^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) * net/tipc/discover.c
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) * Copyright (c) 2003-2006, 2014-2018, Ericsson AB
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * All rights reserved.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Redistribution and use in source and binary forms, with or without
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * modification, are permitted provided that the following conditions are met:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * 1. Redistributions of source code must retain the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * notice, this list of conditions and the following disclaimer.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * 2. Redistributions in binary form must reproduce the above copyright
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * notice, this list of conditions and the following disclaimer in the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) * documentation and/or other materials provided with the distribution.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16) * 3. Neither the names of the copyright holders nor the names of its
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) * contributors may be used to endorse or promote products derived from
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18) * this software without specific prior written permission.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) * Alternatively, this software may be distributed under the terms of the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) * GNU General Public License ("GPL") version 2 as published by the Free
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) * Software Foundation.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24) * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27) * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * POSSIBILITY OF SUCH DAMAGE.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) #include "core.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) #include "node.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39) #include "discover.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) /* min delay during bearer start up */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42) #define TIPC_DISC_INIT msecs_to_jiffies(125)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* max delay if bearer has no links */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) #define TIPC_DISC_FAST msecs_to_jiffies(1000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) /* max delay if bearer has links */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) #define TIPC_DISC_SLOW msecs_to_jiffies(60000)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) /* indicates no timer in use */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48) #define TIPC_DISC_INACTIVE 0xffffffff
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51) * struct tipc_discoverer - information about an ongoing link setup request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) * @bearer_id: identity of bearer issuing requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) * @net: network namespace instance
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) * @dest: destination address for request messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) * @domain: network domain to which links can be established
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) * @num_nodes: number of nodes currently discovered (i.e. with an active link)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) * @lock: spinlock for controlling access to requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) * @skb: request message to be (repeatedly) sent
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) * @timer: timer governing period between requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60) * @timer_intv: current interval between requests (in ms)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) struct tipc_discoverer {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) u32 bearer_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64) struct tipc_media_addr dest;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) struct net *net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) u32 domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) int num_nodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) spinlock_t lock;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) struct timer_list timer;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) unsigned long timer_intv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) * tipc_disc_init_msg - initialize a link setup message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76) * @net: the applicable net namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) * @mtyp: message type (request or response)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) * @b: ptr to bearer issuing message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static void tipc_disc_init_msg(struct net *net, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) u32 mtyp, struct tipc_bearer *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83) struct tipc_net *tn = tipc_net(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) u32 dest_domain = b->domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) struct tipc_msg *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) hdr = buf_msg(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) tipc_msg_init(tn->trial_addr, hdr, LINK_CONFIG, mtyp,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) MAX_H_SIZE, dest_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 90) msg_set_size(hdr, MAX_H_SIZE + NODE_ID_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 91) msg_set_non_seq(hdr, 1);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 92) msg_set_node_sig(hdr, tn->random);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 93) msg_set_node_capabilities(hdr, TIPC_NODE_CAPABILITIES);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 94) msg_set_dest_domain(hdr, dest_domain);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 95) msg_set_bc_netid(hdr, tn->net_id);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 96) b->media->addr2msg(msg_media_addr(hdr), &b->addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 97) msg_set_peer_net_hash(hdr, tipc_net_hash_mixes(net, tn->random));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 98) msg_set_node_id(hdr, tipc_own_id(net));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 99) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 100)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 101) static void tipc_disc_msg_xmit(struct net *net, u32 mtyp, u32 dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 102) u32 src, u32 sugg_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 103) struct tipc_media_addr *maddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 104) struct tipc_bearer *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 105) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 106) struct tipc_msg *hdr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 107) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 108)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 109) skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 110) if (!skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 111) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 112) hdr = buf_msg(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 113) tipc_disc_init_msg(net, skb, mtyp, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 114) msg_set_sugg_node_addr(hdr, sugg_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 115) msg_set_dest_domain(hdr, dst);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 116) tipc_bearer_xmit_skb(net, b->identity, skb, maddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 117) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 118)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 119) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 120) * disc_dupl_alert - issue node address duplication alert
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 121) * @b: pointer to bearer detecting duplication
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 122) * @node_addr: duplicated node address
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 123) * @media_addr: media address advertised by duplicated node
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 124) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 125) static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 126) struct tipc_media_addr *media_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 127) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 128) char media_addr_str[64];
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 129)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 130) tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str),
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 131) media_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 132) pr_warn("Duplicate %x using %s seen on <%s>\n", node_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 133) media_addr_str, b->name);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 134) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 135)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 136) /* tipc_disc_addr_trial(): - handle an address uniqueness trial from peer
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 137) * Returns true if message should be dropped by caller, i.e., if it is a
