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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 <linux/in_route.h>
32#include <linux/rtnetlink.h>
33#include <linux/route.h>
34#include <linux/ip.h>
35#include <linux/cache.h>
36#include <linux/security.h>
37
38#define RTO_ONLINK 0x01
39
40#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
41
42struct fib_nh;
43struct inet_peer;
44struct fib_info;
45struct rtable {
46 struct dst_entry dst;
47
48 /* Lookup key. */
49 __be32 rt_key_dst;
50 __be32 rt_key_src;
51
52 int rt_genid;
53 unsigned rt_flags;
54 __u16 rt_type;
55 __u8 rt_key_tos;
56
57 __be32 rt_dst; /* Path destination */
58 __be32 rt_src; /* Path source */
59 int rt_route_iif;
60 int rt_iif;
61 int rt_oif;
62 __u32 rt_mark;
63
64 /* Info on neighbour */
65 __be32 rt_gateway;
66
67 /* Miscellaneous cached information */
68 __be32 rt_spec_dst; /* RFC1122 specific destination */
69 u32 rt_peer_genid;
70 struct inet_peer *peer; /* long-living peer info */
71 struct fib_info *fi; /* for client ref to shared metrics */
72};
73
74static inline bool rt_is_input_route(struct rtable *rt)
75{
76 return rt->rt_route_iif != 0;
77}
78
79static inline bool rt_is_output_route(struct rtable *rt)
80{
81 return rt->rt_route_iif == 0;
82}
83
84struct ip_rt_acct {
85 __u32 o_bytes;
86 __u32 o_packets;
87 __u32 i_bytes;
88 __u32 i_packets;
89};
90
91struct rt_cache_stat {
92 unsigned int in_hit;
93 unsigned int in_slow_tot;
94 unsigned int in_slow_mc;
95 unsigned int in_no_route;
96 unsigned int in_brd;
97 unsigned int in_martian_dst;
98 unsigned int in_martian_src;
99 unsigned int out_hit;
100 unsigned int out_slow_tot;
101 unsigned int out_slow_mc;
102 unsigned int gc_total;
103 unsigned int gc_ignored;
104 unsigned int gc_goal_miss;
105 unsigned int gc_dst_overflow;
106 unsigned int in_hlist_search;
107 unsigned int out_hlist_search;
108};
109
110extern struct ip_rt_acct __percpu *ip_rt_acct;
111
112struct in_device;
113extern int ip_rt_init(void);
114extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
115 __be32 src, struct net_device *dev);
116extern void rt_cache_flush(struct net *net, int how);
117extern void rt_cache_flush_batch(struct net *net);
118extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);
119extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
120 struct sock *sk);
121extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);
122
123static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
124{
125 return ip_route_output_flow(net, flp, NULL);
126}
127
128static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
129 __be32 saddr, u8 tos, int oif)
130{
131 struct flowi4 fl4 = {
132 .flowi4_oif = oif,
133 .daddr = daddr,
134 .saddr = saddr,
135 .flowi4_tos = tos,
136 };
137 return ip_route_output_key(net, &fl4);
138}
139
140static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
141 struct sock *sk,
142 __be32 daddr, __be32 saddr,
143 __be16 dport, __be16 sport,
144 __u8 proto, __u8 tos, int oif)
145{
146 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
147 RT_SCOPE_UNIVERSE, proto,
148 sk ? inet_sk_flowi_flags(sk) : 0,
149 daddr, saddr, dport, sport);
150 if (sk)
151 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
152 return ip_route_output_flow(net, fl4, sk);
153}
154
155static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
156 __be32 daddr, __be32 saddr,
157 __be32 gre_key, __u8 tos, int oif)
158{
159 memset(fl4, 0, sizeof(*fl4));
160 fl4->flowi4_oif = oif;
161 fl4->daddr = daddr;
162 fl4->saddr = saddr;
163 fl4->flowi4_tos = tos;
164 fl4->flowi4_proto = IPPROTO_GRE;
165 fl4->fl4_gre_key = gre_key;
166 return ip_route_output_key(net, fl4);
167}
168
169extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
170 u8 tos, struct net_device *devin, bool noref);
171
172static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
173 u8 tos, struct net_device *devin)
174{
175 return ip_route_input_common(skb, dst, src, tos, devin, false);
176}
177
178static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
179 u8 tos, struct net_device *devin)
180{
181 return ip_route_input_common(skb, dst, src, tos, devin, true);
182}
183
184extern unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
185 unsigned short new_mtu, struct net_device *dev);
186extern void ip_rt_send_redirect(struct sk_buff *skb);
187
188extern unsigned inet_addr_type(struct net *net, __be32 addr);
189extern unsigned inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
190extern void ip_rt_multicast_event(struct in_device *);
191extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
192extern void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
193extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
194
195struct in_ifaddr;
196extern void fib_add_ifaddr(struct in_ifaddr *);
197extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
198
199static inline void ip_rt_put(struct rtable * rt)
200{
201 if (rt)
202 dst_release(&rt->dst);
203}
204
205#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
206
207extern const __u8 ip_tos2prio[16];
208
209static inline char rt_tos2priority(u8 tos)
210{
211 return ip_tos2prio[IPTOS_TOS(tos)>>1];
212}
213
214/* ip_route_connect() and ip_route_newports() work in tandem whilst
215 * binding a socket for a new outgoing connection.
