494 lines
11 KiB
C
494 lines
11 KiB
C
/* Copyright 2011-2014 Autronica Fire and Security AS
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the Free
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* Software Foundation; either version 2 of the License, or (at your option)
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* any later version.
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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.
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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_SUPERVISION_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN },
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[IFLA_HSR_SEQ_NR] = { .type = NLA_U16 },
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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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{
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struct net_device *link[2];
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unsigned char multicast_spec;
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if (!data) {
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netdev_info(dev, "HSR: No slave devices specified\n");
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return -EINVAL;
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}
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if (!data[IFLA_HSR_SLAVE1]) {
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netdev_info(dev, "HSR: Slave1 device not specified\n");
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return -EINVAL;
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}
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link[0] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE1]));
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if (!data[IFLA_HSR_SLAVE2]) {
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netdev_info(dev, "HSR: Slave2 device not specified\n");
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return -EINVAL;
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}
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link[1] = __dev_get_by_index(src_net, nla_get_u32(data[IFLA_HSR_SLAVE2]));
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if (!link[0] || !link[1])
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return -ENODEV;
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if (link[0] == link[1])
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return -EINVAL;
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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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return hsr_dev_finalize(dev, link, multicast_spec);
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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;
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struct hsr_port *port;
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int res;
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hsr = netdev_priv(dev);
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res = 0;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
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if (port)
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res = nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex);
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rcu_read_unlock();
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if (res)
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goto nla_put_failure;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
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if (port)
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res = nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex);
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rcu_read_unlock();
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if (res)
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goto nla_put_failure;
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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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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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.fill_info = hsr_fill_info,
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};
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/* attribute policy */
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/* NLA_BINARY missing in libnl; use NLA_UNSPEC in userspace instead. */
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static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = {
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[HSR_A_NODE_ADDR] = { .type = NLA_BINARY, .len = ETH_ALEN },
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[HSR_A_NODE_ADDR_B] = { .type = NLA_BINARY, .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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.id = GENL_ID_GENERATE,
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.hdrsize = 0,
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.name = "HSR",
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.version = 1,
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.maxattr = HSR_A_MAX,
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};
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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, 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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hsr_dev = __dev_get_by_index(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 invalid;
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if (!is_hsr_master(hsr_dev))
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goto invalid;
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/* Send reply */
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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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 *) 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);
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if (res < 0)
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goto nla_put_failure;
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}
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res = nla_put_u32(skb_out, HSR_A_IF1_AGE, hsr_node_if1_age);
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if (res < 0)
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goto nla_put_failure;
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res = nla_put_u16(skb_out, HSR_A_IF1_SEQ, hsr_node_if1_seq);
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if (res < 0)
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goto nla_put_failure;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A);
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if (port)
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res = nla_put_u32(skb_out, HSR_A_IF1_IFINDEX,
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port->dev->ifindex);
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rcu_read_unlock();
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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_IF2_AGE, hsr_node_if2_age);
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if (res < 0)
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goto nla_put_failure;
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res = nla_put_u16(skb_out, HSR_A_IF2_SEQ, hsr_node_if2_seq);
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if (res < 0)
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goto nla_put_failure;
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rcu_read_lock();
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port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B);
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if (port)
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res = nla_put_u32(skb_out, HSR_A_IF2_IFINDEX,
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port->dev->ifindex);
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rcu_read_unlock();
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if (res < 0)
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goto nla_put_failure;
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genlmsg_end(skb_out, msg_head);
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genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
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return 0;
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invalid:
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netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
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return 0;
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nla_put_failure:
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kfree_skb(skb_out);
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/* Fall through */
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fail:
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return res;
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}
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/* Get a list of MacAddressA of all nodes known to this node (including self).
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*/
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static int hsr_get_node_list(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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void *pos;
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unsigned char addr[ETH_ALEN];
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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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hsr_dev = __dev_get_by_index(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 invalid;
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if (!is_hsr_master(hsr_dev))
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goto invalid;
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/* Send reply */
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skb_out = genlmsg_new(NLMSG_GOODSIZE, GFP_KERNEL);
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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_LIST);
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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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rcu_read_lock();
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pos = hsr_get_next_node(hsr, NULL, addr);
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while (pos) {
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res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, addr);
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if (res < 0) {
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rcu_read_unlock();
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goto nla_put_failure;
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}
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pos = hsr_get_next_node(hsr, pos, addr);
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}
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rcu_read_unlock();
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genlmsg_end(skb_out, msg_head);
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genlmsg_unicast(genl_info_net(info), skb_out, info->snd_portid);
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return 0;
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invalid:
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netlink_ack(skb_in, nlmsg_hdr(skb_in), -EINVAL);
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return 0;
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nla_put_failure:
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kfree_skb(skb_out);
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/* Fall through */
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fail:
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return res;
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}
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static const struct genl_ops hsr_ops[] = {
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{
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.cmd = HSR_C_GET_NODE_STATUS,
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.flags = 0,
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.policy = hsr_genl_policy,
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.doit = hsr_get_node_status,
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.dumpit = NULL,
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},
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{
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.cmd = HSR_C_GET_NODE_LIST,
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.flags = 0,
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.policy = hsr_genl_policy,
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.doit = hsr_get_node_list,
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.dumpit = NULL,
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},
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};
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int __init hsr_netlink_init(void)
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{
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int rc;
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rc = rtnl_link_register(&hsr_link_ops);
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if (rc)
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goto fail_rtnl_link_register;
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rc = genl_register_family_with_ops_groups(&hsr_genl_family, hsr_ops,
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hsr_mcgrps);
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if (rc)
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goto fail_genl_register_family;
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return 0;
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fail_genl_register_family:
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rtnl_link_unregister(&hsr_link_ops);
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fail_rtnl_link_register:
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return rc;
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}
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void __exit hsr_netlink_exit(void)
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{
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genl_unregister_family(&hsr_genl_family);
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rtnl_link_unregister(&hsr_link_ops);
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}
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MODULE_ALIAS_RTNL_LINK("hsr");
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