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util: Make sock_l4() treat empty string ifname like NULL

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sock_l4() takes NULL for ifname if you don't want to bind the socket to a
particular interface.  However, for a number of the callers, it's more
natural to use an empty string for that case.  Change sock_l4() to accept
either NULL or an empty string equivalently, and simplify some callers
using that change.

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 2023-12-08 01:31:40 +11:00 • committed by Stefano Brivio
parent 5cada56186
commit 57de44a4bc
3 changed files with 7 additions and 16 deletions

15
icmp.c
View file

@ -187,12 +187,8 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, int af,
iref.id = id = ntohs(ih->un.echo.id);
if ((s = icmp_id_map[V4][id].sock) <= 0) {
const char *bind_if;
bind_if = *c->ip4.ifname_out ? c->ip4.ifname_out : NULL;
s = sock_l4(c, AF_INET, IPPROTO_ICMP,
&c->ip4.addr_out, bind_if, id, iref.u32);
s = sock_l4(c, AF_INET, IPPROTO_ICMP, &c->ip4.addr_out,
c->ip4.ifname_out, id, iref.u32);
if (s < 0)
goto fail_sock;
if (s > FD_REF_MAX) {
@ -237,12 +233,9 @@ int icmp_tap_handler(const struct ctx *c, uint8_t pif, int af,
iref.id = id = ntohs(ih->icmp6_identifier);
if ((s = icmp_id_map[V6][id].sock) <= 0) {
const char *bind_if;
bind_if = *c->ip6.ifname_out ? c->ip6.ifname_out : NULL;
s = sock_l4(c, AF_INET6, IPPROTO_ICMPV6,
&c->ip6.addr_out, bind_if, id, iref.u32);
&c->ip6.addr_out,
c->ip6.ifname_out, id, iref.u32);
if (s < 0)
goto fail_sock;
if (s > FD_REF_MAX) {