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 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 #ifdef CONFIG_INET_ESPINTCP
128 static void esp_free_tcp_sk(struct rcu_head *head)
130 struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu);
136 static struct sock *esp_find_tcp_sk(struct xfrm_state *x)
138 struct xfrm_encap_tmpl *encap = x->encap;
139 struct esp_tcp_sk *esk;
144 sk = rcu_dereference(x->encap_sk);
145 if (sk && sk->sk_state == TCP_ESTABLISHED)
148 spin_lock_bh(&x->lock);
149 sport = encap->encap_sport;
150 dport = encap->encap_dport;
151 nsk = rcu_dereference_protected(x->encap_sk,
152 lockdep_is_held(&x->lock));
153 if (sk && sk == nsk) {
154 esk = kmalloc(sizeof(*esk), GFP_ATOMIC);
156 spin_unlock_bh(&x->lock);
157 return ERR_PTR(-ENOMEM);
159 RCU_INIT_POINTER(x->encap_sk, NULL);
161 call_rcu(&esk->rcu, esp_free_tcp_sk);
163 spin_unlock_bh(&x->lock);
165 sk = inet_lookup_established(xs_net(x), &tcp_hashinfo, x->id.daddr.a4,
166 dport, x->props.saddr.a4, sport, 0);
168 return ERR_PTR(-ENOENT);
170 if (!tcp_is_ulp_esp(sk)) {
172 return ERR_PTR(-EINVAL);
175 spin_lock_bh(&x->lock);
176 nsk = rcu_dereference_protected(x->encap_sk,
177 lockdep_is_held(&x->lock));
178 if (encap->encap_sport != sport ||
179 encap->encap_dport != dport) {
181 sk = nsk ?: ERR_PTR(-EREMCHG);
182 } else if (sk == nsk) {
185 rcu_assign_pointer(x->encap_sk, sk);
187 spin_unlock_bh(&x->lock);
192 static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb)
199 sk = esp_find_tcp_sk(x);
200 err = PTR_ERR_OR_ZERO(sk);
205 if (sock_owned_by_user(sk))
206 err = espintcp_queue_out(sk, skb);
208 err = espintcp_push_skb(sk, skb);
216 static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk,
219 struct dst_entry *dst = skb_dst(skb);
220 struct xfrm_state *x = dst->xfrm;
222 return esp_output_tcp_finish(x, skb);
225 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
230 err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb);
233 /* EINPROGRESS just happens to do the right thing. It
234 * actually means that the skb has been consumed and
237 return err ?: -EINPROGRESS;
240 static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
248 static void esp_output_done(struct crypto_async_request *base, int err)
250 struct sk_buff *skb = base->data;
251 struct xfrm_offload *xo = xfrm_offload(skb);
253 struct xfrm_state *x;
255 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
256 struct sec_path *sp = skb_sec_path(skb);
258 x = sp->xvec[sp->len - 1];
260 x = skb_dst(skb)->xfrm;
263 tmp = ESP_SKB_CB(skb)->tmp;
264 esp_ssg_unref(x, tmp);
267 if (xo && (xo->flags & XFRM_DEV_RESUME)) {
269 XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
274 skb_push(skb, skb->data - skb_mac_header(skb));
276 xfrm_dev_resume(skb);
279 x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
280 esp_output_tail_tcp(x, skb);
282 xfrm_output_resume(skb, err);
286 /* Move ESP header back into place. */
287 static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
289 struct ip_esp_hdr *esph = (void *)(skb->data + offset);
290 void *tmp = ESP_SKB_CB(skb)->tmp;
291 __be32 *seqhi = esp_tmp_extra(tmp);
293 esph->seq_no = esph->spi;
297 static void esp_output_restore_header(struct sk_buff *skb)
299 void *tmp = ESP_SKB_CB(skb)->tmp;
300 struct esp_output_extra *extra = esp_tmp_extra(tmp);
302 esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
306 static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
307 struct xfrm_state *x,
308 struct ip_esp_hdr *esph,
309 struct esp_output_extra *extra)
