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Date: Wed, 6 Dec 2006 20:35:40 +0900
From: Kazunori MIYAZAWA <kazunori@...azawa.org>
To: David Miller <davem@...emloft.net>
Cc: miika@....fi, Diego.Beltrami@...t.fi, herbert@...dor.apana.org.au,
netdev@...r.kernel.org, usagi-core@...ux-ipv6.org
Subject: Re: [PATCH][IPSEC][5/7] inter address family ipsec tunnel
On Thu, 30 Nov 2006 16:49:03 -0800 (PST)
David Miller <davem@...emloft.net> wrote:
> From: Kazunori MIYAZAWA <kazunori@...azawa.org>
> Date: Fri, 24 Nov 2006 14:38:52 +0900
>
> > +static inline void ip6ip_ecn_decapsulate(struct sk_buff *skb)
> > +{
> > + if (INET_ECN_is_ce(ipv6_get_dsfield(skb->nh.ipv6h)))
> > + IP_ECN_set_ce(skb->h.ipiph);
> > +}
> > +
>
> Please fix this extra tab indentation :-)
>
> Thank you.
>
I fixed. As mentioned in another mail, I mixed up the changes
in my previous patch. This adds "IPv6 over IPv4 IPsec tunnel".
The fix of extra tab is included in another mail.
Signed-off-by: Miika Komu <miika@....fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@...t.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@...ux-ipv6.org>
---
net/ipv4/xfrm4_mode_tunnel.c | 57 ++++++++++++++++++++++++++++++++++--------
net/ipv6/xfrm6_policy.c | 48 +++++++++++++++++++++++++----------
2 files changed, 80 insertions(+), 25 deletions(-)
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index e23c21d..e54c549 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -23,6 +23,12 @@ static inline void ipip_ecn_decapsulate(
IP_ECN_set_ce(inner_iph);
}
+static inline void ipip6_ecn_decapsulate(struct iphdr *iph, struct sk_buff *skb)
+{
+ if (INET_ECN_is_ce(iph->tos))
+ IP6_ECN_set_ce(skb->nh.ipv6h);
+}
+
/* Add encapsulation header.
*
* The top IP header will be constructed per RFC 2401. The following fields
@@ -36,6 +42,7 @@ static inline void ipip_ecn_decapsulate(
static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct dst_entry *dst = skb->dst;
+ struct xfrm_dst *xdst = (struct xfrm_dst*)dst;
struct iphdr *iph, *top_iph;
int flags;
@@ -48,15 +55,27 @@ static int xfrm4_tunnel_output(struct xf
top_iph->ihl = 5;
top_iph->version = 4;
+ flags = x->props.flags;
+
/* DS disclosed */
- top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
+ if (xdst->route->ops->family == AF_INET) {
+ top_iph->protocol = IPPROTO_IPIP;
+ top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
+ top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
+ 0 : (iph->frag_off & htons(IP_DF));
+ }
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ else {
+ struct ipv6hdr *ipv6h = (struct ipv6hdr*)iph;
+ top_iph->protocol = IPPROTO_IPV6;
+ top_iph->tos = INET_ECN_encapsulate(iph->tos, ipv6_get_dsfield(ipv6h));
+ top_iph->frag_off = 0;
+ }
+#endif
- flags = x->props.flags;
if (flags & XFRM_STATE_NOECN)
IP_ECN_clear(top_iph);
- top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
- 0 : (iph->frag_off & htons(IP_DF));
if (!top_iph->frag_off)
__ip_select_ident(top_iph, dst->child, 0);
@@ -64,7 +83,6 @@ static int xfrm4_tunnel_output(struct xf
top_iph->saddr = x->props.saddr.a4;
top_iph->daddr = x->id.daddr.a4;
- top_iph->protocol = IPPROTO_IPIP;
memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
return 0;
@@ -75,8 +93,16 @@ static int xfrm4_tunnel_input(struct xfr
struct iphdr *iph = skb->nh.iph;
int err = -EINVAL;
- if (iph->protocol != IPPROTO_IPIP)
- goto out;
+ switch(iph->protocol){
+ case IPPROTO_IPIP:
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ case IPPROTO_IPV6:
+ break;
+#endif
+ default:
+ goto out;
+ }
+
if (!pskb_may_pull(skb, sizeof(struct iphdr)))
goto out;
@@ -84,10 +110,19 @@ static int xfrm4_tunnel_input(struct xfr
