557 lines
13 KiB
C
557 lines
13 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* Author(s):
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* 2011-2014 Arvid Brodin, arvid.brodin@alten.se
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*
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* Routines for handling Netlink messages for HSR and PRP.
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*/
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#include "hsr_netlink.h"
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#include <linux/kernel.h>
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#include <net/rtnetlink.h>
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#include <net/genetlink.h>
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#include "hsr_main.h"
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#include "hsr_device.h"
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#include "hsr_framereg.h"
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static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = {
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[IFLA_HSR_SLAVE1] = { .type = NLA_U32 },
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[IFLA_HSR_SLAVE2] = { .type = NLA_U32 },
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[IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 },
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[IFLA_HSR_VERSION] = { .type = NLA_U8 },
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[IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN },
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[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
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[IFLA_HSR_PROTOCOL] = { .type = NLA_U8 },
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};
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/* Here, it seems a netdevice has already been allocated for us, and the
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* hsr_dev_setup routine has been executed. Nice!
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*/
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static int hsr_newlink(struct net *src_net, struct net_device *dev,
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struct nlattr *tb[], struct nlattr *data[],
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struct netlink_ext_ack *extack)
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{
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enum hsr_version proto_version;
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unsigned char multicast_spec;
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u8 proto = HSR_PROTOCOL_HSR;
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struct net_device *link[2];
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if (!data) {
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NL_SET_ERR_MSG_MOD(extack, "No slave devices specified");
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return -EINVAL;
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}
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if (!data[IFLA_HSR_SLAVE1]) {
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NL_SET_ERR_MSG_MOD(extack, "Slave1 device not specified");
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return -EINVAL;
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}
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link[0] = __dev_get_by_index(src_net,
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nla_get_u32(data[IFLA_HSR_SLAVE1]));
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if (!link[0]) {
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NL_SET_ERR_MSG_MOD(extack, "Slave1 does not exist");
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return -EINVAL;
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}
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if (!data[IFLA_HSR_SLAVE2]) {
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NL_SET_ERR_MSG_MOD(extack, "Slave2 device not specified");
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return -EINVAL;
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}
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link[1] = __dev_get_by_index(src_net,
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nla_get_u32(data[IFLA_HSR_SLAVE2]));
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if (!link[1]) {
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NL_SET_ERR_MSG_MOD(extack, "Slave2 does not exist");
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return -EINVAL;
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}
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if (link[0] == link[1]) {
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NL_SET_ERR_MSG_MOD(extack, "Slave1 and Slave2 are same");
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return -EINVAL;
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}
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if (!data[IFLA_HSR_MULTICAST_SPEC])
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multicast_spec = 0;
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else
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multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]);
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if (data[IFLA_HSR_PROTOCOL])
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proto = nla_get_u8(data[IFLA_HSR_PROTOCOL]);
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if (proto >= HSR_PROTOCOL_MAX) {
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NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol");
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return -EINVAL;
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}
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if (!data[IFLA_HSR_VERSION]) {
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proto_version = HSR_V0;
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} else {
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if (proto == HSR_PROTOCOL_PRP) {
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NL_SET_ERR_MSG_MOD(extack, "PRP version unsupported");
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return -EINVAL;
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}
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proto_version = nla_get_u8(data[IFLA_HSR_VERSION]);
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if (proto_version > HSR_V1) {
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NL_SET_ERR_MSG_MOD(extack,
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"Only HSR version 0/1 supported");
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return -EINVAL;
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}
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}
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if (proto == HSR_PROTOCOL_PRP)
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proto_version = PRP_V1;
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return hsr_dev_finalize(dev, link, multicast_spec, proto_version, extack);
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}
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static void hsr_dellink(struct net_device *dev, struct list_head *head)
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{
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struct hsr_priv *hsr = netdev_priv(dev);
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del_timer_sync(&hsr->prune_timer);
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del_timer_sync(&hsr->announce_timer);
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hsr_debugfs_term(hsr);
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hsr_del_ports(hsr);
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hsr_del_self_node(hsr);
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hsr_del_nodes(&hsr->node_db);
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unregister_netdevice_queue(dev, head);
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}
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static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev)
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{
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struct hsr_priv *hsr = netdev_priv(dev);
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u8 proto = HSR_PROTOCOL_HSR;
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struct hsr_port *port;
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
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if (port) {
