// SPDX-License-Identifier: GPL-2.0
/*
* Management Component Transport Protocol (MCTP) - routing
* implementation.
*
* This is currently based on a simple routing table, with no dst cache. The
* number of routes should stay fairly small, so the lookup cost is small.
*
* Copyright (c) 2021 Code Construct
* Copyright (c) 2021 Google
*/
#include <linux/idr.h>
#include <linux/kconfig.h>
#include <linux/mctp.h>
#include <linux/netdevice.h>
#include <linux/rtnetlink.h>
#include <linux/skbuff.h>
#include <uapi/linux/if_arp.h>
#include <net/mctp.h>
#include <net/mctpdevice.h>
#include <net/netlink.h>
#include <net/sock.h>
#include <trace/events/mctp.h>
static const unsigned int mctp_message_maxlen = 64 * 1024;
static const unsigned long mctp_key_lifetime = 6 * CONFIG_HZ;
static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev);
/* route output callbacks */
static int mctp_route_discard(struct mctp_route *route, struct sk_buff *skb)
{
kfree_skb(skb);
return 0;
}
static struct mctp_sock *mctp_lookup_bind(struct net *net, struct sk_buff *skb)
{
struct mctp_skb_cb *cb = mctp_cb(skb);
struct mctp_hdr *mh;
struct sock *sk;
u8 type;
WARN_ON(!rcu_read_lock_held());
/* TODO: look up in skb->cb? */
mh = mctp_hdr(skb);
if (!skb_headlen(skb))
return NULL;
type = (*(u8 *)skb->data) & 0x7f;
sk_for_each_rcu(sk, &net->mctp.binds) {
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
if (msk->bind_net != MCTP_NET_ANY && msk->bind_net != cb->net)
continue;
if (msk->bind_type != type)
continue;
if (!mctp_address_matches(msk->bind_addr, mh->dest))
continue;
