![Pavel Emelyanov](/assets/img/avatar_default.png)
Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
1081 lines
26 KiB
C
1081 lines
26 KiB
C
/*
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* inet_diag.c Module for monitoring INET transport protocols sockets.
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*
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* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/fcntl.h>
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#include <linux/random.h>
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#include <linux/slab.h>
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#include <linux/cache.h>
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#include <linux/init.h>
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#include <linux/time.h>
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#include <net/icmp.h>
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#include <net/tcp.h>
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#include <net/ipv6.h>
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#include <net/inet_common.h>
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#include <net/inet_connection_sock.h>
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#include <net/inet_hashtables.h>
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#include <net/inet_timewait_sock.h>
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#include <net/inet6_hashtables.h>
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#include <net/netlink.h>
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#include <linux/inet.h>
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#include <linux/stddef.h>
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#include <linux/inet_diag.h>
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#include <linux/sock_diag.h>
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static const struct inet_diag_handler **inet_diag_table;
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struct inet_diag_entry {
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__be32 *saddr;
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__be32 *daddr;
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u16 sport;
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u16 dport;
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u16 family;
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u16 userlocks;
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};
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#define INET_DIAG_PUT(skb, attrtype, attrlen) \
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RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
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static DEFINE_MUTEX(inet_diag_table_mutex);
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static const struct inet_diag_handler *inet_diag_lock_handler(int proto)
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{
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if (!inet_diag_table[proto])
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request_module("net-pf-%d-proto-%d-type-%d-%d", PF_NETLINK,
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NETLINK_SOCK_DIAG, AF_INET, proto);
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mutex_lock(&inet_diag_table_mutex);
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if (!inet_diag_table[proto])
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return ERR_PTR(-ENOENT);
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return inet_diag_table[proto];
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}
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static inline void inet_diag_unlock_handler(
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const struct inet_diag_handler *handler)
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{
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mutex_unlock(&inet_diag_table_mutex);
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}
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int inet_sk_diag_fill(struct sock *sk, struct inet_connection_sock *icsk,
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struct sk_buff *skb, struct inet_diag_req *req,
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u32 pid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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const struct inet_sock *inet = inet_sk(sk);
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struct inet_diag_msg *r;
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struct nlmsghdr *nlh;
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void *info = NULL;
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struct inet_diag_meminfo *minfo = NULL;
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unsigned char *b = skb_tail_pointer(skb);
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const struct inet_diag_handler *handler;
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int ext = req->idiag_ext;
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handler = inet_diag_table[req->sdiag_protocol];
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BUG_ON(handler == NULL);
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nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
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nlh->nlmsg_flags = nlmsg_flags;
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r = NLMSG_DATA(nlh);
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BUG_ON(sk->sk_state == TCP_TIME_WAIT);
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if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
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minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
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r->idiag_family = sk->sk_family;
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r->idiag_state = sk->sk_state;
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r->idiag_timer = 0;
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r->idiag_retrans = 0;
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r->id.idiag_if = sk->sk_bound_dev_if;
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sock_diag_save_cookie(sk, r->id.idiag_cookie);
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r->id.idiag_sport = inet->inet_sport;
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r->id.idiag_dport = inet->inet_dport;
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r->id.idiag_src[0] = inet->inet_rcv_saddr;
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r->id.idiag_dst[0] = inet->inet_daddr;
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/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
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* hence this needs to be included regardless of socket family.
