2 * xfrm6_policy.c: based on xfrm4_policy.c
6 * Kazunori MIYAZAWA @USAGI
7 * Kunihiro Ishiguro <kunihiro@ipinfusion.com>
10 * Split up af-specific portion
14 #include <linux/compiler.h>
15 #include <linux/netdevice.h>
16 #include <net/addrconf.h>
20 #include <net/ip6_route.h>
22 static struct dst_ops xfrm6_dst_ops
;
23 static struct xfrm_policy_afinfo xfrm6_policy_afinfo
;
25 static int xfrm6_dst_lookup(struct xfrm_dst
**dst
, struct flowi
*fl
)
28 *dst
= (struct xfrm_dst
*)ip6_route_output(NULL
, fl
);
34 static struct dst_entry
*
35 __xfrm6_find_bundle(struct flowi
*fl
, struct xfrm_policy
*policy
)
37 struct dst_entry
*dst
;
39 /* Still not clear if we should set fl->fl6_{src,dst}... */
40 read_lock_bh(&policy
->lock
);
41 for (dst
= policy
->bundles
; dst
; dst
= dst
->next
) {
42 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
43 struct in6_addr fl_dst_prefix
, fl_src_prefix
;
45 ipv6_addr_prefix(&fl_dst_prefix
,
47 xdst
->u
.rt6
.rt6i_dst
.plen
);
48 ipv6_addr_prefix(&fl_src_prefix
,
50 xdst
->u
.rt6
.rt6i_src
.plen
);
51 if (ipv6_addr_equal(&xdst
->u
.rt6
.rt6i_dst
.addr
, &fl_dst_prefix
) &&
52 ipv6_addr_equal(&xdst
->u
.rt6
.rt6i_src
.addr
, &fl_src_prefix
) &&
53 xfrm_bundle_ok(xdst
, fl
, AF_INET6
)) {
58 read_unlock_bh(&policy
->lock
);
62 static inline struct in6_addr
*
63 __xfrm6_bundle_addr_remote(struct xfrm_state
*x
, struct in6_addr
*addr
)
65 return (x
->type
->remote_addr
) ?
66 (struct in6_addr
*)x
->type
->remote_addr(x
, (xfrm_address_t
*)addr
) :
67 (struct in6_addr
*)&x
->id
.daddr
;
70 static inline struct in6_addr
*
71 __xfrm6_bundle_addr_local(struct xfrm_state
*x
, struct in6_addr
*addr
)
73 return (x
->type
->local_addr
) ?
74 (struct in6_addr
*)x
->type
->local_addr(x
, (xfrm_address_t
*)addr
) :
75 (struct in6_addr
*)&x
->props
.saddr
;
78 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
79 * all the metrics... Shortly, bundle a bundle.
83 __xfrm6_bundle_create(struct xfrm_policy
*policy
, struct xfrm_state
**xfrm
, int nx
,
84 struct flowi
*fl
, struct dst_entry
**dst_p
)
86 struct dst_entry
*dst
, *dst_prev
;
87 struct rt6_info
*rt0
= (struct rt6_info
*)(*dst_p
);
88 struct rt6_info
*rt
= rt0
;
89 struct in6_addr
*remote
= &fl
->fl6_dst
;
90 struct in6_addr
*local
= &fl
->fl6_src
;
91 struct flowi fl_tunnel
= {
104 dst
= dst_prev
= NULL
;
105 dst_hold(&rt
->u
.dst
);
107 for (i
= 0; i
< nx
; i
++) {
108 struct dst_entry
*dst1
= dst_alloc(&xfrm6_dst_ops
);
109 struct xfrm_dst
*xdst
;
112 if (unlikely(dst1
== NULL
)) {
114 dst_release(&rt
->u
.dst
);
121 dst_prev
->child
= dst1
;
122 dst1
->flags
|= DST_NOHASH
;
126 xdst
= (struct xfrm_dst
*)dst1
;
127 xdst
->route
= &rt
