2019-05-19 20:08:20 +08:00
|
|
|
// SPDX-License-Identifier: GPL-2.0-only
|
2012-03-12 15:03:32 +08:00
|
|
|
#define pr_fmt(fmt) "IPsec: " fmt
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
#include <crypto/aead.h>
|
|
|
|
#include <crypto/authenc.h>
|
2006-07-30 13:41:01 +08:00
|
|
|
#include <linux/err.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/module.h>
|
|
|
|
#include <net/ip.h>
|
|
|
|
#include <net/xfrm.h>
|
|
|
|
#include <net/esp.h>
|
2007-10-27 13:53:58 +08:00
|
|
|
#include <linux/scatterlist.h>
|
2005-10-11 12:11:08 +08:00
|
|
|
#include <linux/kernel.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <linux/pfkeyv2.h>
|
2008-01-29 11:35:05 +08:00
|
|
|
#include <linux/rtnetlink.h>
|
|
|
|
#include <linux/slab.h>
|
2007-10-10 04:33:35 +08:00
|
|
|
#include <linux/spinlock.h>
|
2007-12-11 08:53:05 +08:00
|
|
|
#include <linux/in6.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <net/icmp.h>
|
2005-12-27 12:43:12 +08:00
|
|
|
#include <net/protocol.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
#include <net/udp.h>
|
2019-11-25 21:49:02 +08:00
|
|
|
#include <net/tcp.h>
|
|
|
|
#include <net/espintcp.h>
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
#include <linux/highmem.h>
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
struct esp_skb_cb {
|
|
|
|
struct xfrm_skb_cb xfrm;
|
|
|
|
void *tmp;
|
|
|
|
};
|
|
|
|
|
2016-06-18 13:03:36 +08:00
|
|
|
struct esp_output_extra {
|
|
|
|
__be32 seqhi;
|
|
|
|
u32 esphoff;
|
|
|
|
};
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
#define ESP_SKB_CB(__skb) ((struct esp_skb_cb *)&((__skb)->cb[0]))
|
|
|
|
|
|
|
|
/*
|
|
|
|
* Allocate an AEAD request structure with extra space for SG and IV.
|
|
|
|
*
|
|
|
|
* For alignment considerations the IV is placed at the front, followed
|
|
|
|
* by the request and finally the SG list.
|
|
|
|
*
|
|
|
|
* TODO: Use spare space in skb for this where possible.
|
|
|
|
*/
|
2016-06-18 13:03:36 +08:00
|
|
|
static void *esp_alloc_tmp(struct crypto_aead *aead, int nfrags, int extralen)
|
2008-01-29 11:35:05 +08:00
|
|
|
{
|
|
|
|
unsigned int len;
|
|
|
|
|
2016-06-18 13:03:36 +08:00
|
|
|
len = extralen;
|
2011-03-08 08:07:14 +08:00
|
|
|
|
|
|
|
len += crypto_aead_ivsize(aead);
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
if (len) {
|
|
|
|
len += crypto_aead_alignmask(aead) &
|
|
|
|
~(crypto_tfm_ctx_alignment() - 1);
|
|
|
|
len = ALIGN(len, crypto_tfm_ctx_alignment());
|
|
|
|
}
|
|
|
|
|
2015-05-27 16:03:46 +08:00
|
|
|
len += sizeof(struct aead_request) + crypto_aead_reqsize(aead);
|
2008-01-29 11:35:05 +08:00
|
|
|
len = ALIGN(len, __alignof__(struct scatterlist));
|
|
|
|
|
|
|
|
len += sizeof(struct scatterlist) * nfrags;
|
|
|
|
|
|
|
|
return kmalloc(len, GFP_ATOMIC);
|
|
|
|
}
|
|
|
|
|
2016-06-18 13:03:36 +08:00
|
|
|
static inline void *esp_tmp_extra(void *tmp)
|
2011-03-08 08:07:14 +08:00
|
|
|
{
|
2016-06-18 13:03:36 +08:00
|
|
|
return PTR_ALIGN(tmp, __alignof__(struct esp_output_extra));
|
2011-03-08 08:07:14 +08:00
|
|
|
}
|
2016-06-18 13:03:36 +08:00
|
|
|
|
|
|
|
static inline u8 *esp_tmp_iv(struct crypto_aead *aead, void *tmp, int extralen)
|
2008-01-29 11:35:05 +08:00
|
|
|
{
|
|
|
|
return crypto_aead_ivsize(aead) ?
|
2016-06-18 13:03:36 +08:00
|
|
|
PTR_ALIGN((u8 *)tmp + extralen,
|
|
|
|
crypto_aead_alignmask(aead) + 1) : tmp + extralen;
|
2008-01-29 11:35:05 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct aead_request *esp_tmp_req(struct crypto_aead *aead, u8 *iv)
|
|
|
|
{
|
|
|
|
struct aead_request *req;
|
|
|
|
|
|
|
|
req = (void *)PTR_ALIGN(iv + crypto_aead_ivsize(aead),
|
|
|
|
crypto_tfm_ctx_alignment());
|
|
|
|
aead_request_set_tfm(req, aead);
|
|
|
|
return req;
|
|
|
|
}
|
|
|
|
|
|
|
|
static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
|
|
|
|
struct aead_request *req)
|
|
|
|
{
|
|
|
|
return (void *)ALIGN((unsigned long)(req + 1) +
|
|
|
|
crypto_aead_reqsize(aead),
|
|
|
|
__alignof__(struct scatterlist));
|
|
|
|
}
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
|
|
|
|
{
|
|
|
|
struct crypto_aead *aead = x->data;
|
|
|
|
int extralen = 0;
|
|
|
|
u8 *iv;
|
|
|
|
struct aead_request *req;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
|
|
|
|
if (x->props.flags & XFRM_STATE_ESN)
|
2021-07-17 04:28:46 +08:00
|
|
|
extralen += sizeof(struct esp_output_extra);
|
2017-01-17 17:22:57 +08:00
|
|
|
|
|
|
|
iv = esp_tmp_iv(aead, tmp, extralen);
|
|
|
|
req = esp_tmp_req(aead, iv);
|
|
|
|
|
|
|
|
/* Unref skb_frag_pages in the src scatterlist if necessary.
|
|
|
|
* Skip the first sg which comes from skb->data.
|
|
|
|
*/
|
|
|
|
if (req->src != req->dst)
|
|
|
|
for (sg = sg_next(req->src); sg; sg = sg_next(sg))
|
|
|
|
put_page(sg_page(sg));
|
|
|
|
}
|
|
|
|
|
2019-11-25 21:49:02 +08:00
|
|
|
#ifdef CONFIG_INET_ESPINTCP
|
|
|
|
struct esp_tcp_sk {
|
|
|
|
struct sock *sk;
|
|
|
|
struct rcu_head rcu;
|
|
|
|
};
|
|
|
|
|
|
|
|
static void esp_free_tcp_sk(struct rcu_head *head)
|
|
|
|
{
|
|
|
|
struct esp_tcp_sk *esk = container_of(head, struct esp_tcp_sk, rcu);
|
|
|
|
|
|
|
|
sock_put(esk->sk);
|
|
|
|
kfree(esk);
|
|
|
|
}
|
|
|
|
|
|
|
|
static struct sock *esp_find_tcp_sk(struct xfrm_state *x)
|
|
|
|
{
|
|
|
|
struct xfrm_encap_tmpl *encap = x->encap;
|
2022-09-08 09:10:20 +08:00
|
|
|
struct net *net = xs_net(x);
|
2019-11-25 21:49:02 +08:00
|
|
|
struct esp_tcp_sk *esk;
|
|
|
|
__be16 sport, dport;
|
|
|
|
struct sock *nsk;
|
|
|
|
struct sock *sk;
|
|
|
|
|
|
|
|
sk = rcu_dereference(x->encap_sk);
|
|
|
|
if (sk && sk->sk_state == TCP_ESTABLISHED)
|
|
|
|
return sk;
|
|
|
|
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
sport = encap->encap_sport;
|
|
|
|
dport = encap->encap_dport;
|
|
|
|
nsk = rcu_dereference_protected(x->encap_sk,
|
|
|
|
lockdep_is_held(&x->lock));
|
|
|
|
if (sk && sk == nsk) {
|
|
|
|
esk = kmalloc(sizeof(*esk), GFP_ATOMIC);
|
|
|
|
if (!esk) {
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
}
|
|
|
|
RCU_INIT_POINTER(x->encap_sk, NULL);
|
|
|
|
esk->sk = sk;
|
|
|
|
call_rcu(&esk->rcu, esp_free_tcp_sk);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
|
2022-09-08 09:10:20 +08:00
|
|
|
sk = inet_lookup_established(net, net->ipv4.tcp_death_row.hashinfo, x->id.daddr.a4,
|
2019-11-25 21:49:02 +08:00
|
|
|
dport, x->props.saddr.a4, sport, 0);
|
|
|
|
if (!sk)
|
|
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
|
|
|
|
if (!tcp_is_ulp_esp(sk)) {
|
|
|
|
sock_put(sk);
|
|
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
}
|
|
|
|
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
nsk = rcu_dereference_protected(x->encap_sk,
|
|
|
|
lockdep_is_held(&x->lock));
|
|
|
|
if (encap->encap_sport != sport ||
|
|
|
|
encap->encap_dport != dport) {
|
|
|
|
sock_put(sk);
|
|
|
|
sk = nsk ?: ERR_PTR(-EREMCHG);
|
|
|
|
} else if (sk == nsk) {
|
|
|
|
sock_put(sk);
|
|
|
|
} else {
|
|
|
|
rcu_assign_pointer(x->encap_sk, sk);
|
|
|
|
}
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
|
|
|
|
return sk;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int esp_output_tcp_finish(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct sock *sk;
|
|
|
|
int err;
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
|
|
|
|
sk = esp_find_tcp_sk(x);
|
|
|
|
err = PTR_ERR_OR_ZERO(sk);
|
|
|
|
if (err)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
bh_lock_sock(sk);
|
|
|
|
if (sock_owned_by_user(sk))
|
|
|
|
err = espintcp_queue_out(sk, skb);
|
|
|
|
else
|
|
|
|
err = espintcp_push_skb(sk, skb);
|
|
|
|
bh_unlock_sock(sk);
|
|
|
|
|
|
|
|
out:
|
|
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
|
|
|
static int esp_output_tcp_encap_cb(struct net *net, struct sock *sk,
|
|
|
|
struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct dst_entry *dst = skb_dst(skb);
|
|
|
|
struct xfrm_state *x = dst->xfrm;
|
|
|
|
|
|
|
|
return esp_output_tcp_finish(x, skb);
|
|
|
|
}
|
|
|
|
|
|
|
|
static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int err;
|
|
|
|
|
|
|
|
local_bh_disable();
|
|
|
|
err = xfrm_trans_queue_net(xs_net(x), skb, esp_output_tcp_encap_cb);
|
|
|
|
local_bh_enable();
|
|
|
|
|
|
|
|
/* EINPROGRESS just happens to do the right thing. It
|
|
|
|
* actually means that the skb has been consumed and
|
|
|
|
* isn't coming back.
