net/ceph/decode.c

   1 // SPDX-License-Identifier: GPL-2.0
   2
   3 #include <linux/ceph/decode.h>
   4
   5 static int
   6 ceph_decode_entity_addr_versioned(void **p, void *end,
   7                                   struct ceph_entity_addr *addr)
   8 {
   9         int ret;
  10         u8 struct_v;
  11         u32 struct_len, addr_len;
  12         void *struct_end;
  13
  14         ret = ceph_start_decoding(p, end, 1, "entity_addr_t", &struct_v,
  15                                   &struct_len);
  16         if (ret)
  17                 goto bad;
  18
  19         ret = -EINVAL;
  20         struct_end = *p + struct_len;
  21
  22         ceph_decode_copy_safe(p, end, &addr->type, sizeof(addr->type), bad);
  23
  24         ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
  25
  26         ceph_decode_32_safe(p, end, addr_len, bad);
  27         if (addr_len > sizeof(addr->in_addr))
  28                 goto bad;
  29
  30         memset(&addr->in_addr, 0, sizeof(addr->in_addr));
  31         if (addr_len) {
  32                 ceph_decode_copy_safe(p, end, &addr->in_addr, addr_len, bad);
  33
  34                 addr->in_addr.ss_family =
  35                         le16_to_cpu((__force __le16)addr->in_addr.ss_family);
  36         }
  37
  38         /* Advance past anything the client doesn't yet understand */
  39         *p = struct_end;
  40         ret = 0;
  41 bad:
  42         return ret;
  43 }
  44
  45 static int
  46 ceph_decode_entity_addr_legacy(void **p, void *end,
  47                                struct ceph_entity_addr *addr)
  48 {
  49         int ret = -EINVAL;
  50
  51         /* Skip rest of type field */
  52         ceph_decode_skip_n(p, end, 3, bad);
  53
  54         /*
  55          * Clients that don't support ADDR2 always send TYPE_NONE, change it
  56          * to TYPE_LEGACY for forward compatibility.
  57          */
  58         addr->type = CEPH_ENTITY_ADDR_TYPE_LEGACY;
  59         ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
  60         memset(&addr->in_addr, 0, sizeof(addr->in_addr));
  61         ceph_decode_copy_safe(p, end, &addr->in_addr,
  62                               sizeof(addr->in_addr), bad);
  63         addr->in_addr.ss_family =
  64                         be16_to_cpu((__force __be16)addr->in_addr.ss_family);
  65         ret = 0;
  66 bad:
  67         return ret;
  68 }
  69
  70 int
  71 ceph_decode_entity_addr(void **p, void *end, struct ceph_entity_addr *addr)
  72 {
  73         u8 marker;
  74
  75         ceph_decode_8_safe(p, end, marker, bad);
  76         if (marker == 1)
  77                 return ceph_decode_entity_addr_versioned(p, end, addr);
  78         else if (marker == 0)
  79                 return ceph_decode_entity_addr_legacy(p, end, addr);
  80 bad:
  81         return -EINVAL;
  82 }
  83 EXPORT_SYMBOL(ceph_decode_entity_addr);
  84