Author: bz Date: Fri Aug 7 15:13:53 2020 New Revision: 364018 URL: https://svnweb.freebsd.org/changeset/base/364018
Log: IPV6_PKTINFO support for v4-mapped IPv6 sockets When using v4-mapped IPv6 sockets with IPV6_PKTINFO we do not respect the given v4-mapped src address on the IPv4 socket. Implement the needed functionality. This allows single-socket UDP applications (such as OpenVPN) to work better on FreeBSD. Requested by: Gert Doering (gert greenie.net), pfsense Tested by: Gert Doering (gert greenie.net) Reviewed by: melifaro MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D24135 Modified: head/sys/netinet/udp_usrreq.c head/sys/netinet6/udp6_usrreq.c head/sys/sys/protosw.h Modified: head/sys/netinet/udp_usrreq.c ============================================================================== --- head/sys/netinet/udp_usrreq.c Fri Aug 7 15:11:27 2020 (r364017) +++ head/sys/netinet/udp_usrreq.c Fri Aug 7 15:13:53 2020 (r364018) @@ -163,7 +163,7 @@ VNET_PCPUSTAT_SYSUNINIT(udpstat); #ifdef INET static void udp_detach(struct socket *so); static int udp_output(struct inpcb *, struct mbuf *, struct sockaddr *, - struct mbuf *, struct thread *); + struct mbuf *, struct thread *, int); #endif static void @@ -1083,9 +1083,65 @@ udp_ctloutput(struct socket *so, struct sockopt *sopt) } #ifdef INET +#ifdef INET6 +/* The logic here is derived from ip6_setpktopt(). See comments there. */ static int +udp_v4mapped_pktinfo(struct cmsghdr *cm, struct sockaddr_in * src, + struct inpcb *inp, int flags) +{ + struct ifnet *ifp; + struct in6_pktinfo *pktinfo; + struct in_addr ia; + + if ((flags & PRUS_IPV6) == 0) + return (0); + + if (cm->cmsg_level != IPPROTO_IPV6) + return (0); + + if (cm->cmsg_type != IPV6_2292PKTINFO && + cm->cmsg_type != IPV6_PKTINFO) + return (0); + + if (cm->cmsg_len != + CMSG_LEN(sizeof(struct in6_pktinfo))) + return (EINVAL); + + pktinfo = (struct in6_pktinfo *)CMSG_DATA(cm); + if (!IN6_IS_ADDR_V4MAPPED(&pktinfo->ipi6_addr) && + !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) + return (EINVAL); + + /* Validate the interface index if specified. */ + if (pktinfo->ipi6_ifindex > V_if_index) + return (ENXIO); + + ifp = NULL; + if (pktinfo->ipi6_ifindex) { + ifp = ifnet_byindex(pktinfo->ipi6_ifindex); + if (ifp == NULL) + return (ENXIO); + } + if (ifp != NULL && !IN6_IS_ADDR_UNSPECIFIED(&pktinfo->ipi6_addr)) { + + ia.s_addr = pktinfo->ipi6_addr.s6_addr32[3]; + if (in_ifhasaddr(ifp, ia) == 0) + return (EADDRNOTAVAIL); + } + + bzero(src, sizeof(*src)); + src->sin_family = AF_INET; + src->sin_len = sizeof(*src); + src->sin_port = inp->inp_lport; + src->sin_addr.s_addr = pktinfo->ipi6_addr.s6_addr32[3]; + + return (0); +} +#endif + +static int udp_output(struct inpcb *inp, struct mbuf *m, struct sockaddr *addr, - struct mbuf *control, struct thread *td) + struct mbuf *control, struct thread *td, int flags) { struct udpiphdr *ui; int len = m->m_pkthdr.len; @@ -1149,6 +1205,11 @@ udp_output(struct inpcb *inp, struct mbuf *m, struct s error = EINVAL; break; } +#ifdef INET6 + error = udp_v4mapped_pktinfo(cm, &src, inp, flags); + if (error != 0) + break; +#endif if (cm->cmsg_level != IPPROTO_IP) continue; @@ -1696,7 +1757,7 @@ udp_send(struct socket *so, int flags, struct mbuf *m, inp = sotoinpcb(so); KASSERT(inp != NULL, ("udp_send: inp == NULL")); - return (udp_output(inp, m, addr, control, td)); + return (udp_output(inp, m, addr, control, td, flags)); } #endif /* INET */ Modified: head/sys/netinet6/udp6_usrreq.c ============================================================================== --- head/sys/netinet6/udp6_usrreq.c Fri Aug 7 15:11:27 2020 (r364017) +++ head/sys/netinet6/udp6_usrreq.c Fri Aug 7 15:13:53 2020 (r364018) @@ -784,7 +784,7 @@ udp6_output(struct socket *so, int flags_arg, struct m in6_sin6_2_sin_in_sock((struct sockaddr *)sin6); pru = inetsw[ip_protox[nxt]].pr_usrreqs; /* addr will just be freed in sendit(). */ - return ((*pru->pru_send)(so, flags_arg, m, + return ((*pru->pru_send)(so, flags_arg | PRUS_IPV6, m, (struct sockaddr *)sin6, control, td)); } } else Modified: head/sys/sys/protosw.h ============================================================================== --- head/sys/sys/protosw.h Fri Aug 7 15:11:27 2020 (r364017) +++ head/sys/sys/protosw.h Fri Aug 7 15:13:53 2020 (r364018) @@ -210,6 +210,7 @@ struct pr_usrreqs { #define PRUS_EOF 0x2 #define PRUS_MORETOCOME 0x4 #define PRUS_NOTREADY 0x8 +#define PRUS_IPV6 0x10 int (*pru_ready)(struct socket *so, struct mbuf *m, int count); int (*pru_sense)(struct socket *so, struct stat *sb); int (*pru_shutdown)(struct socket *so); _______________________________________________ [email protected] mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "[email protected]"
