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IPV6_PKTINFO support for v4-mapped IPv6 sockets

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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
This commit is contained in:
Bjoern A. Zeeb 2020-08-07 15:13:53 +00:00
parent 9f91d464a9
commit a9839c4aee
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=364018
3 changed files with 66 additions and 4 deletions
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67
sys/netinet/udp_usrreq.c
View File

@ -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 sockaddr *addr,
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, struct sockaddr *addr,
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 */

2
sys/netinet6/udp6_usrreq.c
View File

@ -784,7 +784,7 @@ udp6_output(struct socket *so, int flags_arg, struct mbuf *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

1
sys/sys/protosw.h
View File

@ -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);