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[IPSEC]: IPv4 over IPv6 IPsec tunnel
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This is the patch to support IPv4 over IPv6 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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Miika Komu authored and David S. Miller committed Feb 8, 2007
1 parent c82f963 commit 4337226
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Showing 2 changed files with 65 additions and 27 deletions.
50 changes: 33 additions & 17 deletions net/ipv4/xfrm4_policy.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -72,13 +72,11 @@ __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
struct dst_entry *dst, *dst_prev;
struct rtable *rt0 = (struct rtable*)(*dst_p);
struct rtable *rt = rt0;
__be32 remote = fl->fl4_dst;
__be32 local = fl->fl4_src;
struct flowi fl_tunnel = {
.nl_u = {
.ip4_u = {
.saddr = local,
.daddr = remote,
.saddr = fl->fl4_src,
.daddr = fl->fl4_dst,
.tos = fl->fl4_tos
}
}
Expand All @@ -94,7 +92,6 @@ __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
for (i = 0; i < nx; i++) {
struct dst_entry *dst1 = dst_alloc(&xfrm4_dst_ops);
struct xfrm_dst *xdst;
int tunnel = 0;

if (unlikely(dst1 == NULL)) {
err = -ENOBUFS;
Expand All @@ -116,19 +113,28 @@ __xfrm4_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 = xfrm[i]->id.daddr.a4;
local = xfrm[i]->props.saddr.a4;
tunnel = 1;
}

header_len += xfrm[i]->props.header_len;
trailer_len += xfrm[i]->props.trailer_len;

if (tunnel) {
fl_tunnel.fl4_src = local;
fl_tunnel.fl4_dst = remote;
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;
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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;
#endif
default:
BUG_ON(1);
}
err = xfrm_dst_lookup((struct xfrm_dst **)&rt,
&fl_tunnel, AF_INET);
&fl_tunnel, encap_family);
if (err)
goto error;
} else
Expand All @@ -145,6 +151,7 @@ __xfrm4_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;
x->u.rt.fl = *fl;

dst_prev->xfrm = xfrm[i++];
Expand All @@ -162,8 +169,17 @@ __xfrm4_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
/* Copy neighbout for reachability confirmation */
dst_prev->neighbour = neigh_clone(rt->u.dst.neighbour);
dst_prev->input = rt->u.dst.input;
dst_prev->output = xfrm4_output;
if (rt->peer)
/* XXX: When IPv6 module can be unloaded, we should manage reference
* to xfrm6_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);
if (dst_prev->xfrm->props.family == AF_INET && rt->peer)
atomic_inc(&rt->peer->refcnt);
x->u.rt.peer = rt->peer;
/* Sheit... I remember I did this right. Apparently,
Expand Down Expand Up @@ -274,7 +290,7 @@ static void xfrm4_dst_destroy(struct dst_entry *dst)

if (likely(xdst->u.rt.idev))
in_dev_put(xdst->u.rt.idev);
if (likely(xdst->u.rt.peer))
if (dst->xfrm->props.family == AF_INET && likely(xdst->u.rt.peer))
inet_putpeer(xdst->u.rt.peer);
xfrm_dst_destroy(xdst);
}
Expand Down
42 changes: 32 additions & 10 deletions net/ipv6/xfrm6_mode_tunnel.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -25,6 +25,12 @@ static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
IP6_ECN_set_ce(inner_iph);
}

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);
}

/* Add encapsulation header.
*
* The top IP header will be constructed per RFC 2401. The following fields
Expand All @@ -40,6 +46,7 @@ static inline void ipip6_ecn_decapsulate(struct sk_buff *skb)
static int xfrm6_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 ipv6hdr *iph, *top_iph;
int dsfield;

Expand All @@ -52,16 +59,24 @@ static int xfrm6_tunnel_output(struct xfrm_state *x, struct sk_buff *skb)
skb->h.ipv6h = top_iph + 1;

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 (xdst->route->ops->family == AF_INET6) {
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;
} else {
top_iph->priority = 0;
top_iph->flow_lbl[0] = 0;
top_iph->flow_lbl[1] = 0;
top_iph->flow_lbl[2] = 0;
top_iph->nexthdr = IPPROTO_IPIP;
}
dsfield = ipv6_get_dsfield(top_iph);
dsfield = INET_ECN_encapsulate(dsfield, dsfield);
if (x->props.flags & XFRM_STATE_NOECN)
dsfield &= ~INET_ECN_MASK;
ipv6_change_dsfield(top_iph, 0, dsfield);
top_iph->nexthdr = IPPROTO_IPV6;
top_iph->hop_limit = dst_metric(dst->child, RTAX_HOPLIMIT);
ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
Expand All @@ -72,7 +87,8 @@ static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
{
int err = -EINVAL;

if (skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPV6)
if (skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPV6
&& skb->nh.raw[IP6CB(skb)->nhoff] != IPPROTO_IPIP)
goto out;
if (!pskb_may_pull(skb, sizeof(struct ipv6hdr)))
goto out;
Expand All @@ -81,10 +97,16 @@ static int xfrm6_tunnel_input(struct xfrm_state *x, struct sk_buff *skb)
(err = pskb_expand_head(skb, 0, 0, GFP_ATOMIC)))
goto out;

if (x->props.flags & XFRM_STATE_DECAP_DSCP)
ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
if (!(x->props.flags & XFRM_STATE_NOECN))
ipip6_ecn_decapsulate(skb);
if (skb->nh.raw[IP6CB(skb)->nhoff] == IPPROTO_IPV6) {
if (x->props.flags & XFRM_STATE_DECAP_DSCP)
ipv6_copy_dscp(skb->nh.ipv6h, skb->h.ipv6h);
if (!(x->props.flags & XFRM_STATE_NOECN))
ipip6_ecn_decapsulate(skb);
} else {
if (!(x->props.flags & XFRM_STATE_NOECN))
ip6ip_ecn_decapsulate(skb);
skb->protocol = htons(ETH_P_IP);
}
skb->mac.raw = memmove(skb->data - skb->mac_len,
skb->mac.raw, skb->mac_len);
skb->nh.raw = skb->data;
Expand Down

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