| /* |
| * Copyright (c) 2007-2012 Nicira, Inc. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms of version 2 of the GNU General Public |
| * License as published by the Free Software Foundation. |
| * |
| * This program is distributed in the hope that it will be useful, but |
| * WITHOUT ANY WARRANTY; without even the implied warranty of |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| * General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write to the Free Software |
| * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| * 02110-1301, USA |
| */ |
| |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/init.h> |
| #include <linux/module.h> |
| #include <linux/if_arp.h> |
| #include <linux/if_vlan.h> |
| #include <linux/in.h> |
| #include <linux/ip.h> |
| #include <linux/jhash.h> |
| #include <linux/delay.h> |
| #include <linux/time.h> |
| #include <linux/etherdevice.h> |
| #include <linux/genetlink.h> |
| #include <linux/kernel.h> |
| #include <linux/kthread.h> |
| #include <linux/mutex.h> |
| #include <linux/percpu.h> |
| #include <linux/rcupdate.h> |
| #include <linux/tcp.h> |
| #include <linux/udp.h> |
| #include <linux/ethtool.h> |
| #include <linux/wait.h> |
| #include <asm/div64.h> |
| #include <linux/highmem.h> |
| #include <linux/netfilter_bridge.h> |
| #include <linux/netfilter_ipv4.h> |
| #include <linux/inetdevice.h> |
| #include <linux/list.h> |
| #include <linux/openvswitch.h> |
| #include <linux/rculist.h> |
| #include <linux/dmi.h> |
| #include <linux/workqueue.h> |
| #include <net/genetlink.h> |
| |
| #include "datapath.h" |
| #include "flow.h" |
| #include "vport-internal_dev.h" |
| |
| /** |
| * DOC: Locking: |
| * |
| * Writes to device state (add/remove datapath, port, set operations on vports, |
| * etc.) are protected by RTNL. |
| * |
| * Writes to other state (flow table modifications, set miscellaneous datapath |
| * parameters, etc.) are protected by genl_mutex. The RTNL lock nests inside |
| * genl_mutex. |
| * |
| * Reads are protected by RCU. |
| * |
| * There are a few special cases (mostly stats) that have their own |
| * synchronization but they nest under all of above and don't interact with |
| * each other. |
| */ |
| |
| /* Global list of datapaths to enable dumping them all out. |
| * Protected by genl_mutex. |
| */ |
| static LIST_HEAD(dps); |
| |
| #define REHASH_FLOW_INTERVAL (10 * 60 * HZ) |
| static void rehash_flow_table(struct work_struct *work); |
| static DECLARE_DELAYED_WORK(rehash_flow_wq, rehash_flow_table); |
| |
| static struct vport *new_vport(const struct vport_parms *); |
| static int queue_gso_packets(int dp_ifindex, struct sk_buff *, |
| const struct dp_upcall_info *); |
| static int queue_userspace_packet(int dp_ifindex, struct sk_buff *, |
| const struct dp_upcall_info *); |
| |
| /* Must be called with rcu_read_lock, genl_mutex, or RTNL lock. */ |
| static struct datapath *get_dp(int dp_ifindex) |
| { |
| struct datapath *dp = NULL; |
| struct net_device *dev; |
| |
| rcu_read_lock(); |
| dev = dev_get_by_index_rcu(&init_net, dp_ifindex); |
| if (dev) { |
| struct vport *vport = ovs_internal_dev_get_vport(dev); |
| if (vport) |
| dp = vport->dp; |
| } |
| rcu_read_unlock(); |
| |
| return dp; |
| } |
| |
| /* Must be called with rcu_read_lock or RTNL lock. */ |
| const char *ovs_dp_name(const struct datapath *dp) |
| { |
| struct vport *vport = rcu_dereference_rtnl(dp->ports[OVSP_LOCAL]); |
| return vport->ops->get_name(vport); |
| } |
| |
| static int get_dpifindex(struct datapath *dp) |
| { |
| struct vport *local; |
| int ifindex; |
| |
| rcu_read_lock(); |
| |
| local = rcu_dereference(dp->ports[OVSP_LOCAL]); |
| if (local) |
| ifindex = local->ops->get_ifindex(local); |
| else |
| ifindex = 0; |
| |
| rcu_read_unlock(); |
| |
| return ifindex; |
| } |
| |
| static void destroy_dp_rcu(struct rcu_head *rcu) |
| { |
| struct datapath *dp = container_of(rcu, struct datapath, rcu); |
| |
| ovs_flow_tbl_destroy((__force struct flow_table *)dp->table); |
| free_percpu(dp->stats_percpu); |
| kfree(dp); |
| } |
| |
| /* Called with RTNL lock and genl_lock. */ |
| static struct vport *new_vport(const struct vport_parms *parms) |
| { |
| struct vport *vport; |
| |
| vport = ovs_vport_add(parms); |
| if (!IS_ERR(vport)) { |
| struct datapath *dp = parms->dp; |
| |
| rcu_assign_pointer(dp->ports[parms->port_no], vport); |
| list_add(&vport->node, &dp->port_list); |
| } |
| |
| return vport; |
| } |
| |
| /* Called with RTNL lock. */ |
| void ovs_dp_detach_port(struct vport *p) |
| { |
| ASSERT_RTNL(); |
| |
| /* First drop references to device. */ |
| list_del(&p->node); |
| rcu_assign_pointer(p->dp->ports[p->port_no], NULL); |
| |
| /* Then destroy it. */ |
| ovs_vport_del(p); |
| } |
| |
| /* Must be called with rcu_read_lock. */ |
| void ovs_dp_process_received_packet(struct vport *p, struct sk_buff *skb) |
| { |
| struct datapath *dp = p->dp; |
| struct sw_flow *flow; |
| struct dp_stats_percpu *stats; |
| struct sw_flow_key key; |
| u64 *stats_counter; |
| int error; |
| int key_len; |
| |
| stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); |
| |
| /* Extract flow from 'skb' into 'key'. */ |
| error = ovs_flow_extract(skb, p->port_no, &key, &key_len); |
| if (unlikely(error)) { |
| kfree_skb(skb); |
| return; |
| } |
| |
| /* Look up flow. */ |
| flow = ovs_flow_tbl_lookup(rcu_dereference(dp->table), &key, key_len); |
| if (unlikely(!flow)) { |
| struct dp_upcall_info upcall; |
| |
| upcall.cmd = OVS_PACKET_CMD_MISS; |
| upcall.key = &key; |
| upcall.userdata = NULL; |
| upcall.pid = p->upcall_pid; |
| ovs_dp_upcall(dp, skb, &upcall); |
| consume_skb(skb); |
| stats_counter = &stats->n_missed; |
| goto out; |
| } |
| |
| OVS_CB(skb)->flow = flow; |
| |
| stats_counter = &stats->n_hit; |
| ovs_flow_used(OVS_CB(skb)->flow, skb); |
| ovs_execute_actions(dp, skb); |
| |
| out: |
| /* Update datapath statistics. */ |
| u64_stats_update_begin(&stats->sync); |
| (*stats_counter)++; |
| u64_stats_update_end(&stats->sync); |
| } |
| |
| static struct genl_family dp_packet_genl_family = { |
| .id = GENL_ID_GENERATE, |
| .hdrsize = sizeof(struct ovs_header), |
| .name = OVS_PACKET_FAMILY, |
