kernel: bridge: multicast-to-unicast related fixes
This commit backports fixes from OpenWRT trunk regarding the multicast-to-unicast feature for the Linux bridge: * Revert "kernel: disable multicast-to-unicast translation for ipv6 neighbor solicitation (#17625)" * kernel: bridge, multicast-to-unicast: assign src after pskb_may_pull() * kernel: bridge, multicast-to-unicast: fix echoes on STA Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
This commit is contained in:
Linus Lüssing
parent
6f5704624d
commit
37dde25598
@ -0,0 +1,181 @@
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From: Linus Lüssing <linus.luessing@c0d3.blue>
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Date: Sat, 5 Sep 2015 02:57:34 +0200
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Subject: Revert "kernel: disable multicast-to-unicast translation for ipv6 neighbor solicitation (#17625)"
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This reverts commit a080e8e1943156168913d0353a2e99d1151102aa.
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It did not fix the problem but just hid some symptom. The real issue was
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that IGMP/MLD report suppression was not considered for the
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multicast-to-unicast feature. A recent netifd which isolates IGMP/MLD
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reports between STAs by utilizing AP-isolation and bridge-hairpinning
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should have fixed this.
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It is perfectly fine to apply multicast-to-unicast to IPv6 Neighbor
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Solicitations, too (once that feature is configured correctly).
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Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46720 3c298f89-4303-0410-b956-a3cf2f4a3e73
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diff --git a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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index 00ad14f..8c436e0 100644
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--- a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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+++ b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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@@ -87,19 +87,16 @@
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{
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struct br_ip br_group;
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-@@ -736,7 +758,10 @@ static int br_ip6_multicast_add_group(st
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+@@ -736,7 +758,7 @@ static int br_ip6_multicast_add_group(st
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br_group.proto = htons(ETH_P_IPV6);
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br_group.vid = vid;
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- return br_multicast_add_group(br, port, &br_group);
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-+ if (ipv6_addr_is_solict_mult(group))
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-+ src = NULL;
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-+
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+ return br_multicast_add_group(br, port, &br_group, src);
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}
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#endif
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-@@ -965,6 +990,7 @@ static int br_ip4_multicast_igmp3_report
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+@@ -965,6 +987,7 @@ static int br_ip4_multicast_igmp3_report
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struct sk_buff *skb,
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u16 vid)
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{
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@@ -107,7 +104,7 @@
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struct igmpv3_report *ih;
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struct igmpv3_grec *grec;
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int i;
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-@@ -1008,7 +1034,7 @@ static int br_ip4_multicast_igmp3_report
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+@@ -1008,7 +1031,7 @@ static int br_ip4_multicast_igmp3_report
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continue;
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}
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@@ -116,7 +113,7 @@
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if (err)
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break;
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}
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-@@ -1022,6 +1048,7 @@ static int br_ip6_multicast_mld2_report(
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+@@ -1022,6 +1045,7 @@ static int br_ip6_multicast_mld2_report(
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struct sk_buff *skb,
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u16 vid)
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{
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@@ -124,7 +121,7 @@
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struct icmp6hdr *icmp6h;
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struct mld2_grec *grec;
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int i;
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-@@ -1070,7 +1097,7 @@ static int br_ip6_multicast_mld2_report(
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+@@ -1070,7 +1094,7 @@ static int br_ip6_multicast_mld2_report(
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}
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err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
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@@ -133,7 +130,7 @@
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if (err)
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break;
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}
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-@@ -1406,7 +1433,8 @@ br_multicast_leave_group(struct net_brid
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+@@ -1406,7 +1430,8 @@ br_multicast_leave_group(struct net_brid
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struct net_bridge_port *port,
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struct br_ip *group,
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struct bridge_mcast_other_query *other_query,
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@@ -143,7 +140,7 @@
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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-@@ -1456,7 +1484,7 @@ br_multicast_leave_group(struct net_brid
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+@@ -1456,7 +1481,7 @@ br_multicast_leave_group(struct net_brid
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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@@ -152,7 +149,7 @@
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continue;
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rcu_assign_pointer(*pp, p->next);
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-@@ -1490,7 +1518,7 @@ br_multicast_leave_group(struct net_brid
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+@@ -1490,7 +1515,7 @@ br_multicast_leave_group(struct net_brid
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for (p = mlock_dereference(mp->ports, br);
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p != NULL;
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p = mlock_dereference(p->next, br)) {
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@@ -161,7 +158,7 @@
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continue;
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if (!hlist_unhashed(&p->mglist) &&
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-@@ -1508,8 +1536,8 @@ out:
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+@@ -1508,8 +1533,8 @@ out:
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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@@ -172,7 +169,7 @@
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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-@@ -1524,14 +1552,14 @@ static void br_ip4_multicast_leave_group
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+@@ -1524,14 +1549,14 @@ static void br_ip4_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
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@@ -189,7 +186,7 @@
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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-@@ -1546,7 +1574,7 @@ static void br_ip6_multicast_leave_group
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+@@ -1546,7 +1571,7 @@ static void br_ip6_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
