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bridge br_multicast: IPv6 MLD support. 

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki 2010-04-23 01:54:22 +09:00
parent 8ef2a9a598
commit 08b202b672
3 changed files with 430 additions and 5 deletions
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6
net/bridge/Kconfig
View File

@ -33,14 +33,14 @@ config BRIDGE
If unsure, say N.
config BRIDGE_IGMP_SNOOPING
bool "IGMP snooping"
bool "IGMP/MLD snooping"
depends on BRIDGE
depends on INET
default y
---help---
If you say Y here, then the Ethernet bridge will be able selectively
forward multicast traffic based on IGMP traffic received from each
port.
forward multicast traffic based on IGMP/MLD traffic received from
each port.
Say N to exclude this support and reduce the binary size.

426
net/bridge/br_multicast.c
View File

@ -24,9 +24,24 @@
#include <linux/slab.h>
#include <linux/timer.h>
#include <net/ip.h>
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
#include <net/ipv6.h>
#include <net/mld.h>
#include <net/addrconf.h>
#endif
#include "br_private.h"
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static inline int ipv6_is_local_multicast(const struct in6_addr *addr)
{
if (ipv6_addr_is_multicast(addr) &&
IPV6_ADDR_MC_SCOPE(addr) <= IPV6_ADDR_SCOPE_LINKLOCAL)
return 1;
return 0;
}
#endif
static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
{
if (a->proto != b->proto)
@ -34,6 +49,10 @@ static inline int br_ip_equal(const struct br_ip *a, const struct br_ip *b)
switch (a->proto) {
case htons(ETH_P_IP):
return a->u.ip4 == b->u.ip4;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case htons(ETH_P_IPV6):
return ipv6_addr_equal(&a->u.ip6, &b->u.ip6);
#endif
}
return 0;
}
@ -43,12 +62,24 @@ static inline int __br_ip4_hash(struct net_bridge_mdb_htable *mdb, __be32 ip)
return jhash_1word(mdb->secret, (__force u32)ip) & (mdb->max - 1);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static inline int __br_ip6_hash(struct net_bridge_mdb_htable *mdb,
const struct in6_addr *ip)
{
return jhash2((__force u32 *)ip->s6_addr32, 4, mdb->secret) & (mdb->max - 1);
}
#endif
static inline int br_ip_hash(struct net_bridge_mdb_htable *mdb,
struct br_ip *ip)
{
switch (ip->proto) {
case htons(ETH_P_IP):
return __br_ip4_hash(mdb, ip->u.ip4);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case htons(ETH_P_IPV6):
return __br_ip6_hash(mdb, &ip->u.ip6);
#endif
}
return 0;
}
@ -78,6 +109,19 @@ static struct net_bridge_mdb_entry *br_mdb_ip4_get(
return __br_mdb_ip_get(mdb, &br_dst, __br_ip4_hash(mdb, dst));
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static struct net_bridge_mdb_entry *br_mdb_ip6_get(
struct net_bridge_mdb_htable *mdb, const struct in6_addr *dst)
{
struct br_ip br_dst;
ipv6_addr_copy(&br_dst.u.ip6, dst);
br_dst.proto = htons(ETH_P_IPV6);
return __br_mdb_ip_get(mdb, &br_dst, __br_ip6_hash(mdb, dst));
}
#endif
static struct net_bridge_mdb_entry *br_mdb_ip_get(
struct net_bridge_mdb_htable *mdb, struct br_ip *dst)
{
@ -102,6 +146,11 @@ struct net_bridge_mdb_entry *br_mdb_get(struct net_bridge *br,
case htons(ETH_P_IP):
ip.u.ip4 = ip_hdr(skb)->daddr;
break;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case htons(ETH_P_IPV6):
ipv6_addr_copy(&ip.u.ip6, &ipv6_hdr(skb)->daddr);
break;
#endif
default:
return NULL;
}
@ -352,12 +401,94 @@ out:
