diff options
Diffstat (limited to 'net/openvswitch/datapath.c')
| -rw-r--r-- | net/openvswitch/datapath.c | 2453 |
1 files changed, 2453 insertions, 0 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c new file mode 100644 index 000000000000..2aa13bd7f2b2 --- /dev/null +++ b/net/openvswitch/datapath.c @@ -0,0 +1,2453 @@ +/* + * Copyright (c) 2007-2013 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/lockdep.h> +#include <linux/openvswitch.h> +#include <linux/rculist.h> +#include <linux/dmi.h> +#include <linux/workqueue.h> +#include <net/genetlink.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> + +#include "datapath.h" +#include "flow.h" +#include "vport-internal_dev.h" +#include "vport-netdev.h" + + +#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); + +int ovs_net_id __read_mostly; + +static void ovs_notify(struct sk_buff *skb, struct genl_info *info, + struct genl_multicast_group *grp) +{ + genl_notify(skb, genl_info_net(info), info->snd_portid, + grp->id, info->nlhdr, GFP_KERNEL); +} + +/** + * DOC: Locking: + * + * All writes e.g. Writes to device state (add/remove datapath, port, set + * operations on vports, etc.), Writes to other state (flow table + * modifications, set miscellaneous datapath parameters, etc.) are protected + * by ovs_lock. + * + * 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. + * + * The RTNL lock nests inside ovs_mutex. + */ + +static DEFINE_MUTEX(ovs_mutex); + +void ovs_lock(void) +{ + mutex_lock(&ovs_mutex); +} + +void ovs_unlock(void) +{ + mutex_unlock(&ovs_mutex); +} + +#ifdef CONFIG_LOCKDEP +int lockdep_ovsl_is_held(void) +{ + if (debug_locks) + return lockdep_is_held(&ovs_mutex); + else + return 1; +} +#endif + +static struct vport *new_vport(const struct vport_parms *); +static int queue_gso_packets(struct net *, int dp_ifindex, struct sk_buff *, + const struct dp_upcall_info *); +static int queue_userspace_packet(struct net *, int dp_ifindex, + struct sk_buff *, + const struct dp_upcall_info *); + +/* Must be called with rcu_read_lock or ovs_mutex. */ +static struct datapath *get_dp(struct net *net, int dp_ifindex) +{ + struct datapath *dp = NULL; + struct net_device *dev; + + rcu_read_lock(); + dev = dev_get_by_index_rcu(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 ovs_mutex. */ +const char *ovs_dp_name(const struct datapath *dp) +{ + struct vport *vport = ovs_vport_ovsl_rcu(dp, OVSP_LOCAL); + return vport->ops->get_name(vport); +} + +static int get_dpifindex(struct datapath *dp) +{ + struct vport *local; + int ifindex; + + rcu_read_lock(); + + local = ovs_vport_rcu(dp, OVSP_LOCAL); + if (local) + ifindex = netdev_vport_priv(local)->dev->ifindex; + 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, false); + free_percpu(dp->stats_percpu); + release_net(ovs_dp_get_net(dp)); + kfree(dp->ports); + kfree(dp); +} + +static struct hlist_head *vport_hash_bucket(const struct datapath *dp, + u16 port_no) +{ + return &dp->ports[port_no & (DP_VPORT_HASH_BUCKETS - 1)]; +} + +struct vport *ovs_lookup_vport(const struct datapath *dp, u16 port_no) +{ + struct vport *vport; + struct hlist_head *head; + + head = vport_hash_bucket(dp, port_no); + hlist_for_each_entry_rcu(vport, head, dp_hash_node) { + if (vport->port_no == port_no) + return vport; + } + return NULL; +} + +/* Called with ovs_mutex. */ +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; + struct hlist_head *head = vport_hash_bucket(dp, vport->port_no); + + hlist_add_head_rcu(&vport->dp_hash_node, head); + } + return vport; +} + +void ovs_dp_detach_port(struct vport *p) +{ + ASSERT_OVSL(); + + /* First drop references to device. */ + hlist_del_rcu(&p->dp_hash_node); + + /* 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; + + stats = this_cpu_ptr(dp->stats_percpu); + + /* Extract flow from 'skb' into 'key'. */ + error = ovs_flow_extract(skb, p->port_no, &key); + if (unlikely(error)) { + kfree_skb(skb); + return; + } + + /* Look up flow. */ + flow = ovs_flow_lookup(rcu_dereference(dp->table), &key); + if (unlikely(!flow)) { + struct dp_upcall_info upcall; + + upcall.cmd = OVS_PACKET_CMD_MISS; + upcall.key = &key; + upcall.userdata = NULL; + upcall.portid = p->upcall_portid; + ovs_dp_upcall(dp, skb, &upcall); + consume_skb(skb); + stats_counter = &stats->n_missed; + goto out; + } + + OVS_CB(skb)->flow = flow; + OVS_CB(skb)->pkt_key = &key; + + 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, + .netnsok = true, + .parallel_ops = true, +}; + +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->portid == 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(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); + else + err = queue_gso_packets(ovs_dp_get_net(dp), dp_ifindex, skb, upcall_info); + if (err) + goto err; + + return 0; + +err: + stats = this_cpu_ptr(dp->stats_percpu); + + u64_stats_update_begin(&stats->sync); + stats->n_lost++; + u64_stats_update_end(&stats->sync); + + return