| /* 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) 2005-2008 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/types.h> |
| #include <linux/timer.h> |
| #include <linux/skbuff.h> |
| #include <linux/errno.h> |
| #include <linux/netlink.h> |
| #include <linux/spinlock.h> |
| #include <linux/interrupt.h> |
| #include <linux/notifier.h> |
| |
| #include <linux/netfilter.h> |
| #include <net/netlink.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_l3proto.h> |
| #include <net/netfilter/nf_conntrack_l4proto.h> |
| #include <net/netfilter/nf_conntrack_tuple.h> |
| #include <net/netfilter/nf_conntrack_acct.h> |
| #ifdef CONFIG_NF_NAT_NEEDED |
| #include <net/netfilter/nf_nat_core.h> |
| #include <net/netfilter/nf_nat_protocol.h> |
| #endif |
| |
| #include <linux/netfilter/nfnetlink.h> |
| #include <linux/netfilter/nfnetlink_conntrack.h> |
| |
| MODULE_LICENSE("GPL"); |
| |
| static char __initdata version[] = "0.93"; |
| |
| static inline int |
| ctnetlink_dump_tuples_proto(struct sk_buff *skb, |
| const struct nf_conntrack_tuple *tuple, |
| struct nf_conntrack_l4proto *l4proto) |
| { |
| int ret = 0; |
| struct nlattr *nest_parms; |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_PROTO | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| NLA_PUT_U8(skb, CTA_PROTO_NUM, tuple->dst.protonum); |
| |
| 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 inline int |
| ctnetlink_dump_tuples_ip(struct sk_buff *skb, |
| const struct nf_conntrack_tuple *tuple, |
| struct nf_conntrack_l3proto *l3proto) |
| { |
| int ret = 0; |
| struct nlattr *nest_parms; |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_IP | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| |
| if (likely(l3proto->tuple_to_nlattr)) |
| ret = l3proto->tuple_to_nlattr(skb, tuple); |
| |
| 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) |
| { |
| int ret; |
| struct nf_conntrack_l3proto *l3proto; |
| struct nf_conntrack_l4proto *l4proto; |
| |
| l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| ret = ctnetlink_dump_tuples_ip(skb, tuple, l3proto); |
| nf_ct_l3proto_put(l3proto); |
| |
| if (unlikely(ret < 0)) |
| return ret; |
| |
| l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| ret = ctnetlink_dump_tuples_proto(skb, tuple, l4proto); |
| nf_ct_l4proto_put(l4proto); |
| |
| return ret; |
| } |
| |
| static inline int |
| ctnetlink_dump_status(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| NLA_PUT_BE32(skb, CTA_STATUS, htonl(ct->status)); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static inline int |
| ctnetlink_dump_timeout(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| long timeout = (ct->timeout.expires - jiffies) / HZ; |
| |
| if (timeout < 0) |
| timeout = 0; |
| |
| NLA_PUT_BE32(skb, CTA_TIMEOUT, htonl(timeout)); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static inline int |
| ctnetlink_dump_protoinfo(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| struct nf_conntrack_l4proto *l4proto; |
| struct nlattr *nest_proto; |
| int ret; |
| |
| l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
| if (!l4proto->to_nlattr) { |
| nf_ct_l4proto_put(l4proto); |
| return 0; |
| } |
| |
| nest_proto = nla_nest_start(skb, CTA_PROTOINFO | NLA_F_NESTED); |
| if (!nest_proto) |
| goto nla_put_failure; |
| |
| ret = l4proto->to_nlattr(skb, nest_proto, ct); |
| |
| nf_ct_l4proto_put(l4proto); |
| |
| nla_nest_end(skb, nest_proto); |
| |
| return ret; |
| |
| nla_put_failure: |
| nf_ct_l4proto_put(l4proto); |
| return -1; |
| } |
| |
| static inline 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 | NLA_F_NESTED); |
| if (!nest_helper) |
| goto nla_put_failure; |
| NLA_PUT_STRING(skb, CTA_HELP_NAME, helper->name); |
| |
| 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 |
| ctnetlink_dump_counters(struct sk_buff *skb, const struct nf_conn *ct, |
| enum ip_conntrack_dir dir) |
| { |
| enum ctattr_type type = dir ? CTA_COUNTERS_REPLY: CTA_COUNTERS_ORIG; |
| struct nlattr *nest_count; |
| const struct nf_conn_counter *acct; |
| |
| acct = nf_conn_acct_find(ct); |
| if (!acct) |
| return 0; |
| |
| nest_count = nla_nest_start(skb, type | NLA_F_NESTED); |
| if (!nest_count) |
| goto nla_put_failure; |
| |
| NLA_PUT_BE64(skb, CTA_COUNTERS_PACKETS, |
| cpu_to_be64(acct[dir].packets)); |
| NLA_PUT_BE64(skb, CTA_COUNTERS_BYTES, |
| cpu_to_be64(acct[dir].bytes)); |
| |
| nla_nest_end(skb, nest_count); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_MARK |
| static inline int |
| ctnetlink_dump_mark(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| NLA_PUT_BE32(skb, CTA_MARK, htonl(ct->mark)); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| #else |
| #define ctnetlink_dump_mark(a, b) (0) |
| #endif |
| |
| #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| static inline int |
| ctnetlink_dump_secmark(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| NLA_PUT_BE32(skb, CTA_SECMARK, htonl(ct->secmark)); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| #else |
