, int err)
1030 static const struct xfrm_type esp_type =
1032 .description = "ESP4",
1033 .owner = THIS_MODULE,
1034 .proto = IPPROTO_ESP,
1035 .flags = XFRM_TYPE_REPLAY_PROT,
1036 .init_state = esp_init_state,
1037 .destructor = esp_destroy,
1038 .get_mtu = esp4_get_mtu,
1040 .output = esp_output,
1043 static struct xfrm4_protocol esp4_protocol = {
1044 .handler = xfrm4_rcv,
1045 .input_handler = xfrm_input,
1046 .cb_handler = esp4_rcv_cb,
1047 .err_handler = esp4_err,
1051 static int __init esp4_init(void)
1053 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
1054 pr_info("%s: can't add xfrm type\n", __func__);
1057 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
1058 pr_info("%s: can't add protocol\n", __func__);
1059 xfrm_unregister_type(&esp_type, AF_INET);
1065 static void __exit esp4_fini(void)
1067 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
1068 pr_info("%s: can't remove protocol\n", __func__);
1069 if (xfrm_unregister_type(&esp_type, AF_INET) < 0)
1070 pr_info("%s: can't remove xfrm type\n", __func__);
1073 module_init(esp4_init);
1074 module_exit(esp4_fini);
1075 MODULE_LICENSE("GPL");
1076 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);