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Diffstat (limited to 'net/ipv6/mcast.c')
-rw-r--r--net/ipv6/mcast.c165
1 files changed, 123 insertions, 42 deletions
diff --git a/net/ipv6/mcast.c b/net/ipv6/mcast.c
index f15e04ad026e..6c05c7978bef 100644
--- a/net/ipv6/mcast.c
+++ b/net/ipv6/mcast.c
@@ -170,7 +170,7 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
#define MLDV2_QQIC(value) MLDV2_EXP(0x80, 4, 3, value)
#define MLDV2_MRC(value) MLDV2_EXP(0x8000, 12, 3, value)
-#define IPV6_MLD_MAX_MSF 10
+#define IPV6_MLD_MAX_MSF 64
int sysctl_mld_max_msf = IPV6_MLD_MAX_MSF;
@@ -224,6 +224,7 @@ int ipv6_sock_mc_join(struct sock *sk, int ifindex, struct in6_addr *addr)
mc_lst->ifindex = dev->ifindex;
mc_lst->sfmode = MCAST_EXCLUDE;
+ rwlock_init(&mc_lst->sflock);
mc_lst->sflist = NULL;
/*
@@ -360,6 +361,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
struct ip6_sf_socklist *psl;
int i, j, rv;
int leavegroup = 0;
+ int pmclocked = 0;
int err;
if (pgsr->gsr_group.ss_family != AF_INET6 ||
@@ -403,6 +405,9 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
pmc->sfmode = omode;
}
+ write_lock_bh(&pmc->sflock);
+ pmclocked = 1;
+
psl = pmc->sflist;
if (!add) {
if (!psl)
@@ -444,8 +449,7 @@ int ip6_mc_source(int add, int omode, struct sock *sk,
if (psl)
count += psl->sl_max;
- newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
- IP6_SFLSIZE(count), GFP_ATOMIC);
+ newpsl = sock_kmalloc(sk, IP6_SFLSIZE(count), GFP_ATOMIC);
if (!newpsl) {
err = -ENOBUFS;
goto done;
@@ -475,6 +479,8 @@ 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:
+ if (pmclocked)
+ write_unlock_bh(&pmc->sflock);
read_unlock_bh(&ipv6_sk_mc_lock);
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
@@ -510,6 +516,8 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
dev = idev->dev;
err = 0;
+ read_lock_bh(&ipv6_sk_mc_lock);
+
if (gsf->gf_fmode == MCAST_INCLUDE && gsf->gf_numsrc == 0) {
leavegroup = 1;
goto done;
@@ -526,8 +534,8 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
goto done;
}
if (gsf->gf_numsrc) {
- newpsl = (struct ip6_sf_socklist *)sock_kmalloc(sk,
- IP6_SFLSIZE(gsf->gf_numsrc), GFP_ATOMIC);
+ newpsl = sock_kmalloc(sk, IP6_SFLSIZE(gsf->gf_numsrc),
+ GFP_ATOMIC);
if (!newpsl) {
err = -ENOBUFS;
goto done;
@@ -549,6 +557,8 @@ int ip6_mc_msfilter(struct sock *sk, struct group_filter *gsf)
newpsl = NULL;
(void) ip6_mc_add_src(idev, group, gsf->gf_fmode, 0, NULL, 0);
}
+
+ write_lock_bh(&pmc->sflock);
psl = pmc->sflist;
if (psl) {
(void) ip6_mc_del_src(idev, group, pmc->sfmode,
@@ -558,8 +568,10 @@ 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;
+ write_unlock_bh(&pmc->sflock);
err = 0;
done:
+ read_unlock_bh(&ipv6_sk_mc_lock);
read_unlock_bh(&idev->lock);
in6_dev_put(idev);
dev_put(dev);
@@ -592,6 +604,11 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
dev = idev->dev;
err = -EADDRNOTAVAIL;
+ /*
+ * changes to the ipv6_mc_list require the socket lock and
+ * a read lock on ip6_sk_mc_lock. We have the socket lock,
+ * so reading the list is safe.
