#include <linux/skbuff.h>
#include <linux/ipv6.h>
#include <net/ip6_checksum.h>
+#include <asm/unaligned.h>
#include <net/tcp.h>
#include <net/netfilter/nf_conntrack_l4proto.h>
#include <net/netfilter/nf_conntrack_ecache.h>
#include <net/netfilter/nf_log.h>
-
-/* Protects ct->proto.tcp */
-static DEFINE_RWLOCK(tcp_lock);
+#include <net/netfilter/ipv4/nf_conntrack_ipv4.h>
+#include <net/netfilter/ipv6/nf_conntrack_ipv6.h>
/* "Be conservative in what you do,
be liberal in what you accept from others."
"LAST_ACK",
"TIME_WAIT",
"CLOSE",
- "LISTEN"
+ "SYN_SENT2",
};
#define SECS * HZ
/* RFC1122 says the R2 limit should be at least 100 seconds.
Linux uses 15 packets as limit, which corresponds
to ~13-30min depending on RTO. */
-static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS;
+static unsigned int nf_ct_tcp_timeout_max_retrans __read_mostly = 5 MINS;
+static unsigned int nf_ct_tcp_timeout_unacknowledged __read_mostly = 5 MINS;
static unsigned int tcp_timeouts[TCP_CONNTRACK_MAX] __read_mostly = {
[TCP_CONNTRACK_SYN_SENT] = 2 MINS,
[TCP_CONNTRACK_LAST_ACK] = 30 SECS,
[TCP_CONNTRACK_TIME_WAIT] = 2 MINS,
[TCP_CONNTRACK_CLOSE] = 10 SECS,
+ [TCP_CONNTRACK_SYN_SENT2] = 2 MINS,
};
#define sNO TCP_CONNTRACK_NONE
#define sLA TCP_CONNTRACK_LAST_ACK
#define sTW TCP_CONNTRACK_TIME_WAIT
#define sCL TCP_CONNTRACK_CLOSE
-#define sLI TCP_CONNTRACK_LISTEN
+#define sS2 TCP_CONNTRACK_SYN_SENT2
#define sIV TCP_CONNTRACK_MAX
#define sIG TCP_CONNTRACK_IGNORE
*
* NONE: initial state
* SYN_SENT: SYN-only packet seen
+ * SYN_SENT2: SYN-only packet seen from reply dir, simultaneous open
* SYN_RECV: SYN-ACK packet seen
* ESTABLISHED: ACK packet seen
* FIN_WAIT: FIN packet seen
* TIME_WAIT: last ACK seen
* CLOSE: closed connection (RST)
*
- * LISTEN state is not used.
- *
* Packets marked as IGNORED (sIG):
* if they may be either invalid or valid
* and the receiver may send back a connection
* closing RST or a SYN/ACK.
*
* Packets marked as INVALID (sIV):
- * if they are invalid
- * or we do not support the request (simultaneous open)
+ * if we regard them as truly invalid packets
*/
static const u8 tcp_conntracks[2][6][TCP_CONNTRACK_MAX] = {
{
/* ORIGINAL */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*syn*/ { sSS, sSS, sIG, sIG, sIG, sIG, sIG, sSS, sSS, sS2 },
/*
* sNO -> sSS Initialize a new connection
* sSS -> sSS Retransmitted SYN
- * sSR -> sIG Late retransmitted SYN?
+ * sS2 -> sS2 Late retransmitted SYN
+ * sSR -> sIG
* sES -> sIG Error: SYNs in window outside the SYN_SENT state
* are errors. Receiver will reply with RST
* and close the connection.
* sTW -> sSS Reopened connection (RFC 1122).
* sCL -> sSS
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*synack*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*synack*/ { sIV, sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, sSR },
/*
- * A SYN/ACK from the client is always invalid:
- * - either it tries to set up a simultaneous open, which is
- * not supported;
- * - or the firewall has just been inserted between the two hosts
- * during the session set-up. The SYN will be retransmitted
- * by the true client (or it'll time out).
