#define HOURS * 60 MINS
#define DAYS * 24 HOURS
-unsigned long nf_ct_tcp_timeout_syn_sent = 2 MINS;
-unsigned long nf_ct_tcp_timeout_syn_recv = 60 SECS;
-unsigned long nf_ct_tcp_timeout_established = 5 DAYS;
-unsigned long nf_ct_tcp_timeout_fin_wait = 2 MINS;
-unsigned long nf_ct_tcp_timeout_close_wait = 60 SECS;
-unsigned long nf_ct_tcp_timeout_last_ack = 30 SECS;
-unsigned long nf_ct_tcp_timeout_time_wait = 2 MINS;
-unsigned long nf_ct_tcp_timeout_close = 10 SECS;
+unsigned int nf_ct_tcp_timeout_syn_sent = 2 MINS;
+unsigned int nf_ct_tcp_timeout_syn_recv = 60 SECS;
+unsigned int nf_ct_tcp_timeout_established = 5 DAYS;
+unsigned int nf_ct_tcp_timeout_fin_wait = 2 MINS;
+unsigned int nf_ct_tcp_timeout_close_wait = 60 SECS;
+unsigned int nf_ct_tcp_timeout_last_ack = 30 SECS;
+unsigned int nf_ct_tcp_timeout_time_wait = 2 MINS;
+unsigned int nf_ct_tcp_timeout_close = 10 SECS;
/* 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. */
-unsigned long nf_ct_tcp_timeout_max_retrans = 5 MINS;
+unsigned int nf_ct_tcp_timeout_max_retrans = 5 MINS;
-static unsigned long * tcp_timeouts[]
+static unsigned int * tcp_timeouts[]
= { NULL, /* TCP_CONNTRACK_NONE */
&nf_ct_tcp_timeout_syn_sent, /* TCP_CONNTRACK_SYN_SENT, */
&nf_ct_tcp_timeout_syn_recv, /* TCP_CONNTRACK_SYN_RECV, */
* sCL -> sCL
*/
/* sNO, sSS, sSR, sES, sFW, sCW, sLA, sTW, sCL, sLI */
-/*ack*/ { sIV, sIV, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
+/*ack*/ { sIV, sIG, sSR, sES, sCW, sCW, sTW, sTW, sCL, sIV },
/*
- * sSS -> sIV Might be a half-open connection.
+ * sSS -> sIG Might be a half-open connection.
* sSR -> sSR Might answer late resent SYN.
* sES -> sES :-)
* sFW -> sCW Normal close request answered by ACK.
{
return csum_ipv6_magic(&skb->nh.ipv6h->saddr, &skb->nh.ipv6h->daddr,
skb->len - dataoff, IPPROTO_TCP,
- skb->ip_summed == CHECKSUM_HW ? skb->csum
+ skb->ip_summed == CHECKSUM_HW
+ ? csum_sub(skb->csum,
+ skb_checksum(skb, 0, dataoff, 0))
: skb_checksum(skb, dataoff, skb->len - dataoff,
0));
}
switch (new_state) {
case TCP_CONNTRACK_IGNORE:
- /* Either SYN in ORIGINAL
- * or SYN/ACK in REPLY. */
+ /* Ignored packets:
+ *
+ * a) SYN in ORIGINAL
+ * b) SYN/ACK in REPLY
+ * c) ACK in reply direction after initial SYN in original.
+ */
if (index == TCP_SYNACK_SET
&& conntrack->proto.tcp.last_index == TCP_SYN_SET
&& conntrack->proto.tcp.last_dir != dir
conntrack->timeout.function((unsigned long)
conntrack);
return -NF_REPEAT;
+ } else {
+ write_unlock_bh(&tcp_lock);
+ if (LOG_INVALID(IPPROTO_TCP))
+ nf_log_packet(pf, 0, skb, NULL, NULL,
+ NULL, "nf_ct_tcp: invalid SYN");
+ return -NF_ACCEPT;
}
case TCP_CONNTRACK_CLOSE:
if (index == TCP_RST_SET
- && test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
- && conntrack->proto.tcp.last_index == TCP_SYN_SET
+ && ((test_bit(IPS_SEEN_REPLY_BIT, &conntrack->status)
+ && conntrack->proto.tcp.last_index == TCP_SYN_SET)
+ || (!test_bit(IPS_ASSURED_BIT, &conntrack->status)
+ && conntrack->proto.tcp.last_index == TCP_ACK_SET))
&& ntohl(th->ack_seq) == conntrack->proto.tcp.last_end) {
- /* RST sent to invalid SYN we had let trough
- * SYN was in window then, tear down connection.
