| /* |
| * net/tipc/bcast.c: TIPC broadcast code |
| * |
| * Copyright (c) 2004-2006, 2014-2017, Ericsson AB |
| * Copyright (c) 2004, Intel Corporation. |
| * Copyright (c) 2005, 2010-2011, 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 <linux/tipc_config.h> |
| #include "socket.h" |
| #include "msg.h" |
| #include "bcast.h" |
| #include "link.h" |
| #include "name_table.h" |
| |
| #define BCLINK_WIN_DEFAULT 50 /* bcast link window size (default) */ |
| #define BCLINK_WIN_MIN 32 /* bcast minimum link window size */ |
| |
| const char tipc_bclink_name[] = "broadcast-link"; |
| |
| /** |
| * struct tipc_bc_base - base structure for keeping broadcast send state |
| * @link: broadcast send link structure |
| * @inputq: data input queue; will only carry SOCK_WAKEUP messages |
| * @dests: array keeping number of reachable destinations per bearer |
| * @primary_bearer: a bearer having links to all broadcast destinations, if any |
| * @bcast_support: indicates if primary bearer, if any, supports broadcast |
| * @force_bcast: forces broadcast for multicast traffic |
| * @rcast_support: indicates if all peer nodes support replicast |
| * @force_rcast: forces replicast for multicast traffic |
| * @rc_ratio: dest count as percentage of cluster size where send method changes |
| * @bc_threshold: calculated from rc_ratio; if dests > threshold use broadcast |
| */ |
| struct tipc_bc_base { |
| struct tipc_link *link; |
| struct sk_buff_head inputq; |
| int dests[MAX_BEARERS]; |
| int primary_bearer; |
| bool bcast_support; |
| bool force_bcast; |
| bool rcast_support; |
| bool force_rcast; |
| int rc_ratio; |
| int bc_threshold; |
| }; |
| |
| static struct tipc_bc_base *tipc_bc_base(struct net *net) |
| { |
| return tipc_net(net)->bcbase; |
| } |
| |
| /* tipc_bcast_get_mtu(): -get the MTU currently used by broadcast link |
| * Note: the MTU is decremented to give room for a tunnel header, in |
| * case the message needs to be sent as replicast |
| */ |
| int tipc_bcast_get_mtu(struct net *net) |
| { |
| return tipc_link_mss(tipc_bc_sndlink(net)); |
| } |
| |
| void tipc_bcast_toggle_rcast(struct net *net, bool supp) |
| { |
| tipc_bc_base(net)->rcast_support = supp; |
| } |
| |
| static void tipc_bcbase_calc_bc_threshold(struct net *net) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| int cluster_size = tipc_link_bc_peers(tipc_bc_sndlink(net)); |
| |
| bb->bc_threshold = 1 + (cluster_size * bb->rc_ratio / 100); |
| } |
| |
| /* tipc_bcbase_select_primary(): find a bearer with links to all destinations, |
| * if any, and make it primary bearer |
| */ |
| static void tipc_bcbase_select_primary(struct net *net) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| int all_dests = tipc_link_bc_peers(bb->link); |
| int i, mtu, prim; |
| |
| bb->primary_bearer = INVALID_BEARER_ID; |
| bb->bcast_support = true; |
| |
| if (!all_dests) |
| return; |
| |
| for (i = 0; i < MAX_BEARERS; i++) { |
| if (!bb->dests[i]) |
| continue; |
| |
| mtu = tipc_bearer_mtu(net, i); |
| if (mtu < tipc_link_mtu(bb->link)) |
| tipc_link_set_mtu(bb->link, mtu); |
| bb->bcast_support &= tipc_bearer_bcast_support(net, i); |
| if (bb->dests[i] < all_dests) |
| continue; |
| |
| bb->primary_bearer = i; |
| |
