[SCSI] libfc: recode incoming PRLI handling
Reduce indentation in fc_rport_recv_prli_req() using gotos. Also add payload length checks. Signed-off-by: Joe Eykholt <jeykholt@cisco.com> Signed-off-by: Robert Love <robert.w.love@intel.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
James Bottomley
parent
fc193172e6
commit
a2f6a024e1
@ -1442,136 +1442,115 @@ static void fc_rport_recv_prli_req(struct fc_rport_priv *rdata,
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struct fc_els_spp *spp; /* response spp */
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unsigned int len;
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unsigned int plen;
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enum fc_els_rjt_reason reason = ELS_RJT_UNAB;
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enum fc_els_rjt_explan explan = ELS_EXPL_NONE;
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enum fc_els_spp_resp resp;
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struct fc_seq_els_data rjt_data;
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u32 f_ctl;
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u32 fcp_parm;
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u32 roles = FC_RPORT_ROLE_UNKNOWN;
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rjt_data.fp = NULL;
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rjt_data.fp = NULL;
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fh = fc_frame_header_get(rx_fp);
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FC_RPORT_DBG(rdata, "Received PRLI request while in state %s\n",
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fc_rport_state(rdata));
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switch (rdata->rp_state) {
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case RPORT_ST_PRLI:
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case RPORT_ST_RTV:
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case RPORT_ST_READY:
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case RPORT_ST_ADISC:
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reason = ELS_RJT_NONE;
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break;
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default:
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fc_frame_free(rx_fp);
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return;
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break;
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}
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len = fr_len(rx_fp) - sizeof(*fh);
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pp = fc_frame_payload_get(rx_fp, sizeof(*pp));
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if (pp == NULL) {
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reason = ELS_RJT_PROT;
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explan = ELS_EXPL_INV_LEN;
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} else {
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plen = ntohs(pp->prli.prli_len);
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if ((plen % 4) != 0 || plen > len) {
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reason = ELS_RJT_PROT;
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explan = ELS_EXPL_INV_LEN;
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} else if (plen < len) {
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len = plen;
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}
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plen = pp->prli.prli_spp_len;
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if ((plen % 4) != 0 || plen < sizeof(*spp) ||
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plen > len || len < sizeof(*pp)) {
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reason = ELS_RJT_PROT;
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explan = ELS_EXPL_INV_LEN;
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}
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rspp = &pp->spp;
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if (!pp)
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goto reject_len;
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plen = ntohs(pp->prli.prli_len);
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if ((plen % 4) != 0 || plen > len || plen < 16)
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goto reject_len;
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if (plen < len)
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len = plen;
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plen = pp->prli.prli_spp_len;
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if ((plen % 4) != 0 || plen < sizeof(*spp) ||
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plen > len || len < sizeof(*pp) || plen < 12)
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goto reject_len;
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rspp = &pp->spp;
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fp = fc_frame_alloc(lport, len);
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if (!fp) {
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rjt_data.reason = ELS_RJT_UNAB;
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rjt_data.explan = ELS_EXPL_INSUF_RES;
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goto reject;
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}
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if (reason != ELS_RJT_NONE ||
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(fp = fc_frame_alloc(lport, len)) == NULL) {
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rjt_data.reason = reason;
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rjt_data.explan = explan;
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lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
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} else {
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sp = lport->tt.seq_start_next(sp);
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WARN_ON(!sp);
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pp = fc_frame_payload_get(fp, len);
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WARN_ON(!pp);
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memset(pp, 0, len);
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pp->prli.prli_cmd = ELS_LS_ACC;
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pp->prli.prli_spp_len = plen;
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pp->prli.prli_len = htons(len);
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len -= sizeof(struct fc_els_prli);
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sp = lport->tt.seq_start_next(sp);
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WARN_ON(!sp);
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pp = fc_frame_payload_get(fp, len);
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WARN_ON(!pp);
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memset(pp, 0, len);
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pp->prli.prli_cmd = ELS_LS_ACC;
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pp->prli.prli_spp_len = plen;
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pp->prli.prli_len = htons(len);
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len -= sizeof(struct fc_els_prli);
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/* reinitialize remote port roles */
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rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
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/* reinitialize remote port roles */
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rdata->ids.roles = FC_RPORT_ROLE_UNKNOWN;
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/*
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* Go through all the service parameter pages and build
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* response. If plen indicates longer SPP than standard,
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* use that. The entire response has been pre-cleared above.
