/* * net/drivers/team/team.c - Network team device driver * Copyright (c) 2011 Jiri Pirko * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DRV_NAME "team" /********** * Helpers **********/ #define team_port_exists(dev) (dev->priv_flags & IFF_TEAM_PORT) static struct team_port *team_port_get_rcu(const struct net_device *dev) { struct team_port *port = rcu_dereference(dev->rx_handler_data); return team_port_exists(dev) ? port : NULL; } static struct team_port *team_port_get_rtnl(const struct net_device *dev) { struct team_port *port = rtnl_dereference(dev->rx_handler_data); return team_port_exists(dev) ? port : NULL; } /* * Since the ability to change mac address for open port device is tested in * team_port_add, this function can be called without control of return value */ static int __set_port_mac(struct net_device *port_dev, const unsigned char *dev_addr) { struct sockaddr addr; memcpy(addr.sa_data, dev_addr, ETH_ALEN); addr.sa_family = ARPHRD_ETHER; return dev_set_mac_address(port_dev, &addr); } int team_port_set_orig_mac(struct team_port *port) { return __set_port_mac(port->dev, port->orig.dev_addr); } int team_port_set_team_mac(struct team_port *port) { return __set_port_mac(port->dev, port->team->dev->dev_addr); } EXPORT_SYMBOL(team_port_set_team_mac); /******************* * Options handling *******************/ struct team_option *__team_find_option(struct team *team, const char *opt_name) { struct team_option *option; list_for_each_entry(option, &team->option_list, list) { if (strcmp(option->name, opt_name) == 0) return option; } return NULL; } int team_options_register(struct team *team, const struct team_option *option, size_t option_count) { int i; struct team_option **dst_opts; int err; dst_opts = kzalloc(sizeof(struct team_option *) * option_count, GFP_KERNEL); if (!dst_opts) return -ENOMEM; for (i = 0; i < option_count; i++, option++) { if (__team_find_option(team, option->name)) { err = -EEXIST; goto rollback; } dst_opts[i] = kmemdup(option, sizeof(*option), GFP_KERNEL); if (!dst_opts[i]) { err = -ENOMEM; goto rollback; } } for (i = 0; i < option_count; i++) list_add_tail(&dst_opts[i]->list, &team->option_list); kfree(dst_opts); return 0; rollback: for (i = 0; i < option_count; i++) kfree(dst_opts[i]); kfree(dst_opts); return err; } EXPORT_SYMBOL(team_options_register); static void __team_options_change_check(struct team *team, struct team_option *changed_option); static void __team_options_unregister(struct team *team, const struct team_option *option, size_t option_count) { int i; for (i = 0; i < option_count; i++, option++) { struct team_option *del_opt; del_opt = __team_find_option(team, option->name); if (del_opt) { list_del(&del_opt->list); kfree(del_opt); } } } void team_options_unregister(struct team *team, const struct team_option *option, size_t option_count) { __team_options_unregister(team, option, option_count); __team_options_change_check(team, NULL); } EXPORT_SYMBOL(team_options_unregister); static int team_option_get(struct team *team, struct team_option *option, void *arg) { return option->getter(team, arg); } static int team_option_set(struct team *team, struct team_option *option, void *arg) { int err; err = option->setter(team, arg); if (err) return err; __team_options_change_check(team, option); return err; } /**************** * Mode handling ****************/ static LIST_HEAD(mode_list); static DEFINE_SPINLOCK(mode_list_lock); static struct team_mode *__find_mode(const char *kind) { struct team_mode *mode; list_for_each_entry(mode, &mode_list, list) { if (strcmp(mode->kind, kind) == 0) return mode; } return NULL; } static bool is_good_mode_name(const char *name) { while (*name != '\0') { if (!isalpha(*name) && !isdigit(*name) && *name != '_') return false; name++; } return true; } int team_mode_register(struct team_mode *mode) { int err = 0; if (!is_good_mode_name(mode->kind) || mode->priv_size > TEAM_MODE_PRIV_SIZE) return -EINVAL; spin_lock(&mode_list_lock); if (__find_mode(mode->kind)) { err = -EEXIST; goto unlock; } list_add_tail(&mode->list, &mode_list); unlock: spin_unlock(&mode_list_lock); return err; } EXPORT_SYMBOL(team_mode_register); int team_mode_unregister(struct team_mode *mode) { spin_lock(&mode_list_lock); list_del_init(&mode->list); spin_unlock(&mode_list_lock); return 0; } EXPORT_SYMBOL(team_mode_unregister); static struct team_mode *team_mode_get(const char *kind) { struct team_mode *mode; spin_lock(&mode_list_lock); mode = __find_mode(kind); if (!mode) { spin_unlock(&mode_list_lock); request_module("team-mode-%s", kind); spin_lock(&mode_list_lock); mode = __find_mode(kind); } if (mode) if (!try_module_get(mode->owner)) mode = NULL; spin_unlock(&mode_list_lock); return mode; } static void team_mode_put(const struct team_mode *mode) { module_put(mode->owner); } static bool team_dummy_transmit(struct team *team, struct sk_buff *skb) { dev_kfree_skb_any(skb); return false; } rx_handler_result_t team_dummy_receive(struct team *team, struct team_port *port, struct sk_buff *skb) { return RX_HANDLER_ANOTHER; } static void team_adjust_ops(struct team *team) { /* * To avoid checks in rx/tx skb paths, ensure here that non-null and * correct ops are always set. */ if (list_empty(&team->port_list) || !team->mode || !team->mode->ops->transmit) team->ops.transmit = team_dummy_transmit; else team->ops.transmit = team->mode->ops->transmit; if (list_empty(&team->port_list) || !team->mode || !team->mode->ops->receive) team->ops.receive = team_dummy_receive; else team->ops.receive = team->mode->ops->receive; } /* * We can benefit from the fact that it's ensured no port is present * at the time of mode change. Therefore no packets are in fly so there's no * need to set mode operations in any special way. */ static int __team_change_mode(struct team *team, const struct team_mode *new_mode) { /* Check if mode was previously set and do cleanup if so */ if (team->mode) { void (*exit_op)(struct team *team) = team->ops.exit; /* Clear ops area so no callback is called any longer */ memset(&team->ops, 0, sizeof(struct team_mode_ops)); team_adjust_ops(team); if (exit_op) exit_op(team); team_mode_put(team->mode); team->mode = NULL; /* zero private data area */ memset(&team->mode_priv, 0, sizeof(struct team) - offsetof(struct team, mode_priv)); } if (!new_mode) return 0; if (new_mode->ops->init) { int err; err = new_mode->ops->init(team); if (err) return err; } team->mode = new_mode; memcpy(&team->ops, new_mode->ops, sizeof(struct team_mode_ops)); team_adjust_ops(team); return 0; } static int team_change_mode(struct team *team, const char *kind) { struct team_mode *new_mode; struct net_device *dev = team->dev; int err; if (!list_empty(&team->port_list)) { netdev_err(dev, "No ports can be present during mode change\n"); return -EBUSY; } if (team->mode && strcmp(team->mode->kind, kind) == 0) { netdev_err(dev, "Unable to change to the same mode the team is in\n"); return -EINVAL; } new_mode = team_mode_get(kind); if (!new_mode) { netdev_err(dev, "Mode \"%s\" not found\n", kind); return -EINVAL; } err = __team_change_mode(team, new_mode); if (err) { netdev_err(dev, "Failed to change to mode \"%s\"\n", kind); team_mode_put(new_mode); return err; } netdev_info(dev, "Mode changed to \"%s\"\n", kind); return 0; } /************************ * Rx path frame handler ************************/ /* note: already called with rcu_read_lock */ static rx_handler_result_t team_handle_frame(struct sk_buff **pskb) { struct sk_buff *skb = *pskb; struct team_port *port; struct team *team; rx_handler_result_t res; skb = skb_share_check(skb, GFP_ATOMIC); if (!skb) return RX_HANDLER_CONSUMED; *pskb = skb; port = team_port_get_rcu(skb->dev); team = port->team; res = team->ops.receive(team, port, skb); if (res == RX_HANDLER_ANOTHER) { struct team_pcpu_stats *pcpu_stats; pcpu_stats = this_cpu_ptr(team->pcpu_stats); u64_stats_update_begin(&pcpu_stats->syncp); pcpu_stats->rx_packets++; pcpu_stats->rx_bytes += skb->len; if (skb->pkt_type == PACKET_MULTICAST) pcpu_stats->rx_multicast++; u64_stats_update_end(&pcpu_stats->syncp); skb->dev = team->dev; } else { this_cpu_inc(team->pcpu_stats->rx_dropped); } return res; } /**************** * Port handling ****************/ static bool team_port_find(const struct team *team, const struct team_port *port) { struct team_port *cur; list_for_each_entry(cur, &team->port_list, list) if (cur == port) return true; return false; } /* * Add/delete port to the team port list. Write guarded by rtnl_lock. * Takes care of correct port->index setup (might be racy). */ static void team_port_list_add_port(struct team *team, struct team_port *port) { port->index = team->port_count++; hlist_add_head_rcu(&port->hlist, team_port_index_hash(team, port->index)); list_add_tail_rcu(&port->list, &team->port_list); } static void __reconstruct_port_hlist(struct team *team, int rm_index) { int i; struct team_port *port; for (i = rm_index + 1; i < team->port_count; i++) { port = team_get_port_by_index(team, i); hlist_del_rcu(&port->hlist); port->index--; hlist_add_head_rcu(&port->hlist, team_port_index_hash(team, port->index)); } } static void team_port_list_del_port(struct team *team, struct team_port *port) { int rm_index = port->index; hlist_del_rcu(&port->hlist); list_del_rcu(&port->list); __reconstruct_port_hlist(team, rm_index); team->port_count--; } #define TEAM_VLAN_FEATURES (NETIF_F_ALL_CSUM | NETIF_F_SG | \ NETIF_F_FRAGLIST | NETIF_F_ALL_TSO | \ NETIF_F_HIGHDMA | NETIF_F_LRO) static void __team_compute_features(struct team *team) { struct team_port *port; u32 vlan_features = TEAM_VLAN_FEATURES; unsigned short max_hard_header_len = ETH_HLEN; list_for_each_entry(port, &team->port_list, list) { vlan_features = netdev_increment_features(vlan_features, port->dev->vlan_features, TEAM_VLAN_FEATURES); if (port->dev->hard_header_len > max_hard_header_len) max_hard_header_len = port->dev->hard_header_len; } team->dev->vlan_features = vlan_features; team->dev->hard_header_len = max_hard_header_len; netdev_change_features(team->dev); } static void team_compute_features(struct team *team) { mutex_lock(&team->lock); __team_compute_features(team); mutex_unlock(&team->lock); } static int team_port_enter(struct team *team, struct team_port *port) { int err = 0; dev_hold(team->dev); port->dev->priv_flags |= IFF_TEAM_PORT; if (team->ops.port_enter) { err = team->ops.port_enter(team, port); if (err) { netdev_err(team->dev, "Device %s failed to enter team mode\n", port->dev->name); goto err_port_enter; } } return 0; err_port_enter: port->dev->priv_flags &= ~IFF_TEAM_PORT; dev_put(team->dev); return err; } static void team_port_leave(struct team *team, struct team_port *port) { if (team->ops.port_leave) team->ops.port_leave(team, port); port->dev->priv_flags &= ~IFF_TEAM_PORT; dev_put(team->dev); } static void __team_port_change_check(struct team_port *port, bool linkup); static int team_port_add(struct team *team, struct net_device *port_dev) { struct net_device *dev = team->dev; struct team_port *port; char *portname = port_dev->name; int err; if (port_dev->flags & IFF_LOOPBACK || port_dev->type != ARPHRD_ETHER) { netdev_err(dev, "Device %s is of an unsupported type\n", portname); return -EINVAL; } if (team_port_exists(port_dev)) { netdev_err(dev, "Device %s is already a port " "of a team device\n", portname); return -EBUSY; } if (port_dev->flags & IFF_UP) { netdev_err(dev, "Device %s is up. Set it down before adding it as a team port\n", portname); return -EBUSY; } port = kzalloc(sizeof(struct team_port), GFP_KERNEL); if (!port) return -ENOMEM; port->dev = port_dev; port->team = team; port->orig.mtu = port_dev->mtu; err = dev_set_mtu(port_dev, dev->mtu); if (err) { netdev_dbg(dev, "Error %d calling dev_set_mtu\n", err); goto err_set_mtu; } memcpy(port->orig.dev_addr, port_dev->dev_addr, ETH_ALEN); err = team_port_enter(team, port); if (err) { netdev_err(dev, "Device %s failed to enter team mode\n", portname); goto err_port_enter; } err = dev_open(port_dev); if (err) { netdev_dbg(dev, "Device %s opening failed\n", portname); goto err_dev_open; } err = vlan_vids_add_by_dev(port_dev, dev); if (err) { netdev_err(dev, "Failed to add vlan ids to device %s\n", portname); goto err_vids_add; } err = netdev_set_master(port_dev, dev); if (err) { netdev_err(dev, "Device %s failed to set master\n", portname); goto err_set_master; } err = netdev_rx_handler_register(port_dev, team_handle_frame, port); if (err) { netdev_err(dev, "Device %s failed to register rx_handler\n", portname); goto err_handler_register; } team_port_list_add_port(team, port); team_adjust_ops(team); __team_compute_features(team); __team_port_change_check(port, !!netif_carrier_ok(port_dev)); netdev_info(dev, "Port device %s added\n", portname); return 0; err_handler_register: netdev_set_master(port_dev, NULL); err_set_master: vlan_vids_del_by_dev(port_dev, dev); err_vids_add: dev_close(port_dev); err_dev_open: team_port_leave(team, port); team_port_set_orig_mac(port); err_port_enter: dev_set_mtu(port_dev, port->orig.mtu); err_set_mtu: kfree(port); return err; } static int team_port_del(struct team *team, struct net_device *port_dev) { struct net_device *dev = team->dev; struct team_port *port; char *portname = port_dev->name; port = team_port_get_rtnl(port_dev); if (!port || !team_port_find(team, port)) { netdev_err(dev, "Device %s does not act as a port of this team\n", portname); return -ENOENT; } __team_port_change_check(port, false); team_port_list_del_port(team, port); team_adjust_ops(team); netdev_rx_handler_unregister(port_dev); netdev_set_master(port_dev, NULL); vlan_vids_del_by_dev(port_dev, dev); dev_close(port_dev); team_port_leave(team, port); team_port_set_orig_mac(port); dev_set_mtu(port_dev, port->orig.mtu); synchronize_rcu(); kfree(port); netdev_info(dev, "Port device %s removed\n", portname); __team_compute_features(team); return 0; } /***************** * Net device ops *****************/ static const char team_no_mode_kind[] = "*NOMODE*"; static int team_mode_option_get(struct team *team, void *arg) { const char **str = arg; *str = team->mode ? team->mode->kind : team_no_mode_kind; return 0; } static int team_mode_option_set(struct team *team, void *arg) { const char **str = arg; return team_change_mode(team, *str); } static const struct team_option team_options[] = { { .name = "mode", .type = TEAM_OPTION_TYPE_STRING, .getter = team_mode_option_get, .setter = team_mode_option_set, }, }; static int team_init(struct net_device *dev) { struct team *team = netdev_priv(dev); int i; int err; team->dev = dev; mutex_init(&team->lock); team->pcpu_stats = alloc_percpu(struct team_pcpu_stats); if (!team->pcpu_stats) return -ENOMEM; for (i = 0; i < TEAM_PORT_HASHENTRIES; i++) INIT_HLIST_HEAD(&team->port_hlist[i]); INIT_LIST_HEAD(&team->port_list); team_adjust_ops(team); INIT_LIST_HEAD(&team->option_list); err = team_options_register(team, team_options, ARRAY_SIZE(team_options)); if (err) goto err_options_register; netif_carrier_off(dev); return 0; err_options_register: free_percpu(team->pcpu_stats); return err; } static void team_uninit(struct net_device *dev) { struct team *team = netdev_priv(dev); struct team_port *port; struct team_port *tmp; mutex_lock(&team->lock); list_for_each_entry_safe(port, tmp, &team->port_list, list) team_port_del(team, port->dev); __team_change_mode(team, NULL); /* cleanup */ __team_options_unregister(team, team_options, ARRAY_SIZE(team_options)); mutex_unlock(&team->lock); } static void team_destructor(struct net_device *dev) { struct team *team = netdev_priv(dev); free_percpu(team->pcpu_stats); free_netdev(dev); } static int team_open(struct net_device *dev) { netif_carrier_on(dev); return 0; } static int team_close(struct net_device *dev) { netif_carrier_off(dev); return 0; } /* * note: already called with rcu_read_lock */ static netdev_tx_t team_xmit(struct sk_buff *skb, struct net_device *dev) { struct team *team = netdev_priv(dev); bool tx_success = false; unsigned int len = skb->len; tx_success = team->ops.transmit(team, skb); if (tx_success) { struct team_pcpu_stats *pcpu_stats; pcpu_stats = this_cpu_ptr(team->pcpu_stats); u64_stats_update_begin(&pcpu_stats->syncp); pcpu_stats->tx_packets++; pcpu_stats->tx_bytes += len; u64_stats_update_end(&pcpu_stats->syncp); } else { this_cpu_inc(team->pcpu_stats->tx_dropped); } return NETDEV_TX_OK; } static void team_change_rx_flags(struct net_device *dev, int change) { struct team *team = netdev_priv(dev); struct team_port *port; int inc; rcu_read_lock(); list_for_each_entry_rcu(port, &team->port_list, list) { if (change & IFF_PROMISC) { inc = dev->flags & IFF_PROMISC ? 1 : -1; dev_set_promiscuity(port->dev, inc); } if (change & IFF_ALLMULTI) { inc = dev->flags & IFF_ALLMULTI ? 1 : -1; dev_set_allmulti(port->dev, inc); } } rcu_read_unlock(); } static void team_set_rx_mode(struct net_device *dev) { struct team *team = netdev_priv(dev); struct team_port *port; rcu_read_lock(); list_for_each_entry_rcu(port, &team->port_list, list) { dev_uc_sync(port->dev, dev); dev_mc_sync(port->dev, dev); } rcu_read_unlock(); } static int team_set_mac_address(struct net_device *dev, void *p) { struct team *team = netdev_priv(dev); struct team_port *port; struct sockaddr *addr = p; memcpy(dev->dev_addr, addr->sa_data, ETH_ALEN); rcu_read_lock(); list_for_each_entry_rcu(port, &team->port_list, list) if (team->ops.port_change_mac) team->ops.port_change_mac(team, port); rcu_read_unlock(); return 0; } static int team_change_mtu(struct net_device *dev, int new_mtu) { struct team *team = netdev_priv(dev); struct team_port *port; int err; /* * Alhough this is reader, it's guarded by team lock. It's not possible * to traverse list in reverse under rcu_read_lock */ mutex_lock(&team->lock); list_for_each_entry(port, &team->port_list, list) { err = dev_set_mtu(port->dev, new_mtu); if (err) { netdev_err(dev, "Device %s failed to change mtu", port->dev->name); goto unwind; } } mutex_unlock(&team->lock); dev->mtu = new_mtu; return 0; unwind: list_for_each_entry_continue_reverse(port, &team->port_list, list) dev_set_mtu(port->dev, dev->mtu); mutex_unlock(&team->lock); return err; } static struct rtnl_link_stats64 * team_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats) { struct team *team = netdev_priv(dev); struct team_pcpu_stats *p; u64 rx_packets, rx_bytes, rx_multicast, tx_packets, tx_bytes; u32 rx_dropped = 0, tx_dropped = 0; unsigned int start; int i; for_each_possible_cpu(i) { p = per_cpu_ptr(team->pcpu_stats, i); do { start = u64_stats_fetch_begin_bh(&p->syncp); rx_packets = p->rx_packets; rx_bytes = p->rx_bytes; rx_multicast = p->rx_multicast; tx_packets = p->tx_packets; tx_bytes = p->tx_bytes; } while (u64_stats_fetch_retry_bh(&p->syncp, start)); stats->rx_packets += rx_packets; stats->rx_bytes += rx_bytes; stats->multicast += rx_multicast; stats->tx_packets += tx_packets; stats->tx_bytes += tx_bytes; /* * rx_dropped & tx_dropped are u32, updated * without syncp protection. */ rx_dropped += p->rx_dropped; tx_dropped += p->tx_dropped; } stats->rx_dropped = rx_dropped; stats->tx_dropped = tx_dropped; return stats; } static int team_vlan_rx_add_vid(struct net_device *dev, uint16_t vid) { struct team *team = netdev_priv(dev); struct team_port *port; int err; /* * Alhough this is reader, it's guarded by team lock. It's not possible * to traverse list in reverse under rcu_read_lock */ mutex_lock(&team->lock); list_for_each_entry(port, &team->port_list, list) { err = vlan_vid_add(port->dev, vid); if (err) goto unwind; } mutex_unlock(&team->lock); return 0; unwind: list_for_each_entry_continue_reverse(port, &team->port_list, list) vlan_vid_del(port->dev, vid); mutex_unlock(&team->lock); return err; } static int team_vlan_rx_kill_vid(struct net_device *dev, uint16_t vid) { struct team *team = netdev_priv(dev); struct team_port *port; rcu_read_lock(); list_for_each_entry_rcu(port, &team->port_list, list) vlan_vid_del(port->dev, vid); rcu_read_unlock(); return 0; } static int team_add_slave(struct net_device *dev, struct net_device *port_dev) { struct team *team = netdev_priv(dev); int err; mutex_lock(&team->lock); err = team_port_add(team, port_dev); mutex_unlock(&team->lock); return err; } static int team_del_slave(struct net_device *dev, struct net_device *port_dev) { struct team *team = netdev_priv(dev); int err; mutex_lock(&team->lock); err = team_port_del(team, port_dev); mutex_unlock(&team->lock); return err; } static netdev_features_t team_fix_features(struct net_device *dev, netdev_features_t features) { struct team_port *port; struct team *team = netdev_priv(dev); netdev_features_t mask; mask = features; features &= ~NETIF_F_ONE_FOR_ALL; features |= NETIF_F_ALL_FOR_ALL; rcu_read_lock(); list_for_each_entry_rcu(port, &team->port_list, list) { features = netdev_increment_features(features, port->dev->features, mask); } rcu_read_unlock(); return features; } static const struct net_device_ops team_netdev_ops = { .ndo_init = team_init, .ndo_uninit = team_uninit, .ndo_open = team_open, .ndo_stop = team_close, .ndo_start_xmit = team_xmit, .ndo_change_rx_flags = team_change_rx_flags, .ndo_set_rx_mode = team_set_rx_mode, .ndo_set_mac_address = team_set_mac_address, .ndo_change_mtu = team_change_mtu, .ndo_get_stats64 = team_get_stats64, .ndo_vlan_rx_add_vid = team_vlan_rx_add_vid, .ndo_vlan_rx_kill_vid = team_vlan_rx_kill_vid, .ndo_add_slave = team_add_slave, .ndo_del_slave = team_del_slave, .ndo_fix_features = team_fix_features, }; /*********************** * rt netlink interface ***********************/ static void team_setup(struct net_device *dev) { ether_setup(dev); dev->netdev_ops = &team_netdev_ops; dev->destructor = team_destructor; dev->tx_queue_len = 0; dev->flags |= IFF_MULTICAST; dev->priv_flags &= ~(IFF_XMIT_DST_RELEASE | IFF_TX_SKB_SHARING); /* * Indicate we support unicast address filtering. That way core won't * bring us to promisc mode in case a unicast addr is added. * Let this up to underlay drivers. */ dev->priv_flags |= IFF_UNICAST_FLT; dev->features |= NETIF_F_LLTX; dev->features |= NETIF_F_GRO; dev->hw_features = NETIF_F_HW_VLAN_TX | NETIF_F_HW_VLAN_RX | NETIF_F_HW_VLAN_FILTER; dev->features |= dev->hw_features; } static int team_newlink(struct net *src_net, struct