|
|
|
|
*/
|
|
|
|
return err ?: -EINPROGRESS;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static int esp_output_tail_tcp(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
kfree_skb(skb);
|
|
|
|
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2023-02-06 18:22:38 +08:00
|
|
|
static void esp_output_done(void *data, int err)
|
2008-01-29 11:35:05 +08:00
|
|
|
{
|
2023-02-06 18:22:38 +08:00
|
|
|
struct sk_buff *skb = data;
|
2017-12-20 17:41:36 +08:00
|
|
|
struct xfrm_offload *xo = xfrm_offload(skb);
|
2017-01-17 17:22:57 +08:00
|
|
|
void *tmp;
|
2017-12-20 17:41:36 +08:00
|
|
|
struct xfrm_state *x;
|
|
|
|
|
2018-12-19 00:15:20 +08:00
|
|
|
if (xo && (xo->flags & XFRM_DEV_RESUME)) {
|
|
|
|
struct sec_path *sp = skb_sec_path(skb);
|
|
|
|
|
|
|
|
x = sp->xvec[sp->len - 1];
|
|
|
|
} else {
|
2017-12-20 17:41:36 +08:00
|
|
|
x = skb_dst(skb)->xfrm;
|
2018-12-19 00:15:20 +08:00
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
tmp = ESP_SKB_CB(skb)->tmp;
|
|
|
|
esp_ssg_unref(x, tmp);
|
|
|
|
kfree(tmp);
|
2017-12-20 17:41:36 +08:00
|
|
|
|
|
|
|
if (xo && (xo->flags & XFRM_DEV_RESUME)) {
|
|
|
|
if (err) {
|
|
|
|
XFRM_INC_STATS(xs_net(x), LINUX_MIB_XFRMOUTSTATEPROTOERROR);
|
|
|
|
kfree_skb(skb);
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
|
|
|
skb_push(skb, skb->data - skb_mac_header(skb));
|
|
|
|
secpath_reset(skb);
|
|
|
|
xfrm_dev_resume(skb);
|
|
|
|
} else {
|
2019-11-25 21:49:02 +08:00
|
|
|
if (!err &&
|
|
|
|
x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
|
|
|
|
esp_output_tail_tcp(x, skb);
|
|
|
|
else
|
2021-03-02 03:00:04 +08:00
|
|
|
xfrm_output_resume(skb->sk, skb, err);
|
2017-12-20 17:41:36 +08:00
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
}
|
|
|
|
|
2015-05-27 16:03:46 +08:00
|
|
|
/* Move ESP header back into place. */
|
|
|
|
static void esp_restore_header(struct sk_buff *skb, unsigned int offset)
|
|
|
|
{
|
|
|
|
struct ip_esp_hdr *esph = (void *)(skb->data + offset);
|
|
|
|
void *tmp = ESP_SKB_CB(skb)->tmp;
|
2016-06-18 13:03:36 +08:00
|
|
|
__be32 *seqhi = esp_tmp_extra(tmp);
|
2015-05-27 16:03:46 +08:00
|
|
|
|
|
|
|
esph->seq_no = esph->spi;
|
|
|
|
esph->spi = *seqhi;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void esp_output_restore_header(struct sk_buff *skb)
|
|
|
|
{
|
2016-06-18 13:03:36 +08:00
|
|
|
void *tmp = ESP_SKB_CB(skb)->tmp;
|
|
|
|
struct esp_output_extra *extra = esp_tmp_extra(tmp);
|
|
|
|
|
|
|
|
esp_restore_header(skb, skb_transport_offset(skb) + extra->esphoff -
|
|
|
|
sizeof(__be32));
|
2015-05-27 16:03:46 +08:00
|
|
|
}
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
|
2017-04-14 16:06:33 +08:00
|
|
|
struct xfrm_state *x,
|
2017-01-17 17:22:57 +08:00
|
|
|
struct ip_esp_hdr *esph,
|
|
|
|
struct esp_output_extra *extra)
|
|
|
|
{
|
|
|
|
/* For ESN we move the header forward by 4 bytes to
|
2021-03-25 14:38:25 +08:00
|
|
|
* accommodate the high bits. We will move it back after
|
2017-01-17 17:22:57 +08:00
|
|
|
* encryption.
