1 /* Copyright (C) 2008 Board of Trustees, Leland Stanford Jr. University.
3 * Permission is hereby granted, free of charge, to any person obtaining a copy
4 * of this software and associated documentation files (the "Software"), to
5 * deal in the Software without restriction, including without limitation the
6 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
7 * sell copies of the Software, and to permit persons to whom the Software is
8 * furnished to do so, subject to the following conditions:
10 * The above copyright notice and this permission notice shall be included in
11 * all copies or substantial portions of the Software.
13 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
14 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
15 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
16 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
17 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
18 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
22 #include "switch-flow.h"
23 #include <arpa/inet.h>
31 /* Internal function used to compare fields in flow. */
33 int flow_fields_match(const struct flow *a, const struct flow *b, uint16_t w)
35 return ((w & OFPFW_IN_PORT || a->in_port == b->in_port)
36 && (w & OFPFW_DL_VLAN || a->dl_vlan == b->dl_vlan)
37 && (w & OFPFW_DL_SRC || !memcmp(a->dl_src, b->dl_src, ETH_ADDR_LEN))
38 && (w & OFPFW_DL_DST || !memcmp(a->dl_dst, b->dl_dst, ETH_ADDR_LEN))
39 && (w & OFPFW_DL_TYPE || a->dl_type == b->dl_type)
40 && (w & OFPFW_NW_SRC || a->nw_src == b->nw_src)
41 && (w & OFPFW_NW_DST || a->nw_dst == b->nw_dst)
42 && (w & OFPFW_NW_PROTO || a->nw_proto == b->nw_proto)
43 && (w & OFPFW_TP_SRC || a->tp_src == b->tp_src)
44 && (w & OFPFW_TP_DST || a->tp_dst == b->tp_dst));
47 /* Returns nonzero if 'a' and 'b' match, that is, if their fields are equal
48 * modulo wildcards, zero otherwise. */
50 int flow_matches(const struct sw_flow_key *a, const struct sw_flow_key *b)
52 return flow_fields_match(&a->flow, &b->flow, a->wildcards | b->wildcards);
55 /* Returns nonzero if 't' (the table entry's key) and 'd' (the key
56 * describing the deletion) match, that is, if their fields are
57 * equal modulo wildcards, zero otherwise. If 'strict' is nonzero, the
58 * wildcards must match in both 't_key' and 'd_key'. Note that the
59 * table's wildcards are ignored unless 'strict' is set. */
61 int flow_del_matches(const struct sw_flow_key *t, const struct sw_flow_key *d, int strict)
63 if (strict && t->wildcards != d->wildcards)
66 return flow_fields_match(&t->flow, &d->flow, d->wildcards);
69 void flow_extract_match(struct sw_flow_key* to, const struct ofp_match* from)
71 to->wildcards = ntohs(from->wildcards) & OFPFW_ALL;
72 to->flow.in_port = from->in_port;
73 to->flow.dl_vlan = from->dl_vlan;
74 memcpy(to->flow.dl_src, from->dl_src, ETH_ADDR_LEN);
75 memcpy(to->flow.dl_dst, from->dl_dst, ETH_ADDR_LEN);
76 to->flow.dl_type = from->dl_type;
77 to->flow.nw_src = from->nw_src;
78 to->flow.nw_dst = from->nw_dst;
79 to->flow.nw_proto = from->nw_proto;
80 to->flow.tp_src = from->tp_src;
81 to->flow.tp_dst = from->tp_dst;
82 to->flow.reserved = 0;
85 void flow_fill_match(struct ofp_match* to, const struct sw_flow_key* from)
87 to->wildcards = htons(from->wildcards);
88 to->in_port = from->flow.in_port;
89 to->dl_vlan = from->flow.dl_vlan;
90 memcpy(to->dl_src, from->flow.dl_src, ETH_ADDR_LEN);
91 memcpy(to->dl_dst, from->flow.dl_dst, ETH_ADDR_LEN);
92 to->dl_type = from->flow.dl_type;
93 to->nw_src = from->flow.nw_src;
94 to->nw_dst = from->flow.nw_dst;
95 to->nw_proto = from->flow.nw_proto;
96 to->tp_src = from->flow.tp_src;
97 to->tp_dst = from->flow.tp_dst;
98 memset(to->pad, '\0', sizeof(to->pad));
101 /* Allocates and returns a new flow with 'n_actions' action, using allocation
102 * flags 'flags'. Returns the new flow or a null pointer on failure. */
103 struct sw_flow *flow_alloc(int n_actions)
105 struct sw_flow *flow = malloc(sizeof *flow);
109 flow->n_actions = n_actions;
110 flow->actions = malloc(n_actions * sizeof *flow->actions);
111 if (!flow->actions && n_actions > 0) {
118 /* Frees 'flow' immediately. */
119 void flow_free(struct sw_flow *flow)
128 /* Prints a representation of 'key' to the kernel log. */
129 void print_flow(const struct sw_flow_key *key)
131 const struct flow *f = &key->flow;
132 printf("wild%04x port%04x:vlan%04x mac%02x:%02x:%02x:%02x:%02x:%02x"
133 "->%02x:%02x:%02x:%02x:%02x:%02x "
134 "proto%04x ip%u.%u.%u.%u->%u.%u.%u.%u port%d->%d\n",
135 key->wildcards, ntohs(f->in_port), ntohs(f->dl_vlan),
136 f->dl_src[0], f->dl_src[1], f->dl_src[2],
137 f->dl_src[3], f->dl_src[4], f->dl_src[5],
138 f->dl_dst[0], f->dl_dst[1], f->dl_dst[2],
139 f->dl_dst[3], f->dl_dst[4], f->dl_dst[5],
141 ((unsigned char *)&f->nw_src)[0],
142 ((unsigned char *)&f->nw_src)[1],
143 ((unsigned char *)&f->nw_src)[2],
144 ((unsigned char *)&f->nw_src)[3],
145 ((unsigned char *)&f->nw_dst)[0],
146 ((unsigned char *)&f->nw_dst)[1],
147 ((unsigned char *)&f->nw_dst)[2],
148 ((unsigned char *)&f->nw_dst)[3],
149 ntohs(f->tp_src), ntohs(f->tp_dst));
152 int flow_timeout(struct sw_flow *flow)
154 if (flow->max_idle == OFP_FLOW_PERMANENT)
158 return time(0) > flow->timeout;
161 void flow_used(struct sw_flow *flow, struct buffer *buffer)
163 if (flow->max_idle != OFP_FLOW_PERMANENT)
164 flow->timeout = time(0) + flow->max_idle;
166 flow->packet_count++;
167 flow->byte_count += buffer->size;