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| author | David Ahern <dsahern@gmail.com> | 2018-10-09 21:10:43 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-10-11 08:46:17 +0300 |
| commit | d8a66aa25405e4e3015e4e4e856ef716585d59df (patch) | |
| tree | d4ff82d1d4562212944cd77b85f5207b08f830df /net/mpls | |
| parent | 83b59b46c8efe35756cdbf7f520728d4bb95f9a6 (diff) | |
| download | linux-d8a66aa25405e4e3015e4e4e856ef716585d59df.tar.xz | |
net/mpls: Implement handler for strict data checking on dumps
Without CONFIG_INET enabled compiles fail with:
net/mpls/af_mpls.o: In function `mpls_dump_routes':
af_mpls.c:(.text+0xed0): undefined reference to `ip_valid_fib_dump_req'
The preference is for MPLS to use the same handler as ipv4 and ipv6
to allow consistency when doing a dump for AF_UNSPEC which walks
all address families invoking the route dump handler. If INET is
disabled then fallback to an MPLS version which can be tighter on
the data checks.
Fixes: e8ba330ac0c5 ("rtnetlink: Update fib dumps for strict data checking")
Reported-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: David Ahern <dsahern@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/mpls')
| -rw-r--r-- | net/mpls/af_mpls.c | 36 |
1 files changed, 35 insertions, 1 deletions
diff --git a/net/mpls/af_mpls.c b/net/mpls/af_mpls.c index 7f891ffffc05..5fe274c47c41 100644 --- a/net/mpls/af_mpls.c +++ b/net/mpls/af_mpls.c @@ -2031,6 +2031,40 @@ nla_put_failure: return -EMSGSIZE; } +#if IS_ENABLED(CONFIG_INET) +static int mpls_valid_fib_dump_req(const struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + return ip_valid_fib_dump_req(nlh, extack); +} +#else +static int mpls_valid_fib_dump_req(const struct nlmsghdr *nlh, + struct netlink_ext_ack *extack) +{ + struct rtmsg *rtm; + + if (nlh->nlmsg_len < nlmsg_msg_size(sizeof(*rtm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid header for FIB dump request"); + return -EINVAL; + } + + rtm = nlmsg_data(nlh); + if (rtm->rtm_dst_len || rtm->rtm_src_len || rtm->rtm_tos || + rtm->rtm_table || rtm->rtm_protocol || rtm->rtm_scope || + rtm->rtm_type || rtm->rtm_flags) { + NL_SET_ERR_MSG_MOD(extack, "Invalid values in header for FIB dump request"); + return -EINVAL; + } + + if (nlmsg_attrlen(nlh, sizeof(*rtm))) { + NL_SET_ERR_MSG_MOD(extack, "Invalid data after header in FIB dump request"); + return -EINVAL; + } + + return 0; +} +#endif + static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) { const struct nlmsghdr *nlh = cb->nlh; @@ -2042,7 +2076,7 @@ static int mpls_dump_routes(struct sk_buff *skb, struct netlink_callback *cb) ASSERT_RTNL(); if (cb->strict_check) { - int err = ip_valid_fib_dump_req(nlh, cb->extack); + int err = mpls_valid_fib_dump_req(nlh, cb->extack); if (err < 0) return err; |