Also add description for struct in6_ifreq which is used for IPv6 addresses. SIOCSIFADDR and SIOCDIFADDR can be used to add or delete IPv6 address and pppd is using these ioctls for a long time. Surprisingly SIOCDIFADDR cannot be used for deleting IPv4 address but only for IPv6 addresses. Signed-off-by: Pali Rohár <pali@xxxxxxxxxx> --- man7/netdevice.7 | 50 +++++++++++++++++++++++++++++++++++++++++------- 1 file changed, 43 insertions(+), 7 deletions(-) diff --git a/man7/netdevice.7 b/man7/netdevice.7 index 488e83d9a..12f94bfd7 100644 --- a/man7/netdevice.7 +++ b/man7/netdevice.7 @@ -55,9 +55,26 @@ struct ifreq { .EE .in .PP +AF_INET6 is an exception. +It passes an +.I in6_ifreq +structure: +.PP +.in +4n +.EX +struct in6_ifreq { + struct in6_addr ifr6_addr; + u32 ifr6_prefixlen; + int ifr6_ifindex; /* Interface index */ +}; +.EE +.in +.PP Normally, the user specifies which device to affect by setting .I ifr_name -to the name of the interface. +to the name of the interface or +.I ifr6_ifindex +to the index of the interface. All other members of the structure may share memory. .SS Ioctls @@ -142,13 +159,32 @@ IFF_ISATAP:Interface is RFC4214 ISATAP interface. .PP Setting the extended (private) interface flags is a privileged operation. .TP -.BR SIOCGIFADDR ", " SIOCSIFADDR -Get or set the address of the device using -.IR ifr_addr . -Setting the interface address is a privileged operation. -For compatibility, only +.BR SIOCGIFADDR ", " SIOCSIFADDR ", " SIOCDIFADDR +Get, set or delete the address of the device using +.IR ifr_addr , +or +.I ifr6_addr +with +.IR ifr6_prefixlen . +Setting or deleting the interface address is a privileged operation. +For compatibility, +.B SIOCGIFADDR +returns only .B AF_INET -addresses are accepted or returned. +addresses, +.B SIOCSIFADDR +accepts +.B AF_INET +and +.B AF_INET6 +addresses and +.B SIOCDIFADDR +deletes only +.B AF_INET6 +addresses. +.B AF_INET +address can be deleted by setting zero address via +.BR SIOCSIFADDR . .TP .BR SIOCGIFDSTADDR ", " SIOCSIFDSTADDR Get or set the destination address of a point-to-point device using -- 2.20.1