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if (nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex))
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goto nla_put_failure;
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}
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
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if (port) {
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if (nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex))
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goto nla_put_failure;
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}
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if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN,
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hsr->sup_multicast_addr) ||
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nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr))
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goto nla_put_failure;
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if (hsr->prot_version == PRP_V1)
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proto = HSR_PROTOCOL_PRP;
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if (nla_put_u8(skb, IFLA_HSR_PROTOCOL, proto))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -EMSGSIZE;
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}
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static struct rtnl_link_ops hsr_link_ops __read_mostly = {
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.kind = "hsr",
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.maxtype = IFLA_HSR_MAX,
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.policy = hsr_policy,
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.priv_size = sizeof(struct hsr_priv),
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.setup = hsr_dev_setup,
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.newlink = hsr_newlink,
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.dellink = hsr_dellink,
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.fill_info = hsr_fill_info,
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};
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/* attribute policy */
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static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
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[HSR_A_NODE_ADDR] = { .len = ETH_ALEN },
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[HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN },
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[HSR_A_IFINDEX] = { .type = NLA_U32 },
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[HSR_A_IF1_AGE] = { .type = NLA_U32 },
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[HSR_A_IF2_AGE] = { .type = NLA_U32 },
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[HSR_A_IF1_SEQ] = { .type = NLA_U16 },
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[HSR_A_IF2_SEQ] = { .type = NLA_U16 },
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};
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static struct genl_family hsr_genl_family;
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static const struct genl_multicast_group hsr_mcgrps[] = {
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{ .name = "hsr-network", },
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};
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/* This is called if for some node with MAC address addr, we only get frames
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* over one of the slave interfaces. This would indicate an open network ring
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* (i.e. a link has failed somewhere).
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*/
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void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN],
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struct hsr_port *port)
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{
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struct sk_buff *skb;
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void *msg_head;
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struct hsr_port *master;
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int res;
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skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb)
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goto fail;
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msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0,
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HSR_C_RING_ERROR);
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if (!msg_head)
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goto nla_put_failure;
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res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
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if (res < 0)
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goto nla_put_failure;
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res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex);
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if (res < 0)
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goto nla_put_failure;
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genlmsg_end(skb, msg_head);
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genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
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return;
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nla_put_failure:
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kfree_skb(skb);
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fail:
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rcu_read_lock();
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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netdev_warn(master->dev, "Could not send HSR ring error message\n");
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rcu_read_unlock();
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}
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/* This is called when we haven't heard from the node with MAC address addr for
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* some time (just before the node is removed from the node table/list).
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*/
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void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN])
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{
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struct sk_buff *skb;
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void *msg_head;
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struct hsr_port *master;
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int res;
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skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb)
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goto fail;
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msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN);
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if (!msg_head)
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goto nla_put_failure;
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res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr);
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if (res < 0)
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goto nla_put_failure;
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genlmsg_end(skb, msg_head);
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genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC);
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return;
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nla_put_failure:
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kfree_skb(skb);
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fail:
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rcu_read_lock();
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master = hsr_port_get_hsr(hsr, HSR_PT_MASTER);
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netdev_warn(master->dev, "Could not send HSR node down\n");
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rcu_read_unlock();
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}
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/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table
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* about the status of a specific node in the network, defined by its MAC
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* address.