+ * sNO -> sIV Too late and no reason to do anything
+ * sSS -> sIV Client can't send SYN and then SYN/ACK
+ * sS2 -> sSR SYN/ACK sent to SYN2 in simultaneous open
+ * sSR -> sIG
+ * sES -> sIG Error: SYNs in window outside the SYN_SENT state
+ * are errors. Receiver will reply with RST
+ * and close the connection.
+ * Or we are not in sync and hold a dead connection.
+ * sFW -> sIG
+ * sCW -> sIG
+ * sLA -> sIG
+ * sTW -> sIG
+ * sCL -> sIG
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
/*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
/*
* sNO -> sIV Too late and no reason to do anything...
* sSS -> sIV Client migth not send FIN in this state:
* we enforce waiting for a SYN/ACK reply first.
+ * sS2 -> sIV
* sSR -> sFW Close started.
* sES -> sFW
* sFW -> sLA FIN seen in both directions, waiting for
* sTW -> sTW
* sCL -> sCL
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
/*ack*/ { sES, sIV, sES, sES, sCW, sCW, sTW, sTW, sCL, sIV },
/*
* sNO -> sES Assumed.
* sSS -> sIV ACK is invalid: we haven't seen a SYN/ACK yet.
+ * sS2 -> sIV
* sSR -> sES Established state is reached.
* sES -> sES :-)
* sFW -> sCW Normal close request answered by ACK.
* sTW -> sTW Retransmitted last ACK. Remain in the same state.
* sCL -> sCL
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL },
/*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
},
{
/* REPLY */
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*syn*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*syn*/ { sIV, sS2, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sS2 },
/*
* sNO -> sIV Never reached.
- * sSS -> sIV Simultaneous open, not supported
- * sSR -> sIV Simultaneous open, not supported.
- * sES -> sIV Server may not initiate a connection.
+ * sSS -> sS2 Simultaneous open
+ * sS2 -> sS2 Retransmitted simultaneous SYN
+ * sSR -> sIV Invalid SYN packets sent by the server
+ * sES -> sIV
* sFW -> sIV
* sCW -> sIV
* sLA -> sIV
* sTW -> sIV Reopened connection, but server may not do it.
* sCL -> sIV
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*synack*/ { sIV, sSR, sSR, sIG, sIG, sIG, sIG, sIG, sIG, sSR },
/*
* sSS -> sSR Standard open.
+ * sS2 -> sSR Simultaneous open
* sSR -> sSR Retransmitted SYN/ACK.
* sES -> sIG Late retransmitted SYN/ACK?
* sFW -> sIG Might be SYN/ACK answering ignored SYN
* sTW -> sIG
* sCL -> sIG
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
/*fin*/ { sIV, sIV, sFW, sFW, sLA, sLA, sLA, sTW, sCL, sIV },
/*
* sSS -> sIV Server might not send FIN in this state.
+ * sS2 -> sIV
* sSR -> sFW Close started.
* sES -> sFW
* sFW -> sLA FIN seen in both directions.
* sTW -> sTW
* sCL -> sCL
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIG },
/*
* sSS -> sIG Might be a half-open connection.
+ * sS2 -> sIG
* sSR -> sSR Might answer late resent SYN.
* sES -> sES :-)
* sFW -> sCW Normal close request answered by ACK.
* sTW -> sTW Retransmitted last ACK.
