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Linux/include/net/route.h

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  1 /*
  2  * INET         An implementation of the TCP/IP protocol suite for the LINUX
  3  *              operating system.  INET  is implemented using the  BSD Socket
  4  *              interface as the means of communication with the user level.
  5  *
  6  *              Definitions for the IP router.
  7  *
  8  * Version:     @(#)route.h     1.0.4   05/27/93
  9  *
 10  * Authors:     Ross Biro
 11  *              Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
 12  * Fixes:
 13  *              Alan Cox        :       Reformatted. Added ip_rt_local()
 14  *              Alan Cox        :       Support for TCP parameters.
 15  *              Alexey Kuznetsov:       Major changes for new routing code.
 16  *              Mike McLagan    :       Routing by source
 17  *              Robert Olsson   :       Added rt_cache statistics
 18  *
 19  *              This program is free software; you can redistribute it and/or
 20  *              modify it under the terms of the GNU General Public License
 21  *              as published by the Free Software Foundation; either version
 22  *              2 of the License, or (at your option) any later version.
 23  */
 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 <net/ip_fib.h>
 32 #include <linux/in_route.h>
 33 #include <linux/rtnetlink.h>
 34 #include <linux/rcupdate.h>
 35 #include <linux/route.h>
 36 #include <linux/ip.h>
 37 #include <linux/cache.h>
 38 #include <linux/security.h>
 39 
 40 /* IPv4 datagram length is stored into 16bit field (tot_len) */
 41 #define IP_MAX_MTU      0xFFFFU
 42 
 43 #define RTO_ONLINK      0x01
 44 
 45 #define RT_CONN_FLAGS(sk)   (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
 46 #define RT_CONN_FLAGS_TOS(sk,tos)   (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))
 47 
 48 struct fib_nh;
 49 struct fib_info;
 50 struct uncached_list;
 51 struct rtable {
 52         struct dst_entry        dst;
 53 
 54         int                     rt_genid;
 55         unsigned int            rt_flags;
 56         __u16                   rt_type;
 57         __u8                    rt_is_input;
 58         __u8                    rt_uses_gateway;
 59 
 60         int                     rt_iif;
 61 
 62         /* Info on neighbour */
 63         __be32                  rt_gateway;
 64 
 65         /* Miscellaneous cached information */
 66         u32                     rt_mtu_locked:1,
 67                                 rt_pmtu:31;
 68 
 69         struct list_head        rt_uncached;
 70         struct uncached_list    *rt_uncached_list;
 71 };
 72 
 73 static inline bool rt_is_input_route(const struct rtable *rt)
 74 {
 75         return rt->rt_is_input != 0;
 76 }
 77 
 78 static inline bool rt_is_output_route(const struct rtable *rt)
 79 {
 80         return rt->rt_is_input == 0;
 81 }
 82 
 83 static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
 84 {
 85         if (rt->rt_gateway)
 86                 return rt->rt_gateway;
 87         return daddr;
 88 }
 89 
 90 struct ip_rt_acct {
 91         __u32   o_bytes;
 92         __u32   o_packets;
 93         __u32   i_bytes;
 94         __u32   i_packets;
 95 };
 96 
 97 struct rt_cache_stat {
 98         unsigned int in_slow_tot;
 99         unsigned int in_slow_mc;
100         unsigned int in_no_route;
101         unsigned int in_brd;
102         unsigned int in_martian_dst;
103         unsigned int in_martian_src;
104         unsigned int out_slow_tot;
105         unsigned int out_slow_mc;
106 };
107 
108 extern struct ip_rt_acct __percpu *ip_rt_acct;
109 
110 struct in_device;
111 
112 int ip_rt_init(void);
113 void rt_cache_flush(struct net *net);
114 void rt_flush_dev(struct net_device *dev);
115 struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
116                                         const struct sk_buff *skb);
117 struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
118                                             struct fib_result *res,
119                                             const struct sk_buff *skb);
120 
121 static inline struct rtable *__ip_route_output_key(struct net *net,
122                                                    struct flowi4 *flp)
123 {
124         return ip_route_output_key_hash(net, flp, NULL);
125 }
126 
127 struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
128                                     const struct sock *sk);
129 struct dst_entry *ipv4_blackhole_route(struct net *net,
130                                        struct dst_entry *dst_orig);
131 
132 static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
133 {
134         return ip_route_output_flow(net, flp, NULL);
135 }
136 
137 static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
138                                              __be32 saddr, u8 tos, int oif)
139 {
140         struct flowi4 fl4 = {
141                 .flowi4_oif = oif,
142                 .flowi4_tos = tos,
143                 .daddr = daddr,
144                 .saddr = saddr,
145         };
146         return ip_route_output_key(net, &fl4);
147 }
148 
149 static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
150                                                    struct sock *sk,
151                                                    __be32 daddr, __be32 saddr,
152                                                    __be16 dport, __be16 sport,
153                                                    __u8 proto, __u8 tos, int oif)
154 {
155         flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
156                            RT_SCOPE_UNIVERSE, proto,
157                            sk ? inet_sk_flowi_flags(sk) : 0,
158                            daddr, saddr, dport, sport, sock_net_uid(net, sk));
159         if (sk)
160                 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
161         return ip_route_output_flow(net, fl4, sk);
162 }
163 
164 static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
165                                                  __be32 daddr, __be32 saddr,
166                                                  __be32 gre_key, __u8 tos, int oif)
167 {
168         memset(fl4, 0, sizeof(*fl4));
169         fl4->flowi4_oif = oif;
170         fl4->daddr = daddr;
171         fl4->saddr = saddr;
172         fl4->flowi4_tos = tos;
173         fl4->flowi4_proto = IPPROTO_GRE;
174         fl4->fl4_gre_key = gre_key;
175         return ip_route_output_key(net, fl4);
176 }
177 int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
178                           u8 tos, struct net_device *dev,
179                           struct in_device *in_dev, u32 *itag);
180 int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
181                          u8 tos, struct net_device *devin);
