netlink: improve RTM_GETADDR handling.
* Allow filtering by ifa_family & ifa_index. * Add common RTM_<NEW|DEL|GET>ADDR parser * Add tests verifying RTM_GETADDR filtering behaviour & output * Factor out common netlink socket test methods into NetlinkTestTemplate * Add NLMSG_DONE message handler Reviewed By: pauamma Differential Revision: https://reviews.freebsd.org/D37970
This commit is contained in:
parent
4ffe60e683
commit
c1871a3372
@ -403,14 +403,27 @@ Not supported
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.Ss RTM_DELADDR
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Not supported
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.Ss RTM_GETADDR
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Fetches interface addresses in the current VNET matching conditions.
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Each address is reported as a
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.Dv RTM_NEWADDR
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message.
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The following filters are recognised by the kernel:
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.Pp
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.Bd -literal -offset indent -compact
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ifa_family required family or AF_UNSPEC
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ifa_index matching interface index or 0
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.Ed
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.Ss TLVs
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.Bl -tag -width indent
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.It Dv IFA_ADDRESS
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(binary) masked interface address or destination address for p2p interfaces.
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.It Dv IFA_LOCAL
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(binary) local interface address
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(binary) local interface address.
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Set for IPv4 and p2p addresses.
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.It Dv IFA_LABEL
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(string) interface name.
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.It Dv IFA_BROADCAST
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(binary) broacast interface address
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(binary) broacast interface address.
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.El
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.Ss Groups
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The following groups are defined:
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@ -672,6 +672,36 @@ rtnl_handle_newlink(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *n
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return (modify_link(hdr, &attrs, &bm, nlp, npt));
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}
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struct nl_parsed_ifa {
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uint8_t ifa_family;
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uint8_t ifa_prefixlen;
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uint8_t ifa_scope;
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uint32_t ifa_index;
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uint32_t ifa_flags;
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struct sockaddr *ifa_address;
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struct sockaddr *ifa_local;
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};
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#define _IN(_field) offsetof(struct ifaddrmsg, _field)
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#define _OUT(_field) offsetof(struct nl_parsed_ifa, _field)
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static const struct nlfield_parser nlf_p_ifa[] = {
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{ .off_in = _IN(ifa_family), .off_out = _OUT(ifa_family), .cb = nlf_get_u8 },
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{ .off_in = _IN(ifa_prefixlen), .off_out = _OUT(ifa_prefixlen), .cb = nlf_get_u8 },
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{ .off_in = _IN(ifa_scope), .off_out = _OUT(ifa_scope), .cb = nlf_get_u8 },
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{ .off_in = _IN(ifa_flags), .off_out = _OUT(ifa_flags), .cb = nlf_get_u8_u32 },
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{ .off_in = _IN(ifa_index), .off_out = _OUT(ifa_index), .cb = nlf_get_u32 },
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};
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static const struct nlattr_parser nla_p_ifa[] = {
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{ .type = IFA_ADDRESS, .off = _OUT(ifa_address), .cb = nlattr_get_ip },
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{ .type = IFA_LOCAL, .off = _OUT(ifa_local), .cb = nlattr_get_ip },
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{ .type = IFA_FLAGS, .off = _OUT(ifa_flags), .cb = nlattr_get_uint32 },
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};
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#undef _IN
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#undef _OUT
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NL_DECLARE_PARSER(ifaddrmsg_parser, struct ifaddrmsg, nlf_p_ifa, nla_p_ifa);
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/*
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{ifa_family=AF_INET, ifa_prefixlen=8, ifa_flags=IFA_F_PERMANENT, ifa_scope=RT_SCOPE_HOST, ifa_index=if_nametoindex("lo")},
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@ -826,15 +856,39 @@ dump_iface_addr(struct nl_writer *nw, struct ifnet *ifp, struct ifaddr *ifa,
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}
