v4.19.13 snapshot.
diff --git a/net/ipv4/inet_diag.c b/net/ipv4/inet_diag.c
new file mode 100644
index 0000000..4e5bc4b
--- /dev/null
+++ b/net/ipv4/inet_diag.c
@@ -0,0 +1,1313 @@
+/*
+ * inet_diag.c Module for monitoring INET transport protocols sockets.
+ *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <linux/fcntl.h>
+#include <linux/random.h>
+#include <linux/slab.h>
+#include <linux/cache.h>
+#include <linux/init.h>
+#include <linux/time.h>
+
+#include <net/icmp.h>
+#include <net/tcp.h>
+#include <net/ipv6.h>
+#include <net/inet_common.h>
+#include <net/inet_connection_sock.h>
+#include <net/inet_hashtables.h>
+#include <net/inet_timewait_sock.h>
+#include <net/inet6_hashtables.h>
+#include <net/netlink.h>
+
+#include <linux/inet.h>
+#include <linux/stddef.h>
+
+#include <linux/inet_diag.h>
+#include <linux/sock_diag.h>
+
+static const struct inet_diag_handler **inet_diag_table;
+
+struct inet_diag_entry {
+ const __be32 *saddr;
+ const __be32 *daddr;
+ u16 sport;
+ u16 dport;
+ u16 family;
+ u16 userlocks;
+ u32 ifindex;
+ u32 mark;
+};
+
+static DEFINE_MUTEX(inet_diag_table_mutex);
+
+static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
+{
+ if (!inet_diag_table[proto])
+ sock_load_diag_module(AF_INET, proto);
+
+ mutex_lock(&inet_diag_table_mutex);
+ if (!inet_diag_table[proto])
+ return ERR_PTR(-ENOENT);
+
+ return inet_diag_table[proto];
+}
+
+static void inet_diag_unlock_handler(const struct inet_diag_handler *handler)
+{
+ mutex_unlock(&inet_diag_table_mutex);
+}
+
+void inet_diag_msg_common_fill(struct inet_diag_msg *r, struct sock *sk)
+{
+ r->idiag_family = sk->sk_family;
+
+ r->id.idiag_sport = htons(sk->sk_num);
+ r->id.idiag_dport = sk->sk_dport;
+ r->id.idiag_if = sk->sk_bound_dev_if;
+ sock_diag_save_cookie(sk, r->id.idiag_cookie);
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6) {
+ *(struct in6_addr *)r->id.idiag_src = sk->sk_v6_rcv_saddr;
+ *(struct in6_addr *)r->id.idiag_dst = sk->sk_v6_daddr;
+ } else
+#endif
+ {
+ memset(&r->id.idiag_src, 0, sizeof(r->id.idiag_src));
+ memset(&r->id.idiag_dst, 0, sizeof(r->id.idiag_dst));
+
+ r->id.idiag_src[0] = sk->sk_rcv_saddr;
+ r->id.idiag_dst[0] = sk->sk_daddr;
+ }
+}
+EXPORT_SYMBOL_GPL(inet_diag_msg_common_fill);
+
+static size_t inet_sk_attr_size(struct sock *sk,
+ const struct inet_diag_req_v2 *req,
+ bool net_admin)
+{
+ const struct inet_diag_handler *handler;
+ size_t aux = 0;
+
+ handler = inet_diag_table[req->sdiag_protocol];
+ if (handler && handler->idiag_get_aux_size)
+ aux = handler->idiag_get_aux_size(sk, net_admin);
+
+ return nla_total_size(sizeof(struct tcp_info))
+ + nla_total_size(1) /* INET_DIAG_SHUTDOWN */
+ + nla_total_size(1) /* INET_DIAG_TOS */
+ + nla_total_size(1) /* INET_DIAG_TCLASS */
+ + nla_total_size(4) /* INET_DIAG_MARK */
+ + nla_total_size(sizeof(struct inet_diag_meminfo))
+ + nla_total_size(sizeof(struct inet_diag_msg))
+ + nla_total_size(SK_MEMINFO_VARS * sizeof(u32))
+ + nla_total_size(TCP_CA_NAME_MAX)
+ + nla_total_size(sizeof(struct tcpvegas_info))
+ + aux
+ + 64;
+}
+
+int inet_diag_msg_attrs_fill(struct sock *sk, struct sk_buff *skb,
+ struct inet_diag_msg *r, int ext,
+ struct user_namespace *user_ns,
+ bool net_admin)
+{
+ const struct inet_sock *inet = inet_sk(sk);
+
+ if (nla_put_u8(skb, INET_DIAG_SHUTDOWN, sk->sk_shutdown))
+ goto errout;
+
+ /* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
+ * hence this needs to be included regardless of socket family.
