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/err.h>
15 #include <linux/kernel.h>
16 #include <linux/netdevice.h>
17 #include <net/addrconf.h>
22 #include <net/ip6_route.h>
23 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
27 static struct dst_ops xfrm6_dst_ops
;
28 static struct xfrm_policy_afinfo xfrm6_policy_afinfo
;
30 static struct dst_entry
*xfrm6_dst_lookup(int tos
, xfrm_address_t
*saddr
,
31 xfrm_address_t
*daddr
)
34 struct dst_entry
*dst
;
37 memcpy(&fl
.fl6_dst
, daddr
, sizeof(fl
.fl6_dst
));
39 memcpy(&fl
.fl6_src
, saddr
, sizeof(fl
.fl6_src
));
41 dst
= ip6_route_output(NULL
, &fl
);
52 static int xfrm6_get_saddr(xfrm_address_t
*saddr
, xfrm_address_t
*daddr
)
54 struct dst_entry
*dst
;
56 dst
= xfrm6_dst_lookup(0, NULL
, daddr
);
60 ipv6_get_saddr(dst
, (struct in6_addr
*)&daddr
->a6
,
61 (struct in6_addr
*)&saddr
->a6
);
66 static struct dst_entry
*
67 __xfrm6_find_bundle(struct flowi
*fl
, struct xfrm_policy
*policy
)
69 struct dst_entry
*dst
;
71 /* Still not clear if we should set fl->fl6_{src,dst}... */
72 read_lock_bh(&policy
->lock
);
73 for (dst
= policy
->bundles
; dst
; dst
= dst
->next
) {
74 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
75 struct in6_addr fl_dst_prefix
, fl_src_prefix
;
77 ipv6_addr_prefix(&fl_dst_prefix
,
79 xdst
->u
.rt6
.rt6i_dst
.plen
);
80 ipv6_addr_prefix(&fl_src_prefix
,
82 xdst
->u
.rt6
.rt6i_src
.plen
);
83 if (ipv6_addr_equal(&xdst
->u
.rt6
.rt6i_dst
.addr
, &fl_dst_prefix
) &&
84 ipv6_addr_equal(&xdst
->u
.rt6
.rt6i_src
.addr
, &fl_src_prefix
) &&
85 xfrm_bundle_ok(policy
, xdst
, fl
, AF_INET6
,
86 (xdst
->u
.rt6
.rt6i_dst
.plen
!= 128 ||
87 xdst
->u
.rt6
.rt6i_src
.plen
!= 128))) {
92 read_unlock_bh(&policy
->lock
);
96 /* Allocate chain of dst_entry's, attach known xfrm's, calculate
97 * all the metrics... Shortly, bundle a bundle.
101 __xfrm6_bundle_create(struct xfrm_policy
*policy
, struct xfrm_state
**xfrm
, int nx
,
102 struct flowi
*fl
, struct dst_entry
**dst_p
)
104 struct dst_entry
*dst
, *dst_prev
;
105 struct rt6_info
*rt0
= (struct rt6_info
*)(*dst_p
);
106 struct rt6_info
*rt
= rt0
;
112 dst
= dst_prev
= NULL
;
113 dst_hold(&rt
->u
.dst
);
115 for (i
= 0; i
< nx
; i
++) {
116 struct dst_entry
*dst1
= dst_alloc(&xfrm6_dst_ops
);
117 struct xfrm_dst
*xdst
;
119 if (unlikely(dst1
== NULL
)) {
121 dst_release(&rt
->u
.dst
);
128 dst_prev
->child
= dst1
;
129 dst1
->flags
|= DST_NOHASH
;
133 xdst
= (struct xfrm_dst
*)dst1
;
134 xdst
->route
= &rt
->u
.dst
;
135 xdst
->genid
= xfrm
[i
]->genid
;
137 xdst
->route_cookie
= rt
->rt6i_node
->fn_sernum
;
139 dst1
->next
= dst_prev
;
142 if (xfrm
[i
]->type
->flags
& XFRM_TYPE_NON_FRAGMENT
)