* sCL -> sCL
*/
-/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sIV },
+/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sS2 */
+/*rst*/ { sIV, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL, sCL },
/*none*/ { sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV, sIV }
}
};
-static int tcp_pkt_to_tuple(const struct sk_buff *skb,
- unsigned int dataoff,
- struct nf_conntrack_tuple *tuple)
+static bool tcp_pkt_to_tuple(const struct sk_buff *skb, unsigned int dataoff,
+ struct nf_conntrack_tuple *tuple)
{
const struct tcphdr *hp;
struct tcphdr _hdr;
/* Actually only need first 8 bytes. */
hp = skb_header_pointer(skb, dataoff, 8, &_hdr);
if (hp == NULL)
- return 0;
+ return false;
tuple->src.u.tcp.port = hp->source;
tuple->dst.u.tcp.port = hp->dest;
- return 1;
+ return true;
}
-static int tcp_invert_tuple(struct nf_conntrack_tuple *tuple,
- const struct nf_conntrack_tuple *orig)
+static bool tcp_invert_tuple(struct nf_conntrack_tuple *tuple,
+ const struct nf_conntrack_tuple *orig)
{
tuple->src.u.tcp.port = orig->dst.u.tcp.port;
tuple->dst.u.tcp.port = orig->src.u.tcp.port;
- return 1;
+ return true;
}
/* Print out the per-protocol part of the tuple. */
}
/* Print out the private part of the conntrack. */
-static int tcp_print_conntrack(struct seq_file *s, const struct nf_conn *ct)
+static int tcp_print_conntrack(struct seq_file *s, struct nf_conn *ct)
{
enum tcp_conntrack state;
- read_lock_bh(&tcp_lock);
+ spin_lock_bh(&ct->lock);
state = ct->proto.tcp.state;
- read_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
return seq_printf(s, "%s ", tcp_conntrack_names[state]);
}
I. Upper bound for valid data: seq <= sender.td_maxend
II. Lower bound for valid data: seq + len >= sender.td_end - receiver.td_maxwin
- III. Upper bound for valid ack: sack <= receiver.td_end
- IV. Lower bound for valid ack: ack >= receiver.td_end - MAXACKWINDOW
+ III. Upper bound for valid (s)ack: sack <= receiver.td_end
+ IV. Lower bound for valid (s)ack: sack >= receiver.td_end - MAXACKWINDOW
- where sack is the highest right edge of sack block found in the packet.
+ where sack is the highest right edge of sack block found in the packet
+ or ack in the case of packet without SACK option.
- The upper bound limit for a valid ack is not ignored -
+ The upper bound limit for a valid (s)ack is not ignored -
we doesn't have to deal with fragments.
*/
for (i = 0;
i < (opsize - TCPOLEN_SACK_BASE);
i += TCPOLEN_SACK_PERBLOCK) {
- tmp = ntohl(*((__be32 *)(ptr+i)+1));
+ tmp = get_unaligned_be32((__be32 *)(ptr+i)+1);
if (after(tmp, *sack))
*sack = tmp;
}
}
-static int tcp_in_window(const struct nf_conn *ct,
- struct ip_ct_tcp *state,
- enum ip_conntrack_dir dir,
- unsigned int index,
- const struct sk_buff *skb,
- unsigned int dataoff,
- const struct tcphdr *tcph,
- int pf)
+static bool tcp_in_window(const struct nf_conn *ct,
+ struct ip_ct_tcp *state,
+ enum ip_conntrack_dir dir,
+ unsigned int index,
+ const struct sk_buff *skb,
+ unsigned int dataoff,
+ const struct tcphdr *tcph,
+ u_int8_t pf)
{
+ struct net *net = nf_ct_net(ct);
struct ip_ct_tcp_state *sender = &state->seen[dir];
struct ip_ct_tcp_state *receiver = &state->seen[!dir];
const struct nf_conntrack_tuple *tuple = &ct->tuplehash[dir].tuple;
__u32 seq, ack, sack, end, win, swin;
- int res;
+ bool res;
/*
* Get the required data from the packet.
pr_debug("tcp_in_window: START\n");
pr_debug("tcp_in_window: ");
- NF_CT_DUMP_TUPLE(tuple);
+ nf_ct_dump_tuple(tuple);
pr_debug("seq=%u ack=%u sack=%u win=%u end=%u\n",
seq, ack, sack, win, end);
pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
- if (sender->td_end == 0) {
+ if (sender->td_maxwin == 0) {
/*
* Initialize sender data.