+ */
+ if (ext & (1 << (INET_DIAG_TOS - 1)))
+ if (nla_put_u8(skb, INET_DIAG_TOS, inet->tos) < 0)
+ goto errout;
+
+#if IS_ENABLED(CONFIG_IPV6)
+ if (r->idiag_family == AF_INET6) {
+ if (ext & (1 << (INET_DIAG_TCLASS - 1)))
+ if (nla_put_u8(skb, INET_DIAG_TCLASS,
+ inet6_sk(sk)->tclass) < 0)
+ goto errout;
+
+ if (((1 << sk->sk_state) & (TCPF_LISTEN | TCPF_CLOSE)) &&
+ nla_put_u8(skb, INET_DIAG_SKV6ONLY, ipv6_only_sock(sk)))
+ goto errout;
+ }
+#endif
+
+ if (net_admin && nla_put_u32(skb, INET_DIAG_MARK, sk->sk_mark))
+ goto errout;
+
+ r->idiag_uid = from_kuid_munged(user_ns, sock_i_uid(sk));
+ r->idiag_inode = sock_i_ino(sk);
+
+ return 0;
+errout:
+ return 1;
+}
+EXPORT_SYMBOL_GPL(inet_diag_msg_attrs_fill);
+
+int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
+ struct sk_buff *skb, const struct inet_diag_req_v2 *req,
+ struct user_namespace *user_ns,
+ u32 portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh,
+ bool net_admin)
+{
+ const struct tcp_congestion_ops *ca_ops;
+ const struct inet_diag_handler *handler;
+ int ext = req->idiag_ext;
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ struct nlattr *attr;
+ void *info = NULL;
+
+ handler = inet_diag_table[req->sdiag_protocol];
+ BUG_ON(!handler);
+
+ nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
+ nlmsg_flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ r = nlmsg_data(nlh);
+ BUG_ON(!sk_fullsock(sk));
+
+ inet_diag_msg_common_fill(r, sk);
+ r->idiag_state = sk->sk_state;
+ r->idiag_timer = 0;
+ r->idiag_retrans = 0;
+
+ if (inet_diag_msg_attrs_fill(sk, skb, r, ext, user_ns, net_admin))
+ goto errout;
+
+ if (ext & (1 << (INET_DIAG_MEMINFO - 1))) {
+ struct inet_diag_meminfo minfo = {
+ .idiag_rmem = sk_rmem_alloc_get(sk),
+ .idiag_wmem = sk->sk_wmem_queued,
+ .idiag_fmem = sk->sk_forward_alloc,
+ .idiag_tmem = sk_wmem_alloc_get(sk),
+ };
+
+ if (nla_put(skb, INET_DIAG_MEMINFO, sizeof(minfo), &minfo) < 0)
+ goto errout;
+ }
+
+ if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
+ if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
+ goto errout;
+
+ /*
+ * RAW sockets might have user-defined protocols assigned,
+ * so report the one supplied on socket creation.
+ */
+ if (sk->sk_type == SOCK_RAW) {
+ if (nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))
+ goto errout;
+ }
+
+ if (!icsk) {
+ handler->idiag_get_info(sk, r, NULL);
+ goto out;
+ }
+
+ if (icsk->icsk_pending == ICSK_TIME_RETRANS ||
+ icsk->icsk_pending == ICSK_TIME_REO_TIMEOUT ||
+ icsk->icsk_pending == ICSK_TIME_LOSS_PROBE) {
+ r->idiag_timer = 1;
+ r->idiag_retrans = icsk->icsk_retransmits;
+ r->idiag_expires =
+ jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+ } else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
+ r->idiag_timer = 4;
+ r->idiag_retrans = icsk->icsk_probes_out;
+ r->idiag_expires =
+ jiffies_to_msecs(icsk->icsk_timeout - jiffies);
+ } else if (timer_pending(&sk->sk_timer)) {
+ r->idiag_timer = 2;
+ r->idiag_retrans = icsk->icsk_probes_out;
+ r->idiag_expires =
+ jiffies_to_msecs(sk->sk_timer.expires - jiffies);
+ } else {
+ r->idiag_timer = 0;
+ r->idiag_expires = 0;
+ }
+
+ if ((ext & (1 << (INET_DIAG_INFO - 1))) && handler->idiag_info_size) {
+ attr = nla_reserve_64bit(skb, INET_DIAG_INFO,
+ handler->idiag_info_size,
+ INET_DIAG_PAD);
+ if (!attr)
+ goto errout;
+
+ info = nla_data(attr);
+ }
+
+ if (ext & (1 << (INET_DIAG_CONG - 1))) {
+ int err = 0;
+
+ rcu_read_lock();
+ ca_ops = READ_ONCE(icsk->icsk_ca_ops);
+ if (ca_ops)
+ err = nla_put_string(skb, INET_DIAG_CONG, ca_ops->name);
+ rcu_read_unlock();
+ if (err < 0)
+ goto errout;
+ }
+
+ handler->idiag_get_info(sk, r, info);
+
+ if (ext & (1 << (INET_DIAG_INFO - 1)) && handler->idiag_get_aux)
+ if (handler->idiag_get_aux(sk, net_admin, skb) < 0)
+ goto errout;
+
