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24#ifndef _ROUTE_H
25#define _ROUTE_H
26
27#include <net/dst.h>
28#include <net/inetpeer.h>
29#include <net/flow.h>
30#include <net/inet_sock.h>
31#include <linux/in_route.h>
32#include <linux/rtnetlink.h>
33#include <linux/rcupdate.h>
34#include <linux/route.h>
35#include <linux/ip.h>
36#include <linux/cache.h>
37#include <linux/security.h>
38
39
40#define IP_MAX_MTU 0xFFFFU
41
42#define RTO_ONLINK 0x01
43
44#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
45#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))
46
47struct fib_nh;
48struct fib_info;
49struct uncached_list;
50struct rtable {
51 struct dst_entry dst;
52
53 int rt_genid;
54 unsigned int rt_flags;
55 __u16 rt_type;
56 __u8 rt_is_input;
57 __u8 rt_uses_gateway;
58
59 int rt_iif;
60
61
62 __be32 rt_gateway;
63
64
65 u32 rt_pmtu;
66
67 struct list_head rt_uncached;
68 struct uncached_list *rt_uncached_list;
69};
70
71static inline bool rt_is_input_route(const struct rtable *rt)
72{
73 return rt->rt_is_input != 0;
74}
75
76static inline bool rt_is_output_route(const struct rtable *rt)
77{
78 return rt->rt_is_input == 0;
79}
80
81static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
82{
83 if (rt->rt_gateway)
84 return rt->rt_gateway;
85 return daddr;
86}
87
88struct ip_rt_acct {
89 __u32 o_bytes;
90 __u32 o_packets;
91 __u32 i_bytes;
92 __u32 i_packets;
93};
94
95struct rt_cache_stat {
96 unsigned int in_slow_tot;
97 unsigned int in_slow_mc;
98 unsigned int in_no_route;
99 unsigned int in_brd;
100 unsigned int in_martian_dst;
101 unsigned int in_martian_src;
102 unsigned int out_slow_tot;
103 unsigned int out_slow_mc;
104};
105
106extern struct ip_rt_acct __percpu *ip_rt_acct;
107
108struct in_device;
109
110int ip_rt_init(void);
111void rt_cache_flush(struct net *net);
112void rt_flush_dev(struct net_device *dev);
113struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);
114struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
115 struct sock *sk);
116struct dst_entry *ipv4_blackhole_route(struct net *net,
117 struct dst_entry *dst_orig);
118
119static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
120{
121 return ip_route_output_flow(net, flp, NULL);
122}
123
124static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
125 __be32 saddr, u8 tos, int oif)
126{
127 struct flowi4 fl4 = {
128 .flowi4_oif = oif,
129 .flowi4_tos = tos,
130 .daddr = daddr,
131 .saddr = saddr,
132 };
133 return ip_route_output_key(net, &fl4);
134}
135
136static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
137 struct sock *sk,
138 __be32 daddr, __be32 saddr,
139 __be16 dport, __be16 sport,
140 __u8 proto, __u8 tos, int oif)
141{
142 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
143 RT_SCOPE_UNIVERSE, proto,
144 sk ? inet_sk_flowi_flags(sk) : 0,
145 daddr, saddr, dport, sport);
146 if (sk)
147 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
148 return ip_route_output_flow(net, fl4, sk);
149}
150
151static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
152 __be32 daddr, __be32 saddr,
153 __be32 gre_key, __u8 tos, int oif)
154{
155 memset(fl4, 0, sizeof(*fl4));
156 fl4->flowi4_oif = oif;
157 fl4->daddr = daddr;
158 fl4->saddr = saddr;
159 fl4->flowi4_tos = tos;
160 fl4->flowi4_proto = IPPROTO_GRE;
161 fl4->fl4_gre_key = gre_key;
162 return ip_route_output_key(net, fl4);
163}
164
165int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
166 u8 tos, struct net_device *devin);
167
168static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
169 u8 tos, struct net_device *devin)
170{
171 int err;
172
173 rcu_read_lock();
174 err = ip_route_input_noref(skb, dst, src, tos, devin);
175 if (!err)
176 skb_dst_force(skb);
177 rcu_read_unlock();
178
179 return err;
180}
181
182void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
183 u32 mark, u8 protocol, int flow_flags);
184void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
185void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
186 u8 protocol, int flow_flags);
187void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
188void ip_rt_send_redirect(struct sk_buff *skb);
189
190unsigned int inet_addr_type(struct net *net, __be32 addr);
191unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
192 __be32 addr);
193void ip_rt_multicast_event(struct in_device *);
194int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
195void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
196
197struct in_ifaddr;
198void fib_add_ifaddr(struct in_ifaddr *);
199void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
200
201static inline void ip_rt_put(struct rtable *rt)
202{
203
204
205
206 BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
207 dst_release(&rt->dst);
208}
209
210#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
211
212extern const __u8 ip_tos2prio[16];
213
214static inline char rt_tos2priority(u8 tos)
215{
216 return ip_tos2prio[IPTOS_TOS(tos)>>1];
217}
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243static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
244 u32 tos, int oif, u8 protocol,
245 __be16 sport, __be16 dport,
246 struct sock *sk)
247{
248 __u8 flow_flags = 0;
249
250 if (inet_sk(sk)->transparent)
251 flow_flags |= FLOWI_FLAG_ANYSRC;
252
253 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
254 protocol, flow_flags, dst, src, dport, sport);
255}
256
257static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
258 __be32 dst, __be32 src, u32 tos,
259 int oif, u8 protocol,
260 __be16 sport, __be16 dport,
261 struct sock *sk)
262{
263 struct net *net = sock_net(sk);
264 struct rtable *rt;
265
266 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
267 sport, dport, sk);
268
269 if (!dst || !src) {
270 rt = __ip_route_output_key(net, fl4);
271 if (IS_ERR(rt))
272 return rt;
273 ip_rt_put(rt);
274 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
275 }
276 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
277 return ip_route_output_flow(net, fl4, sk);
278}
279
280static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
281 __be16 orig_sport, __be16 orig_dport,
282 __be16 sport, __be16 dport,
283 struct sock *sk)
284{
285 if (sport != orig_sport || dport != orig_dport) {
286 fl4->fl4_dport = dport;
287 fl4->fl4_sport = sport;
288 ip_rt_put(rt);
289 flowi4_update_output(fl4, sk->sk_bound_dev_if,
290 RT_CONN_FLAGS(sk), fl4->daddr,
291 fl4->saddr);
292 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
293 return ip_route_output_flow(sock_net(sk), fl4, sk);
294 }
295 return rt;
296}
297
298static inline int inet_iif(const struct sk_buff *skb)
299{
300 int iif = skb_rtable(skb)->rt_iif;
301
302 if (iif)
303 return iif;
304 return skb->skb_iif;
305}
306
307extern int sysctl_ip_default_ttl;
308
309static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
310{
311 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
312
313 if (hoplimit == 0)
314 hoplimit = sysctl_ip_default_ttl;
315 return hoplimit;
316}
317
318#endif
319