Add a new rtnetlink group for bridge vlan notifications - RTNLGRP_BRVLAN and add support for sending vlan notifications (both single and ranges). No functional changes intended, the notification support will be used by later patches.
Signed-off-by: Nikolay Aleksandrov <[email protected]> --- include/uapi/linux/rtnetlink.h | 2 + net/bridge/br_private.h | 11 +++++ net/bridge/br_vlan.c | 79 ++++++++++++++++++++++++++++++++++ 3 files changed, 92 insertions(+) diff --git a/include/uapi/linux/rtnetlink.h b/include/uapi/linux/rtnetlink.h index e06e3e09a1b4..fe9136f87a97 100644 --- a/include/uapi/linux/rtnetlink.h +++ b/include/uapi/linux/rtnetlink.h @@ -728,6 +728,8 @@ enum rtnetlink_groups { #define RTNLGRP_IPV6_MROUTE_R RTNLGRP_IPV6_MROUTE_R RTNLGRP_NEXTHOP, #define RTNLGRP_NEXTHOP RTNLGRP_NEXTHOP + RTNLGRP_BRVLAN, +#define RTNLGRP_BRVLAN RTNLGRP_BRVLAN __RTNLGRP_MAX }; #define RTNLGRP_MAX (__RTNLGRP_MAX - 1) diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index ee3871dea68f..ba162c8197da 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -960,6 +960,10 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr); void br_vlan_rtnl_init(void); void br_vlan_rtnl_uninit(void); +void br_vlan_notify(const struct net_bridge *br, + const struct net_bridge_port *p, + u16 vid, u16 vid_range, + int cmd); static inline struct net_bridge_vlan_group *br_vlan_group( const struct net_bridge *br) @@ -1166,6 +1170,13 @@ static inline void br_vlan_rtnl_init(void) static inline void br_vlan_rtnl_uninit(void) { } + +static inline void br_vlan_notify(const struct net_bridge *br, + const struct net_bridge_port *p, + u16 vid, u16 vid_range, + int cmd) +{ +} #endif struct nf_br_ops { diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 9d64a86f2cbd..5d52a2604547 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -1540,6 +1540,85 @@ static bool br_vlan_fill_vids(struct sk_buff *skb, u16 vid, u16 vid_range, return false; } +static size_t rtnl_vlan_nlmsg_size(void) +{ + return NLMSG_ALIGN(sizeof(struct br_vlan_msg)) + + nla_total_size(0) /* BRIDGE_VLANDB_ENTRY */ + + nla_total_size(sizeof(u16)) /* BRIDGE_VLANDB_ENTRY_RANGE */ + + nla_total_size(sizeof(struct bridge_vlan_info)); /* BRIDGE_VLANDB_ENTRY_INFO */ +} + +void br_vlan_notify(const struct net_bridge *br, + const struct net_bridge_port *p, + u16 vid, u16 vid_range, + int cmd) +{ + struct net_bridge_vlan_group *vg; + struct net_bridge_vlan *v; + struct br_vlan_msg *bvm; + struct nlmsghdr *nlh; + struct sk_buff *skb; + int err = -ENOBUFS; + struct net *net; + u16 flags = 0; + int ifindex; + + /* right now notifications are done only with rtnl held */ + ASSERT_RTNL(); + + if (p) { + ifindex = p->dev->ifindex; + vg = nbp_vlan_group(p); + net = dev_net(p->dev); + } else { + ifindex = br->dev->ifindex; + vg = br_vlan_group(br); + net = dev_net(br->dev); + } + + skb = nlmsg_new(rtnl_vlan_nlmsg_size(), GFP_KERNEL); + if (!skb) + goto out_err; + + err = -EMSGSIZE; + nlh = nlmsg_put(skb, 0, 0, cmd, sizeof(*bvm), 0); + if (!nlh) + goto out_err; + bvm = nlmsg_data(nlh); + memset(bvm, 0, sizeof(*bvm)); + bvm->family = AF_BRIDGE; + bvm->ifindex = ifindex; + + switch (cmd) { + case RTM_NEWVLAN: + /* need to find the vlan due to flags/options */ + v = br_vlan_find(vg, vid); + if (!v || !br_vlan_should_use(v)) + goto out_kfree; + + flags = v->flags; + if (br_get_pvid(vg) == v->vid) + flags |= BRIDGE_VLAN_INFO_PVID; + break; + case RTM_DELVLAN: + break; + default: + goto out_kfree; + } + + if (!br_vlan_fill_vids(skb, vid, vid_range, flags)) + goto out_err; + + nlmsg_end(skb, nlh); + rtnl_notify(skb, net, 0, RTNLGRP_BRVLAN, NULL, GFP_KERNEL); + return; + +out_err: + rtnl_set_sk_err(net, RTNLGRP_BRVLAN, err); +out_kfree: + kfree_skb(skb); +} + /* check if v_curr can enter a range ending in range_end */ static bool br_vlan_can_enter_range(const struct net_bridge_vlan *v_curr, const struct net_bridge_vlan *range_end) -- 2.21.0
