switchdev: add new switchdev bridge setlink

Add new switchdev_port_bridge_setlink that can be used by drivers
implementing .ndo_bridge_setlink to set switchdev bridge attributes.
Basically turn the raw rtnl_bridge_setlink netlink into switchdev attr
sets.  Proper netlink attr policy checking is done on the protinfo part of
the netlink msg.

Currently, for protinfo, only bridge port attrs BR_LEARNING and
BR_LEARNING_SYNC are parsed and passed to port driver.

For afspec, VLAN objs are passed so switchdev driver can set VLANs assigned
to SELF.  To illustrate with iproute2 cmd, we have:

	bridge vlan add vid 10 dev sw1p1 self master

To add VLAN 10 to port sw1p1 for both the bridge (master) and the device
(self).

Signed-off-by: Scott Feldman <sfeldma@gmail.com>
Acked-by: Jiri Pirko <jiri@resnulli.us>
Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 140 insertions, 11 deletions

diff --git a/net/switchdev/switchdev.c b/net/switchdev/switchdev.c
index 3d4d99a70b80..b01791a9b56d 100644
--- a/net/switchdev/switchdev.c
+++ b/net/switchdev/switchdev.c
@@ -15,6 +15,7 @@
 #include <linux/mutex.h>
 #include <linux/notifier.h>
 #include <linux/netdevice.h>
+#include <linux/if_bridge.h>
 #include <net/ip_fib.h>
 #include <net/switchdev.h>
 
@@ -357,28 +358,156 @@ int call_switchdev_notifiers(unsigned long val, struct net_device *dev,
 }
 EXPORT_SYMBOL_GPL(call_switchdev_notifiers);
 
