X-Git-Url: https://pintos-os.org/cgi-bin/gitweb.cgi?a=blobdiff_plain;f=lib%2Fnetdev-linux.c;h=736b588a8a11638555e83a047960402f20ac8755;hb=d3f82921586b4018b45fdd1cbfa5c94fc37d362c;hp=e27299a281897c5652bb5ad6ed78945316c65904;hpb=8ab4016b3604566d221b5461f690fd698494e6ae;p=openvswitch

diff --git a/lib/netdev-linux.c b/lib/netdev-linux.c
index e27299a2..736b588a 100644
--- a/lib/netdev-linux.c
+++ b/lib/netdev-linux.c
@@ -128,6 +128,7 @@ struct gre_config {
     bool have_out_key;
     bool in_csum;
     bool out_csum;
+    bool pmtud;
 };
 
 static struct {
@@ -257,7 +258,6 @@ setup_gre_netlink(const char *name OVS_UNUSED,
     struct nlattr *info_data_hdr;
     uint16_t iflags = 0;
     uint16_t oflags = 0;
-    uint8_t pmtudisc = 0;
 
     VLOG_DBG("%s: attempting to create gre device using netlink", name);
 
@@ -316,7 +316,7 @@ setup_gre_netlink(const char *name OVS_UNUSED,
     nl_msg_put_u16(&request, IFLA_GRE_OFLAGS, oflags);
     nl_msg_put_u32(&request, IFLA_GRE_LOCAL, config->local_ip);
     nl_msg_put_u32(&request, IFLA_GRE_REMOTE, config->remote_ip);
-    nl_msg_put_u8(&request, IFLA_GRE_PMTUDISC, pmtudisc);
+    nl_msg_put_u8(&request, IFLA_GRE_PMTUDISC, config->pmtud);
     nl_msg_put_u8(&request, IFLA_GRE_TTL, IPDEFTTL);
     nl_msg_put_u8(&request, IFLA_GRE_TOS, config->tos);
 
@@ -376,6 +376,10 @@ setup_gre_ioctl(const char *name, struct gre_config *config, bool create)
         p.o_flags |= GRE_CSUM;
     }
 
+    if (config->pmtud) {
+        p.iph.frag_off = htons(IP_DONT_FRAGMENT);
+    }
+
     strncpy(ifr.ifr_name, create ? GRE_IOCTL_DEVICE : name, IFNAMSIZ);
     ifr.ifr_ifru.ifru_data = (void *)&p;
 
@@ -489,6 +493,7 @@ setup_gre(const char *name, const struct shash *args, bool create)
     memset(&config, 0, sizeof config);
     config.in_csum = true;
     config.out_csum = true;
+    config.pmtud = true;
 
     SHASH_FOR_EACH (node, args) {
         if (!strcmp(node->name, "remote_ip")) {
@@ -521,6 +526,10 @@ setup_gre(const char *name, const struct shash *args, bool create)
                 config.in_csum = false;
                 config.out_csum = false;
             }
+        } else if (!strcmp(node->name, "pmtud")) {
+            if (!strcmp(node->data, "false")) {
+                config.pmtud = false;
+            }
         } else {
             VLOG_WARN("unknown gre argument '%s'", node->name);
         }