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static int
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rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
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dump_iface_addrs(struct netlink_walkargs *wa, struct ifnet *ifp)
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{
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struct ifaddr *ifa;
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CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (wa->family != 0 && wa->family != ifa->ifa_addr->sa_family)
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continue;
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if (ifa->ifa_addr->sa_family == AF_LINK)
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continue;
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wa->count++;
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if (!dump_iface_addr(wa->nw, ifp, ifa, &wa->hdr))
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return (ENOMEM);
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wa->dumped++;
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}
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return (0);
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}
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static int
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rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *npt)
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{
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struct ifnet *ifp;
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int error = 0;
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struct nl_parsed_ifa attrs = {};
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error = nl_parse_nlmsg(hdr, &ifaddrmsg_parser, npt, &attrs);
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if (error != 0)
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return (error);
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struct netlink_walkargs wa = {
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.so = nlp,
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.nw = npt->nw,
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.family = attrs.ifa_family,
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.hdr.nlmsg_pid = hdr->nlmsg_pid,
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.hdr.nlmsg_seq = hdr->nlmsg_seq,
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.hdr.nlmsg_flags = hdr->nlmsg_flags | NLM_F_MULTI,
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@ -843,22 +897,19 @@ rtnl_handle_getaddr(struct nlmsghdr *hdr, struct nlpcb *nlp, struct nl_pstate *n
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NL_LOG(LOG_DEBUG2, "Start dump");
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if (attrs.ifa_index != 0) {
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ifp = ifnet_byindex(attrs.ifa_index);
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if (ifp == NULL)
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error = ENOENT;
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else
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error = dump_iface_addrs(&wa, ifp);
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} else {
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CK_STAILQ_FOREACH(ifp, &V_ifnet, if_link) {
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CK_STAILQ_FOREACH(ifa, &ifp->if_addrhead, ifa_link) {
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if (wa.family != 0 && wa.family != ifa->ifa_addr->sa_family)
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continue;
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if (ifa->ifa_addr->sa_family == AF_LINK)
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continue;
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wa.count++;
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if (!dump_iface_addr(wa.nw, ifp, ifa, &wa.hdr)) {
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error = ENOMEM;
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break;
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}
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wa.dumped++;
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}
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error = dump_iface_addrs(&wa, ifp);
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if (error != 0)
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break;
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}
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}
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NL_LOG(LOG_DEBUG2, "End dump, iterated %d dumped %d", wa.count, wa.dumped);
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@ -991,7 +1042,7 @@ static const struct rtnl_cmd_handler cmd_handlers[] = {
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},
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};
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static const struct nlhdr_parser *all_parsers[] = { &ifmsg_parser };
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static const struct nlhdr_parser *all_parsers[] = { &ifmsg_parser, &ifaddrmsg_parser };
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void
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rtnl_iface_add_cloner(struct nl_cloner *cloner)
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@ -52,7 +52,7 @@ enum {
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IFA_UNSPEC,
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IFA_ADDRESS = 1, /* binary, prefix address (destination for p2p) */
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IFA_LOCAL = 2, /* binary, interface address */
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IFA_LABEL = 3, /* not supported */
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IFA_LABEL = 3, /* string, interface name */