*/
- if (tcph->syn && tcph->ack) {
+ if (tcph->syn) {
/*
- * Outgoing SYN-ACK in reply to a SYN.
+ * SYN-ACK in reply to a SYN
+ * or SYN from reply direction in simultaneous open.
*/
sender->td_end =
sender->td_maxend = end;
&& receiver->flags & IP_CT_TCP_FLAG_WINDOW_SCALE))
sender->td_scale =
receiver->td_scale = 0;
+ if (!tcph->ack)
+ /* Simultaneous open */
+ return true;
} else {
/*
* We are in the middle of a connection,
seq = end = sender->td_end;
pr_debug("tcp_in_window: ");
- NF_CT_DUMP_TUPLE(tuple);
+ nf_ct_dump_tuple(tuple);
pr_debug("seq=%u ack=%u sack =%u win=%u end=%u\n",
seq, ack, sack, win, end);
pr_debug("tcp_in_window: sender end=%u maxend=%u maxwin=%u scale=%i "
before(seq, sender->td_maxend + 1),
after(end, sender->td_end - receiver->td_maxwin - 1),
before(sack, receiver->td_end + 1),
- after(ack, receiver->td_end - MAXACKWINDOW(sender)));
+ after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1));
if (before(seq, sender->td_maxend + 1) &&
after(end, sender->td_end - receiver->td_maxwin - 1) &&
before(sack, receiver->td_end + 1) &&
- after(ack, receiver->td_end - MAXACKWINDOW(sender))) {
+ after(sack, receiver->td_end - MAXACKWINDOW(sender) - 1)) {
/*
* Take into account window scaling (RFC 1323).
*/
swin = win + (sack - ack);
if (sender->td_maxwin < swin)
sender->td_maxwin = swin;
- if (after(end, sender->td_end))
+ if (after(end, sender->td_end)) {
sender->td_end = end;
+ sender->flags |= IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
+ }
+ if (tcph->ack) {
+ if (!(sender->flags & IP_CT_TCP_FLAG_MAXACK_SET)) {
+ sender->td_maxack = ack;
+ sender->flags |= IP_CT_TCP_FLAG_MAXACK_SET;
+ } else if (after(ack, sender->td_maxack))
+ sender->td_maxack = ack;
+ }
+
/*
* Update receiver data.
*/
if (win == 0)
receiver->td_maxend++;
}
+ if (ack == receiver->td_end)
+ receiver->flags &= ~IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED;
/*
* Check retransmissions.
state->retrans = 0;
}
}
- res = 1;
+ res = true;
} else {
- res = 0;
+ res = false;
if (sender->flags & IP_CT_TCP_FLAG_BE_LIBERAL ||
nf_ct_tcp_be_liberal)
- res = 1;
- if (!res && LOG_INVALID(IPPROTO_TCP))
+ res = true;
+ if (!res && LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: %s ",
before(seq, sender->td_maxend + 1) ?
: "SEQ is over the upper bound (over the window of the receiver)");
}
- pr_debug("tcp_in_window: res=%i sender end=%u maxend=%u maxwin=%u "
+ pr_debug("tcp_in_window: res=%u sender end=%u maxend=%u maxwin=%u "
"receiver end=%u maxend=%u maxwin=%u\n",
res, sender->td_end, sender->td_maxend, sender->td_maxwin,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin);
end = segment_seq_plus_len(ntohl(tcph->seq), skb->len, dataoff, tcph);
- write_lock_bh(&tcp_lock);
+ spin_lock_bh(&ct->lock);
/*
* We have to worry for the ack in the reply packet only...
