1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * inet_diag.c Module for monitoring INET transport protocols sockets.
5 * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
8 #include <linux/kernel.h>
9 #include <linux/module.h>
10 #include <linux/types.h>
11 #include <linux/fcntl.h>
12 #include <linux/random.h>
13 #include <linux/slab.h>
14 #include <linux/cache.h>
15 #include <linux/init.h>
16 #include <linux/time.h>
21 #include <net/inet_common.h>
22 #include <net/inet_connection_sock.h>
23 #include <net/inet_hashtables.h>
24 #include <net/inet_timewait_sock.h>
25 #include <net/inet6_hashtables.h>
26 #include <net/bpf_sk_storage.h>
27 #include <net/netlink.h>
29 #include <linux/inet.h>
30 #include <linux/stddef.h>
32 #include <linux/inet_diag.h>
33 #include <linux/sock_diag.h>
35 static const struct inet_diag_handler __rcu **inet_diag_table;
37 struct inet_diag_entry {
46 #ifdef CONFIG_SOCK_CGROUP_DATA
51 static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
53 const struct inet_diag_handler *handler;
55 if (proto < 0 || proto >= IPPROTO_MAX)
58 if (!READ_ONCE(inet_diag_table[proto]))
59 sock_load_diag_module(AF_INET, proto);
62 handler = rcu_dereference(inet_diag_table[proto]);
63 if (handler && !try_module_get(handler->owner))
70 static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
72 module_put(handler->owner);
75 void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
77 r->idiag_family = sk->sk_family;
79 r->id.idiag_sport = htons(sk->sk_num);
80 r->id.idiag_dport = sk->sk_dport;
81 r->id.idiag_if = sk->sk_bound_dev_if;
82 sock_diag_save_cookie(sk, r->id.idiag_cookie);
84 #if IS_ENABLED(CONFIG_IPV6)
85 if (sk->sk_family == AF_INET6) {
86 *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
87 *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
91 memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
92 memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
94 r->id.idiag_src[0] = sk->sk_rcv_saddr;
95 r->id.idiag_dst[0] = sk->sk_daddr;
98 EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
100 static size_t inet_sk_attr_size(struct sock *sk,
101 const struct inet_diag_req_v2 *req,
104 const struct inet_diag_handler *handler;
108 handler = rcu_dereference(inet_diag_table[req->sdiag_protocol]);
109 DEBUG_NET_WARN_ON_ONCE(!handler);
110 if (handler && handler->idiag_get_aux_size)
111 aux = handler->idiag_get_aux_size(sk, net_admin);
114 return nla_total_size(sizeof(struct tcp_info))
115 + nla_total_size(sizeof(struct inet_diag_msg))
116 + inet_diag_msg_attrs_size()
117 + nla_total_size(sizeof(struct inet_diag_meminfo))
118 + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
119 + nla_total_size(TCP_CA_NAME_MAX)
120 + nla_total_size(sizeof(struct tcpvegas_info))
125 int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
126 struct inet_diag_msg *r, int ext,
127 struct user_namespace *user_ns,
130 const struct inet_sock *inet = inet_sk(sk);
131 struct inet_diag_sockopt inet_sockopt;
133 if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
136 /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
137 * hence this needs to be included regardless of socket family.
139 if (ext & (1 << (INET_DIAG_TOS - 1)))
140 if (nla_put_u8(skb, INET_DIAG_TOS, READ_ONCE(inet->tos)) < 0)
143 #if IS_ENABLED(CONFIG_IPV6)
144 if (r->idiag_family == AF_INET6) {
145 if (ext & (1 << (INET_DIAG_TCLASS - 1)))
146 if (nla_put_u8(skb, INET_DIAG_TCLASS,
147 inet6_sk(sk)->tclass) < 0)
150 if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
151 nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
156 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, READ_ONCE(sk->sk_mark)))
159 if (ext & (1 << (INET_DIAG_CLASS_ID - 1)) ||
160 ext & (1 << (INET_DIAG_TCLASS - 1))) {
163 #ifdef CONFIG_SOCK_CGROUP_DATA
164 classid = sock_cgroup_classid(&sk->sk_cgrp_data);
166 /* Fallback to socket priority if class id isn't set.
167 * Classful qdiscs use it as direct reference to class.
168 * For cgroup2 classid is always zero.
