diff options
Diffstat (limited to 'net/openvswitch/datapath.c')
| -rw-r--r-- | net/openvswitch/datapath.c | 2808 |
1 files changed, 2808 insertions, 0 deletions
diff --git a/net/openvswitch/datapath.c b/net/openvswitch/datapath.c new file mode 100644 index 000000000..11c69415c --- /dev/null +++ b/net/openvswitch/datapath.c @@ -0,0 +1,2808 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Copyright (c) 2007-2014 Nicira, Inc. + */ + +#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/gso.h> +#include <net/net_namespace.h> +#include <net/netns/generic.h> +#include <net/pkt_cls.h> + +#include "datapath.h" +#include "drop.h" +#include "flow.h" +#include "flow_table.h" +#include "flow_netlink.h" +#include "meter.h" +#include "openvswitch_trace.h" +#include "vport-internal_dev.h" +#include "vport-netdev.h" + +unsigned int ovs_net_id __read_mostly; + +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; +} +#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 *, + uint32_t cutlen); +static int queue_userspace_packet(struct datapath *dp, struct sk_buff *, + const struct sw_flow_key *, + const struct dp_upcall_info *, + uint32_t cutlen); + +static void ovs_dp_masks_rebalance(struct work_struct *work); + +static int ovs_dp_set_upcall_portids(struct datapath *, const struct nlattr *); + +/* 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); + ovs_meters_exit(dp); + kfree(rcu_dereference_raw(dp->upcall_portids)); + 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, + lockdep_ovsl_is_held()) { + 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; +} + +static void ovs_vport_update_upcall_stats(struct sk_buff *skb, + const struct dp_upcall_info *upcall_info, + bool upcall_result) +{ + struct vport *p = OVS_CB(skb)->input_vport; + struct vport_upcall_stats_percpu *stats; + + if (upcall_info->cmd != OVS_PACKET_CMD_MISS && + upcall_info->cmd != OVS_PACKET_CMD_ACTION) + return; + + stats = this_cpu_ptr(p->upcall_stats); + u64_stats_update_begin(&stats->syncp); + if (upcall_result) + u64_stats_inc(&stats->n_success); + else + u64_stats_inc(&stats->n_fail); + u64_stats_update_end(&stats->syncp); +} + +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; + u32 n_cache_hit; + int error; + + stats = this_cpu_ptr(dp->stats_percpu); + + /* Look up flow. */ + flow = ovs_flow_tbl_lookup_stats(&dp->table, key, skb_get_hash(skb), + &n_mask_hit, &n_cache_hit); + if (unlikely(!flow)) { + struct dp_upcall_info upcall; + + memset(&upcall, 0, sizeof(upcall)); + upcall.cmd = OVS_PACKET_CMD_MISS; + + if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU) + upcall.portid = + ovs_dp_get_upcall_portid(dp, smp_processor_id()); + else + upcall.portid = ovs_vport_find_upcall_portid(p, skb); + + upcall.mru = OVS_CB(skb)->mru; + error = ovs_dp_upcall(dp, skb, key, &upcall, 0); + switch (error) { + case 0: + case -EAGAIN: + case -ERESTARTSYS: + case -EINTR: + consume_skb(skb); + break; + default: + kfree_skb(skb); + break; + } + stats_counter = &stats->n_missed; + goto out; + } + + ovs_flow_stats_update(flow, key->tp.flags, skb); + sf_acts = rcu_dereference(flow->sf_acts); + error = ovs_execute_actions(dp, skb, sf_acts, key); + if (unlikely(error)) + net_dbg_ratelimited("ovs: action execution error on datapath %s: %d\n", + ovs_dp_name(dp), error); + + stats_counter = &stats->n_hit; + +out: + /* Update datapath statistics. */ + u64_stats_update_begin(&stats->syncp); + (*stats_counter)++; + stats->n_mask_hit += n_mask_hit; + stats->n_cache_hit += n_cache_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, + uint32_t cutlen) +{ + struct dp_stats_percpu *stats; + int err; + + if (trace_ovs_dp_upcall_enabled()) + trace_ovs_dp_upcall(dp, skb, key, upcall_info); + + if (upcall_info->portid == 0) { + err = -ENOTCONN; + goto err; + } + + if (!skb_is_gso(skb)) + err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); + else + err = queue_gso_packets(dp, skb, key, upcall_info, cutlen); + + ovs_vport_update_upcall_stats(skb, upcall_info, !err); + 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, + uint32_t cutlen) +{ + unsigned int gso_type = skb_shinfo(skb)->gso_type; + struct