attrs.scm
1 | ;;;; Copyright (C) 2020 Julien Lepiller <julien@lepiller.eu> |
2 | ;;;; |
3 | ;;;; This library is free software; you can redistribute it and/or |
4 | ;;;; modify it under the terms of the GNU Lesser General Public |
5 | ;;;; License as published by the Free Software Foundation; either |
6 | ;;;; version 3 of the License, or (at your option) any later version. |
7 | ;;;; |
8 | ;;;; This library is distributed in the hope that it will be useful, |
9 | ;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of |
10 | ;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
11 | ;;;; Lesser General Public License for more details. |
12 | ;;;; |
13 | ;;;; You should have received a copy of the GNU Lesser General Public |
14 | ;;;; License along with this library; if not, write to the Free Software |
15 | ;;;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
16 | ;;;; |
17 | |
18 | (define-module (netlink route attrs) |
19 | #:use-module (ice-9 match) |
20 | #:use-module (netlink constant) |
21 | #:use-module (netlink data) |
22 | #:use-module (rnrs bytevectors) |
23 | #:use-module (srfi srfi-9) |
24 | #:export(make-route-attr |
25 | route-attr? |
26 | route-attr-kind |
27 | route-attr-data |
28 | route-attr-size |
29 | make-u8-route-attr |
30 | make-u16-route-attr |
31 | make-u32-route-attr |
32 | make-s32-route-attr |
33 | make-string-route-attr |
34 | make-ethernet-route-attr |
35 | make-ipv4-route-attr |
36 | make-ipv6-route-attr |
37 | make-bv-route-attr |
38 | deserialize-route-attr |
39 | deserialize-route-attr-data-string |
40 | deserialize-route-attr-data-u8 |
41 | deserialize-route-attr-data-u32 |
42 | deserialize-route-attr-data-s32 |
43 | deserialize-route-attr-data-ethernet |
44 | deserialize-route-attr-data-ipv4 |
45 | deserialize-route-attr-data-ipv6 |
46 | deserialize-route-attr-data-bv |
47 | default-route-attr-decoder |
48 | %default-route-link-attr-decoder |
49 | %default-route-ipv4-attr-decoder |
50 | %default-route-ipv6-attr-decoder)) |
51 | |
52 | (define-data-type route-attr |
53 | attr-type-size |
54 | (lambda (attr pos bv) |
55 | (match attr |
56 | (($ route-attr-type type data) |
57 | (bytevector-u16-set! bv pos (attr-type-size attr) (native-endianness)) |
58 | (bytevector-u16-set! bv (+ pos 2) type (native-endianness)) |
59 | (serialize data (+ pos 4) bv)))) |
60 | (type route-attr-kind route-attr-type-type) |
61 | (data route-attr-data route-attr-type-data)) |
62 | |
63 | (define (attr-type-size attr) |
64 | (+ 4 (data-size (route-attr-type-data attr)))) |
65 | |
66 | (define (make-u8-route-attr num) |
67 | (make-nl-data |
68 | num |
69 | (const 1) |
70 | (lambda (data pos bv) |
71 | (bytevector-u8-set! bv pos data)))) |
72 | |
73 | (define (make-u16-route-attr num) |
74 | (make-nl-data |
75 | num |
76 | (const 2) |
77 | (lambda (data pos bv) |
78 | (bytevector-u16-set! bv pos data (native-endianness))))) |
79 | |
80 | (define (make-u32-route-attr num) |
81 | (make-nl-data |
82 | num |
83 | (const 4) |
84 | (lambda (data pos bv) |
85 | (bytevector-u32-set! bv pos data (native-endianness))))) |
86 | |
87 | (define (make-s32-route-attr num) |
88 | (make-nl-data |
89 | num |
90 | (const 4) |
91 | (lambda (data pos bv) |
