From f545923b4a6bd7abedac50ea3fce76c713be1b74 Mon Sep 17 00:00:00 2001 From: Nikolay Aleksandrov Date: Tue, 14 Jan 2020 19:56:14 +0200 Subject: [PATCH] net: bridge: vlan: notify on vlan add/delete/change flags Now that we can notify, send a notification on add/del or change of flags. Notifications are also compressed when possible to reduce their number and relieve user-space of extra processing, due to that we have to manually notify after each add/del in order to avoid double notifications. We try hard to notify only about the vlans which actually changed, thus a single command can result in multiple notifications about disjoint ranges if there were vlans which didn't change inside. Signed-off-by: Nikolay Aleksandrov Signed-off-by: David S. Miller --- net/bridge/br_netlink.c | 34 ++++++++++++++++++++--- net/bridge/br_private.h | 12 +++++++++ net/bridge/br_vlan.c | 71 ++++++++++++++++++++++++++++++++++++++----------- 3 files changed, 99 insertions(+), 18 deletions(-) diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c index b3da4f4..43dab40 100644 --- a/net/bridge/br_netlink.c +++ b/net/bridge/br_netlink.c @@ -568,9 +568,14 @@ int br_process_vlan_info(struct net_bridge *br, bool *changed, struct netlink_ext_ack *extack) { + int err, rtm_cmd; + if (!br_vlan_valid_id(vinfo_curr->vid, extack)) return -EINVAL; + /* needed for vlan-only NEWVLAN/DELVLAN notifications */ + rtm_cmd = br_afspec_cmd_to_rtm(cmd); + if (vinfo_curr->flags & BRIDGE_VLAN_INFO_RANGE_BEGIN) { if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack)) return -EINVAL; @@ -580,7 +585,7 @@ int br_process_vlan_info(struct net_bridge *br, if (*vinfo_last) { struct bridge_vlan_info tmp_vinfo; - int v, err; + int v, v_change_start = 0; if (!br_vlan_valid_range(vinfo_curr, *vinfo_last, extack)) return -EINVAL; @@ -588,18 +593,41 @@ int br_process_vlan_info(struct net_bridge *br, memcpy(&tmp_vinfo, *vinfo_last, sizeof(struct bridge_vlan_info)); for (v = (*vinfo_last)->vid; v <= vinfo_curr->vid; v++) { + bool curr_change = false; + tmp_vinfo.vid = v; - err = br_vlan_info(br, p, cmd, &tmp_vinfo, changed, + err = br_vlan_info(br, p, cmd, &tmp_vinfo, &curr_change, extack); if (err) break; + if (curr_change) { + *changed = curr_change; + if (!v_change_start) + v_change_start = v; + } else { + /* nothing to notify yet */ + if (!v_change_start) + continue; + br_vlan_notify(br, p, v_change_start, + v - 1, rtm_cmd); + v_change_start = 0; + } } + /* v_change_start is set only if the last/whole range changed */ + if (v_change_start) + br_vlan_notify(br, p, v_change_start, + v - 1, rtm_cmd); + *vinfo_last = NULL; return err; } - return br_vlan_info(br, p, cmd, vinfo_curr, changed, extack); + err = br_vlan_info(br, p, cmd, vinfo_curr, changed, extack); + if (*changed) + br_vlan_notify(br, p, vinfo_curr->vid, 0, rtm_cmd); + + return err; } static int br_afspec(struct net_bridge *br, diff --git a/net/bridge/br_private.h b/net/bridge/br_private.h index ba162c8..a6226ff 100644 --- a/net/bridge/br_private.h +++ b/net/bridge/br_private.h @@ -554,6 +554,18 @@ static inline bool br_vlan_valid_range(const struct bridge_vlan_info *cur, return true; } +static inline int br_afspec_cmd_to_rtm(int cmd) +{ + switch (cmd) { + case RTM_SETLINK: + return RTM_NEWVLAN; + case RTM_DELLINK: + return RTM_DELVLAN; + } + + return 0; +} + static inline int br_opt_get(const struct net_bridge *br, enum net_bridge_opts opt) { diff --git a/net/bridge/br_vlan.c b/net/bridge/br_vlan.c index 5d52a26..e4f7dd1 100644 --- a/net/bridge/br_vlan.c +++ b/net/bridge/br_vlan.c @@ -257,6 +257,10 @@ static int __vlan_add(struct net_bridge_vlan *v, u16 flags, &changed, extack); if (err) goto out_filt; + + if (changed) + br_vlan_notify(br, NULL, v->vid, 0, + RTM_NEWVLAN); } masterv = br_vlan_get_master(br, v->vid, extack); @@ -380,13 +384,31 @@ static void __vlan_group_free(struct net_bridge_vlan_group *vg) kfree(vg); } -static void __vlan_flush(struct net_bridge_vlan_group *vg) +static void __vlan_flush(const struct net_bridge *br, + const struct net_bridge_port *p, + struct net_bridge_vlan_group *vg) { struct net_bridge_vlan *vlan, *tmp; + u16 v_start = 0, v_end = 