311 /* For ESN we move the header forward by 4 bytes to
312 * accomodate the high bits. We will move it back after
315 if ((x->props.flags & XFRM_STATE_ESN)) {
317 struct xfrm_offload *xo = xfrm_offload(skb);
322 seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
324 extra->esphoff = (unsigned char *)esph -
325 skb_transport_header(skb);
326 esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
327 extra->seqhi = esph->spi;
328 esph->seq_no = htonl(seqhi);
331 esph->spi = x->id.spi;
336 static void esp_output_done_esn(struct crypto_async_request *base, int err)
338 struct sk_buff *skb = base->data;
340 esp_output_restore_header(skb);
341 esp_output_done(base, err);
344 static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
346 /* Fill padding... */
348 memset(tail, 0, tfclen);
353 for (i = 0; i < plen - 2; i++)
356 tail[plen - 2] = plen - 2;
357 tail[plen - 1] = proto;
360 static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
362 struct esp_info *esp,
370 len = skb->len + esp->tailen - skb_transport_offset(skb);
371 if (len + sizeof(struct iphdr) > IP_MAX_MTU)
372 return ERR_PTR(-EMSGSIZE);
374 uh = (struct udphdr *)esp->esph;
377 uh->len = htons(len);
380 *skb_mac_header(skb) = IPPROTO_UDP;
382 if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
383 udpdata32 = (__be32 *)(uh + 1);
384 udpdata32[0] = udpdata32[1] = 0;
385 return (struct ip_esp_hdr *)(udpdata32 + 2);
388 return (struct ip_esp_hdr *)(uh + 1);
391 #ifdef CONFIG_INET_ESPINTCP
392 static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
394 struct esp_info *esp)
396 __be16 *lenp = (void *)esp->esph;
397 struct ip_esp_hdr *esph;
401 len = skb->len + esp->tailen - skb_transport_offset(skb);
402 if (len > IP_MAX_MTU)
403 return ERR_PTR(-EMSGSIZE);
406 sk = esp_find_tcp_sk(x);
413 esph = (struct ip_esp_hdr *)(lenp + 1);
418 static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
420 struct esp_info *esp)
422 return ERR_PTR(-EOPNOTSUPP);
426 static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
427 struct esp_info *esp)
429 struct xfrm_encap_tmpl *encap = x->encap;
430 struct ip_esp_hdr *esph;
434 spin_lock_bh(&x->lock);
435 sport = encap->encap_sport;
436 dport = encap->encap_dport;
437 encap_type = encap->encap_type;
438 spin_unlock_bh(&x->lock);
440 switch (encap_type) {
442 case UDP_ENCAP_ESPINUDP:
443 case UDP_ENCAP_ESPINUDP_NON_IKE:
444 esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
446 case TCP_ENCAP_ESPINTCP:
447 esph = esp_output_tcp_encap(x, skb, esp);
452 return PTR_ERR(esph);
459 int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
466 struct sk_buff *trailer;
467 int tailen = esp->tailen;
469 /* this is non-NULL only with TCP/UDP Encapsulation */
471 int err = esp_output_encap(x, skb, esp);
477 if (!skb_cloned(skb)) {
478 if (tailen <= skb_tailroom(skb)) {
481 tail = skb_tail_pointer(trailer);
484 } else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
485 && !skb_has_frag_list(skb)) {
487 struct sock *sk = skb->sk;
488 struct page_frag *pfrag = &x->xfrag;
490 esp->inplace = false;
492 allocsize = ALIGN(tailen, L1_CACHE_BYTES);
494 spin_lock_bh(&x->lock);
496 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
497 spin_unlock_bh(&x->lock);
504 vaddr = kmap_atomic(page);
506 tail = vaddr + pfrag->offset;
508 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
510 kunmap_atomic(vaddr);
512 nfrags = skb_shinfo(skb)->nr_frags;
514 __skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
516 skb_shinfo(skb)->nr_frags = ++nfrags;
