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-rw-r--r--net/tipc/bearer.c820
1 files changed, 372 insertions, 448 deletions
diff --git a/net/tipc/bearer.c b/net/tipc/bearer.c
index 327011fcc40..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, 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
@@ -36,206 +36,103 @@
#include "core.h"
#include "config.h"
-#include "dbg.h"
#include "bearer.h"
-#include "link.h"
-#include "port.h"
#include "discover.h"
-#include "bcast.h"
-#define MAX_ADDR_STR 32
+#define MAX_ADDR_STR 60
-static struct media *media_list = NULL;
-static u32 media_count = 0;
+static struct tipc_media * const media_info_array[] = {
+ &eth_media_info,
+#ifdef CONFIG_TIPC_MEDIA_IB
+ &ib_media_info,
+#endif
+ NULL
+};
-struct bearer *tipc_bearers = NULL;
+struct tipc_bearer __rcu *bearer_list[MAX_BEARERS + 1];
-/**
- * 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);
/**
- * media_find - locates specified media object by name
+ * tipc_media_find - locates specified media object by name
*/
-
-static struct media *media_find(const char *name)
+struct tipc_media *tipc_media_find(const char *name)
{
- struct media *m_ptr;
u32 i;
- for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
- if (!strcmp(m_ptr->name, name))
- return m_ptr;
+ 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];
}
/**
- * tipc_register_media - register a media type
- *
- * Bearers for this media type must be activated separately at a later stage.
+ * media_find_id - locates specified media object by type identifier
*/
-
-int tipc_register_media(u32 media_type,
- char *name,
- int (*enable)(struct tipc_bearer *),
- void (*disable)(struct tipc_bearer *),
- int (*send_msg)(struct sk_buff *,
- struct tipc_bearer *,
- struct tipc_media_addr *),
- char *(*addr2str)(struct tipc_media_addr *a,
- char *str_buf, int str_size),
- struct tipc_media_addr *bcast_addr,
- const u32 bearer_priority,
- const u32 link_tolerance, /* [ms] */
- const u32 send_window_limit)
+static struct tipc_media *media_find_id(u8 type)
{
- struct media *m_ptr;
- u32 media_id;
u32 i;
- int res = -EINVAL;
-
- write_lock_bh(&tipc_net_lock);
- if (!media_list)
- goto exit;
-
- if (!media_name_valid(name)) {
- warn("Media <%s> rejected, illegal name\n", name);
- goto exit;
- }
- if (!bcast_addr) {
- warn("Media <%s> rejected, no broadcast address\n", name);
- goto exit;
- }
- if ((bearer_priority < TIPC_MIN_LINK_PRI) ||
- (bearer_priority > TIPC_MAX_LINK_PRI)) {
- warn("Media <%s> rejected, illegal priority (%u)\n", name,
- bearer_priority);
- goto exit;
- }
- if ((link_tolerance < TIPC_MIN_LINK_TOL) ||
- (link_tolerance > TIPC_MAX_LINK_TOL)) {
- warn("Media <%s> rejected, illegal tolerance (%u)\n", name,
- link_tolerance);
- goto exit;
- }
- media_id = media_count++;
- if (media_id >= MAX_MEDIA) {
- warn("Media <%s> rejected, media limit reached (%u)\n", name,
- MAX_MEDIA);
- media_count--;
- goto exit;
- }
- for (i = 0; i < media_id; i++) {
- if (media_list[i].type_id == media_type) {
- warn("Media <%s> rejected, duplicate type (%u)\n", name,
- media_type);
- media_count--;
- goto exit;
- }
- if (!strcmp(name, media_list[i].name)) {
- warn("Media <%s> rejected, duplicate name\n", name);
- media_count--;
- goto exit;
- }
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ if (media_info_array[i]->type_id == type)
+ break;
}
-
- m_ptr = &media_list[media_id];
- m_ptr->type_id = media_type;
- m_ptr->send_msg = send_msg;