+static int switchdev_port_br_setflag(struct net_device *dev,
+                                     struct nlattr *nlattr,
+                                     unsigned long brport_flag)
+{
+        struct switchdev_attr attr = {
+                .id = SWITCHDEV_ATTR_PORT_BRIDGE_FLAGS,
+        };
+        u8 flag = nla_get_u8(nlattr);
+        int err;
+
+        err = switchdev_port_attr_get(dev, &attr);
+        if (err)
+                return err;
+
+        if (flag)
+                attr.brport_flags |= brport_flag;
+        else
+                attr.brport_flags &= ~brport_flag;
+
+        return switchdev_port_attr_set(dev, &attr);
+}
+
+static const struct nla_policy
+switchdev_port_bridge_policy[IFLA_BRPORT_MAX + 1] = {
+        [IFLA_BRPORT_STATE]             = { .type = NLA_U8 },
+        [IFLA_BRPORT_COST]              = { .type = NLA_U32 },
+        [IFLA_BRPORT_PRIORITY]          = { .type = NLA_U16 },
+        [IFLA_BRPORT_MODE]              = { .type = NLA_U8 },
+        [IFLA_BRPORT_GUARD]             = { .type = NLA_U8 },
+        [IFLA_BRPORT_PROTECT]           = { .type = NLA_U8 },
+        [IFLA_BRPORT_FAST_LEAVE]        = { .type = NLA_U8 },
+        [IFLA_BRPORT_LEARNING]          = { .type = NLA_U8 },
+        [IFLA_BRPORT_LEARNING_SYNC]     = { .type = NLA_U8 },
+        [IFLA_BRPORT_UNICAST_FLOOD]     = { .type = NLA_U8 },
+};
+
+static int switchdev_port_br_setlink_protinfo(struct net_device *dev,
+                                              struct nlattr *protinfo)
+{
+        struct nlattr *attr;
+        int rem;
+        int err;
+
+        err = nla_validate_nested(protinfo, IFLA_BRPORT_MAX,
+                                  switchdev_port_bridge_policy);
+        if (err)
+                return err;
+
+        nla_for_each_nested(attr, protinfo, rem) {
+                switch (nla_type(attr)) {
+                case IFLA_BRPORT_LEARNING:
+                        err = switchdev_port_br_setflag(dev, attr,
+                                                        BR_LEARNING);
+                        break;
+                case IFLA_BRPORT_LEARNING_SYNC:
+                        err = switchdev_port_br_setflag(dev, attr,
+                                                        BR_LEARNING_SYNC);
+                        break;
+                default:
+                        err = -EOPNOTSUPP;
+                        break;
+                }
+                if (err)
+                        return err;
+        }
+
+        return 0;
+}
+
+static int switchdev_port_br_afspec(struct net_device *dev,
+                                    struct nlattr *afspec,
+                                    int (*f)(struct net_device *dev,
+                                             struct switchdev_obj *obj))
+{
+        struct nlattr *attr;
+        struct bridge_vlan_info *vinfo;
+        struct switchdev_obj obj = {
+                .id = SWITCHDEV_OBJ_PORT_VLAN,
+        };
+        int rem;
+        int err;
+
+        nla_for_each_nested(attr, afspec, rem) {
+                if (nla_type(attr) != IFLA_BRIDGE_VLAN_INFO)
+                        continue;
+                if (nla_len(attr) != sizeof(struct bridge_vlan_info))
+                        return -EINVAL;
+                vinfo = nla_data(attr);
+                obj.vlan.flags = vinfo->flags;
+                if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) {
+                        if (obj.vlan.vid_start)
+                                return -EINVAL;
+                        obj.vlan.vid_start = vinfo->vid;
+                } else if (vinfo->flags & BRIDGE_VLAN_INFO_RANGE_END) {
+                        if (!obj.vlan.vid_start)
+                                return -EINVAL;
+                        obj.vlan.vid_end = vinfo->vid;
+                        if (obj.vlan.vid_end <= obj.vlan.vid_start)
+                                return -EINVAL;
+                        err = f(dev, &obj);
+                        if (err)
+                                return err;
+                        memset(&obj.vlan, 0, sizeof(obj.vlan));
+                } else {
+                        if (obj.vlan.vid_start)
+                                return -EINVAL;
+                        obj.vlan.vid_start = vinfo->vid;
+                        obj.vlan.vid_end = vinfo->vid;
+                        err = f(dev, &obj);
+                        if (err)
+                                return err;
+                        memset(&obj.vlan, 0, sizeof(obj.vlan));
+                }
+        }
+
+        return 0;
+}
+
 /**
- *      switchdev_port_bridge_setlink - Notify switch device port of bridge
- *      port attributes
+ *      switchdev_port_bridge_setlink - Set bridge port attributes
  *
  *      @dev: port device
- *      @nlh: netlink msg with bridge port attributes
- *      @flags: bridge setlink flags
+ *      @nlh: netlink header
+ *      @flags: netlink flags
  *
- *      Notify switch device port of bridge port attributes
+ *      Called for SELF on rtnl_bridge_setlink to set bridge port
+ *      attributes.
  */
 int switchdev_port_bridge_setlink(struct net_device *dev,
                                   struct nlmsghdr *nlh, u16 flags)
 {
-        const struct net_device_ops *ops = dev->netdev_ops;
+        struct nlattr *protinfo;
+        struct nlattr *afspec;
+        int err = 0;
 
-        if (!(dev->features & NETIF_F_HW_SWITCH_OFFLOAD))
-                return 0;
+        protinfo = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
+                                   IFLA_PROTINFO);
+        if (protinfo) {
+                err = switchdev_port_br_setlink_protinfo(dev, protinfo);
+                if (err)
+                        return err;
+        }
 
-        if (!ops->ndo_bridge_setlink)
-                return -EOPNOTSUPP;
+        afspec = nlmsg_find_attr(nlh, sizeof(struct ifinfomsg),
+                                 IFLA_AF_SPEC);
+        if (afspec)
+                err = switchdev_port_br_afspec(dev, afspec,
+                                               switchdev_port_obj_add);
 
-        return ops->ndo_bridge_setlink(dev, nlh, flags);
+        return err;
 }
 EXPORT_SYMBOL_GPL(switchdev_port_bridge_setlink);