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netlink: automatically fill sin6_scope_id in the default snl(3) parsers.

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Add the optional post-parse hook to the snl(3) parser declaration.
Use this hook to automatically add the interface indexes to the
 link-local sockaddrs.

MFC after:	2 weeks
This commit is contained in:
Alexander V. Chernikov 2023-05-09 14:55:47 +00:00
parent ba9c815d30
commit 88bd9ef618
2 changed files with 76 additions and 9 deletions
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12
sys/netlink/netlink_snl.h
View file

@ -146,23 +146,30 @@ struct snl_attr_parser {
};
};
typedef bool snl_parse_post_f(struct snl_state *ss, void *target);
struct snl_hdr_parser {
int hdr_off; /* aligned header size */
int fp_size;
int np_size;
const struct snl_field_parser *fp; /* array of header field parsers */
const struct snl_attr_parser *np; /* array of attribute parsers */
snl_parse_post_f *cb_post; /* post-parse callback */
};
#define SNL_DECLARE_PARSER(_name, _t, _fp, _np) \
#define SNL_DECLARE_PARSER_EXT(_name, _t, _fp, _np, _cb) \
static const struct snl_hdr_parser _name = { \
.hdr_off = sizeof(_t), \
.fp = &((_fp)[0]), \
.np = &((_np)[0]), \
.fp_size = NL_ARRAY_LEN(_fp), \
.np_size = NL_ARRAY_LEN(_np), \
.cb_post = _cb, \
}
#define SNL_DECLARE_PARSER(_name, _t, _fp, _np) \
SNL_DECLARE_PARSER_EXT(_name, _t, _fp, _np, NULL)
#define SNL_DECLARE_ATTR_PARSER(_name, _np) \
static const struct snl_hdr_parser _name = { \
.np = &((_np)[0]), \
@ -471,6 +478,9 @@ snl_parse_header(struct snl_state *ss, void *hdr, int len,
bool result = snl_parse_attrs_raw(ss, nla_head, len - parser->hdr_off,
parser->np, parser->np_size, target);
if (result && parser->cb_post != NULL)
result = parser->cb_post(ss, target);
return (result);
}

