--- /dev/null
+/*
+ * net/tipc/link.c: TIPC link code
+ *
+ * Copyright (c) 1996-2007, 2012-2015, Ericsson AB
+ * Copyright (c) 2004-2007, 2010-2013, Wind River Systems
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. Neither the names of the copyright holders nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL") version 2 as published by the Free
+ * Software Foundation.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "core.h"
+#include "subscr.h"
+#include "link.h"
+#include "bcast.h"
+#include "socket.h"
+#include "name_distr.h"
+#include "discover.h"
+#include "netlink.h"
+
+#include <linux/pkt_sched.h>
+
+/*
+ * Error message prefixes
+ */
+static const char *link_co_err = "Link changeover error, ";
+static const char *link_rst_msg = "Resetting link ";
+static const char *link_unk_evt = "Unknown link event ";
+
+static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
+ [TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
+ [TIPC_NLA_LINK_NAME] = {
+ .type = NLA_STRING,
+ .len = TIPC_MAX_LINK_NAME
+ },
+ [TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
+ [TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
+ [TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
+ [TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
+ [TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
+ [TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
+ [TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
+ [TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
+};
+
+/* Properties valid for media, bearar and link */
+static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
+ [TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
+ [TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
+ [TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
+ [TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
+};
+
+/*
+ * Out-of-range value for link session numbers
+ */
+#define INVALID_SESSION 0x10000
+
+/*
+ * Link state events:
+ */
+#define STARTING_EVT 856384768 /* link processing trigger */
+#define TRAFFIC_MSG_EVT 560815u /* rx'd ??? */
+#define TIMEOUT_EVT 560817u /* link timer expired */
+
+/*
+ * State value stored in 'failover_pkts'
+ */
+#define FIRST_FAILOVER 0xffffu
+
+static void link_handle_out_of_seq_msg(struct tipc_link *link,
+ struct sk_buff *skb);
+static void tipc_link_proto_rcv(struct tipc_link *link,
+ struct sk_buff *skb);
+static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol);
+static void link_state_event(struct tipc_link *l_ptr, u32 event);
+static void link_reset_statistics(struct tipc_link *l_ptr);
+static void link_print(struct tipc_link *l_ptr, const char *str);
+static void tipc_link_sync_xmit(struct tipc_link *l);
+static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
+static void tipc_link_input(struct tipc_link *l, struct sk_buff *skb);
+static bool tipc_data_input(struct tipc_link *l, struct sk_buff *skb);
+static bool tipc_link_failover_rcv(struct tipc_link *l, struct sk_buff **skb);
+/*
+ * Simple link routines
+ */
+static unsigned int align(unsigned int i)
+{
+ return (i + 3) & ~3u;
+}
+
+static void tipc_link_release(struct kref *kref)
+{
+ kfree(container_of(kref, struct tipc_link, ref));
+}
+
+static void tipc_link_get(struct tipc_link *l_ptr)
+{
+ kref_get(&l_ptr->ref);
+}
+
+static void tipc_link_put(struct tipc_link *l_ptr)
+{
+ kref_put(&l_ptr->ref, tipc_link_release);
+}
+
+static struct tipc_link *tipc_parallel_link(struct tipc_link *l)
+{
+ if (l->owner->active_links[0] != l)
+ return l->owner->active_links[0];
+ return l->owner->active_links[1];
+}
+
+/*
+ * Simple non-static link routines (i.e. referenced outside this file)
+ */
+int tipc_link_is_up(struct tipc_link *l_ptr)
+{
+ if (!l_ptr)
+ return 0;
+ return link_working_working(l_ptr) || link_working_unknown(l_ptr);
+}
+
+int tipc_link_is_active(struct tipc_link *l_ptr)
+{
+ return (l_ptr->owner->active_links[0] == l_ptr) ||
+ (l_ptr->owner->active_links[1] == l_ptr);
+}
+
+/**
+ * link_timeout - handle expiration of link timer
+ * @l_ptr: pointer to link
+ */
+static void link_timeout(unsigned long data)
+{
+ struct tipc_link *l_ptr = (struct tipc_link *)data;
+ struct sk_buff *skb;
+
+ tipc_node_lock(l_ptr->owner);
+
+ /* update counters used in statistical profiling of send traffic */
+ l_ptr->stats.accu_queue_sz += skb_queue_len(&l_ptr->transmq);
+ l_ptr->stats.queue_sz_counts++;
+
+ skb = skb_peek(&l_ptr->transmq);
+ if (skb) {
+ struct tipc_msg *msg = buf_msg(skb);
+ u32 length = msg_size(msg);
+
+ if ((msg_user(msg) == MSG_FRAGMENTER) &&
+ (msg_type(msg) == FIRST_FRAGMENT)) {
+ length = msg_size(msg_get_wrapped(msg));
+ }
+ if (length) {
+ l_ptr->stats.msg_lengths_total += length;
+ l_ptr->stats.msg_length_counts++;
+ if (length <= 64)
+ l_ptr->stats.msg_length_profile[0]++;
+ else if (length <= 256)
+ l_ptr->stats.msg_length_profile[1]++;
+ else if (length <= 1024)
+ l_ptr->stats.msg_length_profile[2]++;
+ else if (length <= 4096)
+ l_ptr->stats.msg_length_profile[3]++;
+ else if (length <= 16384)
+ l_ptr->stats.msg_length_profile[4]++;
+ else if (length <= 32768)
+ l_ptr->stats.msg_length_profile[5]++;
+ else
+ l_ptr->stats.msg_length_profile[6]++;
+ }
+ }
+
+ /* do all other link processing performed on a periodic basis */
+ link_state_event(l_ptr, TIMEOUT_EVT);
+
+ if (skb_queue_len(&l_ptr->backlogq))
+ tipc_link_push_packets(l_ptr);
+
+ tipc_node_unlock(l_ptr->owner);
+ tipc_link_put(l_ptr);
+}
+
+static void link_set_timer(struct tipc_link *link, unsigned long time)
+{
+ if (!mod_timer(&link->timer, jiffies + time))
+ tipc_link_get(link);
+}
+
+/**
+ * tipc_link_create - create a new link
+ * @n_ptr: pointer to associated node
+ * @b_ptr: pointer to associated bearer
+ * @media_addr: media address to use when sending messages over link
+ *
+ * Returns pointer to link.
+ */
+struct tipc_link *tipc_link_create(struct tipc_node *n_ptr,
+ struct tipc_bearer *b_ptr,
+ const struct tipc_media_addr *media_addr)
+{
+ struct tipc_net *tn = net_generic(n_ptr->net, tipc_net_id);
+ struct tipc_link *l_ptr;
+ struct tipc_msg *msg;
+ char *if_name;
+ char addr_string[16];
+ u32 peer = n_ptr->addr;
+
+ if (n_ptr->link_cnt >= MAX_BEARERS) {
+ tipc_addr_string_fill(addr_string, n_ptr->addr);
+ pr_err("Attempt to establish %uth link to %s. Max %u allowed.\n",
+ n_ptr->link_cnt, addr_string, MAX_BEARERS);
+ return NULL;
+ }
+
+ if (n_ptr->links[b_ptr->identity]) {
+ tipc_addr_string_fill(addr_string, n_ptr->addr);
+ pr_err("Attempt to establish second link on <%s> to %s\n",
+ b_ptr->name, addr_string);
+ return NULL;
+ }
+
+ l_ptr = kzalloc(sizeof(*l_ptr), GFP_ATOMIC);
+ if (!l_ptr) {
+ pr_warn("Link creation failed, no memory\n");
+ return NULL;
+ }
+ kref_init(&l_ptr->ref);
+ l_ptr->addr = peer;
+ if_name = strchr(b_ptr->name, ':') + 1;
+ sprintf(l_ptr->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
+ tipc_zone(tn->own_addr), tipc_cluster(tn->own_addr),
+ tipc_node(tn->own_addr),
+ if_name,
+ tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
+ /* note: peer i/f name is updated by reset/activate message */
+ memcpy(&l_ptr->media_addr, media_addr, sizeof(*media_addr));
+ l_ptr->owner = n_ptr;
+ l_ptr->checkpoint = 1;
+ l_ptr->peer_session = INVALID_SESSION;
+ l_ptr->bearer_id = b_ptr->identity;
+ link_set_supervision_props(l_ptr, b_ptr->tolerance);
+ l_ptr->state = RESET_UNKNOWN;
+
+ l_ptr->pmsg = (struct tipc_msg *)&l_ptr->proto_msg;
+ msg = l_ptr->pmsg;
+ tipc_msg_init(tn->own_addr, msg, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE,
+ l_ptr->addr);
+ msg_set_size(msg, sizeof(l_ptr->proto_msg));
+ msg_set_session(msg, (tn->random & 0xffff));
+ msg_set_bearer_id(msg, b_ptr->identity);
+ strcpy((char *)msg_data(msg), if_name);
+ l_ptr->net_plane = b_ptr->net_plane;
+ l_ptr->advertised_mtu = b_ptr->mtu;
+ l_ptr->mtu = l_ptr->advertised_mtu;
+ l_ptr->priority = b_ptr->priority;
+ tipc_link_set_queue_limits(l_ptr, b_ptr->window);
+ l_ptr->next_out_no = 1;
+ __skb_queue_head_init(&l_ptr->transmq);
+ __skb_queue_head_init(&l_ptr->backlogq);
