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msg: Populate the TLV list on receive.

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This patch changes the receive message parsing code to place each TLV
into the list.  A method is introduced that allows attaching TLVs to
the end of the list.

In addition, msg.last_tlv is converted into a pointer to the last item
in the list.  Because of this change, the transmit code that uses this
field now allocates a TLV before using it.

Signed-off-by: Richard Cochran <richardcochran@gmail.com>
This commit is contained in:
Richard Cochran 2018-02-07 19:58:39 +01:00
parent 22b894b687
commit 7fe69e7ba0
8 changed files with 83 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
clock.c
View File

@ -340,9 +340,17 @@ static int clock_management_fill_response(struct clock *c, struct port *p,
struct subscribe_events_np *sen;
struct management_tlv *tlv;
struct time_status_np *tsn;
struct tlv_extra *extra;
struct PTPText *text;
int datalen = 0;
extra = tlv_extra_alloc();
if (!extra) {
pr_err("failed to allocate TLV descriptor");
return 0;
}
extra->tlv = (struct TLV *) rsp->management.suffix;
tlv = (struct management_tlv *) rsp->management.suffix;
tlv->type = TLV_MANAGEMENT;
tlv->id = id;
@ -448,7 +456,7 @@ static int clock_management_fill_response(struct clock *c, struct port *p,
}
tlv->length = sizeof(tlv->id) + datalen;
rsp->header.messageLength += sizeof(*tlv) + datalen;
rsp->tlv_count = 1;
msg_tlv_attach(rsp, extra);
/* The caller can respond to this message. */
return 1;

53
msg.c
View File

@ -120,33 +120,43 @@ static void port_id_pre_send(struct PortIdentity *pid)
pid->portNumber = htons(pid->portNumber);
}
static int suffix_post_recv(uint8_t *ptr, int len, struct tlv_extra *last)
static int suffix_post_recv(struct ptp_message *msg, uint8_t *ptr, int len)
{
int cnt, err;
struct TLV *tlv;
struct tlv_extra *extra;
int err;
if (!ptr)
return 0;
for (cnt = 0; len > sizeof(struct TLV); cnt++) {
tlv = (struct TLV *) ptr;
tlv->type = ntohs(tlv->type);
tlv->length = ntohs(tlv->length);
if (tlv->length % 2) {
while (len > sizeof(struct TLV)) {
extra = tlv_extra_alloc();
if (!extra) {
pr_err("failed to allocate TLV descriptor");
return -ENOMEM;
}
extra->tlv = (struct TLV *) ptr;
extra->tlv->type = ntohs(extra->tlv->type);
extra->tlv->length = ntohs(extra->tlv->length);
if (extra->tlv->length % 2) {
tlv_extra_recycle(extra);
return -EBADMSG;
}
len -= sizeof(struct TLV);
ptr += sizeof(struct TLV);
if (tlv->length > len) {
if (extra->tlv->length > len) {
tlv_extra_recycle(extra);
return -EBADMSG;
}
len -= tlv->length;
ptr += tlv->length;
err = tlv_post_recv(tlv, len > sizeof(struct TLV) ? NULL : last);
if (err)
len -= extra->tlv->length;
ptr += extra->tlv->length;
err = tlv_post_recv(extra);
if (err) {
tlv_extra_recycle(extra);
return err;
}
return cnt;
msg_tlv_attach(msg, extra);
}
return 0;
}
static void suffix_pre_send(uint8_t *ptr, int cnt, struct tlv_extra *last)
@ -324,9 +334,9 @@ int msg_post_recv(struct ptp_message *m, int cnt)
if (msg_sots_missing(m))
return -ETIME;
m->tlv_count = suffix_post_recv(suffix, cnt - pdulen, &m->last_tlv);
if (m->tlv_count < 0)
return m->tlv_count;
err = suffix_post_recv(m, suffix, cnt - pdulen);
if (err)
return err;
return 0;
}
@ -381,10 +391,17 @@ int msg_pre_send(struct ptp_message *m)
default:
return -1;
}
suffix_pre_send(suffix, m->tlv_count, &m->last_tlv);
suffix_pre_send(suffix, m->tlv_count, m->last_tlv);
return 0;
}
void msg_tlv_attach(struct ptp_message *msg, struct tlv_extra *extra)
{
TAILQ_INSERT_TAIL(&msg->tlv_list, extra, list);
msg->tlv_count++;
msg->last_tlv = extra;
}
const char *msg_type_string(int type)
{
switch (type) {

10
msg.h
View File

@ -233,7 +233,7 @@ struct ptp_message {
* the layout of the TLV makes it difficult to access the data
* directly from the message's buffer.
*/
struct tlv_extra last_tlv;
struct tlv_extra *last_tlv;
};
/**
@ -258,6 +258,14 @@ static inline Boolean field_is_set(struct ptp_message *m, int index, Octet bit)
return m->header.flagField[index] & bit ? TRUE : FALSE;
}
/**
* Place a TLV descriptor into a message's list of TLVs.
*
* @param msg A message obtained using msg_allocate().
* @param extra The TLV to be added to the list.
*/
void msg_tlv_attach(struct ptp_message *msg, struct tlv_extra *extra);
/**
* Obtain the transportSpecific field from a message.
* @param m Message to test.

