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 int esp_output_udp_encap(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
234 struct xfrm_encap_tmpl *encap = x->encap;
235 struct ip_esp_hdr *esph = esp->esph;
238 spin_lock_bh(&x->lock);
239 sport = encap->encap_sport;
240 dport = encap->encap_dport;
241 encap_type = encap->encap_type;
242 spin_unlock_bh(&x->lock);
244 len = skb->len + esp->tailen - skb_transport_offset(skb);
245 if (len + sizeof(struct iphdr) >= IP_MAX_MTU)
248 uh = (struct udphdr *)esph;
251 uh->len = htons(len);
254 switch (encap_type) {
256 case UDP_ENCAP_ESPINUDP:
257 esph = (struct ip_esp_hdr *)(uh + 1);
259 case UDP_ENCAP_ESPINUDP_NON_IKE:
260 udpdata32 = (__be32 *)(uh + 1);
261 udpdata32[0] = udpdata32[1] = 0;
262 esph = (struct ip_esp_hdr *)(udpdata32 + 2);
266 *skb_mac_header(skb) = IPPROTO_UDP;
272 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
279 struct sk_buff *trailer;
280 int tailen = esp->tailen;
282 /* this is non-NULL only with UDP Encapsulation */
284 int err = esp_output_udp_encap(x, skb, esp);
290 if (!skb_cloned(skb)) {
291 if (tailen <= skb_tailroom(skb)) {
294 tail = skb_tail_pointer(trailer);
297 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
298 && !skb_has_frag_list(skb)) {
300 struct sock *sk = skb->sk;
301 struct page_frag *pfrag = &x->xfrag;
303 esp->inplace = false;
305 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
307 spin_lock_bh(&x->lock);
309 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
310 spin_unlock_bh(&x->lock);
317 vaddr = kmap_atomic(page);
319 tail = vaddr + pfrag->offset;
321 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
323 kunmap_atomic(vaddr);
325 nfrags = skb_shinfo(skb)->nr_frags;
327 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
329 skb_shinfo(skb)->nr_frags = ++nfrags;
331 pfrag->offset = pfrag->offset + allocsize;
333 spin_unlock_bh(&x->lock);
338 skb->data_len += tailen;
339 skb->truesize += tailen;
340 if (sk && sk_fullsock(sk))
341 refcount_add(tailen, &sk->sk_wmem_alloc);
348 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
350 nfrags = skb_cow_data(skb, tailen, &trailer);
353 tail = skb_tail_pointer(trailer);
354 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
357 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
358 pskb_put(skb, trailer, tailen);
363 EXPORT_SYMBOL_GPL(esp_output_head);
365 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
374 struct ip_esp_hdr *esph;
375 struct crypto_aead *aead;
376 struct aead_request *req;
377 struct scatterlist *sg, *dsg;
378 struct esp_output_extra *extra;
381 assoclen = sizeof(struct ip_esp_hdr);
384 if (x->props.flags & XFRM_STATE_ESN) {
385 extralen += sizeof(*extra);
386 assoclen += sizeof(__be32);
390 alen = crypto_aead_authsize(aead);
391 ivlen = crypto_aead_ivsize(aead);
393 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
397 extra = esp_tmp_extra(tmp);
398 iv = esp_tmp_iv(aead, tmp, extralen);
399 req = esp_tmp_req(aead, iv);
400 sg = esp_req_sg(aead, req);
405 dsg = &sg[esp->nfrags];
407 esph = esp_output_set_extra(skb, x, esp->esph, extra);
410 sg_init_table(sg, esp->nfrags);
411 err = skb_to_sgvec(skb, sg,
412 (unsigned char *)esph - skb->data,
413 assoclen + ivlen + esp->clen + alen);
414 if (unlikely(err < 0))
419 struct page_frag *pfrag = &x->xfrag;
421 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
423 spin_lock_bh(&x->lock);
424 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
425 spin_unlock_bh(&x->lock);