|
|
|
|
*/
|
|
|
|
if ((x->props.flags & XFRM_STATE_ESN)) {
|
2017-04-14 16:06:50 +08:00
|
|
|
__u32 seqhi;
|
|
|
|
struct xfrm_offload *xo = xfrm_offload(skb);
|
|
|
|
|
|
|
|
if (xo)
|
|
|
|
seqhi = xo->seq.hi;
|
|
|
|
else
|
|
|
|
seqhi = XFRM_SKB_CB(skb)->seq.output.hi;
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
extra->esphoff = (unsigned char *)esph -
|
|
|
|
skb_transport_header(skb);
|
|
|
|
esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
|
|
|
|
extra->seqhi = esph->spi;
|
2017-04-14 16:06:50 +08:00
|
|
|
esph->seq_no = htonl(seqhi);
|
2017-01-17 17:22:57 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
esph->spi = x->id.spi;
|
|
|
|
|
|
|
|
return esph;
|
|
|
|
}
|
|
|
|
|
2023-02-06 18:22:38 +08:00
|
|
|
static void esp_output_done_esn(void *data, int err)
|
2015-05-27 16:03:46 +08:00
|
|
|
{
|
2023-02-06 18:22:38 +08:00
|
|
|
struct sk_buff *skb = data;
|
2015-05-27 16:03:46 +08:00
|
|
|
|
|
|
|
esp_output_restore_header(skb);
|
2023-02-06 18:22:21 +08:00
|
|
|
esp_output_done(data, err);
|
2015-05-27 16:03:46 +08:00
|
|
|
}
|
|
|
|
|
2019-11-25 21:49:01 +08:00
|
|
|
static struct ip_esp_hdr *esp_output_udp_encap(struct sk_buff *skb,
|
|
|
|
int encap_type,
|
|
|
|
struct esp_info *esp,
|
|
|
|
__be16 sport,
|
|
|
|
__be16 dport)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2017-04-14 16:06:33 +08:00
|
|
|
struct udphdr *uh;
|
|
|
|
__be32 *udpdata32;
|
2019-03-25 21:30:00 +08:00
|
|
|
unsigned int len;
|
2017-04-14 16:06:33 +08:00
|
|
|
|
2019-03-25 21:30:00 +08:00
|
|
|
len = skb->len + esp->tailen - skb_transport_offset(skb);
|
2019-11-25 21:49:02 +08:00
|
|
|
if (len + sizeof(struct iphdr) > IP_MAX_MTU)
|
2019-11-25 21:49:01 +08:00
|
|
|
return ERR_PTR(-EMSGSIZE);
|
2019-03-25 21:30:00 +08:00
|
|
|
|
2019-11-25 21:49:01 +08:00
|
|
|
uh = (struct udphdr *)esp->esph;
|
2017-04-14 16:06:33 +08:00
|
|
|
uh->source = sport;
|
|
|
|
uh->dest = dport;
|
2019-03-25 21:30:00 +08:00
|
|
|
uh->len = htons(len);
|
2017-04-14 16:06:33 +08:00
|
|
|
uh->check = 0;
|
|
|
|
|
2019-11-25 21:49:01 +08:00
|
|
|
*skb_mac_header(skb) = IPPROTO_UDP;
|
|
|
|
|
|
|
|
if (encap_type == UDP_ENCAP_ESPINUDP_NON_IKE) {
|
|
|
|
udpdata32 = (__be32 *)(uh + 1);
|
|
|
|
udpdata32[0] = udpdata32[1] = 0;
|
|
|
|
return (struct ip_esp_hdr *)(udpdata32 + 2);
|
|
|
|
}
|
|
|
|
|
|
|
|
return (struct ip_esp_hdr *)(uh + 1);
|
|
|
|
}
|
|
|
|
|
2019-11-25 21:49:02 +08:00
|
|
|
#ifdef CONFIG_INET_ESPINTCP
|
|
|
|
static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
struct esp_info *esp)
|
|
|
|
{
|
|
|
|
__be16 *lenp = (void *)esp->esph;
|
|
|
|
struct ip_esp_hdr *esph;
|
|
|
|
unsigned int len;
|
|
|
|
struct sock *sk;
|
|
|
|
|
|
|
|
len = skb->len + esp->tailen - skb_transport_offset(skb);
|
|
|
|
if (len > IP_MAX_MTU)
|
|
|
|
return ERR_PTR(-EMSGSIZE);
|
|
|
|
|
|
|
|
rcu_read_lock();
|
|
|
|
sk = esp_find_tcp_sk(x);
|
|
|
|
rcu_read_unlock();
|
|
|
|
|
|
|
|
if (IS_ERR(sk))
|
|
|
|
return ERR_CAST(sk);
|
|
|
|
|
|
|
|
*lenp = htons(len);
|
|
|
|
esph = (struct ip_esp_hdr *)(lenp + 1);
|
|
|
|
|
|
|
|
return esph;
|
|
|
|
}
|
|
|
|
#else
|
|
|
|
static struct ip_esp_hdr *esp_output_tcp_encap(struct xfrm_state *x,
|
|
|
|
struct sk_buff *skb,
|
|
|
|
struct esp_info *esp)
|
|
|
|
{
|
|
|
|
return ERR_PTR(-EOPNOTSUPP);
|
|
|
|
}
|
|
|
|
#endif
|
|
|
|
|
2019-11-25 21:49:01 +08:00
|
|
|
static int esp_output_encap(struct xfrm_state *x, struct sk_buff *skb,
|
|
|
|
struct esp_info *esp)
|
|
|
|
{
|
|
|
|
struct xfrm_encap_tmpl *encap = x->encap;
|
|
|
|
struct ip_esp_hdr *esph;
|
|
|
|
__be16 sport, dport;
|
|
|
|
int encap_type;
|
|
|
|
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
sport = encap->encap_sport;
|
|
|
|
dport = encap->encap_dport;
|
|
|
|
encap_type = encap->encap_type;
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
switch (encap_type) {
|
|
|
|
default:
|
|
|
|
case UDP_ENCAP_ESPINUDP:
|
|
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
2019-11-25 21:49:01 +08:00
|
|
|
esph = esp_output_udp_encap(skb, encap_type, esp, sport, dport);
|
2017-04-14 16:06:33 +08:00
|
|
|
break;
|
2019-11-25 21:49:02 +08:00
|
|
|
case TCP_ENCAP_ESPINTCP:
|
|
|
|
esph = esp_output_tcp_encap(x, skb, esp);
|
|
|
|
break;
|
2010-12-08 12:37:50 +08:00
|
|
|
}
|
2011-03-08 08:07:14 +08:00
|
|
|
|
2019-11-25 21:49:01 +08:00
|
|
|
if (IS_ERR(esph))
|
|
|
|
return PTR_ERR(esph);
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
esp->esph = esph;
|
2019-03-25 21:30:00 +08:00
|
|
|
|
|
|
|
return 0;
|
2017-04-14 16:06:33 +08:00
|
|
|
}
|
2011-03-08 08:07:14 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
int esp_output_head(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
|
|
|
|
{
|
|
|
|
u8 *tail;
|
|
|
|
int nfrags;
|
2017-05-03 14:44:27 +08:00
|
|
|
int esph_offset;
|
2017-04-14 16:06:33 +08:00
|
|
|
struct page *page;
|
|
|
|
struct sk_buff *trailer;
|
|
|
|
int tailen = esp->tailen;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2019-11-25 21:49:02 +08:00
|
|
|
/* this is non-NULL only with TCP/UDP Encapsulation */
|
2019-03-25 21:30:00 +08:00
|
|
|
if (x->encap) {
|
2019-11-25 21:49:01 +08:00
|
|
|
int err = esp_output_encap(x, skb, esp);
|
2019-03-25 21:30:00 +08:00
|
|
|
|
|
|
|
if (err < 0)
|
|
|
|
return err;
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2022-04-13 16:10:50 +08:00
|
|
|
if (ALIGN(tailen, L1_CACHE_BYTES) > PAGE_SIZE ||
|
|
|
|
ALIGN(skb->data_len, L1_CACHE_BYTES) > PAGE_SIZE)
|
2022-03-07 20:11:39 +08:00
|
|
|
goto cow;
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
if (!skb_cloned(skb)) {
|
2017-08-25 13:34:35 +08:00
|
|
|
if (tailen <= skb_tailroom(skb)) {
|
2017-01-17 17:22:57 +08:00
|
|
|
nfrags = 1;
|
|
|
|
trailer = skb;
|
|
|
|
tail = skb_tail_pointer(trailer);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
goto skip_cow;
|
|
|
|
} else if ((skb_shinfo(skb)->nr_frags < MAX_SKB_FRAGS)
|
|
|
|
&& !skb_has_frag_list(skb)) {
|
|
|
|
int allocsize;
|
|
|
|
struct sock *sk = skb->sk;
|
|
|
|
struct page_frag *pfrag = &x->xfrag;
|
2015-05-27 16:03:46 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
esp->inplace = false;
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
allocsize = ALIGN(tailen, L1_CACHE_BYTES);
|
|
|
|
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
|
|
|
|
if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
goto cow;
|
|
|
|
}
|
|
|
|
|
|
|
|
page = pfrag->page;
|
|
|
|
get_page(page);
|
|
|
|
|
2021-01-10 06:18:34 +08:00
|
|
|
tail = page_address(page) + pfrag->offset;
|
2017-01-17 17:22:57 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
|
2017-01-17 17:22:57 +08:00
|
|
|
|
|
|
|
nfrags = skb_shinfo(skb)->nr_frags;
|
|
|
|
|
|
|
|
__skb_fill_page_desc(skb, nfrags, page, pfrag->offset,
|
|
|
|
tailen);
|
|
|
|
skb_shinfo(skb)->nr_frags = ++nfrags;
|
|
|
|
|
|
|
|
pfrag->offset = pfrag->offset + allocsize;
|
2017-08-25 13:16:07 +08:00
