12874c5fdSThomas Gleixner /* SPDX-License-Identifier: GPL-2.0-or-later */ 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * INET An implementation of the TCP/IP protocol suite for the LINUX 41da177e4SLinus Torvalds * operating system. INET is implemented using the BSD Socket 51da177e4SLinus Torvalds * interface as the means of communication with the user level. 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * Definitions for the IP router. 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * Version: @(#)route.h 1.0.4 05/27/93 101da177e4SLinus Torvalds * 1102c30a84SJesper Juhl * Authors: Ross Biro 121da177e4SLinus Torvalds * Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG> 131da177e4SLinus Torvalds * Fixes: 141da177e4SLinus Torvalds * Alan Cox : Reformatted. Added ip_rt_local() 151da177e4SLinus Torvalds * Alan Cox : Support for TCP parameters. 161da177e4SLinus Torvalds * Alexey Kuznetsov: Major changes for new routing code. 171da177e4SLinus Torvalds * Mike McLagan : Routing by source 181da177e4SLinus Torvalds * Robert Olsson : Added rt_cache statistics 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds #ifndef _ROUTE_H 211da177e4SLinus Torvalds #define _ROUTE_H 221da177e4SLinus Torvalds 231da177e4SLinus Torvalds #include <net/dst.h> 241da177e4SLinus Torvalds #include <net/inetpeer.h> 251da177e4SLinus Torvalds #include <net/flow.h> 2679876874SKOVACS Krisztian #include <net/inet_sock.h> 2779a13159SPeter Nørlund #include <net/ip_fib.h> 285c9f7c1dSDavid Ahern #include <net/arp.h> 295c9f7c1dSDavid Ahern #include <net/ndisc.h> 301da177e4SLinus Torvalds #include <linux/in_route.h> 311da177e4SLinus Torvalds #include <linux/rtnetlink.h> 32c6cffba4SDavid S. Miller #include <linux/rcupdate.h> 331da177e4SLinus Torvalds #include <linux/route.h> 341da177e4SLinus Torvalds #include <linux/ip.h> 351da177e4SLinus Torvalds #include <linux/cache.h> 36beb8d13bSVenkat Yekkirala #include <linux/security.h> 371da177e4SLinus Torvalds 38f87c10a8SHannes Frederic Sowa /* IPv4 datagram length is stored into 16bit field (tot_len) */ 39f87c10a8SHannes Frederic Sowa #define IP_MAX_MTU 0xFFFFU 40f87c10a8SHannes Frederic Sowa 411da177e4SLinus Torvalds #define RTO_ONLINK 0x01 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE)) 44aa661581SFrancesco Fusco #define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE)) 451da177e4SLinus Torvalds 4667e1e2f4SGuillaume Nault static inline __u8 ip_sock_rt_scope(const struct sock *sk) 4767e1e2f4SGuillaume Nault { 4867e1e2f4SGuillaume Nault if (sock_flag(sk, SOCK_LOCALROUTE)) 4967e1e2f4SGuillaume Nault return RT_SCOPE_LINK; 5067e1e2f4SGuillaume Nault 5167e1e2f4SGuillaume Nault return RT_SCOPE_UNIVERSE; 5267e1e2f4SGuillaume Nault } 5367e1e2f4SGuillaume Nault 5467e1e2f4SGuillaume Nault static inline __u8 ip_sock_rt_tos(const struct sock *sk) 5567e1e2f4SGuillaume Nault { 5667e1e2f4SGuillaume Nault return RT_TOS(inet_sk(sk)->tos); 5767e1e2f4SGuillaume Nault } 5867e1e2f4SGuillaume Nault 59b6459415SJakub Kicinski struct ip_tunnel_info; 601da177e4SLinus Torvalds struct fib_nh; 6162fa8a84SDavid S. Miller struct fib_info; 625055c371SEric Dumazet struct uncached_list; 63fd2c3ef7SEric Dumazet struct rtable { 641da177e4SLinus Torvalds struct dst_entry dst; 651da177e4SLinus Torvalds 6629e75252SEric Dumazet int rt_genid; 6795c96174SEric Dumazet unsigned int rt_flags; 681da177e4SLinus Torvalds __u16 rt_type; 69155e8336SJulian Anastasov __u8 rt_is_input; 7077d5bc7eSDavid Ahern __u8 rt_uses_gateway; 711da177e4SLinus Torvalds 721da177e4SLinus Torvalds int rt_iif; 731da177e4SLinus Torvalds 