+ __skb_queue_head_init(&l_ptr->deferdq);
+ skb_queue_head_init(&l_ptr->wakeupq);
+ skb_queue_head_init(&l_ptr->inputq);
+ skb_queue_head_init(&l_ptr->namedq);
+ link_reset_statistics(l_ptr);
+ tipc_node_attach_link(n_ptr, l_ptr);
+ setup_timer(&l_ptr->timer, link_timeout, (unsigned long)l_ptr);
+ link_state_event(l_ptr, STARTING_EVT);
+
+ return l_ptr;
+}
+
+/**
+ * tipc_link_delete - Delete a link
+ * @l: link to be deleted
+ */
+void tipc_link_delete(struct tipc_link *l)
+{
+ tipc_link_reset(l);
+ if (del_timer(&l->timer))
+ tipc_link_put(l);
+ l->flags |= LINK_STOPPED;
+ /* Delete link now, or when timer is finished: */
+ tipc_link_reset_fragments(l);
+ tipc_node_detach_link(l->owner, l);
+ tipc_link_put(l);
+}
+
+void tipc_link_delete_list(struct net *net, unsigned int bearer_id,
+ bool shutting_down)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_link *link;
+ struct tipc_node *node;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(node, &tn->node_list, list) {
+ tipc_node_lock(node);
+ link = node->links[bearer_id];
+ if (link)
+ tipc_link_delete(link);
+ tipc_node_unlock(node);
+ }
+ rcu_read_unlock();
+}
+
+/**
+ * link_schedule_user - schedule a message sender for wakeup after congestion
+ * @link: congested link
+ * @list: message that was attempted sent
+ * Create pseudo msg to send back to user when congestion abates
+ * Only consumes message if there is an error
+ */
+static int link_schedule_user(struct tipc_link *link, struct sk_buff_head *list)
+{
+ struct tipc_msg *msg = buf_msg(skb_peek(list));
+ int imp = msg_importance(msg);
+ u32 oport = msg_origport(msg);
+ u32 addr = link_own_addr(link);
+ struct sk_buff *skb;
+
+ /* This really cannot happen... */
+ if (unlikely(imp > TIPC_CRITICAL_IMPORTANCE)) {
+ pr_warn("%s<%s>, send queue full", link_rst_msg, link->name);
+ tipc_link_reset(link);
+ goto err;
+ }
+ /* Non-blocking sender: */
+ if (TIPC_SKB_CB(skb_peek(list))->wakeup_pending)
+ return -ELINKCONG;
+
+ /* Create and schedule wakeup pseudo message */
+ skb = tipc_msg_create(SOCK_WAKEUP, 0, INT_H_SIZE, 0,
+ addr, addr, oport, 0, 0);
+ if (!skb)
+ goto err;
+ TIPC_SKB_CB(skb)->chain_sz = skb_queue_len(list);
+ TIPC_SKB_CB(skb)->chain_imp = imp;
+ skb_queue_tail(&link->wakeupq, skb);
+ link->stats.link_congs++;
+ return -ELINKCONG;
+err:
+ __skb_queue_purge(list);
+ return -ENOBUFS;
+}
+
+/**
+ * link_prepare_wakeup - prepare users for wakeup after congestion
+ * @link: congested link
+ * Move a number of waiting users, as permitted by available space in
+ * the send queue, from link wait queue to node wait queue for wakeup
+ */
+void link_prepare_wakeup(struct tipc_link *l)
+{
+ int pnd[TIPC_SYSTEM_IMPORTANCE + 1] = {0,};
+ int imp, lim;
+ struct sk_buff *skb, *tmp;
+
+ skb_queue_walk_safe(&l->wakeupq, skb, tmp) {
+ imp = TIPC_SKB_CB(skb)->chain_imp;
+ lim = l->window + l->backlog[imp].limit;
+ pnd[imp] += TIPC_SKB_CB(skb)->chain_sz;
+ if ((pnd[imp] + l->backlog[imp].len) >= lim)
+ break;
+ skb_unlink(skb, &l->wakeupq);
+ skb_queue_tail(&l->inputq, skb);
+ l->owner->inputq = &l->inputq;
+ l->owner->action_flags |= TIPC_MSG_EVT;
+ }
+}
+
+/**
+ * tipc_link_reset_fragments - purge link's inbound message fragments queue
+ * @l_ptr: pointer to link
+ */
+void tipc_link_reset_fragments(struct tipc_link *l_ptr)
+{
+ kfree_skb(l_ptr->reasm_buf);
+ l_ptr->reasm_buf = NULL;
+}
+
+static void tipc_link_purge_backlog(struct tipc_link *l)
+{
+ __skb_queue_purge(&l->backlogq);
+ l->backlog[TIPC_LOW_IMPORTANCE].len = 0;
+ l->backlog[TIPC_MEDIUM_IMPORTANCE].len = 0;
+ l->backlog[TIPC_HIGH_IMPORTANCE].len = 0;
+ l->backlog[TIPC_CRITICAL_IMPORTANCE].len = 0;
+ l->backlog[TIPC_SYSTEM_IMPORTANCE].len = 0;
+}
+
+/**
+ * tipc_link_purge_queues - purge all pkt queues associated with link
+ * @l_ptr: pointer to link
+ */
+void tipc_link_purge_queues(struct tipc_link *l_ptr)
+{
+ __skb_queue_purge(&l_ptr->deferdq);
+ __skb_queue_purge(&l_ptr->transmq);
+ tipc_link_purge_backlog(l_ptr);
+ tipc_link_reset_fragments(l_ptr);
+}
+
+void tipc_link_reset(struct tipc_link *l_ptr)
+{
+ u32 prev_state = l_ptr->state;
+ int was_active_link = tipc_link_is_active(l_ptr);
+ struct tipc_node *owner = l_ptr->owner;
+ struct tipc_link *pl = tipc_parallel_link(l_ptr);
+
+ msg_set_session(l_ptr->pmsg, ((msg_session(l_ptr->pmsg) + 1) & 0xffff));
+
+ /* Link is down, accept any session */
+ l_ptr->peer_session = INVALID_SESSION;
+
+ /* Prepare for renewed mtu size negotiation */
+ l_ptr->mtu = l_ptr->advertised_mtu;
+
+ l_ptr->state = RESET_UNKNOWN;
+
+ if ((prev_state == RESET_UNKNOWN) || (prev_state == RESET_RESET))
+ return;
+
+ tipc_node_link_down(l_ptr->owner, l_ptr);
+ tipc_bearer_remove_dest(owner->net, l_ptr->bearer_id, l_ptr->addr);
+
+ if (was_active_link && tipc_node_is_up(l_ptr->owner) && (pl != l_ptr)) {
+ l_ptr->flags |= LINK_FAILINGOVER;
+ l_ptr->failover_checkpt = l_ptr->next_in_no;
+ pl->failover_pkts = FIRST_FAILOVER;
+ pl->failover_checkpt = l_ptr->next_in_no;
+ pl->failover_skb = l_ptr->reasm_buf;
+ } else {
+ kfree_skb(l_ptr->reasm_buf);
+ }
+ /* Clean up all queues, except inputq: */
+ __skb_queue_purge(&l_ptr->transmq);
+ __skb_queue_purge(&l_ptr->deferdq);
+ if (!owner->inputq)
+ owner->inputq = &l_ptr->inputq;
+ skb_queue_splice_init(&l_ptr->wakeupq, owner->inputq);
+ if (!skb_queue_empty(owner->inputq))
+ owner->action_flags |= TIPC_MSG_EVT;
+ tipc_link_purge_backlog(l_ptr);
+ l_ptr->reasm_buf = NULL;
+ l_ptr->rcv_unacked = 0;
+ l_ptr->checkpoint = 1;
+ l_ptr->next_out_no = 1;
+ l_ptr->fsm_msg_cnt = 0;
+ l_ptr->stale_count = 0;
+ link_reset_statistics(l_ptr);
+}
+
+void tipc_link_reset_list(struct net *net, unsigned int bearer_id)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_link *l_ptr;
+ struct tipc_node *n_ptr;
+
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
+ tipc_node_lock(n_ptr);
+ l_ptr = n_ptr->links[bearer_id];
+ if (l_ptr)
+ tipc_link_reset(l_ptr);
+ tipc_node_unlock(n_ptr);
+ }
+ rcu_read_unlock();
+}
+
+static void link_activate(struct tipc_link *link)
+{
+ struct tipc_node *node = link->owner;
+
+ link->next_in_no = 1;
+ link->stats.recv_info = 1;
+ tipc_node_link_up(node, link);
+ tipc_bearer_add_dest(node->net, link->bearer_id, link->addr);
+}
+
+/**
+ * link_state_event - link finite state machine
+ * @l_ptr: pointer to link
+ * @event: state machine event to process
+ */
+static void link_state_event(struct tipc_link *l_ptr, unsigned int event)
+{
+ struct tipc_link *other;
+ unsigned long cont_intv = l_ptr->cont_intv;
+
+ if (l_ptr->flags & LINK_STOPPED)
+ return;
+
+ if (!(l_ptr->flags & LINK_STARTED) && (event != STARTING_EVT))
+ return; /* Not yet. */
+
+ if (l_ptr->flags & LINK_FAILINGOVER) {
+ if (event == TIMEOUT_EVT)
+ link_set_timer(l_ptr, cont_intv);
+ return;
+ }
+
+ switch (l_ptr->state) {
+ case WORKING_WORKING:
+ switch (event) {
+ case TRAFFIC_MSG_EVT:
+ case ACTIVATE_MSG:
+ break;
+ case TIMEOUT_EVT:
+ if (l_ptr->next_in_no != l_ptr->checkpoint) {
+ l_ptr->checkpoint = l_ptr->next_in_no;
+ if (tipc_bclink_acks_missing(l_ptr->owner)) {
+ tipc_link_proto_xmit(l_ptr, STATE_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ }
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ }
+ l_ptr->state = WORKING_UNKNOWN;
+ l_ptr->fsm_msg_cnt = 0;
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv / 4);
+ break;
+ case RESET_MSG:
+ pr_debug("%s<%s>, requested by peer\n",
+ link_rst_msg, l_ptr->name);
+ tipc_link_reset(l_ptr);
+ l_ptr->state = RESET_RESET;
+ l_ptr->fsm_msg_cnt = 0;
+ tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ default:
+ pr_debug("%s%u in WW state\n", link_unk_evt, event);
+ }
+ break;
+ case WORKING_UNKNOWN:
+ switch (event) {
+ case TRAFFIC_MSG_EVT:
+ case ACTIVATE_MSG:
+ l_ptr->state = WORKING_WORKING;
+ l_ptr->fsm_msg_cnt = 0;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case RESET_MSG:
+ pr_debug("%s<%s>, requested by peer while probing\n",
+ link_rst_msg, l_ptr->name);
+ tipc_link_reset(l_ptr);
+ l_ptr->state = RESET_RESET;
+ l_ptr->fsm_msg_cnt = 0;
+ tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case TIMEOUT_EVT:
+ if (l_ptr->next_in_no != l_ptr->checkpoint) {
+ l_ptr->state = WORKING_WORKING;
+ l_ptr->fsm_msg_cnt = 0;
+ l_ptr->checkpoint = l_ptr->next_in_no;
+ if (tipc_bclink_acks_missing(l_ptr->owner)) {
+ tipc_link_proto_xmit(l_ptr, STATE_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ }
+ link_set_timer(l_ptr, cont_intv);
+ } else if (l_ptr->fsm_msg_cnt < l_ptr->abort_limit) {
+ tipc_link_proto_xmit(l_ptr, STATE_MSG,
+ 1, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv / 4);
+ } else { /* Link has failed */
+ pr_debug("%s<%s>, peer not responding\n",
+ link_rst_msg, l_ptr->name);
+ tipc_link_reset(l_ptr);
+ l_ptr->state = RESET_UNKNOWN;
+ l_ptr->fsm_msg_cnt = 0;
+ tipc_link_proto_xmit(l_ptr, RESET_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ }
+ break;
+ default:
+ pr_err("%s%u in WU state\n", link_unk_evt, event);
+ }
+ break;
+ case RESET_UNKNOWN:
+ switch (event) {
+ case TRAFFIC_MSG_EVT:
+ break;
+ case ACTIVATE_MSG:
+ other = l_ptr->owner->active_links[0];
+ if (other && link_working_unknown(other))
+ break;
+ l_ptr->state = WORKING_WORKING;
+ l_ptr->fsm_msg_cnt = 0;
+ link_activate(l_ptr);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ if (l_ptr->owner->working_links == 1)
+ tipc_link_sync_xmit(l_ptr);
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case RESET_MSG:
+ l_ptr->state = RESET_RESET;
+ l_ptr->fsm_msg_cnt = 0;
+ tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
+ 1, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case STARTING_EVT:
+ l_ptr->flags |= LINK_STARTED;
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case TIMEOUT_EVT:
+ tipc_link_proto_xmit(l_ptr, RESET_MSG, 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ default:
+ pr_err("%s%u in RU state\n", link_unk_evt, event);
+ }
+ break;
+ case RESET_RESET:
+ switch (event) {
+ case TRAFFIC_MSG_EVT:
+ case ACTIVATE_MSG:
+ other = l_ptr->owner->active_links[0];
+ if (other && link_working_unknown(other))
+ break;
+ l_ptr->state = WORKING_WORKING;
+ l_ptr->fsm_msg_cnt = 0;
+ link_activate(l_ptr);
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 1, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ if (l_ptr->owner->working_links == 1)
+ tipc_link_sync_xmit(l_ptr);
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ case RESET_MSG:
+ break;
+ case TIMEOUT_EVT:
+ tipc_link_proto_xmit(l_ptr, ACTIVATE_MSG,
+ 0, 0, 0, 0);
+ l_ptr->fsm_msg_cnt++;
+ link_set_timer(l_ptr, cont_intv);
+ break;
+ default:
+ pr_err("%s%u in RR state\n", link_unk_evt, event);
+ }
+ break;
+ default:
+ pr_err("Unknown link state %u/%u\n", l_ptr->state, event);
+ }
+}
+
+/**
+ * __tipc_link_xmit(): same as tipc_link_xmit, but destlink is known & locked
+ * @link: link to use
+ * @list: chain of buffers containing message
+ *
+ * Consumes the buffer chain, except when returning -ELINKCONG,
+ * since the caller then may want to make more send attempts.
+ * Returns 0 if success, or errno: -ELINKCONG, -EMSGSIZE or -ENOBUFS
+ * Messages at TIPC_SYSTEM_IMPORTANCE are always accepted
+ */
+int __tipc_link_xmit(struct net *net, struct tipc_link *link,
+ struct sk_buff_head *list)
+{
+ struct tipc_msg *msg = buf_msg(skb_peek(list));
+ unsigned int maxwin = link->window;
+ unsigned int imp = msg_importance(msg);
+ uint mtu = link->mtu;
+ uint ack = mod(link->next_in_no - 1);
+ uint seqno = link->next_out_no;
+ uint bc_last_in = link->owner->bclink.last_in;
+ struct tipc_media_addr *addr = &link->media_addr;
+ struct sk_buff_head *transmq = &link->transmq;
+ struct sk_buff_head *backlogq = &link->backlogq;
+ struct sk_buff *skb, *tmp;
+
+ /* Match backlog limit against msg importance: */
+ if (unlikely(link->backlog[imp].len >= link->backlog[imp].limit))
+ return link_schedule_user(link, list);
+
+ if (unlikely(msg_size(msg) > mtu)) {
+ __skb_queue_purge(list);
+ return -EMSGSIZE;
+ }
+ /* Prepare each packet for sending, and add to relevant queue: */
+ skb_queue_walk_safe(list, skb, tmp) {
+ __skb_unlink(skb, list);
+ msg = buf_msg(skb);
+ msg_set_seqno(msg, seqno);
+ msg_set_ack(msg, ack);
+ msg_set_bcast_ack(msg, bc_last_in);
+
+ if (likely(skb_queue_len(transmq) < maxwin)) {
+ __skb_queue_tail(transmq, skb);
+ tipc_bearer_send(net, link->bearer_id, skb, addr);
+ link->rcv_unacked = 0;
+ seqno++;
+ continue;
+ }
+ if (tipc_msg_bundle(skb_peek_tail(backlogq), skb, mtu)) {
+ link->stats.sent_bundled++;
+ continue;
+ }
+ if (tipc_msg_make_bundle(&skb, mtu, link->addr)) {
+ link->stats.sent_bundled++;
+ link->stats.sent_bundles++;
+ imp = msg_importance(buf_msg(skb));
+ }
+ __skb_queue_tail(backlogq, skb);
+ link->backlog[imp].len++;
+ seqno++;
+ }
+ link->next_out_no = seqno;
+ return 0;
+}
+
+static void skb2list(struct sk_buff *skb, struct sk_buff_head *list)
+{
+ skb_queue_head_init(list);
+ __skb_queue_tail(list, skb);
+}
+
+static int __tipc_link_xmit_skb(struct tipc_link *link, struct sk_buff *skb)
+{
+ struct sk_buff_head head;
+
+ skb2list(skb, &head);
+ return __tipc_link_xmit(link->owner->net, link, &head);
+}
+
+/* tipc_link_xmit_skb(): send single buffer to destination
+ * Buffers sent via this functon are generally TIPC_SYSTEM_IMPORTANCE
+ * messages, which will not be rejected
+ * The only exception is datagram messages rerouted after secondary
+ * lookup, which are rare and safe to dispose of anyway.
+ * TODO: Return real return value, and let callers use
+ * tipc_wait_for_sendpkt() where applicable
+ */
+int tipc_link_xmit_skb(struct net *net, struct sk_buff *skb, u32 dnode,
+ u32 selector)
+{
+ struct sk_buff_head head;
+ int rc;
+
+ skb2list(skb, &head);
+ rc = tipc_link_xmit(net, &head, dnode, selector);
+ if (rc == -ELINKCONG)
+ kfree_skb(skb);
+ return 0;
+}
+
+/**
+ * tipc_link_xmit() is the general link level function for message sending
+ * @net: the applicable net namespace
+ * @list: chain of buffers containing message
+ * @dsz: amount of user data to be sent
+ * @dnode: address of destination node
+ * @selector: a number used for deterministic link selection
+ * Consumes the buffer chain, except when returning -ELINKCONG
+ * Returns 0 if success, otherwise errno: -ELINKCONG,-EHOSTUNREACH,-EMSGSIZE
+ */
+int tipc_link_xmit(struct net *net, struct sk_buff_head *list, u32 dnode,
+ u32 selector)
+{
+ struct tipc_link *link = NULL;
+ struct tipc_node *node;
+ int rc = -EHOSTUNREACH;
+
+ node = tipc_node_find(net, dnode);
+ if (node) {
+ tipc_node_lock(node);
+ link = node->active_links[selector & 1];
+ if (link)
+ rc = __tipc_link_xmit(net, link, list);
+ tipc_node_unlock(node);
+ tipc_node_put(node);
+ }
+ if (link)
+ return rc;
+
+ if (likely(in_own_node(net, dnode))) {
+ tipc_sk_rcv(net, list);
+ return 0;
+ }
+
+ __skb_queue_purge(list);
+ return rc;
+}
+
+/*
+ * tipc_link_sync_xmit - synchronize broadcast link endpoints.
+ *
+ * Give a newly added peer node the sequence number where it should
+ * start receiving and acking broadcast packets.
+ *
+ * Called with node locked
+ */
+static void tipc_link_sync_xmit(struct tipc_link *link)
+{
+ struct sk_buff *skb;
+ struct tipc_msg *msg;
+
+ skb = tipc_buf_acquire(INT_H_SIZE);
+ if (!skb)
+ return;
+
+ msg = buf_msg(skb);
+ tipc_msg_init(link_own_addr(link), msg, BCAST_PROTOCOL, STATE_MSG,
+ INT_H_SIZE, link->addr);
+ msg_set_last_bcast(msg, link->owner->bclink.acked);
+ __tipc_link_xmit_skb(link, skb);
+}
+
+/*
+ * tipc_link_sync_rcv - synchronize broadcast link endpoints.
+ * Receive the sequence number where we should start receiving and
+ * acking broadcast packets from a newly added peer node, and open
+ * up for reception of such packets.
+ *
+ * Called with node locked
+ */
+static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf)
+{
+ struct tipc_msg *msg = buf_msg(buf);
+
+ n->bclink.last_sent = n->bclink.last_in = msg_last_bcast(msg);
+ n->bclink.recv_permitted = true;
+ kfree_skb(buf);
+}
+
+/*
+ * tipc_link_push_packets - push unsent packets to bearer
+ *
+ * Push out the unsent messages of a link where congestion
+ * has abated. Node is locked.
