937 lines
22 KiB
C
937 lines
22 KiB
C
/*
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* inet_diag.c Module for monitoring INET transport protocols sockets.
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*
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* Version: $Id: inet_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
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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/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/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 <linux/inet.h>
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#include <linux/stddef.h>
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#include <linux/inet_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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u32 *saddr;
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u32 *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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static struct sock *idiagnl;
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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 int inet_csk_diag_fill(struct sock *sk,
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struct sk_buff *skb,
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int ext, 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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const struct inet_connection_sock *icsk = inet_csk(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;
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const struct inet_diag_handler *handler;
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handler = inet_diag_table[unlh->nlmsg_type];
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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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if (ext & (1 << (INET_DIAG_INFO - 1)))
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info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
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handler->idiag_info_size);
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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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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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r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
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r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
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r->id.idiag_sport = inet->sport;
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r->id.idiag_dport = inet->dport;
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r->id.idiag_src[0] = inet->rcv_saddr;
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r->id.idiag_dst[0] = inet->daddr;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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if (r->idiag_family == AF_INET6) {
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struct ipv6_pinfo *np = inet6_sk(sk);
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ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
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&np->rcv_saddr);
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ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
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&np->daddr);
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}
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#endif
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#define EXPIRES_IN_MS(tmo) ((tmo - jiffies) * 1000 + HZ - 1) / 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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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 = atomic_read(&sk->sk_rmem_alloc);
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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 = atomic_read(&sk->sk_wmem_alloc);
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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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nlh->nlmsg_len = skb->tail - b;
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return skb->len;
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rtattr_failure:
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nlmsg_failure:
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skb_trim(skb, b - skb->data);
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return -1;
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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, int ext, u32 pid,
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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;
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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_state = tw->tw_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 = tw->tw_bound_dev_if;
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r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
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r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
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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 = (tmo * 1000 + HZ - 1) / 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 defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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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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ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
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&tw6->tw_v6_rcv_saddr);
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ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
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&tw6->tw_v6_daddr);
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}
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#endif
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nlh->nlmsg_len = skb->tail - previous_tail;
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return skb->len;
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nlmsg_failure:
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skb_trim(skb, previous_tail - skb->data);
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return -1;
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}
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static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
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int ext, 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, ext, pid, seq, nlmsg_flags,
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unlh);
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return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
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}
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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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{
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int err;
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struct sock *sk;
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struct inet_diag_req *req = NLMSG_DATA(nlh);
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struct sk_buff *rep;
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struct inet_hashinfo *hashinfo;
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const struct inet_diag_handler *handler;
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handler = inet_diag_table[nlh->nlmsg_type];
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BUG_ON(handler == NULL);
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hashinfo = handler->idiag_hashinfo;
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if (req->idiag_family == AF_INET) {
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sk = inet_lookup(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 defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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else if (req->idiag_family == AF_INET6) {
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sk = inet6_lookup(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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return -EINVAL;
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}
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if (sk == NULL)
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return -ENOENT;
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err = -ESTALE;
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if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
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req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
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((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
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(u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
