[OpenWrt-Devel] [PATCH] Add support to define multiple zones for dnat redirection reflection rules
Anton Engelhardt
engelhardt.anton at gmail.com
Fri Sep 14 13:31:15 EDT 2018
Added new config option for redirect, which accespts a list of zones, from which reflection rules shall be created.
Example:
zones: wan lan devices servers
config redirect
...
option target 'DNAT'
option src 'wan'
option dest 'servers'
option proto 'tcp'
option src_dport '443'
option dest_port '443'
option name 'HTTPS'
option reflection_src 'extern'
...
Old behaviour would only add a reflection rule from the servers zone.
By adding a config option
option reflection_zones 'lan devices servers'
reflection rules will get added for all and only the given zones.
Reflection is therefore also possible like this
option reflection_zones 'lan devices'
Which enables to create a redirection to zone servers, without a reflection rule for that zone.
Not setting that option results in the old behaviour.
Tested on x86 master and 18.06.
Signed-off-by: Anton Engelhardt <engelhardt.anton at gmail.com>
---
options.h | 2 ++
redirects.c | 58 ++++++++++++++++++++++++++++++++++++++++------------------
2 files changed, 42 insertions(+), 18 deletions(-)
diff --git a/options.h b/options.h
index a75cfa3..2804f98 100644
--- a/options.h
+++ b/options.h
@@ -441,6 +441,8 @@ struct fw3_redirect
bool local;
bool reflection;
enum fw3_reflection_source reflection_src;
+ struct list_head reflection_zones;
+ struct list_head *_reflection_zones;
};
struct fw3_snat
diff --git a/redirects.c b/redirects.c
index 6cd09f1..2f899a3 100644
--- a/redirects.c
+++ b/redirects.c
@@ -61,6 +61,7 @@ const struct fw3_option fw3_redirect_opts[] = {
FW3_OPT("reflection", bool, redirect, reflection),
FW3_OPT("reflection_src", reflection_source,
redirect, reflection_src),
+ FW3_LIST("reflection_zones", device, redirect, reflection_zones),
FW3_OPT("target", target, redirect, target),
@@ -367,6 +368,7 @@ fw3_alloc_redirect(struct fw3_state *state)
INIT_LIST_HEAD(&redir->proto);
INIT_LIST_HEAD(&redir->mac_src);
+ INIT_LIST_HEAD(&redir->reflection_zones);
redir->enabled = true;
redir->reflection = true;
@@ -612,7 +614,7 @@ static void
print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
struct fw3_redirect *redir, int num,
struct fw3_protocol *proto, struct fw3_address *ra,
- struct fw3_address *ia, struct fw3_address *ea)
+ struct fw3_address *ia, struct fw3_address *ea, struct fw3_device *rz)
{
struct fw3_ipt_rule *r;
@@ -625,7 +627,7 @@ print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
fw3_ipt_rule_time(r, &redir->time);
set_comment(r, redir->name, num, "reflection");
set_snat_dnat(r, FW3_FLAG_DNAT, &redir->ip_redir, &redir->port_redir);
- fw3_ipt_rule_replace(r, "zone_%s_prerouting", redir->dest.name);
+ fw3_ipt_rule_replace(r, "zone_%s_prerouting", rz->name);
r = fw3_ipt_rule_create(h, proto, NULL, NULL, ia, &redir->ip_redir);
fw3_ipt_rule_sport_dport(r, NULL, &redir->port_redir);
@@ -633,7 +635,7 @@ print_reflection(struct fw3_ipt_handle *h, struct fw3_state *state,
fw3_ipt_rule_time(r, &redir->time);
set_comment(r, redir->name, num, "reflection");
set_snat_dnat(r, FW3_FLAG_SNAT, ra, NULL);
- fw3_ipt_rule_replace(r, "zone_%s_postrouting", redir->dest.name);
+ fw3_ipt_rule_replace(r, "zone_%s_postrouting", rz->name);
break;
default:
@@ -649,6 +651,7 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
struct fw3_address *ext_addr, *int_addr, ref_addr;
struct fw3_protocol *proto;
struct fw3_mac *mac;
+ struct fw3_device *reflection_zone;
if (redir->name)
info(" * Redirect '%s'", redir->name);
@@ -698,6 +701,18 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
print_redirect(handle, state, redir, num, proto, mac);
/* reflection rules */
+ // use reflection_zones if set, else the redirection dest zone for reflection
+ struct fw3_device *dest;
+ if(list_empty(&redir->reflection_zones)) {
+ redir->_reflection_zones = calloc(1, sizeof(struct list_head));
+ INIT_LIST_HEAD(redir->_reflection_zones);
+ dest = calloc(1, sizeof(struct fw3_device));
+ memcpy((void *)dest, (void *)&redir->dest, sizeof(struct fw3_device));
+ list_add(&(dest->list), redir->_reflection_zones);
+ } else {
+ redir->_reflection_zones = &redir->reflection_zones;
+ }
+
if (redir->target != FW3_FLAG_DNAT || !redir->reflection || redir->local)
return;
@@ -705,9 +720,8 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
return;
ext_addrs = fw3_resolve_zone_addresses(redir->_src, &redir->ip_dest);
- int_addrs = fw3_resolve_zone_addresses(redir->_dest, NULL);
- if (!ext_addrs || !int_addrs)
+ if (!ext_addrs)
goto out;
list_for_each_entry(ext_addr, ext_addrs, list)
@@ -715,26 +729,34 @@ expand_redirect(struct fw3_ipt_handle *handle, struct fw3_state *state,
if (!fw3_is_family(ext_addr, handle->family))
continue;
- list_for_each_entry(int_addr, int_addrs, list)
+ list_for_each_entry(reflection_zone, redir->_reflection_zones, list)
{
- if (!fw3_is_family(int_addr, handle->family))
+ struct fw3_zone *zone = fw3_lookup_zone(state, reflection_zone->name);
+ if (!zone)
continue;
-
- fw3_foreach(proto, &redir->proto)
+
+ int_addrs = fw3_resolve_zone_addresses(zone, NULL);
+ list_for_each_entry(int_addr, int_addrs, list)
{
- if (!proto)
+ if (!fw3_is_family(int_addr, handle->family))
continue;
- if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
- ref_addr = *int_addr;
- else
- ref_addr = *ext_addr;
+ fw3_foreach(proto, &redir->proto)
+ {
+ if (!proto)
+ continue;
+
+ if (redir->reflection_src == FW3_REFLECTION_INTERNAL)
+ ref_addr = *int_addr;
+ else
+ ref_addr = *ext_addr;
- ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
- ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
+ ref_addr.mask.v4.s_addr = 0xFFFFFFFF;
+ ext_addr->mask.v4.s_addr = 0xFFFFFFFF;
- print_reflection(handle, state, redir, num, proto,
- &ref_addr, int_addr, ext_addr);
+ print_reflection(handle, state, redir, num, proto,
+ &ref_addr, int_addr, ext_addr, reflection_zone);
+ }
}
}
}
--
2.7.4
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