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Commit 7c9bc378 authored by Niranjan Pendharkar's avatar Niranjan Pendharkar Committed by Giulio Cervera
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core: Add API to retrieve mtu size 

Adding an API to libnetutils to retrieve mtu size of an interface
Made few utility functions from ifc_utils public

Change-Id: Iddec2dcd9f241b146d7f362e2df0724cf740d1f2
(cherry picked from commit 108cded7d96cc347f36b5b78c404c5ebccce13d7)
parent d39f5249

include/netutils/ifc.h

+4 −1
Original line number Diff line number Diff line 
/*

 * Copyright 2008, The Android Open Source Project

 * Copyright (C) 2011, Code Aurora Forum. All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License"); 

 * you may not use this file except in compliance with the License.
@@ -61,10 +62,12 @@ extern int ifc_remove_route(const char *ifname, const char *dst, 
                            int prefix_length, const char *gw);

extern int ifc_get_info(const char *name, in_addr_t *addr, int *prefixLength,

                        unsigned *flags);



extern int ifc_configure(const char *ifname, in_addr_t address,

                         uint32_t prefixLength, in_addr_t gateway,

                         in_addr_t dns1, in_addr_t dns2);

extern int ifc_get_mtu(const char *name, int *mtuSz);

extern in_addr_t prefixLengthToIpv4Netmask(int prefix_length);

extern int ipv4NetmaskToPrefixLength(in_addr_t mask);



__END_DECLS

libnetutils/ifc_utils.c

+19 −0
Original line number Diff line number Diff line 
/*

 * Copyright 2008, The Android Open Source Project

 * Copyright (C) 2011, Code Aurora Forum. All rights reserved.

 *

 * Licensed under the Apache License, Version 2.0 (the "License"); 

 * you may not use this file except in compliance with the License.
@@ -981,3 +982,21 @@ int ifc_remove_route(const char *ifname, const char*dst, int prefix_length, cons 
{

    return ifc_act_on_route(SIOCDELRT, ifname, dst, prefix_length, gw);

}



int ifc_get_mtu(const char *name, int *mtuSz)

{

    struct ifreq ifr;

    ifc_init_ifr(name, &ifr);



    if (mtuSz != NULL) {

        if(ioctl(ifc_ctl_sock, SIOCGIFMTU, &ifr) < 0) {

            *mtuSz = 0;

            return -2;

        } else {

            *mtuSz = ifr.ifr_mtu;

            return 0;

        }

    }



    return -1;

}