| #define ctnetlink_dump_secmark(a, b) (0) |
| #endif |
| |
| #define master_tuple(ct) &(ct->master->tuplehash[IP_CT_DIR_ORIGINAL].tuple) |
| |
| static inline 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 | NLA_F_NESTED); |
| 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; |
| } |
| |
| #ifdef CONFIG_NF_NAT_NEEDED |
| static int |
| dump_nat_seq_adj(struct sk_buff *skb, const struct nf_nat_seq *natseq, int type) |
| { |
| struct nlattr *nest_parms; |
| |
| nest_parms = nla_nest_start(skb, type | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| |
| NLA_PUT_BE32(skb, CTA_NAT_SEQ_CORRECTION_POS, |
| htonl(natseq->correction_pos)); |
| NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_BEFORE, |
| htonl(natseq->offset_before)); |
| NLA_PUT_BE32(skb, CTA_NAT_SEQ_OFFSET_AFTER, |
| htonl(natseq->offset_after)); |
| |
| nla_nest_end(skb, nest_parms); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static inline int |
| ctnetlink_dump_nat_seq_adj(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| struct nf_nat_seq *natseq; |
| struct nf_conn_nat *nat = nfct_nat(ct); |
| |
| if (!(ct->status & IPS_SEQ_ADJUST) || !nat) |
| return 0; |
| |
| natseq = &nat->seq[IP_CT_DIR_ORIGINAL]; |
| if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_ORIG) == -1) |
| return -1; |
| |
| natseq = &nat->seq[IP_CT_DIR_REPLY]; |
| if (dump_nat_seq_adj(skb, natseq, CTA_NAT_SEQ_ADJ_REPLY) == -1) |
| return -1; |
| |
| return 0; |
| } |
| #else |
| #define ctnetlink_dump_nat_seq_adj(a, b) (0) |
| #endif |
| |
| static inline int |
| ctnetlink_dump_id(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| NLA_PUT_BE32(skb, CTA_ID, htonl((unsigned long)ct)); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static inline int |
| ctnetlink_dump_use(struct sk_buff *skb, const struct nf_conn *ct) |
| { |
| NLA_PUT_BE32(skb, CTA_USE, htonl(atomic_read(&ct->ct_general.use))); |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| #define tuple(ct, dir) (&(ct)->tuplehash[dir].tuple) |
| |
| static int |
| ctnetlink_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| int event, int nowait, |
| const struct nf_conn *ct) |
| { |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfmsg; |
| struct nlattr *nest_parms; |
| unsigned char *b = skb_tail_pointer(skb); |
| |
| event |= NFNL_SUBSYS_CTNETLINK << 8; |
| nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| nfmsg = NLMSG_DATA(nlh); |
| |
| nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| nfmsg->nfgen_family = nf_ct_l3num(ct); |
| nfmsg->version = NFNETLINK_V0; |
| nfmsg->res_id = 0; |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| goto nla_put_failure; |
| nla_nest_end(skb, nest_parms); |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| goto nla_put_failure; |
| nla_nest_end(skb, nest_parms); |
| |
| if (ctnetlink_dump_status(skb, ct) < 0 || |
| ctnetlink_dump_timeout(skb, ct) < 0 || |
| ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0 || |
| ctnetlink_dump_protoinfo(skb, ct) < 0 || |
| ctnetlink_dump_helpinfo(skb, ct) < 0 || |
| ctnetlink_dump_mark(skb, ct) < 0 || |
| ctnetlink_dump_secmark(skb, ct) < 0 || |
| ctnetlink_dump_id(skb, ct) < 0 || |
| ctnetlink_dump_use(skb, ct) < 0 || |
| ctnetlink_dump_master(skb, ct) < 0 || |
| ctnetlink_dump_nat_seq_adj(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| return skb->len; |
| |
| nlmsg_failure: |
| nla_put_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| static int ctnetlink_conntrack_event(struct notifier_block *this, |
| unsigned long events, void *ptr) |
| { |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfmsg; |
| struct nlattr *nest_parms; |
| struct nf_conn *ct = (struct nf_conn *)ptr; |
| struct sk_buff *skb; |
| unsigned int type; |
| sk_buff_data_t b; |
| unsigned int flags = 0, group; |
| |
| /* ignore our fake conntrack entry */ |
| if (ct == &nf_conntrack_untracked) |
| return NOTIFY_DONE; |
| |
| if (events & IPCT_DESTROY) { |
| type = IPCTNL_MSG_CT_DELETE; |
| group = NFNLGRP_CONNTRACK_DESTROY; |
| } else if (events & (IPCT_NEW | IPCT_RELATED)) { |
| type = IPCTNL_MSG_CT_NEW; |
| flags = NLM_F_CREATE|NLM_F_EXCL; |
| group = NFNLGRP_CONNTRACK_NEW; |
| } else if (events & (IPCT_STATUS | IPCT_PROTOINFO)) { |
| type = IPCTNL_MSG_CT_NEW; |
| group = NFNLGRP_CONNTRACK_UPDATE; |
| } else |
| return NOTIFY_DONE; |
| |
| if (!nfnetlink_has_listeners(group)) |
| return NOTIFY_DONE; |
| |
| skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| if (!skb) |
| return NOTIFY_DONE; |
| |
| b = skb->tail; |
| |
| type |= NFNL_SUBSYS_CTNETLINK << 8; |
| nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| nfmsg = NLMSG_DATA(nlh); |
| |
| nlh->nlmsg_flags = flags; |
| nfmsg->nfgen_family = nf_ct_l3num(ct); |
| nfmsg->version = NFNETLINK_V0; |
| nfmsg->res_id = 0; |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_ORIG | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_ORIGINAL)) < 0) |
| goto nla_put_failure; |