171 classid = READ_ONCE(sk->sk_priority);
173 if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
177 #ifdef CONFIG_SOCK_CGROUP_DATA
178 if (nla_put_u64_64bit(skb, INET_DIAG_CGROUP_ID,
179 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)),
184 r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
185 r->idiag_inode = sock_i_ino(sk);
187 memset(&inet_sockopt, 0, sizeof(inet_sockopt));
188 inet_sockopt.recverr = inet_test_bit(RECVERR, sk);
189 inet_sockopt.is_icsk = inet_test_bit(IS_ICSK, sk);
190 inet_sockopt.freebind = inet_test_bit(FREEBIND, sk);
191 inet_sockopt.hdrincl = inet_test_bit(HDRINCL, sk);
192 inet_sockopt.mc_loop = inet_test_bit(MC_LOOP, sk);
193 inet_sockopt.transparent = inet_test_bit(TRANSPARENT, sk);
194 inet_sockopt.mc_all = inet_test_bit(MC_ALL, sk);
195 inet_sockopt.nodefrag = inet_test_bit(NODEFRAG, sk);
196 inet_sockopt.bind_address_no_port = inet_test_bit(BIND_ADDRESS_NO_PORT, sk);
197 inet_sockopt.recverr_rfc4884 = inet_test_bit(RECVERR_RFC4884, sk);
198 inet_sockopt.defer_connect = inet_test_bit(DEFER_CONNECT, sk);
199 if (nla_put(skb, INET_DIAG_SOCKOPT, sizeof(inet_sockopt),
207 EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
209 static int inet_diag_parse_attrs(const struct nlmsghdr *nlh, int hdrlen,
210 struct nlattr **req_nlas)
215 nlmsg_for_each_attr(nla, nlh, hdrlen, remaining) {
216 int type = nla_type(nla);
218 if (type == INET_DIAG_REQ_PROTOCOL && nla_len(nla) != sizeof(u32))
221 if (type < __INET_DIAG_REQ_MAX)
222 req_nlas[type] = nla;
227 static int inet_diag_get_protocol(const struct inet_diag_req_v2 *req,
228 const struct inet_diag_dump_data *data)
230 if (data->req_nlas[INET_DIAG_REQ_PROTOCOL])
231 return nla_get_u32(data->req_nlas[INET_DIAG_REQ_PROTOCOL]);
232 return req->sdiag_protocol;
235 #define MAX_DUMP_ALLOC_SIZE (KMALLOC_MAX_SIZE - SKB_DATA_ALIGN(sizeof(struct skb_shared_info)))
237 int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
238 struct sk_buff *skb, struct netlink_callback *cb,
239 const struct inet_diag_req_v2 *req,
240 u16 nlmsg_flags, bool net_admin)
242 const struct tcp_congestion_ops *ca_ops;
243 const struct inet_diag_handler *handler;
244 struct inet_diag_dump_data *cb_data;
245 int ext = req->idiag_ext;
246 struct inet_diag_msg *r;
247 struct nlmsghdr *nlh;
253 protocol = inet_diag_get_protocol(req, cb_data);
255 /* inet_diag_lock_handler() made sure inet_diag_table[] is stable. */
256 handler = rcu_dereference_protected(inet_diag_table[protocol], 1);
257 DEBUG_NET_WARN_ON_ONCE(!handler);
261 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
262 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
267 BUG_ON(!sk_fullsock(sk));
269 inet_diag_msg_common_fill(r, sk);
270 r->idiag_state = sk->sk_state;
272 r->idiag_retrans = 0;
273 r->idiag_expires = 0;
275 if (inet_diag_msg_attrs_fill(sk, skb, r, ext,
276 sk_user_ns(NETLINK_CB(cb->skb).sk),
280 if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
281 struct inet_diag_meminfo minfo = {
282 .idiag_rmem = sk_rmem_alloc_get(sk),
283 .idiag_wmem = READ_ONCE(sk->sk_wmem_queued),
284 .idiag_fmem = sk_forward_alloc_get(sk),
285 .idiag_tmem = sk_wmem_alloc_get(sk),
288 if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
292 if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
293 if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
297 * RAW sockets might have user-defined protocols assigned,
298 * so report the one supplied on socket creation.
