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8a40bccffe
Some vendors do not fill the checksum for IPv6 UDP packets. For interoperability with such implementations one can set UDP_NO_CHECK6_RX socket option on Linux. Thanks to Ville O for the suggestion. Minor changes by committer.
318 lines
6.5 KiB
C
318 lines
6.5 KiB
C
/*
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* BIRD Internet Routing Daemon -- BSD Multicasting and Network Includes
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*
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* (c) 2004 Ondrej Filip <feela@network.cz>
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*
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* Can be freely distributed and used under the terms of the GNU GPL.
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*/
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#include <net/if_dl.h>
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#include <netinet/in_systm.h> // Workaround for some BSDs
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#include <netinet/ip.h>
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#include <sys/param.h>
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#ifdef __FreeBSD__
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/* Should be defined in sysdep/cf/bsd.h, but it is flavor-specific */
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#define CONFIG_DONTROUTE_UNICAST
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#if __FreeBSD_version >= 1201000
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#define CONFIG_USE_IP_MREQN
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#endif
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#endif
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#ifdef __OpenBSD__
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#if OpenBSD >= 202105
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#define CONFIG_USE_IP_MREQN
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#endif
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#endif
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#ifdef __NetBSD__
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#ifndef IP_RECVTTL
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#define IP_RECVTTL 23
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#endif
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#ifndef IP_MINTTL
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#define IP_MINTTL 24
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#endif
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#endif
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#ifdef __DragonFly__
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#define TCP_MD5SIG TCP_SIGNATURE_ENABLE
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#endif
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#undef SA_LEN
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#define SA_LEN(x) (x).sa.sa_len
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/*
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* BSD IPv4 multicast syscalls
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*/
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#define INIT_MREQ4(maddr,ifa) \
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{ .imr_multiaddr = ipa_to_in4(maddr), .imr_interface = ip4_to_in4(ifa->sysdep) }
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#define INIT_MREQN4(maddr,ifa) \
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{ .imr_multiaddr = ipa_to_in4(maddr), .imr_ifindex = ifa->index }
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static inline int
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sk_setup_multicast4(sock *s)
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{
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u8 ttl = s->ttl;
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u8 n = 0;
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#ifdef CONFIG_USE_IP_MREQN
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struct ip_mreqn ifa = { .imr_ifindex = s->iface->index };
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#else
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struct in_addr ifa = ip4_to_in4(s->iface->sysdep);
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#endif
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/* This defines where should we send _outgoing_ multicasts */
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if (setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_IF, &ifa, sizeof(ifa)) < 0)
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ERR("IP_MULTICAST_IF");
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if (setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_TTL, &ttl, sizeof(ttl)) < 0)
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ERR("IP_MULTICAST_TTL");
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if (setsockopt(s->fd, IPPROTO_IP, IP_MULTICAST_LOOP, &n, sizeof(n)) < 0)
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ERR("IP_MULTICAST_LOOP");
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return 0;
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}
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static inline int
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sk_join_group4(sock *s, ip_addr maddr)
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{
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#ifdef CONFIG_USE_IP_MREQN
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struct ip_mreqn mr = INIT_MREQN4(maddr, s->iface);
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#else
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struct ip_mreq mr = INIT_MREQ4(maddr, s->iface);
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#endif
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if (setsockopt(s->fd, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mr, sizeof(mr)) < 0)
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ERR("IP_ADD_MEMBERSHIP");
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return 0;
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}
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static inline int
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sk_leave_group4(sock *s, ip_addr maddr)
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{
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#ifdef CONFIG_USE_IP_MREQN
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struct ip_mreqn mr = INIT_MREQN4(maddr, s->iface);
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#else
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struct ip_mreq mr = INIT_MREQ4(maddr, s->iface);
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#endif
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if (setsockopt(s->fd, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mr, sizeof(mr)) < 0)
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ERR("IP_ADD_MEMBERSHIP");
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return 0;
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}
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/*
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* BSD IPv4 packet control messages
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*/
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/* It uses IP_RECVDSTADDR / IP_RECVIF socket options instead of IP_PKTINFO */
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#define CMSG4_SPACE_PKTINFO (CMSG_SPACE(sizeof(struct in_addr)) + \
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CMSG_SPACE(sizeof(struct sockaddr_dl)))
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#define CMSG4_SPACE_TTL CMSG_SPACE(sizeof(char))
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static inline int
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sk_request_cmsg4_pktinfo(sock *s)
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{
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int y = 1;
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if (setsockopt(s->fd, IPPROTO_IP, IP_RECVDSTADDR, &y, sizeof(y)) < 0)
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ERR("IP_RECVDSTADDR");
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if (setsockopt(s->fd, IPPROTO_IP, IP_RECVIF, &y, sizeof(y)) < 0)
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ERR("IP_RECVIF");
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return 0;
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}
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static inline int
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sk_request_cmsg4_ttl(sock *s)
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{
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int y = 1;
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if (setsockopt(s->fd, IPPROTO_IP, IP_RECVTTL, &y, sizeof(y)) < 0)
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ERR("IP_RECVTTL");
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return 0;
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}
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static inline void
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sk_process_cmsg4_pktinfo(sock *s, struct cmsghdr *cm)
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{
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if (cm->cmsg_type == IP_RECVDSTADDR)
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s->laddr = ipa_from_in4(* (struct in_addr *) CMSG_DATA(cm));
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if (cm->cmsg_type == IP_RECVIF)
