[IPSEC]: Separate inner/outer mode processing on output
With inter-family transforms the inner mode differs from the outer
mode. Attempting to handle both sides from the same function means
that it needs to handle both IPv4 and IPv6 which creates duplication
and confusion.
This patch separates the two parts on the output path so that each
function deals with one family only.
In particular, the functions xfrm4_extract_output/xfrm6_extract_output
moves the pertinent fields from the IPv4/IPv6 IP headers into a
neutral format stored in skb->cb. This is then used by the outer mode
output functions to write the outer IP header. In this way the output
function no longer has to know about the inner address family.
Since the extract functions are only called by tunnel modes (the only
modes that can support inter-family transforms), I've also moved the
xfrm*_tunnel_check_size calls into them. This allows the correct ICMP
message to be sent as opposed to now where you might call icmp_send
with an IPv6 packet and vice versa.
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/net/ipv4/xfrm4_mode_beet.c b/net/ipv4/xfrm4_mode_beet.c
index e42e122..94842ad 100644
--- a/net/ipv4/xfrm4_mode_beet.c
+++ b/net/ipv4/xfrm4_mode_beet.c
@@ -43,7 +43,17 @@
ph = (struct ip_beet_phdr *)__skb_pull(skb, sizeof(*iph) - hdrlen);
top_iph = ip_hdr(skb);
- memmove(top_iph, iph, sizeof(*iph));
+
+ top_iph->ihl = 5;
+ top_iph->version = 4;
+
+ top_iph->protocol = XFRM_MODE_SKB_CB(skb)->protocol;
+ top_iph->tos = XFRM_MODE_SKB_CB(skb)->tos;
+
+ top_iph->id = XFRM_MODE_SKB_CB(skb)->id;
+ top_iph->frag_off = XFRM_MODE_SKB_CB(skb)->frag_off;
+ top_iph->ttl = XFRM_MODE_SKB_CB(skb)->ttl;
+
if (unlikely(optlen)) {
BUG_ON(optlen < 0);
@@ -111,7 +121,8 @@
static struct xfrm_mode xfrm4_beet_mode = {
.input = xfrm4_beet_input,
- .output = xfrm4_beet_output,
+ .output2 = xfrm4_beet_output,
+ .output = xfrm4_prepare_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_BEET,
.flags = XFRM_MODE_FLAG_TUNNEL,
diff --git a/net/ipv4/xfrm4_mode_tunnel.c b/net/ipv4/xfrm4_mode_tunnel.c
index 68a9f56..cc8bbb2 100644
--- a/net/ipv4/xfrm4_mode_tunnel.c
+++ b/net/ipv4/xfrm4_mode_tunnel.c
@@ -36,53 +36,37 @@
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;
+ struct iphdr *top_iph;
int flags;
- iph = ip_hdr(skb);
-
skb_set_network_header(skb, -x->props.header_len);
skb->mac_header = skb->network_header +
offsetof(struct iphdr, protocol);
- skb->transport_header = skb->network_header + sizeof(*iph);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
top_iph = ip_hdr(skb);
top_iph->ihl = 5;
top_iph->version = 4;
- flags = x->props.flags;
+ top_iph->protocol = x->inner_mode->afinfo->proto;
/* DS disclosed */
- 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
+ top_iph->tos = INET_ECN_encapsulate(XFRM_MODE_SKB_CB(skb)->tos,
+ XFRM_MODE_SKB_CB(skb)->tos);
+ flags = x->props.flags;
if (flags & XFRM_STATE_NOECN)
IP_ECN_clear(top_iph);
- if (!top_iph->frag_off)
- __ip_select_ident(top_iph, dst->child, 0);
+ top_iph->frag_off = (flags & XFRM_STATE_NOPMTUDISC) ?
+ 0 : XFRM_MODE_SKB_CB(skb)->frag_off;
+ ip_select_ident(top_iph, dst->child, NULL);
top_iph->ttl = dst_metric(dst->child, RTAX_HOPLIMIT);
top_iph->saddr = x->props.saddr.a4;
top_iph->daddr = x->id.daddr.a4;
- skb->protocol = htons(ETH_P_IP);
-
- memset(&(IPCB(skb)->opt), 0, sizeof(struct ip_options));
return 0;
}
@@ -136,7 +120,8 @@
static struct xfrm_mode xfrm4_tunnel_mode = {
.input = xfrm4_tunnel_input,
- .output = xfrm4_tunnel_output,
+ .output2 = xfrm4_tunnel_output,
+ .output = xfrm4_prepare_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TUNNEL,
.flags = XFRM_MODE_FLAG_TUNNEL,
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index c4a7156..13fd113 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -8,11 +8,12 @@
* 2 of the License, or (at your option) any later version.
