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| 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> |
| 14 | #include <linux/slab.h> |
| 15 | #include <net/rtnetlink.h> |
| 16 | #include <net/net_namespace.h> |
| 17 | #include <net/sock.h> |
| 18 | #include "br_private.h" |
| 19 | |
| 20 | static inline size_t br_nlmsg_size(void) |
| 21 | { |
| 22 | return NLMSG_ALIGN(sizeof(struct ifinfomsg)) |
| 23 | + nla_total_size(IFNAMSIZ) /* IFLA_IFNAME */ |
| 24 | + nla_total_size(MAX_ADDR_LEN) /* IFLA_ADDRESS */ |
| 25 | + nla_total_size(4) /* IFLA_MASTER */ |
| 26 | + nla_total_size(4) /* IFLA_MTU */ |
| 27 | + nla_total_size(4) /* IFLA_LINK */ |
| 28 | + nla_total_size(1) /* IFLA_OPERSTATE */ |
| 29 | + nla_total_size(1); /* IFLA_PROTINFO */ |
| 30 | } |
| 31 | |
| 32 | /* |
| 33 | * Create one netlink message for one interface |
| 34 | * Contains port and master info as well as carrier and bridge state. |
| 35 | */ |
| 36 | static int br_fill_ifinfo(struct sk_buff *skb, const struct net_bridge_port *port, |
| 37 | u32 pid, u32 seq, int event, unsigned int flags) |
| 38 | { |
| 39 | const struct net_bridge *br = port->br; |
| 40 | const struct net_device *dev = port->dev; |
| 41 | struct ifinfomsg *hdr; |
| 42 | struct nlmsghdr *nlh; |
| 43 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
| 44 | |
| 45 | br_debug(br, "br_fill_info event %d port %s master %s\n", |
| 46 | event, dev->name, br->dev->name); |
| 47 | |
| 48 | nlh = nlmsg_put(skb, pid, seq, event, sizeof(*hdr), flags); |
| 49 | if (nlh == NULL) |
| 50 | return -EMSGSIZE; |
| 51 | |
| 52 | hdr = nlmsg_data(nlh); |
| 53 | hdr->ifi_family = AF_BRIDGE; |
| 54 | hdr->__ifi_pad = 0; |
| 55 | hdr->ifi_type = dev->type; |
| 56 | hdr->ifi_index = dev->ifindex; |
| 57 | hdr->ifi_flags = dev_get_flags(dev); |
| 58 | hdr->ifi_change = 0; |
| 59 | |
| 60 | NLA_PUT_STRING(skb, IFLA_IFNAME, dev->name); |
| 61 | NLA_PUT_U32(skb, IFLA_MASTER, br->dev->ifindex); |
| 62 | NLA_PUT_U32(skb, IFLA_MTU, dev->mtu); |
| 63 | NLA_PUT_U8(skb, IFLA_OPERSTATE, operstate); |
| 64 | |
| 65 | if (dev->addr_len) |
| 66 | NLA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
| 67 | |
| 68 | if (dev->ifindex != dev->iflink) |
| 69 | NLA_PUT_U32(skb, IFLA_LINK, dev->iflink); |
| 70 | |
| 71 | if (event == RTM_NEWLINK) |
| 72 | NLA_PUT_U8(skb, IFLA_PROTINFO, port->state); |
| 73 | |
| 74 | return nlmsg_end(skb, nlh); |
| 75 | |
| 76 | nla_put_failure: |
| 77 | nlmsg_cancel(skb, nlh); |
| 78 | return -EMSGSIZE; |
| 79 | } |
| 80 | |
| 81 | /* |
| 82 | * Notify listeners of a change in port information |
| 83 | */ |
| 84 | void br_ifinfo_notify(int event, struct net_bridge_port *port) |
| 85 | { |
| 86 | struct net *net = dev_net(port->dev); |
| 87 | struct sk_buff *skb; |
| 88 | int err = -ENOBUFS; |
| 89 | |
| 90 | br_debug(port->br, "port %u(%s) event %d\n", |
| 91 | (unsigned)port->port_no, port->dev->name, event); |
| 92 | |
| 93 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
| 94 | if (skb == NULL) |
| 95 | goto errout; |
| 96 | |
| 97 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
| 98 | if (err < 0) { |
| 99 | /* -EMSGSIZE implies BUG in br_nlmsg_size() */ |