|
|
|
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
nfrags++;
|
|
|
|
|
2022-06-23 00:09:03 +08:00
|
|
|
skb_len_add(skb, tailen);
|
2019-01-28 16:35:35 +08:00
|
|
|
if (sk && sk_fullsock(sk))
|
2017-06-30 18:08:00 +08:00
|
|
|
refcount_add(tailen, &sk->sk_wmem_alloc);
|
2017-01-17 17:22:57 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
goto out;
|
2017-01-17 17:22:57 +08:00
|
|
|
}
|
2015-05-27 16:03:46 +08:00
|
|
|
}
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
cow:
|
2017-05-03 14:44:27 +08:00
|
|
|
esph_offset = (unsigned char *)esp->esph - skb_transport_header(skb);
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
nfrags = skb_cow_data(skb, tailen, &trailer);
|
|
|
|
if (nfrags < 0)
|
|
|
|
goto out;
|
2017-01-17 17:22:57 +08:00
|
|
|
tail = skb_tail_pointer(trailer);
|
2017-05-03 14:44:27 +08:00
|
|
|
esp->esph = (struct ip_esp_hdr *)(skb_transport_header(skb) + esph_offset);
|
2017-01-17 17:22:57 +08:00
|
|
|
|
|
|
|
skip_cow:
|
2017-04-14 16:06:33 +08:00
|
|
|
esp_output_fill_trailer(tail, esp->tfclen, esp->plen, esp->proto);
|
|
|
|
pskb_put(skb, trailer, tailen);
|
2017-01-17 17:22:57 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
out:
|
|
|
|
return nfrags;
|
|
|
|
}
|
|
|
|
EXPORT_SYMBOL_GPL(esp_output_head);
|
|
|
|
|
|
|
|
int esp_output_tail(struct xfrm_state *x, struct sk_buff *skb, struct esp_info *esp)
|
|
|
|
{
|
|
|
|
u8 *iv;
|
|
|
|
int alen;
|
|
|
|
void *tmp;
|
|
|
|
int ivlen;
|
|
|
|
int assoclen;
|
|
|
|
int extralen;
|
|
|
|
struct page *page;
|
|
|
|
struct ip_esp_hdr *esph;
|
|
|
|
struct crypto_aead *aead;
|
|
|
|
struct aead_request *req;
|
|
|
|
struct scatterlist *sg, *dsg;
|
|
|
|
struct esp_output_extra *extra;
|
|
|
|
int err = -ENOMEM;
|
|
|
|
|
|
|
|
assoclen = sizeof(struct ip_esp_hdr);
|
|
|
|
extralen = 0;
|
|
|
|
|
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
|
|
extralen += sizeof(*extra);
|
|
|
|
assoclen += sizeof(__be32);
|
|
|
|
}
|
2015-05-27 16:03:46 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
aead = x->data;
|
|
|
|
alen = crypto_aead_authsize(aead);
|
|
|
|
ivlen = crypto_aead_ivsize(aead);
|
|
|
|
|
|
|
|
tmp = esp_alloc_tmp(aead, esp->nfrags + 2, extralen);
|
2017-04-24 13:33:56 +08:00
|
|
|
if (!tmp)
|
2017-01-17 17:22:57 +08:00
|
|
|
goto error;
|
|
|
|
|
|
|
|
extra = esp_tmp_extra(tmp);
|
|
|
|
iv = esp_tmp_iv(aead, tmp, extralen);
|
|
|
|
req = esp_tmp_req(aead, iv);
|
|
|
|
sg = esp_req_sg(aead, req);
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
if (esp->inplace)
|
|
|
|
dsg = sg;
|
|
|
|
else
|
|
|
|
dsg = &sg[esp->nfrags];
|
2017-01-17 17:22:57 +08:00
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
esph = esp_output_set_extra(skb, x, esp->esph, extra);
|
|
|
|
esp->esph = esph;
|
|
|
|
|
|
|
|
sg_init_table(sg, esp->nfrags);
|
2017-06-04 10:16:23 +08:00
|
|
|
err = skb_to_sgvec(skb, sg,
|
|
|
|
(unsigned char *)esph - skb->data,
|
|
|
|
assoclen + ivlen + esp->clen + alen);
|
|
|
|
if (unlikely(err < 0))
|
2017-07-13 15:13:30 +08:00
|
|
|
goto error_free;
|
2017-04-14 16:06:33 +08:00
|
|
|
|
|
|
|
if (!esp->inplace) {
|
|
|
|
int allocsize;
|
|
|
|
struct page_frag *pfrag = &x->xfrag;
|
|
|
|
|
|
|
|
allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
|
|
|
|
|
|
|
|
spin_lock_bh(&x->lock);
|
|
|
|
if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
|
|
|
|
spin_unlock_bh(&x->lock);
|
2017-07-13 15:13:30 +08:00
|
|
|
goto error_free;
|
2017-04-14 16:06:33 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
skb_shinfo(skb)->nr_frags = 1;
|
|
|
|
|
|
|
|
page = pfrag->page;
|
|
|
|
get_page(page);
|
|
|
|
/* replace page frags in skb with new page */
|
|
|
|
__skb_fill_page_desc(skb, 0, page, pfrag->offset, skb->data_len);
|
|
|
|
pfrag->offset = pfrag->offset + allocsize;
|
|
|
|
spin_unlock_bh(&x->lock);
|
|
|
|
|
|
|
|
sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
|
2017-06-04 10:16:23 +08:00
|
|
|
err = skb_to_sgvec(skb, dsg,
|
|
|
|
(unsigned char *)esph - skb->data,
|
|
|
|
assoclen + ivlen + esp->clen + alen);
|
|
|
|
if (unlikely(err < 0))
|
2017-07-13 15:13:30 +08:00
|
|
|
goto error_free;
|
2017-04-14 16:06:33 +08:00
|
|
|
}
|
2011-03-08 08:07:14 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
if ((x->props.flags & XFRM_STATE_ESN))
|
|
|
|
aead_request_set_callback(req, 0, esp_output_done_esn, skb);
|
|
|
|
else
|
|
|
|
aead_request_set_callback(req, 0, esp_output_done, skb);
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
aead_request_set_crypt(req, sg, dsg, ivlen + esp->clen, iv);
|
2015-05-27 16:03:46 +08:00
|
|
|
aead_request_set_ad(req, assoclen);
|
|
|
|
|
|
|
|
memset(iv, 0, ivlen);
|
2017-04-14 16:06:33 +08:00
|
|
|
memcpy(iv + ivlen - min(ivlen, 8), (u8 *)&esp->seqno + 8 - min(ivlen, 8),
|
2015-05-27 16:03:46 +08:00
|
|
|
min(ivlen, 8));
|
2008-01-29 11:35:05 +08:00
|
|
|
|
|
|
|
ESP_SKB_CB(skb)->tmp = tmp;
|
2015-05-27 16:03:46 +08:00
|
|
|
err = crypto_aead_encrypt(req);
|
|
|
|
|
|
|
|
switch (err) {
|
|
|
|
case -EINPROGRESS:
|
2008-01-29 11:35:05 +08:00
|
|
|
goto error;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-10-18 15:00:35 +08:00
|
|
|
case -ENOSPC:
|
2008-01-29 11:35:05 +08:00
|
|
|
err = NET_XMIT_DROP;
|
2015-05-27 16:03:46 +08:00
|
|
|
break;
|
|
|
|
|
|
|
|
case 0:
|
|
|
|
if ((x->props.flags & XFRM_STATE_ESN))
|
|
|
|
esp_output_restore_header(skb);
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
if (sg != dsg)
|
|
|
|
esp_ssg_unref(x, tmp);
|
2007-10-10 04:33:35 +08:00
|
|
|
|
2019-11-25 21:49:02 +08:00
|
|
|
if (!err && x->encap && x->encap->encap_type == TCP_ENCAP_ESPINTCP)
|
|
|
|
err = esp_output_tail_tcp(x, skb);
|
|
|
|
|
2017-07-13 15:13:30 +08:00
|
|
|
error_free:
|
|
|
|
kfree(tmp);
|
2005-04-17 06:20:36 +08:00
|
|
|
error:
|
|
|
|
return err;
|
|
|
|
}
|
2017-04-14 16:06:33 +08:00
|
|
|
EXPORT_SYMBOL_GPL(esp_output_tail);
|
|
|
|
|
|
|
|
static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
int alen;
|
|
|
|
int blksize;
|
|
|
|
struct ip_esp_hdr *esph;
|
|
|
|
struct crypto_aead *aead;
|
|
|
|
struct esp_info esp;
|
|
|
|
|
|
|
|
esp.inplace = true;
|
|
|
|
|
|
|
|
esp.proto = *skb_mac_header(skb);
|
|
|
|
*skb_mac_header(skb) = IPPROTO_ESP;
|
|
|
|
|
|
|
|
/* skb is pure payload to encrypt */
|
|
|
|
|
|
|
|
aead = x->data;
|
|
|
|
alen = crypto_aead_authsize(aead);
|
|
|
|
|
|
|
|
esp.tfclen = 0;
|
|
|
|
if (x->tfcpad) {
|
|
|
|
struct xfrm_dst *dst = (struct xfrm_dst *)skb_dst(skb);
|
|
|
|
u32 padto;
|
|
|
|
|
2022-01-26 23:00:18 +08:00
|
|
|
padto = min(x->tfcpad, xfrm_state_mtu(x, dst->child_mtu_cached));
|
2017-04-14 16:06:33 +08:00
|
|
|
if (skb->len < padto)
|
|
|
|
esp.tfclen = padto - skb->len;
|
|
|
|
}
|
|
|
|
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
|
|
|
|
esp.clen = ALIGN(skb->len + 2 + esp.tfclen, blksize);
|
|
|
|
esp.plen = esp.clen - skb->len - esp.tfclen;
|
|
|
|
esp.tailen = esp.tfclen + esp.plen + alen;
