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TEE: make skb writable before attempting checksum update

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This also adds the compat function xtnu_skb_make_writable().
This commit is contained in:
Jan Engelhardt
2008-04-09 20:06:17 +02:00
parent 37e51dc44d
commit f34be8445f
4 changed files with 17 additions and 0 deletions
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12
extensions/compat_xtables.c
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@@ -309,6 +309,18 @@ int xtnu_ip_route_me_harder(struct sk_buff *skb, unsigned int addr_type)
return ret; return ret;
} }
EXPORT_SYMBOL_GPL(xtnu_ip_route_me_harder); EXPORT_SYMBOL_GPL(xtnu_ip_route_me_harder);
int xtnu_skb_make_writable(struct sk_buff *skb, unsigned int len)
{
struct sk_buff *nskb = skb;
int ret;
ret = skb_make_writable(&skb, len);
if (nskb != skb)
return unable(__func__);
return ret;
}
EXPORT_SYMBOL_GPL(xtnu_skb_make_writable);
#endif #endif
#if LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 24) #if LINUX_VERSION_CODE == KERNEL_VERSION(2, 6, 24)

1
extensions/compat_xtables.h
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@@ -59,6 +59,7 @@
#if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 23) #if LINUX_VERSION_CODE <= KERNEL_VERSION(2, 6, 23)
# define xt_target xtnu_target # define xt_target xtnu_target
# define ip_route_me_harder xtnu_ip_route_me_harder # define ip_route_me_harder xtnu_ip_route_me_harder
# define skb_make_writable xtnu_skb_make_writable
# define xt_register_target xtnu_register_target # define xt_register_target xtnu_register_target
# define xt_unregister_target xtnu_unregister_target # define xt_unregister_target xtnu_unregister_target
# define xt_register_targets xtnu_register_targets # define xt_register_targets xtnu_register_targets

1
extensions/compat_xtnu.h
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@@ -69,6 +69,7 @@ static inline struct xtnu_target *xtcompat_nutarget(const struct xt_target *t)
extern int xtnu_ip_local_out(struct sk_buff *); extern int xtnu_ip_local_out(struct sk_buff *);
extern int xtnu_ip_route_me_harder(struct sk_buff *, unsigned int); extern int xtnu_ip_route_me_harder(struct sk_buff *, unsigned int);
extern int xtnu_skb_make_writable(struct sk_buff *, unsigned int);
extern int xtnu_register_match(struct xtnu_match *); extern int xtnu_register_match(struct xtnu_match *);
extern int xtnu_ip_route_output_key(void *, struct rtable **, struct flowi *); extern int xtnu_ip_route_output_key(void *, struct rtable **, struct flowi *);
extern void xtnu_unregister_match(struct xtnu_match *); extern void xtnu_unregister_match(struct xtnu_match *);

3
extensions/xt_TEE.c
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@@ -158,6 +158,9 @@ tee_tg(struct sk_buff *skb, const struct net_device *in,
} }
#endif #endif
if (!skb_make_writable(skb, sizeof(struct iphdr)))
return NF_DROP;
/* /*
* If we are in INPUT, the checksum must be recalculated since * If we are in INPUT, the checksum must be recalculated since
* the length could have changed as a result of defragmentation. * the length could have changed as a result of defragmentation.