| nla_nest_end(skb, nest_parms); |
| |
| nest_parms = nla_nest_start(skb, CTA_TUPLE_REPLY | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| if (ctnetlink_dump_tuples(skb, tuple(ct, IP_CT_DIR_REPLY)) < 0) |
| goto nla_put_failure; |
| nla_nest_end(skb, nest_parms); |
| |
| if (ctnetlink_dump_id(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| if (ctnetlink_dump_status(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| if (events & IPCT_DESTROY) { |
| if (ctnetlink_dump_counters(skb, ct, IP_CT_DIR_ORIGINAL) < 0 || |
| ctnetlink_dump_counters(skb, ct, IP_CT_DIR_REPLY) < 0) |
| goto nla_put_failure; |
| } else { |
| if (ctnetlink_dump_timeout(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| if (events & IPCT_PROTOINFO |
| && ctnetlink_dump_protoinfo(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| if ((events & IPCT_HELPER || nfct_help(ct)) |
| && ctnetlink_dump_helpinfo(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| #ifdef CONFIG_NF_CONNTRACK_SECMARK |
| if ((events & IPCT_SECMARK || ct->secmark) |
| && ctnetlink_dump_secmark(skb, ct) < 0) |
| goto nla_put_failure; |
| #endif |
| |
| if (events & IPCT_RELATED && |
| ctnetlink_dump_master(skb, ct) < 0) |
| goto nla_put_failure; |
| |
| if (events & IPCT_NATSEQADJ && |
| ctnetlink_dump_nat_seq_adj(skb, ct) < 0) |
| goto nla_put_failure; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_MARK |
| if ((events & IPCT_MARK || ct->mark) |
| && ctnetlink_dump_mark(skb, ct) < 0) |
| goto nla_put_failure; |
| #endif |
| |
| nlh->nlmsg_len = skb->tail - b; |
| nfnetlink_send(skb, 0, group, 0); |
| return NOTIFY_DONE; |
| |
| nlmsg_failure: |
| nla_put_failure: |
| kfree_skb(skb); |
| return NOTIFY_DONE; |
| } |
| #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]); |
| return 0; |
| } |
| |
| static int |
| ctnetlink_dump_table(struct sk_buff *skb, struct netlink_callback *cb) |
| { |
| struct nf_conn *ct, *last; |
| struct nf_conntrack_tuple_hash *h; |
| struct hlist_node *n; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| u_int8_t l3proto = nfmsg->nfgen_family; |
| |
| rcu_read_lock(); |
| last = (struct nf_conn *)cb->args[1]; |
| for (; cb->args[0] < nf_conntrack_htable_size; cb->args[0]++) { |
| restart: |
| hlist_for_each_entry_rcu(h, n, &init_net.ct.hash[cb->args[0]], |
| hnode) { |
| if (NF_CT_DIRECTION(h) != IP_CT_DIR_ORIGINAL) |
| continue; |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| /* Dump entries of a given L3 protocol number. |
| * If it is not specified, ie. l3proto == 0, |
| * then dump everything. */ |
| if (l3proto && nf_ct_l3num(ct) != l3proto) |
| continue; |
| if (cb->args[1]) { |
| if (ct != last) |
| continue; |
| cb->args[1] = 0; |
| } |
| if (ctnetlink_fill_info(skb, NETLINK_CB(cb->skb).pid, |
| cb->nlh->nlmsg_seq, |
| IPCTNL_MSG_CT_NEW, |
| 1, ct) < 0) { |
| if (!atomic_inc_not_zero(&ct->ct_general.use)) |
| continue; |
| cb->args[1] = (unsigned long)ct; |
| goto out; |
| } |
| |
| if (NFNL_MSG_TYPE(cb->nlh->nlmsg_type) == |
| IPCTNL_MSG_CT_GET_CTRZERO) { |
| struct nf_conn_counter *acct; |
| |
| acct = nf_conn_acct_find(ct); |
| if (acct) |
| memset(acct, 0, sizeof(struct nf_conn_counter[IP_CT_DIR_MAX])); |
| } |
| } |
| if (cb->args[1]) { |
| cb->args[1] = 0; |
| goto restart; |
| } |
| } |
| out: |
| rcu_read_unlock(); |
| if (last) |
| nf_ct_put(last); |
| |
| return skb->len; |
| } |
| |
| static inline int |
| ctnetlink_parse_tuple_ip(struct nlattr *attr, struct nf_conntrack_tuple *tuple) |
| { |
| struct nlattr *tb[CTA_IP_MAX+1]; |
| struct nf_conntrack_l3proto *l3proto; |
| int ret = 0; |
| |
| nla_parse_nested(tb, CTA_IP_MAX, attr, NULL); |
| |
| l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| |
| if (likely(l3proto->nlattr_to_tuple)) { |
| ret = nla_validate_nested(attr, CTA_IP_MAX, |
| l3proto->nla_policy); |
| if (ret == 0) |
| ret = l3proto->nlattr_to_tuple(tb, tuple); |
| } |
| |
| nf_ct_l3proto_put(l3proto); |
| |
| return ret; |
| } |
| |
| static const struct nla_policy proto_nla_policy[CTA_PROTO_MAX+1] = { |
| [CTA_PROTO_NUM] = { .type = NLA_U8 }, |
| }; |
| |
| static inline int |
| ctnetlink_parse_tuple_proto(struct nlattr *attr, |
| struct nf_conntrack_tuple *tuple) |
| { |
| struct nlattr *tb[CTA_PROTO_MAX+1]; |
| struct nf_conntrack_l4proto *l4proto; |
| int ret = 0; |
| |
| ret = nla_parse_nested(tb, CTA_PROTO_MAX, attr, proto_nla_policy); |
| if (ret < 0) |
| return ret; |
| |
| if (!tb[CTA_PROTO_NUM]) |
| return -EINVAL; |
| tuple->dst.protonum = nla_get_u8(tb[CTA_PROTO_NUM]); |
| |
| l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| |
| if (likely(l4proto->nlattr_to_tuple)) { |
| ret = nla_validate_nested(attr, CTA_PROTO_MAX, |
| l4proto->nla_policy); |
| if (ret == 0) |
| ret = l4proto->nlattr_to_tuple(tb, tuple); |
| } |
| |
| nf_ct_l4proto_put(l4proto); |
| |
| return ret; |
| } |
| |
| static int |
| ctnetlink_parse_tuple(struct nlattr *cda[], struct nf_conntrack_tuple *tuple, |
| enum ctattr_tuple type, u_int8_t l3num) |
| { |
