| // 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_TCP, |
| 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_TCP, |
| 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 tcf_ct_flow_table *ct_ft; |
| |
| ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table, |
| rwork); |
| nf_flow_table_free(&ct_ft->nf_ft); |
| 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; |
| |
| /* Previously seen or loopback */ |
| ct = nf_ct_get(skb, &ctinfo); |
| if ((ct && !nf_ct_is_template(ct)) || ctinfo == IP_CT_UNTRACKED) |
| return false; |
| |
| 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_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 = ct_nat_execute(skb, ct, ctinfo, range, maniptype); |
| } |
| 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 (!commit && 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. |
| */ |
| nf_conntrack_confirm(skb); |
| } else 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] = { .type = NLA_EXACT_LEN, .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] = { .type = NLA_EXACT_LEN, |
| .len = sizeof(struct in6_addr) }, |
| [TCA_CT_NAT_IPV6_MAX] = { .type = NLA_EXACT_LEN, |
| .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)); |
| } |
| |
| if (p->zone == NF_CT_DEFAULT_ZONE_ID) |
| return 0; |
| |
| 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"); |