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@@ -198,7 +195,7 @@
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}
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#endif
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-@@ -1555,6 +1583,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1555,6 +1580,7 @@ static int br_multicast_ipv4_rcv(struct
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struct sk_buff *skb,
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u16 vid)
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{
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@@ -206,7 +203,7 @@
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struct sk_buff *skb2 = skb;
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const struct iphdr *iph;
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struct igmphdr *ih;
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-@@ -1628,7 +1657,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1628,7 +1654,7 @@ static int br_multicast_ipv4_rcv(struct
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case IGMP_HOST_MEMBERSHIP_REPORT:
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case IGMPV2_HOST_MEMBERSHIP_REPORT:
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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@@ -215,7 +212,7 @@
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break;
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case IGMPV3_HOST_MEMBERSHIP_REPORT:
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err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
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-@@ -1637,7 +1666,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1637,7 +1663,7 @@ static int br_multicast_ipv4_rcv(struct
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err = br_ip4_multicast_query(br, port, skb2, vid);
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break;
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case IGMP_HOST_LEAVE_MESSAGE:
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@@ -224,7 +221,7 @@
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break;
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}
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-@@ -1655,6 +1684,7 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1655,6 +1681,7 @@ static int br_multicast_ipv6_rcv(struct
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struct sk_buff *skb,
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u16 vid)
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{
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@@ -232,7 +229,7 @@
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struct sk_buff *skb2;
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const struct ipv6hdr *ip6h;
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u8 icmp6_type;
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-@@ -1764,7 +1794,8 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1764,7 +1791,8 @@ static int br_multicast_ipv6_rcv(struct
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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@@ -242,7 +239,7 @@
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break;
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}
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case ICMPV6_MLD2_REPORT:
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-@@ -1781,7 +1812,7 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1781,7 +1809,7 @@ static int br_multicast_ipv6_rcv(struct
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goto out;
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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@ -0,0 +1,173 @@
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From: Linus Lüssing <linus.luessing@c0d3.blue>
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Date: Sat, 5 Sep 2015 03:11:34 +0200
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Subject: kernel: bridge, multicast-to-unicast: assign src after pskb_may_pull()
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A call to pskb_may_pull() might reallocate skb->data. Therefore we
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should only assign the src-pointer after any potential reallocations.
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Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
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Signed-off-by: Felix Fietkau <nbd@openwrt.org>
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git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46721 3c298f89-4303-0410-b956-a3cf2f4a3e73
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diff --git a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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index 8c436e0..6707b03 100644
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--- a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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+++ b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
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@@ -100,37 +100,40 @@
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struct sk_buff *skb,
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u16 vid)
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{
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-+ const unsigned char *src = eth_hdr(skb)->h_source;
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++ const unsigned char *src;
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struct igmpv3_report *ih;
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struct igmpv3_grec *grec;
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int i;
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-@@ -1008,7 +1031,7 @@ static int br_ip4_multicast_igmp3_report
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+@@ -1008,7 +1031,8 @@ static int br_ip4_multicast_igmp3_report
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continue;
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}
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- err = br_ip4_multicast_add_group(br, port, group, vid);
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++ src = eth_hdr(skb)->h_source;
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+ err = br_ip4_multicast_add_group(br, port, group, vid, src);
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if (err)
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break;
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}
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-@@ -1022,6 +1045,7 @@ static int br_ip6_multicast_mld2_report(
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+@@ -1022,6 +1046,7 @@ static int br_ip6_multicast_mld2_report(
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struct sk_buff *skb,
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u16 vid)
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{
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-+ const unsigned char *src = eth_hdr(skb)->h_source;
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++ const unsigned char *src;
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struct icmp6hdr *icmp6h;
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struct mld2_grec *grec;
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int i;
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-@@ -1070,7 +1094,7 @@ static int br_ip6_multicast_mld2_report(
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+@@ -1069,8 +1094,9 @@ static int br_ip6_multicast_mld2_report(
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+ continue;
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}
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++ src = eth_hdr(skb)->h_source;
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err = br_ip6_multicast_add_group(br, port, &grec->grec_mca,
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- vid);
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+ vid, src);
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if (err)
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break;
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}
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-@@ -1406,7 +1430,8 @@ br_multicast_leave_group(struct net_brid
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+@@ -1406,7 +1432,8 @@ br_multicast_leave_group(struct net_brid
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struct net_bridge_port *port,
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struct br_ip *group,
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struct bridge_mcast_other_query *other_query,
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@@ -140,7 +143,7 @@