216 *
217 * In order to use IPSEC properly, we must, in the end, have a
218 * route that was looked up using all available keys including source
219 * and destination ports.
220 *
221 * However, if a source port needs to be allocated (the user specified
222 * a wildcard source port) we need to obtain addressing information
223 * in order to perform that allocation.
224 *
225 * So ip_route_connect() looks up a route using wildcarded source and
226 * destination ports in the key, simply so that we can get a pair of
227 * addresses to use for port allocation.
228 *
229 * Later, once the ports are allocated, ip_route_newports() will make
230 * another route lookup if needed to make sure we catch any IPSEC
231 * rules keyed on the port information.
232 *
233 * The callers allocate the flow key on their stack, and must pass in
234 * the same flowi4 object to both the ip_route_connect() and the
235 * ip_route_newports() calls.
236 */
237
238static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
239 u32 tos, int oif, u8 protocol,
240 __be16 sport, __be16 dport,
241 struct sock *sk, bool can_sleep)
242{
243 __u8 flow_flags = 0;
244
245 if (inet_sk(sk)->transparent)
246 flow_flags |= FLOWI_FLAG_ANYSRC;
247 if (protocol == IPPROTO_TCP)
248 flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
249 if (can_sleep)
250 flow_flags |= FLOWI_FLAG_CAN_SLEEP;
251
252 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
253 protocol, flow_flags, dst, src, dport, sport);
254}
255
256static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
257 __be32 dst, __be32 src, u32 tos,
258 int oif, u8 protocol,
259 __be16 sport, __be16 dport,
260 struct sock *sk, bool can_sleep)
261{
262 struct net *net = sock_net(sk);
263 struct rtable *rt;
264
265 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
266 sport, dport, sk, can_sleep);
267
268 if (!dst || !src) {
269 rt = __ip_route_output_key(net, fl4);
270 if (IS_ERR(rt))
271 return rt;
272 ip_rt_put(rt);
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 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
288 return ip_route_output_flow(sock_net(sk), fl4, sk);
289 }
290 return rt;
291}
292
293extern void rt_bind_peer(struct rtable *rt, __be32 daddr, int create);
294
295static inline struct inet_peer *rt_get_peer(struct rtable *rt, __be32 daddr)
296{
297 if (rt->peer)
298 return rt->peer;
299
300 rt_bind_peer(rt, daddr, 0);
301 return rt->peer;
302}
303
304static inline int inet_iif(const struct sk_buff *skb)
305{
306 return skb_rtable(skb)->rt_iif;
307}
308
309extern int sysctl_ip_default_ttl;
310
311static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
312{
313 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
314
315 if (hoplimit == 0)
316 hoplimit = sysctl_ip_default_ttl;
317 return hoplimit;
318}
319
320#endif /* _ROUTE_H */
1/* SPDX-License-Identifier: GPL-2.0-or-later */
2/*
3 * INET An implementation of the TCP/IP protocol suite for the LINUX
4 * operating system. INET is implemented using the BSD Socket
5 * interface as the means of communication with the user level.
6 *
7 * Definitions for the IP router.
