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IGMP protocol now uses the generic background protocol mechanism.
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159
src/core/nic.c
159
src/core/nic.c
@ -21,13 +21,10 @@ Literature dealing with the network protocols:
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#include "resolv.h"
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#include "dev.h"
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#include "nic.h"
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#include "background.h"
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#include "elf.h" /* FOR EM_CURRENT */
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struct arptable_t arptable[MAX_ARP];
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#if MULTICAST_LEVEL2
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unsigned long last_igmpv1 = 0;
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struct igmptable_t igmptable[MAX_IGMP];
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#endif
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/* Put rom_info in .nocompress section so romprefix.S can write to it */
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struct rom_info rom __attribute__ ((section (".text16.nocompress"))) = {0,0};
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static unsigned long netmask;
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@ -827,140 +824,6 @@ uint16_t tcpudpchksum(struct iphdr *ip)
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return checksum;
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}
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#ifdef MULTICAST_LEVEL2
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static void send_igmp_reports(unsigned long now)
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{
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int i;
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for(i = 0; i < MAX_IGMP; i++) {
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if (igmptable[i].time && (now >= igmptable[i].time)) {
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struct igmp_ip_t igmp;
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igmp.router_alert[0] = 0x94;
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igmp.router_alert[1] = 0x04;
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igmp.router_alert[2] = 0;
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igmp.router_alert[3] = 0;
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build_ip_hdr(igmptable[i].group.s_addr,
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1, IP_IGMP, sizeof(igmp.router_alert), sizeof(igmp), &igmp);
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igmp.igmp.type = IGMPv2_REPORT;
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if (last_igmpv1 &&
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(now < last_igmpv1 + IGMPv1_ROUTER_PRESENT_TIMEOUT)) {
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igmp.igmp.type = IGMPv1_REPORT;
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}
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igmp.igmp.response_time = 0;
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igmp.igmp.chksum = 0;
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igmp.igmp.group.s_addr = igmptable[i].group.s_addr;
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igmp.igmp.chksum = ipchksum(&igmp.igmp, sizeof(igmp.igmp));
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ip_transmit(sizeof(igmp), &igmp);
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#ifdef MDEBUG
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printf("Sent IGMP report to: %@\n", igmp.igmp.group.s_addr);
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#endif
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/* Don't send another igmp report until asked */
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igmptable[i].time = 0;
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}
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}
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}
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static void process_igmp(struct iphdr *ip, unsigned long now)
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{
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struct igmp *igmp;
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int i;
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unsigned iplen;
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if (!ip || (ip->protocol == IP_IGMP) ||
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(nic.packetlen < sizeof(struct iphdr) + sizeof(struct igmp))) {
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return;
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}
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iplen = (ip->verhdrlen & 0xf)*4;
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igmp = (struct igmp *)&nic.packet[sizeof(struct iphdr)];
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if (ipchksum(igmp, ntohs(ip->len) - iplen) != 0)
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return;
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if ((igmp->type == IGMP_QUERY) &&
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(ip->dest.s_addr == htonl(GROUP_ALL_HOSTS))) {
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unsigned long interval = IGMP_INTERVAL;
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if (igmp->response_time == 0) {
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last_igmpv1 = now;
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} else {
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interval = (igmp->response_time * TICKS_PER_SEC)/10;
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}
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#ifdef MDEBUG
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printf("Received IGMP query for: %@\n", igmp->group.s_addr);
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#endif
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for(i = 0; i < MAX_IGMP; i++) {
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uint32_t group = igmptable[i].group.s_addr;
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if ((group == 0) || (group == igmp->group.s_addr)) {
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unsigned long time;
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time = currticks() + rfc1112_sleep_interval(interval, 0);
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if (time < igmptable[i].time) {
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igmptable[i].time = time;
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}
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}
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}
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}
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if (((igmp->type == IGMPv1_REPORT) || (igmp->type == IGMPv2_REPORT)) &&
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(ip->dest.s_addr == igmp->group.s_addr)) {
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#ifdef MDEBUG
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printf("Received IGMP report for: %@\n", igmp->group.s_addr);
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#endif
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for(i = 0; i < MAX_IGMP; i++) {
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if ((igmptable[i].group.s_addr == igmp->group.s_addr) &&
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igmptable[i].time != 0) {
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igmptable[i].time = 0;
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}
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}
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}
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}
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void leave_group(int slot)
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{
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/* Be very stupid and always send a leave group message if
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* I have subscribed. Imperfect but it is standards
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* compliant, easy and reliable to implement.
