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[IPV6] MROUTE: Support PIM-SM (SSM).

Browse source 
Based on ancient patch by Mickael Hoerdt
<hoerdt@clarinet.u-strasbg.fr>, which is available at
<http://www-r2.u-strasbg.fr/~hoerdt/dev/linux_ipv6_mforwarding/patch-linux-ipv6-mforwarding-0.1a>.

Signed-off-by: YOSHIFUJI Hideaki <yoshfuji@linux-ipv6.org>
This commit is contained in:
YOSHIFUJI Hideaki 2008-04-03 09:22:54 +09:00
parent 7bc570c8b4
commit 14fb64e1f4
3 changed files with 285 additions and 1 deletions
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4
include/linux/mroute6.h
View file

@ -23,6 +23,8 @@
#define MRT6_ADD_MFC (MRT6_BASE+4) /* Add a multicast forwarding entry */
#define MRT6_DEL_MFC (MRT6_BASE+5) /* Delete a multicast forwarding entry */
#define MRT6_VERSION (MRT6_BASE+6) /* Get the kernel multicast version */
#define MRT6_ASSERT (MRT6_BASE+7) /* Activate PIM assert mode */
#define MRT6_PIM (MRT6_BASE+8) /* enable PIM code */
#define SIOCGETMIFCNT_IN6 SIOCPROTOPRIVATE /* IP protocol privates */
#define SIOCGETSGCNT_IN6 (SIOCPROTOPRIVATE+1)
@ -217,6 +219,8 @@ static inline int ip6mr_sk_done(struct sock *sk) { return 0; }
struct mrt6msg {
#define MRT6MSG_NOCACHE 1
#define MRT6MSG_WRONGMIF 2
#define MRT6MSG_WHOLEPKT 3 /* used for use level encap */
__u8 im6_mbz; /* must be zero */
__u8 im6_msgtype; /* what type of message */
__u16 im6_mif; /* mif rec'd on */

7
net/ipv6/Kconfig
View file

@ -216,3 +216,10 @@ config IPV6_MROUTE
Experimental support for IPv6 multicast forwarding.
If unsure, say N.
config IPV6_PIMSM_V2
bool "IPv6: PIM-SM version 2 support (EXPERIMENTAL)"
depends on IPV6_MROUTE
---help---
Support for IPv6 PIM multicast routing protocol PIM-SMv2.
If unsure, say N.

