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Commit 1db20a52 authored by David S. Miller's avatar David S. Miller
Browse files

nfnetlink_log: Stop using NLA_PUT*(). 



These macros contain a hidden goto, and are thus extremely error
prone and make code hard to audit.

Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent a447189e

net/netfilter/nfnetlink_log.c

+58 −42
Original line number Diff line number Diff line
@@ -391,67 +391,78 @@ __build_packet_message(struct nfulnl_instance *inst, 
	pmsg.hw_protocol	= skb->protocol;

	pmsg.hook		= hooknum;



	NLA_PUT(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg);

	if (nla_put(inst->skb, NFULA_PACKET_HDR, sizeof(pmsg), &pmsg))

		goto nla_put_failure;



	if (prefix)

		NLA_PUT(inst->skb, NFULA_PREFIX, plen, prefix);

	if (prefix &&

	    nla_put(inst->skb, NFULA_PREFIX, plen, prefix))

		goto nla_put_failure;



	if (indev) {

#ifndef CONFIG_BRIDGE_NETFILTER

		NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,

			     htonl(indev->ifindex));

		if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,

				 htonl(indev->ifindex)))

			goto nla_put_failure;

#else

		if (pf == PF_BRIDGE) {

			/* Case 1: outdev is physical input device, we need to

			 * look for bridge group (when called from

			 * netfilter_bridge) */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV,

				     htonl(indev->ifindex));

			if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,

					 htonl(indev->ifindex)) ||

			/* this is the bridge group "brX" */

			/* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,

				     htonl(br_port_get_rcu(indev)->br->dev->ifindex));

			    nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,

					 htonl(br_port_get_rcu(indev)->br->dev->ifindex)))

				goto nla_put_failure;

		} else {

			/* Case 2: indev is bridge group, we need to look for

			 * physical device (when called from ipv4) */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_INDEV,

				     htonl(indev->ifindex));

			if (skb->nf_bridge && skb->nf_bridge->physindev)

				NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSINDEV,

					     htonl(skb->nf_bridge->physindev->ifindex));

			if (nla_put_be32(inst->skb, NFULA_IFINDEX_INDEV,

					 htonl(indev->ifindex)))

				goto nla_put_failure;

			if (skb->nf_bridge && skb->nf_bridge->physindev &&

			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSINDEV,

					 htonl(skb->nf_bridge->physindev->ifindex)))

				goto nla_put_failure;

		}

#endif

	}



	if (outdev) {

#ifndef CONFIG_BRIDGE_NETFILTER

		NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,

			     htonl(outdev->ifindex));

		if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,

				 htonl(outdev->ifindex)))

			goto nla_put_failure;

#else

		if (pf == PF_BRIDGE) {

			/* Case 1: outdev is physical output device, we need to

			 * look for bridge group (when called from

			 * netfilter_bridge) */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,

				     htonl(outdev->ifindex));

			if (nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,

					 htonl(outdev->ifindex)) ||

			/* this is the bridge group "brX" */

			/* rcu_read_lock()ed by nf_hook_slow or nf_log_packet */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,

				     htonl(br_port_get_rcu(outdev)->br->dev->ifindex));

			    nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,

					 htonl(br_port_get_rcu(outdev)->br->dev->ifindex)))

				goto nla_put_failure;

		} else {

			/* Case 2: indev is a bridge group, we need to look

			 * for physical device (when called from ipv4) */

			NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_OUTDEV,

				     htonl(outdev->ifindex));

			if (skb->nf_bridge && skb->nf_bridge->physoutdev)

				NLA_PUT_BE32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,

					     htonl(skb->nf_bridge->physoutdev->ifindex));

			if (nla_put_be32(inst->skb, NFULA_IFINDEX_OUTDEV,

					 htonl(outdev->ifindex)))

				goto nla_put_failure;

			if (skb->nf_bridge && skb->nf_bridge->physoutdev &&

			    nla_put_be32(inst->skb, NFULA_IFINDEX_PHYSOUTDEV,

					 htonl(skb->nf_bridge->physoutdev->ifindex)))

				goto nla_put_failure;