sw_flow_key later_key; + struct sk_buff *segs, *nskb; + int err; + + BUILD_BUG_ON(sizeof(*OVS_CB(skb)) > SKB_GSO_CB_OFFSET); + segs = __skb_gso_segment(skb, NETIF_F_SG, false); + 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_list_walk_safe(segs, skb, nskb) { + if (gso_type & SKB_GSO_UDP && skb != segs) + key = &later_key; + + err = queue_userspace_packet(dp, skb, key, upcall_info, cutlen); + if (err) + break; + + } + + /* Free all of the segments. */ + skb_list_walk_safe(segs, skb, nskb) { + if (err) + kfree_skb(skb); + else + consume_skb(skb); + } + return err; +} + +static size_t upcall_msg_size(const struct dp_upcall_info *upcall_info, + unsigned int hdrlen, int actions_attrlen) +{ + 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 */ + + nla_total_size(sizeof(unsigned int)) /* OVS_PACKET_ATTR_LEN */ + + nla_total_size(sizeof(u64)); /* OVS_PACKET_ATTR_HASH */ + + /* 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(actions_attrlen); + + /* 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) + skb_put_zero(skb, 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, + uint32_t cutlen) +{ + struct ovs_header *upcall; + struct sk_buff *nskb = NULL; + struct sk_buff *user_skb = NULL; /* to be queued to userspace */ + struct nlattr *nla; + size_t len; + unsigned int hlen; + int err, dp_ifindex; + u64 hash; + + 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_csum_hwoffload_help(skb, 0))) + 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 - cutlen, + OVS_CB(skb)->acts_origlen); + user_skb = genlmsg_new(len, GFP_ATOMIC); + if (!user_skb) { + err = -ENOMEM; + goto out; + } + + upcall = genlmsg_put(user_skb, 0, 0, &dp_packet_genl_family, + 0, upcall_info->cmd); + if (!upcall) { + err = -EINVAL; + goto out; + } + upcall->dp_ifindex = dp_ifindex; + + err = ovs_nla_put_key(key, key, OVS_PACKET_ATTR_KEY, false, user_skb); + if (err) + goto out; + + 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_noflag(user_skb, + OVS_PACKET_ATTR_EGRESS_TUN_KEY); + if (!nla) { + err = -EMSGSIZE; + goto out; + } + err = ovs_nla_put_tunnel_info(user_skb, + upcall_info->egress_tun_info); + if (err) + goto out; + + nla_nest_end(user_skb, nla); + } + + if (upcall_info->actions_len) { + nla = nla_nest_start_noflag(user_skb, OVS_PACKET_ATTR_ACTIONS); + if (!nla) { + err = -EMSGSIZE; + goto out; + } + 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 && + nla_put_u16(user_skb, OVS_PACKET_ATTR_MRU, upcall_info->mru)) { + err = -ENOBUFS; + goto out; + } + + /* Add OVS_PACKET_ATTR_LEN when packet is truncated */ + if (cutlen > 0 && + nla_put_u32(user_skb, OVS_PACKET_ATTR_LEN, skb->len)) { + err = -ENOBUFS; + goto out; + } + + /* Add OVS_PACKET_ATTR_HASH */ + hash = skb_get_hash_raw(skb); + if (skb->sw_hash) + hash |= OVS_PACKET_HASH_SW_BIT; + + if (skb->l4_hash) + hash |= OVS_PACKET_HASH_L4_BIT; + + if (nla_put(user_skb, OVS_PACKET_ATTR_HASH, sizeof (u64), &hash)) { + err = -ENOBUFS; + goto out; + } + + /* 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 - cutlen); + + err = skb_zerocopy(user_skb, skb, skb->len - cutlen, 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); + consume_skb(user_skb); + consume_skb(nskb); + + return err; +} + +static int ovs_packet_cmd_execute(struct sk_buff *skb, struct genl_info *info) +{ + struct ovs_header *ovs_header = genl_info_userhdr(info); + 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 vport *input_vport; + u16 mru = 0; + u64 hash; + 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); + + /* 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; + + if (a[OVS_PACKET_ATTR_HASH]) { + hash = nla_get_u64(a[OVS_PACKET_ATTR_HASH]); + + __skb_set_hash(packet, hash & 0xFFFFFFFFULL, + !!(hash & OVS_PACKET_HASH_SW_BIT), + !!