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*/
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spp = &pp->spp;
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while (len >= plen) {
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spp->spp_type = rspp->spp_type;
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spp->spp_type_ext = rspp->spp_type_ext;
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spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
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resp = FC_SPP_RESP_ACK;
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if (rspp->spp_flags & FC_SPP_RPA_VAL)
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resp = FC_SPP_RESP_NO_PA;
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switch (rspp->spp_type) {
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case 0: /* common to all FC-4 types */
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break;
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case FC_TYPE_FCP:
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fcp_parm = ntohl(rspp->spp_params);
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if (fcp_parm & FCP_SPPF_RETRY)
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rdata->flags |= FC_RP_FLAGS_RETRY;
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rdata->supported_classes = FC_COS_CLASS3;
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if (fcp_parm & FCP_SPPF_INIT_FCN)
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roles |= FC_RPORT_ROLE_FCP_INITIATOR;
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if (fcp_parm & FCP_SPPF_TARG_FCN)
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roles |= FC_RPORT_ROLE_FCP_TARGET;
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rdata->ids.roles = roles;
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/*
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* Go through all the service parameter pages and build
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* response. If plen indicates longer SPP than standard,
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* use that. The entire response has been pre-cleared above.
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*/
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spp = &pp->spp;
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while (len >= plen) {
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spp->spp_type = rspp->spp_type;
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spp->spp_type_ext = rspp->spp_type_ext;
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spp->spp_flags = rspp->spp_flags & FC_SPP_EST_IMG_PAIR;
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resp = FC_SPP_RESP_ACK;
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spp->spp_params =
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htonl(lport->service_params);
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break;
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default:
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resp = FC_SPP_RESP_INVL;
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break;
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}
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spp->spp_flags |= resp;
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len -= plen;
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rspp = (struct fc_els_spp *)((char *)rspp + plen);
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spp = (struct fc_els_spp *)((char *)spp + plen);
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}
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/*
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* Send LS_ACC. If this fails, the originator should retry.
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*/
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f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
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f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
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ep = fc_seq_exch(sp);
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fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
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FC_TYPE_ELS, f_ctl, 0);
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lport->tt.seq_send(lport, sp, fp);
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/*
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* Get lock and re-check state.
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*/
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switch (rdata->rp_state) {
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case RPORT_ST_PRLI:
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fc_rport_enter_ready(rdata);
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switch (rspp->spp_type) {
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case 0: /* common to all FC-4 types */
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break;
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case RPORT_ST_READY:
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case RPORT_ST_ADISC:
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case FC_TYPE_FCP:
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fcp_parm = ntohl(rspp->spp_params);
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if (fcp_parm & FCP_SPPF_RETRY)
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rdata->flags |= FC_RP_FLAGS_RETRY;
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rdata->supported_classes = FC_COS_CLASS3;
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if (fcp_parm & FCP_SPPF_INIT_FCN)
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roles |= FC_RPORT_ROLE_FCP_INITIATOR;
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if (fcp_parm & FCP_SPPF_TARG_FCN)
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roles |= FC_RPORT_ROLE_FCP_TARGET;
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rdata->ids.roles = roles;
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spp->spp_params = htonl(lport->service_params);
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break;
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default:
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resp = FC_SPP_RESP_INVL;
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break;
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}
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spp->spp_flags |= resp;
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len -= plen;
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rspp = (struct fc_els_spp *)((char *)rspp + plen);
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spp = (struct fc_els_spp *)((char *)spp + plen);
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}
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/*
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* Send LS_ACC. If this fails, the originator should retry.
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*/
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f_ctl = FC_FC_EX_CTX | FC_FC_LAST_SEQ;
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f_ctl |= FC_FC_END_SEQ | FC_FC_SEQ_INIT;
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ep = fc_seq_exch(sp);
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fc_fill_fc_hdr(fp, FC_RCTL_ELS_REP, ep->did, ep->sid,
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FC_TYPE_ELS, f_ctl, 0);
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lport->tt.seq_send(lport, sp, fp);
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switch (rdata->rp_state) {
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case RPORT_ST_PRLI:
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fc_rport_enter_ready(rdata);
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break;
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default:
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break;
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}
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goto drop;
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reject_len:
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rjt_data.reason = ELS_RJT_PROT;
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rjt_data.explan = ELS_EXPL_INV_LEN;
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reject:
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lport->tt.seq_els_rsp_send(sp, ELS_LS_RJT, &rjt_data);
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drop:
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fc_frame_free(rx_fp);
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}
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