| struct nlattr *tb[CTA_TUPLE_MAX+1]; |
| int err; |
| |
| memset(tuple, 0, sizeof(*tuple)); |
| |
| nla_parse_nested(tb, CTA_TUPLE_MAX, cda[type], NULL); |
| |
| if (!tb[CTA_TUPLE_IP]) |
| return -EINVAL; |
| |
| tuple->src.l3num = l3num; |
| |
| err = ctnetlink_parse_tuple_ip(tb[CTA_TUPLE_IP], tuple); |
| if (err < 0) |
| return err; |
| |
| if (!tb[CTA_TUPLE_PROTO]) |
| return -EINVAL; |
| |
| err = ctnetlink_parse_tuple_proto(tb[CTA_TUPLE_PROTO], tuple); |
| 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 inline int |
| ctnetlink_parse_help(struct nlattr *attr, char **helper_name) |
| { |
| struct nlattr *tb[CTA_HELP_MAX+1]; |
| |
| nla_parse_nested(tb, CTA_HELP_MAX, attr, NULL); |
| |
| if (!tb[CTA_HELP_NAME]) |
| return -EINVAL; |
| |
| *helper_name = nla_data(tb[CTA_HELP_NAME]); |
| |
| return 0; |
| } |
| |
| static const struct nla_policy ct_nla_policy[CTA_MAX+1] = { |
| [CTA_STATUS] = { .type = NLA_U32 }, |
| [CTA_TIMEOUT] = { .type = NLA_U32 }, |
| [CTA_MARK] = { .type = NLA_U32 }, |
| [CTA_USE] = { .type = NLA_U32 }, |
| [CTA_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static int |
| ctnetlink_del_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| struct nf_conntrack_tuple_hash *h; |
| struct nf_conntrack_tuple tuple; |
| struct nf_conn *ct; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| u_int8_t u3 = nfmsg->nfgen_family; |
| int err = 0; |
| |
| if (cda[CTA_TUPLE_ORIG]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| else if (cda[CTA_TUPLE_REPLY]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| else { |
| /* Flush the whole table */ |
| nf_conntrack_flush(&init_net); |
| return 0; |
| } |
| |
| if (err < 0) |
| return err; |
| |
| h = nf_conntrack_find_get(&init_net, &tuple); |
| if (!h) |
| return -ENOENT; |
| |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| |
| if (cda[CTA_ID]) { |
| u_int32_t id = ntohl(nla_get_be32(cda[CTA_ID])); |
| if (id != (u32)(unsigned long)ct) { |
| nf_ct_put(ct); |
| return -ENOENT; |
| } |
| } |
| |
| nf_ct_kill(ct); |
| nf_ct_put(ct); |
| |
| return 0; |
| } |
| |
| static int |
| ctnetlink_get_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| 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; |
| int err = 0; |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) |
| return netlink_dump_start(ctnl, skb, nlh, ctnetlink_dump_table, |
| ctnetlink_done); |
| |
| if (cda[CTA_TUPLE_ORIG]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_ORIG, u3); |
| else if (cda[CTA_TUPLE_REPLY]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_TUPLE_REPLY, u3); |
| else |
| return -EINVAL; |
| |
| if (err < 0) |
| return err; |
| |
| h = nf_conntrack_find_get(&init_net, &tuple); |
| if (!h) |
| return -ENOENT; |
| |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| |
| err = -ENOMEM; |
| skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb2) { |
| nf_ct_put(ct); |
| return -ENOMEM; |
| } |
| |
| err = ctnetlink_fill_info(skb2, NETLINK_CB(skb).pid, nlh->nlmsg_seq, |
| IPCTNL_MSG_CT_NEW, 1, ct); |
| nf_ct_put(ct); |
| if (err <= 0) |
| goto free; |
| |
| err = netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| if (err < 0) |
| goto out; |
| |
| return 0; |
| |
| free: |
| kfree_skb(skb2); |
| out: |
| return err; |
| } |
| |
| static int |
| ctnetlink_parse_nat_setup(struct nf_conn *ct, |
| enum nf_nat_manip_type manip, |
| struct nlattr *attr) |
| { |
| typeof(nfnetlink_parse_nat_setup_hook) parse_nat_setup; |
| |
| parse_nat_setup = rcu_dereference(nfnetlink_parse_nat_setup_hook); |
| if (!parse_nat_setup) { |
| #ifdef CONFIG_MODULES |
| rcu_read_unlock(); |
| nfnl_unlock(); |
| if (request_module("nf-nat-ipv4") < 0) { |
| nfnl_lock(); |
| rcu_read_lock(); |
| return -EOPNOTSUPP; |
| } |
| nfnl_lock(); |
| rcu_read_lock(); |
| if (nfnetlink_parse_nat_setup_hook) |
| return -EAGAIN; |
| #endif |
| return -EOPNOTSUPP; |
| } |
| |
| return parse_nat_setup(ct, manip, attr); |
| } |
| |
| static int |
| ctnetlink_change_status(struct nf_conn *ct, struct nlattr *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; |
| |
| /* Be careful here, modifying NAT bits can screw up things, |
| * so don't let users modify them directly if they don't pass |
| * nf_nat_range. */ |
| ct->status |= status & ~(IPS_NAT_DONE_MASK | IPS_NAT_MASK); |
| return 0; |
| } |
| |
| static int |
| ctnetlink_change_nat(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| #ifdef CONFIG_NF_NAT_NEEDED |
| int ret; |
| |
| if (cda[CTA_NAT_DST]) { |
| ret = ctnetlink_parse_nat_setup(ct, |
| IP_NAT_MANIP_DST, |
| cda[CTA_NAT_DST]); |
| if (ret < 0) |
| return ret; |
| } |
| if (cda[CTA_NAT_SRC]) { |
| ret = ctnetlink_parse_nat_setup(ct, |
| IP_NAT_MANIP_SRC, |
| cda[CTA_NAT_SRC]); |
| if (ret < 0) |
| return ret; |
| } |
| return 0; |
| #else |
| return -EOPNOTSUPP; |
| #endif |
| } |
| |
| static inline int |
| ctnetlink_change_helper(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| struct nf_conntrack_helper *helper; |
