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160 lines
7.4 KiB
160 lines
7.4 KiB
2 years ago
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From 48f38c4224f31d19176df83539501292fcc6092b Mon Sep 17 00:00:00 2001
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From: Phil Sutter <phil@nwl.cc>
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Date: Tue, 4 May 2021 16:26:42 +0200
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Subject: [PATCH] extensions: sctp: Translate --chunk-types option
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The translation is not fully complete as it is not possible to map 'any'
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match type into nft syntax with a single rule. Also, 'only' match type
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translation is a bit poor as it explicitly lists all chunk types that
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are supposed to be missing.
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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(cherry picked from commit 5818be177110a09120dd8fe4bd2533acbf8da301)
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---
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extensions/libxt_sctp.c | 91 ++++++++++++++++++++++++++++--------
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extensions/libxt_sctp.txlate | 6 +++
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2 files changed, 78 insertions(+), 19 deletions(-)
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diff --git a/extensions/libxt_sctp.c b/extensions/libxt_sctp.c
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index ee4e99ebf11bf..5d8ab85cacf42 100644
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--- a/extensions/libxt_sctp.c
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+++ b/extensions/libxt_sctp.c
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@@ -92,28 +92,29 @@ struct sctp_chunk_names {
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const char *name;
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unsigned int chunk_type;
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const char *valid_flags;
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+ const char *nftname;
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};
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/*'ALL' and 'NONE' will be treated specially. */
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static const struct sctp_chunk_names sctp_chunk_names[]
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-= { { .name = "DATA", .chunk_type = 0, .valid_flags = "----IUBE"},
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- { .name = "INIT", .chunk_type = 1, .valid_flags = "--------"},
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- { .name = "INIT_ACK", .chunk_type = 2, .valid_flags = "--------"},
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- { .name = "SACK", .chunk_type = 3, .valid_flags = "--------"},
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- { .name = "HEARTBEAT", .chunk_type = 4, .valid_flags = "--------"},
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- { .name = "HEARTBEAT_ACK", .chunk_type = 5, .valid_flags = "--------"},
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- { .name = "ABORT", .chunk_type = 6, .valid_flags = "-------T"},
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- { .name = "SHUTDOWN", .chunk_type = 7, .valid_flags = "--------"},
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- { .name = "SHUTDOWN_ACK", .chunk_type = 8, .valid_flags = "--------"},
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- { .name = "ERROR", .chunk_type = 9, .valid_flags = "--------"},
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- { .name = "COOKIE_ECHO", .chunk_type = 10, .valid_flags = "--------"},
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- { .name = "COOKIE_ACK", .chunk_type = 11, .valid_flags = "--------"},
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- { .name = "ECN_ECNE", .chunk_type = 12, .valid_flags = "--------"},
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- { .name = "ECN_CWR", .chunk_type = 13, .valid_flags = "--------"},
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- { .name = "SHUTDOWN_COMPLETE", .chunk_type = 14, .valid_flags = "-------T"},
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- { .name = "ASCONF", .chunk_type = 193, .valid_flags = "--------"},
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- { .name = "ASCONF_ACK", .chunk_type = 128, .valid_flags = "--------"},
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- { .name = "FORWARD_TSN", .chunk_type = 192, .valid_flags = "--------"},
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+= { { .name = "DATA", .chunk_type = 0, .valid_flags = "----IUBE", .nftname = "data" },
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+ { .name = "INIT", .chunk_type = 1, .valid_flags = "--------", .nftname = "init" },
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+ { .name = "INIT_ACK", .chunk_type = 2, .valid_flags = "--------", .nftname = "init-ack" },
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+ { .name = "SACK", .chunk_type = 3, .valid_flags = "--------", .nftname = "sack" },
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+ { .name = "HEARTBEAT", .chunk_type = 4, .valid_flags = "--------", .nftname = "heartbeat" },
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+ { .name = "HEARTBEAT_ACK", .chunk_type = 5, .valid_flags = "--------", .nftname = "heartbeat-ack" },
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+ { .name = "ABORT", .chunk_type = 6, .valid_flags = "-------T", .nftname = "abort" },
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+ { .name = "SHUTDOWN", .chunk_type = 7, .valid_flags = "--------", .nftname = "shutdown" },
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+ { .name = "SHUTDOWN_ACK", .chunk_type = 8, .valid_flags = "--------", .nftname = "shutdown-ack" },
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+ { .name = "ERROR", .chunk_type = 9, .valid_flags = "--------", .nftname = "error" },
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+ { .name = "COOKIE_ECHO", .chunk_type = 10, .valid_flags = "--------", .nftname = "cookie-echo" },
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+ { .name = "COOKIE_ACK", .chunk_type = 11, .valid_flags = "--------", .nftname = "cookie-ack" },
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+ { .name = "ECN_ECNE", .chunk_type = 12, .valid_flags = "--------", .nftname = "ecne" },
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+ { .name = "ECN_CWR", .chunk_type = 13, .valid_flags = "--------", .nftname = "cwr" },
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+ { .name = "SHUTDOWN_COMPLETE", .chunk_type = 14, .valid_flags = "-------T", .nftname = "shutdown-complete" },
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+ { .name = "ASCONF", .chunk_type = 193, .valid_flags = "--------", .nftname = "asconf" },
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+ { .name = "ASCONF_ACK", .chunk_type = 128, .valid_flags = "--------", .nftname = "asconf-ack" },
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+ { .name = "FORWARD_TSN", .chunk_type = 192, .valid_flags = "--------", .nftname = "forward-tsn" },
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};
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static void
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@@ -485,12 +486,52 @@ static void sctp_save(const void *ip, const struct xt_entry_match *match)
