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From 654b2e2512630df07e3ea57f8d54e851e75b33f1 Mon Sep 17 00:00:00 2001
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e8e25e |
From: Phil Sutter <phil@nwl.cc>
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Date: Thu, 13 Feb 2020 17:49:53 +0100
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e8e25e |
Subject: [PATCH] ebtables: among: Support mixed MAC and MAC/IP entries
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e8e25e |
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e8e25e |
Powered by Stefano's support for concatenated ranges, a full among match
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e8e25e |
replacement can be implemented. The trick is to add MAC-only elements as
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e8e25e |
a concatenation of MAC and zero-length prefix, i.e. a range from
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e8e25e |
0.0.0.0 till 255.255.255.255.
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e8e25e |
Although not quite needed, detection of pure MAC-only matches is left in
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place. For those, no implicit 'meta protocol' match is added (which is
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required otherwise at least to keep nft output correct) and no concat
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type is used for the set.
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e8e25e |
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e8e25e |
Signed-off-by: Phil Sutter <phil@nwl.cc>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
(cherry picked from commit c33bae9c6c7a49c8af16df846e6112fc4727e643)
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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e8e25e |
---
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extensions/libebt_among.c | 6 +-----
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extensions/libebt_among.t | 2 +-
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iptables/ebtables-nft.8 | 4 ----
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iptables/nft.c | 20 +++++++++++++++++++-
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4 files changed, 21 insertions(+), 11 deletions(-)
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diff --git a/extensions/libebt_among.c b/extensions/libebt_among.c
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e8e25e |
index 715d559f432c2..2b9a1b6566684 100644
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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--- a/extensions/libebt_among.c
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+++ b/extensions/libebt_among.c
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e8e25e |
@@ -63,10 +63,6 @@ parse_nft_among_pair(char *buf, struct nft_among_pair *pair, bool have_ip)
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char *sep = index(buf, '=');
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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struct ether_addr *ether;
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- if (have_ip ^ !!sep)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
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- xtables_error(PARAMETER_PROBLEM,
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- "among: Mixed MAC and MAC=IP not allowed.");
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e8e25e |
-
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if (sep) {
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e8e25e |
*sep = '\0';
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@@ -205,7 +201,7 @@ static void __bramong_print(struct nft_among_pair *pairs,
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isep = ",";
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printf("%s", ether_ntoa(&pairs[i].ether));
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- if (have_ip)
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+ if (pairs[i].in.s_addr != INADDR_ANY)
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printf("=%s", inet_ntoa(pairs[i].in));
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}
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printf(" ");
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diff --git a/extensions/libebt_among.t b/extensions/libebt_among.t
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index 56b299161ff31..a02206f391cde 100644
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--- a/extensions/libebt_among.t
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+++ b/extensions/libebt_among.t
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@@ -13,4 +13,4 @@
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--among-src;=;FAIL
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--among-src 00:11=10.0.0.1;=;FAIL
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--among-src de:ad:0:be:ee:ff=10.256.0.1;=;FAIL
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---among-src de:ad:0:be:ee:ff,c0:ff:ee:0:ba:be=192.168.1.1;=;FAIL
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+--among-src c0:ff:ee:0:ba:be=192.168.1.1,de:ad:0:be:ee:ff;=;OK
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diff --git a/iptables/ebtables-nft.8 b/iptables/ebtables-nft.8
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index a91f0c1aacb0f..1fa5ad9388cc0 100644
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--- a/iptables/ebtables-nft.8
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+++ b/iptables/ebtables-nft.8
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@@ -551,10 +551,6 @@ Same as
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.BR "--among-src-file " "[!] \fIfile\fP"
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Same as
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.BR --among-src " but the list is read in from the specified file."
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-.PP
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-Note that in this implementation of ebtables, among lists uses must be
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-internally homogeneous regarding whether IP addresses are present or not. Mixed
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-use of MAC addresses and MAC/IP address pairs is not supported yet.
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.SS arp
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Specify (R)ARP fields. The protocol must be specified as
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.IR ARP " or " RARP .
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diff --git a/iptables/nft.c b/iptables/nft.c
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index 0287add3fb21f..4930b6de534d8 100644
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--- a/iptables/nft.c
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+++ b/iptables/nft.c
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@@ -1029,19 +1029,28 @@ static int __add_nft_among(struct nft_handle *h, const char *table,
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};
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struct nftnl_expr *e;
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struct nftnl_set *s;
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+ uint32_t flags = 0;
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int idx = 0;
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if (ip) {
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type = type << CONCAT_TYPE_BITS | NFT_DATATYPE_IPADDR;
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len += sizeof(struct in_addr) + NETLINK_ALIGN - 1;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
len &= ~(NETLINK_ALIGN - 1);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ flags = NFT_SET_INTERVAL;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
}
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
- s = add_anon_set(h, table, 0, type, len, cnt);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ s = add_anon_set(h, table, flags, type, len, cnt);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
if (!s)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
return -ENOMEM;
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|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
set_id = nftnl_set_get_u32(s, NFTNL_SET_ID);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ if (ip) {
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|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ uint8_t field_len[2] = { ETH_ALEN, sizeof(struct in_addr) };
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ nftnl_set_set_data(s, NFTNL_SET_DESC_CONCAT,
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|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ field_len, sizeof(field_len));
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+
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|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
for (idx = 0; idx < cnt; idx++) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
struct nftnl_set_elem *elem = nftnl_set_elem_alloc();
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
|
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
@@ -1049,6 +1058,15 @@ static int __add_nft_among(struct nft_handle *h, const char *table,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
return -ENOMEM;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
nftnl_set_elem_set(elem, NFTNL_SET_ELEM_KEY,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
&pairs[idx], len);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ if (ip) {
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ struct in_addr tmp = pairs[idx].in;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ if (tmp.s_addr == INADDR_ANY)
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ pairs[idx].in.s_addr = INADDR_BROADCAST;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ nftnl_set_elem_set(elem, NFTNL_SET_ELEM_KEY_END,
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ &pairs[idx], len);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ pairs[idx].in = tmp;
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
+ }
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
nftnl_set_elem_add(s, elem);
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
}
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
--
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
2.26.2
|
|
![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
e8e25e |
|