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- // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
- /* -
- * net/sched/act_ct.c Connection Tracking action
- *
- * Authors: Paul Blakey <paulb@mellanox.com>
- * Yossi Kuperman <yossiku@mellanox.com>
- * Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
- */
- #include <linux/module.h>
- #include <linux/init.h>
- #include <linux/kernel.h>
- #include <linux/skbuff.h>
- #include <linux/rtnetlink.h>
- #include <linux/pkt_cls.h>
- #include <linux/ip.h>
- #include <linux/ipv6.h>
- #include <linux/rhashtable.h>
- #include <net/netlink.h>
- #include <net/pkt_sched.h>
- #include <net/pkt_cls.h>
- #include <net/act_api.h>
- #include <net/ip.h>
- #include <net/ipv6_frag.h>
- #include <uapi/linux/tc_act/tc_ct.h>
- #include <net/tc_act/tc_ct.h>
- #include <net/netfilter/nf_flow_table.h>
- #include <net/netfilter/nf_conntrack.h>
- #include <net/netfilter/nf_conntrack_core.h>
- #include <net/netfilter/nf_conntrack_zones.h>
- #include <net/netfilter/nf_conntrack_helper.h>
- #include <net/netfilter/nf_conntrack_acct.h>
- #include <net/netfilter/ipv6/nf_defrag_ipv6.h>
- #include <uapi/linux/netfilter/nf_nat.h>
- static struct workqueue_struct *act_ct_wq;
- static struct rhashtable zones_ht;
- static DEFINE_MUTEX(zones_mutex);
- struct tcf_ct_flow_table {
- struct rhash_head node; /* In zones tables */
- struct rcu_work rwork;
- struct nf_flowtable nf_ft;
- refcount_t ref;
- u16 zone;
- bool dying;
- };
- static const struct rhashtable_params zones_params = {
- .head_offset = offsetof(struct tcf_ct_flow_table, node),
- .key_offset = offsetof(struct tcf_ct_flow_table, zone),
- .key_len = sizeof_field(struct tcf_ct_flow_table, zone),
- .automatic_shrinking = true,
- };
- static struct flow_action_entry *
- tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
- {
- int i = flow_action->num_entries++;
- return &flow_action->entries[i];
- }
- static void tcf_ct_add_mangle_action(struct flow_action *action,
- enum flow_action_mangle_base htype,
- u32 offset,
- u32 mask,
- u32 val)
- {
- struct flow_action_entry *entry;
- entry = tcf_ct_flow_table_flow_action_get_next(action);
- entry->id = FLOW_ACTION_MANGLE;
- entry->mangle.htype = htype;
- entry->mangle.mask = ~mask;
- entry->mangle.offset = offset;
- entry->mangle.val = val;
- }
- /* The following nat helper functions check if the inverted reverse tuple
- * (target) is different then the current dir tuple - meaning nat for ports
- * and/or ip is needed, and add the relevant mangle actions.
- */
- static void
- tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple target,
- struct flow_action *action)
- {
- if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
- offsetof(struct iphdr, saddr),
- 0xFFFFFFFF,
- be32_to_cpu(target.src.u3.ip));
- if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
- offsetof(struct iphdr, daddr),
- 0xFFFFFFFF,
- be32_to_cpu(target.dst.u3.ip));
- }
- static void
- tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
- union nf_inet_addr *addr,
- u32 offset)
- {
- int i;
- for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
- i * sizeof(u32) + offset,
- 0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
- }
- static void
- tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple target,
- struct flow_action *action)
- {
- if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
- tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
- offsetof(struct ipv6hdr,
- saddr));
- if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
- tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
- offsetof(struct ipv6hdr,
- daddr));
- }
- static void
- tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple target,
- struct flow_action *action)
- {
- __be16 target_src = target.src.u.tcp.port;
- __be16 target_dst = target.dst.u.tcp.port;
- if (target_src != tuple->src.u.tcp.port)
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
- offsetof(struct tcphdr, source),
- 0xFFFF, be16_to_cpu(target_src));
- if (target_dst != tuple->dst.u.tcp.port)
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
- offsetof(struct tcphdr, dest),
- 0xFFFF, be16_to_cpu(target_dst));
- }
- static void
- tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple target,
- struct flow_action *action)
- {
- __be16 target_src = target.src.u.udp.port;
- __be16 target_dst = target.dst.u.udp.port;
- if (target_src != tuple->src.u.udp.port)
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
- offsetof(struct udphdr, source),
- 0xFFFF, be16_to_cpu(target_src));
- if (target_dst != tuple->dst.u.udp.port)
- tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
- offsetof(struct udphdr, dest),
- 0xFFFF, be16_to_cpu(target_dst));
- }
- static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
- enum ip_conntrack_dir dir,
- struct flow_action *action)
- {
- struct nf_conn_labels *ct_labels;
- struct flow_action_entry *entry;
- enum ip_conntrack_info ctinfo;
- u32 *act_ct_labels;
- entry = tcf_ct_flow_table_flow_action_get_next(action);
- entry->id = FLOW_ACTION_CT_METADATA;
- #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
- entry->ct_metadata.mark = ct->mark;
- #endif
- ctinfo = dir == IP_CT_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
- IP_CT_ESTABLISHED_REPLY;
- /* aligns with the CT reference on the SKB nf_ct_set */
- entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
- act_ct_labels = entry->ct_metadata.labels;
- ct_labels = nf_ct_labels_find(ct);
- if (ct_labels)
- memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
- else
- memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
- }
