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net: sched: em_ipt: set the family based on the packet if it's unspecified

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Set the family based on the packet if it's unspecified otherwise
protocol-neutral matches will have wrong information (e.g. NFPROTO_UNSPEC).
In preparation for using NFPROTO_UNSPEC xt matches.

v2: set the nfproto only when unspecified

Suggested-by: Eyal Birger <eyal.birger@gmail.com>
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 11:10:45 +03:00 committed by David S. Miller
parent 9e10edd7dc
commit f4c1c40c35
1 changed files with 6 additions and 1 deletions
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7
net/sched/em_ipt.c
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@ -182,6 +182,7 @@ static int em_ipt_match(struct sk_buff *skb, struct tcf_ematch *em,
const struct em_ipt_match *im = (const void *)em->data;
struct xt_action_param acpar = {};
struct net_device *indev = NULL;
u8 nfproto = im->match->family;
struct nf_hook_state state;
int ret;
@ -189,10 +190,14 @@ static int em_ipt_match(struct sk_buff *skb, struct tcf_ematch *em,
case htons(ETH_P_IP):
if (!pskb_network_may_pull(skb, sizeof(struct iphdr)))
return 0;
if (nfproto == NFPROTO_UNSPEC)
nfproto = NFPROTO_IPV4;
break;
case htons(ETH_P_IPV6):
if (!pskb_network_may_pull(skb, sizeof(struct ipv6hdr)))
return 0;
if (nfproto == NFPROTO_UNSPEC)
nfproto = NFPROTO_IPV6;
break;
default:
return 0;
@ -203,7 +208,7 @@ static int em_ipt_match(struct sk_buff *skb, struct tcf_ematch *em,
if (skb->skb_iif)
indev = dev_get_by_index_rcu(em->net, skb->skb_iif);
nf_hook_state_init(&state, im->hook, im->match->family,
nf_hook_state_init(&state, im->hook, nfproto,
indev ?: skb->dev, skb->dev, NULL, em->net, NULL);
acpar.match = im->match;