Orange Pi5 kernel

^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   1) /* SPDX-License-Identifier: GPL-2.0-or-later */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   3)  * INET		An implementation of the TCP/IP protocol suite for the LINUX
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   4)  *		operating system.  INET  is implemented using the  BSD Socket
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   5)  *		interface as the means of communication with the user level.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   6)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   7)  *		Definitions for the IP router.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   8)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300   9)  * Version:	@(#)route.h	1.0.4	05/27/93
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  10)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  11)  * Authors:	Ross Biro
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  12)  *		Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  13)  * Fixes:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  14)  *		Alan Cox	:	Reformatted. Added ip_rt_local()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  15)  *		Alan Cox	:	Support for TCP parameters.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  16)  *		Alexey Kuznetsov:	Major changes for new routing code.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  17)  *		Mike McLagan    :	Routing by source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  18)  *		Robert Olsson   :	Added rt_cache statistics
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  19)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  20) #ifndef _ROUTE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  21) #define _ROUTE_H
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  22) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  23) #include <net/dst.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  24) #include <net/inetpeer.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  25) #include <net/flow.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  26) #include <net/inet_sock.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  27) #include <net/ip_fib.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  28) #include <net/arp.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  29) #include <net/ndisc.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  30) #include <linux/in_route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  31) #include <linux/rtnetlink.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  32) #include <linux/rcupdate.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  33) #include <linux/route.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  34) #include <linux/ip.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  35) #include <linux/cache.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  36) #include <linux/security.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  37) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  38) /* IPv4 datagram length is stored into 16bit field (tot_len) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  39) #define IP_MAX_MTU	0xFFFFU
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  40) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  41) #define RTO_ONLINK	0x01
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  42) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  43) #define RT_CONN_FLAGS(sk)   (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  44) #define RT_CONN_FLAGS_TOS(sk,tos)   (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  45) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  46) struct fib_nh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  47) struct fib_info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  48) struct uncached_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  49) struct rtable {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  50) 	struct dst_entry	dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  51) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  52) 	int			rt_genid;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  53) 	unsigned int		rt_flags;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  54) 	__u16			rt_type;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  55) 	__u8			rt_is_input;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  56) 	__u8			rt_uses_gateway;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  57) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  58) 	int			rt_iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  59) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  60) 	u8			rt_gw_family;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  61) 	/* Info on neighbour */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  62) 	union {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  63) 		__be32		rt_gw4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  64) 		struct in6_addr	rt_gw6;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  65) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  66) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  67) 	/* Miscellaneous cached information */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  68) 	u32			rt_mtu_locked:1,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  69) 				rt_pmtu:31;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  70) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  71) 	struct list_head	rt_uncached;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  72) 	struct uncached_list	*rt_uncached_list;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  73) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  74) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  75) static inline bool rt_is_input_route(const struct rtable *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  76) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  77) 	return rt->rt_is_input != 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  79) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  80) static inline bool rt_is_output_route(const struct rtable *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  81) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  82) 	return rt->rt_is_input == 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  83) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  84) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  85) static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  86) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  87) 	if (rt->rt_gw_family == AF_INET)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  88) 		return rt->rt_gw4;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  89) 	return daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  90) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  91) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  92) struct ip_rt_acct {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  93) 	__u32 	o_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  94) 	__u32 	o_packets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  95) 	__u32 	i_bytes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  96) 	__u32 	i_packets;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  97) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  98) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300  99) struct rt_cache_stat {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)         unsigned int in_slow_tot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101)         unsigned int in_slow_mc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102)         unsigned int in_no_route;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103)         unsigned int in_brd;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104)         unsigned int in_martian_dst;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105)         unsigned int in_martian_src;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106)         unsigned int out_slow_tot;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107)         unsigned int out_slow_mc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) extern struct ip_rt_acct __percpu *ip_rt_acct;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) struct in_device;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) int ip_rt_init(void);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) void rt_cache_flush(struct net *net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) void rt_flush_dev(struct net_device *dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118) 					const struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) 					    struct fib_result *res,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) 					    const struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) static inline struct rtable *__ip_route_output_key(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) 						   struct flowi4 *flp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) 	return ip_route_output_key_hash(net, flp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129) struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) 				    const struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) 				      struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) 				      struct net *net, __be32 *saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) 				      const struct ip_tunnel_info *info,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135) 				      u8 protocol, bool use_cache);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) struct dst_entry *ipv4_blackhole_route(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) 				       struct dst_entry *dst_orig);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) 	return ip_route_output_flow(net, flp, NULL);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) 					     __be32 saddr, u8 tos, int oif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) 	struct flowi4 fl4 = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) 		.flowi4_oif = oif,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) 		.flowi4_tos = tos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) 		.daddr = daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152) 		.saddr = saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) 	};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) 	return ip_route_output_key(net, &fl4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) 						   struct sock *sk,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) 						   __be32 daddr, __be32 saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160) 						   __be16 dport, __be16 sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) 						   __u8 proto, __u8 tos, int oif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) 	flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) 			   RT_SCOPE_UNIVERSE, proto,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) 			   sk ? inet_sk_flowi_flags(sk) : 0,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) 			   daddr, saddr, dport, sport, sock_net_uid(net, sk));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167) 	if (sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) 		security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) 	return ip_route_output_flow(net, fl4, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) 						 __be32 daddr, __be32 saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174) 						 __be32 gre_key, __u8 tos, int oif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) 	memset(fl4, 0, sizeof(*fl4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) 	