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Merge pull request #1535 from zerotier/linux-route-metric

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Set a high metric on linux routes that have a via.
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Sean OMeara 2022-01-12 18:41:54 +01:00 • committed by GitHub
commit 0da00bf546
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1 changed files with 18 additions and 0 deletions
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18
osdep/LinuxNetLink.cpp
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@ -25,6 +25,7 @@
#ifndef IFNAMSIZ #ifndef IFNAMSIZ
#define IFNAMSIZ 16 #define IFNAMSIZ 16
#endif #endif
const int ZT_RTE_METRIC = 5000;
namespace ZeroTier { namespace ZeroTier {
@ -731,6 +732,23 @@ void LinuxNetLink::addRoute(const InetAddress &target, const InetAddress &via, c
rtl += rtap->rta_len; rtl += rtap->rta_len;
if(via) { if(via) {
/*
* Setting a metric keeps zerotier routes from taking priority over physical
* At best the computer would use zerotier through the router instead of the LAN.
* At worst it stops working at all.
*
* default via 192.168.82.1 dev eth0 proto dhcp src 192.168.82.169 metric 202
* 10.147.17.0/24 dev zt5u4uptmb proto kernel scope link src 10.147.17.94
* 192.168.82.0/24 dev eth0 proto dhcp scope link src 192.168.82.169 metric 202
* 192.168.82.0/24 via 10.147.17.1 dev zt5u4uptmb proto static metric 5000
*
*/
rtap = (struct rtattr*)(((char*)rtap) + rtap->rta_len);
rtap->rta_type = RTA_PRIORITY;
rtap->rta_len = RTA_LENGTH(sizeof(ZT_RTE_METRIC));
memcpy(RTA_DATA(rtap), &ZT_RTE_METRIC, sizeof(ZT_RTE_METRIC));
rtl += rtap->rta_len;
rtap = (struct rtattr *)(((char*)rtap)+rtap->rta_len); rtap = (struct rtattr *)(((char*)rtap)+rtap->rta_len);
rtap->rta_type = RTA_GATEWAY; rtap->rta_type = RTA_GATEWAY;
if(via.isV4()) { if(via.isV4()) {