This commit was manufactured by cvs2svn to create branch 'vserver'.

[linux-2.6.git] / net / bridge / br_netlink.c

diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c
new file mode 100644 (file)
index 0000000..53086fb
--- /dev/null
+++ b/net/bridge/br_netlink.c
@@ -0,0 +1,200 @@
+/*
+ *     Bridge netlink control interface
+ *
+ *     Authors:
+ *     Stephen Hemminger               <shemminger@osdl.org>
+ *
+ *     This program is free software; you can redistribute it and/or
+ *     modify it under the terms of the GNU General Public License
+ *     as published by the Free Software Foundation; either version
+ *     2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/rtnetlink.h>
+#include "br_private.h"
+
+/*
+ * Create one netlink message for one interface
+ * Contains port and master info as well as carrier and bridge state.
+ */
+static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port,
+                         u32 pid, u32 seq, int event, unsigned int flags)
+{
+       const struct net_bridge *br = port->br;
+       const struct net_device *dev = port->dev;
+       struct ifinfomsg *r;
+       struct nlmsghdr *nlh;
+       unsigned char *b = skb->tail;
+       u32 mtu = dev->mtu;
+       u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN;
+       u8 portstate = port->state;
+
+       pr_debug("br_fill_info event %d port %s master %s\n",
+                event, dev->name, br->dev->name);
+
+       nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags);
+       r = NLMSG_DATA(nlh);
+       r->ifi_family = AF_BRIDGE;
+       r->__ifi_pad = 0;
+       r->ifi_type = dev->type;
+       r->ifi_index = dev->ifindex;
+       r->ifi_flags = dev_get_flags(dev);
+       r->ifi_change = 0;
+
+       RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name);
+
+       RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex);
+
+       if (dev->addr_len)
+               RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr);
+
+       RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu);
+       if (dev->ifindex != dev->iflink)
+               RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink);
+
+
+       RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate);
+
+       if (event == RTM_NEWLINK)
+               RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate);
+
+       nlh->nlmsg_len = skb->tail - b;
+
+       return skb->len;
+
+nlmsg_failure:
+rtattr_failure:
+
+       skb_trim(skb, b - skb->data);
+       return -EINVAL;
+}
+
+/*
+ * Notify listeners of a change in port information
+ */
+void br_ifinfo_notify(int event, struct net_bridge_port *port)
+{
+       struct sk_buff *skb;
+       int err = -ENOMEM;
+
+       pr_debug("bridge notify event=%d\n", event);
+       skb = alloc_skb(NLMSG_SPACE(sizeof(struct ifinfomsg) + 128),
+                       GFP_ATOMIC);
+       if (!skb)
+               goto err_out;
+
+       err = br_fill_ifinfo(skb, port, current->pid, 0, event, 0);
+       if (err < 0)
+               goto err_kfree;
+
+       NETLINK_CB(skb).dst_group = RTNLGRP_LINK;
+       netlink_broadcast(rtnl, skb, 0, RTNLGRP_LINK, GFP_ATOMIC);
+       return;
+
+err_kfree:
+       kfree_skb(skb);
+err_out:
+       netlink_set_err(rtnl, 0, RTNLGRP_LINK, err);
+}
+
+/*
+ * Dump information about all ports, in response to GETLINK
+ */
+static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb)
+{
+       struct net_device *dev;
+       int idx;
+       int s_idx = cb->args[0];
+       int err = 0;
+
+       read_lock(&dev_base_lock);
+       for (dev = dev_base, idx = 0; dev; dev = dev->next) {
+               struct net_bridge_port *p = dev->br_port;
+
+               /* not a bridge port */
+               if (!p)
+                       continue;
+
+               if (idx < s_idx)
+                       goto cont;
+
+               err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid,
+                                    cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI);
+               if (err <= 0)
+                       break;
+cont:
+               ++idx;
+       }
+       read_unlock(&dev_base_lock);
+
+       cb->args[0] = idx;
+
+       return skb->len;
+}
+
+/*
+ * Change state of port (ie from forwarding to blocking etc)
+ * Used by spanning tree in user space.
+ */
+static int br_rtm_setlink(struct sk_buff *skb,  struct nlmsghdr *nlh, void *arg)
+{
+       struct rtattr  **rta = arg;
+       struct ifinfomsg *ifm = NLMSG_DATA(nlh);
+       struct net_device *dev;
+       struct net_bridge_port *p;
+       u8 new_state;
+
+       if (ifm->ifi_family != AF_BRIDGE)
+               return -EPFNOSUPPORT;
+
+       /* Must pass valid state as PROTINFO */
+       if (rta[IFLA_PROTINFO-1]) {
+               u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]);
+               new_state = *pstate;
+       } else
+               return -EINVAL;
+
+       if (new_state > BR_STATE_BLOCKING)
+               return -EINVAL;
+
+       /* Find bridge port */
+       dev = __dev_get_by_index(ifm->ifi_index);
+       if (!dev)
+               return -ENODEV;
+
+       p = dev->br_port;
+       if (!p)
+               return -EINVAL;
+
+       /* if kernel STP is running, don't allow changes */
+       if (p->br->stp_enabled)
+               return -EBUSY;
+
+       if (!netif_running(dev))
+               return -ENETDOWN;
+
+       if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)
+               return -ENETDOWN;
+
+       p->state = new_state;
+       br_log_state(p);
+       return 0;
+}
+
+
+static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = {
+       [RTM_GETLINK - RTM_BASE] = { .dumpit    = br_dump_ifinfo, },
+       [RTM_SETLINK - RTM_BASE] = { .doit      = br_rtm_setlink, },
+};
+
+void __init br_netlink_init(void)
+{
+       rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table;
+}
+
+void __exit br_netlink_fini(void)
+{
+       rtnetlink_links[PF_BRIDGE] = NULL;
+}
+