net_device *dev, struct nlattr *tb[], struct nlattr *data[]) { int err; if (tb[IFLA_ADDRESS] == NULL) random_ether_addr(dev->dev_addr); err = register_netdevice(dev); if (err) return err; return 0; } static int team_validate(struct nlattr *tb[], struct nlattr *data[]) { if (tb[IFLA_ADDRESS]) { if (nla_len(tb[IFLA_ADDRESS]) != ETH_ALEN) return -EINVAL; if (!is_valid_ether_addr(nla_data(tb[IFLA_ADDRESS]))) return -EADDRNOTAVAIL; } return 0; } static struct rtnl_link_ops team_link_ops __read_mostly = { .kind = DRV_NAME, .priv_size = sizeof(struct team), .setup = team_setup, .newlink = team_newlink, .validate = team_validate, }; /*********************************** * Generic netlink custom interface ***********************************/ static struct genl_family team_nl_family = { .id = GENL_ID_GENERATE, .name = TEAM_GENL_NAME, .version = TEAM_GENL_VERSION, .maxattr = TEAM_ATTR_MAX, .netnsok = true, }; static const struct nla_policy team_nl_policy[TEAM_ATTR_MAX + 1] = { [TEAM_ATTR_UNSPEC] = { .type = NLA_UNSPEC, }, [TEAM_ATTR_TEAM_IFINDEX] = { .type = NLA_U32 }, [TEAM_ATTR_LIST_OPTION] = { .type = NLA_NESTED }, [TEAM_ATTR_LIST_PORT] = { .type = NLA_NESTED }, }; static const struct nla_policy team_nl_option_policy[TEAM_ATTR_OPTION_MAX + 1] = { [TEAM_ATTR_OPTION_UNSPEC] = { .type = NLA_UNSPEC, }, [TEAM_ATTR_OPTION_NAME] = { .type = NLA_STRING, .len = TEAM_STRING_MAX_LEN, }, [TEAM_ATTR_OPTION_CHANGED] = { .type = NLA_FLAG }, [TEAM_ATTR_OPTION_TYPE] = { .type = NLA_U8 }, [TEAM_ATTR_OPTION_DATA] = { .type = NLA_BINARY, .len = TEAM_STRING_MAX_LEN, }, }; static int team_nl_cmd_noop(struct sk_buff *skb, struct genl_info *info) { struct sk_buff *msg; void *hdr; int err; msg = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); if (!msg) return -ENOMEM; hdr = genlmsg_put(msg, info->snd_pid, info->snd_seq, &team_nl_family, 0, TEAM_CMD_NOOP); if (IS_ERR(hdr)) { err = PTR_ERR(hdr); goto err_msg_put; } genlmsg_end(msg, hdr); return genlmsg_unicast(genl_info_net(info), msg, info->snd_pid); err_msg_put: nlmsg_free(msg); return err; } /* * Netlink cmd functions should be locked by following two functions. * Since dev gets held here, that ensures dev won't disappear in between. */ static struct team *team_nl_team_get(struct genl_info *info) { struct net *net = genl_info_net(info); int ifindex; struct net_device *dev; struct team *team; if (!info->attrs[TEAM_ATTR_TEAM_IFINDEX]) return NULL; ifindex = nla_get_u32(info->attrs[TEAM_ATTR_TEAM_IFINDEX]); dev = dev_get_by_index(net, ifindex); if (!dev || dev->netdev_ops != &team_netdev_ops) { if (dev) dev_put(dev); return NULL; } team = netdev_priv(dev); mutex_lock(&team->lock); return team; } static void team_nl_team_put(struct team *team) { mutex_unlock(&team->lock); dev_put(team->dev); } static int team_nl_send_generic(struct genl_info *info, struct team *team, int (*fill_func)(struct sk_buff *skb, struct genl_info *info, int flags, struct team *team)) { struct sk_buff *skb; int err; skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) return -ENOMEM; err = fill_func(skb, info, NLM_F_ACK, team); if (err < 0) goto err_fill; err = genlmsg_unicast(genl_info_net(info), skb, info->snd_pid); return err; err_fill: nlmsg_free(skb); return err; } static int team_nl_fill_options_get_changed(struct sk_buff *skb, u32 pid, u32 seq, int flags, struct team *team, struct team_option *changed_option) { struct nlattr *option_list; void *hdr; struct team_option *option; hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags, TEAM_CMD_OPTIONS_GET); if (IS_ERR(hdr)) return PTR_ERR(hdr); NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex); option_list = nla_nest_start(skb, TEAM_ATTR_LIST_OPTION); if (!option_list) return -EMSGSIZE; list_for_each_entry(option, &team->option_list, list) { struct nlattr *option_item; long arg; option_item = nla_nest_start(skb, TEAM_ATTR_ITEM_OPTION); if (!option_item) goto nla_put_failure; NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_NAME, option->name); if (option == changed_option) NLA_PUT_FLAG(skb, TEAM_ATTR_OPTION_CHANGED); switch (option->type) { case TEAM_OPTION_TYPE_U32: NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_U32); team_option_get(team, option, &arg); NLA_PUT_U32(skb, TEAM_ATTR_OPTION_DATA, arg); break; case TEAM_OPTION_TYPE_STRING: NLA_PUT_U8(skb, TEAM_ATTR_OPTION_TYPE, NLA_STRING); team_option_get(team, option, &arg); NLA_PUT_STRING(skb, TEAM_ATTR_OPTION_DATA, (char *) arg); break; default: BUG(); } nla_nest_end(skb, option_item); } nla_nest_end(skb, option_list); return genlmsg_end(skb, hdr); nla_put_failure: genlmsg_cancel(skb, hdr); return -EMSGSIZE; } static int team_nl_fill_options_get(struct sk_buff *skb, struct genl_info *info, int flags, struct team *team) { return team_nl_fill_options_get_changed(skb, info->snd_pid, info->snd_seq, NLM_F_ACK, team, NULL); } static int team_nl_cmd_options_get(struct sk_buff *skb, struct genl_info *info) { struct team *team; int err; team = team_nl_team_get(info); if (!team) return -EINVAL; err = team_nl_send_generic(info, team, team_nl_fill_options_get); team_nl_team_put(team); return err; } static int team_nl_cmd_options_set(struct sk_buff *skb, struct genl_info *info) { struct team *team; int err = 0; int i; struct nlattr *nl_option; team = team_nl_team_get(info); if (!team) return -EINVAL; err = -EINVAL; if (!info->attrs[TEAM_ATTR_LIST_OPTION]) { err = -EINVAL; goto team_put; } nla_for_each_nested(nl_option, info->attrs[TEAM_ATTR_LIST_OPTION], i) { struct nlattr *mode_attrs[TEAM_ATTR_OPTION_MAX + 1]; enum team_option_type opt_type; struct team_option *option; char *opt_name; bool opt_found = false; if (nla_type(nl_option) != TEAM_ATTR_ITEM_OPTION) { err = -EINVAL; goto team_put; } err = nla_parse_nested(mode_attrs, TEAM_ATTR_OPTION_MAX, nl_option, team_nl_option_policy); if (err) goto team_put; if (!mode_attrs[TEAM_ATTR_OPTION_NAME] || !mode_attrs[TEAM_ATTR_OPTION_TYPE] || !mode_attrs[TEAM_ATTR_OPTION_DATA]) { err = -EINVAL; goto team_put; } switch (nla_get_u8(mode_attrs[TEAM_ATTR_OPTION_TYPE])) { case NLA_U32: opt_type = TEAM_OPTION_TYPE_U32; break; case NLA_STRING: opt_type = TEAM_OPTION_TYPE_STRING; break; default: goto team_put; } opt_name = nla_data(mode_attrs[TEAM_ATTR_OPTION_NAME]); list_for_each_entry(option, &team->option_list, list) { long arg; struct nlattr *opt_data_attr; if (option->type != opt_type || strcmp(option->name, opt_name)) continue; opt_found = true; opt_data_attr = mode_attrs[TEAM_ATTR_OPTION_DATA]; switch (opt_type) { case TEAM_OPTION_TYPE_U32: arg = nla_get_u32(opt_data_attr); break; case TEAM_OPTION_TYPE_STRING: arg = (long) nla_data(opt_data_attr); break; default: BUG(); } err = team_option_set(team, option, &arg); if (err) goto team_put; } if (!opt_found) { err = -ENOENT; goto team_put; } } team_put: team_nl_team_put(team); return err; } static int team_nl_fill_port_list_get_changed(struct sk_buff *skb, u32 pid, u32 seq, int flags, struct team *team, struct team_port *changed_port) { struct nlattr *port_list; void *hdr; struct team_port *port; hdr = genlmsg_put(skb, pid, seq, &team_nl_family, flags, TEAM_CMD_PORT_LIST_GET); if (IS_ERR(hdr)) return PTR_ERR(hdr); NLA_PUT_U32(skb, TEAM_ATTR_TEAM_IFINDEX, team->dev->ifindex); port_list = nla_nest_start(skb, TEAM_ATTR_LIST_PORT); if (!port_list) return -EMSGSIZE; list_for_each_entry(port, &team->port_list, list) { struct nlattr *port_item; port_item = nla_nest_start(skb, TEAM_ATTR_ITEM_PORT); if (!port_item) goto nla_put_failure; NLA_PUT_U32(skb, TEAM_ATTR_PORT_IFINDEX, port->dev->ifindex); if (port == changed_port) NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_CHANGED); if (port->linkup) NLA_PUT_FLAG(skb, TEAM_ATTR_PORT_LINKUP); NLA_PUT_U32(skb, TEAM_ATTR_PORT_SPEED, port->speed); NLA_PUT_U8(skb, TEAM_ATTR_PORT_DUPLEX, port->duplex); nla_nest_end(skb, port_item); } nla_nest_end(skb, port_list); return genlmsg_end(skb, hdr); nla_put_failure: genlmsg_cancel(skb, hdr); return -EMSGSIZE; } static int team_nl_fill_port_list_get(struct sk_buff *skb, struct genl_info *info, int flags, struct team *team) { return team_nl_fill_port_list_get_changed(skb, info->snd_pid, info->snd_seq, NLM_F_ACK, team, NULL); } static int team_nl_cmd_port_list_get(struct sk_buff *skb, struct genl_info *info) { struct team *team; int err; team = team_nl_team_get(info); if (!team) return -EINVAL; err = team_nl_send_generic(info, team, team_nl_fill_port_list_get); team_nl_team_put(team); return err; } static struct genl_ops team_nl_ops[] = { { .cmd = TEAM_CMD_NOOP, .doit = team_nl_cmd_noop, .policy = team_nl_policy, }, { .cmd = TEAM_CMD_OPTIONS_SET, .doit = team_nl_cmd_options_set, .policy = team_nl_policy, .flags = GENL_ADMIN_PERM, }, { .cmd = TEAM_CMD_OPTIONS_GET, .doit = team_nl_cmd_options_get, .policy = team_nl_policy, .flags = GENL_ADMIN_PERM, }, { .cmd = TEAM_CMD_PORT_LIST_GET, .doit = team_nl_cmd_port_list_get, .policy = team_nl_policy, .flags = GENL_ADMIN_PERM, }, }; static struct genl_multicast_group team_change_event_mcgrp = { .name = TEAM_GENL_CHANGE_EVENT_MC_GRP_NAME, }; static int team_nl_send_event_options_get(struct team *team, struct team_option *changed_option) { struct sk_buff *skb; int err; struct net *net = dev_net(team->dev); skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) return -ENOMEM; err = team_nl_fill_options_get_changed(skb, 0, 0, 0, team, changed_option); if (err < 0) goto err_fill; err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id, GFP_KERNEL); return err; err_fill: nlmsg_free(skb); return err; } static int team_nl_send_event_port_list_get(struct team_port *port) { struct sk_buff *skb; int err; struct net *net = dev_net(port->team->dev); skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL); if (!skb) return -ENOMEM; err = team_nl_fill_port_list_get_changed(skb, 0, 0, 0, port->team, port); if (err < 0) goto err_fill; err = genlmsg_multicast_netns(net, skb, 0, team_change_event_mcgrp.id, GFP_KERNEL); return err; err_fill: nlmsg_free(skb); return err; } static int team_nl_init(void) { int err; err = genl_register_family_with_ops(&team_nl_family, team_nl_ops, ARRAY_SIZE(team_nl_ops)); if (err) return err; err = genl_register_mc_group(&team_nl_family, &team_change_event_mcgrp); if (err) goto err_change_event_grp_reg; return 0; err_change_event_grp_reg: genl_unregister_family(&team_nl_family); return err; } static void team_nl_fini(void) { genl_unregister_family(&team_nl_family); } /****************** * Change checkers ******************/ static void __team_options_change_check(struct team *team, struct team_option *changed_option) { int err; err = team_nl_send_event_options_get(team, changed_option); if (err) netdev_warn(team->dev, "Failed to send options change via netlink\n"); } /* rtnl lock is held */ static void __team_port_change_check(struct team_port *port, bool linkup) { int err; if (port->linkup == linkup) return; port->linkup = linkup; if (linkup) { struct ethtool_cmd ecmd; err = __ethtool_get_settings(port->dev, &ecmd); if (!err) { port->speed = ethtool_cmd_speed(&ecmd); port->duplex = ecmd.duplex; goto send_event; } } port->speed = 0; port->duplex = 0; send_event: err = team_nl_send_event_port_list_get(port); if (err) netdev_warn(port->team->dev, "Failed to send port change of device %s via netlink\n", port->dev->name); } static void team_port_change_check(struct team_port *port, bool linkup) { struct team *team = port->team; mutex_lock(&team->lock); __team_port_change_check(port, linkup); mutex_unlock(&team->lock); } /************************************ * Net device notifier event handler ************************************/ static int team_device_event(struct notifier_block *unused, unsigned long event, void *ptr) { struct net_device *dev = (struct net_device *) ptr; struct team_port *port; port = team_port_get_rtnl(dev); if (!port) return NOTIFY_DONE; switch (event) { case NETDEV_UP: if (netif_carrier_ok(dev)) team_port_change_check(port, true); case NETDEV_DOWN: team_port_change_check(port, false); case NETDEV_CHANGE: if (netif_running(port->dev)) team_port_change_check(port, !!netif_carrier_ok(port->dev)); break; case NETDEV_UNREGISTER: team_del_slave(port->team->dev, dev); break; case NETDEV_FEAT_CHANGE: team_compute_features(port->team); break; case NETDEV_CHANGEMTU: /* Forbid to change mtu of underlaying device */ return NOTIFY_BAD; case NETDEV_PRE_TYPE_CHANGE: /* Forbid to change type of underlaying device */ return NOTIFY_BAD; } return NOTIFY_DONE; } static struct notifier_block team_notifier_block __read_mostly = { .notifier_call = team_device_event, }; /*********************** * Module init and exit ***********************/ static int __init team_module_init(void) { int err; register_netdevice_notifier(&team_notifier_block); err = rtnl_link_register(&team_link_ops); if (err) goto err_rtnl_reg; err = team_nl_init(); if (err) goto err_nl_init; return 0; err_nl_init: rtnl_link_unregister(&team_link_ops); err_rtnl_reg: unregister_netdevice_notifier(&team_notifier_block); return err; } static void __exit team_module_exit(void) { team_nl_fini(); rtnl_link_unregister(&team_link_ops); unregister_netdevice_notifier(&team_notifier_block); } module_init(team_module_init); module_exit(team_module_exit); MODULE_LICENSE("GPL v2"); MODULE_AUTHOR("Jiri Pirko "); MODULE_DESCRIPTION("Ethernet team device driver"); MODULE_ALIAS_RTNL_LINK(DRV_NAME);