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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/klassert/ipsec-next

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Steffen Klassert says:

====================
pull request (net-next): ipsec-next 2017-02-01

1) Some typo fixes, from Alexander Alemayhu.

2) Don't acquire state lock in get_mtu functions.
   The only rece against a dead state does not matter.
   From Florian Westphal.

3) Remove xfrm4_state_fini, it is unused for more than
   10 years. From Florian Westphal.

4) Various rcu usage improvements. From Florian Westphal.

5) Properly handle crypto arrors in ah4/ah6.
   From Gilad Ben-Yossef.

6) Try to avoid skb linearization in esp4 and esp6.

7) The esp trailer is now set up in different places,
   add a helper for this.

8) With the upcomming usage of gro_cells in IPsec,
   a gro merged skb can have a secpath. Drop it
   before freeing or reusing the skb.

9) Add a xfrm dummy network device for napi. With
   this we can use gro_cells from within xfrm,
   it allows IPsec GRO without impact on the generic
   networking code.

Please pull or let me know if there are problems.
====================

Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller 2017-02-01 11:22:38 -05:00
commit 04cdf13e34
11 changed files with 580 additions and 202 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
include/net/xfrm.h
View File

@ -213,6 +213,8 @@ struct xfrm_state {
/* Last used time */
unsigned long lastused;
struct page_frag xfrag;
/* Reference to data common to all the instances of this
* transformer. */
const struct xfrm_type *type;
@ -343,7 +345,7 @@ struct xfrm_state_afinfo {
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo);
int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo);
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family);
void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo);
struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family);
struct xfrm_input_afinfo {
unsigned int family;

2
net/core/dev.c
View File

@ -4593,6 +4593,7 @@ static gro_result_t napi_skb_finish(gro_result_t ret, struct sk_buff *skb)
case GRO_MERGED_FREE:
if (NAPI_GRO_CB(skb)->free == NAPI_GRO_FREE_STOLEN_HEAD) {
skb_dst_drop(skb);
secpath_reset(skb);
kmem_cache_free(skbuff_head_cache, skb);
} else {
__kfree_skb(skb);
@ -4633,6 +4634,7 @@ static void napi_reuse_skb(struct napi_struct *napi, struct sk_buff *skb)
skb->encapsulation = 0;
skb_shinfo(skb)->gso_type = 0;
skb->truesize = SKB_TRUESIZE(skb_end_offset(skb));
secpath_reset(skb);
napi->skb = skb;
}

3
net/ipv4/ah4.c
View File

@ -270,6 +270,9 @@ static void ah_input_done(struct crypto_async_request *base, int err)
int ihl = ip_hdrlen(skb);
int ah_hlen = (ah->hdrlen + 2) << 2;
if (err)
goto out;
work_iph = AH_SKB_CB(skb)->tmp;
auth_data = ah_tmp_auth(work_iph, ihl);
icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);

