mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-10-30 16:07:39 +00:00
fc993be36f
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
1340 lines
29 KiB
C
1340 lines
29 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Management Component Transport Protocol (MCTP) - routing
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* implementation.
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*
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* This is currently based on a simple routing table, with no dst cache. The
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* number of routes should stay fairly small, so the lookup cost is small.
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*
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* Copyright (c) 2021 Code Construct
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* Copyright (c) 2021 Google
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*/
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#include <linux/idr.h>
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#include <linux/kconfig.h>
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#include <linux/mctp.h>
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#include <linux/netdevice.h>
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#include <linux/rtnetlink.h>
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#include <linux/skbuff.h>
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#include <uapi/linux/if_arp.h>
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#include <net/mctp.h>
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#include <net/mctpdevice.h>
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#include <net/netlink.h>
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#include <net/sock.h>
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#include <trace/events/mctp.h>
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static const unsigned int mctp_message_maxlen = 64 * 1024;
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static const unsigned long mctp_key_lifetime = 6 * CONFIG_HZ;
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static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev);
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/* route output callbacks */
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static int mctp_route_discard(struct mctp_route *route, struct sk_buff *skb)
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{
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kfree_skb(skb);
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return 0;
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}
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static struct mctp_sock *mctp_lookup_bind(struct net *net, struct sk_buff *skb)
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{
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struct mctp_skb_cb *cb = mctp_cb(skb);
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struct mctp_hdr *mh;
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struct sock *sk;
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u8 type;
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WARN_ON(!rcu_read_lock_held());
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/* TODO: look up in skb->cb? */
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mh = mctp_hdr(skb);
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if (!skb_headlen(skb))
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return NULL;
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type = (*(u8 *)skb->data) & 0x7f;
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sk_for_each_rcu(sk, &net->mctp.binds) {
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struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
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if (msk->bind_net != MCTP_NET_ANY && msk->bind_net != cb->net)
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continue;
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if (msk->bind_type != type)
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continue;
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if (msk->bind_addr != MCTP_ADDR_ANY &&
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msk->bind_addr != mh->dest)
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continue;
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return msk;
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}
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return NULL;
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}
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static bool mctp_key_match(struct mctp_sk_key *key, mctp_eid_t local,
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mctp_eid_t peer, u8 tag)
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{
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if (key->local_addr != local)
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return false;
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if (key->peer_addr != peer)
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return false;
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if (key->tag != tag)
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return false;
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return true;
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}
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/* returns a key (with key->lock held, and refcounted), or NULL if no such
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* key exists.
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*/
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static struct mctp_sk_key *mctp_lookup_key(struct net *net, struct sk_buff *skb,
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mctp_eid_t peer,
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unsigned long *irqflags)
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__acquires(&key->lock)
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{
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struct mctp_sk_key *key, *ret;
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unsigned long flags;
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struct mctp_hdr *mh;
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u8 tag;
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mh = mctp_hdr(skb);
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tag = mh->flags_seq_tag & (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
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ret = NULL;
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spin_lock_irqsave(&net->mctp.keys_lock, flags);
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hlist_for_each_entry(key, &net->mctp.keys, hlist) {
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if (!mctp_key_match(key, mh->dest, peer, tag))
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continue;
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spin_lock(&key->lock);
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if (key->valid) {
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refcount_inc(&key->refs);
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ret = key;
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break;
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}
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spin_unlock(&key->lock);
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}
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if (ret) {
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spin_unlock(&net->mctp.keys_lock);
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*irqflags = flags;
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} else {
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spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
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}
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return ret;
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}
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static struct mctp_sk_key *mctp_key_alloc(struct mctp_sock *msk,
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mctp_eid_t local, mctp_eid_t peer,
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u8 tag, gfp_t gfp)
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{
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struct mctp_sk_key *key;
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key = kzalloc(sizeof(*key), gfp);
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if (!key)
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return NULL;
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key->peer_addr = peer;
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key->local_addr = local;
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key->tag = tag;
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key->sk = &msk->sk;
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key->valid = true;
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spin_lock_init(&key->lock);
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refcount_set(&key->refs, 1);
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return key;
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}
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void mctp_key_unref(struct mctp_sk_key *key)
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{
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unsigned long flags;
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if (!refcount_dec_and_test(&key->refs))
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return;
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/* even though no refs exist here, the lock allows us to stay
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* consistent with the locking requirement of mctp_dev_release_key
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*/
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spin_lock_irqsave(&key->lock, flags);
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mctp_dev_release_key(key->dev, key);
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spin_unlock_irqrestore(&key->lock, flags);
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kfree(key);
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}
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static int mctp_key_add(struct mctp_sk_key *key, struct mctp_sock *msk)
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{
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struct net *net = sock_net(&msk->sk);
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struct mctp_sk_key *tmp;
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unsigned long flags;
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int rc = 0;
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spin_lock_irqsave(&net->mctp.keys_lock, flags);
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hlist_for_each_entry(tmp, &net->mctp.keys, hlist) {
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if (mctp_key_match(tmp, key->local_addr, key->peer_addr,
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key->tag)) {
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spin_lock(&tmp->lock);
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if (tmp->valid)
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rc = -EEXIST;
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spin_unlock(&tmp->lock);
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if (rc)
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break;
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}
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}
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if (!rc) {
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refcount_inc(&key->refs);
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key->expiry = jiffies + mctp_key_lifetime;
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timer_reduce(&msk->key_expiry, key->expiry);
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hlist_add_head(&key->hlist, &net->mctp.keys);
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hlist_add_head(&key->sklist, &msk->keys);
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}
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spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
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return rc;
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}
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/* We're done with the key; unset valid and remove from lists. There may still
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* be outstanding refs on the key though...
