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*: revise zapi nexthop encoding

Browse Source 
Use a per-nexthop flag to indicate the presence of labels; add
some utility zapi encode/decode apis for nexthops; use the zapi
apis more consistently.

Signed-off-by: Mark Stapp <mjs@voltanet.io>
This commit is contained in:
Mark Stapp 2019-11-13 16:06:06 -05:00
parent d3d77ec42f
commit 68a02e06e5
7 changed files with 209 additions and 180 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
bgpd/bgp_zebra.c
View File

@ -1072,7 +1072,7 @@ static int update_ipv4nh_for_route_install(int nh_othervrf,
*/
if (is_evpn) {
api_nh->type = NEXTHOP_TYPE_IPV4_IFINDEX;
api_nh->onlink = true;
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
api_nh->ifindex = nh_bgp->l3vni_svi_ifindex;
} else if (nh_othervrf &&
api_nh->gate.ipv4.s_addr == INADDR_ANY) {
@ -1098,7 +1098,7 @@ update_ipv6nh_for_route_install(int nh_othervrf, struct bgp *nh_bgp,
if (is_evpn) {
api_nh->type = NEXTHOP_TYPE_IPV6_IFINDEX;
api_nh->onlink = true;
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
api_nh->ifindex = nh_bgp->l3vni_svi_ifindex;
} else if (nh_othervrf) {
if (IN6_IS_ADDR_UNSPECIFIED(nexthop)) {
@ -1347,6 +1347,8 @@ void bgp_zebra_announce(struct bgp_node *rn, struct prefix *p,
has_valid_label = 1;
label = label_pton(&mpinfo->extra->label[0]);
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_LABEL);
api_nh->label_num = 1;
api_nh->labels[0] = label;
}
@ -1355,11 +1357,6 @@ void bgp_zebra_announce(struct bgp_node *rn, struct prefix *p,
valid_nh_count++;
}
/* if this is a evpn route we don't have to include the label */
if (has_valid_label && !(CHECK_FLAG(api.flags, ZEBRA_FLAG_EVPN_ROUTE)))
SET_FLAG(api.message, ZAPI_MESSAGE_LABEL);
/*
* When we create an aggregate route we must also
* install a Null0 route in the RIB, so overwrite

2
isisd/isis_zebra.c
View File

@ -184,7 +184,7 @@ void isis_zebra_route_add_route(struct prefix *prefix,
break;
api_nh = &api.nexthops[count];
if (fabricd)
api_nh->onlink = true;
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
api_nh->vrf_id = VRF_DEFAULT;
switch (nexthop->family) {

