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-rw-r--r--sys/netinet/ip_output.c91
1 files changed, 58 insertions, 33 deletions
diff --git a/sys/netinet/ip_output.c b/sys/netinet/ip_output.c
index 0a43b2d..90c50a3 100644
--- a/sys/netinet/ip_output.c
+++ b/sys/netinet/ip_output.c
@@ -99,6 +99,7 @@ static void ip_mloopback
static int ip_getmoptions(struct inpcb *, struct sockopt *);
static int ip_pcbopts(struct inpcb *, int, struct mbuf *);
static int ip_setmoptions(struct inpcb *, struct sockopt *);
+static struct ip_moptions *ip_findmoptions(struct inpcb *inp);
int ip_optcopy(struct ip *, struct ip *);
@@ -1569,6 +1570,39 @@ ip_multicast_if(a, ifindexp)
}
/*
+ * Given an inpcb, return its multicast options structure pointer. Accepts
+ * an unlocked inpcb pointer, but will return it locked. May sleep.
+ */
+static struct ip_moptions *
+ip_findmoptions(struct inpcb *inp)
+{
+ struct ip_moptions *imo;
+
+ INP_LOCK(inp);
+ if (inp->inp_moptions != NULL)
+ return (inp->inp_moptions);
+
+ INP_UNLOCK(inp);
+
+ imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS, M_WAITOK);
+
+ imo->imo_multicast_ifp = NULL;
+ imo->imo_multicast_addr.s_addr = INADDR_ANY;
+ imo->imo_multicast_vif = -1;
+ imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
+ imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
+ imo->imo_num_memberships = 0;
+
+ INP_LOCK(inp);
+ if (inp->inp_moptions != NULL) {
+ free(imo, M_IPMOPTS);
+ return (inp->inp_moptions);
+ }
+ inp->inp_moptions = imo;
+ return (imo);
+}
+
+/*
* Set the IP multicast options in response to user setsockopt().
*/
static int
@@ -1585,26 +1619,6 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
int ifindex;
int s;
- imo = inp->inp_moptions;
- if (imo == NULL) {
- /*
- * No multicast option buffer attached to the pcb;
- * allocate one and initialize to default values.
- */
- imo = (struct ip_moptions*)malloc(sizeof(*imo), M_IPMOPTS,
- M_WAITOK);
-
- if (imo == NULL)
- return (ENOBUFS);
- inp->inp_moptions = imo;
- imo->imo_multicast_ifp = NULL;
- imo->imo_multicast_addr.s_addr = INADDR_ANY;
- imo->imo_multicast_vif = -1;
- imo->imo_multicast_ttl = IP_DEFAULT_MULTICAST_TTL;
- imo->imo_multicast_loop = IP_DEFAULT_MULTICAST_LOOP;
- imo->imo_num_memberships = 0;
- }
-
switch (sopt->sopt_name) {
/* store an index number for the vif you wanna use in the send */
case IP_MULTICAST_VIF:
@@ -1619,7 +1633,9 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
error = EINVAL;
break;
}
+ imo = ip_findmoptions(inp);
imo->imo_multicast_vif = i;
+ INP_UNLOCK(inp);
break;
case IP_MULTICAST_IF:
@@ -1634,8 +1650,10 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
* When no interface is selected, a default one is
* chosen every time a multicast packet is sent.
