mirror of
https://github.com/openharmony/third_party_iptables.git
synced 2026-07-18 16:54:38 -04:00
HuangHaitao
4055 lines
92 KiB
C
4055 lines
92 KiB
C
/*
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* (C) 2012 by Pablo Neira Ayuso <pablo@netfilter.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published
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* by the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This code has been sponsored by Sophos Astaro <http://www.sophos.com>
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*/
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#include <unistd.h>
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#include <fcntl.h>
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#include <sys/types.h>
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#include <sys/socket.h>
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#include <stdbool.h>
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#include <errno.h>
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#include <netdb.h> /* getprotobynumber */
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#include <time.h>
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#include <stdarg.h>
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#include <inttypes.h>
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#include <assert.h>
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#include <xtables.h>
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#include <libiptc/libxtc.h>
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#include <libiptc/xtcshared.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/netfilter/x_tables.h>
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#include <linux/netfilter_ipv4/ip_tables.h>
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#include <linux/netfilter_ipv6/ip6_tables.h>
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#include <netinet/ip6.h>
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#include <linux/netlink.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/netfilter/nf_tables_compat.h>
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#include <linux/netfilter/xt_limit.h>
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#include <linux/netfilter/xt_NFLOG.h>
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#include <linux/netfilter/xt_mark.h>
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#include <libmnl/libmnl.h>
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#include <libnftnl/gen.h>
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#include <libnftnl/table.h>
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#include <libnftnl/chain.h>
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#include <libnftnl/rule.h>
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#include <libnftnl/expr.h>
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#include <libnftnl/set.h>
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#include <libnftnl/udata.h>
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#include <libnftnl/batch.h>
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#include <netinet/in.h> /* inet_ntoa */
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#include <arpa/inet.h>
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#include "nft.h"
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#include "xshared.h" /* proto_to_name */
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#include "nft-cache.h"
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#include "nft-shared.h"
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#include "nft-bridge.h" /* EBT_NOPROTO */
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static void *nft_fn;
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int mnl_talk(struct nft_handle *h, struct nlmsghdr *nlh,
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int (*cb)(const struct nlmsghdr *nlh, void *data),
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void *data)
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{
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int ret;
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char buf[32768];
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if (mnl_socket_sendto(h->nl, nlh, nlh->nlmsg_len) < 0)
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return -1;
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ret = mnl_socket_recvfrom(h->nl, buf, sizeof(buf));
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while (ret > 0) {
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ret = mnl_cb_run(buf, ret, h->seq, h->portid, cb, data);
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if (ret <= 0)
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break;
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ret = mnl_socket_recvfrom(h->nl, buf, sizeof(buf));
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}
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if (ret == -1) {
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return -1;
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}
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return 0;
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}
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#define NFT_NLMSG_MAXSIZE (UINT16_MAX + getpagesize())
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/* Selected batch page is 2 Mbytes long to support loading a ruleset of 3.5M
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* rules matching on source and destination address as well as input and output
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* interfaces. This is what legacy iptables supports.
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*/
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#define BATCH_PAGE_SIZE 2 * 1024 * 1024
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static struct nftnl_batch *mnl_batch_init(void)
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{
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struct nftnl_batch *batch;
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batch = nftnl_batch_alloc(BATCH_PAGE_SIZE, NFT_NLMSG_MAXSIZE);
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if (batch == NULL)
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return NULL;
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return batch;
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}
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static void mnl_nft_batch_continue(struct nftnl_batch *batch)
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{
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int ret = nftnl_batch_update(batch);
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assert(ret >= 0);
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}
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static uint32_t mnl_batch_begin(struct nftnl_batch *batch, uint32_t genid, uint32_t seqnum)
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{
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struct nlmsghdr *nlh;
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nlh = nftnl_batch_begin(nftnl_batch_buffer(batch), seqnum);
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mnl_attr_put_u32(nlh, NFTA_GEN_ID, htonl(genid));
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mnl_nft_batch_continue(batch);
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return seqnum;
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}
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static void mnl_batch_end(struct nftnl_batch *batch, uint32_t seqnum)
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{
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nftnl_batch_end(nftnl_batch_buffer(batch), seqnum);
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mnl_nft_batch_continue(batch);
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}
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static void mnl_batch_reset(struct nftnl_batch *batch)
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{
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nftnl_batch_free(batch);
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}
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struct mnl_err {
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struct list_head head;
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int err;
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uint32_t seqnum;
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};
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static void mnl_err_list_node_add(struct list_head *err_list, int error,
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int seqnum)
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{
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struct mnl_err *err = xtables_malloc(sizeof(struct mnl_err));
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err->seqnum = seqnum;
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err->err = error;
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list_add_tail(&err->head, err_list);
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}
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static void mnl_err_list_free(struct mnl_err *err)
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{
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list_del(&err->head);
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free(err);
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}
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static void mnl_set_sndbuffer(struct nft_handle *h)
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{
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int newbuffsiz = nftnl_batch_iovec_len(h->batch) * BATCH_PAGE_SIZE;
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if (newbuffsiz <= h->nlsndbuffsiz)
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return;
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/* Rise sender buffer length to avoid hitting -EMSGSIZE */
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if (setsockopt(mnl_socket_get_fd(h->nl), SOL_SOCKET, SO_SNDBUFFORCE,
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&newbuffsiz, sizeof(socklen_t)) < 0)
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return;
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h->nlsndbuffsiz = newbuffsiz;
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}
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static void mnl_set_rcvbuffer(struct nft_handle *h, int numcmds)
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{
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int newbuffsiz = getpagesize() * numcmds;
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if (newbuffsiz <= h->nlrcvbuffsiz)
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return;
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/* Rise receiver buffer length to avoid hitting -ENOBUFS */
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if (setsockopt(mnl_socket_get_fd(h->nl), SOL_SOCKET, SO_RCVBUFFORCE,
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&newbuffsiz, sizeof(socklen_t)) < 0)
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return;
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h->nlrcvbuffsiz = newbuffsiz;
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}
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static ssize_t mnl_nft_socket_sendmsg(struct nft_handle *h, int numcmds)
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{
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static const struct sockaddr_nl snl = {
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.nl_family = AF_NETLINK
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};
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uint32_t iov_len = nftnl_batch_iovec_len(h->batch);
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struct iovec iov[iov_len];
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struct msghdr msg = {
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.msg_name = (struct sockaddr *) &snl,
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.msg_namelen = sizeof(snl),
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.msg_iov = iov,
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.msg_iovlen = iov_len,
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};
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mnl_set_sndbuffer(h);
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mnl_set_rcvbuffer(h, numcmds);
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nftnl_batch_iovec(h->batch, iov, iov_len);
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return sendmsg(mnl_socket_get_fd(h->nl), &msg, 0);
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}
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static int mnl_batch_talk(struct nft_handle *h, int numcmds)
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{
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const struct mnl_socket *nl = h->nl;
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int ret, fd = mnl_socket_get_fd(nl), portid = mnl_socket_get_portid(nl);
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char rcv_buf[MNL_SOCKET_BUFFER_SIZE];
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fd_set readfds;
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struct timeval tv = {
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.tv_sec = 0,
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.tv_usec = 0
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};
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int err = 0;
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ret = mnl_nft_socket_sendmsg(h, numcmds);
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if (ret == -1) {
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fprintf(stderr, "sendmsg() failed: %s\n", strerror(errno));
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return -1;
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}
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FD_ZERO(&readfds);
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FD_SET(fd, &readfds);
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/* receive and digest all the acknowledgments from the kernel. */
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ret = select(fd+1, &readfds, NULL, NULL, &tv);
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if (ret == -1)
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return -1;
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while (ret > 0 && FD_ISSET(fd, &readfds)) {
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struct nlmsghdr *nlh = (struct nlmsghdr *)rcv_buf;
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ret = mnl_socket_recvfrom(nl, rcv_buf, sizeof(rcv_buf));
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if (ret == -1)
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return -1;
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ret = mnl_cb_run(rcv_buf, ret, 0, portid, NULL, NULL);
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/* Continue on error, make sure we get all acknowledgments */
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if (ret == -1) {
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mnl_err_list_node_add(&h->err_list, errno,
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nlh->nlmsg_seq);
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err = -1;
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}
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ret = select(fd+1, &readfds, NULL, NULL, &tv);
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if (ret == -1)
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return -1;
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FD_ZERO(&readfds);
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FD_SET(fd, &readfds);
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}
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return err;
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}
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enum obj_action {
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NFT_COMPAT_COMMIT,
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NFT_COMPAT_ABORT,
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};
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struct obj_update {
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struct list_head head;
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enum obj_update_type type:8;
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uint8_t skip:1;
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unsigned int seq;
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union {
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struct nftnl_table *table;
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struct nftnl_chain *chain;
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struct nftnl_rule *rule;
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struct nftnl_set *set;
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void *ptr;
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};
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struct {
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unsigned int lineno;
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} error;
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};
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static int mnl_append_error(const struct nft_handle *h,
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const struct obj_update *o,
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const struct mnl_err *err,
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char *buf, unsigned int len)
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{
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static const char *type_name[] = {
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[NFT_COMPAT_TABLE_ADD] = "TABLE_ADD",
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[NFT_COMPAT_TABLE_FLUSH] = "TABLE_FLUSH",
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[NFT_COMPAT_CHAIN_ADD] = "CHAIN_ADD",
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[NFT_COMPAT_CHAIN_USER_ADD] = "CHAIN_USER_ADD",
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[NFT_COMPAT_CHAIN_DEL] = "CHAIN_DEL",
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[NFT_COMPAT_CHAIN_USER_FLUSH] = "CHAIN_USER_FLUSH",
