From be61331d902e63011138723da3f737d34506f797 Mon Sep 17 00:00:00 2001 From: Bhanu Prakash Gollapudi Date: Fri, 11 Jun 2010 16:44:36 -0700 Subject: [SCSI] libfcoe: Check for order and missing critical descriptors for FIP ELS requests As per FC-BB-5 rev.2, section 7.8.7.1, strict ordering of FIP descriptors is required for ELS requests. Also, look for missing and duplicate critical descriptors. Signed-off-by: Bhanu Prakash Gollapudi Signed-off-by: Robert Love Signed-off-by: James Bottomley --- drivers/scsi/fcoe/libfcoe.c | 31 ++++++++++++++++++++++++++++--- 1 file changed, 28 insertions(+), 3 deletions(-) diff --git a/drivers/scsi/fcoe/libfcoe.c b/drivers/scsi/fcoe/libfcoe.c index ce651ca2a4bc..f009191063f1 100644 --- a/drivers/scsi/fcoe/libfcoe.c +++ b/drivers/scsi/fcoe/libfcoe.c @@ -871,7 +871,8 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) size_t els_len = 0; size_t rlen; size_t dlen; - u32 dupl_desc = 0; + u32 desc_mask = 0; + u32 desc_cnt = 0; fiph = (struct fip_header *)skb->data; sub = fiph->fip_subcode; @@ -884,20 +885,27 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) desc = (struct fip_desc *)(fiph + 1); while (rlen > 0) { + desc_cnt++; dlen = desc->fip_dlen * FIP_BPW; if (dlen < sizeof(*desc) || dlen > rlen) goto drop; /* Drop ELS if there are duplicate critical descriptors */ if (desc->fip_dtype < 32) { - if (dupl_desc & 1U << desc->fip_dtype) { + if (desc_mask & 1U << desc->fip_dtype) { LIBFCOE_FIP_DBG(fip, "Duplicate Critical " "Descriptors in FIP ELS\n"); goto drop; } - dupl_desc |= (1 << desc->fip_dtype); + desc_mask |= (1 << desc->fip_dtype); } switch (desc->fip_dtype) { case FIP_DT_MAC: + if (desc_cnt == 1) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } + if (dlen != sizeof(struct fip_mac_desc)) goto len_err; memcpy(granted_mac, @@ -914,6 +922,11 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) case FIP_DT_FDISC: case FIP_DT_LOGO: case FIP_DT_ELP: + if (desc_cnt != 1) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } if (fh) goto drop; if (dlen < sizeof(*els) + sizeof(*fh) + 1) @@ -929,6 +942,11 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) /* standard says ignore unknown descriptors >= 128 */ if (desc->fip_dtype < FIP_DT_VENDOR_BASE) goto drop; + if (desc_cnt <= 2) { + LIBFCOE_FIP_DBG(fip, "FIP descriptors " + "received out of order\n"); + goto drop; + } break; } desc = (struct fip_desc *)((char *)desc + dlen); @@ -944,6 +962,13 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb) els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac)) fip->flogi_oxid = FC_XID_UNKNOWN; + if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) && + (!(1U << FIP_DT_MAC & desc_mask)))) { + LIBFCOE_FIP_DBG(fip, "Missing critical descriptors " + "in FIP ELS\n"); + goto drop; + } + /* * Convert skb into an fc_frame containing only the ELS. */ -- cgit v1.2.2