+ *
+ * Called with node locked
+ */
+void tipc_link_push_packets(struct tipc_link *link)
+{
+ struct sk_buff *skb;
+ struct tipc_msg *msg;
+ unsigned int ack = mod(link->next_in_no - 1);
+
+ while (skb_queue_len(&link->transmq) < link->window) {
+ skb = __skb_dequeue(&link->backlogq);
+ if (!skb)
+ break;
+ msg = buf_msg(skb);
+ link->backlog[msg_importance(msg)].len--;
+ msg_set_ack(msg, ack);
+ msg_set_bcast_ack(msg, link->owner->bclink.last_in);
+ link->rcv_unacked = 0;
+ __skb_queue_tail(&link->transmq, skb);
+ tipc_bearer_send(link->owner->net, link->bearer_id,
+ skb, &link->media_addr);
+ }
+}
+
+void tipc_link_reset_all(struct tipc_node *node)
+{
+ char addr_string[16];
+ u32 i;
+
+ tipc_node_lock(node);
+
+ pr_warn("Resetting all links to %s\n",
+ tipc_addr_string_fill(addr_string, node->addr));
+
+ for (i = 0; i < MAX_BEARERS; i++) {
+ if (node->links[i]) {
+ link_print(node->links[i], "Resetting link\n");
+ tipc_link_reset(node->links[i]);
+ }
+ }
+
+ tipc_node_unlock(node);
+}
+
+static void link_retransmit_failure(struct tipc_link *l_ptr,
+ struct sk_buff *buf)
+{
+ struct tipc_msg *msg = buf_msg(buf);
+ struct net *net = l_ptr->owner->net;
+
+ pr_warn("Retransmission failure on link <%s>\n", l_ptr->name);
+
+ if (l_ptr->addr) {
+ /* Handle failure on standard link */
+ link_print(l_ptr, "Resetting link\n");
+ tipc_link_reset(l_ptr);
+
+ } else {
+ /* Handle failure on broadcast link */
+ struct tipc_node *n_ptr;
+ char addr_string[16];
+
+ pr_info("Msg seq number: %u, ", msg_seqno(msg));
+ pr_cont("Outstanding acks: %lu\n",
+ (unsigned long) TIPC_SKB_CB(buf)->handle);
+
+ n_ptr = tipc_bclink_retransmit_to(net);
+
+ tipc_addr_string_fill(addr_string, n_ptr->addr);
+ pr_info("Broadcast link info for %s\n", addr_string);
+ pr_info("Reception permitted: %d, Acked: %u\n",
+ n_ptr->bclink.recv_permitted,
+ n_ptr->bclink.acked);
+ pr_info("Last in: %u, Oos state: %u, Last sent: %u\n",
+ n_ptr->bclink.last_in,
+ n_ptr->bclink.oos_state,
+ n_ptr->bclink.last_sent);
+
+ n_ptr->action_flags |= TIPC_BCAST_RESET;
+ l_ptr->stale_count = 0;
+ }
+}
+
+void tipc_link_retransmit(struct tipc_link *l_ptr, struct sk_buff *skb,
+ u32 retransmits)
+{
+ struct tipc_msg *msg;
+
+ if (!skb)
+ return;
+
+ msg = buf_msg(skb);
+
+ /* Detect repeated retransmit failures */
+ if (l_ptr->last_retransmitted == msg_seqno(msg)) {
+ if (++l_ptr->stale_count > 100) {
+ link_retransmit_failure(l_ptr, skb);
+ return;
+ }
+ } else {
+ l_ptr->last_retransmitted = msg_seqno(msg);
+ l_ptr->stale_count = 1;
+ }
+
+ skb_queue_walk_from(&l_ptr->transmq, skb) {
+ if (!retransmits)
+ break;
+ msg = buf_msg(skb);
+ msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
+ msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
+ tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, skb,
+ &l_ptr->media_addr);
+ retransmits--;
+ l_ptr->stats.retransmitted++;
+ }
+}
+
+/* link_synch(): check if all packets arrived before the synch
+ * point have been consumed
+ * Returns true if the parallel links are synched, otherwise false
+ */
+static bool link_synch(struct tipc_link *l)
+{
+ unsigned int post_synch;
+ struct tipc_link *pl;
+
+ pl = tipc_parallel_link(l);
+ if (pl == l)
+ goto synched;
+
+ /* Was last pre-synch packet added to input queue ? */
+ if (less_eq(pl->next_in_no, l->synch_point))
+ return false;
+
+ /* Is it still in the input queue ? */
+ post_synch = mod(pl->next_in_no - l->synch_point) - 1;
+ if (skb_queue_len(&pl->inputq) > post_synch)
+ return false;
+synched:
+ l->flags &= ~LINK_SYNCHING;
+ return true;
+}
+
+static void link_retrieve_defq(struct tipc_link *link,
+ struct sk_buff_head *list)
+{
+ u32 seq_no;
+
+ if (skb_queue_empty(&link->deferdq))
+ return;
+
+ seq_no = buf_seqno(skb_peek(&link->deferdq));
+ if (seq_no == mod(link->next_in_no))
+ skb_queue_splice_tail_init(&link->deferdq, list);
+}
+
+/**
+ * tipc_rcv - process TIPC packets/messages arriving from off-node
+ * @net: the applicable net namespace
+ * @skb: TIPC packet
+ * @b_ptr: pointer to bearer message arrived on
+ *
+ * Invoked with no locks held. Bearer pointer must point to a valid bearer
+ * structure (i.e. cannot be NULL), but bearer can be inactive.
+ */
+void tipc_rcv(struct net *net, struct sk_buff *skb, struct tipc_bearer *b_ptr)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct sk_buff_head head;
+ struct tipc_node *n_ptr;
+ struct tipc_link *l_ptr;
+ struct sk_buff *skb1, *tmp;
+ struct tipc_msg *msg;
+ u32 seq_no;
+ u32 ackd;
+ u32 released;
+
+ skb2list(skb, &head);
+
+ while ((skb = __skb_dequeue(&head))) {
+ /* Ensure message is well-formed */
+ if (unlikely(!tipc_msg_validate(skb)))
+ goto discard;
+
+ /* Handle arrival of a non-unicast link message */
+ msg = buf_msg(skb);
+ if (unlikely(msg_non_seq(msg))) {
+ if (msg_user(msg) == LINK_CONFIG)
+ tipc_disc_rcv(net, skb, b_ptr);
+ else
+ tipc_bclink_rcv(net, skb);
+ continue;
+ }
+
+ /* Discard unicast link messages destined for another node */
+ if (unlikely(!msg_short(msg) &&
+ (msg_destnode(msg) != tn->own_addr)))
+ goto discard;
+
+ /* Locate neighboring node that sent message */
+ n_ptr = tipc_node_find(net, msg_prevnode(msg));
+ if (unlikely(!n_ptr))
+ goto discard;
+
+ tipc_node_lock(n_ptr);
+ /* Locate unicast link endpoint that should handle message */
+ l_ptr = n_ptr->links[b_ptr->identity];
+ if (unlikely(!l_ptr))
+ goto unlock;
+
+ /* Verify that communication with node is currently allowed */
+ if ((n_ptr->action_flags & TIPC_WAIT_PEER_LINKS_DOWN) &&
+ msg_user(msg) == LINK_PROTOCOL &&
+ (msg_type(msg) == RESET_MSG ||
+ msg_type(msg) == ACTIVATE_MSG) &&
+ !msg_redundant_link(msg))
+ n_ptr->action_flags &= ~TIPC_WAIT_PEER_LINKS_DOWN;
+
+ if (tipc_node_blocked(n_ptr))
+ goto unlock;
+
+ /* Validate message sequence number info */
+ seq_no = msg_seqno(msg);
+ ackd = msg_ack(msg);
+
+ /* Release acked messages */
+ if (unlikely(n_ptr->bclink.acked != msg_bcast_ack(msg)))
+ tipc_bclink_acknowledge(n_ptr, msg_bcast_ack(msg));
+
+ released = 0;
+ skb_queue_walk_safe(&l_ptr->transmq, skb1, tmp) {
+ if (more(buf_seqno(skb1), ackd))
+ break;
+ __skb_unlink(skb1, &l_ptr->transmq);
+ kfree_skb(skb1);
+ released = 1;
+ }
+
+ /* Try sending any messages link endpoint has pending */
+ if (unlikely(skb_queue_len(&l_ptr->backlogq)))
+ tipc_link_push_packets(l_ptr);
+
+ if (released && !skb_queue_empty(&l_ptr->wakeupq))
+ link_prepare_wakeup(l_ptr);
+
+ /* Process the incoming packet */
+ if (unlikely(!link_working_working(l_ptr))) {
+ if (msg_user(msg) == LINK_PROTOCOL) {
+ tipc_link_proto_rcv(l_ptr, skb);
+ link_retrieve_defq(l_ptr, &head);
+ skb = NULL;
+ goto unlock;
+ }
+
+ /* Traffic message. Conditionally activate link */
+ link_state_event(l_ptr, TRAFFIC_MSG_EVT);
+
+ if (link_working_working(l_ptr)) {
+ /* Re-insert buffer in front of queue */
+ __skb_queue_head(&head, skb);
+ skb = NULL;
+ goto unlock;
+ }
+ goto unlock;
+ }
+
+ /* Link is now in state WORKING_WORKING */
+ if (unlikely(seq_no != mod(l_ptr->next_in_no))) {
+ link_handle_out_of_seq_msg(l_ptr, skb);
+ link_retrieve_defq(l_ptr, &head);
+ skb = NULL;
+ goto unlock;
+ }
+ /* Synchronize with parallel link if applicable */
+ if (unlikely((l_ptr->flags & LINK_SYNCHING) && !msg_dup(msg))) {
+ if (!link_synch(l_ptr))
+ goto unlock;
+ }
+ l_ptr->next_in_no++;
+ if (unlikely(!skb_queue_empty(&l_ptr->deferdq)))