429 skb_shinfo(skb)->nr_frags = 1;
433 /* replace page frags in skb with new page */
434 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
435 pfrag->offset = pfrag->offset + allocsize;
436 spin_unlock_bh(&x->lock);
438 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
439 err = skb_to_sgvec(skb, dsg,
440 (unsigned char *)esph - skb->data,
441 assoclen + ivlen + esp->clen + alen);
442 if (unlikely(err < 0))
446 if ((x->props.flags & XFRM_STATE_ESN))
447 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
449 aead_request_set_callback(req, 0, esp_output_done, skb);
451 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
452 aead_request_set_ad(req, assoclen);
454 memset(iv, 0, ivlen);
455 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
458 ESP_SKB_CB(skb)->tmp = tmp;
459 err = crypto_aead_encrypt(req);
470 if ((x->props.flags & XFRM_STATE_ESN))
471 esp_output_restore_header(skb);
475 esp_ssg_unref(x, tmp);
482 EXPORT_SYMBOL_GPL(esp_output_tail);
484 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
488 struct ip_esp_hdr *esph;
489 struct crypto_aead *aead;
494 esp.proto = *skb_mac_header(skb);
495 *skb_mac_header(skb) = IPPROTO_ESP;
497 /* skb is pure payload to encrypt */
500 alen = crypto_aead_authsize(aead);
504 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
507 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
508 if (skb->len < padto)
509 esp.tfclen = padto - skb->len;
511 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
512 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
513 esp.plen = esp.clen - skb->len - esp.tfclen;
514 esp.tailen = esp.tfclen + esp.plen + alen;
516 esp.esph = ip_esp_hdr(skb);
518 esp.nfrags = esp_output_head(x, skb, &esp);
523 esph->spi = x->id.spi;
525 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
526 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
527 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
529 skb_push(skb, -skb_network_offset(skb));
531 return esp_output_tail(x, skb, &esp);
534 static inline int esp_remove_trailer(struct sk_buff *skb)
536 struct xfrm_state *x = xfrm_input_state(skb);
537 struct xfrm_offload *xo = xfrm_offload(skb);
538 struct crypto_aead *aead = x->data;
539 int alen, hlen, elen;
545 alen = crypto_aead_authsize(aead);
546 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
547 elen = skb->len - hlen;
549 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
554 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
559 if (padlen + 2 + alen >= elen) {
560 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
561 padlen + 2, elen - alen);
565 trimlen = alen + padlen + 2;
566 if (skb->ip_summed == CHECKSUM_COMPLETE) {
567 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
568 skb->csum = csum_block_sub(skb->csum, csumdiff,
571 pskb_trim(skb, skb->len - trimlen);
579 int esp_input_done2(struct sk_buff *skb, int err)
581 const struct iphdr *iph;
582 struct xfrm_state *x = xfrm_input_state(skb);
583 struct xfrm_offload *xo = xfrm_offload(skb);
584 struct crypto_aead *aead = x->data;
585 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
588 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
589 kfree(ESP_SKB_CB(skb)->tmp);
594 err = esp_remove_trailer(skb);
595 if (unlikely(err < 0))
602 struct xfrm_encap_tmpl *encap = x->encap;
603 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
606 * 1) if the NAT-T peer's IP or port changed then
607 * advertize the change to the keying daemon.
