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Convert pf rtable checks to the new routing KPI.

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Switch uRPF to use specific fib(9)-provided uRPF.
Switch MSS calculation to the latest fib(9) kpi.

Reviewed by:	kp
Differential Revision:	https://reviews.freebsd.org/D24386
This commit is contained in:
Alexander V. Chernikov 2020-04-15 13:00:48 +00:00
parent 53a4886d5d
commit 643ce94878
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=359964
1 changed files with 15 additions and 138 deletions
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153
sys/netpfil/pf/pf.c
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@ -69,7 +69,7 @@ __FBSDID("$FreeBSD$");
#include <net/if_types.h>
#include <net/if_vlan_var.h>
#include <net/route.h>
#include <net/radix_mpath.h>
#include <net/route/nhop.h>
#include <net/vnet.h>
#include <net/pfil.h>
@ -3176,31 +3176,32 @@ pf_get_mss(struct mbuf *m, int off, u_int16_t th_off, sa_family_t af)
static u_int16_t
pf_calc_mss(struct pf_addr *addr, sa_family_t af, int rtableid, u_int16_t offer)
{
#ifdef INET
struct nhop4_basic nh4;
#endif /* INET */
struct nhop_object *nh;
#ifdef INET6
struct nhop6_basic nh6;
struct in6_addr dst6;
uint32_t scopeid;
#endif /* INET6 */
int hlen = 0;
uint16_t mss = 0;
NET_EPOCH_ASSERT();
switch (af) {
#ifdef INET
case AF_INET:
hlen = sizeof(struct ip);
if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) == 0)
mss = nh4.nh_mtu - hlen - sizeof(struct tcphdr);
nh = fib4_lookup(rtableid, addr->v4, 0, 0, 0);
if (nh != NULL)
mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
break;
#endif /* INET */
#ifdef INET6
case AF_INET6:
hlen = sizeof(struct ip6_hdr);
in6_splitscope(&addr->v6, &dst6, &scopeid);
if (fib6_lookup_nh_basic(rtableid, &dst6, scopeid, 0,0,&nh6)==0)
mss = nh6.nh_mtu - hlen - sizeof(struct tcphdr);
nh = fib6_lookup(rtableid, &dst6, scopeid, 0, 0);
if (nh != NULL)
mss = nh->nh_mtu - hlen - sizeof(struct tcphdr);
break;
#endif /* INET6 */
}
@ -5338,122 +5339,12 @@ pf_pull_hdr(struct mbuf *m, int off, void *p, int len,
return (p);
}
#ifdef RADIX_MPATH
static int
pf_routable_oldmpath(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
int rtableid)
{
struct radix_node_head *rnh;
struct sockaddr_in *dst;
int ret = 1;
int check_mpath;
#ifdef INET6
struct sockaddr_in6 *dst6;
struct route_in6 ro;
#else
struct route ro;
#endif
struct radix_node *rn;
struct rtentry *rt;
struct ifnet *ifp;
check_mpath = 0;
/* XXX: stick to table 0 for now */
rnh = rt_tables_get_rnh(0, af);
if (rnh != NULL && rn_mpath_capable(rnh))
check_mpath = 1;
bzero(&ro, sizeof(ro));
switch (af) {
case AF_INET:
dst = satosin(&ro.ro_dst);
dst->sin_family = AF_INET;
dst->sin_len = sizeof(*dst);
dst->sin_addr = addr->v4;
break;
#ifdef INET6
case AF_INET6:
/*
* Skip check for addresses with embedded interface scope,
* as they would always match anyway.
*/
if (IN6_IS_SCOPE_EMBED(&addr->v6))
goto out;
dst6 = (struct sockaddr_in6 *)&ro.ro_dst;
dst6->sin6_family = AF_INET6;
dst6->sin6_len = sizeof(*dst6);
dst6->sin6_addr = addr->v6;
break;
#endif /* INET6 */
default:
return (0);
}
/* Skip checks for ipsec interfaces */
if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
goto out;
switch (af) {
#ifdef INET6
case AF_INET6:
in6_rtalloc_ign(&ro, 0, rtableid);
break;
#endif
#ifdef INET
case AF_INET:
in_rtalloc_ign((struct route *)&ro, 0, rtableid);
break;
#endif
}
if (ro.ro_rt != NULL) {
/* No interface given, this is a no-route check */
if (kif == NULL)
goto out;
if (kif->pfik_ifp == NULL) {
ret = 0;
goto out;
}
/* Perform uRPF check if passed input interface */
ret = 0;
rn = (struct radix_node *)ro.ro_rt;
do {
rt = (struct rtentry *)rn;
ifp = rt->rt_ifp;
if (kif->pfik_ifp == ifp)
ret = 1;
rn = rn_mpath_next(rn);
} while (check_mpath == 1 && rn != NULL && ret == 0);
} else
ret = 0;
out:
if (ro.ro_rt != NULL)
RTFREE(ro.ro_rt);
return (ret);
}
#endif
int
pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
int rtableid)
{
#ifdef INET
struct nhop4_basic nh4;
#endif
#ifdef INET6
struct nhop6_basic nh6;
#endif
struct ifnet *ifp;
#ifdef RADIX_MPATH
struct radix_node_head *rnh;
/* XXX: stick to table 0 for now */
rnh = rt_tables_get_rnh(0, af);
if (rnh != NULL && rn_mpath_capable(rnh))
return (pf_routable_oldmpath(addr, af, kif, rtableid));
#endif
/*
* Skip check for addresses with embedded interface scope,
* as they would always match anyway.
@ -5468,35 +5359,21 @@ pf_routable(struct pf_addr *addr, sa_family_t af, struct pfi_kif *kif,
if (kif != NULL && kif->pfik_ifp->if_type == IFT_ENC)
return (1);
ifp = NULL;
ifp = (kif != NULL) ? kif->pfik_ifp : NULL;
switch (af) {
#ifdef INET6
case AF_INET6:
if (fib6_lookup_nh_basic(rtableid, &addr->v6, 0, 0, 0, &nh6)!=0)
return (0);
ifp = nh6.nh_ifp;
break;
return (fib6_check_urpf(rtableid, &addr->v6, 0, NHR_NONE,
ifp));
#endif
#ifdef INET
case AF_INET:
if (fib4_lookup_nh_basic(rtableid, addr->v4, 0, 0, &nh4) != 0)
return (0);
ifp = nh4.nh_ifp;
break;
return (fib4_check_urpf(rtableid, addr->v4, 0, NHR_NONE,
ifp));
#endif
}
/* No interface given, this is a no-route check */
if (kif == NULL)
return (1);
if (kif->pfik_ifp == NULL)
return (0);
/* Perform uRPF check if passed input interface */
if (kif->pfik_ifp == ifp)
return (1);
return (0);
}