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Add #define for minimum IPv6 MTU length

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This commit is contained in:
Dirk Ziegelmeier 2019-03-28 08:16:29 +01:00 committed by Simon Goldschmidt
parent 379d55044e
commit ba3b04e7fe
4 changed files with 6 additions and 4 deletions
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4
src/core/ipv6/nd6.c
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@ -693,7 +693,7 @@ nd6_input(struct pbuf *p, struct netif *inp)
} }
mtu_opt = (struct mtu_option *)buffer; mtu_opt = (struct mtu_option *)buffer;
mtu32 = lwip_htonl(mtu_opt->mtu); mtu32 = lwip_htonl(mtu_opt->mtu);
if ((mtu32 >= 1280) && (mtu32 <= 0xffff)) { if ((mtu32 >= IP6_MIN_MTU_LENGTH) && (mtu32 <= 0xffff)) {
#if LWIP_ND6_ALLOW_RA_UPDATES #if LWIP_ND6_ALLOW_RA_UPDATES
if (inp->mtu) { if (inp->mtu) {
/* don't set the mtu for IPv6 higher than the netif driver supports */ /* don't set the mtu for IPv6 higher than the netif driver supports */
@ -2312,7 +2312,7 @@ nd6_get_destination_mtu(const ip6_addr_t *ip6addr, struct netif *netif)
return netif_mtu6(netif); return netif_mtu6(netif);
} }
return 1280; /* Minimum MTU */ return IP6_MIN_MTU_LENGTH; /* Minimum MTU */
} }

2
src/include/lwip/prot/ip6.h
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@ -44,6 +44,8 @@
extern "C" { extern "C" {
#endif #endif
#define IP6_MIN_MTU_LENGTH 1280
/** This is the packed version of ip6_addr_t, /** This is the packed version of ip6_addr_t,
used in network headers that are itself packed */ used in network headers that are itself packed */
#ifdef PACK_STRUCT_USE_INCLUDES #ifdef PACK_STRUCT_USE_INCLUDES

2
src/netif/lowpan6.c
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@ -881,7 +881,7 @@ lowpan6_if_init(struct netif *netif)
MIB2_INIT_NETIF(netif, snmp_ifType_other, 0); MIB2_INIT_NETIF(netif, snmp_ifType_other, 0);
/* maximum transfer unit */ /* maximum transfer unit */
netif->mtu = 1280; netif->mtu = IP6_MIN_MTU_LENGTH;
/* broadcast capability */ /* broadcast capability */
netif->flags = NETIF_FLAG_BROADCAST /* | NETIF_FLAG_LOWPAN6 */; netif->flags = NETIF_FLAG_BROADCAST /* | NETIF_FLAG_LOWPAN6 */;

2
src/netif/lowpan6_ble.c
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@ -417,7 +417,7 @@ rfc7668_if_init(struct netif *netif)
MIB2_INIT_NETIF(netif, snmp_ifType_other, 0); MIB2_INIT_NETIF(netif, snmp_ifType_other, 0);
/* maximum transfer unit, set according to RFC7668 ch2.4 */ /* maximum transfer unit, set according to RFC7668 ch2.4 */
netif->mtu = 1280; netif->mtu = IP6_MIN_MTU_LENGTH;
/* no flags set (no broadcast, ethernet,...)*/ /* no flags set (no broadcast, ethernet,...)*/
netif->flags = 0; netif->flags = 0;