From 4283428e492835cc1b4f5212ac7f0f6958c60584 Mon Sep 17 00:00:00 2001 From: Florian Tham Date: Mon, 18 Feb 2019 09:55:46 +0100 Subject: netfilter: nf_conntrack_amanda: add support for STATE streams The Amanda CONNECT command has been updated to establish an optional fourth connection [0]. Previously, a CONNECT command would look like: CONNECT DATA port0 MESG port1 INDEX port2 nf_conntrack_amanda analyses the CONNECT command string in order to learn the port numbers of the related DATA, MESG and INDEX streams. As of amanda v3.4, the CONNECT command can advertise an additional port: CONNECT DATA port0 MESG port1 INDEX port2 STATE port3 The new STATE stream is not handled, thus the connection on the STATE port cannot be established. The patch adds support for STATE streams to the amanda conntrack helper. I tested with max_expected = 3, leaving the other patch hunks unmodified. Amanda reports "connection refused" and aborts. After I set max_expected to 4, the backup completes successfully. [0] https://github.com/zmanda/amanda/commit/3b8384fc9f2941e2427f44c3aee29f561ed67894#diff-711e502fc81a65182c0954765b42919eR456 Signed-off-by: Florian Tham Signed-off-by: Pablo Neira Ayuso --- net/netfilter/nf_conntrack_amanda.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) (limited to 'net/netfilter') diff --git a/net/netfilter/nf_conntrack_amanda.c b/net/netfilter/nf_conntrack_amanda.c index 20edd589fe06..f2681ec5b5f6 100644 --- a/net/netfilter/nf_conntrack_amanda.c +++ b/net/netfilter/nf_conntrack_amanda.c @@ -54,6 +54,7 @@ enum amanda_strings { SEARCH_DATA, SEARCH_MESG, SEARCH_INDEX, + SEARCH_STATE, }; static struct { @@ -81,6 +82,10 @@ static struct { .string = "INDEX ", .len = 6, }, + [SEARCH_STATE] = { + .string = "STATE ", + .len = 6, + }, }; static int amanda_help(struct sk_buff *skb, @@ -124,7 +129,7 @@ static int amanda_help(struct sk_buff *skb, goto out; stop += start; - for (i = SEARCH_DATA; i <= SEARCH_INDEX; i++) { + for (i = SEARCH_DATA; i <= SEARCH_STATE; i++) { off = skb_find_text(skb, start, stop, search[i].ts); if (off == UINT_MAX) continue; @@ -168,7 +173,7 @@ out: } static const struct nf_conntrack_expect_policy amanda_exp_policy = { - .max_expected = 3, + .max_expected = 4, .timeout = 180, }; -- cgit v1.2.3-59-g8ed1b