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This commit brings in a fragmentary, experimental implementation of N…
…ETLINK sockets. There is not too much to that socket support on this initial commit, just the netlink socketer framework. However, I decided to bring it into master because there is a enough that I would not want to lose what is in place. And since it is dependent on CONFIG_EXPERIMENATL, its presence on master should be innocuous.
Squashed commit of the following:
net/netlink: Mark netlink support as EXPERIMENTAL.
net/netlink/netlink_sockif.c: Add netlink_getpeername to the socket interface.
net: Add getpeeername() support for netlink sockets.
include/netpacket/netlink.h: Add a few more definitions and structures used at the NetLink interface. Still missing many.
net/netlink: Add basic framework for Netlink socket support.
include/: Add basic Netlink definitions.- Loading branch information
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| /**************************************************************************** | ||
| * include/netpacket/netlink.h | ||
| * | ||
| * Copyright (C) 2018 Gregory Nutt. All rights reserved. | ||
| * Author: Gregory Nutt <gnutt@nuttx.org> | ||
| * | ||
| * Redistribution and use in source and binary forms, with or without | ||
| * modification, are permitted provided that the following conditions | ||
| * are met: | ||
| * | ||
| * 1. Redistributions of source code must retain the above copyright | ||
| * notice, this list of conditions and the following disclaimer. | ||
| * 2. Redistributions in binary form must reproduce the above copyright | ||
| * notice, this list of conditions and the following disclaimer in | ||
| * the documentation and/or other materials provided with the | ||
| * distribution. | ||
| * 3. Neither the name NuttX nor the names of its contributors may be | ||
| * used to endorse or promote products derived from this software | ||
| * without specific prior written permission. | ||
| * | ||
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS | ||
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT | ||
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS | ||
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE | ||
| * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, | ||
| * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, | ||
| * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS | ||
| * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED | ||
| * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | ||
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN | ||
| * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE | ||
| * POSSIBILITY OF SUCH DAMAGE. | ||
| * | ||
| ****************************************************************************/ | ||
|
|
||
| #ifndef __INCLUDE_NETPACKET_NETLINK_H | ||
| #define __INCLUDE_NETPACKET_NETLINK_H | ||
|
|
||
| /**************************************************************************** | ||
| * Included Files | ||
| ****************************************************************************/ | ||
|
|
||
| #include <sys/socket.h> | ||
| #include <stdint.h> | ||
|
|
||
| /**************************************************************************** | ||
| * Pre-processor Definitions | ||
| ****************************************************************************/ | ||
|
|
||
| /* Netlink socket protocols *************************************************/ | ||
| /* The AF_NETLINK family offers multiple protocol subsets. Each interfaces | ||
