1970 lines
51 KiB
C
1970 lines
51 KiB
C
/*
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* net/tipc/link.c: TIPC link code
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*
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* Copyright (c) 1996-2007, 2012-2015, Ericsson AB
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* Copyright (c) 2004-2007, 2010-2013, Wind River Systems
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the names of the copyright holders nor the names of its
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* contributors may be used to endorse or promote products derived from
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* this software without specific prior written permission.
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*
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* Alternatively, this software may be distributed under the terms of the
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* GNU General Public License ("GPL") version 2 as published by the Free
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* Software Foundation.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
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* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
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* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
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* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
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* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
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* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "core.h"
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#include "subscr.h"
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#include "link.h"
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#include "bcast.h"
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#include "socket.h"
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#include "name_distr.h"
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#include "discover.h"
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#include "netlink.h"
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#include <linux/pkt_sched.h>
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/*
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* Error message prefixes
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*/
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static const char *link_co_err = "Link tunneling error, ";
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static const char *link_rst_msg = "Resetting link ";
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static const struct nla_policy tipc_nl_link_policy[TIPC_NLA_LINK_MAX + 1] = {
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[TIPC_NLA_LINK_UNSPEC] = { .type = NLA_UNSPEC },
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[TIPC_NLA_LINK_NAME] = {
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.type = NLA_STRING,
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.len = TIPC_MAX_LINK_NAME
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},
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[TIPC_NLA_LINK_MTU] = { .type = NLA_U32 },
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[TIPC_NLA_LINK_BROADCAST] = { .type = NLA_FLAG },
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[TIPC_NLA_LINK_UP] = { .type = NLA_FLAG },
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[TIPC_NLA_LINK_ACTIVE] = { .type = NLA_FLAG },
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[TIPC_NLA_LINK_PROP] = { .type = NLA_NESTED },
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[TIPC_NLA_LINK_STATS] = { .type = NLA_NESTED },
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[TIPC_NLA_LINK_RX] = { .type = NLA_U32 },
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[TIPC_NLA_LINK_TX] = { .type = NLA_U32 }
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};
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/* Properties valid for media, bearar and link */
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static const struct nla_policy tipc_nl_prop_policy[TIPC_NLA_PROP_MAX + 1] = {
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[TIPC_NLA_PROP_UNSPEC] = { .type = NLA_UNSPEC },
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[TIPC_NLA_PROP_PRIO] = { .type = NLA_U32 },
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[TIPC_NLA_PROP_TOL] = { .type = NLA_U32 },
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[TIPC_NLA_PROP_WIN] = { .type = NLA_U32 }
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};
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/*
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* Interval between NACKs when packets arrive out of order
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*/
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#define TIPC_NACK_INTV (TIPC_MIN_LINK_WIN * 2)
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/*
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* Out-of-range value for link session numbers
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*/
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#define WILDCARD_SESSION 0x10000
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/* Link FSM states:
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*/
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enum {
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LINK_ESTABLISHED = 0xe,
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LINK_ESTABLISHING = 0xe << 4,
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LINK_RESET = 0x1 << 8,
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LINK_RESETTING = 0x2 << 12,
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LINK_PEER_RESET = 0xd << 16,
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LINK_FAILINGOVER = 0xf << 20,
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LINK_SYNCHING = 0xc << 24
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};
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/* Link FSM state checking routines
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*/
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static int link_is_up(struct tipc_link *l)
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{
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return l->state & (LINK_ESTABLISHED | LINK_SYNCHING);
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}
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static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
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struct sk_buff_head *xmitq);
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static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
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u16 rcvgap, int tolerance, int priority,
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struct sk_buff_head *xmitq);
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static void link_reset_statistics(struct tipc_link *l_ptr);
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static void link_print(struct tipc_link *l_ptr, const char *str);
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static void tipc_link_sync_rcv(struct tipc_node *n, struct sk_buff *buf);
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/*
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* Simple non-static link routines (i.e. referenced outside this file)
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*/
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bool tipc_link_is_up(struct tipc_link *l)
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{
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return link_is_up(l);
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}
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bool tipc_link_is_reset(struct tipc_link *l)
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{
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return l->state & (LINK_RESET | LINK_FAILINGOVER | LINK_ESTABLISHING);
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}
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bool tipc_link_is_establishing(struct tipc_link *l)
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{
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return l->state == LINK_ESTABLISHING;
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}
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bool tipc_link_is_synching(struct tipc_link *l)
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{
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return l->state == LINK_SYNCHING;
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}
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bool tipc_link_is_failingover(struct tipc_link *l)
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{
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return l->state == LINK_FAILINGOVER;
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}
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bool tipc_link_is_blocked(struct tipc_link *l)
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{
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return l->state & (LINK_RESETTING | LINK_PEER_RESET | LINK_FAILINGOVER);
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}
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int tipc_link_is_active(struct tipc_link *l)
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{
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struct tipc_node *n = l->owner;
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return (node_active_link(n, 0) == l) || (node_active_link(n, 1) == l);
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}
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static u32 link_own_addr(struct tipc_link *l)
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{
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return msg_prevnode(l->pmsg);
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}
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/**
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* tipc_link_create - create a new link
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* @n: pointer to associated node
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* @b: pointer to associated bearer
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* @ownnode: identity of own node
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* @peer: identity of peer node
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* @maddr: media address to be used
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* @inputq: queue to put messages ready for delivery
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* @namedq: queue to put binding table update messages ready for delivery
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* @link: return value, pointer to put the created link
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*
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* Returns true if link was created, otherwise false
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*/
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bool tipc_link_create(struct tipc_node *n, struct tipc_bearer *b, u32 session,
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u32 ownnode, u32 peer, struct tipc_media_addr *maddr,
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struct sk_buff_head *inputq, struct sk_buff_head *namedq,
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struct tipc_link **link)
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{
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struct tipc_link *l;
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struct tipc_msg *hdr;
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char *if_name;
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l = kzalloc(sizeof(*l), GFP_ATOMIC);
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if (!l)
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return false;
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*link = l;
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/* Note: peer i/f name is completed by reset/activate message */
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if_name = strchr(b->name, ':') + 1;
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sprintf(l->name, "%u.%u.%u:%s-%u.%u.%u:unknown",
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tipc_zone(ownnode), tipc_cluster(ownnode), tipc_node(ownnode),
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if_name, tipc_zone(peer), tipc_cluster(peer), tipc_node(peer));
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l->addr = peer;
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l->media_addr = maddr;
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l->owner = n;
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l->peer_session = WILDCARD_SESSION;
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l->bearer_id = b->identity;
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l->tolerance = b->tolerance;
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l->net_plane = b->net_plane;
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l->advertised_mtu = b->mtu;
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l->mtu = b->mtu;
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l->priority = b->priority;
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tipc_link_set_queue_limits(l, b->window);
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l->inputq = inputq;
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l->namedq = namedq;
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l->state = LINK_RESETTING;
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l->pmsg = (struct tipc_msg *)&l->proto_msg;
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hdr = l->pmsg;
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tipc_msg_init(ownnode, hdr, LINK_PROTOCOL, RESET_MSG, INT_H_SIZE, peer);
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msg_set_size(hdr, sizeof(l->proto_msg));
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msg_set_session(hdr, session);
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msg_set_bearer_id(hdr, l->bearer_id);
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strcpy((char *)msg_data(hdr), if_name);
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__skb_queue_head_init(&l->transmq);
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__skb_queue_head_init(&l->backlogq);
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__skb_queue_head_init(&l->deferdq);
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skb_queue_head_init(&l->wakeupq);
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skb_queue_head_init(l->inputq);
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return true;
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}
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/* tipc_link_build_bcast_sync_msg() - synchronize broadcast link endpoints.
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*
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* Give a newly added peer node the sequence number where it should
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* start receiving and acking broadcast packets.
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*/
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void tipc_link_build_bcast_sync_msg(struct tipc_link *l,
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struct sk_buff_head *xmitq)
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{
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struct sk_buff *skb;
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struct sk_buff_head list;
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u16 last_sent;
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skb = tipc_msg_create(BCAST_PROTOCOL, STATE_MSG, INT_H_SIZE,
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0, l->addr, link_own_addr(l), 0, 0, 0);
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if (!skb)
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return;
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last_sent = tipc_bclink_get_last_sent(l->owner->net);
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msg_set_last_bcast(buf_msg(skb), last_sent);
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__skb_queue_head_init(&list);
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__skb_queue_tail(&list, skb);
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tipc_link_xmit(l, &list, xmitq);
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}
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/**
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* tipc_link_fsm_evt - link finite state machine
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* @l: pointer to link
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* @evt: state machine event to be processed
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*/
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int tipc_link_fsm_evt(struct tipc_link *l, int evt)
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{
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int rc = 0;
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switch (l->state) {
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case LINK_RESETTING:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_FAILURE_EVT:
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILOVER_END_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_RESET:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_ESTABLISHING;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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l->state = LINK_FAILINGOVER;
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case LINK_FAILURE_EVT:
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case LINK_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILOVER_END_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_PEER_RESET:
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switch (evt) {
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case LINK_RESET_EVT:
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l->state = LINK_ESTABLISHING;
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break;
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case LINK_PEER_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILURE_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_FAILINGOVER:
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switch (evt) {
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case LINK_FAILOVER_END_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_PEER_RESET_EVT:
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case LINK_RESET_EVT:
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case LINK_ESTABLISH_EVT:
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case LINK_FAILURE_EVT:
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_SYNCH_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_ESTABLISHING:
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switch (evt) {
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case LINK_ESTABLISH_EVT:
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l->state = LINK_ESTABLISHED;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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l->state = LINK_FAILINGOVER;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_FAILURE_EVT:
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case LINK_PEER_RESET_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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break;
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case LINK_SYNCH_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_ESTABLISHED:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_FAILURE_EVT:
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l->state = LINK_RESETTING;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_ESTABLISH_EVT:
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case LINK_SYNCH_END_EVT:
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break;
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case LINK_SYNCH_BEGIN_EVT:
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l->state = LINK_SYNCHING;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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case LINK_SYNCHING:
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switch (evt) {
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case LINK_PEER_RESET_EVT:
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l->state = LINK_PEER_RESET;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_FAILURE_EVT:
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l->state = LINK_RESETTING;
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rc |= TIPC_LINK_DOWN_EVT;
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break;
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case LINK_RESET_EVT:
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l->state = LINK_RESET;
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break;
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case LINK_ESTABLISH_EVT:
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case LINK_SYNCH_BEGIN_EVT:
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break;
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case LINK_SYNCH_END_EVT:
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l->state = LINK_ESTABLISHED;
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break;
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case LINK_FAILOVER_BEGIN_EVT:
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case LINK_FAILOVER_END_EVT:
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default:
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goto illegal_evt;