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*
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* Input: hsr ifindex, node mac address
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* Output: hsr ifindex, node mac address (copied from request),
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* age of latest frame from node over slave 1, slave 2 [ms]
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*/
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static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info)
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{
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/* For receiving */
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struct nlattr *na;
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struct net_device *hsr_dev;
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/* For sending */
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struct sk_buff *skb_out;
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void *msg_head;
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struct hsr_priv *hsr;
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struct hsr_port *port;
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unsigned char hsr_node_addr_b[ETH_ALEN];
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int hsr_node_if1_age;
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u16 hsr_node_if1_seq;
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int hsr_node_if2_age;
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u16 hsr_node_if2_seq;
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int addr_b_ifindex;
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int res;
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if (!info)
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goto invalid;
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na = info->attrs[HSR_A_IFINDEX];
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if (!na)
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goto invalid;
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na = info->attrs[HSR_A_NODE_ADDR];
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if (!na)
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goto invalid;
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rcu_read_lock();
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hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
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nla_get_u32(info->attrs[HSR_A_IFINDEX]));
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if (!hsr_dev)
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goto rcu_unlock;
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if (!is_hsr_master(hsr_dev))
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goto rcu_unlock;
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/* Send reply */
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC);
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if (!skb_out) {
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res = -ENOMEM;
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goto fail;
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}
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msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
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info->snd_seq, &hsr_genl_family, 0,
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HSR_C_SET_NODE_STATUS);
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if (!msg_head) {
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res = -ENOMEM;
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goto nla_put_failure;
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}
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res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
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if (res < 0)
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goto nla_put_failure;
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hsr = netdev_priv(hsr_dev);
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res = hsr_get_node_data(hsr,
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(unsigned char *)
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nla_data(info->attrs[HSR_A_NODE_ADDR]),
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hsr_node_addr_b,
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&addr_b_ifindex,
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&hsr_node_if1_age,
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&hsr_node_if1_seq,
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&hsr_node_if2_age,
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&hsr_node_if2_seq);
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if (res < 0)
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goto nla_put_failure;
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res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN,
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nla_data(info->attrs[HSR_A_NODE_ADDR]));
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if (res < 0)
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goto nla_put_failure;
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if (addr_b_ifindex > -1) {
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res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN,
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hsr_node_addr_b);
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if (res < 0)
