+/*
+ * Copyright (c) 2000-2019 Apple Inc. All rights reserved.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. The rights granted to you under the License
+ * may not be used to create, or enable the creation or redistribution of,
+ * unlawful or unlicensed copies of an Apple operating system, or to
+ * circumvent, violate, or enable the circumvention or violation of, any
+ * terms of an Apple operating system software license agreement.
+ *
+ * Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_OSREFERENCE_LICENSE_HEADER_END@
+ */
+
/* $FreeBSD: src/sys/netinet6/udp6_usrreq.c,v 1.6.2.6 2001/07/29 19:32:40 ume Exp $ */
/* $KAME: udp6_usrreq.c,v 1.27 2001/05/21 05:45:10 jinmei Exp $ */
*
* @(#)udp_var.h 8.1 (Berkeley) 6/10/93
*/
-
-#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
+#include <sys/param.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/systm.h>
#include <sys/syslog.h>
#include <sys/proc.h>
+#include <sys/kauth.h>
#include <net/if.h>
#include <net/route.h>
#include <net/if_types.h>
+#include <net/ntstat.h>
+#include <net/dlil.h>
+#include <net/net_api_stats.h>
#include <netinet/in.h>
#include <netinet/in_systm.h>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ipsec6.h>
+#include <netinet6/esp6.h>
extern int ipsec_bypass;
-#endif /*IPSEC*/
+extern int esp_udp_encap_port;
+#endif /* IPSEC */
-#include "faith.h"
-#if defined(NFAITH) && NFAITH > 0
-#include <net/if_faith.h>
-#endif
+#if NECP
+#include <net/necp.h>
+#endif /* NECP */
+
+#if FLOW_DIVERT
+#include <netinet/flow_divert.h>
+#endif /* FLOW_DIVERT */
+
+#if CONTENT_FILTER
+#include <net/content_filter.h>
+#endif /* CONTENT_FILTER */
/*
* UDP protocol inplementation.
* Per RFC 768, August, 1980.
*/
-extern struct protosw inetsw[];
-static int in6_mcmatch __P((struct inpcb *, struct in6_addr *, struct ifnet *));
-static int udp6_detach __P((struct socket *so));
-
-static int
-in6_mcmatch(in6p, ia6, ifp)
- struct inpcb *in6p;
- register struct in6_addr *ia6;
- struct ifnet *ifp;
-{
- struct ip6_moptions *im6o = in6p->in6p_moptions;
- struct in6_multi_mship *imm;
+static int udp6_abort(struct socket *);
+static int udp6_attach(struct socket *, int, struct proc *);
+static int udp6_bind(struct socket *, struct sockaddr *, struct proc *);
+static int udp6_connectx(struct socket *, struct sockaddr *,
+ struct sockaddr *, struct proc *, uint32_t, sae_associd_t,
+ sae_connid_t *, uint32_t, void *, uint32_t, struct uio *, user_ssize_t *);
+static int udp6_detach(struct socket *);
+static int udp6_disconnect(struct socket *);
+static int udp6_disconnectx(struct socket *, sae_associd_t, sae_connid_t);
+static int udp6_send(struct socket *, int, struct mbuf *, struct sockaddr *,
+ struct mbuf *, struct proc *);
+static void udp6_append(struct inpcb *, struct ip6_hdr *,
+ struct sockaddr_in6 *, struct mbuf *, int, struct ifnet *);
+static int udp6_input_checksum(struct mbuf *, struct udphdr *, int, int);
- if (im6o == NULL)
- return 0;
+struct pr_usrreqs udp6_usrreqs = {
+ .pru_abort = udp6_abort,
+ .pru_attach = udp6_attach,
+ .pru_bind = udp6_bind,
+ .pru_connect = udp6_connect,
+ .pru_connectx = udp6_connectx,
+ .pru_control = in6_control,
+ .pru_detach = udp6_detach,
+ .pru_disconnect = udp6_disconnect,
+ .pru_disconnectx = udp6_disconnectx,
+ .pru_peeraddr = in6_mapped_peeraddr,
+ .pru_send = udp6_send,
+ .pru_shutdown = udp_shutdown,
+ .pru_sockaddr = in6_mapped_sockaddr,
+ .pru_sosend = sosend,
+ .pru_soreceive = soreceive,
+ .pru_soreceive_list = soreceive_list,
+};
- for (imm = im6o->im6o_memberships.lh_first; imm != NULL;
- imm = imm->i6mm_chain.le_next) {
- if ((ifp == NULL ||
- imm->i6mm_maddr->in6m_ifp == ifp) &&
- IN6_ARE_ADDR_EQUAL(&imm->i6mm_maddr->in6m_addr,
- ia6))
- return 1;
+/*
+ * subroutine of udp6_input(), mainly for source code readability.