+ /* RST sent to invalid SYN or ACK we had let through
+ * at a) and c) above:
+ *
+ * a) SYN was in window then
+ * c) we hold a half-open connection.
+ *
+ * Delete our connection entry.
* We skip window checking, because packet might ACK
- * segments we ignored in the SYN. */
+ * segments we ignored. */
goto in_window;
}
- /* Just fall trough */
+ /* Just fall through */
default:
/* Keep compilers happy. */
break;
receiver->td_scale);
return 1;
}
+
+#if defined(CONFIG_NF_CT_NETLINK) || \
+ defined(CONFIG_NF_CT_NETLINK_MODULE)
+
+#include <linux/netfilter/nfnetlink.h>
+#include <linux/netfilter/nfnetlink_conntrack.h>
+
+static int tcp_to_nfattr(struct sk_buff *skb, struct nfattr *nfa,
+ const struct nf_conn *ct)
+{
+ struct nfattr *nest_parms;
+
+ read_lock_bh(&tcp_lock);
+ nest_parms = NFA_NEST(skb, CTA_PROTOINFO_TCP);
+ NFA_PUT(skb, CTA_PROTOINFO_TCP_STATE, sizeof(u_int8_t),
+ &ct->proto.tcp.state);
+ read_unlock_bh(&tcp_lock);
+
+ NFA_NEST_END(skb, nest_parms);
+
+ return 0;
+
+nfattr_failure:
+ read_unlock_bh(&tcp_lock);
+ return -1;
+}
+
+static const size_t cta_min_tcp[CTA_PROTOINFO_TCP_MAX] = {
+ [CTA_PROTOINFO_TCP_STATE-1] = sizeof(u_int8_t),
+};
+
+static int nfattr_to_tcp(struct nfattr *cda[], struct nf_conn *ct)
+{
+ struct nfattr *attr = cda[CTA_PROTOINFO_TCP-1];
+ struct nfattr *tb[CTA_PROTOINFO_TCP_MAX];
+
+ /* updates could not contain anything about the private
+ * protocol info, in that case skip the parsing */
+ if (!attr)
+ return 0;
+
+ nfattr_parse_nested(tb, CTA_PROTOINFO_TCP_MAX, attr);
+
+ if (nfattr_bad_size(tb, CTA_PROTOINFO_TCP_MAX, cta_min_tcp))
+ return -EINVAL;
+
+ if (!tb[CTA_PROTOINFO_TCP_STATE-1])
+ return -EINVAL;
+
+ write_lock_bh(&tcp_lock);
+ ct->proto.tcp.state =
+ *(u_int8_t *)NFA_DATA(tb[CTA_PROTOINFO_TCP_STATE-1]);
+ write_unlock_bh(&tcp_lock);
+
+ return 0;
+}
+#endif
struct nf_conntrack_protocol nf_conntrack_protocol_tcp4 =
{
.packet = tcp_packet,
.new = tcp_new,
.error = tcp_error4,
+#if defined(CONFIG_NF_CT_NETLINK) || \
+ defined(CONFIG_NF_CT_NETLINK_MODULE)
+ .to_nfattr = tcp_to_nfattr,
+ .from_nfattr = nfattr_to_tcp,
+ .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
+ .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
+#endif
};
struct nf_conntrack_protocol nf_conntrack_protocol_tcp6 =
.packet = tcp_packet,
.new = tcp_new,
.error = tcp_error6,
+#if defined(CONFIG_NF_CT_NETLINK) || \
+ defined(CONFIG_NF_CT_NETLINK_MODULE)
+ .to_nfattr = tcp_to_nfattr,
+ .from_nfattr = nfattr_to_tcp,
+ .tuple_to_nfattr = nf_ct_port_tuple_to_nfattr,
+ .nfattr_to_tuple = nf_ct_port_nfattr_to_tuple,
+#endif
};
EXPORT_SYMBOL(nf_conntrack_protocol_tcp4);
projects / powerpc.git / blobdiff