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From: Tom Herbert <tom@herbertland.com>
To: <davem@davemloft.net>, <netdev@vger.kernel.org>
Cc: <kernel-team@fb.com>
Subject: [PATCH net-next 04/11] flow_dissector: Jump to exit code in __skb_flow_dissect
Date: Tue, 1 Sep 2015 09:24:26 -0700	[thread overview]
Message-ID: <1441124673-3438470-5-git-send-email-tom@herbertland.com> (raw)
In-Reply-To: <1441124673-3438470-1-git-send-email-tom@herbertland.com>

Instead of returning immediately (on a parsing failure for instance) we
jump to cleanup code. This always sets protocol values in key_control
(even on a failure there is still valid information in the key_tags that
was set before the problem was hit).

Signed-off-by: Tom Herbert <tom@herbertland.com>
---
 net/core/flow_dissector.c | 51 +++++++++++++++++++++++------------------------
 1 file changed, 25 insertions(+), 26 deletions(-)

diff --git a/net/core/flow_dissector.c b/net/core/flow_dissector.c
index 151b6e4..22f3d76 100644
--- a/net/core/flow_dissector.c
+++ b/net/core/flow_dissector.c
@@ -130,6 +130,7 @@ bool __skb_flow_dissect(const struct sk_buff *skb,
 	struct flow_dissector_key_tags *key_tags;
 	struct flow_dissector_key_keyid *key_keyid;
 	u8 ip_proto = 0;
+	bool ret = false;
 
 	if (!data) {
 		data = skb->data;
@@ -171,7 +172,7 @@ again:
 ip:
 		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 		if (!iph || iph->ihl < 5)
-			return false;
+			goto out_bad;
 		nhoff += iph->ihl * 4;
 
 		ip_proto = iph->protocol;
@@ -197,7 +198,7 @@ ip:
 ipv6:
 		iph = __skb_header_pointer(skb, nhoff, sizeof(_iph), data, hlen, &_iph);
 		if (!iph)
-			return false;
+			goto out_bad;
 
 		ip_proto = iph->nexthdr;
 		nhoff += sizeof(struct ipv6hdr);
@@ -234,7 +235,7 @@ ipv6:
 
 		vlan = __skb_header_pointer(skb, nhoff, sizeof(_vlan), data, hlen, &_vlan);
 		if (!vlan)
-			return false;
+			goto out_bad;
 
 		if (skb_flow_dissector_uses_key(flow_dissector,
 						FLOW_DISSECTOR_KEY_VLANID)) {
@@ -256,7 +257,7 @@ ipv6:
 		} *hdr, _hdr;
 		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 		if (!hdr)
-			return false;
+			goto out_bad;
 		proto = hdr->proto;
 		nhoff += PPPOE_SES_HLEN;
 		switch (proto) {
@@ -265,7 +266,7 @@ ipv6:
 		case htons(PPP_IPV6):
 			goto ipv6;
 		default:
-			return false;
+			goto out_bad;
 		}
 	}
 	case htons(ETH_P_TIPC): {
@@ -275,9 +276,7 @@ ipv6:
 		} *hdr, _hdr;
 		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 		if (!hdr)
-			return false;
-		key_basic->n_proto = proto;
-		key_control->thoff = (u16)nhoff;
+			goto out_bad;
 
 		if (skb_flow_dissector_uses_key(flow_dissector,
 						FLOW_DISSECTOR_KEY_TIPC_ADDRS)) {
@@ -287,7 +286,7 @@ ipv6:
 			key_addrs->tipcaddrs.srcnode = hdr->srcnode;
 			key_control->addr_type = FLOW_DISSECTOR_KEY_TIPC_ADDRS;
 		}
-		return true;
+		goto out_good;
 	}
 
 	case htons(ETH_P_MPLS_UC):
@@ -297,7 +296,7 @@ mpls:
 		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data,
 					   hlen, &_hdr);
 		if (!hdr)
-			return false;
+			goto out_bad;
 
 		if ((ntohl(hdr[0].entry) & MPLS_LS_LABEL_MASK) >>
 		     MPLS_LS_LABEL_SHIFT == MPLS_LABEL_ENTROPY) {
@@ -310,21 +309,17 @@ mpls:
 					htonl(MPLS_LS_LABEL_MASK);
 			}
 
