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- /* Connection tracking via netlink socket. Allows for user space
- * protocol helpers and general trouble making from userspace.
- *
- * (C) 2001 by Jay Schulist <jschlst@samba.org>
- * (C) 2002-2006 by Harald Welte <laforge@gnumonks.org>
- * (C) 2003 by Patrick Mchardy <kaber@trash.net>
- * (C) 2005-2012 by Pablo Neira Ayuso <pablo@netfilter.org>
- *
- * Initial connection tracking via netlink development funded and
- * generally made possible by Network Robots, Inc. (www.networkrobots.com)
- *
- * Further development of this code funded by Astaro AG (http://www.astaro.com)
- *
- * This software may be used and distributed according to the terms
- * of the GNU General Public License, incorporated herein by reference.
- */
- #include <linux/init.h>
- #include <linux/module.h>
- #include <linux/kernel.h>
- #include <linux/rculist.h>
- #include <linux/rculist_nulls.h>
- #include <linux/types.h>
- #include <linux/timer.h>
- #include <linux/security.h>
- #include <linux/skbuff.h>
- #include <linux/errno.h>
- #include <linux/netlink.h>
- #include <linux/spinlock.h>
- #include <linux/interrupt.h>
- #include <linux/slab.h>
- #include <linux/siphash.h>
- #include <linux/netfilter.h>
- #include <net/netlink.h>
- #include <net/sock.h>
- #include <net/netfilter/nf_conntrack.h>
- #include <net/netfilter/nf_conntrack_core.h>
- #include <net/netfilter/nf_conntrack_expect.h>
- #include <net/netfilter/nf_conntrack_helper.h>
- #include <net/netfilter/nf_conntrack_seqadj.h>
- #include <net/netfilter/nf_conntrack_l4proto.h>
- #include <net/netfilter/nf_conntrack_tuple.h>
- #include <net/netfilter/nf_conntrack_acct.h>
- #include <net/netfilter/nf_conntrack_zones.h>
- #include <net/netfilter/nf_conntrack_timestamp.h>
- #include <net/netfilter/nf_conntrack_labels.h>
- #include <net/netfilter/nf_conntrack_synproxy.h>
- #if IS_ENABLED(CONFIG_NF_NAT)
- #include <net/netfilter/nf_nat.h>
- #include <net/netfilter/nf_nat_helper.h>
- #endif
- #include <linux/netfilter/nfnetlink.h>
- #include <linux/netfilter/nfnetlink_conntrack.h>
- #include "nf_internals.h"
- MODULE_LICENSE("GPL");
- static int ctnetlink_dump_tuples_proto(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_l4proto *l4proto)
- {
- int ret = 0;
- struct nlattr *nest_parms;
- nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO);
- if (!nest_parms)
- goto nla_put_failure;
- if (nla_put_u8(skb, CTA_PROTO_NUM, tuple->dst.protonum))
- goto nla_put_failure;
- if (likely(l4proto->tuple_to_nlattr))
- ret = l4proto->tuple_to_nlattr(skb, tuple);
- nla_nest_end(skb, nest_parms);
- return ret;
- nla_put_failure:
- return -1;
- }
- static int ipv4_tuple_to_nlattr(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple)
- {
- if (nla_put_in_addr(skb, CTA_IP_V4_SRC, tuple->src.u3.ip) ||
- nla_put_in_addr(skb, CTA_IP_V4_DST, tuple->dst.u3.ip))
- return -EMSGSIZE;
- return 0;
- }
- static int ipv6_tuple_to_nlattr(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple)
- {
- if (nla_put_in6_addr(skb, CTA_IP_V6_SRC, &tuple->src.u3.in6) ||
- nla_put_in6_addr(skb, CTA_IP_V6_DST, &tuple->dst.u3.in6))
- return -EMSGSIZE;
- return 0;
- }
- static int ctnetlink_dump_tuples_ip(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple)
- {
- int ret = 0;
- struct nlattr *nest_parms;
- nest_parms = nla_nest_start(skb, CTA_TUPLE_IP);
- if (!nest_parms)
- goto nla_put_failure;
- switch (tuple->src.l3num) {
- case NFPROTO_IPV4:
- ret = ipv4_tuple_to_nlattr(skb, tuple);
- break;
- case NFPROTO_IPV6:
- ret = ipv6_tuple_to_nlattr(skb, tuple);
- break;
- }
- nla_nest_end(skb, nest_parms);
- return ret;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_tuples(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple)
- {
- const struct nf_conntrack_l4proto *l4proto;
- int ret;
- rcu_read_lock();
- ret = ctnetlink_dump_tuples_ip(skb, tuple);
- if (ret >= 0) {
- l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
- ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto);
- }
- rcu_read_unlock();
- return ret;
- }
- static int ctnetlink_dump_zone_id(struct sk_buff *skb, int attrtype,
- const struct nf_conntrack_zone *zone, int dir)
- {
- if (zone->id == NF_CT_DEFAULT_ZONE_ID || zone->dir != dir)
- return 0;
- if (nla_put_be16(skb, attrtype, htons(zone->id)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct)
- {
- if (nla_put_be32(skb, CTA_STATUS, htonl(ct->status)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct)
- {
- long timeout = nf_ct_expires(ct) / HZ;
- if (nla_put_be32(skb, CTA_TIMEOUT, htonl(timeout)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_protoinfo(struct sk_buff *skb, struct nf_conn *ct)
- {
- const struct nf_conntrack_l4proto *l4proto;
- struct nlattr *nest_proto;
- int ret;
- l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
- if (!l4proto->to_nlattr)
- return 0;
- nest_proto = nla_nest_start(skb, CTA_PROTOINFO);
- if (!nest_proto)
- goto nla_put_failure;
- ret = l4proto->to_nlattr(skb, nest_proto, ct);
- nla_nest_end(skb, nest_proto);
- return ret;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_helpinfo(struct sk_buff *skb,
- const struct nf_conn *ct)
- {
- struct nlattr *nest_helper;
- const struct nf_conn_help *help = nfct_help(ct);
- struct nf_conntrack_helper *helper;
- if (!help)
- return 0;
- rcu_read_lock();
- helper = rcu_dereference(help->helper);
- if (!helper)
- goto out;
- nest_helper = nla_nest_start(skb, CTA_HELP);
- if (!nest_helper)
- goto nla_put_failure;
- if (nla_put_string(skb, CTA_HELP_NAME, helper->name))
- goto nla_put_failure;
- if (helper->to_nlattr)
- helper->to_nlattr(skb, ct);
- nla_nest_end(skb, nest_helper);
- out:
- rcu_read_unlock();
- return 0;
- nla_put_failure:
- rcu_read_unlock();
- return -1;
- }
- static int
- dump_counters(struct sk_buff *skb, struct nf_conn_acct *acct,
- enum ip_conntrack_dir dir, int type)
- {
- enum ctattr_type attr = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG;
- struct nf_conn_counter *counter = acct->counter;
- struct nlattr *nest_count;
- u64 pkts, bytes;
- if (type == IPCTNL_MSG_CT_GET_CTRZERO) {
- pkts = atomic64_xchg(&counter[dir].packets, 0);
- bytes = atomic64_xchg(&counter[dir].bytes, 0);
- } else {
- pkts = atomic64_read(&counter[dir].packets);
- bytes = atomic64_read(&counter[dir].bytes);
- }
- nest_count = nla_nest_start(skb, attr);
- if (!nest_count)
- goto nla_put_failure;
- if (nla_put_be64(skb, CTA_COUNTERS_PACKETS, cpu_to_be64(pkts),
- CTA_COUNTERS_PAD) ||
- nla_put_be64(skb, CTA_COUNTERS_BYTES, cpu_to_be64(bytes),
- CTA_COUNTERS_PAD))
- goto nla_put_failure;
- nla_nest_end(skb, nest_count);
- return 0;
- nla_put_failure:
- return -1;
- }
- static int
- ctnetlink_dump_acct(struct sk_buff *skb, const struct nf_conn *ct, int type)
- {
- struct nf_conn_acct *acct = nf_conn_acct_find(ct);
- if (!acct)
- return 0;
- if (dump_counters(skb, acct, IP_CT_DIR_ORIGINAL, type) < 0)
- return -1;
- if (dump_counters(skb, acct, IP_CT_DIR_REPLY, type) < 0)
- return -1;
- return 0;
- }
- static int
- ctnetlink_dump_timestamp(struct sk_buff *skb, const struct nf_conn *ct)
- {
- struct nlattr *nest_count;
- const struct nf_conn_tstamp *tstamp;
- tstamp = nf_conn_tstamp_find(ct);
- if (!tstamp)
- return 0;
- nest_count = nla_nest_start(skb, CTA_TIMESTAMP);
- if (!nest_count)
- goto nla_put_failure;
- if (nla_put_be64(skb, CTA_TIMESTAMP_START, cpu_to_be64(tstamp->start),
- CTA_TIMESTAMP_PAD) ||
- (tstamp->stop != 0 && nla_put_be64(skb, CTA_TIMESTAMP_STOP,
- cpu_to_be64(tstamp->stop),
- CTA_TIMESTAMP_PAD)))
- goto nla_put_failure;
- nla_nest_end(skb, nest_count);
- return 0;
- nla_put_failure:
- return -1;
- }
- #ifdef CONFIG_NF_CONNTRACK_MARK
- static int ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct)
- {
- if (nla_put_be32(skb, CTA_MARK, htonl(ct->mark)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- #else
- #define ctnetlink_dump_mark(a, b) (0)
- #endif
- #ifdef CONFIG_NF_CONNTRACK_SECMARK
- static int ctnetlink_dump_secctx(struct sk_buff *skb, const struct nf_conn *ct)
- {
- struct nlattr *nest_secctx;
- int len, ret;
- char *secctx;
- ret = security_secid_to_secctx(ct->secmark, &secctx, &len);
- if (ret)
- return 0;
- ret = -1;
- nest_secctx = nla_nest_start(skb, CTA_SECCTX);
- if (!nest_secctx)
- goto nla_put_failure;
- if (nla_put_string(skb, CTA_SECCTX_NAME, secctx))
- goto nla_put_failure;
- nla_nest_end(skb, nest_secctx);
- ret = 0;
- nla_put_failure:
- security_release_secctx(secctx, len);
- return ret;
- }
- #else
- #define ctnetlink_dump_secctx(a, b) (0)
- #endif
- #ifdef CONFIG_NF_CONNTRACK_LABELS
- static inline int ctnetlink_label_size(const struct nf_conn *ct)
- {
- struct nf_conn_labels *labels = nf_ct_labels_find(ct);
- if (!labels)
- return 0;
- return nla_total_size(sizeof(labels->bits));
- }
- static int
- ctnetlink_dump_labels(struct sk_buff *skb, const struct nf_conn *ct)
- {
- struct nf_conn_labels *labels = nf_ct_labels_find(ct);
- unsigned int i;
- if (!labels)
- return 0;
- i = 0;
- do {
- if (labels->bits[i] != 0)
- return nla_put(skb, CTA_LABELS, sizeof(labels->bits),
- labels->bits);
- i++;
- } while (i < ARRAY_SIZE(labels->bits));
- return 0;
- }
- #else
- #define ctnetlink_dump_labels(a, b) (0)
- #define ctnetlink_label_size(a) (0)
- #endif
- #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple)
- static int ctnetlink_dump_master(struct sk_buff *skb, const struct nf_conn *ct)
- {
- struct nlattr *nest_parms;
- if (!(ct->status & IPS_EXPECTED))
- return 0;
- nest_parms = nla_nest_start(skb, CTA_TUPLE_MASTER);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, master_tuple(ct)) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- return 0;
- nla_put_failure:
- return -1;
- }
- static int
- dump_ct_seq_adj(struct sk_buff *skb, const struct nf_ct_seqadj *seq, int type)
- {
- struct nlattr *nest_parms;
- nest_parms = nla_nest_start(skb, type);
- if (!nest_parms)
- goto nla_put_failure;
- if (nla_put_be32(skb, CTA_SEQADJ_CORRECTION_POS,
- htonl(seq->correction_pos)) ||
- nla_put_be32(skb, CTA_SEQADJ_OFFSET_BEFORE,
- htonl(seq->offset_before)) ||
- nla_put_be32(skb, CTA_SEQADJ_OFFSET_AFTER,
- htonl(seq->offset_after)))
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_ct_seq_adj(struct sk_buff *skb, struct nf_conn *ct)
- {
- struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
- struct nf_ct_seqadj *seq;
- if (!(ct->status & IPS_SEQ_ADJUST) || !seqadj)
- return 0;
- spin_lock_bh(&ct->lock);
- seq = &seqadj->seq[IP_CT_DIR_ORIGINAL];
- if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_ORIG) == -1)
- goto err;
- seq = &seqadj->seq[IP_CT_DIR_REPLY];
- if (dump_ct_seq_adj(skb, seq, CTA_SEQ_ADJ_REPLY) == -1)
- goto err;
- spin_unlock_bh(&ct->lock);
- return 0;
- err:
- spin_unlock_bh(&ct->lock);
- return -1;
- }
- static int ctnetlink_dump_ct_synproxy(struct sk_buff *skb, struct nf_conn *ct)
- {
- struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
- struct nlattr *nest_parms;
- if (!synproxy)
- return 0;
- nest_parms = nla_nest_start(skb, CTA_SYNPROXY);
- if (!nest_parms)
- goto nla_put_failure;
- if (nla_put_be32(skb, CTA_SYNPROXY_ISN, htonl(synproxy->isn)) ||
- nla_put_be32(skb, CTA_SYNPROXY_ITS, htonl(synproxy->its)) ||
- nla_put_be32(skb, CTA_SYNPROXY_TSOFF, htonl(synproxy->tsoff)))
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct)
- {
- __be32 id = (__force __be32)nf_ct_get_id(ct);
- if (nla_put_be32(skb, CTA_ID, id))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct)
- {
- if (nla_put_be32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- /* all these functions access ct->ext. Caller must either hold a reference
- * on ct or prevent its deletion by holding either the bucket spinlock or
- * pcpu dying list lock.