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*/
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if (ext & (1 << (INET_DIAG_TOS - 1)))
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RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
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#if IS_ENABLED(CONFIG_IPV6)
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if (r->idiag_family == AF_INET6) {
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const struct ipv6_pinfo *np = inet6_sk(sk);
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*(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = np->daddr;
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if (ext & (1 << (INET_DIAG_TCLASS - 1)))
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RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
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}
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#endif
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r->idiag_uid = sock_i_uid(sk);
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r->idiag_inode = sock_i_ino(sk);
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if (minfo) {
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minfo->idiag_rmem = sk_rmem_alloc_get(sk);
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minfo->idiag_wmem = sk->sk_wmem_queued;
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minfo->idiag_fmem = sk->sk_forward_alloc;
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minfo->idiag_tmem = sk_wmem_alloc_get(sk);
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}
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if (ext & (1 << (INET_DIAG_SKMEMINFO - 1)))
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if (sock_diag_put_meminfo(sk, skb, INET_DIAG_SKMEMINFO))
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goto rtattr_failure;
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if (icsk == NULL) {
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r->idiag_rqueue = r->idiag_wqueue = 0;
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goto out;
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}
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#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
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if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
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r->idiag_timer = 1;
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r->idiag_retrans = icsk->icsk_retransmits;
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r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
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} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
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r->idiag_timer = 4;
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r->idiag_retrans = icsk->icsk_probes_out;
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r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
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} else if (timer_pending(&sk->sk_timer)) {
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r->idiag_timer = 2;
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r->idiag_retrans = icsk->icsk_probes_out;
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r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
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} else {
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r->idiag_timer = 0;
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r->idiag_expires = 0;
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}
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#undef EXPIRES_IN_MS
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if (ext & (1 << (INET_DIAG_INFO - 1)))
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info = INET_DIAG_PUT(skb, INET_DIAG_INFO, sizeof(struct tcp_info));
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if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
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const size_t len = strlen(icsk->icsk_ca_ops->name);
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strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
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icsk->icsk_ca_ops->name);
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}
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handler->idiag_get_info(sk, r, info);
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if (sk->sk_state < TCP_TIME_WAIT &&
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icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
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icsk->icsk_ca_ops->get_info(sk, ext, skb);
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out:
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nlh->nlmsg_len = skb_tail_pointer(skb) - b;
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return skb->len;
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rtattr_failure:
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nlmsg_failure:
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nlmsg_trim(skb, b);
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return -EMSGSIZE;
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}
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EXPORT_SYMBOL_GPL(inet_sk_diag_fill);
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static int inet_csk_diag_fill(struct sock *sk,
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struct sk_buff *skb, struct inet_diag_req *req,
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u32 pid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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return inet_sk_diag_fill(sk, inet_csk(sk),
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skb, req, pid, seq, nlmsg_flags, unlh);
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}
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static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
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struct sk_buff *skb, struct inet_diag_req *req,
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u32 pid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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long tmo;
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struct inet_diag_msg *r;
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const unsigned char *previous_tail = skb_tail_pointer(skb);
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struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
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unlh->nlmsg_type, sizeof(*r));
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r = NLMSG_DATA(nlh);
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BUG_ON(tw->tw_state != TCP_TIME_WAIT);
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nlh->nlmsg_flags = nlmsg_flags;
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tmo = tw->tw_ttd - jiffies;
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if (tmo < 0)
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tmo = 0;
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r->idiag_family = tw->tw_family;
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r->idiag_retrans = 0;
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r->id.idiag_if = tw->tw_bound_dev_if;
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sock_diag_save_cookie(tw, r->id.idiag_cookie);
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r->id.idiag_sport = tw->tw_sport;
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r->id.idiag_dport = tw->tw_dport;
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r->id.idiag_src[0] = tw->tw_rcv_saddr;
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r->id.idiag_dst[0] = tw->tw_daddr;
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r->idiag_state = tw->tw_substate;
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r->idiag_timer = 3;
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r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
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r->idiag_rqueue = 0;
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r->idiag_wqueue = 0;
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r->idiag_uid = 0;
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r->idiag_inode = 0;
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#if IS_ENABLED(CONFIG_IPV6)
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if (tw->tw_family == AF_INET6) {
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const struct inet6_timewait_sock *tw6 =
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inet6_twsk((struct sock *)tw);
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*(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
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*(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
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}
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#endif
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nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
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return skb->len;
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nlmsg_failure:
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nlmsg_trim(skb, previous_tail);
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return -EMSGSIZE;
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}
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
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struct inet_diag_req *r, u32 pid, u32 seq, u16 nlmsg_flags,
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const struct nlmsghdr *unlh)
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{
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if (sk->sk_state == TCP_TIME_WAIT)
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return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
