forked from Minki/linux
7f1fb60c4f
The ultimate goal is to get the sock_diag module, that works in family+protocol terms. Currently this is suitable to do on the inet_diag basis, so rename parts of the code. It will be moved to sock_diag.c later. Signed-off-by: Pavel Emelyanov <xemul@parallels.com> Signed-off-by: David S. Miller <davem@davemloft.net>
959 lines
23 KiB
C
959 lines
23 KiB
C
/*
|
|
* inet_diag.c Module for monitoring INET transport protocols sockets.
|
|
*
|
|
* Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; either version
|
|
* 2 of the License, or (at your option) any later version.
|
|
*/
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/module.h>
|
|
#include <linux/types.h>
|
|
#include <linux/fcntl.h>
|
|
#include <linux/random.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/cache.h>
|
|
#include <linux/init.h>
|
|
#include <linux/time.h>
|
|
|
|
#include <net/icmp.h>
|
|
#include <net/tcp.h>
|
|
#include <net/ipv6.h>
|
|
#include <net/inet_common.h>
|
|
#include <net/inet_connection_sock.h>
|
|
#include <net/inet_hashtables.h>
|
|
#include <net/inet_timewait_sock.h>
|
|
#include <net/inet6_hashtables.h>
|
|
#include <net/netlink.h>
|
|
|
|
#include <linux/inet.h>
|
|
#include <linux/stddef.h>
|
|
|
|
#include <linux/inet_diag.h>
|
|
|
|
static const struct inet_diag_handler **inet_diag_table;
|
|
|
|
struct inet_diag_entry {
|
|
__be32 *saddr;
|
|
__be32 *daddr;
|
|
u16 sport;
|
|
u16 dport;
|
|
u16 family;
|
|
u16 userlocks;
|
|
};
|
|
|
|
static struct sock *sdiagnl;
|
|
|
|
#define INET_DIAG_PUT(skb, attrtype, attrlen) \
|
|
RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
|
|
|
|
static DEFINE_MUTEX(inet_diag_table_mutex);
|
|
|
|
static const struct inet_diag_handler *inet_diag_lock_handler(int type)
|
|
{
|
|
if (!inet_diag_table[type])
|
|
request_module("net-pf-%d-proto-%d-type-%d", PF_NETLINK,
|
|
NETLINK_SOCK_DIAG, type);
|
|
|
|
mutex_lock(&inet_diag_table_mutex);
|
|
if (!inet_diag_table[type])
|
|
return ERR_PTR(-ENOENT);
|
|
|
|
return inet_diag_table[type];
|
|
}
|
|
|
|
static inline void inet_diag_unlock_handler(
|
|
const struct inet_diag_handler *handler)
|
|
{
|
|
mutex_unlock(&inet_diag_table_mutex);
|
|
}
|
|
|
|
static int inet_csk_diag_fill(struct sock *sk,
|
|
struct sk_buff *skb,
|
|
int ext, u32 pid, u32 seq, u16 nlmsg_flags,
|
|
const struct nlmsghdr *unlh)
|
|
{
|
|
const struct inet_sock *inet = inet_sk(sk);
|
|
const struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct inet_diag_msg *r;
|
|
struct nlmsghdr *nlh;
|
|
void *info = NULL;
|
|
struct inet_diag_meminfo *minfo = NULL;
|
|
unsigned char *b = skb_tail_pointer(skb);
|
|
const struct inet_diag_handler *handler;
|
|
|
|
handler = inet_diag_table[unlh->nlmsg_type];
|
|
BUG_ON(handler == NULL);
|
|
|
|
nlh = NLMSG_PUT(skb, pid, seq, unlh->nlmsg_type, sizeof(*r));
|
|
nlh->nlmsg_flags = nlmsg_flags;
|
|
|
|
r = NLMSG_DATA(nlh);
|
|
BUG_ON(sk->sk_state == TCP_TIME_WAIT);
|
|
|
|
if (ext & (1 << (INET_DIAG_MEMINFO - 1)))
|
|
minfo = INET_DIAG_PUT(skb, INET_DIAG_MEMINFO, sizeof(*minfo));
|
|
|
|
if (ext & (1 << (INET_DIAG_INFO - 1)))
|
|
info = INET_DIAG_PUT(skb, INET_DIAG_INFO,
|
|
handler->idiag_info_size);
|
|
|
|
if ((ext & (1 << (INET_DIAG_CONG - 1))) && icsk->icsk_ca_ops) {
|
|
const size_t len = strlen(icsk->icsk_ca_ops->name);
|
|
|
|
strcpy(INET_DIAG_PUT(skb, INET_DIAG_CONG, len + 1),
|
|
icsk->icsk_ca_ops->name);
|
|
}
|
|
|
|
r->idiag_family = sk->sk_family;
|
|
r->idiag_state = sk->sk_state;
|
|
r->idiag_timer = 0;
|
|
r->idiag_retrans = 0;
|
|
|
|
r->id.idiag_if = sk->sk_bound_dev_if;
|
|
r->id.idiag_cookie[0] = (u32)(unsigned long)sk;
|
|
r->id.idiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
|
|
|
|
r->id.idiag_sport = inet->inet_sport;
|
|
r->id.idiag_dport = inet->inet_dport;
|
|
r->id.idiag_src[0] = inet->inet_rcv_saddr;
|
|
r->id.idiag_dst[0] = inet->inet_daddr;
|
|
|
|
/* IPv6 dual-stack sockets use inet->tos for IPv4 connections,
|
|
* hence this needs to be included regardless of socket family.
