5 * YOSHIFUJI Hideaki @USAGI
6 * Split up af-specific portion
10 #include <linux/slab.h>
11 #include <linux/module.h>
12 #include <linux/netdevice.h>
17 static struct kmem_cache
*secpath_cachep __read_mostly
;
19 void __secpath_destroy(struct sec_path
*sp
)
22 for (i
= 0; i
< sp
->len
; i
++)
23 xfrm_state_put(sp
->xvec
[i
]);
24 kmem_cache_free(secpath_cachep
, sp
);
26 EXPORT_SYMBOL(__secpath_destroy
);
28 struct sec_path
*secpath_dup(struct sec_path
*src
)
32 sp
= kmem_cache_alloc(secpath_cachep
, GFP_ATOMIC
);
40 memcpy(sp
, src
, sizeof(*sp
));
41 for (i
= 0; i
< sp
->len
; i
++)
42 xfrm_state_hold(sp
->xvec
[i
]);
44 atomic_set(&sp
->refcnt
, 1);
47 EXPORT_SYMBOL(secpath_dup
);
49 /* Fetch spi and seq from ipsec header */
51 int xfrm_parse_spi(struct sk_buff
*skb
, u8 nexthdr
, __be32
*spi
, __be32
*seq
)
53 int offset
, offset_seq
;
58 hlen
= sizeof(struct ip_auth_hdr
);
59 offset
= offsetof(struct ip_auth_hdr
, spi
);
60 offset_seq
= offsetof(struct ip_auth_hdr
, seq_no
);
63 hlen
= sizeof(struct ip_esp_hdr
);
64 offset
= offsetof(struct ip_esp_hdr
, spi
);
65 offset_seq
= offsetof(struct ip_esp_hdr
, seq_no
);
68 if (!pskb_may_pull(skb
, sizeof(struct ip_comp_hdr
)))
70 *spi
= htonl(ntohs(*(__be16
*)(skb_transport_header(skb
) + 2)));
77 if (!pskb_may_pull(skb
, hlen
))
80 *spi
= *(__be32
*)(skb_transport_header(skb
) + offset
);
81 *seq
= *(__be32
*)(skb_transport_header(skb
) + offset_seq
);
84 EXPORT_SYMBOL(xfrm_parse_spi
);
86 int xfrm_prepare_input(struct xfrm_state
*x
, struct sk_buff
*skb
)
90 err
= x
->outer_mode
->afinfo
->extract_input(x
, skb
);
94 skb
->protocol
= x
->inner_mode
->afinfo
->eth_proto
;
95 return x
->inner_mode
->input2(x
, skb
);
97 EXPORT_SYMBOL(xfrm_prepare_input
);
99 int xfrm_input(struct sk_buff
*skb
, int nexthdr
, __be32 spi
, int encap_type
)
103 struct xfrm_state
*x
;
104 xfrm_address_t
*daddr
;
108 /* A negative encap_type indicates async resumption. */
109 if (encap_type
< 0) {
111 x
= skb
->sp
->xvec
[skb
->sp
->len
- 1];
112 seq
= XFRM_SKB_CB(skb
)->seq
;
116 /* Allocate new secpath or COW existing one. */
117 if (!skb
->sp
|| atomic_read(&skb
->sp
->refcnt
) != 1) {
120 sp
= secpath_dup(skb
->sp
);
124 secpath_put(skb
->sp
);
128 daddr
= (xfrm_address_t
*)(skb_network_header(skb
) +
129 XFRM_SPI_SKB_CB(skb
)->daddroff
);
132 if (!spi
&& (err
= xfrm_parse_spi(skb
, nexthdr
, &spi
, &seq
)) != 0)
136 if (skb
->sp
->len
== XFRM_MAX_DEPTH
)
139 x
= xfrm_state_lookup(daddr
, spi
, nexthdr
, AF_INET
);
143 skb
->sp
->xvec
[skb
->sp
->len
++] = x
;
146 if (unlikely(x
->km
.state
!= XFRM_STATE_VALID
))
149 if ((x
->encap
? x
->encap
->encap_type
: 0) != encap_type
)
152 if (x
->props
.replay_window
&& xfrm_replay_check(x
, seq
))
155 if (xfrm_state_check_expire(x
))
158 spin_unlock(&x
->lock
);
160 XFRM_SKB_CB(skb
)->seq
= seq
;
162 nexthdr
= x
->type
->input(x
, skb
);
164 if (nexthdr
== -EINPROGRESS
)
170 if (nexthdr
== -EBADMSG
)
171 x
->stats
.integrity_failed
++;
175 /* only the first xfrm gets the encap type */
178 if (x
->props
.replay_window
)
179 xfrm_replay_advance(x
, seq
);
181 x
->curlft
.bytes
+= skb
->len
;
184 spin_unlock(&x
->lock
);
186 XFRM_MODE_SKB_CB(skb
)->protocol
= nexthdr
;
188 if (x
->inner_mode
->input(x
, skb
))
191 if (x
->outer_mode
->flags
& XFRM_MODE_FLAG_TUNNEL
) {
197 * We need the inner address. However, we only get here for
198 * transport mode so the outer address is identical.
200 daddr
= &x
->id
.daddr
;
202 err
= xfrm_parse_spi(skb
, nexthdr
, &spi
, &seq
);
210 dst_release(skb
->dst
);
215 return x
->inner_mode
->afinfo
->transport_finish(skb
, async
);
219 spin_unlock(&x
->lock
);
224 EXPORT_SYMBOL(xfrm_input
);
226 int xfrm_input_resume(struct sk_buff
*skb
, int nexthdr
)
228 return xfrm_input(skb
, nexthdr
, 0, -1);
230 EXPORT_SYMBOL(xfrm_input_resume
);
232 void __init
xfrm_input_init(void)
234 secpath_cachep
= kmem_cache_create("secpath_cache",
235 sizeof(struct sec_path
),
236 0, SLAB_HWCACHE_ALIGN
|SLAB_PANIC
,