300 if (sk->sk_type == SOCK_RAW) {
301 if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
306 handler->idiag_get_info(sk, r, NULL);
310 if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
311 icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
312 icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
314 r->idiag_retrans = icsk->icsk_retransmits;
316 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
317 } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
319 r->idiag_retrans = icsk->icsk_probes_out;
321 jiffies_delta_to_msecs(icsk->icsk_timeout - jiffies);
322 } else if (timer_pending(&sk->sk_timer)) {
324 r->idiag_retrans = icsk->icsk_probes_out;
326 jiffies_delta_to_msecs(sk->sk_timer.expires - jiffies);
329 if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
330 attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
331 handler->idiag_info_size,
336 info = nla_data(attr);
339 if (ext & (1 << (INET_DIAG_CONG - 1))) {
343 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
345 err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
351 handler->idiag_get_info(sk, r, info);
353 if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
354 if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
357 if (sk->sk_state < TCP_TIME_WAIT) {
358 union tcp_cc_info info;
363 ca_ops = READ_ONCE(icsk->icsk_ca_ops);
364 if (ca_ops && ca_ops->get_info)
365 sz = ca_ops->get_info(sk, ext, &attr, &info);
367 if (sz && nla_put(skb, attr, sz, &info) < 0)
371 /* Keep it at the end for potential retry with a larger skb,
372 * or else do best-effort fitting, which is only done for the
375 if (cb_data->bpf_stg_diag) {
376 bool first_nlmsg = ((unsigned char *)nlh == skb->data);
377 unsigned int prev_min_dump_alloc;
378 unsigned int total_nla_size = 0;
379 unsigned int msg_len;
382 msg_len = skb_tail_pointer(skb) - (unsigned char *)nlh;
383 err = bpf_sk_storage_diag_put(cb_data->bpf_stg_diag, sk, skb,
384 INET_DIAG_SK_BPF_STORAGES,
390 total_nla_size += msg_len;
391 prev_min_dump_alloc = cb->min_dump_alloc;
392 if (total_nla_size > prev_min_dump_alloc)
393 cb->min_dump_alloc = min_t(u32, total_nla_size,
394 MAX_DUMP_ALLOC_SIZE);
399 if (cb->min_dump_alloc > prev_min_dump_alloc)
400 /* Retry with pskb_expand_head() with
401 * __GFP_DIRECT_RECLAIM
405 WARN_ON_ONCE(total_nla_size <= prev_min_dump_alloc);
407 /* Send what we have for this sk
408 * and move on to the next sk in the following
418 nlmsg_cancel(skb, nlh);
421 EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
423 static int inet_twsk_diag_fill(struct sock *sk,
425 struct netlink_callback *cb,
426 u16 nlmsg_flags, bool net_admin)
428 struct inet_timewait_sock *tw = inet_twsk(sk);
429 struct inet_diag_msg *r;
430 struct nlmsghdr *nlh;
433 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid,
434 cb->nlh->nlmsg_seq, cb->nlh->nlmsg_type,
435 sizeof(*r), nlmsg_flags);
440 BUG_ON(tw->tw_state != TCP_TIME_WAIT);
442 inet_diag_msg_common_fill(r, sk);
443 r->idiag_retrans = 0;
445 r->idiag_state = tw->tw_substate;
447 tmo = tw->tw_timer.expires - jiffies;
448 r->idiag_expires = jiffies_delta_to_msecs(tmo);
454 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
456 nlmsg_cancel(skb, nlh);
464 static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
465 struct netlink_callback *cb,
466 u16 nlmsg_flags, bool net_admin)
468 struct request_sock *reqsk = inet_reqsk(sk);
469 struct inet_diag_msg *r;
470 struct nlmsghdr *nlh;
473 nlh = nlmsg_put(skb, NETLINK_CB(cb->skb).portid, cb->nlh->nlmsg_seq,
474 cb->nlh->nlmsg_type, sizeof(*r), nlmsg_flags);
479 inet_diag_msg_common_fill(r, sk);
480 r->idiag_state = TCP_SYN_RECV;
482 r->idiag_retrans = reqsk->num_retrans;
484 BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
485 offsetof(struct sock, sk_cookie));
487 tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
488 r->idiag_expires = jiffies_delta_to_msecs(tmo);
494 if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
495 inet_rsk(reqsk)->ir_mark)) {
496 nlmsg_cancel(skb, nlh);
504 static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
505 struct netlink_callback *cb,
506 const struct inet_diag_req_v2 *r,
507 u16 nlmsg_flags, bool net_admin)
509 if (sk->sk_state == TCP_TIME_WAIT)
510 return inet_twsk_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
512 if (sk->sk_state == TCP_NEW_SYN_RECV)
513 return inet_req_diag_fill(sk, skb, cb, nlmsg_flags, net_admin);
515 return inet_sk_diag_fill(sk, inet_csk(sk), skb, cb, r, nlmsg_flags,
519 struct sock *inet_diag_find_one_icsk(struct net *net,
520 struct inet_hashinfo *hashinfo,
521 const struct inet_diag_req_v2 *req)
526 if (req->sdiag_family == AF_INET)
527 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
528 req->id.idiag_dport, req->id.idiag_src[0],
529 req->id.idiag_sport, req->id.idiag_if);
530 #if IS_ENABLED(CONFIG_IPV6)
531 else if (req->sdiag_family == AF_INET6) {
532 if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
