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- /*
- * Copyright (c) 2015 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.
- */
- #include <linux/module.h>
- #include <linux/openvswitch.h>
- #include <linux/tcp.h>
- #include <linux/udp.h>
- #include <linux/sctp.h>
- #include <linux/static_key.h>
- #include <net/ip.h>
- #include <net/genetlink.h>
- #include <net/netfilter/nf_conntrack_core.h>
- #include <net/netfilter/nf_conntrack_count.h>
- #include <net/netfilter/nf_conntrack_helper.h>
- #include <net/netfilter/nf_conntrack_labels.h>
- #include <net/netfilter/nf_conntrack_seqadj.h>
- #include <net/netfilter/nf_conntrack_zones.h>
- #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
- #include <net/ipv6_frag.h>
- #ifdef CONFIG_NF_NAT_NEEDED
- #include <linux/netfilter/nf_nat.h>
- #include <net/netfilter/nf_nat_core.h>
- #include <net/netfilter/nf_nat_l3proto.h>
- #endif
- #include "datapath.h"
- #include "conntrack.h"
- #include "flow.h"
- #include "flow_netlink.h"
- struct ovs_ct_len_tbl {
- int maxlen;
- int minlen;
- };
- /* Metadata mark for masked write to conntrack mark */
- struct md_mark {
- u32 value;
- u32 mask;
- };
- /* Metadata label for masked write to conntrack label. */
- struct md_labels {
- struct ovs_key_ct_labels value;
- struct ovs_key_ct_labels mask;
- };
- enum ovs_ct_nat {
- OVS_CT_NAT = 1 << 0, /* NAT for committed connections only. */
- OVS_CT_SRC_NAT = 1 << 1, /* Source NAT for NEW connections. */
- OVS_CT_DST_NAT = 1 << 2, /* Destination NAT for NEW connections. */
- };
- /* Conntrack action context for execution. */
- struct ovs_conntrack_info {
- struct nf_conntrack_helper *helper;
- struct nf_conntrack_zone zone;
- struct nf_conn *ct;
- u8 commit : 1;
- u8 nat : 3; /* enum ovs_ct_nat */
- u8 force : 1;
- u8 have_eventmask : 1;
- u16 family;
- u32 eventmask; /* Mask of 1 << IPCT_*. */
- struct md_mark mark;
- struct md_labels labels;
- #ifdef CONFIG_NF_NAT_NEEDED
- struct nf_nat_range2 range; /* Only present for SRC NAT and DST NAT. */
- #endif
- };
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- #define OVS_CT_LIMIT_UNLIMITED 0
- #define OVS_CT_LIMIT_DEFAULT OVS_CT_LIMIT_UNLIMITED
- #define CT_LIMIT_HASH_BUCKETS 512
- static DEFINE_STATIC_KEY_FALSE(ovs_ct_limit_enabled);
- struct ovs_ct_limit {
- /* Elements in ovs_ct_limit_info->limits hash table */
- struct hlist_node hlist_node;
- struct rcu_head rcu;
- u16 zone;
- u32 limit;
- };
- struct ovs_ct_limit_info {
- u32 default_limit;
- struct hlist_head *limits;
- struct nf_conncount_data *data;
- };
- static const struct nla_policy ct_limit_policy[OVS_CT_LIMIT_ATTR_MAX + 1] = {
- [OVS_CT_LIMIT_ATTR_ZONE_LIMIT] = { .type = NLA_NESTED, },
- };
- #endif
- static bool labels_nonzero(const struct ovs_key_ct_labels *labels);
- static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info);
- static u16 key_to_nfproto(const struct sw_flow_key *key)
- {
- switch (ntohs(key->eth.type)) {
- case ETH_P_IP:
- return NFPROTO_IPV4;
- case ETH_P_IPV6:
- return NFPROTO_IPV6;
- default:
- return NFPROTO_UNSPEC;
- }
- }
- /* Map SKB connection state into the values used by flow definition. */
- static u8 ovs_ct_get_state(enum ip_conntrack_info ctinfo)
- {
- u8 ct_state = OVS_CS_F_TRACKED;
- switch (ctinfo) {
- case IP_CT_ESTABLISHED_REPLY:
- case IP_CT_RELATED_REPLY:
- ct_state |= OVS_CS_F_REPLY_DIR;
- break;
- default:
- break;
- }
- switch (ctinfo) {
- case IP_CT_ESTABLISHED:
- case IP_CT_ESTABLISHED_REPLY:
- ct_state |= OVS_CS_F_ESTABLISHED;
- break;
- case IP_CT_RELATED:
- case IP_CT_RELATED_REPLY:
- ct_state |= OVS_CS_F_RELATED;
- break;
- case IP_CT_NEW:
- ct_state |= OVS_CS_F_NEW;
- break;
- default:
- break;
- }
- return ct_state;
- }
- static u32 ovs_ct_get_mark(const struct nf_conn *ct)
- {
- #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
- return ct ? ct->mark : 0;
- #else
- return 0;
- #endif
- }
- /* Guard against conntrack labels max size shrinking below 128 bits. */
- #if NF_CT_LABELS_MAX_SIZE < 16
- #error NF_CT_LABELS_MAX_SIZE must be at least 16 bytes
- #endif
- static void ovs_ct_get_labels(const struct nf_conn *ct,
- struct ovs_key_ct_labels *labels)
- {
- struct nf_conn_labels *cl = ct ? nf_ct_labels_find(ct) : NULL;
- if (cl)
- memcpy(labels, cl->bits, OVS_CT_LABELS_LEN);
- else
- memset(labels, 0, OVS_CT_LABELS_LEN);
- }
- static void __ovs_ct_update_key_orig_tp(struct sw_flow_key *key,
- const struct nf_conntrack_tuple *orig,
- u8 icmp_proto)
- {
- key->ct_orig_proto = orig->dst.protonum;
- if (orig->dst.protonum == icmp_proto) {
- key->ct.orig_tp.src = htons(orig->dst.u.icmp.type);
- key->ct.orig_tp.dst = htons(orig->dst.u.icmp.code);
- } else {
- key->ct.orig_tp.src = orig->src.u.all;
- key->ct.orig_tp.dst = orig->dst.u.all;
- }
- }
- static void __ovs_ct_update_key(struct sw_flow_key *key, u8 state,
- const struct nf_conntrack_zone *zone,
- const struct nf_conn *ct)
- {
- key->ct_state = state;
- key->ct_zone = zone->id;
- key->ct.mark = ovs_ct_get_mark(ct);
- ovs_ct_get_labels(ct, &key->ct.labels);
- if (ct) {
- const struct nf_conntrack_tuple *orig;
- /* Use the master if we have one. */
- if (ct->master)
- ct = ct->master;
- orig = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
- /* IP version must match with the master connection. */
- if (key->eth.type == htons(ETH_P_IP) &&
- nf_ct_l3num(ct) == NFPROTO_IPV4) {
- key->ipv4.ct_orig.src = orig->src.u3.ip;
- key->ipv4.ct_orig.dst = orig->dst.u3.ip;
- __ovs_ct_update_key_orig_tp(key, orig, IPPROTO_ICMP);
- return;
- } else if (key->eth.type == htons(ETH_P_IPV6) &&
- !sw_flow_key_is_nd(key) &&
- nf_ct_l3num(ct) == NFPROTO_IPV6) {
- key->ipv6.ct_orig.src = orig->src.u3.in6;
- key->ipv6.ct_orig.dst = orig->dst.u3.in6;
- __ovs_ct_update_key_orig_tp(key, orig, NEXTHDR_ICMP);
- return;
- }
- }
- /* Clear 'ct_orig_proto' to mark the non-existence of conntrack
- * original direction key fields.
- */
- key->ct_orig_proto = 0;
- }
- /* Update 'key' based on skb->_nfct. If 'post_ct' is true, then OVS has
- * previously sent the packet to conntrack via the ct action. If
- * 'keep_nat_flags' is true, the existing NAT flags retained, else they are
- * initialized from the connection status.
- */
- static void ovs_ct_update_key(const struct sk_buff *skb,
- const struct ovs_conntrack_info *info,
- struct sw_flow_key *key, bool post_ct,
- bool keep_nat_flags)
- {
- const struct nf_conntrack_zone *zone = &nf_ct_zone_dflt;
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- u8 state = 0;
- ct = nf_ct_get(skb, &ctinfo);
- if (ct) {
- state = ovs_ct_get_state(ctinfo);
- /* All unconfirmed entries are NEW connections. */
- if (!nf_ct_is_confirmed(ct))
- state |= OVS_CS_F_NEW;
- /* OVS persists the related flag for the duration of the
- * connection.
- */
- if (ct->master)
- state |= OVS_CS_F_RELATED;
- if (keep_nat_flags) {
- state |= key->ct_state & OVS_CS_F_NAT_MASK;
- } else {
- if (ct->status & IPS_SRC_NAT)
- state |= OVS_CS_F_SRC_NAT;
- if (ct->status & IPS_DST_NAT)
- state |= OVS_CS_F_DST_NAT;
- }
- zone = nf_ct_zone(ct);
- } else if (post_ct) {
- state = OVS_CS_F_TRACKED | OVS_CS_F_INVALID;
- if (info)
- zone = &info->zone;
- }
- __ovs_ct_update_key(key, state, zone, ct);
- }
- /* This is called to initialize CT key fields possibly coming in from the local
- * stack.
- */
- void ovs_ct_fill_key(const struct sk_buff *skb, struct sw_flow_key *key)
- {
- ovs_ct_update_key(skb, NULL, key, false, false);
- }
- #define IN6_ADDR_INITIALIZER(ADDR) \
- { (ADDR).s6_addr32[0], (ADDR).s6_addr32[1], \
- (ADDR).s6_addr32[2], (ADDR).s6_addr32[3] }
- int ovs_ct_put_key(const struct sw_flow_key *swkey,
- const struct sw_flow_key *output, struct sk_buff *skb)
- {
- if (nla_put_u32(skb, OVS_KEY_ATTR_CT_STATE, output->ct_state))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
- nla_put_u16(skb, OVS_KEY_ATTR_CT_ZONE, output->ct_zone))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
- nla_put_u32(skb, OVS_KEY_ATTR_CT_MARK, output->ct.mark))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
- nla_put(skb, OVS_KEY_ATTR_CT_LABELS, sizeof(output->ct.labels),
- &output->ct.labels))
- return -EMSGSIZE;
- if (swkey->ct_orig_proto) {
- if (swkey->eth.type == htons(ETH_P_IP)) {
- struct ovs_key_ct_tuple_ipv4 orig = {
- output->ipv4.ct_orig.src,
- output->ipv4.ct_orig.dst,
- output->ct.orig_tp.src,
- output->ct.orig_tp.dst,
- output->ct_orig_proto,
- };
- if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV4,
- sizeof(orig), &orig))
- return -EMSGSIZE;
- } else if (swkey->eth.type == htons(ETH_P_IPV6)) {
- struct ovs_key_ct_tuple_ipv6 orig = {
- IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.src),
- IN6_ADDR_INITIALIZER(output->ipv6.ct_orig.dst),
- output->ct.orig_tp.src,
- output->ct.orig_tp.dst,
- output->ct_orig_proto,
- };
- if (nla_put(skb, OVS_KEY_ATTR_CT_ORIG_TUPLE_IPV6,
- sizeof(orig), &orig))
- return -EMSGSIZE;
- }
- }
- return 0;
- }
- static int ovs_ct_set_mark(struct nf_conn *ct, struct sw_flow_key *key,
- u32 ct_mark, u32 mask)
- {
- #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
- u32 new_mark;
- new_mark = ct_mark | (ct->mark & ~(mask));
- if (ct->mark != new_mark) {
- ct->mark = new_mark;
- if (nf_ct_is_confirmed(ct))
- nf_conntrack_event_cache(IPCT_MARK, ct);
- key->ct.mark = new_mark;
- }
- return 0;
- #else
- return -ENOTSUPP;
- #endif
- }
- static struct nf_conn_labels *ovs_ct_get_conn_labels(struct nf_conn *ct)
- {
- struct nf_conn_labels *cl;
- cl = nf_ct_labels_find(ct);
- if (!cl) {
- nf_ct_labels_ext_add(ct);
- cl = nf_ct_labels_find(ct);
- }
- return cl;
- }
- /* Initialize labels for a new, yet to be committed conntrack entry. Note that
- * since the new connection is not yet confirmed, and thus no-one else has
- * access to it's labels, we simply write them over.
- */
- static int ovs_ct_init_labels(struct nf_conn *ct, struct sw_flow_key *key,
- const struct ovs_key_ct_labels *labels,
- const struct ovs_key_ct_labels *mask)
- {
- struct nf_conn_labels *cl, *master_cl;
- bool have_mask = labels_nonzero(mask);
- /* Inherit master's labels to the related connection? */
- master_cl = ct->master ? nf_ct_labels_find(ct->master) : NULL;
- if (!master_cl && !have_mask)
- return 0; /* Nothing to do. */
- cl = ovs_ct_get_conn_labels(ct);
- if (!cl)
- return -ENOSPC;
- /* Inherit the master's labels, if any. */
- if (master_cl)
- *cl = *master_cl;
- if (have_mask) {
- u32 *dst = (u32 *)cl->bits;
- int i;
- for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
- dst[i] = (dst[i] & ~mask->ct_labels_32[i]) |
- (labels->ct_labels_32[i]
- & mask->ct_labels_32[i]);
- }
- /* Labels are included in the IPCTNL_MSG_CT_NEW event only if the
- * IPCT_LABEL bit is set in the event cache.
- */
- nf_conntrack_event_cache(IPCT_LABEL, ct);
- memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
- return 0;
- }
- static int ovs_ct_set_labels(struct nf_conn *ct, struct sw_flow_key *key,
- const struct ovs_key_ct_labels *labels,
- const struct ovs_key_ct_labels *mask)
- {
- struct nf_conn_labels *cl;
- int err;
- cl = ovs_ct_get_conn_labels(ct);
- if (!cl)
- return -ENOSPC;
- err = nf_connlabels_replace(ct, labels->ct_labels_32,
- mask->ct_labels_32,
- OVS_CT_LABELS_LEN_32);
- if (err)
- return err;
- memcpy(&key->ct.labels, cl->bits, OVS_CT_LABELS_LEN);
- return 0;
- }
- /* 'skb' should already be pulled to nh_ofs. */
- static int ovs_ct_helper(struct sk_buff *skb, u16 proto)
- {
- const struct nf_conntrack_helper *helper;
- const struct nf_conn_help *help;
- enum ip_conntrack_info ctinfo;
- unsigned int protoff;
- struct nf_conn *ct;
- int err;
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct || ctinfo == IP_CT_RELATED_REPLY)
- return NF_ACCEPT;
- help = nfct_help(ct);
- if (!help)
- return NF_ACCEPT;
- helper = rcu_dereference(help->helper);
- if (!helper)
- return NF_ACCEPT;
- switch (proto) {
- case NFPROTO_IPV4:
- protoff = ip_hdrlen(skb);
- break;
- case NFPROTO_IPV6: {
- u8 nexthdr = ipv6_hdr(skb)->nexthdr;
- __be16 frag_off;
- int ofs;
- ofs = ipv6_skip_exthdr(skb, sizeof(struct ipv6hdr), &nexthdr,
- &frag_off);
- if (ofs < 0 || (frag_off & htons(~0x7)) != 0) {
- pr_debug("proto header not found\n");
- return NF_ACCEPT;
- }
- protoff = ofs;
- break;
- }
- default:
- WARN_ONCE(1, "helper invoked on non-IP family!");
- return NF_DROP;
- }
- err = helper->help(skb, protoff, ct, ctinfo);
- if (err != NF_ACCEPT)
- return err;
- /* Adjust seqs after helper. This is needed due to some helpers (e.g.,
- * FTP with NAT) adusting the TCP payload size when mangling IP
- * addresses and/or port numbers in the text-based control connection.
- */
- if (test_bit(IPS_SEQ_ADJUST_BIT, &ct->status) &&
- !nf_ct_seq_adjust(skb, ct, ctinfo, protoff))
- return NF_DROP;
- return NF_ACCEPT;
- }
- /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
- * value if 'skb' is freed.
- */
- static int handle_fragments(struct net *net, struct sw_flow_key *key,
- u16 zone, struct sk_buff *skb)
- {
- struct ovs_skb_cb ovs_cb = *OVS_CB(skb);
- int err;
- if (key->eth.type == htons(ETH_P_IP)) {
- enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- err = ip_defrag(net, skb, user);
- if (err)
- return err;
- ovs_cb.mru = IPCB(skb)->frag_max_size;
- #if IS_ENABLED(CONFIG_NF_DEFRAG_IPV6)
- } else if (key->eth.type == htons(ETH_P_IPV6)) {
- enum ip6_defrag_users user = IP6_DEFRAG_CONNTRACK_IN + zone;
- memset(IP6CB(skb), 0, sizeof(struct inet6_skb_parm));
- err = nf_ct_frag6_gather(net, skb, user);
- if (err) {
- if (err != -EINPROGRESS)
- kfree_skb(skb);
- return err;
- }
- key->ip.proto = ipv6_hdr(skb)->nexthdr;
- ovs_cb.mru = IP6CB(skb)->frag_max_size;
- #endif
- } else {
- kfree_skb(skb);
- return -EPFNOSUPPORT;
- }
- key->ip.frag = OVS_FRAG_TYPE_NONE;
- skb_clear_hash(skb);
- skb->ignore_df = 1;
- *OVS_CB(skb) = ovs_cb;
- return 0;
- }
- static struct nf_conntrack_expect *
- ovs_ct_expect_find(struct net *net, const struct nf_conntrack_zone *zone,
- u16 proto, const struct sk_buff *skb)
- {
- struct nf_conntrack_tuple tuple;
- struct nf_conntrack_expect *exp;
- if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), proto, net, &tuple))
- return NULL;
- exp = __nf_ct_expect_find(net, zone, &tuple);
- if (exp) {
- struct nf_conntrack_tuple_hash *h;
- /* Delete existing conntrack entry, if it clashes with the
- * expectation. This can happen since conntrack ALGs do not
- * check for clashes between (new) expectations and existing
- * conntrack entries. nf_conntrack_in() will check the
- * expectations only if a conntrack entry can not be found,
- * which can lead to OVS finding the expectation (here) in the
- * init direction, but which will not be removed by the
- * nf_conntrack_in() call, if a matching conntrack entry is
- * found instead. In this case all init direction packets
- * would be reported as new related packets, while reply
- * direction packets would be reported as un-related
- * established packets.
- */
- h = nf_conntrack_find_get(net, zone, &tuple);
- if (h) {
- struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
- nf_ct_delete(ct, 0, 0);
- nf_conntrack_put(&ct->ct_general);
- }
- }
- return exp;
- }
- /* This replicates logic from nf_conntrack_core.c that is not exported. */
- static enum ip_conntrack_info
- ovs_ct_get_info(const struct nf_conntrack_tuple_hash *h)
- {
- const struct nf_conn *ct = nf_ct_tuplehash_to_ctrack(h);
- if (NF_CT_DIRECTION(h) == IP_CT_DIR_REPLY)
- return IP_CT_ESTABLISHED_REPLY;
- /* Once we've had two way comms, always ESTABLISHED. */
- if (test_bit(IPS_SEEN_REPLY_BIT, &ct->status))
- return IP_CT_ESTABLISHED;
- if (test_bit(IPS_EXPECTED_BIT, &ct->status))
- return IP_CT_RELATED;
- return IP_CT_NEW;
- }
- /* Find an existing connection which this packet belongs to without
- * re-attributing statistics or modifying the connection state. This allows an
- * skb->_nfct lost due to an upcall to be recovered during actions execution.
- *
- * Must be called with rcu_read_lock.
- *
- * On success, populates skb->_nfct and returns the connection. Returns NULL
- * if there is no existing entry.
- */
- static struct nf_conn *
- ovs_ct_find_existing(struct net *net, const struct nf_conntrack_zone *zone,
- u8 l3num, struct sk_buff *skb, bool natted)
- {
- struct nf_conntrack_tuple tuple;
- struct nf_conntrack_tuple_hash *h;
- struct nf_conn *ct;
- if (!nf_ct_get_tuplepr(skb, skb_network_offset(skb), l3num,
- net, &tuple)) {
- pr_debug("ovs_ct_find_existing: Can't get tuple\n");
- return NULL;
- }
- /* Must invert the tuple if skb has been transformed by NAT. */
- if (natted) {
- struct nf_conntrack_tuple inverse;
- if (!nf_ct_invert_tuplepr(&inverse, &tuple)) {
- pr_debug("ovs_ct_find_existing: Inversion failed!\n");
- return NULL;
- }
- tuple = inverse;
- }
- /* look for tuple match */
- h = nf_conntrack_find_get(net, zone, &tuple);
- if (!h)
- return NULL; /* Not found. */
- ct = nf_ct_tuplehash_to_ctrack(h);
- /* Inverted packet tuple matches the reverse direction conntrack tuple,
- * select the other tuplehash to get the right 'ctinfo' bits for this
- * packet.
- */
- if (natted)
- h = &ct->tuplehash[!h->tuple.dst.dir];
- nf_ct_set(skb, ct, ovs_ct_get_info(h));
- return ct;
- }
- static
- struct nf_conn *ovs_ct_executed(struct net *net,
- const struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb,
- bool *ct_executed)
- {
- struct nf_conn *ct = NULL;
- /* If no ct, check if we have evidence that an existing conntrack entry
- * might be found for this skb. This happens when we lose a skb->_nfct
- * due to an upcall, or if the direction is being forced. If the
- * connection was not confirmed, it is not cached and needs to be run
- * through conntrack again.
- */
- *ct_executed = (key->ct_state & OVS_CS_F_TRACKED) &&
- !(key->ct_state & OVS_CS_F_INVALID) &&
- (key->ct_zone == info->zone.id);
- if (*ct_executed || (!key->ct_state && info->force)) {
- ct = ovs_ct_find_existing(net, &info->zone, info->family, skb,
- !!(key->ct_state &
- OVS_CS_F_NAT_MASK));
- }
- return ct;
- }
- /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
- static bool skb_nfct_cached(struct net *net,
- const struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb)
- {
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- bool ct_executed = true;
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- ct = ovs_ct_executed(net, key, info, skb, &ct_executed);
- if (ct)
- nf_ct_get(skb, &ctinfo);
- else
- return false;
- if (!net_eq(net, read_pnet(&ct->ct_net)))
- return false;
- if (!nf_ct_zone_equal_any(info->ct, nf_ct_zone(ct)))
- return false;
- if (info->helper) {
- struct nf_conn_help *help;
- help = nf_ct_ext_find(ct, NF_CT_EXT_HELPER);
- if (help && rcu_access_pointer(help->helper) != info->helper)
- return false;
- }
- /* Force conntrack entry direction to the current packet? */
- if (info->force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
- /* Delete the conntrack entry if confirmed, else just release
- * the reference.
- */
- if (nf_ct_is_confirmed(ct))
- nf_ct_delete(ct, 0, 0);
- nf_conntrack_put(&ct->ct_general);
- nf_ct_set(skb, NULL, 0);
- return false;
- }
- return ct_executed;
- }
- #ifdef CONFIG_NF_NAT_NEEDED
- /* Modelled after nf_nat_ipv[46]_fn().
- * range is only used for new, uninitialized NAT state.
- * Returns either NF_ACCEPT or NF_DROP.
- */
- static int ovs_ct_nat_execute(struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo,
- const struct nf_nat_range2 *range,
- enum nf_nat_manip_type maniptype)
- {
- int hooknum, nh_off, err = NF_ACCEPT;
- nh_off = skb_network_offset(skb);
- skb_pull_rcsum(skb, nh_off);
- /* See HOOK2MANIP(). */
- if (maniptype == NF_NAT_MANIP_SRC)
- hooknum = NF_INET_LOCAL_IN; /* Source NAT */
- else
- hooknum = NF_INET_LOCAL_OUT; /* Destination NAT */
- switch (ctinfo) {
- case IP_CT_RELATED:
- case IP_CT_RELATED_REPLY:
- if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
- skb->protocol == htons(ETH_P_IP) &&
- ip_hdr(skb)->protocol == IPPROTO_ICMP) {
- if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
- hooknum))
- err = NF_DROP;
- goto push;
- } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
- skb->protocol == htons(ETH_P_IPV6)) {
- __be16 frag_off;
- u8 nexthdr = ipv6_hdr(skb)->nexthdr;
- int hdrlen = ipv6_skip_exthdr(skb,
- sizeof(struct ipv6hdr),
- &nexthdr, &frag_off);
- if (hdrlen >= 0 && nexthdr == IPPROTO_ICMPV6) {
- if (!nf_nat_icmpv6_reply_translation(skb, ct,
- ctinfo,
- hooknum,
- hdrlen))
- err = NF_DROP;
- goto push;
- }
- }
- /* Non-ICMP, fall thru to initialize if needed. */
- /* fall through */
- case IP_CT_NEW:
- /* Seen it before? This can happen for loopback, retrans,
- * or local packets.
- */
- if (!nf_nat_initialized(ct, maniptype)) {
- /* Initialize according to the NAT action. */
- err = (range && range->flags & NF_NAT_RANGE_MAP_IPS)
- /* Action is set up to establish a new
- * mapping.
- */
- ? nf_nat_setup_info(ct, range, maniptype)
- : nf_nat_alloc_null_binding(ct, hooknum);
- if (err != NF_ACCEPT)
- goto push;
- }
- break;
- case IP_CT_ESTABLISHED:
- case IP_CT_ESTABLISHED_REPLY:
- break;
- default:
- err = NF_DROP;
- goto push;
- }
- err = nf_nat_packet(ct, ctinfo, hooknum, skb);
- push:
- skb_push(skb, nh_off);
- skb_postpush_rcsum(skb, skb->data, nh_off);
- return err;
- }
- static void ovs_nat_update_key(struct sw_flow_key *key,
- const struct sk_buff *skb,
- enum nf_nat_manip_type maniptype)
- {
- if (maniptype == NF_NAT_MANIP_SRC) {
- __be16 src;
- key->ct_state |= OVS_CS_F_SRC_NAT;
- if (key->eth.type == htons(ETH_P_IP))
- key->ipv4.addr.src = ip_hdr(skb)->saddr;
- else if (key->eth.type == htons(ETH_P_IPV6))
- memcpy(&key->ipv6.addr.src, &ipv6_hdr(skb)->saddr,
- sizeof(key->ipv6.addr.src));
- else
- return;
- if (key->ip.proto == IPPROTO_UDP)
- src = udp_hdr(skb)->source;
- else if (key->ip.proto == IPPROTO_TCP)
- src = tcp_hdr(skb)->source;
- else if (key->ip.proto == IPPROTO_SCTP)
- src = sctp_hdr(skb)->source;
- else
- return;
- key->tp.src = src;
- } else {
- __be16 dst;
- key->ct_state |= OVS_CS_F_DST_NAT;
- if (key->eth.type == htons(ETH_P_IP))
- key->ipv4.addr.dst = ip_hdr(skb)->daddr;
- else if (key->eth.type == htons(ETH_P_IPV6))
- memcpy(&key->ipv6.addr.dst, &ipv6_hdr(skb)->daddr,
- sizeof(key->ipv6.addr.dst));
- else
- return;
- if (key->ip.proto == IPPROTO_UDP)
- dst = udp_hdr(skb)->dest;
- else if (key->ip.proto == IPPROTO_TCP)
- dst = tcp_hdr(skb)->dest;
- else if (key->ip.proto == IPPROTO_SCTP)
- dst = sctp_hdr(skb)->dest;
- else
- return;
- key->tp.dst = dst;
- }
- }
- /* Returns NF_DROP if the packet should be dropped, NF_ACCEPT otherwise. */
- static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo)
- {
- enum nf_nat_manip_type maniptype;
- int err;
- /* Add NAT extension if not confirmed yet. */
- if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
- return NF_ACCEPT; /* Can't NAT. */
- /* Determine NAT type.
