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Date: Fri, 7 Mar 2008 19:52:24 +0200
From: Joakim Koskela <joakim.koskela@...t.fi>
To: netdev@...r.kernel.org
Cc: Herbert Xu <herbert@...dor.apana.org.au>
Subject: [RFC PATCH]: Fix output for BEET ipsec
This patch fixes the ipsec BEET (Bound End-to-End Tunnel) mode
interfamily handling of the net-2.6 (25-rc3) kernel, as specified by
the ietf draft found at:
http://www.ietf.org/internet-drafts/draft-nikander-esp-beet-mode-08.txt
It is sent as a RFC as it doesn't fit that neatly into the newly
cleaned-up xfrm model - I suspect that there could be a better way to
solve this.
Signed-off-by: Joakim Koskela <jookos@...il.com>
---
net/ipv4/esp4.c | 10 +++-
net/ipv4/xfrm4_mode_beet.c | 104 +++++++++++++++++++++++++++++---------------
net/ipv6/esp6.c | 6 +++
net/ipv6/xfrm6_mode_beet.c | 83 ++++++++++++++++++++++++++++++-----
4 files changed, 153 insertions(+), 50 deletions(-)
diff --git a/net/ipv4/esp4.c b/net/ipv4/esp4.c
index 091e670..20d214f 100644
--- a/net/ipv4/esp4.c
+++ b/net/ipv4/esp4.c
@@ -404,7 +404,8 @@ static u32 esp4_get_mtu(struct xfrm_state *x, int mtu)
break;
case XFRM_MODE_BEET:
/* The worst case. */
- mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem);
+ /* These will be see to in the esp header_len */
+ /* mtu += min_t(u32, IPV4_BEET_PHMAXLEN, rem); */
break;
}
@@ -575,8 +576,11 @@ static int esp_init_state(struct xfrm_state *x)
crypto_aead_ivsize(aead);
if (x->props.mode == XFRM_MODE_TUNNEL)
x->props.header_len += sizeof(struct iphdr);
- else if (x->props.mode == XFRM_MODE_BEET)
- x->props.header_len += IPV4_BEET_PHMAXLEN;
+ else if (x->props.mode == XFRM_MODE_BEET) {
+ if (x->sel.family == AF_INET) {
+ x->props.header_len += IPV4_BEET_PHMAXLEN;
+ }
+ }
if (x->encap) {
struct xfrm_encap_tmpl *encap = x->encap;
diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index b47030b..83db9b2 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -6,6 +6,7 @@
* Herbert Xu <herbert@...dor.apana.org.au>
* Abhinav Pathak <abhinav.pathak@...t.fi>
* Jeff Ahrenholz <ahrenholz@...il.com>
+ * Joakim Koskela <jookos@...il.com>
*/
#include <linux/init.h>
@@ -38,45 +39,78 @@ static void xfrm4_beet_make_header(struct sk_buff *skb)
*/
static int xfrm4_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
- struct ip_beet_phdr *ph;
struct iphdr *iph, *top_iph;
- int hdrlen, optlen;
iph = ip_hdr(skb);
-
- hdrlen = 0;
- optlen = iph->ihl * 4 - sizeof(*iph);
- if (unlikely(optlen))
- hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
-
- skb_set_network_header(skb, IPV4_BEET_PHMAXLEN - x->props.header_len -
- hdrlen);
- skb->mac_header = skb->network_header +
- offsetof(struct iphdr, protocol);
- skb->transport_header = skb->network_header + sizeof(*iph);
-
- xfrm4_beet_make_header(skb);
-
- ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
-
- top_iph = ip_hdr(skb);
-
- if (unlikely(optlen)) {
- BUG_ON(optlen < 0);
-
