Messages in this thread Patch in this message | | | Date | Sun, 05 Feb 2012 23:11:04 +0100 | From | Willy Tarreau <> | Subject | [PATCH 75/91] [PATCH] bonding: correctly process non-linear skbs |
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2.6.27-longterm review patch. If anyone has any objections, please let us know.
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commit ab12811c89e88f2e66746790b1fe4469ccb7bdd9 upstream.
It was recently brought to my attention that 802.3ad mode bonds would no longer form when using some network hardware after a driver update. After snooping around I realized that the particular hardware was using page-based skbs and found that skb->data did not contain a valid LACPDU as it was not stored there. That explained the inability to form an 802.3ad-based bond. For balance-alb mode bonds this was also an issue as ARPs would not be properly processed.
This patch fixes the issue in my tests and should be applied to 2.6.36 and as far back as anyone cares to add it to stable.
Thanks to Alexander Duyck <alexander.h.duyck@intel.com> and Jesse Brandeburg <jesse.brandeburg@intel.com> for the suggestions on this one.
Signed-off-by: Andy Gospodarek <andy@greyhouse.net> CC: Alexander Duyck <alexander.h.duyck@intel.com> CC: Jesse Brandeburg <jesse.brandeburg@intel.com> Signed-off-by: Jay Vosburgh <fubar@us.ibm.com> Signed-off-by: David S. Miller <davem@davemloft.net> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> --- drivers/net/bonding/bond_3ad.c | 3 +++ drivers/net/bonding/bond_alb.c | 3 +++ 2 files changed, 6 insertions(+), 0 deletions(-)
Index: longterm-2.6.27/drivers/net/bonding/bond_3ad.c =================================================================== --- longterm-2.6.27.orig/drivers/net/bonding/bond_3ad.c 2012-02-05 22:34:32.729915391 +0100 +++ longterm-2.6.27/drivers/net/bonding/bond_3ad.c 2012-02-05 22:34:45.523916489 +0100 @@ -2436,6 +2436,9 @@ if (!(dev->flags & IFF_MASTER)) goto out; + if (!pskb_may_pull(skb, sizeof(struct lacpdu))) + goto out; + read_lock(&bond->lock); slave = bond_get_slave_by_dev((struct bonding *)dev->priv, orig_dev); if (!slave) Index: longterm-2.6.27/drivers/net/bonding/bond_alb.c =================================================================== --- longterm-2.6.27.orig/drivers/net/bonding/bond_alb.c 2012-02-05 22:34:32.733915045 +0100 +++ longterm-2.6.27/drivers/net/bonding/bond_alb.c 2012-02-05 22:34:45.528915452 +0100 @@ -359,6 +359,9 @@ goto out; } + if (!pskb_may_pull(skb, arp_hdr_len(bond_dev))) + goto out; + if (skb->len < sizeof(struct arp_pkt)) { dprintk("Packet is too small to be an ARP\n"); goto out;
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