android_kernel_motorola_sm6225/net/ipv4/tcp_diag.c
Arnaldo Carvalho de Melo 463c84b97f [NET]: Introduce inet_connection_sock
This creates struct inet_connection_sock, moving members out of struct
tcp_sock that are shareable with other INET connection oriented
protocols, such as DCCP, that in my private tree already uses most of
these members.

The functions that operate on these members were renamed, using a
inet_csk_ prefix while not being moved yet to a new file, so as to
ease the review of these changes.

Signed-off-by: Arnaldo Carvalho de Melo <acme@ghostprotocols.net>
Signed-off-by: David S. Miller <davem@davemloft.net>
2005-08-29 15:43:19 -07:00

792 lines
18 KiB
C

/*
* tcp_diag.c Module for monitoring TCP sockets.
*
* Version: $Id: tcp_diag.c,v 1.3 2002/02/01 22:01:04 davem Exp $
*
* 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/config.h>
#include <linux/module.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/random.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 <linux/inet.h>
#include <linux/stddef.h>
#include <linux/tcp_diag.h>
struct tcpdiag_entry
{
u32 *saddr;
u32 *daddr;
u16 sport;
u16 dport;
u16 family;
u16 userlocks;
};
static struct sock *tcpnl;
#define TCPDIAG_PUT(skb, attrtype, attrlen) \
RTA_DATA(__RTA_PUT(skb, attrtype, attrlen))
static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
int ext, u32 pid, u32 seq, u16 nlmsg_flags)
{
const struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
const struct inet_connection_sock *icsk = inet_csk(sk);
struct tcpdiagmsg *r;
struct nlmsghdr *nlh;
struct tcp_info *info = NULL;
struct tcpdiag_meminfo *minfo = NULL;
unsigned char *b = skb->tail;
nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
nlh->nlmsg_flags = nlmsg_flags;
r = NLMSG_DATA(nlh);
if (sk->sk_state != TCP_TIME_WAIT) {
if (ext & (1<<(TCPDIAG_MEMINFO-1)))
minfo = TCPDIAG_PUT(skb, TCPDIAG_MEMINFO, sizeof(*minfo));
if (ext & (1<<(TCPDIAG_INFO-1)))
info = TCPDIAG_PUT(skb, TCPDIAG_INFO, sizeof(*info));
if (ext & (1<<(TCPDIAG_CONG-1))) {
size_t len = strlen(tp->ca_ops->name);
strcpy(TCPDIAG_PUT(skb, TCPDIAG_CONG, len+1),
tp->ca_ops->name);
}
}
r->tcpdiag_family = sk->sk_family;
r->tcpdiag_state = sk->sk_state;
r->tcpdiag_timer = 0;
r->tcpdiag_retrans = 0;
r->id.tcpdiag_if = sk->sk_bound_dev_if;
r->id.tcpdiag_cookie[0] = (u32)(unsigned long)sk;
r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)sk >> 31) >> 1);
if (r->tcpdiag_state == TCP_TIME_WAIT) {
const struct inet_timewait_sock *tw = inet_twsk(sk);
long tmo = tw->tw_ttd - jiffies;
if (tmo < 0)
tmo = 0;
r->id.tcpdiag_sport = tw->tw_sport;
r->id.tcpdiag_dport = tw->tw_dport;
r->id.tcpdiag_src[0] = tw->tw_rcv_saddr;
r->id.tcpdiag_dst[0] = tw->tw_daddr;
r->tcpdiag_state = tw->tw_substate;
r->tcpdiag_timer = 3;
r->tcpdiag_expires = (tmo*1000+HZ-1)/HZ;
r->tcpdiag_rqueue = 0;
r->tcpdiag_wqueue = 0;
r->tcpdiag_uid = 0;
r->tcpdiag_inode = 0;
#ifdef CONFIG_IP_TCPDIAG_IPV6
if (r->tcpdiag_family == AF_INET6) {
const struct tcp6_timewait_sock *tcp6tw = tcp6_twsk(sk);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
