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Diffstat (limited to 'include/net/route.h')
-rw-r--r--include/net/route.h163
1 files changed, 82 insertions, 81 deletions
diff --git a/include/net/route.h b/include/net/route.h
index 8fce0621cad..db7b3432f07 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -35,16 +35,8 @@
#include <linux/cache.h>
#include <linux/security.h>
-#ifndef __KERNEL__
-#warning This file is not supposed to be used outside of kernel.
-#endif
-
#define RTO_ONLINK 0x01
-#define RTO_CONN 0
-/* RTO_CONN is not used (being alias for 0), but preserved not to break
- * some modules referring to it. */
-
#define RT_CONN_FLAGS(sk) (RT_TOS(inet_sk(sk)->tos) | sock_flag(sk, SOCK_LOCALROUTE))
struct fib_nh;
@@ -60,7 +52,7 @@ struct rtable {
int rt_genid;
unsigned rt_flags;
__u16 rt_type;
- __u8 rt_tos;
+ __u8 rt_key_tos;
__be32 rt_dst; /* Path destination */
__be32 rt_src; /* Path source */
@@ -123,7 +115,7 @@ extern void ip_rt_redirect(__be32 old_gw, __be32 dst, __be32 new_gw,
__be32 src, struct net_device *dev);
extern void rt_cache_flush(struct net *net, int how);
extern void rt_cache_flush_batch(struct net *net);
-extern struct rtable *__ip_route_output_key(struct net *, const struct flowi4 *flp);
+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);
@@ -145,40 +137,33 @@ static inline struct rtable *ip_route_output(struct net *net, __be32 daddr,
return ip_route_output_key(net, &fl4);
}
-static inline struct rtable *ip_route_output_ports(struct net *net, struct sock *sk,
+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)
{
- struct flowi4 fl4 = {
- .flowi4_oif = oif,
- .flowi4_flags = sk ? inet_sk_flowi_flags(sk) : 0,
- .flowi4_mark = sk ? sk->sk_mark : 0,
- .daddr = daddr,
- .saddr = saddr,
- .flowi4_tos = tos,
- .flowi4_proto = proto,
- .fl4_dport = dport,
- .fl4_sport = sport,
- };
+ 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);
if (sk)
- security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
- return ip_route_output_flow(net, &fl4, 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,
+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)
{
- struct flowi4 fl4 = {
- .flowi4_oif = oif,
- .daddr = daddr,
- .saddr = saddr,
- .flowi4_tos = tos,
- .flowi4_proto = IPPROTO_GRE,
- .fl4_gre_key = gre_key,
- };
- return ip_route_output_key(net, &fl4);
+ 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);
}
extern int ip_route_input_common(struct sk_buff *skb, __be32 dst, __be32 src,
@@ -196,14 +181,15 @@ static inline int ip_route_input_noref(struct sk_buff *skb, __be32 dst, __be32 s
return ip_route_input_common(skb, dst, src, tos, devin, true);
}
-extern unsigned short ip_rt_frag_needed(struct net *net, struct iphdr *iph, unsigned short new_mtu, struct net_device *dev);
+extern unsigned short ip_rt_frag_needed(struct net *net, const struct iphdr *iph,
+ unsigned short new_mtu, struct net_device *dev);
extern void ip_rt_send_redirect(struct sk_buff *skb);
extern unsigned inet_addr_type(struct net *net, __be32 addr);
extern unsigned 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 rtable *rt);
+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);
struct in_ifaddr;
@@ -225,78 +211,93 @@ static inline char rt_tos2priority(u8 tos)
return ip_tos2prio[IPTOS_TOS(tos)>>1];
}
-static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
+/* 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, bool can_sleep)
+{
+ __u8 flow_flags = 0;
+
+ if (inet_sk(sk)->transparent)
+ flow_flags |= FLOWI_FLAG_ANYSRC;
+ if (protocol == IPPROTO_TCP)
+ flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
+ 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);
+}
+
+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 flowi4 fl4 = {
- .flowi4_oif = oif,
- .flowi4_mark = sk->sk_mark,
- .daddr = dst,
- .saddr = src,
- .flowi4_tos = tos,
- .flowi4_proto = protocol,
- .fl4_sport = sport,
- .fl4_dport = dport,
- };
struct net *net = sock_net(sk);
struct rtable *rt;
- if (inet_sk(sk)->transparent)
- fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
- if (protocol == IPPROTO_TCP)
- fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
- if (can_sleep)
- fl4.flowi4_flags |= FLOWI_FLAG_CAN_SLEEP;
+ ip_route_connect_init(fl4, dst, src, tos, oif, protocol,
+ sport, dport, sk, can_sleep);
if (!dst || !src) {
- rt = __ip_route_output_key(net, &fl4);
+ rt = __ip_route_output_key(net, fl4);
if (IS_ERR(rt))
return rt;
- fl4.daddr = rt->rt_dst;
- fl4.saddr = rt->rt_src;
ip_rt_put(rt);
}
- security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
- return ip_route_output_flow(net, &fl4, sk);
+ 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 rtable *rt,
- u8 protocol, __be16 orig_sport,
- __be16 orig_dport, __be16 sport,
- __be16 dport, struct sock *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) {
- struct flowi4 fl4 = {
- .flowi4_oif = rt->rt_oif,
- .flowi4_mark = rt->rt_mark,
- .daddr = rt->rt_dst,
- .saddr = rt->rt_src,
- .flowi4_tos = rt->rt_tos,
- .flowi4_proto = protocol,
- .fl4_sport = sport,
- .fl4_dport = dport
- };
- if (inet_sk(sk)->transparent)
- fl4.flowi4_flags |= FLOWI_FLAG_ANYSRC;
- if (protocol == IPPROTO_TCP)
- fl4.flowi4_flags |= FLOWI_FLAG_PRECOW_METRICS;
+ fl4->fl4_dport = dport;
+ fl4->fl4_sport = sport;
ip_rt_put(rt);
- security_sk_classify_flow(sk, flowi4_to_flowi(&fl4));
- return ip_route_output_flow(sock_net(sk), &fl4, sk);
+ security_sk_classify_flow(sk, flowi4_to_flowi(fl4));
+ return ip_route_output_flow(sock_net(sk), fl4, sk);
}
return rt;
}
-extern void rt_bind_peer(struct rtable *rt, int create);
+extern void rt_bind_peer(struct rtable *rt, __be32 daddr, int create);
-static inline struct inet_peer *rt_get_peer(struct rtable *rt)
+static inline struct inet_peer *rt_get_peer(struct rtable *rt, __be32 daddr)
{
if (rt->peer)
return rt->peer;
- rt_bind_peer(rt, 0);
+ rt_bind_peer(rt, daddr, 0);
return rt->peer;
}
generated by cgit v1.2.3-70-g09d2 (git 2.51.2) at 2025-11-04 06:40:12 +0000