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net/sched: flower: Ensure both minimum and maximum ports are specified

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The kernel does not currently validate that both the minimum and maximum
ports of a port range are specified. This can lead user space to think
that a filter matching on a port range was successfully added, when in
fact it was not. For example, with a patched (buggy) iproute2 that only
sends the minimum port, the following commands do not return an error:

 # tc filter add dev swp1 ingress pref 1 proto ip flower ip_proto udp src_port 100-200 action pass

 # tc filter add dev swp1 ingress pref 1 proto ip flower ip_proto udp dst_port 100-200 action pass

 # tc filter show dev swp1 ingress
 filter protocol ip pref 1 flower chain 0
 filter protocol ip pref 1 flower chain 0 handle 0x1
   eth_type ipv4
   ip_proto udp
   not_in_hw
         action order 1: gact action pass
          random type none pass val 0
          index 1 ref 1 bind 1

 filter protocol ip pref 1 flower chain 0 handle 0x2
   eth_type ipv4
   ip_proto udp
   not_in_hw
         action order 1: gact action pass
          random type none pass val 0
          index 2 ref 1 bind 1

Fix by returning an error unless both ports are specified:

 # tc filter add dev swp1 ingress pref 1 proto ip flower ip_proto udp src_port 100-200 action pass
 Error: Both min and max source ports must be specified.
 We have an error talking to the kernel

 # tc filter add dev swp1 ingress pref 1 proto ip flower ip_proto udp dst_port 100-200 action pass
 Error: Both min and max destination ports must be specified.
 We have an error talking to the kernel

Fixes: 5c72299fba9d ("net: sched: cls_flower: Classify packets using port ranges")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Petr Machata <petrm@nvidia.com>
Acked-by: Jamal Hadi Salim <jhs@mojatatu.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ido Schimmel 2023-07-11 10:08:09 +03:00 committed by David S. Miller
parent b6c9ebde5a
commit d3f87278bc
1 changed files with 10 additions and 0 deletions
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10
net/sched/cls_flower.c
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@ -812,6 +812,16 @@ static int fl_set_key_port_range(struct nlattr **tb, struct fl_flow_key *key,
TCA_FLOWER_KEY_PORT_SRC_MAX, &mask->tp_range.tp_max.src,
TCA_FLOWER_UNSPEC, sizeof(key->tp_range.tp_max.src));
if (mask->tp_range.tp_min.dst != mask->tp_range.tp_max.dst) {
NL_SET_ERR_MSG(extack,
"Both min and max destination ports must be specified");
return -EINVAL;
}
if (mask->tp_range.tp_min.src != mask->tp_range.tp_max.src) {
NL_SET_ERR_MSG(extack,
"Both min and max source ports must be specified");
return -EINVAL;
}
if (mask->tp_range.tp_min.dst && mask->tp_range.tp_max.dst &&
ntohs(key->tp_range.tp_max.dst) <=
ntohs(key->tp_range.tp_min.dst)) {