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*
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* The optimal group leave method is to only send leave when,
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* we were the last host to respond to a query on this group,
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* and igmpv1 compatibility is not enabled.
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*/
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if (igmptable[slot].group.s_addr) {
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struct igmp_ip_t igmp;
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igmp.router_alert[0] = 0x94;
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igmp.router_alert[1] = 0x04;
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igmp.router_alert[2] = 0;
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igmp.router_alert[3] = 0;
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build_ip_hdr(htonl(GROUP_ALL_HOSTS),
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1, IP_IGMP, sizeof(igmp.router_alert), sizeof(igmp), &igmp);
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igmp.igmp.type = IGMP_LEAVE;
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igmp.igmp.response_time = 0;
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igmp.igmp.chksum = 0;
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igmp.igmp.group.s_addr = igmptable[slot].group.s_addr;
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igmp.igmp.chksum = ipchksum(&igmp.igmp, sizeof(igmp));
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ip_transmit(sizeof(igmp), &igmp);
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#ifdef MDEBUG
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printf("Sent IGMP leave for: %@\n", igmp.igmp.group.s_addr);
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#endif
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}
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memset(&igmptable[slot], 0, sizeof(igmptable[0]));
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}
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void join_group(int slot, unsigned long group)
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{
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/* I have already joined */
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if (igmptable[slot].group.s_addr == group)
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return;
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if (igmptable[slot].group.s_addr) {
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leave_group(slot);
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}
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/* Only join a group if we are given a multicast ip, this way
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* code can be given a non-multicast (broadcast or unicast ip)
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* and still work...
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*/
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if ((group & htonl(MULTICAST_MASK)) == htonl(MULTICAST_NETWORK)) {
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igmptable[slot].group.s_addr = group;
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igmptable[slot].time = currticks();
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}
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}
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#else
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#define send_igmp_reports(now) do {} while(0)
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#define process_igmp(ip, now) do {} while(0)
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#endif
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#include "proto_eth_slow.c"
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@ -985,8 +848,8 @@ int await_reply(reply_t reply, int ival, void *ptr, long timeout)
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*/
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for (;;) {
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now = currticks();
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background_send(now);
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send_eth_slow_reports(now);
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send_igmp_reports(now);
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result = eth_poll(1);
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if (result == 0) {
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/* We don't have anything */
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@ -1104,8 +967,8 @@ int await_reply(reply_t reply, int ival, void *ptr, long timeout)
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#endif /* MDEBUG */
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}
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}
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background_process(now, ptype, ip);
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process_eth_slow(ptype, now);
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process_igmp(ip, now);
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}
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return(0);
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}
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@ -1297,20 +1160,4 @@ long rfc2131_sleep_interval(long base, int exp)
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return tmo;
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}
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#ifdef MULTICAST_LEVEL2
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/**************************************************************************
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RFC1112_SLEEP_INTERVAL - sleep for expotentially longer times, up to (base << exp)
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**************************************************************************/
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long rfc1112_sleep_interval(long base, int exp)
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{
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unsigned long divisor, tmo;
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#ifdef BACKOFF_LIMIT
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if (exp > BACKOFF_LIMIT)
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exp = BACKOFF_LIMIT;
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#endif
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divisor = RAND_MAX/(base << exp);
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tmo = random()/divisor;
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return tmo;
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}
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#endif /* MULTICAST_LEVEL_2 */
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@ -130,16 +130,11 @@ enum {
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MAX_ARP
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};
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#define IGMP_SERVER 0
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#define MAX_IGMP IGMP_SERVER+1
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#define RARP_REQUEST 3
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#define RARP_REPLY 4
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#include "in.h"
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#define MULTICAST_MASK 0xF0000000
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#define MULTICAST_NETWORK 0xE0000000
