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

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[ Upstream commit 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: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Pablo Neira Ayuso
2021-03-31 00:18:02 +02:00
committed by Greg Kroah-Hartman
parent e2a49009ba
commit 06fde3cd0b
1 changed files with 14 additions and 9 deletions
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23
net/netfilter/nf_tables_api.c
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@@ -683,6 +683,11 @@ nf_tables_chain_type_lookup(struct net *net, const struct nlattr *nla,
return ERR_PTR(-ENOENT); 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] = { static const struct nla_policy nft_table_policy[NFTA_TABLE_MAX + 1] = {
[NFTA_TABLE_NAME] = { .type = NLA_STRING, [NFTA_TABLE_NAME] = { .type = NLA_STRING,
.len = NFT_TABLE_MAXNAMELEN - 1 }, .len = NFT_TABLE_MAXNAMELEN - 1 },
@@ -707,7 +712,7 @@ static int nf_tables_fill_table_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family; nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0; 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) || if (nla_put_string(skb, NFTA_TABLE_NAME, table->name) ||
nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) || nla_put_be32(skb, NFTA_TABLE_FLAGS, htonl(table->flags)) ||
@@ -1448,7 +1453,7 @@ static int nf_tables_fill_chain_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family; nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0; 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)) if (nla_put_string(skb, NFTA_CHAIN_TABLE, table->name))
goto nla_put_failure; goto nla_put_failure;
@@ -2810,7 +2815,7 @@ static int nf_tables_fill_rule_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family; nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0; 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)) if (nla_put_string(skb, NFTA_RULE_TABLE, table->name))
goto nla_put_failure; goto nla_put_failure;
@@ -3801,7 +3806,7 @@ static int nf_tables_fill_set(struct sk_buff *skb, const struct nft_ctx *ctx,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = ctx->family; nfmsg->nfgen_family = ctx->family;
nfmsg->version = NFNETLINK_V0; 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)) if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure; goto nla_put_failure;
@@ -4751,7 +4756,7 @@ static int nf_tables_dump_set(struct sk_buff *skb, struct netlink_callback *cb)
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = table->family; nfmsg->nfgen_family = table->family;
nfmsg->version = NFNETLINK_V0; 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)) if (nla_put_string(skb, NFTA_SET_ELEM_LIST_TABLE, table->name))
goto nla_put_failure; goto nla_put_failure;
@@ -4823,7 +4828,7 @@ static int nf_tables_fill_setelem_info(struct sk_buff *skb,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = ctx->family; nfmsg->nfgen_family = ctx->family;
nfmsg->version = NFNETLINK_V0; 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)) if (nla_put_string(skb, NFTA_SET_TABLE, ctx->table->name))
goto nla_put_failure; goto nla_put_failure;
@@ -6092,7 +6097,7 @@ static int nf_tables_fill_obj_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family; nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0; 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) || if (nla_put_string(skb, NFTA_OBJ_TABLE, table->name) ||
nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) || nla_put_string(skb, NFTA_OBJ_NAME, obj->key.name) ||
@@ -7004,7 +7009,7 @@ static int nf_tables_fill_flowtable_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = family; nfmsg->nfgen_family = family;
nfmsg->version = NFNETLINK_V0; 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) || if (nla_put_string(skb, NFTA_FLOWTABLE_TABLE, flowtable->table->name) ||
nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) || nla_put_string(skb, NFTA_FLOWTABLE_NAME, flowtable->name) ||
@@ -7249,7 +7254,7 @@ static int nf_tables_fill_gen_info(struct sk_buff *skb, struct net *net,
nfmsg = nlmsg_data(nlh); nfmsg = nlmsg_data(nlh);
nfmsg->nfgen_family = AF_UNSPEC; nfmsg->nfgen_family = AF_UNSPEC;
nfmsg->version = NFNETLINK_V0; 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)) || 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))) || nla_put_be32(skb, NFTA_GEN_PROC_PID, htonl(task_pid_nr(current))) ||