92 | (bytevector-s32-set! bv pos data (native-endianness))))) |
93 | |
94 | (define (make-string-route-attr str) |
95 | (make-nl-data |
96 | str |
97 | (lambda (str) (bytevector-length (string->utf8 str))) |
98 | (lambda (data pos bv) |
99 | (let ((s (string->utf8 data))) |
100 | (bytevector-copy! s 0 bv pos (bytevector-length s)))))) |
101 | |
102 | (define (ethernet->bv addr) |
103 | (u8-list->bytevector (map (lambda (n) (string->number n 16)) |
104 | (string-split addr #\:)))) |
105 | (define (make-ethernet-route-attr addr) |
106 | (make-nl-data |
107 | addr |
108 | (lambda (addr) (bytevector-length (ethernet->bv addr))) |
109 | (lambda (data pos bv) |
110 | (let ((a (ethernet->bv data))) |
111 | (bytevector-copy! a 0 bv pos (bytevector-length a)))))) |
112 | |
113 | (define (ipv4->bv addr) |
114 | (u8-list->bytevector (map (lambda (n) (string->number n)) |
115 | (string-split addr #\.)))) |
116 | (define (make-ipv4-route-attr addr) |
117 | (make-nl-data |
118 | addr |
119 | (lambda (addr) (bytevector-length (ipv4->bv addr))) |
120 | (lambda (data pos bv) |
121 | (let ((a (ipv4->bv data))) |
122 | (bytevector-copy! a 0 bv pos (bytevector-length a)))))) |
123 | |
124 | ;16 bytes |
125 | (define (ipv6->bv addr) |
126 | (let loop ((num (inet-pton AF_INET6 addr)) (lst '())) |
127 | (match lst |
128 | ((_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _) |
129 | (u8-list->bytevector (reverse lst))) |
130 | (_ |
131 | (loop (quotient num 256) (cons (modulo num 256) lst)))))) |
132 | (define (make-ipv6-route-attr addr) |
133 | (make-nl-data |
134 | addr |
135 | (lambda (addr) (bytevector-length (ipv6->bv addr))) |
136 | (lambda (data pos bv) |
137 | (let ((a (ipv6->bv data))) |
138 | (bytevector-copy! a 0 bv pos (bytevector-length a)))))) |
139 | |
140 | (define (make-bv-route-attr bv) |
141 | (make-nl-data |
142 | bv |
143 | (lambda (bv) (bytevector-length bv)) |
144 | (lambda (data pos bv) |
145 | (bytevector-copy! data 0 bv pos (bytevector-length data))))) |
146 | |
147 | (define (deserialize-route-attr message-type) |
148 | (lambda (decoder bv pos) |
149 | (let* ((len (bytevector-u16-ref bv pos (native-endianness))) |
150 | (type (bytevector-u16-ref bv (+ pos 2) (native-endianness))) |
151 | (deserialize (get-next-deserialize decoder message-type type)) |
152 | (data-bv (make-bytevector (- len 4)))) |
153 | (bytevector-copy! bv (+ pos 4) data-bv 0 (- len 4)) |
154 | (make-route-attr |
155 | type |
156 | (deserialize decoder data-bv 0))))) |
157 | |
158 | (define (deserialize-route-attr-data-string decoder bv pos) |
159 | (make-string-route-attr |
160 | (or (false-if-exception (utf8->string bv)) |
161 | (make-string (bytevector-length bv) #\a)))) |
162 | |
163 | (define (deserialize-route-attr-data-u32 decoder bv pos) |
164 | (make-u32-route-attr (bytevector-u32-ref bv pos (native-endianness)))) |
165 | |
166 | (define (deserialize-route-attr-data-s32 decoder bv pos) |
167 | (make-s32-route-attr (bytevector-s32-ref bv pos (native-endianness)))) |
168 | |
169 | (define (deserialize-route-attr-data-u8 decoder bv pos) |
170 | (make-u8-route-attr (bytevector-u8-ref bv pos))) |
171 | |
172 | (define (deserialize-route-attr-data-bv decoder bv pos) |
