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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_uses_gateway;
57
58 int rt_iif;
59
60 u8 rt_gw_family;
61
62 union {
63 __be32 rt_gw4;
64 struct in6_addr rt_gw6;
65 };
66
67
68 u32 rt_mtu_locked:1,
69 rt_pmtu:31;
70
71 struct list_head rt_uncached;
72 struct uncached_list *rt_uncached_list;
73};
74
75static inline bool rt_is_input_route(const struct rtable *rt)
76{
77 return rt->rt_is_input != 0;
78}
79
80static inline bool rt_is_output_route(const struct rtable *rt)
81{
82 return rt->rt_is_input == 0;
83}
84
85static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
86{
87 if (rt->rt_gw_family == AF_INET)
88 return rt->rt_gw4;
89 return daddr;
90}
91
92struct ip_rt_acct {
93 __u32 o_bytes;
94 __u32 o_packets;
95 __u32 i_bytes;
96 __u32 i_packets;
97};
98
99struct rt_cache_stat {
100 unsigned int in_slow_tot;
101 unsigned int in_slow_mc;
102 unsigned int in_no_route;
103 unsigned int in_brd;
104 unsigned int in_martian_dst;
105 unsigned int in_martian_src;
106 unsigned int out_slow_tot;
107 unsigned int out_slow_mc;
108};
109
110extern struct ip_rt_acct __percpu *ip_rt_acct;
111
112struct in_device;
113
114int ip_rt_init(void);
115void rt_cache_flush(struct net *net);
116void rt_flush_dev(struct net_device *dev);
117struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
118 const struct sk_buff *skb);
119struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
120 struct fib_result *res,
121 const struct sk_buff *skb);
122
123static inline struct rtable *__ip_route_output_key(struct net *net,
124 struct flowi4 *flp)
125{
126 return ip_route_output_key_hash(net, flp, NULL);
127}
128
129struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
130 const struct sock *sk);
131struct dst_entry *ipv4_blackhole_route(struct net *net,
132 struct dst_entry *dst_orig);
133
134static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
135{
136 return ip_route_output_flow(net, flp, NULL);
137}
138
139static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
140 __be32 saddr, u8 tos, int oif)
141{
142 struct flowi4 fl4 = {
143 .flowi4_oif = oif,
144 .flowi4_tos = tos,
145 .daddr = daddr,
146 .saddr = saddr,
147 };
148 return ip_route_output_key(net, &fl4);
149}
150
151static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
152 struct sock *sk,
153 __be32 daddr, __be32 saddr,
154 __be16 dport, __be16 sport,
155 __u8 proto, __u8 tos, int oif)
156{
157 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
158 RT_SCOPE_UNIVERSE, proto,
159 sk ? inet_sk_flowi_flags(sk) : 0,
160 daddr, saddr, dport, sport, sock_net_uid(net, sk));
161 if (sk)
162 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
163 return ip_route_output_flow(net, fl4, sk);
164}
165
166static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
167 __be32 daddr, __be32 saddr,
168 __be32 gre_key, __u8 tos, int oif)
169{
170 memset(fl4, 0, sizeof(*fl4));
171 fl4->flowi4_oif = oif;
172 fl4->daddr = daddr;
173 fl4->saddr = saddr;
174 fl4->flowi4_tos = tos;
175 fl4->flowi4_proto = IPPROTO_GRE;
176 fl4->fl4_gre_key = gre_key;
177 return ip_route_output_key(net, fl4);
178}
179int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
180 u8 tos, struct net_device *dev,
181 struct in_device *in_dev, u32 *itag);
182int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
183 u8 tos, struct net_device *devin);
184int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
185 u8 tos, struct net_device *devin,
186 struct fib_result *res);
187
188int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
189 u8 tos, struct net_device *devin,
190 const struct sk_buff *hint);
191
192static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
193 u8 tos, struct net_device *devin)
194{
195 int err;
196
197 rcu_read_lock();
198 err = ip_route_input_noref(skb, dst, src, tos, devin);
199 if (!err) {
200 skb_dst_force(skb);
201 if (!skb_dst(skb))
202 err = -EINVAL;
203 }
204 rcu_read_unlock();
205
206 return err;
207}
208
209void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
210 u8 protocol);
211void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
212void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
213void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
214void ip_rt_send_redirect(struct sk_buff *skb);
215
216unsigned int inet_addr_type(struct net *net, __be32 addr);
217unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
218unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
219 __be32 addr);
220unsigned int inet_addr_type_dev_table(struct net *net,
221 const struct net_device *dev,
222 __be32 addr);
223void ip_rt_multicast_event(struct in_device *);
224int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
225void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
226struct rtable *rt_dst_alloc(struct net_device *dev,
227 unsigned int flags, u16 type,
228 bool nopolicy, bool noxfrm, bool will_cache);
229struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
230
231struct in_ifaddr;
232void fib_add_ifaddr(struct in_ifaddr *);
233void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
234void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
235
236void rt_add_uncached_list(struct rtable *rt);
237void rt_del_uncached_list(struct rtable *rt);
238
239int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
240 u32 table_id, struct fib_info *fi,
241 int *fa_index, int fa_start, unsigned int flags);
242
243static inline void ip_rt_put(struct rtable *rt)
244{
245
246
247
248 BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
249 dst_release(&rt->dst);
250}
251
252#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
253
254extern const __u8 ip_tos2prio[16];
255
256static inline char rt_tos2priority(u8 tos)
257{
258 return ip_tos2prio[IPTOS_TOS(tos)>>1];
259}
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285static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
286 u32 tos, int oif, u8 protocol,
287 __be16 sport, __be16 dport,
288 struct sock *sk)
289{
290 __u8 flow_flags = 0;
291
292 if (inet_sk(sk)->transparent)
293 flow_flags |= FLOWI_FLAG_ANYSRC;
294
295 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
296 protocol, flow_flags, dst, src, dport, sport,
297 sk->sk_uid);
298}
299
300static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
301 __be32 dst, __be32 src, u32 tos,
302 int oif, u8 protocol,
303 __be16 sport, __be16 dport,
304 struct sock *sk)
305{
306 struct net *net = sock_net(sk);
307 struct rtable *rt;
308
309 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
310 sport, dport, sk);
311
312 if (!dst || !src) {
313 rt = __ip_route_output_key(net, fl4);
314 if (IS_ERR(rt))
315 return rt;
316 ip_rt_put(rt);
317 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
318 }
319 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
320 return ip_route_output_flow(net, fl4, sk);
321}
322
323static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
324 __be16 orig_sport, __be16 orig_dport,
325 __be16 sport, __be16 dport,
326 struct sock *sk)
327{
328 if (sport != orig_sport || dport != orig_dport) {
329 fl4->fl4_dport = dport;
330 fl4->fl4_sport = sport;
331 ip_rt_put(rt);
332 flowi4_update_output(fl4, sk->sk_bound_dev_if,
333 RT_CONN_FLAGS(sk), fl4->daddr,
334 fl4->saddr);
335 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
336 return ip_route_output_flow(sock_net(sk), fl4, sk);
337 }
338 return rt;
339}
340
341static inline int inet_iif(const struct sk_buff *skb)
342{
343 struct rtable *rt = skb_rtable(skb);
344
345 if (rt && rt->rt_iif)
346 return rt->rt_iif;
347
348 return skb->skb_iif;
349}
350
351static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
352{
353 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
354 struct net *net = dev_net(dst->dev);
355
356 if (hoplimit == 0)
357 hoplimit = net->ipv4.sysctl_ip_default_ttl;
358 return hoplimit;
359}
360
361static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
362 __be32 daddr)
363{
364 struct neighbour *neigh;
365
366 neigh = __ipv4_neigh_lookup_noref(dev, daddr);
367 if (unlikely(!neigh))
368 neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
369
370 return neigh;
371}
372
373static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
374 struct sk_buff *skb,
375 bool *is_v6gw)
376{
377 struct net_device *dev = rt->dst.dev;
378 struct neighbour *neigh;
379
380 if (likely(rt->rt_gw_family == AF_INET)) {
381 neigh = ip_neigh_gw4(dev, rt->rt_gw4);
382 } else if (rt->rt_gw_family == AF_INET6) {
383 neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
384 *is_v6gw = true;
385 } else {
386 neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
387 }
388 return neigh;
389}
390
391#endif
392