-			key_basic->n_proto = proto;
-			key_basic->ip_proto = ip_proto;
-			key_control->thoff = (u16)nhoff;
-
-			return true;
+			goto out_good;
 		}
 
-		return true;
+		goto out_good;
 	}
 
 	case htons(ETH_P_FCOE):
 		key_control->thoff = (u16)(nhoff + FCOE_HEADER_LEN);
 		/* fall through */
 	default:
-		return false;
+		goto out_bad;
 	}
 
 ip_proto_again:
@@ -337,7 +332,7 @@ ip_proto_again:
 
 		hdr = __skb_header_pointer(skb, nhoff, sizeof(_hdr), data, hlen, &_hdr);
 		if (!hdr)
-			return false;
+			goto out_bad;
 		/*
 		 * Only look inside GRE if version zero and no
 		 * routing
@@ -357,7 +352,7 @@ ip_proto_again:
 						     data, hlen, &_keyid);
 
 			if (!keyid)
-				return false;
+				goto out_bad;
 
 			if (skb_flow_dissector_uses_key(flow_dissector,
 							FLOW_DISSECTOR_KEY_GRE_KEYID)) {
@@ -378,7 +373,7 @@ ip_proto_again:
 						   sizeof(_eth),
 						   data, hlen, &_eth);
 			if (!eth)
-				return false;
+				goto out_bad;
 			proto = eth->h_proto;
 			nhoff += sizeof(*eth);
 		}
@@ -395,7 +390,7 @@ ip_proto_again:
 		opthdr = __skb_header_pointer(skb, nhoff, sizeof(_opthdr),
 					      data, hlen, &_opthdr);
 		if (!opthdr)
-			return false;
+			goto out_bad;
 
 		ip_proto = opthdr[0];
 		nhoff += (opthdr[1] + 1) << 3;
@@ -415,10 +410,6 @@ ip_proto_again:
 		break;
 	}
 
-	key_basic->n_proto = proto;
-	key_basic->ip_proto = ip_proto;
-	key_control->thoff = (u16)nhoff;
-
 	if (skb_flow_dissector_uses_key(flow_dissector,
 					FLOW_DISSECTOR_KEY_PORTS)) {
 		key_ports = skb_flow_dissector_target(flow_dissector,
@@ -428,7 +419,15 @@ ip_proto_again:
 							data, hlen);
 	}
 
-	return true;
+out_good:
+	ret = true;
+
+out_bad:
+	key_basic->n_proto = proto;
+	key_basic->ip_proto = ip_proto;
+	key_control->thoff = (u16)nhoff;
+
+	return ret;
 }
 EXPORT_SYMBOL(__skb_flow_dissect);
 
-- 
1.8.1

  parent reply	other threads:[~2015-09-01 16:25 UTC|newest]

Thread overview: 13+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-09-01 16:24 [PATCH net-next 00/11] flow_dissector: Paramterize dissection and other features Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 01/11] flow_dissector: Move skb related functions to skbuff.h Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 02/11] skbuff: Make __skb_set_sw_hash a general function Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 03/11] flowi: Abstract out functions to get flow hash based on flowi Tom Herbert
2015-09-01 16:24 ` Tom Herbert [this message]
2015-09-01 16:24 ` [PATCH net-next 05/11] flow_dissector: Add flags argument to skb_flow_dissector functions Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 06/11] flow_dissector: Add control/reporting of fragmentation Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 07/11] flow_dissector: Support IPv6 fragment header Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 08/11] flow_dissector: Add flag to stop parsing at L3 Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 09/11] flow_dissector: Add flag to stop parsing when an IPv6 flow label is seen Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 10/11] flow_dissector: Add control/reporting of encapsulation Tom Herbert
2015-09-01 16:24 ` [PATCH net-next 11/11] flow_dissector: Ignore flow dissector return value from ___skb_get_hash Tom Herbert
2015-09-01 22:22 ` [PATCH net-next 00/11] flow_dissector: Paramterize dissection and other features David Miller

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