&tcp6tw->tw_v6_rcv_saddr);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
&tcp6tw->tw_v6_daddr);
}
#endif
nlh->nlmsg_len = skb->tail - b;
return skb->len;
}
r->id.tcpdiag_sport = inet->sport;
r->id.tcpdiag_dport = inet->dport;
r->id.tcpdiag_src[0] = inet->rcv_saddr;
r->id.tcpdiag_dst[0] = inet->daddr;
#ifdef CONFIG_IP_TCPDIAG_IPV6
if (r->tcpdiag_family == AF_INET6) {
struct ipv6_pinfo *np = inet6_sk(sk);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
&np->rcv_saddr);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
&np->daddr);
}
#endif
#define EXPIRES_IN_MS(tmo) ((tmo-jiffies)*1000+HZ-1)/HZ
if (icsk->icsk_pending == ICSK_TIME_RETRANS) {
r->tcpdiag_timer = 1;
r->tcpdiag_retrans = icsk->icsk_retransmits;
r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
} else if (icsk->icsk_pending == ICSK_TIME_PROBE0) {
r->tcpdiag_timer = 4;
r->tcpdiag_retrans = tp->probes_out;
r->tcpdiag_expires = EXPIRES_IN_MS(icsk->icsk_timeout);
} else if (timer_pending(&sk->sk_timer)) {
r->tcpdiag_timer = 2;
r->tcpdiag_retrans = tp->probes_out;
r->tcpdiag_expires = EXPIRES_IN_MS(sk->sk_timer.expires);
} else {
r->tcpdiag_timer = 0;
r->tcpdiag_expires = 0;
}
#undef EXPIRES_IN_MS
r->tcpdiag_rqueue = tp->rcv_nxt - tp->copied_seq;
r->tcpdiag_wqueue = tp->write_seq - tp->snd_una;
r->tcpdiag_uid = sock_i_uid(sk);
r->tcpdiag_inode = sock_i_ino(sk);
if (minfo) {
minfo->tcpdiag_rmem = atomic_read(&sk->sk_rmem_alloc);
minfo->tcpdiag_wmem = sk->sk_wmem_queued;
minfo->tcpdiag_fmem = sk->sk_forward_alloc;
minfo->tcpdiag_tmem = atomic_read(&sk->sk_wmem_alloc);
}
if (info)
tcp_get_info(sk, info);
if (sk->sk_state < TCP_TIME_WAIT && tp->ca_ops->get_info)
tp->ca_ops->get_info(tp, ext, skb);
nlh->nlmsg_len = skb->tail - b;
return skb->len;
rtattr_failure:
nlmsg_failure:
skb_trim(skb, b - skb->data);
return -1;
}
#ifdef CONFIG_IP_TCPDIAG_IPV6
extern struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
struct in6_addr *daddr, u16 dport,
int dif);
#else
static inline struct sock *tcp_v6_lookup(struct in6_addr *saddr, u16 sport,
struct in6_addr *daddr, u16 dport,
int dif)
{
return NULL;
}
#endif
static int tcpdiag_get_exact(struct sk_buff *in_skb, const struct nlmsghdr *nlh)
{
int err;
struct sock *sk;
struct tcpdiagreq *req = NLMSG_DATA(nlh);
struct sk_buff *rep;
if (req->tcpdiag_family == AF_INET) {
sk = inet_lookup(&tcp_hashinfo, req->id.tcpdiag_dst[0],
req->id.tcpdiag_dport, req->id.tcpdiag_src[0],
req->id.tcpdiag_sport, req->id.tcpdiag_if);
}
#ifdef CONFIG_IP_TCPDIAG_IPV6
else if (req->tcpdiag_family == AF_INET6) {
sk = tcp_v6_lookup((struct in6_addr*)req->id.tcpdiag_dst, req->id.tcpdiag_dport,
(struct in6_addr*)req->id.tcpdiag_src, req->id.tcpdiag_sport,
req->id.tcpdiag_if);
}
#endif
else {
return -EINVAL;
}
if (sk == NULL)
return -ENOENT;
err = -ESTALE;
if ((req->id.tcpdiag_cookie[0] != TCPDIAG_NOCOOKIE ||
req->id.tcpdiag_cookie[1] != TCPDIAG_NOCOOKIE) &&
((u32)(unsigned long)sk != req->id.tcpdiag_cookie[0] ||
(u32)((((unsigned long)sk) >> 31) >> 1) != req->id.tcpdiag_cookie[1]))
goto out;
err = -ENOMEM;
rep = alloc_skb(NLMSG_SPACE(sizeof(struct tcpdiagmsg)+