- */
- static int ctnetlink_dump_extinfo(struct sk_buff *skb,
- struct nf_conn *ct, u32 type)
- {
- if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
- ctnetlink_dump_timestamp(skb, ct) < 0 ||
- ctnetlink_dump_helpinfo(skb, ct) < 0 ||
- ctnetlink_dump_labels(skb, ct) < 0 ||
- ctnetlink_dump_ct_seq_adj(skb, ct) < 0 ||
- ctnetlink_dump_ct_synproxy(skb, ct) < 0)
- return -1;
- return 0;
- }
- static int ctnetlink_dump_info(struct sk_buff *skb, struct nf_conn *ct)
- {
- if (ctnetlink_dump_status(skb, ct) < 0 ||
- ctnetlink_dump_mark(skb, ct) < 0 ||
- ctnetlink_dump_secctx(skb, ct) < 0 ||
- ctnetlink_dump_id(skb, ct) < 0 ||
- ctnetlink_dump_use(skb, ct) < 0 ||
- ctnetlink_dump_master(skb, ct) < 0)
- return -1;
- if (!test_bit(IPS_OFFLOAD_BIT, &ct->status) &&
- (ctnetlink_dump_timeout(skb, ct) < 0 ||
- ctnetlink_dump_protoinfo(skb, ct) < 0))
- return -1;
- return 0;
- }
- static int
- ctnetlink_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
- struct nf_conn *ct, bool extinfo, unsigned int flags)
- {
- const struct nf_conntrack_zone *zone;
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct nlattr *nest_parms;
- unsigned int event;
- if (portid)
- flags |= NLM_F_MULTI;
- event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW);
- nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = nf_ct_l3num(ct);
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- zone = nf_ct_zone(ct);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_ORIG) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_REPL) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
- NF_CT_DEFAULT_ZONE_DIR) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_info(skb, ct) < 0)
- goto nla_put_failure;
- if (extinfo && ctnetlink_dump_extinfo(skb, ct, type) < 0)
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- return skb->len;
- nlmsg_failure:
- nla_put_failure:
- nlmsg_cancel(skb, nlh);
- return -1;
- }
- static const struct nla_policy cta_ip_nla_policy[CTA_IP_MAX + 1] = {
- [CTA_IP_V4_SRC] = { .type = NLA_U32 },
- [CTA_IP_V4_DST] = { .type = NLA_U32 },
- [CTA_IP_V6_SRC] = { .len = sizeof(__be32) * 4 },
- [CTA_IP_V6_DST] = { .len = sizeof(__be32) * 4 },
- };
- #if defined(CONFIG_NETFILTER_NETLINK_GLUE_CT) || defined(CONFIG_NF_CONNTRACK_EVENTS)
- static size_t ctnetlink_proto_size(const struct nf_conn *ct)
- {
- const struct nf_conntrack_l4proto *l4proto;
- size_t len, len4 = 0;
- len = nla_policy_len(cta_ip_nla_policy, CTA_IP_MAX + 1);
- len *= 3u; /* ORIG, REPLY, MASTER */
- l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
- len += l4proto->nlattr_size;
- if (l4proto->nlattr_tuple_size) {
- len4 = l4proto->nlattr_tuple_size();
- len4 *= 3u; /* ORIG, REPLY, MASTER */
- }
- return len + len4;
- }
- #endif
- static inline size_t ctnetlink_acct_size(const struct nf_conn *ct)
- {
- if (!nf_ct_ext_exist(ct, NF_CT_EXT_ACCT))
- return 0;
- return 2 * nla_total_size(0) /* CTA_COUNTERS_ORIG|REPL */
- + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_PACKETS */
- + 2 * nla_total_size_64bit(sizeof(uint64_t)) /* CTA_COUNTERS_BYTES */
- ;
- }
- static inline int ctnetlink_secctx_size(const struct nf_conn *ct)
- {
- #ifdef CONFIG_NF_CONNTRACK_SECMARK
- int len, ret;
- ret = security_secid_to_secctx(ct->secmark, NULL, &len);
- if (ret)
- return 0;
- return nla_total_size(0) /* CTA_SECCTX */
- + nla_total_size(sizeof(char) * len); /* CTA_SECCTX_NAME */
- #else
- return 0;
- #endif
- }
- static inline size_t ctnetlink_timestamp_size(const struct nf_conn *ct)
- {
- #ifdef CONFIG_NF_CONNTRACK_TIMESTAMP
- if (!nf_ct_ext_exist(ct, NF_CT_EXT_TSTAMP))
- return 0;
- return nla_total_size(0) + 2 * nla_total_size_64bit(sizeof(uint64_t));
- #else
- return 0;
- #endif
- }
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- static size_t ctnetlink_nlmsg_size(const struct nf_conn *ct)
- {
- return NLMSG_ALIGN(sizeof(struct nfgenmsg))
- + 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
- + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
- + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
- + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
- + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
- + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
- + ctnetlink_acct_size(ct)
- + ctnetlink_timestamp_size(ct)
- + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
- + nla_total_size(0) /* CTA_PROTOINFO */
- + nla_total_size(0) /* CTA_HELP */
- + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
- + ctnetlink_secctx_size(ct)
- #if IS_ENABLED(CONFIG_NF_NAT)
- + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
- + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
- #endif
- #ifdef CONFIG_NF_CONNTRACK_MARK
- + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
- #endif
- #ifdef CONFIG_NF_CONNTRACK_ZONES
- + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
- #endif
- + ctnetlink_proto_size(ct)
- + ctnetlink_label_size(ct)
- ;
- }
- static int
- ctnetlink_conntrack_event(unsigned int events, struct nf_ct_event *item)
- {
- const struct nf_conntrack_zone *zone;
- struct net *net;
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct nlattr *nest_parms;
- struct nf_conn *ct = item->ct;
- struct sk_buff *skb;
- unsigned int type;
- unsigned int flags = 0, group;
- int err;
- if (events & (1 << IPCT_DESTROY)) {
- type = IPCTNL_MSG_CT_DELETE;
- group = NFNLGRP_CONNTRACK_DESTROY;
- } else if (events & ((1 << IPCT_NEW) | (1 << IPCT_RELATED))) {
- type = IPCTNL_MSG_CT_NEW;
- flags = NLM_F_CREATE|NLM_F_EXCL;
- group = NFNLGRP_CONNTRACK_NEW;
- } else if (events) {
- type = IPCTNL_MSG_CT_NEW;
- group = NFNLGRP_CONNTRACK_UPDATE;
- } else
- return 0;
- net = nf_ct_net(ct);
- if (!item->report && !nfnetlink_has_listeners(net, group))
- return 0;
- skb = nlmsg_new(ctnetlink_nlmsg_size(ct), GFP_ATOMIC);
- if (skb == NULL)
- goto errout;
- type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, type);
- nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = nf_ct_l3num(ct);
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- zone = nf_ct_zone(ct);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_ORIG) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_REPL) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
- NF_CT_DEFAULT_ZONE_DIR) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_id(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_status(skb, ct) < 0)
- goto nla_put_failure;
- if (events & (1 << IPCT_DESTROY)) {
- if (ctnetlink_dump_acct(skb, ct, type) < 0 ||
- ctnetlink_dump_timestamp(skb, ct) < 0)
- goto nla_put_failure;
- } else {
- if (ctnetlink_dump_timeout(skb, ct) < 0)
- goto nla_put_failure;
- if (events & (1 << IPCT_PROTOINFO)
- && ctnetlink_dump_protoinfo(skb, ct) < 0)
- goto nla_put_failure;
- if ((events & (1 << IPCT_HELPER) || nfct_help(ct))
- && ctnetlink_dump_helpinfo(skb, ct) < 0)
- goto nla_put_failure;
- #ifdef CONFIG_NF_CONNTRACK_SECMARK
- if ((events & (1 << IPCT_SECMARK) || ct->secmark)
- && ctnetlink_dump_secctx(skb, ct) < 0)
- goto nla_put_failure;
- #endif
- if (events & (1 << IPCT_LABEL) &&
- ctnetlink_dump_labels(skb, ct) < 0)
- goto nla_put_failure;
- if (events & (1 << IPCT_RELATED) &&
- ctnetlink_dump_master(skb, ct) < 0)
- goto nla_put_failure;
- if (events & (1 << IPCT_SEQADJ) &&
- ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
- goto nla_put_failure;
- if (events & (1 << IPCT_SYNPROXY) &&
- ctnetlink_dump_ct_synproxy(skb, ct) < 0)
- goto nla_put_failure;
- }
- #ifdef CONFIG_NF_CONNTRACK_MARK
- if ((events & (1 << IPCT_MARK) || ct->mark)
- && ctnetlink_dump_mark(skb, ct) < 0)
- goto nla_put_failure;
- #endif
- nlmsg_end(skb, nlh);
- err = nfnetlink_send(skb, net, item->portid, group, item->report,
- GFP_ATOMIC);
- if (err == -ENOBUFS || err == -EAGAIN)
- return -ENOBUFS;
- return 0;
- nla_put_failure:
- nlmsg_cancel(skb, nlh);
- nlmsg_failure:
- kfree_skb(skb);
- errout:
- if (nfnetlink_set_err(net, 0, group, -ENOBUFS) > 0)
- return -ENOBUFS;
- return 0;
- }
- #endif /* CONFIG_NF_CONNTRACK_EVENTS */
- static int ctnetlink_done(struct netlink_callback *cb)
- {
- if (cb->args[1])
- nf_ct_put((struct nf_conn *)cb->args[1]);
- kfree(cb->data);
- return 0;
- }
- struct ctnetlink_filter {
- u8 family;
- u_int32_t orig_flags;
- u_int32_t reply_flags;
- struct nf_conntrack_tuple orig;
- struct nf_conntrack_tuple reply;
- struct nf_conntrack_zone zone;
- struct {
- u_int32_t val;
- u_int32_t mask;
- } mark;
- };
- static const struct nla_policy cta_filter_nla_policy[CTA_FILTER_MAX + 1] = {
- [CTA_FILTER_ORIG_FLAGS] = { .type = NLA_U32 },
- [CTA_FILTER_REPLY_FLAGS] = { .type = NLA_U32 },
- };
- static int ctnetlink_parse_filter(const struct nlattr *attr,
- struct ctnetlink_filter *filter)
- {
- struct nlattr *tb[CTA_FILTER_MAX + 1];
- int ret = 0;
- ret = nla_parse_nested(tb, CTA_FILTER_MAX, attr, cta_filter_nla_policy,
- NULL);
- if (ret)
- return ret;
- if (tb[CTA_FILTER_ORIG_FLAGS]) {
- filter->orig_flags = nla_get_u32(tb[CTA_FILTER_ORIG_FLAGS]);
- if (filter->orig_flags & ~CTA_FILTER_F_ALL)
- return -EOPNOTSUPP;
- }
- if (tb[CTA_FILTER_REPLY_FLAGS]) {
- filter->reply_flags = nla_get_u32(tb[CTA_FILTER_REPLY_FLAGS]);
- if (filter->reply_flags & ~CTA_FILTER_F_ALL)
- return -EOPNOTSUPP;
- }
- return 0;
- }
- static int ctnetlink_parse_zone(const struct nlattr *attr,
- struct nf_conntrack_zone *zone);
- static int ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
- struct nf_conntrack_tuple *tuple,
- u32 type, u_int8_t l3num,
- struct nf_conntrack_zone *zone,
- u_int32_t flags);
- static struct ctnetlink_filter *
- ctnetlink_alloc_filter(const struct nlattr * const cda[], u8 family)
- {
- struct ctnetlink_filter *filter;
- int err;
- #ifndef CONFIG_NF_CONNTRACK_MARK
- if (cda[CTA_MARK] || cda[CTA_MARK_MASK])
- return ERR_PTR(-EOPNOTSUPP);
- #endif
- filter = kzalloc(sizeof(*filter), GFP_KERNEL);
- if (filter == NULL)
- return ERR_PTR(-ENOMEM);
- filter->family = family;
- #ifdef CONFIG_NF_CONNTRACK_MARK
- if (cda[CTA_MARK]) {
- filter->mark.val = ntohl(nla_get_be32(cda[CTA_MARK]));
- if (cda[CTA_MARK_MASK])
- filter->mark.mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
- else
- filter->mark.mask = 0xffffffff;
- } else if (cda[CTA_MARK_MASK]) {
- err = -EINVAL;
- goto err_filter;
- }
- #endif
- if (!cda[CTA_FILTER])
- return filter;
- err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone);
- if (err < 0)
- goto err_filter;
- err = ctnetlink_parse_filter(cda[CTA_FILTER], filter);
- if (err < 0)
- goto err_filter;
- if (filter->orig_flags) {
- if (!cda[CTA_TUPLE_ORIG]) {
- err = -EINVAL;
- goto err_filter;
- }
- err = ctnetlink_parse_tuple_filter(cda, &filter->orig,
- CTA_TUPLE_ORIG,
- filter->family,
- &filter->zone,
- filter->orig_flags);
- if (err < 0)
- goto err_filter;
- }
- if (filter->reply_flags) {
- if (!cda[CTA_TUPLE_REPLY]) {
- err = -EINVAL;
- goto err_filter;
- }
- err = ctnetlink_parse_tuple_filter(cda, &filter->reply,
- CTA_TUPLE_REPLY,
- filter->family,
- &filter->zone,
- filter->reply_flags);
- if (err < 0)
- goto err_filter;
- }
- return filter;
- err_filter:
- kfree(filter);
- return ERR_PTR(err);
- }
- static bool ctnetlink_needs_filter(u8 family, const struct nlattr * const *cda)
- {
- return family || cda[CTA_MARK] || cda[CTA_FILTER];
- }
- static int ctnetlink_start(struct netlink_callback *cb)
- {
- const struct nlattr * const *cda = cb->data;
- struct ctnetlink_filter *filter = NULL;
- struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
- u8 family = nfmsg->nfgen_family;
- if (ctnetlink_needs_filter(family, cda)) {
- filter = ctnetlink_alloc_filter(cda, family);
- if (IS_ERR(filter))
- return PTR_ERR(filter);
- }
- cb->data = filter;
- return 0;
- }
- static int ctnetlink_filter_match_tuple(struct nf_conntrack_tuple *filter_tuple,
- struct nf_conntrack_tuple *ct_tuple,
- u_int32_t flags, int family)
- {
- switch (family) {
- case NFPROTO_IPV4:
- if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
- filter_tuple->src.u3.ip != ct_tuple->src.u3.ip)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
- filter_tuple->dst.u3.ip != ct_tuple->dst.u3.ip)
- return 0;
- break;
- case NFPROTO_IPV6:
- if ((flags & CTA_FILTER_FLAG(CTA_IP_SRC)) &&
- !ipv6_addr_cmp(&filter_tuple->src.u3.in6,
- &ct_tuple->src.u3.in6))
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_IP_DST)) &&
- !ipv6_addr_cmp(&filter_tuple->dst.u3.in6,
- &ct_tuple->dst.u3.in6))
- return 0;
- break;
- }
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) &&
- filter_tuple->dst.protonum != ct_tuple->dst.protonum)
- return 0;
- switch (ct_tuple->dst.protonum) {
- case IPPROTO_TCP:
- case IPPROTO_UDP:
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_SRC_PORT)) &&
- filter_tuple->src.u.tcp.port != ct_tuple->src.u.tcp.port)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_DST_PORT)) &&
- filter_tuple->dst.u.tcp.port != ct_tuple->dst.u.tcp.port)
- return 0;
- break;
- case IPPROTO_ICMP:
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_TYPE)) &&
- filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_CODE)) &&
- filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMP_ID)) &&
- filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
- return 0;
- break;
- case IPPROTO_ICMPV6:
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_TYPE)) &&
- filter_tuple->dst.u.icmp.type != ct_tuple->dst.u.icmp.type)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_CODE)) &&
- filter_tuple->dst.u.icmp.code != ct_tuple->dst.u.icmp.code)
- return 0;
- if ((flags & CTA_FILTER_FLAG(CTA_PROTO_ICMPV6_ID)) &&
- filter_tuple->src.u.icmp.id != ct_tuple->src.u.icmp.id)
- return 0;
- break;
- }
- return 1;
- }
- static int ctnetlink_filter_match(struct nf_conn *ct, void *data)
- {
- struct ctnetlink_filter *filter = data;
- struct nf_conntrack_tuple *tuple;
- if (filter == NULL)
- goto out;
- /* Match entries of a given L3 protocol number.