7
pmc.c
View File

@ -194,8 +194,10 @@ static void pmc_show(struct ptp_message *msg, FILE *fp)
struct time_status_np *tsn;
struct grandmaster_settings_np *gsn;
struct mgmt_clock_description *cd;
struct tlv_extra *extra;
struct portDS *p;
struct port_ds_np *pnp;
if (msg_type(msg) != MANAGEMENT) {
return;
}
@ -209,6 +211,7 @@ static void pmc_show(struct ptp_message *msg, FILE *fp)
if (msg->tlv_count != 1) {
goto out;
}
extra = TAILQ_FIRST(&msg->tlv_list);
tlv = (struct TLV *) msg->management.suffix;
if (tlv->type == TLV_MANAGEMENT) {
fprintf(fp, "MANAGEMENT ");
@ -226,7 +229,7 @@ static void pmc_show(struct ptp_message *msg, FILE *fp)
}
switch (mgt->id) {
case TLV_CLOCK_DESCRIPTION:
cd = &msg->last_tlv.cd;
cd = &extra->cd;
fprintf(fp, "CLOCK_DESCRIPTION "
IFMT "clockType 0x%hx"
IFMT "physicalLayerProtocol %s"
@ -252,7 +255,7 @@ static void pmc_show(struct ptp_message *msg, FILE *fp)
case TLV_USER_DESCRIPTION:
fprintf(fp, "USER_DESCRIPTION "
IFMT "userDescription %s",
text2str(msg->last_tlv.cd.userDescription));
text2str(extra->cd.userDescription));
break;
case TLV_DEFAULT_DATA_SET:
dds = (struct defaultDS *) mgt->data;

13
pmc_common.c
View File

@ -228,6 +228,8 @@ int pmc_send_get_action(struct pmc *pmc, int id)
int datalen, pdulen;
struct ptp_message *msg;
struct management_tlv *mgt;
struct tlv_extra *extra;
msg = pmc_message(pmc, GET);
if (!msg) {
return -1;
@ -239,14 +241,21 @@ int pmc_send_get_action(struct pmc *pmc, int id)
mgt->id = id;
pdulen = msg->header.messageLength + sizeof(*mgt) + datalen;
msg->header.messageLength = pdulen;
msg->tlv_count = 1;
extra = tlv_extra_alloc();
if (!extra) {
pr_err("failed to allocate TLV descriptor");
return -ENOMEM;
}
extra->tlv = (struct TLV *) msg->management.suffix;
msg_tlv_attach(msg, extra);
if (id == TLV_CLOCK_DESCRIPTION && !pmc->zero_length_gets) {
/*
* Make sure the tlv_extra pointers dereferenced in
* mgt_pre_send() do point to something.
*/
struct mgmt_clock_description *cd = &msg->last_tlv.cd;
struct mgmt_clock_description *cd = &extra->cd;
uint8_t *buf = mgt->data;
cd->clockType = (UInteger16 *) buf;
buf += sizeof(*cd->clockType);

12
port.c
View File

@ -711,11 +711,19 @@ static int port_management_fill_response(struct port *target,
struct port_properties_np *ppn;
struct management_tlv *tlv;
struct port_ds_np *pdsnp;
struct tlv_extra *extra;
struct portDS *pds;
uint16_t u16;
uint8_t *buf;
int datalen;
extra = tlv_extra_alloc();
if (!extra) {
pr_err("failed to allocate TLV descriptor");
return 0;
}
extra->tlv = (struct TLV *) rsp->management.suffix;
tlv = (struct management_tlv *) rsp->management.suffix;
tlv->type = TLV_MANAGEMENT;
tlv->id = id;
@ -725,7 +733,7 @@ static int port_management_fill_response(struct port *target,
datalen = 0;
break;
case TLV_CLOCK_DESCRIPTION:
cd = &rsp->last_tlv.cd;
cd = &extra->cd;
buf = tlv->data;
cd->clockType = (UInteger16 *) buf;
buf += sizeof(*cd->clockType);
@ -867,7 +875,7 @@ static int port_management_fill_response(struct port *target,
}
tlv->length = sizeof(tlv->id) + datalen;
rsp->header.messageLength += sizeof(*tlv) + datalen;
rsp->tlv_count = 1;
msg_tlv_attach(rsp, extra);
/* The caller can respond to this message. */
return 1;

6
tlv.c
View File

@ -444,15 +444,13 @@ void tlv_extra_recycle(struct tlv_extra *extra)
TAILQ_INSERT_HEAD(&tlv_pool, extra, list);
}
int tlv_post_recv(struct TLV *tlv, struct tlv_extra *extra)
int tlv_post_recv(struct tlv_extra *extra)
{
int result = 0;
struct management_tlv *mgt;
struct management_error_status *mes;
struct TLV *tlv = extra->tlv;
struct path_trace_tlv *ptt;
struct tlv_extra dummy_extra;
if (!extra)
extra = &dummy_extra;
switch (tlv->type) {
case TLV_MANAGEMENT:

6
tlv.h
View File

@ -256,12 +256,10 @@ void tlv_extra_recycle(struct tlv_extra *extra);
/**
* Converts recognized value sub-fields into host byte order.
* @param tlv Pointer to a Type Length Value field.
* @param extra Additional struct where data from tlv will be saved,
* can be NULL.
* @param extra TLV descriptor pointing to the protocol data.
* @return Zero if successful, otherwise non-zero
*/
int tlv_post_recv(struct TLV *tlv, struct tlv_extra *extra);
int tlv_post_recv(struct tlv_extra *extra);
/**
* Converts recognized value sub-fields into network byte order.