/*
* 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) \
({ int rtalen = RTA_LENGTH(attrlen); \
struct rtattr *rta; \
if (skb_tailroom(skb) < RTA_ALIGN(rtalen)) goto nlmsg_failure; \
rta = (void*)__skb_put(skb, RTA_ALIGN(rtalen)); \
rta->rta_type = attrtype; \
rta->rta_len = rtalen; \
RTA_DATA(rta); })
static int tcpdiag_fill(struct sk_buff *skb, struct sock *sk,
int ext, u32 pid, u32 seq, u16 nlmsg_flags)
{
struct inet_sock *inet = inet_sk(sk);
struct tcp_sock *tp = tcp_sk(sk);
struct tcpdiagmsg *r;
struct nlmsghdr *nlh;
struct tcp_info *info = NULL;
struct tcpdiag_meminfo *minfo = NULL;
struct tcpvegas_info *vinfo = 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 ((tcp_is_westwood(tp) || tcp_is_vegas(tp))
&& (ext & (1<<(TCPDIAG_VEGASINFO-1))))
vinfo = TCPDIAG_PUT(skb, TCPDIAG_VEGASINFO, sizeof(*vinfo));
}
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) {
struct tcp_tw_bucket *tw = (struct tcp_tw_bucket*)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) {
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_src,
&tw->tw_v6_rcv_saddr);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
&tw->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 (tp->pending == TCP_TIME_RETRANS) {
r->tcpdiag_timer = 1;
r->tcpdiag_retrans = tp->retransmits;
r->tcpdiag_expires = EXPIRES_IN_MS(tp->timeout);
} else if (tp->pending == TCP_TIME_PROBE0) {
r->tcpdiag_timer = 4;
r->tcpdiag_retrans = tp->probes_out;
r->tcpdiag_expires = EXPIRES_IN_MS(tp->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 (vinfo) {
if (tcp_is_vegas(tp)) {
vinfo->tcpv_enabled = tp->vegas.doing_vegas_now;
vinfo->tcpv_rttcnt = tp->vegas.cntRTT;
vinfo->tcpv_rtt = jiffies_to_usecs(tp->vegas.baseRTT);
vinfo->tcpv_minrtt = jiffies_to_usecs(tp->vegas.minRTT);
} else {
vinfo->tcpv_enabled = 0;
vinfo->tcpv_rttcnt = 0;
vinfo->tcpv_rtt = jiffies_to_usecs(tp->westwood.rtt);
vinfo->tcpv_minrtt = jiffies_to_usecs(tp->westwood.rtt_min);
}
}
nlh->nlmsg_len = skb->tail - b;
return skb->len;
nlmsg_failure:
skb_trim(skb, b - skb->data);
return -1;
}
extern struct sock *tcp_v4_lookup(u32 saddr, u16 sport, u32 daddr, u16 dport,
int dif);
#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 = tcp_v4_lookup(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)
tcp_tw_put((struct tcp_tw_bucket*)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 open_request *req,
u32 pid, u32 seq)
{
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 = req->rmt_port;
r->id.tcpdiag_src[0] = req->af.v4_req.loc_addr;
r->id.tcpdiag_dst[0] = req->af.v4_req.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,
&req->af.v6_req.loc_addr);
ipv6_addr_copy((struct in6_addr *)r->id.tcpdiag_dst,
&req->af.v6_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 tcp_sock *tp = tcp_sk(sk);
struct tcp_listen_opt *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(&tp->syn_wait_lock);
lopt = tp->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 open_request *req, *head = lopt->syn_table[j];
reqnum = 0;
for (req = head; req; reqnum++, req = req->dl_next) {
if (reqnum < s_reqnum)
continue;
if (r->id.tcpdiag_dport != req->rmt_port &&
r->id.tcpdiag_dport)
continue;
if (bc) {
entry.saddr =
#ifdef CONFIG_IP_TCPDIAG_IPV6
(entry.family == AF_INET6) ?
req->af.v6_req.loc_addr.s6_addr32 :
#endif
&req->af.v4_req.loc_addr;
entry.daddr =
#ifdef CONFIG_IP_TCPDIAG_IPV6
(entry.family == AF_INET6) ?
req->af.v6_req.rmt_addr.s6_addr32 :
#endif
&req->af.v4_req.rmt_addr;
entry.dport = ntohs(req->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(&tp->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;
tcp_listen_lock();
for (i = s_i; i < TCP_LHTABLE_SIZE; i++) {
struct sock *sk;
struct hlist_node *node;
num = 0;
sk_for_each(sk, node, &tcp_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) {
tcp_listen_unlock();
goto done;
}
syn_recv:
if (!(r->tcpdiag_states&TCPF_SYN_RECV))
goto next_listen;
if (tcpdiag_dump_reqs(skb, sk, cb) < 0) {
tcp_listen_unlock();
goto done;
}
next_listen:
cb->args[3] = 0;
cb->args[4] = 0;
++num;
}
s_num = 0;
cb->args[3] = 0;
cb->args[4] = 0;
}
tcp_listen_unlock();
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_ehash_size; i++) {
struct tcp_ehash_bucket *head = &tcp_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_ehash[i + tcp_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;
while ((skb = skb_dequeue(&sk->sk_receive_queue)) != NULL) {
tcpdiag_rcv_skb(skb);
kfree_skb(skb);
}
}
static int __init tcpdiag_init(void)
{
tcpnl = netlink_kernel_create(NETLINK_TCPDIAG, tcpdiag_rcv);
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");