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skb, r, pid, seq, nlmsg_flags,
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unlh);
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return inet_csk_diag_fill(sk, skb, r, pid, seq, nlmsg_flags, unlh);
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}
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int inet_diag_dump_one_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *in_skb,
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const struct nlmsghdr *nlh, struct inet_diag_req *req)
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{
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int err;
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struct sock *sk;
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struct sk_buff *rep;
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err = -EINVAL;
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if (req->sdiag_family == AF_INET) {
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sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
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req->id.idiag_dport, req->id.idiag_src[0],
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req->id.idiag_sport, req->id.idiag_if);
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}
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#if IS_ENABLED(CONFIG_IPV6)
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else if (req->sdiag_family == AF_INET6) {
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sk = inet6_lookup(&init_net, hashinfo,
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(struct in6_addr *)req->id.idiag_dst,
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req->id.idiag_dport,
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(struct in6_addr *)req->id.idiag_src,
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req->id.idiag_sport,
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req->id.idiag_if);
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}
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#endif
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else {
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goto out_nosk;
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}
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err = -ENOENT;
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if (sk == NULL)
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goto out_nosk;
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err = sock_diag_check_cookie(sk, req->id.idiag_cookie);
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if (err)
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goto out;
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err = -ENOMEM;
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rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
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sizeof(struct inet_diag_meminfo) +
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sizeof(struct tcp_info) + 64)),
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GFP_KERNEL);
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if (!rep)
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goto out;
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err = sk_diag_fill(sk, rep, req,
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NETLINK_CB(in_skb).pid,
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nlh->nlmsg_seq, 0, nlh);
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if (err < 0) {
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WARN_ON(err == -EMSGSIZE);
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kfree_skb(rep);
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goto out;
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}
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err = netlink_unicast(sock_diag_nlsk, rep, NETLINK_CB(in_skb).pid,
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MSG_DONTWAIT);
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if (err > 0)
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err = 0;
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out:
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if (sk) {
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if (sk->sk_state == TCP_TIME_WAIT)
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inet_twsk_put((struct inet_timewait_sock *)sk);
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else
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sock_put(sk);
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}
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out_nosk:
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return err;
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}
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EXPORT_SYMBOL_GPL(inet_diag_dump_one_icsk);
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static int inet_diag_get_exact(struct sk_buff *in_skb,
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const struct nlmsghdr *nlh,
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struct inet_diag_req *req)
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{
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const struct inet_diag_handler *handler;
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int err;
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handler = inet_diag_lock_handler(req->sdiag_protocol);
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if (IS_ERR(handler))
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err = PTR_ERR(handler);
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else
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err = handler->dump_one(in_skb, nlh, req);
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inet_diag_unlock_handler(handler);
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return err;
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}
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static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
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{
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int words = bits >> 5;
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bits &= 0x1f;
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if (words) {
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if (memcmp(a1, a2, words << 2))
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return 0;
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}
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if (bits) {
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__be32 w1, w2;
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__be32 mask;
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w1 = a1[words];
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w2 = a2[words];
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mask = htonl((0xffffffff) << (32 - bits));
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if ((w1 ^ w2) & mask)
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return 0;
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}
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return 1;
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}
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static int inet_diag_bc_run(const struct nlattr *_bc,
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const struct inet_diag_entry *entry)
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{
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const void *bc = nla_data(_bc);
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int len = nla_len(_bc);
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while (len > 0) {
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int yes = 1;
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const struct inet_diag_bc_op *op = bc;
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switch (op->code) {
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case INET_DIAG_BC_NOP:
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break;
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case INET_DIAG_BC_JMP:
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yes = 0;
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break;
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case INET_DIAG_BC_S_GE:
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yes = entry->sport >= op[1].no;
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break;
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case INET_DIAG_BC_S_LE:
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yes = entry->sport <= op[1].no;
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break;
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case INET_DIAG_BC_D_GE:
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yes = entry->dport >= op[1].no;
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break;
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case INET_DIAG_BC_D_LE:
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yes = entry->dport <= op[1].no;
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break;
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case INET_DIAG_BC_AUTO:
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yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
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break;
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case INET_DIAG_BC_S_COND:
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case INET_DIAG_BC_D_COND: {
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struct inet_diag_hostcond *cond;
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__be32 *addr;
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cond = (struct inet_diag_hostcond *)(op + 1);
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if (cond->port != -1 &&
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cond->port != (op->code == INET_DIAG_BC_S_COND ?
