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-rw-r--r--drivers/scsi/iscsi_tcp.c16
-rw-r--r--drivers/scsi/iscsi_tcp.h13
-rw-r--r--drivers/scsi/libiscsi.c41
3 files changed, 54 insertions, 16 deletions
diff --git a/drivers/scsi/iscsi_tcp.c b/drivers/scsi/iscsi_tcp.c
index fd88777df28b..491845f18710 100644
--- a/drivers/scsi/iscsi_tcp.c
+++ b/drivers/scsi/iscsi_tcp.c
@@ -113,7 +113,7 @@ iscsi_hdr_digest(struct iscsi_conn *conn, struct iscsi_buf *buf,
struct iscsi_tcp_conn *tcp_conn = conn->dd_data;
crypto_hash_digest(&tcp_conn->tx_hash, &buf->sg, buf->sg.length, crc);
- buf->sg.length += sizeof(u32);
+ buf->sg.length += ISCSI_DIGEST_SIZE;
}
/*
@@ -220,6 +220,7 @@ static inline int
iscsi_tcp_chunk_done(struct iscsi_chunk *chunk)
{
static unsigned char padbuf[ISCSI_PAD_LEN];
+ unsigned int pad;
if (chunk->copied < chunk->size) {
iscsi_tcp_chunk_map(chunk);
@@ -243,10 +244,8 @@ iscsi_tcp_chunk_done(struct iscsi_chunk *chunk)
}
/* Do we need to handle padding? */
- if (chunk->total_copied & (ISCSI_PAD_LEN-1)) {
- unsigned int pad;
-
- pad = ISCSI_PAD_LEN - (chunk->total_copied & (ISCSI_PAD_LEN-1));
+ pad = iscsi_padding(chunk->total_copied);
+ if (pad != 0) {
debug_tcp("consume %d pad bytes\n", pad);
chunk->total_size += pad;
chunk->size = pad;
@@ -1385,11 +1384,11 @@ iscsi_send_cmd_hdr(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask)
}
iscsi_buf_init_iov(&tcp_ctask->headbuf, (char*)ctask->hdr,
- sizeof(struct iscsi_hdr));
+ ctask->hdr_len);
if (conn->hdrdgst_en)
iscsi_hdr_digest(conn, &tcp_ctask->headbuf,
- (u8*)tcp_ctask->hdrext);
+ iscsi_next_hdr(ctask));
tcp_ctask->xmstate &= ~XMSTATE_CMD_HDR_INIT;
tcp_ctask->xmstate |= XMSTATE_CMD_HDR_XMIT;
}
@@ -2176,7 +2175,8 @@ iscsi_tcp_session_create(struct iscsi_transport *iscsit,
struct iscsi_cmd_task *ctask = session->cmds[cmd_i];
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
- ctask->hdr = &tcp_ctask->hdr;
+ ctask->hdr = &tcp_ctask->hdr.cmd_hdr;
+ ctask->hdr_max = sizeof(tcp_ctask->hdr) - ISCSI_DIGEST_SIZE;
}
for (cmd_i = 0; cmd_i < session->mgmtpool_max; cmd_i++) {
diff --git a/drivers/scsi/iscsi_tcp.h b/drivers/scsi/iscsi_tcp.h
index f1c541151100..eb3784f949fd 100644
--- a/drivers/scsi/iscsi_tcp.h
+++ b/drivers/scsi/iscsi_tcp.h
@@ -41,7 +41,6 @@
#define XMSTATE_IMM_HDR_INIT 0x1000
#define XMSTATE_SOL_HDR_INIT 0x2000
-#define ISCSI_PAD_LEN 4
#define ISCSI_SG_TABLESIZE SG_ALL
#define ISCSI_TCP_MAX_CMD_LEN 16
@@ -130,14 +129,14 @@ struct iscsi_buf {
struct iscsi_data_task {
struct iscsi_data hdr; /* PDU */
- char hdrext[sizeof(__u32)]; /* Header-Digest */
+ char hdrext[ISCSI_DIGEST_SIZE];/* Header-Digest */
struct iscsi_buf digestbuf; /* digest buffer */
uint32_t digest; /* data digest */
};
struct iscsi_tcp_mgmt_task {
struct iscsi_hdr hdr;
- char hdrext[sizeof(__u32)]; /* Header-Digest */
+ char hdrext[ISCSI_DIGEST_SIZE]; /* Header-Digest */
int xmstate; /* mgmt xmit progress */
struct iscsi_buf headbuf; /* header buffer */
struct iscsi_buf sendbuf; /* in progress buffer */
@@ -159,9 +158,11 @@ struct iscsi_r2t_info {
};
struct iscsi_tcp_cmd_task {
- struct iscsi_cmd hdr;
- char hdrext[4*sizeof(__u16)+ /* AHS */
- sizeof(__u32)]; /* HeaderDigest */
+ struct iscsi_hdr_buff {
+ struct iscsi_cmd cmd_hdr;
+ char hdrextbuf[ISCSI_MAX_AHS_SIZE +