|
|
*/
|
|
if (ext & (1 << (INET_DIAG_TOS - 1)))
|
|
RTA_PUT_U8(skb, INET_DIAG_TOS, inet->tos);
|
|
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
if (r->idiag_family == AF_INET6) {
|
|
const struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
*(struct in6_addr *)r->id.idiag_src = np->rcv_saddr;
|
|
*(struct in6_addr *)r->id.idiag_dst = np->daddr;
|
|
if (ext & (1 << (INET_DIAG_TCLASS - 1)))
|
|
RTA_PUT_U8(skb, INET_DIAG_TCLASS, np->tclass);
|
|
}
|
|
#endif
|
|
|
|
#define EXPIRES_IN_MS(tmo) DIV_ROUND_UP((tmo - jiffies) * 1000, HZ)
|
|
|
|
if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
|
|
r->idiag_timer = 1;
|
|
r->idiag_retrans = icsk->icsk_retransmits;
|
|
r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
|
|
} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
|
|
r->idiag_timer = 4;
|
|
r->idiag_retrans = icsk->icsk_probes_out;
|
|
r->idiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
|
|
} else if (timer_pending(&sk->sk_timer)) {
|
|
r->idiag_timer = 2;
|
|
r->idiag_retrans = icsk->icsk_probes_out;
|
|
r->idiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
|
|
} else {
|
|
r->idiag_timer = 0;
|
|
r->idiag_expires = 0;
|
|
}
|
|
#undef EXPIRES_IN_MS
|
|
|
|
r->idiag_uid = sock_i_uid(sk);
|
|
r->idiag_inode = sock_i_ino(sk);
|
|
|
|
if (minfo) {
|
|
minfo->idiag_rmem = sk_rmem_alloc_get(sk);
|
|
minfo->idiag_wmem = sk->sk_wmem_queued;
|
|
minfo->idiag_fmem = sk->sk_forward_alloc;
|
|
minfo->idiag_tmem = sk_wmem_alloc_get(sk);
|
|
}
|
|
|
|
handler->idiag_get_info(sk, r, info);
|
|
|
|
if (sk->sk_state < TCP_TIME_WAIT &&
|
|
icsk->icsk_ca_ops && icsk->icsk_ca_ops->get_info)
|
|
icsk->icsk_ca_ops->get_info(sk, ext, skb);
|
|
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - b;
|
|
return skb->len;
|
|
|
|
rtattr_failure:
|
|
nlmsg_failure:
|
|
nlmsg_trim(skb, b);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int inet_twsk_diag_fill(struct inet_timewait_sock *tw,
|
|
struct sk_buff *skb, int ext, u32 pid,
|
|
u32 seq, u16 nlmsg_flags,
|
|
const struct nlmsghdr *unlh)
|
|
{
|
|
long tmo;
|
|
struct inet_diag_msg *r;
|
|
const unsigned char *previous_tail = skb_tail_pointer(skb);
|
|
struct nlmsghdr *nlh = NLMSG_PUT(skb, pid, seq,
|
|
unlh->nlmsg_type, sizeof(*r));
|
|
|
|
r = NLMSG_DATA(nlh);
|
|
BUG_ON(tw->tw_state != TCP_TIME_WAIT);
|
|
|
|
nlh->nlmsg_flags = nlmsg_flags;
|
|
|
|
tmo = tw->tw_ttd - jiffies;
|
|
if (tmo < 0)
|
|
tmo = 0;
|
|
|
|
r->idiag_family = tw->tw_family;
|
|
