| /* |
| * Copyright (c) 2007-2014 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 <net/genetlink.h> |
| #include <net/net_namespace.h> |
| #include <net/netns/generic.h> |
| |
| #include "datapath.h" |
| #include "flow.h" |
| #include "flow_table.h" |
| #include "flow_netlink.h" |
| #include "vport-internal_dev.h" |
| #include "vport-netdev.h" |
| |
| int ovs_net_id __read_mostly; |
| EXPORT_SYMBOL_GPL(ovs_net_id); |
| |
| static struct genl_family dp_packet_genl_family; |
| static struct genl_family dp_flow_genl_family; |
| static struct genl_family dp_datapath_genl_family; |
| |
| static const struct nla_policy flow_policy[]; |
| |
| static const struct genl_multicast_group ovs_dp_flow_multicast_group = { |
| .name = OVS_FLOW_MCGROUP, |
| }; |
| |
| static const struct genl_multicast_group ovs_dp_datapath_multicast_group = { |
| .name = OVS_DATAPATH_MCGROUP, |
| }; |
| |
| static const struct genl_multicast_group ovs_dp_vport_multicast_group = { |
| .name = OVS_VPORT_MCGROUP, |
| }; |
| |
| /* Check if need to build a reply message. |
| * OVS userspace sets the NLM_F_ECHO flag if it needs the reply. */ |
| static bool ovs_must_notify(struct genl_family *family, struct genl_info *info, |
| unsigned int group) |
| { |
| return info->nlhdr->nlmsg_flags & NLM_F_ECHO || |
| genl_has_listeners(family, genl_info_net(info), group); |
| } |
| |
| static void ovs_notify(struct genl_family *family, |
| struct sk_buff *skb, struct genl_info *info) |
| { |
| genl_notify(family, skb, info, 0, 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; |
| } |
| EXPORT_SYMBOL_GPL(lockdep_ovsl_is_held); |
| #endif |
| |
| static struct vport *new_vport(const struct vport_parms *); |
| static int queue_gso_packets(struct datapath *dp, struct sk_buff *, |
| const struct sw_flow_key *, |
| const struct dp_upcall_info *); |
| static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, |
| const struct sw_flow_key *, |
| const struct dp_upcall_info *); |
| |
| /* Must be called with rcu_read_lock. */ |
| static struct datapath *get_dp_rcu(struct net *net, int dp_ifindex) |
| { |
| struct net_device *dev = dev_get_by_index_rcu(net, dp_ifindex); |
| |
| if (dev) { |
| struct vport *vport = ovs_internal_dev_get_vport(dev); |
| if (vport) |
| return vport->dp; |
| } |
| |
| return NULL; |
| } |
| |
| /* The caller must hold either ovs_mutex or rcu_read_lock to keep the |
| * returned dp pointer valid. |
| */ |
| static inline struct datapath *get_dp(struct net *net, int dp_ifindex) |
| { |
| struct datapath *dp; |
| |
| WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_ovsl_is_held()); |
| rcu_read_lock(); |
| dp = get_dp_rcu(net, dp_ifindex); |
| 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 ovs_vport_name(vport); |
| } |
| |
| static int get_dpifindex(const struct datapath *dp) |
| { |
| struct vport *local; |
| int ifindex; |
| |
| rcu_read_lock(); |
| |
| local = ovs_vport_rcu(dp, OVSP_LOCAL); |
| if (local) |
| ifindex = 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(&dp->table); |
| free_percpu(dp->stats_percpu); |
| 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)]; |
| } |
| |
| /* Called with ovs_mutex or RCU read lock. */ |
| 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_packet(struct sk_buff *skb, struct sw_flow_key *key) |
| { |
| const struct vport *p = OVS_CB(skb)->input_vport; |
| struct datapath *dp = p->dp; |
| struct sw_flow *flow; |
| struct sw_flow_actions *sf_acts; |
| struct dp_stats_percpu *stats; |
| u64 *stats_counter; |
| u32 n_mask_hit; |
| |
| stats = this_cpu_ptr(dp->stats_percpu); |
| |
| /* Look up flow. */ |
| flow = ovs_flow_tbl_lookup_stats(&dp->table, key, &n_mask_hit); |
| if (unlikely(!flow)) { |
| struct dp_upcall_info upcall; |
| int error; |
| |
| memset(&upcall, 0, sizeof(upcall)); |
| upcall.cmd = OVS_PACKET_CMD_MISS; |
| upcall.portid = ovs_vport_find_upcall_portid(p, skb); |
| upcall.mru = OVS_CB(skb)->mru; |
| error = ovs_dp_upcall(dp, skb, key, &upcall); |
| if (unlikely(error)) |
| kfree_skb(skb); |
| else |
| consume_skb(skb); |
| stats_counter = &stats->n_missed; |
| goto out; |
| } |
| |
| ovs_flow_stats_update(flow, key->tp.flags, skb); |
| sf_acts = rcu_dereference(flow->sf_acts); |
| ovs_execute_actions(dp, skb, sf_acts, key); |
| |
| stats_counter = &stats->n_hit; |
| |
| out: |
| /* Update datapath statistics. */ |
| u64_stats_update_begin(&stats->syncp); |
| (*stats_counter)++; |
| stats->n_mask_hit += n_mask_hit; |
| u64_stats_update_end(&stats->syncp); |
| } |
| |
| int ovs_dp_upcall(struct datapath *dp, struct sk_buff *skb, |
| const struct sw_flow_key *key, |
| const struct dp_upcall_info *upcall_info) |
| { |
| struct dp_stats_percpu *stats; |
| int err; |
| |
| if (upcall_info->portid == 0) { |
| err = -ENOTCONN; |
| goto err; |
| } |
| |
| if (!skb_is_gso(skb)) |
| err = queue_userspace_packet(dp, skb, key, upcall_info); |
| else |
| err = queue_gso_packets(dp, skb, key, upcall_info); |
| if (err) |
| goto err; |
| |
| return 0; |
| |
| err: |
| stats = this_cpu_ptr(dp->stats_percpu); |
| |
| u64_stats_update_begin(&stats->syncp); |
| stats->n_lost++; |
| u64_stats_update_end(&stats->syncp); |
| |
| return err; |
| } |
| |
| static int queue_gso_packets(struct datapath *dp, struct sk_buff *skb, |
| const struct sw_flow_key *key, |
| const struct dp_upcall_info *upcall_info) |
| { |
| unsigned short gso_type = skb_shinfo(skb)->gso_type; |
| struct sw_flow_key later_key; |
| struct sk_buff *segs, *nskb; |
| struct ovs_skb_cb ovs_cb; |
| int err; |
| |
| ovs_cb = *OVS_CB(skb); |
| segs = __skb_gso_segment(skb, NETIF_F_SG, false); |