		}

#endif

	}



	if (skb->mark)

		NLA_PUT_BE32(inst->skb, NFULA_MARK, htonl(skb->mark));

	if (skb->mark &&

	    nla_put_be32(inst->skb, NFULA_MARK, htonl(skb->mark)))

		goto nla_put_failure;



	if (indev && skb->dev &&

	    skb->mac_header != skb->network_header) {
@@ -459,16 +470,18 @@ __build_packet_message(struct nfulnl_instance *inst, 
		int len = dev_parse_header(skb, phw.hw_addr);

		if (len > 0) {

			phw.hw_addrlen = htons(len);

			NLA_PUT(inst->skb, NFULA_HWADDR, sizeof(phw), &phw);

			if (nla_put(inst->skb, NFULA_HWADDR, sizeof(phw), &phw))

				goto nla_put_failure;

		}

	}



	if (indev && skb_mac_header_was_set(skb)) {

		NLA_PUT_BE16(inst->skb, NFULA_HWTYPE, htons(skb->dev->type));

		NLA_PUT_BE16(inst->skb, NFULA_HWLEN,

			     htons(skb->dev->hard_header_len));

		NLA_PUT(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len,

			skb_mac_header(skb));

		if (nla_put_be32(inst->skb, NFULA_HWTYPE, htons(skb->dev->type)) ||

		    nla_put_be16(inst->skb, NFULA_HWLEN,

				 htons(skb->dev->hard_header_len)) ||

		    nla_put(inst->skb, NFULA_HWHEADER, skb->dev->hard_header_len,

			    skb_mac_header(skb)))

			goto nla_put_failure;

	}



	if (skb->tstamp.tv64) {
@@ -477,7 +490,8 @@ __build_packet_message(struct nfulnl_instance *inst, 
		ts.sec = cpu_to_be64(tv.tv_sec);

		ts.usec = cpu_to_be64(tv.tv_usec);



		NLA_PUT(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts);

		if (nla_put(inst->skb, NFULA_TIMESTAMP, sizeof(ts), &ts))

			goto nla_put_failure;

	}



	/* UID */
@@ -487,22 +501,24 @@ __build_packet_message(struct nfulnl_instance *inst, 
			struct file *file = skb->sk->sk_socket->file;

			__be32 uid = htonl(file->f_cred->fsuid);

			__be32 gid = htonl(file->f_cred->fsgid);

			/* need to unlock here since NLA_PUT may goto */

			read_unlock_bh(&skb->sk->sk_callback_lock);

			NLA_PUT_BE32(inst->skb, NFULA_UID, uid);

			NLA_PUT_BE32(inst->skb, NFULA_GID, gid);

			if (nla_put_be32(inst->skb, NFULA_UID, uid) ||

			    nla_put_be32(inst->skb, NFULA_GID, gid))

				goto nla_put_failure;

		} else

			read_unlock_bh(&skb->sk->sk_callback_lock);

	}



	/* local sequence number */

	if (inst->flags & NFULNL_CFG_F_SEQ)

		NLA_PUT_BE32(inst->skb, NFULA_SEQ, htonl(inst->seq++));

	if ((inst->flags & NFULNL_CFG_F_SEQ) &&

	    nla_put_be32(inst->skb, NFULA_SEQ, htonl(inst->seq++)))

		goto nla_put_failure;



	/* global sequence number */

	if (inst->flags & NFULNL_CFG_F_SEQ_GLOBAL)

		NLA_PUT_BE32(inst->skb, NFULA_SEQ_GLOBAL,

			     htonl(atomic_inc_return(&global_seq)));

	if ((inst->flags & NFULNL_CFG_F_SEQ_GLOBAL) &&

	    nla_put_be32(inst->skb, NFULA_SEQ_GLOBAL,

			 htonl(atomic_inc_return(&global_seq))))

		goto nla_put_failure;



	if (data_len) {

		struct nlattr *nla;