+ ISCSI_DIGEST_SIZE];
+ } hdr;
char pad[ISCSI_PAD_LEN];
int pad_count; /* padded bytes */
struct iscsi_buf headbuf; /* header buf (xmit) */
diff --git a/drivers/scsi/libiscsi.c b/drivers/scsi/libiscsi.c
index 0beb4c620962..0d7914fd8ef3 100644
--- a/drivers/scsi/libiscsi.c
+++ b/drivers/scsi/libiscsi.c
@@ -37,6 +37,9 @@
#include <scsi/scsi_transport_iscsi.h>
#include <scsi/libiscsi.h>
+static void fail_command(struct iscsi_conn *conn, struct iscsi_cmd_task *ctask,
+ int err);
+
struct iscsi_session *
class_to_transport_session(struct iscsi_cls_session *cls_session)
{
@@ -122,6 +125,20 @@ void iscsi_prep_unsolicit_data_pdu(struct iscsi_cmd_task *ctask,
}
EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
+static int iscsi_add_hdr(struct iscsi_cmd_task *ctask, unsigned len)
+{
+ unsigned exp_len = ctask->hdr_len + len;
+
+ if (exp_len > ctask->hdr_max) {
+ WARN_ON(1);
+ return -EINVAL;
+ }
+
+ WARN_ON(len & (ISCSI_PAD_LEN - 1)); /* caller must pad the AHS */
+ ctask->hdr_len = exp_len;
+ return 0;
+}
+
/**
* iscsi_prep_scsi_cmd_pdu - prep iscsi scsi cmd pdu
* @ctask: iscsi cmd task
@@ -129,13 +146,19 @@ EXPORT_SYMBOL_GPL(iscsi_prep_unsolicit_data_pdu);
* Prep basic iSCSI PDU fields for a scsi cmd pdu. The LLD should set
* fields like dlength or final based on how much data it sends
*/
-static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
+static int iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
{
struct iscsi_conn *conn = ctask->conn;
struct iscsi_session *session = conn->session;
struct iscsi_cmd *hdr = ctask->hdr;
struct scsi_cmnd *sc = ctask->sc;
+ unsigned hdrlength;
+ int rc;
+ ctask->hdr_len = 0;
+ rc = iscsi_add_hdr(ctask, sizeof(*hdr));
+ if (rc)
+ return rc;
hdr->opcode = ISCSI_OP_SCSI_CMD;
hdr->flags = ISCSI_ATTR_SIMPLE;
int_to_scsilun(sc->device->lun, (struct scsi_lun *)hdr->lun);
@@ -199,6 +222,15 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
hdr->flags |= ISCSI_FLAG_CMD_READ;
}
+ /* calculate size of additional header segments (AHSs) */
+ hdrlength = ctask->hdr_len - sizeof(*hdr);
+
+ WARN_ON(hdrlength & (ISCSI_PAD_LEN-1));
+ hdrlength /= ISCSI_PAD_LEN;
+
+ WARN_ON(hdrlength >= 256);
+ hdr->hlength = hdrlength & 0xFF;
+
conn->scsicmd_pdus_cnt++;
debug_scsi("iscsi prep [%s cid %d sc %p cdb 0x%x itt 0x%x len %d "
@@ -206,6 +238,7 @@ static void iscsi_prep_scsi_cmd_pdu(struct iscsi_cmd_task *ctask)
sc->sc_data_direction == DMA_TO_DEVICE ? "write" : "read",
conn->id, sc, sc->cmnd[0], ctask->itt, scsi_bufflen(sc),
session->cmdsn, session->max_cmdsn - session->exp_cmdsn + 1);
+ return 0;
}
/**
@@ -744,7 +777,10 @@ check_mgmt:
conn->ctask = list_entry(conn->xmitqueue.next,
struct iscsi_cmd_task, running);
- iscsi_prep_scsi_cmd_pdu(conn->ctask);
+ if (iscsi_prep_scsi_cmd_pdu(conn->ctask)) {
+ fail_command(conn, conn->ctask, DID_ABORT << 16);
+ continue;
+ }
conn->session->tt->init_cmd_task(conn->ctask);
conn->ctask->state = ISCSI_TASK_RUNNING;
list_move_tail(conn->xmitqueue.next, &conn->run_list);
@@ -1534,6 +1570,7 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
if (cmd_task_size)
ctask->dd_data = &ctask[1];
ctask->itt = cmd_i;
+ ctask->hdr_max = sizeof(struct iscsi_cmd);
INIT_LIST_HEAD(&ctask->running);
}
generated by cgit v1.2.3 (git 2.0.4) at 2024-11-18 08:20:02 +0000