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[NFT_COMPAT_CHAIN_UPDATE] = "CHAIN_UPDATE",
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[NFT_COMPAT_CHAIN_RENAME] = "CHAIN_RENAME",
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[NFT_COMPAT_CHAIN_ZERO] = "CHAIN_ZERO",
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[NFT_COMPAT_RULE_APPEND] = "RULE_APPEND",
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[NFT_COMPAT_RULE_INSERT] = "RULE_INSERT",
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[NFT_COMPAT_RULE_REPLACE] = "RULE_REPLACE",
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[NFT_COMPAT_RULE_DELETE] = "RULE_DELETE",
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[NFT_COMPAT_RULE_FLUSH] = "RULE_FLUSH",
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[NFT_COMPAT_SET_ADD] = "SET_ADD",
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};
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char errmsg[256];
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char tcr[128];
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if (o->error.lineno)
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snprintf(errmsg, sizeof(errmsg), "\nline %u: %s failed (%s)",
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o->error.lineno, type_name[o->type], strerror(err->err));
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else
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snprintf(errmsg, sizeof(errmsg), " %s failed (%s)",
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type_name[o->type], strerror(err->err));
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switch (o->type) {
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case NFT_COMPAT_TABLE_ADD:
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case NFT_COMPAT_TABLE_FLUSH:
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snprintf(tcr, sizeof(tcr), "table %s",
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nftnl_table_get_str(o->table, NFTNL_TABLE_NAME));
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break;
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case NFT_COMPAT_CHAIN_ADD:
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case NFT_COMPAT_CHAIN_ZERO:
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case NFT_COMPAT_CHAIN_USER_ADD:
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case NFT_COMPAT_CHAIN_DEL:
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case NFT_COMPAT_CHAIN_USER_FLUSH:
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case NFT_COMPAT_CHAIN_UPDATE:
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case NFT_COMPAT_CHAIN_RENAME:
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snprintf(tcr, sizeof(tcr), "chain %s",
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nftnl_chain_get_str(o->chain, NFTNL_CHAIN_NAME));
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break;
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case NFT_COMPAT_RULE_APPEND:
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case NFT_COMPAT_RULE_INSERT:
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case NFT_COMPAT_RULE_REPLACE:
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case NFT_COMPAT_RULE_DELETE:
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case NFT_COMPAT_RULE_FLUSH:
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case NFT_COMPAT_RULE_CHANGE_COUNTERS:
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snprintf(tcr, sizeof(tcr), "rule in chain %s",
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nftnl_rule_get_str(o->rule, NFTNL_RULE_CHAIN));
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#if 0
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{
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nft_rule_print_save(h, o->rule, NFT_RULE_APPEND, FMT_NOCOUNTS);
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}
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#endif
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break;
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case NFT_COMPAT_SET_ADD:
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snprintf(tcr, sizeof(tcr), "set %s",
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nftnl_set_get_str(o->set, NFTNL_SET_NAME));
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break;
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case NFT_COMPAT_RULE_LIST:
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case NFT_COMPAT_RULE_CHECK:
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case NFT_COMPAT_CHAIN_RESTORE:
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case NFT_COMPAT_RULE_SAVE:
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case NFT_COMPAT_RULE_ZERO:
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case NFT_COMPAT_BRIDGE_USER_CHAIN_UPDATE:
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assert(0);
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break;
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}
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return snprintf(buf, len, "%s: %s", errmsg, tcr);
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}
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static struct obj_update *batch_add(struct nft_handle *h, enum obj_update_type type, void *ptr)
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{
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struct obj_update *obj;
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obj = xtables_calloc(1, sizeof(struct obj_update));
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obj->ptr = ptr;
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obj->error.lineno = h->error.lineno;
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obj->type = type;
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list_add_tail(&obj->head, &h->obj_list);
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h->obj_list_num++;
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return obj;
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}
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static struct obj_update *
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batch_table_add(struct nft_handle *h, enum obj_update_type type,
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struct nftnl_table *t)
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{
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return batch_add(h, type, t);
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}
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static struct obj_update *
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batch_set_add(struct nft_handle *h, enum obj_update_type type,
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struct nftnl_set *s)
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{
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return batch_add(h, type, s);
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}
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static struct obj_update *
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batch_chain_add(struct nft_handle *h, enum obj_update_type type,
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struct nftnl_chain *c)
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{
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return batch_add(h, type, c);
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}
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static struct obj_update *
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batch_rule_add(struct nft_handle *h, enum obj_update_type type,
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struct nftnl_rule *r)
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{
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return batch_add(h, type, r);
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}
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static void batch_obj_del(struct nft_handle *h, struct obj_update *o);
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static void batch_chain_flush(struct nft_handle *h,
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const char *table, const char *chain)
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{
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struct obj_update *obj, *tmp;
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list_for_each_entry_safe(obj, tmp, &h->obj_list, head) {
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struct nftnl_rule *r = obj->ptr;
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switch (obj->type) {
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case NFT_COMPAT_RULE_APPEND:
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case NFT_COMPAT_RULE_INSERT:
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case NFT_COMPAT_RULE_REPLACE:
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case NFT_COMPAT_RULE_DELETE:
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break;
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default:
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continue;
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}
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if (table &&
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strcmp(table, nftnl_rule_get_str(r, NFTNL_RULE_TABLE)))
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continue;
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if (chain &&
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strcmp(chain, nftnl_rule_get_str(r, NFTNL_RULE_CHAIN)))
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continue;
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batch_obj_del(h, obj);
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}
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}
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static const struct builtin_table xtables_ipv4[NFT_TABLE_MAX] = {
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[NFT_TABLE_RAW] = {
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.name = "raw",
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.type = NFT_TABLE_RAW,
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.chains = {
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{
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.name = "PREROUTING",
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.type = "filter",
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.prio = -300, /* NF_IP_PRI_RAW */
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.hook = NF_INET_PRE_ROUTING,
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},
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{
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.name = "OUTPUT",
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.type = "filter",
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.prio = -300, /* NF_IP_PRI_RAW */
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.hook = NF_INET_LOCAL_OUT,
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},
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},
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},
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[NFT_TABLE_MANGLE] = {
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.name = "mangle",
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.type = NFT_TABLE_MANGLE,
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.chains = {
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{
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.name = "PREROUTING",
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.type = "filter",
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.prio = -150, /* NF_IP_PRI_MANGLE */
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.hook = NF_INET_PRE_ROUTING,
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},
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{
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.name = "INPUT",
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.type = "filter",
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.prio = -150, /* NF_IP_PRI_MANGLE */
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.hook = NF_INET_LOCAL_IN,
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},
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{
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.name = "FORWARD",
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.type = "filter",
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.prio = -150, /* NF_IP_PRI_MANGLE */
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.hook = NF_INET_FORWARD,
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},
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{
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.name = "OUTPUT",
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.type = "route",
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.prio = -150, /* NF_IP_PRI_MANGLE */
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.hook = NF_INET_LOCAL_OUT,
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},
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{
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.name = "POSTROUTING",
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.type = "filter",
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.prio = -150, /* NF_IP_PRI_MANGLE */
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.hook = NF_INET_POST_ROUTING,
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},
|
|
},
|
|
},
|
|
[NFT_TABLE_FILTER] = {
|
|
.name = "filter",
|
|
.type = NFT_TABLE_FILTER,
|
|
.chains = {
|
|
{
|
|
.name = "INPUT",
|
|
.type = "filter",
|
|
.prio = 0, /* NF_IP_PRI_FILTER */
|
|
.hook = NF_INET_LOCAL_IN,
|
|
},
|
|
{
|
|
.name = "FORWARD",
|
|
.type = "filter",
|
|
.prio = 0, /* NF_IP_PRI_FILTER */
|
|
.hook = NF_INET_FORWARD,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "filter",
|
|
.prio = 0, /* NF_IP_PRI_FILTER */
|
|
.hook = NF_INET_LOCAL_OUT,
|
|
},
|
|
},
|
|
},
|
|
[NFT_TABLE_SECURITY] = {
|
|
.name = "security",
|
|
.type = NFT_TABLE_SECURITY,
|
|
.chains = {
|
|
{
|
|
.name = "INPUT",
|
|
.type = "filter",
|
|
.prio = 150, /* NF_IP_PRI_SECURITY */
|
|
.hook = NF_INET_LOCAL_IN,
|
|
},
|
|
{
|
|
.name = "FORWARD",
|
|
.type = "filter",
|
|
.prio = 150, /* NF_IP_PRI_SECURITY */
|
|
.hook = NF_INET_FORWARD,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "filter",
|
|
.prio = 150, /* NF_IP_PRI_SECURITY */
|
|
.hook = NF_INET_LOCAL_OUT,
|
|
},
|
|
},
|
|
},
|
|
[NFT_TABLE_NAT] = {
|
|
.name = "nat",
|
|
.type = NFT_TABLE_NAT,
|
|
.chains = {
|
|
{
|
|
.name = "PREROUTING",
|
|
.type = "nat",
|
|
.prio = -100, /* NF_IP_PRI_NAT_DST */
|
|
.hook = NF_INET_PRE_ROUTING,
|
|
},
|
|
{
|
|
.name = "INPUT",
|
|
.type = "nat",
|
|
.prio = 100, /* NF_IP_PRI_NAT_SRC */
|
|
.hook = NF_INET_LOCAL_IN,
|
|
},
|
|
{
|
|
.name = "POSTROUTING",
|
|
.type = "nat",
|
|
.prio = 100, /* NF_IP_PRI_NAT_SRC */
|
|
.hook = NF_INET_POST_ROUTING,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "nat",
|
|
.prio = -100, /* NF_IP_PRI_NAT_DST */
|
|
.hook = NF_INET_LOCAL_OUT,
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
#include <linux/netfilter_arp.h>
|
|
|
|
static const struct builtin_table xtables_arp[NFT_TABLE_MAX] = {
|
|
[NFT_TABLE_FILTER] = {
|
|
.name = "filter",
|
|
.type = NFT_TABLE_FILTER,
|
|
.chains = {
|
|
{
|
|
.name = "INPUT",
|
|
.type = "filter",
|
|
.prio = NF_IP_PRI_FILTER,
|
|
.hook = NF_ARP_IN,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "filter",
|
|
.prio = NF_IP_PRI_FILTER,
|
|
.hook = NF_ARP_OUT,
|
|
},
|
|
},
|
|
},
|
|
};
|
|
|
|
#include <linux/netfilter_bridge.h>
|
|
|
|
static const struct builtin_table xtables_bridge[NFT_TABLE_MAX] = {
|
|
[NFT_TABLE_FILTER] = {
|
|
.name = "filter",
|
|
.type = NFT_TABLE_FILTER,
|
|
.chains = {
|
|
{
|
|
.name = "INPUT",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_FILTER_BRIDGED,
|
|
.hook = NF_BR_LOCAL_IN,
|
|
},
|
|
{
|
|
.name = "FORWARD",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_FILTER_BRIDGED,
|
|
.hook = NF_BR_FORWARD,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_FILTER_BRIDGED,
|
|
.hook = NF_BR_LOCAL_OUT,
|
|
},
|
|
},
|
|
},
|
|
[NFT_TABLE_NAT] = {
|
|
.name = "nat",
|
|
.type = NFT_TABLE_NAT,
|
|
.chains = {
|
|
{
|
|
.name = "PREROUTING",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_NAT_DST_BRIDGED,
|
|
.hook = NF_BR_PRE_ROUTING,
|
|
},
|
|
{
|
|
.name = "OUTPUT",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_NAT_DST_OTHER,
|
|
.hook = NF_BR_LOCAL_OUT,
|
|
},
|
|
{
|
|
.name = "POSTROUTING",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_NAT_SRC,
|
|
.hook = NF_BR_POST_ROUTING,
|
|
},
|
|
},
|
|
},
|
|
[NFT_TABLE_BROUTE] = {
|
|
.name = "broute",
|
|
.type = NFT_TABLE_BROUTE,
|
|
.chains = {
|
|
{
|
|
.name = "BROUTING",
|
|
.type = "filter",
|
|
.prio = NF_BR_PRI_FIRST,
|
|
.hook = NF_BR_PRE_ROUTING,
|
|
},
|
|
},
|
|
},
|
|
|
|
};
|
|
|
|
static int nft_table_builtin_add(struct nft_handle *h,
|
|
const struct builtin_table *_t)
|
|
{
|
|
struct nftnl_table *t;
|
|
int ret;
|
|
|
|
if (h->cache->table[_t->type].exists)
|
|
return 0;
|
|
|
|
t = nftnl_table_alloc();
|
|
if (t == NULL)
|
|
return -1;
|
|
|
|
nftnl_table_set_u32(t, NFTNL_TABLE_FAMILY, h->family);
|
|
nftnl_table_set_str(t, NFTNL_TABLE_NAME, _t->name);
|
|
|
|
ret = batch_table_add(h, NFT_COMPAT_TABLE_ADD, t) ? 0 : - 1;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nftnl_chain *
|
|
nft_chain_builtin_alloc(int family, const char *tname,
|
|
const struct builtin_chain *chain, int policy)
|
|
{
|
|
struct nftnl_chain *c;
|
|
|
|
c = nftnl_chain_alloc();
|
|
if (c == NULL)
|
|
return NULL;
|
|
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_FAMILY, family);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_TABLE, tname);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_NAME, chain->name);
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_HOOKNUM, chain->hook);
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_PRIO, chain->prio);
|
|
if (policy >= 0)
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_POLICY, policy);
|
|
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_TYPE, chain->type);
|
|
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_PACKETS, 0);
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_BYTES, 0);
|
|
|
|
return c;
|
|
}
|
|
|
|
static void nft_chain_builtin_add(struct nft_handle *h,
|
|
const struct builtin_table *table,
|
|
const struct builtin_chain *chain,
|
|
bool fake)
|
|
{
|
|
struct nftnl_chain *c;
|
|
|
|