+ */
for (pmc=inet6->ipv6_mc_list; pmc; pmc=pmc->next) {
if (pmc->ifindex != gsf->gf_interface)
@@ -614,6 +631,10 @@ int ip6_mc_msfget(struct sock *sk, struct group_filter *gsf,
copy_to_user(optval, gsf, GROUP_FILTER_SIZE(0))) {
return -EFAULT;
}
+ /* changes to psl require the socket lock, a read lock on
+ * on ipv6_sk_mc_lock and a write lock on pmc->sflock. We
+ * have the socket lock, so reading here is safe.
+ */
for (i=0; i<copycount; i++) {
struct sockaddr_in6 *psin6;
struct sockaddr_storage ss;
@@ -650,6 +671,7 @@ int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
read_unlock(&ipv6_sk_mc_lock);
return 1;
}
+ read_lock(&mc->sflock);
psl = mc->sflist;
if (!psl) {
rv = mc->sfmode == MCAST_EXCLUDE;
@@ -665,6 +687,7 @@ int inet6_mc_check(struct sock *sk, struct in6_addr *mc_addr,
if (mc->sfmode == MCAST_EXCLUDE && i < psl->sl_count)
rv = 0;
}
+ read_unlock(&mc->sflock);
read_unlock(&ipv6_sk_mc_lock);
return rv;
@@ -744,7 +767,7 @@ static void mld_add_delrec(struct inet6_dev *idev, struct ifmcaddr6 *im)
* for deleted items allows change reports to use common code with
* non-deleted or query-response MCA's.
*/
- pmc = (struct ifmcaddr6 *)kmalloc(sizeof(*pmc), GFP_ATOMIC);
+ pmc = kmalloc(sizeof(*pmc), GFP_ATOMIC);
if (!pmc)
return;
memset(pmc, 0, sizeof(*pmc));
@@ -1068,23 +1091,64 @@ static void igmp6_group_queried(struct ifmcaddr6 *ma, unsigned long resptime)
ma->mca_flags |= MAF_TIMER_RUNNING;
}
-static void mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
+/* mark EXCLUDE-mode sources */
+static int mld_xmarksources(struct ifmcaddr6 *pmc, int nsrcs,
+ struct in6_addr *srcs)
+{
+ struct ip6_sf_list *psf;
+ int i, scount;
+
+ scount = 0;
+ for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
+ if (scount == nsrcs)
+ break;
+ for (i=0; i<nsrcs; i++) {
+ /* skip inactive filters */
+ if (pmc->mca_sfcount[MCAST_INCLUDE] ||
+ pmc->mca_sfcount[MCAST_EXCLUDE] !=
+ psf->sf_count[MCAST_EXCLUDE])
+ continue;
+ if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
+ scount++;
+ break;
+ }
+ }
+ }
+ pmc->mca_flags &= ~MAF_GSQUERY;
+ if (scount == nsrcs) /* all sources excluded */
+ return 0;
+ return 1;
+}
+
+static int mld_marksources(struct ifmcaddr6 *pmc, int nsrcs,
struct in6_addr *srcs)
{
struct ip6_sf_list *psf;
int i, scount;
+ if (pmc->mca_sfmode == MCAST_EXCLUDE)
+ return mld_xmarksources(pmc, nsrcs, srcs);
+
+ /* mark INCLUDE-mode sources */
+
scount = 0;
for (psf=pmc->mca_sources; psf; psf=psf->sf_next) {
if (scount == nsrcs)
break;
- for (i=0; i<nsrcs; i++)
+ for (i=0; i<nsrcs; i++) {
if (ipv6_addr_equal(&srcs[i], &psf->sf_addr)) {
psf->sf_gsresp = 1;
scount++;
break;
}
+ }
+ }