+ if (sk->sk_state < TCP_TIME_WAIT) {
+ union tcp_cc_info info;
+ size_t sz = 0;
+ int attr;
+
+ rcu_read_lock();
+ ca_ops = READ_ONCE(icsk->icsk_ca_ops);
+ if (ca_ops && ca_ops->get_info)
+ sz = ca_ops->get_info(sk, ext, &attr, &info);
+ rcu_read_unlock();
+ if (sz && nla_put(skb, attr, sz, &info) < 0)
+ goto errout;
+ }
+
+ if (ext & (1 << (INET_DIAG_CLASS_ID - 1))) {
+ u32 classid = 0;
+
+#ifdef CONFIG_SOCK_CGROUP_DATA
+ classid = sock_cgroup_classid(&sk->sk_cgrp_data);
+#endif
+
+ if (nla_put_u32(skb, INET_DIAG_CLASS_ID, classid))
+ goto errout;
+ }
+
+out:
+ nlmsg_end(skb, nlh);
+ return 0;
+
+errout:
+ nlmsg_cancel(skb, nlh);
+ return -EMSGSIZE;
+}
+EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
+
+static int inet_csk_diag_fill(struct sock *sk,
+ struct sk_buff *skb,
+ const struct inet_diag_req_v2 *req,
+ struct user_namespace *user_ns,
+ u32 portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh,
+ bool net_admin)
+{
+ return inet_sk_diag_fill(sk, inet_csk(sk), skb, req, user_ns,
+ portid, seq, nlmsg_flags, unlh, net_admin);
+}
+
+static int inet_twsk_diag_fill(struct sock *sk,
+ struct sk_buff *skb,
+ u32 portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh)
+{
+ struct inet_timewait_sock *tw = inet_twsk(sk);
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ long tmo;
+
+ nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
+ nlmsg_flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ r = nlmsg_data(nlh);
+ BUG_ON(tw->tw_state != TCP_TIME_WAIT);
+
+ tmo = tw->tw_timer.expires - jiffies;
+ if (tmo < 0)
+ tmo = 0;
+
+ inet_diag_msg_common_fill(r, sk);
+ r->idiag_retrans = 0;
+
+ r->idiag_state = tw->tw_substate;
+ r->idiag_timer = 3;
+ r->idiag_expires = jiffies_to_msecs(tmo);
+ r->idiag_rqueue = 0;
+ r->idiag_wqueue = 0;
+ r->idiag_uid = 0;
+ r->idiag_inode = 0;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int inet_req_diag_fill(struct sock *sk, struct sk_buff *skb,
+ u32 portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh, bool net_admin)
+{
+ struct request_sock *reqsk = inet_reqsk(sk);
+ struct inet_diag_msg *r;
+ struct nlmsghdr *nlh;
+ long tmo;
+
+ nlh = nlmsg_put(skb, portid, seq, unlh->nlmsg_type, sizeof(*r),
+ nlmsg_flags);
+ if (!nlh)
+ return -EMSGSIZE;
+
+ r = nlmsg_data(nlh);
+ inet_diag_msg_common_fill(r, sk);
+ r->idiag_state = TCP_SYN_RECV;
+ r->idiag_timer = 1;
+ r->idiag_retrans = reqsk->num_retrans;
+
+ BUILD_BUG_ON(offsetof(struct inet_request_sock, ir_cookie) !=
+ offsetof(struct sock, sk_cookie));
+
+ tmo = inet_reqsk(sk)->rsk_timer.expires - jiffies;
+ r->idiag_expires = (tmo >= 0) ? jiffies_to_msecs(tmo) : 0;
+ r->idiag_rqueue = 0;
+ r->idiag_wqueue = 0;
+ r->idiag_uid = 0;
+ r->idiag_inode = 0;
+
+ if (net_admin && nla_put_u32(skb, INET_DIAG_MARK,
+ inet_rsk(reqsk)->ir_mark))
+ return -EMSGSIZE;
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
+ const struct inet_diag_req_v2 *r,
+ struct user_namespace *user_ns,
+ u32 portid, u32 seq, u16 nlmsg_flags,
+ const struct nlmsghdr *unlh, bool net_admin)
+{
+ if (sk->sk_state == TCP_TIME_WAIT)
+ return inet_twsk_diag_fill(sk, skb, portid, seq,
+ nlmsg_flags, unlh);
+
+ if (sk->sk_state == TCP_NEW_SYN_RECV)
+ return inet_req_diag_fill(sk, skb, portid, seq,
+ nlmsg_flags, unlh, net_admin);
+
+ return inet_csk_diag_fill(sk, skb, r, user_ns, portid, seq,
+ nlmsg_flags, unlh, net_admin);
+}
+
+struct sock *inet_diag_find_one_icsk(struct net *net,
+ struct inet_hashinfo *hashinfo,
+ const struct inet_diag_req_v2 *req)
+{
+ struct sock *sk;
+
+ rcu_read_lock();
+ if (req->sdiag_family == AF_INET)
+ sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[0],
+ req->id.idiag_dport, req->id.idiag_src[0],
+ req->id.idiag_sport, req->id.idiag_if);
+#if IS_ENABLED(CONFIG_IPV6)
+ else if (req->sdiag_family == AF_INET6) {