r->idiag_retrans = 0;
|
|
r->id.idiag_if = tw->tw_bound_dev_if;
|
|
r->id.idiag_cookie[0] = (u32)(unsigned long)tw;
|
|
r->id.idiag_cookie[1] = (u32)(((unsigned long)tw >> 31) >> 1);
|
|
r->id.idiag_sport = tw->tw_sport;
|
|
r->id.idiag_dport = tw->tw_dport;
|
|
r->id.idiag_src[0] = tw->tw_rcv_saddr;
|
|
r->id.idiag_dst[0] = tw->tw_daddr;
|
|
r->idiag_state = tw->tw_substate;
|
|
r->idiag_timer = 3;
|
|
r->idiag_expires = DIV_ROUND_UP(tmo * 1000, HZ);
|
|
r->idiag_rqueue = 0;
|
|
r->idiag_wqueue = 0;
|
|
r->idiag_uid = 0;
|
|
r->idiag_inode = 0;
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
if (tw->tw_family == AF_INET6) {
|
|
const struct inet6_timewait_sock *tw6 =
|
|
inet6_twsk((struct sock *)tw);
|
|
|
|
*(struct in6_addr *)r->id.idiag_src = tw6->tw_v6_rcv_saddr;
|
|
*(struct in6_addr *)r->id.idiag_dst = tw6->tw_v6_daddr;
|
|
}
|
|
#endif
|
|
nlh->nlmsg_len = skb_tail_pointer(skb) - previous_tail;
|
|
return skb->len;
|
|
nlmsg_failure:
|
|
nlmsg_trim(skb, previous_tail);
|
|
return -EMSGSIZE;
|
|
}
|
|
|
|
static int sk_diag_fill(struct sock *sk, struct sk_buff *skb,
|
|
int ext, u32 pid, u32 seq, u16 nlmsg_flags,
|
|
const struct nlmsghdr *unlh)
|
|
{
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
return inet_twsk_diag_fill((struct inet_timewait_sock *)sk,
|
|
skb, ext, pid, seq, nlmsg_flags,
|
|
unlh);
|
|
return inet_csk_diag_fill(sk, skb, ext, pid, seq, nlmsg_flags, unlh);
|
|
}
|
|
|
|
static int inet_diag_get_exact(struct sk_buff *in_skb,
|
|
const struct nlmsghdr *nlh)
|
|
{
|
|
int err;
|
|
struct sock *sk;
|
|
struct inet_diag_req *req = NLMSG_DATA(nlh);
|
|
struct sk_buff *rep;
|
|
struct inet_hashinfo *hashinfo;
|
|
const struct inet_diag_handler *handler;
|
|
|
|
handler = inet_diag_lock_handler(nlh->nlmsg_type);
|
|
if (IS_ERR(handler)) {
|
|
err = PTR_ERR(handler);
|
|
goto unlock;
|
|
}
|
|
|
|
hashinfo = handler->idiag_hashinfo;
|
|
err = -EINVAL;
|
|
|
|
if (req->idiag_family == AF_INET) {
|
|
sk = inet_lookup(&init_net, hashinfo, req->id.idiag_dst[0],
|
|
req->id.idiag_dport, req->id.idiag_src[0],
|
|
req->id.idiag_sport, req->id.idiag_if);
|
|
}
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
else if (req->idiag_family == AF_INET6) {
|
|
sk = inet6_lookup(&init_net, hashinfo,
|
|
(struct in6_addr *)req->id.idiag_dst,
|
|
req->id.idiag_dport,
|
|
(struct in6_addr *)req->id.idiag_src,
|
|
req->id.idiag_sport,
|
|
req->id.idiag_if);
|
|
}
|
|
#endif
|
|
else {
|
|
goto unlock;
|
|
}
|
|
|
|
err = -ENOENT;
