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// SPDX-License-Identifier: GPL-2.0-or-later
/* Router advertisement
* Copyright (C) 1999 Kunihiro Ishiguro
*/
#ifndef _ZEBRA_SOCKOPT_H
#define _ZEBRA_SOCKOPT_H
#include "sockunion.h"
#ifdef __cplusplus
extern "C" {
#endif
extern int setsockopt_so_recvbuf(int sock, int size);
extern int setsockopt_so_sendbuf(const int sock, int size);
extern int getsockopt_so_sendbuf(const int sock);
extern int getsockopt_so_recvbuf(const int sock);
extern int setsockopt_ipv6_pktinfo(int, int);
extern int setsockopt_ipv6_multicast_hops(int, int);
extern int setsockopt_ipv6_unicast_hops(int, int);
extern int setsockopt_ipv6_hoplimit(int, int);
extern int setsockopt_ipv6_multicast_loop(int, int);
extern int setsockopt_ipv6_tclass(int, int);
#define SOPT_SIZE_CMSG_PKTINFO_IPV6() (sizeof(struct in6_pktinfo));
/*
* Size defines for control messages used to get ifindex. We define
* values for each method, and define a macro that can be used by code
* that is unaware of which method is in use.
* These values are without any alignment needed (see CMSG_SPACE in RFC3542).
*/
#if defined(IP_PKTINFO)
/* Linux in_pktinfo. */
#define SOPT_SIZE_CMSG_PKTINFO_IPV4() (CMSG_SPACE(sizeof(struct in_pktinfo)))
/* XXX This should perhaps be defined even if IP_PKTINFO is not. */
#define SOPT_SIZE_CMSG_PKTINFO(af) \
((af == AF_INET) ? SOPT_SIZE_CMSG_PKTINFO_IPV4() \
: SOPT_SIZE_CMSG_PKTINFO_IPV6()
#endif /* IP_PKTINFO */
#if defined(IP_RECVIF)
/* BSD/Solaris */
#define SOPT_SIZE_CMSG_RECVIF_IPV4() (sizeof(struct sockaddr_dl))
#endif /* IP_RECVIF */
/* SOPT_SIZE_CMSG_IFINDEX_IPV4 - portable type */
#if defined(SOPT_SIZE_CMSG_PKTINFO)
#define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_PKTINFO_IPV4()
#elif defined(SOPT_SIZE_CMSG_RECVIF_IPV4)
#define SOPT_SIZE_CMSG_IFINDEX_IPV4() SOPT_SIZE_CMSG_RECVIF_IPV4()
#else /* Nothing available */
#define SOPT_SIZE_CMSG_IFINDEX_IPV4() (sizeof(char *))
#endif /* SOPT_SIZE_CMSG_IFINDEX_IPV4 */
#define SOPT_SIZE_CMSG_IFINDEX(af) \
(((af) == AF_INET) : SOPT_SIZE_CMSG_IFINDEX_IPV4() \
? SOPT_SIZE_CMSG_PKTINFO_IPV6())
/*
* If not defined then define the value for `TCP_MD5SIG_MAXKEYLEN`. This seems
* to be unavailable for NetBSD 8, FreeBSD 11 and FreeBSD 12.
*
* The value below was copied from `linux/tcp.h` from the Linux kernel headers.
*/
#ifndef TCP_MD5SIG_MAXKEYLEN
#define TCP_MD5SIG_MAXKEYLEN 80
#endif
extern int setsockopt_ipv4_multicast_if(int sock, struct in_addr if_addr,
ifindex_t ifindex);
extern int setsockopt_ipv4_multicast(int sock, int optname,
struct in_addr if_addr,
unsigned int mcast_addr,
ifindex_t ifindex);
extern int setsockopt_ipv4_multicast_loop(int sock, uint8_t val);
extern int setsockopt_ipv4_tos(int sock, int tos);
/* Ask for, and get, ifindex, by whatever method is supported. */
extern int setsockopt_ifindex(int, int, ifindex_t);
extern ifindex_t getsockopt_ifindex(int, struct msghdr *);
/* swab the fields in iph between the host order and system order expected
* for IP_HDRINCL.
*/
extern void sockopt_iphdrincl_swab_htosys(struct ip *iph);
extern void sockopt_iphdrincl_swab_systoh(struct ip *iph);
extern int sockopt_tcp_rtt(int);
/*
* TCP MD5 signature option. This option allows TCP MD5 to be enabled on
* addresses.
*
* sock
* Socket to enable option on.
*
* su
* Sockunion specifying address to enable option on.
*
* password
* MD5 auth password
*/
extern int sockopt_tcp_signature(int sock, union sockunion *su,
const char *password);
/*
* Extended TCP MD5 signature option. This option allows TCP MD5 to be enabled
* on prefixes.
*
* sock
* Socket to enable option on.
*
* su
* Sockunion specifying address (or prefix) to enable option on.
*
* prefixlen
* 0 - su is an address; fall back to non-extended mode
* Else - su is a prefix; prefixlen is the mask length
*
* password
* MD5 auth password
*/
extern int sockopt_tcp_signature_ext(int sock, union sockunion *su,
uint16_t prefixlen, const char *password);
/*
* set TCP max segment size. This option allows user to configure
* max segment size for TCP session
*
* sock
* Socket to enable option on.
*
* tcp_maxseg
* value used for TCP segment size negotiation during SYN
*/
extern int sockopt_tcp_mss_set(int sock, int tcp_maxseg);
/*
* get TCP max segment size. This option allows user to get
* the segment size for TCP session
*
* sock
* Socket to get max segement size.
*/
extern int sockopt_tcp_mss_get(int sock);
/*
* Configure TCP keepalive for a given socket
*
* sock
* Socket to enable keepalive option on.
*
* keepalive_idle
* number of seconds a connection needs to be idle
* before sending out keep-alive proves
*
* keepalive_intvl
* number of seconds between TCP keep-alive probes
*
* keepalive_probes
* max number of probers to send before giving up
* and killing tcp connection
*/
extern int setsockopt_tcp_keepalive(int sock, uint16_t keepalive_idle,
uint16_t keepalive_intvl,
uint16_t keepalive_probes);
/*
* Set IP_TRANSPARENT option to socket
*
* sock
* Socket to enable option on.
*/
extern void sockopt_ip_transparent(int sock);
#ifdef __cplusplus
}
#endif
#endif /*_ZEBRA_SOCKOPT_H */
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