sizeof(struct tcpdiag_meminfo)+
sizeof(struct tcp_info)+64), GFP_KERNEL);
if (!rep)
goto out;
if (tcpdiag_fill(rep, sk, req->tcpdiag_ext,
NETLINK_CB(in_skb).pid,
nlh->nlmsg_seq, 0) <= 0)
BUG();
err = netlink_unicast(tcpnl, 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);
}
return err;
}
static int bitstring_match(const u32 *a1, const u32 *a2, int bits)
{
int words = bits >> 5;
bits &= 0x1f;
if (words) {
if (memcmp(a1, a2, words << 2))
return 0;
}
if (bits) {
__u32 w1, w2;
__u32 mask;
w1 = a1[words];
w2 = a2[words];
mask = htonl((0xffffffff) << (32 - bits));
if ((w1 ^ w2) & mask)
return 0;
}
return 1;
}
static int tcpdiag_bc_run(const void *bc, int len,
const struct tcpdiag_entry *entry)
{
while (len > 0) {
int yes = 1;
const struct tcpdiag_bc_op *op = bc;
switch (op->code) {
case TCPDIAG_BC_NOP:
break;
case TCPDIAG_BC_JMP:
yes = 0;
break;
case TCPDIAG_BC_S_GE:
yes = entry->sport >= op[1].no;
break;
case TCPDIAG_BC_S_LE:
yes = entry->dport <= op[1].no;
break;
case TCPDIAG_BC_D_GE:
yes = entry->dport >= op[1].no;
break;
case TCPDIAG_BC_D_LE:
yes = entry->dport <= op[1].no;
break;
case TCPDIAG_BC_AUTO:
yes = !(entry->userlocks & SOCK_BINDPORT_LOCK);
break;
case TCPDIAG_BC_S_COND:
case TCPDIAG_BC_D_COND:
{
struct tcpdiag_hostcond *cond = (struct tcpdiag_hostcond*)(op+1);
u32 *addr;
if (cond->port != -1 &&
cond->port != (op->code == TCPDIAG_BC_S_COND ?
entry->sport : entry->dport)) {
yes = 0;
break;
}
if (cond->prefix_len == 0)
break;
if (op->code == TCPDIAG_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 tcpdiag_bc_op *op = bc;
if (cc > len)
return 0;
if (cc == len)
return 1;
if (op->yes < 4)
return 0;
len -= op->yes;
bc += op->yes;
}
return 0;
}
static int tcpdiag_bc_audit(const void *bytecode, int bytecode_len)
{
const unsigned char *bc = bytecode;
int len = bytecode_len;
while (len > 0) {
struct tcpdiag_bc_op *op = (struct tcpdiag_bc_op*)bc;
//printk("BC: %d %d %d {%d} / %d\n", op->code, op->yes, op->no, op[1].no, len);
switch (op->code) {
case TCPDIAG_BC_AUTO:
case TCPDIAG_BC_S_COND:
case TCPDIAG_BC_D_COND:
case TCPDIAG_BC_S_GE:
case TCPDIAG_BC_S_LE:
case TCPDIAG_BC_D_GE:
case TCPDIAG_BC_D_LE:
if (op->yes < 4 || op->yes > len+4)
return -EINVAL;
case TCPDIAG_BC_JMP:
if (op->no < 4 || op->no > len+4)
return -EINVAL;
if (op->no < len &&
!valid_cc(bytecode, bytecode_len, len-op->no))
return -EINVAL;
break;
case TCPDIAG_BC_NOP:
if (op->yes < 4 || op->yes > len+4)
return -EINVAL;
break;
default:
return -EINVAL;
}
bc += op->yes;
len -= op->yes;
}
return len == 0 ? 0 : -EINVAL;
}
static int tcpdiag_dump_sock(struct sk_buff *skb, struct sock *sk,
struct netlink_callback *cb)
{
struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
if (cb->nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(*r))) {
struct tcpdiag_entry entry;
struct rtattr *bc = (struct rtattr *)(r + 1);
struct inet_sock *inet = inet_sk(sk);
entry.family = sk->sk_family;
#ifdef CONFIG_IP_TCPDIAG_IPV6
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->rcv_saddr;
entry.daddr = &inet->daddr;
}
entry.sport = inet->num;
