![Jakub Kicinski](/assets/img/avatar_default.png)
To get the most out of parsing by the core, and to allow dumping full policies we need to specify which policy applies to nested attrs. For headers it's ethnl_header_policy. $ sed -i 's@\(ETHTOOL_A_.*HEADER\].*=\) { .type = NLA_NESTED },@\1\n\t\tNLA_POLICY_NESTED(ethnl_header_policy),@' net/ethtool/* Signed-off-by: Jakub Kicinski <kuba@kernel.org> Signed-off-by: David S. Miller <davem@davemloft.net>
299 lines
7 KiB
C
299 lines
7 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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#include <linux/ethtool_netlink.h>
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#include <net/udp_tunnel.h>
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#include <net/vxlan.h>
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#include "bitset.h"
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#include "common.h"
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#include "netlink.h"
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const struct nla_policy ethnl_tunnel_info_get_policy[] = {
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[ETHTOOL_A_TUNNEL_INFO_HEADER] =
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NLA_POLICY_NESTED(ethnl_header_policy),
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};
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static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
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static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
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static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
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ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
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static ssize_t ethnl_udp_table_reply_size(unsigned int types, bool compact)
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{
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ssize_t size;
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size = ethnl_bitset32_size(&types, NULL, __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
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udp_tunnel_type_names, compact);
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if (size < 0)
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return size;
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return size +
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nla_total_size(0) + /* _UDP_TABLE */
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nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
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}
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static ssize_t
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ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
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struct netlink_ext_ack *extack)
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{
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bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
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const struct udp_tunnel_nic_info *info;
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unsigned int i;
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ssize_t ret;
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size_t size;
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info = req_base->dev->udp_tunnel_nic_info;
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if (!info) {
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NL_SET_ERR_MSG(extack,
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"device does not report tunnel offload info");
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return -EOPNOTSUPP;
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}
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size = nla_total_size(0); /* _INFO_UDP_PORTS */
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for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
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if (!info->tables[i].n_entries)
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break;
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ret = ethnl_udp_table_reply_size(info->tables[i].tunnel_types,
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compact);
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if (ret < 0)
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return ret;
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size += ret;
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size += udp_tunnel_nic_dump_size(req_base->dev, i);
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}
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if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
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ret = ethnl_udp_table_reply_size(0, compact);
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if (ret < 0)
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return ret;
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size += ret;
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size += nla_total_size(0) + /* _TABLE_ENTRY */
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nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
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nla_total_size(sizeof(u32)); /* _ENTRY_TYPE */
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}
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return size;
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}
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static int
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ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
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struct sk_buff *skb)
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{
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bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
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const struct udp_tunnel_nic_info *info;
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struct nlattr *ports, *table, *entry;
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unsigned int i;
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info = req_base->dev->udp_tunnel_nic_info;
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if (!info)
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return -EOPNOTSUPP;
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ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
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if (!ports)
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return -EMSGSIZE;
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for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
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if (!info->tables[i].n_entries)
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break;
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table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
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if (!table)
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goto err_cancel_ports;
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if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
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info->tables[i].n_entries))
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goto err_cancel_table;
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if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
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&info->tables[i].tunnel_types, NULL,
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__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
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udp_tunnel_type_names, compact))
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goto err_cancel_table;
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if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
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goto err_cancel_table;
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nla_nest_end(skb, table);
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}
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if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
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u32 zero = 0;
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table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
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if (!table)
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goto err_cancel_ports;
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if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE, 1))
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goto err_cancel_table;
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if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
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&zero, NULL,
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__ETHTOOL_UDP_TUNNEL_TYPE_CNT,
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udp_tunnel_type_names, compact))
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goto err_cancel_table;
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entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
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if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
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htons(IANA_VXLAN_UDP_PORT)) ||
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nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
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ilog2(UDP_TUNNEL_TYPE_VXLAN)))
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goto err_cancel_entry;
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nla_nest_end(skb, entry);
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nla_nest_end(skb, table);
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}
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nla_nest_end(skb, ports);
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return 0;
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err_cancel_entry:
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nla_nest_cancel(skb, entry);
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err_cancel_table:
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nla_nest_cancel(skb, table);
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err_cancel_ports:
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nla_nest_cancel(skb, ports);
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return -EMSGSIZE;
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}
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int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
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{
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struct ethnl_req_info req_info = {};
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struct nlattr **tb = info->attrs;
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struct sk_buff *rskb;
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void *reply_payload;
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int reply_len;
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int ret;
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ret = ethnl_parse_header_dev_get(&req_info,
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tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
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genl_info_net(info), info->extack,
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true);
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if (ret < 0)
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return ret;
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rtnl_lock();
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ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
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if (ret < 0)
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goto err_unlock_rtnl;
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reply_len = ret + ethnl_reply_header_size();
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rskb = ethnl_reply_init(reply_len, req_info.dev,
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ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY,
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ETHTOOL_A_TUNNEL_INFO_HEADER,
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info, &reply_payload);
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if (!rskb) {
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ret = -ENOMEM;
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goto err_unlock_rtnl;
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}
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ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
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if (ret)
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goto err_free_msg;
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rtnl_unlock();
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dev_put(req_info.dev);
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genlmsg_end(rskb, reply_payload);
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return genlmsg_reply(rskb, info);
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err_free_msg:
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nlmsg_free(rskb);
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err_unlock_rtnl:
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rtnl_unlock();
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dev_put(req_info.dev);
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return ret;
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}
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struct ethnl_tunnel_info_dump_ctx {
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struct ethnl_req_info req_info;
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int pos_hash;
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int pos_idx;
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};
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int ethnl_tunnel_info_start(struct netlink_callback *cb)
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{
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const struct genl_dumpit_info *info = genl_dumpit_info(cb);
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struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
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struct nlattr **tb = info->attrs;
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int ret;
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BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
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memset(ctx, 0, sizeof(*ctx));
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ret = ethnl_parse_header_dev_get(&ctx->req_info,
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tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
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sock_net(cb->skb->sk), cb->extack,
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false);
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if (ctx->req_info.dev) {
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dev_put(ctx->req_info.dev);
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ctx->req_info.dev = NULL;
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}
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return ret;
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}
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int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
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{
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struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
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struct net *net = sock_net(skb->sk);
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int s_idx = ctx->pos_idx;
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int h, idx = 0;
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int ret = 0;
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void *ehdr;
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rtnl_lock();
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cb->seq = net->dev_base_seq;
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for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
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struct hlist_head *head;
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struct net_device *dev;
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head = &net->dev_index_head[h];
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idx = 0;
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hlist_for_each_entry(dev, head, index_hlist) {
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if (idx < s_idx)
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goto cont;
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ehdr = ethnl_dump_put(skb, cb,
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ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
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if (!ehdr) {
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ret = -EMSGSIZE;
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goto out;
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}
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ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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goto out;
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}
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ctx->req_info.dev = dev;
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ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
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ctx->req_info.dev = NULL;
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if (ret < 0) {
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genlmsg_cancel(skb, ehdr);
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if (ret == -EOPNOTSUPP)
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goto cont;
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goto out;
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}
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genlmsg_end(skb, ehdr);
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cont:
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idx++;
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}
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}
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out:
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rtnl_unlock();
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ctx->pos_hash = h;
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ctx->pos_idx = idx;
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nl_dump_check_consistent(cb, nlmsg_hdr(skb));
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if (ret == -EMSGSIZE && skb->len)
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return skb->len;
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return ret;
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}
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