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134 lines
3.6 KiB
134 lines
3.6 KiB
10 years ago
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commit 5596732fa8c14139018ecda8356eabbfb599d830
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Author: Steffen Klassert <steffen.klassert@secunet.com>
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Date: Mon Apr 7 08:08:52 2014 +0200
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xfrm: Fix crash with ipv6 IPsec tunnel and NAT.
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The ipv6 xfrm output path is not aware that packets can be
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rerouted by NAT to not use IPsec. We crash in this case
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because we expect to have a xfrm state at the dst_entry.
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This crash happens if the ipv6 layer does IPsec and NAT
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or if we have an interfamily IPsec tunnel with ipv4 NAT.
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We fix this by checking for a NAT rerouted packet in each
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address family and dst_output() to the new destination
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in this case.
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Reported-by: Martin Pelikan <martin.pelikan@gmail.com>
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Tested-by: Martin Pelikan <martin.pelikan@gmail.com>
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Signed-off-by: Steffen Klassert <steffen.klassert@secunet.com>
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--- a/net/ipv4/xfrm4_output.c
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+++ b/net/ipv4/xfrm4_output.c
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@@ -62,10 +62,7 @@ int xfrm4_prepare_output(struct xfrm_sta
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if (err)
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return err;
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- memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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- IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE | IPSKB_XFRM_TRANSFORMED;
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-
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- skb->protocol = htons(ETH_P_IP);
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+ IPCB(skb)->flags |= IPSKB_XFRM_TUNNEL_SIZE;
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return x->outer_mode->output2(x, skb);
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}
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@@ -73,27 +70,34 @@ EXPORT_SYMBOL(xfrm4_prepare_output);
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int xfrm4_output_finish(struct sk_buff *skb)
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{
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+ memset(IPCB(skb), 0, sizeof(*IPCB(skb)));
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+ skb->protocol = htons(ETH_P_IP);
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+
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+#ifdef CONFIG_NETFILTER
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+ IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
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+#endif
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+
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+ return xfrm_output(skb);
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+}
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+
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+static int __xfrm4_output(struct sk_buff *skb)
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+{
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+ struct xfrm_state *x = skb_dst(skb)->xfrm;
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+
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#ifdef CONFIG_NETFILTER
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- if (!skb_dst(skb)->xfrm) {
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+ if (!x) {
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IPCB(skb)->flags |= IPSKB_REROUTED;
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return dst_output(skb);
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}
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-
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- IPCB(skb)->flags |= IPSKB_XFRM_TRANSFORMED;
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#endif
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- skb->protocol = htons(ETH_P_IP);
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- return xfrm_output(skb);
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+ return x->outer_mode->afinfo->output_finish(skb);
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}
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int xfrm4_output(struct sk_buff *skb)
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{
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- struct dst_entry *dst = skb_dst(skb);
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- struct xfrm_state *x = dst->xfrm;
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-
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return NF_HOOK_COND(NFPROTO_IPV4, NF_INET_POST_ROUTING, skb,
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- NULL, dst->dev,
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- x->outer_mode->afinfo->output_finish,
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+ NULL, skb_dst(skb)->dev, __xfrm4_output,
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!(IPCB(skb)->flags & IPSKB_REROUTED));
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}
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--- a/net/ipv6/xfrm6_output.c
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+++ b/net/ipv6/xfrm6_output.c
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@@ -114,12 +114,6 @@ int xfrm6_prepare_output(struct xfrm_sta
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if (err)
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return err;
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- memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
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-#ifdef CONFIG_NETFILTER
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- IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
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-#endif
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-
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- skb->protocol = htons(ETH_P_IPV6);
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skb->local_df = 1;
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return x->outer_mode->output2(x, skb);
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@@ -128,11 +122,13 @@ EXPORT_SYMBOL(xfrm6_prepare_output);
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int xfrm6_output_finish(struct sk_buff *skb)
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{
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+ memset(IP6CB(skb), 0, sizeof(*IP6CB(skb)));
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+ skb->protocol = htons(ETH_P_IPV6);
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+
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#ifdef CONFIG_NETFILTER
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IP6CB(skb)->flags |= IP6SKB_XFRM_TRANSFORMED;
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#endif
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- skb->protocol = htons(ETH_P_IPV6);
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return xfrm_output(skb);
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}
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@@ -142,6 +138,13 @@ static int __xfrm6_output(struct sk_buff
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struct xfrm_state *x = dst->xfrm;
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int mtu;
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+#ifdef CONFIG_NETFILTER
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+ if (!x) {
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+ IP6CB(skb)->flags |= IP6SKB_REROUTED;
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+ return dst_output(skb);
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+ }
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+#endif
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+
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if (skb->protocol == htons(ETH_P_IPV6))
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mtu = ip6_skb_dst_mtu(skb);
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else
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@@ -165,6 +168,7 @@ static int __xfrm6_output(struct sk_buff
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int xfrm6_output(struct sk_buff *skb)
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{
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- return NF_HOOK(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb, NULL,
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- skb_dst(skb)->dev, __xfrm6_output);
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+ return NF_HOOK_COND(NFPROTO_IPV6, NF_INET_POST_ROUTING, skb,
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+ NULL, skb_dst(skb)->dev, __xfrm6_output,
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+ !(IP6CB(skb)->flags & IP6SKB_REROUTED));
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}
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