Do not adjust interface MTU automatically. Leave this task to the system
administrator. This restores the behavior that was prior to r274246. No objection from: #network MFC after: 2 weeks Differential Revision: https://reviews.freebsd.org/D10215
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6627d919de
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@ -88,7 +88,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/in_cksum.h>
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#include <security/mac/mac_framework.h>
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#define GREMTU 1500
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#define GREMTU 1476
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static const char grename[] = "gre";
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static MALLOC_DEFINE(M_GRE, grename, "Generic Routing Encapsulation");
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static VNET_DEFINE(struct mtx, gre_mtx);
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@ -173,7 +173,7 @@ gre_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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GRE2IFP(sc)->if_softc = sc;
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if_initname(GRE2IFP(sc), grename, unit);
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GRE2IFP(sc)->if_mtu = sc->gre_mtu = GREMTU;
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GRE2IFP(sc)->if_mtu = GREMTU;
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GRE2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
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GRE2IFP(sc)->if_output = gre_output;
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GRE2IFP(sc)->if_ioctl = gre_ioctl;
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@ -231,7 +231,8 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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/* XXX: */
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if (ifr->ifr_mtu < 576)
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return (EINVAL);
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break;
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ifp->if_mtu = ifr->ifr_mtu;
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return (0);
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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case SIOCSIFFLAGS:
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@ -255,12 +256,6 @@ gre_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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}
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error = 0;
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switch (cmd) {
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case SIOCSIFMTU:
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GRE_WLOCK(sc);
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sc->gre_mtu = ifr->ifr_mtu;
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gre_updatehdr(sc);
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GRE_WUNLOCK(sc);
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goto end;
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case SIOCSIFPHYADDR:
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#ifdef INET6
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case SIOCSIFPHYADDR_IN6:
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@ -549,7 +544,6 @@ gre_updatehdr(struct gre_softc *sc)
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} else
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sc->gre_oseq = 0;
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gh->gre_flags = htons(flags);
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GRE2IFP(sc)->if_mtu = sc->gre_mtu - sc->gre_hlen;
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}
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static void
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@ -69,7 +69,6 @@ struct gre_softc {
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uint32_t gre_oseq;
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uint32_t gre_key;
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uint32_t gre_options;
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uint32_t gre_mtu;
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u_int gre_fibnum;
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u_int gre_hlen; /* header size */
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union {
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@ -66,7 +66,7 @@ __FBSDID("$FreeBSD$");
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#include <machine/in_cksum.h>
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#include <security/mac/mac_framework.h>
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#define MEMTU 1500
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#define MEMTU (1500 - sizeof(struct mobhdr))
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static const char mename[] = "me";
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static MALLOC_DEFINE(M_IFME, mename, "Minimal Encapsulation for IP");
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static VNET_DEFINE(struct mtx, me_mtx);
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@ -186,7 +186,7 @@ me_clone_create(struct if_clone *ifc, int unit, caddr_t params)
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ME2IFP(sc)->if_softc = sc;
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if_initname(ME2IFP(sc), mename, unit);
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ME2IFP(sc)->if_mtu = MEMTU - sizeof(struct mobhdr);
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ME2IFP(sc)->if_mtu = MEMTU;;
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ME2IFP(sc)->if_flags = IFF_POINTOPOINT|IFF_MULTICAST;
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ME2IFP(sc)->if_output = me_output;
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ME2IFP(sc)->if_ioctl = me_ioctl;
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@ -236,7 +236,7 @@ me_ioctl(struct ifnet *ifp, u_long cmd, caddr_t data)
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case SIOCSIFMTU:
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if (ifr->ifr_mtu < 576)
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return (EINVAL);
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ifp->if_mtu = ifr->ifr_mtu - sizeof(struct mobhdr);
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ifp->if_mtu = ifr->ifr_mtu;
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return (0);
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case SIOCSIFADDR:
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ifp->if_flags |= IFF_UP;
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