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// SPDX-License-Identifier: GPL-2.0-only
#include <linux/ethtool_netlink.h>
#include <net/udp_tunnel.h>
#include "bitset.h"
#include "common.h"
#include "netlink.h"
static const struct nla_policy
ethtool_tunnel_info_policy[ETHTOOL_A_TUNNEL_INFO_MAX + 1] = {
[ETHTOOL_A_TUNNEL_INFO_UNSPEC] = { .type = NLA_REJECT },
[ETHTOOL_A_TUNNEL_INFO_HEADER] = { .type = NLA_NESTED },
};
static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
static ssize_t
ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
struct netlink_ext_ack *extack)
{
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
const struct udp_tunnel_nic_info *info;
unsigned int i;
size_t size;
int ret;
info = req_base->dev->udp_tunnel_nic_info;
if (!info) {
NL_SET_ERR_MSG(extack,
"device does not report tunnel offload info");
return -EOPNOTSUPP;
}
size = nla_total_size(0); /* _INFO_UDP_PORTS */
for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
if (!info->tables[i].n_entries)
return size;
size += nla_total_size(0); /* _UDP_TABLE */
size += nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
ret = ethnl_bitset32_size(&info->tables[i].tunnel_types, NULL,
__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
udp_tunnel_type_names, compact);
if (ret < 0)
return ret;
size += ret;
size += udp_tunnel_nic_dump_size(req_base->dev, i);
}
return size;
}
static int
ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
struct sk_buff *skb)
{
bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
const struct udp_tunnel_nic_info *info;
struct nlattr *ports, *table;
unsigned int i;
info = req_base->dev->udp_tunnel_nic_info;
if (!info)
return -EOPNOTSUPP;
ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
if (!ports)
return -EMSGSIZE;
for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
if (!info->tables[i].n_entries)
break;
table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
if (!table)
goto err_cancel_ports;
if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
info->tables[i].n_entries))
goto err_cancel_table;
if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
&info->tables[i].tunnel_types, NULL,
__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
udp_tunnel_type_names, compact))
goto err_cancel_table;
if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
goto err_cancel_table;
nla_nest_end(skb, table);
}
nla_nest_end(skb, ports);
return 0;
err_cancel_table:
nla_nest_cancel(skb, table);
err_cancel_ports:
nla_nest_cancel(skb, ports);
return -EMSGSIZE;
}
static int
ethnl_tunnel_info_req_parse(struct ethnl_req_info *req_info,
const struct nlmsghdr *nlhdr, struct net *net,
struct netlink_ext_ack *extack, bool require_dev)
{
struct nlattr *tb[ETHTOOL_A_TUNNEL_INFO_MAX + 1];
int ret;
ret = nlmsg_parse(nlhdr, GENL_HDRLEN, tb, ETHTOOL_A_TUNNEL_INFO_MAX,
ethtool_tunnel_info_policy, extack);
if (ret < 0)
return ret;
return ethnl_parse_header_dev_get(req_info,
tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
net, extack, require_dev);
}
int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
{
struct ethnl_req_info req_info = {};
struct sk_buff *rskb;
void *reply_payload;
int reply_len;
int ret;
ret = ethnl_tunnel_info_req_parse(&req_info, info->nlhdr,
genl_info_net(info), info->extack,
true);
if (ret < 0)
return ret;
rtnl_lock();
ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
if (ret < 0)
goto err_unlock_rtnl;
reply_len = ret + ethnl_reply_header_size();
rskb = ethnl_reply_init(reply_len, req_info.dev,
ETHTOOL_MSG_TUNNEL_INFO_GET,
ETHTOOL_A_TUNNEL_INFO_HEADER,
info, &reply_payload);
if (!rskb) {
ret = -ENOMEM;
goto err_unlock_rtnl;
}
ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
if (ret)
goto err_free_msg;
rtnl_unlock();
dev_put(req_info.dev);
genlmsg_end(rskb, reply_payload);
return genlmsg_reply(rskb, info);
err_free_msg:
nlmsg_free(rskb);
err_unlock_rtnl:
rtnl_unlock();
dev_put(req_info.dev);
return ret;
}
struct ethnl_tunnel_info_dump_ctx {
struct ethnl_req_info req_info;
int pos_hash;
int pos_idx;
};
int ethnl_tunnel_info_start(struct netlink_callback *cb)
{
struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
int ret;
BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
memset(ctx, 0, sizeof(*ctx));
ret = ethnl_tunnel_info_req_parse(&ctx->req_info, cb->nlh,
sock_net(cb->skb->sk), cb->extack,
false);
if (ctx->req_info.dev) {
dev_put(ctx->req_info.dev);
ctx->req_info.dev = NULL;
}
return ret;
}
int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
{
struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
struct net *net = sock_net(skb->sk);
int s_idx = ctx->pos_idx;
int h, idx = 0;
int ret = 0;
void *ehdr;
rtnl_lock();
cb->seq = net->dev_base_seq;
for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
struct hlist_head *head;
struct net_device *dev;
head = &net->dev_index_head[h];
idx = 0;
hlist_for_each_entry(dev, head, index_hlist) {
if (idx < s_idx)
goto cont;
ehdr = ethnl_dump_put(skb, cb,
ETHTOOL_MSG_TUNNEL_INFO_GET);
if (!ehdr) {
ret = -EMSGSIZE;
goto out;
}
ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
if (ret < 0) {
genlmsg_cancel(skb, ehdr);
goto out;
}
ctx->req_info.dev = dev;
ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
ctx->req_info.dev = NULL;
if (ret < 0) {
genlmsg_cancel(skb, ehdr);
if (ret == -EOPNOTSUPP)
goto cont;
goto out;
}
genlmsg_end(skb, ehdr);
cont:
idx++;
}
}
out:
rtnl_unlock();
ctx->pos_hash = h;
ctx->pos_idx = idx;
nl_dump_check_consistent(cb, nlmsg_hdr(skb));
if (ret == -EMSGSIZE && skb->len)
return skb->len;
return ret;
}
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