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GET /api/patches/2225807/?format=api
{ "id": 2225807, "url": "http://patchwork.ozlabs.org/api/patches/2225807/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260421155957.7065-1-fmancera@suse.de/", "project": { "id": 26, "url": "http://patchwork.ozlabs.org/api/projects/26/?format=api", "name": "Netfilter Development", "link_name": "netfilter-devel", "list_id": "netfilter-devel.vger.kernel.org", "list_email": "netfilter-devel@vger.kernel.org", "web_url": null, "scm_url": null, "webscm_url": null, "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260421155957.7065-1-fmancera@suse.de>", "list_archive_url": null, "date": "2026-04-21T15:59:57", "name": "[libnftnl,v4] expr: add support to math expression", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "1cc1bd84c0310e43d8a3a174f7c800e661688e5e", "submitter": { "id": 90904, "url": "http://patchwork.ozlabs.org/api/people/90904/?format=api", "name": "Fernando Fernandez Mancera", "email": "fmancera@suse.de" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/netfilter-devel/patch/20260421155957.7065-1-fmancera@suse.de/mbox/", "series": [ { "id": 500844, "url": "http://patchwork.ozlabs.org/api/series/500844/?format=api", "web_url": "http://patchwork.ozlabs.org/project/netfilter-devel/list/?series=500844", "date": "2026-04-21T15:59:57", "name": "[libnftnl,v4] expr: add support to math expression", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/500844/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2225807/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2225807/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "\n <netfilter-devel+bounces-12113-incoming=patchwork.ozlabs.org@vger.kernel.org>", "X-Original-To": [ "incoming@patchwork.ozlabs.org", "netfilter-devel@vger.kernel.org" ], "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", 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h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n\tbh=uCH6vOyrfDmMEajra3XyTxKqzgr1LRN6ZT+DCOMK4EI=;\n\tb=KjZHgkytPLedrwEEI/qLzDfko9N2ack7LFQKFok2gr2HIn5JpI8PjesOJW2kFQOOyoKG23\n\tSH64hFBcDZuBVmPBq94ty/xaSVu7CWn6pvC+55/AFCBxmq4tTx5EI04AeR1XjHdof+sI/t\n\tv4OnnddAdv3gfD+YWYirCJnSHKLi1Fc=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n\ts=susede2_ed25519; t=1776787214;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n\tbh=uCH6vOyrfDmMEajra3XyTxKqzgr1LRN6ZT+DCOMK4EI=;\n\tb=2ejZoXkPVqB2AKTzBswXCwws0uSeNQdZZRt90gF3YAMDzlZ5YKRVhGSSIbaHp/kUmAjOp9\n\tZ2q8WUf2Wnon9CCA==", "v=1; a=rsa-sha256; c=relaxed/relaxed; d=suse.de;\n