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![Dan Carpenter](/assets/img/avatar_default.png)
The tcf_ct_flow_table_fill_tuple_ipv6() function is supposed to return
false on failure. It should not return negatives because that means
succes/true.
Fixes: fcb6aa8653
("act_ct: Support GRE offload")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Acked-by: Toshiaki Makita <toshiaki.makita1@gmail.com>
Link: https://lore.kernel.org/r/YpYFnbDxFl6tQ3Bn@kili
Signed-off-by: Paolo Abeni <pabeni@redhat.com>
1701 lines
41 KiB
C
1701 lines
41 KiB
C
// SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
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/* -
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* net/sched/act_ct.c Connection Tracking action
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*
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* Authors: Paul Blakey <paulb@mellanox.com>
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* Yossi Kuperman <yossiku@mellanox.com>
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* Marcelo Ricardo Leitner <marcelo.leitner@gmail.com>
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*/
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/skbuff.h>
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#include <linux/rtnetlink.h>
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#include <linux/pkt_cls.h>
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#include <linux/ip.h>
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#include <linux/ipv6.h>
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#include <linux/rhashtable.h>
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#include <net/netlink.h>
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#include <net/pkt_sched.h>
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#include <net/pkt_cls.h>
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#include <net/act_api.h>
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#include <net/ip.h>
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#include <net/ipv6_frag.h>
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#include <uapi/linux/tc_act/tc_ct.h>
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#include <net/tc_act/tc_ct.h>
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#include <net/netfilter/nf_flow_table.h>
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#include <net/netfilter/nf_conntrack.h>
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#include <net/netfilter/nf_conntrack_core.h>
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#include <net/netfilter/nf_conntrack_zones.h>
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#include <net/netfilter/nf_conntrack_helper.h>
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#include <net/netfilter/nf_conntrack_acct.h>
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#include <net/netfilter/ipv6/nf_defrag_ipv6.h>
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#include <net/netfilter/nf_conntrack_act_ct.h>
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#include <uapi/linux/netfilter/nf_nat.h>
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static struct workqueue_struct *act_ct_wq;
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static struct rhashtable zones_ht;
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static DEFINE_MUTEX(zones_mutex);
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struct tcf_ct_flow_table {
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struct rhash_head node; /* In zones tables */
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struct rcu_work rwork;
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struct nf_flowtable nf_ft;
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refcount_t ref;
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u16 zone;
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bool dying;
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};
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static const struct rhashtable_params zones_params = {
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.head_offset = offsetof(struct tcf_ct_flow_table, node),
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.key_offset = offsetof(struct tcf_ct_flow_table, zone),
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.key_len = sizeof_field(struct tcf_ct_flow_table, zone),
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.automatic_shrinking = true,
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};
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static struct flow_action_entry *
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tcf_ct_flow_table_flow_action_get_next(struct flow_action *flow_action)
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{
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int i = flow_action->num_entries++;
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return &flow_action->entries[i];
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}
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static void tcf_ct_add_mangle_action(struct flow_action *action,
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enum flow_action_mangle_base htype,
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u32 offset,
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u32 mask,
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u32 val)
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{
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struct flow_action_entry *entry;
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entry = tcf_ct_flow_table_flow_action_get_next(action);
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entry->id = FLOW_ACTION_MANGLE;
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entry->mangle.htype = htype;
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entry->mangle.mask = ~mask;
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entry->mangle.offset = offset;
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entry->mangle.val = val;
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}
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/* The following nat helper functions check if the inverted reverse tuple
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* (target) is different then the current dir tuple - meaning nat for ports
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* and/or ip is needed, and add the relevant mangle actions.