->u
.dst
;
129 xdst
->route_cookie
= rt
->rt6i_node
->fn_sernum
;
131 dst1
->next
= dst_prev
;
133 if (xfrm
[i
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
134 remote
= __xfrm6_bundle_addr_remote(xfrm
[i
], remote
);
135 local
= __xfrm6_bundle_addr_local(xfrm
[i
], local
);
138 header_len
+= xfrm
[i
]->props
.header_len
;
139 trailer_len
+= xfrm
[i
]->props
.trailer_len
;
142 ipv6_addr_copy(&fl_tunnel
.fl6_dst
, remote
);
143 ipv6_addr_copy(&fl_tunnel
.fl6_src
, local
);
144 err
= xfrm_dst_lookup((struct xfrm_dst
**) &rt
,
145 &fl_tunnel
, AF_INET6
);
149 dst_hold(&rt
->u
.dst
);
152 dst_prev
->child
= &rt
->u
.dst
;
153 dst
->path
= &rt
->u
.dst
;
155 ((struct xfrm_dst
*)dst
)->path_cookie
= rt
->rt6i_node
->fn_sernum
;
162 for (; dst_prev
!= &rt
->u
.dst
; dst_prev
= dst_prev
->child
) {
163 struct xfrm_dst
*x
= (struct xfrm_dst
*)dst_prev
;
165 dst_prev
->xfrm
= xfrm
[i
++];
166 dst_prev
->dev
= rt
->u
.dst
.dev
;
168 dev_hold(rt
->u
.dst
.dev
);
169 dst_prev
->obsolete
= -1;
170 dst_prev
->flags
|= DST_HOST
;
171 dst_prev
->lastuse
= jiffies
;
172 dst_prev
->header_len
= header_len
;
173 dst_prev
->trailer_len
= trailer_len
;
174 memcpy(&dst_prev
->metrics
, &x
->route
->metrics
, sizeof(dst_prev
->metrics
));
176 /* Copy neighbour for reachability confirmation */
177 dst_prev
->neighbour
= neigh_clone(rt
->u
.dst
.neighbour
);
178 dst_prev
->input
= rt
->u
.dst
.input
;
179 dst_prev
->output
= xfrm6_output
;
180 /* Sheit... I remember I did this right. Apparently,
181 * it was magically lost, so this code needs audit */
182 x
->u
.rt6
.rt6i_flags
= rt0
->rt6i_flags
&(RTCF_BROADCAST
|RTCF_MULTICAST
|RTCF_LOCAL
);
183 x
->u
.rt6
.rt6i_metric
= rt0
->rt6i_metric
;
184 x
->u
.rt6
.rt6i_node
= rt0
->rt6i_node
;
185 x
->u
.rt6
.rt6i_gateway
= rt0
->rt6i_gateway
;
186 memcpy(&x
->u
.rt6
.rt6i_gateway
, &rt0
->rt6i_gateway
, sizeof(x
->u
.rt6
.rt6i_gateway
));
187 x
->u
.rt6
.rt6i_dst
= rt0
->rt6i_dst
;
188 x
->u
.rt6
.rt6i_src
= rt0
->rt6i_src
;
189 x
->u
.rt6
.rt6i_idev
= rt0
->rt6i_idev
;
190 in6_dev_hold(rt0
->rt6i_idev
);
191 header_len
-= x
->u
.dst
.xfrm
->props
.header_len
;
192 trailer_len
-= x
->u
.dst
.xfrm
->props
.trailer_len
;
205 _decode_session6(struct sk_buff
*skb
, struct flowi
*fl
)
207 u16 offset
= skb
->h
.raw
- skb
->nh
.raw
;
208 struct ipv6hdr
*hdr
= skb
->nh
.ipv6h
;
209 struct ipv6_opt_hdr
*exthdr
;
210 u8 nexthdr
= skb
->nh
.raw
[IP6CB(skb
)->nhoff
];
212 memset(fl
, 0, sizeof(struct flowi
));
213 ipv6_addr_copy(&fl
->fl6_dst
, &hdr
->daddr
);
214 ipv6_addr_copy(&fl
->fl6_src
, &hdr
->saddr
);
216 while (pskb_may_pull(skb
, skb
->nh
.raw
+ offset
+ 1 - skb
->data
)) {