s=susede2_rsa;\n\tt=1776787214;\n h=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n\tbh=uCH6vOyrfDmMEajra3XyTxKqzgr1LRN6ZT+DCOMK4EI=;\n\tb=KjZHgkytPLedrwEEI/qLzDfko9N2ack7LFQKFok2gr2HIn5JpI8PjesOJW2kFQOOyoKG23\n\tSH64hFBcDZuBVmPBq94ty/xaSVu7CWn6pvC+55/AFCBxmq4tTx5EI04AeR1XjHdof+sI/t\n\tv4OnnddAdv3gfD+YWYirCJnSHKLi1Fc=", "v=1; a=ed25519-sha256; c=relaxed/relaxed; d=suse.de;\n\ts=susede2_ed25519; t=1776787214;\n\th=from:from:reply-to:date:date:message-id:message-id:to:to:cc:cc:\n\t mime-version:mime-version:\n content-transfer-encoding:content-transfer-encoding;\n\tbh=uCH6vOyrfDmMEajra3XyTxKqzgr1LRN6ZT+DCOMK4EI=;\n\tb=2ejZoXkPVqB2AKTzBswXCwws0uSeNQdZZRt90gF3YAMDzlZ5YKRVhGSSIbaHp/kUmAjOp9\n\tZ2q8WUf2Wnon9CCA==" ], "From": "Fernando Fernandez Mancera <fmancera@suse.de>", "To": "netfilter-devel@vger.kernel.org", "Cc": "coreteam@netfilter.org,\n\tphil@nwl.cc,\n\tfw@strlen.de,\n\tpablo@netfilter.org,\n\tFernando Fernandez Mancera <fmancera@suse.de>", "Subject": "[PATCH libnftnl v4] expr: add support to math expression", "Date": "Tue, 21 Apr 2026 17:59:57 +0200", "Message-ID": "<20260421155957.7065-1-fmancera@suse.de>", "X-Mailer": "git-send-email 2.51.0", "Precedence": "bulk", "X-Mailing-List": "netfilter-devel@vger.kernel.org", "List-Id": "<netfilter-devel.vger.kernel.org>", "List-Subscribe": "<mailto:netfilter-devel+subscribe@vger.kernel.org>", "List-Unsubscribe": "<mailto:netfilter-devel+unsubscribe@vger.kernel.org>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "X-Spamd-Result": "default: False [-2.80 / 50.00];\n\tBAYES_HAM(-3.00)[100.00%];\n\tMID_CONTAINS_FROM(1.00)[];\n\tNEURAL_HAM_LONG(-1.00)[-1.000];\n\tR_MISSING_CHARSET(0.50)[];\n\tNEURAL_HAM_SHORT(-0.20)[-1.000];\n\tMIME_GOOD(-0.10)[text/plain];\n\tRCVD_VIA_SMTP_AUTH(0.00)[];\n\tMIME_TRACE(0.00)[0:+];\n\tTO_DN_SOME(0.00)[];\n\tARC_NA(0.00)[];\n\tFUZZY_RATELIMITED(0.00)[rspamd.com];\n\tDKIM_SIGNED(0.00)[suse.de:s=susede2_rsa,suse.de:s=susede2_ed25519];\n\tTO_MATCH_ENVRCPT_ALL(0.00)[];\n\tFROM_HAS_DN(0.00)[];\n\tRCPT_COUNT_FIVE(0.00)[6];\n\tFROM_EQ_ENVFROM(0.00)[];\n\tRCVD_COUNT_TWO(0.00)[2];\n\tRCVD_TLS_ALL(0.00)[]", "X-Spam-Flag": "NO", "X-Spam-Score": "-2.80", "X-Spam-Level": "" }, "content": "Signed-off-by: Fernando Fernandez Mancera <fmancera@suse.de>\n---\nv2: adjusted the new fields and fixed the duplicated \"math\" on print\nv3: removed NFTNL_EXPR_MATH_LEN and simplified printing\nv4: adjusted byteordering, both bitmask and op are u32\n---\n include/libnftnl/expr.h | 8 ++\n include/linux/netfilter/nf_tables.h | 25 ++++\n src/Makefile.am | 1 +\n src/expr/math.c | 178 ++++++++++++++++++++++++++++\n src/expr_ops.c | 2 +\n 5 files changed, 214 insertions(+)\n create mode 100644 src/expr/math.c", "diff": "diff --git a/include/libnftnl/expr.h b/include/libnftnl/expr.h\nindex 41e9f30..e21752f 100644\n--- a/include/libnftnl/expr.h\n+++ b/include/libnftnl/expr.h\n@@ -364,6 +364,14 @@ enum {\n \t__NFTNL_EXPR_INNER_MAX\n };\n \n+enum {\n+\tNFTNL_EXPR_MATH_SREG\t= NFTNL_EXPR_BASE,\n+\tNFTNL_EXPR_MATH_DREG,\n+\tNFTNL_EXPR_MATH_OP,\n+\tNFTNL_EXPR_MATH_BITMASK,\n+\t__NFTNL_EXPR_MATH_MAX\n+};\n+\n #ifdef __cplusplus\n } /* extern \"C\" */\n #endif\ndiff --git a/include/linux/netfilter/nf_tables.h b/include/linux/netfilter/nf_tables.h\nindex 7c0c915..ee8df9a 100644\n--- a/include/linux/netfilter/nf_tables.h\n+++ b/include/linux/netfilter/nf_tables.h\n@@ -2015,4 +2015,29 @@ enum nft_tunnel_attributes {\n };\n #define NFTA_TUNNEL_MAX\t(__NFTA_TUNNEL_MAX - 1)\n \n+/**\n+ * enum nft_math_attributes - nftables math expression netlink attributes\n+ *\n+ * @NFTA_MATH_SREG: source register (NLA_U32: nft_registers)\n+ * @NFTA_MATH_DREG: destination register (NLA_U32: nft_registers)\n+ * @NFTA_MATH_OP: operation to be performed (NLA_U32)\n+ * @NFTA_MATH_BITMASK: bitmask to be applied on the operation (NLA_U32)\n+ */\n+enum nft_math_attributes {\n+\tNFTA_MATH_UNSPEC,\n+\tNFTA_MATH_SREG,\n+\tNFTA_MATH_DREG,\n+\tNFTA_MATH_OP,\n+\tNFTA_MATH_BITMASK,\n+\t__NFTA_MATH_MAX,\n+};\n+#define NFTA_MATH_MAX (__NFTA_MATH_MAX - 1)\n+\n+enum nft_math_op {\n+\tNFT_MATH_OP_INC,\n+\tNFT_MATH_OP_DEC,\n+\t__NFT_MATH_OP_MAX,\n+};\n+#define NFT_MATH_OP_MAX (__NFT_MATH_OP_MAX - 1)\n+\n #endif /* _LINUX_NF_TABLES_H */\ndiff --git a/src/Makefile.am b/src/Makefile.am\nindex 1c38d00..90eafc4 100644\n--- a/src/Makefile.am\n+++ b/src/Makefile.am\n@@ -62,6 +62,7 @@ libnftnl_la_SOURCES = utils.c\t\t\\\n \t\t expr/synproxy.c\t\\\n \t\t expr/osf.c\t\\\n \t\t expr/xfrm.c\t\\\n+\t\t expr/math.c\t\\\n \t\t obj/counter.c\t\\\n \t\t obj/ct_helper.c\t\\\n \t\t obj/quota.c\t\\\ndiff --git a/src/expr/math.c b/src/expr/math.c\nnew file mode 100644\nindex 0000000..2658e91\n--- /dev/null\n+++ b/src/expr/math.c\n@@ -0,0 +1,178 @@\n+/* SPDX-License-Identifier: GPL-2.0-or-later */\n+/*\n+ * (C) 2025 by Fernando Fernandez Mancera <fmancera@suse.de>\n+ */\n+\n+#include <arpa/inet.h>\n+#include <linux/netfilter/nf_tables.h>\n+\n+#include \"internal.h\"\n+#include <libmnl/libmnl.h>\n+#include <libnftnl/expr.h>\n+#include <libnftnl/rule.h>\n+\n+struct nftnl_expr_math {\n+\tenum nft_registers sreg;\n+\tenum nft_registers dreg;\n+\tenum nft_math_op op;\n+\tuint32_t\t