sd-netlink: add nfnetlink helper routines
add nfnetlink_nftables helper functions to: * open a new nfnetlink socket to kernel * add tables, chains, rules, sets and maps * delete/flush table * add and delete elements from sets/maps
This commit is contained in:
Florian Westphal
parent
6f00fd9b7c
commit
347ea16797
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@ -81,6 +81,7 @@ libsystemd_sources = files('''
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sd-netlink/netlink-types.h
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sd-netlink/netlink-util.c
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sd-netlink/netlink-util.h
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sd-netlink/nfnl-message.c
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sd-netlink/rtnl-message.c
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sd-netlink/sd-netlink.c
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sd-network/network-util.c
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@ -0,0 +1,318 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <netinet/in.h>
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#include <linux/if_addrlabel.h>
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#include <linux/netfilter/nfnetlink.h>
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#include <linux/netfilter/nf_tables.h>
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#include <linux/nexthop.h>
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#include <stdbool.h>
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#include <unistd.h>
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#include "sd-netlink.h"
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#include "format-util.h"
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#include "netlink-internal.h"
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#include "netlink-types.h"
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#include "netlink-util.h"
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#include "socket-util.h"
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#include "util.h"
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static int nft_message_new(sd_netlink *nfnl, sd_netlink_message **ret, int family, uint16_t type, uint16_t flags) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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struct nfgenmsg *nfh;
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const NLType *nl_type;
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size_t size;
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int r;
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assert_return(nfnl, -EINVAL);
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r = type_system_root_get_type(nfnl, &nl_type, NFNL_SUBSYS_NFTABLES);
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if (r < 0)
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return r;
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if (type_get_type(nl_type) != NETLINK_TYPE_NESTED)
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return -EINVAL;
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r = message_new_empty(nfnl, &m);
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if (r < 0)
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return r;
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size = NLMSG_SPACE(type_get_size(nl_type));
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assert(size >= sizeof(struct nlmsghdr));
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m->hdr = malloc0(size);
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if (!m->hdr)
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return -ENOMEM;
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m->hdr->nlmsg_flags = NLM_F_REQUEST | flags;
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type_get_type_system(nl_type, &m->containers[0].type_system);
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r = type_system_get_type_system(m->containers[0].type_system,
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&m->containers[0].type_system,
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type);
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if (r < 0)
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return r;
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m->hdr->nlmsg_len = size;
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m->hdr->nlmsg_type = NFNL_SUBSYS_NFTABLES << 8 | type;
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nfh = NLMSG_DATA(m->hdr);
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nfh->nfgen_family = family;
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nfh->version = NFNETLINK_V0;
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nfh->res_id = nfnl->serial;
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*ret = TAKE_PTR(m);
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return 0;
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}
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static int sd_nfnl_message_batch(sd_netlink *nfnl, sd_netlink_message **ret, int v) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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struct nfgenmsg *nfh;
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int r;
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r = message_new(nfnl, &m, v);
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if (r < 0)
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return r;
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nfh = NLMSG_DATA(m->hdr);
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nfh->nfgen_family = AF_UNSPEC;
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nfh->version = NFNETLINK_V0;
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nfh->res_id = NFNL_SUBSYS_NFTABLES;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_message_batch_begin(sd_netlink *nfnl, sd_netlink_message **ret) {
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return sd_nfnl_message_batch(nfnl, ret, NFNL_MSG_BATCH_BEGIN);
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}
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int sd_nfnl_message_batch_end(sd_netlink *nfnl, sd_netlink_message **ret) {
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return sd_nfnl_message_batch(nfnl, ret, NFNL_MSG_BATCH_END);
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}
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int sd_nfnl_nft_message_new_basechain(sd_netlink *nfnl, sd_netlink_message **ret,
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int family,
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const char *table, const char *chain,
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const char *type,
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uint8_t hook, int prio) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_NEWCHAIN, NLM_F_CREATE | NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_CHAIN_TABLE, table);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_CHAIN_NAME, chain);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_CHAIN_TYPE, type);
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if (r < 0)
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return r;
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r = sd_netlink_message_open_container(m, NFTA_CHAIN_HOOK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_u32(m, NFTA_HOOK_HOOKNUM, htobe32(hook));
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if (r < 0)
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goto cancel;
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r = sd_netlink_message_append_u32(m, NFTA_HOOK_PRIORITY, htobe32(prio));
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if (r < 0)
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goto cancel;
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r = sd_netlink_message_close_container(m);
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if (r < 0)
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goto cancel;
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*ret = TAKE_PTR(m);
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return 0;
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cancel:
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sd_netlink_message_cancel_array(m);
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return r;
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}