173 | (make-bv-route-attr bv)) |
174 | |
175 | (define (deserialize-route-attr-data-ethernet decoder bv pos) |
176 | (make-ethernet-route-attr |
177 | (string-join (map (lambda (n) (number->string n 16)) |
178 | (bytevector->u8-list bv)) |
179 | ":"))) |
180 | |
181 | (define (deserialize-route-attr-data-ipv4 decoder bv pos) |
182 | (make-ipv4-route-attr |
183 | (string-join (map (lambda (n) (number->string n)) |
184 | (bytevector->u8-list bv)) |
185 | "."))) |
186 | |
187 | (define (deserialize-route-attr-data-ipv6 decoder bv pos) |
188 | (define (ipv6->number addr) |
189 | (let loop ((addr (bytevector->u8-list addr)) (num 0)) |
190 | (match addr |
191 | (() num) |
192 | ((byte addr ...) |
193 | (loop addr (+ (* 256 num) byte)))))) |
194 | (make-ipv6-route-attr |
195 | (inet-ntop AF_INET6 (ipv6->number bv)))) |
196 | |
197 | (define (default-route-attr-decoder deserialize-addr) |
198 | `((,IFLA_IFNAME . ,deserialize-route-attr-data-string) |
199 | (,IFLA_QDISC . ,deserialize-route-attr-data-string) |
200 | (,IFLA_IFALIAS . ,deserialize-route-attr-data-string) |
201 | (,IFLA_PHYS_PORT_NAME . ,deserialize-route-attr-data-string) |
202 | (,IFLA_MTU . ,deserialize-route-attr-data-u32) |
203 | (,IFLA_TXQLEN . ,deserialize-route-attr-data-u32) |
204 | (,IFLA_LINK . ,deserialize-route-attr-data-u32) |
205 | (,IFLA_WEIGHT . ,deserialize-route-attr-data-u32) |
206 | (,IFLA_MASTER . ,deserialize-route-attr-data-u32) |
207 | (,IFLA_NUM_VF . ,deserialize-route-attr-data-u32) |
208 | (,IFLA_PROMISCUITY . ,deserialize-route-attr-data-u32) |
209 | (,IFLA_NUM_TX_QUEUES . ,deserialize-route-attr-data-u32) |
210 | (,IFLA_NUM_RX_QUEUES . ,deserialize-route-attr-data-u32) |
211 | (,IFLA_GSO_MAX_SEGS . ,deserialize-route-attr-data-u32) |
212 | (,IFLA_GSO_MAX_SIZE . ,deserialize-route-attr-data-u32) |
213 | (,IFLA_GROUP . ,deserialize-route-attr-data-u32) |
214 | (,IFLA_CARRIER_CHANGES . ,deserialize-route-attr-data-u32) |
215 | (,IFLA_NET_NS_PID . ,deserialize-route-attr-data-u32) |
216 | (,IFLA_NET_NS_FD . ,deserialize-route-attr-data-u32) |
217 | (,IFLA_NEW_IFINDEX . ,deserialize-route-attr-data-u32) |
218 | (,IFLA_MIN_MTU . ,deserialize-route-attr-data-u32) |
219 | (,IFLA_MAX_MTU . ,deserialize-route-attr-data-u32) |
220 | (,IFLA_CARRIER_UP_COUNT . ,deserialize-route-attr-data-u32) |
221 | (,IFLA_CARRIER_DOWN_COUNT . ,deserialize-route-attr-data-u32) |
222 | (,IFLA_OPERSTATE . ,deserialize-route-attr-data-u8) |
223 | (,IFLA_LINKMODE . ,deserialize-route-attr-data-u8) |
224 | (,IFLA_CARRIER . ,deserialize-route-attr-data-u8) |
225 | (,IFLA_PROTO_DOWN . ,deserialize-route-attr-data-u8) |
226 | (,IFLA_ADDRESS . ,deserialize-addr) |
227 | (,IFLA_BROADCAST . ,deserialize-addr) |
228 | (,IFLA_PERM_ADDRESS . ,deserialize-addr) |
229 | (default . ,deserialize-route-attr-data-bv))) |
230 | |
231 | (define %default-route-link-attr-decoder |
232 | (default-route-attr-decoder deserialize-route-attr-data-ethernet)) |
233 | |
234 | (define %default-route-ipv4-attr-decoder |
235 | (default-route-attr-decoder deserialize-route-attr-data-ipv4)) |
236 | |
237 | (define %default-route-ipv6-attr-decoder |
238 | (default-route-attr-decoder deserialize-route-attr-data-ipv6)) |
239 |