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zebra: Use the kernel flags from the IFA_FLAGS if it is available

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The ifa_flags value in the netlink message was originally a uint8_t
value.  The linux kernel quickly ran out of 8 bits of data to
pass and the IFA_FLAGS value was added to the netlink message to allow
more than 8 bits of data to be passed.  So replace the ifa_flags
with the IFA_FLAGS value if it exists in the interface netlink
message.

Signed-off-by: Donald Sharp <sharpd@cumulusnetworks.com>
This commit is contained in:
Donald Sharp 2019-01-28 16:14:03 -05:00
parent b539a22f5a
commit 9254efede1
1 changed files with 10 additions and 3 deletions
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13
zebra/if_netlink.c
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@ -925,6 +925,7 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
char *label = NULL;
struct zebra_ns *zns;
uint32_t metric = METRIC_MAX;
uint32_t kernel_flags = 0;
zns = zebra_ns_lookup(ns_id);
ifa = NLMSG_DATA(h);
@ -961,12 +962,18 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
return -1;
}
/* Flags passed through */
if (tb[IFA_FLAGS])
kernel_flags = *(int *)RTA_DATA(tb[IFA_FLAGS]);
else
kernel_flags = ifa->ifa_flags;
if (IS_ZEBRA_DEBUG_KERNEL) /* remove this line to see initial ifcfg */
{
char buf[BUFSIZ];
zlog_debug("netlink_interface_addr %s %s flags 0x%x:",
nl_msg_type_to_str(h->nlmsg_type), ifp->name,
ifa->ifa_flags);
kernel_flags);
if (tb[IFA_LOCAL])
zlog_debug(" IFA_LOCAL %s/%d",
inet_ntop(ifa->ifa_family,
@ -1023,7 +1030,7 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
}
/* Flags. */
if (ifa->ifa_flags & IFA_F_SECONDARY)
if (kernel_flags & IFA_F_SECONDARY)
SET_FLAG(flags, ZEBRA_IFA_SECONDARY);
/* Label */
@ -1070,7 +1077,7 @@ int netlink_interface_addr(struct nlmsghdr *h, ns_id_t ns_id, int startup)
* time, Quagga
* does query for and will receive all addresses.
*/
if (!(ifa->ifa_flags
if (!(kernel_flags
& (IFA_F_DADFAILED | IFA_F_TENTATIVE)))
connected_add_ipv6(ifp, flags,
(struct in6_addr *)addr,