- m_ptr->enable_bearer = enable;
- m_ptr->disable_bearer = disable;
- m_ptr->addr2str = addr2str;
- memcpy(&m_ptr->bcast_addr, bcast_addr, sizeof(*bcast_addr));
- m_ptr->bcast = 1;
- strcpy(m_ptr->name, name);
- m_ptr->priority = bearer_priority;
- m_ptr->tolerance = link_tolerance;
- m_ptr->window = send_window_limit;
- dbg("Media <%s> registered\n", name);
- res = 0;
-exit:
- write_unlock_bh(&tipc_net_lock);
- 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)
{
- struct media *m_ptr;
- u32 media_type;
- u32 i;
-
- media_type = ntohl(a->type);
- for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
- if (m_ptr->type_id == media_type)
- break;
- }
+ char addr_str[MAX_ADDR_STR];
+ struct tipc_media *m_ptr;
+ int ret;
- if ((i < media_count) && (m_ptr->addr2str != NULL)) {
- char addr_str[MAX_ADDR_STR];
+ m_ptr = media_find_id(a->media_id);
- tipc_printf(pb, "%s(%s)", m_ptr->name,
- m_ptr->addr2str(a, addr_str, sizeof(addr_str)));
- } else {
- unchar *addr = (unchar *)&a->dev_addr;
+ if (m_ptr && !m_ptr->addr2str(a, addr_str, sizeof(addr_str)))
+ ret = tipc_snprintf(buf, len, "%s(%s)", m_ptr->name, addr_str);
+ else {
+ u32 i;
- tipc_printf(pb, "UNKNOWN(%u)", media_type);
- for (i = 0; i < (sizeof(*a) - sizeof(a->type)); i++) {
- tipc_printf(pb, "-%02x", addr[i]);
- }
+ ret = tipc_snprintf(buf, len, "UNKNOWN(%u)", a->media_id);
+ for (i = 0; i < sizeof(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;
- struct media *m_ptr;
int i;
buf = tipc_cfg_reply_alloc(MAX_MEDIA * TLV_SPACE(TIPC_MAX_MEDIA_NAME));
if (!buf)
return NULL;
- read_lock_bh(&tipc_net_lock);
- for (i = 0, m_ptr = media_list; i < media_count; i++, m_ptr++) {
- tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME, m_ptr->name,
- strlen(m_ptr->name) + 1);
+ for (i = 0; media_info_array[i] != NULL; i++) {
+ tipc_cfg_append_tlv(buf, TIPC_TLV_MEDIA_NAME,
+ 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 bearer_name *name_parts)
+ struct tipc_bearer_names *name_parts)
{
char name_copy[TIPC_MAX_BEARER_NAME];
char *media_name;
@@ -244,7 +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);
@@ -252,24 +148,20 @@ static int bearer_name_validate(const char *name,
return 0;
/* ensure all component parts of bearer name are present */
-
media_name = name_copy;
- if ((if_name = strchr(media_name, ':')) == NULL)
+ if_name = strchr(media_name, ':');
+ if (if_name == NULL)
return 0;
*(if_name++) = 0;
media_len = if_name - media_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);
@@ -278,39 +170,16 @@ static int bearer_name_validate(const char *name,
}
/**
- * bearer_find - locates bearer object with matching bearer name
+ * tipc_bearer_find - locates bearer object with matching bearer name
*/
-
-static struct bearer *bearer_find(const char *name)
+struct tipc_bearer *tipc_bearer_find(const char *name)
{
- struct bearer *b_ptr;
+ struct tipc_bearer *b_ptr;
u32 i;
- if (tipc_mode != TIPC_NET_MODE)
- return NULL;
-
- for (i = 0, b_ptr = tipc_bearers; i < MAX_BEARERS; i++, b_ptr++) {
- if (b_ptr->active && (!strcmp(b_ptr->publ.name, name)))
- return b_ptr;
- }
- return NULL;
-}
-
-/**
- * tipc_bearer_find_interface - locates bearer object with matching interface name
- */
-
-struct bearer *tipc_bearer_find_interface(const char *if_name)
-{
- struct 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->publ.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;
@@ -319,196 +188,104 @@ struct 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 media *m_ptr;
- struct 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, m_ptr = media_list; i < media_count; i++, m_ptr++) {
+ 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 == m_ptr)) {
+ 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->publ.name,
- strlen(b_ptr->publ.name) + 1);
+ b->name,
+ strlen(b->name) + 1);
}
}
}
- read_unlock_bh(&tipc_net_lock);
return buf;
}
-void tipc_bearer_add_dest(struct bearer *b_ptr, u32 dest)
-{
- tipc_nmap_add(&b_ptr->nodes, dest);
- tipc_disc_update_link_req(b_ptr->link_req);
- tipc_bcbearer_sort();
-}
-
-void tipc_bearer_remove_dest(struct bearer *b_ptr, u32 dest)
-{
- tipc_nmap_remove(&b_ptr->nodes, dest);
- tipc_disc_update_link_req(b_ptr->link_req);
- tipc_bcbearer_sort();
-}
-
-/*
- * 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 bearer *b_ptr)
+void tipc_bearer_add_dest(u32 bearer_id, u32 dest)
{
- u32 res = 0;
- struct link *ln, *tln;
-
- if (b_ptr->publ.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);
+ rcu_read_unlock();
}
-void tipc_bearer_lock_push(struct bearer *b_ptr)
+void tipc_bearer_remove_dest(u32 bearer_id, u32 dest)
{
- int res;
-
- spin_lock_bh(&b_ptr->publ.lock);
- res = bearer_push(b_ptr);
- spin_unlock_bh(&b_ptr->publ.lock);
- if (res)
- tipc_bcbearer_push();
-}
-
+ struct tipc_bearer *b_ptr;
-/*
- * Interrupt enabling new requests after bearer congestion or blocking:
- * See bearer_send().
- */
-void tipc_continue(struct tipc_bearer *tb_ptr)
-{
- struct bearer *b_ptr = (struct bearer *)tb_ptr;
-
- spin_lock_bh(&b_ptr->publ.lock);
- b_ptr->continue_count++;
- if (!list_empty(&b_ptr->cong_links))
- tipc_k_signal((Handler)tipc_bearer_lock_push, (unsigned long)b_ptr);
- b_ptr->publ.blocked = 0;
- spin_unlock_bh(&b_ptr->publ.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 bearer *b_ptr, struct link *l_ptr)
-{
- list_move_tail(&l_ptr->link_list, &b_ptr->cong_links);
-}
-
-/*
- * 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 bearer *b_ptr, struct link *l_ptr)
-{
- spin_lock_bh(&b_ptr->publ.lock);
- tipc_bearer_schedule_unlocked(b_ptr, l_ptr);
- spin_unlock_bh(&b_ptr->publ.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 bearer *b_ptr, struct link *l_ptr)
-{
- int res = 1;
-
- if (list_empty(&b_ptr->cong_links))
- return 1;
- spin_lock_bh(&b_ptr->publ.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->publ.lock);
- return res;
+ rcu_read_unlock();
}
-
/**
* tipc_enable_bearer - enable bearer with the given name
*/
-
-int tipc_enable_bearer(const char *name, u32 bcast_scope, u32 priority)
+int tipc_enable_bearer(const char *name, u32 disc_domain, u32 priority)
{
- struct bearer *b_ptr;
- struct media *m_ptr;
- struct bearer_name b_name;
+ struct tipc_bearer *b_ptr;
+ struct tipc_media *m_ptr;
+ struct tipc_bearer_names b_names;
char addr_string[16];
u32 bearer_id;
u32 with_this_prio;
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_name)) {
- warn("Bearer <%s> rejected, illegal name\n", name);
+ if (!bearer_name_validate(name, &b_names)) {
+ pr_warn("Bearer <%s> rejected, illegal name\n", name);
return -EINVAL;
}
- if (!tipc_addr_domain_valid(bcast_scope) ||
- !in_scope(bcast_scope, tipc_own_addr)) {
- warn("Bearer <%s> rejected, illegal broadcast scope\n", name);
+ if (tipc_addr_domain_valid(disc_domain) &&
+ (disc_domain != tipc_own_addr)) {
+ 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_exact(disc_domain))
+ res = 0; /* accept specified node in own cluster */
+ }
+ if (res) {