| struct nf_conn_help *help = nfct_help(ct); |
| char *helpname; |
| int err; |
| |
| /* don't change helper of sibling connections */ |
| if (ct->master) |
| return -EBUSY; |
| |
| err = ctnetlink_parse_help(cda[CTA_HELP], &helpname); |
| if (err < 0) |
| return err; |
| |
| if (!strcmp(helpname, "")) { |
| if (help && help->helper) { |
| /* we had a helper before ... */ |
| nf_ct_remove_expectations(ct); |
| rcu_assign_pointer(help->helper, NULL); |
| } |
| |
| return 0; |
| } |
| |
| helper = __nf_conntrack_helper_find_byname(helpname); |
| if (helper == NULL) |
| return -EOPNOTSUPP; |
| |
| if (help) { |
| if (help->helper == helper) |
| return 0; |
| if (help->helper) |
| return -EBUSY; |
| /* need to zero data of old helper */ |
| memset(&help->help, 0, sizeof(help->help)); |
| } else { |
| help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
| if (help == NULL) |
| return -ENOMEM; |
| } |
| |
| rcu_assign_pointer(help->helper, helper); |
| |
| return 0; |
| } |
| |
| static inline int |
| ctnetlink_change_timeout(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| u_int32_t timeout = ntohl(nla_get_be32(cda[CTA_TIMEOUT])); |
| |
| if (!del_timer(&ct->timeout)) |
| return -ETIME; |
| |
| ct->timeout.expires = jiffies + timeout * HZ; |
| add_timer(&ct->timeout); |
| |
| return 0; |
| } |
| |
| static inline int |
| ctnetlink_change_protoinfo(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| struct nlattr *tb[CTA_PROTOINFO_MAX+1], *attr = cda[CTA_PROTOINFO]; |
| struct nf_conntrack_l4proto *l4proto; |
| int err = 0; |
| |
| nla_parse_nested(tb, CTA_PROTOINFO_MAX, attr, NULL); |
| |
| l4proto = nf_ct_l4proto_find_get(nf_ct_l3num(ct), nf_ct_protonum(ct)); |
| if (l4proto->from_nlattr) |
| err = l4proto->from_nlattr(tb, ct); |
| nf_ct_l4proto_put(l4proto); |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_NF_NAT_NEEDED |
| static inline int |
| change_nat_seq_adj(struct nf_nat_seq *natseq, struct nlattr *attr) |
| { |
| struct nlattr *cda[CTA_NAT_SEQ_MAX+1]; |
| |
| nla_parse_nested(cda, CTA_NAT_SEQ_MAX, attr, NULL); |
| |
| if (!cda[CTA_NAT_SEQ_CORRECTION_POS]) |
| return -EINVAL; |
| |
| natseq->correction_pos = |
| ntohl(nla_get_be32(cda[CTA_NAT_SEQ_CORRECTION_POS])); |
| |
| if (!cda[CTA_NAT_SEQ_OFFSET_BEFORE]) |
| return -EINVAL; |
| |
| natseq->offset_before = |
| ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_BEFORE])); |
| |
| if (!cda[CTA_NAT_SEQ_OFFSET_AFTER]) |
| return -EINVAL; |
| |
| natseq->offset_after = |
| ntohl(nla_get_be32(cda[CTA_NAT_SEQ_OFFSET_AFTER])); |
| |
| return 0; |
| } |
| |
| static int |
| ctnetlink_change_nat_seq_adj(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| int ret = 0; |
| struct nf_conn_nat *nat = nfct_nat(ct); |
| |
| if (!nat) |
| return 0; |
| |
| if (cda[CTA_NAT_SEQ_ADJ_ORIG]) { |
| ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_ORIGINAL], |
| cda[CTA_NAT_SEQ_ADJ_ORIG]); |
| if (ret < 0) |
| return ret; |
| |
| ct->status |= IPS_SEQ_ADJUST; |
| } |
| |
| if (cda[CTA_NAT_SEQ_ADJ_REPLY]) { |
| ret = change_nat_seq_adj(&nat->seq[IP_CT_DIR_REPLY], |
| cda[CTA_NAT_SEQ_ADJ_REPLY]); |
| if (ret < 0) |
| return ret; |
| |
| ct->status |= IPS_SEQ_ADJUST; |
| } |
| |
| return 0; |
| } |
| #endif |
| |
| static int |
| ctnetlink_change_conntrack(struct nf_conn *ct, struct nlattr *cda[]) |
| { |
| int err; |
| |
| 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]) |
| ct->mark = ntohl(nla_get_be32(cda[CTA_MARK])); |
| #endif |
| |
| #ifdef CONFIG_NF_NAT_NEEDED |
| if (cda[CTA_NAT_SEQ_ADJ_ORIG] || cda[CTA_NAT_SEQ_ADJ_REPLY]) { |
| err = ctnetlink_change_nat_seq_adj(ct, cda); |
| if (err < 0) |
| return err; |
| } |
| #endif |
| |
| return 0; |
| } |
| |
| static int |
| ctnetlink_create_conntrack(struct nlattr *cda[], |
| struct nf_conntrack_tuple *otuple, |
| struct nf_conntrack_tuple *rtuple, |
| struct nf_conn *master_ct) |
| { |
| struct nf_conn *ct; |
| int err = -EINVAL; |
| struct nf_conn_help *help; |
| struct nf_conntrack_helper *helper; |
| |
| ct = nf_conntrack_alloc(&init_net, otuple, rtuple, GFP_KERNEL); |
| if (ct == NULL || IS_ERR(ct)) |
| return -ENOMEM; |
| |
| if (!cda[CTA_TIMEOUT]) |
| goto err; |
| ct->timeout.expires = ntohl(nla_get_be32(cda[CTA_TIMEOUT])); |
| |
| ct->timeout.expires = jiffies + ct->timeout.expires * HZ; |
| ct->status |= IPS_CONFIRMED; |
| |
| rcu_read_lock(); |
| helper = __nf_ct_helper_find(rtuple); |
| if (helper) { |
| help = nf_ct_helper_ext_add(ct, GFP_ATOMIC); |
| if (help == NULL) { |
| rcu_read_unlock(); |
| err = -ENOMEM; |
| goto err; |
| } |
| /* not in hash table yet so not strictly necessary */ |
| rcu_assign_pointer(help->helper, helper); |
| } |
| |
| if (cda[CTA_STATUS]) { |
| err = ctnetlink_change_status(ct, cda); |
| if (err < 0) { |
| rcu_read_unlock(); |
| goto err; |
| } |
| } |
| |
| if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) { |
| err = ctnetlink_change_nat(ct, cda); |
| if (err < 0) { |
| rcu_read_unlock(); |
| goto err; |
| } |
| } |
| |