- * Check if the NAT type can be deduced from the tracked connection.
- * Make sure new expected connections (IP_CT_RELATED) are NATted only
- * when committing.
- */
- if (info->nat & OVS_CT_NAT && ctinfo != IP_CT_NEW &&
- ct->status & IPS_NAT_MASK &&
- (ctinfo != IP_CT_RELATED || info->commit)) {
- /* NAT an established or related connection like before. */
- if (CTINFO2DIR(ctinfo) == IP_CT_DIR_REPLY)
- /* This is the REPLY direction for a connection
- * for which NAT was applied in the forward
- * direction. Do the reverse NAT.
- */
- maniptype = ct->status & IPS_SRC_NAT
- ? NF_NAT_MANIP_DST : NF_NAT_MANIP_SRC;
- else
- maniptype = ct->status & IPS_SRC_NAT
- ? NF_NAT_MANIP_SRC : NF_NAT_MANIP_DST;
- } else if (info->nat & OVS_CT_SRC_NAT) {
- maniptype = NF_NAT_MANIP_SRC;
- } else if (info->nat & OVS_CT_DST_NAT) {
- maniptype = NF_NAT_MANIP_DST;
- } else {
- return NF_ACCEPT; /* Connection is not NATed. */
- }
- err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range, maniptype);
- if (err == NF_ACCEPT &&
- ct->status & IPS_SRC_NAT && ct->status & IPS_DST_NAT) {
- if (maniptype == NF_NAT_MANIP_SRC)
- maniptype = NF_NAT_MANIP_DST;
- else
- maniptype = NF_NAT_MANIP_SRC;
- err = ovs_ct_nat_execute(skb, ct, ctinfo, &info->range,
- maniptype);
- }
- /* Mark NAT done if successful and update the flow key. */
- if (err == NF_ACCEPT)
- ovs_nat_update_key(key, skb, maniptype);
- return err;
- }
- #else /* !CONFIG_NF_NAT_NEEDED */
- static int ovs_ct_nat(struct net *net, struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo)
- {
- return NF_ACCEPT;
- }
- #endif
- /* Pass 'skb' through conntrack in 'net', using zone configured in 'info', if
- * not done already. Update key with new CT state after passing the packet
- * through conntrack.
- * Note that if the packet is deemed invalid by conntrack, skb->_nfct will be
- * set to NULL and 0 will be returned.
- */
- static int __ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb)
- {
- /* If we are recirculating packets to match on conntrack fields and
- * committing with a separate conntrack action, then we don't need to
- * actually run the packet through conntrack twice unless it's for a
- * different zone.
- */
- bool cached = skb_nfct_cached(net, key, info, skb);
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- if (!cached) {
- struct nf_conn *tmpl = info->ct;
- int err;
- /* Associate skb with specified zone. */
- if (tmpl) {
- if (skb_nfct(skb))
- nf_conntrack_put(skb_nfct(skb));
- nf_conntrack_get(&tmpl->ct_general);
- nf_ct_set(skb, tmpl, IP_CT_NEW);
- }
- err = nf_conntrack_in(net, info->family,
- NF_INET_PRE_ROUTING, skb);
- if (err != NF_ACCEPT)
- return -ENOENT;
- /* Clear CT state NAT flags to mark that we have not yet done
- * NAT after the nf_conntrack_in() call. We can actually clear
- * the whole state, as it will be re-initialized below.
- */
- key->ct_state = 0;
- /* Update the key, but keep the NAT flags. */
- ovs_ct_update_key(skb, info, key, true, true);
- }
- ct = nf_ct_get(skb, &ctinfo);
- if (ct) {
- /* Packets starting a new connection must be NATted before the
- * helper, so that the helper knows about the NAT. We enforce
- * this by delaying both NAT and helper calls for unconfirmed
- * connections until the committing CT action. For later
- * packets NAT and Helper may be called in either order.
- *
- * NAT will be done only if the CT action has NAT, and only
- * once per packet (per zone), as guarded by the NAT bits in
- * the key->ct_state.
- */
- if (info->nat && !(key->ct_state & OVS_CS_F_NAT_MASK) &&
- (nf_ct_is_confirmed(ct) || info->commit) &&
- ovs_ct_nat(net, key, info, skb, ct, ctinfo) != NF_ACCEPT) {
- return -EINVAL;
- }
- /* Userspace may decide to perform a ct lookup without a helper
- * specified followed by a (recirculate and) commit with one.
- * Therefore, for unconfirmed connections which we will commit,
- * we need to attach the helper here.
- */
- if (!nf_ct_is_confirmed(ct) && info->commit &&
- info->helper && !nfct_help(ct)) {
- int err = __nf_ct_try_assign_helper(ct, info->ct,
- GFP_ATOMIC);
- if (err)
- return err;
- }
- /* Call the helper only if:
- * - nf_conntrack_in() was executed above ("!cached") for a
- * confirmed connection, or
- * - When committing an unconfirmed connection.
- */
- if ((nf_ct_is_confirmed(ct) ? !cached : info->commit) &&
- ovs_ct_helper(skb, info->family) != NF_ACCEPT) {
- return -EINVAL;
- }
- }
- return 0;
- }
- /* Lookup connection and read fields into key. */
- static int ovs_ct_lookup(struct net *net, struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb)
- {
- struct nf_conntrack_expect *exp;
- /* If we pass an expected packet through nf_conntrack_in() the
- * expectation is typically removed, but the packet could still be
- * lost in upcall processing. To prevent this from happening we
- * perform an explicit expectation lookup. Expected connections are
- * always new, and will be passed through conntrack only when they are
- * committed, as it is OK to remove the expectation at that time.
- */
- exp = ovs_ct_expect_find(net, &info->zone, info->family, skb);
- if (exp) {
- u8 state;
- /* NOTE: New connections are NATted and Helped only when
- * committed, so we are not calling into NAT here.
- */
- state = OVS_CS_F_TRACKED | OVS_CS_F_NEW | OVS_CS_F_RELATED;
- __ovs_ct_update_key(key, state, &info->zone, exp->master);
- } else {
- struct nf_conn *ct;
- int err;
- err = __ovs_ct_lookup(net, key, info, skb);
- if (err)
- return err;
- ct = (struct nf_conn *)skb_nfct(skb);
- if (ct)
- nf_ct_deliver_cached_events(ct);
- }
- return 0;
- }
- static bool labels_nonzero(const struct ovs_key_ct_labels *labels)
- {
- size_t i;
- for (i = 0; i < OVS_CT_LABELS_LEN_32; i++)
- if (labels->ct_labels_32[i])
- return true;
- return false;
- }
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- static struct hlist_head *ct_limit_hash_bucket(
- const struct ovs_ct_limit_info *info, u16 zone)
- {
- return &info->limits[zone & (CT_LIMIT_HASH_BUCKETS - 1)];
- }
- /* Call with ovs_mutex */
- static void ct_limit_set(const struct ovs_ct_limit_info *info,
- struct ovs_ct_limit *new_ct_limit)
- {
- struct ovs_ct_limit *ct_limit;
- struct hlist_head *head;
- head = ct_limit_hash_bucket(info, new_ct_limit->zone);
- hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
- if (ct_limit->zone == new_ct_limit->zone) {
- hlist_replace_rcu(&ct_limit->hlist_node,
- &new_ct_limit->hlist_node);
- kfree_rcu(ct_limit, rcu);
- return;
- }
- }
- hlist_add_head_rcu(&new_ct_limit->hlist_node, head);
- }
- /* Call with ovs_mutex */
- static void ct_limit_del(const struct ovs_ct_limit_info *info, u16 zone)
- {
- struct ovs_ct_limit *ct_limit;
- struct hlist_head *head;
- struct hlist_node *n;
- head = ct_limit_hash_bucket(info, zone);
- hlist_for_each_entry_safe(ct_limit, n, head, hlist_node) {
- if (ct_limit->zone == zone) {
- hlist_del_rcu(&ct_limit->hlist_node);
- kfree_rcu(ct_limit, rcu);
- return;
- }
- }
- }
- /* Call with RCU read lock */
- static u32 ct_limit_get(const struct ovs_ct_limit_info *info, u16 zone)
- {
- struct ovs_ct_limit *ct_limit;
- struct hlist_head *head;
- head = ct_limit_hash_bucket(info, zone);
- hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
- if (ct_limit->zone == zone)
- return ct_limit->limit;
- }
- return info->default_limit;
- }
- static int ovs_ct_check_limit(struct net *net,
- const struct ovs_conntrack_info *info,
- const struct nf_conntrack_tuple *tuple)
- {
- struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
- const struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
- u32 per_zone_limit, connections;
- u32 conncount_key;
- conncount_key = info->zone.id;
- per_zone_limit = ct_limit_get(ct_limit_info, info->zone.id);
- if (per_zone_limit == OVS_CT_LIMIT_UNLIMITED)
- return 0;
- connections = nf_conncount_count(net, ct_limit_info->data,
- &conncount_key, tuple, &info->zone);
- if (connections > per_zone_limit)
- return -ENOMEM;
- return 0;
- }
- #endif
- /* Lookup connection and confirm if unconfirmed. */
- static int ovs_ct_commit(struct net *net, struct sw_flow_key *key,
- const struct ovs_conntrack_info *info,
- struct sk_buff *skb)
- {
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- int err;
- err = __ovs_ct_lookup(net, key, info, skb);
- if (err)
- return err;
- /* The connection could be invalid, in which case this is a no-op.*/
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- return 0;
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- if (static_branch_unlikely(&ovs_ct_limit_enabled)) {
- if (!nf_ct_is_confirmed(ct)) {
- err = ovs_ct_check_limit(net, info,
- &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple);
- if (err) {
- net_warn_ratelimited("openvswitch: zone: %u "
- "execeeds conntrack limit\n",
- info->zone.id);
- return err;
- }
- }
- }
- #endif
- /* Set the conntrack event mask if given. NEW and DELETE events have
- * their own groups, but the NFNLGRP_CONNTRACK_UPDATE group listener
- * typically would receive many kinds of updates. Setting the event
- * mask allows those events to be filtered. The set event mask will
- * remain in effect for the lifetime of the connection unless changed
- * by a further CT action with both the commit flag and the eventmask
- * option. */
- if (info->have_eventmask) {
- struct nf_conntrack_ecache *cache = nf_ct_ecache_find(ct);
- if (cache)
- cache->ctmask = info->eventmask;
- }
- /* Apply changes before confirming the connection so that the initial
- * conntrack NEW netlink event carries the values given in the CT
- * action.