|
|
|
|
|
|
|
|
esp.esph = ip_esp_hdr(skb);
|
|
|
|
|
|
|
|
esp.nfrags = esp_output_head(x, skb, &esp);
|
|
|
|
if (esp.nfrags < 0)
|
|
|
|
return esp.nfrags;
|
|
|
|
|
|
|
|
esph = esp.esph;
|
|
|
|
esph->spi = x->id.spi;
|
|
|
|
|
|
|
|
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
|
|
|
|
esp.seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
|
|
|
|
((u64)XFRM_SKB_CB(skb)->seq.output.hi << 32));
|
|
|
|
|
|
|
|
skb_push(skb, -skb_network_offset(skb));
|
|
|
|
|
|
|
|
return esp_output_tail(x, skb, &esp);
|
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-08-30 16:30:39 +08:00
|
|
|
static inline int esp_remove_trailer(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
struct xfrm_state *x = xfrm_input_state(skb);
|
|
|
|
struct crypto_aead *aead = x->data;
|
|
|
|
int alen, hlen, elen;
|
|
|
|
int padlen, trimlen;
|
|
|
|
__wsum csumdiff;
|
|
|
|
u8 nexthdr[2];
|
|
|
|
int ret;
|
|
|
|
|
|
|
|
alen = crypto_aead_authsize(aead);
|
|
|
|
hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
|
|
|
|
elen = skb->len - hlen;
|
|
|
|
|
|
|
|
if (skb_copy_bits(skb, skb->len - alen - 2, nexthdr, 2))
|
|
|
|
BUG();
|
|
|
|
|
|
|
|
ret = -EINVAL;
|
|
|
|
padlen = nexthdr[0];
|
|
|
|
if (padlen + 2 + alen >= elen) {
|
|
|
|
net_dbg_ratelimited("ipsec esp packet is garbage padlen=%d, elen=%d\n",
|
|
|
|
padlen + 2, elen - alen);
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
|
|
|
|
trimlen = alen + padlen + 2;
|
|
|
|
if (skb->ip_summed == CHECKSUM_COMPLETE) {
|
|
|
|
csumdiff = skb_checksum(skb, skb->len - trimlen, trimlen, 0);
|
|
|
|
skb->csum = csum_block_sub(skb->csum, csumdiff,
|
|
|
|
skb->len - trimlen);
|
|
|
|
}
|
|
|
|
pskb_trim(skb, skb->len - trimlen);
|
|
|
|
|
|
|
|
ret = nexthdr[1];
|
|
|
|
|
|
|
|
out:
|
|
|
|
return ret;
|
|
|
|
}
|
|
|
|
|
2017-04-14 16:06:33 +08:00
|
|
|
int esp_input_done2(struct sk_buff *skb, int err)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2011-04-22 12:53:02 +08:00
|
|
|
const struct iphdr *iph;
|
2008-01-29 11:35:05 +08:00
|
|
|
struct xfrm_state *x = xfrm_input_state(skb);
|
2017-04-14 16:06:10 +08:00
|
|
|
struct xfrm_offload *xo = xfrm_offload(skb);
|
2013-10-18 18:09:05 +08:00
|
|
|
struct crypto_aead *aead = x->data;
|
2008-01-29 11:35:05 +08:00
|
|
|
int hlen = sizeof(struct ip_esp_hdr) + crypto_aead_ivsize(aead);
|
2006-05-28 14:06:13 +08:00
|
|
|
int ihl;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2021-03-01 18:46:02 +08:00
|
|
|
if (!xo || !(xo->flags & CRYPTO_DONE))
|
2017-04-14 16:06:10 +08:00
|
|
|
kfree(ESP_SKB_CB(skb)->tmp);
|
2007-11-14 13:45:58 +08:00
|
|
|
|
2006-07-30 13:41:01 +08:00
|
|
|
if (unlikely(err))
|
2007-12-17 07:55:02 +08:00
|
|
|
goto out;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2017-08-30 16:30:39 +08:00
|
|
|
err = esp_remove_trailer(skb);
|
|
|
|
if (unlikely(err < 0))
|
2006-02-28 05:00:01 +08:00
|
|
|
goto out;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2007-04-21 13:47:35 +08:00
|
|
|
iph = ip_hdr(skb);
|
2006-05-28 14:06:13 +08:00
|
|
|
ihl = iph->ihl * 4;
|
|
|
|
|
2006-02-28 05:00:40 +08:00
|
|
|
if (x->encap) {
|
|
|
|
struct xfrm_encap_tmpl *encap = x->encap;
|
2019-11-25 21:49:02 +08:00
|
|
|
struct tcphdr *th = (void *)(skb_network_header(skb) + ihl);
|
2007-04-11 11:50:43 +08:00
|
|
|
struct udphdr *uh = (void *)(skb_network_header(skb) + ihl);
|
2019-11-25 21:49:00 +08:00
|
|
|
__be16 source;
|
|
|
|
|
|
|
|
switch (x->encap->encap_type) {
|
2019-11-25 21:49:02 +08:00
|
|
|
case TCP_ENCAP_ESPINTCP:
|
|
|
|
source = th->source;
|
|
|
|
break;
|
2019-11-25 21:49:00 +08:00
|
|
|
case UDP_ENCAP_ESPINUDP:
|
|
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
|
|
source = uh->source;
|
|
|
|
break;
|
|
|
|
default:
|
|
|
|
WARN_ON_ONCE(1);
|
|
|
|
err = -EINVAL;
|
|
|
|
goto out;
|
|
|
|
}
|
2006-02-28 05:00:40 +08:00
|
|
|
|
|
|
|
/*
|
|
|
|
* 1) if the NAT-T peer's IP or port changed then
|
|
|
|
* advertize the change to the keying daemon.
|
|
|
|
* This is an inbound SA, so just compare
|
|
|
|
* SRC ports.
|
|
|
|
*/
|
|
|
|
if (iph->saddr != x->props.saddr.a4 ||
|
2019-11-25 21:49:00 +08:00
|
|
|
source != encap->encap_sport) {
|
2006-02-28 05:00:40 +08:00
|
|
|
xfrm_address_t ipaddr;
|
|
|
|
|
|
|
|
ipaddr.a4 = iph->saddr;
|
2019-11-25 21:49:00 +08:00
|
|
|
km_new_mapping(x, &ipaddr, source);
|
2007-02-09 22:24:47 +08:00
|
|
|
|
2006-02-28 05:00:40 +08:00
|
|
|
/* XXX: perhaps add an extra
|
|
|
|
* policy check here, to see
|
|
|
|
* if we should allow or
|
|
|
|
* reject a packet from a
|
|
|
|
* different source
|
|
|
|
* address/port.
|
|
|
|
*/
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-02-09 22:24:47 +08:00
|
|
|
|
2006-02-28 05:00:40 +08:00
|
|
|
/*
|
|
|
|
* 2) ignore UDP/TCP checksums in case
|
|
|
|
* of NAT-T in Transport Mode, or
|
|
|
|
* perform other post-processing fixes
|
|
|
|
* as per draft-ietf-ipsec-udp-encaps-06,
|
|
|
|
* section 3.1.2
|
|
|
|
*/
|
2007-10-11 06:41:41 +08:00
|
|
|
if (x->props.mode == XFRM_MODE_TRANSPORT)
|
2006-02-28 05:00:40 +08:00
|
|
|
skb->ip_summed = CHECKSUM_UNNECESSARY;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2017-08-01 17:49:04 +08:00
|
|
|
skb_pull_rcsum(skb, hlen);
|
2012-12-28 16:07:16 +08:00
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
|
|
|
skb_reset_transport_header(skb);
|
|
|
|
else
|
|
|
|
skb_set_transport_header(skb, -ihl);
|
2006-02-28 05:00:01 +08:00
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
/* RFC4303: Drop dummy packets without any error */
|
|
|
|
if (err == IPPROTO_NONE)
|
|
|
|
err = -EINVAL;
|
|
|
|
|
|
|
|
out:
|
|
|
|
return err;
|
|
|
|
}
|
2017-04-14 16:06:33 +08:00
|
|
|
EXPORT_SYMBOL_GPL(esp_input_done2);
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2023-02-06 18:22:38 +08:00
|
|
|
static void esp_input_done(void *data, int err)
|
2008-01-29 11:35:05 +08:00
|
|
|
{
|
2023-02-06 18:22:38 +08:00
|
|
|
struct sk_buff *skb = data;
|
2008-01-29 11:35:05 +08:00
|
|
|
|
|
|
|
xfrm_input_resume(skb, esp_input_done2(skb, err));
|
|
|
|
}
|
|
|
|
|
2015-05-27 16:03:46 +08:00
|
|
|
static void esp_input_restore_header(struct sk_buff *skb)
|
|
|
|
{
|
|
|
|
esp_restore_header(skb, 0);
|
|
|
|
__skb_pull(skb, 4);
|
|
|
|
}
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
|
|
|
|
{
|
|
|
|
struct xfrm_state *x = xfrm_input_state(skb);
|
2018-01-30 22:53:48 +08:00
|
|
|
struct ip_esp_hdr *esph;
|
2017-01-17 17:22:57 +08:00
|
|
|
|
|
|
|
/* For ESN we move the header forward by 4 bytes to
|
2021-03-25 14:38:25 +08:00
|
|
|
* accommodate the high bits. We will move it back after
|
2017-01-17 17:22:57 +08:00
|
|
|
* decryption.
|
|
|
|
*/
|
|
|
|
if ((x->props.flags & XFRM_STATE_ESN)) {
|
networking: make skb_push & __skb_push return void pointers
It seems like a historic accident that these return unsigned char *,
and in many places that means casts are required, more often than not.