312
lib/zclient.c
View File

@ -859,6 +859,76 @@ static void zapi_nexthop_group_sort(struct zapi_nexthop *nh_grp,
&zapi_nexthop_cmp);
}
/*
* Encode a single zapi nexthop
*/
int zapi_nexthop_encode(struct stream *s, const struct zapi_nexthop *api_nh,
uint32_t api_flags)
{
int ret = 0;
int nh_flags = api_nh->flags;
stream_putl(s, api_nh->vrf_id);
stream_putc(s, api_nh->type);
/* If needed, set 'labelled nexthop' flag */
if (api_nh->label_num > 0) {
SET_FLAG(nh_flags, ZAPI_NEXTHOP_FLAG_LABEL);
/* Validate label count */
if (api_nh->label_num > MPLS_MAX_LABELS) {
ret = -1;
goto done;
}
}
/* Note that we're only encoding a single octet */
stream_putc(s, nh_flags);
switch (api_nh->type) {
case NEXTHOP_TYPE_BLACKHOLE:
stream_putc(s, api_nh->bh_type);
break;
case NEXTHOP_TYPE_IPV4:
stream_put_in_addr(s, &api_nh->gate.ipv4);
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
stream_put_in_addr(s, &api_nh->gate.ipv4);
stream_putl(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
stream_putl(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
stream_write(s, (uint8_t *)&api_nh->gate.ipv6,
16);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
stream_write(s, (uint8_t *)&api_nh->gate.ipv6,
16);
stream_putl(s, api_nh->ifindex);
break;
}
/* We only encode labels if we have >0 - we use
* the per-nexthop flag above to signal that the count
* is present in the payload.
*/
if (api_nh->label_num > 0) {
stream_putc(s, api_nh->label_num);
stream_put(s, &api_nh->labels[0],
api_nh->label_num * sizeof(mpls_label_t));
}
/* Router MAC for EVPN routes. */
if (CHECK_FLAG(api_flags, ZEBRA_FLAG_EVPN_ROUTE))
stream_put(s, &(api_nh->rmac),
sizeof(struct ethaddr));
done:
return ret;
}
int zapi_route_encode(uint8_t cmd, struct stream *s, struct zapi_route *api)
{
struct zapi_nexthop *api_nh;
@ -921,59 +991,22 @@ int zapi_route_encode(uint8_t cmd, struct stream *s, struct zapi_route *api)
for (i = 0; i < api->nexthop_num; i++) {
api_nh = &api->nexthops[i];
stream_putl(s, api_nh->vrf_id);
stream_putc(s, api_nh->type);
stream_putc(s, api_nh->onlink);
switch (api_nh->type) {
case NEXTHOP_TYPE_BLACKHOLE:
stream_putc(s, api_nh->bh_type);
break;
case NEXTHOP_TYPE_IPV4:
stream_put_in_addr(s, &api_nh->gate.ipv4);
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
stream_put_in_addr(s, &api_nh->gate.ipv4);
stream_putl(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
stream_putl(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
stream_write(s, (uint8_t *)&api_nh->gate.ipv6,
16);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
stream_write(s, (uint8_t *)&api_nh->gate.ipv6,
16);
stream_putl(s, api_nh->ifindex);
break;
}
/* MPLS labels for BGP-LU or Segment Routing */
if (CHECK_FLAG(api->message, ZAPI_MESSAGE_LABEL)) {
if (api_nh->label_num > MPLS_MAX_LABELS) {
char buf[PREFIX2STR_BUFFER];
prefix2str(&api->prefix, buf,
sizeof(buf));
flog_err(EC_LIB_ZAPI_ENCODE,
"%s: prefix %s: can't encode "
"%u labels (maximum is %u)",
__func__, buf,
api_nh->label_num,
MPLS_MAX_LABELS);
return -1;
}
if (api_nh->label_num > MPLS_MAX_LABELS) {
char buf[PREFIX2STR_BUFFER];
stream_putc(s, api_nh->label_num);
stream_put(s, &api_nh->labels[0],
api_nh->label_num
* sizeof(mpls_label_t));
prefix2str(&api->prefix, buf, sizeof(buf));
flog_err(EC_LIB_ZAPI_ENCODE,
"%s: prefix %s: can't encode %u labels (maximum is %u)",
__func__, buf,
api_nh->label_num,
MPLS_MAX_LABELS);
return -1;
}
/* Router MAC for EVPN routes. */
if (CHECK_FLAG(api->flags, ZEBRA_FLAG_EVPN_ROUTE))
stream_put(s, &(api_nh->rmac),
sizeof(struct ethaddr));
if (zapi_nexthop_encode(s, api_nh, api->flags) != 0)
return -1;
}
}
@ -995,6 +1028,73 @@ int zapi_route_encode(uint8_t cmd, struct stream *s, struct zapi_route *api)
return 0;
}
/*
* Decode a single zapi nexthop object
*/
static int zapi_nexthop_decode(struct stream *s, struct zapi_nexthop *api_nh,
uint32_t api_flags)
{
int ret = -1;
STREAM_GETL(s, api_nh->vrf_id);
STREAM_GETC(s, api_nh->type);
/* Note that we're only using a single octet of flags */
STREAM_GETC(s, api_nh->flags);
switch (api_nh->type) {
case NEXTHOP_TYPE_BLACKHOLE:
STREAM_GETC(s, api_nh->bh_type);
break;
case NEXTHOP_TYPE_IPV4:
STREAM_GET(&api_nh->gate.ipv4.s_addr, s,
IPV4_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
STREAM_GET(&api_nh->gate.ipv4.s_addr, s,
IPV4_MAX_BYTELEN);
