1 /* 2 * drivers/net/bond/bond_netlink.c - Netlink interface for bonding 3 * Copyright (c) 2013 Jiri Pirko <jiri@resnulli.us> 4 * Copyright (c) 2013 Scott Feldman <sfeldma@cumulusnetworks.com> 5 * 6 * This program is free software; you can redistribute it and/or modify 7 * it under the terms of the GNU General Public License as published by 8 * the Free Software Foundation; either version 2 of the License, or 9 * (at your option) any later version. 10 */ 11 12 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 13 14 #include <linux/module.h> 15 #include <linux/errno.h> 16 #include <linux/netdevice.h> 17 #include <linux/etherdevice.h> 18 #include <linux/if_link.h> 19 #include <linux/if_ether.h> 20 #include <net/netlink.h> 21 #include <net/rtnetlink.h> 22 #include "bonding.h" 23 24 static const struct nla_policy bond_policy[IFLA_BOND_MAX + 1] = { 25 [IFLA_BOND_MODE] = { .type = NLA_U8 }, 26 [IFLA_BOND_ACTIVE_SLAVE] = { .type = NLA_U32 }, 27 [IFLA_BOND_MIIMON] = { .type = NLA_U32 }, 28 [IFLA_BOND_UPDELAY] = { .type = NLA_U32 }, 29 }; 30 31 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 32 { 33 if (tb[IFLA_ADDRESS]) { 34 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 35 return -EINVAL; 36 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 37 return -EADDRNOTAVAIL; 38 } 39 return 0; 40 } 41 42 static int bond_changelink(struct net_device *bond_dev, 43 struct nlattr *tb[], struct nlattr *data[]) 44 { 45 struct bonding *bond = netdev_priv(bond_dev); 46 int err; 47 48 if (!data) 49 return 0; 50 51 if (data[IFLA_BOND_MODE]) { 52 int mode = nla_get_u8(data[IFLA_BOND_MODE]); 53 54 err = bond_option_mode_set(bond, mode); 55 if (err) 56 return err; 57 } 58 if (data[IFLA_BOND_ACTIVE_SLAVE]) { 59 int ifindex = nla_get_u32(data[IFLA_BOND_ACTIVE_SLAVE]); 60 struct net_device *slave_dev; 61 62 if (ifindex == 0) { 63 slave_dev = NULL; 64 } else { 65 slave_dev = __dev_get_by_index(dev_net(bond_dev), 66 ifindex); 67 if (!slave_dev) 68 return -ENODEV; 69 } 70 err = bond_option_active_slave_set(bond, slave_dev); 71 if (err) 72 return err; 73 } 74 if (data[IFLA_BOND_MIIMON]) { 75 int miimon = nla_get_u32(data[IFLA_BOND_MIIMON]); 76 77 err = bond_option_miimon_set(bond, miimon); 78 if (err) 79 return err; 80 } 81 if (data[IFLA_BOND_UPDELAY]) { 82 int updelay = nla_get_u32(data[IFLA_BOND_UPDELAY]); 83 84 err = bond_option_updelay_set(bond, updelay); 85 if (err) 86 return err; 87 } 88 return 0; 89 } 90 91 static int bond_newlink(struct net *src_net, struct net_device *bond_dev, 92 struct nlattr *tb[], struct nlattr *data[]) 93 { 94 int err; 95 96 err = bond_changelink(bond_dev, tb, data); 97 if (err < 0) 98 return err; 99 100 return register_netdevice(bond_dev); 101 } 102 103 static size_t bond_get_size(const struct net_device *bond_dev) 104 { 105 return nla_total_size(sizeof(u8)) + /* IFLA_BOND_MODE */ 106 nla_total_size(sizeof(u32)) + /* IFLA_BOND_ACTIVE_SLAVE */ 107 nla_total_size(sizeof(u32)) + /* IFLA_BOND_MIIMON */ 108 nla_total_size(sizeof(u32)) + /* IFLA_BOND_UPDELAY */ 109 0; 110 } 111 112 static int bond_fill_info(struct sk_buff *skb, 113 const struct net_device *bond_dev) 114 { 115 struct bonding *bond = netdev_priv(bond_dev); 116 struct net_device *slave_dev = bond_option_active_slave_get(bond); 117 118 if (nla_put_u8(skb, IFLA_BOND_MODE, bond->params.mode)) 119 goto nla_put_failure; 120 121 if (slave_dev && 122 nla_put_u32(skb, IFLA_BOND_ACTIVE_SLAVE, slave_dev->ifindex)) 123 goto nla_put_failure; 124 125 if (nla_put_u32(skb, IFLA_BOND_MIIMON, bond->params.miimon)) 126 goto nla_put_failure; 127 128 if (nla_put_u32(skb, IFLA_BOND_UPDELAY, 129 bond->params.updelay * bond->params.miimon)) 130 goto nla_put_failure; 131 132 return 0; 133 134 nla_put_failure: 135 return -EMSGSIZE; 136 } 137 138 struct rtnl_link_ops bond_link_ops __read_mostly = { 139 .kind = "bond", 140 .priv_size = sizeof(struct bonding), 141 .setup = bond_setup, 142 .maxtype = IFLA_BOND_MAX, 143 .policy = bond_policy, 144 .validate = bond_validate, 145 .newlink = bond_newlink, 146 .changelink = bond_changelink, 147 .get_size = bond_get_size, 148 .fill_info = bond_fill_info, 149 .get_num_tx_queues = bond_get_num_tx_queues, 150 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number 151 as for TX queues */ 152 }; 153 154 int __init bond_netlink_init(void) 155 { 156 return rtnl_link_register(&bond_link_ops); 157 } 158 159 void bond_netlink_fini(void) 160 { 161 rtnl_link_unregister(&bond_link_ops); 162 } 163 164 MODULE_ALIAS_RTNL_LINK("bond"); 165