334
net/ipv4/esp4.c
View File

@ -18,6 +18,8 @@
#include <net/protocol.h>
#include <net/udp.h>
#include <linux/highmem.h>
struct esp_skb_cb {
struct xfrm_skb_cb xfrm;
void *tmp;
@ -92,11 +94,40 @@ static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
__alignof__(struct scatterlist));
}
static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
{
struct esp_output_extra *extra = esp_tmp_extra(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)
extralen += sizeof(*extra);
extra = esp_tmp_extra(tmp);
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));
}
static void esp_output_done(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
void *tmp;
struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
kfree(ESP_SKB_CB(skb)->tmp);
tmp = ESP_SKB_CB(skb)->tmp;
esp_ssg_unref(x, tmp);
kfree(tmp);
xfrm_output_resume(skb, err);
}
@ -120,6 +151,29 @@ static void esp_output_restore_header(struct sk_buff *skb)
sizeof(__be32));
}
static struct ip_esp_hdr *esp_output_set_extra(struct sk_buff *skb,
struct ip_esp_hdr *esph,
struct esp_output_extra *extra)
{
struct xfrm_state *x = skb_dst(skb)->xfrm;
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
extra->esphoff = (unsigned char *)esph -
skb_transport_header(skb);
esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
extra->seqhi = esph->spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
}
esph->spi = x->id.spi;
return esph;
}
static void esp_output_done_esn(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
@ -128,18 +182,36 @@ static void esp_output_done_esn(struct crypto_async_request *base, int err)
esp_output_done(base, err);
}
static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
{
/* Fill padding... */
if (tfclen) {
memset(tail, 0, tfclen);
tail += tfclen;
}
do {
int i;
for (i = 0; i < plen - 2; i++)
tail[i] = i + 1;
} while (0);
tail[plen - 2] = plen - 2;
tail[plen - 1] = proto;
}
static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
{
int err;
struct esp_output_extra *extra;
int err = -ENOMEM;
struct ip_esp_hdr *esph;
struct crypto_aead *aead;
struct aead_request *req;
struct scatterlist *sg;
struct scatterlist *sg, *dsg;
struct sk_buff *trailer;
struct page *page;
void *tmp;
u8 *iv;
u8 *tail;
u8 *vaddr;
int blksize;
int clen;
int alen;
@ -149,7 +221,9 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
int nfrags;
int assoclen;
int extralen;
int tailen;
__be64 seqno;
__u8 proto = *skb_mac_header(skb);
/* skb is pure payload to encrypt */
@ -169,12 +243,7 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
clen = ALIGN(skb->len + 2 + tfclen, blksize);
plen = clen - skb->len - tfclen;
err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
if (err < 0)
goto error;
nfrags = err;
tailen = tfclen + plen + alen;
assoclen = sizeof(*esph);
extralen = 0;
@ -183,35 +252,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
assoclen += sizeof(__be32);
}
tmp = esp_alloc_tmp(aead, nfrags, extralen);
if (!tmp) {
err = -ENOMEM;
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);
/* Fill padding... */
tail = skb_tail_pointer(trailer);
if (tfclen) {
memset(tail, 0, tfclen);
tail += tfclen;
}
do {
int i;
for (i = 0; i < plen - 2; i++)
tail[i] = i + 1;
} while (0);
tail[plen - 2] = plen - 2;
tail[plen - 1] = *skb_mac_header(skb);
pskb_put(skb, trailer, clen - skb->len + alen);
skb_push(skb, -skb_network_offset(skb));
esph = ip_esp_hdr(skb);
*skb_mac_header(skb) = IPPROTO_ESP;
esph = ip_esp_hdr(skb);
/* this is non-NULL only with UDP Encapsulation */
if (x->encap) {
@ -230,7 +272,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
uh = (struct udphdr *)esph;
uh->source = sport;
uh->dest = dport;
uh->len = htons(skb->len - skb_transport_offset(skb));
uh->len = htons(skb->len + tailen
- skb_transport_offset(skb));
uh->check = 0;
switch (encap_type) {
@ -248,31 +291,148 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
*skb_mac_header(skb) = IPPROTO_UDP;
}
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
if (!skb_cloned(skb)) {
if (tailen <= skb_availroom(skb)) {
nfrags = 1;
trailer = skb;
tail = skb_tail_pointer(trailer);
aead_request_set_callback(req, 0, esp_output_done, skb);
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;
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
extra->esphoff = (unsigned char *)esph -