*/
if (after(end, ct->proto.tcp.seen[dir].td_end))
ct->proto.tcp.seen[dir].td_end = end;
ct->proto.tcp.last_end = end;
- write_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
pr_debug("tcp_update: sender end=%u maxend=%u maxwin=%u scale=%i "
"receiver end=%u maxend=%u maxwin=%u scale=%i\n",
sender->td_end, sender->td_maxend, sender->td_maxwin,
};
/* Protect conntrack agaist broken packets. Code taken from ipt_unclean.c. */
-static int tcp_error(struct sk_buff *skb,
+static int tcp_error(struct net *net,
+ struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info *ctinfo,
- int pf,
+ u_int8_t pf,
unsigned int hooknum)
{
const struct tcphdr *th;
/* Smaller that minimal TCP header? */
th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
if (th == NULL) {
- if (LOG_INVALID(IPPROTO_TCP))
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: short packet ");
return -NF_ACCEPT;
/* Not whole TCP header or malformed packet */
if (th->doff*4 < sizeof(struct tcphdr) || tcplen < th->doff*4) {
- if (LOG_INVALID(IPPROTO_TCP))
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: truncated/malformed packet ");
return -NF_ACCEPT;
* because the checksum is assumed to be correct.
*/
/* FIXME: Source route IP option packets --RR */
- if (nf_conntrack_checksum && hooknum == NF_INET_PRE_ROUTING &&
+ if (net->ct.sysctl_checksum && hooknum == NF_INET_PRE_ROUTING &&
nf_checksum(skb, hooknum, dataoff, IPPROTO_TCP, pf)) {
- if (LOG_INVALID(IPPROTO_TCP))
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: bad TCP checksum ");
return -NF_ACCEPT;
/* Check TCP flags. */
tcpflags = (((u_int8_t *)th)[13] & ~(TH_ECE|TH_CWR|TH_PUSH));
if (!tcp_valid_flags[tcpflags]) {
- if (LOG_INVALID(IPPROTO_TCP))
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: invalid TCP flag combination ");
return -NF_ACCEPT;
const struct sk_buff *skb,
unsigned int dataoff,
enum ip_conntrack_info ctinfo,
- int pf,
+ u_int8_t pf,
unsigned int hooknum)
{
+ struct net *net = nf_ct_net(ct);
struct nf_conntrack_tuple *tuple;
enum tcp_conntrack new_state, old_state;
enum ip_conntrack_dir dir;
th = skb_header_pointer(skb, dataoff, sizeof(_tcph), &_tcph);
BUG_ON(th == NULL);
- write_lock_bh(&tcp_lock);
+ spin_lock_bh(&ct->lock);
old_state = ct->proto.tcp.state;
dir = CTINFO2DIR(ctinfo);
index = get_conntrack_index(th);
&& ct->proto.tcp.last_index == TCP_RST_SET)) {
/* Attempt to reopen a closed/aborted connection.
* Delete this connection and look up again. */
- write_unlock_bh(&tcp_lock);
- if (del_timer(&ct->timeout))
- ct->timeout.function((unsigned long)ct);
- return -NF_REPEAT;
+ spin_unlock_bh(&ct->lock);
+
+ /* Only repeat if we can actually remove the timer.
+ * Destruction may already be in progress in process
+ * context and we must give it a chance to terminate.
+ */
+ if (nf_ct_kill(ct))
+ return -NF_REPEAT;
+ return NF_DROP;
}
/* Fall through */
case TCP_CONNTRACK_IGNORE:
* that the client cannot but retransmit its SYN and
* thus initiate a clean new session.