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
goto out;
- if (x->props.flags & XFRM_STATE_DECAP_DSCP)
- ipv4_copy_dscp(iph, skb->h.ipiph);
- if (!(x->props.flags & XFRM_STATE_NOECN))
- ipip_ecn_decapsulate(skb);
+ if (iph->protocol == IPPROTO_IPIP) {
+ if (x->props.flags & XFRM_STATE_DECAP_DSCP)
+ ipv4_copy_dscp(iph, skb->h.ipiph);
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip_ecn_decapsulate(skb);
+ }
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ else {
+ if (!(x->props.flags & XFRM_STATE_NOECN))
+ ipip6_ecn_decapsulate(iph, skb);
+ skb->protocol = htons(ETH_P_IPV6);
+ }
+#endif
skb->mac.raw = memmove(skb->data - skb->mac_len,
skb->mac.raw, skb->mac_len);
skb->nh.raw = skb->data;
diff --git a/net/ipv6/xfrm6_policy.c b/net/ipv6/xfrm6_policy.c
index 8dffd4d..a7f28bf 100644
--- a/net/ipv6/xfrm6_policy.c
+++ b/net/ipv6/xfrm6_policy.c
@@ -131,16 +131,19 @@ __xfrm6_bundle_create(struct xfrm_policy
struct dst_entry *dst, *dst_prev;
struct rt6_info *rt0 = (struct rt6_info*)(*dst_p);
struct rt6_info *rt = rt0;
- struct in6_addr *remote = &fl->fl6_dst;
- struct in6_addr *local = &fl->fl6_src;
struct flowi fl_tunnel = {
.nl_u = {
.ip6_u = {
- .saddr = *local,
- .daddr = *remote
+ .saddr = fl->fl6_src,
+ .daddr = fl->fl6_dst,
}
}
};
+ union {
+ struct in6_addr *in6;
+ struct in_addr *in;
+ } remote, local;
+ unsigned short encap_family = 0;
int i;
int err = 0;
int header_len = 0;
@@ -153,7 +156,6 @@ __xfrm6_bundle_create(struct xfrm_policy
for (i = 0; i < nx; i++) {
struct dst_entry *dst1 = dst_alloc(&xfrm6_dst_ops);
struct xfrm_dst *xdst;
- int tunnel = 0;
if (unlikely(dst1 == NULL)) {
err = -ENOBUFS;
@@ -178,18 +180,33 @@ __xfrm6_bundle_create(struct xfrm_policy
dst1->next = dst_prev;
dst_prev = dst1;
if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
- remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
- local = __xfrm6_bundle_addr_local(xfrm[i], local);
- tunnel = 1;
+ encap_family = xfrm[i]->props.family;
+ if (encap_family == AF_INET6) {
+ remote.in6 = (struct in6_addr*)&xfrm[i]->id.daddr;
+ local.in6 = (struct in6_addr*)&xfrm[i]->props.saddr;
+ } else if(encap_family == AF_INET){
+ remote.in = (struct in_addr*)&xfrm[i]->id.daddr;
+ local.in = (struct in_addr*)&xfrm[i]->props.saddr;
+ }
}
__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
trailer_len += xfrm[i]->props.trailer_len;
+ if (encap_family) {
+ switch(encap_family) {
+ case AF_INET:
+ fl_tunnel.fl4_dst = remote.in->s_addr;
+ fl_tunnel.fl4_src = local.in->s_addr;
+ break;
+ case AF_INET6:
+ ipv6_addr_copy(&fl_tunnel.fl6_dst, remote.in6);
+ ipv6_addr_copy(&fl_tunnel.fl6_src, local.in6);
+ break;
+ default:
+ BUG_ON(1);
+ }
- if (tunnel) {
- ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
- ipv6_addr_copy(&fl_tunnel.fl6_src, local);
- err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
- &fl_tunnel, AF_INET6);
+ err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
+ &fl_tunnel, encap_family);
if (err)
goto error;
} else
@@ -224,7 +241,10 @@ __xfrm6_bundle_create(struct xfrm_policy
/* Copy neighbour for reachability confirmation */
dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
dst_prev->input = rt->u.dst.input;
- dst_prev->output = xfrm6_output;
+ if (dst_prev->xfrm->props.family == AF_INET6)
+ dst_prev->output = xfrm6_output;
+ else
+ dst_prev->output = xfrm4_output;
/* Sheit... I remember I did this right. Apparently,
* it was magically lost, so this code needs audit */
x->u.rt6.rt6i_flags = rt0->rt6i_flags&(RTCF_BROADCAST|RTCF_MULTICAST|RTCF_LOCAL);
--
1.4.1
-
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