err; +} + +static int queue_gso_packets(struct net *net, int dp_ifindex, + struct sk_buff *skb, + const struct dp_upcall_info *upcall_info) +{ + unsigned short gso_type = skb_shinfo(skb)->gso_type; + 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, false); + if (IS_ERR(segs)) + return PTR_ERR(segs); + + /* Queue all of the segments. */ + skb = segs; + do { + err = queue_userspace_packet(net, dp_ifindex, skb, upcall_info); + if (err) + break; + + if (skb == segs && 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 size_t key_attr_size(void) +{ + return nla_total_size(4) /* OVS_KEY_ATTR_PRIORITY */ + + nla_total_size(0) /* OVS_KEY_ATTR_TUNNEL */ + + nla_total_size(8) /* OVS_TUNNEL_KEY_ATTR_ID */ + + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_SRC */ + + nla_total_size(4) /* OVS_TUNNEL_KEY_ATTR_IPV4_DST */ + + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TOS */ + + nla_total_size(1) /* OVS_TUNNEL_KEY_ATTR_TTL */ + + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_DONT_FRAGMENT */ + + nla_total_size(0) /* OVS_TUNNEL_KEY_ATTR_CSUM */ + + nla_total_size(4) /* OVS_KEY_ATTR_IN_PORT */ + + nla_total_size(4) /* OVS_KEY_ATTR_SKB_MARK */ + + nla_total_size(12) /* OVS_KEY_ATTR_ETHERNET */ + + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ + + nla_total_size(4) /* OVS_KEY_ATTR_8021Q */ + + nla_total_size(0) /* OVS_KEY_ATTR_ENCAP */ + + nla_total_size(2) /* OVS_KEY_ATTR_ETHERTYPE */ + + nla_total_size(40) /* OVS_KEY_ATTR_IPV6 */ + + nla_total_size(2) /* OVS_KEY_ATTR_ICMPV6 */ + + nla_total_size(28); /* OVS_KEY_ATTR_ND */ +} + +static size_t upcall_msg_size(const struct sk_buff *skb, + const struct nlattr *userdata) +{ + size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) + + nla_total_size(skb->len) /* OVS_PACKET_ATTR_PACKET */ + + nla_total_size(key_attr_size()); /* OVS_PACKET_ATTR_KEY */ + + /* OVS_PACKET_ATTR_USERDATA */ + if (userdata) + size += NLA_ALIGN(userdata->nla_len); + + return size; +} + +static int queue_userspace_packet(struct net *net, 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; + int err; + + if (vlan_tx_tag_present(skb)) { + nskb = skb_clone(skb, GFP_ATOMIC); + if (!nskb) + return -ENOMEM; + + nskb = __vlan_put_tag(nskb, nskb->vlan_proto, vlan_tx_tag_get(nskb)); + if (!nskb) + return -ENOMEM; + + nskb->vlan_tci = 0; + skb = nskb; + } + + if (nla_attr_size(skb->len) > USHRT_MAX) { + err = -EFBIG; + goto out; + } + + user_skb = genlmsg_new(upcall_msg_size(skb, upcall_info->userdata), 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, upcall_info->key, user_skb); + nla_nest_end(user_skb, nla); + + if (upcall_info->userdata) + __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, + nla_len(upcall_info->userdata), + nla_data(upcall_info->userdata)); + + nla = __nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, skb->len); + + skb_copy_and_csum_dev(skb, nla_data(nla)); + + genlmsg_end(user_skb, upcall); + err = genlmsg_unicast(net, user_skb, upcall_info->portid); + +out: + kfree_skb(nskb); + return err; +} + +/* Called with ovs_mutex. */ +static int flush_flows(struct datapath *dp) +{ + struct flow_table *old_table; + struct flow_table *new_table; + + old_table = ovsl_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_destroy(old_table, true); + return 0; +} + +static struct nlattr *reserve_sfa_size(struct sw_flow_actions **sfa, int attr_len) +{ + + struct sw_flow_actions *acts; + int new_acts_size; + int req_size = NLA_ALIGN(attr_len); + int next_offset = offsetof(struct sw_flow_actions, actions) + + (*sfa)->actions_len; + + if (req_size <= (ksize(*sfa) - next_offset)) + goto out; + + new_acts_size = ksize(*sfa) * 2; + + if (new_acts_size > MAX_ACTIONS_BUFSIZE) { + if ((MAX_ACTIONS_BUFSIZE - next_offset) < req_size) + return ERR_PTR(-EMSGSIZE); + new_acts_size = MAX_ACTIONS_BUFSIZE; + } + + acts = ovs_flow_actions_alloc(new_acts_size); + if (IS_ERR(acts)) + return (void *)acts; + + memcpy(acts->actions, (*sfa)->actions, (*sfa)->actions_len); + acts->actions_len = (*sfa)->actions_len; + kfree(*sfa); + *sfa = acts; + +out: + (*sfa)->actions_len += req_size; + return (struct nlattr *) ((unsigned char *)(*sfa) + next_offset); +} + +static int add_action(struct sw_flow_actions **sfa, int attrtype, void *data, int len) +{ + struct nlattr *a; + + a = reserve_sfa_size(sfa, nla_attr_size(len)); + if (IS_ERR(a)) + return PTR_ERR(a); + + a->nla_type = attrtype; + a->nla_len = nla_attr_size(len); + + if (data) + memcpy(nla_data(a), data, len); + memset((unsigned char *) a + a->nla_len, 0, nla_padlen(len)); + + return 0; +} + +static inline int add_nested_action_start(struct sw_flow_actions **sfa, int attrtype) +{ + int used = (*sfa)->actions_len; + int err; + + err = add_action(sfa, attrtype, NULL, 0); + if (err) + return err; + + return used; +} + +static inline void add_nested_action_end(struct sw_flow_actions *sfa, int