| /* 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"); |
| MODULE_DESCRIPTION("List and change connection tracking table"); |
| |
| struct ctnetlink_list_dump_ctx { |
| struct nf_conn *last; |
| unsigned int cpu; |
| bool done; |
| }; |
| |
| 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, |
| bool skip_zero) |
| { |
| long timeout; |
| |
| if (nf_ct_is_confirmed(ct)) |
| timeout = nf_ct_expires(ct) / HZ; |
| else |
| timeout = ct->timeout / HZ; |
| |
| if (skip_zero && timeout == 0) |
| return 0; |
| |
| 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, |
| bool destroy) |
| { |
| 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, destroy); |
| |
| 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, |
| bool dump) |
| { |
| u32 mark = READ_ONCE(ct->mark); |
| |
| if (!mark && !dump) |
| return 0; |
| |
| if (nla_put_be32(skb, CTA_MARK, htonl(mark))) |
| goto nla_put_failure; |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| #else |
| #define ctnetlink_dump_mark(a, b, c) (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(refcount_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, true) < 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, false) < 0 || |
| ctnetlink_dump_protoinfo(skb, ct, false) < 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 nlattr *nest_parms; |
| unsigned int event; |
| |
| if (portid) |
| flags |= NLM_F_MULTI; |
| event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_NEW); |
| nlh = nfnl_msg_put(skb, portid, seq, event, flags, nf_ct_l3num(ct), |
| NFNETLINK_V0, 0); |
| if (!nlh) |
| goto nlmsg_failure; |
| |
| 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, const struct nf_ct_event *item) |
| { |
| const struct nf_conntrack_zone *zone; |
| struct net *net; |
| struct nlmsghdr *nlh; |
| 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 = nfnl_msg_put(skb, item->portid, 0, type, flags, nf_ct_l3num(ct), |
| NFNETLINK_V0, 0); |
| if (!nlh) |
| goto nlmsg_failure; |
| |
| 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_timeout(skb, ct, true) < 0) |
| goto nla_put_failure; |
| |
| if (ctnetlink_dump_acct(skb, ct, type) < 0 || |
| ctnetlink_dump_timestamp(skb, ct) < 0 || |
| ctnetlink_dump_protoinfo(skb, ct, true) < 0) |
| goto nla_put_failure; |
| } else { |
| if (ctnetlink_dump_timeout(skb, ct, false) < 0) |
| goto nla_put_failure; |
| |
| if (events & (1 << IPCT_PROTOINFO) && |
| ctnetlink_dump_protoinfo(skb, ct, false) < 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 (ctnetlink_dump_mark(skb, ct, events & (1 << IPCT_MARK))) |
| 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_u32 { |
| u32 val; |
| u32 mask; |
| }; |
| |
| struct ctnetlink_filter { |
| u8 family; |
| bool zone_filter; |
| |
| 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 ctnetlink_filter_u32 mark; |
| struct ctnetlink_filter_u32 status; |
| }; |
| |
| 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 int ctnetlink_filter_parse_mark(struct ctnetlink_filter_u32 *mark, |
| const struct nlattr * const cda[]) |
| { |
| #ifdef CONFIG_NF_CONNTRACK_MARK |
| if (cda[CTA_MARK]) { |
| mark->val = ntohl(nla_get_be32(cda[CTA_MARK])); |
| |
| if (cda[CTA_MARK_MASK]) |
| mark->mask = ntohl(nla_get_be32(cda[CTA_MARK_MASK])); |
| else |
| mark->mask = 0xffffffff; |
| } else if (cda[CTA_MARK_MASK]) { |
| return -EINVAL; |
| } |
| #endif |
| return 0; |
| } |
| |
| static int ctnetlink_filter_parse_status(struct ctnetlink_filter_u32 *status, |
| const struct nlattr * const cda[]) |
| { |
| if (cda[CTA_STATUS]) { |
| status->val = ntohl(nla_get_be32(cda[CTA_STATUS])); |
| if (cda[CTA_STATUS_MASK]) |
| status->mask = ntohl(nla_get_be32(cda[CTA_STATUS_MASK])); |
| else |
| status->mask = status->val; |
| |
| /* status->val == 0? always true, else always false. */ |
| if (status->mask == 0) |
| return -EINVAL; |
| } else if (cda[CTA_STATUS_MASK]) { |
| return -EINVAL; |
| } |
| |