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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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handler->idiag_info_size + 64)),
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GFP_KERNEL);
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if (!rep)
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goto out;
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if (sk_diag_fill(sk, rep, req->idiag_ext,
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NETLINK_CB(in_skb).pid,
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nlh->nlmsg_seq, 0, nlh) <= 0)
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BUG();
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err = netlink_unicast(idiagnl, 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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return err;
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}
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static int bitstring_match(const u32 *a1, const u32 *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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__u32 w1, w2;
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__u32 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 void *bc, int len,
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const struct inet_diag_entry *entry)
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{
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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->dport <= 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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u32 *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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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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static int valid_cc(const void *bc, int len, int cc)
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{
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while (len >= 0) {
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const struct inet_diag_bc_op *op = bc;
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if (cc > len)
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return 0;
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if (cc == len)
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return 1;
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if (op->yes < 4)
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return 0;
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len -= op->yes;
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bc += op->yes;
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}
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return 0;
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}
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static int inet_diag_bc_audit(const void *bytecode, int bytecode_len)
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{
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const unsigned char *bc = bytecode;
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int len = bytecode_len;
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while (len > 0) {
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struct inet_diag_bc_op *op = (struct inet_diag_bc_op *)bc;
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//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
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switch (op->code) {
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case INET_DIAG_BC_AUTO:
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case INET_DIAG_BC_S_COND:
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case INET_DIAG_BC_D_COND:
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case INET_DIAG_BC_S_GE:
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case INET_DIAG_BC_S_LE:
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case INET_DIAG_BC_D_GE:
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case INET_DIAG_BC_D_LE:
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if (op->yes < 4 || op->yes > len + 4)
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return -EINVAL;
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case INET_DIAG_BC_JMP:
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if (op->no < 4 || op->no > len + 4)
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return -EINVAL;
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if (op->no < len &&
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!valid_cc(bytecode, bytecode_len, len - op->no))
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return -EINVAL;
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break;
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case INET_DIAG_BC_NOP:
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if (op->yes < 4 || op->yes > len + 4)
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return -EINVAL;
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break;
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default:
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return -EINVAL;
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}
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bc += op->yes;
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len -= op->yes;
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}
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return len == 0 ? 0 : -EINVAL;
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}
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static int inet_csk_diag_dump(struct sock *sk,
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struct sk_buff *skb,
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struct netlink_callback *cb)
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{
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struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
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if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
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struct inet_diag_entry entry;
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struct rtattr *bc = (struct rtattr *)(r + 1);
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struct inet_sock *inet = inet_sk(sk);
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entry.family = sk->sk_family;
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#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
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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->rcv_saddr;
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entry.daddr = &inet->daddr;
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}
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|
entry.sport = inet->num;
|
|
entry.dport = ntohs(inet->dport);
|
|
entry.userlocks = sk->sk_userlocks;
|
|
|
|
if (!inet_diag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
|
|
return 0;
|
|
}
|
|
|
|
return inet_csk_diag_fill(sk, skb, r->idiag_ext,
|
|
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 = NLMSG_DATA(cb->nlh);
|
|
|
|
if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
|
|
struct inet_diag_entry entry;
|
|
struct rtattr *bc = (struct rtattr *)(r + 1);
|
|
|
|
entry.family = tw->tw_family;
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
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(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
|
|
return 0;
|
|
}
|
|
|
|
return inet_twsk_diag_fill(tw, skb, r->idiag_ext,
|
|
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;
|
|
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;
|
|
r->id.idiag_cookie[0] = (u32)(unsigned long)req;
|
|
r->id.idiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
|
|
|
|
tmo = req->expires - jiffies;
|
|
if (tmo < 0)
|
|
tmo = 0;
|
|
|
|
r->id.idiag_sport = 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 defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
if (r->idiag_family == AF_INET6) {
|
|
ipv6_addr_copy((struct in6_addr *)r->id.idiag_src,
|
|
&inet6_rsk(req)->loc_addr);
|
|
ipv6_addr_copy((struct in6_addr *)r->id.idiag_dst,
|
|
&inet6_rsk(req)->rmt_addr);
|
|
}
|
|
#endif
|
|
nlh->nlmsg_len = skb->tail - b;
|
|
|
|
return skb->len;
|
|
|
|
nlmsg_failure:
|
|
skb_trim(skb, b - skb->data);
|
|
return -1;
|
|
}
|
|
|
|
static int inet_diag_dump_reqs(struct sk_buff *skb, struct sock *sk,
|
|
struct netlink_callback *cb)
|
|
{
|
|
struct inet_diag_entry entry;
|
|
struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct listen_sock *lopt;
|
|
struct rtattr *bc = NULL;
|
|
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 (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
|
|
bc = (struct rtattr *)(r + 1);
|
|
entry.sport = 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 defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
(entry.family == AF_INET6) ?