return skb;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static struct sk_buff *br_ip6_multicast_alloc_query(struct net_bridge *br,
struct in6_addr *group)
{
struct sk_buff *skb;
struct ipv6hdr *ip6h;
struct mld_msg *mldq;
struct ethhdr *eth;
u8 *hopopt;
unsigned long interval;
skb = netdev_alloc_skb_ip_align(br->dev, sizeof(*eth) + sizeof(*ip6h) +
8 + sizeof(*mldq));
if (!skb)
goto out;
skb->protocol = htons(ETH_P_IPV6);
/* Ethernet header */
skb_reset_mac_header(skb);
eth = eth_hdr(skb);
memcpy(eth->h_source, br->dev->dev_addr, 6);
ipv6_eth_mc_map(group, eth->h_dest);
eth->h_proto = htons(ETH_P_IPV6);
skb_put(skb, sizeof(*eth));
/* IPv6 header + HbH option */
skb_set_network_header(skb, skb->len);
ip6h = ipv6_hdr(skb);
*(__force __be32 *)ip6h = htonl(0x60000000);
ip6h->payload_len = 8 + sizeof(*mldq);
ip6h->nexthdr = IPPROTO_HOPOPTS;
ip6h->hop_limit = 1;
ipv6_addr_set(&ip6h->saddr, 0, 0, 0, 0);
ipv6_addr_set(&ip6h->daddr, htonl(0xff020000), 0, 0, htonl(1));
hopopt = (u8 *)(ip6h + 1);
hopopt[0] = IPPROTO_ICMPV6; /* next hdr */
hopopt[1] = 0; /* length of HbH */
hopopt[2] = IPV6_TLV_ROUTERALERT; /* Router Alert */
hopopt[3] = 2; /* Length of RA Option */
hopopt[4] = 0; /* Type = 0x0000 (MLD) */
hopopt[5] = 0;
hopopt[6] = IPV6_TLV_PAD0; /* Pad0 */
hopopt[7] = IPV6_TLV_PAD0; /* Pad0 */
skb_put(skb, sizeof(*ip6h) + 8);
/* ICMPv6 */
skb_set_transport_header(skb, skb->len);
mldq = (struct mld_msg *) icmp6_hdr(skb);
interval = ipv6_addr_any(group) ? br->multicast_last_member_interval :
br->multicast_query_response_interval;
mldq->mld_type = ICMPV6_MGM_QUERY;
mldq->mld_code = 0;
mldq->mld_cksum = 0;
mldq->mld_maxdelay = htons((u16)jiffies_to_msecs(interval));
mldq->mld_reserved = 0;
ipv6_addr_copy(&mldq->mld_mca, group);
/* checksum */
mldq->mld_cksum = csum_ipv6_magic(&ip6h->saddr, &ip6h->daddr,
sizeof(*mldq), IPPROTO_ICMPV6,
csum_partial(mldq,
sizeof(*mldq), 0));
skb_put(skb, sizeof(*mldq));
__skb_pull(skb, sizeof(*eth));
out:
return skb;
}
#endif
static struct sk_buff *br_multicast_alloc_query(struct net_bridge *br,
struct br_ip *addr)
{
switch (addr->proto) {
case htons(ETH_P_IP):
return br_ip4_multicast_alloc_query(br, addr->u.ip4);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case htons(ETH_P_IPV6):
return br_ip6_multicast_alloc_query(br, &addr->u.ip6);
#endif
}
return NULL;
}
@ -631,6 +762,23 @@ static int br_ip4_multicast_add_group(struct net_bridge *br,
return br_multicast_add_group(br, port, &br_group);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static int br_ip6_multicast_add_group(struct net_bridge *br,
struct net_bridge_port *port,
const struct in6_addr *group)
{
struct br_ip br_group;
if (ipv6_is_local_multicast(group))
return 0;
ipv6_addr_copy(&br_group.u.ip6, group);
br_group.proto = htons(ETH_P_IP);
return br_multicast_add_group(br, port, &br_group);
}
#endif
static void br_multicast_router_expired(unsigned long data)
{
struct net_bridge_port *port = (void *)data;
@ -681,11 +829,16 @@ static void br_multicast_send_query(struct net_bridge *br,
timer_pending(&br->multicast_querier_timer))
return;
br_group.u.ip4 = 0;
br_group.proto = htons(ETH_P_IP);
memset(&br_group.u, 0, sizeof(br_group.u));
br_group.proto = htons(ETH_P_IP);
__br_multicast_send_query(br, port, &br_group);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
br_group.proto = htons(ETH_P_IPV6);
__br_multicast_send_query(br, port, &br_group);
#endif
time = jiffies;
time += sent < br->multicast_startup_query_count ?