| *OVS_CB(skb) = ovs_cb; |
| if (IS_ERR(segs)) |
| return PTR_ERR(segs); |
| if (segs == NULL) |
| return -EINVAL; |
| |
| if (gso_type & SKB_GSO_UDP) { |
| /* The initial flow key extracted by ovs_flow_key_extract() |
| * in this case is for a first fragment, so we need to |
| * properly mark later fragments. |
| */ |
| later_key = *key; |
| later_key.ip.frag = OVS_FRAG_TYPE_LATER; |
| } |
| |
| /* Queue all of the segments. */ |
| skb = segs; |
| do { |
| *OVS_CB(skb) = ovs_cb; |
| if (gso_type & SKB_GSO_UDP && skb != segs) |
| key = &later_key; |
| |
| err = queue_userspace_packet(dp, skb, key, upcall_info); |
| if (err) |
| break; |
| |
| } 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 upcall_msg_size(const struct dp_upcall_info *upcall_info, |
| unsigned int hdrlen) |
| { |
| size_t size = NLMSG_ALIGN(sizeof(struct ovs_header)) |
| + nla_total_size(hdrlen) /* OVS_PACKET_ATTR_PACKET */ |
| + nla_total_size(ovs_key_attr_size()); /* OVS_PACKET_ATTR_KEY */ |
| |
| /* OVS_PACKET_ATTR_USERDATA */ |
| if (upcall_info->userdata) |
| size += NLA_ALIGN(upcall_info->userdata->nla_len); |
| |
| /* OVS_PACKET_ATTR_EGRESS_TUN_KEY */ |
| if (upcall_info->egress_tun_info) |
| size += nla_total_size(ovs_tun_key_attr_size()); |
| |
| /* OVS_PACKET_ATTR_ACTIONS */ |
| if (upcall_info->actions_len) |
| size += nla_total_size(upcall_info->actions_len); |
| |
| /* OVS_PACKET_ATTR_MRU */ |
| if (upcall_info->mru) |
| size += nla_total_size(sizeof(upcall_info->mru)); |
| |
| return size; |
| } |
| |
| static void pad_packet(struct datapath *dp, struct sk_buff *skb) |
| { |
| if (!(dp->user_features & OVS_DP_F_UNALIGNED)) { |
| size_t plen = NLA_ALIGN(skb->len) - skb->len; |
| |
| if (plen > 0) |
| memset(skb_put(skb, plen), 0, plen); |
| } |
| } |
| |
| static int queue_userspace_packet(struct datapath *dp, struct sk_buff *skb, |
| const struct sw_flow_key *key, |
| const struct dp_upcall_info *upcall_info) |
| { |
| struct ovs_header *upcall; |
| struct sk_buff *nskb = NULL; |
| struct sk_buff *user_skb = NULL; /* to be queued to userspace */ |
| struct nlattr *nla; |
| struct genl_info info = { |
| .dst_sk = ovs_dp_get_net(dp)->genl_sock, |
| .snd_portid = upcall_info->portid, |
| }; |
| size_t len; |
| unsigned int hlen; |
| int err, dp_ifindex; |
| |
| dp_ifindex = get_dpifindex(dp); |
| if (!dp_ifindex) |
| return -ENODEV; |
| |
| if (skb_vlan_tag_present(skb)) { |
| nskb = skb_clone(skb, GFP_ATOMIC); |
| if (!nskb) |
| return -ENOMEM; |
| |
| nskb = __vlan_hwaccel_push_inside(nskb); |
| if (!nskb) |
| return -ENOMEM; |
| |
| skb = nskb; |
| } |
| |
| if (nla_attr_size(skb->len) > USHRT_MAX) { |
| err = -EFBIG; |
| goto out; |
| } |
| |
| /* Complete checksum if needed */ |
| if (skb->ip_summed == CHECKSUM_PARTIAL && |
| (err = skb_checksum_help(skb))) |
| goto out; |
| |
| /* Older versions of OVS user space enforce alignment of the last |
| * Netlink attribute to NLA_ALIGNTO which would require extensive |
| * padding logic. Only perform zerocopy if padding is not required. |
| */ |
| if (dp->user_features & OVS_DP_F_UNALIGNED) |
| hlen = skb_zerocopy_headlen(skb); |
| else |
| hlen = skb->len; |
| |
| len = upcall_msg_size(upcall_info, hlen); |
| user_skb = genlmsg_new_unicast(len, &info, 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; |
| |
| err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); |
| BUG_ON(err); |
| |
| if (upcall_info->userdata) |
| __nla_put(user_skb, OVS_PACKET_ATTR_USERDATA, |
| nla_len(upcall_info->userdata), |
| nla_data(upcall_info->userdata)); |
| |
| if (upcall_info->egress_tun_info) { |
| nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_EGRESS_TUN_KEY); |
| err = ovs_nla_put_tunnel_info(user_skb, |
| upcall_info->egress_tun_info); |
| BUG_ON(err); |
| nla_nest_end(user_skb, nla); |
| } |
| |
| if (upcall_info->actions_len) { |
| nla = nla_nest_start(user_skb, OVS_PACKET_ATTR_ACTIONS); |
| err = ovs_nla_put_actions(upcall_info->actions, |
| upcall_info->actions_len, |
| user_skb); |
| if (!err) |
| nla_nest_end(user_skb, nla); |
| else |
| nla_nest_cancel(user_skb, nla); |
| } |
| |
| /* Add OVS_PACKET_ATTR_MRU */ |
| if (upcall_info->mru) { |
| if (nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, |
| upcall_info->mru)) { |
| err = -ENOBUFS; |
| goto out; |
| } |
| pad_packet(dp, user_skb); |
| } |
| |
| /* Only reserve room for attribute header, packet data is added |
| * in skb_zerocopy() */ |
| if (!(nla = nla_reserve(user_skb, OVS_PACKET_ATTR_PACKET, 0))) { |
| err = -ENOBUFS; |
| goto out; |
| } |
| nla->nla_len = nla_attr_size(skb->len); |
| |
| err = skb_zerocopy(user_skb, skb, skb->len, hlen); |
| if (err) |
| goto out; |
| |
| /* Pad OVS_PACKET_ATTR_PACKET if linear copy was performed */ |
| pad_packet(dp, user_skb); |
| |
| ((struct nlmsghdr *) user_skb->data)->nlmsg_len = user_skb->len; |
| |
| err = genlmsg_unicast(ovs_dp_get_net(dp), user_skb, upcall_info->portid); |
| user_skb = NULL; |
| out: |
| if (err) |
| skb_tx_error(skb); |
| kfree_skb(user_skb); |
| kfree_skb(nskb); |
| return err; |
| } |
| |
| static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct ovs_header *ovs_header = info->userhdr; |
| struct net *net = sock_net(skb->sk); |
| struct nlattr **a = info->attrs; |
| struct sw_flow_actions *acts; |
| struct sk_buff *packet; |
| struct sw_flow *flow; |
| struct sw_flow_actions *sf_acts; |
| struct datapath *dp; |
| struct ethhdr *eth; |
| struct vport *input_vport; |
| u16 mru = 0; |
| int len; |
| int err; |
| bool log = !a[OVS_PACKET_ATTR_PROBE]; |
| |
| 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 (eth_proto_is_802_3(eth->h_proto)) |