+ if (ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_dst) &&
+ ipv6_addr_v4mapped((struct in6_addr *)req->id.idiag_src))
+ sk = inet_lookup(net, hashinfo, NULL, 0, req->id.idiag_dst[3],
+ req->id.idiag_dport, req->id.idiag_src[3],
+ req->id.idiag_sport, req->id.idiag_if);
+ else
+ sk = inet6_lookup(net, hashinfo, NULL, 0,
+ (struct in6_addr *)req->id.idiag_dst,
+ req->id.idiag_dport,
+ (struct in6_addr *)req->id.idiag_src,
+ req->id.idiag_sport,
+ req->id.idiag_if);
+ }
+#endif
+ else {
+ rcu_read_unlock();
+ return ERR_PTR(-EINVAL);
+ }
+ rcu_read_unlock();
+ if (!sk)
+ return ERR_PTR(-ENOENT);
+
+ if (sock_diag_check_cookie(sk, req->id.idiag_cookie)) {
+ sock_gen_put(sk);
+ return ERR_PTR(-ENOENT);
+ }
+
+ return sk;
+}
+EXPORT_SYMBOL_GPL(inet_diag_find_one_icsk);
+
+int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo,
+ struct sk_buff *in_skb,
+ const struct nlmsghdr *nlh,
+ const struct inet_diag_req_v2 *req)
+{
+ bool net_admin = netlink_net_capable(in_skb, CAP_NET_ADMIN);
+ struct net *net = sock_net(in_skb->sk);
+ struct sk_buff *rep;
+ struct sock *sk;
+ int err;
+
+ sk = inet_diag_find_one_icsk(net, hashinfo, req);
+ if (IS_ERR(sk))
+ return PTR_ERR(sk);
+
+ rep = nlmsg_new(inet_sk_attr_size(sk, req, net_admin), GFP_KERNEL);
+ if (!rep) {
+ err = -ENOMEM;
+ goto out;
+ }
+
+ err = sk_diag_fill(sk, rep, req,
+ sk_user_ns(NETLINK_CB(in_skb).sk),
+ NETLINK_CB(in_skb).portid,
+ nlh->nlmsg_seq, 0, nlh, net_admin);
+ if (err < 0) {
+ WARN_ON(err == -EMSGSIZE);
+ nlmsg_free(rep);
+ goto out;
+ }
+ err = netlink_unicast(net->diag_nlsk, rep, NETLINK_CB(in_skb).portid,
+ MSG_DONTWAIT);
+ if (err > 0)
+ err = 0;
+
+out:
+ if (sk)
+ sock_gen_put(sk);
+
+ return err;
+}
+EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
+
+static int inet_diag_cmd_exact(int cmd, struct sk_buff *in_skb,
+ const struct nlmsghdr *nlh,
+ const struct inet_diag_req_v2 *req)
+{
+ const struct inet_diag_handler *handler;
+ int err;
+
+ handler = inet_diag_lock_handler(req->sdiag_protocol);
+ if (IS_ERR(handler))
+ err = PTR_ERR(handler);
+ else if (cmd == SOCK_DIAG_BY_FAMILY)
+ err = handler->dump_one(in_skb, nlh, req);
+ else if (cmd == SOCK_DESTROY && handler->destroy)
+ err = handler->destroy(in_skb, req);
+ else
+ err = -EOPNOTSUPP;
+ inet_diag_unlock_handler(handler);
+
+ return err;
+}
+
+static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
+{
+ int words = bits >> 5;
+
+ bits &= 0x1f;
+
+ if (words) {
+ if (memcmp(a1, a2, words << 2))
+ return 0;
+ }
+ if (bits) {
+ __be32 w1, w2;
+ __be32 mask;
+
+ w1 = a1[words];
+ w2 = a2[words];
+
+ mask = htonl((0xffffffff) << (32 - bits));
+
+ if ((w1 ^ w2) & mask)
+ return 0;
+ }
+
+ return 1;
+}
+
+static int inet_diag_bc_run(const struct nlattr *_bc,
+ const struct inet_diag_entry *entry)
+{
+ const void *bc = nla_data(_bc);
+ int len = nla_len(_bc);
+
+ while (len > 0) {
+ int yes = 1;
+ const struct inet_diag_bc_op *op = bc;
+
+ switch (op->code) {
+ case INET_DIAG_BC_NOP:
+ break;
+ case INET_DIAG_BC_JMP:
+ yes = 0;
+ break;
+ case INET_DIAG_BC_S_EQ:
+ yes = entry->sport == op[1].no;
+ break;
+ case INET_DIAG_BC_S_GE:
+ yes = entry->sport >= op[1].no;
+ break;
+ case INET_DIAG_BC_S_LE:
+ yes = entry->sport <= op[1].no;
+ break;
+ case INET_DIAG_BC_D_EQ:
+ yes = entry->dport == op[1].no;
+ break;
+ case INET_DIAG_BC_D_GE:
+ yes = entry->dport >= op[1].no;
+ break;
+ case INET_DIAG_BC_D_LE:
+ yes = entry->dport <= op[1].no;
+ break;
+ case INET_DIAG_BC_AUTO:
+ yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
+ break;
+ case INET_DIAG_BC_S_COND:
+ case INET_DIAG_BC_D_COND: {
+ const struct inet_diag_hostcond *cond;
+ const __be32 *addr;
+
+ cond = (const struct inet_diag_hostcond *)(op + 1);
+ if (cond->port != -1 &&
+ cond->port != (op->code == INET_DIAG_BC_S_COND ?
