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 }; 29 30 static int bond_validate(struct nlattr *tb[], struct nlattr *data[]) 31 { 32 if (tb[IFLA_ADDRESS]) { 33 if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) 34 return -EINVAL; 35 if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) 36 return -EADDRNOTAVAIL; 37 } 38 return 0; 39 } 40 41 static int bond_changelink(struct net_device *bond_dev, 42 struct nlattr *tb[], struct nlattr *data[]) 43 { 44 struct bonding *bond = netdev_priv(bond_dev); 45 int err; 46 47 if (!data) 48 return 0; 49 50 if (data[IFLA_BOND_MODE]) { 51 int mode = nla_get_u8(data[IFLA_BOND_MODE]); 52 53 err = bond_option_mode_set(bond, mode); 54 if (err) 55 return err; 56 } 57 if (data[IFLA_BOND_ACTIVE_SLAVE]) { 58 int ifindex = nla_get_u32(data[IFLA_BOND_ACTIVE_SLAVE]); 59 struct net_device *slave_dev; 60 61 if (ifindex == 0) { 62 slave_dev = NULL; 63 } else { 64 slave_dev = __dev_get_by_index(dev_net(bond_dev), 65 ifindex); 66 if (!slave_dev) 67 return -ENODEV; 68 } 69 err = bond_option_active_slave_set(bond, slave_dev); 70 if (err) 71 return err; 72 } 73 if (data[IFLA_BOND_MIIMON]) { 74 int miimon = nla_get_u32(data[IFLA_BOND_MIIMON]); 75 76 err = bond_option_miimon_set(bond, miimon); 77 if (err) 78 return err; 79 } 80 return 0; 81 } 82 83 static int bond_newlink(struct net *src_net, struct net_device *bond_dev, 84 struct nlattr *tb[], struct nlattr *data[]) 85 { 86 int err; 87 88 err = bond_changelink(bond_dev, tb, data); 89 if (err < 0) 90 return err; 91 92 return register_netdevice(bond_dev); 93 } 94 95 static size_t bond_get_size(const struct net_device *bond_dev) 96 { 97 return nla_total_size(sizeof(u8)) + /* IFLA_BOND_MODE */ 98 nla_total_size(sizeof(u32)) + /* IFLA_BOND_ACTIVE_SLAVE */ 99 nla_total_size(sizeof(u32)) + /* IFLA_BOND_MIIMON */ 100 0; 101 } 102 103 static int bond_fill_info(struct sk_buff *skb, 104 const struct net_device *bond_dev) 105 { 106 struct bonding *bond = netdev_priv(bond_dev); 107 struct net_device *slave_dev = bond_option_active_slave_get(bond); 108 109 if (nla_put_u8(skb, IFLA_BOND_MODE, bond->params.mode)) 110 goto nla_put_failure; 111 112 if (slave_dev && 113 nla_put_u32(skb, IFLA_BOND_ACTIVE_SLAVE, slave_dev->ifindex)) 114 goto nla_put_failure; 115 116 if (nla_put_u32(skb, IFLA_BOND_MIIMON, bond->params.miimon)) 117 goto nla_put_failure; 118 119 return 0; 120 121 nla_put_failure: 122 return -EMSGSIZE; 123 } 124 125 struct rtnl_link_ops bond_link_ops __read_mostly = { 126 .kind = "bond", 127 .priv_size = sizeof(struct bonding), 128 .setup = bond_setup, 129 .maxtype = IFLA_BOND_MAX, 130 .policy = bond_policy, 131 .validate = bond_validate, 132 .newlink = bond_newlink, 133 .changelink = bond_changelink, 134 .get_size = bond_get_size, 135 .fill_info = bond_fill_info, 136 .get_num_tx_queues = bond_get_num_tx_queues, 137 .get_num_rx_queues = bond_get_num_tx_queues, /* Use the same number 138 as for TX queues */ 139 }; 140 141 int __init bond_netlink_init(void) 142 { 143 return rtnl_link_register(&bond_link_ops); 144 } 145 146 void bond_netlink_fini(void) 147 { 148 rtnl_link_unregister(&bond_link_ops); 149 } 150 151 MODULE_ALIAS_RTNL_LINK("bond"); 152