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-rw-r--r--include/net/route.h88
-rw-r--r--net/dccp/ipv4.c10
-rw-r--r--net/ipv4/af_inet.c3
-rw-r--r--net/ipv4/datagram.c3
-rw-r--r--net/ipv4/tcp_ipv4.c10
-rw-r--r--net/l2tp/l2tp_ip.c8
6 files changed, 74 insertions, 48 deletions
diff --git a/include/net/route.h b/include/net/route.h
index 3684c3edbae4..79530da31b34 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -217,17 +217,37 @@ 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,
- 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)
@@ -235,41 +255,45 @@ static inline struct rtable *ip_route_connect(__be32 dst, __be32 src, u32 tos,
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;
}
diff --git a/net/dccp/ipv4.c b/net/dccp/ipv4.c
index ae451c6d83ba..b92ab655d44e 100644
--- a/net/dccp/ipv4.c
+++ b/net/dccp/ipv4.c
@@ -40,12 +40,13 @@
int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
+ const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
struct inet_sock *inet = inet_sk(sk);
struct dccp_sock *dp = dccp_sk(sk);
- const struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
__be16 orig_sport, orig_dport;
- struct rtable *rt;
__be32 daddr, nexthop;
+ struct flowi4 fl4;
+ struct rtable *rt;
int err;
dp->dccps_role = DCCP_ROLE_CLIENT;
@@ -65,7 +66,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
orig_sport = inet->inet_sport;
orig_dport = usin->sin_port;
- rt = ip_route_connect(nexthop, inet->inet_saddr,
+ rt = ip_route_connect(&fl4, nexthop, inet->inet_saddr,
RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
IPPROTO_DCCP,
orig_sport, orig_dport, sk, true);
@@ -101,8 +102,7 @@ int dccp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (err != 0)
goto failure;
- rt = ip_route_newports(rt, IPPROTO_DCCP,
- orig_sport, orig_dport,
+ rt = ip_route_newports(&fl4, rt, orig_sport, orig_dport,
inet->inet_sport, inet->inet_dport, sk);
if (IS_ERR(rt)) {
rt = NULL;
diff --git a/net/ipv4/af_inet.c b/net/ipv4/af_inet.c
index cae75ef21fea..0413af3e2285 100644
--- a/net/ipv4/af_inet.c
+++ b/net/ipv4/af_inet.c
@@ -1103,6 +1103,7 @@ static int inet_sk_reselect_saddr(struct sock *sk)
struct inet_sock *inet = inet_sk(sk);
__be32 old_saddr = inet->inet_saddr;
__be32 daddr = inet->inet_daddr;
+ struct flowi4 fl4;
struct rtable *rt;
__be32 new_saddr;
@@ -1110,7 +1111,7 @@ static int inet_sk_reselect_saddr(struct sock *sk)
daddr = inet->opt->faddr;
/* Query new route. */
- rt = ip_route_connect(daddr, 0, RT_CONN_FLAGS(sk),
+ rt = ip_route_connect(&fl4, daddr, 0, RT_CONN_FLAGS(sk),
sk->sk_bound_dev_if, sk->sk_protocol,
inet->inet_sport, inet->inet_dport, sk, false);
if (IS_ERR(rt))
diff --git a/net/ipv4/datagram.c b/net/ipv4/datagram.c
index 85bd24ca4f6d..216ba2338b64 100644
--- a/net/ipv4/datagram.c
+++ b/net/ipv4/datagram.c
@@ -24,6 +24,7 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
struct inet_sock *inet = inet_sk(sk);
struct sockaddr_in *usin = (struct sockaddr_in *) uaddr;
+ struct flowi4 fl4;
struct rtable *rt;
__be32 saddr;
int oif;
@@ -46,7 +47,7 @@ int ip4_datagram_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (!saddr)
saddr = inet->mc_addr;
}
- rt = ip_route_connect(usin->sin_addr.s_addr, saddr,
+ rt = ip_route_connect(&fl4, usin->sin_addr.s_addr, saddr,
RT_CONN_FLAGS(sk), oif,
sk->sk_protocol,
inet->inet_sport, usin->sin_port, sk, true);
diff --git a/net/ipv4/tcp_ipv4.c b/net/ipv4/tcp_ipv4.c
index edf18bd74b87..310454c2f4d1 100644
--- a/net/ipv4/tcp_ipv4.c
+++ b/net/ipv4/tcp_ipv4.c
@@ -146,12 +146,13 @@ EXPORT_SYMBOL_GPL(tcp_twsk_unique);
/* This will initiate an outgoing connection. */
int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
+ struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
- struct sockaddr_in *usin = (struct sockaddr_in *)uaddr;
__be16 orig_sport, orig_dport;
- struct rtable *rt;
__be32 daddr, nexthop;
+ struct flowi4 fl4;
+ struct rtable *rt;
int err;
if (addr_len < sizeof(struct sockaddr_in))
@@ -169,7 +170,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
orig_sport = inet->inet_sport;
orig_dport = usin->sin_port;
- rt = ip_route_connect(nexthop, inet->inet_saddr,
+ rt = ip_route_connect(&fl4, nexthop, inet->inet_saddr,
RT_CONN_FLAGS(sk), sk->sk_bound_dev_if,
IPPROTO_TCP,
orig_sport, orig_dport, sk, true);
@@ -236,8 +237,7 @@ int tcp_v4_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
if (err)
goto failure;
- rt = ip_route_newports(rt, IPPROTO_TCP,
- orig_sport, orig_dport,
+ rt = ip_route_newports(&fl4, rt, orig_sport, orig_dport,
inet->inet_sport, inet->inet_dport, sk);
if (IS_ERR(rt)) {
err = PTR_ERR(rt);
diff --git a/net/l2tp/l2tp_ip.c b/net/l2tp/l2tp_ip.c
index fce9bd3bd3fe..cc673677c5de 100644
--- a/net/l2tp/l2tp_ip.c
+++ b/net/l2tp/l2tp_ip.c
@@ -296,12 +296,12 @@ out_in_use:
static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len)
{
- int rc;
- struct inet_sock *inet = inet_sk(sk);
struct sockaddr_l2tpip *lsa = (struct sockaddr_l2tpip *) uaddr;
+ struct inet_sock *inet = inet_sk(sk);
+ struct flowi4 fl4;
struct rtable *rt;
__be32 saddr;
- int oif;
+ int oif, rc;
rc = -EINVAL;
if (addr_len < sizeof(*lsa))
@@ -320,7 +320,7 @@ static int l2tp_ip_connect(struct sock *sk, struct sockaddr *uaddr, int addr_len
if (ipv4_is_multicast(lsa->l2tp_addr.s_addr))
goto out;
- rt = ip_route_connect(lsa->l2tp_addr.s_addr, saddr,
+ rt = ip_route_connect(&fl4, lsa->l2tp_addr.s_addr, saddr,
RT_CONN_FLAGS(sk), oif,
IPPROTO_L2TP,
0, 0, sk, true);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.