diff options
author | Máté Eckl <ecklm94@gmail.com> | 2018-07-20 09:40:09 +0200 |
---|---|---|
committer | Pablo Neira Ayuso <pablo@netfilter.org> | 2018-08-03 12:17:31 +0200 |
commit | 2be1d52644cf77bb2634fb504a265da480c5e901 (patch) | |
tree | 3ab676648f1b5c51583113ecca27b450e10bb210 /src/statement.c | |
parent | 42ea301c7f3d1d55802fa2d675cdc653a72bd8c5 (diff) |
src: Add tproxy support
This patch adds support for transparent proxy functionality which is
supported in ip, ip6 and inet tables.
The syntax is the following:
tproxy [{|ip|ip6}] to {<ip address>|:<port>|<ip address>:<port>}
It looks for a socket listening on the specified address or port and
assigns it to the matching packet.
In an inet table, a packet matches for both families until address is
specified.
Network protocol family has to be specified **only** in inet tables if
address is specified.
As transparent proxy support is implemented for sockets with layer 4
information, a transport protocol header criterion has to be set in the
same rule. eg. 'meta l4proto tcp' or 'udp dport 4444'
Example ruleset:
table ip x {
chain y {
type filter hook prerouting priority -150; policy accept;
tcp dport ntp tproxy to 1.1.1.1
udp dport ssh tproxy to :2222
}
}
table ip6 x {
chain y {
type filter hook prerouting priority -150; policy accept;
tcp dport ntp tproxy to [dead::beef]
udp dport ssh tproxy to :2222
}
}
table inet x {
chain y {
type filter hook prerouting priority -150; policy accept;
tcp dport 321 tproxy to :ssh
tcp dport 99 tproxy ip to 1.1.1.1:999
udp dport 155 tproxy ip6 to [dead::beef]:smux
}
}
Signed-off-by: Máté Eckl <ecklm94@gmail.com>
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Diffstat (limited to 'src/statement.c')
-rw-r--r-- | src/statement.c | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/src/statement.c b/src/statement.c index 6f5e6660..3040476f 100644 --- a/src/statement.c +++ b/src/statement.c @@ -760,6 +760,51 @@ struct stmt *fwd_stmt_alloc(const struct location *loc) return stmt_alloc(loc, &fwd_stmt_ops); } +static void tproxy_stmt_print(const struct stmt *stmt, struct output_ctx *octx) +{ + nft_print(octx, "tproxy"); + + if (stmt->tproxy.table_family == NFPROTO_INET && + stmt->tproxy.family != NFPROTO_UNSPEC) + nft_print(octx, " %s", nfproto_family_name(stmt->tproxy.family)); + nft_print(octx, " to"); + if (stmt->tproxy.addr) { + nft_print(octx, " "); + if (stmt->tproxy.addr->ops->type == EXPR_VALUE && + stmt->tproxy.addr->dtype->type == TYPE_IP6ADDR) { + nft_print(octx, "["); + expr_print(stmt->tproxy.addr, octx); + nft_print(octx, "]"); + } else { + expr_print(stmt->tproxy.addr, octx); + } + } + if (stmt->tproxy.port && stmt->tproxy.port->ops->type == EXPR_VALUE) { + if (!stmt->tproxy.addr) + nft_print(octx, " "); + nft_print(octx, ":"); + expr_print(stmt->tproxy.port, octx); + } +} + +static void tproxy_stmt_destroy(struct stmt *stmt) +{ + expr_free(stmt->tproxy.addr); + expr_free(stmt->tproxy.port); +} + +static const struct stmt_ops tproxy_stmt_ops = { + .type = STMT_TPROXY, + .name = "tproxy", + .print = tproxy_stmt_print, + .destroy = tproxy_stmt_destroy, +}; + +struct stmt *tproxy_stmt_alloc(const struct location *loc) +{ + return stmt_alloc(loc, &tproxy_stmt_ops); +} + static void xt_stmt_print(const struct stmt *stmt, struct output_ctx *octx) { xt_stmt_xlate(stmt); |