398 строки
11 KiB
C
398 строки
11 KiB
C
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
|
/*
|
|
* INET An implementation of the TCP/IP protocol suite for the LINUX
|
|
* operating system. INET is implemented using the BSD Socket
|
|
* interface as the means of communication with the user level.
|
|
*
|
|
* Definitions for the IP router.
|
|
*
|
|
* Version: @(#)route.h 1.0.4 05/27/93
|
|
*
|
|
* Authors: Ross Biro
|
|
* Fred N. van Kempen, <waltje@uWalt.NL.Mugnet.ORG>
|
|
* Fixes:
|
|
* Alan Cox : Reformatted. Added ip_rt_local()
|
|
* Alan Cox : Support for TCP parameters.
|
|
* Alexey Kuznetsov: Major changes for new routing code.
|
|
* Mike McLagan : Routing by source
|
|
* Robert Olsson : Added rt_cache statistics
|
|
*/
|
|
#ifndef _ROUTE_H
|
|
#define _ROUTE_H
|
|
|
|
#include <net/dst.h>
|
|
#include <net/inetpeer.h>
|
|
#include <net/flow.h>
|
|
#include <net/inet_sock.h>
|
|
#include <net/ip_fib.h>
|
|
#include <net/arp.h>
|
|
#include <net/ndisc.h>
|
|
#include <linux/in_route.h>
|
|
#include <linux/rtnetlink.h>
|
|
#include <linux/rcupdate.h>
|
|
#include <linux/route.h>
|
|
#include <linux/ip.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/security.h>
|
|
|
|
/* IPv4 datagram length is stored into 16bit field (tot_len) */
|
|
#define IP_MAX_MTU 0xFFFFU
|
|
|
|
#define RTO_ONLINK 0x01
|
|
|
|
#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
|
|
#define RT_CONN_FLAGS_TOS(sk,tos) (RT_TOS(tos) | sock_flag(sk, SOCK_LOCALROUTE))
|
|
|
|
struct fib_nh;
|
|
struct fib_info;
|
|
struct uncached_list;
|
|
struct rtable {
|
|
struct dst_entry dst;
|
|
|
|
int rt_genid;
|
|
unsigned int rt_flags;
|
|
__u16 rt_type;
|
|
__u8 rt_is_input;
|
|
__u8 rt_uses_gateway;
|
|
|
|
int rt_iif;
|
|
|
|
u8 rt_gw_family;
|
|
/* Info on neighbour */
|
|
union {
|
|
__be32 rt_gw4;
|
|
struct in6_addr rt_gw6;
|
|
};
|
|
|
|
/* Miscellaneous cached information */
|
|
u32 rt_mtu_locked:1,
|
|
rt_pmtu:31;
|
|
|
|
struct list_head rt_uncached;
|
|
struct uncached_list *rt_uncached_list;
|
|
};
|
|
|
|
static inline bool rt_is_input_route(const struct rtable *rt)
|
|
{
|
|
return rt->rt_is_input != 0;
|
|
}
|
|
|
|
static inline bool rt_is_output_route(const struct rtable *rt)
|
|
{
|
|
return rt->rt_is_input == 0;
|
|
}
|
|
|
|
static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
|
|
{
|
|
if (rt->rt_gw_family == AF_INET)
|
|
return rt->rt_gw4;
|
|
return daddr;
|
|
}
|
|
|
|
struct ip_rt_acct {
|
|
__u32 o_bytes;
|
|
__u32 o_packets;
|
|
__u32 i_bytes;
|
|
__u32 i_packets;
|
|
};
|
|
|
|
struct rt_cache_stat {
|
|
unsigned int in_slow_tot;
|
|
unsigned int in_slow_mc;
|
|
unsigned int in_no_route;
|
|
unsigned int in_brd;
|
|
unsigned int in_martian_dst;
|
|
unsigned int in_martian_src;
|
|
unsigned int out_slow_tot;
|
|
unsigned int out_slow_mc;
|
|
};
|
|
|
|
extern struct ip_rt_acct __percpu *ip_rt_acct;
|
|
|
|
struct in_device;
|
|
|
|
int ip_rt_init(void);
|
|
void rt_cache_flush(struct net *net);
|
|
void rt_flush_dev(struct net_device *dev);
|
|
struct rtable *ip_route_output_key_hash(struct net *net, struct flowi4 *flp,