+ entry->sport : entry->dport)) {
+ yes = 0;
+ break;
+ }
+
+ if (op->code == INET_DIAG_BC_S_COND)
+ addr = entry->saddr;
+ else
+ addr = entry->daddr;
+
+ if (cond->family != AF_UNSPEC &&
+ cond->family != entry->family) {
+ if (entry->family == AF_INET6 &&
+ cond->family == AF_INET) {
+ if (addr[0] == 0 && addr[1] == 0 &&
+ addr[2] == htonl(0xffff) &&
+ bitstring_match(addr + 3,
+ cond->addr,
+ cond->prefix_len))
+ break;
+ }
+ yes = 0;
+ break;
+ }
+
+ if (cond->prefix_len == 0)
+ break;
+ if (bitstring_match(addr, cond->addr,
+ cond->prefix_len))
+ break;
+ yes = 0;
+ break;
+ }
+ case INET_DIAG_BC_DEV_COND: {
+ u32 ifindex;
+
+ ifindex = *((const u32 *)(op + 1));
+ if (ifindex != entry->ifindex)
+ yes = 0;
+ break;
+ }
+ case INET_DIAG_BC_MARK_COND: {
+ struct inet_diag_markcond *cond;
+
+ cond = (struct inet_diag_markcond *)(op + 1);
+ if ((entry->mark & cond->mask) != cond->mark)
+ yes = 0;
+ break;
+ }
+ }
+
+ if (yes) {
+ len -= op->yes;
+ bc += op->yes;
+ } else {
+ len -= op->no;
+ bc += op->no;
+ }
+ }
+ return len == 0;
+}
+
+/* This helper is available for all sockets (ESTABLISH, TIMEWAIT, SYN_RECV)
+ */
+static void entry_fill_addrs(struct inet_diag_entry *entry,
+ const struct sock *sk)
+{
+#if IS_ENABLED(CONFIG_IPV6)
+ if (sk->sk_family == AF_INET6) {
+ entry->saddr = sk->sk_v6_rcv_saddr.s6_addr32;
+ entry->daddr = sk->sk_v6_daddr.s6_addr32;
+ } else
+#endif
+ {
+ entry->saddr = &sk->sk_rcv_saddr;
+ entry->daddr = &sk->sk_daddr;
+ }
+}
+
+int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
+{
+ struct inet_sock *inet = inet_sk(sk);
+ struct inet_diag_entry entry;
+
+ if (!bc)
+ return 1;
+
+ entry.family = sk->sk_family;
+ entry_fill_addrs(&entry, sk);
+ entry.sport = inet->inet_num;
+ entry.dport = ntohs(inet->inet_dport);
+ entry.ifindex = sk->sk_bound_dev_if;
+ entry.userlocks = sk_fullsock(sk) ? sk->sk_userlocks : 0;
+ if (sk_fullsock(sk))
+ entry.mark = sk->sk_mark;
+ else if (sk->sk_state == TCP_NEW_SYN_RECV)
+ entry.mark = inet_rsk(inet_reqsk(sk))->ir_mark;
+ else
+ entry.mark = 0;
+
+ return inet_diag_bc_run(bc, &entry);
+}
+EXPORT_SYMBOL_GPL(inet_diag_bc_sk);
+
+static int valid_cc(const void *bc, int len, int cc)
+{
+ while (len >= 0) {
+ const struct inet_diag_bc_op *op = bc;
+
+ if (cc > len)
+ return 0;
+ if (cc == len)
+ return 1;
+ if (op->yes < 4 || op->yes & 3)
+ return 0;
+ len -= op->yes;
+ bc += op->yes;
+ }
+ return 0;
+}
+
+/* data is u32 ifindex */
+static bool valid_devcond(const struct inet_diag_bc_op *op, int len,
+ int *min_len)
+{
+ /* Check ifindex space. */
+ *min_len += sizeof(u32);
+ if (len < *min_len)
+ return false;
+
+ return true;
+}
+/* Validate an inet_diag_hostcond. */
+static bool valid_hostcond(const struct inet_diag_bc_op *op, int len,
+ int *min_len)
+{
+ struct inet_diag_hostcond *cond;
+ int addr_len;
+
+ /* Check hostcond space. */
+ *min_len += sizeof(struct inet_diag_hostcond);
+ if (len < *min_len)
+ return false;
+ cond = (struct inet_diag_hostcond *)(op + 1);
+
+ /* Check address family and address length. */
+ switch (cond->family) {
+ case AF_UNSPEC:
+ addr_len = 0;
+ break;
+ case AF_INET:
+ addr_len = sizeof(struct in_addr);
+ break;
+ case AF_INET6:
+ addr_len = sizeof(struct in6_addr);
+ break;
+ default:
+ return false;
+ }
+ *min_len += addr_len;
+ if (len < *min_len)
+ return false;
+
+ /* Check prefix length (in bits) vs address length (in bytes). */
+ if (cond->prefix_len > 8 * addr_len)
+ return false;
+
+ return true;
+}
+
+/* Validate a port comparison operator. */
+static bool valid_port_comparison(const struct inet_diag_bc_op *op,
+ int len, int *min_len)
+{
+ /* Port comparisons put the port in a follow-on inet_diag_bc_op. */
+ *min_len += sizeof(struct inet_diag_bc_op);
+ if (len < *min_len)
+ return false;
+ return true;
+}
+
+static bool valid_markcond(const struct inet_diag_bc_op *op, int len,
+ int *min_len)
+{
+ *min_len += sizeof(struct inet_diag_markcond);
+ return len >= *min_len;
+}
+
+static int inet_diag_bc_audit(const struct nlattr *attr,
+ const struct sk_buff *skb)
+{
+ bool net_admin = netlink_net_capable(skb, CAP_NET_ADMIN);
+ const void *bytecode, *bc;
+ int bytecode_len, len;
+
+ if (!attr || nla_len(attr) < sizeof(struct inet_diag_bc_op))
+ return -EINVAL;
+
+ bytecode = bc = nla_data(attr);
+ len = bytecode_len = nla_len(attr);
+
+ while (len > 0) {
+ int min_len = sizeof(struct inet_diag_bc_op);