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*/
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static void __mctp_key_unlock_drop(struct mctp_sk_key *key, struct net *net,
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unsigned long flags)
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__releases(&key->lock)
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{
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struct sk_buff *skb;
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skb = key->reasm_head;
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key->reasm_head = NULL;
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key->reasm_dead = true;
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key->valid = false;
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mctp_dev_release_key(key->dev, key);
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spin_unlock_irqrestore(&key->lock, flags);
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spin_lock_irqsave(&net->mctp.keys_lock, flags);
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hlist_del(&key->hlist);
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hlist_del(&key->sklist);
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spin_unlock_irqrestore(&net->mctp.keys_lock, flags);
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/* one unref for the lists */
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mctp_key_unref(key);
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/* and one for the local reference */
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mctp_key_unref(key);
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kfree_skb(skb);
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}
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#ifdef CONFIG_MCTP_FLOWS
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static void mctp_skb_set_flow(struct sk_buff *skb, struct mctp_sk_key *key)
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{
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struct mctp_flow *flow;
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flow = skb_ext_add(skb, SKB_EXT_MCTP);
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if (!flow)
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return;
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refcount_inc(&key->refs);
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flow->key = key;
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}
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static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev)
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{
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struct mctp_sk_key *key;
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struct mctp_flow *flow;
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flow = skb_ext_find(skb, SKB_EXT_MCTP);
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if (!flow)
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return;
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key = flow->key;
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if (WARN_ON(key->dev && key->dev != dev))
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return;
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mctp_dev_set_key(dev, key);
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}
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#else
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static void mctp_skb_set_flow(struct sk_buff *skb, struct mctp_sk_key *key) {}
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static void mctp_flow_prepare_output(struct sk_buff *skb, struct mctp_dev *dev) {}
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#endif
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static int mctp_frag_queue(struct mctp_sk_key *key, struct sk_buff *skb)
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{
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struct mctp_hdr *hdr = mctp_hdr(skb);
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u8 exp_seq, this_seq;
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this_seq = (hdr->flags_seq_tag >> MCTP_HDR_SEQ_SHIFT)
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& MCTP_HDR_SEQ_MASK;
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if (!key->reasm_head) {
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key->reasm_head = skb;
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key->reasm_tailp = &(skb_shinfo(skb)->frag_list);
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key->last_seq = this_seq;
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return 0;
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}
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exp_seq = (key->last_seq + 1) & MCTP_HDR_SEQ_MASK;
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if (this_seq != exp_seq)
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return -EINVAL;
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if (key->reasm_head->len + skb->len > mctp_message_maxlen)
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return -EINVAL;
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skb->next = NULL;
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skb->sk = NULL;
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*key->reasm_tailp = skb;
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key->reasm_tailp = &skb->next;
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key->last_seq = this_seq;
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key->reasm_head->data_len += skb->len;
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key->reasm_head->len += skb->len;
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key->reasm_head->truesize += skb->truesize;
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return 0;
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}
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static int mctp_route_input(struct mctp_route *route, struct sk_buff *skb)
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{
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struct net *net = dev_net(skb->dev);
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struct mctp_sk_key *key;
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struct mctp_sock *msk;
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struct mctp_hdr *mh;
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unsigned long f;
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u8 tag, flags;
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int rc;
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msk = NULL;
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rc = -EINVAL;
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/* we may be receiving a locally-routed packet; drop source sk
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* accounting
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*/
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skb_orphan(skb);
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/* ensure we have enough data for a header and a type */
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if (skb->len < sizeof(struct mctp_hdr) + 1)
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goto out;
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/* grab header, advance data ptr */
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mh = mctp_hdr(skb);
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skb_pull(skb, sizeof(struct mctp_hdr));
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if (mh->ver != 1)
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goto out;
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flags = mh->flags_seq_tag & (MCTP_HDR_FLAG_SOM | MCTP_HDR_FLAG_EOM);
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tag = mh->flags_seq_tag & (MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
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rcu_read_lock();
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/* lookup socket / reasm context, exactly matching (src,dest,tag).
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* we hold a ref on the key, and key->lock held.
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*/
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key = mctp_lookup_key(net, skb, mh->src, &f);
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if (flags & MCTP_HDR_FLAG_SOM) {
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if (key) {
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msk = container_of(key->sk, struct mctp_sock, sk);
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} else {
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/* first response to a broadcast? do a more general
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* key lookup to find the socket, but don't use this
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* key for reassembly - we'll create a more specific
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* one for future packets if required (ie, !EOM).
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*/
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key = mctp_lookup_key(net, skb, MCTP_ADDR_ANY, &f);
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if (key) {
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msk = container_of(key->sk,
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struct mctp_sock, sk);
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spin_unlock_irqrestore(&key->lock, f);
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mctp_key_unref(key);
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key = NULL;
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}
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}
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if (!key && !msk && (tag & MCTP_HDR_FLAG_TO))
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msk = mctp_lookup_bind(net, skb);
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if (!msk) {
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rc = -ENOENT;
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goto out_unlock;
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}
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/* single-packet message? deliver to socket, clean up any
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* pending key.
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*/
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if (flags & MCTP_HDR_FLAG_EOM) {
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sock_queue_rcv_skb(&msk->sk, skb);
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if (key) {
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/* we've hit a pending reassembly; not much we
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* can do but drop it
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*/
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trace_mctp_key_release(key,
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MCTP_TRACE_KEY_REPLIED);
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__mctp_key_unlock_drop(key, net, f);
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key = NULL;
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}
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rc = 0;
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goto out_unlock;
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}
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/* broadcast response or a bind() - create a key for further
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* packets for this message
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*/
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if (!key) {
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key = mctp_key_alloc(msk, mh->dest, mh->src,
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tag, GFP_ATOMIC);
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if (!key) {
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rc = -ENOMEM;
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goto out_unlock;
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}
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/* we can queue without the key lock here, as the
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* key isn't observable yet
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*/
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mctp_frag_queue(key, skb);
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/* if the key_add fails, we've raced with another
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* SOM packet with the same src, dest and tag. There's
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* no way to distinguish future packets, so all we
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* can do is drop; we'll free the skb on exit from
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* this function.
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*/
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rc = mctp_key_add(key, msk);
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if (rc)
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kfree(key);
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trace_mctp_key_acquire(key);
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/* we don't need to release key->lock on exit */
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mctp_key_unref(key);
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key = NULL;
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} else {
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if (key->reasm_head || key->reasm_dead) {
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/* duplicate start? drop everything */
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trace_mctp_key_release(key,
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MCTP_TRACE_KEY_INVALIDATED);
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__mctp_key_unlock_drop(key, net, f);
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rc = -EEXIST;
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key = NULL;
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} else {
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rc = mctp_frag_queue(key, skb);
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}
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}
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} else if (key) {
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/* this packet continues a previous message; reassemble
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* using the message-specific key
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*/
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/* we need to be continuing an existing reassembly... */
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if (!key->reasm_head)
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rc = -EINVAL;
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else
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rc = mctp_frag_queue(key, skb);
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/* end of message? deliver to socket, and we're done with
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* the reassembly/response key
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*/
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if (!rc && flags & MCTP_HDR_FLAG_EOM) {
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sock_queue_rcv_skb(key->sk, key->reasm_head);
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key->reasm_head = NULL;
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trace_mctp_key_release(key, MCTP_TRACE_KEY_REPLIED);
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__mctp_key_unlock_drop(key, net, f);
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key = NULL;
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}
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} else {
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/* not a start, no matching key */
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rc = -ENOENT;
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}
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out_unlock:
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rcu_read_unlock();
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if (key) {
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spin_unlock_irqrestore(&key->lock, f);
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mctp_key_unref(key);
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}
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out:
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if (rc)
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kfree_skb(skb);
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return rc;
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}
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|
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static unsigned int mctp_route_mtu(struct mctp_route *rt)
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{
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return rt->mtu ?: READ_ONCE(rt->dev->dev->mtu);
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}
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|
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static int mctp_route_output(struct mctp_route *route, struct sk_buff *skb)
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{
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struct mctp_skb_cb *cb = mctp_cb(skb);
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struct mctp_hdr *hdr = mctp_hdr(skb);
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char daddr_buf[MAX_ADDR_LEN];
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char *daddr = NULL;
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unsigned int mtu;
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int rc;
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skb->protocol = htons(ETH_P_MCTP);
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mtu = READ_ONCE(skb->dev->mtu);
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if (skb->len > mtu) {
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kfree_skb(skb);
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return -EMSGSIZE;
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}
|
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|
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if (cb->ifindex) {
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/* direct route; use the hwaddr we stashed in sendmsg */
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daddr = cb->haddr;
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} else {
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/* If lookup fails let the device handle daddr==NULL */
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if (mctp_neigh_lookup(route->dev, hdr->dest, daddr_buf) == 0)
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daddr = daddr_buf;
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}
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rc = dev_hard_header(skb, skb->dev, ntohs(skb->protocol),
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daddr, skb->dev->dev_addr, skb->len);
|
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if (rc) {
|
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kfree_skb(skb);
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return -EHOSTUNREACH;
|
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}
|
|
|
|
mctp_flow_prepare_output(skb, route->dev);
|
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|
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rc = dev_queue_xmit(skb);
|
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if (rc)
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rc = net_xmit_errno(rc);
|
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|
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return rc;
|
|
}
|
|
|
|
/* route alloc/release */
|
|
static void mctp_route_release(struct mctp_route *rt)
|
|
{
|
|
if (refcount_dec_and_test(&rt->refs)) {
|
|
mctp_dev_put(rt->dev);
|
|
kfree_rcu(rt, rcu);
|
|
}
|
|
}
|
|
|
|
/* returns a route with the refcount at 1 */
|
|
static struct mctp_route *mctp_route_alloc(void)
|
|
{
|
|
struct mctp_route *rt;
|
|
|
|
rt = kzalloc(sizeof(*rt), GFP_KERNEL);
|
|
if (!rt)
|
|
return NULL;
|
|
|
|
INIT_LIST_HEAD(&rt->list);
|
|
refcount_set(&rt->refs, 1);
|
|
rt->output = mctp_route_discard;
|
|
|
|
return rt;
|
|
}
|
|
|
|
unsigned int mctp_default_net(struct net *net)
|
|
{
|
|
return READ_ONCE(net->mctp.default_net);
|
|
}
|
|
|
|
int mctp_default_net_set(struct net *net, unsigned int index)
|
|
{
|
|
if (index == 0)
|
|
return -EINVAL;
|
|
WRITE_ONCE(net->mctp.default_net, index);
|
|
return 0;
|
|
}
|
|
|
|
/* tag management */
|
|
static void mctp_reserve_tag(struct net *net, struct mctp_sk_key *key,
|
|
struct mctp_sock *msk)
|
|
{
|
|
struct netns_mctp *mns = &net->mctp;
|
|
|
|
lockdep_assert_held(&mns->keys_lock);
|
|
|
|
key->expiry = jiffies + mctp_key_lifetime;
|
|
timer_reduce(&msk->key_expiry, key->expiry);
|
|
|
|
/* we hold the net->key_lock here, allowing updates to both
|
|
* then net and sk
|
|
*/
|
|
hlist_add_head_rcu(&key->hlist, &mns->keys);
|
|
hlist_add_head_rcu(&key->sklist, &msk->keys);
|
|
refcount_inc(&key->refs);
|
|
}
|
|
|
|
/* Allocate a locally-owned tag value for (saddr, daddr), and reserve
|
|
* it for the socket msk
|
|
*/
|
|
static struct mctp_sk_key *mctp_alloc_local_tag(struct mctp_sock *msk,
|
|
mctp_eid_t saddr,
|
|
mctp_eid_t daddr, u8 *tagp)
|
|
{
|
|
struct net *net = sock_net(&msk->sk);
|
|
struct netns_mctp *mns = &net->mctp;
|
|
struct mctp_sk_key *key, *tmp;
|
|
unsigned long flags;
|
|
u8 tagbits;
|
|
|
|
/* for NULL destination EIDs, we may get a response from any peer */
|
|
if (daddr == MCTP_ADDR_NULL)
|
|
daddr = MCTP_ADDR_ANY;
|
|
|
|
/* be optimistic, alloc now */
|
|
key = mctp_key_alloc(msk, saddr, daddr, 0, GFP_KERNEL);
|
|
if (!key)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
/* 8 possible tag values */
|
|
tagbits = 0xff;
|
|
|
|
spin_lock_irqsave(&mns->keys_lock, flags);
|
|
|
|
/* Walk through the existing keys, looking for potential conflicting
|
|
* tags. If we find a conflict, clear that bit from tagbits
|
|
*/
|
|
hlist_for_each_entry(tmp, &mns->keys, hlist) {
|
|
/* We can check the lookup fields (*_addr, tag) without the
|
|
* lock held, they don't change over the lifetime of the key.
