?? udpsend.c
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/* udpsend.c - udpsend */#include <conf.h>#include <kernel.h>#include <network.h>#include <igmp.h>/*------------------------------------------------------------------------ * udpsend - send one UDP datagram to a given IP address *------------------------------------------------------------------------ */intudpsend(IPaddr fip, u_short fport, u_short lport, struct ep *pep, unsigned datalen, Bool docksum){ struct ip *pip = (struct ip *) pep->ep_data; struct udp *pudp = (struct udp *) pip->ip_data; struct route *prt; struct hg *phg; int ttl = IP_TTL; pudp->u_src = lport; pudp->u_dst = fport; pudp->u_len = U_HLEN+datalen; pudp->u_cksum = 0; udph2net(pudp); pep->ep_order &= ~EPO_UDP; if (docksum) { prt = rtget(fip, RTF_LOCAL); if (prt == NULL) { IpOutNoRoutes++; freebuf(pep); return SYSERR; } pip->ip_dst = fip; if (prt->rt_ifnum == NI_LOCAL) pip->ip_src = pip->ip_dst; else pip->ip_src = nif[prt->rt_ifnum].ni_ip; rtfree(prt); pudp->u_cksum = udpcksum(pep, U_HLEN+datalen); if (pudp->u_cksum == 0) pudp->u_cksum = ~0; } UdpOutDatagrams++; if (IP_CLASSD(fip)) { wait(HostGroup.hi_mutex); phg = hglookup(NI_PRIMARY, fip); if (phg) ttl = phg->hg_ttl; else ttl = 1; signal(HostGroup.hi_mutex); } return ipsend(fip, pep, U_HLEN+datalen, IPT_UDP, IPP_NORMAL, ttl);}?? 快捷鍵說明
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