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aca4c4 |
From daca1bc21c6fca067d861792c97357d7561a0564 Mon Sep 17 00:00:00 2001
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aca4c4 |
From: Phil Sutter <phil@nwl.cc>
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aca4c4 |
Date: Tue, 1 Mar 2022 23:05:29 +0100
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aca4c4 |
Subject: [PATCH] xshared: Prefer xtables_chain_protos lookup over getprotoent
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aca4c4 |
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aca4c4 |
When dumping a large ruleset, common protocol matches such as for TCP
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aca4c4 |
port number significantly slow down rule printing due to repeated calls
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aca4c4 |
for getprotobynumber(). The latter does not involve any caching, so
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aca4c4 |
/etc/protocols is consulted over and over again.
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aca4c4 |
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aca4c4 |
As a simple countermeasure, make functions converting between proto
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aca4c4 |
number and name prefer the built-in list of "well-known" protocols. This
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aca4c4 |
is not a perfect solution, repeated rules for protocol names libxtables
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aca4c4 |
does not cache (e.g. igmp or dccp) will still be slow. Implementing
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aca4c4 |
getprotoent() result caching could solve this.
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aca4c4 |
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aca4c4 |
As a side-effect, explicit check for pseudo-protocol "all" may be
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aca4c4 |
dropped as it is contained in the built-in list and therefore immutable.
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aca4c4 |
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aca4c4 |
Also update xtables_chain_protos entries a bit to align with typical
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aca4c4 |
/etc/protocols contents. The testsuite assumes those names, so the
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aca4c4 |
preferred ones prior to this patch are indeed uncommon nowadays.
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aca4c4 |
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aca4c4 |
Signed-off-by: Phil Sutter <phil@nwl.cc>
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aca4c4 |
Acked-by: Florian Westphal <fw@strlen.de>
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
(cherry picked from commit b6196c7504d4d41827cea86c167926125cdbf1f3)
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aca4c4 |
---
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aca4c4 |
iptables/xshared.c | 8 ++++----
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aca4c4 |
libxtables/xtables.c | 19 ++++++-------------
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aca4c4 |
2 files changed, 10 insertions(+), 17 deletions(-)
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aca4c4 |
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aca4c4 |
diff --git a/iptables/xshared.c b/iptables/xshared.c
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aca4c4 |
index e3c8072b5ca96..dcc995a9cabe6 100644
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aca4c4 |
--- a/iptables/xshared.c
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aca4c4 |
+++ b/iptables/xshared.c
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aca4c4 |
@@ -52,16 +52,16 @@ proto_to_name(uint8_t proto, int nolookup)
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aca4c4 |
{
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aca4c4 |
unsigned int i;
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aca4c4 |
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aca4c4 |
+ for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
+ if (xtables_chain_protos[i].num == proto)
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aca4c4 |
+ return xtables_chain_protos[i].name;
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aca4c4 |
+
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aca4c4 |
if (proto && !nolookup) {
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aca4c4 |
struct protoent *pent = getprotobynumber(proto);
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aca4c4 |
if (pent)
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aca4c4 |
return pent->p_name;
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aca4c4 |
}
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aca4c4 |
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aca4c4 |
- for (i = 0; xtables_chain_protos[i].name != NULL; ++i)
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aca4c4 |
- if (xtables_chain_protos[i].num == proto)
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aca4c4 |
- return xtables_chain_protos[i].name;
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aca4c4 |
-
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aca4c4 |
return NULL;
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aca4c4 |
}
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aca4c4 |
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aca4c4 |
diff --git a/libxtables/xtables.c b/libxtables/xtables.c
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aca4c4 |
index 28ffffedd8147..58dd69440253d 100644
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aca4c4 |
--- a/libxtables/xtables.c
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aca4c4 |
+++ b/libxtables/xtables.c
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aca4c4 |
@@ -2021,10 +2021,11 @@ const struct xtables_pprot xtables_chain_protos[] = {
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aca4c4 |
{"udp", IPPROTO_UDP},
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aca4c4 |
{"udplite", IPPROTO_UDPLITE},
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aca4c4 |
{"icmp", IPPROTO_ICMP},
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aca4c4 |
- {"icmpv6", IPPROTO_ICMPV6},
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aca4c4 |
{"ipv6-icmp", IPPROTO_ICMPV6},
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aca4c4 |
+ {"icmpv6", IPPROTO_ICMPV6},
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aca4c4 |
{"esp", IPPROTO_ESP},
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aca4c4 |
{"ah", IPPROTO_AH},
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aca4c4 |
+ {"mobility-header", IPPROTO_MH},
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aca4c4 |
{"ipv6-mh", IPPROTO_MH},
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aca4c4 |
{"mh", IPPROTO_MH},
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aca4c4 |
{"all", 0},
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aca4c4 |
@@ -2040,23 +2041,15 @@ xtables_parse_protocol(const char *s)
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aca4c4 |
if (xtables_strtoui(s, NULL, &proto, 0, UINT8_MAX))
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aca4c4 |
return proto;
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aca4c4 |
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aca4c4 |
- /* first deal with the special case of 'all' to prevent
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aca4c4 |
- * people from being able to redefine 'all' in nsswitch
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aca4c4 |
- * and/or provoke expensive [not working] ldap/nis/...
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aca4c4 |
- * lookups */
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aca4c4 |
- if (strcmp(s, "all") == 0)
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aca4c4 |
- return 0;
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aca4c4 |
+ for (i = 0; xtables_chain_protos[i].name != NULL; ++i) {
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aca4c4 |
+ if (strcmp(s, xtables_chain_protos[i].name) == 0)
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aca4c4 |
+ return xtables_chain_protos[i].num;
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aca4c4 |
+ }
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aca4c4 |
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aca4c4 |
pent = getprotobyname(s);
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aca4c4 |
if (pent != NULL)
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aca4c4 |
return pent->p_proto;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- for (i = 0; i < ARRAY_SIZE(xtables_chain_protos); ++i) {
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- if (xtables_chain_protos[i].name == NULL)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- continue;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- if (strcmp(s, xtables_chain_protos[i].name) == 0)
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- return xtables_chain_protos[i].num;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
- }
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
xt_params->exit_err(PARAMETER_PROBLEM,
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
"unknown protocol \"%s\" specified", s);
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
return -1;
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
--
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
2.34.1
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![](https://seccdn.libravatar.org/avatar/eca4d0658e293ac828929c05684948cb411ba891fa2ad2130aafa91b664e89ad?s=16&d=retro) |
aca4c4 |
|