|
|
*/
|
|
|
|
/* if we don't own the tag, it can't conflict */
|
|
if (tmp->tag & MCTP_HDR_FLAG_TO)
|
|
continue;
|
|
|
|
if (!((tmp->peer_addr == daddr ||
|
|
tmp->peer_addr == MCTP_ADDR_ANY) &&
|
|
tmp->local_addr == saddr))
|
|
continue;
|
|
|
|
spin_lock(&tmp->lock);
|
|
/* key must still be valid. If we find a match, clear the
|
|
* potential tag value
|
|
*/
|
|
if (tmp->valid)
|
|
tagbits &= ~(1 << tmp->tag);
|
|
spin_unlock(&tmp->lock);
|
|
|
|
if (!tagbits)
|
|
break;
|
|
}
|
|
|
|
if (tagbits) {
|
|
key->tag = __ffs(tagbits);
|
|
mctp_reserve_tag(net, key, msk);
|
|
trace_mctp_key_acquire(key);
|
|
|
|
*tagp = key->tag;
|
|
}
|
|
|
|
spin_unlock_irqrestore(&mns->keys_lock, flags);
|
|
|
|
if (!tagbits) {
|
|
kfree(key);
|
|
return ERR_PTR(-EBUSY);
|
|
}
|
|
|
|
return key;
|
|
}
|
|
|
|
/* routing lookups */
|
|
static bool mctp_rt_match_eid(struct mctp_route *rt,
|
|
unsigned int net, mctp_eid_t eid)
|
|
{
|
|
return READ_ONCE(rt->dev->net) == net &&
|
|
rt->min <= eid && rt->max >= eid;
|
|
}
|
|
|
|
/* compares match, used for duplicate prevention */
|
|
static bool mctp_rt_compare_exact(struct mctp_route *rt1,
|
|
struct mctp_route *rt2)
|
|
{
|
|
ASSERT_RTNL();
|
|
return rt1->dev->net == rt2->dev->net &&
|
|
rt1->min == rt2->min &&
|
|
rt1->max == rt2->max;
|
|
}
|
|
|
|
struct mctp_route *mctp_route_lookup(struct net *net, unsigned int dnet,
|
|
mctp_eid_t daddr)
|
|
{
|
|
struct mctp_route *tmp, *rt = NULL;
|
|
|
|
list_for_each_entry_rcu(tmp, &net->mctp.routes, list) {
|
|
/* TODO: add metrics */
|
|
if (mctp_rt_match_eid(tmp, dnet, daddr)) {
|
|
if (refcount_inc_not_zero(&tmp->refs)) {
|
|
rt = tmp;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
return rt;
|
|
}
|
|
|
|
static struct mctp_route *mctp_route_lookup_null(struct net *net,
|
|
struct net_device *dev)
|
|
{
|
|
struct mctp_route *rt;
|
|
|
|
list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
|
|
if (rt->dev->dev == dev && rt->type == RTN_LOCAL &&
|
|
refcount_inc_not_zero(&rt->refs))
|
|
return rt;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int mctp_do_fragment_route(struct mctp_route *rt, struct sk_buff *skb,
|
|
unsigned int mtu, u8 tag)
|
|
{
|
|
const unsigned int hlen = sizeof(struct mctp_hdr);
|
|
struct mctp_hdr *hdr, *hdr2;
|
|
unsigned int pos, size;
|
|
struct sk_buff *skb2;
|
|
int rc;
|
|
u8 seq;
|
|
|
|
hdr = mctp_hdr(skb);
|
|
seq = 0;
|
|
rc = 0;
|
|
|
|
if (mtu < hlen + 1) {
|
|
kfree_skb(skb);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
/* we've got the header */
|
|
skb_pull(skb, hlen);
|
|
|
|
for (pos = 0; pos < skb->len;) {
|
|
/* size of message payload */
|
|
size = min(mtu - hlen, skb->len - pos);
|
|
|
|
skb2 = alloc_skb(MCTP_HEADER_MAXLEN + hlen + size, GFP_KERNEL);
|
|
if (!skb2) {
|
|
rc = -ENOMEM;
|
|
break;
|
|
}
|
|
|
|
/* generic skb copy */
|
|
skb2->protocol = skb->protocol;
|
|
skb2->priority = skb->priority;
|
|
skb2->dev = skb->dev;
|
|
memcpy(skb2->cb, skb->cb, sizeof(skb2->cb));
|
|
|
|
if (skb->sk)
|
|
skb_set_owner_w(skb2, skb->sk);
|
|
|
|
/* establish packet */
|
|
skb_reserve(skb2, MCTP_HEADER_MAXLEN);
|
|
skb_reset_network_header(skb2);
|
|
skb_put(skb2, hlen + size);
|
|
skb2->transport_header = skb2->network_header + hlen;
|
|
|
|
/* copy header fields, calculate SOM/EOM flags & seq */
|
|
hdr2 = mctp_hdr(skb2);
|
|
hdr2->ver = hdr->ver;
|
|
hdr2->dest = hdr->dest;
|
|
hdr2->src = hdr->src;
|
|
hdr2->flags_seq_tag = tag &
|
|
(MCTP_HDR_TAG_MASK | MCTP_HDR_FLAG_TO);
|
|
|
|
if (pos == 0)
|
|
hdr2->flags_seq_tag |= MCTP_HDR_FLAG_SOM;
|
|
|
|
if (pos + size == skb->len)
|
|
hdr2->flags_seq_tag |= MCTP_HDR_FLAG_EOM;
|
|
|
|
hdr2->flags_seq_tag |= seq << MCTP_HDR_SEQ_SHIFT;
|
|
|
|
/* copy message payload */
|
|