0; __vlan_delete_pvid(vg, vg->pvid); - list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) + list_for_each_entry_safe(vlan, tmp, &vg->vlan_list, vlist) { + /* take care of disjoint ranges */ + if (!v_start) { + v_start = vlan->vid; + } else if (vlan->vid - v_end != 1) { + /* found range end, notify and start next one */ + br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); + v_start = vlan->vid; + } + v_end = vlan->vid; + __vlan_del(vlan); + } + + /* notify about the last/whole vlan range */ + if (v_start) + br_vlan_notify(br, p, v_start, v_end, RTM_DELVLAN); } struct sk_buff *br_handle_vlan(struct net_bridge *br, @@ -716,7 +738,7 @@ void br_vlan_flush(struct net_bridge *br) ASSERT_RTNL(); vg = br_vlan_group(br); - __vlan_flush(vg); + __vlan_flush(br, NULL, vg); RCU_INIT_POINTER(br->vlgrp, NULL); synchronize_rcu(); __vlan_group_free(vg); @@ -925,12 +947,15 @@ static void br_vlan_disable_default_pvid(struct net_bridge *br) /* Disable default_pvid on all ports where it is still * configured. */ - if (vlan_default_pvid(br_vlan_group(br), pvid)) - br_vlan_delete(br, pvid); + if (vlan_default_pvid(br_vlan_group(br), pvid)) { + if (!br_vlan_delete(br, pvid)) + br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); + } list_for_each_entry(p, &br->port_list, list) { - if (vlan_default_pvid(nbp_vlan_group(p), pvid)) - nbp_vlan_delete(p, pvid); + if (vlan_default_pvid(nbp_vlan_group(p), pvid) && + !nbp_vlan_delete(p, pvid)) + br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); } br->default_pvid = 0; @@ -972,7 +997,10 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, &vlchange, extack); if (err) goto out; - br_vlan_delete(br, old_pvid); + + if (br_vlan_delete(br, old_pvid)) + br_vlan_notify(br, NULL, old_pvid, 0, RTM_DELVLAN); + br_vlan_notify(br, NULL, pvid, 0, RTM_NEWVLAN); set_bit(0, changed); } @@ -992,7 +1020,9 @@ int __br_vlan_set_default_pvid(struct net_bridge *br, u16 pvid, &vlchange, extack); if (err) goto err_port; - nbp_vlan_delete(p, old_pvid); + if (nbp_vlan_delete(p, old_pvid)) + br_vlan_notify(br, p, old_pvid, 0, RTM_DELVLAN); + br_vlan_notify(p->br, p, pvid, 0, RTM_NEWVLAN); set_bit(p->port_no, changed); } @@ -1007,22 +1037,28 @@ err_port: if (!test_bit(p->port_no, changed)) continue; - if (old_pvid) + if (old_pvid) { nbp_vlan_add(p, old_pvid, BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED, &vlchange, NULL); + br_vlan_notify(p->br, p, old_pvid, 0, RTM_NEWVLAN); + } nbp_vlan_delete(p, pvid); + br_vlan_notify(br, p, pvid, 0, RTM_DELVLAN); } if (test_bit(0, changed)) { - if (old_pvid) + if (old_pvid) { br_vlan_add(br, old_pvid, BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED | BRIDGE_VLAN_INFO_BRENTRY, &vlchange, NULL); + br_vlan_notify(br, NULL, old_pvid, 0, RTM_NEWVLAN); + } br_vlan_delete(br, pvid); + br_vlan_notify(br, NULL, pvid, 0, RTM_DELVLAN); } goto out; } @@ -1115,6 +1151,7 @@ int nbp_vlan_init(struct net_bridge_port *p, struct netlink_ext_ack *extack) &changed, extack); if (ret) goto err_vlan_add; + br_vlan_notify(p->br, p, p->br->default_pvid, 0, RTM_NEWVLAN); } out: return ret; @@ -1196,7 +1233,7 @@ void nbp_vlan_flush(struct net_bridge_port *port) ASSERT_RTNL(); vg = nbp_vlan_group(port); - __vlan_flush(vg); + __vlan_flush(port->br, port, vg); RCU_INIT_POINTER(port->vlgrp, NULL); synchronize_rcu(); __vlan_group_free(vg); @@ -1462,8 +1499,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr) { struct netdev_notifier_changeupper_info *info; struct net_bridge *br = netdev_priv(dev); - bool changed; - int ret = 0; + int vlcmd = 0, ret = 0; + bool changed = false; switch (event) { case NETDEV_REGISTER: @@ -1471,9 +1508,11 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr) BRIDGE_VLAN_INFO_PVID | BRIDGE_VLAN_INFO_UNTAGGED | BRIDGE_VLAN_INFO_BRENTRY, &changed, NULL); + vlcmd = RTM_NEWVLAN; break; case NETDEV_UNREGISTER: - br_vlan_delete(br, br->default_pvid); + changed = !br_vlan_delete(br, br->default_pvid); + vlcmd = RTM_DELVLAN; break; case NETDEV_CHANGEUPPER: info = ptr; @@ -1487,6 +1526,8 @@ int br_vlan_bridge_event(struct net_device *dev, unsigned long event, void *ptr) br_vlan_link_state_change(dev, br); break; } + if (changed) + br_vlan_notify(br, NULL, br->default_pvid, 0, vlcmd); return ret; } -- 2.7.4