#include <net/ip.h>
#include <net/xfrm.h>
+static void xfrm4_beet_make_header(struct sk_buff *skb)
+{
+ struct iphdr *iph = ip_hdr(skb);
+
+ iph->ihl = 5;
+ iph->version = 4;
+
+ iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
+ iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
+
+ iph->id = XFRM_MODE_SKB_CB(skb)->id;
+ iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
+ iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
+}
+
/* Add encapsulation header.
*
* The top IP header will be constructed per draft-nikander-esp-beet-mode-06.txt.
- * The following fields in it shall be filled in by x->type->output:
- * tot_len
- * check
- *
- * On exit, skb->h will be set to the start of the payload to be processed
- * by x->type->output and skb->nh will be set to the top IP header.
*/
static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
- struct iphdr *iph, *top_iph = NULL;
+ struct ip_beet_phdr *ph;
+ struct iphdr *top_iph;
int hdrlen, optlen;
- iph = skb->nh.iph;
- skb->h.ipiph = iph;
-
hdrlen = 0;
- optlen = iph->ihl * 4 - sizeof(*iph);
+ optlen = XFRM_MODE_SKB_CB(skb)->optlen;
if (unlikely(optlen))
hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
- skb_push(skb, x->props.header_len + hdrlen);
- skb_reset_network_header(skb);
- top_iph = skb->nh.iph;
- skb->h.raw += sizeof(*iph) - hdrlen;
+ skb_set_network_header(skb, -x->props.header_len -
+ hdrlen + (XFRM_MODE_SKB_CB(skb)->ihl - sizeof(*top_iph)));
+ if (x->sel.family != AF_INET6)
+ skb->network_header += IPV4_BEET_PHMAXLEN;
+ skb->mac_header = skb->network_header +
+ offsetof(struct iphdr, protocol);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
- memmove(top_iph, iph, sizeof(*iph));
- if (unlikely(optlen)) {
- struct ip_beet_phdr *ph;
+ xfrm4_beet_make_header(skb);
+ ph = (struct ip_beet_phdr *)
+ __skb_pull(skb, XFRM_MODE_SKB_CB(skb)->ihl - hdrlen);
+
+ top_iph = ip_hdr(skb);
+
+ if (unlikely(optlen)) {
BUG_ON(optlen < 0);
- ph = (struct ip_beet_phdr *)skb->h.raw;
ph->padlen = 4 - (optlen & 4);
ph->hdrlen = optlen / 8;
ph->nexthdr = top_iph->protocol;
static int xfrm4_beet_input(struct xfrm_state *x, struct sk_buff *skb)
{
- struct iphdr *iph = skb->nh.iph;
- int phlen = 0;
+ struct iphdr *iph;
int optlen = 0;
- __u8 ph_nexthdr = 0, protocol = 0;
int err = -EINVAL;
- protocol = iph->protocol;
-
- if (unlikely(iph->protocol == IPPROTO_BEETPH)) {
+ if (unlikely(XFRM_MODE_SKB_CB(skb)->protocol == IPPROTO_BEETPH)) {
struct ip_beet_phdr *ph;
+ int phlen;
if (!pskb_may_pull(skb, sizeof(*ph)))
goto out;
- ph = (struct ip_beet_phdr *)(skb->h.ipiph + 1);
+
+ ph = (struct ip_beet_phdr *)skb->data;
phlen = sizeof(*ph) + ph->padlen;
optlen = ph->hdrlen * 8 + (IPV4_BEET_PHMAXLEN - phlen);
if (optlen < 0 || optlen & 3 || optlen > 250)
goto out;
- if (!pskb_may_pull(skb, phlen + optlen))
- goto out;
- skb->len -= phlen + optlen;
+ XFRM_MODE_SKB_CB(skb)->protocol = ph->nexthdr;
- ph_nexthdr = ph->nexthdr;
+ if (!pskb_may_pull(skb, phlen))
+ goto out;
+ __skb_pull(skb, phlen);
}
- skb->nh.raw = skb->data + (phlen - sizeof(*iph));
- memmove(skb->nh.raw, iph, sizeof(*iph));
- skb->h.raw = skb->data + (phlen + optlen);
- skb->data = skb->h.raw;
+ skb_push(skb, sizeof(*iph));
+ skb_reset_network_header(skb);
+
+ memmove(skb->data - skb->mac_len, skb_mac_header(skb),
+ skb->mac_len);
+ skb_set_mac_header(skb, -skb->mac_len);
+
+ xfrm4_beet_make_header(skb);
+
+ iph = ip_hdr(skb);
- iph = skb->nh.iph;
- iph->ihl = (sizeof(*iph) + optlen) / 4;
- iph->tot_len = htons(skb->len + iph->ihl * 4);
+ iph->ihl += optlen / 4;
+ iph->tot_len = htons(skb->len);
iph->daddr = x->sel.daddr.a4;
iph->saddr = x->sel.saddr.a4;
- if (ph_nexthdr)
- iph->protocol = ph_nexthdr;
- else
- iph->protocol = protocol;
iph->check = 0;
- iph->check = ip_fast_csum(skb->nh.raw, iph->ihl);
+ iph->check = ip_fast_csum(skb_network_header(skb), iph->ihl);
err = 0;
out:
return err;
}
static struct xfrm_mode xfrm4_beet_mode = {
- .input = xfrm4_beet_input,
- .output = xfrm4_beet_output,
+ .input2 = xfrm4_beet_input,
+ .input = xfrm_prepare_input,
+ .output2 = xfrm4_beet_output,
+ .output = xfrm4_prepare_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_BEET,
+ .flags = XFRM_MODE_FLAG_TUNNEL,
};
static int __init xfrm4_beet_init(void)