#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/mbuf.h>
#include <sys/protosw.h>
#include <sys/socket.h>
#include <sys/socketvar.h>
#include <sys/sysctl.h>
#include <sys/errno.h>
#include <sys/stat.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 <netinet/in.h>
#include <netinet/in_systm.h>
#include <netinet/ip.h>
#include <netinet/in_pcb.h>
#include <netinet/in_var.h>
#include <netinet/ip_var.h>
#include <netinet/udp.h>
#include <netinet/udp_var.h>
#include <netinet/ip6.h>
#include <netinet6/ip6_var.h>
#include <netinet6/in6_pcb.h>
#include <netinet/icmp6.h>
#include <netinet6/udp6_var.h>
#include <netinet6/ip6protosw.h>
#if IPSEC
#include <netinet6/ipsec.h>
#include <netinet6/ipsec6.h>
#endif
#if NECP
#include <net/necp.h>
#endif
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_list **,
struct sockaddr_list **, struct proc *, uint32_t, associd_t, connid_t *,
uint32_t, void *, uint32_t);
static int udp6_detach(struct socket *);
static int udp6_disconnect(struct socket *);
static int udp6_disconnectx(struct socket *, associd_t, 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 IPFIREWALL
extern int fw_verbose;
extern void ipfwsyslog( int level, const char *format,...);
extern void ipfw_stealth_stats_incr_udpv6(void);
#define log_in_vain_log(a) { \
if ((udp_log_in_vain == 3) && (fw_verbose == 2)) { \
ipfwsyslog a; \
} else if ((udp_log_in_vain == 4) && (fw_verbose == 2)) { \
ipfw_stealth_stats_incr_udpv6(); \
} else { \
log a; \
} \
}
#else
#define log_in_vain_log( a ) { log a; }
#endif
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,
};
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
if ((last->in6p_flags & INP_CONTROLOPTS) != 0 ||
(last->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
(last->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 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);
}
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);
}
int
udp6_input(struct mbuf **mp, int *offp, int proto)
{
#pragma unused(proto)
struct mbuf *m = *mp;
struct ifnet *ifp;
struct ip6_hdr *ip6;
struct udphdr *uh;
struct inpcb *in6p;
struct mbuf *opts = NULL;
int off = *offp;
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), return IPPROTO_DONE);
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
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 *)(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;
}
if (uh->uh_dport == 0) {
IF_UDP_STATINC(ifp, port0);
goto bad;
}
if (udp6_input_checksum(m, uh, off, ulen))
goto bad;
init_sin6(&fromsa, m);
fromsa.sin6_port = uh->uh_sport;
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
int reuse_sock = 0, mcast_delivered = 0;
struct ip6_moptions *imo;
init_sin6(&udp_in6, m);
udp_in6.sin6_port = uh->uh_sport;
lck_rw_lock_shared(pcbinfo->ipi_lock);
LIST_FOREACH(in6p, &udb, inp_list) {
#if IPSEC
int skipit;
#endif
if ((in6p->inp_vflag & INP_IPV6) == 0)
continue;
if (inp_restricted_recv(in6p, ifp))
continue;
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;
}
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,
(struct sockaddr *)&mcaddr,
(struct sockaddr *)&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;
}
reuse_sock = in6p->inp_socket->so_options &
(SO_REUSEPORT | SO_REUSEADDR);
#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)) {
skipit = 1;
}
if (skipit == 0)
#endif
{
struct mbuf *n = 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;
}
udp_unlock(in6p->in6p_socket, 1, 0);