533 ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
534 sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
535 req->id.idiag_dport, req->id.idiag_src[3],
536 req->id.idiag_sport, req->id.idiag_if);
538 sk = inet6_lookup(net, hashinfo, NULL, 0,
539 (struct in6_addr *)req->id.idiag_dst,
541 (struct in6_addr *)req->id.idiag_src,
548 return ERR_PTR(-EINVAL);
552 return ERR_PTR(-ENOENT);
554 if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
556 return ERR_PTR(-ENOENT);
561 EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
563 int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
564 struct netlink_callback *cb,
565 const struct inet_diag_req_v2 *req)
567 struct sk_buff *in_skb = cb->skb;
568 bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
569 struct net *net = sock_net(in_skb->sk);
574 sk = inet_diag_find_one_icsk(net, hashinfo, req);
578 rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
584 err = sk_diag_fill(sk, rep, cb, req, 0, net_admin);
586 WARN_ON(err == -EMSGSIZE);
590 err = nlmsg_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid);
598 EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
600 static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
601 const struct nlmsghdr *nlh,
603 const struct inet_diag_req_v2 *req)
605 const struct inet_diag_handler *handler;
606 struct inet_diag_dump_data dump_data;
609 memset(&dump_data, 0, sizeof(dump_data));
610 err = inet_diag_parse_attrs(nlh, hdrlen, dump_data.req_nlas);
614 protocol = inet_diag_get_protocol(req, &dump_data);
616 handler = inet_diag_lock_handler(protocol);
620 if (cmd == SOCK_DIAG_BY_FAMILY) {
621 struct netlink_callback cb = {
626 err = handler->dump_one(&cb, req);
627 } else if (cmd == SOCK_DESTROY && handler->destroy) {
628 err = handler->destroy(in_skb, req);
632 inet_diag_unlock_handler(handler);
637 static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
639 int words = bits >> 5;
644 if (memcmp(a1, a2, words << 2))
654 mask = htonl((0xffffffff) << (32 - bits));
656 if ((w1 ^ w2) & mask)
663 static int inet_diag_bc_run(const struct nlattr *_bc,
664 const struct inet_diag_entry *entry)
666 const void *bc = nla_data(_bc);
667 int len = nla_len(_bc);
671 const struct inet_diag_bc_op *op = bc;
674 case INET_DIAG_BC_NOP:
676 case INET_DIAG_BC_JMP:
679 case INET_DIAG_BC_S_EQ:
680 yes = entry->sport == op[1].no;
682 case INET_DIAG_BC_S_GE:
683 yes = entry->sport >= op[1].no;
685 case INET_DIAG_BC_S_LE:
686 yes = entry->sport <= op[1].no;
688 case INET_DIAG_BC_D_EQ:
689 yes = entry->dport == op[1].no;
691 case INET_DIAG_BC_D_GE:
692 yes = entry->dport >= op[1].no;
694 case INET_DIAG_BC_D_LE:
695 yes = entry->dport <= op[1].no;
697 case INET_DIAG_BC_AUTO:
698 yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
700 case INET_DIAG_BC_S_COND:
701 case INET_DIAG_BC_D_COND: {
702 const struct inet_diag_hostcond *cond;
705 cond = (const struct inet_diag_hostcond *)(op + 1);
706 if (cond->port != -1 &&
707 cond->port != (op->code == INET_DIAG_BC_S_COND ?
708 entry->sport : entry->dport)) {
713 if (op->code == INET_DIAG_BC_S_COND)
718 if (cond->family != AF_UNSPEC &&
719 cond->family != entry->family) {
720 if (entry->family == AF_INET6 &&
721 cond->family == AF_INET) {
722 if (addr[0] == 0 && addr[1] == 0 &&
723 addr[2] == htonl(0xffff) &&
724 bitstring_match(addr + 3,
733 if (cond->prefix_len == 0)
735 if (bitstring_match(addr, cond->addr,
741 case INET_DIAG_BC_DEV_COND: {
744 ifindex = *((const u32 *)(op + 1));
745 if (ifindex != entry->ifindex)
749 case INET_DIAG_BC_MARK_COND: {
750 struct inet_diag_markcond *cond;
752 cond = (struct inet_diag_markcond *)(op + 1);
753 if ((entry->mark & cond->mask) != cond->mark)
757 #ifdef CONFIG_SOCK_CGROUP_DATA
758 case INET_DIAG_BC_CGROUP_COND: {
761 cgroup_id = get_unaligned((const u64 *)(op + 1));
762 if (cgroup_id != entry->cgroup_id)
780 /* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
782 static void entry_fill_addrs(struct inet_diag_entry *entry,
783 const struct sock *sk)
785 #if IS_ENABLED(CONFIG_IPV6)
786 if (sk->sk_family == AF_INET6) {
787 entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
788 entry->daddr = sk->sk_v6_daddr.s6_addr32;
792 entry->saddr = &sk->sk_rcv_saddr;
793 entry->daddr = &sk->sk_daddr;
797 int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
799 struct inet_sock *inet = inet_sk(sk);
800 struct inet_diag_entry entry;
805 entry.family = sk->sk_family;
806 entry_fill_addrs(&entry, sk);
807 entry.sport = inet->inet_num;
808 entry.dport = ntohs(inet->inet_dport);
809 entry.ifindex = sk->sk_bound_dev_if;
810 entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
812 entry.mark = READ_ONCE(sk->sk_mark);
813 else if (sk->sk_state == TCP_NEW_SYN_RECV)
814 entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
815 else if (sk->sk_state == TCP_TIME_WAIT)
816 entry.mark = inet_twsk(sk)->tw_mark;
819 #ifdef CONFIG_SOCK_CGROUP_DATA
820 entry.cgroup_id = sk_fullsock(sk) ?
