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Merge pull request #1766 from donaldsharp/label_label_label

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zebra: implement recursive MPLS labels
This commit is contained in:
Russ White 2018-02-20 06:58:01 -05:00 committed by GitHub
commit ac71b27a7c
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 94 additions and 97 deletions
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191
zebra/rt_netlink.c
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@ -840,6 +840,7 @@ static void _netlink_route_build_singlepath(const char *routedesc, int bytelen,
{
struct mpls_label_stack *nh_label;
mpls_lse_t out_lse[MPLS_MAX_LABELS];
int num_labels = 0;
char label_buf[256];
/*
@ -849,56 +850,54 @@ static void _netlink_route_build_singlepath(const char *routedesc, int bytelen,
* you fix this assumption
*/
label_buf[0] = '\0';
/* outgoing label - either as NEWDST (in the case of LSR) or as ENCAP
* (in the case of LER)
*/
nh_label = nexthop->nh_label;
if (rtmsg->rtm_family == AF_MPLS) {
assert(nh_label);
assert(nh_label->num_labels == 1);
}
if (nh_label && nh_label->num_labels) {
int i, num_labels = 0;
u_int32_t bos;
assert(nexthop);
for (struct nexthop *nh = nexthop; nh; nh = nh->rparent) {
char label_buf1[20];
for (i = 0; i < nh_label->num_labels; i++) {
if (nh_label->label[i] != MPLS_LABEL_IMPLICIT_NULL) {
bos = ((i == (nh_label->num_labels - 1)) ? 1
: 0);
out_lse[i] = mpls_lse_encode(nh_label->label[i],
0, 0, bos);
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!num_labels)
sprintf(label_buf, "label %u",
nh_label->label[i]);
else {
sprintf(label_buf1, "/%u",
nh_label->label[i]);
strlcat(label_buf, label_buf1,
sizeof(label_buf));
}
}
num_labels++;
}
}
if (num_labels) {
if (rtmsg->rtm_family == AF_MPLS)
addattr_l(nlmsg, req_size, RTA_NEWDST, &out_lse,
num_labels * sizeof(mpls_lse_t));
else {
struct rtattr *nest;
u_int16_t encap = LWTUNNEL_ENCAP_MPLS;
nh_label = nh->nh_label;
if (!nh_label || !nh_label->num_labels)
continue;
addattr_l(nlmsg, req_size, RTA_ENCAP_TYPE,
&encap, sizeof(u_int16_t));
nest = addattr_nest(nlmsg, req_size, RTA_ENCAP);
addattr_l(nlmsg, req_size, MPLS_IPTUNNEL_DST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
addattr_nest_end(nlmsg, nest);
for (int i = 0; i < nh_label->num_labels; i++) {
if (nh_label->label[i] == MPLS_LABEL_IMPLICIT_NULL)
continue;
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!num_labels)
sprintf(label_buf, "label %u",
nh_label->label[i]);
else {
sprintf(label_buf1, "/%u",
nh_label->label[i]);
strlcat(label_buf, label_buf1,
sizeof(label_buf));
}
}
out_lse[num_labels] =
mpls_lse_encode(nh_label->label[i], 0, 0, 0);
num_labels++;
}
}
if (num_labels) {
/* Set the BoS bit */
out_lse[num_labels - 1] |= htonl(1 << MPLS_LS_S_SHIFT);
if (rtmsg->rtm_family == AF_MPLS)
addattr_l(nlmsg, req_size, RTA_NEWDST, &out_lse,
num_labels * sizeof(mpls_lse_t));
else {
struct rtattr *nest;
u_int16_t encap = LWTUNNEL_ENCAP_MPLS;
addattr_l(nlmsg, req_size, RTA_ENCAP_TYPE, &encap,
sizeof(u_int16_t));
nest = addattr_nest(nlmsg, req_size, RTA_ENCAP);
addattr_l(nlmsg, req_size, MPLS_IPTUNNEL_DST, &out_lse,
