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netlink.c
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netlink.c
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// Copyright (c) 2020 Microchip Technology Inc. and its subsidiaries.
// SPDX-License-Identifier: (GPL-2.0)
#include <stdio.h>
#include <stdint.h>
#include <unistd.h>
#include <getopt.h>
#include <netlink/genl/genl.h>
#include <netlink/genl/ctrl.h>
#include <linux/types.h>
#include <linux/if_bridge.h>
#include <net/if.h>
#include <errno.h>
#include "state_machine.h"
#include "utils.h"
#include "libnetlink.h"
#include "print.h"
static struct rtnl_handle rth = { .fd = -1 };
static LIST_HEAD(mrp_rings);
struct mrp_ring {
struct list_head list;
uint32_t ifindex;
uint32_t ring_id;
uint32_t p_ifindex;
uint32_t s_ifindex;
};
struct request {
struct nlmsghdr n;
struct ifinfomsg ifm;
char buf[1024];
};
static void mrp_nl_bridge_prepare(uint32_t ifindex, int cmd, struct request *req,
struct rtattr **afspec, struct rtattr **afmrp,
struct rtattr **af_submrp, int mrp_attr)
{
req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req->n.nlmsg_flags = NLM_F_REQUEST;
req->n.nlmsg_type = cmd;
req->ifm.ifi_family = PF_BRIDGE;
req->ifm.ifi_index = ifindex;
*afspec = addattr_nest(&req->n, sizeof(*req), IFLA_AF_SPEC);
addattr16(&req->n, sizeof(*req), IFLA_BRIDGE_FLAGS, BRIDGE_FLAGS_SELF);
*afmrp = addattr_nest(&req->n, sizeof(*req),
IFLA_BRIDGE_MRP | NLA_F_NESTED);
*af_submrp = addattr_nest(&req->n, sizeof(*req),
mrp_attr | NLA_F_NESTED);
}
static void mrp_nl_port_prepare(struct mrp_port *port, int cmd,
struct request *req, struct rtattr **afspec,
struct rtattr **afmrp,
struct rtattr **af_submrp, int mrp_attr)
{
req->n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req->n.nlmsg_flags = NLM_F_REQUEST;
req->n.nlmsg_type = cmd;
req->ifm.ifi_family = PF_BRIDGE;
req->ifm.ifi_index = port->ifindex;
*afspec = addattr_nest(&req->n, sizeof(*req), IFLA_AF_SPEC);
*afmrp = addattr_nest(&req->n, sizeof(*req),
IFLA_BRIDGE_MRP | NLA_F_NESTED);
*af_submrp = addattr_nest(&req->n, sizeof(*req),
mrp_attr | NLA_F_NESTED);
}
static int mrp_nl_terminate(struct request *req, struct rtattr *afspec,
struct rtattr *afmrp, struct rtattr *af_submrp)
{
int err;
addattr_nest_end(&req->n, af_submrp);
addattr_nest_end(&req->n, afmrp);
addattr_nest_end(&req->n, afspec);
err = rtnl_talk(&rth, &req->n, NULL);
if (err)
return err;
return 0;
}
static int get_bridges(struct nlmsghdr *n, void *arg)
{
struct rtattr *aftb[IFLA_BRIDGE_MAX + 1];
struct rtattr *mrp_infotb[IFLA_BRIDGE_MRP_INFO_MAX + 1];
struct ifinfomsg *ifi = NLMSG_DATA(n);
struct rtattr *tb[IFLA_MAX + 1];
struct mrp_ring *mrp_ring;
int len = n->nlmsg_len;
struct rtattr *i, *list;
int rem;
len -= NLMSG_LENGTH(sizeof(*ifi));
if (len < 0) {
pr_err("Message too short!");
return -1;
}
if (ifi->ifi_family != AF_BRIDGE)
return 0;
parse_rtattr_flags(tb, IFLA_MAX, IFLA_RTA(ifi), len, NLA_F_NESTED);
if (!tb[IFLA_AF_SPEC])
return 0;
parse_rtattr_nested(aftb, IFLA_BRIDGE_MAX, tb[IFLA_AF_SPEC]);
if (!aftb[IFLA_BRIDGE_MRP])
return 0;
list = aftb[IFLA_BRIDGE_MRP];
rem = RTA_PAYLOAD(list);
for (i = RTA_DATA(list); RTA_OK(i, rem); i = RTA_NEXT(i, rem)) {
if (i->rta_type != IFLA_BRIDGE_MRP_INFO)
continue;
parse_rtattr_nested(mrp_infotb, IFLA_BRIDGE_MRP_INFO_MAX, i);
if (!mrp_infotb[IFLA_BRIDGE_MRP_INFO_RING_ID])
return 0;
mrp_ring = malloc(sizeof(*mrp_ring));
memset(mrp_ring, 0x0, sizeof(*mrp_ring));
mrp_ring->ifindex = rta_getattr_u32(tb[IFLA_MASTER]);
mrp_ring->ring_id = rta_getattr_u32(mrp_infotb[IFLA_BRIDGE_MRP_INFO_RING_ID]);
mrp_ring->p_ifindex = rta_getattr_u32(mrp_infotb[IFLA_BRIDGE_MRP_INFO_P_IFINDEX]);
mrp_ring->s_ifindex = rta_getattr_u32(mrp_infotb[IFLA_BRIDGE_MRP_INFO_S_IFINDEX]);
list_add_tail(&mrp_ring->list, &mrp_rings);
}
return 0;
}
static int mrp_netlink_clear(void)
{
struct mrp_ring *mrp_ring;
int err;
err = rtnl_linkdump_req_filter(&rth, PF_BRIDGE, RTEXT_FILTER_MRP);
if (err < 0) {
pr_err("Cannot rtnl_linkdump_req_filter");
return err;
}
rtnl_dump_filter(&rth, get_bridges, NULL);
list_for_each_entry(mrp_ring, &mrp_rings, list) {
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp_ring->ifindex, RTM_DELLINK, &req,
&afspec, &afmrp, &af_submrp,
IFLA_BRIDGE_MRP_INSTANCE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_RING_ID,
mrp_ring->ring_id);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX,
mrp_ring->p_ifindex);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX,
mrp_ring->s_ifindex);
mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
return 0;
}
int mrp_netlink_init(void)
{
if (rtnl_open(&rth, 0) < 0) {
pr_err("Cannot open rtnetlink");
return EXIT_FAILURE;
}
mrp_netlink_clear();
return 0;
}
void mrp_netlink_uninit(void)
{
rtnl_close(&rth);
}
int mrp_netlink_add(struct mrp *mrp, struct mrp_port *p, struct mrp_port *s,
uint16_t prio)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec,
&afmrp, &af_submrp, IFLA_BRIDGE_MRP_INSTANCE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_RING_ID,
mrp->ring_nr);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX,
p->ifindex);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX,
