4 * Copyright (c) 2003-2006, 2014-2018, Ericsson AB
5 * Copyright (c) 2005-2006, 2010-2011, Wind River Systems
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41 /* min delay during bearer start up */
42 #define TIPC_DISC_INIT msecs_to_jiffies(125)
43 /* max delay if bearer has no links */
44 #define TIPC_DISC_FAST msecs_to_jiffies(1000)
45 /* max delay if bearer has links */
46 #define TIPC_DISC_SLOW msecs_to_jiffies(60000)
47 /* indicates no timer in use */
48 #define TIPC_DISC_INACTIVE 0xffffffff
51 * struct tipc_discoverer - information about an ongoing link setup request
52 * @bearer_id: identity of bearer issuing requests
53 * @net: network namespace instance
54 * @dest: destination address for request messages
55 * @domain: network domain to which links can be established
56 * @num_nodes: number of nodes currently discovered (i.e. with an active link)
57 * @lock: spinlock for controlling access to requests
58 * @skb: request message to be (repeatedly) sent
59 * @timer: timer governing period between requests
60 * @timer_intv: current interval between requests (in ms)
62 struct tipc_discoverer {
64 struct tipc_media_addr dest;
70 struct timer_list timer;
71 unsigned long timer_intv;
75 * tipc_disc_init_msg - initialize a link setup message
76 * @net: the applicable net namespace
77 * @type: message type (request or response)
78 * @b: ptr to bearer issuing message
80 static void tipc_disc_init_msg(struct net *net, struct sk_buff *skb,
81 u32 mtyp, struct tipc_bearer *b)
83 struct tipc_net *tn = tipc_net(net);
84 u32 dest_domain = b->domain;
88 tipc_msg_init(tn->trial_addr, hdr, LINK_CONFIG, mtyp,
89 MAX_H_SIZE, dest_domain);
90 msg_set_size(hdr, MAX_H_SIZE + NODE_ID_LEN);
91 msg_set_non_seq(hdr, 1);
92 msg_set_node_sig(hdr, tn->random);
93 msg_set_node_capabilities(hdr, TIPC_NODE_CAPABILITIES);
94 msg_set_dest_domain(hdr, dest_domain);
95 msg_set_bc_netid(hdr, tn->net_id);
96 b->media->addr2msg(msg_media_addr(hdr), &b->addr);
97 msg_set_peer_net_hash(hdr, tipc_net_hash_mixes(net, tn->random));
98 msg_set_node_id(hdr, tipc_own_id(net));
101 static void tipc_disc_msg_xmit(struct net *net, u32 mtyp, u32 dst,
102 u32 src, u32 sugg_addr,
103 struct tipc_media_addr *maddr,
104 struct tipc_bearer *b)
106 struct tipc_msg *hdr;
109 skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
113 tipc_disc_init_msg(net, skb, mtyp, b);
114 msg_set_sugg_node_addr(hdr, sugg_addr);
115 msg_set_dest_domain(hdr, dst);
116 tipc_bearer_xmit_skb(net, b->identity, skb, maddr);
120 * disc_dupl_alert - issue node address duplication alert
121 * @b: pointer to bearer detecting duplication
122 * @node_addr: duplicated node address
123 * @media_addr: media address advertised by duplicated node
125 static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
126 struct tipc_media_addr *media_addr)
128 char media_addr_str[64];
130 tipc_media_addr_printf(media_addr_str, sizeof(media_addr_str),
132 pr_warn("Duplicate %x using %s seen on <%s>\n", node_addr,
133 media_addr_str, b->name);
136 /* tipc_disc_addr_trial(): - handle an address uniqueness trial from peer
137 * Returns true if message should be dropped by caller, i.e., if it is a
138 * trial message or we are inside trial period. Otherwise false.
