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-rw-r--r--include/linux/pim.h81
-rw-r--r--net/bridge/br_multicast.c22
-rw-r--r--net/ipv4/ipmr.c2
-rw-r--r--net/ipv6/ip6mr.c2
4 files changed, 95 insertions, 12 deletions
diff --git a/include/linux/pim.h b/include/linux/pim.h
index e1d756f81348..0e81b2778ae0 100644
--- a/include/linux/pim.h
+++ b/include/linux/pim.h
@@ -1,6 +1,7 @@
#ifndef __LINUX_PIM_H
#define __LINUX_PIM_H
+#include <linux/skbuff.h>
#include <asm/byteorder.h>
/* Message types - V1 */
@@ -9,24 +10,86 @@
/* Message types - V2 */
#define PIM_VERSION 2
-#define PIM_REGISTER 1
+
+/* RFC7761, sec 4.9:
+ * Type
+ * Types for specific PIM messages. PIM Types are:
+ *
+ * Message Type Destination
+ * ---------------------------------------------------------------------
+ * 0 = Hello Multicast to ALL-PIM-ROUTERS
+ * 1 = Register Unicast to RP
+ * 2 = Register-Stop Unicast to source of Register
+ * packet
+ * 3 = Join/Prune Multicast to ALL-PIM-ROUTERS
+ * 4 = Bootstrap Multicast to ALL-PIM-ROUTERS
+ * 5 = Assert Multicast to ALL-PIM-ROUTERS
+ * 6 = Graft (used in PIM-DM only) Unicast to RPF'(S)
+ * 7 = Graft-Ack (used in PIM-DM only) Unicast to source of Graft
+ * packet
+ * 8 = Candidate-RP-Advertisement Unicast to Domain's BSR
+ */
+enum {
+ PIM_TYPE_HELLO,
+ PIM_TYPE_REGISTER,
+ PIM_TYPE_REGISTER_STOP,
+ PIM_TYPE_JOIN_PRUNE,
+ PIM_TYPE_BOOTSTRAP,
+ PIM_TYPE_ASSERT,
+ PIM_TYPE_GRAFT,
+ PIM_TYPE_GRAFT_ACK,
+ PIM_TYPE_CANDIDATE_RP_ADV
+};
#define PIM_NULL_REGISTER cpu_to_be32(0x40000000)
-static inline bool ipmr_pimsm_enabled(void)
-{
- return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
-}
+/* RFC7761, sec 4.9:
+ * The PIM header common to all PIM messages is:
+ * 0 1 2 3
+ * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ * |PIM Ver| Type | Reserved | Checksum |
+ * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
+ */
+struct pimhdr {
+ __u8 type;
+ __u8 reserved;
+ __be16 csum;
+};
/* PIMv2 register message header layout (ietf-draft-idmr-pimvsm-v2-00.ps */
-struct pimreghdr
-{
+struct pimreghdr {
__u8 type;
__u8 reserved;
__be16 csum;
__be32 flags;
};
-struct sk_buff;
-extern int pim_rcv_v1(struct sk_buff *);
+int pim_rcv_v1(struct sk_buff *skb);
+
+static inline bool ipmr_pimsm_enabled(void)
+{
+ return IS_BUILTIN(CONFIG_IP_PIMSM_V1) || IS_BUILTIN(CONFIG_IP_PIMSM_V2);
+}
+
+static inline struct pimhdr *pim_hdr(const struct sk_buff *skb)
+{
+ return (struct pimhdr *)skb_transport_header(skb);
+}
+
+static inline u8 pim_hdr_version(const struct pimhdr *pimhdr)
+{
+ return pimhdr->type >> 4;
+}
+
+static inline u8 pim_hdr_type(const struct pimhdr *pimhdr)
+{
+ return pimhdr->type & 0xf;
+}
+
+/* check if the address is 224.0.0.13, RFC7761 sec 4.3.1 */