7477d5bc7eSDavid Ahern u8 rt_gw_family; 751da177e4SLinus Torvalds /* Info on neighbour */ 760f5f7d7bSDavid Ahern union { 771550c171SDavid Ahern __be32 rt_gw4; 780f5f7d7bSDavid Ahern struct in6_addr rt_gw6; 790f5f7d7bSDavid Ahern }; 801da177e4SLinus Torvalds 811da177e4SLinus Torvalds /* Miscellaneous cached information */ 82d52e5a7eSSabrina Dubroca u32 rt_mtu_locked:1, 83d52e5a7eSSabrina Dubroca rt_pmtu:31; 84caacf05eSDavid S. Miller 85caacf05eSDavid S. Miller struct list_head rt_uncached; 865055c371SEric Dumazet struct uncached_list *rt_uncached_list; 871da177e4SLinus Torvalds }; 881da177e4SLinus Torvalds 89b8400f37SSteffen Klassert static inline bool rt_is_input_route(const struct rtable *rt) 90c7537967SDavid S. Miller { 919917e1e8SDavid S. Miller return rt->rt_is_input != 0; 92c7537967SDavid S. Miller } 93c7537967SDavid S. Miller 94b8400f37SSteffen Klassert static inline bool rt_is_output_route(const struct rtable *rt) 95c7537967SDavid S. Miller { 969917e1e8SDavid S. Miller return rt->rt_is_input == 0; 97c7537967SDavid S. Miller } 98c7537967SDavid S. Miller 99f8126f1dSDavid S. Miller static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr) 100f8126f1dSDavid S. Miller { 1011550c171SDavid Ahern if (rt->rt_gw_family == AF_INET) 1021550c171SDavid Ahern return rt->rt_gw4; 103f8126f1dSDavid S. Miller return daddr; 104f8126f1dSDavid S. Miller } 105f8126f1dSDavid S. Miller 106fd2c3ef7SEric Dumazet struct ip_rt_acct { 1071da177e4SLinus Torvalds __u32 o_bytes; 1081da177e4SLinus Torvalds __u32 o_packets; 1091da177e4SLinus Torvalds __u32 i_bytes; 1101da177e4SLinus Torvalds __u32 i_packets; 1111da177e4SLinus Torvalds }; 1121da177e4SLinus Torvalds 113fd2c3ef7SEric Dumazet struct rt_cache_stat { 1141da177e4SLinus Torvalds unsigned int in_slow_tot; 1151da177e4SLinus Torvalds unsigned int in_slow_mc; 1161da177e4SLinus Torvalds unsigned int in_no_route; 1171da177e4SLinus Torvalds unsigned int in_brd; 1181da177e4SLinus Torvalds unsigned int in_martian_dst; 1191da177e4SLinus Torvalds unsigned int in_martian_src; 1201da177e4SLinus Torvalds unsigned int out_slow_tot; 1211da177e4SLinus Torvalds unsigned int out_slow_mc; 1221da177e4SLinus Torvalds }; 1231da177e4SLinus Torvalds 1247d720c3eSTejun Heo extern struct ip_rt_acct __percpu *ip_rt_acct; 1251da177e4SLinus Torvalds 1261da177e4SLinus Torvalds struct in_device; 1272702c4bbSJoe Perches 1282702c4bbSJoe Perches int ip_rt_init(void); 1292702c4bbSJoe Perches void rt_cache_flush(struct net *net); 1302702c4bbSJoe Perches void rt_flush_dev(struct net_device *dev); 1313abd1adeSDavid Ahern struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp, 1323abd1adeSDavid Ahern const struct sk_buff *skb); 1333abd1adeSDavid Ahern struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp, 1343abd1adeSDavid Ahern struct fib_result *res, 135bf4e0a3dSNikolay Aleksandrov const struct sk_buff *skb); 13679a13159SPeter Nørlund 13779a13159SPeter Nørlund static inline struct rtable *__ip_route_output_key(struct net *net, 13879a13159SPeter Nørlund struct flowi4 *flp) 13979a13159SPeter Nørlund { 1403abd1adeSDavid Ahern return ip_route_output_key_hash(net, flp, NULL); 14179a13159SPeter Nørlund } 14279a13159SPeter Nørlund 1432702c4bbSJoe Perches struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp, 1446f9c9615SEric Dumazet const struct sock *sk); 145571912c6SMartin Varghese struct rtable *ip_route_output_tunnel(struct sk_buff *skb, 146571912c6SMartin Varghese struct net_device *dev, 147571912c6SMartin Varghese struct net *net, __be32 *saddr, 148571912c6SMartin Varghese const struct ip_tunnel_info *info, 