Make these functions return void * and remove all the casts across
the tree, adding a (u8 *) cast only where the unsigned char pointer
was used directly, all done with the following spatch:
@@
expression SKB, LEN;
typedef u8;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- *(fn(SKB, LEN))
+ *(u8 *)fn(SKB, LEN)
@@
expression E, SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
type T;
@@
- E = ((T *)(fn(SKB, LEN)))
+ E = fn(SKB, LEN)
@@
expression SKB, LEN;
identifier fn = { skb_push, __skb_push, skb_push_rcsum };
@@
- fn(SKB, LEN)[0]
+ *(u8 *)fn(SKB, LEN)
Note that the last part there converts from push(...)[0] to the
more idiomatic *(u8 *)push(...).
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2017-06-16 20:29:23 +08:00
|
|
|
esph = skb_push(skb, 4);
|
2017-01-17 17:22:57 +08:00
|
|
|
*seqhi = esph->spi;
|
|
|
|
esph->spi = esph->seq_no;
|
|
|
|
esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2023-02-06 18:22:38 +08:00
|
|
|
static void esp_input_done_esn(void *data, int err)
|
2015-05-27 16:03:46 +08:00
|
|
|
{
|
2023-02-06 18:22:38 +08:00
|
|
|
struct sk_buff *skb = data;
|
2015-05-27 16:03:46 +08:00
|
|
|
|
|
|
|
esp_input_restore_header(skb);
|
2023-02-06 18:22:21 +08:00
|
|
|
esp_input_done(data, err);
|
2015-05-27 16:03:46 +08:00
|
|
|
}
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
/*
|
|
|
|
* Note: detecting truncated vs. non-truncated authentication data is very
|
|
|
|
* expensive, so we only support truncated data, which is the recommended
|
|
|
|
* and common case.
|
|
|
|
*/
|
|
|
|
static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
|
|
|
|
{
|
2013-10-18 18:09:05 +08:00
|
|
|
struct crypto_aead *aead = x->data;
|
2008-01-29 11:35:05 +08:00
|
|
|
struct aead_request *req;
|
|
|
|
struct sk_buff *trailer;
|
2015-05-27 16:03:46 +08:00
|
|
|
int ivlen = crypto_aead_ivsize(aead);
|
2018-08-17 15:51:00 +08:00
|
|
|
int elen = skb->len - sizeof(struct ip_esp_hdr) - ivlen;
|
2008-01-29 11:35:05 +08:00
|
|
|
int nfrags;
|
2011-03-08 08:07:14 +08:00
|
|
|
int assoclen;
|
|
|
|
int seqhilen;
|
|
|
|
__be32 *seqhi;
|
2008-01-29 11:35:05 +08:00
|
|
|
void *tmp;
|
|
|
|
u8 *iv;
|
|
|
|
struct scatterlist *sg;
|
|
|
|
int err = -EINVAL;
|
|
|
|
|
2018-08-17 15:51:00 +08:00
|
|
|
if (!pskb_may_pull(skb, sizeof(struct ip_esp_hdr) + ivlen))
|
2008-01-29 11:35:05 +08:00
|
|
|
goto out;
|
|
|
|
|
|
|
|
if (elen <= 0)
|
|
|
|
goto out;
|
|
|
|
|
2018-08-17 15:51:00 +08:00
|
|
|
assoclen = sizeof(struct ip_esp_hdr);
|
2011-03-08 08:07:14 +08:00
|
|
|
seqhilen = 0;
|
|
|
|
|
|
|
|
if (x->props.flags & XFRM_STATE_ESN) {
|
|
|
|
seqhilen += sizeof(__be32);
|
|
|
|
assoclen += seqhilen;
|
|
|
|
}
|
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
if (!skb_cloned(skb)) {
|
|
|
|
if (!skb_is_nonlinear(skb)) {
|
|
|
|
nfrags = 1;
|
|
|
|
|
|
|
|
goto skip_cow;
|
|
|
|
} else if (!skb_has_frag_list(skb)) {
|
|
|
|
nfrags = skb_shinfo(skb)->nr_frags;
|
|
|
|
nfrags++;
|
|
|
|
|
|
|
|
goto skip_cow;
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
|
|
|
err = skb_cow_data(skb, 0, &trailer);
|
|
|
|
if (err < 0)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
nfrags = err;
|
|
|
|
|
|
|
|
skip_cow:
|
2008-01-29 11:35:05 +08:00
|
|
|
err = -ENOMEM;
|
2015-05-27 16:03:46 +08:00
|
|
|
tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
|
2008-01-29 11:35:05 +08:00
|
|
|
if (!tmp)
|
|
|
|
goto out;
|
|
|
|
|
|
|
|
ESP_SKB_CB(skb)->tmp = tmp;
|
2016-06-18 13:03:36 +08:00
|
|
|
seqhi = esp_tmp_extra(tmp);
|
2011-03-08 08:07:14 +08:00
|
|
|
iv = esp_tmp_iv(aead, tmp, seqhilen);
|
2008-01-29 11:35:05 +08:00
|
|
|
req = esp_tmp_req(aead, iv);
|
2015-05-27 16:03:46 +08:00
|
|
|
sg = esp_req_sg(aead, req);
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
esp_input_set_header(skb, seqhi);
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
sg_init_table(sg, nfrags);
|
2017-06-04 10:16:23 +08:00
|
|
|
err = skb_to_sgvec(skb, sg, 0, skb->len);
|
2017-07-13 15:13:30 +08:00
|
|
|
if (unlikely(err < 0)) {
|
|
|
|
kfree(tmp);
|
2017-06-04 10:16:23 +08:00
|
|
|
goto out;
|
2017-07-13 15:13:30 +08:00
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
skb->ip_summed = CHECKSUM_NONE;
|
2011-03-08 08:07:14 +08:00
|
|
|
|
2017-01-17 17:22:57 +08:00
|
|
|
if ((x->props.flags & XFRM_STATE_ESN))
|
2015-05-27 16:03:46 +08:00
|
|
|
aead_request_set_callback(req, 0, esp_input_done_esn, skb);
|
2017-01-17 17:22:57 +08:00
|
|
|
else
|
|
|
|
aead_request_set_callback(req, 0, esp_input_done, skb);
|
2015-05-27 16:03:46 +08:00
|
|
|
|
|
|
|
aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
|
|
|
|
aead_request_set_ad(req, assoclen);
|
2008-01-29 11:35:05 +08:00
|
|
|
|
|
|
|
err = crypto_aead_decrypt(req);
|
|
|
|
if (err == -EINPROGRESS)
|
|
|
|
goto out;
|
|
|
|
|
2015-05-27 16:03:46 +08:00
|
|
|
if ((x->props.flags & XFRM_STATE_ESN))
|
|
|
|
esp_input_restore_header(skb);
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
err = esp_input_done2(skb, err);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
out:
|
2007-12-17 07:55:02 +08:00
|
|
|
return err;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2014-02-21 15:41:08 +08:00
|
|
|
static int esp4_err(struct sk_buff *skb, u32 info)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2008-11-26 09:59:27 +08:00
|
|
|
struct net *net = dev_net(skb->dev);
|
2011-04-22 12:53:02 +08:00
|
|
|
const struct iphdr *iph = (const struct iphdr *)skb->data;
|
2008-11-03 16:23:42 +08:00
|
|
|
struct ip_esp_hdr *esph = (struct ip_esp_hdr *)(skb->data+(iph->ihl<<2));
|
2005-04-17 06:20:36 +08:00
|
|
|
struct xfrm_state *x;
|
|
|
|
|
2012-07-12 12:27:49 +08:00
|
|
|
switch (icmp_hdr(skb)->type) {
|
|
|
|
case ICMP_DEST_UNREACH:
|
|
|
|
if (icmp_hdr(skb)->code != ICMP_FRAG_NEEDED)
|
2014-02-21 15:41:08 +08:00
|
|
|
return 0;
|
2020-11-21 02:25:57 +08:00
|
|
|
break;
|
