*/
#include <linux/config.h>
#include <linux/module.h>
-#include <net/inet_ecn.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/ipcomp.h>
{
int err = 0;
u8 nexthdr = 0;
- u8 *prevhdr;
int hdr_len = skb->h.raw - skb->nh.raw;
unsigned char *tmp_hdr = NULL;
struct ipv6hdr *iph;
iph = skb->nh.ipv6h;
iph->payload_len = htons(skb->len);
- ip6_find_1stfragopt(skb, &prevhdr);
- *prevhdr = nexthdr;
out:
if (tmp_hdr)
kfree(tmp_hdr);
int err;
struct dst_entry *dst = (*pskb)->dst;
struct xfrm_state *x = dst->xfrm;
- struct ipv6hdr *tmp_iph = NULL, *iph, *top_iph;
- int hdr_len = 0;
+ struct ipv6hdr *top_iph;
+ int hdr_len;
struct ipv6_comp_hdr *ipch;
struct ipcomp_data *ipcd = x->data;
- u8 *prevhdr;
- u8 nexthdr = 0;
int plen, dlen;
u8 *start, *scratch = ipcd->scratch;
- if ((*pskb)->ip_summed == CHECKSUM_HW) {
- err = skb_checksum_help(pskb, 0);
- if (err)
- goto error_nolock;
- }
-
- spin_lock_bh(&x->lock);
-
- err = xfrm_check_output(x, *pskb, AF_INET6);
- if (err)
- goto error;
-
- if (x->props.mode) {
- hdr_len = sizeof(struct ipv6hdr);
- nexthdr = IPPROTO_IPV6;
- iph = (*pskb)->nh.ipv6h;
- top_iph = (struct ipv6hdr *)skb_push(*pskb, sizeof(struct ipv6hdr));
- 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];
- top_iph->nexthdr = IPPROTO_IPV6; /* initial */
- top_iph->payload_len = htons((*pskb)->len - sizeof(struct ipv6hdr));
- top_iph->hop_limit = iph->hop_limit;
- memcpy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr, sizeof(struct in6_addr));
- memcpy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr, sizeof(struct in6_addr));
- (*pskb)->nh.raw = (*pskb)->data; /* == top_iph */
- (*pskb)->h.raw = (*pskb)->nh.raw + hdr_len;
- } else {
- hdr_len = ip6_find_1stfragopt(*pskb, &prevhdr);
- nexthdr = *prevhdr;
- }
+ hdr_len = (*pskb)->h.raw - (*pskb)->data;
/* check whether datagram len is larger than threshold */
if (((*pskb)->len - hdr_len) < ipcd->threshold) {
/* compression */
plen = (*pskb)->len - hdr_len;
dlen = IPCOMP_SCRATCH_SIZE;
- start = (*pskb)->data + hdr_len;
+ start = (*pskb)->h.raw;
err = crypto_comp_compress(ipcd->tfm, start, plen, scratch, &dlen);
if (err) {
if ((dlen + sizeof(struct ipv6_comp_hdr)) >= plen) {
goto out_ok;
}
- memcpy(start, scratch, dlen);
- pskb_trim(*pskb, hdr_len+dlen);
+ memcpy(start + sizeof(struct ip_comp_hdr), scratch, dlen);
+ pskb_trim(*pskb, hdr_len + dlen + sizeof(struct ip_comp_hdr));
/* insert ipcomp header and replace datagram */
- tmp_iph = kmalloc(hdr_len, GFP_ATOMIC);
- if (!tmp_iph) {
- err = -ENOMEM;
- goto error;
- }
- memcpy(tmp_iph, (*pskb)->nh.raw, hdr_len);
- top_iph = (struct ipv6hdr*)skb_push(*pskb, sizeof(struct ipv6_comp_hdr));
- memcpy(top_iph, tmp_iph, hdr_len);
- kfree(tmp_iph);
+ top_iph = (struct ipv6hdr *)(*pskb)->data;
- if (x->props.mode && (x->props.flags & XFRM_STATE_NOECN))
- IP6_ECN_clear(top_iph);
top_iph->payload_len = htons((*pskb)->len - sizeof(struct ipv6hdr));
- (*pskb)->nh.raw = (*pskb)->data; /* top_iph */
- ip6_find_1stfragopt(*pskb, &prevhdr);
