#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;
__be32 rt_dst; /* Path destination */
__be32 rt_src; /* Path source */
+ int rt_route_iif;
int rt_iif;
int rt_oif;
__u32 rt_mark;
static inline bool rt_is_input_route(struct rtable *rt)
{
- return rt->rt_iif != 0;
+ return rt->rt_route_iif != 0;
}
static inline bool rt_is_output_route(struct rtable *rt)
{
- return rt->rt_iif == 0;
+ return rt->rt_route_iif == 0;
}
struct ip_rt_acct {
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);
return ip_tos2prio[IPTOS_TOS(tos)>>1];
}
-static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
- int oif, u8 protocol,
- __be16 sport, __be16 dport,
- struct sock *sk, bool can_sleep)
+/* 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)
{
- struct net *net = sock_net(sk);
- struct rtable *rt;
- struct flowi4 fl4;
- __u8 flow_flags;
+ __u8 flow_flags = 0;
- flow_flags = 0;
if (inet_sk(sk)->transparent)
flow_flags |= FLOWI_FLAG_ANYSRC;
if (protocol == IPPROTO_TCP)
if (can_sleep)
flow_flags |= FLOWI_FLAG_CAN_SLEEP;
- flowi4_init_output(&fl4, oif, sk->sk_mark, tos, RT_SCOPE_UNIVERSE,
+ 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 net *net = sock_net(sk);
+ struct rtable *rt;
+
+ 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;
+ 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;
- __u8 flow_flags;
-
- flow_flags = 0;
- if (inet_sk(sk)->transparent)
- flow_flags |= FLOWI_FLAG_ANYSRC;
- if (protocol == IPPROTO_TCP)
- flow_flags |= FLOWI_FLAG_PRECOW_METRICS;
- flowi4_init_output(&fl4, rt->rt_oif, rt->rt_mark, rt->rt_tos,
- RT_SCOPE_UNIVERSE, protocol, flow_flags,
- rt->rt_dst, rt->rt_src, dport, sport);
+ 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;
}
projects / ~andy / linux / blobdiff