|
|
inet6_rsk(req)->loc_addr.s6_addr32 :
|
|
#endif
|
|
&ireq->loc_addr;
|
|
entry.daddr =
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
(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(RTA_DATA(bc),
|
|
RTA_PAYLOAD(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;
|
|
}
|
|
|
|
static int inet_diag_dump(struct sk_buff *skb, struct netlink_callback *cb)
|
|
{
|
|
int i, num;
|
|
int s_i, s_num;
|
|
struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
|
|
const struct inet_diag_handler *handler;
|
|
struct inet_hashinfo *hashinfo;
|
|
|
|
handler = inet_diag_table[cb->nlh->nlmsg_type];
|
|
BUG_ON(handler == NULL);
|
|
hashinfo = handler->idiag_hashinfo;
|
|
|
|
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;
|
|
|
|
inet_listen_lock(hashinfo);
|
|
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
|
|
num = 0;
|
|
sk_for_each(sk, node, &hashinfo->listening_hash[i]) {
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
if (num < s_num) {
|
|
num++;
|
|
continue;
|
|
}
|
|
|
|
if (r->id.idiag_sport != 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) < 0) {
|
|
inet_listen_unlock(hashinfo);
|
|
goto done;
|
|
}
|
|
|
|
syn_recv:
|
|
if (!(r->idiag_states & TCPF_SYN_RECV))
|
|
goto next_listen;
|
|
|
|
if (inet_diag_dump_reqs(skb, sk, cb) < 0) {
|
|
inet_listen_unlock(hashinfo);
|
|
goto done;
|
|
}
|
|
|
|
next_listen:
|
|
cb->args[3] = 0;
|
|
cb->args[4] = 0;
|
|
++num;
|
|
}
|
|
|
|
s_num = 0;
|
|
cb->args[3] = 0;
|
|
cb->args[4] = 0;
|
|
}
|
|
inet_listen_unlock(hashinfo);
|
|
skip_listen_ht:
|
|
cb->args[0] = 1;
|
|
s_i = num = s_num = 0;
|
|
}
|
|
|
|
if (!(r->idiag_states & ~(TCPF_LISTEN | TCPF_SYN_RECV)))
|
|
return skb->len;
|
|
|
|
for (i = s_i; i < hashinfo->ehash_size; i++) {
|
|
struct inet_ehash_bucket *head = &hashinfo->ehash[i];
|
|
struct sock *sk;
|
|
struct hlist_node *node;
|
|
|
|
if (i > s_i)
|
|
s_num = 0;
|
|
|
|
read_lock_bh(&head->lock);
|
|
num = 0;
|
|
sk_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->id.idiag_sport != inet->sport &&
|
|
r->id.idiag_sport)
|
|
goto next_normal;
|
|
if (r->id.idiag_dport != inet->dport &&
|
|
r->id.idiag_dport)
|
|
goto next_normal;
|
|
if (inet_csk_diag_dump(sk, skb, cb) < 0) {
|
|
read_unlock_bh(&head->lock);
|
|
goto done;
|
|
}
|
|
next_normal:
|
|
++num;
|
|
}
|
|
|
|
if (r->idiag_states & TCPF_TIME_WAIT) {
|
|
struct inet_timewait_sock *tw;
|
|
|
|
inet_twsk_for_each(tw, node,
|
|
&hashinfo->ehash[i + hashinfo->ehash_size].chain) {
|
|
|
|
if (num < s_num)
|
|
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) < 0) {
|
|
read_unlock_bh(&head->lock);
|
|
goto done;
|
|
}
|
|
next_dying:
|
|
++num;
|
|
}
|
|
}
|
|
read_unlock_bh(&head->lock);
|
|
}
|
|
|
|
done:
|
|
cb->args[1] = i;
|
|
cb->args[2] = num;
|
|
return skb->len;
|
|
}
|
|
|
|
static inline int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
|
|
return 0;
|
|
|
|
if (nlh->nlmsg_type >= INET_DIAG_GETSOCK_MAX)