+ 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 = media_find(b_name.media_name);
+ m_ptr = tipc_media_find(b_names.media_name);
if (!m_ptr) {
- warn("Bearer <%s> rejected, media <%s> not registered\n", name,
- b_name.media_name);
- goto failed;
+ pr_warn("Bearer <%s> rejected, media <%s> not registered\n",
+ name, b_names.media_name);
+ return -EINVAL;
}
if (priority == TIPC_MEDIA_LINK_PRI)
@@ -518,188 +295,335 @@ 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].publ.name)) {
- warn("Bearer <%s> rejected, already enabled\n", name);
- goto failed;
+ 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 failed;
+ 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 failed;
+ pr_warn("Bearer <%s> rejected, bearer limit reached (%u)\n",
+ name, MAX_BEARERS);
+ return -EINVAL;
}
- b_ptr = &tipc_bearers[bearer_id];
- memset(b_ptr, 0, sizeof(struct bearer));
+ b_ptr = kzalloc(sizeof(*b_ptr), GFP_ATOMIC);
+ if (!b_ptr)
+ return -ENOMEM;
- strcpy(b_ptr->publ.name, name);
- res = m_ptr->enable_bearer(&b_ptr->publ);
+ strcpy(b_ptr->name, name);
+ 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 failed;
+ 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->detect_scope = bcast_scope;
b_ptr->priority = priority;
- INIT_LIST_HEAD(&b_ptr->cong_links);
- INIT_LIST_HEAD(&b_ptr->links);
- if (m_ptr->bcast) {
- b_ptr->link_req = tipc_disc_init_link_req(b_ptr, &m_ptr->bcast_addr,
- bcast_scope, 2);
+
+ res = tipc_disc_create(b_ptr, &b_ptr->bcast_addr);
+ if (res) {
+ bearer_disable(b_ptr, false);
+ pr_warn("Bearer <%s> rejected, discovery object creation failed\n",
+ name);
+ return -EINVAL;
}
- spin_lock_init(&b_ptr->publ.lock);
- write_unlock_bh(&tipc_net_lock);
- info("Enabled bearer <%s>, discovery domain %s, priority %u\n",
- name, addr_string_fill(addr_string, bcast_scope), priority);
- return 0;
-failed:
- 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
*/
+static int tipc_reset_bearer(struct tipc_bearer *b_ptr)
+{
+ pr_info("Resetting bearer <%s>\n", b_ptr->name);
+ tipc_link_reset_list(b_ptr->identity);
+ tipc_disc_reset(b_ptr);
+ return 0;
+}
-int tipc_block_bearer(const char *name)
+/**
+ * bearer_disable
+ *
+ * Note: This routine assumes caller holds RTNL lock.
+ */
+static void bearer_disable(struct tipc_bearer *b_ptr, bool shutting_down)
{
- struct bearer *b_ptr = NULL;
- struct link *l_ptr;
- struct link *temp_l_ptr;
-
- read_lock_bh(&tipc_net_lock);
- b_ptr = bearer_find(name);
- if (!b_ptr) {
- warn("Attempt to block unknown bearer <%s>\n", name);
- read_unlock_bh(&tipc_net_lock);
- return -EINVAL;
+ 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);
+
+ 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);
+}
- info("Blocking bearer <%s>\n", name);
- spin_lock_bh(&b_ptr->publ.lock);
- b_ptr->publ.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;
+int tipc_disable_bearer(const char *name)
+{
+ struct tipc_bearer *b_ptr;
+ int res;
- spin_lock_bh(&n_ptr->lock);
- tipc_link_reset(l_ptr);
- spin_unlock_bh(&n_ptr->lock);
+ b_ptr = tipc_bearer_find(name);
+ if (b_ptr == NULL) {
+ pr_warn("Attempt to disable unknown bearer <%s>\n", name);
+ res = -EINVAL;
+ } else {
+ bearer_disable(b_ptr, false);
+ res = 0;
}
- spin_unlock_bh(&b_ptr->publ.lock);
- read_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;
}
-/**
- * bearer_disable -
+/* tipc_disable_l2_media - detach TIPC bearer from an L2 interface
*
- * Note: This routine assumes caller holds tipc_net_lock.
