#include <linux/config.h>
#include <linux/module.h>
-#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/esp.h>
#include <asm/scatterlist.h>
#include <linux/crypto.h>
+#include <linux/kernel.h>
#include <linux/pfkeyv2.h>
#include <linux/random.h>
#include <net/icmp.h>
#include <net/ipv6.h>
+#include <net/protocol.h>
#include <linux/icmpv6.h>
-int esp6_output(struct sk_buff **pskb)
+static int esp6_output(struct xfrm_state *x, struct sk_buff *skb)
{
int err;
- int hdr_len = 0;
- struct dst_entry *dst = (*pskb)->dst;
- struct xfrm_state *x = dst->xfrm;
- struct ipv6hdr *iph = NULL, *top_iph;
+ int hdr_len;
+ struct ipv6hdr *top_iph;
struct ipv6_esp_hdr *esph;
struct crypto_tfm *tfm;
struct esp_data *esp;
int clen;
int alen;
int nfrags;
- u8 *prevhdr;
- u8 nexthdr = 0;
- if ((*pskb)->ip_summed == CHECKSUM_HW) {
- err = skb_checksum_help(pskb, 0);
- if (err)
- goto error_nolock;
- }
+ esp = x->data;
+ hdr_len = skb->h.raw - skb->data +
+ sizeof(*esph) + esp->conf.ivlen;
- spin_lock_bh(&x->lock);
- err = xfrm_state_check(x, *pskb);
- if (err)
- goto error;
-
- if (x->props.mode) {
- err = xfrm6_tunnel_check_size(*pskb);
- if (err)
- goto error;
- } else {
- /* Strip IP header in transport mode. Save it. */
- hdr_len = ip6_find_1stfragopt(*pskb, &prevhdr);
- nexthdr = *prevhdr;
- *prevhdr = IPPROTO_ESP;
- iph = kmalloc(hdr_len, GFP_ATOMIC);
- if (!iph) {
- err = -ENOMEM;
- goto error;
- }
- memcpy(iph, (*pskb)->nh.raw, hdr_len);
- __skb_pull(*pskb, hdr_len);
- }
+ /* Strip IP+ESP header. */
+ __skb_pull(skb, hdr_len);
/* Now skb is pure payload to encrypt */
err = -ENOMEM;
/* Round to block size */
- clen = (*pskb)->len;
+ clen = skb->len;
- esp = x->data;
alen = esp->auth.icv_trunc_len;
tfm = esp->conf.tfm;
- blksize = (crypto_tfm_alg_blocksize(tfm) + 3) & ~3;
- clen = (clen + 2 + blksize-1)&~(blksize-1);
+ blksize = ALIGN(crypto_tfm_alg_blocksize(tfm), 4);
+ clen = ALIGN(clen + 2, blksize);
if (esp->conf.padlen)
- clen = (clen + esp->conf.padlen-1)&~(esp->conf.padlen-1);
+ clen = ALIGN(clen, esp->conf.padlen);
- if ((nfrags = skb_cow_data(*pskb, clen-(*pskb)->len+alen, &trailer)) < 0) {
- if (!x->props.mode && iph) kfree(iph);
+ if ((nfrags = skb_cow_data(skb, clen-skb->len+alen, &trailer)) < 0) {
goto error;
}
/* Fill padding... */
do {
int i;
- for (i=0; i<clen-(*pskb)->len - 2; i++)
+ for (i=0; i<clen-skb->len - 2; i++)
*(u8*)(trailer->tail + i) = i+1;
} while (0);
- *(u8*)(trailer->tail + clen-(*pskb)->len - 2) = (clen - (*pskb)->len)-2;
- pskb_put(*pskb, trailer, clen - (*pskb)->len);
+ *(u8*)(trailer->tail + clen-skb->len - 2) = (clen - skb->len)-2;
+ pskb_put(skb, trailer, clen - skb->len);
- if (x->props.mode) {
- iph = (*pskb)->nh.ipv6h;
- top_iph = (struct ipv6hdr*)skb_push(*pskb, x->props.header_len);
- esph = (struct ipv6_esp_hdr*)(top_iph+1);
- *(u8*)(trailer->tail - 1) = IPPROTO_IPV6;
- top_iph->version = 6;
- top_iph->priority = iph->priority;
- top_iph->flow_lbl[0] = iph->flow_lbl[0];
- top_iph->flow_lbl[1] = iph->flow_lbl[1];
- top_iph->flow_lbl[2] = iph->flow_lbl[2];
- if (x->props.flags & XFRM_STATE_NOECN)
- IP6_ECN_clear(top_iph);
- top_iph->nexthdr = IPPROTO_ESP;
- top_iph->payload_len = htons((*pskb)->len + alen - sizeof(struct ipv6hdr));
- top_iph->hop_limit = iph->hop_limit;
- ipv6_addr_copy(&top_iph->saddr,
- (struct in6_addr *)&x->props.saddr);
- ipv6_addr_copy(&top_iph->daddr,
