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linux-user: handle netlink flag NLA_F_NESTED

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Newer kernel versions require this flag to be present contrary to older
ones. Depending on the libnl version it is added or not.

Typically when using rtnl_link_inet6_set_addr_gen_mode, the netlink
packet generated may contain the following attribute:

with libnl 3.4

  {nla_len=16, nla_type=IFLA_AF_SPEC},
  [
    {nla_len=12, nla_type=AF_INET6},
    [{nla_len=5, nla_type=IFLA_INET6_ADDR_GEN_MODE}, IN6_ADDR_GEN_MODE_NONE]
  ]

with libnl 3.7

  {nla_len=16, nla_type=NLA_F_NESTED|IFLA_AF_SPEC},
  [
    {nla_len=12, nla_type=NLA_F_NESTED|AF_INET6},
    [{nla_len=5, nla_type=IFLA_INET6_ADDR_GEN_MODE}, IN6_ADDR_GEN_MODE_NONE]]
  ]

Masking the type is likely needed in other places. Only the above cases
are implemented in this patch.

Signed-off-by: Mathis Marion <mathis.marion@silabs.com>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
Message-Id: <20230307154256.101528-3-Mathis.Marion@silabs.com>
Signed-off-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Mathis Marion 2023-03-07 16:42:56 +01:00 committed by Laurent Vivier
parent 44cf6731d6
commit 2fe8ed6fe9
1 changed files with 2 additions and 2 deletions
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4
linux-user/fd-trans.c
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@ -1359,7 +1359,7 @@ static abi_long target_to_host_for_each_rtattr(struct rtattr *rtattr,
static abi_long target_to_host_data_spec_nlattr(struct nlattr *nlattr) static abi_long target_to_host_data_spec_nlattr(struct nlattr *nlattr)
{ {
switch (nlattr->nla_type) { switch (nlattr->nla_type & NLA_TYPE_MASK) {
case AF_INET6: case AF_INET6:
return target_to_host_for_each_nlattr(NLA_DATA(nlattr), nlattr->nla_len, return target_to_host_for_each_nlattr(NLA_DATA(nlattr), nlattr->nla_len,
target_to_host_data_inet6_nlattr); target_to_host_data_inet6_nlattr);
@ -1375,7 +1375,7 @@ static abi_long target_to_host_data_link_rtattr(struct rtattr *rtattr)
{ {
uint32_t *u32; uint32_t *u32;
switch (rtattr->rta_type) { switch (rtattr->rta_type & NLA_TYPE_MASK) {
/* uint32_t */ /* uint32_t */
case QEMU_IFLA_MTU: case QEMU_IFLA_MTU:
case QEMU_IFLA_TXQLEN: case QEMU_IFLA_TXQLEN: