You can probably steal the code from slaacd(8). On 23 February 2024 20:58:59 CET, Claudio Jeker <cje...@diehard.n-r-g.com> wrote: >On Fri, Feb 23, 2024 at 06:25:18PM +0100, Denis Fondras wrote: >> Hello, >> >> I am trying to add IPv6 support for pppd(8) (IPv6CP) and I encounter a >> blocker >> when adding a default IPv6 route to PPP peer. >> >> Feb 23 17:26:45 rt-01 pppd[64071]: Couldn't add IPv6 default route: Network >> is unreachable >> >> Adding the default route from route(8) works when the connection is >> established. >> >> From what I see with route(8), it sends the same route message as pppd(8). >> >> From `route -v add -inet6 default fe80::ca4c:75ff:fe16:9f00%ppp0` : >> >> ``` >> RTM_ADD: Add Route: len 168, priority 0, table 0, if# 0, pid: 0, seq 1, >> errno 0 >> flags:<UP,GATEWAY> >> fmask: >> use: 0 mtu: 0 expire: 0 >> locks: inits: >> sockaddrs: <DST,GATEWAY,NETMASK> >> :: fe80::ca4c:75ff:fe16:9f00%ppp0 default >> ``` >> >> From pppd(8) : >> ``` >> got message of size 168 on Fri Feb 23 17:26:45 2024 >> RTM_ADD: Add Route: len 168, priority 0, table 0, if# 0, pid: 64071, seq 1, >> errno 51 >> flags:<UP,GATEWAY> >> fmask: >> use: 0 mtu: 0 expire: 0 >> locks: inits: >> sockaddrs: <DST,GATEWAY,NETMASK> >> :: fe80::ca4c:75ff:fe16:9f00%ppp0 default >> ``` >> >> However `route monitor -inet6` shows that the message is different when using >> route(8) : >> ``` >> got message of size 288 on Fri Feb 23 17:26:22 2024 >> RTM_ADD: Add Route: len 288, priority 56, table 0, if# 7, name ppp0, pid: >> 53003, seq 1, errno 0 >> flags:<UP,GATEWAY,DONE> >> fmask: >> use: 0 mtu: 0 expire: 0 >> locks: inits: >> sockaddrs: <DST,GATEWAY,NETMASK,IFP,IFA,BRD> >> :: fe80::ca4c:75ff:fe16:9f00%ppp0 :: ppp0 fe80::d925:b01f:db25:b020%ppp0 >> fe80::ca4c:75ff:fe16:9f00%ppp0 >> ``` >> >> Should I also send the IFP, IFA and BRD sockaddrs from pppd(8) ? > >Don't think so. > >> How comes message sent from route(8) have more attributes when received by >> monitor ? > >The kernel fills those in. > >Make sure you encode the IPv6 link local address correctly. The stupid >kame hack will hunt you.
-- Sent from a mobile device. Please excuse poor formatting.
