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; |
| 39 | struct ifinfomsg *r; |
| 40 | struct nlmsghdr *nlh; |
| 41 | unsigned char *b = skb->tail; |
| 42 | u32 mtu = dev->mtu; |
| 43 | u8 operstate = netif_running(dev) ? dev->operstate : IF_OPER_DOWN; |
| 44 | u8 portstate = port->state; |
| 45 | |
| 46 | pr_debug("br_fill_info event %d port %s master %s\n", |
| 47 | event, dev->name, br->dev->name); |
| 48 | |
| 49 | nlh = NLMSG_NEW(skb, pid, seq, event, sizeof(*r), flags); |
| 50 | r = NLMSG_DATA(nlh); |
| 51 | r->ifi_family = AF_BRIDGE; |
| 52 | r->__ifi_pad = 0; |
| 53 | r->ifi_type = dev->type; |
| 54 | r->ifi_index = dev->ifindex; |
| 55 | r->ifi_flags = dev_get_flags(dev); |
| 56 | r->ifi_change = 0; |
| 57 | |
| 58 | RTA_PUT(skb, IFLA_IFNAME, strlen(dev->name)+1, dev->name); |
| 59 | |
| 60 | RTA_PUT(skb, IFLA_MASTER, sizeof(int), &br->dev->ifindex); |
| 61 | |
| 62 | if (dev->addr_len) |
| 63 | RTA_PUT(skb, IFLA_ADDRESS, dev->addr_len, dev->dev_addr); |
| 64 | |
| 65 | RTA_PUT(skb, IFLA_MTU, sizeof(mtu), &mtu); |
| 66 | if (dev->ifindex != dev->iflink) |
| 67 | RTA_PUT(skb, IFLA_LINK, sizeof(int), &dev->iflink); |
| 68 | |
| 69 | |
| 70 | RTA_PUT(skb, IFLA_OPERSTATE, sizeof(operstate), &operstate); |
| 71 | |
| 72 | if (event == RTM_NEWLINK) |
| 73 | RTA_PUT(skb, IFLA_PROTINFO, sizeof(portstate), &portstate); |
| 74 | |
| 75 | nlh->nlmsg_len = skb->tail - b; |
| 76 | |
| 77 | return skb->len; |
| 78 | |
| 79 | nlmsg_failure: |
| 80 | rtattr_failure: |
| 81 | |
| 82 | skb_trim(skb, b - skb->data); |
| 83 | return -EINVAL; |
| 84 | } |
| 85 | |
| 86 | /* |
| 87 | * Notify listeners of a change in port information |
| 88 | */ |
| 89 | void br_ifinfo_notify(int event, struct net_bridge_port *port) |
| 90 | { |
| 91 | struct sk_buff *skb; |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 92 | int err = -ENOBUFS; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 93 | |
| 94 | pr_debug("bridge notify event=%d\n", event); |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame^] | 95 | skb = nlmsg_new(br_nlmsg_size(), GFP_ATOMIC); |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 96 | if (skb == NULL) |
| 97 | goto errout; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 98 | |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 99 | err = br_fill_ifinfo(skb, port, 0, 0, event, 0); |
Thomas Graf | 339bf98 | 2006-11-10 14:10:15 -0800 | [diff] [blame^] | 100 | /* failure implies BUG in br_nlmsg_size() */ |
| 101 | BUG_ON(err < 0); |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 102 | |
| 103 | err = rtnl_notify(skb, 0, RTNLGRP_LINK, NULL, GFP_ATOMIC); |
| 104 | errout: |
Stephen Hemminger | bea1b42 | 2006-08-03 16:24:02 -0700 | [diff] [blame] | 105 | if (err < 0) |
Thomas Graf | 280a306 | 2006-08-15 00:36:28 -0700 | [diff] [blame] | 106 | rtnl_set_sk_err(RTNLGRP_LINK, err); |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 107 | } |
| 108 | |
| 109 | /* |
| 110 | * Dump information about all ports, in response to GETLINK |
| 111 | */ |
| 112 | static int br_dump_ifinfo(struct sk_buff *skb, struct netlink_callback *cb) |