(hash & OVS_PACKET_HASH_L4_BIT)); + } + + /* 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 }, + [OVS_PACKET_ATTR_HASH] = { .type = NLA_U64 }, +}; + +static const struct genl_small_ops dp_packet_genl_ops[] = { + { .cmd = OVS_PACKET_CMD_EXECUTE, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_packet_cmd_execute + } +}; + +static struct genl_family dp_packet_genl_family __ro_after_init = { + .hdrsize = sizeof(struct ovs_header), + .name = OVS_PACKET_FAMILY, + .version = OVS_PACKET_VERSION, + .maxattr = OVS_PACKET_ATTR_MAX, + .policy = packet_policy, + .netnsok = true, + .parallel_ops = true, + .small_ops = dp_packet_genl_ops, + .n_small_ops = ARRAY_SIZE(dp_packet_genl_ops), + .resv_start_op = OVS_PACKET_CMD_EXECUTE + 1, + .module = THIS_MODULE, +}; + +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(&percpu_stats->syncp); + local_stats = *percpu_stats; + } while (u64_stats_fetch_retry(&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; + mega_stats->n_cache_hit += local_stats.n_cache_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, or unmasked flow key as fallback + * see ovs_nla_put_identifier() + */ + if (sfid && ovs_identifier_is_ufid(sfid)) + len += nla_total_size(sfid->ufid_len); + else + len += nla_total_size(ovs_key_attr_size()); + + /* 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_64bit(sizeof(struct ovs_flow_stats)) /* OVS_FLOW_ATTR_STATS */ + + nla_total_size(1) /* OVS_FLOW_ATTR_TCP_FLAGS */ + + nla_total_size_64bit(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_64bit(skb, OVS_FLOW_ATTR_USED, ovs_flow_used_time(used), + OVS_FLOW_ATTR_PAD)) + return -EMSGSIZE; + + if (stats.n_packets && + nla_put_64bit(skb, OVS_FLOW_ATTR_STATS, + sizeof(struct ovs_flow_stats), &stats, + OVS_FLOW_ATTR_PAD)) + 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_noflag(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(len, 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); + if (WARN_ON_ONCE(retval < 0)) { + kfree_skb(skb); + skb = ERR_PTR(retval); + } + 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 = genl_info_userhdr(info); + 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. */ + key = kzalloc(sizeof(*key), GFP_KERNEL); + if (!key) { + error = -ENOMEM; + goto err_kfree_flow; + } + + ovs_match_init(&match, key, false, &mask); + error = ovs_nla_get_match(net, &match, a[OVS_FLOW_ATTR_KEY], + a[OVS_FLOW_ATTR_MASK], log); + if (error) + goto err_kfree_key; + + 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_key; + + /* 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_key; + } + + 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); + + kfree(key); + return 0; + +err_unlock_ovs: + ovs_unlock(); + kfree_skb(reply); +err_kfree_acts: + ovs_nla_free_flow_actions(acts); +err_kfree_key: + kfree(key); +err_kfree_flow: + ovs_flow_free(new_flow, false); +error: + return error; +} + +/* Factor out action copy to avoid "Wframe-larger-than=1024" warning. */ +static noinline_for_stack +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; +} + +/* Factor out match-init and action-copy to avoid + * "Wframe-larger-than=1024" warning. Because mask is only + * used to get actions, we new a function to save some + * stack space. + * + * If there are not key and action attrs, we return 0 + * directly. In the case, the caller will also not use the + * match as before. If there is action attr, we try to get + * actions and save them to *acts. Before returning from + * the function, we reset the match->mask pointer. Because + * we should not to return match object with dangling reference + * to mask. + * */ +static noinline_for_stack int +ovs_nla_init_match_and_action(struct net *net, + struct sw_flow_match *match, + struct sw_flow_key *key, + struct nlattr **a, + struct sw_flow_actions **acts, + bool log) +{ + struct sw_flow_mask mask; + int error = 0; + + if (a[OVS_FLOW_ATTR_KEY]) { + ovs_match_init(match, key, true, &mask); + error = ovs_nla_get_match(net, match, a[OVS_FLOW_ATTR_KEY], + a[OVS_FLOW_ATTR_MASK], log); + if (error) + goto error; + } + + if (a[OVS_FLOW_ATTR_ACTIONS]) { + if (!a[OVS_FLOW_ATTR_KEY]) { + OVS_NLERR(log, + "Flow key attribute not present in set flow."); + error = -EINVAL; + goto error; + } + + *acts = get_flow_actions(net, a[OVS_FLOW_ATTR_ACTIONS], key, + &mask, log); + if (IS_ERR(*acts)) { + error = PTR_ERR(*acts); + goto error; + } + } + + /* On success, error is 0. */ +error: + match->mask = NULL; + return error; +} + +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 = genl_info_userhdr(info); + struct sw_flow_key key; + struct sw_flow *flow; + 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 = 0; + bool log = !a[OVS_FLOW_ATTR_PROBE]; + bool ufid_present; + + ufid_present = ovs_nla_get_ufid(&sfid, a[OVS_FLOW_ATTR_UFID], log); + if (!a[OVS_FLOW_ATTR_KEY] && !ufid_present) { + OVS_NLERR(log, + "Flow set message rejected, Key attribute missing."); + return -EINVAL; + } + + error = ovs_nla_init_match_and_action(net, &match, &key, a, + &acts, log); + if (error) + goto error; + + if (acts) { + /* 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_SET, + 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_SET, 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 = genl_info_userhdr(info); + 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, true, 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_GET, 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 = genl_info_userhdr(info); + 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, true, 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 (!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(); + if (WARN_ON_ONCE(err < 0)) { + kfree_skb(reply); + goto out_free; + } + + ovs_notify(&dp_flow_genl_family, reply, info); + } else { + netlink_set_err(sock_net(skb->sk)->genl_sock, 0, 0, + PTR_ERR(reply)); + } + } + +out_free: + 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_deprecated(cb->nlh, &dp_flow_genl_family, a, + OVS_FLOW_ATTR_MAX, flow_policy, NULL); + 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_GET, 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_small_ops dp_flow_genl_ops[] = { + { .cmd = OVS_FLOW_CMD_NEW, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_flow_cmd_new + }, + { .cmd = OVS_FLOW_CMD_DEL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_flow_cmd_del + }, + { .cmd = OVS_FLOW_CMD_GET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = 0, /* OK for unprivileged users. */ + .doit = ovs_flow_cmd_get, + .dumpit = ovs_flow_cmd_dump + }, + { .cmd = OVS_FLOW_CMD_SET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_flow_cmd_set, + }, +}; + +static struct genl_family dp_flow_genl_family __ro_after_init = { + .hdrsize = sizeof(struct ovs_header), + .name = OVS_FLOW_FAMILY, + .version = OVS_FLOW_VERSION, + .maxattr = OVS_FLOW_ATTR_MAX, + .policy = flow_policy, + .netnsok = true, + .parallel_ops = true, + .small_ops = dp_flow_genl_ops, + .n_small_ops = ARRAY_SIZE(dp_flow_genl_ops), + .resv_start_op = OVS_FLOW_CMD_SET + 1, + .mcgrps = &ovs_dp_flow_multicast_group, + .n_mcgrps = 1, + .module = THIS_MODULE, +}; + +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_64bit(sizeof(struct ovs_dp_stats)); + msgsize += nla_total_size_64bit(sizeof(struct ovs_dp_megaflow_stats)); + msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_USER_FEATURES */ + msgsize += nla_total_size(sizeof(u32)); /* OVS_DP_ATTR_MASKS_CACHE_SIZE */ + msgsize += nla_total_size(sizeof(u32) * nr_cpu_ids); /* OVS_DP_ATTR_PER_CPU_PIDS */ + + 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; + struct dp_nlsk_pids *pids = ovsl_dereference(dp->upcall_portids); + int err, pids_len; + + 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_64bit(skb, OVS_DP_ATTR_STATS, sizeof(struct ovs_dp_stats), + &dp_stats, OVS_DP_ATTR_PAD)) + goto nla_put_failure; + + if (nla_put_64bit(skb, OVS_DP_ATTR_MEGAFLOW_STATS, + sizeof(struct ovs_dp_megaflow_stats), + &dp_megaflow_stats, OVS_DP_ATTR_PAD)) + goto nla_put_failure; + + if (nla_put_u32(skb, OVS_DP_ATTR_USER_FEATURES, dp->user_features)) + goto nla_put_failure; + + if (nla_put_u32(skb, OVS_DP_ATTR_MASKS_CACHE_SIZE, + ovs_flow_tbl_masks_cache_size(&dp->table))) + goto nla_put_failure; + + if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && pids) { + pids_len = min(pids->n_pids, nr_cpu_ids) * sizeof(u32); + if (nla_put(skb, OVS_DP_ATTR_PER_CPU_PIDS, pids_len, &pids->pids)) + 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(void) +{ + return genlmsg_new(ovs_dp_cmd_msg_size(), 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), genl_info_userhdr(info), + info->attrs); + if (IS_ERR(dp)) + return; + + pr_warn("%s: Dropping