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linux-user: netlink: Add emulation of IP_MULTICAST_IF

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Add IP_MULTICAST_IF and share the code with IP_ADD_MEMBERSHIP / IP_DROP_MEMBERSHIP.
Sharing the code makes sense, because the manpage of ip(7) says:

IP_MULTICAST_IF (since Linux 1.2)
      Set the local device for a multicast socket.  The argument
      for setsockopt(2) is an ip_mreqn or (since Linux 3.5)
      ip_mreq structure similar to IP_ADD_MEMBERSHIP, or an
      in_addr structure.  (The kernel determines which structure
      is being passed based on the size passed in optlen.)  For
      getsockopt(2), the argument is an in_addr structure.

Signed-off-by: Helge Deller <deller@gmx.de>
Reviewed-by: Laurent Vivier <laurent@vivier.eu>
This commit is contained in:
Helge Deller 2025-01-19 05:26:10 +01:00
parent 017fc6620f
commit f65464ce6d
1 changed files with 14 additions and 6 deletions
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20
linux-user/syscall.c
View file

@ -2130,16 +2130,23 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
}
ret = get_errno(setsockopt(sockfd, level, optname, &val, sizeof(val)));
break;
case IP_MULTICAST_IF:
case IP_ADD_MEMBERSHIP:
case IP_DROP_MEMBERSHIP:
{
struct ip_mreqn ip_mreq;
struct target_ip_mreqn *target_smreqn;
int min_size;
QEMU_BUILD_BUG_ON(sizeof(struct ip_mreq) !=
sizeof(struct target_ip_mreq));
if (optlen < sizeof (struct target_ip_mreq) ||
if (optname == IP_MULTICAST_IF) {
min_size = sizeof(struct in_addr);
} else {
min_size = sizeof(struct target_ip_mreq);
}
if (optlen < min_size ||
optlen > sizeof (struct target_ip_mreqn)) {
return -TARGET_EINVAL;
}
@ -2149,13 +2156,14 @@ static abi_long do_setsockopt(int sockfd, int level, int optname,
return -TARGET_EFAULT;
}
ip_mreq.imr_multiaddr.s_addr = target_smreqn->imr_multiaddr.s_addr;
ip_mreq.imr_address.s_addr = target_smreqn->imr_address.s_addr;
if (optlen == sizeof(struct target_ip_mreqn)) {
ip_mreq.imr_ifindex = tswapal(target_smreqn->imr_ifindex);
optlen = sizeof(struct ip_mreqn);
if (optlen >= sizeof(struct target_ip_mreq)) {
ip_mreq.imr_address.s_addr = target_smreqn->imr_address.s_addr;
if (optlen >= sizeof(struct target_ip_mreqn)) {
__put_user(target_smreqn->imr_ifindex, &ip_mreq.imr_ifindex);
optlen = sizeof(struct ip_mreqn);
}
}
unlock_user(target_smreqn, optval_addr, 0);
ret = get_errno(setsockopt(sockfd, level, optname, &ip_mreq, optlen));
break;
}