518 pfrag->offset = pfrag->offset + allocsize;
520 spin_unlock_bh(&x->lock);
525 skb->data_len += tailen;
526 skb->truesize += tailen;
527 if (sk && sk_fullsock(sk))
528 refcount_add(tailen, &sk->sk_wmem_alloc);
535 esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
537 nfrags = skb_cow_data(skb, tailen, &trailer);
540 tail = skb_tail_pointer(trailer);
541 esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
544 esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
545 pskb_put(skb, trailer, tailen);
550 EXPORT_SYMBOL_GPL(esp_output_head);
552 int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
561 struct ip_esp_hdr *esph;
562 struct crypto_aead *aead;
563 struct aead_request *req;
564 struct scatterlist *sg, *dsg;
565 struct esp_output_extra *extra;
568 assoclen = sizeof(struct ip_esp_hdr);
571 if (x->props.flags & XFRM_STATE_ESN) {
572 extralen += sizeof(*extra);
573 assoclen += sizeof(__be32);
577 alen = crypto_aead_authsize(aead);
578 ivlen = crypto_aead_ivsize(aead);
580 tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
584 extra = esp_tmp_extra(tmp);
585 iv = esp_tmp_iv(aead, tmp, extralen);
586 req = esp_tmp_req(aead, iv);
587 sg = esp_req_sg(aead, req);
592 dsg = &sg[esp->nfrags];
594 esph = esp_output_set_extra(skb, x, esp->esph, extra);
597 sg_init_table(sg, esp->nfrags);
598 err = skb_to_sgvec(skb, sg,
599 (unsigned char *)esph - skb->data,
600 assoclen + ivlen + esp->clen + alen);
601 if (unlikely(err < 0))
606 struct page_frag *pfrag = &x->xfrag;
608 allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
610 spin_lock_bh(&x->lock);
611 if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
612 spin_unlock_bh(&x->lock);
616 skb_shinfo(skb)->nr_frags = 1;
620 /* replace page frags in skb with new page */
621 __skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
622 pfrag->offset = pfrag->offset + allocsize;
623 spin_unlock_bh(&x->lock);
625 sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
626 err = skb_to_sgvec(skb, dsg,
627 (unsigned char *)esph - skb->data,
628 assoclen + ivlen + esp->clen + alen);
629 if (unlikely(err < 0))
633 if ((x->props.flags & XFRM_STATE_ESN))
634 aead_request_set_callback(req, 0, esp_output_done_esn, skb);
636 aead_request_set_callback(req, 0, esp_output_done, skb);
638 aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
639 aead_request_set_ad(req, assoclen);
641 memset(iv, 0, ivlen);
642 memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
645 ESP_SKB_CB(skb)->tmp = tmp;
646 err = crypto_aead_encrypt(req);
657 if ((x->props.flags & XFRM_STATE_ESN))
658 esp_output_restore_header(skb);
662 esp_ssg_unref(x, tmp);
664 if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
665 err = esp_output_tail_tcp(x, skb);
672 EXPORT_SYMBOL_GPL(esp_output_tail);
674 static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
678 struct ip_esp_hdr *esph;
679 struct crypto_aead *aead;
684 esp.proto = *skb_mac_header(skb);
685 *skb_mac_header(skb) = IPPROTO_ESP;
687 /* skb is pure payload to encrypt */
690 alen = crypto_aead_authsize(aead);
694 struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
697 padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
698 if (skb->len < padto)
699 esp.tfclen = padto - skb->len;
701 blksize = ALIGN(crypto_aead_blocksize(aead), 4);
702 esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
703 esp.plen = esp.clen - skb->len - esp.tfclen;
704 esp.tailen = esp.tfclen + esp.plen + alen;
706 esp.esph = ip_esp_hdr(skb);
708 esp.nfrags = esp_output_head(x, skb, &esp);
