diff options
Diffstat (limited to 'net/bridge/br_netlink.c')
| -rw-r--r-- | net/bridge/br_netlink.c | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/net/bridge/br_netlink.c b/net/bridge/br_netlink.c new file mode 100644 index 00000000000..881d7d1a732 --- /dev/null +++ b/net/bridge/br_netlink.c @@ -0,0 +1,199 @@ +/* + * 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) + 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) + continue; + + err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid, + cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); + if (err <= 0) + break; + ++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; +} + |