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IFA_BROADCAST = 4, /* binary, broadcast ifa */
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IFA_ANYCAST = 5, /* not supported */
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IFA_CACHEINFO = 6, /* not supported */
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@ -49,6 +49,12 @@ class Nlmsghdr(Structure):
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]
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class Nlmsgdone(Structure):
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_fields_ = [
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("error", c_int),
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]
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class Nlmsgerr(Structure):
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_fields_ = [
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("error", c_int),
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@ -961,6 +967,8 @@ def prepare_attrs_map(attrs: List[AttrDescr]) -> Dict[str, Dict]:
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),
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]
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nldone_attrs = []
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nlerr_attrs = [
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_MSG, NlAttrStr),
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AttrDescr(NlErrattrType.NLMSGERR_ATTR_OFFS, NlAttrU32),
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@ -989,6 +997,7 @@ def prepare_attrs_map(attrs: List[AttrDescr]) -> Dict[str, Dict]:
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rtnl_ifa_attrs = [
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AttrDescr(IfattrType.IFA_ADDRESS, NlAttrIp),
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AttrDescr(IfattrType.IFA_LOCAL, NlAttrIp),
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AttrDescr(IfattrType.IFA_LABEL, NlAttrStr),
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AttrDescr(IfattrType.IFA_BROADCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_ANYCAST, NlAttrIp),
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AttrDescr(IfattrType.IFA_FLAGS, NlAttrU32),
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@ -1167,6 +1176,25 @@ def print_message(self):
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nla.print_attr(" ")
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class NetlinkDoneMessage(StdNetlinkMessage):
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messages = [NlMsgType.NLMSG_DONE.value]
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nl_attrs_map = prepare_attrs_map(nldone_attrs)
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@property
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def error_code(self):
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return self.base_hdr.error
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def parse_base_header(self, data):
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if len(data) < sizeof(Nlmsgdone):
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raise ValueError("length less than nlmsgdone header")
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done_hdr = Nlmsgdone.from_buffer_copy(data)
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sz = sizeof(Nlmsgdone)
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return (done_hdr, sz)
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def print_base_header(self, hdr, prepend=""):
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print("{}error={}".format(prepend, hdr.error))
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class NetlinkErrorMessage(StdNetlinkMessage):
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messages = [NlMsgType.NLMSG_ERROR.value]
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nl_attrs_map = prepare_attrs_map(nlerr_attrs)
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@ -1340,6 +1368,7 @@ def build_msgmap(self):
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NetlinkRtMessage,
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NetlinkIflaMessage,
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NetlinkIfaMessage,
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NetlinkDoneMessage,
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NetlinkErrorMessage,
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]
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xmap = {}
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@ -1476,20 +1505,63 @@ def request_families(self):
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self.write_data(msg_bytes)
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def main():
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helper = NlHelper()
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if False:
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nl = Nlsock(NlConst.NETLINK_GENERIC, helper)
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nl.request_families()
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else:
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nl = Nlsock(NlConst.NETLINK_ROUTE, helper)
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# nl.request_ifaddrs(socket.AF_INET)
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# nl.request_raw()
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nl.request_routes(0)
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# nl.request_ifaces()
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while True:
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msg = nl.read_message()
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class NetlinkMultipartIterator(object):
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def __init__(self, obj, seq_number: int, msg_type):
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self._obj = obj