149571912c6SMartin Varghese u8 protocol, bool use_cache); 150571912c6SMartin Varghese 1512702c4bbSJoe Perches struct dst_entry *ipv4_blackhole_route(struct net *net, 1522702c4bbSJoe Perches struct dst_entry *dst_orig); 153407eadd9SEric Dumazet 1549d6ec938SDavid S. Miller static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp) 1555bfa787fSDavid S. Miller { 1565bfa787fSDavid S. Miller return ip_route_output_flow(net, flp, NULL); 1575bfa787fSDavid S. Miller } 1585bfa787fSDavid S. Miller 15978fbfd8aSDavid S. Miller static inline struct rtable *ip_route_output(struct net *net, __be32 daddr, 16078fbfd8aSDavid S. Miller __be32 saddr, u8 tos, int oif) 16178fbfd8aSDavid S. Miller { 1629d6ec938SDavid S. Miller struct flowi4 fl4 = { 1639d6ec938SDavid S. Miller .flowi4_oif = oif, 164c5d21c4bSRoland Dreier .flowi4_tos = tos, 1659d6ec938SDavid S. Miller .daddr = daddr, 1669d6ec938SDavid S. Miller .saddr = saddr, 16778fbfd8aSDavid S. Miller }; 1689d6ec938SDavid S. Miller return ip_route_output_key(net, &fl4); 16978fbfd8aSDavid S. Miller } 17078fbfd8aSDavid S. Miller 17131e4543dSDavid S. Miller static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4, 17231e4543dSDavid S. Miller struct sock *sk, 17378fbfd8aSDavid S. Miller __be32 daddr, __be32 saddr, 17478fbfd8aSDavid S. Miller __be16 dport, __be16 sport, 17578fbfd8aSDavid S. Miller __u8 proto, __u8 tos, int oif) 17678fbfd8aSDavid S. Miller { 17731e4543dSDavid S. Miller flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos, 17894b92b88SDavid S. Miller RT_SCOPE_UNIVERSE, proto, 17994b92b88SDavid S. Miller sk ? inet_sk_flowi_flags(sk) : 0, 180e2d118a1SLorenzo Colitti daddr, saddr, dport, sport, sock_net_uid(net, sk)); 18178fbfd8aSDavid S. Miller if (sk) 1823df98d79SPaul Moore security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); 18331e4543dSDavid S. Miller return ip_route_output_flow(net, fl4, sk); 18478fbfd8aSDavid S. Miller } 18578fbfd8aSDavid S. Miller 186cbb1e85fSDavid S. Miller static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4, 18778fbfd8aSDavid S. Miller __be32 daddr, __be32 saddr, 18878fbfd8aSDavid S. Miller __be32 gre_key, __u8 tos, int oif) 18978fbfd8aSDavid S. Miller { 190cbb1e85fSDavid S. Miller memset(fl4, 0, sizeof(*fl4)); 191cbb1e85fSDavid S. Miller fl4->flowi4_oif = oif; 192cbb1e85fSDavid S. Miller fl4->daddr = daddr; 193cbb1e85fSDavid S. Miller fl4->saddr = saddr; 194cbb1e85fSDavid S. Miller fl4->flowi4_tos = tos; 195cbb1e85fSDavid S. Miller fl4->flowi4_proto = IPPROTO_GRE; 196cbb1e85fSDavid S. Miller fl4->fl4_gre_key = gre_key; 197cbb1e85fSDavid S. Miller return ip_route_output_key(net, fl4); 19878fbfd8aSDavid S. Miller } 199bc044e8dSPaolo Abeni int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr, 200bc044e8dSPaolo Abeni u8 tos, struct net_device *dev, 201bc044e8dSPaolo Abeni struct in_device *in_dev, u32 *itag); 2022702c4bbSJoe Perches int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src, 20338a424e4SDavid Miller u8 tos, struct net_device *devin); 2045510cdf7SDavid Ahern int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src, 2055510cdf7SDavid Ahern u8 tos, struct net_device *devin, 2065510cdf7SDavid Ahern struct fib_result *res); 207407eadd9SEric Dumazet 20802b24941SPaolo Abeni int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src, 20902b24941SPaolo Abeni u8 tos, struct net_device *devin, 21002b24941SPaolo Abeni const struct sk_buff *hint); 21102b24941SPaolo Abeni 212c6cffba4SDavid S. Miller static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src, 213c6cffba4SDavid S. Miller u8 tos, struct