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/* Helper macros used to identify when DHCP options are valid/invalid in/outside of encapsulation */
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#define NON_ENCAP_OPT in_encapsulated_options == 0 &&
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@ -164,11 +159,6 @@ struct arptable_t {
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uint8_t node[6];
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} PACKED;
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struct igmptable_t {
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in_addr group;
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unsigned long time;
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} PACKED;
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#define KERNEL_BUF (BOOTP_DATA_ADDR->bootp_reply.bp_file)
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#define FLOPPY_BOOT_LOCATION 0x7c00
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@ -214,14 +204,11 @@ int tcp_reset(struct iphdr *ip);
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typedef int (*reply_t)(int ival, void *ptr, unsigned short ptype, struct iphdr *ip, struct udphdr *udp, struct tcphdr *tcp);
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extern int await_reply P((reply_t reply, int ival, void *ptr, long timeout));
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extern int decode_rfc1533 P((unsigned char *, unsigned int, unsigned int, int));
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extern void join_group(int slot, unsigned long group);
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extern void leave_group(int slot);
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#define RAND_MAX 2147483647L
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extern uint16_t ipchksum P((const void *ip, unsigned long len));
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extern uint16_t add_ipchksums P((unsigned long offset, uint16_t sum, uint16_t new));
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extern int32_t random P((void));
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extern long rfc2131_sleep_interval P((long base, int exp));
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extern long rfc1112_sleep_interval P((long base, int exp));
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extern void cleanup P((void));
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/* osloader.c */
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@ -1,5 +1,8 @@
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#ifndef _IGMP_H
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#define _IGMP_H
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#ifndef IGMP_H
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#define IGMP_H
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#include "stdint.h"
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#include "in.h"
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#define IGMP_QUERY 0x11
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#define IGMPv1_REPORT 0x12
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@ -7,11 +10,19 @@
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#define IGMP_LEAVE 0x17
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#define GROUP_ALL_HOSTS 0xe0000001 /* 224.0.0.1 Host byte order */
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#define MULTICAST_MASK 0xf0000000
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#define MULTICAST_NETWORK 0xe0000000
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enum {
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IGMP_SERVER,
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MAX_IGMP
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};
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struct igmp {
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uint8_t type;
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uint8_t response_time;
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uint16_t chksum;
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in_addr group;
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uint8_t type;
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uint8_t response_time;
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uint16_t chksum;
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struct in_addr group;
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} PACKED;
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struct igmp_ip_t { /* Format of an igmp ip packet */
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@ -20,4 +31,12 @@ struct igmp_ip_t { /* Format of an igmp ip packet */
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struct igmp igmp;
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} PACKED;
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#endif /* _IGMP_H */
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struct igmptable_t {
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struct in_addr group;
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unsigned long time;
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} PACKED;
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extern void join_group ( int slot, unsigned long group );
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extern void leave_group ( int slot );
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#endif /* IGMP_H */
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#include "ip.h"
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#include "igmp.h"
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#include "background.h"
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#include "nic.h"
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#include "etherboot.h"
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@ -56,7 +57,8 @@ static void send_igmp_reports ( unsigned long now ) {
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}
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}
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static void process_igmp ( struct iphdr *ip, unsigned long now ) {
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static void process_igmp ( unsigned long now, unsigned short ptype __unused,
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struct iphdr *ip ) {
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struct igmp *igmp;
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int i;
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unsigned iplen;
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@ -110,6 +112,11 @@ static void process_igmp ( struct iphdr *ip, unsigned long now ) {
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}
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}
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static struct background igmp_background __background = {
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.send = send_igmp_reports,
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.process = process_igmp,
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};
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void leave_group ( int slot ) {
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/* Be very stupid and always send a leave group message if
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* I have subscribed. Imperfect but it is standards
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@ -157,4 +164,3 @@ void join_group ( int slot, unsigned long group ) {
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igmptable[slot].time = currticks();
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}
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}
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