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Reduce the potential for packet storms

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This commit is contained in:
Jeremy Lakeman 2012-09-19 15:55:29 +09:30
parent dc8a453b7f
commit 0538e95be8
4 changed files with 22 additions and 17 deletions
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9
dataformats.c
View File

@ -57,6 +57,15 @@ int is_xstring(const char *text, int len)
return _is_xstring(text, len);
}
/* Does this whole buffer contain the same value? */
int is_all_matching(unsigned char *ptr, int len, int value){
int i;
for (i=0;i<len;i++)
if (ptr[i]!=value)
return 0;
return 1;
}
char *tohex(char *dstHex, const unsigned char *srcBinary, size_t bytes)
{
char *p;

5
overlay_interface.c
View File

@ -1074,8 +1074,11 @@ overlay_stuff_packet(struct outgoing_packet *packet, overlay_txqueue *queue, tim
case REACHABLE_BROADCAST:
if (!frame->sendBroadcast){
if (frame->ttl>2)
frame->ttl=2;
frame->sendBroadcast=1;
overlay_broadcast_generate_address(&frame->broadcast_id);
if (is_all_matching(frame->broadcast_id.id, BROADCAST_LEN, 0))
overlay_broadcast_generate_address(&frame->broadcast_id);
int i;
for(i=0;i<OVERLAY_MAX_INTERFACES;i++)
frame->broadcast_sent_via[i]=0;

23
overlay_mdp.c
View File

@ -37,22 +37,10 @@ struct sched_ent mdp_named={
};
// is the SID entirely 0xFF?
static int is_broadcast(const unsigned char *sid){
int i;
for (i=0;i<SID_SIZE;i++)
if (sid[i]!=0xFF)
return 0;
return 1;
}
#define is_broadcast(SID) is_all_matching(SID, SID_SIZE, 0xFF)
// is the SID entirely 0x00?
static int is_sid_any(unsigned char *sid){
int i;
for (i=0;i<SID_SIZE;i++)
if (sid[i])
return 0;
return 1;
}
#define is_sid_any(SID) is_all_matching(SID, SID_SIZE, 0)
int overlay_mdp_setup_sockets()
{
@ -431,8 +419,8 @@ int overlay_saw_mdp_frame(overlay_mdp_frame *mdp, time_ms_t now)
more prudent path.
*/
if (0)
WHYF("Received packet with listener (MDP ports: src=%s*:%d, dst=%d)",
if (debug & DEBUG_MDPREQUESTS)
DEBUGF("Received packet with listener (MDP ports: src=%s*:%d, dst=%d)",
alloca_tohex(mdp->out.src.sid, 7),
mdp->out.src.port,mdp->out.dst.port);
@ -499,6 +487,9 @@ int overlay_saw_mdp_frame(overlay_mdp_frame *mdp, time_ms_t now)
bcopy(&mdp->out.payload[0],&did[0],pll);
did[pll]=0;
if (debug & DEBUG_MDPREQUESTS)
DEBUG("MDP_PORT_DNALOOKUP");
int results=0;
while(keyring_find_did(keyring,&cn,&in,&kp,did))
{

2
serval.h
View File

@ -456,6 +456,8 @@ int fromhexstr(unsigned char *dstBinary, const char *srcHex, size_t bytes);
int hexvalue(char c);
char *str_toupper_inplace(char *s);
int is_all_matching(unsigned char *ptr, int len, int value);
int str_is_subscriber_id(const char *sid);
int strn_is_subscriber_id(const char *sid, size_t *lenp);
int str_is_did(const char *did);