previously announced user features\n", + ovs_dp_name(dp)); + dp->user_features = 0; +} + +static int ovs_dp_set_upcall_portids(struct datapath *dp, + const struct nlattr *ids) +{ + struct dp_nlsk_pids *old, *dp_nlsk_pids; + + if (!nla_len(ids) || nla_len(ids) % sizeof(u32)) + return -EINVAL; + + old = ovsl_dereference(dp->upcall_portids); + + dp_nlsk_pids = kmalloc(sizeof(*dp_nlsk_pids) + nla_len(ids), + GFP_KERNEL); + if (!dp_nlsk_pids) + return -ENOMEM; + + dp_nlsk_pids->n_pids = nla_len(ids) / sizeof(u32); + nla_memcpy(dp_nlsk_pids->pids, ids, nla_len(ids)); + + rcu_assign_pointer(dp->upcall_portids, dp_nlsk_pids); + + kfree_rcu(old, rcu); + + return 0; +} + +u32 ovs_dp_get_upcall_portid(const struct datapath *dp, uint32_t cpu_id) +{ + struct dp_nlsk_pids *dp_nlsk_pids; + + dp_nlsk_pids = rcu_dereference(dp->upcall_portids); + + if (dp_nlsk_pids) { + if (cpu_id < dp_nlsk_pids->n_pids) { + return dp_nlsk_pids->pids[cpu_id]; + } else if (dp_nlsk_pids->n_pids > 0 && + cpu_id >= dp_nlsk_pids->n_pids) { + /* If the number of netlink PIDs is mismatched with + * the number of CPUs as seen by the kernel, log this + * and send the upcall to an arbitrary socket (0) in + * order to not drop packets + */ + pr_info_ratelimited("cpu_id mismatch with handler threads"); + return dp_nlsk_pids->pids[cpu_id % + dp_nlsk_pids->n_pids]; + } else { + return 0; + } + } else { + return 0; + } +} + +static int ovs_dp_change(struct datapath *dp, struct nlattr *a[]) +{ + u32 user_features = 0, old_features = dp->user_features; + int err; + + if (a[OVS_DP_ATTR_USER_FEATURES]) { + user_features = nla_get_u32(a[OVS_DP_ATTR_USER_FEATURES]); + + if (user_features & ~(OVS_DP_F_VPORT_PIDS | + OVS_DP_F_UNALIGNED | + OVS_DP_F_TC_RECIRC_SHARING | + OVS_DP_F_DISPATCH_UPCALL_PER_CPU)) + return -EOPNOTSUPP; + +#if !IS_ENABLED(CONFIG_NET_TC_SKB_EXT) + if (user_features & OVS_DP_F_TC_RECIRC_SHARING) + return -EOPNOTSUPP; +#endif + } + + if (a[OVS_DP_ATTR_MASKS_CACHE_SIZE]) { + int err; + u32 cache_size; + + cache_size = nla_get_u32(a[OVS_DP_ATTR_MASKS_CACHE_SIZE]); + err = ovs_flow_tbl_masks_cache_resize(&dp->table, cache_size); + if (err) + return err; + } + + dp->user_features = user_features; + + if (dp->user_features & OVS_DP_F_DISPATCH_UPCALL_PER_CPU && + a[OVS_DP_ATTR_PER_CPU_PIDS]) { + /* Upcall Netlink Port IDs have been updated */ + err = ovs_dp_set_upcall_portids(dp, + a[OVS_DP_ATTR_PER_CPU_PIDS]); + if (err) + return err; + } + + if ((dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && + !(old_features & OVS_DP_F_TC_RECIRC_SHARING)) + tc_skb_ext_tc_enable(); + else if (!(dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) && + (old_features & OVS_DP_F_TC_RECIRC_SHARING)) + tc_skb_ext_tc_disable(); + + return 0; +} + +static int ovs_dp_stats_init(struct datapath *dp) +{ + dp->stats_percpu = netdev_alloc_pcpu_stats(struct dp_stats_percpu); + if (!dp->stats_percpu) + return -ENOMEM; + + return 0; +} + +static int ovs_dp_vport_init(struct datapath *dp) +{ + int i; + + dp->ports = kmalloc_array(DP_VPORT_HASH_BUCKETS, + sizeof(struct hlist_head), + GFP_KERNEL); + if (!dp->ports) + return -ENOMEM; + + for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) + INIT_HLIST_HEAD(&dp->ports[i]); + + return 0; +} + +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; + + err = -EINVAL; + if (!a[OVS_DP_ATTR_NAME] || !a[OVS_DP_ATTR_UPCALL_PID]) + goto err; + + reply = ovs_dp_cmd_alloc_info(); + if (!reply) + return -ENOMEM; + + err = -ENOMEM; + dp = kzalloc(sizeof(*dp), GFP_KERNEL); + if (dp == NULL) + goto err_destroy_reply; + + ovs_dp_set_net(dp, sock_net(skb->sk)); + + /* Allocate table. */ + err = ovs_flow_tbl_init(&dp->table); + if (err) + goto err_destroy_dp; + + err = ovs_dp_stats_init(dp); + if (err) + goto err_destroy_table; + + err = ovs_dp_vport_init(dp); + if (err) + goto err_destroy_stats; + + err = ovs_meters_init(dp); + if (err) + goto err_destroy_ports; + + /* 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]; + parms.desired_ifindex = a[OVS_DP_ATTR_IFINDEX] + ? nla_get_s32(a[OVS_DP_ATTR_IFINDEX]) : 0; + + /* So far only local changes have been made, now need the lock. */ + ovs_lock(); + + err = ovs_dp_change(dp, a); + if (err) + goto err_unlock_and_destroy_meters; + + 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_portids; + } + + 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_portids: + kfree(rcu_dereference_raw(dp->upcall_portids)); +err_unlock_and_destroy_meters: + ovs_unlock(); + ovs_meters_exit(dp); +err_destroy_ports: + kfree(dp->ports); +err_destroy_stats: + free_percpu(dp->stats_percpu); +err_destroy_table: + ovs_flow_tbl_destroy(&dp->table); +err_destroy_dp: + kfree(dp); +err_destroy_reply: + kfree_skb(reply); +err: + return err; +} + +/* Called with ovs_mutex. */ +static void __dp_destroy(struct datapath *dp) +{ + struct flow_table *table = &dp->table; + int i; + + if (dp->user_features & OVS_DP_F_TC_RECIRC_SHARING) + tc_skb_ext_tc_disable(); + + 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)); + + /* Flush sw_flow in the tables. RCU cb only releases resource + * such as dp, ports and tables. That may avoid some issues + * such as RCU usage warning. + */ + table_instance_flow_flush(table, ovsl_dereference(table->ti), + ovsl_dereference(table->ufid_ti)); + + /* RCU destroy the ports, meters and flow tables. */ + 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(); + if (!reply) + return -ENOMEM; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), + 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(); + if (!reply) + return -ENOMEM; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), + info->attrs); + err = PTR_ERR(dp); + if (IS_ERR(dp)) + goto err_unlock_free; + + err = ovs_dp_change(dp, info->attrs); + if (err) + goto err_unlock_free; + + err = ovs_dp_cmd_fill_info(dp, reply, info->snd_portid, + info->snd_seq, 0, OVS_DP_CMD_SET); + 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(); + if (!reply) + return -ENOMEM; + + ovs_lock(); + dp = lookup_datapath(sock_net(skb->sk), genl_info_userhdr(info), + 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_GET); + 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_GET) < 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 }, + [OVS_DP_ATTR_MASKS_CACHE_SIZE] = NLA_POLICY_RANGE(NLA_U32, 0, + PCPU_MIN_UNIT_SIZE / sizeof(struct mask_cache_entry)), + [OVS_DP_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), +}; + +static const struct genl_small_ops dp_datapath_genl_ops[] = { + { .cmd = OVS_DP_CMD_NEW, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_dp_cmd_new + }, + { .cmd = OVS_DP_CMD_DEL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_dp_cmd_del + }, + { .cmd = OVS_DP_CMD_GET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = 0, /* OK for unprivileged users. */ + .doit = ovs_dp_cmd_get, + .dumpit = ovs_dp_cmd_dump + }, + { .cmd = OVS_DP_CMD_SET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_dp_cmd_set, + }, +}; + +static struct genl_family dp_datapath_genl_family __ro_after_init = { + .hdrsize = sizeof(struct ovs_header), + .name = OVS_DATAPATH_FAMILY, + .version = OVS_DATAPATH_VERSION, + .maxattr = OVS_DP_ATTR_MAX, + .policy = datapath_policy, + .netnsok = true, + .parallel_ops = true, + .small_ops = dp_datapath_genl_ops, + .n_small_ops = ARRAY_SIZE(dp_datapath_genl_ops), + .resv_start_op = OVS_DP_CMD_SET + 1, + .mcgrps = &ovs_dp_datapath_multicast_group, + .n_mcgrps = 1, + .module = THIS_MODULE, +}; + +/* Called with ovs_mutex or RCU read lock. */ +static int ovs_vport_cmd_fill_info(struct vport *vport, struct sk_buff *skb, + struct net *net, u32 portid, u32 seq, + u32 flags, u8 cmd, gfp_t gfp) +{ + 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)) || + nla_put_u32(skb, OVS_VPORT_ATTR_IFINDEX, vport->dev->ifindex)) + goto nla_put_failure; + + if (!net_eq(net, dev_net(vport->dev))) { + int id = peernet2id_alloc(net, dev_net(vport->dev), gfp); + + if (nla_put_s32(skb, OVS_VPORT_ATTR_NETNSID, id)) + goto nla_put_failure; + } + + ovs_vport_get_stats(vport, &vport_stats); + if (nla_put_64bit(skb, OVS_VPORT_ATTR_STATS, + sizeof(struct ovs_vport_stats), &vport_stats, + OVS_VPORT_ATTR_PAD)) + goto nla_put_failure; + + if (ovs_vport_get_upcall_stats(vport, skb)) + 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, struct