[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 <bprakash@broadcom.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
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@ -871,7 +871,8 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
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size_t els_len = 0;
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size_t els_len = 0;
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size_t rlen;
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size_t rlen;
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size_t dlen;
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size_t dlen;
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u32 dupl_desc = 0;
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u32 desc_mask = 0;
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u32 desc_cnt = 0;
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fiph = (struct fip_header *)skb->data;
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fiph = (struct fip_header *)skb->data;
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sub = fiph->fip_subcode;
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sub = fiph->fip_subcode;
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@ -884,20 +885,27 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
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desc = (struct fip_desc *)(fiph + 1);
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desc = (struct fip_desc *)(fiph + 1);
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while (rlen > 0) {
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while (rlen > 0) {
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desc_cnt++;
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dlen = desc->fip_dlen * FIP_BPW;
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dlen = desc->fip_dlen * FIP_BPW;
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if (dlen < sizeof(*desc) || dlen > rlen)
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if (dlen < sizeof(*desc) || dlen > rlen)
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goto drop;
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goto drop;
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/* Drop ELS if there are duplicate critical descriptors */
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/* Drop ELS if there are duplicate critical descriptors */
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if (desc->fip_dtype < 32) {
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if (desc->fip_dtype < 32) {
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if (dupl_desc & 1U << desc->fip_dtype) {
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if (desc_mask & 1U << desc->fip_dtype) {
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LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
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LIBFCOE_FIP_DBG(fip, "Duplicate Critical "
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"Descriptors in FIP ELS\n");
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"Descriptors in FIP ELS\n");
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goto drop;
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goto drop;
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}
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}
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dupl_desc |= (1 << desc->fip_dtype);
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desc_mask |= (1 << desc->fip_dtype);
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}
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}
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switch (desc->fip_dtype) {
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switch (desc->fip_dtype) {
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case FIP_DT_MAC:
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case FIP_DT_MAC:
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if (desc_cnt == 1) {
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LIBFCOE_FIP_DBG(fip, "FIP descriptors "
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"received out of order\n");
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goto drop;
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}
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if (dlen != sizeof(struct fip_mac_desc))
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if (dlen != sizeof(struct fip_mac_desc))
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goto len_err;
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goto len_err;
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memcpy(granted_mac,
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memcpy(granted_mac,
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@ -914,6 +922,11 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
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case FIP_DT_FDISC:
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case FIP_DT_FDISC:
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case FIP_DT_LOGO:
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case FIP_DT_LOGO:
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case FIP_DT_ELP:
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case FIP_DT_ELP:
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if (desc_cnt != 1) {
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LIBFCOE_FIP_DBG(fip, "FIP descriptors "
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"received out of order\n");
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goto drop;
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}
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if (fh)
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if (fh)
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goto drop;
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goto drop;
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if (dlen < sizeof(*els) + sizeof(*fh) + 1)
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if (dlen < sizeof(*els) + sizeof(*fh) + 1)
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@ -929,6 +942,11 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
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/* standard says ignore unknown descriptors >= 128 */
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/* standard says ignore unknown descriptors >= 128 */
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if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
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if (desc->fip_dtype < FIP_DT_VENDOR_BASE)
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goto drop;
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goto drop;
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if (desc_cnt <= 2) {
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LIBFCOE_FIP_DBG(fip, "FIP descriptors "
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"received out of order\n");
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goto drop;
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}
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break;
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break;
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}
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}
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desc = (struct fip_desc *)((char *)desc + dlen);
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desc = (struct fip_desc *)((char *)desc + dlen);
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@ -944,6 +962,13 @@ static void fcoe_ctlr_recv_els(struct fcoe_ctlr *fip, struct sk_buff *skb)
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els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac))
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els_op == ELS_LS_ACC && is_valid_ether_addr(granted_mac))
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fip->flogi_oxid = FC_XID_UNKNOWN;
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fip->flogi_oxid = FC_XID_UNKNOWN;
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if ((desc_cnt == 0) || ((els_op != ELS_LS_RJT) &&
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(!(1U << FIP_DT_MAC & desc_mask)))) {
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LIBFCOE_FIP_DBG(fip, "Missing critical descriptors "
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"in FIP ELS\n");
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goto drop;
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}
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/*
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/*
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* Convert skb into an fc_frame containing only the ELS.
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* Convert skb into an fc_frame containing only the ELS.
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*/
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*/
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