- static int tcf_ct_flow_table_add_action_nat(struct net *net,
- struct nf_conn *ct,
- enum ip_conntrack_dir dir,
- struct flow_action *action)
- {
- const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
- struct nf_conntrack_tuple target;
- if (!(ct->status & IPS_NAT_MASK))
- return 0;
- nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
- switch (tuple->src.l3num) {
- case NFPROTO_IPV4:
- tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
- action);
- break;
- case NFPROTO_IPV6:
- tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
- action);
- break;
- default:
- return -EOPNOTSUPP;
- }
- switch (nf_ct_protonum(ct)) {
- case IPPROTO_TCP:
- tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
- break;
- case IPPROTO_UDP:
- tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
- break;
- default:
- return -EOPNOTSUPP;
- }
- return 0;
- }
- static int tcf_ct_flow_table_fill_actions(struct net *net,
- const struct flow_offload *flow,
- enum flow_offload_tuple_dir tdir,
- struct nf_flow_rule *flow_rule)
- {
- struct flow_action *action = &flow_rule->rule->action;
- int num_entries = action->num_entries;
- struct nf_conn *ct = flow->ct;
- enum ip_conntrack_dir dir;
- int i, err;
- switch (tdir) {
- case FLOW_OFFLOAD_DIR_ORIGINAL:
- dir = IP_CT_DIR_ORIGINAL;
- break;
- case FLOW_OFFLOAD_DIR_REPLY:
- dir = IP_CT_DIR_REPLY;
- break;
- default:
- return -EOPNOTSUPP;
- }
- err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
- if (err)
- goto err_nat;
- tcf_ct_flow_table_add_action_meta(ct, dir, action);
- return 0;
- err_nat:
- /* Clear filled actions */
- for (i = num_entries; i < action->num_entries; i++)
- memset(&action->entries[i], 0, sizeof(action->entries[i]));
- action->num_entries = num_entries;
- return err;
- }
- static struct nf_flowtable_type flowtable_ct = {
- .action = tcf_ct_flow_table_fill_actions,
- .owner = THIS_MODULE,
- };
- static int tcf_ct_flow_table_get(struct tcf_ct_params *params)
- {
- struct tcf_ct_flow_table *ct_ft;
- int err = -ENOMEM;
- mutex_lock(&zones_mutex);
- ct_ft = rhashtable_lookup_fast(&zones_ht, ¶ms->zone, zones_params);
- if (ct_ft && refcount_inc_not_zero(&ct_ft->ref))
- goto out_unlock;
- ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
- if (!ct_ft)
- goto err_alloc;
- refcount_set(&ct_ft->ref, 1);
- ct_ft->zone = params->zone;
- err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
- if (err)
- goto err_insert;
- ct_ft->nf_ft.type = &flowtable_ct;
- ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD;
- err = nf_flow_table_init(&ct_ft->nf_ft);
- if (err)
- goto err_init;
- __module_get(THIS_MODULE);
- out_unlock:
- params->ct_ft = ct_ft;
- params->nf_ft = &ct_ft->nf_ft;
- mutex_unlock(&zones_mutex);
- return 0;
- err_init:
- rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
- err_insert:
- kfree(ct_ft);
- err_alloc:
- mutex_unlock(&zones_mutex);
- return err;
- }
- static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
- {
- struct flow_block_cb *block_cb, *tmp_cb;
- struct tcf_ct_flow_table *ct_ft;
- struct flow_block *block;
- ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
- rwork);
- nf_flow_table_free(&ct_ft->nf_ft);
- /* Remove any remaining callbacks before cleanup */
- block = &ct_ft->nf_ft.flow_block;
- down_write(&ct_ft->nf_ft.flow_block_lock);
- list_for_each_entry_safe(block_cb, tmp_cb, &block->cb_list, list) {
- list_del(&block_cb->list);
- flow_block_cb_free(block_cb);
- }
- up_write(&ct_ft->nf_ft.flow_block_lock);
- kfree(ct_ft);
- module_put(THIS_MODULE);
- }
- static void tcf_ct_flow_table_put(struct tcf_ct_params *params)
- {
- struct tcf_ct_flow_table *ct_ft = params->ct_ft;
- if (refcount_dec_and_test(¶ms->ct_ft->ref)) {
- rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
- INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
- queue_rcu_work(act_ct_wq, &ct_ft->rwork);
- }
- }
- static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
- struct nf_conn *ct,
- bool tcp)
- {
- struct flow_offload *entry;
- int err;
- if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
- return;
- entry = flow_offload_alloc(ct);
- if (!entry) {
- WARN_ON_ONCE(1);
- goto err_alloc;
- }
- if (tcp) {
- ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
- ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
- }
- err = flow_offload_add(&ct_ft->nf_ft, entry);
- if (err)
- goto err_add;
- return;
- err_add:
- flow_offload_free(entry);
- err_alloc:
- clear_bit(IPS_OFFLOAD_BIT, &ct->status);
- }
- static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
- struct nf_conn *ct,
- enum ip_conntrack_info ctinfo)
- {
- bool tcp = false;
- if (ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY)
- return;
- switch (nf_ct_protonum(ct)) {
- case IPPROTO_TCP:
- tcp = true;
- if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
- return;
- break;
- case IPPROTO_UDP:
- break;
- default:
- return;
- }
- if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
- ct->status & IPS_SEQ_ADJUST)
- return;
- tcf_ct_flow_table_add(ct_ft, ct, tcp);
- }
- static bool
- tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
- struct flow_offload_tuple *tuple,
- struct tcphdr **tcph)
- {
- struct flow_ports *ports;
- unsigned int thoff;
- struct iphdr *iph;
- if (!pskb_network_may_pull(skb, sizeof(*iph)))
- return false;
- iph = ip_hdr(skb);
- thoff = iph->ihl * 4;
- if (ip_is_fragment(iph) ||
- unlikely(thoff != sizeof(struct iphdr)))
- return false;
- if (iph->protocol != IPPROTO_TCP &&
- iph->protocol != IPPROTO_UDP)
- return false;
- if (iph->ttl <= 1)
- return false;
- if (!pskb_network_may_pull(skb, iph->protocol == IPPROTO_TCP ?
