diff options
Diffstat (limited to 'net/tipc/bearer.c')
| -rw-r--r-- | net/tipc/bearer.c | 342 |
1 files changed, 235 insertions, 107 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 3f9707a16d06..a38c89969c68 100644 --- a/net/tipc/bearer.c +++ b/net/tipc/bearer.c @@ -1,8 +1,8 @@ /* * net/tipc/bearer.c: TIPC bearer code * - * Copyright (c) 1996-2006, Ericsson AB - * Copyright (c) 2004-2006, 2010-2011, Wind River Systems + * Copyright (c) 1996-2006, 2013, Ericsson AB + * Copyright (c) 2004-2006, 2010-2013, Wind River Systems * All rights reserved. * * Redistribution and use in source and binary forms, with or without @@ -41,8 +41,13 @@ #define MAX_ADDR_STR 60 -static struct tipc_media *media_list[MAX_MEDIA]; -static u32 media_count; +static struct tipc_media * const media_info_array[] = { + ð_media_info, +#ifdef CONFIG_TIPC_MEDIA_IB + &ib_media_info, +#endif + NULL +}; struct tipc_bearer tipc_bearers[MAX_BEARERS]; @@ -55,11 +60,11 @@ struct tipc_media *tipc_media_find(const char *name) { u32 i; - for (i = 0; i < media_count; i++) { - if (!strcmp(media_list[i]->name, name)) - return media_list[i]; + for (i = 0; media_info_array[i] != NULL; i++) { + if (!strcmp(media_info_array[i]->name, name)) + break; } - return NULL; + return media_info_array[i]; } /** @@ -69,44 +74,11 @@ static struct tipc_media *media_find_id(u8 type) { u32 i; - for (i = 0; i < media_count; i++) { - if (media_list[i]->type_id == type) - return media_list[i]; + for (i = 0; media_info_array[i] != NULL; i++) { + if (media_info_array[i]->type_id == type) + break; } - return NULL; -} - -/** - * tipc_register_media - register a media type - * - * Bearers for this media type must be activated separately at a later stage. - */ -int tipc_register_media(struct tipc_media *m_ptr) -{ - int res = -EINVAL; - - write_lock_bh(&tipc_net_lock); - - if ((strlen(m_ptr->name) + 1) > TIPC_MAX_MEDIA_NAME) - goto exit; - if (m_ptr->priority > TIPC_MAX_LINK_PRI) - goto exit; - if ((m_ptr->tolerance < TIPC_MIN_LINK_TOL) || - (m_ptr->tolerance > TIPC_MAX_LINK_TOL)) - goto exit; - if (media_count >= MAX_MEDIA) - goto exit; - if (tipc_media_find(m_ptr->name) || media_find_id(m_ptr->type_id)) - goto exit; - - media_list[media_count] = m_ptr; - media_count++; - res = 0; -exit: - write_unlock_bh(&tipc_net_lock); - if (res) - pr_warn("Media <%s> registration error\n", m_ptr->name); - return res; + return media_info_array[i]; } /** @@ -144,13 +116,11 @@ struct sk_buff *tipc_media_get_names(void) if (!buf) return NULL; - read_lock_bh(&tipc_net_lock); - for (i = 0; i < media_count; i++) { + for (i = 0; media_info_array[i] != NULL; i++) { tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, - media_list[i]->name, - strlen(media_list[i]->name) + 1); + media_info_array[i]->name, + strlen(media_info_array[i]->name) + 1); } - read_unlock_bh(&tipc_net_lock); return buf; } @@ -215,31 +185,12 @@ struct tipc_bearer *tipc_bearer_find(const char *name) } /** - * tipc_bearer_find_interface - locates bearer object with matching interface name - */ -struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) -{ - struct tipc_bearer *b_ptr; - char *b_if_name; - u32 i; - - for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { - if (!b_ptr->active) - continue; - b_if_name = strchr(b_ptr->name, ':') + 1; - if (!strcmp(b_if_name, if_name)) - return b_ptr; - } - return NULL; -} - -/** * tipc_bearer_get_names - record names of bearers in buffer */ struct sk_buff *tipc_bearer_get_names(void) { struct sk_buff *buf; - struct tipc_bearer *b_ptr; + struct tipc_bearer *b; int i, j; buf = tipc_cfg_reply_alloc(MAX_BEARERS * TLV_SPACE(TIPC_MAX_BEARER_NAME)); @@ -247,13 +198,13 @@ struct sk_buff *tipc_bearer_get_names(void) return NULL; read_lock_bh(&tipc_net_lock); - for (i = 0; i < media_count; i++) { + for (i = 0; media_info_array[i] != NULL; i++) { for (j = 0; j < MAX_BEARERS; j++) { - b_ptr = &tipc_bearers[j]; - if (b_ptr->active && (b_ptr->media == media_list[i])) { + b = &tipc_bearers[j]; + if (b->active && (b->media == media_info_array[i])) { tipc_cfg_append_tlv(buf, TIPC_TLV_BEARER_NAME, - b_ptr->name, - strlen(b_ptr->name) + 1); + b->name, + strlen(b->name) + 1); } } } @@ -275,31 +226,6 @@ void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) tipc_disc_remove_dest(b_ptr->link_req); } -/* - * Interrupt enabling new requests after bearer blocking: - * See bearer_send(). - */ -void tipc_continue(struct tipc_bearer *b) -{ - spin_lock_bh(&b->lock); - b->blocked = 0; - spin_unlock_bh(&b->lock); -} - -/* - * tipc_bearer_blocked - determines if bearer is currently blocked - */ -int tipc_bearer_blocked(struct tipc_bearer *b) -{ - int res; - - spin_lock_bh(&b->lock); - res = b->blocked; - spin_unlock_bh(&b->lock); - - return res; -} - /** * tipc_enable_bearer - enable bearer with the given name */ @@ -387,6 +313,7 @@ restart: b_ptr = &tipc_bearers[bearer_id]; strcpy(b_ptr->name, name); + b_ptr->media = m_ptr; res = m_ptr->enable_media(b_ptr); if (res) { pr_warn("Bearer <%s> rejected, enable failure (%d)\n", @@ -395,7 +322,6 @@ restart: } b_ptr->identity = bearer_id; - b_ptr->media = m_ptr; b_ptr->tolerance = m_ptr->tolerance; b_ptr->window = m_ptr->window; b_ptr->net_plane = bearer_id + 'A'; @@ -420,17 +346,16 @@ exit: } /** - * tipc_block_bearer - Block the bearer, and reset all its links + * tipc_reset_bearer - Reset all links established over this bearer */ -int tipc_block_bearer(struct tipc_bearer *b_ptr) +static int tipc_reset_bearer(struct tipc_bearer *b_ptr) { struct tipc_link *l_ptr; struct tipc_link *temp_l_ptr; read_lock_bh(&tipc_net_lock); - pr_info("Blocking bearer <%s>\n", b_ptr->name); + pr_info("Resetting bearer <%s>\n", b_ptr->name); spin_lock_bh(&b_ptr->lock); - b_ptr->blocked = 1; list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { struct tipc_node *n_ptr = l_ptr->owner; @@ -456,7 +381,6 @@ static void bearer_disable(struct tipc_bearer *b_ptr) pr_info("Disabling bearer <%s>\n", b_ptr->name); spin_lock_bh(&b_ptr->lock); - b_ptr->blocked = 1; b_ptr->media->disable_media(b_ptr); list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { tipc_link_delete(l_ptr); @@ -490,6 +414,211 @@ int tipc_disable_bearer(const char *name) } +/* tipc_l2_media_addr_set - initialize Ethernet media address structure + * + * Media-dependent "value" field stores MAC address in first 6 bytes + * and zeroes out the remaining bytes. + */ +void tipc_l2_media_addr_set(const struct tipc_bearer *b, + struct tipc_media_addr *a, char *mac) +{ + int len = b->media->hwaddr_len; + + if (unlikely(sizeof(a->value) < len)) { + WARN_ONCE(1, "Media length invalid\n"); + return; + } + + memcpy(a->value, mac, len); + memset(a->value + len, 0, sizeof(a->value) - len); + a->media_id = b->media->type_id; + a->broadcast = !memcmp(mac, b->bcast_addr.value, len); +} + +int tipc_enable_l2_media(struct tipc_bearer *b) +{ + struct net_device *dev; + char *driver_name = strchr((const char *)b->name, ':') + 1; + + /* Find device with specified name */ + dev = dev_get_by_name(&init_net, driver_name); + if (!dev) + return -ENODEV; + + /* Associate TIPC bearer with Ethernet bearer */ + b->media_ptr = dev; + memset(b->bcast_addr.value, 0, sizeof(b->bcast_addr.value)); + memcpy(b->bcast_addr.value, dev->broadcast, b->media->hwaddr_len); + b->bcast_addr.media_id = b->media->type_id; + b->bcast_addr.broadcast = 1; + b->mtu = dev->mtu; + tipc_l2_media_addr_set(b, &b->addr, (char *)dev->dev_addr); + rcu_assign_pointer(dev->tipc_ptr, b); + return 0; +} + +/* tipc_disable_l2_media - detach TIPC bearer from an Ethernet interface + * + * Mark Ethernet bearer as inactive so that incoming buffers are thrown away, + * then get worker thread to complete bearer cleanup. (Can't do cleanup + * here because cleanup code needs to sleep and caller holds spinlocks.) + */ +void tipc_disable_l2_media(struct tipc_bearer *b) +{ + struct net_device *dev = (struct net_device *)b->media_ptr; + RCU_INIT_POINTER(dev->tipc_ptr, NULL); + dev_put(dev); +} + +/** + * tipc_l2_send_msg - send a TIPC packet out over an Ethernet interface + * @buf: the packet to be sent + * @b_ptr: the bearer through which the packet is to be sent + * @dest: peer destination address + */ +int tipc_l2_send_msg(struct sk_buff *buf, struct tipc_bearer *b, + struct tipc_media_addr *dest) +{ + struct sk_buff *clone; + int delta; + struct net_device *dev = (struct net_device *)b->media_ptr; + + clone = skb_clone(buf, GFP_ATOMIC); + if (!clone) + return 0; + + delta = dev->hard_header_len - skb_headroom(buf); + if ((delta > 0) && + pskb_expand_head(clone, SKB_DATA_ALIGN(delta), 0, GFP_ATOMIC)) { + kfree_skb(clone); + return 0; + } + + skb_reset_network_header(clone); + clone->dev = dev; + clone->protocol = htons(ETH_P_TIPC); + dev_hard_header(clone, dev, ETH_P_TIPC, dest->value, + dev->dev_addr, clone->len); + dev_queue_xmit(clone); + return 0; +} + +/* tipc_bearer_send- sends buffer to destination over bearer + * + * IMPORTANT: + * The media send routine must not alter the buffer being passed in + * as it may be needed for later retransmission! + */ +void tipc_bearer_send(struct tipc_bearer *b, struct sk_buff *buf, + struct tipc_media_addr *dest) +{ + b->media->send_msg(buf, b, dest); +} + +/** + * tipc_l2_rcv_msg - handle incoming TIPC message from an interface + * @buf: the received packet + * @dev: the net device that the packet was received on + * @pt: the packet_type structure which was used to register this handler + * @orig_dev: the original receive net device in case the device is a bond + * + * Accept only packets explicitly sent to this node, or broadcast packets; + * ignores packets sent using interface multicast, and traffic sent to other + * nodes (which can happen if interface is running in promiscuous mode). + */ +static int tipc_l2_rcv_msg(struct sk_buff *buf, struct net_device *dev, + struct packet_type *pt, struct net_device *orig_dev) +{ + struct tipc_bearer *b_ptr; + + if (!net_eq(dev_net(dev), &init_net)) { + kfree_skb(buf); + return NET_RX_DROP; + } + + rcu_read_lock(); + b_ptr = rcu_dereference(dev->tipc_ptr); + if (likely(b_ptr)) { + if (likely(buf->pkt_type <= PACKET_BROADCAST)) { + buf->next = NULL; + tipc_rcv(buf, b_ptr); + rcu_read_unlock(); + return NET_RX_SUCCESS; + } + } + rcu_read_unlock(); + + kfree_skb(buf); + return NET_RX_DROP; +} + +/** + * tipc_l2_device_event - handle device events from network device + * @nb: the context of the notification + * @evt: the type of event + * @ptr: the net device that the event was on + * + * This function is called by the Ethernet driver in case of link + * change event. + */ +static int tipc_l2_device_event(struct notifier_block *nb, unsigned long evt, + void *ptr) +{ + struct tipc_bearer *b_ptr; + struct net_device *dev = netdev_notifier_info_to_dev(ptr); + + if (!net_eq(dev_net(dev), &init_net)) + return NOTIFY_DONE; + + rcu_read_lock(); + b_ptr = rcu_dereference(dev->tipc_ptr); + if (!b_ptr) { + rcu_read_unlock(); + return NOTIFY_DONE; + } + + b_ptr->mtu = dev->mtu; + + switch (evt) { + case NETDEV_CHANGE: + if (netif_carrier_ok(dev)) + break; + case NETDEV_DOWN: + case NETDEV_CHANGEMTU: + case NETDEV_CHANGEADDR: + tipc_reset_bearer(b_ptr); + break; + case NETDEV_UNREGISTER: + case NETDEV_CHANGENAME: + tipc_disable_bearer(b_ptr->name); + break; + } + rcu_read_unlock(); + + return NOTIFY_OK; +} + +static struct packet_type tipc_packet_type __read_mostly = { + .type = __constant_htons(ETH_P_TIPC), + .func = tipc_l2_rcv_msg, +}; + +static struct notifier_block notifier = { + .notifier_call = tipc_l2_device_event, + .priority = 0, +}; + +int tipc_bearer_setup(void) +{ + dev_add_pack(&tipc_packet_type); + return register_netdevice_notifier(¬ifier); +} + +void tipc_bearer_cleanup(void) +{ + unregister_netdevice_notifier(¬ifier); + dev_remove_pack(&tipc_packet_type); +} void tipc_bearer_stop(void) { @@ -499,5 +628,4 @@ void tipc_bearer_stop(void) if (tipc_bearers[i].active) bearer_disable(&tipc_bearers[i]); } - media_count = 0; } |