net_device *devin) 214c6cffba4SDavid S. Miller { 215c6cffba4SDavid S. Miller int err; 216c6cffba4SDavid S. Miller 217c6cffba4SDavid S. Miller rcu_read_lock(); 218c6cffba4SDavid S. Miller err = ip_route_input_noref(skb, dst, src, tos, devin); 21964327fc8SStefano Brivio if (!err) { 220222d7dbdSEric Dumazet skb_dst_force(skb); 2219df16efaSWei Wang if (!skb_dst(skb)) 2229df16efaSWei Wang err = -EINVAL; 22364327fc8SStefano Brivio } 224c6cffba4SDavid S. Miller rcu_read_unlock(); 225c6cffba4SDavid S. Miller 226c6cffba4SDavid S. Miller return err; 227c6cffba4SDavid S. Miller } 228c6cffba4SDavid S. Miller 2292702c4bbSJoe Perches void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif, 230d888f396SMaciej Żenczykowski u8 protocol); 2312702c4bbSJoe Perches void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu); 2321042caa7SMaciej Żenczykowski void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol); 2332702c4bbSJoe Perches void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk); 2342702c4bbSJoe Perches void ip_rt_send_redirect(struct sk_buff *skb); 2351da177e4SLinus Torvalds 2362702c4bbSJoe Perches unsigned int inet_addr_type(struct net *net, __be32 addr); 2379b8ff518SDavid Ahern unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id); 2382702c4bbSJoe Perches unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, 2392702c4bbSJoe Perches __be32 addr); 24030bbaa19SDavid Ahern unsigned int inet_addr_type_dev_table(struct net *net, 24130bbaa19SDavid Ahern const struct net_device *dev, 24230bbaa19SDavid Ahern __be32 addr); 2432702c4bbSJoe Perches void ip_rt_multicast_event(struct in_device *); 244ca25c300SAl Viro int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt); 2452702c4bbSJoe Perches void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt); 2469ab179d8SDavid Ahern struct rtable *rt_dst_alloc(struct net_device *dev, 2479ab179d8SDavid Ahern unsigned int flags, u16 type, 248af13b3c3SDavid Laight bool nopolicy, bool noxfrm); 2495b18f128SStephen Suryaputra struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt); 2501da177e4SLinus Torvalds 2510ff60a45SJamal Hadi Salim struct in_ifaddr; 2522702c4bbSJoe Perches void fib_add_ifaddr(struct in_ifaddr *); 2532702c4bbSJoe Perches void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *); 254af4d768aSDavid Ahern void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric); 2550ff60a45SJamal Hadi Salim 256510c321bSXin Long void rt_add_uncached_list(struct rtable *rt); 257510c321bSXin Long void rt_del_uncached_list(struct rtable *rt); 258510c321bSXin Long 259ee28906fSStefano Brivio int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb, 260ee28906fSStefano Brivio u32 table_id, struct fib_info *fi, 261e93fb3e9SJohn Fastabend int *fa_index, int fa_start, unsigned int flags); 262ee28906fSStefano Brivio 2631da177e4SLinus Torvalds static inline void ip_rt_put(struct rtable *rt) 2641da177e4SLinus Torvalds { 2656da025faSEric Dumazet /* dst_release() accepts a NULL parameter. 2666da025faSEric Dumazet * We rely on dst being first structure in struct rtable 2676da025faSEric Dumazet */ 2686da025faSEric Dumazet BUILD_BUG_ON(offsetof(struct rtable, dst) != 0); 269d8d1f30bSChangli Gao dst_release(&rt->dst); 2701da177e4SLinus Torvalds } 2711da177e4SLinus Torvalds 2721da177e4SLinus Torvalds #define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3) 2731da177e4SLinus Torvalds 2744839c52bSPhilippe De Muyter extern const __u8 ip_tos2prio[16]; 2751da177e4SLinus Torvalds 2761da177e4SLinus Torvalds static inline char rt_tos2priority(u8 tos) 2771da177e4SLinus Torvalds { 2781da177e4SLinus Torvalds return ip_tos2prio[IPTOS_TOS(tos)>>1]; 2791da177e4SLinus Torvalds } 2801da177e4SLinus Torvalds 2812d7192d6SDavid S. Miller /* ip_route_connect() and ip_route_newports() work in tandem whilst 2822d7192d6SDavid S. Miller * binding a socket for a new outgoing connection. 