net *net, + u32 portid, u32 seq, u8 cmd) +{ + struct sk_buff *skb; + int retval; + + skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); + if (!skb) + return ERR_PTR(-ENOMEM); + + retval = ovs_vport_cmd_fill_info(vport, skb, net, portid, seq, 0, cmd, + GFP_KERNEL); + 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_IFINDEX]) + return ERR_PTR(-EOPNOTSUPP); + 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 unsigned int ovs_get_max_headroom(struct datapath *dp) +{ + unsigned int dev_headroom, max_headroom = 0; + struct net_device *dev; + struct vport *vport; + int i; + + for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { + hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, + lockdep_ovsl_is_held()) { + dev = vport->dev; + dev_headroom = netdev_get_fwd_headroom(dev); + if (dev_headroom > max_headroom) + max_headroom = dev_headroom; + } + } + + return max_headroom; +} + +/* Called with ovs_mutex */ +static void ovs_update_headroom(struct datapath *dp, unsigned int new_headroom) +{ + struct vport *vport; + int i; + + dp->max_headroom = new_headroom; + for (i = 0; i < DP_VPORT_HASH_BUCKETS; i++) { + hlist_for_each_entry_rcu(vport, &dp->ports[i], dp_hash_node, + lockdep_ovsl_is_held()) + netdev_set_rx_headroom(vport->dev, new_headroom); + } +} + +static int ovs_vport_cmd_new(struct sk_buff *skb, struct genl_info *info) +{ + struct nlattr **a = info->attrs; + struct ovs_header *ovs_header = genl_info_userhdr(info); + struct vport_parms parms; + struct sk_buff *reply; + struct vport *vport; + struct datapath *dp; + unsigned int new_headroom; + u32 port_no; + int err; + + if (!a[OVS_VPORT_ATTR_NAME] || !a[OVS_VPORT_ATTR_TYPE] || + !a[OVS_VPORT_ATTR_UPCALL_PID]) + return -EINVAL; + + parms.type = nla_get_u32(a[OVS_VPORT_ATTR_TYPE]); + + if (a[OVS_VPORT_ATTR_IFINDEX] && parms.type != OVS_VPORT_TYPE_INTERNAL) + return -EOPNOTSUPP; + + 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.options = a[OVS_VPORT_ATTR_OPTIONS]; + parms.dp = dp; + parms.port_no = port_no; + parms.upcall_portids = a[OVS_VPORT_ATTR_UPCALL_PID]; + parms.desired_ifindex = a[OVS_VPORT_ATTR_IFINDEX] + ? nla_get_s32(a[OVS_VPORT_ATTR_IFINDEX]) : 0; + + 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, genl_info_net(info), + info->snd_portid, info->snd_seq, 0, + OVS_VPORT_CMD_NEW, GFP_KERNEL); + + new_headroom = netdev_get_fwd_headroom(vport->dev); + + if (new_headroom > dp->max_headroom) + ovs_update_headroom(dp, new_headroom); + else + netdev_set_rx_headroom(vport->dev, dp->max_headroom); + + 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), genl_info_userhdr(info), 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, genl_info_net(info), + info->snd_portid, info->snd_seq, 0, + OVS_VPORT_CMD_SET, GFP_KERNEL); + 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) +{ + bool update_headroom = false; + struct nlattr **a = info->attrs; + struct sk_buff *reply; + struct datapath *dp; + struct vport *vport; + unsigned int new_headroom; + int err; + + reply = ovs_vport_cmd_alloc_info(); + if (!reply) + return -ENOMEM; + + ovs_lock(); + vport = lookup_vport(sock_net(skb->sk), genl_info_userhdr(info), 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, genl_info_net(info), + info->snd_portid, info->snd_seq, 0, + OVS_VPORT_CMD_DEL, GFP_KERNEL); + BUG_ON(err < 0); + + /* the vport deletion may trigger dp headroom update */ + dp = vport->dp; + if (netdev_get_fwd_headroom(vport->dev) == dp->max_headroom) + update_headroom = true; + + netdev_reset_rx_headroom(vport->dev); + ovs_dp_detach_port(vport); + + if (update_headroom) { + new_headroom = ovs_get_max_headroom(dp); + + if (new_headroom < dp->max_headroom) + ovs_update_headroom(dp, new_headroom); + } + 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 = genl_info_userhdr(info); + 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, genl_info_net(info), + info->snd_portid, info->snd_seq, 0, + OVS_VPORT_CMD_GET, GFP_ATOMIC); + 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, + sock_net(skb->sk), + NETLINK_CB(cb->skb).portid, + cb->nlh->nlmsg_seq, + NLM_F_MULTI, + OVS_VPORT_CMD_GET, + GFP_ATOMIC) < 