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goto nla_put_failure;
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|
|
res = nla_put_u32(skb_out, HSR_A_ADDR_B_IFINDEX,
|
||
|
|
addr_b_ifindex);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
}
|
||
|
|
|
||
|
|
res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
|
||
|
|
if (port)
|
||
|
|
res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
|
||
|
|
port->dev->ifindex);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
|
||
|
|
res = nla_put_u32(skb_out, HSR_A_IF2_AGE, hsr_node_if2_age);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
|
||
|
|
if (port)
|
||
|
|
res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
|
||
|
|
port->dev->ifindex);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
|
||
|
|
rcu_read_unlock();
|
||
|
|
|
||
|
|
genlmsg_end(skb_out, msg_head);
|
||
|
|
genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
rcu_unlock:
|
||
|
|
rcu_read_unlock();
|
||
|
|
invalid:
|
||
|
|
netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
nla_put_failure:
|
||
|
|
kfree_skb(skb_out);
|
||
|
|
/* Fall through */
|
||
|
|
|
||
|
|
fail:
|
||
|
|
rcu_read_unlock();
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
/* Get a list of MacAddressA of all nodes known to this node (including self).
|
||
|
|
*/
|
||
|
|
static int hsr_get_node_list(struct sk_buff *skb_in, struct genl_info *info)
|
||
|
|
{
|
||
|
|
unsigned char addr[ETH_ALEN];
|
||
|
|
struct net_device *hsr_dev;
|
||
|
|
struct sk_buff *skb_out;
|
||
|
|
struct hsr_priv *hsr;
|
||
|
|
bool restart = false;
|
||
|
|
struct nlattr *na;
|
||
|
|
void *pos = NULL;
|
||
|
|
void *msg_head;
|
||
|
|
int res;
|
||
|
|
|
||
|
|
if (!info)
|
||
|
|
goto invalid;
|
||
|
|
|
||
|
|
na = info->attrs[HSR_A_IFINDEX];
|
||
|
|
if (!na)
|
||
|
|
goto invalid;
|
||
|
|
|
||
|
|
rcu_read_lock();
|
||
|
|
hsr_dev = dev_get_by_index_rcu(genl_info_net(info),
|
||
|
|
nla_get_u32(info->attrs[HSR_A_IFINDEX]));
|
||
|
|
if (!hsr_dev)
|
||
|
|
goto rcu_unlock;
|
||
|
|
if (!is_hsr_master(hsr_dev))
|
||
|
|
goto rcu_unlock;
|
||
|
|
|
||
|
|
restart:
|
||
|
|
/* Send reply */
|
||
|
|
skb_out = genlmsg_new(GENLMSG_DEFAULT_SIZE, GFP_ATOMIC);
|
||
|
|
if (!skb_out) {
|
||
|
|
res = -ENOMEM;
|
||
|
|
goto fail;
|
||
|
|
}
|
||
|
|
|
||
|
|
msg_head = genlmsg_put(skb_out, NETLINK_CB(skb_in).portid,
|
||
|
|
info->snd_seq, &hsr_genl_family, 0,
|
||
|
|
HSR_C_SET_NODE_LIST);
|
||
|
|
if (!msg_head) {
|
||
|
|
res = -ENOMEM;
|
||
|
|
goto nla_put_failure;
|
||
|
|
}
|
||
|
|
|
||
|
|
if (!restart) {
|
||
|
|
res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex);
|
||
|
|
if (res < 0)
|
||
|
|
goto nla_put_failure;
|
||
|
|
}
|
||
|
|
|
||
|
|
hsr = netdev_priv(hsr_dev);
|
||
|
|
|
||
|
|
if (!pos)
|
||
|
|
pos = hsr_get_next_node(hsr, NULL, addr);
|
||
|
|
while (pos) {
|
||
|
|
res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
|
||
|
|
if (res < 0) {
|
||
|
|
if (res == -EMSGSIZE) {
|
||
|
|
genlmsg_end(skb_out, msg_head);
|
||
|
|
genlmsg_unicast(genl_info_net(info), skb_out,
|
||
|
|
info->snd_portid);
|
||
|
|
restart = true;
|
||
|
|
goto restart;
|
||
|
|
}
|
||
|
|
goto nla_put_failure;
|
||
|
|
}
|
||
|
|
pos = hsr_get_next_node(hsr, pos, addr);
|
||
|
|
}
|
||
|
|
rcu_read_unlock();
|
||
|
|
|
||
|
|
genlmsg_end(skb_out, msg_head);
|
||
|
|
genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
|
||
|
|
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
rcu_unlock:
|
||
|
|
rcu_read_unlock();
|
||
|
|
invalid:
|
||
|
|
netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL, NULL);
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
nla_put_failure:
|
||
|
|
nlmsg_free(skb_out);
|
||
|
|
/* Fall through */
|
||
|
|
|
||
|
|
fail:
|
||
|
|
rcu_read_unlock();
|
||
|
|
return res;
|
||
|
|
}
|
||
|
|
|
||
|
|
static const struct genl_small_ops hsr_ops[] = {
|
||
|
|
{
|
||
|
|
.cmd = HSR_C_GET_NODE_STATUS,
|
||
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
||
|
|
.flags = 0,
|
||
|
|
.doit = hsr_get_node_status,
|
||
|
|
.dumpit = NULL,
|
||
|
|
},
|
||
|
|
{
|
||
|
|
.cmd = HSR_C_GET_NODE_LIST,
|
||
|
|
.validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP,
|
||
|
|
.flags = 0,
|
||
|
|
.doit = hsr_get_node_list,
|
||
|
|
.dumpit = NULL,
|
||
|
|
},
|
||
|
|
};
|
||
|
|
|
||
|
|
static struct genl_family hsr_genl_family __ro_after_init = {
|
||
|
|
.hdrsize = 0,
|
||
|
|
.name = "HSR",
|
||
|
|
.version = 1,
|
||
|
|
.maxattr = HSR_A_MAX,
|
||
|
|
.policy = hsr_genl_policy,
|
||
|
|
.netnsok = true,
|
||
|
|
.module = THIS_MODULE,
|
||
|
|
.small_ops = hsr_ops,
|
||
|
|
.n_small_ops = ARRAY_SIZE(hsr_ops),
|
||
|
|
.resv_start_op = HSR_C_SET_NODE_LIST + 1,
|
||
|
|
.mcgrps = hsr_mcgrps,
|
||
|
|
.n_mcgrps = ARRAY_SIZE(hsr_mcgrps),
|
||
|
|
};
|
||
|
|
|
||
|
|
int __init hsr_netlink_init(void)
|
||
|
|
{
|
||
|
|
int rc;
|
||
|
|
|
||
|
|
rc = rtnl_link_register(&hsr_link_ops);
|
||
|
|
if (rc)
|
||
|
|
goto fail_rtnl_link_register;
|
||
|
|
|
||
|
|
rc = genl_register_family(&hsr_genl_family);
|
||
|
|
if (rc)
|
||
|
|
goto fail_genl_register_family;
|
||
|
|
|
||
|
|
hsr_debugfs_create_root();
|
||
|
|
return 0;
|
||
|
|
|
||
|
|
fail_genl_register_family:
|
||
|
|
rtnl_link_unregister(&hsr_link_ops);
|
||
|
|
fail_rtnl_link_register:
|
||
|
|
|
||
|
|
return rc;
|
||
|
|
}
|
||
|
|
|
||
|
|
void __exit hsr_netlink_exit(void)
|
||
|
|
{
|
||
|
|
genl_unregister_family(&hsr_genl_family);
|
||
|
|
rtnl_link_unregister(&hsr_link_ops);
|
||
|
|
}
|
||
|
|
|
||
|
|
MODULE_ALIAS_RTNL_LINK("hsr");
|