Fix Intel IOMMU write-buffer flushing
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / net / ipv4 / xfrm4_policy.c
blob2ad24ba31f9de591df4305d7b3d406318ec18976
1 /*
2 * xfrm4_policy.c
4 * Changes:
5 * Kazunori MIYAZAWA @USAGI
6 * YOSHIFUJI Hideaki @USAGI
7 * Split up af-specific portion
9 */
11 #include <linux/err.h>
12 #include <linux/kernel.h>
13 #include <linux/inetdevice.h>
14 #include <net/dst.h>
15 #include <net/xfrm.h>
16 #include <net/ip.h>
18 static struct dst_ops xfrm4_dst_ops;
19 static struct xfrm_policy_afinfo xfrm4_policy_afinfo;
21 static struct dst_entry *xfrm4_dst_lookup(struct net *net, int tos,
22 xfrm_address_t *saddr,
23 xfrm_address_t *daddr)
25 struct flowi fl = {
26 .nl_u = {
27 .ip4_u = {
28 .tos = tos,
29 .daddr = daddr->a4,
33 struct dst_entry *dst;
34 struct rtable *rt;
35 int err;
37 if (saddr)
38 fl.fl4_src = saddr->a4;
40 err = __ip_route_output_key(net, &rt, &fl);
41 dst = &rt->u.dst;
42 if (err)
43 dst = ERR_PTR(err);
44 return dst;
47 static int xfrm4_get_saddr(struct net *net,
48 xfrm_address_t *saddr, xfrm_address_t *daddr)
50 struct dst_entry *dst;
51 struct rtable *rt;
53 dst = xfrm4_dst_lookup(net, 0, NULL, daddr);
54 if (IS_ERR(dst))
55 return -EHOSTUNREACH;
57 rt = (struct rtable *)dst;
58 saddr->a4 = rt->rt_src;
59 dst_release(dst);
60 return 0;
63 static struct dst_entry *
64 __xfrm4_find_bundle(struct flowi *fl, struct xfrm_policy *policy)
66 struct dst_entry *dst;
68 read_lock_bh(&policy->lock);
69 for (dst = policy->bundles; dst; dst = dst->next) {
70 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
71 if (xdst->u.rt.fl.oif == fl->oif && /*XXX*/
72 xdst->u.rt.fl.fl4_dst == fl->fl4_dst &&
73 xdst->u.rt.fl.fl4_src == fl->fl4_src &&
74 xdst->u.rt.fl.fl4_tos == fl->fl4_tos &&
75 xfrm_bundle_ok(policy, xdst, fl, AF_INET, 0)) {
76 dst_clone(dst);
77 break;
80 read_unlock_bh(&policy->lock);
81 return dst;
84 static int xfrm4_get_tos(struct flowi *fl)
86 return fl->fl4_tos;
89 static int xfrm4_init_path(struct xfrm_dst *path, struct dst_entry *dst,
90 int nfheader_len)
92 return 0;
95 static int xfrm4_fill_dst(struct xfrm_dst *xdst, struct net_device *dev)
97 struct rtable *rt = (struct rtable *)xdst->route;
99 xdst->u.rt.fl = rt->fl;
101 xdst->u.dst.dev = dev;
102 dev_hold(dev);
104 xdst->u.rt.idev = in_dev_get(dev);
105 if (!xdst->u.rt.idev)
106 return -ENODEV;
108 xdst->u.rt.peer = rt->peer;
109 if (rt->peer)
110 atomic_inc(&rt->peer->refcnt);
112 /* Sheit... I remember I did this right. Apparently,
113 * it was magically lost, so this code needs audit */
114 xdst->u.rt.rt_flags = rt->rt_flags & (RTCF_BROADCAST | RTCF_MULTICAST |
115 RTCF_LOCAL);
116 xdst->u.rt.rt_type = rt->rt_type;
117 xdst->u.rt.rt_src = rt->rt_src;
118 xdst->u.rt.rt_dst = rt->rt_dst;
119 xdst->u.rt.rt_gateway = rt->rt_gateway;
120 xdst->u.rt.rt_spec_dst = rt->rt_spec_dst;
122 return 0;
125 static void
126 _decode_session4(struct sk_buff *skb, struct flowi *fl, int reverse)
128 struct iphdr *iph = ip_hdr(skb);
129 u8 *xprth = skb_network_header(skb) + iph->ihl * 4;
131 memset(fl, 0, sizeof(struct flowi));
132 if (!(iph->frag_off & htons(IP_MF | IP_OFFSET))) {
133 switch (iph->protocol) {
134 case IPPROTO_UDP:
135 case IPPROTO_UDPLITE:
136 case IPPROTO_TCP:
137 case IPPROTO_SCTP:
138 case IPPROTO_DCCP:
