24 #include <sys/types.h> 25 #include <linux/netfilter/nfnetlink_conntrack.h> 27 #include <netlink-private/netlink.h> 28 #include <netlink/attr.h> 29 #include <netlink/netfilter/nfnl.h> 30 #include <netlink/netfilter/ct.h> 31 #include <netlink-private/utils.h> 33 static struct nl_cache_ops nfnl_ct_ops;
36 static struct nla_policy ct_policy[CTA_MAX+1] = {
39 [CTA_STATUS] = { .type =
NLA_U32 },
43 [CTA_TIMEOUT] = { .type =
NLA_U32 },
44 [CTA_MARK] = { .type =
NLA_U32 },
47 [CTA_USE] = { .type =
NLA_U32 },
49 [CTA_ZONE] = { .type =
NLA_U16 },
53 static struct nla_policy ct_tuple_policy[CTA_TUPLE_MAX+1] = {
58 static struct nla_policy ct_ip_policy[CTA_IP_MAX+1] = {
60 [CTA_IP_V4_DST] = { .type =
NLA_U32 },
61 [CTA_IP_V6_SRC] = { .minlen = 16 },
62 [CTA_IP_V6_DST] = { .minlen = 16 },
65 static struct nla_policy ct_proto_policy[CTA_PROTO_MAX+1] = {
67 [CTA_PROTO_SRC_PORT] = { .type =
NLA_U16 },
68 [CTA_PROTO_DST_PORT] = { .type =
NLA_U16 },
69 [CTA_PROTO_ICMP_ID] = { .type =
NLA_U16 },
70 [CTA_PROTO_ICMP_TYPE] = { .type =
NLA_U8 },
71 [CTA_PROTO_ICMP_CODE] = { .type =
NLA_U8 },
72 [CTA_PROTO_ICMPV6_ID] = { .type =
NLA_U16 },
73 [CTA_PROTO_ICMPV6_TYPE] = { .type =
NLA_U8 },
74 [CTA_PROTO_ICMPV6_CODE] = { .type =
NLA_U8 },
77 static struct nla_policy ct_protoinfo_policy[CTA_PROTOINFO_MAX+1] = {
81 static struct nla_policy ct_protoinfo_tcp_policy[CTA_PROTOINFO_TCP_MAX+1] = {
82 [CTA_PROTOINFO_TCP_STATE] = { .
type =
NLA_U8 },
83 [CTA_PROTOINFO_TCP_WSCALE_ORIGINAL] = { .type =
NLA_U8 },
84 [CTA_PROTOINFO_TCP_WSCALE_REPLY] = { .type =
NLA_U8 },
85 [CTA_PROTOINFO_TCP_FLAGS_ORIGINAL] = { .minlen = 2 },
86 [CTA_PROTOINFO_TCP_FLAGS_REPLY] = { .minlen = 2 },
90 static struct nla_policy ct_counters_policy[CTA_COUNTERS_MAX+1] = {
92 [CTA_COUNTERS_BYTES] = { .type =
NLA_U64 },
93 [CTA_COUNTERS32_PACKETS]= { .type =
NLA_U32 },
94 [CTA_COUNTERS32_BYTES] = { .type =
NLA_U32 },
97 static struct nla_policy ct_timestamp_policy[CTA_TIMESTAMP_MAX + 1] = {
99 [CTA_TIMESTAMP_STOP] = { .type =
NLA_U64 },
102 static int ct_parse_ip(
struct nfnl_ct *ct,
int repl,
struct nlattr *attr)
104 struct nlattr *tb[CTA_IP_MAX+1];
105 struct nl_addr *addr;
112 if (tb[CTA_IP_V4_SRC]) {
116 err = nfnl_ct_set_src(ct, repl, addr);
121 if (tb[CTA_IP_V4_DST]) {
125 err = nfnl_ct_set_dst(ct, repl, addr);
130 if (tb[CTA_IP_V6_SRC]) {
134 err = nfnl_ct_set_src(ct, repl, addr);
139 if (tb[CTA_IP_V6_DST]) {
143 err = nfnl_ct_set_dst(ct, repl, addr);
157 static int ct_parse_proto(
struct nfnl_ct *ct,
int repl,
struct nlattr *attr)
159 struct nlattr *tb[CTA_PROTO_MAX+1];
166 if (!repl && tb[CTA_PROTO_NUM])
167 nfnl_ct_set_proto(ct,
nla_get_u8(tb[CTA_PROTO_NUM]));
