diff options
Diffstat (limited to 'net/hsr/hsr_netlink.c')
| -rw-r--r-- | net/hsr/hsr_netlink.c | 556 |
1 files changed, 556 insertions, 0 deletions
diff --git a/net/hsr/hsr_netlink.c b/net/hsr/hsr_netlink.c new file mode 100644 index 000000000..78fe40eb9 --- /dev/null +++ b/net/hsr/hsr_netlink.c @@ -0,0 +1,556 @@ +// SPDX-License-Identifier: GPL-2.0 +/* Copyright 2011-2014 Autronica Fire and Security AS + * + * Author(s): + * 2011-2014 Arvid Brodin, arvid.brodin@alten.se + * + * Routines for handling Netlink messages for HSR and PRP. + */ + +#include "hsr_netlink.h" +#include <linux/kernel.h> +#include <net/rtnetlink.h> +#include <net/genetlink.h> +#include "hsr_main.h" +#include "hsr_device.h" +#include "hsr_framereg.h" + +static const struct nla_policy hsr_policy[IFLA_HSR_MAX + 1] = { + [IFLA_HSR_SLAVE1] = { .type = NLA_U32 }, + [IFLA_HSR_SLAVE2] = { .type = NLA_U32 }, + [IFLA_HSR_MULTICAST_SPEC] = { .type = NLA_U8 }, + [IFLA_HSR_VERSION] = { .type = NLA_U8 }, + [IFLA_HSR_SUPERVISION_ADDR] = { .len = ETH_ALEN }, + [IFLA_HSR_SEQ_NR] = { .type = NLA_U16 }, + [IFLA_HSR_PROTOCOL] = { .type = NLA_U8 }, +}; + +/* Here, it seems a netdevice has already been allocated for us, and the + * hsr_dev_setup routine has been executed. Nice! + */ +static int hsr_newlink(struct net *src_net, struct net_device *dev, + struct nlattr *tb[], struct nlattr *data[], + struct netlink_ext_ack *extack) +{ + enum hsr_version proto_version; + unsigned char multicast_spec; + u8 proto = HSR_PROTOCOL_HSR; + struct net_device *link[2]; + + if (!data) { + NL_SET_ERR_MSG_MOD(extack, "No slave devices specified"); + return -EINVAL; + } + if (!data[IFLA_HSR_SLAVE1]) { + NL_SET_ERR_MSG_MOD(extack, "Slave1 device not specified"); + return -EINVAL; + } + link[0] = __dev_get_by_index(src_net, + nla_get_u32(data[IFLA_HSR_SLAVE1])); + if (!link[0]) { + NL_SET_ERR_MSG_MOD(extack, "Slave1 does not exist"); + return -EINVAL; + } + if (!data[IFLA_HSR_SLAVE2]) { + NL_SET_ERR_MSG_MOD(extack, "Slave2 device not specified"); + return -EINVAL; + } + link[1] = __dev_get_by_index(src_net, + nla_get_u32(data[IFLA_HSR_SLAVE2])); + if (!link[1]) { + NL_SET_ERR_MSG_MOD(extack, "Slave2 does not exist"); + return -EINVAL; + } + + if (link[0] == link[1]) { + NL_SET_ERR_MSG_MOD(extack, "Slave1 and Slave2 are same"); + return -EINVAL; + } + + if (!data[IFLA_HSR_MULTICAST_SPEC]) + multicast_spec = 0; + else + multicast_spec = nla_get_u8(data[IFLA_HSR_MULTICAST_SPEC]); + + if (data[IFLA_HSR_PROTOCOL]) + proto = nla_get_u8(data[IFLA_HSR_PROTOCOL]); + + if (proto >= HSR_PROTOCOL_MAX) { + NL_SET_ERR_MSG_MOD(extack, "Unsupported protocol"); + return -EINVAL; + } + + if (!data[IFLA_HSR_VERSION]) { + proto_version = HSR_V0; + } else { + if (proto == HSR_PROTOCOL_PRP) { + NL_SET_ERR_MSG_MOD(extack, "PRP version unsupported"); + return -EINVAL; + } + + proto_version = nla_get_u8(data[IFLA_HSR_VERSION]); + if (proto_version > HSR_V1) { + NL_SET_ERR_MSG_MOD(extack, + "Only HSR version 0/1 supported"); + return -EINVAL; + } + } + + if (proto == HSR_PROTOCOL_PRP) + proto_version = PRP_V1; + + return hsr_dev_finalize(dev, link, multicast_spec, proto_version, extack); +} + +static void hsr_dellink(struct net_device *dev, struct list_head *head) +{ + struct hsr_priv *hsr = netdev_priv(dev); + + del_timer_sync(&hsr->prune_timer); + del_timer_sync(&hsr->announce_timer); + + hsr_debugfs_term(hsr); + hsr_del_ports(hsr); + + hsr_del_self_node(hsr); + hsr_del_nodes(&hsr->node_db); + + unregister_netdevice_queue(dev, head); +} + +static int hsr_fill_info(struct sk_buff *skb, const struct net_device *dev) +{ + struct hsr_priv *hsr = netdev_priv(dev); + u8 proto = HSR_PROTOCOL_HSR; + struct hsr_port *port; + + port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_A); + if (port) { + if (nla_put_u32(skb, IFLA_HSR_SLAVE1, port->dev->ifindex)) + goto nla_put_failure; + } + + port = hsr_port_get_hsr(hsr, HSR_PT_SLAVE_B); + if (port) { + if (nla_put_u32(skb, IFLA_HSR_SLAVE2, port->dev->ifindex)) + goto nla_put_failure; + } + + if (nla_put(skb, IFLA_HSR_SUPERVISION_ADDR, ETH_ALEN, + hsr->sup_multicast_addr) || + nla_put_u16(skb, IFLA_HSR_SEQ_NR, hsr->sequence_nr)) + goto nla_put_failure; + if (hsr->prot_version == PRP_V1) + proto = HSR_PROTOCOL_PRP; + if (nla_put_u8(skb, IFLA_HSR_PROTOCOL, proto)) + goto nla_put_failure; + + return 0; + +nla_put_failure: + return -EMSGSIZE; +} + +static struct rtnl_link_ops hsr_link_ops __read_mostly = { + .kind = "hsr", + .maxtype = IFLA_HSR_MAX, + .policy = hsr_policy, + .priv_size = sizeof(struct hsr_priv), + .setup = hsr_dev_setup, + .newlink = hsr_newlink, + .dellink = hsr_dellink, + .fill_info = hsr_fill_info, +}; + +/* attribute policy */ +static const struct nla_policy hsr_genl_policy[HSR_A_MAX + 1] = { + [HSR_A_NODE_ADDR] = { .len = ETH_ALEN }, + [HSR_A_NODE_ADDR_B] = { .len = ETH_ALEN }, + [HSR_A_IFINDEX] = { .type = NLA_U32 }, + [HSR_A_IF1_AGE] = { .type = NLA_U32 }, + [HSR_A_IF2_AGE] = { .type = NLA_U32 }, + [HSR_A_IF1_SEQ] = { .type = NLA_U16 }, + [HSR_A_IF2_SEQ] = { .type = NLA_U16 }, +}; + +static struct genl_family hsr_genl_family; + +static const struct genl_multicast_group hsr_mcgrps[] = { + { .name = "hsr-network", }, +}; + +/* This is called if for some node with MAC address addr, we only get frames + * over one of the slave interfaces. This would indicate an open network ring + * (i.e. a link has failed somewhere). + */ +void hsr_nl_ringerror(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN], + struct hsr_port *port) +{ + struct sk_buff *skb; + void *msg_head; + struct hsr_port *master; + int res; + + skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); + if (!skb) + goto fail; + + msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, + HSR_C_RING_ERROR); + if (!msg_head) + goto nla_put_failure; + + res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); + if (res < 0) + goto nla_put_failure; + + res = nla_put_u32(skb, HSR_A_IFINDEX, port->dev->ifindex); + if (res < 0) + goto nla_put_failure; + + genlmsg_end(skb, msg_head); + genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC); + + return; + +nla_put_failure: + kfree_skb(skb); + +fail: + rcu_read_lock(); + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + netdev_warn(master->dev, "Could not send HSR ring error message\n"); + rcu_read_unlock(); +} + +/* This is called when we haven't heard from the node with MAC address addr for + * some time (just before the node is removed from the node table/list). + */ +void hsr_nl_nodedown(struct hsr_priv *hsr, unsigned char addr[ETH_ALEN]) +{ + struct sk_buff *skb; + void *msg_head; + struct hsr_port *master; + int res; + + skb = genlmsg_new(NLMSG_GOODSIZE, GFP_ATOMIC); + if (!skb) + goto fail; + + msg_head = genlmsg_put(skb, 0, 0, &hsr_genl_family, 0, HSR_C_NODE_DOWN); + if (!msg_head) + goto nla_put_failure; + + res = nla_put(skb, HSR_A_NODE_ADDR, ETH_ALEN, addr); + if (res < 0) + goto nla_put_failure; + + genlmsg_end(skb, msg_head); + genlmsg_multicast(&hsr_genl_family, skb, 0, 0, GFP_ATOMIC); + + return; + +nla_put_failure: + kfree_skb(skb); + +fail: + rcu_read_lock(); + master = hsr_port_get_hsr(hsr, HSR_PT_MASTER); + netdev_warn(master->dev, "Could not send HSR node down\n"); + rcu_read_unlock(); +} + +/* HSR_C_GET_NODE_STATUS lets userspace query the internal HSR node table + * about the status of a specific node in the network, defined by its MAC + * address. + * + * Input: hsr ifindex, node mac address + * Output: hsr ifindex, node mac address (copied from request), + * age of latest frame from node over slave 1, slave 2 [ms] + */ +static int hsr_get_node_status(struct sk_buff *skb_in, struct genl_info *info) +{ + /* For receiving */ + struct nlattr *na; + struct net_device *hsr_dev; + + /* For sending */ + struct sk_buff *skb_out; + void *msg_head; + struct hsr_priv *hsr; + struct hsr_port *port; + unsigned char hsr_node_addr_b[ETH_ALEN]; + int hsr_node_if1_age; + u16 hsr_node_if1_seq; + int hsr_node_if2_age; + u16 hsr_node_if2_seq; + int addr_b_ifindex; + int res; + + if (!info) + goto invalid; + + na = info->attrs[HSR_A_IFINDEX]; + if (!na) + goto invalid; + na = info->attrs[HSR_A_NODE_ADDR]; + 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; + + /* Send reply */ + skb_out = genlmsg_new(NLMSG_GOODSIZE, 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_STATUS); + if (!msg_head) { + res = -ENOMEM; + goto nla_put_failure; + } + + res = nla_put_u32(skb_out, HSR_A_IFINDEX, hsr_dev->ifindex); + if (res < 0) + goto nla_put_failure; + + hsr = netdev_priv(hsr_dev); + res = hsr_get_node_data(hsr, + (unsigned char *) + nla_data(info->attrs[HSR_A_NODE_ADDR]), + hsr_node_addr_b, + &addr_b_ifindex, + &hsr_node_if1_age, + &hsr_node_if1_seq, + &hsr_node_if2_age, + &hsr_node_if2_seq); + if (res < 0) + goto nla_put_failure; + + res = nla_put(skb_out, HSR_A_NODE_ADDR, ETH_ALEN, + nla_data(info->attrs[HSR_A_NODE_ADDR])); + if (res < 0) + goto nla_put_failure; + + if (addr_b_ifindex > -1) { + res = nla_put(skb_out, HSR_A_NODE_ADDR_B, ETH_ALEN, + hsr_node_addr_b); + if (res < 0) + goto nla_put_failure; + + 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"); |