- * If it is not specified, ie. l3proto == 0,
- * then match everything.
- */
- if (filter->family && nf_ct_l3num(ct) != filter->family)
- goto ignore_entry;
- if (filter->orig_flags) {
- tuple = nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL);
- if (!ctnetlink_filter_match_tuple(&filter->orig, tuple,
- filter->orig_flags,
- filter->family))
- goto ignore_entry;
- }
- if (filter->reply_flags) {
- tuple = nf_ct_tuple(ct, IP_CT_DIR_REPLY);
- if (!ctnetlink_filter_match_tuple(&filter->reply, tuple,
- filter->reply_flags,
- filter->family))
- goto ignore_entry;
- }
- #ifdef CONFIG_NF_CONNTRACK_MARK
- if ((ct->mark & filter->mark.mask) != filter->mark.val)
- goto ignore_entry;
- #endif
- out:
- return 1;
- ignore_entry:
- return 0;
- }
- static int
- ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
- {
- unsigned int flags = cb->data ? NLM_F_DUMP_FILTERED : 0;
- struct net *net = sock_net(skb->sk);
- struct nf_conn *ct, *last;
- struct nf_conntrack_tuple_hash *h;
- struct hlist_nulls_node *n;
- struct nf_conn *nf_ct_evict[8];
- int res, i;
- spinlock_t *lockp;
- last = (struct nf_conn *)cb->args[1];
- i = 0;
- local_bh_disable();
- for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) {
- restart:
- while (i) {
- i--;
- if (nf_ct_should_gc(nf_ct_evict[i]))
- nf_ct_kill(nf_ct_evict[i]);
- nf_ct_put(nf_ct_evict[i]);
- }
- lockp = &nf_conntrack_locks[cb->args[0] % CONNTRACK_LOCKS];
- nf_conntrack_lock(lockp);
- if (cb->args[0] >= nf_conntrack_htable_size) {
- spin_unlock(lockp);
- goto out;
- }
- hlist_nulls_for_each_entry(h, n, &nf_conntrack_hash[cb->args[0]],
- hnnode) {
- if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL)
- continue;
- ct = nf_ct_tuplehash_to_ctrack(h);
- if (nf_ct_is_expired(ct)) {
- if (i < ARRAY_SIZE(nf_ct_evict) &&
- atomic_inc_not_zero(&ct->ct_general.use))
- nf_ct_evict[i++] = ct;
- continue;
- }
- if (!net_eq(net, nf_ct_net(ct)))
- continue;
- if (cb->args[1]) {
- if (ct != last)
- continue;
- cb->args[1] = 0;
- }
- if (!ctnetlink_filter_match(ct, cb->data))
- continue;
- res =
- ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
- ct, true, flags);
- if (res < 0) {
- nf_conntrack_get(&ct->ct_general);
- cb->args[1] = (unsigned long)ct;
- spin_unlock(lockp);
- goto out;
- }
- }
- spin_unlock(lockp);
- if (cb->args[1]) {
- cb->args[1] = 0;
- goto restart;
- }
- }
- out:
- local_bh_enable();
- if (last) {
- /* nf ct hash resize happened, now clear the leftover. */
- if ((struct nf_conn *)cb->args[1] == last)
- cb->args[1] = 0;
- nf_ct_put(last);
- }
- while (i) {
- i--;
- if (nf_ct_should_gc(nf_ct_evict[i]))
- nf_ct_kill(nf_ct_evict[i]);
- nf_ct_put(nf_ct_evict[i]);
- }
- return skb->len;
- }
- static int ipv4_nlattr_to_tuple(struct nlattr *tb[],
- struct nf_conntrack_tuple *t,
- u_int32_t flags)
- {
- if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
- if (!tb[CTA_IP_V4_SRC])
- return -EINVAL;
- t->src.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_SRC]);
- }
- if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
- if (!tb[CTA_IP_V4_DST])
- return -EINVAL;
- t->dst.u3.ip = nla_get_in_addr(tb[CTA_IP_V4_DST]);
- }
- return 0;
- }
- static int ipv6_nlattr_to_tuple(struct nlattr *tb[],
- struct nf_conntrack_tuple *t,
- u_int32_t flags)
- {
- if (flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
- if (!tb[CTA_IP_V6_SRC])
- return -EINVAL;
- t->src.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_SRC]);
- }
- if (flags & CTA_FILTER_FLAG(CTA_IP_DST)) {
- if (!tb[CTA_IP_V6_DST])
- return -EINVAL;
- t->dst.u3.in6 = nla_get_in6_addr(tb[CTA_IP_V6_DST]);
- }
- return 0;
- }
- static int ctnetlink_parse_tuple_ip(struct nlattr *attr,
- struct nf_conntrack_tuple *tuple,
- u_int32_t flags)
- {
- struct nlattr *tb[CTA_IP_MAX+1];
- int ret = 0;
- ret = nla_parse_nested_deprecated(tb, CTA_IP_MAX, attr, NULL, NULL);
- if (ret < 0)
- return ret;
- ret = nla_validate_nested_deprecated(attr, CTA_IP_MAX,
- cta_ip_nla_policy, NULL);
- if (ret)
- return ret;
- switch (tuple->src.l3num) {
- case NFPROTO_IPV4:
- ret = ipv4_nlattr_to_tuple(tb, tuple, flags);
- break;
- case NFPROTO_IPV6:
- ret = ipv6_nlattr_to_tuple(tb, tuple, flags);
- break;
- }
- return ret;
- }
- static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = {
- [CTA_PROTO_NUM] = { .type = NLA_U8 },
- };
- static int ctnetlink_parse_tuple_proto(struct nlattr *attr,
- struct nf_conntrack_tuple *tuple,
- u_int32_t flags)
- {
- const struct nf_conntrack_l4proto *l4proto;
- struct nlattr *tb[CTA_PROTO_MAX+1];
- int ret = 0;
- ret = nla_parse_nested_deprecated(tb, CTA_PROTO_MAX, attr,
- proto_nla_policy, NULL);
- if (ret < 0)
- return ret;
- if (!(flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)))
- return 0;
- if (!tb[CTA_PROTO_NUM])
- return -EINVAL;
- tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]);
- rcu_read_lock();
- l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
- if (likely(l4proto->nlattr_to_tuple)) {
- ret = nla_validate_nested_deprecated(attr, CTA_PROTO_MAX,
- l4proto->nla_policy,
- NULL);
- if (ret == 0)
- ret = l4proto->nlattr_to_tuple(tb, tuple, flags);
- }
- rcu_read_unlock();
- return ret;
- }
- static int
- ctnetlink_parse_zone(const struct nlattr *attr,
- struct nf_conntrack_zone *zone)
- {
- nf_ct_zone_init(zone, NF_CT_DEFAULT_ZONE_ID,
- NF_CT_DEFAULT_ZONE_DIR, 0);
- #ifdef CONFIG_NF_CONNTRACK_ZONES
- if (attr)
- zone->id = ntohs(nla_get_be16(attr));
- #else
- if (attr)
- return -EOPNOTSUPP;
- #endif
- return 0;
- }
- static int
- ctnetlink_parse_tuple_zone(struct nlattr *attr, enum ctattr_type type,
- struct nf_conntrack_zone *zone)
- {
- int ret;
- if (zone->id != NF_CT_DEFAULT_ZONE_ID)
- return -EINVAL;
- ret = ctnetlink_parse_zone(attr, zone);
- if (ret < 0)
- return ret;
- if (type == CTA_TUPLE_REPLY)
- zone->dir = NF_CT_ZONE_DIR_REPL;
- else
- zone->dir = NF_CT_ZONE_DIR_ORIG;
- return 0;
- }
- static const struct nla_policy tuple_nla_policy[CTA_TUPLE_MAX+1] = {
- [CTA_TUPLE_IP] = { .type = NLA_NESTED },
- [CTA_TUPLE_PROTO] = { .type = NLA_NESTED },
- [CTA_TUPLE_ZONE] = { .type = NLA_U16 },
- };
- #define CTA_FILTER_F_ALL_CTA_PROTO \
- (CTA_FILTER_F_CTA_PROTO_SRC_PORT | \
- CTA_FILTER_F_CTA_PROTO_DST_PORT | \
- CTA_FILTER_F_CTA_PROTO_ICMP_TYPE | \
- CTA_FILTER_F_CTA_PROTO_ICMP_CODE | \
- CTA_FILTER_F_CTA_PROTO_ICMP_ID | \
- CTA_FILTER_F_CTA_PROTO_ICMPV6_TYPE | \
- CTA_FILTER_F_CTA_PROTO_ICMPV6_CODE | \
- CTA_FILTER_F_CTA_PROTO_ICMPV6_ID)
- static int
- ctnetlink_parse_tuple_filter(const struct nlattr * const cda[],
- struct nf_conntrack_tuple *tuple, u32 type,
- u_int8_t l3num, struct nf_conntrack_zone *zone,
- u_int32_t flags)
- {
- struct nlattr *tb[CTA_TUPLE_MAX+1];
- int err;
- memset(tuple, 0, sizeof(*tuple));
- err = nla_parse_nested_deprecated(tb, CTA_TUPLE_MAX, cda[type],
- tuple_nla_policy, NULL);
- if (err < 0)
- return err;
- if (l3num != NFPROTO_IPV4 && l3num != NFPROTO_IPV6)
- return -EOPNOTSUPP;
- tuple->src.l3num = l3num;
- if (flags & CTA_FILTER_FLAG(CTA_IP_DST) ||
- flags & CTA_FILTER_FLAG(CTA_IP_SRC)) {
- if (!tb[CTA_TUPLE_IP])
- return -EINVAL;
- err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple, flags);
- if (err < 0)
- return err;
- }
- if (flags & CTA_FILTER_FLAG(CTA_PROTO_NUM)) {
- if (!tb[CTA_TUPLE_PROTO])
- return -EINVAL;
- err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple, flags);
- if (err < 0)
- return err;
- } else if (flags & CTA_FILTER_FLAG(ALL_CTA_PROTO)) {
- /* Can't manage proto flags without a protonum */
- return -EINVAL;
- }
- if ((flags & CTA_FILTER_FLAG(CTA_TUPLE_ZONE)) && tb[CTA_TUPLE_ZONE]) {
- if (!zone)
- return -EINVAL;
- err = ctnetlink_parse_tuple_zone(tb[CTA_TUPLE_ZONE],
- type, zone);
- if (err < 0)
- return err;
- }
- /* orig and expect tuples get DIR_ORIGINAL */
- if (type == CTA_TUPLE_REPLY)
- tuple->dst.dir = IP_CT_DIR_REPLY;
- else
- tuple->dst.dir = IP_CT_DIR_ORIGINAL;
- return 0;
- }
- static int
- ctnetlink_parse_tuple(const struct nlattr * const cda[],
- struct nf_conntrack_tuple *tuple, u32 type,
- u_int8_t l3num, struct nf_conntrack_zone *zone)
- {
- return ctnetlink_parse_tuple_filter(cda, tuple, type, l3num, zone,
- CTA_FILTER_FLAG(ALL));
- }
- static const struct nla_policy help_nla_policy[CTA_HELP_MAX+1] = {
- [CTA_HELP_NAME] = { .type = NLA_NUL_STRING,
- .len = NF_CT_HELPER_NAME_LEN - 1 },
- };
- static int ctnetlink_parse_help(const struct nlattr *attr, char **helper_name,
- struct nlattr **helpinfo)
- {
- int err;
- struct nlattr *tb[CTA_HELP_MAX+1];
- err = nla_parse_nested_deprecated(tb, CTA_HELP_MAX, attr,
- help_nla_policy, NULL);
- if (err < 0)
- return err;
- if (!tb[CTA_HELP_NAME])
- return -EINVAL;
- *helper_name = nla_data(tb[CTA_HELP_NAME]);
- if (tb[CTA_HELP_INFO])
- *helpinfo = tb[CTA_HELP_INFO];
- return 0;
- }
- static const struct nla_policy ct_nla_policy[CTA_MAX+1] = {
- [CTA_TUPLE_ORIG] = { .type = NLA_NESTED },
- [CTA_TUPLE_REPLY] = { .type = NLA_NESTED },
- [CTA_STATUS] = { .type = NLA_U32 },
- [CTA_PROTOINFO] = { .type = NLA_NESTED },
- [CTA_HELP] = { .type = NLA_NESTED },
- [CTA_NAT_SRC] = { .type = NLA_NESTED },
- [CTA_TIMEOUT] = { .type = NLA_U32 },
- [CTA_MARK] = { .type = NLA_U32 },
- [CTA_ID] = { .type = NLA_U32 },
- [CTA_NAT_DST] = { .type = NLA_NESTED },
- [CTA_TUPLE_MASTER] = { .type = NLA_NESTED },
- [CTA_NAT_SEQ_ADJ_ORIG] = { .type = NLA_NESTED },
