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-rw-r--r--net/tipc/discover.c126
1 files changed, 107 insertions, 19 deletions
diff --git a/net/tipc/discover.c b/net/tipc/discover.c
index b4c4cd176b9b..e7655736abed 100644
--- a/net/tipc/discover.c
+++ b/net/tipc/discover.c
@@ -1,7 +1,7 @@
/*
* net/tipc/discover.c
*
- * Copyright (c) 2003-2006, 2014-2015, Ericsson AB
+ * Copyright (c) 2003-2006, 2014-2018, Ericsson AB
* Copyright (c) 2005-2006, 2010-2011, Wind River Systems
* All rights reserved.
*
@@ -78,34 +78,40 @@ struct tipc_discoverer {
* @b: ptr to bearer issuing message
*/
static void tipc_disc_init_msg(struct net *net, struct sk_buff *skb,
- u32 mtyp, struct tipc_bearer *b)
+ u32 mtyp, struct tipc_bearer *b)
{
struct tipc_net *tn = tipc_net(net);
- u32 self = tipc_own_addr(net);
u32 dest_domain = b->domain;
struct tipc_msg *hdr;
hdr = buf_msg(skb);
- tipc_msg_init(self, hdr, LINK_CONFIG, mtyp,
+ tipc_msg_init(tn->trial_addr, hdr, LINK_CONFIG, mtyp,
MAX_H_SIZE, dest_domain);
+ msg_set_size(hdr, MAX_H_SIZE + NODE_ID_LEN);
msg_set_non_seq(hdr, 1);
msg_set_node_sig(hdr, tn->random);
msg_set_node_capabilities(hdr, TIPC_NODE_CAPABILITIES);
msg_set_dest_domain(hdr, dest_domain);
msg_set_bc_netid(hdr, tn->net_id);
b->media->addr2msg(msg_media_addr(hdr), &b->addr);
+ msg_set_node_id(hdr, tipc_own_id(net));
}
-static void tipc_disc_msg_xmit(struct net *net, u32 mtyp, u32 dst, u32 src,
+static void tipc_disc_msg_xmit(struct net *net, u32 mtyp, u32 dst,
+ u32 src, u32 sugg_addr,
struct tipc_media_addr *maddr,
struct tipc_bearer *b)
{
+ struct tipc_msg *hdr;
struct sk_buff *skb;
- skb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
+ skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
if (!skb)
return;
+ hdr = buf_msg(skb);
tipc_disc_init_msg(net, skb, mtyp, b);
+ msg_set_sugg_node_addr(hdr, sugg_addr);
+ msg_set_dest_domain(hdr, dst);
tipc_bearer_xmit_skb(net, b->identity, skb, maddr);
}
@@ -126,6 +132,52 @@ static void disc_dupl_alert(struct tipc_bearer *b, u32 node_addr,
media_addr_str, b->name);
}
+/* tipc_disc_addr_trial(): - handle an address uniqueness trial from peer
+ */
+bool tipc_disc_addr_trial_msg(struct tipc_discoverer *d,
+ struct tipc_media_addr *maddr,
+ struct tipc_bearer *b,
+ u32 dst, u32 src,
+ u32 sugg_addr,
+ u8 *peer_id,
+ int mtyp)
+{
+ struct net *net = d->net;
+ struct tipc_net *tn = tipc_net(net);
+ bool trial = time_before(jiffies, tn->addr_trial_end);
+ u32 self = tipc_own_addr(net);
+
+ if (mtyp == DSC_TRIAL_FAIL_MSG) {
+ if (!trial)
+ return true;
+
+ /* Ignore if somebody else already gave new suggestion */
+ if (dst != tn->trial_addr)
+ return true;
+
+ /* Otherwise update trial address and restart trial period */
+ tn->trial_addr = sugg_addr;
+ msg_set_prevnode(buf_msg(d->skb), sugg_addr);
+ tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
+ return true;
+ }
+
+ /* Apply trial address if we just left trial period */
+ if (!trial && !self) {
+ tipc_net_finalize(net, tn->trial_addr);
+ msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
+ }
+
+ if (mtyp != DSC_TRIAL_MSG)
+ return false;
+
+ sugg_addr = tipc_node_try_addr(net, peer_id, src);
+ if (sugg_addr)
+ tipc_disc_msg_xmit(net, DSC_TRIAL_FAIL_MSG, src,
+ self, sugg_addr, maddr, b);
+ return true;
+}
+
/**
* tipc_disc_rcv - handle incoming discovery message (request or response)
* @net: applicable net namespace
@@ -139,17 +191,27 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
struct tipc_msg *hdr = buf_msg(skb);
u16 caps = msg_node_capabilities(hdr);
bool legacy = tn->legacy_addr_format;
+ u32 sugg = msg_sugg_node_addr(hdr);
u32 signature = msg_node_sig(hdr);
+ u8 peer_id[NODE_ID_LEN] = {0,};
u32 dst = msg_dest_domain(hdr);
u32 net_id = msg_bc_netid(hdr);
- u32 self = tipc_own_addr(net);
