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bpf: only access refcounts using dedicated primitives

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Sponsored by:	Rubicon Communications, LLC ("Netgate")
This commit is contained in:
Mateusz Guzik 2022-11-24 10:33:37 +00:00
parent 91db848212
commit 8288117a61
1 changed files with 4 additions and 3 deletions
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7
sys/net/bpf.c
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@ -973,7 +973,7 @@ bpfopen(struct cdev *dev, int flags, int fmt, struct thread *td)
d->bd_bufmode = BPF_BUFMODE_BUFFER;
d->bd_sig = SIGIO;
d->bd_direction = BPF_D_INOUT;
d->bd_refcnt = 1;
refcount_init(&d->bd_refcnt, 1);
BPF_PID_REFRESH(d, td);
#ifdef MAC
mac_bpfdesc_init(d);
@ -2776,7 +2776,7 @@ bpfattach2(struct ifnet *ifp, u_int dlt, u_int hdrlen,
bp->bif_dlt = dlt;
bp->bif_hdrlen = hdrlen;
bp->bif_bpf = driverp;
bp->bif_refcnt = 1;
refcount_init(&bp->bif_refcnt, 1);
*driverp = bp;
/*
* Reference ifnet pointer, so it won't freed until
@ -3146,6 +3146,7 @@ bpf_show_bpf_if(struct bpf_if *bpf_if)
return;
db_printf("%p:\n", bpf_if);
#define BPF_DB_PRINTF(f, e) db_printf(" %s = " f "\n", #e, bpf_if->e);
#define BPF_DB_PRINTF_RAW(f, e) db_printf(" %s = " f "\n", #e, e);
/* bif_ext.bif_next */
/* bif_ext.bif_dlist */
BPF_DB_PRINTF("%#x", bif_dlt);
@ -3153,7 +3154,7 @@ bpf_show_bpf_if(struct bpf_if *bpf_if)
/* bif_wlist */
BPF_DB_PRINTF("%p", bif_ifp);
BPF_DB_PRINTF("%p", bif_bpf);
BPF_DB_PRINTF("%u", bif_refcnt);
BPF_DB_PRINTF_RAW("%u", refcount_load(&bpf_if->bif_refcnt));
}
DB_SHOW_COMMAND(bpf_if, db_show_bpf_if)