| .version = OVS_PACKET_VERSION, |
| .maxattr = OVS_PACKET_ATTR_MAX |
| }; |
| |
| int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, |
| const struct dp_upcall_info *upcall_info) |
| { |
| struct dp_stats_percpu *stats; |
| int dp_ifindex; |
| int err; |
| |
| if (upcall_info->pid == 0) { |
| err = -ENOTCONN; |
| goto err; |
| } |
| |
| dp_ifindex = get_dpifindex(dp); |
| if (!dp_ifindex) { |
| err = -ENODEV; |
| goto err; |
| } |
| |
| if (!skb_is_gso(skb)) |
| err = queue_userspace_packet(dp_ifindex, skb, upcall_info); |
| else |
| err = queue_gso_packets(dp_ifindex, skb, upcall_info); |
| if (err) |
| goto err; |
| |
| return 0; |
| |
| err: |
| stats = per_cpu_ptr(dp->stats_percpu, smp_processor_id()); |
| |
| u64_stats_update_begin(&stats->sync); |
| stats->n_lost++; |
| u64_stats_update_end(&stats->sync); |
| |
| return err; |
| } |
| |
| static int queue_gso_packets(int dp_ifindex, struct sk_buff *skb, |
| const struct dp_upcall_info *upcall_info) |
| { |
| struct dp_upcall_info later_info; |
| struct sw_flow_key later_key; |
| struct sk_buff *segs, *nskb; |
| int err; |
| |
| segs = skb_gso_segment(skb, NETIF_F_SG | NETIF_F_HW_CSUM); |
| if (IS_ERR(skb)) |
| return PTR_ERR(skb); |
| |
| /* Queue all of the segments. */ |
| skb = segs; |
| do { |
| err = queue_userspace_packet(dp_ifindex, skb, upcall_info); |
| if (err) |
| break; |
| |
| if (skb == segs && skb_shinfo(skb)->gso_type & SKB_GSO_UDP) { |
| /* The initial flow key extracted by ovs_flow_extract() |
| * in this case is for a first fragment, so we need to |
| * properly mark later fragments. |
| */ |
| later_key = *upcall_info->key; |
| later_key.ip.frag = OVS_FRAG_TYPE_LATER; |
| |
| later_info = *upcall_info; |
| later_info.key = &later_key; |
| upcall_info = &later_info; |
| } |
| } while ((skb = skb->next)); |
| |
| /* Free all of the segments. */ |
| skb = segs; |
| do { |
| nskb = skb->next; |
| if (err) |
| kfree_skb(skb); |
| else |
| consume_skb(skb); |
| } while ((skb = nskb)); |
| return err; |
| } |
| |
| static int queue_userspace_packet(int dp_ifindex, struct sk_buff *skb, |
| const struct dp_upcall_info *upcall_info) |
| { |
| struct ovs_header *upcall; |
| struct sk_buff *nskb = NULL; |
| struct sk_buff *user_skb; /* to be queued to userspace */ |
| struct nlattr *nla; |
| unsigned int len; |
| int err; |
| |
| if (vlan_tx_tag_present(skb)) { |
| nskb = skb_clone(skb, GFP_ATOMIC); |
| if (!nskb) |
| return -ENOMEM; |
| |
| nskb = __vlan_put_tag(nskb, vlan_tx_tag_get(nskb)); |
| if (!skb) |
| return -ENOMEM; |
| |
| nskb->vlan_tci = 0; |
| skb = nskb; |
| } |
| |
| if (nla_attr_size(skb->len) > USHRT_MAX) { |
| err = -EFBIG; |
| goto out; |
| } |
| |
| len = sizeof(struct ovs_header); |
| len += nla_total_size(skb->len); |
| len += nla_total_size(FLOW_BUFSIZE); |
| if (upcall_info->cmd == OVS_PACKET_CMD_ACTION) |
| len += nla_total_size(8); |
| |
| user_skb = genlmsg_new(len, GFP_ATOMIC); |
| if (!user_skb) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, |
| 0, upcall_info->cmd); |
| upcall->dp_ifindex = dp_ifindex; |
| |
| nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_KEY); |
| ovs_flow_to_nlattrs(upcall_info->key, user_skb); |
| nla_nest_end(user_skb, nla); |
| |
| if (upcall_info->userdata) |
| nla_put_u64(user_skb, OVS_PACKET_ATTR_USERDATA, |
| nla_get_u64(upcall_info->userdata)); |
| |
| nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); |
| |
| skb_copy_and_csum_dev(skb, nla_data(nla)); |
| |
| err = genlmsg_unicast(&init_net, user_skb, upcall_info->pid); |
| |
| out: |
| kfree_skb(nskb); |
| return err; |
| } |
| |
| /* Called with genl_mutex. */ |
| static int flush_flows(int dp_ifindex) |
| { |
| struct flow_table *old_table; |
| struct flow_table *new_table; |
| struct datapath *dp; |
| |
| dp = get_dp(dp_ifindex); |
| if (!dp) |
| return -ENODEV; |
| |
| old_table = genl_dereference(dp->table); |
| new_table = ovs_flow_tbl_alloc(TBL_MIN_BUCKETS); |
| if (!new_table) |
| return -ENOMEM; |
| |
| rcu_assign_pointer(dp->table, new_table); |
| |
| ovs_flow_tbl_deferred_destroy(old_table); |
| return 0; |
| } |
| |
| static int validate_actions(const struct nlattr *attr, |
| const struct sw_flow_key *key, int depth); |
| |
| static int validate_sample(const struct nlattr *attr, |
| const struct sw_flow_key *key, int depth) |
| { |
| const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; |
| const struct nlattr *probability, *actions; |
| const struct nlattr *a; |
| int rem; |
| |
| memset(attrs, 0, sizeof(attrs)); |
| nla_for_each_nested(a, attr, rem) { |
| int type = nla_type(a); |
| if (!type || type > OVS_SAMPLE_ATTR_MAX || attrs[type]) |
| return -EINVAL; |
| attrs[type] = a; |
| } |
| if (rem) |
| return -EINVAL; |
| |
| probability = attrs[OVS_SAMPLE_ATTR_PROBABILITY]; |
| if (!probability || nla_len(probability) != sizeof(u32)) |
| return -EINVAL; |
| |
| actions = attrs[OVS_SAMPLE_ATTR_ACTIONS]; |
| if (!actions || (nla_len(actions) && nla_len(actions) < NLA_HDRLEN)) |
| return -EINVAL; |
| return validate_actions(actions, key, depth + 1); |
| } |
| |
| static int validate_set(const struct nlattr *a, |
| const struct sw_flow_key *flow_key) |
| { |
| const struct nlattr *ovs_key = nla_data(a); |
| int key_type = nla_type(ovs_key); |
| |
| /* There can be only one key in a action */ |
| if (nla_total_size(nla_len(ovs_key)) != nla_len(a)) |
| return -EINVAL; |
| |
| if (key_type > OVS_KEY_ATTR_MAX || |
| nla_len(ovs_key) != ovs_key_lens[key_type]) |
| return -EINVAL; |
| |
| switch (key_type) { |
| const struct ovs_key_ipv4 *ipv4_key; |
| |
| case OVS_KEY_ATTR_PRIORITY: |
| case OVS_KEY_ATTR_ETHERNET: |
| break; |
| |
| case OVS_KEY_ATTR_IPV4: |
| if (flow_key->eth.type != htons(ETH_P_IP)) |
| return -EINVAL; |
| |
| if (!flow_key->ipv4.addr.src || !flow_key->ipv4.addr.dst) |
| return -EINVAL; |
| |
| ipv4_key = nla_data(ovs_key); |
| if (ipv4_key->ipv4_proto != flow_key->ip.proto) |
| return -EINVAL; |
| |
| if (ipv4_key->ipv4_frag != flow_key->ip.frag) |
| return -EINVAL; |
| |
| break; |
| |
| case OVS_KEY_ATTR_TCP: |
| if (flow_key->ip.proto != IPPROTO_TCP) |
| return -EINVAL; |
| |
| if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) |