2012-07-12 12:27:49 +08:00
|
|
|
case ICMP_REDIRECT:
|
|
|
|
break;
|
|
|
|
default:
|
2014-02-21 15:41:08 +08:00
|
|
|
return 0;
|
2012-07-12 12:27:49 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2011-04-22 12:53:02 +08:00
|
|
|
x = xfrm_state_lookup(net, skb->mark, (const xfrm_address_t *)&iph->daddr,
|
|
|
|
esph->spi, IPPROTO_ESP, AF_INET);
|
2005-04-17 06:20:36 +08:00
|
|
|
if (!x)
|
2014-02-21 15:41:08 +08:00
|
|
|
return 0;
|
2012-07-12 12:27:49 +08:00
|
|
|
|
2013-05-28 04:46:31 +08:00
|
|
|
if (icmp_hdr(skb)->type == ICMP_DEST_UNREACH)
|
2018-09-26 11:56:26 +08:00
|
|
|
ipv4_update_pmtu(skb, net, info, 0, IPPROTO_ESP);
|
2013-05-28 04:46:31 +08:00
|
|
|
else
|
2018-09-26 11:56:27 +08:00
|
|
|
ipv4_redirect(skb, net, 0, IPPROTO_ESP);
|
2005-04-17 06:20:36 +08:00
|
|
|
xfrm_state_put(x);
|
2014-02-21 15:41:08 +08:00
|
|
|
|
|
|
|
return 0;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
static void esp_destroy(struct xfrm_state *x)
|
|
|
|
{
|
2013-10-18 18:09:05 +08:00
|
|
|
struct crypto_aead *aead = x->data;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
if (!aead)
|
2005-04-17 06:20:36 +08:00
|
|
|
return;
|
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
crypto_free_aead(aead);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2022-09-27 23:45:31 +08:00
|
|
|
static int esp_init_aead(struct xfrm_state *x, struct netlink_ext_ack *extack)
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
2015-05-27 16:03:46 +08:00
|
|
|
char aead_name[CRYPTO_MAX_ALG_NAME];
|
2008-01-29 11:37:29 +08:00
|
|
|
struct crypto_aead *aead;
|
|
|
|
int err;
|
|
|
|
|
2015-05-27 16:03:46 +08:00
|
|
|
if (snprintf(aead_name, CRYPTO_MAX_ALG_NAME, "%s(%s)",
|
2022-09-27 23:45:31 +08:00
|
|
|
x->geniv, x->aead->alg_name) >= CRYPTO_MAX_ALG_NAME) {
|
|
|
|
NL_SET_ERR_MSG(extack, "Algorithm name is too long");
|
|
|
|
return -ENAMETOOLONG;
|
|
|
|
}
|
2015-05-27 16:03:46 +08:00
|
|
|
|
2017-12-20 17:41:53 +08:00
|
|
|
aead = crypto_alloc_aead(aead_name, 0, 0);
|
2008-01-29 11:37:29 +08:00
|
|
|
err = PTR_ERR(aead);
|
|
|
|
if (IS_ERR(aead))
|
|
|
|
goto error;
|
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
x->data = aead;
|
2008-01-29 11:37:29 +08:00
|
|
|
|
|
|
|
err = crypto_aead_setkey(aead, x->aead->alg_key,
|
|
|
|
(x->aead->alg_key_len + 7) / 8);
|
|
|
|
if (err)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
err = crypto_aead_setauthsize(aead, x->aead->alg_icv_len / 8);
|
|
|
|
if (err)
|
|
|
|
goto error;
|
|
|
|
|
2022-09-27 23:45:31 +08:00
|
|
|
return 0;
|
|
|
|
|
2008-01-29 11:37:29 +08:00
|
|
|
error:
|
2022-09-27 23:45:31 +08:00
|
|
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
2008-01-29 11:37:29 +08:00
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2022-09-27 23:45:31 +08:00
|
|
|
static int esp_init_authenc(struct xfrm_state *x,
|
|
|
|
struct netlink_ext_ack *extack)
|
2008-01-29 11:37:29 +08:00
|
|
|
{
|
2008-01-29 11:35:05 +08:00
|
|
|
struct crypto_aead *aead;
|
|
|
|
struct crypto_authenc_key_param *param;
|
|
|
|
struct rtattr *rta;
|
|
|
|
char *key;
|
|
|
|
char *p;
|
|
|
|
char authenc_name[CRYPTO_MAX_ALG_NAME];
|
|
|
|
unsigned int keylen;
|
|
|
|
int err;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
2008-01-29 11:37:29 +08:00
|
|
|
err = -ENAMETOOLONG;
|
2011-03-08 08:07:14 +08:00
|
|
|
|
|
|
|
if ((x->props.flags & XFRM_STATE_ESN)) {
|
|
|
|
if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
|
2015-05-27 16:03:46 +08:00
|
|
|
"%s%sauthencesn(%s,%s)%s",
|
|
|
|
x->geniv ?: "", x->geniv ? "(" : "",
|
2011-03-08 08:07:14 +08:00
|
|
|
x->aalg ? x->aalg->alg_name : "digest_null",
|
2015-05-27 16:03:46 +08:00
|
|
|
x->ealg->alg_name,
|
2022-09-27 23:45:31 +08:00
|
|
|
x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) {
|
|
|
|
NL_SET_ERR_MSG(extack, "Algorithm name is too long");
|
2011-03-08 08:07:14 +08:00
|
|
|
goto error;
|
2022-09-27 23:45:31 +08:00
|
|
|
}
|
2011-03-08 08:07:14 +08:00
|
|
|
} else {
|
|
|
|
if (snprintf(authenc_name, CRYPTO_MAX_ALG_NAME,
|
2015-05-27 16:03:46 +08:00
|
|
|
"%s%sauthenc(%s,%s)%s",
|
|
|
|
x->geniv ?: "", x->geniv ? "(" : "",
|
2011-03-08 08:07:14 +08:00
|
|
|
x->aalg ? x->aalg->alg_name : "digest_null",
|
2015-05-27 16:03:46 +08:00
|
|
|
x->ealg->alg_name,
|
2022-09-27 23:45:31 +08:00
|
|
|
x->geniv ? ")" : "") >= CRYPTO_MAX_ALG_NAME) {
|
|
|
|
NL_SET_ERR_MSG(extack, "Algorithm name is too long");
|
2011-03-08 08:07:14 +08:00
|
|
|
goto error;
|
2022-09-27 23:45:31 +08:00
|
|
|
}
|
2011-03-08 08:07:14 +08:00
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2017-12-20 17:41:53 +08:00
|
|
|
aead = crypto_alloc_aead(authenc_name, 0, 0);
|
2008-01-29 11:35:05 +08:00
|
|
|
err = PTR_ERR(aead);
|
2022-09-27 23:45:31 +08:00
|
|
|
if (IS_ERR(aead)) {
|
|
|
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
2008-01-29 11:35:05 +08:00
|
|
|
goto error;
|
2022-09-27 23:45:31 +08:00
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
x->data = aead;
|
2008-01-29 11:35:05 +08:00
|
|
|
|
|
|
|
keylen = (x->aalg ? (x->aalg->alg_key_len + 7) / 8 : 0) +
|
|
|
|
(x->ealg->alg_key_len + 7) / 8 + RTA_SPACE(sizeof(*param));
|
|
|
|
err = -ENOMEM;
|
|
|
|
key = kmalloc(keylen, GFP_KERNEL);
|
|
|
|
if (!key)
|
|
|
|
goto error;
|
|
|
|
|
|
|
|
p = key;
|
|
|
|
rta = (void *)p;
|
|
|
|
rta->rta_type = CRYPTO_AUTHENC_KEYA_PARAM;
|
|
|
|
rta->rta_len = RTA_LENGTH(sizeof(*param));
|
|
|
|
param = RTA_DATA(rta);
|
|
|
|
p += RTA_SPACE(sizeof(*param));
|
|
|
|
|
2005-04-17 06:20:36 +08:00
|
|
|
if (x->aalg) {
|
|
|
|
struct xfrm_algo_desc *aalg_desc;
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
memcpy(p, x->aalg->alg_key, (x->aalg->alg_key_len + 7) / 8);
|
|
|
|
p += (x->aalg->alg_key_len + 7) / 8;
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
|
|
|
|
BUG_ON(!aalg_desc);
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