st_offset) +{ + struct nlattr *a = (struct nlattr *) ((unsigned char *)sfa->actions + st_offset); + + a->nla_len = sfa->actions_len - st_offset; +} + +static int validate_and_copy_actions(const struct nlattr *attr, + const struct sw_flow_key *key, int depth, + struct sw_flow_actions **sfa); + +static int validate_and_copy_sample(const struct nlattr *attr, + const struct sw_flow_key *key, int depth, + struct sw_flow_actions **sfa) +{ + const struct nlattr *attrs[OVS_SAMPLE_ATTR_MAX + 1]; + const struct nlattr *probability, *actions; + const struct nlattr *a; + int rem, start, err, st_acts; + + 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; + + /* validation done, copy sample action. */ + start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SAMPLE); + if (start < 0) + return start; + err = add_action(sfa, OVS_SAMPLE_ATTR_PROBABILITY, nla_data(probability), sizeof(u32)); + if (err) + return err; + st_acts = add_nested_action_start(sfa, OVS_SAMPLE_ATTR_ACTIONS); + if (st_acts < 0) + return st_acts; + + err = validate_and_copy_actions(actions, key, depth + 1, sfa); + if (err) + return err; + + add_nested_action_end(*sfa, st_acts); + add_nested_action_end(*sfa, start); + + return 0; +} + +static int validate_tp_port(const struct sw_flow_key *flow_key) +{ + if (flow_key->eth.type == htons(ETH_P_IP)) { + if (flow_key->ipv4.tp.src || flow_key->ipv4.tp.dst) + return 0; + } else if (flow_key->eth.type == htons(ETH_P_IPV6)) { + if (flow_key->ipv6.tp.src || flow_key->ipv6.tp.dst) + return 0; + } + + return -EINVAL; +} + +static int validate_and_copy_set_tun(const struct nlattr *attr, + struct sw_flow_actions **sfa) +{ + struct sw_flow_match match; + struct sw_flow_key key; + int err, start; + + ovs_match_init(&match, &key, NULL); + err = ovs_ipv4_tun_from_nlattr(nla_data(attr), &match, false); + if (err) + return err; + + start = add_nested_action_start(sfa, OVS_ACTION_ATTR_SET); + if (start < 0) + return start; + + err = add_action(sfa, OVS_KEY_ATTR_IPV4_TUNNEL, &match.key->tun_key, + sizeof(match.key->tun_key)); + add_nested_action_end(*sfa, start); + + return err; +} + +static int validate_set(const struct nlattr *a, + const struct sw_flow_key *flow_key, + struct sw_flow_actions **sfa, + bool *set_tun) +{ + 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 || + (ovs_key_lens[key_type] != nla_len(ovs_key) && + ovs_key_lens[key_type] != -1)) + return -EINVAL; + + switch (key_type) { + const struct ovs_key_ipv4 *ipv4_key; + const struct ovs_key_ipv6 *ipv6_key; + int err; + + case OVS_KEY_ATTR_PRIORITY: + case OVS_KEY_ATTR_SKB_MARK: + case OVS_KEY_ATTR_ETHERNET: + break; + + case OVS_KEY_ATTR_TUNNEL: + *set_tun = true; + err = validate_and_copy_set_tun(a, sfa); + if (err) + return err; + break; + + case OVS_KEY_ATTR_IPV4: + if (flow_key->eth.type != htons(ETH_P_IP)) + return -EINVAL; + + if (!flow_key->ip.proto) + 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_IPV6: + if (flow_key->eth.type != htons(ETH_P_IPV6)) + return -EINVAL; + + if (!flow_key->ip.proto) + return -EINVAL; + + ipv6_key = nla_data(ovs_key); + if (ipv6_key->ipv6_proto != flow_key->ip.proto) + return -EINVAL; + + if (ipv6_key->ipv6_frag != flow_key->ip.frag) + return -EINVAL; + + if (ntohl(ipv6_key->ipv6_label) & 0xFFF00000) + return -EINVAL; + + break; + + case OVS_KEY_ATTR_TCP: + if (flow_key->ip.proto != IPPROTO_TCP) + return -EINVAL; + + return validate_tp_port(flow_key); + + case OVS_KEY_ATTR_UDP: + if (flow_key->ip.proto != IPPROTO_UDP) + return -EINVAL; + + return validate_tp_port(flow_key); + + case OVS_KEY_ATTR_SCTP: + if (flow_key->ip.proto != IPPROTO_SCTP) + return -EINVAL; + + return validate_tp_port(flow_key); + + 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_UNSPEC }, + }; + 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 copy_action(const struct nlattr *from, + struct sw_flow_actions **sfa) +{ + int totlen = NLA_ALIGN(from->nla_len); + struct nlattr *to; + + to = reserve_sfa_size(sfa, from->nla_len); + if (IS_ERR(to)) + return PTR_ERR(to); + + memcpy(to, from, totlen); + return 0; +} + +static int validate_and_copy_actions(const struct nlattr *attr, + const struct sw_flow_key *key, + int depth, + struct sw_flow_actions **sfa) +{ + 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); + bool skip_copy; + + if (type > OVS_ACTION_ATTR_MAX || + (action_lens[type] != nla_len(a) && + action_lens[type] != (u32)-1)) + return -EINVAL; + + skip_copy = false; + 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, sfa, &skip_copy); + if (err) + return err; + break; + + case OVS_ACTION_ATTR_SAMPLE: + err = validate_and_copy_sample(a, key, depth, sfa); + if (err) + return err; + skip_copy = true; + break; + + default: + return -EINVAL; + } + if (!skip_copy) { + err = copy_action(a, sfa); + if (err) + return err; + } + } + + 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; + + err = -EINVAL; + if (!a[OVS_PACKET_ATTR_PACKET] || !a[OVS_PACKET_ATTR_KEY] || + !a[OVS_PACKET_ATTR_ACTIONS]) + 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); + + nla_memcpy(__skb_put(packet, len), 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) >= ETH_P_802_3_MIN) + 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); + if (err) + goto err_flow_free; + + err = ovs_flow_metadata_from_nlattrs(flow, a[OVS_PACKET_ATTR_KEY]); + if (err) + goto err_flow_free; + acts = ovs_flow_actions_alloc(nla_len(a[OVS_PACKET_ATTR_ACTIONS])); + err = PTR_ERR(acts); + if (IS_ERR(acts)) + goto err_flow_free; + + err = validate_and_copy_actions(a[OVS_PACKET_ATTR_ACTIONS], &flow->key, 0, &acts); + rcu_assign_pointer(flow->sf_acts, acts); + if (err) + goto err_flow_free; + + OVS_CB(packet)->flow = flow; + OVS_CB(packet)->pkt_key = &flow->key; + packet->priority = flow->key.phy.priority; + packet->mark = flow->key.phy.skb_mark; + + rcu_read_lock(); + dp = get_dp(sock_net(skb->sk), 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, false); + return err; + +err_unlock: + rcu_read_unlock(); +err_flow_free: + ovs_flow_free(flow, false); +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] = { .len = ETH_HLEN }, + [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) +{ + struct flow_table *table; + int i; + + table = rcu_dereference_check(dp->table, lockdep_ovsl_is_held()); + 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, + .netnsok = true, + .parallel_ops = true, +}; + +static struct genl_multicast_group ovs_dp_flow_multicast_group = { + .name = OVS_FLOW_MCGROUP +}; + +static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb); +static int sample_action_to_attr(const struct nlattr *attr, struct sk_buff *skb) +{ + const struct nlattr *a; + struct nlattr *start; + int err = 0, rem; + + start = nla_nest_start(skb, OVS_ACTION_ATTR_SAMPLE); + if (!start) + return -EMSGSIZE; + + nla_for_each_nested(a, attr, rem) { + int type = nla_type(a); + struct nlattr *st_sample; + + switch (type) { + case OVS_SAMPLE_ATTR_PROBABILITY: + if (nla_put(skb, OVS_SAMPLE_ATTR_PROBABILITY, sizeof(u32), nla_data(a))) + return -EMSGSIZE; + break; + case OVS_SAMPLE_ATTR_ACTIONS: + st_sample = nla_nest_start(skb, OVS_SAMPLE_ATTR_ACTIONS); + if (!st_sample) + return -EMSGSIZE; + err = actions_to_attr(nla_data(a), nla_len(a), skb); + if (err) + return err; + nla_nest_end(skb, st_sample); + break; + } + } + + nla_nest_end(skb, start); + return err; +} + +static int set_action_to_attr(const struct nlattr *a, struct sk_buff *skb) +{ + const struct nlattr *ovs_key = nla_data(a); + int key_type = nla_type(ovs_key); + struct nlattr *start; + int err; + + switch (key_type) { + case OVS_KEY_ATTR_IPV4_TUNNEL: + start = nla_nest_start(skb, OVS_ACTION_ATTR_SET); + if (!start) + return -EMSGSIZE; + + err = ovs_ipv4_tun_to_nlattr(skb, nla_data(ovs_key), + nla_data(ovs_key)); + if (err) + return err; + nla_nest_end(skb, start); + break; + default: + if (nla_put(skb, OVS_ACTION_ATTR_SET, nla_len(a), ovs_key)) + return -EMSGSIZE; + break; + } + + return 0; +} + +static int actions_to_attr(const struct nlattr *attr, int len, struct sk_buff *skb) +{ + const struct nlattr *a; + int rem, err; + + nla_for_each_attr(a, attr, len, rem) { + int type = nla_type(a); + + switch (type) { + case OVS_ACTION_ATTR_SET: + err = set_action_to_attr(a, skb); + if (err) + return err; + break; + + case OVS_ACTION_ATTR_SAMPLE: + err = sample_action_to_attr(a, skb); + if (err) + return err; + break; + default: + if (nla_put(skb, type, nla_len(a), nla_data(a))) + return -EMSGSIZE; + break; + } + } + + return 0; +} + +static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts) +{ + return NLMSG_ALIGN(sizeof(struct ovs_header)) + + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_KEY */ + + nla_total_size(key_attr_size()) /* OVS_FLOW_ATTR_MASK */ + + nla_total_size(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ + + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ + + nla_total_size(8) /* OVS_FLOW_ATTR_USED */ + + nla_total_size(acts->actions_len); /* OVS_FLOW_ATTR_ACTIONS */ +} + +/* Called with ovs_mutex. */ +static int ovs_flow_cmd_fill_info(struct sw_flow *flow, struct datapath *dp, + struct sk_buff *skb, u32 portid, + u32 seq, u32 flags, u8 cmd) +{ + const int skb_orig_len = skb->len; + struct nlattr *start; + struct ovs_flow_stats stats; + struct ovs_header *ovs_header; + struct nlattr *nla; + unsigned long used; + u8 tcp_flags; + int err; + + ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, flags, cmd); + if (!ovs_header) + return -EMSGSIZE; + + ovs_header->dp_ifindex = get_dpifindex(dp); + + /* Fill flow key. */ + nla = nla_nest_start(skb, OVS_FLOW_ATTR_KEY); + if (!nla) + goto nla_put_failure; + + err = ovs_flow_to_nlattrs(&flow->unmasked_key, + &flow->unmasked_key, skb); + if (err) + goto error; + nla_nest_end(skb, nla); + + nla = nla_nest_start(skb, OVS_FLOW_ATTR_MASK); + if (!nla) + goto nla_put_failure; + + err = ovs_flow_to_nlattrs(&flow->key, &flow->mask->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))) + goto nla_put_failure; + + if (stats.n_packets && + nla_put(skb, OVS_FLOW_ATTR_STATS, + sizeof(struct ovs_flow_stats), &stats)) + goto nla_put_failure; + + if (tcp_flags && + nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, tcp_flags)) + goto nla_put_failure; + + /* 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. + */ + start = nla_nest_start(skb, OVS_FLOW_ATTR_ACTIONS); + if (start) { + const struct sw_flow_actions *sf_acts; + + sf_acts = rcu_dereference_check(flow->sf_acts, + lockdep_ovsl_is_held()); + + err = actions_to_attr(sf_acts->actions, sf_acts->actions_len, skb); + if (!err) + nla_nest_end(skb, start); + else { + if (skb_orig_len) + goto error; + + nla_nest_cancel(skb, start); + } + } else if (skb_orig_len) + goto nla_put_failure; + + 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; + + sf_acts = ovsl_dereference(flow->sf_acts); + + return genlmsg_new(ovs_flow_cmd_msg_size(sf_acts), GFP_KERNEL); +} + +static struct sk_buff *ovs_flow_cmd_build_info(struct sw_flow *flow, + struct datapath *dp, + u32 portid, 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, portid, 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, masked_key; + struct sw_flow *flow = NULL; + struct sw_flow_mask mask; + struct sk_buff *reply; + struct datapath *dp; + struct flow_table *table; + struct sw_flow_actions *acts = NULL; + struct sw_flow_match match; + int error; + + /* Extract key. */ + error = -EINVAL; + if (!a[OVS_FLOW_ATTR_KEY]) + goto error; + + ovs_match_init(&match, &key, &mask); + error = ovs_match_from_nlattrs(&match, + a[OVS_FLOW_ATTR_KEY], a[OVS_FLOW_ATTR_MASK]); + if (error) + goto error; + + /* Validate actions. */ + if (a[OVS_FLOW_ATTR_ACTIONS]) { + acts = ovs_flow_actions_alloc(nla_len(a[OVS_FLOW_ATTR_ACTIONS])); + error = PTR_ERR(acts); + if (IS_ERR(acts)) + goto error; + + ovs_flow_key_mask(&masked_key, &key, &mask); + error = validate_and_copy_actions(a[OVS_FLOW_ATTR_ACTIONS], + &masked_key, 0, &acts); + if (error) { + OVS_NLERR("Flow actions may not be safe on all matching packets.\n"); + goto err_kfree; + } + } else if (info->genlhdr->cmd == OVS_FLOW_CMD_NEW) { + error = -EINVAL; + goto error; + } + + ovs_lock(); + dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); + error = -ENODEV; + if (!dp) + goto err_unlock_ovs; + + table = ovsl_dereference(dp->table); + + /* Check if this is a duplicate flow */ + flow = ovs_flow_lookup(table, &key); + if (!flow) { + struct sw_flow_mask *mask_p; + /* Bail out if we're not allowed to create a new flow. */ + error = -ENOENT; + if (info->genlhdr->cmd == OVS_FLOW_CMD_SET) + goto err_unlock_ovs; + + /* 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_destroy(table, true); + table = ovsl_dereference(dp->table); + } + } + + /* Allocate flow. */ + flow = ovs_flow_alloc(); + if (IS_ERR(flow)) { + error = PTR_ERR(flow); + goto err_unlock_ovs; + } + clear_stats(flow); + + flow->key = masked_key; + flow->unmasked_key = key; + + /* Make sure mask is unique in the system */ + mask_p = ovs_sw_flow_mask_find(table, &mask); + if (!mask_p) { + /* Allocate a new mask if none exsits. */ + mask_p = ovs_sw_flow_mask_alloc(); + if (!mask_p) + goto err_flow_free; + mask_p->key = mask.key; + mask_p->range = mask.range; + ovs_sw_flow_mask_insert(table, mask_p); + } + + ovs_sw_flow_mask_add_ref(mask_p); + flow->mask = mask_p; + rcu_assign_pointer(flow->sf_acts, acts); + + /* Put flow in bucket. */ + ovs_flow_insert(table, flow); + + reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, + info->snd_seq, OVS_FLOW_CMD_NEW); + } else { + /* We found a matching flow. */ + struct sw_flow_actions *old_acts; + + /* 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 err_unlock_ovs; + + /* The unmasked key has to be the same for flow updates. */ + error = -EINVAL; + if (!ovs_flow_cmp_unmasked_key(flow, &key, match.range.end)) { + OVS_NLERR("Flow modification message rejected, unmasked key does not match.\n"); + goto err_unlock_ovs; + } + + /* Update actions. */ + old_acts = ovsl_dereference(flow->sf_acts); + rcu_assign_pointer(flow->sf_acts, acts); + ovs_flow_deferred_free_acts(old_acts); + + reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, + 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); + } + } + ovs_unlock(); + + if (!IS_ERR(reply)) + ovs_notify(reply, info, &ovs_dp_flow_multicast_group); + else + netlink_set_err(sock_net(skb->sk)->genl_sock, 0, + ovs_dp_flow_multicast_group.id, PTR_ERR(reply)); + return 0; + +err_flow_free: + ovs_flow_free(flow, false); +err_unlock_ovs: + ovs_unlock(); +err_kfree: + kfree(acts); +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; + struct sw_flow_match match; + int err; + + if (!a[OVS_FLOW_ATTR_KEY]) { + OVS_NLERR("Flow get message rejected, Key attribute missing.