168 if (tb[CTA_PROTO_SRC_PORT])
169 nfnl_ct_set_src_port(ct, repl,
171 if (tb[CTA_PROTO_DST_PORT])
172 nfnl_ct_set_dst_port(ct, repl,
175 if (ct->ct_family == AF_INET) {
176 if (tb[CTA_PROTO_ICMP_ID])
177 nfnl_ct_set_icmp_id(ct, repl,
179 if (tb[CTA_PROTO_ICMP_TYPE])
180 nfnl_ct_set_icmp_type(ct, repl,
182 if (tb[CTA_PROTO_ICMP_CODE])
183 nfnl_ct_set_icmp_code(ct, repl,
185 }
else if (ct->ct_family == AF_INET6) {
186 if (tb[CTA_PROTO_ICMPV6_ID])
187 nfnl_ct_set_icmp_id(ct, repl,
189 if (tb[CTA_PROTO_ICMPV6_TYPE])
190 nfnl_ct_set_icmp_type(ct, repl,
192 if (tb[CTA_PROTO_ICMPV6_CODE])
193 nfnl_ct_set_icmp_code(ct, repl,
200 static int ct_parse_tuple(
struct nfnl_ct *ct,
int repl,
struct nlattr *attr)
202 struct nlattr *tb[CTA_TUPLE_MAX+1];
209 if (tb[CTA_TUPLE_IP]) {
210 err = ct_parse_ip(ct, repl, tb[CTA_TUPLE_IP]);
215 if (tb[CTA_TUPLE_PROTO]) {
216 err = ct_parse_proto(ct, repl, tb[CTA_TUPLE_PROTO]);
224 static int ct_parse_protoinfo_tcp(
struct nfnl_ct *ct,
struct nlattr *attr)
226 struct nlattr *tb[CTA_PROTOINFO_TCP_MAX+1];
230 ct_protoinfo_tcp_policy);
234 if (tb[CTA_PROTOINFO_TCP_STATE])
235 nfnl_ct_set_tcp_state(ct,
241 static int ct_parse_protoinfo(
struct nfnl_ct *ct,
struct nlattr *attr)
243 struct nlattr *tb[CTA_PROTOINFO_MAX+1];
247 ct_protoinfo_policy);
251 if (tb[CTA_PROTOINFO_TCP]) {
252 err = ct_parse_protoinfo_tcp(ct, tb[CTA_PROTOINFO_TCP]);
260 static int ct_parse_counters(
struct nfnl_ct *ct,
int repl,
struct nlattr *attr)
262 struct nlattr *tb[CTA_COUNTERS_MAX+1];
269 if (tb[CTA_COUNTERS_PACKETS])
270 nfnl_ct_set_packets(ct, repl,
272 if (tb[CTA_COUNTERS32_PACKETS])
273 nfnl_ct_set_packets(ct, repl,
275 if (tb[CTA_COUNTERS_BYTES])
276 nfnl_ct_set_bytes(ct, repl,
278 if (tb[CTA_COUNTERS32_BYTES])
279 nfnl_ct_set_bytes(ct, repl,
285 int nfnlmsg_ct_group(
struct nlmsghdr *nlh)
288 case IPCTNL_MSG_CT_NEW:
289 if (nlh->nlmsg_flags & (NLM_F_CREATE|NLM_F_EXCL))
290 return NFNLGRP_CONNTRACK_NEW;
292 return NFNLGRP_CONNTRACK_UPDATE;
293 case IPCTNL_MSG_CT_DELETE:
294 return NFNLGRP_CONNTRACK_DESTROY;
300 static int ct_parse_timestamp(
struct nfnl_ct *ct,
struct nlattr *attr)
302 struct nlattr *tb[CTA_TIMESTAMP_MAX + 1];
306 ct_timestamp_policy);
310 if (tb[CTA_TIMESTAMP_START] && tb[CTA_TIMESTAMP_STOP])
311 nfnl_ct_set_timestamp(ct,
318 int nfnlmsg_ct_parse(
struct nlmsghdr *nlh,
struct nfnl_ct **result)
321 struct nlattr *tb[CTA_MAX+1];
324 ct = nfnl_ct_alloc();
328 ct->ce_msgtype = nlh->nlmsg_type;
330 err =
nlmsg_parse(nlh,
sizeof(
struct nfgenmsg), tb, CTA_MAX,
337 if (tb[CTA_TUPLE_ORIG]) {
338 err = ct_parse_tuple(ct, 0, tb[CTA_TUPLE_ORIG]);
342 if (tb[CTA_TUPLE_REPLY]) {
