From: Susant Sahani Date: Thu, 9 May 2019 07:35:35 +0530 Subject: networkd: fix link_up() (#12505) Fillup IFLA_INET6_ADDR_GEN_MODE while we do link_up. Fixes the following error: ``` dummy-test: Could not bring up interface: Invalid argument ``` After reading the kernel code when we do a link up ``` net/core/rtnetlink.c IFLA_AF_SPEC af_ops->set_link_af(dev, af); inet6_set_link_af if (tb[IFLA_INET6_ADDR_GEN_MODE]) Here it looks for IFLA_INET6_ADDR_GEN_MODE ``` Since link up we didn't filling up that it's failing. Closes #12504. (cherry picked from commit 4eb086a38712ea98faf41e075b84555b11b54362) --- src/network/networkd-link.c | 15 +++++++++++++++ 1 file changed, 15 insertions(+) diff --git a/src/network/networkd-link.c b/src/network/networkd-link.c index 3cfdf4a..6445b94 100644 --- a/src/network/networkd-link.c +++ b/src/network/networkd-link.c @@ -1918,6 +1918,8 @@ static int link_up(Link *link) { } if (link_ipv6_enabled(link)) { + uint8_t ipv6ll_mode; + r = sd_netlink_message_open_container(req, IFLA_AF_SPEC); if (r < 0) return log_link_error_errno(link, r, "Could not open IFLA_AF_SPEC container: %m"); @@ -1933,6 +1935,19 @@ static int link_up(Link *link) { return log_link_error_errno(link, r, "Could not append IFLA_INET6_TOKEN: %m"); } + if (!link_ipv6ll_enabled(link)) + ipv6ll_mode = IN6_ADDR_GEN_MODE_NONE; + else if (sysctl_read_ip_property(AF_INET6, link->ifname, "stable_secret", NULL) < 0) + /* The file may not exist. And event if it exists, when stable_secret is unset, + * reading the file fails with EIO. */ + ipv6ll_mode = IN6_ADDR_GEN_MODE_EUI64; + else + ipv6ll_mode = IN6_ADDR_GEN_MODE_STABLE_PRIVACY; + + r = sd_netlink_message_append_u8(req, IFLA_INET6_ADDR_GEN_MODE, ipv6ll_mode); + if (r < 0) + return log_link_error_errno(link, r, "Could not append IFLA_INET6_ADDR_GEN_MODE: %m"); + r = sd_netlink_message_close_container(req); if (r < 0) return log_link_error_errno(link, r, "Could not close AF_INET6 container: %m");