netdev - [PATCH net-next v2 3/7] iavf: Don't do TX csum offload with routing header present

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20240701195507.256374-4-tom@herbertland.com>
Date: Mon,  1 Jul 2024 12:55:03 -0700
From: Tom Herbert <tom@...bertland.com>
To: davem@...emloft.net,
	kuba@...nel.org,
	jesse.brandeburg@...el.com,
	anthony.l.nguyen@...el.com,
	cai.huoqing@...ux.dev,
	netdev@...r.kernel.org,
	felipe@...anda.io,
	justin.iurman@...ege.be
Cc: Tom Herbert <tom@...bertland.com>
Subject: [PATCH net-next v2 3/7] iavf: Don't do TX csum offload with routing header present

When determining if the L4 checksum in an IPv6 packet can be offloaded
on transmit, call ipv6_skip_exthdr_no_rthdr to check for the presence
of a routing header. If a routing header is present, that is the
function return less than zero, then don't offload checksum and call
skb_checksum_help instead.

Signed-off-by: Tom Herbert <tom@...bertland.com>
---
 drivers/net/ethernet/intel/iavf/iavf_txrx.c | 20 ++++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/drivers/net/ethernet/intel/iavf/iavf_txrx.c b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
index 26b424fd6718..44cad541bed4 100644
--- a/drivers/net/ethernet/intel/iavf/iavf_txrx.c
+++ b/drivers/net/ethernet/intel/iavf/iavf_txrx.c
@@ -1651,9 +1651,10 @@ static int iavf_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 			exthdr = ip.hdr + sizeof(*ip.v6);
 			l4_proto = ip.v6->nexthdr;
-			if (l4.hdr != exthdr)
-				ipv6_skip_exthdr(skb, exthdr - skb->data,
-						 &l4_proto, &frag_off);
+			if (l4.hdr != exthdr &&
+			    ipv6_skip_exthdr_no_rthdr(skb, exthdr - skb->data,
+						      &l4_proto, &frag_off) < 0)
+				goto no_csum_offload;
 		}
 
 		/* define outer transport */
@@ -1672,6 +1673,7 @@ static int iavf_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 			l4.hdr = skb_inner_network_header(skb);
 			break;
 		default:
+no_csum_offload:
 			if (*tx_flags & IAVF_TX_FLAGS_TSO)
 				return -1;
 
@@ -1725,9 +1727,10 @@ static int iavf_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 
 		exthdr = ip.hdr + sizeof(*ip.v6);
 		l4_proto = ip.v6->nexthdr;
-		if (l4.hdr != exthdr)
-			ipv6_skip_exthdr(skb, exthdr - skb->data,
-					 &l4_proto, &frag_off);
+		if (l4.hdr != exthdr &&
+		    ipv6_skip_exthdr_no_rthdr(skb, exthdr - skb->data,
+					      &l4_proto, &frag_off) < 0)
+			goto no_csum_offload;
 	}
 
 	/* compute inner L3 header size */
@@ -1753,10 +1756,7 @@ static int iavf_tx_enable_csum(struct sk_buff *skb, u32 *tx_flags,
 			  IAVF_TX_DESC_LENGTH_L4_FC_LEN_SHIFT;
 		break;
 	default:
-		if (*tx_flags & IAVF_TX_FLAGS_TSO)
-			return -1;
-		skb_checksum_help(skb);
-		return 0;
+		goto no_csum_offload;
 	}
 
 	*td_cmd |= cmd;
-- 
2.34.1