skb_copy_bits(skb, pos, skb_transport_header(skb2), size);
|
|
|
|
/* do route */
|
|
rc = rt->output(rt, skb2);
|
|
if (rc)
|
|
break;
|
|
|
|
seq = (seq + 1) & MCTP_HDR_SEQ_MASK;
|
|
pos += size;
|
|
}
|
|
|
|
consume_skb(skb);
|
|
return rc;
|
|
}
|
|
|
|
int mctp_local_output(struct sock *sk, struct mctp_route *rt,
|
|
struct sk_buff *skb, mctp_eid_t daddr, u8 req_tag)
|
|
{
|
|
struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
|
|
struct mctp_skb_cb *cb = mctp_cb(skb);
|
|
struct mctp_route tmp_rt;
|
|
struct mctp_sk_key *key;
|
|
struct net_device *dev;
|
|
struct mctp_hdr *hdr;
|
|
unsigned long flags;
|
|
unsigned int mtu;
|
|
mctp_eid_t saddr;
|
|
bool ext_rt;
|
|
int rc;
|
|
u8 tag;
|
|
|
|
rc = -ENODEV;
|
|
|
|
if (rt) {
|
|
ext_rt = false;
|
|
dev = NULL;
|
|
|
|
if (WARN_ON(!rt->dev))
|
|
goto out_release;
|
|
|
|
} else if (cb->ifindex) {
|
|
ext_rt = true;
|
|
rt = &tmp_rt;
|
|
|
|
rcu_read_lock();
|
|
dev = dev_get_by_index_rcu(sock_net(sk), cb->ifindex);
|
|
if (!dev) {
|
|
rcu_read_unlock();
|
|
return rc;
|
|
}
|
|
|
|
rt->dev = __mctp_dev_get(dev);
|
|
rcu_read_unlock();
|
|
|
|
if (!rt->dev)
|
|
goto out_release;
|
|
|
|
/* establish temporary route - we set up enough to keep
|
|
* mctp_route_output happy
|
|
*/
|
|
rt->output = mctp_route_output;
|
|
rt->mtu = 0;
|
|
|
|
} else {
|
|
return -EINVAL;
|
|
}
|
|
|
|
spin_lock_irqsave(&rt->dev->addrs_lock, flags);
|
|
if (rt->dev->num_addrs == 0) {
|
|
rc = -EHOSTUNREACH;
|
|
} else {
|
|
/* use the outbound interface's first address as our source */
|
|
saddr = rt->dev->addrs[0];
|
|
rc = 0;
|
|
}
|
|
spin_unlock_irqrestore(&rt->dev->addrs_lock, flags);
|
|
|
|
if (rc)
|
|
goto out_release;
|
|
|
|
if (req_tag & MCTP_HDR_FLAG_TO) {
|
|
key = mctp_alloc_local_tag(msk, saddr, daddr, &tag);
|
|
if (IS_ERR(key)) {
|
|
rc = PTR_ERR(key);
|
|
goto out_release;
|
|
}
|
|
mctp_skb_set_flow(skb, key);
|
|
/* done with the key in this scope */
|
|
mctp_key_unref(key);
|
|
tag |= MCTP_HDR_FLAG_TO;
|
|
} else {
|
|
key = NULL;
|
|
tag = req_tag;
|
|
}
|
|
|
|
skb->protocol = htons(ETH_P_MCTP);
|
|
skb->priority = 0;
|
|
skb_reset_transport_header(skb);
|
|
skb_push(skb, sizeof(struct mctp_hdr));
|
|
skb_reset_network_header(skb);
|
|
skb->dev = rt->dev->dev;
|
|
|
|
/* cb->net will have been set on initial ingress */
|
|
cb->src = saddr;
|
|
|
|
/* set up common header fields */
|
|
hdr = mctp_hdr(skb);
|
|
hdr->ver = 1;
|
|
hdr->dest = daddr;
|
|
hdr->src = saddr;
|
|
|
|
mtu = mctp_route_mtu(rt);
|
|
|
|
if (skb->len + sizeof(struct mctp_hdr) <= mtu) {
|
|
hdr->flags_seq_tag = MCTP_HDR_FLAG_SOM |
|
|
MCTP_HDR_FLAG_EOM | tag;
|
|
rc = rt->output(rt, skb);
|
|
} else {
|
|
rc = mctp_do_fragment_route(rt, skb, mtu, tag);
|
|
}
|
|
|
|
out_release:
|
|
if (!ext_rt)
|
|
mctp_route_release(rt);
|
|
|
|
dev_put(dev);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
/* route management */
|
|
static int mctp_route_add(struct mctp_dev *mdev, mctp_eid_t daddr_start,
|
|
unsigned int daddr_extent, unsigned int mtu,
|
|
unsigned char type)
|
|
{
|
|
int (*rtfn)(struct mctp_route *rt, struct sk_buff *skb);
|
|
struct net *net = dev_net(mdev->dev);
|
|
struct mctp_route *rt, *ert;
|
|
|
|
if (!mctp_address_ok(daddr_start))
|
|
return -EINVAL;
|
|
|
|
if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
|
|
return -EINVAL;
|
|
|
|
switch (type) {
|
|
case RTN_LOCAL:
|
|
rtfn = mctp_route_input;
|
|
break;
|
|
case RTN_UNICAST:
|
|
rtfn = mctp_route_output;
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
|
|
rt = mctp_route_alloc();
|
|
if (!rt)
|
|
return -ENOMEM;
|
|
|
|
rt->min = daddr_start;
|
|
rt->max = daddr_start + daddr_extent;
|
|
rt->mtu = mtu;
|
|
rt->dev = mdev;
|
|
mctp_dev_hold(rt->dev);
|
|
rt->type = type;
|
|
