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Break out socket access control and delivery logic from udp6_input()

Browse source 
into its own function, udp6_append().  This mirrors a similar structure
in udp_input() and udp_append(), and makes the whole thing a lot more
readable.

While here, add missing inpcb locking in UDP6 input path.

Reviewed by:	bz
MFC after:	3 months
This commit is contained in:
Robert Watson 2006-05-01 21:39:48 +00:00
parent 4ac60df584
commit 20e3d71cdd
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=158237
1 changed files with 55 additions and 96 deletions
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151
sys/netinet6/udp6_usrreq.c
View file

@ -119,12 +119,53 @@
extern struct protosw inetsw[];
static void udp6_detach __P((struct socket *so));
static void
udp6_append(struct inpcb *in6p, struct mbuf *n, int off,
struct sockaddr_in6 *fromsa)
{
struct socket *so;
struct mbuf *opts;
/* XXXRW: Not yet: INP_LOCK_ASSERT(in6p); */
#if defined(IPSEC) || defined(FAST_IPSEC)
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject(n, in6p)) {
m_freem(n);
#ifdef IPSEC
ipsec6stat.in_polvio++;
#endif /* IPSEC */
return;
}
#endif /*IPSEC || FAST_IPSEC*/
opts = NULL;
if (in6p->in6p_flags & IN6P_CONTROLOPTS ||
in6p->inp_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(in6p, n, &opts);
m_adj(n, off + sizeof(struct udphdr));
so = in6p->inp_socket;
SOCKBUF_LOCK(&so->so_rcv);
if (sbappendaddr_locked(&so->so_rcv, (struct sockaddr *)fromsa, n,
opts) == 0) {
SOCKBUF_UNLOCK(&so->so_rcv);
m_freem(n);
if (opts)
m_freem(opts);
udpstat.udps_fullsock++;
} else
sorwakeup_locked(so);
}
int
udp6_input(mp, offp, proto)
struct mbuf **mp;
int *offp, proto;
{
struct mbuf *m = *mp, *opts;
struct mbuf *m = *mp;
register struct ip6_hdr *ip6;
register struct udphdr *uh;
register struct inpcb *in6p;
@ -132,8 +173,6 @@ udp6_input(mp, offp, proto)
int plen, ulen;
struct sockaddr_in6 fromsa;
opts = NULL;
ip6 = mtod(m, struct ip6_hdr *);
if (faithprefix_p != NULL && (*faithprefix_p)(&ip6->ip6_dst)) {
@ -174,6 +213,12 @@ udp6_input(mp, offp, proto)
goto bad_unlocked;
}
/*
* Construct sockaddr format source address.
*/
init_sin6(&fromsa, m);
fromsa.sin6_port = uh->uh_sport;
INP_INFO_RLOCK(&udbinfo);
if (IN6_IS_ADDR_MULTICAST(&ip6->ip6_dst)) {
struct inpcb *last;
@ -204,11 +249,6 @@ udp6_input(mp, offp, proto)
* matches one of the multicast groups specified in the socket.
*/
/*
* Construct sockaddr format source address.
*/
init_sin6(&fromsa, m);
fromsa.sin6_port = uh->uh_sport;
/*
* KAME note: traditionally we dropped udpiphdr from mbuf here.
* We need udphdr for IPsec processing so we do that later.
@ -242,40 +282,10 @@ udp6_input(mp, offp, proto)
if (last != NULL) {
struct mbuf *n;
#if defined(IPSEC) || defined(FAST_IPSEC)
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject(m, last)) {
#ifdef IPSEC
ipsec6stat.in_polvio++;
#endif /* IPSEC */
/* do not inject data into pcb */
} else
#endif /*IPSEC || FAST_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, n, &opts);
m_adj(n, off + sizeof(struct udphdr));
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&fromsa,
n, opts) == 0) {
m_freem(n);
if (opts)
m_freem(opts);
udpstat.udps_fullsock++;
} else
sorwakeup(last->in6p_socket);
opts = NULL;
INP_LOCK(in6p);
udp6_append(in6p, n, off, &fromsa);
INP_UNLOCK(in6p);
}
}
last = in6p;
@ -302,29 +312,9 @@ udp6_input(mp, offp, proto)
udpstat.udps_noportmcast++;
goto bad;
}
#if defined(IPSEC) || defined(FAST_IPSEC)
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject(m, last)) {
#ifdef IPSEC
ipsec6stat.in_polvio++;
#endif /* IPSEC */
goto bad;
}
#endif /*IPSEC || FAST_IPSEC*/
if (last->in6p_flags & IN6P_CONTROLOPTS
|| last->in6p_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(last, m, &opts);
m_adj(m, off + sizeof(struct udphdr));
if (sbappendaddr(&last->in6p_socket->so_rcv,
(struct sockaddr *)&fromsa,
m, opts) == 0) {
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(last->in6p_socket);
INP_LOCK(last);
udp6_append(last, m, off, &fromsa);
INP_UNLOCK(last);
INP_INFO_RUNLOCK(&udbinfo);
return IPPROTO_DONE;
}
@ -355,36 +345,7 @@ udp6_input(mp, offp, proto)
return IPPROTO_DONE;
}
INP_LOCK(in6p);
#if defined(IPSEC) || defined(FAST_IPSEC)
/*
* Check AH/ESP integrity.
*/
if (ipsec6_in_reject(m, in6p)) {
INP_UNLOCK(in6p);
#ifdef IPSEC
ipsec6stat.in_polvio++;
#endif /* IPSEC */
goto bad;
}
#endif /*IPSEC || FAST_IPSEC*/
/*
* Construct sockaddr format source address.
* Stuff source address and datagram in user buffer.
*/
init_sin6(&fromsa, m);
fromsa.sin6_port = uh->uh_sport;
if (in6p->in6p_flags & IN6P_CONTROLOPTS
|| in6p->in6p_socket->so_options & SO_TIMESTAMP)
ip6_savecontrol(in6p, m, &opts);
m_adj(m, off + sizeof(struct udphdr));
if (sbappendaddr(&in6p->in6p_socket->so_rcv,
(struct sockaddr *)&fromsa, m, opts) == 0) {
INP_UNLOCK(in6p);
udpstat.udps_fullsock++;
goto bad;
}
sorwakeup(in6p->in6p_socket);
udp6_append(in6p, m, off, &fromsa);
INP_UNLOCK(in6p);
INP_INFO_RUNLOCK(&udbinfo);
return IPPROTO_DONE;
@ -393,8 +354,6 @@ udp6_input(mp, offp, proto)
bad_unlocked:
if (m)
m_freem(m);
if (opts)
m_freem(opts);
return IPPROTO_DONE;
}