0) + goto out; + + j++; + } + skip = 0; + } +out: + rcu_read_unlock(); + + cb->args[0] = i; + cb->args[1] = j; + + return skb->len; +} + +static void ovs_dp_masks_rebalance(struct work_struct *work) +{ + struct ovs_net *ovs_net = container_of(work, struct ovs_net, + masks_rebalance.work); + struct datapath *dp; + + ovs_lock(); + + list_for_each_entry(dp, &ovs_net->dps, list_node) + ovs_flow_masks_rebalance(&dp->table); + + ovs_unlock(); + + schedule_delayed_work(&ovs_net->masks_rebalance, + msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); +} + +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_UNSPEC }, + [OVS_VPORT_ATTR_OPTIONS] = { .type = NLA_NESTED }, + [OVS_VPORT_ATTR_IFINDEX] = NLA_POLICY_MIN(NLA_S32, 0), + [OVS_VPORT_ATTR_NETNSID] = { .type = NLA_S32 }, + [OVS_VPORT_ATTR_UPCALL_STATS] = { .type = NLA_NESTED }, +}; + +static const struct genl_small_ops dp_vport_genl_ops[] = { + { .cmd = OVS_VPORT_CMD_NEW, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_vport_cmd_new + }, + { .cmd = OVS_VPORT_CMD_DEL, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_vport_cmd_del + }, + { .cmd = OVS_VPORT_CMD_GET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = 0, /* OK for unprivileged users. */ + .doit = ovs_vport_cmd_get, + .dumpit = ovs_vport_cmd_dump + }, + { .cmd = OVS_VPORT_CMD_SET, + .validate = GENL_DONT_VALIDATE_STRICT | GENL_DONT_VALIDATE_DUMP, + .flags = GENL_UNS_ADMIN_PERM, /* Requires CAP_NET_ADMIN privilege. */ + .doit = ovs_vport_cmd_set, + }, +}; + +struct genl_family dp_vport_genl_family __ro_after_init = { + .hdrsize = sizeof(struct ovs_header), + .name = OVS_VPORT_FAMILY, + .version = OVS_VPORT_VERSION, + .maxattr = OVS_VPORT_ATTR_MAX, + .policy = vport_policy, + .netnsok = true, + .parallel_ops = true, + .small_ops = dp_vport_genl_ops, + .n_small_ops = ARRAY_SIZE(dp_vport_genl_ops), + .resv_start_op = OVS_VPORT_CMD_SET + 1, + .mcgrps = &ovs_dp_vport_multicast_group, + .n_mcgrps = 1, + .module = THIS_MODULE, +}; + +static struct genl_family * const dp_genl_families[] = { + &dp_datapath_genl_family, + &dp_vport_genl_family, + &dp_flow_genl_family, + &dp_packet_genl_family, + &dp_meter_genl_family, +#if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT) + &dp_ct_limit_genl_family, +#endif +}; + +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 __init 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); + int err; + + INIT_LIST_HEAD(&ovs_net->dps); + INIT_WORK(&ovs_net->dp_notify_work, ovs_dp_notify_wq); + INIT_DELAYED_WORK(&ovs_net->masks_rebalance, ovs_dp_masks_rebalance); + + err = ovs_ct_init(net); + if (err) + return err; + + schedule_delayed_work(&ovs_net->masks_rebalance, + msecs_to_jiffies(DP_MASKS_REBALANCE_INTERVAL)); + 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_lock(); + + ovs_ct_exit(dnet); + + list_for_each_entry_safe(dp, dp_next, &ovs_net->dps, list_node) + __dp_destroy(dp); + + down_read(&net_rwsem); + for_each_net(net) + list_vports_from_net(net, dnet, &head); + up_read(&net_rwsem); + + /* 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_delayed_work_sync(&ovs_net->masks_rebalance); + 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 const char * const ovs_drop_reasons[] = { +#define S(x) (#x), + OVS_DROP_REASONS(S) +#undef S +}; + +static struct drop_reason_list drop_reason_list_ovs = { + .reasons = ovs_drop_reasons, + .n_reasons = ARRAY_SIZE(ovs_drop_reasons), +}; + +static int __init dp_init(void) +{ + int err; + + BUILD_BUG_ON(sizeof(struct ovs_skb_cb) > + sizeof_field(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; + + drop_reasons_register_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH, + &drop_reason_list_ovs); + + 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); + drop_reasons_unregister_subsys(SKB_DROP_REASON_SUBSYS_OPENVSWITCH); + 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"); +MODULE_ALIAS_GENL_FAMILY(OVS_DATAPATH_FAMILY); +MODULE_ALIAS_GENL_FAMILY(OVS_VPORT_FAMILY); +MODULE_ALIAS_GENL_FAMILY(OVS_FLOW_FAMILY); +MODULE_ALIAS_GENL_FAMILY(OVS_PACKET_FAMILY); +MODULE_ALIAS_GENL_FAMILY(OVS_METER_FAMILY); +MODULE_ALIAS_GENL_FAMILY(OVS_CT_LIMIT_FAMILY); |