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net: sched: em_ipt: keep the user-specified nfproto and dump it

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If we dump NFPROTO_UNSPEC as nfproto user-space libxtables can't handle
it and would exit with an error like:
"libxtables: unhandled NFPROTO in xtables_set_nfproto"
In order to avoid the error return the user-specified nfproto. If we
don't record it then the match family is used which can be
NFPROTO_UNSPEC. Even if we add support to mask NFPROTO_UNSPEC in
iproute2 we have to be compatible with older versions which would be
also be allowed to add NFPROTO_UNSPEC matches (e.g. addrtype after the
last patch).

v3: don't use the user nfproto for matching, only for dumping the rule,
    also don't allow the nfproto to be unspecified (explained above)
v2: adjust changes to missing patch, was patch 04 in v1

Signed-off-by: Nikolay Aleksandrov <nikolay@cumulusnetworks.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Nikolay Aleksandrov 2019-06-27 11:10:46 +03:00 committed by David S. Miller
parent f4c1c40c35
commit ba3d24d48f
1 changed files with 13 additions and 1 deletions
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14
net/sched/em_ipt.c
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@ -21,6 +21,7 @@
struct em_ipt_match {
const struct xt_match *match;
u32 hook;
u8 nfproto;
u8 match_data[0] __aligned(8);
};
@ -115,6 +116,7 @@ static int em_ipt_change(struct net *net, void *data, int data_len,
struct em_ipt_match *im = NULL;
struct xt_match *match;
int mdata_len, ret;
u8 nfproto;
ret = nla_parse_deprecated(tb, TCA_EM_IPT_MAX, data, data_len,
em_ipt_policy, NULL);
@ -125,6 +127,15 @@ static int em_ipt_change(struct net *net, void *data, int data_len,
!tb[TCA_EM_IPT_MATCH_DATA] || !tb[TCA_EM_IPT_NFPROTO])
return -EINVAL;
nfproto = nla_get_u8(tb[TCA_EM_IPT_NFPROTO]);
switch (nfproto) {
case NFPROTO_IPV4:
case NFPROTO_IPV6:
break;
default:
return -EINVAL;
}
match = get_xt_match(tb);
if (IS_ERR(match)) {
pr_err("unable to load match\n");
@ -140,6 +151,7 @@ static int em_ipt_change(struct net *net, void *data, int data_len,
im->match = match;
im->hook = nla_get_u32(tb[TCA_EM_IPT_HOOK]);
im->nfproto = nfproto;
nla_memcpy(im->match_data, tb[TCA_EM_IPT_MATCH_DATA], mdata_len);
ret = check_match(net, im, mdata_len);
@ -231,7 +243,7 @@ static int em_ipt_dump(struct sk_buff *skb, struct tcf_ematch *em)
return -EMSGSIZE;
if (nla_put_u8(skb, TCA_EM_IPT_MATCH_REVISION, im->match->revision) < 0)
return -EMSGSIZE;
if (nla_put_u8(skb, TCA_EM_IPT_NFPROTO, im->match->family) < 0)
if (nla_put_u8(skb, TCA_EM_IPT_NFPROTO, im->nfproto) < 0)
return -EMSGSIZE;
if (nla_put(skb, TCA_EM_IPT_MATCH_DATA,
im->match->usersize ?: im->match->matchsize,