- *prevhdr = IPPROTO_COMP;
- ipch = (struct ipv6_comp_hdr *)((unsigned char *)top_iph + hdr_len);
- ipch->nexthdr = nexthdr;
+ ipch = (struct ipv6_comp_hdr *)start;
+ ipch->nexthdr = *(*pskb)->nh.raw;
ipch->flags = 0;
ipch->cpi = htons((u16 )ntohl(x->id.spi));
+ *(*pskb)->nh.raw = IPPROTO_COMP;
- (*pskb)->h.raw = (unsigned char*)ipch;
out_ok:
- 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;
- }
- err = NET_XMIT_BYPASS;
+ err = 0;
-out_exit:
- return err;
error:
- spin_unlock_bh(&x->lock);
-error_nolock:
- kfree_skb(*pskb);
- goto out_exit;
+ return err;
}
static void ipcomp6_err(struct sk_buff *skb, struct inet6_skb_parm *opt,
struct ipv6_comp_hdr *ipcomph = (struct ipv6_comp_hdr*)(skb->data+offset);
struct xfrm_state *x;
- if (type != ICMPV6_DEST_UNREACH || type != ICMPV6_PKT_TOOBIG)
+ if (type != ICMPV6_DEST_UNREACH && type != ICMPV6_PKT_TOOBIG)
return;
spi = ntohl(ntohs(ipcomph->cpi));
xfrm_state_put(x);
}
+static struct xfrm_state *ipcomp6_tunnel_create(struct xfrm_state *x)
+{
+ struct xfrm_state *t = NULL;
+
+ t = xfrm_state_alloc();
+ if (!t)
+ goto out;
+
+ t->id.proto = IPPROTO_IPV6;
+ t->id.spi = xfrm6_tunnel_alloc_spi((xfrm_address_t *)&x->props.saddr);
+ memcpy(t->id.daddr.a6, x->id.daddr.a6, sizeof(struct in6_addr));
+ memcpy(&t->sel, &x->sel, sizeof(t->sel));
+ t->props.family = AF_INET6;
+ t->props.mode = 1;
+ memcpy(t->props.saddr.a6, x->props.saddr.a6, sizeof(struct in6_addr));
+
+ t->type = xfrm_get_type(IPPROTO_IPV6, t->props.family);
+ if (t->type == NULL)
+ goto error;
+
+ if (t->type->init_state(t, NULL))
+ goto error;
+
+ t->km.state = XFRM_STATE_VALID;
+ atomic_set(&t->tunnel_users, 1);
+
+out:
+ return t;
+
+error:
+ xfrm_state_put(t);
+ goto out;
+}
+
+static int ipcomp6_tunnel_attach(struct xfrm_state *x)
+{
+ int err = 0;
+ struct xfrm_state *t = NULL;
+ u32 spi;
+
+ spi = xfrm6_tunnel_spi_lookup((xfrm_address_t *)&x->props.saddr);
+ if (spi)
+ t = xfrm_state_lookup((xfrm_address_t *)&x->id.daddr,
+ spi, IPPROTO_IPV6, AF_INET6);
+ if (!t) {
+ t = ipcomp6_tunnel_create(x);
+ if (!t) {
+ err = -EINVAL;
+ goto out;
+ }
+ xfrm_state_insert(t);
+ xfrm_state_hold(t);
+ }
+ x->tunnel = t;
+ atomic_inc(&t->tunnel_users);
+
+out:
+ return err;
+}
+
static void ipcomp6_free_data(struct ipcomp_data *ipcd)
{
if (ipcd->tfm)
struct ipcomp_data *ipcd = x->data;
if (!ipcd)
return;
+ xfrm_state_delete_tunnel(x);
ipcomp6_free_data(ipcd);
kfree(ipcd);
+
+ xfrm6_tunnel_free_spi((xfrm_address_t *)&x->props.saddr);
}
static int ipcomp6_init_state(struct xfrm_state *x, void *args)
goto error;
memset(ipcd, 0, sizeof(*ipcd));
- x->props.header_len = sizeof(struct ipv6_comp_hdr);
+ x->props.header_len = 0;
if (x->props.mode)
x->props.header_len += sizeof(struct ipv6hdr);
if (!ipcd->tfm)
goto error;
+ if (x->props.mode) {
+ err = ipcomp6_tunnel_attach(x);
+ if (err)
+ goto error;
+ }
+
calg_desc = xfrm_calg_get_byname(x->calg->alg_name);
BUG_ON(!calg_desc);
ipcd->threshold = calg_desc->uinfo.comp.threshold;
git://git.onelab.eu / linux-2.6.git / blobdiff