| packet->protocol = eth->h_proto; |
| else |
| packet->protocol = htons(ETH_P_802_2); |
| |
| /* Set packet's mru */ |
| if (a[OVS_PACKET_ATTR_MRU]) { |
| mru = nla_get_u16(a[OVS_PACKET_ATTR_MRU]); |
| packet->ignore_df = 1; |
| } |
| OVS_CB(packet)->mru = mru; |
| |
| /* 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_key_extract_userspace(net, a[OVS_PACKET_ATTR_KEY], |
| packet, &flow->key, log); |
| if (err) |
| goto err_flow_free; |
| |
| err = ovs_nla_copy_actions(net, a[OVS_PACKET_ATTR_ACTIONS], |
| &flow->key, &acts, log); |
| if (err) |
| goto err_flow_free; |
| |
| rcu_assign_pointer(flow->sf_acts, acts); |
| packet->priority = flow->key.phy.priority; |
| packet->mark = flow->key.phy.skb_mark; |
| |
| rcu_read_lock(); |
| dp = get_dp_rcu(net, ovs_header->dp_ifindex); |
| err = -ENODEV; |
| if (!dp) |
| goto err_unlock; |
| |
| input_vport = ovs_vport_rcu(dp, flow->key.phy.in_port); |
| if (!input_vport) |
| input_vport = ovs_vport_rcu(dp, OVSP_LOCAL); |
| |
| if (!input_vport) |
| goto err_unlock; |
| |
| packet->dev = input_vport->dev; |
| OVS_CB(packet)->input_vport = input_vport; |
| sf_acts = rcu_dereference(flow->sf_acts); |
| |
| local_bh_disable(); |
| err = ovs_execute_actions(dp, packet, sf_acts, &flow->key); |
| 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 }, |
| [OVS_PACKET_ATTR_PROBE] = { .type = NLA_FLAG }, |
| [OVS_PACKET_ATTR_MRU] = { .type = NLA_U16 }, |
| }; |
| |
| static const 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 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, |
| .ops = dp_packet_genl_ops, |
| .n_ops = ARRAY_SIZE(dp_packet_genl_ops), |
| }; |
| |
| static void get_dp_stats(const struct datapath *dp, struct ovs_dp_stats *stats, |
| struct ovs_dp_megaflow_stats *mega_stats) |
| { |
| int i; |
| |
| memset(mega_stats, 0, sizeof(*mega_stats)); |
| |
| stats->n_flows = ovs_flow_tbl_count(&dp->table); |
| mega_stats->n_masks = ovs_flow_tbl_num_masks(&dp->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_irq(&percpu_stats->syncp); |
| local_stats = *percpu_stats; |
| } while (u64_stats_fetch_retry_irq(&percpu_stats->syncp, start)); |
| |
| stats->n_hit += local_stats.n_hit; |
| stats->n_missed += local_stats.n_missed; |
| stats->n_lost += local_stats.n_lost; |
| mega_stats->n_mask_hit += local_stats.n_mask_hit; |
| } |
| } |
| |
| static bool should_fill_key(const struct sw_flow_id *sfid, uint32_t ufid_flags) |
| { |
| return ovs_identifier_is_ufid(sfid) && |
| !(ufid_flags & OVS_UFID_F_OMIT_KEY); |
| } |
| |
| static bool should_fill_mask(uint32_t ufid_flags) |
| { |
| return !(ufid_flags & OVS_UFID_F_OMIT_MASK); |
| } |
| |
| static bool should_fill_actions(uint32_t ufid_flags) |
| { |
| return !(ufid_flags & OVS_UFID_F_OMIT_ACTIONS); |
| } |
| |
| static size_t ovs_flow_cmd_msg_size(const struct sw_flow_actions *acts, |
| const struct sw_flow_id *sfid, |
| uint32_t ufid_flags) |
| { |
| size_t len = NLMSG_ALIGN(sizeof(struct ovs_header)); |
| |
| /* OVS_FLOW_ATTR_UFID */ |
| if (sfid && ovs_identifier_is_ufid(sfid)) |
| len += nla_total_size(sfid->ufid_len); |
| |
| /* OVS_FLOW_ATTR_KEY */ |
| if (!sfid || should_fill_key(sfid, ufid_flags)) |
| len += nla_total_size(ovs_key_attr_size()); |
| |
| /* OVS_FLOW_ATTR_MASK */ |
| if (should_fill_mask(ufid_flags)) |
| len += nla_total_size(ovs_key_attr_size()); |
| |
| /* OVS_FLOW_ATTR_ACTIONS */ |
| if (should_fill_actions(ufid_flags)) |
| len += nla_total_size(acts->orig_len); |
| |
| return len |
| + 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 */ |
| } |
| |
| /* Called with ovs_mutex or RCU read lock. */ |
| static int ovs_flow_cmd_fill_stats(const struct sw_flow *flow, |
| struct sk_buff *skb) |
| { |
| struct ovs_flow_stats stats; |
| __be16 tcp_flags; |
| unsigned long used; |
| |
| ovs_flow_stats_get(flow, &stats, &used, &tcp_flags); |
| |
| if (used && |
| nla_put_u64(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used))) |
| return -EMSGSIZE; |
| |
| if (stats.n_packets && |
| nla_put(skb, OVS_FLOW_ATTR_STATS, sizeof(struct ovs_flow_stats), &stats)) |
| return -EMSGSIZE; |
| |
| if ((u8)ntohs(tcp_flags) && |
| nla_put_u8(skb, OVS_FLOW_ATTR_TCP_FLAGS, (u8)ntohs(tcp_flags))) |
| return -EMSGSIZE; |
| |
| return 0; |
| } |
| |
| /* Called with ovs_mutex or RCU read lock. */ |
| static int ovs_flow_cmd_fill_actions(const struct sw_flow *flow, |
| struct sk_buff *skb, int skb_orig_len) |
| { |
| struct nlattr *start; |
| int err; |
| |
| /* 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_ovsl(flow->sf_acts); |
| err = ovs_nla_put_actions(sf_acts->actions, |
| sf_acts->actions_len, skb); |
| |
| if (!err) |
| nla_nest_end(skb, start); |
| else { |
| if (skb_orig_len) |
| return err; |
| |
| nla_nest_cancel(skb, start); |
| } |
| } else if (skb_orig_len) { |
| return -EMSGSIZE; |
| } |
| |
| return 0; |
| } |
| |
| /* Called with ovs_mutex or RCU read lock. */ |
| static int ovs_flow_cmd_fill_info(const struct sw_flow *flow, int dp_ifindex, |
| struct sk_buff *skb, u32 portid, |
| u32 seq, u32 flags, u8 cmd, u32 ufid_flags) |
| { |
| const int skb_orig_len = skb->len; |
| struct ovs_header *ovs_header; |
| int err; |
| |
| ovs_header = genlmsg_put(skb, portid, seq, &dp_flow_genl_family, |
| flags, cmd); |
| if (!ovs_header) |
| return -EMSGSIZE; |
| |
| ovs_header->dp_ifindex = dp_ifindex; |
| |
| err = ovs_nla_put_identifier(flow, skb); |
| if (err) |
| goto error; |
| |
| if (should_fill_key(&flow->id, ufid_flags)) { |
| err = ovs_nla_put_masked_key(flow, skb); |
| if (err) |
| goto error; |
| } |
| |
| if (should_fill_mask(ufid_flags)) { |
| err = ovs_nla_put_mask(flow, skb); |