- thoff + sizeof(struct tcphdr) :
- thoff + sizeof(*ports)))
- return false;
- iph = ip_hdr(skb);
- if (iph->protocol == IPPROTO_TCP)
- *tcph = (void *)(skb_network_header(skb) + thoff);
- ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
- tuple->src_v4.s_addr = iph->saddr;
- tuple->dst_v4.s_addr = iph->daddr;
- tuple->src_port = ports->source;
- tuple->dst_port = ports->dest;
- tuple->l3proto = AF_INET;
- tuple->l4proto = iph->protocol;
- return true;
- }
- static bool
- tcf_ct_flow_table_fill_tuple_ipv6(struct sk_buff *skb,
- struct flow_offload_tuple *tuple,
- struct tcphdr **tcph)
- {
- struct flow_ports *ports;
- struct ipv6hdr *ip6h;
- unsigned int thoff;
- if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
- return false;
- ip6h = ipv6_hdr(skb);
- if (ip6h->nexthdr != IPPROTO_TCP &&
- ip6h->nexthdr != IPPROTO_UDP)
- return false;
- if (ip6h->hop_limit <= 1)
- return false;
- thoff = sizeof(*ip6h);
- if (!pskb_network_may_pull(skb, ip6h->nexthdr == IPPROTO_TCP ?
- thoff + sizeof(struct tcphdr) :
- thoff + sizeof(*ports)))
- return false;
- ip6h = ipv6_hdr(skb);
- if (ip6h->nexthdr == IPPROTO_TCP)
- *tcph = (void *)(skb_network_header(skb) + thoff);
- ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
- tuple->src_v6 = ip6h->saddr;
- tuple->dst_v6 = ip6h->daddr;
- tuple->src_port = ports->source;
- tuple->dst_port = ports->dest;
- tuple->l3proto = AF_INET6;
- tuple->l4proto = ip6h->nexthdr;
- return true;
- }
- static bool tcf_ct_flow_table_lookup(struct tcf_ct_params *p,
- struct sk_buff *skb,
- u8 family)
- {
- struct nf_flowtable *nf_ft = &p->ct_ft->nf_ft;
- struct flow_offload_tuple_rhash *tuplehash;
- struct flow_offload_tuple tuple = {};
- enum ip_conntrack_info ctinfo;
- struct tcphdr *tcph = NULL;
- struct flow_offload *flow;
- struct nf_conn *ct;
- u8 dir;
- switch (family) {
- case NFPROTO_IPV4:
- if (!tcf_ct_flow_table_fill_tuple_ipv4(skb, &tuple, &tcph))
- return false;
- break;
- case NFPROTO_IPV6:
- if (!tcf_ct_flow_table_fill_tuple_ipv6(skb, &tuple, &tcph))
- return false;
- break;
- default:
- return false;
- }
- tuplehash = flow_offload_lookup(nf_ft, &tuple);
- if (!tuplehash)
- return false;
- dir = tuplehash->tuple.dir;
- flow = container_of(tuplehash, struct flow_offload, tuplehash[dir]);
- ct = flow->ct;
- if (tcph && (unlikely(tcph->fin || tcph->rst))) {
- flow_offload_teardown(flow);
- return false;
- }
- ctinfo = dir == FLOW_OFFLOAD_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
- IP_CT_ESTABLISHED_REPLY;
- flow_offload_refresh(nf_ft, flow);
- nf_conntrack_get(&ct->ct_general);
- nf_ct_set(skb, ct, ctinfo);
- nf_ct_acct_update(ct, dir, skb->len);
- return true;
- }
- static int tcf_ct_flow_tables_init(void)
- {
- return rhashtable_init(&zones_ht, &zones_params);
- }
- static void tcf_ct_flow_tables_uninit(void)
- {
- rhashtable_destroy(&zones_ht);
- }
- static struct tc_action_ops act_ct_ops;
- static unsigned int ct_net_id;
- struct tc_ct_action_net {
- struct tc_action_net tn; /* Must be first */
- bool labels;
- };
- /* Determine whether skb->_nfct is equal to the result of conntrack lookup. */
- static bool tcf_ct_skb_nfct_cached(struct net *net, struct sk_buff *skb,
- u16 zone_id, bool force)
- {
- enum ip_conntrack_info ctinfo;
- struct nf_conn *ct;
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- return false;
- if (!net_eq(net, read_pnet(&ct->ct_net)))
- return false;
- if (nf_ct_zone(ct)->id != zone_id)
- return false;
- /* Force conntrack entry direction. */
- if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
- if (nf_ct_is_confirmed(ct))
- nf_ct_kill(ct);
- nf_conntrack_put(&ct->ct_general);
- nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
- return false;
- }
- return true;
- }
- /* 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 tcf_ct_skb_network_trim(struct sk_buff *skb, int family)
- {
- unsigned int len;
- int err;
- switch (family) {
- case NFPROTO_IPV4:
- len = ntohs(ip_hdr(skb)->tot_len);
- break;
- case NFPROTO_IPV6:
- len = sizeof(struct ipv6hdr)
- + ntohs(ipv6_hdr(skb)->payload_len);
- break;
- default:
