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// SPDX-License-Identifier: GPL-2.0-or-later
/*
* This is an implementation of Segment Routing over IPv6 (SRv6) for IS-IS
* as per RFC 9352
* https://datatracker.ietf.org/doc/html/rfc9352
*
* Copyright (C) 2023 Carmine Scarpitta - University of Rome Tor Vergata
*/
#include <zebra.h>
#include "srv6.h"
#include "termtable.h"
#include "isisd/isisd.h"
#include "isisd/isis_misc.h"
#include "isisd/isis_srv6.h"
#include "isisd/isis_zebra.h"
/**
* Unset the SRv6 locator for a given IS-IS area.
*
* @param area IS-IS area
*
* @result True on success, False otherwise
*/
bool isis_srv6_locator_unset(struct isis_area *area)
{
int ret;
struct listnode *node, *nnode;
struct srv6_locator_chunk *chunk;
if (strncmp(area->srv6db.config.srv6_locator_name, "",
sizeof(area->srv6db.config.srv6_locator_name)) == 0) {
sr_debug("SRv6 locator not set");
return true;
}
/* Inform Zebra that we are releasing the SRv6 locator */
ret = isis_zebra_srv6_manager_release_locator_chunk(
area->srv6db.config.srv6_locator_name);
if (ret < 0)
return false;
/* Delete chunks */
for (ALL_LIST_ELEMENTS(area->srv6db.srv6_locator_chunks, node, nnode,
chunk)) {
sr_debug(
"Releasing chunk of locator %s (prefix %pFX) for IS-IS area %s",
area->srv6db.config.srv6_locator_name, &chunk->prefix,
area->area_tag);
listnode_delete(area->srv6db.srv6_locator_chunks, chunk);
srv6_locator_chunk_free(&chunk);
}
/* Clear locator name */
memset(area->srv6db.config.srv6_locator_name, 0,
sizeof(area->srv6db.config.srv6_locator_name));
/* Regenerate LSPs to advertise that the SRv6 locator no longer exists
*/
lsp_regenerate_schedule(area, area->is_type, 0);
return true;
}
/**
* Show Segment Routing over IPv6 (SRv6) Node.
*
* @param vty VTY output
* @param area IS-IS area
* @param level IS-IS level
*/
static void show_node(struct vty *vty, struct isis_area *area, int level)
{
struct isis_lsp *lsp;
struct ttable *tt;
vty_out(vty, " IS-IS %s SRv6-Nodes:\n\n", circuit_t2string(level));
/* Prepare table. */
tt = ttable_new(&ttable_styles[TTSTYLE_BLANK]);
ttable_add_row(
tt,
"System ID|Algorithm|SRH Max SL|SRH Max End Pop|SRH Max H.encaps|SRH Max End D");
tt->style.cell.rpad = 2;
tt->style.corner = '+';
ttable_restyle(tt);
ttable_rowseps(tt, 0, BOTTOM, true, '-');
frr_each (lspdb, &area->lspdb[level - 1], lsp) {
struct isis_router_cap *cap;
if (!lsp->tlvs)
continue;
cap = lsp->tlvs->router_cap;
if (!cap)
continue;
ttable_add_row(tt, "%pSY|%s|%u|%u|%u|%u", lsp->hdr.lsp_id,
cap->algo[0] == SR_ALGORITHM_SPF ? "SPF"
: "S-SPF",
cap->srv6_msd.max_seg_left_msd,
cap->srv6_msd.max_end_pop_msd,
cap->srv6_msd.max_h_encaps_msd,
cap->srv6_msd.max_end_d_msd);
}
/* Dump the generated table. */
if (tt->nrows > 1) {
char *table;
table = ttable_dump(tt, "\n");
vty_out(vty, "%s\n", table);
XFREE(MTYPE_TMP, table);
}
ttable_del(tt);
}
DEFUN(show_srv6_node, show_srv6_node_cmd,
"show " PROTO_NAME " segment-routing srv6 node",
SHOW_STR
PROTO_HELP
"Segment-Routing\n"
"Segment-Routing over IPv6 (SRv6)\n"
"SRv6 node\n")
{
struct listnode *node, *inode;
struct isis_area *area;
struct isis *isis;
for (ALL_LIST_ELEMENTS_RO(im->isis, inode, isis)) {
for (ALL_LIST_ELEMENTS_RO(isis->area_list, node, area)) {
vty_out(vty, "Area %s:\n",
area->area_tag ? area->area_tag : "null");
if (!area->srv6db.config.enabled) {
vty_out(vty, " SRv6 is disabled\n");
continue;
}
for (int level = ISIS_LEVEL1; level <= ISIS_LEVELS;
level++)
show_node(vty, area, level);
}
}
return CMD_SUCCESS;
}
/**
* IS-IS SRv6 initialization for given area.
*
* @param area IS-IS area
*/
void isis_srv6_area_init(struct isis_area *area)
{
struct isis_srv6_db *srv6db;
if (!area)
return;
srv6db = &area->srv6db;
sr_debug("ISIS-SRv6 (%s): Initialize Segment Routing SRv6 DB",
area->area_tag);
/* Initialize SRv6 Data Base */
memset(srv6db, 0, sizeof(*srv6db));
/* Pull defaults from the YANG module */
srv6db->config.enabled = yang_get_default_bool("%s/enabled", ISIS_SRV6);
srv6db->config.max_seg_left_msd = SRV6_MAX_SEG_LEFT;
srv6db->config.max_end_pop_msd = SRV6_MAX_END_POP;
srv6db->config.max_h_encaps_msd = SRV6_MAX_H_ENCAPS;
srv6db->config.max_end_d_msd = SRV6_MAX_END_D;
/* Initialize SRv6 Locator chunks list */
srv6db->srv6_locator_chunks = list_new();
}
/**
* Terminate IS-IS SRv6 for the given area.
*
* @param area IS-IS area
*/
void isis_srv6_area_term(struct isis_area *area)
{
struct isis_srv6_db *srv6db = &area->srv6db;
struct listnode *node, *nnode;
struct srv6_locator_chunk *chunk;
sr_debug("ISIS-SRv6 (%s): Terminate SRv6", area->area_tag);
/* Free SRv6 Locator chunks list */
for (ALL_LIST_ELEMENTS(srv6db->srv6_locator_chunks, node, nnode, chunk))
srv6_locator_chunk_free(&chunk);
list_delete(&srv6db->srv6_locator_chunks);
}
/**
* IS-IS SRv6 global initialization.
*/
void isis_srv6_init(void)
{
install_element(VIEW_NODE, &show_srv6_node_cmd);
}
/**
* IS-IS SRv6 global terminate.
*/
void isis_srv6_term(void)
{
}
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