|
|
if (sk == NULL)
|
|
goto unlock;
|
|
|
|
err = -ESTALE;
|
|
if ((req->id.idiag_cookie[0] != INET_DIAG_NOCOOKIE ||
|
|
req->id.idiag_cookie[1] != INET_DIAG_NOCOOKIE) &&
|
|
((u32)(unsigned long)sk != req->id.idiag_cookie[0] ||
|
|
(u32)((((unsigned long)sk) >> 31) >> 1) != req->id.idiag_cookie[1]))
|
|
goto out;
|
|
|
|
err = -ENOMEM;
|
|
rep = alloc_skb(NLMSG_SPACE((sizeof(struct inet_diag_msg) +
|
|
sizeof(struct inet_diag_meminfo) +
|
|
handler->idiag_info_size + 64)),
|
|
GFP_KERNEL);
|
|
if (!rep)
|
|
goto out;
|
|
|
|
err = sk_diag_fill(sk, rep, req->idiag_ext,
|
|
NETLINK_CB(in_skb).pid,
|
|
nlh->nlmsg_seq, 0, nlh);
|
|
if (err < 0) {
|
|
WARN_ON(err == -EMSGSIZE);
|
|
kfree_skb(rep);
|
|
goto out;
|
|
}
|
|
err = netlink_unicast(sdiagnl, rep, NETLINK_CB(in_skb).pid,
|
|
MSG_DONTWAIT);
|
|
if (err > 0)
|
|
err = 0;
|
|
|
|
out:
|
|
if (sk) {
|
|
if (sk->sk_state == TCP_TIME_WAIT)
|
|
inet_twsk_put((struct inet_timewait_sock *)sk);
|
|
else
|
|
sock_put(sk);
|
|
}
|
|
unlock:
|
|
inet_diag_unlock_handler(handler);
|
|
return err;
|
|
}
|
|
|
|
static int bitstring_match(const __be32 *a1, const __be32 *a2, int bits)
|
|
{
|
|
int words = bits >> 5;
|
|
|
|
bits &= 0x1f;
|
|
|
|
if (words) {
|
|
if (memcmp(a1, a2, words << 2))
|
|
return 0;
|
|
}
|
|
if (bits) {
|
|
__be32 w1, w2;
|
|
__be32 mask;
|
|
|
|
w1 = a1[words];
|
|
w2 = a2[words];
|
|
|
|
mask = htonl((0xffffffff) << (32 - bits));
|
|
|
|
if ((w1 ^ w2) & mask)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
static int inet_diag_bc_run(const void *bc, int len,
|
|
const struct inet_diag_entry *entry)
|
|
{
|
|
while (len > 0) {
|
|
int yes = 1;
|
|
const struct inet_diag_bc_op *op = bc;
|
|
|
|
switch (op->code) {
|
|
case INET_DIAG_BC_NOP:
|
|
break;
|
|
case INET_DIAG_BC_JMP:
|
|
yes = 0;
|
|
break;
|
|
case INET_DIAG_BC_S_GE:
|
|
yes = entry->sport >= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_S_LE:
|
|
yes = entry->sport <= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_D_GE:
|
|
yes = entry->dport >= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_D_LE:
|
|
yes = entry->dport <= op[1].no;
|
|
break;
|
|
case INET_DIAG_BC_AUTO:
|
|
yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
|
|
break;
|
|
case INET_DIAG_BC_S_COND:
|
|
case INET_DIAG_BC_D_COND: {
|
|
struct inet_diag_hostcond *cond;
|
|
__be32 *addr;
|
|
|
|
cond = (struct inet_diag_hostcond *)(op + 1);
|
|
if (cond->port != -1 &&
|
|
cond->port != (op->code == INET_DIAG_BC_S_COND ?