if (reuse_sock == 0 || m == NULL)
break;
MBUF_STRICT_DATA_ALIGNMENT_CHECK_32(m);
ip6 = mtod(m, struct ip6_hdr *);
uh = (struct udphdr *)(void *)((caddr_t)ip6 + off);
}
lck_rw_done(pcbinfo->ipi_lock);
if (mcast_delivered == 0) {
udpstat.udps_noport++;
udpstat.udps_noportmcast++;
IF_UDP_STATINC(ifp, port_unreach);
goto bad;
}
if (m != NULL)
m_freem(m);
return (IPPROTO_DONE);
}
in6p = in6_pcblookup_hash(&udbinfo, &ip6->ip6_src, uh->uh_sport,
&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];
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_in_vain_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");
udpstat.udps_noportmcast++;
IF_UDP_STATINC(ifp, badmcast);
goto bad;
}
icmp6_error(m, ICMP6_DST_UNREACH, ICMP6_DST_UNREACH_NOPORT, 0);
return (IPPROTO_DONE);
}
#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)) {
in_pcb_checkstate(in6p, WNT_RELEASE, 0);
IF_UDP_STATINC(ifp, badipsec);
goto bad;
}
#endif
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);
udp_in6.sin6_port = uh->uh_sport;
if ((in6p->in6p_flags & INP_CONTROLOPTS) != 0 ||
(in6p->in6p_socket->so_options & SO_TIMESTAMP) != 0 ||
(in6p->in6p_socket->so_options & SO_TIMESTAMP_MONOTONIC) != 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);
}
so_recv_data_stat(in6p->in6p_socket, m, 0);
if (sbappendaddr(&in6p->in6p_socket->so_rcv,
(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 != NULL)
m_freem(m);
if (opts != NULL)
m_freem(opts);
return (IPPROTO_DONE);
}
void
udp6_ctlinput(int cmd, struct sockaddr *sa, void *d)
{
struct udphdr uh;
struct ip6_hdr *ip6;
struct mbuf *m;
int off = 0;
struct ip6ctlparam *ip6cp = NULL;
const struct sockaddr_in6 *sa6_src = NULL;
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))
return;
if ((unsigned)cmd >= PRC_NCMDS)
return;
if (PRC_IS_REDIRECT(cmd))
notify = in6_rtchange, d = NULL;
else if (cmd == PRC_HOSTDEAD)
d = NULL;
else if (inet6ctlerrmap[cmd] == 0)
return;
if (d != NULL) {
ip6cp = (struct ip6ctlparam *)d;
m = ip6cp->ip6c_m;
ip6 = ip6cp->ip6c_ip6;
off = ip6cp->ip6c_off;
sa6_src = ip6cp->ip6c_src;
} else {
m = NULL;
ip6 = NULL;
sa6_src = &sa6_any;
}
if (ip6 != NULL) {
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(&udbinfo, sa, uh.uh_dport,
(struct sockaddr*)ip6cp->ip6c_src, uh.uh_sport,
cmd, NULL, notify);
} else {
(void) in6_pcbnotify(&udbinfo, sa, 0,
(struct sockaddr *)&sa6_src, 0, cmd, NULL, notify);
}
}
static int
udp6_abort(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == NULL) {
panic("%s: so=%p null inp\n", __func__, so);
}
soisdisconnected(so);
in6_pcbdetach(inp);
return (0);
}
static int
udp6_attach(struct socket *so, int proto, struct proc *p)
{
#pragma unused(proto)
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
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)
return (error);
}
inp = (struct inpcb *)so->so_pcb;
inp->inp_vflag |= INP_IPV6;
if (ip6_mapped_addr_on)
inp->inp_vflag |= INP_IPV4;
inp->in6p_hops = -1;
inp->in6p_cksum = -1;
inp->inp_ip_ttl = ip_defttl;
if (nstat_collect)
nstat_udp_new_pcb(inp);
return (0);
}
static int
udp6_bind(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif
)
return (inp == NULL ? EINVAL : EPROTOTYPE);
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 *)(void *)nam;
if (IN6_IS_ADDR_UNSPECIFIED(&sin6_p->sin6_addr)) {
inp->inp_vflag |= INP_IPV4;
} 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;
error = in_pcbbind(inp, (struct sockaddr *)&sin, p);
return (error);
}
}
error = in6_pcbbind(inp, nam, p);
return (error);
}
