Commit 63c43787 authored by Nicolas Dichtel's avatar Nicolas Dichtel Committed by Steffen Klassert
Browse files

vti6: fix input path 



Since commit 1625f452, vti6 is broken, all input packets are dropped
(LINUX_MIB_XFRMINNOSTATES is incremented).

XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 is set by vti6_rcv() before calling
xfrm6_rcv()/xfrm6_rcv_spi(), thus we cannot set to NULL that value in
xfrm6_rcv_spi().

A new function xfrm6_rcv_tnl() that enables to pass a value to
xfrm6_rcv_spi() is added, so that xfrm6_rcv() is not touched (this function
is used in several handlers).

CC: Alexey Kodanev <alexey.kodanev@oracle.com>
Fixes: 1625f452 ("net/xfrm_input: fix possible NULL deref of tunnel.ip6->parms.i_key")
Signed-off-by: default avatarNicolas Dichtel <nicolas.dichtel@6wind.com>
Signed-off-by: default avatarSteffen Klassert <steffen.klassert@secunet.com>
parent b5884793

include/net/xfrm.h

+3 −1
Original line number Diff line number Diff line
@@ -1540,8 +1540,10 @@ int xfrm4_tunnel_deregister(struct xfrm_tunnel *handler, unsigned short family); 
void xfrm4_local_error(struct sk_buff *skb, u32 mtu);

int xfrm6_extract_header(struct sk_buff *skb);

int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb);

int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi);

int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,

		  struct ip6_tnl *t);

int xfrm6_transport_finish(struct sk_buff *skb, int async);

int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t);

int xfrm6_rcv(struct sk_buff *skb);

int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,

		     xfrm_address_t *saddr, u8 proto);

net/ipv6/ip6_vti.c

+1 −3
Original line number Diff line number Diff line
@@ -321,11 +321,9 @@ static int vti6_rcv(struct sk_buff *skb) 
			goto discard;

		}



		XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;



		rcu_read_unlock();



		return xfrm6_rcv(skb);

		return xfrm6_rcv_tnl(skb, t);

	}

	rcu_read_unlock();

	return -EINVAL;

net/ipv6/xfrm6_input.c

+11 −5
Original line number Diff line number Diff line
@@ -21,9 +21,10 @@ int xfrm6_extract_input(struct xfrm_state *x, struct sk_buff *skb) 
	return xfrm6_extract_header(skb);

}



int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi)

int xfrm6_rcv_spi(struct sk_buff *skb, int nexthdr, __be32 spi,

		  struct ip6_tnl *t)

{

	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = NULL;

	XFRM_TUNNEL_SKB_CB(skb)->tunnel.ip6 = t;

	XFRM_SPI_SKB_CB(skb)->family = AF_INET6;

	XFRM_SPI_SKB_CB(skb)->daddroff = offsetof(struct ipv6hdr, daddr);

	return xfrm_input(skb, nexthdr, spi, 0);
@@ -49,13 +50,18 @@ int xfrm6_transport_finish(struct sk_buff *skb, int async) 
	return -1;

}



int xfrm6_rcv(struct sk_buff *skb)

int xfrm6_rcv_tnl(struct sk_buff *skb, struct ip6_tnl *t)

{

	return xfrm6_rcv_spi(skb, skb_network_header(skb)[IP6CB(skb)->nhoff],

			     0);

			     0, t);

}

EXPORT_SYMBOL(xfrm6_rcv);

EXPORT_SYMBOL(xfrm6_rcv_tnl);



int xfrm6_rcv(struct sk_buff *skb)

{

	return xfrm6_rcv_tnl(skb, NULL);

}

EXPORT_SYMBOL(xfrm6_rcv);

int xfrm6_input_addr(struct sk_buff *skb, xfrm_address_t *daddr,

		     xfrm_address_t *saddr, u8 proto)

{

net/ipv6/xfrm6_tunnel.c

+1 −1
Original line number Diff line number Diff line
@@ -236,7 +236,7 @@ static int xfrm6_tunnel_rcv(struct sk_buff *skb) 
	__be32 spi;



	spi = xfrm6_tunnel_spi_lookup(net, (const xfrm_address_t *)&iph->saddr);

	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi);

	return xfrm6_rcv_spi(skb, IPPROTO_IPV6, spi, NULL);

}



static int xfrm6_tunnel_err(struct sk_buff *skb, struct inet6_skb_parm *opt,

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