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self._seq = seq_number
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self._msg_type = msg_type
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def __iter__(self):
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return self
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def __next__(self):
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msg = self._obj.read_message()
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if self._seq != msg.nl_hdr.nlmsg_seq:
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raise ValueError("bad sequence number")
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if msg.is_type(NlMsgType.NLMSG_ERROR):
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raise ValueError(
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"error while handling multipart msg: {}".format(msg.error_code)
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)
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elif msg.is_type(NlMsgType.NLMSG_DONE):
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if msg.error_code == 0:
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raise StopIteration
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raise ValueError(
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"error listing some parts of the multipart msg: {}".format(
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msg.error_code
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)
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)
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elif not msg.is_type(self._msg_type):
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raise ValueError("bad message type: {}".format(msg))
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return msg
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class NetlinkTestTemplate(object):
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REQUIRED_MODULES = ["netlink"]
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def setup_netlink(self, netlink_family: NlConst):
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self.helper = NlHelper()
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self.nlsock = Nlsock(netlink_family, self.helper)
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def write_message(self, msg):
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print("")
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print("============= >> TX MESSAGE =============")
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msg.print_message()
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msg.print_as_bytes(msg._orig_data, "-- DATA --")
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pass
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self.nlsock.write_data(bytes(msg))
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msg.print_as_bytes(bytes(msg), "-- DATA --")
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def read_message(self):
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msg = self.nlsock.read_message()
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print("")
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print("============= << RX MESSAGE =============")
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msg.print_message()
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return msg
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def get_reply(self, tx_msg):
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self.write_message(tx_msg)
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while True:
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rx_msg = self.read_message()
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if tx_msg.nl_hdr.nlmsg_seq == rx_msg.nl_hdr.nlmsg_seq:
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return rx_msg
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def read_msg_list(self, seq, msg_type):
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return list(NetlinkMultipartIterator(self, seq, msg_type))
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@ -7,6 +7,7 @@ TESTSDIR= ${TESTSBASE}/sys/netlink
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ATF_TESTS_C += test_snl
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ATF_TESTS_PYTEST += test_rtnl_iface.py
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ATF_TESTS_PYTEST += test_rtnl_ifaddr.py
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CFLAGS+= -I${.CURDIR:H:H:H}
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@ -6,49 +6,24 @@
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from atf_python.sys.net.netlink import IflinkInfo
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from atf_python.sys.net.netlink import IfLinkInfoDataVlan
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from atf_python.sys.net.netlink import NetlinkIflaMessage
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from atf_python.sys.net.netlink import NetlinkTestTemplate
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from atf_python.sys.net.netlink import NlAttrNested
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from atf_python.sys.net.netlink import NlAttrStr
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from atf_python.sys.net.netlink import NlAttrStrn
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from atf_python.sys.net.netlink import NlAttrU16
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from atf_python.sys.net.netlink import NlAttrU32
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from atf_python.sys.net.netlink import NlConst
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from atf_python.sys.net.netlink import NlHelper
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from atf_python.sys.net.netlink import NlmBaseFlags
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from atf_python.sys.net.netlink import NlmNewFlags
