mctp: Use output netdev to allocate skb headroom

Previously the skb was allocated with headroom MCTP_HEADER_MAXLEN,
but that isn't sufficient if we are using devs that are not MCTP
specific.

This also adds a check that the smctp_halen provided to sendmsg for
extended addressing is the correct size for the netdev.

Fixes: 833ef3b91de6 ("mctp: Populate socket implementation")
Reported-by: Matthew Rinaldi <[e-mail]>
Signed-off-by: Matt Johnston <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

include/net/mctp.h

···
 #define MCTP_HDR_TAG_SHIFT	0
 #define MCTP_HDR_TAG_MASK	GENMASK(2, 0)
 
-#define MCTP_HEADER_MAXLEN	4
-
 #define MCTP_INITIAL_DEFAULT_NET	1
 
 static inline bool mctp_address_unicast(mctp_eid_t eid)

net/mctp/af_mctp.c

···
 static int mctp_sendmsg(struct socket *sock, struct msghdr *msg, size_t len)
 {
 	DECLARE_SOCKADDR(struct sockaddr_mctp *, addr, msg->msg_name);
-	const int hlen = MCTP_HEADER_MAXLEN + sizeof(struct mctp_hdr);
 	int rc, addrlen = msg->msg_namelen;
 	struct sock *sk = sock->sk;
 	struct mctp_sock *msk = container_of(sk, struct mctp_sock, sk);
 	struct mctp_skb_cb *cb;
 	struct mctp_route *rt;
-	struct sk_buff *skb;
+	struct sk_buff *skb = NULL;
+	int hlen;
 
 	if (addr) {
 		const u8 tagbits = MCTP_TAG_MASK | MCTP_TAG_OWNER |
···
 	if (addr->smctp_network == MCTP_NET_ANY)
 		addr->smctp_network = mctp_default_net(sock_net(sk));
 
+	/* direct addressing */
+	if (msk->addr_ext && addrlen >= sizeof(struct sockaddr_mctp_ext)) {
+		DECLARE_SOCKADDR(struct sockaddr_mctp_ext *,
+				 extaddr, msg->msg_name);
+		struct net_device *dev;
+
+		rc = -EINVAL;
+		rcu_read_lock();
+		dev = dev_get_by_index_rcu(sock_net(sk), extaddr->smctp_ifindex);
+		/* check for correct halen */
+		if (dev && extaddr->smctp_halen == dev->addr_len) {
+			hlen = LL_RESERVED_SPACE(dev) + sizeof(struct mctp_hdr);
+			rc = 0;
+		}
+		rcu_read_unlock();
+		if (rc)
+			goto err_free;
+		rt = NULL;
+	} else {
+		rt = mctp_route_lookup(sock_net(sk), addr->smctp_network,
+				       addr->smctp_addr.s_addr);
+		if (!rt) {
+			rc = -EHOSTUNREACH;
+			goto err_free;
+		}
+		hlen = LL_RESERVED_SPACE(rt->dev->dev) + sizeof(struct mctp_hdr);
+	}
+
 	skb = sock_alloc_send_skb(sk, hlen + 1 + len,
 				  msg->msg_flags & MSG_DONTWAIT, &rc);
 	if (!skb)
···
 	cb = __mctp_cb(skb);
 	cb->net = addr->smctp_network;
 
-	/* direct addressing */
-	if (msk->addr_ext && addrlen >= sizeof(struct sockaddr_mctp_ext)) {
+	if (!rt) {
+		/* fill extended address in cb */
 		DECLARE_SOCKADDR(struct sockaddr_mctp_ext *,
 				 extaddr, msg->msg_name);
 
···
 		}
 
 		cb->ifindex = extaddr->smctp_ifindex;
+		/* smctp_halen is checked above */
 		cb->halen = extaddr->smctp_halen;
 		memcpy(cb->haddr, extaddr->smctp_haddr, cb->halen);
-
-		rt = NULL;
-	} else {
-		rt = mctp_route_lookup(sock_net(sk), addr->smctp_network,
-				       addr->smctp_addr.s_addr);
-		if (!rt) {
-			rc = -EHOSTUNREACH;
-			goto err_free;
-		}
 	}
 
 	rc = mctp_local_output(sk, rt, skb, addr->smctp_addr.s_addr,

net/mctp/route.c

···
 
 	if (cb->ifindex) {
 		/* direct route; use the hwaddr we stashed in sendmsg */
+		if (cb->halen != skb->dev->addr_len) {
+			/* sanity check, sendmsg should have already caught this */
+			kfree_skb(skb);
+			return -EMSGSIZE;
+		}
 		daddr = cb->haddr;
 	} else {
 		/* If lookup fails let the device handle daddr==NULL */
···
 {
 	const unsigned int hlen = sizeof(struct mctp_hdr);
 	struct mctp_hdr *hdr, *hdr2;
-	unsigned int pos, size;
+	unsigned int pos, size, headroom;
 	struct sk_buff *skb2;
 	int rc;
 	u8 seq;
···
 		return -EMSGSIZE;
 	}
 
+	/* keep same headroom as the original skb */
+	headroom = skb_headroom(skb);
+
 	/* we've got the header */
 	skb_pull(skb, hlen);
 
···
 		/* size of message payload */
 		size = min(mtu - hlen, skb->len - pos);
 
-		skb2 = alloc_skb(MCTP_HEADER_MAXLEN + hlen + size, GFP_KERNEL);
+		skb2 = alloc_skb(headroom + hlen + size, GFP_KERNEL);
 		if (!skb2) {
 			rc = -ENOMEM;
 			break;
···
 			skb_set_owner_w(skb2, skb->sk);
 
 		/* establish packet */
-		skb_reserve(skb2, MCTP_HEADER_MAXLEN);
+		skb_reserve(skb2, headroom);
 		skb_reset_network_header(skb2);
 		skb_put(skb2, hlen + size);
 		skb2->transport_header = skb2->network_header + hlen;