*/
-#include <linux/compiler.h>
#include <linux/if_ether.h>
#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter_ipv4.h>
+#include <net/dst.h>
#include <net/ip.h>
#include <net/xfrm.h>
#include <net/icmp.h>
@@ -25,8 +26,6 @@
if (IPCB(skb)->flags & IPSKB_XFRM_TUNNEL_SIZE)
goto out;
- IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
-
if (!(ip_hdr(skb)->frag_off & htons(IP_DF)) || skb->local_df)
goto out;
@@ -40,18 +39,38 @@
return ret;
}
-static inline int xfrm4_output_one(struct sk_buff *skb)
+int xfrm4_extract_output(struct xfrm_state *x, struct sk_buff *skb)
{
- struct dst_entry *dst = skb->dst;
- struct xfrm_state *x = dst->xfrm;
- struct iphdr *iph;
int err;
- if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
- err = xfrm4_tunnel_check_size(skb);
- if (err)
- goto error_nolock;
- }
+ err = xfrm4_tunnel_check_size(skb);
+ if (err)
+ return err;
+
+ return xfrm4_extract_header(skb);
+}
+
+int xfrm4_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err;
+
+ err = x->inner_mode->afinfo->extract_output(x, skb);
+ if (err)
+ return err;
+
+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
+ IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
+
+ skb->protocol = htons(ETH_P_IP);
+
+ return x->outer_mode->output2(x, skb);
+}
+EXPORT_SYMBOL(xfrm4_prepare_output);
+
+static inline int xfrm4_output_one(struct sk_buff *skb)
+{
+ struct iphdr *iph;
+ int err;
err = xfrm_output(skb);
if (err)
diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
index 13d54a1..e6030e7 100644
--- a/net/ipv4/xfrm4_state.c
+++ b/net/ipv4/xfrm4_state.c
@@ -47,12 +47,29 @@
x->props.family = AF_INET;
}
+int xfrm4_extract_header(struct sk_buff *skb)
+{
+ struct iphdr *iph = ip_hdr(skb);
+
+ XFRM_MODE_SKB_CB(skb)->id = iph->id;
+ XFRM_MODE_SKB_CB(skb)->frag_off = iph->frag_off;
+ XFRM_MODE_SKB_CB(skb)->tos = iph->tos;
+ XFRM_MODE_SKB_CB(skb)->ttl = iph->ttl;
+ XFRM_MODE_SKB_CB(skb)->protocol = iph->protocol;
+ memset(XFRM_MODE_SKB_CB(skb)->flow_lbl, 0,
+ sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
+
+ return 0;
+}
+
static struct xfrm_state_afinfo xfrm4_state_afinfo = {
.family = AF_INET,
+ .proto = IPPROTO_IPIP,
.owner = THIS_MODULE,
.init_flags = xfrm4_init_flags,
.init_tempsel = __xfrm4_init_tempsel,
.output = xfrm4_output,
+ .extract_output = xfrm4_extract_output,
};
void __init xfrm4_state_init(void)
diff --git a/net/ipv6/xfrm6_mode_beet.c b/net/ipv6/xfrm6_mode_beet.c
index 2bfb4f0..4988ed9 100644
--- a/net/ipv6/xfrm6_mode_beet.c
+++ b/net/ipv6/xfrm6_mode_beet.c
@@ -25,25 +25,24 @@
*/
static int xfrm6_beet_output(struct xfrm_state *x, struct sk_buff *skb)
{
- struct ipv6hdr *iph, *top_iph;
- u8 *prevhdr;
- int hdr_len;
+ struct ipv6hdr *top_iph;
- iph = ipv6_hdr(skb);
-
- hdr_len = ip6_find_1stfragopt(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);
-
+ skb->mac_header = skb->network_header +
+ offsetof(struct ipv6hdr, nexthdr);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
top_iph = ipv6_hdr(skb);
- memmove(top_iph, iph, hdr_len);
+ top_iph->version = 6;
+
+ memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
+ sizeof(top_iph->flow_lbl));
+ top_iph->nexthdr = XFRM_MODE_SKB_CB(skb)->protocol;
+
+ ipv6_change_dsfield(top_iph, 0, XFRM_MODE_SKB_CB(skb)->tos);
+ top_iph->hop_limit = XFRM_MODE_SKB_CB(skb)->ttl;
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;
}
@@ -76,7 +75,8 @@
static struct xfrm_mode xfrm6_beet_mode = {
.input = xfrm6_beet_input,
- .output = xfrm6_beet_output,
+ .output2 = xfrm6_beet_output,
+ .output = xfrm6_prepare_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_BEET,
.flags = XFRM_MODE_FLAG_TUNNEL,
diff --git a/net/ipv6/xfrm6_mode_tunnel.c b/net/ipv6/xfrm6_mode_tunnel.c