- len = skb->len;
- }
- err = pskb_trim_rcsum(skb, len);
- return err;
- }
- static u8 tcf_ct_skb_nf_family(struct sk_buff *skb)
- {
- u8 family = NFPROTO_UNSPEC;
- switch (skb_protocol(skb, true)) {
- case htons(ETH_P_IP):
- family = NFPROTO_IPV4;
- break;
- case htons(ETH_P_IPV6):
- family = NFPROTO_IPV6;
- break;
- default:
- break;
- }
- return family;
- }
- static int tcf_ct_ipv4_is_fragment(struct sk_buff *skb, bool *frag)
- {
- unsigned int len;
- len = skb_network_offset(skb) + sizeof(struct iphdr);
- if (unlikely(skb->len < len))
- return -EINVAL;
- if (unlikely(!pskb_may_pull(skb, len)))
- return -ENOMEM;
- *frag = ip_is_fragment(ip_hdr(skb));
- return 0;
- }
- static int tcf_ct_ipv6_is_fragment(struct sk_buff *skb, bool *frag)
- {
- unsigned int flags = 0, len, payload_ofs = 0;
- unsigned short frag_off;
- int nexthdr;
- len = skb_network_offset(skb) + sizeof(struct ipv6hdr);
- if (unlikely(skb->len < len))
- return -EINVAL;
- if (unlikely(!pskb_may_pull(skb, len)))
- return -ENOMEM;
- nexthdr = ipv6_find_hdr(skb, &payload_ofs, -1, &frag_off, &flags);
- if (unlikely(nexthdr < 0))
- return -EPROTO;
- *frag = flags & IP6_FH_F_FRAG;
- return 0;
- }
- static int tcf_ct_handle_fragments(struct net *net, struct sk_buff *skb,
- u8 family, u16 zone, bool *defrag)
- {
- enum ip_conntrack_info ctinfo;
- struct qdisc_skb_cb cb;
- struct nf_conn *ct;
- int err = 0;
- bool frag;
- /* Previously seen (loopback)? Ignore. */
- ct = nf_ct_get(skb, &ctinfo);
- if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED)
- return 0;
- if (family == NFPROTO_IPV4)
- err = tcf_ct_ipv4_is_fragment(skb, &frag);
- else
- err = tcf_ct_ipv6_is_fragment(skb, &frag);
- if (err || !frag)
- return err;
- skb_get(skb);
- cb = *qdisc_skb_cb(skb);
- if (family == NFPROTO_IPV4) {
- enum ip_defrag_users user = IP_DEFRAG_CONNTRACK_IN + zone;
- memset(IPCB(skb), 0, sizeof(struct inet_skb_parm));
- local_bh_disable();
- err = ip_defrag(net, skb, user);
- local_bh_enable();
- if (err && err != -EINPROGRESS)
- return err;
- if (!err) {
- *defrag = true;
- cb.mru = IPCB(skb)->frag_max_size;
- }
- } else { /* NFPROTO_IPV6 */
- #if IS_ENABLED(CONFIG_NF_DEFRAG_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 && err != -EINPROGRESS)
- goto out_free;
- if (!err) {
- *defrag = true;
- cb.mru = IP6CB(skb)->frag_max_size;
- }
- #else
- err = -EOPNOTSUPP;
- goto out_free;
- #endif
- }
- *qdisc_skb_cb(skb) = cb;
- skb_clear_hash(skb);
- skb->ignore_df = 1;
- return err;
- out_free:
- kfree_skb(skb);
- return err;
- }
- static void tcf_ct_params_free(struct rcu_head *head)
- {
- struct tcf_ct_params *params = container_of(head,
- struct tcf_ct_params, rcu);
- tcf_ct_flow_table_put(params);
- if (params->tmpl)
- nf_conntrack_put(¶ms->tmpl->ct_general);
- kfree(params);
- }
- #if IS_ENABLED(CONFIG_NF_NAT)
- /* 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 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)
- {
- __be16 proto = skb_protocol(skb, true);
- int hooknum, err = NF_ACCEPT;
- /* 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 (proto == htons(ETH_P_IP) &&
- ip_hdr(skb)->protocol == IPPROTO_ICMP) {
- if (!nf_nat_icmp_reply_translation(skb, ct, ctinfo,
- hooknum))
- err = NF_DROP;
- goto out;
- } else if (IS_ENABLED(CONFIG_IPV6) && proto == 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 out;
- }
- }
- /* Non-ICMP, fall thru to initialize if needed. */
- fallthrough;
- 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 out;
- }
- break;
- case IP_CT_ESTABLISHED:
- case IP_CT_ESTABLISHED_REPLY:
- break;
- default:
- err = NF_DROP;
- goto out;
- }
- err = nf_nat_packet(ct, ctinfo, hooknum, skb);
- out:
- return err;
- }
- #endif /* CONFIG_NF_NAT */
- static void tcf_ct_act_set_mark(struct nf_conn *ct, u32 mark, u32 mask)
- {
- #if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
- u32 new_mark;
- if (!mask)
- return;
- new_mark = 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);
- }
- #endif
- }
- static void tcf_ct_act_set_labels(struct nf_conn *ct,
- u32 *labels,
- u32 *labels_m)
- {