713 esph->spi = x->id.spi;
715 esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
716 esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
717 ((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
719 skb_push(skb, -skb_network_offset(skb));
721 return esp_output_tail(x, skb, &esp);
724 static inline int esp_remove_trailer(struct sk_buff *skb)
726 struct xfrm_state *x = xfrm_input_state(skb);
727 struct xfrm_offload *xo = xfrm_offload(skb);
728 struct crypto_aead *aead = x->data;
729 int alen, hlen, elen;
735 alen = crypto_aead_authsize(aead);
736 hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
737 elen = skb->len - hlen;
739 if (xo && (xo->flags & XFRM_ESP_NO_TRAILER)) {
744 if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
749 if (padlen + 2 + alen >= elen) {
750 net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
751 padlen + 2, elen - alen);
755 trimlen = alen + padlen + 2;
756 if (skb->ip_summed == CHECKSUM_COMPLETE) {
757 csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
758 skb->csum = csum_block_sub(skb->csum, csumdiff,
761 pskb_trim(skb, skb->len - trimlen);
769 int esp_input_done2(struct sk_buff *skb, int err)
771 const struct iphdr *iph;
772 struct xfrm_state *x = xfrm_input_state(skb);
773 struct xfrm_offload *xo = xfrm_offload(skb);
774 struct crypto_aead *aead = x->data;
775 int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
778 if (!xo || (xo && !(xo->flags & CRYPTO_DONE)))
779 kfree(ESP_SKB_CB(skb)->tmp);
784 err = esp_remove_trailer(skb);
785 if (unlikely(err < 0))
792 struct xfrm_encap_tmpl *encap = x->encap;
793 struct tcphdr *th = (void *)(skb_network_header(skb) + ihl);
794 struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
797 switch (x->encap->encap_type) {
798 case TCP_ENCAP_ESPINTCP:
801 case UDP_ENCAP_ESPINUDP:
802 case UDP_ENCAP_ESPINUDP_NON_IKE:
812 * 1) if the NAT-T peer's IP or port changed then
813 * advertize the change to the keying daemon.
814 * This is an inbound SA, so just compare
817 if (iph->saddr != x->props.saddr.a4 ||
818 source != encap->encap_sport) {
819 xfrm_address_t ipaddr;
821 ipaddr.a4 = iph->saddr;
822 km_new_mapping(x, &ipaddr, source);
824 /* XXX: perhaps add an extra
825 * policy check here, to see
826 * if we should allow or
827 * reject a packet from a
834 * 2) ignore UDP/TCP checksums in case
835 * of NAT-T in Transport Mode, or
836 * perform other post-processing fixes
837 * as per draft-ietf-ipsec-udp-encaps-06,
840 if (x->props.mode == XFRM_MODE_TRANSPORT)
841 skb->ip_summed = CHECKSUM_UNNECESSARY;
844 skb_pull_rcsum(skb, hlen);
845 if (x->props.mode == XFRM_MODE_TUNNEL)
846 skb_reset_transport_header(skb);
848 skb_set_transport_header(skb, -ihl);
850 /* RFC4303: Drop dummy packets without any error */
851 if (err == IPPROTO_NONE)
857 EXPORT_SYMBOL_GPL(esp_input_done2);
859 static void esp_input_done(struct crypto_async_request *base, int err)
861 struct sk_buff *skb = base->data;
863 xfrm_input_resume(skb, esp_input_done2(skb, err));
866 static void esp_input_restore_header(struct sk_buff *skb)
868 esp_restore_header(skb, 0);
872 static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
874 struct xfrm_state *x = xfrm_input_state(skb);
875 struct ip_esp_hdr *esph;
877 /* For ESN we move the header forward by 4 bytes to
878 * accomodate the high bits. We will move it back after
881 if ((x->props.flags & XFRM_STATE_ESN)) {
882 esph = skb_push(skb, 4);
884 esph->spi = esph->seq_no;
885 esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
