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pppd/ipv6cp: Add ipv6-pre-up script. #341

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pppd/ipv6cp: Add ipv6-pre-up script. #341

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Commits on Jun 1, 2022

  1. pppd/ipv6cp: Add ipv6-pre-up script. 

    This is required because either ipcp or ipv6cp can come up first, or as
the only protocol, and once IPv6 parameters has been established, there
are actions that may need to be executed prior to bringing the interface
up.

Prior to this we can have an execution order like:

pppd[26615]: Script /etc/ppp/ipv6-up started (pid 28183)
pppd[26615]: Script /etc/ppp/ip-pre-up started (pid 28186)
pppd[26615]: Script /etc/ppp/ip-pre-up finished (pid 28186), status = 0x0
pppd[26615]: Script /etc/ppp/ip-up started (pid 28238)
pppd[26615]: Script /etc/ppp/ipv6-up finished (pid 28183), status = 0x0
pppd[26615]: Script /etc/ppp/ip-up finished (pid 28238), status = 0x0

ip ad sh shows that during ip-pre-up the interface state was already up:

ppp-ip-pre-up(ppp1)[28208]: 423: ppp1: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1480 qdisc pfifo_fast state UNKNOWN group default qlen 3
ppp-ip-pre-up(ppp1)[28208]:     link/ppp
ppp-ip-pre-up(ppp1)[28208]:     inet 10.1.0.0 peer 192.168.50.0/32 scope global ppp1
ppp-ip-pre-up(ppp1)[28208]:        valid_lft forever preferred_lft forever
ulsdns_monitor[28216]: 192.168.50.0 dev ppp1 proto kernel scope link src 10.1.0.0
ppp-ip-pre-up(ppp1)[28208]:     inet6 fe80::b4a3:c896:22bc:151f peer fe80::6/128 scope link
ppp-ip-pre-up(ppp1)[28208]:        valid_lft forever preferred_lft forever

In order to make this work properly, a system admin would need to take
the same action from ip-up and ipv6-up (probably in a locked manner) if
and only if the interface oper status is down.

As things stand one cannot depende on ip-up being executed whilst
interface is still in down state, and as such, the scription in the man
page is wrong too.

Signed-off-by: Jaco Kroon <[email protected]>
    @jkroonza
    jkroonza committed Jun 1, 2022
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