diff options
author | Laura Garcia Liebana <nevola@gmail.com> | 2016-03-16 23:00:22 +0100 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2016-03-17 16:45:10 +0100 |
commit | aa158ca0fda65ae6e62ca76d0744def3a03160bb (patch) | |
tree | 66912d8eafea85f8a7383e84ae00a521d214b57e /extensions/libipt_icmp.c | |
parent | e778811998dec5788d65027a88c37a5f0ac46524 (diff) |
extensions: libipt_icmp: Add translation to nft
Add translation for icmp to nftables. Not supported icmp codes in nftables
are: network-unreachable, host-unreachable, protocol-unreachable,
port-unreachable, fragmentation-needed, source-route-failed,
network-unknown, host-unknown, network-prohibited, host-prohibited,
TOS-network-unreachable, TOS-host-unreachable, communication-prohibited,
host-precedence-violation, precedence-cutoff, network-redirect,
host-redirect, TOS-network-redirect, TOS-host-redirect,
ttl-zero-during-transit, ttl-zero-during-reassembly, ip-header-bad and required-option-missing.
Examples:
$ sudo iptables-translate -t filter -A INPUT -m icmp --icmp-type echo-reply -j ACCEPT
nft add rule ip filter INPUT icmp type echo-reply counter accept
$ sudo iptables-translate -t filter -A INPUT -m icmp --icmp-type 3 -j ACCEPT
nft add rule ip filter INPUT icmp type destination-unreachable counter accept
$ sudo iptables-translate -t filter -A INPUT -m icmp ! --icmp-type 3 -j ACCEPT
nft add rule ip filter INPUT icmp type != destination-unreachable counter accept
Signed-off-by: Laura Garcia Liebana <nevola@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'extensions/libipt_icmp.c')
-rw-r--r-- | extensions/libipt_icmp.c | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/extensions/libipt_icmp.c b/extensions/libipt_icmp.c index 666e7daf..fb6050a8 100644 --- a/extensions/libipt_icmp.c +++ b/extensions/libipt_icmp.c @@ -249,6 +249,43 @@ static void icmp_save(const void *ip, const struct xt_entry_match *match) } } +static unsigned int type_xlate_print(struct xt_xlate *xl, unsigned int icmptype, + unsigned int code_min, + unsigned int code_max) +{ + unsigned int i; + + if (code_min != code_max) { + for (i = 0; i < ARRAY_SIZE(icmp_codes); ++i) + if (icmp_codes[i].type == icmptype && + icmp_codes[i].code_min == code_min && + icmp_codes[i].code_max == code_max) { + xt_xlate_add(xl, icmp_codes[i].name); + return 1; + } + } + + return 0; +} + +static int icmp_xlate(const void *ip, const struct xt_entry_match *match, + struct xt_xlate *xl, int numeric) +{ + const struct ipt_icmp *info = (struct ipt_icmp *)match->data; + + if (info->type != 0xFF) { + xt_xlate_add(xl, "icmp type%s ", + (info->invflags & IPT_ICMP_INV) ? " !=" : ""); + + if (!type_xlate_print(xl, info->type, info->code[0], + info->code[1])) + return 0; + + xt_xlate_add(xl, " "); + } + return 1; +} + static struct xtables_match icmp_mt_reg = { .name = "icmp", .version = XTABLES_VERSION, @@ -261,6 +298,7 @@ static struct xtables_match icmp_mt_reg = { .save = icmp_save, .x6_parse = icmp_parse, .x6_options = icmp_opts, + .xlate = icmp_xlate, }; void _init(void) |