diff --git a/sys/netlink/netlink_snl.h b/sys/netlink/netlink_snl.h index 3c63e3f95419..19b3e2f985f3 100644 --- a/sys/netlink/netlink_snl.h +++ b/sys/netlink/netlink_snl.h @@ -1,514 +1,838 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2022 Alexander V. Chernikov * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _NETLINK_NETLINK_SNL_H_ #define _NETLINK_NETLINK_SNL_H_ /* * Simple Netlink Library */ #include #include #include #include #include #include #include #include #include #include #include #define _roundup2(x, y) (((x)+((y)-1))&(~((y)-1))) #define NETLINK_ALIGN_SIZE sizeof(uint32_t) #define NETLINK_ALIGN(_len) _roundup2(_len, NETLINK_ALIGN_SIZE) #define NLA_ALIGN_SIZE sizeof(uint32_t) #define NLA_HDRLEN ((int)sizeof(struct nlattr)) #define NLA_DATA_LEN(_nla) ((int)((_nla)->nla_len - NLA_HDRLEN)) #define NLA_DATA(_nla) NL_ITEM_DATA(_nla, NLA_HDRLEN) #define NLA_DATA_CONST(_nla) NL_ITEM_DATA_CONST(_nla, NLA_HDRLEN) #define NLA_TYPE(_nla) ((_nla)->nla_type & 0x3FFF) #define NLA_NEXT(_attr) (struct nlattr *)(void *)((char *)_attr + NLA_ALIGN(_attr->nla_len)) #define _NLA_END(_start, _len) ((char *)(_start) + (_len)) #define NLA_FOREACH(_attr, _start, _len) \ for (_attr = (_start); \ ((char *)_attr < _NLA_END(_start, _len)) && \ ((char *)NLA_NEXT(_attr) <= _NLA_END(_start, _len)); \ _attr = NLA_NEXT(_attr)) #define NL_ARRAY_LEN(_a) (sizeof(_a) / sizeof((_a)[0])) struct linear_buffer { char *base; /* Base allocated memory pointer */ uint32_t offset; /* Currently used offset */ uint32_t size; /* Total buffer size */ struct linear_buffer *next; /* Buffer chaining */ }; static inline struct linear_buffer * lb_init(uint32_t size) { struct linear_buffer *lb = calloc(1, size); if (lb != NULL) { lb->base = (char *)(lb + 1); lb->size = size - sizeof(*lb); } return (lb); } static inline void lb_free(struct linear_buffer *lb) { free(lb); } static inline char * lb_allocz(struct linear_buffer *lb, int len) { len = roundup2(len, sizeof(uint64_t)); if (lb->offset + len > lb->size) return (NULL); void *data = (void *)(lb->base + lb->offset); lb->offset += len; return (data); } static inline void lb_clear(struct linear_buffer *lb) { memset(lb->base, 0, lb->offset); lb->offset = 0; } struct snl_state { int fd; char *buf; size_t off; size_t bufsize; size_t datalen; uint32_t seq; bool init_done; struct linear_buffer *lb; }; #define SCRATCH_BUFFER_SIZE 1024 +#define SNL_WRITER_BUFFER_SIZE 256 typedef void snl_parse_field_f(struct snl_state *ss, void *hdr, void *target); struct snl_field_parser { uint16_t off_in; uint16_t off_out; snl_parse_field_f *cb; }; typedef bool snl_parse_attr_f(struct snl_state *ss, struct nlattr *attr, const void *arg, void *target); struct snl_attr_parser { uint16_t type; /* Attribute type */ uint16_t off; /* field offset in the target structure */ snl_parse_attr_f *cb; /* parser function to call */ const void *arg; /* Optional argument parser */ }; 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 */ }; #define SNL_DECLARE_PARSER(_name, _t, _fp, _np) \ 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), \ } #define SNL_DECLARE_ATTR_PARSER(_name, _np) \ static const struct snl_hdr_parser _name = { \ .np = &((_np)[0]), \ .np_size = NL_ARRAY_LEN(_np), \ } static inline void * snl_allocz(struct snl_state *ss, int len) { void *data = lb_allocz(ss->lb, len); if (data == NULL) { uint32_t size = ss->lb->size * 2; while (size < len + sizeof(struct linear_buffer)) size *= 2; struct linear_buffer *lb = lb_init(size); if (lb != NULL) { lb->next = ss->lb; ss->lb = lb; data = lb_allocz(ss->lb, len); } } return (data); } static inline void snl_clear_lb(struct snl_state *ss) { struct linear_buffer *lb = ss->lb; lb_clear(lb); lb = lb->next; ss->lb->next = NULL; /* Remove all linear bufs except the largest one */ while (lb != NULL) { struct linear_buffer *lb_next = lb->next; lb_free(lb); lb = lb_next; } } static void snl_free(struct snl_state *ss) { if (ss->init_done) { close(ss->fd); if (ss->buf != NULL) free(ss->buf); if (ss->lb != NULL) { snl_clear_lb(ss); lb_free(ss->lb); } } } static inline bool snl_init(struct snl_state *ss, int netlink_family) { memset(ss, 0, sizeof(*ss)); ss->fd = socket(AF_NETLINK, SOCK_RAW, netlink_family); if (ss->fd == -1) return (false); ss->init_done = true; int rcvbuf; socklen_t optlen = sizeof(rcvbuf); if (getsockopt(ss->fd, SOL_SOCKET, SO_RCVBUF, &rcvbuf, &optlen) == -1) { snl_free(ss); return (false); } ss->bufsize = rcvbuf; ss->buf = malloc(ss->bufsize); if (ss->buf == NULL) { snl_free(ss); return (false); } ss->lb = lb_init(SCRATCH_BUFFER_SIZE); if (ss->lb == NULL) { snl_free(ss); return (false); } return (true); } static inline bool snl_send(struct snl_state *ss, void *data, int sz) { return (send(ss->fd, data, sz, 0) == sz); } static inline uint32_t snl_get_seq(struct snl_state *ss) { return (++ss->seq); } static inline struct nlmsghdr * snl_read_message(struct snl_state *ss) { if (ss->off == ss->datalen) { struct sockaddr_nl nladdr; struct iovec iov = { .iov_base = ss->buf, .iov_len = ss->bufsize, }; struct msghdr msg = { .msg_name = &nladdr, .msg_namelen = sizeof(nladdr), .msg_iov = &iov, .msg_iovlen = 1, }; ss->off = 0; ss->datalen = 0; for (;;) { ssize_t datalen = recvmsg(ss->fd, &msg, 0); if (datalen > 0) { ss->datalen = datalen; break; } else if (errno != EINTR) return (NULL); } } struct nlmsghdr *hdr = (struct nlmsghdr *)(void *)&ss->buf[ss->off]; ss->off += NLMSG_ALIGN(hdr->nlmsg_len); return (hdr); } +static inline struct nlmsghdr * +snl_read_reply(struct snl_state *ss, uint32_t nlmsg_seq) +{ + while (true) { + struct nlmsghdr *hdr = snl_read_message(ss); + if (hdr == NULL) + break; + if (hdr->nlmsg_seq == nlmsg_seq) + return (hdr); + } + + return (NULL); +} + +static inline struct nlmsghdr * +snl_get_reply(struct snl_state *ss, struct nlmsghdr *hdr) +{ + uint32_t nlmsg_seq = hdr->nlmsg_seq; + + if (snl_send(ss, hdr, hdr->nlmsg_len)) + return (snl_read_reply(ss, nlmsg_seq)); + return (NULL); +} + /* * Checks that attributes are sorted by attribute type. */ static inline void snl_verify_parsers(const struct snl_hdr_parser **parser, int count) { for (int i = 0; i < count; i++) { const struct snl_hdr_parser *p = parser[i]; int attr_type = 0; for (int j = 0; j < p->np_size; j++) { assert(p->np[j].type > attr_type); attr_type = p->np[j].type; } } } #define SNL_VERIFY_PARSERS(_p) snl_verify_parsers((_p), NL_ARRAY_LEN(_p)) static const struct snl_attr_parser * find_parser(const struct snl_attr_parser *ps, int pslen, int key) { int left_i = 0, right_i = pslen - 1; if (key < ps[0].type || key > ps[pslen - 1].type) return (NULL); while (left_i + 1 < right_i) { int mid_i = (left_i + right_i) / 2; if (key < ps[mid_i].type) right_i = mid_i; else if (key > ps[mid_i].type) left_i = mid_i + 1; else return (&ps[mid_i]); } if (ps[left_i].type == key) return (&ps[left_i]); else if (ps[right_i].type == key) return (&ps[right_i]); return (NULL); } static inline bool snl_parse_attrs_raw(struct snl_state *ss, struct nlattr *nla_head, int len, const struct snl_attr_parser *ps, int pslen, void *target) { struct nlattr *nla; NLA_FOREACH(nla, nla_head, len) { if (nla->nla_len < sizeof(struct nlattr)) return (false); int nla_type = nla->nla_type & NLA_TYPE_MASK; const struct snl_attr_parser *s = find_parser(ps, pslen, nla_type); if (s != NULL) { void *ptr = (void *)((char *)target + s->off); if (!s->cb(ss, nla, s->arg, ptr)) return (false); } } return (true); } static inline bool snl_parse_attrs(struct snl_state *ss, struct nlmsghdr *hdr, int hdrlen, const struct snl_attr_parser *ps, int pslen, void *target) { int off = NLMSG_HDRLEN + NETLINK_ALIGN(hdrlen); int len = hdr->nlmsg_len - off; struct nlattr *nla_head = (struct nlattr *)(void *)((char *)hdr + off); return (snl_parse_attrs_raw(ss, nla_head, len, ps, pslen, target)); } static inline bool snl_parse_header(struct snl_state *ss, void *hdr, int len, const struct snl_hdr_parser *parser, void *target) { /* Extract fields first (if any) */ for (int i = 0; i < parser->fp_size; i++) { const struct snl_field_parser *fp = &parser->fp[i]; void *src = (char *)hdr + fp->off_in; void *dst = (char *)target + fp->off_out; fp->cb(ss, src, dst); } struct nlattr *nla_head = (struct nlattr *)(void *)((char *)hdr + parser->hdr_off); bool result = snl_parse_attrs_raw(ss, nla_head, len - parser->hdr_off, parser->np, parser->np_size, target); return (result); } static inline bool snl_parse_nlmsg(struct snl_state *ss, struct nlmsghdr *hdr, const struct snl_hdr_parser *parser, void *target) { return (snl_parse_header(ss, hdr + 1, hdr->nlmsg_len - sizeof(*hdr), parser, target)); } static inline bool snl_attr_get_flag(struct snl_state *ss __unused, struct nlattr *nla, void *target) { if (NLA_DATA_LEN(nla) == 0) { *((uint8_t *)target) = 1; return (true); } return (false); } static inline bool snl_attr_get_uint8(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { if (NLA_DATA_LEN(nla) == sizeof(uint8_t)) { *((uint8_t *)target) = *((const uint8_t *)NLA_DATA_CONST(nla)); return (true); } return (false); } static inline bool snl_attr_get_uint16(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { if (NLA_DATA_LEN(nla) == sizeof(uint16_t)) { *((uint16_t *)target) = *((const uint16_t *)NLA_DATA_CONST(nla)); return (true); } return (false); } static inline bool snl_attr_get_uint32(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { if (NLA_DATA_LEN(nla) == sizeof(uint32_t)) { *((uint32_t *)target) = *((const uint32_t *)NLA_DATA_CONST(nla)); return (true); } return (false); } static inline bool snl_attr_get_uint64(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { if (NLA_DATA_LEN(nla) == sizeof(uint64_t)) { memcpy(target, NLA_DATA_CONST(nla), sizeof(uint64_t)); return (true); } return (false); } static inline bool snl_attr_get_string(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { size_t maxlen = NLA_DATA_LEN(nla); if (strnlen((char *)NLA_DATA(nla), maxlen) < maxlen) { *((char **)target) = (char *)NLA_DATA(nla); return (true); } return (false); } static inline bool snl_attr_get_stringn(struct snl_state *ss, struct nlattr *nla, const void *arg __unused, void *target) { int maxlen = NLA_DATA_LEN(nla); char *buf = snl_allocz(ss, maxlen + 1); if (buf == NULL) return (false); buf[maxlen] = '\0'; memcpy(buf, NLA_DATA(nla), maxlen); *((char **)target) = buf; return (true); } static inline bool snl_attr_get_nested(struct snl_state *ss, struct nlattr *nla, const void *arg, void *target) { const struct snl_hdr_parser *p = (const struct snl_hdr_parser *)arg; /* Assumes target points to the beginning of the structure */ return (snl_parse_header(ss, NLA_DATA(nla), NLA_DATA_LEN(nla), p, target)); } static inline bool snl_attr_get_nla(struct snl_state *ss __unused, struct nlattr *nla, const void *arg __unused, void *target) { *((struct nlattr **)target) = nla; return (true); } static inline void snl_field_get_uint8(struct snl_state *ss __unused, void *src, void *target) { *((uint8_t *)target) = *((uint8_t *)src); } static inline void snl_field_get_uint16(struct snl_state *ss __unused, void *src, void *target) { *((uint16_t *)target) = *((uint16_t *)src); } static inline void snl_field_get_uint32(struct snl_state *ss __unused, void *src, void *target) { *((uint32_t *)target) = *((uint32_t *)src); } +struct snl_errmsg_data { + uint32_t nlmsg_seq; + int error; + char *error_str; + uint32_t error_offs; + struct nlattr *cookie; +}; +#define _IN(_field) offsetof(struct nlmsgerr, _field) +#define _OUT(_field) offsetof(struct snl_errmsg_data, _field) +static const struct snl_attr_parser nla_p_errmsg[] = { + { .type = NLMSGERR_ATTR_MSG, .off = _OUT(error_str), .cb = snl_attr_get_string }, + { .type = NLMSGERR_ATTR_OFFS, .off = _OUT(error_offs), .cb = snl_attr_get_uint32 }, + { .type = NLMSGERR_ATTR_COOKIE, .off = _OUT(cookie), .cb = snl_attr_get_nla }, +}; + +static const struct snl_field_parser nlf_p_errmsg[] = { + { .off_in = _IN(error), .off_out = _OUT(error), .cb = snl_field_get_uint32 }, + { .off_in = _IN(msg.nlmsg_seq), .off_out = _OUT(nlmsg_seq), .cb = snl_field_get_uint32 }, +}; +#undef _IN +#undef _OUT +SNL_DECLARE_PARSER(snl_errmsg_parser, struct nlmsgerr, nlf_p_errmsg, nla_p_errmsg); + +static inline bool +snl_check_return(struct snl_state *ss, struct nlmsghdr *hdr, struct snl_errmsg_data *e) +{ + if (hdr != NULL && hdr->nlmsg_type == NLMSG_ERROR) + return (snl_parse_nlmsg(ss, hdr, &snl_errmsg_parser, e)); + return (false); +} + +/* writer logic */ +struct snl_writer { + char *base; + uint32_t offset; + uint32_t size; + struct nlmsghdr *hdr; + struct snl_state *ss; + bool error; +}; + +static inline void +snl_init_writer(struct snl_state *ss, struct snl_writer *nw) +{ + nw->size = SNL_WRITER_BUFFER_SIZE; + nw->base = snl_allocz(ss, nw->size); + if (nw->base == NULL) { + nw->error = true; + nw->size = 0; + } + + nw->offset = 0; + nw->hdr = NULL; + nw->error = false; + nw->ss = ss; +} + +static inline bool +snl_realloc_msg_buffer(struct