skb_transport_header(skb);
esph = (struct ip_esp_hdr *)((unsigned char *)esph - 4);
extra->seqhi = esph->spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
aead_request_set_callback(req, 0, esp_output_done_esn, skb);
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);
vaddr = kmap_atomic(page);
tail = vaddr + pfrag->offset;
esp_output_fill_trailer(tail, tfclen, plen, proto);
kunmap_atomic(vaddr);
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;
nfrags++;
skb->len += tailen;
skb->data_len += tailen;
skb->truesize += tailen;
if (sk)
atomic_add(tailen, &sk->sk_wmem_alloc);
skb_push(skb, -skb_network_offset(skb));
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
esph->spi = x->id.spi;
tmp = esp_alloc_tmp(aead, nfrags + 2, extralen);
if (!tmp) {
spin_unlock_bh(&x->lock);
err = -ENOMEM;
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);
dsg = &sg[nfrags];
esph = esp_output_set_extra(skb, esph, extra);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
spin_unlock_bh(&x->lock);
err = -ENOMEM;
goto error;
}
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;
sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
skb_to_sgvec(skb, dsg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
spin_unlock_bh(&x->lock);
goto skip_cow2;
}
}
cow:
err = skb_cow_data(skb, tailen, &trailer);
if (err < 0)
goto error;
nfrags = err;
tail = skb_tail_pointer(trailer);
esph = ip_esp_hdr(skb);
skip_cow:
esp_output_fill_trailer(tail, tfclen, plen, proto);
pskb_put(skb, trailer, clen - skb->len + alen);
skb_push(skb, -skb_network_offset(skb));
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
esph->spi = x->id.spi;
tmp = esp_alloc_tmp(aead, nfrags, extralen);
if (!tmp) {
err = -ENOMEM;
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);
dsg = sg;
esph = esp_output_set_extra(skb, esph, extra);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
aead_request_set_crypt(req, sg, sg, ivlen + clen, iv);
skip_cow2:
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);
aead_request_set_crypt(req, sg, dsg, ivlen + clen, iv);
aead_request_set_ad(req, assoclen);
seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
@ -298,6 +458,8 @@ static int esp_output(struct xfrm_state *x, struct sk_buff *skb)
esp_output_restore_header(skb);
}
if (sg != dsg)
esp_ssg_unref(x, tmp);
kfree(tmp);
error:
@ -401,6 +563,23 @@ static void esp_input_restore_header(struct sk_buff *skb)
__skb_pull(skb, 4);
}
static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
{
struct xfrm_state *x = xfrm_input_state(skb);
struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* decryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)skb_push(skb, 4);
*seqhi = esph->spi;
esph->spi = esph->seq_no;
esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
}
}
static void esp_input_done_esn(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
@ -437,12 +616,6 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
if (elen <= 0)
goto out;
err = skb_cow_data(skb, 0, &trailer);
if (err < 0)
goto out;
nfrags = err;
assoclen = sizeof(*esph);
seqhilen = 0;
@ -451,6 +624,26 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
assoclen += seqhilen;
}
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:
err = -ENOMEM;
tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
if (!tmp)
@ -462,27 +655,18 @@ static int esp_input(struct xfrm_state *x, struct sk_buff *skb)
req = esp_tmp_req(aead, iv);
sg = esp_req_sg(aead, req);
skb->ip_summed = CHECKSUM_NONE;
esph = (struct ip_esp_hdr *)skb->data;
aead_request_set_callback(req, 0, esp_input_done, skb);
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* decryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)skb_push(skb, 4);
*seqhi = esph->spi;
esph->spi = esph->seq_no;
esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
aead_request_set_callback(req, 0, esp_input_done_esn, skb);
}
esp_input_set_header(skb, seqhi);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg, 0, skb->len);
skb->ip_summed = CHECKSUM_NONE;
if ((x->props.flags & XFRM_STATE_ESN))
aead_request_set_callback(req, 0, esp_input_done_esn, skb);
else
aead_request_set_callback(req, 0, esp_input_done, skb);
aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
aead_request_set_ad(req, assoclen);