8 *
9 * Version: @(#)route.h 1.0.4 05/27/93
10 *
11 * Authors: Ross Biro
12 * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
13 * Fixes:
14 * Alan Cox : Reformatted. Added ip_rt_local()
15 * Alan Cox : Support for TCP parameters.
16 * Alexey Kuznetsov: Major changes for new routing code.
17 * Mike McLagan : Routing by source
18 * Robert Olsson : Added rt_cache statistics
19 */
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/* IPv4 datagram length is stored into 16bit field (tot_len) */
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 /* Info on neighbour */
62 union {
63 __be32 rt_gw4;
64 struct in6_addr rt_gw6;
65 };
66
67 /* Miscellaneous cached information */
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 rtable *ip_route_output_tunnel(struct sk_buff *skb,
132 struct net_device *dev,
133 struct net *net, __be32 *saddr,
134 const struct ip_tunnel_info *info,
135 u8 protocol, bool use_cache);
136
137struct dst_entry *ipv4_blackhole_route(struct net *net,
138 struct dst_entry *dst_orig);
139
140static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
141{
142 return ip_route_output_flow(net, flp, NULL);
143}
144
145static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
146 __be32 saddr, u8 tos, int oif)
147{
148 struct flowi4 fl4 = {
149 .flowi4_oif = oif,
150 .flowi4_tos = tos,
151 .daddr = daddr,
152 .saddr = saddr,
153 };
154 return ip_route_output_key(net, &fl4);
155}
156
157static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
158 struct sock *sk,
159 __be32 daddr, __be32 saddr,
160 __be16 dport, __be16 sport,
161 __u8 proto, __u8 tos, int oif)
162{
163 flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
164 RT_SCOPE_UNIVERSE, proto,
165 sk ? inet_sk_flowi_flags(sk) : 0,
166 daddr, saddr, dport, sport, sock_net_uid(net, sk));
167 if (sk)
168 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
169 return ip_route_output_flow(net, fl4, sk);
170}
171
172static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
173 __be32 daddr, __be32 saddr,
174 __be32 gre_key, __u8 tos, int oif)
175{
176 memset(fl4, 0, sizeof(*fl4));
177 fl4->flowi4_oif = oif;
178 fl4->daddr = daddr;
179 fl4->saddr = saddr;
180 fl4->flowi4_tos = tos;
181 fl4->flowi4_proto = IPPROTO_GRE;
182 fl4->fl4_gre_key = gre_key;
183 return ip_route_output_key(net, fl4);
184}
185int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
186 u8 tos, struct net_device *dev,
187 struct in_device *in_dev, u32 *itag);
188int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
189 u8 tos, struct net_device *devin);
190int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
191 u8 tos, struct net_device *devin,
192 struct fib_result *res);
193
194int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
195 u8 tos, struct net_device *devin,
196 const struct sk_buff *hint);
197
198static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
199 u8 tos, struct net_device *devin)
200{
201 int err;
202
203 rcu_read_lock();
204 err = ip_route_input_noref(skb, dst, src, tos, devin);
205 if (!err) {
206 skb_dst_force(skb);
207 if (!skb_dst(skb))
208 err = -EINVAL;
209 }
210 rcu_read_unlock();
211
212 return err;
213}
214
215void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
216 u8 protocol);
217void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
218void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
219void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
220void ip_rt_send_redirect(struct sk_buff *skb);
221
222unsigned int inet_addr_type(struct net *net, __be32 addr);
223unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
224unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
225 __be32 addr);
226unsigned int inet_addr_type_dev_table(struct net *net,
227 const struct net_device *dev,
228 __be32 addr);
229void ip_rt_multicast_event(struct in_device *);
230int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
231void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
232struct rtable *rt_dst_alloc(struct net_device *dev,
233 unsigned int flags, u16 type,
234 bool nopolicy, bool noxfrm);
235struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
236
237struct in_ifaddr;
238void fib_add_ifaddr(struct in_ifaddr *);
239void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
240void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
241
242void rt_add_uncached_list(struct rtable *rt);
243void rt_del_uncached_list(struct rtable *rt);
244
245int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
246 u32 table_id, struct fib_info *fi,
247 int *fa_index, int fa_start, unsigned int flags);
248
249static inline void ip_rt_put(struct rtable *rt)
250{
251 /* dst_release() accepts a NULL parameter.