| /* Reduce risk that all nodes select same primary */ |
| if ((i ^ tipc_own_addr(net)) & 1) |
| break; |
| } |
| prim = bb->primary_bearer; |
| if (prim != INVALID_BEARER_ID) |
| bb->bcast_support = tipc_bearer_bcast_support(net, prim); |
| } |
| |
| void tipc_bcast_inc_bearer_dst_cnt(struct net *net, int bearer_id) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| tipc_bcast_lock(net); |
| bb->dests[bearer_id]++; |
| tipc_bcbase_select_primary(net); |
| tipc_bcast_unlock(net); |
| } |
| |
| void tipc_bcast_dec_bearer_dst_cnt(struct net *net, int bearer_id) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| tipc_bcast_lock(net); |
| bb->dests[bearer_id]--; |
| tipc_bcbase_select_primary(net); |
| tipc_bcast_unlock(net); |
| } |
| |
| /* tipc_bcbase_xmit - broadcast a packet queue across one or more bearers |
| * |
| * Note that number of reachable destinations, as indicated in the dests[] |
| * array, may transitionally differ from the number of destinations indicated |
| * in each sent buffer. We can sustain this. Excess destination nodes will |
| * drop and never acknowledge the unexpected packets, and missing destinations |
| * will either require retransmission (if they are just about to be added to |
| * the bearer), or be removed from the buffer's 'ackers' counter (if they |
| * just went down) |
| */ |
| static void tipc_bcbase_xmit(struct net *net, struct sk_buff_head *xmitq) |
| { |
| int bearer_id; |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| struct sk_buff *skb, *_skb; |
| struct sk_buff_head _xmitq; |
| |
| if (skb_queue_empty(xmitq)) |
| return; |
| |
| /* The typical case: at least one bearer has links to all nodes */ |
| bearer_id = bb->primary_bearer; |
| if (bearer_id >= 0) { |
| tipc_bearer_bc_xmit(net, bearer_id, xmitq); |
| return; |
| } |
| |
| /* We have to transmit across all bearers */ |
| __skb_queue_head_init(&_xmitq); |
| for (bearer_id = 0; bearer_id < MAX_BEARERS; bearer_id++) { |
| if (!bb->dests[bearer_id]) |
| continue; |
| |
| skb_queue_walk(xmitq, skb) { |
| _skb = pskb_copy_for_clone(skb, GFP_ATOMIC); |
| if (!_skb) |
| break; |
| __skb_queue_tail(&_xmitq, _skb); |
| } |
| tipc_bearer_bc_xmit(net, bearer_id, &_xmitq); |
| } |
| __skb_queue_purge(xmitq); |
| __skb_queue_purge(&_xmitq); |
| } |
| |
| static void tipc_bcast_select_xmit_method(struct net *net, int dests, |
| struct tipc_mc_method *method) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| unsigned long exp = method->expires; |
| |
| /* Broadcast supported by used bearer/bearers? */ |
| if (!bb->bcast_support) { |
| method->rcast = true; |
| return; |
| } |
| /* Any destinations which don't support replicast ? */ |
| if (!bb->rcast_support) { |
| method->rcast = false; |
| return; |
| } |
| /* Can current method be changed ? */ |
| method->expires = jiffies + TIPC_METHOD_EXPIRE; |
| if (method->mandatory) |
| return; |
| |
| if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL) && |
| time_before(jiffies, exp)) |
| return; |
| |
| /* Configuration as force 'broadcast' method */ |
| if (bb->force_bcast) { |
| method->rcast = false; |
| return; |
| } |
| /* Configuration as force 'replicast' method */ |
| if (bb->force_rcast) { |
| method->rcast = true; |
| return; |
| } |
| /* Configuration as 'autoselect' or default method */ |
| /* Determine method to use now */ |
| method->rcast = dests <= bb->bc_threshold; |
| } |
| |
| /* tipc_bcast_xmit - broadcast the buffer chain to all external nodes |
| * @net: the applicable net namespace |
| * @pkts: chain of buffers containing message |
| * @cong_link_cnt: set to 1 if broadcast link is congested, otherwise 0 |
| * Consumes the buffer chain. |
| * Returns 0 if success, otherwise errno: -EHOSTUNREACH,-EMSGSIZE |
| */ |
| static int tipc_bcast_xmit(struct net *net, struct sk_buff_head *pkts, |
| u16 *cong_link_cnt) |
| { |
| struct tipc_link *l = tipc_bc_sndlink(net); |
| struct sk_buff_head xmitq; |
| int rc = 0; |
| |
| __skb_queue_head_init(&xmitq); |
| tipc_bcast_lock(net); |
| if (tipc_link_bc_peers(l)) |
| rc = tipc_link_xmit(l, pkts, &xmitq); |
| tipc_bcast_unlock(net); |
| tipc_bcbase_xmit(net, &xmitq); |
| __skb_queue_purge(pkts); |
| if (rc == -ELINKCONG) { |
| *cong_link_cnt = 1; |
| rc = 0; |
| } |
| return rc; |
| } |
| |
| /* tipc_rcast_xmit - replicate and send a message to given destination nodes |
| * @net: the applicable net namespace |
| * @pkts: chain of buffers containing message |
| * @dests: list of destination nodes |
| * @cong_link_cnt: returns number of congested links |
| * @cong_links: returns identities of congested links |
| * Returns 0 if success, otherwise errno |
| */ |
| static int tipc_rcast_xmit(struct net *net, struct sk_buff_head *pkts, |
| struct tipc_nlist *dests, u16 *cong_link_cnt) |
| { |
| struct tipc_dest *dst, *tmp; |
| struct sk_buff_head _pkts; |
| u32 dnode, selector; |
| |
| selector = msg_link_selector(buf_msg(skb_peek(pkts))); |
| __skb_queue_head_init(&_pkts); |
| |
| list_for_each_entry_safe(dst, tmp, &dests->list, list) { |
| dnode = dst->node; |
| if (!tipc_msg_pskb_copy(dnode, pkts, &_pkts)) |
| return -ENOMEM; |
| |
| /* Any other return value than -ELINKCONG is ignored */ |
| if (tipc_node_xmit(net, &_pkts, dnode, selector) == -ELINKCONG) |
| (*cong_link_cnt)++; |
| } |
| return 0; |
| } |
| |
| /* tipc_mcast_send_sync - deliver a dummy message with SYN bit |
| * @net: the applicable net namespace |
| * @skb: socket buffer to copy |
| * @method: send method to be used |
| * @dests: destination nodes for message. |
| * Returns 0 if success, otherwise errno |
| */ |
| static int tipc_mcast_send_sync(struct net *net, struct sk_buff *skb, |
| struct tipc_mc_method *method, |
| struct tipc_nlist *dests) |
| { |
| struct tipc_msg *hdr, *_hdr; |
| struct sk_buff_head tmpq; |
| struct sk_buff *_skb; |
| u16 cong_link_cnt; |
| int rc = 0; |
| |
| /* Is a cluster supporting with new capabilities ? */ |
| if (!(tipc_net(net)->capabilities & TIPC_MCAST_RBCTL)) |
| return 0; |
| |
| hdr = buf_msg(skb); |
| if (msg_user(hdr) == MSG_FRAGMENTER) |
| hdr = msg_inner_hdr(hdr); |
| if (msg_type(hdr) != TIPC_MCAST_MSG) |
| return 0; |
| |
| /* Allocate dummy message */ |
| _skb = tipc_buf_acquire(MCAST_H_SIZE, GFP_KERNEL); |
| if (!_skb) |
| return -ENOMEM; |
| |
| /* Preparing for 'synching' header */ |
| msg_set_syn(hdr, 1); |
| |
| /* Copy skb's header into a dummy header */ |
| skb_copy_to_linear_data(_skb, hdr, MCAST_H_SIZE); |
| skb_orphan(_skb); |
| |
| /* Reverse method for dummy message */ |
| _hdr = buf_msg(_skb); |
| msg_set_size(_hdr, MCAST_H_SIZE); |
| msg_set_is_rcast(_hdr, !msg_is_rcast(hdr)); |
| msg_set_errcode(_hdr, TIPC_ERR_NO_PORT); |
| |
| __skb_queue_head_init(&tmpq); |
| __skb_queue_tail(&tmpq, _skb); |
| if (method->rcast) |
| rc = tipc_bcast_xmit(net, &tmpq, &cong_link_cnt); |
| else |
| rc = tipc_rcast_xmit(net, &tmpq, dests, &cong_link_cnt); |
| |
| /* This queue should normally be empty by now */ |
| __skb_queue_purge(&tmpq); |
| |
| return rc; |
| } |
| |
| /* tipc_mcast_xmit - deliver message to indicated destination nodes |
| * and to identified node local sockets |
| * @net: the applicable net namespace |
| * @pkts: chain of buffers containing message |
| * @method: send method to be used |
| * @dests: destination nodes for message. |
| * @cong_link_cnt: returns number of encountered congested destination links |
| * Consumes buffer chain. |
| * Returns 0 if success, otherwise errno |
| */ |
| int tipc_mcast_xmit(struct net *net, struct sk_buff_head *pkts, |
| struct tipc_mc_method *method, struct tipc_nlist *dests, |
| u16 *cong_link_cnt) |
| { |
| struct sk_buff_head inputq, localq; |
| bool rcast = method->rcast; |
| struct tipc_msg *hdr; |
| struct sk_buff *skb; |
| int rc = 0; |
| |
| skb_queue_head_init(&inputq); |
| __skb_queue_head_init(&localq); |
| |
| /* Clone packets before they are consumed by next call */ |
| if (dests->local && !tipc_msg_reassemble(pkts, &localq)) { |
| rc = -ENOMEM; |
| goto exit; |
| } |
| /* Send according to determined transmit method */ |
| if (dests->remote) { |
| tipc_bcast_select_xmit_method(net, dests->remote, method); |
| |
| skb = skb_peek(pkts); |
| hdr = buf_msg(skb); |
| if (msg_user(hdr) == MSG_FRAGMENTER) |
| hdr = msg_inner_hdr(hdr); |
| msg_set_is_rcast(hdr, method->rcast); |
| |
| /* Switch method ? */ |
| if (rcast != method->rcast) { |
| rc = tipc_mcast_send_sync(net, skb, method, dests); |
| if (unlikely(rc)) { |
| pr_err("Unable to send SYN: method %d, rc %d\n", |
| rcast, rc); |
| goto exit; |
| } |
| } |
| |
| if (method->rcast) |
| rc = tipc_rcast_xmit(net, pkts, dests, cong_link_cnt); |
| else |
| rc = tipc_bcast_xmit(net, pkts, cong_link_cnt); |
| } |
| |
| if (dests->local) { |
| tipc_loopback_trace(net, &localq); |
| tipc_sk_mcast_rcv(net, &localq, &inputq); |
| } |
| exit: |
| /* This queue should normally be empty by now */ |
| __skb_queue_purge(pkts); |
| return rc; |
| } |
| |
| /* tipc_bcast_rcv - receive a broadcast packet, and deliver to rcv link |
| * |
| * RCU is locked, no other locks set |
| */ |
| int tipc_bcast_rcv(struct net *net, struct tipc_link *l, struct sk_buff *skb) |
| { |
| struct tipc_msg *hdr = buf_msg(skb); |
| struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; |
| struct sk_buff_head xmitq; |
| int rc; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| if (msg_mc_netid(hdr) != tipc_netid(net) || !tipc_link_is_up(l)) { |
| kfree_skb(skb); |
| return 0; |
| } |
| |
| tipc_bcast_lock(net); |
| if (msg_user(hdr) == BCAST_PROTOCOL) |
| rc = tipc_link_bc_nack_rcv(l, skb, &xmitq); |
| else |
| rc = tipc_link_rcv(l, skb, NULL); |
| tipc_bcast_unlock(net); |
| |
| tipc_bcbase_xmit(net, &xmitq); |
| |
| /* Any socket wakeup messages ? */ |
| if (!skb_queue_empty(inputq)) |
| tipc_sk_rcv(net, inputq); |
| |
| return rc; |
| } |
| |
| /* tipc_bcast_ack_rcv - receive and handle a broadcast acknowledge |
| * |
| * RCU is locked, no other locks set |
| */ |
| void tipc_bcast_ack_rcv(struct net *net, struct tipc_link *l, |
| struct tipc_msg *hdr) |
| { |
| struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; |
| u16 acked = msg_bcast_ack(hdr); |
| struct sk_buff_head xmitq; |
| |
| /* Ignore bc acks sent by peer before bcast synch point was received */ |
| if (msg_bc_ack_invalid(hdr)) |
| return; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| tipc_bcast_lock(net); |
| tipc_link_bc_ack_rcv(l, acked, &xmitq); |
| tipc_bcast_unlock(net); |
| |
| tipc_bcbase_xmit(net, &xmitq); |
| |
| /* Any socket wakeup messages ? */ |
| if (!skb_queue_empty(inputq)) |
| tipc_sk_rcv(net, inputq); |
| } |
| |
| /* tipc_bcast_synch_rcv - check and update rcv link with peer's send state |
| * |
| * RCU is locked, no other locks set |
| */ |
| int tipc_bcast_sync_rcv(struct net *net, struct tipc_link *l, |
| struct tipc_msg *hdr) |
| { |
| struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; |
| struct sk_buff_head xmitq; |
| int rc = 0; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| tipc_bcast_lock(net); |
| if (msg_type(hdr) != STATE_MSG) { |
| tipc_link_bc_init_rcv(l, hdr); |
| } else if (!msg_bc_ack_invalid(hdr)) { |
| tipc_link_bc_ack_rcv(l, msg_bcast_ack(hdr), &xmitq); |
| rc = tipc_link_bc_sync_rcv(l, hdr, &xmitq); |
| } |
| tipc_bcast_unlock(net); |
| |
| tipc_bcbase_xmit(net, &xmitq); |
| |
| /* Any socket wakeup messages ? */ |
| if (!skb_queue_empty(inputq)) |
| tipc_sk_rcv(net, inputq); |
| return rc; |
| } |
| |
| /* tipc_bcast_add_peer - add a peer node to broadcast link and bearer |
| * |
| * RCU is locked, node lock is set |
| */ |
| void tipc_bcast_add_peer(struct net *net, struct tipc_link *uc_l, |
| struct sk_buff_head *xmitq) |
| { |
| struct tipc_link *snd_l = tipc_bc_sndlink(net); |
| |
| tipc_bcast_lock(net); |
| tipc_link_add_bc_peer(snd_l, uc_l, xmitq); |
| tipc_bcbase_select_primary(net); |
| tipc_bcbase_calc_bc_threshold(net); |
| tipc_bcast_unlock(net); |
| } |
| |
| /* tipc_bcast_remove_peer - remove a peer node from broadcast link and bearer |
| * |
| * RCU is locked, node lock is set |
| */ |
| void tipc_bcast_remove_peer(struct net *net, struct tipc_link *rcv_l) |
| { |
| struct tipc_link *snd_l = tipc_bc_sndlink(net); |
| struct sk_buff_head *inputq = &tipc_bc_base(net)->inputq; |
| struct sk_buff_head xmitq; |
| |
| __skb_queue_head_init(&xmitq); |
| |
| tipc_bcast_lock(net); |
| tipc_link_remove_bc_peer(snd_l, rcv_l, &xmitq); |
| tipc_bcbase_select_primary(net); |
| tipc_bcbase_calc_bc_threshold(net); |
| tipc_bcast_unlock(net); |
| |
| tipc_bcbase_xmit(net, &xmitq); |
| |
| /* Any socket wakeup messages ? */ |
| if (!skb_queue_empty(inputq)) |
| tipc_sk_rcv(net, inputq); |
| } |
| |
| int tipc_bclink_reset_stats(struct net *net) |
| { |
| struct tipc_link *l = tipc_bc_sndlink(net); |
| |
| if (!l) |
| return -ENOPROTOOPT; |
| |
| tipc_bcast_lock(net); |
| tipc_link_reset_stats(l); |
| tipc_bcast_unlock(net); |
| return 0; |
| } |
| |
| static int tipc_bc_link_set_queue_limits(struct net *net, u32 max_win) |
| { |
| struct tipc_link *l = tipc_bc_sndlink(net); |
| |
| if (!l) |
| return -ENOPROTOOPT; |
| if (max_win < BCLINK_WIN_MIN) |
| max_win = BCLINK_WIN_MIN; |
| if (max_win > TIPC_MAX_LINK_WIN) |
| return -EINVAL; |
| tipc_bcast_lock(net); |
| tipc_link_set_queue_limits(l, BCLINK_WIN_MIN, max_win); |
| tipc_bcast_unlock(net); |
| return 0; |
| } |
| |
| static int tipc_bc_link_set_broadcast_mode(struct net *net, u32 bc_mode) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| switch (bc_mode) { |
| case BCLINK_MODE_BCAST: |
| if (!bb->bcast_support) |
| return -ENOPROTOOPT; |
| |
| bb->force_bcast = true; |
| bb->force_rcast = false; |
| break; |
| case BCLINK_MODE_RCAST: |
| if (!bb->rcast_support) |
| return -ENOPROTOOPT; |
| |
| bb->force_bcast = false; |
| bb->force_rcast = true; |
| break; |
| case BCLINK_MODE_SEL: |
| if (!bb->bcast_support || !bb->rcast_support) |
| return -ENOPROTOOPT; |
| |
| bb->force_bcast = false; |
| bb->force_rcast = false; |
| break; |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int tipc_bc_link_set_broadcast_ratio(struct net *net, u32 bc_ratio) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| if (!bb->bcast_support || !bb->rcast_support) |
| return -ENOPROTOOPT; |
| |
| if (bc_ratio > 100 || bc_ratio <= 0) |
| return -EINVAL; |
| |
| bb->rc_ratio = bc_ratio; |
| tipc_bcast_lock(net); |
| tipc_bcbase_calc_bc_threshold(net); |
| tipc_bcast_unlock(net); |
| |
| return 0; |
| } |
| |
| int tipc_nl_bc_link_set(struct net *net, struct nlattr *attrs[]) |
| { |
| int err; |
| u32 win; |
| u32 bc_mode; |
| u32 bc_ratio; |
| struct nlattr *props[TIPC_NLA_PROP_MAX + 1]; |
| |
| if (!attrs[TIPC_NLA_LINK_PROP]) |
| return -EINVAL; |
| |
| err = tipc_nl_parse_link_prop(attrs[TIPC_NLA_LINK_PROP], props); |
| if (err) |
| return err; |
| |
| if (!props[TIPC_NLA_PROP_WIN] && |
| !props[TIPC_NLA_PROP_BROADCAST] && |
| !props[TIPC_NLA_PROP_BROADCAST_RATIO]) { |
| return -EOPNOTSUPP; |
| } |
| |
| if (props[TIPC_NLA_PROP_BROADCAST]) { |
| bc_mode = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST]); |
| err = tipc_bc_link_set_broadcast_mode(net, bc_mode); |
| } |
| |
| if (!err && props[TIPC_NLA_PROP_BROADCAST_RATIO]) { |
| bc_ratio = nla_get_u32(props[TIPC_NLA_PROP_BROADCAST_RATIO]); |
| err = tipc_bc_link_set_broadcast_ratio(net, bc_ratio); |
| } |
| |
| if (!err && props[TIPC_NLA_PROP_WIN]) { |
| win = nla_get_u32(props[TIPC_NLA_PROP_WIN]); |
| err = tipc_bc_link_set_queue_limits(net, win); |
| } |
| |
| return err; |
| } |
| |
| int tipc_bcast_init(struct net *net) |
| { |
| struct tipc_net *tn = tipc_net(net); |
| struct tipc_bc_base *bb = NULL; |
| struct tipc_link *l = NULL; |
| |
| bb = kzalloc(sizeof(*bb), GFP_KERNEL); |
| if (!bb) |
| goto enomem; |
| tn->bcbase = bb; |
| spin_lock_init(&tipc_net(net)->bclock); |
| |
| if (!tipc_link_bc_create(net, 0, 0, |
| FB_MTU, |
| BCLINK_WIN_DEFAULT, |
| BCLINK_WIN_DEFAULT, |
| 0, |
| &bb->inputq, |
| NULL, |
| NULL, |
| &l)) |
| goto enomem; |
| bb->link = l; |
| tn->bcl = l; |
| bb->rc_ratio = 10; |
| bb->rcast_support = true; |
| return 0; |
| enomem: |
| kfree(bb); |
| kfree(l); |
| return -ENOMEM; |
| } |
| |
| void tipc_bcast_stop(struct net *net) |
| { |
| struct tipc_net *tn = net_generic(net, tipc_net_id); |
| |
| synchronize_net(); |
| kfree(tn->bcbase); |
| kfree(tn->bcl); |
| } |
| |
| void tipc_nlist_init(struct tipc_nlist *nl, u32 self) |
| { |
| memset(nl, 0, sizeof(*nl)); |
| INIT_LIST_HEAD(&nl->list); |
| nl->self = self; |
| } |
| |
| void tipc_nlist_add(struct tipc_nlist *nl, u32 node) |
| { |
| if (node == nl->self) |
| nl->local = true; |
| else if (tipc_dest_push(&nl->list, node, 0)) |
| nl->remote++; |
| } |
| |
| void tipc_nlist_del(struct tipc_nlist *nl, u32 node) |
| { |
| if (node == nl->self) |
| nl->local = false; |
| else if (tipc_dest_del(&nl->list, node, 0)) |
| nl->remote--; |
| } |
| |
| void tipc_nlist_purge(struct tipc_nlist *nl) |
| { |
| tipc_dest_list_purge(&nl->list); |
| nl->remote = 0; |
| nl->local = false; |
| } |
| |
| u32 tipc_bcast_get_broadcast_mode(struct net *net) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| if (bb->force_bcast) |
| return BCLINK_MODE_BCAST; |
| |
| if (bb->force_rcast) |
| return BCLINK_MODE_RCAST; |
| |
| if (bb->bcast_support && bb->rcast_support) |
| return BCLINK_MODE_SEL; |
| |
| return 0; |
| } |
| |
| u32 tipc_bcast_get_broadcast_ratio(struct net *net) |
| { |
| struct tipc_bc_base *bb = tipc_bc_base(net); |
| |
| return bb->rc_ratio; |
| } |
| |
| void tipc_mcast_filter_msg(struct net *net, struct sk_buff_head *defq, |
| struct sk_buff_head *inputq) |
| { |
| struct sk_buff *skb, *_skb, *tmp; |
| struct tipc_msg *hdr, *_hdr; |
| bool match = false; |
| u32 node, port; |
| |
| skb = skb_peek(inputq); |
| if (!skb) |
| return; |
| |
| hdr = buf_msg(skb); |
| |
| if (likely(!msg_is_syn(hdr) && skb_queue_empty(defq))) |
| return; |
| |
| node = msg_orignode(hdr); |
| if (node == tipc_own_addr(net)) |
| return; |
| |
| port = msg_origport(hdr); |
| |
| /* Has the twin SYN message already arrived ? */ |
| skb_queue_walk(defq, _skb) { |
| _hdr = buf_msg(_skb); |
| if (msg_orignode(_hdr) != node) |
| continue; |
| if (msg_origport(_hdr) != port) |
| continue; |
| match = true; |
| break; |
| } |
| |
| if (!match) { |
| if (!msg_is_syn(hdr)) |
| return; |
| __skb_dequeue(inputq); |
| __skb_queue_tail(defq, skb); |
| return; |
| } |
| |
| /* Deliver non-SYN message from other link, otherwise queue it */ |
| if (!msg_is_syn(hdr)) { |
| if (msg_is_rcast(hdr) != msg_is_rcast(_hdr)) |
| return; |
| __skb_dequeue(inputq); |
| __skb_queue_tail(defq, skb); |
| return; |
| } |
| |
| /* Queue non-SYN/SYN message from same link */ |
| if (msg_is_rcast(hdr) == msg_is_rcast(_hdr)) { |
| __skb_dequeue(inputq); |
| __skb_queue_tail(defq, skb); |
| return; |
| } |
| |
| /* Matching SYN messages => return the one with data, if any */ |
| __skb_unlink(_skb, defq); |
| if (msg_data_sz(hdr)) { |
| kfree_skb(_skb); |
| } else { |
| __skb_dequeue(inputq); |
| kfree_skb(skb); |
| __skb_queue_tail(inputq, _skb); |
| } |
| |
| /* Deliver subsequent non-SYN messages from same peer */ |
| skb_queue_walk_safe(defq, _skb, tmp) { |
| _hdr = buf_msg(_skb); |
| if (msg_orignode(_hdr) != node) |
| continue; |
| if (msg_origport(_hdr) != port) |
| continue; |
| if (msg_is_syn(_hdr)) |
| break; |
| __skb_unlink(_skb, defq); |
| __skb_queue_tail(inputq, _skb); |
| } |
| } |