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20#ifndef _ROUTE_H
21#define _ROUTE_H
22
23#include <net/dst.h>
24#include <net/inetpeer.h>
25#include <net/flow.h>
26#include <net/inet_sock.h>
27#include <net/ip_fib.h>
28#include <net/arp.h>
29#include <net/ndisc.h>
30#include <linux/in_route.h>
31#include <linux/rtnetlink.h>
32#include <linux/rcupdate.h>
33#include <linux/route.h>
34#include <linux/ip.h>
35#include <linux/cache.h>
36#include <linux/security.h>
37
38
39#define IP_MAX_MTU 0xFFFFU
40
41#define RTO_ONLINK 0x01
42
43#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
44#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))
45
46struct fib_nh;
47struct fib_info;
48struct uncached_list;
49struct rtable {
50 struct dst_entry dst;
51
52 int rt_genid;
53 unsigned int rt_flags;
54 __u16 rt_type;
55 __u8 rt_is_input;
56 u8 rt_gw_family;
57
58 int rt_iif;
59
60
61 union {
62 __be32 rt_gw4;
63 struct in6_addr rt_gw6;
64 };
65
66
67 u32 rt_mtu_locked:1,
68 rt_pmtu:31;
69
70 struct list_head rt_uncached;
71 struct uncached_list *rt_uncached_list;
72};
73
74static inline bool rt_is_input_route(const struct rtable *rt)
75{
76 return rt->rt_is_input != 0;
77}
78
79static inline bool rt_is_output_route(const struct rtable *rt)
80{
81 return rt->rt_is_input == 0;
82}
83
84static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
85{
86 if (rt->rt_gw_family == AF_INET)
87 return rt->rt_gw4;
88 return daddr;
89}
90
91struct ip_rt_acct {
92 __u32 o_bytes;
93 __u32 o_packets;
94 __u32 i_bytes;
95 __u32 i_packets;
96};
97
98struct rt_cache_stat {
99 unsigned int in_slow_tot;
100 unsigned int in_slow_mc;
101 unsigned int in_no_route;
102 unsigned int in_brd;
103 unsigned int in_martian_dst;
104 unsigned int in_martian_src;
105 unsigned int out_slow_tot;
106 unsigned int out_slow_mc;
107};
108
109extern struct ip_rt_acct __percpu *ip_rt_acct;
110
111struct in_device;
112
113int ip_rt_init(void);
114void rt_cache_flush(struct net *net);
115void rt_flush_dev(struct net_device *dev);
116struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
117 const struct sk_buff *skb);
118struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
119 struct fib_result *res,
120 const struct sk_buff *skb);
121
122static inline struct rtable *__ip_route_output_key(struct net *net,
123 struct flowi4 *flp)
124{
125 return ip_route_output_key_hash(net, flp, NULL);
126}
127
128struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
129 const struct sock *sk);
130struct dst_entry *ipv4_blackhole_route(struct net *net,
131 struct dst_entry *dst_orig);
132
133static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
134{
135 return ip_route_output_flow(net, flp, NULL);
136}
137
138static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
139 __be32 saddr, u8 tos, int oif)
140{
141 struct flowi4 fl4 = {
142 .flowi4_oif = oif,
143 .flowi4_tos = tos,
144 .daddr = daddr,
145 .saddr = saddr,
146 };
147 return ip_route_output_key(net, &fl4);
148}
149
150static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
151 struct sock *sk,
152 __be32 daddr, __be32 saddr,
153 __be16 dport, __be16 sport,
154 __u8 proto, __u8 tos, int oif)
155{
156 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
157 RT_SCOPE_UNIVERSE, proto,
158 sk ? inet_sk_flowi_flags(sk) : 0,
159 daddr, saddr, dport, sport, sock_net_uid(net, sk));
160 if (sk)
161 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
162 return ip_route_output_flow(net, fl4, sk);
163}
164
165static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
166 __be32 daddr, __be32 saddr,
167 __be32 gre_key, __u8 tos, int oif)
168{
169 memset(fl4, 0, sizeof(*fl4));
170 fl4->flowi4_oif = oif;
171 fl4->daddr = daddr;
172 fl4->saddr = saddr;
173 fl4->flowi4_tos = tos;
174 fl4->flowi4_proto = IPPROTO_GRE;
175 fl4->fl4_gre_key = gre_key;
176 return ip_route_output_key(net, fl4);
177}
178int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
179 u8 tos, struct net_device *dev,
180 struct in_device *in_dev, u32 *itag);
181int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
182 u8 tos, struct net_device *devin);
183int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
184 u8 tos, struct net_device *devin,
185 struct fib_result *res);
186
187static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
188 u8 tos, struct net_device *devin)
189{
190 int err;
191
192 rcu_read_lock();
193 err = ip_route_input_noref(skb, dst, src, tos, devin);
194 if (!err) {
195 skb_dst_force(skb);
196 if (!skb_dst(skb))
197 err = -EINVAL;
198 }
199 rcu_read_unlock();
200
201 return err;
202}
203
204void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