2832d7192d6SDavid S. Miller * 2842d7192d6SDavid S. Miller * In order to use IPSEC properly, we must, in the end, have a 2852d7192d6SDavid S. Miller * route that was looked up using all available keys including source 2862d7192d6SDavid S. Miller * and destination ports. 2872d7192d6SDavid S. Miller * 2882d7192d6SDavid S. Miller * However, if a source port needs to be allocated (the user specified 2892d7192d6SDavid S. Miller * a wildcard source port) we need to obtain addressing information 2902d7192d6SDavid S. Miller * in order to perform that allocation. 2912d7192d6SDavid S. Miller * 2922d7192d6SDavid S. Miller * So ip_route_connect() looks up a route using wildcarded source and 2932d7192d6SDavid S. Miller * destination ports in the key, simply so that we can get a pair of 2942d7192d6SDavid S. Miller * addresses to use for port allocation. 2952d7192d6SDavid S. Miller * 2962d7192d6SDavid S. Miller * Later, once the ports are allocated, ip_route_newports() will make 2972d7192d6SDavid S. Miller * another route lookup if needed to make sure we catch any IPSEC 2982d7192d6SDavid S. Miller * rules keyed on the port information. 2992d7192d6SDavid S. Miller * 3002d7192d6SDavid S. Miller * The callers allocate the flow key on their stack, and must pass in 3012d7192d6SDavid S. Miller * the same flowi4 object to both the ip_route_connect() and the 3022d7192d6SDavid S. Miller * ip_route_newports() calls. 3032d7192d6SDavid S. Miller */ 3042d7192d6SDavid S. Miller 30567e1e2f4SGuillaume Nault static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, 30667e1e2f4SGuillaume Nault __be32 src, int oif, u8 protocol, 307b23dd4feSDavid S. Miller __be16 sport, __be16 dport, 30867e1e2f4SGuillaume Nault const struct sock *sk) 3091da177e4SLinus Torvalds { 3102d7192d6SDavid S. Miller __u8 flow_flags = 0; 31179876874SKOVACS Krisztian 31279876874SKOVACS Krisztian if (inet_sk(sk)->transparent) 31394b92b88SDavid S. Miller flow_flags |= FLOWI_FLAG_ANYSRC; 31494b92b88SDavid S. Miller 31567e1e2f4SGuillaume Nault flowi4_init_output(fl4, oif, sk->sk_mark, ip_sock_rt_tos(sk), 31667e1e2f4SGuillaume Nault ip_sock_rt_scope(sk), protocol, flow_flags, dst, 31767e1e2f4SGuillaume Nault src, dport, sport, sk->sk_uid); 3182d7192d6SDavid S. Miller } 3192d7192d6SDavid S. Miller 32067e1e2f4SGuillaume Nault static inline struct rtable *ip_route_connect(struct flowi4 *fl4, __be32 dst, 32167e1e2f4SGuillaume Nault __be32 src, int oif, u8 protocol, 3222d7192d6SDavid S. Miller __be16 sport, __be16 dport, 3230e0d44abSSteffen Klassert struct sock *sk) 3242d7192d6SDavid S. Miller { 3252d7192d6SDavid S. Miller struct net *net = sock_net(sk); 3262d7192d6SDavid S. Miller struct rtable *rt; 3272d7192d6SDavid S. Miller 32867e1e2f4SGuillaume Nault ip_route_connect_init(fl4, dst, src, oif, protocol, sport, dport, sk); 32979876874SKOVACS Krisztian 3301da177e4SLinus Torvalds if (!dst || !src) { 3312d7192d6SDavid S. Miller rt = __ip_route_output_key(net, fl4); 332b23dd4feSDavid S. Miller if (IS_ERR(rt)) 333b23dd4feSDavid S. Miller return rt; 334b23dd4feSDavid S. Miller ip_rt_put(rt); 33567e1e2f4SGuillaume Nault flowi4_update_output(fl4, oif, fl4->flowi4_tos, fl4->daddr, 33667e1e2f4SGuillaume Nault fl4->saddr); 3371da177e4SLinus Torvalds } 3383df98d79SPaul Moore