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Diffstat (limited to 'net/ipv6/mcast.c')
-rw-r--r--net/ipv6/mcast.c95
1 files changed, 68 insertions, 27 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index 393b6e6f50a..29fed6e58d0 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -188,6 +188,16 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
if (!ipv6_addr_is_multicast(addr))
return -EINVAL;
+ read_lock_bh(&ipv6_sk_mc_lock);
+ for (mc_lst=np->ipv6_mc_list; mc_lst; mc_lst=mc_lst->next) {
+ if ((ifindex == 0 || mc_lst->ifindex == ifindex) &&
+ ipv6_addr_equal(&mc_lst->addr, addr)) {
+ read_unlock_bh(&ipv6_sk_mc_lock);
+ return -EADDRINUSE;
+ }
+ }
+ read_unlock_bh(&ipv6_sk_mc_lock);
+
mc_lst = sock_kmalloc(sk, sizeof(struct ipv6_mc_socklist), GFP_KERNEL);
if (mc_lst == NULL)
@@ -271,7 +281,7 @@ int ipv6_sock_mc_drop(struct sock *sk, int ifindex, struct in6_addr *addr)
}
write_unlock_bh(&ipv6_sk_mc_lock);
- return -ENOENT;
+ return -EADDRNOTAVAIL;
}
static struct inet6_dev *ip6_mc_find_dev(struct in6_addr *group, int ifindex)
@@ -349,6 +359,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
struct ipv6_pinfo *inet6 = inet6_sk(sk);
struct ip6_sf_socklist *psl;
int i, j, rv;
+ int leavegroup = 0;
int err;
if (pgsr->gsr_group.ss_family != AF_INET6 ||
@@ -368,18 +379,23 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
err = -EADDRNOTAVAIL;
+ read_lock_bh(&ipv6_sk_mc_lock);
for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
if (pgsr->gsr_interface && pmc->ifindex != pgsr->gsr_interface)
continue;
if (ipv6_addr_equal(&pmc->addr, group))
break;
}
- if (!pmc) /* must have a prior join */
+ if (!pmc) { /* must have a prior join */
+ err = -EINVAL;
goto done;
+ }
/* if a source filter was set, must be the same mode as before */
if (pmc->sflist) {
- if (pmc->sfmode != omode)
+ if (pmc->sfmode != omode) {
+ err = -EINVAL;
goto done;
+ }
} else if (pmc->sfmode != omode) {
/* allow mode switches for empty-set filters */
ip6_mc_add_src(idev, group, omode, 0, NULL, 0);
@@ -390,7 +406,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
psl = pmc->sflist;
if (!add) {
if (!psl)
- goto done;
+ goto done; /* err = -EADDRNOTAVAIL */
rv = !0;
for (i=0; i<psl->sl_count; i++) {
rv = memcmp(&psl->sl_addr[i], source,
@@ -399,7 +415,13 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
break;
}
if (rv) /* source not found */
+ goto done; /* err = -EADDRNOTAVAIL */
+
+ /* special case - (INCLUDE, empty) == LEAVE_GROUP */
+ if (psl->sl_count == 1 && omode == MCAST_INCLUDE) {
+ leavegroup = 1;
goto done;
+ }
/* update the interface filter */
ip6_mc_del_src(idev, group, omode, 1, source, 1);
@@ -453,9 +475,12 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
/* update the interface list */
ip6_mc_add_src(idev, group, omode, 1, source, 1);
done:
+ read_unlock_bh(&ipv6_sk_mc_lock);
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
dev_put(dev);
+ if (leavegroup)
+ return ipv6_sock_mc_drop(sk, pgsr->gsr_interface, group);
return err;
}
@@ -467,6 +492,7 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
struct inet6_dev *idev;
struct ipv6_pinfo *inet6 = inet6_sk(sk);
struct ip6_sf_socklist *newpsl, *psl;
+ int leavegroup = 0;
int i, err;
group = &((struct sockaddr_in6 *)&gsf->gf_group)->sin6_addr;
@@ -482,7 +508,12 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
if (!idev)
return -ENODEV;
dev = idev->dev;
- err = -EADDRNOTAVAIL;
+
+ err = 0;