bitmask;\n+};\n+\n+static int nftnl_expr_math_set(struct nftnl_expr *e, uint16_t type,\n+\t\t\t const void *data, uint32_t data_len,\n+\t\t\t uint32_t byteorder)\n+{\n+\tstruct nftnl_expr_math *math = nftnl_expr_data(e);\n+\n+\tswitch(type) {\n+\tcase NFTNL_EXPR_MATH_SREG:\n+\t\tmemcpy(&math->sreg, data, data_len);\n+\t\tbreak;\n+\tcase NFTNL_EXPR_MATH_DREG:\n+\t\tmemcpy(&math->dreg, data, data_len);\n+\t\tbreak;\n+\tcase NFTNL_EXPR_MATH_OP:\n+\t\tmemcpy(&math->op, data, data_len);\n+\t\tbreak;\n+\tcase NFTNL_EXPR_MATH_BITMASK:\n+\t\tmemcpy(&math->bitmask, data, data_len);\n+\t\tbreak;\n+\t}\n+\treturn 0;\n+}\n+\n+static const void *\n+nftnl_expr_math_get(const struct nftnl_expr *e, uint16_t type,\n+\t\t uint32_t *data_len)\n+{\n+\tstruct nftnl_expr_math *math = nftnl_expr_data(e);\n+\n+\tswitch(type) {\n+\tcase NFTNL_EXPR_MATH_SREG:\n+\t\t*data_len = sizeof(math->sreg);\n+\t\treturn &math->sreg;\n+\tcase NFTNL_EXPR_MATH_DREG:\n+\t\t*data_len = sizeof(math->dreg);\n+\t\treturn &math->dreg;\n+\tcase NFTNL_EXPR_MATH_OP:\n+\t\t*data_len = sizeof(math->op);\n+\t\treturn &math->op;\n+\tcase NFTNL_EXPR_MATH_BITMASK:\n+\t\t*data_len = sizeof(math->bitmask);\n+\t\treturn &math->bitmask;\n+\t}\n+\treturn NULL;\n+}\n+\n+static void\n+nftnl_expr_math_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)\n+{\n+\tstruct nftnl_expr_math *math = nftnl_expr_data(e);\n+\n+\tif ((e->flags & (1 << NFTNL_EXPR_MATH_SREG)) &&\n+\t (e->flags & (1 << NFTNL_EXPR_MATH_DREG)) &&\n+\t (e->flags & (1 << NFTNL_EXPR_MATH_BITMASK)) &&\n+\t (e->flags & (1 << NFTNL_EXPR_MATH_OP))) {\n+\t\tmnl_attr_put_u32(nlh, NFTA_MATH_BITMASK, math->bitmask);\n+\t\tmnl_attr_put_u32(nlh, NFTA_MATH_SREG, htonl(math->sreg));\n+\t\tmnl_attr_put_u32(nlh, NFTA_MATH_DREG, htonl(math->dreg));\n+\t\tmnl_attr_put_u32(nlh, NFTA_MATH_OP, math->op);\n+\t}\n+\n+}\n+\n+static int nftnl_expr_math_cb(const struct nlattr *attr, void *data)\n+{\n+\tconst struct nlattr **tb = data;\n+\tint type = mnl_attr_get_type(attr);\n+\n+\tif (mnl_attr_type_valid(attr, NFTA_MATH_MAX) < 0)\n+\t\treturn MNL_CB_OK;\n+\n+\tswitch(type) {\n+\tcase NFTNL_EXPR_MATH_SREG:\n+\tcase NFTNL_EXPR_MATH_DREG:\n+\tcase NFTNL_EXPR_MATH_BITMASK:\n+\tcase NFTNL_EXPR_MATH_OP:\n+\t\tif (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)\n+\t\t\tabi_breakage();\n+\t\tbreak;\n+\t}\n+\n+\ttb[type] = attr;\n+\treturn MNL_CB_OK;\n+}\n+\n+static int\n+nftnl_expr_math_parse(struct nftnl_expr *e, struct nlattr *attr)\n+{\n+\tstruct nftnl_expr_math *math = nftnl_expr_data(e);\n+\tstruct nlattr *tb[NFTA_MATH_MAX + 1] = {};\n+\n+\tif (mnl_attr_parse_nested(attr, nftnl_expr_math_cb, tb) < 0)\n+\t\treturn -1;\n+\n+\tif (tb[NFTA_MATH_SREG]) {\n+\t\tmath->sreg = ntohl(mnl_attr_get_u32(tb[NFTA_MATH_SREG]));\n+\t\te->flags |= (1 << NFTNL_EXPR_MATH_SREG);\n+\t}\n+\n+\tif (tb[NFTA_MATH_DREG]) {\n+\t\tmath->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_MATH_DREG]));\n+\t\te->flags |= (1 << NFTNL_EXPR_MATH_DREG);\n+\t}\n+\n+\tif (tb[NFTA_MATH_OP]) {\n+\t\tmath->op = mnl_attr_get_u32(tb[NFTA_MATH_OP]);\n+\t\te->flags |= (1 << NFTNL_EXPR_MATH_OP);\n+\t}\n+\n+\tif (tb[NFTA_MATH_BITMASK]) {\n+\t\tmath->bitmask = mnl_attr_get_u32(tb[NFTA_MATH_BITMASK]);\n+\t\te->flags |= (1 << NFTNL_EXPR_MATH_BITMASK);\n+\t}\n+\n+\treturn 0;\n+}\n+\n+static const char op2char(enum nft_math_op op)\n+{\n+\tswitch (op) {\n+\tcase NFT_MATH_OP_INC:\n+\t\treturn '+';\n+\tcase NFT_MATH_OP_DEC:\n+\t\treturn '-';\n+\tdefault:\n+\t\treturn '?';\n+\t}\n+}\n+\n+static int\n+nftnl_expr_math_snprintf(char *buf, size_t len,\n+\t\t\t uint32_t flags, const struct nftnl_expr *e)\n+{\n+\tstruct nftnl_expr_math *math = nftnl_expr_data(e);\n+\n+\treturn snprintf(buf, len, \"mask 0x%.8x reg %u %c 1 => %u\",\n+\t\t\tmath->bitmask, math->sreg, op2char(math->op),\n+\t\t\tmath->dreg);\n+}\n+\n+static struct attr_policy math_attr_policy[__NFTNL_EXPR_MATH_MAX] = {\n+\t[NFTNL_EXPR_MATH_SREG]\t\t= { .maxlen = sizeof(uint32_t) },\n+\t[NFTNL_EXPR_MATH_DREG]\t\t= { .maxlen = sizeof(uint32_t) },\n+\t[NFTNL_EXPR_MATH_BITMASK]\t= { .maxlen = sizeof(uint32_t) },\n+\t[NFTNL_EXPR_MATH_OP]\t\t= { .maxlen = sizeof(uint32_t) },\n+};\n+\n+struct expr_ops expr_ops_math = {\n+\t.name\t\t= \"math\",\n+\t.alloc_len\t= sizeof(struct nftnl_expr_math),\n+\t.nftnl_max_attr\t= __NFTNL_EXPR_MATH_MAX - 1,\n+\t.attr_policy\t= math_attr_policy,\n+\t.set\t\t= nftnl_expr_math_set,\n+\t.get\t\t= nftnl_expr_math_get,\n+\t.parse\t\t= nftnl_expr_math_parse,\n+\t.build\t\t= nftnl_expr_math_build,\n+\t.output\t\t= nftnl_expr_math_snprintf,\n+};\ndiff --git a/src/expr_ops.c b/src/expr_ops.c\nindex b85f472..b654fa0 100644\n--- a/src/expr_ops.c\n+++ b/src/expr_ops.c\n@@ -43,6 +43,7 @@ extern struct expr_ops expr_ops_synproxy;\n extern struct expr_ops expr_ops_tunnel;\n extern struct expr_ops expr_ops_osf;\n extern struct expr_ops expr_ops_xfrm;\n+extern struct expr_ops expr_ops_math;\n \n static struct expr_ops expr_ops_notrack = {\n \t.name\t= \"notrack\",\n@@ -89,6 +90,7 @@ static struct expr_ops *expr_ops[] = {\n \t&expr_ops_tunnel,\n \t&expr_ops_osf,\n \t&expr_ops_xfrm,\n+\t&expr_ops_math,\n \tNULL,\n };\n \n", "prefixes": [ "libnftnl", "v4" ] }