| return -EINVAL; |
| |
| break; |
| |
| case OVS_KEY_ATTR_UDP: |
| if (flow_key->ip.proto != IPPROTO_UDP) |
| return -EINVAL; |
| |
| if (!flow_key->ipv4.tp.src || !flow_key->ipv4.tp.dst) |
| return -EINVAL; |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| |
| return 0; |
| } |
| |
| static int validate_userspace(const struct nlattr *attr) |
| { |
| static const struct nla_policy userspace_policy[OVS_USERSPACE_ATTR_MAX + 1] = { |
| [OVS_USERSPACE_ATTR_PID] = {.type = NLA_U32 }, |
| [OVS_USERSPACE_ATTR_USERDATA] = {.type = NLA_U64 }, |
| }; |
| struct nlattr *a[OVS_USERSPACE_ATTR_MAX + 1]; |
| int error; |
| |
| error = nla_parse_nested(a, OVS_USERSPACE_ATTR_MAX, |
| attr, userspace_policy); |
| if (error) |
| return error; |
| |
| if (!a[OVS_USERSPACE_ATTR_PID] || |
| !nla_get_u32(a[OVS_USERSPACE_ATTR_PID])) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static int validate_actions(const struct nlattr *attr, |
| const struct sw_flow_key *key, int depth) |
| { |
| const struct nlattr *a; |
| int rem, err; |
| |
| if (depth >= SAMPLE_ACTION_DEPTH) |
| return -EOVERFLOW; |
| |
| nla_for_each_nested(a, attr, rem) { |
| /* Expected argument lengths, (u32)-1 for variable length. */ |
| static const u32 action_lens[OVS_ACTION_ATTR_MAX + 1] = { |
| [OVS_ACTION_ATTR_OUTPUT] = sizeof(u32), |
| [OVS_ACTION_ATTR_USERSPACE] = (u32)-1, |
| [OVS_ACTION_ATTR_PUSH_VLAN] = sizeof(struct ovs_action_push_vlan), |
| [OVS_ACTION_ATTR_POP_VLAN] = 0, |
| [OVS_ACTION_ATTR_SET] = (u32)-1, |
| [OVS_ACTION_ATTR_SAMPLE] = (u32)-1 |
| }; |
| const struct ovs_action_push_vlan *vlan; |
| int type = nla_type(a); |
| |
| if (type > OVS_ACTION_ATTR_MAX || |
| (action_lens[type] != nla_len(a) && |
| action_lens[type] != (u32)-1)) |
| return -EINVAL; |
| |
| switch (type) { |
| case OVS_ACTION_ATTR_UNSPEC: |
| return -EINVAL; |
| |
| case OVS_ACTION_ATTR_USERSPACE: |
| err = validate_userspace(a); |
| if (err) |
| return err; |
| break; |
| |
| case OVS_ACTION_ATTR_OUTPUT: |
| if (nla_get_u32(a) >= DP_MAX_PORTS) |
| return -EINVAL; |
| break; |
| |
| |
| case OVS_ACTION_ATTR_POP_VLAN: |
| break; |
| |
| case OVS_ACTION_ATTR_PUSH_VLAN: |
| vlan = nla_data(a); |
| if (vlan->vlan_tpid != htons(ETH_P_8021Q)) |
| return -EINVAL; |
| if (!(vlan->vlan_tci & htons(VLAN_TAG_PRESENT))) |
| return -EINVAL; |
| break; |
| |
| case OVS_ACTION_ATTR_SET: |
| err = validate_set(a, key); |
| if (err) |
| return err; |
| break; |
| |
| case OVS_ACTION_ATTR_SAMPLE: |
| err = validate_sample(a, key, depth); |
| if (err) |
| return err; |
| break; |
| |
| default: |
| return -EINVAL; |
| } |
| } |
| |
| if (rem > 0) |
| return -EINVAL; |
| |
| return 0; |
| } |
| |
| static void clear_stats(struct sw_flow *flow) |
| { |
| flow->used = 0; |
| flow->tcp_flags = 0; |
| flow->packet_count = 0; |
| flow->byte_count = 0; |
| } |
| |
| static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct ovs_header *ovs_header = info->userhdr; |
| struct nlattr **a = info->attrs; |
| struct sw_flow_actions *acts; |
| struct sk_buff *packet; |
| struct sw_flow *flow; |
| struct datapath *dp; |
| struct ethhdr *eth; |
| int len; |
| int err; |
| int key_len; |
| |
| err = -EINVAL; |
| if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || |
| !a[OVS_PACKET_ATTR_ACTIONS] || |
| nla_len(a[OVS_PACKET_ATTR_PACKET]) < ETH_HLEN) |
| goto err; |
| |
| len = nla_len(a[OVS_PACKET_ATTR_PACKET]); |
| packet = __dev_alloc_skb(NET_IP_ALIGN + len, GFP_KERNEL); |
| err = -ENOMEM; |
| if (!packet) |
| goto err; |
| skb_reserve(packet, NET_IP_ALIGN); |
| |
| memcpy(__skb_put(packet, len), nla_data(a[OVS_PACKET_ATTR_PACKET]), len); |
| |
| skb_reset_mac_header(packet); |
| eth = eth_hdr(packet); |
| |
| /* Normally, setting the skb 'protocol' field would be handled by a |
| * call to eth_type_trans(), but it assumes there's a sending |
| * device, which we may not have. */ |
| if (ntohs(eth->h_proto) >= 1536) |
| packet->protocol = eth->h_proto; |
| else |
| packet->protocol = htons(ETH_P_802_2); |
| |
| /* Build an sw_flow for sending this packet. */ |
| flow = ovs_flow_alloc(); |
| err = PTR_ERR(flow); |
| if (IS_ERR(flow)) |
| goto err_kfree_skb; |
| |
| err = ovs_flow_extract(packet, -1, &flow->key, &key_len); |
| if (err) |
| goto err_flow_free; |
| |
| err = ovs_flow_metadata_from_nlattrs(&flow->key.phy.priority, |
| &flow->key.phy.in_port, |
| a[OVS_PACKET_ATTR_KEY]); |
| if (err) |
| goto err_flow_free; |
| |
| err = validate_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0); |
| if (err) |
| goto err_flow_free; |
| |
| flow->hash = ovs_flow_hash(&flow->key, key_len); |
| |
| acts = ovs_flow_actions_alloc(a[OVS_PACKET_ATTR_ACTIONS]); |
| err = PTR_ERR(acts); |
| if (IS_ERR(acts)) |
| goto err_flow_free; |
| rcu_assign_pointer(flow->sf_acts, acts); |
| |
| OVS_CB(packet)->flow = flow; |
| packet->priority = flow->key.phy.priority; |
| |
| rcu_read_lock(); |
| dp = get_dp(ovs_header->dp_ifindex); |
| err = -ENODEV; |
| if (!dp) |
| goto err_unlock; |
| |
| local_bh_disable(); |
| err = ovs_execute_actions(dp, packet); |
| local_bh_enable(); |
| rcu_read_unlock(); |
| |
| ovs_flow_free(flow); |
| return err; |
| |
| err_unlock: |
| rcu_read_unlock(); |
| err_flow_free: |
| ovs_flow_free(flow); |
| err_kfree_skb: |
| kfree_skb(packet); |
| err: |
| return err; |
| } |
| |
| static const struct nla_policy packet_policy[OVS_PACKET_ATTR_MAX + 1] = { |
| [OVS_PACKET_ATTR_PACKET] = { .type = NLA_UNSPEC }, |
| [OVS_PACKET_ATTR_KEY] = { .type = NLA_NESTED }, |
| [OVS_PACKET_ATTR_ACTIONS] = { .type = NLA_NESTED }, |
| }; |
| |
| static struct genl_ops dp_packet_genl_ops[] = { |
| { .cmd = OVS_PACKET_CMD_EXECUTE, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = packet_policy, |
| .doit = ovs_packet_cmd_execute |
| } |
| }; |
| |
| static void get_dp_stats(struct datapath *dp, struct ovs_dp_stats *stats) |
| { |
| int i; |
| struct flow_table *table = genl_dereference(dp->table); |
| |
| stats->n_flows = ovs_flow_tbl_count(table); |
| |
| stats->n_hit = stats->n_missed = stats->n_lost = 0; |
| for_each_possible_cpu(i) { |
| const struct dp_stats_percpu *percpu_stats; |
| struct dp_stats_percpu local_stats; |