rt->output = rtfn;
|
|
|
|
ASSERT_RTNL();
|
|
/* Prevent duplicate identical routes. */
|
|
list_for_each_entry(ert, &net->mctp.routes, list) {
|
|
if (mctp_rt_compare_exact(rt, ert)) {
|
|
mctp_route_release(rt);
|
|
return -EEXIST;
|
|
}
|
|
}
|
|
|
|
list_add_rcu(&rt->list, &net->mctp.routes);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mctp_route_remove(struct mctp_dev *mdev, mctp_eid_t daddr_start,
|
|
unsigned int daddr_extent, unsigned char type)
|
|
{
|
|
struct net *net = dev_net(mdev->dev);
|
|
struct mctp_route *rt, *tmp;
|
|
mctp_eid_t daddr_end;
|
|
bool dropped;
|
|
|
|
if (daddr_extent > 0xff || daddr_start + daddr_extent >= 255)
|
|
return -EINVAL;
|
|
|
|
daddr_end = daddr_start + daddr_extent;
|
|
dropped = false;
|
|
|
|
ASSERT_RTNL();
|
|
|
|
list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
|
|
if (rt->dev == mdev &&
|
|
rt->min == daddr_start && rt->max == daddr_end &&
|
|
rt->type == type) {
|
|
list_del_rcu(&rt->list);
|
|
/* TODO: immediate RTM_DELROUTE */
|
|
mctp_route_release(rt);
|
|
dropped = true;
|
|
}
|
|
}
|
|
|
|
return dropped ? 0 : -ENOENT;
|
|
}
|
|
|
|
int mctp_route_add_local(struct mctp_dev *mdev, mctp_eid_t addr)
|
|
{
|
|
return mctp_route_add(mdev, addr, 0, 0, RTN_LOCAL);
|
|
}
|
|
|
|
int mctp_route_remove_local(struct mctp_dev *mdev, mctp_eid_t addr)
|
|
{
|
|
return mctp_route_remove(mdev, addr, 0, RTN_LOCAL);
|
|
}
|
|
|
|
/* removes all entries for a given device */
|
|
void mctp_route_remove_dev(struct mctp_dev *mdev)
|
|
{
|
|
struct net *net = dev_net(mdev->dev);
|
|
struct mctp_route *rt, *tmp;
|
|
|
|
ASSERT_RTNL();
|
|
list_for_each_entry_safe(rt, tmp, &net->mctp.routes, list) {
|
|
if (rt->dev == mdev) {
|
|
list_del_rcu(&rt->list);
|
|
/* TODO: immediate RTM_DELROUTE */
|
|
mctp_route_release(rt);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Incoming packet-handling */
|
|
|
|
static int mctp_pkttype_receive(struct sk_buff *skb, struct net_device *dev,
|
|
struct packet_type *pt,
|
|
struct net_device *orig_dev)
|
|
{
|
|
struct net *net = dev_net(dev);
|
|
struct mctp_dev *mdev;
|
|
struct mctp_skb_cb *cb;
|
|
struct mctp_route *rt;
|
|
struct mctp_hdr *mh;
|
|
|
|
rcu_read_lock();
|
|
mdev = __mctp_dev_get(dev);
|
|
rcu_read_unlock();
|
|
if (!mdev) {
|
|
/* basic non-data sanity checks */
|
|
goto err_drop;
|
|
}
|
|
|
|
if (!pskb_may_pull(skb, sizeof(struct mctp_hdr)))
|
|
goto err_drop;
|
|
|
|
skb_reset_transport_header(skb);
|
|
skb_reset_network_header(skb);
|
|
|
|
/* We have enough for a header; decode and route */
|
|
mh = mctp_hdr(skb);
|
|
if (mh->ver < MCTP_VER_MIN || mh->ver > MCTP_VER_MAX)
|
|
goto err_drop;
|
|
|
|
/* MCTP drivers must populate halen/haddr */
|
|
if (dev->type == ARPHRD_MCTP) {
|
|
cb = mctp_cb(skb);
|
|
} else {
|
|
cb = __mctp_cb(skb);
|
|
cb->halen = 0;
|
|
}
|
|
cb->net = READ_ONCE(mdev->net);
|
|
cb->ifindex = dev->ifindex;
|
|
|
|
rt = mctp_route_lookup(net, cb->net, mh->dest);
|
|
|
|
/* NULL EID, but addressed to our physical address */
|
|
if (!rt && mh->dest == MCTP_ADDR_NULL && skb->pkt_type == PACKET_HOST)
|
|
rt = mctp_route_lookup_null(net, dev);
|
|
|
|
if (!rt)
|
|
goto err_drop;
|
|
|
|
rt->output(rt, skb);
|
|
mctp_route_release(rt);
|
|
|
|
return NET_RX_SUCCESS;
|
|
|
|
err_drop:
|
|
kfree_skb(skb);
|
|
return NET_RX_DROP;
|
|
}
|
|
|
|
static struct packet_type mctp_packet_type = {
|
|
.type = cpu_to_be16(ETH_P_MCTP),
|
|
.func = mctp_pkttype_receive,
|
|
};
|
|
|
|
/* netlink interface */
|
|
|
|
static const struct nla_policy rta_mctp_policy[RTA_MAX + 1] = {
|
|
[RTA_DST] = { .type = NLA_U8 },
|
|
[RTA_METRICS] = { .type = NLA_NESTED },
|
|
[RTA_OIF] = { .type = NLA_U32 },
|
|
};
|
|
|
|
/* Common part for RTM_NEWROUTE and RTM_DELROUTE parsing.
