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gnrc/ipv6_auto_subnets: allow to configure minimal prefix length

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This commit is contained in:
Benjamin Valentin 2023-05-22 13:52:29 +02:00
parent 9358a4430d
commit 2a7691176b
1 changed files with 13 additions and 0 deletions
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13
sys/net/gnrc/routing/ipv6_auto_subnets/gnrc_ipv6_auto_subnets.c
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@ -89,6 +89,7 @@
* @author Benjamin Valentin <benjamin.valentin@ml-pa.com>
*/
#include "compiler_hints.h"
#include "net/gnrc/ipv6.h"
#include "net/gnrc/netif.h"
#include "net/gnrc/netif/hdr.h"
@ -141,6 +142,14 @@
#define CONFIG_GNRC_IPV6_AUTO_SUBNETS_PREFIX_FIX_LEN (0)
#endif
/**
* @brief Minimal length of a new prefix.
* e.g. Linux will only accept /64 prefixes for SLAAC
*/
#ifndef CONFIG_GNRC_IPV6_AUTO_SUBNETS_PREFIX_MIN_LEN
#define CONFIG_GNRC_IPV6_AUTO_SUBNETS_PREFIX_MIN_LEN (0)
#endif
/**
* @brief Number of subnets that can be configured.
*
@ -369,6 +378,10 @@ static void _configure_subnets(uint8_t subnets, uint8_t start_idx, gnrc_netif_t
return;
}
if (new_prefix_len < may_be_zero(CONFIG_GNRC_IPV6_AUTO_SUBNETS_PREFIX_MIN_LEN)) {
new_prefix_len = CONFIG_GNRC_IPV6_AUTO_SUBNETS_PREFIX_MIN_LEN;
}
while ((downstream = gnrc_netif_iter(downstream))) {
gnrc_pktsnip_t *tmp;
ipv6_addr_t new_prefix;