[NETFILTER]: PPTP conntrack: simplify expectation handling
Patrick McHardy [Wed, 20 Sep 2006 19:09:34 +0000 (12:09 -0700)]
Remove duplicated expectation handling in the NAT helper and simplify
the remains in the conntrack helper.

Signed-off-by: Patrick McHardy <kaber@trash.net>
Signed-off-by: David S. Miller <davem@davemloft.net>

include/linux/netfilter_ipv4/ip_conntrack_pptp.h
net/ipv4/netfilter/ip_conntrack_helper_pptp.c
net/ipv4/netfilter/ip_nat_helper_pptp.c

index 620bf06..2644b1f 100644 (file)
@@ -315,7 +315,7 @@ extern int
                          struct PptpControlHeader *ctlh,
                          union pptp_ctrl_union *pptpReq);
 
-extern int
+extern void
 (*ip_nat_pptp_hook_exp_gre)(struct ip_conntrack_expect *exp_orig,
                            struct ip_conntrack_expect *exp_reply);
 
index 5f7af6e..57eac6e 100644 (file)
@@ -80,7 +80,7 @@ int
                          struct PptpControlHeader *ctlh,
                          union pptp_ctrl_union *pptpReq);
 
-int
+void
 (*ip_nat_pptp_hook_exp_gre)(struct ip_conntrack_expect *expect_orig,
                            struct ip_conntrack_expect *expect_reply);
 
@@ -219,93 +219,63 @@ static void pptp_destroy_siblings(struct ip_conntrack *ct)
 
 /* expect GRE connections (PNS->PAC and PAC->PNS direction) */
 static inline int
-exp_gre(struct ip_conntrack *master,
+exp_gre(struct ip_conntrack *ct,
        __be16 callid,
        __be16 peer_callid)
 {
-       struct ip_conntrack_tuple inv_tuple;
-       struct ip_conntrack_tuple exp_tuples[] = {
-               /* tuple in original direction, PNS->PAC */
-               { .src = { .ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip,
-                          .u = { .gre = { .key = peer_callid } }
-                        },
-                 .dst = { .ip = master->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip,
-                          .u = { .gre = { .key = callid } },
-                          .protonum = IPPROTO_GRE
-                        },
-                },
-               /* tuple in reply direction, PAC->PNS */
-               { .src = { .ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip,
-                          .u = { .gre = { .key = callid } }
-                        },
-                 .dst = { .ip = master->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip,
-                          .u = { .gre = { .key = peer_callid } },
-                          .protonum = IPPROTO_GRE
-                        },
-                }
-       };
        struct ip_conntrack_expect *exp_orig, *exp_reply;
        int ret = 1;
 
-       exp_orig = ip_conntrack_expect_alloc(master);
+       exp_orig = ip_conntrack_expect_alloc(ct);
        if (exp_orig == NULL)
                goto out;
 
-       exp_reply = ip_conntrack_expect_alloc(master);
+       exp_reply = ip_conntrack_expect_alloc(ct);
        if (exp_reply == NULL)
                goto out_put_orig;
 
-       memcpy(&exp_orig->tuple, &exp_tuples[0], sizeof(exp_orig->tuple));
+       /* original direction, PNS->PAC */
+       exp_orig->tuple.src.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.src.ip;
+       exp_orig->tuple.src.u.gre.key = peer_callid;
+       exp_orig->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple.dst.ip;
+       exp_orig->tuple.dst.u.gre.key = callid;
+       exp_orig->tuple.dst.protonum = IPPROTO_GRE;
 
        exp_orig->mask.src.ip = 0xffffffff;
        exp_orig->mask.src.u.all = 0;
-       exp_orig->mask.dst.u.all = 0;
        exp_orig->mask.dst.u.gre.key = htons(0xffff);
        exp_orig->mask.dst.ip = 0xffffffff;
        exp_orig->mask.dst.protonum = 0xff;
 
-       exp_orig->master = master;
+       exp_orig->master = ct;
        exp_orig->expectfn = pptp_expectfn;
        exp_orig->flags = 0;
 
        /* both expectations are identical apart from tuple */
        memcpy(exp_reply, exp_orig, sizeof(*exp_reply));
-       memcpy(&exp_reply->tuple, &exp_tuples[1], sizeof(exp_reply->tuple));
-
-       if (ip_nat_pptp_hook_exp_gre)
-               ret = ip_nat_pptp_hook_exp_gre(exp_orig, exp_reply);
-       else {
 
-               DEBUGP("calling expect_related PNS->PAC");
-               DUMP_TUPLE(&exp_orig->tuple);
+       /* reply direction, PAC->PNS */
+       exp_reply->tuple.src.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.src.ip;
+       exp_reply->tuple.src.u.gre.key = callid;
+       exp_reply->tuple.dst.ip = ct->tuplehash[IP_CT_DIR_REPLY].tuple.dst.ip;
+       exp_reply->tuple.dst.u.gre.key = peer_callid;
+       exp_reply->tuple.dst.protonum = IPPROTO_GRE;
 