+ */
+static void
+udp6_append(struct inpcb *last, struct ip6_hdr *ip6,
+ struct sockaddr_in6 *udp_in6, struct mbuf *n, int off, struct ifnet *ifp)
+{
+#pragma unused(ip6)
+ struct mbuf *opts = NULL;
+ int ret = 0;
+ boolean_t cell = IFNET_IS_CELLULAR(ifp);
+ boolean_t wifi = (!cell && IFNET_IS_WIFI(ifp));
+ boolean_t wired = (!wifi && IFNET_IS_WIRED(ifp));
+
+#if CONFIG_MACF_NET
+ if (mac_inpcb_check_deliver(last, n, AF_INET6, SOCK_DGRAM) != 0) {
+ m_freem(n);
+ return;
+ }
+#endif /* CONFIG_MACF_NET */
+ if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
+ (last->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
+ ret = ip6_savecontrol(last, n, &opts);
+ if (ret != 0) {
+ m_freem(n);
+ m_freem(opts);
+ return;
+ }
+ }
+ m_adj(n, off);
+ if (nstat_collect) {
+ INP_ADD_STAT(last, cell, wifi, wired, rxpackets, 1);
+ INP_ADD_STAT(last, cell, wifi, wired, rxbytes, n->m_pkthdr.len);
+ inp_set_activity_bitmap(last);
+ }
+ so_recv_data_stat(last->in6p_socket, n, 0);
+ if (sbappendaddr(&last->in6p_socket->so_rcv,
+ (struct sockaddr *)udp_in6, n, opts, NULL) == 0) {
+ udpstat.udps_fullsock++;
+ } else {
+ sorwakeup(last->in6p_socket);
}
- return 0;
}
int
-udp6_input(mp, offp, proto)
- struct mbuf **mp;
- int *offp, proto;
+udp6_input(struct mbuf **mp, int *offp, int proto)
{
+#pragma unused(proto)
struct mbuf *m = *mp;
- register struct ip6_hdr *ip6;
- register struct udphdr *uh;
- register struct inpcb *in6p;
+ struct ifnet *ifp;
+ struct ip6_hdr *ip6;
+ struct udphdr *uh;
+ struct inpcb *in6p;
struct mbuf *opts = NULL;
int off = *offp;
- int plen, ulen;
+ int plen, ulen, ret = 0;
+ boolean_t cell, wifi, wired;
struct sockaddr_in6 udp_in6;
+ struct inpcbinfo *pcbinfo = &udbinfo;
+ struct sockaddr_in6 fromsa;
- IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), IPPROTO_DONE);
+ IP6_EXTHDR_CHECK(m, off, sizeof(struct udphdr), return IPPROTO_DONE);
- ip6 = mtod(m, struct ip6_hdr *);
+ /* Expect 32-bit aligned data pointer on strict-align platforms */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
-#if defined(NFAITH) && 0 < NFAITH
- if (faithprefix(&ip6->ip6_dst)) {
- /* XXX send icmp6 host/port unreach? */
- m_freem(m);
- return IPPROTO_DONE;
- }
-#endif
+ ifp = m->m_pkthdr.rcvif;
+ ip6 = mtod(m, struct ip6_hdr *);
+ cell = IFNET_IS_CELLULAR(ifp);
+ wifi = (!cell && IFNET_IS_WIFI(ifp));
+ wired = (!wifi && IFNET_IS_WIRED(ifp));
udpstat.udps_ipackets++;
plen = ntohs(ip6->ip6_plen) - off + sizeof(*ip6);
- uh = (struct udphdr *)((caddr_t)ip6 + off);
+ uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
ulen = ntohs((u_short)uh->uh_ulen);
if (plen != ulen) {
udpstat.udps_badlen++;
+ IF_UDP_STATINC(ifp, badlength);
+ goto bad;
+ }
+
+ /* destination port of 0 is illegal, based on RFC768. */
+ if (uh->uh_dport == 0) {
+ IF_UDP_STATINC(ifp, port0);
goto bad;
}
/*
* Checksum extended UDP header and data.
*/
-#ifndef __APPLE__
- if (uh->uh_sum == 0)
- udpstat.udps_nosum++;
-#endif
- else if (in6_cksum(m, IPPROTO_UDP, off, ulen) != 0) {
- udpstat.udps_badsum++;
+ if (udp6_input_checksum(m, uh, off, ulen)) {
goto bad;
}
+ /*
+ * Construct sockaddr format source address.
+ */
+ init_sin6(&fromsa, m);
+ fromsa.sin6_port = uh->uh_sport;
+
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
- struct inpcb *last;
+ int reuse_sock = 0, mcast_delivered = 0;
+ struct ip6_moptions *imo;
/*
* Deliver a multicast datagram to all sockets
* Locate pcb(s) for datagram.
* (Algorithm copied from raw_intr().)
*/
- last = NULL;
+ lck_rw_lock_shared(pcbinfo->ipi_lock);
+
LIST_FOREACH(in6p, &udb, inp_list) {
- if ((in6p->inp_vflag & INP_IPV6) == 0)
+#if IPSEC
+ int skipit;
+#endif /* IPSEC */
+
+ if ((in6p->inp_vflag & INP_IPV6) == 0) {
continue;
- if (in6p->in6p_lport != uh->uh_dport)
+ }
+
+ if (inp_restricted_recv(in6p, ifp)) {
continue;
- if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_laddr)) {
- if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_laddr,
- &ip6->ip6_dst) &&
- !in6_mcmatch(in6p, &ip6->ip6_dst,
- m->m_pkthdr.rcvif))
- continue;
}
- if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr)) {
- if (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
- &ip6->ip6_src) ||
- in6p->in6p_fport != uh->uh_sport)
+
+ if (in_pcb_checkstate(in6p, WNT_ACQUIRE, 0) ==
+ WNT_STOPUSING) {
+ continue;
+ }
+
+ udp_lock(in6p->in6p_socket, 1, 0);
+
+ if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) ==
+ WNT_STOPUSING) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ continue;
+ }
+ if (in6p->in6p_lport != uh->uh_dport) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ continue;
+ }
+
+ /*
+ * Handle socket delivery policy for any-source
+ * and source-specific multicast. [RFC3678]
+ */
+ imo = in6p->in6p_moptions;
+ if (imo && IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
+ struct sockaddr_in6 mcaddr;
+ int blocked;
+
+ IM6O_LOCK(imo);
+ bzero(&mcaddr, sizeof(struct sockaddr_in6));
+ mcaddr.sin6_len = sizeof(struct sockaddr_in6);
+ mcaddr.sin6_family = AF_INET6;
+ mcaddr.sin6_addr = ip6->ip6_dst;
+
+ blocked = im6o_mc_filter(imo, ifp,
+ &mcaddr, &fromsa);
+ IM6O_UNLOCK(imo);
+ if (blocked != MCAST_PASS) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ if (blocked == MCAST_NOTSMEMBER ||
+ blocked == MCAST_MUTED) {
+ udpstat.udps_filtermcast++;
+ }
continue;
+ }
+ }
+ if (!IN6_IS_ADDR_UNSPECIFIED(&in6p->in6p_faddr) &&
+ (!IN6_ARE_ADDR_EQUAL(&in6p->in6p_faddr,
+ &ip6->ip6_src) ||
+ in6p->in6p_fport != uh->uh_sport)) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ continue;
}
- if (last != NULL) {
- struct mbuf *n;
+ reuse_sock = in6p->inp_socket->so_options &
+ (SO_REUSEPORT | SO_REUSEADDR);
-#if IPSEC
+#if NECP
+ skipit = 0;
+ if (!necp_socket_is_allowed_to_send_recv_v6(in6p,
+ uh->uh_dport, uh->uh_sport, &ip6->ip6_dst,
+ &ip6->ip6_src, ifp, NULL, NULL, NULL)) {
+ /* do not inject data to pcb */
+ skipit = 1;
+ }
+ if (skipit == 0)
+#endif /* NECP */
+ {
+ struct mbuf *n = NULL;
/*
- * Check AH/ESP integrity.
