63 lines
1.9 KiB
Diff
63 lines
1.9 KiB
Diff
From 45e441ada6d3ea4355d623cf12d9a559a5c2afde Mon Sep 17 00:00:00 2001
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From: Roy Marples <roy@marples.name>
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Date: Tue, 23 May 2023 22:14:57 +0100
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Subject: [PATCH] Linux: Improve learning IPv6 address flags
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Rather than matching addresses during netlink message processing,
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extract the local, address and flag parts.
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Once done, then match local and address to the address we are
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looking for and if equal apply the flags.
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Fixes #201 and maybe #149.
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---
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src/if-linux.c | 24 +++++++++++++++++-------
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1 file changed, 17 insertions(+), 7 deletions(-)
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diff --git a/src/if-linux.c b/src/if-linux.c
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index f2f609ed..212ed5df 100644
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--- a/src/if-linux.c
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+++ b/src/if-linux.c
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@@ -1996,7 +1996,8 @@ _if_addrflags6(__unused struct dhcpcd_ctx *ctx,
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size_t len;
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struct rtattr *rta;
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struct ifaddrmsg *ifa;
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- bool matches_addr = false;
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+ struct in6_addr *local = NULL, *address = NULL;
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+ uint32_t *flags = NULL;
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ifa = NLMSG_DATA(nlm);
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if (ifa->ifa_index != ia->ifa_ifindex || ifa->ifa_family != AF_INET6)
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@@ -2007,17 +2008,26 @@ _if_addrflags6(__unused struct dhcpcd_ctx *ctx,
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for (; RTA_OK(rta, len); rta = RTA_NEXT(rta, len)) {
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switch (rta->rta_type) {
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case IFA_ADDRESS:
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- if (IN6_ARE_ADDR_EQUAL(&ia->ifa_addr, (struct in6_addr *)RTA_DATA(rta)))
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- ia->ifa_found = matches_addr = true;
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- else
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- matches_addr = false;
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+ address = (struct in6_addr *)RTA_DATA(rta);
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+ break;
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+ case IFA_LOCAL:
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+ local = (struct in6_addr *)RTA_DATA(rta);
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break;
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case IFA_FLAGS:
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- if (matches_addr)
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- memcpy(&ia->ifa_flags, RTA_DATA(rta), sizeof(ia->ifa_flags));
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+ flags = (uint32_t *)RTA_DATA(rta);
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break;
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}
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}
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+
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+ if (local) {
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+ if (IN6_ARE_ADDR_EQUAL(&ia->ifa_addr, local))
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+ ia->ifa_found = true;
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+ } else if (address) {
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+ if (IN6_ARE_ADDR_EQUAL(&ia->ifa_addr, address))
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+ ia->ifa_found = true;
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+ }
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+ if (flags && ia->ifa_found)
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+ memcpy(&ia->ifa_flags, flags, sizeof(ia->ifa_flags));
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return 0;
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}
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