- ph->padlen = 4 - (optlen & 4);
- ph->hdrlen = optlen / 8;
- ph->nexthdr = top_iph->protocol;
- if (ph->padlen)
- memset(ph + 1, IPOPT_NOP, ph->padlen);
-
- top_iph->protocol = IPPROTO_BEETPH;
- top_iph->ihl = sizeof(struct iphdr) / 4;
+ if (iph->version == 4) {
+ struct ip_beet_phdr *ph;
+ int hdrlen, optlen;
+
+ hdrlen = 0;
+ optlen = iph->ihl * 4 - sizeof(*iph);
+ if (unlikely(optlen))
+ hdrlen += IPV4_BEET_PHMAXLEN - (optlen & 4);
+
+ skb_set_network_header(skb, IPV4_BEET_PHMAXLEN - x->props.header_len -
+ hdrlen);
+ skb->mac_header = skb->network_header +
+ offsetof(struct iphdr, protocol);
+ skb->transport_header = skb->network_header + sizeof(*iph);
+
+ xfrm4_beet_make_header(skb);
+
+ ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
+
+ top_iph = ip_hdr(skb);
+
+ if (unlikely(optlen)) {
+ BUG_ON(optlen < 0);
+
+ ph->padlen = 4 - (optlen & 4);
+ ph->hdrlen = optlen / 8;
+ ph->nexthdr = top_iph->protocol;
+ if (ph->padlen)
+ memset(ph + 1, IPOPT_NOP, ph->padlen);
+
+ top_iph->protocol = IPPROTO_BEETPH;
+ top_iph->ihl = sizeof(struct iphdr) / 4;
+ }
+
+ top_iph->saddr = x->props.saddr.a4;
+ top_iph->daddr = x->id.daddr.a4;
+
+#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
+ } else if (iph->version == 6) {
+ struct dst_entry *dst = skb->dst;
+
+ int delta = sizeof(struct ipv6hdr) - sizeof(struct iphdr);
+ u8 protocol = ipv6_hdr(skb)->nexthdr;
+
+ /* Inner = 6, Outer = 4 : changing the external IP hdr
+ * to the outer addresses
+ */
+ skb_set_network_header(skb, delta - x->props.header_len);
+ skb->transport_header = skb->network_header + sizeof(*iph);
+ skb->mac_header = skb->network_header +
+ offsetof(struct iphdr, protocol);
+ skb_pull(skb, sizeof(struct ipv6hdr));
+
+ top_iph = ip_hdr(skb);
+ top_iph->ihl = 5;
+ top_iph->version = 4;
+ top_iph->id = 0;
+ top_iph->frag_off = htons(IP_DF);
+ top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
+ top_iph->protocol = protocol;
+
+ top_iph->saddr = x->props.saddr.a4;
+ top_iph->daddr = x->id.daddr.a4;
+ IPCB(skb)->flags = 0;
+
+ skb->protocol = htons(ETH_P_IP);
+ memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
+#endif
}
-
- top_iph->saddr = x->props.saddr.a4;
- top_iph->daddr = x->id.daddr.a4;
-
return 0;
}
diff --git a/net/ipv6/esp6.c b/net/ipv6/esp6.c
index 0ec1402..984a03e 100644
--- a/net/ipv6/esp6.c
+++ b/net/ipv6/esp6.c
@@ -344,6 +344,7 @@ static u32 esp6_get_mtu(struct xfrm_state *x, int mtu)
rem = mtu & (align - 1);
mtu &= ~(align - 1);
+ /* hm, is this right? maybe we shouldn't do this for beet either? */
if (x->props.mode != XFRM_MODE_TUNNEL) {
u32 padsize = ((blksize - 1) & 7) + 1;
mtu -= blksize - padsize;
@@ -521,6 +522,11 @@ static int esp6_init_state(struct xfrm_state *x)
crypto_aead_ivsize(aead);
switch (x->props.mode) {
case XFRM_MODE_BEET:
+ if (x->sel.family == AF_INET) {
+ x->props.header_len += IPV4_BEET_PHMAXLEN +
+ (sizeof(struct ipv6hdr) - sizeof(struct iphdr));
+ }
+ break;