| /* CTA_STATUS is NLA_U32, if this fires UAPI needs to be extended */ |
| BUILD_BUG_ON(__IPS_MAX_BIT >= 32); |
| return 0; |
| } |
| |
| 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; |
| |
| err = ctnetlink_filter_parse_mark(&filter->mark, cda); |
| if (err) |
| goto err_filter; |
| |
| err = ctnetlink_filter_parse_status(&filter->status, cda); |
| if (err) |
| goto err_filter; |
| |
| if (cda[CTA_ZONE]) { |
| err = ctnetlink_parse_zone(cda[CTA_ZONE], &filter->zone); |
| if (err < 0) |
| goto err_filter; |
| filter->zone_filter = true; |
| } |
| |
| if (!cda[CTA_FILTER]) |
| return 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] || cda[CTA_STATUS] || cda[CTA_ZONE]; |
| } |
| |
| 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; |
| u32 status; |
| |
| 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->zone_filter && |
| !nf_ct_zone_equal_any(ct, &filter->zone)) |
| 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 ((READ_ONCE(ct->mark) & filter->mark.mask) != filter->mark.val) |
| goto ignore_entry; |
| #endif |
| status = (u32)READ_ONCE(ct->status); |
| if ((status & filter->status.mask) != filter->status.val) |
| goto ignore_entry; |
| |
| 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) { |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| if (nf_ct_is_expired(ct)) { |
| /* need to defer nf_ct_kill() until lock is released */ |
| if (i < ARRAY_SIZE(nf_ct_evict) && |
| refcount_inc_not_zero(&ct->ct_general.use)) |
| nf_ct_evict[i++] = ct; |
| continue; |
| } |
| |
| if (!net_eq(net, nf_ct_net(ct))) |
| continue; |
| |
| if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| 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, |
| cta_ip_nla_policy, NULL); |
| if (ret < 0) |
| 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 }, |
| [CTA_STATUS_MASK] = { .type = NLA_U32 }, |
| }; |
| |
| static int ctnetlink_flush_iterate(struct nf_conn *ct, void *data) |
| { |
| 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; |
| struct nf_ct_iter_data iter = { |
| .net = net, |
| .portid = portid, |
| .report = report, |
| }; |
| |
| 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); |
| |
| iter.data = filter; |
| } |
| |
| nf_ct_iterate_cleanup_net(ctnetlink_flush_iterate, &iter); |
| kfree(filter); |
| |
| return 0; |
| } |
| |
| static int ctnetlink_del_conntrack(struct sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| u8 family = info->nfmsg->nfgen_family; |
| struct nf_conntrack_tuple_hash *h; |
| struct nf_conntrack_tuple tuple; |
| struct nf_conntrack_zone zone; |
| struct nf_conn *ct; |
| 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, |
| family, &zone); |
| else if (cda[CTA_TUPLE_REPLY]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, |
| family, &zone); |
| else { |
| u_int8_t u3 = info->nfmsg->version ? family : AF_UNSPEC; |
| |
| return ctnetlink_flush_conntrack(info->net, cda, |
| NETLINK_CB(skb).portid, |
| nlmsg_report(info->nlh), u3); |
| } |
| |
| if (err < 0) |
| return err; |
| |
| h = nf_conntrack_find_get(info->net, &zone, &tuple); |
| if (!h) |
| return -ENOENT; |
| |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| |
| 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(info->nlh)); |
| nf_ct_put(ct); |
| |
| return 0; |
| } |
| |
| static int ctnetlink_get_conntrack(struct sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| u_int8_t u3 = info->nfmsg->nfgen_family; |
| struct nf_conntrack_tuple_hash *h; |
| struct nf_conntrack_tuple tuple; |
| struct nf_conntrack_zone zone; |
| struct sk_buff *skb2; |
| struct nf_conn *ct; |
| int err; |
| |
| if (info->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(info->sk, skb, info->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(info->net, &zone, &tuple); |
| if (!h) |
| return -ENOENT; |
| |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| |
| skb2 = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL); |