entry.dport = ntohs(inet->dport);
entry.userlocks = sk->sk_userlocks;
if (!tcpdiag_bc_run(RTA_DATA(bc), RTA_PAYLOAD(bc), &entry))
return 0;
}
return tcpdiag_fill(skb, sk, r->tcpdiag_ext, NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq, NLM_F_MULTI);
}
static int tcpdiag_fill_req(struct sk_buff *skb, struct sock *sk,
struct request_sock *req,
u32 pid, u32 seq)
{
const struct inet_request_sock *ireq = inet_rsk(req);
struct inet_sock *inet = inet_sk(sk);
unsigned char *b = skb->tail;
struct tcpdiagmsg *r;
struct nlmsghdr *nlh;
long tmo;
nlh = NLMSG_PUT(skb, pid, seq, TCPDIAG_GETSOCK, sizeof(*r));
nlh->nlmsg_flags = NLM_F_MULTI;
r = NLMSG_DATA(nlh);
r->tcpdiag_family = sk->sk_family;
r->tcpdiag_state = TCP_SYN_RECV;
r->tcpdiag_timer = 1;
r->tcpdiag_retrans = req->retrans;
r->id.tcpdiag_if = sk->sk_bound_dev_if;
r->id.tcpdiag_cookie[0] = (u32)(unsigned long)req;
r->id.tcpdiag_cookie[1] = (u32)(((unsigned long)req >> 31) >> 1);
tmo = req->expires - jiffies;
if (tmo < 0)
tmo = 0;
r->id.tcpdiag_sport = inet->sport;
r->id.tcpdiag_dport = ireq->rmt_port;
r->id.tcpdiag_src[0] = ireq->loc_addr;
r->id.tcpdiag_dst[0] = ireq->rmt_addr;
r->tcpdiag_expires = jiffies_to_msecs(tmo),
r->tcpdiag_rqueue = 0;
r->tcpdiag_wqueue = 0;
r->tcpdiag_uid = sock_i_uid(sk);
r->tcpdiag_inode = 0;
#ifdef CONFIG_IP_TCPDIAG_IPV6
if (r->tcpdiag_family == AF_INET6) {
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
&tcp6_rsk(req)->loc_addr);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
&tcp6_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 tcpdiag_dump_reqs(struct sk_buff *skb, struct sock *sk,
struct netlink_callback *cb)
{
struct tcpdiag_entry entry;
struct tcpdiagreq *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 < TCP_SYNQ_HSIZE; 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.tcpdiag_dport != ireq->rmt_port &&
r->id.tcpdiag_dport)
continue;
if (bc) {
entry.saddr =
#ifdef CONFIG_IP_TCPDIAG_IPV6
(entry.family == AF_INET6) ?
tcp6_rsk(req)->loc_addr.s6_addr32 :
#endif
&ireq->loc_addr;
entry.daddr =
#ifdef CONFIG_IP_TCPDIAG_IPV6
(entry.family == AF_INET6) ?
tcp6_rsk(req)->rmt_addr.s6_addr32 :
#endif
&ireq->rmt_addr;
entry.dport = ntohs(ireq->rmt_port);
if (!tcpdiag_bc_run(RTA_DATA(bc),
RTA_PAYLOAD(bc), &entry))
continue;
}
err = tcpdiag_fill_req(skb, sk, req,
NETLINK_CB(cb->skb).pid,
cb->nlh->nlmsg_seq);
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 tcpdiag_dump(struct sk_buff *skb, struct netlink_callback *cb)
{
int i, num;
int s_i, s_num;
struct tcpdiagreq *r = NLMSG_DATA(cb->nlh);
s_i = cb->args[1];
s_num = num = cb->args[2];
if (cb->args[0] == 0) {
if (!(r->tcpdiag_states&(TCPF_LISTEN|TCPF_SYN_RECV)))
goto skip_listen_ht;
inet_listen_lock(&tcp_hashinfo);
for (i = s_i; i < INET_LHTABLE_SIZE; i++) {
struct sock *sk;
struct hlist_node *node;
num = 0;
sk_for_each(sk, node, &tcp_hashinfo.listening_hash[i]) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num) {
num++;
continue;
}
if (r->id.tcpdiag_sport != inet->sport &&
r->id.tcpdiag_sport)
goto next_listen;
if (!(r->tcpdiag_states&TCPF_LISTEN) ||