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{
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struct net_bridge_mdb_htable *mdb;
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struct net_bridge_mdb_entry *mp;
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-@@ -1456,7 +1481,7 @@ br_multicast_leave_group(struct net_brid
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+@@ -1456,7 +1483,7 @@ br_multicast_leave_group(struct net_brid
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for (pp = &mp->ports;
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(p = mlock_dereference(*pp, br)) != NULL;
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pp = &p->next) {
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@@ -149,7 +152,7 @@
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continue;
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rcu_assign_pointer(*pp, p->next);
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-@@ -1490,7 +1515,7 @@ br_multicast_leave_group(struct net_brid
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+@@ -1490,7 +1517,7 @@ br_multicast_leave_group(struct net_brid
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for (p = mlock_dereference(mp->ports, br);
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p != NULL;
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p = mlock_dereference(p->next, br)) {
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@@ -158,7 +161,7 @@
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continue;
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if (!hlist_unhashed(&p->mglist) &&
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-@@ -1508,8 +1533,8 @@ out:
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+@@ -1508,8 +1535,8 @@ out:
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static void br_ip4_multicast_leave_group(struct net_bridge *br,
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struct net_bridge_port *port,
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@@ -169,7 +172,7 @@
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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-@@ -1524,14 +1549,14 @@ static void br_ip4_multicast_leave_group
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+@@ -1524,14 +1551,14 @@ static void br_ip4_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip4_other_query,
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@@ -186,7 +189,7 @@
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{
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struct br_ip br_group;
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struct bridge_mcast_own_query *own_query;
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-@@ -1546,7 +1571,7 @@ static void br_ip6_multicast_leave_group
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+@@ -1546,7 +1573,7 @@ static void br_ip6_multicast_leave_group
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br_group.vid = vid;
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br_multicast_leave_group(br, port, &br_group, &br->ip6_other_query,
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@@ -195,41 +198,43 @@
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}
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#endif
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-@@ -1555,6 +1580,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1555,6 +1582,7 @@ static int br_multicast_ipv4_rcv(struct
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struct sk_buff *skb,
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u16 vid)
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{
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-+ const unsigned char *src = eth_hdr(skb)->h_source;
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++ const unsigned char *src;
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struct sk_buff *skb2 = skb;
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const struct iphdr *iph;
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struct igmphdr *ih;
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-@@ -1628,7 +1654,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1628,7 +1656,8 @@ static int br_multicast_ipv4_rcv(struct
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case IGMP_HOST_MEMBERSHIP_REPORT:
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case IGMPV2_HOST_MEMBERSHIP_REPORT:
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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- err = br_ip4_multicast_add_group(br, port, ih->group, vid);
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++ src = eth_hdr(skb)->h_source;
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+ err = br_ip4_multicast_add_group(br, port, ih->group, vid, src);
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break;
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case IGMPV3_HOST_MEMBERSHIP_REPORT:
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err = br_ip4_multicast_igmp3_report(br, port, skb2, vid);
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-@@ -1637,7 +1663,7 @@ static int br_multicast_ipv4_rcv(struct
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+@@ -1637,7 +1666,8 @@ static int br_multicast_ipv4_rcv(struct
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err = br_ip4_multicast_query(br, port, skb2, vid);
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break;
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case IGMP_HOST_LEAVE_MESSAGE:
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- br_ip4_multicast_leave_group(br, port, ih->group, vid);
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++ src = eth_hdr(skb)->h_source;
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+ br_ip4_multicast_leave_group(br, port, ih->group, vid, src);
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break;
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}
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-@@ -1655,6 +1681,7 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1655,6 +1685,7 @@ static int br_multicast_ipv6_rcv(struct
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struct sk_buff *skb,
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u16 vid)
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{
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-+ const unsigned char *src = eth_hdr(skb)->h_source;
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++ const unsigned char *src;
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struct sk_buff *skb2;
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const struct ipv6hdr *ip6h;
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u8 icmp6_type;
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-@@ -1764,7 +1791,8 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1764,7 +1795,8 @@ static int br_multicast_ipv6_rcv(struct
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
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@@ -239,11 +244,12 @@
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break;
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}
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case ICMPV6_MLD2_REPORT:
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-@@ -1781,7 +1809,7 @@ static int br_multicast_ipv6_rcv(struct
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+@@ -1781,7 +1813,8 @@ static int br_multicast_ipv6_rcv(struct
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goto out;
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}
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mld = (struct mld_msg *)skb_transport_header(skb2);
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- br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid);
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++ src = eth_hdr(skb)->h_source;
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+ br_ip6_multicast_leave_group(br, port, &mld->mld_mca, vid, src);
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}
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}
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@ -0,0 +1,70 @@
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From: Linus Lüssing <linus.luessing@c0d3.blue>
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Date: Sat, 5 Sep 2015 03:18:28 +0200
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Subject: kernel: bridge, multicast-to-unicast: fix echoes on STA
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Currently, multicast packets from an STA are sent to any according
|
||||
multicast listener directly through the bridge multicast-to-unicast
|
||||
feature. Unfortunately, so far this includes the originating STA, too,
|
||||
resulting in multicast packets being echo'ed back to the originating STA
|
||||
if it itself is a multicast listener for that group.