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*/
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static void
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tcf_ct_flow_table_add_action_nat_ipv4(const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_tuple target,
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struct flow_action *action)
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{
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if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
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offsetof(struct iphdr, saddr),
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0xFFFFFFFF,
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be32_to_cpu(target.src.u3.ip));
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if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP4,
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offsetof(struct iphdr, daddr),
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0xFFFFFFFF,
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be32_to_cpu(target.dst.u3.ip));
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}
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static void
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tcf_ct_add_ipv6_addr_mangle_action(struct flow_action *action,
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union nf_inet_addr *addr,
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u32 offset)
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{
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int i;
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for (i = 0; i < sizeof(struct in6_addr) / sizeof(u32); i++)
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_IP6,
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i * sizeof(u32) + offset,
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0xFFFFFFFF, be32_to_cpu(addr->ip6[i]));
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}
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static void
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tcf_ct_flow_table_add_action_nat_ipv6(const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_tuple target,
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struct flow_action *action)
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{
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if (memcmp(&target.src.u3, &tuple->src.u3, sizeof(target.src.u3)))
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tcf_ct_add_ipv6_addr_mangle_action(action, &target.src.u3,
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offsetof(struct ipv6hdr,
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saddr));
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if (memcmp(&target.dst.u3, &tuple->dst.u3, sizeof(target.dst.u3)))
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tcf_ct_add_ipv6_addr_mangle_action(action, &target.dst.u3,
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offsetof(struct ipv6hdr,
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daddr));
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}
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static void
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tcf_ct_flow_table_add_action_nat_tcp(const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_tuple target,
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struct flow_action *action)
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{
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__be16 target_src = target.src.u.tcp.port;
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__be16 target_dst = target.dst.u.tcp.port;
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if (target_src != tuple->src.u.tcp.port)
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
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offsetof(struct tcphdr, source),
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0xFFFF, be16_to_cpu(target_src));
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if (target_dst != tuple->dst.u.tcp.port)
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_TCP,
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offsetof(struct tcphdr, dest),
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0xFFFF, be16_to_cpu(target_dst));
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}
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static void
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tcf_ct_flow_table_add_action_nat_udp(const struct nf_conntrack_tuple *tuple,
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struct nf_conntrack_tuple target,
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struct flow_action *action)
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{
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__be16 target_src = target.src.u.udp.port;
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__be16 target_dst = target.dst.u.udp.port;
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if (target_src != tuple->src.u.udp.port)
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
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offsetof(struct udphdr, source),
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0xFFFF, be16_to_cpu(target_src));
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if (target_dst != tuple->dst.u.udp.port)
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tcf_ct_add_mangle_action(action, FLOW_ACT_MANGLE_HDR_TYPE_UDP,
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offsetof(struct udphdr, dest),
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0xFFFF, be16_to_cpu(target_dst));
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}
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static void tcf_ct_flow_table_add_action_meta(struct nf_conn *ct,
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enum ip_conntrack_dir dir,
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struct flow_action *action)
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{
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struct nf_conn_labels *ct_labels;
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struct flow_action_entry *entry;
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enum ip_conntrack_info ctinfo;