143 ((struct rt6_info
*)dst
)->nfheader_len
+=
144 xfrm
[i
]->props
.header_len
;
145 header_len
+= xfrm
[i
]->props
.header_len
;
146 trailer_len
+= xfrm
[i
]->props
.trailer_len
;
148 if (xfrm
[i
]->props
.mode
!= XFRM_MODE_TRANSPORT
) {
149 dst1
= xfrm_dst_lookup(xfrm
[i
], 0);
154 rt
= (struct rt6_info
*)dst1
;
156 dst_hold(&rt
->u
.dst
);
159 dst_prev
->child
= &rt
->u
.dst
;
160 dst
->path
= &rt
->u
.dst
;
162 /* Copy neighbour for reachability confirmation */
163 dst
->neighbour
= neigh_clone(rt
->u
.dst
.neighbour
);
166 ((struct xfrm_dst
*)dst
)->path_cookie
= rt
->rt6i_node
->fn_sernum
;
174 for (; dst_prev
!= &rt
->u
.dst
; dst_prev
= dst_prev
->child
) {
175 struct xfrm_dst
*x
= (struct xfrm_dst
*)dst_prev
;
177 dst_prev
->xfrm
= xfrm
[i
++];
178 dst_prev
->dev
= rt
->u
.dst
.dev
;
181 dev_hold(rt
->u
.dst
.dev
);
183 x
->u
.rt6
.rt6i_idev
= in6_dev_get(rt
->u
.dst
.dev
);
184 if (!x
->u
.rt6
.rt6i_idev
)
187 dst_prev
->obsolete
= -1;
188 dst_prev
->flags
|= DST_HOST
;
189 dst_prev
->lastuse
= jiffies
;
190 dst_prev
->header_len
= header_len
;
191 dst_prev
->trailer_len
= trailer_len
;
192 memcpy(&dst_prev
->metrics
, &x
->route
->metrics
, sizeof(dst_prev
->metrics
));
194 dst_prev
->input
= dst_discard
;
195 dst_prev
->output
= dst_prev
->xfrm
->outer_mode
->afinfo
->output
;
196 /* Sheit... I remember I did this right. Apparently,
197 * it was magically lost, so this code needs audit */
198 x
->u
.rt6
.rt6i_flags
= rt0
->rt6i_flags
&(RTF_ANYCAST
|RTF_LOCAL
);
199 x
->u
.rt6
.rt6i_metric
= rt0
->rt6i_metric
;
200 x
->u
.rt6
.rt6i_node
= rt0
->rt6i_node
;
201 x
->u
.rt6
.rt6i_gateway
= rt0
->rt6i_gateway
;
202 memcpy(&x
->u
.rt6
.rt6i_gateway
, &rt0
->rt6i_gateway
, sizeof(x
->u
.rt6
.rt6i_gateway
));
203 x
->u
.rt6
.rt6i_dst
= rt0
->rt6i_dst
;
204 x
->u
.rt6
.rt6i_src
= rt0
->rt6i_src
;
205 header_len
-= x
->u
.dst
.xfrm
->props
.header_len
;
206 trailer_len
-= x
->u
.dst
.xfrm
->props
.trailer_len
;
219 _decode_session6(struct sk_buff
*skb
, struct flowi
*fl
)
221 u16 offset
= skb_network_header_len(skb
);
222 struct ipv6hdr
*hdr
= ipv6_hdr(skb
);
223 struct ipv6_opt_hdr
*exthdr
;
224 const unsigned char *nh
= skb_network_header(skb
);
225 u8 nexthdr
= nh
[IP6CB(skb
)->nhoff
];
227 memset(fl
, 0, sizeof(struct flowi
));
228 ipv6_addr_copy(&fl
->fl6_dst
, &hdr
->daddr
);
229 ipv6_addr_copy(&fl
->fl6_src
, &hdr
->saddr
);
231 while (pskb_may_pull(skb
, nh
+ offset
+ 1 - skb
->data
)) {
232 nh
= skb_network_header(skb
);
233 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
236 case NEXTHDR_ROUTING
:
239 offset
+= ipv6_optlen(exthdr
);
240 nexthdr
= exthdr
->nexthdr
;
241 exthdr
= (struct ipv6_opt_hdr
*)(nh
+ offset
);