| if (!skb2) { |
| nf_ct_put(ct); |
| return -ENOMEM; |
| } |
| |
| err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).portid, |
| info->nlh->nlmsg_seq, |
| NFNL_MSG_TYPE(info->nlh->nlmsg_type), ct, |
| true, 0); |
| nf_ct_put(ct); |
| if (err <= 0) { |
| kfree_skb(skb2); |
| return -ENOMEM; |
| } |
| |
| return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); |
| } |
| |
| static int ctnetlink_done_list(struct netlink_callback *cb) |
| { |
| struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
| |
| if (ctx->last) |
| nf_ct_put(ctx->last); |
| |
| return 0; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| static int ctnetlink_dump_one_entry(struct sk_buff *skb, |
| struct netlink_callback *cb, |
| struct nf_conn *ct, |
| bool dying) |
| { |
| struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
| struct nfgenmsg *nfmsg = nlmsg_data(cb->nlh); |
| u8 l3proto = nfmsg->nfgen_family; |
| int res; |
| |
| if (l3proto && nf_ct_l3num(ct) != l3proto) |
| return 0; |
| |
| if (ctx->last) { |
| if (ct != ctx->last) |
| return 0; |
| |
| ctx->last = NULL; |
| } |
| |
| /* 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, 0); |
| if (res < 0) { |
| if (!refcount_inc_not_zero(&ct->ct_general.use)) |
| return 0; |
| |
| ctx->last = ct; |
| } |
| |
| return res; |
| } |
| #endif |
| |
| static int |
| ctnetlink_dump_unconfirmed(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| return 0; |
| } |
| |
| static int |
| ctnetlink_dump_dying(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct ctnetlink_list_dump_ctx *ctx = (void *)cb->ctx; |
| struct nf_conn *last = ctx->last; |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| const struct net *net = sock_net(skb->sk); |
| struct nf_conntrack_net_ecache *ecache_net; |
| struct nf_conntrack_tuple_hash *h; |
| struct hlist_nulls_node *n; |
| #endif |
| |
| if (ctx->done) |
| return 0; |
| |
| ctx->last = NULL; |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| ecache_net = nf_conn_pernet_ecache(net); |
| spin_lock_bh(&ecache_net->dying_lock); |
| |
| hlist_nulls_for_each_entry(h, n, &ecache_net->dying_list, hnnode) { |
| struct nf_conn *ct; |
| int res; |
| |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| if (last && last != ct) |
| continue; |
| |
| res = ctnetlink_dump_one_entry(skb, cb, ct, true); |
| if (res < 0) { |
| spin_unlock_bh(&ecache_net->dying_lock); |
| nf_ct_put(last); |
| return skb->len; |
| } |
| |
| nf_ct_put(last); |
| last = NULL; |
| } |
| |
| spin_unlock_bh(&ecache_net->dying_lock); |
| #endif |
| ctx->done = true; |
| nf_ct_put(last); |
| |
| return skb->len; |
| } |
| |
| static int ctnetlink_get_ct_dying(struct sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = ctnetlink_dump_dying, |
| .done = ctnetlink_done_list, |
| }; |
| return netlink_dump_start(info->sk, skb, info->nlh, &c); |
| } |
| |
| return -EOPNOTSUPP; |
| } |
| |
| static int ctnetlink_get_ct_unconfirmed(struct sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = ctnetlink_dump_unconfirmed, |
| .done = ctnetlink_done_list, |
| }; |
| return netlink_dump_start(info->sk, skb, info->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) |
| { |
| const 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 int |
| ctnetlink_change_status(struct nf_conn *ct, const struct nlattr * const cda[]) |
| { |
| return nf_ct_change_status_common(ct, ntohl(nla_get_be32(cda[CTA_STATUS]))); |
| } |
| |
| 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 (rcu_access_pointer(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[]) |
| { |
| return __nf_ct_change_timeout(ct, (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ); |
| } |
| |
| #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 = (READ_ONCE(ct->mark) & mask) ^ mark; |
| if (newmark != READ_ONCE(ct->mark)) |
| WRITE_ONCE(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; |
| |
| 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); |