- #if IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)
- size_t labels_sz = sizeof_field(struct tcf_ct_params, labels);
- if (!memchr_inv(labels_m, 0, labels_sz))
- return;
- nf_connlabels_replace(ct, labels, labels_m, 4);
- #endif
- }
- static int tcf_ct_act_nat(struct sk_buff *skb,
- struct nf_conn *ct,
- enum ip_conntrack_info ctinfo,
- int ct_action,
- struct nf_nat_range2 *range,
- bool commit)
- {
- #if IS_ENABLED(CONFIG_NF_NAT)
- int err;
- enum nf_nat_manip_type maniptype;
- if (!(ct_action & TCA_CT_ACT_NAT))
- return NF_ACCEPT;
- /* Add NAT extension if not confirmed yet. */
- if (!nf_ct_is_confirmed(ct) && !nf_ct_nat_ext_add(ct))
- return NF_DROP; /* Can't NAT. */
- if (ctinfo != IP_CT_NEW && (ct->status & IPS_NAT_MASK) &&
- (ctinfo != IP_CT_RELATED || 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 (ct_action & TCA_CT_ACT_NAT_SRC) {
- maniptype = NF_NAT_MANIP_SRC;
- } else if (ct_action & TCA_CT_ACT_NAT_DST) {
- maniptype = NF_NAT_MANIP_DST;
- } else {
- return NF_ACCEPT;
- }
- err = ct_nat_execute(skb, ct, ctinfo, range, maniptype);
- if (err == NF_ACCEPT && ct->status & IPS_DST_NAT) {
- if (ct->status & IPS_SRC_NAT) {
- if (maniptype == NF_NAT_MANIP_SRC)
- maniptype = NF_NAT_MANIP_DST;
- else
- maniptype = NF_NAT_MANIP_SRC;
- err = ct_nat_execute(skb, ct, ctinfo, range,
- maniptype);
- } else if (CTINFO2DIR(ctinfo) == IP_CT_DIR_ORIGINAL) {
- err = ct_nat_execute(skb, ct, ctinfo, NULL,
- NF_NAT_MANIP_SRC);
- }
- }
- return err;
- #else
- return NF_ACCEPT;
- #endif
- }
- static int tcf_ct_act(struct sk_buff *skb, const struct tc_action *a,
- struct tcf_result *res)
- {
- struct net *net = dev_net(skb->dev);
- bool cached, commit, clear, force;
- enum ip_conntrack_info ctinfo;
- struct tcf_ct *c = to_ct(a);
- struct nf_conn *tmpl = NULL;
- struct nf_hook_state state;
- int nh_ofs, err, retval;
- struct tcf_ct_params *p;
- bool skip_add = false;
- bool defrag = false;
- struct nf_conn *ct;
- u8 family;
- p = rcu_dereference_bh(c->params);
- retval = READ_ONCE(c->tcf_action);
- commit = p->ct_action & TCA_CT_ACT_COMMIT;
- clear = p->ct_action & TCA_CT_ACT_CLEAR;
- force = p->ct_action & TCA_CT_ACT_FORCE;
- tmpl = p->tmpl;
- tcf_lastuse_update(&c->tcf_tm);
- if (clear) {
- ct = nf_ct_get(skb, &ctinfo);
- if (ct) {
- nf_conntrack_put(&ct->ct_general);
- nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
- }
- goto out;
- }
- family = tcf_ct_skb_nf_family(skb);
- if (family == NFPROTO_UNSPEC)
- goto drop;
- /* The conntrack module expects to be working at L3.
- * We also try to pull the IPv4/6 header to linear area
- */
- nh_ofs = skb_network_offset(skb);
- skb_pull_rcsum(skb, nh_ofs);
- err = tcf_ct_handle_fragments(net, skb, family, p->zone, &defrag);
- if (err == -EINPROGRESS) {
- retval = TC_ACT_STOLEN;
- goto out;
- }
- if (err)
- goto drop;
- err = tcf_ct_skb_network_trim(skb, family);
- if (err)
- goto drop;
- /* If we are recirculating packets to match on ct fields and
- * committing with a separate ct action, then we don't need to
- * actually run the packet through conntrack twice unless it's for a
- * different zone.
- */
- cached = tcf_ct_skb_nfct_cached(net, skb, p->zone, force);
- if (!cached) {
- if (tcf_ct_flow_table_lookup(p, skb, family)) {
- skip_add = true;
- goto do_nat;
- }
- /* Associate skb with specified zone. */
- if (tmpl) {
- ct = nf_ct_get(skb, &ctinfo);
- if (skb_nfct(skb))
- nf_conntrack_put(skb_nfct(skb));
- nf_conntrack_get(&tmpl->ct_general);
- nf_ct_set(skb, tmpl, IP_CT_NEW);
- }
- state.hook = NF_INET_PRE_ROUTING;
- state.net = net;
- state.pf = family;
- err = nf_conntrack_in(skb, &state);
- if (err != NF_ACCEPT)
- goto out_push;
- }
- do_nat:
- ct = nf_ct_get(skb, &ctinfo);
- if (!ct)
- goto out_push;
- nf_ct_deliver_cached_events(ct);
- err = tcf_ct_act_nat(skb, ct, ctinfo, p->ct_action, &p->range, commit);
- if (err != NF_ACCEPT)
- goto drop;
- if (commit) {
- tcf_ct_act_set_mark(ct, p->mark, p->mark_mask);
- tcf_ct_act_set_labels(ct, p->labels, p->labels_mask);
- /* This will take care of sending queued events
- * even if the connection is already confirmed.