+ const struct inet_diag_bc_op *op = bc;
+
+ switch (op->code) {
+ case INET_DIAG_BC_S_COND:
+ case INET_DIAG_BC_D_COND:
+ if (!valid_hostcond(bc, len, &min_len))
+ return -EINVAL;
+ break;
+ case INET_DIAG_BC_DEV_COND:
+ if (!valid_devcond(bc, len, &min_len))
+ return -EINVAL;
+ break;
+ case INET_DIAG_BC_S_EQ:
+ case INET_DIAG_BC_S_GE:
+ case INET_DIAG_BC_S_LE:
+ case INET_DIAG_BC_D_EQ:
+ case INET_DIAG_BC_D_GE:
+ case INET_DIAG_BC_D_LE:
+ if (!valid_port_comparison(bc, len, &min_len))
+ return -EINVAL;
+ break;
+ case INET_DIAG_BC_MARK_COND:
+ if (!net_admin)
+ return -EPERM;
+ if (!valid_markcond(bc, len, &min_len))
+ return -EINVAL;
+ break;
+ case INET_DIAG_BC_AUTO:
+ case INET_DIAG_BC_JMP:
+ case INET_DIAG_BC_NOP:
+ break;
+ default:
+ return -EINVAL;
+ }
+
+ if (op->code != INET_DIAG_BC_NOP) {
+ if (op->no < min_len || op->no > len + 4 || op->no & 3)
+ return -EINVAL;
+ if (op->no < len &&
+ !valid_cc(bytecode, bytecode_len, len - op->no))
+ return -EINVAL;
+ }
+
+ if (op->yes < min_len || op->yes > len + 4 || op->yes & 3)
+ return -EINVAL;
+ bc += op->yes;
+ len -= op->yes;
+ }
+ return len == 0 ? 0 : -EINVAL;
+}
+
+static int inet_csk_diag_dump(struct sock *sk,
+ struct sk_buff *skb,
+ struct netlink_callback *cb,
+ const struct inet_diag_req_v2 *r,
+ const struct nlattr *bc,
+ bool net_admin)
+{
+ if (!inet_diag_bc_sk(bc, sk))
+ return 0;
+
+ return inet_csk_diag_fill(sk, skb, r,
+ sk_user_ns(NETLINK_CB(cb->skb).sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh,
+ net_admin);
+}
+
+static void twsk_build_assert(void)
+{
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_family) !=
+ offsetof(struct sock, sk_family));
+
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_num) !=
+ offsetof(struct inet_sock, inet_num));
+
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_dport) !=
+ offsetof(struct inet_sock, inet_dport));
+
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_rcv_saddr) !=
+ offsetof(struct inet_sock, inet_rcv_saddr));
+
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_daddr) !=
+ offsetof(struct inet_sock, inet_daddr));
+
+#if IS_ENABLED(CONFIG_IPV6)
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_rcv_saddr) !=
+ offsetof(struct sock, sk_v6_rcv_saddr));
+
+ BUILD_BUG_ON(offsetof(struct inet_timewait_sock, tw_v6_daddr) !=
+ offsetof(struct sock, sk_v6_daddr));
+#endif
+}
+
+void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
+ struct netlink_callback *cb,
+ const struct inet_diag_req_v2 *r, struct nlattr *bc)
+{
+ bool net_admin = netlink_net_capable(cb->skb, CAP_NET_ADMIN);
+ struct net *net = sock_net(skb->sk);
+ u32 idiag_states = r->idiag_states;
+ int i, num, s_i, s_num;
+ struct sock *sk;
+
+ if (idiag_states & TCPF_SYN_RECV)
+ idiag_states |= TCPF_NEW_SYN_RECV;
+ s_i = cb->args[1];
+ s_num = num = cb->args[2];
+
+ if (cb->args[0] == 0) {
+ if (!(idiag_states & TCPF_LISTEN) || r->id.idiag_dport)
+ goto skip_listen_ht;
+
+ for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
+ struct inet_listen_hashbucket *ilb;
+
+ num = 0;
+ ilb = &hashinfo->listening_hash[i];
+ spin_lock(&ilb->lock);
+ sk_for_each(sk, &ilb->head) {
+ struct inet_sock *inet = inet_sk(sk);
+
+ if (!net_eq(sock_net(sk), net))
+ continue;
+
+ if (num < s_num) {
+ num++;
+ continue;
+ }
+
+ if (r->sdiag_family != AF_UNSPEC &&
+ sk->sk_family != r->sdiag_family)
+ goto next_listen;
+
+ if (r->id.idiag_sport != inet->inet_sport &&
+ r->id.idiag_sport)
+ goto next_listen;
+
+ if (inet_csk_diag_dump(sk, skb, cb, r,
+ bc, net_admin) < 0) {
+ spin_unlock(&ilb->lock);
+ goto done;
+ }
+
+next_listen:
+ ++num;
+ }
+ spin_unlock(&ilb->lock);
+
+ s_num = 0;
+ }
+skip_listen_ht:
+ cb->args[0] = 1;
+ s_i = num = s_num = 0;
+ }
+
+ if (!(idiag_states & ~TCPF_LISTEN))
+ goto out;
+
+#define SKARR_SZ 16
+ for (i = s_i; i <= hashinfo->ehash_mask; i++) {
+ struct inet_ehash_bucket *head = &hashinfo->ehash[i];
+ spinlock_t *lock = inet_ehash_lockp(hashinfo, i);
+ struct hlist_nulls_node *node;
+ struct sock *sk_arr[SKARR_SZ];
+ int num_arr[SKARR_SZ];
+ int idx, accum, res;
+
+ if (hlist_nulls_empty(&head->chain))
+ continue;
+
+ if (i > s_i)
+ s_num = 0;
+
+next_chunk:
+ num = 0;
+ accum = 0;
+ spin_lock_bh(lock);
+ sk_nulls_for_each(sk, node, &head->chain) {
+ int state;
+
+ if (!net_eq(sock_net(sk), net))
+ continue;
+ if (num < s_num)
+ goto next_normal;
+ state = (sk->sk_state == TCP_TIME_WAIT) ?