c = nft_chain_builtin_alloc(h->family, table->name, chain, NF_ACCEPT);
|
|
if (c == NULL)
|
|
return;
|
|
|
|
if (!fake)
|
|
batch_chain_add(h, NFT_COMPAT_CHAIN_ADD, c);
|
|
nft_cache_add_chain(h, table, c, fake);
|
|
}
|
|
|
|
/* find if built-in table already exists */
|
|
const struct builtin_table *
|
|
nft_table_builtin_find(struct nft_handle *h, const char *table)
|
|
{
|
|
int i;
|
|
bool found = false;
|
|
|
|
for (i = 0; i < NFT_TABLE_MAX; i++) {
|
|
if (h->tables[i].name == NULL)
|
|
continue;
|
|
|
|
if (strcmp(h->tables[i].name, table) != 0)
|
|
continue;
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
|
|
return found ? &h->tables[i] : NULL;
|
|
}
|
|
|
|
/* find if built-in chain already exists */
|
|
const struct builtin_chain *
|
|
nft_chain_builtin_find(const struct builtin_table *t, const char *chain)
|
|
{
|
|
int i;
|
|
bool found = false;
|
|
|
|
for (i=0; i<NF_IP_NUMHOOKS && t->chains[i].name != NULL; i++) {
|
|
if (strcmp(t->chains[i].name, chain) != 0)
|
|
continue;
|
|
|
|
found = true;
|
|
break;
|
|
}
|
|
return found ? &t->chains[i] : NULL;
|
|
}
|
|
|
|
static void nft_chain_builtin_init(struct nft_handle *h,
|
|
const struct builtin_table *table)
|
|
{
|
|
struct nft_chain *c;
|
|
int i;
|
|
|
|
/* Initialize built-in chains if they don't exist yet */
|
|
for (i=0; i < NF_INET_NUMHOOKS && table->chains[i].name != NULL; i++) {
|
|
c = nft_chain_find(h, table->name, table->chains[i].name);
|
|
if (!c) {
|
|
nft_chain_builtin_add(h, table,
|
|
&table->chains[i], false);
|
|
} else if (c->fake) {
|
|
batch_chain_add(h, NFT_COMPAT_CHAIN_ADD, c->nftnl);
|
|
c->fake = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
static const struct builtin_table *
|
|
nft_xt_builtin_table_init(struct nft_handle *h, const char *table)
|
|
{
|
|
const struct builtin_table *t;
|
|
|
|
if (!h->cache_init)
|
|
return NULL;
|
|
|
|
t = nft_table_builtin_find(h, table);
|
|
if (t == NULL)
|
|
return NULL;
|
|
|
|
if (nft_table_builtin_add(h, t) < 0)
|
|
return NULL;
|
|
|
|
return t;
|
|
}
|
|
|
|
static int nft_xt_builtin_init(struct nft_handle *h, const char *table,
|
|
const char *chain)
|
|
{
|
|
const struct builtin_table *t;
|
|
const struct builtin_chain *c;
|
|
struct nft_chain *nc;
|
|
|
|
if (!h->cache_init)
|
|
return 0;
|
|
|
|
t = nft_xt_builtin_table_init(h, table);
|
|
if (!t)
|
|
return -1;
|
|
|
|
if (h->cache_req.level < NFT_CL_CHAINS)
|
|
return 0;
|
|
|
|
if (!chain) {
|
|
nft_chain_builtin_init(h, t);
|
|
return 0;
|
|
}
|
|
|
|
c = nft_chain_builtin_find(t, chain);
|
|
if (!c)
|
|
return -1;
|
|
|
|
nc = h->cache->table[t->type].base_chains[c->hook];
|
|
if (!nc) {
|
|
nft_chain_builtin_add(h, t, c, false);
|
|
} else if (nc->fake) {
|
|
batch_chain_add(h, NFT_COMPAT_CHAIN_ADD, nc->nftnl);
|
|
nc->fake = false;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static bool nft_chain_builtin(struct nftnl_chain *c)
|
|
{
|
|
/* Check if this chain has hook number, in that case is built-in.
|
|
* Should we better export the flags to user-space via nf_tables?
|
|
*/
|
|
return nftnl_chain_get(c, NFTNL_CHAIN_HOOKNUM) != NULL;
|
|
}
|
|
|
|
static int __nft_xt_fake_builtin_chains(struct nft_handle *h,
|
|
const char *table, void *data)
|
|
{
|
|
const char *chain = data ? *(const char **)data : NULL;
|
|
const struct builtin_table *t;
|
|
struct nft_chain **bcp;
|
|
int i;
|
|
|
|
t = nft_table_builtin_find(h, table);
|
|
if (!t)
|
|
return -1;
|
|
|
|
bcp = h->cache->table[t->type].base_chains;
|
|
for (i = 0; i < NF_INET_NUMHOOKS && t->chains[i].name; i++) {
|
|
if (bcp[t->chains[i].hook])
|
|
continue;
|
|
|
|
if (chain && strcmp(chain, t->chains[i].name))
|
|
continue;
|
|
|
|
nft_chain_builtin_add(h, t, &t->chains[i], true);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int nft_xt_fake_builtin_chains(struct nft_handle *h,
|
|
const char *table, const char *chain)
|
|
{
|
|
if (table)
|
|
return __nft_xt_fake_builtin_chains(h, table, &chain);
|
|
|
|
return nft_for_each_table(h, __nft_xt_fake_builtin_chains, &chain);
|
|
}
|
|
|
|
int nft_restart(struct nft_handle *h)
|
|
{
|
|
mnl_socket_close(h->nl);
|
|
|
|
h->nl = mnl_socket_open(NETLINK_NETFILTER);
|
|
if (h->nl == NULL)
|
|
return -1;
|
|
|
|
if (mnl_socket_bind(h->nl, 0, MNL_SOCKET_AUTOPID) < 0)
|
|
return -1;
|
|
|
|
h->portid = mnl_socket_get_portid(h->nl);
|
|
h->nlsndbuffsiz = 0;
|
|
h->nlrcvbuffsiz = 0;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static const struct builtin_table *builtin_tables_lookup(int family)
|
|
{
|
|
switch (family) {
|
|
case AF_INET:
|
|
case AF_INET6:
|
|
return xtables_ipv4;
|
|
case NFPROTO_ARP:
|
|
return xtables_arp;
|
|
case NFPROTO_BRIDGE:
|
|
return xtables_bridge;
|
|
default:
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
int nft_init(struct nft_handle *h, int family)
|
|
{
|
|
memset(h, 0, sizeof(*h));
|
|
|
|
h->nl = mnl_socket_open(NETLINK_NETFILTER);
|
|
if (h->nl == NULL)
|
|
return -1;
|
|
|
|
if (mnl_socket_bind(h->nl, 0, MNL_SOCKET_AUTOPID) < 0) {
|
|
mnl_socket_close(h->nl);
|
|
return -1;
|
|
}
|
|
|
|
h->ops = nft_family_ops_lookup(family);
|
|
if (!h->ops)
|
|
xtables_error(PARAMETER_PROBLEM, "Unknown family");
|
|
|
|
h->portid = mnl_socket_get_portid(h->nl);
|
|
h->tables = builtin_tables_lookup(family);
|
|
h->cache = &h->__cache[0];
|
|
h->family = family;
|
|
|
|
INIT_LIST_HEAD(&h->obj_list);
|
|
INIT_LIST_HEAD(&h->err_list);
|
|
INIT_LIST_HEAD(&h->cmd_list);
|
|
INIT_LIST_HEAD(&h->cache_req.chain_list);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void nft_fini(struct nft_handle *h)
|
|
{
|
|
struct list_head *pos, *n;
|
|
|
|
list_for_each_safe(pos, n, &h->cmd_list)
|
|
nft_cmd_free(list_entry(pos, struct nft_cmd, head));
|
|
|
|
list_for_each_safe(pos, n, &h->obj_list)
|
|
batch_obj_del(h, list_entry(pos, struct obj_update, head));
|
|
|
|
list_for_each_safe(pos, n, &h->err_list)
|
|
mnl_err_list_free(list_entry(pos, struct mnl_err, head));
|
|
|
|
nft_release_cache(h);
|
|
mnl_socket_close(h->nl);
|
|
}
|
|
|
|
static void nft_chain_print_debug(struct nft_handle *h,
|
|
struct nftnl_chain *c, struct nlmsghdr *nlh)
|
|
{
|
|
if (h->verbose > 1) {
|
|
nftnl_chain_fprintf(stdout, c, 0, 0);
|
|
fprintf(stdout, "\n");
|
|
}
|
|
if (h->verbose > 2)
|
|
mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len,
|
|
sizeof(struct nfgenmsg));
|
|
}
|
|
|
|
static struct nftnl_chain *nft_chain_new(struct nft_handle *h,
|
|
const char *table, const char *chain,
|
|
int policy,
|
|
const struct xt_counters *counters)
|
|
{
|
|
static const struct xt_counters zero = {};
|
|
struct nftnl_chain *c;
|
|
const struct builtin_table *_t;
|
|
const struct builtin_chain *_c;
|
|
|
|
_t = nft_table_builtin_find(h, table);
|
|
if (!_t) {
|
|
errno = ENXIO;
|
|
return NULL;
|
|
}
|
|
|
|
/* if this built-in table does not exists, create it */
|
|
nft_xt_builtin_init(h, table, chain);
|
|
|
|
_c = nft_chain_builtin_find(_t, chain);
|
|
if (_c != NULL) {
|
|
/* This is a built-in chain */
|
|
c = nft_chain_builtin_alloc(h->family, _t->name, _c, policy);
|
|
if (c == NULL)
|
|
return NULL;
|
|
} else {
|
|
errno = ENOENT;
|
|
return NULL;
|
|
}
|
|
|
|
if (!counters)
|
|
counters = &zero;
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_BYTES, counters->bcnt);
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_PACKETS, counters->pcnt);
|
|
|
|
return c;
|
|
}
|
|
|
|
int nft_chain_set(struct nft_handle *h, const char *table,
|
|
const char *chain, const char *policy,
|
|
const struct xt_counters *counters)
|
|
{
|
|
struct nftnl_chain *c = NULL;
|
|
|
|
nft_fn = nft_chain_set;
|
|
|
|
if (strcmp(policy, "DROP") == 0)
|
|
c = nft_chain_new(h, table, chain, NF_DROP, counters);
|
|
else if (strcmp(policy, "ACCEPT") == 0)
|
|
c = nft_chain_new(h, table, chain, NF_ACCEPT, counters);
|
|
else if (strcmp(policy, "-") == 0)
|
|
c = nft_chain_new(h, table, chain, -1, counters);
|
|
else
|
|
errno = EINVAL;
|
|
|
|
if (c == NULL)
|
|
return 0;
|
|
|
|
if (!batch_chain_add(h, NFT_COMPAT_CHAIN_UPDATE, c))
|
|
return 0;
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return 1;
|
|
}
|
|
|
|
static int __add_match(struct nftnl_expr *e, struct xt_entry_match *m)
|
|
{
|
|
void *info;
|
|
|
|
nftnl_expr_set(e, NFTNL_EXPR_MT_NAME, m->u.user.name, strlen(m->u.user.name));
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_MT_REV, m->u.user.revision);
|
|
|
|
info = xtables_calloc(1, m->u.match_size);
|
|
memcpy(info, m->data, m->u.match_size - sizeof(*m));
|
|
nftnl_expr_set(e, NFTNL_EXPR_MT_INFO, info, m->u.match_size - sizeof(*m));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_nft_limit(struct nftnl_rule *r, struct xt_entry_match *m)
|
|
{
|
|
struct xt_rateinfo *rinfo = (void *)m->data;
|
|
static const uint32_t mult[] = {
|
|
XT_LIMIT_SCALE*24*60*60, /* day */
|
|
XT_LIMIT_SCALE*60*60, /* hour */
|
|
XT_LIMIT_SCALE*60, /* min */
|
|
XT_LIMIT_SCALE, /* sec */
|
|
};
|
|
struct nftnl_expr *expr;
|
|
int i;
|
|
|
|
expr = nftnl_expr_alloc("limit");
|
|
if (!expr)
|
|
return -ENOMEM;
|
|
|
|
for (i = 1; i < ARRAY_SIZE(mult); i++) {
|
|
if (rinfo->avg > mult[i] ||
|
|
mult[i] / rinfo->avg < mult[i] % rinfo->avg)
|
|
break;
|
|
}
|
|
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_LIMIT_TYPE, NFT_LIMIT_PKTS);
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_LIMIT_FLAGS, 0);
|
|
|
|
nftnl_expr_set_u64(expr, NFTNL_EXPR_LIMIT_RATE,
|
|
mult[i - 1] / rinfo->avg);
|
|
nftnl_expr_set_u64(expr, NFTNL_EXPR_LIMIT_UNIT,
|
|
mult[i - 1] / XT_LIMIT_SCALE);
|
|
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_LIMIT_BURST, rinfo->burst);
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
return 0;
|
|
}
|
|
|
|
static struct nftnl_set *add_anon_set(struct nft_handle *h, const char *table,
|
|
uint32_t flags, uint32_t key_type,
|
|
uint32_t key_len, uint32_t size)
|
|
{
|
|
static uint32_t set_id = 0;
|
|
struct nftnl_set *s;
|
|
struct nft_cmd *cmd;
|
|
|
|
s = nftnl_set_alloc();
|
|
if (!s)
|
|
return NULL;
|
|
|
|
nftnl_set_set_u32(s, NFTNL_SET_FAMILY, h->family);
|
|
nftnl_set_set_str(s, NFTNL_SET_TABLE, table);
|
|
nftnl_set_set_str(s, NFTNL_SET_NAME, "__set%d");
|
|
nftnl_set_set_u32(s, NFTNL_SET_ID, ++set_id);
|
|
nftnl_set_set_u32(s, NFTNL_SET_FLAGS,
|
|
NFT_SET_ANONYMOUS | NFT_SET_CONSTANT | flags);
|
|
nftnl_set_set_u32(s, NFTNL_SET_KEY_TYPE, key_type);
|
|
nftnl_set_set_u32(s, NFTNL_SET_KEY_LEN, key_len);
|
|
nftnl_set_set_u32(s, NFTNL_SET_DESC_SIZE, size);
|
|
|
|
cmd = nft_cmd_new(h, NFT_COMPAT_SET_ADD, table, NULL, NULL, -1, false);
|
|
if (!cmd) {
|
|
nftnl_set_free(s);
|
|
return NULL;
|
|
}
|
|
cmd->obj.set = s;
|
|
|
|
return s;
|
|
}
|
|
|
|
static struct nftnl_expr *
|
|
__gen_payload(uint32_t base, uint32_t offset, uint32_t len, uint8_t reg)
|
|
{
|
|
struct nftnl_expr *e = nftnl_expr_alloc("payload");
|
|
|
|
if (!e)
|
|
return NULL;
|
|
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_PAYLOAD_BASE, base);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_PAYLOAD_OFFSET, offset);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_PAYLOAD_LEN, len);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_PAYLOAD_DREG, reg);
|
|
|
|
return e;
|
|
}
|
|
|
|
static struct nftnl_expr *
|
|
gen_payload(struct nft_handle *h, uint32_t base, uint32_t offset, uint32_t len,
|
|
uint8_t *dreg)
|
|
{
|
|
struct nftnl_expr *e;
|
|
uint8_t reg;
|
|
|
|
reg = NFT_REG_1;
|
|
e = __gen_payload(base, offset, len, reg);
|
|
*dreg = reg;
|
|
|
|
return e;
|
|
}
|
|
|
|
static struct nftnl_expr *
|
|
gen_lookup(uint32_t sreg, const char *set_name, uint32_t set_id, uint32_t flags)
|
|
{
|
|
struct nftnl_expr *e = nftnl_expr_alloc("lookup");
|
|
|
|
if (!e)
|
|
return NULL;
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_SREG, sreg);
|
|
nftnl_expr_set_str(e, NFTNL_EXPR_LOOKUP_SET, set_name);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_SET_ID, set_id);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_LOOKUP_FLAGS, flags);
|
|
return e;
|
|
}
|
|
|
|
/* from nftables:include/datatype.h, TYPE_BITS */
|
|
#define CONCAT_TYPE_BITS 6
|
|
|
|
/* from nftables:include/datatype.h, enum datatypes */
|
|
#define NFT_DATATYPE_IPADDR 7
|
|
#define NFT_DATATYPE_ETHERADDR 9
|
|
|
|
static int __add_nft_among(struct nft_handle *h, const char *table,
|
|
struct nftnl_rule *r, struct nft_among_pair *pairs,
|
|
int cnt, bool dst, bool inv, bool ip)
|
|
{
|
|
uint32_t set_id, type = NFT_DATATYPE_ETHERADDR, len = ETH_ALEN;
|
|
/* { !dst, dst } */
|
|
static const int eth_addr_off[] = {
|
|
offsetof(struct ether_header, ether_shost),
|
|
offsetof(struct ether_header, ether_dhost)
|
|
};
|
|
static const int ip_addr_off[] = {
|
|
offsetof(struct iphdr, saddr),
|
|
offsetof(struct iphdr, daddr)
|
|
};
|
|
struct nftnl_expr *e;
|
|
struct nftnl_set *s;
|
|
uint32_t flags = 0;
|
|
uint8_t reg;
|
|
int idx = 0;
|
|
|
|
if (ip) {
|
|
type = type << CONCAT_TYPE_BITS | NFT_DATATYPE_IPADDR;
|
|
len += sizeof(struct in_addr) + NETLINK_ALIGN - 1;
|
|
len &= ~(NETLINK_ALIGN - 1);
|
|
flags = NFT_SET_INTERVAL | NFT_SET_CONCAT;
|
|
}
|
|
|
|
s = add_anon_set(h, table, flags, type, len, cnt);
|
|
if (!s)
|
|
return -ENOMEM;
|
|
set_id = nftnl_set_get_u32(s, NFTNL_SET_ID);
|
|
|
|
if (ip) {
|
|
uint8_t field_len[2] = { ETH_ALEN, sizeof(struct in_addr) };
|
|
|
|
nftnl_set_set_data(s, NFTNL_SET_DESC_CONCAT,
|
|
field_len, sizeof(field_len));
|
|
}
|
|
|
|
for (idx = 0; idx < cnt; idx++) {
|
|
struct nftnl_set_elem *elem = nftnl_set_elem_alloc();
|
|
|
|
if (!elem)
|
|
return -ENOMEM;
|
|
nftnl_set_elem_set(elem, NFTNL_SET_ELEM_KEY,
|
|
&pairs[idx], len);
|
|
if (ip) {
|
|
struct in_addr tmp = pairs[idx].in;
|
|
|
|
if (tmp.s_addr == INADDR_ANY)
|
|
pairs[idx].in.s_addr = INADDR_BROADCAST;
|
|
nftnl_set_elem_set(elem, NFTNL_SET_ELEM_KEY_END,
|
|
&pairs[idx], len);
|
|
pairs[idx].in = tmp;
|
|
}
|
|
nftnl_set_elem_add(s, elem);
|
|
}
|
|
|
|
e = gen_payload(h, NFT_PAYLOAD_LL_HEADER,
|
|
eth_addr_off[dst], ETH_ALEN, ®);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
nftnl_rule_add_expr(r, e);
|
|
|
|
if (ip) {
|
|
reg = nft_get_next_reg(reg, ETH_ALEN);
|
|
e = __gen_payload(NFT_PAYLOAD_NETWORK_HEADER, ip_addr_off[dst],
|
|
sizeof(struct in_addr), reg);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
nftnl_rule_add_expr(r, e);
|
|
}
|
|
|
|
reg = NFT_REG_1;
|
|
e = gen_lookup(reg, "__set%d", set_id, inv);
|
|
if (!e)
|
|
return -ENOMEM;
|
|
nftnl_rule_add_expr(r, e);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_nft_among(struct nft_handle *h,
|
|
struct nftnl_rule *r, struct xt_entry_match *m)
|
|
{
|
|
struct nft_among_data *data = (struct nft_among_data *)m->data;
|
|
const char *table = nftnl_rule_get(r, NFTNL_RULE_TABLE);
|
|
|
|
if ((data->src.cnt && data->src.ip) ||
|
|
(data->dst.cnt && data->dst.ip)) {
|
|
uint16_t eth_p_ip = htons(ETH_P_IP);
|
|
uint8_t reg;
|
|
|
|
add_meta(h, r, NFT_META_PROTOCOL, ®);
|
|
add_cmp_ptr(r, NFT_CMP_EQ, ð_p_ip, 2, reg);
|
|
}
|
|
|
|
if (data->src.cnt)
|
|
__add_nft_among(h, table, r, data->pairs, data->src.cnt,
|
|
false, data->src.inv, data->src.ip);
|
|
if (data->dst.cnt)
|
|
__add_nft_among(h, table, r, data->pairs + data->src.cnt,
|
|
data->dst.cnt, true, data->dst.inv,
|
|
data->dst.ip);
|
|
return 0;
|
|
}
|
|
|
|
static int expr_gen_range_cmp16(struct nftnl_rule *r,
|
|
uint16_t lo,
|
|
uint16_t hi,
|
|
bool invert, uint8_t reg)
|
|
{
|
|
struct nftnl_expr *e;
|
|
|
|
if (lo == hi) {
|
|
add_cmp_u16(r, htons(lo), invert ? NFT_CMP_NEQ : NFT_CMP_EQ, reg);
|
|
return 0;
|
|
}
|
|
|
|
if (lo == 0 && hi < 0xffff) {
|
|
add_cmp_u16(r, htons(hi) , invert ? NFT_CMP_GT : NFT_CMP_LTE, reg);
|
|
return 0;
|
|
}
|
|
|
|
e = nftnl_expr_alloc("range");
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_RANGE_SREG, reg);
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_RANGE_OP, invert ? NFT_RANGE_NEQ : NFT_RANGE_EQ);
|
|
|
|
lo = htons(lo);
|
|
nftnl_expr_set(e, NFTNL_EXPR_RANGE_FROM_DATA, &lo, sizeof(lo));
|
|
hi = htons(hi);
|
|
nftnl_expr_set(e, NFTNL_EXPR_RANGE_TO_DATA, &hi, sizeof(hi));
|
|
|
|
nftnl_rule_add_expr(r, e);
|
|
return 0;
|
|
}
|
|
|
|
static int add_nft_tcpudp(struct nft_handle *h,struct nftnl_rule *r,
|
|
uint16_t src[2], bool invert_src,
|
|
uint16_t dst[2], bool invert_dst)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
uint8_t op = NFT_CMP_EQ;
|
|
uint8_t reg;
|
|
int ret;
|
|
|
|
if (!invert_src &&
|
|
src[0] && src[0] == src[1] &&
|
|
dst[0] && dst[0] == dst[1] &&
|
|
invert_src == invert_dst) {
|
|
uint32_t combined = dst[0] | (src[0] << 16);
|
|
|
|
expr = gen_payload(h, NFT_PAYLOAD_TRANSPORT_HEADER, 0, 4, ®);
|
|
if (!expr)
|
|
return -ENOMEM;
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
add_cmp_u32(r, htonl(combined), op, reg);
|
|
return 0;
|
|
}
|
|
|
|
if (src[0] || src[1] < UINT16_MAX || invert_src) {
|
|
expr = gen_payload(h, NFT_PAYLOAD_TRANSPORT_HEADER, 0, 2, ®);
|
|
if (!expr)
|
|
return -ENOMEM;
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
ret = expr_gen_range_cmp16(r, src[0], src[1], invert_src, reg);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
if (dst[0] || dst[1] < UINT16_MAX || invert_dst) {
|
|
expr = gen_payload(h, NFT_PAYLOAD_TRANSPORT_HEADER, 2, 2, ®);
|
|
if (!expr)
|
|
return -ENOMEM;
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
ret = expr_gen_range_cmp16(r, dst[0], dst[1], invert_dst, reg);
|
|
if (ret)
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* without this, "iptables -A INPUT -m udp" is
|
|
* turned into "iptables -A INPUT", which isn't
|
|
* compatible with iptables-legacy behaviour.
|
|
*/
|
|
static bool udp_all_zero(const struct xt_udp *u)
|
|
{
|
|
static const struct xt_udp zero = {
|
|
.spts[1] = 0xffff,
|
|
.dpts[1] = 0xffff,
|
|
};
|
|
|
|
return memcmp(u, &zero, sizeof(*u)) == 0;
|
|
}
|
|
|
|
static int add_nft_udp(struct nft_handle *h, struct nftnl_rule *r,
|
|
struct xt_entry_match *m)
|
|
{
|
|
struct xt_udp *udp = (void *)m->data;
|
|
|
|
if (udp->invflags > XT_UDP_INV_MASK ||
|
|
udp_all_zero(udp)) {
|
|
struct nftnl_expr *expr = nftnl_expr_alloc("match");
|
|
int ret;
|
|
|
|
ret = __add_match(expr, m);
|
|
nftnl_rule_add_expr(r, expr);
|
|
return ret;
|
|
}
|
|
|
|
if (nftnl_rule_get_u32(r, NFTNL_RULE_COMPAT_PROTO) != IPPROTO_UDP)
|
|
xtables_error(PARAMETER_PROBLEM, "UDP match requires '-p udp'");
|
|
|
|
return add_nft_tcpudp(h, r, udp->spts, udp->invflags & XT_UDP_INV_SRCPT,
|
|
udp->dpts, udp->invflags & XT_UDP_INV_DSTPT);
|
|
}
|
|
|
|
static int add_nft_tcpflags(struct nft_handle *h, struct nftnl_rule *r,
|
|
uint8_t cmp, uint8_t mask,
|
|
bool invert)
|
|
{
|
|
struct nftnl_expr *e;
|
|
uint8_t reg;
|
|
|
|
e = gen_payload(h, NFT_PAYLOAD_TRANSPORT_HEADER, 13, 1, ®);
|
|
|
|
if (!e)
|
|
return -ENOMEM;
|
|
|
|
nftnl_rule_add_expr(r, e);
|
|
|
|
add_bitwise(h, r, &mask, 1, reg, ®);
|
|
