git: 1b745d8b23e4 - main - pf: move normalisation into pf_setup_pdesc()
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Date: Tue, 01 Oct 2024 10:12:13 UTC
The branch main has been updated by kp:
URL: https://cgit.FreeBSD.org/src/commit/?id=1b745d8b23e465872e171579cfc944bd57e5501a
commit 1b745d8b23e465872e171579cfc944bd57e5501a
Author: Kristof Provost <kp@FreeBSD.org>
AuthorDate: 2024-09-16 11:58:49 +0000
Commit: Kristof Provost <kp@FreeBSD.org>
CommitDate: 2024-10-01 07:55:14 +0000
pf: move normalisation into pf_setup_pdesc()
This simplifies the code slightly, and brings us closer to the OpenBSD code.
Sponsored by: Rubicon Communications, LLC ("Netgate")
Differential Revision: https://reviews.freebsd.org/D46707
---
sys/netpfil/pf/pf.c | 111 ++++++++++++++++++++++++++++------------------------
1 file changed, 60 insertions(+), 51 deletions(-)
diff --git a/sys/netpfil/pf/pf.c b/sys/netpfil/pf/pf.c
index ccfe1a0fcd96..51b4cebc88e9 100644
--- a/sys/netpfil/pf/pf.c
+++ b/sys/netpfil/pf/pf.c
@@ -8462,12 +8462,16 @@ pf_dummynet_route(struct pf_pdesc *pd, struct pf_kstate *s,
}
static int
-pf_setup_pdesc(sa_family_t af, int dir, struct pf_pdesc *pd, struct mbuf *m,
+pf_setup_pdesc(sa_family_t af, int dir, struct pf_pdesc *pd, struct mbuf **m0,
u_short *action, u_short *reason, struct pfi_kkif *kif, struct pf_krule **a,
struct pf_krule **r, struct pf_kstate **s, struct pf_kruleset **ruleset,
int *off, int *hdrlen, struct inpcb *inp,
struct pf_rule_actions *default_actions)
{
+ struct mbuf *m = *m0;
+
+ memset(pd, 0, sizeof(*pd));
+ pd->dir = dir;
TAILQ_INIT(&pd->sctp_multihome_jobs);
if (default_actions != NULL)
@@ -8486,6 +8490,22 @@ pf_setup_pdesc(sa_family_t af, int dir, struct pf_pdesc *pd, struct mbuf *m,
case AF_INET: {
struct ip *h;
+ if (__predict_false(m->m_len < sizeof(struct ip)) &&
+ (m = *m0 = m_pullup(*m0, sizeof(struct ip))) == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test: m_len < sizeof(struct ip), pullup failed\n"));
+ *action = PF_DROP;
+ REASON_SET(reason, PFRES_SHORT);
+ return (-1);
+ }
+
+ if (pf_normalize_ip(m0, kif, reason, pd) != PF_PASS) {
+ /* We do IP header normalization and packet reassembly here */
+ *action = PF_DROP;
+ return (-1);
+ }
+ m = *m0;
+
h = mtod(m, struct ip *);
*off = h->ip_hl << 2;
if (*off < (int)sizeof(*h)) {
@@ -8533,6 +8553,23 @@ pf_setup_pdesc(sa_family_t af, int dir, struct pf_pdesc *pd, struct mbuf *m,
struct ip6_hdr *h;
int terminal = 0;
+ if (__predict_false(m->m_len < sizeof(struct ip6_hdr)) &&
+ (m = *m0 = m_pullup(*m0, sizeof(struct ip6_hdr))) == NULL) {
+ DPFPRINTF(PF_DEBUG_URGENT,
+ ("pf_test6: m_len < sizeof(struct ip6_hdr)"
+ ", pullup failed\n"));
+ *action = PF_DROP;
+ REASON_SET(reason, PFRES_SHORT);
+ return (-1);
+ }
+
+ /* We do IP header normalization and packet reassembly here */
+ if (pf_normalize_ip6(m0, kif, reason, pd) != PF_PASS) {
+ *action = PF_DROP;
+ return (-1);
+ }
+ m = *m0;
+
h = mtod(m, struct ip6_hdr *);
pd->src = (struct pf_addr *)&h->ip6_src;
pd->dst = (struct pf_addr *)&h->ip6_dst;
@@ -8855,65 +8892,44 @@ pf_test(sa_family_t af, int dir, int pflags, struct ifnet *ifp, struct mbuf **m0
return (PF_PASS);
}
+#ifdef INET6
+ /*
+ * If we end up changing IP addresses (e.g. binat) the stack may get
+ * confused and fail to send the icmp6 packet too big error. Just send
+ * it here, before we do any NAT.