275
net/ipv6/ip6mr.c
View file

@ -54,6 +54,7 @@
#include <net/ipv6.h>
#include <net/ip6_route.h>
#include <linux/mroute6.h>
#include <linux/pim.h>
#include <net/addrconf.h>
#include <linux/netfilter_ipv6.h>
@ -75,6 +76,13 @@ static int maxvif;
#define MIF_EXISTS(idx) (vif6_table[idx].dev != NULL)
static int mroute_do_assert; /* Set in PIM assert */
#ifdef CONFIG_IPV6_PIMSM_V2
static int mroute_do_pim;
#else
#define mroute_do_pim 0
#endif
static struct mfc6_cache *mfc6_cache_array[MFC_LINES]; /* Forwarding cache */
static struct mfc6_cache *mfc_unres_queue; /* Queue of unresolved entries */
@ -97,6 +105,10 @@ static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache);
static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert);
static int ip6mr_fill_mroute(struct sk_buff *skb, struct mfc6_cache *c, struct rtmsg *rtm);
#ifdef CONFIG_IPV6_PIMSM_V2
static struct inet6_protocol pim6_protocol;
#endif
static struct timer_list ipmr_expire_timer;
@ -339,6 +351,132 @@ static struct file_operations ip6mr_mfc_fops = {
};
#endif
#ifdef CONFIG_IPV6_PIMSM_V2
static int reg_vif_num = -1;
static int pim6_rcv(struct sk_buff *skb)
{
struct pimreghdr *pim;
struct ipv6hdr *encap;
struct net_device *reg_dev = NULL;
if (!pskb_may_pull(skb, sizeof(*pim) + sizeof(*encap)))
goto drop;
pim = (struct pimreghdr *)skb_transport_header(skb);
if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
(pim->flags & PIM_NULL_REGISTER) ||
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
(u16)csum_fold(skb_checksum(skb, 0, skb->len, 0))))
goto drop;
/* check if the inner packet is destined to mcast group */
encap = (struct ipv6hdr *)(skb_transport_header(skb) +
sizeof(*pim));
if (!ipv6_addr_is_multicast(&encap->daddr) ||
encap->payload_len == 0 ||
ntohs(encap->payload_len) + sizeof(*pim) > skb->len)
goto drop;
read_lock(&mrt_lock);
if (reg_vif_num >= 0)
reg_dev = vif6_table[reg_vif_num].dev;
if (reg_dev)
dev_hold(reg_dev);
read_unlock(&mrt_lock);
if (reg_dev == NULL)
goto drop;
skb->mac_header = skb->network_header;
skb_pull(skb, (u8 *)encap - skb->data);
skb_reset_network_header(skb);
skb->dev = reg_dev;
skb->protocol = htons(ETH_P_IP);
skb->ip_summed = 0;
skb->pkt_type = PACKET_HOST;
dst_release(skb->dst);
((struct net_device_stats *)netdev_priv(reg_dev))->rx_bytes += skb->len;
((struct net_device_stats *)netdev_priv(reg_dev))->rx_packets++;
skb->dst = NULL;
nf_reset(skb);
netif_rx(skb);
dev_put(reg_dev);
return 0;
drop:
kfree_skb(skb);
return 0;
}
static struct inet6_protocol pim6_protocol = {
.handler = pim6_rcv,
};
/* Service routines creating virtual interfaces: PIMREG */
static int reg_vif_xmit(struct sk_buff *skb, struct net_device *dev)
{
read_lock(&mrt_lock);
((struct net_device_stats *)netdev_priv(dev))->tx_bytes += skb->len;
((struct net_device_stats *)netdev_priv(dev))->tx_packets++;
ip6mr_cache_report(skb, reg_vif_num, MRT6MSG_WHOLEPKT);
read_unlock(&mrt_lock);
kfree_skb(skb);
return 0;
}
static struct net_device_stats *reg_vif_get_stats(struct net_device *dev)
{
return (struct net_device_stats *)netdev_priv(dev);
}
static void reg_vif_setup(struct net_device *dev)
{
dev->type = ARPHRD_PIMREG;
dev->mtu = 1500 - sizeof(struct ipv6hdr) - 8;
dev->flags = IFF_NOARP;
dev->hard_start_xmit = reg_vif_xmit;
dev->get_stats = reg_vif_get_stats;
dev->destructor = free_netdev;
}
static struct net_device *ip6mr_reg_vif(void)
{
struct net_device *dev;
struct inet6_dev *in_dev;
dev = alloc_netdev(sizeof(struct net_device_stats), "pim6reg",
reg_vif_setup);
if (dev == NULL)
return NULL;
if (register_netdevice(dev)) {
free_netdev(dev);
return NULL;
}
dev->iflink = 0;
in_dev = ipv6_find_idev(dev);
if (!in_dev)
goto failure;
if (dev_open(dev))
goto failure;
return dev;
failure:
/* allow the register to be completed before unregistering. */
rtnl_unlock();
rtnl_lock();
unregister_netdevice(dev);
return NULL;
}
#endif
/*
* Delete a VIF entry
*/
@ -361,6 +499,11 @@ static int mif6_delete(int vifi)
return -EADDRNOTAVAIL;
}
#ifdef CONFIG_IPV6_PIMSM_V2
if (vifi == reg_vif_num)
reg_vif_num = -1;
#endif
if (vifi + 1 == maxvif) {
int tmp;
for (tmp = vifi - 1; tmp >= 0; tmp--) {
@ -480,6 +623,19 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
return -EADDRINUSE;
switch (vifc->mif6c_flags) {
#ifdef CONFIG_IPV6_PIMSM_V2
case MIFF_REGISTER:
/*
* Special Purpose VIF in PIM
* All the packets will be sent to the daemon
*/
if (reg_vif_num >= 0)
return -EADDRINUSE;
dev = ip6mr_reg_vif();
if (!dev)
return -ENOBUFS;