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entry->sport : entry->dport)) {
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yes = 0;
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break;
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}
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if (cond->prefix_len == 0)
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break;
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|
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if (op->code == INET_DIAG_BC_S_COND)
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addr = entry->saddr;
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else
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addr = entry->daddr;
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if (bitstring_match(addr, cond->addr,
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cond->prefix_len))
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break;
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if (entry->family == AF_INET6 &&
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cond->family == AF_INET) {
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if (addr[0] == 0 && addr[1] == 0 &&
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addr[2] == htonl(0xffff) &&
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bitstring_match(addr + 3, cond->addr,
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cond->prefix_len))
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break;
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}
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yes = 0;
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break;
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}
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}
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if (yes) {
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len -= op->yes;
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bc += op->yes;
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} else {
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len -= op->no;
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bc += op->no;
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}
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}
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return len == 0;
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}
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|
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int inet_diag_bc_sk(const struct nlattr *bc, struct sock *sk)
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{
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struct inet_diag_entry entry;
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struct inet_sock *inet = inet_sk(sk);
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if (bc == NULL)
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return 1;
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entry.family = sk->sk_family;
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#if IS_ENABLED(CONFIG_IPV6)
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if (entry.family == AF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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entry.saddr = np->rcv_saddr.s6_addr32;
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entry.daddr = np->daddr.s6_addr32;
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} else
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#endif
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{
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entry.saddr = &inet->inet_rcv_saddr;
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entry.daddr = &inet->inet_daddr;
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}
|
|
entry.sport = inet->inet_num;
|
|
entry.dport = ntohs(inet->inet_dport);
|
|
entry.userlocks = sk->sk_userlocks;
|
|
|
|
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;
|
|
}
|
|
|
|
static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
|
|
{
|
|
const void *bc = bytecode;
|
|
int len = bytecode_len;
|
|
|
|
while (len > 0) {
|
|
const struct inet_diag_bc_op *op = bc;
|
|
|
|
//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
|
|
switch (op->code) {
|
|
case INET_DIAG_BC_AUTO:
|
|
case INET_DIAG_BC_S_COND:
|
|
case INET_DIAG_BC_D_COND:
|
|