- [CTA_NAT_SEQ_ADJ_REPLY] = { .type = NLA_NESTED },
- [CTA_ZONE] = { .type = NLA_U16 },
- [CTA_MARK_MASK] = { .type = NLA_U32 },
- [CTA_LABELS] = { .type = NLA_BINARY,
- .len = NF_CT_LABELS_MAX_SIZE },
- [CTA_LABELS_MASK] = { .type = NLA_BINARY,
- .len = NF_CT_LABELS_MAX_SIZE },
- [CTA_FILTER] = { .type = NLA_NESTED },
- };
- static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data)
- {
- if (test_bit(IPS_OFFLOAD_BIT, &ct->status))
- return 0;
- return ctnetlink_filter_match(ct, data);
- }
- static int ctnetlink_flush_conntrack(struct net *net,
- const struct nlattr * const cda[],
- u32 portid, int report, u8 family)
- {
- struct ctnetlink_filter *filter = NULL;
- if (ctnetlink_needs_filter(family, cda)) {
- if (cda[CTA_FILTER])
- return -EOPNOTSUPP;
- filter = ctnetlink_alloc_filter(cda, family);
- if (IS_ERR(filter))
- return PTR_ERR(filter);
- }
- nf_ct_iterate_cleanup_net(net, ctnetlink_flush_iterate, filter,
- portid, report);
- kfree(filter);
- return 0;
- }
- static int ctnetlink_del_conntrack(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_tuple_hash *h;
- struct nf_conntrack_tuple tuple;
- struct nf_conn *ct;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- struct nf_conntrack_zone zone;
- int err;
- err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
- if (err < 0)
- return err;
- if (cda[CTA_TUPLE_ORIG])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
- nfmsg->nfgen_family, &zone);
- else if (cda[CTA_TUPLE_REPLY])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
- nfmsg->nfgen_family, &zone);
- else {
- u_int8_t u3 = nfmsg->version ? nfmsg->nfgen_family : AF_UNSPEC;
- return ctnetlink_flush_conntrack(net, cda,
- NETLINK_CB(skb).portid,
- nlmsg_report(nlh), u3);
- }
- if (err < 0)
- return err;
- h = nf_conntrack_find_get(net, &zone, &tuple);
- if (!h)
- return -ENOENT;
- ct = nf_ct_tuplehash_to_ctrack(h);
- if (test_bit(IPS_OFFLOAD_BIT, &ct->status)) {
- nf_ct_put(ct);
- return -EBUSY;
- }
- if (cda[CTA_ID]) {
- __be32 id = nla_get_be32(cda[CTA_ID]);
- if (id != (__force __be32)nf_ct_get_id(ct)) {
- nf_ct_put(ct);
- return -ENOENT;
- }
- }
- nf_ct_delete(ct, NETLINK_CB(skb).portid, nlmsg_report(nlh));
- nf_ct_put(ct);
- return 0;
- }
- static int ctnetlink_get_conntrack(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_tuple_hash *h;
- struct nf_conntrack_tuple tuple;
- struct nf_conn *ct;
- struct sk_buff *skb2 = NULL;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_zone zone;
- int err;
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct netlink_dump_control c = {
- .start = ctnetlink_start,
- .dump = ctnetlink_dump_table,
- .done = ctnetlink_done,
- .data = (void *)cda,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
- if (err < 0)
- return err;
- if (cda[CTA_TUPLE_ORIG])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG,
- u3, &zone);
- else if (cda[CTA_TUPLE_REPLY])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY,
- u3, &zone);
- else
- return -EINVAL;
- if (err < 0)
- return err;
- h = nf_conntrack_find_get(net, &zone, &tuple);
- if (!h)
- return -ENOENT;
- ct = nf_ct_tuplehash_to_ctrack(h);
- err = -ENOMEM;
- skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (skb2 == NULL) {
- nf_ct_put(ct);
- return -ENOMEM;
- }
- err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, nlh->nlmsg_seq,
- NFNL_MSG_TYPE(nlh->nlmsg_type), ct, true, 0);
- nf_ct_put(ct);
- if (err <= 0)
- goto free;
- err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (err < 0)
- goto out;
- return 0;
- free:
- kfree_skb(skb2);
- out:
- /* this avoids a loop in nfnetlink. */
- return err == -EAGAIN ? -ENOBUFS : err;
- }
- static int ctnetlink_done_list(struct netlink_callback *cb)
- {
- if (cb->args[1])
- nf_ct_put((struct nf_conn *)cb->args[1]);
- return 0;
- }
- static int
- ctnetlink_dump_list(struct sk_buff *skb, struct netlink_callback *cb, bool dying)
- {
- struct nf_conn *ct, *last;
- struct nf_conntrack_tuple_hash *h;
- struct hlist_nulls_node *n;
- struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
- u_int8_t l3proto = nfmsg->nfgen_family;
- int res;
- int cpu;
- struct hlist_nulls_head *list;
- struct net *net = sock_net(skb->sk);
- if (cb->args[2])
- return 0;
- last = (struct nf_conn *)cb->args[1];
- for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
- struct ct_pcpu *pcpu;
- if (!cpu_possible(cpu))
- continue;
- pcpu = per_cpu_ptr(net->ct.pcpu_lists, cpu);
- spin_lock_bh(&pcpu->lock);
- list = dying ? &pcpu->dying : &pcpu->unconfirmed;
- restart:
- hlist_nulls_for_each_entry(h, n, list, hnnode) {
- ct = nf_ct_tuplehash_to_ctrack(h);
- if (l3proto && nf_ct_l3num(ct) != l3proto)
- continue;
- if (cb->args[1]) {
- if (ct != last)
- continue;
- cb->args[1] = 0;
- }
- /* We can't dump extension info for the unconfirmed
- * list because unconfirmed conntracks can have
- * ct->ext reallocated (and thus freed).
- *
- * In the dying list case ct->ext can't be free'd
- * until after we drop pcpu->lock.
- */
- res = ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- NFNL_MSG_TYPE(cb->nlh->nlmsg_type),
- ct, dying ? true : false, 0);
- if (res < 0) {
- if (!atomic_inc_not_zero(&ct->ct_general.use))
- continue;
- cb->args[0] = cpu;
- cb->args[1] = (unsigned long)ct;
- spin_unlock_bh(&pcpu->lock);
- goto out;
- }
- }
- if (cb->args[1]) {
- cb->args[1] = 0;
- goto restart;
- }
- spin_unlock_bh(&pcpu->lock);
- }
- cb->args[2] = 1;
- out:
- if (last)
- nf_ct_put(last);
- return skb->len;
- }
- static int
- ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb)
- {
- return ctnetlink_dump_list(skb, cb, true);
- }
- static int ctnetlink_get_ct_dying(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct netlink_dump_control c = {
- .dump = ctnetlink_dump_dying,
- .done = ctnetlink_done_list,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- return -EOPNOTSUPP;
- }
- static int
- ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb)
- {
- return ctnetlink_dump_list(skb, cb, false);
- }
- static int ctnetlink_get_ct_unconfirmed(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct netlink_dump_control c = {
- .dump = ctnetlink_dump_unconfirmed,
- .done = ctnetlink_done_list,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- return -EOPNOTSUPP;
- }
- #if IS_ENABLED(CONFIG_NF_NAT)
- static int
- ctnetlink_parse_nat_setup(struct nf_conn *ct,
- enum nf_nat_manip_type manip,
- const struct nlattr *attr)
- __must_hold(RCU)
- {
- struct nf_nat_hook *nat_hook;
- int err;
- nat_hook = rcu_dereference(nf_nat_hook);
- if (!nat_hook) {
- #ifdef CONFIG_MODULES
- rcu_read_unlock();
- nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
- if (request_module("nf-nat") < 0) {
- nfnl_lock(NFNL_SUBSYS_CTNETLINK);
- rcu_read_lock();
- return -EOPNOTSUPP;
- }
- nfnl_lock(NFNL_SUBSYS_CTNETLINK);
- rcu_read_lock();
- nat_hook = rcu_dereference(nf_nat_hook);
- if (nat_hook)
- return -EAGAIN;
- #endif
- return -EOPNOTSUPP;
- }
- err = nat_hook->parse_nat_setup(ct, manip, attr);
- if (err == -EAGAIN) {
- #ifdef CONFIG_MODULES
- rcu_read_unlock();
- nfnl_unlock(NFNL_SUBSYS_CTNETLINK);
- if (request_module("nf-nat-%u", nf_ct_l3num(ct)) < 0) {
- nfnl_lock(NFNL_SUBSYS_CTNETLINK);
- rcu_read_lock();
- return -EOPNOTSUPP;
- }
- nfnl_lock(NFNL_SUBSYS_CTNETLINK);
- rcu_read_lock();
- #else
- err = -EOPNOTSUPP;
- #endif
- }
- return err;
- }
- #endif
- static void
- __ctnetlink_change_status(struct nf_conn *ct, unsigned long on,
- unsigned long off)
- {
- unsigned int bit;
- /* Ignore these unchangable bits */
- on &= ~IPS_UNCHANGEABLE_MASK;
- off &= ~IPS_UNCHANGEABLE_MASK;
- for (bit = 0; bit < __IPS_MAX_BIT; bit++) {
- if (on & (1 << bit))
- set_bit(bit, &ct->status);
- else if (off & (1 << bit))
- clear_bit(bit, &ct->status);
- }
- }
- static int
- ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[])
- {
- unsigned long d;
- unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
- d = ct->status ^ status;
- if (d & (IPS_EXPECTED|IPS_CONFIRMED|IPS_DYING))
- /* unchangeable */
- return -EBUSY;
- if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
- /* SEEN_REPLY bit can only be set */
- return -EBUSY;
- if (d & IPS_ASSURED && !(status & IPS_ASSURED))
- /* ASSURED bit can only be set */
- return -EBUSY;
- __ctnetlink_change_status(ct, status, 0);
- return 0;
- }
- static int
- ctnetlink_setup_nat(struct nf_conn *ct, const struct nlattr * const cda[])
- {
- #if IS_ENABLED(CONFIG_NF_NAT)
- int ret;
- if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
- return 0;
- ret = ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_DST,
- cda[CTA_NAT_DST]);
- if (ret < 0)
- return ret;
- return ctnetlink_parse_nat_setup(ct, NF_NAT_MANIP_SRC,
- cda[CTA_NAT_SRC]);
- #else
- if (!cda[CTA_NAT_DST] && !cda[CTA_NAT_SRC])
- return 0;
- return -EOPNOTSUPP;
- #endif
- }
- static int ctnetlink_change_helper(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- struct nf_conntrack_helper *helper;
- struct nf_conn_help *help = nfct_help(ct);
- char *helpname = NULL;
- struct nlattr *helpinfo = NULL;
- int err;
- err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
- if (err < 0)
- return err;
- /* don't change helper of sibling connections */
- if (ct->master) {
- /* If we try to change the helper to the same thing twice,
- * treat the second attempt as a no-op instead of returning
- * an error.
