net/ethtool/tunnels.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2
   3 #include <linux/ethtool_netlink.h>
   4 #include <net/udp_tunnel.h>
   5 #include <net/vxlan.h>
   6
   7 #include "bitset.h"
   8 #include "common.h"
   9 #include "netlink.h"
  10
  11 const struct nla_policy ethnl_tunnel_info_get_policy[] = {
  12         [ETHTOOL_A_TUNNEL_INFO_HEADER]          =
  13                 NLA_POLICY_NESTED(ethnl_header_policy),
  14 };
  15
  16 static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN == ilog2(UDP_TUNNEL_TYPE_VXLAN));
  17 static_assert(ETHTOOL_UDP_TUNNEL_TYPE_GENEVE == ilog2(UDP_TUNNEL_TYPE_GENEVE));
  18 static_assert(ETHTOOL_UDP_TUNNEL_TYPE_VXLAN_GPE ==
  19               ilog2(UDP_TUNNEL_TYPE_VXLAN_GPE));
  20
  21 static ssize_t ethnl_udp_table_reply_size(unsigned int types, bool compact)
  22 {
  23         ssize_t size;
  24
  25         size = ethnl_bitset32_size(&types, NULL, __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
  26                                    udp_tunnel_type_names, compact);
  27         if (size < 0)
  28                 return size;
  29
  30         return size +
  31                 nla_total_size(0) + /* _UDP_TABLE */
  32                 nla_total_size(sizeof(u32)); /* _UDP_TABLE_SIZE */
  33 }
  34
  35 static ssize_t
  36 ethnl_tunnel_info_reply_size(const struct ethnl_req_info *req_base,
  37                              struct netlink_ext_ack *extack)
  38 {
  39         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  40         const struct udp_tunnel_nic_info *info;
  41         unsigned int i;
  42         ssize_t ret;
  43         size_t size;
  44
  45         info = req_base->dev->udp_tunnel_nic_info;
  46         if (!info) {
  47                 NL_SET_ERR_MSG(extack,
  48                                "device does not report tunnel offload info");
  49                 return -EOPNOTSUPP;
  50         }
  51
  52         size =  nla_total_size(0); /* _INFO_UDP_PORTS */
  53
  54         for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
  55                 if (!info->tables[i].n_entries)
  56                         break;
  57
  58                 ret = ethnl_udp_table_reply_size(info->tables[i].tunnel_types,
  59                                                  compact);
  60                 if (ret < 0)
  61                         return ret;
  62                 size += ret;
  63
  64                 size += udp_tunnel_nic_dump_size(req_base->dev, i);
  65         }
  66
  67         if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
  68                 ret = ethnl_udp_table_reply_size(0, compact);
  69                 if (ret < 0)
  70                         return ret;
  71                 size += ret;
  72
  73                 size += nla_total_size(0) +              /* _TABLE_ENTRY */
  74                         nla_total_size(sizeof(__be16)) + /* _ENTRY_PORT */
  75                         nla_total_size(sizeof(u32));     /* _ENTRY_TYPE */
  76         }
  77
  78         return size;
  79 }
  80
  81 static int
  82 ethnl_tunnel_info_fill_reply(const struct ethnl_req_info *req_base,
  83                              struct sk_buff *skb)
  84 {
  85         bool compact = req_base->flags & ETHTOOL_FLAG_COMPACT_BITSETS;
  86         const struct udp_tunnel_nic_info *info;
  87         struct nlattr *ports, *table, *entry;
  88         unsigned int i;
  89
  90         info = req_base->dev->udp_tunnel_nic_info;
  91         if (!info)
  92                 return -EOPNOTSUPP;
  93
  94         ports = nla_nest_start(skb, ETHTOOL_A_TUNNEL_INFO_UDP_PORTS);
  95         if (!ports)
  96                 return -EMSGSIZE;
  97
  98         for (i = 0; i < UDP_TUNNEL_NIC_MAX_TABLES; i++) {
  99                 if (!info->tables[i].n_entries)
 100                         break;
 101
 102                 table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
 103                 if (!table)
 104                         goto err_cancel_ports;
 105
 106                 if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE,
 107                                 info->tables[i].n_entries))
 108                         goto err_cancel_table;
 109
 110                 if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
 111                                        &info->tables[i].tunnel_types, NULL,
 112                                        __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
 113                                        udp_tunnel_type_names, compact))
 114                         goto err_cancel_table;
 115
 116                 if (udp_tunnel_nic_dump_write(req_base->dev, i, skb))
 117                         goto err_cancel_table;
 118
 119                 nla_nest_end(skb, table);
 120         }
 121
 122         if (info->flags & UDP_TUNNEL_NIC_INFO_STATIC_IANA_VXLAN) {
 123                 u32 zero = 0;
 124
 125                 table = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE);
 126                 if (!table)
 127                         goto err_cancel_ports;
 128
 129                 if (nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_SIZE, 1))
 130                         goto err_cancel_table;
 131
 132                 if (ethnl_put_bitset32(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_TYPES,
 133                                        &zero, NULL,
 134                                        __ETHTOOL_UDP_TUNNEL_TYPE_CNT,