| if (err) |
| goto error; |
| } |
| |
| err = ovs_flow_cmd_fill_stats(flow, skb); |
| if (err) |
| goto error; |
| |
| if (should_fill_actions(ufid_flags)) { |
| err = ovs_flow_cmd_fill_actions(flow, skb, skb_orig_len); |
| if (err) |
| goto error; |
| } |
| |
| genlmsg_end(skb, ovs_header); |
| return 0; |
| |
| error: |
| genlmsg_cancel(skb, ovs_header); |
| return err; |
| } |
| |
| /* May not be called with RCU read lock. */ |
| static struct sk_buff *ovs_flow_cmd_alloc_info(const struct sw_flow_actions *acts, |
| const struct sw_flow_id *sfid, |
| struct genl_info *info, |
| bool always, |
| uint32_t ufid_flags) |
| { |
| struct sk_buff *skb; |
| size_t len; |
| |
| if (!always && !ovs_must_notify(&dp_flow_genl_family, info, 0)) |
| return NULL; |
| |
| len = ovs_flow_cmd_msg_size(acts, sfid, ufid_flags); |
| skb = genlmsg_new_unicast(len, info, GFP_KERNEL); |
| if (!skb) |
| return ERR_PTR(-ENOMEM); |
| |
| return skb; |
| } |
| |
| /* Called with ovs_mutex. */ |
| static struct sk_buff *ovs_flow_cmd_build_info(const struct sw_flow *flow, |
| int dp_ifindex, |
| struct genl_info *info, u8 cmd, |
| bool always, u32 ufid_flags) |
| { |
| struct sk_buff *skb; |
| int retval; |
| |
| skb = ovs_flow_cmd_alloc_info(ovsl_dereference(flow->sf_acts), |
| &flow->id, info, always, ufid_flags); |
| if (IS_ERR_OR_NULL(skb)) |
| return skb; |
| |
| retval = ovs_flow_cmd_fill_info(flow, dp_ifindex, skb, |
| info->snd_portid, info->snd_seq, 0, |
| cmd, ufid_flags); |
| BUG_ON(retval < 0); |
| return skb; |
| } |
| |
| static int ovs_flow_cmd_new(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sw_flow *flow = NULL, *new_flow; |
| struct sw_flow_mask mask; |
| struct sk_buff *reply; |
| struct datapath *dp; |
| struct sw_flow_key key; |
| struct sw_flow_actions *acts; |
| struct sw_flow_match match; |
| u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| int error; |
| bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| |
| /* Must have key and actions. */ |
| error = -EINVAL; |
| if (!a[OVS_FLOW_ATTR_KEY]) { |
| OVS_NLERR(log, "Flow key attr not present in new flow."); |
| goto error; |
| } |
| if (!a[OVS_FLOW_ATTR_ACTIONS]) { |
| OVS_NLERR(log, "Flow actions attr not present in new flow."); |
| goto error; |
| } |
| |
| /* Most of the time we need to allocate a new flow, do it before |
| * locking. |
| */ |
| new_flow = ovs_flow_alloc(); |
| if (IS_ERR(new_flow)) { |
| error = PTR_ERR(new_flow); |
| goto error; |
| } |
| |
| /* Extract key. */ |
| ovs_match_init(&match, &key, &mask); |
| error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| a[OVS_FLOW_ATTR_MASK], log); |
| if (error) |
| goto err_kfree_flow; |
| |
| ovs_flow_mask_key(&new_flow->key, &key, true, &mask); |
| |
| /* Extract flow identifier. */ |
| error = ovs_nla_get_identifier(&new_flow->id, a[OVS_FLOW_ATTR_UFID], |
| &key, log); |
| if (error) |
| goto err_kfree_flow; |
| |
| /* Validate actions. */ |
| error = ovs_nla_copy_actions(net, a[OVS_FLOW_ATTR_ACTIONS], |
| &new_flow->key, &acts, log); |
| if (error) { |
| OVS_NLERR(log, "Flow actions may not be safe on all matching packets."); |
| goto err_kfree_flow; |
| } |
| |
| reply = ovs_flow_cmd_alloc_info(acts, &new_flow->id, info, false, |
| ufid_flags); |
| if (IS_ERR(reply)) { |
| error = PTR_ERR(reply); |
| goto err_kfree_acts; |
| } |
| |
| ovs_lock(); |
| dp = get_dp(net, ovs_header->dp_ifindex); |
| if (unlikely(!dp)) { |
| error = -ENODEV; |
| goto err_unlock_ovs; |
| } |
| |
| /* Check if this is a duplicate flow */ |
| if (ovs_identifier_is_ufid(&new_flow->id)) |
| flow = ovs_flow_tbl_lookup_ufid(&dp->table, &new_flow->id); |
| if (!flow) |
| flow = ovs_flow_tbl_lookup(&dp->table, &key); |
| if (likely(!flow)) { |
| rcu_assign_pointer(new_flow->sf_acts, acts); |
| |
| /* Put flow in bucket. */ |
| error = ovs_flow_tbl_insert(&dp->table, new_flow, &mask); |
| if (unlikely(error)) { |
| acts = NULL; |
| goto err_unlock_ovs; |
| } |
| |
| if (unlikely(reply)) { |
| error = ovs_flow_cmd_fill_info(new_flow, |
| ovs_header->dp_ifindex, |
| reply, info->snd_portid, |
| info->snd_seq, 0, |
| OVS_FLOW_CMD_NEW, |
| ufid_flags); |
| BUG_ON(error < 0); |
| } |
| ovs_unlock(); |
| } else { |
| 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. |
| */ |
| if (unlikely(info->nlhdr->nlmsg_flags & (NLM_F_CREATE |
| | NLM_F_EXCL))) { |
| error = -EEXIST; |
| goto err_unlock_ovs; |
| } |
| /* The flow identifier has to be the same for flow updates. |
| * Look for any overlapping flow. |
| */ |
| if (unlikely(!ovs_flow_cmp(flow, &match))) { |
| if (ovs_identifier_is_key(&flow->id)) |
| flow = ovs_flow_tbl_lookup_exact(&dp->table, |
| &match); |
| else /* UFID matches but key is different */ |
| flow = NULL; |
| if (!flow) { |
| error = -ENOENT; |
| goto err_unlock_ovs; |
| } |
| } |
| /* Update actions. */ |
| old_acts = ovsl_dereference(flow->sf_acts); |
| rcu_assign_pointer(flow->sf_acts, acts); |
| |
| if (unlikely(reply)) { |
| error = ovs_flow_cmd_fill_info(flow, |
| ovs_header->dp_ifindex, |
| reply, info->snd_portid, |
| info->snd_seq, 0, |
| OVS_FLOW_CMD_NEW, |
| ufid_flags); |
| BUG_ON(error < 0); |
| } |
| ovs_unlock(); |
| |
| ovs_nla_free_flow_actions_rcu(old_acts); |
| ovs_flow_free(new_flow, false); |
| } |
| |
| if (reply) |
| ovs_notify(&dp_flow_genl_family, reply, info); |
| return 0; |
| |
| err_unlock_ovs: |
| ovs_unlock(); |
| kfree_skb(reply); |
| err_kfree_acts: |
| ovs_nla_free_flow_actions(acts); |
| err_kfree_flow: |
| ovs_flow_free(new_flow, false); |
| error: |
| return error; |
| } |
| |
| /* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ |
| static struct sw_flow_actions *get_flow_actions(struct net *net, |
| const struct nlattr *a, |
| const struct sw_flow_key *key, |
| const struct sw_flow_mask *mask, |
| bool log) |
| { |
| struct sw_flow_actions *acts; |
| struct sw_flow_key masked_key; |
| int error; |
| |
| ovs_flow_mask_key(&masked_key, key, true, mask); |
| error = ovs_nla_copy_actions(net, a, &masked_key, &acts, log); |
| if (error) { |
| OVS_NLERR(log, |
| "Actions may not be safe on all matching packets"); |
| return ERR_PTR(error); |
| } |
| |
| return acts; |
| } |
| |
| static int ovs_flow_cmd_set(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct net *net = sock_net(skb->sk); |
| struct nlattr **a = info->attrs; |
| struct ovs_header *ovs_header = info->userhdr; |
| struct sw_flow_key key; |
| struct sw_flow *flow; |
| struct sw_flow_mask mask; |
| struct sk_buff *reply = NULL; |
| struct datapath *dp; |
| struct sw_flow_actions *old_acts = NULL, *acts = NULL; |
| struct sw_flow_match match; |
| struct sw_flow_id sfid; |
| u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| int error; |
| bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| bool ufid_present; |
| |
| /* Extract key. */ |
| error = -EINVAL; |
| if (!a[OVS_FLOW_ATTR_KEY]) { |
| OVS_NLERR(log, "Flow key attribute not present in set flow."); |
| goto error; |
| } |
| |
| ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); |
| ovs_match_init(&match, &key, &mask); |
| error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| a[OVS_FLOW_ATTR_MASK], log); |
| if (error) |
| goto error; |
| |
| /* Validate actions. */ |
| if (a[OVS_FLOW_ATTR_ACTIONS]) { |
| acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], &key, |
| &mask, log); |
| if (IS_ERR(acts)) { |
| error = PTR_ERR(acts); |
| goto error; |
| } |
| |
| /* Can allocate before locking if have acts. */ |
| reply = ovs_flow_cmd_alloc_info(acts, &sfid, info, false, |
| ufid_flags); |
| if (IS_ERR(reply)) { |
| error = PTR_ERR(reply); |
| goto err_kfree_acts; |
| } |
| } |
| |
| ovs_lock(); |
| dp = get_dp(net, ovs_header->dp_ifindex); |
| if (unlikely(!dp)) { |
| error = -ENODEV; |
| goto err_unlock_ovs; |
| } |
| /* Check that the flow exists. */ |
| if (ufid_present) |
| flow = ovs_flow_tbl_lookup_ufid(&dp->table, &sfid); |
| else |
| flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| if (unlikely(!flow)) { |
| error = -ENOENT; |
| goto err_unlock_ovs; |
| } |
| |
| /* Update actions, if present. */ |
| if (likely(acts)) { |
| old_acts = ovsl_dereference(flow->sf_acts); |
| rcu_assign_pointer(flow->sf_acts, acts); |
| |
| if (unlikely(reply)) { |
| error = ovs_flow_cmd_fill_info(flow, |
| ovs_header->dp_ifindex, |
| reply, info->snd_portid, |
| info->snd_seq, 0, |
| OVS_FLOW_CMD_NEW, |
| ufid_flags); |
| BUG_ON(error < 0); |
| } |
| } else { |
| /* Could not alloc without acts before locking. */ |
| reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, |
| info, OVS_FLOW_CMD_NEW, false, |
| ufid_flags); |
| |
| if (IS_ERR(reply)) { |
| error = PTR_ERR(reply); |
| goto err_unlock_ovs; |
| } |
| } |
| |
| /* Clear stats. */ |
| if (a[OVS_FLOW_ATTR_CLEAR]) |
| ovs_flow_stats_clear(flow); |
| ovs_unlock(); |
| |
| if (reply) |
| ovs_notify(&dp_flow_genl_family, reply, info); |
| if (old_acts) |
| ovs_nla_free_flow_actions_rcu(old_acts); |
| |
| return 0; |
| |
| err_unlock_ovs: |
| ovs_unlock(); |
| kfree_skb(reply); |
| err_kfree_acts: |
| ovs_nla_free_flow_actions(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 net *net = sock_net(skb->sk); |
| struct sw_flow_key key; |
| struct sk_buff *reply; |
| struct sw_flow *flow; |
| struct datapath *dp; |
| struct sw_flow_match match; |
| struct sw_flow_id ufid; |
| u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| int err = 0; |
| bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| bool ufid_present; |
| |
| ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); |
| if (a[OVS_FLOW_ATTR_KEY]) { |
| ovs_match_init(&match, &key, NULL); |
| err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], NULL, |
| log); |
| } else if (!ufid_present) { |
| OVS_NLERR(log, |
| "Flow get message rejected, Key attribute missing."); |
| err = -EINVAL; |
| } |
| if (err) |
| return err; |
| |
| ovs_lock(); |
| dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| if (!dp) { |
| err = -ENODEV; |
| goto unlock; |
| } |
| |
| if (ufid_present) |
| flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); |
| else |
| flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| if (!flow) { |
| err = -ENOENT; |
| goto unlock; |
| } |
| |
| reply = ovs_flow_cmd_build_info(flow, ovs_header->dp_ifindex, info, |
| OVS_FLOW_CMD_NEW, true, ufid_flags); |
| 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 net *net = sock_net(skb->sk); |
| struct sw_flow_key key; |
| struct sk_buff *reply; |
| struct sw_flow *flow = NULL; |
| struct datapath *dp; |
| struct sw_flow_match match; |
| struct sw_flow_id ufid; |
| u32 ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| int err; |
| bool log = !a[OVS_FLOW_ATTR_PROBE]; |
| bool ufid_present; |
| |
| ufid_present = ovs_nla_get_ufid(&ufid, a[OVS_FLOW_ATTR_UFID], log); |
| if (a[OVS_FLOW_ATTR_KEY]) { |
| ovs_match_init(&match, &key, NULL); |
| err = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], |
| NULL, log); |
| if (unlikely(err)) |
| return err; |
| } |
| |
| ovs_lock(); |
| dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| if (unlikely(!dp)) { |
| err = -ENODEV; |
| goto unlock; |
| } |
| |
| if (unlikely(!a[OVS_FLOW_ATTR_KEY] && !ufid_present)) { |
| err = ovs_flow_tbl_flush(&dp->table); |
| goto unlock; |
| } |
| |
