/* * 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> 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: memcpy(&rt->key, data, sizeof(rt->key)); break; case NFTNL_EXPR_RT_DREG: memcpy(&rt->dreg, data, sizeof(rt->dreg)); 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 + 1] = { [NFT_RT_CLASSID] = "classid", [NFT_RT_NEXTHOP4] = "nexthop4", [NFT_RT_NEXTHOP6] = "nexthop6", [NFT_RT_TCPMSS] = "tcpmss", [NFT_RT_XFRM] = "ipsec", }; 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_snprintf(char *buf, size_t len, uint32_t flags, 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; } struct expr_ops expr_ops_rt = { .name = "rt", .alloc_len = sizeof(struct nftnl_expr_rt), .max_attr = NFTA_RT_MAX, .set = nftnl_expr_rt_set, .get = nftnl_expr_rt_get, .parse = nftnl_expr_rt_parse, .build = nftnl_expr_rt_build, .output = nftnl_expr_rt_snprintf, };