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from atf_python.sys.net.netlink import NlMsgType
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from atf_python.sys.net.netlink import NlRtMsgType
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from atf_python.sys.net.netlink import Nlsock
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from atf_python.sys.net.vnet import SingleVnetTestTemplate
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class TestRtNlIface(SingleVnetTestTemplate):
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REQUIRED_MODULES = ["netlink"]
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class TestRtNlIface(SingleVnetTestTemplate, NetlinkTestTemplate):
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def setup_method(self, method):
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super().setup_method(method)
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self.helper = NlHelper()
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self.nlsock = Nlsock(NlConst.NETLINK_ROUTE, self.helper)
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def write_message(self, msg):
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print("")
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print("============= >> TX MESSAGE =============")
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msg.print_message()
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self.nlsock.write_data(bytes(msg))
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msg.print_as_bytes(bytes(msg), "-- DATA --")
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def read_message(self):
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msg = self.nlsock.read_message()
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print("")
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print("============= << RX MESSAGE =============")
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msg.print_message()
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return msg
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def get_reply(self, tx_msg):
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self.write_message(tx_msg)
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while True:
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rx_msg = self.read_message()
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if tx_msg.nl_hdr.nlmsg_seq == rx_msg.nl_hdr.nlmsg_seq:
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return rx_msg
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self.setup_netlink(NlConst.NETLINK_ROUTE)
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def get_interface_byname(self, ifname):
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msg = NetlinkIflaMessage(self.helper, NlRtMsgType.RTM_GETLINK.value)
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@ -236,13 +211,11 @@ def test_delete_iface(self):
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# *
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# * {len=76, type=RTM_NEWLINK, flags=NLM_F_REQUEST|NLM_F_ACK|NLM_F_EXCL|NLM_F_CREATE, seq=1662892737, pid=0},
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# * {ifi_family=AF_UNSPEC, ifi_type=ARPHRD_NETROM, ifi_index=0, ifi_flags=0, ifi_change=0},
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# * [
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# * {{nla_len=8, nla_type=IFLA_LINK}, 2},
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# * {{nla_len=12, nla_type=IFLA_IFNAME}, "xvlan22"},
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# * {{nla_len=24, nla_type=IFLA_LINKINFO},
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# * [
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# * {{nla_len=8, nla_type=IFLA_INFO_KIND}, "vlan"...},
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# * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}]}]}, iov_len=76}], msg_iovlen=1, msg_controllen=0, msg_flags=0}, 0) = 76
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# * {{nla_len=12, nla_type=IFLA_INFO_DATA}, "\x06\x00\x01\x00\x16\x00\x00\x00"}
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# */
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@pytest.mark.skip(reason="vlan support needs more work")
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@pytest.mark.require_user("root")
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144
tests/sys/netlink/test_rtnl_ifaddr.py
Normal file
144
tests/sys/netlink/test_rtnl_ifaddr.py
Normal file
@ -0,0 +1,144 @@
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import ipaddress
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import socket
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import struct
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from atf_python.sys.net.netlink import IfattrType
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from atf_python.sys.net.netlink import NetlinkIfaMessage
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from atf_python.sys.net.netlink import NetlinkTestTemplate
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from atf_python.sys.net.netlink import NlConst
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from atf_python.sys.net.netlink import NlHelper
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from atf_python.sys.net.netlink import NlmBaseFlags
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from atf_python.sys.net.netlink import NlMsgType
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from atf_python.sys.net.netlink import NlRtMsgType
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from atf_python.sys.net.netlink import Nlsock
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from atf_python.sys.net.netlink import RtScope
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from atf_python.sys.net.vnet import SingleVnetTestTemplate
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class TestRtNlIfaddr(SingleVnetTestTemplate, NetlinkTestTemplate):