| unsigned int start; |
| |
| percpu_stats = per_cpu_ptr(dp->stats_percpu, i); |
| |
| do { |
| start = u64_stats_fetch_begin_bh(&percpu_stats->sync); |
| local_stats = *percpu_stats; |
| } while (u64_stats_fetch_retry_bh(&percpu_stats->sync, start)); |
| |
| stats->n_hit += local_stats.n_hit; |
| stats->n_missed += local_stats.n_missed; |
| stats->n_lost += local_stats.n_lost; |
| } |
| } |
| |
| static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { |
| [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, |
| [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, |
| [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, |
| }; |
| |
| static struct genl_family dp_flow_genl_family = { |
| .id = GENL_ID_GENERATE, |
| .hdrsize = sizeof(struct ovs_header), |
| .name = OVS_FLOW_FAMILY, |
| .version = OVS_FLOW_VERSION, |
| .maxattr = OVS_FLOW_ATTR_MAX |
| }; |
| |
| static struct genl_multicast_group ovs_dp_flow_multicast_group = { |
| .name = OVS_FLOW_MCGROUP |
| }; |
| |
| /* Called with genl_lock. */ |
| static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, |
| struct sk_buff *skb, u32 pid, |
| u32 seq, u32 flags, u8 cmd) |
| { |
| const int skb_orig_len = skb->len; |
| const struct sw_flow_actions *sf_acts; |
| struct ovs_flow_stats stats; |
| struct ovs_header *ovs_header; |
| struct nlattr *nla; |
| unsigned long used; |
| u8 tcp_flags; |
| int err; |
| |
| sf_acts = rcu_dereference_protected(flow->sf_acts, |
| lockdep_genl_is_held()); |
| |
| ovs_header = genlmsg_put(skb, pid, seq, &dp_flow_genl_family, flags, cmd); |
| if (!ovs_header) |
| return -EMSGSIZE; |
| |
| ovs_header->dp_ifindex = get_dpifindex(dp); |
| |
| nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); |
| if (!nla) |
| goto nla_put_failure; |
| err = ovs_flow_to_nlattrs(&flow->key, skb); |
| if (err) |
| goto error; |
| nla_nest_end(skb, nla); |
| |
| spin_lock_bh(&flow->lock); |
| used = flow->used; |
| stats.n_packets = flow->packet_count; |
| stats.n_bytes = flow->byte_count; |
| tcp_flags = flow->tcp_flags; |
| spin_unlock_bh(&flow->lock); |
| |
| if (used) |
| NLA_PUT_U64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used)); |
| |
| if (stats.n_packets) |
| NLA_PUT(skb, OVS_FLOW_ATTR_STATS, |
| sizeof(struct ovs_flow_stats), &stats); |
| |
| if (tcp_flags) |
| NLA_PUT_U8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags); |
| |
| /* If OVS_FLOW_ATTR_ACTIONS doesn't fit, skip dumping the actions if |
| * this is the first flow to be dumped into 'skb'. This is unusual for |
| * Netlink but individual action lists can be longer than |
| * NLMSG_GOODSIZE and thus entirely undumpable if we didn't do this. |
| * The userspace caller can always fetch the actions separately if it |
| * really wants them. (Most userspace callers in fact don't care.) |
| * |
| * This can only fail for dump operations because the skb is always |
| * properly sized for single flows. |
| */ |
| err = nla_put(skb, OVS_FLOW_ATTR_ACTIONS, sf_acts->actions_len, |
| sf_acts->actions); |
| if (err < 0 && skb_orig_len) |
| goto error; |
| |
| return genlmsg_end(skb, ovs_header); |
| |
| nla_put_failure: |
| err = -EMSGSIZE; |
| error: |
| genlmsg_cancel(skb, ovs_header); |
| return err; |
| } |
| |
| static struct sk_buff *ovs_flow_cmd_alloc_info(struct sw_flow *flow) |
| { |
| const struct sw_flow_actions *sf_acts; |
| int len; |
| |
| sf_acts = rcu_dereference_protected(flow->sf_acts, |
| lockdep_genl_is_held()); |
| |
| /* OVS_FLOW_ATTR_KEY */ |
| len = nla_total_size(FLOW_BUFSIZE); |
| /* OVS_FLOW_ATTR_ACTIONS */ |
| len += nla_total_size(sf_acts->actions_len); |
| /* OVS_FLOW_ATTR_STATS */ |
| len += nla_total_size(sizeof(struct ovs_flow_stats)); |
| /* OVS_FLOW_ATTR_TCP_FLAGS */ |
| len += nla_total_size(1); |
| /* OVS_FLOW_ATTR_USED */ |
| len += nla_total_size(8); |
| |
| len += NLMSG_ALIGN(sizeof(struct ovs_header)); |
| |
| return genlmsg_new(len, GFP_KERNEL); |
| } |
| |
| static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, |
| struct datapath *dp, |
| u32 pid, u32 seq, u8 cmd) |
| { |
| struct sk_buff *skb; |
| int retval; |
| |
| skb = ovs_flow_cmd_alloc_info(flow); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| retval = ovs_flow_cmd_fill_info(flow, dp, skb, pid, seq, 0, cmd); |
| BUG_ON(retval < 0); |
| return skb; |
| } |
| |
| static int ovs_flow_cmd_new_or_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sw_flow_key key; |
| struct sw_flow *flow; |
| struct sk_buff *reply; |
| struct datapath *dp; |
| struct flow_table *table; |
| int error; |
| int key_len; |
| |
| /* Extract key. */ |
| error = -EINVAL; |
| if (!a[OVS_FLOW_ATTR_KEY]) |
| goto error; |
| error = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); |
| if (error) |
| goto error; |
| |
| /* Validate actions. */ |
| if (a[OVS_FLOW_ATTR_ACTIONS]) { |
| error = validate_actions(a[OVS_FLOW_ATTR_ACTIONS], &key, 0); |
| if (error) |
| goto error; |
| } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { |
| error = -EINVAL; |
| goto error; |
| } |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| error = -ENODEV; |
| if (!dp) |
| goto error; |
| |
| table = genl_dereference(dp->table); |
| flow = ovs_flow_tbl_lookup(table, &key, key_len); |
| if (!flow) { |
| struct sw_flow_actions *acts; |
| |
| /* Bail out if we're not allowed to create a new flow. */ |
| error = -ENOENT; |
| if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) |
| goto error; |
| |
| /* Expand table, if necessary, to make room. */ |
| if (ovs_flow_tbl_need_to_expand(table)) { |
| struct flow_table *new_table; |
| |
| new_table = ovs_flow_tbl_expand(table); |
| if (!IS_ERR(new_table)) { |
| rcu_assign_pointer(dp->table, new_table); |
| ovs_flow_tbl_deferred_destroy(table); |
| table = genl_dereference(dp->table); |
| } |
| } |
| |
| /* Allocate flow. */ |
| flow = ovs_flow_alloc(); |
| if (IS_ERR(flow)) { |
| error = PTR_ERR(flow); |
| goto error; |
| } |
| flow->key = key; |
| clear_stats(flow); |
| |
| /* Obtain actions. */ |
| acts = ovs_flow_actions_alloc(a[OVS_FLOW_ATTR_ACTIONS]); |
| error = PTR_ERR(acts); |
| if (IS_ERR(acts)) |
| goto error_free_flow; |
| rcu_assign_pointer(flow->sf_acts, acts); |
| |
| /* Put flow in bucket. */ |
| flow->hash = ovs_flow_hash(&key, key_len); |
| ovs_flow_tbl_insert(table, flow); |
| |
| reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, |
| info->snd_seq, |
| OVS_FLOW_CMD_NEW); |
| } else { |
| /* We found a matching flow. */ |
| struct sw_flow_actions *old_acts; |
| struct nlattr *acts_attrs; |
| |
| /* Bail out if we're not allowed to modify an existing flow. |
| * We accept NLM_F_CREATE in place of the intended NLM_F_EXCL |
| * because Generic Netlink treats the latter as a dump |
| * request. We also accept NLM_F_EXCL in case that bug ever |
| * gets fixed. |
| */ |
| error = -EEXIST; |
| if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW && |
| info->nlhdr->nlmsg_flags & (NLM_F_CREATE | NLM_F_EXCL)) |
| goto error; |
| |
| /* Update actions. */ |
| old_acts = rcu_dereference_protected(flow->sf_acts, |
| lockdep_genl_is_held()); |
| acts_attrs = a[OVS_FLOW_ATTR_ACTIONS]; |
| if (acts_attrs && |
| (old_acts->actions_len != nla_len(acts_attrs) || |
| memcmp(old_acts->actions, nla_data(acts_attrs), |
| old_acts->actions_len))) { |
| struct sw_flow_actions *new_acts; |
| |
| new_acts = ovs_flow_actions_alloc(acts_attrs); |
| error = PTR_ERR(new_acts); |
| if (IS_ERR(new_acts)) |
| goto error; |
| |
| rcu_assign_pointer(flow->sf_acts, new_acts); |
| ovs_flow_deferred_free_acts(old_acts); |
| } |
| |
| reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, |
| info->snd_seq, OVS_FLOW_CMD_NEW); |
| |
| /* Clear stats. */ |
| if (a[OVS_FLOW_ATTR_CLEAR]) { |
| spin_lock_bh(&flow->lock); |
| clear_stats(flow); |
| spin_unlock_bh(&flow->lock); |
| } |
| } |
| |
| if (!IS_ERR(reply)) |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_flow_multicast_group.id, info->nlhdr, |
| GFP_KERNEL); |
| else |
| netlink_set_err(init_net.genl_sock, 0, |
| ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); |
| return 0; |
| |
| error_free_flow: |
| ovs_flow_free(flow); |
| error: |
| return error; |
| } |
| |
| static int ovs_flow_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sw_flow_key key; |
| struct sk_buff *reply; |
| struct sw_flow *flow; |
| struct datapath *dp; |
| struct flow_table *table; |
| int err; |
| int key_len; |
| |
| if (!a[OVS_FLOW_ATTR_KEY]) |
| return -EINVAL; |
| err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); |
| if (err) |
| return err; |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| if (!dp) |
| return -ENODEV; |
| |
| table = genl_dereference(dp->table); |
| flow = ovs_flow_tbl_lookup(table, &key, key_len); |
| if (!flow) |
| return -ENOENT; |
| |
| reply = ovs_flow_cmd_build_info(flow, dp, info->snd_pid, |
| info->snd_seq, OVS_FLOW_CMD_NEW); |
| if (IS_ERR(reply)) |
| return PTR_ERR(reply); |
| |
| return genlmsg_reply(reply, info); |
| } |
| |
| static int ovs_flow_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sw_flow_key key; |
| struct sk_buff *reply; |
| struct sw_flow *flow; |
| struct datapath *dp; |
| struct flow_table *table; |
| int err; |
| int key_len; |
| |
| if (!a[OVS_FLOW_ATTR_KEY]) |
| return flush_flows(ovs_header->dp_ifindex); |
| err = ovs_flow_from_nlattrs(&key, &key_len, a[OVS_FLOW_ATTR_KEY]); |
| if (err) |
| return err; |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| if (!dp) |
| return -ENODEV; |
| |
| table = genl_dereference(dp->table); |
| flow = ovs_flow_tbl_lookup(table, &key, key_len); |
| if (!flow) |
| return -ENOENT; |
| |
| reply = ovs_flow_cmd_alloc_info(flow); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_flow_tbl_remove(table, flow); |
| |
| err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_pid, |
| info->snd_seq, 0, OVS_FLOW_CMD_DEL); |
| BUG_ON(err < 0); |
| |
| ovs_flow_deferred_free(flow); |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_flow_multicast_group.id, info->nlhdr, GFP_KERNEL); |
| return 0; |
| } |
| |
| static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); |
| struct datapath *dp; |
| struct flow_table *table; |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| if (!dp) |
| return -ENODEV; |
| |
| table = genl_dereference(dp->table); |
| |
| for (;;) { |
| struct sw_flow *flow; |
| u32 bucket, obj; |
| |
| bucket = cb->args[0]; |
| obj = cb->args[1]; |
| flow = ovs_flow_tbl_next(table, &bucket, &obj); |
| if (!flow) |
| break; |
| |
| if (ovs_flow_cmd_fill_info(flow, dp, skb, |
| NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| OVS_FLOW_CMD_NEW) < 0) |
| break; |
| |
| cb->args[0] = bucket; |
| cb->args[1] = obj; |
| } |
| return skb->len; |
| } |
| |
| static struct genl_ops dp_flow_genl_ops[] = { |
| { .cmd = OVS_FLOW_CMD_NEW, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = flow_policy, |
| .doit = ovs_flow_cmd_new_or_set |
| }, |
| { .cmd = OVS_FLOW_CMD_DEL, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = flow_policy, |
| .doit = ovs_flow_cmd_del |
| }, |
| { .cmd = OVS_FLOW_CMD_GET, |
| .flags = 0, /* OK for unprivileged users. */ |
| .policy = flow_policy, |
| .doit = ovs_flow_cmd_get, |
| .dumpit = ovs_flow_cmd_dump |
| }, |
| { .cmd = OVS_FLOW_CMD_SET, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = flow_policy, |
| .doit = ovs_flow_cmd_new_or_set, |
| }, |
| }; |
| |
| static const struct nla_policy datapath_policy[OVS_DP_ATTR_MAX + 1] = { |
| [OVS_DP_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, |
| [OVS_DP_ATTR_UPCALL_PID] = { .type = NLA_U32 }, |
| }; |
| |
| static struct genl_family dp_datapath_genl_family = { |
| .id = GENL_ID_GENERATE, |
| .hdrsize = sizeof(struct ovs_header), |
| .name = OVS_DATAPATH_FAMILY, |
| .version = OVS_DATAPATH_VERSION, |
| .maxattr = OVS_DP_ATTR_MAX |
| }; |
| |
| static struct genl_multicast_group ovs_dp_datapath_multicast_group = { |
| .name = OVS_DATAPATH_MCGROUP |
| }; |
| |
| static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, |
| u32 pid, u32 seq, u32 flags, u8 cmd) |
| { |
| struct ovs_header *ovs_header; |
| struct ovs_dp_stats dp_stats; |
| int err; |
| |
| ovs_header = genlmsg_put(skb, pid, seq, &dp_datapath_genl_family, |
| flags, cmd); |
| if (!ovs_header) |
| goto error; |
| |
| ovs_header->dp_ifindex = get_dpifindex(dp); |
| |
| rcu_read_lock(); |