889 static void esp_input_done_esn(struct crypto_async_request *base, int err)
891 struct sk_buff *skb = base->data;
893 esp_input_restore_header(skb);
894 esp_input_done(base, err);
898 * Note: detecting truncated vs. non-truncated authentication data is very
899 * expensive, so we only support truncated data, which is the recommended
902 static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
904 struct crypto_aead *aead = x->data;
905 struct aead_request *req;
906 struct sk_buff *trailer;
907 int ivlen = crypto_aead_ivsize(aead);
908 int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
915 struct scatterlist *sg;
918 if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
924 assoclen = sizeof(struct ip_esp_hdr);
927 if (x->props.flags & XFRM_STATE_ESN) {
928 seqhilen += sizeof(__be32);
929 assoclen += seqhilen;
932 if (!skb_cloned(skb)) {
933 if (!skb_is_nonlinear(skb)) {
937 } else if (!skb_has_frag_list(skb)) {
938 nfrags = skb_shinfo(skb)->nr_frags;
945 err = skb_cow_data(skb, 0, &trailer);
953 tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
957 ESP_SKB_CB(skb)->tmp = tmp;
958 seqhi = esp_tmp_extra(tmp);
959 iv = esp_tmp_iv(aead, tmp, seqhilen);
960 req = esp_tmp_req(aead, iv);
961 sg = esp_req_sg(aead, req);
963 esp_input_set_header(skb, seqhi);
965 sg_init_table(sg, nfrags);
966 err = skb_to_sgvec(skb, sg, 0, skb->len);
967 if (unlikely(err < 0)) {
972 skb->ip_summed = CHECKSUM_NONE;
974 if ((x->props.flags & XFRM_STATE_ESN))
975 aead_request_set_callback(req, 0, esp_input_done_esn, skb);
977 aead_request_set_callback(req, 0, esp_input_done, skb);
979 aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
980 aead_request_set_ad(req, assoclen);
982 err = crypto_aead_decrypt(req);
983 if (err == -EINPROGRESS)
986 if ((x->props.flags & XFRM_STATE_ESN))
987 esp_input_restore_header(skb);
989 err = esp_input_done2(skb, err);
995 static int esp4_err(struct sk_buff *skb, u32 info)
997 struct net *net = dev_net(skb->dev);
998 const struct iphdr *iph = (const struct iphdr *)skb->data;
999 struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
1000 struct xfrm_state *x;
1002 switch (icmp_hdr(skb)->type) {
1003 case ICMP_DEST_UNREACH:
1004 if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
1012 x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
1013 esph->spi, IPPROTO_ESP, AF_INET);
1017 if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
1018 ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
1020 ipv4_redirect(skb, net, 0, IPPROTO_ESP);
1026 static void esp_destroy(struct xfrm_state *x)
1028 struct crypto_aead *aead = x->data;
1033 crypto_free_aead(aead);
1036 static int esp_init_aead(struct xfrm_state *x)
1038 char aead_name[CRYPTO_MAX_ALG_NAME];
1039 struct crypto_aead *aead;
1042 err = -ENAMETOOLONG;
1043 if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
1044 x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME)
1047 aead = crypto_alloc_aead(aead_name, 0, 0);
1048 err = PTR_ERR(aead);
1054 err = crypto_aead_setkey(aead, x->aead->alg_key,
1055 (x->aead->alg_key_len + 7) / 8);
1059 err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
1067 static int esp_init_authenc(struct xfrm_state *x)
1069 struct crypto_aead *aead;
1070 struct crypto_authenc_key_param *param;
1074 char authenc_name[CRYPTO_MAX_ALG_NAME];
1075 unsigned int keylen;
1082 err = -ENAMETOOLONG;
1084 if ((x->props.flags & XFRM_STATE_ESN)) {
1085 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
1086 "%s%sauthencesn(%s,%s)%s",
1087 x->geniv ?: "", x->geniv ? "(" : "",