+ if (!scount) {
+ pmc->mca_flags &= ~MAF_GSQUERY;
+ return 0;
}
+ pmc->mca_flags |= MAF_GSQUERY;
+ return 1;
}
int igmp6_event_query(struct sk_buff *skb)
@@ -1167,7 +1231,7 @@ int igmp6_event_query(struct sk_buff *skb)
/* mark sources to include, if group & source-specific */
if (mlh2->nsrcs != 0) {
if (!pskb_may_pull(skb, srcs_offset +
- mlh2->nsrcs * sizeof(struct in6_addr))) {
+ ntohs(mlh2->nsrcs) * sizeof(struct in6_addr))) {
in6_dev_put(idev);
return -EINVAL;
}
@@ -1203,10 +1267,9 @@ int igmp6_event_query(struct sk_buff *skb)
else
ma->mca_flags &= ~MAF_GSQUERY;
}
- if (ma->mca_flags & MAF_GSQUERY)
- mld_marksources(ma, ntohs(mlh2->nsrcs),
- mlh2->srcs);
- igmp6_group_queried(ma, max_delay);
+ if (!(ma->mca_flags & MAF_GSQUERY) ||
+ mld_marksources(ma, ntohs(mlh2->nsrcs), mlh2->srcs))
+ igmp6_group_queried(ma, max_delay);
spin_unlock_bh(&ma->mca_lock);
if (group_type != IPV6_ADDR_ANY)
break;
@@ -1231,6 +1294,11 @@ int igmp6_event_report(struct sk_buff *skb)
if (skb->pkt_type == PACKET_LOOPBACK)
return 0;
+ /* send our report if the MC router may not have heard this report */
+ if (skb->pkt_type != PACKET_MULTICAST &&
+ skb->pkt_type != PACKET_BROADCAST)
+ return 0;
+
if (!pskb_may_pull(skb, sizeof(struct in6_addr)))
return -EINVAL;
@@ -1276,7 +1344,18 @@ static int is_in(struct ifmcaddr6 *pmc, struct ip6_sf_list *psf, int type,
case MLD2_MODE_IS_EXCLUDE:
if (gdeleted || sdeleted)
return 0;
- return !((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp);
+ if (!((pmc->mca_flags & MAF_GSQUERY) && !psf->sf_gsresp)) {
+ if (pmc->mca_sfmode == MCAST_INCLUDE)
+ return 1;
+ /* don't include if this source is excluded
+ * in all filters
+ */
+ if (psf->sf_count[MCAST_INCLUDE])
+ return 0;
+ return pmc->mca_sfcount[MCAST_EXCLUDE] ==
+ psf->sf_count[MCAST_EXCLUDE];
+ }
+ return 0;
case MLD2_CHANGE_TO_INCLUDE:
if (gdeleted || sdeleted)
return 0;
@@ -1445,7 +1524,7 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
struct mld2_report *pmr;
struct mld2_grec *pgr = NULL;
struct ip6_sf_list *psf, *psf_next, *psf_prev, **psf_list;
- int scount, first, isquery, truncate;
+ int scount, stotal, first, isquery, truncate;
if (pmc->mca_flags & MAF_NOREPORT)
return skb;
@@ -1455,25 +1534,13 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
truncate = type == MLD2_MODE_IS_EXCLUDE ||
type == MLD2_CHANGE_TO_EXCLUDE;
+ stotal = scount = 0;
+
psf_list = sdeleted ? &pmc->mca_tomb : &pmc->mca_sources;
- if (!*psf_list) {
- if (type == MLD2_ALLOW_NEW_SOURCES ||
- type == MLD2_BLOCK_OLD_SOURCES)
- return skb;
- if (pmc->mca_crcount || isquery) {
- /* make sure we have room for group header and at
- * least one source.
