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Diffstat (limited to 'include/net/route.h')
-rw-r--r--include/net/route.h110
1 files changed, 65 insertions, 45 deletions
diff --git a/include/net/route.h b/include/net/route.h
index 3c1eeab9749..b17cf28f996 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -30,14 +30,19 @@
#include <net/inet_sock.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;
@@ -47,27 +52,28 @@ struct rtable {
int rt_genid;
unsigned int rt_flags;
__u16 rt_type;
+ __u8 rt_is_input;
+ __u8 rt_uses_gateway;
- int rt_route_iif;
int rt_iif;
- int rt_oif;
/* Info on neighbour */
__be32 rt_gateway;
/* Miscellaneous cached information */
u32 rt_pmtu;
- struct fib_info *fi; /* for client ref to shared metrics */
+
+ struct list_head rt_uncached;
};
static inline bool rt_is_input_route(const struct rtable *rt)
{
- return rt->rt_route_iif != 0;
+ return rt->rt_is_input != 0;
}
static inline bool rt_is_output_route(const struct rtable *rt)
{
- return rt->rt_route_iif == 0;
+ return rt->rt_is_input == 0;
}
static inline __be32 rt_nexthop(const struct rtable *rt, __be32 daddr)
@@ -85,33 +91,28 @@ struct ip_rt_acct {
};
struct rt_cache_stat {
- unsigned int in_hit;
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_hit;
unsigned int out_slow_tot;
unsigned int out_slow_mc;
- unsigned int gc_total;
- unsigned int gc_ignored;
- unsigned int gc_goal_miss;
- unsigned int gc_dst_overflow;
- unsigned int in_hlist_search;
- unsigned int out_hlist_search;
};
extern struct ip_rt_acct __percpu *ip_rt_acct;
struct in_device;
-extern int ip_rt_init(void);
-extern void rt_cache_flush(struct net *net, int how);
-extern struct rtable *__ip_route_output_key(struct net *, struct flowi4 *flp);
-extern struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
- struct sock *sk);
-extern struct dst_entry *ipv4_blackhole_route(struct net *net, struct dst_entry *dst_orig);
+
+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(struct net *, struct flowi4 *flp);
+struct rtable *ip_route_output_flow(struct net *, struct flowi4 *flp,
+ 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)
{
@@ -159,32 +160,49 @@ static inline struct rtable *ip_route_output_gre(struct net *net, struct flowi4
return ip_route_output_key(net, fl4);
}
-extern int ip_route_input(struct sk_buff *skb, __be32 dst, __be32 src,
- u8 tos, struct net_device *devin);
+int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 src,
+ u8 tos, struct net_device *devin);
+
+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);
+ rcu_read_unlock();
-extern void ipv4_update_pmtu(struct sk_buff *skb, struct net *net, u32 mtu,
- int oif, u32 mark, u8 protocol, int flow_flags);
-extern void ipv4_sk_update_pmtu(struct sk_buff *skb, struct sock *sk, u32 mtu);
-extern void ipv4_redirect(struct sk_buff *skb, struct net *net,
- int oif, u32 mark, u8 protocol, int flow_flags);
-extern void ipv4_sk_redirect(struct sk_buff *skb, struct sock *sk);
-extern void ip_rt_send_redirect(struct sk_buff *skb);
+ return err;
+}
-extern unsigned int inet_addr_type(struct net *net, __be32 addr);
-extern unsigned int inet_dev_addr_type(struct net *net, const struct net_device *dev, __be32 addr);
-extern void ip_rt_multicast_event(struct in_device *);
-extern int ip_rt_ioctl(struct net *, unsigned int cmd, void __user *arg);
-extern void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
-extern int ip_rt_dump(struct sk_buff *skb, struct netlink_callback *cb);
+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_dev_addr_type(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, void __user *arg);
+void ip_rt_get_source(u8 *src, struct sk_buff *skb, struct rtable *rt);
struct in_ifaddr;
-extern void fib_add_ifaddr(struct in_ifaddr *);
-extern void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
+void fib_add_ifaddr(struct in_ifaddr *);
+void fib_del_ifaddr(struct in_ifaddr *, struct in_ifaddr *);
-static inline void ip_rt_put(struct rtable * rt)
+static inline void ip_rt_put(struct rtable *rt)
{
- if (rt)
- dst_release(&rt->dst);
+ /* 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)
@@ -223,14 +241,12 @@ static inline char rt_tos2priority(u8 tos)
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, bool can_sleep)
+ struct sock *sk)
{
__u8 flow_flags = 0;
if (inet_sk(sk)->transparent)
flow_flags |= FLOWI_FLAG_ANYSRC;
- if (can_sleep)
- flow_flags |= FLOWI_FLAG_CAN_SLEEP;
flowi4_init_output(fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
protocol, flow_flags, dst, src, dport, sport);
@@ -240,13 +256,13 @@ 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, bool can_sleep)
+ 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, can_sleep);
+ sport, dport, sk);
if (!dst || !src) {
rt = __ip_route_output_key(net, fl4);
@@ -279,7 +295,11 @@ static inline struct rtable *ip_route_newports(struct flowi4 *fl4, struct rtable
static inline int inet_iif(const struct sk_buff *skb)
{
- return skb_rtable(skb)->rt_iif;
+ int iif = skb_rtable(skb)->rt_iif;
+
+ if (iif)
+ return iif;
+ return skb->skb_iif;
}
extern int sysctl_ip_default_ttl;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-09 05:15:41 +0000