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
 140                 if (nla_put_be16(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_PORT,
 141                                  htons(IANA_VXLAN_UDP_PORT)) ||
 142                     nla_put_u32(skb, ETHTOOL_A_TUNNEL_UDP_ENTRY_TYPE,
 143                                 ilog2(UDP_TUNNEL_TYPE_VXLAN)))
 144                         goto err_cancel_entry;
 145
 146                 nla_nest_end(skb, entry);
 147                 nla_nest_end(skb, table);
 148         }
 149
 150         nla_nest_end(skb, ports);
 151
 152         return 0;
 153
 154 err_cancel_entry:
 155         nla_nest_cancel(skb, entry);
 156 err_cancel_table:
 157         nla_nest_cancel(skb, table);
 158 err_cancel_ports:
 159         nla_nest_cancel(skb, ports);
 160         return -EMSGSIZE;
 161 }
 162
 163 int ethnl_tunnel_info_doit(struct sk_buff *skb, struct genl_info *info)
 164 {
 165         struct ethnl_req_info req_info = {};
 166         struct nlattr **tb = info->attrs;
 167         struct sk_buff *rskb;
 168         void *reply_payload;
 169         int reply_len;
 170         int ret;
 171
 172         ret = ethnl_parse_header_dev_get(&req_info,
 173                                          tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
 174                                          genl_info_net(info), info->extack,
 175                                          true);
 176         if (ret < 0)
 177                 return ret;
 178
 179         rtnl_lock();
 180         ret = ethnl_tunnel_info_reply_size(&req_info, info->extack);
 181         if (ret < 0)
 182                 goto err_unlock_rtnl;
 183         reply_len = ret + ethnl_reply_header_size();
 184
 185         rskb = ethnl_reply_init(reply_len, req_info.dev,
 186                                 ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY,
 187                                 ETHTOOL_A_TUNNEL_INFO_HEADER,
 188                                 info, &reply_payload);
 189         if (!rskb) {
 190                 ret = -ENOMEM;
 191                 goto err_unlock_rtnl;
 192         }
 193
 194         ret = ethnl_tunnel_info_fill_reply(&req_info, rskb);
 195         if (ret)
 196                 goto err_free_msg;
 197         rtnl_unlock();
 198         dev_put(req_info.dev);
 199         genlmsg_end(rskb, reply_payload);
 200
 201         return genlmsg_reply(rskb, info);
 202
 203 err_free_msg:
 204         nlmsg_free(rskb);
 205 err_unlock_rtnl:
 206         rtnl_unlock();
 207         dev_put(req_info.dev);
 208         return ret;
 209 }
 210
 211 struct ethnl_tunnel_info_dump_ctx {
 212         struct ethnl_req_info   req_info;
 213         int                     pos_hash;
 214         int                     pos_idx;
 215 };
 216
 217 int ethnl_tunnel_info_start(struct netlink_callback *cb)
 218 {
 219         const struct genl_dumpit_info *info = genl_dumpit_info(cb);
 220         struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
 221         struct nlattr **tb = info->attrs;
 222         int ret;
 223
 224         BUILD_BUG_ON(sizeof(*ctx) > sizeof(cb->ctx));
 225
 226         memset(ctx, 0, sizeof(*ctx));
 227
 228         ret = ethnl_parse_header_dev_get(&ctx->req_info,
 229                                          tb[ETHTOOL_A_TUNNEL_INFO_HEADER],
 230                                          sock_net(cb->skb->sk), cb->extack,
 231                                          false);
 232         if (ctx->req_info.dev) {
 233                 dev_put(ctx->req_info.dev);
 234                 ctx->req_info.dev = NULL;
 235         }
 236
 237         return ret;
 238 }
 239
 240 int ethnl_tunnel_info_dumpit(struct sk_buff *skb, struct netlink_callback *cb)
 241 {
 242         struct ethnl_tunnel_info_dump_ctx *ctx = (void *)cb->ctx;
 243         struct net *net = sock_net(skb->sk);
 244         int s_idx = ctx->pos_idx;
 245         int h, idx = 0;
 246         int ret = 0;
 247         void *ehdr;
 248
 249         rtnl_lock();
 250         cb->seq = net->dev_base_seq;
 251         for (h = ctx->pos_hash; h < NETDEV_HASHENTRIES; h++, s_idx = 0) {
 252                 struct hlist_head *head;
 253                 struct net_device *dev;
 254
 255                 head = &net->dev_index_head[h];
 256                 idx = 0;
 257                 hlist_for_each_entry(dev, head, index_hlist) {
 258                         if (idx < s_idx)
 259                                 goto cont;
 260
 261                         ehdr = ethnl_dump_put(skb, cb,
 262                                               ETHTOOL_MSG_TUNNEL_INFO_GET_REPLY);
 263                         if (!ehdr) {
 264                                 ret = -EMSGSIZE;
 265                                 goto out;
 266                         }
 267
 268                         ret = ethnl_fill_reply_header(skb, dev, ETHTOOL_A_TUNNEL_INFO_HEADER);
 269                         if (ret < 0) {
 270                                 genlmsg_cancel(skb, ehdr);
 271                                 goto out;
 272                         }
 273
 274                         ctx->req_info.dev = dev;
 275                         ret = ethnl_tunnel_info_fill_reply(&ctx->req_info, skb);
 276                         ctx->req_info.dev = NULL;
 277                         if (ret < 0) {
 278                                 genlmsg_cancel(skb, ehdr);
 279                                 if (ret == -EOPNOTSUPP)
 280                                         goto cont;
 281                                 goto out;
 282                         }
 283                         genlmsg_end(skb, ehdr);
 284 cont:
 285                         idx++;
 286                 }
 287         }
 288 out:
 289         rtnl_unlock();
 290
 291         ctx->pos_hash = h;
 292         ctx->pos_idx = idx;
 293         nl_dump_check_consistent(cb, nlmsg_hdr(skb));
 294
 295         if (ret == -EMSGSIZE && skb->len)
 296                 return skb->len;
 297         return ret;
 298 }