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adjust comment in previous commit after Julian's explanation

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This commit is contained in:
Luigi Rizzo 2009-12-05 11:51:32 +00:00
parent 00f0143052
commit f573a0a634
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=200118
1 changed files with 9 additions and 8 deletions
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17
sys/netinet/ipfw/ip_fw2.c
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@ -4924,15 +4924,16 @@ vnet_ipfw_init(const void *unused)
/*
* Hook the sockopt handler, and the layer2 (V_ip_fw_chk_ptr)
* and pfil hooks for ipv4 and ipv6. Even if the latter two fail
* we still keep the module alive. ipfw[6]_hook return
* either 0 or ENOENT in case of failure, so we can ignore the
* exact return value and just set a flag.
* we still keep the module alive because the sockopt and
* layer2 paths are still useful.
* ipfw[6]_hook return 0 on success, ENOENT on failure,
* so we can ignore the exact return value and just set a flag.
*
* XXX 20091204 note that V_ether_ipfw is checked on each packet,
* whereas V_fw_enable is only checked at vnet load time.
* This must be fixed so that they act in the same way
* (probably hooking the pfil unconditionally, and bypassing
* the processing if V_fw_enable=0). Same for V_fw6_enable
* Note that V_fw[6]_enable are manipulated by a SYSCTL_PROC so
* changes in the underlying (per-vnet) variables trigger
* immediate hook()/unhook() calls.
* In layer2 we have the same behaviour, except that V_ether_ipfw
* is checked on each packet because there are no pfil hooks.
*/
V_ip_fw_ctl_ptr = ipfw_ctl;
V_ip_fw_chk_ptr = ipfw_chk;