NLM_F_DUMP Convenience macro equivalent to (NLM_F_ROOT|NLM_F_MATCH). Note that NLM_F_ATOMIC requires the CAP_NET_ADMIN capability or an effective UID of 0.
NLM_F_DUMP netlink flag dump the networking subsystem database (eg all links) Example message types supported for links [4]: • RTM_NEWLINK to create or set attributes on a link • RTM_DELLINK to delete a link • RIM_GETLINK to get a link or dump the kernel link database when NLM_F_DUMP .
NLM_F_DUMP – Return a list of all objects (NLM_F_ROOT|NLM_F_MATCH). Use of these flags is completely optional and many netlink protocols only make use of the NLM_F_DUMP flag which typically requests the receiver to send a list of all objects in the context of the message type as a sequence of multipart messages (see Multipart Messages ).
NLM_F _DUMP, no device: get device related string sets for all devices. If there is no ETHTOOL_A_STRSET_STRINGSETS array, all string sets of requested type are returned, otherwise only those specified in the request. Flag ETHTOOL_A_STRSET_COUNTS_ONLY tells kernel to only return string counts of the sets, not the actual strings.
3/15/2013 · NLM_F _DUMP: Convenience macro equivalent to (NLM_F_ROOT|NLM_F_MATCH). Note that NLM_F_ATOMIC requires the CAP_NET_ADMIN capability or an effective UID of 0. Additional flag bits for NEW requests: NLM_F_REPLACE: Replace existing matching object. NLM_F_EXCL: Don’t replace if the object already exists.
NLM_F _DUMP If set, all links will be returned in form of a multipart message. Returns: EINVAL if neither interface nor link name are set ENODEV if no link was found ENOBUFS if allocation failed RTM_NEWLINK (user?kernel) Creates a new or updates an existing link. Only virtual links may be created but all links may be updated.
3/24/2019 · Additional flags “NLM_F_REQUEST | NLM_F_DUMP” telling kernel that this is a dump request. As rtm_family we can specify AF_INET if we wanna get the table for IPv4 protocol and AF_INET6 for the IPv6. Getting kernel response is more complex. We need to execute vectored reading using already known recvmsg and struct iovec.
If the nlmsg_flags field of the struct nlmsghdr header has the NLM_F _DUMP flag set, it means that a list of sockets is being requested otherwise it is a query about an individual socket. Response The response starts with a struct nlmsghdr header and is followed by an array of objects specific to the address family.
Nevermind, according to here the kernel will refuse to send messages if there is anything left in the receive buffer and you set NLM_F _DUMP (so no). – kai Apr 16 ’14 at 18:58 1 RTM_GETLINK and RTM_GETADDR are not bit masks, so they cannot be or’ed. – Mario Klebsch Feb 28 ’18 at 9:47, 10/8/2017 · sendto(5, {{len=28, type=RTM_GETRULE, flags=NLM_F_REQUEST|NLM_F_ACK| NLM_F _DUMP, seq=8, pid=0}, {family=AF_UNSPEC, dst_len=0, src_len=0, tos=0, table=RT_TABLE_UNSPEC, action=FR_ACT_TO_TBL, flags=0}}, 28, 0, {sa_family=AF_NETLINK, nl_pid=0, nl_groups=00000000}, 16) = 28 recvmsg(5, …