+ link_retrieve_defq(l_ptr, &head);
+ if (unlikely(++l_ptr->rcv_unacked >= TIPC_MIN_LINK_WIN)) {
+ l_ptr->stats.sent_acks++;
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
+ }
+ tipc_link_input(l_ptr, skb);
+ skb = NULL;
+unlock:
+ tipc_node_unlock(n_ptr);
+ tipc_node_put(n_ptr);
+discard:
+ if (unlikely(skb))
+ kfree_skb(skb);
+ }
+}
+
+/* tipc_data_input - deliver data and name distr msgs to upper layer
+ *
+ * Consumes buffer if message is of right type
+ * Node lock must be held
+ */
+static bool tipc_data_input(struct tipc_link *link, struct sk_buff *skb)
+{
+ struct tipc_node *node = link->owner;
+ struct tipc_msg *msg = buf_msg(skb);
+ u32 dport = msg_destport(msg);
+
+ switch (msg_user(msg)) {
+ case TIPC_LOW_IMPORTANCE:
+ case TIPC_MEDIUM_IMPORTANCE:
+ case TIPC_HIGH_IMPORTANCE:
+ case TIPC_CRITICAL_IMPORTANCE:
+ case CONN_MANAGER:
+ if (tipc_skb_queue_tail(&link->inputq, skb, dport)) {
+ node->inputq = &link->inputq;
+ node->action_flags |= TIPC_MSG_EVT;
+ }
+ return true;
+ case NAME_DISTRIBUTOR:
+ node->bclink.recv_permitted = true;
+ node->namedq = &link->namedq;
+ skb_queue_tail(&link->namedq, skb);
+ if (skb_queue_len(&link->namedq) == 1)
+ node->action_flags |= TIPC_NAMED_MSG_EVT;
+ return true;
+ case MSG_BUNDLER:
+ case TUNNEL_PROTOCOL:
+ case MSG_FRAGMENTER:
+ case BCAST_PROTOCOL:
+ return false;
+ default:
+ pr_warn("Dropping received illegal msg type\n");
+ kfree_skb(skb);
+ return false;
+ };
+}
+
+/* tipc_link_input - process packet that has passed link protocol check
+ *
+ * Consumes buffer
+ * Node lock must be held
+ */
+static void tipc_link_input(struct tipc_link *link, struct sk_buff *skb)
+{
+ struct tipc_node *node = link->owner;
+ struct tipc_msg *msg = buf_msg(skb);
+ struct sk_buff *iskb;
+ int pos = 0;
+
+ if (likely(tipc_data_input(link, skb)))
+ return;
+
+ switch (msg_user(msg)) {
+ case TUNNEL_PROTOCOL:
+ if (msg_dup(msg)) {
+ link->flags |= LINK_SYNCHING;
+ link->synch_point = msg_seqno(msg_get_wrapped(msg));
+ kfree_skb(skb);
+ break;
+ }
+ if (!tipc_link_failover_rcv(link, &skb))
+ break;
+ if (msg_user(buf_msg(skb)) != MSG_BUNDLER) {
+ tipc_data_input(link, skb);
+ break;
+ }
+ case MSG_BUNDLER:
+ link->stats.recv_bundles++;
+ link->stats.recv_bundled += msg_msgcnt(msg);
+
+ while (tipc_msg_extract(skb, &iskb, &pos))
+ tipc_data_input(link, iskb);
+ break;
+ case MSG_FRAGMENTER:
+ link->stats.recv_fragments++;
+ if (tipc_buf_append(&link->reasm_buf, &skb)) {
+ link->stats.recv_fragmented++;
+ tipc_data_input(link, skb);
+ } else if (!link->reasm_buf) {
+ tipc_link_reset(link);
+ }
+ break;
+ case BCAST_PROTOCOL:
+ tipc_link_sync_rcv(node, skb);
+ break;
+ default:
+ break;
+ };
+}
+
+/**
+ * tipc_link_defer_pkt - Add out-of-sequence message to deferred reception queue
+ *
+ * Returns increase in queue length (i.e. 0 or 1)
+ */
+u32 tipc_link_defer_pkt(struct sk_buff_head *list, struct sk_buff *skb)
+{
+ struct sk_buff *skb1;
+ u32 seq_no = buf_seqno(skb);
+
+ /* Empty queue ? */
+ if (skb_queue_empty(list)) {
+ __skb_queue_tail(list, skb);
+ return 1;
+ }
+
+ /* Last ? */
+ if (less(buf_seqno(skb_peek_tail(list)), seq_no)) {
+ __skb_queue_tail(list, skb);
+ return 1;
+ }
+
+ /* Locate insertion point in queue, then insert; discard if duplicate */
+ skb_queue_walk(list, skb1) {
+ u32 curr_seqno = buf_seqno(skb1);
+
+ if (seq_no == curr_seqno) {
+ kfree_skb(skb);
+ return 0;
+ }
+
+ if (less(seq_no, curr_seqno))
+ break;
+ }
+
+ __skb_queue_before(list, skb1, skb);
+ return 1;
+}
+
+/*
+ * link_handle_out_of_seq_msg - handle arrival of out-of-sequence packet
+ */
+static void link_handle_out_of_seq_msg(struct tipc_link *l_ptr,
+ struct sk_buff *buf)
+{
+ u32 seq_no = buf_seqno(buf);
+
+ if (likely(msg_user(buf_msg(buf)) == LINK_PROTOCOL)) {
+ tipc_link_proto_rcv(l_ptr, buf);
+ return;
+ }
+
+ /* Record OOS packet arrival (force mismatch on next timeout) */
+ l_ptr->checkpoint--;
+
+ /*
+ * Discard packet if a duplicate; otherwise add it to deferred queue
+ * and notify peer of gap as per protocol specification
+ */
+ if (less(seq_no, mod(l_ptr->next_in_no))) {
+ l_ptr->stats.duplicates++;
+ kfree_skb(buf);
+ return;
+ }
+
+ if (tipc_link_defer_pkt(&l_ptr->deferdq, buf)) {
+ l_ptr->stats.deferred_recv++;
+ if ((skb_queue_len(&l_ptr->deferdq) % TIPC_MIN_LINK_WIN) == 1)
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0, 0, 0, 0);
+ } else {
+ l_ptr->stats.duplicates++;
+ }
+}
+
+/*
+ * Send protocol message to the other endpoint.
+ */
+void tipc_link_proto_xmit(struct tipc_link *l_ptr, u32 msg_typ, int probe_msg,
+ u32 gap, u32 tolerance, u32 priority)
+{
+ struct sk_buff *buf = NULL;
+ struct tipc_msg *msg = l_ptr->pmsg;
+ u32 msg_size = sizeof(l_ptr->proto_msg);
+ int r_flag;
+
+ /* Don't send protocol message during link failover */
+ if (l_ptr->flags & LINK_FAILINGOVER)
+ return;
+
+ /* Abort non-RESET send if communication with node is prohibited */
+ if ((tipc_node_blocked(l_ptr->owner)) && (msg_typ != RESET_MSG))
+ return;
+
+ /* Create protocol message with "out-of-sequence" sequence number */
+ msg_set_type(msg, msg_typ);
+ msg_set_net_plane(msg, l_ptr->net_plane);
+ msg_set_bcast_ack(msg, l_ptr->owner->bclink.last_in);
+ msg_set_last_bcast(msg, tipc_bclink_get_last_sent(l_ptr->owner->net));
+
+ if (msg_typ == STATE_MSG) {
+ u32 next_sent = mod(l_ptr->next_out_no);
+
+ if (!tipc_link_is_up(l_ptr))
+ return;
+ if (skb_queue_len(&l_ptr->backlogq))
+ next_sent = buf_seqno(skb_peek(&l_ptr->backlogq));
+ msg_set_next_sent(msg, next_sent);
+ if (!skb_queue_empty(&l_ptr->deferdq)) {
+ u32 rec = buf_seqno(skb_peek(&l_ptr->deferdq));
+ gap = mod(rec - mod(l_ptr->next_in_no));
+ }
+ msg_set_seq_gap(msg, gap);
+ if (gap)
+ l_ptr->stats.sent_nacks++;
+ msg_set_link_tolerance(msg, tolerance);
+ msg_set_linkprio(msg, priority);
+ msg_set_max_pkt(msg, l_ptr->mtu);
+ msg_set_ack(msg, mod(l_ptr->next_in_no - 1));
+ msg_set_probe(msg, probe_msg != 0);
+ if (probe_msg)
+ l_ptr->stats.sent_probes++;
+ l_ptr->stats.sent_states++;
+ } else { /* RESET_MSG or ACTIVATE_MSG */
+ msg_set_ack(msg, mod(l_ptr->failover_checkpt - 1));
+ msg_set_seq_gap(msg, 0);
+ msg_set_next_sent(msg, 1);
+ msg_set_probe(msg, 0);
+ msg_set_link_tolerance(msg, l_ptr->tolerance);
+ msg_set_linkprio(msg, l_ptr->priority);
+ msg_set_max_pkt(msg, l_ptr->advertised_mtu);
+ }
+
+ r_flag = (l_ptr->owner->working_links > tipc_link_is_up(l_ptr));
+ msg_set_redundant_link(msg, r_flag);
+ msg_set_linkprio(msg, l_ptr->priority);
+ msg_set_size(msg, msg_size);
+
+ msg_set_seqno(msg, mod(l_ptr->next_out_no + (0xffff/2)));
+
+ buf = tipc_buf_acquire(msg_size);
+ if (!buf)
+ return;
+
+ skb_copy_to_linear_data(buf, msg, sizeof(l_ptr->proto_msg));
+ buf->priority = TC_PRIO_CONTROL;
+ tipc_bearer_send(l_ptr->owner->net, l_ptr->bearer_id, buf,
+ &l_ptr->media_addr);
+ l_ptr->rcv_unacked = 0;
+ kfree_skb(buf);
+}
+
+/*
+ * Receive protocol message :
+ * Note that network plane id propagates through the network, and may
+ * change at any time. The node with lowest address rules
+ */
+static void tipc_link_proto_rcv(struct tipc_link *l_ptr,
+ struct sk_buff *buf)
+{
+ u32 rec_gap = 0;
+ u32 msg_tol;
+ struct tipc_msg *msg = buf_msg(buf);
+
+ if (l_ptr->flags & LINK_FAILINGOVER)
+ goto exit;
+
+ if (l_ptr->net_plane != msg_net_plane(msg))
+ if (link_own_addr(l_ptr) > msg_prevnode(msg))