STREAM_GETL(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
STREAM_GETL(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
STREAM_GET(&api_nh->gate.ipv6, s, 16);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
STREAM_GET(&api_nh->gate.ipv6, s, 16);
STREAM_GETL(s, api_nh->ifindex);
break;
}
/* MPLS labels for BGP-LU or Segment Routing */
if (CHECK_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_LABEL)) {
STREAM_GETC(s, api_nh->label_num);
if (api_nh->label_num > MPLS_MAX_LABELS) {
flog_err(
EC_LIB_ZAPI_ENCODE,
"%s: invalid number of MPLS labels (%u)",
__func__, api_nh->label_num);
return -1;
}
STREAM_GET(&api_nh->labels[0], s,
api_nh->label_num * sizeof(mpls_label_t));
}
/* Router MAC for EVPN routes. */
if (CHECK_FLAG(api_flags, ZEBRA_FLAG_EVPN_ROUTE))
STREAM_GET(&(api_nh->rmac), s,
sizeof(struct ethaddr));
/* Success */
ret = 0;
stream_failure:
return ret;
}
int zapi_route_decode(struct stream *s, struct zapi_route *api)
{
struct zapi_nexthop *api_nh;
@ -1088,55 +1188,8 @@ int zapi_route_decode(struct stream *s, struct zapi_route *api)
for (i = 0; i < api->nexthop_num; i++) {
api_nh = &api->nexthops[i];
STREAM_GETL(s, api_nh->vrf_id);
STREAM_GETC(s, api_nh->type);
STREAM_GETC(s, api_nh->onlink);
switch (api_nh->type) {
case NEXTHOP_TYPE_BLACKHOLE:
STREAM_GETC(s, api_nh->bh_type);
break;
case NEXTHOP_TYPE_IPV4:
STREAM_GET(&api_nh->gate.ipv4.s_addr, s,
IPV4_MAX_BYTELEN);
break;
case NEXTHOP_TYPE_IPV4_IFINDEX:
STREAM_GET(&api_nh->gate.ipv4.s_addr, s,
IPV4_MAX_BYTELEN);
STREAM_GETL(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
STREAM_GETL(s, api_nh->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
STREAM_GET(&api_nh->gate.ipv6, s, 16);
break;
case NEXTHOP_TYPE_IPV6_IFINDEX:
STREAM_GET(&api_nh->gate.ipv6, s, 16);
STREAM_GETL(s, api_nh->ifindex);
break;
}
/* MPLS labels for BGP-LU or Segment Routing */
if (CHECK_FLAG(api->message, ZAPI_MESSAGE_LABEL)) {
STREAM_GETC(s, api_nh->label_num);
if (api_nh->label_num > MPLS_MAX_LABELS) {
flog_err(
EC_LIB_ZAPI_ENCODE,
"%s: invalid number of MPLS labels (%u)",
__func__, api_nh->label_num);
return -1;
}
STREAM_GET(&api_nh->labels[0], s,
api_nh->label_num
* sizeof(mpls_label_t));
}
/* Router MAC for EVPN routes. */
if (CHECK_FLAG(api->flags, ZEBRA_FLAG_EVPN_ROUTE))
stream_get(&(api_nh->rmac), s,
sizeof(struct ethaddr));
if (zapi_nexthop_decode(s, api_nh, api->flags) != 0)
return -1;
}
}
@ -1335,6 +1388,35 @@ struct nexthop *nexthop_from_zapi_nexthop(struct zapi_nexthop *znh)
return n;
}
/*
* Convert nexthop to zapi nexthop
*/
int zapi_nexthop_from_nexthop(struct zapi_nexthop *znh,
const struct nexthop *nh)
{
int i;
memset(znh, 0, sizeof(*znh));
znh->type = nh->type;
znh->vrf_id = nh->vrf_id;
znh->ifindex = nh->ifindex;
znh->gate = nh->gate;
if (nh->nh_label && (nh->nh_label->num_labels > 0)) {
for (i = 0; i < nh->nh_label->num_labels; i++)
znh->labels[i] = nh->nh_label->label[i];
znh->label_num = i;
SET_FLAG(znh->flags, ZAPI_NEXTHOP_FLAG_LABEL);
}
return 0;
}
/*
* Decode the nexthop-tracking update message
*/
bool zapi_nexthop_update_decode(struct stream *s, struct zapi_route *nhr)
{
uint32_t i;
@ -1361,38 +1443,8 @@ bool zapi_nexthop_update_decode(struct stream *s, struct zapi_route *nhr)
STREAM_GETC(s, nhr->nexthop_num);
for (i = 0; i < nhr->nexthop_num; i++) {
STREAM_GETL(s, nhr->nexthops[i].vrf_id);
STREAM_GETC(s, nhr->nexthops[i].type);
switch (nhr->nexthops[i].type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
STREAM_GET(&nhr->nexthops[i].gate.ipv4.s_addr, s,
IPV4_MAX_BYTELEN);
STREAM_GETL(s, nhr->nexthops[i].ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
STREAM_GETL(s, nhr->nexthops[i].ifindex);
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
STREAM_GET(&nhr->nexthops[i].gate.ipv6, s,
IPV6_MAX_BYTELEN);
STREAM_GETL(s, nhr->nexthops[i].ifindex);
break;
case NEXTHOP_TYPE_BLACKHOLE:
break;
}
STREAM_GETC(s, nhr->nexthops[i].label_num);
if (nhr->nexthops[i].label_num > MPLS_MAX_LABELS) {
flog_err(EC_LIB_ZAPI_ENCODE,
"%s: invalid number of MPLS labels (%u)",
__func__, nhr->nexthops[i].label_num);
return false;
}
if (nhr->nexthops[i].label_num)
STREAM_GET(&nhr->nexthops[i].labels[0], s,
nhr->nexthops[i].label_num
* sizeof(mpls_label_t));
if (zapi_nexthop_decode(s, &(nhr->nexthops[i]), 0) != 0)
return -1;
}
return true;