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 138) * trial message or we are inside trial period. Otherwise false.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 139) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 140) static bool tipc_disc_addr_trial_msg(struct tipc_discoverer *d,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 141) struct tipc_media_addr *maddr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 142) struct tipc_bearer *b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 143) u32 dst, u32 src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 144) u32 sugg_addr,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 145) u8 *peer_id,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 146) int mtyp)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 147) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 148) struct net *net = d->net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 149) struct tipc_net *tn = tipc_net(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 150) bool trial = time_before(jiffies, tn->addr_trial_end);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 151) u32 self = tipc_own_addr(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 152)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 153) if (mtyp == DSC_TRIAL_FAIL_MSG) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 154) if (!trial)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 155) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 156)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 157) /* Ignore if somebody else already gave new suggestion */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 158) if (dst != tn->trial_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 159) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 160)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 161) /* Otherwise update trial address and restart trial period */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 162) tn->trial_addr = sugg_addr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 163) msg_set_prevnode(buf_msg(d->skb), sugg_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 164) tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 165) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 166) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 167)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 168) /* Apply trial address if we just left trial period */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 169) if (!trial && !self) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 170) tipc_sched_net_finalize(net, tn->trial_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 171) msg_set_prevnode(buf_msg(d->skb), tn->trial_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 172) msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 173) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 174)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 175) /* Accept regular link requests/responses only after trial period */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 176) if (mtyp != DSC_TRIAL_MSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 177) return trial;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 178)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 179) sugg_addr = tipc_node_try_addr(net, peer_id, src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 180) if (sugg_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 181) tipc_disc_msg_xmit(net, DSC_TRIAL_FAIL_MSG, src,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 182) self, sugg_addr, maddr, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 183) return true;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 184) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 185)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 186) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 187) * tipc_disc_rcv - handle incoming discovery message (request or response)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 188) * @net: applicable net namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 189) * @skb: buffer containing message
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 190) * @b: bearer that message arrived on
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 191) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 192) void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 193) struct tipc_bearer *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 194) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 195) struct tipc_net *tn = tipc_net(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 196) struct tipc_msg *hdr = buf_msg(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 197) u32 pnet_hash = msg_peer_net_hash(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 198) u16 caps = msg_node_capabilities(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 199) bool legacy = tn->legacy_addr_format;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 200) u32 sugg = msg_sugg_node_addr(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 201) u32 signature = msg_node_sig(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 202) u8 peer_id[NODE_ID_LEN] = {0,};
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 203) u32 dst = msg_dest_domain(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 204) u32 net_id = msg_bc_netid(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 205) struct tipc_media_addr maddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 206) u32 src = msg_prevnode(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 207) u32 mtyp = msg_type(hdr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 208) bool dupl_addr = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 209) bool respond = false;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 210) u32 self;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 211) int err;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 212)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 213) skb_linearize(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 214) hdr = buf_msg(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 215)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 216) if (caps & TIPC_NODE_ID128)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 217) memcpy(peer_id, msg_node_id(hdr), NODE_ID_LEN);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 218) else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 219) sprintf(peer_id, "%x", src);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 220)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 221) err = b->media->msg2addr(b, &maddr, msg_media_addr(hdr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 222) kfree_skb(skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 223) if (err || maddr.broadcast) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 224) pr_warn_ratelimited("Rcv corrupt discovery message\n");
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 225) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 226) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 227) /* Ignore discovery messages from own node */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 228) if (!memcmp(&maddr, &b->addr, sizeof(maddr)))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 229) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 230) if (net_id != tn->net_id)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 231) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 232) if (tipc_disc_addr_trial_msg(b->disc, &maddr, b, dst,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 233) src, sugg, peer_id, mtyp))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 234) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 235) self = tipc_own_addr(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 236)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 237) /* Message from somebody using this node's address */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 238) if (in_own_node(net, src)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 239) disc_dupl_alert(b, self, &maddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 240) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 241) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 242) if (!tipc_in_scope(legacy, dst, self))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 243) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 244) if (!tipc_in_scope(legacy, b->domain, src))
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 245) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 246) tipc_node_check_dest(net, src, peer_id, b, caps, signature, pnet_hash,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 247) &maddr, &respond, &dupl_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 248) if (dupl_addr)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 249) disc_dupl_alert(b, src, &maddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 250) if (!respond)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 251) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 252) if (mtyp != DSC_REQ_MSG)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 253) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 254) tipc_disc_msg_xmit(net, DSC_RESP_MSG, src, self, 0, &maddr, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 255) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 256)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 257) /* tipc_disc_add_dest - increment set of discovered nodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 258) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 259) void tipc_disc_add_dest(struct tipc_discoverer *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 260) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 261) spin_lock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 262) d->num_nodes++;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 263) spin_unlock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 264) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 265)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 266) /* tipc_disc_remove_dest - decrement set of discovered nodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 267) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 268) void tipc_disc_remove_dest(struct tipc_discoverer *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 269) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 270) int intv, num;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 271)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 272) spin_lock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 273) d->num_nodes--;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 274) num = d->num_nodes;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 275) intv = d->timer_intv;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 276) if (!num && (intv == TIPC_DISC_INACTIVE || intv > TIPC_DISC_FAST)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 277) d->timer_intv = TIPC_DISC_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 278) mod_timer(&d->timer, jiffies + d->timer_intv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 279) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 280) spin_unlock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 281) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 282)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 283) /* tipc_disc_timeout - send a periodic link setup request