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u32 *act_ct_labels;
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entry = tcf_ct_flow_table_flow_action_get_next(action);
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entry->id = FLOW_ACTION_CT_METADATA;
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#if IS_ENABLED(CONFIG_NF_CONNTRACK_MARK)
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entry->ct_metadata.mark = ct->mark;
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#endif
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ctinfo = dir == IP_CT_DIR_ORIGINAL ? IP_CT_ESTABLISHED :
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IP_CT_ESTABLISHED_REPLY;
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/* aligns with the CT reference on the SKB nf_ct_set */
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entry->ct_metadata.cookie = (unsigned long)ct | ctinfo;
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entry->ct_metadata.orig_dir = dir == IP_CT_DIR_ORIGINAL;
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act_ct_labels = entry->ct_metadata.labels;
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ct_labels = nf_ct_labels_find(ct);
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if (ct_labels)
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memcpy(act_ct_labels, ct_labels->bits, NF_CT_LABELS_MAX_SIZE);
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else
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memset(act_ct_labels, 0, NF_CT_LABELS_MAX_SIZE);
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}
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static int tcf_ct_flow_table_add_action_nat(struct net *net,
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struct nf_conn *ct,
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enum ip_conntrack_dir dir,
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struct flow_action *action)
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{
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const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
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struct nf_conntrack_tuple target;
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if (!(ct->status & IPS_NAT_MASK))
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return 0;
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nf_ct_invert_tuple(&target, &ct->tuplehash[!dir].tuple);
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switch (tuple->src.l3num) {
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case NFPROTO_IPV4:
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tcf_ct_flow_table_add_action_nat_ipv4(tuple, target,
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action);
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break;
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case NFPROTO_IPV6:
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tcf_ct_flow_table_add_action_nat_ipv6(tuple, target,
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action);
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break;
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default:
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return -EOPNOTSUPP;
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}
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switch (nf_ct_protonum(ct)) {
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case IPPROTO_TCP:
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tcf_ct_flow_table_add_action_nat_tcp(tuple, target, action);
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break;
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case IPPROTO_UDP:
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tcf_ct_flow_table_add_action_nat_udp(tuple, target, action);
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break;
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default:
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return -EOPNOTSUPP;
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}
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return 0;
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}
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static int tcf_ct_flow_table_fill_actions(struct net *net,
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const struct flow_offload *flow,
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enum flow_offload_tuple_dir tdir,
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struct nf_flow_rule *flow_rule)
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{
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struct flow_action *action = &flow_rule->rule->action;
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int num_entries = action->num_entries;
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struct nf_conn *ct = flow->ct;
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enum ip_conntrack_dir dir;
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int i, err;
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switch (tdir) {
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case FLOW_OFFLOAD_DIR_ORIGINAL:
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dir = IP_CT_DIR_ORIGINAL;
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break;
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case FLOW_OFFLOAD_DIR_REPLY:
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dir = IP_CT_DIR_REPLY;
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break;
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default:
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return -EOPNOTSUPP;
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}
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err = tcf_ct_flow_table_add_action_nat(net, ct, dir, action);
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if (err)
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goto err_nat;
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tcf_ct_flow_table_add_action_meta(ct, dir, action);
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return 0;
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err_nat:
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/* Clear filled actions */
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for (i = num_entries; i < action->num_entries; i++)
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memset(&action->entries[i], 0, sizeof(action->entries[i]));
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action->num_entries = num_entries;
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return err;
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}
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static struct nf_flowtable_type flowtable_ct = {
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.action = tcf_ct_flow_table_fill_actions,
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.owner = THIS_MODULE,
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};
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static int tcf_ct_flow_table_get(struct tcf_ct_params *params)
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{
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struct tcf_ct_flow_table *ct_ft;
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int err = -ENOMEM;
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mutex_lock(&zones_mutex);
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ct_ft = rhashtable_lookup_fast(&zones_ht, ¶ms->zone, zones_params);
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if (ct_ft && refcount_inc_not_zero(&ct_ft->ref))
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goto out_unlock;
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ct_ft = kzalloc(sizeof(*ct_ft), GFP_KERNEL);
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if (!ct_ft)
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goto err_alloc;
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refcount_set(&ct_ft->ref, 1);
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ct_ft->zone = params->zone;
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err = rhashtable_insert_fast(&zones_ht, &ct_ft->node, zones_params);
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if (err)
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goto err_insert;
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ct_ft->nf_ft.type = &flowtable_ct;
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ct_ft->nf_ft.flags |= NF_FLOWTABLE_HW_OFFLOAD |
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NF_FLOWTABLE_COUNTER;
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err = nf_flow_table_init(&ct_ft->nf_ft);
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if (err)
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goto err_init;
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__module_get(THIS_MODULE);
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out_unlock:
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params->ct_ft = ct_ft;
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params->nf_ft = &ct_ft->nf_ft;
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mutex_unlock(&zones_mutex);
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return 0;
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err_init:
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rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
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err_insert:
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kfree(ct_ft);
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err_alloc:
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mutex_unlock(&zones_mutex);
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return err;
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}
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static void tcf_ct_flow_table_cleanup_work(struct work_struct *work)
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{
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struct flow_block_cb *block_cb, *tmp_cb;
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struct tcf_ct_flow_table *ct_ft;
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struct flow_block *block;
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ct_ft = container_of(to_rcu_work(work), struct tcf_ct_flow_table,
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rwork);
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nf_flow_table_free(&ct_ft->nf_ft);
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/* Remove any remaining callbacks before cleanup */
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block = &ct_ft->nf_ft.flow_block;
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down_write(&ct_ft->nf_ft.flow_block_lock);
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list_for_each_entry_safe(block_cb, tmp_cb, &block->cb_list, list) {
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list_del(&block_cb->list);
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flow_block_cb_free(block_cb);
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}
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up_write(&ct_ft->nf_ft.flow_block_lock);
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kfree(ct_ft);
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module_put(THIS_MODULE);
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}
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static void tcf_ct_flow_table_put(struct tcf_ct_params *params)
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{
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struct tcf_ct_flow_table *ct_ft = params->ct_ft;
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if (refcount_dec_and_test(¶ms->ct_ft->ref)) {
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rhashtable_remove_fast(&zones_ht, &ct_ft->node, zones_params);
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INIT_RCU_WORK(&ct_ft->rwork, tcf_ct_flow_table_cleanup_work);
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queue_rcu_work(act_ct_wq, &ct_ft->rwork);
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}
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}
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static void tcf_ct_flow_tc_ifidx(struct flow_offload *entry,
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struct nf_conn_act_ct_ext *act_ct_ext, u8 dir)
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{
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entry->tuplehash[dir].tuple.xmit_type = FLOW_OFFLOAD_XMIT_TC;
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entry->tuplehash[dir].tuple.tc.iifidx = act_ct_ext->ifindex[dir];
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}
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static void tcf_ct_flow_table_add(struct tcf_ct_flow_table *ct_ft,
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struct nf_conn *ct,
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bool tcp)
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{
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struct nf_conn_act_ct_ext *act_ct_ext;
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struct flow_offload *entry;
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int err;
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if (test_and_set_bit(IPS_OFFLOAD_BIT, &ct->status))
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return;
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entry = flow_offload_alloc(ct);
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if (!entry) {
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WARN_ON_ONCE(1);
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goto err_alloc;
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}
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if (tcp) {
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ct->proto.tcp.seen[0].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
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ct->proto.tcp.seen[1].flags |= IP_CT_TCP_FLAG_BE_LIBERAL;
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}
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act_ct_ext = nf_conn_act_ct_ext_find(ct);
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if (act_ct_ext) {
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tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_ORIGINAL);
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tcf_ct_flow_tc_ifidx(entry, act_ct_ext, FLOW_OFFLOAD_DIR_REPLY);
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}
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err = flow_offload_add(&ct_ft->nf_ft, entry);
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if (err)
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goto err_add;
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return;
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err_add:
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flow_offload_free(entry);
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err_alloc:
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clear_bit(IPS_OFFLOAD_BIT, &ct->status);
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}
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|
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static void tcf_ct_flow_table_process_conn(struct tcf_ct_flow_table *ct_ft,
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struct nf_conn *ct,
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enum ip_conntrack_info ctinfo)
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{
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bool tcp = false;
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if ((ctinfo != IP_CT_ESTABLISHED && ctinfo != IP_CT_ESTABLISHED_REPLY) ||
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!test_bit(IPS_ASSURED_BIT, &ct->status))
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return;
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|
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switch (nf_ct_protonum(ct)) {
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case IPPROTO_TCP:
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tcp = true;
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if (ct->proto.tcp.state != TCP_CONNTRACK_ESTABLISHED)
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return;
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break;
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case IPPROTO_UDP:
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break;
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#ifdef CONFIG_NF_CT_PROTO_GRE
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case IPPROTO_GRE: {
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struct nf_conntrack_tuple *tuple;
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if (ct->status & IPS_NAT_MASK)
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return;
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tuple = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
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/* No support for GRE v1 */
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if (tuple->src.u.gre.key || tuple->dst.u.gre.key)
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return;
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break;
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}
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#endif
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default:
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return;
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}
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|
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if (nf_ct_ext_exist(ct, NF_CT_EXT_HELPER) ||
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ct->status & IPS_SEQ_ADJUST)
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return;
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|
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tcf_ct_flow_table_add(ct_ft, ct, tcp);
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}
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|
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static bool
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tcf_ct_flow_table_fill_tuple_ipv4(struct sk_buff *skb,
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struct flow_offload_tuple *tuple,
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struct tcphdr **tcph)
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{
|
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struct flow_ports *ports;
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unsigned int thoff;
|
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struct iphdr *iph;
|
|
size_t hdrsize;
|
|
u8 ipproto;
|
|
|
|