+ if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
+ leavegroup = 1;
+ goto done;
+ }
for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
if (pmc->ifindex != gsf->gf_interface)
@@ -490,8 +521,10 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
if (ipv6_addr_equal(&pmc->addr, group))
break;
}
- if (!pmc) /* must have a prior join */
+ if (!pmc) { /* must have a prior join */
+ err = -EINVAL;
goto done;
+ }
if (gsf->gf_numsrc) {
newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
@@ -523,10 +556,13 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
(void) ip6_mc_del_src(idev, group, pmc->sfmode, 0, NULL, 0);
pmc->sflist = newpsl;
pmc->sfmode = gsf->gf_fmode;
+ err = 0;
done:
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
dev_put(dev);
+ if (leavegroup)
+ err = ipv6_sock_mc_drop(sk, gsf->gf_interface, group);
return err;
}
@@ -1280,15 +1316,6 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
return NULL;
skb_reserve(skb, LL_RESERVED_SPACE(dev));
- if (dev->hard_header) {
- unsigned char ha[MAX_ADDR_LEN];
-
- ndisc_mc_map(&mld2_all_mcr, ha, dev, 1);
- if (dev->hard_header(skb, dev, ETH_P_IPV6,ha,NULL,size) < 0) {
- kfree_skb(skb);
- return NULL;
- }
- }
if (ipv6_get_lladdr(dev, &addr_buf)) {
/* <draft-ietf-magma-mld-source-05.txt>:
@@ -1312,6 +1339,30 @@ static struct sk_buff *mld_newpack(struct net_device *dev, int size)
return skb;
}
+static inline int mld_dev_queue_xmit2(struct sk_buff *skb)
+{
+ struct net_device *dev = skb->dev;
+
+ if (dev->hard_header) {
+ unsigned char ha[MAX_ADDR_LEN];
+ int err;
+
+ ndisc_mc_map(&skb->nh.ipv6h->daddr, ha, dev, 1);
+ err = dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, skb->len);
+ if (err < 0) {
+ kfree_skb(skb);
+ return err;
+ }
+ }
+ return dev_queue_xmit(skb);
+}
+
+static inline int mld_dev_queue_xmit(struct sk_buff *skb)
+{
+ return NF_HOOK(PF_INET6, NF_IP6_POST_ROUTING, skb, NULL, skb->dev,
+ mld_dev_queue_xmit2);
+}
+
static void mld_sendpack(struct sk_buff *skb)
{
struct ipv6hdr *pip6 = skb->nh.ipv6h;
@@ -1329,7 +1380,7 @@ static void mld_sendpack(struct sk_buff *skb)
pmr->csum = csum_ipv6_magic(&pip6->saddr, &pip6->daddr, mldlen,
IPPROTO_ICMPV6, csum_partial(skb->h.raw, mldlen, 0));
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
- dev_queue_xmit);
+ mld_dev_queue_xmit);
if (!err) {
ICMP6_INC_STATS(idev,ICMP6_MIB_OUTMSGS);
IP6_INC_STATS(IPSTATS_MIB_OUTMCASTPKTS);
@@ -1635,12 +1686,6 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
}
skb_reserve(skb, LL_RESERVED_SPACE(dev));
- if (dev->hard_header) {
- unsigned char ha[MAX_ADDR_LEN];
- ndisc_mc_map(snd_addr, ha, dev, 1);
- if (dev->hard_header(skb, dev, ETH_P_IPV6, ha, NULL, full_len) < 0)
- goto out;
- }
if (ipv6_get_lladdr(dev, &addr_buf)) {
/* <draft-ietf-magma-mld-source-05.txt>:
@@ -1668,7 +1713,7 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
idev = in6_dev_get(skb->dev);
err = NF_HOOK(PF_INET6, NF_IP6_LOCAL_OUT, skb, NULL, skb->dev,
- dev_queue_xmit);
+ mld_dev_queue_xmit);
if (!err) {
if (type == ICMPV6_MGM_REDUCTION)
ICMP6_INC_STATS(idev, ICMP6_MIB_OUTGROUPMEMBREDUCTIONS);
@@ -1682,10 +1727,6 @@ static void igmp6_send(struct in6_addr *addr, struct net_device *dev, int type)
if (likely(idev != NULL))
in6_dev_put(idev);
return;
-
-out:
- IP6_INC_STATS(IPSTATS_MIB_OUTDISCARDS);
- kfree_skb(skb);
}
static int ip6_mc_del1_src(struct ifmcaddr6 *pmc, int sfmode,
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-13 00:57:55 +0000