snl_writer *nw, size_t sz) +{ + uint32_t new_size = nw->size * 2; + + while (new_size < nw->size + sz) + new_size *= 2; + + if (nw->error) + return (false); + + void *new_base = snl_allocz(nw->ss, new_size); + if (new_base == NULL) { + nw->error = true; + return (false); + } + + memcpy(new_base, nw->base, nw->offset); + if (nw->hdr != NULL) { + int hdr_off = (char *)(nw->hdr) - nw->base; + nw->hdr = (struct nlmsghdr *)(void *)((char *)new_base + hdr_off); + } + nw->base = new_base; + + return (true); +} + +static inline void * +snl_reserve_msg_data_raw(struct snl_writer *nw, size_t sz) +{ + sz = NETLINK_ALIGN(sz); + + if (__predict_false(nw->offset + sz > nw->size)) { + if (!snl_realloc_msg_buffer(nw, sz)) + return (NULL); + } + + void *data_ptr = &nw->base[nw->offset]; + nw->offset += sz; + + return (data_ptr); +} +#define snl_reserve_msg_object(_ns, _t) ((_t *)snl_reserve_msg_data_raw(_ns, sizeof(_t))) +#define snl_reserve_msg_data(_ns, _sz, _t) ((_t *)snl_reserve_msg_data_raw(_ns, _sz)) + +static inline void * +_snl_reserve_msg_attr(struct snl_writer *nw, uint16_t nla_type, uint16_t sz) +{ + sz += sizeof(struct nlattr); + + struct nlattr *nla = snl_reserve_msg_data(nw, sz, struct nlattr); + if (__predict_false(nla == NULL)) + return (NULL); + nla->nla_type = nla_type; + nla->nla_len = sz; + + return ((void *)(nla + 1)); +} +#define snl_reserve_msg_attr(_ns, _at, _t) ((_t *)_snl_reserve_msg_attr(_ns, _at, sizeof(_t))) + +static inline bool +snl_add_msg_attr(struct snl_writer *nw, int attr_type, int attr_len, const void *data) +{ + int required_len = NLA_ALIGN(attr_len + sizeof(struct nlattr)); + + if (__predict_false(nw->offset + required_len > nw->size)) { + if (!snl_realloc_msg_buffer(nw, required_len)) + return (false); + } + + struct nlattr *nla = (struct nlattr *)(&nw->base[nw->offset]); + + nla->nla_len = attr_len + sizeof(struct nlattr); + nla->nla_type = attr_type; + if (attr_len > 0) { + if ((attr_len % 4) != 0) { + /* clear padding bytes */ + bzero((char *)nla + required_len - 4, 4); + } + memcpy((nla + 1), data, attr_len); + } + nw->offset += required_len; + return (true); +} + +static inline bool +snl_add_msg_attr_raw(struct snl_writer *nw, const struct nlattr *nla_src) +{ + int attr_len = nla_src->nla_len - sizeof(struct nlattr); + + assert(attr_len >= 0); + + return (snl_add_msg_attr(nw, nla_src->nla_type, attr_len, (const void *)(nla_src + 1))); +} + +static inline bool +snl_add_msg_attr_u8(struct snl_writer *nw, int attrtype, uint8_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(uint8_t), &value)); +} + +static inline bool +snl_add_msg_attr_u16(struct snl_writer *nw, int attrtype, uint16_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(uint16_t), &value)); +} + +static inline bool +snl_add_msg_attr_u32(struct snl_writer *nw, int attrtype, uint32_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(uint32_t), &value)); +} + +static inline bool +snl_add_msg_attr_u64(struct snl_writer *nw, int attrtype, uint64_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(uint64_t), &value)); +} + +static inline bool +snl_add_msg_attr_s8(struct snl_writer *nw, int attrtype, int8_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(int8_t), &value)); +} + +static