- */
- if (nf_conntrack_confirm(skb) != NF_ACCEPT)
- goto drop;
- }
- if (!skip_add)
- tcf_ct_flow_table_process_conn(p->ct_ft, ct, ctinfo);
- out_push:
- skb_push_rcsum(skb, nh_ofs);
- out:
- tcf_action_update_bstats(&c->common, skb);
- if (defrag)
- qdisc_skb_cb(skb)->pkt_len = skb->len;
- return retval;
- drop:
- tcf_action_inc_drop_qstats(&c->common);
- return TC_ACT_SHOT;
- }
- static const struct nla_policy ct_policy[TCA_CT_MAX + 1] = {
- [TCA_CT_ACTION] = { .type = NLA_U16 },
- [TCA_CT_PARMS] = NLA_POLICY_EXACT_LEN(sizeof(struct tc_ct)),
- [TCA_CT_ZONE] = { .type = NLA_U16 },
- [TCA_CT_MARK] = { .type = NLA_U32 },
- [TCA_CT_MARK_MASK] = { .type = NLA_U32 },
- [TCA_CT_LABELS] = { .type = NLA_BINARY,
- .len = 128 / BITS_PER_BYTE },
- [TCA_CT_LABELS_MASK] = { .type = NLA_BINARY,
- .len = 128 / BITS_PER_BYTE },
- [TCA_CT_NAT_IPV4_MIN] = { .type = NLA_U32 },
- [TCA_CT_NAT_IPV4_MAX] = { .type = NLA_U32 },
- [TCA_CT_NAT_IPV6_MIN] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
- [TCA_CT_NAT_IPV6_MAX] = NLA_POLICY_EXACT_LEN(sizeof(struct in6_addr)),
- [TCA_CT_NAT_PORT_MIN] = { .type = NLA_U16 },
- [TCA_CT_NAT_PORT_MAX] = { .type = NLA_U16 },
- };
- static int tcf_ct_fill_params_nat(struct tcf_ct_params *p,
- struct tc_ct *parm,
- struct nlattr **tb,
- struct netlink_ext_ack *extack)
- {
- struct nf_nat_range2 *range;
- if (!(p->ct_action & TCA_CT_ACT_NAT))
- return 0;
- if (!IS_ENABLED(CONFIG_NF_NAT)) {
- NL_SET_ERR_MSG_MOD(extack, "Netfilter nat isn't enabled in kernel");
- return -EOPNOTSUPP;
- }
- if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
- return 0;
- if ((p->ct_action & TCA_CT_ACT_NAT_SRC) &&
- (p->ct_action & TCA_CT_ACT_NAT_DST)) {
- NL_SET_ERR_MSG_MOD(extack, "dnat and snat can't be enabled at the same time");
- return -EOPNOTSUPP;
- }
- range = &p->range;
- if (tb[TCA_CT_NAT_IPV4_MIN]) {
- struct nlattr *max_attr = tb[TCA_CT_NAT_IPV4_MAX];
- p->ipv4_range = true;
- range->flags |= NF_NAT_RANGE_MAP_IPS;
- range->min_addr.ip =
- nla_get_in_addr(tb[TCA_CT_NAT_IPV4_MIN]);
- range->max_addr.ip = max_attr ?
- nla_get_in_addr(max_attr) :
- range->min_addr.ip;
- } else if (tb[TCA_CT_NAT_IPV6_MIN]) {
- struct nlattr *max_attr = tb[TCA_CT_NAT_IPV6_MAX];
- p->ipv4_range = false;
- range->flags |= NF_NAT_RANGE_MAP_IPS;
- range->min_addr.in6 =
- nla_get_in6_addr(tb[TCA_CT_NAT_IPV6_MIN]);
- range->max_addr.in6 = max_attr ?
- nla_get_in6_addr(max_attr) :
- range->min_addr.in6;
- }
- if (tb[TCA_CT_NAT_PORT_MIN]) {
- range->flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
- range->min_proto.all = nla_get_be16(tb[TCA_CT_NAT_PORT_MIN]);
- range->max_proto.all = tb[TCA_CT_NAT_PORT_MAX] ?
- nla_get_be16(tb[TCA_CT_NAT_PORT_MAX]) :
- range->min_proto.all;
- }
- return 0;
- }
- static void tcf_ct_set_key_val(struct nlattr **tb,
- void *val, int val_type,
- void *mask, int mask_type,
- int len)
- {
- if (!tb[val_type])
- return;
- nla_memcpy(val, tb[val_type], len);
- if (!mask)
- return;
- if (mask_type == TCA_CT_UNSPEC || !tb[mask_type])
- memset(mask, 0xff, len);
- else
- nla_memcpy(mask, tb[mask_type], len);
- }
- static int tcf_ct_fill_params(struct net *net,
- struct tcf_ct_params *p,
- struct tc_ct *parm,
- struct nlattr **tb,
- struct netlink_ext_ack *extack)
- {
- struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
- struct nf_conntrack_zone zone;
- struct nf_conn *tmpl;
- int err;
- p->zone = NF_CT_DEFAULT_ZONE_ID;
- tcf_ct_set_key_val(tb,
- &p->ct_action, TCA_CT_ACTION,
- NULL, TCA_CT_UNSPEC,
- sizeof(p->ct_action));
- if (p->ct_action & TCA_CT_ACT_CLEAR)
- return 0;
- err = tcf_ct_fill_params_nat(p, parm, tb, extack);
- if (err)
- return err;
- if (tb[TCA_CT_MARK]) {
- if (!IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)) {
- NL_SET_ERR_MSG_MOD(extack, "Conntrack mark isn't enabled.");
- return -EOPNOTSUPP;
- }
- tcf_ct_set_key_val(tb,
- &p->mark, TCA_CT_MARK,
- &p->mark_mask, TCA_CT_MARK_MASK,
- sizeof(p->mark));
- }
- if (tb[TCA_CT_LABELS]) {
- if (!IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS)) {
- NL_SET_ERR_MSG_MOD(extack, "Conntrack labels isn't enabled.");
- return -EOPNOTSUPP;
- }
- if (!tn->labels) {
- NL_SET_ERR_MSG_MOD(extack, "Failed to set connlabel length");
- return -EOPNOTSUPP;
- }
- tcf_ct_set_key_val(tb,
- p->labels, TCA_CT_LABELS,
- p->labels_mask, TCA_CT_LABELS_MASK,
- sizeof(p->labels));
- }
- if (tb[TCA_CT_ZONE]) {