*/
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
+ spin_unlock_bh(&ct->lock);
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: killing out of sync session ");
- if (del_timer(&ct->timeout))
- ct->timeout.function((unsigned long)ct);
- return -NF_DROP;
+ nf_ct_kill(ct);
+ return NF_DROP;
}
ct->proto.tcp.last_index = index;
ct->proto.tcp.last_dir = dir;
ct->proto.tcp.last_end =
segment_seq_plus_len(ntohl(th->seq), skb->len, dataoff, th);
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
+ spin_unlock_bh(&ct->lock);
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: invalid packet ignored ");
return NF_ACCEPT;
/* Invalid packet */
pr_debug("nf_ct_tcp: Invalid dir=%i index=%u ostate=%u\n",
dir, get_conntrack_index(th), old_state);
- write_unlock_bh(&tcp_lock);
- if (LOG_INVALID(IPPROTO_TCP))
+ spin_unlock_bh(&ct->lock);
+ if (LOG_INVALID(net, IPPROTO_TCP))
nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
"nf_ct_tcp: invalid state ");
return -NF_ACCEPT;
case TCP_CONNTRACK_CLOSE:
if (index == TCP_RST_SET
+ && (ct->proto.tcp.seen[!dir].flags & IP_CT_TCP_FLAG_MAXACK_SET)
+ && before(ntohl(th->seq), ct->proto.tcp.seen[!dir].td_maxack)) {
+ /* Invalid RST */
+ write_unlock_bh(&tcp_lock);
+ if (LOG_INVALID(net, IPPROTO_TCP))
+ nf_log_packet(pf, 0, skb, NULL, NULL, NULL,
+ "nf_ct_tcp: invalid RST ");
+ return -NF_ACCEPT;
+ }
+ if (index == TCP_RST_SET
&& ((test_bit(IPS_SEEN_REPLY_BIT, &ct->status)
&& ct->proto.tcp.last_index == TCP_SYN_SET)
|| (!test_bit(IPS_ASSURED_BIT, &ct->status)
if (!tcp_in_window(ct, &ct->proto.tcp, dir, index,
skb, dataoff, th, pf)) {
- write_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
return -NF_ACCEPT;
}
in_window:
ct->proto.tcp.last_dir = dir;
pr_debug("tcp_conntracks: ");
- NF_CT_DUMP_TUPLE(tuple);
+ nf_ct_dump_tuple(tuple);
pr_debug("syn=%i ack=%i fin=%i rst=%i old=%i new=%i\n",
(th->syn ? 1 : 0), (th->ack ? 1 : 0),
(th->fin ? 1 : 0), (th->rst ? 1 : 0),
ct->proto.tcp.state = new_state;
if (old_state != new_state
- && new_state == TCP_CONNTRACK_CLOSE)
+ && new_state == TCP_CONNTRACK_FIN_WAIT)
ct->proto.tcp.seen[dir].flags |= IP_CT_TCP_FLAG_CLOSE_INIT;
- timeout = ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans
- && tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans
- ? nf_ct_tcp_timeout_max_retrans : tcp_timeouts[new_state];
- write_unlock_bh(&tcp_lock);
- nf_conntrack_event_cache(IPCT_PROTOINFO_VOLATILE, skb);
+ if (ct->proto.tcp.retrans >= nf_ct_tcp_max_retrans &&
+ tcp_timeouts[new_state] > nf_ct_tcp_timeout_max_retrans)
+ timeout = nf_ct_tcp_timeout_max_retrans;
+ else if ((ct->proto.tcp.seen[0].flags | ct->proto.tcp.seen[1].flags) &
+ IP_CT_TCP_FLAG_DATA_UNACKNOWLEDGED &&
+ tcp_timeouts[new_state] > nf_ct_tcp_timeout_unacknowledged)
+ timeout = nf_ct_tcp_timeout_unacknowledged;
+ else
+ timeout = tcp_timeouts[new_state];
+ spin_unlock_bh(&ct->lock);
+
if (new_state != old_state)
- nf_conntrack_event_cache(IPCT_PROTOINFO, skb);
+ nf_conntrack_event_cache(IPCT_PROTOINFO, ct);
if (!test_bit(IPS_SEEN_REPLY_BIT, &ct->status)) {
/* If only reply is a RST, we can consider ourselves not to
problem case, so we can delete the conntrack
immediately. --RR */
if (th->rst) {
- if (del_timer(&ct->timeout))
- ct->timeout.function((unsigned long)ct);
+ nf_ct_kill_acct(ct, ctinfo, skb);
