Messages in this thread Patch in this message | | | From | Kumar Thangavel <> | Date | Tue, 12 Oct 2021 11:52:40 +0530 | Subject | [PATCH] net: ncsi: Adding padding bytes in the payload |
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Update NC-SI command handler (both standard and OEM) to take into account of payload paddings in allocating skb (in case of payload size is not 32-bit aligned).
The checksum field follows payload field, without taking payload padding into account can cause checksum being truncated, leading to dropped packets.
Signed-off-by: Kumar Thangavel <thangavel.k@hcl.com>
--- net/ncsi/ncsi-cmd.c | 21 +++++++++++++++++---- 1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/net/ncsi/ncsi-cmd.c b/net/ncsi/ncsi-cmd.c index ba9ae482141b..4625fc935603 100644 --- a/net/ncsi/ncsi-cmd.c +++ b/net/ncsi/ncsi-cmd.c @@ -214,11 +214,19 @@ static int ncsi_cmd_handler_oem(struct sk_buff *skb, struct ncsi_cmd_oem_pkt *cmd; unsigned int len; + /* NC-SI spec requires payload to be padded with 0 + * to 32-bit boundary before the checksum field. + * Ensure the padding bytes are accounted for in + * skb allocation + */ + + unsigned short payload = ALIGN(nca->payload, 4); + len = sizeof(struct ncsi_cmd_pkt_hdr) + 4; - if (nca->payload < 26) + if (payload < 26) len += 26; else - len += nca->payload; + len += payload; cmd = skb_put_zero(skb, len); memcpy(&cmd->mfr_id, nca->data, nca->payload); @@ -272,6 +280,7 @@ static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca) struct net_device *dev = nd->dev; int hlen = LL_RESERVED_SPACE(dev); int tlen = dev->needed_tailroom; + int payload; int len = hlen + tlen; struct sk_buff *skb; struct ncsi_request *nr; @@ -281,14 +290,18 @@ static struct ncsi_request *ncsi_alloc_command(struct ncsi_cmd_arg *nca) return NULL; /* NCSI command packet has 16-bytes header, payload, 4 bytes checksum. + * Payload needs padding so that the checksum field follwoing payload is + * aligned to 32bit boundary. * The packet needs padding if its payload is less than 26 bytes to * meet 64 bytes minimal ethernet frame length. */ len += sizeof(struct ncsi_cmd_pkt_hdr) + 4; - if (nca->payload < 26) + + payload = ALIGN(nca->payload, 4); + if (payload < 26) len += 26; else - len += nca->payload; + len += payload; /* Allocate skb */ skb = alloc_skb(len, GFP_ATOMIC); -- 2.17.1
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