Merge remote-tracking branch 'regulator/topic/core' into regulator-linus

[cascardo/linux.git] / net / netfilter / nf_nat_irc.c

diff --git a/net/netfilter/nf_nat_irc.c b/net/netfilter/nf_nat_irc.c
index f02b360..1fb2258 100644 (file)
--- a/net/netfilter/nf_nat_irc.c
+++ b/net/netfilter/nf_nat_irc.c
@@ -34,10 +34,14 @@ static unsigned int help(struct sk_buff *skb,
                         struct nf_conntrack_expect *exp)
 {
        char buffer[sizeof("4294967296 65635")];
+       struct nf_conn *ct = exp->master;
+       union nf_inet_addr newaddr;
        u_int16_t port;
        unsigned int ret;
 
        /* Reply comes from server. */
+       newaddr = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.u3;
+
        exp->saved_proto.tcp.port = exp->tuple.dst.u.tcp.port;
        exp->dir = IP_CT_DIR_REPLY;
        exp->expectfn = nf_nat_follow_master;
@@ -57,17 +61,35 @@ static unsigned int help(struct sk_buff *skb,
        }
 
        if (port == 0) {
-               nf_ct_helper_log(skb, exp->master, "all ports in use");
+               nf_ct_helper_log(skb, ct, "all ports in use");
                return NF_DROP;
        }
 
-       ret = nf_nat_mangle_tcp_packet(skb, exp->master, ctinfo,
-                                      protoff, matchoff, matchlen, buffer,
-                                      strlen(buffer));
+       /* strlen("\1DCC CHAT chat AAAAAAAA P\1\n")=27
+        * strlen("\1DCC SCHAT chat AAAAAAAA P\1\n")=28
+        * strlen("\1DCC SEND F AAAAAAAA P S\1\n")=26
+        * strlen("\1DCC MOVE F AAAAAAAA P S\1\n")=26
+        * strlen("\1DCC TSEND F AAAAAAAA P S\1\n")=27
+        *
+        * AAAAAAAAA: bound addr (1.0.0.0==16777216, min 8 digits,
+        *                        255.255.255.255==4294967296, 10 digits)
+        * P:         bound port (min 1 d, max 5d (65635))
+        * F:         filename   (min 1 d )
+        * S:         size       (min 1 d )
+        * 0x01, \n:  terminators
+        */
+       /* AAA = "us", ie. where server normally talks to. */
+       snprintf(buffer, sizeof(buffer), "%u %u", ntohl(newaddr.ip), port);
+       pr_debug("nf_nat_irc: inserting '%s' == %pI4, port %u\n",
+                buffer, &newaddr.ip, port);
+
+       ret = nf_nat_mangle_tcp_packet(skb, ct, ctinfo, protoff, matchoff,
+                                      matchlen, buffer, strlen(buffer));
        if (ret != NF_ACCEPT) {
-               nf_ct_helper_log(skb, exp->master, "cannot mangle packet");
+               nf_ct_helper_log(skb, ct, "cannot mangle packet");
                nf_ct_unexpect_related(exp);
        }
+
        return ret;
 }