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}
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break;
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default:
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pr_err("Unknown FSM state %x in %s\n", l->state, l->name);
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}
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return rc;
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illegal_evt:
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pr_err("Illegal FSM event %x in state %x on link %s\n",
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evt, l->state, l->name);
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return rc;
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}
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/* link_profile_stats - update statistical profiling of traffic
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*/
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static void link_profile_stats(struct tipc_link *l)
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{
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struct sk_buff *skb;
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struct tipc_msg *msg;
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int length;
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/* Update counters used in statistical profiling of send traffic */
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l->stats.accu_queue_sz += skb_queue_len(&l->transmq);
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l->stats.queue_sz_counts++;
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skb = skb_peek(&l->transmq);
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if (!skb)
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return;
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msg = buf_msg(skb);
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length = msg_size(msg);
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if (msg_user(msg) == MSG_FRAGMENTER) {
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if (msg_type(msg) != FIRST_FRAGMENT)
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return;
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length = msg_size(msg_get_wrapped(msg));
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}
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l->stats.msg_lengths_total += length;
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l->stats.msg_length_counts++;
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if (length <= 64)
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l->stats.msg_length_profile[0]++;
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else if (length <= 256)
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l->stats.msg_length_profile[1]++;
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else if (length <= 1024)
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l->stats.msg_length_profile[2]++;
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else if (length <= 4096)
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l->stats.msg_length_profile[3]++;
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else if (length <= 16384)
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l->stats.msg_length_profile[4]++;
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else if (length <= 32768)
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l->stats.msg_length_profile[5]++;
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else
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l->stats.msg_length_profile[6]++;
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}
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/* tipc_link_timeout - perform periodic task as instructed from node timeout
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*/
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int tipc_link_timeout(struct tipc_link *l, struct sk_buff_head *xmitq)
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{
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int rc = 0;
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int mtyp = STATE_MSG;
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bool xmit = false;
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bool prb = false;
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link_profile_stats(l);
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switch (l->state) {
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case LINK_ESTABLISHED:
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case LINK_SYNCHING:
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if (!l->silent_intv_cnt) {
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if (tipc_bclink_acks_missing(l->owner))
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xmit = true;
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} else if (l->silent_intv_cnt <= l->abort_limit) {
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xmit = true;
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prb = true;
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} else {
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rc |= tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
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}
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l->silent_intv_cnt++;
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break;
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case LINK_RESET:
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xmit = true;
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mtyp = RESET_MSG;
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break;
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case LINK_ESTABLISHING:
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xmit = true;
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mtyp = ACTIVATE_MSG;
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break;
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case LINK_PEER_RESET:
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case LINK_RESETTING:
|
|
case LINK_FAILINGOVER:
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
if (xmit)
|
|
tipc_link_build_proto_msg(l, mtyp, prb, 0, 0, 0, xmitq);
|
|
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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
|
|
* Does not consume buffer list
|
|
*/
|
|
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);
|
|
return -ENOBUFS;
|
|
}
|
|
/* 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)
|
|
return -ENOBUFS;
|
|
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;
|
|
}
|
|
|
|
/**
|
|
* 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);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
}
|
|
|
|
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)
|
|
{
|
|
tipc_link_fsm_evt(l, LINK_RESET_EVT);
|
|
|
|
/* Link is down, accept any session */
|
|
l->peer_session = WILDCARD_SESSION;
|
|
|
|
/* If peer is up, it only accepts an incremented session number */
|
|
msg_set_session(l->pmsg, msg_session(l->pmsg) + 1);
|
|
|
|
/* Prepare for renewed mtu size negotiation */
|
|
l->mtu = l->advertised_mtu;
|
|
|
|
/* Clean up all queues: */
|
|
__skb_queue_purge(&l->transmq);
|
|
__skb_queue_purge(&l->deferdq);
|
|
skb_queue_splice_init(&l->wakeupq, l->inputq);
|
|
|
|