8
net/ipv4/xfrm4_state.c
View File

@ -90,11 +90,3 @@ void __init xfrm4_state_init(void)
{
xfrm_state_register_afinfo(&xfrm4_state_afinfo);
}
#if 0
void __exit xfrm4_state_fini(void)
{
xfrm_state_unregister_afinfo(&xfrm4_state_afinfo);
}
#endif /* 0 */

3
net/ipv6/ah6.c
View File

@ -474,6 +474,9 @@ static void ah6_input_done(struct crypto_async_request *base, int err)
int hdr_len = skb_network_header_len(skb);
int ah_hlen = (ah->hdrlen + 2) << 2;
if (err)
goto out;
work_iph = AH_SKB_CB(skb)->tmp;
auth_data = ah_tmp_auth(work_iph, hdr_len);
icv = ah_tmp_icv(ahp->ahash, auth_data, ahp->icv_trunc_len);

320
net/ipv6/esp6.c
View File

@ -44,6 +44,8 @@
#include <net/protocol.h>
#include <linux/icmpv6.h>
#include <linux/highmem.h>
struct esp_skb_cb {
struct xfrm_skb_cb xfrm;
void *tmp;
@ -114,11 +116,40 @@ static inline struct scatterlist *esp_req_sg(struct crypto_aead *aead,
__alignof__(struct scatterlist));
}
static void esp_ssg_unref(struct xfrm_state *x, void *tmp)
{
__be32 *seqhi;
struct crypto_aead *aead = x->data;
int seqhilen = 0;
u8 *iv;
struct aead_request *req;
struct scatterlist *sg;
if (x->props.flags & XFRM_STATE_ESN)
seqhilen += sizeof(__be32);
seqhi = esp_tmp_seqhi(tmp);
iv = esp_tmp_iv(aead, tmp, seqhilen);
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));
}
static void esp_output_done(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
void *tmp;
struct dst_entry *dst = skb_dst(skb);
struct xfrm_state *x = dst->xfrm;
kfree(ESP_SKB_CB(skb)->tmp);
tmp = ESP_SKB_CB(skb)->tmp;
esp_ssg_unref(x, tmp);
kfree(tmp);
xfrm_output_resume(skb, err);
}
@ -138,6 +169,27 @@ static void esp_output_restore_header(struct sk_buff *skb)
esp_restore_header(skb, skb_transport_offset(skb) - sizeof(__be32));
}
static struct ip_esp_hdr *esp_output_set_esn(struct sk_buff *skb,
struct ip_esp_hdr *esph,
__be32 *seqhi)
{
struct xfrm_state *x = skb_dst(skb)->xfrm;
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
*seqhi = esph->spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
}
esph->spi = x->id.spi;
return esph;
}
static void esp_output_done_esn(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
@ -146,14 +198,31 @@ static void esp_output_done_esn(struct crypto_async_request *base, int err)
esp_output_done(base, err);
}
static void esp_output_fill_trailer(u8 *tail, int tfclen, int plen, __u8 proto)
{
/* Fill padding... */
if (tfclen) {
memset(tail, 0, tfclen);
tail += tfclen;
}
do {
int i;
for (i = 0; i < plen - 2; i++)
tail[i] = i + 1;
} while (0);
tail[plen - 2] = plen - 2;
tail[plen - 1] = proto;
}
static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
int err;
struct ip_esp_hdr *esph;
struct crypto_aead *aead;
struct aead_request *req;
struct scatterlist *sg;
struct scatterlist *sg, *dsg;
struct sk_buff *trailer;
struct page *page;
void *tmp;
int blksize;
int clen;
@ -164,10 +233,13 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
int nfrags;
int assoclen;
int seqhilen;
int tailen;
u8 *iv;
u8 *tail;
u8 *vaddr;
__be32 *seqhi;
__be64 seqno;
__u8 proto = *skb_mac_header(skb);
/* skb is pure payload to encrypt */
aead = x->data;
@ -186,11 +258,7 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
blksize = ALIGN(crypto_aead_blocksize(aead), 4);
clen = ALIGN(skb->len + 2 + tfclen, blksize);
plen = clen - skb->len - tfclen;
err = skb_cow_data(skb, tfclen + plen + alen, &trailer);
if (err < 0)
goto error;
nfrags = err;
tailen = tfclen + plen + alen;
assoclen = sizeof(*esph);
seqhilen = 0;
@ -200,6 +268,126 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
assoclen += seqhilen;
}
*skb_mac_header(skb) = IPPROTO_ESP;
esph = ip_esp_hdr(skb);
if (!skb_cloned(skb)) {
if (tailen <= skb_availroom(skb)) {
nfrags = 1;
trailer = skb;
tail = skb_tail_pointer(trailer);
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;
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);
vaddr = kmap_atomic(page);
tail = vaddr + pfrag->offset;
esp_output_fill_trailer(tail, tfclen, plen, proto);
kunmap_atomic(vaddr);
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;
nfrags++;
skb->len += tailen;
skb->data_len += tailen;
skb->truesize += tailen;
if (sk)
atomic_add(tailen, &sk->sk_wmem_alloc);
skb_push(skb, -skb_network_offset(skb));
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
esph->spi = x->id.spi;
tmp = esp_alloc_tmp(aead, nfrags + 2, seqhilen);
if (!tmp) {
spin_unlock_bh(&x->lock);
err = -ENOMEM;
goto error;
}
seqhi = esp_tmp_seqhi(tmp);
iv = esp_tmp_iv(aead, tmp, seqhilen);
req = esp_tmp_req(aead, iv);
sg = esp_req_sg(aead, req);
dsg = &sg[nfrags];
esph = esp_output_set_esn(skb, esph, seqhi);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