br->multicast_startup_query_interval :
@ -825,6 +978,66 @@ static int br_ip4_multicast_igmp3_report(struct net_bridge *br,
return err;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static int br_ip6_multicast_mld2_report(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
struct icmp6hdr *icmp6h;
struct mld2_grec *grec;
int i;
int len;
int num;
int err = 0;
if (!pskb_may_pull(skb, sizeof(*icmp6h)))
return -EINVAL;
icmp6h = icmp6_hdr(skb);
num = ntohs(icmp6h->icmp6_dataun.un_data16[1]);
len = sizeof(*icmp6h);
for (i = 0; i < num; i++) {
__be16 *nsrcs, _nsrcs;
nsrcs = skb_header_pointer(skb,
len + offsetof(struct mld2_grec,
grec_mca),
sizeof(_nsrcs), &_nsrcs);
if (!nsrcs)
return -EINVAL;
if (!pskb_may_pull(skb,
len + sizeof(*grec) +
sizeof(struct in6_addr) * (*nsrcs)))
return -EINVAL;
grec = (struct mld2_grec *)(skb->data + len);
len += sizeof(*grec) + sizeof(struct in6_addr) * (*nsrcs);
/* We treat these as MLDv1 reports for now. */
switch (grec->grec_type) {
case MLD2_MODE_IS_INCLUDE:
case MLD2_MODE_IS_EXCLUDE:
case MLD2_CHANGE_TO_INCLUDE:
case MLD2_CHANGE_TO_EXCLUDE:
case MLD2_ALLOW_NEW_SOURCES:
case MLD2_BLOCK_OLD_SOURCES:
break;
default:
continue;
}
err = br_ip6_multicast_add_group(br, port, &grec->grec_mca);
if (!err)
break;
}
return err;
}
#endif
static void br_multicast_add_router(struct net_bridge *br,
struct net_bridge_port *port)
{
@ -955,6 +1168,75 @@ out:
return err;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static int br_ip6_multicast_query(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
struct ipv6hdr *ip6h = ipv6_hdr(skb);
struct mld_msg *mld = (struct mld_msg *) icmp6_hdr(skb);
struct net_bridge_mdb_entry *mp;
struct mld2_query *mld2q;
struct net_bridge_port_group *p, **pp;
unsigned long max_delay;
unsigned long now = jiffies;
struct in6_addr *group = NULL;
int err = 0;
spin_lock(&br->multicast_lock);
if (!netif_running(br->dev) ||
(port && port->state == BR_STATE_DISABLED))
goto out;
br_multicast_query_received(br, port, !ipv6_addr_any(&ip6h->saddr));
if (skb->len == sizeof(*mld)) {
if (!pskb_may_pull(skb, sizeof(*mld))) {
err = -EINVAL;
goto out;
}
mld = (struct mld_msg *) icmp6_hdr(skb);
max_delay = msecs_to_jiffies(htons(mld->mld_maxdelay));
if (max_delay)
group = &mld->mld_mca;
} else if (skb->len >= sizeof(*mld2q)) {
if (!pskb_may_pull(skb, sizeof(*mld2q))) {
err = -EINVAL;
goto out;
}
mld2q = (struct mld2_query *)icmp6_hdr(skb);
if (!mld2q->mld2q_nsrcs)
group = &mld2q->mld2q_mca;
max_delay = mld2q->mld2q_mrc ? MLDV2_MRC(mld2q->mld2q_mrc) : 1;
}
if (!group)
goto out;
mp = br_mdb_ip6_get(br->mdb, group);
if (!mp)
goto out;
max_delay *= br->multicast_last_member_count;
if (!hlist_unhashed(&mp->mglist) &&
(timer_pending(&mp->timer) ?
time_after(mp->timer.expires, now + max_delay) :
try_to_del_timer_sync(&mp->timer) >= 0))
mod_timer(&mp->timer, now + max_delay);
for (pp = &mp->ports; (p = *pp); pp = &p->next) {
if (timer_pending(&p->timer) ?