+ * KAME NOTE: do not
+ * m_copy(m, offset, ...) below.
+ * sbappendaddr() expects M_PKTHDR,
+ * and m_copy() will copy M_PKTHDR
+ * only if offset is 0.
*/
- if (ipsec_bypass == 0 && ipsec6_in_reject_so(m, last->inp_socket))
- ipsec6stat.in_polvio++;
- /* do not inject data into pcb */
- else
-#endif /*IPSEC*/
- if ((n = m_copy(m, 0, M_COPYALL)) != NULL) {
- /*
- * KAME NOTE: do not
- * m_copy(m, offset, ...) above.
- * sbappendaddr() expects M_PKTHDR,
- * and m_copy() will copy M_PKTHDR
- * only if offset is 0.
- */
- if (last->in6p_flags & IN6P_CONTROLOPTS
- || last->in6p_socket->so_options & SO_TIMESTAMP)
- ip6_savecontrol(last, &opts,
- ip6, n);
-
- m_adj(n, off + sizeof(struct udphdr));
- if (sbappendaddr(&last->in6p_socket->so_rcv,
- (struct sockaddr *)&udp_in6,
- n, opts) == 0) {
- m_freem(n);
- if (opts)
- m_freem(opts);
- udpstat.udps_fullsock++;
- } else
- sorwakeup(last->in6p_socket);
- opts = NULL;
+ if (reuse_sock) {
+ n = m_copy(m, 0, M_COPYALL);
}
+ udp6_append(in6p, ip6, &udp_in6, m,
+ off + sizeof(struct udphdr), ifp);
+ mcast_delivered++;
+ m = n;
}
- last = in6p;
+ udp_unlock(in6p->in6p_socket, 1, 0);
+
/*
* Don't look for additional matches if this one does
* not have either the SO_REUSEPORT or SO_REUSEADDR
* port. It assumes that an application will never
* clear these options after setting them.
*/
- if ((last->in6p_socket->so_options &
- (SO_REUSEPORT|SO_REUSEADDR)) == 0)
+ if (reuse_sock == 0 || m == NULL) {
break;
+ }
+
+ /*
+ * Expect 32-bit aligned data pointer on strict-align
+ * platforms.
+ */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ /*
+ * Recompute IP and UDP header pointers for new mbuf
+ */
+ ip6 = mtod(m, struct ip6_hdr *);
+ uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
}
+ lck_rw_done(pcbinfo->ipi_lock);
- if (last == NULL) {
+ if (mcast_delivered == 0) {
/*
* No matching pcb found; discard datagram.
* (No need to send an ICMP Port Unreachable
* for a broadcast or multicast datgram.)
*/
udpstat.udps_noport++;
-#ifndef __APPLE__
udpstat.udps_noportmcast++;
-#endif
+ IF_UDP_STATINC(ifp, port_unreach);
goto bad;
}
+
+ /* free the extra copy of mbuf or skipped by NECP */
+ if (m != NULL) {
+ m_freem(m);
+ }
+ return IPPROTO_DONE;
+ }
+
#if IPSEC
- /*
- * Check AH/ESP integrity.
- */
- if (ipsec_bypass == 0 && ipsec6_in_reject_so(m, last->inp_socket)) {
- ipsec6stat.in_polvio++;
- goto bad;
+ /*
+ * UDP to port 4500 with a payload where the first four bytes are
+ * not zero is a UDP encapsulated IPsec packet. Packets where
+ * the payload is one byte and that byte is 0xFF are NAT keepalive
+ * packets. Decapsulate the ESP packet and carry on with IPsec input
+ * or discard the NAT keep-alive.
+ */
+ if (ipsec_bypass == 0 && (esp_udp_encap_port & 0xFFFF) != 0 &&
+ (uh->uh_dport == ntohs((u_short)esp_udp_encap_port) ||
+ uh->uh_sport == ntohs((u_short)esp_udp_encap_port))) {
+ int payload_len = ulen - sizeof(struct udphdr) > 4 ? 4 :
+ ulen - sizeof(struct udphdr);
+
+ if (m->m_len < off + sizeof(struct udphdr) + payload_len) {
+ if ((m = m_pullup(m, off + sizeof(struct udphdr) +
+ payload_len)) == NULL) {
+ udpstat.udps_hdrops++;
+ goto bad;
+ }
+ /*
+ * Expect 32-bit aligned data pointer on strict-align
+ * platforms.