13
lib/zclient.h
View File

@ -289,7 +289,6 @@ struct zclient {
#define ZAPI_MESSAGE_TAG 0x08
#define ZAPI_MESSAGE_MTU 0x10
#define ZAPI_MESSAGE_SRCPFX 0x20
#define ZAPI_MESSAGE_LABEL 0x40
/*
* This should only be used by a DAEMON that needs to communicate
* the table being used is not in the VRF. You must pass the
@ -313,7 +312,7 @@ struct zapi_nexthop {
enum nexthop_types_t type;
vrf_id_t vrf_id;
ifindex_t ifindex;
bool onlink;
uint8_t flags;
union {
union g_addr gate;
enum blackhole_type bh_type;
@ -326,6 +325,12 @@ struct zapi_nexthop {
struct ethaddr rmac;
};
/*
* ZAPI nexthop flags values
*/
#define ZAPI_NEXTHOP_FLAG_ONLINK 0x01
#define ZAPI_NEXTHOP_FLAG_LABEL 0x02
/*
* Some of these data structures do not map easily to
* a actual data structure size giving different compilers
@ -666,6 +671,8 @@ extern int zclient_route_send(uint8_t, struct zclient *, struct zapi_route *);
extern int zclient_send_rnh(struct zclient *zclient, int command,
struct prefix *p, bool exact_match,
vrf_id_t vrf_id);
int zapi_nexthop_encode(struct stream *s, const struct zapi_nexthop *api_nh,
uint32_t api_flags);
extern int zapi_route_encode(uint8_t, struct stream *, struct zapi_route *);
extern int zapi_route_decode(struct stream *, struct zapi_route *);
bool zapi_route_notify_decode(struct stream *s, struct prefix *p,
@ -690,6 +697,8 @@ bool zapi_iptable_notify_decode(struct stream *s,
enum zapi_iptable_notify_owner *note);
extern struct nexthop *nexthop_from_zapi_nexthop(struct zapi_nexthop *znh);
int zapi_nexthop_from_nexthop(struct zapi_nexthop *znh,
const struct nexthop *nh);
extern bool zapi_nexthop_update_decode(struct stream *s,
struct zapi_route *nhr);