821 cgroup_id(sock_cgroup_ptr(&sk->sk_cgrp_data)) : 0;
824 return inet_diag_bc_run(bc, &entry);
826 EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
828 static int valid_cc(const void *bc, int len, int cc)
831 const struct inet_diag_bc_op *op = bc;
837 if (op->yes < 4 || op->yes & 3)
845 /* data is u32 ifindex */
846 static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
849 /* Check ifindex space. */
850 *min_len += sizeof(u32);
856 /* Validate an inet_diag_hostcond. */
857 static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
860 struct inet_diag_hostcond *cond;
863 /* Check hostcond space. */
864 *min_len += sizeof(struct inet_diag_hostcond);
867 cond = (struct inet_diag_hostcond *)(op + 1);
869 /* Check address family and address length. */
870 switch (cond->family) {
875 addr_len = sizeof(struct in_addr);
878 addr_len = sizeof(struct in6_addr);
883 *min_len += addr_len;
887 /* Check prefix length (in bits) vs address length (in bytes). */
888 if (cond->prefix_len > 8 * addr_len)
894 /* Validate a port comparison operator. */
895 static bool valid_port_comparison(const struct inet_diag_bc_op *op,
896 int len, int *min_len)
898 /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
899 *min_len += sizeof(struct inet_diag_bc_op);
905 static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
908 *min_len += sizeof(struct inet_diag_markcond);
909 return len >= *min_len;
912 #ifdef CONFIG_SOCK_CGROUP_DATA
913 static bool valid_cgroupcond(const struct inet_diag_bc_op *op, int len,
916 *min_len += sizeof(u64);
917 return len >= *min_len;
921 static int inet_diag_bc_audit(const struct nlattr *attr,
922 const struct sk_buff *skb)
924 bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
925 const void *bytecode, *bc;
926 int bytecode_len, len;
928 if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
931 bytecode = bc = nla_data(attr);
932 len = bytecode_len = nla_len(attr);
935 int min_len = sizeof(struct inet_diag_bc_op);
936 const struct inet_diag_bc_op *op = bc;
939 case INET_DIAG_BC_S_COND:
940 case INET_DIAG_BC_D_COND:
941 if (!valid_hostcond(bc, len, &min_len))
944 case INET_DIAG_BC_DEV_COND:
945 if (!valid_devcond(bc, len, &min_len))
948 case INET_DIAG_BC_S_EQ:
949 case INET_DIAG_BC_S_GE:
950 case INET_DIAG_BC_S_LE:
951 case INET_DIAG_BC_D_EQ:
952 case INET_DIAG_BC_D_GE:
953 case INET_DIAG_BC_D_LE:
954 if (!valid_port_comparison(bc, len, &min_len))
957 case INET_DIAG_BC_MARK_COND:
960 if (!valid_markcond(bc, len, &min_len))
963 #ifdef CONFIG_SOCK_CGROUP_DATA
964 case INET_DIAG_BC_CGROUP_COND:
965 if (!valid_cgroupcond(bc, len, &min_len))
969 case INET_DIAG_BC_AUTO:
970 case INET_DIAG_BC_JMP:
971 case INET_DIAG_BC_NOP:
977 if (op->code != INET_DIAG_BC_NOP) {
978 if (op->no < min_len || op->no > len + 4 || op->no & 3)
981 !valid_cc(bytecode, bytecode_len, len - op->no))
985 if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
990 return len == 0 ? 0 : -EINVAL;
993 static void twsk_build_assert(void)
995 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
996 offsetof(struct sock, sk_family));
998 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
999 offsetof(struct inet_sock, inet_num));
1001 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
1002 offsetof(struct inet_sock, inet_dport));
1004 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
1005 offsetof(struct inet_sock, inet_rcv_saddr));
1007 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
1008 offsetof(struct inet_sock, inet_daddr));
1010 #if IS_ENABLED(CONFIG_IPV6)
1011 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
1012 offsetof(struct sock, sk_v6_rcv_saddr));
1014 BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
1015 offsetof(struct sock, sk_v6_daddr));
1019 void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
1020 struct netlink_callback *cb,
1021 const struct inet_diag_req_v2 *r)
1023 bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
1024 struct inet_diag_dump_data *cb_data = cb->data;
1025 struct net *net = sock_net(skb->sk);
1026 u32 idiag_states = r->idiag_states;
1027 int i, num, s_i, s_num;
1031 bc = cb_data->inet_diag_nla_bc;
1032 if (idiag_states & TCPF_SYN_RECV)
1033 idiag_states |= TCPF_NEW_SYN_RECV;
1035 s_num = num = cb->args[2];
1037 if (cb->args[0] == 0) {
1038 if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
1039 goto skip_listen_ht;
1041 for (i = s_i; i <= hashinfo->lhash2_mask; i++) {
1042 struct inet_listen_hashbucket *ilb;
1043 struct hlist_nulls_node *node;
1046 ilb = &hashinfo->lhash2[i];
1048 if (hlist_nulls_empty(&ilb->nulls_head)) {
1052 spin_lock(&ilb->lock);
1053 sk_nulls_for_each(sk, node, &ilb->nulls_head) {
1054 struct inet_sock *inet = inet_sk(sk);
1056 if (!net_eq(sock_net(sk), net))
1064 if (r->sdiag_family != AF_UNSPEC &&
1065 sk->sk_family != r->sdiag_family)
1068 if (r->id.idiag_sport != inet->inet_sport &&
1072 if (!inet_diag_bc_sk(bc, sk))
1075 if (inet_sk_diag_fill(sk, inet_csk(sk), skb,
1078 spin_unlock(&ilb->lock);
1085 spin_unlock(&ilb->lock);
1091 s_i = num = s_num = 0;
1094 /* Process a maximum of SKARR_SZ sockets at a time when walking hash buckets
1099 /* Dump bound but inactive (not listening, connecting, etc.) sockets */
1100 if (cb->args[0] == 1) {
1101 if (!(idiag_states & TCPF_BOUND_INACTIVE))
1104 for (i = s_i; i < hashinfo->bhash_size; i++) {
1105 struct inet_bind_hashbucket *ibb;
1106 struct inet_bind2_bucket *tb2;
1107 struct sock *sk_arr[SKARR_SZ];
1108 int num_arr[SKARR_SZ];
1109 int idx, accum, res;
1114 ibb = &hashinfo->bhash2[i];
1116 if (hlist_empty(&ibb->chain)) {
1120 spin_lock_bh(&ibb->lock);
1121 inet_bind_bucket_for_each(tb2, &ibb->chain) {
1122 if (!net_eq(ib2_net(tb2), net))
1125 sk_for_each_bound(sk, &tb2->owners) {
1126 struct inet_sock *inet = inet_sk(sk);
1131 if (sk->sk_state != TCP_CLOSE ||
1135 if (r->sdiag_family != AF_UNSPEC &&
1136 r->sdiag_family != sk->sk_family)
1139 if (!inet_diag_bc_sk(bc, sk))
1143 num_arr[accum] = num;
1145 if (++accum == SKARR_SZ)
1146 goto pause_bind_walk;
1152 spin_unlock_bh(&ibb->lock);
1155 for (idx = 0; idx < accum; idx++) {
1157 res = inet_sk_diag_fill(sk_arr[idx],
1164 sock_put(sk_arr[idx]);
1171 if (accum == SKARR_SZ) {
1173 goto resume_bind_walk;
1180 s_i = num = s_num = 0;
1183 if (!(idiag_states & ~TCPF_LISTEN))
1186 for (i = s_i; i <= hashinfo->ehash_mask; i++) {
1187 struct inet_ehash_bucket *head = &hashinfo->ehash[i];
1188 spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
1189 struct hlist_nulls_node *node;
1190 struct sock *sk_arr[SKARR_SZ];
1191 int num_arr[SKARR_SZ];
1192 int idx, accum, res;
1194 if (hlist_nulls_empty(&head->chain))
1204 sk_nulls_for_each(sk, node, &head->chain) {
1207 if (!net_eq(sock_net(sk), net))
1211 state = (sk->sk_state == TCP_TIME_WAIT) ?
