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Merge pull request #17429 from benpicco/gnrc/ipv6_auto_subnets-static

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gnrc/ipv6_auto_subnets: add CONFIG_GNRC_IPV6_AUTO_SUBNETS_STATIC option
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Martine Lenders 2022-10-26 14:57:40 +02:00 committed by GitHub
commit ff884dd45f
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1 changed files with 31 additions and 0 deletions
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31
sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c
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@ -153,6 +153,18 @@
#define CONFIG_GNRC_IPV6_AUTO_SUBNETS_NUMOF (1)
#endif
/**
* @brief Enable this if you have a static network that might experience
* high packet loss under certain conditions.
* If enabled, this option causes the module to always assume the highest
* number of subnets it has ever seen.
* This prevents different/conflicting subnets from being configured if
* multiple sync packets got lost.
*/
#ifndef CONFIG_GNRC_IPV6_AUTO_SUBNETS_STATIC
#define CONFIG_GNRC_IPV6_AUTO_SUBNETS_STATIC (0)
#endif
/* Code below should not be included by Doxygen */
#ifndef DOXYGEN
@ -623,6 +635,10 @@ static void *_eventloop(void *arg)
uint8_t subnets = local_subnets;
uint8_t tx_period = CONFIG_GNRC_IPV6_AUTO_SUBNETS_TX_PER_PERIOD;
/* only used with CONFIG_GNRC_IPV6_AUTO_SUBNETS_STATIC set */
uint8_t idx_old = 0;
uint8_t subnets_old = 0;
DEBUG("auto_subnets: %u local subnets\n", subnets);
if (subnets == 0) {
@ -648,6 +664,21 @@ static void *_eventloop(void *arg)
/* send subnet announcement */
_send_announce(local_subnets, &timeout_timer, &timeout_msg);
} else {
/* don't re-enumerate subnets of a downstream router goes down */
if (CONFIG_GNRC_IPV6_AUTO_SUBNETS_STATIC) {
/* If we got less subnets than before, use the old value */
if (subnets < subnets_old) {
subnets = subnets_old;
idx_start = idx_old;
}
/* Store subnet high water mark for later use */
else {
subnets_old = subnets;
idx_old = idx_start;
}
}
/* config round done, configure subnets */
_process_pio_cache(subnets, idx_start, _upstream);