| if (ufid_present) |
| flow = ovs_flow_tbl_lookup_ufid(&dp->table, &ufid); |
| else |
| flow = ovs_flow_tbl_lookup_exact(&dp->table, &match); |
| if (unlikely(!flow)) { |
| err = -ENOENT; |
| goto unlock; |
| } |
| |
| ovs_flow_tbl_remove(&dp->table, flow); |
| ovs_unlock(); |
| |
| reply = ovs_flow_cmd_alloc_info((const struct sw_flow_actions __force *) flow->sf_acts, |
| &flow->id, info, false, ufid_flags); |
| if (likely(reply)) { |
| if (likely(!IS_ERR(reply))) { |
| rcu_read_lock(); /*To keep RCU checker happy. */ |
| err = ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, |
| reply, info->snd_portid, |
| info->snd_seq, 0, |
| OVS_FLOW_CMD_DEL, |
| ufid_flags); |
| rcu_read_unlock(); |
| BUG_ON(err < 0); |
| |
| ovs_notify(&dp_flow_genl_family, reply, info); |
| } else { |
| netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, PTR_ERR(reply)); |
| } |
| } |
| |
| ovs_flow_free(flow, true); |
| return 0; |
| unlock: |
| ovs_unlock(); |
| return err; |
| } |
| |
| static int ovs_flow_cmd_dump(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct nlattr *a[__OVS_FLOW_ATTR_MAX]; |
| struct ovs_header *ovs_header = genlmsg_data(nlmsg_data(cb->nlh)); |
| struct table_instance *ti; |
| struct datapath *dp; |
| u32 ufid_flags; |
| int err; |
| |
| err = genlmsg_parse(cb->nlh, &dp_flow_genl_family, a, |
| OVS_FLOW_ATTR_MAX, flow_policy); |
| if (err) |
| return err; |
| ufid_flags = ovs_nla_get_ufid_flags(a[OVS_FLOW_ATTR_UFID_FLAGS]); |
| |
| rcu_read_lock(); |
| dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); |
| if (!dp) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| |
| ti = rcu_dereference(dp->table.ti); |
| for (;;) { |
| struct sw_flow *flow; |
| u32 bucket, obj; |
| |
| bucket = cb->args[0]; |
| obj = cb->args[1]; |
| flow = ovs_flow_tbl_dump_next(ti, &bucket, &obj); |
| if (!flow) |
| break; |
| |
| if (ovs_flow_cmd_fill_info(flow, ovs_header->dp_ifindex, skb, |
| NETLINK_CB(cb->skb).portid, |
| cb->nlh->nlmsg_seq, NLM_F_MULTI, |
| OVS_FLOW_CMD_NEW, ufid_flags) < 0) |
| break; |
| |
| cb->args[0] = bucket; |
| cb->args[1] = obj; |
| } |
| rcu_read_unlock(); |
| return skb->len; |
| } |
| |
| static const struct nla_policy flow_policy[OVS_FLOW_ATTR_MAX + 1] = { |
| [OVS_FLOW_ATTR_KEY] = { .type = NLA_NESTED }, |
| [OVS_FLOW_ATTR_MASK] = { .type = NLA_NESTED }, |
| [OVS_FLOW_ATTR_ACTIONS] = { .type = NLA_NESTED }, |
| [OVS_FLOW_ATTR_CLEAR] = { .type = NLA_FLAG }, |
| [OVS_FLOW_ATTR_PROBE] = { .type = NLA_FLAG }, |
| [OVS_FLOW_ATTR_UFID] = { .type = NLA_UNSPEC, .len = 1 }, |
| [OVS_FLOW_ATTR_UFID_FLAGS] = { .type = NLA_U32 }, |
| }; |
| |
| static const 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 |
| }, |
| { .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_set, |
| }, |
| }; |
| |
| 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, |
| .ops = dp_flow_genl_ops, |
| .n_ops = ARRAY_SIZE(dp_flow_genl_ops), |
| .mcgrps = &ovs_dp_flow_multicast_group, |
| .n_mcgrps = 1, |
| }; |
| |
| 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)); |
| msgsize += nla_total_size(sizeof(struct ovs_dp_megaflow_stats)); |
| msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ |
| |
| return msgsize; |
| } |
| |
| /* Called with ovs_mutex. */ |
| 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; |
| struct ovs_dp_megaflow_stats dp_megaflow_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); |
| |
| err = nla_put_string(skb, OVS_DP_ATTR_NAME, ovs_dp_name(dp)); |
| if (err) |
| goto nla_put_failure; |
| |
| get_dp_stats(dp, &dp_stats, &dp_megaflow_stats); |
| if (nla_put(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), |
| &dp_stats)) |
| goto nla_put_failure; |
| |
| if (nla_put(skb, OVS_DP_ATTR_MEGAFLOW_STATS, |
| sizeof(struct ovs_dp_megaflow_stats), |
| &dp_megaflow_stats)) |
| goto nla_put_failure; |
| |
| if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) |
| goto nla_put_failure; |
| |
| genlmsg_end(skb, ovs_header); |
| return 0; |
| |
| nla_put_failure: |
| genlmsg_cancel(skb, ovs_header); |
| error: |
| return -EMSGSIZE; |
| } |
| |
| static struct sk_buff *ovs_dp_cmd_alloc_info(struct genl_info *info) |
| { |
| return genlmsg_new_unicast(ovs_dp_cmd_msg_size(), info, GFP_KERNEL); |
| } |
| |
| /* Called with rcu_read_lock or ovs_mutex. */ |
| static struct datapath *lookup_datapath(struct net *net, |
| const 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; |
| |
| vport = ovs_vport_locate(net, nla_data(a[OVS_DP_ATTR_NAME])); |
| dp = vport && vport->port_no == OVSP_LOCAL ? vport->dp : NULL; |
| } |
| return dp ? dp : ERR_PTR(-ENODEV); |
| } |
| |
| static void ovs_dp_reset_user_features(struct sk_buff *skb, struct genl_info *info) |
| { |
| struct datapath *dp; |
| |
| dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| if (IS_ERR(dp)) |
| return; |
| |
| WARN(dp->user_features, "Dropping previously announced user features\n"); |
| dp->user_features = 0; |
| } |
| |
| static void ovs_dp_change(struct datapath *dp, struct nlattr *a[]) |
| { |
| if (a[OVS_DP_ATTR_USER_FEATURES]) |
| dp->user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); |
| } |
| |
| 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; |
| |
| reply = ovs_dp_cmd_alloc_info(info); |
| if (!reply) |
| return -ENOMEM; |
| |
| err = -ENOMEM; |
| dp = kzalloc(sizeof(*dp), GFP_KERNEL); |
| if (dp == NULL) |
| goto err_free_reply; |
| |
| ovs_dp_set_net(dp, sock_net(skb->sk)); |
| |
| /* Allocate table. */ |
| err = ovs_flow_tbl_init(&dp->table); |
| if (err) |
| goto err_free_dp; |
| |
| dp->stats_percpu = netdev_alloc_pcpu_stats(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_portids = a[OVS_DP_ATTR_UPCALL_PID]; |