+ */
+ MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
+
+ ip6 = mtod(m, struct ip6_hdr *);
+ uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
}
-#endif /*IPSEC*/
- if (last->in6p_flags & IN6P_CONTROLOPTS
- || last->in6p_socket->so_options & SO_TIMESTAMP)
- ip6_savecontrol(last, &opts, ip6, m);
-
- m_adj(m, off + sizeof(struct udphdr));
- if (sbappendaddr(&last->in6p_socket->so_rcv,
- (struct sockaddr *)&udp_in6,
- m, opts) == 0) {
- udpstat.udps_fullsock++;
+ /* Check for NAT keepalive packet */
+ if (payload_len == 1 && *(u_int8_t*)
+ ((caddr_t)uh + sizeof(struct udphdr)) == 0xFF) {
goto bad;
+ } else if (payload_len == 4 && *(u_int32_t*)(void *)
+ ((caddr_t)uh + sizeof(struct udphdr)) != 0) {
+ /* UDP encapsulated IPsec packet to pass through NAT */
+ /* preserve the udp header */
+ *offp = off + sizeof(struct udphdr);
+ return esp6_input(mp, offp, IPPROTO_UDP);
}
- sorwakeup(last->in6p_socket);
- return IPPROTO_DONE;
}
+#endif /* IPSEC */
+
/*
* Locate pcb for datagram.
*/
in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
- &ip6->ip6_dst, uh->uh_dport, 1,
- m->m_pkthdr.rcvif);
- if (in6p == 0) {
- if (log_in_vain) {
+ &ip6->ip6_dst, uh->uh_dport, 1, m->m_pkthdr.rcvif);
+ if (in6p == NULL) {
+ IF_UDP_STATINC(ifp, port_unreach);
+
+ if (udp_log_in_vain) {
char buf[INET6_ADDRSTRLEN];
- strcpy(buf, ip6_sprintf(&ip6->ip6_dst));
- log(LOG_INFO,
- "Connection attempt to UDP %s:%d from %s:%d\n",
- buf, ntohs(uh->uh_dport),
- ip6_sprintf(&ip6->ip6_src), ntohs(uh->uh_sport));
+ strlcpy(buf, ip6_sprintf(&ip6->ip6_dst), sizeof(buf));
+ if (udp_log_in_vain < 3) {
+ log(LOG_INFO, "Connection attempt to UDP "
+ "%s:%d from %s:%d\n", buf,
+ ntohs(uh->uh_dport),
+ ip6_sprintf(&ip6->ip6_src),
+ ntohs(uh->uh_sport));
+ } else if (!(m->m_flags & (M_BCAST | M_MCAST)) &&
+ !IN6_ARE_ADDR_EQUAL(&ip6->ip6_dst, &ip6->ip6_src)) {
+ log(LOG_INFO, "Connection attempt "
+ "to UDP %s:%d from %s:%d\n", buf,
+ ntohs(uh->uh_dport),
+ ip6_sprintf(&ip6->ip6_src),
+ ntohs(uh->uh_sport));
+ }
}
udpstat.udps_noport++;
if (m->m_flags & M_MCAST) {
printf("UDP6: M_MCAST is set in a unicast packet.\n");
-#ifndef __APPLE__
udpstat.udps_noportmcast++;
-#endif
+ IF_UDP_STATINC(ifp, badmcast);
goto bad;
}
icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
return IPPROTO_DONE;
}
-#if IPSEC
- /*
- * Check AH/ESP integrity.
- */
- if (ipsec_bypass == 0 && ipsec6_in_reject_so(m, in6p->in6p_socket)) {
- ipsec6stat.in_polvio++;
+#if NECP
+ if (!necp_socket_is_allowed_to_send_recv_v6(in6p, uh->uh_dport,
+ uh->uh_sport, &ip6->ip6_dst, &ip6->ip6_src, ifp, NULL, NULL, NULL)) {
+ in_pcb_checkstate(in6p, WNT_RELEASE, 0);
+ IF_UDP_STATINC(ifp, badipsec);
goto bad;
}
-#endif /*IPSEC*/
+#endif /* NECP */
/*
* Construct sockaddr format source address.
* Stuff source address and datagram in user buffer.
