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Set Dont-Fragment for various os
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parent
cd9c6bbb82
commit
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@ -130,6 +130,10 @@ open_dns(int localport, in_addr_t listen_ip)
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setsockopt(fd, IPPROTO_IP, DSTADDR_SOCKOPT, (const void*) &flag, sizeof(flag));
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#endif
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/* Set dont-fragment ip header flag */
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flag = DONT_FRAG_VALUE;
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setsockopt(fd, IPPROTO_IP, IP_OPT_DONT_FRAG, (const void*) &flag, sizeof(flag));
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if(bind(fd, (struct sockaddr*)&addr, sizeof(addr)) < 0)
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err(1, "bind");
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15
src/common.h
15
src/common.h
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@ -19,7 +19,6 @@
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#ifdef WINDOWS32
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#include "windows.h"
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#include <winsock.h>
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#else
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#include <sys/socket.h>
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#include <err.h>
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@ -45,6 +44,20 @@
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# define dstaddr(x) (&(((struct in_pktinfo *)(CMSG_DATA(x)))->ipi_addr))
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#endif
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#if defined IP_MTUDISC
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# define IP_OPT_DONT_FRAG IP_MTUDISC
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# define DONT_FRAG_VALUE 1
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#elif defined IP_MTU_DISCOVER
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# define IP_OPT_DONT_FRAG IP_MTU_DISCOVER
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# define DONT_FRAG_VALUE IP_PMTUDISC_DO
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#elif defined IP_DONTFRAG
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# define IP_OPT_DONT_FRAG IP_DONTFRAG
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# define DONT_FRAG_VALUE 1
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#elif defined IP_DONTFRAGMENT
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# define IP_OPT_DONT_FRAG IP_DONTFRAGMENT
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# define DONT_FRAG_VALUE 1
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#endif
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struct packet
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{
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int len; /* Total packet length */
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