|
|
* tb must hold RTA_MAX+1 elements.
|
|
*/
|
|
static int mctp_route_nlparse(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack,
|
|
struct nlattr **tb, struct rtmsg **rtm,
|
|
struct mctp_dev **mdev, mctp_eid_t *daddr_start)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct net_device *dev;
|
|
unsigned int ifindex;
|
|
int rc;
|
|
|
|
rc = nlmsg_parse(nlh, sizeof(struct rtmsg), tb, RTA_MAX,
|
|
rta_mctp_policy, extack);
|
|
if (rc < 0) {
|
|
NL_SET_ERR_MSG(extack, "incorrect format");
|
|
return rc;
|
|
}
|
|
|
|
if (!tb[RTA_DST]) {
|
|
NL_SET_ERR_MSG(extack, "dst EID missing");
|
|
return -EINVAL;
|
|
}
|
|
*daddr_start = nla_get_u8(tb[RTA_DST]);
|
|
|
|
if (!tb[RTA_OIF]) {
|
|
NL_SET_ERR_MSG(extack, "ifindex missing");
|
|
return -EINVAL;
|
|
}
|
|
ifindex = nla_get_u32(tb[RTA_OIF]);
|
|
|
|
*rtm = nlmsg_data(nlh);
|
|
if ((*rtm)->rtm_family != AF_MCTP) {
|
|
NL_SET_ERR_MSG(extack, "route family must be AF_MCTP");
|
|
return -EINVAL;
|
|
}
|
|
|
|
dev = __dev_get_by_index(net, ifindex);
|
|
if (!dev) {
|
|
NL_SET_ERR_MSG(extack, "bad ifindex");
|
|
return -ENODEV;
|
|
}
|
|
*mdev = mctp_dev_get_rtnl(dev);
|
|
if (!*mdev)
|
|
return -ENODEV;
|
|
|
|
if (dev->flags & IFF_LOOPBACK) {
|
|
NL_SET_ERR_MSG(extack, "no routes to loopback");
|
|
return -EINVAL;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct nla_policy rta_metrics_policy[RTAX_MAX + 1] = {
|
|
[RTAX_MTU] = { .type = NLA_U32 },
|
|
};
|
|
|
|
static int mctp_newroute(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[RTA_MAX + 1];
|
|
struct nlattr *tbx[RTAX_MAX + 1];
|
|
mctp_eid_t daddr_start;
|
|
struct mctp_dev *mdev;
|
|
struct rtmsg *rtm;
|
|
unsigned int mtu;
|
|
int rc;
|
|
|
|
rc = mctp_route_nlparse(skb, nlh, extack, tb,
|
|
&rtm, &mdev, &daddr_start);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
if (rtm->rtm_type != RTN_UNICAST) {
|
|
NL_SET_ERR_MSG(extack, "rtm_type must be RTN_UNICAST");
|
|
return -EINVAL;
|
|
}
|
|
|
|
mtu = 0;
|
|
if (tb[RTA_METRICS]) {
|
|
rc = nla_parse_nested(tbx, RTAX_MAX, tb[RTA_METRICS],
|
|
rta_metrics_policy, NULL);
|
|
if (rc < 0)
|
|
return rc;
|
|
if (tbx[RTAX_MTU])
|
|
mtu = nla_get_u32(tbx[RTAX_MTU]);
|
|
}
|
|
|
|
if (rtm->rtm_type != RTN_UNICAST)
|
|
return -EINVAL;
|
|
|
|
rc = mctp_route_add(mdev, daddr_start, rtm->rtm_dst_len, mtu,
|
|
rtm->rtm_type);
|
|
return rc;
|
|
}
|
|
|
|
static int mctp_delroute(struct sk_buff *skb, struct nlmsghdr *nlh,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct nlattr *tb[RTA_MAX + 1];
|
|
mctp_eid_t daddr_start;
|
|
struct mctp_dev *mdev;
|
|
struct rtmsg *rtm;
|
|
int rc;
|
|
|
|
rc = mctp_route_nlparse(skb, nlh, extack, tb,
|
|
&rtm, &mdev, &daddr_start);
|
|
if (rc < 0)
|
|
return rc;
|
|
|
|
/* we only have unicast routes */
|
|
if (rtm->rtm_type != RTN_UNICAST)
|
|
return -EINVAL;
|
|
|
|
rc = mctp_route_remove(mdev, daddr_start, rtm->rtm_dst_len, RTN_UNICAST);
|
|
return rc;
|
|
}
|
|
|
|
static int mctp_fill_rtinfo(struct sk_buff *skb, struct mctp_route *rt,
|
|
u32 portid, u32 seq, int event, unsigned int flags)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
struct rtmsg *hdr;
|
|
void *metrics;
|
|
|
|
nlh = nlmsg_put(skb, portid, seq, event, sizeof(*hdr), flags);
|
|
if (!nlh)
|
|
return -EMSGSIZE;
|
|
|
|
hdr = nlmsg_data(nlh);
|
|