allocsize = ALIGN(skb->data_len, L1_CACHE_BYTES);
if (unlikely(!skb_page_frag_refill(allocsize, pfrag, GFP_ATOMIC))) {
spin_unlock_bh(&x->lock);
err = -ENOMEM;
goto error;
}
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;
sg_init_table(dsg, skb_shinfo(skb)->nr_frags + 1);
skb_to_sgvec(skb, dsg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
spin_unlock_bh(&x->lock);
goto skip_cow2;
}
}
cow:
err = skb_cow_data(skb, tailen, &trailer);
if (err < 0)
goto error;
nfrags = err;
tail = skb_tail_pointer(trailer);
esph = ip_esp_hdr(skb);
skip_cow:
esp_output_fill_trailer(tail, tfclen, plen, proto);
pskb_put(skb, trailer, clen - skb->len + alen);
skb_push(skb, -skb_network_offset(skb));
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
esph->spi = x->id.spi;
tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
if (!tmp) {
err = -ENOMEM;
@ -210,49 +398,22 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
iv = esp_tmp_iv(aead, tmp, seqhilen);
req = esp_tmp_req(aead, iv);
sg = esp_req_sg(aead, req);
dsg = sg;
/* Fill padding... */
tail = skb_tail_pointer(trailer);
if (tfclen) {
memset(tail, 0, tfclen);
tail += tfclen;
}
do {
int i;
for (i = 0; i < plen - 2; i++)
tail[i] = i + 1;
} while (0);
tail[plen - 2] = plen - 2;
tail[plen - 1] = *skb_mac_header(skb);
pskb_put(skb, trailer, clen - skb->len + alen);
skb_push(skb, -skb_network_offset(skb));
esph = ip_esp_hdr(skb);
*skb_mac_header(skb) = IPPROTO_ESP;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.low);
aead_request_set_callback(req, 0, esp_output_done, skb);
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* encryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)(skb_transport_header(skb) - sizeof(__be32));
*seqhi = esph->spi;
esph->seq_no = htonl(XFRM_SKB_CB(skb)->seq.output.hi);
aead_request_set_callback(req, 0, esp_output_done_esn, skb);
}
esph->spi = x->id.spi;
esph = esp_output_set_esn(skb, esph, seqhi);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg,
(unsigned char *)esph - skb->data,
assoclen + ivlen + clen + alen);
aead_request_set_crypt(req, sg, sg, ivlen + clen, iv);
skip_cow2:
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);
aead_request_set_crypt(req, sg, dsg, ivlen + clen, iv);
aead_request_set_ad(req, assoclen);
seqno = cpu_to_be64(XFRM_SKB_CB(skb)->seq.output.low +
@ -278,6 +439,8 @@ static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
esp_output_restore_header(skb);
}
if (sg != dsg)
esp_ssg_unref(x, tmp);
kfree(tmp);
error:
@ -343,6 +506,23 @@ static void esp_input_restore_header(struct sk_buff *skb)
__skb_pull(skb, 4);
}
static void esp_input_set_header(struct sk_buff *skb, __be32 *seqhi)
{
struct xfrm_state *x = xfrm_input_state(skb);
struct ip_esp_hdr *esph = (struct ip_esp_hdr *)skb->data;
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* decryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)skb_push(skb, 4);
*seqhi = esph->spi;
esph->spi = esph->seq_no;
esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
}
}
static void esp_input_done_esn(struct crypto_async_request *base, int err)
{
struct sk_buff *skb = base->data;
@ -378,14 +558,6 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
goto out;
}
nfrags = skb_cow_data(skb, 0, &trailer);
if (nfrags < 0) {
ret = -EINVAL;
goto out;
}
ret = -ENOMEM;
assoclen = sizeof(*esph);
seqhilen = 0;
@ -394,6 +566,27 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
assoclen += seqhilen;
}
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;
}
}
nfrags = skb_cow_data(skb, 0, &trailer);
if (nfrags < 0) {
ret = -EINVAL;
goto out;
}
skip_cow:
ret = -ENOMEM;
tmp = esp_alloc_tmp(aead, nfrags, seqhilen);
if (!tmp)
goto out;
@ -404,27 +597,18 @@ static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
req = esp_tmp_req(aead, iv);
sg = esp_req_sg(aead, req);
skb->ip_summed = CHECKSUM_NONE;
esph = (struct ip_esp_hdr *)skb->data;
aead_request_set_callback(req, 0, esp_input_done, skb);
/* For ESN we move the header forward by 4 bytes to
* accomodate the high bits. We will move it back after
* decryption.
*/
if ((x->props.flags & XFRM_STATE_ESN)) {
esph = (void *)skb_push(skb, 4);
*seqhi = esph->spi;
esph->spi = esph->seq_no;
esph->seq_no = XFRM_SKB_CB(skb)->seq.input.hi;
aead_request_set_callback(req, 0, esp_input_done_esn, skb);
}
esp_input_set_header(skb, seqhi);
sg_init_table(sg, nfrags);
skb_to_sgvec(skb, sg, 0, skb->len);
skb->ip_summed = CHECKSUM_NONE;
if ((x->props.flags & XFRM_STATE_ESN))
aead_request_set_callback(req, 0, esp_input_done_esn, skb);
else
aead_request_set_callback(req, 0, esp_input_done, skb);
aead_request_set_crypt(req, sg, sg, elen + ivlen, iv);
aead_request_set_ad(req, assoclen);

