IGMP protocol now uses the generic background protocol mechanism.
[gpxe.git] / src / core / nic.c
index 5b857fd..ebe69e8 100644 (file)
@@ -21,13 +21,10 @@ Literature dealing with the network protocols:
 #include "resolv.h"
 #include "dev.h"
 #include "nic.h"
+#include "background.h"
 #include "elf.h" /* FOR EM_CURRENT */
 
 struct arptable_t      arptable[MAX_ARP];
-#if MULTICAST_LEVEL2
-unsigned long last_igmpv1 = 0;
-struct igmptable_t     igmptable[MAX_IGMP];
-#endif
 /* Put rom_info in .nocompress section so romprefix.S can write to it */
 struct rom_info        rom __attribute__ ((section (".text16.nocompress"))) = {0,0};
 static unsigned long   netmask;
@@ -827,140 +824,6 @@ uint16_t tcpudpchksum(struct iphdr *ip)
        return checksum;
 }
 
-#ifdef MULTICAST_LEVEL2
-static void send_igmp_reports(unsigned long now)
-{
-       int i;
-       for(i = 0; i < MAX_IGMP; i++) {
-               if (igmptable[i].time && (now >= igmptable[i].time)) {
-                       struct igmp_ip_t igmp;
-                       igmp.router_alert[0] = 0x94;
-                       igmp.router_alert[1] = 0x04;
-                       igmp.router_alert[2] = 0;
-                       igmp.router_alert[3] = 0;
-                       build_ip_hdr(igmptable[i].group.s_addr, 
-                               1, IP_IGMP, sizeof(igmp.router_alert), sizeof(igmp), &igmp);
-                       igmp.igmp.type = IGMPv2_REPORT;
-                       if (last_igmpv1 && 
-                               (now < last_igmpv1 + IGMPv1_ROUTER_PRESENT_TIMEOUT)) {
-                               igmp.igmp.type = IGMPv1_REPORT;
-                       }
-                       igmp.igmp.response_time = 0;
-                       igmp.igmp.chksum = 0;
-                       igmp.igmp.group.s_addr = igmptable[i].group.s_addr;
-                       igmp.igmp.chksum = ipchksum(&igmp.igmp, sizeof(igmp.igmp));
-                       ip_transmit(sizeof(igmp), &igmp);
-#ifdef MDEBUG
-                       printf("Sent IGMP report to: %@\n", igmp.igmp.group.s_addr);
-#endif
-                       /* Don't send another igmp report until asked */
-                       igmptable[i].time = 0;
-               }
-       }
-}
-
-static void process_igmp(struct iphdr *ip, unsigned long now)
-{
-       struct igmp *igmp;
-       int i;
-       unsigned iplen;
-       if (!ip || (ip->protocol == IP_IGMP) ||
-               (nic.packetlen < sizeof(struct iphdr) + sizeof(struct igmp))) {
-               return;
-       }
-       iplen = (ip->verhdrlen & 0xf)*4;
-       igmp = (struct igmp *)&nic.packet[sizeof(struct iphdr)];
-       if (ipchksum(igmp, ntohs(ip->len) - iplen) != 0)
-               return;
-       if ((igmp->type == IGMP_QUERY) && 
-               (ip->dest.s_addr == htonl(GROUP_ALL_HOSTS))) {
-               unsigned long interval = IGMP_INTERVAL;
-               if (igmp->response_time == 0) {
-                       last_igmpv1 = now;
-               } else {
-                       interval = (igmp->response_time * TICKS_PER_SEC)/10;
-               }
-               
-#ifdef MDEBUG
-               printf("Received IGMP query for: %@\n", igmp->group.s_addr);
-#endif                        
-               for(i = 0; i < MAX_IGMP; i++) {
-                       uint32_t group = igmptable[i].group.s_addr;
-                       if ((group == 0) || (group == igmp->group.s_addr)) {
-                               unsigned long time;
-                               time = currticks() + rfc1112_sleep_interval(interval, 0);
-                               if (time < igmptable[i].time) {
-                                       igmptable[i].time = time;
-                               }
-                       }
-               }
-       }
-       if (((igmp->type == IGMPv1_REPORT) || (igmp->type == IGMPv2_REPORT)) &&
-               (ip->dest.s_addr == igmp->group.s_addr)) {
-#ifdef MDEBUG
-               printf("Received IGMP report for: %@\n", igmp->group.s_addr);
-#endif                        
-               for(i = 0; i < MAX_IGMP; i++) {
-                       if ((igmptable[i].group.s_addr == igmp->group.s_addr) &&
-                               igmptable[i].time != 0) {
-                               igmptable[i].time = 0;
-                       }
-               }
-       }
-}
-
-void leave_group(int slot)
-{
-       /* Be very stupid and always send a leave group message if 
-        * I have subscribed.  Imperfect but it is standards
-        * compliant, easy and reliable to implement.
-        *
-        * The optimal group leave method is to only send leave when,
-        * we were the last host to respond to a query on this group,
-        * and igmpv1 compatibility is not enabled.
-        */
-       if (igmptable[slot].group.s_addr) {
-               struct igmp_ip_t igmp;
-               igmp.router_alert[0] = 0x94;
-               igmp.router_alert[1] = 0x04;
-               igmp.router_alert[2] = 0;
-               igmp.router_alert[3] = 0;
-               build_ip_hdr(htonl(GROUP_ALL_HOSTS),
-                       1, IP_IGMP, sizeof(igmp.router_alert), sizeof(igmp), &igmp);
-               igmp.igmp.type = IGMP_LEAVE;
-               igmp.igmp.response_time = 0;
-               igmp.igmp.chksum = 0;
-               igmp.igmp.group.s_addr = igmptable[slot].group.s_addr;
-               igmp.igmp.chksum = ipchksum(&igmp.igmp, sizeof(igmp));
-               ip_transmit(sizeof(igmp), &igmp);
-#ifdef MDEBUG
-               printf("Sent IGMP leave for: %@\n", igmp.igmp.group.s_addr);
-#endif 
-       }
-       memset(&igmptable[slot], 0, sizeof(igmptable[0]));
-}
-
-void join_group(int slot, unsigned long group)
-{
-       /* I have already joined */
-       if (igmptable[slot].group.s_addr == group)
-               return;
-       if (igmptable[slot].group.s_addr) {
-               leave_group(slot);
-       }
-       /* Only join a group if we are given a multicast ip, this way
-        * code can be given a non-multicast (broadcast or unicast ip)
-        * and still work... 
-        */
-       if ((group & htonl(MULTICAST_MASK)) == htonl(MULTICAST_NETWORK)) {
-               igmptable[slot].group.s_addr = group;
-               igmptable[slot].time = currticks();
-       }
-}
-#else
-#define send_igmp_reports(now) do {} while(0)
-#define process_igmp(ip, now)  do {} while(0)
-#endif
 
