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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 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
61 __be32 rt_gateway;
62
63
64 u32 rt_pmtu;
65
66 struct list_head rt_uncached;
67};
68
69static inline bool rt_is_input_route(const struct rtable *rt)
70{
71 return rt->rt_is_input != 0;
72}
73
74static inline bool rt_is_output_route(const struct rtable *rt)
75{
76 return rt->rt_is_input == 0;
77}
78
79static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
80{
81 if (rt->rt_gateway)
82 return rt->rt_gateway;
83 return daddr;
84}
85
86struct ip_rt_acct {
87 __u32 o_bytes;
88 __u32 o_packets;
89 __u32 i_bytes;
90 __u32 i_packets;
91};
92
93struct rt_cache_stat {
94 unsigned int in_slow_tot;
95 unsigned int in_slow_mc;
96 unsigned int in_no_route;
97 unsigned int in_brd;
98 unsigned int in_martian_dst;
99 unsigned int in_martian_src;
100 unsigned int out_slow_tot;
101 unsigned int out_slow_mc;
102};
103
104extern struct ip_rt_acct __percpu *ip_rt_acct;
105
106struct in_device;
107
108int ip_rt_init(void);
109void rt_cache_flush(struct net *net);
110void rt_flush_dev(struct net_device *dev);
111struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);
112struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
113 struct sock *sk);
114struct dst_entry *ipv4_blackhole_route(struct net *net,
115 struct dst_entry *dst_orig);
116
117static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
118{
119 return ip_route_output_flow(net, flp, NULL);
120}
121
122static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
123 __be32 saddr, u8 tos, int oif)
124{
125 struct flowi4 fl4 = {
126 .flowi4_oif = oif,
127 .flowi4_tos = tos,
128 .daddr = daddr,
129 .saddr = saddr,
130 };
131 return ip_route_output_key(net, &fl4);
132}
133
134static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
135 struct sock *sk,
136 __be32 daddr, __be32 saddr,
137 __be16 dport, __be16 sport,
138 __u8 proto, __u8 tos, int oif)
139{
140 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
141 RT_SCOPE_UNIVERSE, proto,
142 sk ? inet_sk_flowi_flags(sk) : 0,
143 daddr, saddr, dport, sport);
144 if (sk)
145 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
146 return ip_route_output_flow(net, fl4, sk);
147}
148
149static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
150 __be32 daddr, __be32 saddr,
151 __be32 gre_key, __u8 tos, int oif)
152{
153 memset(fl4, 0, sizeof(*fl4));
154 fl4->flowi4_oif = oif;
155 fl4->daddr = daddr;
156 fl4->saddr = saddr;
157 fl4->flowi4_tos = tos;
158 fl4->flowi4_proto = IPPROTO_GRE;
159 fl4->fl4_gre_key = gre_key;
160 return ip_route_output_key(net, fl4);
161}
162
163int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
164 u8 tos, struct net_device *devin);
165
166static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
167 u8 tos, struct net_device *devin)
168{
169 int err;
170
171 rcu_read_lock();
172 err = ip_route_input_noref(skb, dst, src, tos, devin);
173 if (!err)
174 skb_dst_force(skb);
175 rcu_read_unlock();
176
177 return err;
178}
179
180void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
181 u32 mark, u8 protocol, int flow_flags);
182void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
183void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
184 u8 protocol, int flow_flags);
185void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
186void ip_rt_send_redirect(struct sk_buff *skb);
187
188unsigned int inet_addr_type(struct net *net, __be32 addr);
189unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
190 __be32 addr);
191void ip_rt_multicast_event(struct in_device *);
192int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
193void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
194
195struct in_ifaddr;
196void fib_add_ifaddr(struct in_ifaddr *);
197void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
198
199static inline void ip_rt_put(struct rtable *rt)
200{
201
202
203
204 BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
205 dst_release(&rt->dst);
206}
207
208#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
209
210extern const __u8 ip_tos2prio[16];
211
212static inline char rt_tos2priority(u8 tos)
213{
214 return ip_tos2prio[IPTOS_TOS(tos)>>1];
215}
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241static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
242 u32 tos, int oif, u8 protocol,
243 __be16 sport, __be16 dport,
244 struct sock *sk)
245{
246 __u8 flow_flags = 0;
247
248 if (inet_sk(sk)->transparent)
249 flow_flags |= FLOWI_FLAG_ANYSRC;
250
251 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
252 protocol, flow_flags, dst, src, dport, sport);
253}
254
255static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
256 __be32 dst, __be32 src, u32 tos,
257 int oif, u8 protocol,
258 __be16 sport, __be16 dport,
259 struct sock *sk)
260{
261 struct net *net = sock_net(sk);
262 struct rtable *rt;
263
264 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
265 sport, dport, sk);
266
267 if (!dst || !src) {
268 rt = __ip_route_output_key(net, fl4);
269 if (IS_ERR(rt))
270 return rt;
271 ip_rt_put(rt);
272 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
273 }
274 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
275 return ip_route_output_flow(net, fl4, sk);
276}
277
278static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
279 __be16 orig_sport, __be16 orig_dport,
280 __be16 sport, __be16 dport,
281 struct sock *sk)
282{
283 if (sport != orig_sport || dport != orig_dport) {
284 fl4->fl4_dport = dport;
285 fl4->fl4_sport = sport;
286 ip_rt_put(rt);
287 flowi4_update_output(fl4, sk->sk_bound_dev_if,
288 RT_CONN_FLAGS(sk), fl4->daddr,
289 fl4->saddr);
290 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
291 return ip_route_output_flow(sock_net(sk), fl4, sk);
292 }
293 return rt;
294}
295
296static inline int inet_iif(const struct sk_buff *skb)
297{
298 int iif = skb_rtable(skb)->rt_iif;
299
300 if (iif)
301 return iif;
302 return skb->skb_iif;
303}
304
305extern int sysctl_ip_default_ttl;
306
307static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
308{
309 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
310
311 if (hoplimit == 0)
312 hoplimit = sysctl_ip_default_ttl;
313 return hoplimit;
314}
315
316#endif
317