| } |
| } |
| |
| 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; |
| |
| timeout = (u64)ntohl(nla_get_be32(cda[CTA_TIMEOUT])) * HZ; |
| __nf_ct_set_timeout(ct, timeout); |
| |
| 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 err3; |
| |
| rcu_read_unlock(); |
| |
| return ct; |
| |
| err3: |
| if (ct->master) |
| nf_ct_put(ct->master); |
| err2: |
| rcu_read_unlock(); |
| err1: |
| nf_conntrack_free(ct); |
| return ERR_PTR(err); |
| } |
| |
| static int ctnetlink_new_conntrack(struct sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| struct nf_conntrack_tuple otuple, rtuple; |
| struct nf_conntrack_tuple_hash *h = NULL; |
| u_int8_t u3 = info->nfmsg->nfgen_family; |
| struct nf_conntrack_zone zone; |
| struct nf_conn *ct; |
| 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(info->net, &zone, &otuple); |
| else if (cda[CTA_TUPLE_REPLY]) |
| h = nf_conntrack_find_get(info->net, &zone, &rtuple); |
| |
| if (h == NULL) { |
| err = -ENOENT; |
| if (info->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(info->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(info->nlh)); |
| nf_ct_put(ct); |
| } |
| |
| return err; |
| } |
| /* implicit 'else' */ |
| |
| err = -EEXIST; |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| if (!(info->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(info->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; |
| unsigned int flags = portid ? NLM_F_MULTI : 0, event; |
| |
| event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, |
| IPCTNL_MSG_CT_GET_STATS_CPU); |
| nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC, |
| NFNETLINK_V0, htons(cpu)); |
| if (!nlh) |
| goto nlmsg_failure; |
| |
| 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)) || |
| nla_put_be32(skb, CTA_STATS_CHAIN_TOOLONG, |
| htonl(st->chaintoolong))) |
| 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 sk_buff *skb, |
| const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| if (info->nlh->nlmsg_flags & NLM_F_DUMP) { |
| struct netlink_dump_control c = { |
| .dump = ctnetlink_ct_stat_cpu_dump, |
| }; |
| return netlink_dump_start(info->sk, skb, info->nlh, &c); |
| } |
| |
| return 0; |
| } |
| |
| static int |
| ctnetlink_stat_ct_fill_info(struct sk_buff *skb, u32 portid, u32 seq, u32 type, |
| struct net *net) |
| { |
| unsigned int flags = portid ? NLM_F_MULTI : 0, event; |
| unsigned int nr_conntracks; |
| struct nlmsghdr *nlh; |
| |
| event = nfnl_msg_type(NFNL_SUBSYS_CTNETLINK, IPCTNL_MSG_CT_GET_STATS); |
| nlh = nfnl_msg_put(skb, portid, seq, event, flags, AF_UNSPEC, |
| NFNETLINK_V0, 0); |
| if (!nlh) |
| goto nlmsg_failure; |
| |
| nr_conntracks = nf_conntrack_count(net); |
| 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 sk_buff *skb, const struct nfnl_info *info, |
| const struct nlattr * const cda[]) |
| { |
| 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, |
| info->nlh->nlmsg_seq, |
| NFNL_MSG_TYPE(info->nlh->nlmsg_type), |
| sock_net(skb->sk)); |
| if (err <= 0) { |
| kfree_skb(skb2); |
| return -ENOMEM; |
| } |
| |
| return nfnetlink_unicast(skb2, info->net, NETLINK_CB(skb).portid); |
| } |
| |
| 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) |
| + ctnetlink_acct_size(ct) |
| + ctnetlink_timestamp_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 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, false) < 0) |
| goto nla_put_failure; |
| |
| if (ctnetlink_dump_protoinfo(skb, ct, false) < 0) |
| goto nla_put_failure; |
| |
| if (ctnetlink_dump_acct(skb, ct, IPCTNL_MSG_CT_GET) < 0 || |
| ctnetlink_dump_timestamp(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 (ctnetlink_dump_mark(skb, ct, true) < 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. |
| */ |
| __nf_ct_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 const struct nfnl_ct_hook ctnetlink_glue_hook = { |
| .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 |