int
udp6_connect(struct socket *so, struct sockaddr *nam, struct proc *p)
{
struct inpcb *inp;
int error;
inp = sotoinpcb(so);
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif
)
return (inp == NULL ? EINVAL : EPROTOTYPE);
if ((inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
struct sockaddr_in6 *sin6_p;
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)
return (EISCONN);
in6_sin6_2_sin(&sin, sin6_p);
error = in_pcbconnect(inp, (struct sockaddr *)&sin,
p, IFSCOPE_NONE, NULL);
if (error == 0) {
inp->inp_vflag |= INP_IPV4;
inp->inp_vflag &= ~INP_IPV6;
soisconnected(so);
}
return (error);
}
}
if (!IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return (EISCONN);
error = in6_pcbconnect(inp, nam, p);
if (error == 0) {
if (ip6_mapped_addr_on ||
(inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
inp->inp_vflag &= ~INP_IPV4;
inp->inp_vflag |= INP_IPV6;
}
soisconnected(so);
if (inp->inp_flowhash == 0)
inp->inp_flowhash = inp_calc_flowhash(inp);
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_list **src_sl,
struct sockaddr_list **dst_sl, struct proc *p, uint32_t ifscope,
associd_t aid, connid_t *pcid, uint32_t flags, void *arg,
uint32_t arglen)
{
return (udp_connectx_common(so, AF_INET6, src_sl, dst_sl,
p, ifscope, aid, pcid, flags, arg, arglen));
}
static int
udp6_detach(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == NULL)
return (EINVAL);
in6_pcbdetach(inp);
return (0);
}
static int
udp6_disconnect(struct socket *so)
{
struct inpcb *inp;
inp = sotoinpcb(so);
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif
)
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));
}
if (IN6_IS_ADDR_UNSPECIFIED(&inp->in6p_faddr))
return (ENOTCONN);
in6_pcbdisconnect(inp);
inp_reset_fc_state(inp);
inp->in6p_laddr = in6addr_any;
inp->in6p_last_outifp = NULL;
so->so_state &= ~SS_ISCONNECTED;
return (0);
}
static int
udp6_disconnectx(struct socket *so, associd_t aid, connid_t cid)
{
#pragma unused(cid)
if (aid != ASSOCID_ANY && aid != 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 inpcb *inp;
int error = 0;
inp = sotoinpcb(so);
if (inp == NULL
#if NECP
|| (necp_socket_should_use_flow_divert(inp))
#endif
) {
if (inp == NULL)
error = EINVAL;
else
error = EPROTOTYPE;
goto bad;
}
if (addr != NULL) {
if (addr->sa_len != sizeof (struct sockaddr_in6)) {
error = EINVAL;
goto bad;
}
if (addr->sa_family != AF_INET6) {
error = EAFNOSUPPORT;
goto bad;
}
}
if (ip6_mapped_addr_on || (inp->inp_flags & IN6P_IPV6_V6ONLY) == 0) {
int hasv4addr;
struct sockaddr_in6 *sin6 = NULL;
if (addr == NULL) {
hasv4addr = (inp->inp_vflag & INP_IPV4);
} 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 != NULL)
in6_sin6_2_sin_in_sock(addr);
pru = ip_protox[IPPROTO_UDP]->pr_usrreqs;
error = ((*pru->pru_send)(so, flags, m, addr,
control, p));
return (error);
}
}
return (udp6_output(inp, m, addr, control, p));
bad:
VERIFY(error != 0);
if (m != NULL)
m_freem(m);
if (control != NULL)
m_freem(control);
return (error);
}
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 (uh->uh_sum == 0) {
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 {
uint16_t sum = m->m_pkthdr.csum_rx_val;
uint16_t start = m->m_pkthdr.csum_rx_start;
if ((m->m_pkthdr.csum_flags & CSUM_PARTIAL) &&
start != off) {
uint16_t s, d;
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;
}
sum = m_adj_sum16(m, start, off, sum);
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;
}
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);
}