| if (cda[CTA_PROTOINFO]) { |
| err = ctnetlink_change_protoinfo(ct, cda); |
| if (err < 0) { |
| rcu_read_unlock(); |
| goto err; |
| } |
| } |
| |
| nf_ct_acct_ext_add(ct, GFP_KERNEL); |
| |
| #if defined(CONFIG_NF_CONNTRACK_MARK) |
| if (cda[CTA_MARK]) |
| ct->mark = ntohl(nla_get_be32(cda[CTA_MARK])); |
| #endif |
| |
| /* setup master conntrack: this is a confirmed expectation */ |
| if (master_ct) { |
| __set_bit(IPS_EXPECTED_BIT, &ct->status); |
| ct->master = master_ct; |
| } |
| |
| add_timer(&ct->timeout); |
| nf_conntrack_hash_insert(ct); |
| rcu_read_unlock(); |
| |
| return 0; |
| |
| err: |
| nf_conntrack_free(ct); |
| return err; |
| } |
| |
| static int |
| ctnetlink_new_conntrack(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| struct nf_conntrack_tuple otuple, rtuple; |
| struct nf_conntrack_tuple_hash *h = NULL; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| u_int8_t u3 = nfmsg->nfgen_family; |
| int err = 0; |
| |
| if (cda[CTA_TUPLE_ORIG]) { |
| err = ctnetlink_parse_tuple(cda, &otuple, CTA_TUPLE_ORIG, u3); |
| if (err < 0) |
| return err; |
| } |
| |
| if (cda[CTA_TUPLE_REPLY]) { |
| err = ctnetlink_parse_tuple(cda, &rtuple, CTA_TUPLE_REPLY, u3); |
| if (err < 0) |
| return err; |
| } |
| |
| spin_lock_bh(&nf_conntrack_lock); |
| if (cda[CTA_TUPLE_ORIG]) |
| h = __nf_conntrack_find(&init_net, &otuple); |
| else if (cda[CTA_TUPLE_REPLY]) |
| h = __nf_conntrack_find(&init_net, &rtuple); |
| |
| if (h == NULL) { |
| struct nf_conntrack_tuple master; |
| struct nf_conntrack_tuple_hash *master_h = NULL; |
| struct nf_conn *master_ct = NULL; |
| |
| if (cda[CTA_TUPLE_MASTER]) { |
| err = ctnetlink_parse_tuple(cda, |
| &master, |
| CTA_TUPLE_MASTER, |
| u3); |
| if (err < 0) |
| goto out_unlock; |
| |
| master_h = __nf_conntrack_find(&init_net, &master); |
| if (master_h == NULL) { |
| err = -ENOENT; |
| goto out_unlock; |
| } |
| master_ct = nf_ct_tuplehash_to_ctrack(master_h); |
| atomic_inc(&master_ct->ct_general.use); |
| } |
| |
| spin_unlock_bh(&nf_conntrack_lock); |
| err = -ENOENT; |
| if (nlh->nlmsg_flags & NLM_F_CREATE) |
| err = ctnetlink_create_conntrack(cda, |
| &otuple, |
| &rtuple, |
| master_ct); |
| if (err < 0 && master_ct) |
| nf_ct_put(master_ct); |
| |
| return err; |
| } |
| /* implicit 'else' */ |
| |
| /* We manipulate the conntrack inside the global conntrack table lock, |
| * so there's no need to increase the refcount */ |
| err = -EEXIST; |
| if (!(nlh->nlmsg_flags & NLM_F_EXCL)) { |
| /* we only allow nat config for new conntracks */ |
| if (cda[CTA_NAT_SRC] || cda[CTA_NAT_DST]) { |
| err = -EOPNOTSUPP; |
| goto out_unlock; |
| } |
| /* can't link an existing conntrack to a master */ |
| if (cda[CTA_TUPLE_MASTER]) { |
| err = -EOPNOTSUPP; |
| goto out_unlock; |
| } |
| err = ctnetlink_change_conntrack(nf_ct_tuplehash_to_ctrack(h), |
| cda); |
| } |
| |
| out_unlock: |
| spin_unlock_bh(&nf_conntrack_lock); |
| return err; |
| } |
| |
| /*********************************************************************** |
| * EXPECT |
| ***********************************************************************/ |
| |
| static inline int |
| ctnetlink_exp_dump_tuple(struct sk_buff *skb, |
| const struct nf_conntrack_tuple *tuple, |
| enum ctattr_expect type) |
| { |
| struct nlattr *nest_parms; |
| |
| nest_parms = nla_nest_start(skb, type | NLA_F_NESTED); |
| 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 inline int |
| ctnetlink_exp_dump_mask(struct sk_buff *skb, |
| const struct nf_conntrack_tuple *tuple, |
| const struct nf_conntrack_tuple_mask *mask) |
| { |
| int ret; |
| struct nf_conntrack_l3proto *l3proto; |
| struct nf_conntrack_l4proto *l4proto; |
| struct nf_conntrack_tuple m; |
| struct nlattr *nest_parms; |
| |
| memset(&m, 0xFF, sizeof(m)); |
| m.src.u.all = mask->src.u.all; |
| memcpy(&m.src.u3, &mask->src.u3, sizeof(m.src.u3)); |
| |
| nest_parms = nla_nest_start(skb, CTA_EXPECT_MASK | NLA_F_NESTED); |
| if (!nest_parms) |
| goto nla_put_failure; |
| |
| l3proto = nf_ct_l3proto_find_get(tuple->src.l3num); |
| ret = ctnetlink_dump_tuples_ip(skb, &m, l3proto); |
| nf_ct_l3proto_put(l3proto); |
| |
| if (unlikely(ret < 0)) |
| goto nla_put_failure; |
| |
| l4proto = nf_ct_l4proto_find_get(tuple->src.l3num, tuple->dst.protonum); |
| ret = ctnetlink_dump_tuples_proto(skb, &m, l4proto); |
| nf_ct_l4proto_put(l4proto); |
| if (unlikely(ret < 0)) |
| goto nla_put_failure; |
| |
| nla_nest_end(skb, nest_parms); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int |
| ctnetlink_exp_dump_expect(struct sk_buff *skb, |
| const struct nf_conntrack_expect *exp) |
| { |
| struct nf_conn *master = exp->master; |
| long timeout = (exp->timeout.expires - jiffies) / HZ; |
| |
| 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; |
| |
| NLA_PUT_BE32(skb, CTA_EXPECT_TIMEOUT, htonl(timeout)); |
| NLA_PUT_BE32(skb, CTA_EXPECT_ID, htonl((unsigned long)exp)); |
| |
| return 0; |
| |
| nla_put_failure: |
| return -1; |
| } |
| |
| static int |