1212 inet_twsk(sk)->tw_substate : sk->sk_state;
1213 if (!(idiag_states & (1 << state)))
1215 if (r->sdiag_family != AF_UNSPEC &&
1216 sk->sk_family != r->sdiag_family)
1218 if (r->id.idiag_sport != htons(sk->sk_num) &&
1221 if (r->id.idiag_dport != sk->sk_dport &&
1224 twsk_build_assert();
1226 if (!inet_diag_bc_sk(bc, sk))
1229 if (!refcount_inc_not_zero(&sk->sk_refcnt))
1232 num_arr[accum] = num;
1234 if (++accum == SKARR_SZ)
1239 spin_unlock_bh(lock);
1241 for (idx = 0; idx < accum; idx++) {
1243 res = sk_diag_fill(sk_arr[idx], skb, cb, r,
1244 NLM_F_MULTI, net_admin);
1248 sock_gen_put(sk_arr[idx]);
1253 if (accum == SKARR_SZ) {
1265 EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
1267 static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
1268 const struct inet_diag_req_v2 *r)
1270 struct inet_diag_dump_data *cb_data = cb->data;
1271 const struct inet_diag_handler *handler;
1272 u32 prev_min_dump_alloc;
1273 int protocol, err = 0;
1275 protocol = inet_diag_get_protocol(r, cb_data);
1278 prev_min_dump_alloc = cb->min_dump_alloc;
1279 handler = inet_diag_lock_handler(protocol);
1281 handler->dump(skb, cb, r);
1282 inet_diag_unlock_handler(handler);
1286 /* The skb is not large enough to fit one sk info and
1287 * inet_sk_diag_fill() has requested for a larger skb.
1289 if (!skb->len && cb->min_dump_alloc > prev_min_dump_alloc) {
1290 err = pskb_expand_head(skb, 0, cb->min_dump_alloc, GFP_KERNEL);
1295 return err ? : skb->len;
1298 static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
1300 return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh));
1303 static int __inet_diag_dump_start(struct netlink_callback *cb, int hdrlen)
1305 const struct nlmsghdr *nlh = cb->nlh;
1306 struct inet_diag_dump_data *cb_data;
1307 struct sk_buff *skb = cb->skb;
1311 cb_data = kzalloc(sizeof(*cb_data), GFP_KERNEL);
1315 err = inet_diag_parse_attrs(nlh, hdrlen, cb_data->req_nlas);
1320 nla = cb_data->inet_diag_nla_bc;
1322 err = inet_diag_bc_audit(nla, skb);
1329 nla = cb_data->inet_diag_nla_bpf_stgs;
1331 struct bpf_sk_storage_diag *bpf_stg_diag;
1333 bpf_stg_diag = bpf_sk_storage_diag_alloc(nla);
1334 if (IS_ERR(bpf_stg_diag)) {
1336 return PTR_ERR(bpf_stg_diag);
1338 cb_data->bpf_stg_diag = bpf_stg_diag;
1345 static int inet_diag_dump_start(struct netlink_callback *cb)
1347 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req_v2));
1350 static int inet_diag_dump_start_compat(struct netlink_callback *cb)
1352 return __inet_diag_dump_start(cb, sizeof(struct inet_diag_req));
1355 static int inet_diag_dump_done(struct netlink_callback *cb)
1357 struct inet_diag_dump_data *cb_data = cb->data;
1359 bpf_sk_storage_diag_free(cb_data->bpf_stg_diag);
1365 static int inet_diag_type2proto(int type)
1368 case TCPDIAG_GETSOCK:
1370 case DCCPDIAG_GETSOCK:
1371 return IPPROTO_DCCP;
1377 static int inet_diag_dump_compat(struct sk_buff *skb,
1378 struct netlink_callback *cb)
1380 struct inet_diag_req *rc = nlmsg_data(cb->nlh);
1381 struct inet_diag_req_v2 req;
1383 req.sdiag_family = AF_UNSPEC; /* compatibility */
1384 req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
1385 req.idiag_ext = rc->idiag_ext;
1386 req.idiag_states = rc->idiag_states;
1389 return __inet_diag_dump(skb, cb, &req);
1392 static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
1393 const struct nlmsghdr *nlh)
1395 struct inet_diag_req *rc = nlmsg_data(nlh);
1396 struct inet_diag_req_v2 req;
1398 req.sdiag_family = rc->idiag_family;
1399 req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
1400 req.idiag_ext = rc->idiag_ext;
1401 req.idiag_states = rc->idiag_states;
1404 return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh,
1405 sizeof(struct inet_diag_req), &req);
1408 static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
1410 int hdrlen = sizeof(struct inet_diag_req);
1411 struct net *net = sock_net(skb->sk);