- if (!IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES)) {
- NL_SET_ERR_MSG_MOD(extack, "Conntrack zones isn't enabled.");
- return -EOPNOTSUPP;
- }
- tcf_ct_set_key_val(tb,
- &p->zone, TCA_CT_ZONE,
- NULL, TCA_CT_UNSPEC,
- sizeof(p->zone));
- }
- nf_ct_zone_init(&zone, p->zone, NF_CT_DEFAULT_ZONE_DIR, 0);
- tmpl = nf_ct_tmpl_alloc(net, &zone, GFP_KERNEL);
- if (!tmpl) {
- NL_SET_ERR_MSG_MOD(extack, "Failed to allocate conntrack template");
- return -ENOMEM;
- }
- __set_bit(IPS_CONFIRMED_BIT, &tmpl->status);
- nf_conntrack_get(&tmpl->ct_general);
- p->tmpl = tmpl;
- return 0;
- }
- static int tcf_ct_init(struct net *net, struct nlattr *nla,
- struct nlattr *est, struct tc_action **a,
- int replace, int bind, bool rtnl_held,
- struct tcf_proto *tp, u32 flags,
- struct netlink_ext_ack *extack)
- {
- struct tc_action_net *tn = net_generic(net, ct_net_id);
- struct tcf_ct_params *params = NULL;
- struct nlattr *tb[TCA_CT_MAX + 1];
- struct tcf_chain *goto_ch = NULL;
- struct tc_ct *parm;
- struct tcf_ct *c;
- int err, res = 0;
- u32 index;
- if (!nla) {
- NL_SET_ERR_MSG_MOD(extack, "Ct requires attributes to be passed");
- return -EINVAL;
- }
- err = nla_parse_nested(tb, TCA_CT_MAX, nla, ct_policy, extack);
- if (err < 0)
- return err;
- if (!tb[TCA_CT_PARMS]) {
- NL_SET_ERR_MSG_MOD(extack, "Missing required ct parameters");
- return -EINVAL;
- }
- parm = nla_data(tb[TCA_CT_PARMS]);
- index = parm->index;
- err = tcf_idr_check_alloc(tn, &index, a, bind);
- if (err < 0)
- return err;
- if (!err) {
- err = tcf_idr_create_from_flags(tn, index, est, a,
- &act_ct_ops, bind, flags);
- if (err) {
- tcf_idr_cleanup(tn, index);
- return err;
- }
- res = ACT_P_CREATED;
- } else {
- if (bind)
- return 0;
- if (!replace) {
- tcf_idr_release(*a, bind);
- return -EEXIST;
- }
- }
- err = tcf_action_check_ctrlact(parm->action, tp, &goto_ch, extack);
- if (err < 0)
- goto cleanup;
- c = to_ct(*a);
- params = kzalloc(sizeof(*params), GFP_KERNEL);
- if (unlikely(!params)) {
- err = -ENOMEM;
- goto cleanup;
- }
- err = tcf_ct_fill_params(net, params, parm, tb, extack);
- if (err)
- goto cleanup;
- err = tcf_ct_flow_table_get(params);
- if (err)
- goto cleanup;
- spin_lock_bh(&c->tcf_lock);
- goto_ch = tcf_action_set_ctrlact(*a, parm->action, goto_ch);
- params = rcu_replace_pointer(c->params, params,
- lockdep_is_held(&c->tcf_lock));
- spin_unlock_bh(&c->tcf_lock);
- if (goto_ch)
- tcf_chain_put_by_act(goto_ch);
- if (params)
- call_rcu(¶ms->rcu, tcf_ct_params_free);
- return res;
- cleanup:
- if (goto_ch)
- tcf_chain_put_by_act(goto_ch);
- kfree(params);
- tcf_idr_release(*a, bind);
- return err;
- }
- static void tcf_ct_cleanup(struct tc_action *a)
- {
- struct tcf_ct_params *params;
- struct tcf_ct *c = to_ct(a);
- params = rcu_dereference_protected(c->params, 1);
- if (params)
- call_rcu(¶ms->rcu, tcf_ct_params_free);
- }
- static int tcf_ct_dump_key_val(struct sk_buff *skb,
- void *val, int val_type,
- void *mask, int mask_type,
- int len)
- {
- int err;
- if (mask && !memchr_inv(mask, 0, len))
- return 0;
- err = nla_put(skb, val_type, len, val);
- if (err)
- return err;
- if (mask_type != TCA_CT_UNSPEC) {
- err = nla_put(skb, mask_type, len, mask);
- if (err)
- return err;
- }
- return 0;
- }
- static int tcf_ct_dump_nat(struct sk_buff *skb, struct tcf_ct_params *p)
- {
- struct nf_nat_range2 *range = &p->range;
- if (!(p->ct_action & TCA_CT_ACT_NAT))
- return 0;
- if (!(p->ct_action & (TCA_CT_ACT_NAT_SRC | TCA_CT_ACT_NAT_DST)))
- return 0;
- if (range->flags & NF_NAT_RANGE_MAP_IPS) {
- if (p->ipv4_range) {
- if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MIN,
- range->min_addr.ip))
- return -1;
- if (nla_put_in_addr(skb, TCA_CT_NAT_IPV4_MAX,
- range->max_addr.ip))
- return -1;
- } else {
- if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MIN,
- &range->min_addr.in6))
- return -1;
- if (nla_put_in6_addr(skb, TCA_CT_NAT_IPV6_MAX,
- &range->max_addr.in6))
- return -1;
- }
- }
- if (range->flags & NF_NAT_RANGE_PROTO_SPECIFIED) {
- if (nla_put_be16(skb, TCA_CT_NAT_PORT_MIN,
- range->min_proto.all))
- return -1;
- if (nla_put_be16(skb, TCA_CT_NAT_PORT_MAX,
- range->max_proto.all))
- return -1;
- }
- return 0;
- }
- static inline int tcf_ct_dump(struct sk_buff *skb, struct tc_action *a,
- int bind, int ref)
- {
- unsigned char *b = skb_tail_pointer(skb);
- struct tcf_ct *c = to_ct(a);
- struct tcf_ct_params *p;
- struct tc_ct opt = {