err = -EINVAL;
|
2014-11-06 07:36:08 +08:00
|
|
|
if (aalg_desc->uinfo.auth.icv_fullbits / 8 !=
|
2008-01-29 11:35:05 +08:00
|
|
|
crypto_aead_authsize(aead)) {
|
2022-09-27 23:45:31 +08:00
|
|
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
2008-01-29 11:35:05 +08:00
|
|
|
goto free_key;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
err = crypto_aead_setauthsize(
|
2009-11-25 08:29:53 +08:00
|
|
|
aead, x->aalg->alg_trunc_len / 8);
|
2022-09-27 23:45:31 +08:00
|
|
|
if (err) {
|
|
|
|
NL_SET_ERR_MSG(extack, "Kernel was unable to initialize cryptographic operations");
|
2008-01-29 11:35:05 +08:00
|
|
|
goto free_key;
|
2022-09-27 23:45:31 +08:00
|
|
|
}
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
2007-10-09 08:13:44 +08:00
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
param->enckeylen = cpu_to_be32((x->ealg->alg_key_len + 7) / 8);
|
|
|
|
memcpy(p, x->ealg->alg_key, (x->ealg->alg_key_len + 7) / 8);
|
|
|
|
|
|
|
|
err = crypto_aead_setkey(aead, key, keylen);
|
|
|
|
|
|
|
|
free_key:
|
|
|
|
kfree(key);
|
|
|
|
|
2008-01-29 11:37:29 +08:00
|
|
|
error:
|
|
|
|
return err;
|
|
|
|
}
|
|
|
|
|
2022-09-27 23:45:29 +08:00
|
|
|
static int esp_init_state(struct xfrm_state *x, struct netlink_ext_ack *extack)
|
2008-01-29 11:37:29 +08:00
|
|
|
{
|
|
|
|
struct crypto_aead *aead;
|
|
|
|
u32 align;
|
|
|
|
int err;
|
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
x->data = NULL;
|
2008-01-29 11:37:29 +08:00
|
|
|
|
2022-09-27 23:45:31 +08:00
|
|
|
if (x->aead) {
|
|
|
|
err = esp_init_aead(x, extack);
|
|
|
|
} else if (x->ealg) {
|
|
|
|
err = esp_init_authenc(x, extack);
|
|
|
|
} else {
|
|
|
|
NL_SET_ERR_MSG(extack, "ESP: AEAD or CRYPT must be provided");
|
|
|
|
err = -EINVAL;
|
|
|
|
}
|
2008-01-29 11:37:29 +08:00
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
if (err)
|
2005-04-17 06:20:36 +08:00
|
|
|
goto error;
|
2008-01-29 11:35:05 +08:00
|
|
|
|
2013-10-18 18:09:05 +08:00
|
|
|
aead = x->data;
|
2008-01-29 11:37:29 +08:00
|
|
|
|
2008-01-29 11:35:05 +08:00
|
|
|
x->props.header_len = sizeof(struct ip_esp_hdr) +
|
|
|
|
crypto_aead_ivsize(aead);
|
2006-09-23 06:05:15 +08:00
|
|
|
if (x->props.mode == XFRM_MODE_TUNNEL)
|
2005-04-17 06:20:36 +08:00
|
|
|
x->props.header_len += sizeof(struct iphdr);
|
2008-08-06 17:39:30 +08:00
|
|
|
else if (x->props.mode == XFRM_MODE_BEET && x->sel.family != AF_INET6)
|
2007-04-10 02:47:58 +08:00
|
|
|
x->props.header_len += IPV4_BEET_PHMAXLEN;
|
2005-04-17 06:20:36 +08:00
|
|
|
if (x->encap) {
|
|
|
|
struct xfrm_encap_tmpl *encap = x->encap;
|
|
|
|
|
|
|
|
switch (encap->encap_type) {
|
|
|
|
default:
|
2022-09-27 23:45:31 +08:00
|
|
|
NL_SET_ERR_MSG(extack, "Unsupported encapsulation type for ESP");
|
2018-01-05 19:12:32 +08:00
|
|
|
err = -EINVAL;
|
2005-04-17 06:20:36 +08:00
|
|
|
goto error;
|
|
|
|
case UDP_ENCAP_ESPINUDP:
|
|
|
|
x->props.header_len += sizeof(struct udphdr);
|
|
|
|
break;
|
|
|
|
case UDP_ENCAP_ESPINUDP_NON_IKE:
|
|
|
|
x->props.header_len += sizeof(struct udphdr) + 2 * sizeof(u32);
|
|
|
|
break;
|
2019-11-25 21:49:02 +08:00
|
|
|
#ifdef CONFIG_INET_ESPINTCP
|
|
|
|
case TCP_ENCAP_ESPINTCP:
|
|
|
|
/* only the length field, TCP encap is done by
|
|
|
|
* the socket
|
|
|
|
*/
|
|
|
|
x->props.header_len += 2;
|
|
|
|
break;
|
|
|
|
#endif
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
}
|
2008-01-29 11:35:05 +08:00
|
|
|
|
|
|
|
align = ALIGN(crypto_aead_blocksize(aead), 4);
|
2013-10-18 18:09:05 +08:00
|
|
|
x->props.trailer_len = align + 1 + crypto_aead_authsize(aead);
|
2005-04-17 06:20:36 +08:00
|
|
|
|
|
|
|
error:
|
2008-01-29 11:35:05 +08:00
|
|
|
return err;
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
2014-02-21 15:41:08 +08:00
|
|
|
static int esp4_rcv_cb(struct sk_buff *skb, int err)
|
|
|
|
{
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
2008-01-31 11:11:50 +08:00
|
|
|
static const struct xfrm_type esp_type =
|
2005-04-17 06:20:36 +08:00
|
|
|
{
|
|
|
|
.owner = THIS_MODULE,
|
|
|
|
.proto = IPPROTO_ESP,
|
2007-10-09 08:25:53 +08:00
|
|
|
.flags = XFRM_TYPE_REPLAY_PROT,
|
2005-04-17 06:20:36 +08:00
|
|
|
.init_state = esp_init_state,
|
|
|
|
.destructor = esp_destroy,
|
|
|
|
.input = esp_input,
|
2017-04-14 16:06:33 +08:00
|
|
|
.output = esp_output,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
2014-02-21 15:41:08 +08:00
|
|
|
static struct xfrm4_protocol esp4_protocol = {
|
2005-04-17 06:20:36 +08:00
|
|
|
.handler = xfrm4_rcv,
|
2014-02-21 15:41:08 +08:00
|
|
|
.input_handler = xfrm_input,
|
|
|
|
.cb_handler = esp4_rcv_cb,
|
2005-04-17 06:20:36 +08:00
|
|
|
.err_handler = esp4_err,
|
2014-02-21 15:41:08 +08:00
|
|
|
.priority = 0,
|
2005-04-17 06:20:36 +08:00
|
|
|
};
|
|
|
|
|
|
|
|
static int __init esp4_init(void)
|
|
|
|
{
|
|
|
|
if (xfrm_register_type(&esp_type, AF_INET) < 0) {
|
2012-03-12 02:36:11 +08:00
|
|
|
pr_info("%s: can't add xfrm type\n", __func__);
|
2005-04-17 06:20:36 +08:00
|
|
|
return -EAGAIN;
|
|
|
|
}
|
2014-02-21 15:41:08 +08:00
|
|
|
if (xfrm4_protocol_register(&esp4_protocol, IPPROTO_ESP) < 0) {
|
2012-03-12 02:36:11 +08:00
|
|
|
pr_info("%s: can't add protocol\n", __func__);
|
2005-04-17 06:20:36 +08:00
|
|
|
xfrm_unregister_type(&esp_type, AF_INET);
|
|
|
|
return -EAGAIN;
|
|
|
|
}
|
|
|
|
return 0;
|
|
|
|
}
|
|
|
|
|
|
|
|
static void __exit esp4_fini(void)
|
|
|
|
{
|
2014-02-21 15:41:08 +08:00
|
|
|
if (xfrm4_protocol_deregister(&esp4_protocol, IPPROTO_ESP) < 0)
|
2012-03-12 02:36:11 +08:00
|
|
|
pr_info("%s: can't remove protocol\n", __func__);
|
2019-05-03 23:46:19 +08:00
|
|
|
xfrm_unregister_type(&esp_type, AF_INET);
|
2005-04-17 06:20:36 +08:00
|
|
|
}
|
|
|
|
|
|
|
|
module_init(esp4_init);
|
|
|
|
module_exit(esp4_fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
2007-06-27 14:57:49 +08:00
|
|
|
MODULE_ALIAS_XFRM_TYPE(AF_INET, XFRM_PROTO_ESP);
|