num_labels * sizeof(mpls_lse_t));
addattr_nest_end(nlmsg, nest);
}
}
@ -1045,6 +1044,7 @@ static void _netlink_route_build_multipath(const char *routedesc, int bytelen,
{
struct mpls_label_stack *nh_label;
mpls_lse_t out_lse[MPLS_MAX_LABELS];
int num_labels = 0;
char label_buf[256];
rtnh->rtnh_len = sizeof(*rtnh);
@ -1059,63 +1059,60 @@ static void _netlink_route_build_multipath(const char *routedesc, int bytelen,
* you fix this assumption
*/
label_buf[0] = '\0';
/* outgoing label - either as NEWDST (in the case of LSR) or as ENCAP
* (in the case of LER)
*/
nh_label = nexthop->nh_label;
if (rtmsg->rtm_family == AF_MPLS) {
assert(nh_label);
assert(nh_label->num_labels == 1);
}
if (nh_label && nh_label->num_labels) {
int i, num_labels = 0;
u_int32_t bos;
assert(nexthop);
for (struct nexthop *nh = nexthop; nh; nh = nh->rparent) {
char label_buf1[20];
for (i = 0; i < nh_label->num_labels; i++) {
if (nh_label->label[i] != MPLS_LABEL_IMPLICIT_NULL) {
bos = ((i == (nh_label->num_labels - 1)) ? 1
: 0);
out_lse[i] = mpls_lse_encode(nh_label->label[i],
0, 0, bos);
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!num_labels)
sprintf(label_buf, "label %u",
nh_label->label[i]);
else {
sprintf(label_buf1, "/%u",
nh_label->label[i]);
strlcat(label_buf, label_buf1,
sizeof(label_buf));
}
}
num_labels++;
}
}
if (num_labels) {
if (rtmsg->rtm_family == AF_MPLS) {
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_NEWDST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
rtnh->rtnh_len += RTA_LENGTH(
num_labels * sizeof(mpls_lse_t));
} else {
struct rtattr *nest;
u_int16_t encap = LWTUNNEL_ENCAP_MPLS;
int len = rta->rta_len;
nh_label = nh->nh_label;
if (!nh_label || !nh_label->num_labels)
continue;
rta_addattr_l(rta, NL_PKT_BUF_SIZE,
RTA_ENCAP_TYPE, &encap,
sizeof(u_int16_t));
nest = rta_nest(rta, NL_PKT_BUF_SIZE,
RTA_ENCAP);
rta_addattr_l(rta, NL_PKT_BUF_SIZE,
MPLS_IPTUNNEL_DST, &out_lse,
num_labels * sizeof(mpls_lse_t));
rta_nest_end(rta, nest);
rtnh->rtnh_len += rta->rta_len - len;
for (int i = 0; i < nh_label->num_labels; i++) {
if (nh_label->label[i] == MPLS_LABEL_IMPLICIT_NULL)
continue;
if (IS_ZEBRA_DEBUG_KERNEL) {
if (!num_labels)
sprintf(label_buf, "label %u",
nh_label->label[i]);
else {
sprintf(label_buf1, "/%u",
nh_label->label[i]);
strlcat(label_buf, label_buf1,
sizeof(label_buf));
}
}
out_lse[num_labels] =
mpls_lse_encode(nh_label->label[i], 0, 0, 0);
num_labels++;
}
}
if (num_labels) {
/* Set the BoS bit */
out_lse[num_labels - 1] |= htonl(1 << MPLS_LS_S_SHIFT);
if (rtmsg->rtm_family == AF_MPLS) {
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_NEWDST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
rtnh->rtnh_len +=
RTA_LENGTH(num_labels * sizeof(mpls_lse_t));
} else {
struct rtattr *nest;
u_int16_t encap = LWTUNNEL_ENCAP_MPLS;
int len = rta->rta_len;
rta_addattr_l(rta, NL_PKT_BUF_SIZE, RTA_ENCAP_TYPE,
&encap, sizeof(u_int16_t));
nest = rta_nest(rta, NL_PKT_BUF_SIZE, RTA_ENCAP);
rta_addattr_l(rta, NL_PKT_BUF_SIZE, MPLS_IPTUNNEL_DST,
&out_lse,
num_labels * sizeof(mpls_lse_t));
rta_nest_end(rta, nest);
rtnh->rtnh_len += rta->rta_len - len;
}
}