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netfilter: nftables: add helper function to set the base sequence number

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[ 802b805162a1b7d8391c40ac8a878e9e63287aff ]

This patch adds a helper function to calculate the base sequence number
field that is stored in the nfnetlink header. Use the helper function
whenever possible.

Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Pablo Neira Ayuso 2023-07-05 18:54:15 +02:00 committed by Greg Kroah-Hartman
parent ef35dd70a3
commit fa498dead9
1 changed files with 14 additions and 9 deletions
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23
net/netfilter/nf_tables_api.c
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@ -588,6 +588,11 @@ nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
return ERR_PTR(-ENOENT);
}
static __be16 nft_base_seq(const struct net *net)
{
return htons(net->nft.base_seq & 0xffff);
}
static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 },
@ -610,7 +615,7 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
@ -1274,7 +1279,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
goto nla_put_failure;
@ -2366,7 +2371,7 @@ static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
goto nla_put_failure;
@ -3325,7 +3330,7 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = ctx->family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(ctx->net);
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure;
@ -4180,7 +4185,7 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = table->family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
goto nla_put_failure;
@ -4252,7 +4257,7 @@ static int nf_tables_fill_setelem_info(struct sk_buff *skb,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = ctx->family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(ctx->net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(ctx->net);
if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure;
@ -5383,7 +5388,7 @@ static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
@ -6059,7 +6064,7 @@ static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
@ -6297,7 +6302,7 @@ static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = AF_UNSPEC;
nfmsg->version = NFNETLINK_V0;
nfmsg->res_id = htons(net->nft.base_seq & 0xffff);
nfmsg->res_id = nft_base_seq(net);
if (nla_put_be32(skb, NFTA_GEN_ID, htonl(net->nft.base_seq)) ||
nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||