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;
|
|
|
|
ipproto = iph->protocol;
|
|
switch (ipproto) {
|
|
case IPPROTO_TCP:
|
|
hdrsize = sizeof(struct tcphdr);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
hdrsize = sizeof(*ports);
|
|
break;
|
|
#ifdef CONFIG_NF_CT_PROTO_GRE
|
|
case IPPROTO_GRE:
|
|
hdrsize = sizeof(struct gre_base_hdr);
|
|
break;
|
|
#endif
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (iph->ttl <= 1)
|
|
return false;
|
|
|
|
if (!pskb_network_may_pull(skb, thoff + hdrsize))
|
|
return false;
|
|
|
|
switch (ipproto) {
|
|
case IPPROTO_TCP:
|
|
*tcph = (void *)(skb_network_header(skb) + thoff);
|
|
fallthrough;
|
|
case IPPROTO_UDP:
|
|
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
|
|
tuple->src_port = ports->source;
|
|
tuple->dst_port = ports->dest;
|
|
break;
|
|
case IPPROTO_GRE: {
|
|
struct gre_base_hdr *greh;
|
|
|
|
greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
|
|
if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
|
|
return false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
iph = ip_hdr(skb);
|
|
|
|
tuple->src_v4.s_addr = iph->saddr;
|
|
tuple->dst_v4.s_addr = iph->daddr;
|
|
tuple->l3proto = AF_INET;
|
|
tuple->l4proto = ipproto;
|
|
|
|
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;
|
|
size_t hdrsize;
|
|
u8 nexthdr;
|
|
|
|
if (!pskb_network_may_pull(skb, sizeof(*ip6h)))
|
|
return false;
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
thoff = sizeof(*ip6h);
|
|
|
|
nexthdr = ip6h->nexthdr;
|
|
switch (nexthdr) {
|
|
case IPPROTO_TCP:
|
|
hdrsize = sizeof(struct tcphdr);
|
|
break;
|
|
case IPPROTO_UDP:
|
|
hdrsize = sizeof(*ports);
|
|
break;
|
|
#ifdef CONFIG_NF_CT_PROTO_GRE
|
|
case IPPROTO_GRE:
|
|
hdrsize = sizeof(struct gre_base_hdr);
|
|
break;
|
|
#endif
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (ip6h->hop_limit <= 1)
|
|
return false;
|
|
|
|
if (!pskb_network_may_pull(skb, thoff + hdrsize))
|
|
return false;
|
|
|
|
switch (nexthdr) {
|
|
case IPPROTO_TCP:
|
|
*tcph = (void *)(skb_network_header(skb) + thoff);
|
|
fallthrough;
|
|
case IPPROTO_UDP:
|
|
ports = (struct flow_ports *)(skb_network_header(skb) + thoff);
|
|
tuple->src_port = ports->source;
|
|
tuple->dst_port = ports->dest;
|
|
break;
|
|
case IPPROTO_GRE: {
|
|
struct gre_base_hdr *greh;
|
|
|
|
greh = (struct gre_base_hdr *)(skb_network_header(skb) + thoff);
|
|
if ((greh->flags & GRE_VERSION) != GRE_VERSION_0)
|
|
return false;
|
|
break;
|
|
}
|
|
}
|
|
|
|
ip6h = ipv6_hdr(skb);
|
|
|
|
tuple->src_v6 = ip6h->saddr;
|
|
tuple->dst_v6 = ip6h->daddr;
|
|
tuple->l3proto = AF_INET6;
|
|
tuple->l4proto = 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);
|
|
if (nf_ft->flags & NF_FLOWTABLE_COUNTER)
|
|
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)))
|
|
goto drop_ct;
|
|
if (nf_ct_zone(ct)->id != zone_id)
|
|
goto drop_ct;
|
|
|
|
/* Force conntrack entry direction. */
|
|
if (force && CTINFO2DIR(ctinfo) != IP_CT_DIR_ORIGINAL) {
|
|
if (nf_ct_is_confirmed(ct))
|
|
nf_ct_kill(ct);
|
|
|
|
goto drop_ct;
|
|
}
|
|
|
|
return true;
|
|
|
|
drop_ct:
|
|
nf_ct_put(ct);
|
|
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
|
|
|
|
return false;
|
|
}
|
|
|
|
/* 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 nf_conn *ct;
|
|
int err = 0;
|
|
bool frag;
|
|
u16 mru;
|
|
|
|
/* 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);
|
|
mru = tc_skb_cb(skb)->mru;
|
|
|
|
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;
|
|
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;
|
|
mru = IP6CB(skb)->frag_max_size;
|
|
}
|
|
#else
|
|
err = -EOPNOTSUPP;
|
|
goto out_free;
|
|
#endif
|
|
}
|
|
|
|
if (err != -EINPROGRESS)
|
|
tc_skb_cb(skb)->mru = mru;
|
|
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_ct_put(params->tmpl);
|
|
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);
|
|
if (err == NF_ACCEPT) {
|
|
if (maniptype == NF_NAT_MANIP_SRC)
|
|
tc_skb_cb(skb)->post_ct_snat = 1;
|
|
if (maniptype == NF_NAT_MANIP_DST)
|
|
tc_skb_cb(skb)->post_ct_dnat = 1;
|
|
}
|
|
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);
|
|
tcf_action_update_bstats(&c->common, skb);
|
|
|
|
if (clear) {
|
|
tc_skb_cb(skb)->post_ct = false;
|
|
ct = nf_ct_get(skb, &ctinfo);
|
|
if (ct) {
|
|
nf_ct_put(ct);
|
|
nf_ct_set(skb, NULL, IP_CT_UNTRACKED);
|
|
}
|
|
|
|
goto out_clear;
|
|
}
|
|
|
|
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_clear;
|
|
}
|
|
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) {
|
|
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);
|
|
nf_conn_act_ct_ext_fill(skb, ct, ctinfo);
|
|
|
|
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);
|
|
|
|
if (!nf_ct_is_confirmed(ct))
|
|
nf_conn_act_ct_ext_add(ct);
|
|
|
|
/* 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);
|
|
|
|
tc_skb_cb(skb)->post_ct = true;
|
|
tc_skb_cb(skb)->zone = p->zone;
|
|
out_clear:
|
|
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);
|
|
p->tmpl = tmpl;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int tcf_ct_init(struct net *net, struct nlattr *nla,
|
|
struct nlattr *est, struct tc_action **a,
|
|
struct tcf_proto *tp, u32 flags,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
struct tc_action_net *tn = net_generic(net, ct_net_id);
|
|
bool bind = flags & TCA_ACT_FLAGS_BIND;
|
|
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 (!(flags & TCA_ACT_FLAGS_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 int tcf_ct_offload_act_setup(struct tc_action *act, void *entry_data,
|
|
u32 *index_inc, bool bind,
|
|
struct netlink_ext_ack *extack)
|
|
{
|
|
if (bind) {
|
|
struct flow_action_entry *entry = entry_data;
|
|
|
|
entry->id = FLOW_ACTION_CT;
|
|
entry->ct.action = tcf_ct_action(act);
|
|
entry->ct.zone = tcf_ct_zone(act);
|
|
entry->ct.flow_table = tcf_ct_ft(act);
|
|
*index_inc = 1;
|
|
} else {
|
|
struct flow_offload_action *fl_action = entry_data;
|
|
|
|
fl_action->id = FLOW_ACTION_CT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
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,
|
|
.offload_act_setup = tcf_ct_offload_act_setup,
|
|
.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;
|
|
|
|
static_branch_inc(&tcf_frag_xmit_count);
|
|
|
|
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)
|
|
{
|
|
static_branch_dec(&tcf_frag_xmit_count);
|
|
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");
|