pespin has uploaded this change for review.
ggsn: Rename confusing functions
It's really confusing having a function operating on a rx path called
"encaps" since it's not really encapsulating anything.
This confuses the reader by thinking this is the function encapsulating
packets into GTP-U.
Change-Id: I7ff54f5e57ccc2c436becd1be1b0f728cbcdb12c
---
M ggsn/ggsn.c
M sgsnemu/sgsnemu.c
2 files changed, 16 insertions(+), 13 deletions(-)
git pull ssh://gerrit.osmocom.org:29418/osmo-ggsn refs/changes/06/38506/1
diff --git a/ggsn/ggsn.c b/ggsn/ggsn.c
index a02b97f..6b51bbc 100644
--- a/ggsn/ggsn.c
+++ b/ggsn/ggsn.c
@@ -667,7 +667,8 @@
return rc;
}
-/* Internet-originated IP packet, needs to be sent via GTP towards MS */
+/* Rx Internet-originated IP packet from our tun iface, needs to be sent via
+ * GTPU towards MS. */
static int cb_tun_ind(struct tun_t *tun, void *pack, unsigned len)
{
struct apn_ctx *apn = tun->priv;
@@ -747,8 +748,10 @@
return 0;
}
-/* MS-originated GTP1-U packet, needs to be sent via TUN device */
-static int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len)
+/* Rx MS-originated GTP-U packet, needs to be sent via TUN device.
+ * "pack" contains the GTP-U payload once decapsulated from GTP-U by libgtp.
+ * Hence, "pack" should contain an IP packet. */
+static int cb_gtpu_data_ind(struct pdp_t *pdp, void *pack, unsigned len)
{
struct iphdr *iph = (struct iphdr *)pack;
struct ip6_hdr *ip6h = (struct ip6_hdr *)pack;
@@ -963,7 +966,7 @@
rc = osmo_fd_register(&ggsn->gtp_fd1u);
OSMO_ASSERT(rc == 0);
- gtp_set_cb_data_ind(ggsn->gsn, encaps_tun);
+ gtp_set_cb_data_ind(ggsn->gsn, cb_gtpu_data_ind);
gtp_set_cb_create_context_ind(ggsn->gsn, create_context_ind);
gtp_set_cb_update_context_ind(ggsn->gsn, update_context_ind);
gtp_set_cb_delete_context(ggsn->gsn, delete_context);
diff --git a/sgsnemu/sgsnemu.c b/sgsnemu/sgsnemu.c
index 9ab0f25..c592aa9 100644
--- a/sgsnemu/sgsnemu.c
+++ b/sgsnemu/sgsnemu.c
@@ -1196,7 +1196,7 @@
return 0;
}
-static int encaps_ping4(struct pdp_t *pdp, void *pack, unsigned len)
+static int cb_gtpu_data_ind_ping4(struct pdp_t *pdp, void *pack, unsigned len)
{
struct timeval tv;
struct timeval *tp;
@@ -1258,7 +1258,7 @@
return 0;
}
-static int encaps_ping6(struct pdp_t *pdp, struct ip6_hdr *ip6h, unsigned len)
+static int cb_gtpu_data_ind_ping6(struct pdp_t *pdp, struct ip6_hdr *ip6h, unsigned len)
{
const struct icmpv6_echo_hdr *ic6h = (struct icmpv6_echo_hdr *) ((uint8_t*)ip6h + sizeof(*ip6h));
struct timeval tv;
@@ -1325,7 +1325,7 @@
}
/* Handle a received ping packet. Print out line and update statistics. */
-static int encaps_ping(struct pdp_t *pdp, void *pack, unsigned len)
+static int cb_gtpu_data_ind_ping(struct pdp_t *pdp, void *pack, unsigned len)
{
struct iphdr *iph = (struct iphdr *)pack;
struct timeval tv;
@@ -1343,9 +1343,9 @@
}
switch(iph->version) {
case 4:
- return encaps_ping4(pdp, pack, len);
+ return cb_gtpu_data_ind_ping4(pdp, pack, len);
case 6:
- return encaps_ping6(pdp, (struct ip6_hdr *)pack, len);
+ return cb_gtpu_data_ind_ping6(pdp, (struct ip6_hdr *)pack, len);
default:
SYS_ERR(DSGSN, LOGL_ERROR, 0, "Unknown ip header version %d", iph->version);
return -1;
@@ -1812,7 +1812,7 @@
}
}
-static int encaps_tun(struct pdp_t *pdp, void *pack, unsigned len)
+static int cb_gtpu_data_ind(struct pdp_t *pdp, void *pack, unsigned len)
{
struct iphdr *iph = (struct iphdr *)pack;
struct icmpv6_radv_hdr *ra;
@@ -1826,7 +1826,7 @@
break;
}
- /* printf("encaps_tun. Packet received: forwarding to tun\n"); */
+ /* printf("cb_gtpu_data_ind. Packet received: forwarding to tun\n"); */
return tun_encaps((struct tun_t *)pdp->ipif, pack, len);
}
@@ -1883,9 +1883,9 @@
gtp_set_cb_delete_context(gsn, delete_context);
gtp_set_cb_conf(gsn, _gtp_cb_conf);
if (options.createif)
- gtp_set_cb_data_ind(gsn, encaps_tun);
+ gtp_set_cb_data_ind(gsn, cb_gtpu_data_ind);
else
- gtp_set_cb_data_ind(gsn, encaps_ping);
+ gtp_set_cb_data_ind(gsn, cb_gtpu_data_ind_ping);
#if defined(__linux__)
if ((options.createif) && (options.netns)) {
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