tipc_link_purge_backlog(l);
|
|
kfree_skb(l->reasm_buf);
|
|
kfree_skb(l->failover_reasm_skb);
|
|
l->reasm_buf = NULL;
|
|
l->failover_reasm_skb = NULL;
|
|
l->rcv_unacked = 0;
|
|
l->snd_nxt = 1;
|
|
l->rcv_nxt = 1;
|
|
l->silent_intv_cnt = 0;
|
|
l->stats.recv_info = 0;
|
|
l->stale_count = 0;
|
|
link_reset_statistics(l);
|
|
}
|
|
|
|
/**
|
|
* __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 an error code,
|
|
* 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 i, imp = msg_importance(msg);
|
|
uint mtu = link->mtu;
|
|
u16 ack = mod(link->rcv_nxt - 1);
|
|
u16 seqno = link->snd_nxt;
|
|
u16 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, *bskb;
|
|
|
|
/* Match msg importance against this and all higher backlog limits: */
|
|
for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
|
|
if (unlikely(link->backlog[i].len >= link->backlog[i].limit))
|
|
return link_schedule_user(link, list);
|
|
}
|
|
if (unlikely(msg_size(msg) > mtu))
|
|
return -EMSGSIZE;
|
|
|
|
/* Prepare each packet for sending, and add to relevant queue: */
|
|
while (skb_queue_len(list)) {
|
|
skb = skb_peek(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_dequeue(list);
|
|
__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), msg, mtu)) {
|
|
kfree_skb(__skb_dequeue(list));
|
|
link->stats.sent_bundled++;
|
|
continue;
|
|
}
|
|
if (tipc_msg_make_bundle(&bskb, msg, mtu, link->addr)) {
|
|
kfree_skb(__skb_dequeue(list));
|
|
__skb_queue_tail(backlogq, bskb);
|
|
link->backlog[msg_importance(buf_msg(bskb))].len++;
|
|
link->stats.sent_bundled++;
|
|
link->stats.sent_bundles++;
|
|
continue;
|
|
}
|
|
link->backlog[imp].len += skb_queue_len(list);
|
|
skb_queue_splice_tail_init(list, backlogq);
|
|
}
|
|
link->snd_nxt = seqno;
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* tipc_link_xmit(): enqueue buffer list according to queue situation
|
|
* @link: link to use
|
|
* @list: chain of buffers containing message
|
|
* @xmitq: returned list of packets to be sent by caller
|
|
*
|
|
* 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 tipc_link *l, struct sk_buff_head *list,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb_peek(list));
|
|
unsigned int maxwin = l->window;
|
|
unsigned int i, imp = msg_importance(hdr);
|
|
unsigned int mtu = l->mtu;
|
|
u16 ack = l->rcv_nxt - 1;
|
|
u16 seqno = l->snd_nxt;
|
|
u16 bc_last_in = l->owner->bclink.last_in;
|
|
struct sk_buff_head *transmq = &l->transmq;
|
|
struct sk_buff_head *backlogq = &l->backlogq;
|
|
struct sk_buff *skb, *_skb, *bskb;
|
|
|
|
/* Match msg importance against this and all higher backlog limits: */
|
|
for (i = imp; i <= TIPC_SYSTEM_IMPORTANCE; i++) {
|
|
if (unlikely(l->backlog[i].len >= l->backlog[i].limit))
|
|
return link_schedule_user(l, list);
|
|
}
|
|
if (unlikely(msg_size(hdr) > mtu))
|
|
return -EMSGSIZE;
|
|
|
|
/* Prepare each packet for sending, and add to relevant queue: */
|
|
while (skb_queue_len(list)) {
|
|
skb = skb_peek(list);
|
|
hdr = buf_msg(skb);
|
|
msg_set_seqno(hdr, seqno);
|
|
msg_set_ack(hdr, ack);
|
|
msg_set_bcast_ack(hdr, bc_last_in);
|
|
|
|
if (likely(skb_queue_len(transmq) < maxwin)) {
|
|
_skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!_skb)
|
|
return -ENOBUFS;
|
|
__skb_dequeue(list);
|
|
__skb_queue_tail(transmq, skb);
|
|
__skb_queue_tail(xmitq, _skb);
|
|
l->rcv_unacked = 0;
|
|
seqno++;
|
|
continue;
|
|
}
|
|
if (tipc_msg_bundle(skb_peek_tail(backlogq), hdr, mtu)) {
|
|
kfree_skb(__skb_dequeue(list));
|
|
l->stats.sent_bundled++;
|
|
continue;
|
|
}
|
|
if (tipc_msg_make_bundle(&bskb, hdr, mtu, l->addr)) {
|
|
kfree_skb(__skb_dequeue(list));
|
|
__skb_queue_tail(backlogq, bskb);
|
|
l->backlog[msg_importance(buf_msg(bskb))].len++;
|
|
l->stats.sent_bundled++;
|
|
l->stats.sent_bundles++;
|
|
continue;
|
|
}
|
|
l->backlog[imp].len += skb_queue_len(list);
|
|
skb_queue_splice_tail_init(list, backlogq);
|
|
}
|
|
l->snd_nxt = seqno;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
u16 seqno = link->snd_nxt;
|
|
u16 ack = mod(link->rcv_nxt - 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_seqno(msg, seqno);
|
|
seqno = mod(seqno + 1);
|
|
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);
|
|
}
|
|
link->snd_nxt = seqno;
|
|
}
|
|
|
|
void tipc_link_advance_backlog(struct tipc_link *l, struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff *skb, *_skb;
|
|
struct tipc_msg *hdr;
|
|
u16 seqno = l->snd_nxt;
|
|
u16 ack = l->rcv_nxt - 1;
|
|
|
|
while (skb_queue_len(&l->transmq) < l->window) {
|
|
skb = skb_peek(&l->backlogq);
|
|
if (!skb)
|
|
break;
|
|
_skb = skb_clone(skb, GFP_ATOMIC);
|
|
if (!_skb)
|
|
break;
|
|
__skb_dequeue(&l->backlogq);
|
|
hdr = buf_msg(skb);
|
|
l->backlog[msg_importance(hdr)].len--;
|
|
__skb_queue_tail(&l->transmq, skb);
|
|
__skb_queue_tail(xmitq, _skb);
|
|
msg_set_ack(hdr, ack);
|
|
msg_set_seqno(hdr, seqno);
|
|
msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
|
|
l->rcv_unacked = 0;
|
|
seqno++;
|
|
}
|
|
l->snd_nxt = seqno;
|
|
}
|
|
|
|
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 ");
|
|
pr_info("Failed msg: usr %u, typ %u, len %u, err %u\n",
|
|
msg_user(msg), msg_type(msg), msg_size(msg),
|
|
msg_errcode(msg));
|
|
pr_info("sqno %u, prev: %x, src: %x\n",
|
|
msg_seqno(msg), msg_prevnode(msg), msg_orignode(msg));
|
|
} 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_retransm == msg_seqno(msg)) {
|
|
if (++l_ptr->stale_count > 100) {
|
|
link_retransmit_failure(l_ptr, skb);
|
|
return;
|
|
}
|
|
} else {
|
|
l_ptr->last_retransm = 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->rcv_nxt - 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++;
|
|
}
|
|
}
|
|
|
|
static int tipc_link_retransm(struct tipc_link *l, int retransm,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff *_skb, *skb = skb_peek(&l->transmq);
|
|
struct tipc_msg *hdr;
|
|
|
|
if (!skb)
|
|
return 0;
|
|
|
|
/* Detect repeated retransmit failures on same packet */
|
|
if (likely(l->last_retransm != buf_seqno(skb))) {
|
|
l->last_retransm = buf_seqno(skb);
|
|
l->stale_count = 1;
|
|
} else if (++l->stale_count > 100) {
|
|
link_retransmit_failure(l, skb);
|
|
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
|
|
}
|
|
skb_queue_walk(&l->transmq, skb) {
|
|
if (!retransm)
|
|
return 0;
|
|
hdr = buf_msg(skb);
|
|
_skb = __pskb_copy(skb, MIN_H_SIZE, GFP_ATOMIC);
|
|
if (!_skb)
|
|
return 0;
|
|
hdr = buf_msg(_skb);
|
|
msg_set_ack(hdr, l->rcv_nxt - 1);
|
|
msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
|
|
_skb->priority = TC_PRIO_CONTROL;
|
|
__skb_queue_tail(xmitq, _skb);
|
|
retransm--;
|
|
l->stats.retransmitted++;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* 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 sk_buff_head *inputq)
|
|
{
|
|
struct tipc_node *node = link->owner;
|
|
|
|
switch (msg_user(buf_msg(skb))) {
|
|
case TIPC_LOW_IMPORTANCE:
|
|
case TIPC_MEDIUM_IMPORTANCE:
|
|
case TIPC_HIGH_IMPORTANCE:
|
|
case TIPC_CRITICAL_IMPORTANCE:
|
|
case CONN_MANAGER:
|
|
skb_queue_tail(inputq, skb);
|
|
return true;
|
|
case NAME_DISTRIBUTOR:
|
|
node->bclink.recv_permitted = true;
|
|
skb_queue_tail(link->namedq, skb);
|
|
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
|
|
*/
|
|
static int tipc_link_input(struct tipc_link *l, struct sk_buff *skb,
|
|
struct sk_buff_head *inputq)
|
|
{
|
|
struct tipc_node *node = l->owner;
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
struct sk_buff **reasm_skb = &l->reasm_buf;