case XFRM_MODE_TRANSPORT:
break;
case XFRM_MODE_TUNNEL:
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c
index 0527d11..2547c51 100644
--- a/net/ipv6/xfrm6_mode_beet.c
+++ b/net/ipv6/xfrm6_mode_beet.c
@@ -6,6 +6,7 @@
* Herbert Xu <herbert@...dor.apana.org.au>
* Abhinav Pathak <abhinav.pathak@...t.fi>
* Jeff Ahrenholz <ahrenholz@...il.com>
+ * Joakim Koskela <jookos@...il.com>
*/
#include <linux/init.h>
@@ -40,18 +41,76 @@ static void xfrm6_beet_make_header(struct sk_buff *skb)
static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
struct ipv6hdr *top_iph;
-
- skb_set_network_header(skb, -x->props.header_len);
- skb->mac_header = skb->network_header +
- offsetof(struct ipv6hdr, nexthdr);
- skb->transport_header = skb->network_header + sizeof(*top_iph);
-
- xfrm6_beet_make_header(skb);
-
- top_iph = ipv6_hdr(skb);
-
- ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
- ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
+ int hdr_len;
+
+ if (ip_hdr(skb)->version == 6) {
+ u8 *prevhdr;
+
+ hdr_len = x->type->hdr_offset(x, skb, &prevhdr);
+ skb_set_mac_header(skb, (prevhdr - x->props.header_len) - skb->data);
+ skb_set_network_header(skb, -x->props.header_len);
+ skb->transport_header = skb->network_header + hdr_len;
+ __skb_pull(skb, hdr_len);
+
+ xfrm6_beet_make_header(skb);
+
+ top_iph = ipv6_hdr(skb);
+
+ ipv6_addr_copy(&top_iph->saddr, (struct in6_addr *)&x->props.saddr);
+ ipv6_addr_copy(&top_iph->daddr, (struct in6_addr *)&x->id.daddr);
+ } else {
+ struct dst_entry *dst = skb->dst;
+ struct iphdr *iphv4;
+ int flags, optlen, dsfield;
+ struct ip_beet_phdr *ph;
+ u8 protocol;
+
+ iphv4 = ip_hdr(skb);
+ hdr_len = 0;
+ optlen = iphv4->ihl * 4 - sizeof(*iphv4);
+ if (unlikely(optlen))
+ hdr_len += IPV4_BEET_PHMAXLEN - (optlen & 4);
+
+ skb_set_network_header(skb, IPV4_BEET_PHMAXLEN - x->props.header_len -
+ hdr_len);
+ skb->mac_header = skb->network_header + offsetof(struct ipv6hdr, nexthdr);
+ skb->transport_header = skb->network_header + sizeof(struct ipv6hdr);
+
+ ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iphv4) - hdr_len);
+ if (unlikely(optlen)) {
+
+ BUG_ON(optlen < 0);
+
+ ph->padlen = 4 - (optlen & 4);
+ ph->hdrlen = optlen / 8;
+ ph->nexthdr = iphv4->protocol;
+ if (ph->padlen)
+ memset(ph + 1, IPOPT_NOP, ph->padlen);
+
+ protocol = IPPROTO_BEETPH;
+ } else
+ protocol = iphv4->protocol;
+
+ top_iph = ipv6_hdr(skb);
+
+ /* DS disclosed */
+ top_iph->version = 6;
+ top_iph->priority = 0;
+ top_iph->flow_lbl[0] = 0;
+ top_iph->flow_lbl[1] = 0;
+ top_iph->flow_lbl[2] = 0;
+ dsfield = ipv6_get_dsfield(top_iph);
+ dsfield = INET_ECN_encapsulate(dsfield, dsfield);
+ flags = x->props.flags;
+ if (flags & XFRM_STATE_NOECN)
+ dsfield &= ~INET_ECN_MASK;
+ ipv6_change_dsfield(top_iph, 0, dsfield);
+
+ top_iph->nexthdr = protocol;
+ 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);
+ }
return 0;
}
--
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