case INET_DIAG_BC_S_GE:
|
|
case INET_DIAG_BC_S_LE:
|
|
case INET_DIAG_BC_D_GE:
|
|
case INET_DIAG_BC_D_LE:
|
|
case INET_DIAG_BC_JMP:
|
|
if (op->no < 4 || op->no > len + 4 || op->no & 3)
|
|
return -EINVAL;
|
|
if (op->no < len &&
|
|
!valid_cc(bytecode, bytecode_len, len - op->no))
|
|
return -EINVAL;
|
|
break;
|
|
case INET_DIAG_BC_NOP:
|
|
break;
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
if (op->yes < 4 || 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,
|
|
struct inet_diag_req *r,
|
|
const struct nlattr *bc)
|
|
{
|
|
if (!inet_diag_bc_sk(bc, sk))
|
|
return 0;
|
|
|
|
return inet_csk_diag_fill(sk, skb, r,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
|
|
}
|
|
|
|
static int inet_twsk_diag_dump(struct inet_timewait_sock *tw,
|
|
struct sk_buff *skb,
|
|
struct netlink_callback *cb,
|
|
struct inet_diag_req *r,
|
|
const struct nlattr *bc)
|
|
{
|
|
if (bc != NULL) {
|
|
struct inet_diag_entry entry;
|
|
|
|
entry.family = tw->tw_family;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (tw->tw_family == AF_INET6) {
|
|
struct inet6_timewait_sock *tw6 =
|
|
inet6_twsk((struct sock *)tw);
|
|
entry.saddr = tw6->tw_v6_rcv_saddr.s6_addr32;
|
|
entry.daddr = tw6->tw_v6_daddr.s6_addr32;
|
|
} else
|
|
#endif
|
|
{
|
|
entry.saddr = &tw->tw_rcv_saddr;
|
|
entry.daddr = &tw->tw_daddr;
|
|
}
|
|
entry.sport = tw->tw_num;
|
|
entry.dport = ntohs(tw->tw_dport);
|
|
entry.userlocks = 0;
|
|
|
|
if (!inet_diag_bc_run(bc, &entry))
|
|
return 0;
|
|
}
|
|
|
|
return inet_twsk_diag_fill(tw, skb, r,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, NLM_F_MULTI, cb->nlh);
|
|
}
|
|
|
|
static int inet_diag_fill_req(struct sk_buff *skb, struct sock *sk,
|
|
struct request_sock *req, u32 pid, u32 seq,
|
|
const struct nlmsghdr *unlh)
|
|
{
|
|
const struct inet_request_sock *ireq = inet_rsk(req);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
struct inet_diag_msg *r;
|
|
struct nlmsghdr *nlh;
|
|
long tmo;
|
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
|
|
nlh->nlmsg_flags = NLM_F_MULTI;
|
|
r = NLMSG_DATA(nlh);
|
|
|
|
r->idiag_family = sk->sk_family;
|
|
r->idiag_state = TCP_SYN_RECV;
|
|
r->idiag_timer = 1;
|
|
r->idiag_retrans = req->retrans;
|
|
|
|
r->id.idiag_if = sk->sk_bound_dev_if;
|
|
sock_diag_save_cookie(req, r->id.idiag_cookie);
|
|
|
|
tmo = req->expires - jiffies;
|
|
if (tmo < 0)
|
|
tmo = 0;
|
|
|
|
r->id.idiag_sport = inet->inet_sport;
|
|
r->id.idiag_dport = ireq->rmt_port;
|
|
r->id.idiag_src[0] = ireq->loc_addr;
|
|
r->id.idiag_dst[0] = ireq->rmt_addr;
|
|
r->idiag_expires = jiffies_to_msecs(tmo);
|
|
r->idiag_rqueue = 0;
|
|
r->idiag_wqueue = 0;
|
|
r->idiag_uid = sock_i_uid(sk);
|
|
r->idiag_inode = 0;
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
if (r->idiag_family == AF_INET6) {
|
|
*(struct in6_addr *)r->id.idiag_src = inet6_rsk(req)->loc_addr;
|
|
*(struct in6_addr *)r->id.idiag_dst = inet6_rsk(req)->rmt_addr;
|
|
}
|
|
#endif
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -1;
|
|
}
|
|
|
|
static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
|
|
struct netlink_callback *cb,
|
|
struct inet_diag_req *r,
|
|
const struct nlattr *bc)
|
|
{
|
|
struct inet_diag_entry entry;
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct listen_sock *lopt;
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
int j, s_j;
|
|
int reqnum, s_reqnum;
|
|
int err = 0;
|
|
|
|
s_j = cb->args[3];
|
|
s_reqnum = cb->args[4];
|
|
|
|
if (s_j > 0)
|
|
s_j--;
|
|
|
|
entry.family = sk->sk_family;
|
|
|
|
read_lock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
|
|
|
|
lopt = icsk->icsk_accept_queue.listen_opt;
|
|
if (!lopt || !lopt->qlen)
|
|
goto out;
|
|
|
|
if (bc != NULL) {
|
|
entry.sport = inet->inet_num;
|
|
entry.userlocks = sk->sk_userlocks;
|
|
}
|
|
|
|
for (j = s_j; j < lopt->nr_table_entries; j++) {
|
|
struct request_sock *req, *head = lopt->syn_table[j];
|
|
|
|
reqnum = 0;
|
|
for (req = head; req; reqnum++, req = req->dl_next) {
|
|
struct inet_request_sock *ireq = inet_rsk(req);
|
|
|
|
if (reqnum < s_reqnum)
|
|
continue;
|
|
if (r->id.idiag_dport != ireq->rmt_port &&
|
|
r->id.idiag_dport)
|
|
continue;
|
|
|
|
if (bc) {
|
|
entry.saddr =
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
(entry.family == AF_INET6) ?
|
|
inet6_rsk(req)->loc_addr.s6_addr32 :
|
|
#endif
|
|
&ireq->loc_addr;
|
|
entry.daddr =
|
|
#if IS_ENABLED(CONFIG_IPV6)
|
|
(entry.family == AF_INET6) ?