break;
#endif
case 0:
dev = dev_get_by_index(&init_net, vifc->mif6c_pifi);
if (!dev)
@ -512,6 +668,10 @@ static int mif6_add(struct mif6ctl *vifc, int mrtsock)
write_lock_bh(&mrt_lock);
dev_hold(dev);
v->dev = dev;
#ifdef CONFIG_IPV6_PIMSM_V2
if (v->flags & MIFF_REGISTER)
reg_vif_num = vifi;
#endif
if (vifi + 1 > maxvif)
maxvif = vifi + 1;
write_unlock_bh(&mrt_lock);
@ -599,7 +759,13 @@ static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
struct mrt6msg *msg;
int ret;
skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
#ifdef CONFIG_IPV6_PIMSM_V2
if (assert == MRT6MSG_WHOLEPKT)
skb = skb_realloc_headroom(pkt, -skb_network_offset(pkt)
+sizeof(*msg));
else
#endif
skb = alloc_skb(sizeof(struct ipv6hdr) + sizeof(*msg), GFP_ATOMIC);
if (!skb)
return -ENOBUFS;
@ -609,6 +775,29 @@ static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
skb->ip_summed = CHECKSUM_UNNECESSARY;
#ifdef CONFIG_IPV6_PIMSM_V2
if (assert == MRT6MSG_WHOLEPKT) {
/* Ugly, but we have no choice with this interface.
Duplicate old header, fix length etc.
And all this only to mangle msg->im6_msgtype and
to set msg->im6_mbz to "mbz" :-)
*/
skb_push(skb, -skb_network_offset(pkt));
skb_push(skb, sizeof(*msg));
skb_reset_transport_header(skb);
msg = (struct mrt6msg *)skb_transport_header(skb);
msg->im6_mbz = 0;
msg->im6_msgtype = MRT6MSG_WHOLEPKT;
msg->im6_mif = reg_vif_num;
msg->im6_pad = 0;
ipv6_addr_copy(&msg->im6_src, &ipv6_hdr(pkt)->saddr);
ipv6_addr_copy(&msg->im6_dst, &ipv6_hdr(pkt)->daddr);
skb->ip_summed = CHECKSUM_UNNECESSARY;
} else
#endif
{
/*
* Copy the IP header
*/
@ -635,6 +824,7 @@ static int ip6mr_cache_report(struct sk_buff *pkt, vifi_t vifi, int assert)
skb->ip_summed = CHECKSUM_UNNECESSARY;
skb_pull(skb, sizeof(struct ipv6hdr));
}
if (mroute6_socket == NULL) {
kfree_skb(skb);
@ -1033,6 +1223,44 @@ int ip6_mroute_setsockopt(struct sock *sk, int optname, char __user *optval, int
rtnl_unlock();
return ret;
/*
* Control PIM assert (to activate pim will activate assert)
*/
case MRT6_ASSERT:
{
int v;
if (get_user(v, (int __user *)optval))
return -EFAULT;
mroute_do_assert = !!v;
return 0;
}
#ifdef CONFIG_IPV6_PIMSM_V2
case MRT6_PIM:
{
int v, ret;
if (get_user(v, (int __user *)optval))
return -EFAULT;
v = !!v;
rtnl_lock();
ret = 0;
if (v != mroute_do_pim) {
mroute_do_pim = v;
mroute_do_assert = v;
if (mroute_do_pim)
ret = inet6_add_protocol(&pim6_protocol,
IPPROTO_PIM);
else
ret = inet6_del_protocol(&pim6_protocol,
IPPROTO_PIM);
if (ret < 0)
ret = -EAGAIN;
}
rtnl_unlock();
return ret;
}
#endif
/*
* Spurious command, or MRT_VERSION which you cannot
* set.
@ -1056,6 +1284,14 @@ int ip6_mroute_getsockopt(struct sock *sk, int optname, char __user *optval,
case MRT6_VERSION:
val = 0x0305;
break;
#ifdef CONFIG_IPV6_PIMSM_V2
case MRT6_PIM:
val = mroute_do_pim;
break;
#endif
case MRT6_ASSERT:
val = mroute_do_assert;
break;
default:
return -ENOPROTOOPT;
}
@ -1151,6 +1387,18 @@ static int ip6mr_forward2(struct sk_buff *skb, struct mfc6_cache *c, int vifi)
if (vif->dev == NULL)
goto out_free;
#ifdef CONFIG_IPV6_PIMSM_V2
if (vif->flags & MIFF_REGISTER) {
vif->pkt_out++;
vif->bytes_out += skb->len;
((struct net_device_stats *)netdev_priv(vif->dev))->tx_bytes += skb->len;
((struct net_device_stats *)netdev_priv(vif->dev))->tx_packets++;
ip6mr_cache_report(skb, vifi, MRT6MSG_WHOLEPKT);
kfree_skb(skb);
return 0;
}
#endif
ipv6h = ipv6_hdr(skb);
fl = (struct flowi) {
@ -1220,6 +1468,30 @@ static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
cache->mfc_un.res.pkt++;
cache->mfc_un.res.bytes += skb->len;
/*
* Wrong interface: drop packet and (maybe) send PIM assert.
*/
if (vif6_table[vif].dev != skb->dev) {
int true_vifi;
cache->mfc_un.res.wrong_if++;
true_vifi = ip6mr_find_vif(skb->dev);
if (true_vifi >= 0 && mroute_do_assert &&
/* pimsm uses asserts, when switching from RPT to SPT,
so that we cannot check that packet arrived on an oif.
It is bad, but otherwise we would need to move pretty
large chunk of pimd to kernel. Ough... --ANK
*/
(mroute_do_pim || cache->mfc_un.res.ttls[true_vifi] < 255) &&
time_after(jiffies,
cache->mfc_un.res.last_assert + MFC_ASSERT_THRESH)) {
cache->mfc_un.res.last_assert = jiffies;
ip6mr_cache_report(skb, true_vifi, MRT6MSG_WRONGMIF);
}
goto dont_forward;
}
vif6_table[vif].pkt_in++;
vif6_table[vif].bytes_in += skb->len;
@ -1241,6 +1513,7 @@ static int ip6_mr_forward(struct sk_buff *skb, struct mfc6_cache *cache)
return 0;
}
dont_forward:
kfree_skb(skb);
return 0;
}