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int sd_nfnl_nft_message_del_table(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_DELTABLE, NLM_F_CREATE | NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_TABLE_NAME, table);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_nft_message_new_table(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, uint16_t flags) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_NEWTABLE, NLM_F_CREATE | flags);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_TABLE_NAME, table);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_nft_message_new_rule(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *chain) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_NEWRULE, NLM_F_CREATE | NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_RULE_TABLE, table);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_RULE_CHAIN, chain);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_nft_message_new_set(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name,
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uint32_t set_id, uint32_t klen) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_NEWSET, NLM_F_CREATE | NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_TABLE, table);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_NAME, set_name);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_u32(m, NFTA_SET_ID, ++set_id);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_u32(m, NFTA_SET_KEY_LEN, htobe32(klen));
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_nft_message_new_setelems_begin(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_NEWSETELEM, NLM_F_CREATE | NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_ELEM_LIST_TABLE, table);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_ELEM_LIST_SET, set_name);
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if (r < 0)
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return r;
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r = sd_netlink_message_open_container(m, NFTA_SET_ELEM_LIST_ELEMENTS);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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int sd_nfnl_nft_message_del_setelems_begin(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name) {
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_cleanup_(sd_netlink_message_unrefp) sd_netlink_message *m = NULL;
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int r;
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r = nft_message_new(nfnl, &m, family, NFT_MSG_DELSETELEM, NLM_F_ACK);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_ELEM_LIST_TABLE, table);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_string(m, NFTA_SET_ELEM_LIST_SET, set_name);
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if (r < 0)
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return r;
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r = sd_netlink_message_open_container(m, NFTA_SET_ELEM_LIST_ELEMENTS);
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if (r < 0)
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return r;
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*ret = TAKE_PTR(m);
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return r;
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}
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static int sd_nfnl_add_data(sd_netlink_message *m, uint16_t attr, const void *data, uint32_t dlen) {
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int r = sd_netlink_message_open_container(m, attr);
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if (r < 0)
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return r;
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r = sd_netlink_message_append_data(m, NFTA_DATA_VALUE, data, dlen);
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if (r < 0)
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return r;
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return sd_netlink_message_close_container(m); /* attr */
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}
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int sd_nfnl_nft_message_add_setelem(sd_netlink_message *m,
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uint32_t num,
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const void *key, uint32_t klen,
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const void *data, uint32_t dlen) {
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int r;
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r = sd_netlink_message_open_array(m, num);
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if (r < 0)
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return r;
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r = sd_nfnl_add_data(m, NFTA_SET_ELEM_KEY, key, klen);
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if (r < 0)
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goto cancel;
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if (data) {
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r = sd_nfnl_add_data(m, NFTA_SET_ELEM_DATA, data, dlen);
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if (r < 0)
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goto cancel;
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}
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return r;
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cancel:
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sd_netlink_message_cancel_array(m);
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return r;
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}
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int sd_nfnl_nft_message_add_setelem_end(sd_netlink_message *m) {
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return sd_netlink_message_close_container(m); /* NFTA_SET_ELEM_LIST_ELEMENTS */
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}
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int sd_nfnl_socket_open(sd_netlink **ret) {
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return netlink_open_family(ret, NETLINK_NETFILTER);
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}
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@ -219,6 +219,32 @@ int sd_rtnl_message_set_tclass_handle(sd_netlink_message *m, uint32_t handle);
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int sd_rtnl_message_new_mdb(sd_netlink *rtnl, sd_netlink_message **ret, uint16_t nlmsg_type, int mdb_ifindex);
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/* nfnl */
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int sd_nfnl_socket_open(sd_netlink **nl);
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int sd_nfnl_message_batch_begin(sd_netlink *nfnl, sd_netlink_message **ret);
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int sd_nfnl_message_batch_end(sd_netlink *nfnl, sd_netlink_message **ret);
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int sd_nfnl_nft_message_del_table(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table);
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int sd_nfnl_nft_message_new_table(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, uint16_t nl_flags);
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int sd_nfnl_nft_message_new_basechain(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *chain,
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const char *type, uint8_t hook, int prio);
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int sd_nfnl_nft_message_new_rule(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *chain);
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int sd_nfnl_nft_message_new_set(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name,
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uint32_t setid, uint32_t klen);
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int sd_nfnl_nft_message_new_setelems_begin(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name);
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int sd_nfnl_nft_message_del_setelems_begin(sd_netlink *nfnl, sd_netlink_message **ret,
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int family, const char *table, const char *set_name);
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int sd_nfnl_nft_message_add_setelem(sd_netlink_message *m,
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uint32_t num,
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const void *key, uint32_t klen,
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const void *data, uint32_t dlen);
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int sd_nfnl_nft_message_add_setelem_end(sd_netlink_message *m);
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/* genl */
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int sd_genl_socket_open(sd_netlink **nl);
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int sd_genl_message_new(sd_netlink *nl, sd_genl_family family, uint8_t cmd, sd_netlink_message **m);
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