Split rt_newaddrmsg_fib() into two different functions.
Adding/deleting interface addresses involves access to 3 different subsystems, int different parts of code. Each call can fail, so reporting successful operation by rtsock in the middle of the process error-prone. Further split routing notification API and actual rtsock calls via creating public-available rt_addrmsg() / rt_routemsg() functions with "private" rtsock_* backend. MFC after: 2 weeks
This commit is contained in:
Alexander V. Chernikov
parent
977929e179
commit
4cbac30b29
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=260488
108
sys/net/route.c
108
sys/net/route.c
@ -37,6 +37,7 @@
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#include "opt_inet.h"
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#include "opt_inet6.h"
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#include "opt_route.h"
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#include "opt_sctp.h"
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#include "opt_mrouting.h"
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#include "opt_mpath.h"
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@ -52,6 +53,7 @@
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#include <sys/proc.h>
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#include <sys/domain.h>
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#include <sys/kernel.h>
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#include <sys/kdb.h>
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#include <net/if.h>
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#include <net/if_var.h>
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@ -86,6 +88,13 @@
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#define RT_NUMFIBS 1
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#endif
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#if defined(INET) || defined(INET6)
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#ifdef SCTP
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extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
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#endif /* SCTP */
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#endif
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/* This is read-only.. */
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u_int rt_numfibs = RT_NUMFIBS;
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SYSCTL_UINT(_net, OID_AUTO, fibs, CTLFLAG_RD, &rt_numfibs, 0, "");
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@ -118,7 +127,8 @@ VNET_DEFINE(int, rttrash); /* routes not in table but not freed */
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/* compare two sockaddr structures */
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#define sa_equal(a1, a2) (bcmp((a1), (a2), (a1)->sa_len) == 0)
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#define sa_equal(a1, a2) (((a1)->sa_len == (a2)->sa_len) && \
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(bcmp((a1), (a2), (a1)->sa_len) == 0))
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/*
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* Convert a 'struct radix_node *' to a 'struct rtentry *'.
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@ -1731,3 +1741,99 @@ rtinit(struct ifaddr *ifa, int cmd, int flags)
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}
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return (rtinit1(ifa, cmd, flags, fib));
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}
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/*
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* Announce interface address arrival/withdraw
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* Returns 0 on success.
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*/
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int
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rt_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
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{
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KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
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("unexpected cmd %u", cmd));
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if (fibnum != RT_ALL_FIBS) {
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KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: "
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"fibnum out of range 0 <= %d < %d", __func__,
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fibnum, rt_numfibs));
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}
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return (rtsock_addrmsg(cmd, ifa, fibnum));
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}
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/*
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* Announce route addition/removal
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* Users of this function MUST validate input data BEFORE calling.
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* However we have to be able to handle invalid data:
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* if some userland app sends us "invalid" route message (invalid mask,
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* no dst, wrokg address families, etc...) we need to pass it back
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* to app (and any other rtsock consumers) with rtm_errno field set to
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* non-zero value.
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* Returns 0 on success.
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*/
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int
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rt_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
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int fibnum)
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{
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KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
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("unexpected cmd %u", cmd));
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if (fibnum != RT_ALL_FIBS) {
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KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: "
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"fibnum out of range 0 <= %d < %d", __func__,
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fibnum, rt_numfibs));
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}
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KASSERT(rt_key(rt) != NULL, (":%s: rt_key must be supplied", __func__));
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return (rtsock_routemsg(cmd, ifp, error, rt, fibnum));
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}
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void
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rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
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{
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rt_newaddrmsg_fib(cmd, ifa, error, rt, RT_ALL_FIBS);
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}
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/*
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* This is called to generate messages from the routing socket
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* indicating a network interface has had addresses associated with it.
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*/
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void
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rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt,
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int fibnum)
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{
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KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
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("unexpected cmd %u", cmd));
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if (fibnum != RT_ALL_FIBS) {
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KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: "
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"fibnum out of range 0 <= %d < %d", __func__,
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fibnum, rt_numfibs));
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}
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#if defined(INET) || defined(INET6)
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#ifdef SCTP
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/*
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* notify the SCTP stack
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* this will only get called when an address is added/deleted
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* XXX pass the ifaddr struct instead if ifa->ifa_addr...
