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Merge pull request #7987 from donaldsharp/eigrp_mtu_correct 

eigrpd: Correctly set the mtu for eigrp packets sent
This commit is contained in:
Russ White 2021-02-02 07:31:55 -05:00 committed by GitHub
parent a67b8731d2 7c6ff2c54f
commit b449f7dc10
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GPG Key ID: 4AEE18F83AFDEB23
2 changed files with 16 additions and 4 deletions
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18
eigrpd/eigrp_interface.c
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@ -229,6 +229,20 @@ void eigrp_del_if_params(struct eigrp_if_params *eip)
free(eip->auth_keychain);
}
/*
* Set the network byte order of the 3 bytes we send
* of the mtu of the link.
*/
static void eigrp_mtu_convert(struct eigrp_metrics *metric, uint32_t host_mtu)
{
uint32_t network_mtu = htonl(host_mtu);
uint8_t *nm = (uint8_t *)&network_mtu;
metric->mtu[0] = nm[1];
metric->mtu[1] = nm[2];
metric->mtu[2] = nm[3];
}
int eigrp_if_up(struct eigrp_interface *ei)
{
struct eigrp_prefix_descriptor *pe;
@ -256,9 +270,7 @@ int eigrp_if_up(struct eigrp_interface *ei)
metric.delay = eigrp_delay_to_scaled(ei->params.delay);
metric.load = ei->params.load;
metric.reliability = ei->params.reliability;
metric.mtu[0] = 0xDC;
metric.mtu[1] = 0x05;
metric.mtu[2] = 0x00;
eigrp_mtu_convert(&metric, ei->ifp->mtu);
metric.hop_count = 0;
metric.flags = 0;
metric.tag = 0;

2
eigrpd/eigrp_structs.h
View File

@ -40,7 +40,7 @@
struct eigrp_metrics {
uint32_t delay;
uint32_t bandwidth;
unsigned char mtu[3];
uint8_t mtu[3];
uint8_t hop_count;
uint8_t reliability;
uint8_t load;