| ctnetlink_exp_fill_info(struct sk_buff *skb, u32 pid, u32 seq, |
| int event, |
| int nowait, |
| const struct nf_conntrack_expect *exp) |
| { |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfmsg; |
| unsigned char *b = skb_tail_pointer(skb); |
| |
| event |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| nlh = NLMSG_PUT(skb, pid, seq, event, sizeof(struct nfgenmsg)); |
| nfmsg = NLMSG_DATA(nlh); |
| |
| nlh->nlmsg_flags = (nowait && pid) ? NLM_F_MULTI : 0; |
| 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; |
| |
| nlh->nlmsg_len = skb_tail_pointer(skb) - b; |
| return skb->len; |
| |
| nlmsg_failure: |
| nla_put_failure: |
| nlmsg_trim(skb, b); |
| return -1; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| static int ctnetlink_expect_event(struct notifier_block *this, |
| unsigned long events, void *ptr) |
| { |
| struct nlmsghdr *nlh; |
| struct nfgenmsg *nfmsg; |
| struct nf_conntrack_expect *exp = (struct nf_conntrack_expect *)ptr; |
| struct sk_buff *skb; |
| unsigned int type; |
| sk_buff_data_t b; |
| int flags = 0; |
| |
| if (events & IPEXP_NEW) { |
| type = IPCTNL_MSG_EXP_NEW; |
| flags = NLM_F_CREATE|NLM_F_EXCL; |
| } else |
| return NOTIFY_DONE; |
| |
| if (!nfnetlink_has_listeners(NFNLGRP_CONNTRACK_EXP_NEW)) |
| return NOTIFY_DONE; |
| |
| skb = alloc_skb(NLMSG_GOODSIZE, GFP_ATOMIC); |
| if (!skb) |
| return NOTIFY_DONE; |
| |
| b = skb->tail; |
| |
| type |= NFNL_SUBSYS_CTNETLINK_EXP << 8; |
| nlh = NLMSG_PUT(skb, 0, 0, type, sizeof(struct nfgenmsg)); |
| nfmsg = NLMSG_DATA(nlh); |
| |
| nlh->nlmsg_flags = flags; |
| 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; |
| |
| nlh->nlmsg_len = skb->tail - b; |
| nfnetlink_send(skb, 0, NFNLGRP_CONNTRACK_EXP_NEW, 0); |
| return NOTIFY_DONE; |
| |
| nlmsg_failure: |
| nla_put_failure: |
| kfree_skb(skb); |
| return NOTIFY_DONE; |
| } |
| #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 = &init_net; |
| struct nf_conntrack_expect *exp, *last; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(cb->nlh); |
| struct hlist_node *n; |
| 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(exp, n, &net->ct.expect_hash[cb->args[0]], |
| hnode) { |
| 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).pid, |
| cb->nlh->nlmsg_seq, |
| IPCTNL_MSG_EXP_NEW, |
| 1, exp) < 0) { |
| if (!atomic_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 const struct nla_policy exp_nla_policy[CTA_EXPECT_MAX+1] = { |
| [CTA_EXPECT_TIMEOUT] = { .type = NLA_U32 }, |
| [CTA_EXPECT_ID] = { .type = NLA_U32 }, |
| }; |
| |
| static int |
| ctnetlink_get_expect(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| 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; |
| int err = 0; |
| |
| if (nlh->nlmsg_flags & NLM_F_DUMP) { |
| return netlink_dump_start(ctnl, skb, nlh, |
| ctnetlink_exp_dump_table, |
| ctnetlink_exp_done); |
| } |
| |
| if (cda[CTA_EXPECT_MASTER]) |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_MASTER, u3); |
| else |
| return -EINVAL; |
| |
| if (err < 0) |
| return err; |
| |
| exp = nf_ct_expect_find_get(&init_net, &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; |
| } |
| } |
| |
| err = -ENOMEM; |
| skb2 = alloc_skb(NLMSG_GOODSIZE, GFP_KERNEL); |
| if (!skb2) |
| goto out; |
| |
| err = ctnetlink_exp_fill_info(skb2, NETLINK_CB(skb).pid, |
| nlh->nlmsg_seq, IPCTNL_MSG_EXP_NEW, |
| 1, exp); |
| if (err <= 0) |
| goto free; |
| |
| nf_ct_expect_put(exp); |
| |
| return netlink_unicast(ctnl, skb2, NETLINK_CB(skb).pid, MSG_DONTWAIT); |
| |
| free: |
| kfree_skb(skb2); |
| out: |
| nf_ct_expect_put(exp); |
| return err; |
| } |
| |
| static int |
| ctnetlink_del_expect(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| struct nf_conntrack_expect *exp; |
| struct nf_conntrack_tuple tuple; |
| struct nf_conntrack_helper *h; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| struct hlist_node *n, *next; |
| u_int8_t u3 = nfmsg->nfgen_family; |
| unsigned int i; |
| int err; |
| |
| if (cda[CTA_EXPECT_TUPLE]) { |
| /* delete a single expect by tuple */ |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| if (err < 0) |
| return err; |
| |
| /* bump usage count to 2 */ |
| exp = nf_ct_expect_find_get(&init_net, &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 */ |
| nf_ct_unexpect_related(exp); |
| /* 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]); |
| struct nf_conn_help *m_help; |
| |
| /* delete all expectations for this helper */ |
| spin_lock_bh(&nf_conntrack_lock); |
| h = __nf_conntrack_helper_find_byname(name); |
| if (!h) { |
| spin_unlock_bh(&nf_conntrack_lock); |
| return -EOPNOTSUPP; |
| } |
| for (i = 0; i < nf_ct_expect_hsize; i++) { |
| hlist_for_each_entry_safe(exp, n, next, |
| &init_net.ct.expect_hash[i], |
| hnode) { |
| m_help = nfct_help(exp->master); |
| if (m_help->helper == h |
| && del_timer(&exp->timeout)) { |
| nf_ct_unlink_expect(exp); |
| nf_ct_expect_put(exp); |
| } |
| } |
| } |
| spin_unlock_bh(&nf_conntrack_lock); |
| } else { |
