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pf: apply the network stack's ICMP rate limiting to ICMP errors sent by pf

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PR:		266477
Event:		Aberdeen Hackathon 2022
Differential Revision:	https://reviews.freebsd.org/D36903
This commit is contained in:
Kristof Provost 2022-10-07 16:22:57 +02:00
parent 12b92f3ed8
commit a974702e27
3 changed files with 28 additions and 2 deletions
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1
sys/netinet/icmp6.h
View File

@ -708,6 +708,7 @@ int icmp6_input(struct mbuf **, int *, int);
void icmp6_prepare(struct mbuf *);
void icmp6_redirect_input(struct mbuf *, int);
void icmp6_redirect_output(struct mbuf *, struct nhop_object *);
int icmp6_ratelimit(const struct in6_addr *, const int, const int);
struct ip6ctlparam;
void icmp6_mtudisc_update(struct ip6ctlparam *, int);

3
sys/netinet6/icmp6.c
View File

@ -137,7 +137,6 @@ VNET_DECLARE(int, icmp6_nodeinfo);
static void icmp6_errcount(int, int);
static int icmp6_rip6_input(struct mbuf **, int);
static void icmp6_reflect(struct mbuf *, size_t);
static int icmp6_ratelimit(const struct in6_addr *, const int, const int);
static const char *icmp6_redirect_diag(struct in6_addr *,
struct in6_addr *, struct in6_addr *);
static struct mbuf *ni6_input(struct mbuf *, int, struct prison *);
@ -2727,7 +2726,7 @@ icmp6_ctloutput(struct socket *so, struct sockopt *sopt)
* type - not used at this moment
* code - not used at this moment
*/
static int
int
icmp6_ratelimit(const struct in6_addr *dst, const int type,
const int code)
{

26
sys/netpfil/pf/pf.c
View File

@ -3048,6 +3048,22 @@ pf_match_ieee8021q_pcp(u_int8_t prio, struct mbuf *m)
return (mpcp == prio);
}
static int
pf_icmp_to_bandlim(uint8_t type)
{
switch (type) {
case ICMP_ECHO:
case ICMP_ECHOREPLY:
return (BANDLIM_ICMP_ECHO);
case ICMP_TSTAMP:
case ICMP_TSTAMPREPLY:
return (BANDLIM_ICMP_TSTAMP);
case ICMP_UNREACH:
default:
return (BANDLIM_ICMP_UNREACH);
}
}
static void
pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
struct pf_krule *r)
@ -3056,6 +3072,16 @@ pf_send_icmp(struct mbuf *m, u_int8_t type, u_int8_t code, sa_family_t af,
struct mbuf *m0;
struct pf_mtag *pf_mtag;
/* ICMP packet rate limitation. */
if (af == AF_INET6) {
if (icmp6_ratelimit(NULL, type, code))
return;
} else {
MPASS(af == AF_INET);
if (badport_bandlim(pf_icmp_to_bandlim(type)) != 0)
return;
}
/* Allocate outgoing queue entry, mbuf and mbuf tag. */
pfse = malloc(sizeof(*pfse), M_PFTEMP, M_NOWAIT);
if (pfse == NULL)