return NF_ACCEPT;
}
} else if (!test_bit(IPS_ASSURED_BIT, &ct->status)
after SYN_RECV or a valid answer for a picked up
connection. */
set_bit(IPS_ASSURED_BIT, &ct->status);
- nf_conntrack_event_cache(IPCT_STATUS, skb);
+ nf_conntrack_event_cache(IPCT_STATUS, ct);
}
nf_ct_refresh_acct(ct, ctinfo, skb, timeout);
}
/* Called when a new connection for this protocol found. */
-static int tcp_new(struct nf_conn *ct,
- const struct sk_buff *skb,
- unsigned int dataoff)
+static bool tcp_new(struct nf_conn *ct, const struct sk_buff *skb,
+ unsigned int dataoff)
{
enum tcp_conntrack new_state;
const struct tcphdr *th;
/* Invalid: delete conntrack */
if (new_state >= TCP_CONNTRACK_MAX) {
pr_debug("nf_ct_tcp: invalid new deleting.\n");
- return 0;
+ return false;
}
if (new_state == TCP_CONNTRACK_SYN_SENT) {
ct->proto.tcp.seen[1].flags = 0;
} else if (nf_ct_tcp_loose == 0) {
/* Don't try to pick up connections. */
- return 0;
+ return false;
} else {
/*
* We are in the middle of a connection,
ct->proto.tcp.seen[1].td_end = 0;
ct->proto.tcp.seen[1].td_maxend = 0;
- ct->proto.tcp.seen[1].td_maxwin = 1;
+ ct->proto.tcp.seen[1].td_maxwin = 0;
ct->proto.tcp.seen[1].td_scale = 0;
/* tcp_packet will set them */
sender->td_scale,
receiver->td_end, receiver->td_maxend, receiver->td_maxwin,
receiver->td_scale);
- return 1;
+ return true;
}
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
#include <linux/netfilter/nfnetlink_conntrack.h>
static int tcp_to_nlattr(struct sk_buff *skb, struct nlattr *nla,
- const struct nf_conn *ct)
+ struct nf_conn *ct)
{
struct nlattr *nest_parms;
struct nf_ct_tcp_flags tmp = {};
- read_lock_bh(&tcp_lock);
+ spin_lock_bh(&ct->lock);
nest_parms = nla_nest_start(skb, CTA_PROTOINFO_TCP | NLA_F_NESTED);
if (!nest_parms)
goto nla_put_failure;
tmp.flags = ct->proto.tcp.seen[1].flags;
NLA_PUT(skb, CTA_PROTOINFO_TCP_FLAGS_REPLY,
sizeof(struct nf_ct_tcp_flags), &tmp);
- read_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
nla_nest_end(skb, nest_parms);
return 0;
nla_put_failure:
- read_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
return -1;
}
if (err < 0)
return err;
- if (!tb[CTA_PROTOINFO_TCP_STATE])
+ if (tb[CTA_PROTOINFO_TCP_STATE] &&
+ nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]) >= TCP_CONNTRACK_MAX)
return -EINVAL;
- write_lock_bh(&tcp_lock);
- ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]);
+ spin_lock_bh(&ct->lock);
+ if (tb[CTA_PROTOINFO_TCP_STATE])
+ ct->proto.tcp.state = nla_get_u8(tb[CTA_PROTOINFO_TCP_STATE]);
if (tb[CTA_PROTOINFO_TCP_FLAGS_ORIGINAL]) {
struct nf_ct_tcp_flags *attr =
ct->proto.tcp.seen[1].td_scale =
nla_get_u8(tb[CTA_PROTOINFO_TCP_WSCALE_REPLY]);
}
- write_unlock_bh(&tcp_lock);
+ spin_unlock_bh(&ct->lock);
return 0;
}
+
+static int tcp_nlattr_size(void)
+{
+ return nla_total_size(0) /* CTA_PROTOINFO_TCP */
+ + nla_policy_len(tcp_nla_policy, CTA_PROTOINFO_TCP_MAX + 1);
+}
+
+static int tcp_nlattr_tuple_size(void)
+{
+ return nla_policy_len(nf_ct_port_nla_policy, CTA_PROTO_MAX + 1);
+}
#endif
#ifdef CONFIG_SYSCTL
.data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_syn_recv",
.data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_established",
.data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_fin_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_close_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_last_ack",