- */
- err = -EBUSY;
- if (help) {
- rcu_read_lock();
- helper = rcu_dereference(help->helper);
- if (helper && !strcmp(helper->name, helpname))
- err = 0;
- rcu_read_unlock();
- }
- return err;
- }
- if (!strcmp(helpname, "")) {
- if (help && help->helper) {
- /* we had a helper before ... */
- nf_ct_remove_expectations(ct);
- RCU_INIT_POINTER(help->helper, NULL);
- }
- return 0;
- }
- rcu_read_lock();
- helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper == NULL) {
- rcu_read_unlock();
- return -EOPNOTSUPP;
- }
- if (help) {
- if (help->helper == helper) {
- /* update private helper data if allowed. */
- if (helper->from_nlattr)
- helper->from_nlattr(helpinfo, ct);
- err = 0;
- } else
- err = -EBUSY;
- } else {
- /* we cannot set a helper for an existing conntrack */
- err = -EOPNOTSUPP;
- }
- rcu_read_unlock();
- return err;
- }
- static int ctnetlink_change_timeout(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- u64 timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
- if (timeout > INT_MAX)
- timeout = INT_MAX;
- WRITE_ONCE(ct->timeout, nfct_time_stamp + (u32)timeout);
- if (test_bit(IPS_DYING_BIT, &ct->status))
- return -ETIME;
- return 0;
- }
- #if defined(CONFIG_NF_CONNTRACK_MARK)
- static void ctnetlink_change_mark(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- u32 mark, newmark, mask = 0;
- if (cda[CTA_MARK_MASK])
- mask = ~ntohl(nla_get_be32(cda[CTA_MARK_MASK]));
- mark = ntohl(nla_get_be32(cda[CTA_MARK]));
- newmark = (ct->mark & mask) ^ mark;
- if (newmark != ct->mark)
- ct->mark = newmark;
- }
- #endif
- static const struct nla_policy protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
- [CTA_PROTOINFO_TCP] = { .type = NLA_NESTED },
- [CTA_PROTOINFO_DCCP] = { .type = NLA_NESTED },
- [CTA_PROTOINFO_SCTP] = { .type = NLA_NESTED },
- };
- static int ctnetlink_change_protoinfo(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- const struct nlattr *attr = cda[CTA_PROTOINFO];
- const struct nf_conntrack_l4proto *l4proto;
- struct nlattr *tb[CTA_PROTOINFO_MAX+1];
- int err = 0;
- err = nla_parse_nested_deprecated(tb, CTA_PROTOINFO_MAX, attr,
- protoinfo_policy, NULL);
- if (err < 0)
- return err;
- l4proto = nf_ct_l4proto_find(nf_ct_protonum(ct));
- if (l4proto->from_nlattr)
- err = l4proto->from_nlattr(tb, ct);
- return err;
- }
- static const struct nla_policy seqadj_policy[CTA_SEQADJ_MAX+1] = {
- [CTA_SEQADJ_CORRECTION_POS] = { .type = NLA_U32 },
- [CTA_SEQADJ_OFFSET_BEFORE] = { .type = NLA_U32 },
- [CTA_SEQADJ_OFFSET_AFTER] = { .type = NLA_U32 },
- };
- static int change_seq_adj(struct nf_ct_seqadj *seq,
- const struct nlattr * const attr)
- {
- int err;
- struct nlattr *cda[CTA_SEQADJ_MAX+1];
- err = nla_parse_nested_deprecated(cda, CTA_SEQADJ_MAX, attr,
- seqadj_policy, NULL);
- if (err < 0)
- return err;
- if (!cda[CTA_SEQADJ_CORRECTION_POS])
- return -EINVAL;
- seq->correction_pos =
- ntohl(nla_get_be32(cda[CTA_SEQADJ_CORRECTION_POS]));
- if (!cda[CTA_SEQADJ_OFFSET_BEFORE])
- return -EINVAL;
- seq->offset_before =
- ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_BEFORE]));
- if (!cda[CTA_SEQADJ_OFFSET_AFTER])
- return -EINVAL;
- seq->offset_after =
- ntohl(nla_get_be32(cda[CTA_SEQADJ_OFFSET_AFTER]));
- return 0;
- }
- static int
- ctnetlink_change_seq_adj(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- struct nf_conn_seqadj *seqadj = nfct_seqadj(ct);
- int ret = 0;
- if (!seqadj)
- return 0;
- spin_lock_bh(&ct->lock);
- if (cda[CTA_SEQ_ADJ_ORIG]) {
- ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_ORIGINAL],
- cda[CTA_SEQ_ADJ_ORIG]);
- if (ret < 0)
- goto err;
- set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
- }
- if (cda[CTA_SEQ_ADJ_REPLY]) {
- ret = change_seq_adj(&seqadj->seq[IP_CT_DIR_REPLY],
- cda[CTA_SEQ_ADJ_REPLY]);
- if (ret < 0)
- goto err;
- set_bit(IPS_SEQ_ADJUST_BIT, &ct->status);
- }
- spin_unlock_bh(&ct->lock);
- return 0;
- err:
- spin_unlock_bh(&ct->lock);
- return ret;
- }
- static const struct nla_policy synproxy_policy[CTA_SYNPROXY_MAX + 1] = {
- [CTA_SYNPROXY_ISN] = { .type = NLA_U32 },
- [CTA_SYNPROXY_ITS] = { .type = NLA_U32 },
- [CTA_SYNPROXY_TSOFF] = { .type = NLA_U32 },
- };
- static int ctnetlink_change_synproxy(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- struct nf_conn_synproxy *synproxy = nfct_synproxy(ct);
- struct nlattr *tb[CTA_SYNPROXY_MAX + 1];
- int err;
- if (!synproxy)
- return 0;
- err = nla_parse_nested_deprecated(tb, CTA_SYNPROXY_MAX,
- cda[CTA_SYNPROXY], synproxy_policy,
- NULL);
- if (err < 0)
- return err;
- if (!tb[CTA_SYNPROXY_ISN] ||
- !tb[CTA_SYNPROXY_ITS] ||
- !tb[CTA_SYNPROXY_TSOFF])
- return -EINVAL;
- synproxy->isn = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ISN]));
- synproxy->its = ntohl(nla_get_be32(tb[CTA_SYNPROXY_ITS]));
- synproxy->tsoff = ntohl(nla_get_be32(tb[CTA_SYNPROXY_TSOFF]));
- return 0;
- }
- static int
- ctnetlink_attach_labels(struct nf_conn *ct, const struct nlattr * const cda[])
- {
- #ifdef CONFIG_NF_CONNTRACK_LABELS
- size_t len = nla_len(cda[CTA_LABELS]);
- const void *mask = cda[CTA_LABELS_MASK];
- if (len & (sizeof(u32)-1)) /* must be multiple of u32 */
- return -EINVAL;
- if (mask) {
- if (nla_len(cda[CTA_LABELS_MASK]) == 0 ||
- nla_len(cda[CTA_LABELS_MASK]) != len)
- return -EINVAL;
- mask = nla_data(cda[CTA_LABELS_MASK]);
- }
- len /= sizeof(u32);
- return nf_connlabels_replace(ct, nla_data(cda[CTA_LABELS]), mask, len);
- #else
- return -EOPNOTSUPP;
- #endif
- }
- static int
- ctnetlink_change_conntrack(struct nf_conn *ct,
- const struct nlattr * const cda[])
- {
- int err;
- /* only allow NAT changes and master assignation for new conntracks */
- if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST] || cda[CTA_TUPLE_MASTER])
- return -EOPNOTSUPP;
- if (cda[CTA_HELP]) {
- err = ctnetlink_change_helper(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_TIMEOUT]) {
- err = ctnetlink_change_timeout(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_STATUS]) {
- err = ctnetlink_change_status(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_PROTOINFO]) {
- err = ctnetlink_change_protoinfo(ct, cda);
- if (err < 0)
- return err;
- }
- #if defined(CONFIG_NF_CONNTRACK_MARK)
- if (cda[CTA_MARK])
- ctnetlink_change_mark(ct, cda);
- #endif
- if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
- err = ctnetlink_change_seq_adj(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_SYNPROXY]) {
- err = ctnetlink_change_synproxy(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_LABELS]) {
- err = ctnetlink_attach_labels(ct, cda);
- if (err < 0)
- return err;
- }
- return 0;
- }
- static struct nf_conn *
- ctnetlink_create_conntrack(struct net *net,
- const struct nf_conntrack_zone *zone,
- const struct nlattr * const cda[],
- struct nf_conntrack_tuple *otuple,
- struct nf_conntrack_tuple *rtuple,
- u8 u3)
- {
- struct nf_conn *ct;
- int err = -EINVAL;
- struct nf_conntrack_helper *helper;
- struct nf_conn_tstamp *tstamp;
- u64 timeout;
- ct = nf_conntrack_alloc(net, zone, otuple, rtuple, GFP_ATOMIC);
- if (IS_ERR(ct))
- return ERR_PTR(-ENOMEM);
- if (!cda[CTA_TIMEOUT])
- goto err1;
- timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ;
- if (timeout > INT_MAX)
- timeout = INT_MAX;
- ct->timeout = (u32)timeout + nfct_time_stamp;
- rcu_read_lock();
- if (cda[CTA_HELP]) {
- char *helpname = NULL;
- struct nlattr *helpinfo = NULL;
- err = ctnetlink_parse_help(cda[CTA_HELP], &helpname, &helpinfo);
- if (err < 0)
- goto err2;
- helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper == NULL) {
- rcu_read_unlock();
- #ifdef CONFIG_MODULES
- if (request_module("nfct-helper-%s", helpname) < 0) {
- err = -EOPNOTSUPP;
- goto err1;
- }
- rcu_read_lock();
- helper = __nf_conntrack_helper_find(helpname,
- nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper) {
- err = -EAGAIN;
- goto err2;
- }
- rcu_read_unlock();
- #endif
- err = -EOPNOTSUPP;
- goto err1;
- } else {
- struct nf_conn_help *help;
- help = nf_ct_helper_ext_add(ct, GFP_ATOMIC);
- if (help == NULL) {
- err = -ENOMEM;
- goto err2;
- }
- /* set private helper data if allowed. */
- if (helper->from_nlattr)
- helper->from_nlattr(helpinfo, ct);
- /* disable helper auto-assignment for this entry */
- ct->status |= IPS_HELPER;
- RCU_INIT_POINTER(help->helper, helper);
- }
- } else {
- /* try an implicit helper assignation */
- err = __nf_ct_try_assign_helper(ct, NULL, GFP_ATOMIC);
- if (err < 0)
- goto err2;
- }
- err = ctnetlink_setup_nat(ct, cda);
- if (err < 0)
- goto err2;
- nf_ct_acct_ext_add(ct, GFP_ATOMIC);
- nf_ct_tstamp_ext_add(ct, GFP_ATOMIC);
- nf_ct_ecache_ext_add(ct, 0, 0, GFP_ATOMIC);
- nf_ct_labels_ext_add(ct);
- nfct_seqadj_ext_add(ct);
- nfct_synproxy_ext_add(ct);
- /* we must add conntrack extensions before confirmation. */
- ct->status |= IPS_CONFIRMED;
- if (cda[CTA_STATUS]) {
- err = ctnetlink_change_status(ct, cda);
- if (err < 0)
- goto err2;
- }
- if (cda[CTA_SEQ_ADJ_ORIG] || cda[CTA_SEQ_ADJ_REPLY]) {
- err = ctnetlink_change_seq_adj(ct, cda);
- if (err < 0)
- goto err2;
- }
- memset(&ct->proto, 0, sizeof(ct->proto));
- if (cda[CTA_PROTOINFO]) {
- err = ctnetlink_change_protoinfo(ct, cda);
- if (err < 0)
- goto err2;
- }
- if (cda[CTA_SYNPROXY]) {
- err = ctnetlink_change_synproxy(ct, cda);
- if (err < 0)
- goto err2;
- }
- #if defined(CONFIG_NF_CONNTRACK_MARK)
- if (cda[CTA_MARK])
- ctnetlink_change_mark(ct, cda);
- #endif
- /* setup master conntrack: this is a confirmed expectation */
- if (cda[CTA_TUPLE_MASTER]) {
- struct nf_conntrack_tuple master;
- struct nf_conntrack_tuple_hash *master_h;
- struct nf_conn *master_ct;
- err = ctnetlink_parse_tuple(cda, &master, CTA_TUPLE_MASTER,
- u3, NULL);
- if (err < 0)
- goto err2;
- master_h = nf_conntrack_find_get(net, zone, &master);
- if (master_h == NULL) {
- err = -ENOENT;
- goto err2;
- }
- master_ct = nf_ct_tuplehash_to_ctrack(master_h);
- __set_bit(IPS_EXPECTED_BIT, &ct->status);
- ct->master = master_ct;
- }
- tstamp = nf_conn_tstamp_find(ct);
- if (tstamp)
- tstamp->start = ktime_get_real_ns();
- err = nf_conntrack_hash_check_insert(ct);
- if (err < 0)
- goto err2;
- rcu_read_unlock();
- return ct;
- err2:
- rcu_read_unlock();
- err1:
- nf_conntrack_free(ct);
- return ERR_PTR(err);
- }
- static int ctnetlink_new_conntrack(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_tuple otuple, rtuple;
- struct nf_conntrack_tuple_hash *h = NULL;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- struct nf_conn *ct;
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_zone zone;
- int err;
- err = ctnetlink_parse_zone(cda[CTA_ZONE], &zone);
- if (err < 0)
- return err;
- if (cda[CTA_TUPLE_ORIG]) {
- err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG,
- u3, &zone);
- if (err < 0)
- return err;
- }
- if (cda[CTA_TUPLE_REPLY]) {
- err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY,
- u3, &zone);
- if (err < 0)
- return err;
- }
- if (cda[CTA_TUPLE_ORIG])
- h = nf_conntrack_find_get(net, &zone, &otuple);
- else if (cda[CTA_TUPLE_REPLY])
- h = nf_conntrack_find_get(net, &zone, &rtuple);
- if (h == NULL) {
- err = -ENOENT;
- if (nlh->nlmsg_flags & NLM_F_CREATE) {
- enum ip_conntrack_events events;
- if (!cda[CTA_TUPLE_ORIG] || !cda[CTA_TUPLE_REPLY])
- return -EINVAL;
- if (otuple.dst.protonum != rtuple.dst.protonum)
- return -EINVAL;
- ct = ctnetlink_create_conntrack(net, &zone, cda, &otuple,
- &rtuple, u3);
- if (IS_ERR(ct))
- return PTR_ERR(ct);
- err = 0;
- if (test_bit(IPS_EXPECTED_BIT, &ct->status))
- events = 1 << IPCT_RELATED;
- else
- events = 1 << IPCT_NEW;
- if (cda[CTA_LABELS] &&
- ctnetlink_attach_labels(ct, cda) == 0)
- events |= (1 << IPCT_LABEL);
- nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
- (1 << IPCT_ASSURED) |
- (1 << IPCT_HELPER) |
- (1 << IPCT_PROTOINFO) |
- (1 << IPCT_SEQADJ) |
- (1 << IPCT_MARK) |
- (1 << IPCT_SYNPROXY) |
- events,
- ct, NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- nf_ct_put(ct);
- }
- return err;
- }
- /* implicit 'else' */
