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gnrc_ipv6_netif: initialize MTU from device, if possible

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This commit is contained in:
Martine Lenders 2015-08-20 15:09:45 +02:00
parent 04e7a7e509
commit f1864fd2b6
3 changed files with 34 additions and 4 deletions
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17
sys/include/net/gnrc/ipv6/netif.h
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@ -28,6 +28,7 @@
#include "kernel_macros.h"
#include "kernel_types.h"
#include "mutex.h"
#include "net/ipv6.h"
#include "net/ipv6/addr.h"
#include "vtimer.h"
@ -51,11 +52,19 @@ extern "C" {
/**
* @brief Default MTU
*
* @see <a href="https://tools.ietf.org/html/rfc2460#section-5">
* RFC 2460, section 5
* </a>
* An interface will choose this MTU if the link-layer's maximum packet size
* (see @ref NETOPT_MAX_PACKET_SIZE) is lesser than the @ref IPV6_MIN_MTU or if it just not
* provide it. For RFC-compatible communication it must be at least @ref IPV6_MIN_MTU.
*
* @note If the scenario the node is used in allows for it and the packet size is predictable,
* a user might choose to set @ref GNRC_IPV6_NETIF_DEFAULT_MTU to a lesser value than
* @ref IPV6_MIN_MTU to optimize for code size (e.g. because it is then possible to omit
* @ref net_gnrc_sixlowpan_frag) and memory usage (e.g. because @ref GNRC_PKTBUF_SIZE
* can be much smaller).
*/
#define GNRC_IPV6_NETIF_DEFAULT_MTU (1280)
#ifndef GNRC_IPV6_NETIF_DEFAULT_MTU
#define GNRC_IPV6_NETIF_DEFAULT_MTU (IPV6_MIN_MTU)
#endif
/**
* @brief Default hop limit

9
sys/include/net/ipv6.h
View File

@ -32,6 +32,15 @@
extern "C" {
#endif
/**
* @brief minimum **M**aximum **T**ransition **U**nit
*
* @see <a href="https://tools.ietf.org/html/rfc4944#section-5.3">
* RFC 2460, section 5.3
* </a>
*/
#define IPV6_MIN_MTU (1280)
#ifdef __cplusplus
}
#endif

12
sys/net/gnrc/network_layer/ipv6/netif/gnrc_ipv6_netif.c
View File

@ -695,6 +695,7 @@ void gnrc_ipv6_netif_init_by_dev(void)
for (size_t i = 0; i < ifnum; i++) {
ipv6_addr_t addr;
eui64_t iid;
uint16_t mtu;
gnrc_ipv6_netif_t *ipv6_if = gnrc_ipv6_netif_get(ifs[i]);
if (ipv6_if == NULL) {
@ -730,6 +731,7 @@ void gnrc_ipv6_netif_init_by_dev(void)
}
#endif
/* set link-local address */
if ((gnrc_netapi_get(ifs[i], NETOPT_IPV6_IID, 0, &iid,
sizeof(eui64_t)) < 0)) {
mutex_unlock(&ipv6_if->mutex);
@ -740,6 +742,16 @@ void gnrc_ipv6_netif_init_by_dev(void)
ipv6_addr_set_link_local_prefix(&addr);
_add_addr_to_entry(ipv6_if, &addr, 64, 0);
/* set link MTU */
if ((gnrc_netapi_get(ifs[i], NETOPT_MAX_PACKET_SIZE, 0, &mtu,
sizeof(uint16_t)) >= 0)) {
if (mtu >= IPV6_MIN_MTU) {
ipv6_if->mtu = mtu;
}
/* otherwise leave at GNRC_IPV6_NETIF_DEFAULT_MTU as initialized in
* gnrc_ipv6_netif_add() */
}
mutex_unlock(&ipv6_if->mutex);
}
}