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net: introduce a network packet filter framework

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This provides the infrastructure to create network packet filter rules
and to apply them to the RX and TX packet paths. Rules are made of
simple condition tests that can be linked together, creating a facility
similarly to the Linux iptables functionality.

A couple of generic and Ethernet-specific condition tests are also
provided.

Additional tests can be easily created on top of this.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
This commit is contained in:
Nicolas Pitre 2021-08-02 15:43:32 -04:00 • committed by Carles Cufí
commit faa0b2a848
17 changed files with 1186 additions and 1 deletions
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6
subsys/net/ip/net_if.c
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@ -333,6 +333,12 @@ void net_process_tx_packet(struct net_pkt *pkt)
void net_if_queue_tx(struct net_if *iface, struct net_pkt *pkt)
{
if (!net_pkt_filter_send_ok(pkt)) {
/* silently drop the packet */
net_pkt_unref(pkt);
return;
}
uint8_t prio = net_pkt_priority(pkt);
uint8_t tc = net_tx_priority2tc(prio);