- (struct in6_addr *)&x->id.daddr);
- } else {
- esph = (struct ipv6_esp_hdr*)skb_push(*pskb, x->props.header_len);
- (*pskb)->h.raw = (unsigned char*)esph;
- top_iph = (struct ipv6hdr*)skb_push(*pskb, hdr_len);
- memcpy(top_iph, iph, hdr_len);
- kfree(iph);
- top_iph->payload_len = htons((*pskb)->len + alen - sizeof(struct ipv6hdr));
- *(u8*)(trailer->tail - 1) = nexthdr;
- }
+ top_iph = (struct ipv6hdr *)__skb_push(skb, hdr_len);
+ esph = (struct ipv6_esp_hdr *)skb->h.raw;
+ top_iph->payload_len = htons(skb->len + alen - sizeof(*top_iph));
+ *(u8*)(trailer->tail - 1) = *skb->nh.raw;
+ *skb->nh.raw = IPPROTO_ESP;
esph->spi = x->id.spi;
esph->seq_no = htonl(++x->replay.oseq);
+ xfrm_aevent_doreplay(x);
if (esp->conf.ivlen)
crypto_cipher_set_iv(tfm, esp->conf.ivec, crypto_tfm_alg_ivsize(tfm));
if (!sg)
goto error;
}
- skb_to_sgvec(*pskb, sg, esph->enc_data+esp->conf.ivlen-(*pskb)->data, clen);
+ skb_to_sgvec(skb, sg, esph->enc_data+esp->conf.ivlen-skb->data, clen);
crypto_cipher_encrypt(tfm, sg, sg, clen);
if (unlikely(sg != &esp->sgbuf[0]))
kfree(sg);
}
if (esp->auth.icv_full_len) {
- esp->auth.icv(esp, *pskb, (u8*)esph-(*pskb)->data,
+ esp->auth.icv(esp, skb, (u8*)esph-skb->data,
sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen+clen, trailer->tail);
- pskb_put(*pskb, trailer, alen);
+ pskb_put(skb, trailer, alen);
}
- (*pskb)->nh.raw = (*pskb)->data;
-
- x->curlft.bytes += (*pskb)->len;
- x->curlft.packets++;
- spin_unlock_bh(&x->lock);
- if (((*pskb)->dst = dst_pop(dst)) == NULL) {
- err = -EHOSTUNREACH;
- goto error_nolock;
- }
- return NET_XMIT_BYPASS;
+ err = 0;
error:
- spin_unlock_bh(&x->lock);
-error_nolock:
- kfree_skb(*pskb);
return err;
}
-int esp6_input(struct xfrm_state *x, struct xfrm_decap_state *decap, struct sk_buff *skb)
+static int esp6_input(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *iph;
struct ipv6_esp_hdr *esph;
struct esp_data *esp = x->data;
struct sk_buff *trailer;
- int blksize = crypto_tfm_alg_blocksize(esp->conf.tfm);
+ int blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
int alen = esp->auth.icv_trunc_len;
int elen = skb->len - sizeof(struct ipv6_esp_hdr) - esp->conf.ivlen - alen;
u8 nexthdr[2];
struct scatterlist *sg = &esp->sgbuf[0];
u8 padlen;
- u8 *prevhdr;
if (unlikely(nfrags > ESP_NUM_FAST_SG)) {
sg = kmalloc(sizeof(struct scatterlist)*nfrags, GFP_ATOMIC);
padlen = nexthdr[0];
if (padlen+2 >= elen) {
- LIMIT_NETDEBUG(
- printk(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen));
+ LIMIT_NETDEBUG(KERN_WARNING "ipsec esp packet is garbage padlen=%d, elen=%d\n", padlen+2, elen);
ret = -EINVAL;
goto out;
}
skb->nh.raw += sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
memcpy(skb->nh.raw, tmp_hdr, hdr_len);
skb->nh.ipv6h->payload_len = htons(skb->len - sizeof(struct ipv6hdr));
- ip6_find_1stfragopt(skb, &prevhdr);
- ret = *prevhdr = nexthdr[1];
+ ret = nexthdr[1];
}
out:
static u32 esp6_get_max_size(struct xfrm_state *x, int mtu)
{
struct esp_data *esp = x->data;
- u32 blksize = crypto_tfm_alg_blocksize(esp->conf.tfm);
+ u32 blksize = ALIGN(crypto_tfm_alg_blocksize(esp->conf.tfm), 4);
if (x->props.mode) {
- mtu = (mtu + 2 + blksize-1)&~(blksize-1);
+ mtu = ALIGN(mtu + 2, blksize);
} else {
/* The worst case. */
- mtu += 2 + blksize;
+ u32 padsize = ((blksize - 1) & 7) + 1;
+ mtu = ALIGN(mtu + 2, padsize) + blksize - padsize;
}