- err = -EEXIST;
- ct = nf_ct_tuplehash_to_ctrack(h);
- if (!(nlh->nlmsg_flags & NLM_F_EXCL)) {
- err = ctnetlink_change_conntrack(ct, cda);
- if (err == 0) {
- nf_conntrack_eventmask_report((1 << IPCT_REPLY) |
- (1 << IPCT_ASSURED) |
- (1 << IPCT_HELPER) |
- (1 << IPCT_LABEL) |
- (1 << IPCT_PROTOINFO) |
- (1 << IPCT_SEQADJ) |
- (1 << IPCT_MARK) |
- (1 << IPCT_SYNPROXY),
- ct, NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- }
- }
- nf_ct_put(ct);
- return err;
- }
- static int
- ctnetlink_ct_stat_cpu_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
- __u16 cpu, const struct ip_conntrack_stat *st)
- {
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
- IPCTNL_MSG_CT_GET_STATS_CPU);
- nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = AF_UNSPEC;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = htons(cpu);
- if (nla_put_be32(skb, CTA_STATS_FOUND, htonl(st->found)) ||
- nla_put_be32(skb, CTA_STATS_INVALID, htonl(st->invalid)) ||
- nla_put_be32(skb, CTA_STATS_INSERT, htonl(st->insert)) ||
- nla_put_be32(skb, CTA_STATS_INSERT_FAILED,
- htonl(st->insert_failed)) ||
- nla_put_be32(skb, CTA_STATS_DROP, htonl(st->drop)) ||
- nla_put_be32(skb, CTA_STATS_EARLY_DROP, htonl(st->early_drop)) ||
- nla_put_be32(skb, CTA_STATS_ERROR, htonl(st->error)) ||
- nla_put_be32(skb, CTA_STATS_SEARCH_RESTART,
- htonl(st->search_restart)) ||
- nla_put_be32(skb, CTA_STATS_CLASH_RESOLVE,
- htonl(st->clash_resolve)))
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- return skb->len;
- nla_put_failure:
- nlmsg_failure:
- nlmsg_cancel(skb, nlh);
- return -1;
- }
- static int
- ctnetlink_ct_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
- {
- int cpu;
- struct net *net = sock_net(skb->sk);
- if (cb->args[0] == nr_cpu_ids)
- return 0;
- for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
- const struct ip_conntrack_stat *st;
- if (!cpu_possible(cpu))
- continue;
- st = per_cpu_ptr(net->ct.stat, cpu);
- if (ctnetlink_ct_stat_cpu_fill_info(skb,
- NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- cpu, st) < 0)
- break;
- }
- cb->args[0] = cpu;
- return skb->len;
- }
- static int ctnetlink_stat_ct_cpu(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct netlink_dump_control c = {
- .dump = ctnetlink_ct_stat_cpu_dump,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- return 0;
- }
- static int
- ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type,
- struct net *net)
- {
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- unsigned int nr_conntracks = atomic_read(&net->ct.count);
- event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS);
- nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = AF_UNSPEC;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- if (nla_put_be32(skb, CTA_STATS_GLOBAL_ENTRIES, htonl(nr_conntracks)))
- goto nla_put_failure;
- if (nla_put_be32(skb, CTA_STATS_GLOBAL_MAX_ENTRIES, htonl(nf_conntrack_max)))
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- return skb->len;
- nla_put_failure:
- nlmsg_failure:
- nlmsg_cancel(skb, nlh);
- return -1;
- }
- static int ctnetlink_stat_ct(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct sk_buff *skb2;
- int err;
- skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (skb2 == NULL)
- return -ENOMEM;
- err = ctnetlink_stat_ct_fill_info(skb2, NETLINK_CB(skb).portid,
- nlh->nlmsg_seq,
- NFNL_MSG_TYPE(nlh->nlmsg_type),
- sock_net(skb->sk));
- if (err <= 0)
- goto free;
- err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (err < 0)
- goto out;
- return 0;
- free:
- kfree_skb(skb2);
- out:
- /* this avoids a loop in nfnetlink. */
- return err == -EAGAIN ? -ENOBUFS : err;
- }
- static const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = {
- [CTA_EXPECT_MASTER] = { .type = NLA_NESTED },
- [CTA_EXPECT_TUPLE] = { .type = NLA_NESTED },
- [CTA_EXPECT_MASK] = { .type = NLA_NESTED },
- [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 },
- [CTA_EXPECT_ID] = { .type = NLA_U32 },
- [CTA_EXPECT_HELP_NAME] = { .type = NLA_NUL_STRING,
- .len = NF_CT_HELPER_NAME_LEN - 1 },
- [CTA_EXPECT_ZONE] = { .type = NLA_U16 },
- [CTA_EXPECT_FLAGS] = { .type = NLA_U32 },
- [CTA_EXPECT_CLASS] = { .type = NLA_U32 },
- [CTA_EXPECT_NAT] = { .type = NLA_NESTED },
- [CTA_EXPECT_FN] = { .type = NLA_NUL_STRING },
- };
- static struct nf_conntrack_expect *
- ctnetlink_alloc_expect(const struct nlattr *const cda[], struct nf_conn *ct,
- struct nf_conntrack_helper *helper,
- struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple *mask);
- #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
- static size_t
- ctnetlink_glue_build_size(const struct nf_conn *ct)
- {
- return 3 * nla_total_size(0) /* CTA_TUPLE_ORIG|REPL|MASTER */
- + 3 * nla_total_size(0) /* CTA_TUPLE_IP */
- + 3 * nla_total_size(0) /* CTA_TUPLE_PROTO */
- + 3 * nla_total_size(sizeof(u_int8_t)) /* CTA_PROTO_NUM */
- + nla_total_size(sizeof(u_int32_t)) /* CTA_ID */
- + nla_total_size(sizeof(u_int32_t)) /* CTA_STATUS */
- + nla_total_size(sizeof(u_int32_t)) /* CTA_TIMEOUT */
- + nla_total_size(0) /* CTA_PROTOINFO */
- + nla_total_size(0) /* CTA_HELP */
- + nla_total_size(NF_CT_HELPER_NAME_LEN) /* CTA_HELP_NAME */
- + ctnetlink_secctx_size(ct)
- #if IS_ENABLED(CONFIG_NF_NAT)
- + 2 * nla_total_size(0) /* CTA_NAT_SEQ_ADJ_ORIG|REPL */
- + 6 * nla_total_size(sizeof(u_int32_t)) /* CTA_NAT_SEQ_OFFSET */
- #endif
- #ifdef CONFIG_NF_CONNTRACK_MARK
- + nla_total_size(sizeof(u_int32_t)) /* CTA_MARK */
- #endif
- #ifdef CONFIG_NF_CONNTRACK_ZONES
- + nla_total_size(sizeof(u_int16_t)) /* CTA_ZONE|CTA_TUPLE_ZONE */
- #endif
- + ctnetlink_proto_size(ct)
- ;
- }
- static struct nf_conn *ctnetlink_glue_get_ct(const struct sk_buff *skb,
- enum ip_conntrack_info *ctinfo)
- {
- return nf_ct_get(skb, ctinfo);
- }
- static int __ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct)
- {
- const struct nf_conntrack_zone *zone;
- struct nlattr *nest_parms;
- zone = nf_ct_zone(ct);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_ORIGINAL)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_ORIG) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, nf_ct_tuple(ct, IP_CT_DIR_REPLY)) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_zone_id(skb, CTA_TUPLE_ZONE, zone,
- NF_CT_ZONE_DIR_REPL) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- if (ctnetlink_dump_zone_id(skb, CTA_ZONE, zone,
- NF_CT_DEFAULT_ZONE_DIR) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_id(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_status(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_timeout(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_protoinfo(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_helpinfo(skb, ct) < 0)
- goto nla_put_failure;
- #ifdef CONFIG_NF_CONNTRACK_SECMARK
- if (ct->secmark && ctnetlink_dump_secctx(skb, ct) < 0)
- goto nla_put_failure;
- #endif
- if (ct->master && ctnetlink_dump_master(skb, ct) < 0)
- goto nla_put_failure;
- if ((ct->status & IPS_SEQ_ADJUST) &&
- ctnetlink_dump_ct_seq_adj(skb, ct) < 0)
- goto nla_put_failure;
- if (ctnetlink_dump_ct_synproxy(skb, ct) < 0)
- goto nla_put_failure;
- #ifdef CONFIG_NF_CONNTRACK_MARK
- if (ct->mark && ctnetlink_dump_mark(skb, ct) < 0)
- goto nla_put_failure;
- #endif
- if (ctnetlink_dump_labels(skb, ct) < 0)
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -ENOSPC;
- }
- static int
- ctnetlink_glue_build(struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo,
- u_int16_t ct_attr, u_int16_t ct_info_attr)
- {
- struct nlattr *nest_parms;
- nest_parms = nla_nest_start(skb, ct_attr);
- if (!nest_parms)
- goto nla_put_failure;
- if (__ctnetlink_glue_build(skb, ct) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- if (nla_put_be32(skb, ct_info_attr, htonl(ctinfo)))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -ENOSPC;
- }
- static int
- ctnetlink_update_status(struct nf_conn *ct, const struct nlattr * const cda[])
- {
- unsigned int status = ntohl(nla_get_be32(cda[CTA_STATUS]));
- unsigned long d = ct->status ^ status;
- if (d & IPS_SEEN_REPLY && !(status & IPS_SEEN_REPLY))
- /* SEEN_REPLY bit can only be set */
- return -EBUSY;
- if (d & IPS_ASSURED && !(status & IPS_ASSURED))
- /* ASSURED bit can only be set */
- return -EBUSY;
- /* This check is less strict than ctnetlink_change_status()
- * because callers often flip IPS_EXPECTED bits when sending
- * an NFQA_CT attribute to the kernel. So ignore the
- * unchangeable bits but do not error out. Also user programs
- * are allowed to clear the bits that they are allowed to change.
- */
- __ctnetlink_change_status(ct, status, ~status);
- return 0;
- }
- static int
- ctnetlink_glue_parse_ct(const struct nlattr *cda[], struct nf_conn *ct)
- {
- int err;
- if (cda[CTA_TIMEOUT]) {
- err = ctnetlink_change_timeout(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_STATUS]) {
- err = ctnetlink_update_status(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_HELP]) {
- err = ctnetlink_change_helper(ct, cda);
- if (err < 0)
- return err;
- }
- if (cda[CTA_LABELS]) {
- err = ctnetlink_attach_labels(ct, cda);
- if (err < 0)
- return err;
- }
- #if defined(CONFIG_NF_CONNTRACK_MARK)
- if (cda[CTA_MARK]) {
- ctnetlink_change_mark(ct, cda);
- }
- #endif
- return 0;
- }
- static int
- ctnetlink_glue_parse(const struct nlattr *attr, struct nf_conn *ct)
- {
- struct nlattr *cda[CTA_MAX+1];
- int ret;
- ret = nla_parse_nested_deprecated(cda, CTA_MAX, attr, ct_nla_policy,
- NULL);
- if (ret < 0)
- return ret;
- return ctnetlink_glue_parse_ct((const struct nlattr **)cda, ct);
- }
- static int ctnetlink_glue_exp_parse(const struct nlattr * const *cda,
- const struct nf_conn *ct,
- struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple *mask)
- {
- int err;
- err = ctnetlink_parse_tuple(cda, tuple, CTA_EXPECT_TUPLE,
- nf_ct_l3num(ct), NULL);
- if (err < 0)
- return err;
- return ctnetlink_parse_tuple(cda, mask, CTA_EXPECT_MASK,
- nf_ct_l3num(ct), NULL);
- }
- static int
- ctnetlink_glue_attach_expect(const struct nlattr *attr, struct nf_conn *ct,
- u32 portid, u32 report)
- {
- struct nlattr *cda[CTA_EXPECT_MAX+1];
- struct nf_conntrack_tuple tuple, mask;
- struct nf_conntrack_helper *helper = NULL;
- struct nf_conntrack_expect *exp;
- int err;
- err = nla_parse_nested_deprecated(cda, CTA_EXPECT_MAX, attr,
- exp_nla_policy, NULL);
- if (err < 0)
- return err;
- err = ctnetlink_glue_exp_parse((const struct nlattr * const *)cda,
- ct, &tuple, &mask);
- if (err < 0)
- return err;
- if (cda[CTA_EXPECT_HELP_NAME]) {
- const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
- helper = __nf_conntrack_helper_find(helpname, nf_ct_l3num(ct),
- nf_ct_protonum(ct));
- if (helper == NULL)
- return -EOPNOTSUPP;
- }
- exp = ctnetlink_alloc_expect((const struct nlattr * const *)cda, ct,
- helper, &tuple, &mask);
- if (IS_ERR(exp))
- return PTR_ERR(exp);
- err = nf_ct_expect_related_report(exp, portid, report, 0);
- nf_ct_expect_put(exp);
- return err;
- }
- static void ctnetlink_glue_seqadj(struct sk_buff *skb, struct nf_conn *ct,
- enum ip_conntrack_info ctinfo, int diff)
- {
- if (!(ct->status & IPS_NAT_MASK))
- return;
- nf_ct_tcp_seqadj_set(skb, ct, ctinfo, diff);
- }
- static struct nfnl_ct_hook ctnetlink_glue_hook = {
- .get_ct = ctnetlink_glue_get_ct,
- .build_size = ctnetlink_glue_build_size,
- .build = ctnetlink_glue_build,
- .parse = ctnetlink_glue_parse,
- .attach_expect = ctnetlink_glue_attach_expect,
- .seq_adjust = ctnetlink_glue_seqadj,
- };
- #endif /* CONFIG_NETFILTER_NETLINK_GLUE_CT */
- /***********************************************************************
- * EXPECT
- ***********************************************************************/
- static int ctnetlink_exp_dump_tuple(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple,
- u32 type)
- {
- struct nlattr *nest_parms;
- nest_parms = nla_nest_start(skb, type);
- if (!nest_parms)
- goto nla_put_failure;
- if (ctnetlink_dump_tuples(skb, tuple) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- return 0;