12
net/xfrm/xfrm_input.c
View File

@ -21,6 +21,9 @@ static struct kmem_cache *secpath_cachep __read_mostly;
static DEFINE_SPINLOCK(xfrm_input_afinfo_lock);
static struct xfrm_input_afinfo __rcu *xfrm_input_afinfo[NPROTO];
static struct gro_cells gro_cells;
static struct net_device xfrm_napi_dev;
int xfrm_input_register_afinfo(struct xfrm_input_afinfo *afinfo)
{
int err = 0;
@ -371,7 +374,7 @@ resume:
if (decaps) {
skb_dst_drop(skb);
netif_rx(skb);
gro_cells_receive(&gro_cells, skb);
return 0;
} else {
return x->inner_mode->afinfo->transport_finish(skb, async);
@ -394,6 +397,13 @@ EXPORT_SYMBOL(xfrm_input_resume);
void __init xfrm_input_init(void)
{
int err;
init_dummy_netdev(&xfrm_napi_dev);
err = gro_cells_init(&gro_cells, &xfrm_napi_dev);
if (err)
gro_cells.cells = NULL;
secpath_cachep = kmem_cache_create("secpath_cache",
sizeof(struct sec_path),
0, SLAB_HWCACHE_ALIGN|SLAB_PANIC,

8
net/xfrm/xfrm_output.c
View File

@ -246,10 +246,8 @@ void xfrm_local_error(struct sk_buff *skb, int mtu)
return;
afinfo = xfrm_state_get_afinfo(proto);
if (!afinfo)
return;
afinfo->local_error(skb, mtu);
xfrm_state_put_afinfo(afinfo);
if (afinfo)
afinfo->local_error(skb, mtu);
rcu_read_unlock();
}
EXPORT_SYMBOL_GPL(xfrm_local_error);

