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dhcp: add code comment to lease_parse_routes()

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Thomas Haller 2022-04-04 09:56:19 +02:00
parent d1dfcc4c9d
commit 588ac2e2e4
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11
src/core/dhcp/nm-dhcp-nettools.c
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@ -343,6 +343,17 @@ lease_parse_routes(NDhcp4ClientLease *lease,
int r;
guint i;
/* Routes can be in option 33 (static-route), 121 (classless-static-route) and 249 (a non-standard classless-static-route).
* Option 249 (Microsoft Classless Static Route), is described here:
* https://docs.microsoft.com/en-us/openspecs/windows_protocols/ms-dhcpe/f9c19c79-1c7f-4746-b555-0c0fc523f3f9
*
* We will anyway parse all these 3 options and add them to the "options" hash (as distinct entries).
* We will however also parse one of the options into the "l3cd" for configuring routing.
* Thereby we prefer 121 over 249 over 33.
*
* Preferring 121 over 33 is defined by RFC 3443.
* Preferring 121 over 249 over 33 is made up as it makes sense (the MS docs are not very clear).
*/
for (i = 0; i < 2; i++) {
const guint8 option_code = (i == 0) ? NM_DHCP_OPTION_DHCP4_CLASSLESS_STATIC_ROUTE
: NM_DHCP_OPTION_DHCP4_PRIVATE_CLASSLESS_STATIC_ROUTE;