1997/0530/ip/gre.c (diff list | history)

1997/0524/sys/src/9/ip/gre.c:11,18 – 1997/0530/sys/src/9/ip/gre.c:11,18 (short | long | prev | next)
1997/0327		enum { GRE_IPHDRSIZE = 20, /* size of ip header */ GRE_HDRSIZE = 4, /* minimum size of GRE header */
1997/0530		GRE_IPONLY = 12, /* size of ip header */ GRE_IPPLUSGRE = 12, /* minimum size of GRE header */
1997/0327		IP_GREPROTO = 47, GRErxms = 200,
1997/0524/sys/src/9/ip/gre.c:122,127 – 1997/0530/sys/src/9/ip/gre.c:122,128
1997/0327		{ GREhdr *ghp;
1997/0524		Block *bp;
1997/0530		ulong raddr, laddr;
1997/0327		USED(l);
1997/0524/sys/src/9/ip/gre.c:130,149 – 1997/0530/sys/src/9/ip/gre.c:131,157
1997/0327		return; /* Make space to fit ip header (gre header already there) */ bp = padblock(bp, GRE_IPHDRSIZE);
1997/0530		bp = padblock(bp, GRE_IPONLY);
1997/0327		if(bp == nil) return; /* make sure the message has a GRE header */ bp = pullupblock(bp, GRE_IPHDRSIZE+GRE_HDRSIZE);
1997/0530		bp = pullupblock(bp, GRE_IPONLY+GRE_IPPLUSGRE);
1997/0327		if(bp == nil) return; ghp = (GREhdr *)(bp->rp);
1997/0530		raddr = nhgetl(ghp->src); laddr = nhgetl(ghp->dst); if(raddr == 0) raddr = c->raddr; if(laddr == 0 || Mediaforme(ghp->dst) <= 0) laddr = c->laddr;
1997/0327		ghp->proto = IP_GREPROTO; hnputl(ghp->dst, c->raddr); hnputl(ghp->src, c->laddr);
1997/0530		hnputl(ghp->dst, raddr); hnputl(ghp->src, laddr);
1997/0327		hnputs(ghp->eproto, c->rport);
1997/0522		ghp->frag[0] = 0; ghp->frag[1] = 0;
1997/0524/sys/src/9/ip/gre.c:184,195 – 1997/0530/sys/src/9/ip/gre.c:192,203
1997/0327		/* * Trim the packet down to data size */ len = nhgets(ghp->len) - GRE_IPHDRSIZE; if(len < GRE_HDRSIZE){
1997/0530		len = nhgets(ghp->len) - GRE_IPONLY; if(len < GRE_IPPLUSGRE){
1997/0327		freeblist(bp); return; } bp = trimblock(bp, GRE_IPHDRSIZE, len);
1997/0530		bp = trimblock(bp, GRE_IPONLY, len);
1997/0327		if(bp == nil){ gre.lenerr++; return;