245 case IPPROTO_UDPLITE
:
249 if (pskb_may_pull(skb
, nh
+ offset
+ 4 - skb
->data
)) {
250 __be16
*ports
= (__be16
*)exthdr
;
252 fl
->fl_ip_sport
= ports
[0];
253 fl
->fl_ip_dport
= ports
[1];
259 if (pskb_may_pull(skb
, nh
+ offset
+ 2 - skb
->data
)) {
260 u8
*icmp
= (u8
*)exthdr
;
262 fl
->fl_icmp_type
= icmp
[0];
263 fl
->fl_icmp_code
= icmp
[1];
268 #if defined(CONFIG_IPV6_MIP6) || defined(CONFIG_IPV6_MIP6_MODULE)
270 if (pskb_may_pull(skb
, nh
+ offset
+ 3 - skb
->data
)) {
272 mh
= (struct ip6_mh
*)exthdr
;
274 fl
->fl_mh_type
= mh
->ip6mh_type
;
280 /* XXX Why are there these headers? */
285 fl
->fl_ipsec_spi
= 0;
292 static inline int xfrm6_garbage_collect(void)
294 xfrm6_policy_afinfo
.garbage_collect();
295 return (atomic_read(&xfrm6_dst_ops
.entries
) > xfrm6_dst_ops
.gc_thresh
*2);
298 static void xfrm6_update_pmtu(struct dst_entry
*dst
, u32 mtu
)
300 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
301 struct dst_entry
*path
= xdst
->route
;
303 path
->ops
->update_pmtu(path
, mtu
);
306 static void xfrm6_dst_destroy(struct dst_entry
*dst
)
308 struct xfrm_dst
*xdst
= (struct xfrm_dst
*)dst
;
310 if (likely(xdst
->u
.rt6
.rt6i_idev
))
311 in6_dev_put(xdst
->u
.rt6
.rt6i_idev
);
312 xfrm_dst_destroy(xdst
);
315 static void xfrm6_dst_ifdown(struct dst_entry
*dst
, struct net_device
*dev
,
318 struct xfrm_dst
*xdst
;
323 xdst
= (struct xfrm_dst
*)dst
;
324 if (xdst
->u
.rt6
.rt6i_idev
->dev
== dev
) {
325 struct inet6_dev
*loopback_idev
= in6_dev_get(init_net
.loopback_dev
);
326 BUG_ON(!loopback_idev
);
329 in6_dev_put(xdst
->u
.rt6
.rt6i_idev
);
330 xdst
->u
.rt6
.rt6i_idev
= loopback_idev
;
331 in6_dev_hold(loopback_idev
);
332 xdst
= (struct xfrm_dst
*)xdst
->u
.dst
.child
;
333 } while (xdst
->u
.dst
.xfrm
);
335 __in6_dev_put(loopback_idev
);
338 xfrm_dst_ifdown(dst
, dev
);
341 static struct dst_ops xfrm6_dst_ops
= {
343 .protocol
= __constant_htons(ETH_P_IPV6
),
344 .gc
= xfrm6_garbage_collect
,
345 .update_pmtu
= xfrm6_update_pmtu
,
346 .destroy
= xfrm6_dst_destroy
,
347 .ifdown
= xfrm6_dst_ifdown
,
349 .entry_size
= sizeof(struct xfrm_dst
),
352 static struct xfrm_policy_afinfo xfrm6_policy_afinfo
= {
354 .dst_ops
= &xfrm6_dst_ops
,
355 .dst_lookup
= xfrm6_dst_lookup
,
356 .get_saddr
= xfrm6_get_saddr
,
357 .find_bundle
= __xfrm6_find_bundle
,
358 .bundle_create
= __xfrm6_bundle_create
,
359 .decode_session
= _decode_session6
,
362 static void __init
xfrm6_policy_init(void)
364 xfrm_policy_register_afinfo(&xfrm6_policy_afinfo
);
367 static void xfrm6_policy_fini(void)
369 xfrm_policy_unregister_afinfo(&xfrm6_policy_afinfo
);
372 void __init
xfrm6_init(void)
378 void xfrm6_fini(void)
380 //xfrm6_input_fini();