217 exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.raw
+ offset
);
220 case NEXTHDR_ROUTING
:
223 offset
+= ipv6_optlen(exthdr
);
224 nexthdr
= exthdr
->nexthdr
;
225 exthdr
= (struct ipv6_opt_hdr
*)(skb
->nh
.raw
+ offset
);
232 if (pskb_may_pull(skb
, skb
->nh
.raw
+ offset
+ 4 - skb
->data
)) {
233 u16
*ports
= (u16
*)exthdr
;
235 fl
->fl_ip_sport
= ports
[0];
236 fl
->fl_ip_dport
= ports
[1];
242 if (pskb_may_pull(skb
, skb
->nh
.raw
+ offset
+ 2 - skb
->data
)) {
243 u8
*icmp
= (u8
*)exthdr
;
245 fl
->fl_icmp_type
= icmp
[0];
246 fl
->fl_icmp_code
= icmp
[1];
251 /* XXX Why are there these headers? */
256 fl
->fl_ipsec_spi
= 0;
263 static inline int xfrm6_garbage_collect(void)
265 xfrm6_policy_afinfo
.garbage_collect();
266 return (atomic_read(&xfrm6_dst_ops
.entries
) > xfrm6_dst_ops
.gc_thresh
*2);
269 static void xfrm6_update_pmtu(struct dst_entry
*dst
, u32 mtu
)
271 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
272 struct dst_entry
*path
= xdst
->route
;
274 path
->ops
->update_pmtu(path
, mtu
);
277 static void xfrm6_dst_destroy(struct dst_entry
*dst
)
279 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
281 if (likely(xdst
->u
.rt6
.rt6i_idev
))
282 in6_dev_put(xdst
->u
.rt6
.rt6i_idev
);
283 xfrm_dst_destroy(xdst
);
286 static void xfrm6_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
,
289 struct xfrm_dst
*xdst
;
294 xdst
= (struct xfrm_dst
*)dst
;
295 if (xdst
->u
.rt6
.rt6i_idev
->dev
== dev
) {
296 struct inet6_dev
*loopback_idev
= in6_dev_get(&loopback_dev
);
297 BUG_ON(!loopback_idev
);
300 in6_dev_put(xdst
->u
.rt6
.rt6i_idev
);
301 xdst
->u
.rt6
.rt6i_idev
= loopback_idev
;
302 in6_dev_hold(loopback_idev
);
303 xdst
= (struct xfrm_dst
*)xdst
->u
.dst
.child
;
304 } while (xdst
->u
.dst
.xfrm
);
306 __in6_dev_put(loopback_idev
);
309 xfrm_dst_ifdown(dst
, dev
);
312 static struct dst_ops xfrm6_dst_ops
= {
314 .protocol
= __constant_htons(ETH_P_IPV6
),
315 .gc
= xfrm6_garbage_collect
,
316 .update_pmtu
= xfrm6_update_pmtu
,
317 .destroy
= xfrm6_dst_destroy
,
318 .ifdown
= xfrm6_dst_ifdown
,
320 .entry_size
= sizeof(struct xfrm_dst
),
323 static struct xfrm_policy_afinfo xfrm6_policy_afinfo
= {
325 .dst_ops
= &xfrm6_dst_ops
,
326 .dst_lookup
= xfrm6_dst_lookup
,
327 .find_bundle
= __xfrm6_find_bundle
,
328 .bundle_create
= __xfrm6_bundle_create
,
329 .decode_session
= _decode_session6
,
332 static void __init
xfrm6_policy_init(void)
334 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo
);
337 static void xfrm6_policy_fini(void)
339 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo
);
342 void __init
xfrm6_init(void)
348 void xfrm6_fini(void)
350 //xfrm6_input_fini();