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}
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}
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+static const char *sctp_xlate_chunk(struct xt_xlate *xl, const char *space,
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+ const struct xt_sctp_info *einfo,
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+ const struct sctp_chunk_names *scn)
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+{
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+ bool inv = einfo->invflags & XT_SCTP_CHUNK_TYPES;
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+ const struct xt_sctp_flag_info *flag_info = NULL;
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+ int i;
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+
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+ if (!scn->nftname)
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+ return space;
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+
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+ if (!SCTP_CHUNKMAP_IS_SET(einfo->chunkmap, scn->chunk_type)) {
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+ if (einfo->chunk_match_type != SCTP_CHUNK_MATCH_ONLY)
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+ return space;
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+
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+ xt_xlate_add(xl, "%ssctp chunk %s %s", space,
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+ scn->nftname, inv ? "exists" : "missing");
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+ return " ";
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+ }
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+
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+ for (i = 0; i < einfo->flag_count; i++) {
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+ if (einfo->flag_info[i].chunktype == scn->chunk_type) {
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+ flag_info = &einfo->flag_info[i];
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+ break;
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+ }
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+ }
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+
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+ if (!flag_info) {
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+ xt_xlate_add(xl, "%ssctp chunk %s %s", space,
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+ scn->nftname, inv ? "missing" : "exists");
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+ return " ";
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+ }
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+
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+ xt_xlate_add(xl, "%ssctp chunk %s flags & 0x%x %s 0x%x", space,
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+ scn->nftname, flag_info->flag_mask,
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+ inv ? "!=" : "==", flag_info->flag);
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+
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+ return " ";
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+}
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+
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static int sctp_xlate(struct xt_xlate *xl,
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const struct xt_xlate_mt_params *params)
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{
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const struct xt_sctp_info *einfo =
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(const struct xt_sctp_info *)params->match->data;
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- char *space = "";
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+ const char *space = "";
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if (!einfo->flags)
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return 0;
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@@ -516,6 +557,18 @@ static int sctp_xlate(struct xt_xlate *xl,
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xt_xlate_add(xl, "%ssctp dport%s %u", space,
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einfo->invflags & XT_SCTP_DEST_PORTS ? " !=" : "",
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einfo->dpts[0]);
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+ space = " ";
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+ }
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+
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+ if (einfo->flags & XT_SCTP_CHUNK_TYPES) {
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+ int i;
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+
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+ if (einfo->chunk_match_type == SCTP_CHUNK_MATCH_ANY)
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+ return 0;
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+
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+ for (i = 0; i < ARRAY_SIZE(sctp_chunk_names); i++)
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+ space = sctp_xlate_chunk(xl, space, einfo,
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+ &sctp_chunk_names[i]);
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}
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return 1;
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diff --git a/extensions/libxt_sctp.txlate b/extensions/libxt_sctp.txlate
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index 0d6c59e183675..bb817525db8d8 100644
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--- a/extensions/libxt_sctp.txlate
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+++ b/extensions/libxt_sctp.txlate
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@@ -36,3 +36,9 @@ nft add rule ip filter INPUT sctp sport 50 sctp dport != 80-100 counter accept
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iptables-translate -A INPUT -p sctp --dport 80 ! --sport 50:55 -j ACCEPT
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nft add rule ip filter INPUT sctp sport != 50-55 sctp dport 80 counter accept
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+
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+iptables-translate -A INPUT -p sctp --chunk-types all INIT,DATA:iUbE,SACK,ABORT:T -j ACCEPT
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+nft add rule ip filter INPUT sctp chunk data flags & 0xf == 0x5 sctp chunk init exists sctp chunk sack exists sctp chunk abort flags & 0x1 == 0x1 counter accept
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+
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+iptables-translate -A INPUT -p sctp --chunk-types only SHUTDOWN_COMPLETE -j ACCEPT
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+nft add rule ip filter INPUT sctp chunk data missing sctp chunk init missing sctp chunk init-ack missing sctp chunk sack missing sctp chunk heartbeat missing sctp chunk heartbeat-ack missing sctp chunk abort missing sctp chunk shutdown missing sctp chunk shutdown-ack missing sctp chunk error missing sctp chunk cookie-echo missing sctp chunk cookie-ack missing sctp chunk ecne missing sctp chunk cwr missing sctp chunk shutdown-complete exists sctp chunk asconf missing sctp chunk asconf-ack missing sctp chunk forward-tsn missing counter accept
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--
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2.31.1
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