r->id.tcpdiag_dport ||
cb->args[3] > 0)
goto syn_recv;
if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
inet_listen_unlock(&tcp_hashinfo);
goto done;
}
syn_recv:
if (!(r->tcpdiag_states&TCPF_SYN_RECV))
goto next_listen;
if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
inet_listen_unlock(&tcp_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(&tcp_hashinfo);
skip_listen_ht:
cb->args[0] = 1;
s_i = num = s_num = 0;
}
if (!(r->tcpdiag_states&~(TCPF_LISTEN|TCPF_SYN_RECV)))
return skb->len;
for (i = s_i; i < tcp_hashinfo.ehash_size; i++) {
struct inet_ehash_bucket *head = &tcp_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->tcpdiag_states & (1 << sk->sk_state)))
goto next_normal;
if (r->id.tcpdiag_sport != inet->sport &&
r->id.tcpdiag_sport)
goto next_normal;
if (r->id.tcpdiag_dport != inet->dport && r->id.tcpdiag_dport)
goto next_normal;
if (tcpdiag_dump_sock(skb, sk, cb) < 0) {
read_unlock_bh(&head->lock);
goto done;
}
next_normal:
++num;
}
if (r->tcpdiag_states&TCPF_TIME_WAIT) {
sk_for_each(sk, node,
&tcp_hashinfo.ehash[i + tcp_hashinfo.ehash_size].chain) {
struct inet_sock *inet = inet_sk(sk);
if (num < s_num)
goto next_dying;
if (r->id.tcpdiag_sport != inet->sport &&
r->id.tcpdiag_sport)
goto next_dying;
if (r->id.tcpdiag_dport != inet->dport &&
r->id.tcpdiag_dport)
goto next_dying;
if (tcpdiag_dump_sock(skb, sk, 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 int tcpdiag_dump_done(struct netlink_callback *cb)
{
return 0;
}
static __inline__ int
tcpdiag_rcv_msg(struct sk_buff *skb, struct nlmsghdr *nlh)
{
if (!(nlh->nlmsg_flags&NLM_F_REQUEST))
return 0;
if (nlh->nlmsg_type != TCPDIAG_GETSOCK)
goto err_inval;
if (NLMSG_LENGTH(sizeof(struct tcpdiagreq)) > skb->len)
goto err_inval;
if (nlh->nlmsg_flags&NLM_F_DUMP) {
if (nlh->nlmsg_len > 4 + NLMSG_SPACE(sizeof(struct tcpdiagreq))) {
struct rtattr *rta = (struct rtattr*)(NLMSG_DATA(nlh) + sizeof(struct tcpdiagreq));
if (rta->rta_type != TCPDIAG_REQ_BYTECODE ||
rta->rta_len < 8 ||
rta->rta_len > nlh->nlmsg_len - NLMSG_SPACE(sizeof(struct tcpdiagreq)))
goto err_inval;
if (tcpdiag_bc_audit(RTA_DATA(rta), RTA_PAYLOAD(rta)))
goto err_inval;
}
return netlink_dump_start(tcpnl, skb, nlh,
tcpdiag_dump,
tcpdiag_dump_done);
} else {
return tcpdiag_get_exact(skb, nlh);
}
err_inval:
return -EINVAL;
}
static inline void tcpdiag_rcv_skb(struct sk_buff *skb)
{
int err;
struct nlmsghdr * nlh;
if (skb->len >= NLMSG_SPACE(0)) {
nlh = (struct nlmsghdr *)skb->data;
if (nlh->nlmsg_len < sizeof(*nlh) || skb->len < nlh->nlmsg_len)
return;
err = tcpdiag_rcv_msg(skb, nlh);
if (err || nlh->nlmsg_flags & NLM_F_ACK)
netlink_ack(skb, nlh, err);
}
}
static void tcpdiag_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))) {
tcpdiag_rcv_skb(skb);
kfree_skb(skb);
}
}
static int __init tcpdiag_init(void)
{
tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv,
THIS_MODULE);
if (tcpnl == NULL)
return -ENOMEM;
return 0;
}
static void __exit tcpdiag_exit(void)
{
sock_release(tcpnl->sk_socket);
}
module_init(tcpdiag_init);
module_exit(tcpdiag_exit);
MODULE_LICENSE("GPL");