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mDNS: probe rate limiting if more then 15 conflicts occur in 10s

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According to RFC6762 section 8.1:
If fifteen conflicts occur within any ten-second period, then the
host MUST wait at least five seconds before each successive
additional probe attempt.
If the host restarts mDNS, instead of a probe wait timeout randomly
chosen between 0 and 250ms, we wait 5s if more then 15 conflicts
occured in 10seconds. This flag is reset from the moment probing
succeeded.
This commit is contained in:
Jasper Verschueren
2018-11-19 10:59:16 +01:00
committed by Dirk Ziegelmeier
parent 593c02aed4
commit 19cbf2a652
2 changed files with 78 additions and 6 deletions
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16
src/include/lwip/apps/mdns_priv.h
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@@ -64,6 +64,14 @@ extern "C" {
#define MDNS_TTL_120 120
#define MDNS_TTL_4500 4500
/* RFC6762 section 8.1: If fifteen conflicts occur within any ten-second period,
* then the host MUST wait at least five seconds before each successive
* additional probe attempt.
*/
#define MDNS_PROBE_MAX_CONFLICTS_BEFORE_RATE_LIMIT 15
#define MDNS_PROBE_MAX_CONFLICTS_TIME_WINDOW 10000
#define MDNS_PROBE_MAX_CONFLICTS_TIMEOUT 5000
/* Domain structs - also visible for unit tests */
struct mdns_domain {
@@ -196,6 +204,14 @@ struct mdns_host {
/** delayed msg struct for IPv6 */
struct mdns_delayed_msg ipv6;
#endif
/** Timestamp of probe conflict saved in list */
u32_t conflict_time[MDNS_PROBE_MAX_CONFLICTS_BEFORE_RATE_LIMIT];
/** Rate limit flag */
u8_t rate_limit_activated;
/** List index for timestamps */
u8_t index;
/** number of conflicts since startup */
u8_t num_conflicts;
};
struct mdns_host* netif_mdns_data(struct netif *netif);