343 err = ct_parse_tuple(ct, 1, tb[CTA_TUPLE_REPLY]);
348 if (tb[CTA_PROTOINFO]) {
349 err = ct_parse_protoinfo(ct, tb[CTA_PROTOINFO]);
355 nfnl_ct_set_status(ct, ntohl(
nla_get_u32(tb[CTA_STATUS])));
357 nfnl_ct_set_timeout(ct, ntohl(
nla_get_u32(tb[CTA_TIMEOUT])));
359 nfnl_ct_set_mark(ct, ntohl(
nla_get_u32(tb[CTA_MARK])));
361 nfnl_ct_set_use(ct, ntohl(
nla_get_u32(tb[CTA_USE])));
363 nfnl_ct_set_id(ct, ntohl(
nla_get_u32(tb[CTA_ID])));
365 nfnl_ct_set_zone(ct, ntohs(
nla_get_u16(tb[CTA_ZONE])));
367 if (tb[CTA_COUNTERS_ORIG]) {
368 err = ct_parse_counters(ct, 0, tb[CTA_COUNTERS_ORIG]);
373 if (tb[CTA_COUNTERS_REPLY]) {
374 err = ct_parse_counters(ct, 1, tb[CTA_COUNTERS_REPLY]);
379 if (tb[CTA_TIMESTAMP]) {
380 err = ct_parse_timestamp(ct, tb[CTA_TIMESTAMP]);
393 static int ct_msg_parser(
struct nl_cache_ops *ops,
struct sockaddr_nl *who,
394 struct nlmsghdr *nlh,
struct nl_parser_param *pp)
399 if ((err = nfnlmsg_ct_parse(nlh, &ct)) < 0)
402 err = pp->pp_cb((
struct nl_object *) ct, pp);
417 NLM_F_DUMP, AF_UNSPEC, 0);
420 static int ct_request_update(
struct nl_cache *cache,
struct nl_sock *sk)
425 static int nfnl_ct_build_tuple(
struct nl_msg *msg,
const struct nfnl_ct *ct,
428 struct nlattr *tuple, *ip, *proto;
429 struct nl_addr *addr;
432 family = nfnl_ct_get_family(ct);
434 tuple =
nla_nest_start(msg, repl ? CTA_TUPLE_REPLY : CTA_TUPLE_ORIG);
436 goto nla_put_failure;
440 goto nla_put_failure;
442 addr = nfnl_ct_get_src(ct, repl);
445 family == AF_INET ? CTA_IP_V4_SRC : CTA_IP_V6_SRC,
448 addr = nfnl_ct_get_dst(ct, repl);
451 family == AF_INET ? CTA_IP_V4_DST : CTA_IP_V6_DST,
458 goto nla_put_failure;
460 if (nfnl_ct_test_proto(ct))
461 NLA_PUT_U8(msg, CTA_PROTO_NUM, nfnl_ct_get_proto(ct));
463 if (nfnl_ct_test_src_port(ct, repl))
465 htons(nfnl_ct_get_src_port(ct, repl)));
467 if (nfnl_ct_test_dst_port(ct, repl))
469 htons(nfnl_ct_get_dst_port(ct, repl)));
471 if (family == AF_INET) {
472 if (nfnl_ct_test_icmp_id(ct, repl))
474 htons(nfnl_ct_get_icmp_id(ct, repl)));
476 if (nfnl_ct_test_icmp_type(ct, repl))
478 nfnl_ct_get_icmp_type(ct, repl));
480 if (nfnl_ct_test_icmp_code(ct, repl))
482 nfnl_ct_get_icmp_code(ct, repl));
483 }
else if (family == AF_INET6) {
484 if (nfnl_ct_test_icmp_id(ct, repl))
486 htons(nfnl_ct_get_icmp_id(ct, repl)));
488 if (nfnl_ct_test_icmp_type(ct, repl))
490 nfnl_ct_get_icmp_type(ct, repl));
492 if (nfnl_ct_test_icmp_code(ct, repl))
494 nfnl_ct_get_icmp_code(ct, repl));
506 static int nfnl_ct_build_message(
const struct nfnl_ct *ct,
int cmd,
int flags,
507 struct nl_msg **result)
513 nfnl_ct_get_family(ct), 0);
517 if ((err = nfnl_ct_build_tuple(msg, ct, 0)) < 0)
522 if ( nfnl_ct_get_src(ct, 1) && nfnl_ct_get_dst(ct, 1) )