index 9a43ea7..d45ce5d 100644
--- a/net/ipv6/xfrm6_mode_tunnel.c
+++ b/net/ipv6/xfrm6_mode_tunnel.c
@@ -38,33 +38,22 @@
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;
+ struct ipv6hdr *top_iph;
int dsfield;
- iph = ipv6_hdr(skb);
-
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(*iph);
+ skb->transport_header = skb->network_header + sizeof(*top_iph);
top_iph = ipv6_hdr(skb);
top_iph->version = 6;
- 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);
+
+ memcpy(top_iph->flow_lbl, XFRM_MODE_SKB_CB(skb)->flow_lbl,
+ sizeof(top_iph->flow_lbl));
+ top_iph->nexthdr = x->inner_mode->afinfo->proto;
+
+ dsfield = XFRM_MODE_SKB_CB(skb)->tos;
dsfield = INET_ECN_encapsulate(dsfield, dsfield);
if (x->props.flags & XFRM_STATE_NOECN)
dsfield &= ~INET_ECN_MASK;
@@ -72,7 +61,6 @@
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);
- skb->protocol = htons(ETH_P_IPV6);
return 0;
}
@@ -116,7 +104,8 @@
static struct xfrm_mode xfrm6_tunnel_mode = {
.input = xfrm6_tunnel_input,
- .output = xfrm6_tunnel_output,
+ .output2 = xfrm6_tunnel_output,
+ .output = xfrm6_prepare_output,
.owner = THIS_MODULE,
.encap = XFRM_MODE_TUNNEL,
.flags = XFRM_MODE_FLAG_TUNNEL,
diff --git a/net/ipv6/xfrm6_output.c b/net/ipv6/xfrm6_output.c
index 6569767..bc2e80e 100644
--- a/net/ipv6/xfrm6_output.c
+++ b/net/ipv6/xfrm6_output.c
@@ -10,10 +10,12 @@
*/
#include <linux/if_ether.h>
-#include <linux/compiler.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/icmpv6.h>
#include <linux/netfilter_ipv6.h>
+#include <net/dst.h>
#include <net/ipv6.h>
#include <net/xfrm.h>
@@ -43,18 +45,37 @@
return ret;
}
-static inline int xfrm6_output_one(struct sk_buff *skb)
+int xfrm6_extract_output(struct xfrm_state *x, struct sk_buff *skb)
{
- struct dst_entry *dst = skb->dst;
- struct xfrm_state *x = dst->xfrm;
- struct ipv6hdr *iph;
int err;
- if (x->outer_mode->flags & XFRM_MODE_FLAG_TUNNEL) {
- err = xfrm6_tunnel_check_size(skb);
- if (err)
- goto error_nolock;
- }
+ err = xfrm6_tunnel_check_size(skb);
+ if (err)
+ return err;
+
+ return xfrm6_extract_header(skb);
+}
+
+int xfrm6_prepare_output(struct xfrm_state *x, struct sk_buff *skb)
+{
+ int err;
+
+ err = x->inner_mode->afinfo->extract_output(x, skb);
+ if (err)
+ return err;
+
+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
+
+ skb->protocol = htons(ETH_P_IPV6);
+
+ return x->outer_mode->output2(x, skb);
+}
+EXPORT_SYMBOL(xfrm6_prepare_output);
+
+static inline int xfrm6_output_one(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph;
+ int err;
err = xfrm_output(skb);
if (err)
diff --git a/net/ipv6/xfrm6_state.c b/net/ipv6/xfrm6_state.c
index b392bee..98b05f4 100644
--- a/net/ipv6/xfrm6_state.c
+++ b/net/ipv6/xfrm6_state.c
@@ -14,6 +14,7 @@
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
+#include <net/dsfield.h>
#include <net/ipv6.h>
#include <net/addrconf.h>
@@ -168,13 +169,30 @@
return 0;
}
+int xfrm6_extract_header(struct sk_buff *skb)
+{
+ struct ipv6hdr *iph = ipv6_hdr(skb);
+
+ XFRM_MODE_SKB_CB(skb)->id = 0;
+ XFRM_MODE_SKB_CB(skb)->frag_off = htons(IP_DF);
+ XFRM_MODE_SKB_CB(skb)->tos = ipv6_get_dsfield(iph);
+ XFRM_MODE_SKB_CB(skb)->ttl = iph->hop_limit;
+ XFRM_MODE_SKB_CB(skb)->protocol = iph->nexthdr;
+ memcpy(XFRM_MODE_SKB_CB(skb)->flow_lbl, iph->flow_lbl,
+ sizeof(XFRM_MODE_SKB_CB(skb)->flow_lbl));
+
+ return 0;
+}
+
static struct xfrm_state_afinfo xfrm6_state_afinfo = {
.family = AF_INET6,
+ .proto = IPPROTO_IPV6,
.owner = THIS_MODULE,
.init_tempsel = __xfrm6_init_tempsel,
.tmpl_sort = __xfrm6_tmpl_sort,
.state_sort = __xfrm6_state_sort,
.output = xfrm6_output,
+ .extract_output = xfrm6_extract_output,
};
void __init xfrm6_state_init(void)