| |
| ovs_dp_change(dp, a); |
| |
| /* So far only local changes have been made, now need the lock. */ |
| ovs_lock(); |
| |
| vport = new_vport(&parms); |
| if (IS_ERR(vport)) { |
| err = PTR_ERR(vport); |
| if (err == -EBUSY) |
| err = -EEXIST; |
| |
| if (err == -EEXIST) { |
| /* An outdated user space instance that does not understand |
| * the concept of user_features has attempted to create a new |
| * datapath and is likely to reuse it. Drop all user features. |
| */ |
| if (info->genlhdr->version < OVS_DP_VER_FEATURES) |
| ovs_dp_reset_user_features(skb, info); |
| } |
| |
| goto err_destroy_ports_array; |
| } |
| |
| err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_DP_CMD_NEW); |
| BUG_ON(err < 0); |
| |
| 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(&dp_datapath_genl_family, reply, info); |
| return 0; |
| |
| err_destroy_ports_array: |
| ovs_unlock(); |
| kfree(dp->ports); |
| err_destroy_percpu: |
| free_percpu(dp->stats_percpu); |
| err_destroy_table: |
| ovs_flow_tbl_destroy(&dp->table); |
| err_free_dp: |
| kfree(dp); |
| err_free_reply: |
| kfree_skb(reply); |
| 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 ports in datapath are destroyed first before freeing datapath. |
| */ |
| ovs_dp_detach_port(ovs_vport_ovsl(dp, OVSP_LOCAL)); |
| |
| /* RCU destroy the flow table */ |
| 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; |
| |
| reply = ovs_dp_cmd_alloc_info(info); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| err = PTR_ERR(dp); |
| if (IS_ERR(dp)) |
| goto err_unlock_free; |
| |
| err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_DP_CMD_DEL); |
| BUG_ON(err < 0); |
| |
| __dp_destroy(dp); |
| ovs_unlock(); |
| |
| ovs_notify(&dp_datapath_genl_family, reply, info); |
| |
| return 0; |
| |
| err_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| reply = ovs_dp_cmd_alloc_info(info); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| err = PTR_ERR(dp); |
| if (IS_ERR(dp)) |
| goto err_unlock_free; |
| |
| ovs_dp_change(dp, info->attrs); |
| |
| err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_DP_CMD_NEW); |
| BUG_ON(err < 0); |
| |
| ovs_unlock(); |
| ovs_notify(&dp_datapath_genl_family, reply, info); |
| |
| return 0; |
| |
| err_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| reply = ovs_dp_cmd_alloc_info(info); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| dp = lookup_datapath(sock_net(skb->sk), info->userhdr, info->attrs); |
| if (IS_ERR(dp)) { |
| err = PTR_ERR(dp); |
| goto err_unlock_free; |
| } |
| err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_DP_CMD_NEW); |
| BUG_ON(err < 0); |
| ovs_unlock(); |
| |
| return genlmsg_reply(reply, info); |
| |
| err_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| ovs_lock(); |
| list_for_each_entry(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++; |
| } |
| ovs_unlock(); |
| |
| cb->args[0] = i; |
| |
| return skb->len; |
| } |
| |
| 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 }, |
| [OVS_DP_ATTR_USER_FEATURES] = { .type = NLA_U32 }, |
| }; |
| |
| static const 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 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, |
| .ops = dp_datapath_genl_ops, |
| .n_ops = ARRAY_SIZE(dp_datapath_genl_ops), |
| .mcgrps = &ovs_dp_datapath_multicast_group, |
| .n_mcgrps = 1, |
| }; |
| |
| /* 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, |
| ovs_vport_name(vport))) |
| 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; |
| |
| if (ovs_vport_get_upcall_portids(vport, skb)) |
| goto nla_put_failure; |
| |
| err = ovs_vport_get_options(vport, skb); |
| if (err == -EMSGSIZE) |
| goto error; |
| |
| genlmsg_end(skb, ovs_header); |
| return 0; |
| |
| nla_put_failure: |
| err = -EMSGSIZE; |
| error: |
| genlmsg_cancel(skb, ovs_header); |
| return err; |
| } |
| |
| static struct sk_buff *ovs_vport_cmd_alloc_info(void) |
| { |
| return nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| } |
| |
| /* Called with ovs_mutex, only via ovs_dp_notify_wq(). */ |
| 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, |
| const 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; |
| |
| if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || |
| !a[OVS_VPORT_ATTR_UPCALL_PID]) |
| return -EINVAL; |
| |
| port_no = a[OVS_VPORT_ATTR_PORT_NO] |
| ? nla_get_u32(a[OVS_VPORT_ATTR_PORT_NO]) : 0; |
| if (port_no >= DP_MAX_PORTS) |
| return -EFBIG; |
| |
| reply = ovs_vport_cmd_alloc_info(); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| restart: |
| dp = get_dp(sock_net(skb->sk), ovs_header->dp_ifindex); |
| err = -ENODEV; |
| if (!dp) |
| goto exit_unlock_free; |
| |
| if (port_no) { |
| vport = ovs_vport_ovsl(dp, port_no); |
| err = -EBUSY; |
| if (vport) |
| goto exit_unlock_free; |
| } else { |
| for (port_no = 1; ; port_no++) { |
| if (port_no >= DP_MAX_PORTS) { |
| err = -EFBIG; |
| goto exit_unlock_free; |
| } |
| 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_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; |
| |
| vport = new_vport(&parms); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) { |
| if (err == -EAGAIN) |
| goto restart; |
| goto exit_unlock_free; |
| } |
| |
| 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(&dp_vport_genl_family, reply, info); |
| return 0; |
| |
| exit_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| reply = ovs_vport_cmd_alloc_info(); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock_free; |
| |
| if (a[OVS_VPORT_ATTR_TYPE] && |
| nla_get_u32(a[OVS_VPORT_ATTR_TYPE]) != vport->ops->type) { |