s->ifindex);
addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_PRIO, prio);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_del(struct mrp *mrp)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_DELLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_INSTANCE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_RING_ID,
mrp->ring_nr);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_P_IFINDEX,
mrp->p_port ? mrp->p_port->ifindex : 0);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_INSTANCE_S_IFINDEX,
mrp->s_port ? mrp->s_port->ifindex : 0);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_port_netlink_set_state(struct mrp_port *p,
enum br_mrp_port_state_type state)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
p->state = state;
mrp_nl_port_prepare(p, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_PORT_STATE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_PORT_STATE_STATE, state);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_port_netlink_set_role(struct mrp_port *p,
enum br_mrp_port_role_type role)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
p->role = role;
mrp_nl_port_prepare(p, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_PORT_ROLE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_PORT_ROLE_ROLE, role);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_set_ring_state(struct mrp *mrp,
enum br_mrp_ring_state_type state)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_RING_STATE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_RING_STATE_RING_ID,
mrp->ring_nr);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_RING_STATE_STATE,
state);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_set_ring_role(struct mrp *mrp, enum br_mrp_ring_role_type role)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp->ring_role = role;
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_RING_ROLE);
if (mrp->mra_support)
role = BR_MRP_RING_ROLE_MRA;
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_RING_ROLE_RING_ID,
mrp->ring_nr);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_RING_ROLE_ROLE,
role);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_send_ring_test(struct mrp *mrp, uint32_t interval, uint32_t max,
uint32_t period)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_START_TEST);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_TEST_RING_ID,
mrp->ring_nr);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_TEST_INTERVAL,
interval);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_TEST_MAX_MISS,
max);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_TEST_PERIOD,
period);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_TEST_MONITOR,
mrp->test_monitor);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_set_in_state(struct mrp *mrp,
enum br_mrp_in_state_type state)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_IN_STATE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_STATE_IN_ID,
mrp->in_id);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_STATE_STATE,
state);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_set_in_role(struct mrp *mrp, enum br_mrp_in_role_type role)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp->in_role = role;
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_IN_ROLE);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_ROLE_RING_ID,
mrp->ring_nr);
addattr16(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_ROLE_IN_ID,
mrp->in_id);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_ROLE_I_IFINDEX,
mrp->i_port->ifindex);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_IN_ROLE_ROLE,
role);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_send_in_test(struct mrp *mrp, uint32_t interval, uint32_t max,
uint32_t period)
{
struct rtattr *afspec, *afmrp, *af_submrp;
struct request req = { 0 };
mrp_nl_bridge_prepare(mrp->ifindex, RTM_SETLINK, &req, &afspec, &afmrp,
&af_submrp, IFLA_BRIDGE_MRP_START_IN_TEST);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_IN_TEST_IN_ID,
mrp->in_id);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_IN_TEST_INTERVAL,
interval);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_IN_TEST_MAX_MISS,
max);
addattr32(&req.n, sizeof(req), IFLA_BRIDGE_MRP_START_IN_TEST_PERIOD,
period);
return mrp_nl_terminate(&req, afspec, afmrp, af_submrp);
}
int mrp_netlink_flush(struct mrp *mrp)
{
struct request req = { 0 };
struct rtattr *protinfo;
req.n.nlmsg_len = NLMSG_LENGTH(sizeof(struct ifinfomsg));
req.n.nlmsg_flags = NLM_F_REQUEST;
req.n.nlmsg_type = RTM_SETLINK;
req.ifm.ifi_family = PF_BRIDGE;
protinfo = addattr_nest(&req.n, sizeof(req),
IFLA_PROTINFO | NLA_F_NESTED);
addattr(&req.n, 1024, IFLA_BRPORT_FLUSH);
addattr_nest_end(&req.n, protinfo);
req.ifm.ifi_index = mrp->p_port->ifindex;
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -1;
req.ifm.ifi_index = mrp->s_port->ifindex;
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -1;
if (!mrp->i_port)
return 0;
req.ifm.ifi_index = mrp->i_port->ifindex;
if (rtnl_talk(&rth, &req.n, NULL) < 0)
return -1;
return 0;
}