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![Pankaj Bharadiya](/assets/img/avatar_default.png)
Replace all the occurrences of FIELD_SIZEOF() with sizeof_field() except at places where these are defined. Later patches will remove the unused definition of FIELD_SIZEOF(). This patch is generated using following script: EXCLUDE_FILES="include/linux/stddef.h|include/linux/kernel.h" git grep -l -e "\bFIELD_SIZEOF\b" | while read file; do if [[ "$file" =~ $EXCLUDE_FILES ]]; then continue fi sed -i -e 's/\bFIELD_SIZEOF\b/sizeof_field/g' $file; done Signed-off-by: Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@intel.com> Link: https://lore.kernel.org/r/20190924105839.110713-3-pankaj.laxminarayan.bharadiya@intel.com Co-developed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Kees Cook <keescook@chromium.org> Acked-by: David Miller <davem@davemloft.net> # for net
294 lines
7.3 KiB
C
294 lines
7.3 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (c) 2014 Arturo Borrero Gonzalez <arturo@debian.org>
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*/
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/module.h>
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#include <linux/netlink.h>
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#include <linux/netfilter.h>
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#include <linux/netfilter/nf_tables.h>
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#include <net/netfilter/nf_nat.h>
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#include <net/netfilter/nf_nat_redirect.h>
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#include <net/netfilter/nf_tables.h>
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struct nft_redir {
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enum nft_registers sreg_proto_min:8;
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enum nft_registers sreg_proto_max:8;
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u16 flags;
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};
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static const struct nla_policy nft_redir_policy[NFTA_REDIR_MAX + 1] = {
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[NFTA_REDIR_REG_PROTO_MIN] = { .type = NLA_U32 },
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[NFTA_REDIR_REG_PROTO_MAX] = { .type = NLA_U32 },
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[NFTA_REDIR_FLAGS] = { .type = NLA_U32 },
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};
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static int nft_redir_validate(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nft_data **data)
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{
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int err;
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err = nft_chain_validate_dependency(ctx->chain, NFT_CHAIN_T_NAT);
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if (err < 0)
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return err;
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return nft_chain_validate_hooks(ctx->chain,
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(1 << NF_INET_PRE_ROUTING) |
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(1 << NF_INET_LOCAL_OUT));
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}
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static int nft_redir_init(const struct nft_ctx *ctx,
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const struct nft_expr *expr,
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const struct nlattr * const tb[])
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{
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struct nft_redir *priv = nft_expr_priv(expr);
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unsigned int plen;
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int err;
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plen = sizeof_field(struct nf_nat_range, min_addr.all);
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if (tb[NFTA_REDIR_REG_PROTO_MIN]) {
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priv->sreg_proto_min =
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nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MIN]);
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err = nft_validate_register_load(priv->sreg_proto_min, plen);
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if (err < 0)
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return err;
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if (tb[NFTA_REDIR_REG_PROTO_MAX]) {
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priv->sreg_proto_max =
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nft_parse_register(tb[NFTA_REDIR_REG_PROTO_MAX]);
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err = nft_validate_register_load(priv->sreg_proto_max,
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plen);
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if (err < 0)
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return err;
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} else {
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priv->sreg_proto_max = priv->sreg_proto_min;
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}
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}
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if (tb[NFTA_REDIR_FLAGS]) {
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priv->flags = ntohl(nla_get_be32(tb[NFTA_REDIR_FLAGS]));
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if (priv->flags & ~NF_NAT_RANGE_MASK)
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return -EINVAL;
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}
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return nf_ct_netns_get(ctx->net, ctx->family);
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}
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static int nft_redir_dump(struct sk_buff *skb, const struct nft_expr *expr)
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{
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const struct nft_redir *priv = nft_expr_priv(expr);
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if (priv->sreg_proto_min) {
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if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MIN,
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priv->sreg_proto_min))
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goto nla_put_failure;
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if (nft_dump_register(skb, NFTA_REDIR_REG_PROTO_MAX,
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priv->sreg_proto_max))
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goto nla_put_failure;
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}
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if (priv->flags != 0 &&
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nla_put_be32(skb, NFTA_REDIR_FLAGS, htonl(priv->flags)))
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goto nla_put_failure;
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return 0;
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nla_put_failure:
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return -1;
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}
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static void nft_redir_ipv4_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_redir *priv = nft_expr_priv(expr);
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struct nf_nat_ipv4_multi_range_compat mr;
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memset(&mr, 0, sizeof(mr));
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if (priv->sreg_proto_min) {
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mr.range[0].min.all = (__force __be16)nft_reg_load16(
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®s->data[priv->sreg_proto_min]);
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mr.range[0].max.all = (__force __be16)nft_reg_load16(
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®s->data[priv->sreg_proto_max]);
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mr.range[0].flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
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}
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mr.range[0].flags |= priv->flags;
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regs->verdict.code = nf_nat_redirect_ipv4(pkt->skb, &mr, nft_hook(pkt));
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}
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static void
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nft_redir_ipv4_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
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{
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nf_ct_netns_put(ctx->net, NFPROTO_IPV4);
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}
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static struct nft_expr_type nft_redir_ipv4_type;
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static const struct nft_expr_ops nft_redir_ipv4_ops = {
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.type = &nft_redir_ipv4_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
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.eval = nft_redir_ipv4_eval,
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.init = nft_redir_init,
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.destroy = nft_redir_ipv4_destroy,
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.dump = nft_redir_dump,
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.validate = nft_redir_validate,
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};
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static struct nft_expr_type nft_redir_ipv4_type __read_mostly = {
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.family = NFPROTO_IPV4,
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.name = "redir",
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.ops = &nft_redir_ipv4_ops,
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.policy = nft_redir_policy,
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.maxattr = NFTA_REDIR_MAX,
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.owner = THIS_MODULE,
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};
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#ifdef CONFIG_NF_TABLES_IPV6
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static void nft_redir_ipv6_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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struct nft_redir *priv = nft_expr_priv(expr);
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struct nf_nat_range2 range;
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memset(&range, 0, sizeof(range));
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if (priv->sreg_proto_min) {
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range.min_proto.all = (__force __be16)nft_reg_load16(
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®s->data[priv->sreg_proto_min]);
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range.max_proto.all = (__force __be16)nft_reg_load16(
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®s->data[priv->sreg_proto_max]);
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range.flags |= NF_NAT_RANGE_PROTO_SPECIFIED;
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}
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range.flags |= priv->flags;
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regs->verdict.code =
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nf_nat_redirect_ipv6(pkt->skb, &range, nft_hook(pkt));
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}
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static void
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nft_redir_ipv6_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
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{
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nf_ct_netns_put(ctx->net, NFPROTO_IPV6);
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}
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static struct nft_expr_type nft_redir_ipv6_type;
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static const struct nft_expr_ops nft_redir_ipv6_ops = {
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.type = &nft_redir_ipv6_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
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.eval = nft_redir_ipv6_eval,
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.init = nft_redir_init,
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.destroy = nft_redir_ipv6_destroy,
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.dump = nft_redir_dump,
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.validate = nft_redir_validate,
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};
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static struct nft_expr_type nft_redir_ipv6_type __read_mostly = {
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.family = NFPROTO_IPV6,
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.name = "redir",
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.ops = &nft_redir_ipv6_ops,
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.policy = nft_redir_policy,
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.maxattr = NFTA_REDIR_MAX,
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.owner = THIS_MODULE,
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};
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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static void nft_redir_inet_eval(const struct nft_expr *expr,
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struct nft_regs *regs,
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const struct nft_pktinfo *pkt)
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{
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switch (nft_pf(pkt)) {
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case NFPROTO_IPV4:
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return nft_redir_ipv4_eval(expr, regs, pkt);
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case NFPROTO_IPV6:
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return nft_redir_ipv6_eval(expr, regs, pkt);
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}
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WARN_ON_ONCE(1);
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}
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static void
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nft_redir_inet_destroy(const struct nft_ctx *ctx, const struct nft_expr *expr)
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{
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nf_ct_netns_put(ctx->net, NFPROTO_INET);
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}
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static struct nft_expr_type nft_redir_inet_type;
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static const struct nft_expr_ops nft_redir_inet_ops = {
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.type = &nft_redir_inet_type,
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.size = NFT_EXPR_SIZE(sizeof(struct nft_redir)),
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.eval = nft_redir_inet_eval,
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.init = nft_redir_init,
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.destroy = nft_redir_inet_destroy,
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.dump = nft_redir_dump,
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.validate = nft_redir_validate,
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};
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static struct nft_expr_type nft_redir_inet_type __read_mostly = {
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.family = NFPROTO_INET,
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.name = "redir",
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.ops = &nft_redir_inet_ops,
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.policy = nft_redir_policy,
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.maxattr = NFTA_MASQ_MAX,
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.owner = THIS_MODULE,
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};
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static int __init nft_redir_module_init_inet(void)
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{
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return nft_register_expr(&nft_redir_inet_type);
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}
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#else
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static inline int nft_redir_module_init_inet(void) { return 0; }
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#endif
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static int __init nft_redir_module_init(void)
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{
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int ret = nft_register_expr(&nft_redir_ipv4_type);
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if (ret)
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return ret;
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#ifdef CONFIG_NF_TABLES_IPV6
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ret = nft_register_expr(&nft_redir_ipv6_type);
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if (ret) {
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nft_unregister_expr(&nft_redir_ipv4_type);
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return ret;
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}
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#endif
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ret = nft_redir_module_init_inet();
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if (ret < 0) {
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nft_unregister_expr(&nft_redir_ipv4_type);
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#ifdef CONFIG_NF_TABLES_IPV6
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nft_unregister_expr(&nft_redir_ipv6_type);
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#endif
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return ret;
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}
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return ret;
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}
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static void __exit nft_redir_module_exit(void)
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{
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nft_unregister_expr(&nft_redir_ipv4_type);
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#ifdef CONFIG_NF_TABLES_IPV6
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nft_unregister_expr(&nft_redir_ipv6_type);
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#endif
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#ifdef CONFIG_NF_TABLES_INET
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nft_unregister_expr(&nft_redir_inet_type);
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#endif
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}
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module_init(nft_redir_module_init);
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module_exit(nft_redir_module_exit);
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MODULE_LICENSE("GPL");
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MODULE_AUTHOR("Arturo Borrero Gonzalez <arturo@debian.org>");
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MODULE_ALIAS_NFT_EXPR("redir");
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