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s->lifindex = ((struct sockaddr_dl *) CMSG_DATA(cm))->sdl_index;
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}
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static inline void
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sk_process_cmsg4_ttl(sock *s, struct cmsghdr *cm)
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{
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if (cm->cmsg_type == IP_RECVTTL)
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s->rcv_ttl = * (byte *) CMSG_DATA(cm);
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}
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#ifdef IP_SENDSRCADDR
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static inline void
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sk_prepare_cmsgs4(sock *s, struct msghdr *msg, void *cbuf, size_t cbuflen)
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{
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/* Unfortunately, IP_SENDSRCADDR does not work for raw IP sockets on BSD kernels */
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struct cmsghdr *cm;
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struct in_addr *sa;
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int controllen = 0;
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msg->msg_control = cbuf;
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msg->msg_controllen = cbuflen;
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cm = CMSG_FIRSTHDR(msg);
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cm->cmsg_level = IPPROTO_IP;
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cm->cmsg_type = IP_SENDSRCADDR;
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cm->cmsg_len = CMSG_LEN(sizeof(*sa));
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controllen += CMSG_SPACE(sizeof(*sa));
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sa = (struct in_addr *) CMSG_DATA(cm);
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*sa = ipa_to_in4(s->saddr);
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msg->msg_controllen = controllen;
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}
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#else
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static inline void
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sk_prepare_cmsgs4(sock *s UNUSED, struct msghdr *msg UNUSED, void *cbuf UNUSED, size_t cbuflen UNUSED) { }
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#endif
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static void UNUSED
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sk_prepare_ip_header(sock *s, void *hdr, int dlen)
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{
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struct ip *ip = hdr;
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bzero(ip, 20);
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ip->ip_v = 4;
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ip->ip_hl = 5;
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ip->ip_tos = (s->tos < 0) ? 0 : s->tos;
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ip->ip_len = 20 + dlen;
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ip->ip_ttl = (s->ttl < 0) ? 64 : s->ttl;
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ip->ip_p = s->dport;
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ip->ip_src = ipa_to_in4(s->saddr);
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ip->ip_dst = ipa_to_in4(s->daddr);
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#if (defined __OpenBSD__) || (defined __DragonFly__) || (defined __FreeBSD__ && (__FreeBSD_version >= 1100030))
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/* Different BSDs have different expectations of ip_len endianity */
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ip->ip_len = htons(ip->ip_len);
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#endif
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}
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/*
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* Miscellaneous BSD socket syscalls
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*/
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#ifndef TCP_KEYLEN_MAX
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#define TCP_KEYLEN_MAX 80
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#endif
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#ifndef TCP_SIG_SPI
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#define TCP_SIG_SPI 0x1000
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#endif
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#if defined(__FreeBSD__)
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#define USE_MD5SIG_SETKEY
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#include "sysdep/bsd/setkey.h"
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#endif
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int
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sk_set_md5_auth(sock *s, ip_addr local UNUSED, ip_addr remote UNUSED, int pxlen UNUSED, struct iface *ifa UNUSED, const char *passwd, int setkey UNUSED)
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{
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#ifdef USE_MD5SIG_SETKEY
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if (setkey)
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if (sk_set_md5_in_sasp_db(s, local, remote, pxlen, ifa, passwd) < 0)
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return -1;
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#endif
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int enable = (passwd && *passwd) ? TCP_SIG_SPI : 0;
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if (setsockopt(s->fd, IPPROTO_TCP, TCP_MD5SIG, &enable, sizeof(enable)) < 0)
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{
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if (errno == ENOPROTOOPT)
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ERR_MSG("Kernel does not support TCP MD5 signatures");
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else
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ERR("TCP_MD5SIG");
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}
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return 0;
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}
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static inline int
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sk_set_min_ttl4(sock *s, int ttl)
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{
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if (setsockopt(s->fd, IPPROTO_IP, IP_MINTTL, &ttl, sizeof(ttl)) < 0)
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{
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if (errno == ENOPROTOOPT)
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ERR_MSG("Kernel does not support IPv4 TTL security");
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else
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ERR("IP_MINTTL");
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}
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return 0;
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}
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static inline int
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sk_set_min_ttl6(sock *s, int ttl UNUSED)
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{
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ERR_MSG("Kernel does not support IPv6 TTL security");
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}
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static inline int
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sk_disable_mtu_disc4(sock *s UNUSED)
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{
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/* TODO: Set IP_DONTFRAG to 0 ? */
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return 0;
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}
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static inline int
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sk_disable_mtu_disc6(sock *s UNUSED)
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{
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/* TODO: Set IPV6_DONTFRAG to 0 ? */
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return 0;
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}
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int sk_priority_control = -1;
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static inline int
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sk_set_priority(sock *s, int prio UNUSED)
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{
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ERR_MSG("Socket priority not supported");
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}
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static inline int
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sk_set_freebind(sock *s)
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{
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ERR_MSG("Freebind is not supported");
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}
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static inline int
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sk_set_udp6_no_csum_rx(sock *s)
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{
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ERR_MSG("UDPv6 zero checksum is not supported");
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}
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