hdr->rtm_family = AF_MCTP;
|
|
|
|
/* we use the _len fields as a number of EIDs, rather than
|
|
* a number of bits in the address
|
|
*/
|
|
hdr->rtm_dst_len = rt->max - rt->min;
|
|
hdr->rtm_src_len = 0;
|
|
hdr->rtm_tos = 0;
|
|
hdr->rtm_table = RT_TABLE_DEFAULT;
|
|
hdr->rtm_protocol = RTPROT_STATIC; /* everything is user-defined */
|
|
hdr->rtm_scope = RT_SCOPE_LINK; /* TODO: scope in mctp_route? */
|
|
hdr->rtm_type = rt->type;
|
|
|
|
if (nla_put_u8(skb, RTA_DST, rt->min))
|
|
goto cancel;
|
|
|
|
metrics = nla_nest_start_noflag(skb, RTA_METRICS);
|
|
if (!metrics)
|
|
goto cancel;
|
|
|
|
if (rt->mtu) {
|
|
if (nla_put_u32(skb, RTAX_MTU, rt->mtu))
|
|
goto cancel;
|
|
}
|
|
|
|
nla_nest_end(skb, metrics);
|
|
|
|
if (rt->dev) {
|
|
if (nla_put_u32(skb, RTA_OIF, rt->dev->dev->ifindex))
|
|
goto cancel;
|
|
}
|
|
|
|
/* TODO: conditional neighbour physaddr? */
|
|
|
|
nlmsg_end(skb, nlh);
|
|
|
|
return 0;
|
|
|
|
cancel:
|
|
nlmsg_cancel(skb, nlh);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int mctp_dump_rtinfo(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct net *net = sock_net(skb->sk);
|
|
struct mctp_route *rt;
|
|
int s_idx, idx;
|
|
|
|
/* TODO: allow filtering on route data, possibly under
|
|
* cb->strict_check
|
|
*/
|
|
|
|
/* TODO: change to struct overlay */
|
|
s_idx = cb->args[0];
|
|
idx = 0;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(rt, &net->mctp.routes, list) {
|
|
if (idx++ < s_idx)
|
|
continue;
|
|
if (mctp_fill_rtinfo(skb, rt,
|
|
NETLINK_CB(cb->skb).portid,
|
|
cb->nlh->nlmsg_seq,
|
|
RTM_NEWROUTE, NLM_F_MULTI) < 0)
|
|
break;
|
|
}
|
|
|
|
rcu_read_unlock();
|
|
cb->args[0] = idx;
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
/* net namespace implementation */
|
|
static int __net_init mctp_routes_net_init(struct net *net)
|
|
{
|
|
struct netns_mctp *ns = &net->mctp;
|
|
|
|
INIT_LIST_HEAD(&ns->routes);
|
|
INIT_HLIST_HEAD(&ns->binds);
|
|
mutex_init(&ns->bind_lock);
|
|
INIT_HLIST_HEAD(&ns->keys);
|
|
spin_lock_init(&ns->keys_lock);
|
|
WARN_ON(mctp_default_net_set(net, MCTP_INITIAL_DEFAULT_NET));
|
|
return 0;
|
|
}
|
|
|
|
static void __net_exit mctp_routes_net_exit(struct net *net)
|
|
{
|
|
struct mctp_route *rt;
|
|
|
|
rcu_read_lock();
|
|
list_for_each_entry_rcu(rt, &net->mctp.routes, list)
|
|
mctp_route_release(rt);
|
|
rcu_read_unlock();
|
|
}
|
|
|
|
static struct pernet_operations mctp_net_ops = {
|
|
.init = mctp_routes_net_init,
|
|
.exit = mctp_routes_net_exit,
|
|
};
|
|
|
|
int __init mctp_routes_init(void)
|
|
{
|
|
dev_add_pack(&mctp_packet_type);
|
|
|
|
rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_GETROUTE,
|
|
NULL, mctp_dump_rtinfo, 0);
|
|
rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_NEWROUTE,
|
|
mctp_newroute, NULL, 0);
|
|
rtnl_register_module(THIS_MODULE, PF_MCTP, RTM_DELROUTE,
|
|
mctp_delroute, NULL, 0);
|
|
|
|
return register_pernet_subsys(&mctp_net_ops);
|
|
}
|
|
|
|
void __exit mctp_routes_exit(void)
|
|
{
|
|
unregister_pernet_subsys(&mctp_net_ops);
|
|
rtnl_unregister(PF_MCTP, RTM_DELROUTE);
|
|
rtnl_unregister(PF_MCTP, RTM_NEWROUTE);
|
|
rtnl_unregister(PF_MCTP, RTM_GETROUTE);
|
|
dev_remove_pack(&mctp_packet_type);
|
|
}
|
|
|
|
#if IS_ENABLED(CONFIG_MCTP_TEST)
|
|
#include "test/route-test.c"
|
|
#endif
|