Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Bridge netlink control interface |
| 3 | * |
| 4 | * Authors: |
| 5 | * Stephen Hemminger <shemminger@osdl.org> |
| 6 | * |
| 7 | * This program is free software; you can redistribute it and/or |
| 8 | * modify it under the terms of the GNU General Public License |
| 9 | * as published by the Free Software Foundation; either version |
| 10 | * 2 of the License, or (at your option) any later version. |
| 11 | */ |
| 12 | |
| 13 | #include <linux/kernel.h> |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 14 | #include <net/rtnetlink.h> |
Eric W. Biederman | 881d966 | 2007-09-17 11:56:21 -0700 | [diff] [blame] | 15 | #include <net/net_namespace.h> |
Denis V. Lunev | b854272 | 2007-12-01 00:21:31 +1100 | [diff] [blame] | 16 | #include <net/sock.h> |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 17 | #include "br_private.h" |
| 18 | |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 19 | static inline size_t br_nlmsg_size(void) |
| 20 | { |
| 21 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| 22 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| 23 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
| 24 | + nla_total_size(4) /* IFLA_MASTER */ |
| 25 | + nla_total_size(4) /* IFLA_MTU */ |
| 26 | + nla_total_size(4) /* IFLA_LINK */ |
| 27 | + nla_total_size(1) /* IFLA_OPERSTATE */ |
| 28 | + nla_total_size(1); /* IFLA_PROTINFO */ |
| 29 | } |
| 30 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 31 | /* |
| 32 | * Create one netlink message for one interface |
| 33 | * Contains port and master info as well as carrier and bridge state. |
| 34 | */ |
| 35 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, |
| 36 | u32 pid, u32 seq, int event, unsigned int flags) |
| 37 | { |
| 38 | const struct net_bridge *br = port->br; |
| 39 | const struct net_device *dev = port->dev; |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 40 | struct ifinfomsg *hdr; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 41 | struct nlmsghdr *nlh; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 42 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 43 | |
| 44 | pr_debug("br_fill_info event %d port %s master %s\n", |
| 45 | event, dev->name, br->dev->name); |
| 46 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 47 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
| 48 | if (nlh == NULL) |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 49 | return -EMSGSIZE; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 50 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 51 | hdr = nlmsg_data(nlh); |
| 52 | hdr->ifi_family = AF_BRIDGE; |
| 53 | hdr->__ifi_pad = 0; |
| 54 | hdr->ifi_type = dev->type; |
| 55 | hdr->ifi_index = dev->ifindex; |
| 56 | hdr->ifi_flags = dev_get_flags(dev); |
| 57 | hdr->ifi_change = 0; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 58 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 59 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
| 60 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); |
| 61 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); |
| 62 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 63 | |
| 64 | if (dev->addr_len) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 65 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 66 | |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 67 | if (dev->ifindex != dev->iflink) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 68 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 69 | |
| 70 | if (event == RTM_NEWLINK) |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 71 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 72 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 73 | return nlmsg_end(skb, nlh); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 74 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 75 | nla_put_failure: |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 76 | nlmsg_cancel(skb, nlh); |
| 77 | return -EMSGSIZE; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Notify listeners of a change in port information |
| 82 | */ |
| 83 | void br_ifinfo_notify(int event, struct net_bridge_port *port) |
| 84 | { |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame^] | 85 | struct net *net = dev_net(port->dev); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 86 | struct sk_buff *skb; |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 87 | int err = -ENOBUFS; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 88 | |
| 89 | pr_debug("bridge notify event=%d\n", event); |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame] | 90 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 91 | if (skb == NULL) |
| 92 | goto errout; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 93 | |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 94 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
Patrick McHardy | 2693256 | 2007-01-31 23:16:40 -0800 | [diff] [blame] | 95 | if (err < 0) { |