- */
- if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)+
- sizeof(struct in6_addr)) {
- mld_sendpack(skb);
- skb = NULL; /* add_grhead will get a new one */
- }
- skb = add_grhead(skb, pmc, type, &pgr);
- }
- return skb;
- }
+ if (!*psf_list)
+ goto empty_source;
+
pmr = skb ? (struct mld2_report *)skb->h.raw : NULL;
/* EX and TO_EX get a fresh packet, if needed */
@@ -1486,7 +1553,6 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
}
}
first = 1;
- scount = 0;
psf_prev = NULL;
for (psf=*psf_list; psf; psf=psf_next) {
struct in6_addr *psrc;
@@ -1520,7 +1586,7 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
}
psrc = (struct in6_addr *)skb_put(skb, sizeof(*psrc));
*psrc = psf->sf_addr;
- scount++;
+ scount++; stotal++;
if ((type == MLD2_ALLOW_NEW_SOURCES ||
type == MLD2_BLOCK_OLD_SOURCES) && psf->sf_crcount) {
psf->sf_crcount--;
@@ -1535,6 +1601,21 @@ static struct sk_buff *add_grec(struct sk_buff *skb, struct ifmcaddr6 *pmc,
}
psf_prev = psf;
}
+
+empty_source:
+ if (!stotal) {
+ if (type == MLD2_ALLOW_NEW_SOURCES ||
+ type == MLD2_BLOCK_OLD_SOURCES)
+ return skb;
+ if (pmc->mca_crcount || isquery) {
+ /* make sure we have room for group header */
+ if (skb && AVAILABLE(skb) < sizeof(struct mld2_grec)) {
+ mld_sendpack(skb);
+ skb = NULL; /* add_grhead will get a new one */
+ }
+ skb = add_grhead(skb, pmc, type, &pgr);
+ }
+ }
if (pgr)
pgr->grec_nsrcs = htons(scount);
@@ -1616,11 +1697,11 @@ static void mld_send_cr(struct inet6_dev *idev)
skb = add_grec(skb, pmc, dtype, 1, 1);
}
if (pmc->mca_crcount) {
- pmc->mca_crcount--;
if (pmc->mca_sfmode == MCAST_EXCLUDE) {
type = MLD2_CHANGE_TO_INCLUDE;
skb = add_grec(skb, pmc, type, 1, 0);
}
+ pmc->mca_crcount--;
if (pmc->mca_crcount == 0) {
mld_clear_zeros(&pmc->mca_tomb);
mld_clear_zeros(&pmc->mca_sources);
@@ -1654,12 +1735,12 @@ static void mld_send_cr(struct inet6_dev *idev)
/* filter mode changes */
if (pmc->mca_crcount) {
- pmc->mca_crcount--;
if (pmc->mca_sfmode == MCAST_EXCLUDE)
type = MLD2_CHANGE_TO_EXCLUDE;
else
type = MLD2_CHANGE_TO_INCLUDE;
skb = add_grec(skb, pmc, type, 0, 0);
+ pmc->mca_crcount--;
}
spin_unlock_bh(&pmc->mca_lock);
}
@@ -1855,7 +1936,7 @@ static int ip6_mc_add1_src(struct ifmcaddr6 *pmc, int sfmode,
psf_prev = psf;
}
if (!psf) {
- psf = (struct ip6_sf_list *)kmalloc(sizeof(*psf), GFP_ATOMIC);
+ psf = kmalloc(sizeof(*psf), GFP_ATOMIC);
if (!psf)
return -ENOBUFS;
memset(psf, 0, sizeof(*psf));
@@ -2018,6 +2099,9 @@ static int ip6_mc_leave_src(struct sock *sk, struct ipv6_mc_socklist *iml,
{
int err;
+ /* callers have the socket lock and a write lock on ipv6_sk_mc_lock,
+ * so no other readers or writers of iml or its sflist
+ */
if (iml->sflist == 0) {
/* any-source empty exclude case */
return ip6_mc_del_src(idev, &iml->addr, iml->sfmode, 0, NULL, 0);
@@ -2289,7 +2373,7 @@ static int igmp6_mc_seq_show(struct seq_file *seq, void *v)
struct igmp6_mc_iter_state *state = igmp6_mc_seq_private(seq);
seq_printf(seq,
- "%-4d %-15s %04x%04x%04x%04x%04x%04x%04x%04x %5d %08X %ld\n",
+ "%-4d %-15s " NIP6_SEQFMT " %5d %08X %ld\n",
state->dev->ifindex, state->dev->name,
NIP6(im->mca_addr),
im->mca_users, im->mca_flags,
@@ -2463,10 +2547,7 @@ static int igmp6_mcf_seq_show(struct seq_file *seq, void *v)
"Source Address", "INC", "EXC");
} else {
seq_printf(seq,
- "%3d %6.6s "
- "%04x%04x%04x%04x%04x%04x%04x%04x "
- "%04x%04x%04x%04x%04x%04x%04x%04x "
- "%6lu %6lu\n",
+ "%3d %6.6s " NIP6_SEQFMT " " NIP6_SEQFMT " %6lu %6lu\n",
state->dev->ifindex, state->dev->name,
NIP6(state->im->mca_addr),
NIP6(psf->sf_addr),
generated by cgit v1.2.3 (git 2.39.0) at 2024-10-17 12:00:26 +0300