*/
+ udp_lock(in6p->in6p_socket, 1, 0);
+
+ if (in_pcb_checkstate(in6p, WNT_RELEASE, 1) == WNT_STOPUSING) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ IF_UDP_STATINC(ifp, cleanup);
+ goto bad;
+ }
+
init_sin6(&udp_in6, m); /* general init */
udp_in6.sin6_port = uh->uh_sport;
- if (in6p->in6p_flags & IN6P_CONTROLOPTS
- || in6p->in6p_socket->so_options & SO_TIMESTAMP)
- ip6_savecontrol(in6p, &opts, ip6, m);
+ if ((in6p->in6p_flags & INP_CONTROLOPTS) != 0 ||
+ (in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
+ (in6p->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 0 ||
+ (in6p->in6p_socket->so_options & SO_TIMESTAMP_CONTINUOUS) != 0) {
+ ret = ip6_savecontrol(in6p, m, &opts);
+ if (ret != 0) {
+ udp_unlock(in6p->in6p_socket, 1, 0);
+ goto bad;
+ }
+ }
m_adj(m, off + sizeof(struct udphdr));
+ if (nstat_collect) {
+ INP_ADD_STAT(in6p, cell, wifi, wired, rxpackets, 1);
+ INP_ADD_STAT(in6p, cell, wifi, wired, rxbytes, m->m_pkthdr.len);
+ inp_set_activity_bitmap(in6p);
+ }
+ so_recv_data_stat(in6p->in6p_socket, m, 0);
if (sbappendaddr(&in6p->in6p_socket->so_rcv,
- (struct sockaddr *)&udp_in6,
- m, opts) == 0) {
+ (struct sockaddr *)&udp_in6, m, opts, NULL) == 0) {
+ m = NULL;
+ opts = NULL;
udpstat.udps_fullsock++;
+ udp_unlock(in6p->in6p_socket, 1, 0);
goto bad;
}
sorwakeup(in6p->in6p_socket);
+ udp_unlock(in6p->in6p_socket, 1, 0);
return IPPROTO_DONE;
bad:
- if (m)
+ if (m != NULL) {
m_freem(m);
- if (opts)
+ }
+ if (opts != NULL) {
m_freem(opts);
+ }
return IPPROTO_DONE;
}
void
-udp6_ctlinput(cmd, sa, d)
- int cmd;
- struct sockaddr *sa;
- void *d;
+udp6_ctlinput(int cmd, struct sockaddr *sa, void *d, __unused struct ifnet *ifp)
{
struct udphdr uh;
struct ip6_hdr *ip6;
struct mbuf *m;
int off = 0;
struct ip6ctlparam *ip6cp = NULL;
+ struct icmp6_hdr *icmp6 = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
- void (*notify) __P((struct inpcb *, int)) = udp_notify;
+ void (*notify)(struct inpcb *, int) = udp_notify;
struct udp_portonly {
u_int16_t uh_sport;
u_int16_t uh_dport;
} *uhp;
if (sa->sa_family != AF_INET6 ||
- sa->sa_len != sizeof(struct sockaddr_in6))
+ sa->sa_len != sizeof(struct sockaddr_in6)) {
return;
+ }
- if ((unsigned)cmd >= PRC_NCMDS)
+ if ((unsigned)cmd >= PRC_NCMDS) {
return;
- if (PRC_IS_REDIRECT(cmd))
- notify = in6_rtchange, d = NULL;
- else if (cmd == PRC_HOSTDEAD)
+ }
+ if (PRC_IS_REDIRECT(cmd)) {
+ notify = in6_rtchange;
d = NULL;
- else if (inet6ctlerrmap[cmd] == 0)
+ } else if (cmd == PRC_HOSTDEAD) {
+ d = NULL;
+ } else if (inet6ctlerrmap[cmd] == 0) {
return;
+ }
/* if the parameter is from icmp6, decode it. */
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
+ icmp6 = ip6cp->ip6c_icmp6;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
sa6_src = &sa6_any;
}
- if (ip6) {
+ if (ip6 != NULL) {
/*
* XXX: We assume that when IPV6 is non NULL,
* M and OFF are valid.
*/
-
/* check if we can safely examine src and dst ports */
- if (m->m_pkthdr.len < off + sizeof(*uhp))
+ if (m->m_pkthdr.len < off + sizeof(*uhp)) {
return;
+ }
bzero(&uh, sizeof(uh));
m_copydata(m, off, sizeof(*uhp), (caddr_t)&uh);
- (void) in6_pcbnotify(&udb, sa, uh.uh_dport,
- (struct sockaddr*)ip6cp->ip6c_src,
- uh.uh_sport, cmd, notify);
- } else
- (void) in6_pcbnotify(&udb, sa, 0, (struct sockaddr *)&sa6_src,
- 0, cmd, notify);
-}
-
-#ifndef __APPLE__
-static int
-udp6_getcred SYSCTL_HANDLER_ARGS
-{
- struct sockaddr_in6 addrs[2];
- struct inpcb *inp;
- int error, s;
-
- error = suser(req->p->p_ucred, &req->p->p_acflag);
- if (error)
- return (error);
-
- if (req->newlen != sizeof(addrs))
- return (EINVAL);
- if (req->oldlen != sizeof(struct ucred))
- return (EINVAL);
- error = SYSCTL_IN(req, addrs, sizeof(addrs));
- if (error)
- return (error);
- s = splnet();
- inp = in6_pcblookup_hash(&udbinfo, &addrs[1].sin6_addr,
- addrs[1].sin6_port,
- &addrs[0].sin6_addr, addrs[0].sin6_port,
- 1, NULL);
- if (!inp || !inp->inp_socket || !inp->inp_socket->so_cred) {
- error = ENOENT;
- goto out;
- }
- error = SYSCTL_OUT(req, inp->inp_socket->so_cred->pc_ucred,
- sizeof(struct ucred));
-
-out:
- splx(s);
- return (error);
+ (void) in6_pcbnotify(&udbinfo, sa, uh.uh_dport,
+ (struct sockaddr*)ip6cp->ip6c_src, uh.uh_sport,
+ cmd, NULL, notify);
+ }
+ /*
+ * XXX The else condition here was broken for a long time.
+ * Fixing it made us deliver notification correctly but broke
+ * some frameworks that didn't handle it well.
+ * For now we have removed it and will revisit it later.
+ */
}
-SYSCTL_PROC(_net_inet6_udp6, OID_AUTO, getcred, CTLTYPE_OPAQUE|CTLFLAG_RW,
- 0, 0,
- udp6_getcred, "S,ucred", "Get the ucred of a UDP6 connection");
-#endif
-
static int
udp6_abort(struct socket *so)
{
struct inpcb *inp;
- int s;
inp = sotoinpcb(so);
- if (inp == 0)
- return EINVAL; /* ??? possible? panic instead? */
+ if (inp == NULL) {
+ panic("%s: so=%p null inp\n", __func__, so);
+ /* NOTREACHED */
+ }
soisdisconnected(so);
- s = splnet();
in6_pcbdetach(inp);
- splx(s);
return 0;
}
static int
udp6_attach(struct socket *so, int proto, struct proc *p)
{
+#pragma unused(proto)
struct inpcb *inp;
- int s, error;
+ int error;
inp = sotoinpcb(so);
- if (inp != 0)
+ if (inp != NULL) {
return EINVAL;
+ }
+
+ error = in_pcballoc(so, &udbinfo, p);
+ if (error) {
+ return error;
+ }
if (so->so_snd.sb_hiwat == 0 || so->so_rcv.sb_hiwat == 0) {
error = soreserve(so, udp_sendspace, udp_recvspace);
- if (error)
+ if (error) {
return error;
+ }
}
- s = splnet();
- error = in_pcballoc(so, &udbinfo, p);
- splx(s);
- if (error)
- return error;
inp = (struct inpcb *)so->so_pcb;
inp->inp_vflag |= INP_IPV6;
- inp->in6p_hops = -1; /* use kernel default */
- inp->in6p_cksum = -1; /* just to be sure */
+ if (ip6_mapped_addr_on) {
+ inp->inp_vflag |= INP_IPV4;
+ }
+ inp->in6p_hops = -1; /* use kernel default */
+ inp->in6p_cksum = -1; /* just to be sure */
/*
* XXX: ugly!!
* IPv4 TTL initialization is necessary for an IPv6 socket as well,
* which may match an IPv4-mapped IPv6 address.
*/
inp->inp_ip_ttl = ip_defttl;
+ if (nstat_collect) {
+ nstat_udp_new_pcb(inp);
+ }
return 0;
}
udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
- int s, error;
+ int error;
inp = sotoinpcb(so);
- if (inp == 0)
+ if (inp == NULL) {
return EINVAL;
+ }
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
struct sockaddr_in6 *sin6_p;
- sin6_p = (struct sockaddr_in6 *)nam;
+ sin6_p = (struct sockaddr_in6 *)(void *)nam;
- if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr))
+ if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
inp->inp_vflag |= INP_IPV4;
- else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
+ } else if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
struct sockaddr_in sin;
in6_sin6_2_sin(&sin, sin6_p);
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
- s = splnet();
error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
- splx(s);
return error;
}
}
- s = splnet();
error = in6_pcbbind(inp, nam, p);
- splx(s);
return error;
}
-static int
+int
udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
- int s, error;
+ int error;
+#if defined(NECP) && defined(FLOW_DIVERT)
+ int should_use_flow_divert = 0;
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
inp = sotoinpcb(so);
- if (inp == 0)
+ if (inp == NULL) {
return EINVAL;
+ }
+
+#if defined(NECP) && defined(FLOW_DIVERT)
+ should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
struct sockaddr_in6 *sin6_p;
- sin6_p = (struct sockaddr_in6 *)nam;
+ sin6_p = (struct sockaddr_in6 *)(void *)nam;
if (IN6_IS_ADDR_V4MAPPED(&sin6_p->sin6_addr)) {
struct sockaddr_in sin;
- if (inp->inp_faddr.s_addr != INADDR_ANY)
+ if (inp->inp_faddr.s_addr != INADDR_ANY) {
return EISCONN;
+ }
+
+ if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
+ so->so_flags1 |= SOF1_CONNECT_COUNTED;
+ INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet_dgram_connected);
+ }
+
in6_sin6_2_sin(&sin, sin6_p);
- s = splnet();
- error = in_pcbconnect(inp, (struct sockaddr *)&sin, p);
- splx(s);
+#if defined(NECP) && defined(FLOW_DIVERT)
+ if (should_use_flow_divert) {
+ goto do_flow_divert;
+ }
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
+ error = in_pcbconnect(inp, (struct sockaddr *)&sin,
+ p, IFSCOPE_NONE, NULL);
if (error == 0) {
+#if NECP
+ /* Update NECP client with connected five-tuple */
+ if (!uuid_is_null(inp->necp_client_uuid)) {
+ socket_unlock(so, 0);
+ necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
+ socket_lock(so, 0);
+ }
+#endif /* NECP */
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
soisconnected(so);
}
}
- if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
+ if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
return EISCONN;
- s = splnet();
+ }
+
+ if (!(so->so_flags1 & SOF1_CONNECT_COUNTED)) {
+ so->so_flags1 |= SOF1_CONNECT_COUNTED;
+ INC_ATOMIC_INT64_LIM(net_api_stats.nas_socket_inet6_dgram_connected);
+ }
+
+#if defined(NECP) && defined(FLOW_DIVERT)
+do_flow_divert:
+ if (should_use_flow_divert) {
+ uint32_t fd_ctl_unit = necp_socket_get_flow_divert_control_unit(inp);
+ if (fd_ctl_unit > 0) {
+ error = flow_divert_pcb_init(so, fd_ctl_unit);
+ if (error == 0) {
+ error = flow_divert_connect_out(so, nam, p);
+ }
+ } else {
+ error = ENETDOWN;
+ }
+ return error;
+ }
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
+
error = in6_pcbconnect(inp, nam, p);
- splx(s);
if (error == 0) {
- if (ip6_mapped_addr_on) { /* should be non mapped addr */
+ /* should be non mapped addr */
+ if (ip6_mapped_addr_on ||
+ (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
}
+#if NECP
+ /* Update NECP client with connected five-tuple */
+ if (!uuid_is_null(inp->necp_client_uuid)) {
+ socket_unlock(so, 0);
+ necp_client_assign_from_socket(so->last_pid, inp->necp_client_uuid, inp);
+ socket_lock(so, 0);
+ }
+#endif /* NECP */
soisconnected(so);
+ if (inp->inp_flowhash == 0) {
+ inp->inp_flowhash = inp_calc_flowhash(inp);
+ }
+ /* update flowinfo - RFC 6437 */
+ if (inp->inp_flow == 0 &&
+ inp->in6p_flags & IN6P_AUTOFLOWLABEL) {
+ inp->inp_flow &= ~IPV6_FLOWLABEL_MASK;
+ inp->inp_flow |=
+ (htonl(inp->inp_flowhash) & IPV6_FLOWLABEL_MASK);
+ }
}
return error;
}
+static int
+udp6_connectx(struct socket *so, struct sockaddr *src,
+ struct sockaddr *dst, struct proc *p, uint32_t ifscope,
+ sae_associd_t aid, sae_connid_t *pcid, uint32_t flags, void *arg,
+ uint32_t arglen, struct uio *uio, user_ssize_t *bytes_written)
+{
+ return udp_connectx_common(so, AF_INET6, src, dst,
+ p, ifscope, aid, pcid, flags, arg, arglen, uio, bytes_written);
+}
+
static int
udp6_detach(struct socket *so)
{
struct inpcb *inp;
- int s;
inp = sotoinpcb(so);
- if (inp == 0)
+ if (inp == NULL) {
return EINVAL;
- s = splnet();
+ }
in6_pcbdetach(inp);
- splx(s);
return 0;
}
udp6_disconnect(struct socket *so)
{
struct inpcb *inp;
- int s;
inp = sotoinpcb(so);
- if (inp == 0)
- return EINVAL;
+ if (inp == NULL
+#if NECP
+ || (necp_socket_should_use_flow_divert(inp))
+#endif /* NECP */
+ ) {
+ return inp == NULL ? EINVAL : EPROTOTYPE;
+ }
if (inp->inp_vflag & INP_IPV4) {
struct pr_usrreqs *pru;
pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
- return ((*pru->pru_disconnect)(so));
+ return (*pru->pru_disconnect)(so);
}
- if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
+ if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
return ENOTCONN;
+ }
- s = splnet();
in6_pcbdisconnect(inp);
+
+ /* reset flow-controlled state, just in case */
+ inp_reset_fc_state(inp);
+
inp->in6p_laddr = in6addr_any;
- splx(s);
- so->so_state &= ~SS_ISCONNECTED; /* XXX */
+ inp->in6p_last_outifp = NULL;
+
+ so->so_state &= ~SS_ISCONNECTED; /* XXX */
return 0;
}
+static int
+udp6_disconnectx(struct socket *so, sae_associd_t aid, sae_connid_t cid)
+{
+#pragma unused(cid)
+ if (aid != SAE_ASSOCID_ANY && aid != SAE_ASSOCID_ALL) {
+ return EINVAL;
+ }
+
+ return udp6_disconnect(so);
+}
+
static int
udp6_send(struct socket *so, int flags, struct mbuf *m, struct sockaddr *addr,
- struct mbuf *control, struct proc *p)
+ struct mbuf *control, struct proc *p)
{
struct inpcb *inp;
int error = 0;
+#if defined(NECP) && defined(FLOW_DIVERT)
+ int should_use_flow_divert = 0;
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
+#if CONTENT_FILTER
+ struct m_tag *cfil_tag = NULL;
+ struct sockaddr *cfil_faddr = NULL;
+#endif
inp = sotoinpcb(so);
- if (inp == 0) {
+ if (inp == NULL) {
error = EINVAL;
goto bad;
}
- if (addr) {
- if (addr->sa_len != sizeof(struct sockaddr_in6)) {
+#if CONTENT_FILTER
+ //If socket is subject to UDP Content Filter and unconnected, get addr from tag.