| 96 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ |
| 97 | WARN_ON(err == -EMSGSIZE); |
| 98 | kfree_skb(skb); |
| 99 | goto errout; |
| 100 | } |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame^] | 101 | err = rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 102 | errout: |
Stephen Hemminger | bea1b42 | 2006-08-03 16:24:02 -0700 | [diff] [blame] | 103 | if (err < 0) |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame^] | 104 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 105 | } |
| 106 | |
| 107 | /* |
| 108 | * Dump information about all ports, in response to GETLINK |
| 109 | */ |
| 110 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| 111 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 112 | struct net *net = sock_net(skb->sk); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 113 | struct net_device *dev; |
| 114 | int idx; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 115 | |
Pavel Emelianov | 7562f87 | 2007-05-03 15:13:45 -0700 | [diff] [blame] | 116 | idx = 0; |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame^] | 117 | for_each_netdev(net, dev) { |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 118 | /* not a bridge port */ |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 119 | if (dev->br_port == NULL || idx < cb->args[0]) |
| 120 | goto skip; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 121 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 122 | if (br_fill_ifinfo(skb, dev->br_port, NETLINK_CB(cb->skb).pid, |
| 123 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
| 124 | NLM_F_MULTI) < 0) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 125 | break; |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 126 | skip: |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 127 | ++idx; |
| 128 | } |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 129 | |
| 130 | cb->args[0] = idx; |
| 131 | |
| 132 | return skb->len; |
| 133 | } |
| 134 | |
| 135 | /* |
| 136 | * Change state of port (ie from forwarding to blocking etc) |
| 137 | * Used by spanning tree in user space. |
| 138 | */ |
| 139 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| 140 | { |
YOSHIFUJI Hideaki | 3b1e0a6 | 2008-03-26 02:26:21 +0900 | [diff] [blame] | 141 | struct net *net = sock_net(skb->sk); |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 142 | struct ifinfomsg *ifm; |
| 143 | struct nlattr *protinfo; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 144 | struct net_device *dev; |
| 145 | struct net_bridge_port *p; |
| 146 | u8 new_state; |
| 147 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 148 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
| 149 | return -EINVAL; |
| 150 | |
| 151 | ifm = nlmsg_data(nlh); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 152 | if (ifm->ifi_family != AF_BRIDGE) |
| 153 | return -EPFNOSUPPORT; |
| 154 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 155 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
| 156 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 157 | return -EINVAL; |
| 158 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 159 | new_state = nla_get_u8(protinfo); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 160 | if (new_state > BR_STATE_BLOCKING) |
| 161 | return -EINVAL; |
| 162 | |
Alexey Dobriyan | 4aa678b | 2008-09-08 16:19:58 -0700 | [diff] [blame^] | 163 | dev = __dev_get_by_index(net, ifm->ifi_index); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 164 | if (!dev) |
| 165 | return -ENODEV; |
| 166 | |
| 167 | p = dev->br_port; |
| 168 | if (!p) |
| 169 | return -EINVAL; |
| 170 | |
| 171 | /* if kernel STP is running, don't allow changes */ |
Stephen Hemminger | 9cde070 | 2007-03-21 14:22:44 -0700 | [diff] [blame] | 172 | if (p->br->stp_enabled == BR_KERNEL_STP) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 173 | return -EBUSY; |
| 174 | |
Thomas Graf | 7468596 | 2006-11-20 16:20:22 -0800 | [diff] [blame] | 175 | if (!netif_running(dev) || |
| 176 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 177 | return -ENETDOWN; |
| 178 | |
| 179 | p->state = new_state; |
| 180 | br_log_state(p); |
| 181 | return 0; |
| 182 | } |
| 183 | |
| 184 | |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 185 | int __init br_netlink_init(void) |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 186 | { |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 187 | if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
| 188 | return -ENOBUFS; |
| 189 | |
| 190 | /* Only the first call to __rtnl_register can fail */ |
| 191 | __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); |
| 192 | |
| 193 | return 0; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | void __exit br_netlink_fini(void) |
| 197 | { |
Thomas Graf | 32fe21c | 2007-03-22 11:59:03 -0700 | [diff] [blame] | 198 | rtnl_unregister_all(PF_BRIDGE); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 199 | } |
| 200 | |