523 if ((err = nfnl_ct_build_tuple(msg, ct, 1)) < 0)
526 if (nfnl_ct_test_status(ct))
527 NLA_PUT_U32(msg, CTA_STATUS, htonl(nfnl_ct_get_status(ct)));
529 if (nfnl_ct_test_timeout(ct))
530 NLA_PUT_U32(msg, CTA_TIMEOUT, htonl(nfnl_ct_get_timeout(ct)));
532 if (nfnl_ct_test_mark(ct))
533 NLA_PUT_U32(msg, CTA_MARK, htonl(nfnl_ct_get_mark(ct)));
535 if (nfnl_ct_test_id(ct))
536 NLA_PUT_U32(msg, CTA_ID, htonl(nfnl_ct_get_id(ct)));
538 if (nfnl_ct_test_zone(ct))
539 NLA_PUT_U16(msg, CTA_ZONE, htons(nfnl_ct_get_zone(ct)));
550 int nfnl_ct_build_add_request(
const struct nfnl_ct *ct,
int flags,
551 struct nl_msg **result)
553 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_NEW, flags, result);
556 int nfnl_ct_add(
struct nl_sock *sk,
const struct nfnl_ct *ct,
int flags)
561 if ((err = nfnl_ct_build_add_request(ct, flags, &msg)) < 0)
569 return wait_for_ack(sk);
572 int nfnl_ct_build_delete_request(
const struct nfnl_ct *ct,
int flags,
573 struct nl_msg **result)
575 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_DELETE, flags, result);
578 int nfnl_ct_del(
struct nl_sock *sk,
const struct nfnl_ct *ct,
int flags)
583 if ((err = nfnl_ct_build_delete_request(ct, flags, &msg)) < 0)
591 return wait_for_ack(sk);
594 int nfnl_ct_build_query_request(
const struct nfnl_ct *ct,
int flags,
595 struct nl_msg **result)
597 return nfnl_ct_build_message(ct, IPCTNL_MSG_CT_GET, flags, result);
600 int nfnl_ct_query(
struct nl_sock *sk,
const struct nfnl_ct *ct,
int flags)
605 if ((err = nfnl_ct_build_query_request(ct, flags, &msg)) < 0)
613 return wait_for_ack(sk);
645 static struct nl_af_group ct_groups[] = {
646 { AF_UNSPEC, NFNLGRP_CONNTRACK_NEW },
647 { AF_UNSPEC, NFNLGRP_CONNTRACK_UPDATE },
648 { AF_UNSPEC, NFNLGRP_CONNTRACK_DESTROY },
649 { END_OF_GROUP_LIST },
652 #define NFNLMSG_CT_TYPE(type) NFNLMSG_TYPE(NFNL_SUBSYS_CTNETLINK, (type)) 653 static struct nl_cache_ops nfnl_ct_ops = {
654 .co_name =
"netfilter/ct",
655 .co_hdrsize = NFNL_HDRLEN,
657 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_NEW), NL_ACT_NEW,
"new" },
658 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_GET), NL_ACT_GET,
"get" },
659 { NFNLMSG_CT_TYPE(IPCTNL_MSG_CT_DELETE), NL_ACT_DEL,
"del" },
660 END_OF_MSGTYPES_LIST,
662 .co_protocol = NETLINK_NETFILTER,
663 .co_groups = ct_groups,
664 .co_request_update = ct_request_update,
665 .co_msg_parser = ct_msg_parser,
666 .co_obj_ops = &ct_obj_ops,
669 static void __init ct_init(
void)
674 static void __exit ct_exit(
void)
int nl_send_auto_complete(struct nl_sock *sk, struct nl_msg *msg)
void nlmsg_free(struct nl_msg *msg)
Release a reference from an netlink message.