139 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
140 __be16 *ports = (__be16 *)xprth;
142 fl->fl_ip_sport = ports[!!reverse];
143 fl->fl_ip_dport = ports[!reverse];
145 break;
147 case IPPROTO_ICMP:
148 if (pskb_may_pull(skb, xprth + 2 - skb->data)) {
149 u8 *icmp = xprth;
151 fl->fl_icmp_type = icmp[0];
152 fl->fl_icmp_code = icmp[1];
154 break;
156 case IPPROTO_ESP:
157 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
158 __be32 *ehdr = (__be32 *)xprth;
160 fl->fl_ipsec_spi = ehdr[0];
162 break;
164 case IPPROTO_AH:
165 if (pskb_may_pull(skb, xprth + 8 - skb->data)) {
166 __be32 *ah_hdr = (__be32*)xprth;
168 fl->fl_ipsec_spi = ah_hdr[1];
170 break;
172 case IPPROTO_COMP:
173 if (pskb_may_pull(skb, xprth + 4 - skb->data)) {
174 __be16 *ipcomp_hdr = (__be16 *)xprth;
176 fl->fl_ipsec_spi = htonl(ntohs(ipcomp_hdr[1]));
178 break;
179 default:
180 fl->fl_ipsec_spi = 0;
181 break;
184 fl->proto = iph->protocol;
185 fl->fl4_dst = reverse ? iph->saddr : iph->daddr;
186 fl->fl4_src = reverse ? iph->daddr : iph->saddr;
187 fl->fl4_tos = iph->tos;
190 static inline int xfrm4_garbage_collect(struct dst_ops *ops)
192 xfrm4_policy_afinfo.garbage_collect(&init_net);
193 return (atomic_read(&xfrm4_dst_ops.entries) > xfrm4_dst_ops.gc_thresh*2);
196 static void xfrm4_update_pmtu(struct dst_entry *dst, u32 mtu)
198 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
199 struct dst_entry *path = xdst->route;
201 path->ops->update_pmtu(path, mtu);
204 static void xfrm4_dst_destroy(struct dst_entry *dst)
206 struct xfrm_dst *xdst = (struct xfrm_dst *)dst;
208 if (likely(xdst->u.rt.idev))
209 in_dev_put(xdst->u.rt.idev);
210 if (likely(xdst->u.rt.peer))
211 inet_putpeer(xdst->u.rt.peer);
212 xfrm_dst_destroy(xdst);
215 static void xfrm4_dst_ifdown(struct dst_entry *dst, struct net_device *dev,
216 int unregister)
218 struct xfrm_dst *xdst;
220 if (!unregister)
221 return;
223 xdst = (struct xfrm_dst *)dst;
224 if (xdst->u.rt.idev->dev == dev) {
225 struct in_device *loopback_idev =
226 in_dev_get(dev_net(dev)->loopback_dev);
227 BUG_ON(!loopback_idev);
229 do {
230 in_dev_put(xdst->u.rt.idev);
231 xdst->u.rt.idev = loopback_idev;
232 in_dev_hold(loopback_idev);
233 xdst = (struct xfrm_dst *)xdst->u.dst.child;
234 } while (xdst->u.dst.xfrm);
236 __in_dev_put(loopback_idev);
239 xfrm_dst_ifdown(dst, dev);
242 static struct dst_ops xfrm4_dst_ops = {
243 .family = AF_INET,
244 .protocol = __constant_htons(ETH_P_IP),
245 .gc = xfrm4_garbage_collect,
246 .update_pmtu = xfrm4_update_pmtu,
247 .destroy = xfrm4_dst_destroy,
248 .ifdown = xfrm4_dst_ifdown,
249 .local_out = __ip_local_out,
250 .gc_thresh = 1024,
251 .entries = ATOMIC_INIT(0),
254 static struct xfrm_policy_afinfo xfrm4_policy_afinfo = {
255 .family = AF_INET,
256 .dst_ops = &xfrm4_dst_ops,
257 .dst_lookup = xfrm4_dst_lookup,
258 .get_saddr = xfrm4_get_saddr,
259 .find_bundle = __xfrm4_find_bundle,
260 .decode_session = _decode_session4,
261 .get_tos = xfrm4_get_tos,
262 .init_path = xfrm4_init_path,
263 .fill_dst = xfrm4_fill_dst,
266 static void __init xfrm4_policy_init(void)
268 xfrm_policy_register_afinfo(&xfrm4_policy_afinfo);
271 static void __exit xfrm4_policy_fini(void)
273 xfrm_policy_unregister_afinfo(&xfrm4_policy_afinfo);
276 void __init xfrm4_init(void)
278 xfrm4_state_init();
279 xfrm4_policy_init();