|
|
inet6_rsk(req)->rmt_addr.s6_addr32 :
|
|
#endif
|
|
&ireq->rmt_addr;
|
|
entry.dport = ntohs(ireq->rmt_port);
|
|
|
|
if (!inet_diag_bc_run(bc, &entry))
|
|
continue;
|
|
}
|
|
|
|
err = inet_diag_fill_req(skb, sk, req,
|
|
NETLINK_CB(cb->skb).pid,
|
|
cb->nlh->nlmsg_seq, cb->nlh);
|
|
if (err < 0) {
|
|
cb->args[3] = j + 1;
|
|
cb->args[4] = reqnum;
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
s_reqnum = 0;
|
|
}
|
|
|
|
out:
|
|
read_unlock_bh(&icsk->icsk_accept_queue.syn_wait_lock);
|
|
|
|
return err;
|
|
}
|
|
|
|
void inet_diag_dump_icsk(struct inet_hashinfo *hashinfo, struct sk_buff *skb,
|
|
struct netlink_callback *cb, struct inet_diag_req *r, struct nlattr *bc)
|
|
{
|
|
int i, num;
|
|
int s_i, s_num;
|
|
|
|
s_i = cb->args[1];
|
|
s_num = num = cb->args[2];
|
|
|
|
if (cb->args[0] == 0) {
|
|
if (!(r->idiag_states & (TCPF_LISTEN | TCPF_SYN_RECV)))
|
|
goto skip_listen_ht;
|
|
|
|
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
|
|
struct sock *sk;
|
|
struct hlist_nulls_node *node;
|
|
struct inet_listen_hashbucket *ilb;
|
|
|
|
num = 0;
|
|
ilb = &hashinfo->listening_hash[i];
|
|
spin_lock_bh(&ilb->lock);
|
|
sk_nulls_for_each(sk, node, &ilb->head) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
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 (!(r->idiag_states & TCPF_LISTEN) ||
|
|
r->id.idiag_dport ||
|
|
cb->args[3] > 0)
|
|
goto syn_recv;
|
|
|
|
if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
|
|
spin_unlock_bh(&ilb->lock);
|
|
goto done;
|
|
}
|
|
|
|
syn_recv:
|
|
if (!(r->idiag_states & TCPF_SYN_RECV))
|
|
goto next_listen;
|
|
|
|
if (inet_diag_dump_reqs(skb, sk, cb, r, bc) < 0) {
|
|
spin_unlock_bh(&ilb->lock);
|
|
goto done;
|
|
}
|
|
|
|
next_listen:
|
|
cb->args[3] = 0;
|
|
cb->args[4] = 0;
|
|
++num;
|
|
}
|
|
spin_unlock_bh(&ilb->lock);
|
|
|
|
s_num = 0;
|
|
cb->args[3] = 0;
|
|
cb->args[4] = 0;
|
|
}
|
|
skip_listen_ht:
|
|
cb->args[0] = 1;
|
|
s_i = num = s_num = 0;
|
|
}
|
|
|
|
if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
|
|
goto out;
|
|
|
|
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 sock *sk;
|
|
struct hlist_nulls_node *node;
|
|
|
|
num = 0;
|
|
|
|
if (hlist_nulls_empty(&head->chain) &&
|
|
hlist_nulls_empty(&head->twchain))
|
|
continue;
|
|
|
|
if (i > s_i)
|
|
s_num = 0;
|
|
|
|
spin_lock_bh(lock);
|
|
sk_nulls_for_each(sk, node, &head->chain) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (num < s_num)
|
|
goto next_normal;
|
|
if (!(r->idiag_states & (1 << sk->sk_state)))
|
|
goto next_normal;
|
|
if (r->sdiag_family != AF_UNSPEC &&
|
|
sk->sk_family != r->sdiag_family)
|
|
goto next_normal;
|
|
if (r->id.idiag_sport != inet->inet_sport &&
|
|
r->id.idiag_sport)
|
|
goto next_normal;
|
|
if (r->id.idiag_dport != inet->inet_dport &&
|
|
r->id.idiag_dport)
|
|
goto next_normal;
|
|
if (inet_csk_diag_dump(sk, skb, cb, r, bc) < 0) {
|
|
spin_unlock_bh(lock);
|
|
goto done;
|
|
}
|
|
next_normal:
|
|
++num;
|
|
}
|
|
|
|
if (r->idiag_states & TCPF_TIME_WAIT) {
|
|
struct inet_timewait_sock *tw;
|
|
|
|
inet_twsk_for_each(tw, node,
|
|
&head->twchain) {
|
|
|
|
if (num < s_num)
|
|
goto next_dying;
|
|
if (r->sdiag_family != AF_UNSPEC &&
|
|
tw->tw_family != r->sdiag_family)
|
|
goto next_dying;
|
|
if (r->id.idiag_sport != tw->tw_sport &&
|
|
r->id.idiag_sport)
|
|
goto next_dying;
|
|
if (r->id.idiag_dport != tw->tw_dport &&
|
|
r->id.idiag_dport)
|
|
goto next_dying;
|
|
if (inet_twsk_diag_dump(tw, skb, cb, r, bc) < 0) {
|
|
spin_unlock_bh(lock);
|
|
goto done;
|
|
}
|
|
next_dying:
|
|
++num;
|
|
}
|
|
}
|
|
spin_unlock_bh(lock);
|
|
}
|
|
|
|
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,
|
|
struct inet_diag_req *r, struct nlattr *bc)
|
|
{
|
|
const struct inet_diag_handler *handler;
|
|
|
|
handler = inet_diag_lock_handler(r->sdiag_protocol);
|
|
if (!IS_ERR(handler))
|
|
handler->dump(skb, cb, r, bc);
|
|
inet_diag_unlock_handler(handler);
|
|
|
|
return skb->len;
|
|
}
|
|
|
|
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
struct nlattr *bc = NULL;
|
|
int hdrlen = sizeof(struct inet_diag_req);
|
|
|
|
if (nlmsg_attrlen(cb->nlh, hdrlen))
|
|
bc = nlmsg_find_attr(cb->nlh, hdrlen, INET_DIAG_REQ_BYTECODE);
|
|
|
|
return __inet_diag_dump(skb, cb, (struct inet_diag_req *)NLMSG_DATA(cb->nlh), bc);
|
|
}
|
|
|
|
static inline 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_compat *rc = NLMSG_DATA(cb->nlh);
|
|
struct inet_diag_req req;
|
|
struct nlattr *bc = NULL;
|
|
int hdrlen = sizeof(struct inet_diag_req_compat);
|
|
|
|
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_compat *rc = NLMSG_DATA(nlh);
|
|
struct inet_diag_req 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_get_exact(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_compat);
|
|
|
|
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;
|
|
|
|
attr = nlmsg_find_attr(nlh, hdrlen,
|
|
INET_DIAG_REQ_BYTECODE);
|
|
if (attr == NULL ||
|
|
nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
|
|
inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return netlink_dump_start(sock_diag_nlsk, skb, nlh,
|
|
inet_diag_dump_compat, NULL, 0);
|
|
}
|
|
|
|
return inet_diag_get_exact_compat(skb, nlh);
|
|
}
|
|
|
|
static int inet_diag_handler_dump(struct sk_buff *skb, struct nlmsghdr *h)
|
|
{
|
|
int hdrlen = sizeof(struct inet_diag_req);
|
|
|
|
if (nlmsg_len(h) < hdrlen)
|
|
return -EINVAL;
|
|
|
|
if (h->nlmsg_flags & NLM_F_DUMP) {
|
|
if (nlmsg_attrlen(h, hdrlen)) {
|
|
struct nlattr *attr;
|
|
attr = nlmsg_find_attr(h, hdrlen,
|
|
INET_DIAG_REQ_BYTECODE);
|
|
if (attr == NULL ||
|
|
nla_len(attr) < sizeof(struct inet_diag_bc_op) ||
|
|
inet_diag_bc_audit(nla_data(attr), nla_len(attr)))
|
|
return -EINVAL;
|
|
}
|
|
|
|
return netlink_dump_start(sock_diag_nlsk, skb, h,
|
|
inet_diag_dump, NULL, 0);
|
|
}
|
|
|
|
return inet_diag_get_exact(skb, h, (struct inet_diag_req *)NLMSG_DATA(h));
|
|
}
|
|
|
|
static struct sock_diag_handler inet_diag_handler = {
|
|
.family = AF_INET,
|
|
.dump = inet_diag_handler_dump,
|
|
};
|
|
|
|
static struct sock_diag_handler inet6_diag_handler = {
|
|
.family = AF_INET6,
|
|
.dump = inet_diag_handler_dump,
|
|
};
|
|
|
|
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] == NULL) {
|
|
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 */);
|