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