252 * We rely on dst being first structure in struct rtable
253 */
254 BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
255 dst_release(&rt->dst);
256}
257
258#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
259
260extern const __u8 ip_tos2prio[16];
261
262static inline char rt_tos2priority(u8 tos)
263{
264 return ip_tos2prio[IPTOS_TOS(tos)>>1];
265}
266
267/* ip_route_connect() and ip_route_newports() work in tandem whilst
268 * binding a socket for a new outgoing connection.
269 *
270 * In order to use IPSEC properly, we must, in the end, have a
271 * route that was looked up using all available keys including source
272 * and destination ports.
273 *
274 * However, if a source port needs to be allocated (the user specified
275 * a wildcard source port) we need to obtain addressing information
276 * in order to perform that allocation.
277 *
278 * So ip_route_connect() looks up a route using wildcarded source and
279 * destination ports in the key, simply so that we can get a pair of
280 * addresses to use for port allocation.
281 *
282 * Later, once the ports are allocated, ip_route_newports() will make
283 * another route lookup if needed to make sure we catch any IPSEC
284 * rules keyed on the port information.
285 *
286 * The callers allocate the flow key on their stack, and must pass in
287 * the same flowi4 object to both the ip_route_connect() and the
288 * ip_route_newports() calls.
289 */
290
291static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
292 u32 tos, int oif, u8 protocol,
293 __be16 sport, __be16 dport,
294 struct sock *sk)
295{
296 __u8 flow_flags = 0;
297
298 if (inet_sk(sk)->transparent)
299 flow_flags |= FLOWI_FLAG_ANYSRC;
300
301 flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
302 protocol, flow_flags, dst, src, dport, sport,
303 sk->sk_uid);
304}
305
306static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
307 __be32 dst, __be32 src, u32 tos,
308 int oif, u8 protocol,
309 __be16 sport, __be16 dport,
310 struct sock *sk)
311{
312 struct net *net = sock_net(sk);
313 struct rtable *rt;
314
315 ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
316 sport, dport, sk);
317
318 if (!dst || !src) {
319 rt = __ip_route_output_key(net, fl4);
320 if (IS_ERR(rt))
321 return rt;
322 ip_rt_put(rt);
323 flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
324 }
325 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
326 return ip_route_output_flow(net, fl4, sk);
327}
328
329static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
330 __be16 orig_sport, __be16 orig_dport,
331 __be16 sport, __be16 dport,
332 struct sock *sk)
333{
334 if (sport != orig_sport || dport != orig_dport) {
335 fl4->fl4_dport = dport;
336 fl4->fl4_sport = sport;
337 ip_rt_put(rt);
338 flowi4_update_output(fl4, sk->sk_bound_dev_if,
339 RT_CONN_FLAGS(sk), fl4->daddr,
340 fl4->saddr);
341 security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
342 return ip_route_output_flow(sock_net(sk), fl4, sk);
343 }
344 return rt;
345}
346
347static inline int inet_iif(const struct sk_buff *skb)
348{
349 struct rtable *rt = skb_rtable(skb);
350
351 if (rt && rt->rt_iif)
352 return rt->rt_iif;
353
354 return skb->skb_iif;
355}
356
357static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
358{
359 int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
360 struct net *net = dev_net(dst->dev);
361
362 if (hoplimit == 0)
363 hoplimit = net->ipv4.sysctl_ip_default_ttl;
364 return hoplimit;
365}
366
367static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
368 __be32 daddr)
369{
370 struct neighbour *neigh;
371
372 neigh = __ipv4_neigh_lookup_noref(dev, daddr);
373 if (unlikely(!neigh))
374 neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
375
376 return neigh;
377}
378
379static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
380 struct sk_buff *skb,
381 bool *is_v6gw)
382{
383 struct net_device *dev = rt->dst.dev;
384 struct neighbour *neigh;
385
386 if (likely(rt->rt_gw_family == AF_INET)) {
387 neigh = ip_neigh_gw4(dev, rt->rt_gw4);
388 } else if (rt->rt_gw_family == AF_INET6) {
389 neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
390 *is_v6gw = true;
391 } else {
392 neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
393 }
394 return neigh;
395}
396
397#endif /* _ROUTE_H */