+ inet_twsk(sk)->tw_substate : sk->sk_state;
+ if (!(idiag_states & (1 << state)))
+ goto next_normal;
+ if (r->sdiag_family != AF_UNSPEC &&
+ sk->sk_family != r->sdiag_family)
+ goto next_normal;
+ if (r->id.idiag_sport != htons(sk->sk_num) &&
+ r->id.idiag_sport)
+ goto next_normal;
+ if (r->id.idiag_dport != sk->sk_dport &&
+ r->id.idiag_dport)
+ goto next_normal;
+ twsk_build_assert();
+
+ if (!inet_diag_bc_sk(bc, sk))
+ goto next_normal;
+
+ sock_hold(sk);
+ num_arr[accum] = num;
+ sk_arr[accum] = sk;
+ if (++accum == SKARR_SZ)
+ break;
+next_normal:
+ ++num;
+ }
+ spin_unlock_bh(lock);
+ res = 0;
+ for (idx = 0; idx < accum; idx++) {
+ if (res >= 0) {
+ res = sk_diag_fill(sk_arr[idx], skb, r,
+ sk_user_ns(NETLINK_CB(cb->skb).sk),
+ NETLINK_CB(cb->skb).portid,
+ cb->nlh->nlmsg_seq, NLM_F_MULTI,
+ cb->nlh, net_admin);
+ if (res < 0)
+ num = num_arr[idx];
+ }
+ sock_gen_put(sk_arr[idx]);
+ }
+ if (res < 0)
+ break;
+ cond_resched();
+ if (accum == SKARR_SZ) {
+ s_num = num + 1;
+ goto next_chunk;
+ }
+ }
+
+done:
+ cb->args[1] = i;
+ cb->args[2] = num;
+out:
+ ;
+}
+EXPORT_SYMBOL_GPL(inet_diag_dump_icsk);
+
+static int __inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb,
+ const struct inet_diag_req_v2 *r,
+ struct nlattr *bc)
+{
+ const struct inet_diag_handler *handler;
+ int err = 0;
+
+ handler = inet_diag_lock_handler(r->sdiag_protocol);
+ if (!IS_ERR(handler))
+ handler->dump(skb, cb, r, bc);
+ else
+ err = PTR_ERR(handler);
+ inet_diag_unlock_handler(handler);
+
+ return err ? : skb->len;
+}
+
+static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
+{
+ int hdrlen = sizeof(struct inet_diag_req_v2);
+ struct nlattr *bc = NULL;
+
+ if (nlmsg_attrlen(cb->nlh, hdrlen))
+ bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
+
+ return __inet_diag_dump(skb, cb, nlmsg_data(cb->nlh), bc);
+}
+
+static int inet_diag_type2proto(int type)
+{
+ switch (type) {
+ case TCPDIAG_GETSOCK:
+ return IPPROTO_TCP;
+ case DCCPDIAG_GETSOCK:
+ return IPPROTO_DCCP;
+ default:
+ return 0;
+ }
+}
+
+static int inet_diag_dump_compat(struct sk_buff *skb,
+ struct netlink_callback *cb)
+{
+ struct inet_diag_req *rc = nlmsg_data(cb->nlh);
+ int hdrlen = sizeof(struct inet_diag_req);
+ struct inet_diag_req_v2 req;
+ struct nlattr *bc = NULL;
+
+ req.sdiag_family = AF_UNSPEC; /* compatibility */
+ req.sdiag_protocol = inet_diag_type2proto(cb->nlh->nlmsg_type);
+ req.idiag_ext = rc->idiag_ext;
+ req.idiag_states = rc->idiag_states;
+ req.id = rc->id;
+
+ if (nlmsg_attrlen(cb->nlh, hdrlen))
+ bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
+
+ return __inet_diag_dump(skb, cb, &req, bc);
+}
+
+static int inet_diag_get_exact_compat(struct sk_buff *in_skb,
+ const struct nlmsghdr *nlh)
+{
+ struct inet_diag_req *rc = nlmsg_data(nlh);
+ struct inet_diag_req_v2 req;
+
+ req.sdiag_family = rc->idiag_family;
+ req.sdiag_protocol = inet_diag_type2proto(nlh->nlmsg_type);
+ req.idiag_ext = rc->idiag_ext;
+ req.idiag_states = rc->idiag_states;
+ req.id = rc->id;
+
+ return inet_diag_cmd_exact(SOCK_DIAG_BY_FAMILY, in_skb, nlh, &req);
+}
+
+static int inet_diag_rcv_msg_compat(struct sk_buff *skb, struct nlmsghdr *nlh)
+{
+ int hdrlen = sizeof(struct inet_diag_req);
+ struct net *net = sock_net(skb->sk);
+
+ if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX ||
+ nlmsg_len(nlh) < hdrlen)
+ return -EINVAL;
+
+ if (nlh->nlmsg_flags & NLM_F_DUMP) {
+ if (nlmsg_attrlen(nlh, hdrlen)) {
+ struct nlattr *attr;
+ int err;
+
+ attr = nlmsg_find_attr(nlh, hdrlen,
+ INET_DIAG_REQ_BYTECODE);
+ err = inet_diag_bc_audit(attr, skb);
+ if (err)
+ return err;
+ }
+ {
+ struct netlink_dump_control c = {
+ .dump = inet_diag_dump_compat,
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, nlh, &c);
+ }
+ }
+
+ return inet_diag_get_exact_compat(skb, nlh);
+}
+
+static int inet_diag_handler_cmd(struct sk_buff *skb, struct nlmsghdr *h)
+{
+ int hdrlen = sizeof(struct inet_diag_req_v2);