140 static bool tipc_disc_addr_trial_msg(struct tipc_discoverer *d,
141 struct tipc_media_addr *maddr,
142 struct tipc_bearer *b,
148 struct net *net = d->net;
149 struct tipc_net *tn = tipc_net(net);
150 bool trial = time_before(jiffies, tn->addr_trial_end);
151 u32 self = tipc_own_addr(net);
153 if (mtyp == DSC_TRIAL_FAIL_MSG) {
157 /* Ignore if somebody else already gave new suggestion */
158 if (dst != tn->trial_addr)
161 /* Otherwise update trial address and restart trial period */
162 tn->trial_addr = sugg_addr;
163 msg_set_prevnode(buf_msg(d->skb), sugg_addr);
164 tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
168 /* Apply trial address if we just left trial period */
169 if (!trial && !self) {
170 tipc_sched_net_finalize(net, tn->trial_addr);
171 msg_set_prevnode(buf_msg(d->skb), tn->trial_addr);
172 msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
175 /* Accept regular link requests/responses only after trial period */
176 if (mtyp != DSC_TRIAL_MSG)
179 sugg_addr = tipc_node_try_addr(net, peer_id, src);
181 tipc_disc_msg_xmit(net, DSC_TRIAL_FAIL_MSG, src,
182 self, sugg_addr, maddr, b);
187 * tipc_disc_rcv - handle incoming discovery message (request or response)
188 * @net: applicable net namespace
189 * @skb: buffer containing message
190 * @b: bearer that message arrived on
192 void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
193 struct tipc_bearer *b)
195 struct tipc_net *tn = tipc_net(net);
196 struct tipc_msg *hdr = buf_msg(skb);
197 u32 pnet_hash = msg_peer_net_hash(hdr);
198 u16 caps = msg_node_capabilities(hdr);
199 bool legacy = tn->legacy_addr_format;
200 u32 sugg = msg_sugg_node_addr(hdr);
201 u32 signature = msg_node_sig(hdr);
202 u8 peer_id[NODE_ID_LEN] = {0,};
203 u32 dst = msg_dest_domain(hdr);
204 u32 net_id = msg_bc_netid(hdr);
205 struct tipc_media_addr maddr;
206 u32 src = msg_prevnode(hdr);
207 u32 mtyp = msg_type(hdr);
208 bool dupl_addr = false;
209 bool respond = false;
216 if (caps & TIPC_NODE_ID128)
217 memcpy(peer_id, msg_node_id(hdr), NODE_ID_LEN);
219 sprintf(peer_id, "%x", src);
221 err = b->media->msg2addr(b, &maddr, msg_media_addr(hdr));
223 if (err || maddr.broadcast) {
224 pr_warn_ratelimited("Rcv corrupt discovery message\n");
227 /* Ignore discovery messages from own node */
228 if (!memcmp(&maddr, &b->addr, sizeof(maddr)))
230 if (net_id != tn->net_id)
232 if (tipc_disc_addr_trial_msg(b->disc, &maddr, b, dst,
233 src, sugg, peer_id, mtyp))
235 self = tipc_own_addr(net);
237 /* Message from somebody using this node's address */
238 if (in_own_node(net, src)) {
239 disc_dupl_alert(b, self, &maddr);
242 if (!tipc_in_scope(legacy, dst, self))
244 if (!tipc_in_scope(legacy, b->domain, src))
246 tipc_node_check_dest(net, src, peer_id, b, caps, signature, pnet_hash,
247 &maddr, &respond, &dupl_addr);
249 disc_dupl_alert(b, src, &maddr);
252 if (mtyp != DSC_REQ_MSG)
254 tipc_disc_msg_xmit(net, DSC_RESP_MSG, src, self, 0, &maddr, b);
257 /* tipc_disc_add_dest - increment set of discovered nodes
259 void tipc_disc_add_dest(struct tipc_discoverer *d)
261 spin_lock_bh(&d->lock);
263 spin_unlock_bh(&d->lock);
266 /* tipc_disc_remove_dest - decrement set of discovered nodes
268 void tipc_disc_remove_dest(struct tipc_discoverer *d)
272 spin_lock_bh(&d->lock);
275 intv = d->timer_intv;
276 if (!num && (intv == TIPC_DISC_INACTIVE || intv > TIPC_DISC_FAST)) {
277 d->timer_intv = TIPC_DISC_INIT;
278 mod_timer(&d->timer, jiffies + d->timer_intv);
280 spin_unlock_bh(&d->lock);
283 /* tipc_disc_timeout - send a periodic link setup request
284 * Called whenever a link setup request timer associated with a bearer expires.