1088 x->aalg ? x->aalg->alg_name : "digest_null",
1090 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
1093 if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
1094 "%s%sauthenc(%s,%s)%s",
1095 x->geniv ?: "", x->geniv ? "(" : "",
1096 x->aalg ? x->aalg->alg_name : "digest_null",
1098 x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME)
1102 aead = crypto_alloc_aead(authenc_name, 0, 0);
1103 err = PTR_ERR(aead);
1109 keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
1110 (x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
1112 key = kmalloc(keylen, GFP_KERNEL);
1118 rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
1119 rta->rta_len = RTA_LENGTH(sizeof(*param));
1120 param = RTA_DATA(rta);
1121 p += RTA_SPACE(sizeof(*param));
1124 struct xfrm_algo_desc *aalg_desc;
1126 memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
1127 p += (x->aalg->alg_key_len + 7) / 8;
1129 aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
1133 if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
1134 crypto_aead_authsize(aead)) {
1135 pr_info("ESP: %s digestsize %u != %hu\n",
1137 crypto_aead_authsize(aead),
1138 aalg_desc->uinfo.auth.icv_fullbits / 8);
1142 err = crypto_aead_setauthsize(
1143 aead, x->aalg->alg_trunc_len / 8);
1148 param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
1149 memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
1151 err = crypto_aead_setkey(aead, key, keylen);
1160 static int esp_init_state(struct xfrm_state *x)
1162 struct crypto_aead *aead;
1169 err = esp_init_aead(x);
1171 err = esp_init_authenc(x);
1178 x->props.header_len = sizeof(struct ip_esp_hdr) +
1179 crypto_aead_ivsize(aead);
1180 if (x->props.mode == XFRM_MODE_TUNNEL)
1181 x->props.header_len += sizeof(struct iphdr);
1182 else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
1183 x->props.header_len += IPV4_BEET_PHMAXLEN;
1185 struct xfrm_encap_tmpl *encap = x->encap;
1187 switch (encap->encap_type) {
1191 case UDP_ENCAP_ESPINUDP:
1192 x->props.header_len += sizeof(struct udphdr);
1194 case UDP_ENCAP_ESPINUDP_NON_IKE:
1195 x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
1197 #ifdef CONFIG_INET_ESPINTCP
1198 case TCP_ENCAP_ESPINTCP:
1199 /* only the length field, TCP encap is done by
1202 x->props.header_len += 2;
1208 align = ALIGN(crypto_aead_blocksize(aead), 4);
1209 x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
1215 static int esp4_rcv_cb(struct sk_buff *skb, int err)
1220 static const struct xfrm_type esp_type =
1222 .description = "ESP4",
1223 .owner = THIS_MODULE,
1224 .proto = IPPROTO_ESP,
1225 .flags = XFRM_TYPE_REPLAY_PROT,
1226 .init_state = esp_init_state,
1227 .destructor = esp_destroy,
1229 .output = esp_output,
1232 static struct xfrm4_protocol esp4_protocol = {
1233 .handler = xfrm4_rcv,
1234 .input_handler = xfrm_input,
1235 .cb_handler = esp4_rcv_cb,
1236 .err_handler = esp4_err,
1240 static int __init esp4_init(void)
1242 if (xfrm_register_type(&esp_type, AF_INET) < 0) {
1243 pr_info("%s: can't add xfrm type\n", __func__);
1246 if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
1247 pr_info("%s: can't add protocol\n", __func__);
1248 xfrm_unregister_type(&esp_type, AF_INET);
1254 static void __exit esp4_fini(void)
1256 if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
1257 pr_info("%s: can't remove protocol\n", __func__);
1258 xfrm_unregister_type(&esp_type, AF_INET);
1261 module_init(esp4_init);
1262 module_exit(esp4_fini);
1263 MODULE_LICENSE("GPL");
1264 MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);