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authorHerbert Xu <herbert@gondor.apana.org.au>2005-06-20 13:21:43 -0700
committerDavid S. Miller <davem@davemloft.net>2005-06-20 13:21:43 -0700
commitdd87147eed934eaff92869f3d158697c7239d1d2 (patch)
tree5a5d59c2678767530c2a3299a70ccfc14062b347
parentd094cd83c06e06e01d8edb540555f3f64e4081c2 (diff)
[IPSEC]: Add XFRM_STATE_NOPMTUDISC flag
This patch adds the flag XFRM_STATE_NOPMTUDISC for xfrm states. It is similar to the nopmtudisc on IPIP/GRE tunnels. It only has an effect on IPv4 tunnel mode states. For these states, it will ensure that the DF flag is always cleared. This is primarily useful to work around ICMP blackholes. In future this flag could also allow a larger MTU to be set within the tunnel just like IPIP/GRE tunnels. This could be useful for short haul tunnels where temporary fragmentation outside the tunnel is desired over smaller fragments inside the tunnel. Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Acked-by: James Morris <jmorris@redhat.com> Signed-off-by: David S. Miller <davem@davemloft.net>
-rw-r--r--include/linux/pfkeyv2.h1
-rw-r--r--include/linux/xfrm.h1
-rw-r--r--net/ipv4/xfrm4_output.c8
-rw-r--r--net/ipv4/xfrm4_state.c9
-rw-r--r--net/key/af_key.c4
5 files changed, 21 insertions, 2 deletions
diff --git a/include/linux/pfkeyv2.h b/include/linux/pfkeyv2.h
index e6b51922024..724066778af 100644
--- a/include/linux/pfkeyv2.h
+++ b/include/linux/pfkeyv2.h
@@ -245,6 +245,7 @@ struct sadb_x_nat_t_port {
/* Security Association flags */
#define SADB_SAFLAGS_PFS 1
+#define SADB_SAFLAGS_NOPMTUDISC 0x20000000
#define SADB_SAFLAGS_DECAP_DSCP 0x40000000
#define SADB_SAFLAGS_NOECN 0x80000000
diff --git a/include/linux/xfrm.h b/include/linux/xfrm.h
index d68391a9b9f..f0d423300d8 100644
--- a/include/linux/xfrm.h
+++ b/include/linux/xfrm.h
@@ -196,6 +196,7 @@ struct xfrm_usersa_info {
__u8 flags;
#define XFRM_STATE_NOECN 1
#define XFRM_STATE_DECAP_DSCP 2
+#define XFRM_STATE_NOPMTUDISC 4
};
struct xfrm_usersa_id {
diff --git a/net/ipv4/xfrm4_output.c b/net/ipv4/xfrm4_output.c
index af2392ae576..66620a95942 100644
--- a/net/ipv4/xfrm4_output.c
+++ b/net/ipv4/xfrm4_output.c
@@ -33,6 +33,7 @@ static void xfrm4_encap(struct sk_buff *skb)
struct dst_entry *dst = skb->dst;
struct xfrm_state *x = dst->xfrm;
struct iphdr *iph, *top_iph;
+ int flags;
iph = skb->nh.iph;
skb->h.ipiph = iph;
@@ -51,10 +52,13 @@ static void xfrm4_encap(struct sk_buff *skb)
/* DS disclosed */
top_iph->tos = INET_ECN_encapsulate(iph->tos, iph->tos);
- if (x->props.flags & XFRM_STATE_NOECN)
+
+ flags = x->props.flags;
+ if (flags & XFRM_STATE_NOECN)
IP_ECN_clear(top_iph);
- top_iph->frag_off = iph->frag_off & htons(IP_DF);
+ 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, 0);
diff --git a/net/ipv4/xfrm4_state.c b/net/ipv4/xfrm4_state.c
index 223a2e83853..050611d7a96 100644
--- a/net/ipv4/xfrm4_state.c
+++ b/net/ipv4/xfrm4_state.c
@@ -7,12 +7,20 @@
*
*/
+#include <net/ip.h>
#include <net/xfrm.h>
#include <linux/pfkeyv2.h>
#include <linux/ipsec.h>
static struct xfrm_state_afinfo xfrm4_state_afinfo;
+static int xfrm4_init_flags(struct xfrm_state *x)
+{
+ if (ipv4_config.no_pmtu_disc)
+ x->props.flags |= XFRM_STATE_NOPMTUDISC;
+ return 0;
+}
+
static void
__xfrm4_init_tempsel(struct xfrm_state *x, struct flowi *fl,
struct xfrm_tmpl *tmpl,
@@ -109,6 +117,7 @@ __xfrm4_find_acq(u8 mode, u32 reqid, u8 proto,
static struct xfrm_state_afinfo xfrm4_state_afinfo = {
.family = AF_INET,
.lock = RW_LOCK_UNLOCKED,
+ .init_flags = xfrm4_init_flags,
.init_tempsel = __xfrm4_init_tempsel,
.state_lookup = __xfrm4_state_lookup,
.find_acq = __xfrm4_find_acq,
diff --git a/net/key/af_key.c b/net/key/af_key.c
index 652dd09ccd3..4879743b945 100644
--- a/net/key/af_key.c
+++ b/net/key/af_key.c
@@ -690,6 +690,8 @@ static struct sk_buff * pfkey_xfrm_state2msg(struct xfrm_state *x, int add_keys,
sa->sadb_sa_flags |= SADB_SAFLAGS_NOECN;
if (x->props.flags & XFRM_STATE_DECAP_DSCP)
sa->sadb_sa_flags |= SADB_SAFLAGS_DECAP_DSCP;
+ if (x->props.flags & XFRM_STATE_NOPMTUDISC)
+ sa->sadb_sa_flags |= SADB_SAFLAGS_NOPMTUDISC;
/* hard time */
if (hsc & 2) {
@@ -974,6 +976,8 @@ static struct xfrm_state * pfkey_msg2xfrm_state(struct sadb_msg *hdr,
x->props.flags |= XFRM_STATE_NOECN;
if (sa->sadb_sa_flags & SADB_SAFLAGS_DECAP_DSCP)
x->props.flags |= XFRM_STATE_DECAP_DSCP;
+ if (sa->sadb_sa_flags & SADB_SAFLAGS_NOPMTUDISC)
+ x->props.flags |= XFRM_STATE_NOPMTUDISC;
lifetime = (struct sadb_lifetime*) ext_hdrs[SADB_EXT_LIFETIME_HARD-1];
if (lifetime != NULL) {