|
|
struct sk_buff *iskb;
|
|
struct sk_buff_head tmpq;
|
|
int usr = msg_user(hdr);
|
|
int rc = 0;
|
|
int pos = 0;
|
|
int ipos = 0;
|
|
|
|
if (unlikely(usr == TUNNEL_PROTOCOL)) {
|
|
if (msg_type(hdr) == SYNCH_MSG) {
|
|
__skb_queue_purge(&l->deferdq);
|
|
goto drop;
|
|
}
|
|
if (!tipc_msg_extract(skb, &iskb, &ipos))
|
|
return rc;
|
|
kfree_skb(skb);
|
|
skb = iskb;
|
|
hdr = buf_msg(skb);
|
|
if (less(msg_seqno(hdr), l->drop_point))
|
|
goto drop;
|
|
if (tipc_data_input(l, skb, inputq))
|
|
return rc;
|
|
usr = msg_user(hdr);
|
|
reasm_skb = &l->failover_reasm_skb;
|
|
}
|
|
|
|
if (usr == MSG_BUNDLER) {
|
|
skb_queue_head_init(&tmpq);
|
|
l->stats.recv_bundles++;
|
|
l->stats.recv_bundled += msg_msgcnt(hdr);
|
|
while (tipc_msg_extract(skb, &iskb, &pos))
|
|
tipc_data_input(l, iskb, &tmpq);
|
|
tipc_skb_queue_splice_tail(&tmpq, inputq);
|
|
return 0;
|
|
} else if (usr == MSG_FRAGMENTER) {
|
|
l->stats.recv_fragments++;
|
|
if (tipc_buf_append(reasm_skb, &skb)) {
|
|
l->stats.recv_fragmented++;
|
|
tipc_data_input(l, skb, inputq);
|
|
} else if (!*reasm_skb) {
|
|
return tipc_link_fsm_evt(l, LINK_FAILURE_EVT);
|
|
}
|
|
return 0;
|
|
} else if (usr == BCAST_PROTOCOL) {
|
|
tipc_link_sync_rcv(node, skb);
|
|
return 0;
|
|
}
|
|
drop:
|
|
kfree_skb(skb);
|
|
return 0;
|
|
}
|
|
|
|
static bool tipc_link_release_pkts(struct tipc_link *l, u16 acked)
|
|
{
|
|
bool released = false;
|
|
struct sk_buff *skb, *tmp;
|
|
|
|
skb_queue_walk_safe(&l->transmq, skb, tmp) {
|
|
if (more(buf_seqno(skb), acked))
|
|
break;
|
|
__skb_unlink(skb, &l->transmq);
|
|
kfree_skb(skb);
|
|
released = true;
|
|
}
|
|
return released;
|
|
}
|
|
|
|
/* tipc_link_build_ack_msg: prepare link acknowledge message for transmission
|
|
*/
|
|
void tipc_link_build_ack_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
|
|
{
|
|
l->rcv_unacked = 0;
|
|
l->stats.sent_acks++;
|
|
tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
|
|
}
|
|
|
|
/* tipc_link_build_reset_msg: prepare link RESET or ACTIVATE message
|
|
*/
|
|
void tipc_link_build_reset_msg(struct tipc_link *l, struct sk_buff_head *xmitq)
|
|
{
|
|
int mtyp = RESET_MSG;
|
|
|
|
if (l->state == LINK_ESTABLISHING)
|
|
mtyp = ACTIVATE_MSG;
|
|
|
|
tipc_link_build_proto_msg(l, mtyp, 0, 0, 0, 0, xmitq);
|
|
}
|
|
|
|
/* tipc_link_build_nack_msg: prepare link nack message for transmission
|
|
*/
|
|
static void tipc_link_build_nack_msg(struct tipc_link *l,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
u32 def_cnt = ++l->stats.deferred_recv;
|
|
|
|
if ((skb_queue_len(&l->deferdq) == 1) || !(def_cnt % TIPC_NACK_INTV))
|
|
tipc_link_build_proto_msg(l, STATE_MSG, 0, 0, 0, 0, xmitq);
|
|
}
|
|
|
|
/* tipc_link_rcv - process TIPC packets/messages arriving from off-node
|
|
* @l: the link that should handle the message
|
|
* @skb: TIPC packet
|
|
* @xmitq: queue to place packets to be sent after this call
|
|
*/
|
|
int tipc_link_rcv(struct tipc_link *l, struct sk_buff *skb,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff_head *defq = &l->deferdq;
|
|
struct tipc_msg *hdr;
|
|
u16 seqno, rcv_nxt, win_lim;
|
|
int rc = 0;
|
|
|
|
do {
|
|
hdr = buf_msg(skb);
|
|
seqno = msg_seqno(hdr);
|
|
rcv_nxt = l->rcv_nxt;
|
|
win_lim = rcv_nxt + TIPC_MAX_LINK_WIN;
|
|
|
|
/* Verify and update link state */
|
|
if (unlikely(msg_user(hdr) == LINK_PROTOCOL))
|
|
return tipc_link_proto_rcv(l, skb, xmitq);
|
|
|
|
if (unlikely(!link_is_up(l))) {
|
|
if (l->state == LINK_ESTABLISHING)
|
|
rc = TIPC_LINK_UP_EVT;
|
|
goto drop;
|
|
}
|
|
|
|
/* Don't send probe at next timeout expiration */
|
|
l->silent_intv_cnt = 0;
|
|
|
|
/* Drop if outside receive window */
|
|
if (unlikely(less(seqno, rcv_nxt) || more(seqno, win_lim))) {
|
|
l->stats.duplicates++;
|
|
goto drop;
|
|
}
|
|
|
|
/* Forward queues and wake up waiting users */
|
|
if (likely(tipc_link_release_pkts(l, msg_ack(hdr)))) {
|
|
tipc_link_advance_backlog(l, xmitq);
|
|
if (unlikely(!skb_queue_empty(&l->wakeupq)))
|
|
link_prepare_wakeup(l);
|
|
}
|
|
|
|
/* Defer delivery if sequence gap */
|
|
if (unlikely(seqno != rcv_nxt)) {
|
|
__tipc_skb_queue_sorted(defq, seqno, skb);
|
|
tipc_link_build_nack_msg(l, xmitq);
|
|
break;
|
|
}
|
|
|
|
/* Deliver packet */
|
|
l->rcv_nxt++;
|
|
l->stats.recv_info++;
|
|
if (!tipc_data_input(l, skb, l->inputq))
|
|
rc = tipc_link_input(l, skb, l->inputq);
|
|
if (unlikely(rc))
|
|
break;
|
|
if (unlikely(++l->rcv_unacked >= TIPC_MIN_LINK_WIN))
|
|
tipc_link_build_ack_msg(l, xmitq);
|
|
|
|
} while ((skb = __skb_dequeue(defq)));
|
|
|
|
return rc;
|
|
drop:
|
|
kfree_skb(skb);
|
|
return rc;
|
|
}
|
|
|
|
/**
|
|
* 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;
|
|
u16 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) {
|
|
u16 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;
|
|
}
|
|
|
|
/*
|
|
* Send protocol message to the other endpoint.
|
|
*/
|
|
void tipc_link_proto_xmit(struct tipc_link *l, u32 msg_typ, int probe_msg,
|
|
u32 gap, u32 tolerance, u32 priority)
|
|
{
|
|
struct sk_buff *skb = NULL;
|
|
struct sk_buff_head xmitq;
|
|
|
|
__skb_queue_head_init(&xmitq);
|
|
tipc_link_build_proto_msg(l, msg_typ, probe_msg, gap,
|
|
tolerance, priority, &xmitq);
|
|
skb = __skb_dequeue(&xmitq);
|
|
if (!skb)
|
|
return;
|
|
tipc_bearer_send(l->owner->net, l->bearer_id, skb, l->media_addr);
|
|
l->rcv_unacked = 0;
|
|
kfree_skb(skb);
|
|
}
|
|
|
|
/* tipc_link_build_proto_msg: prepare link protocol message for transmission
|
|
*/
|
|
static void tipc_link_build_proto_msg(struct tipc_link *l, int mtyp, bool probe,
|
|
u16 rcvgap, int tolerance, int priority,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff *skb = NULL;
|
|
struct tipc_msg *hdr = l->pmsg;
|
|
u16 snd_nxt = l->snd_nxt;
|
|
u16 rcv_nxt = l->rcv_nxt;
|
|
u16 rcv_last = rcv_nxt - 1;
|
|
int node_up = l->owner->bclink.recv_permitted;
|
|
|
|
/* Don't send protocol message during reset or link failover */
|
|
if (tipc_link_is_blocked(l))
|
|
return;
|
|
|
|
msg_set_type(hdr, mtyp);
|
|
msg_set_net_plane(hdr, l->net_plane);
|
|
msg_set_bcast_ack(hdr, l->owner->bclink.last_in);
|
|
msg_set_last_bcast(hdr, tipc_bclink_get_last_sent(l->owner->net));
|
|
msg_set_link_tolerance(hdr, tolerance);
|
|
msg_set_linkprio(hdr, priority);
|
|
msg_set_redundant_link(hdr, node_up);
|
|
msg_set_seq_gap(hdr, 0);
|
|
|
|
/* Compatibility: created msg must not be in sequence with pkt flow */
|
|
msg_set_seqno(hdr, snd_nxt + U16_MAX / 2);
|
|
|
|
if (mtyp == STATE_MSG) {
|
|
if (!tipc_link_is_up(l))
|
|
return;
|
|
msg_set_next_sent(hdr, snd_nxt);
|
|
|
|
/* Override rcvgap if there are packets in deferred queue */
|
|
if (!skb_queue_empty(&l->deferdq))
|
|
rcvgap = buf_seqno(skb_peek(&l->deferdq)) - rcv_nxt;
|
|
if (rcvgap) {
|
|
msg_set_seq_gap(hdr, rcvgap);
|
|
l->stats.sent_nacks++;
|
|
}
|
|
msg_set_ack(hdr, rcv_last);
|
|
msg_set_probe(hdr, probe);
|
|
if (probe)
|
|
l->stats.sent_probes++;
|
|
l->stats.sent_states++;
|
|
} else {
|
|
/* RESET_MSG or ACTIVATE_MSG */
|
|
msg_set_max_pkt(hdr, l->advertised_mtu);
|
|
msg_set_ack(hdr, l->rcv_nxt - 1);
|
|
msg_set_next_sent(hdr, 1);
|
|
}
|
|
skb = tipc_buf_acquire(msg_size(hdr));
|
|
if (!skb)
|
|
return;
|
|
skb_copy_to_linear_data(skb, hdr, msg_size(hdr));
|
|
skb->priority = TC_PRIO_CONTROL;
|
|
__skb_queue_tail(xmitq, skb);
|
|
}
|
|
|
|
/* tipc_link_tnl_prepare(): prepare and return a list of tunnel packets
|
|
* with contents of the link's transmit and backlog queues.
