net: Add FLOWI_FLAG_CAN_SLEEP.

And set is in contexts where the route resolution can sleep.

Signed-off-by: David S. Miller <davem@davemloft.net>

5 files changed, 11 insertions, 3 deletions

diff --git a/include/net/flow.h b/include/net/flow.h
index f2080e65276d..fd0413873b8e 100644
--- a/include/net/flow.h
+++ b/include/net/flow.h
@@ -50,6 +50,7 @@ struct flowi {
         __u8    flags;
 #define FLOWI_FLAG_ANYSRC               0x01
 #define FLOWI_FLAG_PRECOW_METRICS       0x02
+#define FLOWI_FLAG_CAN_SLEEP            0x04
         union {
                 struct {
                         __be16  sport;
diff --git a/include/net/route.h b/include/net/route.h
index 6de4333d6002..1be5c05a0905 100644
--- a/include/net/route.h
+++ b/include/net/route.h
@@ -185,6 +185,8 @@ static inline int ip_route_connect(struct rtable **rp, __be32 dst,
                 fl.flags |= FLOWI_FLAG_ANYSRC;
         if (protocol == IPPROTO_TCP)
                 fl.flags |= FLOWI_FLAG_PRECOW_METRICS;
+        if (can_sleep)
+                fl.flags |= FLOWI_FLAG_CAN_SLEEP;
 
         if (!dst || !src) {
                 err = __ip_route_output_key(net, rp, &fl);
diff --git a/net/ipv4/raw.c b/net/ipv4/raw.c
index e1857658964d..e8e8613bcbcc 100644
--- a/net/ipv4/raw.c
+++ b/net/ipv4/raw.c
@@ -555,7 +555,8 @@ static int raw_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                                     .fl4_tos = tos,
                                     .proto = inet->hdrincl ? IPPROTO_RAW :
                                                              sk->sk_protocol,
-                                  };
+                                    .flags = FLOWI_FLAG_CAN_SLEEP,
+                };
                 if (!inet->hdrincl) {
                         err = raw_probe_proto_opt(&fl, msg);
                         if (err)
diff --git a/net/ipv4/udp.c b/net/ipv4/udp.c
index 790187b5c308..c6bcc93debd5 100644
--- a/net/ipv4/udp.c
+++ b/net/ipv4/udp.c
@@ -914,9 +914,11 @@ int udp_sendmsg(struct kiocb *iocb, struct sock *sk, struct msghdr *msg,
                                     .fl4_src = saddr,
                                     .fl4_tos = tos,
                                     .proto = sk->sk_protocol,
-                                    .flags = inet_sk_flowi_flags(sk),
+                                    .flags = (inet_sk_flowi_flags(sk) |
+                                              FLOWI_FLAG_CAN_SLEEP),
                                     .fl_ip_sport = inet->inet_sport,
-                                    .fl_ip_dport = dport };
+                                    .fl_ip_dport = dport
+                };
                 struct net *net = sock_net(sk);
 
                 security_sk_classify_flow(sk, &fl);
diff --git a/net/ipv6/ip6_output.c b/net/ipv6/ip6_output.c
index 28209b2d254d..77b1942f335b 100644
--- a/net/ipv6/ip6_output.c
+++ b/net/ipv6/ip6_output.c
@@ -1026,6 +1026,7 @@ struct dst_entry *ip6_dst_lookup_flow(struct sock *sk, struct flowi *fl,
         if (final_dst)
                 ipv6_addr_copy(&fl->fl6_dst, final_dst);
         if (want_blackhole) {
+                fl->flags |= FLOWI_FLAG_CAN_SLEEP;
                 err = __xfrm_lookup(sock_net(sk), &dst, fl, sk, XFRM_LOOKUP_WAIT);
                 if (err == -EREMOTE)
                         err = ip6_dst_blackhole(sk, &dst, fl);
@@ -1070,6 +1071,7 @@ struct dst_entry *ip6_sk_dst_lookup_flow(struct sock *sk, struct flowi *fl,
         if (final_dst)
                 ipv6_addr_copy(&fl->fl6_dst, final_dst);
         if (want_blackhole) {
+                fl->flags |= FLOWI_FLAG_CAN_SLEEP;
                 err = __xfrm_lookup(sock_net(sk), &dst, fl, sk, XFRM_LOOKUP_WAIT);
                 if (err == -EREMOTE)
                         err = ip6_dst_blackhole(sk, &dst, fl);