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Provide new KPI for network drivers to access lists of interface

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addresses.  The KPI doesn't reveal neither how addresses are stored,
how the access to them is synchronized, neither reveal struct ifaddr
and struct ifmaddr.

Reviewed by:	gallatin, erj, hselasky, philip, stevek
Differential Revision:	https://reviews.freebsd.org/D21943
This commit is contained in:
Gleb Smirnoff 2019-10-10 23:42:55 +00:00
parent 515013704d
commit 826857c833
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=353419
2 changed files with 60 additions and 2 deletions
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49
sys/net/if.c
View File

@ -4263,6 +4263,55 @@ if_getmtu_family(if_t ifp, int family)
return (((struct ifnet *)ifp)->if_mtu);
}
/*
* Methods for drivers to access interface unicast and multicast
* link level addresses. Driver shall not know 'struct ifaddr' neither
* 'struct ifmultiaddr'.
*/
u_int
if_foreach_lladdr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
{
struct epoch_tracker et;
struct ifaddr *ifa;
u_int count;
MPASS(cb);
count = 0;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
if (ifa->ifa_addr->sa_family != AF_LINK)
continue;
count += (*cb)(cb_arg, (struct sockaddr_dl *)ifa->ifa_addr,
count);
}
NET_EPOCH_EXIT(et);
return (count);
}
u_int
if_foreach_llmaddr(if_t ifp, iflladdr_cb_t cb, void *cb_arg)
{
struct epoch_tracker et;
struct ifmultiaddr *ifma;
u_int count;
MPASS(cb);
count = 0;
NET_EPOCH_ENTER(et);
CK_STAILQ_FOREACH(ifma, &ifp->if_multiaddrs, ifma_link) {
if (ifma->ifma_addr->sa_family != AF_LINK)
continue;
count += (*cb)(cb_arg, (struct sockaddr_dl *)ifma->ifma_addr,
count);
}
NET_EPOCH_EXIT(et);
return (count);
}
int
if_setsoftc(if_t ifp, void *softc)
{

13
sys/net/if_var.h
View File

@ -765,11 +765,20 @@ void if_bpfmtap(if_t ifp, struct mbuf *m);
void if_etherbpfmtap(if_t ifp, struct mbuf *m);
void if_vlancap(if_t ifp);
int if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max);
int if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max);
/*
* Traversing through interface address lists.
*/
struct sockaddr_dl;
typedef u_int iflladdr_cb_t(void *, struct sockaddr_dl *, u_int);
u_int if_foreach_lladdr(if_t, iflladdr_cb_t, void *);
u_int if_foreach_llmaddr(if_t, iflladdr_cb_t, void *);
int if_multiaddr_count(if_t ifp, int max);
/* Obsoleted multicast management functions. */
int if_setupmultiaddr(if_t ifp, void *mta, int *cnt, int max);
int if_multiaddr_array(if_t ifp, void *mta, int *cnt, int max);
int if_multi_apply(struct ifnet *ifp, int (*filter)(void *, struct ifmultiaddr *, int), void *arg);
int if_getamcount(if_t ifp);
struct ifaddr * if_getifaddr(if_t ifp);