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def setup_method(self, method):
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method_name = method.__name__
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if "4" in method_name:
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self.IPV4_PREFIXES = ["192.0.2.1/24"]
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if "6" in method_name:
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self.IPV6_PREFIXES = ["2001:db8::1/64"]
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super().setup_method(method)
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self.setup_netlink(NlConst.NETLINK_ROUTE)
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def test_46_nofilter(self):
|
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"""Tests that listing outputs both IPv4/IPv6 and interfaces"""
|
||||
msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETADDR.value)
|
||||
msg.nl_hdr.nlmsg_flags = (
|
||||
NlmBaseFlags.NLM_F_ACK.value | NlmBaseFlags.NLM_F_REQUEST.value
|
||||
)
|
||||
self.write_message(msg)
|
||||
|
||||
ret = []
|
||||
for rx_msg in self.read_msg_list(msg.nl_hdr.nlmsg_seq, NlRtMsgType.RTM_NEWADDR):
|
||||
ifname = socket.if_indextoname(rx_msg.base_hdr.ifa_index)
|
||||
family = rx_msg.base_hdr.ifa_family
|
||||
ret.append((ifname, family, rx_msg))
|
||||
|
||||
ifname = "lo0"
|
||||
assert len([r for r in ret if r[0] == ifname]) > 0
|
||||
|
||||
ifname = self.vnet.iface_alias_map["if1"].name
|
||||
assert len([r for r in ret if r[0] == ifname and r[1] == socket.AF_INET]) == 1
|
||||
assert len([r for r in ret if r[0] == ifname and r[1] == socket.AF_INET6]) == 2
|
||||
|
||||
def test_46_filter_iface(self):
|
||||
"""Tests that listing outputs both IPv4/IPv6 for the specific interface"""
|
||||
epair_ifname = self.vnet.iface_alias_map["if1"].name
|
||||
|
||||
msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETADDR.value)
|
||||
msg.nl_hdr.nlmsg_flags = (
|
||||
NlmBaseFlags.NLM_F_ACK.value | NlmBaseFlags.NLM_F_REQUEST.value
|
||||
)
|
||||
msg.base_hdr.ifa_index = socket.if_nametoindex(epair_ifname)
|
||||
self.write_message(msg)
|
||||
|
||||
ret = []
|
||||
for rx_msg in self.read_msg_list(msg.nl_hdr.nlmsg_seq, NlRtMsgType.RTM_NEWADDR):
|
||||
ifname = socket.if_indextoname(rx_msg.base_hdr.ifa_index)
|
||||
family = rx_msg.base_hdr.ifa_family
|
||||
ret.append((ifname, family, rx_msg))
|
||||
|
||||
ifname = epair_ifname
|
||||
assert len([r for r in ret if r[0] == ifname and r[1] == socket.AF_INET]) == 1
|
||||
assert len([r for r in ret if r[0] == ifname and r[1] == socket.AF_INET6]) == 2
|
||||
assert len(ret) == 3
|
||||
|
||||
def filter_iface_family(self, family, num_items):
|
||||
"""Tests that listing outputs IPv4 for the specific interface"""
|
||||
epair_ifname = self.vnet.iface_alias_map["if1"].name
|
||||
|
||||
msg = NetlinkIfaMessage(self.helper, NlRtMsgType.RTM_GETADDR.value)
|
||||
msg.nl_hdr.nlmsg_flags = (
|
||||
NlmBaseFlags.NLM_F_ACK.value | NlmBaseFlags.NLM_F_REQUEST.value
|
||||
)
|
||||
msg.base_hdr.ifa_family = family
|
||||
msg.base_hdr.ifa_index = socket.if_nametoindex(epair_ifname)
|
||||
self.write_message(msg)
|
||||
|
||||
ret = []
|
||||
for rx_msg in self.read_msg_list(msg.nl_hdr.nlmsg_seq, NlRtMsgType.RTM_NEWADDR):
|
||||
assert family == rx_msg.base_hdr.ifa_family
|
||||
assert epair_ifname == socket.if_indextoname(rx_msg.base_hdr.ifa_index)
|
||||
ret.append(rx_msg)
|
||||
assert len(ret) == num_items
|
||||
return ret
|
||||
|
||||
def test_4_broadcast(self):
|
||||
"""Tests header/attr output for listing IPv4 ifas on broadcast iface"""
|
||||
ret = self.filter_iface_family(socket.AF_INET, 1)
|
||||
# Should be 192.0.2.1/24
|
||||
msg = ret[0]
|
||||
# Family and ifindex has been checked already
|
||||
assert msg.base_hdr.ifa_prefixlen == 24
|
||||
# Ignore IFA_FLAGS for now
|
||||
assert msg.base_hdr.ifa_scope == RtScope.RT_SCOPE_UNIVERSE.value
|
||||
|
||||
assert msg.get_nla(IfattrType.IFA_ADDRESS).addr == "192.0.2.1"
|
||||
assert msg.get_nla(IfattrType.IFA_LOCAL).addr == "192.0.2.1"
|
||||
assert msg.get_nla(IfattrType.IFA_BROADCAST).addr == "192.0.2.255"
|
||||
|
||||
epair_ifname = self.vnet.iface_alias_map["if1"].name
|
||||
assert msg.get_nla(IfattrType.IFA_LABEL).text == epair_ifname
|
||||
|
||||
def test_6_broadcast(self):
|
||||
"""Tests header/attr output for listing IPv6 ifas on broadcast iface"""
|
||||
ret = self.filter_iface_family(socket.AF_INET6, 2)
|
||||
# Should be 192.0.2.1/24
|
||||
if ret[0].base_hdr.ifa_scope == RtScope.RT_SCOPE_UNIVERSE.value:
|
||||
(gmsg, lmsg) = ret
|
||||
else:
|
||||
(lmsg, gmsg) = ret
|
||||
# Start with global ( 2001:db8::1/64 )
|
||||
msg = gmsg
|
||||
# Family and ifindex has been checked already
|
||||
assert msg.base_hdr.ifa_prefixlen == 64
|
||||
# Ignore IFA_FLAGS for now
|
||||
assert msg.base_hdr.ifa_scope == RtScope.RT_SCOPE_UNIVERSE.value
|
||||
|
||||
assert msg.get_nla(IfattrType.IFA_ADDRESS).addr == "2001:db8::1"
|
||||
assert msg.get_nla(IfattrType.IFA_LOCAL) is None
|
||||
assert msg.get_nla(IfattrType.IFA_BROADCAST) is None
|
||||
|
||||
epair_ifname = self.vnet.iface_alias_map["if1"].name
|
||||
assert msg.get_nla(IfattrType.IFA_LABEL).text == epair_ifname
|
||||
|
||||
# Local: fe80::/64
|
||||
msg = lmsg
|
||||
assert msg.base_hdr.ifa_prefixlen == 64
|
||||
# Ignore IFA_FLAGS for now
|
||||
assert msg.base_hdr.ifa_scope == RtScope.RT_SCOPE_LINK.value
|
||||
|
||||
addr = ipaddress.ip_address(msg.get_nla(IfattrType.IFA_ADDRESS).addr)
|
||||
assert addr.is_link_local
|
||||
# Verify that ifindex is not emmbedded
|
||||
assert struct.unpack("!H", addr.packed[2:4])[0] == 0
|
||||
assert msg.get_nla(IfattrType.IFA_LOCAL) is None
|
||||
assert msg.get_nla(IfattrType.IFA_BROADCAST) is None
|
||||
|
||||
epair_ifname = self.vnet.iface_alias_map["if1"].name
|
||||
assert msg.get_nla(IfattrType.IFA_LABEL).text == epair_ifname
|
Loading…
Reference in New Issue
Block a user