\n"); + return -EINVAL; + } + + ovs_match_init(&match, &key, NULL); + err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); + if (err) + return err; + + ovs_lock(); + dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); + if (!dp) { + err = -ENODEV; + goto unlock; + } + + table = ovsl_dereference(dp->table); + flow = ovs_flow_lookup_unmasked_key(table, &match); + if (!flow) { + err = -ENOENT; + goto unlock; + } + + reply = ovs_flow_cmd_build_info(flow, dp, info->snd_portid, + info->snd_seq, OVS_FLOW_CMD_NEW); + if (IS_ERR(reply)) { + err = PTR_ERR(reply); + goto unlock; + } + + ovs_unlock(); + return genlmsg_reply(reply, info); +unlock: + ovs_unlock(); + return err; +} + +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; + struct sw_flow_match match; + int err; + + ovs_lock(); + dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); + if (!dp) { + err = -ENODEV; + goto unlock; + } + + if (!a[OVS_FLOW_ATTR_KEY]) { + err = flush_flows(dp); + goto unlock; + } + + ovs_match_init(&match, &key, NULL); + err = ovs_match_from_nlattrs(&match, a[OVS_FLOW_ATTR_KEY], NULL); + if (err) + goto unlock; + + table = ovsl_dereference(dp->table); + flow = ovs_flow_lookup_unmasked_key(table, &match); + if (!flow) { + err = -ENOENT; + goto unlock; + } + + reply = ovs_flow_cmd_alloc_info(flow); + if (!reply) { + err = -ENOMEM; + goto unlock; + } + + ovs_flow_remove(table, flow); + + err = ovs_flow_cmd_fill_info(flow, dp, reply, info->snd_portid, + info->snd_seq, 0, OVS_FLOW_CMD_DEL); + BUG_ON(err < 0); + + ovs_flow_free(flow, true); + ovs_unlock(); + + ovs_notify(reply, info, &ovs_dp_flow_multicast_group); + return 0; +unlock: + ovs_unlock(); + return err; +} + +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; + + rcu_read_lock(); + dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); + if (!dp) { + rcu_read_unlock(); + return -ENODEV; + } + + table = rcu_dereference(dp->table); + for (;;) { + struct sw_flow *flow; + u32 bucket, obj; + + bucket = cb->args[0]; + obj = cb->args[1]; + flow = ovs_flow_dump_next(table, &bucket, &obj); + if (!flow) + break; + + if (ovs_flow_cmd_fill_info(flow, dp, skb, + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, + OVS_FLOW_CMD_NEW) < 0) + break; + + cb->args[0] = bucket; + cb->args[1] = obj; + } + rcu_read_unlock(); + 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, + .netnsok = true, + .parallel_ops = true, +}; + +static struct genl_multicast_group ovs_dp_datapath_multicast_group = { + .name = OVS_DATAPATH_MCGROUP +}; + +static size_t ovs_dp_cmd_msg_size(void) +{ + size_t msgsize = NLMSG_ALIGN(sizeof(struct ovs_header)); + + msgsize += nla_total_size(IFNAMSIZ); + msgsize += nla_total_size(sizeof(struct ovs_dp_stats)); + + return msgsize; +} + +static int ovs_dp_cmd_fill_info(struct datapath *dp, struct sk_buff *skb, + u32 portid, u32 seq, u32 flags, u8 cmd) +{ + struct ovs_header *ovs_header; + struct ovs_dp_stats dp_stats; + int err; + + ovs_header = genlmsg_put(skb, portid, 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); + if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), &dp_stats)) + goto nla_put_failure; + + 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 portid, + u32 seq, u8 cmd) +{ + struct sk_buff *skb; + int retval; + + skb = genlmsg_new(ovs_dp_cmd_msg_size(), GFP_KERNEL); + if (!skb) + return ERR_PTR(-ENOMEM); + + retval = ovs_dp_cmd_fill_info(dp, skb, portid, seq, 0, cmd); + if (retval < 0) { + kfree_skb(skb); + return ERR_PTR(retval); + } + return skb; +} + +/* Called with ovs_mutex. */ +static struct datapath *lookup_datapath(struct net *net, + 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(net, ovs_header->dp_ifindex); + else { + struct vport *vport; + + rcu_read_lock(); + vport = ovs_vport_locate(net, 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; + struct ovs_net *ovs_net; + int err, i; + + err = -EINVAL; + if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) + goto err; + + ovs_lock(); + + err = -ENOMEM; + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (dp == NULL) + goto err_unlock_ovs; + + ovs_dp_set_net(dp, hold_net(sock_net(skb->sk))); + + /* 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; + } + + dp->ports = kmalloc(DP_VPORT_HASH_BUCKETS * sizeof(struct hlist_head), + GFP_KERNEL); + if (!dp->ports) { + err = -ENOMEM; + goto err_destroy_percpu; + } + + for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) + INIT_HLIST_HEAD(&dp->ports[i]); + + /* 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_portid = 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_ports_array; + } + + reply = ovs_dp_cmd_build_info(dp, info->snd_portid, + info->snd_seq, OVS_DP_CMD_NEW); + err = PTR_ERR(reply); + if (IS_ERR(reply)) + goto err_destroy_local_port; + + ovs_net = net_generic(ovs_dp_get_net(dp), ovs_net_id); + list_add_tail_rcu(&dp->list_node, &ovs_net->dps); + + ovs_unlock(); + + ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); + return 0; + +err_destroy_local_port: + ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); +err_destroy_ports_array: + kfree(dp->ports); +err_destroy_percpu: + free_percpu(dp->stats_percpu); +err_destroy_table: + ovs_flow_tbl_destroy(ovsl_dereference(dp->table), false); +err_free_dp: + release_net(ovs_dp_get_net(dp)); + kfree(dp); +err_unlock_ovs: + ovs_unlock(); +err: + return err; +} + +/* Called with ovs_mutex. */ +static void __dp_destroy(struct datapath *dp) +{ + int i; + + for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { + struct vport *vport; + struct hlist_node *n; + + hlist_for_each_entry_safe(vport, n, &dp->ports[i], dp_hash_node) + if (vport->port_no != OVSP_LOCAL) + ovs_dp_detach_port(vport); + } + + list_del_rcu(&dp->list_node); + + /* OVSP_LOCAL is datapath internal port. We need to make sure that + * all port in datapath are destroyed first before freeing datapath. + */ + ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); + + call_rcu(&dp->rcu, destroy_dp_rcu); +} + +static int ovs_dp_cmd_del(struct sk_buff *skb, struct genl_info *info) +{ + struct sk_buff *reply; + struct datapath *dp; + int err; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); + err = PTR_ERR(dp); + if (IS_ERR(dp)) + goto unlock; + + reply = ovs_dp_cmd_build_info(dp, info->snd_portid, + info->snd_seq, OVS_DP_CMD_DEL); + err = PTR_ERR(reply); + if (IS_ERR(reply)) + goto unlock; + + __dp_destroy(dp); + ovs_unlock(); + + ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); + + return 0; +unlock: + ovs_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; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); + err = PTR_ERR(dp); + if (IS_ERR(dp)) + goto unlock; + + reply = ovs_dp_cmd_build_info(dp, info->snd_portid, + info->snd_seq, OVS_DP_CMD_NEW); + if (IS_ERR(reply)) { + err = PTR_ERR(reply); + netlink_set_err(sock_net(skb->sk)->genl_sock, 0, + ovs_dp_datapath_multicast_group.id, err); + err = 0; + goto unlock; + } + + ovs_unlock(); + ovs_notify(reply, info, &ovs_dp_datapath_multicast_group); + + return 0; +unlock: + ovs_unlock(); + return err; +} + +static int ovs_dp_cmd_get(struct sk_buff *skb, struct genl_info *info) +{ + struct sk_buff *reply; + struct datapath *dp; + int err; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); + if (IS_ERR(dp)) { + err = PTR_ERR(dp); + goto unlock; + } + + reply = ovs_dp_cmd_build_info(dp, info->snd_portid, + info->snd_seq, OVS_DP_CMD_NEW); + if (IS_ERR(reply)) { + err = PTR_ERR(reply); + goto unlock; + } + + ovs_unlock(); + return genlmsg_reply(reply, info); + +unlock: + ovs_unlock(); + return err; +} + +static int ovs_dp_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) +{ + struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id); + struct datapath *dp; + int skip = cb->args[0]; + int i = 0; + + rcu_read_lock(); + list_for_each_entry_rcu(dp, &ovs_net->dps, list_node) { + if (i >= skip && + ovs_dp_cmd_fill_info(dp, skb, NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, NLM_F_MULTI, + OVS_DP_CMD_NEW) < 0) + break; + i++; + } + rcu_read_unlock(); + + 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, + .netnsok = true, + .parallel_ops = true, +}; + +struct genl_multicast_group ovs_dp_vport_multicast_group = { + .name = OVS_VPORT_MCGROUP +}; + +/* Called with ovs_mutex or RCU read lock. */ +static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, + u32 portid, u32 seq, u32 flags, u8 cmd) +{ + struct ovs_header *ovs_header; + struct ovs_vport_stats vport_stats; + int err; + + ovs_header = genlmsg_put(skb, portid, seq, &dp_vport_genl_family, + flags, cmd); + if (!ovs_header) + return -EMSGSIZE; + + ovs_header->dp_ifindex = get_dpifindex(vport->dp); + + if (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_portid)) + goto nla_put_failure; + + ovs_vport_get_stats(vport, &vport_stats); + if (nla_put(skb, OVS_VPORT_ATTR_STATS, sizeof(struct ovs_vport_stats), + &vport_stats)) + goto nla_put_failure; + + 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 ovs_mutex or RCU read lock. */ +struct sk_buff *ovs_vport_cmd_build_info(struct vport *vport, u32 portid, + 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, portid, seq, 0, cmd); + BUG_ON(retval < 0); + + return skb; +} + +/* Called with ovs_mutex or RCU read lock. */ +static struct vport *lookup_vport(struct net *net, + 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(net, 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(net, ovs_header->dp_ifindex); + if (!dp) + return ERR_PTR(-ENODEV); + + vport = ovs_vport_ovsl_rcu(dp, port_no); + if (!vport) + return ERR_PTR(-ENODEV); + 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; + + ovs_lock(); + dp = get_dp(sock_net(skb->sk), 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 = ovs_vport_ovsl(dp, 