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*/
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sctp_addr_change(ifa, cmd);
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#endif /* SCTP */
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#endif
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if (cmd == RTM_ADD) {
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rt_addrmsg(cmd, ifa, fibnum);
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if (rt != NULL)
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rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum);
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} else {
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if (rt != NULL)
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rt_routemsg(cmd, ifa->ifa_ifp, error, rt, fibnum);
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rt_addrmsg(cmd, ifa, fibnum);
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}
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}
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@ -369,10 +369,15 @@ void rt_missmsg(int, struct rt_addrinfo *, int, int);
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void rt_missmsg_fib(int, struct rt_addrinfo *, int, int, int);
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void rt_newaddrmsg(int, struct ifaddr *, int, struct rtentry *);
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void rt_newaddrmsg_fib(int, struct ifaddr *, int, struct rtentry *, int);
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int rt_addrmsg(int, struct ifaddr *, int);
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int rt_routemsg(int, struct ifnet *ifp, int, struct rtentry *, int);
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void rt_newmaddrmsg(int, struct ifmultiaddr *);
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int rt_setgate(struct rtentry *, struct sockaddr *, struct sockaddr *);
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void rt_maskedcopy(struct sockaddr *, struct sockaddr *, struct sockaddr *);
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int rtsock_addrmsg(int, struct ifaddr *, int);
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int rtsock_routemsg(int, struct ifnet *ifp, int, struct rtentry *, int);
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/*
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* Note the following locking behavior:
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*
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157
sys/net/rtsock.c
157
sys/net/rtsock.c
@ -30,7 +30,6 @@
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* $FreeBSD$
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*/
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#include "opt_compat.h"
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#include "opt_sctp.h"
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#include "opt_mpath.h"
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#include "opt_inet.h"
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#include "opt_inet6.h"
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@ -70,12 +69,6 @@
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#include <netinet6/scope6_var.h>
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#endif
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#if defined(INET) || defined(INET6)
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#ifdef SCTP
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extern void sctp_addr_change(struct ifaddr *ifa, int cmd);
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#endif /* SCTP */
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#endif
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#ifdef COMPAT_FREEBSD32
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#include <sys/mount.h>
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#include <compat/freebsd32/freebsd32.h>
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@ -1334,90 +1327,94 @@ rt_ifmsg(struct ifnet *ifp)
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}
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/*
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* This is called to generate messages from the routing socket
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* indicating a network interface has had addresses associated with it.
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* if we ever reverse the logic and replace messages TO the routing
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* socket indicate a request to configure interfaces, then it will
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* be unnecessary as the routing socket will automatically generate
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* copies of it.
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* Announce interface address arrival/withdraw.
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* Please do not call directly, use rt_addrmsg().
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* Assume input data to be valid.
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* Returns 0 on success.
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*/
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void
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rt_newaddrmsg_fib(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt,
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int
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rtsock_addrmsg(int cmd, struct ifaddr *ifa, int fibnum)
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{
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struct rt_addrinfo info;
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struct sockaddr *sa;
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int ncmd;
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struct mbuf *m;
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struct ifa_msghdr *ifam;
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struct ifnet *ifp = ifa->ifa_ifp;
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if (route_cb.any_count == 0)
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return (0);
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ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
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bzero((caddr_t)&info, sizeof(info));
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info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
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info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
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info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
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info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
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if ((m = rt_msg1(ncmd, &info)) == NULL)
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return (ENOBUFS);
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ifam = mtod(m, struct ifa_msghdr *);
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ifam->ifam_index = ifp->if_index;
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ifam->ifam_metric = ifa->ifa_metric;
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ifam->ifam_flags = ifa->ifa_flags;
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ifam->ifam_addrs = info.rti_addrs;
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if (fibnum != RT_ALL_FIBS) {
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M_SETFIB(m, fibnum);
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m->m_flags |= RTS_FILTER_FIB;
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}
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rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
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return (0);
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}
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/*
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* Announce route addition/removal.
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* Please do not call directly, use rt_routemsg().
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* Note that @rt data MAY be inconsistent/invalid:
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* if some userland app sends us "invalid" route message (invalid mask,
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* no dst, wrong address families, etc...) we need to pass it back
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* to app (and any other rtsock consumers) with rtm_errno field set to
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* non-zero value.
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*
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* Returns 0 on success.