|
|
*/
|
|
void tipc_link_tnl_prepare(struct tipc_link *l, struct tipc_link *tnl,
|
|
int mtyp, struct sk_buff_head *xmitq)
|
|
{
|
|
struct sk_buff *skb, *tnlskb;
|
|
struct tipc_msg *hdr, tnlhdr;
|
|
struct sk_buff_head *queue = &l->transmq;
|
|
struct sk_buff_head tmpxq, tnlq;
|
|
u16 pktlen, pktcnt, seqno = l->snd_nxt;
|
|
|
|
if (!tnl)
|
|
return;
|
|
|
|
skb_queue_head_init(&tnlq);
|
|
skb_queue_head_init(&tmpxq);
|
|
|
|
/* At least one packet required for safe algorithm => add dummy */
|
|
skb = tipc_msg_create(TIPC_LOW_IMPORTANCE, TIPC_DIRECT_MSG,
|
|
BASIC_H_SIZE, 0, l->addr, link_own_addr(l),
|
|
0, 0, TIPC_ERR_NO_PORT);
|
|
if (!skb) {
|
|
pr_warn("%sunable to create tunnel packet\n", link_co_err);
|
|
return;
|
|
}
|
|
skb_queue_tail(&tnlq, skb);
|
|
tipc_link_xmit(l, &tnlq, &tmpxq);
|
|
__skb_queue_purge(&tmpxq);
|
|
|
|
/* Initialize reusable tunnel packet header */
|
|
tipc_msg_init(link_own_addr(l), &tnlhdr, TUNNEL_PROTOCOL,
|
|
mtyp, INT_H_SIZE, l->addr);
|
|
pktcnt = skb_queue_len(&l->transmq) + skb_queue_len(&l->backlogq);
|
|
msg_set_msgcnt(&tnlhdr, pktcnt);
|
|
msg_set_bearer_id(&tnlhdr, l->peer_bearer_id);
|
|
tnl:
|
|
/* Wrap each packet into a tunnel packet */
|
|
skb_queue_walk(queue, skb) {
|
|
hdr = buf_msg(skb);
|
|
if (queue == &l->backlogq)
|
|
msg_set_seqno(hdr, seqno++);
|
|
pktlen = msg_size(hdr);
|
|
msg_set_size(&tnlhdr, pktlen + INT_H_SIZE);
|
|
tnlskb = tipc_buf_acquire(pktlen + INT_H_SIZE);
|
|
if (!tnlskb) {
|
|
pr_warn("%sunable to send packet\n", link_co_err);
|
|
return;
|
|
}
|
|
skb_copy_to_linear_data(tnlskb, &tnlhdr, INT_H_SIZE);
|
|
skb_copy_to_linear_data_offset(tnlskb, INT_H_SIZE, hdr, pktlen);
|
|
__skb_queue_tail(&tnlq, tnlskb);
|
|
}
|
|
if (queue != &l->backlogq) {
|
|
queue = &l->backlogq;
|
|
goto tnl;
|
|
}
|
|
|
|
tipc_link_xmit(tnl, &tnlq, xmitq);
|
|
|
|
if (mtyp == FAILOVER_MSG) {
|
|
tnl->drop_point = l->rcv_nxt;
|
|
tnl->failover_reasm_skb = l->reasm_buf;
|
|
l->reasm_buf = NULL;
|
|
}
|
|
}
|
|
|
|
/* tipc_link_proto_rcv(): receive link level protocol message :
|
|
* Note that network plane id propagates through the network, and may
|
|
* change at any time. The node with lowest numerical id determines
|
|
* network plane
|
|
*/
|
|
static int tipc_link_proto_rcv(struct tipc_link *l, struct sk_buff *skb,
|
|
struct sk_buff_head *xmitq)
|
|
{
|
|
struct tipc_msg *hdr = buf_msg(skb);
|
|
u16 rcvgap = 0;
|
|
u16 nacked_gap = msg_seq_gap(hdr);
|
|
u16 peers_snd_nxt = msg_next_sent(hdr);
|
|
u16 peers_tol = msg_link_tolerance(hdr);
|
|
u16 peers_prio = msg_linkprio(hdr);
|
|
u16 rcv_nxt = l->rcv_nxt;
|
|
int mtyp = msg_type(hdr);
|
|
char *if_name;
|
|
int rc = 0;
|
|
|
|
if (tipc_link_is_blocked(l))
|
|
goto exit;
|
|
|
|
if (link_own_addr(l) > msg_prevnode(hdr))
|
|
l->net_plane = msg_net_plane(hdr);
|
|
|
|
switch (mtyp) {
|
|
case RESET_MSG:
|
|
|
|
/* Ignore duplicate RESET with old session number */
|
|
if ((less_eq(msg_session(hdr), l->peer_session)) &&
|
|
(l->peer_session != WILDCARD_SESSION))
|
|
break;
|
|
/* fall thru' */
|
|
|
|
case ACTIVATE_MSG:
|
|
|
|
/* Complete own link name with peer's interface name */
|
|
if_name = strrchr(l->name, ':') + 1;
|
|
if (sizeof(l->name) - (if_name - l->name) <= TIPC_MAX_IF_NAME)
|
|
break;
|
|
if (msg_data_sz(hdr) < TIPC_MAX_IF_NAME)
|
|
break;
|
|
strncpy(if_name, msg_data(hdr), TIPC_MAX_IF_NAME);
|
|
|
|
/* Update own tolerance if peer indicates a non-zero value */
|
|
if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
|
|
l->tolerance = peers_tol;
|
|
|
|
/* Update own priority if peer's priority is higher */
|
|
if (in_range(peers_prio, l->priority + 1, TIPC_MAX_LINK_PRI))
|
|
l->priority = peers_prio;
|
|
|
|
/* ACTIVATE_MSG serves as PEER_RESET if link is already down */
|
|
if ((mtyp == RESET_MSG) || !link_is_up(l))
|
|
rc = tipc_link_fsm_evt(l, LINK_PEER_RESET_EVT);
|
|
|
|
/* ACTIVATE_MSG takes up link if it was already locally reset */
|
|
if ((mtyp == ACTIVATE_MSG) && (l->state == LINK_ESTABLISHING))
|
|
rc = TIPC_LINK_UP_EVT;
|
|
|
|
l->peer_session = msg_session(hdr);
|
|
l->peer_bearer_id = msg_bearer_id(hdr);
|
|
if (l->mtu > msg_max_pkt(hdr))
|
|
l->mtu = msg_max_pkt(hdr);
|
|
break;
|
|
|
|
case STATE_MSG:
|
|
|
|
/* Update own tolerance if peer indicates a non-zero value */
|
|
if (in_range(peers_tol, TIPC_MIN_LINK_TOL, TIPC_MAX_LINK_TOL))
|
|
l->tolerance = peers_tol;
|
|
|
|
l->silent_intv_cnt = 0;
|
|
l->stats.recv_states++;
|
|
if (msg_probe(hdr))
|
|
l->stats.recv_probes++;
|
|
|
|
if (!link_is_up(l)) {
|
|
if (l->state == LINK_ESTABLISHING)
|
|
rc = TIPC_LINK_UP_EVT;
|
|
break;
|
|
}
|
|
|
|
/* Send NACK if peer has sent pkts we haven't received yet */
|
|
if (more(peers_snd_nxt, rcv_nxt) && !tipc_link_is_synching(l))
|
|
rcvgap = peers_snd_nxt - l->rcv_nxt;
|
|
if (rcvgap || (msg_probe(hdr)))
|
|
tipc_link_build_proto_msg(l, STATE_MSG, 0, rcvgap,
|
|
0, 0, xmitq);
|
|
tipc_link_release_pkts(l, msg_ack(hdr));
|
|
|
|
/* If NACK, retransmit will now start at right position */
|
|
if (nacked_gap) {
|
|
rc = tipc_link_retransm(l, nacked_gap, xmitq);
|
|
l->stats.recv_nacks++;
|
|
}
|
|
|
|
tipc_link_advance_backlog(l, xmitq);
|
|
if (unlikely(!skb_queue_empty(&l->wakeupq)))
|
|
link_prepare_wakeup(l);
|
|
}
|
|
exit:
|
|
kfree_skb(skb);
|
|
return rc;
|
|
}
|
|
|
|
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].link;
|
|
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->snd_nxt;
|
|
l_ptr->stats.recv_info = l_ptr->rcv_nxt;
|
|
}
|
|
|
|
static void link_print(struct tipc_link *l, const char *str)
|
|
{
|
|
struct sk_buff *hskb = skb_peek(&l->transmq);
|
|
u16 head = hskb ? msg_seqno(buf_msg(hskb)) : l->snd_nxt;
|
|
u16 tail = l->snd_nxt - 1;
|
|
|
|
pr_info("%s Link <%s> state %x\n", str, l->name, l->state);
|
|
pr_info("XMTQ: %u [%u-%u], BKLGQ: %u, SNDNX: %u, RCVNX: %u\n",
|
|
skb_queue_len(&l->transmq), head, tail,
|
|
skb_queue_len(&l->backlogq), l->snd_nxt, l->rcv_nxt);
|
|
}
|
|
|
|
/* 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]);
|
|
|
|
if (strcmp(name, tipc_bclink_name) == 0)
|
|
return tipc_nl_bc_link_set(net, attrs);
|
|
|
|
node = tipc_link_find_owner(net, name, &bearer_id);
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
tipc_node_lock(node);
|
|
|
|
link = node->links[bearer_id].link;
|
|
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->tolerance = 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->rcv_nxt))
|
|
goto attr_msg_full;
|
|
if (nla_put_u32(msg->skb, TIPC_NLA_LINK_TX, link->snd_nxt))
|
|
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].link)
|
|
continue;
|
|
|
|
err = __tipc_nl_add_link(net, msg,
|
|
node->links[i].link, 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 tipc_nl_msg msg;
|
|
char *name;
|
|
int err;
|
|
|
|
msg.portid = info->snd_portid;
|
|
msg.seq = info->snd_seq;
|
|
|
|
if (!info->attrs[TIPC_NLA_LINK_NAME])
|
|
return -EINVAL;
|
|
name = nla_data(info->attrs[TIPC_NLA_LINK_NAME]);
|
|
|
|
msg.skb = nlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
|
|
if (!msg.skb)
|
|
return -ENOMEM;
|
|
|
|
if (strcmp(name, tipc_bclink_name) == 0) {
|
|
err = tipc_nl_add_bc_link(net, &msg);
|
|
if (err) {
|
|
nlmsg_free(msg.skb);
|
|
return err;
|
|
}
|
|
} else {
|
|
int bearer_id;
|
|
struct tipc_node *node;
|
|
struct tipc_link *link;
|
|
|
|
node = tipc_link_find_owner(net, name, &bearer_id);
|
|
if (!node)
|
|
return -EINVAL;
|
|
|
|
tipc_node_lock(node);
|
|
link = node->links[bearer_id].link;
|
|
if (!link) {
|
|
tipc_node_unlock(node);
|
|
nlmsg_free(msg.skb);
|
|
return -EINVAL;
|
|
}
|
|
|
|
err = __tipc_nl_add_link(net, &msg, link, 0);
|
|
tipc_node_unlock(node);
|
|
if (err) {
|
|
nlmsg_free(msg.skb);
|
|
return err;
|
|
}
|
|
}
|
|
|
|
return genlmsg_reply(msg.skb, info);
|
|
}
|
|
|
|
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].link;
|
|
if (!link) {
|
|
tipc_node_unlock(node);
|
|
return -EINVAL;
|
|
}
|
|
|
|
link_reset_statistics(link);
|
|
|
|
tipc_node_unlock(node);
|
|
|
|
return 0;
|
|
}
|