| err = -EINVAL; |
| goto exit_unlock_free; |
| } |
| |
| if (a[OVS_VPORT_ATTR_OPTIONS]) { |
| err = ovs_vport_set_options(vport, a[OVS_VPORT_ATTR_OPTIONS]); |
| if (err) |
| goto exit_unlock_free; |
| } |
| |
| |
| if (a[OVS_VPORT_ATTR_UPCALL_PID]) { |
| struct nlattr *ids = a[OVS_VPORT_ATTR_UPCALL_PID]; |
| |
| err = ovs_vport_set_upcall_portids(vport, ids); |
| if (err) |
| goto exit_unlock_free; |
| } |
| |
| 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(&dp_vport_genl_family, reply, info); |
| return 0; |
| |
| exit_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| reply = ovs_vport_cmd_alloc_info(); |
| if (!reply) |
| return -ENOMEM; |
| |
| ovs_lock(); |
| vport = lookup_vport(sock_net(skb->sk), info->userhdr, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock_free; |
| |
| if (vport->port_no == OVSP_LOCAL) { |
| err = -EINVAL; |
| goto exit_unlock_free; |
| } |
| |
| err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_VPORT_CMD_DEL); |
| BUG_ON(err < 0); |
| ovs_dp_detach_port(vport); |
| ovs_unlock(); |
| |
| ovs_notify(&dp_vport_genl_family, reply, info); |
| return 0; |
| |
| exit_unlock_free: |
| ovs_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| reply = ovs_vport_cmd_alloc_info(); |
| if (!reply) |
| return -ENOMEM; |
| |
| rcu_read_lock(); |
| vport = lookup_vport(sock_net(skb->sk), ovs_header, a); |
| err = PTR_ERR(vport); |
| if (IS_ERR(vport)) |
| goto exit_unlock_free; |
| err = ovs_vport_cmd_fill_info(vport, reply, info->snd_portid, |
| info->snd_seq, 0, OVS_VPORT_CMD_NEW); |
| BUG_ON(err < 0); |
| rcu_read_unlock(); |
| |
| return genlmsg_reply(reply, info); |
| |
| exit_unlock_free: |
| rcu_read_unlock(); |
| kfree_skb(reply); |
| 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; |
| |
| rcu_read_lock(); |
| dp = get_dp_rcu(sock_net(skb->sk), ovs_header->dp_ifindex); |
| if (!dp) { |
| rcu_read_unlock(); |
| return -ENODEV; |
| } |
| 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 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 const 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 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, |
| .ops = dp_vport_genl_ops, |
| .n_ops = ARRAY_SIZE(dp_vport_genl_ops), |
| .mcgrps = &ovs_dp_vport_multicast_group, |
| .n_mcgrps = 1, |
| }; |
| |
| static struct genl_family * const dp_genl_families[] = { |
| &dp_datapath_genl_family, |
| &dp_vport_genl_family, |
| &dp_flow_genl_family, |
| &dp_packet_genl_family, |
| }; |
| |
| static void dp_unregister_genl(int n_families) |
| { |
| int i; |
| |
| for (i = 0; i < n_families; i++) |
| genl_unregister_family(dp_genl_families[i]); |
| } |
| |
| static int dp_register_genl(void) |
| { |
| int err; |
| int i; |
| |
| for (i = 0; i < ARRAY_SIZE(dp_genl_families); i++) { |
| |
| err = genl_register_family(dp_genl_families[i]); |
| if (err) |
| goto error; |
| } |
| |
| return 0; |
| |
| error: |
| dp_unregister_genl(i); |
| return err; |
| } |
| |
| 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); |
| ovs_ct_init(net); |
| return 0; |
| } |
| |
| static void __net_exit list_vports_from_net(struct net *net, struct net *dnet, |
| struct list_head *head) |
| { |
| struct ovs_net *ovs_net = net_generic(net, ovs_net_id); |
| struct datapath *dp; |
| |
| list_for_each_entry(dp, &ovs_net->dps, list_node) { |
| int i; |
| |
| for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { |
| struct vport *vport; |
| |
| hlist_for_each_entry(vport, &dp->ports[i], dp_hash_node) { |
| if (vport->ops->type != OVS_VPORT_TYPE_INTERNAL) |
| continue; |
| |
| if (dev_net(vport->dev) == dnet) |
| list_add(&vport->detach_list, head); |
| } |
| } |
| } |
| } |
| |
| static void __net_exit ovs_exit_net(struct net *dnet) |
| { |
| struct datapath *dp, *dp_next; |
| struct ovs_net *ovs_net = net_generic(dnet, ovs_net_id); |
| struct vport *vport, *vport_next; |
| struct net *net; |
| LIST_HEAD(head); |
| |
| ovs_ct_exit(dnet); |
| ovs_lock(); |
| list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) |
| __dp_destroy(dp); |
| |
| rtnl_lock(); |
| for_each_net(net) |
| list_vports_from_net(net, dnet, &head); |
| rtnl_unlock(); |
| |
| /* Detach all vports from given namespace. */ |
| list_for_each_entry_safe(vport, vport_next, &head, detach_list) { |
| list_del(&vport->detach_list); |
| ovs_dp_detach_port(vport); |
| } |
| |
| 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 = action_fifos_init(); |
| if (err) |
| goto error; |
| |
| err = ovs_internal_dev_rtnl_link_register(); |
| if (err) |
| goto error_action_fifos_exit; |
| |
| err = ovs_flow_init(); |
| if (err) |
| goto error_unreg_rtnl_link; |
| |
| 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 = ovs_netdev_init(); |
| if (err) |
| goto error_unreg_notifier; |
| |
| err = dp_register_genl(); |
| if (err < 0) |
| goto error_unreg_netdev; |
| |
| return 0; |
| |
| error_unreg_netdev: |
| ovs_netdev_exit(); |
| 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_unreg_rtnl_link: |
| ovs_internal_dev_rtnl_link_unregister(); |
| error_action_fifos_exit: |
| action_fifos_exit(); |
| error: |
| return err; |
| } |
| |
| static void dp_cleanup(void) |
| { |
| dp_unregister_genl(ARRAY_SIZE(dp_genl_families)); |
| ovs_netdev_exit(); |
| unregister_netdevice_notifier(&ovs_dp_device_notifier); |
| unregister_pernet_device(&ovs_net_ops); |
| rcu_barrier(); |
| ovs_vport_exit(); |
| ovs_flow_exit(); |
| ovs_internal_dev_rtnl_link_unregister(); |
| action_fifos_exit(); |
| } |
| |
| module_init(dp_init); |
| module_exit(dp_cleanup); |
| |
| MODULE_DESCRIPTION("Open vSwitch switching datapath"); |
| MODULE_LICENSE("GPL"); |