+ if (so->so_cfil_db && !addr && IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr)) {
+ cfil_tag = cfil_udp_get_socket_state(m, NULL, NULL, &cfil_faddr);
+ if (cfil_tag) {
+ addr = (struct sockaddr *)cfil_faddr;
+ }
+ }
+#endif
+
+#if defined(NECP) && defined(FLOW_DIVERT)
+ should_use_flow_divert = necp_socket_should_use_flow_divert(inp);
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
+
+ if (addr != NULL) {
+ if (addr->sa_len != sizeof(struct sockaddr_in6)) {
error = EINVAL;
goto bad;
}
}
}
- if (ip6_mapped_addr_on) {
+ if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
int hasv4addr;
- struct sockaddr_in6 *sin6 = 0;
+ struct sockaddr_in6 *sin6 = NULL;
- if (addr == 0)
+ if (addr == NULL) {
hasv4addr = (inp->inp_vflag & INP_IPV4);
- else {
- sin6 = (struct sockaddr_in6 *)addr;
- hasv4addr = IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr)
- ? 1 : 0;
+ } else {
+ sin6 = (struct sockaddr_in6 *)(void *)addr;
+ hasv4addr =
+ IN6_IS_ADDR_V4MAPPED(&sin6->sin6_addr) ? 1 : 0;
}
if (hasv4addr) {
struct pr_usrreqs *pru;
- if (sin6)
+ if (sin6 != NULL) {
in6_sin6_2_sin_in_sock(addr);
+ }
+#if defined(NECP) && defined(FLOW_DIVERT)
+ if (should_use_flow_divert) {
+ goto do_flow_divert;
+ }
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
- error = ((*pru->pru_send)(so, flags, m, addr, control,
- p));
+ error = ((*pru->pru_send)(so, flags, m, addr,
+ control, p));
+#if CONTENT_FILTER
+ if (cfil_tag) {
+ m_tag_free(cfil_tag);
+ }
+#endif
/* addr will just be freed in sendit(). */
return error;
}
}
- return udp6_output(inp, m, addr, control, p);
+#if defined(NECP) && defined(FLOW_DIVERT)
+do_flow_divert:
+ if (should_use_flow_divert) {
+ /* Implicit connect */
+ error = flow_divert_implicit_data_out(so, flags, m, addr, control, p);
+#if CONTENT_FILTER
+ if (cfil_tag) {
+ m_tag_free(cfil_tag);
+ }
+#endif
+ return error;
+ }
+#endif /* defined(NECP) && defined(FLOW_DIVERT) */
+
+ error = udp6_output(inp, m, addr, control, p);
+#if CONTENT_FILTER
+ if (cfil_tag) {
+ m_tag_free(cfil_tag);
+ }
+#endif
+ return error;
+
+bad:
+ VERIFY(error != 0);
- bad:
- m_freem(m);
- return(error);
+ if (m != NULL) {
+ m_freem(m);
+ }
+ if (control != NULL) {
+ m_freem(control);
+ }
+#if CONTENT_FILTER
+ if (cfil_tag) {
+ m_tag_free(cfil_tag);
+ }
+#endif
+ return error;
}
-struct pr_usrreqs udp6_usrreqs = {
- udp6_abort, pru_accept_notsupp, udp6_attach, udp6_bind, udp6_connect,
- pru_connect2_notsupp, in6_control, udp6_detach, udp6_disconnect,
- pru_listen_notsupp, in6_mapped_peeraddr, pru_rcvd_notsupp,
- pru_rcvoob_notsupp, udp6_send, pru_sense_null, udp_shutdown,
- in6_mapped_sockaddr, sosend, soreceive, sopoll
-};
+/*
+ * Checksum extended UDP header and data.
+ */
+static int
+udp6_input_checksum(struct mbuf *m, struct udphdr *uh, int off, int ulen)
+{
+ struct ifnet *ifp = m->m_pkthdr.rcvif;
+ struct ip6_hdr *ip6 = mtod(m, struct ip6_hdr *);
+
+ if (!(m->m_pkthdr.csum_flags & CSUM_DATA_VALID) &&
+ uh->uh_sum == 0) {
+ /* UDP/IPv6 checksum is mandatory (RFC2460) */
+
+ /*
+ * If checksum was already validated, ignore this check.
+ * This is necessary for transport-mode ESP, which may be
+ * getting UDP payloads without checksums when the network
+ * has a NAT64.
+ */
+ udpstat.udps_nosum++;
+ goto badsum;
+ }
+
+ if ((hwcksum_rx || (ifp->if_flags & IFF_LOOPBACK) ||
+ (m->m_pkthdr.pkt_flags & PKTF_LOOP)) &&
+ (m->m_pkthdr.csum_flags & CSUM_DATA_VALID)) {
+ if (m->m_pkthdr.csum_flags & CSUM_PSEUDO_HDR) {
+ uh->uh_sum = m->m_pkthdr.csum_rx_val;
+ } else {
+ uint32_t sum = m->m_pkthdr.csum_rx_val;
+ uint32_t start = m->m_pkthdr.csum_rx_start;
+ int32_t trailer = (m_pktlen(m) - (off + ulen));
+
+ /*
+ * Perform 1's complement adjustment of octets
+ * that got included/excluded in the hardware-
+ * calculated checksum value. Also take care
+ * of any trailing bytes and subtract out
+ * their partial sum.
+ */
+ ASSERT(trailer >= 0);
+ if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) &&
+ (start != off || trailer != 0)) {
+ uint32_t swbytes = (uint32_t)trailer;
+ uint16_t s = 0, d = 0;
+
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
+ s = ip6->ip6_src.s6_addr16[1];
+ ip6->ip6_src.s6_addr16[1] = 0;
+ }
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
+ d = ip6->ip6_dst.s6_addr16[1];
+ ip6->ip6_dst.s6_addr16[1] = 0;
+ }
+
+ /* callee folds in sum */
+ sum = m_adj_sum16(m, start, off, ulen, sum);
+ if (off > start) {
+ swbytes += (off - start);
+ } else {
+ swbytes += (start - off);
+ }
+
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_src)) {
+ ip6->ip6_src.s6_addr16[1] = s;
+ }
+ if (IN6_IS_SCOPE_EMBED(&ip6->ip6_dst)) {
+ ip6->ip6_dst.s6_addr16[1] = d;
+ }
+
+ if (swbytes != 0) {
+ udp_in_cksum_stats(swbytes);
+ }
+ if (trailer != 0) {
+ m_adj(m, -trailer);
+ }
+ }
+
+ uh->uh_sum = in6_pseudo(&ip6->ip6_src, &ip6->ip6_dst,
+ sum + htonl(ulen + IPPROTO_UDP));
+ }
+ uh->uh_sum ^= 0xffff;
+ } else {
+ udp_in6_cksum_stats(ulen);
+ uh->uh_sum = in6_cksum(m, IPPROTO_UDP, off, ulen);
+ }
+
+ if (uh->uh_sum != 0) {
+badsum:
+ udpstat.udps_badsum++;
+ IF_UDP_STATINC(ifp, badchksum);
+ return -1;
+ }
+
+ return 0;
+}
projects / apple / xnu.git / blobdiff