- nla_put_failure:
- return -1;
- }
- static int ctnetlink_exp_dump_mask(struct sk_buff *skb,
- const struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_tuple_mask *mask)
- {
- const struct nf_conntrack_l4proto *l4proto;
- struct nf_conntrack_tuple m;
- struct nlattr *nest_parms;
- int ret;
- memset(&m, 0xFF, sizeof(m));
- memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3));
- m.src.u.all = mask->src.u.all;
- m.src.l3num = tuple->src.l3num;
- m.dst.protonum = tuple->dst.protonum;
- nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK);
- if (!nest_parms)
- goto nla_put_failure;
- rcu_read_lock();
- ret = ctnetlink_dump_tuples_ip(skb, &m);
- if (ret >= 0) {
- l4proto = nf_ct_l4proto_find(tuple->dst.protonum);
- ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto);
- }
- rcu_read_unlock();
- if (unlikely(ret < 0))
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- return 0;
- nla_put_failure:
- return -1;
- }
- static const union nf_inet_addr any_addr;
- static __be32 nf_expect_get_id(const struct nf_conntrack_expect *exp)
- {
- static __read_mostly siphash_key_t exp_id_seed;
- unsigned long a, b, c, d;
- net_get_random_once(&exp_id_seed, sizeof(exp_id_seed));
- a = (unsigned long)exp;
- b = (unsigned long)exp->helper;
- c = (unsigned long)exp->master;
- d = (unsigned long)siphash(&exp->tuple, sizeof(exp->tuple), &exp_id_seed);
- #ifdef CONFIG_64BIT
- return (__force __be32)siphash_4u64((u64)a, (u64)b, (u64)c, (u64)d, &exp_id_seed);
- #else
- return (__force __be32)siphash_4u32((u32)a, (u32)b, (u32)c, (u32)d, &exp_id_seed);
- #endif
- }
- static int
- ctnetlink_exp_dump_expect(struct sk_buff *skb,
- const struct nf_conntrack_expect *exp)
- {
- struct nf_conn *master = exp->master;
- long timeout = ((long)exp->timeout.expires - (long)jiffies) / HZ;
- struct nf_conn_help *help;
- #if IS_ENABLED(CONFIG_NF_NAT)
- struct nlattr *nest_parms;
- struct nf_conntrack_tuple nat_tuple = {};
- #endif
- struct nf_ct_helper_expectfn *expfn;
- if (timeout < 0)
- timeout = 0;
- if (ctnetlink_exp_dump_tuple(skb, &exp->tuple, CTA_EXPECT_TUPLE) < 0)
- goto nla_put_failure;
- if (ctnetlink_exp_dump_mask(skb, &exp->tuple, &exp->mask) < 0)
- goto nla_put_failure;
- if (ctnetlink_exp_dump_tuple(skb,
- &master->tuplehash[IP_CT_DIR_ORIGINAL].tuple,
- CTA_EXPECT_MASTER) < 0)
- goto nla_put_failure;
- #if IS_ENABLED(CONFIG_NF_NAT)
- if (!nf_inet_addr_cmp(&exp->saved_addr, &any_addr) ||
- exp->saved_proto.all) {
- nest_parms = nla_nest_start(skb, CTA_EXPECT_NAT);
- if (!nest_parms)
- goto nla_put_failure;
- if (nla_put_be32(skb, CTA_EXPECT_NAT_DIR, htonl(exp->dir)))
- goto nla_put_failure;
- nat_tuple.src.l3num = nf_ct_l3num(master);
- nat_tuple.src.u3 = exp->saved_addr;
- nat_tuple.dst.protonum = nf_ct_protonum(master);
- nat_tuple.src.u = exp->saved_proto;
- if (ctnetlink_exp_dump_tuple(skb, &nat_tuple,
- CTA_EXPECT_NAT_TUPLE) < 0)
- goto nla_put_failure;
- nla_nest_end(skb, nest_parms);
- }
- #endif
- if (nla_put_be32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)) ||
- nla_put_be32(skb, CTA_EXPECT_ID, nf_expect_get_id(exp)) ||
- nla_put_be32(skb, CTA_EXPECT_FLAGS, htonl(exp->flags)) ||
- nla_put_be32(skb, CTA_EXPECT_CLASS, htonl(exp->class)))
- goto nla_put_failure;
- help = nfct_help(master);
- if (help) {
- struct nf_conntrack_helper *helper;
- helper = rcu_dereference(help->helper);
- if (helper &&
- nla_put_string(skb, CTA_EXPECT_HELP_NAME, helper->name))
- goto nla_put_failure;
- }
- expfn = nf_ct_helper_expectfn_find_by_symbol(exp->expectfn);
- if (expfn != NULL &&
- nla_put_string(skb, CTA_EXPECT_FN, expfn->name))
- goto nla_put_failure;
- return 0;
- nla_put_failure:
- return -1;
- }
- static int
- ctnetlink_exp_fill_info(struct sk_buff *skb, u32 portid, u32 seq,
- int event, const struct nf_conntrack_expect *exp)
- {
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- unsigned int flags = portid ? NLM_F_MULTI : 0;
- event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, event);
- nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = exp->tuple.src.l3num;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- if (ctnetlink_exp_dump_expect(skb, exp) < 0)
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- return skb->len;
- nlmsg_failure:
- nla_put_failure:
- nlmsg_cancel(skb, nlh);
- return -1;
- }
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- static int
- ctnetlink_expect_event(unsigned int events, struct nf_exp_event *item)
- {
- struct nf_conntrack_expect *exp = item->exp;
- struct net *net = nf_ct_exp_net(exp);
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- struct sk_buff *skb;
- unsigned int type, group;
- int flags = 0;
- if (events & (1 << IPEXP_DESTROY)) {
- type = IPCTNL_MSG_EXP_DELETE;
- group = NFNLGRP_CONNTRACK_EXP_DESTROY;
- } else if (events & (1 << IPEXP_NEW)) {
- type = IPCTNL_MSG_EXP_NEW;
- flags = NLM_F_CREATE|NLM_F_EXCL;
- group = NFNLGRP_CONNTRACK_EXP_NEW;
- } else
- return 0;
- if (!item->report && !nfnetlink_has_listeners(net, group))
- return 0;
- skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
- if (skb == NULL)
- goto errout;
- type = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK_EXP, type);
- nlh = nlmsg_put(skb, item->portid, 0, type, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = exp->tuple.src.l3num;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = 0;
- if (ctnetlink_exp_dump_expect(skb, exp) < 0)
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- nfnetlink_send(skb, net, item->portid, group, item->report, GFP_ATOMIC);
- return 0;
- nla_put_failure:
- nlmsg_cancel(skb, nlh);
- nlmsg_failure:
- kfree_skb(skb);
- errout:
- nfnetlink_set_err(net, 0, 0, -ENOBUFS);
- return 0;
- }
- #endif
- static int ctnetlink_exp_done(struct netlink_callback *cb)
- {
- if (cb->args[1])
- nf_ct_expect_put((struct nf_conntrack_expect *)cb->args[1]);
- return 0;
- }
- static int
- ctnetlink_exp_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
- {
- struct net *net = sock_net(skb->sk);
- struct nf_conntrack_expect *exp, *last;
- struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
- u_int8_t l3proto = nfmsg->nfgen_family;
- rcu_read_lock();
- last = (struct nf_conntrack_expect *)cb->args[1];
- for (; cb->args[0] < nf_ct_expect_hsize; cb->args[0]++) {
- restart:
- hlist_for_each_entry_rcu(exp, &nf_ct_expect_hash[cb->args[0]],
- hnode) {
- if (l3proto && exp->tuple.src.l3num != l3proto)
- continue;
- if (!net_eq(nf_ct_net(exp->master), net))
- continue;
- if (cb->args[1]) {
- if (exp != last)
- continue;
- cb->args[1] = 0;
- }
- if (ctnetlink_exp_fill_info(skb,
- NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- IPCTNL_MSG_EXP_NEW,
- exp) < 0) {
- if (!refcount_inc_not_zero(&exp->use))
- continue;
- cb->args[1] = (unsigned long)exp;
- goto out;
- }
- }
- if (cb->args[1]) {
- cb->args[1] = 0;
- goto restart;
- }
- }
- out:
- rcu_read_unlock();
- if (last)
- nf_ct_expect_put(last);
- return skb->len;
- }
- static int
- ctnetlink_exp_ct_dump_table(struct sk_buff *skb, struct netlink_callback *cb)
- {
- struct nf_conntrack_expect *exp, *last;
- struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh);
- struct nf_conn *ct = cb->data;
- struct nf_conn_help *help = nfct_help(ct);
- u_int8_t l3proto = nfmsg->nfgen_family;
- if (cb->args[0])
- return 0;
- rcu_read_lock();
- last = (struct nf_conntrack_expect *)cb->args[1];
- restart:
- hlist_for_each_entry_rcu(exp, &help->expectations, lnode) {
- if (l3proto && exp->tuple.src.l3num != l3proto)
- continue;
- if (cb->args[1]) {
- if (exp != last)
- continue;
- cb->args[1] = 0;
- }
- if (ctnetlink_exp_fill_info(skb, NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- IPCTNL_MSG_EXP_NEW,
- exp) < 0) {
- if (!refcount_inc_not_zero(&exp->use))
- continue;
- cb->args[1] = (unsigned long)exp;
- goto out;
- }
- }
- if (cb->args[1]) {
- cb->args[1] = 0;
- goto restart;
- }
- cb->args[0] = 1;
- out:
- rcu_read_unlock();
- if (last)
- nf_ct_expect_put(last);
- return skb->len;
- }
- static int ctnetlink_dump_exp_ct(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- int err;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_tuple tuple;
- struct nf_conntrack_tuple_hash *h;
- struct nf_conn *ct;
- struct nf_conntrack_zone zone;
- struct netlink_dump_control c = {
- .dump = ctnetlink_exp_ct_dump_table,
- .done = ctnetlink_exp_done,
- };
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
- u3, NULL);
- if (err < 0)
- return err;
- err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
- if (err < 0)
- return err;
- h = nf_conntrack_find_get(net, &zone, &tuple);
- if (!h)
- return -ENOENT;
- ct = nf_ct_tuplehash_to_ctrack(h);
- /* No expectation linked to this connection tracking. */
- if (!nfct_help(ct)) {
- nf_ct_put(ct);
- return 0;
- }
- c.data = ct;
- err = netlink_dump_start(ctnl, skb, nlh, &c);
- nf_ct_put(ct);
- return err;
- }
- static int ctnetlink_get_expect(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_tuple tuple;
- struct nf_conntrack_expect *exp;
- struct sk_buff *skb2;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_zone zone;
- int err;
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- if (cda[CTA_EXPECT_MASTER])
- return ctnetlink_dump_exp_ct(net, ctnl, skb, nlh, cda,
- extack);
- else {
- struct netlink_dump_control c = {
- .dump = ctnetlink_exp_dump_table,
- .done = ctnetlink_exp_done,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- }
- err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
- if (err < 0)
- return err;
- if (cda[CTA_EXPECT_TUPLE])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
- u3, NULL);
- else if (cda[CTA_EXPECT_MASTER])
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER,
- u3, NULL);
- else
- return -EINVAL;
- if (err < 0)
- return err;
- exp = nf_ct_expect_find_get(net, &zone, &tuple);
- if (!exp)
- return -ENOENT;
- if (cda[CTA_EXPECT_ID]) {
- __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
- if (id != nf_expect_get_id(exp)) {
- nf_ct_expect_put(exp);
- return -ENOENT;
- }
- }
- err = -ENOMEM;
- skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
- if (skb2 == NULL) {
- nf_ct_expect_put(exp);
- goto out;
- }
- rcu_read_lock();
- err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).portid,
- nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, exp);
- rcu_read_unlock();
- nf_ct_expect_put(exp);
- if (err <= 0)
- goto free;
- err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).portid, MSG_DONTWAIT);
- if (err < 0)
- goto out;
- return 0;
- free:
- kfree_skb(skb2);
- out:
- /* this avoids a loop in nfnetlink. */
- return err == -EAGAIN ? -ENOBUFS : err;
- }
- static bool expect_iter_name(struct nf_conntrack_expect *exp, void *data)
- {
- const struct nf_conn_help *m_help;
- const char *name = data;
- m_help = nfct_help(exp->master);
- return strcmp(m_help->helper->name, name) == 0;
- }
- static bool expect_iter_all(struct nf_conntrack_expect *exp, void *data)
- {
- return true;
- }
- static int ctnetlink_del_expect(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_expect *exp;
- struct nf_conntrack_tuple tuple;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_zone zone;
- int err;
- if (cda[CTA_EXPECT_TUPLE]) {
- /* delete a single expect by tuple */
- err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
- u3, NULL);
- if (err < 0)
- return err;
- /* bump usage count to 2 */
- exp = nf_ct_expect_find_get(net, &zone, &tuple);
- if (!exp)
- return -ENOENT;
- if (cda[CTA_EXPECT_ID]) {
- __be32 id = nla_get_be32(cda[CTA_EXPECT_ID]);
- if (ntohl(id) != (u32)(unsigned long)exp) {
- nf_ct_expect_put(exp);
- return -ENOENT;
- }
- }
- /* after list removal, usage count == 1 */
- spin_lock_bh(&nf_conntrack_expect_lock);
- if (del_timer(&exp->timeout)) {
- nf_ct_unlink_expect_report(exp, NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- nf_ct_expect_put(exp);
- }
- spin_unlock_bh(&nf_conntrack_expect_lock);
- /* have to put what we 'get' above.
