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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:04:34 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-09 13:04:34 +0000
commit371c8a8bca2b6862226bc79c13d143e07c1d8fc3 (patch)
tree06c7dc8826596690422e79d5bde2f46c90492de3 /src/expr/fwd.c
parentInitial commit. (diff)
downloadlibnftnl-upstream.tar.xz
libnftnl-upstream.zip
Adding upstream version 1.2.6.upstream/1.2.6upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to '')
-rw-r--r--src/expr/fwd.c162
1 files changed, 162 insertions, 0 deletions
diff --git a/src/expr/fwd.c b/src/expr/fwd.c
new file mode 100644
index 0000000..51f6612
--- /dev/null
+++ b/src/expr/fwd.c
@@ -0,0 +1,162 @@
+/*
+ * (C) 2015 Pablo Neira Ayuso <pablo@netfilter.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published
+ * by the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ */
+
+#include <stdio.h>
+#include <stdint.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <errno.h>
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <linux/netfilter/nf_tables.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+#include "expr_ops.h"
+#include "data_reg.h"
+
+struct nftnl_expr_fwd {
+ enum nft_registers sreg_dev;
+ enum nft_registers sreg_addr;
+ uint32_t nfproto;
+};
+
+static int nftnl_expr_fwd_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_FWD_SREG_DEV:
+ memcpy(&fwd->sreg_dev, data, sizeof(fwd->sreg_dev));
+ break;
+ case NFTNL_EXPR_FWD_SREG_ADDR:
+ memcpy(&fwd->sreg_addr, data, sizeof(fwd->sreg_addr));
+ break;
+ case NFTNL_EXPR_FWD_NFPROTO:
+ memcpy(&fwd->nfproto, data, sizeof(fwd->nfproto));
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *nftnl_expr_fwd_get(const struct nftnl_expr *e,
+ uint16_t type, uint32_t *data_len)
+{
+ struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_FWD_SREG_DEV:
+ *data_len = sizeof(fwd->sreg_dev);
+ return &fwd->sreg_dev;
+ case NFTNL_EXPR_FWD_SREG_ADDR:
+ *data_len = sizeof(fwd->sreg_addr);
+ return &fwd->sreg_addr;
+ case NFTNL_EXPR_FWD_NFPROTO:
+ *data_len = sizeof(fwd->nfproto);
+ return &fwd->nfproto;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_fwd_cb(const struct nlattr *attr, void *data)
+{
+ const struct nlattr **tb = data;
+ int type = mnl_attr_get_type(attr);
+
+ if (mnl_attr_type_valid(attr, NFTA_FWD_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_FWD_SREG_DEV:
+ case NFTA_FWD_SREG_ADDR:
+ case NFTA_FWD_NFPROTO:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void nftnl_expr_fwd_build(struct nlmsghdr *nlh,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV))
+ mnl_attr_put_u32(nlh, NFTA_FWD_SREG_DEV, htonl(fwd->sreg_dev));
+ if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR))
+ mnl_attr_put_u32(nlh, NFTA_FWD_SREG_ADDR, htonl(fwd->sreg_addr));
+ if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO))
+ mnl_attr_put_u32(nlh, NFTA_FWD_NFPROTO, htonl(fwd->nfproto));
+}
+
+static int nftnl_expr_fwd_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_FWD_MAX + 1] = {};
+ int ret = 0;
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_fwd_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_FWD_SREG_DEV]) {
+ fwd->sreg_dev = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_DEV]));
+ e->flags |= (1 << NFTNL_EXPR_FWD_SREG_DEV);
+ }
+ if (tb[NFTA_FWD_SREG_ADDR]) {
+ fwd->sreg_addr = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_SREG_ADDR]));
+ e->flags |= (1 << NFTNL_EXPR_FWD_SREG_ADDR);
+ }
+ if (tb[NFTA_FWD_NFPROTO]) {
+ fwd->nfproto = ntohl(mnl_attr_get_u32(tb[NFTA_FWD_NFPROTO]));
+ e->flags |= (1 << NFTNL_EXPR_FWD_NFPROTO);
+ }
+
+ return ret;
+}
+
+static int nftnl_expr_fwd_snprintf(char *buf, size_t remain,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_fwd *fwd = nftnl_expr_data(e);
+ int offset = 0, ret;
+
+ if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_DEV)) {
+ ret = snprintf(buf + offset, remain, "sreg_dev %u ",
+ fwd->sreg_dev);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_EXPR_FWD_SREG_ADDR)) {
+ ret = snprintf(buf + offset, remain, "sreg_addr %u ",
+ fwd->sreg_addr);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+ if (e->flags & (1 << NFTNL_EXPR_FWD_NFPROTO)) {
+ ret = snprintf(buf + offset, remain, "nfproto %u ",
+ fwd->nfproto);
+ SNPRINTF_BUFFER_SIZE(ret, remain, offset);
+ }
+
+ return offset;
+}
+
+struct expr_ops expr_ops_fwd = {
+ .name = "fwd",
+ .alloc_len = sizeof(struct nftnl_expr_fwd),
+ .max_attr = NFTA_FWD_MAX,
+ .set = nftnl_expr_fwd_set,
+ .get = nftnl_expr_fwd_get,
+ .parse = nftnl_expr_fwd_parse,
+ .build = nftnl_expr_fwd_build,
+ .output = nftnl_expr_fwd_snprintf,
+};