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frag6: Reduce code duplication

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The code which removes a fragment queue from the per-VNET hash table was
duplicated three times.  Factor it out into a function.  No functional
change intended.

Reviewed by:	kp, bz
MFC after:	1 week
Differential Revision:	https://reviews.freebsd.org/D43228
This commit is contained in:
Mark Johnston 2023-12-31 11:15:48 -05:00
parent f12a9a4c04
commit 0736a38072
1 changed files with 19 additions and 25 deletions
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44
sys/netinet6/frag6.c
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@ -288,6 +288,20 @@ ip6_deletefraghdr(struct mbuf *m, int offset, int wait __unused)
return (0);
}
static void
frag6_rmqueue(struct ip6q *q6, uint32_t bucket)
{
IP6QB_LOCK_ASSERT(bucket);
TAILQ_REMOVE(IP6QB_HEAD(bucket), q6, ip6q_tq);
V_ip6qb[bucket].count--;
#ifdef MAC
mac_ip6q_destroy(q6);
#endif
free(q6, M_FRAG6);
atomic_subtract_int(&V_frag6_nfragpackets, 1);
}
/*
* Free a fragment reassembly header and all associated datagrams.
*/
@ -324,14 +338,8 @@ frag6_freef(struct ip6q *q6, uint32_t bucket)
free(af6, M_FRAG6);
}
TAILQ_REMOVE(IP6QB_HEAD(bucket), q6, ip6q_tq);
V_ip6qb[bucket].count--;
atomic_subtract_int(&frag6_nfrags, q6->ip6q_nfrag);
#ifdef MAC
mac_ip6q_destroy(q6);
#endif
free(q6, M_FRAG6);
atomic_subtract_int(&V_frag6_nfragpackets, 1);
frag6_rmqueue(q6, bucket);
}
/*
@ -637,15 +645,8 @@ frag6_input(struct mbuf **mp, int *offp, int proto)
if (q6->ip6q_unfrglen >= 0) {
/* The 1st fragment has already arrived. */
if (q6->ip6q_unfrglen + fragoff + frgpartlen > IPV6_MAXPACKET) {
if (only_frag) {
TAILQ_REMOVE(head, q6, ip6q_tq);
V_ip6qb[bucket].count--;
atomic_subtract_int(&V_frag6_nfragpackets, 1);
#ifdef MAC
mac_ip6q_destroy(q6);
#endif
free(q6, M_FRAG6);
}
if (only_frag)
frag6_rmqueue(q6, bucket);
IP6QB_UNLOCK(bucket);
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
offset - sizeof(struct ip6_frag) +
@ -654,15 +655,8 @@ frag6_input(struct mbuf **mp, int *offp, int proto)
return (IPPROTO_DONE);
}
} else if (fragoff + frgpartlen > IPV6_MAXPACKET) {
if (only_frag) {
TAILQ_REMOVE(head, q6, ip6q_tq);
V_ip6qb[bucket].count--;
atomic_subtract_int(&V_frag6_nfragpackets, 1);
#ifdef MAC
mac_ip6q_destroy(q6);
#endif
free(q6, M_FRAG6);
}
if (only_frag)
frag6_rmqueue(q6, bucket);
IP6QB_UNLOCK(bucket);
icmp6_error(m, ICMP6_PARAM_PROB, ICMP6_PARAMPROB_HEADER,
offset - sizeof(struct ip6_frag) +