1413 if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
1414 nlmsg_len(nlh) < hdrlen)
1417 if (nlh->nlmsg_flags & NLM_F_DUMP) {
1418 struct netlink_dump_control c = {
1419 .start = inet_diag_dump_start_compat,
1420 .done = inet_diag_dump_done,
1421 .dump = inet_diag_dump_compat,
1423 return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
1426 return inet_diag_get_exact_compat(skb, nlh);
1429 static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
1431 int hdrlen = sizeof(struct inet_diag_req_v2);
1432 struct net *net = sock_net(skb->sk);
1434 if (nlmsg_len(h) < hdrlen)
1437 if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
1438 h->nlmsg_flags & NLM_F_DUMP) {
1439 struct netlink_dump_control c = {
1440 .start = inet_diag_dump_start,
1441 .done = inet_diag_dump_done,
1442 .dump = inet_diag_dump,
1444 return netlink_dump_start(net->diag_nlsk, skb, h, &c);
1447 return inet_diag_cmd_exact(h->nlmsg_type, skb, h, hdrlen,
1452 int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
1454 const struct inet_diag_handler *handler;
1455 struct nlmsghdr *nlh;
1456 struct nlattr *attr;
1457 struct inet_diag_msg *r;
1461 nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
1465 r = nlmsg_data(nlh);
1466 memset(r, 0, sizeof(*r));
1467 inet_diag_msg_common_fill(r, sk);
1468 if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
1469 r->id.idiag_sport = inet_sk(sk)->inet_sport;
1470 r->idiag_state = sk->sk_state;
1472 if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
1473 nlmsg_cancel(skb, nlh);
1477 handler = inet_diag_lock_handler(sk->sk_protocol);
1479 nlmsg_cancel(skb, nlh);
1483 attr = handler->idiag_info_size
1484 ? nla_reserve_64bit(skb, INET_DIAG_INFO,
1485 handler->idiag_info_size,
1489 info = nla_data(attr);
1491 handler->idiag_get_info(sk, r, info);
1492 inet_diag_unlock_handler(handler);
1494 nlmsg_end(skb, nlh);
1498 static const struct sock_diag_handler inet_diag_handler = {
1499 .owner = THIS_MODULE,
1501 .dump = inet_diag_handler_cmd,
1502 .get_info = inet_diag_handler_get_info,
1503 .destroy = inet_diag_handler_cmd,
1506 static const struct sock_diag_handler inet6_diag_handler = {
1507 .owner = THIS_MODULE,
1509 .dump = inet_diag_handler_cmd,
1510 .get_info = inet_diag_handler_get_info,
1511 .destroy = inet_diag_handler_cmd,
1514 int inet_diag_register(const struct inet_diag_handler *h)
1516 const __u16 type = h->idiag_type;
1518 if (type >= IPPROTO_MAX)
1521 return !cmpxchg((const struct inet_diag_handler **)&inet_diag_table[type],
1522 NULL, h) ? 0 : -EEXIST;
1524 EXPORT_SYMBOL_GPL(inet_diag_register);
1526 void inet_diag_unregister(const struct inet_diag_handler *h)
1528 const __u16 type = h->idiag_type;
1530 if (type >= IPPROTO_MAX)
1533 xchg((const struct inet_diag_handler **)&inet_diag_table[type],
1536 EXPORT_SYMBOL_GPL(inet_diag_unregister);
1538 static const struct sock_diag_inet_compat inet_diag_compat = {
1539 .owner = THIS_MODULE,
1540 .fn = inet_diag_rcv_msg_compat,
1543 static int __init inet_diag_init(void)
1545 const int inet_diag_table_size = (IPPROTO_MAX *
1546 sizeof(struct inet_diag_handler *));
1549 inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
1550 if (!inet_diag_table)
1553 err = sock_diag_register(&inet_diag_handler);
1557 err = sock_diag_register(&inet6_diag_handler);
1561 sock_diag_register_inet_compat(&inet_diag_compat);
1566 sock_diag_unregister(&inet_diag_handler);
1568 kfree(inet_diag_table);
1572 static void __exit inet_diag_exit(void)
1574 sock_diag_unregister(&inet6_diag_handler);
1575 sock_diag_unregister(&inet_diag_handler);
1576 sock_diag_unregister_inet_compat(&inet_diag_compat);
1577 kfree(inet_diag_table);
1580 module_init(inet_diag_init);
1581 module_exit(inet_diag_exit);
1582 MODULE_LICENSE("GPL");
1583 MODULE_DESCRIPTION("INET/INET6: socket monitoring via SOCK_DIAG");
1584 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
1585 MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);