| err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); |
| rcu_read_unlock(); |
| if (err) |
| goto nla_put_failure; |
| |
| get_dp_stats(dp, &dp_stats); |
| NLA_PUT(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats); |
| |
| return genlmsg_end(skb, ovs_header); |
| |
| nla_put_failure: |
| genlmsg_cancel(skb, ovs_header); |
| error: |
| return -EMSGSIZE; |
| } |
| |
| static struct sk_buff *ovs_dp_cmd_build_info(struct datapath *dp, u32 pid, |
| u32 seq, u8 cmd) |
| { |
| struct sk_buff *skb; |
| int retval; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| retval = ovs_dp_cmd_fill_info(dp, skb, pid, seq, 0, cmd); |
| if (retval < 0) { |
| kfree_skb(skb); |
| return ERR_PTR(retval); |
| } |
| return skb; |
| } |
| |
| /* Called with genl_mutex and optionally with RTNL lock also. */ |
| static struct datapath *lookup_datapath(struct ovs_header *ovs_header, |
| struct nlattr *a[OVS_DP_ATTR_MAX + 1]) |
| { |
| struct datapath *dp; |
| |
| if (!a[OVS_DP_ATTR_NAME]) |
| dp = get_dp(ovs_header->dp_ifindex); |
| else { |
| struct vport *vport; |
| |
| rcu_read_lock(); |
| vport = ovs_vport_locate(nla_data(a[OVS_DP_ATTR_NAME])); |
| dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; |
| rcu_read_unlock(); |
| } |
| return dp ? dp : ERR_PTR(-ENODEV); |
| } |
| |
| static int ovs_dp_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct vport_parms parms; |
| struct sk_buff *reply; |
| struct datapath *dp; |
| struct vport *vport; |
| int err; |
| |
| err = -EINVAL; |
| if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) |
| goto err; |
| |
| rtnl_lock(); |
| err = -ENODEV; |
| if (!try_module_get(THIS_MODULE)) |
| goto err_unlock_rtnl; |
| |
| err = -ENOMEM; |
| dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
| if (dp == NULL) |
| goto err_put_module; |
| INIT_LIST_HEAD(&dp->port_list); |
| |
| /* Allocate table. */ |
| err = -ENOMEM; |
| rcu_assign_pointer(dp->table, ovs_flow_tbl_alloc(TBL_MIN_BUCKETS)); |
| if (!dp->table) |
| goto err_free_dp; |
| |
| dp->stats_percpu = alloc_percpu(struct dp_stats_percpu); |
| if (!dp->stats_percpu) { |
| err = -ENOMEM; |
| goto err_destroy_table; |
| } |
| |
| /* Set up our datapath device. */ |
| parms.name = nla_data(a[OVS_DP_ATTR_NAME]); |
| parms.type = OVS_VPORT_TYPE_INTERNAL; |
| parms.options = NULL; |
| parms.dp = dp; |
| parms.port_no = OVSP_LOCAL; |
| parms.upcall_pid = nla_get_u32(a[OVS_DP_ATTR_UPCALL_PID]); |
| |
| vport = new_vport(&parms); |
| if (IS_ERR(vport)) { |
| err = PTR_ERR(vport); |
| if (err == -EBUSY) |
| err = -EEXIST; |
| |
| goto err_destroy_percpu; |
| } |
| |
| reply = ovs_dp_cmd_build_info(dp, info->snd_pid, |
| info->snd_seq, OVS_DP_CMD_NEW); |
| err = PTR_ERR(reply); |
| if (IS_ERR(reply)) |
| goto err_destroy_local_port; |
| |
| list_add_tail(&dp->list_node, &dps); |
| rtnl_unlock(); |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_datapath_multicast_group.id, info->nlhdr, |
| GFP_KERNEL); |
| return 0; |
| |
| err_destroy_local_port: |
| ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); |
| err_destroy_percpu: |
| free_percpu(dp->stats_percpu); |
| err_destroy_table: |
| ovs_flow_tbl_destroy(genl_dereference(dp->table)); |
| err_free_dp: |
| kfree(dp); |
| err_put_module: |
| module_put(THIS_MODULE); |
| err_unlock_rtnl: |
| rtnl_unlock(); |
| err: |
| return err; |
| } |
| |
| static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct vport *vport, *next_vport; |
| struct sk_buff *reply; |
| struct datapath *dp; |
| int err; |
| |
| rtnl_lock(); |
| dp = lookup_datapath(info->userhdr, info->attrs); |
| err = PTR_ERR(dp); |
| if (IS_ERR(dp)) |
| goto exit_unlock; |
| |
| reply = ovs_dp_cmd_build_info(dp, info->snd_pid, |
| info->snd_seq, OVS_DP_CMD_DEL); |
| err = PTR_ERR(reply); |
| if (IS_ERR(reply)) |
| goto exit_unlock; |
| |
| list_for_each_entry_safe(vport, next_vport, &dp->port_list, node) |
| if (vport->port_no != OVSP_LOCAL) |
| ovs_dp_detach_port(vport); |
| |
| list_del(&dp->list_node); |
| ovs_dp_detach_port(rtnl_dereference(dp->ports[OVSP_LOCAL])); |
| |
| /* rtnl_unlock() will wait until all the references to devices that |
| * are pending unregistration have been dropped. We do it here to |
| * ensure that any internal devices (which contain DP pointers) are |
| * fully destroyed before freeing the datapath. |
| */ |
| rtnl_unlock(); |
| |
| call_rcu(&dp->rcu, destroy_dp_rcu); |
| module_put(THIS_MODULE); |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_datapath_multicast_group.id, info->nlhdr, |
| GFP_KERNEL); |
| |
| return 0; |
| |
| exit_unlock: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int ovs_dp_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct sk_buff *reply; |
| struct datapath *dp; |
| int err; |
| |
| dp = lookup_datapath(info->userhdr, info->attrs); |
| if (IS_ERR(dp)) |
| return PTR_ERR(dp); |
| |
| reply = ovs_dp_cmd_build_info(dp, info->snd_pid, |
| info->snd_seq, OVS_DP_CMD_NEW); |
| if (IS_ERR(reply)) { |
| err = PTR_ERR(reply); |
| netlink_set_err(init_net.genl_sock, 0, |
| ovs_dp_datapath_multicast_group.id, err); |
| return 0; |
| } |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_datapath_multicast_group.id, info->nlhdr, |
| GFP_KERNEL); |
| |
| return 0; |
| } |
| |
| static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct sk_buff *reply; |
| struct datapath *dp; |
| |
| dp = lookup_datapath(info->userhdr, info->attrs); |
| if (IS_ERR(dp)) |
| return PTR_ERR(dp); |
| |
| reply = ovs_dp_cmd_build_info(dp, info->snd_pid, |
| info->snd_seq, OVS_DP_CMD_NEW); |
| if (IS_ERR(reply)) |
| return PTR_ERR(reply); |
| |
| return genlmsg_reply(reply, info); |
| } |
| |
| static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct datapath *dp; |
| int skip = cb->args[0]; |
| int i = 0; |
| |
| list_for_each_entry(dp, &dps, list_node) { |
| if (i >= skip && |
| ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| OVS_DP_CMD_NEW) < 0) |
| break; |
| i++; |
| } |
| |
| cb->args[0] = i; |
| |
| return skb->len; |
| } |
| |
| static struct genl_ops dp_datapath_genl_ops[] = { |
| { .cmd = OVS_DP_CMD_NEW, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = datapath_policy, |
| .doit = ovs_dp_cmd_new |
