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[IPSEC]: IPv6 over IPv4 IPsec tunnel
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This is the patch to support IPv6 over IPv4 IPsec

Signed-off-by: Miika Komu <miika@iki.fi>
Signed-off-by: Diego Beltrami <Diego.Beltrami@hiit.fi>
Signed-off-by: Kazunori Miyazawa <miyazawa@linux-ipv6.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
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@mkomu
mkomu authored and David S. Miller committed Feb 8, 2007
1 parent cdca726 commit c82f963
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Showing 2 changed files with 77 additions and 26 deletions.
57 changes: 46 additions & 11 deletions net/ipv4/xfrm4_mode_tunnel.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -23,6 +23,12 @@ static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
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
Expand All @@ -36,6 +42,7 @@ static inline void ipip_ecn_decapsulate(struct sk_buff *skb)
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;

Expand All @@ -48,23 +55,34 @@ static int xfrm4_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
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);

top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);

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;
Expand All @@ -75,19 +93,36 @@ static int xfrm4_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
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;

if (skb_cloned(skb) &&
(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;
Expand Down
46 changes: 31 additions & 15 deletions net/ipv6/xfrm6_policy.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -131,13 +131,11 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
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,
}
}
};
Expand All @@ -153,7 +151,6 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
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;
Expand All @@ -177,19 +174,27 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int

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;
}

__xfrm6_bundle_len_inc(&header_len, &nfheader_len, xfrm[i]);
trailer_len += xfrm[i]->props.trailer_len;

if (tunnel) {
ipv6_addr_copy(&fl_tunnel.fl6_dst, remote);
ipv6_addr_copy(&fl_tunnel.fl6_src, local);
if (xfrm[i]->props.mode == XFRM_MODE_TUNNEL) {
unsigned short encap_family = xfrm[i]->props.family;
switch(encap_family) {
case AF_INET:
fl_tunnel.fl4_dst = xfrm[i]->id.daddr.a4;
fl_tunnel.fl4_src = xfrm[i]->props.saddr.a4;
break;
case AF_INET6:
ipv6_addr_copy(&fl_tunnel.fl6_dst, (struct in6_addr*)&xfrm[i]->id.daddr.a6);
ipv6_addr_copy(&fl_tunnel.fl6_src, (struct in6_addr*)&xfrm[i]->props.saddr.a6);
break;
default:
BUG_ON(1);
}

err = xfrm_dst_lookup((struct xfrm_dst **) &rt,
&fl_tunnel, AF_INET6);
&fl_tunnel, encap_family);
if (err)
goto error;
} else
Expand All @@ -208,6 +213,7 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
i = 0;
for (; dst_prev != &rt->u.dst; dst_prev = dst_prev->child) {
struct xfrm_dst *x = (struct xfrm_dst*)dst_prev;
struct xfrm_state_afinfo *afinfo;

dst_prev->xfrm = xfrm[i++];
dst_prev->dev = rt->u.dst.dev;
Expand All @@ -224,7 +230,17 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
/* 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;
/* XXX: When IPv4 is implemented as module and can be unloaded,
* we should manage reference to xfrm4_output in afinfo->output.
* Miyazawa
*/
afinfo = xfrm_state_get_afinfo(dst_prev->xfrm->props.family);
if (!afinfo) {
dst = *dst_p;
goto error;
};
dst_prev->output = afinfo->output;
xfrm_state_put_afinfo(afinfo);
/* 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);
Expand Down

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