608 * This is an inbound SA, so just compare
611 if (iph->saddr != x->props.saddr.a4 ||
612 uh->source != encap->encap_sport) {
613 xfrm_address_t ipaddr;
615 ipaddr.a4 = iph->saddr;
616 km_new_mapping(x, &ipaddr, uh->source);
618 /* XXX: perhaps add an extra
619 * policy check here, to see
620 * if we should allow or
621 * reject a packet from a
628 * 2) ignore UDP/TCP checksums in case
629 * of NAT-T in Transport Mode, or
630 * perform other post-processing fixes
631 * as per draft-ietf-ipsec-udp-encaps-06,
634 if (x->props.mode == XFRM_MODE_TRANSPORT)
635 skb->ip_summed = CHECKSUM_UNNECESSARY;
638 skb_pull_rcsum(skb, hlen);
639 if (x->props.mode == XFRM_MODE_TUNNEL)
640 skb_reset_transport_header(skb);
642 skb_set_transport_header(skb, -ihl);
644 /* RFC4303: Drop dummy packets without any error */
645 if (err == IPPROTO_NONE)
651 EXPORT_SYMBOL_GPL(esp_input_done2);
653 static void esp_input_done(struct crypto_async_request *base, int err)
655 struct sk_buff *skb = base->data;
657 xfrm_input_resume(skb, esp_input_done2(skb, err));
660 static void esp_input_restore_header(struct sk_buff *skb)
662 esp_restore_header(skb, 0);
666 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
668 struct xfrm_state *x = xfrm_input_state(skb);
669 struct ip_esp_hdr *esph;
671 /* For ESN we move the header forward by 4 bytes to
672 * accomodate the high bits. We will move it back after
675 if ((x->props.flags & XFRM_STATE_ESN)) {
676 esph = skb_push(skb, 4);
678 esph->spi = esph->seq_no;
679 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
683 static void esp_input_done_esn(struct crypto_async_request *base, int err)
685 struct sk_buff *skb = base->data;
687 esp_input_restore_header(skb);
688 esp_input_done(base, err);
692 * Note: detecting truncated vs. non-truncated authentication data is very
693 * expensive, so we only support truncated data, which is the recommended
696 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
698 struct crypto_aead *aead = x->data;
699 struct aead_request *req;
700 struct sk_buff *trailer;
701 int ivlen = crypto_aead_ivsize(aead);
702 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
709 struct scatterlist *sg;
712 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
718 assoclen = sizeof(struct ip_esp_hdr);
721 if (x->props.flags & XFRM_STATE_ESN) {
722 seqhilen += sizeof(__be32);
723 assoclen += seqhilen;
726 if (!skb_cloned(skb)) {
727 if (!skb_is_nonlinear(skb)) {
731 } else if (!skb_has_frag_list(skb)) {
732 nfrags = skb_shinfo(skb)->nr_frags;
739 err = skb_cow_data(skb, 0, &trailer);
747 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
751 ESP_SKB_CB(skb)->tmp = tmp;
752 seqhi = esp_tmp_extra(tmp);
753 iv = esp_tmp_iv(aead, tmp, seqhilen);
754 req = esp_tmp_req(aead, iv);
755 sg = esp_req_sg(aead, req);
757 esp_input_set_header(skb, seqhi);
759 sg_init_table(sg, nfrags);
760 err = skb_to_sgvec(skb, sg, 0, skb->len);
761 if (unlikely(err < 0)) {
766 skb->ip_summed = CHECKSUM_NONE;
768 if ((x->props.flags & XFRM_STATE_ESN))
769 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
771 aead_request_set_callback(req, 0, esp_input_done, skb);
773 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
774 aead_request_set_ad(req, assoclen);
776 err = crypto_aead_decrypt(req);
777 if (err == -EINPROGRESS)
780 if ((x->props.flags & XFRM_STATE_ESN))
781 esp_input_restore_header(skb);
783 err = esp_input_done2(skb, err);
789 static int esp4_err(struct sk_buff *skb, u32 info)
791 struct net *net = dev_net(skb->dev);
792 const struct iphdr *iph = (const struct iphdr *)skb->data;
793 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
794 struct xfrm_state *x;
796 switch (icmp_hdr(skb)->type) {
797 case ICMP_DEST_UNREACH:
798 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
806 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
807 esph->spi, IPPROTO_ESP, AF_INET);
811 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
812 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
814 ipv4_redirect(skb, net, 0, IPPROTO_ESP);
820 static void esp_destroy(struct xfrm_state *x)
822 struct crypto_aead *aead = x->data;
