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tcp: Simplify away tcp_port_rebind()

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tcp_port_rebind() is desgined to be called from NS_CALL() and has two
disjoint cases: one where it enters the namespace (outbound forwards) and
one where it doesn't (inbound forwards).

We only actually need the NS_CALL() framing for the outbound case, for
inbound we can just call tcp_port_do_rebind() directly.  So simplify
tcp_port_rebind() to tcp_port_rebind_outbound(), allowing us to eliminate
an awkward parameters structure.

With that done we can safely rename tcp_port_do_rebind() to
tcp_port_rebind() for brevity.

Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: Stefano Brivio <sbrivio@redhat.com>
This commit is contained in:
David Gibson 2023-11-15 16:25:33 +11:00 committed by Stefano Brivio
parent 1776e7af9b
commit 4ccdeecb74
1 changed files with 12 additions and 29 deletions
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41
tcp.c
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@ -3151,13 +3151,13 @@ int tcp_init(struct ctx *c)
}
/**
* tcp_port_do_rebind() - Rebind ports to match forward maps
* tcp_port_rebind() - Rebind ports to match forward maps
* @c: Execution context
* @outbound: True to remap outbound forwards, otherwise inbound
*
* Must be called in namespace context if @outbound is true.
*/
static void tcp_port_do_rebind(struct ctx *c, bool outbound)
static void tcp_port_rebind(struct ctx *c, bool outbound)
{
const uint8_t *fmap = outbound ? c->tcp.fwd_out.map : c->tcp.fwd_in.map;
const uint8_t *rmap = outbound ? c->tcp.fwd_in.map : c->tcp.fwd_out.map;
@ -3194,32 +3194,19 @@ static void tcp_port_do_rebind(struct ctx *c, bool outbound)
}
/**
* struct tcp_port_rebind_arg - Arguments for tcp_port_rebind()
* @c: Execution context
* @bind_in_ns: Rebind ports in namespace, not in init
*/
struct tcp_port_rebind_arg {
struct ctx *c;
int bind_in_ns;
};
/**
* tcp_port_rebind() - Rebind ports in namespace or init
* @arg: See struct tcp_port_rebind_arg
* tcp_port_rebind_outbound() - Rebind ports in namespace
* @arg: Execution context
*
* Called with NS_CALL()
*
* Return: 0
*/
static int tcp_port_rebind(void *arg)
static int tcp_port_rebind_outbound(void *arg)
{
struct tcp_port_rebind_arg *a = (struct tcp_port_rebind_arg *)arg;
struct ctx *c = (struct ctx *)arg;
if (a->bind_in_ns) {
ns_enter(a->c);
tcp_port_do_rebind(a->c, true);
} else {
tcp_port_do_rebind(a->c, false);
}
ns_enter(c);
tcp_port_rebind(c, true);
return 0;
}
@ -3236,18 +3223,14 @@ void tcp_timer(struct ctx *c, const struct timespec *ts)
(void)ts;
if (c->mode == MODE_PASTA) {
struct tcp_port_rebind_arg rebind_arg = { c, 0 };
if (c->tcp.fwd_out.mode == FWD_AUTO) {
port_fwd_scan_tcp(&c->tcp.fwd_out, &c->tcp.fwd_in);
rebind_arg.bind_in_ns = 1;
NS_CALL(tcp_port_rebind, &rebind_arg);
NS_CALL(tcp_port_rebind_outbound, c);
}
if (c->tcp.fwd_in.mode == FWD_AUTO) {
port_fwd_scan_tcp(&c->tcp.fwd_in, &c->tcp.fwd_out);
rebind_arg.bind_in_ns = 0;
tcp_port_rebind(&rebind_arg);
tcp_port_rebind(c, false);
}
}