inline bool +snl_add_msg_attr_s16(struct snl_writer *nw, int attrtype, int16_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(int16_t), &value)); +} + +static inline bool +snl_add_msg_attr_s32(struct snl_writer *nw, int attrtype, int32_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(int32_t), &value)); +} + +static inline bool +snl_add_msg_attr_s64(struct snl_writer *nw, int attrtype, int64_t value) +{ + return (snl_add_msg_attr(nw, attrtype, sizeof(int64_t), &value)); +} + +static inline bool +snl_add_msg_attr_flag(struct snl_writer *nw, int attrtype) +{ + return (snl_add_msg_attr(nw, attrtype, 0, NULL)); +} + +static inline bool +snl_add_msg_attr_string(struct snl_writer *nw, int attrtype, const char *str) +{ + return (snl_add_msg_attr(nw, attrtype, strlen(str) + 1, str)); +} + + +static inline int +snl_get_msg_offset(const struct snl_writer *nw) +{ + return (nw->offset - ((char *)nw->hdr - nw->base)); +} + +static inline void * +_snl_restore_msg_offset(const struct snl_writer *nw, int off) +{ + return ((void *)((char *)nw->hdr + off)); +} +#define snl_restore_msg_offset(_ns, _off, _t) ((_t *)_snl_restore_msg_offset(_ns, _off)) + +static inline int +snl_add_msg_attr_nested(struct snl_writer *nw, int attrtype) +{ + int off = snl_get_msg_offset(nw); + struct nlattr *nla = snl_reserve_msg_data(nw, sizeof(struct nlattr), struct nlattr); + if (__predict_false(nla == NULL)) + return (0); + nla->nla_type = attrtype; + return (off); +} + +static inline void +snl_end_attr_nested(const struct snl_writer *nw, int off) +{ + if (!nw->error) { + struct nlattr *nla = snl_restore_msg_offset(nw, off, struct nlattr); + nla->nla_len = NETLINK_ALIGN(snl_get_msg_offset(nw) - off); + } +} + +static inline struct nlmsghdr * +snl_create_msg_request(struct snl_writer *nw, int nlmsg_type) +{ + assert(nw->hdr == NULL); + + struct nlmsghdr *hdr = snl_reserve_msg_object(nw, struct nlmsghdr); + hdr->nlmsg_type = nlmsg_type; + hdr->nlmsg_flags = NLM_F_REQUEST | NLM_F_ACK; + nw->hdr = hdr; + + return (hdr); +} + +static void +snl_abort_msg(struct snl_writer *nw) +{ + if (nw->hdr != NULL) { + int offset = (char *)(&nw->base[nw->offset]) - (char *)(nw->hdr); + + nw->offset -= offset; + nw->hdr = NULL; + } +} + +static inline struct nlmsghdr * +snl_finalize_msg(struct snl_writer *nw) +{ + if (nw->error) + snl_abort_msg(nw); + if (nw->hdr != NULL) { + struct nlmsghdr *hdr = nw->hdr; + + int offset = (char *)(&nw->base[nw->offset]) - (char *)(nw->hdr); + hdr->nlmsg_len = offset; + hdr->nlmsg_seq = snl_get_seq(nw->ss); + nw->hdr = NULL; + + return (hdr); + } + return (NULL); +} + +static bool +snl_send_msgs(struct snl_writer *nw) +{ + int offset = nw->offset; + + assert(nw->hdr == NULL); + nw->offset = 0; + + return (snl_send(nw->ss, nw->base, offset)); +} + #endif diff --git a/sys/netlink/netlink_snl_route.h b/sys/netlink/netlink_snl_route.h index 4adb3d697ecd..281794a9d6f7 100644 --- a/sys/netlink/netlink_snl_route.h +++ b/sys/netlink/netlink_snl_route.h @@ -1,130 +1,166 @@ /*- * SPDX-License-Identifier: BSD-2-Clause-FreeBSD * * Copyright (c) 2022 Alexander V. Chernikov * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #ifndef _NETLINK_NETLINK_SNL_ROUTE_H_ #define _NETLINK_NETLINK_SNL_ROUTE_H_ #include #include #include /* * Simple Netlink Library - NETLINK_ROUTE helpers */ static inline struct sockaddr * parse_rta_ip4(struct snl_state *ss, void *rta_data, int *perror) { struct sockaddr_in *sin; sin = (struct sockaddr_in *)snl_allocz(ss, sizeof(struct sockaddr_in)); if (sin == NULL) { *perror = ENOBUFS; return (NULL); } sin->sin_len = sizeof(struct sockaddr_in); sin->sin_family = AF_INET; memcpy(&sin->sin_addr, rta_data, sizeof(struct in_addr)); return ((struct sockaddr *)sin); } static inline struct sockaddr * parse_rta_ip6(struct snl_state *ss, void *rta_data, int *perror) { struct sockaddr_in6 *sin6; sin6 = (struct sockaddr_in6 *)snl_allocz(ss, sizeof(struct sockaddr_in6)); if (sin6 == NULL) { *perror = ENOBUFS; return (NULL); } sin6->sin6_len = sizeof(struct sockaddr_in6); sin6->sin6_family = AF_INET6; memcpy(&sin6->sin6_addr, rta_data, sizeof(struct in6_addr)); return ((struct sockaddr *)sin6); } static inline struct sockaddr * parse_rta_ip(struct snl_state *ss, struct rtattr *rta, int *perror) { void *rta_data = NL_RTA_DATA(rta); int rta_len = NL_RTA_DATA_LEN(rta); if (rta_len == sizeof(struct in_addr)) { return (parse_rta_ip4(ss, rta_data, perror)); } else if (rta_len == sizeof(struct in6_addr)) { return (parse_rta_ip6(ss, rta_data, perror)); } else { *perror = ENOTSUP; return (NULL); } return (NULL); } static inline bool snl_attr_get_ip(struct snl_state *ss, struct nlattr *nla, const void *arg __unused, void *target) { int error = 0; struct sockaddr *sa = parse_rta_ip(ss, (struct rtattr *)nla, &error); if (error == 0) { *((struct sockaddr **)target) = sa; return (true); } return (false); } static inline struct sockaddr * parse_rta_via(struct snl_state *ss, struct rtattr *rta, int *perror) { struct rtvia *via = NL_RTA_DATA(rta); switch (via->rtvia_family) { case AF_INET: return (parse_rta_ip4(ss, via->rtvia_addr, perror)); case AF_INET6: return (parse_rta_ip6(ss, via->rtvia_addr, perror)); default: *perror = ENOTSUP; return (NULL); } } static inline bool snl_attr_get_ipvia(struct snl_state *ss, struct nlattr *nla, const void *arg __unused, void *target) { int error = 0; struct sockaddr *sa = parse_rta_via(ss, (struct rtattr *)nla, &error); if (error == 0) { *((struct sockaddr **)target) = sa; return (true); } return (false); } +static inline bool +snl_add_msg_attr_ip(struct snl_writer *nw, int attrtype, const struct sockaddr *sa) +{ + const void *addr; + + switch (sa->sa_family) { + case AF_INET: + addr = &((const struct sockaddr_in *)sa)->sin_addr; + return (snl_add_msg_attr(nw, attrtype, 4, addr)); + case AF_INET6: + addr = &((const struct sockaddr_in6 *)sa)->sin6_addr; + return (snl_add_msg_attr(nw, attrtype, 16, addr)); + } + + return (false); +} + +static inline bool +snl_add_msg_attr_ipvia(struct snl_writer *nw, int attrtype, const struct sockaddr *sa) +{ + char buf[17]; + + buf[0] = sa->sa_family; + + switch (sa->sa_family) { + case AF_INET: + memcpy(&buf[1], &((const struct sockaddr_in *)sa)->sin_addr, 4); + return (snl_add_msg_attr(nw, attrtype, 5, buf)); + case AF_INET6: + memcpy(&buf[1], &((const struct sockaddr_in6 *)sa)->sin6_addr, 16); + return (snl_add_msg_attr(nw, attrtype, 17, buf)); + } + + return (false); +} + #endif