- * after this line usage count == 0 */
- nf_ct_expect_put(exp);
- } else if (cda[CTA_EXPECT_HELP_NAME]) {
- char *name = nla_data(cda[CTA_EXPECT_HELP_NAME]);
- nf_ct_expect_iterate_net(net, expect_iter_name, name,
- NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- } else {
- /* This basically means we have to flush everything*/
- nf_ct_expect_iterate_net(net, expect_iter_all, NULL,
- NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- }
- return 0;
- }
- static int
- ctnetlink_change_expect(struct nf_conntrack_expect *x,
- const struct nlattr * const cda[])
- {
- if (cda[CTA_EXPECT_TIMEOUT]) {
- if (!del_timer(&x->timeout))
- return -ETIME;
- x->timeout.expires = jiffies +
- ntohl(nla_get_be32(cda[CTA_EXPECT_TIMEOUT])) * HZ;
- add_timer(&x->timeout);
- }
- return 0;
- }
- static const struct nla_policy exp_nat_nla_policy[CTA_EXPECT_NAT_MAX+1] = {
- [CTA_EXPECT_NAT_DIR] = { .type = NLA_U32 },
- [CTA_EXPECT_NAT_TUPLE] = { .type = NLA_NESTED },
- };
- static int
- ctnetlink_parse_expect_nat(const struct nlattr *attr,
- struct nf_conntrack_expect *exp,
- u_int8_t u3)
- {
- #if IS_ENABLED(CONFIG_NF_NAT)
- struct nlattr *tb[CTA_EXPECT_NAT_MAX+1];
- struct nf_conntrack_tuple nat_tuple = {};
- int err;
- err = nla_parse_nested_deprecated(tb, CTA_EXPECT_NAT_MAX, attr,
- exp_nat_nla_policy, NULL);
- if (err < 0)
- return err;
- if (!tb[CTA_EXPECT_NAT_DIR] || !tb[CTA_EXPECT_NAT_TUPLE])
- return -EINVAL;
- err = ctnetlink_parse_tuple((const struct nlattr * const *)tb,
- &nat_tuple, CTA_EXPECT_NAT_TUPLE,
- u3, NULL);
- if (err < 0)
- return err;
- exp->saved_addr = nat_tuple.src.u3;
- exp->saved_proto = nat_tuple.src.u;
- exp->dir = ntohl(nla_get_be32(tb[CTA_EXPECT_NAT_DIR]));
- return 0;
- #else
- return -EOPNOTSUPP;
- #endif
- }
- static struct nf_conntrack_expect *
- ctnetlink_alloc_expect(const struct nlattr * const cda[], struct nf_conn *ct,
- struct nf_conntrack_helper *helper,
- struct nf_conntrack_tuple *tuple,
- struct nf_conntrack_tuple *mask)
- {
- u_int32_t class = 0;
- struct nf_conntrack_expect *exp;
- struct nf_conn_help *help;
- int err;
- help = nfct_help(ct);
- if (!help)
- return ERR_PTR(-EOPNOTSUPP);
- if (cda[CTA_EXPECT_CLASS] && helper) {
- class = ntohl(nla_get_be32(cda[CTA_EXPECT_CLASS]));
- if (class > helper->expect_class_max)
- return ERR_PTR(-EINVAL);
- }
- exp = nf_ct_expect_alloc(ct);
- if (!exp)
- return ERR_PTR(-ENOMEM);
- if (cda[CTA_EXPECT_FLAGS]) {
- exp->flags = ntohl(nla_get_be32(cda[CTA_EXPECT_FLAGS]));
- exp->flags &= ~NF_CT_EXPECT_USERSPACE;
- } else {
- exp->flags = 0;
- }
- if (cda[CTA_EXPECT_FN]) {
- const char *name = nla_data(cda[CTA_EXPECT_FN]);
- struct nf_ct_helper_expectfn *expfn;
- expfn = nf_ct_helper_expectfn_find_by_name(name);
- if (expfn == NULL) {
- err = -EINVAL;
- goto err_out;
- }
- exp->expectfn = expfn->expectfn;
- } else
- exp->expectfn = NULL;
- exp->class = class;
- exp->master = ct;
- exp->helper = helper;
- exp->tuple = *tuple;
- exp->mask.src.u3 = mask->src.u3;
- exp->mask.src.u.all = mask->src.u.all;
- if (cda[CTA_EXPECT_NAT]) {
- err = ctnetlink_parse_expect_nat(cda[CTA_EXPECT_NAT],
- exp, nf_ct_l3num(ct));
- if (err < 0)
- goto err_out;
- }
- return exp;
- err_out:
- nf_ct_expect_put(exp);
- return ERR_PTR(err);
- }
- static int
- ctnetlink_create_expect(struct net *net,
- const struct nf_conntrack_zone *zone,
- const struct nlattr * const cda[],
- u_int8_t u3, u32 portid, int report)
- {
- struct nf_conntrack_tuple tuple, mask, master_tuple;
- struct nf_conntrack_tuple_hash *h = NULL;
- struct nf_conntrack_helper *helper = NULL;
- struct nf_conntrack_expect *exp;
- struct nf_conn *ct;
- int err;
- /* caller guarantees that those three CTA_EXPECT_* exist */
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
- u3, NULL);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK,
- u3, NULL);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER,
- u3, NULL);
- if (err < 0)
- return err;
- /* Look for master conntrack of this expectation */
- h = nf_conntrack_find_get(net, zone, &master_tuple);
- if (!h)
- return -ENOENT;
- ct = nf_ct_tuplehash_to_ctrack(h);
- rcu_read_lock();
- if (cda[CTA_EXPECT_HELP_NAME]) {
- const char *helpname = nla_data(cda[CTA_EXPECT_HELP_NAME]);
- helper = __nf_conntrack_helper_find(helpname, u3,
- nf_ct_protonum(ct));
- if (helper == NULL) {
- rcu_read_unlock();
- #ifdef CONFIG_MODULES
- if (request_module("nfct-helper-%s", helpname) < 0) {
- err = -EOPNOTSUPP;
- goto err_ct;
- }
- rcu_read_lock();
- helper = __nf_conntrack_helper_find(helpname, u3,
- nf_ct_protonum(ct));
- if (helper) {
- err = -EAGAIN;
- goto err_rcu;
- }
- rcu_read_unlock();
- #endif
- err = -EOPNOTSUPP;
- goto err_ct;
- }
- }
- exp = ctnetlink_alloc_expect(cda, ct, helper, &tuple, &mask);
- if (IS_ERR(exp)) {
- err = PTR_ERR(exp);
- goto err_rcu;
- }
- err = nf_ct_expect_related_report(exp, portid, report, 0);
- nf_ct_expect_put(exp);
- err_rcu:
- rcu_read_unlock();
- err_ct:
- nf_ct_put(ct);
- return err;
- }
- static int ctnetlink_new_expect(struct net *net, struct sock *ctnl,
- struct sk_buff *skb, const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- struct nf_conntrack_tuple tuple;
- struct nf_conntrack_expect *exp;
- struct nfgenmsg *nfmsg = nlmsg_data(nlh);
- u_int8_t u3 = nfmsg->nfgen_family;
- struct nf_conntrack_zone zone;
- int err;
- if (!cda[CTA_EXPECT_TUPLE]
- || !cda[CTA_EXPECT_MASK]
- || !cda[CTA_EXPECT_MASTER])
- return -EINVAL;
- err = ctnetlink_parse_zone(cda[CTA_EXPECT_ZONE], &zone);
- if (err < 0)
- return err;
- err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE,
- u3, NULL);
- if (err < 0)
- return err;
- spin_lock_bh(&nf_conntrack_expect_lock);
- exp = __nf_ct_expect_find(net, &zone, &tuple);
- if (!exp) {
- spin_unlock_bh(&nf_conntrack_expect_lock);
- err = -ENOENT;
- if (nlh->nlmsg_flags & NLM_F_CREATE) {
- err = ctnetlink_create_expect(net, &zone, cda, u3,
- NETLINK_CB(skb).portid,
- nlmsg_report(nlh));
- }
- return err;
- }
- err = -EEXIST;
- if (!(nlh->nlmsg_flags & NLM_F_EXCL))
- err = ctnetlink_change_expect(exp, cda);
- spin_unlock_bh(&nf_conntrack_expect_lock);
- return err;
- }
- static int
- ctnetlink_exp_stat_fill_info(struct sk_buff *skb, u32 portid, u32 seq, int cpu,
- const struct ip_conntrack_stat *st)
- {
- struct nlmsghdr *nlh;
- struct nfgenmsg *nfmsg;
- unsigned int flags = portid ? NLM_F_MULTI : 0, event;
- event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK,
- IPCTNL_MSG_EXP_GET_STATS_CPU);
- nlh = nlmsg_put(skb, portid, seq, event, sizeof(*nfmsg), flags);
- if (nlh == NULL)
- goto nlmsg_failure;
- nfmsg = nlmsg_data(nlh);
- nfmsg->nfgen_family = AF_UNSPEC;
- nfmsg->version = NFNETLINK_V0;
- nfmsg->res_id = htons(cpu);
- if (nla_put_be32(skb, CTA_STATS_EXP_NEW, htonl(st->expect_new)) ||
- nla_put_be32(skb, CTA_STATS_EXP_CREATE, htonl(st->expect_create)) ||
- nla_put_be32(skb, CTA_STATS_EXP_DELETE, htonl(st->expect_delete)))
- goto nla_put_failure;
- nlmsg_end(skb, nlh);
- return skb->len;
- nla_put_failure:
- nlmsg_failure:
- nlmsg_cancel(skb, nlh);
- return -1;
- }
- static int
- ctnetlink_exp_stat_cpu_dump(struct sk_buff *skb, struct netlink_callback *cb)
- {
- int cpu;
- struct net *net = sock_net(skb->sk);
- if (cb->args[0] == nr_cpu_ids)
- return 0;
- for (cpu = cb->args[0]; cpu < nr_cpu_ids; cpu++) {
- const struct ip_conntrack_stat *st;
- if (!cpu_possible(cpu))
- continue;
- st = per_cpu_ptr(net->ct.stat, cpu);
- if (ctnetlink_exp_stat_fill_info(skb, NETLINK_CB(cb->skb).portid,
- cb->nlh->nlmsg_seq,
- cpu, st) < 0)
- break;
- }
- cb->args[0] = cpu;
- return skb->len;
- }
- static int ctnetlink_stat_exp_cpu(struct net *net, struct sock *ctnl,
- struct sk_buff *skb,
- const struct nlmsghdr *nlh,
- const struct nlattr * const cda[],
- struct netlink_ext_ack *extack)
- {
- if (nlh->nlmsg_flags & NLM_F_DUMP) {
- struct netlink_dump_control c = {
- .dump = ctnetlink_exp_stat_cpu_dump,
- };
- return netlink_dump_start(ctnl, skb, nlh, &c);
- }
- return 0;
- }
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- static struct nf_ct_event_notifier ctnl_notifier = {
- .fcn = ctnetlink_conntrack_event,
- };
- static struct nf_exp_event_notifier ctnl_notifier_exp = {
- .fcn = ctnetlink_expect_event,
- };
- #endif
- static const struct nfnl_callback ctnl_cb[IPCTNL_MSG_MAX] = {
- [IPCTNL_MSG_CT_NEW] = { .call = ctnetlink_new_conntrack,
- .attr_count = CTA_MAX,
- .policy = ct_nla_policy },
- [IPCTNL_MSG_CT_GET] = { .call = ctnetlink_get_conntrack,
- .attr_count = CTA_MAX,
- .policy = ct_nla_policy },
- [IPCTNL_MSG_CT_DELETE] = { .call = ctnetlink_del_conntrack,
- .attr_count = CTA_MAX,
- .policy = ct_nla_policy },
- [IPCTNL_MSG_CT_GET_CTRZERO] = { .call = ctnetlink_get_conntrack,
- .attr_count = CTA_MAX,
- .policy = ct_nla_policy },
- [IPCTNL_MSG_CT_GET_STATS_CPU] = { .call = ctnetlink_stat_ct_cpu },
- [IPCTNL_MSG_CT_GET_STATS] = { .call = ctnetlink_stat_ct },
- [IPCTNL_MSG_CT_GET_DYING] = { .call = ctnetlink_get_ct_dying },
- [IPCTNL_MSG_CT_GET_UNCONFIRMED] = { .call = ctnetlink_get_ct_unconfirmed },
- };
- static const struct nfnl_callback ctnl_exp_cb[IPCTNL_MSG_EXP_MAX] = {
- [IPCTNL_MSG_EXP_GET] = { .call = ctnetlink_get_expect,
- .attr_count = CTA_EXPECT_MAX,
- .policy = exp_nla_policy },
- [IPCTNL_MSG_EXP_NEW] = { .call = ctnetlink_new_expect,
- .attr_count = CTA_EXPECT_MAX,
- .policy = exp_nla_policy },
- [IPCTNL_MSG_EXP_DELETE] = { .call = ctnetlink_del_expect,
- .attr_count = CTA_EXPECT_MAX,
- .policy = exp_nla_policy },
- [IPCTNL_MSG_EXP_GET_STATS_CPU] = { .call = ctnetlink_stat_exp_cpu },
- };
- static const struct nfnetlink_subsystem ctnl_subsys = {
- .name = "conntrack",
- .subsys_id = NFNL_SUBSYS_CTNETLINK,
- .cb_count = IPCTNL_MSG_MAX,
- .cb = ctnl_cb,
- };
- static const struct nfnetlink_subsystem ctnl_exp_subsys = {
- .name = "conntrack_expect",
- .subsys_id = NFNL_SUBSYS_CTNETLINK_EXP,
- .cb_count = IPCTNL_MSG_EXP_MAX,
- .cb = ctnl_exp_cb,
- };
- MODULE_ALIAS("ip_conntrack_netlink");
- MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK);
- MODULE_ALIAS_NFNL_SUBSYS(NFNL_SUBSYS_CTNETLINK_EXP);
- static int __net_init ctnetlink_net_init(struct net *net)
- {
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- int ret;
- ret = nf_conntrack_register_notifier(net, &ctnl_notifier);
- if (ret < 0) {
- pr_err("ctnetlink_init: cannot register notifier.\n");
- goto err_out;
- }
- ret = nf_ct_expect_register_notifier(net, &ctnl_notifier_exp);
- if (ret < 0) {
- pr_err("ctnetlink_init: cannot expect register notifier.\n");
- goto err_unreg_notifier;
- }
- #endif
- return 0;
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- err_unreg_notifier:
- nf_conntrack_unregister_notifier(net, &ctnl_notifier);
- err_out:
- return ret;
- #endif
- }
- static void ctnetlink_net_exit(struct net *net)
- {
- #ifdef CONFIG_NF_CONNTRACK_EVENTS
- nf_ct_expect_unregister_notifier(net, &ctnl_notifier_exp);
- nf_conntrack_unregister_notifier(net, &ctnl_notifier);
- #endif
- }
- static void __net_exit ctnetlink_net_exit_batch(struct list_head *net_exit_list)
- {
- struct net *net;
- list_for_each_entry(net, net_exit_list, exit_list)
- ctnetlink_net_exit(net);
- /* wait for other cpus until they are done with ctnl_notifiers */
- synchronize_rcu();
- }
- static struct pernet_operations ctnetlink_net_ops = {
- .init = ctnetlink_net_init,
- .exit_batch = ctnetlink_net_exit_batch,
- };
- static int __init ctnetlink_init(void)
- {
- int ret;
- ret = nfnetlink_subsys_register(&ctnl_subsys);
- if (ret < 0) {
- pr_err("ctnetlink_init: cannot register with nfnetlink.\n");
- goto err_out;
- }
- ret = nfnetlink_subsys_register(&ctnl_exp_subsys);
- if (ret < 0) {
- pr_err("ctnetlink_init: cannot register exp with nfnetlink.\n");
- goto err_unreg_subsys;
- }
- ret = register_pernet_subsys(&ctnetlink_net_ops);
- if (ret < 0) {
- pr_err("ctnetlink_init: cannot register pernet operations\n");
- goto err_unreg_exp_subsys;
- }
- #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
- /* setup interaction between nf_queue and nf_conntrack_netlink. */
- RCU_INIT_POINTER(nfnl_ct_hook, &ctnetlink_glue_hook);
- #endif
- return 0;
- err_unreg_exp_subsys:
- nfnetlink_subsys_unregister(&ctnl_exp_subsys);
- err_unreg_subsys:
- nfnetlink_subsys_unregister(&ctnl_subsys);
- err_out:
- return ret;
- }
- static void __exit ctnetlink_exit(void)
- {
- unregister_pernet_subsys(&ctnetlink_net_ops);
- nfnetlink_subsys_unregister(&ctnl_exp_subsys);
- nfnetlink_subsys_unregister(&ctnl_subsys);
- #ifdef CONFIG_NETFILTER_NETLINK_GLUE_CT
- RCU_INIT_POINTER(nfnl_ct_hook, NULL);
- #endif
- synchronize_rcu();
- }
- module_init(ctnetlink_init);
- module_exit(ctnetlink_exit);
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