5
staticd/static_zebra.c
View File

@ -388,7 +388,8 @@ extern void static_zebra_route_add(struct route_node *rn,
continue;
api_nh->vrf_id = si->nh_vrf_id;
api_nh->onlink = si->onlink;
if (si->onlink)
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK);
si->state = STATIC_SENT_TO_ZEBRA;
@ -441,7 +442,7 @@ extern void static_zebra_route_add(struct route_node *rn,
if (si->snh_label.num_labels) {
int i;
SET_FLAG(api.message, ZAPI_MESSAGE_LABEL);
SET_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_LABEL);
api_nh->label_num = si->snh_label.num_labels;
for (i = 0; i < api_nh->label_num; i++)
api_nh->labels[i] = si->snh_label.label[i];

11
zebra/zapi_msg.c
View File

@ -1411,11 +1411,8 @@ static void zread_route_add(ZAPI_HANDLER_ARGS)
char buf_prefix[PREFIX_STRLEN];
prefix2str(&api.prefix, buf_prefix, sizeof(buf_prefix));
zlog_debug("%s: p=%s, ZAPI_MESSAGE_LABEL: %sset, flags=0x%x",
__func__, buf_prefix,
(CHECK_FLAG(api.message, ZAPI_MESSAGE_LABEL) ? ""
: "un"),
api.flags);
zlog_debug("%s: p=%s, flags=0x%x",
__func__, buf_prefix, api.flags);
}
/* Allocate new route. */
@ -1544,11 +1541,11 @@ static void zread_route_add(ZAPI_HANDLER_ARGS)
return;
}
if (api_nh->onlink)
if (CHECK_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_ONLINK))
SET_FLAG(nexthop->flags, NEXTHOP_FLAG_ONLINK);
/* MPLS labels for BGP-LU or Segment Routing */
if (CHECK_FLAG(api.message, ZAPI_MESSAGE_LABEL)
if (CHECK_FLAG(api_nh->flags, ZAPI_NEXTHOP_FLAG_LABEL)
&& api_nh->type != NEXTHOP_TYPE_IFINDEX
&& api_nh->type != NEXTHOP_TYPE_BLACKHOLE) {
enum lsp_types_t label_type;

35
zebra/zebra_rnh.c
View File

@ -1034,6 +1034,8 @@ static int send_client(struct rnh *rnh, struct zserv *client, rnh_type_t type,
break;
}
if (re) {
struct zapi_nexthop znh;
stream_putc(s, re->type);
stream_putw(s, re->instance);
stream_putc(s, re->distance);
@ -1043,37 +1045,8 @@ static int send_client(struct rnh *rnh, struct zserv *client, rnh_type_t type,
stream_putc(s, 0);
for (ALL_NEXTHOPS_PTR(re->nhe->nhg, nh))
if (rnh_nexthop_valid(re, nh)) {
stream_putl(s, nh->vrf_id);
stream_putc(s, nh->type);
switch (nh->type) {
case NEXTHOP_TYPE_IPV4:
case NEXTHOP_TYPE_IPV4_IFINDEX:
stream_put_in_addr(s, &nh->gate.ipv4);
stream_putl(s, nh->ifindex);
break;
case NEXTHOP_TYPE_IFINDEX:
stream_putl(s, nh->ifindex);
break;
case NEXTHOP_TYPE_IPV6:
case NEXTHOP_TYPE_IPV6_IFINDEX:
stream_put(s, &nh->gate.ipv6, 16);
stream_putl(s, nh->ifindex);
break;
default:
/* do nothing */
break;
}
if (nh->nh_label) {
stream_putc(s,
nh->nh_label->num_labels);
if (nh->nh_label->num_labels)
stream_put(
s,
&nh->nh_label->label[0],
nh->nh_label->num_labels
* sizeof(mpls_label_t));
} else
stream_putc(s, 0);
zapi_nexthop_from_nexthop(&znh, nh);
zapi_nexthop_encode(s, &znh, 0 /* flags */);
num++;
}
stream_putc_at(s, nump, num);