73
sys/netlink/netlink_snl_route_parsers.h
View file

@ -33,6 +33,17 @@
/* TODO: this file should be generated automatically */
static inline void
finalize_sockaddr(struct sockaddr *sa, uint32_t ifindex)
{
if (sa != NULL && sa->sa_family == AF_INET6) {
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)sa;
if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr))
sin6->sin6_scope_id = ifindex;
}
}
/* RTM_<NEW|DEL|GET>ROUTE message parser */
struct rta_mpath_nh {
@ -63,9 +74,18 @@ static const struct snl_field_parser _fp_p_mp_nh[] = {
{ .off_in = _IN(rtnh_hops), .off_out = _OUT(rtnh_weight), .cb = snl_field_get_uint8 },
{ .off_in = _IN(rtnh_ifindex), .off_out = _OUT(ifindex), .cb = snl_field_get_uint32 },
};
static inline bool
_cb_p_mp_nh(struct snl_state *ss, void *_target)
{
struct rta_mpath_nh *target = _target;
finalize_sockaddr(target->gw, target->ifindex);
return (true);
}
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(_mpath_nh_parser, struct rtnexthop, _fp_p_mp_nh, _nla_p_mp_nh);
SNL_DECLARE_PARSER_EXT(_mpath_nh_parser, struct rtnexthop, _fp_p_mp_nh, _nla_p_mp_nh, _cb_p_mp_nh);
struct rta_mpath {
int num_nhops;
@ -153,9 +173,19 @@ static const struct snl_field_parser _fp_p_route[] = {
{.off_in = _IN(rtm_protocol), .off_out = _OUT(rtm_protocol), .cb = snl_field_get_uint8 },
{.off_in = _IN(rtm_dst_len), .off_out = _OUT(rtm_dst_len), .cb = snl_field_get_uint8 },
};
static inline bool
_cb_p_route(struct snl_state *ss, void *_target)
{
struct snl_parsed_route *target = _target;
finalize_sockaddr(target->rta_dst, target->rta_oif);
finalize_sockaddr(target->rta_gw, target->rta_oif);
return (true);
}
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(snl_rtm_route_parser, struct rtmsg, _fp_p_route, _nla_p_route);
SNL_DECLARE_PARSER_EXT(snl_rtm_route_parser, struct rtmsg, _fp_p_route, _nla_p_route, _cb_p_route);
/* RTM_<NEW|DEL|GET>LINK message parser */
struct snl_parsed_link {
@ -251,9 +281,18 @@ static struct snl_field_parser _fp_p_neigh_s[] = {
{.off_in = _IN(ndm_state), .off_out = _OUT(ndm_state), .cb = snl_field_get_uint16 },
{.off_in = _IN(ndm_ifindex), .off_out = _OUT(nda_ifindex), .cb = snl_field_get_uint32 },
};
static inline bool
_cb_p_neigh(struct snl_state *ss, void *_target)
{
struct snl_parsed_neigh *target = _target;
finalize_sockaddr(target->nda_dst, target->nda_ifindex);
return (true);
}
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(snl_rtm_neigh_parser, struct ndmsg, _fp_p_neigh_s, _nla_p_neigh_s);
SNL_DECLARE_PARSER_EXT(snl_rtm_neigh_parser, struct ndmsg, _fp_p_neigh_s, _nla_p_neigh_s, _cb_p_neigh);
struct snl_parsed_addr {
uint8_t ifa_family;
@ -267,21 +306,30 @@ struct snl_parsed_addr {
#define _IN(_field) offsetof(struct ifaddrmsg, _field)
#define _OUT(_field) offsetof(struct snl_parsed_addr, _field)
static struct snl_attr_parser _nla_p_addr_s[] = {
static const struct snl_attr_parser _nla_p_addr_s[] = {
{ .type = IFA_ADDRESS, .off = _OUT(ifa_address), .cb = snl_attr_get_ip },
{ .type = IFA_LOCAL, .off = _OUT(ifa_local), .cb = snl_attr_get_ip },
{ .type = IFA_LABEL, .off = _OUT(ifa_label), .cb = snl_attr_dup_string },
{ .type = IFA_BROADCAST, .off = _OUT(ifa_broadcast), .cb = snl_attr_get_ip },
};
static struct snl_field_parser _fp_p_addr_s[] = {
static const struct snl_field_parser _fp_p_addr_s[] = {
{.off_in = _IN(ifa_family), .off_out = _OUT(ifa_family), .cb = snl_field_get_uint8 },
{.off_in = _IN(ifa_prefixlen), .off_out = _OUT(ifa_prefixlen), .cb = snl_field_get_uint8 },
{.off_in = _IN(ifa_index), .off_out = _OUT(ifa_index), .cb = snl_field_get_uint32 },
};
static inline bool
_cb_p_addr(struct snl_state *ss, void *_target)
{
struct snl_parsed_addr *target = _target;
finalize_sockaddr(target->ifa_address, target->ifa_index);
finalize_sockaddr(target->ifa_local, target->ifa_index);
return (true);
}
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(snl_rtm_addr_parser, struct ifaddrmsg, _fp_p_addr_s, _nla_p_addr_s);
SNL_DECLARE_PARSER_EXT(snl_rtm_addr_parser, struct ifaddrmsg, _fp_p_addr_s, _nla_p_addr_s, _cb_p_addr);
struct snl_parsed_nhop {
uint32_t nha_id;
@ -320,9 +368,18 @@ static const struct snl_attr_parser _nla_p_nh[] = {
{ .type = NHA_GATEWAY, .off = _OUT(nha_gw), .cb = snl_attr_get_ip },
{ .type = NHA_FREEBSD, .arg = &_nh_fbsd_parser, .cb = snl_attr_get_nested },
};
static inline bool
_cb_p_nh(struct snl_state *ss, void *_target)
{
struct snl_parsed_nhop *target = _target;
finalize_sockaddr(target->nha_gw, target->nha_oif);
return (true);
}
#undef _IN
#undef _OUT
SNL_DECLARE_PARSER(snl_nhmsg_parser, struct nhmsg, _fp_p_nh, _nla_p_nh);
SNL_DECLARE_PARSER_EXT(snl_nhmsg_parser, struct nhmsg, _fp_p_nh, _nla_p_nh, _cb_p_nh);
static const struct snl_hdr_parser *snl_all_route_parsers[] = {
&_metrics_mp_nh_parser, &_mpath_nh_parser, &_metrics_parser, &snl_rtm_route_parser,