.data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_time_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_close",
.data = &tcp_timeouts[TCP_CONNTRACK_CLOSE],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "nf_conntrack_tcp_timeout_max_retrans",
.data = &nf_ct_tcp_timeout_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "nf_conntrack_tcp_timeout_unacknowledged",
+ .data = &nf_ct_tcp_timeout_unacknowledged,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_LOOSE,
.data = &nf_ct_tcp_loose,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_BE_LIBERAL,
.data = &nf_ct_tcp_be_liberal,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = NET_NF_CONNTRACK_TCP_MAX_RETRANS,
.data = &nf_ct_tcp_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = 0
.data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
+ },
+ {
+ .procname = "ip_conntrack_tcp_timeout_syn_sent2",
+ .data = &tcp_timeouts[TCP_CONNTRACK_SYN_SENT2],
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_syn_recv",
.data = &tcp_timeouts[TCP_CONNTRACK_SYN_RECV],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_established",
.data = &tcp_timeouts[TCP_CONNTRACK_ESTABLISHED],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_fin_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_FIN_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_close_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_CLOSE_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_last_ack",
.data = &tcp_timeouts[TCP_CONNTRACK_LAST_ACK],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_time_wait",
.data = &tcp_timeouts[TCP_CONNTRACK_TIME_WAIT],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_close",
.data = &tcp_timeouts[TCP_CONNTRACK_CLOSE],
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.procname = "ip_conntrack_tcp_timeout_max_retrans",
.data = &nf_ct_tcp_timeout_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec_jiffies,
+ .proc_handler = proc_dointvec_jiffies,
},
{
.ctl_name = NET_IPV4_NF_CONNTRACK_TCP_LOOSE,
.data = &nf_ct_tcp_loose,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = NET_IPV4_NF_CONNTRACK_TCP_BE_LIBERAL,
.data = &nf_ct_tcp_be_liberal,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = NET_IPV4_NF_CONNTRACK_TCP_MAX_RETRANS,
.data = &nf_ct_tcp_max_retrans,
.maxlen = sizeof(unsigned int),
.mode = 0644,
- .proc_handler = &proc_dointvec,
+ .proc_handler = proc_dointvec,
},
{
.ctl_name = 0
.error = tcp_error,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nlattr = tcp_to_nlattr,
+ .nlattr_size = tcp_nlattr_size,
.from_nlattr = nlattr_to_tcp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
+ .nlattr_tuple_size = tcp_nlattr_tuple_size,
.nla_policy = nf_ct_port_nla_policy,
#endif
#ifdef CONFIG_SYSCTL
.error = tcp_error,
#if defined(CONFIG_NF_CT_NETLINK) || defined(CONFIG_NF_CT_NETLINK_MODULE)
.to_nlattr = tcp_to_nlattr,
+ .nlattr_size = tcp_nlattr_size,
.from_nlattr = nlattr_to_tcp,
.tuple_to_nlattr = nf_ct_port_tuple_to_nlattr,
.nlattr_to_tuple = nf_ct_port_nlattr_to_tuple,
+ .nlattr_tuple_size = tcp_nlattr_tuple_size,
.nla_policy = nf_ct_port_nla_policy,
#endif
#ifdef CONFIG_SYSCTL
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff