diff options
Diffstat (limited to 'net/tipc/bearer.c')
| -rw-r--r-- | net/tipc/bearer.c | 677 |
1 files changed, 338 insertions, 339 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c index 329fb659fae..264474394f9 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 @@ -39,124 +39,74 @@ #include "bearer.h" #include "discover.h" -#define MAX_ADDR_STR 32 +#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]; +struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1]; -static void bearer_disable(struct tipc_bearer *b_ptr); - -/** - * media_name_valid - validate media name - * - * Returns 1 if media name is valid, otherwise 0. - */ - -static int media_name_valid(const char *name) -{ - u32 len; - - len = strlen(name); - if ((len + 1) > TIPC_MAX_MEDIA_NAME) - return 0; - return strspn(name, tipc_alphabet) == len; -} +static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down); /** * tipc_media_find - locates specified media object by name */ - 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]; } /** * media_find_id - locates specified media object by type identifier */ - 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 (!media_name_valid(m_ptr->name)) - goto exit; - if ((m_ptr->bcast_addr.media_id != m_ptr->type_id) || - !m_ptr->bcast_addr.broadcast) - 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) - warn("Media <%s> registration error\n", m_ptr->name); - return res; + return media_info_array[i]; } /** * tipc_media_addr_printf - record media address in print buffer */ - -void tipc_media_addr_printf(struct print_buf *pb, struct tipc_media_addr *a) +void tipc_media_addr_printf(char *buf, int len, struct tipc_media_addr *a) { char addr_str[MAX_ADDR_STR]; struct tipc_media *m_ptr; + int ret; m_ptr = media_find_id(a->media_id); if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str))) - tipc_printf(pb, "%s(%s)", m_ptr->name, addr_str); + ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str); else { u32 i; - tipc_printf(pb, "UNKNOWN(%u)", a->media_id); + ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id); for (i = 0; i < sizeof(a->value); i++) - tipc_printf(pb, "-%02x", a->value[i]); + ret += tipc_snprintf(buf - ret, len + ret, + "-%02x", a->value[i]); } } /** * tipc_media_get_names - record names of registered media in buffer */ - struct sk_buff *tipc_media_get_names(void) { struct sk_buff *buf; @@ -166,24 +116,21 @@ 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; } /** * bearer_name_validate - validate & (optionally) deconstruct bearer name - * @name - ptr to bearer name string - * @name_parts - ptr to area for bearer name components (or NULL if not needed) + * @name: ptr to bearer name string + * @name_parts: ptr to area for bearer name components (or NULL if not needed) * * Returns 1 if bearer name is valid, otherwise 0. */ - static int bearer_name_validate(const char *name, struct tipc_bearer_names *name_parts) { @@ -194,7 +141,6 @@ static int bearer_name_validate(const char *name, u32 if_len; /* copy bearer name & ensure length is OK */ - name_copy[TIPC_MAX_BEARER_NAME - 1] = 0; /* need above in case non-Posix strncpy() doesn't pad with nulls */ strncpy(name_copy, name, TIPC_MAX_BEARER_NAME); @@ -202,7 +148,6 @@ static int bearer_name_validate(const char *name, return 0; /* ensure all component parts of bearer name are present */ - media_name = name_copy; if_name = strchr(media_name, ':'); if (if_name == NULL) @@ -212,15 +157,11 @@ static int bearer_name_validate(const char *name, if_len = strlen(if_name) + 1; /* validate component parts of bearer name */ - if ((media_len <= 1) || (media_len > TIPC_MAX_MEDIA_NAME) || - (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME) || - (strspn(media_name, tipc_alphabet) != (media_len - 1)) || - (strspn(if_name, tipc_alphabet) != (if_len - 1))) + (if_len <= 1) || (if_len > TIPC_MAX_IF_NAME)) return 0; /* return bearer name components, if necessary */ - if (name_parts) { strcpy(name_parts->media_name, media_name); strcpy(name_parts->if_name, if_name); @@ -231,34 +172,14 @@ static int bearer_name_validate(const char *name, /** * tipc_bearer_find - locates bearer object with matching bearer name */ - struct tipc_bearer *tipc_bearer_find(const char *name) { struct tipc_bearer *b_ptr; u32 i; - for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) { - if (b_ptr->active && (!strcmp(b_ptr->name, name))) - return b_ptr; - } - return NULL; -} - -/** - * 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)) + for (i = 0; i < MAX_BEARERS; i++) { + b_ptr = rtnl_dereference(bearer_list[i]); + if (b_ptr && (!strcmp(b_ptr->name, name))) return b_ptr; } return NULL; @@ -267,163 +188,60 @@ struct tipc_bearer *tipc_bearer_find_interface(const char *if_name) /** * 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)); 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++) { for (j = 0; j < MAX_BEARERS; j++) { - b_ptr = &tipc_bearers[j]; - if (b_ptr->active && (b_ptr->media == media_list[i])) { + b = rtnl_dereference(bearer_list[j]); + if (!b) + continue; + if (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); } } } - read_unlock_bh(&tipc_net_lock); return buf; } -void tipc_bearer_add_dest(struct tipc_bearer *b_ptr, u32 dest) -{ - tipc_nmap_add(&b_ptr->nodes, dest); - tipc_bcbearer_sort(); - tipc_disc_add_dest(b_ptr->link_req); -} - -void tipc_bearer_remove_dest(struct tipc_bearer *b_ptr, u32 dest) -{ - tipc_nmap_remove(&b_ptr->nodes, dest); - tipc_bcbearer_sort(); - tipc_disc_remove_dest(b_ptr->link_req); -} - -/* - * bearer_push(): Resolve bearer congestion. Force the waiting - * links to push out their unsent packets, one packet per link - * per iteration, until all packets are gone or congestion reoccurs. - * 'tipc_net_lock' is read_locked when this function is called - * bearer.lock must be taken before calling - * Returns binary true(1) ore false(0) - */ -static int bearer_push(struct tipc_bearer *b_ptr) +void tipc_bearer_add_dest(u32 bearer_id, u32 dest) { - u32 res = 0; - struct tipc_link *ln, *tln; - - if (b_ptr->blocked) - return 0; + struct tipc_bearer *b_ptr; - while (!list_empty(&b_ptr->cong_links) && (res != PUSH_FAILED)) { - list_for_each_entry_safe(ln, tln, &b_ptr->cong_links, link_list) { - res = tipc_link_push_packet(ln); - if (res == PUSH_FAILED) - break; - if (res == PUSH_FINISHED) - list_move_tail(&ln->link_list, &b_ptr->links); - } + rcu_read_lock(); + b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); + if (b_ptr) { + tipc_bcbearer_sort(&b_ptr->nodes, dest, true); + tipc_disc_add_dest(b_ptr->link_req); } - return list_empty(&b_ptr->cong_links); -} - -void tipc_bearer_lock_push(struct tipc_bearer *b_ptr) -{ - spin_lock_bh(&b_ptr->lock); - bearer_push(b_ptr); - spin_unlock_bh(&b_ptr->lock); -} - - -/* - * Interrupt enabling new requests after bearer congestion or blocking: - * See bearer_send(). - */ -void tipc_continue(struct tipc_bearer *b_ptr) -{ - spin_lock_bh(&b_ptr->lock); - if (!list_empty(&b_ptr->cong_links)) - tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr); - b_ptr->blocked = 0; - spin_unlock_bh(&b_ptr->lock); -} - -/* - * Schedule link for sending of messages after the bearer - * has been deblocked by 'continue()'. This method is called - * when somebody tries to send a message via this link while - * the bearer is congested. 'tipc_net_lock' is in read_lock here - * bearer.lock is busy - */ - -static void tipc_bearer_schedule_unlocked(struct tipc_bearer *b_ptr, - struct tipc_link *l_ptr) -{ - list_move_tail(&l_ptr->link_list, &b_ptr->cong_links); + rcu_read_unlock(); } -/* - * Schedule link for sending of messages after the bearer - * has been deblocked by 'continue()'. This method is called - * when somebody tries to send a message via this link while - * the bearer is congested. 'tipc_net_lock' is in read_lock here, - * bearer.lock is free - */ - -void tipc_bearer_schedule(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr) +void tipc_bearer_remove_dest(u32 bearer_id, u32 dest) { - spin_lock_bh(&b_ptr->lock); - tipc_bearer_schedule_unlocked(b_ptr, l_ptr); - spin_unlock_bh(&b_ptr->lock); -} - - -/* - * tipc_bearer_resolve_congestion(): Check if there is bearer congestion, - * and if there is, try to resolve it before returning. - * 'tipc_net_lock' is read_locked when this function is called - */ -int tipc_bearer_resolve_congestion(struct tipc_bearer *b_ptr, - struct tipc_link *l_ptr) -{ - int res = 1; + struct tipc_bearer *b_ptr; - if (list_empty(&b_ptr->cong_links)) - return 1; - spin_lock_bh(&b_ptr->lock); - if (!bearer_push(b_ptr)) { - tipc_bearer_schedule_unlocked(b_ptr, l_ptr); - res = 0; + rcu_read_lock(); + b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); + if (b_ptr) { + tipc_bcbearer_sort(&b_ptr->nodes, dest, false); + tipc_disc_remove_dest(b_ptr->link_req); } - spin_unlock_bh(&b_ptr->lock); - return res; -} - -/** - * tipc_bearer_congested - determines if bearer is currently congested - */ - -int tipc_bearer_congested(struct tipc_bearer *b_ptr, struct tipc_link *l_ptr) -{ - if (unlikely(b_ptr->blocked)) - return 1; - if (likely(list_empty(&b_ptr->cong_links))) - return 0; - return !tipc_bearer_resolve_congestion(b_ptr, l_ptr); + rcu_read_unlock(); } /** * tipc_enable_bearer - enable bearer with the given name */ - int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) { struct tipc_bearer *b_ptr; @@ -435,13 +253,13 @@ int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) u32 i; int res = -EINVAL; - if (tipc_mode != TIPC_NET_MODE) { - warn("Bearer <%s> rejected, not supported in standalone mode\n", - name); + if (!tipc_own_addr) { + pr_warn("Bearer <%s> rejected, not supported in standalone mode\n", + name); return -ENOPROTOOPT; } if (!bearer_name_validate(name, &b_names)) { - warn("Bearer <%s> rejected, illegal name\n", name); + pr_warn("Bearer <%s> rejected, illegal name\n", name); return -EINVAL; } if (tipc_addr_domain_valid(disc_domain) && @@ -449,27 +267,25 @@ int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority) if (tipc_in_scope(disc_domain, tipc_own_addr)) { disc_domain = tipc_own_addr & TIPC_CLUSTER_MASK; res = 0; /* accept any node in own cluster */ - } else if (in_own_cluster(disc_domain)) + } else if (in_own_cluster_exact(disc_domain)) res = 0; /* accept specified node in own cluster */ } if (res) { - warn("Bearer <%s> rejected, illegal discovery domain\n", name); + pr_warn("Bearer <%s> rejected, illegal discovery domain\n", + name); return -EINVAL; } - if ((priority < TIPC_MIN_LINK_PRI || - priority > TIPC_MAX_LINK_PRI) && + if ((priority > TIPC_MAX_LINK_PRI) && (priority != TIPC_MEDIA_LINK_PRI)) { - warn("Bearer <%s> rejected, illegal priority\n", name); + pr_warn("Bearer <%s> rejected, illegal priority\n", name); return -EINVAL; } - write_lock_bh(&tipc_net_lock); - m_ptr = tipc_media_find(b_names.media_name); if (!m_ptr) { - warn("Bearer <%s> rejected, media <%s> not registered\n", name, - b_names.media_name); - goto exit; + pr_warn("Bearer <%s> rejected, media <%s> not registered\n", + name, b_names.media_name); + return -EINVAL; } if (priority == TIPC_MEDIA_LINK_PRI) @@ -479,123 +295,104 @@ restart: bearer_id = MAX_BEARERS; with_this_prio = 1; for (i = MAX_BEARERS; i-- != 0; ) { - if (!tipc_bearers[i].active) { + b_ptr = rtnl_dereference(bearer_list[i]); + if (!b_ptr) { bearer_id = i; continue; } - if (!strcmp(name, tipc_bearers[i].name)) { - warn("Bearer <%s> rejected, already enabled\n", name); - goto exit; + if (!strcmp(name, b_ptr->name)) { + pr_warn("Bearer <%s> rejected, already enabled\n", + name); + return -EINVAL; } - if ((tipc_bearers[i].priority == priority) && + if ((b_ptr->priority == priority) && (++with_this_prio > 2)) { if (priority-- == 0) { - warn("Bearer <%s> rejected, duplicate priority\n", - name); - goto exit; + pr_warn("Bearer <%s> rejected, duplicate priority\n", + name); + return -EINVAL; } - warn("Bearer <%s> priority adjustment required %u->%u\n", - name, priority + 1, priority); + pr_warn("Bearer <%s> priority adjustment required %u->%u\n", + name, priority + 1, priority); goto restart; } } if (bearer_id >= MAX_BEARERS) { - warn("Bearer <%s> rejected, bearer limit reached (%u)\n", - name, MAX_BEARERS); - goto exit; + pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n", + name, MAX_BEARERS); + return -EINVAL; } - b_ptr = &tipc_bearers[bearer_id]; + b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC); + if (!b_ptr) + return -ENOMEM; + strcpy(b_ptr->name, name); - res = m_ptr->enable_bearer(b_ptr); + b_ptr->media = m_ptr; + res = m_ptr->enable_media(b_ptr); if (res) { - warn("Bearer <%s> rejected, enable failure (%d)\n", name, -res); - goto exit; + pr_warn("Bearer <%s> rejected, enable failure (%d)\n", + name, -res); + return -EINVAL; } b_ptr->identity = bearer_id; - b_ptr->media = m_ptr; b_ptr->tolerance = m_ptr->tolerance; b_ptr->window = m_ptr->window; + b_ptr->domain = disc_domain; b_ptr->net_plane = bearer_id + 'A'; - b_ptr->active = 1; b_ptr->priority = priority; - INIT_LIST_HEAD(&b_ptr->cong_links); - INIT_LIST_HEAD(&b_ptr->links); - spin_lock_init(&b_ptr->lock); - res = tipc_disc_create(b_ptr, &m_ptr->bcast_addr, disc_domain); + res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr); if (res) { - bearer_disable(b_ptr); - warn("Bearer <%s> rejected, discovery object creation failed\n", - name); - goto exit; + bearer_disable(b_ptr, false); + pr_warn("Bearer <%s> rejected, discovery object creation failed\n", + name); + return -EINVAL; } - info("Enabled bearer <%s>, discovery domain %s, priority %u\n", - name, tipc_addr_string_fill(addr_string, disc_domain), priority); -exit: - write_unlock_bh(&tipc_net_lock); + + rcu_assign_pointer(bearer_list[bearer_id], b_ptr); + + pr_info("Enabled bearer <%s>, discovery domain %s, priority %u\n", + name, + tipc_addr_string_fill(addr_string, disc_domain), priority); return res; } /** - * tipc_block_bearer(): Block the bearer with the given name, - * and reset all its links + * tipc_reset_bearer - Reset all links established over this bearer */ - -int tipc_block_bearer(const char *name) +static int tipc_reset_bearer(struct tipc_bearer *b_ptr) { - struct tipc_bearer *b_ptr = NULL; - struct tipc_link *l_ptr; - struct tipc_link *temp_l_ptr; - - read_lock_bh(&tipc_net_lock); - b_ptr = tipc_bearer_find(name); - if (!b_ptr) { - warn("Attempt to block unknown bearer <%s>\n", name); - read_unlock_bh(&tipc_net_lock); - return -EINVAL; - } - - info("Blocking bearer <%s>\n", name); - spin_lock_bh(&b_ptr->lock); - b_ptr->blocked = 1; - list_splice_init(&b_ptr->cong_links, &b_ptr->links); - list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { - struct tipc_node *n_ptr = l_ptr->owner; - - spin_lock_bh(&n_ptr->lock); - tipc_link_reset(l_ptr); - spin_unlock_bh(&n_ptr->lock); - } - spin_unlock_bh(&b_ptr->lock); - read_unlock_bh(&tipc_net_lock); + pr_info("Resetting bearer <%s>\n", b_ptr->name); + tipc_link_reset_list(b_ptr->identity); + tipc_disc_reset(b_ptr); return 0; } /** - * bearer_disable - + * bearer_disable * - * Note: This routine assumes caller holds tipc_net_lock. + * Note: This routine assumes caller holds RTNL lock. */ - -static void