forked from Minki/linux
6c37f0e641
Add a function for decoding an entity_addr_t. Once CEPH_FEATURE_MSG_ADDR2 is enabled, the server daemons will start encoding entity_addr_t differently. Add a new helper function that can handle either format. Signed-off-by: Jeff Layton <jlayton@kernel.org> Reviewed-by: "Yan, Zheng" <zyan@redhat.com> Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/ceph/decode.h>
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static int
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ceph_decode_entity_addr_versioned(void **p, void *end,
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struct ceph_entity_addr *addr)
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{
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int ret;
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u8 struct_v;
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u32 struct_len, addr_len;
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void *struct_end;
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ret = ceph_start_decoding(p, end, 1, "entity_addr_t", &struct_v,
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&struct_len);
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if (ret)
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goto bad;
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ret = -EINVAL;
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struct_end = *p + struct_len;
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ceph_decode_copy_safe(p, end, &addr->type, sizeof(addr->type), bad);
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/*
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* TYPE_NONE == 0
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* TYPE_LEGACY == 1
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*
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* Clients that don't support ADDR2 always send TYPE_NONE.
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* For now, since all we support is msgr1, just set this to 0
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* when we get a TYPE_LEGACY type.
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*/
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if (addr->type == cpu_to_le32(1))
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addr->type = 0;
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ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
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ceph_decode_32_safe(p, end, addr_len, bad);
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if (addr_len > sizeof(addr->in_addr))
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goto bad;
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memset(&addr->in_addr, 0, sizeof(addr->in_addr));
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if (addr_len) {
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ceph_decode_copy_safe(p, end, &addr->in_addr, addr_len, bad);
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addr->in_addr.ss_family =
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le16_to_cpu((__force __le16)addr->in_addr.ss_family);
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}
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/* Advance past anything the client doesn't yet understand */
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*p = struct_end;
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ret = 0;
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bad:
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return ret;
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}
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static int
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ceph_decode_entity_addr_legacy(void **p, void *end,
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struct ceph_entity_addr *addr)
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{
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int ret = -EINVAL;
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/* Skip rest of type field */
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ceph_decode_skip_n(p, end, 3, bad);
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addr->type = 0;
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ceph_decode_copy_safe(p, end, &addr->nonce, sizeof(addr->nonce), bad);
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memset(&addr->in_addr, 0, sizeof(addr->in_addr));
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ceph_decode_copy_safe(p, end, &addr->in_addr,
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sizeof(addr->in_addr), bad);
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addr->in_addr.ss_family =
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be16_to_cpu((__force __be16)addr->in_addr.ss_family);
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ret = 0;
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bad:
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return ret;
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}
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int
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ceph_decode_entity_addr(void **p, void *end, struct ceph_entity_addr *addr)
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{
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u8 marker;
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ceph_decode_8_safe(p, end, marker, bad);
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if (marker == 1)
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return ceph_decode_entity_addr_versioned(p, end, addr);
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else if (marker == 0)
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return ceph_decode_entity_addr_legacy(p, end, addr);
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bad:
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return -EINVAL;
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}
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EXPORT_SYMBOL(ceph_decode_entity_addr);
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