int nlmsg_parse(struct nlmsghdr *nlh, int hdrlen, struct nlattr *tb[], int maxtype, const struct nla_policy *policy)
parse attributes of a netlink message
#define NLA_PUT_ADDR(msg, attrtype, addr)
Add address attribute to netlink message.
int nfnl_ct_alloc_cache(struct nl_sock *sk, struct nl_cache **result)
Build a conntrack cache holding all conntrack currently in the kernel.
int nl_cache_mngt_unregister(struct nl_cache_ops *ops)
Unregister a set of cache operations.
Attribute validation policy.
uint8_t nla_get_u8(const struct nlattr *nla)
Return value of 8 bit integer attribute.
uint32_t nla_get_u32(const struct nlattr *nla)
Return payload of 32 bit integer attribute.
uint8_t nfnlmsg_subtype(struct nlmsghdr *nlh)
Get netfilter message type from message.
struct nl_addr * nl_addr_alloc_attr(const struct nlattr *nla, int family)
Allocate abstract address based on Netlink attribute.
#define NLA_PUT_U8(msg, attrtype, value)
Add 8 bit integer attribute to netlink message.
int nla_nest_end(struct nl_msg *msg, struct nlattr *start)
Finalize nesting of attributes.
int nfnl_ct_dump_request(struct nl_sock *sk)
Send nfnl ct dump request.
int nl_cache_mngt_register(struct nl_cache_ops *ops)
Register a set of cache operations.
int nla_parse_nested(struct nlattr *tb[], int maxtype, struct nlattr *nla, const struct nla_policy *policy)
Create attribute index based on nested attribute.
int nfnl_send_simple(struct nl_sock *sk, uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)
Send trivial netfilter netlink message.
#define NLA_PUT_U32(msg, attrtype, value)
Add 32 bit integer attribute to netlink message.
uint8_t nfnlmsg_family(struct nlmsghdr *nlh)
Get netfilter family from message.
void nl_addr_put(struct nl_addr *addr)
Decrease the reference counter of an abstract address.
uint16_t type
Type of attribute or NLA_UNSPEC.
uint16_t nla_get_u16(const struct nlattr *nla)
Return payload of 16 bit integer attribute.
#define NLA_PUT_U16(msg, attrtype, value)
Add 16 bit integer attribute to netlink message.
uint64_t nla_get_u64(const struct nlattr *nla)
Return payload of u64 attribute.
struct nl_msg * nfnlmsg_alloc_simple(uint8_t subsys_id, uint8_t type, int flags, uint8_t family, uint16_t res_id)
Allocate a new netfilter netlink message.
int nl_cache_alloc_and_fill(struct nl_cache_ops *ops, struct nl_sock *sock, struct nl_cache **result)
Allocate new cache and fill it.
struct nlattr * nla_nest_start(struct nl_msg *msg, int attrtype)
Start a new level of nested attributes.