 135                                        udp_tunnel_type_names, compact))
 136                         goto err_cancel_table;
 137
 138                 entry = nla_nest_start(skb, ETHTOOL_A_TUNNEL_UDP_TABLE_ENTRY);
 139                 if (!entry)
 140                         goto err_cancel_entry;
 141
 142                 if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
 143                                  htons(IANA_VXLAN_UDP_PORT)) ||
 144                     nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
 145                                 ilog2(UDP_TUNNEL_TYPE_VXLAN)))
 146                         goto err_cancel_entry;
 147
 148                 nla_nest_end(skb, entry);
 149                 nla_nest_end(skb, table);
 150         }
 151
 152         nla_nest_end(skb, ports);
 153
 154         return 0;
 155
 156 err_cancel_entry:
 157         nla_nest_cancel(skb, entry);
 158 err_cancel_table:
 159         nla_nest_cancel(skb, table);
 160 err_cancel_ports:
 161         nla_nest_cancel(skb, ports);
 162         return -EMSGSIZE;
 163 }
 164
 165 int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
 166 {
 167         struct ethnl_req_info req_info = {};
 168         struct nlattr **tb = info->attrs;
 169         struct sk_buff *rskb;
 170         void *reply_payload;
 171         int reply_len;
 172         int ret;
 173
 174         ret = ethnl_parse_header_dev_get(&req_info,
 175                                          tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
 176                                          genl_info_net(info), info->extack,
 177                                          true);
 178         if (ret < 0)
 179                 return ret;
 180
 181         rtnl_lock();
 182         ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
 183         if (ret < 0)
 184                 goto err_unlock_rtnl;
 185         reply_len = ret + ethnl_reply_header_size();
 186
 187         rskb = ethnl_reply_init(reply_len, req_info.dev,
 188                                 ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY,
 189                                 ETHTOOL_A_TUNNEL_INFO_HEADER,
 190                                 info, &reply_payload);
 191         if (!rskb) {
 192                 ret = -ENOMEM;
 193                 goto err_unlock_rtnl;
 194         }
 195
 196         ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
 197         if (ret)
 198                 goto err_free_msg;
 199         rtnl_unlock();
 200         ethnl_parse_header_dev_put(&req_info);
 201         genlmsg_end(rskb, reply_payload);
 202
 203         return genlmsg_reply(rskb, info);
 204
 205 err_free_msg:
 206         nlmsg_free(rskb);
 207 err_unlock_rtnl:
 208         rtnl_unlock();
 209         ethnl_parse_header_dev_put(&req_info);
 210         return ret;
 211 }
 212
 213 struct ethnl_tunnel_info_dump_ctx {
 214         struct ethnl_req_info   req_info;
 215         unsigned long           ifindex;
 216 };
 217
 218 int ethnl_tunnel_info_start(struct netlink_callback *cb)
 219 {
 220         const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 221         struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
 222         struct nlattr **tb = info->info.attrs;
 223         int ret;
 224
 225         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 226
 227         memset(ctx, 0, sizeof(*ctx));
 228
 229         ret = ethnl_parse_header_dev_get(&ctx->req_info,
 230                                          tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
 231                                          sock_net(cb->skb->sk), cb->extack,
 232                                          false);
 233         if (ctx->req_info.dev) {
 234                 ethnl_parse_header_dev_put(&ctx->req_info);
 235                 ctx->req_info.dev = NULL;
 236         }
 237
 238         return ret;
 239 }
 240
 241 int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 242 {
 243         struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
 244         struct net *net = sock_net(skb->sk);
 245         struct net_device *dev;
 246         int ret = 0;
 247         void *ehdr;
 248
 249         rtnl_lock();
 250         for_each_netdev_dump(net, dev, ctx->ifindex) {
 251                 ehdr = ethnl_dump_put(skb, cb,
 252                                       ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
 253                 if (!ehdr) {
 254                         ret = -EMSGSIZE;
 255                         break;
 256                 }
 257
 258                 ret = ethnl_fill_reply_header(skb, dev,
 259                                               ETHTOOL_A_TUNNEL_INFO_HEADER);
 260                 if (ret < 0) {
 261                         genlmsg_cancel(skb, ehdr);
 262                         break;
 263                 }
 264
 265                 ctx->req_info.dev = dev;
 266                 ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
 267                 ctx->req_info.dev = NULL;
 268                 if (ret < 0) {
 269                         genlmsg_cancel(skb, ehdr);
 270                         if (ret == -EOPNOTSUPP)
 271                                 continue;
 272                         break;
 273                 }
 274                 genlmsg_end(skb, ehdr);
 275         }
 276         rtnl_unlock();
 277
 278         if (ret == -EMSGSIZE && skb->len)
 279                 return skb->len;
 280         return ret;
 281 }