| }, |
| { .cmd = OVS_DP_CMD_DEL, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = datapath_policy, |
| .doit = ovs_dp_cmd_del |
| }, |
| { .cmd = OVS_DP_CMD_GET, |
| .flags = 0, /* OK for unprivileged users. */ |
| .policy = datapath_policy, |
| .doit = ovs_dp_cmd_get, |
| .dumpit = ovs_dp_cmd_dump |
| }, |
| { .cmd = OVS_DP_CMD_SET, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = datapath_policy, |
| .doit = ovs_dp_cmd_set, |
| }, |
| }; |
| |
| static const struct nla_policy vport_policy[OVS_VPORT_ATTR_MAX + 1] = { |
| [OVS_VPORT_ATTR_NAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ - 1 }, |
| [OVS_VPORT_ATTR_STATS] = { .len = sizeof(struct ovs_vport_stats) }, |
| [OVS_VPORT_ATTR_PORT_NO] = { .type = NLA_U32 }, |
| [OVS_VPORT_ATTR_TYPE] = { .type = NLA_U32 }, |
| [OVS_VPORT_ATTR_UPCALL_PID] = { .type = NLA_U32 }, |
| [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, |
| }; |
| |
| static struct genl_family dp_vport_genl_family = { |
| .id = GENL_ID_GENERATE, |
| .hdrsize = sizeof(struct ovs_header), |
| .name = OVS_VPORT_FAMILY, |
| .version = OVS_VPORT_VERSION, |
| .maxattr = OVS_VPORT_ATTR_MAX |
| }; |
| |
| struct genl_multicast_group ovs_dp_vport_multicast_group = { |
| .name = OVS_VPORT_MCGROUP |
| }; |
| |
| /* Called with RTNL lock or RCU read lock. */ |
| static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, |
| u32 pid, u32 seq, u32 flags, u8 cmd) |
| { |
| struct ovs_header *ovs_header; |
| struct ovs_vport_stats vport_stats; |
| int err; |
| |
| ovs_header = genlmsg_put(skb, pid, seq, &dp_vport_genl_family, |
| flags, cmd); |
| if (!ovs_header) |
| return -EMSGSIZE; |
| |
| ovs_header->dp_ifindex = get_dpifindex(vport->dp); |
| |
| NLA_PUT_U32(skb, OVS_VPORT_ATTR_PORT_NO, vport->port_no); |
| NLA_PUT_U32(skb, OVS_VPORT_ATTR_TYPE, vport->ops->type); |
| NLA_PUT_STRING(skb, OVS_VPORT_ATTR_NAME, vport->ops->get_name(vport)); |
| NLA_PUT_U32(skb, OVS_VPORT_ATTR_UPCALL_PID, vport->upcall_pid); |
| |
| ovs_vport_get_stats(vport, &vport_stats); |
| NLA_PUT(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), |
| &vport_stats); |
| |
| err = ovs_vport_get_options(vport, skb); |
| if (err == -EMSGSIZE) |
| goto error; |
| |
| return genlmsg_end(skb, ovs_header); |
| |
| nla_put_failure: |
| err = -EMSGSIZE; |
| error: |
| genlmsg_cancel(skb, ovs_header); |
| return err; |
| } |
| |
| /* Called with RTNL lock or RCU read lock. */ |
| struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 pid, |
| u32 seq, u8 cmd) |
| { |
| struct sk_buff *skb; |
| int retval; |
| |
| skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| retval = ovs_vport_cmd_fill_info(vport, skb, pid, seq, 0, cmd); |
| if (retval < 0) { |
| kfree_skb(skb); |
| return ERR_PTR(retval); |
| } |
| return skb; |
| } |
| |
| /* Called with RTNL lock or RCU read lock. */ |
| static struct vport *lookup_vport(struct ovs_header *ovs_header, |
| struct nlattr *a[OVS_VPORT_ATTR_MAX + 1]) |
| { |
| struct datapath *dp; |
| struct vport *vport; |
| |
| if (a[OVS_VPORT_ATTR_NAME]) { |
| vport = ovs_vport_locate(nla_data(a[OVS_VPORT_ATTR_NAME])); |
| if (!vport) |
| return ERR_PTR(-ENODEV); |
| if (ovs_header->dp_ifindex && |
| ovs_header->dp_ifindex != get_dpifindex(vport->dp)) |
| return ERR_PTR(-ENODEV); |
| return vport; |
| } else if (a[OVS_VPORT_ATTR_PORT_NO]) { |
| u32 port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); |
| |
| if (port_no >= DP_MAX_PORTS) |
| return ERR_PTR(-EFBIG); |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| if (!dp) |
| return ERR_PTR(-ENODEV); |
| |
| vport = rcu_dereference_rtnl(dp->ports[port_no]); |
| if (!vport) |
| return ERR_PTR(-ENOENT); |
| return vport; |
| } else |
| return ERR_PTR(-EINVAL); |
| } |
| |
| static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct vport_parms parms; |
| struct sk_buff *reply; |
| struct vport *vport; |
| struct datapath *dp; |
| u32 port_no; |
| int err; |
| |
| err = -EINVAL; |
| if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || |
| !a[OVS_VPORT_ATTR_UPCALL_PID]) |
| goto exit; |
| |
| rtnl_lock(); |
| dp = get_dp(ovs_header->dp_ifindex); |
| err = -ENODEV; |
| if (!dp) |
| goto exit_unlock; |
| |
| if (a[OVS_VPORT_ATTR_PORT_NO]) { |
| port_no = nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]); |
| |
| err = -EFBIG; |
| if (port_no >= DP_MAX_PORTS) |
| goto exit_unlock; |
| |
| vport = rtnl_dereference(dp->ports[port_no]); |
| err = -EBUSY; |
| if (vport) |
| goto exit_unlock; |
| } else { |
| for (port_no = 1; ; port_no++) { |
| if (port_no >= DP_MAX_PORTS) { |
| err = -EFBIG; |
| goto exit_unlock; |
| } |
| vport = rtnl_dereference(dp->ports[port_no]); |
| if (!vport) |
| break; |
| } |
| } |
| |
| parms.name = nla_data(a[OVS_VPORT_ATTR_NAME]); |
| parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); |
| parms.options = a[OVS_VPORT_ATTR_OPTIONS]; |
| parms.dp = dp; |
| parms.port_no = port_no; |
| parms.upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); |
| |
| vport = new_vport(&parms); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock; |
| |
| reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, |
| OVS_VPORT_CMD_NEW); |
| if (IS_ERR(reply)) { |
| err = PTR_ERR(reply); |
| ovs_dp_detach_port(vport); |
| goto exit_unlock; |
| } |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
| |
| exit_unlock: |
| rtnl_unlock(); |
| exit: |
| return err; |
| } |
| |
| static int ovs_vport_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct sk_buff *reply; |
| struct vport *vport; |
| int err; |
| |
| rtnl_lock(); |
| vport = lookup_vport(info->userhdr, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock; |
| |
| err = 0; |
| if (a[OVS_VPORT_ATTR_TYPE] && |
| nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) |
| err = -EINVAL; |
| |
| if (!err && a[OVS_VPORT_ATTR_OPTIONS]) |
| err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); |
| if (err) |
| goto exit_unlock; |
| if (a[OVS_VPORT_ATTR_UPCALL_PID]) |
| vport->upcall_pid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); |
| |
| reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, |
| OVS_VPORT_CMD_NEW); |
| if (IS_ERR(reply)) { |