- */
- if (info->mark.mask) {
- err = ovs_ct_set_mark(ct, key, info->mark.value,
- info->mark.mask);
- if (err)
- return err;
- }
- if (!nf_ct_is_confirmed(ct)) {
- err = ovs_ct_init_labels(ct, key, &info->labels.value,
- &info->labels.mask);
- if (err)
- return err;
- } else if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
- labels_nonzero(&info->labels.mask)) {
- err = ovs_ct_set_labels(ct, key, &info->labels.value,
- &info->labels.mask);
- if (err)
- return err;
- }
- /* This will take care of sending queued events even if the connection
- * is already confirmed.
- */
- if (nf_conntrack_confirm(skb) != NF_ACCEPT)
- return -EINVAL;
- return 0;
- }
- /* Trim the skb to the length specified by the IP/IPv6 header,
- * removing any trailing lower-layer padding. This prepares the skb
- * for higher-layer processing that assumes skb->len excludes padding
- * (such as nf_ip_checksum). The caller needs to pull the skb to the
- * network header, and ensure ip_hdr/ipv6_hdr points to valid data.
- */
- static int ovs_skb_network_trim(struct sk_buff *skb)
- {
- unsigned int len;
- int err;
- switch (skb->protocol) {
- case htons(ETH_P_IP):
- len = ntohs(ip_hdr(skb)->tot_len);
- break;
- case htons(ETH_P_IPV6):
- len = sizeof(struct ipv6hdr)
- + ntohs(ipv6_hdr(skb)->payload_len);
- break;
- default:
- len = skb->len;
- }
- err = pskb_trim_rcsum(skb, len);
- if (err)
- kfree_skb(skb);
- return err;
- }
- /* Returns 0 on success, -EINPROGRESS if 'skb' is stolen, or other nonzero
- * value if 'skb' is freed.
- */
- int ovs_ct_execute(struct net *net, struct sk_buff *skb,
- struct sw_flow_key *key,
- const struct ovs_conntrack_info *info)
- {
- int nh_ofs;
- int err;
- /* The conntrack module expects to be working at L3. */
- nh_ofs = skb_network_offset(skb);
- skb_pull_rcsum(skb, nh_ofs);
- err = ovs_skb_network_trim(skb);
- if (err)
- return err;
- if (key->ip.frag != OVS_FRAG_TYPE_NONE) {
- err = handle_fragments(net, key, info->zone.id, skb);
- if (err)
- return err;
- }
- if (info->commit)
- err = ovs_ct_commit(net, key, info, skb);
- else
- err = ovs_ct_lookup(net, key, info, skb);
- skb_push(skb, nh_ofs);
- skb_postpush_rcsum(skb, skb->data, nh_ofs);
- if (err)
- kfree_skb(skb);
- return err;
- }
- int ovs_ct_clear(struct sk_buff *skb, struct sw_flow_key *key)
- {
- if (skb_nfct(skb)) {
- nf_conntrack_put(skb_nfct(skb));
- nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
- ovs_ct_fill_key(skb, key);
- }
- return 0;
- }
- static int ovs_ct_add_helper(struct ovs_conntrack_info *info, const char *name,
- const struct sw_flow_key *key, bool log)
- {
- struct nf_conntrack_helper *helper;
- struct nf_conn_help *help;
- helper = nf_conntrack_helper_try_module_get(name, info->family,
- key->ip.proto);
- if (!helper) {
- OVS_NLERR(log, "Unknown helper \"%s\"", name);
- return -EINVAL;
- }
- help = nf_ct_helper_ext_add(info->ct, GFP_KERNEL);
- if (!help) {
- nf_conntrack_helper_put(helper);
- return -ENOMEM;
- }
- rcu_assign_pointer(help->helper, helper);
- info->helper = helper;
- if (info->nat)
- request_module("ip_nat_%s", name);
- return 0;
- }
- #ifdef CONFIG_NF_NAT_NEEDED
- static int parse_nat(const struct nlattr *attr,
- struct ovs_conntrack_info *info, bool log)
- {
- struct nlattr *a;
- int rem;
- bool have_ip_max = false;
- bool have_proto_max = false;
- bool ip_vers = (info->family == NFPROTO_IPV6);
- nla_for_each_nested(a, attr, rem) {
- static const int ovs_nat_attr_lens[OVS_NAT_ATTR_MAX + 1][2] = {
- [OVS_NAT_ATTR_SRC] = {0, 0},
- [OVS_NAT_ATTR_DST] = {0, 0},
- [OVS_NAT_ATTR_IP_MIN] = {sizeof(struct in_addr),
- sizeof(struct in6_addr)},
- [OVS_NAT_ATTR_IP_MAX] = {sizeof(struct in_addr),
- sizeof(struct in6_addr)},
- [OVS_NAT_ATTR_PROTO_MIN] = {sizeof(u16), sizeof(u16)},
- [OVS_NAT_ATTR_PROTO_MAX] = {sizeof(u16), sizeof(u16)},
- [OVS_NAT_ATTR_PERSISTENT] = {0, 0},
- [OVS_NAT_ATTR_PROTO_HASH] = {0, 0},
- [OVS_NAT_ATTR_PROTO_RANDOM] = {0, 0},
- };
- int type = nla_type(a);
- if (type > OVS_NAT_ATTR_MAX) {
- OVS_NLERR(log, "Unknown NAT attribute (type=%d, max=%d)",
- type, OVS_NAT_ATTR_MAX);
- return -EINVAL;
- }
- if (nla_len(a) != ovs_nat_attr_lens[type][ip_vers]) {
- OVS_NLERR(log, "NAT attribute type %d has unexpected length (%d != %d)",
- type, nla_len(a),
- ovs_nat_attr_lens[type][ip_vers]);
- return -EINVAL;
- }
- switch (type) {
- case OVS_NAT_ATTR_SRC:
- case OVS_NAT_ATTR_DST:
- if (info->nat) {
- OVS_NLERR(log, "Only one type of NAT may be specified");
- return -ERANGE;
- }
- info->nat |= OVS_CT_NAT;
- info->nat |= ((type == OVS_NAT_ATTR_SRC)
- ? OVS_CT_SRC_NAT : OVS_CT_DST_NAT);
- break;
- case OVS_NAT_ATTR_IP_MIN:
- nla_memcpy(&info->range.min_addr, a,
- sizeof(info->range.min_addr));
- info->range.flags |= NF_NAT_RANGE_MAP_IPS;
- break;
- case OVS_NAT_ATTR_IP_MAX:
- have_ip_max = true;
- nla_memcpy(&info->range.max_addr, a,
- sizeof(info->range.max_addr));
- info->range.flags |= NF_NAT_RANGE_MAP_IPS;
- break;
- case OVS_NAT_ATTR_PROTO_MIN:
- info->range.min_proto.all = htons(nla_get_u16(a));
- info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
- break;
- case OVS_NAT_ATTR_PROTO_MAX:
- have_proto_max = true;
- info->range.max_proto.all = htons(nla_get_u16(a));
- info->range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
- break;
- case OVS_NAT_ATTR_PERSISTENT:
- info->range.flags |= NF_NAT_RANGE_PERSISTENT;
- break;
- case OVS_NAT_ATTR_PROTO_HASH:
- info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM;
- break;
- case OVS_NAT_ATTR_PROTO_RANDOM:
- info->range.flags |= NF_NAT_RANGE_PROTO_RANDOM_FULLY;
- break;
- default:
- OVS_NLERR(log, "Unknown nat attribute (%d)", type);
- return -EINVAL;
- }
- }
- if (rem > 0) {
- OVS_NLERR(log, "NAT attribute has %d unknown bytes", rem);
- return -EINVAL;
- }
- if (!info->nat) {
- /* Do not allow flags if no type is given. */
- if (info->range.flags) {
- OVS_NLERR(log,
- "NAT flags may be given only when NAT range (SRC or DST) is also specified."