security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); 3392d7192d6SDavid S. Miller return ip_route_output_flow(net, fl4, sk); 3401da177e4SLinus Torvalds } 3411da177e4SLinus Torvalds 3422d7192d6SDavid S. Miller static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt, 3432d7192d6SDavid S. Miller __be16 orig_sport, __be16 orig_dport, 3442d7192d6SDavid S. Miller __be16 sport, __be16 dport, 3452d7192d6SDavid S. Miller struct sock *sk) 3461da177e4SLinus Torvalds { 347dca8b089SDavid S. Miller if (sport != orig_sport || dport != orig_dport) { 3482d7192d6SDavid S. Miller fl4->fl4_dport = dport; 3492d7192d6SDavid S. Miller fl4->fl4_sport = sport; 350b23dd4feSDavid S. Miller ip_rt_put(rt); 351e6b45241SJulian Anastasov flowi4_update_output(fl4, sk->sk_bound_dev_if, 352e6b45241SJulian Anastasov RT_CONN_FLAGS(sk), fl4->daddr, 353e6b45241SJulian Anastasov fl4->saddr); 3543df98d79SPaul Moore security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4)); 3552d7192d6SDavid S. Miller return ip_route_output_flow(sock_net(sk), fl4, sk); 3561da177e4SLinus Torvalds } 357b23dd4feSDavid S. Miller return rt; 3581da177e4SLinus Torvalds } 3591da177e4SLinus Torvalds 3601668e010SKOVACS Krisztian static inline int inet_iif(const struct sk_buff *skb) 3611668e010SKOVACS Krisztian { 3620340d0b9STom Herbert struct rtable *rt = skb_rtable(skb); 36313378cadSDavid S. Miller 3640340d0b9STom Herbert if (rt && rt->rt_iif) 3650340d0b9STom Herbert return rt->rt_iif; 3660340d0b9STom Herbert 36713378cadSDavid S. Miller return skb->skb_iif; 3681668e010SKOVACS Krisztian } 3691668e010SKOVACS Krisztian 370323e126fSDavid S. Miller static inline int ip4_dst_hoplimit(const struct dst_entry *dst) 371323e126fSDavid S. Miller { 372323e126fSDavid S. Miller int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT); 373fa50d974SNikolay Borisov struct net *net = dev_net(dst->dev); 374323e126fSDavid S. Miller 375323e126fSDavid S. Miller if (hoplimit == 0) 376*8281b7ecSKuniyuki Iwashima hoplimit = READ_ONCE(net->ipv4.sysctl_ip_default_ttl); 377323e126fSDavid S. Miller return hoplimit; 378323e126fSDavid S. Miller } 379323e126fSDavid S. Miller 3805c9f7c1dSDavid Ahern static inline struct neighbour *ip_neigh_gw4(struct net_device *dev, 3815c9f7c1dSDavid Ahern __be32 daddr) 3825c9f7c1dSDavid Ahern { 3835c9f7c1dSDavid Ahern struct neighbour *neigh; 3845c9f7c1dSDavid Ahern 3853c42b201SEric Dumazet neigh = __ipv4_neigh_lookup_noref(dev, (__force u32)daddr); 3865c9f7c1dSDavid Ahern if (unlikely(!neigh)) 3875c9f7c1dSDavid Ahern neigh = __neigh_create(&arp_tbl, &daddr, dev, false); 3885c9f7c1dSDavid Ahern 3895c9f7c1dSDavid Ahern return neigh; 3905c9f7c1dSDavid Ahern } 3915c9f7c1dSDavid Ahern 3925c9f7c1dSDavid Ahern static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt, 3935c9f7c1dSDavid Ahern struct sk_buff *skb, 3945c9f7c1dSDavid Ahern bool *is_v6gw) 3955c9f7c1dSDavid Ahern { 3965c9f7c1dSDavid Ahern struct net_device *dev = rt->dst.dev; 3975c9f7c1dSDavid Ahern struct neighbour *neigh; 3985c9f7c1dSDavid Ahern 3995c9f7c1dSDavid Ahern if (likely(rt->rt_gw_family == AF_INET)) { 4005c9f7c1dSDavid Ahern neigh = ip_neigh_gw4(dev, rt->rt_gw4); 4015c9f7c1dSDavid Ahern } else if (rt->rt_gw_family == AF_INET6) { 4025c9f7c1dSDavid Ahern neigh = ip_neigh_gw6(dev, &rt->rt_gw6); 4035c9f7c1dSDavid Ahern *is_v6gw = true; 4045c9f7c1dSDavid Ahern } else { 4055c9f7c1dSDavid Ahern neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr); 4065c9f7c1dSDavid Ahern } 4075c9f7c1dSDavid Ahern return neigh; 4085c9f7c1dSDavid Ahern } 4095c9f7c1dSDavid Ahern 4101da177e4SLinus Torvalds #endif /* _ROUTE_H */ 411