+ * 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;
-static int bearer_disable(const char *name)
+ 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 bearer *b_ptr;
- struct link *l_ptr;
- struct link *temp_l_ptr;
+ struct sk_buff *clone;
+ struct net_device *dev;
+ int delta;
- b_ptr = bearer_find(name);
- if (!b_ptr) {
- warn("Attempt to disable unknown bearer <%s>\n", name);
- return -EINVAL;
+ 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;
}
- info("Disabling bearer <%s>\n", name);
- tipc_disc_stop_link_req(b_ptr->link_req);
- spin_lock_bh(&b_ptr->publ.lock);
- b_ptr->link_req = NULL;
- b_ptr->publ.blocked = 1;
- if (b_ptr->media->disable_bearer) {
- spin_unlock_bh(&b_ptr->publ.lock);
- write_unlock_bh(&tipc_net_lock);
- b_ptr->media->disable_bearer(&b_ptr->publ);
- write_lock_bh(&tipc_net_lock);
- spin_lock_bh(&b_ptr->publ.lock);
+ 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;
}
- list_for_each_entry_safe(l_ptr, temp_l_ptr, &b_ptr->links, link_list) {
- tipc_link_delete(l_ptr);
+
+ 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;
+ }
}
- spin_unlock_bh(&b_ptr->publ.lock);
- memset(b_ptr, 0, sizeof(struct bearer));
- return 0;
+ rcu_read_unlock();
+
+ kfree_skb(buf);
+ return NET_RX_DROP;
}
-int tipc_disable_bearer(const char *name)
+/**
+ * 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)
{
- int res;
+ struct tipc_bearer *b_ptr;
+ struct net_device *dev = netdev_notifier_info_to_dev(ptr);
- write_lock_bh(&tipc_net_lock);
- res = bearer_disable(name);
- write_unlock_bh(&tipc_net_lock);
- return res;
+ 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_init(void)
+int tipc_bearer_setup(void)
{
- int res;
+ int err;
- write_lock_bh(&tipc_net_lock);
- tipc_bearers = kcalloc(MAX_BEARERS, sizeof(struct bearer), GFP_ATOMIC);
- media_list = kcalloc(MAX_MEDIA, sizeof(struct media), GFP_ATOMIC);
- if (tipc_bearers && media_list) {
- res = 0;
- } else {
- kfree(tipc_bearers);
- kfree(media_list);
- tipc_bearers = NULL;
- media_list = NULL;
- res = -ENOMEM;
- }
- write_unlock_bh(&tipc_net_lock);
- return res;
+ err = register_netdevice_notifier(&notifier);
+ if (err)
+ return err;
+ dev_add_pack(&tipc_packet_type);
+ return 0;
+}
+
+void tipc_bearer_cleanup(void)
+{
+ unregister_netdevice_notifier(&notifier);
+ dev_remove_pack(&tipc_packet_type);
}
void tipc_bearer_stop(void)
{
+ struct tipc_bearer *b_ptr;
u32 i;
- if (!tipc_bearers)
- return;
-
for (i = 0; i < MAX_BEARERS; i++) {
- if (tipc_bearers[i].active)
- tipc_bearers[i].publ.blocked = 1;
- }
- for (i = 0; i < MAX_BEARERS; i++) {
- if (tipc_bearers[i].active)
- bearer_disable(tipc_bearers[i].publ.name);
+ b_ptr = rtnl_dereference(bearer_list[i]);
+ if (b_ptr) {
+ bearer_disable(b_ptr, true);
+ bearer_list[i] = NULL;
+ }
}
- kfree(tipc_bearers);
- kfree(media_list);
- tipc_bearers = NULL;
- media_list = NULL;
- media_count = 0;
}
-
-
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-09 06:56:37 +0000