|
|
const struct sk_buff *skb);
|
|
struct rtable *ip_route_output_key_hash_rcu(struct net *net, struct flowi4 *flp,
|
|
struct fib_result *res,
|
|
const struct sk_buff *skb);
|
|
|
|
static inline struct rtable *__ip_route_output_key(struct net *net,
|
|
struct flowi4 *flp)
|
|
{
|
|
return ip_route_output_key_hash(net, flp, NULL);
|
|
}
|
|
|
|
struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
|
|
const struct sock *sk);
|
|
struct rtable *ip_route_output_tunnel(struct sk_buff *skb,
|
|
struct net_device *dev,
|
|
struct net *net, __be32 *saddr,
|
|
const struct ip_tunnel_info *info,
|
|
u8 protocol, bool use_cache);
|
|
|
|
struct dst_entry *ipv4_blackhole_route(struct net *net,
|
|
struct dst_entry *dst_orig);
|
|
|
|
static inline struct rtable *ip_route_output_key(struct net *net, struct flowi4 *flp)
|
|
{
|
|
return ip_route_output_flow(net, flp, NULL);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
|
|
__be32 saddr, u8 tos, int oif)
|
|
{
|
|
struct flowi4 fl4 = {
|
|
.flowi4_oif = oif,
|
|
.flowi4_tos = tos,
|
|
.daddr = daddr,
|
|
.saddr = saddr,
|
|
};
|
|
return ip_route_output_key(net, &fl4);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_output_ports(struct net *net, struct flowi4 *fl4,
|
|
struct sock *sk,
|
|
__be32 daddr, __be32 saddr,
|
|
__be16 dport, __be16 sport,
|
|
__u8 proto, __u8 tos, int oif)
|
|
{
|
|
flowi4_init_output(fl4, oif, sk ? sk->sk_mark : 0, tos,
|
|
RT_SCOPE_UNIVERSE, proto,
|
|
sk ? inet_sk_flowi_flags(sk) : 0,
|
|
daddr, saddr, dport, sport, sock_net_uid(net, sk));
|
|
if (sk)
|
|
security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
|
|
return ip_route_output_flow(net, fl4, sk);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4 *fl4,
|
|
__be32 daddr, __be32 saddr,
|
|
__be32 gre_key, __u8 tos, int oif)
|
|
{
|
|
memset(fl4, 0, sizeof(*fl4));
|
|
fl4->flowi4_oif = oif;
|
|
fl4->daddr = daddr;
|
|
fl4->saddr = saddr;
|
|
fl4->flowi4_tos = tos;
|
|
fl4->flowi4_proto = IPPROTO_GRE;
|
|
fl4->fl4_gre_key = gre_key;
|
|
return ip_route_output_key(net, fl4);
|
|
}
|
|
int ip_mc_validate_source(struct sk_buff *skb, __be32 daddr, __be32 saddr,
|
|
u8 tos, struct net_device *dev,
|
|
struct in_device *in_dev, u32 *itag);
|
|
int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
|
|
u8 tos, struct net_device *devin);
|
|
int ip_route_input_rcu(struct sk_buff *skb, __be32 dst, __be32 src,
|
|
u8 tos, struct net_device *devin,
|
|
struct fib_result *res);
|
|
|
|
int ip_route_use_hint(struct sk_buff *skb, __be32 dst, __be32 src,
|
|
u8 tos, struct net_device *devin,
|
|
const struct sk_buff *hint);
|
|
|
|
static inline int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
|
|
u8 tos, struct net_device *devin)
|
|
{
|
|
int err;
|
|
|
|
rcu_read_lock();
|
|
err = ip_route_input_noref(skb, dst, src, tos, devin);
|
|
if (!err) {
|
|
skb_dst_force(skb);
|
|
if (!skb_dst(skb))
|
|
err = -EINVAL;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
return err;
|
|
}
|
|
|
|
void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu, int oif,
|
|
u8 protocol);
|
|
void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
|
|
void ipv4_redirect(struct sk_buff *skb, struct net *net, int oif, u8 protocol);
|
|
void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
|
|
void ip_rt_send_redirect(struct sk_buff *skb);
|
|
|
|
unsigned int inet_addr_type(struct net *net, __be32 addr);
|
|
unsigned int inet_addr_type_table(struct net *net, __be32 addr, u32 tb_id);
|
|
unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev,
|
|
__be32 addr);
|
|
unsigned int inet_addr_type_dev_table(struct net *net,
|
|
const struct net_device *dev,
|
|
__be32 addr);
|
|
void ip_rt_multicast_event(struct in_device *);
|
|
int ip_rt_ioctl(struct net *, unsigned int cmd, struct rtentry *rt);
|
|
void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
|
|
struct rtable *rt_dst_alloc(struct net_device *dev,
|
|
unsigned int flags, u16 type,
|
|
bool nopolicy, bool noxfrm);
|
|
struct rtable *rt_dst_clone(struct net_device *dev, struct rtable *rt);
|
|
|
|
struct in_ifaddr;
|
|
void fib_add_ifaddr(struct in_ifaddr *);
|
|
void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
|
|
void fib_modify_prefix_metric(struct in_ifaddr *ifa, u32 new_metric);
|
|
|
|
void rt_add_uncached_list(struct rtable *rt);
|
|
void rt_del_uncached_list(struct rtable *rt);
|
|
|
|
int fib_dump_info_fnhe(struct sk_buff *skb, struct netlink_callback *cb,
|
|
u32 table_id, struct fib_info *fi,
|
|
int *fa_index, int fa_start, unsigned int flags);
|
|
|
|
static inline void ip_rt_put(struct rtable *rt)
|
|
{
|
|
/* dst_release() accepts a NULL parameter.
|
|
* We rely on dst being first structure in struct rtable
|
|
*/
|
|
BUILD_BUG_ON(offsetof(struct rtable, dst) != 0);
|
|
dst_release(&rt->dst);
|
|
}
|
|
|
|
#define IPTOS_RT_MASK (IPTOS_TOS_MASK & ~3)
|
|
|
|
extern const __u8 ip_tos2prio[16];
|
|
|
|
static inline char rt_tos2priority(u8 tos)
|
|
{
|
|
return ip_tos2prio[IPTOS_TOS(tos)>>1];
|
|
}
|
|
|
|
/* ip_route_connect() and ip_route_newports() work in tandem whilst
|
|
* binding a socket for a new outgoing connection.
|
|
*
|
|
* In order to use IPSEC properly, we must, in the end, have a
|
|
* route that was looked up using all available keys including source
|
|
* and destination ports.
|
|
*
|
|
* However, if a source port needs to be allocated (the user specified
|
|
* a wildcard source port) we need to obtain addressing information
|
|
* in order to perform that allocation.
|
|
*
|
|
* So ip_route_connect() looks up a route using wildcarded source and
|
|
* destination ports in the key, simply so that we can get a pair of
|
|
* addresses to use for port allocation.
|
|
*
|
|
* Later, once the ports are allocated, ip_route_newports() will make
|
|
* another route lookup if needed to make sure we catch any IPSEC
|
|
* rules keyed on the port information.
|
|
*
|
|
* The callers allocate the flow key on their stack, and must pass in
|
|
* the same flowi4 object to both the ip_route_connect() and the
|
|
* ip_route_newports() calls.
