[PATCH v2 net-next 01/18] ipv6: Add fib6_nh_init and release to stubs

[David Ahern]

From: David Ahern <dsah...@gmail.com>

Add fib6_nh_init and fib6_nh_release to ipv6_stubs. If fib6_nh_init fails,
callers should not invoke fib6_nh_release, so there is no reason to have
a dummy stub for the IPv6 is not enabled case.

Signed-off-by: David Ahern <dsah...@gmail.com>
Reviewed-by: Ido Schimmel <ido...@mellanox.com>
---
 include/net/ipv6_stubs.h | 6 ++++++
 net/ipv6/addrconf_core.c | 9 +++++++++
 net/ipv6/af_inet6.c      | 2 ++
 3 files changed, 17 insertions(+)

diff --git a/include/net/ipv6_stubs.h b/include/net/ipv6_stubs.h
index d8d9c0b0e8c0..453b55bf6723 100644
--- a/include/net/ipv6_stubs.h
+++ b/include/net/ipv6_stubs.h
@@ -12,6 +12,8 @@
 
 /* structs from net/ip6_fib.h */
 struct fib6_info;
+struct fib6_nh;
+struct fib6_config;
 
 /* This is ugly, ideally these symbols should be built
  * into the core kernel.
@@ -40,6 +42,10 @@ struct ipv6_stub {
        u32 (*ip6_mtu_from_fib6)(struct fib6_info *f6i, struct in6_addr *daddr,
                                 struct in6_addr *saddr);
 
+       int (*fib6_nh_init)(struct net *net, struct fib6_nh *fib6_nh,
+                           struct fib6_config *cfg, gfp_t gfp_flags,
+                           struct netlink_ext_ack *extack);
+       void (*fib6_nh_release)(struct fib6_nh *fib6_nh);
        void (*udpv6_encap_enable)(void);
        void (*ndisc_send_na)(struct net_device *dev, const struct in6_addr 
*daddr,
                              const struct in6_addr *solicited_addr,
diff --git a/net/ipv6/addrconf_core.c b/net/ipv6/addrconf_core.c
index 945b66e3008f..e37e4c5871f7 100644
--- a/net/ipv6/addrconf_core.c
+++ b/net/ipv6/addrconf_core.c
@@ -173,6 +173,14 @@ eafnosupport_ip6_mtu_from_fib6(struct fib6_info *f6i, 
struct in6_addr *daddr,
        return 0;
 }
 
+static int eafnosupport_fib6_nh_init(struct net *net, struct fib6_nh *fib6_nh,
+                                    struct fib6_config *cfg, gfp_t gfp_flags,
+                                    struct netlink_ext_ack *extack)
+{
+       NL_SET_ERR_MSG(extack, "IPv6 support not enabled in kernel");
+       return -EAFNOSUPPORT;
+}
+
 const struct ipv6_stub *ipv6_stub __read_mostly = &(struct ipv6_stub) {
        .ipv6_dst_lookup   = eafnosupport_ipv6_dst_lookup,
        .ipv6_route_input  = eafnosupport_ipv6_route_input,
@@ -181,6 +189,7 @@ const struct ipv6_stub *ipv6_stub __read_mostly = &(struct 
ipv6_stub) {
        .fib6_lookup       = eafnosupport_fib6_lookup,
        .fib6_multipath_select = eafnosupport_fib6_multipath_select,
        .ip6_mtu_from_fib6 = eafnosupport_ip6_mtu_from_fib6,
+       .fib6_nh_init      = eafnosupport_fib6_nh_init,
 };
 EXPORT_SYMBOL_GPL(ipv6_stub);
 
diff --git a/net/ipv6/af_inet6.c b/net/ipv6/af_inet6.c
index 1789bf99c419..1dac6ea6666a 100644
--- a/net/ipv6/af_inet6.c
+++ b/net/ipv6/af_inet6.c
@@ -919,6 +919,8 @@ static const struct ipv6_stub ipv6_stub_impl = {
        .fib6_lookup       = fib6_lookup,
        .fib6_multipath_select = fib6_multipath_select,
        .ip6_mtu_from_fib6 = ip6_mtu_from_fib6,
+       .fib6_nh_init      = fib6_nh_init,
+       .fib6_nh_release   = fib6_nh_release,
        .udpv6_encap_enable = udpv6_encap_enable,
        .ndisc_send_na = ndisc_send_na,
        .nd_tbl = &nd_tbl,
-- 
2.11.0