- .index = c->tcf_index,
- .refcnt = refcount_read(&c->tcf_refcnt) - ref,
- .bindcnt = atomic_read(&c->tcf_bindcnt) - bind,
- };
- struct tcf_t t;
- spin_lock_bh(&c->tcf_lock);
- p = rcu_dereference_protected(c->params,
- lockdep_is_held(&c->tcf_lock));
- opt.action = c->tcf_action;
- if (tcf_ct_dump_key_val(skb,
- &p->ct_action, TCA_CT_ACTION,
- NULL, TCA_CT_UNSPEC,
- sizeof(p->ct_action)))
- goto nla_put_failure;
- if (p->ct_action & TCA_CT_ACT_CLEAR)
- goto skip_dump;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_MARK) &&
- tcf_ct_dump_key_val(skb,
- &p->mark, TCA_CT_MARK,
- &p->mark_mask, TCA_CT_MARK_MASK,
- sizeof(p->mark)))
- goto nla_put_failure;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_LABELS) &&
- tcf_ct_dump_key_val(skb,
- p->labels, TCA_CT_LABELS,
- p->labels_mask, TCA_CT_LABELS_MASK,
- sizeof(p->labels)))
- goto nla_put_failure;
- if (IS_ENABLED(CONFIG_NF_CONNTRACK_ZONES) &&
- tcf_ct_dump_key_val(skb,
- &p->zone, TCA_CT_ZONE,
- NULL, TCA_CT_UNSPEC,
- sizeof(p->zone)))
- goto nla_put_failure;
- if (tcf_ct_dump_nat(skb, p))
- goto nla_put_failure;
- skip_dump:
- if (nla_put(skb, TCA_CT_PARMS, sizeof(opt), &opt))
- goto nla_put_failure;
- tcf_tm_dump(&t, &c->tcf_tm);
- if (nla_put_64bit(skb, TCA_CT_TM, sizeof(t), &t, TCA_CT_PAD))
- goto nla_put_failure;
- spin_unlock_bh(&c->tcf_lock);
- return skb->len;
- nla_put_failure:
- spin_unlock_bh(&c->tcf_lock);
- nlmsg_trim(skb, b);
- return -1;
- }
- static int tcf_ct_walker(struct net *net, struct sk_buff *skb,
- struct netlink_callback *cb, int type,
- const struct tc_action_ops *ops,
- struct netlink_ext_ack *extack)
- {
- struct tc_action_net *tn = net_generic(net, ct_net_id);
- return tcf_generic_walker(tn, skb, cb, type, ops, extack);
- }
- static int tcf_ct_search(struct net *net, struct tc_action **a, u32 index)
- {
- struct tc_action_net *tn = net_generic(net, ct_net_id);
- return tcf_idr_search(tn, a, index);
- }
- static void tcf_stats_update(struct tc_action *a, u64 bytes, u64 packets,
- u64 drops, u64 lastuse, bool hw)
- {
- struct tcf_ct *c = to_ct(a);
- tcf_action_update_stats(a, bytes, packets, drops, hw);
- c->tcf_tm.lastuse = max_t(u64, c->tcf_tm.lastuse, lastuse);
- }
- static struct tc_action_ops act_ct_ops = {
- .kind = "ct",
- .id = TCA_ID_CT,
- .owner = THIS_MODULE,
- .act = tcf_ct_act,
- .dump = tcf_ct_dump,
- .init = tcf_ct_init,
- .cleanup = tcf_ct_cleanup,
- .walk = tcf_ct_walker,
- .lookup = tcf_ct_search,
- .stats_update = tcf_stats_update,
- .size = sizeof(struct tcf_ct),
- };
- static __net_init int ct_init_net(struct net *net)
- {
- unsigned int n_bits = sizeof_field(struct tcf_ct_params, labels) * 8;
- struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
- if (nf_connlabels_get(net, n_bits - 1)) {
- tn->labels = false;
- pr_err("act_ct: Failed to set connlabels length");
- } else {
- tn->labels = true;
- }
- return tc_action_net_init(net, &tn->tn, &act_ct_ops);
- }
- static void __net_exit ct_exit_net(struct list_head *net_list)
- {
- struct net *net;
- rtnl_lock();
- list_for_each_entry(net, net_list, exit_list) {
- struct tc_ct_action_net *tn = net_generic(net, ct_net_id);
- if (tn->labels)
- nf_connlabels_put(net);
- }
- rtnl_unlock();
- tc_action_net_exit(net_list, ct_net_id);
- }
- static struct pernet_operations ct_net_ops = {
- .init = ct_init_net,
- .exit_batch = ct_exit_net,
- .id = &ct_net_id,
- .size = sizeof(struct tc_ct_action_net),
- };
- static int __init ct_init_module(void)
- {
- int err;
- act_ct_wq = alloc_ordered_workqueue("act_ct_workqueue", 0);
- if (!act_ct_wq)
- return -ENOMEM;
- err = tcf_ct_flow_tables_init();
- if (err)
- goto err_tbl_init;
- err = tcf_register_action(&act_ct_ops, &ct_net_ops);
- if (err)
- goto err_register;
- return 0;
- err_register:
- tcf_ct_flow_tables_uninit();
- err_tbl_init:
- destroy_workqueue(act_ct_wq);
- return err;
- }
- static void __exit ct_cleanup_module(void)
- {
- tcf_unregister_action(&act_ct_ops, &ct_net_ops);
- tcf_ct_flow_tables_uninit();
- destroy_workqueue(act_ct_wq);
- }
- module_init(ct_init_module);
- module_exit(ct_cleanup_module);
- MODULE_AUTHOR("Paul Blakey <paulb@mellanox.com>");
- MODULE_AUTHOR("Yossi Kuperman <yossiku@mellanox.com>");
- MODULE_AUTHOR("Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>");
- MODULE_DESCRIPTION("Connection tracking action");
- MODULE_LICENSE("GPL v2");
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