| * to a different kernel component and has a different messaging subset. The | ||
| * subset is referenced by the protocol field in the socket call: | ||
| * | ||
| * int socket(AF_NETLINK, SOCK_DGRAM or SOCK_RAW, protocol) | ||
| * | ||
| * Ref. Wikipedia.org | ||
| */ | ||
|
|
||
| #define NETLINK_ROUTE 0 /* Routing/device hook for user-space | ||
| * routing daemons */ | ||
| #define NETLINK_FIREWALL 1 /* Interface to receive packets from | ||
| * the firewall */ | ||
| #define NETLINK_NFLOG 2 /* netfilter/iptables ULOG */ | ||
| #define NETLINK_ARPD 3 /* Interface to manage the ARP table */ | ||
| #define NETLINK_AUDIT 4 /* Interface to auditing sub-system */ | ||
| #define NETLINK_IP6_FW 5 /* Interface to transport packets from | ||
| * netfilter to user-space. */ | ||
| #define NETLINK_ROUTE6 6 | ||
| #define NETLINK_TAPBASE 7 | ||
| #define NETLINK_NETFILTER 8 | ||
| #define NETLINK_TCPDIAG 9 | ||
| #define NETLINK_XFRM 10 /* Interface to IPsec security databases | ||
| * for key-manager daemons using the Internet | ||
| * Key Exchange protocol. */ | ||
| #define NETLINK_USERSOCK 11 /* Reserved for user mode socket protocols */ | ||
|
|
||
| /* NETLINK_ROUTE protocol message types *************************************/ | ||
| /* Link layer: | ||
| * | ||
| * RTM_NEWLINK, RTM_DELLINK, RTM_GETLINK | ||
| * Create, remove or get information about a specific network interface. | ||
| * These messages contain an ifinfomsg structure followed by a series | ||
| * of rtattr structures. | ||
| */ | ||
|
|
||
| #define RTM_NEWLINK 0 | ||
| #define RTM_DELLINK 1 | ||
| #define RTM_GETLINK 2 | ||
| #define RTM_SETLINK 3 | ||
|
|
||
| /* Address settings: | ||
| * | ||
| * RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR | ||
| * Add, remove or receive information about an IP address associated with | ||
| * an interface. These messages contain an ifaddrmsg structure, optionally | ||
| * followed by rtattr routing attributes. | ||
| */ | ||
|
|
||
| #define RTM_NEWADDR 4 | ||
| #define RTM_DELADDR 5 | ||
| #define RTM_GETADDR 6 | ||
|
|
||
| /* Routing tables: | ||
| * | ||
| * RTM_NEWROUTE, RTM_DELROUTE, RTM_GETROUTE | ||
| * Create, remove or receive information about a network route. These | ||
| * messages contain an rtmsg structure with an optional sequence of | ||
| * rtattr structures following. | ||
| * | ||
| * For RTM_GETROUTE, setting rtm_dst_len and rtm_src_len to 0 means you | ||
| * get all entries for the specified routing table. For the other fields, | ||
| * except rtm_table and rtm_protocol, 0 is the wildcard. | ||
| */ | ||
|
|
||
| #define RTM_NEWROUTE 7 | ||
| #define RTM_DELROUTE 8 | ||
| #define RTM_GETROUTE 9 | ||
|
|
||
| /* Neighbor cache: | ||
| * | ||
| * RTM_NEWNEIGH, RTM_DELNEIGH, RTM_GETNEIGH | ||
| * Add, remove or receive information about a neighbor table entry (e.g., | ||
| * an ARP entry). The message contains an ndmsg structure. | ||
| */ | ||
|
|
||
| #define RTM_NEWNEIGH 10 | ||
| #define RTM_DELNEIGH 11 | ||
| #define RTM_GETNEIGH 12 | ||
|
|
||
| /* Routing rules: | ||
| * | ||
| * RTM_NEWRULE, RTM_DELRULE, RTM_GETRULE | ||
| * Add, delete or retrieve a routing rule. Carries a struct rtmsg | ||
| */ | ||
|
|
||
| #define RTM_NEWRULE 13 | ||
| #define RTM_DELRULE 14 | ||
| #define RTM_GETRULE 15 | ||
|
|
||
| /* Queuing discipline settings: | ||
| * | ||
| * RTM_NEWQDISC, RTM_DELQDISC, RTM_GETQDISC | ||
| * Add, remove or get a queuing discipline. The message contains a | ||
| * struct tcmsg and may be followed by a series of attributes. | ||
| */ | ||
|
|
||
| #define RTM_NEWQDISC 16 | ||