|
|
*/
|
|
|
|
static inline void ip_route_connect_init(struct flowi4 *fl4, __be32 dst, __be32 src,
|
|
u32 tos, int oif, u8 protocol,
|
|
__be16 sport, __be16 dport,
|
|
struct sock *sk)
|
|
{
|
|
__u8 flow_flags = 0;
|
|
|
|
if (inet_sk(sk)->transparent)
|
|
flow_flags |= FLOWI_FLAG_ANYSRC;
|
|
|
|
flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
|
|
protocol, flow_flags, dst, src, dport, sport,
|
|
sk->sk_uid);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_connect(struct flowi4 *fl4,
|
|
__be32 dst, __be32 src, u32 tos,
|
|
int oif, u8 protocol,
|
|
__be16 sport, __be16 dport,
|
|
struct sock *sk)
|
|
{
|
|
struct net *net = sock_net(sk);
|
|
struct rtable *rt;
|
|
|
|
ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
|
|
sport, dport, sk);
|
|
|
|
if (!dst || !src) {
|
|
rt = __ip_route_output_key(net, fl4);
|
|
if (IS_ERR(rt))
|
|
return rt;
|
|
ip_rt_put(rt);
|
|
flowi4_update_output(fl4, oif, tos, fl4->daddr, fl4->saddr);
|
|
}
|
|
security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
|
|
return ip_route_output_flow(net, fl4, sk);
|
|
}
|
|
|
|
static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable *rt,
|
|
__be16 orig_sport, __be16 orig_dport,
|
|
__be16 sport, __be16 dport,
|
|
struct sock *sk)
|
|
{
|
|
if (sport != orig_sport || dport != orig_dport) {
|
|
fl4->fl4_dport = dport;
|
|
fl4->fl4_sport = sport;
|
|
ip_rt_put(rt);
|
|
flowi4_update_output(fl4, sk->sk_bound_dev_if,
|
|
RT_CONN_FLAGS(sk), fl4->daddr,
|
|
fl4->saddr);
|
|
security_sk_classify_flow(sk, flowi4_to_flowi_common(fl4));
|
|
return ip_route_output_flow(sock_net(sk), fl4, sk);
|
|
}
|
|
return rt;
|
|
}
|
|
|
|
static inline int inet_iif(const struct sk_buff *skb)
|
|
{
|
|
struct rtable *rt = skb_rtable(skb);
|
|
|
|
if (rt && rt->rt_iif)
|
|
return rt->rt_iif;
|
|
|
|
return skb->skb_iif;
|
|
}
|
|
|
|
static inline int ip4_dst_hoplimit(const struct dst_entry *dst)
|
|
{
|
|
int hoplimit = dst_metric_raw(dst, RTAX_HOPLIMIT);
|
|
struct net *net = dev_net(dst->dev);
|
|
|
|
if (hoplimit == 0)
|
|
hoplimit = net->ipv4.sysctl_ip_default_ttl;
|
|
return hoplimit;
|
|
}
|
|
|
|
static inline struct neighbour *ip_neigh_gw4(struct net_device *dev,
|
|
__be32 daddr)
|
|
{
|
|
struct neighbour *neigh;
|
|
|
|
neigh = __ipv4_neigh_lookup_noref(dev, daddr);
|
|
if (unlikely(!neigh))
|
|
neigh = __neigh_create(&arp_tbl, &daddr, dev, false);
|
|
|
|
return neigh;
|
|
}
|
|
|
|
static inline struct neighbour *ip_neigh_for_gw(struct rtable *rt,
|
|
struct sk_buff *skb,
|
|
bool *is_v6gw)
|
|
{
|
|
struct net_device *dev = rt->dst.dev;
|
|
struct neighbour *neigh;
|
|
|
|
if (likely(rt->rt_gw_family == AF_INET)) {
|
|
neigh = ip_neigh_gw4(dev, rt->rt_gw4);
|
|
} else if (rt->rt_gw_family == AF_INET6) {
|
|
neigh = ip_neigh_gw6(dev, &rt->rt_gw6);
|
|
*is_v6gw = true;
|
|
} else {
|
|
neigh = ip_neigh_gw4(dev, ip_hdr(skb)->daddr);
|
|
}
|
|
return neigh;
|
|
}
|
|
|
|
#endif /* _ROUTE_H */
|