if (esp->conf.padlen)
- mtu = (mtu + esp->conf.padlen-1)&~(esp->conf.padlen-1);
+ mtu = ALIGN(mtu, esp->conf.padlen);
- return mtu + x->props.header_len + esp->auth.icv_full_len;
+ return mtu + x->props.header_len + esp->auth.icv_trunc_len;
}
-void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
- int type, int code, int offset, __u32 info)
+static void esp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
+ int type, int code, int offset, __u32 info)
{
struct ipv6hdr *iph = (struct ipv6hdr*)skb->data;
struct ipv6_esp_hdr *esph = (struct ipv6_esp_hdr*)(skb->data+offset);
x = xfrm_state_lookup((xfrm_address_t *)&iph->daddr, esph->spi, IPPROTO_ESP, AF_INET6);
if (!x)
return;
- printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/"
- "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
+ printk(KERN_DEBUG "pmtu discovery on SA ESP/%08x/" NIP6_FMT "\n",
ntohl(esph->spi), NIP6(iph->daddr));
xfrm_state_put(x);
}
-void esp6_destroy(struct xfrm_state *x)
+static void esp6_destroy(struct xfrm_state *x)
{
struct esp_data *esp = x->data;
if (!esp)
return;
- if (esp->conf.tfm) {
- crypto_free_tfm(esp->conf.tfm);
- esp->conf.tfm = NULL;
- }
- if (esp->conf.ivec) {
- kfree(esp->conf.ivec);
- esp->conf.ivec = NULL;
- }
- if (esp->auth.tfm) {
- crypto_free_tfm(esp->auth.tfm);
- esp->auth.tfm = NULL;
- }
- if (esp->auth.work_icv) {
- kfree(esp->auth.work_icv);
- esp->auth.work_icv = NULL;
- }
+ crypto_free_tfm(esp->conf.tfm);
+ esp->conf.tfm = NULL;
+ kfree(esp->conf.ivec);
+ esp->conf.ivec = NULL;
+ crypto_free_tfm(esp->auth.tfm);
+ esp->auth.tfm = NULL;
+ kfree(esp->auth.work_icv);
+ esp->auth.work_icv = NULL;
kfree(esp);
}
-int esp6_init_state(struct xfrm_state *x, void *args)
+static int esp6_init_state(struct xfrm_state *x)
{
struct esp_data *esp = NULL;
+ /* null auth and encryption can have zero length keys */
if (x->aalg) {
- if (x->aalg->alg_key_len == 0 || x->aalg->alg_key_len > 512)
+ if (x->aalg->alg_key_len > 512)
goto error;
}
if (x->ealg == NULL)
goto error;
- esp = kmalloc(sizeof(*esp), GFP_KERNEL);
+ if (x->encap)
+ goto error;
+
+ esp = kzalloc(sizeof(*esp), GFP_KERNEL);
if (esp == NULL)
return -ENOMEM;
- memset(esp, 0, sizeof(*esp));
-
if (x->aalg) {
struct xfrm_algo_desc *aalg_desc;
goto error;
esp->auth.icv = esp_hmac_digest;
- aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name);
+ aalg_desc = xfrm_aalg_get_byname(x->aalg->alg_name, 0);
BUG_ON(!aalg_desc);
if (aalg_desc->uinfo.auth.icv_fullbits/8 !=
goto error;
get_random_bytes(esp->conf.ivec, esp->conf.ivlen);
}
- crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len);
+ if (crypto_cipher_setkey(esp->conf.tfm, esp->conf.key, esp->conf.key_len))
+ goto error;
x->props.header_len = sizeof(struct ipv6_esp_hdr) + esp->conf.ivlen;
if (x->props.mode)
x->props.header_len += sizeof(struct ipv6hdr);
return 0;
error:
- if (esp) {
- if (esp->auth.tfm)
- crypto_free_tfm(esp->auth.tfm);
- if (esp->auth.work_icv)
- kfree(esp->auth.work_icv);
- if (esp->conf.tfm)
- crypto_free_tfm(esp->conf.tfm);
- kfree(esp);
- }
+ x->data = esp;
+ esp6_destroy(x);
+ x->data = NULL;
return -EINVAL;
}
.flags = INET6_PROTO_NOPOLICY,
};
-int __init esp6_init(void)
+static int __init esp6_init(void)
{
if (xfrm_register_type(&esp6_type, AF_INET6) < 0) {
printk(KERN_INFO "ipv6 esp init: can't add xfrm type\n");
git://git.onelab.eu / linux-2.6.git / blobdiff