add_cmp_u8(r, cmp, invert ? NFT_CMP_NEQ : NFT_CMP_EQ, reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static bool tcp_all_zero(const struct xt_tcp *t)
|
|
{
|
|
static const struct xt_tcp zero = {
|
|
.spts[1] = 0xffff,
|
|
.dpts[1] = 0xffff,
|
|
};
|
|
|
|
return memcmp(t, &zero, sizeof(*t)) == 0;
|
|
}
|
|
|
|
static int add_nft_tcp(struct nft_handle *h, struct nftnl_rule *r,
|
|
struct xt_entry_match *m)
|
|
{
|
|
static const uint8_t supported = XT_TCP_INV_SRCPT | XT_TCP_INV_DSTPT | XT_TCP_INV_FLAGS;
|
|
struct xt_tcp *tcp = (void *)m->data;
|
|
|
|
if (tcp->invflags & ~supported || tcp->option ||
|
|
tcp_all_zero(tcp)) {
|
|
struct nftnl_expr *expr = nftnl_expr_alloc("match");
|
|
int ret;
|
|
|
|
ret = __add_match(expr, m);
|
|
nftnl_rule_add_expr(r, expr);
|
|
return ret;
|
|
}
|
|
|
|
if (nftnl_rule_get_u32(r, NFTNL_RULE_COMPAT_PROTO) != IPPROTO_TCP)
|
|
xtables_error(PARAMETER_PROBLEM, "TCP match requires '-p tcp'");
|
|
|
|
if (tcp->flg_mask) {
|
|
int ret = add_nft_tcpflags(h, r, tcp->flg_cmp, tcp->flg_mask,
|
|
tcp->invflags & XT_TCP_INV_FLAGS);
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
return add_nft_tcpudp(h, r, tcp->spts, tcp->invflags & XT_TCP_INV_SRCPT,
|
|
tcp->dpts, tcp->invflags & XT_TCP_INV_DSTPT);
|
|
}
|
|
|
|
static int add_nft_mark(struct nft_handle *h, struct nftnl_rule *r,
|
|
struct xt_entry_match *m)
|
|
{
|
|
struct xt_mark_mtinfo1 *mark = (void *)m->data;
|
|
uint8_t reg;
|
|
int op;
|
|
|
|
add_meta(h, r, NFT_META_MARK, ®);
|
|
if (mark->mask != 0xffffffff)
|
|
add_bitwise(h, r, (uint8_t *)&mark->mask, sizeof(uint32_t), reg, ®);
|
|
|
|
if (mark->invert)
|
|
op = NFT_CMP_NEQ;
|
|
else
|
|
op = NFT_CMP_EQ;
|
|
|
|
add_cmp_u32(r, mark->mark, op, reg);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int add_match(struct nft_handle *h, struct nft_rule_ctx *ctx,
|
|
struct nftnl_rule *r, struct xt_entry_match *m)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
int ret;
|
|
|
|
switch (ctx->command) {
|
|
case NFT_COMPAT_RULE_APPEND:
|
|
case NFT_COMPAT_RULE_INSERT:
|
|
case NFT_COMPAT_RULE_REPLACE:
|
|
if (!strcmp(m->u.user.name, "limit"))
|
|
return add_nft_limit(r, m);
|
|
else if (!strcmp(m->u.user.name, "among"))
|
|
return add_nft_among(h, r, m);
|
|
else if (!strcmp(m->u.user.name, "udp"))
|
|
return add_nft_udp(h, r, m);
|
|
else if (!strcmp(m->u.user.name, "tcp"))
|
|
return add_nft_tcp(h, r, m);
|
|
else if (!strcmp(m->u.user.name, "mark"))
|
|
return add_nft_mark(h, r, m);
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
expr = nftnl_expr_alloc("match");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = __add_match(expr, m);
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int __add_target(struct nftnl_expr *e, struct xt_entry_target *t)
|
|
{
|
|
void *info;
|
|
|
|
nftnl_expr_set(e, NFTNL_EXPR_TG_NAME, t->u.user.name,
|
|
strlen(t->u.user.name));
|
|
nftnl_expr_set_u32(e, NFTNL_EXPR_TG_REV, t->u.user.revision);
|
|
|
|
info = xtables_calloc(1, t->u.target_size);
|
|
memcpy(info, t->data, t->u.target_size - sizeof(*t));
|
|
nftnl_expr_set(e, NFTNL_EXPR_TG_INFO, info, t->u.target_size - sizeof(*t));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int add_meta_nftrace(struct nftnl_rule *r)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
|
|
expr = nftnl_expr_alloc("immediate");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_IMM_DREG, NFT_REG32_01);
|
|
nftnl_expr_set_u8(expr, NFTNL_EXPR_IMM_DATA, 1);
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
expr = nftnl_expr_alloc("meta");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_META_KEY, NFT_META_NFTRACE);
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_META_SREG, NFT_REG32_01);
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
return 0;
|
|
}
|
|
|
|
int add_target(struct nftnl_rule *r, struct xt_entry_target *t)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
int ret;
|
|
|
|
if (strcmp(t->u.user.name, "TRACE") == 0)
|
|
return add_meta_nftrace(r);
|
|
|
|
expr = nftnl_expr_alloc("target");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
ret = __add_target(expr, t);
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int add_jumpto(struct nftnl_rule *r, const char *name, int verdict)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
|
|
expr = nftnl_expr_alloc("immediate");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_IMM_DREG, NFT_REG_VERDICT);
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_IMM_VERDICT, verdict);
|
|
nftnl_expr_set_str(expr, NFTNL_EXPR_IMM_CHAIN, (char *)name);
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int add_verdict(struct nftnl_rule *r, int verdict)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
|
|
expr = nftnl_expr_alloc("immediate");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_IMM_DREG, NFT_REG_VERDICT);
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_IMM_VERDICT, verdict);
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int add_action(struct nftnl_rule *r, struct iptables_command_state *cs,
|
|
bool goto_set)
|
|
{
|
|
int ret = 0;
|
|
|
|
/* If no target at all, add nothing (default to continue) */
|
|
if (cs->target != NULL) {
|
|
/* Standard target? */
|
|
if (strcmp(cs->jumpto, XTC_LABEL_ACCEPT) == 0)
|
|
ret = add_verdict(r, NF_ACCEPT);
|
|
else if (strcmp(cs->jumpto, XTC_LABEL_DROP) == 0)
|
|
ret = add_verdict(r, NF_DROP);
|
|
else if (strcmp(cs->jumpto, XTC_LABEL_RETURN) == 0)
|
|
ret = add_verdict(r, NFT_RETURN);
|
|
else if (strcmp(cs->jumpto, "NFLOG") == 0)
|
|
ret = add_log(r, cs);
|
|
else
|
|
ret = add_target(r, cs->target->t);
|
|
} else if (strlen(cs->jumpto) > 0) {
|
|
/* Not standard, then it's a go / jump to chain */
|
|
if (goto_set)
|
|
ret = add_jumpto(r, cs->jumpto, NFT_GOTO);
|
|
else
|
|
ret = add_jumpto(r, cs->jumpto, NFT_JUMP);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
int add_log(struct nftnl_rule *r, struct iptables_command_state *cs)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
struct xt_nflog_info *info = (struct xt_nflog_info *)cs->target->t->data;
|
|
|
|
expr = nftnl_expr_alloc("log");
|
|
if (!expr)
|
|
return -ENOMEM;
|
|
|
|
if (info->prefix[0] != '\0')
|
|
nftnl_expr_set_str(expr, NFTNL_EXPR_LOG_PREFIX,
|
|
cs->target->udata);
|
|
|
|
nftnl_expr_set_u16(expr, NFTNL_EXPR_LOG_GROUP, info->group);
|
|
if (info->flags & XT_NFLOG_F_COPY_LEN)
|
|
nftnl_expr_set_u32(expr, NFTNL_EXPR_LOG_SNAPLEN,
|
|
info->len);
|
|
if (info->threshold)
|
|
nftnl_expr_set_u16(expr, NFTNL_EXPR_LOG_QTHRESHOLD,
|
|
info->threshold);
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
return 0;
|
|
}
|
|
|
|
static void nft_rule_print_debug(struct nft_handle *h,
|
|
struct nftnl_rule *r, struct nlmsghdr *nlh)
|
|
{
|
|
if (h->verbose > 1) {
|
|
nftnl_rule_fprintf(stdout, r, 0, 0);
|
|
fprintf(stdout, "\n");
|
|
}
|
|
if (h->verbose > 2)
|
|
mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len,
|
|
sizeof(struct nfgenmsg));
|
|
}
|
|
|
|
int add_counters(struct nftnl_rule *r, uint64_t packets, uint64_t bytes)
|
|
{
|
|
struct nftnl_expr *expr;
|
|
|
|
expr = nftnl_expr_alloc("counter");
|
|
if (expr == NULL)
|
|
return -ENOMEM;
|
|
|
|
nftnl_expr_set_u64(expr, NFTNL_EXPR_CTR_PACKETS, packets);
|
|
nftnl_expr_set_u64(expr, NFTNL_EXPR_CTR_BYTES, bytes);
|
|
|
|
nftnl_rule_add_expr(r, expr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
enum udata_type {
|
|
UDATA_TYPE_COMMENT,
|
|
UDATA_TYPE_EBTABLES_POLICY,
|
|
__UDATA_TYPE_MAX,
|
|
};
|
|
#define UDATA_TYPE_MAX (__UDATA_TYPE_MAX - 1)
|
|
|
|
static int parse_udata_cb(const struct nftnl_udata *attr, void *data)
|
|
{
|
|
unsigned char *value = nftnl_udata_get(attr);
|
|
uint8_t type = nftnl_udata_type(attr);
|
|
uint8_t len = nftnl_udata_len(attr);
|
|
const struct nftnl_udata **tb = data;
|
|
|
|
switch (type) {
|
|
case UDATA_TYPE_COMMENT:
|
|
if (value[len - 1] != '\0')
|
|
return -1;
|
|
break;
|
|
case UDATA_TYPE_EBTABLES_POLICY:
|
|
break;
|
|
default:
|
|
return 0;
|
|
}
|
|
tb[type] = attr;
|
|
return 0;
|
|
}
|
|
|
|
char *get_comment(const void *data, uint32_t data_len)
|
|
{
|
|
const struct nftnl_udata *tb[UDATA_TYPE_MAX + 1] = {};
|
|
|
|
if (nftnl_udata_parse(data, data_len, parse_udata_cb, tb) < 0)
|
|
return NULL;
|
|
|
|
if (!tb[UDATA_TYPE_COMMENT])
|
|
return NULL;
|
|
|
|
return nftnl_udata_get(tb[UDATA_TYPE_COMMENT]);
|
|
}
|
|
|
|
void add_compat(struct nftnl_rule *r, uint32_t proto, bool inv)
|
|
{
|
|
nftnl_rule_set_u32(r, NFTNL_RULE_COMPAT_PROTO, proto);
|
|
nftnl_rule_set_u32(r, NFTNL_RULE_COMPAT_FLAGS,
|
|
inv ? NFT_RULE_COMPAT_F_INV : 0);
|
|
}
|
|
|
|
struct nftnl_rule *
|
|
nft_rule_new(struct nft_handle *h, struct nft_rule_ctx *ctx,
|
|
const char *chain, const char *table,
|
|
struct iptables_command_state *cs)
|
|
{
|
|
struct nftnl_rule *r;
|
|
|
|
r = nftnl_rule_alloc();
|
|
if (r == NULL)
|
|
return NULL;
|
|
|
|
nftnl_rule_set_u32(r, NFTNL_RULE_FAMILY, h->family);
|
|
nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
|
|
nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
|
|
|
|
if (h->ops->add(h, ctx, r, cs) < 0)
|
|
goto err;
|
|
|
|
return r;
|
|
err:
|
|
nftnl_rule_free(r);
|
|
return NULL;
|
|
}
|
|
|
|
int
|
|
nft_rule_append(struct nft_handle *h, const char *chain, const char *table,
|
|
struct nftnl_rule *r, struct nftnl_rule *ref, bool verbose)
|
|
{
|
|
struct nft_chain *c;
|
|
int type;
|
|
|
|
nft_xt_builtin_init(h, table, chain);
|
|
|
|
nft_fn = nft_rule_append;
|
|
|
|
if (ref) {
|
|
nftnl_rule_set_u64(r, NFTNL_RULE_HANDLE,
|
|
nftnl_rule_get_u64(ref, NFTNL_RULE_HANDLE));
|
|
type = NFT_COMPAT_RULE_REPLACE;
|
|
} else
|
|
type = NFT_COMPAT_RULE_APPEND;
|
|
|
|
if (batch_rule_add(h, type, r) == NULL)
|
|
return 0;
|
|
|
|
if (verbose)
|
|
h->ops->print_rule(h, r, 0, FMT_PRINT_RULE);
|
|
|
|
if (ref) {
|
|
nftnl_chain_rule_insert_at(r, ref);
|
|
nftnl_chain_rule_del(ref);
|
|
nftnl_rule_free(ref);
|
|
} else {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
nftnl_chain_rule_add_tail(r, c->nftnl);
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
bool
|
|
nft_rule_print_save(struct nft_handle *h, const struct nftnl_rule *r,
|
|
enum nft_rule_print type, unsigned int format)
|
|
{
|
|
const char *chain = nftnl_rule_get_str(r, NFTNL_RULE_CHAIN);
|
|
struct iptables_command_state cs = {};
|
|
struct nft_family_ops *ops = h->ops;
|
|
bool ret;
|
|
|
|
if (ops->init_cs)
|
|
ops->init_cs(&cs);
|
|
ret = ops->rule_to_cs(h, r, &cs);
|
|
|
|
if (!(format & (FMT_NOCOUNTS | FMT_C_COUNTS)))
|
|
printf("[%llu:%llu] ", (unsigned long long)cs.counters.pcnt,
|
|
(unsigned long long)cs.counters.bcnt);
|
|
|
|
/* print chain name */
|
|
switch(type) {
|
|
case NFT_RULE_APPEND:
|
|
printf("-A %s", chain);
|
|
break;
|
|
case NFT_RULE_DEL:
|
|
printf("-D %s", chain);
|
|
break;
|
|
}
|
|
|
|
if (ops->save_rule)
|
|
ops->save_rule(&cs, format);
|
|
|
|
if (ops->clear_cs)
|
|
ops->clear_cs(&cs);
|
|
|
|
return ret;
|
|
}
|
|
|
|
bool nft_rule_is_policy_rule(struct nftnl_rule *r)
|
|
{
|
|
const struct nftnl_udata *tb[UDATA_TYPE_MAX + 1] = {};
|
|
const void *data;
|
|
uint32_t len;
|
|
|
|
if (!nftnl_rule_is_set(r, NFTNL_RULE_USERDATA))
|
|
return false;
|
|
|
|
data = nftnl_rule_get_data(r, NFTNL_RULE_USERDATA, &len);
|
|
if (nftnl_udata_parse(data, len, parse_udata_cb, tb) < 0)
|
|
return NULL;
|
|
|
|
if (!tb[UDATA_TYPE_EBTABLES_POLICY] ||
|
|
nftnl_udata_get_u32(tb[UDATA_TYPE_EBTABLES_POLICY]) != 1)
|
|
return false;
|
|
|
|
return true;
|
|
}
|
|
|
|
static struct nftnl_rule *nft_chain_last_rule(struct nftnl_chain *c)
|
|
{
|
|
struct nftnl_rule *r = NULL, *last;
|
|
struct nftnl_rule_iter *iter;
|
|
|
|
iter = nftnl_rule_iter_create(c);
|
|
if (!iter)
|
|
return NULL;
|
|
|
|
do {
|
|
last = r;
|
|
r = nftnl_rule_iter_next(iter);
|
|
} while (r);
|
|
nftnl_rule_iter_destroy(iter);
|
|
|
|
return last;
|
|
}
|
|
|
|
void nft_bridge_chain_postprocess(struct nft_handle *h,
|
|
struct nftnl_chain *c)
|
|
{
|
|
struct nftnl_rule *last = nft_chain_last_rule(c);
|
|
struct nftnl_expr_iter *iter;
|
|
struct nftnl_expr *expr;
|
|
int verdict;
|
|
|
|
if (!last || !nft_rule_is_policy_rule(last))
|
|
return;
|
|
|
|
iter = nftnl_expr_iter_create(last);
|
|
if (!iter)
|
|
return;
|
|
|
|
expr = nftnl_expr_iter_next(iter);
|
|
if (!expr ||
|
|
strcmp("counter", nftnl_expr_get_str(expr, NFTNL_EXPR_NAME)))
|
|
goto out_iter;
|
|
|
|
expr = nftnl_expr_iter_next(iter);
|
|
if (!expr ||
|
|
strcmp("immediate", nftnl_expr_get_str(expr, NFTNL_EXPR_NAME)) ||
|
|
!nftnl_expr_is_set(expr, NFTNL_EXPR_IMM_VERDICT))
|
|
goto out_iter;
|
|
|
|
verdict = nftnl_expr_get_u32(expr, NFTNL_EXPR_IMM_VERDICT);
|
|
switch (verdict) {
|
|
case NF_ACCEPT:
|
|
case NF_DROP:
|
|
break;
|
|
default:
|
|
goto out_iter;
|
|
}
|
|
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_POLICY, verdict);
|
|
if (batch_rule_add(h, NFT_COMPAT_RULE_DELETE, last) == NULL)
|
|
fprintf(stderr, "Failed to delete old policy rule\n");
|
|
nftnl_chain_rule_del(last);
|
|
out_iter:
|
|
nftnl_expr_iter_destroy(iter);
|
|
}
|
|
static const char *policy_name[NF_ACCEPT+1] = {
|
|
[NF_DROP] = "DROP",
|
|
[NF_ACCEPT] = "ACCEPT",
|
|
};
|
|
|
|
int nft_chain_save(struct nft_chain *nc, void *data)
|
|
{
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
struct nft_handle *h = data;
|
|
const char *policy = NULL;
|
|
|
|
if (nftnl_chain_is_set(c, NFTNL_CHAIN_POLICY)) {
|
|
policy = policy_name[nftnl_chain_get_u32(c, NFTNL_CHAIN_POLICY)];
|
|
} else if (nft_chain_builtin(c)) {
|
|
policy = "ACCEPT";
|
|
} else if (h->family == NFPROTO_BRIDGE) {
|
|
policy = "RETURN";
|
|
}
|
|
|
|
if (h->ops->save_chain)
|
|
h->ops->save_chain(c, policy);
|
|
|
|
return 0;
|
|
}
|
|
|
|
struct nft_rule_save_data {
|
|
struct nft_handle *h;
|
|
unsigned int format;
|
|
unsigned int errors;
|
|
};
|
|
|
|
static int nft_rule_save_cb(struct nft_chain *c, void *data)
|
|
{
|
|
struct nft_rule_save_data *d = data;
|
|
struct nftnl_rule_iter *iter;
|
|
struct nftnl_rule *r;
|
|
|
|
iter = nftnl_rule_iter_create(c->nftnl);
|
|
if (iter == NULL)
|
|
return 1;
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
while (r != NULL) {
|
|
bool ret = nft_rule_print_save(d->h, r, NFT_RULE_APPEND, d->format);
|
|
|
|
if (!ret)
|
|
d->errors++;
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
}
|
|
|
|
nftnl_rule_iter_destroy(iter);
|
|
return 0;
|
|
}
|
|
|
|
int nft_rule_save(struct nft_handle *h, const char *table, unsigned int format)
|
|
{
|
|
struct nft_rule_save_data d = {
|
|
.h = h,
|
|
.format = format,
|
|
};
|
|
int ret;
|
|
|
|
ret = nft_chain_foreach(h, table, nft_rule_save_cb, &d);
|
|
|
|
if (ret == 0 && d.errors)
|
|
xtables_error(VERSION_PROBLEM, "Cannot decode all rules provided by kernel");
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
struct nftnl_set *nft_set_batch_lookup_byid(struct nft_handle *h,
|
|
uint32_t set_id)
|
|
{
|
|
struct obj_update *n;
|
|
|
|
list_for_each_entry(n, &h->obj_list, head) {
|
|
if (n->type == NFT_COMPAT_SET_ADD &&
|
|
nftnl_set_get_u32(n->set, NFTNL_SET_ID) == set_id)
|
|
return n->set;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
__nft_rule_flush(struct nft_handle *h, const char *table,
|
|
const char *chain, bool verbose, bool skip)
|
|
{
|
|
struct obj_update *obj;
|
|
struct nftnl_rule *r;
|
|
|
|
if (verbose && chain)
|
|
fprintf(stdout, "Flushing chain `%s'\n", chain);
|
|
|
|
r = nftnl_rule_alloc();
|
|
if (r == NULL)
|
|
return;
|
|
|
|
nftnl_rule_set_str(r, NFTNL_RULE_TABLE, table);
|
|
if (chain)
|
|
nftnl_rule_set_str(r, NFTNL_RULE_CHAIN, chain);
|
|
|
|
obj = batch_rule_add(h, NFT_COMPAT_RULE_FLUSH, r);
|
|
if (!obj) {
|
|
nftnl_rule_free(r);
|
|
return;
|
|
}
|
|
|
|
obj->skip = skip;
|
|
}
|
|
|
|
struct nft_rule_flush_data {
|
|
struct nft_handle *h;
|
|
const char *table;
|
|
bool verbose;
|
|
};
|
|
|
|
static int nft_rule_flush_cb(struct nft_chain *c, void *data)
|
|
{
|
|
const char *chain = nftnl_chain_get_str(c->nftnl, NFTNL_CHAIN_NAME);
|
|
struct nft_rule_flush_data *d = data;
|
|
|
|
batch_chain_flush(d->h, d->table, chain);
|
|
__nft_rule_flush(d->h, d->table, chain, d->verbose, false);
|
|
flush_rule_cache(d->h, d->table, c);
|
|
return 0;
|
|
}
|
|
|
|
int nft_rule_flush(struct nft_handle *h, const char *chain, const char *table,
|
|
bool verbose)
|
|
{
|
|
struct nft_rule_flush_data d = {
|
|
.h = h,
|
|
.table = table,
|
|
.verbose = verbose,
|
|
};
|
|
struct nft_chain *c = NULL;
|
|
int ret = 0;
|
|
|
|
nft_fn = nft_rule_flush;
|
|
|
|
if (chain || verbose)
|
|
nft_xt_builtin_init(h, table, chain);
|
|
else if (!nft_table_find(h, table))
|
|
return 1;
|
|
|
|
if (chain) {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
if (chain || !verbose) {
|
|
batch_chain_flush(h, table, chain);
|
|
__nft_rule_flush(h, table, chain, verbose, false);
|
|
flush_rule_cache(h, table, c);
|
|
return 1;
|
|
}
|
|
|
|
nft_cache_sort_chains(h, table);
|
|
|
|
ret = nft_chain_foreach(h, table, nft_rule_flush_cb, &d);
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
int nft_chain_user_add(struct nft_handle *h, const char *chain, const char *table)
|
|
{
|
|
const struct builtin_table *t;
|
|
struct nftnl_chain *c;
|
|
|
|
nft_fn = nft_chain_user_add;
|
|
|
|
t = nft_xt_builtin_table_init(h, table);
|
|
|
|
if (nft_chain_exists(h, table, chain)) {
|
|
errno = EEXIST;
|
|
return 0;
|
|
}
|
|
|
|
c = nftnl_chain_alloc();
|
|
if (c == NULL)
|
|
return 0;
|
|
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_FAMILY, h->family);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_TABLE, table);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_NAME, chain);
|
|
if (h->family == NFPROTO_BRIDGE)
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_POLICY, NF_ACCEPT);
|
|
|
|
if (!batch_chain_add(h, NFT_COMPAT_CHAIN_USER_ADD, c))
|
|
return 0;
|
|
|
|
nft_cache_add_chain(h, t, c, false);
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return 1;
|
|
}
|
|
|
|
int nft_chain_restore(struct nft_handle *h, const char *chain, const char *table)
|
|
{
|
|
const struct builtin_table *t;
|
|
struct obj_update *obj;
|
|
struct nftnl_chain *c;
|
|
struct nft_chain *nc;
|
|
bool created = false;
|
|
|
|
t = nft_xt_builtin_table_init(h, table);
|
|
|
|
nc = nft_chain_find(h, table, chain);
|
|
if (!nc) {
|
|
c = nftnl_chain_alloc();
|
|
if (!c)
|
|
return 0;
|
|
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_FAMILY, h->family);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_TABLE, table);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_NAME, chain);
|
|
created = true;
|
|
|
|
nft_cache_add_chain(h, t, c, false);
|
|
} else {
|
|
c = nc->nftnl;
|
|
|
|
/* If the chain should vanish meanwhile, kernel genid changes
|
|
* and the transaction is refreshed enabling the chain add
|
|
* object. With the handle still set, kernel interprets it as a
|
|
* chain replace job and errors since it is not found anymore.
|
|
*/
|
|
nftnl_chain_unset(c, NFTNL_CHAIN_HANDLE);
|
|
}
|
|
|
|
__nft_rule_flush(h, table, chain, false, created);
|
|
|
|
obj = batch_chain_add(h, NFT_COMPAT_CHAIN_USER_ADD, c);
|
|
if (!obj)
|
|
return 0;
|
|
|
|
obj->skip = !created;
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return 1;
|
|
}
|
|
|
|
/* From linux/netlink.h */
|
|
#ifndef NLM_F_NONREC
|
|
#define NLM_F_NONREC 0x100 /* Do not delete recursively */
|
|
#endif
|
|
|
|
struct chain_del_data {
|
|
struct nft_handle *handle;
|
|
const char *chain;
|
|
bool verbose;
|
|
};
|
|
|
|
static bool nft_may_delete_chain(struct nftnl_chain *c)
|
|
{
|
|
if (nftnl_chain_is_set(c, NFTNL_CHAIN_POLICY) &&
|
|
nftnl_chain_get_u32(c, NFTNL_CHAIN_POLICY) != NF_ACCEPT)
|
|
return false;
|
|
|
|
return nftnl_rule_lookup_byindex(c, 0) == NULL;
|
|
}
|
|
|
|
static int __nft_chain_del(struct nft_chain *nc, void *data)
|
|
{
|
|
struct chain_del_data *d = data;
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
struct nft_handle *h = d->handle;
|
|
bool builtin = nft_chain_builtin(c);
|
|
struct obj_update *obj;
|
|
int ret = 0;
|
|
|
|
if (d->verbose && !builtin)
|
|
fprintf(stdout, "Deleting chain `%s'\n",
|
|
nftnl_chain_get_str(c, NFTNL_CHAIN_NAME));
|
|
|
|
|
|
/* XXX This triggers a fast lookup from the kernel. */
|
|
nftnl_chain_unset(c, NFTNL_CHAIN_HANDLE);
|
|
obj = batch_chain_add(h, NFT_COMPAT_CHAIN_DEL, c);
|
|
if (!obj)
|
|
return -1;
|
|
|
|
if (builtin) {
|
|
obj->skip = !nft_may_delete_chain(c);
|
|
if (obj->skip && d->chain) {
|
|
/* complain if explicitly requested */
|
|
errno = EBUSY;
|
|
ret = -1;
|
|
}
|
|
*nc->base_slot = NULL;
|
|
}
|
|
|
|
/* nftnl_chain is freed when deleting the batch object */
|
|
nc->nftnl = NULL;
|
|
|
|
nft_chain_list_del(nc);
|
|
nft_chain_free(nc);
|
|
return ret;
|
|
}
|
|
|
|
int nft_chain_del(struct nft_handle *h, const char *chain,
|
|
const char *table, bool verbose)
|
|
{
|
|
struct chain_del_data d = {
|
|
.handle = h,
|
|
.chain = chain,
|
|
.verbose = verbose,
|
|
};
|
|
struct nft_chain *c;
|
|
int ret = 0;
|
|
|
|
nft_fn = nft_chain_del;
|
|
|
|
if (chain) {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
ret = __nft_chain_del(c, &d);
|
|
goto out;
|
|
}
|
|
|
|
if (verbose)
|
|
nft_cache_sort_chains(h, table);
|
|
|
|
ret = nft_chain_foreach(h, table, __nft_chain_del, &d);
|
|
out:
|
|
/* the core expects 1 for success and 0 for error */
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
bool nft_chain_exists(struct nft_handle *h,
|
|
const char *table, const char *chain)
|
|
{
|
|
const struct builtin_table *t = nft_table_builtin_find(h, table);
|
|
|
|
/* xtables does not support custom tables */
|
|
if (!t)
|
|
return false;
|
|
|
|
if (nft_chain_builtin_find(t, chain))
|
|
return true;
|
|
|
|
return !!nft_chain_find(h, table, chain);
|
|
}
|
|
|
|
int nft_chain_user_rename(struct nft_handle *h,const char *chain,
|
|
const char *table, const char *newname)
|
|
{
|
|
struct nftnl_chain *c;
|
|
struct nft_chain *nc;
|
|
uint64_t handle;
|
|
|
|
nft_fn = nft_chain_user_rename;
|
|
|
|
if (nft_chain_exists(h, table, newname)) {
|
|
errno = EEXIST;
|
|
return 0;
|
|
}
|
|
|
|
/* Find the old chain to be renamed */
|
|
nc = nft_chain_find(h, table, chain);
|
|
if (nc == NULL) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
handle = nftnl_chain_get_u64(nc->nftnl, NFTNL_CHAIN_HANDLE);
|
|
|
|
/* Now prepare the new name for the chain */
|
|
c = nftnl_chain_alloc();
|
|
if (c == NULL)
|
|
return 0;
|
|
|
|
nftnl_chain_set_u32(c, NFTNL_CHAIN_FAMILY, h->family);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_TABLE, table);
|
|
nftnl_chain_set_str(c, NFTNL_CHAIN_NAME, newname);
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_HANDLE, handle);
|
|
|
|
if (!batch_chain_add(h, NFT_COMPAT_CHAIN_RENAME, c))
|
|
return 0;
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return 1;
|
|
}
|
|
|
|
bool nft_table_find(struct nft_handle *h, const char *tablename)
|
|
{
|
|
const struct builtin_table *t;
|
|
|
|
t = nft_table_builtin_find(h, tablename);
|
|
return t ? h->cache->table[t->type].exists : false;
|
|
}
|
|
|
|
int nft_for_each_table(struct nft_handle *h,
|
|
int (*func)(struct nft_handle *h, const char *tablename, void *data),
|
|
void *data)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < NFT_TABLE_MAX; i++) {
|
|
if (h->tables[i].name == NULL)
|
|
continue;
|
|
|
|
if (!h->cache->table[h->tables[i].type].exists)
|
|
continue;
|
|
|
|
func(h, h->tables[i].name, data);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int __nft_table_flush(struct nft_handle *h, const char *table, bool exists)
|
|
{
|
|
const struct builtin_table *_t;
|
|
struct obj_update *obj;
|
|
struct nftnl_table *t;
|
|
|
|
t = nftnl_table_alloc();
|
|
if (t == NULL)
|
|
return -1;
|
|
|
|
nftnl_table_set_u32(t, NFTNL_TABLE_FAMILY, h->family);
|
|
nftnl_table_set_str(t, NFTNL_TABLE_NAME, table);
|
|
|
|
obj = batch_table_add(h, NFT_COMPAT_TABLE_FLUSH, t);
|
|
if (!obj) {
|
|
nftnl_table_free(t);
|
|
return -1;
|
|
}
|
|
|
|
if (!exists)
|
|
obj->skip = 1;
|
|
|
|
_t = nft_table_builtin_find(h, table);
|
|
assert(_t);
|
|
h->cache->table[_t->type].exists = false;
|
|
|
|
flush_chain_cache(h, table);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int nft_table_flush(struct nft_handle *h, const char *table)
|
|
{
|
|
const struct builtin_table *t;
|
|
int ret = 0;
|
|
|
|
nft_fn = nft_table_flush;
|
|
|
|
t = nft_table_builtin_find(h, table);
|
|
if (!t)
|
|
return 0;
|
|
|
|
ret = __nft_table_flush(h, table, h->cache->table[t->type].exists);
|
|
|
|
/* the core expects 1 for success and 0 for error */
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
static int __nft_rule_del(struct nft_handle *h, struct nftnl_rule *r)
|
|
{
|
|
struct obj_update *obj;
|
|
|
|
nftnl_rule_list_del(r);
|
|
|
|
if (!nftnl_rule_get_u64(r, NFTNL_RULE_HANDLE) &&
|
|
!nftnl_rule_get_u32(r, NFTNL_RULE_ID))
|
|
nftnl_rule_set_u32(r, NFTNL_RULE_ID, ++h->rule_id);
|
|
|
|
obj = batch_rule_add(h, NFT_COMPAT_RULE_DELETE, r);
|
|
if (!obj) {
|
|
nftnl_rule_free(r);
|
|
return -1;
|
|
}
|
|
return 1;
|
|
}
|
|
|
|
static bool nft_rule_cmp(struct nft_handle *h, struct nftnl_rule *r,
|
|
struct iptables_command_state *cs)
|
|
{
|
|
struct iptables_command_state this = {};
|
|
bool ret = false, ret_this;
|
|
|
|
if (h->ops->init_cs)
|
|
h->ops->init_cs(&this);
|
|
|
|
ret_this = h->ops->rule_to_cs(h, r, &this);
|
|
|
|
DEBUGP("with ... ");
|
|
#ifdef DEBUG_DEL
|
|
nft_rule_print_save(h, r, NFT_RULE_APPEND, 0);
|
|
#endif
|
|
if (!ret_this)
|
|
DEBUGP("Cannot convert rule: %d\n", ret_this);
|
|
|
|
if (!h->ops->is_same(cs, &this))
|
|
goto out;
|
|
|
|
if (!compare_matches(cs->matches, this.matches)) {
|
|
DEBUGP("Different matches\n");
|
|
goto out;
|
|
}
|
|
|
|
if (!compare_targets(cs->target, this.target)) {
|
|
DEBUGP("Different target\n");
|
|
goto out;
|
|
}
|
|
|
|
if ((!cs->target || !this.target) &&
|
|
strcmp(cs->jumpto, this.jumpto) != 0) {
|
|
DEBUGP("Different verdict\n");
|
|
goto out;
|
|
}
|
|
|
|
ret = true;
|
|
out:
|
|
h->ops->clear_cs(&this);
|
|
return ret;
|
|
}
|
|
|
|
static struct nftnl_rule *
|
|
nft_rule_find(struct nft_handle *h, struct nft_chain *nc,
|
|
struct nftnl_rule *rule, int rulenum)
|
|
{
|
|
struct iptables_command_state cs = {};
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
struct nftnl_rule *r;
|
|
struct nftnl_rule_iter *iter;
|
|
bool found = false;
|
|
|
|
if (rulenum >= 0)
|
|
/* Delete by rule number case */
|
|
return nftnl_rule_lookup_byindex(c, rulenum);
|
|
|
|
iter = nftnl_rule_iter_create(c);
|
|
if (iter == NULL)
|
|
return 0;
|
|
|
|
if (h->ops->init_cs)
|
|
h->ops->init_cs(&cs);
|
|
|
|
if (!h->ops->rule_to_cs(h, rule, &cs))
|
|
return NULL;
|
|
|
|
DEBUGP("comparing ... ");
|
|
#ifdef DEBUG_DEL
|
|
nft_rule_print_save(h, rule, NFT_RULE_APPEND, 0);
|
|
#endif
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
while (r != NULL) {
|
|
found = nft_rule_cmp(h, r, &cs);
|
|
if (found)
|
|
break;
|
|
r = nftnl_rule_iter_next(iter);
|
|
}
|
|
|
|
nftnl_rule_iter_destroy(iter);
|
|
|
|
h->ops->clear_cs(&cs);
|
|
|
|
return found ? r : NULL;
|
|
}
|
|
|
|
int nft_rule_check(struct nft_handle *h, const char *chain,
|
|
const char *table, struct nftnl_rule *rule, bool verbose)
|
|
{
|
|
struct nftnl_rule *r;
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_check;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c)
|
|
goto fail_enoent;
|
|
|
|
r = nft_rule_find(h, c, rule, -1);
|
|
if (r == NULL)
|
|
goto fail_enoent;
|
|
|
|
if (verbose)
|
|
h->ops->print_rule(h, r, 0, FMT_PRINT_RULE);
|
|
|
|
return 1;
|
|
fail_enoent:
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
int nft_rule_delete(struct nft_handle *h, const char *chain,
|
|
const char *table, struct nftnl_rule *rule, bool verbose)
|
|
{
|
|
int ret = 0;
|
|
struct nftnl_rule *r;
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_delete;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
r = nft_rule_find(h, c, rule, -1);
|
|
if (r != NULL) {
|
|
ret =__nft_rule_del(h, r);
|
|
if (ret < 0)
|
|
errno = ENOMEM;
|
|
if (verbose)
|
|
h->ops->print_rule(h, r, 0, FMT_PRINT_RULE);
|
|
} else
|
|
errno = ENOENT;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static struct nftnl_rule *
|
|
nft_rule_add(struct nft_handle *h, const char *chain,
|
|
const char *table, struct nftnl_rule *r,
|
|
struct nftnl_rule *ref, bool verbose)
|
|
{
|
|
uint64_t ref_id;
|
|
|
|
if (ref) {
|
|
ref_id = nftnl_rule_get_u64(ref, NFTNL_RULE_HANDLE);
|
|
if (ref_id > 0) {
|
|
nftnl_rule_set_u64(r, NFTNL_RULE_POSITION, ref_id);
|
|
DEBUGP("adding after rule handle %"PRIu64"\n", ref_id);
|
|
} else {
|
|
ref_id = nftnl_rule_get_u32(ref, NFTNL_RULE_ID);
|
|
if (!ref_id) {
|
|
ref_id = ++h->rule_id;
|
|
nftnl_rule_set_u32(ref, NFTNL_RULE_ID, ref_id);
|
|
}
|
|
nftnl_rule_set_u32(r, NFTNL_RULE_POSITION_ID, ref_id);
|
|
DEBUGP("adding after rule ID %"PRIu64"\n", ref_id);
|
|
}
|
|
}
|
|
|
|
if (!batch_rule_add(h, NFT_COMPAT_RULE_INSERT, r))
|
|
return NULL;
|
|
|
|
if (verbose)
|
|
h->ops->print_rule(h, r, 0, FMT_PRINT_RULE);
|
|
|
|
return r;
|
|
}
|
|
|
|
int nft_rule_insert(struct nft_handle *h, const char *chain,
|
|
const char *table, struct nftnl_rule *new_rule, int rulenum,
|
|
bool verbose)
|
|
{
|
|
struct nftnl_rule *r = NULL;
|
|
struct nft_chain *c;
|
|
|
|
nft_xt_builtin_init(h, table, chain);
|
|
|
|
nft_fn = nft_rule_insert;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
goto err;
|
|
}
|
|
|
|
if (rulenum > 0) {
|
|
r = nft_rule_find(h, c, new_rule, rulenum);
|
|
if (r == NULL) {
|
|
/* special case: iptables allows to insert into
|
|
* rule_count + 1 position.
|
|
*/
|
|
r = nft_rule_find(h, c, new_rule, rulenum - 1);
|
|
if (r != NULL)
|
|
return nft_rule_append(h, chain, table,
|
|
new_rule, NULL, verbose);
|
|
|
|
errno = E2BIG;
|
|
goto err;
|
|
}
|
|
}
|
|
|
|
new_rule = nft_rule_add(h, chain, table, new_rule, r, verbose);
|
|
if (!new_rule)
|
|
goto err;
|
|
|
|
if (r)
|
|
nftnl_chain_rule_insert_at(new_rule, r);
|
|
else
|
|
nftnl_chain_rule_add(new_rule, c->nftnl);
|
|
|
|
return 1;
|
|
err:
|
|
return 0;
|
|
}
|
|
|
|
int nft_rule_delete_num(struct nft_handle *h, const char *chain,
|
|
const char *table, int rulenum, bool verbose)
|
|
{
|
|
int ret = 0;
|
|
struct nftnl_rule *r;
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_delete_num;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
r = nft_rule_find(h, c, NULL, rulenum);
|
|
if (r != NULL) {
|
|
DEBUGP("deleting rule by number %d\n", rulenum);
|
|
ret = __nft_rule_del(h, r);
|
|
if (ret < 0)
|
|
errno = ENOMEM;
|
|
} else
|
|
errno = E2BIG;
|
|
|
|
return ret;
|
|
}
|
|
|
|
int nft_rule_replace(struct nft_handle *h, const char *chain,
|
|
const char *table, struct nftnl_rule *rule,
|
|
int rulenum, bool verbose)
|
|
{
|
|
int ret = 0;
|
|
struct nftnl_rule *r;
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_replace;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
r = nft_rule_find(h, c, rule, rulenum);
|
|
if (r != NULL) {
|
|
DEBUGP("replacing rule with handle=%llu\n",
|
|
(unsigned long long)
|
|
nftnl_rule_get_u64(r, NFTNL_RULE_HANDLE));
|
|
|
|
ret = nft_rule_append(h, chain, table, rule, r, verbose);
|
|
} else
|
|
errno = E2BIG;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int nft_rule_change_counters(struct nft_handle *h, const char *table,
|
|
const char *chain, struct nftnl_rule *rule,
|
|
int rulenum, struct xt_counters *counters,
|
|
uint8_t counter_op, bool verbose)
|
|
{
|
|
struct iptables_command_state cs = {};
|
|
struct nftnl_rule *r, *new_rule;
|
|
struct nft_rule_ctx ctx = {
|
|
.command = NFT_COMPAT_RULE_APPEND,
|
|
};
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_change_counters;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
r = nft_rule_find(h, c, rule, rulenum);
|
|
if (!r) {
|
|
errno = E2BIG;
|
|
return 0;
|
|
}
|
|
|
|
DEBUGP("changing counters of rule with handle=%llu\n",
|
|
(unsigned long long)
|
|
nftnl_rule_get_u64(r, NFTNL_RULE_HANDLE));
|
|
|
|
if (h->ops->init_cs)
|
|
h->ops->init_cs(&cs);
|
|
h->ops->rule_to_cs(h, r, &cs);
|
|
|
|
if (counter_op & CTR_OP_INC_PKTS)
|
|
cs.counters.pcnt += counters->pcnt;
|
|
else if (counter_op & CTR_OP_DEC_PKTS)
|
|
cs.counters.pcnt -= counters->pcnt;
|
|
else
|
|
cs.counters.pcnt = counters->pcnt;
|
|
|
|
if (counter_op & CTR_OP_INC_BYTES)
|
|
cs.counters.bcnt += counters->bcnt;
|
|
else if (counter_op & CTR_OP_DEC_BYTES)
|
|
cs.counters.bcnt -= counters->bcnt;
|
|
else
|
|
cs.counters.bcnt = counters->bcnt;
|
|
|
|
new_rule = nft_rule_new(h, &ctx, chain, table, &cs);
|
|
h->ops->clear_cs(&cs);
|
|
|
|
return nft_rule_append(h, chain, table, new_rule, r, verbose);
|
|
}
|
|
|
|
static int
|
|
__nft_rule_list(struct nft_handle *h, struct nftnl_chain *c,
|
|
int rulenum, unsigned int format,
|
|
void (*cb)(struct nft_handle *h, struct nftnl_rule *r,
|
|
unsigned int num, unsigned int format))
|
|
{
|
|
struct nftnl_rule_iter *iter;
|
|
struct nftnl_rule *r;
|
|
int rule_ctr = 0;
|
|
|
|
if (rulenum > 0) {
|
|
r = nftnl_rule_lookup_byindex(c, rulenum - 1);
|
|
if (!r)
|
|
/* iptables-legacy returns 0 when listing for
|
|
* valid chain but invalid rule number
|
|
*/
|
|
return 1;
|
|
cb(h, r, rulenum, format);
|
|
return 1;
|
|
}
|
|
|
|
iter = nftnl_rule_iter_create(c);
|
|
if (iter == NULL)
|
|
return 0;
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
while (r != NULL) {
|
|
cb(h, r, ++rule_ctr, format);
|
|
r = nftnl_rule_iter_next(iter);
|
|
}
|
|
|
|
nftnl_rule_iter_destroy(iter);
|
|
return 1;
|
|
}
|
|
|
|
static int nft_rule_count(struct nft_handle *h, struct nftnl_chain *c)
|
|
{
|
|
struct nftnl_rule_iter *iter;
|
|
struct nftnl_rule *r;
|
|
int rule_ctr = 0;
|
|
|
|
iter = nftnl_rule_iter_create(c);
|
|
if (iter == NULL)
|
|
return 0;
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
while (r != NULL) {
|
|
rule_ctr++;
|
|
r = nftnl_rule_iter_next(iter);
|
|
}
|
|
|
|
nftnl_rule_iter_destroy(iter);
|
|
return rule_ctr;
|
|
}
|
|
|
|
static void __nft_print_header(struct nft_handle *h,
|
|
struct nft_chain *nc, unsigned int format)
|
|
{
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
const char *chain_name = nftnl_chain_get_str(c, NFTNL_CHAIN_NAME);
|
|
uint32_t refs = nftnl_chain_get_u32(c, NFTNL_CHAIN_USE);
|
|
uint32_t entries = nft_rule_count(h, c);
|
|
struct xt_counters ctrs = {
|
|
.pcnt = nftnl_chain_get_u64(c, NFTNL_CHAIN_PACKETS),
|
|
.bcnt = nftnl_chain_get_u64(c, NFTNL_CHAIN_BYTES),
|
|
};
|
|
const char *pname = NULL;
|
|
|
|
if (nftnl_chain_get(c, NFTNL_CHAIN_HOOKNUM) &&
|
|
nftnl_chain_is_set(c, NFTNL_CHAIN_POLICY))
|
|
pname = policy_name[nftnl_chain_get_u32(c, NFTNL_CHAIN_POLICY)];
|
|
|
|
h->ops->print_header(format, chain_name, pname,
|
|
&ctrs, refs - entries, entries);
|
|
}
|
|
|
|
struct nft_rule_list_cb_data {
|
|
struct nft_handle *h;
|
|
unsigned int format;
|
|
int rulenum;
|
|
bool found;
|
|
bool save_fmt;
|
|
void (*cb)(struct nft_handle *h, struct nftnl_rule *r,
|
|
unsigned int num, unsigned int format);
|
|
};
|
|
|
|
static int nft_rule_list_cb(struct nft_chain *c, void *data)
|
|
{
|
|
struct nft_rule_list_cb_data *d = data;
|
|
|
|
if (!d->save_fmt) {
|
|
if (d->found)
|
|
printf("\n");
|
|
d->found = true;
|
|
|
|
__nft_print_header(d->h, c, d->format);
|
|
}
|
|
|
|
return __nft_rule_list(d->h, c->nftnl, d->rulenum, d->format, d->cb);
|
|
}
|
|
|
|
int nft_rule_list(struct nft_handle *h, const char *chain, const char *table,
|
|
int rulenum, unsigned int format)
|
|
{
|
|
const struct nft_family_ops *ops = h->ops;
|
|
struct nft_rule_list_cb_data d = {
|
|
.h = h,
|
|
.format = format,
|
|
.rulenum = rulenum,
|
|
.cb = ops->print_rule,
|
|
};
|
|
struct nft_chain *c;
|
|
|
|
nft_xt_fake_builtin_chains(h, table, chain);
|
|
nft_assert_table_compatible(h, table, chain);
|
|
|
|
if (chain) {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
if (rulenum)
|
|
d.save_fmt = true; /* skip header printing */
|
|
else if (ops->print_table_header)
|
|
ops->print_table_header(table);
|
|
|
|
nft_rule_list_cb(c, &d);
|
|
return 1;
|
|
}
|
|
|
|
nft_cache_sort_chains(h, table);
|
|
|
|
if (ops->print_table_header)
|
|
ops->print_table_header(table);
|
|
|
|
nft_chain_foreach(h, table, nft_rule_list_cb, &d);
|
|
return 1;
|
|
}
|
|
|
|
static void
|
|
list_save(struct nft_handle *h, struct nftnl_rule *r,
|
|
unsigned int num, unsigned int format)
|
|
{
|
|
nft_rule_print_save(h, r, NFT_RULE_APPEND, format);
|
|
}
|
|
|
|
int nft_chain_foreach(struct nft_handle *h, const char *table,
|
|
int (*cb)(struct nft_chain *c, void *data),
|
|
void *data)
|
|
{
|
|
const struct builtin_table *t;
|
|
struct nft_chain_list *list;
|
|
struct nft_chain *c, *c_bak;
|
|
int i, ret;
|
|
|
|
t = nft_table_builtin_find(h, table);
|
|
if (!t)
|
|
return -1;
|
|
|
|
for (i = 0; i < NF_INET_NUMHOOKS; i++) {
|
|
c = h->cache->table[t->type].base_chains[i];
|
|
if (!c)
|
|
continue;
|
|
|
|
ret = cb(c, data);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
|
|
list = h->cache->table[t->type].chains;
|
|
if (!list)
|
|
return -1;
|
|
|
|
list_for_each_entry_safe(c, c_bak, &list->list, head) {
|
|
ret = cb(c, data);
|
|
if (ret < 0)
|
|
return ret;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static int nft_rule_list_chain_save(struct nft_chain *nc, void *data)
|
|
{
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
const char *chain_name = nftnl_chain_get_str(c, NFTNL_CHAIN_NAME);
|
|
uint32_t policy = nftnl_chain_get_u32(c, NFTNL_CHAIN_POLICY);
|
|
int *counters = data;
|
|
|
|
if (!nft_chain_builtin(c)) {
|
|
printf("-N %s\n", chain_name);
|
|
return 0;
|
|
}
|
|
|
|
/* this is a base chain */
|
|
|
|
printf("-P %s %s", chain_name, policy_name[policy]);
|
|
if (*counters)
|
|
printf(" -c %"PRIu64" %"PRIu64,
|
|
nftnl_chain_get_u64(c, NFTNL_CHAIN_PACKETS),
|
|
nftnl_chain_get_u64(c, NFTNL_CHAIN_BYTES));
|
|
printf("\n");
|
|
return 0;
|
|
}
|
|
|
|
int nft_rule_list_save(struct nft_handle *h, const char *chain,
|
|
const char *table, int rulenum, int counters)
|
|
{
|
|
struct nft_rule_list_cb_data d = {
|
|
.h = h,
|
|
.rulenum = rulenum,
|
|
.save_fmt = true,
|
|
.cb = list_save,
|
|
};
|
|
struct nft_chain *c;
|
|
int ret = 0;
|
|
|
|
nft_xt_fake_builtin_chains(h, table, chain);
|
|
nft_assert_table_compatible(h, table, chain);
|
|
|
|
if (counters < 0)
|
|
d.format = FMT_C_COUNTS;
|
|
else if (counters == 0)
|
|
d.format = FMT_NOCOUNTS;
|
|
|
|
if (chain) {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
if (!rulenum)
|
|
nft_rule_list_chain_save(c, &counters);
|
|
|
|
return nft_rule_list_cb(c, &d);
|
|
}
|
|
|
|
nft_cache_sort_chains(h, table);
|
|
|
|
/* Dump policies and custom chains first */
|
|
nft_chain_foreach(h, table, nft_rule_list_chain_save, &counters);
|
|
|
|
/* Now dump out rules in this table */
|
|
ret = nft_chain_foreach(h, table, nft_rule_list_cb, &d);
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
int nft_rule_zero_counters(struct nft_handle *h, const char *chain,
|
|
const char *table, int rulenum)
|
|
{
|
|
struct iptables_command_state cs = {};
|
|
struct nftnl_rule *r, *new_rule;
|
|
struct nft_rule_ctx ctx = {
|
|
.command = NFT_COMPAT_RULE_APPEND,
|
|
};
|
|
struct nft_chain *c;
|
|
|
|
nft_fn = nft_rule_delete;
|
|
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
r = nft_rule_find(h, c, NULL, rulenum);
|
|
if (r == NULL) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
if (h->ops->init_cs)
|
|
h->ops->init_cs(&cs);
|
|
h->ops->rule_to_cs(h, r, &cs);
|
|
cs.counters.pcnt = cs.counters.bcnt = 0;
|
|
new_rule = nft_rule_new(h, &ctx, chain, table, &cs);
|
|
h->ops->clear_cs(&cs);
|
|
|
|
if (!new_rule)
|
|
return 1;
|
|
|
|
return nft_rule_append(h, chain, table, new_rule, r, false);
|
|
}
|
|
|
|
static void nft_table_print_debug(struct nft_handle *h,
|
|
struct nftnl_table *t, struct nlmsghdr *nlh)
|
|
{
|
|
if (h->verbose > 1) {
|
|
nftnl_table_fprintf(stdout, t, 0, 0);
|
|
fprintf(stdout, "\n");
|
|
}
|
|
if (h->verbose > 2)
|
|
mnl_nlmsg_fprintf(stdout, nlh, nlh->nlmsg_len,
|
|
sizeof(struct nfgenmsg));
|
|
}
|
|
|
|
static void nft_compat_table_batch_add(struct nft_handle *h, uint16_t type,
|
|
uint16_t flags, uint32_t seq,
|
|
struct nftnl_table *table)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(h->batch),
|
|
type, h->family, flags, seq);
|
|
nftnl_table_nlmsg_build_payload(nlh, table);
|
|
nft_table_print_debug(h, table, nlh);
|
|
}
|
|
|
|
static void nft_compat_set_batch_add(struct nft_handle *h, uint16_t type,
|
|
uint16_t flags, uint32_t seq,
|
|
struct nftnl_set *set)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(h->batch),
|
|
type, h->family, flags, seq);
|
|
nftnl_set_nlmsg_build_payload(nlh, set);
|
|
}
|
|
|
|
static void nft_compat_setelem_batch_add(struct nft_handle *h, uint16_t type,
|
|
uint16_t flags, uint32_t *seq,
|
|
struct nftnl_set *set)
|
|
{
|
|
struct nftnl_set_elems_iter *iter;
|
|
struct nlmsghdr *nlh;
|
|
|
|
iter = nftnl_set_elems_iter_create(set);
|
|
if (!iter)
|
|
return;
|
|
|
|
while (nftnl_set_elems_iter_cur(iter)) {
|
|
(*seq)++;
|
|
mnl_nft_batch_continue(h->batch);
|
|
nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(h->batch),
|
|
type, h->family, flags, *seq);
|
|
if (nftnl_set_elems_nlmsg_build_payload_iter(nlh, iter) <= 0)
|
|
break;
|
|
}
|
|
nftnl_set_elems_iter_destroy(iter);
|
|
|
|
if (h->verbose > 1) {
|
|
fprintf(stdout, "set ");
|
|
nftnl_set_fprintf(stdout, set, 0, 0);
|
|
fprintf(stdout, "\n");
|
|
}
|
|
}
|
|
|
|
static void nft_compat_chain_batch_add(struct nft_handle *h, uint16_t type,
|
|
uint16_t flags, uint32_t seq,
|
|
struct nftnl_chain *chain)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(h->batch),
|
|
type, h->family, flags, seq);
|
|
nftnl_chain_nlmsg_build_payload(nlh, chain);
|
|
nft_chain_print_debug(h, chain, nlh);
|
|
}
|
|
|
|
static void nft_compat_rule_batch_add(struct nft_handle *h, uint16_t type,
|
|
uint16_t flags, uint32_t seq,
|
|
struct nftnl_rule *rule)
|
|
{
|
|
struct nlmsghdr *nlh;
|
|
|
|
nlh = nftnl_nlmsg_build_hdr(nftnl_batch_buffer(h->batch),
|
|
type, h->family, flags, seq);
|
|
nftnl_rule_nlmsg_build_payload(nlh, rule);
|
|
nft_rule_print_debug(h, rule, nlh);
|
|
}
|
|
|
|
static void batch_obj_del(struct nft_handle *h, struct obj_update *o)
|
|
{
|
|
switch (o->type) {
|
|
case NFT_COMPAT_TABLE_ADD:
|
|
case NFT_COMPAT_TABLE_FLUSH:
|
|
nftnl_table_free(o->table);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_ZERO:
|
|
case NFT_COMPAT_CHAIN_USER_ADD:
|
|
case NFT_COMPAT_CHAIN_ADD:
|
|
break;
|
|
case NFT_COMPAT_CHAIN_DEL:
|
|
case NFT_COMPAT_CHAIN_USER_FLUSH:
|
|
case NFT_COMPAT_CHAIN_UPDATE:
|
|
case NFT_COMPAT_CHAIN_RENAME:
|
|
nftnl_chain_free(o->chain);
|
|
break;
|
|
case NFT_COMPAT_RULE_APPEND:
|
|
case NFT_COMPAT_RULE_INSERT:
|
|
case NFT_COMPAT_RULE_REPLACE:
|
|
case NFT_COMPAT_RULE_CHANGE_COUNTERS:
|
|
break;
|
|
case NFT_COMPAT_RULE_DELETE:
|
|
case NFT_COMPAT_RULE_FLUSH:
|
|
nftnl_rule_free(o->rule);
|
|
break;
|
|
case NFT_COMPAT_SET_ADD:
|
|
nftnl_set_free(o->set);
|
|
break;
|
|
case NFT_COMPAT_RULE_LIST:
|
|
case NFT_COMPAT_RULE_CHECK:
|
|
case NFT_COMPAT_CHAIN_RESTORE:
|
|
case NFT_COMPAT_RULE_SAVE:
|
|
case NFT_COMPAT_RULE_ZERO:
|
|
case NFT_COMPAT_BRIDGE_USER_CHAIN_UPDATE:
|
|
assert(0);
|
|
break;
|
|
}
|
|
h->obj_list_num--;
|
|
list_del(&o->head);
|
|
free(o);
|
|
}
|
|
|
|
static void nft_refresh_transaction(struct nft_handle *h)
|
|
{
|
|
const char *tablename, *chainname;
|
|
const struct nft_chain *c;
|
|
struct obj_update *n, *tmp;
|
|
bool exists;
|
|
|
|
h->error.lineno = 0;
|
|
|
|
list_for_each_entry_safe(n, tmp, &h->obj_list, head) {
|
|
switch (n->type) {
|
|
case NFT_COMPAT_TABLE_FLUSH:
|
|
tablename = nftnl_table_get_str(n->table, NFTNL_TABLE_NAME);
|
|
if (!tablename)
|
|
continue;
|
|
exists = nft_table_find(h, tablename);
|
|
if (exists)
|
|
n->skip = 0;
|
|
else
|
|
n->skip = 1;
|
|
break;
|
|
case NFT_COMPAT_CHAIN_USER_ADD:
|
|
tablename = nftnl_chain_get_str(n->chain, NFTNL_CHAIN_TABLE);
|
|
if (!tablename)
|
|
continue;
|
|
|
|
chainname = nftnl_chain_get_str(n->chain, NFTNL_CHAIN_NAME);
|
|
if (!chainname)
|
|
continue;
|
|
|
|
if (!h->noflush)
|
|
break;
|
|
|
|
c = nft_chain_find(h, tablename, chainname);
|
|
if (c) {
|
|
n->skip = 1;
|
|
} else if (!c) {
|
|
n->skip = 0;
|
|
}
|
|
break;
|
|
case NFT_COMPAT_RULE_FLUSH:
|
|
tablename = nftnl_rule_get_str(n->rule, NFTNL_RULE_TABLE);
|
|
if (!tablename)
|
|
continue;
|
|
|
|
chainname = nftnl_rule_get_str(n->rule, NFTNL_RULE_CHAIN);
|
|
if (!chainname)
|
|
continue;
|
|
|
|
n->skip = !nft_chain_find(h, tablename, chainname);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_DEL:
|
|
if (!nftnl_chain_get(n->chain, NFTNL_CHAIN_HOOKNUM))
|
|
break;
|
|
n->skip = !nft_may_delete_chain(n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_ZERO:
|
|
tablename = nftnl_chain_get_str(n->chain, NFTNL_CHAIN_TABLE);
|
|
if (!tablename)
|
|
continue;
|
|
|
|
chainname = nftnl_chain_get_str(n->chain, NFTNL_CHAIN_NAME);
|
|
if (!chainname)
|
|
continue;
|
|
|
|
n->skip = nftnl_chain_is_set(n->chain,
|
|
NFTNL_CHAIN_HOOKNUM) &&
|
|
!nft_chain_find(h, tablename, chainname);
|
|
break;
|
|
case NFT_COMPAT_TABLE_ADD:
|
|
case NFT_COMPAT_CHAIN_ADD:
|
|
case NFT_COMPAT_CHAIN_USER_FLUSH:
|
|
case NFT_COMPAT_CHAIN_UPDATE:
|
|
case NFT_COMPAT_CHAIN_RENAME:
|
|
case NFT_COMPAT_RULE_APPEND:
|
|
case NFT_COMPAT_RULE_INSERT:
|
|
case NFT_COMPAT_RULE_REPLACE:
|
|
case NFT_COMPAT_RULE_CHANGE_COUNTERS:
|
|
case NFT_COMPAT_RULE_DELETE:
|
|
case NFT_COMPAT_SET_ADD:
|
|
case NFT_COMPAT_RULE_LIST:
|
|
case NFT_COMPAT_RULE_CHECK:
|
|
case NFT_COMPAT_CHAIN_RESTORE:
|
|
case NFT_COMPAT_RULE_SAVE:
|
|
case NFT_COMPAT_RULE_ZERO:
|
|
case NFT_COMPAT_BRIDGE_USER_CHAIN_UPDATE:
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
static int nft_action(struct nft_handle *h, int action)
|
|
{
|
|
struct obj_update *n, *tmp;
|
|
struct mnl_err *err, *ne;
|
|
unsigned int buflen, i, len;
|
|
bool show_errors = true;
|
|
char errmsg[1024];
|
|
uint32_t seq;
|
|
int ret = 0;
|
|
|
|
retry:
|
|
seq = 1;
|
|
h->batch = mnl_batch_init();
|
|
|
|
mnl_batch_begin(h->batch, h->nft_genid, seq++);
|
|
h->nft_genid++;
|
|
|
|
list_for_each_entry(n, &h->obj_list, head) {
|
|
if (n->skip) {
|
|
n->seq = 0;
|
|
continue;
|
|
}
|
|
|
|
n->seq = seq++;
|
|
switch (n->type) {
|
|
case NFT_COMPAT_TABLE_ADD:
|
|
nft_compat_table_batch_add(h, NFT_MSG_NEWTABLE,
|
|
NLM_F_CREATE, n->seq,
|
|
n->table);
|
|
break;
|
|
case NFT_COMPAT_TABLE_FLUSH:
|
|
nft_compat_table_batch_add(h, NFT_MSG_DELTABLE,
|
|
0,
|
|
n->seq, n->table);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_ADD:
|
|
case NFT_COMPAT_CHAIN_ZERO:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_NEWCHAIN,
|
|
NLM_F_CREATE, n->seq,
|
|
n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_USER_ADD:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_NEWCHAIN,
|
|
NLM_F_EXCL, n->seq,
|
|
n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_DEL:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_DELCHAIN,
|
|
NLM_F_NONREC, n->seq,
|
|
n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_USER_FLUSH:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_DELCHAIN,
|
|
0, n->seq,
|
|
n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_UPDATE:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_NEWCHAIN,
|
|
h->restore ?
|
|
NLM_F_CREATE : 0,
|
|
n->seq, n->chain);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_RENAME:
|
|
nft_compat_chain_batch_add(h, NFT_MSG_NEWCHAIN, 0,
|
|
n->seq, n->chain);
|
|
break;
|
|
case NFT_COMPAT_RULE_APPEND:
|
|
nft_compat_rule_batch_add(h, NFT_MSG_NEWRULE,
|
|
NLM_F_CREATE | NLM_F_APPEND,
|
|
n->seq, n->rule);
|
|
break;
|
|
case NFT_COMPAT_RULE_INSERT:
|
|
nft_compat_rule_batch_add(h, NFT_MSG_NEWRULE,
|
|
NLM_F_CREATE, n->seq,
|
|
n->rule);
|
|
break;
|
|
case NFT_COMPAT_RULE_REPLACE:
|
|
case NFT_COMPAT_RULE_CHANGE_COUNTERS:
|
|
nft_compat_rule_batch_add(h, NFT_MSG_NEWRULE,
|
|
NLM_F_CREATE | NLM_F_REPLACE,
|
|
n->seq, n->rule);
|
|
break;
|
|
case NFT_COMPAT_RULE_DELETE:
|
|
case NFT_COMPAT_RULE_FLUSH:
|
|
nft_compat_rule_batch_add(h, NFT_MSG_DELRULE, 0,
|
|
n->seq, n->rule);
|
|
break;
|
|
case NFT_COMPAT_SET_ADD:
|
|
nft_compat_set_batch_add(h, NFT_MSG_NEWSET,
|
|
NLM_F_CREATE, n->seq, n->set);
|
|
nft_compat_setelem_batch_add(h, NFT_MSG_NEWSETELEM,
|
|
NLM_F_CREATE, &n->seq, n->set);
|
|
seq = n->seq;
|
|
break;
|
|
case NFT_COMPAT_RULE_LIST:
|
|
case NFT_COMPAT_RULE_CHECK:
|
|
case NFT_COMPAT_CHAIN_RESTORE:
|
|
case NFT_COMPAT_RULE_SAVE:
|
|
case NFT_COMPAT_RULE_ZERO:
|
|
case NFT_COMPAT_BRIDGE_USER_CHAIN_UPDATE:
|
|
assert(0);
|
|
return 0;
|
|
}
|
|
|
|
mnl_nft_batch_continue(h->batch);
|
|
}
|
|
|
|
switch (action) {
|
|
case NFT_COMPAT_COMMIT:
|
|
mnl_batch_end(h->batch, seq++);
|
|
break;
|
|
case NFT_COMPAT_ABORT:
|
|
break;
|
|
}
|
|
|
|
errno = 0;
|
|
ret = mnl_batch_talk(h, seq);
|
|
if (ret && errno == ERESTART) {
|
|
nft_rebuild_cache(h);
|
|
|
|
nft_refresh_transaction(h);
|
|
|
|
list_for_each_entry_safe(err, ne, &h->err_list, head)
|
|
mnl_err_list_free(err);
|
|
|
|
mnl_batch_reset(h->batch);
|
|
goto retry;
|
|
}
|
|
|
|
i = 0;
|
|
buflen = sizeof(errmsg);
|
|
|
|
list_for_each_entry_safe(n, tmp, &h->obj_list, head) {
|
|
list_for_each_entry_safe(err, ne, &h->err_list, head) {
|
|
if (err->seqnum > n->seq)
|
|
break;
|
|
|
|
if (err->seqnum == n->seq && show_errors) {
|
|
if (n->error.lineno == 0)
|
|
show_errors = false;
|
|
len = mnl_append_error(h, n, err, errmsg + i, buflen);
|
|
if (len > 0 && len <= buflen) {
|
|
buflen -= len;
|
|
i += len;
|
|
}
|
|
}
|
|
mnl_err_list_free(err);
|
|
}
|
|
batch_obj_del(h, n);
|
|
}
|
|
|
|
nft_release_cache(h);
|
|
mnl_batch_reset(h->batch);
|
|
|
|
if (i)
|
|
xtables_error(RESOURCE_PROBLEM, "%s", errmsg);
|
|
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
static int ebt_add_policy_rule(struct nftnl_chain *c, void *data)
|
|
{
|
|
uint32_t policy = nftnl_chain_get_u32(c, NFTNL_CHAIN_POLICY);
|
|
struct iptables_command_state cs = {
|
|
.eb.bitmask = EBT_NOPROTO,
|
|
};
|
|
struct nftnl_udata_buf *udata;
|
|
struct nft_rule_ctx ctx = {
|
|
.command = NFT_COMPAT_RULE_APPEND,
|
|
};
|
|
struct nft_handle *h = data;
|
|
struct nftnl_rule *r;
|
|
const char *pname;
|
|
|
|
if (nftnl_chain_get(c, NFTNL_CHAIN_HOOKNUM))
|
|
return 0; /* ignore base chains */
|
|
|
|
if (!nftnl_chain_is_set(c, NFTNL_CHAIN_POLICY))
|
|
return 0;
|
|
|
|
nftnl_chain_unset(c, NFTNL_CHAIN_POLICY);
|
|
|
|
switch (policy) {
|
|
case NFT_RETURN:
|
|
return 0; /* return policy is default for nft chains */
|
|
case NF_ACCEPT:
|
|
pname = "ACCEPT";
|
|
break;
|
|
case NF_DROP:
|
|
pname = "DROP";
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
command_jump(&cs, pname);
|
|
|
|
r = nft_rule_new(h, &ctx, nftnl_chain_get_str(c, NFTNL_CHAIN_NAME),
|
|
nftnl_chain_get_str(c, NFTNL_CHAIN_TABLE), &cs);
|
|
ebt_cs_clean(&cs);
|
|
|
|
if (!r)
|
|
return -1;
|
|
|
|
udata = nftnl_udata_buf_alloc(NFT_USERDATA_MAXLEN);
|
|
if (!udata)
|
|
goto err_free_rule;
|
|
|
|
if (!nftnl_udata_put_u32(udata, UDATA_TYPE_EBTABLES_POLICY, 1))
|
|
goto err_free_rule;
|
|
|
|
nftnl_rule_set_data(r, NFTNL_RULE_USERDATA,
|
|
nftnl_udata_buf_data(udata),
|
|
nftnl_udata_buf_len(udata));
|
|
nftnl_udata_buf_free(udata);
|
|
|
|
if (!batch_rule_add(h, NFT_COMPAT_RULE_APPEND, r))
|
|
goto err_free_rule;
|
|
|
|
/* add the rule to chain so it is freed later */
|
|
nftnl_chain_rule_add_tail(r, c);
|
|
|
|
return 0;
|
|
err_free_rule:
|
|
nftnl_rule_free(r);
|
|
return -1;
|
|
}
|
|
|
|
int ebt_set_user_chain_policy(struct nft_handle *h, const char *table,
|
|
const char *chain, const char *policy)
|
|
{
|
|
struct nft_chain *c = nft_chain_find(h, table, chain);
|
|
int pval;
|
|
|
|
if (!c)
|
|
return 0;
|
|
|
|
if (!strcmp(policy, "DROP"))
|
|
pval = NF_DROP;
|
|
else if (!strcmp(policy, "ACCEPT"))
|
|
pval = NF_ACCEPT;
|
|
else if (!strcmp(policy, "RETURN"))
|
|
pval = NFT_RETURN;
|
|
else
|
|
return 0;
|
|
|
|
nftnl_chain_set_u32(c->nftnl, NFTNL_CHAIN_POLICY, pval);
|
|
return 1;
|
|
}
|
|
|
|
static void nft_bridge_commit_prepare(struct nft_handle *h)
|
|
{
|
|
const struct builtin_table *t;
|
|
struct nft_chain_list *list;
|
|
struct nft_chain *c;
|
|
int i;
|
|
|
|
for (i = 0; i < NFT_TABLE_MAX; i++) {
|
|
t = &h->tables[i];
|
|
|
|
if (!t->name)
|
|
continue;
|
|
|
|
list = h->cache->table[t->type].chains;
|
|
if (!list)
|
|
continue;
|
|
|
|
list_for_each_entry(c, &list->list, head) {
|
|
ebt_add_policy_rule(c->nftnl, h);
|
|
}
|
|
}
|
|
}
|
|
|
|
static void assert_chain_exists(struct nft_handle *h,
|
|
const char *table, const char *chain)
|
|
{
|
|
if (chain && !nft_chain_exists(h, table, chain))
|
|
xtables_error(PARAMETER_PROBLEM,
|
|
"Chain '%s' does not exist", chain);
|
|
}
|
|
|
|
static int nft_prepare(struct nft_handle *h)
|
|
{
|
|
struct nft_cmd *cmd, *next;
|
|
int ret = 1;
|
|
|
|
nft_cache_build(h);
|
|
|
|
list_for_each_entry_safe(cmd, next, &h->cmd_list, head) {
|
|
h->error.lineno = cmd->error.lineno;
|
|
|
|
switch (cmd->command) {
|
|
case NFT_COMPAT_TABLE_FLUSH:
|
|
ret = nft_table_flush(h, cmd->table);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_USER_ADD:
|
|
ret = nft_chain_user_add(h, cmd->chain, cmd->table);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_DEL:
|
|
ret = nft_chain_del(h, cmd->chain, cmd->table,
|
|
cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_RESTORE:
|
|
ret = nft_chain_restore(h, cmd->chain, cmd->table);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_UPDATE:
|
|
ret = nft_chain_set(h, cmd->table, cmd->chain,
|
|
cmd->policy, &cmd->counters);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_RENAME:
|
|
ret = nft_chain_user_rename(h, cmd->chain, cmd->table,
|
|
cmd->rename);
|
|
break;
|
|
case NFT_COMPAT_CHAIN_ZERO:
|
|
ret = nft_chain_zero_counters(h, cmd->chain, cmd->table,
|
|
cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_APPEND:
|
|
assert_chain_exists(h, cmd->table, cmd->jumpto);
|
|
ret = nft_rule_append(h, cmd->chain, cmd->table,
|
|
cmd->obj.rule, NULL, cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_INSERT:
|
|
assert_chain_exists(h, cmd->table, cmd->jumpto);
|
|
ret = nft_rule_insert(h, cmd->chain, cmd->table,
|
|
cmd->obj.rule, cmd->rulenum,
|
|
cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_REPLACE:
|
|
assert_chain_exists(h, cmd->table, cmd->jumpto);
|
|
ret = nft_rule_replace(h, cmd->chain, cmd->table,
|
|
cmd->obj.rule, cmd->rulenum,
|
|
cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_DELETE:
|
|
assert_chain_exists(h, cmd->table, cmd->jumpto);
|
|
if (cmd->rulenum >= 0)
|
|
ret = nft_rule_delete_num(h, cmd->chain,
|
|
cmd->table,
|
|
cmd->rulenum,
|
|
cmd->verbose);
|
|
else
|
|
ret = nft_rule_delete(h, cmd->chain, cmd->table,
|
|
cmd->obj.rule, cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_FLUSH:
|
|
ret = nft_rule_flush(h, cmd->chain, cmd->table,
|
|
cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_LIST:
|
|
ret = nft_rule_list(h, cmd->chain, cmd->table,
|
|
cmd->rulenum, cmd->format);
|
|
break;
|
|
case NFT_COMPAT_RULE_CHECK:
|
|
assert_chain_exists(h, cmd->table, cmd->jumpto);
|
|
ret = nft_rule_check(h, cmd->chain, cmd->table,
|
|
cmd->obj.rule, cmd->verbose);
|
|
break;
|
|
case NFT_COMPAT_RULE_ZERO:
|
|
ret = nft_rule_zero_counters(h, cmd->chain, cmd->table,
|
|
cmd->rulenum);
|
|
break;
|
|
case NFT_COMPAT_RULE_SAVE:
|
|
ret = nft_rule_list_save(h, cmd->chain, cmd->table,
|
|
cmd->rulenum,
|
|
cmd->counters_save);
|
|
break;
|
|
case NFT_COMPAT_BRIDGE_USER_CHAIN_UPDATE:
|
|
ret = ebt_set_user_chain_policy(h, cmd->table,
|
|
cmd->chain, cmd->policy);
|
|
break;
|
|
case NFT_COMPAT_SET_ADD:
|
|
nft_xt_builtin_table_init(h, cmd->table);
|
|
batch_set_add(h, NFT_COMPAT_SET_ADD, cmd->obj.set);
|
|
ret = 1;
|
|
break;
|
|
case NFT_COMPAT_TABLE_ADD:
|
|
case NFT_COMPAT_CHAIN_ADD:
|
|
assert(0);
|
|
return 0;
|
|
case NFT_COMPAT_RULE_CHANGE_COUNTERS:
|
|
ret = nft_rule_change_counters(h, cmd->table,
|
|
cmd->chain,
|
|
cmd->obj.rule,
|
|
cmd->rulenum,
|
|
&cmd->counters,
|
|
cmd->counter_op,
|
|
cmd->verbose);
|
|
break;
|
|
}
|
|
|
|
nft_cmd_free(cmd);
|
|
|
|
if (ret == 0)
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int nft_commit(struct nft_handle *h)
|
|
{
|
|
if (!nft_prepare(h))
|
|
return 0;
|
|
|
|
return nft_action(h, NFT_COMPAT_COMMIT);
|
|
}
|
|
|
|
int nft_bridge_commit(struct nft_handle *h)
|
|
{
|
|
if (!nft_prepare(h))
|
|
return 0;
|
|
|
|
nft_bridge_commit_prepare(h);
|
|
|
|
return nft_action(h, NFT_COMPAT_COMMIT);
|
|
}
|
|
|
|
int nft_abort(struct nft_handle *h)
|
|
{
|
|
struct nft_cmd *cmd, *next;
|
|
|
|
list_for_each_entry_safe(cmd, next, &h->cmd_list, head)
|
|
nft_cmd_free(cmd);
|
|
|
|
return nft_action(h, NFT_COMPAT_ABORT);
|
|
}
|
|
|
|
int nft_compatible_revision(const char *name, uint8_t rev, int opt)
|
|
{
|
|
struct mnl_socket *nl;
|
|
char buf[16536];
|
|
struct nlmsghdr *nlh;
|
|
uint32_t portid, seq, type = 0;
|
|
uint32_t pf = AF_INET;
|
|
int ret = 0;
|
|
|
|
switch (opt) {
|
|
case IPT_SO_GET_REVISION_MATCH:
|
|
break;
|
|
case IP6T_SO_GET_REVISION_MATCH:
|
|
pf = AF_INET6;
|
|
break;
|
|
case IPT_SO_GET_REVISION_TARGET:
|
|
type = 1;
|
|
break;
|
|
case IP6T_SO_GET_REVISION_TARGET:
|
|
type = 1;
|
|
pf = AF_INET6;
|
|
break;
|
|
default:
|
|
/* No revision support (arp, ebtables), assume latest version ok */
|
|
return 1;
|
|
}
|
|
|
|
nlh = mnl_nlmsg_put_header(buf);
|
|
nlh->nlmsg_type = (NFNL_SUBSYS_NFT_COMPAT << 8) | NFNL_MSG_COMPAT_GET;
|
|
nlh->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK;
|
|
nlh->nlmsg_seq = seq = time(NULL);
|
|
|
|
struct nfgenmsg *nfg = mnl_nlmsg_put_extra_header(nlh, sizeof(*nfg));
|
|
nfg->nfgen_family = pf;
|
|
nfg->version = NFNETLINK_V0;
|
|
nfg->res_id = 0;
|
|
|
|
mnl_attr_put_strz(nlh, NFTA_COMPAT_NAME, name);
|
|
mnl_attr_put_u32(nlh, NFTA_COMPAT_REV, htonl(rev));
|
|
mnl_attr_put_u32(nlh, NFTA_COMPAT_TYPE, htonl(type));
|
|
|
|
DEBUGP("requesting `%s' rev=%d type=%d via nft_compat\n",
|
|
name, rev, type);
|
|
|
|
nl = mnl_socket_open(NETLINK_NETFILTER);
|
|
if (nl == NULL)
|
|
return 0;
|
|
|
|
if (mnl_socket_bind(nl, 0, MNL_SOCKET_AUTOPID) < 0)
|
|
goto err;
|
|
|
|
portid = mnl_socket_get_portid(nl);
|
|
|
|
if (mnl_socket_sendto(nl, nlh, nlh->nlmsg_len) < 0)
|
|
goto err;
|
|
|
|
ret = mnl_socket_recvfrom(nl, buf, sizeof(buf));
|
|
if (ret == -1)
|
|
goto err;
|
|
|
|
ret = mnl_cb_run(buf, ret, seq, portid, NULL, NULL);
|
|
if (ret == -1)
|
|
goto err;
|
|
|
|
err:
|
|
mnl_socket_close(nl);
|
|
|
|
/* ignore EPERM and errors for revision 0 -
|
|
* this is required for printing extension help texts as user, also
|
|
* helps error messaging on unavailable kernel extension */
|
|
if (ret < 0) {
|
|
if (errno == EPERM)
|
|
return 1;
|
|
if (rev == 0) {
|
|
fprintf(stderr,
|
|
"Warning: Extension %s revision 0 not supported, missing kernel module?\n",
|
|
name);
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
return ret < 0 ? 0 : 1;
|
|
}
|
|
|
|
/* Translates errno numbers into more human-readable form than strerror. */
|
|
const char *nft_strerror(int err)
|
|
{
|
|
unsigned int i;
|
|
static struct table_struct {
|
|
void *fn;
|
|
int err;
|
|
const char *message;
|
|
} table[] =
|
|
{
|
|
{ nft_chain_del, ENOTEMPTY, "Chain is not empty" },
|
|
{ nft_chain_del, EBUSY, "Directory not empty" },
|
|
{ nft_chain_del, EMLINK,
|
|
"Can't delete chain with references left" },
|
|
{ nft_chain_user_add, EEXIST, "Chain already exists" },
|
|
{ nft_chain_user_rename, EEXIST, "File exists" },
|
|
{ nft_rule_insert, E2BIG, "Index of insertion too big" },
|
|
{ nft_rule_check, ENOENT, "Bad rule (does a matching rule exist in that chain?)" },
|
|
{ nft_rule_replace, E2BIG, "Index of replacement too big" },
|
|
{ nft_rule_delete_num, E2BIG, "Index of deletion too big" },
|
|
/* { TC_READ_COUNTER, E2BIG, "Index of counter too big" },
|
|
{ TC_ZERO_COUNTER, E2BIG, "Index of counter too big" }, */
|
|
/* ENOENT for DELETE probably means no matching rule */
|
|
{ nft_rule_delete, ENOENT,
|
|
"Bad rule (does a matching rule exist in that chain?)" },
|
|
{ nft_chain_set, ENOENT, "Bad built-in chain name" },
|
|
{ nft_chain_set, EINVAL, "Bad policy name" },
|
|
{ nft_chain_set, ENXIO, "Bad table name" },
|
|
{ NULL, ELOOP, "Loop found in table" },
|
|
{ NULL, EPERM, "Permission denied (you must be root)" },
|
|
{ NULL, 0, "Incompatible with this kernel" },
|
|
{ NULL, ENOPROTOOPT, "iptables who? (do you need to insmod?)" },
|
|
{ NULL, ENOSYS, "Will be implemented real soon. I promise ;)" },
|
|
{ NULL, ENOMEM, "Memory allocation problem" },
|
|
{ NULL, ENOENT, "No chain/target/match by that name" },
|
|
};
|
|
|
|
for (i = 0; i < ARRAY_SIZE(table); i++) {
|
|
if ((!table[i].fn || table[i].fn == nft_fn)
|
|
&& table[i].err == err)
|
|
return table[i].message;
|
|
}
|
|
|
|
return strerror(err);
|
|
}
|
|
|
|
static int l4proto_expr_get_dreg(struct nftnl_expr *e, uint32_t *dregp)
|
|
{
|
|
const char *name = nftnl_expr_get_str(e, NFTNL_EXPR_NAME);
|
|
uint32_t poff = offsetof(struct iphdr, protocol);
|
|
uint32_t pbase = NFT_PAYLOAD_NETWORK_HEADER;
|
|
|
|
if (!strcmp(name, "payload") &&
|
|
nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_BASE) == pbase &&
|
|
nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_OFFSET) == poff &&
|
|
nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_LEN) == sizeof(uint8_t)) {
|
|
*dregp = nftnl_expr_get_u32(e, NFTNL_EXPR_PAYLOAD_DREG);
|
|
return 0;
|
|
}
|
|
if (!strcmp(name, "meta") &&
|
|
nftnl_expr_get_u32(e, NFTNL_EXPR_META_KEY) == NFT_META_L4PROTO) {
|
|
*dregp = nftnl_expr_get_u32(e, NFTNL_EXPR_META_DREG);
|
|
return 0;
|
|
}
|
|
return -1;
|
|
}
|
|
|
|
static int recover_rule_compat(struct nftnl_rule *r)
|
|
{
|
|
struct nftnl_expr_iter *iter;
|
|
struct nftnl_expr *e;
|
|
uint32_t reg;
|
|
int ret = -1;
|
|
|
|
iter = nftnl_expr_iter_create(r);
|
|
if (!iter)
|
|
return -1;
|
|
|
|
next_expr:
|
|
e = nftnl_expr_iter_next(iter);
|
|
if (!e)
|
|
goto out;
|
|
|
|
/* may be 'ip protocol' or 'meta l4proto' with identical RHS */
|
|
if (l4proto_expr_get_dreg(e, ®) < 0)
|
|
goto next_expr;
|
|
|
|
e = nftnl_expr_iter_next(iter);
|
|
if (!e)
|
|
goto out;
|
|
|
|
if (strcmp("cmp", nftnl_expr_get_str(e, NFTNL_EXPR_NAME)) ||
|
|
reg != nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_SREG))
|
|
goto next_expr;
|
|
|
|
add_compat(r, nftnl_expr_get_u8(e, NFTNL_EXPR_CMP_DATA),
|
|
nftnl_expr_get_u32(e, NFTNL_EXPR_CMP_OP) == NFT_CMP_NEQ);
|
|
ret = 0;
|
|
out:
|
|
nftnl_expr_iter_destroy(iter);
|
|
return ret;
|
|
}
|
|
|
|
struct chain_zero_data {
|
|
struct nft_handle *handle;
|
|
bool verbose;
|
|
};
|
|
|
|
static int __nft_chain_zero_counters(struct nft_chain *nc, void *data)
|
|
{
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
struct chain_zero_data *d = data;
|
|
struct nft_handle *h = d->handle;
|
|
struct nftnl_rule_iter *iter;
|
|
struct nftnl_rule *r;
|
|
struct obj_update *o;
|
|
|
|
if (d->verbose)
|
|
fprintf(stdout, "Zeroing chain `%s'\n",
|
|
nftnl_chain_get_str(c, NFTNL_CHAIN_NAME));
|
|
|
|
if (nftnl_chain_is_set(c, NFTNL_CHAIN_HOOKNUM)) {
|
|
/* zero base chain counters. */
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_PACKETS, 0);
|
|
nftnl_chain_set_u64(c, NFTNL_CHAIN_BYTES, 0);
|
|
nftnl_chain_unset(c, NFTNL_CHAIN_HANDLE);
|
|
o = batch_chain_add(h, NFT_COMPAT_CHAIN_ZERO, c);
|
|
if (!o)
|
|
return -1;
|
|
/* may skip if it is a fake entry */
|
|
o->skip = nc->fake;
|
|
}
|
|
|
|
iter = nftnl_rule_iter_create(c);
|
|
if (iter == NULL)
|
|
return -1;
|
|
|
|
r = nftnl_rule_iter_next(iter);
|
|
while (r != NULL) {
|
|
struct nftnl_expr_iter *ei;
|
|
struct nftnl_expr *e;
|
|
bool zero_needed;
|
|
|
|
ei = nftnl_expr_iter_create(r);
|
|
if (!ei)
|
|
break;
|
|
|
|
e = nftnl_expr_iter_next(ei);
|
|
zero_needed = false;
|
|
while (e != NULL) {
|
|
const char *en = nftnl_expr_get_str(e, NFTNL_EXPR_NAME);
|
|
|
|
if (strcmp(en, "counter") == 0 && (
|
|
nftnl_expr_get_u64(e, NFTNL_EXPR_CTR_PACKETS) ||
|
|
nftnl_expr_get_u64(e, NFTNL_EXPR_CTR_BYTES))) {
|
|
nftnl_expr_set_u64(e, NFTNL_EXPR_CTR_PACKETS, 0);
|
|
nftnl_expr_set_u64(e, NFTNL_EXPR_CTR_BYTES, 0);
|
|
zero_needed = true;
|
|
}
|
|
|
|
e = nftnl_expr_iter_next(ei);
|
|
}
|
|
|
|
nftnl_expr_iter_destroy(ei);
|
|
|
|
if (zero_needed) {
|
|
/*
|
|
* Unset RULE_POSITION for older kernels, we want to replace
|
|
* rule based on its handle only.
|
|
*/
|
|
recover_rule_compat(r);
|
|
nftnl_rule_unset(r, NFTNL_RULE_POSITION);
|
|
if (!batch_rule_add(h, NFT_COMPAT_RULE_REPLACE, r)) {
|
|
nftnl_rule_iter_destroy(iter);
|
|
return -1;
|
|
}
|
|
}
|
|
r = nftnl_rule_iter_next(iter);
|
|
}
|
|
|
|
nftnl_rule_iter_destroy(iter);
|
|
return 0;
|
|
}
|
|
|
|
int nft_chain_zero_counters(struct nft_handle *h, const char *chain,
|
|
const char *table, bool verbose)
|
|
{
|
|
struct chain_zero_data d = {
|
|
.handle = h,
|
|
.verbose = verbose,
|
|
};
|
|
struct nft_chain *c;
|
|
int ret = 0;
|
|
|
|
nft_xt_fake_builtin_chains(h, table, chain);
|
|
|
|
if (chain) {
|
|
c = nft_chain_find(h, table, chain);
|
|
if (!c) {
|
|
errno = ENOENT;
|
|
return 0;
|
|
}
|
|
|
|
ret = __nft_chain_zero_counters(c, &d);
|
|
goto err;
|
|
}
|
|
|
|
if (verbose)
|
|
nft_cache_sort_chains(h, table);
|
|
|
|
ret = nft_chain_foreach(h, table, __nft_chain_zero_counters, &d);
|
|
err:
|
|
/* the core expects 1 for success and 0 for error */
|
|
return ret == 0 ? 1 : 0;
|
|
}
|
|
|
|
uint32_t nft_invflags2cmp(uint32_t invflags, uint32_t flag)
|
|
{
|
|
if (invflags & flag)
|
|
return NFT_CMP_NEQ;
|
|
|
|
return NFT_CMP_EQ;
|
|
}
|
|
|
|
static const char *supported_exprs[] = {
|
|
"match",
|
|
"target",
|
|
"payload",
|
|
"meta",
|
|
"cmp",
|
|
"bitwise",
|
|
"counter",
|
|
"immediate",
|
|
"lookup",
|
|
"range",
|
|
};
|
|
|
|
|
|
static int nft_is_expr_compatible(struct nftnl_expr *expr, void *data)
|
|
{
|
|
const char *name = nftnl_expr_get_str(expr, NFTNL_EXPR_NAME);
|
|
int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(supported_exprs); i++) {
|
|
if (strcmp(supported_exprs[i], name) == 0)
|
|
return 0;
|
|
}
|
|
|
|
if (!strcmp(name, "limit") &&
|
|
nftnl_expr_get_u32(expr, NFTNL_EXPR_LIMIT_TYPE) == NFT_LIMIT_PKTS &&
|
|
nftnl_expr_get_u32(expr, NFTNL_EXPR_LIMIT_FLAGS) == 0)
|
|
return 0;
|
|
|
|
if (!strcmp(name, "log") &&
|
|
nftnl_expr_is_set(expr, NFTNL_EXPR_LOG_GROUP))
|
|
return 0;
|
|
|
|
return -1;
|
|
}
|
|
|
|
static int nft_is_rule_compatible(struct nftnl_rule *rule, void *data)
|
|
{
|
|
return nftnl_expr_foreach(rule, nft_is_expr_compatible, NULL);
|
|
}
|
|
|
|
static int nft_is_chain_compatible(struct nft_chain *nc, void *data)
|
|
{
|
|
struct nftnl_chain *c = nc->nftnl;
|
|
|
|
return nftnl_rule_foreach(c, nft_is_rule_compatible, NULL);
|
|
}
|
|
|
|
bool nft_is_table_compatible(struct nft_handle *h,
|
|
const char *table, const char *chain)
|
|
{
|
|
if (chain) {
|
|
struct nft_chain *c = nft_chain_find(h, table, chain);
|
|
|
|
return !c || !nft_is_chain_compatible(c, h);
|
|
}
|
|
|
|
return !nft_chain_foreach(h, table, nft_is_chain_compatible, h);
|
|
}
|
|
|
|
bool nft_is_table_tainted(struct nft_handle *h, const char *table)
|
|
{
|
|
const struct builtin_table *t = nft_table_builtin_find(h, table);
|
|
|
|
return t ? h->cache->table[t->type].tainted : false;
|
|
}
|
|
|
|
void nft_assert_table_compatible(struct nft_handle *h,
|
|
const char *table, const char *chain)
|
|
{
|
|
const char *pfx = "", *sfx = "";
|
|
|
|
if (nft_is_table_compatible(h, table, chain)) {
|
|
if (nft_is_table_tainted(h, table))
|
|
printf("# Table `%s' contains incompatible base-chains, use 'nft' tool to list them.\n",
|
|
table);
|
|
return;
|
|
}
|
|
|
|
if (chain) {
|
|
pfx = "chain `";
|
|
sfx = "' in ";
|
|
} else {
|
|
chain = "";
|
|
}
|
|
xtables_error(OTHER_PROBLEM,
|
|
"%s%s%stable `%s' is incompatible, use 'nft' tool.",
|
|
pfx, chain, sfx, table);
|
|
}
|