fl4->flowi4_oif = oif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178) 	fl4->daddr = daddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) 	fl4->saddr = saddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) 	fl4->flowi4_tos = tos;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) 	fl4->flowi4_proto = IPPROTO_GRE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) 	fl4->fl4_gre_key = gre_key;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) 	return ip_route_output_key(net, fl4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185) int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) 			  u8 tos, struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) 			  struct in_device *in_dev, u32 *itag);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) 			 u8 tos, struct net_device *devin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) 		       u8 tos, struct net_device *devin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) 		       struct fib_result *res);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) 		      u8 tos, struct net_device *devin,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) 		      const struct sk_buff *hint);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) 				 u8 tos, struct net_device *devin)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) 	int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) 	rcu_read_lock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) 	err = ip_route_input_noref(skb, dst, src, tos, devin);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) 	if (!err) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) 		skb_dst_force(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) 		if (!skb_dst(skb))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) 			err = -EINVAL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) 	rcu_read_unlock();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212) 	return err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215) void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) 		      u8 protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220) void ip_rt_send_redirect(struct sk_buff *skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) unsigned int inet_addr_type(struct net *net, __be32 addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) 				__be32 addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) unsigned int inet_addr_type_dev_table(struct net *net,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) 				      const struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) 				      __be32 addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) void ip_rt_multicast_event(struct in_device *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) struct rtable *rt_dst_alloc(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) 			     unsigned int flags, u16 type,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) 			     bool nopolicy, bool noxfrm);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) struct in_ifaddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) void fib_add_ifaddr(struct in_ifaddr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) void rt_add_uncached_list(struct rtable *rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) void rt_del_uncached_list(struct rtable *rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) 		       u32 table_id, struct fib_info *fi,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) 		       int *fa_index, int fa_start, unsigned int flags);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) static inline void ip_rt_put(struct rtable *rt)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) 	/* dst_release() accepts a NULL parameter.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) 	 * We rely on dst being first structure in struct rtable
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) 	 */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) 	BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) 	dst_release(&rt->dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) #define IPTOS_RT_MASK	(IPTOS_TOS_MASK & ~3)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) extern const __u8 ip_tos2prio[16];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) static inline char rt_tos2priority(u8 tos)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) 	return ip_tos2prio[IPTOS_TOS(tos)>>1];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) /* ip_route_connect() and ip_route_newports() work in tandem whilst
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268)  * binding a socket for a new outgoing connection.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270)  * In order to use IPSEC properly, we must, in the end, have a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)  * route that was looked up using all available keys including source
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272)  * and destination ports.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274)  * However, if a source port needs to be allocated (the user specified
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275)  * a wildcard source port) we need to obtain addressing information
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276)  * in order to perform that allocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278)  * So ip_route_connect() looks up a route using wildcarded source and
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279)  * destination ports in the key, simply so that we can get a pair of
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280)  * addresses to use for port allocation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)  * Later, once the ports are allocated, ip_route_newports() will make
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283)  * another route lookup if needed to make sure we catch any IPSEC
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284)  * rules keyed on the port information.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285)  *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286)  * The callers allocate the flow key on their stack, and must pass in
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287)  * the same flowi4 object to both the ip_route_connect() and the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288)  * ip_route_newports() calls.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289)  */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) 					 u32 tos, int oif, u8 protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) 					 __be16 sport, __be16 dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) 					 struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) 	__u8 flow_flags = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) 	if (inet_sk(sk)->transparent)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299) 		flow_flags |= FLOWI_FLAG_ANYSRC;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) 	flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) 			   protocol, flow_flags, dst, src, dport, sport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) 			   sk->sk_uid);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) 					      __be32 dst, __be32 src, u32 tos,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) 					      int oif, u8 protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) 					      __be16 sport, __be16 dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) 					      struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) 	struct net *net = sock_net(sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313) 	struct rtable *rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) 	ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) 			      sport, dport, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) 	if (!dst || !src) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) 		rt = __ip_route_output_key(net, fl4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) 		if (IS_ERR(rt))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) 			return rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) 		ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) 		flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) 	security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326) 	return ip_route_output_flow(net, fl4, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) 					       __be16 orig_sport, __be16 orig_dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) 					       __be16 sport, __be16 dport,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) 					       struct sock *sk)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) 	if (sport != orig_sport || dport != orig_dport) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) 		fl4->fl4_dport = dport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336) 		fl4->fl4_sport = sport;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) 		ip_rt_put(rt);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) 		flowi4_update_output(fl4, sk->sk_bound_dev_if,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) 				     RT_CONN_FLAGS(sk), fl4->daddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) 				     fl4->saddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) 		security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) 		return ip_route_output_flow(sock_net(sk), fl4, sk);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) 	return rt;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) static inline int inet_iif(const struct sk_buff *skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) 	struct rtable *rt = skb_rtable(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351) 	if (rt && rt->rt_iif)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) 		return rt->rt_iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) 	return skb->skb_iif;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) 	int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) 	struct net *net = dev_net(dst->dev);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) 	if (hoplimit == 0)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) 		hoplimit = net->ipv4.sysctl_ip_default_ttl;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) 	return hoplimit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) 					     __be32 daddr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) 	struct neighbour *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) 	neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) 	if (unlikely(!neigh))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) 		neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) 	return neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380) 						struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) 						bool *is_v6gw)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) 	struct net_device *dev = rt->dst.dev;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) 	struct neighbour *neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) 	if (likely(rt->rt_gw_family == AF_INET)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) 		neigh = ip_neigh_gw4(dev, rt->rt_gw4);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) 	} else if (rt->rt_gw_family == AF_INET6) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) 		neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) 		*is_v6gw = true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391) 	} else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) 		neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) 	}
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) 	return neigh;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) 
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) #endif	/* _ROUTE_H */