+ */
+ if (af == AF_INET6 && dir == PF_OUT && pflags & PFIL_FWD &&
+ IN6_LINKMTU(ifp) < pf_max_frag_size(m)) {
+ PF_RULES_RUNLOCK();
+ *m0 = NULL;
+ icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, IN6_LINKMTU(ifp));
+ return (PF_DROP);
+ }
+#endif
+
if (__predict_false(! M_WRITABLE(*m0))) {
m = *m0 = m_unshare(*m0, M_NOWAIT);
if (*m0 == NULL)
return (PF_DROP);
}
- memset(&pd, 0, sizeof(pd));
- pd.dir = dir;
+ if (pf_setup_pdesc(af, dir, &pd, m0, &action, &reason, kif, &a, &r,
+ &s, &ruleset, &off, &hdrlen, inp, default_actions) == -1) {
+ if (action != PF_PASS)
+ pd.act.log |= PF_LOG_FORCE;
+ goto done;
+ }
+ m = *m0;
switch (af) {
#ifdef INET
case AF_INET:
- if (__predict_false(m->m_len < sizeof(struct ip)) &&
- (m = *m0 = m_pullup(*m0, sizeof(struct ip))) == NULL) {
- DPFPRINTF(PF_DEBUG_URGENT,
- ("pf_test: m_len < sizeof(struct ip), pullup failed\n"));
- PF_RULES_RUNLOCK();
- return (PF_DROP);
- }
-
- if (pf_normalize_ip(m0, kif, &reason, &pd) != PF_PASS) {
- /* We do IP header normalization and packet reassembly here */
- action = PF_DROP;
- goto done;
- }
- m = *m0; /* pf_normalize messes with m0 */
h = mtod(m, struct ip *);
ttl = h->ip_ttl;
break;
#endif
#ifdef INET6
case AF_INET6:
- /*
- * If we end up changing IP addresses (e.g. binat) the stack may get
- * confused and fail to send the icmp6 packet too big error. Just send
- * it here, before we do any NAT.
- */
- if (dir == PF_OUT && pflags & PFIL_FWD && IN6_LINKMTU(ifp) < pf_max_frag_size(m)) {
- PF_RULES_RUNLOCK();
- *m0 = NULL;
- icmp6_error(m, ICMP6_PACKET_TOO_BIG, 0, IN6_LINKMTU(ifp));
- return (PF_DROP);
- }
-
- if (__predict_false(m->m_len < sizeof(struct ip6_hdr)) &&
- (m = *m0 = m_pullup(*m0, sizeof(struct ip6_hdr))) == NULL) {
- DPFPRINTF(PF_DEBUG_URGENT,
- ("pf_test6: m_len < sizeof(struct ip6_hdr)"
- ", pullup failed\n"));
- PF_RULES_RUNLOCK();
- return (PF_DROP);
- }
-
- /* We do IP header normalization and packet reassembly here */
- if (pf_normalize_ip6(m0, kif, &reason, &pd) != PF_PASS) {
- action = PF_DROP;
- goto done;
- }
- m = *m0; /* pf_normalize messes with m0 */
h6 = mtod(m, struct ip6_hdr *);
ttl = h6->ip6_hlim;
break;
@@ -8922,13 +8938,6 @@ pf_test(sa_family_t af, int dir, int pflags, struct ifnet *ifp, struct mbuf **m0
panic("Unknown af %d", af);
}
- if (pf_setup_pdesc(af, dir, &pd, m, &action, &reason, kif, &a, &r,
- &s, &ruleset, &off, &hdrlen, inp, default_actions) == -1) {
- if (action != PF_PASS)
- pd.act.log |= PF_LOG_FORCE;
- goto done;
- }
-
if (pd.pf_mtag != NULL && (pd.pf_mtag->flags & PF_MTAG_FLAG_ROUTE_TO)) {
pd.pf_mtag->flags &= ~PF_MTAG_FLAG_ROUTE_TO;