- );
- return -EINVAL;
- }
- info->nat = OVS_CT_NAT; /* NAT existing connections. */
- } else if (!info->commit) {
- OVS_NLERR(log,
- "NAT attributes may be specified only when CT COMMIT flag is also specified."
- );
- return -EINVAL;
- }
- /* Allow missing IP_MAX. */
- if (info->range.flags & NF_NAT_RANGE_MAP_IPS && !have_ip_max) {
- memcpy(&info->range.max_addr, &info->range.min_addr,
- sizeof(info->range.max_addr));
- }
- /* Allow missing PROTO_MAX. */
- if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
- !have_proto_max) {
- info->range.max_proto.all = info->range.min_proto.all;
- }
- return 0;
- }
- #endif
- static const struct ovs_ct_len_tbl ovs_ct_attr_lens[OVS_CT_ATTR_MAX + 1] = {
- [OVS_CT_ATTR_COMMIT] = { .minlen = 0, .maxlen = 0 },
- [OVS_CT_ATTR_FORCE_COMMIT] = { .minlen = 0, .maxlen = 0 },
- [OVS_CT_ATTR_ZONE] = { .minlen = sizeof(u16),
- .maxlen = sizeof(u16) },
- [OVS_CT_ATTR_MARK] = { .minlen = sizeof(struct md_mark),
- .maxlen = sizeof(struct md_mark) },
- [OVS_CT_ATTR_LABELS] = { .minlen = sizeof(struct md_labels),
- .maxlen = sizeof(struct md_labels) },
- [OVS_CT_ATTR_HELPER] = { .minlen = 1,
- .maxlen = NF_CT_HELPER_NAME_LEN },
- #ifdef CONFIG_NF_NAT_NEEDED
- /* NAT length is checked when parsing the nested attributes. */
- [OVS_CT_ATTR_NAT] = { .minlen = 0, .maxlen = INT_MAX },
- #endif
- [OVS_CT_ATTR_EVENTMASK] = { .minlen = sizeof(u32),
- .maxlen = sizeof(u32) },
- };
- static int parse_ct(const struct nlattr *attr, struct ovs_conntrack_info *info,
- const char **helper, bool log)
- {
- struct nlattr *a;
- int rem;
- nla_for_each_nested(a, attr, rem) {
- int type = nla_type(a);
- int maxlen;
- int minlen;
- if (type > OVS_CT_ATTR_MAX) {
- OVS_NLERR(log,
- "Unknown conntrack attr (type=%d, max=%d)",
- type, OVS_CT_ATTR_MAX);
- return -EINVAL;
- }
- maxlen = ovs_ct_attr_lens[type].maxlen;
- minlen = ovs_ct_attr_lens[type].minlen;
- if (nla_len(a) < minlen || nla_len(a) > maxlen) {
- OVS_NLERR(log,
- "Conntrack attr type has unexpected length (type=%d, length=%d, expected=%d)",
- type, nla_len(a), maxlen);
- return -EINVAL;
- }
- switch (type) {
- case OVS_CT_ATTR_FORCE_COMMIT:
- info->force = true;
- /* fall through. */
- case OVS_CT_ATTR_COMMIT:
- info->commit = true;
- break;
- #ifdef CONFIG_NF_CONNTRACK_ZONES
- case OVS_CT_ATTR_ZONE:
- info->zone.id = nla_get_u16(a);
- break;
- #endif
- #ifdef CONFIG_NF_CONNTRACK_MARK
- case OVS_CT_ATTR_MARK: {
- struct md_mark *mark = nla_data(a);
- if (!mark->mask) {
- OVS_NLERR(log, "ct_mark mask cannot be 0");
- return -EINVAL;
- }
- info->mark = *mark;
- break;
- }
- #endif
- #ifdef CONFIG_NF_CONNTRACK_LABELS
- case OVS_CT_ATTR_LABELS: {
- struct md_labels *labels = nla_data(a);
- if (!labels_nonzero(&labels->mask)) {
- OVS_NLERR(log, "ct_labels mask cannot be 0");
- return -EINVAL;
- }
- info->labels = *labels;
- break;
- }
- #endif
- case OVS_CT_ATTR_HELPER:
- *helper = nla_data(a);
- if (!memchr(*helper, '\0', nla_len(a))) {
- OVS_NLERR(log, "Invalid conntrack helper");
- return -EINVAL;
- }
- break;
- #ifdef CONFIG_NF_NAT_NEEDED
- case OVS_CT_ATTR_NAT: {
- int err = parse_nat(a, info, log);
- if (err)
- return err;
- break;
- }
- #endif
- case OVS_CT_ATTR_EVENTMASK:
- info->have_eventmask = true;
- info->eventmask = nla_get_u32(a);
- break;
- default:
- OVS_NLERR(log, "Unknown conntrack attr (%d)",
- type);
- return -EINVAL;
- }
- }
- #ifdef CONFIG_NF_CONNTRACK_MARK
- if (!info->commit && info->mark.mask) {
- OVS_NLERR(log,
- "Setting conntrack mark requires 'commit' flag.");
- return -EINVAL;
- }
- #endif
- #ifdef CONFIG_NF_CONNTRACK_LABELS
- if (!info->commit && labels_nonzero(&info->labels.mask)) {
- OVS_NLERR(log,
- "Setting conntrack labels requires 'commit' flag.");
- return -EINVAL;
- }
- #endif
- if (rem > 0) {
- OVS_NLERR(log, "Conntrack attr has %d unknown bytes", rem);
- return -EINVAL;
- }
- return 0;
- }
- bool ovs_ct_verify(struct net *net, enum ovs_key_attr attr)
- {
- if (attr == OVS_KEY_ATTR_CT_STATE)
- return true;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
- attr == OVS_KEY_ATTR_CT_ZONE)
- return true;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
- attr == OVS_KEY_ATTR_CT_MARK)
- return true;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
- attr == OVS_KEY_ATTR_CT_LABELS) {
- struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
- return ovs_net->xt_label;
- }
- return false;
- }
- int ovs_ct_copy_action(struct net *net, const struct nlattr *attr,
- const struct sw_flow_key *key,
- struct sw_flow_actions **sfa, bool log)
- {
- struct ovs_conntrack_info ct_info;
- const char *helper = NULL;
- u16 family;
- int err;
- family = key_to_nfproto(key);
- if (family == NFPROTO_UNSPEC) {
- OVS_NLERR(log, "ct family unspecified");
- return -EINVAL;
- }
- memset(&ct_info, 0, sizeof(ct_info));
- ct_info.family = family;
- nf_ct_zone_init(&ct_info.zone, NF_CT_DEFAULT_ZONE_ID,
- NF_CT_DEFAULT_ZONE_DIR, 0);
- err = parse_ct(attr, &ct_info, &helper, log);
- if (err)
- return err;
- /* Set up template for tracking connections in specific zones. */
- ct_info.ct = nf_ct_tmpl_alloc(net, &ct_info.zone, GFP_KERNEL);
- if (!ct_info.ct) {
- OVS_NLERR(log, "Failed to allocate conntrack template");
- return -ENOMEM;
- }
- if (helper) {
- err = ovs_ct_add_helper(&ct_info, helper, key, log);
- if (err)
- goto err_free_ct;
- }
- err = ovs_nla_add_action(sfa, OVS_ACTION_ATTR_CT, &ct_info,
- sizeof(ct_info), log);
- if (err)
- goto err_free_ct;
- __set_bit(IPS_CONFIRMED_BIT, &ct_info.ct->status);
- nf_conntrack_get(&ct_info.ct->ct_general);
- return 0;
- err_free_ct:
- __ovs_ct_free_action(&ct_info);
- return err;
- }
- #ifdef CONFIG_NF_NAT_NEEDED
- static bool ovs_ct_nat_to_attr(const struct ovs_conntrack_info *info,
- struct sk_buff *skb)
- {
- struct nlattr *start;
- start = nla_nest_start(skb, OVS_CT_ATTR_NAT);
- if (!start)
- return false;
- if (info->nat & OVS_CT_SRC_NAT) {
- if (nla_put_flag(skb, OVS_NAT_ATTR_SRC))
- return false;
- } else if (info->nat & OVS_CT_DST_NAT) {
- if (nla_put_flag(skb, OVS_NAT_ATTR_DST))
- return false;
- } else {
- goto out;
- }
- if (info->range.flags & NF_NAT_RANGE_MAP_IPS) {
- if (IS_ENABLED(CONFIG_NF_NAT_IPV4) &&
- info->family == NFPROTO_IPV4) {
- if (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MIN,
- info->range.min_addr.ip) ||
- (info->range.max_addr.ip
- != info->range.min_addr.ip &&
- (nla_put_in_addr(skb, OVS_NAT_ATTR_IP_MAX,
- info->range.max_addr.ip))))
- return false;
- } else if (IS_ENABLED(CONFIG_NF_NAT_IPV6) &&
- info->family == NFPROTO_IPV6) {
- if (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MIN,
- &info->range.min_addr.in6) ||
- (memcmp(&info->range.max_addr.in6,
- &info->range.min_addr.in6,
- sizeof(info->range.max_addr.in6)) &&
- (nla_put_in6_addr(skb, OVS_NAT_ATTR_IP_MAX,
- &info->range.max_addr.in6))))
- return false;
- } else {
- return false;
- }
- }
- if (info->range.flags & NF_NAT_RANGE_PROTO_SPECIFIED &&
- (nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MIN,
- ntohs(info->range.min_proto.all)) ||
- (info->range.max_proto.all != info->range.min_proto.all &&
- nla_put_u16(skb, OVS_NAT_ATTR_PROTO_MAX,
- ntohs(info->range.max_proto.all)))))
- return false;
- if (info->range.flags & NF_NAT_RANGE_PERSISTENT &&
- nla_put_flag(skb, OVS_NAT_ATTR_PERSISTENT))
- return false;
- if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM &&
- nla_put_flag(skb, OVS_NAT_ATTR_PROTO_HASH))
- return false;
- if (info->range.flags & NF_NAT_RANGE_PROTO_RANDOM_FULLY &&
- nla_put_flag(skb, OVS_NAT_ATTR_PROTO_RANDOM))
- return false;
- out:
- nla_nest_end(skb, start);
- return true;
- }
- #endif
- int ovs_ct_action_to_attr(const struct ovs_conntrack_info *ct_info,
- struct sk_buff *skb)
- {
- struct nlattr *start;
- start = nla_nest_start(skb, OVS_ACTION_ATTR_CT);
- if (!start)
- return -EMSGSIZE;
- if (ct_info->commit && nla_put_flag(skb, ct_info->force
- ? OVS_CT_ATTR_FORCE_COMMIT
- : OVS_CT_ATTR_COMMIT))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
- nla_put_u16(skb, OVS_CT_ATTR_ZONE, ct_info->zone.id))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) && ct_info->mark.mask &&
- nla_put(skb, OVS_CT_ATTR_MARK, sizeof(ct_info->mark),
- &ct_info->mark))
- return -EMSGSIZE;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
- labels_nonzero(&ct_info->labels.mask) &&
- nla_put(skb, OVS_CT_ATTR_LABELS, sizeof(ct_info->labels),
- &ct_info->labels))
- return -EMSGSIZE;
- if (ct_info->helper) {
- if (nla_put_string(skb, OVS_CT_ATTR_HELPER,
- ct_info->helper->name))
- return -EMSGSIZE;
- }
- if (ct_info->have_eventmask &&
- nla_put_u32(skb, OVS_CT_ATTR_EVENTMASK, ct_info->eventmask))
- return -EMSGSIZE;
- #ifdef CONFIG_NF_NAT_NEEDED
- if (ct_info->nat && !ovs_ct_nat_to_attr(ct_info, skb))
- return -EMSGSIZE;
- #endif
- nla_nest_end(skb, start);
- return 0;
- }
- void ovs_ct_free_action(const struct nlattr *a)
- {
- struct ovs_conntrack_info *ct_info = nla_data(a);
- __ovs_ct_free_action(ct_info);
- }
- static void __ovs_ct_free_action(struct ovs_conntrack_info *ct_info)
- {
- if (ct_info->helper)
- nf_conntrack_helper_put(ct_info->helper);
- if (ct_info->ct)
- nf_ct_tmpl_free(ct_info->ct);
- }
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- static int ovs_ct_limit_init(struct net *net, struct ovs_net *ovs_net)
- {
- int i, err;
- ovs_net->ct_limit_info = kmalloc(sizeof(*ovs_net->ct_limit_info),
- GFP_KERNEL);
- if (!ovs_net->ct_limit_info)
- return -ENOMEM;
- ovs_net->ct_limit_info->default_limit = OVS_CT_LIMIT_DEFAULT;
- ovs_net->ct_limit_info->limits =
- kmalloc_array(CT_LIMIT_HASH_BUCKETS, sizeof(struct hlist_head),
- GFP_KERNEL);
- if (!ovs_net->ct_limit_info->limits) {
- kfree(ovs_net->ct_limit_info);
- return -ENOMEM;
- }
- for (i = 0; i < CT_LIMIT_HASH_BUCKETS; i++)
- INIT_HLIST_HEAD(&ovs_net->ct_limit_info->limits[i]);
- ovs_net->ct_limit_info->data =
- nf_conncount_init(net, NFPROTO_INET, sizeof(u32));
- if (IS_ERR(ovs_net->ct_limit_info->data)) {
- err = PTR_ERR(ovs_net->ct_limit_info->data);
- kfree(ovs_net->ct_limit_info->limits);
- kfree(ovs_net->ct_limit_info);
- pr_err("openvswitch: failed to init nf_conncount %d\n", err);
- return err;
- }
- return 0;
- }
- static void ovs_ct_limit_exit(struct net *net, struct ovs_net *ovs_net)
- {
- const struct ovs_ct_limit_info *info = ovs_net->ct_limit_info;
- int i;
- nf_conncount_destroy(net, NFPROTO_INET, info->data);
- for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
- struct hlist_head *head = &info->limits[i];
- struct ovs_ct_limit *ct_limit;
- hlist_for_each_entry_rcu(ct_limit, head, hlist_node)
- kfree_rcu(ct_limit, rcu);
- }
- kfree(ovs_net->ct_limit_info->limits);
- kfree(ovs_net->ct_limit_info);
- }
- static struct sk_buff *
- ovs_ct_limit_cmd_reply_start(struct genl_info *info, u8 cmd,
- struct ovs_header **ovs_reply_header)
- {
- struct ovs_header *ovs_header = info->userhdr;
- struct sk_buff *skb;
- skb = genlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (!skb)
- return ERR_PTR(-ENOMEM);
- *ovs_reply_header = genlmsg_put(skb, info->snd_portid,
- info->snd_seq,
- &dp_ct_limit_genl_family, 0, cmd);
- if (!*ovs_reply_header) {
- nlmsg_free(skb);
- return ERR_PTR(-EMSGSIZE);
- }
- (*ovs_reply_header)->dp_ifindex = ovs_header->dp_ifindex;
- return skb;
- }
- static bool check_zone_id(int zone_id, u16 *pzone)
- {
- if (zone_id >= 0 && zone_id <= 65535) {
- *pzone = (u16)zone_id;
- return true;
- }
- return false;
- }
- static int ovs_ct_limit_set_zone_limit(struct nlattr *nla_zone_limit,
- struct ovs_ct_limit_info *info)
- {
- struct ovs_zone_limit *zone_limit;
- int rem;
- u16 zone;
- rem = NLA_ALIGN(nla_len(nla_zone_limit));
- zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
- while (rem >= sizeof(*zone_limit)) {
- if (unlikely(zone_limit->zone_id ==
- OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
- ovs_lock();
- info->default_limit = zone_limit->limit;
- ovs_unlock();
- } else if (unlikely(!check_zone_id(
- zone_limit->zone_id, &zone))) {
- OVS_NLERR(true, "zone id is out of range");
- } else {
- struct ovs_ct_limit *ct_limit;
- ct_limit = kmalloc(sizeof(*ct_limit), GFP_KERNEL);
- if (!ct_limit)
- return -ENOMEM;
- ct_limit->zone = zone;
- ct_limit->limit = zone_limit->limit;
- ovs_lock();
- ct_limit_set(info, ct_limit);
- ovs_unlock();
- }
- rem -= NLA_ALIGN(sizeof(*zone_limit));
- zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
- NLA_ALIGN(sizeof(*zone_limit)));
- }
- if (rem)
- OVS_NLERR(true, "set zone limit has %d unknown bytes", rem);
- return 0;
- }
- static int ovs_ct_limit_del_zone_limit(struct nlattr *nla_zone_limit,
- struct ovs_ct_limit_info *info)
- {
- struct ovs_zone_limit *zone_limit;
- int rem;
- u16 zone;
- rem = NLA_ALIGN(nla_len(nla_zone_limit));
- zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
- while (rem >= sizeof(*zone_limit)) {
- if (unlikely(zone_limit->zone_id ==
- OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
- ovs_lock();
- info->default_limit = OVS_CT_LIMIT_DEFAULT;
- ovs_unlock();
- } else if (unlikely(!check_zone_id(
- zone_limit->zone_id, &zone))) {
- OVS_NLERR(true, "zone id is out of range");
- } else {
- ovs_lock();
- ct_limit_del(info, zone);
- ovs_unlock();
- }
- rem -= NLA_ALIGN(sizeof(*zone_limit));
- zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
- NLA_ALIGN(sizeof(*zone_limit)));
- }
- if (rem)
- OVS_NLERR(true, "del zone limit has %d unknown bytes", rem);
- return 0;
- }
- static int ovs_ct_limit_get_default_limit(struct ovs_ct_limit_info *info,
- struct sk_buff *reply)
- {
- struct ovs_zone_limit zone_limit;
- int err;
- zone_limit.zone_id = OVS_ZONE_LIMIT_DEFAULT_ZONE;
- zone_limit.limit = info->default_limit;
- err = nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
