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[XFRM]: Optimize MTU calculation

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Replace the probing based MTU estimation, which usually takes 2-3 iterations
to find a fitting value and may underestimate the MTU, by an exact calculation.

Also fix underestimation of the XFRM trailer_len, which causes unnecessary
reallocations.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Patrick McHardy
2007-04-09 11:47:18 -07:00
committed by David S. Miller
parent 557922584d
commit c5c2523893
4 changed files with 39 additions and 51 deletions
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include/net/xfrm.h
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@@ -279,7 +279,7 @@ struct xfrm_type
xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
/* Estimate maximal size of result of transformation of a dgram */
u32 (*get_max_size)(struct xfrm_state *, int size);
u32 (*get_mtu)(struct xfrm_state *, int size);
};
extern int xfrm_register_type(struct xfrm_type *type, unsigned short family);