[XFRM] STATE: Add a hook to obtain local/remote outbound address.
Outbound transformation replaces both source and destination address with state's end-point addresses at the same time when IPsec tunnel mode. It is also required to change them for Mobile IPv6 route optimization, but we should care about the following differences: - changing result is not end-point but care-of address - either source or destination is replaced for each state This hook is a common platform to change outbound address. Based on MIPL2 kernel patch. Signed-off-by: Masahide NAKAMURA <nakam@linux-ipv6.org> Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org> Signed-off-by: David S. Miller <davem@davemloft.net>
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9e51fd371a
Коммит
99505a8436
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@ -266,6 +266,8 @@ struct xfrm_type
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int (*input)(struct xfrm_state *, struct sk_buff *skb);
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int (*output)(struct xfrm_state *, struct sk_buff *pskb);
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int (*hdr_offset)(struct xfrm_state *, struct sk_buff *, u8 **);
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xfrm_address_t *(*local_addr)(struct xfrm_state *, xfrm_address_t *);
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xfrm_address_t *(*remote_addr)(struct xfrm_state *, xfrm_address_t *);
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/* Estimate maximal size of result of transformation of a dgram */
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u32 (*get_max_size)(struct xfrm_state *, int size);
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};
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@ -59,6 +59,22 @@ __xfrm6_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
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return dst;
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}
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static inline struct in6_addr*
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__xfrm6_bundle_addr_remote(struct xfrm_state *x, struct in6_addr *addr)
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{
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return (x->type->remote_addr) ?
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(struct in6_addr*)x->type->remote_addr(x, (xfrm_address_t *)addr) :
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(struct in6_addr*)&x->id.daddr;
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}
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static inline struct in6_addr*
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__xfrm6_bundle_addr_local(struct xfrm_state *x, struct in6_addr *addr)
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{
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return (x->type->local_addr) ?
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(struct in6_addr*)x->type->local_addr(x, (xfrm_address_t *)addr) :
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(struct in6_addr*)&x->props.saddr;
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}
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/* Allocate chain of dst_entry's, attach known xfrm's, calculate
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* all the metrics... Shortly, bundle a bundle.
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*/
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@ -115,8 +131,8 @@ __xfrm6_bundle_create(struct xfrm_policy *policy, struct xfrm_state **xfrm, int
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dst1->next = dst_prev;
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dst_prev = dst1;
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if (xfrm[i]->props.mode != XFRM_MODE_TRANSPORT) {
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remote = (struct in6_addr*)&xfrm[i]->id.daddr;
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local = (struct in6_addr*)&xfrm[i]->props.saddr;
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remote = __xfrm6_bundle_addr_remote(xfrm[i], remote);
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local = __xfrm6_bundle_addr_local(xfrm[i], local);
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tunnel = 1;
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}
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header_len += xfrm[i]->props.header_len;
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