- if (err)
- return err;
- return 0;
- }
- static int __ovs_ct_limit_get_zone_limit(struct net *net,
- struct nf_conncount_data *data,
- u16 zone_id, u32 limit,
- struct sk_buff *reply)
- {
- struct nf_conntrack_zone ct_zone;
- struct ovs_zone_limit zone_limit;
- u32 conncount_key = zone_id;
- zone_limit.zone_id = zone_id;
- zone_limit.limit = limit;
- nf_ct_zone_init(&ct_zone, zone_id, NF_CT_DEFAULT_ZONE_DIR, 0);
- zone_limit.count = nf_conncount_count(net, data, &conncount_key, NULL,
- &ct_zone);
- return nla_put_nohdr(reply, sizeof(zone_limit), &zone_limit);
- }
- static int ovs_ct_limit_get_zone_limit(struct net *net,
- struct nlattr *nla_zone_limit,
- struct ovs_ct_limit_info *info,
- struct sk_buff *reply)
- {
- struct ovs_zone_limit *zone_limit;
- int rem, err;
- u32 limit;
- u16 zone;
- rem = NLA_ALIGN(nla_len(nla_zone_limit));
- zone_limit = (struct ovs_zone_limit *)nla_data(nla_zone_limit);
- while (rem >= sizeof(*zone_limit)) {
- if (unlikely(zone_limit->zone_id ==
- OVS_ZONE_LIMIT_DEFAULT_ZONE)) {
- err = ovs_ct_limit_get_default_limit(info, reply);
- if (err)
- return err;
- } else if (unlikely(!check_zone_id(zone_limit->zone_id,
- &zone))) {
- OVS_NLERR(true, "zone id is out of range");
- } else {
- rcu_read_lock();
- limit = ct_limit_get(info, zone);
- rcu_read_unlock();
- err = __ovs_ct_limit_get_zone_limit(
- net, info->data, zone, limit, reply);
- if (err)
- return err;
- }
- rem -= NLA_ALIGN(sizeof(*zone_limit));
- zone_limit = (struct ovs_zone_limit *)((u8 *)zone_limit +
- NLA_ALIGN(sizeof(*zone_limit)));
- }
- if (rem)
- OVS_NLERR(true, "get zone limit has %d unknown bytes", rem);
- return 0;
- }
- static int ovs_ct_limit_get_all_zone_limit(struct net *net,
- struct ovs_ct_limit_info *info,
- struct sk_buff *reply)
- {
- struct ovs_ct_limit *ct_limit;
- struct hlist_head *head;
- int i, err = 0;
- err = ovs_ct_limit_get_default_limit(info, reply);
- if (err)
- return err;
- rcu_read_lock();
- for (i = 0; i < CT_LIMIT_HASH_BUCKETS; ++i) {
- head = &info->limits[i];
- hlist_for_each_entry_rcu(ct_limit, head, hlist_node) {
- err = __ovs_ct_limit_get_zone_limit(net, info->data,
- ct_limit->zone, ct_limit->limit, reply);
- if (err)
- goto exit_err;
- }
- }
- exit_err:
- rcu_read_unlock();
- return err;
- }
- static int ovs_ct_limit_cmd_set(struct sk_buff *skb, struct genl_info *info)
- {
- struct nlattr **a = info->attrs;
- struct sk_buff *reply;
- struct ovs_header *ovs_reply_header;
- struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
- struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
- int err;
- reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_SET,
- &ovs_reply_header);
- if (IS_ERR(reply))
- return PTR_ERR(reply);
- if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
- err = -EINVAL;
- goto exit_err;
- }
- err = ovs_ct_limit_set_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
- ct_limit_info);
- if (err)
- goto exit_err;
- static_branch_enable(&ovs_ct_limit_enabled);
- genlmsg_end(reply, ovs_reply_header);
- return genlmsg_reply(reply, info);
- exit_err:
- nlmsg_free(reply);
- return err;
- }
- static int ovs_ct_limit_cmd_del(struct sk_buff *skb, struct genl_info *info)
- {
- struct nlattr **a = info->attrs;
- struct sk_buff *reply;
- struct ovs_header *ovs_reply_header;
- struct ovs_net *ovs_net = net_generic(sock_net(skb->sk), ovs_net_id);
- struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
- int err;
- reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_DEL,
- &ovs_reply_header);
- if (IS_ERR(reply))
- return PTR_ERR(reply);
- if (!a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
- err = -EINVAL;
- goto exit_err;
- }
- err = ovs_ct_limit_del_zone_limit(a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT],
- ct_limit_info);
- if (err)
- goto exit_err;
- genlmsg_end(reply, ovs_reply_header);
- return genlmsg_reply(reply, info);
- exit_err:
- nlmsg_free(reply);
- return err;
- }
- static int ovs_ct_limit_cmd_get(struct sk_buff *skb, struct genl_info *info)
- {
- struct nlattr **a = info->attrs;
- struct nlattr *nla_reply;
- struct sk_buff *reply;
- struct ovs_header *ovs_reply_header;
- struct net *net = sock_net(skb->sk);
- struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
- struct ovs_ct_limit_info *ct_limit_info = ovs_net->ct_limit_info;
- int err;
- reply = ovs_ct_limit_cmd_reply_start(info, OVS_CT_LIMIT_CMD_GET,
- &ovs_reply_header);
- if (IS_ERR(reply))
- return PTR_ERR(reply);
- nla_reply = nla_nest_start(reply, OVS_CT_LIMIT_ATTR_ZONE_LIMIT);
- if (a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT]) {
- err = ovs_ct_limit_get_zone_limit(
- net, a[OVS_CT_LIMIT_ATTR_ZONE_LIMIT], ct_limit_info,
- reply);
- if (err)
- goto exit_err;
- } else {
- err = ovs_ct_limit_get_all_zone_limit(net, ct_limit_info,
- reply);
- if (err)
- goto exit_err;
- }
- nla_nest_end(reply, nla_reply);
- genlmsg_end(reply, ovs_reply_header);
- return genlmsg_reply(reply, info);
- exit_err:
- nlmsg_free(reply);
- return err;
- }
- static struct genl_ops ct_limit_genl_ops[] = {
- { .cmd = OVS_CT_LIMIT_CMD_SET,
- .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
- * privilege. */
- .policy = ct_limit_policy,
- .doit = ovs_ct_limit_cmd_set,
- },
- { .cmd = OVS_CT_LIMIT_CMD_DEL,
- .flags = GENL_ADMIN_PERM, /* Requires CAP_NET_ADMIN
- * privilege. */
- .policy = ct_limit_policy,
- .doit = ovs_ct_limit_cmd_del,
- },
- { .cmd = OVS_CT_LIMIT_CMD_GET,
- .flags = 0, /* OK for unprivileged users. */
- .policy = ct_limit_policy,
- .doit = ovs_ct_limit_cmd_get,
- },
- };
- static const struct genl_multicast_group ovs_ct_limit_multicast_group = {
- .name = OVS_CT_LIMIT_MCGROUP,
- };
- struct genl_family dp_ct_limit_genl_family __ro_after_init = {
- .hdrsize = sizeof(struct ovs_header),
- .name = OVS_CT_LIMIT_FAMILY,
- .version = OVS_CT_LIMIT_VERSION,
- .maxattr = OVS_CT_LIMIT_ATTR_MAX,
- .netnsok = true,
- .parallel_ops = true,
- .ops = ct_limit_genl_ops,
- .n_ops = ARRAY_SIZE(ct_limit_genl_ops),
- .mcgrps = &ovs_ct_limit_multicast_group,
- .n_mcgrps = 1,
- .module = THIS_MODULE,
- };
- #endif
- int ovs_ct_init(struct net *net)
- {
- unsigned int n_bits = sizeof(struct ovs_key_ct_labels) * BITS_PER_BYTE;
- struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
- if (nf_connlabels_get(net, n_bits - 1)) {
- ovs_net->xt_label = false;
- OVS_NLERR(true, "Failed to set connlabel length");
- } else {
- ovs_net->xt_label = true;
- }
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- return ovs_ct_limit_init(net, ovs_net);
- #else
- return 0;
- #endif
- }
- void ovs_ct_exit(struct net *net)
- {
- struct ovs_net *ovs_net = net_generic(net, ovs_net_id);
- #if IS_ENABLED(CONFIG_NETFILTER_CONNCOUNT)
- ovs_ct_limit_exit(net, ovs_net);
- #endif
- if (ovs_net->xt_label)
- nf_connlabels_put(net);
- }
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