| err = PTR_ERR(reply); |
| netlink_set_err(init_net.genl_sock, 0, |
| ovs_dp_vport_multicast_group.id, err); |
| return 0; |
| } |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
| |
| exit_unlock: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int ovs_vport_cmd_del(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct sk_buff *reply; |
| struct vport *vport; |
| int err; |
| |
| rtnl_lock(); |
| vport = lookup_vport(info->userhdr, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock; |
| |
| if (vport->port_no == OVSP_LOCAL) { |
| err = -EINVAL; |
| goto exit_unlock; |
| } |
| |
| reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, |
| OVS_VPORT_CMD_DEL); |
| err = PTR_ERR(reply); |
| if (IS_ERR(reply)) |
| goto exit_unlock; |
| |
| ovs_dp_detach_port(vport); |
| |
| genl_notify(reply, genl_info_net(info), info->snd_pid, |
| ovs_dp_vport_multicast_group.id, info->nlhdr, GFP_KERNEL); |
| |
| exit_unlock: |
| rtnl_unlock(); |
| return err; |
| } |
| |
| static int ovs_vport_cmd_get(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sk_buff *reply; |
| struct vport *vport; |
| int err; |
| |
| rcu_read_lock(); |
| vport = lookup_vport(ovs_header, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock; |
| |
| reply = ovs_vport_cmd_build_info(vport, info->snd_pid, info->snd_seq, |
| OVS_VPORT_CMD_NEW); |
| err = PTR_ERR(reply); |
| if (IS_ERR(reply)) |
| goto exit_unlock; |
| |
| rcu_read_unlock(); |
| |
| return genlmsg_reply(reply, info); |
| |
| exit_unlock: |
| rcu_read_unlock(); |
| return err; |
| } |
| |
| static int ovs_vport_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); |
| struct datapath *dp; |
| u32 port_no; |
| int retval; |
| |
| dp = get_dp(ovs_header->dp_ifindex); |
| if (!dp) |
| return -ENODEV; |
| |
| rcu_read_lock(); |
| for (port_no = cb->args[0]; port_no < DP_MAX_PORTS; port_no++) { |
| struct vport *vport; |
| |
| vport = rcu_dereference(dp->ports[port_no]); |
| if (!vport) |
| continue; |
| |
| if (ovs_vport_cmd_fill_info(vport, skb, NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| OVS_VPORT_CMD_NEW) < 0) |
| break; |
| } |
| rcu_read_unlock(); |
| |
| cb->args[0] = port_no; |
| retval = skb->len; |
| |
| return retval; |
| } |
| |
| static void rehash_flow_table(struct work_struct *work) |
| { |
| struct datapath *dp; |
| |
| genl_lock(); |
| |
| list_for_each_entry(dp, &dps, list_node) { |
| struct flow_table *old_table = genl_dereference(dp->table); |
| struct flow_table *new_table; |
| |
| new_table = ovs_flow_tbl_rehash(old_table); |
| if (!IS_ERR(new_table)) { |
| rcu_assign_pointer(dp->table, new_table); |
| ovs_flow_tbl_deferred_destroy(old_table); |
| } |
| } |
| |
| genl_unlock(); |
| |
| schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); |
| } |
| |
| static struct genl_ops dp_vport_genl_ops[] = { |
| { .cmd = OVS_VPORT_CMD_NEW, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = vport_policy, |
| .doit = ovs_vport_cmd_new |
| }, |
| { .cmd = OVS_VPORT_CMD_DEL, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = vport_policy, |
| .doit = ovs_vport_cmd_del |
| }, |
| { .cmd = OVS_VPORT_CMD_GET, |
| .flags = 0, /* OK for unprivileged users. */ |
| .policy = vport_policy, |
| .doit = ovs_vport_cmd_get, |
| .dumpit = ovs_vport_cmd_dump |
| }, |
| { .cmd = OVS_VPORT_CMD_SET, |
| .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ |
| .policy = vport_policy, |
| .doit = ovs_vport_cmd_set, |
| }, |
| }; |
| |
| struct genl_family_and_ops { |
| struct genl_family *family; |
| struct genl_ops *ops; |
| int n_ops; |
| struct genl_multicast_group *group; |
| }; |
| |
| static const struct genl_family_and_ops dp_genl_families[] = { |
| { &dp_datapath_genl_family, |
| dp_datapath_genl_ops, ARRAY_SIZE(dp_datapath_genl_ops), |
| &ovs_dp_datapath_multicast_group }, |
| { &dp_vport_genl_family, |
| dp_vport_genl_ops, ARRAY_SIZE(dp_vport_genl_ops), |
| &ovs_dp_vport_multicast_group }, |
| { &dp_flow_genl_family, |
| dp_flow_genl_ops, ARRAY_SIZE(dp_flow_genl_ops), |
| &ovs_dp_flow_multicast_group }, |
| { &dp_packet_genl_family, |
| dp_packet_genl_ops, ARRAY_SIZE(dp_packet_genl_ops), |
| NULL }, |
| }; |
| |
| static void dp_unregister_genl(int n_families) |
| { |
| int i; |
| |
| for (i = 0; i < n_families; i++) |
| genl_unregister_family(dp_genl_families[i].family); |
| } |
| |
| static int dp_register_genl(void) |
| { |
| int n_registered; |
| int err; |
| int i; |
| |
| n_registered = 0; |
| for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { |
| const struct genl_family_and_ops *f = &dp_genl_families[i]; |
| |
| err = genl_register_family_with_ops(f->family, f->ops, |
| f->n_ops); |
| if (err) |
| goto error; |
| n_registered++; |
| |
| if (f->group) { |
| err = genl_register_mc_group(f->family, f->group); |
| if (err) |
| goto error; |
| } |
| } |
| |
| return 0; |
| |
| error: |
| dp_unregister_genl(n_registered); |
| return err; |
| } |
| |
| static int __init dp_init(void) |
| { |
| struct sk_buff *dummy_skb; |
| int err; |
| |
| BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > sizeof(dummy_skb->cb)); |
| |
| pr_info("Open vSwitch switching datapath\n"); |
| |
| err = ovs_flow_init(); |
| if (err) |
| goto error; |
| |
| err = ovs_vport_init(); |
| if (err) |
| goto error_flow_exit; |
| |
| err = register_netdevice_notifier(&ovs_dp_device_notifier); |
| if (err) |
| goto error_vport_exit; |
| |
| err = dp_register_genl(); |
| if (err < 0) |
| goto error_unreg_notifier; |
| |
| schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); |
| |
| return 0; |
| |
| error_unreg_notifier: |
| unregister_netdevice_notifier(&ovs_dp_device_notifier); |
| error_vport_exit: |
| ovs_vport_exit(); |
| error_flow_exit: |
| ovs_flow_exit(); |
| error: |
| return err; |
| } |
| |
| static void dp_cleanup(void) |
| { |
| cancel_delayed_work_sync(&rehash_flow_wq); |
| rcu_barrier(); |
| dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); |
| unregister_netdevice_notifier(&ovs_dp_device_notifier); |
| ovs_vport_exit(); |
| ovs_flow_exit(); |
| } |
| |
| module_init(dp_init); |
| module_exit(dp_cleanup); |
| |
| MODULE_DESCRIPTION("Open vSwitch switching datapath"); |
| MODULE_LICENSE("GPL"); |