diff options
Diffstat (limited to 'net/openvswitch/flow_netlink.c')
| -rw-r--r-- | net/openvswitch/flow_netlink.c | 93 |
1 files changed, 72 insertions, 21 deletions
diff --git a/net/openvswitch/flow_netlink.c b/net/openvswitch/flow_netlink.c index 368f233..939bcb3 100644 --- a/net/openvswitch/flow_netlink.c +++ b/net/openvswitch/flow_netlink.c @@ -103,10 +103,19 @@ static void update_range__(struct sw_flow_match *match, SW_FLOW_KEY_MEMCPY_OFFSET(match, offsetof(struct sw_flow_key, field), \ value_p, len, is_mask) -static u16 range_n_bytes(const struct sw_flow_key_range *range) -{ - return range->end - range->start; -} +#define SW_FLOW_KEY_MEMSET_FIELD(match, field, value, is_mask) \ + do { \ + update_range__(match, offsetof(struct sw_flow_key, field), \ + sizeof((match)->key->field), is_mask); \ + if (is_mask) { \ + if ((match)->mask) \ + memset((u8 *)&(match)->mask->key.field, value,\ + sizeof((match)->mask->key.field)); \ + } else { \ + memset((u8 *)&(match)->key->field, value, \ + sizeof((match)->key->field)); \ + } \ + } while (0) static bool match_validate(const struct sw_flow_match *match, u64 key_attrs, u64 mask_attrs) @@ -809,13 +818,26 @@ static int ovs_key_from_nlattrs(struct sw_flow_match *match, u64 attrs, return 0; } -static void sw_flow_mask_set(struct sw_flow_mask *mask, - struct sw_flow_key_range *range, u8 val) +static void nlattr_set(struct nlattr *attr, u8 val, bool is_attr_mask_key) { - u8 *m = (u8 *)&mask->key + range->start; + struct nlattr *nla; + int rem; + + /* The nlattr stream should already have been validated */ + nla_for_each_nested(nla, attr, rem) { + /* We assume that ovs_key_lens[type] == -1 means that type is a + * nested attribute + */ + if (is_attr_mask_key && ovs_key_lens[nla_type(nla)] == -1) + nlattr_set(nla, val, false); + else + memset(nla_data(nla), val, nla_len(nla)); + } +} - mask->range = *range; - memset(m, val, range_n_bytes(range)); +static void mask_set_nlattr(struct nlattr *attr, u8 val) +{ + nlattr_set(attr, val, true); } /** @@ -836,6 +858,7 @@ int ovs_nla_get_match(struct sw_flow_match *match, { const struct nlattr *a[OVS_KEY_ATTR_MAX + 1]; const struct nlattr *encap; + struct nlattr *newmask = NULL; u64 key_attrs = 0; u64 mask_attrs = 0; bool encap_valid = false; @@ -882,18 +905,44 @@ int ovs_nla_get_match(struct sw_flow_match *match, if (err) return err; + if (match->mask && !mask) { + /* Create an exact match mask. We need to set to 0xff all the + * 'match->mask' fields that have been touched in 'match->key'. + * We cannot simply memset 'match->mask', because padding bytes + * and fields not specified in 'match->key' should be left to 0. + * Instead, we use a stream of netlink attributes, copied from + * 'key' and set to 0xff: ovs_key_from_nlattrs() will take care + * of filling 'match->mask' appropriately. + */ + newmask = kmemdup(key, nla_total_size(nla_len(key)), + GFP_KERNEL); + if (!newmask) + return -ENOMEM; + + mask_set_nlattr(newmask, 0xff); + + /* The userspace does not send tunnel attributes that are 0, + * but we should not wildcard them nonetheless. + */ + if (match->key->tun_key.ipv4_dst) + SW_FLOW_KEY_MEMSET_FIELD(match, tun_key, 0xff, true); + + mask = newmask; + } + if (mask) { err = parse_flow_mask_nlattrs(mask, a, &mask_attrs); if (err) - return err; + goto free_newmask; - if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) { + if (mask_attrs & 1 << OVS_KEY_ATTR_ENCAP) { __be16 eth_type = 0; __be16 tci = 0; if (!encap_valid) { OVS_NLERR("Encap mask attribute is set for non-VLAN frame.\n"); - return -EINVAL; + err = -EINVAL; + goto free_newmask; } mask_attrs &= ~(1 << OVS_KEY_ATTR_ENCAP); @@ -904,10 +953,13 @@ int ovs_nla_get_match(struct sw_flow_match *match, mask_attrs &= ~(1 << OVS_KEY_ATTR_ETHERTYPE); encap = a[OVS_KEY_ATTR_ENCAP]; err = parse_flow_mask_nlattrs(encap, a, &mask_attrs); + if (err) + goto free_newmask; } else { OVS_NLERR("VLAN frames must have an exact match on the TPID (mask=%x).\n", ntohs(eth_type)); - return -EINVAL; + err = -EINVAL; + goto free_newmask; } if (a[OVS_KEY_ATTR_VLAN]) @@ -915,23 +967,22 @@ int ovs_nla_get_match(struct sw_flow_match *match, if (!(tci & htons(VLAN_TAG_PRESENT))) { OVS_NLERR("VLAN tag present bit must have an exact match (tci_mask=%x).\n", ntohs(tci)); - return -EINVAL; + err = -EINVAL; + goto free_newmask; } } err = ovs_key_from_nlattrs(match, mask_attrs, a, true); if (err) - return err; - } else { - /* Populate exact match flow's key mask. */ - if (match->mask) - sw_flow_mask_set(match->mask, &match->range, 0xff); + goto free_newmask; } if (!match_validate(match, key_attrs, mask_attrs)) - return -EINVAL; + err = -EINVAL; - return 0; +free_newmask: + kfree(newmask); + return err; } /** |