205 u8 protocol);
206void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
207void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
208void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
209void ip_rt_send_redirect(struct sk_buff *skb);
210
211unsigned int inet_addr_type(struct net *net, __be32 addr);
212unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
213unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
214 __be32 addr);
215unsigned int inet_addr_type_dev_table(struct net *net,
216 const struct net_device *dev,
217 __be32 addr);
218void ip_rt_multicast_event(struct in_device *);
219int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
220void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
221struct rtable *rt_dst_alloc(struct net_device *dev,
222 unsigned int flags, u16 type,
223 bool nopolicy, bool noxfrm, bool will_cache);
224struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
225
226struct in_ifaddr;
227void fib_add_ifaddr(struct in_ifaddr *);
228void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
229void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
230
231void rt_add_uncached_list(struct rtable *rt);
232void rt_del_uncached_list(struct rtable *rt);
233
234int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
235 u32 table_id, struct fib_info *fi,
236 int *fa_index, int fa_start, unsigned int flags);
237
238static inline void ip_rt_put(struct rtable *rt)
239{
240
241
242
243 BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
244 dst_release(&rt->dst);
245}
246
247#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
248
249extern const __u8 ip_tos2prio[16];
250
251static inline char rt_tos2priority(u8 tos)
252{
253 return ip_tos2prio[IPTOS_TOS(tos)>>1];
254}
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280static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
281 u32 tos, int oif, u8 protocol,
282 __be16 sport, __be16 dport,
283 struct sock *sk)
284{
285 __u8 flow_flags = 0;
286
287 if (inet_sk(sk)->transparent)
288 flow_flags |= FLOWI_FLAG_ANYSRC;
289
290 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
291 protocol, flow_flags, dst, src, dport, sport,
292 sk->sk_uid);
293}
294
295static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
296 __be32 dst, __be32 src, u32 tos,
297 int oif, u8 protocol,
298 __be16 sport, __be16 dport,
299 struct sock *sk)
300{
301 struct net *net = sock_net(sk);
302 struct rtable *rt;
303
304 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
305 sport, dport, sk);
306
307 if (!dst || !src) {
308 rt = __ip_route_output_key(net, fl4);
309 if (IS_ERR(rt))
310 return rt;
311 ip_rt_put(rt);
312 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
313 }
314 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
315 return ip_route_output_flow(net, fl4, sk);
316}
317
318static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
319 __be16 orig_sport, __be16 orig_dport,
320 __be16 sport, __be16 dport,
321 struct sock *sk)
322{
323 if (sport != orig_sport || dport != orig_dport) {
324 fl4->fl4_dport = dport;
325 fl4->fl4_sport = sport;
326 ip_rt_put(rt);
327 flowi4_update_output(fl4, sk->sk_bound_dev_if,
328 RT_CONN_FLAGS(sk), fl4->daddr,
329 fl4->saddr);
330 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
331 return ip_route_output_flow(sock_net(sk), fl4, sk);
332 }
333 return rt;
334}
335
336static inline int inet_iif(const struct sk_buff *skb)
337{
338 struct rtable *rt = skb_rtable(skb);
339
340 if (rt && rt->rt_iif)
341 return rt->rt_iif;
342
343 return skb->skb_iif;
344}
345
346static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
347{
348 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
349 struct net *net = dev_net(dst->dev);
350
351 if (hoplimit == 0)
352 hoplimit = net->ipv4.sysctl_ip_default_ttl;
353 return hoplimit;
354}
355
356static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
357 __be32 daddr)
358{
359 struct neighbour *neigh;
360
361 neigh = __ipv4_neigh_lookup_noref(dev, daddr);
362 if (unlikely(!neigh))
363 neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
364
365 return neigh;
366}
367
368static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
369 struct sk_buff *skb,
370 bool *is_v6gw)
371{
372 struct net_device *dev = rt->dst.dev;
373 struct neighbour *neigh;
374
375 if (likely(rt->rt_gw_family == AF_INET)) {
376 neigh = ip_neigh_gw4(dev, rt->rt_gw4);
377 } else if (rt->rt_gw_family == AF_INET6) {
378 neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
379 *is_v6gw = true;
380 } else {
381 neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
382 }
383 return neigh;
384}
385
386#endif
387