+ l_ptr->net_plane = msg_net_plane(msg);
+
+ switch (msg_type(msg)) {
+
+ case RESET_MSG:
+ if (!link_working_unknown(l_ptr) &&
+ (l_ptr->peer_session != INVALID_SESSION)) {
+ if (less_eq(msg_session(msg), l_ptr->peer_session))
+ break; /* duplicate or old reset: ignore */
+ }
+
+ if (!msg_redundant_link(msg) && (link_working_working(l_ptr) ||
+ link_working_unknown(l_ptr))) {
+ /*
+ * peer has lost contact -- don't allow peer's links
+ * to reactivate before we recognize loss & clean up
+ */
+ l_ptr->owner->action_flags |= TIPC_WAIT_OWN_LINKS_DOWN;
+ }
+
+ link_state_event(l_ptr, RESET_MSG);
+
+ /* fall thru' */
+ case ACTIVATE_MSG:
+ /* Update link settings according other endpoint's values */
+ strcpy((strrchr(l_ptr->name, ':') + 1), (char *)msg_data(msg));
+
+ msg_tol = msg_link_tolerance(msg);
+ if (msg_tol > l_ptr->tolerance)
+ link_set_supervision_props(l_ptr, msg_tol);
+
+ if (msg_linkprio(msg) > l_ptr->priority)
+ l_ptr->priority = msg_linkprio(msg);
+
+ if (l_ptr->mtu > msg_max_pkt(msg))
+ l_ptr->mtu = msg_max_pkt(msg);
+
+ /* Synchronize broadcast link info, if not done previously */
+ if (!tipc_node_is_up(l_ptr->owner)) {
+ l_ptr->owner->bclink.last_sent =
+ l_ptr->owner->bclink.last_in =
+ msg_last_bcast(msg);
+ l_ptr->owner->bclink.oos_state = 0;
+ }
+
+ l_ptr->peer_session = msg_session(msg);
+ l_ptr->peer_bearer_id = msg_bearer_id(msg);
+
+ if (msg_type(msg) == ACTIVATE_MSG)
+ link_state_event(l_ptr, ACTIVATE_MSG);
+ break;
+ case STATE_MSG:
+
+ msg_tol = msg_link_tolerance(msg);
+ if (msg_tol)
+ link_set_supervision_props(l_ptr, msg_tol);
+
+ if (msg_linkprio(msg) &&
+ (msg_linkprio(msg) != l_ptr->priority)) {
+ pr_debug("%s<%s>, priority change %u->%u\n",
+ link_rst_msg, l_ptr->name,
+ l_ptr->priority, msg_linkprio(msg));
+ l_ptr->priority = msg_linkprio(msg);
+ tipc_link_reset(l_ptr); /* Enforce change to take effect */
+ break;
+ }
+
+ /* Record reception; force mismatch at next timeout: */
+ l_ptr->checkpoint--;
+
+ link_state_event(l_ptr, TRAFFIC_MSG_EVT);
+ l_ptr->stats.recv_states++;
+ if (link_reset_unknown(l_ptr))
+ break;
+
+ if (less_eq(mod(l_ptr->next_in_no), msg_next_sent(msg))) {
+ rec_gap = mod(msg_next_sent(msg) -
+ mod(l_ptr->next_in_no));
+ }
+
+ if (msg_probe(msg))
+ l_ptr->stats.recv_probes++;
+
+ /* Protocol message before retransmits, reduce loss risk */
+ if (l_ptr->owner->bclink.recv_permitted)
+ tipc_bclink_update_link_state(l_ptr->owner,
+ msg_last_bcast(msg));
+
+ if (rec_gap || (msg_probe(msg))) {
+ tipc_link_proto_xmit(l_ptr, STATE_MSG, 0,
+ rec_gap, 0, 0);
+ }
+ if (msg_seq_gap(msg)) {
+ l_ptr->stats.recv_nacks++;
+ tipc_link_retransmit(l_ptr, skb_peek(&l_ptr->transmq),
+ msg_seq_gap(msg));
+ }
+ break;
+ }
+exit:
+ kfree_skb(buf);
+}
+
+
+/* tipc_link_tunnel_xmit(): Tunnel one packet via a link belonging to
+ * a different bearer. Owner node is locked.
+ */
+static void tipc_link_tunnel_xmit(struct tipc_link *l_ptr,
+ struct tipc_msg *tunnel_hdr,
+ struct tipc_msg *msg,
+ u32 selector)
+{
+ struct tipc_link *tunnel;
+ struct sk_buff *skb;
+ u32 length = msg_size(msg);
+
+ tunnel = l_ptr->owner->active_links[selector & 1];
+ if (!tipc_link_is_up(tunnel)) {
+ pr_warn("%stunnel link no longer available\n", link_co_err);
+ return;
+ }
+ msg_set_size(tunnel_hdr, length + INT_H_SIZE);
+ skb = tipc_buf_acquire(length + INT_H_SIZE);
+ if (!skb) {
+ pr_warn("%sunable to send tunnel msg\n", link_co_err);
+ return;
+ }
+ skb_copy_to_linear_data(skb, tunnel_hdr, INT_H_SIZE);
+ skb_copy_to_linear_data_offset(skb, INT_H_SIZE, msg, length);
+ __tipc_link_xmit_skb(tunnel, skb);
+}
+
+
+/* tipc_link_failover_send_queue(): A link has gone down, but a second
+ * link is still active. We can do failover. Tunnel the failing link's
+ * whole send queue via the remaining link. This way, we don't lose
+ * any packets, and sequence order is preserved for subsequent traffic
+ * sent over the remaining link. Owner node is locked.
+ */
+void tipc_link_failover_send_queue(struct tipc_link *l_ptr)
+{
+ int msgcount;
+ struct tipc_link *tunnel = l_ptr->owner->active_links[0];
+ struct tipc_msg tunnel_hdr;
+ struct sk_buff *skb;
+ int split_bundles;
+
+ if (!tunnel)
+ return;
+
+ tipc_msg_init(link_own_addr(l_ptr), &tunnel_hdr, TUNNEL_PROTOCOL,
+ FAILOVER_MSG, INT_H_SIZE, l_ptr->addr);
+ skb_queue_splice_tail_init(&l_ptr->backlogq, &l_ptr->transmq);
+ tipc_link_purge_backlog(l_ptr);
+ msgcount = skb_queue_len(&l_ptr->transmq);
+ msg_set_bearer_id(&tunnel_hdr, l_ptr->peer_bearer_id);
+ msg_set_msgcnt(&tunnel_hdr, msgcount);
+
+ if (skb_queue_empty(&l_ptr->transmq)) {
+ skb = tipc_buf_acquire(INT_H_SIZE);
+ if (skb) {
+ skb_copy_to_linear_data(skb, &tunnel_hdr, INT_H_SIZE);
+ msg_set_size(&tunnel_hdr, INT_H_SIZE);
+ __tipc_link_xmit_skb(tunnel, skb);
+ } else {
+ pr_warn("%sunable to send changeover msg\n",
+ link_co_err);
+ }
+ return;
+ }
+
+ split_bundles = (l_ptr->owner->active_links[0] !=
+ l_ptr->owner->active_links[1]);
+
+ skb_queue_walk(&l_ptr->transmq, skb) {
+ struct tipc_msg *msg = buf_msg(skb);
+
+ if ((msg_user(msg) == MSG_BUNDLER) && split_bundles) {
+ struct tipc_msg *m = msg_get_wrapped(msg);
+ unchar *pos = (unchar *)m;
+
+ msgcount = msg_msgcnt(msg);
+ while (msgcount--) {
+ msg_set_seqno(m, msg_seqno(msg));
+ tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, m,
+ msg_link_selector(m));
+ pos += align(msg_size(m));
+ m = (struct tipc_msg *)pos;
+ }
+ } else {
+ tipc_link_tunnel_xmit(l_ptr, &tunnel_hdr, msg,
+ msg_link_selector(msg));
+ }
+ }
+}
+
+/* tipc_link_dup_queue_xmit(): A second link has become active. Tunnel a
+ * duplicate of the first link's send queue via the new link. This way, we
+ * are guaranteed that currently queued packets from a socket are delivered
+ * before future traffic from the same socket, even if this is using the
+ * new link. The last arriving copy of each duplicate packet is dropped at
+ * the receiving end by the regular protocol check, so packet cardinality
+ * and sequence order is preserved per sender/receiver socket pair.
+ * Owner node is locked.
+ */
+void tipc_link_dup_queue_xmit(struct tipc_link *link,
+ struct tipc_link *tnl)
+{
+ struct sk_buff *skb;
+ struct tipc_msg tnl_hdr;
+ struct sk_buff_head *queue = &link->transmq;
+ int mcnt;
+
+ tipc_msg_init(link_own_addr(link), &tnl_hdr, TUNNEL_PROTOCOL,
+ SYNCH_MSG, INT_H_SIZE, link->addr);
+ mcnt = skb_queue_len(&link->transmq) + skb_queue_len(&link->backlogq);
+ msg_set_msgcnt(&tnl_hdr, mcnt);
+ msg_set_bearer_id(&tnl_hdr, link->peer_bearer_id);
+
+tunnel_queue:
+ skb_queue_walk(queue, skb) {
+ struct sk_buff *outskb;
+ struct tipc_msg *msg = buf_msg(skb);
+ u32 len = msg_size(msg);
+
+ msg_set_ack(msg, mod(link->next_in_no - 1));
+ msg_set_bcast_ack(msg, link->owner->bclink.last_in);
+ msg_set_size(&tnl_hdr, len + INT_H_SIZE);
+ outskb = tipc_buf_acquire(len + INT_H_SIZE);
+ if (outskb == NULL) {
+ pr_warn("%sunable to send duplicate msg\n",
+ link_co_err);
+ return;
+ }
+ skb_copy_to_linear_data(outskb, &tnl_hdr, INT_H_SIZE);
+ skb_copy_to_linear_data_offset(outskb, INT_H_SIZE,
+ skb->data, len);
+ __tipc_link_xmit_skb(tnl, outskb);
+ if (!tipc_link_is_up(link))
+ return;
+ }
+ if (queue == &link->backlogq)
+ return;
+ queue = &link->backlogq;
+ goto tunnel_queue;
+}
+
+/* tipc_link_failover_rcv(): Receive a tunnelled FAILOVER_MSG packet
+ * Owner node is locked.