-               if (ip_conntrack_expect_related(exp_orig) != 0) {
-                       DEBUGP("cannot expect_related()\n");
-                       goto out_put_both;
-               }
-
-               DEBUGP("calling expect_related PAC->PNS");
-               DUMP_TUPLE(&exp_reply->tuple);
-
-               if (ip_conntrack_expect_related(exp_reply) != 0) {
-                       DEBUGP("cannot expect_related()\n");
-                       goto out_unexpect_orig;
-               }
-
-               /* Add GRE keymap entries */
-               if (ip_ct_gre_keymap_add(master, &exp_reply->tuple, 0) != 0) {
-                       DEBUGP("cannot keymap_add() exp\n");
-                       goto out_unexpect_both;
-               }
-
-               invert_tuplepr(&inv_tuple, &exp_reply->tuple);
-               if (ip_ct_gre_keymap_add(master, &inv_tuple, 1) != 0) {
-                       ip_ct_gre_keymap_destroy(master);
-                       DEBUGP("cannot keymap_add() exp_inv\n");
-                       goto out_unexpect_both;
-               }
-               ret = 0;
+       if (ip_nat_pptp_hook_exp_gre)
+               ip_nat_pptp_hook_exp_gre(exp_orig, exp_reply);
+       if (ip_conntrack_expect_related(exp_orig) != 0)
+               goto out_put_both;
+       if (ip_conntrack_expect_related(exp_reply) != 0)
+               goto out_unexpect_orig;
+
+       /* Add GRE keymap entries */
+       if (ip_ct_gre_keymap_add(ct, &exp_orig->tuple, 0) != 0)
+               goto out_unexpect_both;
+       if (ip_ct_gre_keymap_add(ct, &exp_reply->tuple, 1) != 0) {
+               ip_ct_gre_keymap_destroy(ct);
+               goto out_unexpect_both;
        }
+       ret = 0;
 
 out_put_both:
        ip_conntrack_expect_put(exp_reply);
index 0f5e753..84f6bd0 100644 (file)
@@ -211,80 +211,28 @@ pptp_outbound_pkt(struct sk_buff **pskb,
        return NF_ACCEPT;
 }
 
-static int
+static void
 pptp_exp_gre(struct ip_conntrack_expect *expect_orig,
             struct ip_conntrack_expect *expect_reply)
 {
-       struct ip_ct_pptp_master *ct_pptp_info =
-                               &expect_orig->master->help.ct_pptp_info;
-       struct ip_nat_pptp *nat_pptp_info =
-                               &expect_orig->master->nat.help.nat_pptp_info;
-
        struct ip_conntrack *ct = expect_orig->master;
-
-       struct ip_conntrack_tuple inv_t;
-       struct ip_conntrack_tuple *orig_t, *reply_t;
+       struct ip_ct_pptp_master *ct_pptp_info = &ct->help.ct_pptp_info;
+       struct ip_nat_pptp *nat_pptp_info = &ct->nat.help.nat_pptp_info;
 
        /* save original PAC call ID in nat_info */
        nat_pptp_info->pac_call_id = ct_pptp_info->pac_call_id;
 
-       /* alter expectation */
-       orig_t = &ct->tuplehash[IP_CT_DIR_ORIGINAL].tuple;
-       reply_t = &ct->tuplehash[IP_CT_DIR_REPLY].tuple;
-
        /* alter expectation for PNS->PAC direction */
-       invert_tuplepr(&inv_t, &expect_orig->tuple);
        expect_orig->saved_proto.gre.key = ct_pptp_info->pns_call_id;
        expect_orig->tuple.src.u.gre.key = nat_pptp_info->pns_call_id;
        expect_orig->tuple.dst.u.gre.key = ct_pptp_info->pac_call_id;
        expect_orig->dir = IP_CT_DIR_ORIGINAL;
-       inv_t.src.ip = reply_t->src.ip;
-       inv_t.dst.ip = reply_t->dst.ip;
-       inv_t.src.u.gre.key = nat_pptp_info->pac_call_id;
-       inv_t.dst.u.gre.key = ct_pptp_info->pns_call_id;
-
-       if (!ip_conntrack_expect_related(expect_orig)) {
-               DEBUGP("successfully registered expect\n");
-       } else {
-               DEBUGP("can't expect_related(expect_orig)\n");
-               return 1;
-       }
 
        /* alter expectation for PAC->PNS direction */
-       invert_tuplepr(&inv_t, &expect_reply->tuple);
        expect_reply->saved_proto.gre.key = nat_pptp_info->pns_call_id;
        expect_reply->tuple.src.u.gre.key = nat_pptp_info->pac_call_id;
        expect_reply->tuple.dst.u.gre.key = ct_pptp_info->pns_call_id;
        expect_reply->dir = IP_CT_DIR_REPLY;
-       inv_t.src.ip = orig_t->src.ip;
-       inv_t.dst.ip = orig_t->dst.ip;
-       inv_t.src.u.gre.key = nat_pptp_info->pns_call_id;
-       inv_t.dst.u.gre.key = ct_pptp_info->pac_call_id;
-
-       if (!ip_conntrack_expect_related(expect_reply)) {
-               DEBUGP("successfully registered expect\n");
-       } else {
-               DEBUGP("can't expect_related(expect_reply)\n");
-               ip_conntrack_unexpect_related(expect_orig);
-               return 1;
-       }
-
-       if (ip_ct_gre_keymap_add(ct, &expect_reply->tuple, 0) < 0) {
-               DEBUGP("can't register original keymap\n");
-               ip_conntrack_unexpect_related(expect_orig);
-               ip_conntrack_unexpect_related(expect_reply);
-               return 1;
-       }
-
-       if (ip_ct_gre_keymap_add(ct, &inv_t, 1) < 0) {
-               DEBUGP("can't register reply keymap\n");
-               ip_conntrack_unexpect_related(expect_orig);
-               ip_conntrack_unexpect_related(expect_reply);
-               ip_ct_gre_keymap_destroy(ct);
-               return 1;
-       }
-
-       return 0;
 }
 
 /* inbound packets == from PAC to PNS */