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 284) * Called whenever a link setup request timer associated with a bearer expires.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 285) * - Keep doubling time between sent request until limit is reached;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 286) * - Hold at fast polling rate if we don't have any associated nodes
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 287) * - Otherwise hold at slow polling rate
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 288) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 289) static void tipc_disc_timeout(struct timer_list *t)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 290) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 291) struct tipc_discoverer *d = from_timer(d, t, timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 292) struct tipc_net *tn = tipc_net(d->net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 293) struct tipc_media_addr maddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 294) struct sk_buff *skb = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 295) struct net *net = d->net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 296) u32 bearer_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 297)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 298) spin_lock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 299)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 300) /* Stop searching if only desired node has been found */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 301) if (tipc_node(d->domain) && d->num_nodes) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 302) d->timer_intv = TIPC_DISC_INACTIVE;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 303) goto exit;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 304) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 305)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 306) /* Did we just leave trial period ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 307) if (!time_before(jiffies, tn->addr_trial_end) && !tipc_own_addr(net)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 308) mod_timer(&d->timer, jiffies + TIPC_DISC_INIT);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 309) spin_unlock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 310) tipc_sched_net_finalize(net, tn->trial_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 311) return;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 312) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 313)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 314) /* Adjust timeout interval according to discovery phase */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 315) if (time_before(jiffies, tn->addr_trial_end)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 316) d->timer_intv = TIPC_DISC_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 317) } else {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 318) d->timer_intv *= 2;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 319) if (d->num_nodes && d->timer_intv > TIPC_DISC_SLOW)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 320) d->timer_intv = TIPC_DISC_SLOW;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 321) else if (!d->num_nodes && d->timer_intv > TIPC_DISC_FAST)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 322) d->timer_intv = TIPC_DISC_FAST;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 323) msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 324) msg_set_prevnode(buf_msg(d->skb), tn->trial_addr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 325) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 326)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 327) mod_timer(&d->timer, jiffies + d->timer_intv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 328) memcpy(&maddr, &d->dest, sizeof(maddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 329) skb = skb_clone(d->skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 330) bearer_id = d->bearer_id;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 331) exit:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 332) spin_unlock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 333) if (skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 334) tipc_bearer_xmit_skb(net, bearer_id, skb, &maddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 335) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 336)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 337) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 338) * tipc_disc_create - create object to send periodic link setup requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 339) * @net: the applicable net namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 340) * @b: ptr to bearer issuing requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 341) * @dest: destination address for request messages
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 342) * @skb: pointer to created frame
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 343) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 344) * Returns 0 if successful, otherwise -errno.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 345) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 346) int tipc_disc_create(struct net *net, struct tipc_bearer *b,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 347) struct tipc_media_addr *dest, struct sk_buff **skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 348) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 349) struct tipc_net *tn = tipc_net(net);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 350) struct tipc_discoverer *d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 351)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 352) d = kmalloc(sizeof(*d), GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 353) if (!d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 354) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 355) d->skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 356) if (!d->skb) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 357) kfree(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 358) return -ENOMEM;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 359) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 360) tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 361)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 362) /* Do we need an address trial period first ? */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 363) if (!tipc_own_addr(net)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 364) tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 365) msg_set_type(buf_msg(d->skb), DSC_TRIAL_MSG);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 366) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 367) memcpy(&d->dest, dest, sizeof(*dest));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 368) d->net = net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 369) d->bearer_id = b->identity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 370) d->domain = b->domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 371) d->num_nodes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 372) d->timer_intv = TIPC_DISC_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 373) spin_lock_init(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 374) timer_setup(&d->timer, tipc_disc_timeout, 0);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 375) mod_timer(&d->timer, jiffies + d->timer_intv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 376) b->disc = d;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 377) *skb = skb_clone(d->skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 378) return 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 379) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 380)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 381) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 382) * tipc_disc_delete - destroy object sending periodic link setup requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 383) * @d: ptr to link duest structure
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 384) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 385) void tipc_disc_delete(struct tipc_discoverer *d)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 386) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 387) del_timer_sync(&d->timer);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 388) kfree_skb(d->skb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 389) kfree(d);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 390) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 391)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 392) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 393) * tipc_disc_reset - reset object to send periodic link setup requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 394) * @net: the applicable net namespace
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 395) * @b: ptr to bearer issuing requests
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 396) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 397) void tipc_disc_reset(struct net *net, struct tipc_bearer *b)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 398) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 399) struct tipc_discoverer *d = b->disc;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 400) struct tipc_media_addr maddr;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 401) struct sk_buff *skb;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 402)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 403) spin_lock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 404) tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 405) d->net = net;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 406) d->bearer_id = b->identity;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 407) d->domain = b->domain;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 408) d->num_nodes = 0;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 409) d->timer_intv = TIPC_DISC_INIT;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 410) memcpy(&maddr, &d->dest, sizeof(maddr));
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 411) mod_timer(&d->timer, jiffies + d->timer_intv);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 412) skb = skb_clone(d->skb, GFP_ATOMIC);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 413) spin_unlock_bh(&d->lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 414) if (skb)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 415) tipc_bearer_xmit_skb(net, b->identity, skb, &maddr);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 416) }
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
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