81 lines
3 KiB
Diff
81 lines
3 KiB
Diff
From fed8c3db10bc9d3a1e799a774924c00522595d0c Mon Sep 17 00:00:00 2001
|
|
From: Evgeny Yurchenko <evg.yurch@rogers.com>
|
|
Date: Mon, 4 Jan 2010 05:13:59 +0500
|
|
Subject: [PATCH 1/3] Send IGMP packets with IP Router Alert option [RFC 2113]
|
|
included in IP header
|
|
|
|
---
|
|
src/igmp.c | 17 ++++++++++++-----
|
|
src/igmpproxy.h | 1 +
|
|
2 files changed, 13 insertions(+), 5 deletions(-)
|
|
|
|
diff --git a/src/igmp.c b/src/igmp.c
|
|
index a0cd27d..b547688 100644
|
|
--- a/src/igmp.c
|
|
+++ b/src/igmp.c
|
|
@@ -67,7 +67,7 @@ void initIgmp() {
|
|
* - Checksum (let the kernel fill it in)
|
|
*/
|
|
ip->ip_v = IPVERSION;
|
|
- ip->ip_hl = sizeof(struct ip) >> 2;
|
|
+ ip->ip_hl = (sizeof(struct ip) + 4) >> 2; /* +4 for Router Alert option */
|
|
ip->ip_tos = 0xc0; /* Internet Control */
|
|
ip->ip_ttl = MAXTTL; /* applies to unicasts only */
|
|
ip->ip_p = IPPROTO_IGMP;
|
|
@@ -213,7 +213,7 @@ void buildIgmp(uint32_t src, uint32_t dst, int type, int code, uint32_t group, i
|
|
ip = (struct ip *)send_buf;
|
|
ip->ip_src.s_addr = src;
|
|
ip->ip_dst.s_addr = dst;
|
|
- ip_set_len(ip, MIN_IP_HEADER_LEN + IGMP_MINLEN + datalen);
|
|
+ ip_set_len(ip, IP_HEADER_RAOPT_LEN + IGMP_MINLEN + datalen);
|
|
|
|
if (IN_MULTICAST(ntohl(dst))) {
|
|
ip->ip_ttl = curttl;
|
|
@@ -221,13 +221,20 @@ void buildIgmp(uint32_t src, uint32_t dst, int type, int code, uint32_t group, i
|
|
ip->ip_ttl = MAXTTL;
|
|
}
|
|
|
|
- igmp = (struct igmp *)(send_buf + MIN_IP_HEADER_LEN);
|
|
+ /* Add Router Alert option */
|
|
+ ((u_char*)send_buf+MIN_IP_HEADER_LEN)[0] = IPOPT_RA;
|
|
+ ((u_char*)send_buf+MIN_IP_HEADER_LEN)[1] = 0x04;
|
|
+ ((u_char*)send_buf+MIN_IP_HEADER_LEN)[2] = 0x00;
|
|
+ ((u_char*)send_buf+MIN_IP_HEADER_LEN)[3] = 0x00;
|
|
+
|
|
+ igmp = (struct igmp *)(send_buf + IP_HEADER_RAOPT_LEN);
|
|
igmp->igmp_type = type;
|
|
igmp->igmp_code = code;
|
|
igmp->igmp_group.s_addr = group;
|
|
igmp->igmp_cksum = 0;
|
|
igmp->igmp_cksum = inetChksum((u_short *)igmp,
|
|
- IGMP_MINLEN + datalen);
|
|
+ IP_HEADER_RAOPT_LEN + datalen);
|
|
+
|
|
}
|
|
|
|
/*
|
|
@@ -257,7 +264,7 @@ void sendIgmp(uint32_t src, uint32_t dst, int type, int code, uint32_t group, in
|
|
#endif
|
|
sdst.sin_addr.s_addr = dst;
|
|
if (sendto(MRouterFD, send_buf,
|
|
- MIN_IP_HEADER_LEN + IGMP_MINLEN + datalen, 0,
|
|
+ IP_HEADER_RAOPT_LEN + IGMP_MINLEN + datalen, 0,
|
|
(struct sockaddr *)&sdst, sizeof(sdst)) < 0) {
|
|
if (errno == ENETDOWN)
|
|
my_log(LOG_ERR, errno, "Sender VIF was down.");
|
|
diff --git a/src/igmpproxy.h b/src/igmpproxy.h
|
|
index 0de7791..4df8a79 100644
|
|
--- a/src/igmpproxy.h
|
|
+++ b/src/igmpproxy.h
|
|
@@ -64,6 +64,7 @@
|
|
#define MAX_IP_PACKET_LEN 576
|
|
#define MIN_IP_HEADER_LEN 20
|
|
#define MAX_IP_HEADER_LEN 60
|
|
+#define IP_HEADER_RAOPT_LEN 24
|
|
|
|
#define MAX_MC_VIFS 32 // !!! check this const in the specific includes
|
|
|
|
--
|
|
1.7.8.1
|
|
|