+ */
+static bool tipc_link_failover_rcv(struct tipc_link *link,
+ struct sk_buff **skb)
+{
+ struct tipc_msg *msg = buf_msg(*skb);
+ struct sk_buff *iskb = NULL;
+ struct tipc_link *pl = NULL;
+ int bearer_id = msg_bearer_id(msg);
+ int pos = 0;
+
+ if (msg_type(msg) != FAILOVER_MSG) {
+ pr_warn("%sunknown tunnel pkt received\n", link_co_err);
+ goto exit;
+ }
+ if (bearer_id >= MAX_BEARERS)
+ goto exit;
+
+ if (bearer_id == link->bearer_id)
+ goto exit;
+
+ pl = link->owner->links[bearer_id];
+ if (pl && tipc_link_is_up(pl))
+ tipc_link_reset(pl);
+
+ if (link->failover_pkts == FIRST_FAILOVER)
+ link->failover_pkts = msg_msgcnt(msg);
+
+ /* Should we expect an inner packet? */
+ if (!link->failover_pkts)
+ goto exit;
+
+ if (!tipc_msg_extract(*skb, &iskb, &pos)) {
+ pr_warn("%sno inner failover pkt\n", link_co_err);
+ *skb = NULL;
+ goto exit;
+ }
+ link->failover_pkts--;
+ *skb = NULL;
+
+ /* Was this packet already delivered? */
+ if (less(buf_seqno(iskb), link->failover_checkpt)) {
+ kfree_skb(iskb);
+ iskb = NULL;
+ goto exit;
+ }
+ if (msg_user(buf_msg(iskb)) == MSG_FRAGMENTER) {
+ link->stats.recv_fragments++;
+ tipc_buf_append(&link->failover_skb, &iskb);
+ }
+exit:
+ if (!link->failover_pkts && pl)
+ pl->flags &= ~LINK_FAILINGOVER;
+ kfree_skb(*skb);
+ *skb = iskb;
+ return *skb;
+}
+
+static void link_set_supervision_props(struct tipc_link *l_ptr, u32 tol)
+{
+ unsigned long intv = ((tol / 4) > 500) ? 500 : tol / 4;
+
+ if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
+ return;
+
+ l_ptr->tolerance = tol;
+ l_ptr->cont_intv = msecs_to_jiffies(intv);
+ l_ptr->abort_limit = tol / (jiffies_to_msecs(l_ptr->cont_intv) / 4);
+}
+
+void tipc_link_set_queue_limits(struct tipc_link *l, u32 win)
+{
+ int max_bulk = TIPC_MAX_PUBLICATIONS / (l->mtu / ITEM_SIZE);
+
+ l->window = win;
+ l->backlog[TIPC_LOW_IMPORTANCE].limit = win / 2;
+ l->backlog[TIPC_MEDIUM_IMPORTANCE].limit = win;
+ l->backlog[TIPC_HIGH_IMPORTANCE].limit = win / 2 * 3;
+ l->backlog[TIPC_CRITICAL_IMPORTANCE].limit = win * 2;
+ l->backlog[TIPC_SYSTEM_IMPORTANCE].limit = max_bulk;
+}
+
+/* tipc_link_find_owner - locate owner node of link by link's name
+ * @net: the applicable net namespace
+ * @name: pointer to link name string
+ * @bearer_id: pointer to index in 'node->links' array where the link was found.
+ *
+ * Returns pointer to node owning the link, or 0 if no matching link is found.
+ */
+static struct tipc_node *tipc_link_find_owner(struct net *net,
+ const char *link_name,
+ unsigned int *bearer_id)
+{
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_link *l_ptr;
+ struct tipc_node *n_ptr;
+ struct tipc_node *found_node = NULL;
+ int i;
+
+ *bearer_id = 0;
+ rcu_read_lock();
+ list_for_each_entry_rcu(n_ptr, &tn->node_list, list) {
+ tipc_node_lock(n_ptr);
+ for (i = 0; i < MAX_BEARERS; i++) {
+ l_ptr = n_ptr->links[i];
+ if (l_ptr && !strcmp(l_ptr->name, link_name)) {
+ *bearer_id = i;
+ found_node = n_ptr;
+ break;
+ }
+ }
+ tipc_node_unlock(n_ptr);
+ if (found_node)
+ break;
+ }
+ rcu_read_unlock();
+
+ return found_node;
+}
+
+/**
+ * link_reset_statistics - reset link statistics
+ * @l_ptr: pointer to link
+ */
+static void link_reset_statistics(struct tipc_link *l_ptr)
+{
+ memset(&l_ptr->stats, 0, sizeof(l_ptr->stats));
+ l_ptr->stats.sent_info = l_ptr->next_out_no;
+ l_ptr->stats.recv_info = l_ptr->next_in_no;
+}
+
+static void link_print(struct tipc_link *l_ptr, const char *str)
+{
+ struct tipc_net *tn = net_generic(l_ptr->owner->net, tipc_net_id);
+ struct tipc_bearer *b_ptr;
+
+ rcu_read_lock();
+ b_ptr = rcu_dereference_rtnl(tn->bearer_list[l_ptr->bearer_id]);
+ if (b_ptr)
+ pr_info("%s Link %x<%s>:", str, l_ptr->addr, b_ptr->name);
+ rcu_read_unlock();
+
+ if (link_working_unknown(l_ptr))
+ pr_cont(":WU\n");
+ else if (link_reset_reset(l_ptr))
+ pr_cont(":RR\n");
+ else if (link_reset_unknown(l_ptr))
+ pr_cont(":RU\n");
+ else if (link_working_working(l_ptr))
+ pr_cont(":WW\n");
+ else
+ pr_cont("\n");
+}
+
+/* Parse and validate nested (link) properties valid for media, bearer and link
+ */
+int tipc_nl_parse_link_prop(struct nlattr *prop, struct nlattr *props[])
+{
+ int err;
+
+ err = nla_parse_nested(props, TIPC_NLA_PROP_MAX, prop,
+ tipc_nl_prop_policy);
+ if (err)
+ return err;
+
+ if (props[TIPC_NLA_PROP_PRIO]) {
+ u32 prio;
+
+ prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
+ if (prio > TIPC_MAX_LINK_PRI)
+ return -EINVAL;
+ }
+
+ if (props[TIPC_NLA_PROP_TOL]) {
+ u32 tol;
+
+ tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
+ if ((tol < TIPC_MIN_LINK_TOL) || (tol > TIPC_MAX_LINK_TOL))
+ return -EINVAL;
+ }
+
+ if (props[TIPC_NLA_PROP_WIN]) {
+ u32 win;
+
+ win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
+ if ((win < TIPC_MIN_LINK_WIN) || (win > TIPC_MAX_LINK_WIN))
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
+int tipc_nl_link_set(struct sk_buff *skb, struct genl_info *info)
+{
+ int err;
+ int res = 0;
+ int bearer_id;
+ char *name;
+ struct tipc_link *link;
+ struct tipc_node *node;
+ struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
+ struct net *net = sock_net(skb->sk);
+
+ if (!info->attrs[TIPC_NLA_LINK])
+ return -EINVAL;
+
+ err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
+ info->attrs[TIPC_NLA_LINK],
+ tipc_nl_link_policy);
+ if (err)
+ return err;
+
+ if (!attrs[TIPC_NLA_LINK_NAME])
+ return -EINVAL;
+
+ name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+
+ node = tipc_link_find_owner(net, name, &bearer_id);
+ if (!node)
+ return -EINVAL;
+
+ tipc_node_lock(node);
+
+ link = node->links[bearer_id];
+ if (!link) {
+ res = -EINVAL;
+ goto out;
+ }
+
+ if (attrs[TIPC_NLA_LINK_PROP]) {
+ struct nlattr *props[TIPC_NLA_PROP_MAX + 1];
+
+ err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP],
+ props);
+ if (err) {
+ res = err;
+ goto out;
+ }
+
+ if (props[TIPC_NLA_PROP_TOL]) {
+ u32 tol;
+
+ tol = nla_get_u32(props[TIPC_NLA_PROP_TOL]);
+ link_set_supervision_props(link, tol);
+ tipc_link_proto_xmit(link, STATE_MSG, 0, 0, tol, 0);
+ }
+ if (props[TIPC_NLA_PROP_PRIO]) {
+ u32 prio;
+
+ prio = nla_get_u32(props[TIPC_NLA_PROP_PRIO]);
+ link->priority = prio;
+ tipc_link_proto_xmit(link, STATE_MSG, 0, 0, 0, prio);
+ }
+ if (props[TIPC_NLA_PROP_WIN]) {
+ u32 win;
+
+ win = nla_get_u32(props[TIPC_NLA_PROP_WIN]);
+ tipc_link_set_queue_limits(link, win);
+ }
+ }
+
+out:
+ tipc_node_unlock(node);
+
+ return res;
+}
+
+static int __tipc_nl_add_stats(struct sk_buff *skb, struct tipc_stats *s)
+{
+ int i;
+ struct nlattr *stats;
+
+ struct nla_map {
+ u32 key;
+ u32 val;
+ };
+
+ struct nla_map map[] = {
+ {TIPC_NLA_STATS_RX_INFO, s->recv_info},
+ {TIPC_NLA_STATS_RX_FRAGMENTS, s->recv_fragments},
+ {TIPC_NLA_STATS_RX_FRAGMENTED, s->recv_fragmented},
+ {TIPC_NLA_STATS_RX_BUNDLES, s->recv_bundles},
+ {TIPC_NLA_STATS_RX_BUNDLED, s->recv_bundled},
+ {TIPC_NLA_STATS_TX_INFO, s->sent_info},
+ {TIPC_NLA_STATS_TX_FRAGMENTS, s->sent_fragments},
+ {TIPC_NLA_STATS_TX_FRAGMENTED, s->sent_fragmented},
+ {TIPC_NLA_STATS_TX_BUNDLES, s->sent_bundles},
+ {TIPC_NLA_STATS_TX_BUNDLED, s->sent_bundled},
+ {TIPC_NLA_STATS_MSG_PROF_TOT, (s->msg_length_counts) ?