827 crypto_free_aead(aead);
830 static int esp_init_aead(struct xfrm_state *x)
832 char aead_name[CRYPTO_MAX_ALG_NAME];
833 struct crypto_aead *aead;
837 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
838 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
841 aead = crypto_alloc_aead(aead_name, 0, 0);
848 err = crypto_aead_setkey(aead, x->aead->alg_key,
849 (x->aead->alg_key_len + 7) / 8);
853 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
861 static int esp_init_authenc(struct xfrm_state *x)
863 struct crypto_aead *aead;
864 struct crypto_authenc_key_param *param;
868 char authenc_name[CRYPTO_MAX_ALG_NAME];
878 if ((x->props.flags & XFRM_STATE_ESN)) {
879 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
880 "%s%sauthencesn(%s,%s)%s",
881 x->geniv ?: "", x->geniv ? "(" : "",
882 x->aalg ? x->aalg->alg_name : "digest_null",
884 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
887 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
888 "%s%sauthenc(%s,%s)%s",
889 x->geniv ?: "", x->geniv ? "(" : "",
890 x->aalg ? x->aalg->alg_name : "digest_null",
892 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
896 aead = crypto_alloc_aead(authenc_name, 0, 0);
903 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
904 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
906 key = kmalloc(keylen, GFP_KERNEL);
912 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
913 rta->rta_len = RTA_LENGTH(sizeof(*param));
914 param = RTA_DATA(rta);
915 p += RTA_SPACE(sizeof(*param));
918 struct xfrm_algo_desc *aalg_desc;
920 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
921 p += (x->aalg->alg_key_len + 7) / 8;
923 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
927 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
928 crypto_aead_authsize(aead)) {
929 pr_info("ESP: %s digestsize %u != %hu\n",
931 crypto_aead_authsize(aead),
932 aalg_desc->uinfo.auth.icv_fullbits / 8);
936 err = crypto_aead_setauthsize(
937 aead, x->aalg->alg_trunc_len / 8);
942 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
943 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
945 err = crypto_aead_setkey(aead, key, keylen);
954 static int esp_init_state(struct xfrm_state *x)
956 struct crypto_aead *aead;
963 err = esp_init_aead(x);
965 err = esp_init_authenc(x);
972 x->props.header_len = sizeof(struct ip_esp_hdr) +
973 crypto_aead_ivsize(aead);
974 if (x->props.mode == XFRM_MODE_TUNNEL)
975 x->props.header_len += sizeof(struct iphdr);
976 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
977 x->props.header_len += IPV4_BEET_PHMAXLEN;
979 struct xfrm_encap_tmpl *encap = x->encap;
981 switch (encap->encap_type) {
985 case UDP_ENCAP_ESPINUDP:
986 x->props.header_len += sizeof(struct udphdr);
988 case UDP_ENCAP_ESPINUDP_NON_IKE:
989 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
994 align = ALIGN(crypto_aead_blocksize(aead), 4);
995 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1001 static int esp4_rcv_cb(struct sk_buff *skb, int err)
1006 static const struct xfrm_type esp_type =
1008 .description = "ESP4",
1009 .owner = THIS_MODULE,
1010 .proto = IPPROTO_ESP,
1011 .flags = XFRM_TYPE_REPLAY_PROT,
1012 .init_state = esp_init_state,
1013 .destructor = esp_destroy,
1015 .output = esp_output,
1018 static struct xfrm4_protocol esp4_protocol = {
1019 .handler = xfrm4_rcv,
1020 .input_handler = xfrm_input,
1021 .cb_handler = esp4_rcv_cb,
1022 .err_handler = esp4_err,
1026 static int __init esp4_init(void)
1028 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
1029 pr_info("%s: can't add xfrm type\n", __func__);
1032 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
1033 pr_info("%s: can't add protocol\n", __func__);
1034 xfrm_unregister_type(&esp_type, AF_INET);
1040 static void __exit esp4_fini(void)
1042 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
1043 pr_info("%s: can't remove protocol\n", __func__);
1044 xfrm_unregister_type(&esp_type, AF_INET);
1047 module_init(esp4_init);
1048 module_exit(esp4_fini);
1049 MODULE_LICENSE("GPL");
1050 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);