2
net/xfrm/xfrm_policy.c
View File

@ -330,7 +330,7 @@ void xfrm_policy_destroy(struct xfrm_policy *policy)
}
EXPORT_SYMBOL(xfrm_policy_destroy);
/* Rule must be locked. Release descentant resources, announce
/* Rule must be locked. Release descendant resources, announce
* entry dead. The rule must be unlinked from lists to the moment.
*/

86
net/xfrm/xfrm_state.c
View File

@ -192,7 +192,7 @@ int xfrm_register_type(const struct xfrm_type *type, unsigned short family)
else
err = -EEXIST;
spin_unlock_bh(&xfrm_type_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_register_type);
@ -213,7 +213,7 @@ int xfrm_unregister_type(const struct xfrm_type *type, unsigned short family)
else
typemap[type->proto] = NULL;
spin_unlock_bh(&xfrm_type_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_unregister_type);
@ -231,17 +231,18 @@ retry:
return NULL;
typemap = afinfo->type_map;
type = typemap[proto];
type = READ_ONCE(typemap[proto]);
if (unlikely(type && !try_module_get(type->owner)))
type = NULL;
rcu_read_unlock();
if (!type && !modload_attempted) {
xfrm_state_put_afinfo(afinfo);
request_module("xfrm-type-%d-%d", family, proto);
modload_attempted = 1;
goto retry;
}
xfrm_state_put_afinfo(afinfo);
return type;
}
@ -280,7 +281,7 @@ int xfrm_register_mode(struct xfrm_mode *mode, int family)
out:
spin_unlock_bh(&xfrm_mode_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_register_mode);
@ -308,7 +309,7 @@ int xfrm_unregister_mode(struct xfrm_mode *mode, int family)
}
spin_unlock_bh(&xfrm_mode_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_unregister_mode);
@ -327,17 +328,17 @@ retry:
if (unlikely(afinfo == NULL))
return NULL;
mode = afinfo->mode_map[encap];
mode = READ_ONCE(afinfo->mode_map[encap]);
if (unlikely(mode && !try_module_get(mode->owner)))
mode = NULL;
rcu_read_unlock();
if (!mode && !modload_attempted) {
xfrm_state_put_afinfo(afinfo);
request_module("xfrm-mode-%d-%d", family, encap);
modload_attempted = 1;
goto retry;
}
xfrm_state_put_afinfo(afinfo);
return mode;
}
@ -409,7 +410,7 @@ static enum hrtimer_restart xfrm_timer_handler(struct hrtimer *me)
if (x->xflags & XFRM_SOFT_EXPIRE) {
/* enter hard expire without soft expire first?!
* setting a new date could trigger this.
* workarbound: fix x->curflt.add_time by below:
* workaround: fix x->curflt.add_time by below:
*/
x->curlft.add_time = now - x->saved_tmo - 1;
tmo = x->lft.hard_add_expires_seconds - x->saved_tmo;
@ -639,26 +640,25 @@ void xfrm_sad_getinfo(struct net *net, struct xfrmk_sadinfo *si)
}
EXPORT_SYMBOL(xfrm_sad_getinfo);
static int
static void
xfrm_init_tempstate(struct xfrm_state *x, const struct flowi *fl,
const struct xfrm_tmpl *tmpl,
const xfrm_address_t *daddr, const xfrm_address_t *saddr,
unsigned short family)
{
struct xfrm_state_afinfo *afinfo = xfrm_state_get_afinfo(family);
struct xfrm_state_afinfo *afinfo = xfrm_state_afinfo_get_rcu(family);
if (!afinfo)
return -1;
return;
afinfo->init_tempsel(&x->sel, fl);
if (family != tmpl->encap_family) {
xfrm_state_put_afinfo(afinfo);
afinfo = xfrm_state_get_afinfo(tmpl->encap_family);
afinfo = xfrm_state_afinfo_get_rcu(tmpl->encap_family);
if (!afinfo)
return -1;