| /* This basically means we have to flush everything*/ |
| spin_lock_bh(&nf_conntrack_lock); |
| for (i = 0; i < nf_ct_expect_hsize; i++) { |
| hlist_for_each_entry_safe(exp, n, next, |
| &init_net.ct.expect_hash[i], |
| hnode) { |
| if (del_timer(&exp->timeout)) { |
| nf_ct_unlink_expect(exp); |
| nf_ct_expect_put(exp); |
| } |
| } |
| } |
| spin_unlock_bh(&nf_conntrack_lock); |
| } |
| |
| return 0; |
| } |
| static int |
| ctnetlink_change_expect(struct nf_conntrack_expect *x, struct nlattr *cda[]) |
| { |
| return -EOPNOTSUPP; |
| } |
| |
| static int |
| ctnetlink_create_expect(struct nlattr *cda[], u_int8_t u3) |
| { |
| struct nf_conntrack_tuple tuple, mask, master_tuple; |
| struct nf_conntrack_tuple_hash *h = NULL; |
| struct nf_conntrack_expect *exp; |
| struct nf_conn *ct; |
| struct nf_conn_help *help; |
| int err = 0; |
| |
| /* caller guarantees that those three CTA_EXPECT_* exist */ |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| if (err < 0) |
| return err; |
| err = ctnetlink_parse_tuple(cda, &mask, CTA_EXPECT_MASK, u3); |
| if (err < 0) |
| return err; |
| err = ctnetlink_parse_tuple(cda, &master_tuple, CTA_EXPECT_MASTER, u3); |
| if (err < 0) |
| return err; |
| |
| /* Look for master conntrack of this expectation */ |
| h = nf_conntrack_find_get(&init_net, &master_tuple); |
| if (!h) |
| return -ENOENT; |
| ct = nf_ct_tuplehash_to_ctrack(h); |
| help = nfct_help(ct); |
| |
| if (!help || !help->helper) { |
| /* such conntrack hasn't got any helper, abort */ |
| err = -EINVAL; |
| goto out; |
| } |
| |
| exp = nf_ct_expect_alloc(ct); |
| if (!exp) { |
| err = -ENOMEM; |
| goto out; |
| } |
| |
| exp->expectfn = NULL; |
| exp->flags = 0; |
| exp->master = ct; |
| exp->helper = NULL; |
| memcpy(&exp->tuple, &tuple, sizeof(struct nf_conntrack_tuple)); |
| memcpy(&exp->mask.src.u3, &mask.src.u3, sizeof(exp->mask.src.u3)); |
| exp->mask.src.u.all = mask.src.u.all; |
| |
| err = nf_ct_expect_related(exp); |
| nf_ct_expect_put(exp); |
| |
| out: |
| nf_ct_put(nf_ct_tuplehash_to_ctrack(h)); |
| return err; |
| } |
| |
| static int |
| ctnetlink_new_expect(struct sock *ctnl, struct sk_buff *skb, |
| struct nlmsghdr *nlh, struct nlattr *cda[]) |
| { |
| struct nf_conntrack_tuple tuple; |
| struct nf_conntrack_expect *exp; |
| struct nfgenmsg *nfmsg = NLMSG_DATA(nlh); |
| u_int8_t u3 = nfmsg->nfgen_family; |
| int err = 0; |
| |
| if (!cda[CTA_EXPECT_TUPLE] |
| || !cda[CTA_EXPECT_MASK] |
| || !cda[CTA_EXPECT_MASTER]) |
| return -EINVAL; |
| |
| err = ctnetlink_parse_tuple(cda, &tuple, CTA_EXPECT_TUPLE, u3); |
| if (err < 0) |
| return err; |
| |
| spin_lock_bh(&nf_conntrack_lock); |
| exp = __nf_ct_expect_find(&init_net, &tuple); |
| |
| if (!exp) { |
| spin_unlock_bh(&nf_conntrack_lock); |
| err = -ENOENT; |
| if (nlh->nlmsg_flags & NLM_F_CREATE) |
| err = ctnetlink_create_expect(cda, u3); |
| return err; |
| } |
| |
| err = -EEXIST; |
| if (!(nlh->nlmsg_flags & NLM_F_EXCL)) |
| err = ctnetlink_change_expect(exp, cda); |
| spin_unlock_bh(&nf_conntrack_lock); |
| |
| return err; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| static struct notifier_block ctnl_notifier = { |
| .notifier_call = ctnetlink_conntrack_event, |
| }; |
| |
| static struct notifier_block ctnl_notifier_exp = { |
| .notifier_call = 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 }, |
| }; |
| |
| 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 }, |
| }; |
| |
| 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 __init ctnetlink_init(void) |
| { |
| int ret; |
| |
| printk("ctnetlink v%s: registering with nfnetlink.\n", version); |
| ret = nfnetlink_subsys_register(&ctnl_subsys); |
| if (ret < 0) { |
| printk("ctnetlink_init: cannot register with nfnetlink.\n"); |
| goto err_out; |
| } |
| |
| ret = nfnetlink_subsys_register(&ctnl_exp_subsys); |
| if (ret < 0) { |
| printk("ctnetlink_init: cannot register exp with nfnetlink.\n"); |
| goto err_unreg_subsys; |
| } |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| ret = nf_conntrack_register_notifier(&ctnl_notifier); |
| if (ret < 0) { |
| printk("ctnetlink_init: cannot register notifier.\n"); |
| goto err_unreg_exp_subsys; |
| } |
| |
| ret = nf_ct_expect_register_notifier(&ctnl_notifier_exp); |
| if (ret < 0) { |
| printk("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(&ctnl_notifier); |
| err_unreg_exp_subsys: |
| nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| #endif |
| err_unreg_subsys: |
| nfnetlink_subsys_unregister(&ctnl_subsys); |
| err_out: |
| return ret; |
| } |
| |
| static void __exit ctnetlink_exit(void) |
| { |
| printk("ctnetlink: unregistering from nfnetlink.\n"); |
| |
| #ifdef CONFIG_NF_CONNTRACK_EVENTS |
| nf_ct_expect_unregister_notifier(&ctnl_notifier_exp); |
| nf_conntrack_unregister_notifier(&ctnl_notifier); |
| #endif |
| |
| nfnetlink_subsys_unregister(&ctnl_exp_subsys); |
| nfnetlink_subsys_unregister(&ctnl_subsys); |
| return; |
| } |
| |
| module_init(ctnetlink_init); |
| module_exit(ctnetlink_exit); |