285 * - Keep doubling time between sent request until limit is reached;
286 * - Hold at fast polling rate if we don't have any associated nodes
287 * - Otherwise hold at slow polling rate
289 static void tipc_disc_timeout(struct timer_list *t)
291 struct tipc_discoverer *d = from_timer(d, t, timer);
292 struct tipc_net *tn = tipc_net(d->net);
293 struct tipc_media_addr maddr;
294 struct sk_buff *skb = NULL;
295 struct net *net = d->net;
298 spin_lock_bh(&d->lock);
300 /* Stop searching if only desired node has been found */
301 if (tipc_node(d->domain) && d->num_nodes) {
302 d->timer_intv = TIPC_DISC_INACTIVE;
306 /* Did we just leave trial period ? */
307 if (!time_before(jiffies, tn->addr_trial_end) && !tipc_own_addr(net)) {
308 mod_timer(&d->timer, jiffies + TIPC_DISC_INIT);
309 spin_unlock_bh(&d->lock);
310 tipc_sched_net_finalize(net, tn->trial_addr);
314 /* Adjust timeout interval according to discovery phase */
315 if (time_before(jiffies, tn->addr_trial_end)) {
316 d->timer_intv = TIPC_DISC_INIT;
319 if (d->num_nodes && d->timer_intv > TIPC_DISC_SLOW)
320 d->timer_intv = TIPC_DISC_SLOW;
321 else if (!d->num_nodes && d->timer_intv > TIPC_DISC_FAST)
322 d->timer_intv = TIPC_DISC_FAST;
323 msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
324 msg_set_prevnode(buf_msg(d->skb), tn->trial_addr);
327 mod_timer(&d->timer, jiffies + d->timer_intv);
328 memcpy(&maddr, &d->dest, sizeof(maddr));
329 skb = skb_clone(d->skb, GFP_ATOMIC);
330 bearer_id = d->bearer_id;
332 spin_unlock_bh(&d->lock);
334 tipc_bearer_xmit_skb(net, bearer_id, skb, &maddr);
338 * tipc_disc_create - create object to send periodic link setup requests
339 * @net: the applicable net namespace
340 * @b: ptr to bearer issuing requests
341 * @dest: destination address for request messages
342 * @dest_domain: network domain to which links can be established
344 * Returns 0 if successful, otherwise -errno.
346 int tipc_disc_create(struct net *net, struct tipc_bearer *b,
347 struct tipc_media_addr *dest, struct sk_buff **skb)
349 struct tipc_net *tn = tipc_net(net);
350 struct tipc_discoverer *d;
352 d = kmalloc(sizeof(*d), GFP_ATOMIC);
355 d->skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
360 tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
362 /* Do we need an address trial period first ? */
363 if (!tipc_own_addr(net)) {
364 tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
365 msg_set_type(buf_msg(d->skb), DSC_TRIAL_MSG);
367 memcpy(&d->dest, dest, sizeof(*dest));
369 d->bearer_id = b->identity;
370 d->domain = b->domain;
372 d->timer_intv = TIPC_DISC_INIT;
373 spin_lock_init(&d->lock);
374 timer_setup(&d->timer, tipc_disc_timeout, 0);
375 mod_timer(&d->timer, jiffies + d->timer_intv);
377 *skb = skb_clone(d->skb, GFP_ATOMIC);
382 * tipc_disc_delete - destroy object sending periodic link setup requests
383 * @d: ptr to link duest structure
385 void tipc_disc_delete(struct tipc_discoverer *d)
387 del_timer_sync(&d->timer);
393 * tipc_disc_reset - reset object to send periodic link setup requests
394 * @net: the applicable net namespace
395 * @b: ptr to bearer issuing requests
396 * @dest_domain: network domain to which links can be established
398 void tipc_disc_reset(struct net *net, struct tipc_bearer *b)
400 struct tipc_discoverer *d = b->disc;
401 struct tipc_media_addr maddr;
404 spin_lock_bh(&d->lock);
405 tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
407 d->bearer_id = b->identity;
408 d->domain = b->domain;
410 d->timer_intv = TIPC_DISC_INIT;
411 memcpy(&maddr, &d->dest, sizeof(maddr));
412 mod_timer(&d->timer, jiffies + d->timer_intv);
413 skb = skb_clone(d->skb, GFP_ATOMIC);
414 spin_unlock_bh(&d->lock);
416 tipc_bearer_xmit_skb(net, b->identity, skb, &maddr);