time_after(p->timer.expires, now + max_delay) :
try_to_del_timer_sync(&p->timer) >= 0)
mod_timer(&mp->timer, now + max_delay);
}
out:
spin_unlock(&br->multicast_lock);
return err;
}
#endif
static void br_multicast_leave_group(struct net_bridge *br,
struct net_bridge_port *port,
struct br_ip *group)
@ -1030,6 +1312,22 @@ static void br_ip4_multicast_leave_group(struct net_bridge *br,
br_multicast_leave_group(br, port, &br_group);
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static void br_ip6_multicast_leave_group(struct net_bridge *br,
struct net_bridge_port *port,
const struct in6_addr *group)
{
struct br_ip br_group;
if (ipv6_is_local_multicast(group))
return;
ipv6_addr_copy(&br_group.u.ip6, group);
br_group.proto = htons(ETH_P_IPV6);
br_multicast_leave_group(br, port, &br_group);
}
#endif
static int br_multicast_ipv4_rcv(struct net_bridge *br,
struct net_bridge_port *port,
@ -1129,6 +1427,126 @@ err_out:
return err;
}
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
static int br_multicast_ipv6_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb)
{
struct sk_buff *skb2 = skb;
struct ipv6hdr *ip6h;
struct icmp6hdr *icmp6h;
u8 nexthdr;
unsigned len;
unsigned offset;
int err;
BR_INPUT_SKB_CB(skb)->igmp = 0;
BR_INPUT_SKB_CB(skb)->mrouters_only = 0;
if (!pskb_may_pull(skb, sizeof(*ip6h)))
return -EINVAL;
ip6h = ipv6_hdr(skb);
/*
* We're interested in MLD messages only.
* - Version is 6
* - MLD has always Router Alert hop-by-hop option
* - But we do not support jumbrograms.
*/
if (ip6h->version != 6 ||
ip6h->nexthdr != IPPROTO_HOPOPTS ||
ip6h->payload_len == 0)
return 0;
len = ntohs(ip6h->payload_len);
if (skb->len < len)
return -EINVAL;
nexthdr = ip6h->nexthdr;
offset = ipv6_skip_exthdr(skb, sizeof(*ip6h), &nexthdr);
if (offset < 0 || nexthdr != IPPROTO_ICMPV6)
return 0;
/* Okay, we found ICMPv6 header */
skb2 = skb_clone(skb, GFP_ATOMIC);
if (!skb2)
return -ENOMEM;
len -= offset - skb_network_offset(skb2);
__skb_pull(skb2, offset);
skb_reset_transport_header(skb2);
err = -EINVAL;
if (!pskb_may_pull(skb2, sizeof(*icmp6h)))
goto out;
icmp6h = icmp6_hdr(skb2);
switch (icmp6h->icmp6_type) {
case ICMPV6_MGM_QUERY:
case ICMPV6_MGM_REPORT:
case ICMPV6_MGM_REDUCTION:
case ICMPV6_MLD2_REPORT:
break;
default:
err = 0;
goto out;
}
/* Okay, we found MLD message. Check further. */
if (skb2->len > len) {
err = pskb_trim_rcsum(skb2, len);
if (err)
goto out;
}
switch (skb2->ip_summed) {
case CHECKSUM_COMPLETE:
if (!csum_fold(skb2->csum))
break;
/*FALLTHROUGH*/
case CHECKSUM_NONE:
skb2->csum = 0;
if (skb_checksum_complete(skb2))
goto out;
}
err = 0;
BR_INPUT_SKB_CB(skb)->igmp = 1;
switch (icmp6h->icmp6_type) {
case ICMPV6_MGM_REPORT:
{
struct mld_msg *mld = (struct mld_msg *)icmp6h;
BR_INPUT_SKB_CB(skb2)->mrouters_only = 1;
err = br_ip6_multicast_add_group(br, port, &mld->mld_mca);
break;
}
case ICMPV6_MLD2_REPORT:
err = br_ip6_multicast_mld2_report(br, port, skb2);
break;
case ICMPV6_MGM_QUERY:
err = br_ip6_multicast_query(br, port, skb2);
break;
case ICMPV6_MGM_REDUCTION:
{
struct mld_msg *mld = (struct mld_msg *)icmp6h;
br_ip6_multicast_leave_group(br, port, &mld->mld_mca);
}
}
out:
__skb_push(skb2, offset);
if (skb2 != skb)
kfree_skb(skb2);
return err;
}
#endif
int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
struct sk_buff *skb)
{
@ -1138,6 +1556,10 @@ int br_multicast_rcv(struct net_bridge *br, struct net_bridge_port *port,
switch (skb->protocol) {
case htons(ETH_P_IP):
return br_multicast_ipv4_rcv(br, port, skb);
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
case htons(ETH_P_IPV6):
return br_multicast_ipv6_rcv(br, port, skb);
#endif
}
return 0;

3
net/bridge/br_private.h
View File

@ -49,6 +49,9 @@ struct br_ip
{
union {
__be32 ip4;
#if defined(CONFIG_IPV6) || defined(CONFIG_IPV6_MODULE)
struct in6_addr ip6;
#endif
} u;
__be16 proto;
};