From 5f823f8fd90dc77b4256fc6cc296834cbe5c0f21 Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 2 Aug 2021 11:12:29 +0200 Subject: src: add support for status dump filter This tells kernel to suppress conntrack entries that do not match the status bits/bitmask filter. This is useful to e.g. only list entries that are not assured (value 0, mask == ASSUED) or entries that only saw one-way traffic (value 0, mask == SEEN_REPLY). Signed-off-by: Florian Westphal --- include/internal/object.h | 1 + include/libnetfilter_conntrack/libnetfilter_conntrack.h | 5 +++-- src/conntrack/filter_dump.c | 17 +++++++++++++++++ 3 files changed, 21 insertions(+), 2 deletions(-) diff --git a/include/internal/object.h b/include/internal/object.h index 3f6904f..75ffdbe 100644 --- a/include/internal/object.h +++ b/include/internal/object.h @@ -287,6 +287,7 @@ struct nfct_filter { struct nfct_filter_dump { struct nfct_filter_dump_mark mark; + struct nfct_filter_dump_mark status; uint8_t l3num; uint32_t set; }; diff --git a/include/libnetfilter_conntrack/libnetfilter_conntrack.h b/include/libnetfilter_conntrack/libnetfilter_conntrack.h index f02d827..6233434 100644 --- a/include/libnetfilter_conntrack/libnetfilter_conntrack.h +++ b/include/libnetfilter_conntrack/libnetfilter_conntrack.h @@ -137,11 +137,11 @@ enum nf_conntrack_attr { ATTR_HELPER_INFO, /* variable length */ ATTR_CONNLABELS, /* variable length */ ATTR_CONNLABELS_MASK, /* variable length */ - ATTR_ORIG_ZONE, /* u16 bits */ + ATTR_ORIG_ZONE = 68, /* u16 bits */ ATTR_REPL_ZONE, /* u16 bits */ ATTR_SNAT_IPV6, /* u128 bits */ ATTR_DNAT_IPV6, /* u128 bits */ - ATTR_SYNPROXY_ISN, /* u32 bits */ + ATTR_SYNPROXY_ISN = 72, /* u32 bits */ ATTR_SYNPROXY_ITS, /* u32 bits */ ATTR_SYNPROXY_TSOFF, /* u32 bits */ ATTR_MAX @@ -546,6 +546,7 @@ struct nfct_filter_dump_mark { enum nfct_filter_dump_attr { NFCT_FILTER_DUMP_MARK = 0, /* struct nfct_filter_dump_mark */ NFCT_FILTER_DUMP_L3NUM, /* uint8_t */ + NFCT_FILTER_DUMP_STATUS, /* struct nfct_filter_dump_mark */ NFCT_FILTER_DUMP_MAX }; diff --git a/src/conntrack/filter_dump.c b/src/conntrack/filter_dump.c index 158b4cb..3894d06 100644 --- a/src/conntrack/filter_dump.c +++ b/src/conntrack/filter_dump.c @@ -19,6 +19,16 @@ set_filter_dump_attr_mark(struct nfct_filter_dump *filter_dump, filter_dump->mark.mask = this->mask; } +static void +set_filter_dump_attr_status(struct nfct_filter_dump *filter_dump, + const void *value) +{ + const struct nfct_filter_dump_mark *this = value; + + filter_dump->status.val = this->val; + filter_dump->status.mask = this->mask; +} + static void set_filter_dump_attr_family(struct nfct_filter_dump *filter_dump, const void *value) @@ -29,6 +39,7 @@ set_filter_dump_attr_family(struct nfct_filter_dump *filter_dump, const set_filter_dump_attr set_filter_dump_attr_array[NFCT_FILTER_DUMP_MAX] = { [NFCT_FILTER_DUMP_MARK] = set_filter_dump_attr_mark, [NFCT_FILTER_DUMP_L3NUM] = set_filter_dump_attr_family, + [NFCT_FILTER_DUMP_STATUS] = set_filter_dump_attr_status, }; void __build_filter_dump(struct nfnlhdr *req, size_t size, @@ -44,4 +55,10 @@ void __build_filter_dump(struct nfnlhdr *req, size_t size, struct nfgenmsg *nfg = NLMSG_DATA(&req->nlh); nfg->nfgen_family = filter_dump->l3num; } + if (filter_dump->set & (1 << NFCT_FILTER_DUMP_STATUS)) { + nfnl_addattr32(&req->nlh, size, CTA_STATUS, + htonl(filter_dump->status.val)); + nfnl_addattr32(&req->nlh, size, CTA_STATUS_MASK, + htonl(filter_dump->status.mask)); + } } -- cgit v1.2.3