| #define RTM_DELQDISC 17 | ||
| #define RTM_GETQDISC 18 | ||
|
|
||
| /* Traffic classes used with queues: | ||
| * | ||
| * RTM_NEWTCLASS, RTM_DELTCLASS, RTM_GETTCLASS | ||
| * Add, remove or get a traffic class. These messages contain a struct | ||
| * tcmsg as described above. | ||
| */ | ||
|
|
||
| #define RTM_NEWTCLASS 19 | ||
| #define RTM_DELTCLASS 20 | ||
| #define RTM_GETTCLASS 21 | ||
|
|
||
| /* Traffic filters: | ||
| * | ||
| * RTM_NEWTFILTER, RTM_DELTFILTER, RTM_GETTFILTER | ||
| * Add, remove or receive information about a traffic filter. These | ||
| * messages contain a struct tcmsg as described above. | ||
| */ | ||
|
|
||
| #define RTM_NEWTFILTER 22 | ||
| #define RTM_DELTFILTER 23 | ||
| #define RTM_GETTFILTER 24 | ||
|
|
||
| /* Others: */ | ||
|
|
||
| #define RTM_NEWACTION 25 | ||
| #define RTM_DELACTION 26 | ||
| #define RTM_GETACTION 27 | ||
| #define RTM_NEWPREFIX 28 | ||
| #define RTM_GETPREFIX 29 | ||
| #define RTM_GETMULTICAST 30 | ||
| #define RTM_GETANYCAST 31 | ||
| #define RTM_NEWNEIGHTBL 32 | ||
| #define RTM_GETNEIGHTBL 33 | ||
| #define RTM_SETNEIGHTBL 34 | ||
|
|
||
| /* Definitions associated with struct sockaddr_nl ***************************/ | ||
| /* Flags values */ | ||
|
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||
| #define NLM_F_REQUEST 0x0001 /* It is request message. */ | ||
| #define NLM_F_MULTI 0x0002 /* Multipart message, terminated by NLMSG_DONE */ | ||
| #define NLM_F_ACK 0x0004 /* Reply with ack, with zero or error code */ | ||
| #define NLM_F_ECHO 0x0008 /* Echo this request */ | ||
| #define NLM_F_DUMP_INTR 0x0010 /* Dump was inconsistent due to sequence change */ | ||
| #define NLM_F_DUMP_FILTERED 0x0020 /* Dump was filtered as requested */ | ||
|
|
||
| /* Modifiers to GET request */ | ||
|
|
||
| #define NLM_F_ROOT 0x0100 /* specify tree root */ | ||
| #define NLM_F_MATCH 0x0200 /* return all matching */ | ||
| #define NLM_F_ATOMIC 0x0400 /* atomic GET */ | ||
| #define NLM_F_DUMP (NLM_F_ROOT|NLM_F_MATCH) | ||
|
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| /* Modifiers to NEW request */ | ||
|
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||
| #define NLM_F_REPLACE 0x0100 /* Override existing */ | ||
| #define NLM_F_EXCL 0x0200 /* Do not touch, if it exists */ | ||
| #define NLM_F_CREATE 0x0400 /* Create, if it does not exist */ | ||
| #define NLM_F_APPEND 0x0800 /* Add to end of list */ | ||
|
|
||
| /* Modifiers to DELETE request */ | ||
|
|
||
| #define NLM_F_NONREC 0x0100 /* Do not delete recursively */ | ||
|
|
||
| /* Flags for ACK message */ | ||
|
|
||
| #define NLM_F_CAPPED 0x0100 /* request was capped */ | ||
| #define NLM_F_ACK_TLVS 0x0200 /* extended ACK TVLs were included */ | ||
|
|
||
| /* Definitions for struct rtattr ********************************************/ | ||
| /* Macros to handle rtattributes */ | ||
|
|
||
| #define RTA_ALIGNTO 4 | ||
| #define RTA_ALIGN(len) (((len)+RTA_ALIGNTO-1) & ~(RTA_ALIGNTO-1)) | ||
| #define RTA_OK(rta,len) \ | ||
| ((len) >= (int)sizeof(struct rtattr) && \ | ||
| (rta)->rta_len >= sizeof(struct rtattr) && \ | ||
| (rta)->rta_len <= (len)) | ||
| #define RTA_NEXT(rta,attrlen) \ | ||
| ((attrlen) -= RTA_ALIGN((rta)->rta_len), \ | ||
| (struct rtattr*)(((char*)(rta)) + RTA_ALIGN((rta)->rta_len))) | ||
| #define RTA_LENGTH(len) (RTA_ALIGN(sizeof(struct rtattr)) + (len)) | ||
| #define RTA_SPACE(len) RTA_ALIGN(RTA_LENGTH(len)) | ||
| #define RTA_DATA(rta) ((FAR void *)(((FAR char *)(rta)) + RTA_LENGTH(0))) | ||
| #define RTA_PAYLOAD(rta) ((int)((rta)->rta_len) - RTA_LENGTH(0)) | ||