| 113 | { |
| 114 | struct net_device *dev; |
| 115 | int idx; |
| 116 | int s_idx = cb->args[0]; |
| 117 | int err = 0; |
| 118 | |
| 119 | read_lock(&dev_base_lock); |
| 120 | for (dev = dev_base, idx = 0; dev; dev = dev->next) { |
| 121 | struct net_bridge_port *p = dev->br_port; |
| 122 | |
| 123 | /* not a bridge port */ |
| 124 | if (!p) |
| 125 | continue; |
| 126 | |
| 127 | if (idx < s_idx) |
Andrey Savochkin | 69ee20a | 2006-07-03 19:50:14 -0700 | [diff] [blame] | 128 | goto cont; |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 129 | |
| 130 | err = br_fill_ifinfo(skb, p, NETLINK_CB(cb->skb).pid, |
| 131 | cb->nlh->nlmsg_seq, RTM_NEWLINK, NLM_F_MULTI); |
| 132 | if (err <= 0) |
| 133 | break; |
Andrey Savochkin | 69ee20a | 2006-07-03 19:50:14 -0700 | [diff] [blame] | 134 | cont: |
Stephen Hemminger | 11dc1f3 | 2006-05-25 16:00:12 -0700 | [diff] [blame] | 135 | ++idx; |
| 136 | } |
| 137 | read_unlock(&dev_base_lock); |
| 138 | |
| 139 | cb->args[0] = idx; |
| 140 | |
| 141 | return skb->len; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Change state of port (ie from forwarding to blocking etc) |
| 146 | * Used by spanning tree in user space. |
| 147 | */ |
| 148 | static int br_rtm_setlink(struct sk_buff *skb, struct nlmsghdr *nlh, void *arg) |
| 149 | { |
| 150 | struct rtattr **rta = arg; |
| 151 | struct ifinfomsg *ifm = NLMSG_DATA(nlh); |
| 152 | struct net_device *dev; |
| 153 | struct net_bridge_port *p; |
| 154 | u8 new_state; |
| 155 | |
| 156 | if (ifm->ifi_family != AF_BRIDGE) |
| 157 | return -EPFNOSUPPORT; |
| 158 | |
| 159 | /* Must pass valid state as PROTINFO */ |
| 160 | if (rta[IFLA_PROTINFO-1]) { |
| 161 | u8 *pstate = RTA_DATA(rta[IFLA_PROTINFO-1]); |
| 162 | new_state = *pstate; |
| 163 | } else |
| 164 | return -EINVAL; |
| 165 | |
| 166 | if (new_state > BR_STATE_BLOCKING) |
| 167 | return -EINVAL; |
| 168 | |
| 169 | /* Find bridge port */ |
| 170 | dev = __dev_get_by_index(ifm->ifi_index); |
| 171 | if (!dev) |
| 172 | return -ENODEV; |
| 173 | |
| 174 | p = dev->br_port; |
| 175 | if (!p) |
| 176 | return -EINVAL; |
| 177 | |
| 178 | /* if kernel STP is running, don't allow changes */ |
| 179 | if (p->br->stp_enabled) |
| 180 | return -EBUSY; |
| 181 | |
| 182 | if (!netif_running(dev)) |
| 183 | return -ENETDOWN; |
| 184 | |
| 185 | if (!netif_carrier_ok(dev) && new_state != BR_STATE_DISABLED) |
| 186 | return -ENETDOWN; |
| 187 | |
| 188 | p->state = new_state; |
| 189 | br_log_state(p); |
| 190 | return 0; |
| 191 | } |
| 192 | |
| 193 | |
| 194 | static struct rtnetlink_link bridge_rtnetlink_table[RTM_NR_MSGTYPES] = { |
| 195 | [RTM_GETLINK - RTM_BASE] = { .dumpit = br_dump_ifinfo, }, |
| 196 | [RTM_SETLINK - RTM_BASE] = { .doit = br_rtm_setlink, }, |
| 197 | }; |
| 198 | |
| 199 | void __init br_netlink_init(void) |
| 200 | { |
| 201 | rtnetlink_links[PF_BRIDGE] = bridge_rtnetlink_table; |
| 202 | } |
| 203 | |
| 204 | void __exit br_netlink_fini(void) |
| 205 | { |
| 206 | rtnetlink_links[PF_BRIDGE] = NULL; |
| 207 | } |
| 208 | |