return;
}
afinfo->init_temprop(x, tmpl, daddr, saddr);
xfrm_state_put_afinfo(afinfo);
return 0;
}
static struct xfrm_state *__xfrm_state_lookup(struct net *net, u32 mark,
@ -1474,7 +1474,7 @@ xfrm_tmpl_sort(struct xfrm_tmpl **dst, struct xfrm_tmpl **src, int n,
if (afinfo->tmpl_sort)
err = afinfo->tmpl_sort(dst, src, n);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_tmpl_sort);
@ -1494,7 +1494,7 @@ xfrm_state_sort(struct xfrm_state **dst, struct xfrm_state **src, int n,
if (afinfo->state_sort)
err = afinfo->state_sort(dst, src, n);
spin_unlock_bh(&net->xfrm.xfrm_state_lock);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
return err;
}
EXPORT_SYMBOL(xfrm_state_sort);
@ -1932,10 +1932,10 @@ EXPORT_SYMBOL(xfrm_unregister_km);
int xfrm_state_register_afinfo(struct xfrm_state_afinfo *afinfo)
{
int err = 0;
if (unlikely(afinfo == NULL))
return -EINVAL;
if (unlikely(afinfo->family >= NPROTO))
if (WARN_ON(afinfo->family >= NPROTO))
return -EAFNOSUPPORT;
spin_lock_bh(&xfrm_state_afinfo_lock);
if (unlikely(xfrm_state_afinfo[afinfo->family] != NULL))
err = -EEXIST;
@ -1948,14 +1948,14 @@ EXPORT_SYMBOL(xfrm_state_register_afinfo);
int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
{
int err = 0;
if (unlikely(afinfo == NULL))
return -EINVAL;
if (unlikely(afinfo->family >= NPROTO))
int err = 0, family = afinfo->family;
if (WARN_ON(family >= NPROTO))
return -EAFNOSUPPORT;
spin_lock_bh(&xfrm_state_afinfo_lock);
if (likely(xfrm_state_afinfo[afinfo->family] != NULL)) {
if (unlikely(xfrm_state_afinfo[afinfo->family] != afinfo))
if (rcu_access_pointer(xfrm_state_afinfo[family]) != afinfo)
err = -EINVAL;
else
RCU_INIT_POINTER(xfrm_state_afinfo[afinfo->family], NULL);
@ -1966,6 +1966,14 @@ int xfrm_state_unregister_afinfo(struct xfrm_state_afinfo *afinfo)
}
EXPORT_SYMBOL(xfrm_state_unregister_afinfo);
struct xfrm_state_afinfo *xfrm_state_afinfo_get_rcu(unsigned int family)
{
if (unlikely(family >= NPROTO))
return NULL;
return rcu_dereference(xfrm_state_afinfo[family]);
}
struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
{
struct xfrm_state_afinfo *afinfo;
@ -1978,11 +1986,6 @@ struct xfrm_state_afinfo *xfrm_state_get_afinfo(unsigned int family)
return afinfo;
}
void xfrm_state_put_afinfo(struct xfrm_state_afinfo *afinfo)
{
rcu_read_unlock();
}
/* Temporarily located here until net/xfrm/xfrm_tunnel.c is created */
void xfrm_state_delete_tunnel(struct xfrm_state *x)
{
@ -2000,16 +2003,13 @@ EXPORT_SYMBOL(xfrm_state_delete_tunnel);
int xfrm_state_mtu(struct xfrm_state *x, int mtu)
{
int res;
const struct xfrm_type *type = READ_ONCE(x->type);
spin_lock_bh(&x->lock);
if (x->km.state == XFRM_STATE_VALID &&
x->type && x->type->get_mtu)
res = x->type->get_mtu(x, mtu);
else
res = mtu - x->props.header_len;
spin_unlock_bh(&x->lock);
return res;
type && type->get_mtu)
return type->get_mtu(x, mtu);
return mtu - x->props.header_len;
}
int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
@ -2028,7 +2028,7 @@ int __xfrm_init_state(struct xfrm_state *x, bool init_replay)
if (afinfo->init_flags)
err = afinfo->init_flags(x);
xfrm_state_put_afinfo(afinfo);
rcu_read_unlock();
if (err)
goto error;