|
||||
|
||||
This behaviour breaks IPv6 duplicate address detection: An IPv6 Neighbor
|
||||
Solicitation for IPv6 Duplicate Address Detection is being echo'ed back,
|
||||
resulting in the host falsely detecting an address collision, which
|
||||
makes the node unable to claim an IPv6 address and use IPv6 in general.
|
||||
|
||||
Mac80211 unfortunately only prevents the echoes for us for multicast
|
||||
frames. For the multicast frames cast to a unicast destination we'll
|
||||
need to take care of excluding the originator ourselves.
|
||||
|
||||
Signed-off-by: Linus Lüssing <linus.luessing@c0d3.blue>
|
||||
|
||||
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@46765 3c298f89-4303-0410-b956-a3cf2f4a3e73
|
||||
|
||||
diff --git a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
|
||||
index 6707b03..399f5c6 100644
|
||||
--- a/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
|
||||
+++ b/target/linux/generic/patches-3.18/645-bridge_multicast_to_unicast.patch
|
||||
@@ -297,7 +297,7 @@
|
||||
rcu_assign_pointer(*pp, p);
|
||||
--- a/net/bridge/br_forward.c
|
||||
+++ b/net/bridge/br_forward.c
|
||||
-@@ -168,6 +168,29 @@ out:
|
||||
+@@ -168,6 +168,34 @@ out:
|
||||
return p;
|
||||
}
|
||||
|
||||
@@ -308,10 +308,15 @@
|
||||
+ struct sk_buff *skb))
|
||||
+{
|
||||
+ struct net_device *dev = BR_INPUT_SKB_CB(skb)->brdev;
|
||||
++ const unsigned char *src = eth_hdr(skb)->h_source;
|
||||
+
|
||||
+ if (!should_deliver(p, skb))
|
||||
+ return prev;
|
||||
+
|
||||
++ /* Even with hairpin, no soliloquies - prevent breaking IPv6 DAD */
|
||||
++ if (skb->dev == p->dev && ether_addr_equal(src, addr))
|
||||
++ return prev;
|
||||
++
|
||||
+ skb = skb_copy(skb, GFP_ATOMIC);
|
||||
+ if (!skb) {
|
||||
+ dev->stats.tx_dropped++;
|
||||
@@ -327,7 +332,7 @@
|
||||
/* called under bridge lock */
|
||||
static void br_flood(struct net_bridge *br, struct sk_buff *skb,
|
||||
struct sk_buff *skb0,
|
||||
-@@ -232,6 +255,7 @@ static void br_multicast_flood(struct ne
|
||||
+@@ -232,6 +260,7 @@ static void br_multicast_flood(struct ne
|
||||
struct net_bridge_port *prev = NULL;
|
||||
struct net_bridge_port_group *p;
|
||||
struct hlist_node *rp;
|
||||
@@ -335,7 +340,7 @@
|
||||
|
||||
rp = rcu_dereference(hlist_first_rcu(&br->router_list));
|
||||
p = mdst ? rcu_dereference(mdst->ports) : NULL;
|
||||
-@@ -242,10 +266,19 @@ static void br_multicast_flood(struct ne
|
||||
+@@ -242,10 +271,19 @@ static void br_multicast_flood(struct ne
|
||||
rport = rp ? hlist_entry(rp, struct net_bridge_port, rlist) :
|
||||
NULL;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user