|
|
goto err_inval;
|
|
|
|
if (inet_diag_table[nlh->nlmsg_type] == NULL)
|
|
return -ENOENT;
|
|
|
|
if (NLMSG_LENGTH(sizeof(struct inet_diag_req)) > skb->len)
|
|
goto err_inval;
|
|
|
|
if (nlh->nlmsg_flags&NLM_F_DUMP) {
|
|
if (nlh->nlmsg_len >
|
|
(4 + NLMSG_SPACE(sizeof(struct inet_diag_req)))) {
|
|
struct rtattr *rta = (void *)(NLMSG_DATA(nlh) +
|
|
sizeof(struct inet_diag_req));
|
|
if (rta->rta_type != INET_DIAG_REQ_BYTECODE ||
|
|
rta->rta_len < 8 ||
|
|
rta->rta_len >
|
|
(nlh->nlmsg_len -
|
|
NLMSG_SPACE(sizeof(struct inet_diag_req))))
|
|
goto err_inval;
|
|
if (inet_diag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
|
|
goto err_inval;
|
|
}
|
|
return netlink_dump_start(idiagnl, skb, nlh,
|
|
inet_diag_dump, NULL);
|
|
} else
|
|
return inet_diag_get_exact(skb, nlh);
|
|
|
|
err_inval:
|
|
return -EINVAL;
|
|
}
|
|
|
|
|
|
static inline void inet_diag_rcv_skb(struct sk_buff *skb)
|
|
{
|
|
if (skb->len >= NLMSG_SPACE(0)) {
|
|
int err;
|
|
struct nlmsghdr *nlh = (struct nlmsghdr *)skb->data;
|
|
|
|
if (nlh->nlmsg_len < sizeof(*nlh) ||
|
|
skb->len < nlh->nlmsg_len)
|
|
return;
|
|
err = inet_diag_rcv_msg(skb, nlh);
|
|
if (err || nlh->nlmsg_flags & NLM_F_ACK)
|
|
netlink_ack(skb, nlh, err);
|
|
}
|
|
}
|
|
|
|
static void inet_diag_rcv(struct sock *sk, int len)
|
|
{
|
|
struct sk_buff *skb;
|
|
unsigned int qlen = skb_queue_len(&sk->sk_receive_queue);
|
|
|
|
while (qlen-- && (skb = skb_dequeue(&sk->sk_receive_queue))) {
|
|
inet_diag_rcv_skb(skb);
|
|
kfree_skb(skb);
|
|
}
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(inet_diag_register_lock);
|
|
|
|
int inet_diag_register(const struct inet_diag_handler *h)
|
|
{
|
|
const __u16 type = h->idiag_type;
|
|
int err = -EINVAL;
|
|
|
|
if (type >= INET_DIAG_GETSOCK_MAX)
|
|
goto out;
|
|
|
|
spin_lock(&inet_diag_register_lock);
|
|
err = -EEXIST;
|
|
if (inet_diag_table[type] == NULL) {
|
|
inet_diag_table[type] = h;
|
|
err = 0;
|
|
}
|
|
spin_unlock(&inet_diag_register_lock);
|
|
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 >= INET_DIAG_GETSOCK_MAX)
|
|
return;
|
|
|
|
spin_lock(&inet_diag_register_lock);
|
|
inet_diag_table[type] = NULL;
|
|
spin_unlock(&inet_diag_register_lock);
|
|
|
|
synchronize_rcu();
|
|
}
|
|
EXPORT_SYMBOL_GPL(inet_diag_unregister);
|
|
|
|
static int __init inet_diag_init(void)
|
|
{
|
|
const int inet_diag_table_size = (INET_DIAG_GETSOCK_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;
|
|
|
|
idiagnl = netlink_kernel_create(NETLINK_INET_DIAG, 0, inet_diag_rcv,
|
|
THIS_MODULE);
|
|
if (idiagnl == NULL)
|
|
goto out_free_table;
|
|
err = 0;
|
|
out:
|
|
return err;
|
|
out_free_table:
|
|
kfree(inet_diag_table);
|
|
goto out;
|
|
}
|
|
|
|
static void __exit inet_diag_exit(void)
|
|
{
|
|
sock_release(idiagnl->sk_socket);
|
|
kfree(inet_diag_table);
|
|
}
|
|
|
|
module_init(inet_diag_init);
|
|
module_exit(inet_diag_exit);
|
|
MODULE_LICENSE("GPL");
|