| 100 | WARN_ON(err == -EMSGSIZE); |
| 101 | kfree_skb(skb); |
| 102 | goto errout; |
| 103 | } |
| 104 | rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
| 105 | return; |
| 106 | errout: |
| 107 | if (err < 0) |
| 108 | rtnl_set_sk_err(net, RTNLGRP_LINK, err); |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Dump information about all ports, in response to GETLINK |
| 113 | */ |
| 114 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| 115 | { |
| 116 | struct net *net = sock_net(skb->sk); |
| 117 | struct net_device *dev; |
| 118 | int idx; |
| 119 | |
| 120 | idx = 0; |
| 121 | for_each_netdev(net, dev) { |
| 122 | struct net_bridge_port *port = br_port_get_rtnl(dev); |
| 123 | |
| 124 | /* not a bridge port */ |
| 125 | if (!port || idx < cb->args[0]) |
| 126 | goto skip; |
| 127 | |
| 128 | if (br_fill_ifinfo(skb, port, |
| 129 | NETLINK_CB(cb->skb).pid, |
| 130 | cb->nlh->nlmsg_seq, RTM_NEWLINK, |
| 131 | NLM_F_MULTI) < 0) |
| 132 | break; |
| 133 | skip: |
| 134 | ++idx; |
| 135 | } |
| 136 | |
| 137 | cb->args[0] = idx; |
| 138 | |
| 139 | return skb->len; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Change state of port (ie from forwarding to blocking etc) |
| 144 | * Used by spanning tree in user space. |
| 145 | */ |
| 146 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| 147 | { |
| 148 | struct net *net = sock_net(skb->sk); |
| 149 | struct ifinfomsg *ifm; |
| 150 | struct nlattr *protinfo; |
| 151 | struct net_device *dev; |
| 152 | struct net_bridge_port *p; |
| 153 | u8 new_state; |
| 154 | |
| 155 | if (nlmsg_len(nlh) < sizeof(*ifm)) |
| 156 | return -EINVAL; |
| 157 | |
| 158 | ifm = nlmsg_data(nlh); |
| 159 | if (ifm->ifi_family != AF_BRIDGE) |
| 160 | return -EPFNOSUPPORT; |
| 161 | |
| 162 | protinfo = nlmsg_find_attr(nlh, sizeof(*ifm), IFLA_PROTINFO); |
| 163 | if (!protinfo || nla_len(protinfo) < sizeof(u8)) |
| 164 | return -EINVAL; |
| 165 | |
| 166 | new_state = nla_get_u8(protinfo); |
| 167 | if (new_state > BR_STATE_BLOCKING) |
| 168 | return -EINVAL; |
| 169 | |
| 170 | dev = __dev_get_by_index(net, ifm->ifi_index); |
| 171 | if (!dev) |
| 172 | return -ENODEV; |
| 173 | |
| 174 | p = br_port_get_rtnl(dev); |
| 175 | if (!p) |
| 176 | return -EINVAL; |
| 177 | |
| 178 | /* if kernel STP is running, don't allow changes */ |
| 179 | if (p->br->stp_enabled == BR_KERNEL_STP) |
| 180 | return -EBUSY; |
| 181 | |
| 182 | if (!netif_running(dev) || |
| 183 | (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED)) |
| 184 | return -ENETDOWN; |
| 185 | |
| 186 | p->state = new_state; |
| 187 | br_log_state(p); |
| 188 | return 0; |
| 189 | } |
| 190 | |
| 191 | |
| 192 | int __init br_netlink_init(void) |
| 193 | { |
| 194 | if (__rtnl_register(PF_BRIDGE, RTM_GETLINK, NULL, br_dump_ifinfo)) |
| 195 | return -ENOBUFS; |
| 196 | |
| 197 | /* Only the first call to __rtnl_register can fail */ |
| 198 | __rtnl_register(PF_BRIDGE, RTM_SETLINK, br_rtm_setlink, NULL); |
| 199 | |
| 200 | return 0; |
| 201 | } |
| 202 | |
| 203 | void __exit br_netlink_fini(void) |
| 204 | { |
| 205 | rtnl_unregister_all(PF_BRIDGE); |
| 206 | } |
| 207 | |
| 208 |
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