|
|
entry->sport : entry->dport)) {
|
|
yes = 0;
|
|
break;
|
|
}
|
|
|
|
if (cond->prefix_len == 0)
|
|
break;
|
|
|
|
if (op->code == INET_DIAG_BC_S_COND)
|
|
addr = entry->saddr;
|
|
else
|
|
addr = entry->daddr;
|
|
|
|
if (bitstring_match(addr, cond->addr,
|
|
cond->prefix_len))
|
|
break;
|
|
if (entry->family == AF_INET6 &&
|
|
cond->family == AF_INET) {
|
|
if (addr[0] == 0 && addr[1] == 0 &&
|
|
addr[2] == htonl(0xffff) &&
|
|
bitstring_match(addr + 3, cond->addr,
|
|
cond->prefix_len))
|
|
break;
|
|
}
|
|
yes = 0;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (yes) {
|
|
len -= op->yes;
|
|
bc += op->yes;
|
|
} else {
|
|
len -= op->no;
|
|
bc += op->no;
|
|
}
|
|
}
|
|
return len == 0;
|
|
}
|
|
|
|
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 = NLMSG_DATA(cb->nlh);
|
|
|
|
if (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
|
|
struct inet_diag_entry entry;
|
|
const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
|
|
sizeof(*r),
|
|
INET_DIAG_REQ_BYTECODE);
|
|
struct inet_sock *inet = inet_sk(sk);
|
|
|
|
entry.family = sk->sk_family;
|
|
#if defined(CONFIG_IPV6) || defined (CONFIG_IPV6_MODULE)
|
|
if (entry.family == AF_INET6) {
|
|
struct ipv6_pinfo *np = inet6_sk(sk);
|
|
|
|
entry.saddr = np->rcv_saddr.s6_addr32;
|
|
entry.daddr = np->daddr.s6_addr32;
|
|
} else
|
|
#endif
|
|
{
|
|
entry.saddr = &inet->inet_rcv_saddr;
|
|
entry.daddr = &inet->inet_daddr;
|
|
}
|
|
entry.sport = inet->inet_num;
|
|
entry.dport = ntohs(inet->inet_dport);
|
|
entry.userlocks = sk->sk_userlocks;
|
|
|
|
if (!inet_diag_bc_run(nla_data(bc), nla_len(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 (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
|
|
struct inet_diag_entry entry;
|
|
const struct nlattr *bc = nlmsg_find_attr(cb->nlh,
|
|
sizeof(*r),
|
|
INET_DIAG_REQ_BYTECODE);
|
|
|
|
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(nla_data(bc), nla_len(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_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;
|
|
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->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) {
|
|
*(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_entry entry;
|
|
struct inet_diag_req *r = NLMSG_DATA(cb->nlh);
|
|
struct inet_connection_sock *icsk = inet_csk(sk);
|
|
struct listen_sock *lopt;
|
|
const struct nlattr *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 (nlmsg_attrlen(cb->nlh, sizeof(*r))) {
|
|
bc = nlmsg_find_attr(cb->nlh, sizeof(*r),
|
|
INET_DIAG_REQ_BYTECODE);
|
|
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 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(nla_data(bc),
|
|
nla_len(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_lock_handler(cb->nlh->nlmsg_type);
|
|
if (IS_ERR(handler))
|
|
goto unlock;
|
|
|
|
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;
|
|
|
|
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->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) < 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) < 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 unlock;
|
|
|
|
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->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) < 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->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) {
|
|
spin_unlock_bh(lock);
|
|
goto done;
|
|
}
|
|
next_dying:
|
|
++num;
|
|
}
|
|
}
|
|
spin_unlock_bh(lock);
|
|
}
|
|
|
|
done:
|
|
cb->args[1] = i;
|
|
cb->args[2] = num;
|
|
unlock:
|
|
inet_diag_unlock_handler(handler);
|
|
return skb->len;
|
|
}
|
|
|
|
static int inet_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
int hdrlen = sizeof(struct inet_diag_req);
|
|
|
|
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(sdiagnl, skb, nlh,
|
|
inet_diag_dump, NULL, 0);
|
|
}
|
|
|
|
return inet_diag_get_exact(skb, nlh);
|
|
}
|
|
|
|
static int sock_diag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
|
|
{
|
|
return inet_diag_rcv_msg(skb, nlh);
|
|
}
|
|
|
|
static DEFINE_MUTEX(sock_diag_mutex);
|
|
|
|
static void sock_diag_rcv(struct sk_buff *skb)
|
|
{
|
|
mutex_lock(&sock_diag_mutex);
|
|
netlink_rcv_skb(skb, &sock_diag_rcv_msg);
|
|
mutex_unlock(&sock_diag_mutex);
|
|
}
|
|
|
|
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;
|
|
|
|
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 >= INET_DIAG_GETSOCK_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 = (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;
|
|
|
|
sdiagnl = netlink_kernel_create(&init_net, NETLINK_SOCK_DIAG, 0,
|
|
sock_diag_rcv, NULL, THIS_MODULE);
|
|
if (sdiagnl == 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)
|
|
{
|
|
netlink_kernel_release(sdiagnl);
|
|
kfree(inet_diag_table);
|
|
}
|
|
|
|
module_init(inet_diag_init);
|
|
module_exit(inet_diag_exit);
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_NET_PF_PROTO(PF_NETLINK, NETLINK_SOCK_DIAG);
|