+ s->msg_length_counts : 1},
+ {TIPC_NLA_STATS_MSG_LEN_CNT, s->msg_length_counts},
+ {TIPC_NLA_STATS_MSG_LEN_TOT, s->msg_lengths_total},
+ {TIPC_NLA_STATS_MSG_LEN_P0, s->msg_length_profile[0]},
+ {TIPC_NLA_STATS_MSG_LEN_P1, s->msg_length_profile[1]},
+ {TIPC_NLA_STATS_MSG_LEN_P2, s->msg_length_profile[2]},
+ {TIPC_NLA_STATS_MSG_LEN_P3, s->msg_length_profile[3]},
+ {TIPC_NLA_STATS_MSG_LEN_P4, s->msg_length_profile[4]},
+ {TIPC_NLA_STATS_MSG_LEN_P5, s->msg_length_profile[5]},
+ {TIPC_NLA_STATS_MSG_LEN_P6, s->msg_length_profile[6]},
+ {TIPC_NLA_STATS_RX_STATES, s->recv_states},
+ {TIPC_NLA_STATS_RX_PROBES, s->recv_probes},
+ {TIPC_NLA_STATS_RX_NACKS, s->recv_nacks},
+ {TIPC_NLA_STATS_RX_DEFERRED, s->deferred_recv},
+ {TIPC_NLA_STATS_TX_STATES, s->sent_states},
+ {TIPC_NLA_STATS_TX_PROBES, s->sent_probes},
+ {TIPC_NLA_STATS_TX_NACKS, s->sent_nacks},
+ {TIPC_NLA_STATS_TX_ACKS, s->sent_acks},
+ {TIPC_NLA_STATS_RETRANSMITTED, s->retransmitted},
+ {TIPC_NLA_STATS_DUPLICATES, s->duplicates},
+ {TIPC_NLA_STATS_LINK_CONGS, s->link_congs},
+ {TIPC_NLA_STATS_MAX_QUEUE, s->max_queue_sz},
+ {TIPC_NLA_STATS_AVG_QUEUE, s->queue_sz_counts ?
+ (s->accu_queue_sz / s->queue_sz_counts) : 0}
+ };
+
+ stats = nla_nest_start(skb, TIPC_NLA_LINK_STATS);
+ if (!stats)
+ return -EMSGSIZE;
+
+ for (i = 0; i < ARRAY_SIZE(map); i++)
+ if (nla_put_u32(skb, map[i].key, map[i].val))
+ goto msg_full;
+
+ nla_nest_end(skb, stats);
+
+ return 0;
+msg_full:
+ nla_nest_cancel(skb, stats);
+
+ return -EMSGSIZE;
+}
+
+/* Caller should hold appropriate locks to protect the link */
+static int __tipc_nl_add_link(struct net *net, struct tipc_nl_msg *msg,
+ struct tipc_link *link, int nlflags)
+{
+ int err;
+ void *hdr;
+ struct nlattr *attrs;
+ struct nlattr *prop;
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+
+ hdr = genlmsg_put(msg->skb, msg->portid, msg->seq, &tipc_genl_family,
+ nlflags, TIPC_NL_LINK_GET);
+ if (!hdr)
+ return -EMSGSIZE;
+
+ attrs = nla_nest_start(msg->skb, TIPC_NLA_LINK);
+ if (!attrs)
+ goto msg_full;
+
+ if (nla_put_string(msg->skb, TIPC_NLA_LINK_NAME, link->name))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_DEST,
+ tipc_cluster_mask(tn->own_addr)))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_MTU, link->mtu))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_RX, link->next_in_no))
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->next_out_no))
+ goto attr_msg_full;
+
+ if (tipc_link_is_up(link))
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_UP))
+ goto attr_msg_full;
+ if (tipc_link_is_active(link))
+ if (nla_put_flag(msg->skb, TIPC_NLA_LINK_ACTIVE))
+ goto attr_msg_full;
+
+ prop = nla_nest_start(msg->skb, TIPC_NLA_LINK_PROP);
+ if (!prop)
+ goto attr_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_TOL, link->tolerance))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_WIN,
+ link->window))
+ goto prop_msg_full;
+ if (nla_put_u32(msg->skb, TIPC_NLA_PROP_PRIO, link->priority))
+ goto prop_msg_full;
+ nla_nest_end(msg->skb, prop);
+
+ err = __tipc_nl_add_stats(msg->skb, &link->stats);
+ if (err)
+ goto attr_msg_full;
+
+ nla_nest_end(msg->skb, attrs);
+ genlmsg_end(msg->skb, hdr);
+
+ return 0;
+
+prop_msg_full:
+ nla_nest_cancel(msg->skb, prop);
+attr_msg_full:
+ nla_nest_cancel(msg->skb, attrs);
+msg_full:
+ genlmsg_cancel(msg->skb, hdr);
+
+ return -EMSGSIZE;
+}
+
+/* Caller should hold node lock */
+static int __tipc_nl_add_node_links(struct net *net, struct tipc_nl_msg *msg,
+ struct tipc_node *node, u32 *prev_link)
+{
+ u32 i;
+ int err;
+
+ for (i = *prev_link; i < MAX_BEARERS; i++) {
+ *prev_link = i;
+
+ if (!node->links[i])
+ continue;
+
+ err = __tipc_nl_add_link(net, msg, node->links[i], NLM_F_MULTI);
+ if (err)
+ return err;
+ }
+ *prev_link = 0;
+
+ return 0;
+}
+
+int tipc_nl_link_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ struct net *net = sock_net(skb->sk);
+ struct tipc_net *tn = net_generic(net, tipc_net_id);
+ struct tipc_node *node;
+ struct tipc_nl_msg msg;
+ u32 prev_node = cb->args[0];
+ u32 prev_link = cb->args[1];
+ int done = cb->args[2];
+ int err;
+
+ if (done)
+ return 0;
+
+ msg.skb = skb;
+ msg.portid = NETLINK_CB(cb->skb).portid;
+ msg.seq = cb->nlh->nlmsg_seq;
+
+ rcu_read_lock();
+ if (prev_node) {
+ node = tipc_node_find(net, prev_node);
+ if (!node) {
+ /* We never set seq or call nl_dump_check_consistent()
+ * this means that setting prev_seq here will cause the
+ * consistence check to fail in the netlink callback
+ * handler. Resulting in the last NLMSG_DONE message
+ * having the NLM_F_DUMP_INTR flag set.
+ */
+ cb->prev_seq = 1;
+ goto out;
+ }
+ tipc_node_put(node);
+
+ list_for_each_entry_continue_rcu(node, &tn->node_list,
+ list) {
+ tipc_node_lock(node);
+ err = __tipc_nl_add_node_links(net, &msg, node,
+ &prev_link);
+ tipc_node_unlock(node);
+ if (err)
+ goto out;
+
+ prev_node = node->addr;
+ }
+ } else {
+ err = tipc_nl_add_bc_link(net, &msg);
+ if (err)
+ goto out;
+
+ list_for_each_entry_rcu(node, &tn->node_list, list) {
+ tipc_node_lock(node);
+ err = __tipc_nl_add_node_links(net, &msg, node,
+ &prev_link);
+ tipc_node_unlock(node);
+ if (err)
+ goto out;
+
+ prev_node = node->addr;
+ }
+ }
+ done = 1;
+out:
+ rcu_read_unlock();
+
+ cb->args[0] = prev_node;
+ cb->args[1] = prev_link;
+ cb->args[2] = done;
+
+ return skb->len;
+}
+
+int tipc_nl_link_get(struct sk_buff *skb, struct genl_info *info)
+{
+ struct net *net = genl_info_net(info);
+ struct sk_buff *ans_skb;
+ struct tipc_nl_msg msg;
+ struct tipc_link *link;
+ struct tipc_node *node;
+ char *name;
+ int bearer_id;
+ int err;
+
+ if (!info->attrs[TIPC_NLA_LINK_NAME])
+ return -EINVAL;
+
+ name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
+ node = tipc_link_find_owner(net, name, &bearer_id);
+ if (!node)
+ return -EINVAL;
+
+ ans_skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
+ if (!ans_skb)
+ return -ENOMEM;
+
+ msg.skb = ans_skb;
+ msg.portid = info->snd_portid;
+ msg.seq = info->snd_seq;
+
+ tipc_node_lock(node);
+ link = node->links[bearer_id];
+ if (!link) {
+ err = -EINVAL;
+ goto err_out;
+ }
+
+ err = __tipc_nl_add_link(net, &msg, link, 0);
+ if (err)
+ goto err_out;
+
+ tipc_node_unlock(node);
+
+ return genlmsg_reply(ans_skb, info);
+
+err_out:
+ tipc_node_unlock(node);
+ nlmsg_free(ans_skb);
+
+ return err;
+}
+
+int tipc_nl_link_reset_stats(struct sk_buff *skb, struct genl_info *info)
+{
+ int err;
+ char *link_name;
+ unsigned int bearer_id;
+ struct tipc_link *link;
+ struct tipc_node *node;
+ struct nlattr *attrs[TIPC_NLA_LINK_MAX + 1];
+ struct net *net = sock_net(skb->sk);
+
+ if (!info->attrs[TIPC_NLA_LINK])
+ return -EINVAL;
+
+ err = nla_parse_nested(attrs, TIPC_NLA_LINK_MAX,
+ info->attrs[TIPC_NLA_LINK],
+ tipc_nl_link_policy);
+ if (err)
+ return err;
+
+ if (!attrs[TIPC_NLA_LINK_NAME])
+ return -EINVAL;
+
+ link_name = nla_data(attrs[TIPC_NLA_LINK_NAME]);
+
+ if (strcmp(link_name, tipc_bclink_name) == 0) {
+ err = tipc_bclink_reset_stats(net);
+ if (err)
+ return err;
+ return 0;
+ }
+
+ node = tipc_link_find_owner(net, link_name, &bearer_id);
+ if (!node)
+ return -EINVAL;
+
+ tipc_node_lock(node);
+
+ link = node->links[bearer_id];
+ if (!link) {
+ tipc_node_unlock(node);
+ return -EINVAL;
+ }
+
+ link_reset_statistics(link);
+
+ tipc_node_unlock(node);
+
+ return 0;
+}
Code Review / kvmfornfv.git / blobdiff