182 int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
183                        u8 tos, struct net_device *devin,
184                        struct fib_result *res);
185 
186 static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
187                                  u8 tos, struct net_device *devin)
188 {
189         int err;
190 
191         rcu_read_lock();
192         err = ip_route_input_noref(skb, dst, src, tos, devin);
193         if (!err) {
194                 skb_dst_force(skb);
195                 if (!skb_dst(skb))
196                         err = -EINVAL;
197         }
198         rcu_read_unlock();
199 
200         return err;
201 }
202 
203 void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
204                       u32 mark, u8 protocol, int flow_flags);
205 void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
206 void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u32 mark,
207                    u8 protocol, int flow_flags);
208 void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
209 void ip_rt_send_redirect(struct sk_buff *skb);
210 
211 unsigned int inet_addr_type(struct net *net, __be32 addr);
212 unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
213 unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
214                                 __be32 addr);
215 unsigned int inet_addr_type_dev_table(struct net *net,
216                                       const struct net_device *dev,
217                                       __be32 addr);
218 void ip_rt_multicast_event(struct in_device *);
219 int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
220 void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
221 struct rtable *rt_dst_alloc(struct net_device *dev,
222                              unsigned int flags, u16 type,
223                              bool nopolicy, bool noxfrm, bool will_cache);
224 
225 struct in_ifaddr;
226 void fib_add_ifaddr(struct in_ifaddr *);
227 void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
228 void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
229 
230 void rt_add_uncached_list(struct rtable *rt);
231 void rt_del_uncached_list(struct rtable *rt);
232 
233 static inline void ip_rt_put(struct rtable *rt)
234 {
235         /* dst_release() accepts a NULL parameter.
236          * We rely on dst being first structure in struct rtable
237          */
238         BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
239         dst_release(&rt->dst);
240 }
241 
242 #define IPTOS_RT_MASK   (IPTOS_TOS_MASK & ~3)
243 
244 extern const __u8 ip_tos2prio[16];
245 
246 static inline char rt_tos2priority(u8 tos)
247 {
248         return ip_tos2prio[IPTOS_TOS(tos)>>1];
249 }
250 
251 /* ip_route_connect() and ip_route_newports() work in tandem whilst
252  * binding a socket for a new outgoing connection.
253  *
254  * In order to use IPSEC properly, we must, in the end, have a
255  * route that was looked up using all available keys including source
256  * and destination ports.
257  *
258  * However, if a source port needs to be allocated (the user specified
259  * a wildcard source port) we need to obtain addressing information
260  * in order to perform that allocation.
261  *
262  * So ip_route_connect() looks up a route using wildcarded source and
263  * destination ports in the key, simply so that we can get a pair of
264  * addresses to use for port allocation.
265  *
266  * Later, once the ports are allocated, ip_route_newports() will make
267  * another route lookup if needed to make sure we catch any IPSEC
268  * rules keyed on the port information.
269  *
270  * The callers allocate the flow key on their stack, and must pass in
271  * the same flowi4 object to both the ip_route_connect() and the
272  * ip_route_newports() calls.
273  */
274 
275 static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
276                                          u32 tos, int oif, u8 protocol,
277                                          __be16 sport, __be16 dport,
278                                          struct sock *sk)
279 {
280         __u8 flow_flags = 0;
281 
282         if (inet_sk(sk)->transparent)
283                 flow_flags |= FLOWI_FLAG_ANYSRC;
284 
285         flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
286                            protocol, flow_flags, dst, src, dport, sport,
287                            sk->sk_uid);
288 }
289 
290 static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
291                                               __be32 dst, __be32 src, u32 tos,
292                                               int oif, u8 protocol,
293                                               __be16 sport, __be16 dport,
294                                               struct sock *sk)
295 {
296         struct net *net = sock_net(sk);
297         struct rtable *rt;
298 
299         ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
300                               sport, dport, sk);
301 
302         if (!dst || !src) {
303                 rt = __ip_route_output_key(net, fl4);
304                 if (IS_ERR(rt))
305                         return rt;
306                 ip_rt_put(rt);
307                 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
308         }
309         security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
310         return ip_route_output_flow(net, fl4, sk);
311 }
312 
313 static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
314                                                __be16 orig_sport, __be16 orig_dport,
315                                                __be16 sport, __be16 dport,
316                                                struct sock *sk)
317 {
318         if (sport != orig_sport || dport != orig_dport) {
319                 fl4->fl4_dport = dport;
320                 fl4->fl4_sport = sport;
321                 ip_rt_put(rt);
322                 flowi4_update_output(fl4, sk->sk_bound_dev_if,
323                                      RT_CONN_FLAGS(sk), fl4->daddr,
324                                      fl4->saddr);
325                 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
326                 return ip_route_output_flow(sock_net(sk), fl4, sk);
327         }
328         return rt;
329 }
330 
331 static inline int inet_iif(const struct sk_buff *skb)
332 {
333         struct rtable *rt = skb_rtable(skb);
334 
335         if (rt && rt->rt_iif)
336                 return rt->rt_iif;
337 
338         return skb->skb_iif;
339 }
340 
341 static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
342 {
343         int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
344         struct net *net = dev_net(dst->dev);
345 
346         if (hoplimit == 0)
347                 hoplimit = net->ipv4.sysctl_ip_default_ttl;
348         return hoplimit;
349 }
350 
351 #endif  /* _ROUTE_H */
352 

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