From c6f909bd0f40c58f39f857e1c57638cb41241fa2 Mon Sep 17 00:00:00 2001 From: Andrea Claudi Date: Thu, 4 Jun 2020 21:43:01 +0200 Subject: [PATCH] iproute_lwtunnel: add options support for geneve metadata Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1830485 Upstream Status: unknown commit ca7614d4c6f45 commit ca7614d4c6f456187d831a8202bb4a8559a72f8b Author: Xin Long Date: Mon Apr 27 18:27:45 2020 +0800 iproute_lwtunnel: add options support for geneve metadata This patch is to add LWTUNNEL_IP(6)_OPTS and LWTUNNEL_IP_OPTS_GENEVE's parse and print to implement geneve options support in iproute_lwtunnel. Options are expressed as class:type:data and multiple options may be listed using a comma delimiter, class and type are numbers and data is a hex string. With this patch, users can add and dump geneve options like: # ip netns add a # ip netns add b # ip -n a link add eth0 type veth peer name eth0 netns b # ip -n a link set eth0 up; ip -n b link set eth0 up # ip -n a addr add 10.1.0.1/24 dev eth0 # ip -n b addr add 10.1.0.2/24 dev eth0 # ip -n b link add geneve1 type geneve id 1 remote 10.1.0.1 ttl 64 # ip -n b addr add 1.1.1.1/24 dev geneve1 # ip -n b link set geneve1 up # ip -n b route add 2.1.1.0/24 dev geneve1 # ip -n a link add geneve1 type geneve external # ip -n a addr add 2.1.1.1/24 dev geneve1 # ip -n a link set geneve1 up # ip -n a route add 1.1.1.0/24 encap ip id 1 geneve_opts \ 1:1:1212121234567890,1:1:1212121234567890,1:1:1212121234567890 \ dst 10.1.0.2 dev geneve1 # ip -n a route show # ip netns exec a ping 1.1.1.1 -c 1 1.1.1.0/24 encap ip id 1 src 0.0.0.0 dst 10.1.0.2 ttl 0 tos 0 geneve_opts 1:1:1212121234567890,1:1:1212121234567890 ... PING 1.1.1.1 (1.1.1.1) 56(84) bytes of data. 64 bytes from 1.1.1.1: icmp_seq=1 ttl=64 time=0.079 ms v1->v2: - improve the changelog. - use PRINT_ANY to support dumping with json format. v2->v3: - implement proper JSON array for opts instead of just bunch of strings. v3->v4: - keep the same format between input and output, json and non json. - print class and type as uint and print data as hex string. Signed-off-by: Xin Long Signed-off-by: David Ahern --- ip/iproute_lwtunnel.c | 174 +++++++++++++++++++++++++++++++++++++++++- 1 file changed, 172 insertions(+), 2 deletions(-) diff --git a/ip/iproute_lwtunnel.c b/ip/iproute_lwtunnel.c index 60f34a32a6e5b..76d906c47c44f 100644 --- a/ip/iproute_lwtunnel.c +++ b/ip/iproute_lwtunnel.c @@ -291,6 +291,54 @@ static void print_encap_mpls(FILE *fp, struct rtattr *encap) rta_getattr_u8(tb[MPLS_IPTUNNEL_TTL])); } +static void lwtunnel_print_geneve_opts(struct rtattr *attr) +{ + struct rtattr *tb[LWTUNNEL_IP_OPT_GENEVE_MAX + 1]; + struct rtattr *i = RTA_DATA(attr); + int rem = RTA_PAYLOAD(attr); + char *name = "geneve_opts"; + int data_len, offset = 0; + char data[rem * 2 + 1]; + __u16 class; + __u8 type; + + print_nl(); + print_string(PRINT_FP, name, "\t%s ", name); + open_json_array(PRINT_JSON, name); + + while (rem) { + parse_rtattr(tb, LWTUNNEL_IP_OPT_GENEVE_MAX, i, rem); + class = rta_getattr_be16(tb[LWTUNNEL_IP_OPT_GENEVE_CLASS]); + type = rta_getattr_u8(tb[LWTUNNEL_IP_OPT_GENEVE_TYPE]); + data_len = RTA_PAYLOAD(tb[LWTUNNEL_IP_OPT_GENEVE_DATA]); + hexstring_n2a(RTA_DATA(tb[LWTUNNEL_IP_OPT_GENEVE_DATA]), + data_len, data, sizeof(data)); + offset += data_len + 20; + rem -= data_len + 20; + i = RTA_DATA(attr) + offset; + + open_json_object(NULL); + print_uint(PRINT_ANY, "class", "%u", class); + print_uint(PRINT_ANY, "type", ":%u", type); + if (rem) + print_string(PRINT_ANY, "data", ":%s,", data); + else + print_string(PRINT_ANY, "data", ":%s ", data); + close_json_object(); + } + + close_json_array(PRINT_JSON, name); +} + +static void lwtunnel_print_opts(struct rtattr *attr) +{ + struct rtattr *tb_opt[LWTUNNEL_IP_OPTS_MAX + 1]; + + parse_rtattr_nested(tb_opt, LWTUNNEL_IP_OPTS_MAX, attr); + if (tb_opt[LWTUNNEL_IP_OPTS_GENEVE]) + lwtunnel_print_geneve_opts(tb_opt[LWTUNNEL_IP_OPTS_GENEVE]); +} + static void print_encap_ip(FILE *fp, struct rtattr *encap) { struct rtattr *tb[LWTUNNEL_IP_MAX+1]; @@ -329,6 +377,9 @@ static void print_encap_ip(FILE *fp, struct rtattr *encap) if (flags & TUNNEL_SEQ) print_bool(PRINT_ANY, "seq", "seq ", true); } + + if (tb[LWTUNNEL_IP_OPTS]) + lwtunnel_print_opts(tb[LWTUNNEL_IP_OPTS]); } static void print_encap_ila(FILE *fp, struct rtattr *encap) @@ -401,6 +452,9 @@ static void print_encap_ip6(FILE *fp, struct rtattr *encap) if (flags & TUNNEL_SEQ) print_bool(PRINT_ANY, "seq", "seq ", true); } + + if (tb[LWTUNNEL_IP6_OPTS]) + lwtunnel_print_opts(tb[LWTUNNEL_IP6_OPTS]); } static void print_encap_bpf(FILE *fp, struct rtattr *encap) @@ -795,11 +849,97 @@ static int parse_encap_mpls(struct rtattr *rta, size_t len, return 0; } +static int lwtunnel_parse_geneve_opt(char *str, size_t len, struct rtattr *rta) +{ + struct rtattr *nest; + char *token; + int i, err; + + nest = rta_nest(rta, len, LWTUNNEL_IP_OPTS_GENEVE | NLA_F_NESTED); + i = 1; + token = strsep(&str, ":"); + while (token) { + switch (i) { + case LWTUNNEL_IP_OPT_GENEVE_CLASS: + { + __be16 opt_class; + + if (!strlen(token)) + break; + err = get_be16(&opt_class, token, 0); + if (err) + return err; + + rta_addattr16(rta, len, i, opt_class); + break; + } + case LWTUNNEL_IP_OPT_GENEVE_TYPE: + { + __u8 opt_type; + + if (!strlen(token)) + break; + err = get_u8(&opt_type, token, 0); + if (err) + return err; + + rta_addattr8(rta, len, i, opt_type); + break; + } + case LWTUNNEL_IP_OPT_GENEVE_DATA: + { + size_t token_len = strlen(token); + __u8 *opts; + + if (!token_len) + break; + opts = malloc(token_len / 2); + if (!opts) + return -1; + if (hex2mem(token, opts, token_len / 2) < 0) { + free(opts); + return -1; + } + rta_addattr_l(rta, len, i, opts, token_len / 2); + free(opts); + + break; + } + default: + fprintf(stderr, "Unknown \"geneve_opts\" type\n"); + return -1; + } + + token = strsep(&str, ":"); + i++; + } + rta_nest_end(rta, nest); + + return 0; +} + +static int lwtunnel_parse_geneve_opts(char *str, size_t len, struct rtattr *rta) +{ + char *token; + int err; + + token = strsep(&str, ","); + while (token) { + err = lwtunnel_parse_geneve_opt(token, len, rta); + if (err) + return err; + + token = strsep(&str, ","); + } + + return 0; +} + static int parse_encap_ip(struct rtattr *rta, size_t len, int *argcp, char ***argvp) { int id_ok = 0, dst_ok = 0, src_ok = 0, tos_ok = 0, ttl_ok = 0; - int key_ok = 0, csum_ok = 0, seq_ok = 0; + int key_ok = 0, csum_ok = 0, seq_ok = 0, opts_ok = 0; char **argv = *argvp; int argc = *argcp; int ret = 0; @@ -851,6 +991,21 @@ static int parse_encap_ip(struct rtattr *rta, size_t len, if (get_u8(&ttl, *argv, 0)) invarg("\"ttl\" value is invalid\n", *argv); ret = rta_addattr8(rta, len, LWTUNNEL_IP_TTL, ttl); + } else if (strcmp(*argv, "geneve_opts") == 0) { + struct rtattr *nest; + + if (opts_ok++) + duparg2("opts", *argv); + + NEXT_ARG(); + + nest = rta_nest(rta, len, + LWTUNNEL_IP_OPTS | NLA_F_NESTED); + ret = lwtunnel_parse_geneve_opts(*argv, len, rta); + if (ret) + invarg("\"geneve_opts\" value is invalid\n", + *argv); + rta_nest_end(rta, nest); } else if (strcmp(*argv, "key") == 0) { if (key_ok++) duparg2("key", *argv); @@ -966,7 +1121,7 @@ static int parse_encap_ip6(struct rtattr *rta, size_t len, int *argcp, char ***argvp) { int id_ok = 0, dst_ok = 0, src_ok = 0, tos_ok = 0, ttl_ok = 0; - int key_ok = 0, csum_ok = 0, seq_ok = 0; + int key_ok = 0, csum_ok = 0, seq_ok = 0, opts_ok = 0; char **argv = *argvp; int argc = *argcp; int ret = 0; @@ -1020,6 +1175,21 @@ static int parse_encap_ip6(struct rtattr *rta, size_t len, *argv); ret = rta_addattr8(rta, len, LWTUNNEL_IP6_HOPLIMIT, hoplimit); + } else if (strcmp(*argv, "geneve_opts") == 0) { + struct rtattr *nest; + + if (opts_ok++) + duparg2("opts", *argv); + + NEXT_ARG(); + + nest = rta_nest(rta, len, + LWTUNNEL_IP_OPTS | NLA_F_NESTED); + ret = lwtunnel_parse_geneve_opts(*argv, len, rta); + if (ret) + invarg("\"geneve_opts\" value is invalid\n", + *argv); + rta_nest_end(rta, nest); } else if (strcmp(*argv, "key") == 0) { if (key_ok++) duparg2("key", *argv); -- 2.26.2