+static inline bool pim_ipv4_all_pim_routers(__be32 addr)
+{
+ return addr == htonl(0xE000000D);
+}
#endif
diff --git a/net/bridge/br_multicast.c b/net/bridge/br_multicast.c
index 2136e45f5277..073d54afa056 100644
--- a/net/bridge/br_multicast.c
+++ b/net/bridge/br_multicast.c
@@ -25,6 +25,7 @@
#include <linux/slab.h>
#include <linux/timer.h>
#include <linux/inetdevice.h>
+#include <linux/mroute.h>
#include <net/ip.h>
#if IS_ENABLED(CONFIG_IPV6)
#include <net/ipv6.h>
@@ -1638,6 +1639,21 @@ static void br_multicast_err_count(const struct net_bridge *br,
u64_stats_update_end(&pstats->syncp);
}
+static void br_multicast_pim(struct net_bridge *br,
+ struct net_bridge_port *port,
+ const struct sk_buff *skb)
+{
+ unsigned int offset = skb_transport_offset(skb);
+ struct pimhdr *pimhdr, _pimhdr;
+
+ pimhdr = skb_header_pointer(skb, offset, sizeof(_pimhdr), &_pimhdr);
+ if (!pimhdr || pim_hdr_version(pimhdr) != PIM_VERSION ||
+ pim_hdr_type(pimhdr) != PIM_TYPE_HELLO)
+ return;
+
+ br_multicast_mark_router(br, port);
+}
+
static int br_multicast_ipv4_rcv(struct net_bridge *br,
struct net_bridge_port *port,
struct sk_buff *skb,
@@ -1650,8 +1666,12 @@ static int br_multicast_ipv4_rcv(struct net_bridge *br,
err = ip_mc_check_igmp(skb, &skb_trimmed);
if (err == -ENOMSG) {
- if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr))
+ if (!ipv4_is_local_multicast(ip_hdr(skb)->daddr)) {
BR_INPUT_SKB_CB(skb)->mrouters_only = 1;
+ } else if (pim_ipv4_all_pim_routers(ip_hdr(skb)->daddr)) {
+ if (ip_hdr(skb)->protocol == IPPROTO_PIM)
+ br_multicast_pim(br, port, skb);
+ }
return 0;
} else if (err < 0) {
br_multicast_err_count(br, port, skb->protocol);
diff --git a/net/ipv4/ipmr.c b/net/ipv4/ipmr.c
index 5f006e13de56..51d71a70fbbe 100644
--- a/net/ipv4/ipmr.c
+++ b/net/ipv4/ipmr.c
@@ -2053,7 +2053,7 @@ static int pim_rcv(struct sk_buff *skb)
goto drop;
pim = (struct pimreghdr *)skb_transport_header(skb);
- if (pim->type != ((PIM_VERSION << 4) | (PIM_REGISTER)) ||
+ if (pim->type != ((PIM_VERSION << 4) | (PIM_TYPE_REGISTER)) ||
(pim->flags & PIM_NULL_REGISTER) ||
(ip_compute_csum((void *)pim, sizeof(*pim)) != 0 &&
csum_fold(skb_checksum(skb, 0, skb->len, 0))))
diff --git a/net/ipv6/ip6mr.c b/net/ipv6/ip6mr.c
index 7f4265b1649b..52101b37ad6e 100644
--- a/net/ipv6/ip6mr.c
+++ b/net/ipv6/ip6mr.c
@@ -636,7 +636,7 @@ static int pim6_rcv(struct sk_buff *skb)
goto drop;
pim = (struct pimreghdr *)skb_transport_header(skb);
- if (pim->type != ((PIM_VERSION << 4) | PIM_REGISTER) ||
+ if (pim->type != ((PIM_VERSION << 4) | PIM_TYPE_REGISTER) ||
(pim->flags & PIM_NULL_REGISTER) ||
(csum_ipv6_magic(&ipv6_hdr(skb)->saddr, &ipv6_hdr(skb)->daddr,
sizeof(*pim), IPPROTO_PIM,
generated by cgit v1.2.3 (git 2.0.4) at 2024-10-10 07:19:15 +0000