summaryrefslogtreecommitdiffstats
path: root/include/net/route.h
diff options
context:
space:
mode:
Diffstat (limited to '')
-rw-r--r--include/net/route.h351
1 files changed, 351 insertions, 0 deletions
diff --git a/include/net/route.h b/include/net/route.h
new file mode 100644
index 000000000..bb53cdba3
--- /dev/null
+++ b/include/net/route.h
@@ -0,0 +1,351 @@
+/*
+ * 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
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+#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 <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;
+
+ /* Info on neighbour */
+ __be32 rt_gateway;
+
+ /* 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_gateway)
+ return rt->rt_gateway;
+ 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 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(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);
+
+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,
+ u32 mark, u8 protocol, int flow_flags);
+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, u32 mark,
+ u8 protocol, int flow_flags);
+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, bool will_cache);
+
+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);
+
+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(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(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;
+}
+
+#endif /* _ROUTE_H */
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-02 23:59:18 +0000