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diff --git a/sys/net/route/nhgrp_ctl.c b/sys/net/route/nhgrp_ctl.c
--- a/sys/net/route/nhgrp_ctl.c
+++ b/sys/net/route/nhgrp_ctl.c
@@ -632,6 +632,63 @@
return (nhg_priv);
}
+/*
+ * Merge nexthop group denoted by @gr_add with the nexthop group @gr_orig.
+ *
+ * Returns referenced nexthop group or NULL. In the latter case, @perror is
+ * filled with an error code.
+ * Note that function does NOT care if the next nexthops already exists
+ * in the @gr_orig. As a result, they will be added, resulting in the
+ * same nexthop being present multiple times in the new group.
+ */
+static struct nhgrp_priv *
+merge_nhgrps(struct nh_control *ctl, const struct nhgrp_object *gr_orig,
+ const struct nhgrp_object *gr_add, int *perror)
+{
+ char storage[64];
+ struct weightened_nhop *pnhops;
+ struct nhgrp_priv *nhg_priv;
+ const struct nhgrp_priv *orig_priv, *add_priv;
+ size_t sz;
+ int curr_nhops;
+
+ orig_priv = NHGRP_PRIV_CONST(gr_orig);
+ add_priv = NHGRP_PRIV_CONST(gr_add);
+ curr_nhops = orig_priv->nhg_nh_count;
+
+ *perror = 0;
+
+ sz = (orig_priv->nhg_nh_count + orig_priv->nhg_nh_count) *
+ sizeof(struct weightened_nhop);
+ /* optimize for <= 4 paths, each path=16 bytes */
+ if (sz <= sizeof(storage))
+ pnhops = (struct weightened_nhop *)&storage[0];
+ else {
+ pnhops = malloc(sz, M_TEMP, M_NOWAIT);
+ if (pnhops == NULL) {
+ *perror = ENOMEM;
+ return (NULL);
+ }
+ }
+
+ /* First, copy nhops from first group */
+ memcpy(pnhops, orig_priv->nhg_nh_weights,
+ orig_priv->nhg_nh_count * sizeof(struct weightened_nhop));
+ memcpy(&pnhops[curr_nhops], add_priv->nhg_nh_weights,
+ add_priv->nhg_nh_count * sizeof(struct weightened_nhop));
+ curr_nhops += add_priv->nhg_nh_count;
+
+ nhg_priv = get_nhgrp(ctl, pnhops, curr_nhops, 0, perror);
+
+ if (pnhops != (struct weightened_nhop *)&storage[0])
+ free(pnhops, M_TEMP);
+
+ if (nhg_priv == NULL)
+ return (NULL);
+
+ return (nhg_priv);
+}
+
/*
* Creates/finds nexthop group based on @wn and @num_nhops.
@@ -728,6 +785,8 @@
struct weightened_nhop wn[2] = {};
int error;
+ MPASS((!NH_IS_NHGRP(rnd_add->rnd_nhop)));
+
if (rnd_orig->rnd_nhop == NULL) {
/* No paths to add to, just reference current nhop */
*rnd_new = *rnd_add;
@@ -758,6 +817,46 @@
return (0);
}
+/*
+ * Creates new multipath group based on existing group/nhop in @rnd_orig and
+ * to-be-merged nhgrp @wn_add.
+ * Returns 0 on success and stores result in @rnd_new.
+ */
+int
+nhgrp_get_merge_group(struct rib_head *rh, struct route_nhop_data *rnd_orig,
+ struct route_nhop_data *rnd_add, struct route_nhop_data *rnd_new)
+{
+ struct nh_control *ctl = rh->nh_control;
+ struct nhgrp_priv *nhg_priv;
+ struct weightened_nhop wn = {};
+ int error;
+
+ MPASS((NH_IS_NHGRP(rnd_add->rnd_nhop)));
+
+ /* No paths to add to, Just give up */
+ if (rnd_orig->rnd_nhop == NULL)
+ return (EINVAL);
+
+ if (!NH_IS_NHGRP(rnd_orig->rnd_nhop)) {
+ wn.nh = rnd_orig->rnd_nhop;
+ wn.weight = rnd_orig->rnd_weight;
+ /* Get new nhop group with addition of nhops in nhgrp */
+ nhg_priv = append_nhops(ctl, rnd_add->rnd_nhgrp, &wn, 1,
+ &error);
+ } else {
+ /* Get new nhop group with addition of nhops in nhgrp */
+ nhg_priv = merge_nhgrps(ctl, rnd_orig->rnd_nhgrp, rnd_add->rnd_nhgrp,
+ &error);
+ }
+
+ if (nhg_priv == NULL)
+ return (error);
+ rnd_new->rnd_nhgrp = nhg_priv->nhg;
+ rnd_new->rnd_weight = 0;
+
+ return (0);
+}
+
/*
* Returns pointer to array of nexthops with weights for
* given @nhg. Stores number of items in the array into @pnum_nhops.
diff --git a/sys/net/route/route_ctl.c b/sys/net/route/route_ctl.c
--- a/sys/net/route/route_ctl.c
+++ b/sys/net/route/route_ctl.c
@@ -858,7 +858,10 @@
struct route_nhop_data rnd_new;
int error = 0;
- error = nhgrp_get_addition_group(rnh, rnd_orig, rnd_add, &rnd_new);
+ if (!NH_IS_NHGRP(rnd_add->rnd_nhop))
+ error = nhgrp_get_addition_group(rnh, rnd_orig, rnd_add, &rnd_new);
+ else
+ error = nhgrp_get_merge_group(rnh, rnd_orig, rnd_add, &rnd_new);
if (error != 0) {
if (error == EAGAIN) {
/*
diff --git a/sys/net/route/route_var.h b/sys/net/route/route_var.h
--- a/sys/net/route/route_var.h
+++ b/sys/net/route/route_var.h
@@ -309,6 +309,9 @@
int nhgrp_get_addition_group(struct rib_head *rnh,
struct route_nhop_data *rnd_orig, struct route_nhop_data *rnd_add,
struct route_nhop_data *rnd_new);
+int nhgrp_get_merge_group(struct rib_head *rnh,
+ struct route_nhop_data *rnd_orig, struct route_nhop_data *rnd_add,
+ struct route_nhop_data *rnd_new);
void nhgrp_ref_object(struct nhgrp_object *nhg);
uint32_t nhgrp_get_idx(const struct nhgrp_object *nhg);

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