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 = ovs_vport_ovsl(dp, 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_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); + + vport = new_vport(&parms); + err = PTR_ERR(vport); + if (IS_ERR(vport)) + goto exit_unlock; + + err = 0; + reply = ovs_vport_cmd_build_info(vport, info->snd_portid, info->snd_seq, + OVS_VPORT_CMD_NEW); + if (IS_ERR(reply)) { + err = PTR_ERR(reply); + ovs_dp_detach_port(vport); + goto exit_unlock; + } + + ovs_notify(reply, info, &ovs_dp_vport_multicast_group); + +exit_unlock: + ovs_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; + + ovs_lock(); + vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); + err = PTR_ERR(vport); + if (IS_ERR(vport)) + goto exit_unlock; + + if (a[OVS_VPORT_ATTR_TYPE] && + nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { + err = -EINVAL; + goto exit_unlock; + } + + reply = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!reply) { + err = -ENOMEM; + goto exit_unlock; + } + + if (a[OVS_VPORT_ATTR_OPTIONS]) { + err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); + if (err) + goto exit_free; + } + + if (a[OVS_VPORT_ATTR_UPCALL_PID]) + vport->upcall_portid = nla_get_u32(a[OVS_VPORT_ATTR_UPCALL_PID]); + + err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, + info->snd_seq, 0, OVS_VPORT_CMD_NEW); + BUG_ON(err < 0); + + ovs_unlock(); + ovs_notify(reply, info, &ovs_dp_vport_multicast_group); + return 0; + +exit_free: + kfree_skb(reply); +exit_unlock: + ovs_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; + + ovs_lock(); + vport = lookup_vport(sock_net(skb->sk), 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_portid, + info->snd_seq, OVS_VPORT_CMD_DEL); + err = PTR_ERR(reply); + if (IS_ERR(reply)) + goto exit_unlock; + + err = 0; + ovs_dp_detach_port(vport); + + ovs_notify(reply, info, &ovs_dp_vport_multicast_group); + +exit_unlock: + ovs_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(sock_net(skb->sk), ovs_header, a); + err = PTR_ERR(vport); + if (IS_ERR(vport)) + goto exit_unlock; + + reply = ovs_vport_cmd_build_info(vport, info->snd_portid, + 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; + int bucket = cb->args[0], skip = cb->args[1]; + int i, j = 0; + + dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); + if (!dp) + return -ENODEV; + + rcu_read_lock(); + for (i = bucket; i < DP_VPORT_HASH_BUCKETS; i++) { + struct vport *vport; + + j = 0; + hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node) { + if (j >= skip && + ovs_vport_cmd_fill_info(vport, skb, + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NLM_F_MULTI, + OVS_VPORT_CMD_NEW) < 0) + goto out; + + j++; + } + skip = 0; + } +out: + rcu_read_unlock(); + + cb->args[0] = i; + cb->args[1] = j; + + return skb->len; +} + +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 void rehash_flow_table(struct work_struct *work) +{ + struct datapath *dp; + struct net *net; + + ovs_lock(); + rtnl_lock(); + for_each_net(net) { + struct ovs_net *ovs_net = net_generic(net, ovs_net_id); + + list_for_each_entry(dp, &ovs_net->dps, list_node) { + struct flow_table *old_table = ovsl_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_destroy(old_table, true); + } + } + } + rtnl_unlock(); + ovs_unlock(); + schedule_delayed_work(&rehash_flow_wq, REHASH_FLOW_INTERVAL); +} + +static int __net_init ovs_init_net(struct net *net) +{ + struct ovs_net *ovs_net = net_generic(net, ovs_net_id); + + INIT_LIST_HEAD(&ovs_net->dps); + INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); + return 0; +} + +static void __net_exit ovs_exit_net(struct net *net) +{ + struct datapath *dp, *dp_next; + struct ovs_net *ovs_net = net_generic(net, ovs_net_id); + + ovs_lock(); + list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) + __dp_destroy(dp); + ovs_unlock(); + + cancel_work_sync(&ovs_net->dp_notify_work); +} + +static struct pernet_operations ovs_net_ops = { + .init = ovs_init_net, + .exit = ovs_exit_net, + .id = &ovs_net_id, + .size = sizeof(struct ovs_net), +}; + +static int __init dp_init(void) +{ + int err; + + BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > FIELD_SIZEOF(struct sk_buff, 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_pernet_device(&ovs_net_ops); + if (err) + goto error_vport_exit; + + err = register_netdevice_notifier(&ovs_dp_device_notifier); + if (err) + goto error_netns_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_netns_exit: + unregister_pernet_device(&ovs_net_ops); +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); + dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); + unregister_netdevice_notifier(&ovs_dp_device_notifier); + unregister_pernet_device(&ovs_net_ops); + rcu_barrier(); + ovs_vport_exit(); + ovs_flow_exit(); +} + +module_init(dp_init); +module_exit(dp_cleanup); + +MODULE_DESCRIPTION("Open vSwitch switching datapath"); +MODULE_LICENSE("GPL"); |