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*/
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int
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rtsock_routemsg(int cmd, struct ifnet *ifp, int error, struct rtentry *rt,
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int fibnum)
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{
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struct rt_addrinfo info;
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struct sockaddr *sa = NULL;
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int pass;
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struct mbuf *m = NULL;
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struct ifnet *ifp = ifa->ifa_ifp;
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struct sockaddr *sa;
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struct mbuf *m;
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struct rt_msghdr *rtm;
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KASSERT(cmd == RTM_ADD || cmd == RTM_DELETE,
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("unexpected cmd %u", cmd));
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#if defined(INET) || defined(INET6)
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#ifdef SCTP
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/*
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* notify the SCTP stack
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* this will only get called when an address is added/deleted
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* XXX pass the ifaddr struct instead if ifa->ifa_addr...
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*/
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sctp_addr_change(ifa, cmd);
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#endif /* SCTP */
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#endif
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if (route_cb.any_count == 0)
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return;
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for (pass = 1; pass < 3; pass++) {
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bzero((caddr_t)&info, sizeof(info));
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if ((cmd == RTM_ADD && pass == 1) ||
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(cmd == RTM_DELETE && pass == 2)) {
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struct ifa_msghdr *ifam;
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int ncmd = cmd == RTM_ADD ? RTM_NEWADDR : RTM_DELADDR;
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return (0);
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info.rti_info[RTAX_IFA] = sa = ifa->ifa_addr;
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info.rti_info[RTAX_IFP] = ifp->if_addr->ifa_addr;
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info.rti_info[RTAX_NETMASK] = ifa->ifa_netmask;
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info.rti_info[RTAX_BRD] = ifa->ifa_dstaddr;
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if ((m = rt_msg1(ncmd, &info)) == NULL)
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continue;
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ifam = mtod(m, struct ifa_msghdr *);
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ifam->ifam_index = ifp->if_index;
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ifam->ifam_metric = ifa->ifa_metric;
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ifam->ifam_flags = ifa->ifa_flags;
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ifam->ifam_addrs = info.rti_addrs;
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}
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if ((cmd == RTM_ADD && pass == 2) ||
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(cmd == RTM_DELETE && pass == 1)) {
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struct rt_msghdr *rtm;
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bzero((caddr_t)&info, sizeof(info));
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info.rti_info[RTAX_NETMASK] = rt_mask(rt);
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info.rti_info[RTAX_DST] = sa = rt_key(rt);
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info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
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if ((m = rt_msg1(cmd, &info)) == NULL)
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return (ENOBUFS);
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rtm = mtod(m, struct rt_msghdr *);
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rtm->rtm_index = ifp->if_index;
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rtm->rtm_flags |= rt->rt_flags;
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rtm->rtm_errno = error;
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rtm->rtm_addrs = info.rti_addrs;
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if (rt == NULL)
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continue;
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info.rti_info[RTAX_NETMASK] = rt_mask(rt);
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info.rti_info[RTAX_DST] = sa = rt_key(rt);
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info.rti_info[RTAX_GATEWAY] = rt->rt_gateway;
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if ((m = rt_msg1(cmd, &info)) == NULL)
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continue;
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rtm = mtod(m, struct rt_msghdr *);
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rtm->rtm_index = ifp->if_index;
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rtm->rtm_flags |= rt->rt_flags;
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rtm->rtm_errno = error;
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rtm->rtm_addrs = info.rti_addrs;
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}
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if (fibnum != RT_ALL_FIBS) {
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KASSERT(fibnum >= 0 && fibnum < rt_numfibs, ("%s: "
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"fibnum out of range 0 <= %d < %d", __func__,
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fibnum, rt_numfibs));
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M_SETFIB(m, fibnum);
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m->m_flags |= RTS_FILTER_FIB;
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}
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rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
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if (fibnum != RT_ALL_FIBS) {
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M_SETFIB(m, fibnum);
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m->m_flags |= RTS_FILTER_FIB;
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}
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rt_dispatch(m, sa ? sa->sa_family : AF_UNSPEC);
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return (0);
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}
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void
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rt_newaddrmsg(int cmd, struct ifaddr *ifa, int error, struct rtentry *rt)
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{
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rt_newaddrmsg_fib(cmd, ifa, error, rt, RT_ALL_FIBS);
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}
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/*
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* This is the analogue to the rt_newaddrmsg which performs the same
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