*/
+ imo = ip_findmoptions(inp);
if (addr.s_addr == INADDR_ANY) {
imo->imo_multicast_ifp = NULL;
+ INP_UNLOCK(inp);
break;
}
/*
@@ -1646,6 +1664,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
s = splimp();
ifp = ip_multicast_if(&addr, &ifindex);
if (ifp == NULL || (ifp->if_flags & IFF_MULTICAST) == 0) {
+ INP_UNLOCK(inp);
splx(s);
error = EADDRNOTAVAIL;
break;
@@ -1655,6 +1674,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
imo->imo_multicast_addr = addr;
else
imo->imo_multicast_addr.s_addr = INADDR_ANY;
+ INP_UNLOCK(inp);
splx(s);
break;
@@ -1670,7 +1690,9 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
error = sooptcopyin(sopt, &ttl, 1, 1);
if (error)
break;
+ imo = ip_findmoptions(inp);
imo->imo_multicast_ttl = ttl;
+ INP_UNLOCK(inp);
} else {
u_int ttl;
error = sooptcopyin(sopt, &ttl, sizeof ttl,
@@ -1679,8 +1701,11 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
break;
if (ttl > 255)
error = EINVAL;
- else
+ else {
+ imo = ip_findmoptions(inp);
imo->imo_multicast_ttl = ttl;
+ INP_UNLOCK(inp);
+ }
}
break;
@@ -1696,14 +1721,18 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
error = sooptcopyin(sopt, &loop, 1, 1);
if (error)
break;
+ imo = ip_findmoptions(inp);
imo->imo_multicast_loop = !!loop;
+ INP_UNLOCK(inp);
} else {
u_int loop;
error = sooptcopyin(sopt, &loop, sizeof loop,
sizeof loop);
if (error)
break;
+ imo = ip_findmoptions(inp);
imo->imo_multicast_loop = !!loop;
+ INP_UNLOCK(inp);
}
break;
@@ -1757,6 +1786,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
* See if the membership already exists or if all the
* membership slots are full.
*/
+ imo = ip_findmoptions(inp);
for (i = 0; i < imo->imo_num_memberships; ++i) {
if (imo->imo_membership[i]->inm_ifp == ifp &&
imo->imo_membership[i]->inm_addr.s_addr
@@ -1764,11 +1794,13 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
break;
}
if (i < imo->imo_num_memberships) {
+ INP_UNLOCK(inp);
error = EADDRINUSE;
splx(s);
break;
}
if (i == IP_MAX_MEMBERSHIPS) {
+ INP_UNLOCK(inp);
error = ETOOMANYREFS;
splx(s);
break;
@@ -1779,11 +1811,13 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
*/
if ((imo->imo_membership[i] =
in_addmulti(&mreq.imr_multiaddr, ifp)) == NULL) {
+ INP_UNLOCK(inp);
error = ENOBUFS;
splx(s);
break;
}
++imo->imo_num_memberships;
+ INP_UNLOCK(inp);
splx(s);
break;
@@ -1819,6 +1853,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
/*
* Find the membership in the membership array.
*/
+ imo = ip_findmoptions(inp);
for (i = 0; i < imo->imo_num_memberships; ++i) {
if ((ifp == NULL ||
imo->imo_membership[i]->inm_ifp == ifp) &&
@@ -1827,6 +1862,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
break;
}
if (i == imo->imo_num_memberships) {
+ INP_UNLOCK(inp);
error = EADDRNOTAVAIL;
splx(s);
break;
@@ -1842,6 +1878,7 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
for (++i; i < imo->imo_num_memberships; ++i)
imo->imo_membership[i-1] = imo->imo_membership[i];
--imo->imo_num_memberships;
+ INP_UNLOCK(inp);
splx(s);
break;
@@ -1850,18 +1887,6 @@ ip_setmoptions(struct inpcb *inp, struct sockopt *sopt)
break;
}
- /*
- * If all options have default values, no need to keep the mbuf.
- */
- if (imo->imo_multicast_ifp == NULL &&
- imo->imo_multicast_vif == -1 &&
- imo->imo_multicast_ttl == IP_DEFAULT_MULTICAST_TTL &&
- imo->imo_multicast_loop == IP_DEFAULT_MULTICAST_LOOP &&
- imo->imo_num_memberships == 0) {
- free(inp->inp_moptions, M_IPMOPTS);
- inp->inp_moptions = NULL;
- }
-
return (error);
}
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