 #include "proto_eth_slow.c"
 
@@ -985,8 +848,8 @@ int await_reply(reply_t reply, int ival, void *ptr, long timeout)
         */
        for (;;) {
                now = currticks();
+               background_send(now);
                send_eth_slow_reports(now);
-               send_igmp_reports(now);
                result = eth_poll(1);
                if (result == 0) {
                        /* We don't have anything */
@@ -1104,8 +967,8 @@ int await_reply(reply_t reply, int ival, void *ptr, long timeout)
 #endif /* MDEBUG */
                        }
                }
+               background_process(now, ptype, ip);
                process_eth_slow(ptype, now);
-               process_igmp(ip, now);
        }
        return(0);
 }
@@ -1297,20 +1160,4 @@ long rfc2131_sleep_interval(long base, int exp)
        return tmo;
 }
 
-#ifdef MULTICAST_LEVEL2
-/**************************************************************************
-RFC1112_SLEEP_INTERVAL - sleep for expotentially longer times, up to (base << exp)
-**************************************************************************/
-long rfc1112_sleep_interval(long base, int exp)
-{
-       unsigned long divisor, tmo;
-#ifdef BACKOFF_LIMIT
-       if (exp > BACKOFF_LIMIT)
-               exp = BACKOFF_LIMIT;
-#endif
-       divisor = RAND_MAX/(base << exp);
-       tmo = random()/divisor;
-       return tmo;
-}
-#endif /* MULTICAST_LEVEL_2 */