struct tipc_media_addr maddr;
u32 src = msg_prevnode(hdr);
u32 mtyp = msg_type(hdr);
bool dupl_addr = false;
bool respond = false;
+ u32 self;
int err;
+ skb_linearize(skb);
+ hdr = buf_msg(skb);
+
+ if (caps & TIPC_NODE_ID128)
+ memcpy(peer_id, msg_node_id(hdr), NODE_ID_LEN);
+ else
+ sprintf(peer_id, "%x", src);
+
err = b->media->msg2addr(b, &maddr, msg_media_addr(hdr));
kfree_skb(skb);
if (err || maddr.broadcast) {
@@ -161,6 +223,12 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
return;
if (net_id != tn->net_id)
return;
+ if (tipc_disc_addr_trial_msg(b->disc, &maddr, b, dst,
+ src, sugg, peer_id, mtyp))
+ return;
+ self = tipc_own_addr(net);
+
+ /* Message from somebody using this node's address */
if (in_own_node(net, src)) {
disc_dupl_alert(b, self, &maddr);
return;
@@ -169,8 +237,7 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
return;
if (!tipc_in_scope(legacy, b->domain, src))
return;
-
- tipc_node_check_dest(net, src, b, caps, signature,
+ tipc_node_check_dest(net, src, peer_id, b, caps, signature,
&maddr, &respond, &dupl_addr);
if (dupl_addr)
disc_dupl_alert(b, src, &maddr);
@@ -178,7 +245,7 @@ void tipc_disc_rcv(struct net *net, struct sk_buff *skb,
return;
if (mtyp != DSC_REQ_MSG)
return;
- tipc_disc_msg_xmit(net, DSC_RESP_MSG, src, self, &maddr, b);
+ tipc_disc_msg_xmit(net, DSC_RESP_MSG, src, self, 0, &maddr, b);
}
/* tipc_disc_add_dest - increment set of discovered nodes
@@ -216,9 +283,11 @@ void tipc_disc_remove_dest(struct tipc_discoverer *d)
static void tipc_disc_timeout(struct timer_list *t)
{
struct tipc_discoverer *d = from_timer(d, t, timer);
+ struct tipc_net *tn = tipc_net(d->net);
+ u32 self = tipc_own_addr(d->net);
struct tipc_media_addr maddr;
struct sk_buff *skb = NULL;
- struct net *net;
+ struct net *net = d->net;
u32 bearer_id;
spin_lock_bh(&d->lock);
@@ -228,16 +297,29 @@ static void tipc_disc_timeout(struct timer_list *t)
d->timer_intv = TIPC_DISC_INACTIVE;
goto exit;
}
+
+ /* Did we just leave the address trial period ? */
+ if (!self && !time_before(jiffies, tn->addr_trial_end)) {
+ self = tn->trial_addr;
+ tipc_net_finalize(net, self);
+ msg_set_prevnode(buf_msg(d->skb), self);
+ msg_set_type(buf_msg(d->skb), DSC_REQ_MSG);
+ }
+
/* Adjust timeout interval according to discovery phase */
- d->timer_intv *= 2;
- if (d->num_nodes && d->timer_intv > TIPC_DISC_SLOW)
- d->timer_intv = TIPC_DISC_SLOW;
- else if (!d->num_nodes && d->timer_intv > TIPC_DISC_FAST)
- d->timer_intv = TIPC_DISC_FAST;
+ if (time_before(jiffies, tn->addr_trial_end)) {
+ d->timer_intv = TIPC_DISC_INIT;
+ } else {
+ d->timer_intv *= 2;
+ if (d->num_nodes && d->timer_intv > TIPC_DISC_SLOW)
+ d->timer_intv = TIPC_DISC_SLOW;
+ else if (!d->num_nodes && d->timer_intv > TIPC_DISC_FAST)
+ d->timer_intv = TIPC_DISC_FAST;
+ }
+
mod_timer(&d->timer, jiffies + d->timer_intv);
memcpy(&maddr, &d->dest, sizeof(maddr));
skb = skb_clone(d->skb, GFP_ATOMIC);
- net = d->net;
bearer_id = d->bearer_id;
exit:
spin_unlock_bh(&d->lock);
@@ -257,18 +339,24 @@ exit:
int tipc_disc_create(struct net *net, struct tipc_bearer *b,
struct tipc_media_addr *dest, struct sk_buff **skb)
{
+ struct tipc_net *tn = tipc_net(net);
struct tipc_discoverer *d;
d = kmalloc(sizeof(*d), GFP_ATOMIC);
if (!d)
return -ENOMEM;
- d->skb = tipc_buf_acquire(MAX_H_SIZE, GFP_ATOMIC);
+ d->skb = tipc_buf_acquire(MAX_H_SIZE + NODE_ID_LEN, GFP_ATOMIC);
if (!d->skb) {
kfree(d);
return -ENOMEM;
}
-
tipc_disc_init_msg(net, d->skb, DSC_REQ_MSG, b);
+
+ /* Do we need an address trial period first ? */
+ if (!tipc_own_addr(net)) {
+ tn->addr_trial_end = jiffies + msecs_to_jiffies(1000);
+ msg_set_type(buf_msg(d->skb), DSC_TRIAL_MSG);
+ }
memcpy(&d->dest, dest, sizeof(*dest));
d->net = net;
d->bearer_id = b->identity;
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.