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net: ipv4_fragment: Add PMTU support

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If PMTU is enabled, then use the MTU value from it instead of always
using network interface MTU.

Signed-off-by: Jukka Rissanen <jukka.rissanen@nordicsemi.no>
This commit is contained in:
Jukka Rissanen 2024-11-13 10:38:13 +02:00 • committed by Anas Nashif
commit b6618e8a53
1 changed files with 19 additions and 2 deletions
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21
subsys/net/ip/ipv4_fragment.c
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@ -23,6 +23,7 @@ LOG_MODULE_DECLARE(net_ipv4, CONFIG_NET_IPV4_LOG_LEVEL);
#include "ipv4.h"
#include "route.h"
#include "net_stats.h"
#include "pmtu.h"
/* Timeout for various buffer allocations in this file. */
#define NET_BUF_TIMEOUT K_MSEC(100)
@ -624,10 +625,26 @@ enum net_verdict net_ipv4_prepare_for_send_fragment(struct net_pkt *pkt)
* and we can skip other checks.
*/
if (ip_hdr->id[0] == 0 && ip_hdr->id[1] == 0) {
uint16_t mtu = net_if_get_mtu(net_pkt_iface(pkt));
size_t pkt_len = net_pkt_get_len(pkt);
uint16_t mtu;
mtu = MAX(NET_IPV4_MTU, mtu);
if (IS_ENABLED(CONFIG_NET_IPV4_PMTU)) {
struct sockaddr_in dst = {
.sin_family = AF_INET,
.sin_addr = *((struct in_addr *)ip_hdr->dst),
};
ret = net_pmtu_get_mtu((struct sockaddr *)&dst);
if (ret <= 0) {
goto use_interface_mtu;
}
mtu = ret;
} else {
use_interface_mtu:
mtu = net_if_get_mtu(net_pkt_iface(pkt));
mtu = MAX(NET_IPV4_MTU, mtu);
}
if (pkt_len > mtu) {
ret = net_ipv4_send_fragmented_pkt(net_pkt_iface(pkt), pkt, pkt_len, mtu);