/* * 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 <net/netlink.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 payload = sizeof(struct ifinfomsg) + 128; int err = -ENOBUFS; pr_debug("bridge notify event=%d\n", event); skb = nlmsg_new(nlmsg_total_size(payload), GFP_ATOMIC); if (skb == NULL) goto errout; err = br_fill_ifinfo(skb, port, 0, 0, event, 0); if (err < 0) { kfree_skb(skb); goto errout; } err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); errout: if (err < 0) rtnl_set_sk_err(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; }