--- /dev/null
+/*
+ * Copyright (c) 2016 Anders K. Pedersen <akp@cohaesio.com>
+ *
+ * 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 <linux/netfilter/nf_tables.h>
+
+#include "internal.h"
+#include <libmnl/libmnl.h>
+#include <libnftnl/expr.h>
+#include <libnftnl/rule.h>
+
+#ifndef NFT_RT_MAX
+#define NFT_RT_MAX (NFT_RT_NEXTHOP6 + 1)
+#endif
+
+struct nftnl_expr_rt {
+ enum nft_rt_keys key;
+ enum nft_registers dreg;
+};
+
+static int
+nftnl_expr_rt_set(struct nftnl_expr *e, uint16_t type,
+ const void *data, uint32_t data_len)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_RT_KEY:
+ rt->key = *((uint32_t *)data);
+ break;
+ case NFTNL_EXPR_RT_DREG:
+ rt->dreg = *((uint32_t *)data);
+ break;
+ default:
+ return -1;
+ }
+ return 0;
+}
+
+static const void *
+nftnl_expr_rt_get(const struct nftnl_expr *e, uint16_t type,
+ uint32_t *data_len)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ switch (type) {
+ case NFTNL_EXPR_RT_KEY:
+ *data_len = sizeof(rt->key);
+ return &rt->key;
+ case NFTNL_EXPR_RT_DREG:
+ *data_len = sizeof(rt->dreg);
+ return &rt->dreg;
+ }
+ return NULL;
+}
+
+static int nftnl_expr_rt_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_RT_MAX) < 0)
+ return MNL_CB_OK;
+
+ switch (type) {
+ case NFTA_RT_KEY:
+ case NFTA_RT_DREG:
+ if (mnl_attr_validate(attr, MNL_TYPE_U32) < 0)
+ abi_breakage();
+ break;
+ }
+
+ tb[type] = attr;
+ return MNL_CB_OK;
+}
+
+static void
+nftnl_expr_rt_build(struct nlmsghdr *nlh, const struct nftnl_expr *e)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_KEY))
+ mnl_attr_put_u32(nlh, NFTA_RT_KEY, htonl(rt->key));
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG))
+ mnl_attr_put_u32(nlh, NFTA_RT_DREG, htonl(rt->dreg));
+}
+
+static int
+nftnl_expr_rt_parse(struct nftnl_expr *e, struct nlattr *attr)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+ struct nlattr *tb[NFTA_RT_MAX+1] = {};
+
+ if (mnl_attr_parse_nested(attr, nftnl_expr_rt_cb, tb) < 0)
+ return -1;
+
+ if (tb[NFTA_RT_KEY]) {
+ rt->key = ntohl(mnl_attr_get_u32(tb[NFTA_RT_KEY]));
+ e->flags |= (1 << NFTNL_EXPR_RT_KEY);
+ }
+ if (tb[NFTA_RT_DREG]) {
+ rt->dreg = ntohl(mnl_attr_get_u32(tb[NFTA_RT_DREG]));
+ e->flags |= (1 << NFTNL_EXPR_RT_DREG);
+ }
+
+ return 0;
+}
+
+static const char *rt_key2str_array[NFT_RT_MAX] = {
+ [NFT_RT_CLASSID] = "classid",
+ [NFT_RT_NEXTHOP4] = "nexthop4",
+ [NFT_RT_NEXTHOP6] = "nexthop6",
+};
+
+static const char *rt_key2str(uint8_t key)
+{
+ if (key < NFT_RT_MAX)
+ return rt_key2str_array[key];
+
+ return "unknown";
+}
+
+static inline int str2rt_key(const char *str)
+{
+ int i;
+
+ for (i = 0; i < NFT_RT_MAX; i++) {
+ if (strcmp(str, rt_key2str_array[i]) == 0)
+ return i;
+ }
+
+ errno = EINVAL;
+ return -1;
+}
+
+static int nftnl_expr_rt_json_parse(struct nftnl_expr *e, json_t *root,
+ struct nftnl_parse_err *err)
+{
+#ifdef JSON_PARSING
+ const char *val_str;
+ uint32_t reg;
+ int val32;
+
+ val_str = nftnl_jansson_parse_str(root, "key", err);
+ if (val_str != NULL) {
+ val32 = str2rt_key(val_str);
+ if (val32 >= 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_RT_KEY, val32);
+ }
+
+ if (nftnl_jansson_node_exist(root, "dreg")) {
+ if (nftnl_jansson_parse_reg(root, "dreg", NFTNL_TYPE_U32, ®,
+ err) == 0)
+ nftnl_expr_set_u32(e, NFTNL_EXPR_RT_DREG, reg);
+ }
+
+ return 0;
+#else
+ errno = EOPNOTSUPP;
+ return -1;
+#endif
+}
+
+static int
+nftnl_expr_rt_snprintf_default(char *buf, size_t len,
+ const struct nftnl_expr *e)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG)) {
+ return snprintf(buf, len, "load %s => reg %u ",
+ rt_key2str(rt->key), rt->dreg);
+ }
+ return 0;
+}
+
+static int nftnl_expr_rt_export(char *buf, size_t size,
+ const struct nftnl_expr *e, int type)
+{
+ struct nftnl_expr_rt *rt = nftnl_expr_data(e);
+ NFTNL_BUF_INIT(b, buf, size);
+
+ if (e->flags & (1 << NFTNL_EXPR_RT_DREG))
+ nftnl_buf_u32(&b, type, rt->dreg, DREG);
+ if (e->flags & (1 << NFTNL_EXPR_RT_KEY))
+ nftnl_buf_str(&b, type, rt_key2str(rt->key), KEY);
+
+ return nftnl_buf_done(&b);
+}
+
+static int
+nftnl_expr_rt_snprintf(char *buf, size_t len, uint32_t type,
+ uint32_t flags, const struct nftnl_expr *e)
+{
+ switch (type) {
+ case NFTNL_OUTPUT_DEFAULT:
+ return nftnl_expr_rt_snprintf_default(buf, len, e);
+ case NFTNL_OUTPUT_XML:
+ case NFTNL_OUTPUT_JSON:
+ return nftnl_expr_rt_export(buf, len, e, type);
+ default:
+ break;
+ }
+ return -1;
+}
+
+static bool nftnl_expr_rt_cmp(const struct nftnl_expr *e1,
+ const struct nftnl_expr *e2)
+{
+ struct nftnl_expr_rt *r1 = nftnl_expr_data(e1);
+ struct nftnl_expr_rt *r2 = nftnl_expr_data(e2);
+ bool eq = true;
+
+ if (e1->flags & (1 << NFTNL_EXPR_RT_KEY))
+ eq &= (r1->key == r2->key);
+ if (e1->flags & (1 << NFTNL_EXPR_RT_DREG))
+ eq &= (r1->dreg == r2->dreg);
+
+ return eq;
+}
+
+struct expr_ops expr_ops_rt = {
+ .name = "rt",
+ .alloc_len = sizeof(struct nftnl_expr_rt),
+ .max_attr = NFTA_RT_MAX,
+ .cmp = nftnl_expr_rt_cmp,
+ .set = nftnl_expr_rt_set,
+ .get = nftnl_expr_rt_get,
+ .parse = nftnl_expr_rt_parse,
+ .build = nftnl_expr_rt_build,
+ .snprintf = nftnl_expr_rt_snprintf,
+ .json_parse = nftnl_expr_rt_json_parse,
+};
projects / thirdparty / libnftnl.git / commitdiff