|
|
||
| /* Definitions for struct ifaddrmsg ****************************************/ | ||
| /* ifa_flags definitions: ifa_flags is a flag word of IFA_F_SECONDARY for | ||
| * secondary address (old alias interface), IFA_F_PERMANENT for a permanent | ||
| * address set by the user and other undocumented flags. | ||
| */ | ||
|
|
||
| #define IFA_F_SECONDARY 0x01 | ||
| #define IFA_F_PERMANENT 0x02 | ||
|
|
||
| /**************************************************************************** | ||
| * Public Type Definitions | ||
| ****************************************************************************/ | ||
|
|
||
| /* Netlink socket address type. */ | ||
|
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||
| struct sockaddr_nl | ||
| { | ||
| sa_family_t nl_family; /* AF_NETLINK */ | ||
| uint16_t nl_pad; /* Zero */ | ||
| uint32_t nl_pid; /* Port ID */ | ||
| uint32_t nl_groups; /* Multicast groups mask */ | ||
| }; | ||
|
|
||
| /* Packet structure. The Netlink message header, struct nlmsghdr, must be | ||
| * prepared by the caller. The Netlink socket generally works in a SOCK_RAW- | ||
| * like mode (even if SOCK_DGRAM was used to create it). | ||
| * | ||
| * The data portion then contains a subsystem-specific message that may be | ||
| * further nested. | ||
| */ | ||
|
|
||
| struct nlmsghdr | ||
| { | ||
| uint32_t nlmsg_len; /* Length of message including header */ | ||
| uint16_t nlmsg_type; /* Message content */ | ||
| uint16_t nlmsg_flags; /* Additional flags */ | ||
| uint32_t nlmsg_seq; /* Sequence number */ | ||
| uint32_t nlmsg_pid; /* Sending process port ID */ | ||
| /* Data follows */ | ||
| }; | ||
|
|
||
| /* RTM_NEWLINK, RTM_DELLINK, RTM_GETLINK | ||
| * | ||
| * Create, remove or get information about a specific network interface. | ||
| * These messages contain an ifinfomsg structure followed by a series | ||
| * of rtattr structures. | ||
| * | ||
| * These attributes should be manipulated using only the RTA_* | ||
| */ | ||
|
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||
| struct rtattr | ||
| { | ||
| uint16_t rta_len; /* Length of option */ | ||
| uint16_t rta_type; /* Type of option */ | ||
| /* Data follows */ | ||
| }; | ||
|
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||
| struct ifinfomsg | ||
| { | ||
| uint8_t ifi_family; /* AF_UNSPEC */ | ||
| uint16_t ifi_type; /* Device type */ | ||
| int16_t ifi_index; /* Unique interface index */ | ||
| uint32_t ifi_flags; /* Device flags */ | ||
| uint32_t ifi_change; /* Change mask, must always be 0xffffffff */ | ||
| }; | ||
|
|
||
| /* RTM_NEWADDR, RTM_DELADDR, RTM_GETADDR | ||
| * | ||
| * Add, remove or receive information about an IP address associated with | ||
| * an interface. These messages contain an ifaddrmsg structure, optionally | ||
| * followed by rtattr routing attributes. | ||
| */ | ||
|
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| struct ifaddrmsg | ||
| { | ||
| uint8_t ifa_family; /* Address type: AF_INET or AF_INET6 */ | ||
| uint8_t ifa_prefixlen; /* Prefix length of address */ | ||
| uint8_t ifa_flags; /* Address flags. See IFA_F_* definitions */ | ||
| uint8_t ifa_scope; /* Address scope */ | ||
| int16_t ifa_index; /* Unique interface index */ | ||
| }; | ||
|
|
||
| /**************************************************************************** | ||
| * Public Function Prototypes | ||
| ****************************************************************************/ | ||
|
|
||
| #endif /* __INCLUDE_NETPACKET_NETLINK_H */ |
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