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libpfctl: handle the 'pfctl' netlink family not being supported

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If we fail to find the pfctl family we should not attempt to make the
call. That means that either pf is not loaded, or it's a very old (i.e.
pre-netlink) version.

Reported by: manu
Sponsored by:	Rubicon Communications, LLC ("Netgate")
This commit is contained in:
Kristof Provost 2023-11-06 11:57:35 +01:00
parent bce728719e
commit 497ccc21ef
1 changed files with 10 additions and 0 deletions
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10
lib/libpfctl/libpfctl.c
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@ -189,6 +189,8 @@ pfctl_startstop(int start)
snl_init(&ss, NETLINK_GENERIC);
family_id = snl_get_genl_family(&ss, PFNL_FAMILY_NAME);
if (family_id == 0)
return (ENOTSUP);
snl_init_writer(&ss, &nw);
hdr = snl_create_genl_msg_request(&nw, family_id,
@ -1077,6 +1079,8 @@ pfctl_add_rule(int dev __unused, const struct pfctl_rule *r, const char *anchor,
snl_init(&ss, NETLINK_GENERIC);
family_id = snl_get_genl_family(&ss, PFNL_FAMILY_NAME);
if (family_id == 0)
return (ENOTSUP);
snl_init_writer(&ss, &nw);
hdr = snl_create_genl_msg_request(&nw, family_id, PFNL_CMD_ADDRULE);
@ -1213,6 +1217,9 @@ pfctl_get_creators_nl(struct snl_state *ss, uint32_t *creators, size_t *len)
struct nlmsghdr *hdr;
struct snl_writer nw;
if (family_id == 0)
return (ENOTSUP);
snl_init_writer(ss, &nw);
hdr = snl_create_genl_msg_request(&nw, family_id, PFNL_CMD_GETCREATORS);
hdr->nlmsg_flags |= NLM_F_DUMP;
@ -1363,6 +1370,9 @@ pfctl_get_states_nl(struct pfctl_state_filter *filter, struct snl_state *ss, pfc
struct nlmsghdr *hdr;
struct snl_writer nw;
if (family_id == 0)
return (ENOTSUP);
snl_init_writer(ss, &nw);
hdr = snl_create_genl_msg_request(&nw, family_id, PFNL_CMD_GETSTATES);
hdr->nlmsg_flags |= NLM_F_DUMP;