bearer_disable(struct tipc_bearer *b_ptr) +static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down) { - struct tipc_link *l_ptr; - struct tipc_link *temp_l_ptr; - - info("Disabling bearer <%s>\n", b_ptr->name); - spin_lock_bh(&b_ptr->lock); - b_ptr->blocked = 1; - b_ptr->media->disable_bearer(b_ptr); - list_splice_init(&b_ptr->cong_links, &b_ptr->links); - list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) { - tipc_link_delete(l_ptr); - } + u32 i; + + pr_info("Disabling bearer <%s>\n", b_ptr->name); + b_ptr->media->disable_media(b_ptr); + + tipc_link_delete_list(b_ptr->identity, shutting_down); if (b_ptr->link_req) tipc_disc_delete(b_ptr->link_req); - spin_unlock_bh(&b_ptr->lock); - memset(b_ptr, 0, sizeof(struct tipc_bearer)); + + for (i = 0; i < MAX_BEARERS; i++) { + if (b_ptr == rtnl_dereference(bearer_list[i])) { + RCU_INIT_POINTER(bearer_list[i], NULL); + break; + } + } + kfree_rcu(b_ptr, rcu); } int tipc_disable_bearer(const char *name) @@ -603,28 +400,230 @@ int tipc_disable_bearer(const char *name) struct tipc_bearer *b_ptr; int res; - write_lock_bh(&tipc_net_lock); b_ptr = tipc_bearer_find(name); if (b_ptr == NULL) { - warn("Attempt to disable unknown bearer <%s>\n", name); + pr_warn("Attempt to disable unknown bearer <%s>\n", name); res = -EINVAL; } else { - bearer_disable(b_ptr); + bearer_disable(b_ptr, false); res = 0; } - write_unlock_bh(&tipc_net_lock); return res; } +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 L2 bearer */ + rcu_assign_pointer(b->media_ptr, dev); + memset(&b->bcast_addr, 0, sizeof(b->bcast_addr)); + 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; + b->media->raw2addr(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 L2 interface + * + * Mark L2 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; + + dev = (struct net_device *)rtnl_dereference(b->media_ptr); + RCU_INIT_POINTER(b->media_ptr, NULL); + RCU_INIT_POINTER(dev->tipc_ptr, NULL); + synchronize_net(); + dev_put(dev); +} + +/** + * tipc_l2_send_msg - send a TIPC packet out over an L2 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; + struct net_device *dev; + int delta; + + dev = (struct net_device *)rcu_dereference_rtnl(b->media_ptr); + if (!dev) + return 0; + + 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(u32 bearer_id, struct sk_buff *buf, + struct tipc_media_addr *dest) +{ + struct tipc_bearer *b_ptr; + + rcu_read_lock(); + b_ptr = rcu_dereference_rtnl(bearer_list[bearer_id]); + if (likely(b_ptr)) + b_ptr->media->send_msg(buf, b_ptr, dest); + rcu_read_unlock(); +} + +/** + * 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_rtnl(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; + + b_ptr = rtnl_dereference(dev->tipc_ptr); + if (!b_ptr) + 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: + tipc_reset_bearer(b_ptr); + break; + case NETDEV_CHANGEADDR: + b_ptr->media->raw2addr(b_ptr, &b_ptr->addr, + (char *)dev->dev_addr); + tipc_reset_bearer(b_ptr); + break; + case NETDEV_UNREGISTER: + case NETDEV_CHANGENAME: + bearer_disable(b_ptr, false); + break; + } + return NOTIFY_OK; +} + +static struct packet_type tipc_packet_type __read_mostly = { + .type = 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) +{ + int err; + + err = register_netdevice_notifier(¬ifier); + if (err) + return err; + dev_add_pack(&tipc_packet_type); + return 0; +} + +void tipc_bearer_cleanup(void) +{ + unregister_netdevice_notifier(¬ifier); + dev_remove_pack(&tipc_packet_type); +} void tipc_bearer_stop(void) { + struct tipc_bearer *b_ptr; u32 i; for (i = 0; i < MAX_BEARERS; i++) { - if (tipc_bearers[i].active) - bearer_disable(&tipc_bearers[i]); + b_ptr = rtnl_dereference(bearer_list[i]); + if (b_ptr) { + bearer_disable(b_ptr, true); + bearer_list[i] = NULL; + } } - media_count = 0; } |