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From f2cb0f1570ca603c5d92d6a7d87596d07fdb01cd Mon Sep 17 00:00:00 2001
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Message-Id: <f2cb0f1570ca603c5d92d6a7d87596d07fdb01cd.1612868485.git.aclaudi@redhat.com>
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In-Reply-To: <cb7ce51cc1abd7b98370b903ec96205ebfe48661.1612868485.git.aclaudi@redhat.com>
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References: <cb7ce51cc1abd7b98370b903ec96205ebfe48661.1612868485.git.aclaudi@redhat.com>
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From: Andrea Claudi <aclaudi@redhat.com>
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Date: Tue, 9 Feb 2021 12:00:58 +0100
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Subject: [PATCH] iproute: force rtm_dst_len to 32/128
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1852038
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Upstream Status: unknown commit 5a37254b
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commit 5a37254b71249bfb73d44d6278d767a6b127a2f9
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Author: Luca Boccassi <bluca@debian.org>
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Date: Sun Jan 24 17:36:58 2021 +0000
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iproute: force rtm_dst_len to 32/128
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Since NETLINK_GET_STRICT_CHK was enabled, the kernel rejects commands
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that pass a prefix length, eg:
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ip route get `1.0.0.0/1
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Error: ipv4: Invalid values in header for route get request.
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ip route get 0.0.0.0/0
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Error: ipv4: rtm_src_len and rtm_dst_len must be 32 for IPv4
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Since there's no point in setting a rtm_dst_len that we know is going
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to be rejected, just force it to the right value if it's passed on
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the command line. Print a warning to stderr to notify users.
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Bug-Debian: https://bugs.debian.org/944730
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Reported-By: Clément 'wxcafé' Hertling <wxcafe@wxcafe.net>
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Signed-off-by: Luca Boccassi <bluca@debian.org>
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Signed-off-by: Stephen Hemminger <stephen@networkplumber.org>
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---
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ip/iproute.c | 13 ++++++++++++-
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1 file changed, 12 insertions(+), 1 deletion(-)
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diff --git a/ip/iproute.c b/ip/iproute.c
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index 05ec2c29..1f3c347e 100644
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--- a/ip/iproute.c
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+++ b/ip/iproute.c
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@@ -2067,7 +2067,18 @@ static int iproute_get(int argc, char **argv)
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if (addr.bytelen)
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addattr_l(&req.n, sizeof(req),
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RTA_DST, &addr.data, addr.bytelen);
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- req.r.rtm_dst_len = addr.bitlen;
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+ if (req.r.rtm_family == AF_INET && addr.bitlen != 32) {
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+ fprintf(stderr,
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+ "Warning: /%u as prefix is invalid, only /32 (or none) is supported.\n",
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+ addr.bitlen);
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+ req.r.rtm_dst_len = 32;
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+ } else if (req.r.rtm_family == AF_INET6 && addr.bitlen != 128) {
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+ fprintf(stderr,
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+ "Warning: /%u as prefix is invalid, only /128 (or none) is supported.\n",
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+ addr.bitlen);
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+ req.r.rtm_dst_len = 128;
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+ } else
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+ req.r.rtm_dst_len = addr.bitlen;
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address_found = true;
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}
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argc--; argv++;
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--
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2.29.2
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