+ struct net *net = sock_net(skb->sk);
+
+ if (nlmsg_len(h) < hdrlen)
+ return -EINVAL;
+
+ if (h->nlmsg_type == SOCK_DIAG_BY_FAMILY &&
+ h->nlmsg_flags & NLM_F_DUMP) {
+ if (nlmsg_attrlen(h, hdrlen)) {
+ struct nlattr *attr;
+ int err;
+
+ attr = nlmsg_find_attr(h, hdrlen,
+ INET_DIAG_REQ_BYTECODE);
+ err = inet_diag_bc_audit(attr, skb);
+ if (err)
+ return err;
+ }
+ {
+ struct netlink_dump_control c = {
+ .dump = inet_diag_dump,
+ };
+ return netlink_dump_start(net->diag_nlsk, skb, h, &c);
+ }
+ }
+
+ return inet_diag_cmd_exact(h->nlmsg_type, skb, h, nlmsg_data(h));
+}
+
+static
+int inet_diag_handler_get_info(struct sk_buff *skb, struct sock *sk)
+{
+ const struct inet_diag_handler *handler;
+ struct nlmsghdr *nlh;
+ struct nlattr *attr;
+ struct inet_diag_msg *r;
+ void *info = NULL;
+ int err = 0;
+
+ nlh = nlmsg_put(skb, 0, 0, SOCK_DIAG_BY_FAMILY, sizeof(*r), 0);
+ if (!nlh)
+ return -ENOMEM;
+
+ r = nlmsg_data(nlh);
+ memset(r, 0, sizeof(*r));
+ inet_diag_msg_common_fill(r, sk);
+ if (sk->sk_type == SOCK_DGRAM || sk->sk_type == SOCK_STREAM)
+ r->id.idiag_sport = inet_sk(sk)->inet_sport;
+ r->idiag_state = sk->sk_state;
+
+ if ((err = nla_put_u8(skb, INET_DIAG_PROTOCOL, sk->sk_protocol))) {
+ nlmsg_cancel(skb, nlh);
+ return err;
+ }
+
+ handler = inet_diag_lock_handler(sk->sk_protocol);
+ if (IS_ERR(handler)) {
+ inet_diag_unlock_handler(handler);
+ nlmsg_cancel(skb, nlh);
+ return PTR_ERR(handler);
+ }
+
+ attr = handler->idiag_info_size
+ ? nla_reserve_64bit(skb, INET_DIAG_INFO,
+ handler->idiag_info_size,
+ INET_DIAG_PAD)
+ : NULL;
+ if (attr)
+ info = nla_data(attr);
+
+ handler->idiag_get_info(sk, r, info);
+ inet_diag_unlock_handler(handler);
+
+ nlmsg_end(skb, nlh);
+ return 0;
+}
+
+static const struct sock_diag_handler inet_diag_handler = {
+ .family = AF_INET,
+ .dump = inet_diag_handler_cmd,
+ .get_info = inet_diag_handler_get_info,
+ .destroy = inet_diag_handler_cmd,
+};
+
+static const struct sock_diag_handler inet6_diag_handler = {
+ .family = AF_INET6,
+ .dump = inet_diag_handler_cmd,
+ .get_info = inet_diag_handler_get_info,
+ .destroy = inet_diag_handler_cmd,
+};
+
+int inet_diag_register(const struct inet_diag_handler *h)
+{
+ const __u16 type = h->idiag_type;
+ int err = -EINVAL;
+
+ if (type >= IPPROTO_MAX)
+ goto out;
+
+ mutex_lock(&inet_diag_table_mutex);
+ err = -EEXIST;
+ if (!inet_diag_table[type]) {
+ inet_diag_table[type] = h;
+ err = 0;
+ }
+ mutex_unlock(&inet_diag_table_mutex);
+out:
+ return err;
+}
+EXPORT_SYMBOL_GPL(inet_diag_register);
+
+void inet_diag_unregister(const struct inet_diag_handler *h)
+{
+ const __u16 type = h->idiag_type;
+
+ if (type >= IPPROTO_MAX)
+ return;
+
+ mutex_lock(&inet_diag_table_mutex);
+ inet_diag_table[type] = NULL;
+ mutex_unlock(&inet_diag_table_mutex);
+}
+EXPORT_SYMBOL_GPL(inet_diag_unregister);
+
+static int __init inet_diag_init(void)
+{
+ const int inet_diag_table_size = (IPPROTO_MAX *
+ sizeof(struct inet_diag_handler *));
+ int err = -ENOMEM;
+
+ inet_diag_table = kzalloc(inet_diag_table_size, GFP_KERNEL);
+ if (!inet_diag_table)
+ goto out;
+
+ err = sock_diag_register(&inet_diag_handler);
+ if (err)
+ goto out_free_nl;
+
+ err = sock_diag_register(&inet6_diag_handler);
+ if (err)
+ goto out_free_inet;
+
+ sock_diag_register_inet_compat(inet_diag_rcv_msg_compat);
+out:
+ return err;
+
+out_free_inet:
+ sock_diag_unregister(&inet_diag_handler);
+out_free_nl:
+ kfree(inet_diag_table);
+ goto out;
+}
+
+static void __exit inet_diag_exit(void)
+{
+ sock_diag_unregister(&inet6_diag_handler);
+ sock_diag_unregister(&inet_diag_handler);
+ sock_diag_unregister_inet_compat(inet_diag_rcv_msg_compat);
+ kfree(inet_diag_table);
+}
+
+module_init(inet_diag_init);
+module_exit(inet_diag_exit);
+MODULE_LICENSE("GPL");
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 2 /* AF_INET */);
+MODULE_ALIAS_NET_PF_PROTO_TYPE(PF_NETLINK, NETLINK_SOCK_DIAG, 10 /* AF_INET6 */);